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Merge tag 'v4.7' into for-linus/pstore
[deliverable/linux.git] / drivers / usb / storage / uas.c
1 /*
2 * USB Attached SCSI
3 * Note that this is not the same as the USB Mass Storage driver
4 *
5 * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2016
6 * Copyright Matthew Wilcox for Intel Corp, 2010
7 * Copyright Sarah Sharp for Intel Corp, 2010
8 *
9 * Distributed under the terms of the GNU GPL, version two.
10 */
11
12 #include <linux/blkdev.h>
13 #include <linux/slab.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/usb.h>
17 #include <linux/usb_usual.h>
18 #include <linux/usb/hcd.h>
19 #include <linux/usb/storage.h>
20 #include <linux/usb/uas.h>
21
22 #include <scsi/scsi.h>
23 #include <scsi/scsi_eh.h>
24 #include <scsi/scsi_dbg.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
35 struct 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 unsigned long 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 };
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 static void uas_do_work(struct work_struct *work)
85 {
86 struct uas_dev_info *devinfo =
87 container_of(work, struct uas_dev_info, work);
88 struct uas_cmd_info *cmdinfo;
89 struct scsi_cmnd *cmnd;
90 unsigned long flags;
91 int i, err;
92
93 spin_lock_irqsave(&devinfo->lock, flags);
94
95 if (devinfo->resetting)
96 goto out;
97
98 for (i = 0; i < devinfo->qdepth; i++) {
99 if (!devinfo->cmnd[i])
100 continue;
101
102 cmnd = devinfo->cmnd[i];
103 cmdinfo = (void *)&cmnd->SCp;
104
105 if (!(cmdinfo->state & IS_IN_WORK_LIST))
106 continue;
107
108 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
109 if (!err)
110 cmdinfo->state &= ~IS_IN_WORK_LIST;
111 else
112 schedule_work(&devinfo->work);
113 }
114 out:
115 spin_unlock_irqrestore(&devinfo->lock, flags);
116 }
117
118 static void uas_add_work(struct uas_cmd_info *cmdinfo)
119 {
120 struct scsi_pointer *scp = (void *)cmdinfo;
121 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
122 struct uas_dev_info *devinfo = cmnd->device->hostdata;
123
124 lockdep_assert_held(&devinfo->lock);
125 cmdinfo->state |= IS_IN_WORK_LIST;
126 schedule_work(&devinfo->work);
127 }
128
129 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
130 {
131 struct uas_cmd_info *cmdinfo;
132 struct scsi_cmnd *cmnd;
133 unsigned long flags;
134 int i, err;
135
136 spin_lock_irqsave(&devinfo->lock, flags);
137 for (i = 0; i < devinfo->qdepth; i++) {
138 if (!devinfo->cmnd[i])
139 continue;
140
141 cmnd = devinfo->cmnd[i];
142 cmdinfo = (void *)&cmnd->SCp;
143 uas_log_cmd_state(cmnd, __func__, 0);
144 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
145 cmdinfo->state &= ~COMMAND_INFLIGHT;
146 cmnd->result = result << 16;
147 err = uas_try_complete(cmnd, __func__);
148 WARN_ON(err != 0);
149 }
150 spin_unlock_irqrestore(&devinfo->lock, flags);
151 }
152
153 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
154 {
155 struct sense_iu *sense_iu = urb->transfer_buffer;
156 struct scsi_device *sdev = cmnd->device;
157
158 if (urb->actual_length > 16) {
159 unsigned len = be16_to_cpup(&sense_iu->len);
160 if (len + 16 != urb->actual_length) {
161 int newlen = min(len + 16, urb->actual_length) - 16;
162 if (newlen < 0)
163 newlen = 0;
164 sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
165 "disagrees with IU sense data length %d, "
166 "using %d bytes of sense data\n", __func__,
167 urb->actual_length, len, newlen);
168 len = newlen;
169 }
170 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
171 }
172
173 cmnd->result = sense_iu->status;
174 }
175
176 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
177 int status)
178 {
179 struct uas_cmd_info *ci = (void *)&cmnd->SCp;
180 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
181
182 scmd_printk(KERN_INFO, cmnd,
183 "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
184 prefix, status, cmdinfo->uas_tag,
185 (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
186 (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
187 (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "",
188 (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "",
189 (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "",
190 (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "",
191 (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "",
192 (ci->state & COMMAND_INFLIGHT) ? " CMD" : "",
193 (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
194 (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
