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[96] = "UNKNOWN";
97 static unsigned int partition_number = -1;
98 static LIST_HEAD(ibmvscsi_head);
99 static DEFINE_SPINLOCK(ibmvscsi_driver_lock);
101 static struct scsi_transport_template *ibmvscsi_transport_template;
103 #define IBMVSCSI_VERSION "1.5.9"
105 MODULE_DESCRIPTION("IBM Virtual SCSI");
106 MODULE_AUTHOR("Dave Boutcher");
107 MODULE_LICENSE("GPL");
108 MODULE_VERSION(IBMVSCSI_VERSION);
110 module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
111 MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]");
112 module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
113 MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]");
114 module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
115 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
116 module_param_named(max_requests, max_requests, int, S_IRUGO);
117 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
118 module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
119 MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
120 module_param_named(client_reserve, client_reserve, int, S_IRUGO );
121 MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
123 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
124 struct ibmvscsi_host_data *hostdata);
126 /* ------------------------------------------------------------
127 * Routines for managing the command/response queue
130 * ibmvscsi_handle_event: - Interrupt handler for crq events
131 * @irq: number of irq to handle, not used
132 * @dev_instance: ibmvscsi_host_data of host that received interrupt
134 * Disables interrupts and schedules srp_task
135 * Always returns IRQ_HANDLED
137 static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
139 struct ibmvscsi_host_data *hostdata =
140 (struct ibmvscsi_host_data *)dev_instance;
141 vio_disable_interrupts(to_vio_dev(hostdata->dev));
142 tasklet_schedule(&hostdata->srp_task);
147 * release_crq_queue: - Deallocates data and unregisters CRQ
148 * @queue: crq_queue to initialize and register
149 * @host_data: ibmvscsi_host_data of host
151 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
152 * the crq with the hypervisor.
154 static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
155 struct ibmvscsi_host_data *hostdata,
159 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
160 free_irq(vdev->irq, (void *)hostdata);
161 tasklet_kill(&hostdata->srp_task);
165 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
166 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
167 dma_unmap_single(hostdata->dev,
169 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
170 free_page((unsigned long)queue->msgs);
174 * crq_queue_next_crq: - Returns the next entry in message queue
175 * @queue: crq_queue to use
177 * Returns pointer to next entry in queue, or NULL if there are no new
178 * entried in the CRQ.
180 static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
182 struct viosrp_crq *crq;
185 spin_lock_irqsave(&queue->lock, flags);
186 crq = &queue->msgs[queue->cur];
187 if (crq->valid != VIOSRP_CRQ_FREE) {
188 if (++queue->cur == queue->size)
191 /* Ensure the read of the valid bit occurs before reading any
192 * other bits of the CRQ entry
197 spin_unlock_irqrestore(&queue->lock, flags);
203 * ibmvscsi_send_crq: - Send a CRQ
204 * @hostdata: the adapter
205 * @word1: the first 64 bits of the data
206 * @word2: the second 64 bits of the data
208 static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
209 u64 word1, u64 word2)
211 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
214 * Ensure the command buffer is flushed to memory before handing it
215 * over to the VIOS to prevent it from fetching any stale data.
218 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
222 * ibmvscsi_task: - Process srps asynchronously
223 * @data: ibmvscsi_host_data of host
225 static void ibmvscsi_task(void *data)
227 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
228 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
229 struct viosrp_crq *crq;
233 /* Pull all the valid messages off the CRQ */
234 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
235 ibmvscsi_handle_crq(crq, hostdata);
236 crq->valid = VIOSRP_CRQ_FREE;
240 vio_enable_interrupts(vdev);
241 crq = crq_queue_next_crq(&hostdata->queue);
243 vio_disable_interrupts(vdev);
244 ibmvscsi_handle_crq(crq, hostdata);
245 crq->valid = VIOSRP_CRQ_FREE;
253 static void gather_partition_info(void)
255 const char *ppartition_name;
256 const __be32 *p_number_ptr;
258 /* Retrieve information about this partition */
262 of_node_get(of_root);
264 ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);
266 strlcpy(partition_name, ppartition_name,
267 sizeof(partition_name));
268 p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);
270 partition_number = of_read_number(p_number_ptr, 1);
271 of_node_put(of_root);
274 static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
276 memset(&hostdata->madapter_info, 0x00,
277 sizeof(hostdata->madapter_info));
279 dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
280 strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
282 strncpy(hostdata->madapter_info.partition_name, partition_name,
283 sizeof(hostdata->madapter_info.partition_name));
285 hostdata->madapter_info.partition_number =
286 cpu_to_be32(partition_number);
288 hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1);
289 hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX);
293 * reset_crq_queue: - resets a crq after a failure
294 * @queue: crq_queue to initialize and register
295 * @hostdata: ibmvscsi_host_data of host
298 static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
299 struct ibmvscsi_host_data *hostdata)
302 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
308 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
309 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
311 /* Clean out the queue */
312 memset(queue->msgs, 0x00, PAGE_SIZE);
315 set_adapter_info(hostdata);
317 /* And re-open it again */
318 rc = plpar_hcall_norets(H_REG_CRQ,
320 queue->msg_token, PAGE_SIZE);
321 if (rc == H_CLOSED) {
322 /* Adapter is good, but other end is not ready */
323 dev_warn(hostdata->dev, "Partner adapter not ready\n");
324 } else if (rc != 0) {
325 dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
331 * initialize_crq_queue: - Initializes and registers CRQ with hypervisor
332 * @queue: crq_queue to initialize and register
333 * @hostdata: ibmvscsi_host_data of host
335 * Allocates a page for messages, maps it for dma, and registers
336 * the crq with the hypervisor.
337 * Returns zero on success.
339 static int ibmvscsi_init_crq_queue(struct crq_queue *queue,
340 struct ibmvscsi_host_data *hostdata,
345 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
347 queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
351 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
353 queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
354 queue->size * sizeof(*queue->msgs),
357 if (dma_mapping_error(hostdata->dev, queue->msg_token))
360 gather_partition_info();
361 set_adapter_info(hostdata);
363 retrc = rc = plpar_hcall_norets(H_REG_CRQ,
365 queue->msg_token, PAGE_SIZE);
366 if (rc == H_RESOURCE)
367 /* maybe kexecing and resource is busy. try a reset */
368 rc = ibmvscsi_reset_crq_queue(queue,
371 if (rc == H_CLOSED) {
372 /* Adapter is good, but other end is not ready */
373 dev_warn(hostdata->dev, "Partner adapter not ready\n");
375 } else if (rc != 0) {
376 dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
381 spin_lock_init(&queue->lock);
383 tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
384 (unsigned long)hostdata);
386 if (request_irq(vdev->irq,
387 ibmvscsi_handle_event,
388 0, "ibmvscsi", (void *)hostdata) != 0) {
389 dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
394 rc = vio_enable_interrupts(vdev);
396 dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
403 tasklet_kill(&hostdata->srp_task);
408 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
409 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
411 dma_unmap_single(hostdata->dev,
413 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
415 free_page((unsigned long)queue->msgs);
421 * reenable_crq_queue: - reenables a crq after
422 * @queue: crq_queue to initialize and register
423 * @hostdata: ibmvscsi_host_data of host
426 static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
427 struct ibmvscsi_host_data *hostdata)
430 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
432 set_adapter_info(hostdata);
434 /* Re-enable the CRQ */
438 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
439 } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
442 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
446 /* ------------------------------------------------------------
447 * Routines for the event pool and event structs
450 * initialize_event_pool: - Allocates and initializes the event pool for a host
451 * @pool: event_pool to be initialized
452 * @size: Number of events in pool
453 * @hostdata: ibmvscsi_host_data who owns the event pool
455 * Returns zero on success.
