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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
34struct 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;
49};
50
51enum {
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
67struct 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
76static int uas_submit_urbs(struct scsi_cmnd *cmnd,
77 struct uas_dev_info *devinfo);
78static void uas_do_work(struct work_struct *work);
79static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
80static void uas_free_streams(struct uas_dev_info *devinfo);
81static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
82 int status);
83
84
85
86
87
88
89
90
91
92
93
94
95static struct workqueue_struct *workqueue;
96
97static 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 = (void *)&cmnd->SCp;
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 }
127out:
128 spin_unlock_irqrestore(&devinfo->lock, flags);
129}
130
131static 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
142static void uas_add_work(struct uas_cmd_info *cmdinfo)
143{
144 struct scsi_pointer *scp = (void *)cmdinfo;
145 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
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(workqueue, &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 = (void *)&cmnd->SCp;
167 uas_log_cmd_state(cmnd, __func__, 0);
168
169 cmdinfo->state &= ~COMMAND_INFLIGHT;
170 cmnd->result = result << 16;
171 err = uas_try_complete(cmnd, __func__);
172 WARN_ON(err != 0);
173 }
174 spin_unlock_irqrestore(&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(&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 = (void *)&cmnd->SCp;
204 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
205
206 if (status == -ENODEV)
207 return;
208
209 scmd_printk(KERN_INFO, cmnd,
210 "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
211 prefix, status, cmdinfo->uas_tag,
212 (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
213 (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
214 (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "",
215 (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "",
216 (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "",
217 (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "",
218 (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "",
219 (ci->state & COMMAND_INFLIGHT) ? " CMD" : "",
220 (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
221 (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
222 (ci->state & COMMAND_ABORTED) ? " abort" : "",
223 (ci->state & IS_IN_WORK_LIST) ? " work" : "");
224 scsi_print_command(cmnd);
225}
226
227static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
228{
229 struct uas_cmd_info *cmdinfo;
230
231 if (!cmnd)
232 return;
233
234 cmdinfo = (void *)&cmnd->SCp;
235
236 if (cmdinfo->state & SUBMIT_CMD_URB)
237 usb_free_urb(cmdinfo->cmd_urb);
238
239
240 if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
241 usb_free_urb(cmdinfo->data_in_urb);
242 if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
243 usb_free_urb(cmdinfo->data_out_urb);
244}
245
246static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
247{
248 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
249 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
250
251 lockdep_assert_held(&devinfo->lock);
252 if (cmdinfo->state & (COMMAND_INFLIGHT |
253 DATA_IN_URB_INFLIGHT |
254 DATA_OUT_URB_INFLIGHT |
255 COMMAND_ABORTED))
256 return -EBUSY;
257 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
258 uas_free_unsubmitted_urbs(cmnd);
259 scsi_done(cmnd);
260 return 0;
261}
262
263static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
264 unsigned direction)
265{
266 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
267 int err;
268
