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 <linux/kthread.h>
77 #include <asm/firmware.h>
79 #include <scsi/scsi.h>
80 #include <scsi/scsi_cmnd.h>
81 #include <scsi/scsi_host.h>
82 #include <scsi/scsi_device.h>
83 #include <scsi/scsi_transport_srp.h>
86 /* The values below are somewhat arbitrary default values, but
87 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
88 * Note that there are 3 bits of channel value, 6 bits of id, and
91 static int max_id
= 64;
92 static int max_channel
= 3;
93 static int init_timeout
= 300;
94 static int login_timeout
= 60;
95 static int info_timeout
= 30;
96 static int abort_timeout
= 60;
97 static int reset_timeout
= 60;
98 static int max_requests
= IBMVSCSI_MAX_REQUESTS_DEFAULT
;
99 static int max_events
= IBMVSCSI_MAX_REQUESTS_DEFAULT
+ 2;
100 static int fast_fail
= 1;
101 static int client_reserve
= 1;
103 static struct scsi_transport_template
*ibmvscsi_transport_template
;
105 #define IBMVSCSI_VERSION "1.5.8"
107 static struct ibmvscsi_ops
*ibmvscsi_ops
;
109 MODULE_DESCRIPTION("IBM Virtual SCSI");
110 MODULE_AUTHOR("Dave Boutcher");
111 MODULE_LICENSE("GPL");
112 MODULE_VERSION(IBMVSCSI_VERSION
);
114 module_param_named(max_id
, max_id
, int, S_IRUGO
| S_IWUSR
);
115 MODULE_PARM_DESC(max_id
, "Largest ID value for each channel");
116 module_param_named(max_channel
, max_channel
, int, S_IRUGO
| S_IWUSR
);
117 MODULE_PARM_DESC(max_channel
, "Largest channel value");
118 module_param_named(init_timeout
, init_timeout
, int, S_IRUGO
| S_IWUSR
);
119 MODULE_PARM_DESC(init_timeout
, "Initialization timeout in seconds");
120 module_param_named(max_requests
, max_requests
, int, S_IRUGO
);
121 MODULE_PARM_DESC(max_requests
, "Maximum requests for this adapter");
122 module_param_named(fast_fail
, fast_fail
, int, S_IRUGO
| S_IWUSR
);
123 MODULE_PARM_DESC(fast_fail
, "Enable fast fail. [Default=1]");
124 module_param_named(client_reserve
, client_reserve
, int, S_IRUGO
);
125 MODULE_PARM_DESC(client_reserve
, "Attempt client managed reserve/release");
127 /* ------------------------------------------------------------
128 * Routines for the event pool and event structs
131 * initialize_event_pool: - Allocates and initializes the event pool for a host
132 * @pool: event_pool to be initialized
133 * @size: Number of events in pool
134 * @hostdata: ibmvscsi_host_data who owns the event pool
136 * Returns zero on success.
138 static int initialize_event_pool(struct event_pool
*pool
,
139 int size
, struct ibmvscsi_host_data
*hostdata
)
145 pool
->events
= kcalloc(pool
->size
, sizeof(*pool
->events
), GFP_KERNEL
);
150 dma_alloc_coherent(hostdata
->dev
,
151 pool
->size
* sizeof(*pool
->iu_storage
),
153 if (!pool
->iu_storage
) {
158 for (i
= 0; i
< pool
->size
; ++i
) {
159 struct srp_event_struct
*evt
= &pool
->events
[i
];
160 memset(&evt
->crq
, 0x00, sizeof(evt
->crq
));
161 atomic_set(&evt
->free
, 1);
162 evt
->crq
.valid
= 0x80;
163 evt
->crq
.IU_length
= sizeof(*evt
->xfer_iu
);
164 evt
->crq
.IU_data_ptr
= pool
->iu_token
+
165 sizeof(*evt
->xfer_iu
) * i
;
166 evt
->xfer_iu
= pool
->iu_storage
+ i
;
167 evt
->hostdata
= hostdata
;
168 evt
->ext_list
= NULL
;
169 evt
->ext_list_token
= 0;
176 * release_event_pool: - Frees memory of an event pool of a host
177 * @pool: event_pool to be released
178 * @hostdata: ibmvscsi_host_data who owns the even pool
180 * Returns zero on success.
182 static void release_event_pool(struct event_pool
*pool
,
183 struct ibmvscsi_host_data
*hostdata
)
186 for (i
= 0; i
< pool
->size
; ++i
) {
187 if (atomic_read(&pool
->events
[i
].free
) != 1)
189 if (pool
->events
[i
].ext_list
) {
190 dma_free_coherent(hostdata
->dev
,
191 SG_ALL
* sizeof(struct srp_direct_buf
),
192 pool
->events
[i
].ext_list
,
193 pool
->events
[i
].ext_list_token
);
197 dev_warn(hostdata
->dev
, "releasing event pool with %d "
198 "events still in use?\n", in_use
);
200 dma_free_coherent(hostdata
->dev
,
201 pool
->size
* sizeof(*pool
->iu_storage
),
202 pool
->iu_storage
, pool
->iu_token
);
206 * valid_event_struct: - Determines if event is valid.
207 * @pool: event_pool that contains the event
208 * @evt: srp_event_struct to be checked for validity
210 * Returns zero if event is invalid, one otherwise.
212 static int valid_event_struct(struct event_pool
*pool
,
213 struct srp_event_struct
*evt
)
215 int index
= evt
- pool
->events
;
216 if (index
< 0 || index
>= pool
->size
) /* outside of bounds */
218 if (evt
!= pool
->events
+ index
) /* unaligned */
224 * ibmvscsi_free-event_struct: - Changes status of event to "free"
225 * @pool: event_pool that contains the event
226 * @evt: srp_event_struct to be modified
229 static void free_event_struct(struct event_pool
*pool
,
230 struct srp_event_struct
*evt
)
232 if (!valid_event_struct(pool
, evt
)) {
233 dev_err(evt
->hostdata
->dev
, "Freeing invalid event_struct %p "
234 "(not in pool %p)\n", evt
, pool
->events
);
237 if (atomic_inc_return(&evt
->free
) != 1) {
238 dev_err(evt
->hostdata
->dev
, "Freeing event_struct %p "
239 "which is not in use!\n", evt
);
245 * get_evt_struct: - Gets the next free event in pool
246 * @pool: event_pool that contains the events to be searched
248 * Returns the next event in "free" state, and NULL if none are free.
249 * Note that no synchronization is done here, we assume the host_lock
250 * will syncrhonze things.
252 static struct srp_event_struct
*get_event_struct(struct event_pool
*pool
)
255 int poolsize
= pool
->size
;
256 int offset
= pool
->next
;
258 for (i
= 0; i
< poolsize
; i
++) {
259 offset
= (offset
+ 1) % poolsize
;
260 if (!atomic_dec_if_positive(&pool
->events
[offset
].free
)) {
262 return &pool
->events
[offset
];
266 printk(KERN_ERR
"ibmvscsi: found no event struct in pool!\n");
271 * init_event_struct: Initialize fields in an event struct that are always
274 * @done: Routine to call when the event is responded to
275 * @format: SRP or MAD format
276 * @timeout: timeout value set in the CRQ
278 static void init_event_struct(struct srp_event_struct
*evt_struct
,
279 void (*done
) (struct srp_event_struct
*),
283 evt_struct
->cmnd
= NULL
;
284 evt_struct
->cmnd_done
= NULL
;
285 evt_struct
->sync_srp
= NULL
;
286 evt_struct
->crq
.format
= format
;
287 evt_struct
->crq
.timeout
= timeout
;
288 evt_struct
->done
= done
;
291 /* ------------------------------------------------------------
292 * Routines for receiving SCSI responses from the hosting partition
296 * set_srp_direction: Set the fields in the srp related to data
297 * direction and number of buffers based on the direction in
298 * the scsi_cmnd and the number of buffers
300 static void set_srp_direction(struct scsi_cmnd
*cmd
,
301 struct srp_cmd
*srp_cmd
,
310 fmt
= SRP_DATA_DESC_DIRECT
;
312 fmt
= SRP_DATA_DESC_INDIRECT
;
313 numbuf
= min(numbuf
, MAX_INDIRECT_BUFS
);
315 if (cmd
->sc_data_direction
== DMA_TO_DEVICE
)
316 srp_cmd
->data_out_desc_cnt
= numbuf
;
318 srp_cmd
->data_in_desc_cnt
= numbuf
;
321 if (cmd
->sc_data_direction
== DMA_TO_DEVICE
)
322 srp_cmd
->buf_fmt
= fmt
<< 4;
324 srp_cmd
->buf_fmt
= fmt
;
328 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
329 * @cmd: srp_cmd whose additional_data member will be unmapped
330 * @dev: device for which the memory is mapped
333 static void unmap_cmd_data(struct srp_cmd
*cmd
,
334 struct srp_event_struct
*evt_struct
,
339 out_fmt
= cmd
->buf_fmt
>> 4;
340 in_fmt
= cmd
->buf_fmt
& ((1U << 4) - 1);
342 if (out_fmt
== SRP_NO_DATA_DESC
&& in_fmt
== SRP_NO_DATA_DESC
)
345 if (evt_struct
->cmnd
)
346 scsi_dma_unmap(evt_struct
->cmnd
);
349 static int map_sg_list(struct scsi_cmnd
*cmd
, int nseg
,
350 struct srp_direct_buf
*md
)
353 struct scatterlist
*sg
;
354 u64 total_length
= 0;
356 scsi_for_each_sg(cmd
, sg
, nseg
, i
) {
357 struct srp_direct_buf
*descr
= md
+ i
;
358 descr
->va
= sg_dma_address(sg
);
359 descr
->len
= sg_dma_len(sg
);
361 total_length
+= sg_dma_len(sg
);
367 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
368 * @cmd: Scsi_Cmnd with the scatterlist
369 * @srp_cmd: srp_cmd that contains the memory descriptor
370 * @dev: device for which to map dma memory
372 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
373 * Returns 1 on success.
