1 /* ------------------------------------------------------------
3 * (C) Copyright IBM Corporation 1994, 2004
4 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
5 * Santiago Leon (santil@us.ibm.com)
6 * Dave Boutcher (sleddog@us.ibm.com)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
23 * ------------------------------------------------------------
24 * Emulation of a SCSI host adapter for Virtual I/O devices
26 * This driver supports the SCSI adapter implemented by the IBM
27 * Power5 firmware. That SCSI adapter is not a physical adapter,
28 * but allows Linux SCSI peripheral drivers to directly
29 * access devices in another logical partition on the physical system.
31 * The virtual adapter(s) are present in the open firmware device
32 * tree just like real adapters.
34 * One of the capabilities provided on these systems is the ability
35 * to DMA between partitions. The architecture states that for VSCSI,
36 * the server side is allowed to DMA to and from the client. The client
37 * is never trusted to DMA to or from the server directly.
39 * Messages are sent between partitions on a "Command/Response Queue"
40 * (CRQ), which is just a buffer of 16 byte entries in the receiver's
41 * Senders cannot access the buffer directly, but send messages by
42 * making a hypervisor call and passing in the 16 bytes. The hypervisor
43 * puts the message in the next 16 byte space in round-robbin fashion,
44 * turns on the high order bit of the message (the valid bit), and
45 * generates an interrupt to the receiver (if interrupts are turned on.)
46 * The receiver just turns off the valid bit when they have copied out
49 * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
50 * (IU) (as defined in the T10 standard available at www.t10.org), gets
51 * a DMA address for the message, and sends it to the server as the
52 * payload of a CRQ message. The server DMAs the SRP IU and processes it,
53 * including doing any additional data transfers. When it is done, it
54 * DMAs the SRP response back to the same address as the request came from,
55 * and sends a CRQ message back to inform the client that the request has
58 * Note that some of the underlying infrastructure is different between
59 * machines conforming to the "RS/6000 Platform Architecture" (RPA) and
60 * the older iSeries hypervisor models. To support both, some low level
61 * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c.
62 * The Makefile should pick one, not two, not zero, of these.
64 * TODO: This is currently pretty tied to the IBM i/pSeries hypervisor
65 * interfaces. It would be really nice to abstract this above an RDMA
69 #include <linux/module.h>
70 #include <linux/moduleparam.h>
71 #include <linux/dma-mapping.h>
72 #include <linux/delay.h>
74 #include <scsi/scsi.h>
75 #include <scsi/scsi_cmnd.h>
76 #include <scsi/scsi_host.h>
77 #include <scsi/scsi_device.h>
80 /* The values below are somewhat arbitrary default values, but
81 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
82 * Note that there are 3 bits of channel value, 6 bits of id, and
85 static int max_id
= 64;
86 static int max_channel
= 3;
87 static int init_timeout
= 5;
88 static int max_requests
= IBMVSCSI_MAX_REQUESTS_DEFAULT
;
90 #define IBMVSCSI_VERSION "1.5.8"
92 MODULE_DESCRIPTION("IBM Virtual SCSI");
93 MODULE_AUTHOR("Dave Boutcher");
94 MODULE_LICENSE("GPL");
95 MODULE_VERSION(IBMVSCSI_VERSION
);
97 module_param_named(max_id
, max_id
, int, S_IRUGO
| S_IWUSR
);
98 MODULE_PARM_DESC(max_id
, "Largest ID value for each channel");
99 module_param_named(max_channel
, max_channel
, int, S_IRUGO
| S_IWUSR
);
100 MODULE_PARM_DESC(max_channel
, "Largest channel value");
101 module_param_named(init_timeout
, init_timeout
, int, S_IRUGO
| S_IWUSR
);
102 MODULE_PARM_DESC(init_timeout
, "Initialization timeout in seconds");
103 module_param_named(max_requests
, max_requests
, int, S_IRUGO
| S_IWUSR
);
104 MODULE_PARM_DESC(max_requests
, "Maximum requests for this adapter");
106 /* ------------------------------------------------------------
107 * Routines for the event pool and event structs
110 * initialize_event_pool: - Allocates and initializes the event pool for a host
111 * @pool: event_pool to be initialized
112 * @size: Number of events in pool
113 * @hostdata: ibmvscsi_host_data who owns the event pool
115 * Returns zero on success.
117 static int initialize_event_pool(struct event_pool
*pool
,
118 int size
, struct ibmvscsi_host_data
*hostdata
)
124 pool
->events
= kcalloc(pool
->size
, sizeof(*pool
->events
), GFP_KERNEL
);
129 dma_alloc_coherent(hostdata
->dev
,
130 pool
->size
* sizeof(*pool
->iu_storage
),
132 if (!pool
->iu_storage
) {
137 for (i
= 0; i
< pool
->size
; ++i
) {
138 struct srp_event_struct
*evt
= &pool
->events
[i
];
139 memset(&evt
->crq
, 0x00, sizeof(evt
->crq
));
140 atomic_set(&evt
->free
, 1);
141 evt
->crq
.valid
= 0x80;
142 evt
->crq
.IU_length
= sizeof(*evt
->xfer_iu
);
143 evt
->crq
.IU_data_ptr
= pool
->iu_token
+
144 sizeof(*evt
->xfer_iu
) * i
;
145 evt
->xfer_iu
= pool
->iu_storage
+ i
;
146 evt
->hostdata
= hostdata
;
147 evt
->ext_list
= NULL
;
148 evt
->ext_list_token
= 0;
155 * release_event_pool: - Frees memory of an event pool of a host
156 * @pool: event_pool to be released
157 * @hostdata: ibmvscsi_host_data who owns the even pool
159 * Returns zero on success.
161 static void release_event_pool(struct event_pool
*pool
,
162 struct ibmvscsi_host_data
*hostdata
)
165 for (i
= 0; i
< pool
->size
; ++i
) {
166 if (atomic_read(&pool
->events
[i
].free
) != 1)
168 if (pool
->events
[i
].ext_list
) {
169 dma_free_coherent(hostdata
->dev
,
170 SG_ALL
* sizeof(struct srp_direct_buf
),
171 pool
->events
[i
].ext_list
,
172 pool
->events
[i
].ext_list_token
);
176 dev_warn(hostdata
->dev
, "releasing event pool with %d "
177 "events still in use?\n", in_use
);
179 dma_free_coherent(hostdata
->dev
,
180 pool
->size
* sizeof(*pool
->iu_storage
),
181 pool
->iu_storage
, pool
->iu_token
);
185 * valid_event_struct: - Determines if event is valid.
186 * @pool: event_pool that contains the event
187 * @evt: srp_event_struct to be checked for validity
189 * Returns zero if event is invalid, one otherwise.
