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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* ------------------------------------------------------------
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;
Robert Jenningsa897ff22007-03-28 12:45:46 -050088static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Dave C Boutcher2b541f82006-01-19 13:34:44 -060090#define IBMVSCSI_VERSION "1.5.8"
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
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;
FUJITA Tomonori4c021dd132006-04-07 19:10:03 +0900124 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 if (!pool->events)
126 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128 pool->iu_storage =
129 dma_alloc_coherent(hostdata->dev,
130 pool->size * sizeof(*pool->iu_storage),
131 &pool->iu_token, 0);
132 if (!pool->iu_storage) {
133 kfree(pool->events);
134 return -ENOMEM;
135 }
136
137 for (i = 0; i < pool->size; ++i) {
138 struct srp_event_struct *evt = &pool->events[i];
139 memset(&evt->crq, 0x00, sizeof(evt->crq));
140 atomic_set(&evt->free, 1);
141 evt->crq.valid = 0x80;
142 evt->crq.IU_length = sizeof(*evt->xfer_iu);
143 evt->crq.IU_data_ptr = pool->iu_token +
144 sizeof(*evt->xfer_iu) * i;
145 evt->xfer_iu = pool->iu_storage + i;
146 evt->hostdata = hostdata;
James Bottomley4dddbc22005-09-06 17:11:54 -0500147 evt->ext_list = NULL;
148 evt->ext_list_token = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
150
151 return 0;
152}
153
154/**
155 * release_event_pool: - Frees memory of an event pool of a host
156 * @pool: event_pool to be released
157 * @hostdata: ibmvscsi_host_data who owns the even pool
158 *
159 * Returns zero on success.
160*/
161static void release_event_pool(struct event_pool *pool,
162 struct ibmvscsi_host_data *hostdata)
163{
164 int i, in_use = 0;
James Bottomley4dddbc22005-09-06 17:11:54 -0500165 for (i = 0; i < pool->size; ++i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 if (atomic_read(&pool->events[i].free) != 1)
167 ++in_use;
James Bottomley4dddbc22005-09-06 17:11:54 -0500168 if (pool->events[i].ext_list) {
169 dma_free_coherent(hostdata->dev,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900170 SG_ALL * sizeof(struct srp_direct_buf),
James Bottomley4dddbc22005-09-06 17:11:54 -0500171 pool->events[i].ext_list,
172 pool->events[i].ext_list_token);
173 }
174 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (in_use)
Brian King6c0a60e2007-06-13 17:12:19 -0500176 dev_warn(hostdata->dev, "releasing event pool with %d "
177 "events still in use?\n", in_use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 kfree(pool->events);
179 dma_free_coherent(hostdata->dev,
180 pool->size * sizeof(*pool->iu_storage),
181 pool->iu_storage, pool->iu_token);
182}
183
184/**
185 * valid_event_struct: - Determines if event is valid.
186 * @pool: event_pool that contains the event
187 * @evt: srp_event_struct to be checked for validity
188 *
189 * Returns zero if event is invalid, one otherwise.
190*/
191static int valid_event_struct(struct event_pool *pool,
192 struct srp_event_struct *evt)
193{
194 int index = evt - pool->events;
195 if (index < 0 || index >= pool->size) /* outside of bounds */
196 return 0;
197 if (evt != pool->events + index) /* unaligned */
198 return 0;
199 return 1;
200}
201
202/**
203 * ibmvscsi_free-event_struct: - Changes status of event to "free"
204 * @pool: event_pool that contains the event
205 * @evt: srp_event_struct to be modified
206 *
207*/
208static void free_event_struct(struct event_pool *pool,
209 struct srp_event_struct *evt)
210{
211 if (!valid_event_struct(pool, evt)) {
Brian King6c0a60e2007-06-13 17:12:19 -0500212 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
213 "(not in pool %p)\n", evt, pool->events);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 return;
215 }
216 if (atomic_inc_return(&evt->free) != 1) {
Brian King6c0a60e2007-06-13 17:12:19 -0500217 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
218 "which is not in use!\n", evt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 return;
220 }
221}
222
223/**
224 * get_evt_struct: - Gets the next free event in pool
225 * @pool: event_pool that contains the events to be searched
226 *
227 * Returns the next event in "free" state, and NULL if none are free.
228 * Note that no synchronization is done here, we assume the host_lock
229 * will syncrhonze things.
230*/
231static struct srp_event_struct *get_event_struct(struct event_pool *pool)
232{
233 int i;
234 int poolsize = pool->size;
235 int offset = pool->next;
236
237 for (i = 0; i < poolsize; i++) {
238 offset = (offset + 1) % poolsize;
239 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
240 pool->next = offset;
241 return &pool->events[offset];
242 }
243 }
244
245 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
246 return NULL;
247}
248
249/**
250 * init_event_struct: Initialize fields in an event struct that are always
251 * required.
252 * @evt: The event
253 * @done: Routine to call when the event is responded to
254 * @format: SRP or MAD format
255 * @timeout: timeout value set in the CRQ
256 */
257static void init_event_struct(struct srp_event_struct *evt_struct,
258 void (*done) (struct srp_event_struct *),
259 u8 format,
260 int timeout)
261{
262 evt_struct->cmnd = NULL;
263 evt_struct->cmnd_done = NULL;
264 evt_struct->sync_srp = NULL;
265 evt_struct->crq.format = format;
266 evt_struct->crq.timeout = timeout;
267 evt_struct->done = done;
268}
269
270/* ------------------------------------------------------------
271 * Routines for receiving SCSI responses from the hosting partition
272 */
273
274/**
275 * set_srp_direction: Set the fields in the srp related to data
276 * direction and number of buffers based on the direction in
277 * the scsi_cmnd and the number of buffers
278 */
279static void set_srp_direction(struct scsi_cmnd *cmd,
280 struct srp_cmd *srp_cmd,
281 int numbuf)
282{
FUJITA Tomonorief265672006-03-26 03:57:14 +0900283 u8 fmt;
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 if (numbuf == 0)
286 return;
287
FUJITA Tomonorief265672006-03-26 03:57:14 +0900288 if (numbuf == 1)
289 fmt = SRP_DATA_DESC_DIRECT;
290 else {
291 fmt = SRP_DATA_DESC_INDIRECT;
292 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (cmd->sc_data_direction == DMA_TO_DEVICE)
FUJITA Tomonorief265672006-03-26 03:57:14 +0900295 srp_cmd->data_out_desc_cnt = numbuf;
296 else
297 srp_cmd->data_in_desc_cnt = numbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 }
FUJITA Tomonorief265672006-03-26 03:57:14 +0900299
300 if (cmd->sc_data_direction == DMA_TO_DEVICE)
301 srp_cmd->buf_fmt = fmt << 4;
302 else
303 srp_cmd->buf_fmt = fmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304}
305
FUJITA Tomonorief265672006-03-26 03:57:14 +0900306static void unmap_sg_list(int num_entries,
James Bottomley4dddbc22005-09-06 17:11:54 -0500307 struct device *dev,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900308 struct srp_direct_buf *md)
309{
James Bottomley4dddbc22005-09-06 17:11:54 -0500310 int i;
311
FUJITA Tomonorief265672006-03-26 03:57:14 +0900312 for (i = 0; i < num_entries; ++i)
313 dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL);
James Bottomley4dddbc22005-09-06 17:11:54 -0500314}
315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316/**
