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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>
David Woodhoused3849d52007-09-22 08:29:36 +100073#include <asm/firmware.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070074#include <asm/vio.h>
75#include <scsi/scsi.h>
76#include <scsi/scsi_cmnd.h>
77#include <scsi/scsi_host.h>
78#include <scsi/scsi_device.h>
FUJITA Tomonori4d680412007-06-27 16:32:50 +090079#include <scsi/scsi_transport_srp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070080#include "ibmvscsi.h"
81
82/* The values below are somewhat arbitrary default values, but
83 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
84 * Note that there are 3 bits of channel value, 6 bits of id, and
85 * 5 bits of LUN.
86 */
87static int max_id = 64;
88static int max_channel = 3;
89static int init_timeout = 5;
Robert Jenningsa897ff22007-03-28 12:45:46 -050090static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
FUJITA Tomonori4d680412007-06-27 16:32:50 +090092static struct scsi_transport_template *ibmvscsi_transport_template;
93
Dave C Boutcher2b541f82006-01-19 13:34:44 -060094#define IBMVSCSI_VERSION "1.5.8"
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
David Woodhoused3849d52007-09-22 08:29:36 +100096static struct ibmvscsi_ops *ibmvscsi_ops;
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098MODULE_DESCRIPTION("IBM Virtual SCSI");
99MODULE_AUTHOR("Dave Boutcher");
100MODULE_LICENSE("GPL");
101MODULE_VERSION(IBMVSCSI_VERSION);
102
103module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
104MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
105module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
106MODULE_PARM_DESC(max_channel, "Largest channel value");
107module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
108MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
109module_param_named(max_requests, max_requests, int, S_IRUGO | S_IWUSR);
110MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
111
112/* ------------------------------------------------------------
113 * Routines for the event pool and event structs
114 */
115/**
116 * initialize_event_pool: - Allocates and initializes the event pool for a host
117 * @pool: event_pool to be initialized
118 * @size: Number of events in pool
119 * @hostdata: ibmvscsi_host_data who owns the event pool
120 *
121 * Returns zero on success.
122*/
123static int initialize_event_pool(struct event_pool *pool,
124 int size, struct ibmvscsi_host_data *hostdata)
125{
126 int i;
127
128 pool->size = size;
129 pool->next = 0;
FUJITA Tomonori4c021dd132006-04-07 19:10:03 +0900130 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (!pool->events)
132 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134 pool->iu_storage =
135 dma_alloc_coherent(hostdata->dev,
136 pool->size * sizeof(*pool->iu_storage),
137 &pool->iu_token, 0);
138 if (!pool->iu_storage) {
139 kfree(pool->events);
140 return -ENOMEM;
141 }
142
143 for (i = 0; i < pool->size; ++i) {
144 struct srp_event_struct *evt = &pool->events[i];
145 memset(&evt->crq, 0x00, sizeof(evt->crq));
146 atomic_set(&evt->free, 1);
147 evt->crq.valid = 0x80;
148 evt->crq.IU_length = sizeof(*evt->xfer_iu);
149 evt->crq.IU_data_ptr = pool->iu_token +
150 sizeof(*evt->xfer_iu) * i;
151 evt->xfer_iu = pool->iu_storage + i;
152 evt->hostdata = hostdata;
James Bottomley4dddbc22005-09-06 17:11:54 -0500153 evt->ext_list = NULL;
154 evt->ext_list_token = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 }
156
157 return 0;
158}
159
160/**
161 * release_event_pool: - Frees memory of an event pool of a host
162 * @pool: event_pool to be released
163 * @hostdata: ibmvscsi_host_data who owns the even pool
164 *
165 * Returns zero on success.
166*/
167static void release_event_pool(struct event_pool *pool,
168 struct ibmvscsi_host_data *hostdata)
169{
170 int i, in_use = 0;
James Bottomley4dddbc22005-09-06 17:11:54 -0500171 for (i = 0; i < pool->size; ++i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (atomic_read(&pool->events[i].free) != 1)
173 ++in_use;
James Bottomley4dddbc22005-09-06 17:11:54 -0500174 if (pool->events[i].ext_list) {
175 dma_free_coherent(hostdata->dev,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900176 SG_ALL * sizeof(struct srp_direct_buf),
James Bottomley4dddbc22005-09-06 17:11:54 -0500177 pool->events[i].ext_list,
178 pool->events[i].ext_list_token);
179 }
180 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (in_use)
Brian King6c0a60e2007-06-13 17:12:19 -0500182 dev_warn(hostdata->dev, "releasing event pool with %d "
183 "events still in use?\n", in_use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 kfree(pool->events);
185 dma_free_coherent(hostdata->dev,
186 pool->size * sizeof(*pool->iu_storage),
187 pool->iu_storage, pool->iu_token);
188}
189
190/**
191 * valid_event_struct: - Determines if event is valid.
192 * @pool: event_pool that contains the event
193 * @evt: srp_event_struct to be checked for validity
194 *
195 * Returns zero if event is invalid, one otherwise.
196*/
197static int valid_event_struct(struct event_pool *pool,
198 struct srp_event_struct *evt)
199{
200 int index = evt - pool->events;
201 if (index < 0 || index >= pool->size) /* outside of bounds */
202 return 0;
203 if (evt != pool->events + index) /* unaligned */
204 return 0;
205 return 1;
206}
207
208/**
209 * ibmvscsi_free-event_struct: - Changes status of event to "free"
210 * @pool: event_pool that contains the event
211 * @evt: srp_event_struct to be modified
212 *
213*/
214static void free_event_struct(struct event_pool *pool,
215 struct srp_event_struct *evt)
216{
217 if (!valid_event_struct(pool, evt)) {
Brian King6c0a60e2007-06-13 17:12:19 -0500218 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
219 "(not in pool %p)\n", evt, pool->events);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 return;
221 }
222 if (atomic_inc_return(&evt->free) != 1) {
Brian King6c0a60e2007-06-13 17:12:19 -0500223 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
224 "which is not in use!\n", evt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return;
226 }
227}
228
229/**
230 * get_evt_struct: - Gets the next free event in pool
231 * @pool: event_pool that contains the events to be searched
232 *
233 * Returns the next event in "free" state, and NULL if none are free.
234 * Note that no synchronization is done here, we assume the host_lock
235 * will syncrhonze things.
236*/
237static struct srp_event_struct *get_event_struct(struct event_pool *pool)
238{
239 int i;
240 int poolsize = pool->size;
241 int offset = pool->next;
242
243 for (i = 0; i < poolsize; i++) {
244 offset = (offset + 1) % poolsize;
245 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
246 pool->next = offset;
247 return &pool->events[offset];
248 }
249 }
250
251 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
252 return NULL;
253}
254
255/**
256 * init_event_struct: Initialize fields in an event struct that are always
257 * required.
