Merge tag '5.17-rc-ksmbd-server-fixes' of git://git.samba.org/ksmbd
[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_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_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_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, GFP_KERNEL | __GFP_ZERO,
3225                         &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  *
3306  * This function queues a request generated by the mid-layer. Midlayer calls
3307  * this routine within host->lock. Some of the functions called by queuecommand
3308  * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3309  *
3310  * Return value:
3311  *        0 on success
3312  *        SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3313  *        SCSI_MLQUEUE_HOST_BUSY if host is busy
3314  */
3315 static int pmcraid_queuecommand_lck(struct scsi_cmnd *scsi_cmd)
3316 {
3317         struct pmcraid_instance *pinstance;
3318         struct pmcraid_resource_entry *res;
3319         struct pmcraid_ioarcb *ioarcb;
3320         struct pmcraid_cmd *cmd;
3321         u32 fw_version;
3322         int rc = 0;
3323
3324         pinstance =
3325                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3326         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3327         res = scsi_cmd->device->hostdata;
3328         scsi_cmd->result = (DID_OK << 16);
3329
3330         /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3331          * the command
3332          */
3333         if (pinstance->ioa_state == IOA_STATE_DEAD) {
3334                 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3335                 scsi_cmd->result = (DID_NO_CONNECT << 16);
3336                 scsi_done(scsi_cmd);
3337                 return 0;
3338         }
3339
3340         /* If IOA reset is in progress, can't queue the commands */
3341         if (pinstance->ioa_reset_in_progress)
3342                 return SCSI_MLQUEUE_HOST_BUSY;
3343
3344         /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3345          * the command here itself with success return
3346          */
3347         if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3348                 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3349                 scsi_done(scsi_cmd);
3350                 return 0;
3351         }
3352
3353         /* initialize the command and IOARCB to be sent to IOA */
3354         cmd = pmcraid_get_free_cmd(pinstance);
3355
3356         if (cmd == NULL) {
3357                 pmcraid_err("free command block is not available\n");
3358                 return SCSI_MLQUEUE_HOST_BUSY;
3359         }
3360
3361         cmd->scsi_cmd = scsi_cmd;
3362         ioarcb = &(cmd->ioa_cb->ioarcb);
3363         memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3364         ioarcb->resource_handle = res->cfg_entry.resource_handle;
3365         ioarcb->request_type = REQ_TYPE_SCSI;
3366
3367         /* set hrrq number where the IOA should respond to. Note that all cmds
3368          * generated internally uses hrrq_id 0, exception to this is the cmd
3369          * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3370          * hrrq_id assigned here in queuecommand
3371          */
3372         ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3373                           pinstance->num_hrrq;
3374         cmd->cmd_done = pmcraid_io_done;
3375
3376         if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3377                 if (scsi_cmd->underflow == 0)
3378                         ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3379
3380                 if (res->sync_reqd) {
3381                         ioarcb->request_flags0 |= SYNC_COMPLETE;
3382                         res->sync_reqd = 0;
3383                 }
3384
3385                 ioarcb->request_flags0 |= NO_LINK_DESCS;
3386
3387                 if (scsi_cmd->flags & SCMD_TAGGED)
3388                         ioarcb->request_flags1 |= TASK_TAG_SIMPLE;
3389
3390                 if (RES_IS_GSCSI(res->cfg_entry))
3391                         ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3392         }
3393
3394         rc = pmcraid_build_ioadl(pinstance, cmd);
3395
3396         pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3397                      le32_to_cpu(ioarcb->response_handle) >> 2,
3398                      scsi_cmd->cmnd[0], pinstance->host->unique_id,
3399                      RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3400                         PMCRAID_PHYS_BUS_ID,
3401                      RES_IS_VSET(res->cfg_entry) ?
3402                         (fw_version <= PMCRAID_FW_VERSION_1 ?
3403                                 res->cfg_entry.unique_flags1 :
3404                                 le16_to_cpu(res->cfg_entry.array_id) & 0xFF) :
3405                         RES_TARGET(res->cfg_entry.resource_address),
3406                      RES_LUN(res->cfg_entry.resource_address));
3407
3408         if (likely(rc == 0)) {
3409                 _pmcraid_fire_command(cmd);
3410         } else {
3411                 pmcraid_err("queuecommand could not build ioadl\n");
3412                 pmcraid_return_cmd(cmd);
3413                 rc = SCSI_MLQUEUE_HOST_BUSY;
3414         }
3415
3416         return rc;
3417 }
3418
3419 static DEF_SCSI_QCMD(pmcraid_queuecommand)
3420
3421 /*
3422  * pmcraid_open -char node "open" entry, allowed only users with admin access
3423  */
3424 static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3425 {
3426         struct pmcraid_instance *pinstance;
3427
3428         if (!capable(CAP_SYS_ADMIN))
3429                 return -EACCES;
3430
3431         /* Populate adapter instance * pointer for use by ioctl */
3432         pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3433         filep->private_data = pinstance;
3434
3435         return 0;
3436 }
3437
3438 /*
3439  * pmcraid_fasync - Async notifier registration from applications
3440  *
3441  * This function adds the calling process to a driver global queue. When an
3442  * event occurs, SIGIO will be sent to all processes in this queue.
3443  */
3444 static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3445 {
3446         struct pmcraid_instance *pinstance;
3447         int rc;
3448
3449         pinstance = filep->private_data;
3450         mutex_lock(&pinstance->aen_queue_lock);
3451         rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3452         mutex_unlock(&pinstance->aen_queue_lock);
3453
3454         return rc;
3455 }
3456
3457
3458 /**
3459  * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3460  * commands sent over IOCTL interface
3461  *
3462  * @cmd       : pointer to struct pmcraid_cmd
3463  * @buflen    : length of the request buffer
3464  * @direction : data transfer direction
3465  *
3466  * Return value
3467  *  0 on success, non-zero error code on failure
3468  */
3469 static int pmcraid_build_passthrough_ioadls(
3470         struct pmcraid_cmd *cmd,
3471         int buflen,
3472         int direction
3473 )
3474 {
3475         struct pmcraid_sglist *sglist = NULL;
3476         struct scatterlist *sg = NULL;
3477         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3478         struct pmcraid_ioadl_desc *ioadl;
3479         int i;
3480
3481         sglist = pmcraid_alloc_sglist(buflen);
3482
3483         if (!sglist) {
3484                 pmcraid_err("can't allocate memory for passthrough SGls\n");
3485                 return -ENOMEM;
3486         }
3487
3488         sglist->num_dma_sg = dma_map_sg(&cmd->drv_inst->pdev->dev,
3489                                         sglist->scatterlist,
3490                                         sglist->num_sg, direction);
3491
3492         if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3493                 dev_err(&cmd->drv_inst->pdev->dev,
3494                         "Failed to map passthrough buffer!\n");
3495                 pmcraid_free_sglist(sglist);
3496                 return -EIO;
3497         }
3498
3499         cmd->sglist = sglist;
3500         ioarcb->request_flags0 |= NO_LINK_DESCS;
3501
3502         ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3503
3504         /* Initialize IOADL descriptor addresses */
3505         for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3506                 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3507                 ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3508                 ioadl[i].flags = 0;
3509         }
3510
3511         /* setup the last descriptor */
3512         ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3513
3514         return 0;
3515 }
3516
3517
3518 /**
3519  * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3520  *
3521  * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3522  * @buflen: size of the request buffer
3523  * @direction: data transfer direction
3524  *
3525  * Return value
3526  *  0 on success, non-zero error code on failure
3527  */
3528 static void pmcraid_release_passthrough_ioadls(
3529         struct pmcraid_cmd *cmd,
3530         int buflen,
3531         int direction
3532 )
3533 {
3534         struct pmcraid_sglist *sglist = cmd->sglist;
3535
3536         if (buflen > 0) {
3537                 dma_unmap_sg(&cmd->drv_inst->pdev->dev,
3538                              sglist->scatterlist,
3539                              sglist->num_sg,
3540                              direction);
3541                 pmcraid_free_sglist(sglist);
3542                 cmd->sglist = NULL;
3543         }
3544 }
3545
3546 /**
3547  * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3548  *
3549  * @pinstance: pointer to adapter instance structure
3550  * @ioctl_cmd: ioctl code
3551  * @buflen: unused
3552  * @arg: pointer to pmcraid_passthrough_buffer user buffer
3553  *
3554  * Return value
3555  *  0 on success, non-zero error code on failure
3556  */
3557 static long pmcraid_ioctl_passthrough(
3558         struct pmcraid_instance *pinstance,
3559         unsigned int ioctl_cmd,
3560         unsigned int buflen,
3561         void __user *arg
3562 )
3563 {
3564         struct pmcraid_passthrough_ioctl_buffer *buffer;
3565         struct pmcraid_ioarcb *ioarcb;
3566         struct pmcraid_cmd *cmd;
3567         struct pmcraid_cmd *cancel_cmd;
3568         void __user *request_buffer;
3569         unsigned long request_offset;
3570         unsigned long lock_flags;
3571         void __user *ioasa;
3572         u32 ioasc;
3573         int request_size;
3574         int buffer_size;
3575         u8 direction;
3576         int rc = 0;
3577
3578         /* If IOA reset is in progress, wait 10 secs for reset to complete */
3579         if (pinstance->ioa_reset_in_progress) {
3580                 rc = wait_event_interruptible_timeout(
3581                                 pinstance->reset_wait_q,
3582                                 !pinstance->ioa_reset_in_progress,
3583                                 msecs_to_jiffies(10000));
3584
3585                 if (!rc)
3586                         return -ETIMEDOUT;
3587                 else if (rc < 0)
3588                         return -ERESTARTSYS;
3589         }
3590
3591         /* If adapter is not in operational state, return error */
3592         if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3593                 pmcraid_err("IOA is not operational\n");
3594                 return -ENOTTY;
3595         }
3596
3597         buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3598         buffer = kmalloc(buffer_size, GFP_KERNEL);
3599
3600         if (!buffer) {
3601                 pmcraid_err("no memory for passthrough buffer\n");
3602                 return -ENOMEM;
3603         }
3604
3605         request_offset =
3606             offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3607
3608         request_buffer = arg + request_offset;
3609
3610         rc = copy_from_user(buffer, arg,
3611                              sizeof(struct pmcraid_passthrough_ioctl_buffer));
3612
3613         ioasa = arg + offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa);
3614
3615         if (rc) {
3616                 pmcraid_err("ioctl: can't copy passthrough buffer\n");
3617                 rc = -EFAULT;
3618                 goto out_free_buffer;
3619         }
3620
3621         request_size = le32_to_cpu(buffer->ioarcb.data_transfer_length);
3622
3623         if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3624                 direction = DMA_TO_DEVICE;
3625         } else {
3626                 direction = DMA_FROM_DEVICE;
3627         }
3628
3629         if (request_size < 0) {
3630                 rc = -EINVAL;
3631                 goto out_free_buffer;
3632         }
3633
3634         /* check if we have any additional command parameters */
3635         if (le16_to_cpu(buffer->ioarcb.add_cmd_param_length)
3636              > PMCRAID_ADD_CMD_PARAM_LEN) {
3637                 rc = -EINVAL;
3638                 goto out_free_buffer;
3639         }
3640
3641         cmd = pmcraid_get_free_cmd(pinstance);
3642
3643         if (!cmd) {
3644                 pmcraid_err("free command block is not available\n");
3645                 rc = -ENOMEM;
3646                 goto out_free_buffer;
3647         }
3648
3649         cmd->scsi_cmd = NULL;
3650         ioarcb = &(cmd->ioa_cb->ioarcb);
3651
3652         /* Copy the user-provided IOARCB stuff field by field */
3653         ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3654         ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3655         ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3656         ioarcb->request_type = buffer->ioarcb.request_type;
3657         ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3658         ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3659         memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3660
3661         if (buffer->ioarcb.add_cmd_param_length) {
3662                 ioarcb->add_cmd_param_length =
3663                         buffer->ioarcb.add_cmd_param_length;
3664                 ioarcb->add_cmd_param_offset =
3665                         buffer->ioarcb.add_cmd_param_offset;
3666                 memcpy(ioarcb->add_data.u.add_cmd_params,
3667                         buffer->ioarcb.add_data.u.add_cmd_params,
3668                         le16_to_cpu(buffer->ioarcb.add_cmd_param_length));
3669         }
3670
3671         /* set hrrq number where the IOA should respond to. Note that all cmds
3672          * generated internally uses hrrq_id 0, exception to this is the cmd
3673          * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3674          * hrrq_id assigned here in queuecommand
3675          */
3676         ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3677                           pinstance->num_hrrq;
3678
3679         if (request_size) {
3680                 rc = pmcraid_build_passthrough_ioadls(cmd,
3681                                                       request_size,
3682                                                       direction);
3683                 if (rc) {
3684                         pmcraid_err("couldn't build passthrough ioadls\n");
3685                         goto out_free_cmd;
3686                 }
3687         }
3688
3689         /* If data is being written into the device, copy the data from user
3690          * buffers
3691          */
3692         if (direction == DMA_TO_DEVICE && request_size > 0) {
3693                 rc = pmcraid_copy_sglist(cmd->sglist,
3694                                          request_buffer,
3695                                          request_size,
3696                                          direction);
3697                 if (rc) {
3698                         pmcraid_err("failed to copy user buffer\n");
3699                         goto out_free_sglist;
3700                 }
3701         }
3702
3703         /* passthrough ioctl is a blocking command so, put the user to sleep
3704          * until timeout. Note that a timeout value of 0 means, do timeout.
