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)
189 /* Ensure the read of the valid bit occurs before reading any
190 * other bits of the CRQ entry
195 spin_unlock_irqrestore(&queue->lock, flags);
201 * ibmvscsi_send_crq: - Send a CRQ
202 * @hostdata: the adapter
203 * @word1: the first 64 bits of the data
204 * @word2: the second 64 bits of the data
206 static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
207 u64 word1, u64 word2)
209 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
212 * Ensure the command buffer is flushed to memory before handing it
213 * over to the VIOS to prevent it from fetching any stale data.
216 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
220 * ibmvscsi_task: - Process srps asynchronously
221 * @data: ibmvscsi_host_data of host
223 static void ibmvscsi_task(void *data)
225 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
226 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
227 struct viosrp_crq *crq;
231 /* Pull all the valid messages off the CRQ */
232 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
233 ibmvscsi_handle_crq(crq, hostdata);
237 vio_enable_interrupts(vdev);
238 crq = crq_queue_next_crq(&hostdata->queue);
240 vio_disable_interrupts(vdev);
241 ibmvscsi_handle_crq(crq, hostdata);
249 static void gather_partition_info(void)
251 struct device_node *rootdn;
253 const char *ppartition_name;
254 const unsigned int *p_number_ptr;
256 /* Retrieve information about this partition */
257 rootdn = of_find_node_by_path("/");
262 ppartition_name = of_get_property(rootdn, "ibm,partition-name", NULL);
264 strncpy(partition_name, ppartition_name,
265 sizeof(partition_name));
266 p_number_ptr = of_get_property(rootdn, "ibm,partition-no", NULL);
268 partition_number = *p_number_ptr;
272 static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
274 memset(&hostdata->madapter_info, 0x00,
275 sizeof(hostdata->madapter_info));
277 dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
278 strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
280 strncpy(hostdata->madapter_info.partition_name, partition_name,
281 sizeof(hostdata->madapter_info.partition_name));
283 hostdata->madapter_info.partition_number = partition_number;
285 hostdata->madapter_info.mad_version = 1;
286 hostdata->madapter_info.os_type = 2;
290 * reset_crq_queue: - resets a crq after a failure
291 * @queue: crq_queue to initialize and register
292 * @hostdata: ibmvscsi_host_data of host
295 static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
296 struct ibmvscsi_host_data *hostdata)
299 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
305 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
306 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
308 /* Clean out the queue */
309 memset(queue->msgs, 0x00, PAGE_SIZE);
312 set_adapter_info(hostdata);
314 /* And re-open it again */
315 rc = plpar_hcall_norets(H_REG_CRQ,
317 queue->msg_token, PAGE_SIZE);
319 /* Adapter is good, but other end is not ready */
320 dev_warn(hostdata->dev, "Partner adapter not ready\n");
321 } else if (rc != 0) {
322 dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
328 * initialize_crq_queue: - Initializes and registers CRQ with hypervisor
329 * @queue: crq_queue to initialize and register
330 * @hostdata: ibmvscsi_host_data of host
332 * Allocates a page for messages, maps it for dma, and registers
333 * the crq with the hypervisor.
334 * Returns zero on success.
336 static int ibmvscsi_init_crq_queue(struct crq_queue *queue,
337 struct ibmvscsi_host_data *hostdata,
342 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
344 queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
348 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
350 queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
351 queue->size * sizeof(*queue->msgs),
354 if (dma_mapping_error(hostdata->dev, queue->msg_token))
357 gather_partition_info();
358 set_adapter_info(hostdata);
360 retrc = rc = plpar_hcall_norets(H_REG_CRQ,
362 queue->msg_token, PAGE_SIZE);
363 if (rc == H_RESOURCE)
364 /* maybe kexecing and resource is busy. try a reset */
365 rc = ibmvscsi_reset_crq_queue(queue,
369 /* Adapter is good, but other end is not ready */
370 dev_warn(hostdata->dev, "Partner adapter not ready\n");
372 } else if (rc != 0) {
373 dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
378 spin_lock_init(&queue->lock);
380 tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
381 (unsigned long)hostdata);
383 if (request_irq(vdev->irq,
384 ibmvscsi_handle_event,
385 0, "ibmvscsi", (void *)hostdata) != 0) {
386 dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
391 rc = vio_enable_interrupts(vdev);
393 dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
400 tasklet_kill(&hostdata->srp_task);
405 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
406 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
408 dma_unmap_single(hostdata->dev,
410 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
412 free_page((unsigned long)queue->msgs);
418 * reenable_crq_queue: - reenables a crq after
419 * @queue: crq_queue to initialize and register
420 * @hostdata: ibmvscsi_host_data of host
423 static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
424 struct ibmvscsi_host_data *hostdata)
427 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
429 /* Re-enable the CRQ */
433 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
434 } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
437 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
441 /* ------------------------------------------------------------
442 * Routines for the event pool and event structs
445 * initialize_event_pool: - Allocates and initializes the event pool for a host
446 * @pool: event_pool to be initialized
447 * @size: Number of events in pool
448 * @hostdata: ibmvscsi_host_data who owns the event pool
450 * Returns zero on success.
452 static int initialize_event_pool(struct event_pool *pool,
453 int size, struct ibmvscsi_host_data *hostdata)
459 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
464 dma_alloc_coherent(hostdata->dev,
465 pool->size * sizeof(*pool->iu_storage),
467 if (!pool->iu_storage) {
472 for (i = 0; i < pool->size; ++i) {
473 struct srp_event_struct *evt = &pool->events[i];
474 memset(&evt->crq, 0x00, sizeof(evt->crq));
475 atomic_set(&evt->free, 1);
476 evt->crq.valid = 0x80;
477 evt->crq.IU_length = sizeof(*evt->xfer_iu);
478 evt->crq.IU_data_ptr = pool->iu_token +
479 sizeof(*evt->xfer_iu) * i;
480 evt->xfer_iu = pool->iu_storage + i;
481 evt->hostdata = hostdata;
482 evt->ext_list = NULL;
483 evt->ext_list_token = 0;
490 * release_event_pool: - Frees memory of an event pool of a host
491 * @pool: event_pool to be released
492 * @hostdata: ibmvscsi_host_data who owns the even pool
494 * Returns zero on success.
496 static void release_event_pool(struct event_pool *pool,
497 struct ibmvscsi_host_data *hostdata)
500 for (i = 0; i < pool->size; ++i) {
501 if (atomic_read(&pool->events[i].free) != 1)
503 if (pool->events[i].ext_list) {
504 dma_free_coherent(hostdata->dev,
505 SG_ALL * sizeof(struct srp_direct_buf),
506 pool->events[i].ext_list,
507 pool->events[i].ext_list_token);
511 dev_warn(hostdata->dev, "releasing event pool with %d "
512 "events still in use?\n", in_use);
514 dma_free_coherent(hostdata->dev,
515 pool->size * sizeof(*pool->iu_storage),
516 pool->iu_storage, pool->iu_token);
520 * valid_event_struct: - Determines if event is valid.