317 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
318 * @cmd: srp_cmd whose additional_data member will be unmapped
319 * @dev: device for which the memory is mapped
320 *
321*/
James Bottomley4dddbc22005-09-06 17:11:54 -0500322static void unmap_cmd_data(struct srp_cmd *cmd,
323 struct srp_event_struct *evt_struct,
324 struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325{
FUJITA Tomonorief265672006-03-26 03:57:14 +0900326 u8 out_fmt, in_fmt;
327
328 out_fmt = cmd->buf_fmt >> 4;
329 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
330
331 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900333 else if (out_fmt == SRP_DATA_DESC_DIRECT ||
334 in_fmt == SRP_DATA_DESC_DIRECT) {
335 struct srp_direct_buf *data =
336 (struct srp_direct_buf *) cmd->add_data;
337 dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 } else {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900339 struct srp_indirect_buf *indirect =
340 (struct srp_indirect_buf *) cmd->add_data;
341 int num_mapped = indirect->table_desc.len /
342 sizeof(struct srp_direct_buf);
James Bottomley4dddbc22005-09-06 17:11:54 -0500343
344 if (num_mapped <= MAX_INDIRECT_BUFS) {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900345 unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]);
James Bottomley4dddbc22005-09-06 17:11:54 -0500346 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 }
James Bottomley4dddbc22005-09-06 17:11:54 -0500348
349 unmap_sg_list(num_mapped, dev, evt_struct->ext_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 }
351}
352
James Bottomley4dddbc22005-09-06 17:11:54 -0500353static int map_sg_list(int num_entries,
354 struct scatterlist *sg,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900355 struct srp_direct_buf *md)
James Bottomley4dddbc22005-09-06 17:11:54 -0500356{
357 int i;
358 u64 total_length = 0;
359
360 for (i = 0; i < num_entries; ++i) {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900361 struct srp_direct_buf *descr = md + i;
James Bottomley4dddbc22005-09-06 17:11:54 -0500362 struct scatterlist *sg_entry = &sg[i];
FUJITA Tomonorief265672006-03-26 03:57:14 +0900363 descr->va = sg_dma_address(sg_entry);
364 descr->len = sg_dma_len(sg_entry);
365 descr->key = 0;
James Bottomley4dddbc22005-09-06 17:11:54 -0500366 total_length += sg_dma_len(sg_entry);
367 }
368 return total_length;
369}
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371/**
372 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
373 * @cmd: Scsi_Cmnd with the scatterlist
374 * @srp_cmd: srp_cmd that contains the memory descriptor
375 * @dev: device for which to map dma memory
376 *
377 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
378 * Returns 1 on success.
379*/
380static int map_sg_data(struct scsi_cmnd *cmd,
James Bottomley4dddbc22005-09-06 17:11:54 -0500381 struct srp_event_struct *evt_struct,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 struct srp_cmd *srp_cmd, struct device *dev)
383{
384
James Bottomley4dddbc22005-09-06 17:11:54 -0500385 int sg_mapped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 u64 total_length = 0;
387 struct scatterlist *sg = cmd->request_buffer;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900388 struct srp_direct_buf *data =
389 (struct srp_direct_buf *) srp_cmd->add_data;
390 struct srp_indirect_buf *indirect =
391 (struct srp_indirect_buf *) data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393 sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL);
394
395 if (sg_mapped == 0)
396 return 0;
397
398 set_srp_direction(cmd, srp_cmd, sg_mapped);
399
400 /* special case; we can use a single direct descriptor */
401 if (sg_mapped == 1) {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900402 data->va = sg_dma_address(&sg[0]);
403 data->len = sg_dma_len(&sg[0]);
404 data->key = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 return 1;
406 }
407
FUJITA Tomonorief265672006-03-26 03:57:14 +0900408 indirect->table_desc.va = 0;
409 indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf);
410 indirect->table_desc.key = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
James Bottomley4dddbc22005-09-06 17:11:54 -0500412 if (sg_mapped <= MAX_INDIRECT_BUFS) {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900413 total_length = map_sg_list(sg_mapped, sg,
414 &indirect->desc_list[0]);
415 indirect->len = total_length;
James Bottomley4dddbc22005-09-06 17:11:54 -0500416 return 1;
417 }
418
419 /* get indirect table */
420 if (!evt_struct->ext_list) {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900421 evt_struct->ext_list = (struct srp_direct_buf *)
James Bottomley4dddbc22005-09-06 17:11:54 -0500422 dma_alloc_coherent(dev,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900423 SG_ALL * sizeof(struct srp_direct_buf),
424 &evt_struct->ext_list_token, 0);
James Bottomley4dddbc22005-09-06 17:11:54 -0500425 if (!evt_struct->ext_list) {
Brian King6c0a60e2007-06-13 17:12:19 -0500426 sdev_printk(KERN_ERR, cmd->device,
427 "Can't allocate memory for indirect table\n");
James Bottomley4dddbc22005-09-06 17:11:54 -0500428 return 0;
James Bottomley4dddbc22005-09-06 17:11:54 -0500429 }
430 }
431
432 total_length = map_sg_list(sg_mapped, sg, evt_struct->ext_list);
433
FUJITA Tomonorief265672006-03-26 03:57:14 +0900434 indirect->len = total_length;
435 indirect->table_desc.va = evt_struct->ext_list_token;
436 indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
437 memcpy(indirect->desc_list, evt_struct->ext_list,
438 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
James Bottomley4dddbc22005-09-06 17:11:54 -0500439
440 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441}
442
443/**
444 * map_single_data: - Maps memory and initializes memory decriptor fields
445 * @cmd: struct scsi_cmnd with the memory to be mapped
446 * @srp_cmd: srp_cmd that contains the memory descriptor
447 * @dev: device for which to map dma memory
448 *
449 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
450 * Returns 1 on success.
451*/
452static int map_single_data(struct scsi_cmnd *cmd,
453 struct srp_cmd *srp_cmd, struct device *dev)
454{
FUJITA Tomonorief265672006-03-26 03:57:14 +0900455 struct srp_direct_buf *data =
456 (struct srp_direct_buf *) srp_cmd->add_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
FUJITA Tomonorief265672006-03-26 03:57:14 +0900458 data->va =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 dma_map_single(dev, cmd->request_buffer,
460 cmd->request_bufflen,
461 DMA_BIDIRECTIONAL);
FUJITA Tomonorief265672006-03-26 03:57:14 +0900462 if (dma_mapping_error(data->va)) {
Brian King6c0a60e2007-06-13 17:12:19 -0500463 sdev_printk(KERN_ERR, cmd->device,
464 "Unable to map request_buffer for command!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 return 0;
466 }
FUJITA Tomonorief265672006-03-26 03:57:14 +0900467 data->len = cmd->request_bufflen;
468 data->key = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470 set_srp_direction(cmd, srp_cmd, 1);
471
472 return 1;
473}
474
475/**
476 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
477 * @cmd: struct scsi_cmnd with the memory to be mapped
478 * @srp_cmd: srp_cmd that contains the memory descriptor
479 * @dev: dma device for which to map dma memory
480 *
481 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
482 * Returns 1 on success.
