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1da177e4 LT |
1 | /* ------------------------------------------------------------ |
2 | * ibmvscsi.c | |
3 | * (C) Copyright IBM Corporation 1994, 2004 | |
4 | * Authors: Colin DeVilbiss (devilbis@us.ibm.com) | |
5 | * Santiago Leon (santil@us.ibm.com) | |
6 | * Dave Boutcher (sleddog@us.ibm.com) | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
21 | * USA | |
22 | * | |
23 | * ------------------------------------------------------------ | |
24 | * Emulation of a SCSI host adapter for Virtual I/O devices | |
25 | * | |
26 | * This driver supports the SCSI adapter implemented by the IBM | |
27 | * Power5 firmware. That SCSI adapter is not a physical adapter, | |
28 | * but allows Linux SCSI peripheral drivers to directly | |
29 | * access devices in another logical partition on the physical system. | |
30 | * | |
31 | * The virtual adapter(s) are present in the open firmware device | |
32 | * tree just like real adapters. | |
33 | * | |
34 | * One of the capabilities provided on these systems is the ability | |
35 | * to DMA between partitions. The architecture states that for VSCSI, | |
36 | * the server side is allowed to DMA to and from the client. The client | |
37 | * is never trusted to DMA to or from the server directly. | |
38 | * | |
39 | * Messages are sent between partitions on a "Command/Response Queue" | |
40 | * (CRQ), which is just a buffer of 16 byte entries in the receiver's | |
41 | * Senders cannot access the buffer directly, but send messages by | |
42 | * making a hypervisor call and passing in the 16 bytes. The hypervisor | |
9b7dac08 | 43 | * puts the message in the next 16 byte space in round-robin fashion, |
1da177e4 LT |
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> | |
5a0e3ad6 | 73 | #include <linux/slab.h> |
126c5cc3 | 74 | #include <linux/of.h> |
64355b92 | 75 | #include <linux/pm.h> |
0f33ece5 | 76 | #include <linux/kthread.h> |
d3849d51 | 77 | #include <asm/firmware.h> |
1da177e4 LT |
78 | #include <asm/vio.h> |
79 | #include <scsi/scsi.h> | |
80 | #include <scsi/scsi_cmnd.h> | |
81 | #include <scsi/scsi_host.h> | |
82 | #include <scsi/scsi_device.h> | |
4d680419 | 83 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
84 | #include "ibmvscsi.h" |
85 | ||
86 | /* The values below are somewhat arbitrary default values, but | |
87 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
88 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
89 | * 5 bits of LUN. | |
90 | */ | |
91 | static int max_id = 64; | |
92 | static int max_channel = 3; | |
e1a5ce5b RJ |
93 | static int init_timeout = 300; |
94 | static int login_timeout = 60; | |
95 | static int info_timeout = 30; | |
96 | static int abort_timeout = 60; | |
97 | static int reset_timeout = 60; | |
a897ff2a | 98 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
4f10aae0 | 99 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
c1988e31 | 100 | static int fast_fail = 1; |
126c5cc3 | 101 | static int client_reserve = 1; |
1da177e4 | 102 | |
4d680419 FT |
103 | static struct scsi_transport_template *ibmvscsi_transport_template; |
104 | ||
2b541f8f | 105 | #define IBMVSCSI_VERSION "1.5.8" |
1da177e4 | 106 | |
d3849d51 DW |
107 | static struct ibmvscsi_ops *ibmvscsi_ops; |
108 | ||
1da177e4 LT |
109 | MODULE_DESCRIPTION("IBM Virtual SCSI"); |
110 | MODULE_AUTHOR("Dave Boutcher"); | |
111 | MODULE_LICENSE("GPL"); | |
112 | MODULE_VERSION(IBMVSCSI_VERSION); | |
113 | ||
114 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
115 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); | |
116 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); | |
117 | MODULE_PARM_DESC(max_channel, "Largest channel value"); | |
118 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); | |
119 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
21465eda | 120 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
1da177e4 | 121 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
c1988e31 RJ |
122 | module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); |
123 | MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); | |
126c5cc3 BK |
124 | module_param_named(client_reserve, client_reserve, int, S_IRUGO ); |
125 | MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); | |
1da177e4 LT |
126 | |
127 | /* ------------------------------------------------------------ | |
128 | * Routines for the event pool and event structs | |
129 | */ | |
130 | /** | |
131 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
132 | * @pool: event_pool to be initialized | |
133 | * @size: Number of events in pool | |
134 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
135 | * | |
136 | * Returns zero on success. | |
137 | */ | |
138 | static int initialize_event_pool(struct event_pool *pool, | |
139 | int size, struct ibmvscsi_host_data *hostdata) | |
140 | { | |
141 | int i; | |
142 | ||
143 | pool->size = size; | |
144 | pool->next = 0; | |
4c021dd1 | 145 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
146 | if (!pool->events) |
147 | return -ENOMEM; | |
1da177e4 LT |
148 | |
149 | pool->iu_storage = | |
150 | dma_alloc_coherent(hostdata->dev, | |
151 | pool->size * sizeof(*pool->iu_storage), | |
152 | &pool->iu_token, 0); | |
153 | if (!pool->iu_storage) { | |
154 | kfree(pool->events); | |
155 | return -ENOMEM; | |
156 | } | |
157 | ||
158 | for (i = 0; i < pool->size; ++i) { | |
159 | struct srp_event_struct *evt = &pool->events[i]; | |
160 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
161 | atomic_set(&evt->free, 1); | |
162 | evt->crq.valid = 0x80; | |
163 | evt->crq.IU_length = sizeof(*evt->xfer_iu); | |
164 | evt->crq.IU_data_ptr = pool->iu_token + | |
165 | sizeof(*evt->xfer_iu) * i; | |
166 | evt->xfer_iu = pool->iu_storage + i; | |
167 | evt->hostdata = hostdata; | |
4dddbc26 JB |
168 | evt->ext_list = NULL; |
169 | evt->ext_list_token = 0; | |
1da177e4 LT |
170 | } |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | /** | |
176 | * release_event_pool: - Frees memory of an event pool of a host | |
177 | * @pool: event_pool to be released | |
178 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
179 | * | |
180 | * Returns zero on success. | |
181 | */ | |
182 | static void release_event_pool(struct event_pool *pool, | |
183 | struct ibmvscsi_host_data *hostdata) | |
184 | { | |
185 | int i, in_use = 0; | |
4dddbc26 | 186 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
187 | if (atomic_read(&pool->events[i].free) != 1) |
188 | ++in_use; | |
4dddbc26 JB |
189 | if (pool->events[i].ext_list) { |
190 | dma_free_coherent(hostdata->dev, | |
ef265673 | 191 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
192 | pool->events[i].ext_list, |
193 | pool->events[i].ext_list_token); | |
194 | } | |
195 | } | |
1da177e4 | 196 | if (in_use) |
6c0a60ec BK |
197 | dev_warn(hostdata->dev, "releasing event pool with %d " |
198 | "events still in use?\n", in_use); | |
1da177e4 LT |
199 | kfree(pool->events); |
200 | dma_free_coherent(hostdata->dev, | |
201 | pool->size * sizeof(*pool->iu_storage), | |
202 | pool->iu_storage, pool->iu_token); | |
203 | } | |
204 | ||
205 | /** | |
206 | * valid_event_struct: - Determines if event is valid. | |
207 | * @pool: event_pool that contains the event | |
208 | * @evt: srp_event_struct to be checked for validity | |
209 | * | |
210 | * Returns zero if event is invalid, one otherwise. | |
211 | */ | |
212 | static int valid_event_struct(struct event_pool *pool, | |
213 | struct srp_event_struct *evt) | |
214 | { | |
215 | int index = evt - pool->events; | |
216 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
217 | return 0; | |
218 | if (evt != pool->events + index) /* unaligned */ | |
219 | return 0; | |
220 | return 1; | |
221 | } | |
222 | ||
223 | /** | |
224 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
225 | * @pool: event_pool that contains the event | |
226 | * @evt: srp_event_struct to be modified | |
227 | * | |
228 | */ | |
229 | static void free_event_struct(struct event_pool *pool, | |
230 | struct srp_event_struct *evt) | |
231 | { | |
232 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
233 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
234 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
235 | return; |
236 | } | |
237 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
238 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
239 | "which is not in use!\n", evt); | |
1da177e4 LT |
240 | return; |
241 | } | |
242 | } | |
243 | ||
244 | /** | |
245 | * get_evt_struct: - Gets the next free event in pool | |
246 | * @pool: event_pool that contains the events to be searched | |
247 | * | |
248 | * Returns the next event in "free" state, and NULL if none are free. | |
249 | * Note that no synchronization is done here, we assume the host_lock | |
250 | * will syncrhonze things. | |
251 | */ | |
252 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
253 | { | |
254 | int i; | |
255 | int poolsize = pool->size; | |
256 | int offset = pool->next; | |
257 | ||
258 | for (i = 0; i < poolsize; i++) { | |
259 | offset = (offset + 1) % poolsize; | |
260 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
261 | pool->next = offset; | |
262 | return &pool->events[offset]; | |
263 | } | |
264 | } | |
265 | ||
266 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
267 | return NULL; | |
268 | } | |
269 | ||
270 | /** | |
271 | * init_event_struct: Initialize fields in an event struct that are always | |
272 | * required. | |
273 | * @evt: The event | |
274 | * @done: Routine to call when the event is responded to | |
275 | * @format: SRP or MAD format | |
276 | * @timeout: timeout value set in the CRQ | |
277 | */ | |
278 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
279 | void (*done) (struct srp_event_struct *), | |
280 | u8 format, | |
281 | int timeout) | |
282 | { | |
283 | evt_struct->cmnd = NULL; | |
284 | evt_struct->cmnd_done = NULL; | |
285 | evt_struct->sync_srp = NULL; | |
286 | evt_struct->crq.format = format; | |
