1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* ------------------------------------------------------------
4 * (C) Copyright IBM Corporation 1994, 2004
5 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
6 * Santiago Leon (santil@us.ibm.com)
7 * Dave Boutcher (sleddog@us.ibm.com)
9 * ------------------------------------------------------------
10 * Emulation of a SCSI host adapter for Virtual I/O devices
12 * This driver supports the SCSI adapter implemented by the IBM
13 * Power5 firmware. That SCSI adapter is not a physical adapter,
14 * but allows Linux SCSI peripheral drivers to directly
15 * access devices in another logical partition on the physical system.
17 * The virtual adapter(s) are present in the open firmware device
18 * tree just like real adapters.
20 * One of the capabilities provided on these systems is the ability
21 * to DMA between partitions. The architecture states that for VSCSI,
22 * the server side is allowed to DMA to and from the client. The client
23 * is never trusted to DMA to or from the server directly.
25 * Messages are sent between partitions on a "Command/Response Queue"
26 * (CRQ), which is just a buffer of 16 byte entries in the receiver's
27 * Senders cannot access the buffer directly, but send messages by
28 * making a hypervisor call and passing in the 16 bytes. The hypervisor
29 * puts the message in the next 16 byte space in round-robin fashion,
30 * turns on the high order bit of the message (the valid bit), and
31 * generates an interrupt to the receiver (if interrupts are turned on.)
32 * The receiver just turns off the valid bit when they have copied out
35 * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
36 * (IU) (as defined in the T10 standard available at www.t10.org), gets
37 * a DMA address for the message, and sends it to the server as the
38 * payload of a CRQ message. The server DMAs the SRP IU and processes it,
39 * including doing any additional data transfers. When it is done, it
40 * DMAs the SRP response back to the same address as the request came from,
41 * and sends a CRQ message back to inform the client that the request has
44 * TODO: This is currently pretty tied to the IBM pSeries hypervisor
45 * interfaces. It would be really nice to abstract this above an RDMA
49 #include <linux/module.h>
50 #include <linux/moduleparam.h>
51 #include <linux/dma-mapping.h>
52 #include <linux/delay.h>
53 #include <linux/slab.h>
56 #include <linux/kthread.h>
57 #include <asm/firmware.h>
59 #include <scsi/scsi.h>
60 #include <scsi/scsi_cmnd.h>
61 #include <scsi/scsi_host.h>
62 #include <scsi/scsi_device.h>
63 #include <scsi/scsi_transport_srp.h>
66 /* The values below are somewhat arbitrary default values, but
67 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
68 * Note that there are 3 bits of channel value, 6 bits of id, and
71 static int max_id = 64;
72 static int max_channel = 3;
73 static int init_timeout = 300;
74 static int login_timeout = 60;
75 static int info_timeout = 30;
76 static int abort_timeout = 60;
77 static int reset_timeout = 60;
78 static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
79 static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
80 static int fast_fail = 1;
81 static int client_reserve = 1;
82 static char partition_name[96] = "UNKNOWN";
83 static unsigned int partition_number = -1;
84 static LIST_HEAD(ibmvscsi_head);
85 static DEFINE_SPINLOCK(ibmvscsi_driver_lock);
87 static struct scsi_transport_template *ibmvscsi_transport_template;
89 #define IBMVSCSI_VERSION "1.5.9"
91 MODULE_DESCRIPTION("IBM Virtual SCSI");
92 MODULE_AUTHOR("Dave Boutcher");
93 MODULE_LICENSE("GPL");
94 MODULE_VERSION(IBMVSCSI_VERSION);
96 module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
97 MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]");
98 module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
99 MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]");
100 module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
101 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
102 module_param_named(max_requests, max_requests, int, S_IRUGO);
103 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
104 module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
105 MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
106 module_param_named(client_reserve, client_reserve, int, S_IRUGO );
107 MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
109 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
110 struct ibmvscsi_host_data *hostdata);
112 /* ------------------------------------------------------------
113 * Routines for managing the command/response queue
116 * ibmvscsi_handle_event: - Interrupt handler for crq events
117 * @irq: number of irq to handle, not used
118 * @dev_instance: ibmvscsi_host_data of host that received interrupt
120 * Disables interrupts and schedules srp_task
121 * Always returns IRQ_HANDLED
123 static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
125 struct ibmvscsi_host_data *hostdata =
126 (struct ibmvscsi_host_data *)dev_instance;
127 vio_disable_interrupts(to_vio_dev(hostdata->dev));
128 tasklet_schedule(&hostdata->srp_task);
133 * ibmvscsi_release_crq_queue() - Deallocates data and unregisters CRQ
134 * @queue: crq_queue to initialize and register
135 * @hostdata: ibmvscsi_host_data of host
136 * @max_requests: maximum requests (unused)
138 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
139 * the crq with the hypervisor.
141 static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
142 struct ibmvscsi_host_data *hostdata,
146 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
147 free_irq(vdev->irq, (void *)hostdata);
148 tasklet_kill(&hostdata->srp_task);
152 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
153 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
154 dma_unmap_single(hostdata->dev,
156 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
157 free_page((unsigned long)queue->msgs);
161 * crq_queue_next_crq: - Returns the next entry in message queue
162 * @queue: crq_queue to use
164 * Returns pointer to next entry in queue, or NULL if there are no new
165 * entried in the CRQ.
167 static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
169 struct viosrp_crq *crq;
172 spin_lock_irqsave(&queue->lock, flags);
173 crq = &queue->msgs[queue->cur];
174 if (crq->valid != VIOSRP_CRQ_FREE) {
175 if (++queue->cur == queue->size)
178 /* Ensure the read of the valid bit occurs before reading any
179 * other bits of the CRQ entry
184 spin_unlock_irqrestore(&queue->lock, flags);
190 * ibmvscsi_send_crq: - Send a CRQ
191 * @hostdata: the adapter
192 * @word1: the first 64 bits of the data
193 * @word2: the second 64 bits of the data
195 static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
196 u64 word1, u64 word2)
198 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
201 * Ensure the command buffer is flushed to memory before handing it
202 * over to the VIOS to prevent it from fetching any stale data.
205 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
209 * ibmvscsi_task: - Process srps asynchronously
210 * @data: ibmvscsi_host_data of host
212 static void ibmvscsi_task(void *data)
214 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
215 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
216 struct viosrp_crq *crq;
220 /* Pull all the valid messages off the CRQ */
221 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
222 ibmvscsi_handle_crq(crq, hostdata);
223 crq->valid = VIOSRP_CRQ_FREE;
227 vio_enable_interrupts(vdev);
228 crq = crq_queue_next_crq(&hostdata->queue);
230 vio_disable_interrupts(vdev);
231 ibmvscsi_handle_crq(crq, hostdata);
232 crq->valid = VIOSRP_CRQ_FREE;
240 static void gather_partition_info(void)
242 const char *ppartition_name;
243 const __be32 *p_number_ptr;
245 /* Retrieve information about this partition */
249 of_node_get(of_root);
251 ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);
253 strlcpy(partition_name, ppartition_name,
254 sizeof(partition_name));
255 p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);
257 partition_number = of_read_number(p_number_ptr, 1);
258 of_node_put(of_root);
261 static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
263 memset(&hostdata->madapter_info, 0x00,
264 sizeof(hostdata->madapter_info));
266 dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
267 strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
269 strncpy(hostdata->madapter_info.partition_name, partition_name,
270 sizeof(hostdata->madapter_info.partition_name));
272 hostdata->madapter_info.partition_number =
273 cpu_to_be32(partition_number);
275 hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1);
276 hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX);
280 * ibmvscsi_reset_crq_queue() - resets a crq after a failure
281 * @queue: crq_queue to initialize and register
282 * @hostdata: ibmvscsi_host_data of host
284 static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
285 struct ibmvscsi_host_data *hostdata)
288 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
294 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
295 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
297 /* Clean out the queue */
298 memset(queue->msgs, 0x00, PAGE_SIZE);
301 set_adapter_info(hostdata);
303 /* And re-open it again */
304 rc = plpar_hcall_norets(H_REG_CRQ,
306 queue->msg_token, PAGE_SIZE);
307 if (rc == H_CLOSED) {
308 /* Adapter is good, but other end is not ready */
309 dev_warn(hostdata->dev, "Partner adapter not ready\n");
310 } else if (rc != 0) {
311 dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
317 * ibmvscsi_init_crq_queue() - Initializes and registers CRQ with hypervisor
318 * @queue: crq_queue to initialize and register
319 * @hostdata: ibmvscsi_host_data of host
320 * @max_requests: maximum requests (unused)
322 * Allocates a page for messages, maps it for dma, and registers
323 * the crq with the hypervisor.