521 * @pool: event_pool that contains the event
522 * @evt: srp_event_struct to be checked for validity
524 * Returns zero if event is invalid, one otherwise.
526 static int valid_event_struct(struct event_pool *pool,
527 struct srp_event_struct *evt)
529 int index = evt - pool->events;
530 if (index < 0 || index >= pool->size) /* outside of bounds */
532 if (evt != pool->events + index) /* unaligned */
538 * ibmvscsi_free-event_struct: - Changes status of event to "free"
539 * @pool: event_pool that contains the event
540 * @evt: srp_event_struct to be modified
543 static void free_event_struct(struct event_pool *pool,
544 struct srp_event_struct *evt)
546 if (!valid_event_struct(pool, evt)) {
547 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
548 "(not in pool %p)\n", evt, pool->events);
551 if (atomic_inc_return(&evt->free) != 1) {
552 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
553 "which is not in use!\n", evt);
559 * get_evt_struct: - Gets the next free event in pool
560 * @pool: event_pool that contains the events to be searched
562 * Returns the next event in "free" state, and NULL if none are free.
563 * Note that no synchronization is done here, we assume the host_lock
564 * will syncrhonze things.
566 static struct srp_event_struct *get_event_struct(struct event_pool *pool)
569 int poolsize = pool->size;
570 int offset = pool->next;
572 for (i = 0; i < poolsize; i++) {
573 offset = (offset + 1) % poolsize;
574 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
576 return &pool->events[offset];
580 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
585 * init_event_struct: Initialize fields in an event struct that are always
588 * @done: Routine to call when the event is responded to
589 * @format: SRP or MAD format
590 * @timeout: timeout value set in the CRQ
592 static void init_event_struct(struct srp_event_struct *evt_struct,
593 void (*done) (struct srp_event_struct *),
597 evt_struct->cmnd = NULL;
598 evt_struct->cmnd_done = NULL;
599 evt_struct->sync_srp = NULL;
600 evt_struct->crq.format = format;
601 evt_struct->crq.timeout = timeout;
602 evt_struct->done = done;
605 /* ------------------------------------------------------------
606 * Routines for receiving SCSI responses from the hosting partition
610 * set_srp_direction: Set the fields in the srp related to data
611 * direction and number of buffers based on the direction in
612 * the scsi_cmnd and the number of buffers
614 static void set_srp_direction(struct scsi_cmnd *cmd,
615 struct srp_cmd *srp_cmd,
624 fmt = SRP_DATA_DESC_DIRECT;
626 fmt = SRP_DATA_DESC_INDIRECT;
627 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
629 if (cmd->sc_data_direction == DMA_TO_DEVICE)
630 srp_cmd->data_out_desc_cnt = numbuf;
632 srp_cmd->data_in_desc_cnt = numbuf;
635 if (cmd->sc_data_direction == DMA_TO_DEVICE)
636 srp_cmd->buf_fmt = fmt << 4;
638 srp_cmd->buf_fmt = fmt;
642 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
643 * @cmd: srp_cmd whose additional_data member will be unmapped
644 * @dev: device for which the memory is mapped
647 static void unmap_cmd_data(struct srp_cmd *cmd,
648 struct srp_event_struct *evt_struct,
653 out_fmt = cmd->buf_fmt >> 4;
654 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
656 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
659 if (evt_struct->cmnd)
660 scsi_dma_unmap(evt_struct->cmnd);
663 static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
664 struct srp_direct_buf *md)
667 struct scatterlist *sg;
668 u64 total_length = 0;
670 scsi_for_each_sg(cmd, sg, nseg, i) {
671 struct srp_direct_buf *descr = md + i;
672 descr->va = sg_dma_address(sg);
673 descr->len = sg_dma_len(sg);
675 total_length += sg_dma_len(sg);
681 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
682 * @cmd: Scsi_Cmnd with the scatterlist
683 * @srp_cmd: srp_cmd that contains the memory descriptor
684 * @dev: device for which to map dma memory
686 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
687 * Returns 1 on success.
689 static int map_sg_data(struct scsi_cmnd *cmd,
690 struct srp_event_struct *evt_struct,
691 struct srp_cmd *srp_cmd, struct device *dev)
695 u64 total_length = 0;
696 struct srp_direct_buf *data =
697 (struct srp_direct_buf *) srp_cmd->add_data;
698 struct srp_indirect_buf *indirect =
699 (struct srp_indirect_buf *) data;
701 sg_mapped = scsi_dma_map(cmd);
704 else if (sg_mapped < 0)
707 set_srp_direction(cmd, srp_cmd, sg_mapped);
709 /* special case; we can use a single direct descriptor */
710 if (sg_mapped == 1) {
711 map_sg_list(cmd, sg_mapped, data);
715 indirect->table_desc.va = 0;
716 indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf);
717 indirect->table_desc.key = 0;
719 if (sg_mapped <= MAX_INDIRECT_BUFS) {
720 total_length = map_sg_list(cmd, sg_mapped,
721 &indirect->desc_list[0]);
722 indirect->len = total_length;
726 /* get indirect table */
727 if (!evt_struct->ext_list) {
728 evt_struct->ext_list = (struct srp_direct_buf *)
729 dma_alloc_coherent(dev,
730 SG_ALL * sizeof(struct srp_direct_buf),
731 &evt_struct->ext_list_token, 0);
732 if (!evt_struct->ext_list) {
733 if (!firmware_has_feature(FW_FEATURE_CMO))
734 sdev_printk(KERN_ERR, cmd->device,
735 "Can't allocate memory "
736 "for indirect table\n");
742 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
744 indirect->len = total_length;
745 indirect->table_desc.va = evt_struct->ext_list_token;
746 indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
747 memcpy(indirect->desc_list, evt_struct->ext_list,
748 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
753 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
754 * @cmd: struct scsi_cmnd with the memory to be mapped
755 * @srp_cmd: srp_cmd that contains the memory descriptor
756 * @dev: dma device for which to map dma memory
758 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
759 * Returns 1 on success.
