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-rw-r--r--drivers/scsi/ibmvscsi/ibmvscsi.c1473
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diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
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1/* ------------------------------------------------------------
2 * ibmvscsi.c
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)
7 *
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.
12 *
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.
17 *
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
21 * USA
22 *
23 * ------------------------------------------------------------
24 * Emulation of a SCSI host adapter for Virtual I/O devices
25 *
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.
30 *
31 * The virtual adapter(s) are present in the open firmware device
32 * tree just like real adapters.
33 *
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.
38 *
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
47 * the message.
48 *
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
56 * completed.
57 *
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.
63 *
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
66 * layer.
67 */
68
69#include <linux/module.h>
70#include <linux/moduleparam.h>
71#include <linux/dma-mapping.h>
72#include <linux/delay.h>
73#include <asm/vio.h>
74#include <scsi/scsi.h>
75#include <scsi/scsi_cmnd.h>
76#include <scsi/scsi_host.h>
77#include <scsi/scsi_device.h>
78#include "ibmvscsi.h"
79
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
83 * 5 bits of LUN.
84 */
85static int max_id = 64;
86static int max_channel = 3;
87static int init_timeout = 5;
88static int max_requests = 50;
89
90#define IBMVSCSI_VERSION "1.5.5"
91
92MODULE_DESCRIPTION("IBM Virtual SCSI");
93MODULE_AUTHOR("Dave Boutcher");
94MODULE_LICENSE("GPL");
95MODULE_VERSION(IBMVSCSI_VERSION);
96
97module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
98MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
99module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
100MODULE_PARM_DESC(max_channel, "Largest channel value");
101module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
102MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
103module_param_named(max_requests, max_requests, int, S_IRUGO | S_IWUSR);
104MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
105
106/* ------------------------------------------------------------
107 * Routines for the event pool and event structs
108 */
109/**
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
114 *
115 * Returns zero on success.
116*/
117static int initialize_event_pool(struct event_pool *pool,
118 int size, struct ibmvscsi_host_data *hostdata)
119{
120 int i;
121
122 pool->size = size;
123 pool->next = 0;
124 pool->events = kmalloc(pool->size * sizeof(*pool->events), GFP_KERNEL);
125 if (!pool->events)
126 return -ENOMEM;
127 memset(pool->events, 0x00, pool->size * sizeof(*pool->events));
128
129 pool->iu_storage =
130 dma_alloc_coherent(hostdata->dev,
131 pool->size * sizeof(*pool->iu_storage),
132 &pool->iu_token, 0);
133 if (!pool->iu_storage) {
134 kfree(pool->events);
135 return -ENOMEM;
136 }
137
138 for (i = 0; i < pool->size; ++i) {
139 struct srp_event_struct *evt = &pool->events[i];
140 memset(&evt->crq, 0x00, sizeof(evt->crq));
141 atomic_set(&evt->free, 1);
142 evt->crq.valid = 0x80;
143 evt->crq.IU_length = sizeof(*evt->xfer_iu);
144 evt->crq.IU_data_ptr = pool->iu_token +
145 sizeof(*evt->xfer_iu) * i;
146 evt->xfer_iu = pool->iu_storage + i;
147 evt->hostdata = hostdata;
148 }
149
150 return 0;
151}
152
153/**
154 * release_event_pool: - Frees memory of an event pool of a host
155 * @pool: event_pool to be released
156 * @hostdata: ibmvscsi_host_data who owns the even pool
157 *
158 * Returns zero on success.
159*/
160static void release_event_pool(struct event_pool *pool,
161 struct ibmvscsi_host_data *hostdata)
162{
163 int i, in_use = 0;
164 for (i = 0; i < pool->size; ++i)
165 if (atomic_read(&pool->events[i].free) != 1)
166 ++in_use;
167 if (in_use)
168 printk(KERN_WARNING
169 "ibmvscsi: releasing event pool with %d "
170 "events still in use?\n", in_use);
171 kfree(pool->events);
172 dma_free_coherent(hostdata->dev,
173 pool->size * sizeof(*pool->iu_storage),
174 pool->iu_storage, pool->iu_token);
175}
176
177/**
178 * valid_event_struct: - Determines if event is valid.
179 * @pool: event_pool that contains the event
180 * @evt: srp_event_struct to be checked for validity
181 *
182 * Returns zero if event is invalid, one otherwise.
183*/
184static int valid_event_struct(struct event_pool *pool,
185 struct srp_event_struct *evt)
186{
187 int index = evt - pool->events;
188 if (index < 0 || index >= pool->size) /* outside of bounds */
189 return 0;
190 if (evt != pool->events + index) /* unaligned */
191 return 0;
192 return 1;
193}
194
195/**
196 * ibmvscsi_free-event_struct: - Changes status of event to "free"
197 * @pool: event_pool that contains the event
198 * @evt: srp_event_struct to be modified
199 *
200*/
201static void free_event_struct(struct event_pool *pool,
202 struct srp_event_struct *evt)
203{
204 if (!valid_event_struct(pool, evt)) {
205 printk(KERN_ERR
206 "ibmvscsi: Freeing invalid event_struct %p "
207 "(not in pool %p)\n", evt, pool->events);
208 return;
209 }
210 if (atomic_inc_return(&evt->free) != 1) {
211 printk(KERN_ERR
212 "ibmvscsi: Freeing event_struct %p "
213 "which is not in use!\n", evt);
214 return;
215 }
216}
217
218/**
219 * get_evt_struct: - Gets the next free event in pool
220 * @pool: event_pool that contains the events to be searched
221 *
222 * Returns the next event in "free" state, and NULL if none are free.
223 * Note that no synchronization is done here, we assume the host_lock
224 * will syncrhonze things.
225*/
226static struct srp_event_struct *get_event_struct(struct event_pool *pool)
227{
228 int i;
229 int poolsize = pool->size;
230 int offset = pool->next;
231
232 for (i = 0; i < poolsize; i++) {
233 offset = (offset + 1) % poolsize;
234 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
235 pool->next = offset;
236 return &pool->events[offset];
237 }
238 }
239
240 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
241 return NULL;
242}
243
244/**
245 * init_event_struct: Initialize fields in an event struct that are always
246 * required.
