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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 | |
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> | |
d3849d51 | 73 | #include <asm/firmware.h> |
1da177e4 | 74 | #include <asm/vio.h> |
7912a0ac | 75 | #include <asm/firmware.h> |
1da177e4 LT |
76 | #include <scsi/scsi.h> |
77 | #include <scsi/scsi_cmnd.h> | |
78 | #include <scsi/scsi_host.h> | |
79 | #include <scsi/scsi_device.h> | |
4d680419 | 80 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
81 | #include "ibmvscsi.h" |
82 | ||
83 | /* The values below are somewhat arbitrary default values, but | |
84 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
85 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
86 | * 5 bits of LUN. | |
87 | */ | |
88 | static int max_id = 64; | |
89 | static int max_channel = 3; | |
90 | static int init_timeout = 5; | |
a897ff2a | 91 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
4f10aae0 | 92 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
1da177e4 | 93 | |
4d680419 FT |
94 | static struct scsi_transport_template *ibmvscsi_transport_template; |
95 | ||
2b541f8f | 96 | #define IBMVSCSI_VERSION "1.5.8" |
1da177e4 | 97 | |
d3849d51 DW |
98 | static struct ibmvscsi_ops *ibmvscsi_ops; |
99 | ||
1da177e4 LT |
100 | MODULE_DESCRIPTION("IBM Virtual SCSI"); |
101 | MODULE_AUTHOR("Dave Boutcher"); | |
102 | MODULE_LICENSE("GPL"); | |
103 | MODULE_VERSION(IBMVSCSI_VERSION); | |
104 | ||
105 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
106 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); | |
107 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); | |
108 | MODULE_PARM_DESC(max_channel, "Largest channel value"); | |
109 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); | |
110 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
21465eda | 111 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
1da177e4 LT |
112 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
113 | ||
114 | /* ------------------------------------------------------------ | |
115 | * Routines for the event pool and event structs | |
116 | */ | |
117 | /** | |
118 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
119 | * @pool: event_pool to be initialized | |
120 | * @size: Number of events in pool | |
121 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
122 | * | |
123 | * Returns zero on success. | |
124 | */ | |
125 | static int initialize_event_pool(struct event_pool *pool, | |
126 | int size, struct ibmvscsi_host_data *hostdata) | |
127 | { | |
128 | int i; | |
129 | ||
130 | pool->size = size; | |
131 | pool->next = 0; | |
4c021dd1 | 132 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
133 | if (!pool->events) |
134 | return -ENOMEM; | |
1da177e4 LT |
135 | |
136 | pool->iu_storage = | |
137 | dma_alloc_coherent(hostdata->dev, | |
138 | pool->size * sizeof(*pool->iu_storage), | |
139 | &pool->iu_token, 0); | |
140 | if (!pool->iu_storage) { | |
141 | kfree(pool->events); | |
142 | return -ENOMEM; | |
143 | } | |
144 | ||
145 | for (i = 0; i < pool->size; ++i) { | |
146 | struct srp_event_struct *evt = &pool->events[i]; | |
147 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
148 | atomic_set(&evt->free, 1); | |
149 | evt->crq.valid = 0x80; | |
150 | evt->crq.IU_length = sizeof(*evt->xfer_iu); | |
151 | evt->crq.IU_data_ptr = pool->iu_token + | |
152 | sizeof(*evt->xfer_iu) * i; | |
153 | evt->xfer_iu = pool->iu_storage + i; | |
154 | evt->hostdata = hostdata; | |
4dddbc26 JB |
155 | evt->ext_list = NULL; |
156 | evt->ext_list_token = 0; | |
1da177e4 LT |
157 | } |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | /** | |
163 | * release_event_pool: - Frees memory of an event pool of a host | |
164 | * @pool: event_pool to be released | |
165 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
166 | * | |
167 | * Returns zero on success. | |
168 | */ | |
169 | static void release_event_pool(struct event_pool *pool, | |
170 | struct ibmvscsi_host_data *hostdata) | |
171 | { | |
172 | int i, in_use = 0; | |
4dddbc26 | 173 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
174 | if (atomic_read(&pool->events[i].free) != 1) |
175 | ++in_use; | |
4dddbc26 JB |
176 | if (pool->events[i].ext_list) { |
177 | dma_free_coherent(hostdata->dev, | |
ef265673 | 178 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
179 | pool->events[i].ext_list, |
180 | pool->events[i].ext_list_token); | |
181 | } | |
182 | } | |
1da177e4 | 183 | if (in_use) |
6c0a60ec BK |
184 | dev_warn(hostdata->dev, "releasing event pool with %d " |
185 | "events still in use?\n", in_use); | |
1da177e4 LT |
186 | kfree(pool->events); |
187 | dma_free_coherent(hostdata->dev, | |
188 | pool->size * sizeof(*pool->iu_storage), | |
189 | pool->iu_storage, pool->iu_token); | |
190 | } | |
191 | ||
192 | /** | |
193 | * valid_event_struct: - Determines if event is valid. | |
194 | * @pool: event_pool that contains the event | |
195 | * @evt: srp_event_struct to be checked for validity | |
196 | * | |
197 | * Returns zero if event is invalid, one otherwise. | |
198 | */ | |
199 | static int valid_event_struct(struct event_pool *pool, | |
200 | struct srp_event_struct *evt) | |
201 | { | |
202 | int index = evt - pool->events; | |
203 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
204 | return 0; | |
205 | if (evt != pool->events + index) /* unaligned */ | |
206 | return 0; | |
207 | return 1; | |
208 | } | |
209 | ||
210 | /** | |
211 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
212 | * @pool: event_pool that contains the event | |
213 | * @evt: srp_event_struct to be modified | |
214 | * | |
215 | */ | |
216 | static void free_event_struct(struct event_pool *pool, | |
217 | struct srp_event_struct *evt) | |
218 | { | |
219 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
220 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
221 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
222 | return; |
223 | } | |
224 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
225 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
226 | "which is not in use!\n", evt); | |
1da177e4 LT |
227 | return; |
228 | } | |
229 | } | |
230 | ||
231 | /** | |
232 | * get_evt_struct: - Gets the next free event in pool | |
233 | * @pool: event_pool that contains the events to be searched | |
234 | * | |
235 | * Returns the next event in "free" state, and NULL if none are free. | |
236 | * Note that no synchronization is done here, we assume the host_lock | |
237 | * will syncrhonze things. | |
238 | */ | |
239 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
240 | { | |
241 | int i; | |
242 | int poolsize = pool->size; | |
243 | int offset = pool->next; | |
244 | ||
245 | for (i = 0; i < poolsize; i++) { | |
246 | offset = (offset + 1) % poolsize; | |
247 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
248 | pool->next = offset; | |
249 | return &pool->events[offset]; | |
250 | } | |
251 | } | |
252 | ||
253 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
254 | return NULL; | |
255 | } | |
256 | ||
257 | /** | |
258 | * init_event_struct: Initialize fields in an event struct that are always | |
259 | * required. | |
260 | * @evt: The event | |
261 | * @done: Routine to call when the event is responded to | |
262 | * @format: SRP or MAD format | |
263 | * @timeout: timeout value set in the CRQ | |
264 | */ | |
265 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
266 | void (*done) (struct srp_event_struct *), | |
267 | u8 format, | |
268 | int timeout) | |
269 | { | |
270 | evt_struct->cmnd = NULL; | |
271 | evt_struct->cmnd_done = NULL; | |
272 | evt_struct->sync_srp = NULL; | |
273 | evt_struct->crq.format = format; | |
274 | evt_struct->crq.timeout = timeout; | |
275 | evt_struct->done = done; | |
276 | } | |
277 | ||
278 | /* ------------------------------------------------------------ | |
279 | * Routines for receiving SCSI responses from the hosting partition | |
280 | */ | |
281 | ||
282 | /** | |
283 | * set_srp_direction: Set the fields in the srp related to data | |
284 | * direction and number of buffers based on the direction in | |
285 | * the scsi_cmnd and the number of buffers | |
286 | */ | |
287 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
288 | struct srp_cmd *srp_cmd, | |
289 | int numbuf) | |
290 | { | |
ef265673 FT |
291 | u8 fmt; |
292 | ||
1da177e4 LT |
293 | if (numbuf == 0) |
294 | return; | |
295 | ||
