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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> | |
73 | #include <asm/vio.h> | |
74 | #include <scsi/scsi.h> | |
75 | #include <scsi/scsi_cmnd.h> | |
76 | #include <scsi/scsi_host.h> | |
77 | #include <scsi/scsi_device.h> | |
78 | #include "ibmvscsi.h" | |
79 | ||
80 | /* The values below are somewhat arbitrary default values, but | |
81 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
82 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
83 | * 5 bits of LUN. | |
84 | */ | |
85 | static int max_id = 64; | |
86 | static int max_channel = 3; | |
87 | static int init_timeout = 5; | |
a897ff2a | 88 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
1da177e4 | 89 | |
2b541f8f | 90 | #define IBMVSCSI_VERSION "1.5.8" |
1da177e4 LT |
91 | |
92 | MODULE_DESCRIPTION("IBM Virtual SCSI"); | |
93 | MODULE_AUTHOR("Dave Boutcher"); | |
94 | MODULE_LICENSE("GPL"); | |
95 | MODULE_VERSION(IBMVSCSI_VERSION); | |
96 | ||
97 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
98 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); | |
99 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); | |
100 | MODULE_PARM_DESC(max_channel, "Largest channel value"); | |
101 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); | |
102 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
103 | module_param_named(max_requests, max_requests, int, S_IRUGO | S_IWUSR); | |
104 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); | |
105 | ||
106 | /* ------------------------------------------------------------ | |
107 | * Routines for the event pool and event structs | |
108 | */ | |
109 | /** | |
110 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
111 | * @pool: event_pool to be initialized | |
112 | * @size: Number of events in pool | |
113 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
114 | * | |
115 | * Returns zero on success. | |
116 | */ | |
117 | static int initialize_event_pool(struct event_pool *pool, | |
118 | int size, struct ibmvscsi_host_data *hostdata) | |
119 | { | |
120 | int i; | |
121 | ||
122 | pool->size = size; | |
123 | pool->next = 0; | |
4c021dd1 | 124 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
125 | if (!pool->events) |
126 | return -ENOMEM; | |
1da177e4 LT |
127 | |
128 | pool->iu_storage = | |
129 | dma_alloc_coherent(hostdata->dev, | |
130 | pool->size * sizeof(*pool->iu_storage), | |
131 | &pool->iu_token, 0); | |
132 | if (!pool->iu_storage) { | |
133 | kfree(pool->events); | |
134 | return -ENOMEM; | |
135 | } | |
136 | ||
137 | for (i = 0; i < pool->size; ++i) { | |
138 | struct srp_event_struct *evt = &pool->events[i]; | |
139 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
140 | atomic_set(&evt->free, 1); | |
141 | evt->crq.valid = 0x80; | |
142 | evt->crq.IU_length = sizeof(*evt->xfer_iu); | |
143 | evt->crq.IU_data_ptr = pool->iu_token + | |
144 | sizeof(*evt->xfer_iu) * i; | |
145 | evt->xfer_iu = pool->iu_storage + i; | |
146 | evt->hostdata = hostdata; | |
4dddbc26 JB |
147 | evt->ext_list = NULL; |
148 | evt->ext_list_token = 0; | |
1da177e4 LT |
149 | } |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | /** | |
155 | * release_event_pool: - Frees memory of an event pool of a host | |
156 | * @pool: event_pool to be released | |
157 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
158 | * | |
159 | * Returns zero on success. | |
160 | */ | |
161 | static void release_event_pool(struct event_pool *pool, | |
162 | struct ibmvscsi_host_data *hostdata) | |
163 | { | |
164 | int i, in_use = 0; | |
4dddbc26 | 165 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
166 | if (atomic_read(&pool->events[i].free) != 1) |
167 | ++in_use; | |
4dddbc26 JB |
168 | if (pool->events[i].ext_list) { |
169 | dma_free_coherent(hostdata->dev, | |
ef265673 | 170 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
171 | pool->events[i].ext_list, |
172 | pool->events[i].ext_list_token); | |
173 | } | |
174 | } | |
1da177e4 LT |
175 | if (in_use) |
176 | printk(KERN_WARNING | |
177 | "ibmvscsi: releasing event pool with %d " | |
178 | "events still in use?\n", in_use); | |
179 | kfree(pool->events); | |
180 | dma_free_coherent(hostdata->dev, | |
181 | pool->size * sizeof(*pool->iu_storage), | |
182 | pool->iu_storage, pool->iu_token); | |
183 | } | |
184 | ||
185 | /** | |
186 | * valid_event_struct: - Determines if event is valid. | |
187 | * @pool: event_pool that contains the event | |
188 | * @evt: srp_event_struct to be checked for validity | |
189 | * | |
190 | * Returns zero if event is invalid, one otherwise. | |
191 | */ | |
192 | static int valid_event_struct(struct event_pool *pool, | |
193 | struct srp_event_struct *evt) | |
194 | { | |
195 | int index = evt - pool->events; | |
196 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
197 | return 0; | |
198 | if (evt != pool->events + index) /* unaligned */ | |
199 | return 0; | |
200 | return 1; | |
201 | } | |
202 | ||
203 | /** | |
204 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
205 | * @pool: event_pool that contains the event | |
206 | * @evt: srp_event_struct to be modified | |
207 | * | |
208 | */ | |
209 | static void free_event_struct(struct event_pool *pool, | |
210 | struct srp_event_struct *evt) | |
211 | { | |
212 | if (!valid_event_struct(pool, evt)) { | |
213 | printk(KERN_ERR | |
214 | "ibmvscsi: Freeing invalid event_struct %p " | |
215 | "(not in pool %p)\n", evt, pool->events); | |
216 | return; | |
217 | } | |
218 | if (atomic_inc_return(&evt->free) != 1) { | |
219 | printk(KERN_ERR | |
220 | "ibmvscsi: Freeing event_struct %p " | |
221 | "which is not in use!\n", evt); | |
222 | return; | |
223 | } | |
224 | } | |
225 | ||
226 | /** | |
227 | * get_evt_struct: - Gets the next free event in pool | |
228 | * @pool: event_pool that contains the events to be searched | |
229 | * | |
230 | * Returns the next event in "free" state, and NULL if none are free. | |
231 | * Note that no synchronization is done here, we assume the host_lock | |
232 | * will syncrhonze things. | |
233 | */ | |
234 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
235 | { | |
236 | int i; | |
237 | int poolsize = pool->size; | |
238 | int offset = pool->next; | |
239 | ||
240 | for (i = 0; i < poolsize; i++) { | |
241 | offset = (offset + 1) % poolsize; | |
242 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
243 | pool->next = offset; | |
244 | return &pool->events[offset]; | |
245 | } | |
246 | } | |
247 | ||
248 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
249 | return NULL; | |
250 | } | |
251 | ||
252 | /** | |
253 | * init_event_struct: Initialize fields in an event struct that are always | |
254 | * required. | |
255 | * @evt: The event | |
256 | * @done: Routine to call when the event is responded to | |
257 | * @format: SRP or MAD format | |
258 | * @timeout: timeout value set in the CRQ | |
259 | */ | |
260 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
261 | void (*done) (struct srp_event_struct *), | |
262 | u8 format, | |
263 | int timeout) | |
264 | { | |
265 | evt_struct->cmnd = NULL; | |
266 | evt_struct->cmnd_done = NULL; | |
267 | evt_struct->sync_srp = NULL; | |
268 | evt_struct->crq.format = format; | |
269 | evt_struct->crq.timeout = timeout; | |
270 | evt_struct->done = done; | |
271 | } | |
272 | ||