483*/
484static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
James Bottomley4dddbc22005-09-06 17:11:54 -0500485 struct srp_event_struct *evt_struct,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 struct srp_cmd *srp_cmd, struct device *dev)
487{
488 switch (cmd->sc_data_direction) {
489 case DMA_FROM_DEVICE:
490 case DMA_TO_DEVICE:
491 break;
492 case DMA_NONE:
493 return 1;
494 case DMA_BIDIRECTIONAL:
Brian King6c0a60e2007-06-13 17:12:19 -0500495 sdev_printk(KERN_ERR, cmd->device,
496 "Can't map DMA_BIDIRECTIONAL to read/write\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 return 0;
498 default:
Brian King6c0a60e2007-06-13 17:12:19 -0500499 sdev_printk(KERN_ERR, cmd->device,
500 "Unknown data direction 0x%02x; can't map!\n",
501 cmd->sc_data_direction);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 return 0;
503 }
504
505 if (!cmd->request_buffer)
506 return 1;
507 if (cmd->use_sg)
James Bottomley4dddbc22005-09-06 17:11:54 -0500508 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 return map_single_data(cmd, srp_cmd, dev);
510}
511
Brian King3d0e91f2007-06-13 17:12:26 -0500512/**
513 * purge_requests: Our virtual adapter just shut down. purge any sent requests
514 * @hostdata: the adapter
515 */
516static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
517{
518 struct srp_event_struct *tmp_evt, *pos;
519 unsigned long flags;
520
521 spin_lock_irqsave(hostdata->host->host_lock, flags);
522 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
523 list_del(&tmp_evt->list);
524 del_timer(&tmp_evt->timer);
525 if (tmp_evt->cmnd) {
526 tmp_evt->cmnd->result = (error_code << 16);
527 unmap_cmd_data(&tmp_evt->iu.srp.cmd,
528 tmp_evt,
529 tmp_evt->hostdata->dev);
530 if (tmp_evt->cmnd_done)
531 tmp_evt->cmnd_done(tmp_evt->cmnd);
532 } else if (tmp_evt->done)
533 tmp_evt->done(tmp_evt);
534 free_event_struct(&tmp_evt->hostdata->pool, tmp_evt);
535 }
536 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
537}
538
539/**
540 * ibmvscsi_reset_host - Reset the connection to the server
541 * @hostdata: struct ibmvscsi_host_data to reset
542*/
543static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
544{
545 scsi_block_requests(hostdata->host);
546 atomic_set(&hostdata->request_limit, 0);
547
548 purge_requests(hostdata, DID_ERROR);
549 if ((ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata)) ||
550 (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0)) ||
551 (vio_enable_interrupts(to_vio_dev(hostdata->dev)))) {
552 atomic_set(&hostdata->request_limit, -1);
553 dev_err(hostdata->dev, "error after reset\n");
554 }
555
556 scsi_unblock_requests(hostdata->host);
557}
558
559/**
560 * ibmvscsi_timeout - Internal command timeout handler
561 * @evt_struct: struct srp_event_struct that timed out
562 *
563 * Called when an internally generated command times out
564*/
565static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
566{
567 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
568
569 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
570 evt_struct->iu.srp.cmd.opcode);
571
572 ibmvscsi_reset_host(hostdata);
573}
574
575
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576/* ------------------------------------------------------------
577 * Routines for sending and receiving SRPs
578 */
579/**
580 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
581 * @evt_struct: evt_struct to be sent
582 * @hostdata: ibmvscsi_host_data of host
Brian King3d0e91f2007-06-13 17:12:26 -0500583 * @timeout: timeout in seconds - 0 means do not time command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 *
585 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
586 * Note that this routine assumes that host_lock is held for synchronization
587*/
588static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
Brian King3d0e91f2007-06-13 17:12:26 -0500589 struct ibmvscsi_host_data *hostdata,
590 unsigned long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
Dave C Boutchercefbda22006-06-12 21:22:51 -0500593 int request_status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 int rc;
595
Robert Jenningsa897ff22007-03-28 12:45:46 -0500596 /* If we have exhausted our request limit, just fail this request,
597 * unless it is for a reset or abort.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 * Note that there are rare cases involving driver generated requests
599 * (such as task management requests) that the mid layer may think we
600 * can handle more requests (can_queue) when we actually can't
601 */
Dave C Boutchercefbda22006-06-12 21:22:51 -0500602 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
603 request_status =
604 atomic_dec_if_positive(&hostdata->request_limit);
605 /* If request limit was -1 when we started, it is now even
606 * less than that
607 */
608 if (request_status < -1)
609 goto send_error;
Robert Jenningsa897ff22007-03-28 12:45:46 -0500610 /* Otherwise, we may have run out of requests. */
611 /* Abort and reset calls should make it through.
612 * Nothing except abort and reset should use the last two
613 * slots unless we had two or less to begin with.
614 */
615 else if (request_status < 2 &&
616 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
617 /* In the case that we have less than two requests
618 * available, check the server limit as a combination
619 * of the request limit and the number of requests
620 * in-flight (the size of the send list). If the
621 * server limit is greater than 2, return busy so
622 * that the last two are reserved for reset and abort.
623 */
624 int server_limit = request_status;
625 struct srp_event_struct *tmp_evt;
626
627 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
628 server_limit++;
629 }
630
631 if (server_limit > 2)
632 goto send_busy;
633 }
Dave C Boutchercefbda22006-06-12 21:22:51 -0500634 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
636 /* Copy the IU into the transfer area */
637 *evt_struct->xfer_iu = evt_struct->iu;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900638 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640 /* Add this to the sent list. We need to do this
641 * before we actually send
642 * in case it comes back REALLY fast
643 */
644 list_add_tail(&evt_struct->list, &hostdata->sent);
645
Brian King3d0e91f2007-06-13 17:12:26 -0500646 init_timer(&evt_struct->timer);
647 if (timeout) {
648 evt_struct->timer.data = (unsigned long) evt_struct;
649 evt_struct->timer.expires = jiffies + (timeout * HZ);
650 evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
651 add_timer(&evt_struct->timer);
652 }
653
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 if ((rc =
655 ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
656 list_del(&evt_struct->list);
Brian King3d0e91f2007-06-13 17:12:26 -0500657 del_timer(&evt_struct->timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Brian King6c0a60e2007-06-13 17:12:19 -0500659 dev_err(hostdata->dev, "send error %d\n", rc);
Robert Jenningsa897ff22007-03-28 12:45:46 -0500660 atomic_inc(&hostdata->request_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 goto send_error;
662 }
663
664 return 0;
665
Dave C Boutchercefbda22006-06-12 21:22:51 -0500666 send_busy:
James Bottomley4dddbc22005-09-06 17:11:54 -0500667 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 free_event_struct(&hostdata->pool, evt_struct);
Robert Jenningsa897ff22007-03-28 12:45:46 -0500670 atomic_inc(&hostdata->request_limit);
671 return SCSI_MLQUEUE_HOST_BUSY;
Dave C Boutchercefbda22006-06-12 21:22:51 -0500672
673 send_error:
674 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
675
676 if (evt_struct->cmnd != NULL) {
677 evt_struct->cmnd->result = DID_ERROR << 16;
678 evt_struct->cmnd_done(evt_struct->cmnd);
679 } else if (evt_struct->done)
680 evt_struct->done(evt_struct);
681
682 free_event_struct(&hostdata->pool, evt_struct);
683 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684}
685
686/**
687 * handle_cmd_rsp: - Handle responses from commands
688 * @evt_struct: srp_event_struct to be handled
689 *
690 * Used as a callback by when sending scsi cmds.
