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1da177e4 LT |
1 | /* |
2 | * hosts.c Copyright (C) 1992 Drew Eckhardt | |
3 | * Copyright (C) 1993, 1994, 1995 Eric Youngdale | |
4 | * Copyright (C) 2002-2003 Christoph Hellwig | |
5 | * | |
6 | * mid to lowlevel SCSI driver interface | |
7 | * Initial versions: Drew Eckhardt | |
8 | * Subsequent revisions: Eric Youngdale | |
9 | * | |
10 | * <drew@colorado.edu> | |
11 | * | |
12 | * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli | |
13 | * Added QLOGIC QLA1280 SCSI controller kernel host support. | |
14 | * August 4, 1999 Fred Lewis, Intel DuPont | |
15 | * | |
16 | * Updated to reflect the new initialization scheme for the higher | |
17 | * level of scsi drivers (sd/sr/st) | |
18 | * September 17, 2000 Torben Mathiasen <tmm@image.dk> | |
19 | * | |
20 | * Restructured scsi_host lists and associated functions. | |
21 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/blkdev.h> | |
26 | #include <linux/kernel.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
c5478def | 28 | #include <linux/kthread.h> |
1da177e4 LT |
29 | #include <linux/string.h> |
30 | #include <linux/mm.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/completion.h> | |
33 | #include <linux/transport_class.h> | |
d052d1be | 34 | #include <linux/platform_device.h> |
bc4f2401 | 35 | #include <linux/pm_runtime.h> |
126a4fe0 | 36 | #include <linux/idr.h> |
1da177e4 LT |
37 | #include <scsi/scsi_device.h> |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_transport.h> | |
40 | ||
41 | #include "scsi_priv.h" | |
42 | #include "scsi_logging.h" | |
43 | ||
44 | ||
126a4fe0 | 45 | static DEFINE_IDA(host_index_ida); |
1da177e4 LT |
46 | |
47 | ||
ee959b00 | 48 | static void scsi_host_cls_release(struct device *dev) |
1da177e4 | 49 | { |
ee959b00 | 50 | put_device(&class_to_shost(dev)->shost_gendev); |
1da177e4 LT |
51 | } |
52 | ||
53 | static struct class shost_class = { | |
54 | .name = "scsi_host", | |
ee959b00 | 55 | .dev_release = scsi_host_cls_release, |
1da177e4 LT |
56 | }; |
57 | ||
d3301874 | 58 | /** |
eb44820c | 59 | * scsi_host_set_state - Take the given host through the host state model. |
d3301874 MA |
60 | * @shost: scsi host to change the state of. |
61 | * @state: state to change to. | |
62 | * | |
63 | * Returns zero if unsuccessful or an error if the requested | |
64 | * transition is illegal. | |
65 | **/ | |
66 | int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state) | |
67 | { | |
68 | enum scsi_host_state oldstate = shost->shost_state; | |
69 | ||
70 | if (state == oldstate) | |
71 | return 0; | |
72 | ||
73 | switch (state) { | |
74 | case SHOST_CREATED: | |
75 | /* There are no legal states that come back to | |
76 | * created. This is the manually initialised start | |
77 | * state */ | |
78 | goto illegal; | |
79 | ||
80 | case SHOST_RUNNING: | |
81 | switch (oldstate) { | |
82 | case SHOST_CREATED: | |
83 | case SHOST_RECOVERY: | |
84 | break; | |
85 | default: | |
86 | goto illegal; | |
87 | } | |
88 | break; | |
89 | ||
90 | case SHOST_RECOVERY: | |
91 | switch (oldstate) { | |
92 | case SHOST_RUNNING: | |
93 | break; | |
94 | default: | |
95 | goto illegal; | |
96 | } | |
97 | break; | |
98 | ||
99 | case SHOST_CANCEL: | |
100 | switch (oldstate) { | |
101 | case SHOST_CREATED: | |
102 | case SHOST_RUNNING: | |
939647ee | 103 | case SHOST_CANCEL_RECOVERY: |