ef265673 FT |
296 | if (numbuf == 1) |
297 | fmt = SRP_DATA_DESC_DIRECT; | |
298 | else { | |
299 | fmt = SRP_DATA_DESC_INDIRECT; | |
300 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
301 | ||
1da177e4 | 302 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
303 | srp_cmd->data_out_desc_cnt = numbuf; |
304 | else | |
305 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 306 | } |
ef265673 FT |
307 | |
308 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
309 | srp_cmd->buf_fmt = fmt << 4; | |
310 | else | |
311 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
312 | } |
313 | ||
ef265673 | 314 | static void unmap_sg_list(int num_entries, |
4dddbc26 | 315 | struct device *dev, |
ef265673 FT |
316 | struct srp_direct_buf *md) |
317 | { | |
4dddbc26 JB |
318 | int i; |
319 | ||
ef265673 FT |
320 | for (i = 0; i < num_entries; ++i) |
321 | dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL); | |
4dddbc26 JB |
322 | } |
323 | ||
1da177e4 LT |
324 | /** |
325 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
326 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
327 | * @dev: device for which the memory is mapped | |
328 | * | |
329 | */ | |
4dddbc26 JB |
330 | static void unmap_cmd_data(struct srp_cmd *cmd, |
331 | struct srp_event_struct *evt_struct, | |
332 | struct device *dev) | |
1da177e4 | 333 | { |
ef265673 FT |
334 | u8 out_fmt, in_fmt; |
335 | ||
336 | out_fmt = cmd->buf_fmt >> 4; | |
337 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
338 | ||
339 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 340 | return; |
ef265673 FT |
341 | else if (out_fmt == SRP_DATA_DESC_DIRECT || |
342 | in_fmt == SRP_DATA_DESC_DIRECT) { | |
343 | struct srp_direct_buf *data = | |
344 | (struct srp_direct_buf *) cmd->add_data; | |
345 | dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL); | |
1da177e4 | 346 | } else { |
ef265673 FT |
347 | struct srp_indirect_buf *indirect = |
348 | (struct srp_indirect_buf *) cmd->add_data; | |
349 | int num_mapped = indirect->table_desc.len / | |
350 | sizeof(struct srp_direct_buf); | |
4dddbc26 JB |
351 | |
352 | if (num_mapped <= MAX_INDIRECT_BUFS) { | |
ef265673 | 353 | unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]); |
4dddbc26 | 354 | return; |
1da177e4 | 355 | } |
4dddbc26 JB |
356 | |
357 | unmap_sg_list(num_mapped, dev, evt_struct->ext_list); | |
1da177e4 LT |
358 | } |
359 | } | |
360 | ||
9413d7b8 | 361 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 362 | struct srp_direct_buf *md) |
4dddbc26 JB |
363 | { |
364 | int i; | |
9413d7b8 | 365 | struct scatterlist *sg; |
4dddbc26 JB |
366 | u64 total_length = 0; |
367 | ||
9413d7b8 | 368 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 369 | struct srp_direct_buf *descr = md + i; |
9413d7b8 FT |
370 | descr->va = sg_dma_address(sg); |
371 | descr->len = sg_dma_len(sg); | |
ef265673 | 372 | descr->key = 0; |
9413d7b8 | 373 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
374 | } |
375 | return total_length; | |
376 | } | |
377 | ||
1da177e4 LT |
378 | /** |
379 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
380 | * @cmd: Scsi_Cmnd with the scatterlist | |
381 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
382 | * @dev: device for which to map dma memory | |
383 | * | |
384 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
385 | * Returns 1 on success. | |
386 | */ | |
387 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 388 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
389 | struct srp_cmd *srp_cmd, struct device *dev) |
390 | { | |
391 | ||
4dddbc26 | 392 | int sg_mapped; |
1da177e4 | 393 | u64 total_length = 0; |
ef265673 FT |
394 | struct srp_direct_buf *data = |
395 | (struct srp_direct_buf *) srp_cmd->add_data; | |
396 | struct srp_indirect_buf *indirect = | |
397 | (struct srp_indirect_buf *) data; | |
1da177e4 | 398 | |
9413d7b8 FT |
399 | sg_mapped = scsi_dma_map(cmd); |
400 | if (!sg_mapped) | |
401 | return 1; | |
402 | else if (sg_mapped < 0) | |
1da177e4 LT |
403 | return 0; |
404 | ||
405 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
406 | ||
407 | /* special case; we can use a single direct descriptor */ | |
408 | if (sg_mapped == 1) { | |
9413d7b8 | 409 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
410 | return 1; |
411 | } | |
412 | ||
ef265673 FT |
413 | indirect->table_desc.va = 0; |
414 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); | |
415 | indirect->table_desc.key = 0; | |
4dddbc26 JB |
416 | |
417 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 418 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 FT |
419 | &indirect->desc_list[0]); |
420 | indirect->len = total_length; | |
4dddbc26 | 421 | return 1; |
1da177e4 | 422 | } |
1da177e4 | 423 | |
4dddbc26 JB |
424 | /* get indirect table */ |
425 | if (!evt_struct->ext_list) { | |
ef265673 | 426 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 427 | dma_alloc_coherent(dev, |
ef265673 FT |
428 | SG_ALL * sizeof(struct srp_direct_buf), |
429 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 430 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
431 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
432 | sdev_printk(KERN_ERR, cmd->device, | |
433 | "Can't allocate memory " | |
434 | "for indirect table\n"); | |
e637d553 | 435 | scsi_dma_unmap(cmd); |
4dddbc26 | 436 | return 0; |
4dddbc26 JB |
437 | } |
438 | } | |
439 | ||
9413d7b8 | 440 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 441 | |
ef265673 FT |
442 | indirect->len = total_length; |
443 | indirect->table_desc.va = evt_struct->ext_list_token; | |
444 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); | |
445 | memcpy(indirect->desc_list, evt_struct->ext_list, | |
446 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 447 | return 1; |
1da177e4 LT |
448 | } |
449 | ||
1da177e4 LT |
450 | /** |
451 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
452 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
453 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
454 | * @dev: dma device for which to map dma memory | |
455 | * | |
456 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
457 | * Returns 1 on success. | |
458 | */ | |
459 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 460 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
461 | struct srp_cmd *srp_cmd, struct device *dev) |
462 | { | |
463 | switch (cmd->sc_data_direction) { | |
464 | case DMA_FROM_DEVICE: | |
465 | case DMA_TO_DEVICE: | |
466 | break; | |
467 | case DMA_NONE: | |
468 | return 1; | |
469 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
470 | sdev_printk(KERN_ERR, cmd->device, |
471 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
472 | return 0; |
473 | default: | |
6c0a60ec BK |
474 | sdev_printk(KERN_ERR, cmd->device, |
475 | "Unknown data direction 0x%02x; can't map!\n", | |
476 | cmd->sc_data_direction); | |
1da177e4 LT |
477 | return 0; |
478 | } | |
479 | ||
9413d7b8 | 480 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
481 | } |
482 | ||
3d0e91f7 BK |
483 | /** |
484 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
485 | * @hostdata: the adapter | |
486 | */ | |
487 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
488 | { | |
489 | struct srp_event_struct *tmp_evt, *pos; | |
490 | unsigned long flags; | |
491 | ||
492 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
493 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { | |
494 | list_del(&tmp_evt->list); | |
495 | del_timer(&tmp_evt->timer); | |
496 | if (tmp_evt->cmnd) { | |
497 | tmp_evt->cmnd->result = (error_code << 16); | |
498 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, | |
499 | tmp_evt, | |
500 | tmp_evt->hostdata->dev); | |
501 | if (tmp_evt->cmnd_done) | |
502 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
503 | } else if (tmp_evt->done) | |
504 | tmp_evt->done(tmp_evt); | |
505 | free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); | |
506 | } | |
507 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
508 | } | |
509 | ||
510 | /** | |
511 | * ibmvscsi_reset_host - Reset the connection to the server | |
512 | * @hostdata: struct ibmvscsi_host_data to reset | |
513 | */ | |
514 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
515 | { | |
516 | scsi_block_requests(hostdata->host); | |
517 | atomic_set(&hostdata->request_limit, 0); | |
518 | ||
519 | purge_requests(hostdata, DID_ERROR); | |
d3849d51 DW |