247 * @evt: The event
248 * @done: Routine to call when the event is responded to
249 * @format: SRP or MAD format
250 * @timeout: timeout value set in the CRQ
251 */
252static void init_event_struct(struct srp_event_struct *evt_struct,
253 void (*done) (struct srp_event_struct *),
254 u8 format,
255 int timeout)
256{
257 evt_struct->cmnd = NULL;
258 evt_struct->cmnd_done = NULL;
259 evt_struct->sync_srp = NULL;
260 evt_struct->crq.format = format;
261 evt_struct->crq.timeout = timeout;
262 evt_struct->done = done;
263}
264
265/* ------------------------------------------------------------
266 * Routines for receiving SCSI responses from the hosting partition
267 */
268
269/**
270 * set_srp_direction: Set the fields in the srp related to data
271 * direction and number of buffers based on the direction in
272 * the scsi_cmnd and the number of buffers
273 */
274static void set_srp_direction(struct scsi_cmnd *cmd,
275 struct srp_cmd *srp_cmd,
276 int numbuf)
277{
278 if (numbuf == 0)
279 return;
280
281 if (numbuf == 1) {
282 if (cmd->sc_data_direction == DMA_TO_DEVICE)
283 srp_cmd->data_out_format = SRP_DIRECT_BUFFER;
284 else
285 srp_cmd->data_in_format = SRP_DIRECT_BUFFER;
286 } else {
287 if (cmd->sc_data_direction == DMA_TO_DEVICE) {
288 srp_cmd->data_out_format = SRP_INDIRECT_BUFFER;
289 srp_cmd->data_out_count = numbuf;
290 } else {
291 srp_cmd->data_in_format = SRP_INDIRECT_BUFFER;
292 srp_cmd->data_in_count = numbuf;
293 }
294 }
295}
296
297/**
298 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
299 * @cmd: srp_cmd whose additional_data member will be unmapped
300 * @dev: device for which the memory is mapped
301 *
302*/
303static void unmap_cmd_data(struct srp_cmd *cmd, struct device *dev)
304{
305 int i;
306
307 if ((cmd->data_out_format == SRP_NO_BUFFER) &&
308 (cmd->data_in_format == SRP_NO_BUFFER))
309 return;
310 else if ((cmd->data_out_format == SRP_DIRECT_BUFFER) ||
311 (cmd->data_in_format == SRP_DIRECT_BUFFER)) {
312 struct memory_descriptor *data =
313 (struct memory_descriptor *)cmd->additional_data;
314 dma_unmap_single(dev, data->virtual_address, data->length,
315 DMA_BIDIRECTIONAL);
316 } else {
317 struct indirect_descriptor *indirect =
318 (struct indirect_descriptor *)cmd->additional_data;
319 int num_mapped = indirect->head.length /
320 sizeof(indirect->list[0]);
321 for (i = 0; i < num_mapped; ++i) {
322 struct memory_descriptor *data = &indirect->list[i];
323 dma_unmap_single(dev,
324 data->virtual_address,
325 data->length, DMA_BIDIRECTIONAL);
326 }
327 }
328}
329
330/**
331 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
332 * @cmd: Scsi_Cmnd with the scatterlist
333 * @srp_cmd: srp_cmd that contains the memory descriptor
334 * @dev: device for which to map dma memory
335 *
336 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
337 * Returns 1 on success.
338*/
339static int map_sg_data(struct scsi_cmnd *cmd,
340 struct srp_cmd *srp_cmd, struct device *dev)
341{
342
343 int i, sg_mapped;
344 u64 total_length = 0;
345 struct scatterlist *sg = cmd->request_buffer;
346 struct memory_descriptor *data =
347 (struct memory_descriptor *)srp_cmd->additional_data;
348 struct indirect_descriptor *indirect =
349 (struct indirect_descriptor *)data;
350
351 sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL);
352
353 if (sg_mapped == 0)
354 return 0;
355
356 set_srp_direction(cmd, srp_cmd, sg_mapped);
357
358 /* special case; we can use a single direct descriptor */
359 if (sg_mapped == 1) {
360 data->virtual_address = sg_dma_address(&sg[0]);
361 data->length = sg_dma_len(&sg[0]);
362 data->memory_handle = 0;
363 return 1;
364 }
365
366 if (sg_mapped > MAX_INDIRECT_BUFS) {
367 printk(KERN_ERR
368 "ibmvscsi: More than %d mapped sg entries, got %d\n",
369 MAX_INDIRECT_BUFS, sg_mapped);
370 return 0;
371 }
372
373 indirect->head.virtual_address = 0;
374 indirect->head.length = sg_mapped * sizeof(indirect->list[0]);
375 indirect->head.memory_handle = 0;
376 for (i = 0; i < sg_mapped; ++i) {
377 struct memory_descriptor *descr = &indirect->list[i];
378 struct scatterlist *sg_entry = &sg[i];
379 descr->virtual_address = sg_dma_address(sg_entry);
380 descr->length = sg_dma_len(sg_entry);
381 descr->memory_handle = 0;
382 total_length += sg_dma_len(sg_entry);
383 }
384 indirect->total_length = total_length;
385
386 return 1;
387}
388
389/**
390 * map_single_data: - Maps memory and initializes memory decriptor fields
391 * @cmd: struct scsi_cmnd with the memory to be mapped
392 * @srp_cmd: srp_cmd that contains the memory descriptor
393 * @dev: device for which to map dma memory
394 *
395 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
396 * Returns 1 on success.
397*/
398static int map_single_data(struct scsi_cmnd *cmd,
399 struct srp_cmd *srp_cmd, struct device *dev)
400{
401 struct memory_descriptor *data =
402 (struct memory_descriptor *)srp_cmd->additional_data;
403
404 data->virtual_address =
405 dma_map_single(dev, cmd->request_buffer,
406 cmd->request_bufflen,
407 DMA_BIDIRECTIONAL);
408 if (dma_mapping_error(data->virtual_address)) {
409 printk(KERN_ERR
410 "ibmvscsi: Unable to map request_buffer for command!\n");
411 return 0;
412 }
413 data->length = cmd->request_bufflen;
414 data->memory_handle = 0;
415
416 set_srp_direction(cmd, srp_cmd, 1);
417
418 return 1;
419}
420
421/**
422 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
423 * @cmd: struct scsi_cmnd with the memory to be mapped
424 * @srp_cmd: srp_cmd that contains the memory descriptor
425 * @dev: dma device for which to map dma memory
426 *
427 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
428 * Returns 1 on success.