195 (ci->state & COMMAND_ABORTED) ? " abort" : "",
196 (ci->state & IS_IN_WORK_LIST) ? " work" : "");
197 scsi_print_command(cmnd);
198 }
199
200 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
201 {
202 struct uas_cmd_info *cmdinfo;
203
204 if (!cmnd)
205 return;
206
207 cmdinfo = (void *)&cmnd->SCp;
208
209 if (cmdinfo->state & SUBMIT_CMD_URB)
210 usb_free_urb(cmdinfo->cmd_urb);
211
212 /* data urbs may have never gotten their submit flag set */
213 if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
214 usb_free_urb(cmdinfo->data_in_urb);
215 if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
216 usb_free_urb(cmdinfo->data_out_urb);
217 }
218
219 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
220 {
221 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
222 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
223
224 lockdep_assert_held(&devinfo->lock);
225 if (cmdinfo->state & (COMMAND_INFLIGHT |
226 DATA_IN_URB_INFLIGHT |
227 DATA_OUT_URB_INFLIGHT |
228 COMMAND_ABORTED))
229 return -EBUSY;
230 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
231 uas_free_unsubmitted_urbs(cmnd);
232 cmnd->scsi_done(cmnd);
233 return 0;
234 }
235
236 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
237 unsigned direction)
238 {
239 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
240 int err;
241
242 cmdinfo->state |= direction | SUBMIT_STATUS_URB;
243 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
244 if (err) {
245 uas_add_work(cmdinfo);
246 }
247 }
248
249 static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
250 {
251 u8 response_code = riu->response_code;
252
253 switch (response_code) {
254 case RC_INCORRECT_LUN:
255 cmnd->result = DID_BAD_TARGET << 16;
256 break;
257 case RC_TMF_SUCCEEDED:
258 cmnd->result = DID_OK << 16;
259 break;
260 case RC_TMF_NOT_SUPPORTED:
261 cmnd->result = DID_TARGET_FAILURE << 16;
262 break;
263 default:
264 uas_log_cmd_state(cmnd, "response iu", response_code);
265 cmnd->result = DID_ERROR << 16;
266 break;
267 }
268
269 return response_code == RC_TMF_SUCCEEDED;
270 }
271
272 static void uas_stat_cmplt(struct urb *urb)
273 {
274 struct iu *iu = urb->transfer_buffer;
275 struct Scsi_Host *shost = urb->context;
276 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
277 struct urb *data_in_urb = NULL;
278 struct urb *data_out_urb = NULL;
279 struct scsi_cmnd *cmnd;
280 struct uas_cmd_info *cmdinfo;
281 unsigned long flags;
282 unsigned int idx;
283 int status = urb->status;
284 bool success;
285
286 spin_lock_irqsave(&devinfo->lock, flags);
287
288 if (devinfo->resetting)
289 goto out;
290
291 if (status) {
292 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
293 dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
294 goto out;
295 }
296
297 idx = be16_to_cpup(&iu->tag) - 1;
298 if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
299 dev_err(&urb->dev->dev,
300 "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
301 goto out;
302 }
303
304 cmnd = devinfo->cmnd[idx];
305 cmdinfo = (void *)&cmnd->SCp;
306
307 if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
308 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
309 goto out;
310 }
311
312 switch (iu->iu_id) {
313 case IU_ID_STATUS:
314 uas_sense(urb, cmnd);
315 if (cmnd->result != 0) {
316 /* cancel data transfers on error */
317 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
318 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
319 }
320 cmdinfo->state &= ~COMMAND_INFLIGHT;
321 uas_try_complete(cmnd, __func__);
322 break;
323 case IU_ID_READ_READY:
324 if (!cmdinfo->data_in_urb ||
325 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
326 uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
327 break;
328 }
329 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
330 break;
331 case IU_ID_WRITE_READY:
332 if (!cmdinfo->data_out_urb ||
333 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
334 uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
335 break;
336 }
337 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
338 break;
339 case IU_ID_RESPONSE:
340 cmdinfo->state &= ~COMMAND_INFLIGHT;
341 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
342 if (!success) {
343 /* Error, cancel data transfers */
344 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
345 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
346 }
347 uas_try_complete(cmnd, __func__);
348 break;
349 default:
350 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
351 }
352 out:
353 usb_free_urb(urb);
354 spin_unlock_irqrestore(&devinfo->lock, flags);
355
356 /* Unlinking of data urbs must be done without holding the lock */
357 if (data_in_urb) {
358 usb_unlink_urb(data_in_urb);
359 usb_put_urb(data_in_urb);
360 }
361 if (data_out_urb) {
362 usb_unlink_urb(data_out_urb);
363 usb_put_urb(data_out_urb);
364 }
365 }
366
367 static void uas_data_cmplt(struct urb *urb)
368 {
369 struct scsi_cmnd *cmnd = urb->context;
370 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
371 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
372 struct scsi_data_buffer *sdb = NULL;
373 unsigned long flags;
374 int status = urb->status;
375
376 spin_lock_irqsave(&devinfo->lock, flags);
377
378 if (cmdinfo->data_in_urb == urb) {
379 sdb = scsi_in(cmnd);
380 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
381 cmdinfo->data_in_urb = NULL;
382 } else if (cmdinfo->data_out_urb == urb) {
383 sdb = scsi_out(cmnd);
384 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
385 cmdinfo->data_out_urb = NULL;
386 }
387 if (sdb == NULL) {
388 WARN_ON_ONCE(1);
389 goto out;
390 }
391
392 if (devinfo->resetting)
393 goto out;
394
395 /* Data urbs should not complete before the cmd urb is submitted */
396 if (cmdinfo->state & SUBMIT_CMD_URB) {
397 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
398 goto out;
399 }
400
401 if (status) {
402 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
403 uas_log_cmd_state(cmnd, "data cmplt err", status);
404 /* error: no data transfered */
405 sdb->resid = sdb->length;
406 } else {
407 sdb->resid = sdb->length - urb->actual_length;
408 }
409 uas_try_complete(cmnd, __func__);
410 out:
411 usb_free_urb(urb);
412 spin_unlock_irqrestore(&devinfo->lock, flags);
413 }
414
415 static void uas_cmd_cmplt(struct urb *urb)
416 {
417 if (urb->status)
418 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
419
420 usb_free_urb(urb);
421 }
422
423 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
424 struct scsi_cmnd *cmnd,
425 enum dma_data_direction dir)
426 {
427 struct usb_device *udev = devinfo->udev;
428 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
429 struct urb *urb = usb_alloc_urb(0, gfp);
430 struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
431 ? scsi_in(cmnd) : scsi_out(cmnd);
432 unsigned int pipe = (dir == DMA_FROM_DEVICE)
433 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
434
435 if (!urb)
436 goto out;
437 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
438 uas_data_cmplt, cmnd);
439 if (devinfo->use_streams)
440 urb->stream_id = cmdinfo->uas_tag;
441 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
442 urb->sg = sdb->table.sgl;
443 out:
444 return urb;
445 }
446
447 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
448 struct scsi_cmnd *cmnd)
449 {
450 struct usb_device *udev = devinfo->udev;
451 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
452 struct urb *urb = usb_alloc_urb(0, gfp);
453 struct sense_iu *iu;
454
455 if (!urb)
456 goto out;
457
458 iu = kzalloc(sizeof(*iu), gfp);
459 if (!iu)
460 goto free;
461
462 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
463 uas_stat_cmplt, cmnd->device->host);
464 if (devinfo->use_streams)
465 urb->stream_id = cmdinfo->uas_tag;
466 urb->transfer_flags |= URB_FREE_BUFFER;
467 out:
468 return urb;
469 free:
470 usb_free_urb(urb);
471 return NULL;
472 }
473
474 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
475 struct scsi_cmnd *cmnd)
476 {
477 struct usb_device *udev = devinfo->udev;
478 struct scsi_device *sdev = cmnd->device;
479 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
480 struct urb *urb = usb_alloc_urb(0, gfp);
481 struct command_iu *iu;
482 int len;
483
484 if (!urb)
485 goto out;
486
487 len = cmnd->cmd_len - 16;
488 if (len < 0)
489 len = 0;
490 len = ALIGN(len, 4);
491 iu = kzalloc(sizeof(*iu) + len, gfp);
492 if (!iu)
493 goto free;
494
495 iu->iu_id = IU_ID_COMMAND;
496 iu->tag = cpu_to_be16(cmdinfo->uas_tag);
497 iu->prio_attr = UAS_SIMPLE_TAG;
498 iu->len = len;
499 int_to_scsilun(sdev->lun, &iu->lun);
500 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
501
502 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
503 uas_cmd_cmplt, NULL);
504 urb->transfer_flags |= URB_FREE_BUFFER;
505 out:
506 return urb;
507 free:
508 usb_free_urb(urb);
509 return NULL;
510 }
511
512 /*
513 * Why should I request the Status IU before sending the Command IU? Spec
514 * says to, but also says the device may receive them in any order. Seems
515 * daft to me.
