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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; | |
88 | static int max_requests = 50; | |
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; | |
124 | pool->events = kmalloc(pool->size * sizeof(*pool->events), GFP_KERNEL); | |
125 | if (!pool->events) | |
126 | return -ENOMEM; | |
127 | memset(pool->events, 0x00, pool->size * sizeof(*pool->events)); | |
128 | ||
129 | pool->iu_storage = | |
130 | dma_alloc_coherent(hostdata->dev, | |
131 | pool->size * sizeof(*pool->iu_storage), | |
132 | &pool->iu_token, 0); | |
133 | if (!pool->iu_storage) { | |
134 | kfree(pool->events); | |
135 | return -ENOMEM; | |
136 | } | |
137 | ||
138 | for (i = 0; i < pool->size; ++i) { | |
139 | struct srp_event_struct *evt = &pool->events[i]; | |
140 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
141 | atomic_set(&evt->free, 1); | |
142 | evt->crq.valid = 0x80; | |
143 | evt->crq.IU_length = sizeof(*evt->xfer_iu); | |
144 | evt->crq.IU_data_ptr = pool->iu_token + | |
145 | sizeof(*evt->xfer_iu) * i; | |
146 | evt->xfer_iu = pool->iu_storage + i; | |
147 | evt->hostdata = hostdata; | |
4dddbc26 JB |
148 | evt->ext_list = NULL; |
149 | evt->ext_list_token = 0; | |
1da177e4 LT |
150 | } |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | /** | |
156 | * release_event_pool: - Frees memory of an event pool of a host | |
157 | * @pool: event_pool to be released | |
158 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
159 | * | |
160 | * Returns zero on success. | |
161 | */ | |
162 | static void release_event_pool(struct event_pool *pool, | |
163 | struct ibmvscsi_host_data *hostdata) | |
164 | { | |
165 | int i, in_use = 0; | |
4dddbc26 | 166 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
167 | if (atomic_read(&pool->events[i].free) != 1) |
168 | ++in_use; | |
4dddbc26 JB |
169 | if (pool->events[i].ext_list) { |
170 | dma_free_coherent(hostdata->dev, | |
ef265673 | 171 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
172 | pool->events[i].ext_list, |
173 | pool->events[i].ext_list_token); | |
174 | } | |
175 | } | |
1da177e4 LT |
176 | if (in_use) |
177 | printk(KERN_WARNING | |
178 | "ibmvscsi: releasing event pool with %d " | |
179 | "events still in use?\n", in_use); | |
180 | kfree(pool->events); | |
181 | dma_free_coherent(hostdata->dev, | |
182 | pool->size * sizeof(*pool->iu_storage), | |
183 | pool->iu_storage, pool->iu_token); | |
184 | } | |
185 | ||
186 | /** | |
187 | * valid_event_struct: - Determines if event is valid. | |
188 | * @pool: event_pool that contains the event | |
189 | * @evt: srp_event_struct to be checked for validity | |
190 | * | |
191 | * Returns zero if event is invalid, one otherwise. | |
192 | */ | |
193 | static int valid_event_struct(struct event_pool *pool, | |
194 | struct srp_event_struct *evt) | |
195 | { | |
196 | int index = evt - pool->events; | |
197 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
198 | return 0; | |
199 | if (evt != pool->events + index) /* unaligned */ | |
200 | return 0; | |
201 | return 1; | |
202 | } | |
203 | ||
204 | /** | |
205 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
206 | * @pool: event_pool that contains the event | |
207 | * @evt: srp_event_struct to be modified | |
208 | * | |
209 | */ | |
210 | static void free_event_struct(struct event_pool *pool, | |
211 | struct srp_event_struct *evt) | |
212 | { | |
213 | if (!valid_event_struct(pool, evt)) { | |
214 | printk(KERN_ERR | |
215 | "ibmvscsi: Freeing invalid event_struct %p " | |
216 | "(not in pool %p)\n", evt, pool->events); | |
217 | return; | |
218 | } | |
219 | if (atomic_inc_return(&evt->free) != 1) { | |
220 | printk(KERN_ERR | |
221 | "ibmvscsi: Freeing event_struct %p " | |
222 | "which is not in use!\n", evt); | |
223 | return; | |
224 | } | |
225 | } | |
226 | ||
227 | /** | |
228 | * get_evt_struct: - Gets the next free event in pool | |
229 | * @pool: event_pool that contains the events to be searched | |
230 | * | |
231 | * Returns the next event in "free" state, and NULL if none are free. | |
232 | * Note that no synchronization is done here, we assume the host_lock | |
233 | * will syncrhonze things. | |
234 | */ | |
235 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
236 | { | |
237 | int i; | |
238 | int poolsize = pool->size; | |
239 | int offset = pool->next; | |
240 | ||
241 | for (i = 0; i < poolsize; i++) { | |
242 | offset = (offset + 1) % poolsize; | |
243 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
244 | pool->next = offset; | |
245 | return &pool->events[offset]; | |
246 | } | |
247 | } | |
248 | ||
249 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
250 | return NULL; | |
251 | } | |
252 | ||
253 | /** | |
254 | * init_event_struct: Initialize fields in an event struct that are always | |
255 | * required. | |
256 | * @evt: The event | |
257 | * @done: Routine to call when the event is responded to | |
258 | * @format: SRP or MAD format | |
259 | * @timeout: timeout value set in the CRQ | |
260 | */ | |
261 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
262 | void (*done) (struct srp_event_struct *), | |
263 | u8 format, | |
264 | int timeout) | |
265 | { | |
266 | evt_struct->cmnd = NULL; | |
267 | evt_struct->cmnd_done = NULL; | |
268 | evt_struct->sync_srp = NULL; | |
269 | evt_struct->crq.format = format; | |
270 | evt_struct->crq.timeout = timeout; | |
271 | evt_struct->done = done; | |
272 | } | |
273 | ||
274 | /* ------------------------------------------------------------ | |
275 | * Routines for receiving SCSI responses from the hosting partition | |
276 | */ | |
277 | ||
278 | /** | |
279 | * set_srp_direction: Set the fields in the srp related to data | |
280 | * direction and number of buffers based on the direction in | |
281 | * the scsi_cmnd and the number of buffers | |
282 | */ | |
283 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
284 | struct srp_cmd *srp_cmd, | |
285 | int numbuf) | |
286 | { | |
ef265673 FT |
287 | u8 fmt; |
288 | ||
1da177e4 LT |
289 | if (numbuf == 0) |
290 | return; | |
291 | ||
ef265673 FT |
292 | if (numbuf == 1) |
293 | fmt = SRP_DATA_DESC_DIRECT; | |
294 | else { | |
295 | fmt = SRP_DATA_DESC_INDIRECT; | |
296 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
297 | ||
1da177e4 | 298 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
299 | srp_cmd->data_out_desc_cnt = numbuf; |
300 | else | |
301 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 302 | } |
ef265673 FT |
303 | |
304 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
305 | srp_cmd->buf_fmt = fmt << 4; | |
306 | else | |
307 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
308 | } |
309 | ||
ef265673 | 310 | static void unmap_sg_list(int num_entries, |
4dddbc26 | 311 | struct device *dev, |