273 | /* ------------------------------------------------------------ | |
274 | * Routines for receiving SCSI responses from the hosting partition | |
275 | */ | |
276 | ||
277 | /** | |
278 | * set_srp_direction: Set the fields in the srp related to data | |
279 | * direction and number of buffers based on the direction in | |
280 | * the scsi_cmnd and the number of buffers | |
281 | */ | |
282 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
283 | struct srp_cmd *srp_cmd, | |
284 | int numbuf) | |
285 | { | |
ef265673 FT |
286 | u8 fmt; |
287 | ||
1da177e4 LT |
288 | if (numbuf == 0) |
289 | return; | |
290 | ||
ef265673 FT |
291 | if (numbuf == 1) |
292 | fmt = SRP_DATA_DESC_DIRECT; | |
293 | else { | |
294 | fmt = SRP_DATA_DESC_INDIRECT; | |
295 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
296 | ||
1da177e4 | 297 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
298 | srp_cmd->data_out_desc_cnt = numbuf; |
299 | else | |
300 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 301 | } |
ef265673 FT |
302 | |
303 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
304 | srp_cmd->buf_fmt = fmt << 4; | |
305 | else | |
306 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
307 | } |
308 | ||
ef265673 | 309 | static void unmap_sg_list(int num_entries, |
4dddbc26 | 310 | struct device *dev, |
ef265673 FT |
311 | struct srp_direct_buf *md) |
312 | { | |
4dddbc26 JB |
313 | int i; |
314 | ||
ef265673 FT |
315 | for (i = 0; i < num_entries; ++i) |
316 | dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL); | |
4dddbc26 JB |
317 | } |
318 | ||
1da177e4 LT |
319 | /** |
320 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
321 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
322 | * @dev: device for which the memory is mapped | |
323 | * | |
324 | */ | |
4dddbc26 JB |
325 | static void unmap_cmd_data(struct srp_cmd *cmd, |
326 | struct srp_event_struct *evt_struct, | |
327 | struct device *dev) | |
1da177e4 | 328 | { |
ef265673 FT |
329 | u8 out_fmt, in_fmt; |
330 | ||
331 | out_fmt = cmd->buf_fmt >> 4; | |
332 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
333 | ||
334 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 335 | return; |
ef265673 FT |
336 | else if (out_fmt == SRP_DATA_DESC_DIRECT || |
337 | in_fmt == SRP_DATA_DESC_DIRECT) { | |
338 | struct srp_direct_buf *data = | |
339 | (struct srp_direct_buf *) cmd->add_data; | |
340 | dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL); | |
1da177e4 | 341 | } else { |
ef265673 FT |
342 | struct srp_indirect_buf *indirect = |
343 | (struct srp_indirect_buf *) cmd->add_data; | |
344 | int num_mapped = indirect->table_desc.len / | |
345 | sizeof(struct srp_direct_buf); | |
4dddbc26 JB |
346 | |
347 | if (num_mapped <= MAX_INDIRECT_BUFS) { | |
ef265673 | 348 | unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]); |
4dddbc26 | 349 | return; |
1da177e4 | 350 | } |
4dddbc26 JB |
351 | |
352 | unmap_sg_list(num_mapped, dev, evt_struct->ext_list); | |
1da177e4 LT |
353 | } |
354 | } | |
355 | ||
4dddbc26 JB |
356 | static int map_sg_list(int num_entries, |
357 | struct scatterlist *sg, | |
ef265673 | 358 | struct srp_direct_buf *md) |
4dddbc26 JB |
359 | { |
360 | int i; | |
361 | u64 total_length = 0; | |
362 | ||
363 | for (i = 0; i < num_entries; ++i) { | |
ef265673 | 364 | struct srp_direct_buf *descr = md + i; |
4dddbc26 | 365 | struct scatterlist *sg_entry = &sg[i]; |
ef265673 FT |
366 | descr->va = sg_dma_address(sg_entry); |
367 | descr->len = sg_dma_len(sg_entry); | |
368 | descr->key = 0; | |
4dddbc26 JB |
369 | total_length += sg_dma_len(sg_entry); |
370 | } | |
371 | return total_length; | |
372 | } | |
373 | ||
1da177e4 LT |
374 | /** |
375 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
376 | * @cmd: Scsi_Cmnd with the scatterlist | |
377 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
378 | * @dev: device for which to map dma memory | |
379 | * | |
380 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
381 | * Returns 1 on success. | |
382 | */ | |
383 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 384 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
385 | struct srp_cmd *srp_cmd, struct device *dev) |
386 | { | |
387 | ||
4dddbc26 | 388 | int sg_mapped; |
1da177e4 LT |
389 | u64 total_length = 0; |
390 | struct scatterlist *sg = cmd->request_buffer; | |
ef265673 FT |
391 | struct srp_direct_buf *data = |
392 | (struct srp_direct_buf *) srp_cmd->add_data; | |
393 | struct srp_indirect_buf *indirect = | |
394 | (struct srp_indirect_buf *) data; | |
1da177e4 LT |
395 | |
396 | sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL); | |
397 | ||
398 | if (sg_mapped == 0) | |
399 | return 0; | |
400 | ||
401 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
402 | ||
403 | /* special case; we can use a single direct descriptor */ | |
404 | if (sg_mapped == 1) { | |
ef265673 FT |
405 | data->va = sg_dma_address(&sg[0]); |
406 | data->len = sg_dma_len(&sg[0]); | |
407 | data->key = 0; | |
1da177e4 LT |
408 | return 1; |
409 | } | |
410 | ||
4dddbc26 | 411 | if (sg_mapped > SG_ALL) { |
1da177e4 LT |
412 | printk(KERN_ERR |
413 | "ibmvscsi: More than %d mapped sg entries, got %d\n", | |
4dddbc26 | 414 | SG_ALL, sg_mapped); |
1da177e4 LT |
415 | return 0; |
416 | } | |
417 | ||
ef265673 FT |
418 | indirect->table_desc.va = 0; |
419 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); | |
420 | indirect->table_desc.key = 0; | |
4dddbc26 JB |
421 | |
422 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
ef265673 FT |
423 | total_length = map_sg_list(sg_mapped, sg, |
424 | &indirect->desc_list[0]); | |
425 | indirect->len = total_length; | |
4dddbc26 | 426 | return 1; |
1da177e4 | 427 | } |
1da177e4 | 428 | |
4dddbc26 JB |
429 | /* get indirect table */ |
430 | if (!evt_struct->ext_list) { | |
ef265673 | 431 | evt_struct->ext_list = (struct srp_direct_buf *) |
4dddbc26 | 432 | dma_alloc_coherent(dev, |
ef265673 FT |
433 | SG_ALL * sizeof(struct srp_direct_buf), |
434 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 435 | if (!evt_struct->ext_list) { |
ef265673 FT |
436 | printk(KERN_ERR |
437 | "ibmvscsi: Can't allocate memory for indirect table\n"); | |
4dddbc26 JB |
438 | return 0; |
439 | ||
440 | } | |
441 | } | |
442 | ||
443 | total_length = map_sg_list(sg_mapped, sg, evt_struct->ext_list); | |
444 | ||
ef265673 FT |
445 | indirect->len = total_length; |
446 | indirect->table_desc.va = evt_struct->ext_list_token; | |
447 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); | |
448 | memcpy(indirect->desc_list, evt_struct->ext_list, | |
449 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 JB |
450 | |
451 | return 1; | |
1da177e4 LT |
452 | } |
453 | ||
454 | /** | |
455 | * map_single_data: - Maps memory and initializes memory decriptor fields | |
456 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
457 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
458 | * @dev: device for which to map dma memory | |
459 | * | |
460 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
461 | * Returns 1 on success. | |
462 | */ | |
463 | static int map_single_data(struct scsi_cmnd *cmd, | |
464 | struct srp_cmd *srp_cmd, struct device *dev) | |
465 | { | |
ef265673 FT |
466 | struct srp_direct_buf *data = |
467 | (struct srp_direct_buf *) srp_cmd->add_data; | |
1da177e4 | 468 | |
