Loading...
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
35struct uas_dev_info {
36 struct usb_interface *intf;
37 struct usb_device *udev;
38 struct usb_anchor cmd_urbs;
39 struct usb_anchor sense_urbs;
40 struct usb_anchor data_urbs;
41 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
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/* Overrides scsi_pointer */
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/* I hate forward declarations, but I actually have a loop */
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
84static 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 }
114out:
115 spin_unlock_irqrestore(&devinfo->lock, flags);
116}
117
118static 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
129static 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
153static 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
176static 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
200static 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
219static 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
236static 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
249static 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
272static 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 }
352out:
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
367static 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__);
410out:
411 usb_free_urb(urb);
412 spin_unlock_irqrestore(&devinfo->lock, flags);
413}
414
415static 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
423static 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
447static 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
474static 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
518static 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
538static 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
616static 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
695static 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 */
702static 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
740static 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
784static 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
795static 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 /* USB has unusual DMA-alignment requirements: Although the
803 * starting address of each scatter-gather element doesn't matter,
804 * the length of each element except the last must be divisible
805 * by the Bulk maxpacket value. There's currently no way to
806 * express this by block-layer constraints, so we'll cop out
807 * and simply require addresses to be aligned at 512-byte
808 * boundaries. This is okay since most block I/O involves
809 * hardware sectors that are multiples of 512 bytes in length,
810 * and since host controllers up through USB 2.0 have maxpacket
811 * values no larger than 512.
812 *
813 * But it doesn't suffice for Wireless USB, where Bulk maxpacket
814 * values can be as large as 2048. To make that work properly
815 * will require changes to the block layer.
816 */
817 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
818
819 if (devinfo->flags & US_FL_MAX_SECTORS_64)
820 blk_queue_max_hw_sectors(sdev->request_queue, 64);
821 else if (devinfo->flags & US_FL_MAX_SECTORS_240)
822 blk_queue_max_hw_sectors(sdev->request_queue, 240);
823
824 return 0;
825}
826
827static int uas_slave_configure(struct scsi_device *sdev)
828{
829 struct uas_dev_info *devinfo = sdev->hostdata;
830
831 if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
832 sdev->no_report_opcodes = 1;
833
834 /* A few buggy USB-ATA bridges don't understand FUA */
835 if (devinfo->flags & US_FL_BROKEN_FUA)
836 sdev->broken_fua = 1;
837
838 return 0;
839}
840
841static struct scsi_host_template uas_host_template = {
842 .module = THIS_MODULE,
843 .name = "uas",
844 .queuecommand = uas_queuecommand,
845 .target_alloc = uas_target_alloc,
846 .slave_alloc = uas_slave_alloc,
847 .slave_configure = uas_slave_configure,
848 .eh_abort_handler = uas_eh_abort_handler,
849 .eh_bus_reset_handler = uas_eh_bus_reset_handler,
850 .can_queue = MAX_CMNDS,
851 .this_id = -1,
852 .sg_tablesize = SG_NONE,
853 .skip_settle_delay = 1,
854};
855
856#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
857 vendorName, productName, useProtocol, useTransport, \
858 initFunction, flags) \
859{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
860 .driver_info = (flags) }
861
862static struct usb_device_id uas_usb_ids[] = {
863# include "unusual_uas.h"
864 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
865 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
866 { }
867};
868MODULE_DEVICE_TABLE(usb, uas_usb_ids);
869
870#undef UNUSUAL_DEV
871
872static int uas_switch_interface(struct usb_device *udev,
