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 * 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>
73 #include <linux/slab.h>
76 #include <asm/firmware.h>
78 #include <scsi/scsi.h>
79 #include <scsi/scsi_cmnd.h>
80 #include <scsi/scsi_host.h>
81 #include <scsi/scsi_device.h>
82 #include <scsi/scsi_transport_srp.h>
85 /* The values below are somewhat arbitrary default values, but
86 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
87 * Note that there are 3 bits of channel value, 6 bits of id, and
90 static int max_id
= 64;
91 static int max_channel
= 3;
92 static int init_timeout
= 300;
93 static int login_timeout
= 60;
94 static int info_timeout
= 30;
95 static int abort_timeout
= 60;
96 static int reset_timeout
= 60;
97 static int max_requests
= IBMVSCSI_MAX_REQUESTS_DEFAULT
;
98 static int max_events
= IBMVSCSI_MAX_REQUESTS_DEFAULT
+ 2;
99 static int fast_fail
= 1;
100 static int client_reserve
= 1;
102 static struct scsi_transport_template
*ibmvscsi_transport_template
;
104 #define IBMVSCSI_VERSION "1.5.8"
106 static struct ibmvscsi_ops
*ibmvscsi_ops
;
108 MODULE_DESCRIPTION("IBM Virtual SCSI");
109 MODULE_AUTHOR("Dave Boutcher");
110 MODULE_LICENSE("GPL");
111 MODULE_VERSION(IBMVSCSI_VERSION
);
113 module_param_named(max_id
, max_id
, int, S_IRUGO
| S_IWUSR
);
114 MODULE_PARM_DESC(max_id
, "Largest ID value for each channel");
115 module_param_named(max_channel
, max_channel
, int, S_IRUGO
| S_IWUSR
);
116 MODULE_PARM_DESC(max_channel
, "Largest channel value");
117 module_param_named(init_timeout
, init_timeout
, int, S_IRUGO
| S_IWUSR
);
118 MODULE_PARM_DESC(init_timeout
, "Initialization timeout in seconds");
119 module_param_named(max_requests
, max_requests
, int, S_IRUGO
);
120 MODULE_PARM_DESC(max_requests
, "Maximum requests for this adapter");
121 module_param_named(fast_fail
, fast_fail
, int, S_IRUGO
| S_IWUSR
);
122 MODULE_PARM_DESC(fast_fail
, "Enable fast fail. [Default=1]");
123 module_param_named(client_reserve
, client_reserve
, int, S_IRUGO
);
124 MODULE_PARM_DESC(client_reserve
, "Attempt client managed reserve/release");
126 /* ------------------------------------------------------------
127 * Routines for the event pool and event structs
130 * initialize_event_pool: - Allocates and initializes the event pool for a host
131 * @pool: event_pool to be initialized
132 * @size: Number of events in pool
133 * @hostdata: ibmvscsi_host_data who owns the event pool
135 * Returns zero on success.
137 static int initialize_event_pool(struct event_pool
*pool
,
138 int size
, struct ibmvscsi_host_data
*hostdata
)
144 pool
->events
= kcalloc(pool
->size
, sizeof(*pool
->events
), GFP_KERNEL
);
149 dma_alloc_coherent(hostdata
->dev
,
150 pool
->size
* sizeof(*pool
->iu_storage
),
152 if (!pool
->iu_storage
) {
157 for (i
= 0; i
< pool
->size
; ++i
) {
158 struct srp_event_struct
*evt
= &pool
->events
[i
];
159 memset(&evt
->crq
, 0x00, sizeof(evt
->crq
));
160 atomic_set(&evt
->free
, 1);
161 evt
->crq
.valid
= 0x80;
162 evt
->crq
.IU_length
= sizeof(*evt
->xfer_iu
);
163 evt
->crq
.IU_data_ptr
= pool
->iu_token
+
164 sizeof(*evt
->xfer_iu
) * i
;
165 evt
->xfer_iu
= pool
->iu_storage
+ i
;
166 evt
->hostdata
= hostdata
;
167 evt
->ext_list
= NULL
;
168 evt
->ext_list_token
= 0;
175 * release_event_pool: - Frees memory of an event pool of a host
176 * @pool: event_pool to be released
177 * @hostdata: ibmvscsi_host_data who owns the even pool
179 * Returns zero on success.
181 static void release_event_pool(struct event_pool
*pool
,
182 struct ibmvscsi_host_data
*hostdata
)
185 for (i
= 0; i
< pool
->size
; ++i
) {
186 if (atomic_read(&pool
->events
[i
].free
) != 1)
188 if (pool
->events
[i
].ext_list
) {
189 dma_free_coherent(hostdata
->dev
,
190 SG_ALL
* sizeof(struct srp_direct_buf
),
191 pool
->events
[i
].ext_list
,
192 pool
->events
[i
].ext_list_token
);
196 dev_warn(hostdata
->dev
, "releasing event pool with %d "
197 "events still in use?\n", in_use
);
199 dma_free_coherent(hostdata
->dev
,
200 pool
->size
* sizeof(*pool
->iu_storage
),
201 pool
->iu_storage
, pool
->iu_token
);
205 * valid_event_struct: - Determines if event is valid.
206 * @pool: event_pool that contains the event
207 * @evt: srp_event_struct to be checked for validity
209 * Returns zero if event is invalid, one otherwise.
211 static int valid_event_struct(struct event_pool
*pool
,
212 struct srp_event_struct
*evt
)
214 int index
= evt
- pool
->events
;
215 if (index
< 0 || index
>= pool
->size
) /* outside of bounds */
217 if (evt
!= pool
->events
+ index
) /* unaligned */
223 * ibmvscsi_free-event_struct: - Changes status of event to "free"
224 * @pool: event_pool that contains the event
225 * @evt: srp_event_struct to be modified
228 static void free_event_struct(struct event_pool
*pool
,
229 struct srp_event_struct
*evt
)
231 if (!valid_event_struct(pool
, evt
)) {
232 dev_err(evt
->hostdata
->dev
, "Freeing invalid event_struct %p "
233 "(not in pool %p)\n", evt
, pool
->events
);
236 if (atomic_inc_return(&evt
->free
) != 1) {
237 dev_err(evt
->hostdata
->dev
, "Freeing event_struct %p "
238 "which is not in use!\n", evt
);
244 * get_evt_struct: - Gets the next free event in pool
245 * @pool: event_pool that contains the events to be searched
247 * Returns the next event in "free" state, and NULL if none are free.
248 * Note that no synchronization is done here, we assume the host_lock
249 * will syncrhonze things.