429*/
430static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
431 struct srp_cmd *srp_cmd, struct device *dev)
432{
433 switch (cmd->sc_data_direction) {
434 case DMA_FROM_DEVICE:
435 case DMA_TO_DEVICE:
436 break;
437 case DMA_NONE:
438 return 1;
439 case DMA_BIDIRECTIONAL:
440 printk(KERN_ERR
441 "ibmvscsi: Can't map DMA_BIDIRECTIONAL to read/write\n");
442 return 0;
443 default:
444 printk(KERN_ERR
445 "ibmvscsi: Unknown data direction 0x%02x; can't map!\n",
446 cmd->sc_data_direction);
447 return 0;
448 }
449
450 if (!cmd->request_buffer)
451 return 1;
452 if (cmd->use_sg)
453 return map_sg_data(cmd, srp_cmd, dev);
454 return map_single_data(cmd, srp_cmd, dev);
455}
456
457/* ------------------------------------------------------------
458 * Routines for sending and receiving SRPs
459 */
460/**
461 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
462 * @evt_struct: evt_struct to be sent
463 * @hostdata: ibmvscsi_host_data of host
464 *
465 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
466 * Note that this routine assumes that host_lock is held for synchronization
467*/
468static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
469 struct ibmvscsi_host_data *hostdata)
470{
471 struct scsi_cmnd *cmnd;
472 u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
473 int rc;
474
475 /* If we have exhausted our request limit, just fail this request.
476 * Note that there are rare cases involving driver generated requests
477 * (such as task management requests) that the mid layer may think we
478 * can handle more requests (can_queue) when we actually can't
479 */
480 if ((evt_struct->crq.format == VIOSRP_SRP_FORMAT) &&
481 (atomic_dec_if_positive(&hostdata->request_limit) < 0)) {
482 /* See if the adapter is disabled */
483 if (atomic_read(&hostdata->request_limit) < 0)
484 goto send_error;
485
486 printk(KERN_WARNING
487 "ibmvscsi: Warning, request_limit exceeded\n");
488 unmap_cmd_data(&evt_struct->iu.srp.cmd,
489 hostdata->dev);
490 free_event_struct(&hostdata->pool, evt_struct);
491 return SCSI_MLQUEUE_HOST_BUSY;
492 }
493
494 /* Copy the IU into the transfer area */
495 *evt_struct->xfer_iu = evt_struct->iu;
496 evt_struct->xfer_iu->srp.generic.tag = (u64)evt_struct;
497
498 /* Add this to the sent list. We need to do this
499 * before we actually send
500 * in case it comes back REALLY fast
501 */
502 list_add_tail(&evt_struct->list, &hostdata->sent);
503
504 if ((rc =
505 ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
506 list_del(&evt_struct->list);
507
508 printk(KERN_ERR "ibmvscsi: failed to send event struct rc %d\n",
509 rc);
510 goto send_error;
511 }
512
513 return 0;
514
515 send_error:
516 unmap_cmd_data(&evt_struct->iu.srp.cmd, hostdata->dev);
517
518 if ((cmnd = evt_struct->cmnd) != NULL) {
519 cmnd->result = DID_ERROR << 16;
520 evt_struct->cmnd_done(cmnd);
521 } else if (evt_struct->done)
522 evt_struct->done(evt_struct);
523
524 free_event_struct(&hostdata->pool, evt_struct);
525 return 0;
526}
527
528/**
529 * handle_cmd_rsp: - Handle responses from commands
530 * @evt_struct: srp_event_struct to be handled
531 *
532 * Used as a callback by when sending scsi cmds.
533 * Gets called by ibmvscsi_handle_crq()
534*/
535static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
536{
537 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
538 struct scsi_cmnd *cmnd = evt_struct->cmnd;
539
540 if (unlikely(rsp->type != SRP_RSP_TYPE)) {
541 if (printk_ratelimit())
542 printk(KERN_WARNING
543 "ibmvscsi: bad SRP RSP type %d\n",
544 rsp->type);
545 }
546
547 if (cmnd) {
548 cmnd->result = rsp->status;
549 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
550 memcpy(cmnd->sense_buffer,
551 rsp->sense_and_response_data,
552 rsp->sense_data_list_length);
553 unmap_cmd_data(&evt_struct->iu.srp.cmd,
554 evt_struct->hostdata->dev);
555
556 if (rsp->doover)
557 cmnd->resid = rsp->data_out_residual_count;
558 else if (rsp->diover)
559 cmnd->resid = rsp->data_in_residual_count;
560 }
561
562 if (evt_struct->cmnd_done)
563 evt_struct->cmnd_done(cmnd);
564}
565
566/**
567 * lun_from_dev: - Returns the lun of the scsi device
568 * @dev: struct scsi_device
569 *
570*/
571static inline u16 lun_from_dev(struct scsi_device *dev)
572{
573 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
574}
575
576/**
577 * ibmvscsi_queue: - The queuecommand function of the scsi template
578 * @cmd: struct scsi_cmnd to be executed
579 * @done: Callback function to be called when cmd is completed
580*/
581static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
582 void (*done) (struct scsi_cmnd *))
583{
584 struct srp_cmd *srp_cmd;
585 struct srp_event_struct *evt_struct;
586 struct ibmvscsi_host_data *hostdata =
587 (struct ibmvscsi_host_data *)&cmnd->device->host->hostdata;
588 u16 lun = lun_from_dev(cmnd->device);
589
590 evt_struct = get_event_struct(&hostdata->pool);
591 if (!evt_struct)
592 return SCSI_MLQUEUE_HOST_BUSY;
593
594 init_event_struct(evt_struct,
595 handle_cmd_rsp,
596 VIOSRP_SRP_FORMAT,
597 cmnd->timeout);
598
599 evt_struct->cmnd = cmnd;
600 evt_struct->cmnd_done = done;
601
602 /* Set up the actual SRP IU */
603 srp_cmd = &evt_struct->iu.srp.cmd;
604 memset(srp_cmd, 0x00, sizeof(*srp_cmd));
605 srp_cmd->type = SRP_CMD_TYPE;
606 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd));