d3301874 MA |
104 | break; |
105 | default: | |
106 | goto illegal; | |
107 | } | |
108 | break; | |
109 | ||
110 | case SHOST_DEL: | |
111 | switch (oldstate) { | |
112 | case SHOST_CANCEL: | |
939647ee | 113 | case SHOST_DEL_RECOVERY: |
d3301874 MA |
114 | break; |
115 | default: | |
116 | goto illegal; | |
117 | } | |
118 | break; | |
119 | ||
939647ee JB |
120 | case SHOST_CANCEL_RECOVERY: |
121 | switch (oldstate) { | |
122 | case SHOST_CANCEL: | |
123 | case SHOST_RECOVERY: | |
124 | break; | |
125 | default: | |
126 | goto illegal; | |
127 | } | |
128 | break; | |
129 | ||
130 | case SHOST_DEL_RECOVERY: | |
131 | switch (oldstate) { | |
132 | case SHOST_CANCEL_RECOVERY: | |
133 | break; | |
134 | default: | |
135 | goto illegal; | |
136 | } | |
137 | break; | |
d3301874 MA |
138 | } |
139 | shost->shost_state = state; | |
140 | return 0; | |
141 | ||
142 | illegal: | |
143 | SCSI_LOG_ERROR_RECOVERY(1, | |
9ccfc756 JB |
144 | shost_printk(KERN_ERR, shost, |
145 | "Illegal host state transition" | |
146 | "%s->%s\n", | |
147 | scsi_host_state_name(oldstate), | |
148 | scsi_host_state_name(state))); | |
d3301874 MA |
149 | return -EINVAL; |
150 | } | |
151 | EXPORT_SYMBOL(scsi_host_set_state); | |
152 | ||
1da177e4 LT |
153 | /** |
154 | * scsi_remove_host - remove a scsi host | |
155 | * @shost: a pointer to a scsi host to remove | |
156 | **/ | |
157 | void scsi_remove_host(struct Scsi_Host *shost) | |
158 | { | |
939647ee | 159 | unsigned long flags; |
bc4f2401 | 160 | |
0b950672 | 161 | mutex_lock(&shost->scan_mutex); |
939647ee JB |
162 | spin_lock_irqsave(shost->host_lock, flags); |
163 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
164 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) { | |
165 | spin_unlock_irqrestore(shost->host_lock, flags); | |
0b950672 | 166 | mutex_unlock(&shost->scan_mutex); |
939647ee JB |
167 | return; |
168 | } | |
169 | spin_unlock_irqrestore(shost->host_lock, flags); | |
bc4f2401 AS |
170 | |
171 | scsi_autopm_get_host(shost); | |
e494f6a7 | 172 | flush_workqueue(shost->tmf_work_q); |
1da177e4 | 173 | scsi_forget_host(shost); |
4e46bf89 | 174 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
175 | scsi_proc_host_rm(shost); |
176 | ||
939647ee JB |
177 | spin_lock_irqsave(shost->host_lock, flags); |
178 | if (scsi_host_set_state(shost, SHOST_DEL)) | |
179 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY)); | |
180 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
181 | |
182 | transport_unregister_device(&shost->shost_gendev); | |
ee959b00 | 183 | device_unregister(&shost->shost_dev); |
1da177e4 LT |
184 | device_del(&shost->shost_gendev); |
185 | } | |
186 | EXPORT_SYMBOL(scsi_remove_host); | |
187 | ||
188 | /** | |
d139b9bd | 189 | * scsi_add_host_with_dma - add a scsi host with dma device |
1da177e4 LT |
190 | * @shost: scsi host pointer to add |
191 | * @dev: a struct device of type scsi class | |
d139b9bd JB |
192 | * @dma_dev: dma device for the host |
193 | * | |
194 | * Note: You rarely need to worry about this unless you're in a | |
195 | * virtualised host environments, so use the simpler scsi_add_host() | |
196 | * function instead. | |
1da177e4 LT |
197 | * |
198 | * Return value: | |
199 | * 0 on success / != 0 for error | |
200 | **/ | |
d139b9bd JB |
201 | int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, |
202 | struct device *dma_dev) | |
1da177e4 LT |