375 static int map_sg_data(struct scsi_cmnd
*cmd
,
376 struct srp_event_struct
*evt_struct
,
377 struct srp_cmd
*srp_cmd
, struct device
*dev
)
381 u64 total_length
= 0;
382 struct srp_direct_buf
*data
=
383 (struct srp_direct_buf
*) srp_cmd
->add_data
;
384 struct srp_indirect_buf
*indirect
=
385 (struct srp_indirect_buf
*) data
;
387 sg_mapped
= scsi_dma_map(cmd
);
390 else if (sg_mapped
< 0)
393 set_srp_direction(cmd
, srp_cmd
, sg_mapped
);
395 /* special case; we can use a single direct descriptor */
396 if (sg_mapped
== 1) {
397 map_sg_list(cmd
, sg_mapped
, data
);
401 indirect
->table_desc
.va
= 0;
402 indirect
->table_desc
.len
= sg_mapped
* sizeof(struct srp_direct_buf
);
403 indirect
->table_desc
.key
= 0;
405 if (sg_mapped
<= MAX_INDIRECT_BUFS
) {
406 total_length
= map_sg_list(cmd
, sg_mapped
,
407 &indirect
->desc_list
[0]);
408 indirect
->len
= total_length
;
412 /* get indirect table */
413 if (!evt_struct
->ext_list
) {
414 evt_struct
->ext_list
= (struct srp_direct_buf
*)
415 dma_alloc_coherent(dev
,
416 SG_ALL
* sizeof(struct srp_direct_buf
),
417 &evt_struct
->ext_list_token
, 0);
418 if (!evt_struct
->ext_list
) {
419 if (!firmware_has_feature(FW_FEATURE_CMO
))
420 sdev_printk(KERN_ERR
, cmd
->device
,
421 "Can't allocate memory "
422 "for indirect table\n");
428 total_length
= map_sg_list(cmd
, sg_mapped
, evt_struct
->ext_list
);
430 indirect
->len
= total_length
;
431 indirect
->table_desc
.va
= evt_struct
->ext_list_token
;
432 indirect
->table_desc
.len
= sg_mapped
* sizeof(indirect
->desc_list
[0]);
433 memcpy(indirect
->desc_list
, evt_struct
->ext_list
,
434 MAX_INDIRECT_BUFS
* sizeof(struct srp_direct_buf
));
439 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
440 * @cmd: struct scsi_cmnd with the memory to be mapped
441 * @srp_cmd: srp_cmd that contains the memory descriptor
442 * @dev: dma device for which to map dma memory
444 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
445 * Returns 1 on success.
447 static int map_data_for_srp_cmd(struct scsi_cmnd
*cmd
,
448 struct srp_event_struct
*evt_struct
,
449 struct srp_cmd
*srp_cmd
, struct device
*dev
)
451 switch (cmd
->sc_data_direction
) {
452 case DMA_FROM_DEVICE
:
457 case DMA_BIDIRECTIONAL
:
458 sdev_printk(KERN_ERR
, cmd
->device
,
459 "Can't map DMA_BIDIRECTIONAL to read/write\n");
462 sdev_printk(KERN_ERR
, cmd
->device
,
463 "Unknown data direction 0x%02x; can't map!\n",
464 cmd
->sc_data_direction
);
468 return map_sg_data(cmd
, evt_struct
, srp_cmd
, dev
);
472 * purge_requests: Our virtual adapter just shut down. purge any sent requests
473 * @hostdata: the adapter
475 static void purge_requests(struct ibmvscsi_host_data
*hostdata
, int error_code
)
477 struct srp_event_struct
*evt
;
480 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
481 while (!list_empty(&hostdata
->sent
)) {
482 evt
= list_first_entry(&hostdata
->sent
, struct srp_event_struct
, list
);
483 list_del(&evt
->list
);
484 del_timer(&evt
->timer
);
486 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
488 evt
->cmnd
->result
= (error_code
<< 16);
489 unmap_cmd_data(&evt
->iu
.srp
.cmd
, evt
,
492 evt
->cmnd_done(evt
->cmnd
);
493 } else if (evt
->done
)
495 free_event_struct(&evt
->hostdata
->pool
, evt
);
496 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
498 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
502 * ibmvscsi_reset_host - Reset the connection to the server
503 * @hostdata: struct ibmvscsi_host_data to reset
505 static void ibmvscsi_reset_host(struct ibmvscsi_host_data
*hostdata
)
507 scsi_block_requests(hostdata
->host
);
508 atomic_set(&hostdata
->request_limit
, 0);
510 purge_requests(hostdata
, DID_ERROR
);
511 hostdata
->reset_crq
= 1;
512 wake_up(&hostdata
->work_wait_q
);
516 * ibmvscsi_timeout - Internal command timeout handler
517 * @evt_struct: struct srp_event_struct that timed out
519 * Called when an internally generated command times out
521 static void ibmvscsi_timeout(struct srp_event_struct
*evt_struct
)
523 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
525 dev_err(hostdata
->dev
, "Command timed out (%x). Resetting connection\n",
526 evt_struct
->iu
.srp
.cmd
.opcode
);
528 ibmvscsi_reset_host(hostdata
);
532 /* ------------------------------------------------------------
533 * Routines for sending and receiving SRPs
536 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
537 * @evt_struct: evt_struct to be sent
538 * @hostdata: ibmvscsi_host_data of host
539 * @timeout: timeout in seconds - 0 means do not time command
541 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
542 * Note that this routine assumes that host_lock is held for synchronization
544 static int ibmvscsi_send_srp_event(struct srp_event_struct
*evt_struct
,
545 struct ibmvscsi_host_data
*hostdata
,
546 unsigned long timeout
)
548 u64
*crq_as_u64
= (u64
*) &evt_struct
->crq
;
549 int request_status
= 0;
552 /* If we have exhausted our request limit, just fail this request,
553 * unless it is for a reset or abort.
554 * Note that there are rare cases involving driver generated requests
555 * (such as task management requests) that the mid layer may think we
556 * can handle more requests (can_queue) when we actually can't
558 if (evt_struct
->crq
.format
== VIOSRP_SRP_FORMAT
) {
560 atomic_dec_if_positive(&hostdata
->request_limit
);
561 /* If request limit was -1 when we started, it is now even
564 if (request_status
< -1)
566 /* Otherwise, we may have run out of requests. */
567 /* If request limit was 0 when we started the adapter is in the
568 * process of performing a login with the server adapter, or
569 * we may have run out of requests.
571 else if (request_status
== -1 &&
572 evt_struct
->iu
.srp
.login_req
.opcode
!= SRP_LOGIN_REQ
)
574 /* Abort and reset calls should make it through.