191 static int valid_event_struct(struct event_pool
*pool
,
192 struct srp_event_struct
*evt
)
194 int index
= evt
- pool
->events
;
195 if (index
< 0 || index
>= pool
->size
) /* outside of bounds */
197 if (evt
!= pool
->events
+ index
) /* unaligned */
203 * ibmvscsi_free-event_struct: - Changes status of event to "free"
204 * @pool: event_pool that contains the event
205 * @evt: srp_event_struct to be modified
208 static void free_event_struct(struct event_pool
*pool
,
209 struct srp_event_struct
*evt
)
211 if (!valid_event_struct(pool
, evt
)) {
212 dev_err(evt
->hostdata
->dev
, "Freeing invalid event_struct %p "
213 "(not in pool %p)\n", evt
, pool
->events
);
216 if (atomic_inc_return(&evt
->free
) != 1) {
217 dev_err(evt
->hostdata
->dev
, "Freeing event_struct %p "
218 "which is not in use!\n", evt
);
224 * get_evt_struct: - Gets the next free event in pool
225 * @pool: event_pool that contains the events to be searched
227 * Returns the next event in "free" state, and NULL if none are free.
228 * Note that no synchronization is done here, we assume the host_lock
229 * will syncrhonze things.
231 static struct srp_event_struct
*get_event_struct(struct event_pool
*pool
)
234 int poolsize
= pool
->size
;
235 int offset
= pool
->next
;
237 for (i
= 0; i
< poolsize
; i
++) {
238 offset
= (offset
+ 1) % poolsize
;
239 if (!atomic_dec_if_positive(&pool
->events
[offset
].free
)) {
241 return &pool
->events
[offset
];
245 printk(KERN_ERR
"ibmvscsi: found no event struct in pool!\n");
250 * init_event_struct: Initialize fields in an event struct that are always
253 * @done: Routine to call when the event is responded to
254 * @format: SRP or MAD format
255 * @timeout: timeout value set in the CRQ
257 static void init_event_struct(struct srp_event_struct
*evt_struct
,
258 void (*done
) (struct srp_event_struct
*),
262 evt_struct
->cmnd
= NULL
;
263 evt_struct
->cmnd_done
= NULL
;
264 evt_struct
->sync_srp
= NULL
;
265 evt_struct
->crq
.format
= format
;
266 evt_struct
->crq
.timeout
= timeout
;
267 evt_struct
->done
= done
;
270 /* ------------------------------------------------------------
271 * Routines for receiving SCSI responses from the hosting partition
275 * set_srp_direction: Set the fields in the srp related to data
276 * direction and number of buffers based on the direction in
277 * the scsi_cmnd and the number of buffers
279 static void set_srp_direction(struct scsi_cmnd
*cmd
,
280 struct srp_cmd
*srp_cmd
,
289 fmt
= SRP_DATA_DESC_DIRECT
;
291 fmt
= SRP_DATA_DESC_INDIRECT
;
292 numbuf
= min(numbuf
, MAX_INDIRECT_BUFS
);
294 if (cmd
->sc_data_direction
== DMA_TO_DEVICE
)
295 srp_cmd
->data_out_desc_cnt
= numbuf
;
297 srp_cmd
->data_in_desc_cnt
= numbuf
;
300 if (cmd
->sc_data_direction
== DMA_TO_DEVICE
)
301 srp_cmd
->buf_fmt
= fmt
<< 4;
303 srp_cmd
->buf_fmt
= fmt
;
306 static void unmap_sg_list(int num_entries
,
308 struct srp_direct_buf
*md
)
312 for (i
= 0; i
< num_entries
; ++i
)
313 dma_unmap_single(dev
, md
[i
].va
, md
[i
].len
, DMA_BIDIRECTIONAL
);
317 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
318 * @cmd: srp_cmd whose additional_data member will be unmapped
319 * @dev: device for which the memory is mapped
322 static void unmap_cmd_data(struct srp_cmd
*cmd
,
323 struct srp_event_struct
*evt_struct
,
328 out_fmt
= cmd
->buf_fmt
>> 4;
329 in_fmt
= cmd
->buf_fmt
& ((1U << 4) - 1);
331 if (out_fmt
== SRP_NO_DATA_DESC
&& in_fmt
== SRP_NO_DATA_DESC
)
333 else if (out_fmt
== SRP_DATA_DESC_DIRECT
||
334 in_fmt
== SRP_DATA_DESC_DIRECT
) {
335 struct srp_direct_buf
*data
=
336 (struct srp_direct_buf
*) cmd
->add_data
;
337 dma_unmap_single(dev
, data
->va
, data
->len
, DMA_BIDIRECTIONAL
);
339 struct srp_indirect_buf
*indirect
=
340 (struct srp_indirect_buf
*) cmd
->add_data
;
341 int num_mapped
= indirect
->table_desc
.len
/
342 sizeof(struct srp_direct_buf
);
344 if (num_mapped
<= MAX_INDIRECT_BUFS
) {
345 unmap_sg_list(num_mapped
, dev
, &indirect
->desc_list
[0]);
349 unmap_sg_list(num_mapped
, dev
, evt_struct
->ext_list
);
353 static int map_sg_list(struct scsi_cmnd
*cmd
, int nseg
,
354 struct srp_direct_buf
*md
)
357 struct scatterlist
*sg
;
358 u64 total_length
= 0;
360 scsi_for_each_sg(cmd
, sg
, nseg
, i
) {
361 struct srp_direct_buf
*descr
= md
+ i
;
362 descr
->va
= sg_dma_address(sg
);
363 descr
->len
= sg_dma_len(sg
);
365 total_length
+= sg_dma_len(sg
);
371 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
372 * @cmd: Scsi_Cmnd with the scatterlist
373 * @srp_cmd: srp_cmd that contains the memory descriptor
374 * @dev: device for which to map dma memory
376 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
377 * Returns 1 on success.