761 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
762 struct srp_event_struct *evt_struct,
763 struct srp_cmd *srp_cmd, struct device *dev)
765 switch (cmd->sc_data_direction) {
766 case DMA_FROM_DEVICE:
771 case DMA_BIDIRECTIONAL:
772 sdev_printk(KERN_ERR, cmd->device,
773 "Can't map DMA_BIDIRECTIONAL to read/write\n");
776 sdev_printk(KERN_ERR, cmd->device,
777 "Unknown data direction 0x%02x; can't map!\n",
778 cmd->sc_data_direction);
782 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
786 * purge_requests: Our virtual adapter just shut down. purge any sent requests
787 * @hostdata: the adapter
789 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
791 struct srp_event_struct *evt;
794 spin_lock_irqsave(hostdata->host->host_lock, flags);
795 while (!list_empty(&hostdata->sent)) {
796 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
797 list_del(&evt->list);
798 del_timer(&evt->timer);
800 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
802 evt->cmnd->result = (error_code << 16);
803 unmap_cmd_data(&evt->iu.srp.cmd, evt,
806 evt->cmnd_done(evt->cmnd);
807 } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&
808 evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
810 free_event_struct(&evt->hostdata->pool, evt);
811 spin_lock_irqsave(hostdata->host->host_lock, flags);
813 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
817 * ibmvscsi_reset_host - Reset the connection to the server
818 * @hostdata: struct ibmvscsi_host_data to reset
820 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
822 scsi_block_requests(hostdata->host);
823 atomic_set(&hostdata->request_limit, 0);
825 purge_requests(hostdata, DID_ERROR);
826 hostdata->reset_crq = 1;
827 wake_up(&hostdata->work_wait_q);
831 * ibmvscsi_timeout - Internal command timeout handler
832 * @evt_struct: struct srp_event_struct that timed out
834 * Called when an internally generated command times out
836 static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
838 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
840 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
841 evt_struct->iu.srp.cmd.opcode);
843 ibmvscsi_reset_host(hostdata);
847 /* ------------------------------------------------------------
848 * Routines for sending and receiving SRPs
851 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
852 * @evt_struct: evt_struct to be sent
853 * @hostdata: ibmvscsi_host_data of host
854 * @timeout: timeout in seconds - 0 means do not time command
856 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
857 * Note that this routine assumes that host_lock is held for synchronization
859 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
860 struct ibmvscsi_host_data *hostdata,
861 unsigned long timeout)
863 u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
864 int request_status = 0;
868 /* If we have exhausted our request limit, just fail this request,
869 * unless it is for a reset or abort.
870 * Note that there are rare cases involving driver generated requests
871 * (such as task management requests) that the mid layer may think we
872 * can handle more requests (can_queue) when we actually can't
874 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
877 atomic_dec_if_positive(&hostdata->request_limit);
878 /* If request limit was -1 when we started, it is now even
881 if (request_status < -1)
883 /* Otherwise, we may have run out of requests. */
884 /* If request limit was 0 when we started the adapter is in the
885 * process of performing a login with the server adapter, or
886 * we may have run out of requests.
888 else if (request_status == -1 &&
889 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
891 /* Abort and reset calls should make it through.
892 * Nothing except abort and reset should use the last two
893 * slots unless we had two or less to begin with.
895 else if (request_status < 2 &&
896 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
897 /* In the case that we have less than two requests
898 * available, check the server limit as a combination
899 * of the request limit and the number of requests
900 * in-flight (the size of the send list). If the
901 * server limit is greater than 2, return busy so
902 * that the last two are reserved for reset and abort.
904 int server_limit = request_status;
905 struct srp_event_struct *tmp_evt;
907 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
911 if (server_limit > 2)
916 /* Copy the IU into the transfer area */
917 *evt_struct->xfer_iu = evt_struct->iu;
918 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
920 /* Add this to the sent list. We need to do this
921 * before we actually send
922 * in case it comes back REALLY fast
924 list_add_tail(&evt_struct->list, &hostdata->sent);
926 init_timer(&evt_struct->timer);
928 evt_struct->timer.data = (unsigned long) evt_struct;
929 evt_struct->timer.expires = jiffies + (timeout * HZ);
930 evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
931 add_timer(&evt_struct->timer);
935 ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
936 list_del(&evt_struct->list);
937 del_timer(&evt_struct->timer);
939 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
940 * Firmware will send a CRQ with a transport event (0xFF) to
941 * tell this client what has happened to the transport. This
942 * will be handled in ibmvscsi_handle_crq()
944 if (rc == H_CLOSED) {
945 dev_warn(hostdata->dev, "send warning. "
946 "Receive queue closed, will retry.\n");
949 dev_err(hostdata->dev, "send error %d\n", rc);
951 atomic_inc(&hostdata->request_limit);
958 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
960 free_event_struct(&hostdata->pool, evt_struct);
961 if (srp_req && request_status != -1)
962 atomic_inc(&hostdata->request_limit);
963 return SCSI_MLQUEUE_HOST_BUSY;
966 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
968 if (evt_struct->cmnd != NULL) {
969 evt_struct->cmnd->result = DID_ERROR << 16;
970 evt_struct->cmnd_done(evt_struct->cmnd);
971 } else if (evt_struct->done)
972 evt_struct->done(evt_struct);
974 free_event_struct(&hostdata->pool, evt_struct);
979 * handle_cmd_rsp: - Handle responses from commands
980 * @evt_struct: srp_event_struct to be handled
982 * Used as a callback by when sending scsi cmds.