873 struct usb_interface *intf)
874{
875 int alt;
876
877 alt = uas_find_uas_alt_setting(intf);
878 if (alt < 0)
879 return alt;
880
881 return usb_set_interface(udev,
882 intf->altsetting[0].desc.bInterfaceNumber, alt);
883}
884
885static int uas_configure_endpoints(struct uas_dev_info *devinfo)
886{
887 struct usb_host_endpoint *eps[4] = { };
888 struct usb_device *udev = devinfo->udev;
889 int r;
890
891 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
892 if (r)
893 return r;
894
895 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
896 usb_endpoint_num(&eps[0]->desc));
897 devinfo->status_pipe = usb_rcvbulkpipe(udev,
898 usb_endpoint_num(&eps[1]->desc));
899 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
900 usb_endpoint_num(&eps[2]->desc));
901 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
902 usb_endpoint_num(&eps[3]->desc));
903
904 if (udev->speed < USB_SPEED_SUPER) {
905 devinfo->qdepth = 32;
906 devinfo->use_streams = 0;
907 } else {
908 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
909 3, MAX_CMNDS, GFP_NOIO);
910 if (devinfo->qdepth < 0)
911 return devinfo->qdepth;
912 devinfo->use_streams = 1;
913 }
914
915 return 0;
916}
917
918static void uas_free_streams(struct uas_dev_info *devinfo)
919{
920 struct usb_device *udev = devinfo->udev;
921 struct usb_host_endpoint *eps[3];
922
923 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
924 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
925 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
926 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
927}
928
929static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
930{
931 int result = -ENOMEM;
932 struct Scsi_Host *shost = NULL;
933 struct uas_dev_info *devinfo;
934 struct usb_device *udev = interface_to_usbdev(intf);
935 unsigned long dev_flags;
936
937 if (!uas_use_uas_driver(intf, id, &dev_flags))
938 return -ENODEV;
939
940 if (uas_switch_interface(udev, intf))
941 return -ENODEV;
942
943 shost = scsi_host_alloc(&uas_host_template,
944 sizeof(struct uas_dev_info));
945 if (!shost)
946 goto set_alt0;
947
948 shost->max_cmd_len = 16 + 252;
949 shost->max_id = 1;
950 shost->max_lun = 256;
951 shost->max_channel = 0;
952 shost->sg_tablesize = udev->bus->sg_tablesize;
953
954 devinfo = (struct uas_dev_info *)shost->hostdata;
955 devinfo->intf = intf;
956 devinfo->udev = udev;
957 devinfo->resetting = 0;
958 devinfo->shutdown = 0;
959 devinfo->flags = dev_flags;
960 init_usb_anchor(&devinfo->cmd_urbs);
961 init_usb_anchor(&devinfo->sense_urbs);
962 init_usb_anchor(&devinfo->data_urbs);
963 spin_lock_init(&devinfo->lock);
964 INIT_WORK(&devinfo->work, uas_do_work);
965
966 result = uas_configure_endpoints(devinfo);
967 if (result)
968 goto set_alt0;
969
970 /*
971 * 1 tag is reserved for untagged commands +
972 * 1 tag to avoid off by one errors in some bridge firmwares
973 */
974 shost->can_queue = devinfo->qdepth - 2;
975
976 usb_set_intfdata(intf, shost);
977 result = scsi_add_host(shost, &intf->dev);
978 if (result)
979 goto free_streams;
980
981 scsi_scan_host(shost);
982 return result;
983
984free_streams:
985 uas_free_streams(devinfo);
986 usb_set_intfdata(intf, NULL);
987set_alt0:
988 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
989 if (shost)
990 scsi_host_put(shost);
991 return result;
992}
993
994static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
995{
996 unsigned long flags;
997 int i, r = 1;
998
999 spin_lock_irqsave(&devinfo->lock, flags);
1000
1001 for (i = 0; i < devinfo->qdepth; i++) {
1002 if (devinfo->cmnd[i]) {
1003 r = 0; /* Not empty */
1004 break;
1005 }
1006 }
1007
1008 spin_unlock_irqrestore(&devinfo->lock, flags);
1009
1010 return r;
1011}
1012
1013/*
1014 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1015 * get empty while there still is more work to do due to sense-urbs completing
1016 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1017 */
1018static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1019{
1020 unsigned long start_time;
1021 int r;
1022
1023 start_time = jiffies;
1024 do {
1025 flush_work(&devinfo->work);
1026
1027 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1028 if (r == 0)
1029 return -ETIME;
1030
1031 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1032 if (r == 0)
1033 return -ETIME;
1034
1035 if (time_after(jiffies, start_time + 5 * HZ))
1036 return -ETIME;
1037 } while (!uas_cmnd_list_empty(devinfo));
1038
1039 return 0;
1040}
1041
1042static int uas_pre_reset(struct usb_interface *intf)
1043{
1044 struct Scsi_Host *shost = usb_get_intfdata(intf);
1045 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1046 unsigned long flags;
1047
1048 if (devinfo->shutdown)
1049 return 0;
1050
1051 /* Block new requests */
