Merge tag 'nvme-5.13-2021-05-05' of git://git.infradead.org/nvme into block-5.13
[linux-2.6-microblaze.git] / drivers / scsi / pmcraid.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
4  *
5  * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
6  *             PMC-Sierra Inc
7  *
8  * Copyright (C) 2008, 2009 PMC Sierra Inc
9  */
10 #include <linux/fs.h>
11 #include <linux/init.h>
12 #include <linux/types.h>
13 #include <linux/errno.h>
14 #include <linux/kernel.h>
15 #include <linux/ioport.h>
16 #include <linux/delay.h>
17 #include <linux/pci.h>
18 #include <linux/wait.h>
19 #include <linux/spinlock.h>
20 #include <linux/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/blkdev.h>
23 #include <linux/firmware.h>
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/hdreg.h>
27 #include <linux/io.h>
28 #include <linux/slab.h>
29 #include <asm/irq.h>
30 #include <asm/processor.h>
31 #include <linux/libata.h>
32 #include <linux/mutex.h>
33 #include <linux/ktime.h>
34 #include <scsi/scsi.h>
35 #include <scsi/scsi_host.h>
36 #include <scsi/scsi_device.h>
37 #include <scsi/scsi_tcq.h>
38 #include <scsi/scsi_eh.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsicam.h>
41
42 #include "pmcraid.h"
43
44 /*
45  *   Module configuration parameters
46  */
47 static unsigned int pmcraid_debug_log;
48 static unsigned int pmcraid_disable_aen;
49 static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
50 static unsigned int pmcraid_enable_msix;
51
52 /*
53  * Data structures to support multiple adapters by the LLD.
54  * pmcraid_adapter_count - count of configured adapters
55  */
56 static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
57
58 /*
59  * Supporting user-level control interface through IOCTL commands.
60  * pmcraid_major - major number to use
61  * pmcraid_minor - minor number(s) to use
62  */
63 static unsigned int pmcraid_major;
64 static struct class *pmcraid_class;
65 static DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
66
67 /*
68  * Module parameters
69  */
70 MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
71 MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
72 MODULE_LICENSE("GPL");
73 MODULE_VERSION(PMCRAID_DRIVER_VERSION);
74
75 module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
76 MODULE_PARM_DESC(log_level,
77                  "Enables firmware error code logging, default :1 high-severity"
78                  " errors, 2: all errors including high-severity errors,"
79                  " 0: disables logging");
80
81 module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
82 MODULE_PARM_DESC(debug,
83                  "Enable driver verbose message logging. Set 1 to enable."
84                  "(default: 0)");
85
86 module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
87 MODULE_PARM_DESC(disable_aen,
88                  "Disable driver aen notifications to apps. Set 1 to disable."
89                  "(default: 0)");
90
91 /* chip specific constants for PMC MaxRAID controllers (same for
92  * 0x5220 and 0x8010
93  */
94 static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
95         {
96          .ioastatus = 0x0,
97          .ioarrin = 0x00040,
98          .mailbox = 0x7FC30,
99          .global_intr_mask = 0x00034,
100          .ioa_host_intr = 0x0009C,
101          .ioa_host_intr_clr = 0x000A0,
102          .ioa_host_msix_intr = 0x7FC40,
103          .ioa_host_mask = 0x7FC28,
104          .ioa_host_mask_clr = 0x7FC28,
105          .host_ioa_intr = 0x00020,
106          .host_ioa_intr_clr = 0x00020,
107          .transop_timeout = 300
108          }
109 };
110
111 /*
112  * PCI device ids supported by pmcraid driver
113  */
114 static struct pci_device_id pmcraid_pci_table[] = {
115         { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
116           0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
117         },
118         {}
119 };
120
121 MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
122
123
124
125 /**
126  * pmcraid_slave_alloc - Prepare for commands to a device
127  * @scsi_dev: scsi device struct
128  *
129  * This function is called by mid-layer prior to sending any command to the new
130  * device. Stores resource entry details of the device in scsi_device struct.
131  * Queuecommand uses the resource handle and other details to fill up IOARCB
132  * while sending commands to the device.
133  *
134  * Return value:
135  *        0 on success / -ENXIO if device does not exist
136  */
137 static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
138 {
139         struct pmcraid_resource_entry *temp, *res = NULL;
140         struct pmcraid_instance *pinstance;
141         u8 target, bus, lun;
142         unsigned long lock_flags;
143         int rc = -ENXIO;
144         u16 fw_version;
145
146         pinstance = shost_priv(scsi_dev->host);
147
148         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
149
150         /* Driver exposes VSET and GSCSI resources only; all other device types
151          * are not exposed. Resource list is synchronized using resource lock
152          * so any traversal or modifications to the list should be done inside
153          * this lock
154          */
155         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
156         list_for_each_entry(temp, &pinstance->used_res_q, queue) {
157
158                 /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
159                 if (RES_IS_VSET(temp->cfg_entry)) {
160                         if (fw_version <= PMCRAID_FW_VERSION_1)
161                                 target = temp->cfg_entry.unique_flags1;
162                         else
163                                 target = le16_to_cpu(temp->cfg_entry.array_id) & 0xFF;
164
165                         if (target > PMCRAID_MAX_VSET_TARGETS)
166                                 continue;
167                         bus = PMCRAID_VSET_BUS_ID;
168                         lun = 0;
169                 } else if (RES_IS_GSCSI(temp->cfg_entry)) {
170                         target = RES_TARGET(temp->cfg_entry.resource_address);
171                         bus = PMCRAID_PHYS_BUS_ID;
172                         lun = RES_LUN(temp->cfg_entry.resource_address);
173                 } else {
174                         continue;
175                 }
176
177                 if (bus == scsi_dev->channel &&
178                     target == scsi_dev->id &&
179                     lun == scsi_dev->lun) {
180                         res = temp;
181                         break;
182                 }
183         }
184
185         if (res) {
186                 res->scsi_dev = scsi_dev;
187                 scsi_dev->hostdata = res;
188                 res->change_detected = 0;
189                 atomic_set(&res->read_failures, 0);
190                 atomic_set(&res->write_failures, 0);
191                 rc = 0;
192         }
193         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
194         return rc;
195 }
196
197 /**
198  * pmcraid_slave_configure - Configures a SCSI device
199  * @scsi_dev: scsi device struct
200  *
201  * This function is executed by SCSI mid layer just after a device is first
202  * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
203  * timeout value (default 30s) will be over-written to a higher value (60s)
204  * and max_sectors value will be over-written to 512. It also sets queue depth
205  * to host->cmd_per_lun value
206  *
207  * Return value:
208  *        0 on success
209  */
210 static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
211 {
212         struct pmcraid_resource_entry *res = scsi_dev->hostdata;
213
214         if (!res)
215                 return 0;
216
217         /* LLD exposes VSETs and Enclosure devices only */
218         if (RES_IS_GSCSI(res->cfg_entry) &&
219             scsi_dev->type != TYPE_ENCLOSURE)
220                 return -ENXIO;
221
222         pmcraid_info("configuring %x:%x:%x:%x\n",
223                      scsi_dev->host->unique_id,
224                      scsi_dev->channel,
225                      scsi_dev->id,
226                      (u8)scsi_dev->lun);
227
228         if (RES_IS_GSCSI(res->cfg_entry)) {
229                 scsi_dev->allow_restart = 1;
230         } else if (RES_IS_VSET(res->cfg_entry)) {
231                 scsi_dev->allow_restart = 1;
232                 blk_queue_rq_timeout(scsi_dev->request_queue,
233                                      PMCRAID_VSET_IO_TIMEOUT);
234                 blk_queue_max_hw_sectors(scsi_dev->request_queue,
235                                       PMCRAID_VSET_MAX_SECTORS);
236         }
237
238         /*
239          * We never want to report TCQ support for these types of devices.
240          */
241         if (!RES_IS_GSCSI(res->cfg_entry) && !RES_IS_VSET(res->cfg_entry))
242                 scsi_dev->tagged_supported = 0;
243
244         return 0;
245 }
246
247 /**
248  * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
249  *
250  * @scsi_dev: scsi device struct
251  *
252  * This is called by mid-layer before removing a device. Pointer assignments
253  * done in pmcraid_slave_alloc will be reset to NULL here.
254  *
255  * Return value
256  *   none
257  */
258 static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
259 {
260         struct pmcraid_resource_entry *res;
261
262         res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
263
264         if (res)
265                 res->scsi_dev = NULL;
266
267         scsi_dev->hostdata = NULL;
268 }
269
270 /**
271  * pmcraid_change_queue_depth - Change the device's queue depth
272  * @scsi_dev: scsi device struct
273  * @depth: depth to set
274  *
275  * Return value
276  *      actual depth set
277  */
278 static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth)
279 {
280         if (depth > PMCRAID_MAX_CMD_PER_LUN)
281                 depth = PMCRAID_MAX_CMD_PER_LUN;
282         return scsi_change_queue_depth(scsi_dev, depth);
283 }
284
285 /**
286  * pmcraid_init_cmdblk - initializes a command block
287  *
288  * @cmd: pointer to struct pmcraid_cmd to be initialized
289  * @index: if >=0 first time initialization; otherwise reinitialization
290  *
291  * Return Value
292  *       None
293  */
294 static void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
295 {
296         struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
297         dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
298
299         if (index >= 0) {
300                 /* first time initialization (called from  probe) */
301                 u32 ioasa_offset =
302                         offsetof(struct pmcraid_control_block, ioasa);
303
304                 cmd->index = index;
305                 ioarcb->response_handle = cpu_to_le32(index << 2);
306                 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
307                 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
308                 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
309         } else {
310                 /* re-initialization of various lengths, called once command is
311                  * processed by IOA
312                  */
313                 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
314                 ioarcb->hrrq_id = 0;
315                 ioarcb->request_flags0 = 0;
316                 ioarcb->request_flags1 = 0;
317                 ioarcb->cmd_timeout = 0;
318                 ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
319                 ioarcb->ioadl_bus_addr = 0;
320                 ioarcb->ioadl_length = 0;
321                 ioarcb->data_transfer_length = 0;
322                 ioarcb->add_cmd_param_length = 0;
323                 ioarcb->add_cmd_param_offset = 0;
324                 cmd->ioa_cb->ioasa.ioasc = 0;
325                 cmd->ioa_cb->ioasa.residual_data_length = 0;
326                 cmd->time_left = 0;
327         }
328
329         cmd->cmd_done = NULL;
330         cmd->scsi_cmd = NULL;
331         cmd->release = 0;
332         cmd->completion_req = 0;
333         cmd->sense_buffer = NULL;
334         cmd->sense_buffer_dma = 0;
335         cmd->dma_handle = 0;
336         timer_setup(&cmd->timer, NULL, 0);
337 }
338
339 /**
340  * pmcraid_reinit_cmdblk - reinitialize a command block
341  *
342  * @cmd: pointer to struct pmcraid_cmd to be reinitialized
343  *
344  * Return Value
345  *       None
346  */
347 static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
348 {
349         pmcraid_init_cmdblk(cmd, -1);
350 }
351
352 /**
353  * pmcraid_get_free_cmd - get a free cmd block from command block pool
354  * @pinstance: adapter instance structure
355  *
356  * Return Value:
357  *      returns pointer to cmd block or NULL if no blocks are available
358  */
359 static struct pmcraid_cmd *pmcraid_get_free_cmd(
360         struct pmcraid_instance *pinstance
361 )
362 {
363         struct pmcraid_cmd *cmd = NULL;
364         unsigned long lock_flags;
365
366         /* free cmd block list is protected by free_pool_lock */
367         spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
368
369         if (!list_empty(&pinstance->free_cmd_pool)) {
370                 cmd = list_entry(pinstance->free_cmd_pool.next,
371                                  struct pmcraid_cmd, free_list);
372                 list_del(&cmd->free_list);
373         }
374         spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
375
376         /* Initialize the command block before giving it the caller */
377         if (cmd != NULL)
378                 pmcraid_reinit_cmdblk(cmd);
379         return cmd;
380 }
381
382 /**
383  * pmcraid_return_cmd - return a completed command block back into free pool
384  * @cmd: pointer to the command block
385  *
386  * Return Value:
387  *      nothing
388  */
389 static void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
390 {
391         struct pmcraid_instance *pinstance = cmd->drv_inst;
392         unsigned long lock_flags;
393
394         spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
395         list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
396         spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
397 }
398
399 /**
400  * pmcraid_read_interrupts -  reads IOA interrupts
401  *
402  * @pinstance: pointer to adapter instance structure
403  *
404  * Return value
405  *       interrupts read from IOA
406  */
407 static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
408 {
409         return (pinstance->interrupt_mode) ?
410                 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
411                 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
412 }
413
414 /**
415  * pmcraid_disable_interrupts - Masks and clears all specified interrupts
416  *
417  * @pinstance: pointer to per adapter instance structure
418  * @intrs: interrupts to disable
419  *
420  * Return Value
421  *       None
422  */
423 static void pmcraid_disable_interrupts(
424         struct pmcraid_instance *pinstance,
425         u32 intrs
426 )
427 {
428         u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
429         u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
430
431         iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
432         iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
433         ioread32(pinstance->int_regs.global_interrupt_mask_reg);
434
435         if (!pinstance->interrupt_mode) {
436                 iowrite32(intrs,
437                         pinstance->int_regs.ioa_host_interrupt_mask_reg);
438                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
439         }
440 }
441
442 /**
443  * pmcraid_enable_interrupts - Enables specified interrupts
444  *
445  * @pinstance: pointer to per adapter instance structure
446  * @intrs: interrupts to enable
447  *
448  * Return Value
449  *       None
450  */
451 static void pmcraid_enable_interrupts(
452         struct pmcraid_instance *pinstance,
453         u32 intrs)
454 {
455         u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
456         u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
457
458         iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
459
460         if (!pinstance->interrupt_mode) {
461                 iowrite32(~intrs,
462                          pinstance->int_regs.ioa_host_interrupt_mask_reg);
463                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
464         }
465
466         pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
467                 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
468                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
469 }
470
471 /**
472  * pmcraid_clr_trans_op - clear trans to op interrupt
473  *
474  * @pinstance: pointer to per adapter instance structure
475  *
476  * Return Value
477  *       None
478  */
479 static void pmcraid_clr_trans_op(
480         struct pmcraid_instance *pinstance
481 )
482 {
483         unsigned long lock_flags;
484
485         if (!pinstance->interrupt_mode) {
486                 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
487                         pinstance->int_regs.ioa_host_interrupt_mask_reg);
488                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
489                 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
490                         pinstance->int_regs.ioa_host_interrupt_clr_reg);
491                 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
492         }
493
494         if (pinstance->reset_cmd != NULL) {
495                 del_timer(&pinstance->reset_cmd->timer);
496                 spin_lock_irqsave(
497                         pinstance->host->host_lock, lock_flags);
498                 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
499                 spin_unlock_irqrestore(
500                         pinstance->host->host_lock, lock_flags);
501         }
502 }
503
504 /**
505  * pmcraid_reset_type - Determine the required reset type
506  * @pinstance: pointer to adapter instance structure
507  *
508  * IOA requires hard reset if any of the following conditions is true.
509  * 1. If HRRQ valid interrupt is not masked
510  * 2. IOA reset alert doorbell is set
511  * 3. If there are any error interrupts
512  */
513 static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
514 {
515         u32 mask;
516         u32 intrs;
517         u32 alerts;
518
519         mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
520         intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
521         alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
522
523         if ((mask & INTRS_HRRQ_VALID) == 0 ||
524             (alerts & DOORBELL_IOA_RESET_ALERT) ||
525             (intrs & PMCRAID_ERROR_INTERRUPTS)) {
526                 pmcraid_info("IOA requires hard reset\n");
527                 pinstance->ioa_hard_reset = 1;
528         }
529
530         /* If unit check is active, trigger the dump */
531         if (intrs & INTRS_IOA_UNIT_CHECK)
532                 pinstance->ioa_unit_check = 1;
533 }
534
535 static void pmcraid_ioa_reset(struct pmcraid_cmd *);
536 /**
537  * pmcraid_bist_done - completion function for PCI BIST
538  * @t: pointer to reset command
539  * Return Value
540  *      none
541  */
542 static void pmcraid_bist_done(struct timer_list *t)
543 {
544         struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
545         struct pmcraid_instance *pinstance = cmd->drv_inst;
546         unsigned long lock_flags;
547         int rc;
548         u16 pci_reg;
549
550         rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
551
552         /* If PCI config space can't be accessed wait for another two secs */
553         if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
554             cmd->time_left > 0) {
555                 pmcraid_info("BIST not complete, waiting another 2 secs\n");
556                 cmd->timer.expires = jiffies + cmd->time_left;
557                 cmd->time_left = 0;
558                 add_timer(&cmd->timer);
559         } else {
560                 cmd->time_left = 0;
561                 pmcraid_info("BIST is complete, proceeding with reset\n");
562                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
563                 pmcraid_ioa_reset(cmd);
564                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
565         }
566 }
567
568 /**
569  * pmcraid_start_bist - starts BIST
570  * @cmd: pointer to reset cmd
571  * Return Value
572  *   none
573  */
574 static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
575 {
576         struct pmcraid_instance *pinstance = cmd->drv_inst;
577         u32 doorbells, intrs;
578
579         /* proceed with bist and wait for 2 seconds */
580         iowrite32(DOORBELL_IOA_START_BIST,
581                 pinstance->int_regs.host_ioa_interrupt_reg);
582         doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
583         intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
584         pmcraid_info("doorbells after start bist: %x intrs: %x\n",
585                       doorbells, intrs);
586
587         cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
588         cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
589         cmd->timer.function = pmcraid_bist_done;
590         add_timer(&cmd->timer);
591 }
592
593 /**
594  * pmcraid_reset_alert_done - completion routine for reset_alert
595  * @t: pointer to command block used in reset sequence
596  * Return value
597  *  None
598  */
599 static void pmcraid_reset_alert_done(struct timer_list *t)
600 {
601         struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
602         struct pmcraid_instance *pinstance = cmd->drv_inst;
603         u32 status = ioread32(pinstance->ioa_status);
604         unsigned long lock_flags;
605
606         /* if the critical operation in progress bit is set or the wait times
607          * out, invoke reset engine to proceed with hard reset. If there is
608          * some more time to wait, restart the timer
609          */
610         if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
611             cmd->time_left <= 0) {
612                 pmcraid_info("critical op is reset proceeding with reset\n");
613                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
614                 pmcraid_ioa_reset(cmd);
615                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
616         } else {
617                 pmcraid_info("critical op is not yet reset waiting again\n");
618                 /* restart timer if some more time is available to wait */
619                 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
620                 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
621                 cmd->timer.function = pmcraid_reset_alert_done;
622                 add_timer(&cmd->timer);
623         }
624 }
625
626 static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
627 /**
628  * pmcraid_reset_alert - alerts IOA for a possible reset
629  * @cmd: command block to be used for reset sequence.
630  *
631  * Return Value
632  *      returns 0 if pci config-space is accessible and RESET_DOORBELL is
633  *      successfully written to IOA. Returns non-zero in case pci_config_space
634  *      is not accessible
635  */
636 static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
637 {
638         struct pmcraid_instance *pinstance = cmd->drv_inst;
639         u32 doorbells;
640         int rc;
641         u16 pci_reg;
642
643         /* If we are able to access IOA PCI config space, alert IOA that we are
644          * going to reset it soon. This enables IOA to preserv persistent error
645          * data if any. In case memory space is not accessible, proceed with
646          * BIST or slot_reset
647          */
648         rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
649         if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
650
651                 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
652                  * reset IOA doesn't generate any interrupts when CRITICAL
653                  * OPERATION bit is reset. A timer is started to wait for this
654                  * bit to be reset.
655                  */
656                 cmd->time_left = PMCRAID_RESET_TIMEOUT;
657                 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
658                 cmd->timer.function = pmcraid_reset_alert_done;
659                 add_timer(&cmd->timer);
660
661                 iowrite32(DOORBELL_IOA_RESET_ALERT,
662                         pinstance->int_regs.host_ioa_interrupt_reg);
663                 doorbells =
664                         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
665                 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
666         } else {
667                 pmcraid_info("PCI config is not accessible starting BIST\n");
668                 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
669                 pmcraid_start_bist(cmd);
670         }
671 }
672
673 /**
674  * pmcraid_timeout_handler -  Timeout handler for internally generated ops
675  *
676  * @t: pointer to command structure, that got timedout
677  *
678  * This function blocks host requests and initiates an adapter reset.
679  *
680  * Return value:
681  *   None
682  */
683 static void pmcraid_timeout_handler(struct timer_list *t)
684 {
685         struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
686         struct pmcraid_instance *pinstance = cmd->drv_inst;
687         unsigned long lock_flags;
688
689         dev_info(&pinstance->pdev->dev,
690                 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
691                 cmd->ioa_cb->ioarcb.cdb[0]);
692
693         /* Command timeouts result in hard reset sequence. The command that got
694          * timed out may be the one used as part of reset sequence. In this
695          * case restart reset sequence using the same command block even if
696          * reset is in progress. Otherwise fail this command and get a free
697          * command block to restart the reset sequence.
698          */
699         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
700         if (!pinstance->ioa_reset_in_progress) {
701                 pinstance->ioa_reset_attempts = 0;
702                 cmd = pmcraid_get_free_cmd(pinstance);
703
704                 /* If we are out of command blocks, just return here itself.
705                  * Some other command's timeout handler can do the reset job
706                  */
707                 if (cmd == NULL) {
708                         spin_unlock_irqrestore(pinstance->host->host_lock,
709                                                lock_flags);
710                         pmcraid_err("no free cmnd block for timeout handler\n");
711                         return;
712                 }
713
714                 pinstance->reset_cmd = cmd;
715                 pinstance->ioa_reset_in_progress = 1;
716         } else {
717                 pmcraid_info("reset is already in progress\n");
718
719                 if (pinstance->reset_cmd != cmd) {
720                         /* This command should have been given to IOA, this
721                          * command will be completed by fail_outstanding_cmds
722                          * anyway
723                          */
724                         pmcraid_err("cmd is pending but reset in progress\n");
725                 }
726
727                 /* If this command was being used as part of the reset
728                  * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
729                  * causes fail_outstanding_commands not to return the command
730                  * block back to free pool
731                  */
732                 if (cmd == pinstance->reset_cmd)
733                         cmd->cmd_done = pmcraid_ioa_reset;
734         }
735
736         /* Notify apps of important IOA bringup/bringdown sequences */
737         if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
738             pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
739                 pmcraid_notify_ioastate(pinstance,
740                                         PMC_DEVICE_EVENT_RESET_START);
741
742         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
743         scsi_block_requests(pinstance->host);
744         pmcraid_reset_alert(cmd);
745         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
746 }
747
748 /**
749  * pmcraid_internal_done - completion routine for internally generated cmds
750  *
751  * @cmd: command that got response from IOA
752  *
753  * Return Value:
754  *       none
755  */
756 static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
757 {
758         pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
759                      cmd->ioa_cb->ioarcb.cdb[0],
760                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
761
762         /* Some of the internal commands are sent with callers blocking for the
763          * response. Same will be indicated as part of cmd->completion_req
764          * field. Response path needs to wake up any waiters waiting for cmd
765          * completion if this flag is set.