607 srp_cmd->lun = ((u64) lun) << 48;
608
609 if (!map_data_for_srp_cmd(cmnd, srp_cmd, hostdata->dev)) {
610 printk(KERN_ERR "ibmvscsi: couldn't convert cmd to srp_cmd\n");
611 free_event_struct(&hostdata->pool, evt_struct);
612 return SCSI_MLQUEUE_HOST_BUSY;
613 }
614
615 /* Fix up dma address of the buffer itself */
616 if ((srp_cmd->data_out_format == SRP_INDIRECT_BUFFER) ||
617 (srp_cmd->data_in_format == SRP_INDIRECT_BUFFER)) {
618 struct indirect_descriptor *indirect =
619 (struct indirect_descriptor *)srp_cmd->additional_data;
620 indirect->head.virtual_address = evt_struct->crq.IU_data_ptr +
621 offsetof(struct srp_cmd, additional_data) +
622 offsetof(struct indirect_descriptor, list);
623 }
624
625 return ibmvscsi_send_srp_event(evt_struct, hostdata);
626}
627
628/* ------------------------------------------------------------
629 * Routines for driver initialization
630 */
631/**
632 * adapter_info_rsp: - Handle response to MAD adapter info request
633 * @evt_struct: srp_event_struct with the response
634 *
635 * Used as a "done" callback by when sending adapter_info. Gets called
636 * by ibmvscsi_handle_crq()
637*/
638static void adapter_info_rsp(struct srp_event_struct *evt_struct)
639{
640 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
641 dma_unmap_single(hostdata->dev,
642 evt_struct->iu.mad.adapter_info.buffer,
643 evt_struct->iu.mad.adapter_info.common.length,
644 DMA_BIDIRECTIONAL);
645
646 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
647 printk("ibmvscsi: error %d getting adapter info\n",
648 evt_struct->xfer_iu->mad.adapter_info.common.status);
649 } else {
650 printk("ibmvscsi: host srp version: %s, "
651 "host partition %s (%d), OS %d, max io %u\n",
652 hostdata->madapter_info.srp_version,
653 hostdata->madapter_info.partition_name,
654 hostdata->madapter_info.partition_number,
655 hostdata->madapter_info.os_type,
656 hostdata->madapter_info.port_max_txu[0]);
657
658 if (hostdata->madapter_info.port_max_txu[0])
659 hostdata->host->max_sectors =
660 hostdata->madapter_info.port_max_txu[0] >> 9;
661 }
662}
663
664/**
665 * send_mad_adapter_info: - Sends the mad adapter info request
666 * and stores the result so it can be retrieved with
667 * sysfs. We COULD consider causing a failure if the
668 * returned SRP version doesn't match ours.
669 * @hostdata: ibmvscsi_host_data of host
670 *
671 * Returns zero if successful.
672*/
673static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
674{
675 struct viosrp_adapter_info *req;
676 struct srp_event_struct *evt_struct;
677
678 memset(&hostdata->madapter_info, 0x00, sizeof(hostdata->madapter_info));
679
680 evt_struct = get_event_struct(&hostdata->pool);
681 if (!evt_struct) {
682 printk(KERN_ERR "ibmvscsi: couldn't allocate an event "
683 "for ADAPTER_INFO_REQ!\n");
684 return;
685 }
686
687 init_event_struct(evt_struct,
688 adapter_info_rsp,
689 VIOSRP_MAD_FORMAT,
690 init_timeout * HZ);
691
692 req = &evt_struct->iu.mad.adapter_info;
693 memset(req, 0x00, sizeof(*req));
694
695 req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
696 req->common.length = sizeof(hostdata->madapter_info);
697 req->buffer = dma_map_single(hostdata->dev,
698 &hostdata->madapter_info,
699 sizeof(hostdata->madapter_info),
700 DMA_BIDIRECTIONAL);
701
702 if (dma_mapping_error(req->buffer)) {
703 printk(KERN_ERR
704 "ibmvscsi: Unable to map request_buffer "
705 "for adapter_info!\n");
706 free_event_struct(&hostdata->pool, evt_struct);
707 return;
708 }
709
710 if (ibmvscsi_send_srp_event(evt_struct, hostdata))
711 printk(KERN_ERR "ibmvscsi: couldn't send ADAPTER_INFO_REQ!\n");
712};
713
714/**
715 * login_rsp: - Handle response to SRP login request
716 * @evt_struct: srp_event_struct with the response
717 *
718 * Used as a "done" callback by when sending srp_login. Gets called
719 * by ibmvscsi_handle_crq()
720*/
721static void login_rsp(struct srp_event_struct *evt_struct)
722{
723 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
724 switch (evt_struct->xfer_iu->srp.generic.type) {
725 case SRP_LOGIN_RSP_TYPE: /* it worked! */
726 break;
727 case SRP_LOGIN_REJ_TYPE: /* refused! */
728 printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REQ rejected\n");
729 /* Login failed. */
730 atomic_set(&hostdata->request_limit, -1);
731 return;
732 default:
733 printk(KERN_ERR
734 "ibmvscsi: Invalid login response typecode 0x%02x!\n",
735 evt_struct->xfer_iu->srp.generic.type);
736 /* Login failed. */
737 atomic_set(&hostdata->request_limit, -1);
738 return;
739 }
740
741 printk(KERN_INFO "ibmvscsi: SRP_LOGIN succeeded\n");
742
743 if (evt_struct->xfer_iu->srp.login_rsp.request_limit_delta >
744 (max_requests - 2))
745 evt_struct->xfer_iu->srp.login_rsp.request_limit_delta =
746 max_requests - 2;
747
748 /* Now we know what the real request-limit is */
749 atomic_set(&hostdata->request_limit,
750 evt_struct->xfer_iu->srp.login_rsp.request_limit_delta);
751
752 hostdata->host->can_queue =
753 evt_struct->xfer_iu->srp.login_rsp.request_limit_delta - 2;
754
755 if (hostdata->host->can_queue < 1) {
756 printk(KERN_ERR "ibmvscsi: Invalid request_limit_delta\n");
757 return;
758 }
759
760 send_mad_adapter_info(hostdata);
761 return;
762}
763
764/**
765 * send_srp_login: - Sends the srp login
766 * @hostdata: ibmvscsi_host_data of host
767 *
768 * Returns zero if successful.