379 static int map_sg_data(struct scsi_cmnd
*cmd
,
380 struct srp_event_struct
*evt_struct
,
381 struct srp_cmd
*srp_cmd
, struct device
*dev
)
385 u64 total_length
= 0;
386 struct srp_direct_buf
*data
=
387 (struct srp_direct_buf
*) srp_cmd
->add_data
;
388 struct srp_indirect_buf
*indirect
=
389 (struct srp_indirect_buf
*) data
;
391 sg_mapped
= scsi_dma_map(cmd
);
394 else if (sg_mapped
< 0)
397 set_srp_direction(cmd
, srp_cmd
, sg_mapped
);
399 /* special case; we can use a single direct descriptor */
400 if (sg_mapped
== 1) {
401 map_sg_list(cmd
, sg_mapped
, data
);
405 indirect
->table_desc
.va
= 0;
406 indirect
->table_desc
.len
= sg_mapped
* sizeof(struct srp_direct_buf
);
407 indirect
->table_desc
.key
= 0;
409 if (sg_mapped
<= MAX_INDIRECT_BUFS
) {
410 total_length
= map_sg_list(cmd
, sg_mapped
,
411 &indirect
->desc_list
[0]);
412 indirect
->len
= total_length
;
416 /* get indirect table */
417 if (!evt_struct
->ext_list
) {
418 evt_struct
->ext_list
= (struct srp_direct_buf
*)
419 dma_alloc_coherent(dev
,
420 SG_ALL
* sizeof(struct srp_direct_buf
),
421 &evt_struct
->ext_list_token
, 0);
422 if (!evt_struct
->ext_list
) {
423 sdev_printk(KERN_ERR
, cmd
->device
,
424 "Can't allocate memory for indirect table\n");
429 total_length
= map_sg_list(cmd
, sg_mapped
, evt_struct
->ext_list
);
431 indirect
->len
= total_length
;
432 indirect
->table_desc
.va
= evt_struct
->ext_list_token
;
433 indirect
->table_desc
.len
= sg_mapped
* sizeof(indirect
->desc_list
[0]);
434 memcpy(indirect
->desc_list
, evt_struct
->ext_list
,
435 MAX_INDIRECT_BUFS
* sizeof(struct srp_direct_buf
));
440 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
441 * @cmd: struct scsi_cmnd with the memory to be mapped
442 * @srp_cmd: srp_cmd that contains the memory descriptor
443 * @dev: dma device for which to map dma memory
445 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
446 * Returns 1 on success.
448 static int map_data_for_srp_cmd(struct scsi_cmnd
*cmd
,
449 struct srp_event_struct
*evt_struct
,
450 struct srp_cmd
*srp_cmd
, struct device
*dev
)
452 switch (cmd
->sc_data_direction
) {
453 case DMA_FROM_DEVICE
:
458 case DMA_BIDIRECTIONAL
:
459 sdev_printk(KERN_ERR
, cmd
->device
,
460 "Can't map DMA_BIDIRECTIONAL to read/write\n");
463 sdev_printk(KERN_ERR
, cmd
->device
,
464 "Unknown data direction 0x%02x; can't map!\n",
465 cmd
->sc_data_direction
);
469 return map_sg_data(cmd
, evt_struct
, srp_cmd
, dev
);
473 * purge_requests: Our virtual adapter just shut down. purge any sent requests
474 * @hostdata: the adapter
476 static void purge_requests(struct ibmvscsi_host_data
*hostdata
, int error_code
)
478 struct srp_event_struct
*tmp_evt
, *pos
;
481 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
482 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
483 list_del(&tmp_evt
->list
);
484 del_timer(&tmp_evt
->timer
);
486 tmp_evt
->cmnd
->result
= (error_code
<< 16);
487 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
,
489 tmp_evt
->hostdata
->dev
);
490 if (tmp_evt
->cmnd_done
)
491 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
492 } else if (tmp_evt
->done
)
493 tmp_evt
->done(tmp_evt
);
494 free_event_struct(&tmp_evt
->hostdata
->pool
, tmp_evt
);
496 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
500 * ibmvscsi_reset_host - Reset the connection to the server
501 * @hostdata: struct ibmvscsi_host_data to reset
503 static void ibmvscsi_reset_host(struct ibmvscsi_host_data
*hostdata
)
505 scsi_block_requests(hostdata
->host
);
506 atomic_set(&hostdata
->request_limit
, 0);
508 purge_requests(hostdata
, DID_ERROR
);
509 if ((ibmvscsi_reset_crq_queue(&hostdata
->queue
, hostdata
)) ||
510 (ibmvscsi_send_crq(hostdata
, 0xC001000000000000LL
, 0)) ||
511 (vio_enable_interrupts(to_vio_dev(hostdata
->dev
)))) {
512 atomic_set(&hostdata
->request_limit
, -1);
513 dev_err(hostdata
->dev
, "error after reset\n");
516 scsi_unblock_requests(hostdata
->host
);
520 * ibmvscsi_timeout - Internal command timeout handler
521 * @evt_struct: struct srp_event_struct that timed out
523 * Called when an internally generated command times out
525 static void ibmvscsi_timeout(struct srp_event_struct
*evt_struct
)
527 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
529 dev_err(hostdata
->dev
, "Command timed out (%x). Resetting connection\n",
530 evt_struct
->iu
.srp
.cmd
.opcode
);
532 ibmvscsi_reset_host(hostdata
);
536 /* ------------------------------------------------------------
537 * Routines for sending and receiving SRPs
540 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
541 * @evt_struct: evt_struct to be sent
542 * @hostdata: ibmvscsi_host_data of host
543 * @timeout: timeout in seconds - 0 means do not time command
545 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
546 * Note that this routine assumes that host_lock is held for synchronization
548 static int ibmvscsi_send_srp_event(struct srp_event_struct
*evt_struct
,
549 struct ibmvscsi_host_data
*hostdata
,
550 unsigned long timeout
)
552 u64
*crq_as_u64
= (u64
*) &evt_struct
->crq
;
556 /* If we have exhausted our request limit, just fail this request,
557 * unless it is for a reset or abort.
558 * Note that there are rare cases involving driver generated requests
559 * (such as task management requests) that the mid layer may think we
560 * can handle more requests (can_queue) when we actually can't
562 if (evt_struct
->crq
.format
== VIOSRP_SRP_FORMAT
) {
564 atomic_dec_if_positive(&hostdata
->request_limit
);
565 /* If request limit was -1 when we started, it is now even
568 if (request_status
< -1)
570 /* Otherwise, we may have run out of requests. */
571 /* Abort and reset calls should make it through.
572 * Nothing except abort and reset should use the last two
573 * slots unless we had two or less to begin with.
575 else if (request_status
< 2 &&
576 evt_struct
->iu
.srp
.cmd
.opcode
!= SRP_TSK_MGMT
) {
577 /* In the case that we have less than two requests
578 * available, check the server limit as a combination
579 * of the request limit and the number of requests
580 * in-flight (the size of the send list). If the
581 * server limit is greater than 2, return busy so
582 * that the last two are reserved for reset and abort.