324 * Returns zero on success.
326 static int ibmvscsi_init_crq_queue(struct crq_queue *queue,
327 struct ibmvscsi_host_data *hostdata,
332 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
334 queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
338 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
340 queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
341 queue->size * sizeof(*queue->msgs),
344 if (dma_mapping_error(hostdata->dev, queue->msg_token))
347 gather_partition_info();
348 set_adapter_info(hostdata);
350 retrc = rc = plpar_hcall_norets(H_REG_CRQ,
352 queue->msg_token, PAGE_SIZE);
353 if (rc == H_RESOURCE)
354 /* maybe kexecing and resource is busy. try a reset */
355 rc = ibmvscsi_reset_crq_queue(queue,
358 if (rc == H_CLOSED) {
359 /* Adapter is good, but other end is not ready */
360 dev_warn(hostdata->dev, "Partner adapter not ready\n");
362 } else if (rc != 0) {
363 dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
368 spin_lock_init(&queue->lock);
370 tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
371 (unsigned long)hostdata);
373 if (request_irq(vdev->irq,
374 ibmvscsi_handle_event,
375 0, "ibmvscsi", (void *)hostdata) != 0) {
376 dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
381 rc = vio_enable_interrupts(vdev);
383 dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
390 tasklet_kill(&hostdata->srp_task);
395 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
396 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
398 dma_unmap_single(hostdata->dev,
400 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
402 free_page((unsigned long)queue->msgs);
408 * ibmvscsi_reenable_crq_queue() - reenables a crq after
409 * @queue: crq_queue to initialize and register
410 * @hostdata: ibmvscsi_host_data of host
412 static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
413 struct ibmvscsi_host_data *hostdata)
416 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
418 set_adapter_info(hostdata);
420 /* Re-enable the CRQ */
424 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
425 } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
428 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
432 /* ------------------------------------------------------------
433 * Routines for the event pool and event structs
436 * initialize_event_pool: - Allocates and initializes the event pool for a host
437 * @pool: event_pool to be initialized
438 * @size: Number of events in pool
439 * @hostdata: ibmvscsi_host_data who owns the event pool
441 * Returns zero on success.
443 static int initialize_event_pool(struct event_pool *pool,
444 int size, struct ibmvscsi_host_data *hostdata)
450 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
455 dma_alloc_coherent(hostdata->dev,
456 pool->size * sizeof(*pool->iu_storage),
458 if (!pool->iu_storage) {
463 for (i = 0; i < pool->size; ++i) {
464 struct srp_event_struct *evt = &pool->events[i];
465 memset(&evt->crq, 0x00, sizeof(evt->crq));
466 atomic_set(&evt->free, 1);
467 evt->crq.valid = VIOSRP_CRQ_CMD_RSP;
468 evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));
469 evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +
470 sizeof(*evt->xfer_iu) * i);
471 evt->xfer_iu = pool->iu_storage + i;
472 evt->hostdata = hostdata;
473 evt->ext_list = NULL;
474 evt->ext_list_token = 0;
481 * release_event_pool() - Frees memory of an event pool of a host
482 * @pool: event_pool to be released
483 * @hostdata: ibmvscsi_host_data who owns the even pool
485 * Returns zero on success.
487 static void release_event_pool(struct event_pool *pool,
488 struct ibmvscsi_host_data *hostdata)
491 for (i = 0; i < pool->size; ++i) {
492 if (atomic_read(&pool->events[i].free) != 1)
494 if (pool->events[i].ext_list) {
495 dma_free_coherent(hostdata->dev,
496 SG_ALL * sizeof(struct srp_direct_buf),
497 pool->events[i].ext_list,
498 pool->events[i].ext_list_token);
502 dev_warn(hostdata->dev, "releasing event pool with %d "
503 "events still in use?\n", in_use);
505 dma_free_coherent(hostdata->dev,
506 pool->size * sizeof(*pool->iu_storage),
507 pool->iu_storage, pool->iu_token);
511 * valid_event_struct: - Determines if event is valid.
512 * @pool: event_pool that contains the event
513 * @evt: srp_event_struct to be checked for validity
515 * Returns zero if event is invalid, one otherwise.
517 static int valid_event_struct(struct event_pool *pool,
518 struct srp_event_struct *evt)
520 int index = evt - pool->events;
521 if (index < 0 || index >= pool->size) /* outside of bounds */
523 if (evt != pool->events + index) /* unaligned */
529 * free_event_struct() - Changes status of event to "free"
530 * @pool: event_pool that contains the event
531 * @evt: srp_event_struct to be modified
533 static void free_event_struct(struct event_pool *pool,
534 struct srp_event_struct *evt)
536 if (!valid_event_struct(pool, evt)) {
537 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
538 "(not in pool %p)\n", evt, pool->events);
541 if (atomic_inc_return(&evt->free) != 1) {
542 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
543 "which is not in use!\n", evt);
549 * get_event_struct() - Gets the next free event in pool
550 * @pool: event_pool that contains the events to be searched
552 * Returns the next event in "free" state, and NULL if none are free.
553 * Note that no synchronization is done here, we assume the host_lock
554 * will syncrhonze things.
556 static struct srp_event_struct *get_event_struct(struct event_pool *pool)
559 int poolsize = pool->size;
560 int offset = pool->next;
562 for (i = 0; i < poolsize; i++) {
563 offset = (offset + 1) % poolsize;
564 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
566 return &pool->events[offset];
570 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
575 * init_event_struct: Initialize fields in an event struct that are always
577 * @evt_struct: The event
578 * @done: Routine to call when the event is responded to
579 * @format: SRP or MAD format
580 * @timeout: timeout value set in the CRQ
582 static void init_event_struct(struct srp_event_struct *evt_struct,
583 void (*done) (struct srp_event_struct *),
587 evt_struct->cmnd = NULL;
588 evt_struct->cmnd_done = NULL;
589 evt_struct->sync_srp = NULL;
590 evt_struct->crq.format = format;
591 evt_struct->crq.timeout = cpu_to_be16(timeout);
592 evt_struct->done = done;
595 /* ------------------------------------------------------------
596 * Routines for receiving SCSI responses from the hosting partition
600 * set_srp_direction: Set the fields in the srp related to data
601 * direction and number of buffers based on the direction in
602 * the scsi_cmnd and the number of buffers
604 static void set_srp_direction(struct scsi_cmnd *cmd,
605 struct srp_cmd *srp_cmd,
614 fmt = SRP_DATA_DESC_DIRECT;
616 fmt = SRP_DATA_DESC_INDIRECT;
617 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
619 if (cmd->sc_data_direction == DMA_TO_DEVICE)
620 srp_cmd->data_out_desc_cnt = numbuf;
622 srp_cmd->data_in_desc_cnt = numbuf;
625 if (cmd->sc_data_direction == DMA_TO_DEVICE)
626 srp_cmd->buf_fmt = fmt << 4;
628 srp_cmd->buf_fmt = fmt;
632 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
633 * @cmd: srp_cmd whose additional_data member will be unmapped
634 * @evt_struct: the event
635 * @dev: device for which the memory is mapped
637 static void unmap_cmd_data(struct srp_cmd *cmd,
638 struct srp_event_struct *evt_struct,
643 out_fmt = cmd->buf_fmt >> 4;
644 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
646 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
649 if (evt_struct->cmnd)
650 scsi_dma_unmap(evt_struct->cmnd);
653 static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
654 struct srp_direct_buf *md)
657 struct scatterlist *sg;
658 u64 total_length = 0;
660 scsi_for_each_sg(cmd, sg, nseg, i) {
661 struct srp_direct_buf *descr = md + i;
662 descr->va = cpu_to_be64(sg_dma_address(sg));
663 descr->len = cpu_to_be32(sg_dma_len(sg));
665 total_length += sg_dma_len(sg);
671 * map_sg_data: - Maps dma for a scatterlist and initializes descriptor fields
672 * @cmd: struct scsi_cmnd with the scatterlist
673 * @evt_struct: struct srp_event_struct to map
674 * @srp_cmd: srp_cmd that contains the memory descriptor
675 * @dev: device for which to map dma memory
677 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
678 * Returns 1 on success.