516 */
517
518 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
519 {
520 struct uas_dev_info *devinfo = cmnd->device->hostdata;
521 struct urb *urb;
522 int err;
523
524 urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
525 if (!urb)
526 return NULL;
527 usb_anchor_urb(urb, &devinfo->sense_urbs);
528 err = usb_submit_urb(urb, gfp);
529 if (err) {
530 usb_unanchor_urb(urb);
531 uas_log_cmd_state(cmnd, "sense submit err", err);
532 usb_free_urb(urb);
533 return NULL;
534 }
535 return urb;
536 }
537
538 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
539 struct uas_dev_info *devinfo)
540 {
541 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
542 struct urb *urb;
543 int err;
544
545 lockdep_assert_held(&devinfo->lock);
546 if (cmdinfo->state & SUBMIT_STATUS_URB) {
547 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
548 if (!urb)
549 return SCSI_MLQUEUE_DEVICE_BUSY;
550 cmdinfo->state &= ~SUBMIT_STATUS_URB;
551 }
552
553 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
554 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
555 cmnd, DMA_FROM_DEVICE);
556 if (!cmdinfo->data_in_urb)
557 return SCSI_MLQUEUE_DEVICE_BUSY;
558 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
559 }
560
561 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
562 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
563 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
564 if (err) {
565 usb_unanchor_urb(cmdinfo->data_in_urb);
566 uas_log_cmd_state(cmnd, "data in submit err", err);
567 return SCSI_MLQUEUE_DEVICE_BUSY;
568 }
569 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
570 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
571 }
572
573 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
574 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
575 cmnd, DMA_TO_DEVICE);
576 if (!cmdinfo->data_out_urb)
577 return SCSI_MLQUEUE_DEVICE_BUSY;
578 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
579 }
580
581 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
582 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
583 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
584 if (err) {
585 usb_unanchor_urb(cmdinfo->data_out_urb);
586 uas_log_cmd_state(cmnd, "data out submit err", err);
587 return SCSI_MLQUEUE_DEVICE_BUSY;
588 }
589 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
590 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
591 }
592
593 if (cmdinfo->state & ALLOC_CMD_URB) {
594 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
595 if (!cmdinfo->cmd_urb)
596 return SCSI_MLQUEUE_DEVICE_BUSY;
597 cmdinfo->state &= ~ALLOC_CMD_URB;
598 }
599
600 if (cmdinfo->state & SUBMIT_CMD_URB) {
601 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
602 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
603 if (err) {
604 usb_unanchor_urb(cmdinfo->cmd_urb);
605 uas_log_cmd_state(cmnd, "cmd submit err", err);
606 return SCSI_MLQUEUE_DEVICE_BUSY;
607 }
608 cmdinfo->cmd_urb = NULL;
609 cmdinfo->state &= ~SUBMIT_CMD_URB;
610 cmdinfo->state |= COMMAND_INFLIGHT;
611 }
612
613 return 0;
614 }
615
616 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
617 void (*done)(struct scsi_cmnd *))
618 {
619 struct scsi_device *sdev = cmnd->device;
620 struct uas_dev_info *devinfo = sdev->hostdata;
621 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
622 unsigned long flags;
623 int idx, err;
624
625 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
626
627 /* Re-check scsi_block_requests now that we've the host-lock */
628 if (cmnd->device->host->host_self_blocked)
629 return SCSI_MLQUEUE_DEVICE_BUSY;
630
631 if ((devinfo->flags & US_FL_NO_ATA_1X) &&
632 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
633 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
634 sizeof(usb_stor_sense_invalidCDB));
635 cmnd->result = SAM_STAT_CHECK_CONDITION;
636 cmnd->scsi_done(cmnd);
637 return 0;
638 }
639
640 spin_lock_irqsave(&devinfo->lock, flags);
641
642 if (devinfo->resetting) {