1052 spin_lock_irqsave(shost->host_lock, flags);
1053 scsi_block_requests(shost);
1054 spin_unlock_irqrestore(shost->host_lock, flags);
1055
1056 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1057 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1058 scsi_unblock_requests(shost);
1059 return 1;
1060 }
1061
1062 uas_free_streams(devinfo);
1063
1064 return 0;
1065}
1066
1067static int uas_post_reset(struct usb_interface *intf)
1068{
1069 struct Scsi_Host *shost = usb_get_intfdata(intf);
1070 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1071 unsigned long flags;
1072 int err;
1073
1074 if (devinfo->shutdown)
1075 return 0;
1076
1077 err = uas_configure_endpoints(devinfo);
1078 if (err) {
1079 shost_printk(KERN_ERR, shost,
1080 "%s: alloc streams error %d after reset",
1081 __func__, err);
1082 return 1;
1083 }
1084
1085 spin_lock_irqsave(shost->host_lock, flags);
1086 scsi_report_bus_reset(shost, 0);
1087 spin_unlock_irqrestore(shost->host_lock, flags);
1088
1089 scsi_unblock_requests(shost);
1090
1091 return 0;
1092}
1093
1094static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1095{
1096 struct Scsi_Host *shost = usb_get_intfdata(intf);
1097 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1098
1099 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1100 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1101 return -ETIME;
1102 }
1103
1104 return 0;
1105}
1106
1107static int uas_resume(struct usb_interface *intf)
1108{
1109 return 0;
1110}
1111
1112static int uas_reset_resume(struct usb_interface *intf)
1113{
1114 struct Scsi_Host *shost = usb_get_intfdata(intf);
1115 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1116 unsigned long flags;
1117 int err;
1118
1119 err = uas_configure_endpoints(devinfo);
1120 if (err) {
1121 shost_printk(KERN_ERR, shost,
1122 "%s: alloc streams error %d after reset",
1123 __func__, err);
1124 return -EIO;
1125 }
1126
1127 spin_lock_irqsave(shost->host_lock, flags);
1128 scsi_report_bus_reset(shost, 0);
1129 spin_unlock_irqrestore(shost->host_lock, flags);
1130
1131 return 0;
1132}
1133
1134static void uas_disconnect(struct usb_interface *intf)
1135{
1136 struct Scsi_Host *shost = usb_get_intfdata(intf);
1137 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1138 unsigned long flags;
1139
1140 spin_lock_irqsave(&devinfo->lock, flags);
1141 devinfo->resetting = 1;
1142 spin_unlock_irqrestore(&devinfo->lock, flags);
1143
1144 cancel_work_sync(&devinfo->work);
1145 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1146 usb_kill_anchored_urbs(&devinfo->sense_urbs);
1147 usb_kill_anchored_urbs(&devinfo->data_urbs);
1148 uas_zap_pending(devinfo, DID_NO_CONNECT);
1149
1150 scsi_remove_host(shost);
1151 uas_free_streams(devinfo);
1152 scsi_host_put(shost);
1153}
1154
1155/*
1156 * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1157 * hang on reboot when the device is still in uas mode. Note the reset is
1158 * necessary as some devices won't revert to usb-storage mode without it.
1159 */
1160static void uas_shutdown(struct device *dev)
1161{
1162 struct usb_interface *intf = to_usb_interface(dev);
1163 struct usb_device *udev = interface_to_usbdev(intf);
1164 struct Scsi_Host *shost = usb_get_intfdata(intf);
1165 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1166
1167 if (system_state != SYSTEM_RESTART)
1168 return;
1169
1170 devinfo->shutdown = 1;
1171 uas_free_streams(devinfo);
1172 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1173 usb_reset_device(udev);
1174}
1175
1176static struct usb_driver uas_driver = {
1177 .name = "uas",
1178 .probe = uas_probe,
1179 .disconnect = uas_disconnect,
1180 .pre_reset = uas_pre_reset,
1181 .post_reset = uas_post_reset,
1182 .suspend = uas_suspend,
1183 .resume = uas_resume,
1184 .reset_resume = uas_reset_resume,
1185 .drvwrap.driver.shutdown = uas_shutdown,
1186 .id_table = uas_usb_ids,
1187};
1188
1189module_usb_driver(uas_driver);
1190
1191MODULE_LICENSE("GPL");
1192MODULE_AUTHOR(
1193 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
1/*
2 * USB Attached SCSI
3 * Note that this is not the same as the USB Mass Storage driver
4 *
5 * Copyright Matthew Wilcox for Intel Corp, 2010
6 * Copyright Sarah Sharp for Intel Corp, 2010
7 *
8 * Distributed under the terms of the GNU GPL, version two.
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/hcd.h>
17#include <linux/usb/storage.h>
18#include <linux/usb/uas.h>
19
20#include <scsi/scsi.h>
21#include <scsi/scsi_dbg.h>
22#include <scsi/scsi_cmnd.h>
23#include <scsi/scsi_device.h>
24#include <scsi/scsi_host.h>
25#include <scsi/scsi_tcq.h>
26
27/*
28 * The r00-r01c specs define this version of the SENSE IU data structure.
29 * It's still in use by several different firmware releases.