ef265673 FT |
312 | struct srp_direct_buf *md) |
313 | { | |
4dddbc26 JB |
314 | int i; |
315 | ||
ef265673 FT |
316 | for (i = 0; i < num_entries; ++i) |
317 | dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL); | |
4dddbc26 JB |
318 | } |
319 | ||
1da177e4 LT |
320 | /** |
321 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
322 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
323 | * @dev: device for which the memory is mapped | |
324 | * | |
325 | */ | |
4dddbc26 JB |
326 | static void unmap_cmd_data(struct srp_cmd *cmd, |
327 | struct srp_event_struct *evt_struct, | |
328 | struct device *dev) | |
1da177e4 | 329 | { |
ef265673 FT |
330 | u8 out_fmt, in_fmt; |
331 | ||
332 | out_fmt = cmd->buf_fmt >> 4; | |
333 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
334 | ||
335 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 336 | return; |
ef265673 FT |
337 | else if (out_fmt == SRP_DATA_DESC_DIRECT || |
338 | in_fmt == SRP_DATA_DESC_DIRECT) { | |
339 | struct srp_direct_buf *data = | |
340 | (struct srp_direct_buf *) cmd->add_data; | |
341 | dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL); | |
1da177e4 | 342 | } else { |
ef265673 FT |
343 | struct srp_indirect_buf *indirect = |
344 | (struct srp_indirect_buf *) cmd->add_data; | |
345 | int num_mapped = indirect->table_desc.len / | |
346 | sizeof(struct srp_direct_buf); | |
4dddbc26 JB |
347 | |
348 | if (num_mapped <= MAX_INDIRECT_BUFS) { | |
ef265673 | 349 | unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]); |
4dddbc26 | 350 | return; |
1da177e4 | 351 | } |
4dddbc26 JB |
352 | |
353 | unmap_sg_list(num_mapped, dev, evt_struct->ext_list); | |
1da177e4 LT |
354 | } |
355 | } | |
356 | ||
4dddbc26 JB |
357 | static int map_sg_list(int num_entries, |
358 | struct scatterlist *sg, | |
ef265673 | 359 | struct srp_direct_buf *md) |
4dddbc26 JB |
360 | { |
361 | int i; | |
362 | u64 total_length = 0; | |
363 | ||
364 | for (i = 0; i < num_entries; ++i) { | |
ef265673 | 365 | struct srp_direct_buf *descr = md + i; |
4dddbc26 | 366 | struct scatterlist *sg_entry = &sg[i]; |
ef265673 FT |
367 | descr->va = sg_dma_address(sg_entry); |
368 | descr->len = sg_dma_len(sg_entry); | |
369 | descr->key = 0; | |
4dddbc26 JB |
370 | total_length += sg_dma_len(sg_entry); |
371 | } | |
372 | return total_length; | |
373 | } | |
374 | ||
1da177e4 LT |
375 | /** |
376 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
377 | * @cmd: Scsi_Cmnd with the scatterlist | |
378 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
379 | * @dev: device for which to map dma memory | |
380 | * | |
381 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
382 | * Returns 1 on success. | |
383 | */ | |
384 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 385 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
386 | struct srp_cmd *srp_cmd, struct device *dev) |
387 | { | |
388 | ||
4dddbc26 | 389 | int sg_mapped; |
1da177e4 LT |
390 | u64 total_length = 0; |
391 | struct scatterlist *sg = cmd->request_buffer; | |
ef265673 FT |
392 | struct srp_direct_buf *data = |
393 | (struct srp_direct_buf *) srp_cmd->add_data; | |
394 | struct srp_indirect_buf *indirect = | |
395 | (struct srp_indirect_buf *) data; | |
1da177e4 LT |
396 | |
397 | sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL); | |
398 | ||
399 | if (sg_mapped == 0) | |
400 | return 0; | |
401 | ||
402 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
403 | ||
404 | /* special case; we can use a single direct descriptor */ | |
405 | if (sg_mapped == 1) { | |
ef265673 FT |
406 | data->va = sg_dma_address(&sg[0]); |
407 | data->len = sg_dma_len(&sg[0]); | |
408 | data->key = 0; | |
1da177e4 LT |
409 | return 1; |
410 | } | |
411 | ||
4dddbc26 | 412 | if (sg_mapped > SG_ALL) { |
1da177e4 LT |
413 | printk(KERN_ERR |
414 | "ibmvscsi: More than %d mapped sg entries, got %d\n", | |
4dddbc26 | 415 | SG_ALL, sg_mapped); |
1da177e4 LT |
416 | return 0; |
417 | } | |
418 | ||
ef265673 FT |
419 | indirect->table_desc.va = 0; |
420 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); | |
421 | indirect->table_desc.key = 0; | |
4dddbc26 JB |
422 | |
423 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
ef265673 FT |
424 | total_length = map_sg_list(sg_mapped, sg, |
425 | &indirect->desc_list[0]); | |
426 | indirect->len = total_length; | |
4dddbc26 | 427 | return 1; |
1da177e4 | 428 | } |
1da177e4 | 429 | |
4dddbc26 JB |
430 | /* get indirect table */ |
431 | if (!evt_struct->ext_list) { | |
ef265673 | 432 | evt_struct->ext_list = (struct srp_direct_buf *) |
4dddbc26 | 433 | dma_alloc_coherent(dev, |
ef265673 FT |
434 | SG_ALL * sizeof(struct srp_direct_buf), |
435 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 436 | if (!evt_struct->ext_list) { |
ef265673 FT |
437 | printk(KERN_ERR |
438 | "ibmvscsi: Can't allocate memory for indirect table\n"); | |
4dddbc26 JB |
439 | return 0; |
440 | ||
441 | } | |
442 | } | |
443 | ||
444 | total_length = map_sg_list(sg_mapped, sg, evt_struct->ext_list); | |
445 | ||
ef265673 FT |
446 | indirect->len = total_length; |
447 | indirect->table_desc.va = evt_struct->ext_list_token; | |
448 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); | |
449 | memcpy(indirect->desc_list, evt_struct->ext_list, | |
450 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 JB |
451 | |
452 | return 1; | |
1da177e4 LT |
453 | } |
454 | ||
455 | /** | |
456 | * map_single_data: - Maps memory and initializes memory decriptor fields | |
457 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
458 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
459 | * @dev: device for which to map dma memory | |
460 | * | |
461 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
462 | * Returns 1 on success. | |
463 | */ | |
464 | static int map_single_data(struct scsi_cmnd *cmd, | |
465 | struct srp_cmd *srp_cmd, struct device *dev) | |
466 | { | |
ef265673 FT |
467 | struct srp_direct_buf *data = |
468 | (struct srp_direct_buf *) srp_cmd->add_data; | |
1da177e4 | 469 | |
ef265673 | 470 | data->va = |
1da177e4 LT |
471 | dma_map_single(dev, cmd->request_buffer, |
472 | cmd->request_bufflen, | |
473 | DMA_BIDIRECTIONAL); | |
ef265673 | 474 | if (dma_mapping_error(data->va)) { |
1da177e4 LT |
475 | printk(KERN_ERR |
476 | "ibmvscsi: Unable to map request_buffer for command!\n"); | |
477 | return 0; | |
478 | } | |
ef265673 FT |
479 | data->len = cmd->request_bufflen; |
480 | data->key = 0; | |
1da177e4 LT |
481 | |
482 | set_srp_direction(cmd, srp_cmd, 1); | |
483 | ||
484 | return 1; | |
485 | } | |
486 | ||
487 | /** | |
488 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
489 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
490 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
491 | * @dev: dma device for which to map dma memory | |