520 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata)) || |
521 | (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0)) || | |
3d0e91f7 BK |
522 | (vio_enable_interrupts(to_vio_dev(hostdata->dev)))) { |
523 | atomic_set(&hostdata->request_limit, -1); | |
524 | dev_err(hostdata->dev, "error after reset\n"); | |
525 | } | |
526 | ||
527 | scsi_unblock_requests(hostdata->host); | |
528 | } | |
529 | ||
530 | /** | |
531 | * ibmvscsi_timeout - Internal command timeout handler | |
532 | * @evt_struct: struct srp_event_struct that timed out | |
533 | * | |
534 | * Called when an internally generated command times out | |
535 | */ | |
536 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) | |
537 | { | |
538 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
539 | ||
540 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
541 | evt_struct->iu.srp.cmd.opcode); | |
542 | ||
543 | ibmvscsi_reset_host(hostdata); | |
544 | } | |
545 | ||
546 | ||
1da177e4 LT |
547 | /* ------------------------------------------------------------ |
548 | * Routines for sending and receiving SRPs | |
549 | */ | |
550 | /** | |
551 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
552 | * @evt_struct: evt_struct to be sent | |
553 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 554 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
555 | * |
556 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
557 | * Note that this routine assumes that host_lock is held for synchronization | |
558 | */ | |
559 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
560 | struct ibmvscsi_host_data *hostdata, |
561 | unsigned long timeout) | |
1da177e4 | 562 | { |
1da177e4 | 563 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
3c887e8a | 564 | int request_status = 0; |
1da177e4 LT |
565 | int rc; |
566 | ||
a897ff2a RJ |
567 | /* If we have exhausted our request limit, just fail this request, |
568 | * unless it is for a reset or abort. | |
1da177e4 LT |
569 | * Note that there are rare cases involving driver generated requests |
570 | * (such as task management requests) that the mid layer may think we | |
571 | * can handle more requests (can_queue) when we actually can't | |
572 | */ | |
cefbda2d DB |
573 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
574 | request_status = | |
575 | atomic_dec_if_positive(&hostdata->request_limit); | |
576 | /* If request limit was -1 when we started, it is now even | |
577 | * less than that | |
578 | */ | |
579 | if (request_status < -1) | |
580 | goto send_error; | |
a897ff2a | 581 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
582 | /* If request limit was 0 when we started the adapter is in the |
583 | * process of performing a login with the server adapter, or | |
584 | * we may have run out of requests. | |
585 | */ | |
586 | else if (request_status == -1 && | |
587 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
588 | goto send_busy; | |
a897ff2a RJ |
589 | /* Abort and reset calls should make it through. |
590 | * Nothing except abort and reset should use the last two | |
591 | * slots unless we had two or less to begin with. | |
592 | */ | |
593 | else if (request_status < 2 && | |
594 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
595 | /* In the case that we have less than two requests | |
596 | * available, check the server limit as a combination | |
597 | * of the request limit and the number of requests | |
598 | * in-flight (the size of the send list). If the | |
599 | * server limit is greater than 2, return busy so | |
600 | * that the last two are reserved for reset and abort. | |
601 | */ | |
602 | int server_limit = request_status; | |
603 | struct srp_event_struct *tmp_evt; | |
604 | ||
605 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
606 | server_limit++; | |
607 | } | |
608 | ||
609 | if (server_limit > 2) | |
610 | goto send_busy; | |
611 | } | |
cefbda2d | 612 | } |
1da177e4 LT |
613 | |
614 | /* Copy the IU into the transfer area */ | |
615 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 616 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
617 | |
618 | /* Add this to the sent list. We need to do this | |
619 | * before we actually send | |
620 | * in case it comes back REALLY fast | |
621 | */ | |
622 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
623 | ||
3d0e91f7 BK |
624 | init_timer(&evt_struct->timer); |
625 | if (timeout) { | |
626 | evt_struct->timer.data = (unsigned long) evt_struct; | |
627 | evt_struct->timer.expires = jiffies + (timeout * HZ); | |
628 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; | |
629 | add_timer(&evt_struct->timer); | |
630 | } | |
631 | ||
1da177e4 | 632 | if ((rc = |
d3849d51 | 633 | ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
1da177e4 | 634 | list_del(&evt_struct->list); |
3d0e91f7 | 635 | del_timer(&evt_struct->timer); |
1da177e4 | 636 | |
860784c8 RJ |
637 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
638 | * Firmware will send a CRQ with a transport event (0xFF) to | |
639 | * tell this client what has happened to the transport. This | |
640 | * will be handled in ibmvscsi_handle_crq() | |
641 | */ | |
642 | if (rc == H_CLOSED) { | |
643 | dev_warn(hostdata->dev, "send warning. " | |
644 | "Receive queue closed, will retry.\n"); | |
645 | goto send_busy; | |
646 | } | |
6c0a60ec | 647 | dev_err(hostdata->dev, "send error %d\n", rc); |
a897ff2a | 648 | atomic_inc(&hostdata->request_limit); |
1da177e4 LT |
649 | goto send_error; |
650 | } | |
651 | ||
652 | return 0; | |
653 | ||
cefbda2d | 654 | send_busy: |
4dddbc26 | 655 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 656 | |
1da177e4 | 657 | free_event_struct(&hostdata->pool, evt_struct); |
3c887e8a RJ |
658 | if (request_status != -1) |
659 | atomic_inc(&hostdata->request_limit); | |
a897ff2a | 660 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
661 | |
662 | send_error: | |
663 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
664 | ||
665 | if (evt_struct->cmnd != NULL) { | |
666 | evt_struct->cmnd->result = DID_ERROR << 16; | |
667 | evt_struct->cmnd_done(evt_struct->cmnd); | |
668 | } else if (evt_struct->done) | |
669 | evt_struct->done(evt_struct); | |
670 | ||
671 | free_event_struct(&hostdata->pool, evt_struct); | |
672 | return 0; | |
1da177e4 LT |
673 | } |
674 | ||
675 | /** | |
676 | * handle_cmd_rsp: - Handle responses from commands | |
677 | * @evt_struct: srp_event_struct to be handled | |
678 | * | |
679 | * Used as a callback by when sending scsi cmds. | |
680 | * Gets called by ibmvscsi_handle_crq() | |
681 | */ | |
682 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
683 | { | |
684 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
685 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
686 | ||
ef265673 | 687 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 688 | if (printk_ratelimit()) |
6c0a60ec BK |
689 | dev_warn(evt_struct->hostdata->dev, |
690 | "bad SRP RSP type %d\n", rsp->opcode); | |
1da177e4 LT |
691 | } |
692 | ||
693 | if (cmnd) { | |
c3a3b55a | 694 | cmnd->result |= rsp->status; |
1da177e4 LT |
695 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
696 | memcpy(cmnd->sense_buffer, | |
ef265673 FT |
697 | rsp->data, |
698 | rsp->sense_data_len); | |
1da177e4 | 699 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 700 | evt_struct, |
1da177e4 LT |
701 | evt_struct->hostdata->dev); |
702 | ||
ef265673 | 703 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
9413d7b8 | 704 | scsi_set_resid(cmnd, rsp->data_out_res_cnt); |
ef265673 | 705 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
9413d7b8 | 706 | scsi_set_resid(cmnd, rsp->data_in_res_cnt); |
1da177e4 LT |
707 | } |
708 | ||
709 | if (evt_struct->cmnd_done) | |
710 | evt_struct->cmnd_done(cmnd); | |
711 | } | |
712 | ||
713 | /** | |
714 | * lun_from_dev: - Returns the lun of the scsi device | |
715 | * @dev: struct scsi_device | |
716 | * | |
717 | */ | |
718 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
719 | { | |
720 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
721 | } | |
722 | ||
723 | /** | |
724 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
725 | * @cmd: struct scsi_cmnd to be executed | |
726 | * @done: Callback function to be called when cmd is completed | |
727 | */ | |
728 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, | |
729 | void (*done) (struct scsi_cmnd *)) | |
730 | { | |
731 | struct srp_cmd *srp_cmd; | |