251 static struct srp_event_struct
*get_event_struct(struct event_pool
*pool
)
254 int poolsize
= pool
->size
;
255 int offset
= pool
->next
;
257 for (i
= 0; i
< poolsize
; i
++) {
258 offset
= (offset
+ 1) % poolsize
;
259 if (!atomic_dec_if_positive(&pool
->events
[offset
].free
)) {
261 return &pool
->events
[offset
];
265 printk(KERN_ERR
"ibmvscsi: found no event struct in pool!\n");
270 * init_event_struct: Initialize fields in an event struct that are always
273 * @done: Routine to call when the event is responded to
274 * @format: SRP or MAD format
275 * @timeout: timeout value set in the CRQ
277 static void init_event_struct(struct srp_event_struct
*evt_struct
,
278 void (*done
) (struct srp_event_struct
*),
282 evt_struct
->cmnd
= NULL
;
283 evt_struct
->cmnd_done
= NULL
;
284 evt_struct
->sync_srp
= NULL
;
285 evt_struct
->crq
.format
= format
;
286 evt_struct
->crq
.timeout
= timeout
;
287 evt_struct
->done
= done
;
290 /* ------------------------------------------------------------
291 * Routines for receiving SCSI responses from the hosting partition
295 * set_srp_direction: Set the fields in the srp related to data
296 * direction and number of buffers based on the direction in
297 * the scsi_cmnd and the number of buffers
299 static void set_srp_direction(struct scsi_cmnd
*cmd
,
300 struct srp_cmd
*srp_cmd
,
309 fmt
= SRP_DATA_DESC_DIRECT
;
311 fmt
= SRP_DATA_DESC_INDIRECT
;
312 numbuf
= min(numbuf
, MAX_INDIRECT_BUFS
);
314 if (cmd
->sc_data_direction
== DMA_TO_DEVICE
)
315 srp_cmd
->data_out_desc_cnt
= numbuf
;
317 srp_cmd
->data_in_desc_cnt
= numbuf
;
320 if (cmd
->sc_data_direction
== DMA_TO_DEVICE
)
321 srp_cmd
->buf_fmt
= fmt
<< 4;
323 srp_cmd
->buf_fmt
= fmt
;
326 static void unmap_sg_list(int num_entries
,
328 struct srp_direct_buf
*md
)
332 for (i
= 0; i
< num_entries
; ++i
)
333 dma_unmap_single(dev
, md
[i
].va
, md
[i
].len
, DMA_BIDIRECTIONAL
);
337 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
338 * @cmd: srp_cmd whose additional_data member will be unmapped
339 * @dev: device for which the memory is mapped
342 static void unmap_cmd_data(struct srp_cmd
*cmd
,
343 struct srp_event_struct
*evt_struct
,
348 out_fmt
= cmd
->buf_fmt
>> 4;
349 in_fmt
= cmd
->buf_fmt
& ((1U << 4) - 1);
351 if (out_fmt
== SRP_NO_DATA_DESC
&& in_fmt
== SRP_NO_DATA_DESC
)
353 else if (out_fmt
== SRP_DATA_DESC_DIRECT
||
354 in_fmt
== SRP_DATA_DESC_DIRECT
) {
355 struct srp_direct_buf
*data
=
356 (struct srp_direct_buf
*) cmd
->add_data
;
357 dma_unmap_single(dev
, data
->va
, data
->len
, DMA_BIDIRECTIONAL
);
359 struct srp_indirect_buf
*indirect
=
360 (struct srp_indirect_buf
*) cmd
->add_data
;
361 int num_mapped
= indirect
->table_desc
.len
/
362 sizeof(struct srp_direct_buf
);
364 if (num_mapped
<= MAX_INDIRECT_BUFS
) {
365 unmap_sg_list(num_mapped
, dev
, &indirect
->desc_list
[0]);
369 unmap_sg_list(num_mapped
, dev
, evt_struct
->ext_list
);
373 static int map_sg_list(struct scsi_cmnd
*cmd
, int nseg
,
374 struct srp_direct_buf
*md
)
377 struct scatterlist
*sg
;
378 u64 total_length
= 0;
380 scsi_for_each_sg(cmd
, sg
, nseg
, i
) {
381 struct srp_direct_buf
*descr
= md
+ i
;
382 descr
->va
= sg_dma_address(sg
);
383 descr
->len
= sg_dma_len(sg
);
385 total_length
+= sg_dma_len(sg
);
391 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
392 * @cmd: Scsi_Cmnd with the scatterlist
393 * @srp_cmd: srp_cmd that contains the memory descriptor
394 * @dev: device for which to map dma memory
396 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
397 * Returns 1 on success.
399 static int map_sg_data(struct scsi_cmnd
*cmd
,
400 struct srp_event_struct
*evt_struct
,
401 struct srp_cmd
*srp_cmd
, struct device
*dev
)
405 u64 total_length
= 0;
406 struct srp_direct_buf
*data
=
407 (struct srp_direct_buf
*) srp_cmd
->add_data
;
408 struct srp_indirect_buf
*indirect
=
409 (struct srp_indirect_buf
*) data
;
411 sg_mapped
= scsi_dma_map(cmd
);
414 else if (sg_mapped
< 0)
417 set_srp_direction(cmd
, srp_cmd
, sg_mapped
);
419 /* special case; we can use a single direct descriptor */
420 if (sg_mapped
== 1) {
421 map_sg_list(cmd
, sg_mapped
, data
);
425 indirect
->table_desc
.va
= 0;
426 indirect
->table_desc
.len
= sg_mapped
* sizeof(struct srp_direct_buf
);
427 indirect
->table_desc
.key
= 0;
429 if (sg_mapped
<= MAX_INDIRECT_BUFS
) {
430 total_length
= map_sg_list(cmd
, sg_mapped
,
431 &indirect
->desc_list
[0]);
432 indirect
->len
= total_length
;
436 /* get indirect table */
437 if (!evt_struct
->ext_list
) {
438 evt_struct
->ext_list
= (struct srp_direct_buf
*)
439 dma_alloc_coherent(dev
,
440 SG_ALL
* sizeof(struct srp_direct_buf
),
441 &evt_struct
->ext_list_token
, 0);
442 if (!evt_struct
->ext_list
) {
443 if (!firmware_has_feature(FW_FEATURE_CMO
))
444 sdev_printk(KERN_ERR
, cmd
->device
,
445 "Can't allocate memory "
446 "for indirect table\n");
452 total_length
= map_sg_list(cmd
, sg_mapped
, evt_struct
->ext_list
);
454 indirect
->len
= total_length
;
455 indirect
->table_desc
.va
= evt_struct
->ext_list_token
;
456 indirect
->table_desc
.len
= sg_mapped
* sizeof(indirect
->desc_list
[0]);
457 memcpy(indirect
->desc_list
, evt_struct
->ext_list
,
458 MAX_INDIRECT_BUFS
* sizeof(struct srp_direct_buf
));
463 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
464 * @cmd: struct scsi_cmnd with the memory to be mapped
465 * @srp_cmd: srp_cmd that contains the memory descriptor
466 * @dev: dma device for which to map dma memory
468 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
469 * Returns 1 on success.
471 static int map_data_for_srp_cmd(struct scsi_cmnd
*cmd
,
472 struct srp_event_struct
*evt_struct
,
473 struct srp_cmd
*srp_cmd
, struct device
*dev
)
475 switch (cmd
->sc_data_direction
) {
476 case DMA_FROM_DEVICE
:
481 case DMA_BIDIRECTIONAL
:
482 sdev_printk(KERN_ERR
, cmd
->device
,
483 "Can't map DMA_BIDIRECTIONAL to read/write\n");
486 sdev_printk(KERN_ERR
, cmd
->device
,
487 "Unknown data direction 0x%02x; can't map!\n",
488 cmd
->sc_data_direction
);
492 return map_sg_data(cmd
, evt_struct
, srp_cmd
, dev
);
496 * purge_requests: Our virtual adapter just shut down. purge any sent requests
497 * @hostdata: the adapter
499 static void purge_requests(struct ibmvscsi_host_data
*hostdata
, int error_code
)
501 struct srp_event_struct
*tmp_evt
, *pos
;
504 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
505 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
506 list_del(&tmp_evt
->list
);
507 del_timer(&tmp_evt
->timer
);
509 tmp_evt
->cmnd
->result
= (error_code
<< 16);
510 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
,
512 tmp_evt
->hostdata
->dev
);
513 if (tmp_evt
->cmnd_done
)
514 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
515 } else if (tmp_evt
->done
)
516 tmp_evt
->done(tmp_evt
);
517 free_event_struct(&tmp_evt
->hostdata
->pool
, tmp_evt
);
519 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
523 * ibmvscsi_reset_host - Reset the connection to the server
524 * @hostdata: struct ibmvscsi_host_data to reset
526 static void ibmvscsi_reset_host(struct ibmvscsi_host_data
*hostdata
)
528 scsi_block_requests(hostdata
->host
);
529 atomic_set(&hostdata
->request_limit
, 0);
531 purge_requests(hostdata
, DID_ERROR
);
532 if ((ibmvscsi_ops
->reset_crq_queue(&hostdata
->queue
, hostdata
)) ||
533 (ibmvscsi_ops
->send_crq(hostdata
, 0xC001000000000000LL
, 0)) ||
534 (vio_enable_interrupts(to_vio_dev(hostdata
->dev
)))) {
535 atomic_set(&hostdata
->request_limit
, -1);
536 dev_err(hostdata
->dev
, "error after reset\n");
539 scsi_unblock_requests(hostdata
->host
);
543 * ibmvscsi_timeout - Internal command timeout handler
544 * @evt_struct: struct srp_event_struct that timed out
546 * Called when an internally generated command times out
548 static void ibmvscsi_timeout(struct srp_event_struct
*evt_struct
)
550 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
552 dev_err(hostdata
->dev
, "Command timed out (%x). Resetting connection\n",
553 evt_struct
->iu
.srp
.cmd
.opcode
);
555 ibmvscsi_reset_host(hostdata
);
559 /* ------------------------------------------------------------
560 * Routines for sending and receiving SRPs
563 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
564 * @evt_struct: evt_struct to be sent
565 * @hostdata: ibmvscsi_host_data of host
566 * @timeout: timeout in seconds - 0 means do not time command
568 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
569 * Note that this routine assumes that host_lock is held for synchronization
571 static int ibmvscsi_send_srp_event(struct srp_event_struct
*evt_struct
,
572 struct ibmvscsi_host_data
*hostdata
,
573 unsigned long timeout
)
575 u64
*crq_as_u64
= (u64
*) &evt_struct
->crq
;
576 int request_status
= 0;
579 /* If we have exhausted our request limit, just fail this request,
580 * unless it is for a reset or abort.
