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 * release_crq_queue: - Deallocates data and unregisters CRQ
134 * @queue: crq_queue to initialize and register
135 * @host_data: ibmvscsi_host_data of host
137 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
138 * the crq with the hypervisor.
140 static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
141 struct ibmvscsi_host_data *hostdata,
145 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
146 free_irq(vdev->irq, (void *)hostdata);
147 tasklet_kill(&hostdata->srp_task);
151 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
152 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
153 dma_unmap_single(hostdata->dev,
155 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
156 free_page((unsigned long)queue->msgs);
160 * crq_queue_next_crq: - Returns the next entry in message queue
161 * @queue: crq_queue to use
163 * Returns pointer to next entry in queue, or NULL if there are no new
164 * entried in the CRQ.
166 static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
168 struct viosrp_crq *crq;
171 spin_lock_irqsave(&queue->lock, flags);
172 crq = &queue->msgs[queue->cur];
173 if (crq->valid != VIOSRP_CRQ_FREE) {
174 if (++queue->cur == queue->size)
177 /* Ensure the read of the valid bit occurs before reading any
178 * other bits of the CRQ entry
183 spin_unlock_irqrestore(&queue->lock, flags);
189 * ibmvscsi_send_crq: - Send a CRQ
190 * @hostdata: the adapter
191 * @word1: the first 64 bits of the data
192 * @word2: the second 64 bits of the data
194 static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
195 u64 word1, u64 word2)
197 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
200 * Ensure the command buffer is flushed to memory before handing it
201 * over to the VIOS to prevent it from fetching any stale data.
204 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
208 * ibmvscsi_task: - Process srps asynchronously
209 * @data: ibmvscsi_host_data of host
211 static void ibmvscsi_task(void *data)
213 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
214 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
215 struct viosrp_crq *crq;
219 /* Pull all the valid messages off the CRQ */
220 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
221 ibmvscsi_handle_crq(crq, hostdata);
222 crq->valid = VIOSRP_CRQ_FREE;
226 vio_enable_interrupts(vdev);
227 crq = crq_queue_next_crq(&hostdata->queue);
229 vio_disable_interrupts(vdev);
230 ibmvscsi_handle_crq(crq, hostdata);
231 crq->valid = VIOSRP_CRQ_FREE;
239 static void gather_partition_info(void)
241 const char *ppartition_name;
242 const __be32 *p_number_ptr;
244 /* Retrieve information about this partition */
248 of_node_get(of_root);
250 ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);
252 strlcpy(partition_name, ppartition_name,
253 sizeof(partition_name));
254 p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);
256 partition_number = of_read_number(p_number_ptr, 1);
257 of_node_put(of_root);
260 static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
262 memset(&hostdata->madapter_info, 0x00,
263 sizeof(hostdata->madapter_info));
265 dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
266 strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
268 strncpy(hostdata->madapter_info.partition_name, partition_name,
269 sizeof(hostdata->madapter_info.partition_name));
271 hostdata->madapter_info.partition_number =
272 cpu_to_be32(partition_number);
274 hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1);
275 hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX);
279 * reset_crq_queue: - resets a crq after a failure
280 * @queue: crq_queue to initialize and register
281 * @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 * initialize_crq_queue: - Initializes and registers CRQ with hypervisor
318 * @queue: crq_queue to initialize and register
319 * @hostdata: ibmvscsi_host_data of host
321 * Allocates a page for messages, maps it for dma, and registers
322 * the crq with the hypervisor.
323 * Returns zero on success.
325 static int ibmvscsi_init_crq_queue(struct crq_queue *queue,
326 struct ibmvscsi_host_data *hostdata,
331 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
333 queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
337 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
339 queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
340 queue->size * sizeof(*queue->msgs),
343 if (dma_mapping_error(hostdata->dev, queue->msg_token))
346 gather_partition_info();
347 set_adapter_info(hostdata);
349 retrc = rc = plpar_hcall_norets(H_REG_CRQ,
351 queue->msg_token, PAGE_SIZE);
352 if (rc == H_RESOURCE)
353 /* maybe kexecing and resource is busy. try a reset */
354 rc = ibmvscsi_reset_crq_queue(queue,
357 if (rc == H_CLOSED) {
358 /* Adapter is good, but other end is not ready */
359 dev_warn(hostdata->dev, "Partner adapter not ready\n");
361 } else if (rc != 0) {
362 dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
367 spin_lock_init(&queue->lock);
369 tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
370 (unsigned long)hostdata);
372 if (request_irq(vdev->irq,
373 ibmvscsi_handle_event,
374 0, "ibmvscsi", (void *)hostdata) != 0) {
375 dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
380 rc = vio_enable_interrupts(vdev);
382 dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
389 tasklet_kill(&hostdata->srp_task);
394 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
395 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
397 dma_unmap_single(hostdata->dev,
399 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
401 free_page((unsigned long)queue->msgs);
407 * reenable_crq_queue: - reenables a crq after
408 * @queue: crq_queue to initialize and register
409 * @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 /* Re-enable the CRQ */
422 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
423 } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
426 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
430 /* ------------------------------------------------------------
431 * Routines for the event pool and event structs
434 * initialize_event_pool: - Allocates and initializes the event pool for a host
435 * @pool: event_pool to be initialized
436 * @size: Number of events in pool
437 * @hostdata: ibmvscsi_host_data who owns the event pool
439 * Returns zero on success.
441 static int initialize_event_pool(struct event_pool *pool,
442 int size, struct ibmvscsi_host_data *hostdata)
448 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
453 dma_alloc_coherent(hostdata->dev,
454 pool->size * sizeof(*pool->iu_storage),
456 if (!pool->iu_storage) {
461 for (i = 0; i < pool->size; ++i) {
462 struct srp_event_struct *evt = &pool->events[i];
463 memset(&evt->crq, 0x00, sizeof(evt->crq));
464 atomic_set(&evt->free, 1);
465 evt->crq.valid = VIOSRP_CRQ_CMD_RSP;
466 evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));
467 evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +
468 sizeof(*evt->xfer_iu) * i);
469 evt->xfer_iu = pool->iu_storage + i;
470 evt->hostdata = hostdata;
471 evt->ext_list = NULL;
472 evt->ext_list_token = 0;
479 * release_event_pool: - Frees memory of an event pool of a host
480 * @pool: event_pool to be released
481 * @hostdata: ibmvscsi_host_data who owns the even pool
483 * Returns zero on success.