ef265673 | 469 | data->va = |
1da177e4 LT |
470 | dma_map_single(dev, cmd->request_buffer, |
471 | cmd->request_bufflen, | |
472 | DMA_BIDIRECTIONAL); | |
ef265673 | 473 | if (dma_mapping_error(data->va)) { |
1da177e4 LT |
474 | printk(KERN_ERR |
475 | "ibmvscsi: Unable to map request_buffer for command!\n"); | |
476 | return 0; | |
477 | } | |
ef265673 FT |
478 | data->len = cmd->request_bufflen; |
479 | data->key = 0; | |
1da177e4 LT |
480 | |
481 | set_srp_direction(cmd, srp_cmd, 1); | |
482 | ||
483 | return 1; | |
484 | } | |
485 | ||
486 | /** | |
487 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
488 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
489 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
490 | * @dev: dma device for which to map dma memory | |
491 | * | |
492 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
493 | * Returns 1 on success. | |
494 | */ | |
495 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 496 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
497 | struct srp_cmd *srp_cmd, struct device *dev) |
498 | { | |
499 | switch (cmd->sc_data_direction) { | |
500 | case DMA_FROM_DEVICE: | |
501 | case DMA_TO_DEVICE: | |
502 | break; | |
503 | case DMA_NONE: | |
504 | return 1; | |
505 | case DMA_BIDIRECTIONAL: | |
506 | printk(KERN_ERR | |
507 | "ibmvscsi: Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
508 | return 0; | |
509 | default: | |
510 | printk(KERN_ERR | |
511 | "ibmvscsi: Unknown data direction 0x%02x; can't map!\n", | |
512 | cmd->sc_data_direction); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | if (!cmd->request_buffer) | |
517 | return 1; | |
518 | if (cmd->use_sg) | |
4dddbc26 | 519 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
520 | return map_single_data(cmd, srp_cmd, dev); |
521 | } | |
522 | ||
523 | /* ------------------------------------------------------------ | |
524 | * Routines for sending and receiving SRPs | |
525 | */ | |
526 | /** | |
527 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
528 | * @evt_struct: evt_struct to be sent | |
529 | * @hostdata: ibmvscsi_host_data of host | |
530 | * | |
531 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
532 | * Note that this routine assumes that host_lock is held for synchronization | |
533 | */ | |
534 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
535 | struct ibmvscsi_host_data *hostdata) | |
536 | { | |
1da177e4 | 537 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
cefbda2d | 538 | int request_status; |
1da177e4 LT |
539 | int rc; |
540 | ||
a897ff2a RJ |
541 | /* If we have exhausted our request limit, just fail this request, |
542 | * unless it is for a reset or abort. | |
1da177e4 LT |
543 | * Note that there are rare cases involving driver generated requests |
544 | * (such as task management requests) that the mid layer may think we | |
545 | * can handle more requests (can_queue) when we actually can't | |
546 | */ | |
cefbda2d DB |
547 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
548 | request_status = | |
549 | atomic_dec_if_positive(&hostdata->request_limit); | |
550 | /* If request limit was -1 when we started, it is now even | |
551 | * less than that | |
552 | */ | |
553 | if (request_status < -1) | |
554 | goto send_error; | |
a897ff2a RJ |
555 | /* Otherwise, we may have run out of requests. */ |
556 | /* Abort and reset calls should make it through. | |
557 | * Nothing except abort and reset should use the last two | |
558 | * slots unless we had two or less to begin with. | |
559 | */ | |
560 | else if (request_status < 2 && | |
561 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
562 | /* In the case that we have less than two requests | |
563 | * available, check the server limit as a combination | |
564 | * of the request limit and the number of requests | |
565 | * in-flight (the size of the send list). If the | |
566 | * server limit is greater than 2, return busy so | |
567 | * that the last two are reserved for reset and abort. | |
568 | */ | |
569 | int server_limit = request_status; | |
570 | struct srp_event_struct *tmp_evt; | |
571 | ||
572 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
573 | server_limit++; | |
574 | } | |
575 | ||
576 | if (server_limit > 2) | |
577 | goto send_busy; | |
578 | } | |
cefbda2d | 579 | } |
1da177e4 LT |
580 | |
581 | /* Copy the IU into the transfer area */ | |
582 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 583 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
584 | |
585 | /* Add this to the sent list. We need to do this | |
586 | * before we actually send | |
587 | * in case it comes back REALLY fast | |
588 | */ | |
589 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
590 | ||
591 | if ((rc = | |
592 | ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { | |
593 | list_del(&evt_struct->list); | |
594 | ||
2b541f8f | 595 | printk(KERN_ERR "ibmvscsi: send error %d\n", |
1da177e4 | 596 | rc); |
a897ff2a | 597 | atomic_inc(&hostdata->request_limit); |
1da177e4 LT |
598 | goto send_error; |
599 | } | |
600 | ||
601 | return 0; | |
602 | ||
cefbda2d | 603 | send_busy: |
4dddbc26 | 604 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 605 | |
1da177e4 | 606 | free_event_struct(&hostdata->pool, evt_struct); |
a897ff2a RJ |
607 | atomic_inc(&hostdata->request_limit); |
608 | return SCSI_MLQUEUE_HOST_BUSY; | |
cefbda2d DB |
609 | |
610 | send_error: | |
611 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
612 | ||
613 | if (evt_struct->cmnd != NULL) { | |
614 | evt_struct->cmnd->result = DID_ERROR << 16; | |
615 | evt_struct->cmnd_done(evt_struct->cmnd); | |
616 | } else if (evt_struct->done) | |
617 | evt_struct->done(evt_struct); | |
618 | ||
619 | free_event_struct(&hostdata->pool, evt_struct); | |
620 | return 0; | |
1da177e4 LT |
621 | } |
622 | ||
623 | /** | |
624 | * handle_cmd_rsp: - Handle responses from commands | |
625 | * @evt_struct: srp_event_struct to be handled | |
626 | * | |
627 | * Used as a callback by when sending scsi cmds. | |
628 | * Gets called by ibmvscsi_handle_crq() | |
629 | */ | |
630 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
631 | { | |
632 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
633 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
634 | ||
ef265673 | 635 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 LT |
636 | if (printk_ratelimit()) |
637 | printk(KERN_WARNING | |
638 | "ibmvscsi: bad SRP RSP type %d\n", | |
ef265673 | 639 | rsp->opcode); |
1da177e4 LT |
640 | } |
641 | ||
642 | if (cmnd) { | |
643 | cmnd->result = rsp->status; | |
644 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) | |
645 | memcpy(cmnd->sense_buffer, | |
ef265673 FT |
646 | rsp->data, |
647 | rsp->sense_data_len); | |
1da177e4 | 648 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 649 | evt_struct, |
1da177e4 LT |
650 | evt_struct->hostdata->dev); |
651 | ||
ef265673 FT |
652 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
653 | cmnd->resid = rsp->data_out_res_cnt; | |
654 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) | |
655 | cmnd->resid = rsp->data_in_res_cnt; | |
1da177e4 LT |
656 | } |
657 | ||
658 | if (evt_struct->cmnd_done) | |
659 | evt_struct->cmnd_done(cmnd); | |
660 | } | |
661 | ||
662 | /** | |
663 | * lun_from_dev: - Returns the lun of the scsi device | |
664 | * @dev: struct scsi_device | |