3705          */
3706         cmd->cmd_done = pmcraid_internal_done;
3707         init_completion(&cmd->wait_for_completion);
3708         cmd->completion_req = 1;
3709
3710         pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3711                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3712                      cmd->ioa_cb->ioarcb.cdb[0],
3713                      le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3714
3715         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3716         _pmcraid_fire_command(cmd);
3717         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3718
3719         /* NOTE ! Remove the below line once abort_task is implemented
3720          * in firmware. This line disables ioctl command timeout handling logic
3721          * similar to IO command timeout handling, making ioctl commands to wait
3722          * until the command completion regardless of timeout value specified in
3723          * ioarcb
3724          */
3725         buffer->ioarcb.cmd_timeout = 0;
3726
3727         /* If command timeout is specified put caller to wait till that time,
3728          * otherwise it would be blocking wait. If command gets timed out, it
3729          * will be aborted.
3730          */
3731         if (buffer->ioarcb.cmd_timeout == 0) {
3732                 wait_for_completion(&cmd->wait_for_completion);
3733         } else if (!wait_for_completion_timeout(
3734                         &cmd->wait_for_completion,
3735                         msecs_to_jiffies(le16_to_cpu(buffer->ioarcb.cmd_timeout) * 1000))) {
3736
3737                 pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3738                         le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3739                         cmd->ioa_cb->ioarcb.cdb[0]);
3740
3741                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3742                 cancel_cmd = pmcraid_abort_cmd(cmd);
3743                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3744
3745                 if (cancel_cmd) {
3746                         wait_for_completion(&cancel_cmd->wait_for_completion);
3747                         ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
3748                         pmcraid_return_cmd(cancel_cmd);
3749
3750                         /* if abort task couldn't find the command i.e it got
3751                          * completed prior to aborting, return good completion.
3752                          * if command got aborted successfully or there was IOA
3753                          * reset due to abort task itself getting timedout then
3754                          * return -ETIMEDOUT
3755                          */
3756                         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3757                             PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3758                                 if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3759                                         rc = -ETIMEDOUT;
3760                                 goto out_handle_response;
3761                         }
3762                 }
3763
3764                 /* no command block for abort task or abort task failed to abort
3765                  * the IOARCB, then wait for 150 more seconds and initiate reset
3766                  * sequence after timeout
3767                  */
3768                 if (!wait_for_completion_timeout(
3769                         &cmd->wait_for_completion,
3770                         msecs_to_jiffies(150 * 1000))) {
3771                         pmcraid_reset_bringup(cmd->drv_inst);
3772                         rc = -ETIMEDOUT;
3773                 }
3774         }
3775
3776 out_handle_response:
3777         /* copy entire IOASA buffer and return IOCTL success.
3778          * If copying IOASA to user-buffer fails, return
3779          * EFAULT
3780          */
3781         if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3782                 sizeof(struct pmcraid_ioasa))) {
3783                 pmcraid_err("failed to copy ioasa buffer to user\n");
3784                 rc = -EFAULT;
3785         }
3786
3787         /* If the data transfer was from device, copy the data onto user
3788          * buffers
3789          */
3790         else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3791                 rc = pmcraid_copy_sglist(cmd->sglist,
3792                                          request_buffer,
3793                                          request_size,
3794                                          direction);
3795                 if (rc) {
3796                         pmcraid_err("failed to copy user buffer\n");
3797                         rc = -EFAULT;
3798                 }
3799         }
3800
3801 out_free_sglist:
3802         pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3803
3804 out_free_cmd:
3805         pmcraid_return_cmd(cmd);
3806
3807 out_free_buffer:
3808         kfree(buffer);
3809
3810         return rc;
3811 }
3812
3813
3814
3815
3816 /**
3817  * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
3818  *
3819  * @pinstance: pointer to adapter instance structure
3820  * @cmd: ioctl command passed in
3821  * @buflen: length of user_buffer
3822  * @user_buffer: user buffer pointer
3823  *
3824  * Return Value
3825  *   0 in case of success, otherwise appropriate error code
3826  */
3827 static long pmcraid_ioctl_driver(
3828         struct pmcraid_instance *pinstance,
3829         unsigned int cmd,
3830         unsigned int buflen,
3831         void __user *user_buffer
3832 )
3833 {
3834         int rc = -ENOSYS;
3835
3836         switch (cmd) {
3837         case PMCRAID_IOCTL_RESET_ADAPTER:
3838                 pmcraid_reset_bringup(pinstance);
3839                 rc = 0;
3840                 break;
3841
3842         default:
3843                 break;
3844         }
3845
3846         return rc;
3847 }
3848
3849 /**
3850  * pmcraid_check_ioctl_buffer - check for proper access to user buffer
3851  *
3852  * @cmd: ioctl command
3853  * @arg: user buffer
3854  * @hdr: pointer to kernel memory for pmcraid_ioctl_header
3855  *
3856  * Return Value
3857  *      negetive error code if there are access issues, otherwise zero.
3858  *      Upon success, returns ioctl header copied out of user buffer.
3859  */
3860
3861 static int pmcraid_check_ioctl_buffer(
3862         int cmd,
3863         void __user *arg,
3864         struct pmcraid_ioctl_header *hdr
3865 )
3866 {
3867         int rc;
3868
3869         if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
3870                 pmcraid_err("couldn't copy ioctl header from user buffer\n");
3871                 return -EFAULT;
3872         }
3873
3874         /* check for valid driver signature */
3875         rc = memcmp(hdr->signature,
3876                     PMCRAID_IOCTL_SIGNATURE,
3877                     sizeof(hdr->signature));
3878         if (rc) {
3879                 pmcraid_err("signature verification failed\n");
3880                 return -EINVAL;
3881         }
3882
3883         return 0;
3884 }
3885
3886 /*
3887  *  pmcraid_ioctl - char node ioctl entry point
3888  */
3889 static long pmcraid_chr_ioctl(
3890         struct file *filep,
3891         unsigned int cmd,
3892         unsigned long arg
3893 )
3894 {
3895         struct pmcraid_instance *pinstance = NULL;
3896         struct pmcraid_ioctl_header *hdr = NULL;
3897         void __user *argp = (void __user *)arg;
3898         int retval = -ENOTTY;
3899
3900         hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
3901
3902         if (!hdr) {
3903                 pmcraid_err("failed to allocate memory for ioctl header\n");
3904                 return -ENOMEM;
3905         }
3906
3907         retval = pmcraid_check_ioctl_buffer(cmd, argp, hdr);
3908
3909         if (retval) {
3910                 pmcraid_info("chr_ioctl: header check failed\n");
3911                 kfree(hdr);
3912                 return retval;
3913         }
3914
3915         pinstance = filep->private_data;
3916
3917         if (!pinstance) {
3918                 pmcraid_info("adapter instance is not found\n");
3919                 kfree(hdr);
3920                 return -ENOTTY;
3921         }
3922
3923         switch (_IOC_TYPE(cmd)) {
3924
3925         case PMCRAID_PASSTHROUGH_IOCTL:
3926                 /* If ioctl code is to download microcode, we need to block
3927                  * mid-layer requests.