457 static int initialize_event_pool(struct event_pool *pool,
458 int size, struct ibmvscsi_host_data *hostdata)
464 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
469 dma_alloc_coherent(hostdata->dev,
470 pool->size * sizeof(*pool->iu_storage),
472 if (!pool->iu_storage) {
477 for (i = 0; i < pool->size; ++i) {
478 struct srp_event_struct *evt = &pool->events[i];
479 memset(&evt->crq, 0x00, sizeof(evt->crq));
480 atomic_set(&evt->free, 1);
481 evt->crq.valid = VIOSRP_CRQ_CMD_RSP;
482 evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));
483 evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +
484 sizeof(*evt->xfer_iu) * i);
485 evt->xfer_iu = pool->iu_storage + i;
486 evt->hostdata = hostdata;
487 evt->ext_list = NULL;
488 evt->ext_list_token = 0;
495 * release_event_pool: - Frees memory of an event pool of a host
496 * @pool: event_pool to be released
497 * @hostdata: ibmvscsi_host_data who owns the even pool
499 * Returns zero on success.
501 static void release_event_pool(struct event_pool *pool,
502 struct ibmvscsi_host_data *hostdata)
505 for (i = 0; i < pool->size; ++i) {
506 if (atomic_read(&pool->events[i].free) != 1)
508 if (pool->events[i].ext_list) {
509 dma_free_coherent(hostdata->dev,
510 SG_ALL * sizeof(struct srp_direct_buf),
511 pool->events[i].ext_list,
512 pool->events[i].ext_list_token);
516 dev_warn(hostdata->dev, "releasing event pool with %d "
517 "events still in use?\n", in_use);
519 dma_free_coherent(hostdata->dev,
520 pool->size * sizeof(*pool->iu_storage),
521 pool->iu_storage, pool->iu_token);
525 * valid_event_struct: - Determines if event is valid.
526 * @pool: event_pool that contains the event
527 * @evt: srp_event_struct to be checked for validity
529 * Returns zero if event is invalid, one otherwise.
531 static int valid_event_struct(struct event_pool *pool,
532 struct srp_event_struct *evt)
534 int index = evt - pool->events;
535 if (index < 0 || index >= pool->size) /* outside of bounds */
537 if (evt != pool->events + index) /* unaligned */
543 * ibmvscsi_free-event_struct: - Changes status of event to "free"
544 * @pool: event_pool that contains the event
545 * @evt: srp_event_struct to be modified
548 static void free_event_struct(struct event_pool *pool,
549 struct srp_event_struct *evt)
551 if (!valid_event_struct(pool, evt)) {
552 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
553 "(not in pool %p)\n", evt, pool->events);
556 if (atomic_inc_return(&evt->free) != 1) {
557 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
558 "which is not in use!\n", evt);
564 * get_evt_struct: - Gets the next free event in pool
565 * @pool: event_pool that contains the events to be searched
567 * Returns the next event in "free" state, and NULL if none are free.
568 * Note that no synchronization is done here, we assume the host_lock
569 * will syncrhonze things.
571 static struct srp_event_struct *get_event_struct(struct event_pool *pool)
574 int poolsize = pool->size;
575 int offset = pool->next;
577 for (i = 0; i < poolsize; i++) {
578 offset = (offset + 1) % poolsize;
579 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
581 return &pool->events[offset];
585 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
590 * init_event_struct: Initialize fields in an event struct that are always
593 * @done: Routine to call when the event is responded to
594 * @format: SRP or MAD format
595 * @timeout: timeout value set in the CRQ
597 static void init_event_struct(struct srp_event_struct *evt_struct,
598 void (*done) (struct srp_event_struct *),
602 evt_struct->cmnd = NULL;
603 evt_struct->cmnd_done = NULL;
604 evt_struct->sync_srp = NULL;
605 evt_struct->crq.format = format;
606 evt_struct->crq.timeout = cpu_to_be16(timeout);
607 evt_struct->done = done;
610 /* ------------------------------------------------------------
611 * Routines for receiving SCSI responses from the hosting partition
615 * set_srp_direction: Set the fields in the srp related to data
616 * direction and number of buffers based on the direction in
617 * the scsi_cmnd and the number of buffers
619 static void set_srp_direction(struct scsi_cmnd *cmd,
620 struct srp_cmd *srp_cmd,
629 fmt = SRP_DATA_DESC_DIRECT;
631 fmt = SRP_DATA_DESC_INDIRECT;
632 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
634 if (cmd->sc_data_direction == DMA_TO_DEVICE)
635 srp_cmd->data_out_desc_cnt = numbuf;
637 srp_cmd->data_in_desc_cnt = numbuf;
640 if (cmd->sc_data_direction == DMA_TO_DEVICE)
641 srp_cmd->buf_fmt = fmt << 4;
643 srp_cmd->buf_fmt = fmt;
647 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
648 * @cmd: srp_cmd whose additional_data member will be unmapped
649 * @dev: device for which the memory is mapped
652 static void unmap_cmd_data(struct srp_cmd *cmd,
653 struct srp_event_struct *evt_struct,
658 out_fmt = cmd->buf_fmt >> 4;
659 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
661 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
664 if (evt_struct->cmnd)
665 scsi_dma_unmap(evt_struct->cmnd);
668 static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
669 struct srp_direct_buf *md)
672 struct scatterlist *sg;
673 u64 total_length = 0;
675 scsi_for_each_sg(cmd, sg, nseg, i) {
676 struct srp_direct_buf *descr = md + i;
677 descr->va = cpu_to_be64(sg_dma_address(sg));
678 descr->len = cpu_to_be32(sg_dma_len(sg));
680 total_length += sg_dma_len(sg);
686 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
687 * @cmd: struct scsi_cmnd with the scatterlist
688 * @srp_cmd: srp_cmd that contains the memory descriptor
689 * @dev: device for which to map dma memory
691 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
692 * Returns 1 on success.