769*/
770static int send_srp_login(struct ibmvscsi_host_data *hostdata)
771{
772 int rc;
773 unsigned long flags;
774 struct srp_login_req *login;
775 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
776 if (!evt_struct) {
777 printk(KERN_ERR
778 "ibmvscsi: couldn't allocate an event for login req!\n");
779 return FAILED;
780 }
781
782 init_event_struct(evt_struct,
783 login_rsp,
784 VIOSRP_SRP_FORMAT,
785 init_timeout * HZ);
786
787 login = &evt_struct->iu.srp.login_req;
788 login->type = SRP_LOGIN_REQ_TYPE;
789 login->max_requested_initiator_to_target_iulen = sizeof(union srp_iu);
790 login->required_buffer_formats = 0x0006;
791
792 /* Start out with a request limit of 1, since this is negotiated in
793 * the login request we are just sending
794 */
795 atomic_set(&hostdata->request_limit, 1);
796
797 spin_lock_irqsave(hostdata->host->host_lock, flags);
798 rc = ibmvscsi_send_srp_event(evt_struct, hostdata);
799 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
800 return rc;
801};
802
803/**
804 * sync_completion: Signal that a synchronous command has completed
805 * Note that after returning from this call, the evt_struct is freed.
806 * the caller waiting on this completion shouldn't touch the evt_struct
807 * again.
808 */
809static void sync_completion(struct srp_event_struct *evt_struct)
810{
811 /* copy the response back */
812 if (evt_struct->sync_srp)
813 *evt_struct->sync_srp = *evt_struct->xfer_iu;
814
815 complete(&evt_struct->comp);
816}
817
818/**
819 * ibmvscsi_abort: Abort a command...from scsi host template
820 * send this over to the server and wait synchronously for the response
821 */
822static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
823{
824 struct ibmvscsi_host_data *hostdata =
825 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
826 struct srp_tsk_mgmt *tsk_mgmt;
827 struct srp_event_struct *evt;
828 struct srp_event_struct *tmp_evt, *found_evt;
829 union viosrp_iu srp_rsp;
830 int rsp_rc;
831 u16 lun = lun_from_dev(cmd->device);
832
833 /* First, find this command in our sent list so we can figure
834 * out the correct tag
835 */
836 found_evt = NULL;
837 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
838 if (tmp_evt->cmnd == cmd) {
839 found_evt = tmp_evt;
840 break;
841 }
842 }
843
844 if (!found_evt)
845 return FAILED;
846
847 evt = get_event_struct(&hostdata->pool);
848 if (evt == NULL) {
849 printk(KERN_ERR "ibmvscsi: failed to allocate abort event\n");
850 return FAILED;
851 }
852
853 init_event_struct(evt,
854 sync_completion,
855 VIOSRP_SRP_FORMAT,
856 init_timeout * HZ);
857
858 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
859
860 /* Set up an abort SRP command */
861 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
862 tsk_mgmt->type = SRP_TSK_MGMT_TYPE;
863 tsk_mgmt->lun = ((u64) lun) << 48;
864 tsk_mgmt->task_mgmt_flags = 0x01; /* ABORT TASK */
865 tsk_mgmt->managed_task_tag = (u64) found_evt;
866
867 printk(KERN_INFO "ibmvscsi: aborting command. lun 0x%lx, tag 0x%lx\n",
868 tsk_mgmt->lun, tsk_mgmt->managed_task_tag);
869
870 evt->sync_srp = &srp_rsp;
871 init_completion(&evt->comp);
872 if (ibmvscsi_send_srp_event(evt, hostdata) != 0) {
873 printk(KERN_ERR "ibmvscsi: failed to send abort() event\n");
874 return FAILED;
875 }
876
877 spin_unlock_irq(hostdata->host->host_lock);
878 wait_for_completion(&evt->comp);
879 spin_lock_irq(hostdata->host->host_lock);
880
881 /* make sure we got a good response */
882 if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) {
883 if (printk_ratelimit())
884 printk(KERN_WARNING
885 "ibmvscsi: abort bad SRP RSP type %d\n",
886 srp_rsp.srp.generic.type);
887 return FAILED;
888 }
889
890 if (srp_rsp.srp.rsp.rspvalid)
891 rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data);
892 else
893 rsp_rc = srp_rsp.srp.rsp.status;
894
895 if (rsp_rc) {
896 if (printk_ratelimit())
897 printk(KERN_WARNING
898 "ibmvscsi: abort code %d for task tag 0x%lx\n",
899 rsp_rc,
900 tsk_mgmt->managed_task_tag);
901 return FAILED;
902 }
903
904 /* Because we dropped the spinlock above, it's possible
905 * The event is no longer in our list. Make sure it didn't
906 * complete while we were aborting
907 */
908 found_evt = NULL;
909 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
910 if (tmp_evt->cmnd == cmd) {
911 found_evt = tmp_evt;
912 break;
913 }
914 }
915
916 if (found_evt == NULL) {
917 printk(KERN_INFO
918 "ibmvscsi: aborted task tag 0x%lx completed\n",
919 tsk_mgmt->managed_task_tag);
920 return SUCCESS;
921 }
922
923 printk(KERN_INFO
924 "ibmvscsi: successfully aborted task tag 0x%lx\n",
925 tsk_mgmt->managed_task_tag);
926
927 cmd->result = (DID_ABORT << 16);
928 list_del(&found_evt->list);
929 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt->hostdata->dev);
930 free_event_struct(&found_evt->hostdata->pool, found_evt);
931 atomic_inc(&hostdata->request_limit);
932 return SUCCESS;
933}
934
935/**
936 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
937 * template send this over to the server and wait synchronously for the
938 * response
939 */
940static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
941{
942 struct ibmvscsi_host_data *hostdata =
943 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
944
945 struct srp_tsk_mgmt *tsk_mgmt;
946 struct srp_event_struct *evt;
947 struct srp_event_struct *tmp_evt, *pos;
948 union viosrp_iu srp_rsp;
949 int rsp_rc;
950 u16 lun = lun_from_dev(cmd->device);
951
952 evt = get_event_struct(&hostdata->pool);
953 if (evt == NULL) {
954 printk(KERN_ERR "ibmvscsi: failed to allocate reset event\n");
955 return FAILED;
956 }
957
958 init_event_struct(evt,
959 sync_completion,
960 VIOSRP_SRP_FORMAT,
961 init_timeout * HZ);
962
963 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
964