665 | * | |
666 | */ | |
667 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
668 | { | |
669 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
670 | } | |
671 | ||
672 | /** | |
673 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
674 | * @cmd: struct scsi_cmnd to be executed | |
675 | * @done: Callback function to be called when cmd is completed | |
676 | */ | |
677 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, | |
678 | void (*done) (struct scsi_cmnd *)) | |
679 | { | |
680 | struct srp_cmd *srp_cmd; | |
681 | struct srp_event_struct *evt_struct; | |
ef265673 | 682 | struct srp_indirect_buf *indirect; |
1da177e4 LT |
683 | struct ibmvscsi_host_data *hostdata = |
684 | (struct ibmvscsi_host_data *)&cmnd->device->host->hostdata; | |
685 | u16 lun = lun_from_dev(cmnd->device); | |
ef265673 | 686 | u8 out_fmt, in_fmt; |
1da177e4 LT |
687 | |
688 | evt_struct = get_event_struct(&hostdata->pool); | |
689 | if (!evt_struct) | |
690 | return SCSI_MLQUEUE_HOST_BUSY; | |
691 | ||
1da177e4 LT |
692 | /* Set up the actual SRP IU */ |
693 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
694 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
695 | srp_cmd->opcode = SRP_CMD; | |
1da177e4 LT |
696 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd)); |
697 | srp_cmd->lun = ((u64) lun) << 48; | |
698 | ||
4dddbc26 | 699 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
1da177e4 LT |
700 | printk(KERN_ERR "ibmvscsi: couldn't convert cmd to srp_cmd\n"); |
701 | free_event_struct(&hostdata->pool, evt_struct); | |
702 | return SCSI_MLQUEUE_HOST_BUSY; | |
703 | } | |
704 | ||
4dddbc26 JB |
705 | init_event_struct(evt_struct, |
706 | handle_cmd_rsp, | |
707 | VIOSRP_SRP_FORMAT, | |
708 | cmnd->timeout_per_command/HZ); | |
709 | ||
710 | evt_struct->cmnd = cmnd; | |
711 | evt_struct->cmnd_done = done; | |
712 | ||
1da177e4 | 713 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
714 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
715 | out_fmt = srp_cmd->buf_fmt >> 4; | |
716 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
717 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
718 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
719 | indirect->table_desc.va == 0) { | |
720 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + | |
721 | offsetof(struct srp_cmd, add_data) + | |
722 | offsetof(struct srp_indirect_buf, desc_list); | |
1da177e4 LT |
723 | } |
724 | ||
725 | return ibmvscsi_send_srp_event(evt_struct, hostdata); | |
726 | } | |
727 | ||
728 | /* ------------------------------------------------------------ | |
729 | * Routines for driver initialization | |
730 | */ | |
731 | /** | |
732 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
733 | * @evt_struct: srp_event_struct with the response | |
734 | * | |
735 | * Used as a "done" callback by when sending adapter_info. Gets called | |
736 | * by ibmvscsi_handle_crq() | |
737 | */ | |
738 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
739 | { | |
740 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
741 | dma_unmap_single(hostdata->dev, | |
742 | evt_struct->iu.mad.adapter_info.buffer, | |
743 | evt_struct->iu.mad.adapter_info.common.length, | |
744 | DMA_BIDIRECTIONAL); | |
745 | ||
746 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
747 | printk("ibmvscsi: error %d getting adapter info\n", | |
748 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
749 | } else { | |
750 | printk("ibmvscsi: host srp version: %s, " | |
751 | "host partition %s (%d), OS %d, max io %u\n", | |
752 | hostdata->madapter_info.srp_version, | |
753 | hostdata->madapter_info.partition_name, | |
754 | hostdata->madapter_info.partition_number, | |
755 | hostdata->madapter_info.os_type, | |
756 | hostdata->madapter_info.port_max_txu[0]); | |
757 | ||
758 | if (hostdata->madapter_info.port_max_txu[0]) | |
759 | hostdata->host->max_sectors = | |
760 | hostdata->madapter_info.port_max_txu[0] >> 9; | |
154fb614 DB |
761 | |
762 | if (hostdata->madapter_info.os_type == 3 && | |
763 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { | |
764 | printk("ibmvscsi: host (Ver. %s) doesn't support large" | |
765 | "transfers\n", | |
766 | hostdata->madapter_info.srp_version); | |
767 | printk("ibmvscsi: limiting scatterlists to %d\n", | |
768 | MAX_INDIRECT_BUFS); | |
769 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; | |
770 | } | |
1da177e4 LT |
771 | } |
772 | } | |
773 | ||
774 | /** | |
775 | * send_mad_adapter_info: - Sends the mad adapter info request | |
776 | * and stores the result so it can be retrieved with | |
777 | * sysfs. We COULD consider causing a failure if the | |
778 | * returned SRP version doesn't match ours. | |
779 | * @hostdata: ibmvscsi_host_data of host | |
780 | * | |
781 | * Returns zero if successful. | |
782 | */ | |
783 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
784 | { | |
785 | struct viosrp_adapter_info *req; | |
786 | struct srp_event_struct *evt_struct; | |
e5dbfa66 FT |
787 | dma_addr_t addr; |
788 | ||
1da177e4 LT |
789 | evt_struct = get_event_struct(&hostdata->pool); |
790 | if (!evt_struct) { | |
791 | printk(KERN_ERR "ibmvscsi: couldn't allocate an event " | |
792 | "for ADAPTER_INFO_REQ!\n"); | |
793 | return; | |
794 | } | |
795 | ||
796 | init_event_struct(evt_struct, | |
797 | adapter_info_rsp, | |
798 | VIOSRP_MAD_FORMAT, | |
799 | init_timeout * HZ); | |
800 | ||
801 | req = &evt_struct->iu.mad.adapter_info; | |
802 | memset(req, 0x00, sizeof(*req)); | |
803 | ||
804 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; | |
805 | req->common.length = sizeof(hostdata->madapter_info); | |
e5dbfa66 FT |
806 | req->buffer = addr = dma_map_single(hostdata->dev, |
807 | &hostdata->madapter_info, | |
808 | sizeof(hostdata->madapter_info), | |
809 | DMA_BIDIRECTIONAL); | |
1da177e4 LT |
810 | |
811 | if (dma_mapping_error(req->buffer)) { | |
812 | printk(KERN_ERR | |
813 | "ibmvscsi: Unable to map request_buffer " | |
814 | "for adapter_info!\n"); | |
815 | free_event_struct(&hostdata->pool, evt_struct); | |
816 | return; | |
817 | } | |
818 | ||
e5dbfa66 | 819 | if (ibmvscsi_send_srp_event(evt_struct, hostdata)) { |
1da177e4 | 820 | printk(KERN_ERR "ibmvscsi: couldn't send ADAPTER_INFO_REQ!\n"); |
e5dbfa66 FT |
821 | dma_unmap_single(hostdata->dev, |
822 | addr, | |
823 | sizeof(hostdata->madapter_info), | |
824 | DMA_BIDIRECTIONAL); | |
825 | } | |
1da177e4 LT |
826 | }; |
827 | ||
828 | /** | |
829 | * login_rsp: - Handle response to SRP login request | |
830 | * @evt_struct: srp_event_struct with the response | |
831 | * | |
832 | * Used as a "done" callback by when sending srp_login. Gets called | |
833 | * by ibmvscsi_handle_crq() | |
834 | */ | |
835 | static void login_rsp(struct srp_event_struct *evt_struct) | |
836 | { | |
837 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
ef265673 FT |
838 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { |
839 | case SRP_LOGIN_RSP: /* it worked! */ | |
1da177e4 | 840 | break; |
ef265673 | 841 | case SRP_LOGIN_REJ: /* refused! */ |
2b541f8f DB |
842 | printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REJ reason %u\n", |
843 | evt_struct->xfer_iu->srp.login_rej.reason); | |
1da177e4 LT |
844 | /* Login failed. */ |
845 | atomic_set(&hostdata->request_limit, -1); | |
846 | return; | |
847 | default: | |