258 * @evt: The event
259 * @done: Routine to call when the event is responded to
260 * @format: SRP or MAD format
261 * @timeout: timeout value set in the CRQ
262 */
263static void init_event_struct(struct srp_event_struct *evt_struct,
264 void (*done) (struct srp_event_struct *),
265 u8 format,
266 int timeout)
267{
268 evt_struct->cmnd = NULL;
269 evt_struct->cmnd_done = NULL;
270 evt_struct->sync_srp = NULL;
271 evt_struct->crq.format = format;
272 evt_struct->crq.timeout = timeout;
273 evt_struct->done = done;
274}
275
276/* ------------------------------------------------------------
277 * Routines for receiving SCSI responses from the hosting partition
278 */
279
280/**
281 * set_srp_direction: Set the fields in the srp related to data
282 * direction and number of buffers based on the direction in
283 * the scsi_cmnd and the number of buffers
284 */
285static void set_srp_direction(struct scsi_cmnd *cmd,
286 struct srp_cmd *srp_cmd,
287 int numbuf)
288{
FUJITA Tomonorief265672006-03-26 03:57:14 +0900289 u8 fmt;
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 if (numbuf == 0)
292 return;
293
FUJITA Tomonorief265672006-03-26 03:57:14 +0900294 if (numbuf == 1)
295 fmt = SRP_DATA_DESC_DIRECT;
296 else {
297 fmt = SRP_DATA_DESC_INDIRECT;
298 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 if (cmd->sc_data_direction == DMA_TO_DEVICE)
FUJITA Tomonorief265672006-03-26 03:57:14 +0900301 srp_cmd->data_out_desc_cnt = numbuf;
302 else
303 srp_cmd->data_in_desc_cnt = numbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 }
FUJITA Tomonorief265672006-03-26 03:57:14 +0900305
306 if (cmd->sc_data_direction == DMA_TO_DEVICE)
307 srp_cmd->buf_fmt = fmt << 4;
308 else
309 srp_cmd->buf_fmt = fmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
FUJITA Tomonorief265672006-03-26 03:57:14 +0900312static void unmap_sg_list(int num_entries,
James Bottomley4dddbc22005-09-06 17:11:54 -0500313 struct device *dev,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900314 struct srp_direct_buf *md)
315{
James Bottomley4dddbc22005-09-06 17:11:54 -0500316 int i;
317
FUJITA Tomonorief265672006-03-26 03:57:14 +0900318 for (i = 0; i < num_entries; ++i)
319 dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL);
James Bottomley4dddbc22005-09-06 17:11:54 -0500320}
321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322/**
323 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
324 * @cmd: srp_cmd whose additional_data member will be unmapped
325 * @dev: device for which the memory is mapped
326 *
327*/
James Bottomley4dddbc22005-09-06 17:11:54 -0500328static void unmap_cmd_data(struct srp_cmd *cmd,
329 struct srp_event_struct *evt_struct,
330 struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
FUJITA Tomonorief265672006-03-26 03:57:14 +0900332 u8 out_fmt, in_fmt;
333
334 out_fmt = cmd->buf_fmt >> 4;
335 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
336
337 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 return;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900339 else if (out_fmt == SRP_DATA_DESC_DIRECT ||
340 in_fmt == SRP_DATA_DESC_DIRECT) {
341 struct srp_direct_buf *data =
342 (struct srp_direct_buf *) cmd->add_data;
343 dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 } else {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900345 struct srp_indirect_buf *indirect =
346 (struct srp_indirect_buf *) cmd->add_data;
347 int num_mapped = indirect->table_desc.len /
348 sizeof(struct srp_direct_buf);
James Bottomley4dddbc22005-09-06 17:11:54 -0500349
350 if (num_mapped <= MAX_INDIRECT_BUFS) {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900351 unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]);
James Bottomley4dddbc22005-09-06 17:11:54 -0500352 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 }
James Bottomley4dddbc22005-09-06 17:11:54 -0500354
355 unmap_sg_list(num_mapped, dev, evt_struct->ext_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 }
357}
358
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900359static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900360 struct srp_direct_buf *md)
James Bottomley4dddbc22005-09-06 17:11:54 -0500361{
362 int i;
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900363 struct scatterlist *sg;
James Bottomley4dddbc22005-09-06 17:11:54 -0500364 u64 total_length = 0;
365
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900366 scsi_for_each_sg(cmd, sg, nseg, i) {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900367 struct srp_direct_buf *descr = md + i;
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900368 descr->va = sg_dma_address(sg);
369 descr->len = sg_dma_len(sg);
FUJITA Tomonorief265672006-03-26 03:57:14 +0900370 descr->key = 0;
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900371 total_length += sg_dma_len(sg);
James Bottomley4dddbc22005-09-06 17:11:54 -0500372 }
373 return total_length;
374}
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376/**
377 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
378 * @cmd: Scsi_Cmnd with the scatterlist
379 * @srp_cmd: srp_cmd that contains the memory descriptor
380 * @dev: device for which to map dma memory
381 *
382 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
383 * Returns 1 on success.
384*/
385static int map_sg_data(struct scsi_cmnd *cmd,
James Bottomley4dddbc22005-09-06 17:11:54 -0500386 struct srp_event_struct *evt_struct,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 struct srp_cmd *srp_cmd, struct device *dev)
388{
389
James Bottomley4dddbc22005-09-06 17:11:54 -0500390 int sg_mapped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 u64 total_length = 0;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900392 struct srp_direct_buf *data =
393 (struct srp_direct_buf *) srp_cmd->add_data;
394 struct srp_indirect_buf *indirect =
395 (struct srp_indirect_buf *) data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900397 sg_mapped = scsi_dma_map(cmd);
398 if (!sg_mapped)
399 return 1;
400 else if (sg_mapped < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 return 0;
402
403 set_srp_direction(cmd, srp_cmd, sg_mapped);
404
405 /* special case; we can use a single direct descriptor */
406 if (sg_mapped == 1) {
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900407 map_sg_list(cmd, sg_mapped, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 return 1;
409 }
410
FUJITA Tomonorief265672006-03-26 03:57:14 +0900411 indirect->table_desc.va = 0;
412 indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf);
413 indirect->table_desc.key = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
James Bottomley4dddbc22005-09-06 17:11:54 -0500415 if (sg_mapped <= MAX_INDIRECT_BUFS) {
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900416 total_length = map_sg_list(cmd, sg_mapped,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900417 &indirect->desc_list[0]);
418 indirect->len = total_length;
James Bottomley4dddbc22005-09-06 17:11:54 -0500419 return 1;
420 }
421
422 /* get indirect table */
423 if (!evt_struct->ext_list) {
FUJITA Tomonorief265672006-03-26 03:57:14 +0900424 evt_struct->ext_list = (struct srp_direct_buf *)
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900425 dma_alloc_coherent(dev,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900426 SG_ALL * sizeof(struct srp_direct_buf),
427 &evt_struct->ext_list_token, 0);
James Bottomley4dddbc22005-09-06 17:11:54 -0500428 if (!evt_struct->ext_list) {
Brian King6c0a60e2007-06-13 17:12:19 -0500429 sdev_printk(KERN_ERR, cmd->device,
430 "Can't allocate memory for indirect table\n");
James Bottomley4dddbc22005-09-06 17:11:54 -0500431 return 0;
James Bottomley4dddbc22005-09-06 17:11:54 -0500432 }
433 }
434
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900435 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
James Bottomley4dddbc22005-09-06 17:11:54 -0500436
FUJITA Tomonorief265672006-03-26 03:57:14 +0900437 indirect->len = total_length;
438 indirect->table_desc.va = evt_struct->ext_list_token;
439 indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
440 memcpy(indirect->desc_list, evt_struct->ext_list,
441 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
James Bottomley4dddbc22005-09-06 17:11:54 -0500442 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443}
444
445/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
447 * @cmd: struct scsi_cmnd with the memory to be mapped
448 * @srp_cmd: srp_cmd that contains the memory descriptor
449 * @dev: dma device for which to map dma memory
450 *
451 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
452 * Returns 1 on success.
