1 /* ------------------------------------------------------------
3 * (C) Copyright IBM Corporation 1994, 2004
4 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
5 * Santiago Leon (santil@us.ibm.com)
6 * Dave Boutcher (sleddog@us.ibm.com)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
23 * ------------------------------------------------------------
24 * Emulation of a SCSI host adapter for Virtual I/O devices
26 * This driver supports the SCSI adapter implemented by the IBM
27 * Power5 firmware. That SCSI adapter is not a physical adapter,
28 * but allows Linux SCSI peripheral drivers to directly
29 * access devices in another logical partition on the physical system.
31 * The virtual adapter(s) are present in the open firmware device
32 * tree just like real adapters.
34 * One of the capabilities provided on these systems is the ability
35 * to DMA between partitions. The architecture states that for VSCSI,
36 * the server side is allowed to DMA to and from the client. The client
37 * is never trusted to DMA to or from the server directly.
39 * Messages are sent between partitions on a "Command/Response Queue"
40 * (CRQ), which is just a buffer of 16 byte entries in the receiver's
41 * Senders cannot access the buffer directly, but send messages by
42 * making a hypervisor call and passing in the 16 bytes. The hypervisor
43 * puts the message in the next 16 byte space in round-robin fashion,
44 * turns on the high order bit of the message (the valid bit), and
45 * generates an interrupt to the receiver (if interrupts are turned on.)
46 * The receiver just turns off the valid bit when they have copied out
49 * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
50 * (IU) (as defined in the T10 standard available at www.t10.org), gets
51 * a DMA address for the message, and sends it to the server as the
52 * payload of a CRQ message. The server DMAs the SRP IU and processes it,
53 * including doing any additional data transfers. When it is done, it
54 * DMAs the SRP response back to the same address as the request came from,
55 * and sends a CRQ message back to inform the client that the request has
58 * TODO: This is currently pretty tied to the IBM pSeries hypervisor
59 * interfaces. It would be really nice to abstract this above an RDMA
63 #include <linux/module.h>
64 #include <linux/moduleparam.h>
65 #include <linux/dma-mapping.h>
66 #include <linux/delay.h>
67 #include <linux/slab.h>
70 #include <linux/kthread.h>
71 #include <asm/firmware.h>
73 #include <scsi/scsi.h>
74 #include <scsi/scsi_cmnd.h>
75 #include <scsi/scsi_host.h>
76 #include <scsi/scsi_device.h>
77 #include <scsi/scsi_transport_srp.h>
80 /* The values below are somewhat arbitrary default values, but
81 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
82 * Note that there are 3 bits of channel value, 6 bits of id, and
85 static int max_id = 64;
86 static int max_channel = 3;
87 static int init_timeout = 300;
88 static int login_timeout = 60;
89 static int info_timeout = 30;
90 static int abort_timeout = 60;
91 static int reset_timeout = 60;
92 static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
93 static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
94 static int fast_fail = 1;
95 static int client_reserve = 1;
96 static char partition_name[97] = "UNKNOWN";
97 static unsigned int partition_number = -1;
99 static struct scsi_transport_template *ibmvscsi_transport_template;
101 #define IBMVSCSI_VERSION "1.5.9"
103 MODULE_DESCRIPTION("IBM Virtual SCSI");
104 MODULE_AUTHOR("Dave Boutcher");
105 MODULE_LICENSE("GPL");
106 MODULE_VERSION(IBMVSCSI_VERSION);
108 module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
109 MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
110 module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
111 MODULE_PARM_DESC(max_channel, "Largest channel value");
112 module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
113 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
114 module_param_named(max_requests, max_requests, int, S_IRUGO);
115 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
116 module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
117 MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
118 module_param_named(client_reserve, client_reserve, int, S_IRUGO );
119 MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
121 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
122 struct ibmvscsi_host_data *hostdata);
124 /* ------------------------------------------------------------
125 * Routines for managing the command/response queue
128 * ibmvscsi_handle_event: - Interrupt handler for crq events
129 * @irq: number of irq to handle, not used
130 * @dev_instance: ibmvscsi_host_data of host that received interrupt
132 * Disables interrupts and schedules srp_task
133 * Always returns IRQ_HANDLED
135 static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
137 struct ibmvscsi_host_data *hostdata =
138 (struct ibmvscsi_host_data *)dev_instance;
139 vio_disable_interrupts(to_vio_dev(hostdata->dev));
140 tasklet_schedule(&hostdata->srp_task);
145 * release_crq_queue: - Deallocates data and unregisters CRQ
146 * @queue: crq_queue to initialize and register
147 * @host_data: ibmvscsi_host_data of host
149 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
150 * the crq with the hypervisor.
152 static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
153 struct ibmvscsi_host_data *hostdata,
157 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
158 free_irq(vdev->irq, (void *)hostdata);
159 tasklet_kill(&hostdata->srp_task);
163 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
164 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
165 dma_unmap_single(hostdata->dev,
167 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
168 free_page((unsigned long)queue->msgs);
172 * crq_queue_next_crq: - Returns the next entry in message queue
173 * @queue: crq_queue to use
175 * Returns pointer to next entry in queue, or NULL if there are no new
176 * entried in the CRQ.
