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>
73 #include <asm/firmware.h>
75 #include <asm/firmware.h>
76 #include <scsi/scsi.h>
77 #include <scsi/scsi_cmnd.h>
78 #include <scsi/scsi_host.h>
79 #include <scsi/scsi_device.h>
80 #include <scsi/scsi_transport_srp.h>
83 /* The values below are somewhat arbitrary default values, but
84 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
85 * Note that there are 3 bits of channel value, 6 bits of id, and
88 static int max_id
= 64;
89 static int max_channel
= 3;
90 static int init_timeout
= 5;
91 static int max_requests
= IBMVSCSI_MAX_REQUESTS_DEFAULT
;
92 static int max_events
= IBMVSCSI_MAX_REQUESTS_DEFAULT
+ 2;
94 static struct scsi_transport_template
*ibmvscsi_transport_template
;
96 #define IBMVSCSI_VERSION "1.5.8"
98 static struct ibmvscsi_ops
*ibmvscsi_ops
;
100 MODULE_DESCRIPTION("IBM Virtual SCSI");
101 MODULE_AUTHOR("Dave Boutcher");
102 MODULE_LICENSE("GPL");
103 MODULE_VERSION(IBMVSCSI_VERSION
);
105 module_param_named(max_id
, max_id
, int, S_IRUGO
| S_IWUSR
);
106 MODULE_PARM_DESC(max_id
, "Largest ID value for each channel");
107 module_param_named(max_channel
, max_channel
, int, S_IRUGO
| S_IWUSR
);
108 MODULE_PARM_DESC(max_channel
, "Largest channel value");
109 module_param_named(init_timeout
, init_timeout
, int, S_IRUGO
| S_IWUSR
);
110 MODULE_PARM_DESC(init_timeout
, "Initialization timeout in seconds");
111 module_param_named(max_requests
, max_requests
, int, S_IRUGO
);
112 MODULE_PARM_DESC(max_requests
, "Maximum requests for this adapter");
114 /* ------------------------------------------------------------
115 * Routines for the event pool and event structs
118 * initialize_event_pool: - Allocates and initializes the event pool for a host
119 * @pool: event_pool to be initialized
120 * @size: Number of events in pool
121 * @hostdata: ibmvscsi_host_data who owns the event pool
123 * Returns zero on success.
125 static int initialize_event_pool(struct event_pool
*pool
,
126 int size
, struct ibmvscsi_host_data
*hostdata
)
132 pool
->events
= kcalloc(pool
->size
, sizeof(*pool
->events
), GFP_KERNEL
);
137 dma_alloc_coherent(hostdata
->dev
,
138 pool
->size
* sizeof(*pool
->iu_storage
),
140 if (!pool
->iu_storage
) {
145 for (i
= 0; i
< pool
->size
; ++i
) {
146 struct srp_event_struct
*evt
= &pool
->events
[i
];
147 memset(&evt
->crq
, 0x00, sizeof(evt
->crq
));
148 atomic_set(&evt
->free
, 1);
149 evt
->crq
.valid
= 0x80;
150 evt
->crq
.IU_length
= sizeof(*evt
->xfer_iu
);
151 evt
->crq
.IU_data_ptr
= pool
->iu_token
+
152 sizeof(*evt
->xfer_iu
) * i
;
153 evt
->xfer_iu
= pool
->iu_storage
+ i
;
154 evt
->hostdata
= hostdata
;
155 evt
->ext_list
= NULL
;
156 evt
->ext_list_token
= 0;
163 * release_event_pool: - Frees memory of an event pool of a host
164 * @pool: event_pool to be released
165 * @hostdata: ibmvscsi_host_data who owns the even pool
167 * Returns zero on success.
169 static void release_event_pool(struct event_pool
*pool
,
170 struct ibmvscsi_host_data
*hostdata
)
173 for (i
= 0; i
< pool
->size
; ++i
) {
174 if (atomic_read(&pool
->events
[i
].free
) != 1)
176 if (pool
->events
[i
].ext_list
) {
177 dma_free_coherent(hostdata
->dev
,
178 SG_ALL
* sizeof(struct srp_direct_buf
),
179 pool
->events
[i
].ext_list
,
180 pool
->events
[i
].ext_list_token
);
184 dev_warn(hostdata
->dev
, "releasing event pool with %d "
185 "events still in use?\n", in_use
);
187 dma_free_coherent(hostdata
->dev
,
188 pool
->size
* sizeof(*pool
->iu_storage
),
189 pool
->iu_storage
, pool
->iu_token
);
193 * valid_event_struct: - Determines if event is valid.
194 * @pool: event_pool that contains the event
195 * @evt: srp_event_struct to be checked for validity
197 * Returns zero if event is invalid, one otherwise.
199 static int valid_event_struct(struct event_pool
*pool
,
200 struct srp_event_struct
*evt
)
202 int index
= evt
- pool
->events
;
203 if (index
< 0 || index
>= pool
->size
) /* outside of bounds */
205 if (evt
!= pool
->events
+ index
) /* unaligned */
211 * ibmvscsi_free-event_struct: - Changes status of event to "free"
212 * @pool: event_pool that contains the event
213 * @evt: srp_event_struct to be modified
216 static void free_event_struct(struct event_pool
*pool
,
217 struct srp_event_struct
*evt
)
219 if (!valid_event_struct(pool
, evt
)) {
220 dev_err(evt
->hostdata
->dev
, "Freeing invalid event_struct %p "
221 "(not in pool %p)\n", evt
, pool
->events
);
224 if (atomic_inc_return(&evt
->free
) != 1) {
225 dev_err(evt
->hostdata
->dev
, "Freeing event_struct %p "
226 "which is not in use!\n", evt
);
232 * get_evt_struct: - Gets the next free event in pool
233 * @pool: event_pool that contains the events to be searched
235 * Returns the next event in "free" state, and NULL if none are free.
236 * Note that no synchronization is done here, we assume the host_lock
237 * will syncrhonze things.