492 | * | |
493 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
494 | * Returns 1 on success. | |
495 | */ | |
496 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 497 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
498 | struct srp_cmd *srp_cmd, struct device *dev) |
499 | { | |
500 | switch (cmd->sc_data_direction) { | |
501 | case DMA_FROM_DEVICE: | |
502 | case DMA_TO_DEVICE: | |
503 | break; | |
504 | case DMA_NONE: | |
505 | return 1; | |
506 | case DMA_BIDIRECTIONAL: | |
507 | printk(KERN_ERR | |
508 | "ibmvscsi: Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
509 | return 0; | |
510 | default: | |
511 | printk(KERN_ERR | |
512 | "ibmvscsi: Unknown data direction 0x%02x; can't map!\n", | |
513 | cmd->sc_data_direction); | |
514 | return 0; | |
515 | } | |
516 | ||
517 | if (!cmd->request_buffer) | |
518 | return 1; | |
519 | if (cmd->use_sg) | |
4dddbc26 | 520 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
521 | return map_single_data(cmd, srp_cmd, dev); |
522 | } | |
523 | ||
524 | /* ------------------------------------------------------------ | |
525 | * Routines for sending and receiving SRPs | |
526 | */ | |
527 | /** | |
528 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
529 | * @evt_struct: evt_struct to be sent | |
530 | * @hostdata: ibmvscsi_host_data of host | |
531 | * | |
532 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
533 | * Note that this routine assumes that host_lock is held for synchronization | |
534 | */ | |
535 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
536 | struct ibmvscsi_host_data *hostdata) | |
537 | { | |
1da177e4 LT |
538 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
539 | int rc; | |
540 | ||
541 | /* If we have exhausted our request limit, just fail this request. | |
542 | * Note that there are rare cases involving driver generated requests | |
543 | * (such as task management requests) that the mid layer may think we | |
544 | * can handle more requests (can_queue) when we actually can't | |
545 | */ | |
546 | if ((evt_struct->crq.format == VIOSRP_SRP_FORMAT) && | |
2b541f8f DB |
547 | (atomic_dec_if_positive(&hostdata->request_limit) < 0)) |
548 | goto send_error; | |
1da177e4 LT |
549 | |
550 | /* Copy the IU into the transfer area */ | |
551 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 552 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
553 | |
554 | /* Add this to the sent list. We need to do this | |
555 | * before we actually send | |
556 | * in case it comes back REALLY fast | |
557 | */ | |
558 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
559 | ||
560 | if ((rc = | |
561 | ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { | |
562 | list_del(&evt_struct->list); | |
563 | ||
2b541f8f | 564 | printk(KERN_ERR "ibmvscsi: send error %d\n", |
1da177e4 LT |
565 | rc); |
566 | goto send_error; | |
567 | } | |
568 | ||
569 | return 0; | |
570 | ||
571 | send_error: | |
4dddbc26 | 572 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 573 | |
1da177e4 | 574 | free_event_struct(&hostdata->pool, evt_struct); |
2b541f8f | 575 | return SCSI_MLQUEUE_HOST_BUSY; |
1da177e4 LT |
576 | } |
577 | ||
578 | /** | |
579 | * handle_cmd_rsp: - Handle responses from commands | |
580 | * @evt_struct: srp_event_struct to be handled | |
581 | * | |
582 | * Used as a callback by when sending scsi cmds. | |
583 | * Gets called by ibmvscsi_handle_crq() | |
584 | */ | |
585 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
586 | { | |
587 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
588 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
589 | ||
ef265673 | 590 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 LT |
591 | if (printk_ratelimit()) |
592 | printk(KERN_WARNING | |
593 | "ibmvscsi: bad SRP RSP type %d\n", | |
ef265673 | 594 | rsp->opcode); |
1da177e4 LT |
595 | } |
596 | ||
597 | if (cmnd) { | |
598 | cmnd->result = rsp->status; | |
599 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) | |
600 | memcpy(cmnd->sense_buffer, | |
ef265673 FT |
601 | rsp->data, |
602 | rsp->sense_data_len); | |
1da177e4 | 603 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 604 | evt_struct, |
1da177e4 LT |
605 | evt_struct->hostdata->dev); |
606 | ||
ef265673 FT |
607 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
608 | cmnd->resid = rsp->data_out_res_cnt; | |
609 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) | |
610 | cmnd->resid = rsp->data_in_res_cnt; | |
1da177e4 LT |
611 | } |
612 | ||
613 | if (evt_struct->cmnd_done) | |
614 | evt_struct->cmnd_done(cmnd); | |
615 | } | |
616 | ||
617 | /** | |
618 | * lun_from_dev: - Returns the lun of the scsi device | |
619 | * @dev: struct scsi_device | |
620 | * | |
621 | */ | |
622 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
623 | { | |
624 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
625 | } | |
626 | ||
627 | /** | |
628 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
629 | * @cmd: struct scsi_cmnd to be executed | |
630 | * @done: Callback function to be called when cmd is completed | |
631 | */ | |
632 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, | |
633 | void (*done) (struct scsi_cmnd *)) | |
634 | { | |
635 | struct srp_cmd *srp_cmd; | |
636 | struct srp_event_struct *evt_struct; | |
ef265673 | 637 | struct srp_indirect_buf *indirect; |
1da177e4 LT |
638 | struct ibmvscsi_host_data *hostdata = |
639 | (struct ibmvscsi_host_data *)&cmnd->device->host->hostdata; | |
640 | u16 lun = lun_from_dev(cmnd->device); | |
ef265673 | 641 | u8 out_fmt, in_fmt; |
1da177e4 LT |
642 | |
643 | evt_struct = get_event_struct(&hostdata->pool); | |
644 | if (!evt_struct) | |
645 | return SCSI_MLQUEUE_HOST_BUSY; | |
646 | ||
1da177e4 LT |
647 | /* Set up the actual SRP IU */ |
648 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
649 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
650 | srp_cmd->opcode = SRP_CMD; | |
1da177e4 LT |
651 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd)); |
652 | srp_cmd->lun = ((u64) lun) << 48; | |
653 | ||
4dddbc26 | 654 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
1da177e4 LT |
655 | printk(KERN_ERR "ibmvscsi: couldn't convert cmd to srp_cmd\n"); |
656 | free_event_struct(&hostdata->pool, evt_struct); | |
657 | return SCSI_MLQUEUE_HOST_BUSY; | |
658 | } | |
659 | ||
4dddbc26 JB |
660 | init_event_struct(evt_struct, |
661 | handle_cmd_rsp, | |
662 | VIOSRP_SRP_FORMAT, | |
663 | cmnd->timeout_per_command/HZ); | |
664 | ||
665 | evt_struct->cmnd = cmnd; | |
666 | evt_struct->cmnd_done = done; | |
667 | ||
1da177e4 | 668 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
669 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
670 | out_fmt = srp_cmd->buf_fmt >> 4; | |