453*/
454static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
James Bottomley4dddbc22005-09-06 17:11:54 -0500455 struct srp_event_struct *evt_struct,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 struct srp_cmd *srp_cmd, struct device *dev)
457{
458 switch (cmd->sc_data_direction) {
459 case DMA_FROM_DEVICE:
460 case DMA_TO_DEVICE:
461 break;
462 case DMA_NONE:
463 return 1;
464 case DMA_BIDIRECTIONAL:
Brian King6c0a60e2007-06-13 17:12:19 -0500465 sdev_printk(KERN_ERR, cmd->device,
466 "Can't map DMA_BIDIRECTIONAL to read/write\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 return 0;
468 default:
Brian King6c0a60e2007-06-13 17:12:19 -0500469 sdev_printk(KERN_ERR, cmd->device,
470 "Unknown data direction 0x%02x; can't map!\n",
471 cmd->sc_data_direction);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 return 0;
473 }
474
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900475 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476}
477
Brian King3d0e91f2007-06-13 17:12:26 -0500478/**
479 * purge_requests: Our virtual adapter just shut down. purge any sent requests
480 * @hostdata: the adapter
481 */
482static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
483{
484 struct srp_event_struct *tmp_evt, *pos;
485 unsigned long flags;
486
487 spin_lock_irqsave(hostdata->host->host_lock, flags);
488 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
489 list_del(&tmp_evt->list);
490 del_timer(&tmp_evt->timer);
491 if (tmp_evt->cmnd) {
492 tmp_evt->cmnd->result = (error_code << 16);
493 unmap_cmd_data(&tmp_evt->iu.srp.cmd,
494 tmp_evt,
495 tmp_evt->hostdata->dev);
496 if (tmp_evt->cmnd_done)
497 tmp_evt->cmnd_done(tmp_evt->cmnd);
498 } else if (tmp_evt->done)
499 tmp_evt->done(tmp_evt);
500 free_event_struct(&tmp_evt->hostdata->pool, tmp_evt);
501 }
502 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
503}
504
505/**
506 * ibmvscsi_reset_host - Reset the connection to the server
507 * @hostdata: struct ibmvscsi_host_data to reset
508*/
509static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
510{
511 scsi_block_requests(hostdata->host);
512 atomic_set(&hostdata->request_limit, 0);
513
514 purge_requests(hostdata, DID_ERROR);
David Woodhoused3849d52007-09-22 08:29:36 +1000515 if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata)) ||
516 (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0)) ||
Brian King3d0e91f2007-06-13 17:12:26 -0500517 (vio_enable_interrupts(to_vio_dev(hostdata->dev)))) {
518 atomic_set(&hostdata->request_limit, -1);
519 dev_err(hostdata->dev, "error after reset\n");
520 }
521
522 scsi_unblock_requests(hostdata->host);
523}
524
525/**
526 * ibmvscsi_timeout - Internal command timeout handler
527 * @evt_struct: struct srp_event_struct that timed out
528 *
529 * Called when an internally generated command times out
530*/
531static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
532{
533 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
534
535 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
536 evt_struct->iu.srp.cmd.opcode);
537
538 ibmvscsi_reset_host(hostdata);
539}
540
541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542/* ------------------------------------------------------------
543 * Routines for sending and receiving SRPs
544 */
545/**
546 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
547 * @evt_struct: evt_struct to be sent
548 * @hostdata: ibmvscsi_host_data of host
Brian King3d0e91f2007-06-13 17:12:26 -0500549 * @timeout: timeout in seconds - 0 means do not time command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 *
551 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
552 * Note that this routine assumes that host_lock is held for synchronization
553*/
554static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
Brian King3d0e91f2007-06-13 17:12:26 -0500555 struct ibmvscsi_host_data *hostdata,
556 unsigned long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
Robert Jennings3c887e82007-10-30 11:37:07 -0500559 int request_status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 int rc;
561
Robert Jenningsa897ff22007-03-28 12:45:46 -0500562 /* If we have exhausted our request limit, just fail this request,
563 * unless it is for a reset or abort.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 * Note that there are rare cases involving driver generated requests
565 * (such as task management requests) that the mid layer may think we
566 * can handle more requests (can_queue) when we actually can't
567 */
Dave C Boutchercefbda22006-06-12 21:22:51 -0500568 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
569 request_status =
570 atomic_dec_if_positive(&hostdata->request_limit);
571 /* If request limit was -1 when we started, it is now even
572 * less than that
573 */
574 if (request_status < -1)
575 goto send_error;
Robert Jenningsa897ff22007-03-28 12:45:46 -0500576 /* Otherwise, we may have run out of requests. */
Robert Jennings3c887e82007-10-30 11:37:07 -0500577 /* If request limit was 0 when we started the adapter is in the
578 * process of performing a login with the server adapter, or
579 * we may have run out of requests.
580 */
581 else if (request_status == -1 &&
582 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
583 goto send_busy;
Robert Jenningsa897ff22007-03-28 12:45:46 -0500584 /* Abort and reset calls should make it through.
585 * Nothing except abort and reset should use the last two
586 * slots unless we had two or less to begin with.
587 */
588 else if (request_status < 2 &&
589 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
590 /* In the case that we have less than two requests
591 * available, check the server limit as a combination
592 * of the request limit and the number of requests
593 * in-flight (the size of the send list). If the
594 * server limit is greater than 2, return busy so
595 * that the last two are reserved for reset and abort.
596 */
597 int server_limit = request_status;
598 struct srp_event_struct *tmp_evt;
599
600 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
601 server_limit++;
602 }
603
604 if (server_limit > 2)
605 goto send_busy;
606 }
Dave C Boutchercefbda22006-06-12 21:22:51 -0500607 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
609 /* Copy the IU into the transfer area */
610 *evt_struct->xfer_iu = evt_struct->iu;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900611 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
613 /* Add this to the sent list. We need to do this
614 * before we actually send
615 * in case it comes back REALLY fast
616 */
617 list_add_tail(&evt_struct->list, &hostdata->sent);
618
Brian King3d0e91f2007-06-13 17:12:26 -0500619 init_timer(&evt_struct->timer);
620 if (timeout) {
621 evt_struct->timer.data = (unsigned long) evt_struct;
622 evt_struct->timer.expires = jiffies + (timeout * HZ);
623 evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
624 add_timer(&evt_struct->timer);
625 }
626
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 if ((rc =
David Woodhoused3849d52007-09-22 08:29:36 +1000628 ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 list_del(&evt_struct->list);
Brian King3d0e91f2007-06-13 17:12:26 -0500630 del_timer(&evt_struct->timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
Robert Jennings860784c2007-11-12 09:00:23 -0600632 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
633 * Firmware will send a CRQ with a transport event (0xFF) to
634 * tell this client what has happened to the transport. This
635 * will be handled in ibmvscsi_handle_crq()
636 */
637 if (rc == H_CLOSED) {
638 dev_warn(hostdata->dev, "send warning. "
639 "Receive queue closed, will retry.\n");
640 goto send_busy;
641 }
Brian King6c0a60e2007-06-13 17:12:19 -0500642 dev_err(hostdata->dev, "send error %d\n", rc);
Robert Jenningsa897ff22007-03-28 12:45:46 -0500643 atomic_inc(&hostdata->request_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 goto send_error;
645 }
646
647 return 0;
648
Dave C Boutchercefbda22006-06-12 21:22:51 -0500649 send_busy:
James Bottomley4dddbc22005-09-06 17:11:54 -0500650 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 free_event_struct(&hostdata->pool, evt_struct);
Robert Jennings3c887e82007-10-30 11:37:07 -0500653 if (request_status != -1)
654 atomic_inc(&hostdata->request_limit);
Robert Jenningsa897ff22007-03-28 12:45:46 -0500655 return SCSI_MLQUEUE_HOST_BUSY;
Dave C Boutchercefbda22006-06-12 21:22:51 -0500656
657 send_error:
658 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
659
660 if (evt_struct->cmnd != NULL) {
661 evt_struct->cmnd->result = DID_ERROR << 16;
662 evt_struct->cmnd_done(evt_struct->cmnd);
663 } else if (evt_struct->done)
664 evt_struct->done(evt_struct);
665
666 free_event_struct(&hostdata->pool, evt_struct);
667 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668}
669
670/**
671 * handle_cmd_rsp: - Handle responses from commands
672 * @evt_struct: srp_event_struct to be handled
673 *
674 * Used as a callback by when sending scsi cmds.