694 static int map_sg_data(struct scsi_cmnd *cmd,
695 struct srp_event_struct *evt_struct,
696 struct srp_cmd *srp_cmd, struct device *dev)
700 u64 total_length = 0;
701 struct srp_direct_buf *data =
702 (struct srp_direct_buf *) srp_cmd->add_data;
703 struct srp_indirect_buf *indirect =
704 (struct srp_indirect_buf *) data;
706 sg_mapped = scsi_dma_map(cmd);
709 else if (sg_mapped < 0)
712 set_srp_direction(cmd, srp_cmd, sg_mapped);
714 /* special case; we can use a single direct descriptor */
715 if (sg_mapped == 1) {
716 map_sg_list(cmd, sg_mapped, data);
720 indirect->table_desc.va = 0;
721 indirect->table_desc.len = cpu_to_be32(sg_mapped *
722 sizeof(struct srp_direct_buf));
723 indirect->table_desc.key = 0;
725 if (sg_mapped <= MAX_INDIRECT_BUFS) {
726 total_length = map_sg_list(cmd, sg_mapped,
727 &indirect->desc_list[0]);
728 indirect->len = cpu_to_be32(total_length);
732 /* get indirect table */
733 if (!evt_struct->ext_list) {
734 evt_struct->ext_list = (struct srp_direct_buf *)
735 dma_alloc_coherent(dev,
736 SG_ALL * sizeof(struct srp_direct_buf),
737 &evt_struct->ext_list_token, 0);
738 if (!evt_struct->ext_list) {
739 if (!firmware_has_feature(FW_FEATURE_CMO))
740 sdev_printk(KERN_ERR, cmd->device,
741 "Can't allocate memory "
742 "for indirect table\n");
748 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
750 indirect->len = cpu_to_be32(total_length);
751 indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token);
752 indirect->table_desc.len = cpu_to_be32(sg_mapped *
753 sizeof(indirect->desc_list[0]));
754 memcpy(indirect->desc_list, evt_struct->ext_list,
755 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
760 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
761 * @cmd: struct scsi_cmnd with the memory to be mapped
762 * @srp_cmd: srp_cmd that contains the memory descriptor
763 * @dev: dma device for which to map dma memory
765 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
766 * Returns 1 on success.
768 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
769 struct srp_event_struct *evt_struct,
770 struct srp_cmd *srp_cmd, struct device *dev)
772 switch (cmd->sc_data_direction) {
773 case DMA_FROM_DEVICE:
778 case DMA_BIDIRECTIONAL:
779 sdev_printk(KERN_ERR, cmd->device,
780 "Can't map DMA_BIDIRECTIONAL to read/write\n");
783 sdev_printk(KERN_ERR, cmd->device,
784 "Unknown data direction 0x%02x; can't map!\n",
785 cmd->sc_data_direction);
789 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
793 * purge_requests: Our virtual adapter just shut down. purge any sent requests
794 * @hostdata: the adapter
796 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
798 struct srp_event_struct *evt;
801 spin_lock_irqsave(hostdata->host->host_lock, flags);
802 while (!list_empty(&hostdata->sent)) {
803 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
804 list_del(&evt->list);
805 del_timer(&evt->timer);
807 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
809 evt->cmnd->result = (error_code << 16);
810 unmap_cmd_data(&evt->iu.srp.cmd, evt,
813 evt->cmnd_done(evt->cmnd);
814 } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&
815 evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
817 free_event_struct(&evt->hostdata->pool, evt);
818 spin_lock_irqsave(hostdata->host->host_lock, flags);
820 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
824 * ibmvscsi_reset_host - Reset the connection to the server
825 * @hostdata: struct ibmvscsi_host_data to reset
827 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
829 scsi_block_requests(hostdata->host);
830 atomic_set(&hostdata->request_limit, 0);
832 purge_requests(hostdata, DID_ERROR);
833 hostdata->reset_crq = 1;
834 wake_up(&hostdata->work_wait_q);
838 * ibmvscsi_timeout - Internal command timeout handler
839 * @evt_struct: struct srp_event_struct that timed out
841 * Called when an internally generated command times out
843 static void ibmvscsi_timeout(struct timer_list *t)
845 struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer);
846 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
848 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
849 evt_struct->iu.srp.cmd.opcode);
851 ibmvscsi_reset_host(hostdata);
855 /* ------------------------------------------------------------
856 * Routines for sending and receiving SRPs
859 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
860 * @evt_struct: evt_struct to be sent
861 * @hostdata: ibmvscsi_host_data of host
862 * @timeout: timeout in seconds - 0 means do not time command
864 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
865 * Note that this routine assumes that host_lock is held for synchronization
867 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
868 struct ibmvscsi_host_data *hostdata,
869 unsigned long timeout)
871 __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq;
872 int request_status = 0;
876 /* If we have exhausted our request limit, just fail this request,
877 * unless it is for a reset or abort.
878 * Note that there are rare cases involving driver generated requests
879 * (such as task management requests) that the mid layer may think we
880 * can handle more requests (can_queue) when we actually can't
882 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
885 atomic_dec_if_positive(&hostdata->request_limit);
886 /* If request limit was -1 when we started, it is now even
889 if (request_status < -1)
891 /* Otherwise, we may have run out of requests. */
892 /* If request limit was 0 when we started the adapter is in the
893 * process of performing a login with the server adapter, or
894 * we may have run out of requests.
896 else if (request_status == -1 &&
897 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
899 /* Abort and reset calls should make it through.
900 * Nothing except abort and reset should use the last two
901 * slots unless we had two or less to begin with.
903 else if (request_status < 2 &&
904 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
905 /* In the case that we have less than two requests
906 * available, check the server limit as a combination
907 * of the request limit and the number of requests
908 * in-flight (the size of the send list). If the
909 * server limit is greater than 2, return busy so
910 * that the last two are reserved for reset and abort.
912 int server_limit = request_status;
913 struct srp_event_struct *tmp_evt;
915 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
919 if (server_limit > 2)
924 /* Copy the IU into the transfer area */
925 *evt_struct->xfer_iu = evt_struct->iu;
926 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
928 /* Add this to the sent list. We need to do this
929 * before we actually send
930 * in case it comes back REALLY fast
932 list_add_tail(&evt_struct->list, &hostdata->sent);
934 timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0);
936 evt_struct->timer.expires = jiffies + (timeout * HZ);
937 add_timer(&evt_struct->timer);
940 rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]),
941 be64_to_cpu(crq_as_u64[1]));
943 list_del(&evt_struct->list);
944 del_timer(&evt_struct->timer);
946 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
947 * Firmware will send a CRQ with a transport event (0xFF) to
948 * tell this client what has happened to the transport. This
949 * will be handled in ibmvscsi_handle_crq()
951 if (rc == H_CLOSED) {
952 dev_warn(hostdata->dev, "send warning. "
953 "Receive queue closed, will retry.\n");
956 dev_err(hostdata->dev, "send error %d\n", rc);
958 atomic_inc(&hostdata->request_limit);
965 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
967 free_event_struct(&hostdata->pool, evt_struct);
968 if (srp_req && request_status != -1)
969 atomic_inc(&hostdata->request_limit);
970 return SCSI_MLQUEUE_HOST_BUSY;
973 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
975 if (evt_struct->cmnd != NULL) {
976 evt_struct->cmnd->result = DID_ERROR << 16;
977 evt_struct->cmnd_done(evt_struct->cmnd);
978 } else if (evt_struct->done)
979 evt_struct->done(evt_struct);
981 free_event_struct(&hostdata->pool, evt_struct);
986 * handle_cmd_rsp: - Handle responses from commands
987 * @evt_struct: srp_event_struct to be handled
989 * Used as a callback by when sending scsi cmds.