203 | { |
204 | struct scsi_host_template *sht = shost->hostt; | |
205 | int error = -EINVAL; | |
206 | ||
91921e01 | 207 | shost_printk(KERN_INFO, shost, "%s\n", |
1da177e4 LT |
208 | sht->info ? sht->info(shost) : sht->name); |
209 | ||
210 | if (!shost->can_queue) { | |
91921e01 HR |
211 | shost_printk(KERN_ERR, shost, |
212 | "can_queue = 0 no longer supported\n"); | |
542bd137 | 213 | goto fail; |
1da177e4 LT |
214 | } |
215 | ||
0a6ac4ee CH |
216 | error = scsi_init_sense_cache(shost); |
217 | if (error) | |
218 | goto fail; | |
219 | ||
d285203c CH |
220 | if (shost_use_blk_mq(shost)) { |
221 | error = scsi_mq_setup_tags(shost); | |
222 | if (error) | |
223 | goto fail; | |
64d513ac CH |
224 | } else { |
225 | shost->bqt = blk_init_tags(shost->can_queue, | |
226 | shost->hostt->tag_alloc_policy); | |
227 | if (!shost->bqt) { | |
228 | error = -ENOMEM; | |
229 | goto fail; | |
230 | } | |
d285203c CH |
231 | } |
232 | ||
1da177e4 LT |
233 | if (!shost->shost_gendev.parent) |
234 | shost->shost_gendev.parent = dev ? dev : &platform_bus; | |
3c8d9a95 JB |
235 | if (!dma_dev) |
236 | dma_dev = shost->shost_gendev.parent; | |
237 | ||
d139b9bd | 238 | shost->dma_dev = dma_dev; |
1da177e4 | 239 | |
5c6fab9d MW |
240 | /* |
241 | * Increase usage count temporarily here so that calling | |
242 | * scsi_autopm_put_host() will trigger runtime idle if there is | |
243 | * nothing else preventing suspending the device. | |
244 | */ | |
245 | pm_runtime_get_noresume(&shost->shost_gendev); | |
bc4f2401 AS |
246 | pm_runtime_set_active(&shost->shost_gendev); |
247 | pm_runtime_enable(&shost->shost_gendev); | |
248 | device_enable_async_suspend(&shost->shost_gendev); | |
249 | ||
0d5644b7 HK |
250 | error = device_add(&shost->shost_gendev); |
251 | if (error) | |
e9c787e6 | 252 | goto out_disable_runtime_pm; |
0d5644b7 | 253 | |
d3301874 | 254 | scsi_host_set_state(shost, SHOST_RUNNING); |
1da177e4 LT |
255 | get_device(shost->shost_gendev.parent); |
256 | ||
4cb077d9 RW |
257 | device_enable_async_suspend(&shost->shost_dev); |
258 | ||
ee959b00 | 259 | error = device_add(&shost->shost_dev); |
1da177e4 LT |
260 | if (error) |
261 | goto out_del_gendev; | |
262 | ||
263 | get_device(&shost->shost_gendev); | |
264 | ||
77cca462 JS |
265 | if (shost->transportt->host_size) { |
266 | shost->shost_data = kzalloc(shost->transportt->host_size, | |
267 | GFP_KERNEL); | |
268 | if (shost->shost_data == NULL) { | |
269 | error = -ENOMEM; | |
ee959b00 | 270 | goto out_del_dev; |
77cca462 JS |
271 | } |
272 | } | |
1da177e4 LT |
273 | |
274 | if (shost->transportt->create_work_queue) { | |
aab0de24 KS |
275 | snprintf(shost->work_q_name, sizeof(shost->work_q_name), |
276 | "scsi_wq_%d", shost->host_no); | |
1da177e4 LT |
277 | shost->work_q = create_singlethread_workqueue( |
278 | shost->work_q_name); | |
77cca462 JS |
279 | if (!shost->work_q) { |
280 | error = -EINVAL; | |
1da177e4 | 281 | goto out_free_shost_data; |
77cca462 | 282 | } |
1da177e4 LT |
283 | } |
284 | ||
285 | error = scsi_sysfs_add_host(shost); | |
286 | if (error) | |
287 | goto out_destroy_host; | |
288 | ||
289 | scsi_proc_host_add(shost); | |
5c6fab9d | 290 | scsi_autopm_put_host(shost); |
1da177e4 LT |
291 | return error; |
292 | ||
293 | out_destroy_host: | |
294 | if (shost->work_q) | |
295 | destroy_workqueue(shost->work_q); | |
296 | out_free_shost_data: | |
