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-robbin 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 * Note that some of the underlying infrastructure is different between
59 * machines conforming to the "RS/6000 Platform Architecture" (RPA) and
60 * the older iSeries hypervisor models. To support both, some low level
61 * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c.
62 * The Makefile should pick one, not two, not zero, of these.
64 * TODO: This is currently pretty tied to the IBM i/pSeries hypervisor
65 * interfaces. It would be really nice to abstract this above an RDMA
69 #include <linux/module.h>
70 #include <linux/moduleparam.h>
71 #include <linux/dma-mapping.h>
72 #include <linux/delay.h>
74 #include <scsi/scsi.h>
75 #include <scsi/scsi_cmnd.h>
76 #include <scsi/scsi_host.h>
77 #include <scsi/scsi_device.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 = 5;
88 static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
90 #define IBMVSCSI_VERSION "1.5.8"
92 MODULE_DESCRIPTION("IBM Virtual SCSI");
93 MODULE_AUTHOR("Dave Boutcher");
94 MODULE_LICENSE("GPL");
95 MODULE_VERSION(IBMVSCSI_VERSION);
97 module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
98 MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
99 module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
100 MODULE_PARM_DESC(max_channel, "Largest channel value");
101 module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
102 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
103 module_param_named(max_requests, max_requests, int, S_IRUGO | S_IWUSR);
104 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
106 /* ------------------------------------------------------------
107 * Routines for the event pool and event structs
110 * initialize_event_pool: - Allocates and initializes the event pool for a host
111 * @pool: event_pool to be initialized
112 * @size: Number of events in pool
113 * @hostdata: ibmvscsi_host_data who owns the event pool
115 * Returns zero on success.
117 static int initialize_event_pool(struct event_pool *pool,
118 int size, struct ibmvscsi_host_data *hostdata)
124 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
129 dma_alloc_coherent(hostdata->dev,
130 pool->size * sizeof(*pool->iu_storage),
132 if (!pool->iu_storage) {
137 for (i = 0; i < pool->size; ++i) {
138 struct srp_event_struct *evt = &pool->events[i];
139 memset(&evt->crq, 0x00, sizeof(evt->crq));
140 atomic_set(&evt->free, 1);
141 evt->crq.valid = 0x80;
142 evt->crq.IU_length = sizeof(*evt->xfer_iu);
143 evt->crq.IU_data_ptr = pool->iu_token +
144 sizeof(*evt->xfer_iu) * i;
145 evt->xfer_iu = pool->iu_storage + i;
146 evt->hostdata = hostdata;
147 evt->ext_list = NULL;
148 evt->ext_list_token = 0;
155 * release_event_pool: - Frees memory of an event pool of a host
156 * @pool: event_pool to be released
157 * @hostdata: ibmvscsi_host_data who owns the even pool
159 * Returns zero on success.
161 static void release_event_pool(struct event_pool *pool,
162 struct ibmvscsi_host_data *hostdata)
165 for (i = 0; i < pool->size; ++i) {
166 if (atomic_read(&pool->events[i].free) != 1)
168 if (pool->events[i].ext_list) {
169 dma_free_coherent(hostdata->dev,
170 SG_ALL * sizeof(struct srp_direct_buf),
171 pool->events[i].ext_list,
172 pool->events[i].ext_list_token);
176 dev_warn(hostdata->dev, "releasing event pool with %d "
177 "events still in use?\n", in_use);
179 dma_free_coherent(hostdata->dev,
180 pool->size * sizeof(*pool->iu_storage),
181 pool->iu_storage, pool->iu_token);
185 * valid_event_struct: - Determines if event is valid.
186 * @pool: event_pool that contains the event
187 * @evt: srp_event_struct to be checked for validity
189 * Returns zero if event is invalid, one otherwise.
191 static int valid_event_struct(struct event_pool *pool,
192 struct srp_event_struct *evt)
194 int index = evt - pool->events;
195 if (index < 0 || index >= pool->size) /* outside of bounds */
197 if (evt != pool->events + index) /* unaligned */
203 * ibmvscsi_free-event_struct: - Changes status of event to "free"
204 * @pool: event_pool that contains the event
205 * @evt: srp_event_struct to be modified
208 static void free_event_struct(struct event_pool *pool,
209 struct srp_event_struct *evt)
211 if (!valid_event_struct(pool, evt)) {
212 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
213 "(not in pool %p)\n", evt, pool->events);
216 if (atomic_inc_return(&evt->free) != 1) {
217 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
218 "which is not in use!\n", evt);
224 * get_evt_struct: - Gets the next free event in pool
225 * @pool: event_pool that contains the events to be searched
227 * Returns the next event in "free" state, and NULL if none are free.
228 * Note that no synchronization is done here, we assume the host_lock
229 * will syncrhonze things.
