Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-only
2 : /*
3 : * hosts.c Copyright (C) 1992 Drew Eckhardt
4 : * Copyright (C) 1993, 1994, 1995 Eric Youngdale
5 : * Copyright (C) 2002-2003 Christoph Hellwig
6 : *
7 : * mid to lowlevel SCSI driver interface
8 : * Initial versions: Drew Eckhardt
9 : * Subsequent revisions: Eric Youngdale
10 : *
11 : * <drew@colorado.edu>
12 : *
13 : * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli
14 : * Added QLOGIC QLA1280 SCSI controller kernel host support.
15 : * August 4, 1999 Fred Lewis, Intel DuPont
16 : *
17 : * Updated to reflect the new initialization scheme for the higher
18 : * level of scsi drivers (sd/sr/st)
19 : * September 17, 2000 Torben Mathiasen <tmm@image.dk>
20 : *
21 : * Restructured scsi_host lists and associated functions.
22 : * September 04, 2002 Mike Anderson (andmike@us.ibm.com)
23 : */
24 :
25 : #include <linux/module.h>
26 : #include <linux/blkdev.h>
27 : #include <linux/kernel.h>
28 : #include <linux/slab.h>
29 : #include <linux/kthread.h>
30 : #include <linux/string.h>
31 : #include <linux/mm.h>
32 : #include <linux/init.h>
33 : #include <linux/completion.h>
34 : #include <linux/transport_class.h>
35 : #include <linux/platform_device.h>
36 : #include <linux/pm_runtime.h>
37 : #include <linux/idr.h>
38 : #include <scsi/scsi_device.h>
39 : #include <scsi/scsi_host.h>
40 : #include <scsi/scsi_transport.h>
41 : #include <scsi/scsi_cmnd.h>
42 :
43 : #include "scsi_priv.h"
44 : #include "scsi_logging.h"
45 :
46 :
47 : static int shost_eh_deadline = -1;
48 :
49 : module_param_named(eh_deadline, shost_eh_deadline, int, S_IRUGO|S_IWUSR);
50 : MODULE_PARM_DESC(eh_deadline,
51 : "SCSI EH timeout in seconds (should be between 0 and 2^31-1)");
52 :
53 : static DEFINE_IDA(host_index_ida);
54 :
55 :
56 0 : static void scsi_host_cls_release(struct device *dev)
57 : {
58 0 : put_device(&class_to_shost(dev)->shost_gendev);
59 0 : }
60 :
61 : static struct class shost_class = {
62 : .name = "scsi_host",
63 : .dev_release = scsi_host_cls_release,
64 : };
65 :
66 : /**
67 : * scsi_host_set_state - Take the given host through the host state model.
68 : * @shost: scsi host to change the state of.
69 : * @state: state to change to.
70 : *
71 : * Returns zero if unsuccessful or an error if the requested
72 : * transition is illegal.