848 | printk(KERN_ERR | |
849 | "ibmvscsi: Invalid login response typecode 0x%02x!\n", | |
ef265673 | 850 | evt_struct->xfer_iu->srp.login_rsp.opcode); |
1da177e4 LT |
851 | /* Login failed. */ |
852 | atomic_set(&hostdata->request_limit, -1); | |
853 | return; | |
854 | } | |
855 | ||
856 | printk(KERN_INFO "ibmvscsi: SRP_LOGIN succeeded\n"); | |
857 | ||
a897ff2a RJ |
858 | if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta < 0) |
859 | printk(KERN_ERR "ibmvscsi: Invalid request_limit.\n"); | |
1da177e4 | 860 | |
a897ff2a RJ |
861 | /* Now we know what the real request-limit is. |
862 | * This value is set rather than added to request_limit because | |
863 | * request_limit could have been set to -1 by this client. | |
864 | */ | |
1da177e4 | 865 | atomic_set(&hostdata->request_limit, |
ef265673 | 866 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); |
1da177e4 | 867 | |
2b541f8f DB |
868 | /* If we had any pending I/Os, kick them */ |
869 | scsi_unblock_requests(hostdata->host); | |
870 | ||
1da177e4 LT |
871 | send_mad_adapter_info(hostdata); |
872 | return; | |
873 | } | |
874 | ||
875 | /** | |
876 | * send_srp_login: - Sends the srp login | |
877 | * @hostdata: ibmvscsi_host_data of host | |
878 | * | |
879 | * Returns zero if successful. | |
880 | */ | |
881 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
882 | { | |
883 | int rc; | |
884 | unsigned long flags; | |
885 | struct srp_login_req *login; | |
886 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
887 | if (!evt_struct) { | |
888 | printk(KERN_ERR | |
889 | "ibmvscsi: couldn't allocate an event for login req!\n"); | |
890 | return FAILED; | |
891 | } | |
892 | ||
893 | init_event_struct(evt_struct, | |
894 | login_rsp, | |
895 | VIOSRP_SRP_FORMAT, | |
896 | init_timeout * HZ); | |
897 | ||
898 | login = &evt_struct->iu.srp.login_req; | |
2b541f8f | 899 | memset(login, 0x00, sizeof(struct srp_login_req)); |
ef265673 FT |
900 | login->opcode = SRP_LOGIN_REQ; |
901 | login->req_it_iu_len = sizeof(union srp_iu); | |
902 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; | |
1da177e4 | 903 | |
9b833e42 | 904 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
905 | /* Start out with a request limit of 1, since this is negotiated in |
906 | * the login request we are just sending | |
907 | */ | |
908 | atomic_set(&hostdata->request_limit, 1); | |
909 | ||
1da177e4 LT |
910 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata); |
911 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
9b833e42 | 912 | printk("ibmvscsic: sent SRP login\n"); |
1da177e4 LT |
913 | return rc; |
914 | }; | |
915 | ||
916 | /** | |
917 | * sync_completion: Signal that a synchronous command has completed | |
918 | * Note that after returning from this call, the evt_struct is freed. | |
919 | * the caller waiting on this completion shouldn't touch the evt_struct | |
920 | * again. | |
921 | */ | |
922 | static void sync_completion(struct srp_event_struct *evt_struct) | |
923 | { | |
924 | /* copy the response back */ | |
925 | if (evt_struct->sync_srp) | |
926 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
927 | ||
928 | complete(&evt_struct->comp); | |
929 | } | |
930 | ||
931 | /** | |
932 | * ibmvscsi_abort: Abort a command...from scsi host template | |
933 | * send this over to the server and wait synchronously for the response | |
934 | */ | |
935 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
936 | { | |
937 | struct ibmvscsi_host_data *hostdata = | |
938 | (struct ibmvscsi_host_data *)cmd->device->host->hostdata; | |
939 | struct srp_tsk_mgmt *tsk_mgmt; | |
940 | struct srp_event_struct *evt; | |
941 | struct srp_event_struct *tmp_evt, *found_evt; | |
942 | union viosrp_iu srp_rsp; | |
943 | int rsp_rc; | |
be042f24 | 944 | unsigned long flags; |
1da177e4 LT |
945 | u16 lun = lun_from_dev(cmd->device); |
946 | ||
947 | /* First, find this command in our sent list so we can figure | |
948 | * out the correct tag | |
949 | */ | |
be042f24 | 950 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
951 | found_evt = NULL; |
952 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
953 | if (tmp_evt->cmnd == cmd) { | |
954 | found_evt = tmp_evt; | |
955 | break; | |
956 | } | |
957 | } | |
958 | ||
be042f24 DB |
959 | if (!found_evt) { |
960 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1da177e4 | 961 | return FAILED; |
be042f24 | 962 | } |
1da177e4 LT |
963 | |
964 | evt = get_event_struct(&hostdata->pool); | |
965 | if (evt == NULL) { | |
be042f24 | 966 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
967 | printk(KERN_ERR "ibmvscsi: failed to allocate abort event\n"); |
968 | return FAILED; | |
969 | } | |
970 | ||
971 | init_event_struct(evt, | |
972 | sync_completion, | |
973 | VIOSRP_SRP_FORMAT, | |
974 | init_timeout * HZ); | |
975 | ||
976 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; | |
977 | ||
978 | /* Set up an abort SRP command */ | |
979 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
ef265673 | 980 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
1da177e4 | 981 | tsk_mgmt->lun = ((u64) lun) << 48; |
ef265673 FT |
982 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; |
983 | tsk_mgmt->task_tag = (u64) found_evt; | |
1da177e4 LT |
984 | |
985 | printk(KERN_INFO "ibmvscsi: aborting command. lun 0x%lx, tag 0x%lx\n", | |
ef265673 | 986 | tsk_mgmt->lun, tsk_mgmt->task_tag); |
1da177e4 LT |
987 | |
988 | evt->sync_srp = &srp_rsp; | |
989 | init_completion(&evt->comp); | |
be042f24 DB |
990 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata); |
991 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
992 | if (rsp_rc != 0) { | |
1da177e4 LT |
993 | printk(KERN_ERR "ibmvscsi: failed to send abort() event\n"); |
994 | return FAILED; | |
995 | } | |
996 | ||
1da177e4 | 997 | wait_for_completion(&evt->comp); |
1da177e4 LT |
998 | |
999 | /* make sure we got a good response */ | |
ef265673 | 1000 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 LT |
1001 | if (printk_ratelimit()) |
1002 | printk(KERN_WARNING | |
1003 | "ibmvscsi: abort bad SRP RSP type %d\n", | |
ef265673 | 1004 | srp_rsp.srp.rsp.opcode); |
1da177e4 LT |
1005 | return FAILED; |
1006 | } | |
1007 | ||
ef265673 FT |
1008 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1009 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1010 | else |
1011 | rsp_rc = srp_rsp.srp.rsp.status; | |
1012 | ||
1013 | if (rsp_rc) { | |
1014 | if (printk_ratelimit()) | |
1015 | printk(KERN_WARNING | |
ef265673 | 1016 | "ibmvscsi: abort code %d for task tag 0x%lx\n", |
1da177e4 | 1017 | rsp_rc, |
ef265673 | 1018 | tsk_mgmt->task_tag); |
1da177e4 LT |
1019 | return FAILED; |
1020 | } | |
1021 | ||
1022 | /* Because we dropped the spinlock above, it's possible | |
1023 | * The event is no longer in our list. Make sure it didn't | |
1024 | * complete while we were aborting | |
1025 | */ | |
be042f24 | 1026 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1027 | found_evt = NULL; |
1028 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1029 | if (tmp_evt->cmnd == cmd) { | |
1030 | found_evt = tmp_evt; | |
1031 | break; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | if (found_evt == NULL) { | |
be042f24 | 1036 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1037 | printk(KERN_INFO |
1038 | "ibmvscsi: aborted task tag 0x%lx completed\n", | |