965 /* Set up a lun reset SRP command */
966 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
967 tsk_mgmt->type = SRP_TSK_MGMT_TYPE;
968 tsk_mgmt->lun = ((u64) lun) << 48;
969 tsk_mgmt->task_mgmt_flags = 0x08; /* LUN RESET */
970
971 printk(KERN_INFO "ibmvscsi: resetting device. lun 0x%lx\n",
972 tsk_mgmt->lun);
973
974 evt->sync_srp = &srp_rsp;
975 init_completion(&evt->comp);
976 if (ibmvscsi_send_srp_event(evt, hostdata) != 0) {
977 printk(KERN_ERR "ibmvscsi: failed to send reset event\n");
978 return FAILED;
979 }
980
981 spin_unlock_irq(hostdata->host->host_lock);
982 wait_for_completion(&evt->comp);
983 spin_lock_irq(hostdata->host->host_lock);
984
985 /* make sure we got a good response */
986 if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) {
987 if (printk_ratelimit())
988 printk(KERN_WARNING
989 "ibmvscsi: reset bad SRP RSP type %d\n",
990 srp_rsp.srp.generic.type);
991 return FAILED;
992 }
993
994 if (srp_rsp.srp.rsp.rspvalid)
995 rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data);
996 else
997 rsp_rc = srp_rsp.srp.rsp.status;
998
999 if (rsp_rc) {
1000 if (printk_ratelimit())
1001 printk(KERN_WARNING
1002 "ibmvscsi: reset code %d for task tag 0x%lx\n",
1003 rsp_rc,
1004 tsk_mgmt->managed_task_tag);
1005 return FAILED;
1006 }
1007
1008 /* We need to find all commands for this LUN that have not yet been
1009 * responded to, and fail them with DID_RESET
1010 */
1011 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1012 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1013 if (tmp_evt->cmnd)
1014 tmp_evt->cmnd->result = (DID_RESET << 16);
1015 list_del(&tmp_evt->list);
1016 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt->hostdata->dev);
1017 free_event_struct(&tmp_evt->hostdata->pool,
1018 tmp_evt);
1019 atomic_inc(&hostdata->request_limit);
1020 if (tmp_evt->cmnd_done)
1021 tmp_evt->cmnd_done(tmp_evt->cmnd);
1022 else if (tmp_evt->done)
1023 tmp_evt->done(tmp_evt);
1024 }
1025 }
1026 return SUCCESS;
1027}
1028
1029/**
1030 * purge_requests: Our virtual adapter just shut down. purge any sent requests
1031 * @hostdata: the adapter
1032 */
1033static void purge_requests(struct ibmvscsi_host_data *hostdata)
1034{
1035 struct srp_event_struct *tmp_evt, *pos;
1036 unsigned long flags;
1037
1038 spin_lock_irqsave(hostdata->host->host_lock, flags);
1039 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1040 list_del(&tmp_evt->list);
1041 if (tmp_evt->cmnd) {
1042 tmp_evt->cmnd->result = (DID_ERROR << 16);
1043 unmap_cmd_data(&tmp_evt->iu.srp.cmd,
1044 tmp_evt->hostdata->dev);
1045 if (tmp_evt->cmnd_done)
1046 tmp_evt->cmnd_done(tmp_evt->cmnd);
1047 } else {
1048 if (tmp_evt->done) {
1049 tmp_evt->done(tmp_evt);
1050 }
1051 }
1052 free_event_struct(&tmp_evt->hostdata->pool, tmp_evt);
1053 }
1054 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1055}
1056
1057/**
1058 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1059 * @crq: Command/Response queue
1060 * @hostdata: ibmvscsi_host_data of host
1061 *
1062*/
1063void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1064 struct ibmvscsi_host_data *hostdata)
1065{
1066 unsigned long flags;
1067 struct srp_event_struct *evt_struct =
1068 (struct srp_event_struct *)crq->IU_data_ptr;
1069 switch (crq->valid) {
1070 case 0xC0: /* initialization */
1071 switch (crq->format) {
1072 case 0x01: /* Initialization message */
1073 printk(KERN_INFO "ibmvscsi: partner initialized\n");
1074 /* Send back a response */
1075 if (ibmvscsi_send_crq(hostdata,
1076 0xC002000000000000LL, 0) == 0) {
1077 /* Now login */
1078 send_srp_login(hostdata);
1079 } else {
1080 printk(KERN_ERR
1081 "ibmvscsi: Unable to send init rsp\n");
1082 }
1083
1084 break;
1085 case 0x02: /* Initialization response */
1086 printk(KERN_INFO
1087 "ibmvscsi: partner initialization complete\n");
1088
1089 /* Now login */
1090 send_srp_login(hostdata);
1091 break;
1092 default:
1093 printk(KERN_ERR "ibmvscsi: unknown crq message type\n");
1094 }
1095 return;
1096 case 0xFF: /* Hypervisor telling us the connection is closed */
1097 printk(KERN_INFO "ibmvscsi: Virtual adapter failed!\n");
1098
1099 atomic_set(&hostdata->request_limit, -1);
1100 purge_requests(hostdata);
1101 ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
1102 return;
1103 case 0x80: /* real payload */
1104 break;
1105 default:
1106 printk(KERN_ERR
1107 "ibmvscsi: got an invalid message type 0x%02x\n",
1108 crq->valid);
1109 return;
1110 }
1111
1112 /* The only kind of payload CRQs we should get are responses to
1113 * things we send. Make sure this response is to something we
1114 * actually sent
1115 */
1116 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1117 printk(KERN_ERR
1118 "ibmvscsi: returned correlation_token 0x%p is invalid!\n",
1119 (void *)crq->IU_data_ptr);
1120 return;
1121 }
1122
1123 if (atomic_read(&evt_struct->free)) {
1124 printk(KERN_ERR
1125 "ibmvscsi: received duplicate correlation_token 0x%p!\n",
1126 (void *)crq->IU_data_ptr);
1127 return;
1128 }
1129
1130 if (crq->format == VIOSRP_SRP_FORMAT)
1131 atomic_add(evt_struct->xfer_iu->srp.rsp.request_limit_delta,
1132 &hostdata->request_limit);
1133
1134 if (evt_struct->done)
1135 evt_struct->done(evt_struct);
1136 else
1137 printk(KERN_ERR
1138 "ibmvscsi: returned done() is NULL; not running it!\n");
1139
1140 /*
1141 * Lock the host_lock before messing with these structures, since we
1142 * are running in a task context
1143 */
1144 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1145 list_del(&evt_struct->list);
1146 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1147 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1148}
1149
1150/**
1151 * ibmvscsi_get_host_config: Send the command to the server to get host
1152 * configuration data. The data is opaque to us.