287 | evt_struct->crq.timeout = timeout; | |
288 | evt_struct->done = done; | |
289 | } | |
290 | ||
291 | /* ------------------------------------------------------------ | |
292 | * Routines for receiving SCSI responses from the hosting partition | |
293 | */ | |
294 | ||
295 | /** | |
296 | * set_srp_direction: Set the fields in the srp related to data | |
297 | * direction and number of buffers based on the direction in | |
298 | * the scsi_cmnd and the number of buffers | |
299 | */ | |
300 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
301 | struct srp_cmd *srp_cmd, | |
302 | int numbuf) | |
303 | { | |
ef265673 FT |
304 | u8 fmt; |
305 | ||
1da177e4 LT |
306 | if (numbuf == 0) |
307 | return; | |
308 | ||
ef265673 FT |
309 | if (numbuf == 1) |
310 | fmt = SRP_DATA_DESC_DIRECT; | |
311 | else { | |
312 | fmt = SRP_DATA_DESC_INDIRECT; | |
313 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
314 | ||
1da177e4 | 315 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
316 | srp_cmd->data_out_desc_cnt = numbuf; |
317 | else | |
318 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 319 | } |
ef265673 FT |
320 | |
321 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
322 | srp_cmd->buf_fmt = fmt << 4; | |
323 | else | |
324 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
325 | } |
326 | ||
327 | /** | |
328 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
329 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
330 | * @dev: device for which the memory is mapped | |
331 | * | |
332 | */ | |
4dddbc26 JB |
333 | static void unmap_cmd_data(struct srp_cmd *cmd, |
334 | struct srp_event_struct *evt_struct, | |
335 | struct device *dev) | |
1da177e4 | 336 | { |
ef265673 FT |
337 | u8 out_fmt, in_fmt; |
338 | ||
339 | out_fmt = cmd->buf_fmt >> 4; | |
340 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
341 | ||
342 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 343 | return; |
4dddbc26 | 344 | |
a71fa1fc FT |
345 | if (evt_struct->cmnd) |
346 | scsi_dma_unmap(evt_struct->cmnd); | |
1da177e4 LT |
347 | } |
348 | ||
9413d7b8 | 349 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 350 | struct srp_direct_buf *md) |
4dddbc26 JB |
351 | { |
352 | int i; | |
9413d7b8 | 353 | struct scatterlist *sg; |
4dddbc26 JB |
354 | u64 total_length = 0; |
355 | ||
9413d7b8 | 356 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 357 | struct srp_direct_buf *descr = md + i; |
9413d7b8 FT |
358 | descr->va = sg_dma_address(sg); |
359 | descr->len = sg_dma_len(sg); | |
ef265673 | 360 | descr->key = 0; |
9413d7b8 | 361 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
362 | } |
363 | return total_length; | |
364 | } | |
365 | ||
1da177e4 LT |
366 | /** |
367 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
368 | * @cmd: Scsi_Cmnd with the scatterlist | |
369 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
370 | * @dev: device for which to map dma memory | |
371 | * | |
372 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
373 | * Returns 1 on success. | |
374 | */ | |
375 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 376 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
377 | struct srp_cmd *srp_cmd, struct device *dev) |
378 | { | |
379 | ||
4dddbc26 | 380 | int sg_mapped; |
1da177e4 | 381 | u64 total_length = 0; |
ef265673 FT |
382 | struct srp_direct_buf *data = |
383 | (struct srp_direct_buf *) srp_cmd->add_data; | |
384 | struct srp_indirect_buf *indirect = | |
385 | (struct srp_indirect_buf *) data; | |
1da177e4 | 386 | |
9413d7b8 FT |
387 | sg_mapped = scsi_dma_map(cmd); |
388 | if (!sg_mapped) | |
389 | return 1; | |
390 | else if (sg_mapped < 0) | |
1da177e4 LT |
391 | return 0; |
392 | ||
393 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
394 | ||
395 | /* special case; we can use a single direct descriptor */ | |
396 | if (sg_mapped == 1) { | |
9413d7b8 | 397 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
398 | return 1; |
399 | } | |
400 | ||
ef265673 FT |
401 | indirect->table_desc.va = 0; |
402 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); | |
403 | indirect->table_desc.key = 0; | |
4dddbc26 JB |
404 | |
405 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 406 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 FT |
407 | &indirect->desc_list[0]); |
408 | indirect->len = total_length; | |
4dddbc26 | 409 | return 1; |
1da177e4 | 410 | } |
1da177e4 | 411 | |
4dddbc26 JB |
412 | /* get indirect table */ |
413 | if (!evt_struct->ext_list) { | |
ef265673 | 414 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 415 | dma_alloc_coherent(dev, |
ef265673 FT |
416 | SG_ALL * sizeof(struct srp_direct_buf), |
417 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 418 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
419 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
420 | sdev_printk(KERN_ERR, cmd->device, | |
421 | "Can't allocate memory " | |
422 | "for indirect table\n"); | |
e637d553 | 423 | scsi_dma_unmap(cmd); |
4dddbc26 | 424 | return 0; |
4dddbc26 JB |
425 | } |
426 | } | |
427 | ||
9413d7b8 | 428 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 429 | |
ef265673 FT |
430 | indirect->len = total_length; |
431 | indirect->table_desc.va = evt_struct->ext_list_token; | |
432 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); | |
433 | memcpy(indirect->desc_list, evt_struct->ext_list, | |
434 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 435 | return 1; |
1da177e4 LT |
436 | } |
437 | ||
1da177e4 LT |
438 | /** |
439 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
440 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
441 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
442 | * @dev: dma device for which to map dma memory | |
443 | * | |
444 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
445 | * Returns 1 on success. | |
446 | */ | |
447 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 448 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
449 | struct srp_cmd *srp_cmd, struct device *dev) |
450 | { | |
451 | switch (cmd->sc_data_direction) { | |
452 | case DMA_FROM_DEVICE: | |
453 | case DMA_TO_DEVICE: | |
454 | break; | |
455 | case DMA_NONE: | |
456 | return 1; | |
457 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
458 | sdev_printk(KERN_ERR, cmd->device, |
459 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
460 | return 0; |
461 | default: | |
6c0a60ec BK |
462 | sdev_printk(KERN_ERR, cmd->device, |
463 | "Unknown data direction 0x%02x; can't map!\n", | |
464 | cmd->sc_data_direction); | |
1da177e4 LT |
465 | return 0; |
466 | } | |
467 | ||
9413d7b8 | 468 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
469 | } |
470 | ||
3d0e91f7 BK |
471 | /** |
472 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
473 | * @hostdata: the adapter | |
474 | */ | |
475 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
476 | { | |
1117ef8a | 477 | struct srp_event_struct *evt; |
3d0e91f7 BK |
478 | unsigned long flags; |
479 | ||
480 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1117ef8a BK |
481 | while (!list_empty(&hostdata->sent)) { |
482 | evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); | |
483 | list_del(&evt->list); | |
484 | del_timer(&evt->timer); | |
485 | ||
486 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
487 | if (evt->cmnd) { | |
488 | evt->cmnd->result = (error_code << 16); | |
489 | unmap_cmd_data(&evt->iu.srp.cmd, evt, | |
490 | evt->hostdata->dev); | |
491 | if (evt->cmnd_done) | |
492 | evt->cmnd_done(evt->cmnd); | |
493 | } else if (evt->done) | |
494 | evt->done(evt); | |
495 | free_event_struct(&evt->hostdata->pool, evt); | |
496 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
3d0e91f7 BK |
497 | } |
498 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
499 | } | |
500 | ||
501 | /** | |
502 | * ibmvscsi_reset_host - Reset the connection to the server | |
503 | * @hostdata: struct ibmvscsi_host_data to reset | |
504 | */ | |
505 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
506 | { | |
507 | scsi_block_requests(hostdata->host); | |
508 | atomic_set(&hostdata->request_limit, 0); | |
509 | ||
510 | purge_requests(hostdata, DID_ERROR); | |
0f33ece5 BK |
511 | hostdata->reset_crq = 1; |
512 | wake_up(&hostdata->work_wait_q); | |
3d0e91f7 BK |
513 | } |
514 | ||
515 | /** | |
516 | * ibmvscsi_timeout - Internal command timeout handler | |
517 | * @evt_struct: struct srp_event_struct that timed out | |
518 | * | |
519 | * Called when an internally generated command times out | |
520 | */ | |
521 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) | |
522 | { | |
523 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
524 | ||
525 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
526 | evt_struct->iu.srp.cmd.opcode); | |
527 | ||
528 | ibmvscsi_reset_host(hostdata); | |
529 | } | |
530 | ||
531 | ||
1da177e4 LT |
532 | /* ------------------------------------------------------------ |
533 | * Routines for sending and receiving SRPs | |
534 | */ | |
535 | /** | |
536 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
537 | * @evt_struct: evt_struct to be sent | |
538 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 539 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
540 | * |
541 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
542 | * Note that this routine assumes that host_lock is held for synchronization | |
543 | */ | |
544 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
545 | struct ibmvscsi_host_data *hostdata, |
546 | unsigned long timeout) | |
1da177e4 | 547 | { |
1da177e4 | 548 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
3c887e8a | 549 | int request_status = 0; |
1da177e4 | 550 | int rc; |
f3a9c4d7 | 551 | int srp_req = 0; |
1da177e4 | 552 | |
a897ff2a RJ |
553 | /* If we have exhausted our request limit, just fail this request, |
554 | * unless it is for a reset or abort. | |
1da177e4 LT |
555 | * Note that there are rare cases involving driver generated requests |
