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
;
327 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
328 * @cmd: srp_cmd whose additional_data member will be unmapped
329 * @dev: device for which the memory is mapped
332 static void unmap_cmd_data(struct srp_cmd
*cmd
,
333 struct srp_event_struct
*evt_struct
,
338 out_fmt
= cmd
->buf_fmt
>> 4;
339 in_fmt
= cmd
->buf_fmt
& ((1U << 4) - 1);
341 if (out_fmt
== SRP_NO_DATA_DESC
&& in_fmt
== SRP_NO_DATA_DESC
)
344 if (evt_struct
->cmnd
)
345 scsi_dma_unmap(evt_struct
->cmnd
);
348 static int map_sg_list(struct scsi_cmnd
*cmd
, int nseg
,
349 struct srp_direct_buf
*md
)
352 struct scatterlist
*sg
;
353 u64 total_length
= 0;
355 scsi_for_each_sg(cmd
, sg
, nseg
, i
) {
356 struct srp_direct_buf
*descr
= md
+ i
;
357 descr
->va
= sg_dma_address(sg
);
358 descr
->len
= sg_dma_len(sg
);
360 total_length
+= sg_dma_len(sg
);
366 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
367 * @cmd: Scsi_Cmnd with the scatterlist
368 * @srp_cmd: srp_cmd that contains the memory descriptor
369 * @dev: device for which to map dma memory
371 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
372 * Returns 1 on success.
374 static int map_sg_data(struct scsi_cmnd
*cmd
,
375 struct srp_event_struct
*evt_struct
,
376 struct srp_cmd
*srp_cmd
, struct device
*dev
)
380 u64 total_length
= 0;
381 struct srp_direct_buf
*data
=
382 (struct srp_direct_buf
*) srp_cmd
->add_data
;
383 struct srp_indirect_buf
*indirect
=
384 (struct srp_indirect_buf
*) data
;
386 sg_mapped
= scsi_dma_map(cmd
);
389 else if (sg_mapped
< 0)
392 set_srp_direction(cmd
, srp_cmd
, sg_mapped
);
394 /* special case; we can use a single direct descriptor */
395 if (sg_mapped
== 1) {
396 map_sg_list(cmd
, sg_mapped
, data
);
400 indirect
->table_desc
.va
= 0;
401 indirect
->table_desc
.len
= sg_mapped
* sizeof(struct srp_direct_buf
);
402 indirect
->table_desc
.key
= 0;
404 if (sg_mapped
<= MAX_INDIRECT_BUFS
) {
405 total_length
= map_sg_list(cmd
, sg_mapped
,
406 &indirect
->desc_list
[0]);
407 indirect
->len
= total_length
;
411 /* get indirect table */
412 if (!evt_struct
->ext_list
) {
413 evt_struct
->ext_list
= (struct srp_direct_buf
*)
414 dma_alloc_coherent(dev
,
415 SG_ALL
* sizeof(struct srp_direct_buf
),
416 &evt_struct
->ext_list_token
, 0);
417 if (!evt_struct
->ext_list
) {
418 if (!firmware_has_feature(FW_FEATURE_CMO
))
419 sdev_printk(KERN_ERR
, cmd
->device
,
420 "Can't allocate memory "
421 "for indirect table\n");
427 total_length
= map_sg_list(cmd
, sg_mapped
, evt_struct
->ext_list
);
429 indirect
->len
= total_length
;
430 indirect
->table_desc
.va
= evt_struct
->ext_list_token
;
431 indirect
->table_desc
.len
= sg_mapped
* sizeof(indirect
->desc_list
[0]);
432 memcpy(indirect
->desc_list
, evt_struct
->ext_list
,
433 MAX_INDIRECT_BUFS
* sizeof(struct srp_direct_buf
));
438 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
439 * @cmd: struct scsi_cmnd with the memory to be mapped
440 * @srp_cmd: srp_cmd that contains the memory descriptor
441 * @dev: dma device for which to map dma memory
443 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
444 * Returns 1 on success.
446 static int map_data_for_srp_cmd(struct scsi_cmnd
*cmd
,
447 struct srp_event_struct
*evt_struct
,
448 struct srp_cmd
*srp_cmd
, struct device
*dev
)
450 switch (cmd
->sc_data_direction
) {
451 case DMA_FROM_DEVICE
:
456 case DMA_BIDIRECTIONAL
:
457 sdev_printk(KERN_ERR
, cmd
->device
,
458 "Can't map DMA_BIDIRECTIONAL to read/write\n");
461 sdev_printk(KERN_ERR
, cmd
->device
,
462 "Unknown data direction 0x%02x; can't map!\n",
463 cmd
->sc_data_direction
);
467 return map_sg_data(cmd
, evt_struct
, srp_cmd
, dev
);
471 * purge_requests: Our virtual adapter just shut down. purge any sent requests
472 * @hostdata: the adapter
474 static void purge_requests(struct ibmvscsi_host_data
*hostdata
, int error_code
)
476 struct srp_event_struct
*tmp_evt
, *pos
;
479 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
480 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
481 list_del(&tmp_evt
->list
);
482 del_timer(&tmp_evt
->timer
);
484 tmp_evt
->cmnd
->result
= (error_code
<< 16);
485 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
,
487 tmp_evt
->hostdata
->dev
);
488 if (tmp_evt
->cmnd_done
)
489 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
490 } else if (tmp_evt
->done
)
491 tmp_evt
->done(tmp_evt
);
492 free_event_struct(&tmp_evt
->hostdata
->pool
, tmp_evt
);
494 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
498 * ibmvscsi_reset_host - Reset the connection to the server
499 * @hostdata: struct ibmvscsi_host_data to reset
501 static void ibmvscsi_reset_host(struct ibmvscsi_host_data
*hostdata
)
503 scsi_block_requests(hostdata
->host
);
504 atomic_set(&hostdata
->request_limit
, 0);
506 purge_requests(hostdata
, DID_ERROR
);
507 if ((ibmvscsi_ops
->reset_crq_queue(&hostdata
->queue
, hostdata
)) ||
508 (ibmvscsi_ops
->send_crq(hostdata
, 0xC001000000000000LL
, 0)) ||
509 (vio_enable_interrupts(to_vio_dev(hostdata
->dev
)))) {
510 atomic_set(&hostdata
->request_limit
, -1);
511 dev_err(hostdata
->dev
, "error after reset\n");
514 scsi_unblock_requests(hostdata
->host
);
518 * ibmvscsi_timeout - Internal command timeout handler
519 * @evt_struct: struct srp_event_struct that timed out
521 * Called when an internally generated command times out
523 static void ibmvscsi_timeout(struct srp_event_struct
*evt_struct
)
525 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
527 dev_err(hostdata
->dev
, "Command timed out (%x). Resetting connection\n",
528 evt_struct
->iu
.srp
.cmd
.opcode
);
530 ibmvscsi_reset_host(hostdata
);
534 /* ------------------------------------------------------------
535 * Routines for sending and receiving SRPs
538 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
539 * @evt_struct: evt_struct to be sent
540 * @hostdata: ibmvscsi_host_data of host
541 * @timeout: timeout in seconds - 0 means do not time command
543 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
544 * Note that this routine assumes that host_lock is held for synchronization
546 static int ibmvscsi_send_srp_event(struct srp_event_struct
*evt_struct
,
547 struct ibmvscsi_host_data
*hostdata
,
548 unsigned long timeout
)
550 u64
*crq_as_u64
= (u64
*) &evt_struct
->crq
;
551 int request_status
= 0;
554 /* If we have exhausted our request limit, just fail this request,
555 * unless it is for a reset or abort.