297 | kfree(shost->shost_data); | |
ee959b00 TJ |
298 | out_del_dev: |
299 | device_del(&shost->shost_dev); | |
1da177e4 LT |
300 | out_del_gendev: |
301 | device_del(&shost->shost_gendev); | |
e9c787e6 | 302 | out_disable_runtime_pm: |
0d5644b7 HK |
303 | device_disable_async_suspend(&shost->shost_gendev); |
304 | pm_runtime_disable(&shost->shost_gendev); | |
305 | pm_runtime_set_suspended(&shost->shost_gendev); | |
306 | pm_runtime_put_noidle(&shost->shost_gendev); | |
d285203c CH |
307 | if (shost_use_blk_mq(shost)) |
308 | scsi_mq_destroy_tags(shost); | |
542bd137 | 309 | fail: |
1da177e4 LT |
310 | return error; |
311 | } | |
d139b9bd | 312 | EXPORT_SYMBOL(scsi_add_host_with_dma); |
1da177e4 LT |
313 | |
314 | static void scsi_host_dev_release(struct device *dev) | |
315 | { | |
316 | struct Scsi_Host *shost = dev_to_shost(dev); | |
317 | struct device *parent = dev->parent; | |
318 | ||
77c01976 AS |
319 | scsi_proc_hostdir_rm(shost->hostt); |
320 | ||
e494f6a7 HR |
321 | if (shost->tmf_work_q) |
322 | destroy_workqueue(shost->tmf_work_q); | |
c5478def CH |
323 | if (shost->ehandler) |
324 | kthread_stop(shost->ehandler); | |
1da177e4 LT |
325 | if (shost->work_q) |
326 | destroy_workqueue(shost->work_q); | |
327 | ||
b49493f9 BVA |
328 | if (shost->shost_state == SHOST_CREATED) { |
329 | /* | |
330 | * Free the shost_dev device name here if scsi_host_alloc() | |
331 | * and scsi_host_put() have been called but neither | |
332 | * scsi_host_add() nor scsi_host_remove() has been called. | |
333 | * This avoids that the memory allocated for the shost_dev | |
334 | * name is leaked. | |
335 | */ | |
336 | kfree(dev_name(&shost->shost_dev)); | |
337 | } | |
338 | ||
d285203c CH |
339 | if (shost_use_blk_mq(shost)) { |
340 | if (shost->tag_set.tags) | |
341 | scsi_mq_destroy_tags(shost); | |
342 | } else { | |
343 | if (shost->bqt) | |
344 | blk_free_tags(shost->bqt); | |
345 | } | |
86e33a29 | 346 | |
1da177e4 LT |
347 | kfree(shost->shost_data); |
348 | ||
126a4fe0 LD |
349 | ida_simple_remove(&host_index_ida, shost->host_no); |
350 | ||
1da177e4 LT |
351 | if (parent) |
352 | put_device(parent); | |
353 | kfree(shost); | |
354 | } | |
355 | ||
bb3b621a | 356 | static int shost_eh_deadline = -1; |
b4562022 | 357 | |
bb3b621a | 358 | module_param_named(eh_deadline, shost_eh_deadline, int, S_IRUGO|S_IWUSR); |
b4562022 | 359 | MODULE_PARM_DESC(eh_deadline, |
bb3b621a | 360 | "SCSI EH timeout in seconds (should be between 0 and 2^31-1)"); |
b4562022 | 361 | |
453cd0f3 | 362 | static struct device_type scsi_host_type = { |
b0ed4336 HR |
363 | .name = "scsi_host", |
364 | .release = scsi_host_dev_release, | |
365 | }; | |
366 | ||
1da177e4 LT |
367 | /** |
368 | * scsi_host_alloc - register a scsi host adapter instance. | |
369 | * @sht: pointer to scsi host template | |
370 | * @privsize: extra bytes to allocate for driver | |
371 | * | |
372 | * Note: | |
373 | * Allocate a new Scsi_Host and perform basic initialization. | |
374 | * The host is not published to the scsi midlayer until scsi_add_host | |
375 | * is called. | |
376 | * | |
377 | * Return value: | |
378 | * Pointer to a new Scsi_Host | |
379 | **/ | |
380 | struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) | |
381 | { | |
382 | struct Scsi_Host *shost; | |
c53033f6 | 383 | gfp_t gfp_mask = GFP_KERNEL; |
126a4fe0 | 384 | int index; |
1da177e4 LT |
385 | |