732 | struct srp_event_struct *evt_struct; | |
ef265673 | 733 | struct srp_indirect_buf *indirect; |
7603e02e | 734 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 735 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 736 | u8 out_fmt, in_fmt; |
1da177e4 | 737 | |
c3a3b55a | 738 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
739 | evt_struct = get_event_struct(&hostdata->pool); |
740 | if (!evt_struct) | |
741 | return SCSI_MLQUEUE_HOST_BUSY; | |
742 | ||
1da177e4 LT |
743 | /* Set up the actual SRP IU */ |
744 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
745 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
746 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 747 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
1da177e4 LT |
748 | srp_cmd->lun = ((u64) lun) << 48; |
749 | ||
4dddbc26 | 750 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
751 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
752 | sdev_printk(KERN_ERR, cmnd->device, | |
753 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
754 | free_event_struct(&hostdata->pool, evt_struct); |
755 | return SCSI_MLQUEUE_HOST_BUSY; | |
756 | } | |
757 | ||
4dddbc26 JB |
758 | init_event_struct(evt_struct, |
759 | handle_cmd_rsp, | |
760 | VIOSRP_SRP_FORMAT, | |
242f9dcb | 761 | cmnd->request->timeout/HZ); |
4dddbc26 JB |
762 | |
763 | evt_struct->cmnd = cmnd; | |
764 | evt_struct->cmnd_done = done; | |
765 | ||
1da177e4 | 766 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
767 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
768 | out_fmt = srp_cmd->buf_fmt >> 4; | |
769 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
770 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
771 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
772 | indirect->table_desc.va == 0) { | |
773 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + | |
774 | offsetof(struct srp_cmd, add_data) + | |
775 | offsetof(struct srp_indirect_buf, desc_list); | |
1da177e4 LT |
776 | } |
777 | ||
3d0e91f7 | 778 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
779 | } |
780 | ||
781 | /* ------------------------------------------------------------ | |
782 | * Routines for driver initialization | |
783 | */ | |
784 | /** | |
785 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
786 | * @evt_struct: srp_event_struct with the response | |
787 | * | |
788 | * Used as a "done" callback by when sending adapter_info. Gets called | |
789 | * by ibmvscsi_handle_crq() | |
790 | */ | |
791 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
792 | { | |
793 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
794 | dma_unmap_single(hostdata->dev, | |
795 | evt_struct->iu.mad.adapter_info.buffer, | |
796 | evt_struct->iu.mad.adapter_info.common.length, | |
797 | DMA_BIDIRECTIONAL); | |
798 | ||
799 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
800 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
801 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 802 | } else { |
6c0a60ec BK |
803 | dev_info(hostdata->dev, "host srp version: %s, " |
804 | "host partition %s (%d), OS %d, max io %u\n", | |
805 | hostdata->madapter_info.srp_version, | |
806 | hostdata->madapter_info.partition_name, | |
807 | hostdata->madapter_info.partition_number, | |
808 | hostdata->madapter_info.os_type, | |
809 | hostdata->madapter_info.port_max_txu[0]); | |
1da177e4 LT |
810 | |
811 | if (hostdata->madapter_info.port_max_txu[0]) | |
812 | hostdata->host->max_sectors = | |
813 | hostdata->madapter_info.port_max_txu[0] >> 9; | |
154fb614 DB |
814 | |
815 | if (hostdata->madapter_info.os_type == 3 && | |
816 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { | |
6c0a60ec BK |
817 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
818 | hostdata->madapter_info.srp_version); | |
819 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
820 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
821 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
822 | } | |
1da177e4 LT |
823 | } |
824 | } | |
825 | ||
826 | /** | |
827 | * send_mad_adapter_info: - Sends the mad adapter info request | |
828 | * and stores the result so it can be retrieved with | |
829 | * sysfs. We COULD consider causing a failure if the | |
830 | * returned SRP version doesn't match ours. | |
831 | * @hostdata: ibmvscsi_host_data of host | |
832 | * | |
833 | * Returns zero if successful. | |
834 | */ | |
835 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
836 | { | |
837 | struct viosrp_adapter_info *req; | |
838 | struct srp_event_struct *evt_struct; | |
06f923cb | 839 | unsigned long flags; |
e5dbfa66 FT |
840 | dma_addr_t addr; |
841 | ||
1da177e4 LT |
842 | evt_struct = get_event_struct(&hostdata->pool); |
843 | if (!evt_struct) { | |
6c0a60ec BK |
844 | dev_err(hostdata->dev, |
845 | "couldn't allocate an event for ADAPTER_INFO_REQ!\n"); | |
1da177e4 LT |
846 | return; |
847 | } | |
848 | ||
849 | init_event_struct(evt_struct, | |
850 | adapter_info_rsp, | |
851 | VIOSRP_MAD_FORMAT, | |
33874a00 | 852 | init_timeout); |
1da177e4 LT |
853 | |
854 | req = &evt_struct->iu.mad.adapter_info; | |
855 | memset(req, 0x00, sizeof(*req)); | |
856 | ||
857 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; | |
858 | req->common.length = sizeof(hostdata->madapter_info); | |
e5dbfa66 FT |
859 | req->buffer = addr = dma_map_single(hostdata->dev, |
860 | &hostdata->madapter_info, | |
861 | sizeof(hostdata->madapter_info), | |
862 | DMA_BIDIRECTIONAL); | |
1da177e4 | 863 | |
8d8bb39b | 864 | if (dma_mapping_error(hostdata->dev, req->buffer)) { |
7912a0ac RJ |
865 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
866 | dev_err(hostdata->dev, | |
867 | "Unable to map request_buffer for " | |
868 | "adapter_info!\n"); | |
1da177e4 LT |
869 | free_event_struct(&hostdata->pool, evt_struct); |
870 | return; | |
871 | } | |
872 | ||
06f923cb | 873 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
3d0e91f7 | 874 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2)) { |
6c0a60ec | 875 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
e5dbfa66 FT |
876 | dma_unmap_single(hostdata->dev, |
877 | addr, | |
878 | sizeof(hostdata->madapter_info), | |
879 | DMA_BIDIRECTIONAL); | |
880 | } | |
06f923cb | 881 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
882 | }; |
883 | ||
884 | /** | |
885 | * login_rsp: - Handle response to SRP login request | |
886 | * @evt_struct: srp_event_struct with the response | |
887 | * | |
888 | * Used as a "done" callback by when sending srp_login. Gets called | |
889 | * by ibmvscsi_handle_crq() | |
890 | */ | |
891 | static void login_rsp(struct srp_event_struct *evt_struct) | |
892 | { | |
893 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
ef265673 FT |
894 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { |
895 | case SRP_LOGIN_RSP: /* it worked! */ | |
1da177e4 | 896 | break; |
ef265673 | 897 | case SRP_LOGIN_REJ: /* refused! */ |
6c0a60ec BK |
898 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", |
899 | evt_struct->xfer_iu->srp.login_rej.reason); | |
1da177e4 LT |
900 | /* Login failed. */ |
901 | atomic_set(&hostdata->request_limit, -1); | |
902 | return; | |
903 | default: | |
6c0a60ec BK |
904 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", |
905 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
1da177e4 LT |
906 | /* Login failed. */ |
907 | atomic_set(&hostdata->request_limit, -1); | |
908 | return; | |
909 | } | |
910 | ||
6c0a60ec | 911 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); |
1da177e4 | 912 | |
a897ff2a | 913 | if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta < 0) |
6c0a60ec | 914 | dev_err(hostdata->dev, "Invalid request_limit.\n"); |
1da177e4 | 915 | |
a897ff2a RJ |
916 | /* Now we know what the real request-limit is. |
917 | * This value is set rather than added to request_limit because | |
918 | * request_limit could have been set to -1 by this client. | |
919 | */ | |
1da177e4 | 920 | atomic_set(&hostdata->request_limit, |
ef265673 | 921 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); |
1da177e4 | 922 | |
2b541f8f DB |
923 | /* If we had any pending I/Os, kick them */ |
924 | scsi_unblock_requests(hostdata->host); | |
925 | ||
1da177e4 LT |
926 | send_mad_adapter_info(hostdata); |
927 | return; | |
928 | } | |
929 | ||
930 | /** | |
931 | * send_srp_login: - Sends the srp login | |
932 | * @hostdata: ibmvscsi_host_data of host | |