73 : **/
74 0 : int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state)
75 : {
76 0 : enum scsi_host_state oldstate = shost->shost_state;
77 :
78 0 : if (state == oldstate)
79 : return 0;
80 :
81 0 : switch (state) {
82 0 : case SHOST_CREATED:
83 : /* There are no legal states that come back to
84 : * created. This is the manually initialised start
85 : * state */
86 0 : goto illegal;
87 :
88 0 : case SHOST_RUNNING:
89 0 : switch (oldstate) {
90 : case SHOST_CREATED:
91 : case SHOST_RECOVERY:
92 : break;
93 0 : default:
94 0 : goto illegal;
95 : }
96 : break;
97 :
98 0 : case SHOST_RECOVERY:
99 0 : switch (oldstate) {
100 : case SHOST_RUNNING:
101 : break;
102 0 : default:
103 0 : goto illegal;
104 : }
105 : break;
106 :
107 0 : case SHOST_CANCEL:
108 0 : switch (oldstate) {
109 : case SHOST_CREATED:
110 : case SHOST_RUNNING:
111 : case SHOST_CANCEL_RECOVERY:
112 : break;
113 0 : default:
114 0 : goto illegal;
115 : }
116 : break;
117 :
118 0 : case SHOST_DEL:
119 0 : switch (oldstate) {
120 : case SHOST_CANCEL:
121 : case SHOST_DEL_RECOVERY:
122 : break;
123 0 : default:
124 0 : goto illegal;
125 : }
126 : break;
127 :
128 0 : case SHOST_CANCEL_RECOVERY:
129 0 : switch (oldstate) {
130 : case SHOST_CANCEL:
131 : case SHOST_RECOVERY:
132 : break;
133 0 : default:
134 0 : goto illegal;
135 : }
136 : break;
137 :
138 0 : case SHOST_DEL_RECOVERY:
139 0 : switch (oldstate) {
140 : case SHOST_CANCEL_RECOVERY:
141 : break;
142 0 : default:
143 0 : goto illegal;
144 : }
145 : break;
146 : }
147 0 : shost->shost_state = state;
148 0 : return 0;
149 :
150 0 : illegal:
151 : SCSI_LOG_ERROR_RECOVERY(1,
152 : shost_printk(KERN_ERR, shost,
153 : "Illegal host state transition"
154 : "%s->%s\n",
155 : scsi_host_state_name(oldstate),
156 : scsi_host_state_name(state)));
157 : return -EINVAL;
158 : }
159 :
160 : /**
161 : * scsi_remove_host - remove a scsi host
162 : * @shost: a pointer to a scsi host to remove
163 : **/
164 0 : void scsi_remove_host(struct Scsi_Host *shost)
165 : {
166 0 : unsigned long flags;
167 :
168 0 : mutex_lock(&shost->scan_mutex);
169 0 : spin_lock_irqsave(shost->host_lock, flags);
170 0 : if (scsi_host_set_state(shost, SHOST_CANCEL))
171 0 : if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) {
172 0 : spin_unlock_irqrestore(shost->host_lock, flags);
173 0 : mutex_unlock(&shost->scan_mutex);
174 0 : return;
175 : }
176 0 : spin_unlock_irqrestore(shost->host_lock, flags);
177 :
178 0 : scsi_autopm_get_host(shost);
179 0 : flush_workqueue(shost->tmf_work_q);
180 0 : scsi_forget_host(shost);
181 0 : mutex_unlock(&shost->scan_mutex);
182 0 : scsi_proc_host_rm(shost);
183 :
184 0 : spin_lock_irqsave(shost->host_lock, flags);
185 0 : if (scsi_host_set_state(shost, SHOST_DEL))
186 0 : BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY));
187 0 : spin_unlock_irqrestore(shost->host_lock, flags);
188 :
189 0 : transport_unregister_device(&shost->shost_gendev);
190 0 : device_unregister(&shost->shost_dev);
191 0 : device_del(&shost->shost_gendev);
192 : }
193 : EXPORT_SYMBOL(scsi_remove_host);
194 :
195 : /**
196 : * scsi_add_host_with_dma - add a scsi host with dma device
197 : * @shost: scsi host pointer to add
198 : * @dev: a struct device of type scsi class
199 : * @dma_dev: dma device for the host
200 : *
201 : * Note: You rarely need to worry about this unless you're in a
202 : * virtualised host environments, so use the simpler scsi_add_host()
203 : * function instead.