766          */
767         if (cmd->completion_req) {
768                 cmd->completion_req = 0;
769                 complete(&cmd->wait_for_completion);
770         }
771
772         /* most of the internal commands are completed by caller itself, so
773          * no need to return the command block back to free pool until we are
774          * required to do so (e.g once done with initialization).
775          */
776         if (cmd->release) {
777                 cmd->release = 0;
778                 pmcraid_return_cmd(cmd);
779         }
780 }
781
782 /**
783  * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
784  *
785  * @cmd: command that got response from IOA
786  *
787  * This routine is called after driver re-reads configuration table due to a
788  * lost CCN. It returns the command block back to free pool and schedules
789  * worker thread to add/delete devices into the system.
790  *
791  * Return Value:
792  *       none
793  */
794 static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
795 {
796         pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
797                      cmd->ioa_cb->ioarcb.cdb[0],
798                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
799
800         if (cmd->release) {
801                 cmd->release = 0;
802                 pmcraid_return_cmd(cmd);
803         }
804         pmcraid_info("scheduling worker for config table reinitialization\n");
805         schedule_work(&cmd->drv_inst->worker_q);
806 }
807
808 /**
809  * pmcraid_erp_done - Process completion of SCSI error response from device
810  * @cmd: pmcraid_command
811  *
812  * This function copies the sense buffer into the scsi_cmd struct and completes
813  * scsi_cmd by calling scsi_done function.
814  *
815  * Return value:
816  *  none
817  */
818 static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
819 {
820         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
821         struct pmcraid_instance *pinstance = cmd->drv_inst;
822         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
823
824         if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
825                 scsi_cmd->result |= (DID_ERROR << 16);
826                 scmd_printk(KERN_INFO, scsi_cmd,
827                             "command CDB[0] = %x failed with IOASC: 0x%08X\n",
828                             cmd->ioa_cb->ioarcb.cdb[0], ioasc);
829         }
830
831         if (cmd->sense_buffer) {
832                 dma_unmap_single(&pinstance->pdev->dev, cmd->sense_buffer_dma,
833                                  SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
834                 cmd->sense_buffer = NULL;
835                 cmd->sense_buffer_dma = 0;
836         }
837
838         scsi_dma_unmap(scsi_cmd);
839         pmcraid_return_cmd(cmd);
840         scsi_cmd->scsi_done(scsi_cmd);
841 }
842
843 /**
844  * _pmcraid_fire_command - sends an IOA command to adapter
845  *
846  * This function adds the given block into pending command list
847  * and returns without waiting
848  *
849  * @cmd : command to be sent to the device
850  *
851  * Return Value
852  *      None
853  */
854 static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
855 {
856         struct pmcraid_instance *pinstance = cmd->drv_inst;
857         unsigned long lock_flags;
858
859         /* Add this command block to pending cmd pool. We do this prior to
860          * writting IOARCB to ioarrin because IOA might complete the command
861          * by the time we are about to add it to the list. Response handler
862          * (isr/tasklet) looks for cmd block in the pending pending list.
863          */
864         spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
865         list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
866         spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
867         atomic_inc(&pinstance->outstanding_cmds);
868
869         /* driver writes lower 32-bit value of IOARCB address only */
870         mb();
871         iowrite32(le64_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr), pinstance->ioarrin);
872 }
873
874 /**
875  * pmcraid_send_cmd - fires a command to IOA
876  *
877  * This function also sets up timeout function, and command completion
878  * function
879  *
880  * @cmd: pointer to the command block to be fired to IOA
881  * @cmd_done: command completion function, called once IOA responds
882  * @timeout: timeout to wait for this command completion
883  * @timeout_func: timeout handler
884  *
885  * Return value
886  *   none
887  */
888 static void pmcraid_send_cmd(
889         struct pmcraid_cmd *cmd,
890         void (*cmd_done) (struct pmcraid_cmd *),
891         unsigned long timeout,
892         void (*timeout_func) (struct timer_list *)
893 )
894 {
895         /* initialize done function */
896         cmd->cmd_done = cmd_done;
897
898         if (timeout_func) {
899                 /* setup timeout handler */
900                 cmd->timer.expires = jiffies + timeout;
901                 cmd->timer.function = timeout_func;
902                 add_timer(&cmd->timer);
903         }
904
905         /* fire the command to IOA */
906         _pmcraid_fire_command(cmd);
907 }
908
909 /**
910  * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
911  * @cmd: pointer to the command block used for sending IOA shutdown command
912  *
913  * Return value
914  *  None
915  */
916 static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
917 {
918         struct pmcraid_instance *pinstance = cmd->drv_inst;
919         unsigned long lock_flags;
920
921         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
922         pmcraid_ioa_reset(cmd);
923         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
924 }
925
926 /**
927  * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
928  *
929  * @cmd: pointer to the command block used as part of reset sequence
930  *
931  * Return Value
932  *  None
933  */
934 static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
935 {
936         pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
937                      cmd->ioa_cb->ioarcb.cdb[0],
938                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
939
940         /* Note that commands sent during reset require next command to be sent
941          * to IOA. Hence reinit the done function as well as timeout function
942          */
943         pmcraid_reinit_cmdblk(cmd);
944         cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
945         cmd->ioa_cb->ioarcb.resource_handle =
946                 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
947         cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
948         cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
949
950         /* fire shutdown command to hardware. */
951         pmcraid_info("firing normal shutdown command (%d) to IOA\n",
952                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
953
954         pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
955
956         pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
957                          PMCRAID_SHUTDOWN_TIMEOUT,
958                          pmcraid_timeout_handler);
959 }
960
961 static void pmcraid_querycfg(struct pmcraid_cmd *);
962 /**
963  * pmcraid_get_fwversion_done - completion function for get_fwversion
964  *
965  * @cmd: pointer to command block used to send INQUIRY command
966  *
967  * Return Value
968  *      none
969  */
970 static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
971 {
972         struct pmcraid_instance *pinstance = cmd->drv_inst;
973         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
974         unsigned long lock_flags;
975
976         /* configuration table entry size depends on firmware version. If fw
977          * version is not known, it is not possible to interpret IOA config
978          * table
979          */
980         if (ioasc) {
981                 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
982                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
983                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
984                 pmcraid_reset_alert(cmd);
985                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
986         } else  {
987                 pmcraid_querycfg(cmd);
988         }
989 }
990
991 /**
992  * pmcraid_get_fwversion - reads firmware version information
993  *
994  * @cmd: pointer to command block used to send INQUIRY command
995  *
996  * Return Value
997  *      none
998  */
999 static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1000 {
1001         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1002         struct pmcraid_ioadl_desc *ioadl;
1003         struct pmcraid_instance *pinstance = cmd->drv_inst;
1004         u16 data_size = sizeof(struct pmcraid_inquiry_data);
1005
1006         pmcraid_reinit_cmdblk(cmd);
1007         ioarcb->request_type = REQ_TYPE_SCSI;
1008         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1009         ioarcb->cdb[0] = INQUIRY;
1010         ioarcb->cdb[1] = 1;
1011         ioarcb->cdb[2] = 0xD0;
1012         ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1013         ioarcb->cdb[4] = data_size & 0xFF;
1014
1015         /* Since entire inquiry data it can be part of IOARCB itself
1016          */
1017         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1018                                         offsetof(struct pmcraid_ioarcb,
1019                                                 add_data.u.ioadl[0]));
1020         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1021         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
1022
1023         ioarcb->request_flags0 |= NO_LINK_DESCS;
1024         ioarcb->data_transfer_length = cpu_to_le32(data_size);
1025         ioadl = &(ioarcb->add_data.u.ioadl[0]);
1026         ioadl->flags = IOADL_FLAGS_LAST_DESC;
1027         ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1028         ioadl->data_len = cpu_to_le32(data_size);
1029
1030         pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1031                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1032 }
1033
1034 /**
1035  * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1036  * @cmd: pointer to command block to be used for identify hrrq
1037  *
1038  * Return Value
1039  *       none
1040  */
1041 static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1042 {
1043         struct pmcraid_instance *pinstance = cmd->drv_inst;
1044         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1045         int index = cmd->hrrq_index;
1046         __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1047         __be32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1048         void (*done_function)(struct pmcraid_cmd *);
1049
1050         pmcraid_reinit_cmdblk(cmd);
1051         cmd->hrrq_index = index + 1;
1052
1053         if (cmd->hrrq_index < pinstance->num_hrrq) {
1054                 done_function = pmcraid_identify_hrrq;
1055         } else {
1056                 cmd->hrrq_index = 0;
1057                 done_function = pmcraid_get_fwversion;
1058         }
1059
1060         /* Initialize ioarcb */
1061         ioarcb->request_type = REQ_TYPE_IOACMD;
1062         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1063
1064         /* initialize the hrrq number where IOA will respond to this command */
1065         ioarcb->hrrq_id = index;
1066         ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1067         ioarcb->cdb[1] = index;
1068
1069         /* IOA expects 64-bit pci address to be written in B.E format
1070          * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1071          */
1072         pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1073                      hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1074
1075         memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1076         memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1077
1078         /* Subsequent commands require HRRQ identification to be successful.
1079          * Note that this gets called even during reset from SCSI mid-layer
1080          * or tasklet
1081          */
1082         pmcraid_send_cmd(cmd, done_function,
1083                          PMCRAID_INTERNAL_TIMEOUT,
1084                          pmcraid_timeout_handler);
1085 }
1086
1087 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1088 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1089
1090 /**
1091  * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1092  *
1093  * @cmd: initialized command block pointer
1094  *
1095  * Return Value
1096  *   none
1097  */
1098 static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1099 {
1100         if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1101                 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1102         else
1103                 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1104
1105         pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1106 }
1107
1108 /**
1109  * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1110  *
1111  * @pinstance: pointer to adapter instance structure
1112  * @type: HCAM type
1113  *
1114  * Return Value
1115  *   pointer to initialized pmcraid_cmd structure or NULL
1116  */
1117 static struct pmcraid_cmd *pmcraid_init_hcam
1118 (
1119         struct pmcraid_instance *pinstance,
1120         u8 type
1121 )
1122 {
1123         struct pmcraid_cmd *cmd;
1124         struct pmcraid_ioarcb *ioarcb;
1125         struct pmcraid_ioadl_desc *ioadl;
1126         struct pmcraid_hostrcb *hcam;
1127         void (*cmd_done) (struct pmcraid_cmd *);
1128         dma_addr_t dma;
1129         int rcb_size;
1130
1131         cmd = pmcraid_get_free_cmd(pinstance);
1132
1133         if (!cmd) {
1134                 pmcraid_err("no free command blocks for hcam\n");
1135                 return cmd;
1136         }
1137
1138         if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1139                 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1140                 cmd_done = pmcraid_process_ccn;
1141                 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1142                 hcam = &pinstance->ccn;
1143         } else {
1144                 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1145                 cmd_done = pmcraid_process_ldn;
1146                 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1147                 hcam = &pinstance->ldn;
1148         }
1149
1150         /* initialize command pointer used for HCAM registration */
1151         hcam->cmd = cmd;
1152
1153         ioarcb = &cmd->ioa_cb->ioarcb;
1154         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1155                                         offsetof(struct pmcraid_ioarcb,
1156                                                 add_data.u.ioadl[0]));
1157         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1158         ioadl = ioarcb->add_data.u.ioadl;
1159
1160         /* Initialize ioarcb */
1161         ioarcb->request_type = REQ_TYPE_HCAM;
1162         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1163         ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1164         ioarcb->cdb[1] = type;
1165         ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1166         ioarcb->cdb[8] = (rcb_size) & 0xFF;
1167
1168         ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1169
1170         ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1171         ioadl[0].data_len = cpu_to_le32(rcb_size);
1172         ioadl[0].address = cpu_to_le64(dma);
1173
1174         cmd->cmd_done = cmd_done;
1175         return cmd;
1176 }
1177
1178 /**
1179  * pmcraid_send_hcam - Send an HCAM to IOA
1180  * @pinstance: ioa config struct
1181  * @type: HCAM type
1182  *
1183  * This function will send a Host Controlled Async command to IOA.
1184  *
1185  * Return value:
1186  *      none
1187  */
1188 static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1189 {
1190         struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1191         pmcraid_send_hcam_cmd(cmd);
1192 }
1193
1194
1195 /**
1196  * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1197  *
1198  * @cmd: pointer to cmd that is used as cancelling command
1199  * @cmd_to_cancel: pointer to the command that needs to be cancelled
1200  */
1201 static void pmcraid_prepare_cancel_cmd(
1202         struct pmcraid_cmd *cmd,
1203         struct pmcraid_cmd *cmd_to_cancel
1204 )
1205 {
1206         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1207         __be64 ioarcb_addr;
1208
1209         /* IOARCB address of the command to be cancelled is given in
1210          * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1211          * IOARCB address are not masked.
1212          */
1213         ioarcb_addr = cpu_to_be64(le64_to_cpu(cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr));
1214
1215         /* Get the resource handle to where the command to be aborted has been
1216          * sent.
1217          */
1218         ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1219         ioarcb->request_type = REQ_TYPE_IOACMD;
1220         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1221         ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1222
1223         memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1224 }
1225
1226 /**
1227  * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1228  *
1229  * @cmd: command to be used as cancelling command
1230  * @type: HCAM type
1231  * @cmd_done: op done function for the cancelling command
1232  */
1233 static void pmcraid_cancel_hcam(
1234         struct pmcraid_cmd *cmd,
1235         u8 type,
1236         void (*cmd_done) (struct pmcraid_cmd *)
1237 )
1238 {
1239         struct pmcraid_instance *pinstance;
1240         struct pmcraid_hostrcb  *hcam;
1241
1242         pinstance = cmd->drv_inst;
1243         hcam =  (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1244                 &pinstance->ldn : &pinstance->ccn;
1245
1246         /* prepare for cancelling previous hcam command. If the HCAM is
1247          * currently not pending with IOA, we would have hcam->cmd as non-null
1248          */
1249         if (hcam->cmd == NULL)
1250                 return;
1251
1252         pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1253
1254         /* writing to IOARRIN must be protected by host_lock, as mid-layer
1255          * schedule queuecommand while we are doing this
1256          */
1257         pmcraid_send_cmd(cmd, cmd_done,
1258                          PMCRAID_INTERNAL_TIMEOUT,
1259                          pmcraid_timeout_handler);
1260 }
1261
1262 /**
1263  * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1264  *
1265  * @cmd: command block to be used for cancelling the HCAM
1266  */
1267 static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1268 {
1269         pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1270                      cmd->ioa_cb->ioarcb.cdb[0],
1271                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1272
1273         pmcraid_reinit_cmdblk(cmd);
1274
1275         pmcraid_cancel_hcam(cmd,
1276                             PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1277                             pmcraid_ioa_shutdown);
1278 }
1279
1280 /**
1281  * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1282  *
1283  * @cmd: command block to be used for cancelling the HCAM
1284  */
1285 static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1286 {
1287         pmcraid_cancel_hcam(cmd,
1288                             PMCRAID_HCAM_CODE_LOG_DATA,
1289                             pmcraid_cancel_ccn);
1290 }
1291
1292 /**
1293  * pmcraid_expose_resource - check if the resource can be exposed to OS
1294  *
1295  * @fw_version: firmware version code
1296  * @cfgte: pointer to configuration table entry of the resource
1297  *
1298  * Return value:
1299  *      true if resource can be added to midlayer, false(0) otherwise
1300  */
1301 static int pmcraid_expose_resource(u16 fw_version,
1302                                    struct pmcraid_config_table_entry *cfgte)
1303 {
1304         int retval = 0;
1305
1306         if (cfgte->resource_type == RES_TYPE_VSET) {
1307                 if (fw_version <= PMCRAID_FW_VERSION_1)
1308                         retval = ((cfgte->unique_flags1 & 0x80) == 0);
1309                 else
1310                         retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1311                                   (cfgte->unique_flags1 & 0x80) == 0);
1312
1313         } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1314                 retval = (RES_BUS(cfgte->resource_address) !=
1315                                 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1316         return retval;
1317 }
1318
1319 /* attributes supported by pmcraid_event_family */
1320 enum {
1321         PMCRAID_AEN_ATTR_UNSPEC,
1322         PMCRAID_AEN_ATTR_EVENT,
1323         __PMCRAID_AEN_ATTR_MAX,
1324 };
1325 #define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1326
1327 /* commands supported by pmcraid_event_family */
1328 enum {
1329         PMCRAID_AEN_CMD_UNSPEC,
1330         PMCRAID_AEN_CMD_EVENT,
1331         __PMCRAID_AEN_CMD_MAX,
1332 };
1333 #define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1334
1335 static struct genl_multicast_group pmcraid_mcgrps[] = {
1336         { .name = "events", /* not really used - see ID discussion below */ },
1337 };
1338
1339 static struct genl_family pmcraid_event_family __ro_after_init = {
1340         .module = THIS_MODULE,
1341         .name = "pmcraid",
1342         .version = 1,
1343         .maxattr = PMCRAID_AEN_ATTR_MAX,
1344         .mcgrps = pmcraid_mcgrps,
1345         .n_mcgrps = ARRAY_SIZE(pmcraid_mcgrps),
1346 };
1347
1348 /**
1349  * pmcraid_netlink_init - registers pmcraid_event_family
1350  *
1351  * Return value:
1352  *      0 if the pmcraid_event_family is successfully registered
1353  *      with netlink generic, non-zero otherwise
1354  */
1355 static int __init pmcraid_netlink_init(void)
1356 {
1357         int result;
1358
1359         result = genl_register_family(&pmcraid_event_family);
1360
1361         if (result)
1362                 return result;
1363
1364         pmcraid_info("registered NETLINK GENERIC group: %d\n",
1365                      pmcraid_event_family.id);
1366
1367         return result;
1368 }
1369
1370 /**
1371  * pmcraid_netlink_release - unregisters pmcraid_event_family
1372  *
1373  * Return value:
1374  *      none
1375  */
1376 static void pmcraid_netlink_release(void)
1377 {
1378         genl_unregister_family(&pmcraid_event_family);
1379 }
1380
1381 /*
1382  * pmcraid_notify_aen - sends event msg to user space application
1383  * @pinstance: pointer to adapter instance structure
1384  *
1385  * Return value:
1386  *      0 if success, error value in case of any failure.
1387  */
1388 static int pmcraid_notify_aen(
1389         struct pmcraid_instance *pinstance,
1390         struct pmcraid_aen_msg  *aen_msg,
1391         u32    data_size)
1392 {
1393         struct sk_buff *skb;
1394         void *msg_header;
1395         u32  total_size, nla_genl_hdr_total_size;
1396         int result;
1397
1398         aen_msg->hostno = (pinstance->host->unique_id << 16 |
1399                            MINOR(pinstance->cdev.dev));
1400         aen_msg->length = data_size;
1401
1402         data_size += sizeof(*aen_msg);
1403
1404         total_size = nla_total_size(data_size);
1405         /* Add GENL_HDR to total_size */
1406         nla_genl_hdr_total_size =
1407                 (total_size + (GENL_HDRLEN +
1408                 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1409                  + NLMSG_HDRLEN);
1410         skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1411
1412
1413         if (!skb) {
1414                 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1415                              total_size);
1416                 return -ENOMEM;
1417         }
1418
1419         /* add the genetlink message header */
1420         msg_header = genlmsg_put(skb, 0, 0,
1421                                  &pmcraid_event_family, 0,
1422                                  PMCRAID_AEN_CMD_EVENT);
1423         if (!msg_header) {
1424                 pmcraid_err("failed to copy command details\n");
1425                 nlmsg_free(skb);
1426                 return -ENOMEM;
1427         }
1428
1429         result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1430
1431         if (result) {
1432                 pmcraid_err("failed to copy AEN attribute data\n");
1433                 nlmsg_free(skb);
1434                 return -EINVAL;
1435         }
1436
1437         /* send genetlink multicast message to notify appplications */
1438         genlmsg_end(skb, msg_header);
1439
1440         result = genlmsg_multicast(&pmcraid_event_family, skb,
1441                                    0, 0, GFP_ATOMIC);
1442
1443         /* If there are no listeners, genlmsg_multicast may return non-zero
1444          * value.
1445          */
1446         if (result)
1447                 pmcraid_info("error (%x) sending aen event message\n", result);
1448         return result;
1449 }
1450
1451 /**
1452  * pmcraid_notify_ccn - notifies about CCN event msg to user space
1453  * @pinstance: pointer adapter instance structure
1454  *
1455  * Return value:
1456  *      0 if success, error value in case of any failure
1457  */
1458 static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1459 {
1460         return pmcraid_notify_aen(pinstance,
1461                                 pinstance->ccn.msg,
1462                                 le32_to_cpu(pinstance->ccn.hcam->data_len) +
1463                                 sizeof(struct pmcraid_hcam_hdr));
1464 }
1465
1466 /**
1467  * pmcraid_notify_ldn - notifies about CCN event msg to user space
1468  * @pinstance: pointer adapter instance structure
1469  *
1470  * Return value:
1471  *      0 if success, error value in case of any failure
1472  */
1473 static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1474 {
1475         return pmcraid_notify_aen(pinstance,
1476                                 pinstance->ldn.msg,
1477                                 le32_to_cpu(pinstance->ldn.hcam->data_len) +
1478                                 sizeof(struct pmcraid_hcam_hdr));
1479 }
1480
1481 /**
1482  * pmcraid_notify_ioastate - sends IOA state event msg to user space
1483  * @pinstance: pointer adapter instance structure
1484  * @evt: controller state event to be sent
1485  *
1486  * Return value:
1487  *      0 if success, error value in case of any failure
1488  */
1489 static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1490 {
1491         pinstance->scn.ioa_state = evt;
1492         pmcraid_notify_aen(pinstance,
1493                           &pinstance->scn.msg,
1494                           sizeof(u32));
1495 }
1496
1497 /**
1498  * pmcraid_handle_config_change - Handle a config change from the adapter
1499  * @pinstance: pointer to per adapter instance structure
1500  *
1501  * Return value:
1502  *  none
1503  */
1504
1505 static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1506 {
1507         struct pmcraid_config_table_entry *cfg_entry;
1508         struct pmcraid_hcam_ccn *ccn_hcam;
1509         struct pmcraid_cmd *cmd;
1510         struct pmcraid_cmd *cfgcmd;
1511         struct pmcraid_resource_entry *res = NULL;
1512         unsigned long lock_flags;
1513         unsigned long host_lock_flags;
1514         u32 new_entry = 1;
1515         u32 hidden_entry = 0;
1516         u16 fw_version;
1517         int rc;
1518
1519         ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1520         cfg_entry = &ccn_hcam->cfg_entry;
1521         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1522
1523         pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1524                  res: %x:%x:%x:%x\n",
1525                  le32_to_cpu(pinstance->ccn.hcam->ilid),
1526                  pinstance->ccn.hcam->op_code,
1527                 (le32_to_cpu(pinstance->ccn.hcam->timestamp1) |
1528                 ((le32_to_cpu(pinstance->ccn.hcam->timestamp2) & 0xffffffffLL) << 32)),
1529                  pinstance->ccn.hcam->notification_type,
1530                  pinstance->ccn.hcam->notification_lost,
1531                  pinstance->ccn.hcam->flags,
1532                  pinstance->host->unique_id,
1533                  RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1534                  (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1535                         RES_BUS(cfg_entry->resource_address)),
1536                  RES_IS_VSET(*cfg_entry) ?
1537                         (fw_version <= PMCRAID_FW_VERSION_1 ?