933 | * | |
934 | * Returns zero if successful. | |
935 | */ | |
936 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
937 | { | |
938 | int rc; | |
939 | unsigned long flags; | |
940 | struct srp_login_req *login; | |
941 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
942 | if (!evt_struct) { | |
6c0a60ec | 943 | dev_err(hostdata->dev, "couldn't allocate an event for login req!\n"); |
1da177e4 LT |
944 | return FAILED; |
945 | } | |
946 | ||
947 | init_event_struct(evt_struct, | |
948 | login_rsp, | |
949 | VIOSRP_SRP_FORMAT, | |
33874a00 | 950 | init_timeout); |
1da177e4 LT |
951 | |
952 | login = &evt_struct->iu.srp.login_req; | |
2b541f8f | 953 | memset(login, 0x00, sizeof(struct srp_login_req)); |
ef265673 FT |
954 | login->opcode = SRP_LOGIN_REQ; |
955 | login->req_it_iu_len = sizeof(union srp_iu); | |
956 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; | |
1da177e4 | 957 | |
9b833e42 | 958 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
3c887e8a RJ |
959 | /* Start out with a request limit of 0, since this is negotiated in |
960 | * the login request we are just sending and login requests always | |
961 | * get sent by the driver regardless of request_limit. | |
1da177e4 | 962 | */ |
3c887e8a | 963 | atomic_set(&hostdata->request_limit, 0); |
1da177e4 | 964 | |
3d0e91f7 | 965 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2); |
1da177e4 | 966 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
6c0a60ec | 967 | dev_info(hostdata->dev, "sent SRP login\n"); |
1da177e4 LT |
968 | return rc; |
969 | }; | |
970 | ||
971 | /** | |
972 | * sync_completion: Signal that a synchronous command has completed | |
973 | * Note that after returning from this call, the evt_struct is freed. | |
974 | * the caller waiting on this completion shouldn't touch the evt_struct | |
975 | * again. | |
976 | */ | |
977 | static void sync_completion(struct srp_event_struct *evt_struct) | |
978 | { | |
979 | /* copy the response back */ | |
980 | if (evt_struct->sync_srp) | |
981 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
982 | ||
983 | complete(&evt_struct->comp); | |
984 | } | |
985 | ||
986 | /** | |
987 | * ibmvscsi_abort: Abort a command...from scsi host template | |
988 | * send this over to the server and wait synchronously for the response | |
989 | */ | |
990 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
991 | { | |
7603e02e | 992 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
993 | struct srp_tsk_mgmt *tsk_mgmt; |
994 | struct srp_event_struct *evt; | |
995 | struct srp_event_struct *tmp_evt, *found_evt; | |
996 | union viosrp_iu srp_rsp; | |
997 | int rsp_rc; | |
be042f24 | 998 | unsigned long flags; |
1da177e4 | 999 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1000 | unsigned long wait_switch = 0; |
1da177e4 LT |
1001 | |
1002 | /* First, find this command in our sent list so we can figure | |
1003 | * out the correct tag | |
1004 | */ | |
be042f24 | 1005 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1006 | wait_switch = jiffies + (init_timeout * HZ); |
1007 | do { | |
1008 | found_evt = NULL; | |
1009 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1010 | if (tmp_evt->cmnd == cmd) { | |
1011 | found_evt = tmp_evt; | |
1012 | break; | |
1013 | } | |
1da177e4 | 1014 | } |
1da177e4 | 1015 | |
860784c8 RJ |
1016 | if (!found_evt) { |
1017 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1018 | return SUCCESS; | |
1019 | } | |
1da177e4 | 1020 | |
860784c8 RJ |
1021 | evt = get_event_struct(&hostdata->pool); |
1022 | if (evt == NULL) { | |
1023 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1024 | sdev_printk(KERN_ERR, cmd->device, | |
1025 | "failed to allocate abort event\n"); | |
1026 | return FAILED; | |
1027 | } | |
1da177e4 | 1028 | |
860784c8 RJ |
1029 | init_event_struct(evt, |
1030 | sync_completion, | |
1031 | VIOSRP_SRP_FORMAT, | |
1032 | init_timeout); | |
1da177e4 | 1033 | |
860784c8 | 1034 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1035 | |
860784c8 RJ |
1036 | /* Set up an abort SRP command */ |
1037 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1038 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1039 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1040 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; | |
1041 | tsk_mgmt->task_tag = (u64) found_evt; | |
1042 | ||
1043 | evt->sync_srp = &srp_rsp; | |
1044 | ||
1045 | init_completion(&evt->comp); | |
1046 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2); | |
1047 | ||
1048 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1049 | break; | |
1050 | ||
1051 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1052 | msleep(10); | |
1053 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1054 | } while (time_before(jiffies, wait_switch)); | |
1055 | ||
be042f24 | 1056 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1057 | |
be042f24 | 1058 | if (rsp_rc != 0) { |
6c0a60ec BK |
1059 | sdev_printk(KERN_ERR, cmd->device, |
1060 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1061 | return FAILED; |
1062 | } | |
1063 | ||
860784c8 | 1064 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1065 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1066 | (((u64) lun) << 48), (u64) found_evt); |
1067 | ||
1da177e4 | 1068 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1069 | |
1070 | /* make sure we got a good response */ | |
ef265673 | 1071 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1072 | if (printk_ratelimit()) |
6c0a60ec BK |
1073 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1074 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1075 | return FAILED; |
1076 | } | |
1077 | ||
ef265673 FT |
1078 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1079 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1080 | else |
1081 | rsp_rc = srp_rsp.srp.rsp.status; | |
1082 | ||
1083 | if (rsp_rc) { | |
1084 | if (printk_ratelimit()) | |
6c0a60ec | 1085 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1086 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1087 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1088 | return FAILED; |
1089 | } | |
1090 | ||
1091 | /* Because we dropped the spinlock above, it's possible | |
1092 | * The event is no longer in our list. Make sure it didn't | |
1093 | * complete while we were aborting | |
1094 | */ | |
be042f24 | 1095 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1096 | found_evt = NULL; |
1097 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1098 | if (tmp_evt->cmnd == cmd) { | |
1099 | found_evt = tmp_evt; | |
1100 | break; | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | if (found_evt == NULL) { | |
be042f24 | 1105 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1106 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1107 | tsk_mgmt->task_tag); |
1da177e4 LT |
1108 | return SUCCESS; |
1109 | } | |
1110 | ||
fe333321 | 1111 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1112 | tsk_mgmt->task_tag); |
1da177e4 LT |
1113 | |
1114 | cmd->result = (DID_ABORT << 16); | |
1115 | list_del(&found_evt->list); | |
4dddbc26 JB |
1116 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1117 | found_evt->hostdata->dev); | |
1da177e4 | 1118 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1119 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1120 | atomic_inc(&hostdata->request_limit); |
1121 | return SUCCESS; | |
1122 | } | |
1123 | ||
1124 | /** | |
1125 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1126 | * template send this over to the server and wait synchronously for the | |
1127 | * response | |
1128 | */ | |
1129 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1130 | { | |
7603e02e | 1131 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1132 | struct srp_tsk_mgmt *tsk_mgmt; |
1133 | struct srp_event_struct *evt; | |
1134 | struct srp_event_struct *tmp_evt, *pos; | |
1135 | union viosrp_iu srp_rsp; | |
1136 | int rsp_rc; | |
be042f24 | 1137 | unsigned long flags; |
1da177e4 | 1138 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1139 | unsigned long wait_switch = 0; |
1da177e4 | 1140 | |
be042f24 | 1141 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1142 | wait_switch = jiffies + (init_timeout * HZ); |
1143 | do { | |
1144 | evt = get_event_struct(&hostdata->pool); | |
1145 | if (evt == NULL) { | |
1146 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1147 | sdev_printk(KERN_ERR, cmd->device, | |