204 : *
205 : * Return value:
206 : * 0 on success / != 0 for error
207 : **/
208 0 : int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
209 : struct device *dma_dev)
210 : {
211 0 : struct scsi_host_template *sht = shost->hostt;
212 0 : int error = -EINVAL;
213 :
214 0 : shost_printk(KERN_INFO, shost, "%s\n",
215 : sht->info ? sht->info(shost) : sht->name);
216 :
217 0 : if (!shost->can_queue) {
218 0 : shost_printk(KERN_ERR, shost,
219 : "can_queue = 0 no longer supported\n");
220 0 : goto fail;
221 : }
222 :
223 0 : error = scsi_init_sense_cache(shost);
224 0 : if (error)
225 0 : goto fail;
226 :
227 0 : error = scsi_mq_setup_tags(shost);
228 0 : if (error)
229 0 : goto fail;
230 :
231 0 : if (!shost->shost_gendev.parent)
232 0 : shost->shost_gendev.parent = dev ? dev : &platform_bus;
233 0 : if (!dma_dev)
234 0 : dma_dev = shost->shost_gendev.parent;
235 :
236 0 : shost->dma_dev = dma_dev;
237 :
238 : /*
239 : * Increase usage count temporarily here so that calling
240 : * scsi_autopm_put_host() will trigger runtime idle if there is
241 : * nothing else preventing suspending the device.
242 : */
243 0 : pm_runtime_get_noresume(&shost->shost_gendev);
244 0 : pm_runtime_set_active(&shost->shost_gendev);
245 0 : pm_runtime_enable(&shost->shost_gendev);
246 0 : device_enable_async_suspend(&shost->shost_gendev);
247 :
248 0 : error = device_add(&shost->shost_gendev);
249 0 : if (error)
250 0 : goto out_disable_runtime_pm;
251 :
252 0 : scsi_host_set_state(shost, SHOST_RUNNING);
253 0 : get_device(shost->shost_gendev.parent);
254 :
255 0 : device_enable_async_suspend(&shost->shost_dev);
256 :
257 0 : error = device_add(&shost->shost_dev);
258 0 : if (error)
259 0 : goto out_del_gendev;
260 :
261 0 : get_device(&shost->shost_gendev);
262 :
263 0 : if (shost->transportt->host_size) {
264 0 : shost->shost_data = kzalloc(shost->transportt->host_size,
265 : GFP_KERNEL);
266 0 : if (shost->shost_data == NULL) {
267 0 : error = -ENOMEM;
268 0 : goto out_del_dev;
269 : }
270 : }
271 :
272 0 : if (shost->transportt->create_work_queue) {
273 0 : snprintf(shost->work_q_name, sizeof(shost->work_q_name),
274 : "scsi_wq_%d", shost->host_no);
275 0 : shost->work_q = alloc_workqueue("%s",
276 : WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
277 : 1, shost->work_q_name);
278 :
279 0 : if (!shost->work_q) {
280 0 : error = -EINVAL;
281 0 : goto out_free_shost_data;
282 : }
283 : }
284 :
285 0 : error = scsi_sysfs_add_host(shost);
286 0 : if (error)
287 0 : goto out_destroy_host;
288 :
289 : scsi_proc_host_add(shost);
290 0 : scsi_autopm_put_host(shost);
291 : return error;
292 :
293 0 : out_destroy_host:
294 0 : if (shost->work_q)
295 0 : destroy_workqueue(shost->work_q);
296 0 : out_free_shost_data:
297 0 : kfree(shost->shost_data);
298 0 : out_del_dev:
299 0 : device_del(&shost->shost_dev);
300 0 : out_del_gendev:
301 0 : device_del(&shost->shost_gendev);
302 0 : out_disable_runtime_pm:
303 0 : device_disable_async_suspend(&shost->shost_gendev);
304 0 : pm_runtime_disable(&shost->shost_gendev);
305 0 : pm_runtime_set_suspended(&shost->shost_gendev);
306 0 : pm_runtime_put_noidle(&shost->shost_gendev);
307 0 : scsi_mq_destroy_tags(shost);
308 : fail:
309 : return error;
310 : }
311 : EXPORT_SYMBOL(scsi_add_host_with_dma);
312 :
313 0 : static void scsi_host_dev_release(struct device *dev)
314 : {
315 0 : struct Scsi_Host *shost = dev_to_shost(dev);
316 0 : struct device *parent = dev->parent;
317 :
318 0 : scsi_proc_hostdir_rm(shost->hostt);
319 :
320 : /* Wait for functions invoked through call_rcu(&shost->rcu, ...) */
321 0 : rcu_barrier();
322 :
323 0 : if (shost->tmf_work_q)
324 0 : destroy_workqueue(shost->tmf_work_q);
325 0 : if (shost->ehandler)
326 0 : kthread_stop(shost->ehandler);
327 0 : if (shost->work_q)
328 0 : destroy_workqueue(shost->work_q);
329 :
330 0 : if (shost->shost_state == SHOST_CREATED) {
331 : /*
332 : * Free the shost_dev device name here if scsi_host_alloc()
333 : * and scsi_host_put() have been called but neither
334 : * scsi_host_add() nor scsi_host_remove() has been called.
