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)
396 else if (sg_mapped
> SG_ALL
) {
398 "ibmvscsi: More than %d mapped sg entries, got %d\n",
403 set_srp_direction(cmd
, srp_cmd
, sg_mapped
);
405 /* special case; we can use a single direct descriptor */
406 if (sg_mapped
== 1) {
407 map_sg_list(cmd
, sg_mapped
, data
);
411 indirect
->table_desc
.va
= 0;
412 indirect
->table_desc
.len
= sg_mapped
* sizeof(struct srp_direct_buf
);
413 indirect
->table_desc
.key
= 0;
415 if (sg_mapped
<= MAX_INDIRECT_BUFS
) {
416 total_length
= map_sg_list(cmd
, sg_mapped
,
417 &indirect
->desc_list
[0]);
418 indirect
->len
= total_length
;
422 /* get indirect table */
423 if (!evt_struct
->ext_list
) {
424 evt_struct
->ext_list
= (struct srp_direct_buf
*)
425 dma_alloc_coherent(dev
,
426 SG_ALL
* sizeof(struct srp_direct_buf
),
427 &evt_struct
->ext_list_token
, 0);
428 if (!evt_struct
->ext_list
) {
429 sdev_printk(KERN_ERR
, cmd
->device
,
430 "Can't allocate memory for indirect table\n");
435 total_length
= map_sg_list(cmd
, sg_mapped
, evt_struct
->ext_list
);
437 indirect
->len
= total_length
;
438 indirect
->table_desc
.va
= evt_struct
->ext_list_token
;
439 indirect
->table_desc
.len
= sg_mapped
* sizeof(indirect
->desc_list
[0]);
440 memcpy(indirect
->desc_list
, evt_struct
->ext_list
,
441 MAX_INDIRECT_BUFS
* sizeof(struct srp_direct_buf
));
446 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
447 * @cmd: struct scsi_cmnd with the memory to be mapped
448 * @srp_cmd: srp_cmd that contains the memory descriptor
449 * @dev: dma device for which to map dma memory
451 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
452 * Returns 1 on success.
454 static int map_data_for_srp_cmd(struct scsi_cmnd
*cmd
,
455 struct srp_event_struct
*evt_struct
,
456 struct srp_cmd
*srp_cmd
, struct device
*dev
)
458 switch (cmd
->sc_data_direction
) {
459 case DMA_FROM_DEVICE
:
464 case DMA_BIDIRECTIONAL
:
465 sdev_printk(KERN_ERR
, cmd
->device
,
466 "Can't map DMA_BIDIRECTIONAL to read/write\n");
469 sdev_printk(KERN_ERR
, cmd
->device
,
470 "Unknown data direction 0x%02x; can't map!\n",
471 cmd
->sc_data_direction
);
475 return map_sg_data(cmd
, evt_struct
, srp_cmd
, dev
);
479 * purge_requests: Our virtual adapter just shut down. purge any sent requests
480 * @hostdata: the adapter
482 static void purge_requests(struct ibmvscsi_host_data
*hostdata
, int error_code
)
484 struct srp_event_struct
*tmp_evt
, *pos
;
487 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
488 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
489 list_del(&tmp_evt
->list
);
490 del_timer(&tmp_evt
->timer
);
492 tmp_evt
->cmnd
->result
= (error_code
<< 16);
493 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
,
495 tmp_evt
->hostdata
->dev
);
496 if (tmp_evt
->cmnd_done
)
497 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
498 } else if (tmp_evt
->done
)
499 tmp_evt
->done(tmp_evt
);
500 free_event_struct(&tmp_evt
->hostdata
->pool
, tmp_evt
);
502 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
506 * ibmvscsi_reset_host - Reset the connection to the server
507 * @hostdata: struct ibmvscsi_host_data to reset
509 static void ibmvscsi_reset_host(struct ibmvscsi_host_data
*hostdata
)
511 scsi_block_requests(hostdata
->host
);
512 atomic_set(&hostdata
->request_limit
, 0);
514 purge_requests(hostdata
, DID_ERROR
);
515 if ((ibmvscsi_reset_crq_queue(&hostdata
->queue
, hostdata
)) ||
516 (ibmvscsi_send_crq(hostdata
, 0xC001000000000000LL
, 0)) ||
517 (vio_enable_interrupts(to_vio_dev(hostdata
->dev
)))) {
518 atomic_set(&hostdata
->request_limit
, -1);
519 dev_err(hostdata
->dev
, "error after reset\n");
522 scsi_unblock_requests(hostdata
->host
);
526 * ibmvscsi_timeout - Internal command timeout handler
527 * @evt_struct: struct srp_event_struct that timed out
529 * Called when an internally generated command times out
531 static void ibmvscsi_timeout(struct srp_event_struct
*evt_struct
)
533 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
535 dev_err(hostdata
->dev
, "Command timed out (%x). Resetting connection\n",
536 evt_struct
->iu
.srp
.cmd
.opcode
);
538 ibmvscsi_reset_host(hostdata
);
542 /* ------------------------------------------------------------
543 * Routines for sending and receiving SRPs
546 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
547 * @evt_struct: evt_struct to be sent
548 * @hostdata: ibmvscsi_host_data of host
549 * @timeout: timeout in seconds - 0 means do not time command
551 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
552 * Note that this routine assumes that host_lock is held for synchronization
554 static int ibmvscsi_send_srp_event(struct srp_event_struct
*evt_struct
,
555 struct ibmvscsi_host_data
*hostdata
,
556 unsigned long timeout
)
558 u64
*crq_as_u64
= (u64
*) &evt_struct
->crq
;
562 /* If we have exhausted our request limit, just fail this request,
563 * unless it is for a reset or abort.