269 cmdinfo->state |= direction | SUBMIT_STATUS_URB;
270 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
271 if (err) {
272 uas_add_work(cmdinfo);
273 }
274}
275
276static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
277{
278 u8 response_code = riu->response_code;
279
280 switch (response_code) {
281 case RC_INCORRECT_LUN:
282 set_host_byte(cmnd, DID_BAD_TARGET);
283 break;
284 case RC_TMF_SUCCEEDED:
285 set_host_byte(cmnd, DID_OK);
286 break;
287 case RC_TMF_NOT_SUPPORTED:
288 set_host_byte(cmnd, DID_TARGET_FAILURE);
289 break;
290 default:
291 uas_log_cmd_state(cmnd, "response iu", response_code);
292 set_host_byte(cmnd, DID_ERROR);
293 break;
294 }
295
296 return response_code == RC_TMF_SUCCEEDED;
297}
298
299static void uas_stat_cmplt(struct urb *urb)
300{
301 struct iu *iu = urb->transfer_buffer;
302 struct Scsi_Host *shost = urb->context;
303 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
304 struct urb *data_in_urb = NULL;
305 struct urb *data_out_urb = NULL;
306 struct scsi_cmnd *cmnd;
307 struct uas_cmd_info *cmdinfo;
308 unsigned long flags;
309 unsigned int idx;
310 int status = urb->status;
311 bool success;
312
313 spin_lock_irqsave(&devinfo->lock, flags);
314
315 if (devinfo->resetting)
316 goto out;
317
318 if (status) {
319 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
320 dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
321 goto out;
322 }
323
324 idx = be16_to_cpup(&iu->tag) - 1;
325 if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
326 dev_err(&urb->dev->dev,
327 "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
328 goto out;
329 }
330
331 cmnd = devinfo->cmnd[idx];
332 cmdinfo = (void *)&cmnd->SCp;
333
334 if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
335 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
336 goto out;
337 }
338
339 switch (iu->iu_id) {
340 case IU_ID_STATUS:
341 uas_sense(urb, cmnd);
342 if (cmnd->result != 0) {
343
344 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
345 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
346 }
347 cmdinfo->state &= ~COMMAND_INFLIGHT;
348 uas_try_complete(cmnd, __func__);
349 break;
350 case IU_ID_READ_READY:
351 if (!cmdinfo->data_in_urb ||
352 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
353 uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
354 break;
355 }
356 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
357 break;
358 case IU_ID_WRITE_READY:
359 if (!cmdinfo->data_out_urb ||
360 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
361 uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
362 break;
363 }
364 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
365 break;
366 case IU_ID_RESPONSE:
367 cmdinfo->state &= ~COMMAND_INFLIGHT;
368 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
369 if (!success) {
370
371 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
372 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
373 }
374 uas_try_complete(cmnd, __func__);
375 break;
376 default:
377 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
378 }
379out:
380 usb_free_urb(urb);
381 spin_unlock_irqrestore(&devinfo->lock, flags);
382
383
384 if (data_in_urb) {
385 usb_unlink_urb(data_in_urb);
386 usb_put_urb(data_in_urb);
387 }
388 if (data_out_urb) {
389 usb_unlink_urb(data_out_urb);
390 usb_put_urb(data_out_urb);
391 }
392}
393
394static void uas_data_cmplt(struct urb *urb)
395{
396 struct scsi_cmnd *cmnd = urb->context;
397 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
398 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
399 struct scsi_data_buffer *sdb = &cmnd->sdb;
400 unsigned long flags;
401 int status = urb->status;
402
403 spin_lock_irqsave(&devinfo->lock, flags);
404
405 if (cmdinfo->data_in_urb == urb) {
406 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