680 static int map_sg_data(struct scsi_cmnd *cmd,
681 struct srp_event_struct *evt_struct,
682 struct srp_cmd *srp_cmd, struct device *dev)
686 u64 total_length = 0;
687 struct srp_direct_buf *data =
688 (struct srp_direct_buf *) srp_cmd->add_data;
689 struct srp_indirect_buf *indirect =
690 (struct srp_indirect_buf *) data;
692 sg_mapped = scsi_dma_map(cmd);
695 else if (sg_mapped < 0)
698 set_srp_direction(cmd, srp_cmd, sg_mapped);
700 /* special case; we can use a single direct descriptor */
701 if (sg_mapped == 1) {
702 map_sg_list(cmd, sg_mapped, data);
706 indirect->table_desc.va = 0;
707 indirect->table_desc.len = cpu_to_be32(sg_mapped *
708 sizeof(struct srp_direct_buf));
709 indirect->table_desc.key = 0;
711 if (sg_mapped <= MAX_INDIRECT_BUFS) {
712 total_length = map_sg_list(cmd, sg_mapped,
713 &indirect->desc_list[0]);
714 indirect->len = cpu_to_be32(total_length);
718 /* get indirect table */
719 if (!evt_struct->ext_list) {
720 evt_struct->ext_list = dma_alloc_coherent(dev,
721 SG_ALL * sizeof(struct srp_direct_buf),
722 &evt_struct->ext_list_token, 0);
723 if (!evt_struct->ext_list) {
724 if (!firmware_has_feature(FW_FEATURE_CMO))
725 sdev_printk(KERN_ERR, cmd->device,
726 "Can't allocate memory "
727 "for indirect table\n");
733 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
735 indirect->len = cpu_to_be32(total_length);
736 indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token);
737 indirect->table_desc.len = cpu_to_be32(sg_mapped *
738 sizeof(indirect->desc_list[0]));
739 memcpy(indirect->desc_list, evt_struct->ext_list,
740 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
745 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
746 * @cmd: struct scsi_cmnd with the memory to be mapped
747 * @evt_struct: struct srp_event_struct to map
748 * @srp_cmd: srp_cmd that contains the memory descriptor
749 * @dev: dma device for which to map dma memory
751 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
752 * Returns 1 on success.
754 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
755 struct srp_event_struct *evt_struct,
756 struct srp_cmd *srp_cmd, struct device *dev)
758 switch (cmd->sc_data_direction) {
759 case DMA_FROM_DEVICE:
764 case DMA_BIDIRECTIONAL:
765 sdev_printk(KERN_ERR, cmd->device,
766 "Can't map DMA_BIDIRECTIONAL to read/write\n");
769 sdev_printk(KERN_ERR, cmd->device,
770 "Unknown data direction 0x%02x; can't map!\n",
771 cmd->sc_data_direction);
775 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
779 * purge_requests: Our virtual adapter just shut down. purge any sent requests
780 * @hostdata: the adapter
781 * @error_code: error code to return as the 'result'
783 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
785 struct srp_event_struct *evt;
788 spin_lock_irqsave(hostdata->host->host_lock, flags);
789 while (!list_empty(&hostdata->sent)) {
790 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
791 list_del(&evt->list);
792 del_timer(&evt->timer);
794 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
796 evt->cmnd->result = (error_code << 16);
797 unmap_cmd_data(&evt->iu.srp.cmd, evt,
800 evt->cmnd_done(evt->cmnd);
801 } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&
802 evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
804 free_event_struct(&evt->hostdata->pool, evt);
805 spin_lock_irqsave(hostdata->host->host_lock, flags);
807 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
811 * ibmvscsi_set_request_limit - Set the adapter request_limit in response to
812 * an adapter failure, reset, or SRP Login. Done under host lock to prevent
813 * race with SCSI command submission.
814 * @hostdata: adapter to adjust
815 * @limit: new request limit
817 static void ibmvscsi_set_request_limit(struct ibmvscsi_host_data *hostdata, int limit)
821 spin_lock_irqsave(hostdata->host->host_lock, flags);
822 atomic_set(&hostdata->request_limit, limit);
823 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
827 * ibmvscsi_reset_host - Reset the connection to the server
828 * @hostdata: struct ibmvscsi_host_data to reset
830 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
832 scsi_block_requests(hostdata->host);
833 ibmvscsi_set_request_limit(hostdata, 0);
835 purge_requests(hostdata, DID_ERROR);
836 hostdata->action = IBMVSCSI_HOST_ACTION_RESET;
837 wake_up(&hostdata->work_wait_q);
841 * ibmvscsi_timeout - Internal command timeout handler
842 * @t: struct srp_event_struct that timed out
844 * Called when an internally generated command times out
846 static void ibmvscsi_timeout(struct timer_list *t)
848 struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer);
849 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
851 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
852 evt_struct->iu.srp.cmd.opcode);
854 ibmvscsi_reset_host(hostdata);
858 /* ------------------------------------------------------------
859 * Routines for sending and receiving SRPs
862 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
863 * @evt_struct: evt_struct to be sent
864 * @hostdata: ibmvscsi_host_data of host
865 * @timeout: timeout in seconds - 0 means do not time command
867 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
868 * Note that this routine assumes that host_lock is held for synchronization
870 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
871 struct ibmvscsi_host_data *hostdata,
872 unsigned long timeout)
874 __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq;
875 int request_status = 0;
879 /* If we have exhausted our request limit, just fail this request,
880 * unless it is for a reset or abort.
881 * Note that there are rare cases involving driver generated requests
882 * (such as task management requests) that the mid layer may think we
883 * can handle more requests (can_queue) when we actually can't
885 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
888 atomic_dec_if_positive(&hostdata->request_limit);
889 /* If request limit was -1 when we started, it is now even
892 if (request_status < -1)
894 /* Otherwise, we may have run out of requests. */
895 /* If request limit was 0 when we started the adapter is in the
896 * process of performing a login with the server adapter, or
897 * we may have run out of requests.
899 else if (request_status == -1 &&
900 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
902 /* Abort and reset calls should make it through.
903 * Nothing except abort and reset should use the last two
904 * slots unless we had two or less to begin with.