386 | if (sht->unchecked_isa_dma && privsize) | |
387 | gfp_mask |= __GFP_DMA; | |
388 | ||
24669f75 | 389 | shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask); |
1da177e4 LT |
390 | if (!shost) |
391 | return NULL; | |
1da177e4 | 392 | |
4f777ed2 CH |
393 | shost->host_lock = &shost->default_lock; |
394 | spin_lock_init(shost->host_lock); | |
d3301874 | 395 | shost->shost_state = SHOST_CREATED; |
1da177e4 LT |
396 | INIT_LIST_HEAD(&shost->__devices); |
397 | INIT_LIST_HEAD(&shost->__targets); | |
398 | INIT_LIST_HEAD(&shost->eh_cmd_q); | |
399 | INIT_LIST_HEAD(&shost->starved_list); | |
400 | init_waitqueue_head(&shost->host_wait); | |
0b950672 | 401 | mutex_init(&shost->scan_mutex); |
1da177e4 | 402 | |
126a4fe0 LD |
403 | index = ida_simple_get(&host_index_ida, 0, 0, GFP_KERNEL); |
404 | if (index < 0) | |
405 | goto fail_kfree; | |
406 | shost->host_no = index; | |
407 | ||
1da177e4 LT |
408 | shost->dma_channel = 0xff; |
409 | ||
410 | /* These three are default values which can be overridden */ | |
411 | shost->max_channel = 0; | |
412 | shost->max_id = 8; | |
413 | shost->max_lun = 8; | |
414 | ||
415 | /* Give each shost a default transportt */ | |
416 | shost->transportt = &blank_transport_template; | |
417 | ||
418 | /* | |
419 | * All drivers right now should be able to handle 12 byte | |
420 | * commands. Every so often there are requests for 16 byte | |
421 | * commands, but individual low-level drivers need to certify that | |
422 | * they actually do something sensible with such commands. | |
423 | */ | |
424 | shost->max_cmd_len = 12; | |
425 | shost->hostt = sht; | |
426 | shost->this_id = sht->this_id; | |
427 | shost->can_queue = sht->can_queue; | |
428 | shost->sg_tablesize = sht->sg_tablesize; | |
13f05c8d | 429 | shost->sg_prot_tablesize = sht->sg_prot_tablesize; |
1da177e4 LT |
430 | shost->cmd_per_lun = sht->cmd_per_lun; |
431 | shost->unchecked_isa_dma = sht->unchecked_isa_dma; | |
432 | shost->use_clustering = sht->use_clustering; | |
54b2b50c | 433 | shost->no_write_same = sht->no_write_same; |
1da177e4 | 434 | |
ad469a57 | 435 | if (shost_eh_deadline == -1 || !sht->eh_host_reset_handler) |
bb3b621a RM |
436 | shost->eh_deadline = -1; |
437 | else if ((ulong) shost_eh_deadline * HZ > INT_MAX) { | |
438 | shost_printk(KERN_WARNING, shost, | |
439 | "eh_deadline %u too large, setting to %u\n", | |
440 | shost_eh_deadline, INT_MAX / HZ); | |
441 | shost->eh_deadline = INT_MAX; | |
442 | } else | |
443 | shost->eh_deadline = shost_eh_deadline * HZ; | |
444 | ||
7a39ac3f JB |
445 | if (sht->supported_mode == MODE_UNKNOWN) |
446 | /* means we didn't set it ... default to INITIATOR */ | |
447 | shost->active_mode = MODE_INITIATOR; | |
448 | else | |
449 | shost->active_mode = sht->supported_mode; | |
450 | ||
1da177e4 LT |
451 | if (sht->max_host_blocked) |
452 | shost->max_host_blocked = sht->max_host_blocked; | |
453 | else | |
454 | shost->max_host_blocked = SCSI_DEFAULT_HOST_BLOCKED; | |
455 | ||
456 | /* | |
457 | * If the driver imposes no hard sector transfer limit, start at | |
458 | * machine infinity initially. | |
459 | */ | |
460 | if (sht->max_sectors) | |
461 | shost->max_sectors = sht->max_sectors; | |
462 | else | |
463 | shost->max_sectors = SCSI_DEFAULT_MAX_SECTORS; | |
464 | ||
465 | /* | |
466 | * assume a 4GB boundary, if not set | |
467 | */ | |
468 | if (sht->dma_boundary) | |
469 | shost->dma_boundary = sht->dma_boundary; | |