407 cmdinfo->data_in_urb = NULL;
408 } else if (cmdinfo->data_out_urb == urb) {
409 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
410 cmdinfo->data_out_urb = NULL;
411 }
412
413 if (devinfo->resetting)
414 goto out;
415
416
417 if (cmdinfo->state & SUBMIT_CMD_URB) {
418 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
419 goto out;
420 }
421
422 if (status) {
423 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
424 uas_log_cmd_state(cmnd, "data cmplt err", status);
425
426 scsi_set_resid(cmnd, sdb->length);
427 } else {
428 scsi_set_resid(cmnd, sdb->length - urb->actual_length);
429 }
430 uas_try_complete(cmnd, __func__);
431out:
432 usb_free_urb(urb);
433 spin_unlock_irqrestore(&devinfo->lock, flags);
434}
435
436static void uas_cmd_cmplt(struct urb *urb)
437{
438 if (urb->status)
439 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
440
441 usb_free_urb(urb);
442}
443
444static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
445 struct scsi_cmnd *cmnd,
446 enum dma_data_direction dir)
447{
448 struct usb_device *udev = devinfo->udev;
449 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
450 struct urb *urb = usb_alloc_urb(0, gfp);
451 struct scsi_data_buffer *sdb = &cmnd->sdb;
452 unsigned int pipe = (dir == DMA_FROM_DEVICE)
453 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
454
455 if (!urb)
456 goto out;
457 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
458 uas_data_cmplt, cmnd);
459 if (devinfo->use_streams)
460 urb->stream_id = cmdinfo->uas_tag;
461 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
462 urb->sg = sdb->table.sgl;
463 out:
464 return urb;
465}
466
467static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
468 struct scsi_cmnd *cmnd)
469{
470 struct usb_device *udev = devinfo->udev;
471 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
472 struct urb *urb = usb_alloc_urb(0, gfp);
473 struct sense_iu *iu;
474
475 if (!urb)
476 goto out;
477
478 iu = kzalloc(sizeof(*iu), gfp);
479 if (!iu)
480 goto free;
481
482 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
483 uas_stat_cmplt, cmnd->device->host);
484 if (devinfo->use_streams)
485 urb->stream_id = cmdinfo->uas_tag;
486 urb->transfer_flags |= URB_FREE_BUFFER;
487 out:
488 return urb;
489 free:
490 usb_free_urb(urb);
491 return NULL;
492}
493
494static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
495 struct scsi_cmnd *cmnd)
496{
497 struct usb_device *udev = devinfo->udev;
498 struct scsi_device *sdev = cmnd->device;
499 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
500 struct urb *urb = usb_alloc_urb(0, gfp);
501 struct command_iu *iu;
502 int len;
503
504 if (!urb)
505 goto out;
506
507 len = cmnd->cmd_len - 16;
508 if (len < 0)
509 len = 0;
510 len = ALIGN(len, 4);
511 iu = kzalloc(sizeof(*iu) + len, gfp);
512 if (!iu)
513 goto free;
514
515 iu->iu_id = IU_ID_COMMAND;
516 iu->tag = cpu_to_be16(cmdinfo->uas_tag);
517 iu->prio_attr = UAS_SIMPLE_TAG;
518 iu->len = len;
519 int_to_scsilun(sdev->lun, &iu->lun);
520 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
521
522 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
523 uas_cmd_cmplt, NULL);
524 urb->transfer_flags |= URB_FREE_BUFFER;
525 out:
526 return urb;
527 free:
528 usb_free_urb(urb);
529 return NULL;
530}
531
532
533
534
535
536
537
538static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
539{
540 struct uas_dev_info *devinfo = cmnd->device->hostdata;
541 struct urb *urb;
542 int err;
543
544 urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
545 if (!urb)
546 return NULL;
547 usb_anchor_urb(urb, &devinfo->sense_urbs);
548 err = usb_submit_urb(urb, gfp);
549 if (err) {
550 usb_unanchor_urb(urb);
551 uas_log_cmd_state(cmnd, "sense submit err", err);
552 usb_free_urb(urb);
553 return NULL;