983 * Gets called by ibmvscsi_handle_crq()
985 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
987 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
988 struct scsi_cmnd *cmnd = evt_struct->cmnd;
990 if (unlikely(rsp->opcode != SRP_RSP)) {
991 if (printk_ratelimit())
992 dev_warn(evt_struct->hostdata->dev,
993 "bad SRP RSP type %d\n", rsp->opcode);
997 cmnd->result |= rsp->status;
998 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
999 memcpy(cmnd->sense_buffer,
1001 rsp->sense_data_len);
1002 unmap_cmd_data(&evt_struct->iu.srp.cmd,
1004 evt_struct->hostdata->dev);
1006 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
1007 scsi_set_resid(cmnd, rsp->data_out_res_cnt);
1008 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
1009 scsi_set_resid(cmnd, rsp->data_in_res_cnt);
1012 if (evt_struct->cmnd_done)
1013 evt_struct->cmnd_done(cmnd);
1017 * lun_from_dev: - Returns the lun of the scsi device
1018 * @dev: struct scsi_device
1021 static inline u16 lun_from_dev(struct scsi_device *dev)
1023 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
1027 * ibmvscsi_queue: - The queuecommand function of the scsi template
1028 * @cmd: struct scsi_cmnd to be executed
1029 * @done: Callback function to be called when cmd is completed
1031 static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
1032 void (*done) (struct scsi_cmnd *))
1034 struct srp_cmd *srp_cmd;
1035 struct srp_event_struct *evt_struct;
1036 struct srp_indirect_buf *indirect;
1037 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
1038 u16 lun = lun_from_dev(cmnd->device);
1041 cmnd->result = (DID_OK << 16);
1042 evt_struct = get_event_struct(&hostdata->pool);
1044 return SCSI_MLQUEUE_HOST_BUSY;
1046 /* Set up the actual SRP IU */
1047 srp_cmd = &evt_struct->iu.srp.cmd;
1048 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
1049 srp_cmd->opcode = SRP_CMD;
1050 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
1051 srp_cmd->lun = ((u64) lun) << 48;
1053 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
1054 if (!firmware_has_feature(FW_FEATURE_CMO))
1055 sdev_printk(KERN_ERR, cmnd->device,
1056 "couldn't convert cmd to srp_cmd\n");
1057 free_event_struct(&hostdata->pool, evt_struct);
1058 return SCSI_MLQUEUE_HOST_BUSY;
1061 init_event_struct(evt_struct,
1064 cmnd->request->timeout/HZ);
1066 evt_struct->cmnd = cmnd;
1067 evt_struct->cmnd_done = done;
1069 /* Fix up dma address of the buffer itself */
1070 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
1071 out_fmt = srp_cmd->buf_fmt >> 4;
1072 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
1073 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
1074 out_fmt == SRP_DATA_DESC_INDIRECT) &&
1075 indirect->table_desc.va == 0) {
1076 indirect->table_desc.va = evt_struct->crq.IU_data_ptr +
1077 offsetof(struct srp_cmd, add_data) +
1078 offsetof(struct srp_indirect_buf, desc_list);
1081 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
1084 static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
1086 /* ------------------------------------------------------------
1087 * Routines for driver initialization
1091 * map_persist_bufs: - Pre-map persistent data for adapter logins
1092 * @hostdata: ibmvscsi_host_data of host
1094 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
1095 * Return 1 on error, 0 on success.
1097 static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
1100 hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
1101 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1103 if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
1104 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
1108 hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
1109 &hostdata->madapter_info,
1110 sizeof(hostdata->madapter_info),
1112 if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
1113 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
1114 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1115 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1123 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
1124 * @hostdata: ibmvscsi_host_data of host
1126 * Unmap the capabilities and adapter info DMA buffers
1128 static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
1130 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1131 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1133 dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
1134 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
1138 * login_rsp: - Handle response to SRP login request
1139 * @evt_struct: srp_event_struct with the response
1141 * Used as a "done" callback by when sending srp_login. Gets called
1142 * by ibmvscsi_handle_crq()
1144 static void login_rsp(struct srp_event_struct *evt_struct)
1146 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1147 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
1148 case SRP_LOGIN_RSP: /* it worked! */
1150 case SRP_LOGIN_REJ: /* refused! */
1151 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
1152 evt_struct->xfer_iu->srp.login_rej.reason);
1154 atomic_set(&hostdata->request_limit, -1);
1157 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
1158 evt_struct->xfer_iu->srp.login_rsp.opcode);
1160 atomic_set(&hostdata->request_limit, -1);
1164 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
1165 hostdata->client_migrated = 0;
1167 /* Now we know what the real request-limit is.
1168 * This value is set rather than added to request_limit because
1169 * request_limit could have been set to -1 by this client.
1171 atomic_set(&hostdata->request_limit,
1172 evt_struct->xfer_iu->srp.login_rsp.req_lim_delta);
1174 /* If we had any pending I/Os, kick them */
1175 scsi_unblock_requests(hostdata->host);
1179 * send_srp_login: - Sends the srp login
1180 * @hostdata: ibmvscsi_host_data of host
1182 * Returns zero if successful.
1184 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
1187 unsigned long flags;
1188 struct srp_login_req *login;
1189 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
1191 BUG_ON(!evt_struct);
1192 init_event_struct(evt_struct, login_rsp,
1193 VIOSRP_SRP_FORMAT, login_timeout);
1195 login = &evt_struct->iu.srp.login_req;
1196 memset(login, 0, sizeof(*login));
1197 login->opcode = SRP_LOGIN_REQ;
1198 login->req_it_iu_len = sizeof(union srp_iu);
1199 login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
1201 spin_lock_irqsave(hostdata->host->host_lock, flags);
1202 /* Start out with a request limit of 0, since this is negotiated in
1203 * the login request we are just sending and login requests always
1204 * get sent by the driver regardless of request_limit.
1206 atomic_set(&hostdata->request_limit, 0);
1208 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
1209 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1210 dev_info(hostdata->dev, "sent SRP login\n");
1215 * capabilities_rsp: - Handle response to MAD adapter capabilities request
1216 * @evt_struct: srp_event_struct with the response
1218 * Used as a "done" callback by when sending adapter_info.
1220 static void capabilities_rsp(struct srp_event_struct *evt_struct)
1222 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1224 if (evt_struct->xfer_iu->mad.capabilities.common.status) {
1225 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
1226 evt_struct->xfer_iu->mad.capabilities.common.status);
1228 if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP)
1229 dev_info(hostdata->dev, "Partition migration not supported\n");
1231 if (client_reserve) {
1232 if (hostdata->caps.reserve.common.server_support ==
1233 SERVER_SUPPORTS_CAP)
1234 dev_info(hostdata->dev, "Client reserve enabled\n");
1236 dev_info(hostdata->dev, "Client reserve not supported\n");
1240 send_srp_login(hostdata);
1244 * send_mad_capabilities: - Sends the mad capabilities request
1245 * and stores the result so it can be retrieved with
1246 * @hostdata: ibmvscsi_host_data of host
1248 static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
1250 struct viosrp_capabilities *req;
1251 struct srp_event_struct *evt_struct;
1252 unsigned long flags;
1253 struct device_node *of_node = hostdata->dev->of_node;
1254 const char *location;
1256 evt_struct = get_event_struct(&hostdata->pool);
1257 BUG_ON(!evt_struct);
1259 init_event_struct(evt_struct, capabilities_rsp,
1260 VIOSRP_MAD_FORMAT, info_timeout);
1262 req = &evt_struct->iu.mad.capabilities;
1263 memset(req, 0, sizeof(*req));
1265 hostdata->caps.flags = CAP_LIST_SUPPORTED;
1266 if (hostdata->client_migrated)
1267 hostdata->caps.flags |= CLIENT_MIGRATED;
1269 strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
1270 sizeof(hostdata->caps.name));
1271 hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0';
1273 location = of_get_property(of_node, "ibm,loc-code", NULL);
1274 location = location ? location : dev_name(hostdata->dev);
1275 strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
1276 hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0';
1278 req->common.type = VIOSRP_CAPABILITIES_TYPE;
1279 req->buffer = hostdata->caps_addr;
1281 hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES;
1282 hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration);
1283 hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP;
1284 hostdata->caps.migration.ecl = 1;
1286 if (client_reserve) {
1287 hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES;
1288 hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve);
1289 hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP;
1290 hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2;
1291 req->common.length = sizeof(hostdata->caps);
1293 req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve);
1295 spin_lock_irqsave(hostdata->host->host_lock, flags);
1296 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1297 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
1298 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1302 * fast_fail_rsp: - Handle response to MAD enable fast fail
1303 * @evt_struct: srp_event_struct with the response
1305 * Used as a "done" callback by when sending enable fast fail. Gets called
1306 * by ibmvscsi_handle_crq()
1308 static void fast_fail_rsp(struct srp_event_struct *evt_struct)
1310 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1311 u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status;
1313 if (status == VIOSRP_MAD_NOT_SUPPORTED)
1314 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1315 else if (status == VIOSRP_MAD_FAILED)
1316 dev_err(hostdata->dev, "fast_fail request failed\n");
1317 else if (status != VIOSRP_MAD_SUCCESS)
1318 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1320 send_mad_capabilities(hostdata);
1324 * init_host - Start host initialization
1325 * @hostdata: ibmvscsi_host_data of host
1327 * Returns zero if successful.