564 * Note that there are rare cases involving driver generated requests
565 * (such as task management requests) that the mid layer may think we
566 * can handle more requests (can_queue) when we actually can't
568 if (evt_struct
->crq
.format
== VIOSRP_SRP_FORMAT
) {
570 atomic_dec_if_positive(&hostdata
->request_limit
);
571 /* If request limit was -1 when we started, it is now even
574 if (request_status
< -1)
576 /* Otherwise, we may have run out of requests. */
577 /* Abort and reset calls should make it through.
578 * Nothing except abort and reset should use the last two
579 * slots unless we had two or less to begin with.
581 else if (request_status
< 2 &&
582 evt_struct
->iu
.srp
.cmd
.opcode
!= SRP_TSK_MGMT
) {
583 /* In the case that we have less than two requests
584 * available, check the server limit as a combination
585 * of the request limit and the number of requests
586 * in-flight (the size of the send list). If the
587 * server limit is greater than 2, return busy so
588 * that the last two are reserved for reset and abort.
590 int server_limit
= request_status
;
591 struct srp_event_struct
*tmp_evt
;
593 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
597 if (server_limit
> 2)
602 /* Copy the IU into the transfer area */
603 *evt_struct
->xfer_iu
= evt_struct
->iu
;
604 evt_struct
->xfer_iu
->srp
.rsp
.tag
= (u64
)evt_struct
;
606 /* Add this to the sent list. We need to do this
607 * before we actually send
608 * in case it comes back REALLY fast
610 list_add_tail(&evt_struct
->list
, &hostdata
->sent
);
612 init_timer(&evt_struct
->timer
);
614 evt_struct
->timer
.data
= (unsigned long) evt_struct
;
615 evt_struct
->timer
.expires
= jiffies
+ (timeout
* HZ
);
616 evt_struct
->timer
.function
= (void (*)(unsigned long))ibmvscsi_timeout
;
617 add_timer(&evt_struct
->timer
);
621 ibmvscsi_send_crq(hostdata
, crq_as_u64
[0], crq_as_u64
[1])) != 0) {
622 list_del(&evt_struct
->list
);
623 del_timer(&evt_struct
->timer
);
625 dev_err(hostdata
->dev
, "send error %d\n", rc
);
626 atomic_inc(&hostdata
->request_limit
);
633 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
635 free_event_struct(&hostdata
->pool
, evt_struct
);
636 atomic_inc(&hostdata
->request_limit
);
637 return SCSI_MLQUEUE_HOST_BUSY
;
640 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
642 if (evt_struct
->cmnd
!= NULL
) {
643 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
644 evt_struct
->cmnd_done(evt_struct
->cmnd
);
645 } else if (evt_struct
->done
)
646 evt_struct
->done(evt_struct
);
648 free_event_struct(&hostdata
->pool
, evt_struct
);
653 * handle_cmd_rsp: - Handle responses from commands
654 * @evt_struct: srp_event_struct to be handled
656 * Used as a callback by when sending scsi cmds.
657 * Gets called by ibmvscsi_handle_crq()
659 static void handle_cmd_rsp(struct srp_event_struct
*evt_struct
)
661 struct srp_rsp
*rsp
= &evt_struct
->xfer_iu
->srp
.rsp
;
662 struct scsi_cmnd
*cmnd
= evt_struct
->cmnd
;
664 if (unlikely(rsp
->opcode
!= SRP_RSP
)) {
665 if (printk_ratelimit())
666 dev_warn(evt_struct
->hostdata
->dev
,
667 "bad SRP RSP type %d\n", rsp
->opcode
);
671 cmnd
->result
= rsp
->status
;
672 if (((cmnd
->result
>> 1) & 0x1f) == CHECK_CONDITION
)
673 memcpy(cmnd
->sense_buffer
,
675 rsp
->sense_data_len
);
676 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
,
678 evt_struct
->hostdata
->dev
);
680 if (rsp
->flags
& SRP_RSP_FLAG_DOOVER
)
681 scsi_set_resid(cmnd
, rsp
->data_out_res_cnt
);
682 else if (rsp
->flags
& SRP_RSP_FLAG_DIOVER
)
683 scsi_set_resid(cmnd
, rsp
->data_in_res_cnt
);
686 if (evt_struct
->cmnd_done
)
687 evt_struct
->cmnd_done(cmnd
);
691 * lun_from_dev: - Returns the lun of the scsi device
692 * @dev: struct scsi_device
695 static inline u16
lun_from_dev(struct scsi_device
*dev
)
697 return (0x2 << 14) | (dev