470 | else | |
471 | shost->dma_boundary = 0xffffffff; | |
472 | ||
8d58881b BVA |
473 | shost->use_blk_mq = scsi_use_blk_mq; |
474 | ||
1da177e4 | 475 | device_initialize(&shost->shost_gendev); |
71610f55 | 476 | dev_set_name(&shost->shost_gendev, "host%d", shost->host_no); |
b0ed4336 | 477 | shost->shost_gendev.bus = &scsi_bus_type; |
b0ed4336 | 478 | shost->shost_gendev.type = &scsi_host_type; |
1da177e4 | 479 | |
ee959b00 TJ |
480 | device_initialize(&shost->shost_dev); |
481 | shost->shost_dev.parent = &shost->shost_gendev; | |
482 | shost->shost_dev.class = &shost_class; | |
71610f55 | 483 | dev_set_name(&shost->shost_dev, "host%d", shost->host_no); |
f7120a4f | 484 | shost->shost_dev.groups = scsi_sysfs_shost_attr_groups; |
1da177e4 | 485 | |
c5478def CH |
486 | shost->ehandler = kthread_run(scsi_error_handler, shost, |
487 | "scsi_eh_%d", shost->host_no); | |
488 | if (IS_ERR(shost->ehandler)) { | |
91921e01 HR |
489 | shost_printk(KERN_WARNING, shost, |
490 | "error handler thread failed to spawn, error = %ld\n", | |
491 | PTR_ERR(shost->ehandler)); | |
126a4fe0 | 492 | goto fail_index_remove; |
c5478def | 493 | } |
1da177e4 | 494 | |
e494f6a7 HR |
495 | shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d", |
496 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
497 | 1, shost->host_no); | |
498 | if (!shost->tmf_work_q) { | |
a222b1e2 HR |
499 | shost_printk(KERN_WARNING, shost, |
500 | "failed to create tmf workq\n"); | |
e494f6a7 HR |
501 | goto fail_kthread; |
502 | } | |
1da177e4 LT |
503 | scsi_proc_hostdir_add(shost->hostt); |
504 | return shost; | |
505 | ||
e494f6a7 HR |
506 | fail_kthread: |
507 | kthread_stop(shost->ehandler); | |
126a4fe0 LD |
508 | fail_index_remove: |
509 | ida_simple_remove(&host_index_ida, shost->host_no); | |
1da177e4 LT |
510 | fail_kfree: |
511 | kfree(shost); | |
512 | return NULL; | |
513 | } | |
514 | EXPORT_SYMBOL(scsi_host_alloc); | |
515 | ||
516 | struct Scsi_Host *scsi_register(struct scsi_host_template *sht, int privsize) | |
517 | { | |
518 | struct Scsi_Host *shost = scsi_host_alloc(sht, privsize); | |
519 | ||
520 | if (!sht->detect) { | |
521 | printk(KERN_WARNING "scsi_register() called on new-style " | |
522 | "template for driver %s\n", sht->name); | |
523 | dump_stack(); | |
524 | } | |
525 | ||
526 | if (shost) | |
527 | list_add_tail(&shost->sht_legacy_list, &sht->legacy_hosts); | |
528 | return shost; | |
529 | } | |
530 | EXPORT_SYMBOL(scsi_register); | |
531 | ||
532 | void scsi_unregister(struct Scsi_Host *shost) | |
533 | { | |
534 | list_del(&shost->sht_legacy_list); | |
535 | scsi_host_put(shost); | |
536 | } | |
537 | EXPORT_SYMBOL(scsi_unregister); | |
538 | ||
9f3b795a | 539 | static int __scsi_host_match(struct device *dev, const void *data) |
9c770108 DY |
540 | { |
541 | struct Scsi_Host *p; | |
9f3b795a | 542 | const unsigned short *hostnum = data; |
9c770108 | 543 | |
ee959b00 | 544 | p = class_to_shost(dev); |
9c770108 DY |
545 | return p->host_no == *hostnum; |
546 | } | |
547 | ||
1da177e4 LT |
548 | /** |
549 | * scsi_host_lookup - get a reference to a Scsi_Host by host no | |
1da177e4 LT |
550 | * @hostnum: host number to locate |
551 | * | |
552 | * Return value: | |
553 | * A pointer to located Scsi_Host or NULL. | |
3ed78972 MC |
554 | * |
555 | * The caller must do a scsi_host_put() to drop the reference | |