30 */
31struct sense_iu_old {
32 __u8 iu_id;
33 __u8 rsvd1;
34 __be16 tag;
35 __be16 len;
36 __u8 status;
37 __u8 service_response;
38 __u8 sense[SCSI_SENSE_BUFFERSIZE];
39};
40
41struct uas_dev_info {
42 struct usb_interface *intf;
43 struct usb_device *udev;
44 int qdepth;
45 unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
46 unsigned use_streams:1;
47 unsigned uas_sense_old:1;
48 struct scsi_cmnd *cmnd;
49 struct urb *status_urb; /* used only if stream support is available */
50};
51
52enum {
53 ALLOC_STATUS_URB = (1 << 0),
54 SUBMIT_STATUS_URB = (1 << 1),
55 ALLOC_DATA_IN_URB = (1 << 2),
56 SUBMIT_DATA_IN_URB = (1 << 3),
57 ALLOC_DATA_OUT_URB = (1 << 4),
58 SUBMIT_DATA_OUT_URB = (1 << 5),
59 ALLOC_CMD_URB = (1 << 6),
60 SUBMIT_CMD_URB = (1 << 7),
61};
62
63/* Overrides scsi_pointer */
64struct uas_cmd_info {
65 unsigned int state;
66 unsigned int stream;
67 struct urb *cmd_urb;
68 /* status_urb is used only if stream support isn't available */
69 struct urb *status_urb;
70 struct urb *data_in_urb;
71 struct urb *data_out_urb;
72 struct list_head list;
73};
74
75/* I hate forward declarations, but I actually have a loop */
76static int uas_submit_urbs(struct scsi_cmnd *cmnd,
77 struct uas_dev_info *devinfo, gfp_t gfp);
78static void uas_do_work(struct work_struct *work);
79
80static DECLARE_WORK(uas_work, uas_do_work);
81static DEFINE_SPINLOCK(uas_work_lock);
82static LIST_HEAD(uas_work_list);
83
84static void uas_do_work(struct work_struct *work)
85{
86 struct uas_cmd_info *cmdinfo;
87 struct uas_cmd_info *temp;
88 struct list_head list;
89 int err;
90
91 spin_lock_irq(&uas_work_lock);
92 list_replace_init(&uas_work_list, &list);
93 spin_unlock_irq(&uas_work_lock);
94
95 list_for_each_entry_safe(cmdinfo, temp, &list, list) {
96 struct scsi_pointer *scp = (void *)cmdinfo;
97 struct scsi_cmnd *cmnd = container_of(scp,
98 struct scsi_cmnd, SCp);
99 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_NOIO);
100 if (err) {
101 list_del(&cmdinfo->list);
102 spin_lock_irq(&uas_work_lock);
103 list_add_tail(&cmdinfo->list, &uas_work_list);
104 spin_unlock_irq(&uas_work_lock);
105 schedule_work(&uas_work);
106 }
107 }
108}
109
110static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
111{
112 struct sense_iu *sense_iu = urb->transfer_buffer;
113 struct scsi_device *sdev = cmnd->device;
114
115 if (urb->actual_length > 16) {
116 unsigned len = be16_to_cpup(&sense_iu->len);
117 if (len + 16 != urb->actual_length) {
118 int newlen = min(len + 16, urb->actual_length) - 16;
119 if (newlen < 0)
120 newlen = 0;
121 sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
122 "disagrees with IU sense data length %d, "
123 "using %d bytes of sense data\n", __func__,
124 urb->actual_length, len, newlen);
125 len = newlen;
126 }
127 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
128 }
129
130 cmnd->result = sense_iu->status;
131 cmnd->scsi_done(cmnd);
132}
133
134static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
135{
136 struct sense_iu_old *sense_iu = urb->transfer_buffer;
137 struct scsi_device *sdev = cmnd->device;
138
139 if (urb->actual_length > 8) {
140 unsigned len = be16_to_cpup(&sense_iu->len) - 2;
141 if (len + 8 != urb->actual_length) {
142 int newlen = min(len + 8, urb->actual_length) - 8;
143 if (newlen < 0)
144 newlen = 0;
145 sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
146 "disagrees with IU sense data length %d, "
147 "using %d bytes of sense data\n", __func__,
148 urb->actual_length, len, newlen);
149 len = newlen;
150 }
151 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
152 }
153
154 cmnd->result = sense_iu->status;
155 cmnd->scsi_done(cmnd);
156}
157
158static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
159 unsigned direction)
160{
161 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
162 int err;
163
164 cmdinfo->state = direction;
165 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
166 if (err) {
167 spin_lock(&uas_work_lock);
168 list_add_tail(&cmdinfo->list, &uas_work_list);
169 spin_unlock(&uas_work_lock);
170 schedule_work(&uas_work);
171 }
172}