3928                  */
3929                 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
3930                         scsi_block_requests(pinstance->host);
3931
3932                 retval = pmcraid_ioctl_passthrough(pinstance, cmd,
3933                                                    hdr->buffer_length, argp);
3934
3935                 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
3936                         scsi_unblock_requests(pinstance->host);
3937                 break;
3938
3939         case PMCRAID_DRIVER_IOCTL:
3940                 arg += sizeof(struct pmcraid_ioctl_header);
3941                 retval = pmcraid_ioctl_driver(pinstance, cmd,
3942                                               hdr->buffer_length, argp);
3943                 break;
3944
3945         default:
3946                 retval = -ENOTTY;
3947                 break;
3948         }
3949
3950         kfree(hdr);
3951
3952         return retval;
3953 }
3954
3955 /*
3956  * File operations structure for management interface
3957  */
3958 static const struct file_operations pmcraid_fops = {
3959         .owner = THIS_MODULE,
3960         .open = pmcraid_chr_open,
3961         .fasync = pmcraid_chr_fasync,
3962         .unlocked_ioctl = pmcraid_chr_ioctl,
3963         .compat_ioctl = compat_ptr_ioctl,
3964         .llseek = noop_llseek,
3965 };
3966
3967
3968
3969
3970 /**
3971  * pmcraid_show_log_level - Display adapter's error logging level
3972  * @dev: class device struct
3973  * @attr: unused
3974  * @buf: buffer
3975  *
3976  * Return value:
3977  *  number of bytes printed to buffer
3978  */
3979 static ssize_t pmcraid_show_log_level(
3980         struct device *dev,
3981         struct device_attribute *attr,
3982         char *buf)
3983 {
3984         struct Scsi_Host *shost = class_to_shost(dev);
3985         struct pmcraid_instance *pinstance =
3986                 (struct pmcraid_instance *)shost->hostdata;
3987         return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
3988 }
3989
3990 /**
3991  * pmcraid_store_log_level - Change the adapter's error logging level
3992  * @dev: class device struct
3993  * @attr: unused
3994  * @buf: buffer
3995  * @count: not used
3996  *
3997  * Return value:
3998  *  number of bytes printed to buffer
3999  */
4000 static ssize_t pmcraid_store_log_level(
4001         struct device *dev,
4002         struct device_attribute *attr,
4003         const char *buf,
4004         size_t count
4005 )
4006 {
4007         struct Scsi_Host *shost;
4008         struct pmcraid_instance *pinstance;
4009         u8 val;
4010
4011         if (kstrtou8(buf, 10, &val))
4012                 return -EINVAL;
4013         /* log-level should be from 0 to 2 */
4014         if (val > 2)
4015                 return -EINVAL;
4016
4017         shost = class_to_shost(dev);
4018         pinstance = (struct pmcraid_instance *)shost->hostdata;
4019         pinstance->current_log_level = val;
4020
4021         return strlen(buf);
4022 }
4023
4024 static struct device_attribute pmcraid_log_level_attr = {
4025         .attr = {
4026                  .name = "log_level",
4027                  .mode = S_IRUGO | S_IWUSR,
4028                  },
4029         .show = pmcraid_show_log_level,
4030         .store = pmcraid_store_log_level,
4031 };
4032
4033 /**
4034  * pmcraid_show_drv_version - Display driver version
4035  * @dev: class device struct
4036  * @attr: unused
4037  * @buf: buffer
4038  *
4039  * Return value:
4040  *  number of bytes printed to buffer
4041  */
4042 static ssize_t pmcraid_show_drv_version(
4043         struct device *dev,
4044         struct device_attribute *attr,
4045         char *buf
4046 )
4047 {
4048         return snprintf(buf, PAGE_SIZE, "version: %s\n",
4049                         PMCRAID_DRIVER_VERSION);
4050 }
4051
4052 static struct device_attribute pmcraid_driver_version_attr = {
4053         .attr = {
4054                  .name = "drv_version",
4055                  .mode = S_IRUGO,
4056                  },
4057         .show = pmcraid_show_drv_version,
4058 };
4059
4060 /**
4061  * pmcraid_show_adapter_id - Display driver assigned adapter id
4062  * @dev: class device struct
4063  * @attr: unused
4064  * @buf: buffer
4065  *
4066  * Return value:
4067  *  number of bytes printed to buffer
4068  */
4069 static ssize_t pmcraid_show_adapter_id(
4070         struct device *dev,
4071         struct device_attribute *attr,
4072         char *buf
4073 )
4074 {
4075         struct Scsi_Host *shost = class_to_shost(dev);
4076         struct pmcraid_instance *pinstance =
4077                 (struct pmcraid_instance *)shost->hostdata;
4078         u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4079                 pinstance->pdev->devfn;
4080         u32 aen_group = pmcraid_event_family.id;
4081
4082         return snprintf(buf, PAGE_SIZE,
4083                         "adapter id: %d\nminor: %d\naen group: %d\n",
4084                         adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4085 }
4086
4087 static struct device_attribute pmcraid_adapter_id_attr = {
4088         .attr = {
4089                  .name = "adapter_id",
4090                  .mode = S_IRUGO,
4091                  },
4092         .show = pmcraid_show_adapter_id,
4093 };
4094
4095 static struct attribute *pmcraid_host_attrs[] = {
4096         &pmcraid_log_level_attr.attr,
4097         &pmcraid_driver_version_attr.attr,
4098         &pmcraid_adapter_id_attr.attr,
4099         NULL,
4100 };
4101
4102 ATTRIBUTE_GROUPS(pmcraid_host);
4103
4104 /* host template structure for pmcraid driver */
4105 static struct scsi_host_template pmcraid_host_template = {
4106         .module = THIS_MODULE,
4107         .name = PMCRAID_DRIVER_NAME,
4108         .queuecommand = pmcraid_queuecommand,
4109         .eh_abort_handler = pmcraid_eh_abort_handler,
4110         .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4111         .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4112         .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4113         .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4114
4115         .slave_alloc = pmcraid_slave_alloc,
4116         .slave_configure = pmcraid_slave_configure,
4117         .slave_destroy = pmcraid_slave_destroy,
4118         .change_queue_depth = pmcraid_change_queue_depth,
4119         .can_queue = PMCRAID_MAX_IO_CMD,
4120         .this_id = -1,
4121         .sg_tablesize = PMCRAID_MAX_IOADLS,
4122         .max_sectors = PMCRAID_IOA_MAX_SECTORS,
4123         .no_write_same = 1,
4124         .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4125         .shost_groups = pmcraid_host_groups,
4126         .proc_name = PMCRAID_DRIVER_NAME,
4127 };
4128
4129 /*
4130  * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4131  * @irq: interrupt vector number
4132  * @dev_id: pointer hrrq_vector
4133  *
4134  * Return Value
4135  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4136  */
4137
4138 static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4139 {
4140         struct pmcraid_isr_param *hrrq_vector;
4141         struct pmcraid_instance *pinstance;
4142         unsigned long lock_flags;
4143         u32 intrs_val;
4144         int hrrq_id;
4145
4146         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4147         hrrq_id = hrrq_vector->hrrq_id;
4148         pinstance = hrrq_vector->drv_inst;
4149
4150         if (!hrrq_id) {
4151                 /* Read the interrupt */
4152                 intrs_val = pmcraid_read_interrupts(pinstance);
4153                 if (intrs_val &&
4154                         ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4155                         & DOORBELL_INTR_MSIX_CLR) == 0)) {
4156                         /* Any error interrupts including unit_check,
4157                          * initiate IOA reset.In case of unit check indicate
4158                          * to reset_sequence that IOA unit checked and prepare
4159                          * for a dump during reset sequence
4160                          */
4161                         if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4162                                 if (intrs_val & INTRS_IOA_UNIT_CHECK)
4163                                         pinstance->ioa_unit_check = 1;
4164
4165                                 pmcraid_err("ISR: error interrupts: %x \
4166                                         initiating reset\n", intrs_val);
4167                                 spin_lock_irqsave(pinstance->host->host_lock,
4168                                         lock_flags);
4169                                 pmcraid_initiate_reset(pinstance);
4170                                 spin_unlock_irqrestore(
4171                                         pinstance->host->host_lock,
4172                                         lock_flags);
4173                         }
4174                         /* If interrupt was as part of the ioa initialization,
4175                          * clear it. Delete the timer and wakeup the
4176                          * reset engine to proceed with reset sequence
4177                          */
4178                         if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4179                                 pmcraid_clr_trans_op(pinstance);
4180
4181                         /* Clear the interrupt register by writing
4182                          * to host to ioa doorbell. Once done
4183                          * FW will clear the interrupt.
4184                          */
4185                         iowrite32(DOORBELL_INTR_MSIX_CLR,
4186                                 pinstance->int_regs.host_ioa_interrupt_reg);
4187                         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4188
4189
4190                 }
4191         }
4192
4193         tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4194
4195         return IRQ_HANDLED;
4196 }
4197
4198 /**
4199  * pmcraid_isr  - implements legacy interrupt handling routine
4200  *
4201  * @irq: interrupt vector number
4202  * @dev_id: pointer hrrq_vector
4203  *
4204  * Return Value
4205  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4206  */
4207 static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4208 {
4209         struct pmcraid_isr_param *hrrq_vector;
4210         struct pmcraid_instance *pinstance;
4211         u32 intrs;
4212         unsigned long lock_flags;
4213         int hrrq_id = 0;
4214
4215         /* In case of legacy interrupt mode where interrupts are shared across
4216          * isrs, it may be possible that the current interrupt is not from IOA
4217          */
4218         if (!dev_id) {
4219                 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4220                 return IRQ_NONE;
4221         }
4222         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4223         pinstance = hrrq_vector->drv_inst;
4224
4225         intrs = pmcraid_read_interrupts(pinstance);
4226
4227         if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4228                 return IRQ_NONE;
4229
4230         /* Any error interrupts including unit_check, initiate IOA reset.