1538                                 cfg_entry->unique_flags1 :
1539                                 le16_to_cpu(cfg_entry->array_id) & 0xFF) :
1540                         RES_TARGET(cfg_entry->resource_address),
1541                  RES_LUN(cfg_entry->resource_address));
1542
1543
1544         /* If this HCAM indicates a lost notification, read the config table */
1545         if (pinstance->ccn.hcam->notification_lost) {
1546                 cfgcmd = pmcraid_get_free_cmd(pinstance);
1547                 if (cfgcmd) {
1548                         pmcraid_info("lost CCN, reading config table\b");
1549                         pinstance->reinit_cfg_table = 1;
1550                         pmcraid_querycfg(cfgcmd);
1551                 } else {
1552                         pmcraid_err("lost CCN, no free cmd for querycfg\n");
1553                 }
1554                 goto out_notify_apps;
1555         }
1556
1557         /* If this resource is not going to be added to mid-layer, just notify
1558          * applications and return. If this notification is about hiding a VSET
1559          * resource, check if it was exposed already.
1560          */
1561         if (pinstance->ccn.hcam->notification_type ==
1562             NOTIFICATION_TYPE_ENTRY_CHANGED &&
1563             cfg_entry->resource_type == RES_TYPE_VSET) {
1564                 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1565         } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1566                 goto out_notify_apps;
1567         }
1568
1569         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1570         list_for_each_entry(res, &pinstance->used_res_q, queue) {
1571                 rc = memcmp(&res->cfg_entry.resource_address,
1572                             &cfg_entry->resource_address,
1573                             sizeof(cfg_entry->resource_address));
1574                 if (!rc) {
1575                         new_entry = 0;
1576                         break;
1577                 }
1578         }
1579
1580         if (new_entry) {
1581
1582                 if (hidden_entry) {
1583                         spin_unlock_irqrestore(&pinstance->resource_lock,
1584                                                 lock_flags);
1585                         goto out_notify_apps;
1586                 }
1587
1588                 /* If there are more number of resources than what driver can
1589                  * manage, do not notify the applications about the CCN. Just
1590                  * ignore this notifications and re-register the same HCAM
1591                  */
1592                 if (list_empty(&pinstance->free_res_q)) {
1593                         spin_unlock_irqrestore(&pinstance->resource_lock,
1594                                                 lock_flags);
1595                         pmcraid_err("too many resources attached\n");
1596                         spin_lock_irqsave(pinstance->host->host_lock,
1597                                           host_lock_flags);
1598                         pmcraid_send_hcam(pinstance,
1599                                           PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1600                         spin_unlock_irqrestore(pinstance->host->host_lock,
1601                                                host_lock_flags);
1602                         return;
1603                 }
1604
1605                 res = list_entry(pinstance->free_res_q.next,
1606                                  struct pmcraid_resource_entry, queue);
1607
1608                 list_del(&res->queue);
1609                 res->scsi_dev = NULL;
1610                 res->reset_progress = 0;
1611                 list_add_tail(&res->queue, &pinstance->used_res_q);
1612         }
1613
1614         memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1615
1616         if (pinstance->ccn.hcam->notification_type ==
1617             NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1618                 if (res->scsi_dev) {
1619                         if (fw_version <= PMCRAID_FW_VERSION_1)
1620                                 res->cfg_entry.unique_flags1 &= 0x7F;
1621                         else
1622                                 res->cfg_entry.array_id &= cpu_to_le16(0xFF);
1623                         res->change_detected = RES_CHANGE_DEL;
1624                         res->cfg_entry.resource_handle =
1625                                 PMCRAID_INVALID_RES_HANDLE;
1626                         schedule_work(&pinstance->worker_q);
1627                 } else {
1628                         /* This may be one of the non-exposed resources */
1629                         list_move_tail(&res->queue, &pinstance->free_res_q);
1630                 }
1631         } else if (!res->scsi_dev) {
1632                 res->change_detected = RES_CHANGE_ADD;
1633                 schedule_work(&pinstance->worker_q);
1634         }
1635         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1636
1637 out_notify_apps:
1638
1639         /* Notify configuration changes to registered applications.*/
1640         if (!pmcraid_disable_aen)
1641                 pmcraid_notify_ccn(pinstance);
1642
1643         cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1644         if (cmd)
1645                 pmcraid_send_hcam_cmd(cmd);
1646 }
1647
1648 /**
1649  * pmcraid_get_error_info - return error string for an ioasc
1650  * @ioasc: ioasc code
1651  * Return Value
1652  *       none
1653  */
1654 static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1655 {
1656         int i;
1657         for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1658                 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1659                         return &pmcraid_ioasc_error_table[i];
1660         }
1661         return NULL;
1662 }
1663
1664 /**
1665  * pmcraid_ioasc_logger - log IOASC information based user-settings
1666  * @ioasc: ioasc code
1667  * @cmd: pointer to command that resulted in 'ioasc'
1668  */
1669 static void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1670 {
1671         struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1672
1673         if (error_info == NULL ||
1674                 cmd->drv_inst->current_log_level < error_info->log_level)
1675                 return;
1676
1677         /* log the error string */
1678         pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1679                 cmd->ioa_cb->ioarcb.cdb[0],
1680                 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
1681                 ioasc, error_info->error_string);
1682 }
1683
1684 /**
1685  * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1686  *
1687  * @pinstance: pointer to per adapter instance structure
1688  *
1689  * Return value:
1690  *  none
1691  */
1692 static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1693 {
1694         struct pmcraid_hcam_ldn *hcam_ldn;
1695         u32 ioasc;
1696
1697         hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1698
1699         pmcraid_info
1700                 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1701                  pinstance->ldn.hcam->ilid,
1702                  pinstance->ldn.hcam->op_code,
1703                  pinstance->ldn.hcam->notification_type,
1704                  pinstance->ldn.hcam->notification_lost,
1705                  pinstance->ldn.hcam->flags,
1706                  pinstance->ldn.hcam->overlay_id);
1707
1708         /* log only the errors, no need to log informational log entries */
1709         if (pinstance->ldn.hcam->notification_type !=
1710             NOTIFICATION_TYPE_ERROR_LOG)
1711                 return;
1712
1713         if (pinstance->ldn.hcam->notification_lost ==
1714             HOSTRCB_NOTIFICATIONS_LOST)
1715                 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1716
1717         ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1718
1719         if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1720                 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1721                 dev_info(&pinstance->pdev->dev,
1722                         "UnitAttention due to IOA Bus Reset\n");
1723                 scsi_report_bus_reset(
1724                         pinstance->host,
1725                         RES_BUS(hcam_ldn->error_log.fd_ra));
1726         }
1727
1728         return;
1729 }
1730
1731 /**
1732  * pmcraid_process_ccn - Op done function for a CCN.
1733  * @cmd: pointer to command struct
1734  *
1735  * This function is the op done function for a configuration
1736  * change notification
1737  *
1738  * Return value:
1739  * none
1740  */
1741 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1742 {
1743         struct pmcraid_instance *pinstance = cmd->drv_inst;
1744         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1745         unsigned long lock_flags;
1746
1747         pinstance->ccn.cmd = NULL;
1748         pmcraid_return_cmd(cmd);
1749
1750         /* If driver initiated IOA reset happened while this hcam was pending
1751          * with IOA, or IOA bringdown sequence is in progress, no need to
1752          * re-register the hcam
1753          */
1754         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1755             atomic_read(&pinstance->ccn.ignore) == 1) {
1756                 return;
1757         } else if (ioasc) {
1758                 dev_info(&pinstance->pdev->dev,
1759                         "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1760                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1761                 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1762                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1763         } else {
1764                 pmcraid_handle_config_change(pinstance);
1765         }
1766 }
1767
1768 static void pmcraid_initiate_reset(struct pmcraid_instance *);
1769 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1770 /**
1771  * pmcraid_process_ldn - op done function for an LDN
1772  * @cmd: pointer to command block
1773  *
1774  * Return value
1775  *   none
1776  */
1777 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1778 {
1779         struct pmcraid_instance *pinstance = cmd->drv_inst;
1780         struct pmcraid_hcam_ldn *ldn_hcam =
1781                         (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1782         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1783         u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1784         unsigned long lock_flags;
1785
1786         /* return the command block back to freepool */
1787         pinstance->ldn.cmd = NULL;
1788         pmcraid_return_cmd(cmd);
1789
1790         /* If driver initiated IOA reset happened while this hcam was pending
1791          * with IOA, no need to re-register the hcam as reset engine will do it
1792          * once reset sequence is complete
1793          */
1794         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1795             atomic_read(&pinstance->ccn.ignore) == 1) {
1796                 return;
1797         } else if (!ioasc) {
1798                 pmcraid_handle_error_log(pinstance);
1799                 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1800                         spin_lock_irqsave(pinstance->host->host_lock,
1801                                           lock_flags);
1802                         pmcraid_initiate_reset(pinstance);
1803                         spin_unlock_irqrestore(pinstance->host->host_lock,
1804                                                lock_flags);
1805                         return;
1806                 }
1807                 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1808                         pinstance->timestamp_error = 1;
1809                         pmcraid_set_timestamp(cmd);
1810                 }
1811         } else {
1812                 dev_info(&pinstance->pdev->dev,
1813                         "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1814         }
1815         /* send netlink message for HCAM notification if enabled */
1816         if (!pmcraid_disable_aen)
1817                 pmcraid_notify_ldn(pinstance);
1818
1819         cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1820         if (cmd)
1821                 pmcraid_send_hcam_cmd(cmd);
1822 }
1823
1824 /**
1825  * pmcraid_register_hcams - register HCAMs for CCN and LDN
1826  *
1827  * @pinstance: pointer per adapter instance structure
1828  *
1829  * Return Value
1830  *   none
1831  */
1832 static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1833 {
1834         pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1835         pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1836 }
1837
1838 /**
1839  * pmcraid_unregister_hcams - cancel HCAMs registered already
1840  * @cmd: pointer to command used as part of reset sequence
1841  */
1842 static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1843 {
1844         struct pmcraid_instance *pinstance = cmd->drv_inst;
1845
1846         /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1847          * handling hcam response though it is not necessary. In order to
1848          * prevent this, set 'ignore', so that bring-down sequence doesn't
1849          * re-send any more hcams
1850          */
1851         atomic_set(&pinstance->ccn.ignore, 1);
1852         atomic_set(&pinstance->ldn.ignore, 1);
1853
1854         /* If adapter reset was forced as part of runtime reset sequence,
1855          * start the reset sequence. Reset will be triggered even in case
1856          * IOA unit_check.
1857          */
1858         if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1859              pinstance->ioa_unit_check) {
1860                 pinstance->force_ioa_reset = 0;
1861                 pinstance->ioa_unit_check = 0;
1862                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1863                 pmcraid_reset_alert(cmd);
1864                 return;
1865         }
1866
1867         /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1868          * one after the other. So CCN cancellation will be triggered by
1869          * pmcraid_cancel_ldn itself.
1870          */
1871         pmcraid_cancel_ldn(cmd);
1872 }
1873
1874 static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1875
1876 /**
1877  * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1878  * @pinstance: pointer to adapter instance structure
1879  * Return Value
1880  *  1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1881  */
1882 static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1883 {
1884         u32 intrs;
1885
1886         pmcraid_reinit_buffers(pinstance);
1887         intrs = pmcraid_read_interrupts(pinstance);
1888
1889         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1890
1891         if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1892                 if (!pinstance->interrupt_mode) {
1893                         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1894                                 pinstance->int_regs.
1895                                 ioa_host_interrupt_mask_reg);
1896                         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1897                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1898                 }
1899                 return 1;
1900         } else {
1901                 return 0;
1902         }
1903 }
1904
1905 /**
1906  * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1907  * @cmd : pointer to reset command block
1908  *
1909  * Return Value
1910  *      none
1911  */
1912 static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1913 {
1914         struct pmcraid_instance *pinstance = cmd->drv_inst;
1915         u32 int_reg;
1916         u32 doorbell;
1917
1918         /* There will be an interrupt when Transition to Operational bit is
1919          * set so tasklet would execute next reset task. The timeout handler
1920          * would re-initiate a reset
1921          */
1922         cmd->cmd_done = pmcraid_ioa_reset;
1923         cmd->timer.expires = jiffies +
1924                              msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
1925         cmd->timer.function = pmcraid_timeout_handler;
1926
1927         if (!timer_pending(&cmd->timer))
1928                 add_timer(&cmd->timer);
1929
1930         /* Enable destructive diagnostics on IOA if it is not yet in
1931          * operational state
1932          */
1933         doorbell = DOORBELL_RUNTIME_RESET |
1934                    DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
1935
1936         /* Since we do RESET_ALERT and Start BIST we have to again write
1937          * MSIX Doorbell to indicate the interrupt mode
1938          */
1939         if (pinstance->interrupt_mode) {
1940                 iowrite32(DOORBELL_INTR_MODE_MSIX,
1941                           pinstance->int_regs.host_ioa_interrupt_reg);
1942                 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
1943         }
1944
1945         iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
1946         ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1947         int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
1948
1949         pmcraid_info("Waiting for IOA to become operational %x:%x\n",
1950                      ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1951                      int_reg);
1952 }
1953
1954 /**
1955  * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
1956  *
1957  * @pinstance: pointer to adapter instance structure
1958  *
1959  * Return Value
1960  *      none
1961  */
1962 static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
1963 {
1964         pmcraid_info("%s is not yet implemented\n", __func__);
1965 }
1966
1967 /**
1968  * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
1969  * @pinstance: pointer to adapter instance structure
1970  *
1971  * This function fails all outstanding ops. If they are submitted to IOA
1972  * already, it sends cancel all messages if IOA is still accepting IOARCBs,
1973  * otherwise just completes the commands and returns the cmd blocks to free
1974  * pool.
1975  *
1976  * Return value:
1977  *       none
1978  */
1979 static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
1980 {
1981         struct pmcraid_cmd *cmd, *temp;
1982         unsigned long lock_flags;
1983
1984         /* pending command list is protected by pending_pool_lock. Its
1985          * traversal must be done as within this lock
1986          */
1987         spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
1988         list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
1989                                  free_list) {
1990                 list_del(&cmd->free_list);
1991                 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
1992                                         lock_flags);
1993                 cmd->ioa_cb->ioasa.ioasc =
1994                         cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
1995                 cmd->ioa_cb->ioasa.ilid =
1996                         cpu_to_le32(PMCRAID_DRIVER_ILID);
1997
1998                 /* In case the command timer is still running */
1999                 del_timer(&cmd->timer);
2000
2001                 /* If this is an IO command, complete it by invoking scsi_done
2002                  * function. If this is one of the internal commands other
2003                  * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2004                  * complete it
2005                  */
2006                 if (cmd->scsi_cmd) {
2007
2008                         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2009                         __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2010
2011                         scsi_cmd->result |= DID_ERROR << 16;
2012
2013                         scsi_dma_unmap(scsi_cmd);
2014                         pmcraid_return_cmd(cmd);
2015
2016                         pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2017                                      le32_to_cpu(resp) >> 2,
2018                                      cmd->ioa_cb->ioarcb.cdb[0],
2019                                      scsi_cmd->result);
2020                         scsi_cmd->scsi_done(scsi_cmd);
2021                 } else if (cmd->cmd_done == pmcraid_internal_done ||
2022                            cmd->cmd_done == pmcraid_erp_done) {
2023                         cmd->cmd_done(cmd);
2024                 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2025                            cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2026                         pmcraid_return_cmd(cmd);
2027                 }
2028
2029                 atomic_dec(&pinstance->outstanding_cmds);
2030                 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2031         }
2032
2033         spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2034 }
2035
2036 /**
2037  * pmcraid_ioa_reset - Implementation of IOA reset logic
2038  *
2039  * @cmd: pointer to the cmd block to be used for entire reset process
2040  *
2041  * This function executes most of the steps required for IOA reset. This gets
2042  * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2043  * 'eh_' thread. Access to variables used for controlling the reset sequence is
2044  * synchronized using host lock. Various functions called during reset process
2045  * would make use of a single command block, pointer to which is also stored in
2046  * adapter instance structure.
2047  *
2048  * Return Value
2049  *       None
2050  */
2051 static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2052 {
2053         struct pmcraid_instance *pinstance = cmd->drv_inst;
2054         u8 reset_complete = 0;
2055
2056         pinstance->ioa_reset_in_progress = 1;
2057
2058         if (pinstance->reset_cmd != cmd) {
2059                 pmcraid_err("reset is called with different command block\n");
2060                 pinstance->reset_cmd = cmd;
2061         }
2062
2063         pmcraid_info("reset_engine: state = %d, command = %p\n",
2064                       pinstance->ioa_state, cmd);
2065
2066         switch (pinstance->ioa_state) {
2067
2068         case IOA_STATE_DEAD:
2069                 /* If IOA is offline, whatever may be the reset reason, just
2070                  * return. callers might be waiting on the reset wait_q, wake
2071                  * up them
2072                  */
2073                 pmcraid_err("IOA is offline no reset is possible\n");
2074                 reset_complete = 1;
2075                 break;
2076
2077         case IOA_STATE_IN_BRINGDOWN:
2078                 /* we enter here, once ioa shutdown command is processed by IOA
2079                  * Alert IOA for a possible reset. If reset alert fails, IOA
2080                  * goes through hard-reset
2081                  */
2082                 pmcraid_disable_interrupts(pinstance, ~0);
2083                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2084                 pmcraid_reset_alert(cmd);
2085                 break;
2086
2087         case IOA_STATE_UNKNOWN:
2088                 /* We may be called during probe or resume. Some pre-processing
2089                  * is required for prior to reset
2090                  */
2091                 scsi_block_requests(pinstance->host);
2092
2093                 /* If asked to reset while IOA was processing responses or
2094                  * there are any error responses then IOA may require
2095                  * hard-reset.
2096                  */
2097                 if (pinstance->ioa_hard_reset == 0) {
2098                         if (ioread32(pinstance->ioa_status) &
2099                             INTRS_TRANSITION_TO_OPERATIONAL) {
2100                                 pmcraid_info("sticky bit set, bring-up\n");
2101                                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2102                                 pmcraid_reinit_cmdblk(cmd);
2103                                 pmcraid_identify_hrrq(cmd);
2104                         } else {
2105                                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2106                                 pmcraid_soft_reset(cmd);
2107                         }
2108                 } else {
2109                         /* Alert IOA of a possible reset and wait for critical
2110                          * operation in progress bit to reset
2111                          */
2112                         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2113                         pmcraid_reset_alert(cmd);
2114                 }
2115                 break;
2116
2117         case IOA_STATE_IN_RESET_ALERT:
2118                 /* If critical operation in progress bit is reset or wait gets
2119                  * timed out, reset proceeds with starting BIST on the IOA.
2120                  * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2121                  * they are 3 or more, reset engine marks IOA dead and returns
2122                  */
2123                 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2124                 pmcraid_start_bist(cmd);
2125                 break;
2126
2127         case IOA_STATE_IN_HARD_RESET:
2128                 pinstance->ioa_reset_attempts++;
2129
2130                 /* retry reset if we haven't reached maximum allowed limit */
2131                 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2132                         pinstance->ioa_reset_attempts = 0;
2133                         pmcraid_err("IOA didn't respond marking it as dead\n");
2134                         pinstance->ioa_state = IOA_STATE_DEAD;
2135
2136                         if (pinstance->ioa_bringdown)
2137                                 pmcraid_notify_ioastate(pinstance,
2138                                         PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2139                         else
2140                                 pmcraid_notify_ioastate(pinstance,
2141                                                 PMC_DEVICE_EVENT_RESET_FAILED);
2142                         reset_complete = 1;
2143                         break;
2144                 }
2145
2146                 /* Once either bist or pci reset is done, restore PCI config
2147                  * space. If this fails, proceed with hard reset again
2148                  */
2149                 pci_restore_state(pinstance->pdev);
2150
2151                 /* fail all pending commands */
2152                 pmcraid_fail_outstanding_cmds(pinstance);
2153
2154                 /* check if unit check is active, if so extract dump */
2155                 if (pinstance->ioa_unit_check) {
2156                         pmcraid_info("unit check is active\n");
2157                         pinstance->ioa_unit_check = 0;
2158                         pmcraid_get_dump(pinstance);
2159                         pinstance->ioa_reset_attempts--;
2160                         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2161                         pmcraid_reset_alert(cmd);
2162                         break;
2163                 }
2164
2165                 /* if the reset reason is to bring-down the ioa, we might be
2166                  * done with the reset restore pci_config_space and complete
2167                  * the reset
2168                  */
2169                 if (pinstance->ioa_bringdown) {
2170                         pmcraid_info("bringing down the adapter\n");
2171                         pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2172                         pinstance->ioa_bringdown = 0;
2173                         pinstance->ioa_state = IOA_STATE_UNKNOWN;
2174                         pmcraid_notify_ioastate(pinstance,
2175                                         PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2176                         reset_complete = 1;
2177                 } else {
2178                         /* bring-up IOA, so proceed with soft reset
2179                          * Reinitialize hrrq_buffers and their indices also
2180                          * enable interrupts after a pci_restore_state
2181                          */
2182                         if (pmcraid_reset_enable_ioa(pinstance)) {
2183                                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2184                                 pmcraid_info("bringing up the adapter\n");
2185                                 pmcraid_reinit_cmdblk(cmd);
2186                                 pmcraid_identify_hrrq(cmd);
2187                         } else {
2188                                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2189                                 pmcraid_soft_reset(cmd);
2190                         }
2191                 }
2192                 break;
2193
2194         case IOA_STATE_IN_SOFT_RESET:
2195                 /* TRANSITION TO OPERATIONAL is on so start initialization
2196                  * sequence
2197                  */
2198                 pmcraid_info("In softreset proceeding with bring-up\n");
2199                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2200
2201                 /* Initialization commands start with HRRQ identification. From
2202                  * now on tasklet completes most of the commands as IOA is up
2203                  * and intrs are enabled
2204                  */
2205                 pmcraid_identify_hrrq(cmd);
2206                 break;
2207
2208         case IOA_STATE_IN_BRINGUP:
2209                 /* we are done with bringing up of IOA, change the ioa_state to
2210                  * operational and wake up any waiters
2211                  */
2212                 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2213                 reset_complete = 1;
2214                 break;
2215
2216         case IOA_STATE_OPERATIONAL:
2217         default:
2218                 /* When IOA is operational and a reset is requested, check for
2219                  * the reset reason. If reset is to bring down IOA, unregister
2220                  * HCAMs and initiate shutdown; if adapter reset is forced then
2221                  * restart reset sequence again
2222                  */
2223                 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2224                     pinstance->force_ioa_reset == 0) {
2225                         pmcraid_notify_ioastate(pinstance,
2226                                                 PMC_DEVICE_EVENT_RESET_SUCCESS);
2227                         reset_complete = 1;
2228                 } else {
2229                         if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2230                                 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2231                         pmcraid_reinit_cmdblk(cmd);
2232                         pmcraid_unregister_hcams(cmd);
2233                 }
2234                 break;
2235         }
2236
2237         /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2238          * OPERATIONAL. Reset all control variables used during reset, wake up
2239          * any waiting threads and let the SCSI mid-layer send commands. Note
2240          * that host_lock must be held before invoking scsi_report_bus_reset.