575 * Nothing except abort and reset should use the last two
576 * slots unless we had two or less to begin with.
578 else if (request_status
< 2 &&
579 evt_struct
->iu
.srp
.cmd
.opcode
!= SRP_TSK_MGMT
) {
580 /* In the case that we have less than two requests
581 * available, check the server limit as a combination
582 * of the request limit and the number of requests
583 * in-flight (the size of the send list). If the
584 * server limit is greater than 2, return busy so
585 * that the last two are reserved for reset and abort.
587 int server_limit
= request_status
;
588 struct srp_event_struct
*tmp_evt
;
590 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
594 if (server_limit
> 2)
599 /* Copy the IU into the transfer area */
600 *evt_struct
->xfer_iu
= evt_struct
->iu
;
601 evt_struct
->xfer_iu
->srp
.rsp
.tag
= (u64
)evt_struct
;
603 /* Add this to the sent list. We need to do this
604 * before we actually send
605 * in case it comes back REALLY fast
607 list_add_tail(&evt_struct
->list
, &hostdata
->sent
);
609 init_timer(&evt_struct
->timer
);
611 evt_struct
->timer
.data
= (unsigned long) evt_struct
;
612 evt_struct
->timer
.expires
= jiffies
+ (timeout
* HZ
);
613 evt_struct
->timer
.function
= (void (*)(unsigned long))ibmvscsi_timeout
;
614 add_timer(&evt_struct
->timer
);
618 ibmvscsi_ops
->send_crq(hostdata
, crq_as_u64
[0], crq_as_u64
[1])) != 0) {
619 list_del(&evt_struct
->list
);
620 del_timer(&evt_struct
->timer
);
622 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
623 * Firmware will send a CRQ with a transport event (0xFF) to
624 * tell this client what has happened to the transport. This
625 * will be handled in ibmvscsi_handle_crq()
627 if (rc
== H_CLOSED
) {
628 dev_warn(hostdata
->dev
, "send warning. "
629 "Receive queue closed, will retry.\n");
632 dev_err(hostdata
->dev
, "send error %d\n", rc
);
633 atomic_inc(&hostdata
->request_limit
);
640 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
642 free_event_struct(&hostdata
->pool
, evt_struct
);
643 if (request_status
!= -1)
644 atomic_inc(&hostdata
->request_limit
);
645 return SCSI_MLQUEUE_HOST_BUSY
;
648 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
650 if (evt_struct
->cmnd
!= NULL
) {
651 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
652 evt_struct
->cmnd_done(evt_struct
->cmnd
);
653 } else if (evt_struct
->done
)
654 evt_struct
->done(evt_struct
);
656 free_event_struct(&hostdata
->pool
, evt_struct
);
661 * handle_cmd_rsp: - Handle responses from commands
662 * @evt_struct: srp_event_struct to be handled
664 * Used as a callback by when sending scsi cmds.
665 * Gets called by ibmvscsi_handle_crq()
667 static void handle_cmd_rsp(struct srp_event_struct
*evt_struct
)
669 struct srp_rsp
*rsp
= &evt_struct
->xfer_iu
->srp
.rsp
;
670 struct scsi_cmnd
*cmnd
= evt_struct
->cmnd
;
672 if (unlikely(rsp
->opcode
!= SRP_RSP
)) {
673 if (printk_ratelimit())
674 dev_warn(evt_struct
->hostdata
->dev
,
675 "bad SRP RSP type %d\n", rsp
->opcode
);
679 cmnd
->result
|= rsp
->status
;
680 if (((cmnd
->result
>> 1) & 0x1f) == CHECK_CONDITION
)
681 memcpy(cmnd
->sense_buffer
,
683 rsp
->sense_data_len
);
684 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
,
686 evt_struct
->hostdata
->dev
);
688 if (rsp
->flags
& SRP_RSP_FLAG_DOOVER
)
689 scsi_set_resid(cmnd
, rsp
->data_out_res_cnt
);
690 else if (rsp
->flags
& SRP_RSP_FLAG_DIOVER
)
691 scsi_set_resid(cmnd
, rsp
->data_in_res_cnt
);
694 if (evt_struct
->cmnd_done
)
695 evt_struct
->cmnd_done(cmnd
);
699 * lun_from_dev: - Returns the lun of the scsi device
700 * @dev: struct scsi_device
703 static inline u16
lun_from_dev(struct scsi_device
*dev
)
705 return (0x2 << 14) | (dev
->id
<< 8) | (dev
->channel
<< 5) | dev
->lun
;
709 * ibmvscsi_queue: - The queuecommand function of the scsi template
710 * @cmd: struct scsi_cmnd to be executed
711 * @done: Callback function to be called when cmd is completed
713 static int ibmvscsi_queuecommand(struct scsi_cmnd
*cmnd
,
714 void (*done
) (struct scsi_cmnd
*))
716 struct srp_cmd
*srp_cmd
;
717 struct srp_event_struct
*evt_struct
;
718 struct srp_indirect_buf
*indirect
;
719 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmnd
->device
->host
);
720 u16 lun
= lun_from_dev(cmnd
->device
);
723 cmnd
->result
= (DID_OK
<< 16);
724 evt_struct
= get_event_struct(&hostdata
->pool
);
726 return SCSI_MLQUEUE_HOST_BUSY
;
728 /* Set up the actual SRP IU */
729 srp_cmd
= &evt_struct
->iu
.srp
.cmd
;
730 memset(srp_cmd
, 0x00, SRP_MAX_IU_LEN
);
731 srp_cmd
->opcode
= SRP_CMD
;
732 memcpy(srp_cmd
->cdb
, cmnd
->cmnd
, sizeof(srp_cmd
->cdb
));
733 srp_cmd
->lun
= ((u64
) lun
) << 48;
735 if (!map_data_for_srp_cmd(cmnd
, evt_struct
, srp_cmd
, hostdata
->dev
)) {
736 if (!firmware_has_feature(FW_FEATURE_CMO
))
737 sdev_printk(KERN_ERR
, cmnd
->device
,
738 "couldn't convert cmd to srp_cmd\n");
739 free_event_struct(&hostdata
->pool
, evt_struct
);
740 return SCSI_MLQUEUE_HOST_BUSY
;
743 init_event_struct(evt_struct
,
746 cmnd
->request
->timeout
/HZ
);
748 evt_struct
->cmnd
= cmnd
;
749 evt_struct
->cmnd_done
= done
;
751 /* Fix up dma address of the buffer itself */
752 indirect
= (struct srp_indirect_buf
*) srp_cmd
->add_data
;
753 out_fmt
= srp_cmd
->buf_fmt
>> 4;
754 in_fmt
= srp_cmd
->buf_fmt
& ((1U << 4) - 1);
755 if ((in_fmt
== SRP_DATA_DESC_INDIRECT
||
756 out_fmt
== SRP_DATA_DESC_INDIRECT
) &&
757 indirect
->table_desc
.va
== 0) {
758 indirect
->table_desc
.va
= evt_struct
->crq
.IU_data_ptr
+
759 offsetof(struct srp_cmd
, add_data
) +
760 offsetof(struct srp_indirect_buf
, desc_list
);
763 return ibmvscsi_send_srp_event(evt_struct
, hostdata
, 0);
766 /* ------------------------------------------------------------
767 * Routines for driver initialization
771 * map_persist_bufs: - Pre-map persistent data for adapter logins
772 * @hostdata: ibmvscsi_host_data of host
774 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
775 * Return 1 on error, 0 on success.