178 static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
180 struct viosrp_crq *crq;
183 spin_lock_irqsave(&queue->lock, flags);
184 crq = &queue->msgs[queue->cur];
185 if (crq->valid & 0x80) {
186 if (++queue->cur == queue->size)
190 spin_unlock_irqrestore(&queue->lock, flags);
196 * ibmvscsi_send_crq: - Send a CRQ
197 * @hostdata: the adapter
198 * @word1: the first 64 bits of the data
199 * @word2: the second 64 bits of the data
201 static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
202 u64 word1, u64 word2)
204 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
206 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
210 * ibmvscsi_task: - Process srps asynchronously
211 * @data: ibmvscsi_host_data of host
213 static void ibmvscsi_task(void *data)
215 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
216 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
217 struct viosrp_crq *crq;
221 /* Pull all the valid messages off the CRQ */
222 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
223 ibmvscsi_handle_crq(crq, hostdata);
227 vio_enable_interrupts(vdev);
228 crq = crq_queue_next_crq(&hostdata->queue);
230 vio_disable_interrupts(vdev);
231 ibmvscsi_handle_crq(crq, hostdata);
239 static void gather_partition_info(void)
241 struct device_node *rootdn;
243 const char *ppartition_name;
244 const unsigned int *p_number_ptr;
246 /* Retrieve information about this partition */
247 rootdn = of_find_node_by_path("/");
252 ppartition_name = of_get_property(rootdn, "ibm,partition-name", NULL);
254 strncpy(partition_name, ppartition_name,
255 sizeof(partition_name));
256 p_number_ptr = of_get_property(rootdn, "ibm,partition-no", NULL);
258 partition_number = *p_number_ptr;
262 static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
264 memset(&hostdata->madapter_info, 0x00,
265 sizeof(hostdata->madapter_info));
267 dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
268 strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
270 strncpy(hostdata->madapter_info.partition_name, partition_name,
271 sizeof(hostdata->madapter_info.partition_name));
273 hostdata->madapter_info.partition_number = partition_number;
275 hostdata->madapter_info.mad_version = 1;
276 hostdata->madapter_info.os_type = 2;
280 * reset_crq_queue: - resets a crq after a failure
281 * @queue: crq_queue to initialize and register
282 * @hostdata: ibmvscsi_host_data of host
285 static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
286 struct ibmvscsi_host_data *hostdata)
289 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
295 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
296 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
298 /* Clean out the queue */
299 memset(queue->msgs, 0x00, PAGE_SIZE);
302 set_adapter_info(hostdata);
304 /* And re-open it again */
305 rc = plpar_hcall_norets(H_REG_CRQ,
307 queue->msg_token, PAGE_SIZE);
309 /* Adapter is good, but other end is not ready */
310 dev_warn(hostdata->dev, "Partner adapter not ready\n");
311 } else if (rc != 0) {
312 dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
318 * initialize_crq_queue: - Initializes and registers CRQ with hypervisor
319 * @queue: crq_queue to initialize and register
320 * @hostdata: ibmvscsi_host_data of host
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,
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 * reenable_crq_queue: - reenables a crq after
409 * @queue: crq_queue to initialize and register
410 * @hostdata: ibmvscsi_host_data of host
413 static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
414 struct ibmvscsi_host_data *hostdata)
417 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
419 /* Re-enable the CRQ */
423 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
424 } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
427 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
431 /* ------------------------------------------------------------
432 * Routines for the event pool and event structs
435 * initialize_event_pool: - Allocates and initializes the event pool for a host
436 * @pool: event_pool to be initialized
437 * @size: Number of events in pool
438 * @hostdata: ibmvscsi_host_data who owns the event pool
440 * Returns zero on success.
442 static int initialize_event_pool(struct event_pool *pool,
443 int size, struct ibmvscsi_host_data *hostdata)
449 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
454 dma_alloc_coherent(hostdata->dev,
455 pool->size * sizeof(*pool->iu_storage),
457 if (!pool->iu_storage) {
462 for (i = 0; i < pool->size; ++i) {
463 struct srp_event_struct *evt = &pool->events[i];
464 memset(&evt->crq, 0x00, sizeof(evt->crq));
465 atomic_set(&evt->free, 1);
466 evt->crq.valid = 0x80;
467 evt->crq.IU_length = sizeof(*evt->xfer_iu);
468 evt->crq.IU_data_ptr = pool->iu_token +
469 sizeof(*evt->xfer_iu) * i;
470 evt->xfer_iu = pool->iu_storage + i;
471 evt->hostdata = hostdata;
472 evt->ext_list = NULL;
473 evt->ext_list_token = 0;
480 * release_event_pool: - Frees memory of an event pool of a host
481 * @pool: event_pool to be released
482 * @hostdata: ibmvscsi_host_data who owns the even pool
484 * Returns zero on success.
486 static void release_event_pool(struct event_pool *pool,
487 struct ibmvscsi_host_data *hostdata)
490 for (i = 0; i < pool->size; ++i) {
491 if (atomic_read(&pool->events[i].free) != 1)
493 if (pool->events[i].ext_list) {
494 dma_free_coherent(hostdata->dev,
495 SG_ALL * sizeof(struct srp_direct_buf),
496 pool->events[i].ext_list,
497 pool->events[i].ext_list_token);
501 dev_warn(hostdata->dev, "releasing event pool with %d "
502 "events still in use?\n", in_use);
504 dma_free_coherent(hostdata->dev,
505 pool->size * sizeof(*pool->iu_storage),
506 pool->iu_storage, pool->iu_token);
510 * valid_event_struct: - Determines if event is valid.
511 * @pool: event_pool that contains the event
512 * @evt: srp_event_struct to be checked for validity
514 * Returns zero if event is invalid, one otherwise.
516 static int valid_event_struct(struct event_pool *pool,
517 struct srp_event_struct *evt)
519 int index = evt - pool->events;
520 if (index < 0 || index >= pool->size) /* outside of bounds */
522 if (evt != pool->events + index) /* unaligned */
528 * ibmvscsi_free-event_struct: - Changes status of event to "free"
529 * @pool: event_pool that contains the event
530 * @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_evt_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
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 = 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 * @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 = sg_dma_address(sg);
663 descr->len = sg_dma_len(sg);
665 total_length += sg_dma_len(sg);
671 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
672 * @cmd: Scsi_Cmnd with the scatterlist
673 * @srp_cmd: srp_cmd that contains the memory descriptor
674 * @dev: device for which to map dma memory
676 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
677 * Returns 1 on success.
679 static int map_sg_data(struct scsi_cmnd *cmd,
680 struct srp_event_struct *evt_struct,
681 struct srp_cmd *srp_cmd, struct device *dev)
685 u64 total_length = 0;
686 struct srp_direct_buf *data =
687 (struct srp_direct_buf *) srp_cmd->add_data;
688 struct srp_indirect_buf *indirect =
689 (struct srp_indirect_buf *) data;
691 sg_mapped = scsi_dma_map(cmd);
694 else if (sg_mapped < 0)
697 set_srp_direction(cmd, srp_cmd, sg_mapped);
699 /* special case; we can use a single direct descriptor */
700 if (sg_mapped == 1) {
701 map_sg_list(cmd, sg_mapped, data);
705 indirect->table_desc.va = 0;
706 indirect->table_desc.len = sg_mapped * 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 = 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 = total_length;
735 indirect->table_desc.va = evt_struct->ext_list_token;
736 indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
737 memcpy(indirect->desc_list, evt_struct->ext_list,
738 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
743 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
744 * @cmd: struct scsi_cmnd with the memory to be mapped
745 * @srp_cmd: srp_cmd that contains the memory descriptor
746 * @dev: dma device for which to map dma memory
748 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
749 * Returns 1 on success.