->id
<< 8) | (dev
->channel
<< 5) | dev
->lun
;
701 * ibmvscsi_queue: - The queuecommand function of the scsi template
702 * @cmd: struct scsi_cmnd to be executed
703 * @done: Callback function to be called when cmd is completed
705 static int ibmvscsi_queuecommand(struct scsi_cmnd
*cmnd
,
706 void (*done
) (struct scsi_cmnd
*))
708 struct srp_cmd
*srp_cmd
;
709 struct srp_event_struct
*evt_struct
;
710 struct srp_indirect_buf
*indirect
;
711 struct ibmvscsi_host_data
*hostdata
=
712 (struct ibmvscsi_host_data
*)&cmnd
->device
->host
->hostdata
;
713 u16 lun
= lun_from_dev(cmnd
->device
);
716 evt_struct
= get_event_struct(&hostdata
->pool
);
718 return SCSI_MLQUEUE_HOST_BUSY
;
720 /* Set up the actual SRP IU */
721 srp_cmd
= &evt_struct
->iu
.srp
.cmd
;
722 memset(srp_cmd
, 0x00, SRP_MAX_IU_LEN
);
723 srp_cmd
->opcode
= SRP_CMD
;
724 memcpy(srp_cmd
->cdb
, cmnd
->cmnd
, sizeof(cmnd
->cmnd
));
725 srp_cmd
->lun
= ((u64
) lun
) << 48;
727 if (!map_data_for_srp_cmd(cmnd
, evt_struct
, srp_cmd
, hostdata
->dev
)) {
728 sdev_printk(KERN_ERR
, cmnd
->device
, "couldn't convert cmd to srp_cmd\n");
729 free_event_struct(&hostdata
->pool
, evt_struct
);
730 return SCSI_MLQUEUE_HOST_BUSY
;
733 init_event_struct(evt_struct
,
736 cmnd
->timeout_per_command
/HZ
);
738 evt_struct
->cmnd
= cmnd
;
739 evt_struct
->cmnd_done
= done
;
741 /* Fix up dma address of the buffer itself */
742 indirect
= (struct srp_indirect_buf
*) srp_cmd
->add_data
;
743 out_fmt
= srp_cmd
->buf_fmt
>> 4;
744 in_fmt
= srp_cmd
->buf_fmt
& ((1U << 4) - 1);
745 if ((in_fmt
== SRP_DATA_DESC_INDIRECT
||
746 out_fmt
== SRP_DATA_DESC_INDIRECT
) &&
747 indirect
->table_desc
.va
== 0) {
748 indirect
->table_desc
.va
= evt_struct
->crq
.IU_data_ptr
+
749 offsetof(struct srp_cmd
, add_data
) +
750 offsetof(struct srp_indirect_buf
, desc_list
);
753 return ibmvscsi_send_srp_event(evt_struct
, hostdata
, 0);
756 /* ------------------------------------------------------------
757 * Routines for driver initialization
760 * adapter_info_rsp: - Handle response to MAD adapter info request
761 * @evt_struct: srp_event_struct with the response
763 * Used as a "done" callback by when sending adapter_info. Gets called
764 * by ibmvscsi_handle_crq()
766 static void adapter_info_rsp(struct srp_event_struct
*evt_struct
)
768 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
769 dma_unmap_single(hostdata
->dev
,
770 evt_struct
->iu
.mad
.adapter_info
.buffer
,
771 evt_struct
->iu
.mad
.adapter_info
.common
.length
,
774 if (evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
) {
775 dev_err(hostdata
->dev
, "error %d getting adapter info\n",
776 evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
);
778 dev_info(hostdata
->dev
, "host srp version: %s, "
779 "host partition %s (%d), OS %d, max io %u\n",
780 hostdata
->madapter_info
.srp_version
,
781 hostdata
->madapter_info
.partition_name
,
782 hostdata
->madapter_info
.partition_number
,
783 hostdata
->madapter_info
.os_type
,
784 hostdata
->madapter_info
.port_max_txu
[0]);
786 if (hostdata
->madapter_info
.port_max_txu
[0])
787 hostdata
->host
->max_sectors
=
788 hostdata
->madapter_info
.port_max_txu
[0] >> 9;
790 if (hostdata
->madapter_info
.os_type
== 3 &&
791 strcmp(hostdata
->madapter_info
.srp_version
, "1.6a") <= 0) {
792 dev_err(hostdata
->dev
, "host (Ver. %s) doesn't support large transfers\n",
793 hostdata
->madapter_info
.srp_version
);
794 dev_err(hostdata
->dev
, "limiting scatterlists to %d\n",
796 hostdata
->host
->sg_tablesize
= MAX_INDIRECT_BUFS
;
802 * send_mad_adapter_info: - Sends the mad adapter info request
803 * and stores the result so it can be retrieved with
804 * sysfs. We COULD consider causing a failure if the
805 * returned SRP version doesn't match ours.
806 * @hostdata: ibmvscsi_host_data of host
808 * Returns zero if successful.