581 * Note that there are rare cases involving driver generated requests
582 * (such as task management requests) that the mid layer may think we
583 * can handle more requests (can_queue) when we actually can't
585 if (evt_struct
->crq
.format
== VIOSRP_SRP_FORMAT
) {
587 atomic_dec_if_positive(&hostdata
->request_limit
);
588 /* If request limit was -1 when we started, it is now even
591 if (request_status
< -1)
593 /* Otherwise, we may have run out of requests. */
594 /* If request limit was 0 when we started the adapter is in the
595 * process of performing a login with the server adapter, or
596 * we may have run out of requests.
598 else if (request_status
== -1 &&
599 evt_struct
->iu
.srp
.login_req
.opcode
!= SRP_LOGIN_REQ
)
601 /* Abort and reset calls should make it through.
602 * Nothing except abort and reset should use the last two
603 * slots unless we had two or less to begin with.
605 else if (request_status
< 2 &&
606 evt_struct
->iu
.srp
.cmd
.opcode
!= SRP_TSK_MGMT
) {
607 /* In the case that we have less than two requests
608 * available, check the server limit as a combination
609 * of the request limit and the number of requests
610 * in-flight (the size of the send list). If the
611 * server limit is greater than 2, return busy so
612 * that the last two are reserved for reset and abort.
614 int server_limit
= request_status
;
615 struct srp_event_struct
*tmp_evt
;
617 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
621 if (server_limit
> 2)
626 /* Copy the IU into the transfer area */
627 *evt_struct
->xfer_iu
= evt_struct
->iu
;
628 evt_struct
->xfer_iu
->srp
.rsp
.tag
= (u64
)evt_struct
;
630 /* Add this to the sent list. We need to do this
631 * before we actually send
632 * in case it comes back REALLY fast
634 list_add_tail(&evt_struct
->list
, &hostdata
->sent
);
636 init_timer(&evt_struct
->timer
);
638 evt_struct
->timer
.data
= (unsigned long) evt_struct
;
639 evt_struct
->timer
.expires
= jiffies
+ (timeout
* HZ
);
640 evt_struct
->timer
.function
= (void (*)(unsigned long))ibmvscsi_timeout
;
641 add_timer(&evt_struct
->timer
);
645 ibmvscsi_ops
->send_crq(hostdata
, crq_as_u64
[0], crq_as_u64
[1])) != 0) {
646 list_del(&evt_struct
->list
);
647 del_timer(&evt_struct
->timer
);
649 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
650 * Firmware will send a CRQ with a transport event (0xFF) to
651 * tell this client what has happened to the transport. This
652 * will be handled in ibmvscsi_handle_crq()
654 if (rc
== H_CLOSED
) {
655 dev_warn(hostdata
->dev
, "send warning. "
656 "Receive queue closed, will retry.\n");
659 dev_err(hostdata
->dev
, "send error %d\n", rc
);
660 atomic_inc(&hostdata
->request_limit
);
667 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
669 free_event_struct(&hostdata
->pool
, evt_struct
);
670 if (request_status
!= -1)
671 atomic_inc(&hostdata
->request_limit
);
672 return SCSI_MLQUEUE_HOST_BUSY
;
675 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
677 if (evt_struct
->cmnd
!= NULL
) {
678 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
679 evt_struct
->cmnd_done(evt_struct
->cmnd
);
680 } else if (evt_struct
->done
)
681 evt_struct
->done(evt_struct
);
683 free_event_struct(&hostdata
->pool
, evt_struct
);
688 * handle_cmd_rsp: - Handle responses from commands
689 * @evt_struct: srp_event_struct to be handled
691 * Used as a callback by when sending scsi cmds.
692 * Gets called by ibmvscsi_handle_crq()
694 static void handle_cmd_rsp(struct srp_event_struct
*evt_struct
)
696 struct srp_rsp
*rsp
= &evt_struct
->xfer_iu
->srp
.rsp
;
697 struct scsi_cmnd
*cmnd
= evt_struct
->cmnd
;
699 if (unlikely(rsp
->opcode
!= SRP_RSP
)) {
700 if (printk_ratelimit())
701 dev_warn(evt_struct
->hostdata
->dev
,
702 "bad SRP RSP type %d\n", rsp
->opcode
);
706 cmnd
->result
|= rsp
->status
;
707 if (((cmnd
->result
>> 1) & 0x1f) == CHECK_CONDITION
)
708 memcpy(cmnd
->sense_buffer
,
710 rsp
->sense_data_len
);
711 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
,
713 evt_struct
->hostdata
->dev
);
715 if (rsp
->flags
& SRP_RSP_FLAG_DOOVER
)
716 scsi_set_resid(cmnd
, rsp
->data_out_res_cnt
);
717 else if (rsp
->flags
& SRP_RSP_FLAG_DIOVER
)
718 scsi_set_resid(cmnd
, rsp
->data_in_res_cnt
);
721 if (evt_struct
->cmnd_done
)
722 evt_struct
->cmnd_done(cmnd
);
726 * lun_from_dev: - Returns the lun of the scsi device
727 * @dev: struct scsi_device
730 static inline u16
lun_from_dev(struct scsi_device
*dev
)
732 return (0x2 << 14) | (dev
->id
<< 8) | (dev
->channel
<< 5) | dev
->lun
;
736 * ibmvscsi_queue: - The queuecommand function of the scsi template
737 * @cmd: struct scsi_cmnd to be executed
738 * @done: Callback function to be called when cmd is completed
740 static int ibmvscsi_queuecommand(struct scsi_cmnd
*cmnd
,
741 void (*done
) (struct scsi_cmnd
*))
743 struct srp_cmd
*srp_cmd
;
744 struct srp_event_struct
*evt_struct
;
745 struct srp_indirect_buf
*indirect
;
746 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmnd
->device
->host
);
747 u16 lun
= lun_from_dev(cmnd
->device
);
750 cmnd
->result
= (DID_OK
<< 16);
751 evt_struct
= get_event_struct(&hostdata
->pool
);
753 return SCSI_MLQUEUE_HOST_BUSY
;
755 /* Set up the actual SRP IU */
756 srp_cmd
= &evt_struct
->iu
.srp
.cmd
;
757 memset(srp_cmd
, 0x00, SRP_MAX_IU_LEN
);
758 srp_cmd
->opcode
= SRP_CMD
;
759 memcpy(srp_cmd
->cdb
, cmnd
->cmnd
, sizeof(srp_cmd
->cdb
));
760 srp_cmd
->lun
= ((u64
) lun
) << 48;
762 if (!map_data_for_srp_cmd(cmnd
, evt_struct
, srp_cmd
, hostdata
->dev
)) {
763 if (!firmware_has_feature(FW_FEATURE_CMO
))
764 sdev_printk(KERN_ERR
, cmnd
->device
,
765 "couldn't convert cmd to srp_cmd\n");
766 free_event_struct(&hostdata
->pool
, evt_struct
);
767 return SCSI_MLQUEUE_HOST_BUSY
;
770 init_event_struct(evt_struct
,
773 cmnd
->request
->timeout
/HZ
);
775 evt_struct
->cmnd
= cmnd
;
776 evt_struct
->cmnd_done
= done
;
778 /* Fix up dma address of the buffer itself */
779 indirect
= (struct srp_indirect_buf
*) srp_cmd
->add_data
;
780 out_fmt
= srp_cmd
->buf_fmt
>> 4;
781 in_fmt
= srp_cmd
->buf_fmt
& ((1U << 4) - 1);
782 if ((in_fmt
== SRP_DATA_DESC_INDIRECT
||
783 out_fmt
== SRP_DATA_DESC_INDIRECT
) &&
784 indirect
->table_desc
.va
== 0) {
785 indirect
->table_desc
.va
= evt_struct
->crq
.IU_data_ptr
+
786 offsetof(struct srp_cmd
, add_data
) +
787 offsetof(struct srp_indirect_buf
, desc_list
);
790 return ibmvscsi_send_srp_event(evt_struct
, hostdata
, 0);
793 /* ------------------------------------------------------------
794 * Routines for driver initialization
798 * map_persist_bufs: - Pre-map persistent data for adapter logins
799 * @hostdata: ibmvscsi_host_data of host
801 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
802 * Return 1 on error, 0 on success.