990 * Gets called by ibmvscsi_handle_crq()
992 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
994 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
995 struct scsi_cmnd *cmnd = evt_struct->cmnd;
997 if (unlikely(rsp->opcode != SRP_RSP)) {
998 if (printk_ratelimit())
999 dev_warn(evt_struct->hostdata->dev,
1000 "bad SRP RSP type %#02x\n", rsp->opcode);
1004 cmnd->result |= rsp->status;
1005 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
1006 memcpy(cmnd->sense_buffer,
1008 be32_to_cpu(rsp->sense_data_len));
1009 unmap_cmd_data(&evt_struct->iu.srp.cmd,
1011 evt_struct->hostdata->dev);
1013 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
1014 scsi_set_resid(cmnd,
1015 be32_to_cpu(rsp->data_out_res_cnt));
1016 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
1017 scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt));
1020 if (evt_struct->cmnd_done)
1021 evt_struct->cmnd_done(cmnd);
1025 * lun_from_dev: - Returns the lun of the scsi device
1026 * @dev: struct scsi_device
1029 static inline u16 lun_from_dev(struct scsi_device *dev)
1031 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
1035 * ibmvscsi_queue: - The queuecommand function of the scsi template
1036 * @cmd: struct scsi_cmnd to be executed
1037 * @done: Callback function to be called when cmd is completed
1039 static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
1040 void (*done) (struct scsi_cmnd *))
1042 struct srp_cmd *srp_cmd;
1043 struct srp_event_struct *evt_struct;
1044 struct srp_indirect_buf *indirect;
1045 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
1046 u16 lun = lun_from_dev(cmnd->device);
1049 cmnd->result = (DID_OK << 16);
1050 evt_struct = get_event_struct(&hostdata->pool);
1052 return SCSI_MLQUEUE_HOST_BUSY;
1054 /* Set up the actual SRP IU */
1055 srp_cmd = &evt_struct->iu.srp.cmd;
1056 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
1057 srp_cmd->opcode = SRP_CMD;
1058 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
1059 int_to_scsilun(lun, &srp_cmd->lun);
1061 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
1062 if (!firmware_has_feature(FW_FEATURE_CMO))
1063 sdev_printk(KERN_ERR, cmnd->device,
1064 "couldn't convert cmd to srp_cmd\n");
1065 free_event_struct(&hostdata->pool, evt_struct);
1066 return SCSI_MLQUEUE_HOST_BUSY;
1069 init_event_struct(evt_struct,
1072 cmnd->request->timeout/HZ);
1074 evt_struct->cmnd = cmnd;
1075 evt_struct->cmnd_done = done;
1077 /* Fix up dma address of the buffer itself */
1078 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
1079 out_fmt = srp_cmd->buf_fmt >> 4;
1080 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
1081 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
1082 out_fmt == SRP_DATA_DESC_INDIRECT) &&
1083 indirect->table_desc.va == 0) {
1084 indirect->table_desc.va =
1085 cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) +
1086 offsetof(struct srp_cmd, add_data) +
1087 offsetof(struct srp_indirect_buf, desc_list));
1090 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
1093 static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
1095 /* ------------------------------------------------------------
1096 * Routines for driver initialization
1100 * map_persist_bufs: - Pre-map persistent data for adapter logins
1101 * @hostdata: ibmvscsi_host_data of host
1103 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
1104 * Return 1 on error, 0 on success.
1106 static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
1109 hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
1110 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1112 if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
1113 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
1117 hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
1118 &hostdata->madapter_info,
1119 sizeof(hostdata->madapter_info),
1121 if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
1122 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
1123 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1124 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1132 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
1133 * @hostdata: ibmvscsi_host_data of host
1135 * Unmap the capabilities and adapter info DMA buffers
1137 static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
1139 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1140 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1142 dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
1143 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
1147 * login_rsp: - Handle response to SRP login request
1148 * @evt_struct: srp_event_struct with the response
1150 * Used as a "done" callback by when sending srp_login. Gets called
1151 * by ibmvscsi_handle_crq()
1153 static void login_rsp(struct srp_event_struct *evt_struct)
1155 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1156 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
1157 case SRP_LOGIN_RSP: /* it worked! */
1159 case SRP_LOGIN_REJ: /* refused! */
1160 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
1161 evt_struct->xfer_iu->srp.login_rej.reason);
1163 atomic_set(&hostdata->request_limit, -1);
1166 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
1167 evt_struct->xfer_iu->srp.login_rsp.opcode);
1169 atomic_set(&hostdata->request_limit, -1);
1173 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
1174 hostdata->client_migrated = 0;
1176 /* Now we know what the real request-limit is.
1177 * This value is set rather than added to request_limit because
1178 * request_limit could have been set to -1 by this client.
1180 atomic_set(&hostdata->request_limit,
1181 be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta));
1183 /* If we had any pending I/Os, kick them */
1184 scsi_unblock_requests(hostdata->host);
1188 * send_srp_login: - Sends the srp login
1189 * @hostdata: ibmvscsi_host_data of host
1191 * Returns zero if successful.
1193 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
1196 unsigned long flags;
1197 struct srp_login_req *login;
1198 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
1200 BUG_ON(!evt_struct);
1201 init_event_struct(evt_struct, login_rsp,
1202 VIOSRP_SRP_FORMAT, login_timeout);
1204 login = &evt_struct->iu.srp.login_req;
1205 memset(login, 0, sizeof(*login));
1206 login->opcode = SRP_LOGIN_REQ;
1207 login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
1208 login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
1209 SRP_BUF_FORMAT_INDIRECT);
1211 spin_lock_irqsave(hostdata->host->host_lock, flags);
1212 /* Start out with a request limit of 0, since this is negotiated in
1213 * the login request we are just sending and login requests always
1214 * get sent by the driver regardless of request_limit.
1216 atomic_set(&hostdata->request_limit, 0);
1218 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
1219 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1220 dev_info(hostdata->dev, "sent SRP login\n");
1225 * capabilities_rsp: - Handle response to MAD adapter capabilities request
1226 * @evt_struct: srp_event_struct with the response
1228 * Used as a "done" callback by when sending adapter_info.