554 }
555 return urb;
556}
557
558static int uas_submit_urbs(struct scsi_cmnd *cmnd,
559 struct uas_dev_info *devinfo)
560{
561 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
562 struct urb *urb;
563 int err;
564
565 lockdep_assert_held(&devinfo->lock);
566 if (cmdinfo->state & SUBMIT_STATUS_URB) {
567 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
568 if (!urb)
569 return SCSI_MLQUEUE_DEVICE_BUSY;
570 cmdinfo->state &= ~SUBMIT_STATUS_URB;
571 }
572
573 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
574 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
575 cmnd, DMA_FROM_DEVICE);
576 if (!cmdinfo->data_in_urb)
577 return SCSI_MLQUEUE_DEVICE_BUSY;
578 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
579 }
580
581 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
582 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
583 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
584 if (err) {
585 usb_unanchor_urb(cmdinfo->data_in_urb);
586 uas_log_cmd_state(cmnd, "data in submit err", err);
587 return SCSI_MLQUEUE_DEVICE_BUSY;
588 }
589 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
590 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
591 }
592
593 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
594 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
595 cmnd, DMA_TO_DEVICE);
596 if (!cmdinfo->data_out_urb)
597 return SCSI_MLQUEUE_DEVICE_BUSY;
598 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
599 }
600
601 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
602 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
603 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
604 if (err) {
605 usb_unanchor_urb(cmdinfo->data_out_urb);
606 uas_log_cmd_state(cmnd, "data out submit err", err);
607 return SCSI_MLQUEUE_DEVICE_BUSY;
608 }
609 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
610 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
611 }
612
613 if (cmdinfo->state & ALLOC_CMD_URB) {
614 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
615 if (!cmdinfo->cmd_urb)
616 return SCSI_MLQUEUE_DEVICE_BUSY;
617 cmdinfo->state &= ~ALLOC_CMD_URB;
618 }
619
620 if (cmdinfo->state & SUBMIT_CMD_URB) {
621 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
622 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
623 if (err) {
624 usb_unanchor_urb(cmdinfo->cmd_urb);
625 uas_log_cmd_state(cmnd, "cmd submit err", err);
626 return SCSI_MLQUEUE_DEVICE_BUSY;
627 }
628 cmdinfo->cmd_urb = NULL;
629 cmdinfo->state &= ~SUBMIT_CMD_URB;
630 cmdinfo->state |= COMMAND_INFLIGHT;
631 }
632
633 return 0;
634}
635
636static int uas_queuecommand_lck(struct scsi_cmnd *cmnd)
637{
638 struct scsi_device *sdev = cmnd->device;
639 struct uas_dev_info *devinfo = sdev->hostdata;
640 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
641 unsigned long flags;
642 int idx, err;
643
644 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
645
646
647 if (cmnd->device->host->host_self_blocked)
648 return SCSI_MLQUEUE_DEVICE_BUSY;
649
650 if ((devinfo->flags & US_FL_NO_ATA_1X) &&
651 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
652 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
653 sizeof(usb_stor_sense_invalidCDB));
654 cmnd->result = SAM_STAT_CHECK_CONDITION;
655 scsi_done(cmnd);
656 return 0;
657 }
658
659 spin_lock_irqsave(&devinfo->lock, flags);
660
661 if (devinfo->resetting) {
662 set_host_byte(cmnd, DID_ERROR);
663 scsi_done(cmnd);
664 goto zombie;
665 }
666
667
668 for (idx = 0; idx < devinfo->qdepth; idx++) {
669 if (!devinfo->cmnd[idx])
670 break;
671 }
672 if (idx == devinfo->qdepth) {
673 spin_unlock_irqrestore(&devinfo->lock, flags);
674 return SCSI_MLQUEUE_DEVICE_BUSY;
675 }
676
677 memset(cmdinfo, 0, sizeof(*cmdinfo));
678 cmdinfo->uas_tag = idx + 1;