ef265673 | 1039 | tsk_mgmt->task_tag); |
1da177e4 LT |
1040 | return SUCCESS; |
1041 | } | |
1042 | ||
1043 | printk(KERN_INFO | |
1044 | "ibmvscsi: successfully aborted task tag 0x%lx\n", | |
ef265673 | 1045 | tsk_mgmt->task_tag); |
1da177e4 LT |
1046 | |
1047 | cmd->result = (DID_ABORT << 16); | |
1048 | list_del(&found_evt->list); | |
4dddbc26 JB |
1049 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1050 | found_evt->hostdata->dev); | |
1da177e4 | 1051 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1052 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1053 | atomic_inc(&hostdata->request_limit); |
1054 | return SUCCESS; | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1059 | * template send this over to the server and wait synchronously for the | |
1060 | * response | |
1061 | */ | |
1062 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1063 | { | |
1064 | struct ibmvscsi_host_data *hostdata = | |
1065 | (struct ibmvscsi_host_data *)cmd->device->host->hostdata; | |
1066 | ||
1067 | struct srp_tsk_mgmt *tsk_mgmt; | |
1068 | struct srp_event_struct *evt; | |
1069 | struct srp_event_struct *tmp_evt, *pos; | |
1070 | union viosrp_iu srp_rsp; | |
1071 | int rsp_rc; | |
be042f24 | 1072 | unsigned long flags; |
1da177e4 LT |
1073 | u16 lun = lun_from_dev(cmd->device); |
1074 | ||
be042f24 | 1075 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1076 | evt = get_event_struct(&hostdata->pool); |
1077 | if (evt == NULL) { | |
be042f24 | 1078 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1079 | printk(KERN_ERR "ibmvscsi: failed to allocate reset event\n"); |
1080 | return FAILED; | |
1081 | } | |
1082 | ||
1083 | init_event_struct(evt, | |
1084 | sync_completion, | |
1085 | VIOSRP_SRP_FORMAT, | |
1086 | init_timeout * HZ); | |
1087 | ||
1088 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; | |
1089 | ||
1090 | /* Set up a lun reset SRP command */ | |
1091 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
ef265673 | 1092 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
1da177e4 | 1093 | tsk_mgmt->lun = ((u64) lun) << 48; |
ef265673 | 1094 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; |
1da177e4 LT |
1095 | |
1096 | printk(KERN_INFO "ibmvscsi: resetting device. lun 0x%lx\n", | |
1097 | tsk_mgmt->lun); | |
1098 | ||
1099 | evt->sync_srp = &srp_rsp; | |
1100 | init_completion(&evt->comp); | |
be042f24 DB |
1101 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata); |
1102 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1103 | if (rsp_rc != 0) { | |
1da177e4 LT |
1104 | printk(KERN_ERR "ibmvscsi: failed to send reset event\n"); |
1105 | return FAILED; | |
1106 | } | |
1107 | ||
1da177e4 | 1108 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1109 | |
1110 | /* make sure we got a good response */ | |
ef265673 | 1111 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 LT |
1112 | if (printk_ratelimit()) |
1113 | printk(KERN_WARNING | |
1114 | "ibmvscsi: reset bad SRP RSP type %d\n", | |
ef265673 | 1115 | srp_rsp.srp.rsp.opcode); |
1da177e4 LT |
1116 | return FAILED; |
1117 | } | |
1118 | ||
ef265673 FT |
1119 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1120 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1121 | else |
1122 | rsp_rc = srp_rsp.srp.rsp.status; | |
1123 | ||
1124 | if (rsp_rc) { | |
1125 | if (printk_ratelimit()) | |
1126 | printk(KERN_WARNING | |
1127 | "ibmvscsi: reset code %d for task tag 0x%lx\n", | |
ef265673 | 1128 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1129 | return FAILED; |
1130 | } | |
1131 | ||
1132 | /* We need to find all commands for this LUN that have not yet been | |
1133 | * responded to, and fail them with DID_RESET | |
1134 | */ | |
be042f24 | 1135 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1136 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1137 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1138 | if (tmp_evt->cmnd) | |
1139 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1140 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1141 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1142 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1143 | free_event_struct(&tmp_evt->hostdata->pool, |
1144 | tmp_evt); | |
1145 | atomic_inc(&hostdata->request_limit); | |
1146 | if (tmp_evt->cmnd_done) | |
1147 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1148 | else if (tmp_evt->done) | |
1149 | tmp_evt->done(tmp_evt); | |
1150 | } | |
1151 | } | |
be042f24 | 1152 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1153 | return SUCCESS; |
1154 | } | |
1155 | ||
1156 | /** | |
1157 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
1158 | * @hostdata: the adapter | |
1159 | */ | |
2b541f8f | 1160 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) |
1da177e4 LT |
1161 | { |
1162 | struct srp_event_struct *tmp_evt, *pos; | |
1163 | unsigned long flags; | |
1164 | ||
1165 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1166 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { | |
1167 | list_del(&tmp_evt->list); | |
1168 | if (tmp_evt->cmnd) { | |
2b541f8f | 1169 | tmp_evt->cmnd->result = (error_code << 16); |
1da177e4 | 1170 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, |
4dddbc26 | 1171 | tmp_evt, |
1da177e4 LT |
1172 | tmp_evt->hostdata->dev); |
1173 | if (tmp_evt->cmnd_done) | |
1174 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1175 | } else { | |
1176 | if (tmp_evt->done) { | |
1177 | tmp_evt->done(tmp_evt); | |
1178 | } | |
1179 | } | |
1180 | free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); | |
1181 | } | |
1182 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1183 | } | |
1184 | ||
1185 | /** | |
1186 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1187 | * @crq: Command/Response queue | |
1188 | * @hostdata: ibmvscsi_host_data of host | |
1189 | * | |
1190 | */ | |
1191 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, | |
1192 | struct ibmvscsi_host_data *hostdata) | |
1193 | { | |
1194 | unsigned long flags; | |
1195 | struct srp_event_struct *evt_struct = | |
1196 | (struct srp_event_struct *)crq->IU_data_ptr; | |
1197 | switch (crq->valid) { | |
1198 | case 0xC0: /* initialization */ | |
1199 | switch (crq->format) { | |
1200 | case 0x01: /* Initialization message */ | |
1201 | printk(KERN_INFO "ibmvscsi: partner initialized\n"); | |
1202 | /* Send back a response */ | |
1203 | if (ibmvscsi_send_crq(hostdata, | |
1204 | 0xC002000000000000LL, 0) == 0) { | |
1205 | /* Now login */ | |
1206 | send_srp_login(hostdata); | |
1207 | } else { | |
1208 | printk(KERN_ERR | |
1209 | "ibmvscsi: Unable to send init rsp\n"); | |
1210 | } | |
1211 | ||
1212 | break; | |
1213 | case 0x02: /* Initialization response */ | |
1214 | printk(KERN_INFO | |
1215 | "ibmvscsi: partner initialization complete\n"); | |
1216 | ||
1217 | /* Now login */ | |
1218 | send_srp_login(hostdata); | |
1219 | break; | |
1220 | default: | |
1221 | printk(KERN_ERR "ibmvscsi: unknown crq message type\n"); | |
1222 | } | |
1223 | return; | |
2b541f8f DB |
1224 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
1225 | scsi_block_requests(hostdata->host); | |
cefbda2d | 1226 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1227 | if (crq->format == 0x06) { |
1228 | /* We need to re-setup the interpartition connection */ | |
1229 | printk(KERN_INFO | |