556 | * (such as task management requests) that the mid layer may think we | |
557 | * can handle more requests (can_queue) when we actually can't | |
558 | */ | |
cefbda2d | 559 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
f3a9c4d7 | 560 | srp_req = 1; |
cefbda2d DB |
561 | request_status = |
562 | atomic_dec_if_positive(&hostdata->request_limit); | |
563 | /* If request limit was -1 when we started, it is now even | |
564 | * less than that | |
565 | */ | |
566 | if (request_status < -1) | |
567 | goto send_error; | |
a897ff2a | 568 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
569 | /* If request limit was 0 when we started the adapter is in the |
570 | * process of performing a login with the server adapter, or | |
571 | * we may have run out of requests. | |
572 | */ | |
573 | else if (request_status == -1 && | |
574 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
575 | goto send_busy; | |
a897ff2a RJ |
576 | /* Abort and reset calls should make it through. |
577 | * Nothing except abort and reset should use the last two | |
578 | * slots unless we had two or less to begin with. | |
579 | */ | |
580 | else if (request_status < 2 && | |
581 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
582 | /* In the case that we have less than two requests | |
583 | * available, check the server limit as a combination | |
584 | * of the request limit and the number of requests | |
585 | * in-flight (the size of the send list). If the | |
586 | * server limit is greater than 2, return busy so | |
587 | * that the last two are reserved for reset and abort. | |
588 | */ | |
589 | int server_limit = request_status; | |
590 | struct srp_event_struct *tmp_evt; | |
591 | ||
592 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
593 | server_limit++; | |
594 | } | |
595 | ||
596 | if (server_limit > 2) | |
597 | goto send_busy; | |
598 | } | |
cefbda2d | 599 | } |
1da177e4 LT |
600 | |
601 | /* Copy the IU into the transfer area */ | |
602 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 603 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
604 | |
605 | /* Add this to the sent list. We need to do this | |
606 | * before we actually send | |
607 | * in case it comes back REALLY fast | |
608 | */ | |
609 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
610 | ||
3d0e91f7 BK |
611 | init_timer(&evt_struct->timer); |
612 | if (timeout) { | |
613 | evt_struct->timer.data = (unsigned long) evt_struct; | |
614 | evt_struct->timer.expires = jiffies + (timeout * HZ); | |
615 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; | |
616 | add_timer(&evt_struct->timer); | |
617 | } | |
618 | ||
1da177e4 | 619 | if ((rc = |
d3849d51 | 620 | ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
1da177e4 | 621 | list_del(&evt_struct->list); |
3d0e91f7 | 622 | del_timer(&evt_struct->timer); |
1da177e4 | 623 | |
860784c8 RJ |
624 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
625 | * Firmware will send a CRQ with a transport event (0xFF) to | |
626 | * tell this client what has happened to the transport. This | |
627 | * will be handled in ibmvscsi_handle_crq() | |
628 | */ | |
629 | if (rc == H_CLOSED) { | |
630 | dev_warn(hostdata->dev, "send warning. " | |
631 | "Receive queue closed, will retry.\n"); | |
632 | goto send_busy; | |
633 | } | |
6c0a60ec | 634 | dev_err(hostdata->dev, "send error %d\n", rc); |
f3a9c4d7 BK |
635 | if (srp_req) |
636 | atomic_inc(&hostdata->request_limit); | |
1da177e4 LT |
637 | goto send_error; |
638 | } | |
639 | ||
640 | return 0; | |
641 | ||
cefbda2d | 642 | send_busy: |
4dddbc26 | 643 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 644 | |
1da177e4 | 645 | free_event_struct(&hostdata->pool, evt_struct); |
f3a9c4d7 | 646 | if (srp_req && request_status != -1) |
3c887e8a | 647 | atomic_inc(&hostdata->request_limit); |
a897ff2a | 648 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
649 | |
650 | send_error: | |
651 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
652 | ||
653 | if (evt_struct->cmnd != NULL) { | |
654 | evt_struct->cmnd->result = DID_ERROR << 16; | |
655 | evt_struct->cmnd_done(evt_struct->cmnd); | |
656 | } else if (evt_struct->done) | |
657 | evt_struct->done(evt_struct); | |
658 | ||
659 | free_event_struct(&hostdata->pool, evt_struct); | |
660 | return 0; | |
1da177e4 LT |
661 | } |
662 | ||
663 | /** | |
664 | * handle_cmd_rsp: - Handle responses from commands | |
665 | * @evt_struct: srp_event_struct to be handled | |
666 | * | |
667 | * Used as a callback by when sending scsi cmds. | |
668 | * Gets called by ibmvscsi_handle_crq() | |
669 | */ | |
670 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
671 | { | |
672 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
673 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
674 | ||
ef265673 | 675 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 676 | if (printk_ratelimit()) |
6c0a60ec BK |
677 | dev_warn(evt_struct->hostdata->dev, |
678 | "bad SRP RSP type %d\n", rsp->opcode); | |
1da177e4 LT |
679 | } |
680 | ||
681 | if (cmnd) { | |
c3a3b55a | 682 | cmnd->result |= rsp->status; |
1da177e4 LT |
683 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
684 | memcpy(cmnd->sense_buffer, | |
ef265673 FT |
685 | rsp->data, |
686 | rsp->sense_data_len); | |
1da177e4 | 687 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 688 | evt_struct, |
1da177e4 LT |
689 | evt_struct->hostdata->dev); |
690 | ||
ef265673 | 691 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
9413d7b8 | 692 | scsi_set_resid(cmnd, rsp->data_out_res_cnt); |
ef265673 | 693 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
9413d7b8 | 694 | scsi_set_resid(cmnd, rsp->data_in_res_cnt); |
1da177e4 LT |
695 | } |
696 | ||
697 | if (evt_struct->cmnd_done) | |
698 | evt_struct->cmnd_done(cmnd); | |
699 | } | |
700 | ||
701 | /** | |
702 | * lun_from_dev: - Returns the lun of the scsi device | |
703 | * @dev: struct scsi_device | |
704 | * | |
705 | */ | |
706 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
707 | { | |
708 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
709 | } | |
710 | ||
711 | /** | |
712 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
713 | * @cmd: struct scsi_cmnd to be executed | |
714 | * @done: Callback function to be called when cmd is completed | |
715 | */ | |
716 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, | |
717 | void (*done) (struct scsi_cmnd *)) | |
718 | { | |
719 | struct srp_cmd *srp_cmd; | |
720 | struct srp_event_struct *evt_struct; | |
ef265673 | 721 | struct srp_indirect_buf *indirect; |
7603e02e | 722 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 723 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 724 | u8 out_fmt, in_fmt; |
1da177e4 | 725 | |
c3a3b55a | 726 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
727 | evt_struct = get_event_struct(&hostdata->pool); |
728 | if (!evt_struct) | |
729 | return SCSI_MLQUEUE_HOST_BUSY; | |
730 | ||
1da177e4 LT |
731 | /* Set up the actual SRP IU */ |
732 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
733 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
734 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 735 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
1da177e4 LT |
736 | srp_cmd->lun = ((u64) lun) << 48; |
737 | ||
4dddbc26 | 738 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
739 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
740 | sdev_printk(KERN_ERR, cmnd->device, | |
741 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
742 | free_event_struct(&hostdata->pool, evt_struct); |
743 | return SCSI_MLQUEUE_HOST_BUSY; | |
744 | } | |
745 | ||
4dddbc26 JB |
746 | init_event_struct(evt_struct, |
747 | handle_cmd_rsp, | |
748 | VIOSRP_SRP_FORMAT, | |
242f9dcb | 749 | cmnd->request->timeout/HZ); |
4dddbc26 JB |
750 | |
751 | evt_struct->cmnd = cmnd; | |
752 | evt_struct->cmnd_done = done; | |
753 | ||
1da177e4 | 754 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
755 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
756 | out_fmt = srp_cmd->buf_fmt >> 4; | |
757 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
758 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
759 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
760 | indirect->table_desc.va == 0) { | |
761 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + | |
762 | offsetof(struct srp_cmd, add_data) + | |
763 | offsetof(struct srp_indirect_buf, desc_list); | |
1da177e4 LT |
764 | } |
765 | ||
3d0e91f7 | 766 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
767 | } |
768 | ||
769 | /* ------------------------------------------------------------ | |
770 | * Routines for driver initialization | |
771 | */ | |
3507e13f | 772 | |
126c5cc3 BK |
773 | /** |
774 | * map_persist_bufs: - Pre-map persistent data for adapter logins | |
775 | * @hostdata: ibmvscsi_host_data of host | |
776 | * | |
777 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. | |
778 | * Return 1 on error, 0 on success. | |
779 | */ | |
780 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
781 | { | |
782 | ||
783 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, | |
784 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
785 | ||
786 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { | |
787 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); | |
788 | return 1; | |
789 | } | |
790 | ||
791 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, | |
792 | &hostdata->madapter_info, | |
793 | sizeof(hostdata->madapter_info), | |
794 | DMA_BIDIRECTIONAL); | |
795 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { | |
796 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); | |
797 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
798 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
799 | return 1; | |
800 | } | |
801 | ||
802 | return 0; | |
803 | } | |
804 | ||
805 | /** | |
806 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins | |
807 | * @hostdata: ibmvscsi_host_data of host | |