679 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
680
681 switch (cmnd->sc_data_direction) {
682 case DMA_FROM_DEVICE:
683 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
684 break;
685 case DMA_BIDIRECTIONAL:
686 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
687 fallthrough;
688 case DMA_TO_DEVICE:
689 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
690 break;
691 case DMA_NONE:
692 break;
693 }
694
695 if (!devinfo->use_streams)
696 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
697
698 err = uas_submit_urbs(cmnd, devinfo);
699
700
701
702
703
704 if (err == -ENODEV) {
705 set_host_byte(cmnd, DID_ERROR);
706 scsi_done(cmnd);
707 goto zombie;
708 }
709 if (err) {
710
711 if (cmdinfo->state & SUBMIT_STATUS_URB) {
712 spin_unlock_irqrestore(&devinfo->lock, flags);
713 return SCSI_MLQUEUE_DEVICE_BUSY;
714 }
715 uas_add_work(cmdinfo);
716 }
717
718 devinfo->cmnd[idx] = cmnd;
719zombie:
720 spin_unlock_irqrestore(&devinfo->lock, flags);
721 return 0;
722}
723
724static DEF_SCSI_QCMD(uas_queuecommand)
725
726
727
728
729
730
731static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
732{
733 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
734 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
735 struct urb *data_in_urb = NULL;
736 struct urb *data_out_urb = NULL;
737 unsigned long flags;
738
739 spin_lock_irqsave(&devinfo->lock, flags);
740
741 uas_log_cmd_state(cmnd, __func__, 0);
742
743
744 cmdinfo->state |= COMMAND_ABORTED;
745
746
747 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
748 if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
749 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
750 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
751 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
752
753 uas_free_unsubmitted_urbs(cmnd);
754
755 spin_unlock_irqrestore(&devinfo->lock, flags);
756
757 if (data_in_urb) {
758 usb_kill_urb(data_in_urb);
759 usb_put_urb(data_in_urb);
760 }
761 if (data_out_urb) {
762 usb_kill_urb(data_out_urb);
763 usb_put_urb(data_out_urb);
764 }
765
766 return FAILED;
767}
768
769static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
770{
771 struct scsi_device *sdev = cmnd->device;
772 struct uas_dev_info *devinfo = sdev->hostdata;
773 struct usb_device *udev = devinfo->udev;
774 unsigned long flags;
775 int err;
776
777 err = usb_lock_device_for_reset(udev, devinfo->intf);
778 if (err) {
779 shost_printk(KERN_ERR, sdev->host,
780 "%s FAILED to get lock err %d\n", __func__, err);
781 return FAILED;
782 }
783
784 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
785
786 spin_lock_irqsave(&devinfo->lock, flags);
787 devinfo->resetting = 1;
788 spin_unlock_irqrestore(&devinfo->lock, flags);
789
790 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
791 usb_kill_anchored_urbs(&devinfo->sense_urbs);
792 usb_kill_anchored_urbs(&devinfo->data_urbs);
793 uas_zap_pending(devinfo, DID_RESET);
794
795 err = usb_reset_device(udev);
796
797 spin_lock_irqsave(&devinfo->lock, flags);
798 devinfo->resetting = 0;
799 spin_unlock_irqrestore(&devinfo->lock, flags);
800
801 usb_unlock_device(udev);
802
803 if (err) {
804 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
805 __func__, err);
806 return FAILED;
807 }
808
809 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
810 return SUCCESS;
811}
812
813static int uas_target_alloc(struct scsi_target *starget)
814{
815 struct uas_dev_info *devinfo = (struct uas_dev_info *)
816 dev_to_shost(starget->dev.parent)->hostdata;
817
818 if (devinfo->flags & US_FL_NO_REPORT_LUNS)
819 starget->no_report_luns = 1;
820
821 return 0;
822}
823
824static int uas_slave_alloc(struct scsi_device *sdev)
825{
826 struct uas_dev_info *devinfo =
827 (struct uas_dev_info *)sdev->host->hostdata;
828