239 static struct srp_event_struct
*get_event_struct(struct event_pool
*pool
)
242 int poolsize
= pool
->size
;
243 int offset
= pool
->next
;
245 for (i
= 0; i
< poolsize
; i
++) {
246 offset
= (offset
+ 1) % poolsize
;
247 if (!atomic_dec_if_positive(&pool
->events
[offset
].free
)) {
249 return &pool
->events
[offset
];
253 printk(KERN_ERR
"ibmvscsi: found no event struct in pool!\n");
258 * init_event_struct: Initialize fields in an event struct that are always
261 * @done: Routine to call when the event is responded to
262 * @format: SRP or MAD format
263 * @timeout: timeout value set in the CRQ
265 static void init_event_struct(struct srp_event_struct
*evt_struct
,
266 void (*done
) (struct srp_event_struct
*),
270 evt_struct
->cmnd
= NULL
;
271 evt_struct
->cmnd_done
= NULL
;
272 evt_struct
->sync_srp
= NULL
;
273 evt_struct
->crq
.format
= format
;
274 evt_struct
->crq
.timeout
= timeout
;
275 evt_struct
->done
= done
;
278 /* ------------------------------------------------------------
279 * Routines for receiving SCSI responses from the hosting partition
283 * set_srp_direction: Set the fields in the srp related to data
284 * direction and number of buffers based on the direction in
285 * the scsi_cmnd and the number of buffers
287 static void set_srp_direction(struct scsi_cmnd
*cmd
,
288 struct srp_cmd
*srp_cmd
,
297 fmt
= SRP_DATA_DESC_DIRECT
;
299 fmt
= SRP_DATA_DESC_INDIRECT
;
300 numbuf
= min(numbuf
, MAX_INDIRECT_BUFS
);
302 if (cmd
->sc_data_direction
== DMA_TO_DEVICE
)
303 srp_cmd
->data_out_desc_cnt
= numbuf
;
305 srp_cmd
->data_in_desc_cnt
= numbuf
;
308 if (cmd
->sc_data_direction
== DMA_TO_DEVICE
)
309 srp_cmd
->buf_fmt
= fmt
<< 4;
311 srp_cmd
->buf_fmt
= fmt
;
314 static void unmap_sg_list(int num_entries
,
316 struct srp_direct_buf
*md
)
320 for (i
= 0; i
< num_entries
; ++i
)
321 dma_unmap_single(dev
, md
[i
].va
, md
[i
].len
, DMA_BIDIRECTIONAL
);
325 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
326 * @cmd: srp_cmd whose additional_data member will be unmapped
327 * @dev: device for which the memory is mapped
330 static void unmap_cmd_data(struct srp_cmd
*cmd
,
331 struct srp_event_struct
*evt_struct
,
336 out_fmt
= cmd
->buf_fmt
>> 4;
337 in_fmt
= cmd
->buf_fmt
& ((1U << 4) - 1);
339 if (out_fmt
== SRP_NO_DATA_DESC
&& in_fmt
== SRP_NO_DATA_DESC
)
341 else if (out_fmt
== SRP_DATA_DESC_DIRECT
||
342 in_fmt
== SRP_DATA_DESC_DIRECT
) {
343 struct srp_direct_buf
*data
=
344 (struct srp_direct_buf
*) cmd
->add_data
;
345 dma_unmap_single(dev
, data
->va
, data
->len
, DMA_BIDIRECTIONAL
);
347 struct srp_indirect_buf
*indirect
=
348 (struct srp_indirect_buf
*) cmd
->add_data
;
349 int num_mapped
= indirect
->table_desc
.len
/
350 sizeof(struct srp_direct_buf
);
352 if (num_mapped
<= MAX_INDIRECT_BUFS
) {
353 unmap_sg_list(num_mapped
, dev
, &indirect
->desc_list
[0]);
357 unmap_sg_list(num_mapped
, dev
, evt_struct
->ext_list
);
361 static int map_sg_list(struct scsi_cmnd
*cmd
, int nseg
,
362 struct srp_direct_buf
*md
)
365 struct scatterlist
*sg
;
366 u64 total_length
= 0;
368 scsi_for_each_sg(cmd
, sg
, nseg
, i
) {
369 struct srp_direct_buf
*descr
= md
+ i
;
370 descr
->va
= sg_dma_address(sg
);
371 descr
->len
= sg_dma_len(sg
);
373 total_length
+= sg_dma_len(sg
);
379 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
380 * @cmd: Scsi_Cmnd with the scatterlist
381 * @srp_cmd: srp_cmd that contains the memory descriptor
382 * @dev: device for which to map dma memory
384 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
385 * Returns 1 on success.
387 static int map_sg_data(struct scsi_cmnd
*cmd
,
388 struct srp_event_struct
*evt_struct
,
389 struct srp_cmd
*srp_cmd
, struct device
*dev
)
393 u64 total_length
= 0;
394 struct srp_direct_buf
*data
=
395 (struct srp_direct_buf
*) srp_cmd
->add_data
;
396 struct srp_indirect_buf
*indirect
=
397 (struct srp_indirect_buf
*) data
;
399 sg_mapped
= scsi_dma_map(cmd
);
402 else if (sg_mapped
< 0)
405 set_srp_direction(cmd
, srp_cmd
, sg_mapped
);
407 /* special case; we can use a single direct descriptor */
408 if (sg_mapped
== 1) {
409 map_sg_list(cmd
, sg_mapped
, data
);
413 indirect
->table_desc
.va
= 0;
414 indirect
->table_desc
.len
= sg_mapped
* sizeof(struct srp_direct_buf
);
415 indirect
->table_desc
.key
= 0;
417 if (sg_mapped
<= MAX_INDIRECT_BUFS
) {
418 total_length
= map_sg_list(cmd
, sg_mapped
,
419 &indirect
->desc_list
[0]);
420 indirect
->len
= total_length
;
424 /* get indirect table */
425 if (!evt_struct
->ext_list
) {
426 evt_struct
->ext_list
= (struct srp_direct_buf
*)
427 dma_alloc_coherent(dev
,
428 SG_ALL
* sizeof(struct srp_direct_buf
),
429 &evt_struct
->ext_list_token
, 0);
430 if (!evt_struct
->ext_list
) {
431 if (!firmware_has_feature(FW_FEATURE_CMO
))
432 sdev_printk(KERN_ERR
, cmd
->device
,
433 "Can't allocate memory "
434 "for indirect table\n");
439 total_length
= map_sg_list(cmd
, sg_mapped
, evt_struct
->ext_list
);
441 indirect
->len
= total_length
;
442 indirect
->table_desc
.va
= evt_struct
->ext_list_token
;
443 indirect
->table_desc
.len
= sg_mapped
* sizeof(indirect
->desc_list
[0]);
444 memcpy(indirect
->desc_list
, evt_struct
->ext_list
,
445 MAX_INDIRECT_BUFS
* sizeof(struct srp_direct_buf
));
450 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
451 * @cmd: struct scsi_cmnd with the memory to be mapped
452 * @srp_cmd: srp_cmd that contains the memory descriptor
453 * @dev: dma device for which to map dma memory
455 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
456 * Returns 1 on success.