675 * Gets called by ibmvscsi_handle_crq()
676*/
677static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
678{
679 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
680 struct scsi_cmnd *cmnd = evt_struct->cmnd;
681
FUJITA Tomonorief265672006-03-26 03:57:14 +0900682 if (unlikely(rsp->opcode != SRP_RSP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -0500684 dev_warn(evt_struct->hostdata->dev,
685 "bad SRP RSP type %d\n", rsp->opcode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 }
687
688 if (cmnd) {
689 cmnd->result = rsp->status;
690 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
691 memcpy(cmnd->sense_buffer,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900692 rsp->data,
693 rsp->sense_data_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 unmap_cmd_data(&evt_struct->iu.srp.cmd,
James Bottomley4dddbc22005-09-06 17:11:54 -0500695 evt_struct,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 evt_struct->hostdata->dev);
697
FUJITA Tomonorief265672006-03-26 03:57:14 +0900698 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900699 scsi_set_resid(cmnd, rsp->data_out_res_cnt);
FUJITA Tomonorief265672006-03-26 03:57:14 +0900700 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
FUJITA Tomonori9413d7b2007-05-26 00:32:58 +0900701 scsi_set_resid(cmnd, rsp->data_in_res_cnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 }
703
704 if (evt_struct->cmnd_done)
705 evt_struct->cmnd_done(cmnd);
706}
707
708/**
709 * lun_from_dev: - Returns the lun of the scsi device
710 * @dev: struct scsi_device
711 *
712*/
713static inline u16 lun_from_dev(struct scsi_device *dev)
714{
715 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
716}
717
718/**
719 * ibmvscsi_queue: - The queuecommand function of the scsi template
720 * @cmd: struct scsi_cmnd to be executed
721 * @done: Callback function to be called when cmd is completed
722*/
723static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
724 void (*done) (struct scsi_cmnd *))
725{
726 struct srp_cmd *srp_cmd;
727 struct srp_event_struct *evt_struct;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900728 struct srp_indirect_buf *indirect;
FUJITA Tomonori7603e022007-07-23 09:28:40 +0900729 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 u16 lun = lun_from_dev(cmnd->device);
FUJITA Tomonorief265672006-03-26 03:57:14 +0900731 u8 out_fmt, in_fmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
733 evt_struct = get_event_struct(&hostdata->pool);
734 if (!evt_struct)
735 return SCSI_MLQUEUE_HOST_BUSY;
736
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 /* Set up the actual SRP IU */
738 srp_cmd = &evt_struct->iu.srp.cmd;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900739 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
740 srp_cmd->opcode = SRP_CMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd));
742 srp_cmd->lun = ((u64) lun) << 48;
743
James Bottomley4dddbc22005-09-06 17:11:54 -0500744 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
Brian King6c0a60e2007-06-13 17:12:19 -0500745 sdev_printk(KERN_ERR, cmnd->device, "couldn't convert cmd to srp_cmd\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 free_event_struct(&hostdata->pool, evt_struct);
747 return SCSI_MLQUEUE_HOST_BUSY;
748 }
749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 init_event_struct(evt_struct,
751 handle_cmd_rsp,
752 VIOSRP_SRP_FORMAT,
Dave C Boutcher8224bfa2005-08-22 14:38:26 -0500753 cmnd->timeout_per_command/HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
755 evt_struct->cmnd = cmnd;
756 evt_struct->cmnd_done = done;
757
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 /* Fix up dma address of the buffer itself */
FUJITA Tomonorief265672006-03-26 03:57:14 +0900759 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
760 out_fmt = srp_cmd->buf_fmt >> 4;
761 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
762 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
763 out_fmt == SRP_DATA_DESC_INDIRECT) &&
764 indirect->table_desc.va == 0) {
765 indirect->table_desc.va = evt_struct->crq.IU_data_ptr +
766 offsetof(struct srp_cmd, add_data) +
767 offsetof(struct srp_indirect_buf, desc_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 }
769
Brian King3d0e91f2007-06-13 17:12:26 -0500770 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771}
772
773/* ------------------------------------------------------------
774 * Routines for driver initialization
775 */
776/**
777 * adapter_info_rsp: - Handle response to MAD adapter info request
778 * @evt_struct: srp_event_struct with the response
779 *
780 * Used as a "done" callback by when sending adapter_info. Gets called
781 * by ibmvscsi_handle_crq()
782*/
783static void adapter_info_rsp(struct srp_event_struct *evt_struct)
784{
785 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
786 dma_unmap_single(hostdata->dev,
787 evt_struct->iu.mad.adapter_info.buffer,
788 evt_struct->iu.mad.adapter_info.common.length,
789 DMA_BIDIRECTIONAL);
790
791 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
Brian King6c0a60e2007-06-13 17:12:19 -0500792 dev_err(hostdata->dev, "error %d getting adapter info\n",
793 evt_struct->xfer_iu->mad.adapter_info.common.status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 } else {
Brian King6c0a60e2007-06-13 17:12:19 -0500795 dev_info(hostdata->dev, "host srp version: %s, "
796 "host partition %s (%d), OS %d, max io %u\n",
797 hostdata->madapter_info.srp_version,
798 hostdata->madapter_info.partition_name,
799 hostdata->madapter_info.partition_number,
800 hostdata->madapter_info.os_type,
801 hostdata->madapter_info.port_max_txu[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
803 if (hostdata->madapter_info.port_max_txu[0])
804 hostdata->host->max_sectors =
805 hostdata->madapter_info.port_max_txu[0] >> 9;
Dave C Boutcher154fb612005-09-13 10:09:02 -0500806
807 if (hostdata->madapter_info.os_type == 3 &&
808 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
Brian King6c0a60e2007-06-13 17:12:19 -0500809 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
810 hostdata->madapter_info.srp_version);
811 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
812 MAX_INDIRECT_BUFS);
Dave C Boutcher154fb612005-09-13 10:09:02 -0500813 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
814 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 }
816}
817
818/**
819 * send_mad_adapter_info: - Sends the mad adapter info request
820 * and stores the result so it can be retrieved with
821 * sysfs. We COULD consider causing a failure if the
822 * returned SRP version doesn't match ours.
823 * @hostdata: ibmvscsi_host_data of host
824 *
825 * Returns zero if successful.
826*/
827static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
828{
829 struct viosrp_adapter_info *req;
830 struct srp_event_struct *evt_struct;
Brian King06f923c2007-06-13 17:12:33 -0500831 unsigned long flags;
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +0900832 dma_addr_t addr;
833
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 evt_struct = get_event_struct(&hostdata->pool);
835 if (!evt_struct) {
Brian King6c0a60e2007-06-13 17:12:19 -0500836 dev_err(hostdata->dev,
837 "couldn't allocate an event for ADAPTER_INFO_REQ!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 return;
839 }
840
841 init_event_struct(evt_struct,
842 adapter_info_rsp,
843 VIOSRP_MAD_FORMAT,
FUJITA Tomonori33874a02007-05-22 13:50:51 +0900844 init_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
846 req = &evt_struct->iu.mad.adapter_info;
847 memset(req, 0x00, sizeof(*req));
848
849 req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
850 req->common.length = sizeof(hostdata->madapter_info);
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +0900851 req->buffer = addr = dma_map_single(hostdata->dev,
852 &hostdata->madapter_info,
853 sizeof(hostdata->madapter_info),
854 DMA_BIDIRECTIONAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
856 if (dma_mapping_error(req->buffer)) {
Brian King6c0a60e2007-06-13 17:12:19 -0500857 dev_err(hostdata->dev, "Unable to map request_buffer for adapter_info!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 free_event_struct(&hostdata->pool, evt_struct);
859 return;
860 }
861
Brian King06f923c2007-06-13 17:12:33 -0500862 spin_lock_irqsave(hostdata->host->host_lock, flags);
Brian King3d0e91f2007-06-13 17:12:26 -0500863 if (ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2)) {
Brian King6c0a60e2007-06-13 17:12:19 -0500864 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +0900865 dma_unmap_single(hostdata->dev,
866 addr,
867 sizeof(hostdata->madapter_info),
868 DMA_BIDIRECTIONAL);
869 }
Brian King06f923c2007-06-13 17:12:33 -0500870 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871};
872
873/**
874 * login_rsp: - Handle response to SRP login request
875 * @evt_struct: srp_event_struct with the response
876 *
877 * Used as a "done" callback by when sending srp_login. Gets called
878 * by ibmvscsi_handle_crq()
879*/
880static void login_rsp(struct srp_event_struct *evt_struct)
881{
882 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900883 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
884 case SRP_LOGIN_RSP: /* it worked! */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 break;
FUJITA Tomonorief265672006-03-26 03:57:14 +0900886 case SRP_LOGIN_REJ: /* refused! */
Brian King6c0a60e2007-06-13 17:12:19 -0500887 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
888 evt_struct->xfer_iu->srp.login_rej.reason);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 /* Login failed. */
890 atomic_set(&hostdata->request_limit, -1);
891 return;
892 default:
Brian King6c0a60e2007-06-13 17:12:19 -0500893 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
894 evt_struct->xfer_iu->srp.login_rsp.opcode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 /* Login failed. */
896 atomic_set(&hostdata->request_limit, -1);
897 return;
898 }
899
Brian King6c0a60e2007-06-13 17:12:19 -0500900 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
Robert Jenningsa897ff22007-03-28 12:45:46 -0500902 if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta < 0)
Brian King6c0a60e2007-06-13 17:12:19 -0500903 dev_err(hostdata->dev, "Invalid request_limit.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
Robert Jenningsa897ff22007-03-28 12:45:46 -0500905 /* Now we know what the real request-limit is.
906 * This value is set rather than added to request_limit because
907 * request_limit could have been set to -1 by this client.