1329 static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1332 unsigned long flags;
1333 struct viosrp_fast_fail *fast_fail_mad;
1334 struct srp_event_struct *evt_struct;
1337 send_mad_capabilities(hostdata);
1341 evt_struct = get_event_struct(&hostdata->pool);
1342 BUG_ON(!evt_struct);
1344 init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1346 fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1347 memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1348 fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL;
1349 fast_fail_mad->common.length = sizeof(*fast_fail_mad);
1351 spin_lock_irqsave(hostdata->host->host_lock, flags);
1352 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1353 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1358 * adapter_info_rsp: - Handle response to MAD adapter info request
1359 * @evt_struct: srp_event_struct with the response
1361 * Used as a "done" callback by when sending adapter_info. Gets called
1362 * by ibmvscsi_handle_crq()
1364 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1366 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1368 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1369 dev_err(hostdata->dev, "error %d getting adapter info\n",
1370 evt_struct->xfer_iu->mad.adapter_info.common.status);
1372 dev_info(hostdata->dev, "host srp version: %s, "
1373 "host partition %s (%d), OS %d, max io %u\n",
1374 hostdata->madapter_info.srp_version,
1375 hostdata->madapter_info.partition_name,
1376 hostdata->madapter_info.partition_number,
1377 hostdata->madapter_info.os_type,
1378 hostdata->madapter_info.port_max_txu[0]);
1380 if (hostdata->madapter_info.port_max_txu[0])
1381 hostdata->host->max_sectors =
1382 hostdata->madapter_info.port_max_txu[0] >> 9;
1384 if (hostdata->madapter_info.os_type == 3 &&
1385 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1386 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1387 hostdata->madapter_info.srp_version);
1388 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1390 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1393 if (hostdata->madapter_info.os_type == 3) {
1394 enable_fast_fail(hostdata);
1399 send_srp_login(hostdata);
1403 * send_mad_adapter_info: - Sends the mad adapter info request
1404 * and stores the result so it can be retrieved with
1405 * sysfs. We COULD consider causing a failure if the
1406 * returned SRP version doesn't match ours.
1407 * @hostdata: ibmvscsi_host_data of host
1409 * Returns zero if successful.
1411 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1413 struct viosrp_adapter_info *req;
1414 struct srp_event_struct *evt_struct;
1415 unsigned long flags;
1417 evt_struct = get_event_struct(&hostdata->pool);
1418 BUG_ON(!evt_struct);
1420 init_event_struct(evt_struct,
1425 req = &evt_struct->iu.mad.adapter_info;
1426 memset(req, 0x00, sizeof(*req));
1428 req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
1429 req->common.length = sizeof(hostdata->madapter_info);
1430 req->buffer = hostdata->adapter_info_addr;
1432 spin_lock_irqsave(hostdata->host->host_lock, flags);
1433 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1434 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1435 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1439 * init_adapter: Start virtual adapter initialization sequence
1442 static void init_adapter(struct ibmvscsi_host_data *hostdata)
1444 send_mad_adapter_info(hostdata);
1448 * sync_completion: Signal that a synchronous command has completed
1449 * Note that after returning from this call, the evt_struct is freed.
1450 * the caller waiting on this completion shouldn't touch the evt_struct
1453 static void sync_completion(struct srp_event_struct *evt_struct)
1455 /* copy the response back */
1456 if (evt_struct->sync_srp)
1457 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1459 complete(&evt_struct->comp);
1463 * ibmvscsi_abort: Abort a command...from scsi host template
1464 * send this over to the server and wait synchronously for the response
1466 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1468 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1469 struct srp_tsk_mgmt *tsk_mgmt;
1470 struct srp_event_struct *evt;
1471 struct srp_event_struct *tmp_evt, *found_evt;
1472 union viosrp_iu srp_rsp;
1474 unsigned long flags;
1475 u16 lun = lun_from_dev(cmd->device);
1476 unsigned long wait_switch = 0;
1478 /* First, find this command in our sent list so we can figure
1479 * out the correct tag
1481 spin_lock_irqsave(hostdata->host->host_lock, flags);
1482 wait_switch = jiffies + (init_timeout * HZ);
1485 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1486 if (tmp_evt->cmnd == cmd) {
1487 found_evt = tmp_evt;
1493 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1497 evt = get_event_struct(&hostdata->pool);
1499 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1500 sdev_printk(KERN_ERR, cmd->device,
1501 "failed to allocate abort event\n");
1505 init_event_struct(evt,
1510 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1512 /* Set up an abort SRP command */
1513 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1514 tsk_mgmt->opcode = SRP_TSK_MGMT;
1515 tsk_mgmt->lun = ((u64) lun) << 48;
1516 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1517 tsk_mgmt->task_tag = (u64) found_evt;
1519 evt->sync_srp = &srp_rsp;
1521 init_completion(&evt->comp);
1522 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1524 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1527 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1529 spin_lock_irqsave(hostdata->host->host_lock, flags);
1530 } while (time_before(jiffies, wait_switch));
1532 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1535 sdev_printk(KERN_ERR, cmd->device,
1536 "failed to send abort() event. rc=%d\n", rsp_rc);
1540 sdev_printk(KERN_INFO, cmd->device,
1541 "aborting command. lun 0x%llx, tag 0x%llx\n",
1542 (((u64) lun) << 48), (u64) found_evt);
1544 wait_for_completion(&evt->comp);
1546 /* make sure we got a good response */
1547 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1548 if (printk_ratelimit())
1549 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1550 srp_rsp.srp.rsp.opcode);
1554 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1555 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1557 rsp_rc = srp_rsp.srp.rsp.status;
1560 if (printk_ratelimit())
1561 sdev_printk(KERN_WARNING, cmd->device,
1562 "abort code %d for task tag 0x%llx\n",
1563 rsp_rc, tsk_mgmt->task_tag);
1567 /* Because we dropped the spinlock above, it's possible
1568 * The event is no longer in our list. Make sure it didn't
1569 * complete while we were aborting
1571 spin_lock_irqsave(hostdata->host->host_lock, flags);
1573 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1574 if (tmp_evt->cmnd == cmd) {
1575 found_evt = tmp_evt;
1580 if (found_evt == NULL) {