231 static struct srp_event_struct *get_event_struct(struct event_pool *pool)
234 int poolsize = pool->size;
235 int offset = pool->next;
237 for (i = 0; i < poolsize; i++) {
238 offset = (offset + 1) % poolsize;
239 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
241 return &pool->events[offset];
245 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
250 * init_event_struct: Initialize fields in an event struct that are always
253 * @done: Routine to call when the event is responded to
254 * @format: SRP or MAD format
255 * @timeout: timeout value set in the CRQ
257 static void init_event_struct(struct srp_event_struct *evt_struct,
258 void (*done) (struct srp_event_struct *),
262 evt_struct->cmnd = NULL;
263 evt_struct->cmnd_done = NULL;
264 evt_struct->sync_srp = NULL;
265 evt_struct->crq.format = format;
266 evt_struct->crq.timeout = timeout;
267 evt_struct->done = done;
270 /* ------------------------------------------------------------
271 * Routines for receiving SCSI responses from the hosting partition
275 * set_srp_direction: Set the fields in the srp related to data
276 * direction and number of buffers based on the direction in
277 * the scsi_cmnd and the number of buffers
279 static void set_srp_direction(struct scsi_cmnd *cmd,
280 struct srp_cmd *srp_cmd,
289 fmt = SRP_DATA_DESC_DIRECT;
291 fmt = SRP_DATA_DESC_INDIRECT;
292 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
294 if (cmd->sc_data_direction == DMA_TO_DEVICE)
295 srp_cmd->data_out_desc_cnt = numbuf;
297 srp_cmd->data_in_desc_cnt = numbuf;
300 if (cmd->sc_data_direction == DMA_TO_DEVICE)
301 srp_cmd->buf_fmt = fmt << 4;
303 srp_cmd->buf_fmt = fmt;
306 static void unmap_sg_list(int num_entries,
308 struct srp_direct_buf *md)
312 for (i = 0; i < num_entries; ++i)
313 dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL);
317 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
318 * @cmd: srp_cmd whose additional_data member will be unmapped
319 * @dev: device for which the memory is mapped
322 static void unmap_cmd_data(struct srp_cmd *cmd,
323 struct srp_event_struct *evt_struct,
328 out_fmt = cmd->buf_fmt >> 4;
329 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
331 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
333 else if (out_fmt == SRP_DATA_DESC_DIRECT ||
334 in_fmt == SRP_DATA_DESC_DIRECT) {
335 struct srp_direct_buf *data =
336 (struct srp_direct_buf *) cmd->add_data;
337 dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL);
339 struct srp_indirect_buf *indirect =
340 (struct srp_indirect_buf *) cmd->add_data;
341 int num_mapped = indirect->table_desc.len /
342 sizeof(struct srp_direct_buf);
344 if (num_mapped <= MAX_INDIRECT_BUFS) {
345 unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]);
349 unmap_sg_list(num_mapped, dev, evt_struct->ext_list);
353 static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
354 struct srp_direct_buf *md)
357 struct scatterlist *sg;
358 u64 total_length = 0;
360 scsi_for_each_sg(cmd, sg, nseg, i) {
361 struct srp_direct_buf *descr = md + i;
362 descr->va = sg_dma_address(sg);
363 descr->len = sg_dma_len(sg);
365 total_length += sg_dma_len(sg);
371 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
372 * @cmd: Scsi_Cmnd with the scatterlist
373 * @srp_cmd: srp_cmd that contains the memory descriptor
374 * @dev: device for which to map dma memory
376 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
377 * Returns 1 on success.
379 static int map_sg_data(struct scsi_cmnd *cmd,
380 struct srp_event_struct *evt_struct,
381 struct srp_cmd *srp_cmd, struct device *dev)
385 u64 total_length = 0;
386 struct srp_direct_buf *data =
387 (struct srp_direct_buf *) srp_cmd->add_data;
388 struct srp_indirect_buf *indirect =
389 (struct srp_indirect_buf *) data;
391 sg_mapped = scsi_dma_map(cmd);
394 else if (sg_mapped < 0)
397 set_srp_direction(cmd, srp_cmd, sg_mapped);
399 /* special case; we can use a single direct descriptor */
400 if (sg_mapped == 1) {
401 map_sg_list(cmd, sg_mapped, data);
405 indirect->table_desc.va = 0;
406 indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf);
407 indirect->table_desc.key = 0;
409 if (sg_mapped <= MAX_INDIRECT_BUFS) {
410 total_length = map_sg_list(cmd, sg_mapped,
411 &indirect->desc_list[0]);
412 indirect->len = total_length;
416 /* get indirect table */
417 if (!evt_struct->ext_list) {
418 evt_struct->ext_list = (struct srp_direct_buf *)
419 dma_alloc_coherent(dev,
420 SG_ALL * sizeof(struct srp_direct_buf),
421 &evt_struct->ext_list_token, 0);
422 if (!evt_struct->ext_list) {
423 sdev_printk(KERN_ERR, cmd->device,
424 "Can't allocate memory for indirect table\n");
429 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
431 indirect->len = total_length;
432 indirect->table_desc.va = evt_struct->ext_list_token;
433 indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
434 memcpy(indirect->desc_list, evt_struct->ext_list,
435 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
440 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
441 * @cmd: struct scsi_cmnd with the memory to be mapped
442 * @srp_cmd: srp_cmd that contains the memory descriptor
443 * @dev: dma device for which to map dma memory
445 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
446 * Returns 1 on success.