173
174static void uas_stat_cmplt(struct urb *urb)
175{
176 struct iu *iu = urb->transfer_buffer;
177 struct Scsi_Host *shost = urb->context;
178 struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
179 struct scsi_cmnd *cmnd;
180 u16 tag;
181 int ret;
182
183 if (urb->status) {
184 dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status);
185 if (devinfo->use_streams)
186 usb_free_urb(urb);
187 return;
188 }
189
190 tag = be16_to_cpup(&iu->tag) - 1;
191 if (tag == 0)
192 cmnd = devinfo->cmnd;
193 else
194 cmnd = scsi_host_find_tag(shost, tag - 1);
195 if (!cmnd) {
196 if (devinfo->use_streams) {
197 usb_free_urb(urb);
198 return;
199 }
200 ret = usb_submit_urb(urb, GFP_ATOMIC);
201 if (ret)
202 dev_err(&urb->dev->dev, "failed submit status urb\n");
203 return;
204 }
205
206 switch (iu->iu_id) {
207 case IU_ID_STATUS:
208 if (devinfo->cmnd == cmnd)
209 devinfo->cmnd = NULL;
210
211 if (urb->actual_length < 16)
212 devinfo->uas_sense_old = 1;
213 if (devinfo->uas_sense_old)
214 uas_sense_old(urb, cmnd);
215 else
216 uas_sense(urb, cmnd);
217 break;
218 case IU_ID_READ_READY:
219 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
220 break;
221 case IU_ID_WRITE_READY:
222 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
223 break;
224 default:
225 scmd_printk(KERN_ERR, cmnd,
226 "Bogus IU (%d) received on status pipe\n", iu->iu_id);
227 }
228
229 if (devinfo->use_streams) {
230 usb_free_urb(urb);
231 return;
232 }
233
234 ret = usb_submit_urb(urb, GFP_ATOMIC);
235 if (ret)
236 dev_err(&urb->dev->dev, "failed submit status urb\n");
237}
238
239static void uas_data_cmplt(struct urb *urb)
240{
241 struct scsi_data_buffer *sdb = urb->context;
242 sdb->resid = sdb->length - urb->actual_length;
243 usb_free_urb(urb);
244}
245
246static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
247 unsigned int pipe, u16 stream_id,
248 struct scsi_data_buffer *sdb,
249 enum dma_data_direction dir)
250{
251 struct usb_device *udev = devinfo->udev;
252 struct urb *urb = usb_alloc_urb(0, gfp);
253
254 if (!urb)
255 goto out;
256 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, uas_data_cmplt,
257 sdb);
258 if (devinfo->use_streams)
259 urb->stream_id = stream_id;
260 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
261 urb->sg = sdb->table.sgl;
262 out:
263 return urb;
264}
265
266static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
267 struct Scsi_Host *shost, u16 stream_id)
268{
269 struct usb_device *udev = devinfo->udev;
270 struct urb *urb = usb_alloc_urb(0, gfp);
271 struct sense_iu *iu;
272
273 if (!urb)
274 goto out;
275
276 iu = kzalloc(sizeof(*iu), gfp);
277 if (!iu)
278 goto free;
279
280 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
281 uas_stat_cmplt, shost);
282 urb->stream_id = stream_id;
283 urb->transfer_flags |= URB_FREE_BUFFER;
284 out:
285 return urb;
286 free:
287 usb_free_urb(urb);
288 return NULL;
289}
290
291static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
292 struct scsi_cmnd *cmnd, u16 stream_id)
293{
294 struct usb_device *udev = devinfo->udev;
295 struct scsi_device *sdev = cmnd->device;
296 struct urb *urb = usb_alloc_urb(0, gfp);
297 struct command_iu *iu;
298 int len;
299
300 if (!urb)
301 goto out;
302
303 len = cmnd->cmd_len - 16;
304 if (len < 0)
305 len = 0;
306 len = ALIGN(len, 4);
307 iu = kzalloc(sizeof(*iu) + len, gfp);
308 if (!iu)
309 goto free;
310
311 iu->iu_id = IU_ID_COMMAND;
312 if (blk_rq_tagged(cmnd->request))
313 iu->tag = cpu_to_be16(cmnd->request->tag + 2);
314 else
315 iu->tag = cpu_to_be16(1);
316 iu->prio_attr = UAS_SIMPLE_TAG;
317 iu->len = len;
318 int_to_scsilun(sdev->lun, &iu->lun);
319 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
320
321 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
322 usb_free_urb, NULL);
323 urb->transfer_flags |= URB_FREE_BUFFER;
324 out:
325 return urb;
326 free:
327 usb_free_urb(urb);
328 return NULL;
329}
330
331/*
332 * Why should I request the Status IU before sending the Command IU? Spec
333 * says to, but also says the device may receive them in any order. Seems
334 * daft to me.
