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