448 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
449 struct srp_event_struct *evt_struct,
450 struct srp_cmd *srp_cmd, struct device *dev)
452 switch (cmd->sc_data_direction) {
453 case DMA_FROM_DEVICE:
458 case DMA_BIDIRECTIONAL:
459 sdev_printk(KERN_ERR, cmd->device,
460 "Can't map DMA_BIDIRECTIONAL to read/write\n");
463 sdev_printk(KERN_ERR, cmd->device,
464 "Unknown data direction 0x%02x; can't map!\n",
465 cmd->sc_data_direction);
469 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
473 * purge_requests: Our virtual adapter just shut down. purge any sent requests
474 * @hostdata: the adapter
476 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
478 struct srp_event_struct *tmp_evt, *pos;
481 spin_lock_irqsave(hostdata->host->host_lock, flags);
482 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
483 list_del(&tmp_evt->list);
484 del_timer(&tmp_evt->timer);
486 tmp_evt->cmnd->result = (error_code << 16);
487 unmap_cmd_data(&tmp_evt->iu.srp.cmd,
489 tmp_evt->hostdata->dev);
490 if (tmp_evt->cmnd_done)
491 tmp_evt->cmnd_done(tmp_evt->cmnd);
492 } else if (tmp_evt->done)
493 tmp_evt->done(tmp_evt);
494 free_event_struct(&tmp_evt->hostdata->pool, tmp_evt);
496 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
500 * ibmvscsi_reset_host - Reset the connection to the server
501 * @hostdata: struct ibmvscsi_host_data to reset
503 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
505 scsi_block_requests(hostdata->host);
506 atomic_set(&hostdata->request_limit, 0);
508 purge_requests(hostdata, DID_ERROR);
509 if ((ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata)) ||
510 (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0)) ||
511 (vio_enable_interrupts(to_vio_dev(hostdata->dev)))) {
512 atomic_set(&hostdata->request_limit, -1);
513 dev_err(hostdata->dev, "error after reset\n");
516 scsi_unblock_requests(hostdata->host);
520 * ibmvscsi_timeout - Internal command timeout handler
521 * @evt_struct: struct srp_event_struct that timed out
523 * Called when an internally generated command times out
525 static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
527 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
529 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
530 evt_struct->iu.srp.cmd.opcode);
532 ibmvscsi_reset_host(hostdata);
536 /* ------------------------------------------------------------
537 * Routines for sending and receiving SRPs
540 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
541 * @evt_struct: evt_struct to be sent
542 * @hostdata: ibmvscsi_host_data of host
543 * @timeout: timeout in seconds - 0 means do not time command
545 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
546 * Note that this routine assumes that host_lock is held for synchronization
548 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
549 struct ibmvscsi_host_data *hostdata,
550 unsigned long timeout)
552 u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
556 /* If we have exhausted our request limit, just fail this request,
557 * unless it is for a reset or abort.
558 * Note that there are rare cases involving driver generated requests
559 * (such as task management requests) that the mid layer may think we
560 * can handle more requests (can_queue) when we actually can't
562 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
564 atomic_dec_if_positive(&hostdata->request_limit);
565 /* If request limit was -1 when we started, it is now even
568 if (request_status < -1)
570 /* Otherwise, we may have run out of requests. */
571 /* Abort and reset calls should make it through.
572 * Nothing except abort and reset should use the last two
573 * slots unless we had two or less to begin with.
575 else if (request_status < 2 &&
576 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
577 /* In the case that we have less than two requests
578 * available, check the server limit as a combination
579 * of the request limit and the number of requests
580 * in-flight (the size of the send list). If the
581 * server limit is greater than 2, return busy so
582 * that the last two are reserved for reset and abort.
584 int server_limit = request_status;
585 struct srp_event_struct *tmp_evt;
587 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
591 if (server_limit > 2)
596 /* Copy the IU into the transfer area */
597 *evt_struct->xfer_iu = evt_struct->iu;
598 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
600 /* Add this to the sent list. We need to do this
601 * before we actually send
602 * in case it comes back REALLY fast
604 list_add_tail(&evt_struct->list, &hostdata->sent);
606 init_timer(&evt_struct->timer);
608 evt_struct->timer.data = (unsigned long) evt_struct;
609 evt_struct->timer.expires = jiffies + (timeout * HZ);
610 evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
611 add_timer(&evt_struct->timer);
615 ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
616 list_del(&evt_struct->list);
617 del_timer(&evt_struct->timer);
619 dev_err(hostdata->dev, "send error %d\n", rc);
620 atomic_inc(&hostdata->request_limit);
627 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
629 free_event_struct(&hostdata->pool, evt_struct);
630 atomic_inc(&hostdata->request_limit);
631 return SCSI_MLQUEUE_HOST_BUSY;
634 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
636 if (evt_struct->cmnd != NULL) {
637 evt_struct->cmnd->result = DID_ERROR << 16;
638 evt_struct->cmnd_done(evt_struct->cmnd);
639 } else if (evt_struct->done)
640 evt_struct->done(evt_struct);
642 free_event_struct(&hostdata->pool, evt_struct);
647 * handle_cmd_rsp: - Handle responses from commands
648 * @evt_struct: srp_event_struct to be handled
650 * Used as a callback by when sending scsi cmds.