777 static int map_persist_bufs(struct ibmvscsi_host_data
*hostdata
)
780 hostdata
->caps_addr
= dma_map_single(hostdata
->dev
, &hostdata
->caps
,
781 sizeof(hostdata
->caps
), DMA_BIDIRECTIONAL
);
783 if (dma_mapping_error(hostdata
->dev
, hostdata
->caps_addr
)) {
784 dev_err(hostdata
->dev
, "Unable to map capabilities buffer!\n");
788 hostdata
->adapter_info_addr
= dma_map_single(hostdata
->dev
,
789 &hostdata
->madapter_info
,
790 sizeof(hostdata
->madapter_info
),
792 if (dma_mapping_error(hostdata
->dev
, hostdata
->adapter_info_addr
)) {
793 dev_err(hostdata
->dev
, "Unable to map adapter info buffer!\n");
794 dma_unmap_single(hostdata
->dev
, hostdata
->caps_addr
,
795 sizeof(hostdata
->caps
), DMA_BIDIRECTIONAL
);
803 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
804 * @hostdata: ibmvscsi_host_data of host
806 * Unmap the capabilities and adapter info DMA buffers
808 static void unmap_persist_bufs(struct ibmvscsi_host_data
*hostdata
)
810 dma_unmap_single(hostdata
->dev
, hostdata
->caps_addr
,
811 sizeof(hostdata
->caps
), DMA_BIDIRECTIONAL
);
813 dma_unmap_single(hostdata
->dev
, hostdata
->adapter_info_addr
,
814 sizeof(hostdata
->madapter_info
), DMA_BIDIRECTIONAL
);
818 * login_rsp: - Handle response to SRP login request
819 * @evt_struct: srp_event_struct with the response
821 * Used as a "done" callback by when sending srp_login. Gets called
822 * by ibmvscsi_handle_crq()
824 static void login_rsp(struct srp_event_struct
*evt_struct
)
826 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
827 switch (evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
) {
828 case SRP_LOGIN_RSP
: /* it worked! */
830 case SRP_LOGIN_REJ
: /* refused! */
831 dev_info(hostdata
->dev
, "SRP_LOGIN_REJ reason %u\n",
832 evt_struct
->xfer_iu
->srp
.login_rej
.reason
);
834 atomic_set(&hostdata
->request_limit
, -1);
837 dev_err(hostdata
->dev
, "Invalid login response typecode 0x%02x!\n",
838 evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
);
840 atomic_set(&hostdata
->request_limit
, -1);
844 dev_info(hostdata
->dev
, "SRP_LOGIN succeeded\n");
845 hostdata
->client_migrated
= 0;
847 /* Now we know what the real request-limit is.
848 * This value is set rather than added to request_limit because
849 * request_limit could have been set to -1 by this client.
851 atomic_set(&hostdata
->request_limit
,
852 evt_struct
->xfer_iu
->srp
.login_rsp
.req_lim_delta
);
854 /* If we had any pending I/Os, kick them */
855 scsi_unblock_requests(hostdata
->host
);
859 * send_srp_login: - Sends the srp login
860 * @hostdata: ibmvscsi_host_data of host
862 * Returns zero if successful.
864 static int send_srp_login(struct ibmvscsi_host_data
*hostdata
)
868 struct srp_login_req
*login
;
869 struct srp_event_struct
*evt_struct
= get_event_struct(&hostdata
->pool
);
872 init_event_struct(evt_struct
, login_rsp
,
873 VIOSRP_SRP_FORMAT
, login_timeout
);
875 login
= &evt_struct
->iu
.srp
.login_req
;
876 memset(login
, 0, sizeof(*login
));
877 login
->opcode
= SRP_LOGIN_REQ
;
878 login
->req_it_iu_len
= sizeof(union srp_iu
);
879 login
->req_buf_fmt
= SRP_BUF_FORMAT_DIRECT
| SRP_BUF_FORMAT_INDIRECT
;
881 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
882 /* Start out with a request limit of 0, since this is negotiated in
883 * the login request we are just sending and login requests always
884 * get sent by the driver regardless of request_limit.
886 atomic_set(&hostdata
->request_limit
, 0);
888 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, login_timeout
* 2);
889 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
890 dev_info(hostdata
->dev
, "sent SRP login\n");
895 * capabilities_rsp: - Handle response to MAD adapter capabilities request
896 * @evt_struct: srp_event_struct with the response
898 * Used as a "done" callback by when sending adapter_info.
900 static void capabilities_rsp(struct srp_event_struct
*evt_struct
)
902 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
904 if (evt_struct
->xfer_iu
->mad
.capabilities
.common
.status
) {
905 dev_err(hostdata
->dev
, "error 0x%X getting capabilities info\n",
906 evt_struct
->xfer_iu
->mad
.capabilities
.common
.status
);
908 if (hostdata
->caps
.migration
.common
.server_support
!= SERVER_SUPPORTS_CAP
)
909 dev_info(hostdata
->dev
, "Partition migration not supported\n");
911 if (client_reserve
) {
912 if (hostdata
->caps
.reserve
.common
.server_support
==
914 dev_info(hostdata
->dev
, "Client reserve enabled\n");
916 dev_info(hostdata
->dev
, "Client reserve not supported\n");
920 send_srp_login(hostdata
);
924 * send_mad_capabilities: - Sends the mad capabilities request
925 * and stores the result so it can be retrieved with
926 * @hostdata: ibmvscsi_host_data of host
928 static void send_mad_capabilities(struct ibmvscsi_host_data
*hostdata
)
930 struct viosrp_capabilities
*req
;
931 struct srp_event_struct
*evt_struct
;
933 struct device_node
*of_node
= hostdata
->dev
->of_node
;
934 const char *location
;
936 evt_struct
= get_event_struct(&hostdata
->pool
);
939 init_event_struct(evt_struct
, capabilities_rsp
,
940 VIOSRP_MAD_FORMAT
, info_timeout
);
942 req
= &evt_struct
->iu
.mad
.capabilities
;
943 memset(req
, 0, sizeof(*req
));
945 hostdata
->caps
.flags
= CAP_LIST_SUPPORTED
;
946 if (hostdata
->client_migrated
)
947 hostdata
->caps
.flags
|= CLIENT_MIGRATED
;
949 strncpy(hostdata
->caps
.name
, dev_name(&hostdata
->host
->shost_gendev
),
950 sizeof(hostdata
->caps
.name
));
951 hostdata
->caps
.name
[sizeof(hostdata
->caps
.name
) - 1] = '\0';
953 location
= of_get_property(of_node
, "ibm,loc-code", NULL
);
954 location
= location
? location
: dev_name(hostdata
->dev
);
955 strncpy(hostdata
->caps
.loc
, location
, sizeof(hostdata
->caps
.loc
));
956 hostdata
->caps
.loc
[sizeof(hostdata
->caps
.loc
) - 1] = '\0';
958 req
->common
.type
= VIOSRP_CAPABILITIES_TYPE
;
959 req
->buffer
= hostdata
->caps_addr
;
961 hostdata
->caps
.migration
.common
.cap_type
= MIGRATION_CAPABILITIES
;
962 hostdata
->caps
.migration
.common
.length
= sizeof(hostdata
->caps
.migration
);
963 hostdata
->caps
.migration
.common
.server_support
= SERVER_SUPPORTS_CAP
;
964 hostdata
->caps
.migration
.ecl
= 1;
966 if (client_reserve
) {
967 hostdata
->caps
.reserve
.common
.cap_type
= RESERVATION_CAPABILITIES
;
968 hostdata
->caps
.reserve
.common
.length
= sizeof(hostdata
->caps
.reserve
);
969 hostdata
->caps
.reserve
.common
.server_support
= SERVER_SUPPORTS_CAP
;
970 hostdata
->caps
.reserve
.type
= CLIENT_RESERVE_SCSI_2
;
971 req
->common
.length
= sizeof(hostdata
->caps
);
973 req
->common
.length
= sizeof(hostdata
->caps
) - sizeof(hostdata
->caps
.reserve
);
975 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
976 if (ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2))
977 dev_err(hostdata
->dev
, "couldn't send CAPABILITIES_REQ!\n");
978 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
982 * fast_fail_rsp: - Handle response to MAD enable fast fail
983 * @evt_struct: srp_event_struct with the response
985 * Used as a "done" callback by when sending enable fast fail. Gets called
986 * by ibmvscsi_handle_crq()
988 static void fast_fail_rsp(struct srp_event_struct
*evt_struct
)
990 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
991 u8 status
= evt_struct
->xfer_iu
->mad
.fast_fail
.common
.status
;
993 if (status
== VIOSRP_MAD_NOT_SUPPORTED
)
994 dev_err(hostdata
->dev
, "fast_fail not supported in server\n");
995 else if (status
== VIOSRP_MAD_FAILED
)
996 dev_err(hostdata
->dev
, "fast_fail request failed\n");
997 else if (status
!= VIOSRP_MAD_SUCCESS
)
998 dev_err(hostdata
->dev
, "error 0x%X enabling fast_fail\n", status
);
1000 send_mad_capabilities(hostdata
);
1004 * init_host - Start host initialization
1005 * @hostdata: ibmvscsi_host_data of host
1007 * Returns zero if successful.