2241          */
2242         if (reset_complete) {
2243                 pinstance->ioa_reset_in_progress = 0;
2244                 pinstance->ioa_reset_attempts = 0;
2245                 pinstance->reset_cmd = NULL;
2246                 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2247                 pinstance->ioa_bringdown = 0;
2248                 pmcraid_return_cmd(cmd);
2249
2250                 /* If target state is to bring up the adapter, proceed with
2251                  * hcam registration and resource exposure to mid-layer.
2252                  */
2253                 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2254                         pmcraid_register_hcams(pinstance);
2255
2256                 wake_up_all(&pinstance->reset_wait_q);
2257         }
2258
2259         return;
2260 }
2261
2262 /**
2263  * pmcraid_initiate_reset - initiates reset sequence. This is called from
2264  * ISR/tasklet during error interrupts including IOA unit check. If reset
2265  * is already in progress, it just returns, otherwise initiates IOA reset
2266  * to bring IOA up to operational state.
2267  *
2268  * @pinstance: pointer to adapter instance structure
2269  *
2270  * Return value
2271  *       none
2272  */
2273 static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2274 {
2275         struct pmcraid_cmd *cmd;
2276
2277         /* If the reset is already in progress, just return, otherwise start
2278          * reset sequence and return
2279          */
2280         if (!pinstance->ioa_reset_in_progress) {
2281                 scsi_block_requests(pinstance->host);
2282                 cmd = pmcraid_get_free_cmd(pinstance);
2283
2284                 if (cmd == NULL) {
2285                         pmcraid_err("no cmnd blocks for initiate_reset\n");
2286                         return;
2287                 }
2288
2289                 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2290                 pinstance->reset_cmd = cmd;
2291                 pinstance->force_ioa_reset = 1;
2292                 pmcraid_notify_ioastate(pinstance,
2293                                         PMC_DEVICE_EVENT_RESET_START);
2294                 pmcraid_ioa_reset(cmd);
2295         }
2296 }
2297
2298 /**
2299  * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2300  *                        or bringdown IOA
2301  * @pinstance: pointer adapter instance structure
2302  * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2303  * @target_state: expected target state after reset
2304  *
2305  * Note: This command initiates reset and waits for its completion. Hence this
2306  * should not be called from isr/timer/tasklet functions (timeout handlers,
2307  * error response handlers and interrupt handlers).
2308  *
2309  * Return Value
2310  *       1 in case ioa_state is not target_state, 0 otherwise.
2311  */
2312 static int pmcraid_reset_reload(
2313         struct pmcraid_instance *pinstance,
2314         u8 shutdown_type,
2315         u8 target_state
2316 )
2317 {
2318         struct pmcraid_cmd *reset_cmd = NULL;
2319         unsigned long lock_flags;
2320         int reset = 1;
2321
2322         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2323
2324         if (pinstance->ioa_reset_in_progress) {
2325                 pmcraid_info("reset_reload: reset is already in progress\n");
2326
2327                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2328
2329                 wait_event(pinstance->reset_wait_q,
2330                            !pinstance->ioa_reset_in_progress);
2331
2332                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2333
2334                 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2335                         pmcraid_info("reset_reload: IOA is dead\n");
2336                         goto out_unlock;
2337                 }
2338
2339                 if (pinstance->ioa_state == target_state) {
2340                         reset = 0;
2341                         goto out_unlock;
2342                 }
2343         }
2344
2345         pmcraid_info("reset_reload: proceeding with reset\n");
2346         scsi_block_requests(pinstance->host);
2347         reset_cmd = pmcraid_get_free_cmd(pinstance);
2348         if (reset_cmd == NULL) {
2349                 pmcraid_err("no free cmnd for reset_reload\n");
2350                 goto out_unlock;
2351         }
2352
2353         if (shutdown_type == SHUTDOWN_NORMAL)
2354                 pinstance->ioa_bringdown = 1;
2355
2356         pinstance->ioa_shutdown_type = shutdown_type;
2357         pinstance->reset_cmd = reset_cmd;
2358         pinstance->force_ioa_reset = reset;
2359         pmcraid_info("reset_reload: initiating reset\n");
2360         pmcraid_ioa_reset(reset_cmd);
2361         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2362         pmcraid_info("reset_reload: waiting for reset to complete\n");
2363         wait_event(pinstance->reset_wait_q,
2364                    !pinstance->ioa_reset_in_progress);
2365
2366         pmcraid_info("reset_reload: reset is complete !!\n");
2367         scsi_unblock_requests(pinstance->host);
2368         return pinstance->ioa_state != target_state;
2369
2370 out_unlock:
2371         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2372         return reset;
2373 }
2374
2375 /**
2376  * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2377  *
2378  * @pinstance: pointer to adapter instance structure
2379  *
2380  * Return Value
2381  *       whatever is returned from pmcraid_reset_reload
2382  */
2383 static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2384 {
2385         return pmcraid_reset_reload(pinstance,
2386                                     SHUTDOWN_NORMAL,
2387                                     IOA_STATE_UNKNOWN);
2388 }
2389
2390 /**
2391  * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2392  *
2393  * @pinstance: pointer to adapter instance structure
2394  *
2395  * Return Value
2396  *       whatever is returned from pmcraid_reset_reload
2397  */
2398 static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2399 {
2400         pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2401
2402         return pmcraid_reset_reload(pinstance,
2403                                     SHUTDOWN_NONE,
2404                                     IOA_STATE_OPERATIONAL);
2405 }
2406
2407 /**
2408  * pmcraid_request_sense - Send request sense to a device
2409  * @cmd: pmcraid command struct
2410  *
2411  * This function sends a request sense to a device as a result of a check
2412  * condition. This method re-uses the same command block that failed earlier.
2413  */
2414 static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2415 {
2416         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2417         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2418         struct device *dev = &cmd->drv_inst->pdev->dev;
2419
2420         cmd->sense_buffer = cmd->scsi_cmd->sense_buffer;
2421         cmd->sense_buffer_dma = dma_map_single(dev, cmd->sense_buffer,
2422                         SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
2423         if (dma_mapping_error(dev, cmd->sense_buffer_dma)) {
2424                 pmcraid_err
2425                         ("couldn't allocate sense buffer for request sense\n");
2426                 pmcraid_erp_done(cmd);
2427                 return;
2428         }
2429
2430         /* re-use the command block */
2431         memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2432         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2433         ioarcb->request_flags0 = (SYNC_COMPLETE |
2434                                   NO_LINK_DESCS |
2435                                   INHIBIT_UL_CHECK);
2436         ioarcb->request_type = REQ_TYPE_SCSI;
2437         ioarcb->cdb[0] = REQUEST_SENSE;
2438         ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2439
2440         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2441                                         offsetof(struct pmcraid_ioarcb,
2442                                                 add_data.u.ioadl[0]));
2443         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2444
2445         ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2446
2447         ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2448         ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2449         ioadl->flags = IOADL_FLAGS_LAST_DESC;
2450
2451         /* request sense might be called as part of error response processing
2452          * which runs in tasklets context. It is possible that mid-layer might
2453          * schedule queuecommand during this time, hence, writting to IOARRIN
2454          * must be protect by host_lock
2455          */
2456         pmcraid_send_cmd(cmd, pmcraid_erp_done,
2457                          PMCRAID_REQUEST_SENSE_TIMEOUT,
2458                          pmcraid_timeout_handler);
2459 }
2460
2461 /**
2462  * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2463  * @cmd: command that failed
2464  * @need_sense: true if request_sense is required after cancel all
2465  *
2466  * This function sends a cancel all to a device to clear the queue.
2467  */
2468 static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, bool need_sense)
2469 {
2470         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2471         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2472         struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2473
2474         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2475         ioarcb->request_flags0 = SYNC_OVERRIDE;
2476         ioarcb->request_type = REQ_TYPE_IOACMD;
2477         ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2478
2479         if (RES_IS_GSCSI(res->cfg_entry))
2480                 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2481
2482         ioarcb->ioadl_bus_addr = 0;
2483         ioarcb->ioadl_length = 0;
2484         ioarcb->data_transfer_length = 0;
2485         ioarcb->ioarcb_bus_addr &= cpu_to_le64((~0x1FULL));
2486
2487         /* writing to IOARRIN must be protected by host_lock, as mid-layer
2488          * schedule queuecommand while we are doing this
2489          */
2490         pmcraid_send_cmd(cmd, need_sense ?
2491                          pmcraid_erp_done : pmcraid_request_sense,
2492                          PMCRAID_REQUEST_SENSE_TIMEOUT,
2493                          pmcraid_timeout_handler);
2494 }
2495
2496 /**
2497  * pmcraid_frame_auto_sense: frame fixed format sense information
2498  *
2499  * @cmd: pointer to failing command block
2500  *
2501  * Return value
2502  *  none
2503  */
2504 static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2505 {
2506         u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2507         struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2508         struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2509         u32 ioasc = le32_to_cpu(ioasa->ioasc);
2510         u32 failing_lba = 0;
2511
2512         memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2513         cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2514
2515         if (RES_IS_VSET(res->cfg_entry) &&
2516             ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2517             ioasa->u.vset.failing_lba_hi != 0) {
2518
2519                 sense_buf[0] = 0x72;
2520                 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2521                 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2522                 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2523
2524                 sense_buf[7] = 12;
2525                 sense_buf[8] = 0;
2526                 sense_buf[9] = 0x0A;
2527                 sense_buf[10] = 0x80;
2528
2529                 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2530
2531                 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2532                 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2533                 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2534                 sense_buf[15] = failing_lba & 0x000000ff;
2535
2536                 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2537
2538                 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2539                 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2540                 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2541                 sense_buf[19] = failing_lba & 0x000000ff;
2542         } else {
2543                 sense_buf[0] = 0x70;
2544                 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2545                 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2546                 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2547
2548                 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2549                         if (RES_IS_VSET(res->cfg_entry))
2550                                 failing_lba =
2551                                         le32_to_cpu(ioasa->u.
2552                                                  vset.failing_lba_lo);
2553                         sense_buf[0] |= 0x80;
2554                         sense_buf[3] = (failing_lba >> 24) & 0xff;
2555                         sense_buf[4] = (failing_lba >> 16) & 0xff;
2556                         sense_buf[5] = (failing_lba >> 8) & 0xff;
2557                         sense_buf[6] = failing_lba & 0xff;
2558                 }
2559
2560                 sense_buf[7] = 6; /* additional length */
2561         }
2562 }
2563
2564 /**
2565  * pmcraid_error_handler - Error response handlers for a SCSI op
2566  * @cmd: pointer to pmcraid_cmd that has failed
2567  *
2568  * This function determines whether or not to initiate ERP on the affected
2569  * device. This is called from a tasklet, which doesn't hold any locks.
2570  *
2571  * Return value:
2572  *       0 it caller can complete the request, otherwise 1 where in error
2573  *       handler itself completes the request and returns the command block
2574  *       back to free-pool
2575  */
2576 static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2577 {
2578         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2579         struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2580         struct pmcraid_instance *pinstance = cmd->drv_inst;
2581         struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2582         u32 ioasc = le32_to_cpu(ioasa->ioasc);
2583         u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2584         bool sense_copied = false;
2585
2586         if (!res) {
2587                 pmcraid_info("resource pointer is NULL\n");
2588                 return 0;
2589         }
2590
2591         /* If this was a SCSI read/write command keep count of errors */
2592         if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2593                 atomic_inc(&res->read_failures);
2594         else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2595                 atomic_inc(&res->write_failures);
2596
2597         if (!RES_IS_GSCSI(res->cfg_entry) &&
2598                 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2599                 pmcraid_frame_auto_sense(cmd);
2600         }
2601
2602         /* Log IOASC/IOASA information based on user settings */
2603         pmcraid_ioasc_logger(ioasc, cmd);
2604
2605         switch (masked_ioasc) {
2606
2607         case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2608                 scsi_cmd->result |= (DID_ABORT << 16);
2609                 break;
2610
2611         case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2612         case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2613                 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2614                 break;
2615
2616         case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2617                 res->sync_reqd = 1;
2618                 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2619                 break;
2620
2621         case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2622                 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2623                 break;
2624
2625         case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2626         case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2627                 if (!res->reset_progress)
2628                         scsi_report_bus_reset(pinstance->host,
2629                                               scsi_cmd->device->channel);
2630                 scsi_cmd->result |= (DID_ERROR << 16);
2631                 break;
2632
2633         case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2634                 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2635                 res->sync_reqd = 1;
2636
2637                 /* if check_condition is not active return with error otherwise
2638                  * get/frame the sense buffer
2639                  */
2640                 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2641                     SAM_STAT_CHECK_CONDITION &&
2642                     PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2643                         return 0;
2644
2645                 /* If we have auto sense data as part of IOASA pass it to
2646                  * mid-layer
2647                  */
2648                 if (ioasa->auto_sense_length != 0) {
2649                         short sense_len = le16_to_cpu(ioasa->auto_sense_length);
2650                         int data_size = min_t(u16, sense_len,
2651                                               SCSI_SENSE_BUFFERSIZE);
2652
2653                         memcpy(scsi_cmd->sense_buffer,
2654                                ioasa->sense_data,
2655                                data_size);
2656                         sense_copied = true;
2657                 }
2658
2659                 if (RES_IS_GSCSI(res->cfg_entry))
2660                         pmcraid_cancel_all(cmd, sense_copied);
2661                 else if (sense_copied)
2662                         pmcraid_erp_done(cmd);
2663                 else
2664                         pmcraid_request_sense(cmd);
2665
2666                 return 1;
2667
2668         case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2669                 break;
2670
2671         default:
2672                 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2673                         scsi_cmd->result |= (DID_ERROR << 16);
2674                 break;
2675         }
2676         return 0;
2677 }
2678
2679 /**
2680  * pmcraid_reset_device - device reset handler functions
2681  *
2682  * @scsi_cmd: scsi command struct
2683  * @timeout: command timeout
2684  * @modifier: reset modifier indicating the reset sequence to be performed
2685  *
2686  * This function issues a device reset to the affected device.
2687  * A LUN reset will be sent to the device first. If that does
2688  * not work, a target reset will be sent.
2689  *
2690  * Return value:
2691  *      SUCCESS / FAILED
2692  */
2693 static int pmcraid_reset_device(
2694         struct scsi_cmnd *scsi_cmd,
2695         unsigned long timeout,
2696         u8 modifier)
2697 {
2698         struct pmcraid_cmd *cmd;
2699         struct pmcraid_instance *pinstance;
2700         struct pmcraid_resource_entry *res;
2701         struct pmcraid_ioarcb *ioarcb;
2702         unsigned long lock_flags;
2703         u32 ioasc;
2704
2705         pinstance =
2706                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2707         res = scsi_cmd->device->hostdata;
2708
2709         if (!res) {
2710                 sdev_printk(KERN_ERR, scsi_cmd->device,
2711                             "reset_device: NULL resource pointer\n");
2712                 return FAILED;
2713         }
2714
2715         /* If adapter is currently going through reset/reload, return failed.
2716          * This will force the mid-layer to call _eh_bus/host reset, which
2717          * will then go to sleep and wait for the reset to complete
2718          */
2719         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2720         if (pinstance->ioa_reset_in_progress ||
2721             pinstance->ioa_state == IOA_STATE_DEAD) {
2722                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2723                 return FAILED;
2724         }
2725
2726         res->reset_progress = 1;
2727         pmcraid_info("Resetting %s resource with addr %x\n",
2728                      ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2729                      ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2730                      le32_to_cpu(res->cfg_entry.resource_address));
2731
2732         /* get a free cmd block */
2733         cmd = pmcraid_get_free_cmd(pinstance);
2734
2735         if (cmd == NULL) {
2736                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2737                 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2738                 return FAILED;
2739         }
2740
2741         ioarcb = &cmd->ioa_cb->ioarcb;
2742         ioarcb->resource_handle = res->cfg_entry.resource_handle;
2743         ioarcb->request_type = REQ_TYPE_IOACMD;
2744         ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2745
2746         /* Initialize reset modifier bits */
2747         if (modifier)
2748                 modifier = ENABLE_RESET_MODIFIER | modifier;
2749
2750         ioarcb->cdb[1] = modifier;
2751
2752         init_completion(&cmd->wait_for_completion);
2753         cmd->completion_req = 1;
2754
2755         pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2756                      cmd->ioa_cb->ioarcb.cdb[0],
2757                      le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2758                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2759
2760         pmcraid_send_cmd(cmd,
2761                          pmcraid_internal_done,
2762                          timeout,
2763                          pmcraid_timeout_handler);
2764
2765         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2766
2767         /* RESET_DEVICE command completes after all pending IOARCBs are
2768          * completed. Once this command is completed, pmcraind_internal_done
2769          * will wake up the 'completion' queue.
2770          */
2771         wait_for_completion(&cmd->wait_for_completion);
2772
2773         /* complete the command here itself and return the command block
2774          * to free list
2775          */
2776         pmcraid_return_cmd(cmd);
2777         res->reset_progress = 0;
2778         ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2779
2780         /* set the return value based on the returned ioasc */
2781         return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2782 }
2783
2784 /**
2785  * _pmcraid_io_done - helper for pmcraid_io_done function
2786  *
2787  * @cmd: pointer to pmcraid command struct
2788  * @reslen: residual data length to be set in the ioasa
2789  * @ioasc: ioasc either returned by IOA or set by driver itself.
2790  *
2791  * This function is invoked by pmcraid_io_done to complete mid-layer
2792  * scsi ops.
2793  *
2794  * Return value:
2795  *        0 if caller is required to return it to free_pool. Returns 1 if
2796  *        caller need not worry about freeing command block as error handler
2797  *        will take care of that.
2798  */
2799
2800 static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2801 {
2802         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2803         int rc = 0;
2804
2805         scsi_set_resid(scsi_cmd, reslen);
2806
2807         pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2808                 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2809                 cmd->ioa_cb->ioarcb.cdb[0],
2810                 ioasc, scsi_cmd->result);
2811
2812         if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2813                 rc = pmcraid_error_handler(cmd);
2814
2815         if (rc == 0) {
2816                 scsi_dma_unmap(scsi_cmd);
2817                 scsi_cmd->scsi_done(scsi_cmd);
2818         }
2819
2820         return rc;
2821 }
2822
2823 /**
2824  * pmcraid_io_done - SCSI completion function
2825  *
2826  * @cmd: pointer to pmcraid command struct
2827  *
2828  * This function is invoked by tasklet/mid-layer error handler to completing
2829  * the SCSI ops sent from mid-layer.
2830  *
2831  * Return value
2832  *        none
2833  */
2834
2835 static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2836 {
2837         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2838         u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2839
2840         if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2841                 pmcraid_return_cmd(cmd);
2842 }
2843
2844 /**
2845  * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2846  *
2847  * @cmd: command block of the command to be aborted
2848  *
2849  * Return Value:
2850  *       returns pointer to command structure used as cancelling cmd
2851  */
2852 static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2853 {
2854         struct pmcraid_cmd *cancel_cmd;
2855         struct pmcraid_instance *pinstance;
2856
2857         pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2858
2859         cancel_cmd = pmcraid_get_free_cmd(pinstance);
2860
2861         if (cancel_cmd == NULL) {
2862                 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2863                 return NULL;
2864         }
2865
2866         pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2867
2868         pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2869                 cmd->ioa_cb->ioarcb.cdb[0],
2870                 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2871
2872         init_completion(&cancel_cmd->wait_for_completion);
2873         cancel_cmd->completion_req = 1;
2874
2875         pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2876                 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2877                 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2878                 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2879
2880         pmcraid_send_cmd(cancel_cmd,
2881                          pmcraid_internal_done,
2882                          PMCRAID_INTERNAL_TIMEOUT,
2883                          pmcraid_timeout_handler);
2884         return cancel_cmd;
2885 }
2886
2887 /**
2888  * pmcraid_abort_complete - Waits for ABORT TASK completion
2889  *
2890  * @cancel_cmd: command block use as cancelling command
2891  *
2892  * Return Value:
2893  *       returns SUCCESS if ABORT TASK has good completion
2894  *       otherwise FAILED
2895  */
2896 static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2897 {
2898         struct pmcraid_resource_entry *res;
2899         u32 ioasc;
2900
2901         wait_for_completion(&cancel_cmd->wait_for_completion);
2902         res = cancel_cmd->res;
2903         cancel_cmd->res = NULL;
2904         ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2905
2906         /* If the abort task is not timed out we will get a Good completion
2907          * as sense_key, otherwise we may get one the following responses
2908          * due to subsequent bus reset or device reset. In case IOASC is
2909          * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2910          */
2911         if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
2912             ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
2913                 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
2914                         res->sync_reqd = 1;
2915                 ioasc = 0;
2916         }
2917
2918         /* complete the command here itself */
2919         pmcraid_return_cmd(cancel_cmd);
2920         return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2921 }
2922
2923 /**
2924  * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
2925  *
2926  * @scsi_cmd:   scsi command struct given by mid-layer. When this is called
2927  *              mid-layer ensures that no other commands are queued. This
2928  *              never gets called under interrupt, but a separate eh thread.
2929  *
2930  * Return value:
2931  *       SUCCESS / FAILED
2932  */
2933 static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
2934 {
2935         struct pmcraid_instance *pinstance;
2936         struct pmcraid_cmd *cmd;
2937         struct pmcraid_resource_entry *res;
2938         unsigned long host_lock_flags;
2939         unsigned long pending_lock_flags;
2940         struct pmcraid_cmd *cancel_cmd = NULL;
2941         int cmd_found = 0;
2942         int rc = FAILED;
2943
2944         pinstance =
2945                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2946
2947         scmd_printk(KERN_INFO, scsi_cmd,
2948                     "I/O command timed out, aborting it.\n");
2949
2950         res = scsi_cmd->device->hostdata;
2951
2952         if (res == NULL)
2953                 return rc;
2954
2955         /* If we are currently going through reset/reload, return failed.
2956          * This will force the mid-layer to eventually call
2957          * pmcraid_eh_host_reset which will then go to sleep and wait for the
2958          * reset to complete
2959          */
2960         spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
2961
2962         if (pinstance->ioa_reset_in_progress ||
2963             pinstance->ioa_state == IOA_STATE_DEAD) {
2964                 spin_unlock_irqrestore(pinstance->host->host_lock,
2965                                        host_lock_flags);
2966                 return rc;
2967         }
2968
2969         /* loop over pending cmd list to find cmd corresponding to this
2970          * scsi_cmd. Note that this command might not have been completed
2971          * already. locking: all pending commands are protected with
2972          * pending_pool_lock.
2973          */
2974         spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
2975         list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
2976
2977                 if (cmd->scsi_cmd == scsi_cmd) {
2978                         cmd_found = 1;
2979                         break;
2980                 }
2981         }
2982
2983         spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2984                                 pending_lock_flags);
2985
2986         /* If the command to be aborted was given to IOA and still pending with
2987          * it, send ABORT_TASK to abort this and wait for its completion
2988          */
2989         if (cmd_found)
2990                 cancel_cmd = pmcraid_abort_cmd(cmd);
2991
2992         spin_unlock_irqrestore(pinstance->host->host_lock,
2993                                host_lock_flags);
2994
2995         if (cancel_cmd) {
2996                 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
2997                 rc = pmcraid_abort_complete(cancel_cmd);
2998         }
2999
3000         return cmd_found ? rc : SUCCESS;
3001 }
3002
3003 /**
3004  * pmcraid_eh_device_reset_handler - bus/target/device reset handler callbacks
3005  *
3006  * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3007  *
3008  * All these routines invokve pmcraid_reset_device with appropriate parameters.