1230 static void capabilities_rsp(struct srp_event_struct *evt_struct)
1232 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1234 if (evt_struct->xfer_iu->mad.capabilities.common.status) {
1235 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
1236 evt_struct->xfer_iu->mad.capabilities.common.status);
1238 if (hostdata->caps.migration.common.server_support !=
1239 cpu_to_be16(SERVER_SUPPORTS_CAP))
1240 dev_info(hostdata->dev, "Partition migration not supported\n");
1242 if (client_reserve) {
1243 if (hostdata->caps.reserve.common.server_support ==
1244 cpu_to_be16(SERVER_SUPPORTS_CAP))
1245 dev_info(hostdata->dev, "Client reserve enabled\n");
1247 dev_info(hostdata->dev, "Client reserve not supported\n");
1251 send_srp_login(hostdata);
1255 * send_mad_capabilities: - Sends the mad capabilities request
1256 * and stores the result so it can be retrieved with
1257 * @hostdata: ibmvscsi_host_data of host
1259 static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
1261 struct viosrp_capabilities *req;
1262 struct srp_event_struct *evt_struct;
1263 unsigned long flags;
1264 struct device_node *of_node = hostdata->dev->of_node;
1265 const char *location;
1267 evt_struct = get_event_struct(&hostdata->pool);
1268 BUG_ON(!evt_struct);
1270 init_event_struct(evt_struct, capabilities_rsp,
1271 VIOSRP_MAD_FORMAT, info_timeout);
1273 req = &evt_struct->iu.mad.capabilities;
1274 memset(req, 0, sizeof(*req));
1276 hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED);
1277 if (hostdata->client_migrated)
1278 hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);
1280 strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
1281 sizeof(hostdata->caps.name));
1283 location = of_get_property(of_node, "ibm,loc-code", NULL);
1284 location = location ? location : dev_name(hostdata->dev);
1285 strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
1287 req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);
1288 req->buffer = cpu_to_be64(hostdata->caps_addr);
1290 hostdata->caps.migration.common.cap_type =
1291 cpu_to_be32(MIGRATION_CAPABILITIES);
1292 hostdata->caps.migration.common.length =
1293 cpu_to_be16(sizeof(hostdata->caps.migration));
1294 hostdata->caps.migration.common.server_support =
1295 cpu_to_be16(SERVER_SUPPORTS_CAP);
1296 hostdata->caps.migration.ecl = cpu_to_be32(1);
1298 if (client_reserve) {
1299 hostdata->caps.reserve.common.cap_type =
1300 cpu_to_be32(RESERVATION_CAPABILITIES);
1301 hostdata->caps.reserve.common.length =
1302 cpu_to_be16(sizeof(hostdata->caps.reserve));
1303 hostdata->caps.reserve.common.server_support =
1304 cpu_to_be16(SERVER_SUPPORTS_CAP);
1305 hostdata->caps.reserve.type =
1306 cpu_to_be32(CLIENT_RESERVE_SCSI_2);
1307 req->common.length =
1308 cpu_to_be16(sizeof(hostdata->caps));
1310 req->common.length = cpu_to_be16(sizeof(hostdata->caps) -
1311 sizeof(hostdata->caps.reserve));
1313 spin_lock_irqsave(hostdata->host->host_lock, flags);
1314 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1315 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
1316 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1320 * fast_fail_rsp: - Handle response to MAD enable fast fail
1321 * @evt_struct: srp_event_struct with the response
1323 * Used as a "done" callback by when sending enable fast fail. Gets called
1324 * by ibmvscsi_handle_crq()
1326 static void fast_fail_rsp(struct srp_event_struct *evt_struct)
1328 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1329 u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status);
1331 if (status == VIOSRP_MAD_NOT_SUPPORTED)
1332 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1333 else if (status == VIOSRP_MAD_FAILED)
1334 dev_err(hostdata->dev, "fast_fail request failed\n");
1335 else if (status != VIOSRP_MAD_SUCCESS)
1336 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1338 send_mad_capabilities(hostdata);
1342 * init_host - Start host initialization
1343 * @hostdata: ibmvscsi_host_data of host
1345 * Returns zero if successful.
1347 static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1350 unsigned long flags;
1351 struct viosrp_fast_fail *fast_fail_mad;
1352 struct srp_event_struct *evt_struct;
1355 send_mad_capabilities(hostdata);
1359 evt_struct = get_event_struct(&hostdata->pool);
1360 BUG_ON(!evt_struct);
1362 init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1364 fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1365 memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1366 fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL);
1367 fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad));
1369 spin_lock_irqsave(hostdata->host->host_lock, flags);
1370 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1371 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1376 * adapter_info_rsp: - Handle response to MAD adapter info request
1377 * @evt_struct: srp_event_struct with the response
1379 * Used as a "done" callback by when sending adapter_info. Gets called
1380 * by ibmvscsi_handle_crq()
1382 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1384 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1386 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1387 dev_err(hostdata->dev, "error %d getting adapter info\n",
1388 evt_struct->xfer_iu->mad.adapter_info.common.status);
1390 dev_info(hostdata->dev, "host srp version: %s, "
1391 "host partition %s (%d), OS %d, max io %u\n",
1392 hostdata->madapter_info.srp_version,
1393 hostdata->madapter_info.partition_name,
1394 be32_to_cpu(hostdata->madapter_info.partition_number),
1395 be32_to_cpu(hostdata->madapter_info.os_type),
1396 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));
1398 if (hostdata->madapter_info.port_max_txu[0])
1399 hostdata->host->max_sectors =
1400 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9;
1402 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX &&
1403 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1404 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1405 hostdata->madapter_info.srp_version);
1406 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1408 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1411 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) {
1412 enable_fast_fail(hostdata);
1417 send_srp_login(hostdata);
1421 * send_mad_adapter_info: - Sends the mad adapter info request
1422 * and stores the result so it can be retrieved with
1423 * sysfs. We COULD consider causing a failure if the
1424 * returned SRP version doesn't match ours.
1425 * @hostdata: ibmvscsi_host_data of host
1427 * Returns zero if successful.
1429 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1431 struct viosrp_adapter_info *req;
1432 struct srp_event_struct *evt_struct;
1433 unsigned long flags;
1435 evt_struct = get_event_struct(&hostdata->pool);
1436 BUG_ON(!evt_struct);
1438 init_event_struct(evt_struct,
1443 req = &evt_struct->iu.mad.adapter_info;
1444 memset(req, 0x00, sizeof(*req));
1446 req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE);
1447 req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info));
1448 req->buffer = cpu_to_be64(hostdata->adapter_info_addr);
1450 spin_lock_irqsave(hostdata->host->host_lock, flags);
1451 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1452 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1453 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1457 * init_adapter: Start virtual adapter initialization sequence
1460 static void init_adapter(struct ibmvscsi_host_data *hostdata)
1462 send_mad_adapter_info(hostdata);
1466 * sync_completion: Signal that a synchronous command has completed
1467 * Note that after returning from this call, the evt_struct is freed.