1009 static int enable_fast_fail(struct ibmvscsi_host_data
*hostdata
)
1012 unsigned long flags
;
1013 struct viosrp_fast_fail
*fast_fail_mad
;
1014 struct srp_event_struct
*evt_struct
;
1017 send_mad_capabilities(hostdata
);
1021 evt_struct
= get_event_struct(&hostdata
->pool
);
1022 BUG_ON(!evt_struct
);
1024 init_event_struct(evt_struct
, fast_fail_rsp
, VIOSRP_MAD_FORMAT
, info_timeout
);
1026 fast_fail_mad
= &evt_struct
->iu
.mad
.fast_fail
;
1027 memset(fast_fail_mad
, 0, sizeof(*fast_fail_mad
));
1028 fast_fail_mad
->common
.type
= VIOSRP_ENABLE_FAST_FAIL
;
1029 fast_fail_mad
->common
.length
= sizeof(*fast_fail_mad
);
1031 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1032 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2);
1033 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1038 * adapter_info_rsp: - Handle response to MAD adapter info request
1039 * @evt_struct: srp_event_struct with the response
1041 * Used as a "done" callback by when sending adapter_info. Gets called
1042 * by ibmvscsi_handle_crq()
1044 static void adapter_info_rsp(struct srp_event_struct
*evt_struct
)
1046 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
1048 if (evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
) {
1049 dev_err(hostdata
->dev
, "error %d getting adapter info\n",
1050 evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
);
1052 dev_info(hostdata
->dev
, "host srp version: %s, "
1053 "host partition %s (%d), OS %d, max io %u\n",
1054 hostdata
->madapter_info
.srp_version
,
1055 hostdata
->madapter_info
.partition_name
,
1056 hostdata
->madapter_info
.partition_number
,
1057 hostdata
->madapter_info
.os_type
,
1058 hostdata
->madapter_info
.port_max_txu
[0]);
1060 if (hostdata
->madapter_info
.port_max_txu
[0])
1061 hostdata
->host
->max_sectors
=
1062 hostdata
->madapter_info
.port_max_txu
[0] >> 9;
1064 if (hostdata
->madapter_info
.os_type
== 3 &&
1065 strcmp(hostdata
->madapter_info
.srp_version
, "1.6a") <= 0) {
1066 dev_err(hostdata
->dev
, "host (Ver. %s) doesn't support large transfers\n",
1067 hostdata
->madapter_info
.srp_version
);
1068 dev_err(hostdata
->dev
, "limiting scatterlists to %d\n",
1070 hostdata
->host
->sg_tablesize
= MAX_INDIRECT_BUFS
;
1073 if (hostdata
->madapter_info
.os_type
== 3) {
1074 enable_fast_fail(hostdata
);
1079 send_srp_login(hostdata
);
1083 * send_mad_adapter_info: - Sends the mad adapter info request
1084 * and stores the result so it can be retrieved with
1085 * sysfs. We COULD consider causing a failure if the
1086 * returned SRP version doesn't match ours.
1087 * @hostdata: ibmvscsi_host_data of host
1089 * Returns zero if successful.
1091 static void send_mad_adapter_info(struct ibmvscsi_host_data
*hostdata
)
1093 struct viosrp_adapter_info
*req
;
1094 struct srp_event_struct
*evt_struct
;
1095 unsigned long flags
;
1097 evt_struct
= get_event_struct(&hostdata
->pool
);
1098 BUG_ON(!evt_struct
);
1100 init_event_struct(evt_struct
,
1105 req
= &evt_struct
->iu
.mad
.adapter_info
;
1106 memset(req
, 0x00, sizeof(*req
));
1108 req
->common
.type
= VIOSRP_ADAPTER_INFO_TYPE
;
1109 req
->common
.length
= sizeof(hostdata
->madapter_info
);
1110 req
->buffer
= hostdata
->adapter_info_addr
;
1112 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1113 if (ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2))
1114 dev_err(hostdata
->dev
, "couldn't send ADAPTER_INFO_REQ!\n");
1115 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1119 * init_adapter: Start virtual adapter initialization sequence
1122 static void init_adapter(struct ibmvscsi_host_data
*hostdata
)
1124 send_mad_adapter_info(hostdata
);
1128 * sync_completion: Signal that a synchronous command has completed
1129 * Note that after returning from this call, the evt_struct is freed.
1130 * the caller waiting on this completion shouldn't touch the evt_struct
1133 static void sync_completion(struct srp_event_struct
*evt_struct
)
1135 /* copy the response back */
1136 if (evt_struct
->sync_srp
)
1137 *evt_struct
->sync_srp
= *evt_struct
->xfer_iu
;
1139 complete(&evt_struct
->comp
);
1143 * ibmvscsi_abort: Abort a command...from scsi host template
1144 * send this over to the server and wait synchronously for the response
1146 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd
*cmd
)
1148 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1149 struct srp_tsk_mgmt
*tsk_mgmt
;
1150 struct srp_event_struct
*evt
;
1151 struct srp_event_struct
*tmp_evt
, *found_evt
;
1152 union viosrp_iu srp_rsp
;
1154 unsigned long flags
;
1155 u16 lun
= lun_from_dev(cmd
->device
);
1156 unsigned long wait_switch
= 0;
1158 /* First, find this command in our sent list so we can figure
1159 * out the correct tag
1161 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1162 wait_switch
= jiffies
+ (init_timeout
* HZ
);
1165 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1166 if (tmp_evt
->cmnd
== cmd
) {
1167 found_evt
= tmp_evt
;
1173 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1177 evt
= get_event_struct(&hostdata
->pool
);
1179 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1180 sdev_printk(KERN_ERR
, cmd
->device
,
1181 "failed to allocate abort event\n");
1185 init_event_struct(evt
,
1190 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1192 /* Set up an abort SRP command */
1193 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1194 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1195 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1196 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_ABORT_TASK
;
1197 tsk_mgmt
->task_tag
= (u64
) found_evt
;
1199 evt
->sync_srp
= &srp_rsp
;
1201 init_completion(&evt
->comp
);
1202 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, abort_timeout
* 2);
1204 if (rsp_rc
!= SCSI_MLQUEUE_HOST_BUSY
)
1207 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1209 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1210 } while (time_before(jiffies
, wait_switch
));
1212 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1215 sdev_printk(KERN_ERR
, cmd
->device
,
1216 "failed to send abort() event. rc=%d\n", rsp_rc
);
1220 sdev_printk(KERN_INFO
, cmd
->device
,
1221 "aborting command. lun 0x%llx, tag 0x%llx\n",
1222 (((u64
) lun
) << 48), (u64
) found_evt
);
1224 wait_for_completion(&evt
->comp
);
1226 /* make sure we got a good response */
1227 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1228 if (printk_ratelimit())
1229 sdev_printk(KERN_WARNING
, cmd
->device
, "abort bad SRP RSP type %d\n",
1230 srp_rsp
.srp
.rsp
.opcode
);
1234 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1235 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1237 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1240 if (printk_ratelimit())
1241 sdev_printk(KERN_WARNING
, cmd
->device
,
1242 "abort code %d for task tag 0x%llx\n",
1243 rsp_rc
, tsk_mgmt
->task_tag
);
1247 /* Because we dropped the spinlock above, it's possible
1248 * The event is no longer in our list. Make sure it didn't
1249 * complete while we were aborting
1251 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1253 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1254 if (tmp_evt
->cmnd
== cmd
) {
1255 found_evt
= tmp_evt
;
1260 if (found_evt
== NULL
) {
1261 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1262 sdev_printk(KERN_INFO
, cmd
->device
, "aborted task tag 0x%llx completed\n",
1263 tsk_mgmt
->task_tag
);
1267 sdev_printk(KERN_INFO
, cmd
->device
, "successfully aborted task tag 0x%llx\n",
1268 tsk_mgmt
->task_tag
);
1270 cmd
->result
= (DID_ABORT
<< 16);
1271 list_del(&found_evt
->list
);
1272 unmap_cmd_data(&found_evt
->iu
.srp
.cmd
, found_evt
,
1273 found_evt
->hostdata
->dev
);
1274 free_event_struct(&found_evt
->hostdata
->pool
, found_evt
);
1275 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1276 atomic_inc(&hostdata
->request_limit
);
1281 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1282 * template send this over to the server and wait synchronously for the
1285 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd
*cmd
)
1287 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1288 struct srp_tsk_mgmt
*tsk_mgmt
;
1289 struct srp_event_struct
*evt
;
1290 struct srp_event_struct