691 * Gets called by ibmvscsi_handle_crq()
692*/
693static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
694{
695 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
696 struct scsi_cmnd *cmnd = evt_struct->cmnd;
697
FUJITA Tomonorief265672006-03-26 03:57:14 +0900698 if (unlikely(rsp->opcode != SRP_RSP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -0500700 dev_warn(evt_struct->hostdata->dev,
701 "bad SRP RSP type %d\n", rsp->opcode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 }
703
704 if (cmnd) {
705 cmnd->result = rsp->status;
706 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
707 memcpy(cmnd->sense_buffer,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900708 rsp->data,
709 rsp->sense_data_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 unmap_cmd_data(&evt_struct->iu.srp.cmd,
James Bottomley4dddbc22005-09-06 17:11:54 -0500711 evt_struct,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 evt_struct->hostdata->dev);
713
FUJITA Tomonorief265672006-03-26 03:57:14 +0900714 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
715 cmnd->resid = rsp->data_out_res_cnt;
716 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
717 cmnd->resid = rsp->data_in_res_cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 }
719
720 if (evt_struct->cmnd_done)
721 evt_struct->cmnd_done(cmnd);
722}
723
724/**
725 * lun_from_dev: - Returns the lun of the scsi device
726 * @dev: struct scsi_device
727 *
728*/
729static inline u16 lun_from_dev(struct scsi_device *dev)
730{
731 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
732}
733
734/**
735 * ibmvscsi_queue: - The queuecommand function of the scsi template
736 * @cmd: struct scsi_cmnd to be executed
737 * @done: Callback function to be called when cmd is completed
738*/
739static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
740 void (*done) (struct scsi_cmnd *))
741{
742 struct srp_cmd *srp_cmd;
743 struct srp_event_struct *evt_struct;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900744 struct srp_indirect_buf *indirect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 struct ibmvscsi_host_data *hostdata =
746 (struct ibmvscsi_host_data *)&cmnd->device->host->hostdata;
747 u16 lun = lun_from_dev(cmnd->device);
FUJITA Tomonorief265672006-03-26 03:57:14 +0900748 u8 out_fmt, in_fmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
750 evt_struct = get_event_struct(&hostdata->pool);
751 if (!evt_struct)
752 return SCSI_MLQUEUE_HOST_BUSY;
753
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 /* Set up the actual SRP IU */
755 srp_cmd = &evt_struct->iu.srp.cmd;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900756 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
757 srp_cmd->opcode = SRP_CMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd));
759 srp_cmd->lun = ((u64) lun) << 48;
760
James Bottomley4dddbc22005-09-06 17:11:54 -0500761 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
Brian King6c0a60e2007-06-13 17:12:19 -0500762 sdev_printk(KERN_ERR, cmnd->device, "couldn't convert cmd to srp_cmd\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 free_event_struct(&hostdata->pool, evt_struct);
764 return SCSI_MLQUEUE_HOST_BUSY;
765 }
766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 init_event_struct(evt_struct,
768 handle_cmd_rsp,
769 VIOSRP_SRP_FORMAT,
Dave C Boutcher8224bfa2005-08-22 14:38:26 -0500770 cmnd->timeout_per_command/HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
772 evt_struct->cmnd = cmnd;
773 evt_struct->cmnd_done = done;
774
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 /* Fix up dma address of the buffer itself */
FUJITA Tomonorief265672006-03-26 03:57:14 +0900776 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
777 out_fmt = srp_cmd->buf_fmt >> 4;
778 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
779 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
780 out_fmt == SRP_DATA_DESC_INDIRECT) &&
781 indirect->table_desc.va == 0) {
782 indirect->table_desc.va = evt_struct->crq.IU_data_ptr +
783 offsetof(struct srp_cmd, add_data) +
784 offsetof(struct srp_indirect_buf, desc_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 }
786
Brian King3d0e91f2007-06-13 17:12:26 -0500787 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}
789
790/* ------------------------------------------------------------
791 * Routines for driver initialization
792 */
793/**
794 * adapter_info_rsp: - Handle response to MAD adapter info request
795 * @evt_struct: srp_event_struct with the response
796 *
797 * Used as a "done" callback by when sending adapter_info. Gets called
798 * by ibmvscsi_handle_crq()
799*/
800static void adapter_info_rsp(struct srp_event_struct *evt_struct)
801{
802 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
803 dma_unmap_single(hostdata->dev,
804 evt_struct->iu.mad.adapter_info.buffer,
805 evt_struct->iu.mad.adapter_info.common.length,
806 DMA_BIDIRECTIONAL);
807
808 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
Brian King6c0a60e2007-06-13 17:12:19 -0500809 dev_err(hostdata->dev, "error %d getting adapter info\n",
810 evt_struct->xfer_iu->mad.adapter_info.common.status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 } else {
Brian King6c0a60e2007-06-13 17:12:19 -0500812 dev_info(hostdata->dev, "host srp version: %s, "
813 "host partition %s (%d), OS %d, max io %u\n",
814 hostdata->madapter_info.srp_version,
815 hostdata->madapter_info.partition_name,
816 hostdata->madapter_info.partition_number,
817 hostdata->madapter_info.os_type,
818 hostdata->madapter_info.port_max_txu[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820 if (hostdata->madapter_info.port_max_txu[0])
821 hostdata->host->max_sectors =
822 hostdata->madapter_info.port_max_txu[0] >> 9;
Dave C Boutcher154fb612005-09-13 10:09:02 -0500823
824 if (hostdata->madapter_info.os_type == 3 &&
825 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
Brian King6c0a60e2007-06-13 17:12:19 -0500826 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
827 hostdata->madapter_info.srp_version);
828 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
829 MAX_INDIRECT_BUFS);
Dave C Boutcher154fb612005-09-13 10:09:02 -0500830 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
831 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 }
833}
834
835/**
836 * send_mad_adapter_info: - Sends the mad adapter info request
837 * and stores the result so it can be retrieved with
838 * sysfs. We COULD consider causing a failure if the
839 * returned SRP version doesn't match ours.
840 * @hostdata: ibmvscsi_host_data of host
841 *
842 * Returns zero if successful.
843*/
844static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
845{
846 struct viosrp_adapter_info *req;
847 struct srp_event_struct *evt_struct;
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +0900848 dma_addr_t addr;
849
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 evt_struct = get_event_struct(&hostdata->pool);
851 if (!evt_struct) {
Brian King6c0a60e2007-06-13 17:12:19 -0500852 dev_err(hostdata->dev,
853 "couldn't allocate an event for ADAPTER_INFO_REQ!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 return;
855 }
856
857 init_event_struct(evt_struct,
858 adapter_info_rsp,
859 VIOSRP_MAD_FORMAT,
860 init_timeout * HZ);
861
862 req = &evt_struct->iu.mad.adapter_info;
863 memset(req, 0x00, sizeof(*req));
864
865 req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
866 req->common.length = sizeof(hostdata->madapter_info);
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +0900867 req->buffer = addr = dma_map_single(hostdata->dev,
868 &hostdata->madapter_info,
869 sizeof(hostdata->madapter_info),
870 DMA_BIDIRECTIONAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
872 if (dma_mapping_error(req->buffer)) {
Brian King6c0a60e2007-06-13 17:12:19 -0500873 dev_err(hostdata->dev, "Unable to map request_buffer for adapter_info!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 free_event_struct(&hostdata->pool, evt_struct);
875 return;
876 }
877
Brian King3d0e91f2007-06-13 17:12:26 -0500878 if (ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2)) {
Brian King6c0a60e2007-06-13 17:12:19 -0500879 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +0900880 dma_unmap_single(hostdata->dev,
881 addr,
882 sizeof(hostdata->madapter_info),
883 DMA_BIDIRECTIONAL);
884 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885};
886
887/**
888 * login_rsp: - Handle response to SRP login request
889 * @evt_struct: srp_event_struct with the response
890 *
891 * Used as a "done" callback by when sending srp_login. Gets called
892 * by ibmvscsi_handle_crq()
893*/
894static void login_rsp(struct srp_event_struct *evt_struct)
895{
896 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900897 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
898 case SRP_LOGIN_RSP: /* it worked! */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 break;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900900 case SRP_LOGIN_REJ: /* refused! */
Brian King6c0a60e2007-06-13 17:12:19 -0500901 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
902 evt_struct->xfer_iu->srp.login_rej.reason);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 /* Login failed. */
904 atomic_set(&hostdata->request_limit, -1);
905 return;
906 default:
Brian King6c0a60e2007-06-13 17:12:19 -0500907 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
908 evt_struct->xfer_iu->srp.login_rsp.opcode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 /* Login failed. */
910 atomic_set(&hostdata->request_limit, -1);
911 return;
912 }
913
Brian King6c0a60e2007-06-13 17:12:19 -0500914 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
Robert Jenningsa897ff22007-03-28 12:45:46 -0500916 if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta < 0)
Brian King6c0a60e2007-06-13 17:12:19 -0500917 dev_err(hostdata->dev, "Invalid request_limit.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
Robert Jenningsa897ff22007-03-28 12:45:46 -0500919 /* Now we know what the real request-limit is.