808 | * | |
809 | * Unmap the capabilities and adapter info DMA buffers | |
810 | */ | |
811 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
812 | { | |
813 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
814 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
815 | ||
816 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, | |
817 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); | |
818 | } | |
819 | ||
3507e13f BK |
820 | /** |
821 | * login_rsp: - Handle response to SRP login request | |
822 | * @evt_struct: srp_event_struct with the response | |
823 | * | |
824 | * Used as a "done" callback by when sending srp_login. Gets called | |
825 | * by ibmvscsi_handle_crq() | |
826 | */ | |
827 | static void login_rsp(struct srp_event_struct *evt_struct) | |
828 | { | |
829 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
830 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { | |
831 | case SRP_LOGIN_RSP: /* it worked! */ | |
832 | break; | |
833 | case SRP_LOGIN_REJ: /* refused! */ | |
834 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", | |
835 | evt_struct->xfer_iu->srp.login_rej.reason); | |
836 | /* Login failed. */ | |
837 | atomic_set(&hostdata->request_limit, -1); | |
838 | return; | |
839 | default: | |
840 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", | |
841 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
842 | /* Login failed. */ | |
843 | atomic_set(&hostdata->request_limit, -1); | |
844 | return; | |
845 | } | |
846 | ||
847 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); | |
126c5cc3 | 848 | hostdata->client_migrated = 0; |
3507e13f BK |
849 | |
850 | /* Now we know what the real request-limit is. | |
851 | * This value is set rather than added to request_limit because | |
852 | * request_limit could have been set to -1 by this client. | |
853 | */ | |
854 | atomic_set(&hostdata->request_limit, | |
855 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); | |
856 | ||
857 | /* If we had any pending I/Os, kick them */ | |
858 | scsi_unblock_requests(hostdata->host); | |
859 | } | |
860 | ||
861 | /** | |
862 | * send_srp_login: - Sends the srp login | |
863 | * @hostdata: ibmvscsi_host_data of host | |
864 | * | |
865 | * Returns zero if successful. | |
866 | */ | |
867 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
868 | { | |
869 | int rc; | |
870 | unsigned long flags; | |
871 | struct srp_login_req *login; | |
872 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
873 | ||
874 | BUG_ON(!evt_struct); | |
875 | init_event_struct(evt_struct, login_rsp, | |
876 | VIOSRP_SRP_FORMAT, login_timeout); | |
877 | ||
878 | login = &evt_struct->iu.srp.login_req; | |
879 | memset(login, 0, sizeof(*login)); | |
880 | login->opcode = SRP_LOGIN_REQ; | |
881 | login->req_it_iu_len = sizeof(union srp_iu); | |
882 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; | |
883 | ||
884 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
885 | /* Start out with a request limit of 0, since this is negotiated in | |
886 | * the login request we are just sending and login requests always | |
887 | * get sent by the driver regardless of request_limit. | |
888 | */ | |
889 | atomic_set(&hostdata->request_limit, 0); | |
890 | ||
891 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); | |
892 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
893 | dev_info(hostdata->dev, "sent SRP login\n"); | |
894 | return rc; | |
895 | }; | |
896 | ||
126c5cc3 BK |
897 | /** |
898 | * capabilities_rsp: - Handle response to MAD adapter capabilities request | |
899 | * @evt_struct: srp_event_struct with the response | |
900 | * | |
901 | * Used as a "done" callback by when sending adapter_info. | |
902 | */ | |
903 | static void capabilities_rsp(struct srp_event_struct *evt_struct) | |
904 | { | |
905 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
906 | ||
907 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { | |
908 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", | |
909 | evt_struct->xfer_iu->mad.capabilities.common.status); | |
910 | } else { | |
911 | if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP) | |
912 | dev_info(hostdata->dev, "Partition migration not supported\n"); | |
913 | ||
914 | if (client_reserve) { | |
915 | if (hostdata->caps.reserve.common.server_support == | |
916 | SERVER_SUPPORTS_CAP) | |
917 | dev_info(hostdata->dev, "Client reserve enabled\n"); | |
918 | else | |
919 | dev_info(hostdata->dev, "Client reserve not supported\n"); | |
920 | } | |
921 | } | |
922 | ||
923 | send_srp_login(hostdata); | |
924 | } | |
925 | ||
926 | /** | |
927 | * send_mad_capabilities: - Sends the mad capabilities request | |
928 | * and stores the result so it can be retrieved with | |
929 | * @hostdata: ibmvscsi_host_data of host | |
930 | */ | |
931 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) | |
932 | { | |
933 | struct viosrp_capabilities *req; | |
934 | struct srp_event_struct *evt_struct; | |
935 | unsigned long flags; | |
61c7a080 | 936 | struct device_node *of_node = hostdata->dev->of_node; |
126c5cc3 BK |
937 | const char *location; |
938 | ||
939 | evt_struct = get_event_struct(&hostdata->pool); | |
940 | BUG_ON(!evt_struct); | |
941 | ||
942 | init_event_struct(evt_struct, capabilities_rsp, | |
943 | VIOSRP_MAD_FORMAT, info_timeout); | |
944 | ||
945 | req = &evt_struct->iu.mad.capabilities; | |
946 | memset(req, 0, sizeof(*req)); | |
947 | ||
948 | hostdata->caps.flags = CAP_LIST_SUPPORTED; | |
949 | if (hostdata->client_migrated) | |
950 | hostdata->caps.flags |= CLIENT_MIGRATED; | |
951 | ||
952 | strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), | |
953 | sizeof(hostdata->caps.name)); | |
954 | hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0'; | |
955 | ||
956 | location = of_get_property(of_node, "ibm,loc-code", NULL); | |
957 | location = location ? location : dev_name(hostdata->dev); | |
958 | strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); | |
959 | hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0'; | |
960 | ||
961 | req->common.type = VIOSRP_CAPABILITIES_TYPE; | |
962 | req->buffer = hostdata->caps_addr; | |
963 | ||
964 | hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES; | |
965 | hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration); | |
966 | hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP; | |
967 | hostdata->caps.migration.ecl = 1; | |
968 | ||
969 | if (client_reserve) { | |
970 | hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES; | |
971 | hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve); | |
972 | hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP; | |
973 | hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2; | |
974 | req->common.length = sizeof(hostdata->caps); | |
975 | } else | |
976 | req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve); | |
977 | ||
978 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
979 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) | |
980 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); | |
981 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
982 | }; | |
983 | ||
c1988e31 RJ |
984 | /** |
985 | * fast_fail_rsp: - Handle response to MAD enable fast fail | |
986 | * @evt_struct: srp_event_struct with the response | |
987 | * | |
988 | * Used as a "done" callback by when sending enable fast fail. Gets called | |
989 | * by ibmvscsi_handle_crq() | |
990 | */ | |
991 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) | |
992 | { | |
993 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
994 | u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status; | |
995 | ||
996 | if (status == VIOSRP_MAD_NOT_SUPPORTED) | |
997 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); | |
998 | else if (status == VIOSRP_MAD_FAILED) | |
999 | dev_err(hostdata->dev, "fast_fail request failed\n"); | |
1000 | else if (status != VIOSRP_MAD_SUCCESS) | |
1001 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); | |
1002 | ||
126c5cc3 | 1003 | send_mad_capabilities(hostdata); |
c1988e31 RJ |
1004 | } |
1005 | ||
1006 | /** | |
1007 | * init_host - Start host initialization | |
1008 | * @hostdata: ibmvscsi_host_data of host | |
1009 | * | |
1010 | * Returns zero if successful. | |
1011 | */ | |
1012 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) | |
1013 | { | |
1014 | int rc; | |
1015 | unsigned long flags; | |
1016 | struct viosrp_fast_fail *fast_fail_mad; | |
1017 | struct srp_event_struct *evt_struct; | |
1018 | ||
126c5cc3 BK |
1019 | if (!fast_fail) { |
1020 | send_mad_capabilities(hostdata); | |
1021 | return 0; | |
1022 | } | |
c1988e31 RJ |
1023 | |
1024 | evt_struct = get_event_struct(&hostdata->pool); | |
1025 | BUG_ON(!evt_struct); | |
1026 | ||
1027 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); | |
1028 | ||
1029 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; | |
1030 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); | |
1031 | fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL; | |
1032 | fast_fail_mad->common.length = sizeof(*fast_fail_mad); | |
1033 | ||
1034 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1035 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); | |
1036 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1037 | return rc; | |
1038 | } | |
1039 | ||
1da177e4 LT |
1040 | /** |
1041 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
1042 | * @evt_struct: srp_event_struct with the response | |
1043 | * | |
1044 | * Used as a "done" callback by when sending adapter_info. Gets called | |
1045 | * by ibmvscsi_handle_crq() | |
1046 | */ | |
1047 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
1048 | { | |
1049 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1da177e4 LT |
1050 | |
1051 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
1052 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
1053 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 1054 | } else { |
6c0a60ec BK |
1055 | dev_info(hostdata->dev, "host srp version: %s, " |