643 cmnd->result = DID_ERROR << 16;
644 cmnd->scsi_done(cmnd);
645 spin_unlock_irqrestore(&devinfo->lock, flags);
646 return 0;
647 }
648
649 /* Find a free uas-tag */
650 for (idx = 0; idx < devinfo->qdepth; idx++) {
651 if (!devinfo->cmnd[idx])
652 break;
653 }
654 if (idx == devinfo->qdepth) {
655 spin_unlock_irqrestore(&devinfo->lock, flags);
656 return SCSI_MLQUEUE_DEVICE_BUSY;
657 }
658
659 cmnd->scsi_done = done;
660
661 memset(cmdinfo, 0, sizeof(*cmdinfo));
662 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
663 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
664
665 switch (cmnd->sc_data_direction) {
666 case DMA_FROM_DEVICE:
667 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
668 break;
669 case DMA_BIDIRECTIONAL:
670 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
671 case DMA_TO_DEVICE:
672 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
673 case DMA_NONE:
674 break;
675 }
676
677 if (!devinfo->use_streams)
678 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
679
680 err = uas_submit_urbs(cmnd, devinfo);
681 if (err) {
682 /* If we did nothing, give up now */
683 if (cmdinfo->state & SUBMIT_STATUS_URB) {
684 spin_unlock_irqrestore(&devinfo->lock, flags);
685 return SCSI_MLQUEUE_DEVICE_BUSY;
686 }
687 uas_add_work(cmdinfo);
688 }
689
690 devinfo->cmnd[idx] = cmnd;
691 spin_unlock_irqrestore(&devinfo->lock, flags);
692 return 0;
693 }
694
695 static DEF_SCSI_QCMD(uas_queuecommand)
696
697 /*
698 * For now we do not support actually sending an abort to the device, so
699 * this eh always fails. Still we must define it to make sure that we've
700 * dropped all references to the cmnd in question once this function exits.
701 */
702 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
703 {
704 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
705 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
706 struct urb *data_in_urb = NULL;
707 struct urb *data_out_urb = NULL;
708 unsigned long flags;
709
710 spin_lock_irqsave(&devinfo->lock, flags);
711
712 uas_log_cmd_state(cmnd, __func__, 0);
713
714 /* Ensure that try_complete does not call scsi_done */
715 cmdinfo->state |= COMMAND_ABORTED;
716
717 /* Drop all refs to this cmnd, kill data urbs to break their ref */
718 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
719 if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
720 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
721 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
722 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
723
724 uas_free_unsubmitted_urbs(cmnd);
725
726 spin_unlock_irqrestore(&devinfo->lock, flags);
727
728 if (data_in_urb) {
729 usb_kill_urb(data_in_urb);
730 usb_put_urb(data_in_urb);
731 }
732 if (data_out_urb) {
733 usb_kill_urb(data_out_urb);
734 usb_put_urb(data_out_urb);
735 }
736
737 return FAILED;
738 }
739
740 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
741 {
742 struct scsi_device *sdev = cmnd->device;
743 struct uas_dev_info *devinfo = sdev->hostdata;
744 struct usb_device *udev = devinfo->udev;
745 unsigned long flags;
746 int err;
747
748 err = usb_lock_device_for_reset(udev, devinfo->intf);
749 if (err) {
750 shost_printk(KERN_ERR, sdev->host,
751 "%s FAILED to get lock err %d\n", __func__, err);
752 return FAILED;
753 }
754
755 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
756
757 spin_lock_irqsave(&devinfo->lock, flags);
758 devinfo->resetting = 1;
759 spin_unlock_irqrestore(&devinfo->lock, flags);
760
761 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
762 usb_kill_anchored_urbs(&devinfo->sense_urbs);
763 usb_kill_anchored_urbs(&devinfo->data_urbs);
764 uas_zap_pending(devinfo, DID_RESET);
765
766 err = usb_reset_device(udev);
767
768 spin_lock_irqsave(&devinfo->lock, flags);
769 devinfo->resetting = 0;
770 spin_unlock_irqrestore(&devinfo->lock, flags);
771
772 usb_unlock_device(udev);
773
774 if (err) {
775 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
776 __func__, err);
777 return FAILED;
778 }
779