1468 * the caller waiting on this completion shouldn't touch the evt_struct
1471 static void sync_completion(struct srp_event_struct *evt_struct)
1473 /* copy the response back */
1474 if (evt_struct->sync_srp)
1475 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1477 complete(&evt_struct->comp);
1481 * ibmvscsi_abort: Abort a command...from scsi host template
1482 * send this over to the server and wait synchronously for the response
1484 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1486 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1487 struct srp_tsk_mgmt *tsk_mgmt;
1488 struct srp_event_struct *evt;
1489 struct srp_event_struct *tmp_evt, *found_evt;
1490 union viosrp_iu srp_rsp;
1492 unsigned long flags;
1493 u16 lun = lun_from_dev(cmd->device);
1494 unsigned long wait_switch = 0;
1496 /* First, find this command in our sent list so we can figure
1497 * out the correct tag
1499 spin_lock_irqsave(hostdata->host->host_lock, flags);
1500 wait_switch = jiffies + (init_timeout * HZ);
1503 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1504 if (tmp_evt->cmnd == cmd) {
1505 found_evt = tmp_evt;
1511 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1515 evt = get_event_struct(&hostdata->pool);
1517 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1518 sdev_printk(KERN_ERR, cmd->device,
1519 "failed to allocate abort event\n");
1523 init_event_struct(evt,
1528 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1530 /* Set up an abort SRP command */
1531 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1532 tsk_mgmt->opcode = SRP_TSK_MGMT;
1533 int_to_scsilun(lun, &tsk_mgmt->lun);
1534 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1535 tsk_mgmt->task_tag = (u64) found_evt;
1537 evt->sync_srp = &srp_rsp;
1539 init_completion(&evt->comp);
1540 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1542 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1545 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1547 spin_lock_irqsave(hostdata->host->host_lock, flags);
1548 } while (time_before(jiffies, wait_switch));
1550 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1553 sdev_printk(KERN_ERR, cmd->device,
1554 "failed to send abort() event. rc=%d\n", rsp_rc);
1558 sdev_printk(KERN_INFO, cmd->device,
1559 "aborting command. lun 0x%llx, tag 0x%llx\n",
1560 (((u64) lun) << 48), (u64) found_evt);
1562 wait_for_completion(&evt->comp);
1564 /* make sure we got a good response */
1565 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1566 if (printk_ratelimit())
1567 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1568 srp_rsp.srp.rsp.opcode);
1572 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1573 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1575 rsp_rc = srp_rsp.srp.rsp.status;
1578 if (printk_ratelimit())
1579 sdev_printk(KERN_WARNING, cmd->device,
1580 "abort code %d for task tag 0x%llx\n",
1581 rsp_rc, tsk_mgmt->task_tag);
1585 /* Because we dropped the spinlock above, it's possible
1586 * The event is no longer in our list. Make sure it didn't
1587 * complete while we were aborting
1589 spin_lock_irqsave(hostdata->host->host_lock, flags);
1591 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1592 if (tmp_evt->cmnd == cmd) {
1593 found_evt = tmp_evt;
1598 if (found_evt == NULL) {
1599 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1600 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1601 tsk_mgmt->task_tag);
1605 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1606 tsk_mgmt->task_tag);
1608 cmd->result = (DID_ABORT << 16);
1609 list_del(&found_evt->list);
1610 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1611 found_evt->hostdata->dev);
1612 free_event_struct(&found_evt->hostdata->pool, found_evt);
1613 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1614 atomic_inc(&hostdata->request_limit);
1619 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1620 * template send this over to the server and wait synchronously for the
1623 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1625 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1626 struct srp_tsk_mgmt *tsk_mgmt;
1627 struct srp_event_struct *evt;
1628 struct srp_event_struct *tmp_evt, *pos;
1629 union viosrp_iu srp_rsp;
1631 unsigned long flags;
1632 u16 lun = lun_from_dev(cmd->device);
1633 unsigned long wait_switch = 0;
1635 spin_lock_irqsave(hostdata->host->host_lock, flags);
1636 wait_switch = jiffies + (init_timeout * HZ);
1638 evt = get_event_struct(&hostdata->pool);
1640 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1641 sdev_printk(KERN_ERR, cmd->device,
1642 "failed to allocate reset event\n");
1646 init_event_struct(evt,
1651 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1653 /* Set up a lun reset SRP command */
1654 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1655 tsk_mgmt->opcode = SRP_TSK_MGMT;
1656 int_to_scsilun(lun, &tsk_mgmt->lun);
1657 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1659 evt->sync_srp = &srp_rsp;
1661 init_completion(&evt->comp);
1662 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1664 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1667 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1669 spin_lock_irqsave(hostdata->host->host_lock, flags);
1670 } while (time_before(jiffies, wait_switch));
1672 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1675 sdev_printk(KERN_ERR, cmd->device,
1676 "failed to send reset event. rc=%d\n", rsp_rc);
1680 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1681 (((u64) lun) << 48));
1683 wait_for_completion(&evt->comp);
1685 /* make sure we got a good response */
1686 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1687 if (printk_ratelimit())
1688 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1689 srp_rsp.srp.rsp.opcode);
1693 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1694 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1696 rsp_rc = srp_rsp.srp.rsp.status;
1699 if (printk_ratelimit())
1700 sdev_printk(KERN_WARNING, cmd->device,
1701 "reset code %d for task tag 0x%llx\n",
1702 rsp_rc, tsk_mgmt->task_tag);
1706 /* We need to find all commands for this LUN that have not yet been
1707 * responded to, and fail them with DID_RESET
1709 spin_lock_irqsave(hostdata->host->host_lock, flags);
1710 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1711 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1713 tmp_evt->cmnd->result = (DID_RESET << 16);
1714 list_del(&tmp_evt->list);
1715 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1716 tmp_evt->hostdata->dev);
1717 free_event_struct(&tmp_evt->hostdata->pool,
1719 atomic_inc(&hostdata->request_limit);
1720 if (tmp_evt->cmnd_done)
1721 tmp_evt->cmnd_done(tmp_evt->cmnd);
1722 else if (tmp_evt->done)
1723 tmp_evt->done(tmp_evt);
1726 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1731 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1732 * @cmd: struct scsi_cmnd having problems
1734 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1736 unsigned long wait_switch = 0;
1737 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1739 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1741 ibmvscsi_reset_host(hostdata);
1743 for (wait_switch = jiffies + (init_timeout * HZ);
1744 time_before(jiffies, wait_switch) &&
1745 atomic_read(&hostdata->request_limit) < 2;) {
1750 if (atomic_read(&hostdata->request_limit) <= 0)
1757 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1758 * @crq: Command/Response queue
1759 * @hostdata: ibmvscsi_host_data of host
1762 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1763 struct ibmvscsi_host_data *hostdata)
1766 unsigned long flags;
1767 /* The hypervisor copies our tag value here so no byteswapping */
1768 struct srp_event_struct *evt_struct =
1769 (__force struct srp_event_struct *)crq->IU_data_ptr;
1770 switch (crq->valid) {
1771 case VIOSRP_CRQ_INIT_RSP: /* initialization */
1772 switch (crq->format) {
1773 case VIOSRP_CRQ_INIT: /* Initialization message */
1774 dev_info(hostdata->dev, "partner initialized\n");
1775 /* Send back a response */
1776 rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
1779 init_adapter(hostdata);
1781 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1785 case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */
1786 dev_info(hostdata->dev, "partner initialization complete\n");
1789 init_adapter(hostdata);
1792 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1795 case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */
1796 scsi_block_requests(hostdata->host);
1797 atomic_set(&hostdata->request_limit, 0);
1798 if (crq->format == 0x06) {
1799 /* We need to re-setup the interpartition connection */
1800 dev_info(hostdata->dev, "Re-enabling adapter!\n");
1801 hostdata->client_migrated = 1;
1802 hostdata->reenable_crq = 1;
1803 purge_requests(hostdata, DID_REQUEUE);
1804 wake_up(&hostdata->work_wait_q);
1806 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1808 ibmvscsi_reset_host(hostdata);
1811 case VIOSRP_CRQ_CMD_RSP: /* real payload */
1814 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1819 /* The only kind of payload CRQs we should get are responses to
1820 * things we send. Make sure this response is to something we
1823 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1824 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1829 if (atomic_read(&evt_struct->free)) {
1830 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1835 if (crq->format == VIOSRP_SRP_FORMAT)
1836 atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta),
1837 &hostdata->request_limit);
1839 del_timer(&evt_struct->timer);
1841 if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1842 evt_struct->cmnd->result = DID_ERROR << 16;
1843 if (evt_struct->done)
1844 evt_struct->done(evt_struct);
1846 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1849 * Lock the host_lock before messing with these structures, since we
1850 * are running in a task context
1852 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1853 list_del(&evt_struct->list);
1854 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1855 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1859 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1860 * @sdev: struct scsi_device device to configure
1862 * Enable allow_restart for a device if it is a disk. Adjust the
1863 * queue_depth here also as is required by the documentation for
1864 * struct scsi_host_template.
