1// SPDX-License-Identifier: GPL-2.0
2/*
3 * USB Attached SCSI
4 * Note that this is not the same as the USB Mass Storage driver
5 *
6 * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2016
7 * Copyright Matthew Wilcox for Intel Corp, 2010
8 * Copyright Sarah Sharp for Intel Corp, 2010
9 */
10
11#include <linux/blkdev.h>
12#include <linux/slab.h>
13#include <linux/types.h>
14#include <linux/module.h>
15#include <linux/usb.h>
16#include <linux/usb_usual.h>
17#include <linux/usb/hcd.h>
18#include <linux/usb/storage.h>
19#include <linux/usb/uas.h>
20
21#include <scsi/scsi.h>
22#include <scsi/scsi_eh.h>
23#include <scsi/scsi_dbg.h>
24#include <scsi/scsi_devinfo.h>
25#include <scsi/scsi_cmnd.h>
26#include <scsi/scsi_device.h>
27#include <scsi/scsi_host.h>
28#include <scsi/scsi_tcq.h>
29
30#include "uas-detect.h"
31#include "scsiglue.h"
32
33#define MAX_CMNDS 256
34
35struct uas_dev_info {
36 struct usb_interface *intf;
37 struct usb_device *udev;
38 struct usb_anchor cmd_urbs;
39 struct usb_anchor sense_urbs;
40 struct usb_anchor data_urbs;
41 u64 flags;
42 int qdepth, resetting;
43 unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
44 unsigned use_streams:1;
45 unsigned shutdown:1;
46 struct scsi_cmnd *cmnd[MAX_CMNDS];
47 spinlock_t lock;
48 struct work_struct work;
49 struct work_struct scan_work; /* for async scanning */
50};
51
52enum {
53 SUBMIT_STATUS_URB = BIT(1),
54 ALLOC_DATA_IN_URB = BIT(2),
55 SUBMIT_DATA_IN_URB = BIT(3),
56 ALLOC_DATA_OUT_URB = BIT(4),
57 SUBMIT_DATA_OUT_URB = BIT(5),
58 ALLOC_CMD_URB = BIT(6),
59 SUBMIT_CMD_URB = BIT(7),
60 COMMAND_INFLIGHT = BIT(8),
61 DATA_IN_URB_INFLIGHT = BIT(9),
62 DATA_OUT_URB_INFLIGHT = BIT(10),
63 COMMAND_ABORTED = BIT(11),
64 IS_IN_WORK_LIST = BIT(12),
65};
66
67/* Overrides scsi_pointer */
68struct uas_cmd_info {
69 unsigned int state;
70 unsigned int uas_tag;
71 struct urb *cmd_urb;
72 struct urb *data_in_urb;
73 struct urb *data_out_urb;
74};
75
76/* I hate forward declarations, but I actually have a loop */
77static int uas_submit_urbs(struct scsi_cmnd *cmnd,
78 struct uas_dev_info *devinfo);
79static void uas_do_work(struct work_struct *work);
80static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
81static void uas_free_streams(struct uas_dev_info *devinfo);
82static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
83 int status);
84
85/*
86 * This driver needs its own workqueue, as we need to control memory allocation.
87 *
88 * In the course of error handling and power management uas_wait_for_pending_cmnds()
89 * needs to flush pending work items. In these contexts we cannot allocate memory
90 * by doing block IO as we would deadlock. For the same reason we cannot wait
91 * for anything allocating memory not heeding these constraints.
92 *
93 * So we have to control all work items that can be on the workqueue we flush.
94 * Hence we cannot share a queue and need our own.
95 */
96static struct workqueue_struct *workqueue;
97
98static void uas_do_work(struct work_struct *work)
99{
100 struct uas_dev_info *devinfo =
101 container_of(work, struct uas_dev_info, work);
102 struct uas_cmd_info *cmdinfo;
103 struct scsi_cmnd *cmnd;
104 unsigned long flags;
105 int i, err;
106
107 spin_lock_irqsave(&devinfo->lock, flags);
108
109 if (devinfo->resetting)
110 goto out;
111
112 for (i = 0; i < devinfo->qdepth; i++) {
113 if (!devinfo->cmnd[i])
114 continue;
115
116 cmnd = devinfo->cmnd[i];
117 cmdinfo = scsi_cmd_priv(cmd: cmnd);
118
119 if (!(cmdinfo->state & IS_IN_WORK_LIST))
120 continue;
121
122 err = uas_submit_urbs(cmnd, devinfo: cmnd->device->hostdata);
123 if (!err)
124 cmdinfo->state &= ~IS_IN_WORK_LIST;
125 else
126 queue_work(wq: workqueue, work: &devinfo->work);
127 }
128out:
129 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
130}
131
132static void uas_scan_work(struct work_struct *work)
133{
134 struct uas_dev_info *devinfo =
135 container_of(work, struct uas_dev_info, scan_work);
136 struct Scsi_Host *shost = usb_get_intfdata(intf: devinfo->intf);
137
138 dev_dbg(&devinfo->intf->dev, "starting scan\n");
139 scsi_scan_host(shost);
140 dev_dbg(&devinfo->intf->dev, "scan complete\n");
141}
142
143static void uas_add_work(struct scsi_cmnd *cmnd)
144{
145 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
146 struct uas_dev_info *devinfo = cmnd->device->hostdata;
147
148 lockdep_assert_held(&devinfo->lock);
149 cmdinfo->state |= IS_IN_WORK_LIST;
150 queue_work(wq: workqueue, work: &devinfo->work);
151}
152
153static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
154{
155 struct uas_cmd_info *cmdinfo;
156 struct scsi_cmnd *cmnd;
157 unsigned long flags;
158 int i, err;
159
160 spin_lock_irqsave(&devinfo->lock, flags);
161 for (i = 0; i < devinfo->qdepth; i++) {
162 if (!devinfo->cmnd[i])
163 continue;
164
165 cmnd = devinfo->cmnd[i];
166 cmdinfo = scsi_cmd_priv(cmd: cmnd);
167 uas_log_cmd_state(cmnd, prefix: __func__, status: 0);
168 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
169 cmdinfo->state &= ~COMMAND_INFLIGHT;
170 cmnd->result = result << 16;
171 err = uas_try_complete(cmnd, caller: __func__);
172 WARN_ON(err != 0);