804 static int map_persist_bufs(struct ibmvscsi_host_data
*hostdata
)
807 hostdata
->caps_addr
= dma_map_single(hostdata
->dev
, &hostdata
->caps
,
808 sizeof(hostdata
->caps
), DMA_BIDIRECTIONAL
);
810 if (dma_mapping_error(hostdata
->dev
, hostdata
->caps_addr
)) {
811 dev_err(hostdata
->dev
, "Unable to map capabilities buffer!\n");
815 hostdata
->adapter_info_addr
= dma_map_single(hostdata
->dev
,
816 &hostdata
->madapter_info
,
817 sizeof(hostdata
->madapter_info
),
819 if (dma_mapping_error(hostdata
->dev
, hostdata
->adapter_info_addr
)) {
820 dev_err(hostdata
->dev
, "Unable to map adapter info buffer!\n");
821 dma_unmap_single(hostdata
->dev
, hostdata
->caps_addr
,
822 sizeof(hostdata
->caps
), DMA_BIDIRECTIONAL
);
830 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
831 * @hostdata: ibmvscsi_host_data of host
833 * Unmap the capabilities and adapter info DMA buffers
835 static void unmap_persist_bufs(struct ibmvscsi_host_data
*hostdata
)
837 dma_unmap_single(hostdata
->dev
, hostdata
->caps_addr
,
838 sizeof(hostdata
->caps
), DMA_BIDIRECTIONAL
);
840 dma_unmap_single(hostdata
->dev
, hostdata
->adapter_info_addr
,
841 sizeof(hostdata
->madapter_info
), DMA_BIDIRECTIONAL
);
845 * login_rsp: - Handle response to SRP login request
846 * @evt_struct: srp_event_struct with the response
848 * Used as a "done" callback by when sending srp_login. Gets called
849 * by ibmvscsi_handle_crq()
851 static void login_rsp(struct srp_event_struct
*evt_struct
)
853 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
854 switch (evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
) {
855 case SRP_LOGIN_RSP
: /* it worked! */
857 case SRP_LOGIN_REJ
: /* refused! */
858 dev_info(hostdata
->dev
, "SRP_LOGIN_REJ reason %u\n",
859 evt_struct
->xfer_iu
->srp
.login_rej
.reason
);
861 atomic_set(&hostdata
->request_limit
, -1);
864 dev_err(hostdata
->dev
, "Invalid login response typecode 0x%02x!\n",
865 evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
);
867 atomic_set(&hostdata
->request_limit
, -1);
871 dev_info(hostdata
->dev
, "SRP_LOGIN succeeded\n");
872 hostdata
->client_migrated
= 0;
874 /* Now we know what the real request-limit is.
875 * This value is set rather than added to request_limit because
876 * request_limit could have been set to -1 by this client.
878 atomic_set(&hostdata
->request_limit
,
879 evt_struct
->xfer_iu
->srp
.login_rsp
.req_lim_delta
);
881 /* If we had any pending I/Os, kick them */
882 scsi_unblock_requests(hostdata
->host
);
886 * send_srp_login: - Sends the srp login
887 * @hostdata: ibmvscsi_host_data of host
889 * Returns zero if successful.
891 static int send_srp_login(struct ibmvscsi_host_data
*hostdata
)
895 struct srp_login_req
*login
;
896 struct srp_event_struct
*evt_struct
= get_event_struct(&hostdata
->pool
);
899 init_event_struct(evt_struct
, login_rsp
,
900 VIOSRP_SRP_FORMAT
, login_timeout
);
902 login
= &evt_struct
->iu
.srp
.login_req
;
903 memset(login
, 0, sizeof(*login
));
904 login
->opcode
= SRP_LOGIN_REQ
;
905 login
->req_it_iu_len
= sizeof(union srp_iu
);
906 login
->req_buf_fmt
= SRP_BUF_FORMAT_DIRECT
| SRP_BUF_FORMAT_INDIRECT
;
908 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
909 /* Start out with a request limit of 0, since this is negotiated in
910 * the login request we are just sending and login requests always
911 * get sent by the driver regardless of request_limit.
913 atomic_set(&hostdata
->request_limit
, 0);
915 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, login_timeout
* 2);
916 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
917 dev_info(hostdata
->dev
, "sent SRP login\n");
922 * capabilities_rsp: - Handle response to MAD adapter capabilities request
923 * @evt_struct: srp_event_struct with the response
925 * Used as a "done" callback by when sending adapter_info.
927 static void capabilities_rsp(struct srp_event_struct
*evt_struct
)
929 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
931 if (evt_struct
->xfer_iu
->mad
.capabilities
.common
.status
) {
932 dev_err(hostdata
->dev
, "error 0x%X getting capabilities info\n",
933 evt_struct
->xfer_iu
->mad
.capabilities
.common
.status
);
935 if (hostdata
->caps
.migration
.common
.server_support
!= SERVER_SUPPORTS_CAP
)
936 dev_info(hostdata
->dev
, "Partition migration not supported\n");
938 if (client_reserve
) {
939 if (hostdata
->caps
.reserve
.common
.server_support
==
941 dev_info(hostdata
->dev
, "Client reserve enabled\n");
943 dev_info(hostdata
->dev
, "Client reserve not supported\n");
947 send_srp_login(hostdata
);
951 * send_mad_capabilities: - Sends the mad capabilities request
952 * and stores the result so it can be retrieved with
953 * @hostdata: ibmvscsi_host_data of host
955 static void send_mad_capabilities(struct ibmvscsi_host_data
*hostdata
)
957 struct viosrp_capabilities
*req
;
958 struct srp_event_struct
*evt_struct
;
960 struct device_node
*of_node
= hostdata
->dev
->of_node
;
961 const char *location
;
963 evt_struct
= get_event_struct(&hostdata
->pool
);
966 init_event_struct(evt_struct
, capabilities_rsp
,
967 VIOSRP_MAD_FORMAT
, info_timeout
);
969 req
= &evt_struct
->iu
.mad
.capabilities
;
970 memset(req
, 0, sizeof(*req
));
972 hostdata
->caps
.flags
= CAP_LIST_SUPPORTED
;
973 if (hostdata
->client_migrated
)
974 hostdata
->caps
.flags
|= CLIENT_MIGRATED
;
976 strncpy(hostdata
->caps
.name
, dev_name(&hostdata
->host
->shost_gendev
),
977 sizeof(hostdata
->caps
.name
));
978 hostdata
->caps
.name
[sizeof(hostdata
->caps
.name
) - 1] = '\0';
980 location
= of_get_property(of_node
, "ibm,loc-code", NULL
);
981 location
= location
? location
: dev_name(hostdata
->dev
);
982 strncpy(hostdata
->caps
.loc
, location
, sizeof(hostdata
->caps
.loc
));
983 hostdata
->caps
.loc
[sizeof(hostdata
->caps
.loc
) - 1] = '\0';
985 req
->common
.type
= VIOSRP_CAPABILITIES_TYPE
;
986 req
->buffer
= hostdata
->caps_addr
;
988 hostdata
->caps
.migration
.common
.cap_type
= MIGRATION_CAPABILITIES
;
989 hostdata
->caps
.migration
.common
.length
= sizeof(hostdata
->caps
.migration
);
990 hostdata
->caps
.migration
.common
.server_support
= SERVER_SUPPORTS_CAP
;
991 hostdata
->caps
.migration
.ecl
= 1;
993 if (client_reserve
) {
994 hostdata
->caps
.reserve
.common
.cap_type
= RESERVATION_CAPABILITIES
;
995 hostdata
->caps
.reserve
.common
.length
= sizeof(hostdata
->caps
.reserve
);
996 hostdata
->caps
.reserve
.common
.server_support
= SERVER_SUPPORTS_CAP
;
997 hostdata
->caps
.reserve
.type
= CLIENT_RESERVE_SCSI_2
;
998 req
->common
.length
= sizeof(hostdata
->caps
);
1000 req
->common
.length
= sizeof(hostdata
->caps
) - sizeof(hostdata
->caps
.reserve
);
1002 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1003 if (ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2))
1004 dev_err(hostdata
->dev
, "couldn't send CAPABILITIES_REQ!\n");
1005 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1009 * fast_fail_rsp: - Handle response to MAD enable fast fail
1010 * @evt_struct: srp_event_struct with the response
1012 * Used as a "done" callback by when sending enable fast fail. Gets called
1013 * by ibmvscsi_handle_crq()
1015 static void fast_fail_rsp(struct srp_event_struct
*evt_struct
)
1017 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
1018 u8 status
= evt_struct
->xfer_iu
->mad
.fast_fail
.common
.status
;
1020 if (status
== VIOSRP_MAD_NOT_SUPPORTED
)
1021 dev_err(hostdata
->dev
, "fast_fail not supported in server\n");
1022 else if (status
== VIOSRP_MAD_FAILED
)
1023 dev_err(hostdata
->dev
, "fast_fail request failed\n");
1024 else if (status
!= VIOSRP_MAD_SUCCESS
)
1025 dev_err(hostdata
->dev
, "error 0x%X enabling fast_fail\n", status
);
1027 send_mad_capabilities(hostdata
);
1031 * init_host - Start host initialization
1032 * @hostdata: ibmvscsi_host_data of host
1034 * Returns zero if successful.