906 else if (request_status < 2 &&
907 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
908 /* In the case that we have less than two requests
909 * available, check the server limit as a combination
910 * of the request limit and the number of requests
911 * in-flight (the size of the send list). If the
912 * server limit is greater than 2, return busy so
913 * that the last two are reserved for reset and abort.
915 int server_limit = request_status;
916 struct srp_event_struct *tmp_evt;
918 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
922 if (server_limit > 2)
927 /* Copy the IU into the transfer area */
928 *evt_struct->xfer_iu = evt_struct->iu;
929 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
931 /* Add this to the sent list. We need to do this
932 * before we actually send
933 * in case it comes back REALLY fast
935 list_add_tail(&evt_struct->list, &hostdata->sent);
937 timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0);
939 evt_struct->timer.expires = jiffies + (timeout * HZ);
940 add_timer(&evt_struct->timer);
943 rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]),
944 be64_to_cpu(crq_as_u64[1]));
946 list_del(&evt_struct->list);
947 del_timer(&evt_struct->timer);
949 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
950 * Firmware will send a CRQ with a transport event (0xFF) to
951 * tell this client what has happened to the transport. This
952 * will be handled in ibmvscsi_handle_crq()
954 if (rc == H_CLOSED) {
955 dev_warn(hostdata->dev, "send warning. "
956 "Receive queue closed, will retry.\n");
959 dev_err(hostdata->dev, "send error %d\n", rc);
961 atomic_inc(&hostdata->request_limit);
968 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
970 free_event_struct(&hostdata->pool, evt_struct);
971 if (srp_req && request_status != -1)
972 atomic_inc(&hostdata->request_limit);
973 return SCSI_MLQUEUE_HOST_BUSY;
976 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
978 if (evt_struct->cmnd != NULL) {
979 evt_struct->cmnd->result = DID_ERROR << 16;
980 evt_struct->cmnd_done(evt_struct->cmnd);
981 } else if (evt_struct->done)
982 evt_struct->done(evt_struct);
984 free_event_struct(&hostdata->pool, evt_struct);
989 * handle_cmd_rsp: - Handle responses from commands
990 * @evt_struct: srp_event_struct to be handled
992 * Used as a callback by when sending scsi cmds.
993 * Gets called by ibmvscsi_handle_crq()
995 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
997 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
998 struct scsi_cmnd *cmnd = evt_struct->cmnd;
1000 if (unlikely(rsp->opcode != SRP_RSP)) {
1001 if (printk_ratelimit())
1002 dev_warn(evt_struct->hostdata->dev,
1003 "bad SRP RSP type %#02x\n", rsp->opcode);
1007 cmnd->result |= rsp->status;
1008 if (scsi_status_is_check_condition(cmnd->result))
1009 memcpy(cmnd->sense_buffer,
1011 be32_to_cpu(rsp->sense_data_len));
1012 unmap_cmd_data(&evt_struct->iu.srp.cmd,
1014 evt_struct->hostdata->dev);
1016 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
1017 scsi_set_resid(cmnd,
1018 be32_to_cpu(rsp->data_out_res_cnt));
1019 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
1020 scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt));
1023 if (evt_struct->cmnd_done)
1024 evt_struct->cmnd_done(cmnd);
1028 * lun_from_dev: - Returns the lun of the scsi device
1029 * @dev: struct scsi_device
1032 static inline u16 lun_from_dev(struct scsi_device *dev)
1034 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
1038 * ibmvscsi_queuecommand_lck() - The queuecommand function of the scsi template
1039 * @cmnd: struct scsi_cmnd to be executed
1040 * @done: Callback function to be called when cmd is completed
1042 static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
1043 void (*done) (struct scsi_cmnd *))
1045 struct srp_cmd *srp_cmd;
1046 struct srp_event_struct *evt_struct;
1047 struct srp_indirect_buf *indirect;
1048 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
1049 u16 lun = lun_from_dev(cmnd->device);
1052 cmnd->result = (DID_OK << 16);
1053 evt_struct = get_event_struct(&hostdata->pool);
1055 return SCSI_MLQUEUE_HOST_BUSY;
1057 /* Set up the actual SRP IU */
1058 srp_cmd = &evt_struct->iu.srp.cmd;
1059 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
1060 srp_cmd->opcode = SRP_CMD;
1061 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
1062 int_to_scsilun(lun, &srp_cmd->lun);
1064 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
1065 if (!firmware_has_feature(FW_FEATURE_CMO))
1066 sdev_printk(KERN_ERR, cmnd->device,
1067 "couldn't convert cmd to srp_cmd\n");
1068 free_event_struct(&hostdata->pool, evt_struct);
1069 return SCSI_MLQUEUE_HOST_BUSY;
1072 init_event_struct(evt_struct,
1075 cmnd->request->timeout/HZ);
1077 evt_struct->cmnd = cmnd;
1078 evt_struct->cmnd_done = done;
1080 /* Fix up dma address of the buffer itself */
1081 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
1082 out_fmt = srp_cmd->buf_fmt >> 4;
1083 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
1084 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
1085 out_fmt == SRP_DATA_DESC_INDIRECT) &&
1086 indirect->table_desc.va == 0) {
1087 indirect->table_desc.va =
1088 cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) +
1089 offsetof(struct srp_cmd, add_data) +
1090 offsetof(struct srp_indirect_buf, desc_list));
1093 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
1096 static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
1098 /* ------------------------------------------------------------
1099 * Routines for driver initialization
1103 * map_persist_bufs: - Pre-map persistent data for adapter logins
1104 * @hostdata: ibmvscsi_host_data of host
1106 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
1107 * Return 1 on error, 0 on success.
1109 static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
1112 hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
1113 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1115 if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
1116 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
1120 hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
1121 &hostdata->madapter_info,
1122 sizeof(hostdata->madapter_info),
1124 if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
1125 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
1126 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1127 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1135 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
1136 * @hostdata: ibmvscsi_host_data of host
1138 * Unmap the capabilities and adapter info DMA buffers
1140 static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
1142 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1143 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1145 dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
1146 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
1150 * login_rsp: - Handle response to SRP login request
1151 * @evt_struct: srp_event_struct with the response
1153 * Used as a "done" callback by when sending srp_login. Gets called
1154 * by ibmvscsi_handle_crq()
1156 static void login_rsp(struct srp_event_struct *evt_struct)
1158 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1159 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
1160 case SRP_LOGIN_RSP: /* it worked! */
1162 case SRP_LOGIN_REJ: /* refused! */
1163 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
1164 evt_struct->xfer_iu->srp.login_rej.reason);
1166 ibmvscsi_set_request_limit(hostdata, -1);
1169 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
1170 evt_struct->xfer_iu->srp.login_rsp.opcode);
1172 ibmvscsi_set_request_limit(hostdata, -1);
1176 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
1177 hostdata->client_migrated = 0;
1179 /* Now we know what the real request-limit is.
1180 * This value is set rather than added to request_limit because
1181 * request_limit could have been set to -1 by this client.
1183 ibmvscsi_set_request_limit(hostdata,
1184 be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta));
1186 /* If we had any pending I/Os, kick them */
1187 hostdata->action = IBMVSCSI_HOST_ACTION_UNBLOCK;
1188 wake_up(&hostdata->work_wait_q);
1192 * send_srp_login: - Sends the srp login
1193 * @hostdata: ibmvscsi_host_data of host
1195 * Returns zero if successful.
1197 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
1200 unsigned long flags;
1201 struct srp_login_req *login;
1202 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
1204 BUG_ON(!evt_struct);
1205 init_event_struct(evt_struct, login_rsp,
1206 VIOSRP_SRP_FORMAT, login_timeout);
1208 login = &evt_struct->iu.srp.login_req;
1209 memset(login, 0, sizeof(*login));
1210 login->opcode = SRP_LOGIN_REQ;
1211 login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
1212 login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
1213 SRP_BUF_FORMAT_INDIRECT);
1215 /* Start out with a request limit of 0, since this is negotiated in
1216 * the login request we are just sending and login requests always
1217 * get sent by the driver regardless of request_limit.