1866 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1868 struct Scsi_Host *shost = sdev->host;
1869 unsigned long lock_flags = 0;
1871 spin_lock_irqsave(shost->host_lock, lock_flags);
1872 if (sdev->type == TYPE_DISK) {
1873 sdev->allow_restart = 1;
1874 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1876 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1881 * ibmvscsi_change_queue_depth - Change the device's queue depth
1882 * @sdev: scsi device struct
1883 * @qdepth: depth to set
1884 * @reason: calling context
1889 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1891 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1892 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1893 return scsi_change_queue_depth(sdev, qdepth);
1896 /* ------------------------------------------------------------
1899 static ssize_t show_host_vhost_loc(struct device *dev,
1900 struct device_attribute *attr, char *buf)
1902 struct Scsi_Host *shost = class_to_shost(dev);
1903 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1906 len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1907 hostdata->caps.loc);
1911 static struct device_attribute ibmvscsi_host_vhost_loc = {
1913 .name = "vhost_loc",
1916 .show = show_host_vhost_loc,
1919 static ssize_t show_host_vhost_name(struct device *dev,
1920 struct device_attribute *attr, char *buf)
1922 struct Scsi_Host *shost = class_to_shost(dev);
1923 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1926 len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1927 hostdata->caps.name);
1931 static struct device_attribute ibmvscsi_host_vhost_name = {
1933 .name = "vhost_name",
1936 .show = show_host_vhost_name,
1939 static ssize_t show_host_srp_version(struct device *dev,
1940 struct device_attribute *attr, char *buf)
1942 struct Scsi_Host *shost = class_to_shost(dev);
1943 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1946 len = snprintf(buf, PAGE_SIZE, "%s\n",
1947 hostdata->madapter_info.srp_version);
1951 static struct device_attribute ibmvscsi_host_srp_version = {
1953 .name = "srp_version",
1956 .show = show_host_srp_version,
1959 static ssize_t show_host_partition_name(struct device *dev,
1960 struct device_attribute *attr,
1963 struct Scsi_Host *shost = class_to_shost(dev);
1964 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1967 len = snprintf(buf, PAGE_SIZE, "%s\n",
1968 hostdata->madapter_info.partition_name);
1972 static struct device_attribute ibmvscsi_host_partition_name = {
1974 .name = "partition_name",
1977 .show = show_host_partition_name,
1980 static ssize_t show_host_partition_number(struct device *dev,
1981 struct device_attribute *attr,
1984 struct Scsi_Host *shost = class_to_shost(dev);
1985 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1988 len = snprintf(buf, PAGE_SIZE, "%d\n",
1989 be32_to_cpu(hostdata->madapter_info.partition_number));
1993 static struct device_attribute ibmvscsi_host_partition_number = {
1995 .name = "partition_number",
1998 .show = show_host_partition_number,
2001 static ssize_t show_host_mad_version(struct device *dev,
2002 struct device_attribute *attr, char *buf)
2004 struct Scsi_Host *shost = class_to_shost(dev);
2005 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2008 len = snprintf(buf, PAGE_SIZE, "%d\n",
2009 be32_to_cpu(hostdata->madapter_info.mad_version));
2013 static struct device_attribute ibmvscsi_host_mad_version = {
2015 .name = "mad_version",
2018 .show = show_host_mad_version,
2021 static ssize_t show_host_os_type(struct device *dev,
2022 struct device_attribute *attr, char *buf)
2024 struct Scsi_Host *shost = class_to_shost(dev);
2025 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2028 len = snprintf(buf, PAGE_SIZE, "%d\n",
2029 be32_to_cpu(hostdata->madapter_info.os_type));
2033 static struct device_attribute ibmvscsi_host_os_type = {
2038 .show = show_host_os_type,
2041 static ssize_t show_host_config(struct device *dev,
2042 struct device_attribute *attr, char *buf)
2047 static struct device_attribute ibmvscsi_host_config = {
2052 .show = show_host_config,
2055 static struct device_attribute *ibmvscsi_attrs[] = {
2056 &ibmvscsi_host_vhost_loc,
2057 &ibmvscsi_host_vhost_name,
2058 &ibmvscsi_host_srp_version,
2059 &ibmvscsi_host_partition_name,
2060 &ibmvscsi_host_partition_number,
2061 &ibmvscsi_host_mad_version,
2062 &ibmvscsi_host_os_type,
2063 &ibmvscsi_host_config,
2067 /* ------------------------------------------------------------
2068 * SCSI driver registration
2070 static struct scsi_host_template driver_template = {
2071 .module = THIS_MODULE,
2072 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
2073 .proc_name = "ibmvscsi",
2074 .queuecommand = ibmvscsi_queuecommand,
2075 .eh_timed_out = srp_timed_out,
2076 .eh_abort_handler = ibmvscsi_eh_abort_handler,
2077 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
2078 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
2079 .slave_configure = ibmvscsi_slave_configure,
2080 .change_queue_depth = ibmvscsi_change_queue_depth,
2081 .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
2082 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
2084 .sg_tablesize = SG_ALL,
2085 .use_clustering = ENABLE_CLUSTERING,
2086 .shost_attrs = ibmvscsi_attrs,
2090 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
2092 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
2095 * Number of bytes of IO data the driver will need to perform well.