335 : * This avoids that the memory allocated for the shost_dev
336 : * name is leaked.
337 : */
338 0 : kfree(dev_name(&shost->shost_dev));
339 : }
340 :
341 0 : if (shost->tag_set.tags)
342 0 : scsi_mq_destroy_tags(shost);
343 :
344 0 : kfree(shost->shost_data);
345 :
346 0 : ida_simple_remove(&host_index_ida, shost->host_no);
347 :
348 0 : if (parent)
349 0 : put_device(parent);
350 0 : kfree(shost);
351 0 : }
352 :
353 : static struct device_type scsi_host_type = {
354 : .name = "scsi_host",
355 : .release = scsi_host_dev_release,
356 : };
357 :
358 : /**
359 : * scsi_host_alloc - register a scsi host adapter instance.
360 : * @sht: pointer to scsi host template
361 : * @privsize: extra bytes to allocate for driver
362 : *
363 : * Note:
364 : * Allocate a new Scsi_Host and perform basic initialization.
365 : * The host is not published to the scsi midlayer until scsi_add_host
366 : * is called.
367 : *
368 : * Return value:
369 : * Pointer to a new Scsi_Host
370 : **/
371 0 : struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
372 : {
373 0 : struct Scsi_Host *shost;
374 0 : gfp_t gfp_mask = GFP_KERNEL;
375 0 : int index;
376 :
377 0 : if (sht->unchecked_isa_dma && privsize)
378 0 : gfp_mask |= __GFP_DMA;
379 :
380 0 : shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask);
381 0 : if (!shost)
382 : return NULL;
383 :
384 0 : shost->host_lock = &shost->default_lock;
385 0 : spin_lock_init(shost->host_lock);
386 0 : shost->shost_state = SHOST_CREATED;
387 0 : INIT_LIST_HEAD(&shost->__devices);
388 0 : INIT_LIST_HEAD(&shost->__targets);
389 0 : INIT_LIST_HEAD(&shost->eh_cmd_q);
390 0 : INIT_LIST_HEAD(&shost->starved_list);
391 0 : init_waitqueue_head(&shost->host_wait);
392 0 : mutex_init(&shost->scan_mutex);
393 :
394 0 : index = ida_simple_get(&host_index_ida, 0, 0, GFP_KERNEL);
395 0 : if (index < 0)
396 0 : goto fail_kfree;
397 0 : shost->host_no = index;
398 :
399 0 : shost->dma_channel = 0xff;
400 :
401 : /* These three are default values which can be overridden */
402 0 : shost->max_channel = 0;
403 0 : shost->max_id = 8;
404 0 : shost->max_lun = 8;
405 :
406 : /* Give each shost a default transportt */
407 0 : shost->transportt = &blank_transport_template;
408 :
409 : /*
410 : * All drivers right now should be able to handle 12 byte
411 : * commands. Every so often there are requests for 16 byte
412 : * commands, but individual low-level drivers need to certify that
413 : * they actually do something sensible with such commands.