651 * Gets called by ibmvscsi_handle_crq()
653 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
655 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
656 struct scsi_cmnd *cmnd = evt_struct->cmnd;
658 if (unlikely(rsp->opcode != SRP_RSP)) {
659 if (printk_ratelimit())
660 dev_warn(evt_struct->hostdata->dev,
661 "bad SRP RSP type %d\n", rsp->opcode);
665 cmnd->result = rsp->status;
666 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
667 memcpy(cmnd->sense_buffer,
669 rsp->sense_data_len);
670 unmap_cmd_data(&evt_struct->iu.srp.cmd,
672 evt_struct->hostdata->dev);
674 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
675 scsi_set_resid(cmnd, rsp->data_out_res_cnt);
676 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
677 scsi_set_resid(cmnd, rsp->data_in_res_cnt);
680 if (evt_struct->cmnd_done)
681 evt_struct->cmnd_done(cmnd);
685 * lun_from_dev: - Returns the lun of the scsi device
686 * @dev: struct scsi_device
689 static inline u16 lun_from_dev(struct scsi_device *dev)
691 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
695 * ibmvscsi_queue: - The queuecommand function of the scsi template
696 * @cmd: struct scsi_cmnd to be executed
697 * @done: Callback function to be called when cmd is completed
699 static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
700 void (*done) (struct scsi_cmnd *))
702 struct srp_cmd *srp_cmd;
703 struct srp_event_struct *evt_struct;
704 struct srp_indirect_buf *indirect;
705 struct ibmvscsi_host_data *hostdata =
706 (struct ibmvscsi_host_data *)&cmnd->device->host->hostdata;
707 u16 lun = lun_from_dev(cmnd->device);
710 evt_struct = get_event_struct(&hostdata->pool);
712 return SCSI_MLQUEUE_HOST_BUSY;
714 /* Set up the actual SRP IU */
715 srp_cmd = &evt_struct->iu.srp.cmd;
716 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
717 srp_cmd->opcode = SRP_CMD;
718 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd));
719 srp_cmd->lun = ((u64) lun) << 48;
721 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
722 sdev_printk(KERN_ERR, cmnd->device, "couldn't convert cmd to srp_cmd\n");
723 free_event_struct(&hostdata->pool, evt_struct);
724 return SCSI_MLQUEUE_HOST_BUSY;
727 init_event_struct(evt_struct,
730 cmnd->timeout_per_command/HZ);
732 evt_struct->cmnd = cmnd;
733 evt_struct->cmnd_done = done;
735 /* Fix up dma address of the buffer itself */
736 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
737 out_fmt = srp_cmd->buf_fmt >> 4;
738 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
739 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
740 out_fmt == SRP_DATA_DESC_INDIRECT) &&
741 indirect->table_desc.va == 0) {
742 indirect->table_desc.va = evt_struct->crq.IU_data_ptr +
743 offsetof(struct srp_cmd, add_data) +
744 offsetof(struct srp_indirect_buf, desc_list);
747 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
750 /* ------------------------------------------------------------
751 * Routines for driver initialization
754 * adapter_info_rsp: - Handle response to MAD adapter info request
755 * @evt_struct: srp_event_struct with the response
757 * Used as a "done" callback by when sending adapter_info. Gets called
758 * by ibmvscsi_handle_crq()
760 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
762 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
763 dma_unmap_single(hostdata->dev,
764 evt_struct->iu.mad.adapter_info.buffer,
765 evt_struct->iu.mad.adapter_info.common.length,
768 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
769 dev_err(hostdata->dev, "error %d getting adapter info\n",
770 evt_struct->xfer_iu->mad.adapter_info.common.status);
772 dev_info(hostdata->dev, "host srp version: %s, "
773 "host partition %s (%d), OS %d, max io %u\n",
774 hostdata->madapter_info.srp_version,
775 hostdata->madapter_info.partition_name,
776 hostdata->madapter_info.partition_number,
777 hostdata->madapter_info.os_type,
778 hostdata->madapter_info.port_max_txu[0]);
780 if (hostdata->madapter_info.port_max_txu[0])
781 hostdata->host->max_sectors =
782 hostdata->madapter_info.port_max_txu[0] >> 9;
784 if (hostdata->madapter_info.os_type == 3 &&
785 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
786 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
787 hostdata->madapter_info.srp_version);
788 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
790 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
796 * send_mad_adapter_info: - Sends the mad adapter info request
797 * and stores the result so it can be retrieved with
798 * sysfs. We COULD consider causing a failure if the
799 * returned SRP version doesn't match ours.
800 * @hostdata: ibmvscsi_host_data of host
802 * Returns zero if successful.