173 }
174 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
175}
176
177static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
178{
179 struct sense_iu *sense_iu = urb->transfer_buffer;
180 struct scsi_device *sdev = cmnd->device;
181
182 if (urb->actual_length > 16) {
183 unsigned len = be16_to_cpup(p: &sense_iu->len);
184 if (len + 16 != urb->actual_length) {
185 int newlen = min(len + 16, urb->actual_length) - 16;
186 if (newlen < 0)
187 newlen = 0;
188 sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
189 "disagrees with IU sense data length %d, "
190 "using %d bytes of sense data\n", __func__,
191 urb->actual_length, len, newlen);
192 len = newlen;
193 }
194 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
195 }
196
197 cmnd->result = sense_iu->status;
198}
199
200static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
201 int status)
202{
203 struct uas_cmd_info *ci = scsi_cmd_priv(cmd: cmnd);
204
205 if (status == -ENODEV) /* too late */
206 return;
207
208 scmd_printk(KERN_INFO, cmnd,
209 "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
210 prefix, status, ci->uas_tag,
211 (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
212 (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
213 (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "",
214 (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "",
215 (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "",
216 (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "",
217 (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "",
218 (ci->state & COMMAND_INFLIGHT) ? " CMD" : "",
219 (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
220 (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
221 (ci->state & COMMAND_ABORTED) ? " abort" : "",
222 (ci->state & IS_IN_WORK_LIST) ? " work" : "");
223 scsi_print_command(cmnd);
224}
225
226static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
227{
228 struct uas_cmd_info *cmdinfo;
229
230 if (!cmnd)
231 return;
232
233 cmdinfo = scsi_cmd_priv(cmd: cmnd);
234
235 if (cmdinfo->state & SUBMIT_CMD_URB)
236 usb_free_urb(urb: cmdinfo->cmd_urb);
237
238 /* data urbs may have never gotten their submit flag set */
239 if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
240 usb_free_urb(urb: cmdinfo->data_in_urb);
241 if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
242 usb_free_urb(urb: cmdinfo->data_out_urb);
243}
244
245static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
246{
247 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
248 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
249
250 lockdep_assert_held(&devinfo->lock);
251 if (cmdinfo->state & (COMMAND_INFLIGHT |
252 DATA_IN_URB_INFLIGHT |
253 DATA_OUT_URB_INFLIGHT |
254 COMMAND_ABORTED))
255 return -EBUSY;
256 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
257 uas_free_unsubmitted_urbs(cmnd);
258 scsi_done(cmd: cmnd);
259 return 0;
260}
261
262static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
263 unsigned direction)
264{
265 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
266 int err;
267
268 cmdinfo->state |= direction | SUBMIT_STATUS_URB;
269 err = uas_submit_urbs(cmnd, devinfo: cmnd->device->hostdata);
270 if (err) {
271 uas_add_work(cmnd);
272 }
273}
274
275static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
276{
277 u8 response_code = riu->response_code;
278
279 switch (response_code) {
280 case RC_INCORRECT_LUN:
281 set_host_byte(cmd: cmnd, status: DID_BAD_TARGET);
282 break;
283 case RC_TMF_SUCCEEDED:
284 set_host_byte(cmd: cmnd, status: DID_OK);
285 break;
286 case RC_TMF_NOT_SUPPORTED:
287 set_host_byte(cmd: cmnd, status: DID_BAD_TARGET);
288 break;
289 default:
290 uas_log_cmd_state(cmnd, prefix: "response iu", status: response_code);
291 set_host_byte(cmd: cmnd, status: DID_ERROR);
292 break;
293 }
294
295 return response_code == RC_TMF_SUCCEEDED;
296}
297
298static void uas_stat_cmplt(struct urb *urb)
299{
300 struct iu *iu = urb->transfer_buffer;
301 struct Scsi_Host *shost = urb->context;
302 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
303 struct urb *data_in_urb = NULL;
304 struct urb *data_out_urb = NULL;
305 struct scsi_cmnd *cmnd;
306 struct uas_cmd_info *cmdinfo;
307 unsigned long flags;
308 unsigned int idx;
309 int status = urb->status;
310 bool success;
311
312 if (status) {
313 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
314 dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
315 goto bail;
316 }
317
318 idx = be16_to_cpup(p: &iu->tag) - 1;
319
320 spin_lock_irqsave(&devinfo->lock, flags);
321
322 if (devinfo->resetting)
323 goto out;
324 if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
325 dev_err(&urb->dev->dev,
326 "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
327 goto out;
328 }
329
330 cmnd = devinfo->cmnd[idx];
331 cmdinfo = scsi_cmd_priv(cmd: cmnd);
332
333 if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
334 uas_log_cmd_state(cmnd, prefix: "unexpected status cmplt", status: 0);
335 goto out;
336 }
337
338 switch (iu->iu_id) {
339 case IU_ID_STATUS:
340 uas_sense(urb, cmnd);