1148 | "failed to allocate reset event\n"); | |
1149 | return FAILED; | |
1150 | } | |
1da177e4 | 1151 | |
860784c8 RJ |
1152 | init_event_struct(evt, |
1153 | sync_completion, | |
1154 | VIOSRP_SRP_FORMAT, | |
1155 | init_timeout); | |
1da177e4 | 1156 | |
860784c8 | 1157 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1158 | |
860784c8 RJ |
1159 | /* Set up a lun reset SRP command */ |
1160 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1161 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1162 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1163 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; | |
1da177e4 | 1164 | |
860784c8 RJ |
1165 | evt->sync_srp = &srp_rsp; |
1166 | ||
1167 | init_completion(&evt->comp); | |
1168 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2); | |
1169 | ||
1170 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1171 | break; | |
1172 | ||
1173 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1174 | msleep(10); | |
1175 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1176 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1177 | |
be042f24 | 1178 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1179 | |
be042f24 | 1180 | if (rsp_rc != 0) { |
6c0a60ec BK |
1181 | sdev_printk(KERN_ERR, cmd->device, |
1182 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1183 | return FAILED; |
1184 | } | |
1185 | ||
fe333321 | 1186 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1187 | (((u64) lun) << 48)); |
1188 | ||
1da177e4 | 1189 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1190 | |
1191 | /* make sure we got a good response */ | |
ef265673 | 1192 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1193 | if (printk_ratelimit()) |
6c0a60ec BK |
1194 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1195 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1196 | return FAILED; |
1197 | } | |
1198 | ||
ef265673 FT |
1199 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1200 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1201 | else |
1202 | rsp_rc = srp_rsp.srp.rsp.status; | |
1203 | ||
1204 | if (rsp_rc) { | |
1205 | if (printk_ratelimit()) | |
6c0a60ec | 1206 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1207 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1208 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1209 | return FAILED; |
1210 | } | |
1211 | ||
1212 | /* We need to find all commands for this LUN that have not yet been | |
1213 | * responded to, and fail them with DID_RESET | |
1214 | */ | |
be042f24 | 1215 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1216 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1217 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1218 | if (tmp_evt->cmnd) | |
1219 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1220 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1221 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1222 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1223 | free_event_struct(&tmp_evt->hostdata->pool, |
1224 | tmp_evt); | |
1225 | atomic_inc(&hostdata->request_limit); | |
1226 | if (tmp_evt->cmnd_done) | |
1227 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1228 | else if (tmp_evt->done) | |
1229 | tmp_evt->done(tmp_evt); | |
1230 | } | |
1231 | } | |
be042f24 | 1232 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1233 | return SUCCESS; |
1234 | } | |
1235 | ||
1236 | /** | |
3d0e91f7 BK |
1237 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1238 | * @cmd: struct scsi_cmnd having problems | |
1239 | */ | |
1240 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1241 | { |
3d0e91f7 | 1242 | unsigned long wait_switch = 0; |
7603e02e | 1243 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1244 | |
3d0e91f7 BK |
1245 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1246 | ||
1247 | ibmvscsi_reset_host(hostdata); | |
1248 | ||
1249 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1250 | time_before(jiffies, wait_switch) && | |
1251 | atomic_read(&hostdata->request_limit) < 2;) { | |
1252 | ||
1253 | msleep(10); | |
1da177e4 | 1254 | } |
3d0e91f7 BK |
1255 | |
1256 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1257 | return FAILED; | |
1258 | ||
1259 | return SUCCESS; | |
1da177e4 LT |
1260 | } |
1261 | ||
1262 | /** | |
1263 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1264 | * @crq: Command/Response queue | |
1265 | * @hostdata: ibmvscsi_host_data of host | |
1266 | * | |
1267 | */ | |
1268 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, | |
1269 | struct ibmvscsi_host_data *hostdata) | |
1270 | { | |
6c0a60ec | 1271 | long rc; |
1da177e4 LT |
1272 | unsigned long flags; |
1273 | struct srp_event_struct *evt_struct = | |
1274 | (struct srp_event_struct *)crq->IU_data_ptr; | |
1275 | switch (crq->valid) { | |
1276 | case 0xC0: /* initialization */ | |
1277 | switch (crq->format) { | |
1278 | case 0x01: /* Initialization message */ | |
6c0a60ec | 1279 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1280 | /* Send back a response */ |
d3849d51 DW |
1281 | if ((rc = ibmvscsi_ops->send_crq(hostdata, |
1282 | 0xC002000000000000LL, 0)) == 0) { | |
1da177e4 LT |
1283 | /* Now login */ |
1284 | send_srp_login(hostdata); | |
1285 | } else { | |
6c0a60ec | 1286 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1287 | } |
1288 | ||
1289 | break; | |
1290 | case 0x02: /* Initialization response */ | |
6c0a60ec | 1291 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1292 | |
1293 | /* Now login */ | |
1294 | send_srp_login(hostdata); | |
1295 | break; | |
1296 | default: | |
6c0a60ec | 1297 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1298 | } |
1299 | return; | |
2b541f8f DB |
1300 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
1301 | scsi_block_requests(hostdata->host); | |
cefbda2d | 1302 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1303 | if (crq->format == 0x06) { |
1304 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1305 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
2b541f8f | 1306 | purge_requests(hostdata, DID_REQUEUE); |
d3849d51 DW |
1307 | if ((ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, |
1308 | hostdata)) || | |
1309 | (ibmvscsi_ops->send_crq(hostdata, | |
1310 | 0xC001000000000000LL, 0))) { | |
cefbda2d DB |
1311 | atomic_set(&hostdata->request_limit, |
1312 | -1); | |
6c0a60ec | 1313 | dev_err(hostdata->dev, "error after enable\n"); |
cefbda2d | 1314 | } |
2b541f8f | 1315 | } else { |
6c0a60ec BK |
1316 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1317 | crq->format); | |
1da177e4 | 1318 | |
2b541f8f | 1319 | purge_requests(hostdata, DID_ERROR); |
d3849d51 DW |
1320 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, |
1321 | hostdata)) || | |
1322 | (ibmvscsi_ops->send_crq(hostdata, | |
1323 | 0xC001000000000000LL, 0))) { | |
cefbda2d DB |
1324 | atomic_set(&hostdata->request_limit, |
1325 | -1); | |
6c0a60ec | 1326 | dev_err(hostdata->dev, "error after reset\n"); |
cefbda2d | 1327 | } |
2b541f8f DB |
1328 | } |
1329 | scsi_unblock_requests(hostdata->host); | |
1da177e4 LT |
1330 | return; |
1331 | case 0x80: /* real payload */ | |
1332 | break; | |
1333 | default: | |
6c0a60ec BK |
1334 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1335 | crq->valid); | |
1da177e4 LT |
1336 | return; |
1337 | } | |
1338 | ||
1339 | /* The only kind of payload CRQs we should get are responses to | |
1340 | * things we send. Make sure this response is to something we | |
1341 | * actually sent | |
1342 | */ | |
1343 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1344 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
1da177e4 LT |
1345 | (void *)crq->IU_data_ptr); |
1346 | return; | |
1347 | } | |
1348 | ||
1349 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec BK |
1350 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
1351 | (void *)crq->IU_data_ptr); | |
1da177e4 LT |
1352 | return; |
1353 | } | |
1354 | ||
1355 | if (crq->format == VIOSRP_SRP_FORMAT) | |
ef265673 | 1356 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
1da177e4 LT |
1357 | &hostdata->request_limit); |
1358 | ||
3d0e91f7 BK |
1359 | del_timer(&evt_struct->timer); |
1360 | ||
ca61668b | 1361 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1362 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1363 | if (evt_struct->done) |
1364 | evt_struct->done(evt_struct); | |
1365 | else | |