556 * Note that there are rare cases involving driver generated requests
557 * (such as task management requests) that the mid layer may think we
558 * can handle more requests (can_queue) when we actually can't
560 if (evt_struct
->crq
.format
== VIOSRP_SRP_FORMAT
) {
562 atomic_dec_if_positive(&hostdata
->request_limit
);
563 /* If request limit was -1 when we started, it is now even
566 if (request_status
< -1)
568 /* Otherwise, we may have run out of requests. */
569 /* If request limit was 0 when we started the adapter is in the
570 * process of performing a login with the server adapter, or
571 * we may have run out of requests.
573 else if (request_status
== -1 &&
574 evt_struct
->iu
.srp
.login_req
.opcode
!= SRP_LOGIN_REQ
)
576 /* Abort and reset calls should make it through.
577 * Nothing except abort and reset should use the last two
578 * slots unless we had two or less to begin with.
580 else if (request_status
< 2 &&
581 evt_struct
->iu
.srp
.cmd
.opcode
!= SRP_TSK_MGMT
) {
582 /* In the case that we have less than two requests
583 * available, check the server limit as a combination
584 * of the request limit and the number of requests
585 * in-flight (the size of the send list). If the
586 * server limit is greater than 2, return busy so
587 * that the last two are reserved for reset and abort.
589 int server_limit
= request_status
;
590 struct srp_event_struct
*tmp_evt
;
592 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
596 if (server_limit
> 2)
601 /* Copy the IU into the transfer area */
602 *evt_struct
->xfer_iu
= evt_struct
->iu
;
603 evt_struct
->xfer_iu
->srp
.rsp
.tag
= (u64
)evt_struct
;
605 /* Add this to the sent list. We need to do this
606 * before we actually send
607 * in case it comes back REALLY fast
609 list_add_tail(&evt_struct
->list
, &hostdata
->sent
);
611 init_timer(&evt_struct
->timer
);
613 evt_struct
->timer
.data
= (unsigned long) evt_struct
;
614 evt_struct
->timer
.expires
= jiffies
+ (timeout
* HZ
);
615 evt_struct
->timer
.function
= (void (*)(unsigned long))ibmvscsi_timeout
;
616 add_timer(&evt_struct
->timer
);
620 ibmvscsi_ops
->send_crq(hostdata
, crq_as_u64
[0], crq_as_u64
[1])) != 0) {
621 list_del(&evt_struct
->list
);
622 del_timer(&evt_struct
->timer
);
624 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
625 * Firmware will send a CRQ with a transport event (0xFF) to
626 * tell this client what has happened to the transport. This
627 * will be handled in ibmvscsi_handle_crq()
629 if (rc
== H_CLOSED
) {
630 dev_warn(hostdata
->dev
, "send warning. "
631 "Receive queue closed, will retry.\n");
634 dev_err(hostdata
->dev
, "send error %d\n", rc
);
635 atomic_inc(&hostdata
->request_limit
);
642 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
644 free_event_struct(&hostdata
->pool
, evt_struct
);
645 if (request_status
!= -1)
646 atomic_inc(&hostdata
->request_limit
);
647 return SCSI_MLQUEUE_HOST_BUSY
;
650 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
652 if (evt_struct
->cmnd
!= NULL
) {
653 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
654 evt_struct
->cmnd_done(evt_struct
->cmnd
);
655 } else if (evt_struct
->done
)
656 evt_struct
->done(evt_struct
);
658 free_event_struct(&hostdata
->pool
, evt_struct
);
663 * handle_cmd_rsp: - Handle responses from commands
664 * @evt_struct: srp_event_struct to be handled
666 * Used as a callback by when sending scsi cmds.
667 * Gets called by ibmvscsi_handle_crq()
669 static void handle_cmd_rsp(struct srp_event_struct
*evt_struct
)
671 struct srp_rsp
*rsp
= &evt_struct
->xfer_iu
->srp
.rsp
;
672 struct scsi_cmnd
*cmnd
= evt_struct
->cmnd
;
674 if (unlikely(rsp
->opcode
!= SRP_RSP
)) {
675 if (printk_ratelimit())
676 dev_warn(evt_struct
->hostdata
->dev
,
677 "bad SRP RSP type %d\n", rsp
->opcode
);
681 cmnd
->result
|= rsp
->status
;
682 if (((cmnd
->result
>> 1) & 0x1f) == CHECK_CONDITION
)
683 memcpy(cmnd
->sense_buffer
,
685 rsp
->sense_data_len
);
686 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
,
688 evt_struct
->hostdata
->dev
);
690 if (rsp
->flags
& SRP_RSP_FLAG_DOOVER
)
691 scsi_set_resid(cmnd
, rsp
->data_out_res_cnt
);
692 else if (rsp
->flags
& SRP_RSP_FLAG_DIOVER
)
693 scsi_set_resid(cmnd
, rsp
->data_in_res_cnt
);
696 if (evt_struct
->cmnd_done
)
697 evt_struct
->cmnd_done(cmnd
);
701 * lun_from_dev: - Returns the lun of the scsi device
702 * @dev: struct scsi_device
705 static inline u16
lun_from_dev(struct scsi_device
*dev
)
707 return (0x2 << 14) | (dev
->id
<< 8) | (dev
->channel
<< 5) | dev
->lun
;
711 * ibmvscsi_queue: - The queuecommand function of the scsi template
712 * @cmd: struct scsi_cmnd to be executed
713 * @done: Callback function to be called when cmd is completed
715 static int ibmvscsi_queuecommand(struct scsi_cmnd
*cmnd
,
716 void (*done
) (struct scsi_cmnd
*))
718 struct srp_cmd
*srp_cmd
;
719 struct srp_event_struct
*evt_struct
;
720 struct srp_indirect_buf
*indirect
;
721 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmnd
->device
->host
);
722 u16 lun
= lun_from_dev(cmnd
->device
);
725 cmnd
->result
= (DID_OK
<< 16);
726 evt_struct
= get_event_struct(&hostdata
->pool
);
728 return SCSI_MLQUEUE_HOST_BUSY
;
730 /* Set up the actual SRP IU */
731 srp_cmd
= &evt_struct
->iu
.srp
.cmd
;
732 memset(srp_cmd
, 0x00, SRP_MAX_IU_LEN
);
733 srp_cmd
->opcode
= SRP_CMD
;
734 memcpy(srp_cmd
->cdb
, cmnd
->cmnd
, sizeof(srp_cmd
->cdb
));
735 srp_cmd
->lun
= ((u64
) lun
) << 48;
737 if (!map_data_for_srp_cmd(cmnd
, evt_struct
, srp_cmd
, hostdata
->dev
)) {
738 if (!firmware_has_feature(FW_FEATURE_CMO
))
739 sdev_printk(KERN_ERR
, cmnd
->device
,
740 "couldn't convert cmd to srp_cmd\n");
741 free_event_struct(&hostdata
->pool
, evt_struct
);
742 return SCSI_MLQUEUE_HOST_BUSY
;
745 init_event_struct(evt_struct
,
748 cmnd
->request
->timeout
/HZ
);
750 evt_struct
->cmnd
= cmnd
;
751 evt_struct
->cmnd_done
= done
;
753 /* Fix up dma address of the buffer itself */
754 indirect
= (struct srp_indirect_buf
*) srp_cmd
->add_data
;
755 out_fmt
= srp_cmd
->buf_fmt
>> 4;
756 in_fmt
= srp_cmd
->buf_fmt
& ((1U << 4) - 1);
757 if ((in_fmt
== SRP_DATA_DESC_INDIRECT
||
758 out_fmt
== SRP_DATA_DESC_INDIRECT
) &&
759 indirect
->table_desc
.va
== 0) {
760 indirect
->table_desc
.va
= evt_struct
->crq
.IU_data_ptr
+
761 offsetof(struct srp_cmd
, add_data
) +
762 offsetof(struct srp_indirect_buf
, desc_list
);
765 return ibmvscsi_send_srp_event(evt_struct
, hostdata
, 0);
768 /* ------------------------------------------------------------
769 * Routines for driver initialization
773 * map_persist_bufs: - Pre-map persistent data for adapter logins
774 * @hostdata: ibmvscsi_host_data of host
776 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
777 * Return 1 on error, 0 on success.