584 int server_limit
= request_status
;
585 struct srp_event_struct
*tmp_evt
;
587 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
591 if (server_limit
> 2)
596 /* Copy the IU into the transfer area */
597 *evt_struct
->xfer_iu
= evt_struct
->iu
;
598 evt_struct
->xfer_iu
->srp
.rsp
.tag
= (u64
)evt_struct
;
600 /* Add this to the sent list. We need to do this
601 * before we actually send
602 * in case it comes back REALLY fast
604 list_add_tail(&evt_struct
->list
, &hostdata
->sent
);
606 init_timer(&evt_struct
->timer
);
608 evt_struct
->timer
.data
= (unsigned long) evt_struct
;
609 evt_struct
->timer
.expires
= jiffies
+ (timeout
* HZ
);
610 evt_struct
->timer
.function
= (void (*)(unsigned long))ibmvscsi_timeout
;
611 add_timer(&evt_struct
->timer
);
615 ibmvscsi_send_crq(hostdata
, crq_as_u64
[0], crq_as_u64
[1])) != 0) {
616 list_del(&evt_struct
->list
);
617 del_timer(&evt_struct
->timer
);
619 dev_err(hostdata
->dev
, "send error %d\n", rc
);
620 atomic_inc(&hostdata
->request_limit
);
627 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
629 free_event_struct(&hostdata
->pool
, evt_struct
);
630 atomic_inc(&hostdata
->request_limit
);
631 return SCSI_MLQUEUE_HOST_BUSY
;
634 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
636 if (evt_struct
->cmnd
!= NULL
) {
637 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
638 evt_struct
->cmnd_done(evt_struct
->cmnd
);
639 } else if (evt_struct
->done
)
640 evt_struct
->done(evt_struct
);
642 free_event_struct(&hostdata
->pool
, evt_struct
);
647 * handle_cmd_rsp: - Handle responses from commands
648 * @evt_struct: srp_event_struct to be handled
650 * Used as a callback by when sending scsi cmds.
651 * Gets called by ibmvscsi_handle_crq()
653 static void handle_cmd_rsp(struct srp_event_struct
*evt_struct
)
655 struct srp_rsp
*rsp
= &evt_struct
->xfer_iu
->srp
.rsp
;
656 struct scsi_cmnd
*cmnd
= evt_struct
->cmnd
;
658 if (unlikely(rsp
->opcode
!= SRP_RSP
)) {
659 if (printk_ratelimit())
660 dev_warn(evt_struct
->hostdata
->dev
,
661 "bad SRP RSP type %d\n", rsp
->opcode
);
665 cmnd
->result
= rsp
->status
;
666 if (((cmnd
->result
>> 1) & 0x1f) == CHECK_CONDITION
)
667 memcpy(cmnd
->sense_buffer
,
669 rsp
->sense_data_len
);
670 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
,
672 evt_struct
->hostdata
->dev
);
674 if (rsp
->flags
& SRP_RSP_FLAG_DOOVER
)
675 scsi_set_resid(cmnd
, rsp
->data_out_res_cnt
);
676 else if (rsp
->flags
& SRP_RSP_FLAG_DIOVER
)
677 scsi_set_resid(cmnd
, rsp
->data_in_res_cnt
);
680 if (evt_struct
->cmnd_done
)
681 evt_struct
->cmnd_done(cmnd
);
685 * lun_from_dev: - Returns the lun of the scsi device
686 * @dev: struct scsi_device
689 static inline u16
lun_from_dev(struct scsi_device
*dev
)
691 return (0x2 << 14) | (dev
->id
<< 8) | (dev
->channel
<< 5) | dev
->lun
;
695 * ibmvscsi_queue: - The queuecommand function of the scsi template
696 * @cmd: struct scsi_cmnd to be executed
697 * @done: Callback function to be called when cmd is completed
699 static int ibmvscsi_queuecommand(struct scsi_cmnd
*cmnd
,
700 void (*done
) (struct scsi_cmnd
*))
702 struct srp_cmd
*srp_cmd
;
703 struct srp_event_struct
*evt_struct
;
704 struct srp_indirect_buf
*indirect
;
705 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmnd
->device
->host
);
706 u16 lun
= lun_from_dev(cmnd
->device
);
709 evt_struct
= get_event_struct(&hostdata
->pool
);
711 return SCSI_MLQUEUE_HOST_BUSY
;
713 /* Set up the actual SRP IU */
714 srp_cmd
= &evt_struct
->iu
.srp
.cmd
;
715 memset(srp_cmd
, 0x00, SRP_MAX_IU_LEN
);
716 srp_cmd
->opcode
= SRP_CMD
;
717 memcpy(srp_cmd
->cdb
, cmnd
->cmnd
, sizeof(cmnd
->cmnd
));
718 srp_cmd
->lun
= ((u64
) lun
) << 48;
720 if (!map_data_for_srp_cmd(cmnd
, evt_struct
, srp_cmd
, hostdata
->dev
)) {
721 sdev_printk(KERN_ERR
, cmnd
->device
, "couldn't convert cmd to srp_cmd\n");
722 free_event_struct(&hostdata
->pool
, evt_struct
);
723 return SCSI_MLQUEUE_HOST_BUSY
;
726 init_event_struct(evt_struct
,
729 cmnd
->timeout_per_command
/HZ
);
731 evt_struct
->cmnd
= cmnd
;
732 evt_struct
->cmnd_done
= done
;
734 /* Fix up dma address of the buffer itself */
735 indirect
= (struct srp_indirect_buf
*) srp_cmd
->add_data
;
736 out_fmt
= srp_cmd
->buf_fmt
>> 4;
737 in_fmt
= srp_cmd
->buf_fmt
& ((1U << 4) - 1);
738 if ((in_fmt
== SRP_DATA_DESC_INDIRECT
||
739 out_fmt
== SRP_DATA_DESC_INDIRECT
) &&
740 indirect
->table_desc
.va
== 0) {
741 indirect
->table_desc
.va
= evt_struct
->crq
.IU_data_ptr
+
742 offsetof(struct srp_cmd
, add_data
) +
743 offsetof(struct srp_indirect_buf
, desc_list
);
746 return ibmvscsi_send_srp_event(evt_struct
, hostdata
, 0);
749 /* ------------------------------------------------------------
750 * Routines for driver initialization
753 * adapter_info_rsp: - Handle response to MAD adapter info request
754 * @evt_struct: srp_event_struct with the response
756 * Used as a "done" callback by when sending adapter_info. Gets called
757 * by ibmvscsi_handle_crq()
759 static void adapter_info_rsp(struct srp_event_struct
*evt_struct
)
761 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
762 dma_unmap_single(hostdata
->dev
,
763 evt_struct
->iu
.mad
.adapter_info
.buffer
,
764 evt_struct
->iu
.mad
.adapter_info
.common
.length
,
767 if (evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
) {
768 dev_err(hostdata
->dev
, "error %d getting adapter info\n",
769 evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
);
771 dev_info(hostdata
->dev
, "host srp version: %s, "
772 "host partition %s (%d), OS %d, max io %u\n",
773 hostdata
->madapter_info
.srp_version
,
774 hostdata
->madapter_info
.partition_name
,
775 hostdata
->madapter_info
.partition_number
,
776 hostdata
->madapter_info
.os_type
,
777 hostdata
->madapter_info
.port_max_txu
[0]);
779 if (hostdata
->madapter_info
.port_max_txu
[0])
780 hostdata
->host
->max_sectors
=
781 hostdata
->madapter_info
.port_max_txu
[0] >> 9;
783 if (hostdata
->madapter_info
.os_type
== 3 &&
784 strcmp(hostdata
->madapter_info
.srp_version
, "1.6a") <= 0) {
785 dev_err(hostdata
->dev
, "host (Ver. %s) doesn't support large transfers\n",
786 hostdata
->madapter_info
.srp_version
);
787 dev_err(hostdata
->dev
, "limiting scatterlists to %d\n",
789 hostdata
->host
->sg_tablesize
= MAX_INDIRECT_BUFS
;
795 * send_mad_adapter_info: - Sends the mad adapter info request
796 * and stores the result so it can be retrieved with
797 * sysfs. We COULD consider causing a failure if the
798 * returned SRP version doesn't match ours.