829 sdev->hostdata = devinfo;
830
831
832
833
834
835
836 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
837
838 if (devinfo->flags & US_FL_MAX_SECTORS_64)
839 blk_queue_max_hw_sectors(sdev->request_queue, 64);
840 else if (devinfo->flags & US_FL_MAX_SECTORS_240)
841 blk_queue_max_hw_sectors(sdev->request_queue, 240);
842
843 return 0;
844}
845
846static int uas_slave_configure(struct scsi_device *sdev)
847{
848 struct uas_dev_info *devinfo = sdev->hostdata;
849
850 if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
851 sdev->no_report_opcodes = 1;
852
853
854 if (devinfo->flags & US_FL_BROKEN_FUA)
855 sdev->broken_fua = 1;
856
857
858 if (devinfo->flags & US_FL_ALWAYS_SYNC) {
859 sdev->skip_ms_page_3f = 1;
860 sdev->skip_ms_page_8 = 1;
861 sdev->wce_default_on = 1;
862 }
863
864
865 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16)
866 sdev->no_read_capacity_16 = 1;
867
868
869 if (devinfo->flags & US_FL_NO_SAME)
870 sdev->no_write_same = 1;
871
872
873
874
875
876 if (devinfo->flags & US_FL_FIX_CAPACITY)
877 sdev->fix_capacity = 1;
878
879
880
881
882 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
883 sdev->guess_capacity = 1;
884
885
886
887
888
889
890
891
892
893
894 if (devinfo->flags & US_FL_NO_WP_DETECT)
895 sdev->skip_ms_page_3f = 1;
896
897 scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
898 return 0;
899}
900
901static struct scsi_host_template uas_host_template = {
902 .module = THIS_MODULE,
903 .name = "uas",
904 .queuecommand = uas_queuecommand,
905 .target_alloc = uas_target_alloc,
906 .slave_alloc = uas_slave_alloc,
907 .slave_configure = uas_slave_configure,
908 .eh_abort_handler = uas_eh_abort_handler,
909 .eh_device_reset_handler = uas_eh_device_reset_handler,
910 .this_id = -1,
911 .skip_settle_delay = 1,
912 .dma_boundary = PAGE_SIZE - 1,
913};
914
915#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
916 vendorName, productName, useProtocol, useTransport, \
917 initFunction, flags) \
918{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
919 .driver_info = (flags) }
920
921static struct usb_device_id uas_usb_ids[] = {
922# include "unusual_uas.h"
923 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
924 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
925 { }
926};
927MODULE_DEVICE_TABLE(usb, uas_usb_ids);
928
929#undef UNUSUAL_DEV
930
931static int uas_switch_interface(struct usb_device *udev,
932 struct usb_interface *intf)
933{
934 struct usb_host_interface *alt;
935
936 alt = uas_find_uas_alt_setting(intf);
937 if (!alt)
938 return -ENODEV;
939
940 return usb_set_interface(udev, alt->desc.bInterfaceNumber,
941 alt->desc.bAlternateSetting);
942}
943
944static int uas_configure_endpoints(struct uas_dev_info *devinfo)
945{
946 struct usb_host_endpoint *eps[4] = { };
947 struct usb_device *udev = devinfo->udev;
948 int r;
949
950 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
951 if (r)
952 return r;
953
954 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
955 usb_endpoint_num(&eps[0]->desc));
956 devinfo->status_pipe = usb_rcvbulkpipe(udev,
957 usb_endpoint_num(&eps[1]->desc));
958 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
959 usb_endpoint_num(&eps[2]->desc));
960 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
961 usb_endpoint_num(&eps[3]->desc));
962
963 if (udev->speed < USB_SPEED_SUPER) {
964 devinfo->qdepth = 32;
965 devinfo->use_streams = 0;
966 } else {
967 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
968 3, MAX_CMNDS, GFP_NOIO);
969 if (devinfo->qdepth < 0)
970 return devinfo->qdepth;
971 devinfo->use_streams = 1;
972 }
973
974 return 0;
975}
976
977static void uas_free_streams(struct uas_dev_info *devinfo)
978{
979 struct usb_device *udev = devinfo->udev;
980 struct usb_host_endpoint *eps[3];
981