341 if (cmnd->result != 0) {
342 /* cancel data transfers on error */
343 data_in_urb = usb_get_urb(urb: cmdinfo->data_in_urb);
344 data_out_urb = usb_get_urb(urb: cmdinfo->data_out_urb);
345 }
346 cmdinfo->state &= ~COMMAND_INFLIGHT;
347 uas_try_complete(cmnd, caller: __func__);
348 break;
349 case IU_ID_READ_READY:
350 if (!cmdinfo->data_in_urb ||
351 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
352 uas_log_cmd_state(cmnd, prefix: "unexpected read rdy", status: 0);
353 break;
354 }
355 uas_xfer_data(urb, cmnd, direction: SUBMIT_DATA_IN_URB);
356 break;
357 case IU_ID_WRITE_READY:
358 if (!cmdinfo->data_out_urb ||
359 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
360 uas_log_cmd_state(cmnd, prefix: "unexpected write rdy", status: 0);
361 break;
362 }
363 uas_xfer_data(urb, cmnd, direction: SUBMIT_DATA_OUT_URB);
364 break;
365 case IU_ID_RESPONSE:
366 cmdinfo->state &= ~COMMAND_INFLIGHT;
367 success = uas_evaluate_response_iu(riu: (struct response_iu *)iu, cmnd);
368 if (!success) {
369 /* Error, cancel data transfers */
370 data_in_urb = usb_get_urb(urb: cmdinfo->data_in_urb);
371 data_out_urb = usb_get_urb(urb: cmdinfo->data_out_urb);
372 }
373 uas_try_complete(cmnd, caller: __func__);
374 break;
375 default:
376 uas_log_cmd_state(cmnd, prefix: "bogus IU", status: iu->iu_id);
377 }
378 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
379 usb_free_urb(urb);
380
381 /* Unlinking of data urbs must be done without holding the lock */
382 if (data_in_urb) {
383 usb_unlink_urb(urb: data_in_urb);
384 usb_put_urb(urb: data_in_urb);
385 }
386 if (data_out_urb) {
387 usb_unlink_urb(urb: data_out_urb);
388 usb_put_urb(urb: data_out_urb);
389 }
390 return;
391
392out:
393 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
394bail:
395 usb_free_urb(urb);
396}
397
398static void uas_data_cmplt(struct urb *urb)
399{
400 struct scsi_cmnd *cmnd = urb->context;
401 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
402 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
403 struct scsi_data_buffer *sdb = &cmnd->sdb;
404 unsigned long flags;
405 int status = urb->status;
406
407 spin_lock_irqsave(&devinfo->lock, flags);
408
409 if (cmdinfo->data_in_urb == urb) {
410 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
411 cmdinfo->data_in_urb = NULL;
412 } else if (cmdinfo->data_out_urb == urb) {
413 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
414 cmdinfo->data_out_urb = NULL;
415 }
416
417 if (devinfo->resetting)
418 goto out;
419
420 /* Data urbs should not complete before the cmd urb is submitted */
421 if (cmdinfo->state & SUBMIT_CMD_URB) {
422 uas_log_cmd_state(cmnd, prefix: "unexpected data cmplt", status: 0);
423 goto out;
424 }
425
426 if (status) {
427 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
428 uas_log_cmd_state(cmnd, prefix: "data cmplt err", status);
429 /* error: no data transfered */
430 scsi_set_resid(cmd: cmnd, resid: sdb->length);
431 set_host_byte(cmd: cmnd, status: DID_ERROR);
432 } else {
433 scsi_set_resid(cmd: cmnd, resid: sdb->length - urb->actual_length);
434 }
435 uas_try_complete(cmnd, caller: __func__);
436out:
437 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
438 usb_free_urb(urb);
439}
440
441static void uas_cmd_cmplt(struct urb *urb)
442{
443 if (urb->status)
444 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
445
446 usb_free_urb(urb);
447}
448
449static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
450 struct scsi_cmnd *cmnd,
451 enum dma_data_direction dir)
452{
453 struct usb_device *udev = devinfo->udev;
454 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
455 struct urb *urb = usb_alloc_urb(iso_packets: 0, mem_flags: gfp);
456 struct scsi_data_buffer *sdb = &cmnd->sdb;
457 unsigned int pipe = (dir == DMA_FROM_DEVICE)
458 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
459
460 if (!urb)
461 goto out;
462 usb_fill_bulk_urb(urb, dev: udev, pipe, NULL, buffer_length: sdb->length,
463 complete_fn: uas_data_cmplt, context: cmnd);
464 if (devinfo->use_streams)
465 urb->stream_id = cmdinfo->uas_tag;
466 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
467 urb->sg = sdb->table.sgl;
468 out:
469 return urb;
470}
471
472static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
473 struct scsi_cmnd *cmnd)
474{
475 struct usb_device *udev = devinfo->udev;
476 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
477 struct urb *urb = usb_alloc_urb(iso_packets: 0, mem_flags: gfp);
478 struct sense_iu *iu;
479
480 if (!urb)
481 goto out;
482
483 iu = kzalloc(sizeof(*iu), gfp);
484 if (!iu)
485 goto free;
486
487 usb_fill_bulk_urb(urb, dev: udev, pipe: devinfo->status_pipe, transfer_buffer: iu, buffer_length: sizeof(*iu),
488 complete_fn: uas_stat_cmplt, context: cmnd->device->host);
489 if (devinfo->use_streams)
490 urb->stream_id = cmdinfo->uas_tag;
491 urb->transfer_flags |= URB_FREE_BUFFER;
492 out:
493 return urb;
494 free:
495 usb_free_urb(urb);
496 return NULL;
497}
498
499static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
500 struct scsi_cmnd *cmnd)
501{
502 struct usb_device *udev = devinfo->udev;