1219 ibmvscsi_set_request_limit(hostdata, 0);
1221 spin_lock_irqsave(hostdata->host->host_lock, flags);
1222 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
1223 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1224 dev_info(hostdata->dev, "sent SRP login\n");
1229 * capabilities_rsp: - Handle response to MAD adapter capabilities request
1230 * @evt_struct: srp_event_struct with the response
1232 * Used as a "done" callback by when sending adapter_info.
1234 static void capabilities_rsp(struct srp_event_struct *evt_struct)
1236 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1238 if (evt_struct->xfer_iu->mad.capabilities.common.status) {
1239 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
1240 evt_struct->xfer_iu->mad.capabilities.common.status);
1242 if (hostdata->caps.migration.common.server_support !=
1243 cpu_to_be16(SERVER_SUPPORTS_CAP))
1244 dev_info(hostdata->dev, "Partition migration not supported\n");
1246 if (client_reserve) {
1247 if (hostdata->caps.reserve.common.server_support ==
1248 cpu_to_be16(SERVER_SUPPORTS_CAP))
1249 dev_info(hostdata->dev, "Client reserve enabled\n");
1251 dev_info(hostdata->dev, "Client reserve not supported\n");
1255 send_srp_login(hostdata);
1259 * send_mad_capabilities: - Sends the mad capabilities request
1260 * and stores the result so it can be retrieved with
1261 * @hostdata: ibmvscsi_host_data of host
1263 static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
1265 struct viosrp_capabilities *req;
1266 struct srp_event_struct *evt_struct;
1267 unsigned long flags;
1268 struct device_node *of_node = hostdata->dev->of_node;
1269 const char *location;
1271 evt_struct = get_event_struct(&hostdata->pool);
1272 BUG_ON(!evt_struct);
1274 init_event_struct(evt_struct, capabilities_rsp,
1275 VIOSRP_MAD_FORMAT, info_timeout);
1277 req = &evt_struct->iu.mad.capabilities;
1278 memset(req, 0, sizeof(*req));
1280 hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED);
1281 if (hostdata->client_migrated)
1282 hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);
1284 strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
1285 sizeof(hostdata->caps.name));
1287 location = of_get_property(of_node, "ibm,loc-code", NULL);
1288 location = location ? location : dev_name(hostdata->dev);
1289 strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
1291 req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);
1292 req->buffer = cpu_to_be64(hostdata->caps_addr);
1294 hostdata->caps.migration.common.cap_type =
1295 cpu_to_be32(MIGRATION_CAPABILITIES);
1296 hostdata->caps.migration.common.length =
1297 cpu_to_be16(sizeof(hostdata->caps.migration));
1298 hostdata->caps.migration.common.server_support =
1299 cpu_to_be16(SERVER_SUPPORTS_CAP);
1300 hostdata->caps.migration.ecl = cpu_to_be32(1);
1302 if (client_reserve) {
1303 hostdata->caps.reserve.common.cap_type =
1304 cpu_to_be32(RESERVATION_CAPABILITIES);
1305 hostdata->caps.reserve.common.length =
1306 cpu_to_be16(sizeof(hostdata->caps.reserve));
1307 hostdata->caps.reserve.common.server_support =
1308 cpu_to_be16(SERVER_SUPPORTS_CAP);
1309 hostdata->caps.reserve.type =
1310 cpu_to_be32(CLIENT_RESERVE_SCSI_2);
1311 req->common.length =
1312 cpu_to_be16(sizeof(hostdata->caps));
1314 req->common.length = cpu_to_be16(sizeof(hostdata->caps) -
1315 sizeof(hostdata->caps.reserve));
1317 spin_lock_irqsave(hostdata->host->host_lock, flags);
1318 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1319 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
1320 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1324 * fast_fail_rsp: - Handle response to MAD enable fast fail
1325 * @evt_struct: srp_event_struct with the response
1327 * Used as a "done" callback by when sending enable fast fail. Gets called
1328 * by ibmvscsi_handle_crq()
1330 static void fast_fail_rsp(struct srp_event_struct *evt_struct)
1332 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1333 u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status);
1335 if (status == VIOSRP_MAD_NOT_SUPPORTED)
1336 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1337 else if (status == VIOSRP_MAD_FAILED)
1338 dev_err(hostdata->dev, "fast_fail request failed\n");
1339 else if (status != VIOSRP_MAD_SUCCESS)
1340 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1342 send_mad_capabilities(hostdata);
1346 * enable_fast_fail() - Start host initialization
1347 * @hostdata: ibmvscsi_host_data of host
1349 * Returns zero if successful.
1351 static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1354 unsigned long flags;
1355 struct viosrp_fast_fail *fast_fail_mad;
1356 struct srp_event_struct *evt_struct;
1359 send_mad_capabilities(hostdata);
1363 evt_struct = get_event_struct(&hostdata->pool);
1364 BUG_ON(!evt_struct);
1366 init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1368 fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1369 memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1370 fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL);
1371 fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad));
1373 spin_lock_irqsave(hostdata->host->host_lock, flags);
1374 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1375 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1380 * adapter_info_rsp: - Handle response to MAD adapter info request
1381 * @evt_struct: srp_event_struct with the response
1383 * Used as a "done" callback by when sending adapter_info. Gets called
1384 * by ibmvscsi_handle_crq()
1386 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1388 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1390 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1391 dev_err(hostdata->dev, "error %d getting adapter info\n",
1392 evt_struct->xfer_iu->mad.adapter_info.common.status);
1394 dev_info(hostdata->dev, "host srp version: %s, "
1395 "host partition %s (%d), OS %d, max io %u\n",
1396 hostdata->madapter_info.srp_version,
1397 hostdata->madapter_info.partition_name,
1398 be32_to_cpu(hostdata->madapter_info.partition_number),
1399 be32_to_cpu(hostdata->madapter_info.os_type),
1400 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));
1402 if (hostdata->madapter_info.port_max_txu[0])
1403 hostdata->host->max_sectors =
1404 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9;
1406 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX &&
1407 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1408 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1409 hostdata->madapter_info.srp_version);
1410 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1412 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1415 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) {
1416 enable_fast_fail(hostdata);
1421 send_srp_login(hostdata);
1425 * send_mad_adapter_info: - Sends the mad adapter info request
1426 * and stores the result so it can be retrieved with
1427 * sysfs. We COULD consider causing a failure if the
1428 * returned SRP version doesn't match ours.
1429 * @hostdata: ibmvscsi_host_data of host
1431 * Returns zero if successful.
1433 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1435 struct viosrp_adapter_info *req;
1436 struct srp_event_struct *evt_struct;
1437 unsigned long flags;
1439 evt_struct = get_event_struct(&hostdata->pool);
1440 BUG_ON(!evt_struct);
1442 init_event_struct(evt_struct,
1447 req = &evt_struct->iu.mad.adapter_info;
1448 memset(req, 0x00, sizeof(*req));
1450 req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE);
1451 req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info));
1452 req->buffer = cpu_to_be64(hostdata->adapter_info_addr);
1454 spin_lock_irqsave(hostdata->host->host_lock, flags);
1455 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1456 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1457 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1461 * init_adapter() - Start virtual adapter initialization sequence
1463 static void init_adapter(struct ibmvscsi_host_data *hostdata)
1465 send_mad_adapter_info(hostdata);
1469 * sync_completion: Signal that a synchronous command has completed
1470 * Note that after returning from this call, the evt_struct is freed.