810 static void send_mad_adapter_info(struct ibmvscsi_host_data
*hostdata
)
812 struct viosrp_adapter_info
*req
;
813 struct srp_event_struct
*evt_struct
;
817 evt_struct
= get_event_struct(&hostdata
->pool
);
819 dev_err(hostdata
->dev
,
820 "couldn't allocate an event for ADAPTER_INFO_REQ!\n");
824 init_event_struct(evt_struct
,
829 req
= &evt_struct
->iu
.mad
.adapter_info
;
830 memset(req
, 0x00, sizeof(*req
));
832 req
->common
.type
= VIOSRP_ADAPTER_INFO_TYPE
;
833 req
->common
.length
= sizeof(hostdata
->madapter_info
);
834 req
->buffer
= addr
= dma_map_single(hostdata
->dev
,
835 &hostdata
->madapter_info
,
836 sizeof(hostdata
->madapter_info
),
839 if (dma_mapping_error(req
->buffer
)) {
840 dev_err(hostdata
->dev
, "Unable to map request_buffer for adapter_info!\n");
841 free_event_struct(&hostdata
->pool
, evt_struct
);
845 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
846 if (ibmvscsi_send_srp_event(evt_struct
, hostdata
, init_timeout
* 2)) {
847 dev_err(hostdata
->dev
, "couldn't send ADAPTER_INFO_REQ!\n");
848 dma_unmap_single(hostdata
->dev
,
850 sizeof(hostdata
->madapter_info
),
853 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
857 * login_rsp: - Handle response to SRP login request
858 * @evt_struct: srp_event_struct with the response
860 * Used as a "done" callback by when sending srp_login. Gets called
861 * by ibmvscsi_handle_crq()
863 static void login_rsp(struct srp_event_struct
*evt_struct
)
865 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
866 switch (evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
) {
867 case SRP_LOGIN_RSP
: /* it worked! */
869 case SRP_LOGIN_REJ
: /* refused! */
870 dev_info(hostdata
->dev
, "SRP_LOGIN_REJ reason %u\n",
871 evt_struct
->xfer_iu
->srp
.login_rej
.reason
);
873 atomic_set(&hostdata
->request_limit
, -1);
876 dev_err(hostdata
->dev
, "Invalid login response typecode 0x%02x!\n",
877 evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
);
879 atomic_set(&hostdata
->request_limit
, -1);
883 dev_info(hostdata
->dev
, "SRP_LOGIN succeeded\n");
885 if (evt_struct
->xfer_iu
->srp
.login_rsp
.req_lim_delta
< 0)
886 dev_err(hostdata
->dev
, "Invalid request_limit.\n");
888 /* Now we know what the real request-limit is.
889 * This value is set rather than added to request_limit because
890 * request_limit could have been set to -1 by this client.
892 atomic_set(&hostdata
->request_limit
,
893 evt_struct
->xfer_iu
->srp
.login_rsp
.req_lim_delta
);
895 /* If we had any pending I/Os, kick them */
896 scsi_unblock_requests(hostdata
->host
);
898 send_mad_adapter_info(hostdata
);
903 * send_srp_login: - Sends the srp login
904 * @hostdata: ibmvscsi_host_data of host
906 * Returns zero if successful.
908 static int send_srp_login(struct ibmvscsi_host_data
*hostdata
)
912 struct srp_login_req
*login
;
913 struct srp_event_struct
*evt_struct
= get_event_struct(&hostdata
->pool
);
915 dev_err(hostdata
->dev
, "couldn't allocate an event for login req!\n");
919 init_event_struct(evt_struct
,
924 login
= &evt_struct
->iu
.srp
.login_req
;
925 memset(login
, 0x00, sizeof(struct srp_login_req
));
926 login
->opcode
= SRP_LOGIN_REQ
;
927 login
->req_it_iu_len
= sizeof(union srp_iu
);
928 login
->req_buf_fmt
= SRP_BUF_FORMAT_DIRECT
| SRP_BUF_FORMAT_INDIRECT
;
930 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
931 /* Start out with a request limit of 1, since this is negotiated in
932 * the login request we are just sending
934 atomic_set(&hostdata
->request_limit
, 1);
936 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, init_timeout
* 2);
937 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
938 dev_info(hostdata
->dev
, "sent SRP login\n");
943 * sync_completion: Signal that a synchronous command has completed
944 * Note that after returning from this call, the evt_struct is freed.
945 * the caller waiting on this completion shouldn't touch the evt_struct
948 static void sync_completion(struct srp_event_struct
*evt_struct
)
950 /* copy the response back */
951 if (evt_struct
->sync_srp
)
952 *evt_struct
->sync_srp
= *evt_struct
->xfer_iu
;
954 complete(&evt_struct
->comp
);
958 * ibmvscsi_abort: Abort a command...from scsi host template
959 * send this over to the server and wait synchronously for the response
961 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd
*cmd
)
963 struct ibmvscsi_host_data
*hostdata
=
964 (struct ibmvscsi_host_data
*)cmd
->device
->host
->hostdata
;
965 struct srp_tsk_mgmt
*tsk_mgmt
;
966 struct srp_event_struct
*evt
;
967 struct srp_event_struct
*tmp_evt
, *found_evt
;
968 union viosrp_iu srp_rsp
;
971 u16 lun
= lun_from_dev(cmd
->device
);
973 /* First, find this command in our sent list so we can figure
974 * out the correct tag
976 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
978 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
979 if (tmp_evt
->cmnd
== cmd
) {
986 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
990 evt
= get_event_struct(&hostdata
->pool
);
992 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
993 sdev_printk(KERN_ERR
, cmd
->device
, "failed to allocate abort event\n");
997 init_event_struct(evt
,
1002 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1004 /* Set up an abort SRP command */