779 static int map_persist_bufs(struct ibmvscsi_host_data
*hostdata
)
782 hostdata
->caps_addr
= dma_map_single(hostdata
->dev
, &hostdata
->caps
,
783 sizeof(hostdata
->caps
), DMA_BIDIRECTIONAL
);
785 if (dma_mapping_error(hostdata
->dev
, hostdata
->caps_addr
)) {
786 dev_err(hostdata
->dev
, "Unable to map capabilities buffer!\n");
790 hostdata
->adapter_info_addr
= dma_map_single(hostdata
->dev
,
791 &hostdata
->madapter_info
,
792 sizeof(hostdata
->madapter_info
),
794 if (dma_mapping_error(hostdata
->dev
, hostdata
->adapter_info_addr
)) {
795 dev_err(hostdata
->dev
, "Unable to map adapter info buffer!\n");
796 dma_unmap_single(hostdata
->dev
, hostdata
->caps_addr
,
797 sizeof(hostdata
->caps
), DMA_BIDIRECTIONAL
);
805 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
806 * @hostdata: ibmvscsi_host_data of host
808 * Unmap the capabilities and adapter info DMA buffers
810 static void unmap_persist_bufs(struct ibmvscsi_host_data
*hostdata
)
812 dma_unmap_single(hostdata
->dev
, hostdata
->caps_addr
,
813 sizeof(hostdata
->caps
), DMA_BIDIRECTIONAL
);
815 dma_unmap_single(hostdata
->dev
, hostdata
->adapter_info_addr
,
816 sizeof(hostdata
->madapter_info
), DMA_BIDIRECTIONAL
);
820 * login_rsp: - Handle response to SRP login request
821 * @evt_struct: srp_event_struct with the response
823 * Used as a "done" callback by when sending srp_login. Gets called
824 * by ibmvscsi_handle_crq()
826 static void login_rsp(struct srp_event_struct
*evt_struct
)
828 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
829 switch (evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
) {
830 case SRP_LOGIN_RSP
: /* it worked! */
832 case SRP_LOGIN_REJ
: /* refused! */
833 dev_info(hostdata
->dev
, "SRP_LOGIN_REJ reason %u\n",
834 evt_struct
->xfer_iu
->srp
.login_rej
.reason
);
836 atomic_set(&hostdata
->request_limit
, -1);
839 dev_err(hostdata
->dev
, "Invalid login response typecode 0x%02x!\n",
840 evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
);
842 atomic_set(&hostdata
->request_limit
, -1);
846 dev_info(hostdata
->dev
, "SRP_LOGIN succeeded\n");
847 hostdata
->client_migrated
= 0;
849 /* Now we know what the real request-limit is.
850 * This value is set rather than added to request_limit because
851 * request_limit could have been set to -1 by this client.
853 atomic_set(&hostdata
->request_limit
,
854 evt_struct
->xfer_iu
->srp
.login_rsp
.req_lim_delta
);
856 /* If we had any pending I/Os, kick them */
857 scsi_unblock_requests(hostdata
->host
);
861 * send_srp_login: - Sends the srp login
862 * @hostdata: ibmvscsi_host_data of host
864 * Returns zero if successful.
866 static int send_srp_login(struct ibmvscsi_host_data
*hostdata
)
870 struct srp_login_req
*login
;
871 struct srp_event_struct
*evt_struct
= get_event_struct(&hostdata
->pool
);
874 init_event_struct(evt_struct
, login_rsp
,
875 VIOSRP_SRP_FORMAT
, login_timeout
);
877 login
= &evt_struct
->iu
.srp
.login_req
;
878 memset(login
, 0, sizeof(*login
));
879 login
->opcode
= SRP_LOGIN_REQ
;
880 login
->req_it_iu_len
= sizeof(union srp_iu
);
881 login
->req_buf_fmt
= SRP_BUF_FORMAT_DIRECT
| SRP_BUF_FORMAT_INDIRECT
;
883 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
884 /* Start out with a request limit of 0, since this is negotiated in
885 * the login request we are just sending and login requests always
886 * get sent by the driver regardless of request_limit.
888 atomic_set(&hostdata
->request_limit
, 0);
890 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, login_timeout
* 2);
891 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
892 dev_info(hostdata
->dev
, "sent SRP login\n");
897 * capabilities_rsp: - Handle response to MAD adapter capabilities request
898 * @evt_struct: srp_event_struct with the response
900 * Used as a "done" callback by when sending adapter_info.