335 */
336
337static int uas_submit_urbs(struct scsi_cmnd *cmnd,
338 struct uas_dev_info *devinfo, gfp_t gfp)
339{
340 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
341
342 if (cmdinfo->state & ALLOC_STATUS_URB) {
343 cmdinfo->status_urb = uas_alloc_sense_urb(devinfo, gfp,
344 cmnd->device->host, cmdinfo->stream);
345 if (!cmdinfo->status_urb)
346 return SCSI_MLQUEUE_DEVICE_BUSY;
347 cmdinfo->state &= ~ALLOC_STATUS_URB;
348 }
349
350 if (cmdinfo->state & SUBMIT_STATUS_URB) {
351 if (usb_submit_urb(cmdinfo->status_urb, gfp)) {
352 scmd_printk(KERN_INFO, cmnd,
353 "sense urb submission failure\n");
354 return SCSI_MLQUEUE_DEVICE_BUSY;
355 }
356 cmdinfo->state &= ~SUBMIT_STATUS_URB;
357 }
358
359 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
360 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
361 devinfo->data_in_pipe, cmdinfo->stream,
362 scsi_in(cmnd), DMA_FROM_DEVICE);
363 if (!cmdinfo->data_in_urb)
364 return SCSI_MLQUEUE_DEVICE_BUSY;
365 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
366 }
367
368 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
369 if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
370 scmd_printk(KERN_INFO, cmnd,
371 "data in urb submission failure\n");
372 return SCSI_MLQUEUE_DEVICE_BUSY;
373 }
374 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
375 }
376
377 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
378 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
379 devinfo->data_out_pipe, cmdinfo->stream,
380 scsi_out(cmnd), DMA_TO_DEVICE);
381 if (!cmdinfo->data_out_urb)
382 return SCSI_MLQUEUE_DEVICE_BUSY;
383 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
384 }
385
386 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
387 if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
388 scmd_printk(KERN_INFO, cmnd,
389 "data out urb submission failure\n");
390 return SCSI_MLQUEUE_DEVICE_BUSY;
391 }
392 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
393 }
394
395 if (cmdinfo->state & ALLOC_CMD_URB) {
396 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd,
397 cmdinfo->stream);
398 if (!cmdinfo->cmd_urb)
399 return SCSI_MLQUEUE_DEVICE_BUSY;
400 cmdinfo->state &= ~ALLOC_CMD_URB;
401 }
402
403 if (cmdinfo->state & SUBMIT_CMD_URB) {
404 if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
405 scmd_printk(KERN_INFO, cmnd,
406 "cmd urb submission failure\n");
407 return SCSI_MLQUEUE_DEVICE_BUSY;
408 }
409 cmdinfo->state &= ~SUBMIT_CMD_URB;
410 }
411
412 return 0;
413}
414
415static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
416 void (*done)(struct scsi_cmnd *))
417{
418 struct scsi_device *sdev = cmnd->device;
419 struct uas_dev_info *devinfo = sdev->hostdata;
420 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
421 int err;
422
423 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
424
425 if (devinfo->cmnd)
426 return SCSI_MLQUEUE_DEVICE_BUSY;
427
428 if (blk_rq_tagged(cmnd->request)) {
429 cmdinfo->stream = cmnd->request->tag + 2;
430 } else {
431 devinfo->cmnd = cmnd;
432 cmdinfo->stream = 1;
433 }
434
435 cmnd->scsi_done = done;
436
437 cmdinfo->state = ALLOC_STATUS_URB | SUBMIT_STATUS_URB |
438 ALLOC_CMD_URB | SUBMIT_CMD_URB;
439
440 switch (cmnd->sc_data_direction) {
441 case DMA_FROM_DEVICE:
442 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
443 break;
444 case DMA_BIDIRECTIONAL:
445 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
446 case DMA_TO_DEVICE:
447 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
448 case DMA_NONE:
449 break;
450 }
451
452 if (!devinfo->use_streams) {
453 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB |
454 ALLOC_STATUS_URB | SUBMIT_STATUS_URB);
455 cmdinfo->stream = 0;
456 }
457
458 err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
459 if (err) {
460 /* If we did nothing, give up now */
461 if (cmdinfo->state & SUBMIT_STATUS_URB) {
462 usb_free_urb(cmdinfo->status_urb);
463 return SCSI_MLQUEUE_DEVICE_BUSY;
464 }
465 spin_lock(&uas_work_lock);
466 list_add_tail(&cmdinfo->list, &uas_work_list);
467 spin_unlock(&uas_work_lock);
468 schedule_work(&uas_work);
469 }
470
471 return 0;
472}
473
474static DEF_SCSI_QCMD(uas_queuecommand)
475
476static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
477{
478 struct scsi_device *sdev = cmnd->device;
479 sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
480 cmnd->request->tag);
481
482/* XXX: Send ABORT TASK Task Management command */
483 return FAILED;
484}
485
486static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
487{
488 struct scsi_device *sdev = cmnd->device;
489 sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
490 cmnd->request->tag);
491
492/* XXX: Send LOGICAL UNIT RESET Task Management command */
493 return FAILED;
494}
495
496static int uas_eh_target_reset_handler(struct scsi_cmnd *cmnd)
497{
498 struct scsi_device *sdev = cmnd->device;
499 sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
500 cmnd->request->tag);
501
502/* XXX: Can we reset just the one USB interface?