751 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
752 struct srp_event_struct *evt_struct,
753 struct srp_cmd *srp_cmd, struct device *dev)
755 switch (cmd->sc_data_direction) {
756 case DMA_FROM_DEVICE:
761 case DMA_BIDIRECTIONAL:
762 sdev_printk(KERN_ERR, cmd->device,
763 "Can't map DMA_BIDIRECTIONAL to read/write\n");
766 sdev_printk(KERN_ERR, cmd->device,
767 "Unknown data direction 0x%02x; can't map!\n",
768 cmd->sc_data_direction);
772 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
776 * purge_requests: Our virtual adapter just shut down. purge any sent requests
777 * @hostdata: the adapter
779 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
781 struct srp_event_struct *evt;
784 spin_lock_irqsave(hostdata->host->host_lock, flags);
785 while (!list_empty(&hostdata->sent)) {
786 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
787 list_del(&evt->list);
788 del_timer(&evt->timer);
790 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
792 evt->cmnd->result = (error_code << 16);
793 unmap_cmd_data(&evt->iu.srp.cmd, evt,
796 evt->cmnd_done(evt->cmnd);
797 } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&
798 evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
800 free_event_struct(&evt->hostdata->pool, evt);
801 spin_lock_irqsave(hostdata->host->host_lock, flags);
803 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
807 * ibmvscsi_reset_host - Reset the connection to the server
808 * @hostdata: struct ibmvscsi_host_data to reset
810 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
812 scsi_block_requests(hostdata->host);
813 atomic_set(&hostdata->request_limit, 0);
815 purge_requests(hostdata, DID_ERROR);
816 hostdata->reset_crq = 1;
817 wake_up(&hostdata->work_wait_q);
821 * ibmvscsi_timeout - Internal command timeout handler
822 * @evt_struct: struct srp_event_struct that timed out
824 * Called when an internally generated command times out
826 static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
828 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
830 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
831 evt_struct->iu.srp.cmd.opcode);
833 ibmvscsi_reset_host(hostdata);
837 /* ------------------------------------------------------------
838 * Routines for sending and receiving SRPs
841 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
842 * @evt_struct: evt_struct to be sent
843 * @hostdata: ibmvscsi_host_data of host
844 * @timeout: timeout in seconds - 0 means do not time command
846 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
847 * Note that this routine assumes that host_lock is held for synchronization
849 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
850 struct ibmvscsi_host_data *hostdata,
851 unsigned long timeout)
853 u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
854 int request_status = 0;
858 /* If we have exhausted our request limit, just fail this request,
859 * unless it is for a reset or abort.
860 * Note that there are rare cases involving driver generated requests
861 * (such as task management requests) that the mid layer may think we
862 * can handle more requests (can_queue) when we actually can't
864 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
867 atomic_dec_if_positive(&hostdata->request_limit);
868 /* If request limit was -1 when we started, it is now even
871 if (request_status < -1)
873 /* Otherwise, we may have run out of requests. */
874 /* If request limit was 0 when we started the adapter is in the
875 * process of performing a login with the server adapter, or
876 * we may have run out of requests.
878 else if (request_status == -1 &&
879 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
881 /* Abort and reset calls should make it through.
882 * Nothing except abort and reset should use the last two
883 * slots unless we had two or less to begin with.
885 else if (request_status < 2 &&
886 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
887 /* In the case that we have less than two requests
888 * available, check the server limit as a combination
889 * of the request limit and the number of requests
890 * in-flight (the size of the send list). If the
891 * server limit is greater than 2, return busy so
892 * that the last two are reserved for reset and abort.
894 int server_limit = request_status;
895 struct srp_event_struct *tmp_evt;
897 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
901 if (server_limit > 2)
906 /* Copy the IU into the transfer area */
907 *evt_struct->xfer_iu = evt_struct->iu;
908 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
910 /* Add this to the sent list. We need to do this
911 * before we actually send
912 * in case it comes back REALLY fast
914 list_add_tail(&evt_struct->list, &hostdata->sent);
916 init_timer(&evt_struct->timer);
918 evt_struct->timer.data = (unsigned long) evt_struct;
919 evt_struct->timer.expires = jiffies + (timeout * HZ);
920 evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
921 add_timer(&evt_struct->timer);
925 ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
926 list_del(&evt_struct->list);
927 del_timer(&evt_struct->timer);
929 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
930 * Firmware will send a CRQ with a transport event (0xFF) to
931 * tell this client what has happened to the transport. This
932 * will be handled in ibmvscsi_handle_crq()
934 if (rc == H_CLOSED) {
935 dev_warn(hostdata->dev, "send warning. "
936 "Receive queue closed, will retry.\n");
939 dev_err(hostdata->dev, "send error %d\n", rc);
941 atomic_inc(&hostdata->request_limit);
948 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
950 free_event_struct(&hostdata->pool, evt_struct);
951 if (srp_req && request_status != -1)
952 atomic_inc(&hostdata->request_limit);
953 return SCSI_MLQUEUE_HOST_BUSY;
956 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
958 if (evt_struct->cmnd != NULL) {
959 evt_struct->cmnd->result = DID_ERROR << 16;
960 evt_struct->cmnd_done(evt_struct->cmnd);
961 } else if (evt_struct->done)
962 evt_struct->done(evt_struct);
964 free_event_struct(&hostdata->pool, evt_struct);
969 * handle_cmd_rsp: - Handle responses from commands
970 * @evt_struct: srp_event_struct to be handled
972 * Used as a callback by when sending scsi cmds.