485 static void release_event_pool(struct event_pool *pool,
486 struct ibmvscsi_host_data *hostdata)
489 for (i = 0; i < pool->size; ++i) {
490 if (atomic_read(&pool->events[i].free) != 1)
492 if (pool->events[i].ext_list) {
493 dma_free_coherent(hostdata->dev,
494 SG_ALL * sizeof(struct srp_direct_buf),
495 pool->events[i].ext_list,
496 pool->events[i].ext_list_token);
500 dev_warn(hostdata->dev, "releasing event pool with %d "
501 "events still in use?\n", in_use);
503 dma_free_coherent(hostdata->dev,
504 pool->size * sizeof(*pool->iu_storage),
505 pool->iu_storage, pool->iu_token);
509 * valid_event_struct: - Determines if event is valid.
510 * @pool: event_pool that contains the event
511 * @evt: srp_event_struct to be checked for validity
513 * Returns zero if event is invalid, one otherwise.
515 static int valid_event_struct(struct event_pool *pool,
516 struct srp_event_struct *evt)
518 int index = evt - pool->events;
519 if (index < 0 || index >= pool->size) /* outside of bounds */
521 if (evt != pool->events + index) /* unaligned */
527 * ibmvscsi_free-event_struct: - Changes status of event to "free"
528 * @pool: event_pool that contains the event
529 * @evt: srp_event_struct to be modified
532 static void free_event_struct(struct event_pool *pool,
533 struct srp_event_struct *evt)
535 if (!valid_event_struct(pool, evt)) {
536 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
537 "(not in pool %p)\n", evt, pool->events);
540 if (atomic_inc_return(&evt->free) != 1) {
541 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
542 "which is not in use!\n", evt);
548 * get_evt_struct: - Gets the next free event in pool
549 * @pool: event_pool that contains the events to be searched
551 * Returns the next event in "free" state, and NULL if none are free.
552 * Note that no synchronization is done here, we assume the host_lock
553 * will syncrhonze things.
555 static struct srp_event_struct *get_event_struct(struct event_pool *pool)
558 int poolsize = pool->size;
559 int offset = pool->next;
561 for (i = 0; i < poolsize; i++) {
562 offset = (offset + 1) % poolsize;
563 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
565 return &pool->events[offset];
569 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
574 * init_event_struct: Initialize fields in an event struct that are always
577 * @done: Routine to call when the event is responded to
578 * @format: SRP or MAD format
579 * @timeout: timeout value set in the CRQ
581 static void init_event_struct(struct srp_event_struct *evt_struct,
582 void (*done) (struct srp_event_struct *),
586 evt_struct->cmnd = NULL;
587 evt_struct->cmnd_done = NULL;
588 evt_struct->sync_srp = NULL;
589 evt_struct->crq.format = format;
590 evt_struct->crq.timeout = cpu_to_be16(timeout);
591 evt_struct->done = done;
594 /* ------------------------------------------------------------
595 * Routines for receiving SCSI responses from the hosting partition
599 * set_srp_direction: Set the fields in the srp related to data
600 * direction and number of buffers based on the direction in
601 * the scsi_cmnd and the number of buffers
603 static void set_srp_direction(struct scsi_cmnd *cmd,
604 struct srp_cmd *srp_cmd,
613 fmt = SRP_DATA_DESC_DIRECT;
615 fmt = SRP_DATA_DESC_INDIRECT;
616 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
618 if (cmd->sc_data_direction == DMA_TO_DEVICE)
619 srp_cmd->data_out_desc_cnt = numbuf;
621 srp_cmd->data_in_desc_cnt = numbuf;
624 if (cmd->sc_data_direction == DMA_TO_DEVICE)
625 srp_cmd->buf_fmt = fmt << 4;
627 srp_cmd->buf_fmt = fmt;
631 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
632 * @cmd: srp_cmd whose additional_data member will be unmapped
633 * @dev: device for which the memory is mapped
636 static void unmap_cmd_data(struct srp_cmd *cmd,
637 struct srp_event_struct *evt_struct,
642 out_fmt = cmd->buf_fmt >> 4;
643 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
645 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
648 if (evt_struct->cmnd)
649 scsi_dma_unmap(evt_struct->cmnd);
652 static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
653 struct srp_direct_buf *md)
656 struct scatterlist *sg;
657 u64 total_length = 0;
659 scsi_for_each_sg(cmd, sg, nseg, i) {
660 struct srp_direct_buf *descr = md + i;
661 descr->va = cpu_to_be64(sg_dma_address(sg));
662 descr->len = cpu_to_be32(sg_dma_len(sg));
664 total_length += sg_dma_len(sg);
670 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
671 * @cmd: struct scsi_cmnd with the scatterlist
672 * @srp_cmd: srp_cmd that contains the memory descriptor
673 * @dev: device for which to map dma memory
675 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
676 * Returns 1 on success.
678 static int map_sg_data(struct scsi_cmnd *cmd,
679 struct srp_event_struct *evt_struct,
680 struct srp_cmd *srp_cmd, struct device *dev)
684 u64 total_length = 0;
685 struct srp_direct_buf *data =
686 (struct srp_direct_buf *) srp_cmd->add_data;
687 struct srp_indirect_buf *indirect =
688 (struct srp_indirect_buf *) data;
690 sg_mapped = scsi_dma_map(cmd);
693 else if (sg_mapped < 0)
696 set_srp_direction(cmd, srp_cmd, sg_mapped);
698 /* special case; we can use a single direct descriptor */
699 if (sg_mapped == 1) {
700 map_sg_list(cmd, sg_mapped, data);
704 indirect->table_desc.va = 0;
705 indirect->table_desc.len = cpu_to_be32(sg_mapped *
706 sizeof(struct srp_direct_buf));
707 indirect->table_desc.key = 0;
709 if (sg_mapped <= MAX_INDIRECT_BUFS) {
710 total_length = map_sg_list(cmd, sg_mapped,
711 &indirect->desc_list[0]);
712 indirect->len = cpu_to_be32(total_length);
716 /* get indirect table */
717 if (!evt_struct->ext_list) {
718 evt_struct->ext_list = (struct srp_direct_buf *)
719 dma_alloc_coherent(dev,
720 SG_ALL * sizeof(struct srp_direct_buf),
721 &evt_struct->ext_list_token, 0);
722 if (!evt_struct->ext_list) {
723 if (!firmware_has_feature(FW_FEATURE_CMO))
724 sdev_printk(KERN_ERR, cmd->device,
725 "Can't allocate memory "
726 "for indirect table\n");
732 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
734 indirect->len = cpu_to_be32(total_length);
735 indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token);
736 indirect->table_desc.len = cpu_to_be32(sg_mapped *
737 sizeof(indirect->desc_list[0]));
738 memcpy(indirect->desc_list, evt_struct->ext_list,
739 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
744 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
745 * @cmd: struct scsi_cmnd with the memory to be mapped
746 * @srp_cmd: srp_cmd that contains the memory descriptor
747 * @dev: dma device for which to map dma memory
749 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
750 * Returns 1 on success.