1581 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1582 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1583 tsk_mgmt->task_tag);
1587 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1588 tsk_mgmt->task_tag);
1590 cmd->result = (DID_ABORT << 16);
1591 list_del(&found_evt->list);
1592 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1593 found_evt->hostdata->dev);
1594 free_event_struct(&found_evt->hostdata->pool, found_evt);
1595 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1596 atomic_inc(&hostdata->request_limit);
1601 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1602 * template send this over to the server and wait synchronously for the
1605 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1607 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1608 struct srp_tsk_mgmt *tsk_mgmt;
1609 struct srp_event_struct *evt;
1610 struct srp_event_struct *tmp_evt, *pos;
1611 union viosrp_iu srp_rsp;
1613 unsigned long flags;
1614 u16 lun = lun_from_dev(cmd->device);
1615 unsigned long wait_switch = 0;
1617 spin_lock_irqsave(hostdata->host->host_lock, flags);
1618 wait_switch = jiffies + (init_timeout * HZ);
1620 evt = get_event_struct(&hostdata->pool);
1622 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1623 sdev_printk(KERN_ERR, cmd->device,
1624 "failed to allocate reset event\n");
1628 init_event_struct(evt,
1633 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1635 /* Set up a lun reset SRP command */
1636 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1637 tsk_mgmt->opcode = SRP_TSK_MGMT;
1638 tsk_mgmt->lun = ((u64) lun) << 48;
1639 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1641 evt->sync_srp = &srp_rsp;
1643 init_completion(&evt->comp);
1644 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1646 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1649 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1651 spin_lock_irqsave(hostdata->host->host_lock, flags);
1652 } while (time_before(jiffies, wait_switch));
1654 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1657 sdev_printk(KERN_ERR, cmd->device,
1658 "failed to send reset event. rc=%d\n", rsp_rc);
1662 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1663 (((u64) lun) << 48));
1665 wait_for_completion(&evt->comp);
1667 /* make sure we got a good response */
1668 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1669 if (printk_ratelimit())
1670 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1671 srp_rsp.srp.rsp.opcode);
1675 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1676 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1678 rsp_rc = srp_rsp.srp.rsp.status;
1681 if (printk_ratelimit())
1682 sdev_printk(KERN_WARNING, cmd->device,
1683 "reset code %d for task tag 0x%llx\n",
1684 rsp_rc, tsk_mgmt->task_tag);
1688 /* We need to find all commands for this LUN that have not yet been
1689 * responded to, and fail them with DID_RESET
1691 spin_lock_irqsave(hostdata->host->host_lock, flags);
1692 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1693 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1695 tmp_evt->cmnd->result = (DID_RESET << 16);
1696 list_del(&tmp_evt->list);
1697 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1698 tmp_evt->hostdata->dev);
1699 free_event_struct(&tmp_evt->hostdata->pool,
1701 atomic_inc(&hostdata->request_limit);
1702 if (tmp_evt->cmnd_done)
1703 tmp_evt->cmnd_done(tmp_evt->cmnd);
1704 else if (tmp_evt->done)
1705 tmp_evt->done(tmp_evt);
1708 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1713 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1714 * @cmd: struct scsi_cmnd having problems
1716 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1718 unsigned long wait_switch = 0;
1719 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1721 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1723 ibmvscsi_reset_host(hostdata);
1725 for (wait_switch = jiffies + (init_timeout * HZ);
1726 time_before(jiffies, wait_switch) &&
1727 atomic_read(&hostdata->request_limit) < 2;) {
1732 if (atomic_read(&hostdata->request_limit) <= 0)
1739 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1740 * @crq: Command/Response queue
1741 * @hostdata: ibmvscsi_host_data of host
1744 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1745 struct ibmvscsi_host_data *hostdata)
1748 unsigned long flags;
1749 struct srp_event_struct *evt_struct =
1750 (struct srp_event_struct *)crq->IU_data_ptr;
1751 switch (crq->valid) {
1752 case 0xC0: /* initialization */
1753 switch (crq->format) {
1754 case 0x01: /* Initialization message */
1755 dev_info(hostdata->dev, "partner initialized\n");
1756 /* Send back a response */
1757 rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
1760 init_adapter(hostdata);
1762 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1766 case 0x02: /* Initialization response */
1767 dev_info(hostdata->dev, "partner initialization complete\n");
1770 init_adapter(hostdata);
1773 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1776 case 0xFF: /* Hypervisor telling us the connection is closed */
1777 scsi_block_requests(hostdata->host);
1778 atomic_set(&hostdata->request_limit, 0);
1779 if (crq->format == 0x06) {
1780 /* We need to re-setup the interpartition connection */
1781 dev_info(hostdata->dev, "Re-enabling adapter!\n");
1782 hostdata->client_migrated = 1;
1783 hostdata->reenable_crq = 1;
1784 purge_requests(hostdata, DID_REQUEUE);
1785 wake_up(&hostdata->work_wait_q);
1787 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1789 ibmvscsi_reset_host(hostdata);
1792 case 0x80: /* real payload */
1795 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1800 /* The only kind of payload CRQs we should get are responses to
1801 * things we send. Make sure this response is to something we
1804 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1805 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1806 (void *)crq->IU_data_ptr);
1810 if (atomic_read(&evt_struct->free)) {
1811 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1812 (void *)crq->IU_data_ptr);
1816 if (crq->format == VIOSRP_SRP_FORMAT)
1817 atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta,
1818 &hostdata->request_limit);
1820 del_timer(&evt_struct->timer);
1822 if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1823 evt_struct->cmnd->result = DID_ERROR << 16;
1824 if (evt_struct->done)
1825 evt_struct->done(evt_struct);
1827 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1830 * Lock the host_lock before messing with these structures, since we
1831 * are running in a task context
1833 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1834 list_del(&evt_struct->list);
1835 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1836 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1840 * ibmvscsi_get_host_config: Send the command to the server to get host
1841 * configuration data. The data is opaque to us.