920 * This value is set rather than added to request_limit because
921 * request_limit could have been set to -1 by this client.
922 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 atomic_set(&hostdata->request_limit,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900924 evt_struct->xfer_iu->srp.login_rsp.req_lim_delta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
Dave C Boutcher2b541f82006-01-19 13:34:44 -0600926 /* If we had any pending I/Os, kick them */
927 scsi_unblock_requests(hostdata->host);
928
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 send_mad_adapter_info(hostdata);
930 return;
931}
932
933/**
934 * send_srp_login: - Sends the srp login
935 * @hostdata: ibmvscsi_host_data of host
936 *
937 * Returns zero if successful.
938*/
939static int send_srp_login(struct ibmvscsi_host_data *hostdata)
940{
941 int rc;
942 unsigned long flags;
943 struct srp_login_req *login;
944 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
945 if (!evt_struct) {
Brian King6c0a60e2007-06-13 17:12:19 -0500946 dev_err(hostdata->dev, "couldn't allocate an event for login req!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 return FAILED;
948 }
949
950 init_event_struct(evt_struct,
951 login_rsp,
952 VIOSRP_SRP_FORMAT,
953 init_timeout * HZ);
954
955 login = &evt_struct->iu.srp.login_req;
Dave C Boutcher2b541f82006-01-19 13:34:44 -0600956 memset(login, 0x00, sizeof(struct srp_login_req));
FUJITA Tomonorief265672006-03-26 03:57:14 +0900957 login->opcode = SRP_LOGIN_REQ;
958 login->req_it_iu_len = sizeof(union srp_iu);
959 login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960
Dave C Boutcher9b833e42006-03-23 13:47:07 -0600961 spin_lock_irqsave(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 /* Start out with a request limit of 1, since this is negotiated in
963 * the login request we are just sending
964 */
965 atomic_set(&hostdata->request_limit, 1);
966
Brian King3d0e91f2007-06-13 17:12:26 -0500967 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Brian King6c0a60e2007-06-13 17:12:19 -0500969 dev_info(hostdata->dev, "sent SRP login\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 return rc;
971};
972
973/**
974 * sync_completion: Signal that a synchronous command has completed
975 * Note that after returning from this call, the evt_struct is freed.
976 * the caller waiting on this completion shouldn't touch the evt_struct
977 * again.
978 */
979static void sync_completion(struct srp_event_struct *evt_struct)
980{
981 /* copy the response back */
982 if (evt_struct->sync_srp)
983 *evt_struct->sync_srp = *evt_struct->xfer_iu;
984
985 complete(&evt_struct->comp);
986}
987
988/**
989 * ibmvscsi_abort: Abort a command...from scsi host template
990 * send this over to the server and wait synchronously for the response
991 */
992static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
993{
994 struct ibmvscsi_host_data *hostdata =
995 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
996 struct srp_tsk_mgmt *tsk_mgmt;
997 struct srp_event_struct *evt;
998 struct srp_event_struct *tmp_evt, *found_evt;
999 union viosrp_iu srp_rsp;
1000 int rsp_rc;
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001001 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 u16 lun = lun_from_dev(cmd->device);
1003
1004 /* First, find this command in our sent list so we can figure
1005 * out the correct tag
1006 */
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001007 spin_lock_irqsave(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 found_evt = NULL;
1009 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1010 if (tmp_evt->cmnd == cmd) {
1011 found_evt = tmp_evt;
1012 break;
1013 }
1014 }
1015
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001016 if (!found_evt) {
1017 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 return FAILED;
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001019 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
1021 evt = get_event_struct(&hostdata->pool);
1022 if (evt == NULL) {
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001023 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Brian King6c0a60e2007-06-13 17:12:19 -05001024 sdev_printk(KERN_ERR, cmd->device, "failed to allocate abort event\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 return FAILED;
1026 }
1027
1028 init_event_struct(evt,
1029 sync_completion,
1030 VIOSRP_SRP_FORMAT,
1031 init_timeout * HZ);
1032
1033 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1034
1035 /* Set up an abort SRP command */
1036 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
FUJITA Tomonorief265672006-03-26 03:57:14 +09001037 tsk_mgmt->opcode = SRP_TSK_MGMT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 tsk_mgmt->lun = ((u64) lun) << 48;
FUJITA Tomonorief265672006-03-26 03:57:14 +09001039 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1040 tsk_mgmt->task_tag = (u64) found_evt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
Brian King6c0a60e2007-06-13 17:12:19 -05001042 sdev_printk(KERN_INFO, cmd->device, "aborting command. lun 0x%lx, tag 0x%lx\n",
1043 tsk_mgmt->lun, tsk_mgmt->task_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
1045 evt->sync_srp = &srp_rsp;
1046 init_completion(&evt->comp);
Brian King3d0e91f2007-06-13 17:12:26 -05001047 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2);
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001048 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1049 if (rsp_rc != 0) {
Brian King6c0a60e2007-06-13 17:12:19 -05001050 sdev_printk(KERN_ERR, cmd->device,
1051 "failed to send abort() event. rc=%d\n", rsp_rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 return FAILED;
1053 }
1054
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 wait_for_completion(&evt->comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056
1057 /* make sure we got a good response */
FUJITA Tomonorief265672006-03-26 03:57:14 +09001058 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -05001060 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1061 srp_rsp.srp.rsp.opcode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 return FAILED;
1063 }
1064
FUJITA Tomonorief265672006-03-26 03:57:14 +09001065 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1066 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 else
1068 rsp_rc = srp_rsp.srp.rsp.status;
1069
1070 if (rsp_rc) {
1071 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -05001072 sdev_printk(KERN_WARNING, cmd->device,
1073 "abort code %d for task tag 0x%lx\n",
1074 rsp_rc, tsk_mgmt->task_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 return FAILED;
1076 }
1077
1078 /* Because we dropped the spinlock above, it's possible
1079 * The event is no longer in our list. Make sure it didn't
1080 * complete while we were aborting
1081 */
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001082 spin_lock_irqsave(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 found_evt = NULL;
1084 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1085 if (tmp_evt->cmnd == cmd) {
1086 found_evt = tmp_evt;
1087 break;
1088 }
1089 }
1090
1091 if (found_evt == NULL) {
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001092 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Brian King6c0a60e2007-06-13 17:12:19 -05001093 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%lx completed\n",
1094 tsk_mgmt->task_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 return SUCCESS;
1096 }
1097
Brian King6c0a60e2007-06-13 17:12:19 -05001098 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%lx\n",
1099 tsk_mgmt->task_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
1101 cmd->result = (DID_ABORT << 16);
1102 list_del(&found_evt->list);
James Bottomley4dddbc22005-09-06 17:11:54 -05001103 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1104 found_evt->hostdata->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 free_event_struct(&found_evt->hostdata->pool, found_evt);
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001106 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 atomic_inc(&hostdata->request_limit);
1108 return SUCCESS;
1109}
1110
1111/**
1112 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1113 * template send this over to the server and wait synchronously for the
1114 * response
1115 */
1116static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1117{
1118 struct ibmvscsi_host_data *hostdata =
1119 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
1120
1121 struct srp_tsk_mgmt *tsk_mgmt;
1122 struct srp_event_struct *evt;
1123 struct srp_event_struct *tmp_evt, *pos;
1124 union viosrp_iu srp_rsp;
1125 int rsp_rc;
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001126 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 u16 lun = lun_from_dev(cmd->device);
1128
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001129 spin_lock_irqsave(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 evt = get_event_struct(&hostdata->pool);
1131 if (evt == NULL) {
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001132 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Brian King6c0a60e2007-06-13 17:12:19 -05001133 sdev_printk(KERN_ERR, cmd->device, "failed to allocate reset event\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 return FAILED;
1135 }
1136
1137 init_event_struct(evt,
1138 sync_completion,
1139 VIOSRP_SRP_FORMAT,