982 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
983 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
984 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
985 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
986}
987
988static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
989{
990 int result = -ENOMEM;
991 struct Scsi_Host *shost = NULL;
992 struct uas_dev_info *devinfo;
993 struct usb_device *udev = interface_to_usbdev(intf);
994 unsigned long dev_flags;
995
996 if (!uas_use_uas_driver(intf, id, &dev_flags))
997 return -ENODEV;
998
999 if (uas_switch_interface(udev, intf))
1000 return -ENODEV;
1001
1002 shost = scsi_host_alloc(&uas_host_template,
1003 sizeof(struct uas_dev_info));
1004 if (!shost)
1005 goto set_alt0;
1006
1007 shost->max_cmd_len = 16 + 252;
1008 shost->max_id = 1;
1009 shost->max_lun = 256;
1010 shost->max_channel = 0;
1011 shost->sg_tablesize = udev->bus->sg_tablesize;
1012
1013 devinfo = (struct uas_dev_info *)shost->hostdata;
1014 devinfo->intf = intf;
1015 devinfo->udev = udev;
1016 devinfo->resetting = 0;
1017 devinfo->shutdown = 0;
1018 devinfo->flags = dev_flags;
1019 init_usb_anchor(&devinfo->cmd_urbs);
1020 init_usb_anchor(&devinfo->sense_urbs);
1021 init_usb_anchor(&devinfo->data_urbs);
1022 spin_lock_init(&devinfo->lock);
1023 INIT_WORK(&devinfo->work, uas_do_work);
1024 INIT_WORK(&devinfo->scan_work, uas_scan_work);
1025
1026 result = uas_configure_endpoints(devinfo);
1027 if (result)
1028 goto set_alt0;
1029
1030
1031
1032
1033
1034 shost->can_queue = devinfo->qdepth - 2;
1035
1036 usb_set_intfdata(intf, shost);
1037 result = scsi_add_host(shost, &intf->dev);
1038 if (result)
1039 goto free_streams;
1040
1041
1042 schedule_work(&devinfo->scan_work);
1043
1044 return result;
1045
1046free_streams:
1047 uas_free_streams(devinfo);
1048 usb_set_intfdata(intf, NULL);
1049set_alt0:
1050 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1051 if (shost)
1052 scsi_host_put(shost);
1053 return result;
1054}
1055
1056static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1057{
1058 unsigned long flags;
1059 int i, r = 1;
1060
1061 spin_lock_irqsave(&devinfo->lock, flags);
1062
1063 for (i = 0; i < devinfo->qdepth; i++) {
1064 if (devinfo->cmnd[i]) {
1065 r = 0;
1066 break;
1067 }
1068 }
1069
1070 spin_unlock_irqrestore(&devinfo->lock, flags);
1071
1072 return r;
1073}
1074
1075
1076
1077
1078
1079
1080static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1081{
1082 unsigned long start_time;
1083 int r;
1084
1085 start_time = jiffies;
1086 do {
1087 flush_work(&devinfo->work);
1088
1089 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1090 if (r == 0)
1091 return -ETIME;
1092
1093 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1094 if (r == 0)
1095 return -ETIME;
1096
1097 if (time_after(jiffies, start_time + 5 * HZ))
1098 return -ETIME;
1099 } while (!uas_cmnd_list_empty(devinfo));
1100
1101 return 0;
1102}
1103
1104static int uas_pre_reset(struct usb_interface *intf)
1105{
1106 struct Scsi_Host *shost = usb_get_intfdata(intf);
1107 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1108 unsigned long flags;
1109
1110 if (devinfo->shutdown)
1111 return 0;
1112
1113
1114 spin_lock_irqsave(shost->host_lock, flags);
1115 scsi_block_requests(shost);
1116 spin_unlock_irqrestore(shost->host_lock, flags);
1117
1118 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1119 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1120 scsi_unblock_requests(shost);
1121 return 1;
1122 }
1123
1124 uas_free_streams(devinfo);
1125
1126 return 0;
1127}
1128
1129static int uas_post_reset(struct usb_interface *intf)
1130{
1131 struct Scsi_Host *shost = usb_get_intfdata(intf);
1132 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1133 unsigned long flags;
1134 int err;
1135