799 * @hostdata: ibmvscsi_host_data of host
801 * Returns zero if successful.
803 static void send_mad_adapter_info(struct ibmvscsi_host_data
*hostdata
)
805 struct viosrp_adapter_info
*req
;
806 struct srp_event_struct
*evt_struct
;
810 evt_struct
= get_event_struct(&hostdata
->pool
);
812 dev_err(hostdata
->dev
,
813 "couldn't allocate an event for ADAPTER_INFO_REQ!\n");
817 init_event_struct(evt_struct
,
822 req
= &evt_struct
->iu
.mad
.adapter_info
;
823 memset(req
, 0x00, sizeof(*req
));
825 req
->common
.type
= VIOSRP_ADAPTER_INFO_TYPE
;
826 req
->common
.length
= sizeof(hostdata
->madapter_info
);
827 req
->buffer
= addr
= dma_map_single(hostdata
->dev
,
828 &hostdata
->madapter_info
,
829 sizeof(hostdata
->madapter_info
),
832 if (dma_mapping_error(req
->buffer
)) {
833 dev_err(hostdata
->dev
, "Unable to map request_buffer for adapter_info!\n");
834 free_event_struct(&hostdata
->pool
, evt_struct
);
838 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
839 if (ibmvscsi_send_srp_event(evt_struct
, hostdata
, init_timeout
* 2)) {
840 dev_err(hostdata
->dev
, "couldn't send ADAPTER_INFO_REQ!\n");
841 dma_unmap_single(hostdata
->dev
,
843 sizeof(hostdata
->madapter_info
),
846 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
850 * login_rsp: - Handle response to SRP login request
851 * @evt_struct: srp_event_struct with the response
853 * Used as a "done" callback by when sending srp_login. Gets called
854 * by ibmvscsi_handle_crq()
856 static void login_rsp(struct srp_event_struct
*evt_struct
)
858 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
859 switch (evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
) {
860 case SRP_LOGIN_RSP
: /* it worked! */
862 case SRP_LOGIN_REJ
: /* refused! */
863 dev_info(hostdata
->dev
, "SRP_LOGIN_REJ reason %u\n",
864 evt_struct
->xfer_iu
->srp
.login_rej
.reason
);
866 atomic_set(&hostdata
->request_limit
, -1);
869 dev_err(hostdata
->dev
, "Invalid login response typecode 0x%02x!\n",
870 evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
);
872 atomic_set(&hostdata
->request_limit
, -1);
876 dev_info(hostdata
->dev
, "SRP_LOGIN succeeded\n");
878 if (evt_struct
->xfer_iu
->srp
.login_rsp
.req_lim_delta
< 0)
879 dev_err(hostdata
->dev
, "Invalid request_limit.\n");
881 /* Now we know what the real request-limit is.
882 * This value is set rather than added to request_limit because
883 * request_limit could have been set to -1 by this client.
885 atomic_set(&hostdata
->request_limit
,
886 evt_struct
->xfer_iu
->srp
.login_rsp
.req_lim_delta
);
888 /* If we had any pending I/Os, kick them */
889 scsi_unblock_requests(hostdata
->host
);
891 send_mad_adapter_info(hostdata
);
896 * send_srp_login: - Sends the srp login
897 * @hostdata: ibmvscsi_host_data of host
899 * Returns zero if successful.
901 static int send_srp_login(struct ibmvscsi_host_data
*hostdata
)
905 struct srp_login_req
*login
;
906 struct srp_event_struct
*evt_struct
= get_event_struct(&hostdata
->pool
);
908 dev_err(hostdata
->dev
, "couldn't allocate an event for login req!\n");
912 init_event_struct(evt_struct
,
917 login
= &evt_struct
->iu
.srp
.login_req
;
918 memset(login
, 0x00, sizeof(struct srp_login_req
));
919 login
->opcode
= SRP_LOGIN_REQ
;
920 login
->req_it_iu_len
= sizeof(union srp_iu
);
921 login
->req_buf_fmt
= SRP_BUF_FORMAT_DIRECT
| SRP_BUF_FORMAT_INDIRECT
;
923 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
924 /* Start out with a request limit of 1, since this is negotiated in
925 * the login request we are just sending
927 atomic_set(&hostdata
->request_limit
, 1);
929 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, init_timeout
* 2);
930 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
931 dev_info(hostdata
->dev
, "sent SRP login\n");
936 * sync_completion: Signal that a synchronous command has completed
937 * Note that after returning from this call, the evt_struct is freed.