1140 init_timeout * HZ);
1141
1142 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1143
1144 /* Set up a lun reset SRP command */
1145 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
FUJITA Tomonorief265672006-03-26 03:57:14 +09001146 tsk_mgmt->opcode = SRP_TSK_MGMT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 tsk_mgmt->lun = ((u64) lun) << 48;
FUJITA Tomonorief265672006-03-26 03:57:14 +09001148 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
Brian King6c0a60e2007-06-13 17:12:19 -05001150 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%lx\n",
1151 tsk_mgmt->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
1153 evt->sync_srp = &srp_rsp;
1154 init_completion(&evt->comp);
Brian King3d0e91f2007-06-13 17:12:26 -05001155 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2);
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001156 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1157 if (rsp_rc != 0) {
Brian King6c0a60e2007-06-13 17:12:19 -05001158 sdev_printk(KERN_ERR, cmd->device,
1159 "failed to send reset event. rc=%d\n", rsp_rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 return FAILED;
1161 }
1162
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 wait_for_completion(&evt->comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164
1165 /* make sure we got a good response */
FUJITA Tomonorief265672006-03-26 03:57:14 +09001166 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -05001168 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1169 srp_rsp.srp.rsp.opcode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 return FAILED;
1171 }
1172
FUJITA Tomonorief265672006-03-26 03:57:14 +09001173 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1174 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 else
1176 rsp_rc = srp_rsp.srp.rsp.status;
1177
1178 if (rsp_rc) {
1179 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -05001180 sdev_printk(KERN_WARNING, cmd->device,
1181 "reset code %d for task tag 0x%lx\n",
1182 rsp_rc, tsk_mgmt->task_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 return FAILED;
1184 }
1185
1186 /* We need to find all commands for this LUN that have not yet been
1187 * responded to, and fail them with DID_RESET
1188 */
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001189 spin_lock_irqsave(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1191 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1192 if (tmp_evt->cmnd)
1193 tmp_evt->cmnd->result = (DID_RESET << 16);
1194 list_del(&tmp_evt->list);
James Bottomley4dddbc22005-09-06 17:11:54 -05001195 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1196 tmp_evt->hostdata->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 free_event_struct(&tmp_evt->hostdata->pool,
1198 tmp_evt);
1199 atomic_inc(&hostdata->request_limit);
1200 if (tmp_evt->cmnd_done)
1201 tmp_evt->cmnd_done(tmp_evt->cmnd);
1202 else if (tmp_evt->done)
1203 tmp_evt->done(tmp_evt);
1204 }
1205 }
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001206 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 return SUCCESS;
1208}
1209
1210/**
Brian King3d0e91f2007-06-13 17:12:26 -05001211 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1212 * @cmd: struct scsi_cmnd having problems
1213*/
1214static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215{
Brian King3d0e91f2007-06-13 17:12:26 -05001216 unsigned long wait_switch = 0;
1217 struct ibmvscsi_host_data *hostdata =
1218 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
Brian King3d0e91f2007-06-13 17:12:26 -05001220 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1221
1222 ibmvscsi_reset_host(hostdata);
1223
1224 for (wait_switch = jiffies + (init_timeout * HZ);
1225 time_before(jiffies, wait_switch) &&
1226 atomic_read(&hostdata->request_limit) < 2;) {
1227
1228 msleep(10);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 }
Brian King3d0e91f2007-06-13 17:12:26 -05001230
1231 if (atomic_read(&hostdata->request_limit) <= 0)
1232 return FAILED;
1233
1234 return SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235}
1236
1237/**
1238 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1239 * @crq: Command/Response queue
1240 * @hostdata: ibmvscsi_host_data of host
1241 *
1242*/
1243void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1244 struct ibmvscsi_host_data *hostdata)
1245{
Brian King6c0a60e2007-06-13 17:12:19 -05001246 long rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 unsigned long flags;
1248 struct srp_event_struct *evt_struct =
1249 (struct srp_event_struct *)crq->IU_data_ptr;
1250 switch (crq->valid) {
1251 case 0xC0: /* initialization */
1252 switch (crq->format) {
1253 case 0x01: /* Initialization message */
Brian King6c0a60e2007-06-13 17:12:19 -05001254 dev_info(hostdata->dev, "partner initialized\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 /* Send back a response */
Brian King6c0a60e2007-06-13 17:12:19 -05001256 if ((rc = ibmvscsi_send_crq(hostdata,
1257 0xC002000000000000LL, 0)) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 /* Now login */
1259 send_srp_login(hostdata);
1260 } else {
Brian King6c0a60e2007-06-13 17:12:19 -05001261 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 }
1263
1264 break;
1265 case 0x02: /* Initialization response */
Brian King6c0a60e2007-06-13 17:12:19 -05001266 dev_info(hostdata->dev, "partner initialization complete\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267
1268 /* Now login */
1269 send_srp_login(hostdata);
1270 break;
1271 default:
Brian King6c0a60e2007-06-13 17:12:19 -05001272 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 }
1274 return;
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001275 case 0xFF: /* Hypervisor telling us the connection is closed */
1276 scsi_block_requests(hostdata->host);
Dave C Boutchercefbda22006-06-12 21:22:51 -05001277 atomic_set(&hostdata->request_limit, 0);
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001278 if (crq->format == 0x06) {
1279 /* We need to re-setup the interpartition connection */
Brian King6c0a60e2007-06-13 17:12:19 -05001280 dev_info(hostdata->dev, "Re-enabling adapter!\n");
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001281 purge_requests(hostdata, DID_REQUEUE);
Dave C Boutchercefbda22006-06-12 21:22:51 -05001282 if ((ibmvscsi_reenable_crq_queue(&hostdata->queue,
Santiago Leon9c3121f2006-10-13 10:22:50 -05001283 hostdata)) ||
Dave C Boutchercefbda22006-06-12 21:22:51 -05001284 (ibmvscsi_send_crq(hostdata,
1285 0xC001000000000000LL, 0))) {
1286 atomic_set(&hostdata->request_limit,
1287 -1);
Brian King6c0a60e2007-06-13 17:12:19 -05001288 dev_err(hostdata->dev, "error after enable\n");
Dave C Boutchercefbda22006-06-12 21:22:51 -05001289 }
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001290 } else {
Brian King6c0a60e2007-06-13 17:12:19 -05001291 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1292 crq->format);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001294 purge_requests(hostdata, DID_ERROR);
Dave C Boutchercefbda22006-06-12 21:22:51 -05001295 if ((ibmvscsi_reset_crq_queue(&hostdata->queue,
1296 hostdata)) ||
1297 (ibmvscsi_send_crq(hostdata,
1298 0xC001000000000000LL, 0))) {
1299 atomic_set(&hostdata->request_limit,
1300 -1);
Brian King6c0a60e2007-06-13 17:12:19 -05001301 dev_err(hostdata->dev, "error after reset\n");
Dave C Boutchercefbda22006-06-12 21:22:51 -05001302 }
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001303 }
1304 scsi_unblock_requests(hostdata->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 return;
1306 case 0x80: /* real payload */
1307 break;
1308 default:
Brian King6c0a60e2007-06-13 17:12:19 -05001309 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1310 crq->valid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 return;
1312 }
1313
1314 /* The only kind of payload CRQs we should get are responses to
1315 * things we send. Make sure this response is to something we
1316 * actually sent
1317 */
1318 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
Brian King6c0a60e2007-06-13 17:12:19 -05001319 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 (void *)crq->IU_data_ptr);
1321 return;
1322 }
1323
1324 if (atomic_read(&evt_struct->free)) {
Brian King6c0a60e2007-06-13 17:12:19 -05001325 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1326 (void *)crq->IU_data_ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 return;
1328 }
1329
1330 if (crq->format == VIOSRP_SRP_FORMAT)
FUJITA Tomonorief265672006-03-26 03:57:14 +09001331 atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 &hostdata->request_limit);
1333
Brian King3d0e91f2007-06-13 17:12:26 -05001334 del_timer(&evt_struct->timer);
1335
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 if (evt_struct->done)
1337 evt_struct->done(evt_struct);
1338 else
Brian King6c0a60e2007-06-13 17:12:19 -05001339 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340
1341 /*
1342 * Lock the host_lock before messing with these structures, since we
1343 * are running in a task context
1344 */
1345 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1346 list_del(&evt_struct->list);
1347 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1348 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1349}
1350
1351/**
1352 * ibmvscsi_get_host_config: Send the command to the server to get host
1353 * configuration data. The data is opaque to us.