1036 static int enable_fast_fail(struct ibmvscsi_host_data
*hostdata
)
1039 unsigned long flags
;
1040 struct viosrp_fast_fail
*fast_fail_mad
;
1041 struct srp_event_struct
*evt_struct
;
1044 send_mad_capabilities(hostdata
);
1048 evt_struct
= get_event_struct(&hostdata
->pool
);
1049 BUG_ON(!evt_struct
);
1051 init_event_struct(evt_struct
, fast_fail_rsp
, VIOSRP_MAD_FORMAT
, info_timeout
);
1053 fast_fail_mad
= &evt_struct
->iu
.mad
.fast_fail
;
1054 memset(fast_fail_mad
, 0, sizeof(*fast_fail_mad
));
1055 fast_fail_mad
->common
.type
= VIOSRP_ENABLE_FAST_FAIL
;
1056 fast_fail_mad
->common
.length
= sizeof(*fast_fail_mad
);
1058 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1059 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2);
1060 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1065 * adapter_info_rsp: - Handle response to MAD adapter info request
1066 * @evt_struct: srp_event_struct with the response
1068 * Used as a "done" callback by when sending adapter_info. Gets called
1069 * by ibmvscsi_handle_crq()
1071 static void adapter_info_rsp(struct srp_event_struct
*evt_struct
)
1073 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
1075 if (evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
) {
1076 dev_err(hostdata
->dev
, "error %d getting adapter info\n",
1077 evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
);
1079 dev_info(hostdata
->dev
, "host srp version: %s, "
1080 "host partition %s (%d), OS %d, max io %u\n",
1081 hostdata
->madapter_info
.srp_version
,
1082 hostdata
->madapter_info
.partition_name
,
1083 hostdata
->madapter_info
.partition_number
,
1084 hostdata
->madapter_info
.os_type
,
1085 hostdata
->madapter_info
.port_max_txu
[0]);
1087 if (hostdata
->madapter_info
.port_max_txu
[0])
1088 hostdata
->host
->max_sectors
=
1089 hostdata
->madapter_info
.port_max_txu
[0] >> 9;
1091 if (hostdata
->madapter_info
.os_type
== 3 &&
1092 strcmp(hostdata
->madapter_info
.srp_version
, "1.6a") <= 0) {
1093 dev_err(hostdata
->dev
, "host (Ver. %s) doesn't support large transfers\n",
1094 hostdata
->madapter_info
.srp_version
);
1095 dev_err(hostdata
->dev
, "limiting scatterlists to %d\n",
1097 hostdata
->host
->sg_tablesize
= MAX_INDIRECT_BUFS
;
1100 if (hostdata
->madapter_info
.os_type
== 3) {
1101 enable_fast_fail(hostdata
);
1106 send_srp_login(hostdata
);
1110 * send_mad_adapter_info: - Sends the mad adapter info request
1111 * and stores the result so it can be retrieved with
1112 * sysfs. We COULD consider causing a failure if the
1113 * returned SRP version doesn't match ours.
1114 * @hostdata: ibmvscsi_host_data of host
1116 * Returns zero if successful.
1118 static void send_mad_adapter_info(struct ibmvscsi_host_data
*hostdata
)
1120 struct viosrp_adapter_info
*req
;
1121 struct srp_event_struct
*evt_struct
;
1122 unsigned long flags
;
1124 evt_struct
= get_event_struct(&hostdata
->pool
);
1125 BUG_ON(!evt_struct
);
1127 init_event_struct(evt_struct
,
1132 req
= &evt_struct
->iu
.mad
.adapter_info
;
1133 memset(req
, 0x00, sizeof(*req
));
1135 req
->common
.type
= VIOSRP_ADAPTER_INFO_TYPE
;
1136 req
->common
.length
= sizeof(hostdata
->madapter_info
);
1137 req
->buffer
= hostdata
->adapter_info_addr
;
1139 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1140 if (ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2))
1141 dev_err(hostdata
->dev
, "couldn't send ADAPTER_INFO_REQ!\n");
1142 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1146 * init_adapter: Start virtual adapter initialization sequence
1149 static void init_adapter(struct ibmvscsi_host_data
*hostdata
)
1151 send_mad_adapter_info(hostdata
);
1155 * sync_completion: Signal that a synchronous command has completed
1156 * Note that after returning from this call, the evt_struct is freed.
1157 * the caller waiting on this completion shouldn't touch the evt_struct
1160 static void sync_completion(struct srp_event_struct
*evt_struct
)
1162 /* copy the response back */
1163 if (evt_struct
->sync_srp
)
1164 *evt_struct
->sync_srp
= *evt_struct
->xfer_iu
;
1166 complete(&evt_struct
->comp
);
1170 * ibmvscsi_abort: Abort a command...from scsi host template
1171 * send this over to the server and wait synchronously for the response
1173 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd
*cmd
)
1175 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1176 struct srp_tsk_mgmt
*tsk_mgmt
;
1177 struct srp_event_struct
*evt
;
1178 struct srp_event_struct
*tmp_evt
, *found_evt
;
1179 union viosrp_iu srp_rsp
;
1181 unsigned long flags
;
1182 u16 lun
= lun_from_dev(cmd
->device
);
1183 unsigned long wait_switch
= 0;
1185 /* First, find this command in our sent list so we can figure
1186 * out the correct tag
1188 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1189 wait_switch
= jiffies
+ (init_timeout
* HZ
);
1192 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1193 if (tmp_evt
->cmnd
== cmd
) {
1194 found_evt
= tmp_evt
;
1200 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1204 evt
= get_event_struct(&hostdata
->pool
);
1206 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1207 sdev_printk(KERN_ERR
, cmd
->device
,
1208 "failed to allocate abort event\n");
1212 init_event_struct(evt
,
1217 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1219 /* Set up an abort SRP command */
1220 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1221 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1222 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1223 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_ABORT_TASK
;
1224 tsk_mgmt
->task_tag
= (u64
) found_evt
;
1226 evt
->sync_srp
= &srp_rsp
;
1228 init_completion(&evt
->comp
);
1229 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, abort_timeout
* 2);
1231 if (rsp_rc
!= SCSI_MLQUEUE_HOST_BUSY
)
1234 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1236 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1237 } while (time_before(jiffies
, wait_switch
));
1239 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1242 sdev_printk(KERN_ERR
, cmd
->device
,
1243 "failed to send abort() event. rc=%d\n", rsp_rc
);
1247 sdev_printk(KERN_INFO
, cmd
->device
,
1248 "aborting command. lun 0x%llx, tag 0x%llx\n",
1249 (((u64
) lun
) << 48), (u64
) found_evt
);
1251 wait_for_completion(&evt
->comp
);
1253 /* make sure we got a good response */
1254 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1255 if (printk_ratelimit())
1256 sdev_printk(KERN_WARNING
, cmd
->device
, "abort bad SRP RSP type %d\n",
1257 srp_rsp
.srp
.rsp
.opcode
);
1261 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1262 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1264 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1267 if (printk_ratelimit())
1268 sdev_printk(KERN_WARNING
, cmd
->device
,
1269 "abort code %d for task tag 0x%llx\n",
1270 rsp_rc
, tsk_mgmt
->task_tag
);
1274 /* Because we dropped the spinlock above, it's possible
1275 * The event is no longer in our list. Make sure it didn't
1276 * complete while we were aborting
1278 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1280 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1281 if (tmp_evt
->cmnd
== cmd
) {
1282 found_evt
= tmp_evt
;
1287 if (found_evt
== NULL
) {
1288 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1289 sdev_printk(KERN_INFO
, cmd
->device
, "aborted task tag 0x%llx completed\n",
1290 tsk_mgmt
->task_tag
);
1294 sdev_printk(KERN_INFO
, cmd
->device
, "successfully aborted task tag 0x%llx\n",
1295 tsk_mgmt
->task_tag
);
1297 cmd
->result
= (DID_ABORT
<< 16);
1298 list_del(&found_evt
->list
);
1299 unmap_cmd_data(&found_evt