973 * Gets called by ibmvscsi_handle_crq()
975 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
977 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
978 struct scsi_cmnd *cmnd = evt_struct->cmnd;
980 if (unlikely(rsp->opcode != SRP_RSP)) {
981 if (printk_ratelimit())
982 dev_warn(evt_struct->hostdata->dev,
983 "bad SRP RSP type %d\n", rsp->opcode);
987 cmnd->result |= rsp->status;
988 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
989 memcpy(cmnd->sense_buffer,
991 rsp->sense_data_len);
992 unmap_cmd_data(&evt_struct->iu.srp.cmd,
994 evt_struct->hostdata->dev);
996 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
997 scsi_set_resid(cmnd, rsp->data_out_res_cnt);
998 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
999 scsi_set_resid(cmnd, rsp->data_in_res_cnt);
1002 if (evt_struct->cmnd_done)
1003 evt_struct->cmnd_done(cmnd);
1007 * lun_from_dev: - Returns the lun of the scsi device
1008 * @dev: struct scsi_device
1011 static inline u16 lun_from_dev(struct scsi_device *dev)
1013 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
1017 * ibmvscsi_queue: - The queuecommand function of the scsi template
1018 * @cmd: struct scsi_cmnd to be executed
1019 * @done: Callback function to be called when cmd is completed
1021 static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
1022 void (*done) (struct scsi_cmnd *))
1024 struct srp_cmd *srp_cmd;
1025 struct srp_event_struct *evt_struct;
1026 struct srp_indirect_buf *indirect;
1027 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
1028 u16 lun = lun_from_dev(cmnd->device);
1031 cmnd->result = (DID_OK << 16);
1032 evt_struct = get_event_struct(&hostdata->pool);
1034 return SCSI_MLQUEUE_HOST_BUSY;
1036 /* Set up the actual SRP IU */
1037 srp_cmd = &evt_struct->iu.srp.cmd;
1038 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
1039 srp_cmd->opcode = SRP_CMD;
1040 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
1041 srp_cmd->lun = ((u64) lun) << 48;
1043 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
1044 if (!firmware_has_feature(FW_FEATURE_CMO))
1045 sdev_printk(KERN_ERR, cmnd->device,
1046 "couldn't convert cmd to srp_cmd\n");
1047 free_event_struct(&hostdata->pool, evt_struct);
1048 return SCSI_MLQUEUE_HOST_BUSY;
1051 init_event_struct(evt_struct,
1054 cmnd->request->timeout/HZ);
1056 evt_struct->cmnd = cmnd;
1057 evt_struct->cmnd_done = done;
1059 /* Fix up dma address of the buffer itself */
1060 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
1061 out_fmt = srp_cmd->buf_fmt >> 4;
1062 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
1063 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
1064 out_fmt == SRP_DATA_DESC_INDIRECT) &&
1065 indirect->table_desc.va == 0) {
1066 indirect->table_desc.va = evt_struct->crq.IU_data_ptr +
1067 offsetof(struct srp_cmd, add_data) +
1068 offsetof(struct srp_indirect_buf, desc_list);
1071 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
1074 static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
1076 /* ------------------------------------------------------------
1077 * Routines for driver initialization
1081 * map_persist_bufs: - Pre-map persistent data for adapter logins
1082 * @hostdata: ibmvscsi_host_data of host
1084 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
1085 * Return 1 on error, 0 on success.
1087 static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
1090 hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
1091 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1093 if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
1094 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
1098 hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
1099 &hostdata->madapter_info,
1100 sizeof(hostdata->madapter_info),
1102 if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
1103 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
1104 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1105 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1113 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
1114 * @hostdata: ibmvscsi_host_data of host
1116 * Unmap the capabilities and adapter info DMA buffers
1118 static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
1120 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1121 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1123 dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
1124 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
1128 * login_rsp: - Handle response to SRP login request
1129 * @evt_struct: srp_event_struct with the response
1131 * Used as a "done" callback by when sending srp_login. Gets called
1132 * by ibmvscsi_handle_crq()
1134 static void login_rsp(struct srp_event_struct *evt_struct)
1136 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1137 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
1138 case SRP_LOGIN_RSP: /* it worked! */
1140 case SRP_LOGIN_REJ: /* refused! */
1141 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
1142 evt_struct->xfer_iu->srp.login_rej.reason);
1144 atomic_set(&hostdata->request_limit, -1);
1147 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
1148 evt_struct->xfer_iu->srp.login_rsp.opcode);
1150 atomic_set(&hostdata->request_limit, -1);
1154 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
1155 hostdata->client_migrated = 0;
1157 /* Now we know what the real request-limit is.
1158 * This value is set rather than added to request_limit because
1159 * request_limit could have been set to -1 by this client.
1161 atomic_set(&hostdata->request_limit,
1162 evt_struct->xfer_iu->srp.login_rsp.req_lim_delta);
1164 /* If we had any pending I/Os, kick them */
1165 scsi_unblock_requests(hostdata->host);
1169 * send_srp_login: - Sends the srp login
1170 * @hostdata: ibmvscsi_host_data of host
1172 * Returns zero if successful.
1174 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
1177 unsigned long flags;
1178 struct srp_login_req *login;
1179 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
1181 BUG_ON(!evt_struct);
1182 init_event_struct(evt_struct, login_rsp,
1183 VIOSRP_SRP_FORMAT, login_timeout);
1185 login = &evt_struct->iu.srp.login_req;
1186 memset(login, 0, sizeof(*login));
1187 login->opcode = SRP_LOGIN_REQ;
1188 login->req_it_iu_len = sizeof(union srp_iu);
1189 login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
1191 spin_lock_irqsave(hostdata->host->host_lock, flags);
1192 /* Start out with a request limit of 0, since this is negotiated in
1193 * the login request we are just sending and login requests always
1194 * get sent by the driver regardless of request_limit.
1196 atomic_set(&hostdata->request_limit, 0);
1198 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
1199 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1200 dev_info(hostdata->dev, "sent SRP login\n");
1205 * capabilities_rsp: - Handle response to MAD adapter capabilities request
1206 * @evt_struct: srp_event_struct with the response
1208 * Used as a "done" callback by when sending adapter_info.