503 struct scsi_device *sdev = cmnd->device;
504 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
505 struct urb *urb = usb_alloc_urb(iso_packets: 0, mem_flags: gfp);
506 struct command_iu *iu;
507 int len;
508
509 if (!urb)
510 goto out;
511
512 len = cmnd->cmd_len - 16;
513 if (len < 0)
514 len = 0;
515 len = ALIGN(len, 4);
516 iu = kzalloc(sizeof(*iu) + len, gfp);
517 if (!iu)
518 goto free;
519
520 iu->iu_id = IU_ID_COMMAND;
521 iu->tag = cpu_to_be16(cmdinfo->uas_tag);
522 iu->prio_attr = UAS_SIMPLE_TAG;
523 iu->len = len;
524 int_to_scsilun(sdev->lun, &iu->lun);
525 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
526
527 usb_fill_bulk_urb(urb, dev: udev, pipe: devinfo->cmd_pipe, transfer_buffer: iu, buffer_length: sizeof(*iu) + len,
528 complete_fn: uas_cmd_cmplt, NULL);
529 urb->transfer_flags |= URB_FREE_BUFFER;
530 out:
531 return urb;
532 free:
533 usb_free_urb(urb);
534 return NULL;
535}
536
537/*
538 * Why should I request the Status IU before sending the Command IU? Spec
539 * says to, but also says the device may receive them in any order. Seems
540 * daft to me.
541 */
542
543static int uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
544{
545 struct uas_dev_info *devinfo = cmnd->device->hostdata;
546 struct urb *urb;
547 int err;
548
549 urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
550 if (!urb)
551 return -ENOMEM;
552 usb_anchor_urb(urb, anchor: &devinfo->sense_urbs);
553 err = usb_submit_urb(urb, mem_flags: gfp);
554 if (err) {
555 usb_unanchor_urb(urb);
556 uas_log_cmd_state(cmnd, prefix: "sense submit err", status: err);
557 usb_free_urb(urb);
558 }
559 return err;
560}
561
562static int uas_submit_urbs(struct scsi_cmnd *cmnd,
563 struct uas_dev_info *devinfo)
564{
565 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
566 int err;
567
568 lockdep_assert_held(&devinfo->lock);
569 if (cmdinfo->state & SUBMIT_STATUS_URB) {
570 err = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
571 if (err)
572 return err;
573 cmdinfo->state &= ~SUBMIT_STATUS_URB;
574 }
575
576 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
577 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
578 cmnd, dir: DMA_FROM_DEVICE);
579 if (!cmdinfo->data_in_urb)
580 return -ENOMEM;
581 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
582 }
583
584 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
585 usb_anchor_urb(urb: cmdinfo->data_in_urb, anchor: &devinfo->data_urbs);
586 err = usb_submit_urb(urb: cmdinfo->data_in_urb, GFP_ATOMIC);
587 if (err) {
588 usb_unanchor_urb(urb: cmdinfo->data_in_urb);
589 uas_log_cmd_state(cmnd, prefix: "data in submit err", status: err);
590 return err;
591 }
592 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
593 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
594 }
595
596 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
597 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
598 cmnd, dir: DMA_TO_DEVICE);
599 if (!cmdinfo->data_out_urb)
600 return -ENOMEM;
601 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
602 }
603
604 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
605 usb_anchor_urb(urb: cmdinfo->data_out_urb, anchor: &devinfo->data_urbs);
606 err = usb_submit_urb(urb: cmdinfo->data_out_urb, GFP_ATOMIC);
607 if (err) {
608 usb_unanchor_urb(urb: cmdinfo->data_out_urb);
609 uas_log_cmd_state(cmnd, prefix: "data out submit err", status: err);
610 return err;
611 }
612 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
613 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
614 }
615
616 if (cmdinfo->state & ALLOC_CMD_URB) {
617 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
618 if (!cmdinfo->cmd_urb)
619 return -ENOMEM;
620 cmdinfo->state &= ~ALLOC_CMD_URB;
621 }
622
623 if (cmdinfo->state & SUBMIT_CMD_URB) {
624 usb_anchor_urb(urb: cmdinfo->cmd_urb, anchor: &devinfo->cmd_urbs);
625 err = usb_submit_urb(urb: cmdinfo->cmd_urb, GFP_ATOMIC);
626 if (err) {
627 usb_unanchor_urb(urb: cmdinfo->cmd_urb);
628 uas_log_cmd_state(cmnd, prefix: "cmd submit err", status: err);
629 return err;
630 }
631 cmdinfo->cmd_urb = NULL;
632 cmdinfo->state &= ~SUBMIT_CMD_URB;
633 cmdinfo->state |= COMMAND_INFLIGHT;
634 }
635
636 return 0;
637}
638
639static int uas_queuecommand_lck(struct scsi_cmnd *cmnd)
640{
641 struct scsi_device *sdev = cmnd->device;
642 struct uas_dev_info *devinfo = sdev->hostdata;
643 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
644 unsigned long flags;
645 int idx, err;
646
647 /* Re-check scsi_block_requests now that we've the host-lock */
648 if (cmnd->device->host->host_self_blocked)
649 return SCSI_MLQUEUE_DEVICE_BUSY;
650
651 if ((devinfo->flags & US_FL_NO_ATA_1X) &&
652 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
653 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
654 sizeof(usb_stor_sense_invalidCDB));
655 cmnd->result = SAM_STAT_CHECK_CONDITION;
656 scsi_done(cmd: cmnd);
657 return 0;
658 }
659
660 spin_lock_irqsave(&devinfo->lock, flags);
661
662 if (devinfo->resetting) {
663 set_host_byte(cmd: cmnd, status: DID_ERROR);
664 scsi_done(cmd: cmnd);
665 goto zombie;