->iu
.srp
.cmd
, found_evt
,
1300 found_evt
->hostdata
->dev
);
1301 free_event_struct(&found_evt
->hostdata
->pool
, found_evt
);
1302 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1303 atomic_inc(&hostdata
->request_limit
);
1308 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1309 * template send this over to the server and wait synchronously for the
1312 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd
*cmd
)
1314 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1315 struct srp_tsk_mgmt
*tsk_mgmt
;
1316 struct srp_event_struct
*evt
;
1317 struct srp_event_struct
*tmp_evt
, *pos
;
1318 union viosrp_iu srp_rsp
;
1320 unsigned long flags
;
1321 u16 lun
= lun_from_dev(cmd
->device
);
1322 unsigned long wait_switch
= 0;
1324 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1325 wait_switch
= jiffies
+ (init_timeout
* HZ
);
1327 evt
= get_event_struct(&hostdata
->pool
);
1329 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1330 sdev_printk(KERN_ERR
, cmd
->device
,
1331 "failed to allocate reset event\n");
1335 init_event_struct(evt
,
1340 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1342 /* Set up a lun reset SRP command */
1343 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1344 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1345 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1346 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_LUN_RESET
;
1348 evt
->sync_srp
= &srp_rsp
;
1350 init_completion(&evt
->comp
);
1351 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, reset_timeout
* 2);
1353 if (rsp_rc
!= SCSI_MLQUEUE_HOST_BUSY
)
1356 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1358 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1359 } while (time_before(jiffies
, wait_switch
));
1361 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1364 sdev_printk(KERN_ERR
, cmd
->device
,
1365 "failed to send reset event. rc=%d\n", rsp_rc
);
1369 sdev_printk(KERN_INFO
, cmd
->device
, "resetting device. lun 0x%llx\n",
1370 (((u64
) lun
) << 48));
1372 wait_for_completion(&evt
->comp
);
1374 /* make sure we got a good response */
1375 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1376 if (printk_ratelimit())
1377 sdev_printk(KERN_WARNING
, cmd
->device
, "reset bad SRP RSP type %d\n",
1378 srp_rsp
.srp
.rsp
.opcode
);
1382 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1383 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1385 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1388 if (printk_ratelimit())
1389 sdev_printk(KERN_WARNING
, cmd
->device
,
1390 "reset code %d for task tag 0x%llx\n",
1391 rsp_rc
, tsk_mgmt
->task_tag
);
1395 /* We need to find all commands for this LUN that have not yet been
1396 * responded to, and fail them with DID_RESET
1398 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1399 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
1400 if ((tmp_evt
->cmnd
) && (tmp_evt
->cmnd
->device
== cmd
->device
)) {
1402 tmp_evt
->cmnd
->result
= (DID_RESET
<< 16);
1403 list_del(&tmp_evt
->list
);
1404 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
, tmp_evt
,
1405 tmp_evt
->hostdata
->dev
);
1406 free_event_struct(&tmp_evt
->hostdata
->pool
,
1408 atomic_inc(&hostdata
->request_limit
);
1409 if (tmp_evt
->cmnd_done
)
1410 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
1411 else if (tmp_evt
->done
)
1412 tmp_evt
->done(tmp_evt
);
1415 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1420 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1421 * @cmd: struct scsi_cmnd having problems
1423 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd
*cmd
)
1425 unsigned long wait_switch
= 0;
1426 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1428 dev_err(hostdata
->dev
, "Resetting connection due to error recovery\n");
1430 ibmvscsi_reset_host(hostdata
);
1432 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1433 time_before(jiffies
, wait_switch
) &&
1434 atomic_read(&hostdata
->request_limit
) < 2;) {
1439 if (atomic_read(&hostdata
->request_limit
) <= 0)
1446 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1447 * @crq: Command/Response queue
1448 * @hostdata: ibmvscsi_host_data of host
1451 void ibmvscsi_handle_crq(struct viosrp_crq
*crq
,
1452 struct ibmvscsi_host_data
*hostdata
)
1455 unsigned long flags
;
1456 struct srp_event_struct
*evt_struct
=
1457 (struct srp_event_struct
*)crq
->IU_data_ptr
;
1458 switch (crq
->valid
) {
1459 case 0xC0: /* initialization */
1460 switch (crq
->format
) {
1461 case 0x01: /* Initialization message */
1462 dev_info(hostdata
->dev
, "partner initialized\n");
1463 /* Send back a response */
1464 if ((rc
= ibmvscsi_ops
->send_crq(hostdata
,
1465 0xC002000000000000LL
, 0)) == 0) {
1467 init_adapter(hostdata
);
1469 dev_err(hostdata
->dev
, "Unable to send init rsp. rc=%ld\n", rc
);
1473 case 0x02: /* Initialization response */
1474 dev_info(hostdata
->dev
, "partner initialization complete\n");
1477 init_adapter(hostdata
);
1480 dev_err(hostdata
->dev
, "unknown crq message type: %d\n", crq
->format
);
1483 case 0xFF: /* Hypervisor telling us the connection is closed */
1484 scsi_block_requests(hostdata
->host
);
1485 atomic_set(&hostdata
->request_limit
, 0);
1486 if (crq
->format
== 0x06) {
1487 /* We need to re-setup the interpartition connection */
1488 dev_info(hostdata
->dev
, "Re-enabling adapter!\n");
1489 hostdata
->client_migrated
= 1;
1490 purge_requests(hostdata
, DID_REQUEUE
);
1491 if ((ibmvscsi_ops
->reenable_crq_queue(&hostdata
->queue
,
1493 (ibmvscsi_ops
->send_crq(hostdata
,
1494 0xC001000000000000LL
, 0))) {
1495 atomic_set(&hostdata
->request_limit
,
1497 dev_err(hostdata
->dev
, "error after enable\n");
1500 dev_err(hostdata
->dev
, "Virtual adapter failed rc %d!\n",
1503 purge_requests(hostdata
, DID_ERROR
);
1504 if ((ibmvscsi_ops
->reset_crq_queue(&hostdata
->queue
,
1506 (ibmvscsi_ops
->send_crq(hostdata
,
1507 0xC001000000000000LL
, 0))) {
1508 atomic_set(&hostdata
->request_limit
,
1510 dev_err(hostdata
->dev
, "error after reset\n");
1513 scsi_unblock_requests(hostdata
->host
);
1515 case 0x80: /* real payload */
1518 dev_err(hostdata
->dev
, "got an invalid message type 0x%02x\n",
1523 /* The only kind of payload CRQs we should get are responses to
1524 * things we send. Make sure this response is to something we
1527 if (!valid_event_struct(&hostdata
->pool
, evt_struct
)) {
1528 dev_err(hostdata
->dev
, "returned correlation_token 0x%p is invalid!\n",
1529 (void *)crq
->IU_data_ptr
);
1533 if (atomic_read(&evt_struct
->free
)) {
1534 dev_err(hostdata
->dev
, "received duplicate correlation_token 0x%p!\n",
1535 (void *)crq
->IU_data_ptr
);
1539 if (crq
->format
== VIOSRP_SRP_FORMAT
)
1540 atomic_add(evt_struct
->xfer_iu
->srp
.rsp
.req_lim_delta
,
1541 &hostdata
->request_limit
);
1543 del_timer(&evt_struct
->timer
);
1545 if ((crq
->status
!= VIOSRP_OK
&& crq
->status
!= VIOSRP_OK2
) && evt_struct
->cmnd
)
1546 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
1547 if (evt_struct
->done
)
1548 evt_struct
->done(evt_struct
);
1550 dev_err(hostdata
->dev
, "returned done() is NULL; not running it!\n");
1553 * Lock the host_lock before messing with these structures, since we
1554 * are running in a task context
1556 spin_lock_irqsave(evt_struct
->hostdata
->host
->host_lock
, flags
);
1557 list_del(&evt_struct
->list
);
1558 free_event_struct(&evt_struct
->hostdata
->pool
, evt_struct
);
1559 spin_unlock_irqrestore(evt_struct
->hostdata
->host
->host_lock
, flags
);
1563 * ibmvscsi_get_host_config: Send the command to the server to get host
1564 * configuration data. The data is opaque to us.