1230 | "ibmvscsi: Re-enabling adapter!\n"); | |
1231 | purge_requests(hostdata, DID_REQUEUE); | |
cefbda2d | 1232 | if ((ibmvscsi_reenable_crq_queue(&hostdata->queue, |
9c3121fe | 1233 | hostdata)) || |
cefbda2d DB |
1234 | (ibmvscsi_send_crq(hostdata, |
1235 | 0xC001000000000000LL, 0))) { | |
1236 | atomic_set(&hostdata->request_limit, | |
1237 | -1); | |
2b541f8f | 1238 | printk(KERN_ERR |
cefbda2d | 1239 | "ibmvscsi: error after" |
2b541f8f | 1240 | " enable\n"); |
cefbda2d | 1241 | } |
2b541f8f DB |
1242 | } else { |
1243 | printk(KERN_INFO | |
1244 | "ibmvscsi: Virtual adapter failed rc %d!\n", | |
1245 | crq->format); | |
1da177e4 | 1246 | |
2b541f8f | 1247 | purge_requests(hostdata, DID_ERROR); |
cefbda2d DB |
1248 | if ((ibmvscsi_reset_crq_queue(&hostdata->queue, |
1249 | hostdata)) || | |
1250 | (ibmvscsi_send_crq(hostdata, | |
1251 | 0xC001000000000000LL, 0))) { | |
1252 | atomic_set(&hostdata->request_limit, | |
1253 | -1); | |
1254 | printk(KERN_ERR | |
1255 | "ibmvscsi: error after reset\n"); | |
1256 | } | |
2b541f8f DB |
1257 | } |
1258 | scsi_unblock_requests(hostdata->host); | |
1da177e4 LT |
1259 | return; |
1260 | case 0x80: /* real payload */ | |
1261 | break; | |
1262 | default: | |
1263 | printk(KERN_ERR | |
1264 | "ibmvscsi: got an invalid message type 0x%02x\n", | |
1265 | crq->valid); | |
1266 | return; | |
1267 | } | |
1268 | ||
1269 | /* The only kind of payload CRQs we should get are responses to | |
1270 | * things we send. Make sure this response is to something we | |
1271 | * actually sent | |
1272 | */ | |
1273 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
1274 | printk(KERN_ERR | |
1275 | "ibmvscsi: returned correlation_token 0x%p is invalid!\n", | |
1276 | (void *)crq->IU_data_ptr); | |
1277 | return; | |
1278 | } | |
1279 | ||
1280 | if (atomic_read(&evt_struct->free)) { | |
1281 | printk(KERN_ERR | |
1282 | "ibmvscsi: received duplicate correlation_token 0x%p!\n", | |
1283 | (void *)crq->IU_data_ptr); | |
1284 | return; | |
1285 | } | |
1286 | ||
1287 | if (crq->format == VIOSRP_SRP_FORMAT) | |
ef265673 | 1288 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
1da177e4 LT |
1289 | &hostdata->request_limit); |
1290 | ||
1291 | if (evt_struct->done) | |
1292 | evt_struct->done(evt_struct); | |
1293 | else | |
1294 | printk(KERN_ERR | |
1295 | "ibmvscsi: returned done() is NULL; not running it!\n"); | |
1296 | ||
1297 | /* | |
1298 | * Lock the host_lock before messing with these structures, since we | |
1299 | * are running in a task context | |
1300 | */ | |
1301 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1302 | list_del(&evt_struct->list); | |
1303 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1304 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1305 | } | |
1306 | ||
1307 | /** | |
1308 | * ibmvscsi_get_host_config: Send the command to the server to get host | |
1309 | * configuration data. The data is opaque to us. | |
1310 | */ | |
1311 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, | |
1312 | unsigned char *buffer, int length) | |
1313 | { | |
1314 | struct viosrp_host_config *host_config; | |
1315 | struct srp_event_struct *evt_struct; | |
e5dbfa66 | 1316 | dma_addr_t addr; |
1da177e4 LT |
1317 | int rc; |
1318 | ||
1319 | evt_struct = get_event_struct(&hostdata->pool); | |
1320 | if (!evt_struct) { | |
1321 | printk(KERN_ERR | |
1322 | "ibmvscsi: could't allocate event for HOST_CONFIG!\n"); | |
1323 | return -1; | |
1324 | } | |
1325 | ||
1326 | init_event_struct(evt_struct, | |
1327 | sync_completion, | |
1328 | VIOSRP_MAD_FORMAT, | |
1329 | init_timeout * HZ); | |
1330 | ||
1331 | host_config = &evt_struct->iu.mad.host_config; | |
1332 | ||
1333 | /* Set up a lun reset SRP command */ | |
1334 | memset(host_config, 0x00, sizeof(*host_config)); | |
1335 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; | |
1336 | host_config->common.length = length; | |
e5dbfa66 FT |
1337 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
1338 | length, | |
1339 | DMA_BIDIRECTIONAL); | |
1da177e4 LT |
1340 | |
1341 | if (dma_mapping_error(host_config->buffer)) { | |
1342 | printk(KERN_ERR | |
1343 | "ibmvscsi: dma_mapping error " "getting host config\n"); | |
1344 | free_event_struct(&hostdata->pool, evt_struct); | |
1345 | return -1; | |
1346 | } | |
1347 | ||
1348 | init_completion(&evt_struct->comp); | |
1349 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata); | |
e5dbfa66 | 1350 | if (rc == 0) |
1da177e4 | 1351 | wait_for_completion(&evt_struct->comp); |
e5dbfa66 | 1352 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
1da177e4 LT |
1353 | |
1354 | return rc; | |
1355 | } | |
1356 | ||
1357 | /* ------------------------------------------------------------ | |
1358 | * sysfs attributes | |
1359 | */ | |
1360 | static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf) | |
1361 | { | |
1362 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1363 | struct ibmvscsi_host_data *hostdata = | |
1364 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1365 | int len; | |
1366 | ||
1367 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1368 | hostdata->madapter_info.srp_version); | |
1369 | return len; | |
1370 | } | |
1371 | ||
1372 | static struct class_device_attribute ibmvscsi_host_srp_version = { | |
1373 | .attr = { | |
1374 | .name = "srp_version", | |
1375 | .mode = S_IRUGO, | |
1376 | }, | |
1377 | .show = show_host_srp_version, | |
1378 | }; | |
1379 | ||
1380 | static ssize_t show_host_partition_name(struct class_device *class_dev, | |
1381 | char *buf) | |
1382 | { | |
1383 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1384 | struct ibmvscsi_host_data *hostdata = | |
1385 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1386 | int len; | |
1387 | ||
1388 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1389 | hostdata->madapter_info.partition_name); | |
1390 | return len; | |
1391 | } | |
1392 | ||
1393 | static struct class_device_attribute ibmvscsi_host_partition_name = { | |
1394 | .attr = { | |
1395 | .name = "partition_name", | |
1396 | .mode = S_IRUGO, | |
1397 | }, | |
1398 | .show = show_host_partition_name, | |
1399 | }; | |
1400 | ||
1401 | static ssize_t show_host_partition_number(struct class_device *class_dev, | |
1402 | char *buf) | |
1403 | { | |
1404 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1405 | struct ibmvscsi_host_data *hostdata = | |
1406 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1407 | int len; | |
1408 | ||
1409 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1410 | hostdata->madapter_info.partition_number); | |
1411 | return len; | |
1412 | } | |
1413 | ||
1414 | static struct class_device_attribute ibmvscsi_host_partition_number = { | |
1415 | .attr = { | |
1416 | .name = "partition_number", | |
1417 | .mode = S_IRUGO, | |
1418 | }, | |
1419 | .show = show_host_partition_number, | |
1420 | }; | |
1421 | ||
1422 | static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf) | |
1423 | { | |
1424 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1425 | struct ibmvscsi_host_data *hostdata = | |
1426 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1427 | int len; | |
1428 | ||
1429 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1430 | hostdata->madapter_info.mad_version); | |
1431 | return len; | |
1432 | } | |
1433 | ||