3009  * Since these are called from mid-layer EH thread, no other IO will be queued
3010  * to the resource being reset. However, control path (IOCTL) may be active so
3011  * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3012  * takes care by locking/unlocking host_lock.
3013  *
3014  * Return value
3015  *      SUCCESS or FAILED
3016  */
3017 static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3018 {
3019         scmd_printk(KERN_INFO, scmd,
3020                     "resetting device due to an I/O command timeout.\n");
3021         return pmcraid_reset_device(scmd,
3022                                     PMCRAID_INTERNAL_TIMEOUT,
3023                                     RESET_DEVICE_LUN);
3024 }
3025
3026 static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3027 {
3028         scmd_printk(KERN_INFO, scmd,
3029                     "Doing bus reset due to an I/O command timeout.\n");
3030         return pmcraid_reset_device(scmd,
3031                                     PMCRAID_RESET_BUS_TIMEOUT,
3032                                     RESET_DEVICE_BUS);
3033 }
3034
3035 static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3036 {
3037         scmd_printk(KERN_INFO, scmd,
3038                     "Doing target reset due to an I/O command timeout.\n");
3039         return pmcraid_reset_device(scmd,
3040                                     PMCRAID_INTERNAL_TIMEOUT,
3041                                     RESET_DEVICE_TARGET);
3042 }
3043
3044 /**
3045  * pmcraid_eh_host_reset_handler - adapter reset handler callback
3046  *
3047  * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3048  *
3049  * Initiates adapter reset to bring it up to operational state
3050  *
3051  * Return value
3052  *      SUCCESS or FAILED
3053  */
3054 static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3055 {
3056         unsigned long interval = 10000; /* 10 seconds interval */
3057         int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3058         struct pmcraid_instance *pinstance =
3059                 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3060
3061
3062         /* wait for an additional 150 seconds just in case firmware could come
3063          * up and if it could complete all the pending commands excluding the
3064          * two HCAM (CCN and LDN).
3065          */
3066         while (waits--) {
3067                 if (atomic_read(&pinstance->outstanding_cmds) <=
3068                     PMCRAID_MAX_HCAM_CMD)
3069                         return SUCCESS;
3070                 msleep(interval);
3071         }
3072
3073         dev_err(&pinstance->pdev->dev,
3074                 "Adapter being reset due to an I/O command timeout.\n");
3075         return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3076 }
3077
3078 /**
3079  * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3080  * @cmd: pmcraid command struct
3081  * @sgcount: count of scatter-gather elements
3082  *
3083  * Return value
3084  *   returns pointer pmcraid_ioadl_desc, initialized to point to internal
3085  *   or external IOADLs
3086  */
3087 static struct pmcraid_ioadl_desc *
3088 pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3089 {
3090         struct pmcraid_ioadl_desc *ioadl;
3091         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3092         int ioadl_count = 0;
3093
3094         if (ioarcb->add_cmd_param_length)
3095                 ioadl_count = DIV_ROUND_UP(le16_to_cpu(ioarcb->add_cmd_param_length), 16);
3096         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc) * sgcount);
3097
3098         if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3099                 /* external ioadls start at offset 0x80 from control_block
3100                  * structure, re-using 24 out of 27 ioadls part of IOARCB.
3101                  * It is necessary to indicate to firmware that driver is
3102                  * using ioadls to be treated as external to IOARCB.
3103                  */
3104                 ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
3105                 ioarcb->ioadl_bus_addr =
3106                         cpu_to_le64((cmd->ioa_cb_bus_addr) +
3107                                 offsetof(struct pmcraid_ioarcb,
3108                                         add_data.u.ioadl[3]));
3109                 ioadl = &ioarcb->add_data.u.ioadl[3];
3110         } else {
3111                 ioarcb->ioadl_bus_addr =
3112                         cpu_to_le64((cmd->ioa_cb_bus_addr) +
3113                                 offsetof(struct pmcraid_ioarcb,
3114                                         add_data.u.ioadl[ioadl_count]));
3115
3116                 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3117                 ioarcb->ioarcb_bus_addr |=
3118                         cpu_to_le64(DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8));
3119         }
3120
3121         return ioadl;
3122 }
3123
3124 /**
3125  * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3126  * @pinstance: pointer to adapter instance structure
3127  * @cmd: pmcraid command struct
3128  *
3129  * This function is invoked by queuecommand entry point while sending a command
3130  * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3131  *
3132  * Return value:
3133  *      0 on success or -1 on failure
3134  */
3135 static int pmcraid_build_ioadl(
3136         struct pmcraid_instance *pinstance,
3137         struct pmcraid_cmd *cmd
3138 )
3139 {
3140         int i, nseg;
3141         struct scatterlist *sglist;
3142
3143         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3144         struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3145         struct pmcraid_ioadl_desc *ioadl;
3146
3147         u32 length = scsi_bufflen(scsi_cmd);
3148
3149         if (!length)
3150                 return 0;
3151
3152         nseg = scsi_dma_map(scsi_cmd);
3153
3154         if (nseg < 0) {
3155                 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3156                 return -1;
3157         } else if (nseg > PMCRAID_MAX_IOADLS) {
3158                 scsi_dma_unmap(scsi_cmd);
3159                 scmd_printk(KERN_ERR, scsi_cmd,
3160                         "sg count is (%d) more than allowed!\n", nseg);
3161                 return -1;
3162         }
3163
3164         /* Initialize IOARCB data transfer length fields */
3165         if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3166                 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3167
3168         ioarcb->request_flags0 |= NO_LINK_DESCS;
3169         ioarcb->data_transfer_length = cpu_to_le32(length);
3170         ioadl = pmcraid_init_ioadls(cmd, nseg);
3171
3172         /* Initialize IOADL descriptor addresses */
3173         scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3174                 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3175                 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3176                 ioadl[i].flags = 0;
3177         }
3178         /* setup last descriptor */
3179         ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3180
3181         return 0;
3182 }
3183
3184 /**
3185  * pmcraid_free_sglist - Frees an allocated SG buffer list
3186  * @sglist: scatter/gather list pointer
3187  *
3188  * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
3189  *
3190  * Return value:
3191  *      none
3192  */
3193 static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
3194 {
3195         sgl_free_order(sglist->scatterlist, sglist->order);
3196         kfree(sglist);
3197 }
3198
3199 /**
3200  * pmcraid_alloc_sglist - Allocates memory for a SG list
3201  * @buflen: buffer length
3202  *
3203  * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
3204  * list.
3205  *
3206  * Return value
3207  *      pointer to sglist / NULL on failure
3208  */
3209 static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
3210 {
3211         struct pmcraid_sglist *sglist;
3212         int sg_size;
3213         int order;
3214
3215         sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
3216         order = (sg_size > 0) ? get_order(sg_size) : 0;
3217
3218         /* Allocate a scatter/gather list for the DMA */
3219         sglist = kzalloc(sizeof(struct pmcraid_sglist), GFP_KERNEL);
3220         if (sglist == NULL)
3221                 return NULL;
3222
3223         sglist->order = order;
3224         sgl_alloc_order(buflen, order, false,
3225                         GFP_KERNEL | GFP_DMA | __GFP_ZERO, &sglist->num_sg);
3226
3227         return sglist;
3228 }
3229
3230 /**
3231  * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
3232  * @sglist: scatter/gather list pointer
3233  * @buffer: buffer pointer
3234  * @len: buffer length
3235  * @direction: data transfer direction
3236  *
3237  * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
3238  *
3239  * Return value:
3240  * 0 on success / other on failure
3241  */
3242 static int pmcraid_copy_sglist(
3243         struct pmcraid_sglist *sglist,
3244         void __user *buffer,
3245         u32 len,
3246         int direction
3247 )
3248 {
3249         struct scatterlist *sg;
3250         void *kaddr;
3251         int bsize_elem;
3252         int i;
3253         int rc = 0;
3254
3255         /* Determine the actual number of bytes per element */
3256         bsize_elem = PAGE_SIZE * (1 << sglist->order);
3257
3258         sg = sglist->scatterlist;
3259
3260         for (i = 0; i < (len / bsize_elem); i++, sg = sg_next(sg), buffer += bsize_elem) {
3261                 struct page *page = sg_page(sg);
3262
3263                 kaddr = kmap(page);
3264                 if (direction == DMA_TO_DEVICE)
3265                         rc = copy_from_user(kaddr, buffer, bsize_elem);
3266                 else
3267                         rc = copy_to_user(buffer, kaddr, bsize_elem);
3268
3269                 kunmap(page);
3270
3271                 if (rc) {
3272                         pmcraid_err("failed to copy user data into sg list\n");
3273                         return -EFAULT;
3274                 }
3275
3276                 sg->length = bsize_elem;
3277         }
3278
3279         if (len % bsize_elem) {
3280                 struct page *page = sg_page(sg);
3281
3282                 kaddr = kmap(page);
3283
3284                 if (direction == DMA_TO_DEVICE)
3285                         rc = copy_from_user(kaddr, buffer, len % bsize_elem);
3286                 else
3287                         rc = copy_to_user(buffer, kaddr, len % bsize_elem);
3288
3289                 kunmap(page);
3290
3291                 sg->length = len % bsize_elem;
3292         }
3293
3294         if (rc) {
3295                 pmcraid_err("failed to copy user data into sg list\n");
3296                 rc = -EFAULT;
3297         }
3298
3299         return rc;
3300 }
3301
3302 /**
3303  * pmcraid_queuecommand_lck - Queue a mid-layer request
3304  * @scsi_cmd: scsi command struct
3305  * @done: done function
3306  *
3307  * This function queues a request generated by the mid-layer. Midlayer calls
3308  * this routine within host->lock. Some of the functions called by queuecommand
3309  * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3310  *
3311  * Return value:
3312  *        0 on success
3313  *        SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3314  *        SCSI_MLQUEUE_HOST_BUSY if host is busy
3315  */
3316 static int pmcraid_queuecommand_lck(
3317         struct scsi_cmnd *scsi_cmd,
3318         void (*done) (struct scsi_cmnd *)
3319 )
3320 {
3321         struct pmcraid_instance *pinstance;
3322         struct pmcraid_resource_entry *res;
3323         struct pmcraid_ioarcb *ioarcb;
3324         struct pmcraid_cmd *cmd;
3325         u32 fw_version;
3326         int rc = 0;
3327
3328         pinstance =
3329                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3330         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3331         scsi_cmd->scsi_done = done;
3332         res = scsi_cmd->device->hostdata;
3333         scsi_cmd->result = (DID_OK << 16);
3334
3335         /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3336          * the command
3337          */
3338         if (pinstance->ioa_state == IOA_STATE_DEAD) {
3339                 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3340                 scsi_cmd->result = (DID_NO_CONNECT << 16);
3341                 scsi_cmd->scsi_done(scsi_cmd);
3342                 return 0;
3343         }
3344
3345         /* If IOA reset is in progress, can't queue the commands */
3346         if (pinstance->ioa_reset_in_progress)
3347                 return SCSI_MLQUEUE_HOST_BUSY;
3348
3349         /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3350          * the command here itself with success return
3351          */
3352         if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3353                 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3354                 scsi_cmd->scsi_done(scsi_cmd);
3355                 return 0;
3356         }
3357
3358         /* initialize the command and IOARCB to be sent to IOA */
3359         cmd = pmcraid_get_free_cmd(pinstance);
3360
3361         if (cmd == NULL) {
3362                 pmcraid_err("free command block is not available\n");
3363                 return SCSI_MLQUEUE_HOST_BUSY;
3364         }
3365
3366         cmd->scsi_cmd = scsi_cmd;
3367         ioarcb = &(cmd->ioa_cb->ioarcb);
3368         memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3369         ioarcb->resource_handle = res->cfg_entry.resource_handle;
3370         ioarcb->request_type = REQ_TYPE_SCSI;
3371
3372         /* set hrrq number where the IOA should respond to. Note that all cmds
3373          * generated internally uses hrrq_id 0, exception to this is the cmd
3374          * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3375          * hrrq_id assigned here in queuecommand
3376          */
3377         ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3378                           pinstance->num_hrrq;
3379         cmd->cmd_done = pmcraid_io_done;
3380
3381         if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3382                 if (scsi_cmd->underflow == 0)
3383                         ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3384
3385                 if (res->sync_reqd) {
3386                         ioarcb->request_flags0 |= SYNC_COMPLETE;
3387                         res->sync_reqd = 0;
3388                 }
3389
3390                 ioarcb->request_flags0 |= NO_LINK_DESCS;
3391
3392                 if (scsi_cmd->flags & SCMD_TAGGED)
3393                         ioarcb->request_flags1 |= TASK_TAG_SIMPLE;
3394
3395                 if (RES_IS_GSCSI(res->cfg_entry))
3396                         ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3397         }
3398
3399         rc = pmcraid_build_ioadl(pinstance, cmd);
3400
3401         pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3402                      le32_to_cpu(ioarcb->response_handle) >> 2,
3403                      scsi_cmd->cmnd[0], pinstance->host->unique_id,
3404                      RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3405                         PMCRAID_PHYS_BUS_ID,
3406                      RES_IS_VSET(res->cfg_entry) ?
3407                         (fw_version <= PMCRAID_FW_VERSION_1 ?
3408                                 res->cfg_entry.unique_flags1 :
3409                                 le16_to_cpu(res->cfg_entry.array_id) & 0xFF) :
3410                         RES_TARGET(res->cfg_entry.resource_address),
3411                      RES_LUN(res->cfg_entry.resource_address));
3412
3413         if (likely(rc == 0)) {
3414                 _pmcraid_fire_command(cmd);
3415         } else {
3416                 pmcraid_err("queuecommand could not build ioadl\n");
3417                 pmcraid_return_cmd(cmd);
3418                 rc = SCSI_MLQUEUE_HOST_BUSY;
3419         }
3420
3421         return rc;
3422 }
3423
3424 static DEF_SCSI_QCMD(pmcraid_queuecommand)
3425
3426 /*
3427  * pmcraid_open -char node "open" entry, allowed only users with admin access
3428  */
3429 static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3430 {
3431         struct pmcraid_instance *pinstance;
3432
3433         if (!capable(CAP_SYS_ADMIN))
3434                 return -EACCES;
3435
3436         /* Populate adapter instance * pointer for use by ioctl */
3437         pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3438         filep->private_data = pinstance;
3439
3440         return 0;
3441 }
3442
3443 /*
3444  * pmcraid_fasync - Async notifier registration from applications
3445  *
3446  * This function adds the calling process to a driver global queue. When an
3447  * event occurs, SIGIO will be sent to all processes in this queue.
3448  */
3449 static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3450 {
3451         struct pmcraid_instance *pinstance;
3452         int rc;
3453
3454         pinstance = filep->private_data;
3455         mutex_lock(&pinstance->aen_queue_lock);
3456         rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3457         mutex_unlock(&pinstance->aen_queue_lock);
3458
3459         return rc;
3460 }
3461
3462
3463 /**
3464  * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3465  * commands sent over IOCTL interface
3466  *
3467  * @cmd       : pointer to struct pmcraid_cmd
3468  * @buflen    : length of the request buffer
3469  * @direction : data transfer direction
3470  *
3471  * Return value
3472  *  0 on success, non-zero error code on failure
3473  */
3474 static int pmcraid_build_passthrough_ioadls(
3475         struct pmcraid_cmd *cmd,
3476         int buflen,
3477         int direction
3478 )
3479 {
3480         struct pmcraid_sglist *sglist = NULL;
3481         struct scatterlist *sg = NULL;
3482         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3483         struct pmcraid_ioadl_desc *ioadl;
3484         int i;
3485
3486         sglist = pmcraid_alloc_sglist(buflen);
3487
3488         if (!sglist) {
3489                 pmcraid_err("can't allocate memory for passthrough SGls\n");
3490                 return -ENOMEM;
3491         }
3492
3493         sglist->num_dma_sg = dma_map_sg(&cmd->drv_inst->pdev->dev,
3494                                         sglist->scatterlist,
3495                                         sglist->num_sg, direction);
3496
3497         if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3498                 dev_err(&cmd->drv_inst->pdev->dev,
3499                         "Failed to map passthrough buffer!\n");
3500                 pmcraid_free_sglist(sglist);
3501                 return -EIO;
3502         }
3503
3504         cmd->sglist = sglist;
3505         ioarcb->request_flags0 |= NO_LINK_DESCS;
3506
3507         ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3508
3509         /* Initialize IOADL descriptor addresses */
3510         for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3511                 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3512                 ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3513                 ioadl[i].flags = 0;
3514         }
3515
3516         /* setup the last descriptor */
3517         ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3518
3519         return 0;
3520 }
3521
3522
3523 /**
3524  * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3525  *
3526  * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3527  * @buflen: size of the request buffer
3528  * @direction: data transfer direction
3529  *
3530  * Return value
3531  *  0 on success, non-zero error code on failure
3532  */
3533 static void pmcraid_release_passthrough_ioadls(
3534         struct pmcraid_cmd *cmd,
3535         int buflen,
3536         int direction
3537 )
3538 {
3539         struct pmcraid_sglist *sglist = cmd->sglist;
3540
3541         if (buflen > 0) {
3542                 dma_unmap_sg(&cmd->drv_inst->pdev->dev,
3543                              sglist->scatterlist,
3544                              sglist->num_sg,
3545                              direction);
3546                 pmcraid_free_sglist(sglist);
3547                 cmd->sglist = NULL;
3548         }
3549 }
3550
3551 /**
3552  * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3553  *
3554  * @pinstance: pointer to adapter instance structure
3555  * @ioctl_cmd: ioctl code
3556  * @buflen: unused
3557  * @arg: pointer to pmcraid_passthrough_buffer user buffer
3558  *
3559  * Return value
3560  *  0 on success, non-zero error code on failure
3561  */
3562 static long pmcraid_ioctl_passthrough(
3563         struct pmcraid_instance *pinstance,
3564         unsigned int ioctl_cmd,
3565         unsigned int buflen,
3566         void __user *arg
3567 )
3568 {
3569         struct pmcraid_passthrough_ioctl_buffer *buffer;
3570         struct pmcraid_ioarcb *ioarcb;
3571         struct pmcraid_cmd *cmd;
3572         struct pmcraid_cmd *cancel_cmd;
3573         void __user *request_buffer;
3574         unsigned long request_offset;
3575         unsigned long lock_flags;
3576         void __user *ioasa;
3577         u32 ioasc;
3578         int request_size;
3579         int buffer_size;
3580         u8 direction;
3581         int rc = 0;
3582
3583         /* If IOA reset is in progress, wait 10 secs for reset to complete */
3584         if (pinstance->ioa_reset_in_progress) {
3585                 rc = wait_event_interruptible_timeout(
3586                                 pinstance->reset_wait_q,
3587                                 !pinstance->ioa_reset_in_progress,
3588                                 msecs_to_jiffies(10000));
3589
3590                 if (!rc)
3591                         return -ETIMEDOUT;
3592                 else if (rc < 0)
3593                         return -ERESTARTSYS;
3594         }
3595
3596         /* If adapter is not in operational state, return error */
3597         if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3598                 pmcraid_err("IOA is not operational\n");
3599                 return -ENOTTY;
3600         }
3601
3602         buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3603         buffer = kmalloc(buffer_size, GFP_KERNEL);
3604
3605         if (!buffer) {
3606                 pmcraid_err("no memory for passthrough buffer\n");
3607                 return -ENOMEM;
3608         }
3609
3610         request_offset =
3611             offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3612
3613         request_buffer = arg + request_offset;
3614
3615         rc = copy_from_user(buffer, arg,
3616                              sizeof(struct pmcraid_passthrough_ioctl_buffer));
3617
3618         ioasa = arg + offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa);
3619
3620         if (rc) {
3621                 pmcraid_err("ioctl: can't copy passthrough buffer\n");
3622                 rc = -EFAULT;
3623                 goto out_free_buffer;
3624         }
3625
3626         request_size = le32_to_cpu(buffer->ioarcb.data_transfer_length);
3627
3628         if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3629                 direction = DMA_TO_DEVICE;
3630         } else {
3631                 direction = DMA_FROM_DEVICE;
3632         }
3633
3634         if (request_size < 0) {
3635                 rc = -EINVAL;
3636                 goto out_free_buffer;
3637         }
3638
3639         /* check if we have any additional command parameters */
3640         if (le16_to_cpu(buffer->ioarcb.add_cmd_param_length)
3641              > PMCRAID_ADD_CMD_PARAM_LEN) {
3642                 rc = -EINVAL;
3643                 goto out_free_buffer;
3644         }
3645
3646         cmd = pmcraid_get_free_cmd(pinstance);
3647
3648         if (!cmd) {
3649                 pmcraid_err("free command block is not available\n");
3650                 rc = -ENOMEM;
3651                 goto out_free_buffer;
3652         }
3653
3654         cmd->scsi_cmd = NULL;
3655         ioarcb = &(cmd->ioa_cb->ioarcb);
3656
3657         /* Copy the user-provided IOARCB stuff field by field */
3658         ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3659         ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3660         ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3661         ioarcb->request_type = buffer->ioarcb.request_type;
3662         ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3663         ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3664         memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3665
3666         if (buffer->ioarcb.add_cmd_param_length) {
3667                 ioarcb->add_cmd_param_length =
3668                         buffer->ioarcb.add_cmd_param_length;
3669                 ioarcb->add_cmd_param_offset =
3670                         buffer->ioarcb.add_cmd_param_offset;
3671                 memcpy(ioarcb->add_data.u.add_cmd_params,
3672                         buffer->ioarcb.add_data.u.add_cmd_params,
3673                         le16_to_cpu(buffer->ioarcb.add_cmd_param_length));
3674         }
3675
3676         /* set hrrq number where the IOA should respond to. Note that all cmds
3677          * generated internally uses hrrq_id 0, exception to this is the cmd
3678          * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3679          * hrrq_id assigned here in queuecommand
3680          */
3681         ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3682                           pinstance->num_hrrq;
3683
3684         if (request_size) {
3685                 rc = pmcraid_build_passthrough_ioadls(cmd,
3686                                                       request_size,
3687                                                       direction);
3688                 if (rc) {
3689                         pmcraid_err("couldn't build passthrough ioadls\n");
3690                         goto out_free_cmd;
3691                 }
3692         }
3693
3694         /* If data is being written into the device, copy the data from user
3695          * buffers
3696          */
3697         if (direction == DMA_TO_DEVICE && request_size > 0) {
3698                 rc = pmcraid_copy_sglist(cmd->sglist,
3699                                          request_buffer,
3700                                          request_size,
3701                                          direction);
3702                 if (rc) {
3703                         pmcraid_err("failed to copy user buffer\n");
3704                         goto out_free_sglist;
3705                 }
3706         }
3707
3708         /* passthrough ioctl is a blocking command so, put the user to sleep
3709          * until timeout. Note that a timeout value of 0 means, do timeout.