1056 | "host partition %s (%d), OS %d, max io %u\n", | |
1057 | hostdata->madapter_info.srp_version, | |
1058 | hostdata->madapter_info.partition_name, | |
1059 | hostdata->madapter_info.partition_number, | |
1060 | hostdata->madapter_info.os_type, | |
1061 | hostdata->madapter_info.port_max_txu[0]); | |
1da177e4 LT |
1062 | |
1063 | if (hostdata->madapter_info.port_max_txu[0]) | |
1064 | hostdata->host->max_sectors = | |
1065 | hostdata->madapter_info.port_max_txu[0] >> 9; | |
154fb614 DB |
1066 | |
1067 | if (hostdata->madapter_info.os_type == 3 && | |
1068 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { | |
6c0a60ec BK |
1069 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
1070 | hostdata->madapter_info.srp_version); | |
1071 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
1072 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
1073 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
1074 | } | |
e08afeb7 BK |
1075 | |
1076 | if (hostdata->madapter_info.os_type == 3) { | |
1077 | enable_fast_fail(hostdata); | |
1078 | return; | |
1079 | } | |
1da177e4 | 1080 | } |
3507e13f | 1081 | |
e08afeb7 | 1082 | send_srp_login(hostdata); |
1da177e4 LT |
1083 | } |
1084 | ||
1085 | /** | |
1086 | * send_mad_adapter_info: - Sends the mad adapter info request | |
1087 | * and stores the result so it can be retrieved with | |
1088 | * sysfs. We COULD consider causing a failure if the | |
1089 | * returned SRP version doesn't match ours. | |
1090 | * @hostdata: ibmvscsi_host_data of host | |
1091 | * | |
1092 | * Returns zero if successful. | |
1093 | */ | |
1094 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
1095 | { | |
1096 | struct viosrp_adapter_info *req; | |
1097 | struct srp_event_struct *evt_struct; | |
06f923cb | 1098 | unsigned long flags; |
e5dbfa66 | 1099 | |
1da177e4 | 1100 | evt_struct = get_event_struct(&hostdata->pool); |
3507e13f | 1101 | BUG_ON(!evt_struct); |
1da177e4 LT |
1102 | |
1103 | init_event_struct(evt_struct, | |
1104 | adapter_info_rsp, | |
1105 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1106 | info_timeout); |
1da177e4 LT |
1107 | |
1108 | req = &evt_struct->iu.mad.adapter_info; | |
1109 | memset(req, 0x00, sizeof(*req)); | |
1110 | ||
1111 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; | |
1112 | req->common.length = sizeof(hostdata->madapter_info); | |
126c5cc3 | 1113 | req->buffer = hostdata->adapter_info_addr; |
1da177e4 | 1114 | |
06f923cb | 1115 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
126c5cc3 | 1116 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
6c0a60ec | 1117 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
06f923cb | 1118 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1119 | }; |
1120 | ||
1121 | /** | |
3507e13f | 1122 | * init_adapter: Start virtual adapter initialization sequence |
1da177e4 | 1123 | * |
3507e13f BK |
1124 | */ |
1125 | static void init_adapter(struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1126 | { |
1da177e4 | 1127 | send_mad_adapter_info(hostdata); |
1da177e4 LT |
1128 | } |
1129 | ||
1da177e4 LT |
1130 | /** |
1131 | * sync_completion: Signal that a synchronous command has completed | |
1132 | * Note that after returning from this call, the evt_struct is freed. | |
1133 | * the caller waiting on this completion shouldn't touch the evt_struct | |
1134 | * again. | |
1135 | */ | |
1136 | static void sync_completion(struct srp_event_struct *evt_struct) | |
1137 | { | |
1138 | /* copy the response back */ | |
1139 | if (evt_struct->sync_srp) | |
1140 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
1141 | ||
1142 | complete(&evt_struct->comp); | |
1143 | } | |
1144 | ||
1145 | /** | |
1146 | * ibmvscsi_abort: Abort a command...from scsi host template | |
1147 | * send this over to the server and wait synchronously for the response | |
1148 | */ | |
1149 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
1150 | { | |
7603e02e | 1151 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1152 | struct srp_tsk_mgmt *tsk_mgmt; |
1153 | struct srp_event_struct *evt; | |
1154 | struct srp_event_struct *tmp_evt, *found_evt; | |
1155 | union viosrp_iu srp_rsp; | |
1156 | int rsp_rc; | |
be042f24 | 1157 | unsigned long flags; |
1da177e4 | 1158 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1159 | unsigned long wait_switch = 0; |
1da177e4 LT |
1160 | |
1161 | /* First, find this command in our sent list so we can figure | |
1162 | * out the correct tag | |
1163 | */ | |
be042f24 | 1164 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1165 | wait_switch = jiffies + (init_timeout * HZ); |
1166 | do { | |
1167 | found_evt = NULL; | |
1168 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1169 | if (tmp_evt->cmnd == cmd) { | |
1170 | found_evt = tmp_evt; | |
1171 | break; | |
1172 | } | |
1da177e4 | 1173 | } |
1da177e4 | 1174 | |
860784c8 RJ |
1175 | if (!found_evt) { |
1176 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1177 | return SUCCESS; | |
1178 | } | |
1da177e4 | 1179 | |
860784c8 RJ |
1180 | evt = get_event_struct(&hostdata->pool); |
1181 | if (evt == NULL) { | |
1182 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1183 | sdev_printk(KERN_ERR, cmd->device, | |
1184 | "failed to allocate abort event\n"); | |
1185 | return FAILED; | |
1186 | } | |
1da177e4 | 1187 | |
860784c8 RJ |
1188 | init_event_struct(evt, |
1189 | sync_completion, | |
1190 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1191 | abort_timeout); |
1da177e4 | 1192 | |
860784c8 | 1193 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1194 | |
860784c8 RJ |
1195 | /* Set up an abort SRP command */ |
1196 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1197 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1198 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1199 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; | |
1200 | tsk_mgmt->task_tag = (u64) found_evt; | |
1201 | ||
1202 | evt->sync_srp = &srp_rsp; | |
1203 | ||
1204 | init_completion(&evt->comp); | |
e1a5ce5b | 1205 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
860784c8 RJ |
1206 | |
1207 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1208 | break; | |
1209 | ||
1210 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1211 | msleep(10); | |
1212 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1213 | } while (time_before(jiffies, wait_switch)); | |
1214 | ||
be042f24 | 1215 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1216 | |
be042f24 | 1217 | if (rsp_rc != 0) { |
6c0a60ec BK |
1218 | sdev_printk(KERN_ERR, cmd->device, |
1219 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1220 | return FAILED; |
1221 | } | |
1222 | ||
860784c8 | 1223 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1224 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1225 | (((u64) lun) << 48), (u64) found_evt); |
1226 | ||
1da177e4 | 1227 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1228 | |
1229 | /* make sure we got a good response */ | |
ef265673 | 1230 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1231 | if (printk_ratelimit()) |
6c0a60ec BK |
1232 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1233 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1234 | return FAILED; |
1235 | } | |
1236 | ||
ef265673 FT |
1237 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1238 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1239 | else |
1240 | rsp_rc = srp_rsp.srp.rsp.status; | |
1241 | ||
1242 | if (rsp_rc) { | |
1243 | if (printk_ratelimit()) | |
6c0a60ec | 1244 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1245 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1246 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1247 | return FAILED; |
1248 | } | |
1249 | ||
1250 | /* Because we dropped the spinlock above, it's possible | |
1251 | * The event is no longer in our list. Make sure it didn't | |
1252 | * complete while we were aborting | |
1253 | */ | |
be042f24 | 1254 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1255 | found_evt = NULL; |
1256 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1257 | if (tmp_evt->cmnd == cmd) { | |
1258 | found_evt = tmp_evt; | |
1259 | break; | |
1260 | } | |
1261 | } | |
1262 | ||
1263 | if (found_evt == NULL) { | |
be042f24 | 1264 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1265 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1266 | tsk_mgmt->task_tag); |
1da177e4 LT |
1267 | return SUCCESS; |
1268 | } | |
1269 | ||
fe333321 | 1270 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1271 | tsk_mgmt->task_tag); |
1da177e4 LT |
1272 | |
1273 | cmd->result = (DID_ABORT << 16); | |
1274 | list_del(&found_evt->list); | |
4dddbc26 JB |
1275 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1276 | found_evt->hostdata->dev); | |
1da177e4 | 1277 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1278 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1279 | atomic_inc(&hostdata->request_limit); |
1280 | return SUCCESS; | |
1281 | } | |
1282 | ||
1283 | /** | |
1284 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1285 | * template send this over to the server and wait synchronously for the | |
1286 | * response | |
1287 | */ | |
1288 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1289 | { | |
7603e02e | 1290 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1291 | struct srp_tsk_mgmt *tsk_mgmt; |
1292 | struct srp_event_struct *evt; | |
1293 | struct srp_event_struct *tmp_evt, *pos; | |
1294 | union viosrp_iu srp_rsp; | |
1295 | int rsp_rc; | |
be042f24 | 1296 | unsigned long flags; |
1da177e4 | 1297 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1298 | unsigned long wait_switch = 0; |
1da177e4 | 1299 | |
be042f24 | 1300 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1301 | wait_switch = jiffies + (init_timeout * HZ); |
1302 | do { | |
1303 | evt = get_event_struct(&hostdata->pool); | |
1304 | if (evt == NULL) { | |
1305 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1306 | sdev_printk(KERN_ERR, cmd->device, | |