1843 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1844 unsigned char *buffer, int length)
1846 struct viosrp_host_config *host_config;
1847 struct srp_event_struct *evt_struct;
1848 unsigned long flags;
1852 evt_struct = get_event_struct(&hostdata->pool);
1854 dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n");
1858 init_event_struct(evt_struct,
1863 host_config = &evt_struct->iu.mad.host_config;
1865 /* The transport length field is only 16-bit */
1866 length = min(0xffff, length);
1868 /* Set up a lun reset SRP command */
1869 memset(host_config, 0x00, sizeof(*host_config));
1870 host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1871 host_config->common.length = length;
1872 host_config->buffer = addr = dma_map_single(hostdata->dev, buffer,
1876 if (dma_mapping_error(hostdata->dev, host_config->buffer)) {
1877 if (!firmware_has_feature(FW_FEATURE_CMO))
1878 dev_err(hostdata->dev,
1879 "dma_mapping error getting host config\n");
1880 free_event_struct(&hostdata->pool, evt_struct);
1884 init_completion(&evt_struct->comp);
1885 spin_lock_irqsave(hostdata->host->host_lock, flags);
1886 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1887 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1889 wait_for_completion(&evt_struct->comp);
1890 dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);
1896 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1897 * @sdev: struct scsi_device device to configure
1899 * Enable allow_restart for a device if it is a disk. Adjust the
1900 * queue_depth here also as is required by the documentation for
1901 * struct scsi_host_template.
1903 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1905 struct Scsi_Host *shost = sdev->host;
1906 unsigned long lock_flags = 0;
1908 spin_lock_irqsave(shost->host_lock, lock_flags);
1909 if (sdev->type == TYPE_DISK) {
1910 sdev->allow_restart = 1;
1911 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1913 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1914 scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun);
1919 * ibmvscsi_change_queue_depth - Change the device's queue depth
1920 * @sdev: scsi device struct
1921 * @qdepth: depth to set
1922 * @reason: calling context
1927 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth,
1930 if (reason != SCSI_QDEPTH_DEFAULT)
1933 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1934 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1936 scsi_adjust_queue_depth(sdev, 0, qdepth);
1937 return sdev->queue_depth;
1940 /* ------------------------------------------------------------
1943 static ssize_t show_host_vhost_loc(struct device *dev,
1944 struct device_attribute *attr, char *buf)
1946 struct Scsi_Host *shost = class_to_shost(dev);
1947 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1950 len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1951 hostdata->caps.loc);
1955 static struct device_attribute ibmvscsi_host_vhost_loc = {
1957 .name = "vhost_loc",
1960 .show = show_host_vhost_loc,
1963 static ssize_t show_host_vhost_name(struct device *dev,
1964 struct device_attribute *attr, char *buf)
1966 struct Scsi_Host *shost = class_to_shost(dev);
1967 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1970 len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1971 hostdata->caps.name);
1975 static struct device_attribute ibmvscsi_host_vhost_name = {
1977 .name = "vhost_name",
1980 .show = show_host_vhost_name,
1983 static ssize_t show_host_srp_version(struct device *dev,
1984 struct device_attribute *attr, char *buf)
1986 struct Scsi_Host *shost = class_to_shost(dev);
1987 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1990 len = snprintf(buf, PAGE_SIZE, "%s\n",
1991 hostdata->madapter_info.srp_version);
1995 static struct device_attribute ibmvscsi_host_srp_version = {
1997 .name = "srp_version",
2000 .show = show_host_srp_version,
2003 static ssize_t show_host_partition_name(struct device *dev,
2004 struct device_attribute *attr,
2007 struct Scsi_Host *shost = class_to_shost(dev);
2008 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2011 len = snprintf(buf, PAGE_SIZE, "%s\n",
2012 hostdata->madapter_info.partition_name);
2016 static struct device_attribute ibmvscsi_host_partition_name = {
2018 .name = "partition_name",
2021 .show = show_host_partition_name,
2024 static ssize_t show_host_partition_number(struct device *dev,
2025 struct device_attribute *attr,
2028 struct Scsi_Host *shost = class_to_shost(dev);
2029 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2032 len = snprintf(buf, PAGE_SIZE, "%d\n",
2033 hostdata->madapter_info.partition_number);
2037 static struct device_attribute ibmvscsi_host_partition_number = {
2039 .name = "partition_number",
2042 .show = show_host_partition_number,
2045 static ssize_t show_host_mad_version(struct device *dev,
2046 struct device_attribute *attr, char *buf)
2048 struct Scsi_Host *shost = class_to_shost(dev);
2049 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2052 len = snprintf(buf, PAGE_SIZE, "%d\n",
2053 hostdata->madapter_info.mad_version);
2057 static struct device_attribute ibmvscsi_host_mad_version = {
2059 .name = "mad_version",
2062 .show = show_host_mad_version,
2065 static ssize_t show_host_os_type(struct device *dev,
2066 struct device_attribute *attr, char *buf)
2068 struct Scsi_Host *shost = class_to_shost(dev);
2069 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2072 len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
2076 static struct device_attribute ibmvscsi_host_os_type = {
2081 .show = show_host_os_type,
2084 static ssize_t show_host_config(struct device *dev,
2085 struct device_attribute *attr, char *buf)
2087 struct Scsi_Host *shost = class_to_shost(dev);
2088 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2090 /* returns null-terminated host config data */
2091 if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
2097 static struct device_attribute ibmvscsi_host_config = {
2102 .show = show_host_config,
2105 static struct device_attribute *ibmvscsi_attrs[] = {
2106 &ibmvscsi_host_vhost_loc,
2107 &ibmvscsi_host_vhost_name,
2108 &ibmvscsi_host_srp_version,
2109 &ibmvscsi_host_partition_name,
2110 &ibmvscsi_host_partition_number,
2111 &ibmvscsi_host_mad_version,
2112 &ibmvscsi_host_os_type,
2113 &ibmvscsi_host_config,
2117 /* ------------------------------------------------------------
2118 * SCSI driver registration
2120 static struct scsi_host_template driver_template = {
2121 .module = THIS_MODULE,
2122 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
2123 .proc_name = "ibmvscsi",
2124 .queuecommand = ibmvscsi_queuecommand,
2125 .eh_abort_handler = ibmvscsi_eh_abort_handler,
2126 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
2127 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
2128 .slave_configure = ibmvscsi_slave_configure,
2129 .change_queue_depth = ibmvscsi_change_queue_depth,
2130 .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
2131 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
2133 .sg_tablesize = SG_ALL,
2134 .use_clustering = ENABLE_CLUSTERING,
2135 .shost_attrs = ibmvscsi_attrs,
2139 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
2141 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
2144 * Number of bytes of IO data the driver will need to perform well.