908 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 atomic_set(&hostdata->request_limit,
FUJITA Tomonorief265672006-03-26 03:57:14 +0900910 evt_struct->xfer_iu->srp.login_rsp.req_lim_delta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
Dave C Boutcher2b541f82006-01-19 13:34:44 -0600912 /* If we had any pending I/Os, kick them */
913 scsi_unblock_requests(hostdata->host);
914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 send_mad_adapter_info(hostdata);
916 return;
917}
918
919/**
920 * send_srp_login: - Sends the srp login
921 * @hostdata: ibmvscsi_host_data of host
922 *
923 * Returns zero if successful.
924*/
925static int send_srp_login(struct ibmvscsi_host_data *hostdata)
926{
927 int rc;
928 unsigned long flags;
929 struct srp_login_req *login;
930 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
931 if (!evt_struct) {
Brian King6c0a60e2007-06-13 17:12:19 -0500932 dev_err(hostdata->dev, "couldn't allocate an event for login req!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 return FAILED;
934 }
935
936 init_event_struct(evt_struct,
937 login_rsp,
938 VIOSRP_SRP_FORMAT,
FUJITA Tomonori33874a02007-05-22 13:50:51 +0900939 init_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941 login = &evt_struct->iu.srp.login_req;
Dave C Boutcher2b541f82006-01-19 13:34:44 -0600942 memset(login, 0x00, sizeof(struct srp_login_req));
FUJITA Tomonorief265672006-03-26 03:57:14 +0900943 login->opcode = SRP_LOGIN_REQ;
944 login->req_it_iu_len = sizeof(union srp_iu);
945 login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946
Dave C Boutcher9b833e42006-03-23 13:47:07 -0600947 spin_lock_irqsave(hostdata->host->host_lock, flags);
Robert Jennings3c887e82007-10-30 11:37:07 -0500948 /* Start out with a request limit of 0, since this is negotiated in
949 * the login request we are just sending and login requests always
950 * get sent by the driver regardless of request_limit.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 */
Robert Jennings3c887e82007-10-30 11:37:07 -0500952 atomic_set(&hostdata->request_limit, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
Brian King3d0e91f2007-06-13 17:12:26 -0500954 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Brian King6c0a60e2007-06-13 17:12:19 -0500956 dev_info(hostdata->dev, "sent SRP login\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 return rc;
958};
959
960/**
961 * sync_completion: Signal that a synchronous command has completed
962 * Note that after returning from this call, the evt_struct is freed.
963 * the caller waiting on this completion shouldn't touch the evt_struct
964 * again.
965 */
966static void sync_completion(struct srp_event_struct *evt_struct)
967{
968 /* copy the response back */
969 if (evt_struct->sync_srp)
970 *evt_struct->sync_srp = *evt_struct->xfer_iu;
971
972 complete(&evt_struct->comp);
973}
974
975/**
976 * ibmvscsi_abort: Abort a command...from scsi host template
977 * send this over to the server and wait synchronously for the response
978 */
979static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
980{
FUJITA Tomonori7603e022007-07-23 09:28:40 +0900981 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 struct srp_tsk_mgmt *tsk_mgmt;
983 struct srp_event_struct *evt;
984 struct srp_event_struct *tmp_evt, *found_evt;
985 union viosrp_iu srp_rsp;
986 int rsp_rc;
Dave C Boutcherbe042f22005-08-15 16:52:58 -0500987 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 u16 lun = lun_from_dev(cmd->device);
Robert Jennings860784c2007-11-12 09:00:23 -0600989 unsigned long wait_switch = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
991 /* First, find this command in our sent list so we can figure
992 * out the correct tag
993 */
Dave C Boutcherbe042f22005-08-15 16:52:58 -0500994 spin_lock_irqsave(hostdata->host->host_lock, flags);
Robert Jennings860784c2007-11-12 09:00:23 -0600995 wait_switch = jiffies + (init_timeout * HZ);
996 do {
997 found_evt = NULL;
998 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
999 if (tmp_evt->cmnd == cmd) {
1000 found_evt = tmp_evt;
1001 break;
1002 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
Robert Jennings860784c2007-11-12 09:00:23 -06001005 if (!found_evt) {
1006 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1007 return SUCCESS;
1008 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009
Robert Jennings860784c2007-11-12 09:00:23 -06001010 evt = get_event_struct(&hostdata->pool);
1011 if (evt == NULL) {
1012 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1013 sdev_printk(KERN_ERR, cmd->device,
1014 "failed to allocate abort event\n");
1015 return FAILED;
1016 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
Robert Jennings860784c2007-11-12 09:00:23 -06001018 init_event_struct(evt,
1019 sync_completion,
1020 VIOSRP_SRP_FORMAT,
1021 init_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
Robert Jennings860784c2007-11-12 09:00:23 -06001023 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Robert Jennings860784c2007-11-12 09:00:23 -06001025 /* Set up an abort SRP command */
1026 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1027 tsk_mgmt->opcode = SRP_TSK_MGMT;
1028 tsk_mgmt->lun = ((u64) lun) << 48;
1029 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1030 tsk_mgmt->task_tag = (u64) found_evt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031
Robert Jennings860784c2007-11-12 09:00:23 -06001032 evt->sync_srp = &srp_rsp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
Robert Jennings860784c2007-11-12 09:00:23 -06001034 init_completion(&evt->comp);
1035 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2);
1036
1037 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1038 break;
1039
1040 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1041 msleep(10);
1042 spin_lock_irqsave(hostdata->host->host_lock, flags);
1043 } while (time_before(jiffies, wait_switch));
1044
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001045 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Robert Jennings860784c2007-11-12 09:00:23 -06001046
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001047 if (rsp_rc != 0) {
Brian King6c0a60e2007-06-13 17:12:19 -05001048 sdev_printk(KERN_ERR, cmd->device,
1049 "failed to send abort() event. rc=%d\n", rsp_rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 return FAILED;
1051 }
1052
Robert Jennings860784c2007-11-12 09:00:23 -06001053 sdev_printk(KERN_INFO, cmd->device,
1054 "aborting command. lun 0x%lx, tag 0x%lx\n",
1055 (((u64) lun) << 48), (u64) found_evt);
1056
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 wait_for_completion(&evt->comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058
1059 /* make sure we got a good response */
FUJITA Tomonorief265672006-03-26 03:57:14 +09001060 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -05001062 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1063 srp_rsp.srp.rsp.opcode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 return FAILED;
1065 }
1066
FUJITA Tomonorief265672006-03-26 03:57:14 +09001067 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1068 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 else
1070 rsp_rc = srp_rsp.srp.rsp.status;
1071
1072 if (rsp_rc) {
1073 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -05001074 sdev_printk(KERN_WARNING, cmd->device,
1075 "abort code %d for task tag 0x%lx\n",
1076 rsp_rc, tsk_mgmt->task_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 return FAILED;
1078 }
1079
1080 /* Because we dropped the spinlock above, it's possible
1081 * The event is no longer in our list. Make sure it didn't
1082 * complete while we were aborting
1083 */
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001084 spin_lock_irqsave(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 found_evt = NULL;
1086 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1087 if (tmp_evt->cmnd == cmd) {
1088 found_evt = tmp_evt;
1089 break;
1090 }
1091 }
1092
1093 if (found_evt == NULL) {
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001094 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Brian King6c0a60e2007-06-13 17:12:19 -05001095 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%lx completed\n",
1096 tsk_mgmt->task_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 return SUCCESS;
1098 }
1099
Brian King6c0a60e2007-06-13 17:12:19 -05001100 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%lx\n",
1101 tsk_mgmt->task_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102
1103 cmd->result = (DID_ABORT << 16);
1104 list_del(&found_evt->list);
James Bottomley4dddbc22005-09-06 17:11:54 -05001105 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1106 found_evt->hostdata->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 free_event_struct(&found_evt->hostdata->pool, found_evt);
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001108 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 atomic_inc(&hostdata->request_limit);
1110 return SUCCESS;
1111}
1112
1113/**
1114 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1115 * template send this over to the server and wait synchronously for the
1116 * response
1117 */
1118static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1119{
FUJITA Tomonori7603e022007-07-23 09:28:40 +09001120 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 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);
Robert Jennings860784c2007-11-12 09:00:23 -06001128 unsigned long wait_switch = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001130 spin_lock_irqsave(hostdata->host->host_lock, flags);
Robert Jennings860784c2007-11-12 09:00:23 -06001131 wait_switch = jiffies + (init_timeout * HZ);
1132 do {
1133 evt = get_event_struct(&hostdata->pool);
1134 if (evt == NULL) {
1135 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1136 sdev_printk(KERN_ERR, cmd->device,
1137 "failed to allocate reset event\n");
1138 return FAILED;
1139 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140