752 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
753 struct srp_event_struct *evt_struct,
754 struct srp_cmd *srp_cmd, struct device *dev)
756 switch (cmd->sc_data_direction) {
757 case DMA_FROM_DEVICE:
762 case DMA_BIDIRECTIONAL:
763 sdev_printk(KERN_ERR, cmd->device,
764 "Can't map DMA_BIDIRECTIONAL to read/write\n");
767 sdev_printk(KERN_ERR, cmd->device,
768 "Unknown data direction 0x%02x; can't map!\n",
769 cmd->sc_data_direction);
773 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
777 * purge_requests: Our virtual adapter just shut down. purge any sent requests
778 * @hostdata: the adapter
780 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
782 struct srp_event_struct *evt;
785 spin_lock_irqsave(hostdata->host->host_lock, flags);
786 while (!list_empty(&hostdata->sent)) {
787 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
788 list_del(&evt->list);
789 del_timer(&evt->timer);
791 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
793 evt->cmnd->result = (error_code << 16);
794 unmap_cmd_data(&evt->iu.srp.cmd, evt,
797 evt->cmnd_done(evt->cmnd);
798 } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&
799 evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
801 free_event_struct(&evt->hostdata->pool, evt);
802 spin_lock_irqsave(hostdata->host->host_lock, flags);
804 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
808 * ibmvscsi_reset_host - Reset the connection to the server
809 * @hostdata: struct ibmvscsi_host_data to reset
811 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
813 scsi_block_requests(hostdata->host);
814 atomic_set(&hostdata->request_limit, 0);
816 purge_requests(hostdata, DID_ERROR);
817 hostdata->reset_crq = 1;
818 wake_up(&hostdata->work_wait_q);
822 * ibmvscsi_timeout - Internal command timeout handler
823 * @evt_struct: struct srp_event_struct that timed out
825 * Called when an internally generated command times out
827 static void ibmvscsi_timeout(struct timer_list *t)
829 struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer);
830 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
832 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
833 evt_struct->iu.srp.cmd.opcode);
835 ibmvscsi_reset_host(hostdata);
839 /* ------------------------------------------------------------
840 * Routines for sending and receiving SRPs
843 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
844 * @evt_struct: evt_struct to be sent
845 * @hostdata: ibmvscsi_host_data of host
846 * @timeout: timeout in seconds - 0 means do not time command
848 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
849 * Note that this routine assumes that host_lock is held for synchronization
851 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
852 struct ibmvscsi_host_data *hostdata,
853 unsigned long timeout)
855 __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq;
856 int request_status = 0;
860 /* If we have exhausted our request limit, just fail this request,
861 * unless it is for a reset or abort.
862 * Note that there are rare cases involving driver generated requests
863 * (such as task management requests) that the mid layer may think we
864 * can handle more requests (can_queue) when we actually can't
866 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
869 atomic_dec_if_positive(&hostdata->request_limit);
870 /* If request limit was -1 when we started, it is now even
873 if (request_status < -1)
875 /* Otherwise, we may have run out of requests. */
876 /* If request limit was 0 when we started the adapter is in the
877 * process of performing a login with the server adapter, or
878 * we may have run out of requests.
880 else if (request_status == -1 &&
881 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
883 /* Abort and reset calls should make it through.
884 * Nothing except abort and reset should use the last two
885 * slots unless we had two or less to begin with.
887 else if (request_status < 2 &&
888 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
889 /* In the case that we have less than two requests
890 * available, check the server limit as a combination
891 * of the request limit and the number of requests
892 * in-flight (the size of the send list). If the
893 * server limit is greater than 2, return busy so
894 * that the last two are reserved for reset and abort.
896 int server_limit = request_status;
897 struct srp_event_struct *tmp_evt;
899 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
903 if (server_limit > 2)
908 /* Copy the IU into the transfer area */
909 *evt_struct->xfer_iu = evt_struct->iu;
910 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
912 /* Add this to the sent list. We need to do this
913 * before we actually send
914 * in case it comes back REALLY fast
916 list_add_tail(&evt_struct->list, &hostdata->sent);
918 timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0);
920 evt_struct->timer.expires = jiffies + (timeout * HZ);
921 add_timer(&evt_struct->timer);
924 rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]),
925 be64_to_cpu(crq_as_u64[1]));
927 list_del(&evt_struct->list);
928 del_timer(&evt_struct->timer);
930 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
931 * Firmware will send a CRQ with a transport event (0xFF) to
932 * tell this client what has happened to the transport. This
933 * will be handled in ibmvscsi_handle_crq()
935 if (rc == H_CLOSED) {
936 dev_warn(hostdata->dev, "send warning. "
937 "Receive queue closed, will retry.\n");
940 dev_err(hostdata->dev, "send error %d\n", rc);
942 atomic_inc(&hostdata->request_limit);
949 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
951 free_event_struct(&hostdata->pool, evt_struct);
952 if (srp_req && request_status != -1)
953 atomic_inc(&hostdata->request_limit);
954 return SCSI_MLQUEUE_HOST_BUSY;
957 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
959 if (evt_struct->cmnd != NULL) {
960 evt_struct->cmnd->result = DID_ERROR << 16;
961 evt_struct->cmnd_done(evt_struct->cmnd);
962 } else if (evt_struct->done)
963 evt_struct->done(evt_struct);
965 free_event_struct(&hostdata->pool, evt_struct);
970 * handle_cmd_rsp: - Handle responses from commands
971 * @evt_struct: srp_event_struct to be handled
973 * Used as a callback by when sending scsi cmds.