666 }
667
668 /* Find a free uas-tag */
669 for (idx = 0; idx < devinfo->qdepth; idx++) {
670 if (!devinfo->cmnd[idx])
671 break;
672 }
673 if (idx == devinfo->qdepth) {
674 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
675 return SCSI_MLQUEUE_DEVICE_BUSY;
676 }
677
678 memset(cmdinfo, 0, sizeof(*cmdinfo));
679 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
680 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
681
682 switch (cmnd->sc_data_direction) {
683 case DMA_FROM_DEVICE:
684 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
685 break;
686 case DMA_BIDIRECTIONAL:
687 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
688 fallthrough;
689 case DMA_TO_DEVICE:
690 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
691 break;
692 case DMA_NONE:
693 break;
694 }
695
696 if (!devinfo->use_streams)
697 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
698
699 err = uas_submit_urbs(cmnd, devinfo);
700 /*
701 * in case of fatal errors the SCSI layer is peculiar
702 * a command that has finished is a success for the purpose
703 * of queueing, no matter how fatal the error
704 */
705 if (err == -ENODEV) {
706 if (cmdinfo->state & (COMMAND_INFLIGHT | DATA_IN_URB_INFLIGHT |
707 DATA_OUT_URB_INFLIGHT))
708 goto out;
709
710 set_host_byte(cmd: cmnd, status: DID_NO_CONNECT);
711 scsi_done(cmd: cmnd);
712 goto zombie;
713 }
714 if (err) {
715 /* If we did nothing, give up now */
716 if (cmdinfo->state & SUBMIT_STATUS_URB) {
717 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
718 return SCSI_MLQUEUE_DEVICE_BUSY;
719 }
720 uas_add_work(cmnd);
721 }
722
723out:
724 devinfo->cmnd[idx] = cmnd;
725zombie:
726 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
727 return 0;
728}
729
730static DEF_SCSI_QCMD(uas_queuecommand)
731
732/*
733 * For now we do not support actually sending an abort to the device, so
734 * this eh always fails. Still we must define it to make sure that we've
735 * dropped all references to the cmnd in question once this function exits.
736 */
737static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
738{
739 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmd: cmnd);
740 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
741 struct urb *data_in_urb = NULL;
742 struct urb *data_out_urb = NULL;
743 unsigned long flags;
744
745 spin_lock_irqsave(&devinfo->lock, flags);
746
747 uas_log_cmd_state(cmnd, prefix: __func__, status: 0);
748
749 /* Ensure that try_complete does not call scsi_done */
750 cmdinfo->state |= COMMAND_ABORTED;
751
752 /* Drop all refs to this cmnd, kill data urbs to break their ref */
753 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
754 if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
755 data_in_urb = usb_get_urb(urb: cmdinfo->data_in_urb);
756 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
757 data_out_urb = usb_get_urb(urb: cmdinfo->data_out_urb);
758
759 uas_free_unsubmitted_urbs(cmnd);
760
761 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
762
763 if (data_in_urb) {
764 usb_kill_urb(urb: data_in_urb);
765 usb_put_urb(urb: data_in_urb);
766 }
767 if (data_out_urb) {
768 usb_kill_urb(urb: data_out_urb);
769 usb_put_urb(urb: data_out_urb);
770 }
771
772 return FAILED;
773}
774
775static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
776{
777 struct scsi_device *sdev = cmnd->device;
778 struct uas_dev_info *devinfo = sdev->hostdata;
779 struct usb_device *udev = devinfo->udev;
780 unsigned long flags;
781 int err;
782
783 err = usb_lock_device_for_reset(udev, iface: devinfo->intf);
784 if (err) {
785 shost_printk(KERN_ERR, sdev->host,
786 "%s FAILED to get lock err %d\n", __func__, err);
787 return FAILED;
788 }
789
790 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
791
792 spin_lock_irqsave(&devinfo->lock, flags);
793 devinfo->resetting = 1;
794 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
795
796 usb_kill_anchored_urbs(anchor: &devinfo->cmd_urbs);
797 usb_kill_anchored_urbs(anchor: &devinfo->sense_urbs);
798 usb_kill_anchored_urbs(anchor: &devinfo->data_urbs);
799 uas_zap_pending(devinfo, result: DID_RESET);
800
801 err = usb_reset_device(dev: udev);
802
803 spin_lock_irqsave(&devinfo->lock, flags);
804 devinfo->resetting = 0;
805 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
806
807 usb_unlock_device(udev);
808
809 if (err) {
810 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
811 __func__, err);
812 return FAILED;
813 }
814
815 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
816 return SUCCESS;
817}
818
819static int uas_target_alloc(struct scsi_target *starget)
820{
821 struct uas_dev_info *devinfo = (struct uas_dev_info *)
822 dev_to_shost(dev: starget->dev.parent)->hostdata;
823
824 if (devinfo->flags & US_FL_NO_REPORT_LUNS)
825 starget->no_report_luns = 1;
826
827 return 0;
828}
829
830static int uas_sdev_init(struct scsi_device *sdev)
831{
832 struct uas_dev_info *devinfo =
833 (struct uas_dev_info *)sdev->host->hostdata;
834
835 /*
836 * Some USB storage devices reset if the IO advice hints grouping mode
837 * page is queried. Hence skip that mode page.