1005 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1006 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1007 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1008 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_ABORT_TASK
;
1009 tsk_mgmt
->task_tag
= (u64
) found_evt
;
1011 sdev_printk(KERN_INFO
, cmd
->device
, "aborting command. lun 0x%lx, tag 0x%lx\n",
1012 tsk_mgmt
->lun
, tsk_mgmt
->task_tag
);
1014 evt
->sync_srp
= &srp_rsp
;
1015 init_completion(&evt
->comp
);
1016 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, init_timeout
* 2);
1017 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1019 sdev_printk(KERN_ERR
, cmd
->device
,
1020 "failed to send abort() event. rc=%d\n", rsp_rc
);
1024 wait_for_completion(&evt
->comp
);
1026 /* make sure we got a good response */
1027 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1028 if (printk_ratelimit())
1029 sdev_printk(KERN_WARNING
, cmd
->device
, "abort bad SRP RSP type %d\n",
1030 srp_rsp
.srp
.rsp
.opcode
);
1034 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1035 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1037 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1040 if (printk_ratelimit())
1041 sdev_printk(KERN_WARNING
, cmd
->device
,
1042 "abort code %d for task tag 0x%lx\n",
1043 rsp_rc
, tsk_mgmt
->task_tag
);
1047 /* Because we dropped the spinlock above, it's possible
1048 * The event is no longer in our list. Make sure it didn't
1049 * complete while we were aborting
1051 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1053 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1054 if (tmp_evt
->cmnd
== cmd
) {
1055 found_evt
= tmp_evt
;
1060 if (found_evt
== NULL
) {
1061 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1062 sdev_printk(KERN_INFO
, cmd
->device
, "aborted task tag 0x%lx completed\n",
1063 tsk_mgmt
->task_tag
);
1067 sdev_printk(KERN_INFO
, cmd
->device
, "successfully aborted task tag 0x%lx\n",
1068 tsk_mgmt
->task_tag
);
1070 cmd
->result
= (DID_ABORT
<< 16);
1071 list_del(&found_evt
->list
);
1072 unmap_cmd_data(&found_evt
->iu
.srp
.cmd
, found_evt
,
1073 found_evt
->hostdata
->dev
);
1074 free_event_struct(&found_evt
->hostdata
->pool
, found_evt
);
1075 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1076 atomic_inc(&hostdata
->request_limit
);
1081 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1082 * template send this over to the server and wait synchronously for the
1085 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd
*cmd
)
1087 struct ibmvscsi_host_data
*hostdata
=
1088 (struct ibmvscsi_host_data
*)cmd
->device
->host
->hostdata
;
1090 struct srp_tsk_mgmt
*tsk_mgmt
;
1091 struct srp_event_struct
*evt
;
1092 struct srp_event_struct
*tmp_evt
, *pos
;
1093 union viosrp_iu srp_rsp
;
1095 unsigned long flags
;
1096 u16 lun
= lun_from_dev(cmd
->device
);
1098 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1099 evt
= get_event_struct(&hostdata
->pool
);
1101 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1102 sdev_printk(KERN_ERR
, cmd
->device
, "failed to allocate reset event\n");
1106 init_event_struct(evt
,
1111 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1113 /* Set up a lun reset SRP command */
1114 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1115 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1116 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1117 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_LUN_RESET
;
1119 sdev_printk(KERN_INFO
, cmd
->device
, "resetting device. lun 0x%lx\n",
1122 evt
->sync_srp
= &srp_rsp
;
1123 init_completion(&evt
->comp
);
1124 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, init_timeout
* 2);
1125 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1127 sdev_printk(KERN_ERR
, cmd
->device
,
1128 "failed to send reset event. rc=%d\n", rsp_rc
);
1132 wait_for_completion(&evt
->comp
);
1134 /* make sure we got a good response */
1135 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1136 if (printk_ratelimit())
1137 sdev_printk(KERN_WARNING
, cmd
->device
, "reset bad SRP RSP type %d\n",
1138 srp_rsp
.srp
.rsp
.opcode
);
1142 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1143 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1145 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1148 if (printk_ratelimit())
1149 sdev_printk(KERN_WARNING
, cmd
->device
,
1150 "reset code %d for task tag 0x%lx\n",
1151 rsp_rc
, tsk_mgmt
->task_tag
);
1155 /* We need to find all commands for this LUN that have not yet been
1156 * responded to, and fail them with DID_RESET
1158 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1159 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
1160 if ((tmp_evt
->cmnd
) && (tmp_evt
->cmnd
->device
== cmd
->device
)) {
1162 tmp_evt
->cmnd
->result
= (DID_RESET
<< 16);
1163 list_del(&tmp_evt
->list
);
1164 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
, tmp_evt
,
1165 tmp_evt
->hostdata
->dev
);
1166 free_event_struct(&tmp_evt
->hostdata
->pool
,
1168 atomic_inc(&hostdata
->request_limit
);
1169 if (tmp_evt
->cmnd_done
)
1170 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
1171 else if (tmp_evt
->done
)
1172 tmp_evt
->done(tmp_evt
);
1175 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1180 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1181 * @cmd: struct scsi_cmnd having problems
1183 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd
*cmd
)
1185 unsigned long wait_switch