974 * Gets called by ibmvscsi_handle_crq()
976 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
978 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
979 struct scsi_cmnd *cmnd = evt_struct->cmnd;
981 if (unlikely(rsp->opcode != SRP_RSP)) {
982 if (printk_ratelimit())
983 dev_warn(evt_struct->hostdata->dev,
984 "bad SRP RSP type %#02x\n", rsp->opcode);
988 cmnd->result |= rsp->status;
989 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
990 memcpy(cmnd->sense_buffer,
992 be32_to_cpu(rsp->sense_data_len));
993 unmap_cmd_data(&evt_struct->iu.srp.cmd,
995 evt_struct->hostdata->dev);
997 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
999 be32_to_cpu(rsp->data_out_res_cnt));
1000 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
1001 scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt));
1004 if (evt_struct->cmnd_done)
1005 evt_struct->cmnd_done(cmnd);
1009 * lun_from_dev: - Returns the lun of the scsi device
1010 * @dev: struct scsi_device
1013 static inline u16 lun_from_dev(struct scsi_device *dev)
1015 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
1019 * ibmvscsi_queue: - The queuecommand function of the scsi template
1020 * @cmd: struct scsi_cmnd to be executed
1021 * @done: Callback function to be called when cmd is completed
1023 static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
1024 void (*done) (struct scsi_cmnd *))
1026 struct srp_cmd *srp_cmd;
1027 struct srp_event_struct *evt_struct;
1028 struct srp_indirect_buf *indirect;
1029 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
1030 u16 lun = lun_from_dev(cmnd->device);
1033 cmnd->result = (DID_OK << 16);
1034 evt_struct = get_event_struct(&hostdata->pool);
1036 return SCSI_MLQUEUE_HOST_BUSY;
1038 /* Set up the actual SRP IU */
1039 srp_cmd = &evt_struct->iu.srp.cmd;
1040 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
1041 srp_cmd->opcode = SRP_CMD;
1042 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
1043 int_to_scsilun(lun, &srp_cmd->lun);
1045 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
1046 if (!firmware_has_feature(FW_FEATURE_CMO))
1047 sdev_printk(KERN_ERR, cmnd->device,
1048 "couldn't convert cmd to srp_cmd\n");
1049 free_event_struct(&hostdata->pool, evt_struct);
1050 return SCSI_MLQUEUE_HOST_BUSY;
1053 init_event_struct(evt_struct,
1056 cmnd->request->timeout/HZ);
1058 evt_struct->cmnd = cmnd;
1059 evt_struct->cmnd_done = done;
1061 /* Fix up dma address of the buffer itself */
1062 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
1063 out_fmt = srp_cmd->buf_fmt >> 4;
1064 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
1065 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
1066 out_fmt == SRP_DATA_DESC_INDIRECT) &&
1067 indirect->table_desc.va == 0) {
1068 indirect->table_desc.va =
1069 cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) +
1070 offsetof(struct srp_cmd, add_data) +
1071 offsetof(struct srp_indirect_buf, desc_list));
1074 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
1077 static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
1079 /* ------------------------------------------------------------
1080 * Routines for driver initialization
1084 * map_persist_bufs: - Pre-map persistent data for adapter logins
1085 * @hostdata: ibmvscsi_host_data of host
1087 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
1088 * Return 1 on error, 0 on success.
1090 static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
1093 hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
1094 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1096 if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
1097 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
1101 hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
1102 &hostdata->madapter_info,
1103 sizeof(hostdata->madapter_info),
1105 if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
1106 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
1107 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1108 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1116 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
1117 * @hostdata: ibmvscsi_host_data of host
1119 * Unmap the capabilities and adapter info DMA buffers
1121 static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
1123 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1124 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1126 dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
1127 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
1131 * login_rsp: - Handle response to SRP login request
1132 * @evt_struct: srp_event_struct with the response
1134 * Used as a "done" callback by when sending srp_login. Gets called
1135 * by ibmvscsi_handle_crq()
1137 static void login_rsp(struct srp_event_struct *evt_struct)
1139 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1140 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
1141 case SRP_LOGIN_RSP: /* it worked! */
1143 case SRP_LOGIN_REJ: /* refused! */
1144 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
1145 evt_struct->xfer_iu->srp.login_rej.reason);
1147 atomic_set(&hostdata->request_limit, -1);
1150 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
1151 evt_struct->xfer_iu->srp.login_rsp.opcode);
1153 atomic_set(&hostdata->request_limit, -1);
1157 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
1158 hostdata->client_migrated = 0;
1160 /* Now we know what the real request-limit is.
1161 * This value is set rather than added to request_limit because
1162 * request_limit could have been set to -1 by this client.
1164 atomic_set(&hostdata->request_limit,
1165 be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta));
1167 /* If we had any pending I/Os, kick them */
1168 scsi_unblock_requests(hostdata->host);
1172 * send_srp_login: - Sends the srp login
1173 * @hostdata: ibmvscsi_host_data of host
1175 * Returns zero if successful.
1177 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
1180 unsigned long flags;
1181 struct srp_login_req *login;
1182 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
1184 BUG_ON(!evt_struct);
1185 init_event_struct(evt_struct, login_rsp,
1186 VIOSRP_SRP_FORMAT, login_timeout);
1188 login = &evt_struct->iu.srp.login_req;
1189 memset(login, 0, sizeof(*login));
1190 login->opcode = SRP_LOGIN_REQ;
1191 login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
1192 login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
1193 SRP_BUF_FORMAT_INDIRECT);
1195 spin_lock_irqsave(hostdata->host->host_lock, flags);
1196 /* Start out with a request limit of 0, since this is negotiated in
1197 * the login request we are just sending and login requests always
1198 * get sent by the driver regardless of request_limit.
1200 atomic_set(&hostdata->request_limit, 0);
1202 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
1203 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1204 dev_info(hostdata->dev, "sent SRP login\n");
1209 * capabilities_rsp: - Handle response to MAD adapter capabilities request
1210 * @evt_struct: srp_event_struct with the response
1212 * Used as a "done" callback by when sending adapter_info.