671 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
672 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
673 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
674 | indirect->table_desc.va == 0) { | |
675 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + | |
676 | offsetof(struct srp_cmd, add_data) + | |
677 | offsetof(struct srp_indirect_buf, desc_list); | |
1da177e4 LT |
678 | } |
679 | ||
680 | return ibmvscsi_send_srp_event(evt_struct, hostdata); | |
681 | } | |
682 | ||
683 | /* ------------------------------------------------------------ | |
684 | * Routines for driver initialization | |
685 | */ | |
686 | /** | |
687 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
688 | * @evt_struct: srp_event_struct with the response | |
689 | * | |
690 | * Used as a "done" callback by when sending adapter_info. Gets called | |
691 | * by ibmvscsi_handle_crq() | |
692 | */ | |
693 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
694 | { | |
695 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
696 | dma_unmap_single(hostdata->dev, | |
697 | evt_struct->iu.mad.adapter_info.buffer, | |
698 | evt_struct->iu.mad.adapter_info.common.length, | |
699 | DMA_BIDIRECTIONAL); | |
700 | ||
701 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
702 | printk("ibmvscsi: error %d getting adapter info\n", | |
703 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
704 | } else { | |
705 | printk("ibmvscsi: host srp version: %s, " | |
706 | "host partition %s (%d), OS %d, max io %u\n", | |
707 | hostdata->madapter_info.srp_version, | |
708 | hostdata->madapter_info.partition_name, | |
709 | hostdata->madapter_info.partition_number, | |
710 | hostdata->madapter_info.os_type, | |
711 | hostdata->madapter_info.port_max_txu[0]); | |
712 | ||
713 | if (hostdata->madapter_info.port_max_txu[0]) | |
714 | hostdata->host->max_sectors = | |
715 | hostdata->madapter_info.port_max_txu[0] >> 9; | |
154fb614 DB |
716 | |
717 | if (hostdata->madapter_info.os_type == 3 && | |
718 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { | |
719 | printk("ibmvscsi: host (Ver. %s) doesn't support large" | |
720 | "transfers\n", | |
721 | hostdata->madapter_info.srp_version); | |
722 | printk("ibmvscsi: limiting scatterlists to %d\n", | |
723 | MAX_INDIRECT_BUFS); | |
724 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; | |
725 | } | |
1da177e4 LT |
726 | } |
727 | } | |
728 | ||
729 | /** | |
730 | * send_mad_adapter_info: - Sends the mad adapter info request | |
731 | * and stores the result so it can be retrieved with | |
732 | * sysfs. We COULD consider causing a failure if the | |
733 | * returned SRP version doesn't match ours. | |
734 | * @hostdata: ibmvscsi_host_data of host | |
735 | * | |
736 | * Returns zero if successful. | |
737 | */ | |
738 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
739 | { | |
740 | struct viosrp_adapter_info *req; | |
741 | struct srp_event_struct *evt_struct; | |
742 | ||
1da177e4 LT |
743 | evt_struct = get_event_struct(&hostdata->pool); |
744 | if (!evt_struct) { | |
745 | printk(KERN_ERR "ibmvscsi: couldn't allocate an event " | |
746 | "for ADAPTER_INFO_REQ!\n"); | |
747 | return; | |
748 | } | |
749 | ||
750 | init_event_struct(evt_struct, | |
751 | adapter_info_rsp, | |
752 | VIOSRP_MAD_FORMAT, | |
753 | init_timeout * HZ); | |
754 | ||
755 | req = &evt_struct->iu.mad.adapter_info; | |
756 | memset(req, 0x00, sizeof(*req)); | |
757 | ||
758 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; | |
759 | req->common.length = sizeof(hostdata->madapter_info); | |
760 | req->buffer = dma_map_single(hostdata->dev, | |
761 | &hostdata->madapter_info, | |
762 | sizeof(hostdata->madapter_info), | |
763 | DMA_BIDIRECTIONAL); | |
764 | ||
765 | if (dma_mapping_error(req->buffer)) { | |
766 | printk(KERN_ERR | |
767 | "ibmvscsi: Unable to map request_buffer " | |
768 | "for adapter_info!\n"); | |
769 | free_event_struct(&hostdata->pool, evt_struct); | |
770 | return; | |
771 | } | |
772 | ||
773 | if (ibmvscsi_send_srp_event(evt_struct, hostdata)) | |
774 | printk(KERN_ERR "ibmvscsi: couldn't send ADAPTER_INFO_REQ!\n"); | |
775 | }; | |
776 | ||
777 | /** | |
778 | * login_rsp: - Handle response to SRP login request | |
779 | * @evt_struct: srp_event_struct with the response | |
780 | * | |
781 | * Used as a "done" callback by when sending srp_login. Gets called | |
782 | * by ibmvscsi_handle_crq() | |
783 | */ | |
784 | static void login_rsp(struct srp_event_struct *evt_struct) | |
785 | { | |
786 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
ef265673 FT |
787 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { |
788 | case SRP_LOGIN_RSP: /* it worked! */ | |
1da177e4 | 789 | break; |
ef265673 | 790 | case SRP_LOGIN_REJ: /* refused! */ |
2b541f8f DB |
791 | printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REJ reason %u\n", |
792 | evt_struct->xfer_iu->srp.login_rej.reason); | |
1da177e4 LT |
793 | /* Login failed. */ |
794 | atomic_set(&hostdata->request_limit, -1); | |
795 | return; | |
796 | default: | |
797 | printk(KERN_ERR | |
798 | "ibmvscsi: Invalid login response typecode 0x%02x!\n", | |
ef265673 | 799 | evt_struct->xfer_iu->srp.login_rsp.opcode); |
1da177e4 LT |
800 | /* Login failed. */ |
801 | atomic_set(&hostdata->request_limit, -1); | |
802 | return; | |
803 | } | |
804 | ||
805 | printk(KERN_INFO "ibmvscsi: SRP_LOGIN succeeded\n"); | |
806 | ||
ef265673 | 807 | if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta > |
1da177e4 | 808 | (max_requests - 2)) |
ef265673 | 809 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta = |
1da177e4 LT |
810 | max_requests - 2; |
811 | ||
812 | /* Now we know what the real request-limit is */ | |
813 | atomic_set(&hostdata->request_limit, | |
ef265673 | 814 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); |
1da177e4 LT |
815 | |
816 | hostdata->host->can_queue = | |
ef265673 | 817 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta - 2; |
1da177e4 LT |
818 | |
819 | if (hostdata->host->can_queue < 1) { | |
820 | printk(KERN_ERR "ibmvscsi: Invalid request_limit_delta\n"); | |
821 | return; | |
822 | } | |
823 | ||
2b541f8f DB |
824 | /* If we had any pending I/Os, kick them */ |
825 | scsi_unblock_requests(hostdata->host); | |
826 | ||
1da177e4 LT |
827 | send_mad_adapter_info(hostdata); |
828 | return; | |
829 | } | |
830 | ||
831 | /** | |
832 | * send_srp_login: - Sends the srp login | |
833 | * @hostdata: ibmvscsi_host_data of host | |
834 | * | |
835 | * Returns zero if successful. | |
836 | */ | |
837 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
838 | { | |
839 | int rc; | |
840 | unsigned long flags; | |
841 | struct srp_login_req *login; | |
842 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
843 | if (!evt_struct) { | |
844 | printk(KERN_ERR | |