2146 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
2148 /* iu_storage data allocated in initialize_event_pool */
2149 unsigned long desired_io = max_events * sizeof(union viosrp_iu);
2151 /* add io space for sg data */
2152 desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
2153 IBMVSCSI_CMDS_PER_LUN_DEFAULT);
2158 static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
2161 char *action = "reset";
2163 if (hostdata->reset_crq) {
2165 hostdata->reset_crq = 0;
2167 rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
2169 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2170 vio_enable_interrupts(to_vio_dev(hostdata->dev));
2171 } else if (hostdata->reenable_crq) {
2174 rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
2175 hostdata->reenable_crq = 0;
2177 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2182 atomic_set(&hostdata->request_limit, -1);
2183 dev_err(hostdata->dev, "error after %s\n", action);
2186 scsi_unblock_requests(hostdata->host);
2189 static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2191 if (kthread_should_stop())
2193 else if (hostdata->reset_crq) {
2196 } else if (hostdata->reenable_crq) {
2204 static int ibmvscsi_work(void *data)
2206 struct ibmvscsi_host_data *hostdata = data;
2209 set_user_nice(current, -20);
2212 rc = wait_event_interruptible(hostdata->work_wait_q,
2213 ibmvscsi_work_to_do(hostdata));
2217 if (kthread_should_stop())
2220 ibmvscsi_do_work(hostdata);
2227 * Called by bus code for each adapter
2229 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2231 struct ibmvscsi_host_data *hostdata;
2232 struct Scsi_Host *host;
2233 struct device *dev = &vdev->dev;
2234 struct srp_rport_identifiers ids;
2235 struct srp_rport *rport;
2236 unsigned long wait_switch = 0;
2239 dev_set_drvdata(&vdev->dev, NULL);
2241 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
2243 dev_err(&vdev->dev, "couldn't allocate host data\n");
2244 goto scsi_host_alloc_failed;
2247 host->transportt = ibmvscsi_transport_template;
2248 hostdata = shost_priv(host);
2249 memset(hostdata, 0x00, sizeof(*hostdata));
2250 INIT_LIST_HEAD(&hostdata->sent);
2251 init_waitqueue_head(&hostdata->work_wait_q);
2252 hostdata->host = host;
2253 hostdata->dev = dev;
2254 atomic_set(&hostdata->request_limit, -1);
2255 hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
2257 if (map_persist_bufs(hostdata)) {
2258 dev_err(&vdev->dev, "couldn't map persistent buffers\n");
2259 goto persist_bufs_failed;
2262 hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
2263 "ibmvscsi", host->host_no);
2265 if (IS_ERR(hostdata->work_thread)) {
2266 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
2267 PTR_ERR(hostdata->work_thread));
2268 goto init_crq_failed;
2271 rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
2272 if (rc != 0 && rc != H_RESOURCE) {
2273 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
2276 if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
2277 dev_err(&vdev->dev, "couldn't initialize event pool\n");
2278 goto init_pool_failed;
2282 host->max_id = max_id;
2283 host->max_channel = max_channel;
2284 host->max_cmd_len = 16;
2286 if (scsi_add_host(hostdata->host, hostdata->dev))
2287 goto add_host_failed;
2289 /* we don't have a proper target_port_id so let's use the fake one */
2290 memcpy(ids.port_id, hostdata->madapter_info.partition_name,
2291 sizeof(ids.port_id));
2292 ids.roles = SRP_RPORT_ROLE_TARGET;
2293 rport = srp_rport_add(host, &ids);
2295 goto add_srp_port_failed;
2297 /* Try to send an initialization message. Note that this is allowed
2298 * to fail if the other end is not acive. In that case we don't
2301 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
2302 || rc == H_RESOURCE) {
2304 * Wait around max init_timeout secs for the adapter to finish
2305 * initializing. When we are done initializing, we will have a
2306 * valid request_limit. We don't want Linux scanning before
2309 for (wait_switch = jiffies + (init_timeout * HZ);
2310 time_before(jiffies, wait_switch) &&
2311 atomic_read(&hostdata->request_limit) < 2;) {
2316 /* if we now have a valid request_limit, initiate a scan */
2317 if (atomic_read(&hostdata->request_limit) > 0)
2318 scsi_scan_host(host);
2321 dev_set_drvdata(&vdev->dev, hostdata);
2324 add_srp_port_failed:
2325 scsi_remove_host(hostdata->host);
2327 release_event_pool(&hostdata->pool, hostdata);
2329 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
2331 kthread_stop(hostdata->work_thread);
2333 unmap_persist_bufs(hostdata);
2334 persist_bufs_failed:
2335 scsi_host_put(host);
2336 scsi_host_alloc_failed:
2340 static int ibmvscsi_remove(struct vio_dev *vdev)
2342 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2343 unmap_persist_bufs(hostdata);
2344 release_event_pool(&hostdata->pool, hostdata);
2345 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
2348 kthread_stop(hostdata->work_thread);
2349 srp_remove_host(hostdata->host);
2350 scsi_remove_host(hostdata->host);
2351 scsi_host_put(hostdata->host);
2357 * ibmvscsi_resume: Resume from suspend
2358 * @dev: device struct
2360 * We may have lost an interrupt across suspend/resume, so kick the
2363 static int ibmvscsi_resume(struct device *dev)
2365 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2366 vio_disable_interrupts(to_vio_dev(hostdata->dev));
2367 tasklet_schedule(&hostdata->srp_task);
2373 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
2376 static struct vio_device_id ibmvscsi_device_table[] = {
2377 {"vscsi", "IBM,v-scsi"},
2380 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2382 static struct dev_pm_ops ibmvscsi_pm_ops = {
2383 .resume = ibmvscsi_resume
2386 static struct vio_driver ibmvscsi_driver = {
2387 .id_table = ibmvscsi_device_table,
2388 .probe = ibmvscsi_probe,
2389 .remove = ibmvscsi_remove,
2390 .get_desired_dma = ibmvscsi_get_desired_dma,
2392 .pm = &ibmvscsi_pm_ops,
2395 static struct srp_function_template ibmvscsi_transport_functions = {
2398 int __init ibmvscsi_module_init(void)
2402 /* Ensure we have two requests to do error recovery */
2403 driver_template.can_queue = max_requests;
2404 max_events = max_requests + 2;
2406 if (!firmware_has_feature(FW_FEATURE_VIO))
2409 ibmvscsi_transport_template =
2410 srp_attach_transport(&ibmvscsi_transport_functions);
2411 if (!ibmvscsi_transport_template)
2414 ret = vio_register_driver(&ibmvscsi_driver);
2416 srp_release_transport(ibmvscsi_transport_template);
2420 void __exit ibmvscsi_module_exit(void)
2422 vio_unregister_driver(&ibmvscsi_driver);
2423 srp_release_transport(ibmvscsi_transport_template);
2426 module_init(ibmvscsi_module_init);
2427 module_exit(ibmvscsi_module_exit);