4231          * In case of unit check indicate to reset_sequence that IOA unit
4232          * checked and prepare for a dump during reset sequence
4233          */
4234         if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4235
4236                 if (intrs & INTRS_IOA_UNIT_CHECK)
4237                         pinstance->ioa_unit_check = 1;
4238
4239                 iowrite32(intrs,
4240                           pinstance->int_regs.ioa_host_interrupt_clr_reg);
4241                 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4242                             intrs);
4243                 intrs = ioread32(
4244                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4245                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4246                 pmcraid_initiate_reset(pinstance);
4247                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4248         } else {
4249                 /* If interrupt was as part of the ioa initialization,
4250                  * clear. Delete the timer and wakeup the
4251                  * reset engine to proceed with reset sequence
4252                  */
4253                 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4254                         pmcraid_clr_trans_op(pinstance);
4255                 } else {
4256                         iowrite32(intrs,
4257                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4258                         ioread32(
4259                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4260
4261                         tasklet_schedule(
4262                                         &(pinstance->isr_tasklet[hrrq_id]));
4263                 }
4264         }
4265
4266         return IRQ_HANDLED;
4267 }
4268
4269
4270 /**
4271  * pmcraid_worker_function -  worker thread function
4272  *
4273  * @workp: pointer to struct work queue
4274  *
4275  * Return Value
4276  *       None
4277  */
4278
4279 static void pmcraid_worker_function(struct work_struct *workp)
4280 {
4281         struct pmcraid_instance *pinstance;
4282         struct pmcraid_resource_entry *res;
4283         struct pmcraid_resource_entry *temp;
4284         struct scsi_device *sdev;
4285         unsigned long lock_flags;
4286         unsigned long host_lock_flags;
4287         u16 fw_version;
4288         u8 bus, target, lun;
4289
4290         pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4291         /* add resources only after host is added into system */
4292         if (!atomic_read(&pinstance->expose_resources))
4293                 return;
4294
4295         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4296
4297         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4298         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4299
4300                 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4301                         sdev = res->scsi_dev;
4302
4303                         /* host_lock must be held before calling
4304                          * scsi_device_get
4305                          */
4306                         spin_lock_irqsave(pinstance->host->host_lock,
4307                                           host_lock_flags);
4308                         if (!scsi_device_get(sdev)) {
4309                                 spin_unlock_irqrestore(
4310                                                 pinstance->host->host_lock,
4311                                                 host_lock_flags);
4312                                 pmcraid_info("deleting %x from midlayer\n",
4313                                              res->cfg_entry.resource_address);
4314                                 list_move_tail(&res->queue,
4315                                                 &pinstance->free_res_q);
4316                                 spin_unlock_irqrestore(
4317                                         &pinstance->resource_lock,
4318                                         lock_flags);
4319                                 scsi_remove_device(sdev);
4320                                 scsi_device_put(sdev);
4321                                 spin_lock_irqsave(&pinstance->resource_lock,
4322                                                    lock_flags);
4323                                 res->change_detected = 0;
4324                         } else {
4325                                 spin_unlock_irqrestore(
4326                                                 pinstance->host->host_lock,
4327                                                 host_lock_flags);
4328                         }
4329                 }
4330         }
4331
4332         list_for_each_entry(res, &pinstance->used_res_q, queue) {
4333
4334                 if (res->change_detected == RES_CHANGE_ADD) {
4335
4336                         if (!pmcraid_expose_resource(fw_version,
4337                                                      &res->cfg_entry))
4338                                 continue;
4339
4340                         if (RES_IS_VSET(res->cfg_entry)) {
4341                                 bus = PMCRAID_VSET_BUS_ID;
4342                                 if (fw_version <= PMCRAID_FW_VERSION_1)
4343                                         target = res->cfg_entry.unique_flags1;
4344                                 else
4345                                         target = le16_to_cpu(res->cfg_entry.array_id) & 0xFF;
4346                                 lun = PMCRAID_VSET_LUN_ID;
4347                         } else {
4348                                 bus = PMCRAID_PHYS_BUS_ID;
4349                                 target =
4350                                      RES_TARGET(
4351                                         res->cfg_entry.resource_address);
4352                                 lun = RES_LUN(res->cfg_entry.resource_address);
4353                         }
4354
4355                         res->change_detected = 0;
4356                         spin_unlock_irqrestore(&pinstance->resource_lock,
4357                                                 lock_flags);
4358                         scsi_add_device(pinstance->host, bus, target, lun);
4359                         spin_lock_irqsave(&pinstance->resource_lock,
4360                                            lock_flags);
4361                 }
4362         }
4363
4364         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4365 }
4366
4367 /**
4368  * pmcraid_tasklet_function - Tasklet function
4369  *
4370  * @instance: pointer to msix param structure
4371  *
4372  * Return Value
4373  *      None
4374  */
4375 static void pmcraid_tasklet_function(unsigned long instance)
4376 {
4377         struct pmcraid_isr_param *hrrq_vector;
4378         struct pmcraid_instance *pinstance;
4379         unsigned long hrrq_lock_flags;
4380         unsigned long pending_lock_flags;
4381         unsigned long host_lock_flags;
4382         spinlock_t *lockp; /* hrrq buffer lock */
4383         int id;
4384         u32 resp;
4385
4386         hrrq_vector = (struct pmcraid_isr_param *)instance;
4387         pinstance = hrrq_vector->drv_inst;
4388         id = hrrq_vector->hrrq_id;
4389         lockp = &(pinstance->hrrq_lock[id]);
4390
4391         /* loop through each of the commands responded by IOA. Each HRRQ buf is
4392          * protected by its own lock. Traversals must be done within this lock
4393          * as there may be multiple tasklets running on multiple CPUs. Note
4394          * that the lock is held just for picking up the response handle and
4395          * manipulating hrrq_curr/toggle_bit values.
4396          */
4397         spin_lock_irqsave(lockp, hrrq_lock_flags);
4398
4399         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4400
4401         while ((resp & HRRQ_TOGGLE_BIT) ==
4402                 pinstance->host_toggle_bit[id]) {
4403
4404                 int cmd_index = resp >> 2;
4405                 struct pmcraid_cmd *cmd = NULL;
4406
4407                 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4408                         pinstance->hrrq_curr[id]++;
4409                 } else {
4410                         pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4411                         pinstance->host_toggle_bit[id] ^= 1u;
4412                 }
4413
4414                 if (cmd_index >= PMCRAID_MAX_CMD) {
4415                         /* In case of invalid response handle, log message */
4416                         pmcraid_err("Invalid response handle %d\n", cmd_index);
4417                         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4418                         continue;
4419                 }
4420
4421                 cmd = pinstance->cmd_list[cmd_index];
4422                 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4423
4424                 spin_lock_irqsave(&pinstance->pending_pool_lock,
4425                                    pending_lock_flags);
4426                 list_del(&cmd->free_list);
4427                 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4428                                         pending_lock_flags);
4429                 del_timer(&cmd->timer);
4430                 atomic_dec(&pinstance->outstanding_cmds);
4431
4432                 if (cmd->cmd_done == pmcraid_ioa_reset) {
4433                         spin_lock_irqsave(pinstance->host->host_lock,
4434                                           host_lock_flags);
4435                         cmd->cmd_done(cmd);
4436                         spin_unlock_irqrestore(pinstance->host->host_lock,
4437                                                host_lock_flags);
4438                 } else if (cmd->cmd_done != NULL) {
4439                         cmd->cmd_done(cmd);
4440                 }
4441                 /* loop over until we are done with all responses */
4442                 spin_lock_irqsave(lockp, hrrq_lock_flags);
4443                 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4444         }
4445
4446         spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4447 }
4448
4449 /**
4450  * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4451  * @pinstance: pointer to adapter instance structure
4452  *
4453  * This routine un-registers registered interrupt handler and
4454  * also frees irqs/vectors.
4455  *
4456  * Retun Value
4457  *      None
4458  */
4459 static
4460 void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4461 {
4462         struct pci_dev *pdev = pinstance->pdev;
4463         int i;
4464
4465         for (i = 0; i < pinstance->num_hrrq; i++)
4466                 free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
4467
4468         pinstance->interrupt_mode = 0;
4469         pci_free_irq_vectors(pdev);
4470 }
4471
4472 /**
4473  * pmcraid_register_interrupt_handler - registers interrupt handler
4474  * @pinstance: pointer to per-adapter instance structure
4475  *
4476  * Return Value
4477  *      0 on success, non-zero error code otherwise.
4478  */
4479 static int
4480 pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4481 {
4482         struct pci_dev *pdev = pinstance->pdev;
4483         unsigned int irq_flag = PCI_IRQ_LEGACY, flag;
4484         int num_hrrq, rc, i;
4485         irq_handler_t isr;
4486
4487         if (pmcraid_enable_msix)
4488                 irq_flag |= PCI_IRQ_MSIX;
4489
4490         num_hrrq = pci_alloc_irq_vectors(pdev, 1, PMCRAID_NUM_MSIX_VECTORS,
4491                         irq_flag);
4492         if (num_hrrq < 0)
4493                 return num_hrrq;
4494
4495         if (pdev->msix_enabled) {
4496                 flag = 0;
4497                 isr = pmcraid_isr_msix;
4498         } else {
4499                 flag = IRQF_SHARED;
4500                 isr = pmcraid_isr;
4501         }
4502
4503         for (i = 0; i < num_hrrq; i++) {
4504                 struct pmcraid_isr_param *vec = &pinstance->hrrq_vector[i];
4505
4506                 vec->hrrq_id = i;
4507                 vec->drv_inst = pinstance;
4508                 rc = request_irq(pci_irq_vector(pdev, i), isr, flag,
4509                                 PMCRAID_DRIVER_NAME, vec);
4510                 if (rc)
4511                         goto out_unwind;
4512         }
4513
4514         pinstance->num_hrrq = num_hrrq;
4515         if (pdev->msix_enabled) {
4516                 pinstance->interrupt_mode = 1;
4517                 iowrite32(DOORBELL_INTR_MODE_MSIX,
4518                           pinstance->int_regs.host_ioa_interrupt_reg);
4519                 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4520         }
4521
4522         return 0;
4523
4524 out_unwind:
4525         while (--i > 0)
4526                 free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
4527         pci_free_irq_vectors(pdev);
4528         return rc;
4529 }
4530
4531 /**
4532  * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4533  * @pinstance: per adapter instance structure pointer
4534  * @max_index: number of buffer blocks to release
4535  *
4536  * Return Value
4537  *  None
4538  */
4539 static void
4540 pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4541 {
4542         int i;
4543         for (i = 0; i < max_index; i++) {
4544                 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4545                 pinstance->cmd_list[i] = NULL;
4546         }
4547         kmem_cache_destroy(pinstance->cmd_cachep);
4548         pinstance->cmd_cachep = NULL;
4549 }
4550
4551 /**
4552  * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4553  * @pinstance: pointer to per adapter instance structure
4554  * @max_index: number of buffers (from 0 onwards) to release
4555  *
4556  * This function assumes that the command blocks for which control blocks are
4557  * linked are not released.
4558  *
4559  * Return Value
4560  *       None
4561  */
4562 static void
4563 pmcraid_release_control_blocks(
4564         struct pmcraid_instance *pinstance,
4565         int max_index
4566 )
4567 {
4568         int i;
4569
4570         if (pinstance->control_pool == NULL)
4571                 return;
4572
4573         for (i = 0; i < max_index; i++) {
4574                 dma_pool_free(pinstance->control_pool,
4575                               pinstance->cmd_list[i]->ioa_cb,
4576                               pinstance->cmd_list[i]->ioa_cb_bus_addr);
4577                 pinstance->cmd_list[i]->ioa_cb = NULL;
4578                 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4579         }
4580         dma_pool_destroy(pinstance->control_pool);
4581         pinstance->control_pool = NULL;
4582 }
4583
4584 /**
4585  * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4586  * @pinstance: pointer to per adapter instance structure
4587  *
4588  * Allocates memory for command blocks using kernel slab allocator.