*tmp_evt
, *pos
;
1291 union viosrp_iu srp_rsp
;
1293 unsigned long flags
;
1294 u16 lun
= lun_from_dev(cmd
->device
);
1295 unsigned long wait_switch
= 0;
1297 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1298 wait_switch
= jiffies
+ (init_timeout
* HZ
);
1300 evt
= get_event_struct(&hostdata
->pool
);
1302 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1303 sdev_printk(KERN_ERR
, cmd
->device
,
1304 "failed to allocate reset event\n");
1308 init_event_struct(evt
,
1313 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1315 /* Set up a lun reset SRP command */
1316 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1317 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1318 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1319 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_LUN_RESET
;
1321 evt
->sync_srp
= &srp_rsp
;
1323 init_completion(&evt
->comp
);
1324 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, reset_timeout
* 2);
1326 if (rsp_rc
!= SCSI_MLQUEUE_HOST_BUSY
)
1329 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1331 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1332 } while (time_before(jiffies
, wait_switch
));
1334 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1337 sdev_printk(KERN_ERR
, cmd
->device
,
1338 "failed to send reset event. rc=%d\n", rsp_rc
);
1342 sdev_printk(KERN_INFO
, cmd
->device
, "resetting device. lun 0x%llx\n",
1343 (((u64
) lun
) << 48));
1345 wait_for_completion(&evt
->comp
);
1347 /* make sure we got a good response */
1348 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1349 if (printk_ratelimit())
1350 sdev_printk(KERN_WARNING
, cmd
->device
, "reset bad SRP RSP type %d\n",
1351 srp_rsp
.srp
.rsp
.opcode
);
1355 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1356 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1358 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1361 if (printk_ratelimit())
1362 sdev_printk(KERN_WARNING
, cmd
->device
,
1363 "reset code %d for task tag 0x%llx\n",
1364 rsp_rc
, tsk_mgmt
->task_tag
);
1368 /* We need to find all commands for this LUN that have not yet been
1369 * responded to, and fail them with DID_RESET
1371 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1372 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
1373 if ((tmp_evt
->cmnd
) && (tmp_evt
->cmnd
->device
== cmd
->device
)) {
1375 tmp_evt
->cmnd
->result
= (DID_RESET
<< 16);
1376 list_del(&tmp_evt
->list
);
1377 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
, tmp_evt
,
1378 tmp_evt
->hostdata
->dev
);
1379 free_event_struct(&tmp_evt
->hostdata
->pool
,
1381 atomic_inc(&hostdata
->request_limit
);
1382 if (tmp_evt
->cmnd_done
)
1383 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
1384 else if (tmp_evt
->done
)
1385 tmp_evt
->done(tmp_evt
);
1388 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1393 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1394 * @cmd: struct scsi_cmnd having problems
1396 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd
*cmd
)
1398 unsigned long wait_switch
= 0;
1399 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1401 dev_err(hostdata
->dev
, "Resetting connection due to error recovery\n");
1403 ibmvscsi_reset_host(hostdata
);
1405 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1406 time_before(jiffies
, wait_switch
) &&
1407 atomic_read(&hostdata
->request_limit
) < 2;) {
1412 if (atomic_read(&hostdata
->request_limit
) <= 0)
1419 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1420 * @crq: Command/Response queue
1421 * @hostdata: ibmvscsi_host_data of host
1424 void ibmvscsi_handle_crq(struct viosrp_crq
*crq
,
1425 struct ibmvscsi_host_data
*hostdata
)
1428 unsigned long flags
;
1429 struct srp_event_struct
*evt_struct
=
1430 (struct srp_event_struct
*)crq
->IU_data_ptr
;
1431 switch (crq
->valid
) {
1432 case 0xC0: /* initialization */
1433 switch (crq
->format
) {
1434 case 0x01: /* Initialization message */
1435 dev_info(hostdata
->dev
, "partner initialized\n");
1436 /* Send back a response */
1437 if ((rc
= ibmvscsi_ops
->send_crq(hostdata
,
1438 0xC002000000000000LL
, 0)) == 0) {
1440 init_adapter(hostdata
);
1442 dev_err(hostdata
->dev
, "Unable to send init rsp. rc=%ld\n", rc
);
1446 case 0x02: /* Initialization response */
1447 dev_info(hostdata
->dev
, "partner initialization complete\n");
1450 init_adapter(hostdata
);
1453 dev_err(hostdata
->dev
, "unknown crq message type: %d\n", crq
->format
);
1456 case 0xFF: /* Hypervisor telling us the connection is closed */
1457 scsi_block_requests(hostdata
->host
);
1458 atomic_set(&hostdata
->request_limit
, 0);
1459 if (crq
->format
== 0x06) {
1460 /* We need to re-setup the interpartition connection */
1461 dev_info(hostdata
->dev
, "Re-enabling adapter!\n");
1462 hostdata
->client_migrated
= 1;
1463 hostdata
->reenable_crq
= 1;
1464 purge_requests(hostdata
, DID_REQUEUE
);
1465 wake_up(&hostdata
->work_wait_q
);
1467 dev_err(hostdata
->dev
, "Virtual adapter failed rc %d!\n",
1469 ibmvscsi_reset_host(hostdata
);
1472 case 0x80: /* real payload */
1475 dev_err(hostdata
->dev
, "got an invalid message type 0x%02x\n",
1480 /* The only kind of payload CRQs we should get are responses to
1481 * things we send. Make sure this response is to something we
1484 if (!valid_event_struct(&hostdata
->pool
, evt_struct
)) {
1485 dev_err(hostdata
->dev
, "returned correlation_token 0x%p is invalid!\n",
1486 (void *)crq
->IU_data_ptr
);
1490 if (atomic_read(&evt_struct
->free
)) {
1491 dev_err(hostdata
->dev
, "received duplicate correlation_token 0x%p!\n",
1492 (void *)crq
->IU_data_ptr
);
1496 if (crq
->format
== VIOSRP_SRP_FORMAT
)
1497 atomic_add(evt_struct
->xfer_iu
->srp
.rsp
.req_lim_delta
,
1498 &hostdata
->request_limit
);
1500 del_timer(&evt_struct
->timer
);
1502 if ((crq
->status
!= VIOSRP_OK
&& crq
->status
!= VIOSRP_OK2
) && evt_struct
->cmnd
)
1503 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
1504 if (evt_struct
->done
)
1505 evt_struct
->done(evt_struct
);
1507 dev_err(hostdata
->dev
, "returned done() is NULL; not running it!\n");
1510 * Lock the host_lock before messing with these structures, since we
1511 * are running in a task context
1513 spin_lock_irqsave(evt_struct
->hostdata
->host
->host_lock
, flags
);
1514 list_del(&evt_struct
->list
);
1515 free_event_struct(&evt_struct
->hostdata
->pool
, evt_struct
);
1516 spin_unlock_irqrestore(evt_struct
->hostdata
->host
->host_lock
, flags
);
1520 * ibmvscsi_get_host_config: Send the command to the server to get host
1521 * configuration data. The data is opaque to us.
1523 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data
*hostdata
,
1524 unsigned char *buffer
, int length
)
1526 struct viosrp_host_config
*host_config
;
1527 struct srp_event_struct
*evt_struct
;
1528 unsigned long flags
;
1532 evt_struct
= get_event_struct(&hostdata
->pool
);
1534 dev_err(hostdata
->dev
, "couldn't allocate event for HOST_CONFIG!\n");
1538 init_event_struct(evt_struct
,
1543 host_config
= &evt_struct
->iu
.mad
.host_config
;
1545 /* Set up a lun reset SRP command */
1546 memset(host_config
, 0x00, sizeof(*host_config
));
1547 host_config
->common
.type
= VIOSRP_HOST_CONFIG_TYPE
;
1548 host_config
->common
.length
= length
;
1549 host_config
->buffer
= addr
= dma_map_single(hostdata
->dev
, buffer
,
1553 if (dma_mapping_error(hostdata
->dev
, host_config
->buffer
)) {
1554 if (!firmware_has_feature(FW_FEATURE_CMO
))
1555 dev_err(hostdata
->dev
,
1556 "dma_mapping error getting host config\n");
1557 free_event_struct(&hostdata
->pool
, evt_struct
);
1561 init_completion(&evt_struct
->comp
);
1562 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1563 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2);
1564 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1566 wait_for_completion(&evt_struct
->comp
);
1567 dma_unmap_single(hostdata
->dev
, addr
, length
, DMA_BIDIRECTIONAL
);
1573 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1574 * @sdev: struct scsi_device device to configure
1576 * Enable allow_restart for a device if it is a disk. Adjust the
1577 * queue_depth here also as is required by the documentation for
1578 * struct scsi_host_template.