1354 */
1355static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1356 unsigned char *buffer, int length)
1357{
1358 struct viosrp_host_config *host_config;
1359 struct srp_event_struct *evt_struct;
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +09001360 dma_addr_t addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 int rc;
1362
1363 evt_struct = get_event_struct(&hostdata->pool);
1364 if (!evt_struct) {
Brian King6c0a60e2007-06-13 17:12:19 -05001365 dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 return -1;
1367 }
1368
1369 init_event_struct(evt_struct,
1370 sync_completion,
1371 VIOSRP_MAD_FORMAT,
1372 init_timeout * HZ);
1373
1374 host_config = &evt_struct->iu.mad.host_config;
1375
1376 /* Set up a lun reset SRP command */
1377 memset(host_config, 0x00, sizeof(*host_config));
1378 host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1379 host_config->common.length = length;
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +09001380 host_config->buffer = addr = dma_map_single(hostdata->dev, buffer,
1381 length,
1382 DMA_BIDIRECTIONAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383
1384 if (dma_mapping_error(host_config->buffer)) {
Brian King6c0a60e2007-06-13 17:12:19 -05001385 dev_err(hostdata->dev, "dma_mapping error getting host config\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 free_event_struct(&hostdata->pool, evt_struct);
1387 return -1;
1388 }
1389
1390 init_completion(&evt_struct->comp);
Brian King3d0e91f2007-06-13 17:12:26 -05001391 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2);
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +09001392 if (rc == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 wait_for_completion(&evt_struct->comp);
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +09001394 dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395
1396 return rc;
1397}
1398
Robert Jennings0979c842007-03-29 12:30:40 -05001399/**
1400 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1401 * @sdev: struct scsi_device device to configure
1402 *
1403 * Enable allow_restart for a device if it is a disk. Adjust the
1404 * queue_depth here also as is required by the documentation for
1405 * struct scsi_host_template.
1406 */
1407static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1408{
1409 struct Scsi_Host *shost = sdev->host;
1410 unsigned long lock_flags = 0;
1411
1412 spin_lock_irqsave(shost->host_lock, lock_flags);
1413 if (sdev->type == TYPE_DISK)
1414 sdev->allow_restart = 1;
1415 scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun);
1416 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1417 return 0;
1418}
1419
Brian King742d25b2007-05-29 15:46:14 -05001420/**
1421 * ibmvscsi_change_queue_depth - Change the device's queue depth
1422 * @sdev: scsi device struct
1423 * @qdepth: depth to set
1424 *
1425 * Return value:
1426 * actual depth set
1427 **/
1428static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1429{
1430 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1431 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1432
1433 scsi_adjust_queue_depth(sdev, 0, qdepth);
1434 return sdev->queue_depth;
1435}
1436
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437/* ------------------------------------------------------------
1438 * sysfs attributes
1439 */
1440static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf)
1441{
1442 struct Scsi_Host *shost = class_to_shost(class_dev);
1443 struct ibmvscsi_host_data *hostdata =
1444 (struct ibmvscsi_host_data *)shost->hostdata;
1445 int len;
1446
1447 len = snprintf(buf, PAGE_SIZE, "%s\n",
1448 hostdata->madapter_info.srp_version);
1449 return len;
1450}
1451
1452static struct class_device_attribute ibmvscsi_host_srp_version = {
1453 .attr = {
1454 .name = "srp_version",
1455 .mode = S_IRUGO,
1456 },
1457 .show = show_host_srp_version,
1458};
1459
1460static ssize_t show_host_partition_name(struct class_device *class_dev,
1461 char *buf)
1462{
1463 struct Scsi_Host *shost = class_to_shost(class_dev);
1464 struct ibmvscsi_host_data *hostdata =
1465 (struct ibmvscsi_host_data *)shost->hostdata;
1466 int len;
1467
1468 len = snprintf(buf, PAGE_SIZE, "%s\n",
1469 hostdata->madapter_info.partition_name);
1470 return len;
1471}
1472
1473static struct class_device_attribute ibmvscsi_host_partition_name = {
1474 .attr = {
1475 .name = "partition_name",
1476 .mode = S_IRUGO,
1477 },
1478 .show = show_host_partition_name,
1479};
1480
1481static ssize_t show_host_partition_number(struct class_device *class_dev,
1482 char *buf)
1483{
1484 struct Scsi_Host *shost = class_to_shost(class_dev);
1485 struct ibmvscsi_host_data *hostdata =
1486 (struct ibmvscsi_host_data *)shost->hostdata;
1487 int len;
1488
1489 len = snprintf(buf, PAGE_SIZE, "%d\n",
1490 hostdata->madapter_info.partition_number);
1491 return len;
1492}
1493
1494static struct class_device_attribute ibmvscsi_host_partition_number = {
1495 .attr = {
1496 .name = "partition_number",
1497 .mode = S_IRUGO,
1498 },
1499 .show = show_host_partition_number,
1500};
1501
1502static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf)
1503{
1504 struct Scsi_Host *shost = class_to_shost(class_dev);
1505 struct ibmvscsi_host_data *hostdata =
1506 (struct ibmvscsi_host_data *)shost->hostdata;
1507 int len;
1508
1509 len = snprintf(buf, PAGE_SIZE, "%d\n",
1510 hostdata->madapter_info.mad_version);
1511 return len;
1512}
1513
1514static struct class_device_attribute ibmvscsi_host_mad_version = {
1515 .attr = {
1516 .name = "mad_version",
1517 .mode = S_IRUGO,
1518 },
1519 .show = show_host_mad_version,
1520};
1521
1522static ssize_t show_host_os_type(struct class_device *class_dev, char *buf)
1523{
1524 struct Scsi_Host *shost = class_to_shost(class_dev);
1525 struct ibmvscsi_host_data *hostdata =
1526 (struct ibmvscsi_host_data *)shost->hostdata;
1527 int len;
1528
1529 len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
1530 return len;
1531}
1532
1533static struct class_device_attribute ibmvscsi_host_os_type = {
1534 .attr = {
1535 .name = "os_type",
1536 .mode = S_IRUGO,
1537 },
1538 .show = show_host_os_type,
1539};
1540
1541static ssize_t show_host_config(struct class_device *class_dev, char *buf)
1542{
1543 struct Scsi_Host *shost = class_to_shost(class_dev);
1544 struct ibmvscsi_host_data *hostdata =
1545 (struct ibmvscsi_host_data *)shost->hostdata;