= 0;
1186 struct ibmvscsi_host_data
*hostdata
=
1187 (struct ibmvscsi_host_data
*)cmd
->device
->host
->hostdata
;
1189 dev_err(hostdata
->dev
, "Resetting connection due to error recovery\n");
1191 ibmvscsi_reset_host(hostdata
);
1193 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1194 time_before(jiffies
, wait_switch
) &&
1195 atomic_read(&hostdata
->request_limit
) < 2;) {
1200 if (atomic_read(&hostdata
->request_limit
) <= 0)
1207 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1208 * @crq: Command/Response queue
1209 * @hostdata: ibmvscsi_host_data of host
1212 void ibmvscsi_handle_crq(struct viosrp_crq
*crq
,
1213 struct ibmvscsi_host_data
*hostdata
)
1216 unsigned long flags
;
1217 struct srp_event_struct
*evt_struct
=
1218 (struct srp_event_struct
*)crq
->IU_data_ptr
;
1219 switch (crq
->valid
) {
1220 case 0xC0: /* initialization */
1221 switch (crq
->format
) {
1222 case 0x01: /* Initialization message */
1223 dev_info(hostdata
->dev
, "partner initialized\n");
1224 /* Send back a response */
1225 if ((rc
= ibmvscsi_send_crq(hostdata
,
1226 0xC002000000000000LL
, 0)) == 0) {
1228 send_srp_login(hostdata
);
1230 dev_err(hostdata
->dev
, "Unable to send init rsp. rc=%ld\n", rc
);
1234 case 0x02: /* Initialization response */
1235 dev_info(hostdata
->dev
, "partner initialization complete\n");
1238 send_srp_login(hostdata
);
1241 dev_err(hostdata
->dev
, "unknown crq message type: %d\n", crq
->format
);
1244 case 0xFF: /* Hypervisor telling us the connection is closed */
1245 scsi_block_requests(hostdata
->host
);
1246 atomic_set(&hostdata
->request_limit
, 0);
1247 if (crq
->format
== 0x06) {
1248 /* We need to re-setup the interpartition connection */
1249 dev_info(hostdata
->dev
, "Re-enabling adapter!\n");
1250 purge_requests(hostdata
, DID_REQUEUE
);
1251 if ((ibmvscsi_reenable_crq_queue(&hostdata
->queue
,
1253 (ibmvscsi_send_crq(hostdata
,
1254 0xC001000000000000LL
, 0))) {
1255 atomic_set(&hostdata
->request_limit
,
1257 dev_err(hostdata
->dev
, "error after enable\n");
1260 dev_err(hostdata
->dev
, "Virtual adapter failed rc %d!\n",
1263 purge_requests(hostdata
, DID_ERROR
);
1264 if ((ibmvscsi_reset_crq_queue(&hostdata
->queue
,
1266 (ibmvscsi_send_crq(hostdata
,
1267 0xC001000000000000LL
, 0))) {
1268 atomic_set(&hostdata
->request_limit
,
1270 dev_err(hostdata
->dev
, "error after reset\n");
1273 scsi_unblock_requests(hostdata
->host
);
1275 case 0x80: /* real payload */
1278 dev_err(hostdata
->dev
, "got an invalid message type 0x%02x\n",
1283 /* The only kind of payload CRQs we should get are responses to
1284 * things we send. Make sure this response is to something we
1287 if (!valid_event_struct(&hostdata
->pool
, evt_struct
)) {
1288 dev_err(hostdata
->dev
, "returned correlation_token 0x%p is invalid!\n",
1289 (void *)crq
->IU_data_ptr
);
1293 if (atomic_read(&evt_struct
->free
)) {
1294 dev_err(hostdata
->dev
, "received duplicate correlation_token 0x%p!\n",
1295 (void *)crq
->IU_data_ptr
);
1299 if (crq
->format
== VIOSRP_SRP_FORMAT
)
1300 atomic_add(evt_struct
->xfer_iu
->srp
.rsp
.req_lim_delta
,
1301 &hostdata
->request_limit
);
1303 del_timer(&evt_struct
->timer
);
1305 if (evt_struct
->done
)
1306 evt_struct
->done(evt_struct
);
1308 dev_err(hostdata
->dev
, "returned done() is NULL; not running it!\n");
1311 * Lock the host_lock before messing with these structures, since we
1312 * are running in a task context
1314 spin_lock_irqsave(evt_struct
->hostdata
->host
->host_lock
, flags
);
1315 list_del(&evt_struct
->list
);
1316 free_event_struct(&evt_struct
->hostdata
->pool
, evt_struct
);
1317 spin_unlock_irqrestore(evt_struct
->hostdata
->host
->host_lock
, flags
);
1321 * ibmvscsi_get_host_config: Send the command to the server to get host
1322 * configuration data. The data is opaque to us.
1324 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data
*hostdata
,
1325 unsigned char *buffer
, int length
)
1327 struct viosrp_host_config
*host_config
;
1328 struct srp_event_struct
*evt_struct
;
1329 unsigned long flags
;
1333 evt_struct
= get_event_struct(&hostdata
->pool
);
1335 dev_err(hostdata
->dev
, "couldn't allocate event for HOST_CONFIG!\n");
1339 init_event_struct(evt_struct
,
1344 host_config
= &evt_struct
->iu
.mad
.host_config
;
1346 /* Set up a lun reset SRP command */
1347 memset(host_config
, 0x00, sizeof(*host_config
));
1348 host_config
->common
.type
= VIOSRP_HOST_CONFIG_TYPE
;
1349 host_config
->common
.length
= length
;
1350 host_config
->buffer
= addr
= dma_map_single(hostdata
->dev
, buffer
,
1354 if (dma_mapping_error(host_config
->buffer
)) {
1355 dev_err(hostdata
->dev
, "dma_mapping error getting host config\n");
1356 free_event_struct(&hostdata
->pool
, evt_struct
);
1360 init_completion(&evt_struct
->comp
);
1361 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1362 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, init_timeout
* 2);
1363 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1365 wait_for_completion(&evt_struct
->comp
);
1366 dma_unmap_single(hostdata
->dev
, addr
, length
, DMA_BIDIRECTIONAL
);
1372 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1373 * @sdev: struct scsi_device device to configure
1375 * Enable allow_restart for a device if it is a disk. Adjust the
1376 * queue_depth here also as is required by the documentation for
1377 * struct scsi_host_template.