902 static void capabilities_rsp(struct srp_event_struct
*evt_struct
)
904 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
906 if (evt_struct
->xfer_iu
->mad
.capabilities
.common
.status
) {
907 dev_err(hostdata
->dev
, "error 0x%X getting capabilities info\n",
908 evt_struct
->xfer_iu
->mad
.capabilities
.common
.status
);
910 if (hostdata
->caps
.migration
.common
.server_support
!= SERVER_SUPPORTS_CAP
)
911 dev_info(hostdata
->dev
, "Partition migration not supported\n");
913 if (client_reserve
) {
914 if (hostdata
->caps
.reserve
.common
.server_support
==
916 dev_info(hostdata
->dev
, "Client reserve enabled\n");
918 dev_info(hostdata
->dev
, "Client reserve not supported\n");
922 send_srp_login(hostdata
);
926 * send_mad_capabilities: - Sends the mad capabilities request
927 * and stores the result so it can be retrieved with
928 * @hostdata: ibmvscsi_host_data of host
930 static void send_mad_capabilities(struct ibmvscsi_host_data
*hostdata
)
932 struct viosrp_capabilities
*req
;
933 struct srp_event_struct
*evt_struct
;
935 struct device_node
*of_node
= hostdata
->dev
->of_node
;
936 const char *location
;
938 evt_struct
= get_event_struct(&hostdata
->pool
);
941 init_event_struct(evt_struct
, capabilities_rsp
,
942 VIOSRP_MAD_FORMAT
, info_timeout
);
944 req
= &evt_struct
->iu
.mad
.capabilities
;
945 memset(req
, 0, sizeof(*req
));
947 hostdata
->caps
.flags
= CAP_LIST_SUPPORTED
;
948 if (hostdata
->client_migrated
)
949 hostdata
->caps
.flags
|= CLIENT_MIGRATED
;
951 strncpy(hostdata
->caps
.name
, dev_name(&hostdata
->host
->shost_gendev
),
952 sizeof(hostdata
->caps
.name
));
953 hostdata
->caps
.name
[sizeof(hostdata
->caps
.name
) - 1] = '\0';
955 location
= of_get_property(of_node
, "ibm,loc-code", NULL
);
956 location
= location
? location
: dev_name(hostdata
->dev
);
957 strncpy(hostdata
->caps
.loc
, location
, sizeof(hostdata
->caps
.loc
));
958 hostdata
->caps
.loc
[sizeof(hostdata
->caps
.loc
) - 1] = '\0';
960 req
->common
.type
= VIOSRP_CAPABILITIES_TYPE
;
961 req
->buffer
= hostdata
->caps_addr
;
963 hostdata
->caps
.migration
.common
.cap_type
= MIGRATION_CAPABILITIES
;
964 hostdata
->caps
.migration
.common
.length
= sizeof(hostdata
->caps
.migration
);
965 hostdata
->caps
.migration
.common
.server_support
= SERVER_SUPPORTS_CAP
;
966 hostdata
->caps
.migration
.ecl
= 1;
968 if (client_reserve
) {
969 hostdata
->caps
.reserve
.common
.cap_type
= RESERVATION_CAPABILITIES
;
970 hostdata
->caps
.reserve
.common
.length
= sizeof(hostdata
->caps
.reserve
);
971 hostdata
->caps
.reserve
.common
.server_support
= SERVER_SUPPORTS_CAP
;
972 hostdata
->caps
.reserve
.type
= CLIENT_RESERVE_SCSI_2
;
973 req
->common
.length
= sizeof(hostdata
->caps
);
975 req
->common
.length
= sizeof(hostdata
->caps
) - sizeof(hostdata
->caps
.reserve
);
977 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
978 if (ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2))
979 dev_err(hostdata
->dev
, "couldn't send CAPABILITIES_REQ!\n");
980 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
984 * fast_fail_rsp: - Handle response to MAD enable fast fail
985 * @evt_struct: srp_event_struct with the response
987 * Used as a "done" callback by when sending enable fast fail. Gets called
988 * by ibmvscsi_handle_crq()
990 static void fast_fail_rsp(struct srp_event_struct
*evt_struct
)
992 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
993 u8 status
= evt_struct
->xfer_iu
->mad
.fast_fail
.common
.status
;
995 if (status
== VIOSRP_MAD_NOT_SUPPORTED
)
996 dev_err(hostdata
->dev
, "fast_fail not supported in server\n");
997 else if (status
== VIOSRP_MAD_FAILED
)
998 dev_err(hostdata
->dev
, "fast_fail request failed\n");
999 else if (status
!= VIOSRP_MAD_SUCCESS
)
1000 dev_err(hostdata
->dev
, "error 0x%X enabling fast_fail\n", status
);
1002 send_mad_capabilities(hostdata
);
1006 * init_host - Start host initialization
1007 * @hostdata: ibmvscsi_host_data of host
1009 * Returns zero if successful.
1011 static int enable_fast_fail(struct ibmvscsi_host_data
*hostdata
)
1014 unsigned long flags
;
1015 struct viosrp_fast_fail
*fast_fail_mad
;
1016 struct srp_event_struct
*evt_struct
;
1019 send_mad_capabilities(hostdata
);
1023 evt_struct
= get_event_struct(&hostdata
->pool
);
1024 BUG_ON(!evt_struct
);
1026 init_event_struct(evt_struct
, fast_fail_rsp
, VIOSRP_MAD_FORMAT
, info_timeout
);
1028 fast_fail_mad
= &evt_struct
->iu
.mad
.fast_fail
;
1029 memset(fast_fail_mad
, 0, sizeof(*fast_fail_mad
));
1030 fast_fail_mad
->common
.type
= VIOSRP_ENABLE_FAST_FAIL
;
1031 fast_fail_mad
->common
.length
= sizeof(*fast_fail_mad
);
1033 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1034 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2);
1035 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1040 * adapter_info_rsp: - Handle response to MAD adapter info request
1041 * @evt_struct: srp_event_struct with the response
1043 * Used as a "done" callback by when sending adapter_info. Gets called
1044 * by ibmvscsi_handle_crq()
1046 static void adapter_info_rsp(struct srp_event_struct
*evt_struct
)
1048 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
1050 if (evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
) {
1051 dev_err(hostdata
->dev
, "error %d getting adapter info\n",
1052 evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
);
1054 dev_info(hostdata
->dev
, "host srp version: %s, "
1055 "host partition %s (%d), OS %d, max io %u\n",
1056 hostdata
->madapter_info
.srp_version
,
1057 hostdata
->madapter_info
.partition_name
,
1058 hostdata
->madapter_info
.partition_number
,
1059 hostdata
->madapter_info
.os_type
,
1060 hostdata
->madapter_info
.port_max_txu
[0]);
1062 if (hostdata
->madapter_info
.port_max_txu
[0])
1063 hostdata
->host
->max_sectors
=
1064 hostdata
->madapter_info
.port_max_txu
[0] >> 9;
1066 if (hostdata
->madapter_info
.os_type
== 3 &&
1067 strcmp(hostdata
->madapter_info
.srp_version
, "1.6a") <= 0) {
1068 dev_err(hostdata
->dev
, "host (Ver. %s) doesn't support large transfers\n",
1069 hostdata
->madapter_info
.srp_version
);
1070 dev_err(hostdata
->dev
, "limiting scatterlists to %d\n",
1072 hostdata
->host
->sg_tablesize
= MAX_INDIRECT_BUFS
;
1075 if (hostdata
->madapter_info
.os_type
== 3) {
1076 enable_fast_fail(hostdata
);
1081 send_srp_login(hostdata
);
1085 * send_mad_adapter_info: - Sends the mad adapter info request
1086 * and stores the result so it can be retrieved with
1087 * sysfs. We COULD consider causing a failure if the
1088 * returned SRP version doesn't match ours.
1089 * @hostdata: ibmvscsi_host_data of host
1091 * Returns zero if successful.