4589  *
4590  * Return Value
4591  *      0 in case of success; -ENOMEM in case of failure
4592  */
4593 static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4594 {
4595         int i;
4596
4597         sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4598                 pinstance->host->unique_id);
4599
4600
4601         pinstance->cmd_cachep = kmem_cache_create(
4602                                         pinstance->cmd_pool_name,
4603                                         sizeof(struct pmcraid_cmd), 0,
4604                                         SLAB_HWCACHE_ALIGN, NULL);
4605         if (!pinstance->cmd_cachep)
4606                 return -ENOMEM;
4607
4608         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4609                 pinstance->cmd_list[i] =
4610                         kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4611                 if (!pinstance->cmd_list[i]) {
4612                         pmcraid_release_cmd_blocks(pinstance, i);
4613                         return -ENOMEM;
4614                 }
4615         }
4616         return 0;
4617 }
4618
4619 /**
4620  * pmcraid_allocate_control_blocks - allocates memory control blocks
4621  * @pinstance : pointer to per adapter instance structure
4622  *
4623  * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4624  * and IOASAs. This is called after command blocks are already allocated.
4625  *
4626  * Return Value
4627  *  0 in case it can allocate all control blocks, otherwise -ENOMEM
4628  */
4629 static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4630 {
4631         int i;
4632
4633         sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4634                 pinstance->host->unique_id);
4635
4636         pinstance->control_pool =
4637                 dma_pool_create(pinstance->ctl_pool_name,
4638                                 &pinstance->pdev->dev,
4639                                 sizeof(struct pmcraid_control_block),
4640                                 PMCRAID_IOARCB_ALIGNMENT, 0);
4641
4642         if (!pinstance->control_pool)
4643                 return -ENOMEM;
4644
4645         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4646                 pinstance->cmd_list[i]->ioa_cb =
4647                         dma_pool_zalloc(
4648                                 pinstance->control_pool,
4649                                 GFP_KERNEL,
4650                                 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4651
4652                 if (!pinstance->cmd_list[i]->ioa_cb) {
4653                         pmcraid_release_control_blocks(pinstance, i);
4654                         return -ENOMEM;
4655                 }
4656         }
4657         return 0;
4658 }
4659
4660 /**
4661  * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4662  * @pinstance: pointer to per adapter instance structure
4663  * @maxindex: size of hrrq buffer pointer array
4664  *
4665  * Return Value
4666  *      None
4667  */
4668 static void
4669 pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4670 {
4671         int i;
4672
4673         for (i = 0; i < maxindex; i++) {
4674                 dma_free_coherent(&pinstance->pdev->dev,
4675                                     HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4676                                     pinstance->hrrq_start[i],
4677                                     pinstance->hrrq_start_bus_addr[i]);
4678
4679                 /* reset pointers and toggle bit to zeros */
4680                 pinstance->hrrq_start[i] = NULL;
4681                 pinstance->hrrq_start_bus_addr[i] = 0;
4682                 pinstance->host_toggle_bit[i] = 0;
4683         }
4684 }
4685
4686 /**
4687  * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4688  * @pinstance: pointer to per adapter instance structure
4689  *
4690  * Return value
4691  *      0 hrrq buffers are allocated, -ENOMEM otherwise.
4692  */
4693 static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4694 {
4695         int i, buffer_size;
4696
4697         buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4698
4699         for (i = 0; i < pinstance->num_hrrq; i++) {
4700                 pinstance->hrrq_start[i] =
4701                         dma_alloc_coherent(&pinstance->pdev->dev, buffer_size,
4702                                            &pinstance->hrrq_start_bus_addr[i],
4703                                            GFP_KERNEL);
4704                 if (!pinstance->hrrq_start[i]) {
4705                         pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4706                                     i);
4707                         pmcraid_release_host_rrqs(pinstance, i);
4708                         return -ENOMEM;
4709                 }
4710
4711                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4712                 pinstance->hrrq_end[i] =
4713                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4714                 pinstance->host_toggle_bit[i] = 1;
4715                 spin_lock_init(&pinstance->hrrq_lock[i]);
4716         }
4717         return 0;
4718 }
4719
4720 /**
4721  * pmcraid_release_hcams - release HCAM buffers
4722  *
4723  * @pinstance: pointer to per adapter instance structure
4724  *
4725  * Return value
4726  *  none
4727  */
4728 static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4729 {
4730         if (pinstance->ccn.msg != NULL) {
4731                 dma_free_coherent(&pinstance->pdev->dev,
4732                                     PMCRAID_AEN_HDR_SIZE +
4733                                     sizeof(struct pmcraid_hcam_ccn_ext),
4734                                     pinstance->ccn.msg,
4735                                     pinstance->ccn.baddr);
4736
4737                 pinstance->ccn.msg = NULL;
4738                 pinstance->ccn.hcam = NULL;
4739                 pinstance->ccn.baddr = 0;
4740         }
4741
4742         if (pinstance->ldn.msg != NULL) {
4743                 dma_free_coherent(&pinstance->pdev->dev,
4744                                     PMCRAID_AEN_HDR_SIZE +
4745                                     sizeof(struct pmcraid_hcam_ldn),
4746                                     pinstance->ldn.msg,
4747                                     pinstance->ldn.baddr);
4748
4749                 pinstance->ldn.msg = NULL;
4750                 pinstance->ldn.hcam = NULL;
4751                 pinstance->ldn.baddr = 0;
4752         }
4753 }
4754
4755 /**
4756  * pmcraid_allocate_hcams - allocates HCAM buffers
4757  * @pinstance : pointer to per adapter instance structure
4758  *
4759  * Return Value:
4760  *   0 in case of successful allocation, non-zero otherwise
4761  */
4762 static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4763 {
4764         pinstance->ccn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
4765                                         PMCRAID_AEN_HDR_SIZE +
4766                                         sizeof(struct pmcraid_hcam_ccn_ext),
4767                                         &pinstance->ccn.baddr, GFP_KERNEL);
4768
4769         pinstance->ldn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
4770                                         PMCRAID_AEN_HDR_SIZE +
4771                                         sizeof(struct pmcraid_hcam_ldn),
4772                                         &pinstance->ldn.baddr, GFP_KERNEL);
4773
4774         if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
4775                 pmcraid_release_hcams(pinstance);
4776         } else {
4777                 pinstance->ccn.hcam =
4778                         (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
4779                 pinstance->ldn.hcam =
4780                         (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
4781
4782                 atomic_set(&pinstance->ccn.ignore, 0);
4783                 atomic_set(&pinstance->ldn.ignore, 0);
4784         }
4785
4786         return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
4787 }
4788
4789 /**
4790  * pmcraid_release_config_buffers - release config.table buffers
4791  * @pinstance: pointer to per adapter instance structure
4792  *
4793  * Return Value
4794  *       none
4795  */
4796 static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
4797 {
4798         if (pinstance->cfg_table != NULL &&
4799             pinstance->cfg_table_bus_addr != 0) {
4800                 dma_free_coherent(&pinstance->pdev->dev,
4801                                     sizeof(struct pmcraid_config_table),
4802                                     pinstance->cfg_table,
4803                                     pinstance->cfg_table_bus_addr);
4804                 pinstance->cfg_table = NULL;
4805                 pinstance->cfg_table_bus_addr = 0;
4806         }
4807
4808         if (pinstance->res_entries != NULL) {
4809                 int i;
4810
4811                 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4812                         list_del(&pinstance->res_entries[i].queue);
4813                 kfree(pinstance->res_entries);
4814                 pinstance->res_entries = NULL;
4815         }
4816
4817         pmcraid_release_hcams(pinstance);
4818 }
4819
4820 /**
4821  * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
4822  * @pinstance : pointer to per adapter instance structure
4823  *
4824  * Return Value
4825  *      0 for successful allocation, -ENOMEM for any failure
4826  */
4827 static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
4828 {
4829         int i;
4830
4831         pinstance->res_entries =
4832                         kcalloc(PMCRAID_MAX_RESOURCES,
4833                                 sizeof(struct pmcraid_resource_entry),
4834                                 GFP_KERNEL);
4835
4836         if (NULL == pinstance->res_entries) {
4837                 pmcraid_err("failed to allocate memory for resource table\n");
4838                 return -ENOMEM;
4839         }
4840
4841         for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4842                 list_add_tail(&pinstance->res_entries[i].queue,
4843                               &pinstance->free_res_q);
4844
4845         pinstance->cfg_table = dma_alloc_coherent(&pinstance->pdev->dev,
4846                                      sizeof(struct pmcraid_config_table),
4847                                      &pinstance->cfg_table_bus_addr,
4848                                      GFP_KERNEL);
4849
4850         if (NULL == pinstance->cfg_table) {
4851                 pmcraid_err("couldn't alloc DMA memory for config table\n");
4852                 pmcraid_release_config_buffers(pinstance);
4853                 return -ENOMEM;
4854         }
4855
4856         if (pmcraid_allocate_hcams(pinstance)) {
4857                 pmcraid_err("could not alloc DMA memory for HCAMS\n");
4858                 pmcraid_release_config_buffers(pinstance);
4859                 return -ENOMEM;
4860         }
4861
4862         return 0;
4863 }
4864
4865 /**
4866  * pmcraid_init_tasklets - registers tasklets for response handling
4867  *
4868  * @pinstance: pointer adapter instance structure
4869  *
4870  * Return value
4871  *      none
4872  */
4873 static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
4874 {
4875         int i;
4876         for (i = 0; i < pinstance->num_hrrq; i++)
4877                 tasklet_init(&pinstance->isr_tasklet[i],
4878                              pmcraid_tasklet_function,
4879                              (unsigned long)&pinstance->hrrq_vector[i]);
4880 }
4881
4882 /**
4883  * pmcraid_kill_tasklets - destroys tasklets registered for response handling
4884  *
4885  * @pinstance: pointer to adapter instance structure
4886  *
4887  * Return value
4888  *      none
4889  */
4890 static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
4891 {
4892         int i;
4893         for (i = 0; i < pinstance->num_hrrq; i++)
4894                 tasklet_kill(&pinstance->isr_tasklet[i]);
4895 }
4896
4897 /**
4898  * pmcraid_release_buffers - release per-adapter buffers allocated
4899  *
4900  * @pinstance: pointer to adapter soft state
4901  *
4902  * Return Value
4903  *      none
4904  */
4905 static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
4906 {
4907         pmcraid_release_config_buffers(pinstance);
4908         pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
4909         pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
4910         pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4911
4912         if (pinstance->inq_data != NULL) {
4913                 dma_free_coherent(&pinstance->pdev->dev,
4914                                     sizeof(struct pmcraid_inquiry_data),
4915                                     pinstance->inq_data,
4916                                     pinstance->inq_data_baddr);
4917
4918                 pinstance->inq_data = NULL;
4919                 pinstance->inq_data_baddr = 0;
4920         }
4921
4922         if (pinstance->timestamp_data != NULL) {
4923                 dma_free_coherent(&pinstance->pdev->dev,
4924                                     sizeof(struct pmcraid_timestamp_data),
4925                                     pinstance->timestamp_data,
4926                                     pinstance->timestamp_data_baddr);
4927
4928                 pinstance->timestamp_data = NULL;
4929                 pinstance->timestamp_data_baddr = 0;
4930         }
4931 }
4932
4933 /**
4934  * pmcraid_init_buffers - allocates memory and initializes various structures
4935  * @pinstance: pointer to per adapter instance structure
4936  *
4937  * This routine pre-allocates memory based on the type of block as below:
4938  * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
4939  * IOARCBs(PMCRAID_MAX_CMD)  : DMAable memory, using pci pool allocator
4940  * config-table entries      : DMAable memory using dma_alloc_coherent
4941  * HostRRQs                  : DMAable memory, using dma_alloc_coherent
4942  *
4943  * Return Value
4944  *       0 in case all of the blocks are allocated, -ENOMEM otherwise.