1580 static int ibmvscsi_slave_configure(struct scsi_device
*sdev
)
1582 struct Scsi_Host
*shost
= sdev
->host
;
1583 unsigned long lock_flags
= 0;
1585 spin_lock_irqsave(shost
->host_lock
, lock_flags
);
1586 if (sdev
->type
== TYPE_DISK
) {
1587 sdev
->allow_restart
= 1;
1588 blk_queue_rq_timeout(sdev
->request_queue
, 120 * HZ
);
1590 scsi_adjust_queue_depth(sdev
, 0, shost
->cmd_per_lun
);
1591 spin_unlock_irqrestore(shost
->host_lock
, lock_flags
);
1596 * ibmvscsi_change_queue_depth - Change the device's queue depth
1597 * @sdev: scsi device struct
1598 * @qdepth: depth to set
1599 * @reason: calling context
1604 static int ibmvscsi_change_queue_depth(struct scsi_device
*sdev
, int qdepth
,
1607 if (reason
!= SCSI_QDEPTH_DEFAULT
)
1610 if (qdepth
> IBMVSCSI_MAX_CMDS_PER_LUN
)
1611 qdepth
= IBMVSCSI_MAX_CMDS_PER_LUN
;
1613 scsi_adjust_queue_depth(sdev
, 0, qdepth
);
1614 return sdev
->queue_depth
;
1617 /* ------------------------------------------------------------
1620 static ssize_t
show_host_vhost_loc(struct device
*dev
,
1621 struct device_attribute
*attr
, char *buf
)
1623 struct Scsi_Host
*shost
= class_to_shost(dev
);
1624 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1627 len
= snprintf(buf
, sizeof(hostdata
->caps
.loc
), "%s\n",
1628 hostdata
->caps
.loc
);
1632 static struct device_attribute ibmvscsi_host_vhost_loc
= {
1634 .name
= "vhost_loc",
1637 .show
= show_host_vhost_loc
,
1640 static ssize_t
show_host_vhost_name(struct device
*dev
,
1641 struct device_attribute
*attr
, char *buf
)
1643 struct Scsi_Host
*shost
= class_to_shost(dev
);
1644 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1647 len
= snprintf(buf
, sizeof(hostdata
->caps
.name
), "%s\n",
1648 hostdata
->caps
.name
);
1652 static struct device_attribute ibmvscsi_host_vhost_name
= {
1654 .name
= "vhost_name",
1657 .show
= show_host_vhost_name
,
1660 static ssize_t
show_host_srp_version(struct device
*dev
,
1661 struct device_attribute
*attr
, char *buf
)
1663 struct Scsi_Host
*shost
= class_to_shost(dev
);
1664 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1667 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1668 hostdata
->madapter_info
.srp_version
);
1672 static struct device_attribute ibmvscsi_host_srp_version
= {
1674 .name
= "srp_version",
1677 .show
= show_host_srp_version
,
1680 static ssize_t
show_host_partition_name(struct device
*dev
,
1681 struct device_attribute
*attr
,
1684 struct Scsi_Host
*shost
= class_to_shost(dev
);
1685 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1688 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1689 hostdata
->madapter_info
.partition_name
);
1693 static struct device_attribute ibmvscsi_host_partition_name
= {
1695 .name
= "partition_name",
1698 .show
= show_host_partition_name
,
1701 static ssize_t
show_host_partition_number(struct device
*dev
,
1702 struct device_attribute
*attr
,
1705 struct Scsi_Host
*shost
= class_to_shost(dev
);
1706 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1709 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1710 hostdata
->madapter_info
.partition_number
);
1714 static struct device_attribute ibmvscsi_host_partition_number
= {
1716 .name
= "partition_number",
1719 .show
= show_host_partition_number
,
1722 static ssize_t
show_host_mad_version(struct device
*dev
,
1723 struct device_attribute
*attr
, char *buf
)
1725 struct Scsi_Host
*shost
= class_to_shost(dev
);
1726 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1729 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1730 hostdata
->madapter_info
.mad_version
);
1734 static struct device_attribute ibmvscsi_host_mad_version
= {
1736 .name
= "mad_version",
1739 .show
= show_host_mad_version
,
1742 static ssize_t
show_host_os_type(struct device
*dev
,
1743 struct device_attribute
*attr
, char *buf
)
1745 struct Scsi_Host
*shost
= class_to_shost(dev
);
1746 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1749 len
= snprintf(buf
, PAGE_SIZE
, "%d\n", hostdata
->madapter_info
.os_type
);
1753 static struct device_attribute ibmvscsi_host_os_type
= {
1758 .show
= show_host_os_type
,
1761 static ssize_t
show_host_config(struct device
*dev
,
1762 struct device_attribute
*attr
, char *buf
)
1764 struct Scsi_Host
*shost
= class_to_shost(dev
);
1765 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1767 /* returns null-terminated host config data */
1768 if (ibmvscsi_do_host_config(hostdata
, buf
, PAGE_SIZE
) == 0)
1774 static struct device_attribute ibmvscsi_host_config
= {
1779 .show
= show_host_config
,
1782 static struct device_attribute
*ibmvscsi_attrs
[] = {
1783 &ibmvscsi_host_vhost_loc
,
1784 &ibmvscsi_host_vhost_name
,
1785 &ibmvscsi_host_srp_version
,
1786 &ibmvscsi_host_partition_name
,
1787 &ibmvscsi_host_partition_number
,
1788 &ibmvscsi_host_mad_version
,
1789 &ibmvscsi_host_os_type
,
1790 &ibmvscsi_host_config
,
1794 /* ------------------------------------------------------------
1795 * SCSI driver registration
1797 static struct scsi_host_template driver_template
= {
1798 .module
= THIS_MODULE
,
1799 .name
= "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION
,
1800 .proc_name
= "ibmvscsi",
1801 .queuecommand
= ibmvscsi_queuecommand
,
1802 .eh_abort_handler
= ibmvscsi_eh_abort_handler
,
1803 .eh_device_reset_handler
= ibmvscsi_eh_device_reset_handler
,
1804 .eh_host_reset_handler
= ibmvscsi_eh_host_reset_handler
,
1805 .slave_configure
= ibmvscsi_slave_configure
,
1806 .change_queue_depth
= ibmvscsi_change_queue_depth
,
1807 .cmd_per_lun
= IBMVSCSI_CMDS_PER_LUN_DEFAULT
,
1808 .can_queue
= IBMVSCSI_MAX_REQUESTS_DEFAULT
,
1810 .sg_tablesize
= SG_ALL
,
1811 .use_clustering
= ENABLE_CLUSTERING
,
1812 .shost_attrs
= ibmvscsi_attrs
,
1816 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
1818 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1821 * Number of bytes of IO data the driver will need to perform well.