1214 static void capabilities_rsp(struct srp_event_struct *evt_struct)
1216 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1218 if (evt_struct->xfer_iu->mad.capabilities.common.status) {
1219 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
1220 evt_struct->xfer_iu->mad.capabilities.common.status);
1222 if (hostdata->caps.migration.common.server_support !=
1223 cpu_to_be16(SERVER_SUPPORTS_CAP))
1224 dev_info(hostdata->dev, "Partition migration not supported\n");
1226 if (client_reserve) {
1227 if (hostdata->caps.reserve.common.server_support ==
1228 cpu_to_be16(SERVER_SUPPORTS_CAP))
1229 dev_info(hostdata->dev, "Client reserve enabled\n");
1231 dev_info(hostdata->dev, "Client reserve not supported\n");
1235 send_srp_login(hostdata);
1239 * send_mad_capabilities: - Sends the mad capabilities request
1240 * and stores the result so it can be retrieved with
1241 * @hostdata: ibmvscsi_host_data of host
1243 static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
1245 struct viosrp_capabilities *req;
1246 struct srp_event_struct *evt_struct;
1247 unsigned long flags;
1248 struct device_node *of_node = hostdata->dev->of_node;
1249 const char *location;
1251 evt_struct = get_event_struct(&hostdata->pool);
1252 BUG_ON(!evt_struct);
1254 init_event_struct(evt_struct, capabilities_rsp,
1255 VIOSRP_MAD_FORMAT, info_timeout);
1257 req = &evt_struct->iu.mad.capabilities;
1258 memset(req, 0, sizeof(*req));
1260 hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED);
1261 if (hostdata->client_migrated)
1262 hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);
1264 strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
1265 sizeof(hostdata->caps.name));
1267 location = of_get_property(of_node, "ibm,loc-code", NULL);
1268 location = location ? location : dev_name(hostdata->dev);
1269 strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
1271 req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);
1272 req->buffer = cpu_to_be64(hostdata->caps_addr);
1274 hostdata->caps.migration.common.cap_type =
1275 cpu_to_be32(MIGRATION_CAPABILITIES);
1276 hostdata->caps.migration.common.length =
1277 cpu_to_be16(sizeof(hostdata->caps.migration));
1278 hostdata->caps.migration.common.server_support =
1279 cpu_to_be16(SERVER_SUPPORTS_CAP);
1280 hostdata->caps.migration.ecl = cpu_to_be32(1);
1282 if (client_reserve) {
1283 hostdata->caps.reserve.common.cap_type =
1284 cpu_to_be32(RESERVATION_CAPABILITIES);
1285 hostdata->caps.reserve.common.length =
1286 cpu_to_be16(sizeof(hostdata->caps.reserve));
1287 hostdata->caps.reserve.common.server_support =
1288 cpu_to_be16(SERVER_SUPPORTS_CAP);
1289 hostdata->caps.reserve.type =
1290 cpu_to_be32(CLIENT_RESERVE_SCSI_2);
1291 req->common.length =
1292 cpu_to_be16(sizeof(hostdata->caps));
1294 req->common.length = cpu_to_be16(sizeof(hostdata->caps) -
1295 sizeof(hostdata->caps.reserve));
1297 spin_lock_irqsave(hostdata->host->host_lock, flags);
1298 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1299 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
1300 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1304 * fast_fail_rsp: - Handle response to MAD enable fast fail
1305 * @evt_struct: srp_event_struct with the response
1307 * Used as a "done" callback by when sending enable fast fail. Gets called
1308 * by ibmvscsi_handle_crq()
1310 static void fast_fail_rsp(struct srp_event_struct *evt_struct)
1312 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1313 u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status);
1315 if (status == VIOSRP_MAD_NOT_SUPPORTED)
1316 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1317 else if (status == VIOSRP_MAD_FAILED)
1318 dev_err(hostdata->dev, "fast_fail request failed\n");
1319 else if (status != VIOSRP_MAD_SUCCESS)
1320 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1322 send_mad_capabilities(hostdata);
1326 * init_host - Start host initialization
1327 * @hostdata: ibmvscsi_host_data of host
1329 * Returns zero if successful.
1331 static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1334 unsigned long flags;
1335 struct viosrp_fast_fail *fast_fail_mad;
1336 struct srp_event_struct *evt_struct;
1339 send_mad_capabilities(hostdata);
1343 evt_struct = get_event_struct(&hostdata->pool);
1344 BUG_ON(!evt_struct);
1346 init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1348 fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1349 memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1350 fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL);
1351 fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad));
1353 spin_lock_irqsave(hostdata->host->host_lock, flags);
1354 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1355 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1360 * adapter_info_rsp: - Handle response to MAD adapter info request
1361 * @evt_struct: srp_event_struct with the response
1363 * Used as a "done" callback by when sending adapter_info. Gets called
1364 * by ibmvscsi_handle_crq()
1366 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1368 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1370 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1371 dev_err(hostdata->dev, "error %d getting adapter info\n",
1372 evt_struct->xfer_iu->mad.adapter_info.common.status);
1374 dev_info(hostdata->dev, "host srp version: %s, "
1375 "host partition %s (%d), OS %d, max io %u\n",
1376 hostdata->madapter_info.srp_version,
1377 hostdata->madapter_info.partition_name,
1378 be32_to_cpu(hostdata->madapter_info.partition_number),
1379 be32_to_cpu(hostdata->madapter_info.os_type),
1380 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));
1382 if (hostdata->madapter_info.port_max_txu[0])
1383 hostdata->host->max_sectors =
1384 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9;
1386 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX &&
1387 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1388 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1389 hostdata->madapter_info.srp_version);
1390 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1392 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1395 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) {
1396 enable_fast_fail(hostdata);
1401 send_srp_login(hostdata);
1405 * send_mad_adapter_info: - Sends the mad adapter info request
1406 * and stores the result so it can be retrieved with
1407 * sysfs. We COULD consider causing a failure if the
1408 * returned SRP version doesn't match ours.
1409 * @hostdata: ibmvscsi_host_data of host
1411 * Returns zero if successful.
1413 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1415 struct viosrp_adapter_info *req;
1416 struct srp_event_struct *evt_struct;
1417 unsigned long flags;
1419 evt_struct = get_event_struct(&hostdata->pool);
1420 BUG_ON(!evt_struct);
1422 init_event_struct(evt_struct,
1427 req = &evt_struct->iu.mad.adapter_info;
1428 memset(req, 0x00, sizeof(*req));
1430 req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE);
1431 req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info));
1432 req->buffer = cpu_to_be64(hostdata->adapter_info_addr);
1434 spin_lock_irqsave(hostdata->host->host_lock, flags);
1435 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1436 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1437 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1441 * init_adapter: Start virtual adapter initialization sequence
1444 static void init_adapter(struct ibmvscsi_host_data *hostdata)
1446 send_mad_adapter_info(hostdata);
1450 * sync_completion: Signal that a synchronous command has completed
1451 * Note that after returning from this call, the evt_struct is freed.