845 | "ibmvscsi: couldn't allocate an event for login req!\n"); | |
846 | return FAILED; | |
847 | } | |
848 | ||
849 | init_event_struct(evt_struct, | |
850 | login_rsp, | |
851 | VIOSRP_SRP_FORMAT, | |
852 | init_timeout * HZ); | |
853 | ||
854 | login = &evt_struct->iu.srp.login_req; | |
2b541f8f | 855 | memset(login, 0x00, sizeof(struct srp_login_req)); |
ef265673 FT |
856 | login->opcode = SRP_LOGIN_REQ; |
857 | login->req_it_iu_len = sizeof(union srp_iu); | |
858 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; | |
1da177e4 | 859 | |
9b833e42 | 860 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
861 | /* Start out with a request limit of 1, since this is negotiated in |
862 | * the login request we are just sending | |
863 | */ | |
864 | atomic_set(&hostdata->request_limit, 1); | |
865 | ||
1da177e4 LT |
866 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata); |
867 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
9b833e42 | 868 | printk("ibmvscsic: sent SRP login\n"); |
1da177e4 LT |
869 | return rc; |
870 | }; | |
871 | ||
872 | /** | |
873 | * sync_completion: Signal that a synchronous command has completed | |
874 | * Note that after returning from this call, the evt_struct is freed. | |
875 | * the caller waiting on this completion shouldn't touch the evt_struct | |
876 | * again. | |
877 | */ | |
878 | static void sync_completion(struct srp_event_struct *evt_struct) | |
879 | { | |
880 | /* copy the response back */ | |
881 | if (evt_struct->sync_srp) | |
882 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
883 | ||
884 | complete(&evt_struct->comp); | |
885 | } | |
886 | ||
887 | /** | |
888 | * ibmvscsi_abort: Abort a command...from scsi host template | |
889 | * send this over to the server and wait synchronously for the response | |
890 | */ | |
891 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
892 | { | |
893 | struct ibmvscsi_host_data *hostdata = | |
894 | (struct ibmvscsi_host_data *)cmd->device->host->hostdata; | |
895 | struct srp_tsk_mgmt *tsk_mgmt; | |
896 | struct srp_event_struct *evt; | |
897 | struct srp_event_struct *tmp_evt, *found_evt; | |
898 | union viosrp_iu srp_rsp; | |
899 | int rsp_rc; | |
be042f24 | 900 | unsigned long flags; |
1da177e4 LT |
901 | u16 lun = lun_from_dev(cmd->device); |
902 | ||
903 | /* First, find this command in our sent list so we can figure | |
904 | * out the correct tag | |
905 | */ | |
be042f24 | 906 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
907 | found_evt = NULL; |
908 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
909 | if (tmp_evt->cmnd == cmd) { | |
910 | found_evt = tmp_evt; | |
911 | break; | |
912 | } | |
913 | } | |
914 | ||
be042f24 DB |
915 | if (!found_evt) { |
916 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1da177e4 | 917 | return FAILED; |
be042f24 | 918 | } |
1da177e4 LT |
919 | |
920 | evt = get_event_struct(&hostdata->pool); | |
921 | if (evt == NULL) { | |
be042f24 | 922 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
923 | printk(KERN_ERR "ibmvscsi: failed to allocate abort event\n"); |
924 | return FAILED; | |
925 | } | |
926 | ||
927 | init_event_struct(evt, | |
928 | sync_completion, | |
929 | VIOSRP_SRP_FORMAT, | |
930 | init_timeout * HZ); | |
931 | ||
932 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; | |
933 | ||
934 | /* Set up an abort SRP command */ | |
935 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
ef265673 | 936 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
1da177e4 | 937 | tsk_mgmt->lun = ((u64) lun) << 48; |
ef265673 FT |
938 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; |
939 | tsk_mgmt->task_tag = (u64) found_evt; | |
1da177e4 LT |
940 | |
941 | printk(KERN_INFO "ibmvscsi: aborting command. lun 0x%lx, tag 0x%lx\n", | |
ef265673 | 942 | tsk_mgmt->lun, tsk_mgmt->task_tag); |
1da177e4 LT |
943 | |
944 | evt->sync_srp = &srp_rsp; | |
945 | init_completion(&evt->comp); | |
be042f24 DB |
946 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata); |
947 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
948 | if (rsp_rc != 0) { | |
1da177e4 LT |
949 | printk(KERN_ERR "ibmvscsi: failed to send abort() event\n"); |
950 | return FAILED; | |
951 | } | |
952 | ||
1da177e4 | 953 | wait_for_completion(&evt->comp); |
1da177e4 LT |
954 | |
955 | /* make sure we got a good response */ | |
ef265673 | 956 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 LT |
957 | if (printk_ratelimit()) |
958 | printk(KERN_WARNING | |
959 | "ibmvscsi: abort bad SRP RSP type %d\n", | |
ef265673 | 960 | srp_rsp.srp.rsp.opcode); |
1da177e4 LT |
961 | return FAILED; |
962 | } | |
963 | ||
ef265673 FT |
964 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
965 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
966 | else |
967 | rsp_rc = srp_rsp.srp.rsp.status; | |
968 | ||
969 | if (rsp_rc) { | |
970 | if (printk_ratelimit()) | |
971 | printk(KERN_WARNING | |
ef265673 | 972 | "ibmvscsi: abort code %d for task tag 0x%lx\n", |
1da177e4 | 973 | rsp_rc, |
ef265673 | 974 | tsk_mgmt->task_tag); |
1da177e4 LT |
975 | return FAILED; |
976 | } | |
977 | ||
978 | /* Because we dropped the spinlock above, it's possible | |
979 | * The event is no longer in our list. Make sure it didn't | |
980 | * complete while we were aborting | |
981 | */ | |
be042f24 | 982 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
983 | found_evt = NULL; |
984 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
985 | if (tmp_evt->cmnd == cmd) { | |
986 | found_evt = tmp_evt; | |
987 | break; | |
988 | } | |
989 | } | |
990 | ||
991 | if (found_evt == NULL) { | |
be042f24 | 992 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
993 | printk(KERN_INFO |
994 | "ibmvscsi: aborted task tag 0x%lx completed\n", | |
ef265673 | 995 | tsk_mgmt->task_tag); |
1da177e4 LT |
996 | return SUCCESS; |
997 | } | |
998 | ||
999 | printk(KERN_INFO | |
1000 | "ibmvscsi: successfully aborted task tag 0x%lx\n", | |
ef265673 | 1001 | tsk_mgmt->task_tag); |
1da177e4 LT |
1002 | |
1003 | cmd->result = (DID_ABORT << 16); | |
1004 | list_del(&found_evt->list); | |
4dddbc26 JB |
1005 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1006 | found_evt->hostdata->dev); | |
1da177e4 | 1007 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1008 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1009 | atomic_inc(&hostdata->request_limit); |
1010 | return SUCCESS; | |
1011 | } | |
1012 | ||
1013 | /** | |
1014 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1015 | * template send this over to the server and wait synchronously for the | |
1016 | * response | |
1017 | */ | |
1018 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1019 | { | |
1020 | struct ibmvscsi_host_data *hostdata = | |
1021 | (struct ibmvscsi_host_data *)cmd->device->host->hostdata; | |