556 | * that scsi_host_get() took. The put_device() below dropped | |
557 | * the reference from class_find_device(). | |
1da177e4 LT |
558 | **/ |
559 | struct Scsi_Host *scsi_host_lookup(unsigned short hostnum) | |
560 | { | |
ee959b00 | 561 | struct device *cdev; |
315cb0ad | 562 | struct Scsi_Host *shost = NULL; |
1da177e4 | 563 | |
695794ae GKH |
564 | cdev = class_find_device(&shost_class, NULL, &hostnum, |
565 | __scsi_host_match); | |
3ed78972 | 566 | if (cdev) { |
9c770108 | 567 | shost = scsi_host_get(class_to_shost(cdev)); |
3ed78972 MC |
568 | put_device(cdev); |
569 | } | |
1da177e4 LT |
570 | return shost; |
571 | } | |
572 | EXPORT_SYMBOL(scsi_host_lookup); | |
573 | ||
574 | /** | |
575 | * scsi_host_get - inc a Scsi_Host ref count | |
576 | * @shost: Pointer to Scsi_Host to inc. | |
577 | **/ | |
578 | struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost) | |
579 | { | |
d3301874 | 580 | if ((shost->shost_state == SHOST_DEL) || |
1da177e4 LT |
581 | !get_device(&shost->shost_gendev)) |
582 | return NULL; | |
583 | return shost; | |
584 | } | |
585 | EXPORT_SYMBOL(scsi_host_get); | |
586 | ||
587 | /** | |
588 | * scsi_host_put - dec a Scsi_Host ref count | |
589 | * @shost: Pointer to Scsi_Host to dec. | |
590 | **/ | |
591 | void scsi_host_put(struct Scsi_Host *shost) | |
592 | { | |
593 | put_device(&shost->shost_gendev); | |
594 | } | |
595 | EXPORT_SYMBOL(scsi_host_put); | |
596 | ||
597 | int scsi_init_hosts(void) | |
598 | { | |
599 | return class_register(&shost_class); | |
600 | } | |
601 | ||
602 | void scsi_exit_hosts(void) | |
603 | { | |
604 | class_unregister(&shost_class); | |
126a4fe0 | 605 | ida_destroy(&host_index_ida); |
1da177e4 LT |
606 | } |
607 | ||
608 | int scsi_is_host_device(const struct device *dev) | |
609 | { | |
b0ed4336 | 610 | return dev->type == &scsi_host_type; |
1da177e4 LT |
611 | } |
612 | EXPORT_SYMBOL(scsi_is_host_device); | |
613 | ||
614 | /** | |
615 | * scsi_queue_work - Queue work to the Scsi_Host workqueue. | |
616 | * @shost: Pointer to Scsi_Host. | |
617 | * @work: Work to queue for execution. | |
618 | * | |
619 | * Return value: | |
dd7e2f22 MR |
620 | * 1 - work queued for execution |
621 | * 0 - work is already queued | |
622 | * -EINVAL - work queue doesn't exist | |
1da177e4 LT |
623 | **/ |
624 | int scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work) | |
625 | { | |
626 | if (unlikely(!shost->work_q)) { | |
91921e01 | 627 | shost_printk(KERN_ERR, shost, |
1da177e4 LT |
628 | "ERROR: Scsi host '%s' attempted to queue scsi-work, " |
629 | "when no workqueue created.\n", shost->hostt->name); | |
630 | dump_stack(); | |
631 | ||
632 | return -EINVAL; | |
633 | } | |
634 | ||
635 | return queue_work(shost->work_q, work); | |
636 | } | |
637 | EXPORT_SYMBOL_GPL(scsi_queue_work); | |
638 | ||
639 | /** | |
640 | * scsi_flush_work - Flush a Scsi_Host's workqueue. | |
641 | * @shost: Pointer to Scsi_Host. | |
642 | **/ | |
643 | void scsi_flush_work(struct Scsi_Host *shost) | |
644 | { | |
645 | if (!shost->work_q) { | |
91921e01 | 646 | shost_printk(KERN_ERR, shost, |
1da177e4 LT |
647 | "ERROR: Scsi host '%s' attempted to flush scsi-work, " |
648 | "when no workqueue created.\n", shost->hostt->name); | |
649 | dump_stack(); | |
650 | return; | |
651 | } | |
652 | ||
653 | flush_workqueue(shost->work_q); | |
654 | } | |
655 | EXPORT_SYMBOL_GPL(scsi_flush_work); |