414 : */
415 0 : shost->max_cmd_len = 12;
416 0 : shost->hostt = sht;
417 0 : shost->this_id = sht->this_id;
418 0 : shost->can_queue = sht->can_queue;
419 0 : shost->sg_tablesize = sht->sg_tablesize;
420 0 : shost->sg_prot_tablesize = sht->sg_prot_tablesize;
421 0 : shost->cmd_per_lun = sht->cmd_per_lun;
422 0 : shost->unchecked_isa_dma = sht->unchecked_isa_dma;
423 0 : shost->no_write_same = sht->no_write_same;
424 0 : shost->host_tagset = sht->host_tagset;
425 :
426 0 : if (shost_eh_deadline == -1 || !sht->eh_host_reset_handler)
427 0 : shost->eh_deadline = -1;
428 0 : else if ((ulong) shost_eh_deadline * HZ > INT_MAX) {
429 0 : shost_printk(KERN_WARNING, shost,
430 : "eh_deadline %u too large, setting to %u\n",
431 : shost_eh_deadline, INT_MAX / HZ);
432 0 : shost->eh_deadline = INT_MAX;
433 : } else
434 0 : shost->eh_deadline = shost_eh_deadline * HZ;
435 :
436 0 : if (sht->supported_mode == MODE_UNKNOWN)
437 : /* means we didn't set it ... default to INITIATOR */
438 0 : shost->active_mode = MODE_INITIATOR;
439 : else
440 0 : shost->active_mode = sht->supported_mode;
441 :
442 0 : if (sht->max_host_blocked)
443 0 : shost->max_host_blocked = sht->max_host_blocked;
444 : else
445 0 : shost->max_host_blocked = SCSI_DEFAULT_HOST_BLOCKED;
446 :
447 : /*
448 : * If the driver imposes no hard sector transfer limit, start at
449 : * machine infinity initially.
450 : */
451 0 : if (sht->max_sectors)
452 0 : shost->max_sectors = sht->max_sectors;
453 : else
454 0 : shost->max_sectors = SCSI_DEFAULT_MAX_SECTORS;
455 :
456 0 : if (sht->max_segment_size)
457 0 : shost->max_segment_size = sht->max_segment_size;
458 : else
459 0 : shost->max_segment_size = BLK_MAX_SEGMENT_SIZE;
460 :
461 : /*
462 : * assume a 4GB boundary, if not set
463 : */
464 0 : if (sht->dma_boundary)
465 0 : shost->dma_boundary = sht->dma_boundary;
466 : else
467 0 : shost->dma_boundary = 0xffffffff;
468 :
469 0 : if (sht->virt_boundary_mask)
470 0 : shost->virt_boundary_mask = sht->virt_boundary_mask;
471 :
472 0 : device_initialize(&shost->shost_gendev);
473 0 : dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
474 0 : shost->shost_gendev.bus = &scsi_bus_type;
475 0 : shost->shost_gendev.type = &scsi_host_type;
476 :
477 0 : device_initialize(&shost->shost_dev);
478 0 : shost->shost_dev.parent = &shost->shost_gendev;
479 0 : shost->shost_dev.class = &shost_class;
480 0 : dev_set_name(&shost->shost_dev, "host%d", shost->host_no);
481 0 : shost->shost_dev.groups = scsi_sysfs_shost_attr_groups;
482 :
483 0 : shost->ehandler = kthread_run(scsi_error_handler, shost,
484 : "scsi_eh_%d", shost->host_no);
485 0 : if (IS_ERR(shost->ehandler)) {
486 0 : shost_printk(KERN_WARNING, shost,
487 : "error handler thread failed to spawn, error = %ld\n",
488 : PTR_ERR(shost->ehandler));
489 0 : goto fail_index_remove;
490 : }
491 :
492 0 : shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d",
493 : WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS,
494 : 1, shost->host_no);
495 0 : if (!shost->tmf_work_q) {
496 0 : shost_printk(KERN_WARNING, shost,
497 : "failed to create tmf workq\n");
498 0 : goto fail_kthread;
499 : }
500 : scsi_proc_hostdir_add(shost->hostt);
501 : return shost;
502 :
503 0 : fail_kthread:
504 0 : kthread_stop(shost->ehandler);
505 0 : fail_index_remove:
506 0 : ida_simple_remove(&host_index_ida, shost->host_no);
507 0 : fail_kfree:
508 0 : kfree(shost);
509 0 : return NULL;
510 : }
511 : EXPORT_SYMBOL(scsi_host_alloc);
512 :
513 0 : static int __scsi_host_match(struct device *dev, const void *data)
514 : {
515 0 : struct Scsi_Host *p;
516 0 : const unsigned short *hostnum = data;
517 :
518 0 : p = class_to_shost(dev);
519 0 : return p->host_no == *hostnum;
520 : }
521 :
522 : /**
523 : * scsi_host_lookup - get a reference to a Scsi_Host by host no
524 : * @hostnum: host number to locate
525 : *
526 : * Return value:
527 : * A pointer to located Scsi_Host or NULL.