838 */
839 sdev->sdev_bflags |= BLIST_SKIP_IO_HINTS;
840
841 sdev->hostdata = devinfo;
842 return 0;
843}
844
845static int uas_sdev_configure(struct scsi_device *sdev,
846 struct queue_limits *lim)
847{
848 struct uas_dev_info *devinfo = sdev->hostdata;
849
850 if (devinfo->flags & US_FL_MAX_SECTORS_64)
851 lim->max_hw_sectors = 64;
852 else if (devinfo->flags & US_FL_MAX_SECTORS_240)
853 lim->max_hw_sectors = 240;
854
855 if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
856 sdev->no_report_opcodes = 1;
857
858 /* A few buggy USB-ATA bridges don't understand FUA */
859 if (devinfo->flags & US_FL_BROKEN_FUA)
860 sdev->broken_fua = 1;
861
862 /* UAS also needs to support FL_ALWAYS_SYNC */
863 if (devinfo->flags & US_FL_ALWAYS_SYNC) {
864 sdev->skip_ms_page_3f = 1;
865 sdev->skip_ms_page_8 = 1;
866 sdev->wce_default_on = 1;
867 }
868
869 /* Some disks cannot handle READ_CAPACITY_16 */
870 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16)
871 sdev->no_read_capacity_16 = 1;
872
873 /* Some disks cannot handle WRITE_SAME */
874 if (devinfo->flags & US_FL_NO_SAME)
875 sdev->no_write_same = 1;
876 /*
877 * Some disks return the total number of blocks in response
878 * to READ CAPACITY rather than the highest block number.
879 * If this device makes that mistake, tell the sd driver.
880 */
881 if (devinfo->flags & US_FL_FIX_CAPACITY)
882 sdev->fix_capacity = 1;
883
884 /*
885 * in some cases we have to guess
886 */
887 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
888 sdev->guess_capacity = 1;
889
890 /*
891 * Some devices report generic values until the media has been
892 * accessed. Force a READ(10) prior to querying device
893 * characteristics.
894 */
895 sdev->read_before_ms = 1;
896
897 /*
898 * Some devices don't like MODE SENSE with page=0x3f,
899 * which is the command used for checking if a device
900 * is write-protected. Now that we tell the sd driver
901 * to do a 192-byte transfer with this command the
902 * majority of devices work fine, but a few still can't
903 * handle it. The sd driver will simply assume those
904 * devices are write-enabled.
905 */
906 if (devinfo->flags & US_FL_NO_WP_DETECT)
907 sdev->skip_ms_page_3f = 1;
908
909 scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
910 return 0;
911}
912
913static const struct scsi_host_template uas_host_template = {
914 .module = THIS_MODULE,
915 .name = "uas",
916 .queuecommand = uas_queuecommand,
917 .target_alloc = uas_target_alloc,
918 .sdev_init = uas_sdev_init,
919 .sdev_configure = uas_sdev_configure,
920 .eh_abort_handler = uas_eh_abort_handler,
921 .eh_device_reset_handler = uas_eh_device_reset_handler,
922 .this_id = -1,
923 .skip_settle_delay = 1,
924 /*
925 * The protocol has no requirements on alignment in the strict sense.
926 * Controllers may or may not have alignment restrictions.
927 * As this is not exported, we use an extremely conservative guess.
928 */
929 .dma_alignment = 511,
930 .dma_boundary = PAGE_SIZE - 1,
931 .cmd_size = sizeof(struct uas_cmd_info),
932};
933
934#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
935 vendorName, productName, useProtocol, useTransport, \
936 initFunction, flags) \
937{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
938 .driver_info = (flags) }
939
940static const struct usb_device_id uas_usb_ids[] = {
941# include "unusual_uas.h"
942 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
943 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
944 { }
945};
946MODULE_DEVICE_TABLE(usb, uas_usb_ids);
947
948#undef UNUSUAL_DEV
949
950static int uas_switch_interface(struct usb_device *udev,
951 struct usb_interface *intf)
952{
953 struct usb_host_interface *alt;
954
955 alt = uas_find_uas_alt_setting(intf);
956 if (!alt)
957 return -ENODEV;
958
959 return usb_set_interface(dev: udev, ifnum: alt->desc.bInterfaceNumber,
960 alternate: alt->desc.bAlternateSetting);
961}
962
963static int uas_configure_endpoints(struct uas_dev_info *devinfo)
964{
965 struct usb_host_endpoint *eps[4] = { };
966 struct usb_device *udev = devinfo->udev;
967 int r;
968
969 r = uas_find_endpoints(alt: devinfo->intf->cur_altsetting, eps);
970 if (r)
971 return r;
972
973 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
974 usb_endpoint_num(&eps[0]->desc));
975 devinfo->status_pipe = usb_rcvbulkpipe(udev,
976 usb_endpoint_num(&eps[1]->desc));
977 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
978 usb_endpoint_num(&eps[2]->desc));
979 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
980 usb_endpoint_num(&eps[3]->desc));
981
982 if (udev->speed < USB_SPEED_SUPER) {
983 devinfo->qdepth = 32;