1379 static int ibmvscsi_slave_configure(struct scsi_device
*sdev
)
1381 struct Scsi_Host
*shost
= sdev
->host
;
1382 unsigned long lock_flags
= 0;
1384 spin_lock_irqsave(shost
->host_lock
, lock_flags
);
1385 if (sdev
->type
== TYPE_DISK
)
1386 sdev
->allow_restart
= 1;
1387 scsi_adjust_queue_depth(sdev
, 0, shost
->cmd_per_lun
);
1388 spin_unlock_irqrestore(shost
->host_lock
, lock_flags
);
1393 * ibmvscsi_change_queue_depth - Change the device's queue depth
1394 * @sdev: scsi device struct
1395 * @qdepth: depth to set
1400 static int ibmvscsi_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
1402 if (qdepth
> IBMVSCSI_MAX_CMDS_PER_LUN
)
1403 qdepth
= IBMVSCSI_MAX_CMDS_PER_LUN
;
1405 scsi_adjust_queue_depth(sdev
, 0, qdepth
);
1406 return sdev
->queue_depth
;
1409 /* ------------------------------------------------------------
1412 static ssize_t
show_host_srp_version(struct class_device
*class_dev
, char *buf
)
1414 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1415 struct ibmvscsi_host_data
*hostdata
=
1416 (struct ibmvscsi_host_data
*)shost
->hostdata
;
1419 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1420 hostdata
->madapter_info
.srp_version
);
1424 static struct class_device_attribute ibmvscsi_host_srp_version
= {
1426 .name
= "srp_version",
1429 .show
= show_host_srp_version
,
1432 static ssize_t
show_host_partition_name(struct class_device
*class_dev
,
1435 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1436 struct ibmvscsi_host_data
*hostdata
=
1437 (struct ibmvscsi_host_data
*)shost
->hostdata
;
1440 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1441 hostdata
->madapter_info
.partition_name
);
1445 static struct class_device_attribute ibmvscsi_host_partition_name
= {
1447 .name
= "partition_name",
1450 .show
= show_host_partition_name
,
1453 static ssize_t
show_host_partition_number(struct class_device
*class_dev
,
1456 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1457 struct ibmvscsi_host_data
*hostdata
=
1458 (struct ibmvscsi_host_data
*)shost
->hostdata
;
1461 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1462 hostdata
->madapter_info
.partition_number
);
1466 static struct class_device_attribute ibmvscsi_host_partition_number
= {
1468 .name
= "partition_number",
1471 .show
= show_host_partition_number
,
1474 static ssize_t
show_host_mad_version(struct class_device
*class_dev
, char *buf
)
1476 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1477 struct ibmvscsi_host_data
*hostdata
=
1478 (struct ibmvscsi_host_data
*)shost
->hostdata
;
1481 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1482 hostdata
->madapter_info
.mad_version
);
1486 static struct class_device_attribute ibmvscsi_host_mad_version
= {
1488 .name
= "mad_version",
1491 .show
= show_host_mad_version
,
1494 static ssize_t
show_host_os_type(struct class_device
*class_dev
, char *buf
)
1496 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1497 struct ibmvscsi_host_data
*hostdata
=
1498 (struct ibmvscsi_host_data
*)shost
->hostdata
;
1501 len
= snprintf(buf
, PAGE_SIZE
, "%d\n", hostdata
->madapter_info
.os_type
);
1505 static struct class_device_attribute ibmvscsi_host_os_type
= {
1510 .show
= show_host_os_type
,
1513 static ssize_t
show_host_config(struct class_device
*class_dev
, char *buf
)
1515 struct Scsi_Host
*shost
= class_to_shost(class_dev
);
1516 struct ibmvscsi_host_data
*hostdata
=
1517 (struct ibmvscsi_host_data
*)shost
->hostdata
;
1519 /* returns null-terminated host config data */
1520 if (ibmvscsi_do_host_config(hostdata
, buf
, PAGE_SIZE
) == 0)
1526 static struct class_device_attribute ibmvscsi_host_config
= {
1531 .show
= show_host_config
,
1534 static struct class_device_attribute
*ibmvscsi_attrs
[] = {
1535 &ibmvscsi_host_srp_version
,
1536 &ibmvscsi_host_partition_name
,
1537 &ibmvscsi_host_partition_number
,
1538 &ibmvscsi_host_mad_version
,
1539 &ibmvscsi_host_os_type
,
1540 &ibmvscsi_host_config
,
1544 /* ------------------------------------------------------------
1545 * SCSI driver registration