1452 * the caller waiting on this completion shouldn't touch the evt_struct
1455 static void sync_completion(struct srp_event_struct *evt_struct)
1457 /* copy the response back */
1458 if (evt_struct->sync_srp)
1459 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1461 complete(&evt_struct->comp);
1465 * ibmvscsi_abort: Abort a command...from scsi host template
1466 * send this over to the server and wait synchronously for the response
1468 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1470 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1471 struct srp_tsk_mgmt *tsk_mgmt;
1472 struct srp_event_struct *evt;
1473 struct srp_event_struct *tmp_evt, *found_evt;
1474 union viosrp_iu srp_rsp;
1476 unsigned long flags;
1477 u16 lun = lun_from_dev(cmd->device);
1478 unsigned long wait_switch = 0;
1480 /* First, find this command in our sent list so we can figure
1481 * out the correct tag
1483 spin_lock_irqsave(hostdata->host->host_lock, flags);
1484 wait_switch = jiffies + (init_timeout * HZ);
1487 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1488 if (tmp_evt->cmnd == cmd) {
1489 found_evt = tmp_evt;
1495 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1499 evt = get_event_struct(&hostdata->pool);
1501 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1502 sdev_printk(KERN_ERR, cmd->device,
1503 "failed to allocate abort event\n");
1507 init_event_struct(evt,
1512 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1514 /* Set up an abort SRP command */
1515 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1516 tsk_mgmt->opcode = SRP_TSK_MGMT;
1517 int_to_scsilun(lun, &tsk_mgmt->lun);
1518 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1519 tsk_mgmt->task_tag = (u64) found_evt;
1521 evt->sync_srp = &srp_rsp;
1523 init_completion(&evt->comp);
1524 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1526 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1529 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1531 spin_lock_irqsave(hostdata->host->host_lock, flags);
1532 } while (time_before(jiffies, wait_switch));
1534 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1537 sdev_printk(KERN_ERR, cmd->device,
1538 "failed to send abort() event. rc=%d\n", rsp_rc);
1542 sdev_printk(KERN_INFO, cmd->device,
1543 "aborting command. lun 0x%llx, tag 0x%llx\n",
1544 (((u64) lun) << 48), (u64) found_evt);
1546 wait_for_completion(&evt->comp);
1548 /* make sure we got a good response */
1549 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1550 if (printk_ratelimit())
1551 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1552 srp_rsp.srp.rsp.opcode);
1556 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1557 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1559 rsp_rc = srp_rsp.srp.rsp.status;
1562 if (printk_ratelimit())
1563 sdev_printk(KERN_WARNING, cmd->device,
1564 "abort code %d for task tag 0x%llx\n",
1565 rsp_rc, tsk_mgmt->task_tag);
1569 /* Because we dropped the spinlock above, it's possible
1570 * The event is no longer in our list. Make sure it didn't
1571 * complete while we were aborting
1573 spin_lock_irqsave(hostdata->host->host_lock, flags);
1575 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1576 if (tmp_evt->cmnd == cmd) {
1577 found_evt = tmp_evt;
1582 if (found_evt == NULL) {
1583 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1584 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1585 tsk_mgmt->task_tag);
1589 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1590 tsk_mgmt->task_tag);
1592 cmd->result = (DID_ABORT << 16);
1593 list_del(&found_evt->list);
1594 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1595 found_evt->hostdata->dev);
1596 free_event_struct(&found_evt->hostdata->pool, found_evt);
1597 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1598 atomic_inc(&hostdata->request_limit);
1603 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1604 * template send this over to the server and wait synchronously for the
1607 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1609 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1610 struct srp_tsk_mgmt *tsk_mgmt;
1611 struct srp_event_struct *evt;
1612 struct srp_event_struct *tmp_evt, *pos;
1613 union viosrp_iu srp_rsp;
1615 unsigned long flags;
1616 u16 lun = lun_from_dev(cmd->device);
1617 unsigned long wait_switch = 0;
1619 spin_lock_irqsave(hostdata->host->host_lock, flags);
1620 wait_switch = jiffies + (init_timeout * HZ);
1622 evt = get_event_struct(&hostdata->pool);
1624 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1625 sdev_printk(KERN_ERR, cmd->device,
1626 "failed to allocate reset event\n");
1630 init_event_struct(evt,
1635 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1637 /* Set up a lun reset SRP command */
1638 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1639 tsk_mgmt->opcode = SRP_TSK_MGMT;
1640 int_to_scsilun(lun, &tsk_mgmt->lun);
1641 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1643 evt->sync_srp = &srp_rsp;
1645 init_completion(&evt->comp);
1646 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1648 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1651 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1653 spin_lock_irqsave(hostdata->host->host_lock, flags);
1654 } while (time_before(jiffies, wait_switch));
1656 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1659 sdev_printk(KERN_ERR, cmd->device,
1660 "failed to send reset event. rc=%d\n", rsp_rc);
1664 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1665 (((u64) lun) << 48));
1667 wait_for_completion(&evt->comp);
1669 /* make sure we got a good response */
1670 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1671 if (printk_ratelimit())
1672 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1673 srp_rsp.srp.rsp.opcode);
1677 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1678 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1680 rsp_rc = srp_rsp.srp.rsp.status;
1683 if (printk_ratelimit())
1684 sdev_printk(KERN_WARNING, cmd->device,
1685 "reset code %d for task tag 0x%llx\n",
1686 rsp_rc, tsk_mgmt->task_tag);
1690 /* We need to find all commands for this LUN that have not yet been
1691 * responded to, and fail them with DID_RESET
1693 spin_lock_irqsave(hostdata->host->host_lock, flags);
1694 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1695 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1697 tmp_evt->cmnd->result = (DID_RESET << 16);
1698 list_del(&tmp_evt->list);
1699 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1700 tmp_evt->hostdata->dev);
1701 free_event_struct(&tmp_evt->hostdata->pool,
1703 atomic_inc(&hostdata->request_limit);
1704 if (tmp_evt->cmnd_done)
1705 tmp_evt->cmnd_done(tmp_evt->cmnd);
1706 else if (tmp_evt->done)
1707 tmp_evt->done(tmp_evt);
1710 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1715 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1716 * @cmd: struct scsi_cmnd having problems
1718 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1720 unsigned long wait_switch = 0;
1721 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1723 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1725 ibmvscsi_reset_host(hostdata);
1727 for (wait_switch = jiffies + (init_timeout * HZ);
1728 time_before(jiffies, wait_switch) &&
1729 atomic_read(&hostdata->request_limit) < 2;) {
1734 if (atomic_read(&hostdata->request_limit) <= 0)
1741 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1742 * @crq: Command/Response queue
1743 * @hostdata: ibmvscsi_host_data of host
1746 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1747 struct ibmvscsi_host_data *hostdata)
1750 unsigned long flags;
1751 /* The hypervisor copies our tag value here so no byteswapping */
1752 struct srp_event_struct *evt_struct =
1753 (__force struct srp_event_struct *)crq->IU_data_ptr;
1754 switch (crq->valid) {
1755 case VIOSRP_CRQ_INIT_RSP: /* initialization */
1756 switch (crq->format) {
1757 case VIOSRP_CRQ_INIT: /* Initialization message */
1758 dev_info(hostdata->dev, "partner initialized\n");
1759 /* Send back a response */
1760 rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
1763 init_adapter(hostdata);
1765 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1769 case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */
1770 dev_info(hostdata->dev, "partner initialization complete\n");
1773 init_adapter(hostdata);
1776 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1779 case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */
1780 scsi_block_requests(hostdata->host);
1781 atomic_set(&hostdata->request_limit, 0);
1782 if (crq->format == 0x06) {
1783 /* We need to re-setup the interpartition connection */
1784 dev_info(hostdata->dev, "Re-enabling adapter!\n");
1785 hostdata->client_migrated = 1;
1786 hostdata->reenable_crq = 1;
1787 purge_requests(hostdata, DID_REQUEUE);
1788 wake_up(&hostdata->work_wait_q);
1790 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1792 ibmvscsi_reset_host(hostdata);
1795 case VIOSRP_CRQ_CMD_RSP: /* real payload */
1798 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1803 /* The only kind of payload CRQs we should get are responses to
1804 * things we send. Make sure this response is to something we
1807 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1808 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1813 if (atomic_read(&evt_struct->free)) {
1814 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1819 if (crq->format == VIOSRP_SRP_FORMAT)
1820 atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta),
1821 &hostdata->request_limit);
1823 del_timer(&evt_struct->timer);
1825 if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1826 evt_struct->cmnd->result = DID_ERROR << 16;
1827 if (evt_struct->done)
1828 evt_struct->done(evt_struct);
1830 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1833 * Lock the host_lock before messing with these structures, since we
1834 * are running in a task context
1836 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1837 list_del(&evt_struct->list);
1838 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1839 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1843 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1844 * @sdev: struct scsi_device device to configure
1846 * Enable allow_restart for a device if it is a disk. Adjust the
1847 * queue_depth here also as is required by the documentation for
1848 * struct scsi_host_template.