1022 | ||
1023 | struct srp_tsk_mgmt *tsk_mgmt; | |
1024 | struct srp_event_struct *evt; | |
1025 | struct srp_event_struct *tmp_evt, *pos; | |
1026 | union viosrp_iu srp_rsp; | |
1027 | int rsp_rc; | |
be042f24 | 1028 | unsigned long flags; |
1da177e4 LT |
1029 | u16 lun = lun_from_dev(cmd->device); |
1030 | ||
be042f24 | 1031 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1032 | evt = get_event_struct(&hostdata->pool); |
1033 | if (evt == NULL) { | |
be042f24 | 1034 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1035 | printk(KERN_ERR "ibmvscsi: failed to allocate reset event\n"); |
1036 | return FAILED; | |
1037 | } | |
1038 | ||
1039 | init_event_struct(evt, | |
1040 | sync_completion, | |
1041 | VIOSRP_SRP_FORMAT, | |
1042 | init_timeout * HZ); | |
1043 | ||
1044 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; | |
1045 | ||
1046 | /* Set up a lun reset SRP command */ | |
1047 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
ef265673 | 1048 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
1da177e4 | 1049 | tsk_mgmt->lun = ((u64) lun) << 48; |
ef265673 | 1050 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; |
1da177e4 LT |
1051 | |
1052 | printk(KERN_INFO "ibmvscsi: resetting device. lun 0x%lx\n", | |
1053 | tsk_mgmt->lun); | |
1054 | ||
1055 | evt->sync_srp = &srp_rsp; | |
1056 | init_completion(&evt->comp); | |
be042f24 DB |
1057 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata); |
1058 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1059 | if (rsp_rc != 0) { | |
1da177e4 LT |
1060 | printk(KERN_ERR "ibmvscsi: failed to send reset event\n"); |
1061 | return FAILED; | |
1062 | } | |
1063 | ||
1da177e4 | 1064 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1065 | |
1066 | /* make sure we got a good response */ | |
ef265673 | 1067 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 LT |
1068 | if (printk_ratelimit()) |
1069 | printk(KERN_WARNING | |
1070 | "ibmvscsi: reset bad SRP RSP type %d\n", | |
ef265673 | 1071 | srp_rsp.srp.rsp.opcode); |
1da177e4 LT |
1072 | return FAILED; |
1073 | } | |
1074 | ||
ef265673 FT |
1075 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1076 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1077 | else |
1078 | rsp_rc = srp_rsp.srp.rsp.status; | |
1079 | ||
1080 | if (rsp_rc) { | |
1081 | if (printk_ratelimit()) | |
1082 | printk(KERN_WARNING | |
1083 | "ibmvscsi: reset code %d for task tag 0x%lx\n", | |
ef265673 | 1084 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1085 | return FAILED; |
1086 | } | |
1087 | ||
1088 | /* We need to find all commands for this LUN that have not yet been | |
1089 | * responded to, and fail them with DID_RESET | |
1090 | */ | |
be042f24 | 1091 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1092 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1093 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1094 | if (tmp_evt->cmnd) | |
1095 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1096 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1097 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1098 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1099 | free_event_struct(&tmp_evt->hostdata->pool, |
1100 | tmp_evt); | |
1101 | atomic_inc(&hostdata->request_limit); | |
1102 | if (tmp_evt->cmnd_done) | |
1103 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1104 | else if (tmp_evt->done) | |
1105 | tmp_evt->done(tmp_evt); | |
1106 | } | |
1107 | } | |
be042f24 | 1108 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1109 | return SUCCESS; |
1110 | } | |
1111 | ||
1112 | /** | |
1113 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
1114 | * @hostdata: the adapter | |
1115 | */ | |
2b541f8f | 1116 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) |
1da177e4 LT |
1117 | { |
1118 | struct srp_event_struct *tmp_evt, *pos; | |
1119 | unsigned long flags; | |
1120 | ||
1121 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1122 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { | |
1123 | list_del(&tmp_evt->list); | |
1124 | if (tmp_evt->cmnd) { | |
2b541f8f | 1125 | tmp_evt->cmnd->result = (error_code << 16); |
1da177e4 | 1126 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, |
4dddbc26 | 1127 | tmp_evt, |
1da177e4 LT |
1128 | tmp_evt->hostdata->dev); |
1129 | if (tmp_evt->cmnd_done) | |
1130 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1131 | } else { | |
1132 | if (tmp_evt->done) { | |
1133 | tmp_evt->done(tmp_evt); | |
1134 | } | |
1135 | } | |
1136 | free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); | |
1137 | } | |
1138 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1139 | } | |
1140 | ||
1141 | /** | |
1142 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1143 | * @crq: Command/Response queue | |
1144 | * @hostdata: ibmvscsi_host_data of host | |
1145 | * | |
1146 | */ | |
1147 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, | |
1148 | struct ibmvscsi_host_data *hostdata) | |
1149 | { | |
1150 | unsigned long flags; | |
1151 | struct srp_event_struct *evt_struct = | |
1152 | (struct srp_event_struct *)crq->IU_data_ptr; | |
1153 | switch (crq->valid) { | |
1154 | case 0xC0: /* initialization */ | |
1155 | switch (crq->format) { | |
1156 | case 0x01: /* Initialization message */ | |
1157 | printk(KERN_INFO "ibmvscsi: partner initialized\n"); | |
1158 | /* Send back a response */ | |
1159 | if (ibmvscsi_send_crq(hostdata, | |
1160 | 0xC002000000000000LL, 0) == 0) { | |
1161 | /* Now login */ | |
1162 | send_srp_login(hostdata); | |
1163 | } else { | |
1164 | printk(KERN_ERR | |
1165 | "ibmvscsi: Unable to send init rsp\n"); | |
1166 | } | |
1167 | ||
1168 | break; | |
1169 | case 0x02: /* Initialization response */ | |
1170 | printk(KERN_INFO | |
1171 | "ibmvscsi: partner initialization complete\n"); | |
1172 | ||
1173 | /* Now login */ | |
1174 | send_srp_login(hostdata); | |
1175 | break; | |
1176 | default: | |
1177 | printk(KERN_ERR "ibmvscsi: unknown crq message type\n"); | |
1178 | } | |
1179 | return; | |
2b541f8f DB |
1180 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
1181 | scsi_block_requests(hostdata->host); | |
1182 | if (crq->format == 0x06) { | |
1183 | /* We need to re-setup the interpartition connection */ | |
1184 | printk(KERN_INFO | |
1185 | "ibmvscsi: Re-enabling adapter!\n"); | |
9b833e42 | 1186 | atomic_set(&hostdata->request_limit, -1); |
2b541f8f DB |
1187 | purge_requests(hostdata, DID_REQUEUE); |
1188 | if (ibmvscsi_reenable_crq_queue(&hostdata->queue, | |
1189 | hostdata) == 0) | |
1190 | if (ibmvscsi_send_crq(hostdata, | |
1191 | 0xC001000000000000LL, 0)) | |
1192 | printk(KERN_ERR | |
1193 | "ibmvscsi: transmit error after" | |
1194 | " enable\n"); | |
1195 | } else { | |
1196 | printk(KERN_INFO | |