780 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
781 return SUCCESS;
782 }
783
784 static int uas_target_alloc(struct scsi_target *starget)
785 {
786 struct uas_dev_info *devinfo = (struct uas_dev_info *)
787 dev_to_shost(starget->dev.parent)->hostdata;
788
789 if (devinfo->flags & US_FL_NO_REPORT_LUNS)
790 starget->no_report_luns = 1;
791
792 return 0;
793 }
794
795 static int uas_slave_alloc(struct scsi_device *sdev)
796 {
797 struct uas_dev_info *devinfo =
798 (struct uas_dev_info *)sdev->host->hostdata;
799
800 sdev->hostdata = devinfo;
801
802 /*
803 * USB has unusual DMA-alignment requirements: Although the
804 * starting address of each scatter-gather element doesn't matter,
805 * the length of each element except the last must be divisible
806 * by the Bulk maxpacket value. There's currently no way to
807 * express this by block-layer constraints, so we'll cop out
808 * and simply require addresses to be aligned at 512-byte
809 * boundaries. This is okay since most block I/O involves
810 * hardware sectors that are multiples of 512 bytes in length,
811 * and since host controllers up through USB 2.0 have maxpacket
812 * values no larger than 512.
813 *
814 * But it doesn't suffice for Wireless USB, where Bulk maxpacket
815 * values can be as large as 2048. To make that work properly
816 * will require changes to the block layer.
817 */
818 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
819
820 if (devinfo->flags & US_FL_MAX_SECTORS_64)
821 blk_queue_max_hw_sectors(sdev->request_queue, 64);
822 else if (devinfo->flags & US_FL_MAX_SECTORS_240)
823 blk_queue_max_hw_sectors(sdev->request_queue, 240);
824
825 return 0;
826 }
827
828 static int uas_slave_configure(struct scsi_device *sdev)
829 {
830 struct uas_dev_info *devinfo = sdev->hostdata;
831
832 if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
833 sdev->no_report_opcodes = 1;
834
835 /* A few buggy USB-ATA bridges don't understand FUA */
836 if (devinfo->flags & US_FL_BROKEN_FUA)
837 sdev->broken_fua = 1;
838
839 scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
840 return 0;
841 }
842
843 static struct scsi_host_template uas_host_template = {
844 .module = THIS_MODULE,
845 .name = "uas",
846 .queuecommand = uas_queuecommand,
847 .target_alloc = uas_target_alloc,
848 .slave_alloc = uas_slave_alloc,
849 .slave_configure = uas_slave_configure,
850 .eh_abort_handler = uas_eh_abort_handler,
851 .eh_bus_reset_handler = uas_eh_bus_reset_handler,
852 .this_id = -1,
853 .sg_tablesize = SG_NONE,
854 .skip_settle_delay = 1,
855 };
856
857 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
858 vendorName, productName, useProtocol, useTransport, \
859 initFunction, flags) \
860 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
861 .driver_info = (flags) }
862
863 static struct usb_device_id uas_usb_ids[] = {
864 # include "unusual_uas.h"
865 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
866 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
867 { }
868 };
869 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
870
871 #undef UNUSUAL_DEV
872
873 static int uas_switch_interface(struct usb_device *udev,
874 struct usb_interface *intf)
875 {
876 int alt;
877
878 alt = uas_find_uas_alt_setting(intf);
879 if (alt < 0)
880 return alt;
881
882 return usb_set_interface(udev,
883 intf->altsetting[0].desc.bInterfaceNumber, alt);
884 }
885
886 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
887 {
888 struct usb_host_endpoint *eps[4] = { };
889 struct usb_device *udev = devinfo->udev;
890 int r;
891
892 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
893 if (r)
894 return r;
895
896 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
897 usb_endpoint_num(&eps[0]->desc));
898 devinfo->status_pipe = usb_rcvbulkpipe(udev,
899 usb_endpoint_num(&eps[1]->desc));
900 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
901 usb_endpoint_num(&eps[2]->desc));
902 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
903 usb_endpoint_num(&eps[3]->desc));