1850 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1852 struct Scsi_Host *shost = sdev->host;
1853 unsigned long lock_flags = 0;
1855 spin_lock_irqsave(shost->host_lock, lock_flags);
1856 if (sdev->type == TYPE_DISK) {
1857 sdev->allow_restart = 1;
1858 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1860 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1865 * ibmvscsi_change_queue_depth - Change the device's queue depth
1866 * @sdev: scsi device struct
1867 * @qdepth: depth to set
1868 * @reason: calling context
1873 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1875 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1876 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1877 return scsi_change_queue_depth(sdev, qdepth);
1880 /* ------------------------------------------------------------
1883 static ssize_t show_host_vhost_loc(struct device *dev,
1884 struct device_attribute *attr, char *buf)
1886 struct Scsi_Host *shost = class_to_shost(dev);
1887 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1890 len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1891 hostdata->caps.loc);
1895 static struct device_attribute ibmvscsi_host_vhost_loc = {
1897 .name = "vhost_loc",
1900 .show = show_host_vhost_loc,
1903 static ssize_t show_host_vhost_name(struct device *dev,
1904 struct device_attribute *attr, char *buf)
1906 struct Scsi_Host *shost = class_to_shost(dev);
1907 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1910 len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1911 hostdata->caps.name);
1915 static struct device_attribute ibmvscsi_host_vhost_name = {
1917 .name = "vhost_name",
1920 .show = show_host_vhost_name,
1923 static ssize_t show_host_srp_version(struct device *dev,
1924 struct device_attribute *attr, char *buf)
1926 struct Scsi_Host *shost = class_to_shost(dev);
1927 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1930 len = snprintf(buf, PAGE_SIZE, "%s\n",
1931 hostdata->madapter_info.srp_version);
1935 static struct device_attribute ibmvscsi_host_srp_version = {
1937 .name = "srp_version",
1940 .show = show_host_srp_version,
1943 static ssize_t show_host_partition_name(struct device *dev,
1944 struct device_attribute *attr,
1947 struct Scsi_Host *shost = class_to_shost(dev);
1948 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1951 len = snprintf(buf, PAGE_SIZE, "%s\n",
1952 hostdata->madapter_info.partition_name);
1956 static struct device_attribute ibmvscsi_host_partition_name = {
1958 .name = "partition_name",
1961 .show = show_host_partition_name,
1964 static ssize_t show_host_partition_number(struct device *dev,
1965 struct device_attribute *attr,
1968 struct Scsi_Host *shost = class_to_shost(dev);
1969 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1972 len = snprintf(buf, PAGE_SIZE, "%d\n",
1973 be32_to_cpu(hostdata->madapter_info.partition_number));
1977 static struct device_attribute ibmvscsi_host_partition_number = {
1979 .name = "partition_number",
1982 .show = show_host_partition_number,
1985 static ssize_t show_host_mad_version(struct device *dev,
1986 struct device_attribute *attr, char *buf)
1988 struct Scsi_Host *shost = class_to_shost(dev);
1989 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1992 len = snprintf(buf, PAGE_SIZE, "%d\n",
1993 be32_to_cpu(hostdata->madapter_info.mad_version));
1997 static struct device_attribute ibmvscsi_host_mad_version = {
1999 .name = "mad_version",
2002 .show = show_host_mad_version,
2005 static ssize_t show_host_os_type(struct device *dev,
2006 struct device_attribute *attr, char *buf)
2008 struct Scsi_Host *shost = class_to_shost(dev);
2009 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2012 len = snprintf(buf, PAGE_SIZE, "%d\n",
2013 be32_to_cpu(hostdata->madapter_info.os_type));
2017 static struct device_attribute ibmvscsi_host_os_type = {
2022 .show = show_host_os_type,
2025 static ssize_t show_host_config(struct device *dev,
2026 struct device_attribute *attr, char *buf)
2031 static struct device_attribute ibmvscsi_host_config = {
2036 .show = show_host_config,
2039 static struct device_attribute *ibmvscsi_attrs[] = {
2040 &ibmvscsi_host_vhost_loc,
2041 &ibmvscsi_host_vhost_name,
2042 &ibmvscsi_host_srp_version,
2043 &ibmvscsi_host_partition_name,
2044 &ibmvscsi_host_partition_number,
2045 &ibmvscsi_host_mad_version,
2046 &ibmvscsi_host_os_type,
2047 &ibmvscsi_host_config,
2051 /* ------------------------------------------------------------
2052 * SCSI driver registration
2054 static struct scsi_host_template driver_template = {
2055 .module = THIS_MODULE,
2056 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
2057 .proc_name = "ibmvscsi",
2058 .queuecommand = ibmvscsi_queuecommand,
2059 .eh_timed_out = srp_timed_out,
2060 .eh_abort_handler = ibmvscsi_eh_abort_handler,
2061 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
2062 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
2063 .slave_configure = ibmvscsi_slave_configure,
2064 .change_queue_depth = ibmvscsi_change_queue_depth,
2065 .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
2066 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
2068 .sg_tablesize = SG_ALL,
2069 .shost_attrs = ibmvscsi_attrs,
2073 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
2075 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
2078 * Number of bytes of IO data the driver will need to perform well.