1307 | "failed to allocate reset event\n"); | |
1308 | return FAILED; | |
1309 | } | |
1da177e4 | 1310 | |
860784c8 RJ |
1311 | init_event_struct(evt, |
1312 | sync_completion, | |
1313 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1314 | reset_timeout); |
1da177e4 | 1315 | |
860784c8 | 1316 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1317 | |
860784c8 RJ |
1318 | /* Set up a lun reset SRP command */ |
1319 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1320 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1321 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1322 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; | |
1da177e4 | 1323 | |
860784c8 RJ |
1324 | evt->sync_srp = &srp_rsp; |
1325 | ||
1326 | init_completion(&evt->comp); | |
e1a5ce5b | 1327 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
860784c8 RJ |
1328 | |
1329 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1330 | break; | |
1331 | ||
1332 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1333 | msleep(10); | |
1334 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1335 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1336 | |
be042f24 | 1337 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1338 | |
be042f24 | 1339 | if (rsp_rc != 0) { |
6c0a60ec BK |
1340 | sdev_printk(KERN_ERR, cmd->device, |
1341 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1342 | return FAILED; |
1343 | } | |
1344 | ||
fe333321 | 1345 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1346 | (((u64) lun) << 48)); |
1347 | ||
1da177e4 | 1348 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1349 | |
1350 | /* make sure we got a good response */ | |
ef265673 | 1351 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1352 | if (printk_ratelimit()) |
6c0a60ec BK |
1353 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1354 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1355 | return FAILED; |
1356 | } | |
1357 | ||
ef265673 FT |
1358 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1359 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1360 | else |
1361 | rsp_rc = srp_rsp.srp.rsp.status; | |
1362 | ||
1363 | if (rsp_rc) { | |
1364 | if (printk_ratelimit()) | |
6c0a60ec | 1365 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1366 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1367 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1368 | return FAILED; |
1369 | } | |
1370 | ||
1371 | /* We need to find all commands for this LUN that have not yet been | |
1372 | * responded to, and fail them with DID_RESET | |
1373 | */ | |
be042f24 | 1374 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1375 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1376 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1377 | if (tmp_evt->cmnd) | |
1378 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1379 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1380 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1381 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1382 | free_event_struct(&tmp_evt->hostdata->pool, |
1383 | tmp_evt); | |
1384 | atomic_inc(&hostdata->request_limit); | |
1385 | if (tmp_evt->cmnd_done) | |
1386 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1387 | else if (tmp_evt->done) | |
1388 | tmp_evt->done(tmp_evt); | |
1389 | } | |
1390 | } | |
be042f24 | 1391 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1392 | return SUCCESS; |
1393 | } | |
1394 | ||
1395 | /** | |
3d0e91f7 BK |
1396 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1397 | * @cmd: struct scsi_cmnd having problems | |
1398 | */ | |
1399 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1400 | { |
3d0e91f7 | 1401 | unsigned long wait_switch = 0; |
7603e02e | 1402 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1403 | |
3d0e91f7 BK |
1404 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1405 | ||
1406 | ibmvscsi_reset_host(hostdata); | |
1407 | ||
1408 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1409 | time_before(jiffies, wait_switch) && | |
1410 | atomic_read(&hostdata->request_limit) < 2;) { | |
1411 | ||
1412 | msleep(10); | |
1da177e4 | 1413 | } |
3d0e91f7 BK |
1414 | |
1415 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1416 | return FAILED; | |
1417 | ||
1418 | return SUCCESS; | |
1da177e4 LT |
1419 | } |
1420 | ||
1421 | /** | |
1422 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1423 | * @crq: Command/Response queue | |
1424 | * @hostdata: ibmvscsi_host_data of host | |
1425 | * | |
1426 | */ | |
1427 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, | |
1428 | struct ibmvscsi_host_data *hostdata) | |
1429 | { | |
6c0a60ec | 1430 | long rc; |
1da177e4 LT |
1431 | unsigned long flags; |
1432 | struct srp_event_struct *evt_struct = | |
1433 | (struct srp_event_struct *)crq->IU_data_ptr; | |
1434 | switch (crq->valid) { | |
1435 | case 0xC0: /* initialization */ | |
1436 | switch (crq->format) { | |
1437 | case 0x01: /* Initialization message */ | |
6c0a60ec | 1438 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1439 | /* Send back a response */ |
d3849d51 DW |
1440 | if ((rc = ibmvscsi_ops->send_crq(hostdata, |
1441 | 0xC002000000000000LL, 0)) == 0) { | |
1da177e4 | 1442 | /* Now login */ |
3507e13f | 1443 | init_adapter(hostdata); |
1da177e4 | 1444 | } else { |
6c0a60ec | 1445 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1446 | } |
1447 | ||
1448 | break; | |
1449 | case 0x02: /* Initialization response */ | |
6c0a60ec | 1450 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1451 | |
1452 | /* Now login */ | |
3507e13f | 1453 | init_adapter(hostdata); |
1da177e4 LT |
1454 | break; |
1455 | default: | |
6c0a60ec | 1456 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1457 | } |
1458 | return; | |
2b541f8f DB |
1459 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
1460 | scsi_block_requests(hostdata->host); | |
cefbda2d | 1461 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1462 | if (crq->format == 0x06) { |
1463 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1464 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
126c5cc3 | 1465 | hostdata->client_migrated = 1; |
0f33ece5 | 1466 | hostdata->reenable_crq = 1; |
2b541f8f | 1467 | purge_requests(hostdata, DID_REQUEUE); |
0f33ece5 | 1468 | wake_up(&hostdata->work_wait_q); |
2b541f8f | 1469 | } else { |
6c0a60ec BK |
1470 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1471 | crq->format); | |
0f33ece5 | 1472 | ibmvscsi_reset_host(hostdata); |
2b541f8f | 1473 | } |
1da177e4 LT |
1474 | return; |
1475 | case 0x80: /* real payload */ | |
1476 | break; | |
1477 | default: | |
6c0a60ec BK |
1478 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1479 | crq->valid); | |
1da177e4 LT |
1480 | return; |
1481 | } | |
1482 | ||
1483 | /* The only kind of payload CRQs we should get are responses to | |
1484 | * things we send. Make sure this response is to something we | |
1485 | * actually sent | |
1486 | */ | |
1487 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1488 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
1da177e4 LT |
1489 | (void *)crq->IU_data_ptr); |
1490 | return; | |
1491 | } | |
1492 | ||
1493 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec BK |
1494 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
1495 | (void *)crq->IU_data_ptr); | |
1da177e4 LT |
1496 | return; |
1497 | } | |
1498 | ||
1499 | if (crq->format == VIOSRP_SRP_FORMAT) | |
ef265673 | 1500 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
1da177e4 LT |
1501 | &hostdata->request_limit); |
1502 | ||
3d0e91f7 BK |
1503 | del_timer(&evt_struct->timer); |
1504 | ||
ca61668b | 1505 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1506 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1507 | if (evt_struct->done) |
1508 | evt_struct->done(evt_struct); | |
1509 | else | |
6c0a60ec | 1510 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1511 | |
1512 | /* | |
1513 | * Lock the host_lock before messing with these structures, since we | |
1514 | * are running in a task context | |
1515 | */ | |
1516 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1517 | list_del(&evt_struct->list); | |
1518 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1519 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1520 | } | |
1521 | ||
1522 | /** | |
1523 | * ibmvscsi_get_host_config: Send the command to the server to get host | |
1524 | * configuration data. The data is opaque to us. | |
1525 | */ | |
1526 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, | |
1527 | unsigned char *buffer, int length) | |
1528 | { | |
1529 | struct viosrp_host_config *host_config; | |
1530 | struct srp_event_struct *evt_struct; | |
06f923cb | 1531 | unsigned long flags; |
e5dbfa66 | 1532 | dma_addr_t addr; |
1da177e4 LT |
1533 | int rc; |
1534 | ||
1535 | evt_struct = get_event_struct(&hostdata->pool); | |
1536 | if (!evt_struct) { | |
6c0a60ec | 1537 | dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n"); |
1da177e4 LT |
1538 | return -1; |
1539 | } | |
1540 | ||
1541 | init_event_struct(evt_struct, | |
1542 | sync_completion, | |
1543 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1544 | info_timeout); |
1da177e4 LT |
1545 | |
1546 | host_config = &evt_struct->iu.mad.host_config; | |
1547 | ||
1548 | /* Set up a lun reset SRP command */ | |
1549 | memset(host_config, 0x00, sizeof(*host_config)); | |
1550 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; | |
1551 | host_config->common.length = length; | |
e5dbfa66 FT |
1552 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
1553 | length, | |
1554 | DMA_BIDIRECTIONAL); | |
1da177e4 | 1555 | |
8d8bb39b | 1556 | if (dma_mapping_error(hostdata->dev, host_config->buffer)) { |
7912a0ac RJ |
1557 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1558 | dev_err(hostdata->dev, | |
1559 | "dma_mapping error getting host config\n"); | |
1da177e4 LT |
1560 | free_event_struct(&hostdata->pool, evt_struct); |
1561 | return -1; | |