Robert Jennings860784c2007-11-12 09:00:23 -06001141 init_event_struct(evt,
1142 sync_completion,
1143 VIOSRP_SRP_FORMAT,
1144 init_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145
Robert Jennings860784c2007-11-12 09:00:23 -06001146 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147
Robert Jennings860784c2007-11-12 09:00:23 -06001148 /* Set up a lun reset SRP command */
1149 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1150 tsk_mgmt->opcode = SRP_TSK_MGMT;
1151 tsk_mgmt->lun = ((u64) lun) << 48;
1152 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
Robert Jennings860784c2007-11-12 09:00:23 -06001154 evt->sync_srp = &srp_rsp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
Robert Jennings860784c2007-11-12 09:00:23 -06001156 init_completion(&evt->comp);
1157 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2);
1158
1159 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1160 break;
1161
1162 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1163 msleep(10);
1164 spin_lock_irqsave(hostdata->host->host_lock, flags);
1165 } while (time_before(jiffies, wait_switch));
1166
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001167 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Robert Jennings860784c2007-11-12 09:00:23 -06001168
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001169 if (rsp_rc != 0) {
Brian King6c0a60e2007-06-13 17:12:19 -05001170 sdev_printk(KERN_ERR, cmd->device,
1171 "failed to send reset event. rc=%d\n", rsp_rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 return FAILED;
1173 }
1174
Robert Jennings860784c2007-11-12 09:00:23 -06001175 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%lx\n",
1176 (((u64) lun) << 48));
1177
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 wait_for_completion(&evt->comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179
1180 /* make sure we got a good response */
FUJITA Tomonorief265672006-03-26 03:57:14 +09001181 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -05001183 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1184 srp_rsp.srp.rsp.opcode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 return FAILED;
1186 }
1187
FUJITA Tomonorief265672006-03-26 03:57:14 +09001188 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1189 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 else
1191 rsp_rc = srp_rsp.srp.rsp.status;
1192
1193 if (rsp_rc) {
1194 if (printk_ratelimit())
Brian King6c0a60e2007-06-13 17:12:19 -05001195 sdev_printk(KERN_WARNING, cmd->device,
1196 "reset code %d for task tag 0x%lx\n",
1197 rsp_rc, tsk_mgmt->task_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 return FAILED;
1199 }
1200
1201 /* We need to find all commands for this LUN that have not yet been
1202 * responded to, and fail them with DID_RESET
1203 */
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001204 spin_lock_irqsave(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1206 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1207 if (tmp_evt->cmnd)
1208 tmp_evt->cmnd->result = (DID_RESET << 16);
1209 list_del(&tmp_evt->list);
James Bottomley4dddbc22005-09-06 17:11:54 -05001210 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1211 tmp_evt->hostdata->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 free_event_struct(&tmp_evt->hostdata->pool,
1213 tmp_evt);
1214 atomic_inc(&hostdata->request_limit);
1215 if (tmp_evt->cmnd_done)
1216 tmp_evt->cmnd_done(tmp_evt->cmnd);
1217 else if (tmp_evt->done)
1218 tmp_evt->done(tmp_evt);
1219 }
1220 }
Dave C Boutcherbe042f22005-08-15 16:52:58 -05001221 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 return SUCCESS;
1223}
1224
1225/**
Brian King3d0e91f2007-06-13 17:12:26 -05001226 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1227 * @cmd: struct scsi_cmnd having problems
1228*/
1229static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230{
Brian King3d0e91f2007-06-13 17:12:26 -05001231 unsigned long wait_switch = 0;
FUJITA Tomonori7603e022007-07-23 09:28:40 +09001232 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233
Brian King3d0e91f2007-06-13 17:12:26 -05001234 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1235
1236 ibmvscsi_reset_host(hostdata);
1237
1238 for (wait_switch = jiffies + (init_timeout * HZ);
1239 time_before(jiffies, wait_switch) &&
1240 atomic_read(&hostdata->request_limit) < 2;) {
1241
1242 msleep(10);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 }
Brian King3d0e91f2007-06-13 17:12:26 -05001244
1245 if (atomic_read(&hostdata->request_limit) <= 0)
1246 return FAILED;
1247
1248 return SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249}
1250
1251/**
1252 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1253 * @crq: Command/Response queue
1254 * @hostdata: ibmvscsi_host_data of host
1255 *
1256*/
1257void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1258 struct ibmvscsi_host_data *hostdata)
1259{
Brian King6c0a60e2007-06-13 17:12:19 -05001260 long rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 unsigned long flags;
1262 struct srp_event_struct *evt_struct =
1263 (struct srp_event_struct *)crq->IU_data_ptr;
1264 switch (crq->valid) {
1265 case 0xC0: /* initialization */
1266 switch (crq->format) {
1267 case 0x01: /* Initialization message */
Brian King6c0a60e2007-06-13 17:12:19 -05001268 dev_info(hostdata->dev, "partner initialized\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 /* Send back a response */
David Woodhoused3849d52007-09-22 08:29:36 +10001270 if ((rc = ibmvscsi_ops->send_crq(hostdata,
1271 0xC002000000000000LL, 0)) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 /* Now login */
1273 send_srp_login(hostdata);
1274 } else {
Brian King6c0a60e2007-06-13 17:12:19 -05001275 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 }
1277
1278 break;
1279 case 0x02: /* Initialization response */
Brian King6c0a60e2007-06-13 17:12:19 -05001280 dev_info(hostdata->dev, "partner initialization complete\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281
1282 /* Now login */
1283 send_srp_login(hostdata);
1284 break;
1285 default:
Brian King6c0a60e2007-06-13 17:12:19 -05001286 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 }
1288 return;
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001289 case 0xFF: /* Hypervisor telling us the connection is closed */
1290 scsi_block_requests(hostdata->host);
Dave C Boutchercefbda22006-06-12 21:22:51 -05001291 atomic_set(&hostdata->request_limit, 0);
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001292 if (crq->format == 0x06) {
1293 /* We need to re-setup the interpartition connection */
Brian King6c0a60e2007-06-13 17:12:19 -05001294 dev_info(hostdata->dev, "Re-enabling adapter!\n");
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001295 purge_requests(hostdata, DID_REQUEUE);
David Woodhoused3849d52007-09-22 08:29:36 +10001296 if ((ibmvscsi_ops->reenable_crq_queue(&hostdata->queue,
1297 hostdata)) ||
1298 (ibmvscsi_ops->send_crq(hostdata,
1299 0xC001000000000000LL, 0))) {
Dave C Boutchercefbda22006-06-12 21:22:51 -05001300 atomic_set(&hostdata->request_limit,
1301 -1);
Brian King6c0a60e2007-06-13 17:12:19 -05001302 dev_err(hostdata->dev, "error after enable\n");
Dave C Boutchercefbda22006-06-12 21:22:51 -05001303 }
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001304 } else {
Brian King6c0a60e2007-06-13 17:12:19 -05001305 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1306 crq->format);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001308 purge_requests(hostdata, DID_ERROR);
David Woodhoused3849d52007-09-22 08:29:36 +10001309 if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue,
1310 hostdata)) ||
1311 (ibmvscsi_ops->send_crq(hostdata,
1312 0xC001000000000000LL, 0))) {
Dave C Boutchercefbda22006-06-12 21:22:51 -05001313 atomic_set(&hostdata->request_limit,
1314 -1);
Brian King6c0a60e2007-06-13 17:12:19 -05001315 dev_err(hostdata->dev, "error after reset\n");
Dave C Boutchercefbda22006-06-12 21:22:51 -05001316 }
Dave C Boutcher2b541f82006-01-19 13:34:44 -06001317 }
1318 scsi_unblock_requests(hostdata->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 return;
1320 case 0x80: /* real payload */
1321 break;
1322 default:
Brian King6c0a60e2007-06-13 17:12:19 -05001323 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1324 crq->valid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 return;
1326 }
1327
1328 /* The only kind of payload CRQs we should get are responses to
1329 * things we send. Make sure this response is to something we
1330 * actually sent
1331 */
1332 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
Brian King6c0a60e2007-06-13 17:12:19 -05001333 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 (void *)crq->IU_data_ptr);
1335 return;
1336 }
1337
1338 if (atomic_read(&evt_struct->free)) {
Brian King6c0a60e2007-06-13 17:12:19 -05001339 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1340 (void *)crq->IU_data_ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 return;
1342 }
1343
1344 if (crq->format == VIOSRP_SRP_FORMAT)
FUJITA Tomonorief265672006-03-26 03:57:14 +09001345 atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 &hostdata->request_limit);
1347
Brian King3d0e91f2007-06-13 17:12:26 -05001348 del_timer(&evt_struct->timer);
1349
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 if (evt_struct->done)
1351 evt_struct->done(evt_struct);
1352 else
Brian King6c0a60e2007-06-13 17:12:19 -05001353 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354
1355 /*
1356 * Lock the host_lock before messing with these structures, since we
1357 * are running in a task context
1358 */
1359 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1360 list_del(&evt_struct->list);
1361 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1362 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1363}
1364
1365/**
1366 * ibmvscsi_get_host_config: Send the command to the server to get host
1367 * configuration data. The data is opaque to us.