458 static int map_data_for_srp_cmd(struct scsi_cmnd
*cmd
,
459 struct srp_event_struct
*evt_struct
,
460 struct srp_cmd
*srp_cmd
, struct device
*dev
)
462 switch (cmd
->sc_data_direction
) {
463 case DMA_FROM_DEVICE
:
468 case DMA_BIDIRECTIONAL
:
469 sdev_printk(KERN_ERR
, cmd
->device
,
470 "Can't map DMA_BIDIRECTIONAL to read/write\n");
473 sdev_printk(KERN_ERR
, cmd
->device
,
474 "Unknown data direction 0x%02x; can't map!\n",
475 cmd
->sc_data_direction
);
479 return map_sg_data(cmd
, evt_struct
, srp_cmd
, dev
);
483 * purge_requests: Our virtual adapter just shut down. purge any sent requests
484 * @hostdata: the adapter
486 static void purge_requests(struct ibmvscsi_host_data
*hostdata
, int error_code
)
488 struct srp_event_struct
*tmp_evt
, *pos
;
491 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
492 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
493 list_del(&tmp_evt
->list
);
494 del_timer(&tmp_evt
->timer
);
496 tmp_evt
->cmnd
->result
= (error_code
<< 16);
497 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
,
499 tmp_evt
->hostdata
->dev
);
500 if (tmp_evt
->cmnd_done
)
501 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
502 } else if (tmp_evt
->done
)
503 tmp_evt
->done(tmp_evt
);
504 free_event_struct(&tmp_evt
->hostdata
->pool
, tmp_evt
);
506 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
510 * ibmvscsi_reset_host - Reset the connection to the server
511 * @hostdata: struct ibmvscsi_host_data to reset
513 static void ibmvscsi_reset_host(struct ibmvscsi_host_data
*hostdata
)
515 scsi_block_requests(hostdata
->host
);
516 atomic_set(&hostdata
->request_limit
, 0);
518 purge_requests(hostdata
, DID_ERROR
);
519 if ((ibmvscsi_ops
->reset_crq_queue(&hostdata
->queue
, hostdata
)) ||
520 (ibmvscsi_ops
->send_crq(hostdata
, 0xC001000000000000LL
, 0)) ||
521 (vio_enable_interrupts(to_vio_dev(hostdata
->dev
)))) {
522 atomic_set(&hostdata
->request_limit
, -1);
523 dev_err(hostdata
->dev
, "error after reset\n");
526 scsi_unblock_requests(hostdata
->host
);
530 * ibmvscsi_timeout - Internal command timeout handler
531 * @evt_struct: struct srp_event_struct that timed out
533 * Called when an internally generated command times out
535 static void ibmvscsi_timeout(struct srp_event_struct
*evt_struct
)
537 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
539 dev_err(hostdata
->dev
, "Command timed out (%x). Resetting connection\n",
540 evt_struct
->iu
.srp
.cmd
.opcode
);
542 ibmvscsi_reset_host(hostdata
);
546 /* ------------------------------------------------------------
547 * Routines for sending and receiving SRPs
550 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
551 * @evt_struct: evt_struct to be sent
552 * @hostdata: ibmvscsi_host_data of host
553 * @timeout: timeout in seconds - 0 means do not time command
555 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
556 * Note that this routine assumes that host_lock is held for synchronization
558 static int ibmvscsi_send_srp_event(struct srp_event_struct
*evt_struct
,
559 struct ibmvscsi_host_data
*hostdata
,
560 unsigned long timeout
)
562 u64
*crq_as_u64
= (u64
*) &evt_struct
->crq
;
563 int request_status
= 0;
566 /* If we have exhausted our request limit, just fail this request,
567 * unless it is for a reset or abort.
568 * Note that there are rare cases involving driver generated requests
569 * (such as task management requests) that the mid layer may think we
570 * can handle more requests (can_queue) when we actually can't
572 if (evt_struct
->crq
.format
== VIOSRP_SRP_FORMAT
) {
574 atomic_dec_if_positive(&hostdata
->request_limit
);
575 /* If request limit was -1 when we started, it is now even
578 if (request_status
< -1)
580 /* Otherwise, we may have run out of requests. */
581 /* If request limit was 0 when we started the adapter is in the
582 * process of performing a login with the server adapter, or
583 * we may have run out of requests.
585 else if (request_status
== -1 &&
586 evt_struct
->iu
.srp
.login_req
.opcode
!= SRP_LOGIN_REQ
)
588 /* Abort and reset calls should make it through.
589 * Nothing except abort and reset should use the last two
590 * slots unless we had two or less to begin with.
592 else if (request_status
< 2 &&
593 evt_struct
->iu
.srp
.cmd
.opcode
!= SRP_TSK_MGMT
) {
594 /* In the case that we have less than two requests
595 * available, check the server limit as a combination
596 * of the request limit and the number of requests
597 * in-flight (the size of the send list). If the
598 * server limit is greater than 2, return busy so
599 * that the last two are reserved for reset and abort.
601 int server_limit
= request_status
;
602 struct srp_event_struct
*tmp_evt
;
604 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
608 if (server_limit
> 2)
613 /* Copy the IU into the transfer area */
614 *evt_struct
->xfer_iu
= evt_struct
->iu
;
615 evt_struct
->xfer_iu
->srp
.rsp
.tag
= (u64
)evt_struct
;
617 /* Add this to the sent list. We need to do this
618 * before we actually send
619 * in case it comes back REALLY fast
621 list_add_tail(&evt_struct
->list
, &hostdata
->sent
);
623 init_timer(&evt_struct
->timer
);
625 evt_struct
->timer
.data
= (unsigned long) evt_struct
;
626 evt_struct
->timer
.expires
= jiffies
+ (timeout
* HZ
);
627 evt_struct
->timer
.function
= (void (*)(unsigned long))ibmvscsi_timeout
;
628 add_timer(&evt_struct
->timer
);
632 ibmvscsi_ops
->send_crq(hostdata
, crq_as_u64
[0], crq_as_u64
[1])) != 0) {
633 list_del(&evt_struct
->list
);
634 del_timer(&evt_struct
->timer
);
636 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
637 * Firmware will send a CRQ with a transport event (0xFF) to
638 * tell this client what has happened to the transport. This
639 * will be handled in ibmvscsi_handle_crq()
641 if (rc
== H_CLOSED
) {
642 dev_warn(hostdata
->dev
, "send warning. "
643 "Receive queue closed, will retry.\n");
646 dev_err(hostdata
->dev
, "send error %d\n", rc
);
647 atomic_inc(&hostdata
->request_limit
);
654 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
656 free_event_struct(&hostdata
->pool
, evt_struct
);
657 if (request_status
!= -1)
658 atomic_inc(&hostdata
->request_limit
);
659 return SCSI_MLQUEUE_HOST_BUSY
;
662 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
, evt_struct
, hostdata
->dev
);
664 if (evt_struct
->cmnd
!= NULL
) {
665 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
666 evt_struct
->cmnd_done(evt_struct
->cmnd
);
667 } else if (evt_struct
->done
)
668 evt_struct
->done(evt_struct
);
670 free_event_struct(&hostdata
->pool
, evt_struct
);
675 * handle_cmd_rsp: - Handle responses from commands
676 * @evt_struct: srp_event_struct to be handled
678 * Used as a callback by when sending scsi cmds.