1562 | } | |
1563 | ||
1564 | init_completion(&evt_struct->comp); | |
06f923cb | 1565 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
e1a5ce5b | 1566 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); |
06f923cb | 1567 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
e5dbfa66 | 1568 | if (rc == 0) |
1da177e4 | 1569 | wait_for_completion(&evt_struct->comp); |
e5dbfa66 | 1570 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
1da177e4 LT |
1571 | |
1572 | return rc; | |
1573 | } | |
1574 | ||
0979c84b RJ |
1575 | /** |
1576 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1577 | * @sdev: struct scsi_device device to configure | |
1578 | * | |
1579 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1580 | * queue_depth here also as is required by the documentation for | |
1581 | * struct scsi_host_template. | |
1582 | */ | |
1583 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1584 | { | |
1585 | struct Scsi_Host *shost = sdev->host; | |
1586 | unsigned long lock_flags = 0; | |
1587 | ||
1588 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1589 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1590 | sdev->allow_restart = 1; |
e1a5ce5b | 1591 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
d1a357fc | 1592 | } |
0979c84b RJ |
1593 | scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); |
1594 | spin_unlock_irqrestore(shost->host_lock, lock_flags); | |
1595 | return 0; | |
1596 | } | |
1597 | ||
742d25b8 BK |
1598 | /** |
1599 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1600 | * @sdev: scsi device struct | |
1601 | * @qdepth: depth to set | |
e881a172 | 1602 | * @reason: calling context |
742d25b8 BK |
1603 | * |
1604 | * Return value: | |
1605 | * actual depth set | |
1606 | **/ | |
e881a172 MC |
1607 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth, |
1608 | int reason) | |
742d25b8 | 1609 | { |
e881a172 MC |
1610 | if (reason != SCSI_QDEPTH_DEFAULT) |
1611 | return -EOPNOTSUPP; | |
1612 | ||
742d25b8 BK |
1613 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) |
1614 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
1615 | ||
1616 | scsi_adjust_queue_depth(sdev, 0, qdepth); | |
1617 | return sdev->queue_depth; | |
1618 | } | |
1619 | ||
1da177e4 LT |
1620 | /* ------------------------------------------------------------ |
1621 | * sysfs attributes | |
1622 | */ | |
126c5cc3 BK |
1623 | static ssize_t show_host_vhost_loc(struct device *dev, |
1624 | struct device_attribute *attr, char *buf) | |
1625 | { | |
1626 | struct Scsi_Host *shost = class_to_shost(dev); | |
1627 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1628 | int len; | |
1629 | ||
1630 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", | |
1631 | hostdata->caps.loc); | |
1632 | return len; | |
1633 | } | |
1634 | ||
1635 | static struct device_attribute ibmvscsi_host_vhost_loc = { | |
1636 | .attr = { | |
1637 | .name = "vhost_loc", | |
1638 | .mode = S_IRUGO, | |
1639 | }, | |
1640 | .show = show_host_vhost_loc, | |
1641 | }; | |
1642 | ||
1643 | static ssize_t show_host_vhost_name(struct device *dev, | |
1644 | struct device_attribute *attr, char *buf) | |
1645 | { | |
1646 | struct Scsi_Host *shost = class_to_shost(dev); | |
1647 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1648 | int len; | |
1649 | ||
1650 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", | |
1651 | hostdata->caps.name); | |
1652 | return len; | |
1653 | } | |
1654 | ||
1655 | static struct device_attribute ibmvscsi_host_vhost_name = { | |
1656 | .attr = { | |
1657 | .name = "vhost_name", | |
1658 | .mode = S_IRUGO, | |
1659 | }, | |
1660 | .show = show_host_vhost_name, | |
1661 | }; | |
1662 | ||
ee959b00 TJ |
1663 | static ssize_t show_host_srp_version(struct device *dev, |
1664 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1665 | { |
ee959b00 | 1666 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1667 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1668 | int len; |
1669 | ||
1670 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1671 | hostdata->madapter_info.srp_version); | |
1672 | return len; | |
1673 | } | |
1674 | ||
ee959b00 | 1675 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1676 | .attr = { |
1677 | .name = "srp_version", | |
1678 | .mode = S_IRUGO, | |
1679 | }, | |
1680 | .show = show_host_srp_version, | |
1681 | }; | |
1682 | ||
ee959b00 TJ |
1683 | static ssize_t show_host_partition_name(struct device *dev, |
1684 | struct device_attribute *attr, | |
1da177e4 LT |
1685 | char *buf) |
1686 | { | |
ee959b00 | 1687 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1688 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1689 | int len; |
1690 | ||
1691 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1692 | hostdata->madapter_info.partition_name); | |
1693 | return len; | |
1694 | } | |
1695 | ||
ee959b00 | 1696 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
1697 | .attr = { |
1698 | .name = "partition_name", | |
1699 | .mode = S_IRUGO, | |
1700 | }, | |
1701 | .show = show_host_partition_name, | |
1702 | }; | |
1703 | ||
ee959b00 TJ |
1704 | static ssize_t show_host_partition_number(struct device *dev, |
1705 | struct device_attribute *attr, | |
1da177e4 LT |
1706 | char *buf) |
1707 | { | |
ee959b00 | 1708 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1709 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1710 | int len; |
1711 | ||
1712 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1713 | hostdata->madapter_info.partition_number); | |
1714 | return len; | |
1715 | } | |
1716 | ||
ee959b00 | 1717 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
1718 | .attr = { |
1719 | .name = "partition_number", | |
1720 | .mode = S_IRUGO, | |
1721 | }, | |
1722 | .show = show_host_partition_number, | |
1723 | }; | |
1724 | ||
ee959b00 TJ |
1725 | static ssize_t show_host_mad_version(struct device *dev, |
1726 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1727 | { |
ee959b00 | 1728 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1729 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1730 | int len; |
1731 | ||
1732 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1733 | hostdata->madapter_info.mad_version); | |
1734 | return len; | |
1735 | } | |
1736 | ||
ee959b00 | 1737 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
1738 | .attr = { |
1739 | .name = "mad_version", | |
1740 | .mode = S_IRUGO, | |
1741 | }, | |
1742 | .show = show_host_mad_version, | |
1743 | }; | |
1744 | ||
ee959b00 TJ |
1745 | static ssize_t show_host_os_type(struct device *dev, |
1746 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1747 | { |
ee959b00 | 1748 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1749 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1750 | int len; |
1751 | ||
1752 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); | |
1753 | return len; | |
1754 | } | |
1755 | ||
ee959b00 | 1756 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
1757 | .attr = { |
1758 | .name = "os_type", | |
1759 | .mode = S_IRUGO, | |
1760 | }, | |
1761 | .show = show_host_os_type, | |
1762 | }; | |
1763 | ||
ee959b00 TJ |
1764 | static ssize_t show_host_config(struct device *dev, |
1765 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1766 | { |
ee959b00 | 1767 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1768 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1769 | |
1770 | /* returns null-terminated host config data */ | |
1771 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) | |
1772 | return strlen(buf); | |
1773 | else | |
1774 | return 0; | |
1775 | } | |
1776 | ||
ee959b00 | 1777 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 LT |
1778 | .attr = { |
1779 | .name = "config", | |
1780 | .mode = S_IRUGO, | |
1781 | }, | |
1782 | .show = show_host_config, | |
1783 | }; | |
1784 | ||
ee959b00 | 1785 | static struct device_attribute *ibmvscsi_attrs[] = { |
126c5cc3 BK |
1786 | &ibmvscsi_host_vhost_loc, |
1787 | &ibmvscsi_host_vhost_name, | |
1da177e4 LT |
1788 | &ibmvscsi_host_srp_version, |
1789 | &ibmvscsi_host_partition_name, | |
1790 | &ibmvscsi_host_partition_number, | |
1791 | &ibmvscsi_host_mad_version, | |
1792 | &ibmvscsi_host_os_type, | |
1793 | &ibmvscsi_host_config, | |
1794 | NULL | |
1795 | }; | |
1796 | ||
1797 | /* ------------------------------------------------------------ | |
1798 | * SCSI driver registration | |
1799 | */ | |
1800 | static struct scsi_host_template driver_template = { | |
1801 | .module = THIS_MODULE, | |
1802 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
1803 | .proc_name = "ibmvscsi", | |
1804 | .queuecommand = ibmvscsi_queuecommand, | |
1805 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
1806 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 1807 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 1808 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 1809 | .change_queue_depth = ibmvscsi_change_queue_depth, |
7912a0ac | 1810 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 1811 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 1812 | .this_id = -1, |
4dddbc26 | 1813 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
1814 | .use_clustering = ENABLE_CLUSTERING, |
1815 | .shost_attrs = ibmvscsi_attrs, | |
1816 | }; | |
1817 | ||
7912a0ac RJ |
1818 | /** |
1819 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
1820 | * | |
1821 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
1822 | * | |
1823 | * Return value: | |
1824 | * Number of bytes of IO data the driver will need to perform well. | |
1825 | */ | |
1826 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
1827 | { | |
1828 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 1829 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
1830 | |
1831 | /* add io space for sg data */ | |
004dd5e8 | 1832 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
1833 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
1834 | ||
1835 | return desired_io; | |
1836 | } | |
1837 | ||
0f33ece5 BK |