3710          */
3711         cmd->cmd_done = pmcraid_internal_done;
3712         init_completion(&cmd->wait_for_completion);
3713         cmd->completion_req = 1;
3714
3715         pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3716                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3717                      cmd->ioa_cb->ioarcb.cdb[0],
3718                      le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3719
3720         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3721         _pmcraid_fire_command(cmd);
3722         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3723
3724         /* NOTE ! Remove the below line once abort_task is implemented
3725          * in firmware. This line disables ioctl command timeout handling logic
3726          * similar to IO command timeout handling, making ioctl commands to wait
3727          * until the command completion regardless of timeout value specified in
3728          * ioarcb
3729          */
3730         buffer->ioarcb.cmd_timeout = 0;
3731
3732         /* If command timeout is specified put caller to wait till that time,
3733          * otherwise it would be blocking wait. If command gets timed out, it
3734          * will be aborted.
3735          */
3736         if (buffer->ioarcb.cmd_timeout == 0) {
3737                 wait_for_completion(&cmd->wait_for_completion);
3738         } else if (!wait_for_completion_timeout(
3739                         &cmd->wait_for_completion,
3740                         msecs_to_jiffies(le16_to_cpu(buffer->ioarcb.cmd_timeout) * 1000))) {
3741
3742                 pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3743                         le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3744                         cmd->ioa_cb->ioarcb.cdb[0]);
3745
3746                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3747                 cancel_cmd = pmcraid_abort_cmd(cmd);
3748                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3749
3750                 if (cancel_cmd) {
3751                         wait_for_completion(&cancel_cmd->wait_for_completion);
3752                         ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
3753                         pmcraid_return_cmd(cancel_cmd);
3754
3755                         /* if abort task couldn't find the command i.e it got
3756                          * completed prior to aborting, return good completion.
3757                          * if command got aborted successfully or there was IOA
3758                          * reset due to abort task itself getting timedout then
3759                          * return -ETIMEDOUT
3760                          */
3761                         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3762                             PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3763                                 if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3764                                         rc = -ETIMEDOUT;
3765                                 goto out_handle_response;
3766                         }
3767                 }
3768
3769                 /* no command block for abort task or abort task failed to abort
3770                  * the IOARCB, then wait for 150 more seconds and initiate reset
3771                  * sequence after timeout
3772                  */
3773                 if (!wait_for_completion_timeout(
3774                         &cmd->wait_for_completion,
3775                         msecs_to_jiffies(150 * 1000))) {
3776                         pmcraid_reset_bringup(cmd->drv_inst);
3777                         rc = -ETIMEDOUT;
3778                 }
3779         }
3780
3781 out_handle_response:
3782         /* copy entire IOASA buffer and return IOCTL success.
3783          * If copying IOASA to user-buffer fails, return
3784          * EFAULT
3785          */
3786         if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3787                 sizeof(struct pmcraid_ioasa))) {
3788                 pmcraid_err("failed to copy ioasa buffer to user\n");
3789                 rc = -EFAULT;
3790         }
3791
3792         /* If the data transfer was from device, copy the data onto user
3793          * buffers
3794          */
3795         else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3796                 rc = pmcraid_copy_sglist(cmd->sglist,
3797                                          request_buffer,
3798                                          request_size,
3799                                          direction);
3800                 if (rc) {
3801                         pmcraid_err("failed to copy user buffer\n");
3802                         rc = -EFAULT;
3803                 }
3804         }
3805
3806 out_free_sglist:
3807         pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3808
3809 out_free_cmd:
3810         pmcraid_return_cmd(cmd);
3811
3812 out_free_buffer:
3813         kfree(buffer);
3814
3815         return rc;
3816 }
3817
3818
3819
3820
3821 /**
3822  * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
3823  *
3824  * @pinstance: pointer to adapter instance structure
3825  * @cmd: ioctl command passed in
3826  * @buflen: length of user_buffer
3827  * @user_buffer: user buffer pointer
3828  *
3829  * Return Value
3830  *   0 in case of success, otherwise appropriate error code
3831  */
3832 static long pmcraid_ioctl_driver(
3833         struct pmcraid_instance *pinstance,
3834         unsigned int cmd,
3835         unsigned int buflen,
3836         void __user *user_buffer
3837 )
3838 {
3839         int rc = -ENOSYS;
3840
3841         switch (cmd) {
3842         case PMCRAID_IOCTL_RESET_ADAPTER:
3843                 pmcraid_reset_bringup(pinstance);
3844                 rc = 0;
3845                 break;
3846
3847         default:
3848                 break;
3849         }
3850
3851         return rc;
3852 }
3853
3854 /**
3855  * pmcraid_check_ioctl_buffer - check for proper access to user buffer
3856  *
3857  * @cmd: ioctl command
3858  * @arg: user buffer
3859  * @hdr: pointer to kernel memory for pmcraid_ioctl_header
3860  *
3861  * Return Value
3862  *      negetive error code if there are access issues, otherwise zero.
3863  *      Upon success, returns ioctl header copied out of user buffer.
3864  */
3865
3866 static int pmcraid_check_ioctl_buffer(
3867         int cmd,
3868         void __user *arg,
3869         struct pmcraid_ioctl_header *hdr
3870 )
3871 {
3872         int rc;
3873
3874         if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
3875                 pmcraid_err("couldn't copy ioctl header from user buffer\n");
3876                 return -EFAULT;
3877         }
3878
3879         /* check for valid driver signature */
3880         rc = memcmp(hdr->signature,
3881                     PMCRAID_IOCTL_SIGNATURE,
3882                     sizeof(hdr->signature));
3883         if (rc) {
3884                 pmcraid_err("signature verification failed\n");
3885                 return -EINVAL;
3886         }
3887
3888         return 0;
3889 }
3890
3891 /*
3892  *  pmcraid_ioctl - char node ioctl entry point
3893  */
3894 static long pmcraid_chr_ioctl(
3895         struct file *filep,
3896         unsigned int cmd,
3897         unsigned long arg
3898 )
3899 {
3900         struct pmcraid_instance *pinstance = NULL;
3901         struct pmcraid_ioctl_header *hdr = NULL;
3902         void __user *argp = (void __user *)arg;
3903         int retval = -ENOTTY;
3904
3905         hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
3906
3907         if (!hdr) {
3908                 pmcraid_err("failed to allocate memory for ioctl header\n");
3909                 return -ENOMEM;
3910         }
3911
3912         retval = pmcraid_check_ioctl_buffer(cmd, argp, hdr);
3913
3914         if (retval) {
3915                 pmcraid_info("chr_ioctl: header check failed\n");
3916                 kfree(hdr);
3917                 return retval;
3918         }
3919
3920         pinstance = filep->private_data;
3921
3922         if (!pinstance) {
3923                 pmcraid_info("adapter instance is not found\n");
3924                 kfree(hdr);
3925                 return -ENOTTY;
3926         }
3927
3928         switch (_IOC_TYPE(cmd)) {
3929
3930         case PMCRAID_PASSTHROUGH_IOCTL:
3931                 /* If ioctl code is to download microcode, we need to block
3932                  * mid-layer requests.
3933                  */
3934                 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
3935                         scsi_block_requests(pinstance->host);
3936
3937                 retval = pmcraid_ioctl_passthrough(pinstance, cmd,
3938                                                    hdr->buffer_length, argp);
3939
3940                 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
3941                         scsi_unblock_requests(pinstance->host);
3942                 break;
3943
3944         case PMCRAID_DRIVER_IOCTL:
3945                 arg += sizeof(struct pmcraid_ioctl_header);
3946                 retval = pmcraid_ioctl_driver(pinstance, cmd,
3947                                               hdr->buffer_length, argp);
3948                 break;
3949
3950         default:
3951                 retval = -ENOTTY;
3952                 break;
3953         }
3954
3955         kfree(hdr);
3956
3957         return retval;
3958 }
3959
3960 /*
3961  * File operations structure for management interface
3962  */
3963 static const struct file_operations pmcraid_fops = {
3964         .owner = THIS_MODULE,
3965         .open = pmcraid_chr_open,
3966         .fasync = pmcraid_chr_fasync,
3967         .unlocked_ioctl = pmcraid_chr_ioctl,
3968         .compat_ioctl = compat_ptr_ioctl,
3969         .llseek = noop_llseek,
3970 };
3971
3972
3973
3974
3975 /**
3976  * pmcraid_show_log_level - Display adapter's error logging level
3977  * @dev: class device struct
3978  * @attr: unused
3979  * @buf: buffer
3980  *
3981  * Return value:
3982  *  number of bytes printed to buffer
3983  */
3984 static ssize_t pmcraid_show_log_level(
3985         struct device *dev,
3986         struct device_attribute *attr,
3987         char *buf)
3988 {
3989         struct Scsi_Host *shost = class_to_shost(dev);
3990         struct pmcraid_instance *pinstance =
3991                 (struct pmcraid_instance *)shost->hostdata;
3992         return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
3993 }
3994
3995 /**
3996  * pmcraid_store_log_level - Change the adapter's error logging level
3997  * @dev: class device struct
3998  * @attr: unused
3999  * @buf: buffer
4000  * @count: not used
4001  *
4002  * Return value:
4003  *  number of bytes printed to buffer
4004  */
4005 static ssize_t pmcraid_store_log_level(
4006         struct device *dev,
4007         struct device_attribute *attr,
4008         const char *buf,
4009         size_t count
4010 )
4011 {
4012         struct Scsi_Host *shost;
4013         struct pmcraid_instance *pinstance;
4014         u8 val;
4015
4016         if (kstrtou8(buf, 10, &val))
4017                 return -EINVAL;
4018         /* log-level should be from 0 to 2 */
4019         if (val > 2)
4020                 return -EINVAL;
4021
4022         shost = class_to_shost(dev);
4023         pinstance = (struct pmcraid_instance *)shost->hostdata;
4024         pinstance->current_log_level = val;
4025
4026         return strlen(buf);
4027 }
4028
4029 static struct device_attribute pmcraid_log_level_attr = {
4030         .attr = {
4031                  .name = "log_level",
4032                  .mode = S_IRUGO | S_IWUSR,
4033                  },
4034         .show = pmcraid_show_log_level,
4035         .store = pmcraid_store_log_level,
4036 };
4037
4038 /**
4039  * pmcraid_show_drv_version - Display driver version
4040  * @dev: class device struct
4041  * @attr: unused
4042  * @buf: buffer
4043  *
4044  * Return value:
4045  *  number of bytes printed to buffer
4046  */
4047 static ssize_t pmcraid_show_drv_version(
4048         struct device *dev,
4049         struct device_attribute *attr,
4050         char *buf
4051 )
4052 {
4053         return snprintf(buf, PAGE_SIZE, "version: %s\n",
4054                         PMCRAID_DRIVER_VERSION);
4055 }
4056
4057 static struct device_attribute pmcraid_driver_version_attr = {
4058         .attr = {
4059                  .name = "drv_version",
4060                  .mode = S_IRUGO,
4061                  },
4062         .show = pmcraid_show_drv_version,
4063 };
4064
4065 /**
4066  * pmcraid_show_adapter_id - Display driver assigned adapter id
4067  * @dev: class device struct
4068  * @attr: unused
4069  * @buf: buffer
4070  *
4071  * Return value:
4072  *  number of bytes printed to buffer
4073  */
4074 static ssize_t pmcraid_show_adapter_id(
4075         struct device *dev,
4076         struct device_attribute *attr,
4077         char *buf
4078 )
4079 {
4080         struct Scsi_Host *shost = class_to_shost(dev);
4081         struct pmcraid_instance *pinstance =
4082                 (struct pmcraid_instance *)shost->hostdata;
4083         u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4084                 pinstance->pdev->devfn;
4085         u32 aen_group = pmcraid_event_family.id;
4086
4087         return snprintf(buf, PAGE_SIZE,
4088                         "adapter id: %d\nminor: %d\naen group: %d\n",
4089                         adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4090 }
4091
4092 static struct device_attribute pmcraid_adapter_id_attr = {
4093         .attr = {
4094                  .name = "adapter_id",
4095                  .mode = S_IRUGO,
4096                  },
4097         .show = pmcraid_show_adapter_id,
4098 };
4099
4100 static struct device_attribute *pmcraid_host_attrs[] = {
4101         &pmcraid_log_level_attr,
4102         &pmcraid_driver_version_attr,
4103         &pmcraid_adapter_id_attr,
4104         NULL,
4105 };
4106
4107
4108 /* host template structure for pmcraid driver */
4109 static struct scsi_host_template pmcraid_host_template = {
4110         .module = THIS_MODULE,
4111         .name = PMCRAID_DRIVER_NAME,
4112         .queuecommand = pmcraid_queuecommand,
4113         .eh_abort_handler = pmcraid_eh_abort_handler,
4114         .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4115         .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4116         .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4117         .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4118
4119         .slave_alloc = pmcraid_slave_alloc,
4120         .slave_configure = pmcraid_slave_configure,
4121         .slave_destroy = pmcraid_slave_destroy,
4122         .change_queue_depth = pmcraid_change_queue_depth,
4123         .can_queue = PMCRAID_MAX_IO_CMD,
4124         .this_id = -1,
4125         .sg_tablesize = PMCRAID_MAX_IOADLS,
4126         .max_sectors = PMCRAID_IOA_MAX_SECTORS,
4127         .no_write_same = 1,
4128         .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4129         .shost_attrs = pmcraid_host_attrs,
4130         .proc_name = PMCRAID_DRIVER_NAME,
4131 };
4132
4133 /*
4134  * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4135  * @irq: interrupt vector number
4136  * @dev_id: pointer hrrq_vector
4137  *
4138  * Return Value
4139  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4140  */
4141
4142 static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4143 {
4144         struct pmcraid_isr_param *hrrq_vector;
4145         struct pmcraid_instance *pinstance;
4146         unsigned long lock_flags;
4147         u32 intrs_val;
4148         int hrrq_id;
4149
4150         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4151         hrrq_id = hrrq_vector->hrrq_id;
4152         pinstance = hrrq_vector->drv_inst;
4153
4154         if (!hrrq_id) {
4155                 /* Read the interrupt */
4156                 intrs_val = pmcraid_read_interrupts(pinstance);
4157                 if (intrs_val &&
4158                         ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4159                         & DOORBELL_INTR_MSIX_CLR) == 0)) {
4160                         /* Any error interrupts including unit_check,
4161                          * initiate IOA reset.In case of unit check indicate
4162                          * to reset_sequence that IOA unit checked and prepare
4163                          * for a dump during reset sequence
4164                          */
4165                         if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4166                                 if (intrs_val & INTRS_IOA_UNIT_CHECK)
4167                                         pinstance->ioa_unit_check = 1;
4168
4169                                 pmcraid_err("ISR: error interrupts: %x \
4170                                         initiating reset\n", intrs_val);
4171                                 spin_lock_irqsave(pinstance->host->host_lock,
4172                                         lock_flags);
4173                                 pmcraid_initiate_reset(pinstance);
4174                                 spin_unlock_irqrestore(
4175                                         pinstance->host->host_lock,
4176                                         lock_flags);
4177                         }
4178                         /* If interrupt was as part of the ioa initialization,
4179                          * clear it. Delete the timer and wakeup the
4180                          * reset engine to proceed with reset sequence
4181                          */
4182                         if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4183                                 pmcraid_clr_trans_op(pinstance);
4184
4185                         /* Clear the interrupt register by writing
4186                          * to host to ioa doorbell. Once done
4187                          * FW will clear the interrupt.
4188                          */
4189                         iowrite32(DOORBELL_INTR_MSIX_CLR,
4190                                 pinstance->int_regs.host_ioa_interrupt_reg);
4191                         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4192
4193
4194                 }
4195         }
4196
4197         tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4198
4199         return IRQ_HANDLED;
4200 }
4201
4202 /**
4203  * pmcraid_isr  - implements legacy interrupt handling routine
4204  *
4205  * @irq: interrupt vector number
4206  * @dev_id: pointer hrrq_vector
4207  *
4208  * Return Value
4209  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4210  */
4211 static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4212 {
4213         struct pmcraid_isr_param *hrrq_vector;
4214         struct pmcraid_instance *pinstance;
4215         u32 intrs;
4216         unsigned long lock_flags;
4217         int hrrq_id = 0;
4218
4219         /* In case of legacy interrupt mode where interrupts are shared across
4220          * isrs, it may be possible that the current interrupt is not from IOA
4221          */
4222         if (!dev_id) {
4223                 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4224                 return IRQ_NONE;
4225         }
4226         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4227         pinstance = hrrq_vector->drv_inst;
4228
4229         intrs = pmcraid_read_interrupts(pinstance);
4230
4231         if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4232                 return IRQ_NONE;
4233
4234         /* Any error interrupts including unit_check, initiate IOA reset.
4235          * In case of unit check indicate to reset_sequence that IOA unit
4236          * checked and prepare for a dump during reset sequence
4237          */
4238         if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4239
4240                 if (intrs & INTRS_IOA_UNIT_CHECK)
4241                         pinstance->ioa_unit_check = 1;
4242
4243                 iowrite32(intrs,
4244                           pinstance->int_regs.ioa_host_interrupt_clr_reg);
4245                 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4246                             intrs);
4247                 intrs = ioread32(
4248                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4249                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4250                 pmcraid_initiate_reset(pinstance);
4251                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4252         } else {
4253                 /* If interrupt was as part of the ioa initialization,
4254                  * clear. Delete the timer and wakeup the
4255                  * reset engine to proceed with reset sequence
4256                  */
4257                 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4258                         pmcraid_clr_trans_op(pinstance);
4259                 } else {
4260                         iowrite32(intrs,
4261                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4262                         ioread32(
4263                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4264
4265                         tasklet_schedule(
4266                                         &(pinstance->isr_tasklet[hrrq_id]));
4267                 }
4268         }
4269
4270         return IRQ_HANDLED;
4271 }
4272
4273
4274 /**
4275  * pmcraid_worker_function -  worker thread function
4276  *
4277  * @workp: pointer to struct work queue
4278  *
4279  * Return Value
4280  *       None
4281  */
4282
4283 static void pmcraid_worker_function(struct work_struct *workp)
4284 {
4285         struct pmcraid_instance *pinstance;
4286         struct pmcraid_resource_entry *res;
4287         struct pmcraid_resource_entry *temp;
4288         struct scsi_device *sdev;
4289         unsigned long lock_flags;
4290         unsigned long host_lock_flags;
4291         u16 fw_version;
4292         u8 bus, target, lun;
4293
4294         pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4295         /* add resources only after host is added into system */
4296         if (!atomic_read(&pinstance->expose_resources))
4297                 return;
4298
4299         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4300
4301         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4302         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4303
4304                 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4305                         sdev = res->scsi_dev;
4306
4307                         /* host_lock must be held before calling
4308                          * scsi_device_get
4309                          */
4310                         spin_lock_irqsave(pinstance->host->host_lock,
4311                                           host_lock_flags);
4312                         if (!scsi_device_get(sdev)) {
4313                                 spin_unlock_irqrestore(
4314                                                 pinstance->host->host_lock,
4315                                                 host_lock_flags);
4316                                 pmcraid_info("deleting %x from midlayer\n",
4317                                              res->cfg_entry.resource_address);
4318                                 list_move_tail(&res->queue,
4319                                                 &pinstance->free_res_q);
4320                                 spin_unlock_irqrestore(
4321                                         &pinstance->resource_lock,
4322                                         lock_flags);
4323                                 scsi_remove_device(sdev);
4324                                 scsi_device_put(sdev);
4325                                 spin_lock_irqsave(&pinstance->resource_lock,
4326                                                    lock_flags);
4327                                 res->change_detected = 0;
4328                         } else {
4329                                 spin_unlock_irqrestore(
4330                                                 pinstance->host->host_lock,
4331                                                 host_lock_flags);
4332                         }
4333                 }
4334         }
4335
4336         list_for_each_entry(res, &pinstance->used_res_q, queue) {
4337
4338                 if (res->change_detected == RES_CHANGE_ADD) {
4339
4340                         if (!pmcraid_expose_resource(fw_version,
4341                                                      &res->cfg_entry))
4342                                 continue;
4343
4344                         if (RES_IS_VSET(res->cfg_entry)) {
4345                                 bus = PMCRAID_VSET_BUS_ID;
4346                                 if (fw_version <= PMCRAID_FW_VERSION_1)
4347                                         target = res->cfg_entry.unique_flags1;
4348                                 else
4349                                         target = le16_to_cpu(res->cfg_entry.array_id) & 0xFF;
4350                                 lun = PMCRAID_VSET_LUN_ID;
4351                         } else {
4352                                 bus = PMCRAID_PHYS_BUS_ID;
4353                                 target =
4354                                      RES_TARGET(
4355                                         res->cfg_entry.resource_address);
4356                                 lun = RES_LUN(res->cfg_entry.resource_address);
4357                         }
4358
4359                         res->change_detected = 0;
4360                         spin_unlock_irqrestore(&pinstance->resource_lock,
4361                                                 lock_flags);
4362                         scsi_add_device(pinstance->host, bus, target, lun);
4363                         spin_lock_irqsave(&pinstance->resource_lock,
4364                                            lock_flags);
4365                 }
4366         }
4367
4368         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4369 }
4370
4371 /**
4372  * pmcraid_tasklet_function - Tasklet function
4373  *
4374  * @instance: pointer to msix param structure
4375  *
4376  * Return Value
4377  *      None
4378  */
4379 static void pmcraid_tasklet_function(unsigned long instance)
4380 {
4381         struct pmcraid_isr_param *hrrq_vector;
4382         struct pmcraid_instance *pinstance;
4383         unsigned long hrrq_lock_flags;
4384         unsigned long pending_lock_flags;
4385         unsigned long host_lock_flags;
4386         spinlock_t *lockp; /* hrrq buffer lock */
4387         int id;
4388         u32 resp;
4389
4390         hrrq_vector = (struct pmcraid_isr_param *)instance;
4391         pinstance = hrrq_vector->drv_inst;
4392         id = hrrq_vector->hrrq_id;
4393         lockp = &(pinstance->hrrq_lock[id]);
4394
4395         /* loop through each of the commands responded by IOA. Each HRRQ buf is
4396          * protected by its own lock. Traversals must be done within this lock
4397          * as there may be multiple tasklets running on multiple CPUs. Note
4398          * that the lock is held just for picking up the response handle and
4399          * manipulating hrrq_curr/toggle_bit values.
4400          */
4401         spin_lock_irqsave(lockp, hrrq_lock_flags);
4402
4403         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4404
4405         while ((resp & HRRQ_TOGGLE_BIT) ==
4406                 pinstance->host_toggle_bit[id]) {
4407
4408                 int cmd_index = resp >> 2;
4409                 struct pmcraid_cmd *cmd = NULL;
4410
4411                 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4412                         pinstance->hrrq_curr[id]++;
4413                 } else {
4414                         pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4415                         pinstance->host_toggle_bit[id] ^= 1u;
4416                 }
4417
4418                 if (cmd_index >= PMCRAID_MAX_CMD) {
4419                         /* In case of invalid response handle, log message */
4420                         pmcraid_err("Invalid response handle %d\n", cmd_index);
4421                         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4422                         continue;
4423                 }
4424
4425                 cmd = pinstance->cmd_list[cmd_index];
4426                 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4427
4428                 spin_lock_irqsave(&pinstance->pending_pool_lock,
4429                                    pending_lock_flags);
4430                 list_del(&cmd->free_list);
4431                 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4432                                         pending_lock_flags);
4433                 del_timer(&cmd->timer);
4434                 atomic_dec(&pinstance->outstanding_cmds);
4435
4436                 if (cmd->cmd_done == pmcraid_ioa_reset) {
4437                         spin_lock_irqsave(pinstance->host->host_lock,
4438                                           host_lock_flags);
4439                         cmd->cmd_done(cmd);
4440                         spin_unlock_irqrestore(pinstance->host->host_lock,
4441                                                host_lock_flags);
4442                 } else if (cmd->cmd_done != NULL) {
4443                         cmd->cmd_done(cmd);
4444                 }
4445                 /* loop over until we are done with all responses */
4446                 spin_lock_irqsave(lockp, hrrq_lock_flags);
4447                 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4448         }
4449
4450         spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4451 }
4452
4453 /**
4454  * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4455  * @pinstance: pointer to adapter instance structure
4456  *
4457  * This routine un-registers registered interrupt handler and
4458  * also frees irqs/vectors.