1368 */
1369static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1370 unsigned char *buffer, int length)
1371{
1372 struct viosrp_host_config *host_config;
1373 struct srp_event_struct *evt_struct;
Brian King06f923c2007-06-13 17:12:33 -05001374 unsigned long flags;
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +09001375 dma_addr_t addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 int rc;
1377
1378 evt_struct = get_event_struct(&hostdata->pool);
1379 if (!evt_struct) {
Brian King6c0a60e2007-06-13 17:12:19 -05001380 dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 return -1;
1382 }
1383
1384 init_event_struct(evt_struct,
1385 sync_completion,
1386 VIOSRP_MAD_FORMAT,
FUJITA Tomonori33874a02007-05-22 13:50:51 +09001387 init_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388
1389 host_config = &evt_struct->iu.mad.host_config;
1390
1391 /* Set up a lun reset SRP command */
1392 memset(host_config, 0x00, sizeof(*host_config));
1393 host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1394 host_config->common.length = length;
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +09001395 host_config->buffer = addr = dma_map_single(hostdata->dev, buffer,
1396 length,
1397 DMA_BIDIRECTIONAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398
1399 if (dma_mapping_error(host_config->buffer)) {
Brian King6c0a60e2007-06-13 17:12:19 -05001400 dev_err(hostdata->dev, "dma_mapping error getting host config\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 free_event_struct(&hostdata->pool, evt_struct);
1402 return -1;
1403 }
1404
1405 init_completion(&evt_struct->comp);
Brian King06f923c2007-06-13 17:12:33 -05001406 spin_lock_irqsave(hostdata->host->host_lock, flags);
Brian King3d0e91f2007-06-13 17:12:26 -05001407 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2);
Brian King06f923c2007-06-13 17:12:33 -05001408 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +09001409 if (rc == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 wait_for_completion(&evt_struct->comp);
FUJITA Tomonorie5dbfa62006-04-14 13:52:18 +09001411 dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412
1413 return rc;
1414}
1415
Robert Jennings0979c842007-03-29 12:30:40 -05001416/**
1417 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1418 * @sdev: struct scsi_device device to configure
1419 *
1420 * Enable allow_restart for a device if it is a disk. Adjust the
1421 * queue_depth here also as is required by the documentation for
1422 * struct scsi_host_template.
1423 */
1424static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1425{
1426 struct Scsi_Host *shost = sdev->host;
1427 unsigned long lock_flags = 0;
1428
1429 spin_lock_irqsave(shost->host_lock, lock_flags);
Brian Kingd1a357f2007-10-25 16:06:34 -05001430 if (sdev->type == TYPE_DISK) {
Robert Jennings0979c842007-03-29 12:30:40 -05001431 sdev->allow_restart = 1;
Brian Kingd1a357f2007-10-25 16:06:34 -05001432 sdev->timeout = 60 * HZ;
1433 }
Robert Jennings0979c842007-03-29 12:30:40 -05001434 scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun);
1435 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1436 return 0;
1437}
1438
Brian King742d25b2007-05-29 15:46:14 -05001439/**
1440 * ibmvscsi_change_queue_depth - Change the device's queue depth
1441 * @sdev: scsi device struct
1442 * @qdepth: depth to set
1443 *
1444 * Return value:
1445 * actual depth set
1446 **/
1447static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1448{
1449 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1450 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1451
1452 scsi_adjust_queue_depth(sdev, 0, qdepth);
1453 return sdev->queue_depth;
1454}
1455
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456/* ------------------------------------------------------------
1457 * sysfs attributes
1458 */
1459static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf)
1460{
1461 struct Scsi_Host *shost = class_to_shost(class_dev);
FUJITA Tomonori7603e022007-07-23 09:28:40 +09001462 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 int len;
1464
1465 len = snprintf(buf, PAGE_SIZE, "%s\n",
1466 hostdata->madapter_info.srp_version);
1467 return len;
1468}
1469
1470static struct class_device_attribute ibmvscsi_host_srp_version = {
1471 .attr = {
1472 .name = "srp_version",
1473 .mode = S_IRUGO,
1474 },
1475 .show = show_host_srp_version,
1476};
1477
1478static ssize_t show_host_partition_name(struct class_device *class_dev,
1479 char *buf)
1480{
1481 struct Scsi_Host *shost = class_to_shost(class_dev);
FUJITA Tomonori7603e022007-07-23 09:28:40 +09001482 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 int len;
1484
1485 len = snprintf(buf, PAGE_SIZE, "%s\n",
1486 hostdata->madapter_info.partition_name);
1487 return len;
1488}
1489
1490static struct class_device_attribute ibmvscsi_host_partition_name = {
1491 .attr = {
1492 .name = "partition_name",
1493 .mode = S_IRUGO,
1494 },
1495 .show = show_host_partition_name,
1496};
1497
1498static ssize_t show_host_partition_number(struct class_device *class_dev,
1499 char *buf)
1500{
1501 struct Scsi_Host *shost = class_to_shost(class_dev);
FUJITA Tomonori7603e022007-07-23 09:28:40 +09001502 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 int len;
1504
1505 len = snprintf(buf, PAGE_SIZE, "%d\n",
1506 hostdata->madapter_info.partition_number);
1507 return len;
1508}
1509
1510static struct class_device_attribute ibmvscsi_host_partition_number = {
1511 .attr = {
1512 .name = "partition_number",
1513 .mode = S_IRUGO,
1514 },
1515 .show = show_host_partition_number,
1516};
1517
1518static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf)
1519{
1520 struct Scsi_Host *shost = class_to_shost(class_dev);
FUJITA Tomonori7603e022007-07-23 09:28:40 +09001521 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 int len;
1523
1524 len = snprintf(buf, PAGE_SIZE, "%d\n",
1525 hostdata->madapter_info.mad_version);
1526 return len;
1527}
1528
1529static struct class_device_attribute ibmvscsi_host_mad_version = {
1530 .attr = {
1531 .name = "mad_version",
1532 .mode = S_IRUGO,
1533 },
1534 .show = show_host_mad_version,
1535};
1536
1537static ssize_t show_host_os_type(struct class_device *class_dev, char *buf)
1538{
1539 struct Scsi_Host *shost = class_to_shost(class_dev);
FUJITA Tomonori7603e022007-07-23 09:28:40 +09001540 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 int len;
1542
1543 len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
1544 return len;
1545}
1546
1547static struct class_device_attribute ibmvscsi_host_os_type = {
1548 .attr = {
1549 .name = "os_type",
1550 .mode = S_IRUGO,
1551 },
1552 .show = show_host_os_type,
1553};
1554
1555static ssize_t show_host_config(struct class_device *class_dev, char *buf)
1556{
1557 struct Scsi_Host *shost = class_to_shost(class_dev);
FUJITA Tomonori7603e022007-07-23 09:28:40 +09001558 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559
1560 /* returns null-terminated host config data */
1561 if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
1562 return strlen(buf);
1563 else
1564 return 0;
1565}
1566
1567static struct class_device_attribute ibmvscsi_host_config = {
1568 .attr = {
1569 .name = "config",
1570 .mode = S_IRUGO,
1571 },
1572 .show = show_host_config,
1573};
1574
1575static struct class_device_attribute *ibmvscsi_attrs[] = {
1576 &ibmvscsi_host_srp_version,
1577 &ibmvscsi_host_partition_name,
1578 &ibmvscsi_host_partition_number,
1579 &ibmvscsi_host_mad_version,
1580 &ibmvscsi_host_os_type,
1581 &ibmvscsi_host_config,
1582 NULL
1583};
1584
1585/* ------------------------------------------------------------
1586 * SCSI driver registration
1587 */
1588static struct scsi_host_template driver_template = {
1589 .module = THIS_MODULE,
1590 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
1591 .proc_name = "ibmvscsi",