528 : *
529 : * The caller must do a scsi_host_put() to drop the reference
530 : * that scsi_host_get() took. The put_device() below dropped
531 : * the reference from class_find_device().
532 : **/
533 0 : struct Scsi_Host *scsi_host_lookup(unsigned short hostnum)
534 : {
535 0 : struct device *cdev;
536 0 : struct Scsi_Host *shost = NULL;
537 :
538 0 : cdev = class_find_device(&shost_class, NULL, &hostnum,
539 : __scsi_host_match);
540 0 : if (cdev) {
541 0 : shost = scsi_host_get(class_to_shost(cdev));
542 0 : put_device(cdev);
543 : }
544 0 : return shost;
545 : }
546 : EXPORT_SYMBOL(scsi_host_lookup);
547 :
548 : /**
549 : * scsi_host_get - inc a Scsi_Host ref count
550 : * @shost: Pointer to Scsi_Host to inc.
551 : **/
552 0 : struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost)
553 : {
554 0 : if ((shost->shost_state == SHOST_DEL) ||
555 0 : !get_device(&shost->shost_gendev))
556 0 : return NULL;
557 : return shost;
558 : }
559 : EXPORT_SYMBOL(scsi_host_get);
560 :
561 0 : static bool scsi_host_check_in_flight(struct request *rq, void *data,
562 : bool reserved)
563 : {
564 0 : int *count = data;
565 0 : struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
566 :
567 0 : if (test_bit(SCMD_STATE_INFLIGHT, &cmd->state))
568 0 : (*count)++;
569 :
570 0 : return true;
571 : }
572 :
573 : /**
574 : * scsi_host_busy - Return the host busy counter
575 : * @shost: Pointer to Scsi_Host to inc.
576 : **/
577 0 : int scsi_host_busy(struct Scsi_Host *shost)
578 : {
579 0 : int cnt = 0;
580 :
581 0 : blk_mq_tagset_busy_iter(&shost->tag_set,
582 : scsi_host_check_in_flight, &cnt);
583 0 : return cnt;
584 : }
585 : EXPORT_SYMBOL(scsi_host_busy);
586 :
587 : /**
588 : * scsi_host_put - dec a Scsi_Host ref count
589 : * @shost: Pointer to Scsi_Host to dec.