4459  *
4460  * Retun Value
4461  *      None
4462  */
4463 static
4464 void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4465 {
4466         struct pci_dev *pdev = pinstance->pdev;
4467         int i;
4468
4469         for (i = 0; i < pinstance->num_hrrq; i++)
4470                 free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
4471
4472         pinstance->interrupt_mode = 0;
4473         pci_free_irq_vectors(pdev);
4474 }
4475
4476 /**
4477  * pmcraid_register_interrupt_handler - registers interrupt handler
4478  * @pinstance: pointer to per-adapter instance structure
4479  *
4480  * Return Value
4481  *      0 on success, non-zero error code otherwise.
4482  */
4483 static int
4484 pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4485 {
4486         struct pci_dev *pdev = pinstance->pdev;
4487         unsigned int irq_flag = PCI_IRQ_LEGACY, flag;
4488         int num_hrrq, rc, i;
4489         irq_handler_t isr;
4490
4491         if (pmcraid_enable_msix)
4492                 irq_flag |= PCI_IRQ_MSIX;
4493
4494         num_hrrq = pci_alloc_irq_vectors(pdev, 1, PMCRAID_NUM_MSIX_VECTORS,
4495                         irq_flag);
4496         if (num_hrrq < 0)
4497                 return num_hrrq;
4498
4499         if (pdev->msix_enabled) {
4500                 flag = 0;
4501                 isr = pmcraid_isr_msix;
4502         } else {
4503                 flag = IRQF_SHARED;
4504                 isr = pmcraid_isr;
4505         }
4506
4507         for (i = 0; i < num_hrrq; i++) {
4508                 struct pmcraid_isr_param *vec = &pinstance->hrrq_vector[i];
4509
4510                 vec->hrrq_id = i;
4511                 vec->drv_inst = pinstance;
4512                 rc = request_irq(pci_irq_vector(pdev, i), isr, flag,
4513                                 PMCRAID_DRIVER_NAME, vec);
4514                 if (rc)
4515                         goto out_unwind;
4516         }
4517
4518         pinstance->num_hrrq = num_hrrq;
4519         if (pdev->msix_enabled) {
4520                 pinstance->interrupt_mode = 1;
4521                 iowrite32(DOORBELL_INTR_MODE_MSIX,
4522                           pinstance->int_regs.host_ioa_interrupt_reg);
4523                 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4524         }
4525
4526         return 0;
4527
4528 out_unwind:
4529         while (--i > 0)
4530                 free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
4531         pci_free_irq_vectors(pdev);
4532         return rc;
4533 }
4534
4535 /**
4536  * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4537  * @pinstance: per adapter instance structure pointer
4538  * @max_index: number of buffer blocks to release
4539  *
4540  * Return Value
4541  *  None
4542  */
4543 static void
4544 pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4545 {
4546         int i;
4547         for (i = 0; i < max_index; i++) {
4548                 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4549                 pinstance->cmd_list[i] = NULL;
4550         }
4551         kmem_cache_destroy(pinstance->cmd_cachep);
4552         pinstance->cmd_cachep = NULL;
4553 }
4554
4555 /**
4556  * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4557  * @pinstance: pointer to per adapter instance structure
4558  * @max_index: number of buffers (from 0 onwards) to release
4559  *
4560  * This function assumes that the command blocks for which control blocks are
4561  * linked are not released.
4562  *
4563  * Return Value
4564  *       None
4565  */
4566 static void
4567 pmcraid_release_control_blocks(
4568         struct pmcraid_instance *pinstance,
4569         int max_index
4570 )
4571 {
4572         int i;
4573
4574         if (pinstance->control_pool == NULL)
4575                 return;
4576
4577         for (i = 0; i < max_index; i++) {
4578                 dma_pool_free(pinstance->control_pool,
4579                               pinstance->cmd_list[i]->ioa_cb,
4580                               pinstance->cmd_list[i]->ioa_cb_bus_addr);
4581                 pinstance->cmd_list[i]->ioa_cb = NULL;
4582                 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4583         }
4584         dma_pool_destroy(pinstance->control_pool);
4585         pinstance->control_pool = NULL;
4586 }
4587
4588 /**
4589  * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4590  * @pinstance: pointer to per adapter instance structure
4591  *
4592  * Allocates memory for command blocks using kernel slab allocator.
4593  *
4594  * Return Value
4595  *      0 in case of success; -ENOMEM in case of failure
4596  */
4597 static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4598 {
4599         int i;
4600
4601         sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4602                 pinstance->host->unique_id);
4603
4604
4605         pinstance->cmd_cachep = kmem_cache_create(
4606                                         pinstance->cmd_pool_name,
4607                                         sizeof(struct pmcraid_cmd), 0,
4608                                         SLAB_HWCACHE_ALIGN, NULL);
4609         if (!pinstance->cmd_cachep)
4610                 return -ENOMEM;
4611
4612         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4613                 pinstance->cmd_list[i] =
4614                         kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4615                 if (!pinstance->cmd_list[i]) {
4616                         pmcraid_release_cmd_blocks(pinstance, i);
4617                         return -ENOMEM;
4618                 }
4619         }
4620         return 0;
4621 }
4622
4623 /**
4624  * pmcraid_allocate_control_blocks - allocates memory control blocks
4625  * @pinstance : pointer to per adapter instance structure
4626  *
4627  * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4628  * and IOASAs. This is called after command blocks are already allocated.
4629  *
4630  * Return Value
4631  *  0 in case it can allocate all control blocks, otherwise -ENOMEM
4632  */
4633 static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4634 {
4635         int i;
4636
4637         sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4638                 pinstance->host->unique_id);
4639
4640         pinstance->control_pool =
4641                 dma_pool_create(pinstance->ctl_pool_name,
4642                                 &pinstance->pdev->dev,
4643                                 sizeof(struct pmcraid_control_block),
4644                                 PMCRAID_IOARCB_ALIGNMENT, 0);
4645
4646         if (!pinstance->control_pool)
4647                 return -ENOMEM;
4648
4649         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4650                 pinstance->cmd_list[i]->ioa_cb =
4651                         dma_pool_zalloc(
4652                                 pinstance->control_pool,
4653                                 GFP_KERNEL,
4654                                 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4655
4656                 if (!pinstance->cmd_list[i]->ioa_cb) {
4657                         pmcraid_release_control_blocks(pinstance, i);
4658                         return -ENOMEM;
4659                 }
4660         }
4661         return 0;
4662 }
4663
4664 /**
4665  * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4666  * @pinstance: pointer to per adapter instance structure
4667  * @maxindex: size of hrrq buffer pointer array
4668  *
4669  * Return Value
4670  *      None
4671  */
4672 static void
4673 pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4674 {
4675         int i;
4676
4677         for (i = 0; i < maxindex; i++) {
4678                 dma_free_coherent(&pinstance->pdev->dev,
4679                                     HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4680                                     pinstance->hrrq_start[i],
4681                                     pinstance->hrrq_start_bus_addr[i]);
4682
4683                 /* reset pointers and toggle bit to zeros */
4684                 pinstance->hrrq_start[i] = NULL;
4685                 pinstance->hrrq_start_bus_addr[i] = 0;
4686                 pinstance->host_toggle_bit[i] = 0;
4687         }
4688 }
4689
4690 /**
4691  * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4692  * @pinstance: pointer to per adapter instance structure
4693  *
4694  * Return value
4695  *      0 hrrq buffers are allocated, -ENOMEM otherwise.
4696  */
4697 static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4698 {
4699         int i, buffer_size;
4700
4701         buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4702
4703         for (i = 0; i < pinstance->num_hrrq; i++) {
4704                 pinstance->hrrq_start[i] =
4705                         dma_alloc_coherent(&pinstance->pdev->dev, buffer_size,
4706                                            &pinstance->hrrq_start_bus_addr[i],
4707                                            GFP_KERNEL);
4708                 if (!pinstance->hrrq_start[i]) {
4709                         pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4710                                     i);
4711                         pmcraid_release_host_rrqs(pinstance, i);
4712                         return -ENOMEM;
4713                 }
4714
4715                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4716                 pinstance->hrrq_end[i] =
4717                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4718                 pinstance->host_toggle_bit[i] = 1;
4719                 spin_lock_init(&pinstance->hrrq_lock[i]);
4720         }
4721         return 0;
4722 }
4723
4724 /**
4725  * pmcraid_release_hcams - release HCAM buffers
4726  *
4727  * @pinstance: pointer to per adapter instance structure
4728  *
4729  * Return value
4730  *  none
4731  */
4732 static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4733 {
4734         if (pinstance->ccn.msg != NULL) {
4735                 dma_free_coherent(&pinstance->pdev->dev,
4736                                     PMCRAID_AEN_HDR_SIZE +
4737                                     sizeof(struct pmcraid_hcam_ccn_ext),
4738                                     pinstance->ccn.msg,
4739                                     pinstance->ccn.baddr);
4740
4741                 pinstance->ccn.msg = NULL;
4742                 pinstance->ccn.hcam = NULL;
4743                 pinstance->ccn.baddr = 0;
4744         }
4745
4746         if (pinstance->ldn.msg != NULL) {
4747                 dma_free_coherent(&pinstance->pdev->dev,
4748                                     PMCRAID_AEN_HDR_SIZE +
4749                                     sizeof(struct pmcraid_hcam_ldn),
4750                                     pinstance->ldn.msg,
4751                                     pinstance->ldn.baddr);
4752
4753                 pinstance->ldn.msg = NULL;
4754                 pinstance->ldn.hcam = NULL;
4755                 pinstance->ldn.baddr = 0;
4756         }
4757 }
4758
4759 /**
4760  * pmcraid_allocate_hcams - allocates HCAM buffers
4761  * @pinstance : pointer to per adapter instance structure
4762  *
4763  * Return Value:
4764  *   0 in case of successful allocation, non-zero otherwise
4765  */
4766 static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4767 {
4768         pinstance->ccn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
4769                                         PMCRAID_AEN_HDR_SIZE +
4770                                         sizeof(struct pmcraid_hcam_ccn_ext),
4771                                         &pinstance->ccn.baddr, GFP_KERNEL);
4772
4773         pinstance->ldn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
4774                                         PMCRAID_AEN_HDR_SIZE +
4775                                         sizeof(struct pmcraid_hcam_ldn),
4776                                         &pinstance->ldn.baddr, GFP_KERNEL);
4777
4778         if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
4779                 pmcraid_release_hcams(pinstance);
4780         } else {
4781                 pinstance->ccn.hcam =
4782                         (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
4783                 pinstance->ldn.hcam =
4784                         (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
4785
4786                 atomic_set(&pinstance->ccn.ignore, 0);
4787                 atomic_set(&pinstance->ldn.ignore, 0);
4788         }
4789
4790         return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
4791 }
4792
4793 /**
4794  * pmcraid_release_config_buffers - release config.table buffers
4795  * @pinstance: pointer to per adapter instance structure
4796  *
4797  * Return Value
4798  *       none
4799  */
4800 static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
4801 {
4802         if (pinstance->cfg_table != NULL &&
4803             pinstance->cfg_table_bus_addr != 0) {
4804                 dma_free_coherent(&pinstance->pdev->dev,
4805                                     sizeof(struct pmcraid_config_table),
4806                                     pinstance->cfg_table,
4807                                     pinstance->cfg_table_bus_addr);
4808                 pinstance->cfg_table = NULL;
4809                 pinstance->cfg_table_bus_addr = 0;
4810         }
4811
4812         if (pinstance->res_entries != NULL) {
4813                 int i;
4814
4815                 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4816                         list_del(&pinstance->res_entries[i].queue);
4817                 kfree(pinstance->res_entries);
4818                 pinstance->res_entries = NULL;
4819         }
4820
4821         pmcraid_release_hcams(pinstance);
4822 }
4823
4824 /**
4825  * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
4826  * @pinstance : pointer to per adapter instance structure
4827  *
4828  * Return Value
4829  *      0 for successful allocation, -ENOMEM for any failure
4830  */
4831 static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
4832 {
4833         int i;
4834
4835         pinstance->res_entries =
4836                         kcalloc(PMCRAID_MAX_RESOURCES,
4837                                 sizeof(struct pmcraid_resource_entry),
4838                                 GFP_KERNEL);
4839
4840         if (NULL == pinstance->res_entries) {
4841                 pmcraid_err("failed to allocate memory for resource table\n");
4842                 return -ENOMEM;
4843         }
4844
4845         for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4846                 list_add_tail(&pinstance->res_entries[i].queue,
4847                               &pinstance->free_res_q);
4848
4849         pinstance->cfg_table = dma_alloc_coherent(&pinstance->pdev->dev,
4850                                      sizeof(struct pmcraid_config_table),
4851                                      &pinstance->cfg_table_bus_addr,
4852                                      GFP_KERNEL);
4853
4854         if (NULL == pinstance->cfg_table) {
4855                 pmcraid_err("couldn't alloc DMA memory for config table\n");
4856                 pmcraid_release_config_buffers(pinstance);
4857                 return -ENOMEM;
4858         }
4859
4860         if (pmcraid_allocate_hcams(pinstance)) {
4861                 pmcraid_err("could not alloc DMA memory for HCAMS\n");
4862                 pmcraid_release_config_buffers(pinstance);
4863                 return -ENOMEM;
4864         }
4865
4866         return 0;
4867 }
4868
4869 /**
4870  * pmcraid_init_tasklets - registers tasklets for response handling
4871  *
4872  * @pinstance: pointer adapter instance structure
4873  *
4874  * Return value
4875  *      none
4876  */
4877 static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
4878 {
4879         int i;
4880         for (i = 0; i < pinstance->num_hrrq; i++)
4881                 tasklet_init(&pinstance->isr_tasklet[i],
4882                              pmcraid_tasklet_function,
4883                              (unsigned long)&pinstance->hrrq_vector[i]);
4884 }
4885
4886 /**
4887  * pmcraid_kill_tasklets - destroys tasklets registered for response handling
4888  *
4889  * @pinstance: pointer to adapter instance structure
4890  *
4891  * Return value
4892  *      none
4893  */
4894 static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
4895 {
4896         int i;
4897         for (i = 0; i < pinstance->num_hrrq; i++)
4898                 tasklet_kill(&pinstance->isr_tasklet[i]);
4899 }
4900
4901 /**
4902  * pmcraid_release_buffers - release per-adapter buffers allocated
4903  *
4904  * @pinstance: pointer to adapter soft state
4905  *
4906  * Return Value
4907  *      none
4908  */
4909 static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
4910 {
4911         pmcraid_release_config_buffers(pinstance);
4912         pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
4913         pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
4914         pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4915
4916         if (pinstance->inq_data != NULL) {
4917                 dma_free_coherent(&pinstance->pdev->dev,
4918                                     sizeof(struct pmcraid_inquiry_data),
4919                                     pinstance->inq_data,
4920                                     pinstance->inq_data_baddr);
4921
4922                 pinstance->inq_data = NULL;
4923                 pinstance->inq_data_baddr = 0;
4924         }
4925
4926         if (pinstance->timestamp_data != NULL) {
4927                 dma_free_coherent(&pinstance->pdev->dev,
4928                                     sizeof(struct pmcraid_timestamp_data),
4929                                     pinstance->timestamp_data,
4930                                     pinstance->timestamp_data_baddr);
4931
4932                 pinstance->timestamp_data = NULL;
4933                 pinstance->timestamp_data_baddr = 0;
4934         }
4935 }
4936
4937 /**
4938  * pmcraid_init_buffers - allocates memory and initializes various structures
4939  * @pinstance: pointer to per adapter instance structure
4940  *
4941  * This routine pre-allocates memory based on the type of block as below:
4942  * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
4943  * IOARCBs(PMCRAID_MAX_CMD)  : DMAable memory, using pci pool allocator
4944  * config-table entries      : DMAable memory using dma_alloc_coherent
4945  * HostRRQs                  : DMAable memory, using dma_alloc_coherent
4946  *
4947  * Return Value
4948  *       0 in case all of the blocks are allocated, -ENOMEM otherwise.
4949  */
4950 static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
4951 {
4952         int i;
4953
4954         if (pmcraid_allocate_host_rrqs(pinstance)) {
4955                 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
4956                              pinstance->num_hrrq);
4957                 return -ENOMEM;
4958         }
4959
4960         if (pmcraid_allocate_config_buffers(pinstance)) {
4961                 pmcraid_err("couldn't allocate memory for config buffers\n");
4962                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4963                 return -ENOMEM;
4964         }
4965
4966         if (pmcraid_allocate_cmd_blocks(pinstance)) {
4967                 pmcraid_err("couldn't allocate memory for cmd blocks\n");
4968                 pmcraid_release_config_buffers(pinstance);
4969                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4970                 return -ENOMEM;
4971         }
4972
4973         if (pmcraid_allocate_control_blocks(pinstance)) {
4974                 pmcraid_err("couldn't allocate memory control blocks\n");
4975                 pmcraid_release_config_buffers(pinstance);
4976                 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
4977                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4978                 return -ENOMEM;
4979         }
4980
4981         /* allocate DMAable memory for page D0 INQUIRY buffer */
4982         pinstance->inq_data = dma_alloc_coherent(&pinstance->pdev->dev,
4983                                         sizeof(struct pmcraid_inquiry_data),
4984                                         &pinstance->inq_data_baddr, GFP_KERNEL);
4985         if (pinstance->inq_data == NULL) {
4986                 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
4987                 pmcraid_release_buffers(pinstance);
4988                 return -ENOMEM;
4989         }
4990
4991         /* allocate DMAable memory for set timestamp data buffer */
4992         pinstance->timestamp_data = dma_alloc_coherent(&pinstance->pdev->dev,
4993                                         sizeof(struct pmcraid_timestamp_data),
4994                                         &pinstance->timestamp_data_baddr,
4995                                         GFP_KERNEL);
4996         if (pinstance->timestamp_data == NULL) {
4997                 pmcraid_err("couldn't allocate DMA memory for \
4998                                 set time_stamp \n");
4999                 pmcraid_release_buffers(pinstance);
5000                 return -ENOMEM;
5001         }
5002
5003
5004         /* Initialize all the command blocks and add them to free pool. No
5005          * need to lock (free_pool_lock) as this is done in initialization
5006          * itself
5007          */
5008         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5009                 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5010                 pmcraid_init_cmdblk(cmdp, i);
5011                 cmdp->drv_inst = pinstance;
5012                 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5013         }
5014
5015         return 0;
5016 }
5017
5018 /**
5019  * pmcraid_reinit_buffers - resets various buffer pointers
5020  * @pinstance: pointer to adapter instance
5021  * Return value
5022  *      none
5023  */
5024 static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5025 {
5026         int i;
5027         int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5028
5029         for (i = 0; i < pinstance->num_hrrq; i++) {
5030                 memset(pinstance->hrrq_start[i], 0, buffer_size);
5031                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5032                 pinstance->hrrq_end[i] =
5033                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5034                 pinstance->host_toggle_bit[i] = 1;
5035         }
5036 }
5037
5038 /**
5039  * pmcraid_init_instance - initialize per instance data structure
5040  * @pdev: pointer to pci device structure
5041  * @host: pointer to Scsi_Host structure
5042  * @mapped_pci_addr: memory mapped IOA configuration registers
5043  *
5044  * Return Value
5045  *       0 on success, non-zero in case of any failure
5046  */
5047 static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
5048                                  void __iomem *mapped_pci_addr)
5049 {
5050         struct pmcraid_instance *pinstance =
5051                 (struct pmcraid_instance *)host->hostdata;
5052
5053         pinstance->host = host;
5054         pinstance->pdev = pdev;
5055
5056         /* Initialize register addresses */
5057         pinstance->mapped_dma_addr = mapped_pci_addr;
5058
5059         /* Initialize chip-specific details */
5060         {
5061                 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5062                 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5063
5064                 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5065
5066                 pint_regs->ioa_host_interrupt_reg =
5067                         mapped_pci_addr + chip_cfg->ioa_host_intr;
5068                 pint_regs->ioa_host_interrupt_clr_reg =
5069                         mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5070                 pint_regs->ioa_host_msix_interrupt_reg =
5071                         mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5072                 pint_regs->host_ioa_interrupt_reg =
5073                         mapped_pci_addr + chip_cfg->host_ioa_intr;
5074                 pint_regs->host_ioa_interrupt_clr_reg =
5075                         mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5076
5077                 /* Current version of firmware exposes interrupt mask set
5078                  * and mask clr registers through memory mapped bar0.
5079                  */
5080                 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5081                 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5082                 pint_regs->ioa_host_interrupt_mask_reg =
5083                         mapped_pci_addr + chip_cfg->ioa_host_mask;
5084                 pint_regs->ioa_host_interrupt_mask_clr_reg =
5085                         mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5086                 pint_regs->global_interrupt_mask_reg =
5087                         mapped_pci_addr + chip_cfg->global_intr_mask;
5088         };
5089
5090         pinstance->ioa_reset_attempts = 0;
5091         init_waitqueue_head(&pinstance->reset_wait_q);
5092
5093         atomic_set(&pinstance->outstanding_cmds, 0);
5094         atomic_set(&pinstance->last_message_id, 0);
5095         atomic_set(&pinstance->expose_resources, 0);
5096
5097         INIT_LIST_HEAD(&pinstance->free_res_q);
5098         INIT_LIST_HEAD(&pinstance->used_res_q);
5099         INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5100         INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5101
5102         spin_lock_init(&pinstance->free_pool_lock);
5103         spin_lock_init(&pinstance->pending_pool_lock);
5104         spin_lock_init(&pinstance->resource_lock);
5105         mutex_init(&pinstance->aen_queue_lock);
5106
5107         /* Work-queue (Shared) for deferred processing error handling */
5108         INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5109
5110         /* Initialize the default log_level */
5111         pinstance->current_log_level = pmcraid_log_level;
5112
5113         /* Setup variables required for reset engine */
5114         pinstance->ioa_state = IOA_STATE_UNKNOWN;
5115         pinstance->reset_cmd = NULL;
5116         return 0;
5117 }
5118
5119 /**
5120  * pmcraid_shutdown - shutdown adapter controller.