1547 static struct scsi_host_template driver_template
= {
1548 .module
= THIS_MODULE
,
1549 .name
= "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION
,
1550 .proc_name
= "ibmvscsi",
1551 .queuecommand
= ibmvscsi_queuecommand
,
1552 .eh_abort_handler
= ibmvscsi_eh_abort_handler
,
1553 .eh_device_reset_handler
= ibmvscsi_eh_device_reset_handler
,
1554 .eh_host_reset_handler
= ibmvscsi_eh_host_reset_handler
,
1555 .slave_configure
= ibmvscsi_slave_configure
,
1556 .change_queue_depth
= ibmvscsi_change_queue_depth
,
1558 .can_queue
= IBMVSCSI_MAX_REQUESTS_DEFAULT
,
1560 .sg_tablesize
= SG_ALL
,
1561 .use_clustering
= ENABLE_CLUSTERING
,
1562 .shost_attrs
= ibmvscsi_attrs
,
1566 * Called by bus code for each adapter
1568 static int ibmvscsi_probe(struct vio_dev
*vdev
, const struct vio_device_id
*id
)
1570 struct ibmvscsi_host_data
*hostdata
;
1571 struct Scsi_Host
*host
;
1572 struct device
*dev
= &vdev
->dev
;
1573 unsigned long wait_switch
= 0;
1576 vdev
->dev
.driver_data
= NULL
;
1578 driver_template
.can_queue
= max_requests
;
1579 host
= scsi_host_alloc(&driver_template
, sizeof(*hostdata
));
1581 dev_err(&vdev
->dev
, "couldn't allocate host data\n");
1582 goto scsi_host_alloc_failed
;
1585 hostdata
= (struct ibmvscsi_host_data
*)host
->hostdata
;
1586 memset(hostdata
, 0x00, sizeof(*hostdata
));
1587 INIT_LIST_HEAD(&hostdata
->sent
);
1588 hostdata
->host
= host
;
1589 hostdata
->dev
= dev
;
1590 atomic_set(&hostdata
->request_limit
, -1);
1591 hostdata
->host
->max_sectors
= 32 * 8; /* default max I/O 32 pages */
1593 rc
= ibmvscsi_init_crq_queue(&hostdata
->queue
, hostdata
, max_requests
);
1594 if (rc
!= 0 && rc
!= H_RESOURCE
) {
1595 dev_err(&vdev
->dev
, "couldn't initialize crq. rc=%d\n", rc
);
1596 goto init_crq_failed
;
1598 if (initialize_event_pool(&hostdata
->pool
, max_requests
, hostdata
) != 0) {
1599 dev_err(&vdev
->dev
, "couldn't initialize event pool\n");
1600 goto init_pool_failed
;
1604 host
->max_id
= max_id
;
1605 host
->max_channel
= max_channel
;
1607 if (scsi_add_host(hostdata
->host
, hostdata
->dev
))
1608 goto add_host_failed
;
1610 /* Try to send an initialization message. Note that this is allowed
1611 * to fail if the other end is not acive. In that case we don't
1614 if (ibmvscsi_send_crq(hostdata
, 0xC001000000000000LL
, 0) == 0
1615 || rc
== H_RESOURCE
) {
1617 * Wait around max init_timeout secs for the adapter to finish
1618 * initializing. When we are done initializing, we will have a
1619 * valid request_limit. We don't want Linux scanning before
1622 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1623 time_before(jiffies
, wait_switch
) &&
1624 atomic_read(&hostdata
->request_limit
) < 2;) {
1629 /* if we now have a valid request_limit, initiate a scan */
1630 if (atomic_read(&hostdata
->request_limit
) > 0)
1631 scsi_scan_host(host
);
1634 vdev
->dev
.driver_data
= hostdata
;
1638 release_event_pool(&hostdata
->pool
, hostdata
);
1640 ibmvscsi_release_crq_queue(&hostdata
->queue
, hostdata
, max_requests
);
1642 scsi_host_put(host
);
1643 scsi_host_alloc_failed
:
1647 static int ibmvscsi_remove(struct vio_dev
*vdev
)
1649 struct ibmvscsi_host_data
*hostdata
= vdev
->dev
.driver_data
;
1650 release_event_pool(&hostdata
->pool
, hostdata
);
1651 ibmvscsi_release_crq_queue(&hostdata
->queue
, hostdata
,
1654 scsi_remove_host(hostdata
->host
);
1655 scsi_host_put(hostdata
->host
);
1661 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1664 static struct vio_device_id ibmvscsi_device_table
[] __devinitdata
= {
1665 {"vscsi", "IBM,v-scsi"},
1668 MODULE_DEVICE_TABLE(vio
, ibmvscsi_device_table
);
1670 static struct vio_driver ibmvscsi_driver
= {
1671 .id_table
= ibmvscsi_device_table
,
1672 .probe
= ibmvscsi_probe
,
1673 .remove
= ibmvscsi_remove
,
1676 .owner
= THIS_MODULE
,
1680 int __init
ibmvscsi_module_init(void)
1682 return vio_register_driver(&ibmvscsi_driver
);
1685 void __exit
ibmvscsi_module_exit(void)
1687 vio_unregister_driver(&ibmvscsi_driver
);
1690 module_init(ibmvscsi_module_init
);
1691 module_exit(ibmvscsi_module_exit
);