679 * Gets called by ibmvscsi_handle_crq()
681 static void handle_cmd_rsp(struct srp_event_struct
*evt_struct
)
683 struct srp_rsp
*rsp
= &evt_struct
->xfer_iu
->srp
.rsp
;
684 struct scsi_cmnd
*cmnd
= evt_struct
->cmnd
;
686 if (unlikely(rsp
->opcode
!= SRP_RSP
)) {
687 if (printk_ratelimit())
688 dev_warn(evt_struct
->hostdata
->dev
,
689 "bad SRP RSP type %d\n", rsp
->opcode
);
693 cmnd
->result
|= rsp
->status
;
694 if (((cmnd
->result
>> 1) & 0x1f) == CHECK_CONDITION
)
695 memcpy(cmnd
->sense_buffer
,
697 rsp
->sense_data_len
);
698 unmap_cmd_data(&evt_struct
->iu
.srp
.cmd
,
700 evt_struct
->hostdata
->dev
);
702 if (rsp
->flags
& SRP_RSP_FLAG_DOOVER
)
703 scsi_set_resid(cmnd
, rsp
->data_out_res_cnt
);
704 else if (rsp
->flags
& SRP_RSP_FLAG_DIOVER
)
705 scsi_set_resid(cmnd
, rsp
->data_in_res_cnt
);
708 if (evt_struct
->cmnd_done
)
709 evt_struct
->cmnd_done(cmnd
);
713 * lun_from_dev: - Returns the lun of the scsi device
714 * @dev: struct scsi_device
717 static inline u16
lun_from_dev(struct scsi_device
*dev
)
719 return (0x2 << 14) | (dev
->id
<< 8) | (dev
->channel
<< 5) | dev
->lun
;
723 * ibmvscsi_queue: - The queuecommand function of the scsi template
724 * @cmd: struct scsi_cmnd to be executed
725 * @done: Callback function to be called when cmd is completed
727 static int ibmvscsi_queuecommand(struct scsi_cmnd
*cmnd
,
728 void (*done
) (struct scsi_cmnd
*))
730 struct srp_cmd
*srp_cmd
;
731 struct srp_event_struct
*evt_struct
;
732 struct srp_indirect_buf
*indirect
;
733 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmnd
->device
->host
);
734 u16 lun
= lun_from_dev(cmnd
->device
);
737 cmnd
->result
= (DID_OK
<< 16);
738 evt_struct
= get_event_struct(&hostdata
->pool
);
740 return SCSI_MLQUEUE_HOST_BUSY
;
742 /* Set up the actual SRP IU */
743 srp_cmd
= &evt_struct
->iu
.srp
.cmd
;
744 memset(srp_cmd
, 0x00, SRP_MAX_IU_LEN
);
745 srp_cmd
->opcode
= SRP_CMD
;
746 memcpy(srp_cmd
->cdb
, cmnd
->cmnd
, sizeof(srp_cmd
->cdb
));
747 srp_cmd
->lun
= ((u64
) lun
) << 48;
749 if (!map_data_for_srp_cmd(cmnd
, evt_struct
, srp_cmd
, hostdata
->dev
)) {
750 if (!firmware_has_feature(FW_FEATURE_CMO
))
751 sdev_printk(KERN_ERR
, cmnd
->device
,
752 "couldn't convert cmd to srp_cmd\n");
753 free_event_struct(&hostdata
->pool
, evt_struct
);
754 return SCSI_MLQUEUE_HOST_BUSY
;
757 init_event_struct(evt_struct
,
760 cmnd
->request
->timeout
/HZ
);
762 evt_struct
->cmnd
= cmnd
;
763 evt_struct
->cmnd_done
= done
;
765 /* Fix up dma address of the buffer itself */
766 indirect
= (struct srp_indirect_buf
*) srp_cmd
->add_data
;
767 out_fmt
= srp_cmd
->buf_fmt
>> 4;
768 in_fmt
= srp_cmd
->buf_fmt
& ((1U << 4) - 1);
769 if ((in_fmt
== SRP_DATA_DESC_INDIRECT
||
770 out_fmt
== SRP_DATA_DESC_INDIRECT
) &&
771 indirect
->table_desc
.va
== 0) {
772 indirect
->table_desc
.va
= evt_struct
->crq
.IU_data_ptr
+
773 offsetof(struct srp_cmd
, add_data
) +
774 offsetof(struct srp_indirect_buf
, desc_list
);
777 return ibmvscsi_send_srp_event(evt_struct
, hostdata
, 0);
780 /* ------------------------------------------------------------
781 * Routines for driver initialization
784 * adapter_info_rsp: - Handle response to MAD adapter info request
785 * @evt_struct: srp_event_struct with the response
787 * Used as a "done" callback by when sending adapter_info. Gets called
788 * by ibmvscsi_handle_crq()
790 static void adapter_info_rsp(struct srp_event_struct
*evt_struct
)
792 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
793 dma_unmap_single(hostdata
->dev
,
794 evt_struct
->iu
.mad
.adapter_info
.buffer
,
795 evt_struct
->iu
.mad
.adapter_info
.common
.length
,
798 if (evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
) {
799 dev_err(hostdata
->dev
, "error %d getting adapter info\n",
800 evt_struct
->xfer_iu
->mad
.adapter_info
.common
.status
);
802 dev_info(hostdata
->dev
, "host srp version: %s, "
803 "host partition %s (%d), OS %d, max io %u\n",
804 hostdata
->madapter_info
.srp_version
,
805 hostdata
->madapter_info
.partition_name
,
806 hostdata
->madapter_info
.partition_number
,
807 hostdata
->madapter_info
.os_type
,
808 hostdata
->madapter_info
.port_max_txu
[0]);
810 if (hostdata
->madapter_info
.port_max_txu
[0])
811 hostdata
->host
->max_sectors
=
812 hostdata
->madapter_info
.port_max_txu
[0] >> 9;
814 if (hostdata
->madapter_info
.os_type
== 3 &&
815 strcmp(hostdata
->madapter_info
.srp_version
, "1.6a") <= 0) {
816 dev_err(hostdata
->dev
, "host (Ver. %s) doesn't support large transfers\n",
817 hostdata
->madapter_info
.srp_version
);
818 dev_err(hostdata
->dev
, "limiting scatterlists to %d\n",
820 hostdata
->host
->sg_tablesize
= MAX_INDIRECT_BUFS
;
826 * send_mad_adapter_info: - Sends the mad adapter info request
827 * and stores the result so it can be retrieved with
828 * sysfs. We COULD consider causing a failure if the
829 * returned SRP version doesn't match ours.
830 * @hostdata: ibmvscsi_host_data of host
832 * Returns zero if successful.
834 static void send_mad_adapter_info(struct ibmvscsi_host_data
*hostdata
)
836 struct viosrp_adapter_info
*req
;
837 struct srp_event_struct
*evt_struct
;
841 evt_struct
= get_event_struct(&hostdata
->pool
);
843 dev_err(hostdata
->dev
,
844 "couldn't allocate an event for ADAPTER_INFO_REQ!\n");
848 init_event_struct(evt_struct
,
853 req
= &evt_struct
->iu
.mad
.adapter_info
;
854 memset(req
, 0x00, sizeof(*req
));
856 req
->common
.type
= VIOSRP_ADAPTER_INFO_TYPE
;
857 req
->common
.length
= sizeof(hostdata
->madapter_info
);
858 req
->buffer
= addr
= dma_map_single(hostdata
->dev
,
859 &hostdata
->madapter_info
,
860 sizeof(hostdata
->madapter_info
),
863 if (dma_mapping_error(hostdata
->dev
, req
->buffer
)) {
864 if (!firmware_has_feature(FW_FEATURE_CMO
))
865 dev_err(hostdata
->dev
,
866 "Unable to map request_buffer for "
868 free_event_struct(&hostdata
->pool
, evt_struct
);
872 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
873 if (ibmvscsi_send_srp_event(evt_struct
, hostdata
, init_timeout
* 2)) {
874 dev_err(hostdata
->dev
, "couldn't send ADAPTER_INFO_REQ!\n");
875 dma_unmap_single(hostdata
->dev
,
877 sizeof(hostdata
->madapter_info
),
880 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
884 * login_rsp: - Handle response to SRP login request
885 * @evt_struct: srp_event_struct with the response
887 * Used as a "done" callback by when sending srp_login. Gets called
888 * by ibmvscsi_handle_crq()
890 static void login_rsp(struct srp_event_struct
*evt_struct
)
892 struct ibmvscsi_host_data
*hostdata
= evt_struct
->hostdata
;
893 switch (evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
) {
894 case SRP_LOGIN_RSP
: /* it worked! */
896 case SRP_LOGIN_REJ
: /* refused! */
897 dev_info(hostdata
->dev
, "SRP_LOGIN_REJ reason %u\n",
898 evt_struct
->xfer_iu
->srp
.login_rej
.reason
);
900 atomic_set(&hostdata
->request_limit
, -1);
903 dev_err(hostdata
->dev
, "Invalid login response typecode 0x%02x!\n",
904 evt_struct
->xfer_iu
->srp
.login_rsp
.opcode
);
906 atomic_set(&hostdata
->request_limit
, -1);
910 dev_info(hostdata
->dev
, "SRP_LOGIN succeeded\n");
912 if (evt_struct
->xfer_iu
->srp
.login_rsp
.req_lim_delta
< 0)
913 dev_err(hostdata
->dev
, "Invalid request_limit.\n");
915 /* Now we know what the real request-limit is.