1210 static void capabilities_rsp(struct srp_event_struct *evt_struct)
1212 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1214 if (evt_struct->xfer_iu->mad.capabilities.common.status) {
1215 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
1216 evt_struct->xfer_iu->mad.capabilities.common.status);
1218 if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP)
1219 dev_info(hostdata->dev, "Partition migration not supported\n");
1221 if (client_reserve) {
1222 if (hostdata->caps.reserve.common.server_support ==
1223 SERVER_SUPPORTS_CAP)
1224 dev_info(hostdata->dev, "Client reserve enabled\n");
1226 dev_info(hostdata->dev, "Client reserve not supported\n");
1230 send_srp_login(hostdata);
1234 * send_mad_capabilities: - Sends the mad capabilities request
1235 * and stores the result so it can be retrieved with
1236 * @hostdata: ibmvscsi_host_data of host
1238 static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
1240 struct viosrp_capabilities *req;
1241 struct srp_event_struct *evt_struct;
1242 unsigned long flags;
1243 struct device_node *of_node = hostdata->dev->of_node;
1244 const char *location;
1246 evt_struct = get_event_struct(&hostdata->pool);
1247 BUG_ON(!evt_struct);
1249 init_event_struct(evt_struct, capabilities_rsp,
1250 VIOSRP_MAD_FORMAT, info_timeout);
1252 req = &evt_struct->iu.mad.capabilities;
1253 memset(req, 0, sizeof(*req));
1255 hostdata->caps.flags = CAP_LIST_SUPPORTED;
1256 if (hostdata->client_migrated)
1257 hostdata->caps.flags |= CLIENT_MIGRATED;
1259 strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
1260 sizeof(hostdata->caps.name));
1261 hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0';
1263 location = of_get_property(of_node, "ibm,loc-code", NULL);
1264 location = location ? location : dev_name(hostdata->dev);
1265 strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
1266 hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0';
1268 req->common.type = VIOSRP_CAPABILITIES_TYPE;
1269 req->buffer = hostdata->caps_addr;
1271 hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES;
1272 hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration);
1273 hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP;
1274 hostdata->caps.migration.ecl = 1;
1276 if (client_reserve) {
1277 hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES;
1278 hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve);
1279 hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP;
1280 hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2;
1281 req->common.length = sizeof(hostdata->caps);
1283 req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve);
1285 spin_lock_irqsave(hostdata->host->host_lock, flags);
1286 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1287 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
1288 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1292 * fast_fail_rsp: - Handle response to MAD enable fast fail
1293 * @evt_struct: srp_event_struct with the response
1295 * Used as a "done" callback by when sending enable fast fail. Gets called
1296 * by ibmvscsi_handle_crq()
1298 static void fast_fail_rsp(struct srp_event_struct *evt_struct)
1300 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1301 u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status;
1303 if (status == VIOSRP_MAD_NOT_SUPPORTED)
1304 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1305 else if (status == VIOSRP_MAD_FAILED)
1306 dev_err(hostdata->dev, "fast_fail request failed\n");
1307 else if (status != VIOSRP_MAD_SUCCESS)
1308 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1310 send_mad_capabilities(hostdata);
1314 * init_host - Start host initialization
1315 * @hostdata: ibmvscsi_host_data of host
1317 * Returns zero if successful.
1319 static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1322 unsigned long flags;
1323 struct viosrp_fast_fail *fast_fail_mad;
1324 struct srp_event_struct *evt_struct;
1327 send_mad_capabilities(hostdata);
1331 evt_struct = get_event_struct(&hostdata->pool);
1332 BUG_ON(!evt_struct);
1334 init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1336 fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1337 memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1338 fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL;
1339 fast_fail_mad->common.length = sizeof(*fast_fail_mad);
1341 spin_lock_irqsave(hostdata->host->host_lock, flags);
1342 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1343 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1348 * adapter_info_rsp: - Handle response to MAD adapter info request
1349 * @evt_struct: srp_event_struct with the response
1351 * Used as a "done" callback by when sending adapter_info. Gets called
1352 * by ibmvscsi_handle_crq()
1354 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1356 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1358 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1359 dev_err(hostdata->dev, "error %d getting adapter info\n",
1360 evt_struct->xfer_iu->mad.adapter_info.common.status);
1362 dev_info(hostdata->dev, "host srp version: %s, "
1363 "host partition %s (%d), OS %d, max io %u\n",
1364 hostdata->madapter_info.srp_version,
1365 hostdata->madapter_info.partition_name,
1366 hostdata->madapter_info.partition_number,
1367 hostdata->madapter_info.os_type,
1368 hostdata->madapter_info.port_max_txu[0]);
1370 if (hostdata->madapter_info.port_max_txu[0])
1371 hostdata->host->max_sectors =
1372 hostdata->madapter_info.port_max_txu[0] >> 9;
1374 if (hostdata->madapter_info.os_type == 3 &&
1375 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1376 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1377 hostdata->madapter_info.srp_version);
1378 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1380 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1383 if (hostdata->madapter_info.os_type == 3) {
1384 enable_fast_fail(hostdata);
1389 send_srp_login(hostdata);
1393 * send_mad_adapter_info: - Sends the mad adapter info request
1394 * and stores the result so it can be retrieved with
1395 * sysfs. We COULD consider causing a failure if the
1396 * returned SRP version doesn't match ours.
1397 * @hostdata: ibmvscsi_host_data of host
1399 * Returns zero if successful.
1401 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1403 struct viosrp_adapter_info *req;
1404 struct srp_event_struct *evt_struct;
1405 unsigned long flags;
1407 evt_struct = get_event_struct(&hostdata->pool);
1408 BUG_ON(!evt_struct);
1410 init_event_struct(evt_struct,
1415 req = &evt_struct->iu.mad.adapter_info;
1416 memset(req, 0x00, sizeof(*req));
1418 req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
1419 req->common.length = sizeof(hostdata->madapter_info);
1420 req->buffer = hostdata->adapter_info_addr;
1422 spin_lock_irqsave(hostdata->host->host_lock, flags);
1423 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1424 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1425 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1429 * init_adapter: Start virtual adapter initialization sequence
1432 static void init_adapter(struct ibmvscsi_host_data *hostdata)
1434 send_mad_adapter_info(hostdata);
1438 * sync_completion: Signal that a synchronous command has completed
1439 * Note that after returning from this call, the evt_struct is freed.