1093 static void send_mad_adapter_info(struct ibmvscsi_host_data
*hostdata
)
1095 struct viosrp_adapter_info
*req
;
1096 struct srp_event_struct
*evt_struct
;
1097 unsigned long flags
;
1099 evt_struct
= get_event_struct(&hostdata
->pool
);
1100 BUG_ON(!evt_struct
);
1102 init_event_struct(evt_struct
,
1107 req
= &evt_struct
->iu
.mad
.adapter_info
;
1108 memset(req
, 0x00, sizeof(*req
));
1110 req
->common
.type
= VIOSRP_ADAPTER_INFO_TYPE
;
1111 req
->common
.length
= sizeof(hostdata
->madapter_info
);
1112 req
->buffer
= hostdata
->adapter_info_addr
;
1114 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1115 if (ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2))
1116 dev_err(hostdata
->dev
, "couldn't send ADAPTER_INFO_REQ!\n");
1117 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1121 * init_adapter: Start virtual adapter initialization sequence
1124 static void init_adapter(struct ibmvscsi_host_data
*hostdata
)
1126 send_mad_adapter_info(hostdata
);
1130 * sync_completion: Signal that a synchronous command has completed
1131 * Note that after returning from this call, the evt_struct is freed.
1132 * the caller waiting on this completion shouldn't touch the evt_struct
1135 static void sync_completion(struct srp_event_struct
*evt_struct
)
1137 /* copy the response back */
1138 if (evt_struct
->sync_srp
)
1139 *evt_struct
->sync_srp
= *evt_struct
->xfer_iu
;
1141 complete(&evt_struct
->comp
);
1145 * ibmvscsi_abort: Abort a command...from scsi host template
1146 * send this over to the server and wait synchronously for the response
1148 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd
*cmd
)
1150 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1151 struct srp_tsk_mgmt
*tsk_mgmt
;
1152 struct srp_event_struct
*evt
;
1153 struct srp_event_struct
*tmp_evt
, *found_evt
;
1154 union viosrp_iu srp_rsp
;
1156 unsigned long flags
;
1157 u16 lun
= lun_from_dev(cmd
->device
);
1158 unsigned long wait_switch
= 0;
1160 /* First, find this command in our sent list so we can figure
1161 * out the correct tag
1163 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1164 wait_switch
= jiffies
+ (init_timeout
* HZ
);
1167 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1168 if (tmp_evt
->cmnd
== cmd
) {
1169 found_evt
= tmp_evt
;
1175 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1179 evt
= get_event_struct(&hostdata
->pool
);
1181 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1182 sdev_printk(KERN_ERR
, cmd
->device
,
1183 "failed to allocate abort event\n");
1187 init_event_struct(evt
,
1192 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1194 /* Set up an abort SRP command */
1195 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1196 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1197 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1198 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_ABORT_TASK
;
1199 tsk_mgmt
->task_tag
= (u64
) found_evt
;
1201 evt
->sync_srp
= &srp_rsp
;
1203 init_completion(&evt
->comp
);
1204 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, abort_timeout
* 2);
1206 if (rsp_rc
!= SCSI_MLQUEUE_HOST_BUSY
)
1209 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1211 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1212 } while (time_before(jiffies
, wait_switch
));
1214 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1217 sdev_printk(KERN_ERR
, cmd
->device
,
1218 "failed to send abort() event. rc=%d\n", rsp_rc
);
1222 sdev_printk(KERN_INFO
, cmd
->device
,
1223 "aborting command. lun 0x%llx, tag 0x%llx\n",
1224 (((u64
) lun
) << 48), (u64
) found_evt
);
1226 wait_for_completion(&evt
->comp
);
1228 /* make sure we got a good response */
1229 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1230 if (printk_ratelimit())
1231 sdev_printk(KERN_WARNING
, cmd
->device
, "abort bad SRP RSP type %d\n",
1232 srp_rsp
.srp
.rsp
.opcode
);
1236 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1237 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1239 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1242 if (printk_ratelimit())
1243 sdev_printk(KERN_WARNING
, cmd
->device
,
1244 "abort code %d for task tag 0x%llx\n",
1245 rsp_rc
, tsk_mgmt
->task_tag
);
1249 /* Because we dropped the spinlock above, it's possible
1250 * The event is no longer in our list. Make sure it didn't
1251 * complete while we were aborting
1253 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1255 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1256 if (tmp_evt
->cmnd
== cmd
) {
1257 found_evt
= tmp_evt
;
1262 if (found_evt
== NULL
) {
1263 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1264 sdev_printk(KERN_INFO
, cmd
->device
, "aborted task tag 0x%llx completed\n",
1265 tsk_mgmt
->task_tag
);
1269 sdev_printk(KERN_INFO
, cmd
->device
, "successfully aborted task tag 0x%llx\n",
1270 tsk_mgmt
->task_tag
);
1272 cmd
->result
= (DID_ABORT
<< 16);
1273 list_del(&found_evt
->list
);
1274 unmap_cmd_data(&found_evt
->iu
.srp
.cmd
, found_evt
,
1275 found_evt
->hostdata
->dev
);
1276 free_event_struct(&found_evt
->hostdata
->pool
, found_evt
);
1277 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1278 atomic_inc(&hostdata
->request_limit
);
1283 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1284 * template send this over to the server and wait synchronously for the
1287 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd
*cmd
)
1289 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1290 struct srp_tsk_mgmt
*tsk_mgmt
;
1291 struct srp_event_struct
*evt
;
1292 struct srp_event_struct
*tmp_evt
, *pos
;
1293 union viosrp_iu srp_rsp
;
1295 unsigned long flags
;
1296 u16 lun
= lun_from_dev(cmd
->device
);
1297 unsigned long wait_switch
= 0;
1299 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1300 wait_switch
= jiffies
+ (init_timeout
* HZ
);
1302 evt
= get_event_struct(&hostdata
->pool
);
1304 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1305 sdev_printk(KERN_ERR
, cmd
->device
,
1306 "failed to allocate reset event\n");
1310 init_event_struct(evt
,
1315 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1317 /* Set up a lun reset SRP command */
1318 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1319 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1320 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1321 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_LUN_RESET
;
1323 evt
->sync_srp
= &srp_rsp
;
1325 init_completion(&evt
->comp
);
1326 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, reset_timeout
* 2);
1328 if (rsp_rc
!= SCSI_MLQUEUE_HOST_BUSY
)
1331 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1333 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1334 } while (time_before(jiffies
, wait_switch
));
1336 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1339 sdev_printk(KERN_ERR
, cmd
->device
,
1340 "failed to send reset event. rc=%d\n", rsp_rc
);
1344 sdev_printk(KERN_INFO
, cmd
->device
, "resetting device. lun 0x%llx\n",
1345 (((u64
) lun
) << 48));
1347 wait_for_completion(&evt
->comp
);
1349 /* make sure we got a good response */