938 * the caller waiting on this completion shouldn't touch the evt_struct
941 static void sync_completion(struct srp_event_struct
*evt_struct
)
943 /* copy the response back */
944 if (evt_struct
->sync_srp
)
945 *evt_struct
->sync_srp
= *evt_struct
->xfer_iu
;
947 complete(&evt_struct
->comp
);
951 * ibmvscsi_abort: Abort a command...from scsi host template
952 * send this over to the server and wait synchronously for the response
954 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd
*cmd
)
956 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
957 struct srp_tsk_mgmt
*tsk_mgmt
;
958 struct srp_event_struct
*evt
;
959 struct srp_event_struct
*tmp_evt
, *found_evt
;
960 union viosrp_iu srp_rsp
;
963 u16 lun
= lun_from_dev(cmd
->device
);
965 /* First, find this command in our sent list so we can figure
966 * out the correct tag
968 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
970 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
971 if (tmp_evt
->cmnd
== cmd
) {
978 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
982 evt
= get_event_struct(&hostdata
->pool
);
984 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
985 sdev_printk(KERN_ERR
, cmd
->device
, "failed to allocate abort event\n");
989 init_event_struct(evt
,
994 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
996 /* Set up an abort SRP command */
997 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
998 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
999 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1000 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_ABORT_TASK
;
1001 tsk_mgmt
->task_tag
= (u64
) found_evt
;
1003 sdev_printk(KERN_INFO
, cmd
->device
, "aborting command. lun 0x%lx, tag 0x%lx\n",
1004 tsk_mgmt
->lun
, tsk_mgmt
->task_tag
);
1006 evt
->sync_srp
= &srp_rsp
;
1007 init_completion(&evt
->comp
);
1008 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, init_timeout
* 2);
1009 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1011 sdev_printk(KERN_ERR
, cmd
->device
,
1012 "failed to send abort() event. rc=%d\n", rsp_rc
);
1016 wait_for_completion(&evt
->comp
);
1018 /* make sure we got a good response */
1019 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1020 if (printk_ratelimit())
1021 sdev_printk(KERN_WARNING
, cmd
->device
, "abort bad SRP RSP type %d\n",
1022 srp_rsp
.srp
.rsp
.opcode
);
1026 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1027 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1029 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1032 if (printk_ratelimit())
1033 sdev_printk(KERN_WARNING
, cmd
->device
,
1034 "abort code %d for task tag 0x%lx\n",
1035 rsp_rc
, tsk_mgmt
->task_tag
);
1039 /* Because we dropped the spinlock above, it's possible
1040 * The event is no longer in our list. Make sure it didn't
1041 * complete while we were aborting
1043 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1045 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1046 if (tmp_evt
->cmnd
== cmd
) {
1047 found_evt
= tmp_evt
;
1052 if (found_evt
== NULL
) {
1053 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1054 sdev_printk(KERN_INFO
, cmd
->device
, "aborted task tag 0x%lx completed\n",
1055 tsk_mgmt
->task_tag
);
1059 sdev_printk(KERN_INFO
, cmd
->device
, "successfully aborted task tag 0x%lx\n",
1060 tsk_mgmt
->task_tag
);
1062 cmd
->result
= (DID_ABORT
<< 16);
1063 list_del(&found_evt
->list
);
1064 unmap_cmd_data(&found_evt
->iu
.srp
.cmd
, found_evt
,
1065 found_evt
->hostdata
->dev
);
1066 free_event_struct(&found_evt
->hostdata
->pool
, found_evt
);
1067 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1068 atomic_inc(&hostdata
->request_limit
);
1073 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1074 * template send this over to the server and wait synchronously for the
1077 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd
*cmd
)
1079 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1080 struct srp_tsk_mgmt
*tsk_mgmt
;
1081 struct srp_event_struct
*evt
;
1082 struct srp_event_struct
*tmp_evt
, *pos
;
1083 union viosrp_iu srp_rsp
;
1085 unsigned long flags
;
1086 u16 lun
= lun_from_dev(cmd
->device
);
1088 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1089 evt
= get_event_struct(&hostdata
->pool
);
1091 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1092 sdev_printk(KERN_ERR
, cmd
->device
, "failed to allocate reset event\n");
1096 init_event_struct(evt
,
1101 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1103 /* Set up a lun reset SRP command */
1104 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1105 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1106 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1107 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_LUN_RESET
;
1109 sdev_printk(KERN_INFO
, cmd
->device
, "resetting device. lun 0x%lx\n",
1112 evt
->sync_srp
= &srp_rsp
;
1113 init_completion(&evt
->comp
);
1114 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, init_timeout
* 2);
1115 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1117 sdev_printk(KERN_ERR
, cmd
->device
,
1118 "failed to send reset event. rc=%d\n", rsp_rc
);
1122 wait_for_completion(&evt
->comp
);
1124 /* make sure we got a good response */
1125 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1126 if (printk_ratelimit())
1127 sdev_printk(KERN_WARNING
, cmd
->device
, "reset bad SRP RSP type %d\n",
1128 srp_rsp
.srp
.rsp
.opcode
);
1132 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1133 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1135 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1138 if (printk_ratelimit())
1139 sdev_printk(KERN_WARNING
, cmd
->device
,
1140 "reset code %d for task tag 0x%lx\n",
1141 rsp_rc
, tsk_mgmt
->task_tag
);
1145 /* We need to find all commands for this LUN that have not yet been
1146 * responded to, and fail them with DID_RESET
1148 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1149 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
1150 if ((tmp_evt
->cmnd
) && (tmp_evt
->cmnd
->device
== cmd
->device
)) {
1152 tmp_evt
->cmnd
->result
= (DID_RESET
<< 16);
1153 list_del(&tmp_evt
->list
);
1154 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
, tmp_evt
,
1155 tmp_evt
->hostdata
->dev
);
1156 free_event_struct(&tmp_evt
->hostdata
->pool
,
1158 atomic_inc(&hostdata
->request_limit
);
1159 if (tmp_evt
->cmnd_done
)
1160 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
1161 else if (tmp_evt
->done
)
1162 tmp_evt
->done(tmp_evt
);
1165 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1170 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1171 * @cmd: struct scsi_cmnd having problems