1440 * the caller waiting on this completion shouldn't touch the evt_struct
1443 static void sync_completion(struct srp_event_struct *evt_struct)
1445 /* copy the response back */
1446 if (evt_struct->sync_srp)
1447 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1449 complete(&evt_struct->comp);
1453 * ibmvscsi_abort: Abort a command...from scsi host template
1454 * send this over to the server and wait synchronously for the response
1456 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1458 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1459 struct srp_tsk_mgmt *tsk_mgmt;
1460 struct srp_event_struct *evt;
1461 struct srp_event_struct *tmp_evt, *found_evt;
1462 union viosrp_iu srp_rsp;
1464 unsigned long flags;
1465 u16 lun = lun_from_dev(cmd->device);
1466 unsigned long wait_switch = 0;
1468 /* First, find this command in our sent list so we can figure
1469 * out the correct tag
1471 spin_lock_irqsave(hostdata->host->host_lock, flags);
1472 wait_switch = jiffies + (init_timeout * HZ);
1475 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1476 if (tmp_evt->cmnd == cmd) {
1477 found_evt = tmp_evt;
1483 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1487 evt = get_event_struct(&hostdata->pool);
1489 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1490 sdev_printk(KERN_ERR, cmd->device,
1491 "failed to allocate abort event\n");
1495 init_event_struct(evt,
1500 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1502 /* Set up an abort SRP command */
1503 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1504 tsk_mgmt->opcode = SRP_TSK_MGMT;
1505 tsk_mgmt->lun = ((u64) lun) << 48;
1506 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1507 tsk_mgmt->task_tag = (u64) found_evt;
1509 evt->sync_srp = &srp_rsp;
1511 init_completion(&evt->comp);
1512 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1514 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1517 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1519 spin_lock_irqsave(hostdata->host->host_lock, flags);
1520 } while (time_before(jiffies, wait_switch));
1522 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1525 sdev_printk(KERN_ERR, cmd->device,
1526 "failed to send abort() event. rc=%d\n", rsp_rc);
1530 sdev_printk(KERN_INFO, cmd->device,
1531 "aborting command. lun 0x%llx, tag 0x%llx\n",
1532 (((u64) lun) << 48), (u64) found_evt);
1534 wait_for_completion(&evt->comp);
1536 /* make sure we got a good response */
1537 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1538 if (printk_ratelimit())
1539 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1540 srp_rsp.srp.rsp.opcode);
1544 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1545 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1547 rsp_rc = srp_rsp.srp.rsp.status;
1550 if (printk_ratelimit())
1551 sdev_printk(KERN_WARNING, cmd->device,
1552 "abort code %d for task tag 0x%llx\n",
1553 rsp_rc, tsk_mgmt->task_tag);
1557 /* Because we dropped the spinlock above, it's possible
1558 * The event is no longer in our list. Make sure it didn't
1559 * complete while we were aborting
1561 spin_lock_irqsave(hostdata->host->host_lock, flags);
1563 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1564 if (tmp_evt->cmnd == cmd) {
1565 found_evt = tmp_evt;
1570 if (found_evt == NULL) {
1571 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1572 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1573 tsk_mgmt->task_tag);
1577 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1578 tsk_mgmt->task_tag);
1580 cmd->result = (DID_ABORT << 16);
1581 list_del(&found_evt->list);
1582 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1583 found_evt->hostdata->dev);
1584 free_event_struct(&found_evt->hostdata->pool, found_evt);
1585 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1586 atomic_inc(&hostdata->request_limit);
1591 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1592 * template send this over to the server and wait synchronously for the
1595 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1597 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1598 struct srp_tsk_mgmt *tsk_mgmt;
1599 struct srp_event_struct *evt;
1600 struct srp_event_struct *tmp_evt, *pos;
1601 union viosrp_iu srp_rsp;
1603 unsigned long flags;
1604 u16 lun = lun_from_dev(cmd->device);
1605 unsigned long wait_switch = 0;
1607 spin_lock_irqsave(hostdata->host->host_lock, flags);
1608 wait_switch = jiffies + (init_timeout * HZ);
1610 evt = get_event_struct(&hostdata->pool);
1612 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1613 sdev_printk(KERN_ERR, cmd->device,
1614 "failed to allocate reset event\n");
1618 init_event_struct(evt,
1623 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1625 /* Set up a lun reset SRP command */
1626 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1627 tsk_mgmt->opcode = SRP_TSK_MGMT;
1628 tsk_mgmt->lun = ((u64) lun) << 48;
1629 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1631 evt->sync_srp = &srp_rsp;
1633 init_completion(&evt->comp);
1634 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1636 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1639 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1641 spin_lock_irqsave(hostdata->host->host_lock, flags);
1642 } while (time_before(jiffies, wait_switch));
1644 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1647 sdev_printk(KERN_ERR, cmd->device,
1648 "failed to send reset event. rc=%d\n", rsp_rc);
1652 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1653 (((u64) lun) << 48));
1655 wait_for_completion(&evt->comp);
1657 /* make sure we got a good response */
1658 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1659 if (printk_ratelimit())
1660 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1661 srp_rsp.srp.rsp.opcode);
1665 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1666 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1668 rsp_rc = srp_rsp.srp.rsp.status;
1671 if (printk_ratelimit())
1672 sdev_printk(KERN_WARNING, cmd->device,
1673 "reset code %d for task tag 0x%llx\n",
1674 rsp_rc, tsk_mgmt->task_tag);
1678 /* We need to find all commands for this LUN that have not yet been
1679 * responded to, and fail them with DID_RESET
1681 spin_lock_irqsave(hostdata->host->host_lock, flags);
1682 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1683 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1685 tmp_evt->cmnd->result = (DID_RESET << 16);
1686 list_del(&tmp_evt->list);
1687 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1688 tmp_evt->hostdata->dev);
1689 free_event_struct(&tmp_evt->hostdata->pool,
1691 atomic_inc(&hostdata->request_limit);
1692 if (tmp_evt->cmnd_done)
1693 tmp_evt->cmnd_done(tmp_evt->cmnd);
1694 else if (tmp_evt->done)
1695 tmp_evt->done(tmp_evt);
1698 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1703 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1704 * @cmd: struct scsi_cmnd having problems
1706 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1708 unsigned long wait_switch = 0;
1709 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1711 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1713 ibmvscsi_reset_host(hostdata);
1715 for (wait_switch = jiffies + (init_timeout * HZ);
1716 time_before(jiffies, wait_switch) &&
1717 atomic_read(&hostdata->request_limit) < 2;) {
1722 if (atomic_read(&hostdata->request_limit) <= 0)
1729 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1730 * @crq: Command/Response queue
1731 * @hostdata: ibmvscsi_host_data of host
1734 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1735 struct ibmvscsi_host_data *hostdata)
1738 unsigned long flags;
1739 struct srp_event_struct *evt_struct =
1740 (struct srp_event_struct *)crq->IU_data_ptr;
1741 switch (crq->valid) {
1742 case 0xC0: /* initialization */
1743 switch (crq->format) {
1744 case 0x01: /* Initialization message */
1745 dev_info(hostdata->dev, "partner initialized\n");
1746 /* Send back a response */
1747 rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
1750 init_adapter(hostdata);
1752 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1756 case 0x02: /* Initialization response */
1757 dev_info(hostdata->dev, "partner initialization complete\n");
1760 init_adapter(hostdata);
1763 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1766 case 0xFF: /* Hypervisor telling us the connection is closed */
1767 scsi_block_requests(hostdata->host);
1768 atomic_set(&hostdata->request_limit, 0);
1769 if (crq->format == 0x06) {
1770 /* We need to re-setup the interpartition connection */
1771 dev_info(hostdata->dev, "Re-enabling adapter!\n");
1772 hostdata->client_migrated = 1;
1773 hostdata->reenable_crq = 1;
1774 purge_requests(hostdata, DID_REQUEUE);
1775 wake_up(&hostdata->work_wait_q);
1777 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1779 ibmvscsi_reset_host(hostdata);
1782 case 0x80: /* real payload */
1785 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1790 /* The only kind of payload CRQs we should get are responses to
1791 * things we send. Make sure this response is to something we
1794 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1795 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1796 (void *)crq->IU_data_ptr);
1800 if (atomic_read(&evt_struct->free)) {
1801 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1802 (void *)crq->IU_data_ptr);
1806 if (crq->format == VIOSRP_SRP_FORMAT)
1807 atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta,
1808 &hostdata->request_limit);
1810 del_timer(&evt_struct->timer);
1812 if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1813 evt_struct->cmnd->result = DID_ERROR << 16;
1814 if (evt_struct->done)
1815 evt_struct->done(evt_struct);
1817 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1820 * Lock the host_lock before messing with these structures, since we
1821 * are running in a task context
1823 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1824 list_del(&evt_struct->list);
1825 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1826 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1830 * ibmvscsi_get_host_config: Send the command to the server to get host
1831 * configuration data. The data is opaque to us.