1566 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data
*hostdata
,
1567 unsigned char *buffer
, int length
)
1569 struct viosrp_host_config
*host_config
;
1570 struct srp_event_struct
*evt_struct
;
1571 unsigned long flags
;
1575 evt_struct
= get_event_struct(&hostdata
->pool
);
1577 dev_err(hostdata
->dev
, "couldn't allocate event for HOST_CONFIG!\n");
1581 init_event_struct(evt_struct
,
1586 host_config
= &evt_struct
->iu
.mad
.host_config
;
1588 /* Set up a lun reset SRP command */
1589 memset(host_config
, 0x00, sizeof(*host_config
));
1590 host_config
->common
.type
= VIOSRP_HOST_CONFIG_TYPE
;
1591 host_config
->common
.length
= length
;
1592 host_config
->buffer
= addr
= dma_map_single(hostdata
->dev
, buffer
,
1596 if (dma_mapping_error(hostdata
->dev
, host_config
->buffer
)) {
1597 if (!firmware_has_feature(FW_FEATURE_CMO
))
1598 dev_err(hostdata
->dev
,
1599 "dma_mapping error getting host config\n");
1600 free_event_struct(&hostdata
->pool
, evt_struct
);
1604 init_completion(&evt_struct
->comp
);
1605 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1606 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2);
1607 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1609 wait_for_completion(&evt_struct
->comp
);
1610 dma_unmap_single(hostdata
->dev
, addr
, length
, DMA_BIDIRECTIONAL
);
1616 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1617 * @sdev: struct scsi_device device to configure
1619 * Enable allow_restart for a device if it is a disk. Adjust the
1620 * queue_depth here also as is required by the documentation for
1621 * struct scsi_host_template.
1623 static int ibmvscsi_slave_configure(struct scsi_device
*sdev
)
1625 struct Scsi_Host
*shost
= sdev
->host
;
1626 unsigned long lock_flags
= 0;
1628 spin_lock_irqsave(shost
->host_lock
, lock_flags
);
1629 if (sdev
->type
== TYPE_DISK
) {
1630 sdev
->allow_restart
= 1;
1631 blk_queue_rq_timeout(sdev
->request_queue
, 120 * HZ
);
1633 scsi_adjust_queue_depth(sdev
, 0, shost
->cmd_per_lun
);
1634 spin_unlock_irqrestore(shost
->host_lock
, lock_flags
);
1639 * ibmvscsi_change_queue_depth - Change the device's queue depth
1640 * @sdev: scsi device struct
1641 * @qdepth: depth to set
1642 * @reason: calling context
1647 static int ibmvscsi_change_queue_depth(struct scsi_device
*sdev
, int qdepth
,
1650 if (reason
!= SCSI_QDEPTH_DEFAULT
)
1653 if (qdepth
> IBMVSCSI_MAX_CMDS_PER_LUN
)
1654 qdepth
= IBMVSCSI_MAX_CMDS_PER_LUN
;
1656 scsi_adjust_queue_depth(sdev
, 0, qdepth
);
1657 return sdev
->queue_depth
;
1660 /* ------------------------------------------------------------
1663 static ssize_t
show_host_vhost_loc(struct device
*dev
,
1664 struct device_attribute
*attr
, char *buf
)
1666 struct Scsi_Host
*shost
= class_to_shost(dev
);
1667 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1670 len
= snprintf(buf
, sizeof(hostdata
->caps
.loc
), "%s\n",
1671 hostdata
->caps
.loc
);
1675 static struct device_attribute ibmvscsi_host_vhost_loc
= {
1677 .name
= "vhost_loc",
1680 .show
= show_host_vhost_loc
,
1683 static ssize_t
show_host_vhost_name(struct device
*dev
,
1684 struct device_attribute
*attr
, char *buf
)
1686 struct Scsi_Host
*shost
= class_to_shost(dev
);
1687 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1690 len
= snprintf(buf
, sizeof(hostdata
->caps
.name
), "%s\n",
1691 hostdata
->caps
.name
);
1695 static struct device_attribute ibmvscsi_host_vhost_name
= {
1697 .name
= "vhost_name",
1700 .show
= show_host_vhost_name
,
1703 static ssize_t
show_host_srp_version(struct device
*dev
,
1704 struct device_attribute
*attr
, char *buf
)
1706 struct Scsi_Host
*shost
= class_to_shost(dev
);
1707 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1710 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1711 hostdata
->madapter_info
.srp_version
);
1715 static struct device_attribute ibmvscsi_host_srp_version
= {
1717 .name
= "srp_version",
1720 .show
= show_host_srp_version
,
1723 static ssize_t
show_host_partition_name(struct device
*dev
,
1724 struct device_attribute
*attr
,
1727 struct Scsi_Host
*shost
= class_to_shost(dev
);
1728 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1731 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1732 hostdata
->madapter_info
.partition_name
);
1736 static struct device_attribute ibmvscsi_host_partition_name
= {
1738 .name
= "partition_name",
1741 .show
= show_host_partition_name
,
1744 static ssize_t
show_host_partition_number(struct device
*dev
,
1745 struct device_attribute
*attr
,
1748 struct Scsi_Host
*shost
= class_to_shost(dev
);
1749 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1752 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1753 hostdata
->madapter_info
.partition_number
);
1757 static struct device_attribute ibmvscsi_host_partition_number
= {
1759 .name
= "partition_number",
1762 .show
= show_host_partition_number
,
1765 static ssize_t
show_host_mad_version(struct device
*dev
,
1766 struct device_attribute
*attr
, char *buf
)
1768 struct Scsi_Host
*shost
= class_to_shost(dev
);
1769 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1772 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1773 hostdata
->madapter_info
.mad_version
);
1777 static struct device_attribute ibmvscsi_host_mad_version
= {
1779 .name
= "mad_version",
1782 .show
= show_host_mad_version
,
1785 static ssize_t
show_host_os_type(struct device
*dev
,
1786 struct device_attribute
*attr
, char *buf
)
1788 struct Scsi_Host
*shost
= class_to_shost(dev
);
1789 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1792 len
= snprintf(buf
, PAGE_SIZE
, "%d\n", hostdata
->madapter_info
.os_type
);
1796 static struct device_attribute ibmvscsi_host_os_type
= {
1801 .show
= show_host_os_type
,
1804 static ssize_t
show_host_config(struct device
*dev
,
1805 struct device_attribute
*attr
, char *buf
)
1807 struct Scsi_Host
*shost
= class_to_shost(dev
);
1808 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1810 /* returns null-terminated host config data */
1811 if (ibmvscsi_do_host_config(hostdata
, buf
, PAGE_SIZE
) == 0)
1817 static struct device_attribute ibmvscsi_host_config
= {
1822 .show
= show_host_config
,
1825 static struct device_attribute
*ibmvscsi_attrs
[] = {
1826 &ibmvscsi_host_vhost_loc
,
1827 &ibmvscsi_host_vhost_name
,
1828 &ibmvscsi_host_srp_version
,
1829 &ibmvscsi_host_partition_name
,
1830 &ibmvscsi_host_partition_number
,
1831 &ibmvscsi_host_mad_version
,
1832 &ibmvscsi_host_os_type
,
1833 &ibmvscsi_host_config
,
1837 /* ------------------------------------------------------------
1838 * SCSI driver registration
1840 static struct scsi_host_template driver_template
= {
1841 .module
= THIS_MODULE
,
1842 .name
= "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION
,
1843 .proc_name
= "ibmvscsi",
1844 .queuecommand
= ibmvscsi_queuecommand
,
1845 .eh_abort_handler
= ibmvscsi_eh_abort_handler
,
1846 .eh_device_reset_handler
= ibmvscsi_eh_device_reset_handler
,
1847 .eh_host_reset_handler
= ibmvscsi_eh_host_reset_handler
,
1848 .slave_configure
= ibmvscsi_slave_configure
,
1849 .change_queue_depth
= ibmvscsi_change_queue_depth
,
1850 .cmd_per_lun
= IBMVSCSI_CMDS_PER_LUN_DEFAULT
,
1851 .can_queue
= IBMVSCSI_MAX_REQUESTS_DEFAULT
,
1853 .sg_tablesize
= SG_ALL
,
1854 .use_clustering
= ENABLE_CLUSTERING
,
1855 .shost_attrs
= ibmvscsi_attrs
,
1859 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
1861 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1864 * Number of bytes of IO data the driver will need to perform well.