984 devinfo->use_streams = 0;
985 } else {
986 devinfo->qdepth = usb_alloc_streams(interface: devinfo->intf, eps: eps + 1,
987 num_eps: 3, MAX_CMNDS, GFP_NOIO);
988 if (devinfo->qdepth < 0)
989 return devinfo->qdepth;
990 devinfo->use_streams = 1;
991 }
992
993 return 0;
994}
995
996static void uas_free_streams(struct uas_dev_info *devinfo)
997{
998 struct usb_device *udev = devinfo->udev;
999 struct usb_host_endpoint *eps[3];
1000
1001 eps[0] = usb_pipe_endpoint(dev: udev, pipe: devinfo->status_pipe);
1002 eps[1] = usb_pipe_endpoint(dev: udev, pipe: devinfo->data_in_pipe);
1003 eps[2] = usb_pipe_endpoint(dev: udev, pipe: devinfo->data_out_pipe);
1004 usb_free_streams(interface: devinfo->intf, eps, num_eps: 3, GFP_NOIO);
1005}
1006
1007static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
1008{
1009 int result = -ENOMEM;
1010 struct Scsi_Host *shost = NULL;
1011 struct uas_dev_info *devinfo;
1012 struct usb_device *udev = interface_to_usbdev(intf);
1013 u64 dev_flags;
1014
1015 if (!uas_use_uas_driver(intf, id, flags_ret: &dev_flags))
1016 return -ENODEV;
1017
1018 if (uas_switch_interface(udev, intf))
1019 return -ENODEV;
1020
1021 shost = scsi_host_alloc(&uas_host_template,
1022 sizeof(struct uas_dev_info));
1023 if (!shost)
1024 goto set_alt0;
1025
1026 shost->max_cmd_len = 16 + 252;
1027 shost->max_id = 1;
1028 shost->max_lun = 256;
1029 shost->max_channel = 0;
1030 shost->sg_tablesize = udev->bus->sg_tablesize;
1031
1032 devinfo = (struct uas_dev_info *)shost->hostdata;
1033 devinfo->intf = intf;
1034 devinfo->udev = udev;
1035 devinfo->resetting = 0;
1036 devinfo->shutdown = 0;
1037 devinfo->flags = dev_flags;
1038 init_usb_anchor(anchor: &devinfo->cmd_urbs);
1039 init_usb_anchor(anchor: &devinfo->sense_urbs);
1040 init_usb_anchor(anchor: &devinfo->data_urbs);
1041 spin_lock_init(&devinfo->lock);
1042 INIT_WORK(&devinfo->work, uas_do_work);
1043 INIT_WORK(&devinfo->scan_work, uas_scan_work);
1044
1045 result = uas_configure_endpoints(devinfo);
1046 if (result)
1047 goto set_alt0;
1048
1049 /*
1050 * 1 tag is reserved for untagged commands +
1051 * 1 tag to avoid off by one errors in some bridge firmwares
1052 */
1053 shost->can_queue = devinfo->qdepth - 2;
1054
1055 usb_set_intfdata(intf, data: shost);
1056 result = scsi_add_host(host: shost, dev: &intf->dev);
1057 if (result)
1058 goto free_streams;
1059
1060 /* Submit the delayed_work for SCSI-device scanning */
1061 schedule_work(work: &devinfo->scan_work);
1062
1063 return result;
1064
1065free_streams:
1066 uas_free_streams(devinfo);
1067 usb_set_intfdata(intf, NULL);
1068set_alt0:
1069 usb_set_interface(dev: udev, ifnum: intf->altsetting[0].desc.bInterfaceNumber, alternate: 0);
1070 if (shost)
1071 scsi_host_put(t: shost);
1072 return result;
1073}
1074
1075static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1076{
1077 unsigned long flags;
1078 int i, r = 1;
1079
1080 spin_lock_irqsave(&devinfo->lock, flags);
1081
1082 for (i = 0; i < devinfo->qdepth; i++) {
1083 if (devinfo->cmnd[i]) {
1084 r = 0; /* Not empty */
1085 break;
1086 }
1087 }
1088
1089 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
1090
1091 return r;
1092}
1093
1094/*
1095 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1096 * get empty while there still is more work to do due to sense-urbs completing
1097 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1098 */
1099static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1100{
1101 unsigned long start_time;
1102 int r;
1103
1104 start_time = jiffies;
1105 do {
1106 flush_work(work: &devinfo->work);
1107
1108 r = usb_wait_anchor_empty_timeout(anchor: &devinfo->sense_urbs, timeout: 5000);
1109 if (r == 0)
1110 return -ETIME;
1111
1112 r = usb_wait_anchor_empty_timeout(anchor: &devinfo->data_urbs, timeout: 500);
1113 if (r == 0)
1114 return -ETIME;
1115
1116 if (time_after(jiffies, start_time + 5 * HZ))
1117 return -ETIME;
1118 } while (!uas_cmnd_list_empty(devinfo));
1119
1120 return 0;
1121}
1122
1123static int uas_pre_reset(struct usb_interface *intf)
1124{
1125 struct Scsi_Host *shost = usb_get_intfdata(intf);
1126 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1127 unsigned long flags;
1128
1129 if (devinfo->shutdown)
1130 return 0;
1131
1132 /* Block new requests */
1133 spin_lock_irqsave(shost->host_lock, flags);
1134 scsi_block_requests(shost);
1135 spin_unlock_irqrestore(lock: shost->host_lock, flags);
1136
1137 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1138 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1139 scsi_unblock_requests(shost);
1140 return 1;
1141 }
1142
1143 uas_free_streams(devinfo);