1471 * the caller waiting on this completion shouldn't touch the evt_struct
1474 static void sync_completion(struct srp_event_struct *evt_struct)
1476 /* copy the response back */
1477 if (evt_struct->sync_srp)
1478 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1480 complete(&evt_struct->comp);
1484 * ibmvscsi_eh_abort_handler: Abort a command...from scsi host template
1485 * send this over to the server and wait synchronously for the response
1487 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1489 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1490 struct srp_tsk_mgmt *tsk_mgmt;
1491 struct srp_event_struct *evt;
1492 struct srp_event_struct *tmp_evt, *found_evt;
1493 union viosrp_iu srp_rsp;
1495 unsigned long flags;
1496 u16 lun = lun_from_dev(cmd->device);
1497 unsigned long wait_switch = 0;
1499 /* First, find this command in our sent list so we can figure
1500 * out the correct tag
1502 spin_lock_irqsave(hostdata->host->host_lock, flags);
1503 wait_switch = jiffies + (init_timeout * HZ);
1506 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1507 if (tmp_evt->cmnd == cmd) {
1508 found_evt = tmp_evt;
1514 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1518 evt = get_event_struct(&hostdata->pool);
1520 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1521 sdev_printk(KERN_ERR, cmd->device,
1522 "failed to allocate abort event\n");
1526 init_event_struct(evt,
1531 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1533 /* Set up an abort SRP command */
1534 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1535 tsk_mgmt->opcode = SRP_TSK_MGMT;
1536 int_to_scsilun(lun, &tsk_mgmt->lun);
1537 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1538 tsk_mgmt->task_tag = (u64) found_evt;
1540 evt->sync_srp = &srp_rsp;
1542 init_completion(&evt->comp);
1543 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1545 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1548 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1550 spin_lock_irqsave(hostdata->host->host_lock, flags);
1551 } while (time_before(jiffies, wait_switch));
1553 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1556 sdev_printk(KERN_ERR, cmd->device,
1557 "failed to send abort() event. rc=%d\n", rsp_rc);
1561 sdev_printk(KERN_INFO, cmd->device,
1562 "aborting command. lun 0x%llx, tag 0x%llx\n",
1563 (((u64) lun) << 48), (u64) found_evt);
1565 wait_for_completion(&evt->comp);
1567 /* make sure we got a good response */
1568 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1569 if (printk_ratelimit())
1570 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1571 srp_rsp.srp.rsp.opcode);
1575 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1576 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1578 rsp_rc = srp_rsp.srp.rsp.status;
1581 if (printk_ratelimit())
1582 sdev_printk(KERN_WARNING, cmd->device,
1583 "abort code %d for task tag 0x%llx\n",
1584 rsp_rc, tsk_mgmt->task_tag);
1588 /* Because we dropped the spinlock above, it's possible
1589 * The event is no longer in our list. Make sure it didn't
1590 * complete while we were aborting
1592 spin_lock_irqsave(hostdata->host->host_lock, flags);
1594 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1595 if (tmp_evt->cmnd == cmd) {
1596 found_evt = tmp_evt;
1601 if (found_evt == NULL) {
1602 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1603 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1604 tsk_mgmt->task_tag);
1608 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1609 tsk_mgmt->task_tag);
1611 cmd->result = (DID_ABORT << 16);
1612 list_del(&found_evt->list);
1613 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1614 found_evt->hostdata->dev);
1615 free_event_struct(&found_evt->hostdata->pool, found_evt);
1616 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1617 atomic_inc(&hostdata->request_limit);
1622 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1623 * template send this over to the server and wait synchronously for the
1626 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1628 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1629 struct srp_tsk_mgmt *tsk_mgmt;
1630 struct srp_event_struct *evt;
1631 struct srp_event_struct *tmp_evt, *pos;
1632 union viosrp_iu srp_rsp;
1634 unsigned long flags;
1635 u16 lun = lun_from_dev(cmd->device);
1636 unsigned long wait_switch = 0;
1638 spin_lock_irqsave(hostdata->host->host_lock, flags);
1639 wait_switch = jiffies + (init_timeout * HZ);
1641 evt = get_event_struct(&hostdata->pool);
1643 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1644 sdev_printk(KERN_ERR, cmd->device,
1645 "failed to allocate reset event\n");
1649 init_event_struct(evt,
1654 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1656 /* Set up a lun reset SRP command */
1657 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1658 tsk_mgmt->opcode = SRP_TSK_MGMT;
1659 int_to_scsilun(lun, &tsk_mgmt->lun);
1660 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1662 evt->sync_srp = &srp_rsp;
1664 init_completion(&evt->comp);
1665 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1667 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1670 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1672 spin_lock_irqsave(hostdata->host->host_lock, flags);
1673 } while (time_before(jiffies, wait_switch));
1675 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1678 sdev_printk(KERN_ERR, cmd->device,
1679 "failed to send reset event. rc=%d\n", rsp_rc);
1683 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1684 (((u64) lun) << 48));
1686 wait_for_completion(&evt->comp);
1688 /* make sure we got a good response */
1689 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1690 if (printk_ratelimit())
1691 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1692 srp_rsp.srp.rsp.opcode);
1696 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1697 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1699 rsp_rc = srp_rsp.srp.rsp.status;
1702 if (printk_ratelimit())
1703 sdev_printk(KERN_WARNING, cmd->device,
1704 "reset code %d for task tag 0x%llx\n",
1705 rsp_rc, tsk_mgmt->task_tag);
1709 /* We need to find all commands for this LUN that have not yet been
1710 * responded to, and fail them with DID_RESET
1712 spin_lock_irqsave(hostdata->host->host_lock, flags);
1713 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1714 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1716 tmp_evt->cmnd->result = (DID_RESET << 16);
1717 list_del(&tmp_evt->list);
1718 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1719 tmp_evt->hostdata->dev);
1720 free_event_struct(&tmp_evt->hostdata->pool,
1722 atomic_inc(&hostdata->request_limit);
1723 if (tmp_evt->cmnd_done)
1724 tmp_evt->cmnd_done(tmp_evt->cmnd);
1725 else if (tmp_evt->done)
1726 tmp_evt->done(tmp_evt);
1729 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1734 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1735 * @cmd: struct scsi_cmnd having problems
1737 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1739 unsigned long wait_switch = 0;
1740 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1742 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1744 ibmvscsi_reset_host(hostdata);
1746 for (wait_switch = jiffies + (init_timeout * HZ);
1747 time_before(jiffies, wait_switch) &&
1748 atomic_read(&hostdata->request_limit) < 2;) {
1753 if (atomic_read(&hostdata->request_limit) <= 0)
1760 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1761 * @crq: Command/Response queue
1762 * @hostdata: ibmvscsi_host_data of host
1765 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1766 struct ibmvscsi_host_data *hostdata)
1769 unsigned long flags;
1770 /* The hypervisor copies our tag value here so no byteswapping */
1771 struct srp_event_struct *evt_struct =
1772 (__force struct srp_event_struct *)crq->IU_data_ptr;
1773 switch (crq->valid) {
1774 case VIOSRP_CRQ_INIT_RSP: /* initialization */
1775 switch (crq->format) {
1776 case VIOSRP_CRQ_INIT: /* Initialization message */
1777 dev_info(hostdata->dev, "partner initialized\n");
1778 /* Send back a response */
1779 rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
1782 init_adapter(hostdata);
1784 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1788 case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */
1789 dev_info(hostdata->dev, "partner initialization complete\n");
1792 init_adapter(hostdata);
1795 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1798 case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */
1799 scsi_block_requests(hostdata->host);
1800 ibmvscsi_set_request_limit(hostdata, 0);
1801 if (crq->format == 0x06) {
1802 /* We need to re-setup the interpartition connection */
1803 dev_info(hostdata->dev, "Re-enabling adapter!\n");
1804 hostdata->client_migrated = 1;
1805 hostdata->action = IBMVSCSI_HOST_ACTION_REENABLE;
1806 purge_requests(hostdata, DID_REQUEUE);
1807 wake_up(&hostdata->work_wait_q);
1809 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1811 ibmvscsi_reset_host(hostdata);
1814 case VIOSRP_CRQ_CMD_RSP: /* real payload */
1817 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1822 /* The only kind of payload CRQs we should get are responses to
1823 * things we send. Make sure this response is to something we
1826 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1827 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1832 if (atomic_read(&evt_struct->free)) {
1833 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1838 if (crq->format == VIOSRP_SRP_FORMAT)
1839 atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta),
1840 &hostdata->request_limit);
1842 del_timer(&evt_struct->timer);
1844 if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1845 evt_struct->cmnd->result = DID_ERROR << 16;
1846 if (evt_struct->done)
1847 evt_struct->done(evt_struct);
1849 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1852 * Lock the host_lock before messing with these structures, since we
1853 * are running in a task context
1855 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1856 list_del(&evt_struct->list);
1857 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1858 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1862 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1863 * @sdev: struct scsi_device device to configure
1865 * Enable allow_restart for a device if it is a disk. Adjust the
1866 * queue_depth here also as is required by the documentation for
1867 * struct scsi_host_template.