590 : **/
591 0 : void scsi_host_put(struct Scsi_Host *shost)
592 : {
593 0 : put_device(&shost->shost_gendev);
594 0 : }
595 : EXPORT_SYMBOL(scsi_host_put);
596 :
597 1 : int scsi_init_hosts(void)
598 : {
599 1 : return class_register(&shost_class);
600 : }
601 :
602 0 : void scsi_exit_hosts(void)
603 : {
604 0 : class_unregister(&shost_class);
605 0 : ida_destroy(&host_index_ida);
606 0 : }
607 :
608 0 : int scsi_is_host_device(const struct device *dev)
609 : {
610 0 : return dev->type == &scsi_host_type;
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:
620 : * 1 - work queued for execution
621 : * 0 - work is already queued
622 : * -EINVAL - work queue doesn't exist
623 : **/
624 0 : int scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work)
625 : {
626 0 : if (unlikely(!shost->work_q)) {
627 0 : shost_printk(KERN_ERR, shost,
628 : "ERROR: Scsi host '%s' attempted to queue scsi-work, "
629 : "when no workqueue created.\n", shost->hostt->name);
630 0 : dump_stack();
631 :
632 0 : return -EINVAL;
633 : }
634 :
635 0 : 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 0 : void scsi_flush_work(struct Scsi_Host *shost)
644 : {
645 0 : if (!shost->work_q) {
646 0 : shost_printk(KERN_ERR, shost,
647 : "ERROR: Scsi host '%s' attempted to flush scsi-work, "
648 : "when no workqueue created.\n", shost->hostt->name);
649 0 : dump_stack();
650 0 : return;
651 : }
652 :
653 0 : flush_workqueue(shost->work_q);
654 : }
655 : EXPORT_SYMBOL_GPL(scsi_flush_work);
656 :
657 0 : static bool complete_all_cmds_iter(struct request *rq, void *data, bool rsvd)
658 : {
659 0 : struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
660 0 : int status = *(int *)data;
661 :
662 0 : scsi_dma_unmap(scmd);
663 0 : scmd->result = status << 16;
664 0 : scmd->scsi_done(scmd);
665 0 : return true;
666 : }
667 :
668 : /**
669 : * scsi_host_complete_all_commands - Terminate all running commands
670 : * @shost: Scsi Host on which commands should be terminated
671 : * @status: Status to be set for the terminated commands
672 : *
673 : * There is no protection against modification of the number
674 : * of outstanding commands. It is the responsibility of the
675 : * caller to ensure that concurrent I/O submission and/or
676 : * completion is stopped when calling this function.
677 : */
678 0 : void scsi_host_complete_all_commands(struct Scsi_Host *shost, int status)
679 : {
680 0 : blk_mq_tagset_busy_iter(&shost->tag_set, complete_all_cmds_iter,
681 : &status);
682 0 : }
683 : EXPORT_SYMBOL_GPL(scsi_host_complete_all_commands);
684 :
685 : struct scsi_host_busy_iter_data {
686 : bool (*fn)(struct scsi_cmnd *, void *, bool);
687 : void *priv;
688 : };
689 :
690 0 : static bool __scsi_host_busy_iter_fn(struct request *req, void *priv,
691 : bool reserved)
692 : {
693 0 : struct scsi_host_busy_iter_data *iter_data = priv;
694 0 : struct scsi_cmnd *sc = blk_mq_rq_to_pdu(req);
695 :
696 0 : return iter_data->fn(sc, iter_data->priv, reserved);
697 : }
698 :
699 : /**
700 : * scsi_host_busy_iter - Iterate over all busy commands
701 : * @shost: Pointer to Scsi_Host.
702 : * @fn: Function to call on each busy command
703 : * @priv: Data pointer passed to @fn
704 : *
705 : * If locking against concurrent command completions is required
706 : * ithas to be provided by the caller
707 : **/
708 0 : void scsi_host_busy_iter(struct Scsi_Host *shost,
709 : bool (*fn)(struct scsi_cmnd *, void *, bool),
710 : void *priv)
711 : {
712 0 : struct scsi_host_busy_iter_data iter_data = {
713 : .fn = fn,
714 : .priv = priv,
715 : };
716 :
717 0 : blk_mq_tagset_busy_iter(&shost->tag_set, __scsi_host_busy_iter_fn,
718 : &iter_data);
719 0 : }
720 : EXPORT_SYMBOL_GPL(scsi_host_busy_iter);
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