804 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
806 struct viosrp_adapter_info *req;
807 struct srp_event_struct *evt_struct;
811 evt_struct = get_event_struct(&hostdata->pool);
813 dev_err(hostdata->dev,
814 "couldn't allocate an event for ADAPTER_INFO_REQ!\n");
818 init_event_struct(evt_struct,
823 req = &evt_struct->iu.mad.adapter_info;
824 memset(req, 0x00, sizeof(*req));
826 req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
827 req->common.length = sizeof(hostdata->madapter_info);
828 req->buffer = addr = dma_map_single(hostdata->dev,
829 &hostdata->madapter_info,
830 sizeof(hostdata->madapter_info),
833 if (dma_mapping_error(req->buffer)) {
834 dev_err(hostdata->dev, "Unable to map request_buffer for adapter_info!\n");
835 free_event_struct(&hostdata->pool, evt_struct);
839 spin_lock_irqsave(hostdata->host->host_lock, flags);
840 if (ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2)) {
841 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
842 dma_unmap_single(hostdata->dev,
844 sizeof(hostdata->madapter_info),
847 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
851 * login_rsp: - Handle response to SRP login request
852 * @evt_struct: srp_event_struct with the response
854 * Used as a "done" callback by when sending srp_login. Gets called
855 * by ibmvscsi_handle_crq()
857 static void login_rsp(struct srp_event_struct *evt_struct)
859 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
860 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
861 case SRP_LOGIN_RSP: /* it worked! */
863 case SRP_LOGIN_REJ: /* refused! */
864 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
865 evt_struct->xfer_iu->srp.login_rej.reason);
867 atomic_set(&hostdata->request_limit, -1);
870 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
871 evt_struct->xfer_iu->srp.login_rsp.opcode);
873 atomic_set(&hostdata->request_limit, -1);
877 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
879 if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta < 0)
880 dev_err(hostdata->dev, "Invalid request_limit.\n");
882 /* Now we know what the real request-limit is.
883 * This value is set rather than added to request_limit because
884 * request_limit could have been set to -1 by this client.
886 atomic_set(&hostdata->request_limit,
887 evt_struct->xfer_iu->srp.login_rsp.req_lim_delta);
889 /* If we had any pending I/Os, kick them */
890 scsi_unblock_requests(hostdata->host);
892 send_mad_adapter_info(hostdata);
897 * send_srp_login: - Sends the srp login
898 * @hostdata: ibmvscsi_host_data of host
900 * Returns zero if successful.
902 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
906 struct srp_login_req *login;
907 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
909 dev_err(hostdata->dev, "couldn't allocate an event for login req!\n");
913 init_event_struct(evt_struct,
918 login = &evt_struct->iu.srp.login_req;
919 memset(login, 0x00, sizeof(struct srp_login_req));
920 login->opcode = SRP_LOGIN_REQ;
921 login->req_it_iu_len = sizeof(union srp_iu);
922 login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
924 spin_lock_irqsave(hostdata->host->host_lock, flags);
925 /* Start out with a request limit of 1, since this is negotiated in
926 * the login request we are just sending
928 atomic_set(&hostdata->request_limit, 1);
930 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2);
931 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
932 dev_info(hostdata->dev, "sent SRP login\n");
937 * sync_completion: Signal that a synchronous command has completed
938 * Note that after returning from this call, the evt_struct is freed.
939 * the caller waiting on this completion shouldn't touch the evt_struct
942 static void sync_completion(struct srp_event_struct *evt_struct)
944 /* copy the response back */
945 if (evt_struct->sync_srp)
946 *evt_struct->sync_srp = *evt_struct->xfer_iu;
948 complete(&evt_struct->comp);
952 * ibmvscsi_abort: Abort a command...from scsi host template
953 * send this over to the server and wait synchronously for the response
955 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
957 struct ibmvscsi_host_data *hostdata =
958 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
959 struct srp_tsk_mgmt *tsk_mgmt;
960 struct srp_event_struct *evt;
961 struct srp_event_struct *tmp_evt, *found_evt;
962 union viosrp_iu srp_rsp;
965 u16 lun = lun_from_dev(cmd->device);
967 /* First, find this command in our sent list so we can figure
968 * out the correct tag
970 spin_lock_irqsave(hostdata->host->host_lock, flags);
972 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
973 if (tmp_evt->cmnd == cmd) {
980 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
984 evt = get_event_struct(&hostdata->pool);
986 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
987 sdev_printk(KERN_ERR, cmd->device, "failed to allocate abort event\n");
991 init_event_struct(evt,
996 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
998 /* Set up an abort SRP command */
999 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1000 tsk_mgmt->opcode = SRP_TSK_MGMT;
1001 tsk_mgmt->lun = ((u64) lun) << 48;
1002 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1003 tsk_mgmt->task_tag = (u64) found_evt;
1005 sdev_printk(KERN_INFO, cmd->device, "aborting command. lun 0x%lx, tag 0x%lx\n",
1006 tsk_mgmt->lun, tsk_mgmt->task_tag);
1008 evt->sync_srp = &srp_rsp;
1009 init_completion(&evt->comp);
1010 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2);
1011 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1013 sdev_printk(KERN_ERR, cmd->device,
1014 "failed to send abort() event. rc=%d\n", rsp_rc);
1018 wait_for_completion(&evt->comp);
1020 /* make sure we got a good response */
1021 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1022 if (printk_ratelimit())
1023 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1024 srp_rsp.srp.rsp.opcode);
1028 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1029 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1031 rsp_rc = srp_rsp.srp.rsp.status;
1034 if (printk_ratelimit())
1035 sdev_printk(KERN_WARNING, cmd->device,
1036 "abort code %d for task tag 0x%lx\n",
1037 rsp_rc, tsk_mgmt->task_tag);
1041 /* Because we dropped the spinlock above, it's possible
1042 * The event is no longer in our list. Make sure it didn't
1043 * complete while we were aborting
1045 spin_lock_irqsave(hostdata->host->host_lock, flags);
1047 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1048 if (tmp_evt->cmnd == cmd) {
1049 found_evt = tmp_evt;
1054 if (found_evt == NULL) {
1055 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1056 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%lx completed\n",
1057 tsk_mgmt->task_tag);
1061 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%lx\n",