1153 */
1154static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1155 unsigned char *buffer, int length)
1156{
1157 struct viosrp_host_config *host_config;
1158 struct srp_event_struct *evt_struct;
1159 int rc;
1160
1161 evt_struct = get_event_struct(&hostdata->pool);
1162 if (!evt_struct) {
1163 printk(KERN_ERR
1164 "ibmvscsi: could't allocate event for HOST_CONFIG!\n");
1165 return -1;
1166 }
1167
1168 init_event_struct(evt_struct,
1169 sync_completion,
1170 VIOSRP_MAD_FORMAT,
1171 init_timeout * HZ);
1172
1173 host_config = &evt_struct->iu.mad.host_config;
1174
1175 /* Set up a lun reset SRP command */
1176 memset(host_config, 0x00, sizeof(*host_config));
1177 host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1178 host_config->common.length = length;
1179 host_config->buffer = dma_map_single(hostdata->dev, buffer, length,
1180 DMA_BIDIRECTIONAL);
1181
1182 if (dma_mapping_error(host_config->buffer)) {
1183 printk(KERN_ERR
1184 "ibmvscsi: dma_mapping error " "getting host config\n");
1185 free_event_struct(&hostdata->pool, evt_struct);
1186 return -1;
1187 }
1188
1189 init_completion(&evt_struct->comp);
1190 rc = ibmvscsi_send_srp_event(evt_struct, hostdata);
1191 if (rc == 0) {
1192 wait_for_completion(&evt_struct->comp);
1193 dma_unmap_single(hostdata->dev, host_config->buffer,
1194 length, DMA_BIDIRECTIONAL);
1195 }
1196
1197 return rc;
1198}
1199
1200/* ------------------------------------------------------------
1201 * sysfs attributes
1202 */
1203static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf)
1204{
1205 struct Scsi_Host *shost = class_to_shost(class_dev);
1206 struct ibmvscsi_host_data *hostdata =
1207 (struct ibmvscsi_host_data *)shost->hostdata;
1208 int len;
1209
1210 len = snprintf(buf, PAGE_SIZE, "%s\n",
1211 hostdata->madapter_info.srp_version);
1212 return len;
1213}
1214
1215static struct class_device_attribute ibmvscsi_host_srp_version = {
1216 .attr = {
1217 .name = "srp_version",
1218 .mode = S_IRUGO,
1219 },
1220 .show = show_host_srp_version,
1221};
1222
1223static ssize_t show_host_partition_name(struct class_device *class_dev,
1224 char *buf)
1225{
1226 struct Scsi_Host *shost = class_to_shost(class_dev);
1227 struct ibmvscsi_host_data *hostdata =
1228 (struct ibmvscsi_host_data *)shost->hostdata;
1229 int len;
1230
1231 len = snprintf(buf, PAGE_SIZE, "%s\n",
1232 hostdata->madapter_info.partition_name);
1233 return len;
1234}
1235
1236static struct class_device_attribute ibmvscsi_host_partition_name = {
1237 .attr = {
1238 .name = "partition_name",
1239 .mode = S_IRUGO,
1240 },
1241 .show = show_host_partition_name,
1242};
1243
1244static ssize_t show_host_partition_number(struct class_device *class_dev,
1245 char *buf)
1246{
1247 struct Scsi_Host *shost = class_to_shost(class_dev);
1248 struct ibmvscsi_host_data *hostdata =
1249 (struct ibmvscsi_host_data *)shost->hostdata;
1250 int len;
1251
1252 len = snprintf(buf, PAGE_SIZE, "%d\n",
1253 hostdata->madapter_info.partition_number);
1254 return len;
1255}
1256
1257static struct class_device_attribute ibmvscsi_host_partition_number = {
1258 .attr = {
1259 .name = "partition_number",
1260 .mode = S_IRUGO,
1261 },
1262 .show = show_host_partition_number,
1263};
1264
1265static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf)
1266{
1267 struct Scsi_Host *shost = class_to_shost(class_dev);
1268 struct ibmvscsi_host_data *hostdata =
1269 (struct ibmvscsi_host_data *)shost->hostdata;
1270 int len;
1271
1272 len = snprintf(buf, PAGE_SIZE, "%d\n",
1273 hostdata->madapter_info.mad_version);
1274 return len;
1275}
1276
1277static struct class_device_attribute ibmvscsi_host_mad_version = {
1278 .attr = {
1279 .name = "mad_version",
1280 .mode = S_IRUGO,
1281 },
1282 .show = show_host_mad_version,
1283};
1284
1285static ssize_t show_host_os_type(struct class_device *class_dev, char *buf)
1286{
1287 struct Scsi_Host *shost = class_to_shost(class_dev);
1288 struct ibmvscsi_host_data *hostdata =
1289 (struct ibmvscsi_host_data *)shost->hostdata;
1290 int len;
1291
1292 len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
1293 return len;
1294}
1295
1296static struct class_device_attribute ibmvscsi_host_os_type = {
1297 .attr = {
1298 .name = "os_type",
1299 .mode = S_IRUGO,
1300 },
1301 .show = show_host_os_type,
1302};
1303
1304static ssize_t show_host_config(struct class_device *class_dev, char *buf)
1305{
1306 struct Scsi_Host *shost = class_to_shost(class_dev);
1307 struct ibmvscsi_host_data *hostdata =
1308 (struct ibmvscsi_host_data *)shost->hostdata;
1309
1310 /* returns null-terminated host config data */
1311 if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
1312 return strlen(buf);
1313 else
1314 return 0;
1315}
1316
1317static struct class_device_attribute ibmvscsi_host_config = {