2097 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
2099 /* iu_storage data allocated in initialize_event_pool */
2100 unsigned long desired_io = max_events * sizeof(union viosrp_iu);
2102 /* add io space for sg data */
2103 desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
2104 IBMVSCSI_CMDS_PER_LUN_DEFAULT);
2109 static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
2112 char *action = "reset";
2114 if (hostdata->reset_crq) {
2116 hostdata->reset_crq = 0;
2118 rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
2120 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2121 vio_enable_interrupts(to_vio_dev(hostdata->dev));
2122 } else if (hostdata->reenable_crq) {
2125 rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
2126 hostdata->reenable_crq = 0;
2128 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2133 atomic_set(&hostdata->request_limit, -1);
2134 dev_err(hostdata->dev, "error after %s\n", action);
2137 scsi_unblock_requests(hostdata->host);
2140 static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2142 if (kthread_should_stop())
2144 else if (hostdata->reset_crq) {
2147 } else if (hostdata->reenable_crq) {
2155 static int ibmvscsi_work(void *data)
2157 struct ibmvscsi_host_data *hostdata = data;
2160 set_user_nice(current, MIN_NICE);
2163 rc = wait_event_interruptible(hostdata->work_wait_q,
2164 ibmvscsi_work_to_do(hostdata));
2168 if (kthread_should_stop())
2171 ibmvscsi_do_work(hostdata);
2178 * Called by bus code for each adapter
2180 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2182 struct ibmvscsi_host_data *hostdata;
2183 struct Scsi_Host *host;
2184 struct device *dev = &vdev->dev;
2185 struct srp_rport_identifiers ids;
2186 struct srp_rport *rport;
2187 unsigned long wait_switch = 0;
2190 dev_set_drvdata(&vdev->dev, NULL);
2192 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
2194 dev_err(&vdev->dev, "couldn't allocate host data\n");
2195 goto scsi_host_alloc_failed;
2198 host->transportt = ibmvscsi_transport_template;
2199 hostdata = shost_priv(host);
2200 memset(hostdata, 0x00, sizeof(*hostdata));
2201 INIT_LIST_HEAD(&hostdata->sent);
2202 init_waitqueue_head(&hostdata->work_wait_q);
2203 hostdata->host = host;
2204 hostdata->dev = dev;
2205 atomic_set(&hostdata->request_limit, -1);
2206 hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
2208 if (map_persist_bufs(hostdata)) {
2209 dev_err(&vdev->dev, "couldn't map persistent buffers\n");
2210 goto persist_bufs_failed;
2213 hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
2214 "ibmvscsi", host->host_no);
2216 if (IS_ERR(hostdata->work_thread)) {
2217 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
2218 PTR_ERR(hostdata->work_thread));
2219 goto init_crq_failed;
2222 rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
2223 if (rc != 0 && rc != H_RESOURCE) {
2224 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
2227 if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
2228 dev_err(&vdev->dev, "couldn't initialize event pool\n");
2229 goto init_pool_failed;
2232 host->max_lun = IBMVSCSI_MAX_LUN;
2233 host->max_id = max_id;
2234 host->max_channel = max_channel;
2235 host->max_cmd_len = 16;
2238 "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n",
2239 host->max_id, host->max_lun, host->max_channel);
2241 if (scsi_add_host(hostdata->host, hostdata->dev))
2242 goto add_host_failed;
2244 /* we don't have a proper target_port_id so let's use the fake one */
2245 memcpy(ids.port_id, hostdata->madapter_info.partition_name,
2246 sizeof(ids.port_id));
2247 ids.roles = SRP_RPORT_ROLE_TARGET;
2248 rport = srp_rport_add(host, &ids);
2250 goto add_srp_port_failed;
2252 /* Try to send an initialization message. Note that this is allowed
2253 * to fail if the other end is not acive. In that case we don't
2256 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
2257 || rc == H_RESOURCE) {
2259 * Wait around max init_timeout secs for the adapter to finish
2260 * initializing. When we are done initializing, we will have a
2261 * valid request_limit. We don't want Linux scanning before
2264 for (wait_switch = jiffies + (init_timeout * HZ);
2265 time_before(jiffies, wait_switch) &&
2266 atomic_read(&hostdata->request_limit) < 2;) {
2271 /* if we now have a valid request_limit, initiate a scan */
2272 if (atomic_read(&hostdata->request_limit) > 0)
2273 scsi_scan_host(host);
2276 dev_set_drvdata(&vdev->dev, hostdata);
2277 spin_lock(&ibmvscsi_driver_lock);
2278 list_add_tail(&hostdata->host_list, &ibmvscsi_head);
2279 spin_unlock(&ibmvscsi_driver_lock);
2282 add_srp_port_failed:
2283 scsi_remove_host(hostdata->host);
2285 release_event_pool(&hostdata->pool, hostdata);
2287 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
2289 kthread_stop(hostdata->work_thread);
2291 unmap_persist_bufs(hostdata);
2292 persist_bufs_failed:
2293 scsi_host_put(host);
2294 scsi_host_alloc_failed:
2298 static int ibmvscsi_remove(struct vio_dev *vdev)
2300 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2302 srp_remove_host(hostdata->host);
2303 scsi_remove_host(hostdata->host);
2305 purge_requests(hostdata, DID_ERROR);
2306 release_event_pool(&hostdata->pool, hostdata);
2308 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
2311 kthread_stop(hostdata->work_thread);
2312 unmap_persist_bufs(hostdata);
2314 spin_lock(&ibmvscsi_driver_lock);
2315 list_del(&hostdata->host_list);
2316 spin_unlock(&ibmvscsi_driver_lock);
2318 scsi_host_put(hostdata->host);
2324 * ibmvscsi_resume: Resume from suspend
2325 * @dev: device struct
2327 * We may have lost an interrupt across suspend/resume, so kick the
2330 static int ibmvscsi_resume(struct device *dev)
2332 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2333 vio_disable_interrupts(to_vio_dev(hostdata->dev));
2334 tasklet_schedule(&hostdata->srp_task);
2340 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
2343 static const struct vio_device_id ibmvscsi_device_table[] = {
2344 {"vscsi", "IBM,v-scsi"},
2347 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2349 static const struct dev_pm_ops ibmvscsi_pm_ops = {
2350 .resume = ibmvscsi_resume
2353 static struct vio_driver ibmvscsi_driver = {
2354 .id_table = ibmvscsi_device_table,
2355 .probe = ibmvscsi_probe,
2356 .remove = ibmvscsi_remove,
2357 .get_desired_dma = ibmvscsi_get_desired_dma,
2359 .pm = &ibmvscsi_pm_ops,
2362 static struct srp_function_template ibmvscsi_transport_functions = {
2365 int __init ibmvscsi_module_init(void)
2369 /* Ensure we have two requests to do error recovery */
2370 driver_template.can_queue = max_requests;
2371 max_events = max_requests + 2;
2373 if (!firmware_has_feature(FW_FEATURE_VIO))
2376 ibmvscsi_transport_template =
2377 srp_attach_transport(&ibmvscsi_transport_functions);
2378 if (!ibmvscsi_transport_template)
2381 ret = vio_register_driver(&ibmvscsi_driver);
2383 srp_release_transport(ibmvscsi_transport_template);
2387 void __exit ibmvscsi_module_exit(void)
2389 vio_unregister_driver(&ibmvscsi_driver);
2390 srp_release_transport(ibmvscsi_transport_template);
2393 module_init(ibmvscsi_module_init);
2394 module_exit(ibmvscsi_module_exit);