1866 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev
*vdev
)
1868 /* iu_storage data allocated in initialize_event_pool */
1869 unsigned long desired_io
= max_events
* sizeof(union viosrp_iu
);
1871 /* add io space for sg data */
1872 desired_io
+= (IBMVSCSI_MAX_SECTORS_DEFAULT
* 512 *
1873 IBMVSCSI_CMDS_PER_LUN_DEFAULT
);
1879 * Called by bus code for each adapter
1881 static int ibmvscsi_probe(struct vio_dev
*vdev
, const struct vio_device_id
*id
)
1883 struct ibmvscsi_host_data
*hostdata
;
1884 struct Scsi_Host
*host
;
1885 struct device
*dev
= &vdev
->dev
;
1886 struct srp_rport_identifiers ids
;
1887 struct srp_rport
*rport
;
1888 unsigned long wait_switch
= 0;
1891 dev_set_drvdata(&vdev
->dev
, NULL
);
1893 host
= scsi_host_alloc(&driver_template
, sizeof(*hostdata
));
1895 dev_err(&vdev
->dev
, "couldn't allocate host data\n");
1896 goto scsi_host_alloc_failed
;
1899 host
->transportt
= ibmvscsi_transport_template
;
1900 hostdata
= shost_priv(host
);
1901 memset(hostdata
, 0x00, sizeof(*hostdata
));
1902 INIT_LIST_HEAD(&hostdata
->sent
);
1903 hostdata
->host
= host
;
1904 hostdata
->dev
= dev
;
1905 atomic_set(&hostdata
->request_limit
, -1);
1906 hostdata
->host
->max_sectors
= IBMVSCSI_MAX_SECTORS_DEFAULT
;
1908 if (map_persist_bufs(hostdata
)) {
1909 dev_err(&vdev
->dev
, "couldn't map persistent buffers\n");
1910 goto persist_bufs_failed
;
1913 rc
= ibmvscsi_ops
->init_crq_queue(&hostdata
->queue
, hostdata
, max_events
);
1914 if (rc
!= 0 && rc
!= H_RESOURCE
) {
1915 dev_err(&vdev
->dev
, "couldn't initialize crq. rc=%d\n", rc
);
1916 goto init_crq_failed
;
1918 if (initialize_event_pool(&hostdata
->pool
, max_events
, hostdata
) != 0) {
1919 dev_err(&vdev
->dev
, "couldn't initialize event pool\n");
1920 goto init_pool_failed
;
1924 host
->max_id
= max_id
;
1925 host
->max_channel
= max_channel
;
1926 host
->max_cmd_len
= 16;
1928 if (scsi_add_host(hostdata
->host
, hostdata
->dev
))
1929 goto add_host_failed
;
1931 /* we don't have a proper target_port_id so let's use the fake one */
1932 memcpy(ids
.port_id
, hostdata
->madapter_info
.partition_name
,
1933 sizeof(ids
.port_id
));
1934 ids
.roles
= SRP_RPORT_ROLE_TARGET
;
1935 rport
= srp_rport_add(host
, &ids
);
1937 goto add_srp_port_failed
;
1939 /* Try to send an initialization message. Note that this is allowed
1940 * to fail if the other end is not acive. In that case we don't
1943 if (ibmvscsi_ops
->send_crq(hostdata
, 0xC001000000000000LL
, 0) == 0
1944 || rc
== H_RESOURCE
) {
1946 * Wait around max init_timeout secs for the adapter to finish
1947 * initializing. When we are done initializing, we will have a
1948 * valid request_limit. We don't want Linux scanning before
1951 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1952 time_before(jiffies
, wait_switch
) &&
1953 atomic_read(&hostdata
->request_limit
) < 2;) {
1958 /* if we now have a valid request_limit, initiate a scan */
1959 if (atomic_read(&hostdata
->request_limit
) > 0)
1960 scsi_scan_host(host
);
1963 dev_set_drvdata(&vdev
->dev
, hostdata
);
1966 add_srp_port_failed
:
1967 scsi_remove_host(hostdata
->host
);
1969 release_event_pool(&hostdata
->pool
, hostdata
);
1971 ibmvscsi_ops
->release_crq_queue(&hostdata
->queue
, hostdata
, max_events
);
1973 unmap_persist_bufs(hostdata
);
1974 persist_bufs_failed
:
1975 scsi_host_put(host
);
1976 scsi_host_alloc_failed
:
1980 static int ibmvscsi_remove(struct vio_dev
*vdev
)
1982 struct ibmvscsi_host_data
*hostdata
= dev_get_drvdata(&vdev
->dev
);
1983 unmap_persist_bufs(hostdata
);
1984 release_event_pool(&hostdata
->pool
, hostdata
);
1985 ibmvscsi_ops
->release_crq_queue(&hostdata
->queue
, hostdata
,
1988 srp_remove_host(hostdata
->host
);
1989 scsi_remove_host(hostdata
->host
);
1990 scsi_host_put(hostdata
->host
);
1996 * ibmvscsi_resume: Resume from suspend
1997 * @dev: device struct
1999 * We may have lost an interrupt across suspend/resume, so kick the
2002 static int ibmvscsi_resume(struct device
*dev
)
2004 struct ibmvscsi_host_data
*hostdata
= dev_get_drvdata(dev
);
2005 return ibmvscsi_ops
->resume(hostdata
);
2009 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
2012 static struct vio_device_id ibmvscsi_device_table
[] __devinitdata
= {
2013 {"vscsi", "IBM,v-scsi"},
2016 MODULE_DEVICE_TABLE(vio
, ibmvscsi_device_table
);
2018 static struct dev_pm_ops ibmvscsi_pm_ops
= {
2019 .resume
= ibmvscsi_resume
2022 static struct vio_driver ibmvscsi_driver
= {
2023 .id_table
= ibmvscsi_device_table
,
2024 .probe
= ibmvscsi_probe
,
2025 .remove
= ibmvscsi_remove
,
2026 .get_desired_dma
= ibmvscsi_get_desired_dma
,
2029 .owner
= THIS_MODULE
,
2030 .pm
= &ibmvscsi_pm_ops
,
2034 static struct srp_function_template ibmvscsi_transport_functions
= {
2037 int __init
ibmvscsi_module_init(void)
2041 /* Ensure we have two requests to do error recovery */
2042 driver_template
.can_queue
= max_requests
;
2043 max_events
= max_requests
+ 2;
2045 if (firmware_has_feature(FW_FEATURE_ISERIES
))
2046 ibmvscsi_ops
= &iseriesvscsi_ops
;
2047 else if (firmware_has_feature(FW_FEATURE_VIO
))
2048 ibmvscsi_ops
= &rpavscsi_ops
;
2052 ibmvscsi_transport_template
=
2053 srp_attach_transport(&ibmvscsi_transport_functions
);
2054 if (!ibmvscsi_transport_template
)
2057 ret
= vio_register_driver(&ibmvscsi_driver
);
2059 srp_release_transport(ibmvscsi_transport_template
);
2063 void __exit
ibmvscsi_module_exit(void)
2065 vio_unregister_driver(&ibmvscsi_driver
);
2066 srp_release_transport(ibmvscsi_transport_template
);
2069 module_init(ibmvscsi_module_init
);
2070 module_exit(ibmvscsi_module_exit
);