1350 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1351 if (printk_ratelimit())
1352 sdev_printk(KERN_WARNING
, cmd
->device
, "reset bad SRP RSP type %d\n",
1353 srp_rsp
.srp
.rsp
.opcode
);
1357 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1358 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1360 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1363 if (printk_ratelimit())
1364 sdev_printk(KERN_WARNING
, cmd
->device
,
1365 "reset code %d for task tag 0x%llx\n",
1366 rsp_rc
, tsk_mgmt
->task_tag
);
1370 /* We need to find all commands for this LUN that have not yet been
1371 * responded to, and fail them with DID_RESET
1373 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1374 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
1375 if ((tmp_evt
->cmnd
) && (tmp_evt
->cmnd
->device
== cmd
->device
)) {
1377 tmp_evt
->cmnd
->result
= (DID_RESET
<< 16);
1378 list_del(&tmp_evt
->list
);
1379 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
, tmp_evt
,
1380 tmp_evt
->hostdata
->dev
);
1381 free_event_struct(&tmp_evt
->hostdata
->pool
,
1383 atomic_inc(&hostdata
->request_limit
);
1384 if (tmp_evt
->cmnd_done
)
1385 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
1386 else if (tmp_evt
->done
)
1387 tmp_evt
->done(tmp_evt
);
1390 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1395 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1396 * @cmd: struct scsi_cmnd having problems
1398 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd
*cmd
)
1400 unsigned long wait_switch
= 0;
1401 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1403 dev_err(hostdata
->dev
, "Resetting connection due to error recovery\n");
1405 ibmvscsi_reset_host(hostdata
);
1407 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1408 time_before(jiffies
, wait_switch
) &&
1409 atomic_read(&hostdata
->request_limit
) < 2;) {
1414 if (atomic_read(&hostdata
->request_limit
) <= 0)
1421 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1422 * @crq: Command/Response queue
1423 * @hostdata: ibmvscsi_host_data of host
1426 void ibmvscsi_handle_crq(struct viosrp_crq
*crq
,
1427 struct ibmvscsi_host_data
*hostdata
)
1430 unsigned long flags
;
1431 struct srp_event_struct
*evt_struct
=
1432 (struct srp_event_struct
*)crq
->IU_data_ptr
;
1433 switch (crq
->valid
) {
1434 case 0xC0: /* initialization */
1435 switch (crq
->format
) {
1436 case 0x01: /* Initialization message */
1437 dev_info(hostdata
->dev
, "partner initialized\n");
1438 /* Send back a response */
1439 if ((rc
= ibmvscsi_ops
->send_crq(hostdata
,
1440 0xC002000000000000LL
, 0)) == 0) {
1442 init_adapter(hostdata
);
1444 dev_err(hostdata
->dev
, "Unable to send init rsp. rc=%ld\n", rc
);
1448 case 0x02: /* Initialization response */
1449 dev_info(hostdata
->dev
, "partner initialization complete\n");
1452 init_adapter(hostdata
);
1455 dev_err(hostdata
->dev
, "unknown crq message type: %d\n", crq
->format
);
1458 case 0xFF: /* Hypervisor telling us the connection is closed */
1459 scsi_block_requests(hostdata
->host
);
1460 atomic_set(&hostdata
->request_limit
, 0);
1461 if (crq
->format
== 0x06) {
1462 /* We need to re-setup the interpartition connection */
1463 dev_info(hostdata
->dev
, "Re-enabling adapter!\n");
1464 hostdata
->client_migrated
= 1;
1465 purge_requests(hostdata
, DID_REQUEUE
);
1466 if ((ibmvscsi_ops
->reenable_crq_queue(&hostdata
->queue
,
1468 (ibmvscsi_ops
->send_crq(hostdata
,
1469 0xC001000000000000LL
, 0))) {
1470 atomic_set(&hostdata
->request_limit
,
1472 dev_err(hostdata
->dev
, "error after enable\n");
1475 dev_err(hostdata
->dev
, "Virtual adapter failed rc %d!\n",
1478 purge_requests(hostdata
, DID_ERROR
);
1479 if ((ibmvscsi_ops
->reset_crq_queue(&hostdata
->queue
,
1481 (ibmvscsi_ops
->send_crq(hostdata
,
1482 0xC001000000000000LL
, 0))) {
1483 atomic_set(&hostdata
->request_limit
,
1485 dev_err(hostdata
->dev
, "error after reset\n");
1488 scsi_unblock_requests(hostdata
->host
);
1490 case 0x80: /* real payload */
1493 dev_err(hostdata
->dev
, "got an invalid message type 0x%02x\n",
1498 /* The only kind of payload CRQs we should get are responses to
1499 * things we send. Make sure this response is to something we
1502 if (!valid_event_struct(&hostdata
->pool
, evt_struct
)) {
1503 dev_err(hostdata
->dev
, "returned correlation_token 0x%p is invalid!\n",
1504 (void *)crq
->IU_data_ptr
);
1508 if (atomic_read(&evt_struct
->free
)) {
1509 dev_err(hostdata
->dev
, "received duplicate correlation_token 0x%p!\n",
1510 (void *)crq
->IU_data_ptr
);
1514 if (crq
->format
== VIOSRP_SRP_FORMAT
)
1515 atomic_add(evt_struct
->xfer_iu
->srp
.rsp
.req_lim_delta
,
1516 &hostdata
->request_limit
);
1518 del_timer(&evt_struct
->timer
);
1520 if ((crq
->status
!= VIOSRP_OK
&& crq
->status
!= VIOSRP_OK2
) && evt_struct
->cmnd
)
1521 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
1522 if (evt_struct
->done
)
1523 evt_struct
->done(evt_struct
);
1525 dev_err(hostdata
->dev
, "returned done() is NULL; not running it!\n");
1528 * Lock the host_lock before messing with these structures, since we
1529 * are running in a task context
1531 spin_lock_irqsave(evt_struct
->hostdata
->host
->host_lock
, flags
);
1532 list_del(&evt_struct
->list
);
1533 free_event_struct(&evt_struct
->hostdata
->pool
, evt_struct
);
1534 spin_unlock_irqrestore(evt_struct
->hostdata
->host
->host_lock
, flags
);
1538 * ibmvscsi_get_host_config: Send the command to the server to get host
1539 * configuration data. The data is opaque to us.
1541 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data
*hostdata
,
1542 unsigned char *buffer
, int length
)
1544 struct viosrp_host_config
*host_config
;
1545 struct srp_event_struct
*evt_struct
;
1546 unsigned long flags
;
1550 evt_struct
= get_event_struct(&hostdata
->pool
);
1552 dev_err(hostdata
->dev
, "couldn't allocate event for HOST_CONFIG!\n");
1556 init_event_struct(evt_struct
,
1561 host_config
= &evt_struct
->iu
.mad
.host_config
;
1563 /* Set up a lun reset SRP command */
1564 memset(host_config
, 0x00, sizeof(*host_config
));
1565 host_config
->common
.type
= VIOSRP_HOST_CONFIG_TYPE
;
1566 host_config
->common
.length
= length
;
1567 host_config
->buffer
= addr
= dma_map_single(hostdata
->dev
, buffer
,
1571 if (dma_mapping_error(hostdata
->dev
, host_config
->buffer
)) {
1572 if (!firmware_has_feature(FW_FEATURE_CMO
))
1573 dev_err(hostdata
->dev
,
1574 "dma_mapping error getting host config\n");
1575 free_event_struct(&hostdata
->pool
, evt_struct
);
1579 init_completion(&evt_struct
->comp
);
1580 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1581 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, info_timeout
* 2);
1582 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1584 wait_for_completion(&evt_struct
->comp
);
1585 dma_unmap_single(hostdata
->dev
, addr
, length
, DMA_BIDIRECTIONAL
);
1591 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1592 * @sdev: struct scsi_device device to configure
1594 * Enable allow_restart for a device if it is a disk. Adjust the
1595 * queue_depth here also as is required by the documentation for
1596 * struct scsi_host_template.