1833 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1834 unsigned char *buffer, int length)
1836 struct viosrp_host_config *host_config;
1837 struct srp_event_struct *evt_struct;
1838 unsigned long flags;
1842 evt_struct = get_event_struct(&hostdata->pool);
1844 dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n");
1848 init_event_struct(evt_struct,
1853 host_config = &evt_struct->iu.mad.host_config;
1855 /* The transport length field is only 16-bit */
1856 length = min(0xffff, length);
1858 /* Set up a lun reset SRP command */
1859 memset(host_config, 0x00, sizeof(*host_config));
1860 host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1861 host_config->common.length = length;
1862 host_config->buffer = addr = dma_map_single(hostdata->dev, buffer,
1866 if (dma_mapping_error(hostdata->dev, host_config->buffer)) {
1867 if (!firmware_has_feature(FW_FEATURE_CMO))
1868 dev_err(hostdata->dev,
1869 "dma_mapping error getting host config\n");
1870 free_event_struct(&hostdata->pool, evt_struct);
1874 init_completion(&evt_struct->comp);
1875 spin_lock_irqsave(hostdata->host->host_lock, flags);
1876 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1877 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1879 wait_for_completion(&evt_struct->comp);
1880 dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);
1886 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1887 * @sdev: struct scsi_device device to configure
1889 * Enable allow_restart for a device if it is a disk. Adjust the
1890 * queue_depth here also as is required by the documentation for
1891 * struct scsi_host_template.
1893 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1895 struct Scsi_Host *shost = sdev->host;
1896 unsigned long lock_flags = 0;
1898 spin_lock_irqsave(shost->host_lock, lock_flags);
1899 if (sdev->type == TYPE_DISK) {
1900 sdev->allow_restart = 1;
1901 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1903 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1904 scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun);
1909 * ibmvscsi_change_queue_depth - Change the device's queue depth
1910 * @sdev: scsi device struct
1911 * @qdepth: depth to set
1912 * @reason: calling context
1917 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth,
1920 if (reason != SCSI_QDEPTH_DEFAULT)
1923 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1924 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1926 scsi_adjust_queue_depth(sdev, 0, qdepth);
1927 return sdev->queue_depth;
1930 /* ------------------------------------------------------------
1933 static ssize_t show_host_vhost_loc(struct device *dev,
1934 struct device_attribute *attr, char *buf)
1936 struct Scsi_Host *shost = class_to_shost(dev);
1937 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1940 len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1941 hostdata->caps.loc);
1945 static struct device_attribute ibmvscsi_host_vhost_loc = {
1947 .name = "vhost_loc",
1950 .show = show_host_vhost_loc,
1953 static ssize_t show_host_vhost_name(struct device *dev,
1954 struct device_attribute *attr, char *buf)
1956 struct Scsi_Host *shost = class_to_shost(dev);
1957 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1960 len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1961 hostdata->caps.name);
1965 static struct device_attribute ibmvscsi_host_vhost_name = {
1967 .name = "vhost_name",
1970 .show = show_host_vhost_name,
1973 static ssize_t show_host_srp_version(struct device *dev,
1974 struct device_attribute *attr, char *buf)
1976 struct Scsi_Host *shost = class_to_shost(dev);
1977 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1980 len = snprintf(buf, PAGE_SIZE, "%s\n",
1981 hostdata->madapter_info.srp_version);
1985 static struct device_attribute ibmvscsi_host_srp_version = {
1987 .name = "srp_version",
1990 .show = show_host_srp_version,
1993 static ssize_t show_host_partition_name(struct device *dev,
1994 struct device_attribute *attr,
1997 struct Scsi_Host *shost = class_to_shost(dev);
1998 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2001 len = snprintf(buf, PAGE_SIZE, "%s\n",
2002 hostdata->madapter_info.partition_name);
2006 static struct device_attribute ibmvscsi_host_partition_name = {
2008 .name = "partition_name",
2011 .show = show_host_partition_name,
2014 static ssize_t show_host_partition_number(struct device *dev,
2015 struct device_attribute *attr,
2018 struct Scsi_Host *shost = class_to_shost(dev);
2019 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2022 len = snprintf(buf, PAGE_SIZE, "%d\n",
2023 hostdata->madapter_info.partition_number);
2027 static struct device_attribute ibmvscsi_host_partition_number = {
2029 .name = "partition_number",
2032 .show = show_host_partition_number,
2035 static ssize_t show_host_mad_version(struct device *dev,
2036 struct device_attribute *attr, char *buf)
2038 struct Scsi_Host *shost = class_to_shost(dev);
2039 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2042 len = snprintf(buf, PAGE_SIZE, "%d\n",
2043 hostdata->madapter_info.mad_version);
2047 static struct device_attribute ibmvscsi_host_mad_version = {
2049 .name = "mad_version",
2052 .show = show_host_mad_version,
2055 static ssize_t show_host_os_type(struct device *dev,
2056 struct device_attribute *attr, char *buf)
2058 struct Scsi_Host *shost = class_to_shost(dev);
2059 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2062 len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
2066 static struct device_attribute ibmvscsi_host_os_type = {
2071 .show = show_host_os_type,
2074 static ssize_t show_host_config(struct device *dev,
2075 struct device_attribute *attr, char *buf)
2077 struct Scsi_Host *shost = class_to_shost(dev);
2078 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2080 /* returns null-terminated host config data */
2081 if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
2087 static struct device_attribute ibmvscsi_host_config = {
2092 .show = show_host_config,
2095 static struct device_attribute *ibmvscsi_attrs[] = {
2096 &ibmvscsi_host_vhost_loc,
2097 &ibmvscsi_host_vhost_name,
2098 &ibmvscsi_host_srp_version,
2099 &ibmvscsi_host_partition_name,
2100 &ibmvscsi_host_partition_number,
2101 &ibmvscsi_host_mad_version,
2102 &ibmvscsi_host_os_type,
2103 &ibmvscsi_host_config,
2107 /* ------------------------------------------------------------
2108 * SCSI driver registration
2110 static struct scsi_host_template driver_template = {
2111 .module = THIS_MODULE,
2112 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
2113 .proc_name = "ibmvscsi",
2114 .queuecommand = ibmvscsi_queuecommand,
2115 .eh_abort_handler = ibmvscsi_eh_abort_handler,
2116 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
2117 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
2118 .slave_configure = ibmvscsi_slave_configure,
2119 .change_queue_depth = ibmvscsi_change_queue_depth,
2120 .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
2121 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
2123 .sg_tablesize = SG_ALL,
2124 .use_clustering = ENABLE_CLUSTERING,
2125 .shost_attrs = ibmvscsi_attrs,
2129 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
2131 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
2134 * Number of bytes of IO data the driver will need to perform well.