1062 tsk_mgmt->task_tag);
1064 cmd->result = (DID_ABORT << 16);
1065 list_del(&found_evt->list);
1066 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1067 found_evt->hostdata->dev);
1068 free_event_struct(&found_evt->hostdata->pool, found_evt);
1069 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1070 atomic_inc(&hostdata->request_limit);
1075 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1076 * template send this over to the server and wait synchronously for the
1079 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1081 struct ibmvscsi_host_data *hostdata =
1082 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
1084 struct srp_tsk_mgmt *tsk_mgmt;
1085 struct srp_event_struct *evt;
1086 struct srp_event_struct *tmp_evt, *pos;
1087 union viosrp_iu srp_rsp;
1089 unsigned long flags;
1090 u16 lun = lun_from_dev(cmd->device);
1092 spin_lock_irqsave(hostdata->host->host_lock, flags);
1093 evt = get_event_struct(&hostdata->pool);
1095 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1096 sdev_printk(KERN_ERR, cmd->device, "failed to allocate reset event\n");
1100 init_event_struct(evt,
1105 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1107 /* Set up a lun reset SRP command */
1108 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1109 tsk_mgmt->opcode = SRP_TSK_MGMT;
1110 tsk_mgmt->lun = ((u64) lun) << 48;
1111 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1113 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%lx\n",
1116 evt->sync_srp = &srp_rsp;
1117 init_completion(&evt->comp);
1118 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2);
1119 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1121 sdev_printk(KERN_ERR, cmd->device,
1122 "failed to send reset event. rc=%d\n", rsp_rc);
1126 wait_for_completion(&evt->comp);
1128 /* make sure we got a good response */
1129 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1130 if (printk_ratelimit())
1131 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1132 srp_rsp.srp.rsp.opcode);
1136 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1137 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1139 rsp_rc = srp_rsp.srp.rsp.status;
1142 if (printk_ratelimit())
1143 sdev_printk(KERN_WARNING, cmd->device,
1144 "reset code %d for task tag 0x%lx\n",
1145 rsp_rc, tsk_mgmt->task_tag);
1149 /* We need to find all commands for this LUN that have not yet been
1150 * responded to, and fail them with DID_RESET
1152 spin_lock_irqsave(hostdata->host->host_lock, flags);
1153 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1154 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1156 tmp_evt->cmnd->result = (DID_RESET << 16);
1157 list_del(&tmp_evt->list);
1158 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1159 tmp_evt->hostdata->dev);
1160 free_event_struct(&tmp_evt->hostdata->pool,
1162 atomic_inc(&hostdata->request_limit);
1163 if (tmp_evt->cmnd_done)
1164 tmp_evt->cmnd_done(tmp_evt->cmnd);
1165 else if (tmp_evt->done)
1166 tmp_evt->done(tmp_evt);
1169 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1174 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1175 * @cmd: struct scsi_cmnd having problems
1177 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1179 unsigned long wait_switch = 0;
1180 struct ibmvscsi_host_data *hostdata =
1181 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
1183 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1185 ibmvscsi_reset_host(hostdata);
1187 for (wait_switch = jiffies + (init_timeout * HZ);
1188 time_before(jiffies, wait_switch) &&
1189 atomic_read(&hostdata->request_limit) < 2;) {
1194 if (atomic_read(&hostdata->request_limit) <= 0)
1201 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1202 * @crq: Command/Response queue
1203 * @hostdata: ibmvscsi_host_data of host
1206 void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1207 struct ibmvscsi_host_data *hostdata)
1210 unsigned long flags;
1211 struct srp_event_struct *evt_struct =
1212 (struct srp_event_struct *)crq->IU_data_ptr;
1213 switch (crq->valid) {
1214 case 0xC0: /* initialization */
1215 switch (crq->format) {
1216 case 0x01: /* Initialization message */
1217 dev_info(hostdata->dev, "partner initialized\n");
1218 /* Send back a response */
1219 if ((rc = ibmvscsi_send_crq(hostdata,
1220 0xC002000000000000LL, 0)) == 0) {
1222 send_srp_login(hostdata);
1224 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1228 case 0x02: /* Initialization response */
1229 dev_info(hostdata->dev, "partner initialization complete\n");
1232 send_srp_login(hostdata);
1235 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1238 case 0xFF: /* Hypervisor telling us the connection is closed */
1239 scsi_block_requests(hostdata->host);
1240 atomic_set(&hostdata->request_limit, 0);
1241 if (crq->format == 0x06) {
1242 /* We need to re-setup the interpartition connection */
1243 dev_info(hostdata->dev, "Re-enabling adapter!\n");
1244 purge_requests(hostdata, DID_REQUEUE);
1245 if ((ibmvscsi_reenable_crq_queue(&hostdata->queue,
1247 (ibmvscsi_send_crq(hostdata,
1248 0xC001000000000000LL, 0))) {
1249 atomic_set(&hostdata->request_limit,
1251 dev_err(hostdata->dev, "error after enable\n");
1254 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1257 purge_requests(hostdata, DID_ERROR);
1258 if ((ibmvscsi_reset_crq_queue(&hostdata->queue,
1260 (ibmvscsi_send_crq(hostdata,
1261 0xC001000000000000LL, 0))) {
1262 atomic_set(&hostdata->request_limit,
1264 dev_err(hostdata->dev, "error after reset\n");
1267 scsi_unblock_requests(hostdata->host);
1269 case 0x80: /* real payload */
1272 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1277 /* The only kind of payload CRQs we should get are responses to
1278 * things we send. Make sure this response is to something we
1281 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1282 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1283 (void *)crq->IU_data_ptr);
1287 if (atomic_read(&evt_struct->free)) {
1288 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1289 (void *)crq->IU_data_ptr);
1293 if (crq->format == VIOSRP_SRP_FORMAT)
1294 atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta,
1295 &hostdata->request_limit);
1297 del_timer(&evt_struct->timer);
1299 if (evt_struct->done)
1300 evt_struct->done(evt_struct);
1302 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1305 * Lock the host_lock before messing with these structures, since we
1306 * are running in a task context
1308 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1309 list_del(&evt_struct->list);
1310 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1311 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1315 * ibmvscsi_get_host_config: Send the command to the server to get host
1316 * configuration data. The data is opaque to us.