4945  */
4946 static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
4947 {
4948         int i;
4949
4950         if (pmcraid_allocate_host_rrqs(pinstance)) {
4951                 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
4952                              pinstance->num_hrrq);
4953                 return -ENOMEM;
4954         }
4955
4956         if (pmcraid_allocate_config_buffers(pinstance)) {
4957                 pmcraid_err("couldn't allocate memory for config buffers\n");
4958                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4959                 return -ENOMEM;
4960         }
4961
4962         if (pmcraid_allocate_cmd_blocks(pinstance)) {
4963                 pmcraid_err("couldn't allocate memory for cmd blocks\n");
4964                 pmcraid_release_config_buffers(pinstance);
4965                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4966                 return -ENOMEM;
4967         }
4968
4969         if (pmcraid_allocate_control_blocks(pinstance)) {
4970                 pmcraid_err("couldn't allocate memory control blocks\n");
4971                 pmcraid_release_config_buffers(pinstance);
4972                 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
4973                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4974                 return -ENOMEM;
4975         }
4976
4977         /* allocate DMAable memory for page D0 INQUIRY buffer */
4978         pinstance->inq_data = dma_alloc_coherent(&pinstance->pdev->dev,
4979                                         sizeof(struct pmcraid_inquiry_data),
4980                                         &pinstance->inq_data_baddr, GFP_KERNEL);
4981         if (pinstance->inq_data == NULL) {
4982                 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
4983                 pmcraid_release_buffers(pinstance);
4984                 return -ENOMEM;
4985         }
4986
4987         /* allocate DMAable memory for set timestamp data buffer */
4988         pinstance->timestamp_data = dma_alloc_coherent(&pinstance->pdev->dev,
4989                                         sizeof(struct pmcraid_timestamp_data),
4990                                         &pinstance->timestamp_data_baddr,
4991                                         GFP_KERNEL);
4992         if (pinstance->timestamp_data == NULL) {
4993                 pmcraid_err("couldn't allocate DMA memory for \
4994                                 set time_stamp \n");
4995                 pmcraid_release_buffers(pinstance);
4996                 return -ENOMEM;
4997         }
4998
4999
5000         /* Initialize all the command blocks and add them to free pool. No
5001          * need to lock (free_pool_lock) as this is done in initialization
5002          * itself
5003          */
5004         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5005                 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5006                 pmcraid_init_cmdblk(cmdp, i);
5007                 cmdp->drv_inst = pinstance;
5008                 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5009         }
5010
5011         return 0;
5012 }
5013
5014 /**
5015  * pmcraid_reinit_buffers - resets various buffer pointers
5016  * @pinstance: pointer to adapter instance
5017  * Return value
5018  *      none
5019  */
5020 static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5021 {
5022         int i;
5023         int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5024
5025         for (i = 0; i < pinstance->num_hrrq; i++) {
5026                 memset(pinstance->hrrq_start[i], 0, buffer_size);
5027                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5028                 pinstance->hrrq_end[i] =
5029                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5030                 pinstance->host_toggle_bit[i] = 1;
5031         }
5032 }
5033
5034 /**
5035  * pmcraid_init_instance - initialize per instance data structure
5036  * @pdev: pointer to pci device structure
5037  * @host: pointer to Scsi_Host structure
5038  * @mapped_pci_addr: memory mapped IOA configuration registers
5039  *
5040  * Return Value
5041  *       0 on success, non-zero in case of any failure
5042  */
5043 static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
5044                                  void __iomem *mapped_pci_addr)
5045 {
5046         struct pmcraid_instance *pinstance =
5047                 (struct pmcraid_instance *)host->hostdata;
5048
5049         pinstance->host = host;
5050         pinstance->pdev = pdev;
5051
5052         /* Initialize register addresses */
5053         pinstance->mapped_dma_addr = mapped_pci_addr;
5054
5055         /* Initialize chip-specific details */
5056         {
5057                 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5058                 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5059
5060                 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5061
5062                 pint_regs->ioa_host_interrupt_reg =
5063                         mapped_pci_addr + chip_cfg->ioa_host_intr;
5064                 pint_regs->ioa_host_interrupt_clr_reg =
5065                         mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5066                 pint_regs->ioa_host_msix_interrupt_reg =
5067                         mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5068                 pint_regs->host_ioa_interrupt_reg =
5069                         mapped_pci_addr + chip_cfg->host_ioa_intr;
5070                 pint_regs->host_ioa_interrupt_clr_reg =
5071                         mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5072
5073                 /* Current version of firmware exposes interrupt mask set
5074                  * and mask clr registers through memory mapped bar0.
5075                  */
5076                 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5077                 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5078                 pint_regs->ioa_host_interrupt_mask_reg =
5079                         mapped_pci_addr + chip_cfg->ioa_host_mask;
5080                 pint_regs->ioa_host_interrupt_mask_clr_reg =
5081                         mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5082                 pint_regs->global_interrupt_mask_reg =
5083                         mapped_pci_addr + chip_cfg->global_intr_mask;
5084         };
5085
5086         pinstance->ioa_reset_attempts = 0;
5087         init_waitqueue_head(&pinstance->reset_wait_q);
5088
5089         atomic_set(&pinstance->outstanding_cmds, 0);
5090         atomic_set(&pinstance->last_message_id, 0);
5091         atomic_set(&pinstance->expose_resources, 0);
5092
5093         INIT_LIST_HEAD(&pinstance->free_res_q);
5094         INIT_LIST_HEAD(&pinstance->used_res_q);
5095         INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5096         INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5097
5098         spin_lock_init(&pinstance->free_pool_lock);
5099         spin_lock_init(&pinstance->pending_pool_lock);
5100         spin_lock_init(&pinstance->resource_lock);
5101         mutex_init(&pinstance->aen_queue_lock);
5102
5103         /* Work-queue (Shared) for deferred processing error handling */
5104         INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5105
5106         /* Initialize the default log_level */
5107         pinstance->current_log_level = pmcraid_log_level;
5108
5109         /* Setup variables required for reset engine */
5110         pinstance->ioa_state = IOA_STATE_UNKNOWN;
5111         pinstance->reset_cmd = NULL;
5112         return 0;
5113 }
5114
5115 /**
5116  * pmcraid_shutdown - shutdown adapter controller.
5117  * @pdev: pci device struct
5118  *
5119  * Issues an adapter shutdown to the card waits for its completion
5120  *
5121  * Return value
5122  *        none
5123  */
5124 static void pmcraid_shutdown(struct pci_dev *pdev)
5125 {
5126         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5127         pmcraid_reset_bringdown(pinstance);
5128 }
5129
5130
5131 /*
5132  * pmcraid_get_minor - returns unused minor number from minor number bitmap
5133  */
5134 static unsigned short pmcraid_get_minor(void)
5135 {
5136         int minor;
5137
5138         minor = find_first_zero_bit(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
5139         __set_bit(minor, pmcraid_minor);
5140         return minor;
5141 }
5142
5143 /*
5144  * pmcraid_release_minor - releases given minor back to minor number bitmap
5145  */
5146 static void pmcraid_release_minor(unsigned short minor)
5147 {
5148         __clear_bit(minor, pmcraid_minor);
5149 }
5150
5151 /**
5152  * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5153  *
5154  * @pinstance: pointer to adapter instance for which to register device
5155  *
5156  * Return value
5157  *      0 in case of success, otherwise non-zero
5158  */
5159 static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5160 {
5161         int minor;
5162         int error;
5163
5164         minor = pmcraid_get_minor();
5165         cdev_init(&pinstance->cdev, &pmcraid_fops);
5166         pinstance->cdev.owner = THIS_MODULE;
5167
5168         error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5169
5170         if (error)
5171                 pmcraid_release_minor(minor);
5172         else
5173                 device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5174                               NULL, "%s%u", PMCRAID_DEVFILE, minor);
5175         return error;
5176 }
5177
5178 /**
5179  * pmcraid_release_chrdev - unregisters per-adapter management interface
5180  *
5181  * @pinstance: pointer to adapter instance structure
5182  *
5183  * Return value
5184  *  none
5185  */
5186 static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5187 {
5188         pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5189         device_destroy(pmcraid_class,
5190                        MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5191         cdev_del(&pinstance->cdev);
5192 }
5193
5194 /**
5195  * pmcraid_remove - IOA hot plug remove entry point
5196  * @pdev: pci device struct
5197  *
5198  * Return value
5199  *        none
5200  */
5201 static void pmcraid_remove(struct pci_dev *pdev)
5202 {
5203         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5204
5205         /* remove the management interface (/dev file) for this device */
5206         pmcraid_release_chrdev(pinstance);
5207
5208         /* remove host template from scsi midlayer */
5209         scsi_remove_host(pinstance->host);
5210
5211         /* block requests from mid-layer */
5212         scsi_block_requests(pinstance->host);
5213
5214         /* initiate shutdown adapter */
5215         pmcraid_shutdown(pdev);
5216
5217         pmcraid_disable_interrupts(pinstance, ~0);
5218         flush_work(&pinstance->worker_q);
5219
5220         pmcraid_kill_tasklets(pinstance);
5221         pmcraid_unregister_interrupt_handler(pinstance);
5222         pmcraid_release_buffers(pinstance);
5223         iounmap(pinstance->mapped_dma_addr);
5224         pci_release_regions(pdev);
5225         scsi_host_put(pinstance->host);
5226         pci_disable_device(pdev);
5227
5228         return;
5229 }
5230
5231 /**
5232  * pmcraid_suspend - driver suspend entry point for power management
5233  * @dev:   Device structure
5234  *
5235  * Return Value - 0 always
5236  */
5237 static int __maybe_unused pmcraid_suspend(struct device *dev)
5238 {
5239         struct pci_dev *pdev = to_pci_dev(dev);
5240         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5241
5242         pmcraid_shutdown(pdev);
5243         pmcraid_disable_interrupts(pinstance, ~0);
5244         pmcraid_kill_tasklets(pinstance);
5245         pmcraid_unregister_interrupt_handler(pinstance);
5246
5247         return 0;
5248 }
5249
5250 /**
5251  * pmcraid_resume - driver resume entry point PCI power management
5252  * @dev: Device structure
5253  *
5254  * Return Value - 0 in case of success. Error code in case of any failure
5255  */
5256 static int __maybe_unused pmcraid_resume(struct device *dev)
5257 {
5258         struct pci_dev *pdev = to_pci_dev(dev);
5259         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5260         struct Scsi_Host *host = pinstance->host;
5261         int rc = 0;
5262
5263         if (sizeof(dma_addr_t) == 4 ||
5264             dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
5265                 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
5266
5267         if (rc == 0)
5268                 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
5269
5270         if (rc != 0) {
5271                 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5272                 goto disable_device;
5273         }
5274
5275         pmcraid_disable_interrupts(pinstance, ~0);
5276         atomic_set(&pinstance->outstanding_cmds, 0);
5277         rc = pmcraid_register_interrupt_handler(pinstance);
5278
5279         if (rc) {
5280                 dev_err(&pdev->dev,
5281                         "resume: couldn't register interrupt handlers\n");
5282                 rc = -ENODEV;
5283                 goto release_host;
5284         }
5285
5286         pmcraid_init_tasklets(pinstance);
5287         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5288
5289         /* Start with hard reset sequence which brings up IOA to operational
5290          * state as well as completes the reset sequence.