6c0a60ec | 1366 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1367 | |
1368 | /* | |
1369 | * Lock the host_lock before messing with these structures, since we | |
1370 | * are running in a task context | |
1371 | */ | |
1372 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1373 | list_del(&evt_struct->list); | |
1374 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1375 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1376 | } | |
1377 | ||
1378 | /** | |
1379 | * ibmvscsi_get_host_config: Send the command to the server to get host | |
1380 | * configuration data. The data is opaque to us. | |
1381 | */ | |
1382 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, | |
1383 | unsigned char *buffer, int length) | |
1384 | { | |
1385 | struct viosrp_host_config *host_config; | |
1386 | struct srp_event_struct *evt_struct; | |
06f923cb | 1387 | unsigned long flags; |
e5dbfa66 | 1388 | dma_addr_t addr; |
1da177e4 LT |
1389 | int rc; |
1390 | ||
1391 | evt_struct = get_event_struct(&hostdata->pool); | |
1392 | if (!evt_struct) { | |
6c0a60ec | 1393 | dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n"); |
1da177e4 LT |
1394 | return -1; |
1395 | } | |
1396 | ||
1397 | init_event_struct(evt_struct, | |
1398 | sync_completion, | |
1399 | VIOSRP_MAD_FORMAT, | |
33874a00 | 1400 | init_timeout); |
1da177e4 LT |
1401 | |
1402 | host_config = &evt_struct->iu.mad.host_config; | |
1403 | ||
1404 | /* Set up a lun reset SRP command */ | |
1405 | memset(host_config, 0x00, sizeof(*host_config)); | |
1406 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; | |
1407 | host_config->common.length = length; | |
e5dbfa66 FT |
1408 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
1409 | length, | |
1410 | DMA_BIDIRECTIONAL); | |
1da177e4 | 1411 | |
8d8bb39b | 1412 | if (dma_mapping_error(hostdata->dev, host_config->buffer)) { |
7912a0ac RJ |
1413 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1414 | dev_err(hostdata->dev, | |
1415 | "dma_mapping error getting host config\n"); | |
1da177e4 LT |
1416 | free_event_struct(&hostdata->pool, evt_struct); |
1417 | return -1; | |
1418 | } | |
1419 | ||
1420 | init_completion(&evt_struct->comp); | |
06f923cb | 1421 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
3d0e91f7 | 1422 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2); |
06f923cb | 1423 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
e5dbfa66 | 1424 | if (rc == 0) |
1da177e4 | 1425 | wait_for_completion(&evt_struct->comp); |
e5dbfa66 | 1426 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
1da177e4 LT |
1427 | |
1428 | return rc; | |
1429 | } | |
1430 | ||
0979c84b RJ |
1431 | /** |
1432 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1433 | * @sdev: struct scsi_device device to configure | |
1434 | * | |
1435 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1436 | * queue_depth here also as is required by the documentation for | |
1437 | * struct scsi_host_template. | |
1438 | */ | |
1439 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1440 | { | |
1441 | struct Scsi_Host *shost = sdev->host; | |
1442 | unsigned long lock_flags = 0; | |
1443 | ||
1444 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1445 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1446 | sdev->allow_restart = 1; |
97b5648a | 1447 | blk_queue_rq_timeout(sdev->request_queue, 60 * HZ); |
d1a357fc | 1448 | } |
0979c84b RJ |
1449 | scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); |
1450 | spin_unlock_irqrestore(shost->host_lock, lock_flags); | |
1451 | return 0; | |
1452 | } | |
1453 | ||
742d25b8 BK |
1454 | /** |
1455 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1456 | * @sdev: scsi device struct | |
1457 | * @qdepth: depth to set | |
1458 | * | |
1459 | * Return value: | |
1460 | * actual depth set | |
1461 | **/ | |
1462 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) | |
1463 | { | |
1464 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) | |
1465 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
1466 | ||
1467 | scsi_adjust_queue_depth(sdev, 0, qdepth); | |
1468 | return sdev->queue_depth; | |
1469 | } | |
1470 | ||
1da177e4 LT |
1471 | /* ------------------------------------------------------------ |
1472 | * sysfs attributes | |
1473 | */ | |
ee959b00 TJ |
1474 | static ssize_t show_host_srp_version(struct device *dev, |
1475 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1476 | { |
ee959b00 | 1477 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1478 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1479 | int len; |
1480 | ||
1481 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1482 | hostdata->madapter_info.srp_version); | |
1483 | return len; | |
1484 | } | |
1485 | ||
ee959b00 | 1486 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1487 | .attr = { |
1488 | .name = "srp_version", | |
1489 | .mode = S_IRUGO, | |
1490 | }, | |
1491 | .show = show_host_srp_version, | |
1492 | }; | |
1493 | ||
ee959b00 TJ |
1494 | static ssize_t show_host_partition_name(struct device *dev, |
1495 | struct device_attribute *attr, | |
1da177e4 LT |
1496 | char *buf) |
1497 | { | |
ee959b00 | 1498 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1499 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1500 | int len; |
1501 | ||
1502 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1503 | hostdata->madapter_info.partition_name); | |
1504 | return len; | |
1505 | } | |
1506 | ||
ee959b00 | 1507 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
1508 | .attr = { |
1509 | .name = "partition_name", | |
1510 | .mode = S_IRUGO, | |
1511 | }, | |
1512 | .show = show_host_partition_name, | |
1513 | }; | |
1514 | ||
ee959b00 TJ |
1515 | static ssize_t show_host_partition_number(struct device *dev, |
1516 | struct device_attribute *attr, | |
1da177e4 LT |
1517 | char *buf) |
1518 | { | |
ee959b00 | 1519 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1520 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1521 | int len; |
1522 | ||
1523 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1524 | hostdata->madapter_info.partition_number); | |
1525 | return len; | |
1526 | } | |
1527 | ||
ee959b00 | 1528 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
1529 | .attr = { |
1530 | .name = "partition_number", | |
1531 | .mode = S_IRUGO, | |
1532 | }, | |
1533 | .show = show_host_partition_number, | |
1534 | }; | |
1535 | ||
ee959b00 TJ |
1536 | static ssize_t show_host_mad_version(struct device *dev, |
1537 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1538 | { |
ee959b00 | 1539 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1540 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1541 | int len; |
1542 | ||
1543 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1544 | hostdata->madapter_info.mad_version); | |
1545 | return len; | |
1546 | } | |
1547 | ||
ee959b00 | 1548 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
1549 | .attr = { |
1550 | .name = "mad_version", | |
1551 | .mode = S_IRUGO, | |
1552 | }, | |
1553 | .show = show_host_mad_version, | |
1554 | }; | |
1555 | ||
ee959b00 TJ |
1556 | static ssize_t show_host_os_type(struct device *dev, |
1557 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1558 | { |
ee959b00 | 1559 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1560 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1561 | int len; |
1562 | ||
1563 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); | |
1564 | return len; | |
1565 | } | |
1566 | ||
ee959b00 | 1567 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
1568 | .attr = { |
1569 | .name = "os_type", | |
1570 | .mode = S_IRUGO, | |
1571 | }, | |
1572 | .show = show_host_os_type, | |
1573 | }; | |
1574 | ||
ee959b00 TJ |
1575 | static ssize_t show_host_config(struct device *dev, |
1576 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1577 | { |
ee959b00 | 1578 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1579 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1580 | |
1581 | /* returns null-terminated host config data */ | |
1582 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) | |
1583 | return strlen(buf); | |
1584 | else | |
1585 | return 0; | |
1586 | } | |
1587 | ||
ee959b00 | 1588 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 LT |
1589 | .attr = { |
1590 | .name = "config", | |
1591 | .mode = S_IRUGO, | |
1592 | }, | |
1593 | .show = show_host_config, | |
1594 | }; | |