1318 .attr = {
1319 .name = "config",
1320 .mode = S_IRUGO,
1321 },
1322 .show = show_host_config,
1323};
1324
1325static struct class_device_attribute *ibmvscsi_attrs[] = {
1326 &ibmvscsi_host_srp_version,
1327 &ibmvscsi_host_partition_name,
1328 &ibmvscsi_host_partition_number,
1329 &ibmvscsi_host_mad_version,
1330 &ibmvscsi_host_os_type,
1331 &ibmvscsi_host_config,
1332 NULL
1333};
1334
1335/* ------------------------------------------------------------
1336 * SCSI driver registration
1337 */
1338static struct scsi_host_template driver_template = {
1339 .module = THIS_MODULE,
1340 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
1341 .proc_name = "ibmvscsi",
1342 .queuecommand = ibmvscsi_queuecommand,
1343 .eh_abort_handler = ibmvscsi_eh_abort_handler,
1344 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
1345 .cmd_per_lun = 16,
1346 .can_queue = 1, /* Updated after SRP_LOGIN */
1347 .this_id = -1,
1348 .sg_tablesize = MAX_INDIRECT_BUFS,
1349 .use_clustering = ENABLE_CLUSTERING,
1350 .shost_attrs = ibmvscsi_attrs,
1351};
1352
1353/**
1354 * Called by bus code for each adapter
1355 */
1356static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1357{
1358 struct ibmvscsi_host_data *hostdata;
1359 struct Scsi_Host *host;
1360 struct device *dev = &vdev->dev;
1361 unsigned long wait_switch = 0;
1362
1363 vdev->dev.driver_data = NULL;
1364
1365 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
1366 if (!host) {
1367 printk(KERN_ERR "ibmvscsi: couldn't allocate host data\n");
1368 goto scsi_host_alloc_failed;
1369 }
1370
1371 hostdata = (struct ibmvscsi_host_data *)host->hostdata;
1372 memset(hostdata, 0x00, sizeof(*hostdata));
1373 INIT_LIST_HEAD(&hostdata->sent);
1374 hostdata->host = host;
1375 hostdata->dev = dev;
1376 atomic_set(&hostdata->request_limit, -1);
1377 hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
1378
1379 if (ibmvscsi_init_crq_queue(&hostdata->queue, hostdata,
1380 max_requests) != 0) {
1381 printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n");
1382 goto init_crq_failed;
1383 }
1384 if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) {
1385 printk(KERN_ERR "ibmvscsi: couldn't initialize event pool\n");
1386 goto init_pool_failed;
1387 }
1388
1389 host->max_lun = 8;
1390 host->max_id = max_id;
1391 host->max_channel = max_channel;
1392
1393 if (scsi_add_host(hostdata->host, hostdata->dev))
1394 goto add_host_failed;
1395
1396 /* Try to send an initialization message. Note that this is allowed
1397 * to fail if the other end is not acive. In that case we don't
1398 * want to scan
1399 */
1400 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0) {
1401 /*
1402 * Wait around max init_timeout secs for the adapter to finish
1403 * initializing. When we are done initializing, we will have a
1404 * valid request_limit. We don't want Linux scanning before
1405 * we are ready.
1406 */
1407 for (wait_switch = jiffies + (init_timeout * HZ);
1408 time_before(jiffies, wait_switch) &&
1409 atomic_read(&hostdata->request_limit) < 2;) {
1410
1411 msleep(10);
1412 }
1413
1414 /* if we now have a valid request_limit, initiate a scan */
1415 if (atomic_read(&hostdata->request_limit) > 0)
1416 scsi_scan_host(host);
1417 }
1418
1419 vdev->dev.driver_data = hostdata;
1420 return 0;
1421
1422 add_host_failed:
1423 release_event_pool(&hostdata->pool, hostdata);
1424 init_pool_failed:
1425 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests);
1426 init_crq_failed:
1427 scsi_host_put(host);
1428 scsi_host_alloc_failed:
1429 return -1;
1430}
1431
1432static int ibmvscsi_remove(struct vio_dev *vdev)
1433{
1434 struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data;
1435 release_event_pool(&hostdata->pool, hostdata);
1436 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
1437 max_requests);
1438
1439 scsi_remove_host(hostdata->host);
1440 scsi_host_put(hostdata->host);
1441
1442 return 0;
1443}
1444
1445/**
1446 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1447 * support.
1448 */
1449static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
1450 {"vscsi", "IBM,v-scsi"},
1451 {0,}
1452};
1453
1454MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
1455static struct vio_driver ibmvscsi_driver = {
1456 .name = "ibmvscsi",
1457 .id_table = ibmvscsi_device_table,
1458 .probe = ibmvscsi_probe,
1459 .remove = ibmvscsi_remove
1460};
1461
1462int __init ibmvscsi_module_init(void)
1463{
1464 return vio_register_driver(&ibmvscsi_driver);
1465}
1466
1467void __exit ibmvscsi_module_exit(void)
1468{
1469 vio_unregister_driver(&ibmvscsi_driver);
1470}
1471
1472module_init(ibmvscsi_module_init);
1473module_exit(ibmvscsi_module_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-12 07:21:36 -0500