1197 | "ibmvscsi: Virtual adapter failed rc %d!\n", | |
1198 | crq->format); | |
1da177e4 | 1199 | |
2b541f8f DB |
1200 | atomic_set(&hostdata->request_limit, -1); |
1201 | purge_requests(hostdata, DID_ERROR); | |
1202 | ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); | |
1203 | } | |
1204 | scsi_unblock_requests(hostdata->host); | |
1da177e4 LT |
1205 | return; |
1206 | case 0x80: /* real payload */ | |
1207 | break; | |
1208 | default: | |
1209 | printk(KERN_ERR | |
1210 | "ibmvscsi: got an invalid message type 0x%02x\n", | |
1211 | crq->valid); | |
1212 | return; | |
1213 | } | |
1214 | ||
1215 | /* The only kind of payload CRQs we should get are responses to | |
1216 | * things we send. Make sure this response is to something we | |
1217 | * actually sent | |
1218 | */ | |
1219 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
1220 | printk(KERN_ERR | |
1221 | "ibmvscsi: returned correlation_token 0x%p is invalid!\n", | |
1222 | (void *)crq->IU_data_ptr); | |
1223 | return; | |
1224 | } | |
1225 | ||
1226 | if (atomic_read(&evt_struct->free)) { | |
1227 | printk(KERN_ERR | |
1228 | "ibmvscsi: received duplicate correlation_token 0x%p!\n", | |
1229 | (void *)crq->IU_data_ptr); | |
1230 | return; | |
1231 | } | |
1232 | ||
1233 | if (crq->format == VIOSRP_SRP_FORMAT) | |
ef265673 | 1234 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
1da177e4 LT |
1235 | &hostdata->request_limit); |
1236 | ||
1237 | if (evt_struct->done) | |
1238 | evt_struct->done(evt_struct); | |
1239 | else | |
1240 | printk(KERN_ERR | |
1241 | "ibmvscsi: returned done() is NULL; not running it!\n"); | |
1242 | ||
1243 | /* | |
1244 | * Lock the host_lock before messing with these structures, since we | |
1245 | * are running in a task context | |
1246 | */ | |
1247 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1248 | list_del(&evt_struct->list); | |
1249 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1250 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * ibmvscsi_get_host_config: Send the command to the server to get host | |
1255 | * configuration data. The data is opaque to us. | |
1256 | */ | |
1257 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, | |
1258 | unsigned char *buffer, int length) | |
1259 | { | |
1260 | struct viosrp_host_config *host_config; | |
1261 | struct srp_event_struct *evt_struct; | |
1262 | int rc; | |
1263 | ||
1264 | evt_struct = get_event_struct(&hostdata->pool); | |
1265 | if (!evt_struct) { | |
1266 | printk(KERN_ERR | |
1267 | "ibmvscsi: could't allocate event for HOST_CONFIG!\n"); | |
1268 | return -1; | |
1269 | } | |
1270 | ||
1271 | init_event_struct(evt_struct, | |
1272 | sync_completion, | |
1273 | VIOSRP_MAD_FORMAT, | |
1274 | init_timeout * HZ); | |
1275 | ||
1276 | host_config = &evt_struct->iu.mad.host_config; | |
1277 | ||
1278 | /* Set up a lun reset SRP command */ | |
1279 | memset(host_config, 0x00, sizeof(*host_config)); | |
1280 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; | |
1281 | host_config->common.length = length; | |
1282 | host_config->buffer = dma_map_single(hostdata->dev, buffer, length, | |
1283 | DMA_BIDIRECTIONAL); | |
1284 | ||
1285 | if (dma_mapping_error(host_config->buffer)) { | |
1286 | printk(KERN_ERR | |
1287 | "ibmvscsi: dma_mapping error " "getting host config\n"); | |
1288 | free_event_struct(&hostdata->pool, evt_struct); | |
1289 | return -1; | |
1290 | } | |
1291 | ||
1292 | init_completion(&evt_struct->comp); | |
1293 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata); | |
1294 | if (rc == 0) { | |
1295 | wait_for_completion(&evt_struct->comp); | |
1296 | dma_unmap_single(hostdata->dev, host_config->buffer, | |
1297 | length, DMA_BIDIRECTIONAL); | |
1298 | } | |
1299 | ||
1300 | return rc; | |
1301 | } | |
1302 | ||
1303 | /* ------------------------------------------------------------ | |
1304 | * sysfs attributes | |
1305 | */ | |
1306 | static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf) | |
1307 | { | |
1308 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1309 | struct ibmvscsi_host_data *hostdata = | |
1310 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1311 | int len; | |
1312 | ||
1313 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1314 | hostdata->madapter_info.srp_version); | |
1315 | return len; | |
1316 | } | |
1317 | ||
1318 | static struct class_device_attribute ibmvscsi_host_srp_version = { | |
1319 | .attr = { | |
1320 | .name = "srp_version", | |
1321 | .mode = S_IRUGO, | |
1322 | }, | |
1323 | .show = show_host_srp_version, | |
1324 | }; | |
1325 | ||
1326 | static ssize_t show_host_partition_name(struct class_device *class_dev, | |
1327 | char *buf) | |
1328 | { | |
1329 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1330 | struct ibmvscsi_host_data *hostdata = | |
1331 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1332 | int len; | |
1333 | ||
1334 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1335 | hostdata->madapter_info.partition_name); | |
1336 | return len; | |
1337 | } | |
1338 | ||
1339 | static struct class_device_attribute ibmvscsi_host_partition_name = { | |
1340 | .attr = { | |
1341 | .name = "partition_name", | |
1342 | .mode = S_IRUGO, | |
1343 | }, | |
1344 | .show = show_host_partition_name, | |
1345 | }; | |
1346 | ||
1347 | static ssize_t show_host_partition_number(struct class_device *class_dev, | |
1348 | char *buf) | |
1349 | { | |
1350 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1351 | struct ibmvscsi_host_data *hostdata = | |
1352 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1353 | int len; | |
1354 | ||
1355 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1356 | hostdata->madapter_info.partition_number); | |
1357 | return len; | |
1358 | } | |
1359 | ||
1360 | static struct class_device_attribute ibmvscsi_host_partition_number = { | |
1361 | .attr = { | |
1362 | .name = "partition_number", | |
1363 | .mode = S_IRUGO, | |
1364 | }, | |
1365 | .show = show_host_partition_number, | |
1366 | }; | |
1367 | ||
1368 | static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf) | |
1369 | { | |
1370 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1371 | struct ibmvscsi_host_data *hostdata = | |
1372 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1373 | int len; | |
1374 | ||
1375 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1376 | hostdata->madapter_info.mad_version); | |
1377 | return len; | |
1378 | } | |
1379 | ||
1380 | static struct class_device_attribute ibmvscsi_host_mad_version = { | |
1381 | .attr = { | |
1382 | .name = "mad_version", | |
1383 | .mode = S_IRUGO, | |
1384 | }, | |
1385 | .show = show_host_mad_version, | |
1386 | }; | |
1387 | ||
1388 | static ssize_t show_host_os_type(struct class_device *class_dev, char *buf) | |
1389 | { | |