5121  * @pdev: pci device struct
5122  *
5123  * Issues an adapter shutdown to the card waits for its completion
5124  *
5125  * Return value
5126  *        none
5127  */
5128 static void pmcraid_shutdown(struct pci_dev *pdev)
5129 {
5130         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5131         pmcraid_reset_bringdown(pinstance);
5132 }
5133
5134
5135 /*
5136  * pmcraid_get_minor - returns unused minor number from minor number bitmap
5137  */
5138 static unsigned short pmcraid_get_minor(void)
5139 {
5140         int minor;
5141
5142         minor = find_first_zero_bit(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
5143         __set_bit(minor, pmcraid_minor);
5144         return minor;
5145 }
5146
5147 /*
5148  * pmcraid_release_minor - releases given minor back to minor number bitmap
5149  */
5150 static void pmcraid_release_minor(unsigned short minor)
5151 {
5152         __clear_bit(minor, pmcraid_minor);
5153 }
5154
5155 /**
5156  * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5157  *
5158  * @pinstance: pointer to adapter instance for which to register device
5159  *
5160  * Return value
5161  *      0 in case of success, otherwise non-zero
5162  */
5163 static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5164 {
5165         int minor;
5166         int error;
5167
5168         minor = pmcraid_get_minor();
5169         cdev_init(&pinstance->cdev, &pmcraid_fops);
5170         pinstance->cdev.owner = THIS_MODULE;
5171
5172         error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5173
5174         if (error)
5175                 pmcraid_release_minor(minor);
5176         else
5177                 device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5178                               NULL, "%s%u", PMCRAID_DEVFILE, minor);
5179         return error;
5180 }
5181
5182 /**
5183  * pmcraid_release_chrdev - unregisters per-adapter management interface
5184  *
5185  * @pinstance: pointer to adapter instance structure
5186  *
5187  * Return value
5188  *  none
5189  */
5190 static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5191 {
5192         pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5193         device_destroy(pmcraid_class,
5194                        MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5195         cdev_del(&pinstance->cdev);
5196 }
5197
5198 /**
5199  * pmcraid_remove - IOA hot plug remove entry point
5200  * @pdev: pci device struct
5201  *
5202  * Return value
5203  *        none
5204  */
5205 static void pmcraid_remove(struct pci_dev *pdev)
5206 {
5207         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5208
5209         /* remove the management interface (/dev file) for this device */
5210         pmcraid_release_chrdev(pinstance);
5211
5212         /* remove host template from scsi midlayer */
5213         scsi_remove_host(pinstance->host);
5214
5215         /* block requests from mid-layer */
5216         scsi_block_requests(pinstance->host);
5217
5218         /* initiate shutdown adapter */
5219         pmcraid_shutdown(pdev);
5220
5221         pmcraid_disable_interrupts(pinstance, ~0);
5222         flush_work(&pinstance->worker_q);
5223
5224         pmcraid_kill_tasklets(pinstance);
5225         pmcraid_unregister_interrupt_handler(pinstance);
5226         pmcraid_release_buffers(pinstance);
5227         iounmap(pinstance->mapped_dma_addr);
5228         pci_release_regions(pdev);
5229         scsi_host_put(pinstance->host);
5230         pci_disable_device(pdev);
5231
5232         return;
5233 }
5234
5235 /**
5236  * pmcraid_suspend - driver suspend entry point for power management
5237  * @dev:   Device structure
5238  *
5239  * Return Value - 0 always
5240  */
5241 static int __maybe_unused pmcraid_suspend(struct device *dev)
5242 {
5243         struct pci_dev *pdev = to_pci_dev(dev);
5244         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5245
5246         pmcraid_shutdown(pdev);
5247         pmcraid_disable_interrupts(pinstance, ~0);
5248         pmcraid_kill_tasklets(pinstance);
5249         pmcraid_unregister_interrupt_handler(pinstance);
5250
5251         return 0;
5252 }
5253
5254 /**
5255  * pmcraid_resume - driver resume entry point PCI power management
5256  * @dev: Device structure
5257  *
5258  * Return Value - 0 in case of success. Error code in case of any failure
5259  */
5260 static int __maybe_unused pmcraid_resume(struct device *dev)
5261 {
5262         struct pci_dev *pdev = to_pci_dev(dev);
5263         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5264         struct Scsi_Host *host = pinstance->host;
5265         int rc = 0;
5266
5267         if (sizeof(dma_addr_t) == 4 ||
5268             dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
5269                 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
5270
5271         if (rc == 0)
5272                 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
5273
5274         if (rc != 0) {
5275                 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5276                 goto disable_device;
5277         }
5278
5279         pmcraid_disable_interrupts(pinstance, ~0);
5280         atomic_set(&pinstance->outstanding_cmds, 0);
5281         rc = pmcraid_register_interrupt_handler(pinstance);
5282
5283         if (rc) {
5284                 dev_err(&pdev->dev,
5285                         "resume: couldn't register interrupt handlers\n");
5286                 rc = -ENODEV;
5287                 goto release_host;
5288         }
5289
5290         pmcraid_init_tasklets(pinstance);
5291         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5292
5293         /* Start with hard reset sequence which brings up IOA to operational
5294          * state as well as completes the reset sequence.
5295          */
5296         pinstance->ioa_hard_reset = 1;
5297
5298         /* Start IOA firmware initialization and bring card to Operational
5299          * state.
5300          */
5301         if (pmcraid_reset_bringup(pinstance)) {
5302                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5303                 rc = -ENODEV;
5304                 goto release_tasklets;
5305         }
5306
5307         return 0;
5308
5309 release_tasklets:
5310         pmcraid_disable_interrupts(pinstance, ~0);
5311         pmcraid_kill_tasklets(pinstance);
5312         pmcraid_unregister_interrupt_handler(pinstance);
5313
5314 release_host:
5315         scsi_host_put(host);
5316
5317 disable_device:
5318
5319         return rc;
5320 }
5321
5322 /**
5323  * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5324  *                              completion of the ioa reset
5325  * @cmd: pointer to reset command block
5326  */
5327 static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5328 {
5329         struct pmcraid_instance *pinstance = cmd->drv_inst;
5330         unsigned long flags;
5331
5332         spin_lock_irqsave(pinstance->host->host_lock, flags);
5333         pmcraid_ioa_reset(cmd);
5334         spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5335         scsi_unblock_requests(pinstance->host);
5336         schedule_work(&pinstance->worker_q);
5337 }
5338
5339 /**
5340  * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5341  *
5342  * @cmd: pointer to pmcraid_cmd structure
5343  *
5344  * Return Value
5345  *  0 for success or non-zero for failure cases
5346  */
5347 static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5348 {
5349         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5350         void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5351
5352         pmcraid_reinit_cmdblk(cmd);
5353
5354         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5355         ioarcb->request_type = REQ_TYPE_IOACMD;
5356         ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5357         ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5358
5359         /* If this was called as part of resource table reinitialization due to
5360          * lost CCN, it is enough to return the command block back to free pool
5361          * as part of set_supported_devs completion function.
5362          */
5363         if (cmd->drv_inst->reinit_cfg_table) {
5364                 cmd->drv_inst->reinit_cfg_table = 0;
5365                 cmd->release = 1;
5366                 cmd_done = pmcraid_reinit_cfgtable_done;
5367         }
5368
5369         /* we will be done with the reset sequence after set supported devices,
5370          * setup the done function to return the command block back to free
5371          * pool
5372          */
5373         pmcraid_send_cmd(cmd,
5374                          cmd_done,
5375                          PMCRAID_SET_SUP_DEV_TIMEOUT,
5376                          pmcraid_timeout_handler);
5377         return;
5378 }
5379
5380 /**
5381  * pmcraid_set_timestamp - set the timestamp to IOAFP
5382  *
5383  * @cmd: pointer to pmcraid_cmd structure
5384  *
5385  * Return Value
5386  *  0 for success or non-zero for failure cases
5387  */
5388 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5389 {
5390         struct pmcraid_instance *pinstance = cmd->drv_inst;
5391         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5392         __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5393         struct pmcraid_ioadl_desc *ioadl;
5394         u64 timestamp;
5395
5396         timestamp = ktime_get_real_seconds() * 1000;
5397
5398         pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5399         pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5400         pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5401         pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5402         pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5403         pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp)  >> 40);
5404
5405         pmcraid_reinit_cmdblk(cmd);
5406         ioarcb->request_type = REQ_TYPE_SCSI;
5407         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5408         ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5409         ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5410         memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5411
5412         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5413                                         offsetof(struct pmcraid_ioarcb,
5414                                                 add_data.u.ioadl[0]));
5415         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5416         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
5417
5418         ioarcb->request_flags0 |= NO_LINK_DESCS;
5419         ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5420         ioarcb->data_transfer_length =
5421                 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5422         ioadl = &(ioarcb->add_data.u.ioadl[0]);
5423         ioadl->flags = IOADL_FLAGS_LAST_DESC;
5424         ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5425         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5426
5427         if (!pinstance->timestamp_error) {
5428                 pinstance->timestamp_error = 0;
5429                 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5430                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5431         } else {
5432                 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5433                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5434                 return;
5435         }
5436 }
5437
5438
5439 /**
5440  * pmcraid_init_res_table - Initialize the resource table
5441  * @cmd:  pointer to pmcraid command struct
5442  *
5443  * This function looks through the existing resource table, comparing
5444  * it with the config table. This function will take care of old/new
5445  * devices and schedule adding/removing them from the mid-layer
5446  * as appropriate.
5447  *
5448  * Return value
5449  *       None
5450  */
5451 static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5452 {
5453         struct pmcraid_instance *pinstance = cmd->drv_inst;
5454         struct pmcraid_resource_entry *res, *temp;
5455         struct pmcraid_config_table_entry *cfgte;
5456         unsigned long lock_flags;
5457         int found, rc, i;
5458         u16 fw_version;
5459         LIST_HEAD(old_res);
5460
5461         if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5462                 pmcraid_err("IOA requires microcode download\n");
5463
5464         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5465
5466         /* resource list is protected by pinstance->resource_lock.
5467          * init_res_table can be called from probe (user-thread) or runtime
5468          * reset (timer/tasklet)
5469          */
5470         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5471
5472         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5473                 list_move_tail(&res->queue, &old_res);
5474
5475         for (i = 0; i < le16_to_cpu(pinstance->cfg_table->num_entries); i++) {
5476                 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5477                                                 PMCRAID_FW_VERSION_1)
5478                         cfgte = &pinstance->cfg_table->entries[i];
5479                 else
5480                         cfgte = (struct pmcraid_config_table_entry *)
5481                                         &pinstance->cfg_table->entries_ext[i];
5482
5483                 if (!pmcraid_expose_resource(fw_version, cfgte))
5484                         continue;
5485
5486                 found = 0;
5487
5488                 /* If this entry was already detected and initialized */
5489                 list_for_each_entry_safe(res, temp, &old_res, queue) {
5490
5491                         rc = memcmp(&res->cfg_entry.resource_address,
5492                                     &cfgte->resource_address,
5493                                     sizeof(cfgte->resource_address));
5494                         if (!rc) {
5495                                 list_move_tail(&res->queue,
5496                                                 &pinstance->used_res_q);
5497                                 found = 1;
5498                                 break;
5499                         }
5500                 }
5501
5502                 /* If this is new entry, initialize it and add it the queue */
5503                 if (!found) {
5504
5505                         if (list_empty(&pinstance->free_res_q)) {
5506                                 pmcraid_err("Too many devices attached\n");
5507                                 break;
5508                         }
5509
5510                         found = 1;
5511                         res = list_entry(pinstance->free_res_q.next,
5512                                          struct pmcraid_resource_entry, queue);
5513
5514                         res->scsi_dev = NULL;
5515                         res->change_detected = RES_CHANGE_ADD;
5516                         res->reset_progress = 0;
5517                         list_move_tail(&res->queue, &pinstance->used_res_q);
5518                 }
5519
5520                 /* copy new configuration table entry details into driver
5521                  * maintained resource entry
5522                  */
5523                 if (found) {
5524                         memcpy(&res->cfg_entry, cfgte,
5525                                         pinstance->config_table_entry_size);
5526                         pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5527                                  res->cfg_entry.resource_type,
5528                                  (fw_version <= PMCRAID_FW_VERSION_1 ?
5529                                         res->cfg_entry.unique_flags1 :
5530                                         le16_to_cpu(res->cfg_entry.array_id) & 0xFF),
5531                                  le32_to_cpu(res->cfg_entry.resource_address));
5532                 }
5533         }
5534
5535         /* Detect any deleted entries, mark them for deletion from mid-layer */
5536         list_for_each_entry_safe(res, temp, &old_res, queue) {
5537
5538                 if (res->scsi_dev) {
5539                         res->change_detected = RES_CHANGE_DEL;
5540                         res->cfg_entry.resource_handle =
5541                                 PMCRAID_INVALID_RES_HANDLE;
5542                         list_move_tail(&res->queue, &pinstance->used_res_q);
5543                 } else {
5544                         list_move_tail(&res->queue, &pinstance->free_res_q);
5545                 }
5546         }
5547
5548         /* release the resource list lock */
5549         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5550         pmcraid_set_timestamp(cmd);
5551 }
5552
5553 /**
5554  * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5555  * @cmd: pointer pmcraid_cmd struct
5556  *
5557  * This function sends a Query IOA Configuration command to the adapter to
5558  * retrieve the IOA configuration table.
5559  *
5560  * Return value:
5561  *      none
5562  */
5563 static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5564 {
5565         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5566         struct pmcraid_ioadl_desc *ioadl;
5567         struct pmcraid_instance *pinstance = cmd->drv_inst;
5568         __be32 cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5569
5570         if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5571                                         PMCRAID_FW_VERSION_1)
5572                 pinstance->config_table_entry_size =
5573                         sizeof(struct pmcraid_config_table_entry);
5574         else
5575                 pinstance->config_table_entry_size =
5576                         sizeof(struct pmcraid_config_table_entry_ext);
5577
5578         ioarcb->request_type = REQ_TYPE_IOACMD;
5579         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5580
5581         ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5582
5583         /* firmware requires 4-byte length field, specified in B.E format */
5584         memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5585
5586         /* Since entire config table can be described by single IOADL, it can
5587          * be part of IOARCB itself
5588          */
5589         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5590                                         offsetof(struct pmcraid_ioarcb,
5591                                                 add_data.u.ioadl[0]));
5592         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5593         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
5594
5595         ioarcb->request_flags0 |= NO_LINK_DESCS;
5596         ioarcb->data_transfer_length =
5597                 cpu_to_le32(sizeof(struct pmcraid_config_table));
5598
5599         ioadl = &(ioarcb->add_data.u.ioadl[0]);
5600         ioadl->flags = IOADL_FLAGS_LAST_DESC;
5601         ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5602         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5603
5604         pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5605                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5606 }
5607
5608
5609 /**
5610  * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5611  * @pdev: pointer to pci device structure
5612  * @dev_id: pointer to device ids structure
5613  *
5614  * Return Value
5615  *      returns 0 if the device is claimed and successfully configured.
5616  *      returns non-zero error code in case of any failure
5617  */
5618 static int pmcraid_probe(struct pci_dev *pdev,
5619                          const struct pci_device_id *dev_id)
5620 {
5621         struct pmcraid_instance *pinstance;
5622         struct Scsi_Host *host;
5623         void __iomem *mapped_pci_addr;
5624         int rc = PCIBIOS_SUCCESSFUL;
5625
5626         if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5627                 pmcraid_err
5628                         ("maximum number(%d) of supported adapters reached\n",
5629                          atomic_read(&pmcraid_adapter_count));
5630                 return -ENOMEM;
5631         }
5632
5633         atomic_inc(&pmcraid_adapter_count);
5634         rc = pci_enable_device(pdev);
5635
5636         if (rc) {
5637                 dev_err(&pdev->dev, "Cannot enable adapter\n");
5638                 atomic_dec(&pmcraid_adapter_count);
5639                 return rc;
5640         }
5641
5642         dev_info(&pdev->dev,
5643                 "Found new IOA(%x:%x), Total IOA count: %d\n",
5644                  pdev->vendor, pdev->device,
5645                  atomic_read(&pmcraid_adapter_count));
5646
5647         rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5648
5649         if (rc < 0) {
5650                 dev_err(&pdev->dev,
5651                         "Couldn't register memory range of registers\n");
5652                 goto out_disable_device;
5653         }
5654
5655         mapped_pci_addr = pci_iomap(pdev, 0, 0);
5656
5657         if (!mapped_pci_addr) {
5658                 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5659                 rc = -ENOMEM;
5660                 goto out_release_regions;
5661         }
5662
5663         pci_set_master(pdev);
5664
5665         /* Firmware requires the system bus address of IOARCB to be within
5666          * 32-bit addressable range though it has 64-bit IOARRIN register.
5667          * However, firmware supports 64-bit streaming DMA buffers, whereas
5668          * coherent buffers are to be 32-bit. Since dma_alloc_coherent always
5669          * returns memory within 4GB (if not, change this logic), coherent
5670          * buffers are within firmware acceptable address ranges.
5671          */
5672         if (sizeof(dma_addr_t) == 4 ||
5673             dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
5674                 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
5675
5676         /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5677          * bit mask for dma_alloc_coherent to return addresses within 4GB
5678          */
5679         if (rc == 0)
5680                 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
5681
5682         if (rc != 0) {
5683                 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5684                 goto cleanup_nomem;
5685         }
5686
5687         host = scsi_host_alloc(&pmcraid_host_template,
5688                                 sizeof(struct pmcraid_instance));
5689
5690         if (!host) {
5691                 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5692                 rc = -ENOMEM;
5693                 goto cleanup_nomem;
5694         }
5695
5696         host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5697         host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5698         host->unique_id = host->host_no;
5699         host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5700         host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5701
5702         /* zero out entire instance structure */
5703         pinstance = (struct pmcraid_instance *)host->hostdata;
5704         memset(pinstance, 0, sizeof(*pinstance));
5705
5706         pinstance->chip_cfg =
5707                 (struct pmcraid_chip_details *)(dev_id->driver_data);
5708
5709         rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5710
5711         if (rc < 0) {
5712                 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5713                 goto out_scsi_host_put;
5714         }
5715
5716         pci_set_drvdata(pdev, pinstance);
5717
5718         /* Save PCI config-space for use following the reset */
5719         rc = pci_save_state(pinstance->pdev);
5720
5721         if (rc != 0) {
5722                 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5723                 goto out_scsi_host_put;
5724         }
5725
5726         pmcraid_disable_interrupts(pinstance, ~0);
5727
5728         rc = pmcraid_register_interrupt_handler(pinstance);
5729
5730         if (rc) {
5731                 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
5732                 goto out_scsi_host_put;
5733         }
5734
5735         pmcraid_init_tasklets(pinstance);
5736
5737         /* allocate verious buffers used by LLD.*/
5738         rc = pmcraid_init_buffers(pinstance);
5739
5740         if (rc) {
5741                 pmcraid_err("couldn't allocate memory blocks\n");
5742                 goto out_unregister_isr;
5743         }
5744
5745         /* check the reset type required */
5746         pmcraid_reset_type(pinstance);
5747
5748         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5749
5750         /* Start IOA firmware initialization and bring card to Operational
5751          * state.
5752          */
5753         pmcraid_info("starting IOA initialization sequence\n");
5754         if (pmcraid_reset_bringup(pinstance)) {
5755                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5756                 rc = 1;
5757                 goto out_release_bufs;
5758         }
5759
5760         /* Add adapter instance into mid-layer list */
5761         rc = scsi_add_host(pinstance->host, &pdev->dev);
5762         if (rc != 0) {
5763                 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
5764                 goto out_release_bufs;
5765         }
5766
5767         scsi_scan_host(pinstance->host);
5768
5769         rc = pmcraid_setup_chrdev(pinstance);
5770
5771         if (rc != 0) {
5772                 pmcraid_err("couldn't create mgmt interface, error: %x\n",
5773                              rc);
5774                 goto out_remove_host;
5775         }
5776
5777         /* Schedule worker thread to handle CCN and take care of adding and
5778          * removing devices to OS
5779          */
5780         atomic_set(&pinstance->expose_resources, 1);
5781         schedule_work(&pinstance->worker_q);
5782         return rc;
5783
5784 out_remove_host:
5785         scsi_remove_host(host);
5786
5787 out_release_bufs:
5788         pmcraid_release_buffers(pinstance);
5789
5790 out_unregister_isr:
5791         pmcraid_kill_tasklets(pinstance);
5792         pmcraid_unregister_interrupt_handler(pinstance);
5793
5794 out_scsi_host_put:
5795         scsi_host_put(host);
5796
5797 cleanup_nomem:
5798         iounmap(mapped_pci_addr);
5799
5800 out_release_regions:
5801         pci_release_regions(pdev);
5802
5803 out_disable_device:
5804         atomic_dec(&pmcraid_adapter_count);
5805         pci_disable_device(pdev);
5806         return -ENODEV;
5807 }
5808
5809 static SIMPLE_DEV_PM_OPS(pmcraid_pm_ops, pmcraid_suspend, pmcraid_resume);
5810
5811 /*
5812  * PCI driver structure of pmcraid driver
5813  */
5814 static struct pci_driver pmcraid_driver = {
5815         .name = PMCRAID_DRIVER_NAME,
5816         .id_table = pmcraid_pci_table,
5817         .probe = pmcraid_probe,
5818         .remove = pmcraid_remove,
5819         .driver.pm = &pmcraid_pm_ops,
5820         .shutdown = pmcraid_shutdown
5821 };
5822
5823 /**
5824  * pmcraid_init - module load entry point
5825  */
5826 static int __init pmcraid_init(void)
5827 {
5828         dev_t dev;
5829         int error;
5830
5831         pmcraid_info("%s Device Driver version: %s\n",
5832                          PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
5833
5834         error = alloc_chrdev_region(&dev, 0,
5835                                     PMCRAID_MAX_ADAPTERS,
5836                                     PMCRAID_DEVFILE);
5837
5838         if (error) {
5839                 pmcraid_err("failed to get a major number for adapters\n");
5840                 goto out_init;
5841         }
5842
5843         pmcraid_major = MAJOR(dev);
5844         pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
5845
5846         if (IS_ERR(pmcraid_class)) {
5847                 error = PTR_ERR(pmcraid_class);
5848                 pmcraid_err("failed to register with sysfs, error = %x\n",
5849                             error);
5850                 goto out_unreg_chrdev;
5851         }
5852
5853         error = pmcraid_netlink_init();
5854
5855         if (error) {
5856                 class_destroy(pmcraid_class);
5857                 goto out_unreg_chrdev;
5858         }
5859
5860         error = pci_register_driver(&pmcraid_driver);
5861
5862         if (error == 0)
5863                 goto out_init;
5864
5865         pmcraid_err("failed to register pmcraid driver, error = %x\n",
5866                      error);
5867         class_destroy(pmcraid_class);
5868         pmcraid_netlink_release();
5869
5870 out_unreg_chrdev:
5871         unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
5872
5873 out_init:
5874         return error;
5875 }
5876
5877 /**
5878  * pmcraid_exit - module unload entry point
5879  */
5880 static void __exit pmcraid_exit(void)
5881 {
5882         pmcraid_netlink_release();
5883         unregister_chrdev_region(MKDEV(pmcraid_major, 0),
5884                                  PMCRAID_MAX_ADAPTERS);
5885         pci_unregister_driver(&pmcraid_driver);
5886         class_destroy(pmcraid_class);
5887 }
5888
5889 module_init(pmcraid_init);
5890 module_exit(pmcraid_exit);