1592 .queuecommand = ibmvscsi_queuecommand,
1593 .eh_abort_handler = ibmvscsi_eh_abort_handler,
1594 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
Brian King3d0e91f2007-06-13 17:12:26 -05001595 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
Robert Jennings0979c842007-03-29 12:30:40 -05001596 .slave_configure = ibmvscsi_slave_configure,
Brian King742d25b2007-05-29 15:46:14 -05001597 .change_queue_depth = ibmvscsi_change_queue_depth,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 .cmd_per_lun = 16,
Robert Jenningsa897ff22007-03-28 12:45:46 -05001599 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 .this_id = -1,
James Bottomley4dddbc22005-09-06 17:11:54 -05001601 .sg_tablesize = SG_ALL,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 .use_clustering = ENABLE_CLUSTERING,
1603 .shost_attrs = ibmvscsi_attrs,
1604};
1605
1606/**
1607 * Called by bus code for each adapter
1608 */
1609static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1610{
1611 struct ibmvscsi_host_data *hostdata;
1612 struct Scsi_Host *host;
1613 struct device *dev = &vdev->dev;
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001614 struct srp_rport_identifiers ids;
1615 struct srp_rport *rport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 unsigned long wait_switch = 0;
Dave C Boutchercefbda22006-06-12 21:22:51 -05001617 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618
1619 vdev->dev.driver_data = NULL;
1620
Robert Jenningsa897ff22007-03-28 12:45:46 -05001621 driver_template.can_queue = max_requests;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
1623 if (!host) {
Brian King6c0a60e2007-06-13 17:12:19 -05001624 dev_err(&vdev->dev, "couldn't allocate host data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625 goto scsi_host_alloc_failed;
1626 }
1627
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001628 host->transportt = ibmvscsi_transport_template;
FUJITA Tomonori7603e022007-07-23 09:28:40 +09001629 hostdata = shost_priv(host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 memset(hostdata, 0x00, sizeof(*hostdata));
1631 INIT_LIST_HEAD(&hostdata->sent);
1632 hostdata->host = host;
1633 hostdata->dev = dev;
1634 atomic_set(&hostdata->request_limit, -1);
1635 hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
1636
David Woodhoused3849d52007-09-22 08:29:36 +10001637 rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_requests);
Dave C Boutchercefbda22006-06-12 21:22:51 -05001638 if (rc != 0 && rc != H_RESOURCE) {
Brian King6c0a60e2007-06-13 17:12:19 -05001639 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 goto init_crq_failed;
1641 }
1642 if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) {
Brian King6c0a60e2007-06-13 17:12:19 -05001643 dev_err(&vdev->dev, "couldn't initialize event pool\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644 goto init_pool_failed;
1645 }
1646
1647 host->max_lun = 8;
1648 host->max_id = max_id;
1649 host->max_channel = max_channel;
1650
1651 if (scsi_add_host(hostdata->host, hostdata->dev))
1652 goto add_host_failed;
1653
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001654 /* we don't have a proper target_port_id so let's use the fake one */
1655 memcpy(ids.port_id, hostdata->madapter_info.partition_name,
1656 sizeof(ids.port_id));
FUJITA Tomonoriaebd5e42007-07-11 15:08:15 +09001657 ids.roles = SRP_RPORT_ROLE_TARGET;
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001658 rport = srp_rport_add(host, &ids);
1659 if (IS_ERR(rport))
1660 goto add_srp_port_failed;
1661
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 /* Try to send an initialization message. Note that this is allowed
1663 * to fail if the other end is not acive. In that case we don't
1664 * want to scan
1665 */
David Woodhoused3849d52007-09-22 08:29:36 +10001666 if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0
Dave C Boutchercefbda22006-06-12 21:22:51 -05001667 || rc == H_RESOURCE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 /*
1669 * Wait around max init_timeout secs for the adapter to finish
1670 * initializing. When we are done initializing, we will have a
1671 * valid request_limit. We don't want Linux scanning before
1672 * we are ready.
1673 */
1674 for (wait_switch = jiffies + (init_timeout * HZ);
1675 time_before(jiffies, wait_switch) &&
1676 atomic_read(&hostdata->request_limit) < 2;) {
1677
1678 msleep(10);
1679 }
1680
1681 /* if we now have a valid request_limit, initiate a scan */
1682 if (atomic_read(&hostdata->request_limit) > 0)
1683 scsi_scan_host(host);
1684 }
1685
1686 vdev->dev.driver_data = hostdata;
1687 return 0;
1688
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001689 add_srp_port_failed:
1690 scsi_remove_host(hostdata->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 add_host_failed:
1692 release_event_pool(&hostdata->pool, hostdata);
1693 init_pool_failed:
David Woodhoused3849d52007-09-22 08:29:36 +10001694 ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_requests);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 init_crq_failed:
1696 scsi_host_put(host);
1697 scsi_host_alloc_failed:
1698 return -1;
1699}
1700
1701static int ibmvscsi_remove(struct vio_dev *vdev)
1702{
1703 struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data;
1704 release_event_pool(&hostdata->pool, hostdata);
David Woodhoused3849d52007-09-22 08:29:36 +10001705 ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata,
1706 max_requests);
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001707
1708 srp_remove_host(hostdata->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 scsi_remove_host(hostdata->host);
1710 scsi_host_put(hostdata->host);
1711
1712 return 0;
1713}
1714
1715/**
1716 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1717 * support.
1718 */
1719static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
1720 {"vscsi", "IBM,v-scsi"},
Stephen Rothwellfb120da2005-08-17 16:42:59 +10001721 { "", "" }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
Stephen Rothwell915124d2005-10-24 15:12:22 +10001724
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725static struct vio_driver ibmvscsi_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 .id_table = ibmvscsi_device_table,
1727 .probe = ibmvscsi_probe,
Stephen Rothwell6fdf5392005-10-24 14:53:21 +10001728 .remove = ibmvscsi_remove,
1729 .driver = {
1730 .name = "ibmvscsi",
Stephen Rothwell915124d2005-10-24 15:12:22 +10001731 .owner = THIS_MODULE,
Stephen Rothwell6fdf5392005-10-24 14:53:21 +10001732 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733};
1734
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001735static struct srp_function_template ibmvscsi_transport_functions = {
1736};
1737
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738int __init ibmvscsi_module_init(void)
1739{
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001740 int ret;
1741
David Woodhoused3849d52007-09-22 08:29:36 +10001742 if (firmware_has_feature(FW_FEATURE_ISERIES))
1743 ibmvscsi_ops = &iseriesvscsi_ops;
1744 else if (firmware_has_feature(FW_FEATURE_VIO))
1745 ibmvscsi_ops = &rpavscsi_ops;
1746 else
1747 return -ENODEV;
1748
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001749 ibmvscsi_transport_template =
1750 srp_attach_transport(&ibmvscsi_transport_functions);
1751 if (!ibmvscsi_transport_template)
1752 return -ENOMEM;
1753
1754 ret = vio_register_driver(&ibmvscsi_driver);
1755 if (ret)
1756 srp_release_transport(ibmvscsi_transport_template);
1757 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758}
1759
1760void __exit ibmvscsi_module_exit(void)
1761{
1762 vio_unregister_driver(&ibmvscsi_driver);
FUJITA Tomonori4d680412007-06-27 16:32:50 +09001763 srp_release_transport(ibmvscsi_transport_template);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764}
1765
1766module_init(ibmvscsi_module_init);
1767module_exit(ibmvscsi_module_exit);