1598 static int ibmvscsi_slave_configure(struct scsi_device
*sdev
)
1600 struct Scsi_Host
*shost
= sdev
->host
;
1601 unsigned long lock_flags
= 0;
1603 spin_lock_irqsave(shost
->host_lock
, lock_flags
);
1604 if (sdev
->type
== TYPE_DISK
) {
1605 sdev
->allow_restart
= 1;
1606 blk_queue_rq_timeout(sdev
->request_queue
, 120 * HZ
);
1608 scsi_adjust_queue_depth(sdev
, 0, shost
->cmd_per_lun
);
1609 spin_unlock_irqrestore(shost
->host_lock
, lock_flags
);
1614 * ibmvscsi_change_queue_depth - Change the device's queue depth
1615 * @sdev: scsi device struct
1616 * @qdepth: depth to set
1617 * @reason: calling context
1622 static int ibmvscsi_change_queue_depth(struct scsi_device
*sdev
, int qdepth
,
1625 if (reason
!= SCSI_QDEPTH_DEFAULT
)
1628 if (qdepth
> IBMVSCSI_MAX_CMDS_PER_LUN
)
1629 qdepth
= IBMVSCSI_MAX_CMDS_PER_LUN
;
1631 scsi_adjust_queue_depth(sdev
, 0, qdepth
);
1632 return sdev
->queue_depth
;
1635 /* ------------------------------------------------------------
1638 static ssize_t
show_host_vhost_loc(struct device
*dev
,
1639 struct device_attribute
*attr
, char *buf
)
1641 struct Scsi_Host
*shost
= class_to_shost(dev
);
1642 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1645 len
= snprintf(buf
, sizeof(hostdata
->caps
.loc
), "%s\n",
1646 hostdata
->caps
.loc
);
1650 static struct device_attribute ibmvscsi_host_vhost_loc
= {
1652 .name
= "vhost_loc",
1655 .show
= show_host_vhost_loc
,
1658 static ssize_t
show_host_vhost_name(struct device
*dev
,
1659 struct device_attribute
*attr
, char *buf
)
1661 struct Scsi_Host
*shost
= class_to_shost(dev
);
1662 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1665 len
= snprintf(buf
, sizeof(hostdata
->caps
.name
), "%s\n",
1666 hostdata
->caps
.name
);
1670 static struct device_attribute ibmvscsi_host_vhost_name
= {
1672 .name
= "vhost_name",
1675 .show
= show_host_vhost_name
,
1678 static ssize_t
show_host_srp_version(struct device
*dev
,
1679 struct device_attribute
*attr
, char *buf
)
1681 struct Scsi_Host
*shost
= class_to_shost(dev
);
1682 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1685 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1686 hostdata
->madapter_info
.srp_version
);
1690 static struct device_attribute ibmvscsi_host_srp_version
= {
1692 .name
= "srp_version",
1695 .show
= show_host_srp_version
,
1698 static ssize_t
show_host_partition_name(struct device
*dev
,
1699 struct device_attribute
*attr
,
1702 struct Scsi_Host
*shost
= class_to_shost(dev
);
1703 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1706 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1707 hostdata
->madapter_info
.partition_name
);
1711 static struct device_attribute ibmvscsi_host_partition_name
= {
1713 .name
= "partition_name",
1716 .show
= show_host_partition_name
,
1719 static ssize_t
show_host_partition_number(struct device
*dev
,
1720 struct device_attribute
*attr
,
1723 struct Scsi_Host
*shost
= class_to_shost(dev
);
1724 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1727 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1728 hostdata
->madapter_info
.partition_number
);
1732 static struct device_attribute ibmvscsi_host_partition_number
= {
1734 .name
= "partition_number",
1737 .show
= show_host_partition_number
,
1740 static ssize_t
show_host_mad_version(struct device
*dev
,
1741 struct device_attribute
*attr
, char *buf
)
1743 struct Scsi_Host
*shost
= class_to_shost(dev
);
1744 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1747 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1748 hostdata
->madapter_info
.mad_version
);
1752 static struct device_attribute ibmvscsi_host_mad_version
= {
1754 .name
= "mad_version",
1757 .show
= show_host_mad_version
,
1760 static ssize_t
show_host_os_type(struct device
*dev
,
1761 struct device_attribute
*attr
, char *buf
)
1763 struct Scsi_Host
*shost
= class_to_shost(dev
);
1764 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1767 len
= snprintf(buf
, PAGE_SIZE
, "%d\n", hostdata
->madapter_info
.os_type
);
1771 static struct device_attribute ibmvscsi_host_os_type
= {
1776 .show
= show_host_os_type
,
1779 static ssize_t
show_host_config(struct device
*dev
,
1780 struct device_attribute
*attr
, char *buf
)
1782 struct Scsi_Host
*shost
= class_to_shost(dev
);
1783 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1785 /* returns null-terminated host config data */
1786 if (ibmvscsi_do_host_config(hostdata
, buf
, PAGE_SIZE
) == 0)
1792 static struct device_attribute ibmvscsi_host_config
= {
1797 .show
= show_host_config
,
1800 static struct device_attribute
*ibmvscsi_attrs
[] = {
1801 &ibmvscsi_host_vhost_loc
,
1802 &ibmvscsi_host_vhost_name
,
1803 &ibmvscsi_host_srp_version
,
1804 &ibmvscsi_host_partition_name
,
1805 &ibmvscsi_host_partition_number
,
1806 &ibmvscsi_host_mad_version
,
1807 &ibmvscsi_host_os_type
,
1808 &ibmvscsi_host_config
,
1812 /* ------------------------------------------------------------
1813 * SCSI driver registration
1815 static struct scsi_host_template driver_template
= {
1816 .module
= THIS_MODULE
,
1817 .name
= "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION
,
1818 .proc_name
= "ibmvscsi",
1819 .queuecommand
= ibmvscsi_queuecommand
,
1820 .eh_abort_handler
= ibmvscsi_eh_abort_handler
,
1821 .eh_device_reset_handler
= ibmvscsi_eh_device_reset_handler
,
1822 .eh_host_reset_handler
= ibmvscsi_eh_host_reset_handler
,
1823 .slave_configure
= ibmvscsi_slave_configure
,
1824 .change_queue_depth
= ibmvscsi_change_queue_depth
,
1825 .cmd_per_lun
= IBMVSCSI_CMDS_PER_LUN_DEFAULT
,
1826 .can_queue
= IBMVSCSI_MAX_REQUESTS_DEFAULT
,
1828 .sg_tablesize
= SG_ALL
,
1829 .use_clustering
= ENABLE_CLUSTERING
,
1830 .shost_attrs
= ibmvscsi_attrs
,
1834 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
1836 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1839 * Number of bytes of IO data the driver will need to perform well.