1136 if (devinfo->shutdown)
1137 return 0;
1138
1139 err = uas_configure_endpoints(devinfo);
1140 if (err && err != -ENODEV)
1141 shost_printk(KERN_ERR, shost,
1142 "%s: alloc streams error %d after reset",
1143 __func__, err);
1144
1145
1146 spin_lock_irqsave(shost->host_lock, flags);
1147 scsi_report_bus_reset(shost, 0);
1148 spin_unlock_irqrestore(shost->host_lock, flags);
1149
1150 scsi_unblock_requests(shost);
1151
1152 return err ? 1 : 0;
1153}
1154
1155static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1156{
1157 struct Scsi_Host *shost = usb_get_intfdata(intf);
1158 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1159
1160 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1161 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1162 return -ETIME;
1163 }
1164
1165 return 0;
1166}
1167
1168static int uas_resume(struct usb_interface *intf)
1169{
1170 return 0;
1171}
1172
1173static int uas_reset_resume(struct usb_interface *intf)
1174{
1175 struct Scsi_Host *shost = usb_get_intfdata(intf);
1176 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1177 unsigned long flags;
1178 int err;
1179
1180 err = uas_configure_endpoints(devinfo);
1181 if (err) {
1182 shost_printk(KERN_ERR, shost,
1183 "%s: alloc streams error %d after reset",
1184 __func__, err);
1185 return -EIO;
1186 }
1187
1188 spin_lock_irqsave(shost->host_lock, flags);
1189 scsi_report_bus_reset(shost, 0);
1190 spin_unlock_irqrestore(shost->host_lock, flags);
1191
1192 return 0;
1193}
1194
1195static void uas_disconnect(struct usb_interface *intf)
1196{
1197 struct Scsi_Host *shost = usb_get_intfdata(intf);
1198 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1199 unsigned long flags;
1200
1201 spin_lock_irqsave(&devinfo->lock, flags);
1202 devinfo->resetting = 1;
1203 spin_unlock_irqrestore(&devinfo->lock, flags);
1204
1205 cancel_work_sync(&devinfo->work);
1206 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1207 usb_kill_anchored_urbs(&devinfo->sense_urbs);
1208 usb_kill_anchored_urbs(&devinfo->data_urbs);
1209 uas_zap_pending(devinfo, DID_NO_CONNECT);
1210
1211
1212
1213
1214
1215 cancel_work_sync(&devinfo->scan_work);
1216
1217 scsi_remove_host(shost);
1218 uas_free_streams(devinfo);
1219 scsi_host_put(shost);
1220}
1221
1222
1223
1224
1225
1226
1227static void uas_shutdown(struct device *dev)
1228{
1229 struct usb_interface *intf = to_usb_interface(dev);
1230 struct usb_device *udev = interface_to_usbdev(intf);
1231 struct Scsi_Host *shost = usb_get_intfdata(intf);
1232 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1233
1234 if (system_state != SYSTEM_RESTART)
1235 return;
1236
1237 devinfo->shutdown = 1;
1238 uas_free_streams(devinfo);
1239 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1240 usb_reset_device(udev);
1241}
1242
1243static struct usb_driver uas_driver = {
1244 .name = "uas",
1245 .probe = uas_probe,
1246 .disconnect = uas_disconnect,
1247 .pre_reset = uas_pre_reset,
1248 .post_reset = uas_post_reset,
1249 .suspend = uas_suspend,
1250 .resume = uas_resume,
1251 .reset_resume = uas_reset_resume,
1252 .drvwrap.driver.shutdown = uas_shutdown,
1253 .id_table = uas_usb_ids,
1254};
1255
1256static int __init uas_init(void)
1257{
1258 int rv;
1259
1260 workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0);
1261 if (!workqueue)
1262 return -ENOMEM;
1263
1264 rv = usb_register(&uas_driver);
1265 if (rv) {
1266 destroy_workqueue(workqueue);
1267 return -ENOMEM;
1268 }
1269
1270 return 0;
1271}
1272
1273static void __exit uas_exit(void)
1274{
1275 usb_deregister(&uas_driver);
1276 destroy_workqueue(workqueue);
1277}
1278
1279module_init(uas_init);
1280module_exit(uas_exit);
1281
1282MODULE_LICENSE("GPL");
1283MODULE_IMPORT_NS(USB_STORAGE);
1284MODULE_AUTHOR(
1285 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
1286