904
905 if (udev->speed < USB_SPEED_SUPER) {
906 devinfo->qdepth = 32;
907 devinfo->use_streams = 0;
908 } else {
909 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
910 3, MAX_CMNDS, GFP_NOIO);
911 if (devinfo->qdepth < 0)
912 return devinfo->qdepth;
913 devinfo->use_streams = 1;
914 }
915
916 return 0;
917 }
918
919 static void uas_free_streams(struct uas_dev_info *devinfo)
920 {
921 struct usb_device *udev = devinfo->udev;
922 struct usb_host_endpoint *eps[3];
923
924 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
925 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
926 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
927 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
928 }
929
930 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
931 {
932 int result = -ENOMEM;
933 struct Scsi_Host *shost = NULL;
934 struct uas_dev_info *devinfo;
935 struct usb_device *udev = interface_to_usbdev(intf);
936 unsigned long dev_flags;
937
938 if (!uas_use_uas_driver(intf, id, &dev_flags))
939 return -ENODEV;
940
941 if (uas_switch_interface(udev, intf))
942 return -ENODEV;
943
944 shost = scsi_host_alloc(&uas_host_template,
945 sizeof(struct uas_dev_info));
946 if (!shost)
947 goto set_alt0;
948
949 shost->max_cmd_len = 16 + 252;
950 shost->max_id = 1;
951 shost->max_lun = 256;
952 shost->max_channel = 0;
953 shost->sg_tablesize = udev->bus->sg_tablesize;
954
955 devinfo = (struct uas_dev_info *)shost->hostdata;
956 devinfo->intf = intf;
957 devinfo->udev = udev;
958 devinfo->resetting = 0;
959 devinfo->shutdown = 0;
960 devinfo->flags = dev_flags;
961 init_usb_anchor(&devinfo->cmd_urbs);
962 init_usb_anchor(&devinfo->sense_urbs);
963 init_usb_anchor(&devinfo->data_urbs);
964 spin_lock_init(&devinfo->lock);
965 INIT_WORK(&devinfo->work, uas_do_work);
966
967 result = uas_configure_endpoints(devinfo);
968 if (result)
969 goto set_alt0;
970
971 /*
972 * 1 tag is reserved for untagged commands +
973 * 1 tag to avoid off by one errors in some bridge firmwares
974 */
975 shost->can_queue = devinfo->qdepth - 2;
976
977 usb_set_intfdata(intf, shost);
978 result = scsi_add_host(shost, &intf->dev);
979 if (result)
980 goto free_streams;
981
982 scsi_scan_host(shost);
983 return result;
984
985 free_streams:
986 uas_free_streams(devinfo);
987 usb_set_intfdata(intf, NULL);
988 set_alt0:
989 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
990 if (shost)
991 scsi_host_put(shost);
992 return result;
993 }
994
995 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
996 {
997 unsigned long flags;
998 int i, r = 1;
999
1000 spin_lock_irqsave(&devinfo->lock, flags);
1001
1002 for (i = 0; i < devinfo->qdepth; i++) {
1003 if (devinfo->cmnd[i]) {
1004 r = 0; /* Not empty */
1005 break;
1006 }
1007 }
1008
1009 spin_unlock_irqrestore(&devinfo->lock, flags);
1010
1011 return r;
1012 }
1013
1014 /*
1015 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1016 * get empty while there still is more work to do due to sense-urbs completing
1017 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1018 */
1019 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1020 {
1021 unsigned long start_time;
1022 int r;
1023
1024 start_time = jiffies;
1025 do {
1026 flush_work(&devinfo->work);
1027
1028 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1029 if (r == 0)
1030 return -ETIME;
1031
1032 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1033 if (r == 0)
1034 return -ETIME;
1035
1036 if (time_after(jiffies, start_time + 5 * HZ))
1037 return -ETIME;
1038 } while (!uas_cmnd_list_empty(devinfo));
1039
1040 return 0;
1041 }
1042
1043 static int uas_pre_reset(struct usb_interface *intf)
1044 {
1045 struct Scsi_Host *shost = usb_get_intfdata(intf);
1046 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1047 unsigned long flags;
1048
1049 if (devinfo->shutdown)
1050 return 0;
1051
1052 /* Block new requests */
1053 spin_lock_irqsave(shost->host_lock, flags);
1054 scsi_block_requests(shost);
1055 spin_unlock_irqrestore(shost->host_lock, flags);