1546
1547 /* returns null-terminated host config data */
1548 if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
1549 return strlen(buf);
1550 else
1551 return 0;
1552}
1553
1554static struct class_device_attribute ibmvscsi_host_config = {
1555 .attr = {
1556 .name = "config",
1557 .mode = S_IRUGO,
1558 },
1559 .show = show_host_config,
1560};
1561
1562static struct class_device_attribute *ibmvscsi_attrs[] = {
1563 &ibmvscsi_host_srp_version,
1564 &ibmvscsi_host_partition_name,
1565 &ibmvscsi_host_partition_number,
1566 &ibmvscsi_host_mad_version,
1567 &ibmvscsi_host_os_type,
1568 &ibmvscsi_host_config,
1569 NULL
1570};
1571
1572/* ------------------------------------------------------------
1573 * SCSI driver registration
1574 */
1575static struct scsi_host_template driver_template = {
1576 .module = THIS_MODULE,
1577 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
1578 .proc_name = "ibmvscsi",
1579 .queuecommand = ibmvscsi_queuecommand,
1580 .eh_abort_handler = ibmvscsi_eh_abort_handler,
1581 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
Brian King3d0e91f2007-06-13 17:12:26 -05001582 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
Robert Jennings0979c842007-03-29 12:30:40 -05001583 .slave_configure = ibmvscsi_slave_configure,
Brian King742d25b2007-05-29 15:46:14 -05001584 .change_queue_depth = ibmvscsi_change_queue_depth,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 .cmd_per_lun = 16,
Robert Jenningsa897ff22007-03-28 12:45:46 -05001586 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 .this_id = -1,
James Bottomley4dddbc22005-09-06 17:11:54 -05001588 .sg_tablesize = SG_ALL,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 .use_clustering = ENABLE_CLUSTERING,
1590 .shost_attrs = ibmvscsi_attrs,
1591};
1592
1593/**
1594 * Called by bus code for each adapter
1595 */
1596static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1597{
1598 struct ibmvscsi_host_data *hostdata;
1599 struct Scsi_Host *host;
1600 struct device *dev = &vdev->dev;
1601 unsigned long wait_switch = 0;
Dave C Boutchercefbda22006-06-12 21:22:51 -05001602 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603
1604 vdev->dev.driver_data = NULL;
1605
Robert Jenningsa897ff22007-03-28 12:45:46 -05001606 driver_template.can_queue = max_requests;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
1608 if (!host) {
Brian King6c0a60e2007-06-13 17:12:19 -05001609 dev_err(&vdev->dev, "couldn't allocate host data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 goto scsi_host_alloc_failed;
1611 }
1612
1613 hostdata = (struct ibmvscsi_host_data *)host->hostdata;
1614 memset(hostdata, 0x00, sizeof(*hostdata));
1615 INIT_LIST_HEAD(&hostdata->sent);
1616 hostdata->host = host;
1617 hostdata->dev = dev;
1618 atomic_set(&hostdata->request_limit, -1);
1619 hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
1620
Dave C Boutchercefbda22006-06-12 21:22:51 -05001621 rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_requests);
1622 if (rc != 0 && rc != H_RESOURCE) {
Brian King6c0a60e2007-06-13 17:12:19 -05001623 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 goto init_crq_failed;
1625 }
1626 if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) {
Brian King6c0a60e2007-06-13 17:12:19 -05001627 dev_err(&vdev->dev, "couldn't initialize event pool\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 goto init_pool_failed;
1629 }
1630
1631 host->max_lun = 8;
1632 host->max_id = max_id;
1633 host->max_channel = max_channel;
1634
1635 if (scsi_add_host(hostdata->host, hostdata->dev))
1636 goto add_host_failed;
1637
1638 /* Try to send an initialization message. Note that this is allowed
1639 * to fail if the other end is not acive. In that case we don't
1640 * want to scan
1641 */
Dave C Boutchercefbda22006-06-12 21:22:51 -05001642 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
1643 || rc == H_RESOURCE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644 /*
1645 * Wait around max init_timeout secs for the adapter to finish
1646 * initializing. When we are done initializing, we will have a
1647 * valid request_limit. We don't want Linux scanning before
1648 * we are ready.
1649 */
1650 for (wait_switch = jiffies + (init_timeout * HZ);
1651 time_before(jiffies, wait_switch) &&
1652 atomic_read(&hostdata->request_limit) < 2;) {
1653
1654 msleep(10);
1655 }
1656
1657 /* if we now have a valid request_limit, initiate a scan */
1658 if (atomic_read(&hostdata->request_limit) > 0)
1659 scsi_scan_host(host);
1660 }
1661
1662 vdev->dev.driver_data = hostdata;
1663 return 0;
1664
1665 add_host_failed:
1666 release_event_pool(&hostdata->pool, hostdata);
1667 init_pool_failed:
1668 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests);
1669 init_crq_failed:
1670 scsi_host_put(host);
1671 scsi_host_alloc_failed:
1672 return -1;
1673}
1674
1675static int ibmvscsi_remove(struct vio_dev *vdev)
1676{
1677 struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data;
1678 release_event_pool(&hostdata->pool, hostdata);
1679 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
1680 max_requests);
1681
1682 scsi_remove_host(hostdata->host);
1683 scsi_host_put(hostdata->host);
1684
1685 return 0;
1686}
1687
1688/**
1689 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1690 * support.
1691 */
1692static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
1693 {"vscsi", "IBM,v-scsi"},
Stephen Rothwellfb120da2005-08-17 16:42:59 +10001694 { "", "" }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
Stephen Rothwell915124d2005-10-24 15:12:22 +10001697
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698static struct vio_driver ibmvscsi_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 .id_table = ibmvscsi_device_table,
1700 .probe = ibmvscsi_probe,
Stephen Rothwell6fdf5392005-10-24 14:53:21 +10001701 .remove = ibmvscsi_remove,
1702 .driver = {
1703 .name = "ibmvscsi",
Stephen Rothwell915124d2005-10-24 15:12:22 +10001704 .owner = THIS_MODULE,
Stephen Rothwell6fdf5392005-10-24 14:53:21 +10001705 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706};
1707
1708int __init ibmvscsi_module_init(void)
1709{
1710 return vio_register_driver(&ibmvscsi_driver);
1711}
1712
1713void __exit ibmvscsi_module_exit(void)
1714{
1715 vio_unregister_driver(&ibmvscsi_driver);
1716}
1717
1718module_init(ibmvscsi_module_init);
1719module_exit(ibmvscsi_module_exit);