503 * Would calling usb_set_interface() have the right effect?
504 */
505 return FAILED;
506}
507
508static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
509{
510 struct scsi_device *sdev = cmnd->device;
511 struct uas_dev_info *devinfo = sdev->hostdata;
512 struct usb_device *udev = devinfo->udev;
513
514 sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
515 cmnd->request->tag);
516
517 if (usb_reset_device(udev))
518 return SUCCESS;
519
520 return FAILED;
521}
522
523static int uas_slave_alloc(struct scsi_device *sdev)
524{
525 sdev->hostdata = (void *)sdev->host->hostdata[0];
526 return 0;
527}
528
529static int uas_slave_configure(struct scsi_device *sdev)
530{
531 struct uas_dev_info *devinfo = sdev->hostdata;
532 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
533 scsi_activate_tcq(sdev, devinfo->qdepth - 2);
534 return 0;
535}
536
537static struct scsi_host_template uas_host_template = {
538 .module = THIS_MODULE,
539 .name = "uas",
540 .queuecommand = uas_queuecommand,
541 .slave_alloc = uas_slave_alloc,
542 .slave_configure = uas_slave_configure,
543 .eh_abort_handler = uas_eh_abort_handler,
544 .eh_device_reset_handler = uas_eh_device_reset_handler,
545 .eh_target_reset_handler = uas_eh_target_reset_handler,
546 .eh_bus_reset_handler = uas_eh_bus_reset_handler,
547 .can_queue = 65536, /* Is there a limit on the _host_ ? */
548 .this_id = -1,
549 .sg_tablesize = SG_NONE,
550 .cmd_per_lun = 1, /* until we override it */
551 .skip_settle_delay = 1,
552 .ordered_tag = 1,
553};
554
555static struct usb_device_id uas_usb_ids[] = {
556 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
557 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
558 /* 0xaa is a prototype device I happen to have access to */
559 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
560 { }
561};
562MODULE_DEVICE_TABLE(usb, uas_usb_ids);
563
564static int uas_is_interface(struct usb_host_interface *intf)
565{
566 return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE &&
567 intf->desc.bInterfaceSubClass == USB_SC_SCSI &&
568 intf->desc.bInterfaceProtocol == USB_PR_UAS);
569}
570
571static int uas_isnt_supported(struct usb_device *udev)
572{
573 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
574
575 dev_warn(&udev->dev, "The driver for the USB controller %s does not "
576 "support scatter-gather which is\n",
577 hcd->driver->description);
578 dev_warn(&udev->dev, "required by the UAS driver. Please try an"
579 "alternative USB controller if you wish to use UAS.\n");
580 return -ENODEV;
581}
582
583static int uas_switch_interface(struct usb_device *udev,
584 struct usb_interface *intf)
585{
586 int i;
587 int sg_supported = udev->bus->sg_tablesize != 0;
588
589 for (i = 0; i < intf->num_altsetting; i++) {
590 struct usb_host_interface *alt = &intf->altsetting[i];
591
592 if (uas_is_interface(alt)) {
593 if (!sg_supported)
594 return uas_isnt_supported(udev);
595 return usb_set_interface(udev,
596 alt->desc.bInterfaceNumber,
597 alt->desc.bAlternateSetting);
598 }
599 }
600
601 return -ENODEV;
602}
603
604static void uas_configure_endpoints(struct uas_dev_info *devinfo)
605{
606 struct usb_host_endpoint *eps[4] = { };
607 struct usb_interface *intf = devinfo->intf;
608 struct usb_device *udev = devinfo->udev;
609 struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;
610 unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints;
611
612 devinfo->uas_sense_old = 0;
613 devinfo->cmnd = NULL;
614
615 for (i = 0; i < n_endpoints; i++) {
616 unsigned char *extra = endpoint[i].extra;
617 int len = endpoint[i].extralen;
618 while (len > 1) {
619 if (extra[1] == USB_DT_PIPE_USAGE) {
620 unsigned pipe_id = extra[2];
621 if (pipe_id > 0 && pipe_id < 5)
622 eps[pipe_id - 1] = &endpoint[i];
623 break;
624 }
625 len -= extra[0];
626 extra += extra[0];
627 }
628 }
629
630 /*
631 * Assume that if we didn't find a control pipe descriptor, we're
632 * using a device with old firmware that happens to be set up like
633 * this.