1144
1145 return 0;
1146}
1147
1148static int uas_post_reset(struct usb_interface *intf)
1149{
1150 struct Scsi_Host *shost = usb_get_intfdata(intf);
1151 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1152 unsigned long flags;
1153 int err;
1154
1155 if (devinfo->shutdown)
1156 return 0;
1157
1158 err = uas_configure_endpoints(devinfo);
1159 if (err && err != -ENODEV)
1160 shost_printk(KERN_ERR, shost,
1161 "%s: alloc streams error %d after reset",
1162 __func__, err);
1163
1164 /* we must unblock the host in every case lest we deadlock */
1165 spin_lock_irqsave(shost->host_lock, flags);
1166 scsi_report_bus_reset(shost, 0);
1167 spin_unlock_irqrestore(lock: shost->host_lock, flags);
1168
1169 scsi_unblock_requests(shost);
1170
1171 return err ? 1 : 0;
1172}
1173
1174static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1175{
1176 struct Scsi_Host *shost = usb_get_intfdata(intf);
1177 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1178
1179 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1180 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1181 return -ETIME;
1182 }
1183
1184 return 0;
1185}
1186
1187static int uas_resume(struct usb_interface *intf)
1188{
1189 return 0;
1190}
1191
1192static int uas_reset_resume(struct usb_interface *intf)
1193{
1194 struct Scsi_Host *shost = usb_get_intfdata(intf);
1195 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1196 unsigned long flags;
1197 int err;
1198
1199 err = uas_configure_endpoints(devinfo);
1200 if (err) {
1201 shost_printk(KERN_ERR, shost,
1202 "%s: alloc streams error %d after reset",
1203 __func__, err);
1204 return -EIO;
1205 }
1206
1207 spin_lock_irqsave(shost->host_lock, flags);
1208 scsi_report_bus_reset(shost, 0);
1209 spin_unlock_irqrestore(lock: shost->host_lock, flags);
1210
1211 return 0;
1212}
1213
1214static void uas_disconnect(struct usb_interface *intf)
1215{
1216 struct Scsi_Host *shost = usb_get_intfdata(intf);
1217 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1218 unsigned long flags;
1219
1220 spin_lock_irqsave(&devinfo->lock, flags);
1221 devinfo->resetting = 1;
1222 spin_unlock_irqrestore(lock: &devinfo->lock, flags);
1223
1224 cancel_work_sync(work: &devinfo->work);
1225 usb_kill_anchored_urbs(anchor: &devinfo->cmd_urbs);
1226 usb_kill_anchored_urbs(anchor: &devinfo->sense_urbs);
1227 usb_kill_anchored_urbs(anchor: &devinfo->data_urbs);
1228 uas_zap_pending(devinfo, result: DID_NO_CONNECT);
1229
1230 /*
1231 * Prevent SCSI scanning (if it hasn't started yet)
1232 * or wait for the SCSI-scanning routine to stop.
1233 */
1234 cancel_work_sync(work: &devinfo->scan_work);
1235
1236 scsi_remove_host(shost);
1237 uas_free_streams(devinfo);
1238 scsi_host_put(t: shost);
1239}
1240
1241/*
1242 * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1243 * hang on reboot when the device is still in uas mode. Note the reset is
1244 * necessary as some devices won't revert to usb-storage mode without it.
1245 */
1246static void uas_shutdown(struct usb_interface *intf)
1247{
1248 struct usb_device *udev = interface_to_usbdev(intf);
1249 struct Scsi_Host *shost = usb_get_intfdata(intf);
1250 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1251
1252 if (system_state != SYSTEM_RESTART)
1253 return;
1254
1255 devinfo->shutdown = 1;
1256 uas_free_streams(devinfo);
1257 usb_set_interface(dev: udev, ifnum: intf->altsetting[0].desc.bInterfaceNumber, alternate: 0);
1258 usb_reset_device(dev: udev);
1259}
1260
1261static struct usb_driver uas_driver = {
1262 .name = "uas",
1263 .probe = uas_probe,
1264 .disconnect = uas_disconnect,
1265 .pre_reset = uas_pre_reset,
1266 .post_reset = uas_post_reset,
1267 .suspend = uas_suspend,
1268 .resume = uas_resume,
1269 .reset_resume = uas_reset_resume,
1270 .shutdown = uas_shutdown,
1271 .id_table = uas_usb_ids,
1272};
1273
1274static int __init uas_init(void)
1275{
1276 int rv;
1277
1278 workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM | WQ_PERCPU, 0);
1279 if (!workqueue)
1280 return -ENOMEM;
1281
1282 rv = usb_register(&uas_driver);
1283 if (rv) {
1284 destroy_workqueue(wq: workqueue);
1285 return -ENOMEM;
1286 }
1287
1288 return 0;
1289}
1290
1291static void __exit uas_exit(void)
1292{
1293 usb_deregister(&uas_driver);
1294 destroy_workqueue(wq: workqueue);
1295}
1296
1297module_init(uas_init);
1298module_exit(uas_exit);
1299
1300MODULE_DESCRIPTION("USB Attached SCSI driver");
1301MODULE_LICENSE("GPL");
1302MODULE_IMPORT_NS("USB_STORAGE");
1303MODULE_AUTHOR(
1304 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
1305

source code of linux/drivers/usb/storage/uas.c