916 * This value is set rather than added to request_limit because
917 * request_limit could have been set to -1 by this client.
919 atomic_set(&hostdata
->request_limit
,
920 evt_struct
->xfer_iu
->srp
.login_rsp
.req_lim_delta
);
922 /* If we had any pending I/Os, kick them */
923 scsi_unblock_requests(hostdata
->host
);
925 send_mad_adapter_info(hostdata
);
930 * send_srp_login: - Sends the srp login
931 * @hostdata: ibmvscsi_host_data of host
933 * Returns zero if successful.
935 static int send_srp_login(struct ibmvscsi_host_data
*hostdata
)
939 struct srp_login_req
*login
;
940 struct srp_event_struct
*evt_struct
= get_event_struct(&hostdata
->pool
);
942 dev_err(hostdata
->dev
, "couldn't allocate an event for login req!\n");
946 init_event_struct(evt_struct
,
951 login
= &evt_struct
->iu
.srp
.login_req
;
952 memset(login
, 0x00, sizeof(struct srp_login_req
));
953 login
->opcode
= SRP_LOGIN_REQ
;
954 login
->req_it_iu_len
= sizeof(union srp_iu
);
955 login
->req_buf_fmt
= SRP_BUF_FORMAT_DIRECT
| SRP_BUF_FORMAT_INDIRECT
;
957 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
958 /* Start out with a request limit of 0, since this is negotiated in
959 * the login request we are just sending and login requests always
960 * get sent by the driver regardless of request_limit.
962 atomic_set(&hostdata
->request_limit
, 0);
964 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, init_timeout
* 2);
965 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
966 dev_info(hostdata
->dev
, "sent SRP login\n");
971 * sync_completion: Signal that a synchronous command has completed
972 * Note that after returning from this call, the evt_struct is freed.
973 * the caller waiting on this completion shouldn't touch the evt_struct
976 static void sync_completion(struct srp_event_struct
*evt_struct
)
978 /* copy the response back */
979 if (evt_struct
->sync_srp
)
980 *evt_struct
->sync_srp
= *evt_struct
->xfer_iu
;
982 complete(&evt_struct
->comp
);
986 * ibmvscsi_abort: Abort a command...from scsi host template
987 * send this over to the server and wait synchronously for the response
989 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd
*cmd
)
991 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
992 struct srp_tsk_mgmt
*tsk_mgmt
;
993 struct srp_event_struct
*evt
;
994 struct srp_event_struct
*tmp_evt
, *found_evt
;
995 union viosrp_iu srp_rsp
;
998 u16 lun
= lun_from_dev(cmd
->device
);
999 unsigned long wait_switch
= 0;
1001 /* First, find this command in our sent list so we can figure
1002 * out the correct tag
1004 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1005 wait_switch
= jiffies
+ (init_timeout
* HZ
);
1008 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1009 if (tmp_evt
->cmnd
== cmd
) {
1010 found_evt
= tmp_evt
;
1016 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1020 evt
= get_event_struct(&hostdata
->pool
);
1022 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1023 sdev_printk(KERN_ERR
, cmd
->device
,
1024 "failed to allocate abort event\n");
1028 init_event_struct(evt
,
1033 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1035 /* Set up an abort SRP command */
1036 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1037 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1038 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1039 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_ABORT_TASK
;
1040 tsk_mgmt
->task_tag
= (u64
) found_evt
;
1042 evt
->sync_srp
= &srp_rsp
;
1044 init_completion(&evt
->comp
);
1045 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, init_timeout
* 2);
1047 if (rsp_rc
!= SCSI_MLQUEUE_HOST_BUSY
)
1050 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1052 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1053 } while (time_before(jiffies
, wait_switch
));
1055 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1058 sdev_printk(KERN_ERR
, cmd
->device
,
1059 "failed to send abort() event. rc=%d\n", rsp_rc
);
1063 sdev_printk(KERN_INFO
, cmd
->device
,
1064 "aborting command. lun 0x%llx, tag 0x%llx\n",
1065 (((u64
) lun
) << 48), (u64
) found_evt
);
1067 wait_for_completion(&evt
->comp
);
1069 /* make sure we got a good response */
1070 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1071 if (printk_ratelimit())
1072 sdev_printk(KERN_WARNING
, cmd
->device
, "abort bad SRP RSP type %d\n",
1073 srp_rsp
.srp
.rsp
.opcode
);
1077 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1078 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1080 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1083 if (printk_ratelimit())
1084 sdev_printk(KERN_WARNING
, cmd
->device
,
1085 "abort code %d for task tag 0x%llx\n",
1086 rsp_rc
, tsk_mgmt
->task_tag
);
1090 /* Because we dropped the spinlock above, it's possible
1091 * The event is no longer in our list. Make sure it didn't
1092 * complete while we were aborting
1094 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1096 list_for_each_entry(tmp_evt
, &hostdata
->sent
, list
) {
1097 if (tmp_evt
->cmnd
== cmd
) {
1098 found_evt
= tmp_evt
;
1103 if (found_evt
== NULL
) {
1104 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1105 sdev_printk(KERN_INFO
, cmd
->device
, "aborted task tag 0x%llx completed\n",
1106 tsk_mgmt
->task_tag
);
1110 sdev_printk(KERN_INFO
, cmd
->device
, "successfully aborted task tag 0x%llx\n",
1111 tsk_mgmt
->task_tag
);
1113 cmd
->result
= (DID_ABORT
<< 16);
1114 list_del(&found_evt
->list
);
1115 unmap_cmd_data(&found_evt
->iu
.srp
.cmd
, found_evt
,
1116 found_evt
->hostdata
->dev
);
1117 free_event_struct(&found_evt
->hostdata
->pool
, found_evt
);
1118 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1119 atomic_inc(&hostdata
->request_limit
);
1124 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1125 * template send this over to the server and wait synchronously for the
1128 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd
*cmd
)
1130 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1131 struct srp_tsk_mgmt
*tsk_mgmt
;
1132 struct srp_event_struct
*evt
;
1133 struct srp_event_struct
*tmp_evt
, *pos
;
1134 union viosrp_iu srp_rsp
;
1136 unsigned long flags
;
1137 u16 lun
= lun_from_dev(cmd
->device
);
1138 unsigned long wait_switch
= 0;
1140 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1141 wait_switch
= jiffies
+ (init_timeout
* HZ
);
1143 evt
= get_event_struct(&hostdata
->pool
);
1145 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1146 sdev_printk(KERN_ERR
, cmd
->device
,
1147 "failed to allocate reset event\n");
1151 init_event_struct(evt
,
1156 tsk_mgmt
= &evt
->iu
.srp
.tsk_mgmt
;
1158 /* Set up a lun reset SRP command */
1159 memset(tsk_mgmt
, 0x00, sizeof(*tsk_mgmt
));
1160 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1161 tsk_mgmt
->lun
= ((u64
) lun
) << 48;
1162 tsk_mgmt
->tsk_mgmt_func
= SRP_TSK_LUN_RESET
;
1164 evt
->sync_srp
= &srp_rsp
;
1166 init_completion(&evt
->comp
);
1167 rsp_rc
= ibmvscsi_send_srp_event(evt
, hostdata
, init_timeout
* 2);
1169 if (rsp_rc
!= SCSI_MLQUEUE_HOST_BUSY
)
1172 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1174 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1175 } while (time_before(jiffies
, wait_switch
));
1177 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1180 sdev_printk(KERN_ERR
, cmd
->device
,
1181 "failed to send reset event. rc=%d\n", rsp_rc
);
1185 sdev_printk(KERN_INFO
, cmd
->device
, "resetting device. lun 0x%llx\n",
1186 (((u64
) lun
) << 48));
1188 wait_for_completion(&evt
->comp
);
1190 /* make sure we got a good response */
1191 if (unlikely(srp_rsp
.srp
.rsp
.opcode
!= SRP_RSP
)) {
1192 if (printk_ratelimit())
1193 sdev_printk(KERN_WARNING
, cmd
->device
, "reset bad SRP RSP type %d\n",
1194 srp_rsp
.srp
.rsp
.opcode
);
1198 if (srp_rsp
.srp
.rsp
.flags
& SRP_RSP_FLAG_RSPVALID
)
1199 rsp_rc
= *((int *)srp_rsp
.srp
.rsp
.data
);
1201 rsp_rc
= srp_rsp
.srp
.rsp
.status
;
1204 if (printk_ratelimit())
1205 sdev_printk(KERN_WARNING
, cmd
->device
,
1206 "reset code %d for task tag 0x%llx\n",
1207 rsp_rc
, tsk_mgmt
->task_tag
);
1211 /* We need to find all commands for this LUN that have not yet been
1212 * responded to, and fail them with DID_RESET
1214 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1215 list_for_each_entry_safe(tmp_evt
, pos
, &hostdata
->sent
, list
) {
1216 if ((tmp_evt
->cmnd
) && (tmp_evt
->cmnd
->device
== cmd
->device
)) {
1218 tmp_evt
->cmnd
->result
= (DID_RESET
<< 16);
1219 list_del(&tmp_evt
->list
);
1220 unmap_cmd_data(&tmp_evt
->iu
.srp
.cmd
, tmp_evt
,
1221 tmp_evt
->hostdata
->dev
);
1222 free_event_struct(&tmp_evt
->hostdata
->pool
,
1224 atomic_inc(&hostdata
->request_limit
);
1225 if (tmp_evt
->cmnd_done
)
1226 tmp_evt
->cmnd_done(tmp_evt
->cmnd
);
1227 else if (tmp_evt
->done
)
1228 tmp_evt
->done(tmp_evt
);
1231 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1236 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1237 * @cmd: struct scsi_cmnd having problems
1239 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd
*cmd
)
1241 unsigned long wait_switch
= 0;
1242 struct ibmvscsi_host_data
*hostdata
= shost_priv(cmd
->device
->host
);
1244 dev_err(hostdata
->dev
, "Resetting connection due to error recovery\n");
1246 ibmvscsi_reset_host(hostdata
);
1248 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1249 time_before(jiffies
, wait_switch
) &&
1250 atomic_read(&hostdata
->request_limit
) < 2;) {
1255 if (atomic_read(&hostdata
->request_limit
) <= 0)
1262 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1263 * @crq: Command/Response queue
1264 * @hostdata: ibmvscsi_host_data of host
1267 void ibmvscsi_handle_crq(struct viosrp_crq
*crq
,
1268 struct ibmvscsi_host_data
*hostdata
)
1271 unsigned long flags
;
1272 struct srp_event_struct
*evt_struct
=
1273 (struct srp_event_struct
*)crq
->IU_data_ptr
;
1274 switch (crq
->valid
) {
1275 case 0xC0: /* initialization */
1276 switch (crq
->format
) {
1277 case 0x01: /* Initialization message */
1278 dev_info(hostdata
->dev
, "partner initialized\n");
1279 /* Send back a response */
1280 if ((rc
= ibmvscsi_ops
->send_crq(hostdata
,
1281 0xC002000000000000LL
, 0)) == 0) {
1283 send_srp_login(hostdata
);
1285 dev_err(hostdata
->dev
, "Unable to send init rsp. rc=%ld\n", rc
);
1289 case 0x02: /* Initialization response */
1290 dev_info(hostdata
->dev
, "partner initialization complete\n");
1293 send_srp_login(hostdata
);
1296 dev_err(hostdata
->dev
, "unknown crq message type: %d\n", crq
->format
);
1299 case 0xFF: /* Hypervisor telling us the connection is closed */
1300 scsi_block_requests(hostdata
->host
);
1301 atomic_set(&hostdata
->request_limit
, 0);
1302 if (crq
->format
== 0x06) {
1303 /* We need to re-setup the interpartition connection */
1304 dev_info(hostdata
->dev
, "Re-enabling adapter!\n");
1305 purge_requests(hostdata
, DID_REQUEUE
);
1306 if ((ibmvscsi_ops
->reenable_crq_queue(&hostdata
->queue
,
1308 (ibmvscsi_ops
->send_crq(hostdata
,
1309 0xC001000000000000LL
, 0))) {
1310 atomic_set(&hostdata
->request_limit
,
1312 dev_err(hostdata
->dev
, "error after enable\n");
1315 dev_err(hostdata
->dev
, "Virtual adapter failed rc %d!\n",
1318 purge_requests(hostdata
, DID_ERROR
);
1319 if ((ibmvscsi_ops
->reset_crq_queue(&hostdata
->queue
,
1321 (ibmvscsi_ops
->send_crq(hostdata
,
1322 0xC001000000000000LL
, 0))) {
1323 atomic_set(&hostdata
->request_limit
,
1325 dev_err(hostdata
->dev
, "error after reset\n");
1328 scsi_unblock_requests(hostdata
->host
);
1330 case 0x80: /* real payload */
1333 dev_err(hostdata
->dev
, "got an invalid message type 0x%02x\n",
1338 /* The only kind of payload CRQs we should get are responses to
1339 * things we send. Make sure this response is to something we
1342 if (!valid_event_struct(&hostdata
->pool
, evt_struct
)) {
1343 dev_err(hostdata
->dev
, "returned correlation_token 0x%p is invalid!\n",
1344 (void *)crq
->IU_data_ptr
);
1348 if (atomic_read(&evt_struct
->free
)) {
1349 dev_err(hostdata
->dev
, "received duplicate correlation_token 0x%p!\n",
1350 (void *)crq
->IU_data_ptr
);
1354 if (crq
->format
== VIOSRP_SRP_FORMAT
)
1355 atomic_add(evt_struct
->xfer_iu
->srp
.rsp
.req_lim_delta
,
1356 &hostdata
->request_limit
);
1358 del_timer(&evt_struct
->timer
);
1360 if ((crq
->status
!= VIOSRP_OK
&& crq
->status
!= VIOSRP_OK2
) && evt_struct
->cmnd
)
1361 evt_struct
->cmnd
->result
= DID_ERROR
<< 16;
1362 if (evt_struct
->done
)
1363 evt_struct
->done(evt_struct
);
1365 dev_err(hostdata
->dev
, "returned done() is NULL; not running it!\n");
1368 * Lock the host_lock before messing with these structures, since we
1369 * are running in a task context
1371 spin_lock_irqsave(evt_struct
->hostdata
->host
->host_lock
, flags
);
1372 list_del(&evt_struct
->list
);
1373 free_event_struct(&evt_struct
->hostdata
->pool
, evt_struct
);
1374 spin_unlock_irqrestore(evt_struct
->hostdata
->host
->host_lock
, flags
);
1378 * ibmvscsi_get_host_config: Send the command to the server to get host
1379 * configuration data. The data is opaque to us.
1381 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data
*hostdata
,
1382 unsigned char *buffer
, int length
)
1384 struct viosrp_host_config
*host_config
;
1385 struct srp_event_struct
*evt_struct
;
1386 unsigned long flags
;
1390 evt_struct
= get_event_struct(&hostdata
->pool
);
1392 dev_err(hostdata
->dev
, "couldn't allocate event for HOST_CONFIG!\n");
1396 init_event_struct(evt_struct
,
1401 host_config
= &evt_struct
->iu
.mad
.host_config
;
1403 /* Set up a lun reset SRP command */
1404 memset(host_config
, 0x00, sizeof(*host_config
));
1405 host_config
->common
.type
= VIOSRP_HOST_CONFIG_TYPE
;
1406 host_config
->common
.length
= length
;
1407 host_config
->buffer
= addr
= dma_map_single(hostdata
->dev
, buffer
,
1411 if (dma_mapping_error(hostdata
->dev
, host_config
->buffer
)) {
1412 if (!firmware_has_feature(FW_FEATURE_CMO
))
1413 dev_err(hostdata
->dev
,
1414 "dma_mapping error getting host config\n");
1415 free_event_struct(&hostdata
->pool
, evt_struct
);
1419 init_completion(&evt_struct
->comp
);
1420 spin_lock_irqsave(hostdata
->host
->host_lock
, flags
);
1421 rc
= ibmvscsi_send_srp_event(evt_struct
, hostdata
, init_timeout
* 2);
1422 spin_unlock_irqrestore(hostdata
->host
->host_lock
, flags
);
1424 wait_for_completion(&evt_struct
->comp
);
1425 dma_unmap_single(hostdata
->dev
, addr
, length
, DMA_BIDIRECTIONAL
);
1431 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1432 * @sdev: struct scsi_device device to configure
1434 * Enable allow_restart for a device if it is a disk. Adjust the
1435 * queue_depth here also as is required by the documentation for
1436 * struct scsi_host_template.
1438 static int ibmvscsi_slave_configure(struct scsi_device
*sdev
)
1440 struct Scsi_Host
*shost
= sdev
->host
;
1441 unsigned long lock_flags
= 0;
1443 spin_lock_irqsave(shost
->host_lock
, lock_flags
);
1444 if (sdev
->type
== TYPE_DISK
) {
1445 sdev
->allow_restart
= 1;
1446 blk_queue_rq_timeout(sdev
->request_queue
, 60 * HZ
);
1448 scsi_adjust_queue_depth(sdev
, 0, shost
->cmd_per_lun
);
1449 spin_unlock_irqrestore(shost
->host_lock
, lock_flags
);
1454 * ibmvscsi_change_queue_depth - Change the device's queue depth
1455 * @sdev: scsi device struct
1456 * @qdepth: depth to set
1461 static int ibmvscsi_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
1463 if (qdepth
> IBMVSCSI_MAX_CMDS_PER_LUN
)
1464 qdepth
= IBMVSCSI_MAX_CMDS_PER_LUN
;
1466 scsi_adjust_queue_depth(sdev
, 0, qdepth
);
1467 return sdev
->queue_depth
;
1470 /* ------------------------------------------------------------
1473 static ssize_t
show_host_srp_version(struct device
*dev
,
1474 struct device_attribute
*attr
, char *buf
)
1476 struct Scsi_Host
*shost
= class_to_shost(dev
);
1477 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1480 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1481 hostdata
->madapter_info
.srp_version
);
1485 static struct device_attribute ibmvscsi_host_srp_version
= {
1487 .name
= "srp_version",
1490 .show
= show_host_srp_version
,
1493 static ssize_t
show_host_partition_name(struct device
*dev
,
1494 struct device_attribute
*attr
,
1497 struct Scsi_Host
*shost
= class_to_shost(dev
);
1498 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1501 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1502 hostdata
->madapter_info
.partition_name
);
1506 static struct device_attribute ibmvscsi_host_partition_name
= {
1508 .name
= "partition_name",
1511 .show
= show_host_partition_name
,
1514 static ssize_t
show_host_partition_number(struct device
*dev
,
1515 struct device_attribute
*attr
,
1518 struct Scsi_Host
*shost
= class_to_shost(dev
);
1519 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1522 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1523 hostdata
->madapter_info
.partition_number
);
1527 static struct device_attribute ibmvscsi_host_partition_number
= {
1529 .name
= "partition_number",
1532 .show
= show_host_partition_number
,
1535 static ssize_t
show_host_mad_version(struct device
*dev
,
1536 struct device_attribute
*attr
, char *buf
)
1538 struct Scsi_Host
*shost
= class_to_shost(dev
);
1539 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1542 len
= snprintf(buf
, PAGE_SIZE
, "%d\n",
1543 hostdata
->madapter_info
.mad_version
);
1547 static struct device_attribute ibmvscsi_host_mad_version
= {
1549 .name
= "mad_version",
1552 .show
= show_host_mad_version
,
1555 static ssize_t
show_host_os_type(struct device
*dev
,
1556 struct device_attribute
*attr
, char *buf
)
1558 struct Scsi_Host
*shost
= class_to_shost(dev
);
1559 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1562 len
= snprintf(buf
, PAGE_SIZE
, "%d\n", hostdata
->madapter_info
.os_type
);
1566 static struct device_attribute ibmvscsi_host_os_type
= {
1571 .show
= show_host_os_type
,
1574 static ssize_t
show_host_config(struct device
*dev
,
1575 struct device_attribute
*attr
, char *buf
)
1577 struct Scsi_Host
*shost
= class_to_shost(dev
);
1578 struct ibmvscsi_host_data
*hostdata
= shost_priv(shost
);
1580 /* returns null-terminated host config data */
1581 if (ibmvscsi_do_host_config(hostdata
, buf
, PAGE_SIZE
) == 0)
1587 static struct device_attribute ibmvscsi_host_config
= {
1592 .show
= show_host_config
,
1595 static struct device_attribute
*ibmvscsi_attrs
[] = {
1596 &ibmvscsi_host_srp_version
,
1597 &ibmvscsi_host_partition_name
,
1598 &ibmvscsi_host_partition_number
,
1599 &ibmvscsi_host_mad_version
,
1600 &ibmvscsi_host_os_type
,
1601 &ibmvscsi_host_config
,
1605 /* ------------------------------------------------------------
1606 * SCSI driver registration
1608 static struct scsi_host_template driver_template
= {
1609 .module
= THIS_MODULE
,
1610 .name
= "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION
,
1611 .proc_name
= "ibmvscsi",
1612 .queuecommand
= ibmvscsi_queuecommand
,
1613 .eh_abort_handler
= ibmvscsi_eh_abort_handler
,
1614 .eh_device_reset_handler
= ibmvscsi_eh_device_reset_handler
,
1615 .eh_host_reset_handler
= ibmvscsi_eh_host_reset_handler
,
1616 .slave_configure
= ibmvscsi_slave_configure
,
1617 .change_queue_depth
= ibmvscsi_change_queue_depth
,
1618 .cmd_per_lun
= IBMVSCSI_CMDS_PER_LUN_DEFAULT
,
1619 .can_queue
= IBMVSCSI_MAX_REQUESTS_DEFAULT
,
1621 .sg_tablesize
= SG_ALL
,
1622 .use_clustering
= ENABLE_CLUSTERING
,
1623 .shost_attrs
= ibmvscsi_attrs
,
1627 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
1629 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1632 * Number of bytes of IO data the driver will need to perform well.