2136 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
2138 /* iu_storage data allocated in initialize_event_pool */
2139 unsigned long desired_io = max_events * sizeof(union viosrp_iu);
2141 /* add io space for sg data */
2142 desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
2143 IBMVSCSI_CMDS_PER_LUN_DEFAULT);
2148 static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
2151 char *action = "reset";
2153 if (hostdata->reset_crq) {
2155 hostdata->reset_crq = 0;
2157 rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
2159 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2160 vio_enable_interrupts(to_vio_dev(hostdata->dev));
2161 } else if (hostdata->reenable_crq) {
2164 rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
2165 hostdata->reenable_crq = 0;
2167 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2172 atomic_set(&hostdata->request_limit, -1);
2173 dev_err(hostdata->dev, "error after %s\n", action);
2176 scsi_unblock_requests(hostdata->host);
2179 static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2181 if (kthread_should_stop())
2183 else if (hostdata->reset_crq) {
2186 } else if (hostdata->reenable_crq) {
2194 static int ibmvscsi_work(void *data)
2196 struct ibmvscsi_host_data *hostdata = data;
2199 set_user_nice(current, -20);
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 atomic_set(&hostdata->request_limit, -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;
2272 host->max_id = max_id;
2273 host->max_channel = max_channel;
2274 host->max_cmd_len = 16;
2276 if (scsi_add_host(hostdata->host, hostdata->dev))
2277 goto add_host_failed;
2279 /* we don't have a proper target_port_id so let's use the fake one */
2280 memcpy(ids.port_id, hostdata->madapter_info.partition_name,
2281 sizeof(ids.port_id));
2282 ids.roles = SRP_RPORT_ROLE_TARGET;
2283 rport = srp_rport_add(host, &ids);
2285 goto add_srp_port_failed;
2287 /* Try to send an initialization message. Note that this is allowed
2288 * to fail if the other end is not acive. In that case we don't
2291 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
2292 || rc == H_RESOURCE) {
2294 * Wait around max init_timeout secs for the adapter to finish
2295 * initializing. When we are done initializing, we will have a
2296 * valid request_limit. We don't want Linux scanning before
2299 for (wait_switch = jiffies + (init_timeout * HZ);
2300 time_before(jiffies, wait_switch) &&
2301 atomic_read(&hostdata->request_limit) < 2;) {
2306 /* if we now have a valid request_limit, initiate a scan */
2307 if (atomic_read(&hostdata->request_limit) > 0)
2308 scsi_scan_host(host);
2311 dev_set_drvdata(&vdev->dev, hostdata);
2314 add_srp_port_failed:
2315 scsi_remove_host(hostdata->host);
2317 release_event_pool(&hostdata->pool, hostdata);
2319 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
2321 kthread_stop(hostdata->work_thread);
2323 unmap_persist_bufs(hostdata);
2324 persist_bufs_failed:
2325 scsi_host_put(host);
2326 scsi_host_alloc_failed:
2330 static int ibmvscsi_remove(struct vio_dev *vdev)
2332 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2333 unmap_persist_bufs(hostdata);
2334 release_event_pool(&hostdata->pool, hostdata);
2335 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
2338 kthread_stop(hostdata->work_thread);
2339 srp_remove_host(hostdata->host);
2340 scsi_remove_host(hostdata->host);
2341 scsi_host_put(hostdata->host);
2347 * ibmvscsi_resume: Resume from suspend
2348 * @dev: device struct
2350 * We may have lost an interrupt across suspend/resume, so kick the
2353 static int ibmvscsi_resume(struct device *dev)
2355 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2356 vio_disable_interrupts(to_vio_dev(hostdata->dev));
2357 tasklet_schedule(&hostdata->srp_task);
2363 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
2366 static struct vio_device_id ibmvscsi_device_table[] = {
2367 {"vscsi", "IBM,v-scsi"},
2370 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2372 static struct dev_pm_ops ibmvscsi_pm_ops = {
2373 .resume = ibmvscsi_resume
2376 static struct vio_driver ibmvscsi_driver = {
2377 .id_table = ibmvscsi_device_table,
2378 .probe = ibmvscsi_probe,
2379 .remove = ibmvscsi_remove,
2380 .get_desired_dma = ibmvscsi_get_desired_dma,
2382 .pm = &ibmvscsi_pm_ops,
2385 static struct srp_function_template ibmvscsi_transport_functions = {
2388 int __init ibmvscsi_module_init(void)
2392 /* Ensure we have two requests to do error recovery */
2393 driver_template.can_queue = max_requests;
2394 max_events = max_requests + 2;
2396 if (!firmware_has_feature(FW_FEATURE_VIO))
2399 ibmvscsi_transport_template =
2400 srp_attach_transport(&ibmvscsi_transport_functions);
2401 if (!ibmvscsi_transport_template)
2404 ret = vio_register_driver(&ibmvscsi_driver);
2406 srp_release_transport(ibmvscsi_transport_template);
2410 void __exit ibmvscsi_module_exit(void)
2412 vio_unregister_driver(&ibmvscsi_driver);
2413 srp_release_transport(ibmvscsi_transport_template);
2416 module_init(ibmvscsi_module_init);
2417 module_exit(ibmvscsi_module_exit);