1434 | static struct class_device_attribute ibmvscsi_host_mad_version = { | |
1435 | .attr = { | |
1436 | .name = "mad_version", | |
1437 | .mode = S_IRUGO, | |
1438 | }, | |
1439 | .show = show_host_mad_version, | |
1440 | }; | |
1441 | ||
1442 | static ssize_t show_host_os_type(struct class_device *class_dev, char *buf) | |
1443 | { | |
1444 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1445 | struct ibmvscsi_host_data *hostdata = | |
1446 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1447 | int len; | |
1448 | ||
1449 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); | |
1450 | return len; | |
1451 | } | |
1452 | ||
1453 | static struct class_device_attribute ibmvscsi_host_os_type = { | |
1454 | .attr = { | |
1455 | .name = "os_type", | |
1456 | .mode = S_IRUGO, | |
1457 | }, | |
1458 | .show = show_host_os_type, | |
1459 | }; | |
1460 | ||
1461 | static ssize_t show_host_config(struct class_device *class_dev, char *buf) | |
1462 | { | |
1463 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1464 | struct ibmvscsi_host_data *hostdata = | |
1465 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1466 | ||
1467 | /* returns null-terminated host config data */ | |
1468 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) | |
1469 | return strlen(buf); | |
1470 | else | |
1471 | return 0; | |
1472 | } | |
1473 | ||
1474 | static struct class_device_attribute ibmvscsi_host_config = { | |
1475 | .attr = { | |
1476 | .name = "config", | |
1477 | .mode = S_IRUGO, | |
1478 | }, | |
1479 | .show = show_host_config, | |
1480 | }; | |
1481 | ||
1482 | static struct class_device_attribute *ibmvscsi_attrs[] = { | |
1483 | &ibmvscsi_host_srp_version, | |
1484 | &ibmvscsi_host_partition_name, | |
1485 | &ibmvscsi_host_partition_number, | |
1486 | &ibmvscsi_host_mad_version, | |
1487 | &ibmvscsi_host_os_type, | |
1488 | &ibmvscsi_host_config, | |
1489 | NULL | |
1490 | }; | |
1491 | ||
1492 | /* ------------------------------------------------------------ | |
1493 | * SCSI driver registration | |
1494 | */ | |
1495 | static struct scsi_host_template driver_template = { | |
1496 | .module = THIS_MODULE, | |
1497 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
1498 | .proc_name = "ibmvscsi", | |
1499 | .queuecommand = ibmvscsi_queuecommand, | |
1500 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
1501 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
1502 | .cmd_per_lun = 16, | |
a897ff2a | 1503 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 1504 | .this_id = -1, |
4dddbc26 | 1505 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
1506 | .use_clustering = ENABLE_CLUSTERING, |
1507 | .shost_attrs = ibmvscsi_attrs, | |
1508 | }; | |
1509 | ||
1510 | /** | |
1511 | * Called by bus code for each adapter | |
1512 | */ | |
1513 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
1514 | { | |
1515 | struct ibmvscsi_host_data *hostdata; | |
1516 | struct Scsi_Host *host; | |
1517 | struct device *dev = &vdev->dev; | |
1518 | unsigned long wait_switch = 0; | |
cefbda2d | 1519 | int rc; |
1da177e4 LT |
1520 | |
1521 | vdev->dev.driver_data = NULL; | |
1522 | ||
a897ff2a | 1523 | driver_template.can_queue = max_requests; |
1da177e4 LT |
1524 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); |
1525 | if (!host) { | |
1526 | printk(KERN_ERR "ibmvscsi: couldn't allocate host data\n"); | |
1527 | goto scsi_host_alloc_failed; | |
1528 | } | |
1529 | ||
1530 | hostdata = (struct ibmvscsi_host_data *)host->hostdata; | |
1531 | memset(hostdata, 0x00, sizeof(*hostdata)); | |
1532 | INIT_LIST_HEAD(&hostdata->sent); | |
1533 | hostdata->host = host; | |
1534 | hostdata->dev = dev; | |
1535 | atomic_set(&hostdata->request_limit, -1); | |
1536 | hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */ | |
1537 | ||
cefbda2d DB |
1538 | rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_requests); |
1539 | if (rc != 0 && rc != H_RESOURCE) { | |
1da177e4 LT |
1540 | printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n"); |
1541 | goto init_crq_failed; | |
1542 | } | |
1543 | if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) { | |
1544 | printk(KERN_ERR "ibmvscsi: couldn't initialize event pool\n"); | |
1545 | goto init_pool_failed; | |
1546 | } | |
1547 | ||
1548 | host->max_lun = 8; | |
1549 | host->max_id = max_id; | |
1550 | host->max_channel = max_channel; | |
1551 | ||
1552 | if (scsi_add_host(hostdata->host, hostdata->dev)) | |
1553 | goto add_host_failed; | |
1554 | ||
1555 | /* Try to send an initialization message. Note that this is allowed | |
1556 | * to fail if the other end is not acive. In that case we don't | |
1557 | * want to scan | |
1558 | */ | |
cefbda2d DB |
1559 | if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
1560 | || rc == H_RESOURCE) { | |
1da177e4 LT |
1561 | /* |
1562 | * Wait around max init_timeout secs for the adapter to finish | |
1563 | * initializing. When we are done initializing, we will have a | |
1564 | * valid request_limit. We don't want Linux scanning before | |
1565 | * we are ready. | |
1566 | */ | |
1567 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1568 | time_before(jiffies, wait_switch) && | |
1569 | atomic_read(&hostdata->request_limit) < 2;) { | |
1570 | ||
1571 | msleep(10); | |
1572 | } | |
1573 | ||
1574 | /* if we now have a valid request_limit, initiate a scan */ | |
1575 | if (atomic_read(&hostdata->request_limit) > 0) | |
1576 | scsi_scan_host(host); | |
1577 | } | |
1578 | ||
1579 | vdev->dev.driver_data = hostdata; | |
1580 | return 0; | |
1581 | ||
1582 | add_host_failed: | |
1583 | release_event_pool(&hostdata->pool, hostdata); | |
1584 | init_pool_failed: | |
1585 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests); | |
1586 | init_crq_failed: | |
1587 | scsi_host_put(host); | |
1588 | scsi_host_alloc_failed: | |
1589 | return -1; | |
1590 | } | |
1591 | ||
1592 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
1593 | { | |
1594 | struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data; | |
1595 | release_event_pool(&hostdata->pool, hostdata); | |
1596 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, | |
1597 | max_requests); | |
1598 | ||
1599 | scsi_remove_host(hostdata->host); | |
1600 | scsi_host_put(hostdata->host); | |
1601 | ||
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | /** | |
1606 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
1607 | * support. | |
1608 | */ | |
1609 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { | |
1610 | {"vscsi", "IBM,v-scsi"}, | |
fb120da6 | 1611 | { "", "" } |
1da177e4 | 1612 | }; |
1da177e4 | 1613 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 1614 | |
1da177e4 | 1615 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
1616 | .id_table = ibmvscsi_device_table, |
1617 | .probe = ibmvscsi_probe, | |
6fdf5392 SR |
1618 | .remove = ibmvscsi_remove, |
1619 | .driver = { | |
1620 | .name = "ibmvscsi", | |
915124d8 | 1621 | .owner = THIS_MODULE, |
6fdf5392 | 1622 | } |
1da177e4 LT |
1623 | }; |
1624 | ||
1625 | int __init ibmvscsi_module_init(void) | |
1626 | { | |
1627 | return vio_register_driver(&ibmvscsi_driver); | |
1628 | } | |
1629 | ||
1630 | void __exit ibmvscsi_module_exit(void) | |
1631 | { | |
1632 | vio_unregister_driver(&ibmvscsi_driver); | |
1633 | } | |
1634 | ||
1635 | module_init(ibmvscsi_module_init); | |
1636 | module_exit(ibmvscsi_module_exit); |