1841 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev
*vdev
)
1843 /* iu_storage data allocated in initialize_event_pool */
1844 unsigned long desired_io
= max_events
* sizeof(union viosrp_iu
);
1846 /* add io space for sg data */
1847 desired_io
+= (IBMVSCSI_MAX_SECTORS_DEFAULT
* 512 *
1848 IBMVSCSI_CMDS_PER_LUN_DEFAULT
);
1854 * Called by bus code for each adapter
1856 static int ibmvscsi_probe(struct vio_dev
*vdev
, const struct vio_device_id
*id
)
1858 struct ibmvscsi_host_data
*hostdata
;
1859 struct Scsi_Host
*host
;
1860 struct device
*dev
= &vdev
->dev
;
1861 struct srp_rport_identifiers ids
;
1862 struct srp_rport
*rport
;
1863 unsigned long wait_switch
= 0;
1866 dev_set_drvdata(&vdev
->dev
, NULL
);
1868 host
= scsi_host_alloc(&driver_template
, sizeof(*hostdata
));
1870 dev_err(&vdev
->dev
, "couldn't allocate host data\n");
1871 goto scsi_host_alloc_failed
;
1874 host
->transportt
= ibmvscsi_transport_template
;
1875 hostdata
= shost_priv(host
);
1876 memset(hostdata
, 0x00, sizeof(*hostdata
));
1877 INIT_LIST_HEAD(&hostdata
->sent
);
1878 hostdata
->host
= host
;
1879 hostdata
->dev
= dev
;
1880 atomic_set(&hostdata
->request_limit
, -1);
1881 hostdata
->host
->max_sectors
= IBMVSCSI_MAX_SECTORS_DEFAULT
;
1883 if (map_persist_bufs(hostdata
)) {
1884 dev_err(&vdev
->dev
, "couldn't map persistent buffers\n");
1885 goto persist_bufs_failed
;
1888 rc
= ibmvscsi_ops
->init_crq_queue(&hostdata
->queue
, hostdata
, max_events
);
1889 if (rc
!= 0 && rc
!= H_RESOURCE
) {
1890 dev_err(&vdev
->dev
, "couldn't initialize crq. rc=%d\n", rc
);
1891 goto init_crq_failed
;
1893 if (initialize_event_pool(&hostdata
->pool
, max_events
, hostdata
) != 0) {
1894 dev_err(&vdev
->dev
, "couldn't initialize event pool\n");
1895 goto init_pool_failed
;
1899 host
->max_id
= max_id
;
1900 host
->max_channel
= max_channel
;
1901 host
->max_cmd_len
= 16;
1903 if (scsi_add_host(hostdata
->host
, hostdata
->dev
))
1904 goto add_host_failed
;
1906 /* we don't have a proper target_port_id so let's use the fake one */
1907 memcpy(ids
.port_id
, hostdata
->madapter_info
.partition_name
,
1908 sizeof(ids
.port_id
));
1909 ids
.roles
= SRP_RPORT_ROLE_TARGET
;
1910 rport
= srp_rport_add(host
, &ids
);
1912 goto add_srp_port_failed
;
1914 /* Try to send an initialization message. Note that this is allowed
1915 * to fail if the other end is not acive. In that case we don't
1918 if (ibmvscsi_ops
->send_crq(hostdata
, 0xC001000000000000LL
, 0) == 0
1919 || rc
== H_RESOURCE
) {
1921 * Wait around max init_timeout secs for the adapter to finish
1922 * initializing. When we are done initializing, we will have a
1923 * valid request_limit. We don't want Linux scanning before
1926 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1927 time_before(jiffies
, wait_switch
) &&
1928 atomic_read(&hostdata
->request_limit
) < 2;) {
1933 /* if we now have a valid request_limit, initiate a scan */
1934 if (atomic_read(&hostdata
->request_limit
) > 0)
1935 scsi_scan_host(host
);
1938 dev_set_drvdata(&vdev
->dev
, hostdata
);
1941 add_srp_port_failed
:
1942 scsi_remove_host(hostdata
->host
);
1944 release_event_pool(&hostdata
->pool
, hostdata
);
1946 ibmvscsi_ops
->release_crq_queue(&hostdata
->queue
, hostdata
, max_events
);
1948 unmap_persist_bufs(hostdata
);
1949 persist_bufs_failed
:
1950 scsi_host_put(host
);
1951 scsi_host_alloc_failed
:
1955 static int ibmvscsi_remove(struct vio_dev
*vdev
)
1957 struct ibmvscsi_host_data
*hostdata
= dev_get_drvdata(&vdev
->dev
);
1958 unmap_persist_bufs(hostdata
);
1959 release_event_pool(&hostdata
->pool
, hostdata
);
1960 ibmvscsi_ops
->release_crq_queue(&hostdata
->queue
, hostdata
,
1963 srp_remove_host(hostdata
->host
);
1964 scsi_remove_host(hostdata
->host
);
1965 scsi_host_put(hostdata
->host
);
1971 * ibmvscsi_resume: Resume from suspend
1972 * @dev: device struct
1974 * We may have lost an interrupt across suspend/resume, so kick the
1977 static int ibmvscsi_resume(struct device
*dev
)
1979 struct ibmvscsi_host_data
*hostdata
= dev_get_drvdata(dev
);
1980 return ibmvscsi_ops
->resume(hostdata
);
1984 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1987 static struct vio_device_id ibmvscsi_device_table
[] __devinitdata
= {
1988 {"vscsi", "IBM,v-scsi"},
1991 MODULE_DEVICE_TABLE(vio
, ibmvscsi_device_table
);
1993 static struct dev_pm_ops ibmvscsi_pm_ops
= {
1994 .resume
= ibmvscsi_resume
1997 static struct vio_driver ibmvscsi_driver
= {
1998 .id_table
= ibmvscsi_device_table
,
1999 .probe
= ibmvscsi_probe
,
2000 .remove
= ibmvscsi_remove
,
2001 .get_desired_dma
= ibmvscsi_get_desired_dma
,
2004 .owner
= THIS_MODULE
,
2005 .pm
= &ibmvscsi_pm_ops
,
2009 static struct srp_function_template ibmvscsi_transport_functions
= {
2012 int __init
ibmvscsi_module_init(void)
2016 /* Ensure we have two requests to do error recovery */
2017 driver_template
.can_queue
= max_requests
;
2018 max_events
= max_requests
+ 2;
2020 if (firmware_has_feature(FW_FEATURE_ISERIES
))
2021 ibmvscsi_ops
= &iseriesvscsi_ops
;
2022 else if (firmware_has_feature(FW_FEATURE_VIO
))
2023 ibmvscsi_ops
= &rpavscsi_ops
;
2027 ibmvscsi_transport_template
=
2028 srp_attach_transport(&ibmvscsi_transport_functions
);
2029 if (!ibmvscsi_transport_template
)
2032 ret
= vio_register_driver(&ibmvscsi_driver
);
2034 srp_release_transport(ibmvscsi_transport_template
);
2038 void __exit
ibmvscsi_module_exit(void)
2040 vio_unregister_driver(&ibmvscsi_driver
);
2041 srp_release_transport(ibmvscsi_transport_template
);
2044 module_init(ibmvscsi_module_init
);
2045 module_exit(ibmvscsi_module_exit
);