1869 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1871 struct Scsi_Host *shost = sdev->host;
1872 unsigned long lock_flags = 0;
1874 spin_lock_irqsave(shost->host_lock, lock_flags);
1875 if (sdev->type == TYPE_DISK) {
1876 sdev->allow_restart = 1;
1877 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1879 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1884 * ibmvscsi_change_queue_depth - Change the device's queue depth
1885 * @sdev: scsi device struct
1886 * @qdepth: depth to set
1891 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1893 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1894 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1895 return scsi_change_queue_depth(sdev, qdepth);
1898 /* ------------------------------------------------------------
1901 static ssize_t show_host_vhost_loc(struct device *dev,
1902 struct device_attribute *attr, char *buf)
1904 struct Scsi_Host *shost = class_to_shost(dev);
1905 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1908 len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1909 hostdata->caps.loc);
1913 static struct device_attribute ibmvscsi_host_vhost_loc = {
1915 .name = "vhost_loc",
1918 .show = show_host_vhost_loc,
1921 static ssize_t show_host_vhost_name(struct device *dev,
1922 struct device_attribute *attr, char *buf)
1924 struct Scsi_Host *shost = class_to_shost(dev);
1925 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1928 len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1929 hostdata->caps.name);
1933 static struct device_attribute ibmvscsi_host_vhost_name = {
1935 .name = "vhost_name",
1938 .show = show_host_vhost_name,
1941 static ssize_t show_host_srp_version(struct device *dev,
1942 struct device_attribute *attr, char *buf)
1944 struct Scsi_Host *shost = class_to_shost(dev);
1945 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1948 len = snprintf(buf, PAGE_SIZE, "%s\n",
1949 hostdata->madapter_info.srp_version);
1953 static struct device_attribute ibmvscsi_host_srp_version = {
1955 .name = "srp_version",
1958 .show = show_host_srp_version,
1961 static ssize_t show_host_partition_name(struct device *dev,
1962 struct device_attribute *attr,
1965 struct Scsi_Host *shost = class_to_shost(dev);
1966 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1969 len = snprintf(buf, PAGE_SIZE, "%s\n",
1970 hostdata->madapter_info.partition_name);
1974 static struct device_attribute ibmvscsi_host_partition_name = {
1976 .name = "partition_name",
1979 .show = show_host_partition_name,
1982 static ssize_t show_host_partition_number(struct device *dev,
1983 struct device_attribute *attr,
1986 struct Scsi_Host *shost = class_to_shost(dev);
1987 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1990 len = snprintf(buf, PAGE_SIZE, "%d\n",
1991 be32_to_cpu(hostdata->madapter_info.partition_number));
1995 static struct device_attribute ibmvscsi_host_partition_number = {
1997 .name = "partition_number",
2000 .show = show_host_partition_number,
2003 static ssize_t show_host_mad_version(struct device *dev,
2004 struct device_attribute *attr, char *buf)
2006 struct Scsi_Host *shost = class_to_shost(dev);
2007 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2010 len = snprintf(buf, PAGE_SIZE, "%d\n",
2011 be32_to_cpu(hostdata->madapter_info.mad_version));
2015 static struct device_attribute ibmvscsi_host_mad_version = {
2017 .name = "mad_version",
2020 .show = show_host_mad_version,
2023 static ssize_t show_host_os_type(struct device *dev,
2024 struct device_attribute *attr, char *buf)
2026 struct Scsi_Host *shost = class_to_shost(dev);
2027 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2030 len = snprintf(buf, PAGE_SIZE, "%d\n",
2031 be32_to_cpu(hostdata->madapter_info.os_type));
2035 static struct device_attribute ibmvscsi_host_os_type = {
2040 .show = show_host_os_type,
2043 static ssize_t show_host_config(struct device *dev,
2044 struct device_attribute *attr, char *buf)
2049 static struct device_attribute ibmvscsi_host_config = {
2054 .show = show_host_config,
2057 static int ibmvscsi_host_reset(struct Scsi_Host *shost, int reset_type)
2059 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2061 dev_info(hostdata->dev, "Initiating adapter reset!\n");
2062 ibmvscsi_reset_host(hostdata);
2067 static struct device_attribute *ibmvscsi_attrs[] = {
2068 &ibmvscsi_host_vhost_loc,
2069 &ibmvscsi_host_vhost_name,
2070 &ibmvscsi_host_srp_version,
2071 &ibmvscsi_host_partition_name,
2072 &ibmvscsi_host_partition_number,
2073 &ibmvscsi_host_mad_version,
2074 &ibmvscsi_host_os_type,
2075 &ibmvscsi_host_config,
2079 /* ------------------------------------------------------------
2080 * SCSI driver registration
2082 static struct scsi_host_template driver_template = {
2083 .module = THIS_MODULE,
2084 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
2085 .proc_name = "ibmvscsi",
2086 .queuecommand = ibmvscsi_queuecommand,
2087 .eh_timed_out = srp_timed_out,
2088 .eh_abort_handler = ibmvscsi_eh_abort_handler,
2089 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
2090 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
2091 .slave_configure = ibmvscsi_slave_configure,
2092 .change_queue_depth = ibmvscsi_change_queue_depth,
2093 .host_reset = ibmvscsi_host_reset,
2094 .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
2095 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
2097 .sg_tablesize = SG_ALL,
2098 .shost_attrs = ibmvscsi_attrs,
2102 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
2104 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
2107 * Number of bytes of IO data the driver will need to perform well.