1056
1057 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1058 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1059 scsi_unblock_requests(shost);
1060 return 1;
1061 }
1062
1063 uas_free_streams(devinfo);
1064
1065 return 0;
1066 }
1067
1068 static int uas_post_reset(struct usb_interface *intf)
1069 {
1070 struct Scsi_Host *shost = usb_get_intfdata(intf);
1071 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1072 unsigned long flags;
1073 int err;
1074
1075 if (devinfo->shutdown)
1076 return 0;
1077
1078 err = uas_configure_endpoints(devinfo);
1079 if (err) {
1080 shost_printk(KERN_ERR, shost,
1081 "%s: alloc streams error %d after reset",
1082 __func__, err);
1083 return 1;
1084 }
1085
1086 spin_lock_irqsave(shost->host_lock, flags);
1087 scsi_report_bus_reset(shost, 0);
1088 spin_unlock_irqrestore(shost->host_lock, flags);
1089
1090 scsi_unblock_requests(shost);
1091
1092 return 0;
1093 }
1094
1095 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1096 {
1097 struct Scsi_Host *shost = usb_get_intfdata(intf);
1098 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1099
1100 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1101 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1102 return -ETIME;
1103 }
1104
1105 return 0;
1106 }
1107
1108 static int uas_resume(struct usb_interface *intf)
1109 {
1110 return 0;
1111 }
1112
1113 static int uas_reset_resume(struct usb_interface *intf)
1114 {
1115 struct Scsi_Host *shost = usb_get_intfdata(intf);
1116 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1117 unsigned long flags;
1118 int err;
1119
1120 err = uas_configure_endpoints(devinfo);
1121 if (err) {
1122 shost_printk(KERN_ERR, shost,
1123 "%s: alloc streams error %d after reset",
1124 __func__, err);
1125 return -EIO;
1126 }
1127
1128 spin_lock_irqsave(shost->host_lock, flags);
1129 scsi_report_bus_reset(shost, 0);
1130 spin_unlock_irqrestore(shost->host_lock, flags);
1131
1132 return 0;
1133 }
1134
1135 static void uas_disconnect(struct usb_interface *intf)
1136 {
1137 struct Scsi_Host *shost = usb_get_intfdata(intf);
1138 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1139 unsigned long flags;
1140
1141 spin_lock_irqsave(&devinfo->lock, flags);
1142 devinfo->resetting = 1;
1143 spin_unlock_irqrestore(&devinfo->lock, flags);
1144
1145 cancel_work_sync(&devinfo->work);
1146 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1147 usb_kill_anchored_urbs(&devinfo->sense_urbs);
1148 usb_kill_anchored_urbs(&devinfo->data_urbs);
1149 uas_zap_pending(devinfo, DID_NO_CONNECT);
1150
1151 scsi_remove_host(shost);
1152 uas_free_streams(devinfo);
1153 scsi_host_put(shost);
1154 }
1155
1156 /*
1157 * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1158 * hang on reboot when the device is still in uas mode. Note the reset is
1159 * necessary as some devices won't revert to usb-storage mode without it.
1160 */
1161 static void uas_shutdown(struct device *dev)
1162 {
1163 struct usb_interface *intf = to_usb_interface(dev);
1164 struct usb_device *udev = interface_to_usbdev(intf);
1165 struct Scsi_Host *shost = usb_get_intfdata(intf);
1166 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1167
1168 if (system_state != SYSTEM_RESTART)
1169 return;
1170
1171 devinfo->shutdown = 1;
1172 uas_free_streams(devinfo);
1173 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1174 usb_reset_device(udev);
1175 }
1176
1177 static struct usb_driver uas_driver = {
1178 .name = "uas",
1179 .probe = uas_probe,
1180 .disconnect = uas_disconnect,
1181 .pre_reset = uas_pre_reset,
1182 .post_reset = uas_post_reset,
1183 .suspend = uas_suspend,
1184 .resume = uas_resume,
1185 .reset_resume = uas_reset_resume,
1186 .drvwrap.driver.shutdown = uas_shutdown,
1187 .id_table = uas_usb_ids,
1188 };
1189
1190 module_usb_driver(uas_driver);
1191
1192 MODULE_LICENSE("GPL");
1193 MODULE_AUTHOR(
1194 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
Linux kernel - Deliverables
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