2080 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
2082 /* iu_storage data allocated in initialize_event_pool */
2083 unsigned long desired_io = max_events * sizeof(union viosrp_iu);
2085 /* add io space for sg data */
2086 desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
2087 IBMVSCSI_CMDS_PER_LUN_DEFAULT);
2092 static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
2095 char *action = "reset";
2097 if (hostdata->reset_crq) {
2099 hostdata->reset_crq = 0;
2101 rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
2103 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2104 vio_enable_interrupts(to_vio_dev(hostdata->dev));
2105 } else if (hostdata->reenable_crq) {
2108 rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
2109 hostdata->reenable_crq = 0;
2111 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2116 atomic_set(&hostdata->request_limit, -1);
2117 dev_err(hostdata->dev, "error after %s\n", action);
2120 scsi_unblock_requests(hostdata->host);
2123 static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2125 if (kthread_should_stop())
2127 else if (hostdata->reset_crq) {
2130 } else if (hostdata->reenable_crq) {
2138 static int ibmvscsi_work(void *data)
2140 struct ibmvscsi_host_data *hostdata = data;
2143 set_user_nice(current, MIN_NICE);
2146 rc = wait_event_interruptible(hostdata->work_wait_q,
2147 ibmvscsi_work_to_do(hostdata));
2151 if (kthread_should_stop())
2154 ibmvscsi_do_work(hostdata);
2161 * Called by bus code for each adapter
2163 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2165 struct ibmvscsi_host_data *hostdata;
2166 struct Scsi_Host *host;
2167 struct device *dev = &vdev->dev;
2168 struct srp_rport_identifiers ids;
2169 struct srp_rport *rport;
2170 unsigned long wait_switch = 0;
2173 dev_set_drvdata(&vdev->dev, NULL);
2175 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
2177 dev_err(&vdev->dev, "couldn't allocate host data\n");
2178 goto scsi_host_alloc_failed;
2181 host->transportt = ibmvscsi_transport_template;
2182 hostdata = shost_priv(host);
2183 memset(hostdata, 0x00, sizeof(*hostdata));
2184 INIT_LIST_HEAD(&hostdata->sent);
2185 init_waitqueue_head(&hostdata->work_wait_q);
2186 hostdata->host = host;
2187 hostdata->dev = dev;
2188 atomic_set(&hostdata->request_limit, -1);
2189 hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
2191 if (map_persist_bufs(hostdata)) {
2192 dev_err(&vdev->dev, "couldn't map persistent buffers\n");
2193 goto persist_bufs_failed;
2196 hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
2197 "ibmvscsi", host->host_no);
2199 if (IS_ERR(hostdata->work_thread)) {
2200 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
2201 PTR_ERR(hostdata->work_thread));
2202 goto init_crq_failed;
2205 rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
2206 if (rc != 0 && rc != H_RESOURCE) {
2207 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
2210 if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
2211 dev_err(&vdev->dev, "couldn't initialize event pool\n");
2212 goto init_pool_failed;
2215 host->max_lun = IBMVSCSI_MAX_LUN;
2216 host->max_id = max_id;
2217 host->max_channel = max_channel;
2218 host->max_cmd_len = 16;
2221 "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n",
2222 host->max_id, host->max_lun, host->max_channel);
2224 if (scsi_add_host(hostdata->host, hostdata->dev))
2225 goto add_host_failed;
2227 /* we don't have a proper target_port_id so let's use the fake one */
2228 memcpy(ids.port_id, hostdata->madapter_info.partition_name,
2229 sizeof(ids.port_id));
2230 ids.roles = SRP_RPORT_ROLE_TARGET;
2231 rport = srp_rport_add(host, &ids);
2233 goto add_srp_port_failed;
2235 /* Try to send an initialization message. Note that this is allowed
2236 * to fail if the other end is not acive. In that case we don't
2239 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
2240 || rc == H_RESOURCE) {
2242 * Wait around max init_timeout secs for the adapter to finish
2243 * initializing. When we are done initializing, we will have a
2244 * valid request_limit. We don't want Linux scanning before
2247 for (wait_switch = jiffies + (init_timeout * HZ);
2248 time_before(jiffies, wait_switch) &&
2249 atomic_read(&hostdata->request_limit) < 2;) {
2254 /* if we now have a valid request_limit, initiate a scan */
2255 if (atomic_read(&hostdata->request_limit) > 0)
2256 scsi_scan_host(host);
2259 dev_set_drvdata(&vdev->dev, hostdata);
2260 spin_lock(&ibmvscsi_driver_lock);
2261 list_add_tail(&hostdata->host_list, &ibmvscsi_head);
2262 spin_unlock(&ibmvscsi_driver_lock);
2265 add_srp_port_failed:
2266 scsi_remove_host(hostdata->host);
2268 release_event_pool(&hostdata->pool, hostdata);
2270 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
2272 kthread_stop(hostdata->work_thread);
2274 unmap_persist_bufs(hostdata);
2275 persist_bufs_failed:
2276 scsi_host_put(host);
2277 scsi_host_alloc_failed:
2281 static int ibmvscsi_remove(struct vio_dev *vdev)
2283 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2284 unsigned long flags;
2286 srp_remove_host(hostdata->host);
2287 scsi_remove_host(hostdata->host);
2289 purge_requests(hostdata, DID_ERROR);
2291 spin_lock_irqsave(hostdata->host->host_lock, flags);
2292 release_event_pool(&hostdata->pool, hostdata);
2293 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2295 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
2298 kthread_stop(hostdata->work_thread);
2299 unmap_persist_bufs(hostdata);
2301 spin_lock(&ibmvscsi_driver_lock);
2302 list_del(&hostdata->host_list);
2303 spin_unlock(&ibmvscsi_driver_lock);
2305 scsi_host_put(hostdata->host);
2311 * ibmvscsi_resume: Resume from suspend
2312 * @dev: device struct
2314 * We may have lost an interrupt across suspend/resume, so kick the
2317 static int ibmvscsi_resume(struct device *dev)
2319 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2320 vio_disable_interrupts(to_vio_dev(hostdata->dev));
2321 tasklet_schedule(&hostdata->srp_task);
2327 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
2330 static const struct vio_device_id ibmvscsi_device_table[] = {
2331 {"vscsi", "IBM,v-scsi"},
2334 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2336 static const struct dev_pm_ops ibmvscsi_pm_ops = {
2337 .resume = ibmvscsi_resume
2340 static struct vio_driver ibmvscsi_driver = {
2341 .id_table = ibmvscsi_device_table,
2342 .probe = ibmvscsi_probe,
2343 .remove = ibmvscsi_remove,
2344 .get_desired_dma = ibmvscsi_get_desired_dma,
2346 .pm = &ibmvscsi_pm_ops,
2349 static struct srp_function_template ibmvscsi_transport_functions = {
2352 int __init ibmvscsi_module_init(void)
2356 /* Ensure we have two requests to do error recovery */
2357 driver_template.can_queue = max_requests;
2358 max_events = max_requests + 2;
2360 if (!firmware_has_feature(FW_FEATURE_VIO))
2363 ibmvscsi_transport_template =
2364 srp_attach_transport(&ibmvscsi_transport_functions);
2365 if (!ibmvscsi_transport_template)
2368 ret = vio_register_driver(&ibmvscsi_driver);
2370 srp_release_transport(ibmvscsi_transport_template);
2374 void __exit ibmvscsi_module_exit(void)
2376 vio_unregister_driver(&ibmvscsi_driver);
2377 srp_release_transport(ibmvscsi_transport_template);
2380 module_init(ibmvscsi_module_init);
2381 module_exit(ibmvscsi_module_exit);