1318 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1319 unsigned char *buffer, int length)
1321 struct viosrp_host_config *host_config;
1322 struct srp_event_struct *evt_struct;
1323 unsigned long flags;
1327 evt_struct = get_event_struct(&hostdata->pool);
1329 dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n");
1333 init_event_struct(evt_struct,
1338 host_config = &evt_struct->iu.mad.host_config;
1340 /* Set up a lun reset SRP command */
1341 memset(host_config, 0x00, sizeof(*host_config));
1342 host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1343 host_config->common.length = length;
1344 host_config->buffer = addr = dma_map_single(hostdata->dev, buffer,
1348 if (dma_mapping_error(host_config->buffer)) {
1349 dev_err(hostdata->dev, "dma_mapping error getting host config\n");
1350 free_event_struct(&hostdata->pool, evt_struct);
1354 init_completion(&evt_struct->comp);
1355 spin_lock_irqsave(hostdata->host->host_lock, flags);
1356 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2);
1357 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1359 wait_for_completion(&evt_struct->comp);
1360 dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);
1366 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1367 * @sdev: struct scsi_device device to configure
1369 * Enable allow_restart for a device if it is a disk. Adjust the
1370 * queue_depth here also as is required by the documentation for
1371 * struct scsi_host_template.
1373 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1375 struct Scsi_Host *shost = sdev->host;
1376 unsigned long lock_flags = 0;
1378 spin_lock_irqsave(shost->host_lock, lock_flags);
1379 if (sdev->type == TYPE_DISK)
1380 sdev->allow_restart = 1;
1381 scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun);
1382 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1387 * ibmvscsi_change_queue_depth - Change the device's queue depth
1388 * @sdev: scsi device struct
1389 * @qdepth: depth to set
1394 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1396 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1397 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1399 scsi_adjust_queue_depth(sdev, 0, qdepth);
1400 return sdev->queue_depth;
1403 /* ------------------------------------------------------------
1406 static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf)
1408 struct Scsi_Host *shost = class_to_shost(class_dev);
1409 struct ibmvscsi_host_data *hostdata =
1410 (struct ibmvscsi_host_data *)shost->hostdata;
1413 len = snprintf(buf, PAGE_SIZE, "%s\n",
1414 hostdata->madapter_info.srp_version);
1418 static struct class_device_attribute ibmvscsi_host_srp_version = {
1420 .name = "srp_version",
1423 .show = show_host_srp_version,
1426 static ssize_t show_host_partition_name(struct class_device *class_dev,
1429 struct Scsi_Host *shost = class_to_shost(class_dev);
1430 struct ibmvscsi_host_data *hostdata =
1431 (struct ibmvscsi_host_data *)shost->hostdata;
1434 len = snprintf(buf, PAGE_SIZE, "%s\n",
1435 hostdata->madapter_info.partition_name);
1439 static struct class_device_attribute ibmvscsi_host_partition_name = {
1441 .name = "partition_name",
1444 .show = show_host_partition_name,
1447 static ssize_t show_host_partition_number(struct class_device *class_dev,
1450 struct Scsi_Host *shost = class_to_shost(class_dev);
1451 struct ibmvscsi_host_data *hostdata =
1452 (struct ibmvscsi_host_data *)shost->hostdata;
1455 len = snprintf(buf, PAGE_SIZE, "%d\n",
1456 hostdata->madapter_info.partition_number);
1460 static struct class_device_attribute ibmvscsi_host_partition_number = {
1462 .name = "partition_number",
1465 .show = show_host_partition_number,
1468 static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf)
1470 struct Scsi_Host *shost = class_to_shost(class_dev);
1471 struct ibmvscsi_host_data *hostdata =
1472 (struct ibmvscsi_host_data *)shost->hostdata;
1475 len = snprintf(buf, PAGE_SIZE, "%d\n",
1476 hostdata->madapter_info.mad_version);
1480 static struct class_device_attribute ibmvscsi_host_mad_version = {
1482 .name = "mad_version",
1485 .show = show_host_mad_version,
1488 static ssize_t show_host_os_type(struct class_device *class_dev, char *buf)
1490 struct Scsi_Host *shost = class_to_shost(class_dev);
1491 struct ibmvscsi_host_data *hostdata =
1492 (struct ibmvscsi_host_data *)shost->hostdata;
1495 len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
1499 static struct class_device_attribute ibmvscsi_host_os_type = {
1504 .show = show_host_os_type,
1507 static ssize_t show_host_config(struct class_device *class_dev, char *buf)