1173 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd
*cmd
)
1175 unsigned long wait_switch
= 0;
1176 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1178 dev_err(hostdata
->dev
, "Resetting connection due to error recovery\n");
1180 ibmvscsi_reset_host(hostdata
);
1182 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1183 time_before(jiffies
, wait_switch
) &&
1184 atomic_read(&hostdata
->request_limit
) < 2;) {
1189 if (atomic_read(&hostdata
->request_limit
) <= 0)
1196 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1197 * @crq: Command/Response queue
1198 * @hostdata: ibmvscsi_host_data of host
1201 void ibmvscsi_handle_crq(struct viosrp_crq
*crq
,
1202 struct ibmvscsi_host_data
*hostdata
)
1205 unsigned long flags
;
1206 struct srp_event_struct
*evt_struct
=
1207 (struct srp_event_struct
*)crq
->IU_data_ptr
;
1208 switch (crq
->valid
) {
1209 case 0xC0: /* initialization */
1210 switch (crq
->format
) {
1211 case 0x01: /* Initialization message */
1212 dev_info(hostdata
->dev
, "partner initialized\n");
1213 /* Send back a response */
1214 if ((rc
= ibmvscsi_send_crq(hostdata
,
1215 0xC002000000000000LL
, 0)) == 0) {
1217 send_srp_login(hostdata
);
1219 dev_err(hostdata
->dev
, "Unable to send init rsp. rc=%ld\n", rc
);
1223 case 0x02: /* Initialization response */
1224 dev_info(hostdata
->dev
, "partner initialization complete\n");
1227 send_srp_login(hostdata
);
1230 dev_err(hostdata
->dev
, "unknown crq message type: %d\n", crq
->format
);
1233 case 0xFF: /* Hypervisor telling us the connection is closed */
1234 scsi_block_requests(hostdata
->host
);
1235 atomic_set(&hostdata
->request_limit
, 0);
1236 if (crq
->format
== 0x06) {
1237 /* We need to re-setup the interpartition connection */
1238 dev_info(hostdata
->dev
, "Re-enabling adapter!\n");
1239 purge_requests(hostdata
, DID_REQUEUE
);
1240 if ((ibmvscsi_reenable_crq_queue(&hostdata
->queue
,
1242 (ibmvscsi_send_crq(hostdata
,
1243 0xC001000000000000LL
, 0))) {
1244 atomic_set(&hostdata
->request_limit
,
1246 dev_err(hostdata
->dev
, "error after enable\n");
1249 dev_err(hostdata
->dev
, "Virtual adapter failed rc %d!\n",
1252 purge_requests(hostdata
, DID_ERROR
);
1253 if ((ibmvscsi_reset_crq_queue(&hostdata
->queue
,
1255 (ibmvscsi_send_crq(hostdata
,
1256 0xC001000000000000LL
, 0))) {
1257 atomic_set(&hostdata
->request_limit
,
1259 dev_err(hostdata
->dev
, "error after reset\n");
1262 scsi_unblock_requests(hostdata
->host
);
1264 case 0x80: /* real payload */
1267 dev_err(hostdata
->dev
, "got an invalid message type 0x%02x\n",
1272 /* The only kind of payload CRQs we should get are responses to
1273 * things we send. Make sure this response is to something we
1276 if (!valid_event_struct(&hostdata
->pool
, evt_struct
)) {
1277 dev_err(hostdata
->dev
, "returned correlation_token 0x%p is invalid!\n",
1278 (void *)crq
->IU_data_ptr
);
1282 if (atomic_read(&evt_struct
->free
)) {
1283 dev_err(hostdata
->dev
, "received duplicate correlation_token 0x%p!\n",
1284 (void *)crq
->IU_data_ptr
);
1288 if (crq
->format
== VIOSRP_SRP_FORMAT
)
1289 atomic_add(evt_struct
->xfer_iu
->srp
.rsp
.req_lim_delta
,
1290 &hostdata
->request_limit
);
1292 del_timer(&evt_struct
->timer
);
1294 if (evt_struct
->done
)
1295 evt_struct
->done(evt_struct
);
1297 dev_err(hostdata
->dev
, "returned done() is NULL; not running it!\n");
1300 * Lock the host_lock before messing with these structures, since we
1301 * are running in a task context
1303 spin_lock_irqsave(evt_struct
->hostdata
->host
->host_lock
, flags
);
1304 list_del(&evt_struct
->list
);
1305 free_event_struct(&evt_struct
->hostdata
->pool
, evt_struct
);
1306 spin_unlock_irqrestore(evt_struct
->hostdata
->host
->host_lock
, flags
);
1310 * ibmvscsi_get_host_config: Send the command to the server to get host
1311 * configuration data. The data is opaque to us.
1313 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data
*hostdata
,
1314 unsigned char *buffer
, int length
)
1316 struct viosrp_host_config
*host_config
;
1317 struct srp_event_struct
*evt_struct
;
1318 unsigned long flags
;
1322 evt_struct
= get_event_struct(&hostdata
->pool
);
1324 dev_err(hostdata
->dev
, "couldn't allocate event for HOST_CONFIG!\n");
1328 init_event_struct(evt_struct
,
1333 host_config
= &evt_struct
->iu
.mad
.host_config
;
1335 /* Set up a lun reset SRP command */
1336 memset(host_config
, 0x00, sizeof(*host_config
));
1337 host_config
->common
.type
= VIOSRP_HOST_CONFIG_TYPE
;
1338 host_config
->common
.length
= length
;
1339 host_config
->buffer
= addr
= dma_map_single(hostdata
->dev
, buffer
,
1343 if (dma_mapping_error(host_config
->buffer
)) {
1344 dev_err(hostdata
->dev
, "dma_mapping error getting host config\n");
1345 free_event_struct(&hostdata
->pool
, evt_struct
);
1349 init_completion(&evt_struct
->comp
);
1350 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1351 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, init_timeout
* 2);
1352 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1354 wait_for_completion(&evt_struct
->comp
);
1355 dma_unmap_single(hostdata
->dev
, addr
, length
, DMA_BIDIRECTIONAL
);
1361 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1362 * @sdev: struct scsi_device device to configure
1364 * Enable allow_restart for a device if it is a disk. Adjust the
1365 * queue_depth here also as is required by the documentation for
1366 * struct scsi_host_template.
1368 static int ibmvscsi_slave_configure(struct scsi_device
*sdev
)
1370 struct Scsi_Host
*shost
= sdev
->host
;
1371 unsigned long lock_flags
= 0;
1373 spin_lock_irqsave(shost
->host_lock
, lock_flags
);
1374 if (sdev
->type
== TYPE_DISK
)
1375 sdev
->allow_restart
= 1;
1376 scsi_adjust_queue_depth(sdev
, 0, shost
->cmd_per_lun
);
1377 spin_unlock_irqrestore(shost
->host_lock
, lock_flags
);
1382 * ibmvscsi_change_queue_depth - Change the device's queue depth
1383 * @sdev: scsi device struct
1384 * @qdepth: depth to set
1389 static int ibmvscsi_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
1391 if (qdepth
> IBMVSCSI_MAX_CMDS_PER_LUN
)
1392 qdepth
= IBMVSCSI_MAX_CMDS_PER_LUN
;
1394 scsi_adjust_queue_depth(sdev
, 0, qdepth
);
1395 return sdev
->queue_depth
;
1398 /* ------------------------------------------------------------
1401 static ssize_t
show_host_srp_version(struct class_device
*class_dev
, char *buf
)
1403 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1404 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1407 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1408 hostdata
->madapter_info
.srp_version
);
1412 static struct class_device_attribute ibmvscsi_host_srp_version