2109 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
2111 /* iu_storage data allocated in initialize_event_pool */
2112 unsigned long desired_io = max_events * sizeof(union viosrp_iu);
2114 /* add io space for sg data */
2115 desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
2116 IBMVSCSI_CMDS_PER_LUN_DEFAULT);
2121 static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
2123 unsigned long flags;
2125 char *action = "reset";
2127 spin_lock_irqsave(hostdata->host->host_lock, flags);
2128 switch (hostdata->action) {
2129 case IBMVSCSI_HOST_ACTION_UNBLOCK:
2132 case IBMVSCSI_HOST_ACTION_RESET:
2133 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2134 rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
2135 spin_lock_irqsave(hostdata->host->host_lock, flags);
2137 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2138 vio_enable_interrupts(to_vio_dev(hostdata->dev));
2140 case IBMVSCSI_HOST_ACTION_REENABLE:
2142 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2143 rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
2144 spin_lock_irqsave(hostdata->host->host_lock, flags);
2146 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2148 case IBMVSCSI_HOST_ACTION_NONE:
2150 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2154 hostdata->action = IBMVSCSI_HOST_ACTION_NONE;
2155 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2158 ibmvscsi_set_request_limit(hostdata, -1);
2159 dev_err(hostdata->dev, "error after %s\n", action);
2162 scsi_unblock_requests(hostdata->host);
2165 static int __ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2167 if (kthread_should_stop())
2169 switch (hostdata->action) {
2170 case IBMVSCSI_HOST_ACTION_NONE:
2172 case IBMVSCSI_HOST_ACTION_RESET:
2173 case IBMVSCSI_HOST_ACTION_REENABLE:
2174 case IBMVSCSI_HOST_ACTION_UNBLOCK:
2182 static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2184 unsigned long flags;
2187 spin_lock_irqsave(hostdata->host->host_lock, flags);
2188 rc = __ibmvscsi_work_to_do(hostdata);
2189 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2194 static int ibmvscsi_work(void *data)
2196 struct ibmvscsi_host_data *hostdata = data;
2199 set_user_nice(current, MIN_NICE);
2202 rc = wait_event_interruptible(hostdata->work_wait_q,
2203 ibmvscsi_work_to_do(hostdata));
2207 if (kthread_should_stop())
2210 ibmvscsi_do_work(hostdata);
2217 * Called by bus code for each adapter
2219 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2221 struct ibmvscsi_host_data *hostdata;
2222 struct Scsi_Host *host;
2223 struct device *dev = &vdev->dev;
2224 struct srp_rport_identifiers ids;
2225 struct srp_rport *rport;
2226 unsigned long wait_switch = 0;
2229 dev_set_drvdata(&vdev->dev, NULL);
2231 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
2233 dev_err(&vdev->dev, "couldn't allocate host data\n");
2234 goto scsi_host_alloc_failed;
2237 host->transportt = ibmvscsi_transport_template;
2238 hostdata = shost_priv(host);
2239 memset(hostdata, 0x00, sizeof(*hostdata));
2240 INIT_LIST_HEAD(&hostdata->sent);
2241 init_waitqueue_head(&hostdata->work_wait_q);
2242 hostdata->host = host;
2243 hostdata->dev = dev;
2244 ibmvscsi_set_request_limit(hostdata, -1);
2245 hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
2247 if (map_persist_bufs(hostdata)) {
2248 dev_err(&vdev->dev, "couldn't map persistent buffers\n");
2249 goto persist_bufs_failed;
2252 hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
2253 "ibmvscsi", host->host_no);
2255 if (IS_ERR(hostdata->work_thread)) {
2256 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
2257 PTR_ERR(hostdata->work_thread));
2258 goto init_crq_failed;
2261 rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
2262 if (rc != 0 && rc != H_RESOURCE) {
2263 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
2266 if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
2267 dev_err(&vdev->dev, "couldn't initialize event pool\n");
2268 goto init_pool_failed;
2271 host->max_lun = IBMVSCSI_MAX_LUN;
2272 host->max_id = max_id;
2273 host->max_channel = max_channel;
2274 host->max_cmd_len = 16;
2277 "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n",
2278 host->max_id, host->max_lun, host->max_channel);
2280 if (scsi_add_host(hostdata->host, hostdata->dev))
2281 goto add_host_failed;
2283 /* we don't have a proper target_port_id so let's use the fake one */
2284 memcpy(ids.port_id, hostdata->madapter_info.partition_name,
2285 sizeof(ids.port_id));
2286 ids.roles = SRP_RPORT_ROLE_TARGET;
2287 rport = srp_rport_add(host, &ids);
2289 goto add_srp_port_failed;
2291 /* Try to send an initialization message. Note that this is allowed
2292 * to fail if the other end is not acive. In that case we don't
2295 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
2296 || rc == H_RESOURCE) {
2298 * Wait around max init_timeout secs for the adapter to finish
2299 * initializing. When we are done initializing, we will have a
2300 * valid request_limit. We don't want Linux scanning before
2303 for (wait_switch = jiffies + (init_timeout * HZ);
2304 time_before(jiffies, wait_switch) &&
2305 atomic_read(&hostdata->request_limit) < 2;) {
2310 /* if we now have a valid request_limit, initiate a scan */
2311 if (atomic_read(&hostdata->request_limit) > 0)
2312 scsi_scan_host(host);
2315 dev_set_drvdata(&vdev->dev, hostdata);
2316 spin_lock(&ibmvscsi_driver_lock);
2317 list_add_tail(&hostdata->host_list, &ibmvscsi_head);
2318 spin_unlock(&ibmvscsi_driver_lock);
2321 add_srp_port_failed:
2322 scsi_remove_host(hostdata->host);
2324 release_event_pool(&hostdata->pool, hostdata);
2326 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
2328 kthread_stop(hostdata->work_thread);
2330 unmap_persist_bufs(hostdata);
2331 persist_bufs_failed:
2332 scsi_host_put(host);
2333 scsi_host_alloc_failed:
2337 static void ibmvscsi_remove(struct vio_dev *vdev)
2339 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2341 srp_remove_host(hostdata->host);
2342 scsi_remove_host(hostdata->host);
2344 purge_requests(hostdata, DID_ERROR);
2345 release_event_pool(&hostdata->pool, hostdata);
2347 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
2350 kthread_stop(hostdata->work_thread);
2351 unmap_persist_bufs(hostdata);
2353 spin_lock(&ibmvscsi_driver_lock);
2354 list_del(&hostdata->host_list);
2355 spin_unlock(&ibmvscsi_driver_lock);
2357 scsi_host_put(hostdata->host);
2361 * ibmvscsi_resume: Resume from suspend
2362 * @dev: device struct
2364 * We may have lost an interrupt across suspend/resume, so kick the
2367 static int ibmvscsi_resume(struct device *dev)
2369 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2370 vio_disable_interrupts(to_vio_dev(hostdata->dev));
2371 tasklet_schedule(&hostdata->srp_task);
2377 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
2380 static const struct vio_device_id ibmvscsi_device_table[] = {
2381 {"vscsi", "IBM,v-scsi"},
2384 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2386 static const struct dev_pm_ops ibmvscsi_pm_ops = {
2387 .resume = ibmvscsi_resume
2390 static struct vio_driver ibmvscsi_driver = {
2391 .id_table = ibmvscsi_device_table,
2392 .probe = ibmvscsi_probe,
2393 .remove = ibmvscsi_remove,
2394 .get_desired_dma = ibmvscsi_get_desired_dma,
2396 .pm = &ibmvscsi_pm_ops,
2399 static struct srp_function_template ibmvscsi_transport_functions = {
2402 static int __init ibmvscsi_module_init(void)
2406 /* Ensure we have two requests to do error recovery */
2407 driver_template.can_queue = max_requests;
2408 max_events = max_requests + 2;
2410 if (!firmware_has_feature(FW_FEATURE_VIO))
2413 ibmvscsi_transport_template =
2414 srp_attach_transport(&ibmvscsi_transport_functions);
2415 if (!ibmvscsi_transport_template)
2418 ret = vio_register_driver(&ibmvscsi_driver);
2420 srp_release_transport(ibmvscsi_transport_template);
2424 static void __exit ibmvscsi_module_exit(void)
2426 vio_unregister_driver(&ibmvscsi_driver);
2427 srp_release_transport(ibmvscsi_transport_template);
2430 module_init(ibmvscsi_module_init);
2431 module_exit(ibmvscsi_module_exit);