1509 struct Scsi_Host *shost = class_to_shost(class_dev);
1510 struct ibmvscsi_host_data *hostdata =
1511 (struct ibmvscsi_host_data *)shost->hostdata;
1513 /* returns null-terminated host config data */
1514 if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
1520 static struct class_device_attribute ibmvscsi_host_config = {
1525 .show = show_host_config,
1528 static struct class_device_attribute *ibmvscsi_attrs[] = {
1529 &ibmvscsi_host_srp_version,
1530 &ibmvscsi_host_partition_name,
1531 &ibmvscsi_host_partition_number,
1532 &ibmvscsi_host_mad_version,
1533 &ibmvscsi_host_os_type,
1534 &ibmvscsi_host_config,
1538 /* ------------------------------------------------------------
1539 * SCSI driver registration
1541 static struct scsi_host_template driver_template = {
1542 .module = THIS_MODULE,
1543 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
1544 .proc_name = "ibmvscsi",
1545 .queuecommand = ibmvscsi_queuecommand,
1546 .eh_abort_handler = ibmvscsi_eh_abort_handler,
1547 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
1548 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
1549 .slave_configure = ibmvscsi_slave_configure,
1550 .change_queue_depth = ibmvscsi_change_queue_depth,
1552 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
1554 .sg_tablesize = SG_ALL,
1555 .use_clustering = ENABLE_CLUSTERING,
1556 .shost_attrs = ibmvscsi_attrs,
1560 * Called by bus code for each adapter
1562 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1564 struct ibmvscsi_host_data *hostdata;
1565 struct Scsi_Host *host;
1566 struct device *dev = &vdev->dev;
1567 unsigned long wait_switch = 0;
1570 vdev->dev.driver_data = NULL;
1572 driver_template.can_queue = max_requests;
1573 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
1575 dev_err(&vdev->dev, "couldn't allocate host data\n");
1576 goto scsi_host_alloc_failed;
1579 hostdata = (struct ibmvscsi_host_data *)host->hostdata;
1580 memset(hostdata, 0x00, sizeof(*hostdata));
1581 INIT_LIST_HEAD(&hostdata->sent);
1582 hostdata->host = host;
1583 hostdata->dev = dev;
1584 atomic_set(&hostdata->request_limit, -1);
1585 hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
1587 rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_requests);
1588 if (rc != 0 && rc != H_RESOURCE) {
1589 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
1590 goto init_crq_failed;
1592 if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) {
1593 dev_err(&vdev->dev, "couldn't initialize event pool\n");
1594 goto init_pool_failed;
1598 host->max_id = max_id;
1599 host->max_channel = max_channel;
1601 if (scsi_add_host(hostdata->host, hostdata->dev))
1602 goto add_host_failed;
1604 /* Try to send an initialization message. Note that this is allowed
1605 * to fail if the other end is not acive. In that case we don't
1608 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
1609 || rc == H_RESOURCE) {
1611 * Wait around max init_timeout secs for the adapter to finish
1612 * initializing. When we are done initializing, we will have a
1613 * valid request_limit. We don't want Linux scanning before
1616 for (wait_switch = jiffies + (init_timeout * HZ);
1617 time_before(jiffies, wait_switch) &&
1618 atomic_read(&hostdata->request_limit) < 2;) {
1623 /* if we now have a valid request_limit, initiate a scan */
1624 if (atomic_read(&hostdata->request_limit) > 0)
1625 scsi_scan_host(host);
1628 vdev->dev.driver_data = hostdata;
1632 release_event_pool(&hostdata->pool, hostdata);
1634 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests);
1636 scsi_host_put(host);
1637 scsi_host_alloc_failed:
1641 static int ibmvscsi_remove(struct vio_dev *vdev)
1643 struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data;
1644 release_event_pool(&hostdata->pool, hostdata);
1645 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
1648 scsi_remove_host(hostdata->host);
1649 scsi_host_put(hostdata->host);
1655 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1658 static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
1659 {"vscsi", "IBM,v-scsi"},
1662 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
1664 static struct vio_driver ibmvscsi_driver = {
1665 .id_table = ibmvscsi_device_table,
1666 .probe = ibmvscsi_probe,
1667 .remove = ibmvscsi_remove,
1670 .owner = THIS_MODULE,
1674 int __init ibmvscsi_module_init(void)
1676 return vio_register_driver(&ibmvscsi_driver);
1679 void __exit ibmvscsi_module_exit(void)
1681 vio_unregister_driver(&ibmvscsi_driver);
1684 module_init(ibmvscsi_module_init);
1685 module_exit(ibmvscsi_module_exit);