1838 | static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) |
1839 | { | |
1840 | int rc; | |
1841 | char *action = "reset"; | |
1842 | ||
1843 | if (hostdata->reset_crq) { | |
1844 | smp_rmb(); | |
1845 | hostdata->reset_crq = 0; | |
1846 | ||
1847 | rc = ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata); | |
1848 | if (!rc) | |
1849 | rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0); | |
1850 | if (!rc) | |
1851 | rc = vio_enable_interrupts(to_vio_dev(hostdata->dev)); | |
1852 | } else if (hostdata->reenable_crq) { | |
1853 | smp_rmb(); | |
1854 | action = "enable"; | |
1855 | rc = ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, hostdata); | |
1856 | hostdata->reenable_crq = 0; | |
1857 | if (!rc) | |
1858 | rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0); | |
1859 | } else | |
1860 | return; | |
1861 | ||
1862 | if (rc) { | |
1863 | atomic_set(&hostdata->request_limit, -1); | |
1864 | dev_err(hostdata->dev, "error after %s\n", action); | |
1865 | } | |
1866 | ||
1867 | scsi_unblock_requests(hostdata->host); | |
1868 | } | |
1869 | ||
1870 | static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) | |
1871 | { | |
1872 | if (kthread_should_stop()) | |
1873 | return 1; | |
1874 | else if (hostdata->reset_crq) { | |
1875 | smp_rmb(); | |
1876 | return 1; | |
1877 | } else if (hostdata->reenable_crq) { | |
1878 | smp_rmb(); | |
1879 | return 1; | |
1880 | } | |
1881 | ||
1882 | return 0; | |
1883 | } | |
1884 | ||
1885 | static int ibmvscsi_work(void *data) | |
1886 | { | |
1887 | struct ibmvscsi_host_data *hostdata = data; | |
1888 | int rc; | |
1889 | ||
1890 | set_user_nice(current, -20); | |
1891 | ||
1892 | while (1) { | |
1893 | rc = wait_event_interruptible(hostdata->work_wait_q, | |
1894 | ibmvscsi_work_to_do(hostdata)); | |
1895 | ||
1896 | BUG_ON(rc); | |
1897 | ||
1898 | if (kthread_should_stop()) | |
1899 | break; | |
1900 | ||
1901 | ibmvscsi_do_work(hostdata); | |
1902 | } | |
1903 | ||
1904 | return 0; | |
1905 | } | |
1906 | ||
1da177e4 LT |
1907 | /** |
1908 | * Called by bus code for each adapter | |
1909 | */ | |
1910 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
1911 | { | |
1912 | struct ibmvscsi_host_data *hostdata; | |
1913 | struct Scsi_Host *host; | |
1914 | struct device *dev = &vdev->dev; | |
4d680419 FT |
1915 | struct srp_rport_identifiers ids; |
1916 | struct srp_rport *rport; | |
1da177e4 | 1917 | unsigned long wait_switch = 0; |
cefbda2d | 1918 | int rc; |
1da177e4 | 1919 | |
559fde70 | 1920 | dev_set_drvdata(&vdev->dev, NULL); |
1da177e4 LT |
1921 | |
1922 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
1923 | if (!host) { | |
6c0a60ec | 1924 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
1925 | goto scsi_host_alloc_failed; |
1926 | } | |
1927 | ||
4d680419 | 1928 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 1929 | hostdata = shost_priv(host); |
1da177e4 LT |
1930 | memset(hostdata, 0x00, sizeof(*hostdata)); |
1931 | INIT_LIST_HEAD(&hostdata->sent); | |
0f33ece5 | 1932 | init_waitqueue_head(&hostdata->work_wait_q); |
1da177e4 LT |
1933 | hostdata->host = host; |
1934 | hostdata->dev = dev; | |
1935 | atomic_set(&hostdata->request_limit, -1); | |
7912a0ac | 1936 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 1937 | |
126c5cc3 BK |
1938 | if (map_persist_bufs(hostdata)) { |
1939 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); | |
1940 | goto persist_bufs_failed; | |
1941 | } | |
1942 | ||
0f33ece5 BK |
1943 | hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d", |
1944 | "ibmvscsi", host->host_no); | |
1945 | ||
1946 | if (IS_ERR(hostdata->work_thread)) { | |
1947 | dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n", | |
1948 | PTR_ERR(hostdata->work_thread)); | |
1949 | goto init_crq_failed; | |
1950 | } | |
1951 | ||
4f10aae0 | 1952 | rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 1953 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 1954 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
0f33ece5 | 1955 | goto kill_kthread; |
1da177e4 | 1956 | } |
4f10aae0 | 1957 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 1958 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
1959 | goto init_pool_failed; |
1960 | } | |
1961 | ||
1962 | host->max_lun = 8; | |
1963 | host->max_id = max_id; | |
1964 | host->max_channel = max_channel; | |
fbc56f08 | 1965 | host->max_cmd_len = 16; |
1da177e4 LT |
1966 | |
1967 | if (scsi_add_host(hostdata->host, hostdata->dev)) | |
1968 | goto add_host_failed; | |
1969 | ||
4d680419 FT |
1970 | /* we don't have a proper target_port_id so let's use the fake one */ |
1971 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
1972 | sizeof(ids.port_id)); | |
aebd5e47 | 1973 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
1974 | rport = srp_rport_add(host, &ids); |
1975 | if (IS_ERR(rport)) | |
1976 | goto add_srp_port_failed; | |
1977 | ||
1da177e4 LT |
1978 | /* Try to send an initialization message. Note that this is allowed |
1979 | * to fail if the other end is not acive. In that case we don't | |
1980 | * want to scan | |
1981 | */ | |
d3849d51 | 1982 | if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 1983 | || rc == H_RESOURCE) { |
1da177e4 LT |
1984 | /* |
1985 | * Wait around max init_timeout secs for the adapter to finish | |
1986 | * initializing. When we are done initializing, we will have a | |
1987 | * valid request_limit. We don't want Linux scanning before | |
1988 | * we are ready. | |
1989 | */ | |
1990 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1991 | time_before(jiffies, wait_switch) && | |
1992 | atomic_read(&hostdata->request_limit) < 2;) { | |
1993 | ||
1994 | msleep(10); | |
1995 | } | |
1996 | ||
1997 | /* if we now have a valid request_limit, initiate a scan */ | |
1998 | if (atomic_read(&hostdata->request_limit) > 0) | |
1999 | scsi_scan_host(host); | |
2000 | } | |
2001 | ||
559fde70 | 2002 | dev_set_drvdata(&vdev->dev, hostdata); |
1da177e4 LT |
2003 | return 0; |
2004 | ||
4d680419 FT |
2005 | add_srp_port_failed: |
2006 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
2007 | add_host_failed: |
2008 | release_event_pool(&hostdata->pool, hostdata); | |
2009 | init_pool_failed: | |
4f10aae0 | 2010 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events); |
0f33ece5 BK |
2011 | kill_kthread: |
2012 | kthread_stop(hostdata->work_thread); | |
1da177e4 | 2013 | init_crq_failed: |
126c5cc3 BK |
2014 | unmap_persist_bufs(hostdata); |
2015 | persist_bufs_failed: | |
1da177e4 LT |
2016 | scsi_host_put(host); |
2017 | scsi_host_alloc_failed: | |
2018 | return -1; | |
2019 | } | |
2020 | ||
2021 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
2022 | { | |
559fde70 | 2023 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
126c5cc3 | 2024 | unmap_persist_bufs(hostdata); |
1da177e4 | 2025 | release_event_pool(&hostdata->pool, hostdata); |
d3849d51 | 2026 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 2027 | max_events); |
4d680419 | 2028 | |
0f33ece5 | 2029 | kthread_stop(hostdata->work_thread); |
4d680419 | 2030 | srp_remove_host(hostdata->host); |
1da177e4 LT |
2031 | scsi_remove_host(hostdata->host); |
2032 | scsi_host_put(hostdata->host); | |
2033 | ||
2034 | return 0; | |
2035 | } | |
2036 | ||
64355b92 BK |
2037 | /** |
2038 | * ibmvscsi_resume: Resume from suspend | |
2039 | * @dev: device struct | |
2040 | * | |
2041 | * We may have lost an interrupt across suspend/resume, so kick the | |
2042 | * interrupt handler | |
2043 | */ | |
2044 | static int ibmvscsi_resume(struct device *dev) | |
2045 | { | |
2046 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); | |
2047 | return ibmvscsi_ops->resume(hostdata); | |
2048 | } | |
2049 | ||
1da177e4 LT |
2050 | /** |
2051 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
2052 | * support. | |
2053 | */ | |
2054 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { | |
2055 | {"vscsi", "IBM,v-scsi"}, | |
fb120da6 | 2056 | { "", "" } |
1da177e4 | 2057 | }; |
1da177e4 | 2058 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 2059 | |
64355b92 BK |
2060 | static struct dev_pm_ops ibmvscsi_pm_ops = { |
2061 | .resume = ibmvscsi_resume | |
2062 | }; | |
2063 | ||
1da177e4 | 2064 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
2065 | .id_table = ibmvscsi_device_table, |
2066 | .probe = ibmvscsi_probe, | |
6fdf5392 | 2067 | .remove = ibmvscsi_remove, |
7912a0ac | 2068 | .get_desired_dma = ibmvscsi_get_desired_dma, |
6fdf5392 SR |
2069 | .driver = { |
2070 | .name = "ibmvscsi", | |
915124d8 | 2071 | .owner = THIS_MODULE, |
64355b92 | 2072 | .pm = &ibmvscsi_pm_ops, |
6fdf5392 | 2073 | } |
1da177e4 LT |
2074 | }; |
2075 | ||
4d680419 FT |
2076 | static struct srp_function_template ibmvscsi_transport_functions = { |
2077 | }; | |
2078 | ||
1da177e4 LT |
2079 | int __init ibmvscsi_module_init(void) |
2080 | { | |
4d680419 FT |
2081 | int ret; |
2082 | ||
4f10aae0 BK |
2083 | /* Ensure we have two requests to do error recovery */ |
2084 | driver_template.can_queue = max_requests; | |
2085 | max_events = max_requests + 2; | |
2086 | ||
d3849d51 DW |
2087 | if (firmware_has_feature(FW_FEATURE_ISERIES)) |
2088 | ibmvscsi_ops = &iseriesvscsi_ops; | |
2089 | else if (firmware_has_feature(FW_FEATURE_VIO)) | |
2090 | ibmvscsi_ops = &rpavscsi_ops; | |
2091 | else | |
2092 | return -ENODEV; | |
2093 | ||
4d680419 FT |
2094 | ibmvscsi_transport_template = |
2095 | srp_attach_transport(&ibmvscsi_transport_functions); | |
2096 | if (!ibmvscsi_transport_template) | |
2097 | return -ENOMEM; | |
2098 | ||
2099 | ret = vio_register_driver(&ibmvscsi_driver); | |
2100 | if (ret) | |
2101 | srp_release_transport(ibmvscsi_transport_template); | |
2102 | return ret; | |
1da177e4 LT |
2103 | } |
2104 | ||
2105 | void __exit ibmvscsi_module_exit(void) | |
2106 | { | |
2107 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 2108 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
2109 | } |
2110 | ||
2111 | module_init(ibmvscsi_module_init); | |
2112 | module_exit(ibmvscsi_module_exit); |