1595 | ||
ee959b00 | 1596 | static struct device_attribute *ibmvscsi_attrs[] = { |
1da177e4 LT |
1597 | &ibmvscsi_host_srp_version, |
1598 | &ibmvscsi_host_partition_name, | |
1599 | &ibmvscsi_host_partition_number, | |
1600 | &ibmvscsi_host_mad_version, | |
1601 | &ibmvscsi_host_os_type, | |
1602 | &ibmvscsi_host_config, | |
1603 | NULL | |
1604 | }; | |
1605 | ||
1606 | /* ------------------------------------------------------------ | |
1607 | * SCSI driver registration | |
1608 | */ | |
1609 | static struct scsi_host_template driver_template = { | |
1610 | .module = THIS_MODULE, | |
1611 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
1612 | .proc_name = "ibmvscsi", | |
1613 | .queuecommand = ibmvscsi_queuecommand, | |
1614 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
1615 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 1616 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 1617 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 1618 | .change_queue_depth = ibmvscsi_change_queue_depth, |
7912a0ac | 1619 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 1620 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 1621 | .this_id = -1, |
4dddbc26 | 1622 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
1623 | .use_clustering = ENABLE_CLUSTERING, |
1624 | .shost_attrs = ibmvscsi_attrs, | |
1625 | }; | |
1626 | ||
7912a0ac RJ |
1627 | /** |
1628 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
1629 | * | |
1630 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
1631 | * | |
1632 | * Return value: | |
1633 | * Number of bytes of IO data the driver will need to perform well. | |
1634 | */ | |
1635 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
1636 | { | |
1637 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 1638 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
1639 | |
1640 | /* add io space for sg data */ | |
004dd5e8 | 1641 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
1642 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
1643 | ||
1644 | return desired_io; | |
1645 | } | |
1646 | ||
1da177e4 LT |
1647 | /** |
1648 | * Called by bus code for each adapter | |
1649 | */ | |
1650 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
1651 | { | |
1652 | struct ibmvscsi_host_data *hostdata; | |
1653 | struct Scsi_Host *host; | |
1654 | struct device *dev = &vdev->dev; | |
4d680419 FT |
1655 | struct srp_rport_identifiers ids; |
1656 | struct srp_rport *rport; | |
1da177e4 | 1657 | unsigned long wait_switch = 0; |
cefbda2d | 1658 | int rc; |
1da177e4 LT |
1659 | |
1660 | vdev->dev.driver_data = NULL; | |
1661 | ||
1662 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
1663 | if (!host) { | |
6c0a60ec | 1664 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
1665 | goto scsi_host_alloc_failed; |
1666 | } | |
1667 | ||
4d680419 | 1668 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 1669 | hostdata = shost_priv(host); |
1da177e4 LT |
1670 | memset(hostdata, 0x00, sizeof(*hostdata)); |
1671 | INIT_LIST_HEAD(&hostdata->sent); | |
1672 | hostdata->host = host; | |
1673 | hostdata->dev = dev; | |
1674 | atomic_set(&hostdata->request_limit, -1); | |
7912a0ac | 1675 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 1676 | |
4f10aae0 | 1677 | rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 1678 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 1679 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
1da177e4 LT |
1680 | goto init_crq_failed; |
1681 | } | |
4f10aae0 | 1682 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 1683 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
1684 | goto init_pool_failed; |
1685 | } | |
1686 | ||
1687 | host->max_lun = 8; | |
1688 | host->max_id = max_id; | |
1689 | host->max_channel = max_channel; | |
1690 | ||
1691 | if (scsi_add_host(hostdata->host, hostdata->dev)) | |
1692 | goto add_host_failed; | |
1693 | ||
4d680419 FT |
1694 | /* we don't have a proper target_port_id so let's use the fake one */ |
1695 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
1696 | sizeof(ids.port_id)); | |
aebd5e47 | 1697 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
1698 | rport = srp_rport_add(host, &ids); |
1699 | if (IS_ERR(rport)) | |
1700 | goto add_srp_port_failed; | |
1701 | ||
1da177e4 LT |
1702 | /* Try to send an initialization message. Note that this is allowed |
1703 | * to fail if the other end is not acive. In that case we don't | |
1704 | * want to scan | |
1705 | */ | |
d3849d51 | 1706 | if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 1707 | || rc == H_RESOURCE) { |
1da177e4 LT |
1708 | /* |
1709 | * Wait around max init_timeout secs for the adapter to finish | |
1710 | * initializing. When we are done initializing, we will have a | |
1711 | * valid request_limit. We don't want Linux scanning before | |
1712 | * we are ready. | |
1713 | */ | |
1714 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1715 | time_before(jiffies, wait_switch) && | |
1716 | atomic_read(&hostdata->request_limit) < 2;) { | |
1717 | ||
1718 | msleep(10); | |
1719 | } | |
1720 | ||
1721 | /* if we now have a valid request_limit, initiate a scan */ | |
1722 | if (atomic_read(&hostdata->request_limit) > 0) | |
1723 | scsi_scan_host(host); | |
1724 | } | |
1725 | ||
1726 | vdev->dev.driver_data = hostdata; | |
1727 | return 0; | |
1728 | ||
4d680419 FT |
1729 | add_srp_port_failed: |
1730 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
1731 | add_host_failed: |
1732 | release_event_pool(&hostdata->pool, hostdata); | |
1733 | init_pool_failed: | |
4f10aae0 | 1734 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events); |
1da177e4 LT |
1735 | init_crq_failed: |
1736 | scsi_host_put(host); | |
1737 | scsi_host_alloc_failed: | |
1738 | return -1; | |
1739 | } | |
1740 | ||
1741 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
1742 | { | |
1743 | struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data; | |
1744 | release_event_pool(&hostdata->pool, hostdata); | |
d3849d51 | 1745 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 1746 | max_events); |
4d680419 FT |
1747 | |
1748 | srp_remove_host(hostdata->host); | |
1da177e4 LT |
1749 | scsi_remove_host(hostdata->host); |
1750 | scsi_host_put(hostdata->host); | |
1751 | ||
1752 | return 0; | |
1753 | } | |
1754 | ||
1755 | /** | |
1756 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
1757 | * support. | |
1758 | */ | |
1759 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { | |
1760 | {"vscsi", "IBM,v-scsi"}, | |
fb120da6 | 1761 | { "", "" } |
1da177e4 | 1762 | }; |
1da177e4 | 1763 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 1764 | |
1da177e4 | 1765 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
1766 | .id_table = ibmvscsi_device_table, |
1767 | .probe = ibmvscsi_probe, | |
6fdf5392 | 1768 | .remove = ibmvscsi_remove, |
7912a0ac | 1769 | .get_desired_dma = ibmvscsi_get_desired_dma, |
6fdf5392 SR |
1770 | .driver = { |
1771 | .name = "ibmvscsi", | |
915124d8 | 1772 | .owner = THIS_MODULE, |
6fdf5392 | 1773 | } |
1da177e4 LT |
1774 | }; |
1775 | ||
4d680419 FT |
1776 | static struct srp_function_template ibmvscsi_transport_functions = { |
1777 | }; | |
1778 | ||
1da177e4 LT |
1779 | int __init ibmvscsi_module_init(void) |
1780 | { | |
4d680419 FT |
1781 | int ret; |
1782 | ||
4f10aae0 BK |
1783 | /* Ensure we have two requests to do error recovery */ |
1784 | driver_template.can_queue = max_requests; | |
1785 | max_events = max_requests + 2; | |
1786 | ||
d3849d51 DW |
1787 | if (firmware_has_feature(FW_FEATURE_ISERIES)) |
1788 | ibmvscsi_ops = &iseriesvscsi_ops; | |
1789 | else if (firmware_has_feature(FW_FEATURE_VIO)) | |
1790 | ibmvscsi_ops = &rpavscsi_ops; | |
1791 | else | |
1792 | return -ENODEV; | |
1793 | ||
4d680419 FT |
1794 | ibmvscsi_transport_template = |
1795 | srp_attach_transport(&ibmvscsi_transport_functions); | |
1796 | if (!ibmvscsi_transport_template) | |
1797 | return -ENOMEM; | |
1798 | ||
1799 | ret = vio_register_driver(&ibmvscsi_driver); | |
1800 | if (ret) | |
1801 | srp_release_transport(ibmvscsi_transport_template); | |
1802 | return ret; | |
1da177e4 LT |
1803 | } |
1804 | ||
1805 | void __exit ibmvscsi_module_exit(void) | |
1806 | { | |
1807 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 1808 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
1809 | } |
1810 | ||
1811 | module_init(ibmvscsi_module_init); | |
1812 | module_exit(ibmvscsi_module_exit); |