1634 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev
*vdev
)
1636 /* iu_storage data allocated in initialize_event_pool */
1637 unsigned long desired_io
= max_events
* sizeof(union viosrp_iu
);
1639 /* add io space for sg data */
1640 desired_io
+= (IBMVSCSI_MAX_SECTORS_DEFAULT
* 512 *
1641 IBMVSCSI_CMDS_PER_LUN_DEFAULT
);
1647 * Called by bus code for each adapter
1649 static int ibmvscsi_probe(struct vio_dev
*vdev
, const struct vio_device_id
*id
)
1651 struct ibmvscsi_host_data
*hostdata
;
1652 struct Scsi_Host
*host
;
1653 struct device
*dev
= &vdev
->dev
;
1654 struct srp_rport_identifiers ids
;
1655 struct srp_rport
*rport
;
1656 unsigned long wait_switch
= 0;
1659 vdev
->dev
.driver_data
= NULL
;
1661 host
= scsi_host_alloc(&driver_template
, sizeof(*hostdata
));
1663 dev_err(&vdev
->dev
, "couldn't allocate host data\n");
1664 goto scsi_host_alloc_failed
;
1667 host
->transportt
= ibmvscsi_transport_template
;
1668 hostdata
= shost_priv(host
);
1669 memset(hostdata
, 0x00, sizeof(*hostdata
));
1670 INIT_LIST_HEAD(&hostdata
->sent
);
1671 hostdata
->host
= host
;
1672 hostdata
->dev
= dev
;
1673 atomic_set(&hostdata
->request_limit
, -1);
1674 hostdata
->host
->max_sectors
= IBMVSCSI_MAX_SECTORS_DEFAULT
;
1676 rc
= ibmvscsi_ops
->init_crq_queue(&hostdata
->queue
, hostdata
, max_events
);
1677 if (rc
!= 0 && rc
!= H_RESOURCE
) {
1678 dev_err(&vdev
->dev
, "couldn't initialize crq. rc=%d\n", rc
);
1679 goto init_crq_failed
;
1681 if (initialize_event_pool(&hostdata
->pool
, max_events
, hostdata
) != 0) {
1682 dev_err(&vdev
->dev
, "couldn't initialize event pool\n");
1683 goto init_pool_failed
;
1687 host
->max_id
= max_id
;
1688 host
->max_channel
= max_channel
;
1690 if (scsi_add_host(hostdata
->host
, hostdata
->dev
))
1691 goto add_host_failed
;
1693 /* we don't have a proper target_port_id so let's use the fake one */
1694 memcpy(ids
.port_id
, hostdata
->madapter_info
.partition_name
,
1695 sizeof(ids
.port_id
));
1696 ids
.roles
= SRP_RPORT_ROLE_TARGET
;
1697 rport
= srp_rport_add(host
, &ids
);
1699 goto add_srp_port_failed
;
1701 /* Try to send an initialization message. Note that this is allowed
1702 * to fail if the other end is not acive. In that case we don't
1705 if (ibmvscsi_ops
->send_crq(hostdata
, 0xC001000000000000LL
, 0) == 0
1706 || rc
== H_RESOURCE
) {
1708 * Wait around max init_timeout secs for the adapter to finish
1709 * initializing. When we are done initializing, we will have a
1710 * valid request_limit. We don't want Linux scanning before
1713 for (wait_switch
= jiffies
+ (init_timeout
* HZ
);
1714 time_before(jiffies
, wait_switch
) &&
1715 atomic_read(&hostdata
->request_limit
) < 2;) {
1720 /* if we now have a valid request_limit, initiate a scan */
1721 if (atomic_read(&hostdata
->request_limit
) > 0)
1722 scsi_scan_host(host
);
1725 vdev
->dev
.driver_data
= hostdata
;
1728 add_srp_port_failed
:
1729 scsi_remove_host(hostdata
->host
);
1731 release_event_pool(&hostdata
->pool
, hostdata
);
1733 ibmvscsi_ops
->release_crq_queue(&hostdata
->queue
, hostdata
, max_events
);
1735 scsi_host_put(host
);
1736 scsi_host_alloc_failed
:
1740 static int ibmvscsi_remove(struct vio_dev
*vdev
)
1742 struct ibmvscsi_host_data
*hostdata
= vdev
->dev
.driver_data
;
1743 release_event_pool(&hostdata
->pool
, hostdata
);
1744 ibmvscsi_ops
->release_crq_queue(&hostdata
->queue
, hostdata
,
1747 srp_remove_host(hostdata
->host
);
1748 scsi_remove_host(hostdata
->host
);
1749 scsi_host_put(hostdata
->host
);
1755 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1758 static struct vio_device_id ibmvscsi_device_table
[] __devinitdata
= {
1759 {"vscsi", "IBM,v-scsi"},
1762 MODULE_DEVICE_TABLE(vio
, ibmvscsi_device_table
);
1764 static struct vio_driver ibmvscsi_driver
= {
1765 .id_table
= ibmvscsi_device_table
,
1766 .probe
= ibmvscsi_probe
,
1767 .remove
= ibmvscsi_remove
,
1768 .get_desired_dma
= ibmvscsi_get_desired_dma
,
1771 .owner
= THIS_MODULE
,
1775 static struct srp_function_template ibmvscsi_transport_functions
= {
1778 int __init
ibmvscsi_module_init(void)
1782 /* Ensure we have two requests to do error recovery */
1783 driver_template
.can_queue
= max_requests
;
1784 max_events
= max_requests
+ 2;
1786 if (firmware_has_feature(FW_FEATURE_ISERIES
))
1787 ibmvscsi_ops
= &iseriesvscsi_ops
;
1788 else if (firmware_has_feature(FW_FEATURE_VIO
))
1789 ibmvscsi_ops
= &rpavscsi_ops
;
1793 ibmvscsi_transport_template
=
1794 srp_attach_transport(&ibmvscsi_transport_functions
);
1795 if (!ibmvscsi_transport_template
)
1798 ret
= vio_register_driver(&ibmvscsi_driver
);
1800 srp_release_transport(ibmvscsi_transport_template
);
1804 void __exit
ibmvscsi_module_exit(void)
1806 vio_unregister_driver(&ibmvscsi_driver
);
1807 srp_release_transport(ibmvscsi_transport_template
);
1810 module_init(ibmvscsi_module_init
);
1811 module_exit(ibmvscsi_module_exit
);