5291          */
5292         pinstance->ioa_hard_reset = 1;
5293
5294         /* Start IOA firmware initialization and bring card to Operational
5295          * state.
5296          */
5297         if (pmcraid_reset_bringup(pinstance)) {
5298                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5299                 rc = -ENODEV;
5300                 goto release_tasklets;
5301         }
5302
5303         return 0;
5304
5305 release_tasklets:
5306         pmcraid_disable_interrupts(pinstance, ~0);
5307         pmcraid_kill_tasklets(pinstance);
5308         pmcraid_unregister_interrupt_handler(pinstance);
5309
5310 release_host:
5311         scsi_host_put(host);
5312
5313 disable_device:
5314
5315         return rc;
5316 }
5317
5318 /**
5319  * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5320  *                              completion of the ioa reset
5321  * @cmd: pointer to reset command block
5322  */
5323 static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5324 {
5325         struct pmcraid_instance *pinstance = cmd->drv_inst;
5326         unsigned long flags;
5327
5328         spin_lock_irqsave(pinstance->host->host_lock, flags);
5329         pmcraid_ioa_reset(cmd);
5330         spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5331         scsi_unblock_requests(pinstance->host);
5332         schedule_work(&pinstance->worker_q);
5333 }
5334
5335 /**
5336  * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5337  *
5338  * @cmd: pointer to pmcraid_cmd structure
5339  *
5340  * Return Value
5341  *  0 for success or non-zero for failure cases
5342  */
5343 static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5344 {
5345         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5346         void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5347
5348         pmcraid_reinit_cmdblk(cmd);
5349
5350         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5351         ioarcb->request_type = REQ_TYPE_IOACMD;
5352         ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5353         ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5354
5355         /* If this was called as part of resource table reinitialization due to
5356          * lost CCN, it is enough to return the command block back to free pool
5357          * as part of set_supported_devs completion function.
5358          */
5359         if (cmd->drv_inst->reinit_cfg_table) {
5360                 cmd->drv_inst->reinit_cfg_table = 0;
5361                 cmd->release = 1;
5362                 cmd_done = pmcraid_reinit_cfgtable_done;
5363         }
5364
5365         /* we will be done with the reset sequence after set supported devices,
5366          * setup the done function to return the command block back to free
5367          * pool
5368          */
5369         pmcraid_send_cmd(cmd,
5370                          cmd_done,
5371                          PMCRAID_SET_SUP_DEV_TIMEOUT,
5372                          pmcraid_timeout_handler);
5373         return;
5374 }
5375
5376 /**
5377  * pmcraid_set_timestamp - set the timestamp to IOAFP
5378  *
5379  * @cmd: pointer to pmcraid_cmd structure
5380  *
5381  * Return Value
5382  *  0 for success or non-zero for failure cases
5383  */
5384 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5385 {
5386         struct pmcraid_instance *pinstance = cmd->drv_inst;
5387         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5388         __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5389         struct pmcraid_ioadl_desc *ioadl;
5390         u64 timestamp;
5391
5392         timestamp = ktime_get_real_seconds() * 1000;
5393
5394         pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5395         pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5396         pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5397         pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5398         pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5399         pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp)  >> 40);
5400
5401         pmcraid_reinit_cmdblk(cmd);
5402         ioarcb->request_type = REQ_TYPE_SCSI;
5403         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5404         ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5405         ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5406         memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5407
5408         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5409                                         offsetof(struct pmcraid_ioarcb,
5410                                                 add_data.u.ioadl[0]));
5411         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5412         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
5413
5414         ioarcb->request_flags0 |= NO_LINK_DESCS;
5415         ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5416         ioarcb->data_transfer_length =
5417                 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5418         ioadl = &(ioarcb->add_data.u.ioadl[0]);
5419         ioadl->flags = IOADL_FLAGS_LAST_DESC;
5420         ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5421         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5422
5423         if (!pinstance->timestamp_error) {
5424                 pinstance->timestamp_error = 0;
5425                 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5426                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5427         } else {
5428                 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5429                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5430                 return;
5431         }
5432 }
5433
5434
5435 /**
5436  * pmcraid_init_res_table - Initialize the resource table
5437  * @cmd:  pointer to pmcraid command struct
5438  *
5439  * This function looks through the existing resource table, comparing
5440  * it with the config table. This function will take care of old/new
5441  * devices and schedule adding/removing them from the mid-layer
5442  * as appropriate.
5443  *
5444  * Return value
5445  *       None
5446  */
5447 static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5448 {
5449         struct pmcraid_instance *pinstance = cmd->drv_inst;
5450         struct pmcraid_resource_entry *res, *temp;
5451         struct pmcraid_config_table_entry *cfgte;
5452         unsigned long lock_flags;
5453         int found, rc, i;
5454         u16 fw_version;
5455         LIST_HEAD(old_res);
5456
5457         if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5458                 pmcraid_err("IOA requires microcode download\n");
5459
5460         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5461
5462         /* resource list is protected by pinstance->resource_lock.
5463          * init_res_table can be called from probe (user-thread) or runtime
5464          * reset (timer/tasklet)
5465          */
5466         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5467
5468         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5469                 list_move_tail(&res->queue, &old_res);
5470
5471         for (i = 0; i < le16_to_cpu(pinstance->cfg_table->num_entries); i++) {
5472                 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5473                                                 PMCRAID_FW_VERSION_1)
5474                         cfgte = &pinstance->cfg_table->entries[i];
5475                 else
5476                         cfgte = (struct pmcraid_config_table_entry *)
5477                                         &pinstance->cfg_table->entries_ext[i];
5478
5479                 if (!pmcraid_expose_resource(fw_version, cfgte))
5480                         continue;
5481
5482                 found = 0;
5483
5484                 /* If this entry was already detected and initialized */
5485                 list_for_each_entry_safe(res, temp, &old_res, queue) {
5486
5487                         rc = memcmp(&res->cfg_entry.resource_address,
5488                                     &cfgte->resource_address,
5489                                     sizeof(cfgte->resource_address));
5490                         if (!rc) {
5491                                 list_move_tail(&res->queue,
5492                                                 &pinstance->used_res_q);
5493                                 found = 1;
5494                                 break;
5495                         }
5496                 }
5497
5498                 /* If this is new entry, initialize it and add it the queue */
5499                 if (!found) {
5500
5501                         if (list_empty(&pinstance->free_res_q)) {
5502                                 pmcraid_err("Too many devices attached\n");
5503                                 break;
5504                         }
5505
5506                         found = 1;
5507                         res = list_entry(pinstance->free_res_q.next,
5508                                          struct pmcraid_resource_entry, queue);
5509
5510                         res->scsi_dev = NULL;
5511                         res->change_detected = RES_CHANGE_ADD;
5512                         res->reset_progress = 0;
5513                         list_move_tail(&res->queue, &pinstance->used_res_q);
5514                 }
5515
5516                 /* copy new configuration table entry details into driver
5517                  * maintained resource entry
5518                  */
5519                 if (found) {
5520                         memcpy(&res->cfg_entry, cfgte,
5521                                         pinstance->config_table_entry_size);
5522                         pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5523                                  res->cfg_entry.resource_type,
5524                                  (fw_version <= PMCRAID_FW_VERSION_1 ?
5525                                         res->cfg_entry.unique_flags1 :
5526                                         le16_to_cpu(res->cfg_entry.array_id) & 0xFF),
5527                                  le32_to_cpu(res->cfg_entry.resource_address));
5528                 }
5529         }
5530
5531         /* Detect any deleted entries, mark them for deletion from mid-layer */
5532         list_for_each_entry_safe(res, temp, &old_res, queue) {
5533
5534                 if (res->scsi_dev) {
5535                         res->change_detected = RES_CHANGE_DEL;
5536                         res->cfg_entry.resource_handle =
5537                                 PMCRAID_INVALID_RES_HANDLE;
5538                         list_move_tail(&res->queue, &pinstance->used_res_q);
5539                 } else {
5540                         list_move_tail(&res->queue, &pinstance->free_res_q);
5541                 }
5542         }
5543
5544         /* release the resource list lock */
5545         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5546         pmcraid_set_timestamp(cmd);
5547 }
5548
5549 /**
5550  * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5551  * @cmd: pointer pmcraid_cmd struct
5552  *
5553  * This function sends a Query IOA Configuration command to the adapter to
5554  * retrieve the IOA configuration table.