1823 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev
*vdev
)
1825 /* iu_storage data allocated in initialize_event_pool */
1826 unsigned long desired_io
= max_events
* sizeof(union viosrp_iu
);
1828 /* add io space for sg data */
1829 desired_io
+= (IBMVSCSI_MAX_SECTORS_DEFAULT
* 512 *
1830 IBMVSCSI_CMDS_PER_LUN_DEFAULT
);
1835 static void ibmvscsi_do_work(struct ibmvscsi_host_data
*hostdata
)
1838 char *action
= "reset";
1840 if (hostdata
->reset_crq
) {
1842 hostdata
->reset_crq
= 0;
1844 rc
= ibmvscsi_ops
->reset_crq_queue(&hostdata
->queue
, hostdata
);
1846 rc
= ibmvscsi_ops
->send_crq(hostdata
, 0xC001000000000000LL
, 0);
1848 rc
= vio_enable_interrupts(to_vio_dev(hostdata
->dev
));
1849 } else if (hostdata
->reenable_crq
) {
1852 rc
= ibmvscsi_ops
->reenable_crq_queue(&hostdata
->queue
, hostdata
);
1853 hostdata
->reenable_crq
= 0;
1855 rc
= ibmvscsi_ops
->send_crq(hostdata
, 0xC001000000000000LL
, 0);
1860 atomic_set(&hostdata
->request_limit
, -1);
1861 dev_err(hostdata
->dev
, "error after %s\n", action
);
1864 scsi_unblock_requests(hostdata
->host
);
1867 static int ibmvscsi_work_to_do(struct ibmvscsi_host_data
*hostdata
)
1869 if (kthread_should_stop())
1871 else if (hostdata
->reset_crq
) {
1874 } else if (hostdata
->reenable_crq
) {
1882 static int ibmvscsi_work(void *data
)
1884 struct ibmvscsi_host_data
*hostdata
= data
;
1887 set_user_nice(current
, -20);
1890 rc
= wait_event_interruptible(hostdata
->work_wait_q
,
1891 ibmvscsi_work_to_do(hostdata
));
1895 if (kthread_should_stop())
1898 ibmvscsi_do_work(hostdata
);
1905 * Called by bus code for each adapter
1907 static int ibmvscsi_probe(struct vio_dev
*vdev
, const struct vio_device_id
*id
)
1909 struct ibmvscsi_host_data
*hostdata
;
1910 struct Scsi_Host
*host
;
1911 struct device
*dev
= &vdev
->dev
;
1912 struct srp_rport_identifiers ids
;
1913 struct srp_rport
*rport
;
1914 unsigned long wait_switch
= 0;
1917 dev_set_drvdata(&vdev
->dev
, NULL
);
1919 host
= scsi_host_alloc(&driver_template
, sizeof(*hostdata
));
1921 dev_err(&vdev
->dev
, "couldn't allocate host data\n");
1922 goto scsi_host_alloc_failed
;
1925 host
->transportt
= ibmvscsi_transport_template
;
1926 hostdata
= shost_priv(host
);
1927 memset(hostdata
, 0x00, sizeof(*hostdata
));
1928 INIT_LIST_HEAD(&hostdata
->sent
);
1929 init_waitqueue_head(&hostdata
->work_wait_q
);
1930 hostdata
->host
= host
;
1931 hostdata
->dev
= dev
;
1932 atomic_set(&hostdata
->request_limit
, -1);
1933 hostdata
->host
->max_sectors
= IBMVSCSI_MAX_SECTORS_DEFAULT
;
1935 if (map_persist_bufs(hostdata
)) {
1936 dev_err(&vdev
->dev
, "couldn't map persistent buffers\n");
1937 goto persist_bufs_failed
;
1940 hostdata
->work_thread
= kthread_run(ibmvscsi_work
, hostdata
, "%s_%d",
1941 "ibmvscsi", host
->host_no
);
1943 if (IS_ERR(hostdata
->work_thread
)) {
1944 dev_err(&vdev
->dev
, "couldn't initialize kthread. rc=%ld\n",
1945 PTR_ERR(hostdata
->work_thread
));
1946 goto init_crq_failed
;
1949 rc
= ibmvscsi_ops
->init_crq_queue(&hostdata
->queue
, hostdata
, max_events
);
1950 if (rc
!= 0 && rc
!= H_RESOURCE
) {
1951 dev_err(&vdev
->dev
, "couldn't initialize crq. rc=%d\n", rc
);
1954 if (initialize_event_pool(&hostdata
->pool
, max_events
, hostdata
) != 0) {
1955 dev_err(&vdev
->dev
, "couldn't initialize event pool\n");
1956 goto init_pool_failed
;
1960 host
->max_id
= max_id
;
1961 host
->max_channel
= max_channel
;
1962 host
->max_cmd_len
= 16;
1964 if (scsi_add_host(hostdata
->host
, hostdata
->dev
))
1965 goto add_host_failed
;
1967 /* we don't have a proper target_port_id so let's use the fake one */
1968 memcpy(ids
.port_id
, hostdata
->madapter_info
.partition_name
,
1969 sizeof(ids
.port_id
));
1970 ids
.roles
= SRP_RPORT_ROLE_TARGET
;
1971 rport
= srp_rport_add(host
, &ids
);
1973 goto add_srp_port_failed
;
1975 /* Try to send an initialization message. Note that this is allowed
1976 * to fail if the other end is not acive. In that case we don't
1979 if (ibmvscsi_ops
->send_crq(hostdata
, 0xC001000000000000LL
, 0) == 0
1980 || rc
== H_RESOURCE
) {
1982 * Wait around max init_timeout secs for the adapter to finish
1983 * initializing. When we are done initializing, we will have a
1984 * valid request_limit. We don't want Linux scanning before
1987 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1988 time_before(jiffies
, wait_switch
) &&
1989 atomic_read(&hostdata
->request_limit
) < 2;) {
1994 /* if we now have a valid request_limit, initiate a scan */
1995 if (atomic_read(&hostdata
->request_limit
) > 0)
1996 scsi_scan_host(host
);
1999 dev_set_drvdata(&vdev
->dev
, hostdata
);
2002 add_srp_port_failed
:
2003 scsi_remove_host(hostdata
->host
);
2005 release_event_pool(&hostdata
->pool
, hostdata
);
2007 ibmvscsi_ops
->release_crq_queue(&hostdata
->queue
, hostdata
, max_events
);
2009 kthread_stop(hostdata
->work_thread
);
2011 unmap_persist_bufs(hostdata
);
2012 persist_bufs_failed
:
2013 scsi_host_put(host
);
2014 scsi_host_alloc_failed
:
2018 static int ibmvscsi_remove(struct vio_dev
*vdev
)
2020 struct ibmvscsi_host_data
*hostdata
= dev_get_drvdata(&vdev
->dev
);
2021 unmap_persist_bufs(hostdata
);
2022 release_event_pool(&hostdata
->pool
, hostdata
);
2023 ibmvscsi_ops
->release_crq_queue(&hostdata
->queue
, hostdata
,
2026 kthread_stop(hostdata
->work_thread
);
2027 srp_remove_host(hostdata
->host
);
2028 scsi_remove_host(hostdata
->host
);
2029 scsi_host_put(hostdata
->host
);
2035 * ibmvscsi_resume: Resume from suspend
2036 * @dev: device struct
2038 * We may have lost an interrupt across suspend/resume, so kick the
2041 static int ibmvscsi_resume(struct device
*dev
)
2043 struct ibmvscsi_host_data
*hostdata
= dev_get_drvdata(dev
);
2044 return ibmvscsi_ops
->resume(hostdata
);
2048 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
2051 static struct vio_device_id ibmvscsi_device_table
[] __devinitdata
= {
2052 {"vscsi", "IBM,v-scsi"},
2055 MODULE_DEVICE_TABLE(vio
, ibmvscsi_device_table
);
2057 static struct dev_pm_ops ibmvscsi_pm_ops
= {
2058 .resume
= ibmvscsi_resume
2061 static struct vio_driver ibmvscsi_driver
= {
2062 .id_table
= ibmvscsi_device_table
,
2063 .probe
= ibmvscsi_probe
,
2064 .remove
= ibmvscsi_remove
,
2065 .get_desired_dma
= ibmvscsi_get_desired_dma
,
2068 .owner
= THIS_MODULE
,
2069 .pm
= &ibmvscsi_pm_ops
,
2073 static struct srp_function_template ibmvscsi_transport_functions
= {
2076 int __init
ibmvscsi_module_init(void)
2080 /* Ensure we have two requests to do error recovery */
2081 driver_template
.can_queue
= max_requests
;
2082 max_events
= max_requests
+ 2;
2084 if (firmware_has_feature(FW_FEATURE_ISERIES
))
2085 ibmvscsi_ops
= &iseriesvscsi_ops
;
2086 else if (firmware_has_feature(FW_FEATURE_VIO
))
2087 ibmvscsi_ops
= &rpavscsi_ops
;
2091 ibmvscsi_transport_template
=
2092 srp_attach_transport(&ibmvscsi_transport_functions
);
2093 if (!ibmvscsi_transport_template
)
2096 ret
= vio_register_driver(&ibmvscsi_driver
);
2098 srp_release_transport(ibmvscsi_transport_template
);
2102 void __exit
ibmvscsi_module_exit(void)
2104 vio_unregister_driver(&ibmvscsi_driver
);
2105 srp_release_transport(ibmvscsi_transport_template
);
2108 module_init(ibmvscsi_module_init
);
2109 module_exit(ibmvscsi_module_exit
);