= {
1414 .name
= "srp_version",
1417 .show
= show_host_srp_version
,
1420 static ssize_t
show_host_partition_name(struct class_device
*class_dev
,
1423 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1424 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1427 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1428 hostdata
->madapter_info
.partition_name
);
1432 static struct class_device_attribute ibmvscsi_host_partition_name
= {
1434 .name
= "partition_name",
1437 .show
= show_host_partition_name
,
1440 static ssize_t
show_host_partition_number(struct class_device
*class_dev
,
1443 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1444 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1447 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1448 hostdata
->madapter_info
.partition_number
);
1452 static struct class_device_attribute ibmvscsi_host_partition_number
= {
1454 .name
= "partition_number",
1457 .show
= show_host_partition_number
,
1460 static ssize_t
show_host_mad_version(struct class_device
*class_dev
, char *buf
)
1462 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1463 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1466 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1467 hostdata
->madapter_info
.mad_version
);
1471 static struct class_device_attribute ibmvscsi_host_mad_version
= {
1473 .name
= "mad_version",
1476 .show
= show_host_mad_version
,
1479 static ssize_t
show_host_os_type(struct class_device
*class_dev
, char *buf
)
1481 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1482 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1485 len
= snprintf(buf
, PAGE_SIZE
, "%d\n", hostdata
->madapter_info
.os_type
);
1489 static struct class_device_attribute ibmvscsi_host_os_type
= {
1494 .show
= show_host_os_type
,
1497 static ssize_t
show_host_config(struct class_device
*class_dev
, char *buf
)
1499 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1500 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1502 /* returns null-terminated host config data */
1503 if (ibmvscsi_do_host_config(hostdata
, buf
, PAGE_SIZE
) == 0)
1509 static struct class_device_attribute ibmvscsi_host_config
= {
1514 .show
= show_host_config
,
1517 static struct class_device_attribute
*ibmvscsi_attrs
[] = {
1518 &ibmvscsi_host_srp_version
,
1519 &ibmvscsi_host_partition_name
,
1520 &ibmvscsi_host_partition_number
,
1521 &ibmvscsi_host_mad_version
,
1522 &ibmvscsi_host_os_type
,
1523 &ibmvscsi_host_config
,
1527 /* ------------------------------------------------------------
1528 * SCSI driver registration
1530 static struct scsi_host_template driver_template
= {
1531 .module
= THIS_MODULE
,
1532 .name
= "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION
,
1533 .proc_name
= "ibmvscsi",
1534 .queuecommand
= ibmvscsi_queuecommand
,
1535 .eh_abort_handler
= ibmvscsi_eh_abort_handler
,
1536 .eh_device_reset_handler
= ibmvscsi_eh_device_reset_handler
,
1537 .eh_host_reset_handler
= ibmvscsi_eh_host_reset_handler
,
1538 .slave_configure
= ibmvscsi_slave_configure
,
1539 .change_queue_depth
= ibmvscsi_change_queue_depth
,
1541 .can_queue
= IBMVSCSI_MAX_REQUESTS_DEFAULT
,
1543 .sg_tablesize
= SG_ALL
,
1544 .use_clustering
= ENABLE_CLUSTERING
,
1545 .shost_attrs
= ibmvscsi_attrs
,
1549 * Called by bus code for each adapter
1551 static int ibmvscsi_probe(struct vio_dev
*vdev
, const struct vio_device_id
*id
)
1553 struct ibmvscsi_host_data
*hostdata
;
1554 struct Scsi_Host
*host
;
1555 struct device
*dev
= &vdev
->dev
;
1556 unsigned long wait_switch
= 0;
1559 vdev
->dev
.driver_data
= NULL
;
1561 driver_template
.can_queue
= max_requests
;
1562 host
= scsi_host_alloc(&driver_template
, sizeof(*hostdata
));
1564 dev_err(&vdev
->dev
, "couldn't allocate host data\n");
1565 goto scsi_host_alloc_failed
;
1568 hostdata
= shost_priv(host
);
1569 memset(hostdata
, 0x00, sizeof(*hostdata
));
1570 INIT_LIST_HEAD(&hostdata
->sent
);
1571 hostdata
->host
= host
;
1572 hostdata
->dev
= dev
;
1573 atomic_set(&hostdata
->request_limit
, -1);
1574 hostdata
->host
->max_sectors
= 32 * 8; /* default max I/O 32 pages */
1576 rc
= ibmvscsi_init_crq_queue(&hostdata
->queue
, hostdata
, max_requests
);
1577 if (rc
!= 0 && rc
!= H_RESOURCE
) {
1578 dev_err(&vdev
->dev
, "couldn't initialize crq. rc=%d\n", rc
);
1579 goto init_crq_failed
;
1581 if (initialize_event_pool(&hostdata
->pool
, max_requests
, hostdata
) != 0) {
1582 dev_err(&vdev
->dev
, "couldn't initialize event pool\n");
1583 goto init_pool_failed
;
1587 host
->max_id
= max_id
;
1588 host
->max_channel
= max_channel
;
1590 if (scsi_add_host(hostdata
->host
, hostdata
->dev
))
1591 goto add_host_failed
;
1593 /* Try to send an initialization message. Note that this is allowed
1594 * to fail if the other end is not acive. In that case we don't
1597 if (ibmvscsi_send_crq(hostdata
, 0xC001000000000000LL
, 0) == 0
1598 || rc
== H_RESOURCE
) {
1600 * Wait around max init_timeout secs for the adapter to finish
1601 * initializing. When we are done initializing, we will have a
1602 * valid request_limit. We don't want Linux scanning before
1605 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1606 time_before(jiffies
, wait_switch
) &&
1607 atomic_read(&hostdata
->request_limit
) < 2;) {
1612 /* if we now have a valid request_limit, initiate a scan */
1613 if (atomic_read(&hostdata
->request_limit
) > 0)
1614 scsi_scan_host(host
);
1617 vdev
->dev
.driver_data
= hostdata
;
1621 release_event_pool(&hostdata
->pool
, hostdata
);
1623 ibmvscsi_release_crq_queue(&hostdata
->queue
, hostdata
, max_requests
);
1625 scsi_host_put(host
);
1626 scsi_host_alloc_failed
:
1630 static int ibmvscsi_remove(struct vio_dev
*vdev
)
1632 struct ibmvscsi_host_data
*hostdata
= vdev
->dev
.driver_data
;
1633 release_event_pool(&hostdata
->pool
, hostdata
);
1634 ibmvscsi_release_crq_queue(&hostdata
->queue
, hostdata
,
1637 scsi_remove_host(hostdata
->host
);
1638 scsi_host_put(hostdata
->host
);
1644 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1647 static struct vio_device_id ibmvscsi_device_table
[] __devinitdata
= {
1648 {"vscsi", "IBM,v-scsi"},
1651 MODULE_DEVICE_TABLE(vio
, ibmvscsi_device_table
);
1653 static struct vio_driver ibmvscsi_driver
= {
1654 .id_table
= ibmvscsi_device_table
,
1655 .probe
= ibmvscsi_probe
,
1656 .remove
= ibmvscsi_remove
,
1659 .owner
= THIS_MODULE
,
1663 int __init
ibmvscsi_module_init(void)
1665 return vio_register_driver(&ibmvscsi_driver
);
1668 void __exit
ibmvscsi_module_exit(void)
1670 vio_unregister_driver(&ibmvscsi_driver
);
1673 module_init(ibmvscsi_module_init
);
1674 module_exit(ibmvscsi_module_exit
);