5555  *
5556  * Return value:
5557  *      none
5558  */
5559 static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5560 {
5561         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5562         struct pmcraid_ioadl_desc *ioadl;
5563         struct pmcraid_instance *pinstance = cmd->drv_inst;
5564         __be32 cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5565
5566         if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5567                                         PMCRAID_FW_VERSION_1)
5568                 pinstance->config_table_entry_size =
5569                         sizeof(struct pmcraid_config_table_entry);
5570         else
5571                 pinstance->config_table_entry_size =
5572                         sizeof(struct pmcraid_config_table_entry_ext);
5573
5574         ioarcb->request_type = REQ_TYPE_IOACMD;
5575         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5576
5577         ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5578
5579         /* firmware requires 4-byte length field, specified in B.E format */
5580         memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5581
5582         /* Since entire config table can be described by single IOADL, it can
5583          * be part of IOARCB itself
5584          */
5585         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5586                                         offsetof(struct pmcraid_ioarcb,
5587                                                 add_data.u.ioadl[0]));
5588         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5589         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
5590
5591         ioarcb->request_flags0 |= NO_LINK_DESCS;
5592         ioarcb->data_transfer_length =
5593                 cpu_to_le32(sizeof(struct pmcraid_config_table));
5594
5595         ioadl = &(ioarcb->add_data.u.ioadl[0]);
5596         ioadl->flags = IOADL_FLAGS_LAST_DESC;
5597         ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5598         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5599
5600         pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5601                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5602 }
5603
5604
5605 /**
5606  * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5607  * @pdev: pointer to pci device structure
5608  * @dev_id: pointer to device ids structure
5609  *
5610  * Return Value
5611  *      returns 0 if the device is claimed and successfully configured.
5612  *      returns non-zero error code in case of any failure
5613  */
5614 static int pmcraid_probe(struct pci_dev *pdev,
5615                          const struct pci_device_id *dev_id)
5616 {
5617         struct pmcraid_instance *pinstance;
5618         struct Scsi_Host *host;
5619         void __iomem *mapped_pci_addr;
5620         int rc = PCIBIOS_SUCCESSFUL;
5621
5622         if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5623                 pmcraid_err
5624                         ("maximum number(%d) of supported adapters reached\n",
5625                          atomic_read(&pmcraid_adapter_count));
5626                 return -ENOMEM;
5627         }
5628
5629         atomic_inc(&pmcraid_adapter_count);
5630         rc = pci_enable_device(pdev);
5631
5632         if (rc) {
5633                 dev_err(&pdev->dev, "Cannot enable adapter\n");
5634                 atomic_dec(&pmcraid_adapter_count);
5635                 return rc;
5636         }
5637
5638         dev_info(&pdev->dev,
5639                 "Found new IOA(%x:%x), Total IOA count: %d\n",
5640                  pdev->vendor, pdev->device,
5641                  atomic_read(&pmcraid_adapter_count));
5642
5643         rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5644
5645         if (rc < 0) {
5646                 dev_err(&pdev->dev,
5647                         "Couldn't register memory range of registers\n");
5648                 goto out_disable_device;
5649         }
5650
5651         mapped_pci_addr = pci_iomap(pdev, 0, 0);
5652
5653         if (!mapped_pci_addr) {
5654                 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5655                 rc = -ENOMEM;
5656                 goto out_release_regions;
5657         }
5658
5659         pci_set_master(pdev);
5660
5661         /* Firmware requires the system bus address of IOARCB to be within
5662          * 32-bit addressable range though it has 64-bit IOARRIN register.
5663          * However, firmware supports 64-bit streaming DMA buffers, whereas
5664          * coherent buffers are to be 32-bit. Since dma_alloc_coherent always
5665          * returns memory within 4GB (if not, change this logic), coherent
5666          * buffers are within firmware acceptable address ranges.
5667          */
5668         if (sizeof(dma_addr_t) == 4 ||
5669             dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
5670                 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
5671
5672         /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5673          * bit mask for dma_alloc_coherent to return addresses within 4GB
5674          */
5675         if (rc == 0)
5676                 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
5677
5678         if (rc != 0) {
5679                 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5680                 goto cleanup_nomem;
5681         }
5682
5683         host = scsi_host_alloc(&pmcraid_host_template,
5684                                 sizeof(struct pmcraid_instance));
5685
5686         if (!host) {
5687                 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5688                 rc = -ENOMEM;
5689                 goto cleanup_nomem;
5690         }
5691
5692         host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5693         host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5694         host->unique_id = host->host_no;
5695         host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5696         host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5697
5698         /* zero out entire instance structure */
5699         pinstance = (struct pmcraid_instance *)host->hostdata;
5700         memset(pinstance, 0, sizeof(*pinstance));
5701
5702         pinstance->chip_cfg =
5703                 (struct pmcraid_chip_details *)(dev_id->driver_data);
5704
5705         rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5706
5707         if (rc < 0) {
5708                 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5709                 goto out_scsi_host_put;
5710         }
5711
5712         pci_set_drvdata(pdev, pinstance);
5713
5714         /* Save PCI config-space for use following the reset */
5715         rc = pci_save_state(pinstance->pdev);
5716
5717         if (rc != 0) {
5718                 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5719                 goto out_scsi_host_put;
5720         }
5721
5722         pmcraid_disable_interrupts(pinstance, ~0);
5723
5724         rc = pmcraid_register_interrupt_handler(pinstance);
5725
5726         if (rc) {
5727                 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
5728                 goto out_scsi_host_put;
5729         }
5730
5731         pmcraid_init_tasklets(pinstance);
5732
5733         /* allocate verious buffers used by LLD.*/
5734         rc = pmcraid_init_buffers(pinstance);
5735
5736         if (rc) {
5737                 pmcraid_err("couldn't allocate memory blocks\n");
5738                 goto out_unregister_isr;
5739         }
5740
5741         /* check the reset type required */
5742         pmcraid_reset_type(pinstance);
5743
5744         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5745
5746         /* Start IOA firmware initialization and bring card to Operational
5747          * state.
5748          */
5749         pmcraid_info("starting IOA initialization sequence\n");
5750         if (pmcraid_reset_bringup(pinstance)) {
5751                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5752                 rc = 1;
5753                 goto out_release_bufs;
5754         }
5755
5756         /* Add adapter instance into mid-layer list */
5757         rc = scsi_add_host(pinstance->host, &pdev->dev);
5758         if (rc != 0) {
5759                 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
5760                 goto out_release_bufs;
5761         }
5762
5763         scsi_scan_host(pinstance->host);
5764
5765         rc = pmcraid_setup_chrdev(pinstance);
5766
5767         if (rc != 0) {
5768                 pmcraid_err("couldn't create mgmt interface, error: %x\n",
5769                              rc);
5770                 goto out_remove_host;
5771         }
5772
5773         /* Schedule worker thread to handle CCN and take care of adding and
5774          * removing devices to OS
5775          */
5776         atomic_set(&pinstance->expose_resources, 1);
5777         schedule_work(&pinstance->worker_q);
5778         return rc;
5779
5780 out_remove_host:
5781         scsi_remove_host(host);
5782
5783 out_release_bufs:
5784         pmcraid_release_buffers(pinstance);
5785
5786 out_unregister_isr:
5787         pmcraid_kill_tasklets(pinstance);
5788         pmcraid_unregister_interrupt_handler(pinstance);
5789
5790 out_scsi_host_put:
5791         scsi_host_put(host);
5792
5793 cleanup_nomem:
5794         iounmap(mapped_pci_addr);
5795
5796 out_release_regions:
5797         pci_release_regions(pdev);
5798
5799 out_disable_device:
5800         atomic_dec(&pmcraid_adapter_count);
5801         pci_disable_device(pdev);
5802         return -ENODEV;
5803 }
5804
5805 static SIMPLE_DEV_PM_OPS(pmcraid_pm_ops, pmcraid_suspend, pmcraid_resume);
5806
5807 /*
5808  * PCI driver structure of pmcraid driver
5809  */
5810 static struct pci_driver pmcraid_driver = {
5811         .name = PMCRAID_DRIVER_NAME,
5812         .id_table = pmcraid_pci_table,
5813         .probe = pmcraid_probe,
5814         .remove = pmcraid_remove,
5815         .driver.pm = &pmcraid_pm_ops,
5816         .shutdown = pmcraid_shutdown
5817 };
5818
5819 /**
5820  * pmcraid_init - module load entry point
5821  */
5822 static int __init pmcraid_init(void)
5823 {
5824         dev_t dev;
5825         int error;
5826
5827         pmcraid_info("%s Device Driver version: %s\n",
5828                          PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
5829
5830         error = alloc_chrdev_region(&dev, 0,
5831                                     PMCRAID_MAX_ADAPTERS,
5832                                     PMCRAID_DEVFILE);
5833
5834         if (error) {
5835                 pmcraid_err("failed to get a major number for adapters\n");
5836                 goto out_init;
5837         }
5838
5839         pmcraid_major = MAJOR(dev);
5840         pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
5841
5842         if (IS_ERR(pmcraid_class)) {
5843                 error = PTR_ERR(pmcraid_class);
5844                 pmcraid_err("failed to register with sysfs, error = %x\n",
5845                             error);
5846                 goto out_unreg_chrdev;
5847         }
5848
5849         error = pmcraid_netlink_init();
5850
5851         if (error) {
5852                 class_destroy(pmcraid_class);
5853                 goto out_unreg_chrdev;
5854         }
5855
5856         error = pci_register_driver(&pmcraid_driver);
5857
5858         if (error == 0)
5859                 goto out_init;
5860
5861         pmcraid_err("failed to register pmcraid driver, error = %x\n",
5862                      error);
5863         class_destroy(pmcraid_class);
5864         pmcraid_netlink_release();
5865
5866 out_unreg_chrdev:
5867         unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
5868
5869 out_init:
5870         return error;
5871 }
5872
5873 /**
5874  * pmcraid_exit - module unload entry point
5875  */
5876 static void __exit pmcraid_exit(void)
5877 {
5878         pmcraid_netlink_release();
5879         unregister_chrdev_region(MKDEV(pmcraid_major, 0),
5880                                  PMCRAID_MAX_ADAPTERS);
5881         pci_unregister_driver(&pmcraid_driver);
5882         class_destroy(pmcraid_class);
5883 }
5884
5885 module_init(pmcraid_init);
5886 module_exit(pmcraid_exit);