1390 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1391 | struct ibmvscsi_host_data *hostdata = | |
1392 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1393 | int len; | |
1394 | ||
1395 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); | |
1396 | return len; | |
1397 | } | |
1398 | ||
1399 | static struct class_device_attribute ibmvscsi_host_os_type = { | |
1400 | .attr = { | |
1401 | .name = "os_type", | |
1402 | .mode = S_IRUGO, | |
1403 | }, | |
1404 | .show = show_host_os_type, | |
1405 | }; | |
1406 | ||
1407 | static ssize_t show_host_config(struct class_device *class_dev, char *buf) | |
1408 | { | |
1409 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
1410 | struct ibmvscsi_host_data *hostdata = | |
1411 | (struct ibmvscsi_host_data *)shost->hostdata; | |
1412 | ||
1413 | /* returns null-terminated host config data */ | |
1414 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) | |
1415 | return strlen(buf); | |
1416 | else | |
1417 | return 0; | |
1418 | } | |
1419 | ||
1420 | static struct class_device_attribute ibmvscsi_host_config = { | |
1421 | .attr = { | |
1422 | .name = "config", | |
1423 | .mode = S_IRUGO, | |
1424 | }, | |
1425 | .show = show_host_config, | |
1426 | }; | |
1427 | ||
1428 | static struct class_device_attribute *ibmvscsi_attrs[] = { | |
1429 | &ibmvscsi_host_srp_version, | |
1430 | &ibmvscsi_host_partition_name, | |
1431 | &ibmvscsi_host_partition_number, | |
1432 | &ibmvscsi_host_mad_version, | |
1433 | &ibmvscsi_host_os_type, | |
1434 | &ibmvscsi_host_config, | |
1435 | NULL | |
1436 | }; | |
1437 | ||
1438 | /* ------------------------------------------------------------ | |
1439 | * SCSI driver registration | |
1440 | */ | |
1441 | static struct scsi_host_template driver_template = { | |
1442 | .module = THIS_MODULE, | |
1443 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
1444 | .proc_name = "ibmvscsi", | |
1445 | .queuecommand = ibmvscsi_queuecommand, | |
1446 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
1447 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
1448 | .cmd_per_lun = 16, | |
1449 | .can_queue = 1, /* Updated after SRP_LOGIN */ | |
1450 | .this_id = -1, | |
4dddbc26 | 1451 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
1452 | .use_clustering = ENABLE_CLUSTERING, |
1453 | .shost_attrs = ibmvscsi_attrs, | |
1454 | }; | |
1455 | ||
1456 | /** | |
1457 | * Called by bus code for each adapter | |
1458 | */ | |
1459 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
1460 | { | |
1461 | struct ibmvscsi_host_data *hostdata; | |
1462 | struct Scsi_Host *host; | |
1463 | struct device *dev = &vdev->dev; | |
1464 | unsigned long wait_switch = 0; | |
1465 | ||
1466 | vdev->dev.driver_data = NULL; | |
1467 | ||
1468 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
1469 | if (!host) { | |
1470 | printk(KERN_ERR "ibmvscsi: couldn't allocate host data\n"); | |
1471 | goto scsi_host_alloc_failed; | |
1472 | } | |
1473 | ||
1474 | hostdata = (struct ibmvscsi_host_data *)host->hostdata; | |
1475 | memset(hostdata, 0x00, sizeof(*hostdata)); | |
1476 | INIT_LIST_HEAD(&hostdata->sent); | |
1477 | hostdata->host = host; | |
1478 | hostdata->dev = dev; | |
1479 | atomic_set(&hostdata->request_limit, -1); | |
1480 | hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */ | |
1481 | ||
1482 | if (ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, | |
1483 | max_requests) != 0) { | |
1484 | printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n"); | |
1485 | goto init_crq_failed; | |
1486 | } | |
1487 | if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) { | |
1488 | printk(KERN_ERR "ibmvscsi: couldn't initialize event pool\n"); | |
1489 | goto init_pool_failed; | |
1490 | } | |
1491 | ||
1492 | host->max_lun = 8; | |
1493 | host->max_id = max_id; | |
1494 | host->max_channel = max_channel; | |
1495 | ||
1496 | if (scsi_add_host(hostdata->host, hostdata->dev)) | |
1497 | goto add_host_failed; | |
1498 | ||
1499 | /* Try to send an initialization message. Note that this is allowed | |
1500 | * to fail if the other end is not acive. In that case we don't | |
1501 | * want to scan | |
1502 | */ | |
1503 | if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0) { | |
1504 | /* | |
1505 | * Wait around max init_timeout secs for the adapter to finish | |
1506 | * initializing. When we are done initializing, we will have a | |
1507 | * valid request_limit. We don't want Linux scanning before | |
1508 | * we are ready. | |
1509 | */ | |
1510 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1511 | time_before(jiffies, wait_switch) && | |
1512 | atomic_read(&hostdata->request_limit) < 2;) { | |
1513 | ||
1514 | msleep(10); | |
1515 | } | |
1516 | ||
1517 | /* if we now have a valid request_limit, initiate a scan */ | |
1518 | if (atomic_read(&hostdata->request_limit) > 0) | |
1519 | scsi_scan_host(host); | |
1520 | } | |
1521 | ||
1522 | vdev->dev.driver_data = hostdata; | |
1523 | return 0; | |
1524 | ||
1525 | add_host_failed: | |
1526 | release_event_pool(&hostdata->pool, hostdata); | |
1527 | init_pool_failed: | |
1528 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests); | |
1529 | init_crq_failed: | |
1530 | scsi_host_put(host); | |
1531 | scsi_host_alloc_failed: | |
1532 | return -1; | |
1533 | } | |
1534 | ||
1535 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
1536 | { | |
1537 | struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data; | |
1538 | release_event_pool(&hostdata->pool, hostdata); | |
1539 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, | |
1540 | max_requests); | |
1541 | ||
1542 | scsi_remove_host(hostdata->host); | |
1543 | scsi_host_put(hostdata->host); | |
1544 | ||
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | /** | |
1549 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
1550 | * support. | |
1551 | */ | |
1552 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { | |
1553 | {"vscsi", "IBM,v-scsi"}, | |
fb120da6 | 1554 | { "", "" } |
1da177e4 | 1555 | }; |
1da177e4 | 1556 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 1557 | |
1da177e4 | 1558 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
1559 | .id_table = ibmvscsi_device_table, |
1560 | .probe = ibmvscsi_probe, | |
6fdf5392 SR |
1561 | .remove = ibmvscsi_remove, |
1562 | .driver = { | |
1563 | .name = "ibmvscsi", | |
915124d8 | 1564 | .owner = THIS_MODULE, |
6fdf5392 | 1565 | } |
1da177e4 LT |
1566 | }; |
1567 | ||
1568 | int __init ibmvscsi_module_init(void) | |
1569 | { | |
1570 | return vio_register_driver(&ibmvscsi_driver); | |
1571 | } | |
1572 | ||
1573 | void __exit ibmvscsi_module_exit(void) | |
1574 | { | |
1575 | vio_unregister_driver(&ibmvscsi_driver); | |
1576 | } | |
1577 | ||
1578 | module_init(ibmvscsi_module_init); | |
1579 | module_exit(ibmvscsi_module_exit); |