634 */
635 if (!eps[0]) {
636 devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1);
637 devinfo->status_pipe = usb_rcvbulkpipe(udev, 1);
638 devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2);
639 devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2);
640
641 eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe);
642 eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
643 eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
644 } else {
645 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
646 eps[0]->desc.bEndpointAddress);
647 devinfo->status_pipe = usb_rcvbulkpipe(udev,
648 eps[1]->desc.bEndpointAddress);
649 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
650 eps[2]->desc.bEndpointAddress);
651 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
652 eps[3]->desc.bEndpointAddress);
653 }
654
655 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256,
656 GFP_KERNEL);
657 if (devinfo->qdepth < 0) {
658 devinfo->qdepth = 256;
659 devinfo->use_streams = 0;
660 } else {
661 devinfo->use_streams = 1;
662 }
663}
664
665static int uas_alloc_status_urb(struct uas_dev_info *devinfo,
666 struct Scsi_Host *shost)
667{
668 if (devinfo->use_streams) {
669 devinfo->status_urb = NULL;
670 return 0;
671 }
672
673 devinfo->status_urb = uas_alloc_sense_urb(devinfo, GFP_KERNEL,
674 shost, 0);
675 if (!devinfo->status_urb)
676 goto err_s_urb;
677
678 if (usb_submit_urb(devinfo->status_urb, GFP_KERNEL))
679 goto err_submit_urb;
680
681 return 0;
682err_submit_urb:
683 usb_free_urb(devinfo->status_urb);
684err_s_urb:
685 return -ENOMEM;
686}
687
688static void uas_free_streams(struct uas_dev_info *devinfo)
689{
690 struct usb_device *udev = devinfo->udev;
691 struct usb_host_endpoint *eps[3];
692
693 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
694 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
695 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
696 usb_free_streams(devinfo->intf, eps, 3, GFP_KERNEL);
697}
698
699/*
700 * XXX: What I'd like to do here is register a SCSI host for each USB host in
701 * the system. Follow usb-storage's design of registering a SCSI host for
702 * each USB device for the moment. Can implement this by walking up the
703 * USB hierarchy until we find a USB host.
704 */
705static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
706{
707 int result;
708 struct Scsi_Host *shost;
709 struct uas_dev_info *devinfo;
710 struct usb_device *udev = interface_to_usbdev(intf);
711
712 if (uas_switch_interface(udev, intf))
713 return -ENODEV;
714
715 devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL);
716 if (!devinfo)
717 return -ENOMEM;
718
719 result = -ENOMEM;
720 shost = scsi_host_alloc(&uas_host_template, sizeof(void *));
721 if (!shost)
722 goto free;
723
724 shost->max_cmd_len = 16 + 252;
725 shost->max_id = 1;
726 shost->sg_tablesize = udev->bus->sg_tablesize;
727
728 devinfo->intf = intf;
729 devinfo->udev = udev;
730 uas_configure_endpoints(devinfo);
731
732 result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
733 if (result)
734 goto free;
735
736 result = scsi_add_host(shost, &intf->dev);
737 if (result)
738 goto deconfig_eps;
739
740 shost->hostdata[0] = (unsigned long)devinfo;
741
742 result = uas_alloc_status_urb(devinfo, shost);
743 if (result)
744 goto err_alloc_status;
745
746 scsi_scan_host(shost);
747 usb_set_intfdata(intf, shost);
748 return result;
749
750err_alloc_status:
751 scsi_remove_host(shost);
752 shost = NULL;
753deconfig_eps:
754 uas_free_streams(devinfo);
755 free:
756 kfree(devinfo);
757 if (shost)
758 scsi_host_put(shost);
759 return result;
760}
761
762static int uas_pre_reset(struct usb_interface *intf)
763{
764/* XXX: Need to return 1 if it's not our device in error handling */
765 return 0;
766}
767
768static int uas_post_reset(struct usb_interface *intf)
769{
770/* XXX: Need to return 1 if it's not our device in error handling */
771 return 0;
772}
773
774static void uas_disconnect(struct usb_interface *intf)
775{
776 struct Scsi_Host *shost = usb_get_intfdata(intf);
777 struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
778
779 scsi_remove_host(shost);
780 usb_kill_urb(devinfo->status_urb);
781 usb_free_urb(devinfo->status_urb);
782 uas_free_streams(devinfo);
783 kfree(devinfo);
784}
785
786/*
787 * XXX: Should this plug into libusual so we can auto-upgrade devices from
788 * Bulk-Only to UAS?
789 */
790static struct usb_driver uas_driver = {
791 .name = "uas",
792 .probe = uas_probe,
793 .disconnect = uas_disconnect,
794 .pre_reset = uas_pre_reset,
795 .post_reset = uas_post_reset,
796 .id_table = uas_usb_ids,
797};
798
799module_usb_driver(uas_driver);
800
801MODULE_LICENSE("GPL");
802MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp");