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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/usb.h>
15#include <linux/usb/storage.h>
16
17#include <scsi/scsi.h>
18#include <scsi/scsi_dbg.h>
19#include <scsi/scsi_cmnd.h>
20#include <scsi/scsi_device.h>
21#include <scsi/scsi_host.h>
22#include <scsi/scsi_tcq.h>
23
24/* Common header for all IUs */
25struct iu {
26 __u8 iu_id;
27 __u8 rsvd1;
28 __be16 tag;
29};
30
31enum {
32 IU_ID_COMMAND = 0x01,
33 IU_ID_STATUS = 0x03,
34 IU_ID_RESPONSE = 0x04,
35 IU_ID_TASK_MGMT = 0x05,
36 IU_ID_READ_READY = 0x06,
37 IU_ID_WRITE_READY = 0x07,
38};
39
40struct command_iu {
41 __u8 iu_id;
42 __u8 rsvd1;
43 __be16 tag;
44 __u8 prio_attr;
45 __u8 rsvd5;
46 __u8 len;
47 __u8 rsvd7;
48 struct scsi_lun lun;
49 __u8 cdb[16]; /* XXX: Overflow-checking tools may misunderstand */
50};
51
52/*
53 * Also used for the Read Ready and Write Ready IUs since they have the
54 * same first four bytes
55 */
56struct sense_iu {
57 __u8 iu_id;
58 __u8 rsvd1;
59 __be16 tag;
60 __be16 status_qual;
61 __u8 status;
62 __u8 rsvd7[7];
63 __be16 len;
64 __u8 sense[SCSI_SENSE_BUFFERSIZE];
65};
66
67/*
68 * The r00-r01c specs define this version of the SENSE IU data structure.
69 * It's still in use by several different firmware releases.
70 */
71struct sense_iu_old {
72 __u8 iu_id;
73 __u8 rsvd1;
74 __be16 tag;
75 __be16 len;
76 __u8 status;
77 __u8 service_response;
78 __u8 sense[SCSI_SENSE_BUFFERSIZE];
79};
80
81enum {
82 CMD_PIPE_ID = 1,
83 STATUS_PIPE_ID = 2,
84 DATA_IN_PIPE_ID = 3,
85 DATA_OUT_PIPE_ID = 4,
86
87 UAS_SIMPLE_TAG = 0,
88 UAS_HEAD_TAG = 1,
89 UAS_ORDERED_TAG = 2,
90 UAS_ACA = 4,
91};
92
93struct uas_dev_info {
94 struct usb_interface *intf;
95 struct usb_device *udev;
96 int qdepth;
97 unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
98 unsigned use_streams:1;
99 unsigned uas_sense_old:1;
100};
101
102enum {
103 ALLOC_STATUS_URB = (1 << 0),
104 SUBMIT_STATUS_URB = (1 << 1),
105 ALLOC_DATA_IN_URB = (1 << 2),
106 SUBMIT_DATA_IN_URB = (1 << 3),
107 ALLOC_DATA_OUT_URB = (1 << 4),
108 SUBMIT_DATA_OUT_URB = (1 << 5),
109 ALLOC_CMD_URB = (1 << 6),
110 SUBMIT_CMD_URB = (1 << 7),
111};
112
113/* Overrides scsi_pointer */
114struct uas_cmd_info {
115 unsigned int state;
116 unsigned int stream;
117 struct urb *cmd_urb;
118 struct urb *status_urb;
119 struct urb *data_in_urb;
120 struct urb *data_out_urb;
121 struct list_head list;
122};
123
124/* I hate forward declarations, but I actually have a loop */
125static int uas_submit_urbs(struct scsi_cmnd *cmnd,
126 struct uas_dev_info *devinfo, gfp_t gfp);
127
128static DEFINE_SPINLOCK(uas_work_lock);
129static LIST_HEAD(uas_work_list);
130
131static void uas_do_work(struct work_struct *work)
132{
133 struct uas_cmd_info *cmdinfo;
134 struct list_head list;
135
136 spin_lock_irq(&uas_work_lock);
137 list_replace_init(&uas_work_list, &list);
138 spin_unlock_irq(&uas_work_lock);
139
140 list_for_each_entry(cmdinfo, &list, list) {
141 struct scsi_pointer *scp = (void *)cmdinfo;
142 struct scsi_cmnd *cmnd = container_of(scp,
143 struct scsi_cmnd, SCp);
144 uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_NOIO);
145 }
146}
147
148static DECLARE_WORK(uas_work, uas_do_work);
149
150static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
151{
152 struct sense_iu *sense_iu = urb->transfer_buffer;
153 struct scsi_device *sdev = cmnd->device;
154
155 if (urb->actual_length > 16) {
156 unsigned len = be16_to_cpup(&sense_iu->len);
157 if (len + 16 != urb->actual_length) {
158 int newlen = min(len + 16, urb->actual_length) - 16;
159 if (newlen < 0)
160 newlen = 0;
161 sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
162 "disagrees with IU sense data length %d, "
163 "using %d bytes of sense data\n", __func__,
164 urb->actual_length, len, newlen);
165 len = newlen;
166 }
167 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
168 }
169
170 cmnd->result = sense_iu->status;
171 if (sdev->current_cmnd)
172 sdev->current_cmnd = NULL;
173 cmnd->scsi_done(cmnd);
174 usb_free_urb(urb);
175}
176
177static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
178{
179 struct sense_iu_old *sense_iu = urb->transfer_buffer;
180 struct scsi_device *sdev = cmnd->device;
181
182 if (urb->actual_length > 8) {
183 unsigned len = be16_to_cpup(&sense_iu->len) - 2;
184 if (len + 8 != urb->actual_length) {
185 int newlen = min(len + 8, urb->actual_length) - 8;
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 if (sdev->current_cmnd)
199 sdev->current_cmnd = NULL;
200 cmnd->scsi_done(cmnd);
201 usb_free_urb(urb);
202}
203
204static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
205 unsigned direction)
206{
207 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
208 int err;
209
210 cmdinfo->state = direction | SUBMIT_STATUS_URB;
211 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
212 if (err) {
213 spin_lock(&uas_work_lock);
214 list_add_tail(&cmdinfo->list, &uas_work_list);
215 spin_unlock(&uas_work_lock);
216 schedule_work(&uas_work);
217 }
218}
219
220static void uas_stat_cmplt(struct urb *urb)
221{
222 struct iu *iu = urb->transfer_buffer;
223 struct scsi_device *sdev = urb->context;
224 struct uas_dev_info *devinfo = sdev->hostdata;
225 struct scsi_cmnd *cmnd;
226 u16 tag;
227
228 if (urb->status) {
229 dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status);
230 usb_free_urb(urb);
231 return;
232 }
233
234 tag = be16_to_cpup(&iu->tag) - 1;
235 if (sdev->current_cmnd)
236 cmnd = sdev->current_cmnd;
237 else
238 cmnd = scsi_find_tag(sdev, tag);
239 if (!cmnd)
240 return;
241
242 switch (iu->iu_id) {
243 case IU_ID_STATUS:
244 if (urb->actual_length < 16)
245 devinfo->uas_sense_old = 1;
246 if (devinfo->uas_sense_old)
247 uas_sense_old(urb, cmnd);
248 else
249 uas_sense(urb, cmnd);
250 break;
251 case IU_ID_READ_READY:
252 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
253 break;
254 case IU_ID_WRITE_READY:
255 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
256 break;
257 default:
258 scmd_printk(KERN_ERR, cmnd,
259 "Bogus IU (%d) received on status pipe\n", iu->iu_id);
260 }
261}
262
263static void uas_data_cmplt(struct urb *urb)
264{
265 struct scsi_data_buffer *sdb = urb->context;
266 sdb->resid = sdb->length - urb->actual_length;
267 usb_free_urb(urb);
268}
269
270static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
271 unsigned int pipe, u16 stream_id,
272 struct scsi_data_buffer *sdb,
273 enum dma_data_direction dir)
274{
275 struct usb_device *udev = devinfo->udev;
276 struct urb *urb = usb_alloc_urb(0, gfp);
277
278 if (!urb)
279 goto out;
280 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, uas_data_cmplt,
281 sdb);
282 if (devinfo->use_streams)
283 urb->stream_id = stream_id;
284 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
285 urb->sg = sdb->table.sgl;
286 out:
287 return urb;
288}
289
290static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
291 struct scsi_cmnd *cmnd, u16 stream_id)
292{
293 struct usb_device *udev = devinfo->udev;
294 struct urb *urb = usb_alloc_urb(0, gfp);
295 struct sense_iu *iu;
296
297 if (!urb)
298 goto out;
299
300 iu = kzalloc(sizeof(*iu), gfp);
301 if (!iu)
302 goto free;
303
304 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
305 uas_stat_cmplt, cmnd->device);
306 urb->stream_id = stream_id;
307 urb->transfer_flags |= URB_FREE_BUFFER;
308 out:
309 return urb;
310 free:
311 usb_free_urb(urb);
312 return NULL;
313}
314
315static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
316 struct scsi_cmnd *cmnd, u16 stream_id)
317{
318 struct usb_device *udev = devinfo->udev;
319 struct scsi_device *sdev = cmnd->device;
320 struct urb *urb = usb_alloc_urb(0, gfp);
321 struct command_iu *iu;
322 int len;
323
324 if (!urb)
325 goto out;
326
327 len = cmnd->cmd_len - 16;
328 if (len < 0)
329 len = 0;
330 len = ALIGN(len, 4);
331 iu = kzalloc(sizeof(*iu) + len, gfp);
332 if (!iu)
333 goto free;
334
335 iu->iu_id = IU_ID_COMMAND;
336 iu->tag = cpu_to_be16(stream_id);
337 iu->prio_attr = UAS_SIMPLE_TAG;
338 iu->len = len;
339 int_to_scsilun(sdev->lun, &iu->lun);
340 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
341
342 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
343 usb_free_urb, NULL);
344 urb->transfer_flags |= URB_FREE_BUFFER;
345 out:
346 return urb;
347 free:
348 usb_free_urb(urb);
349 return NULL;
350}
351
352/*
353 * Why should I request the Status IU before sending the Command IU? Spec
354 * says to, but also says the device may receive them in any order. Seems
355 * daft to me.
356 */
357
358static int uas_submit_urbs(struct scsi_cmnd *cmnd,
359 struct uas_dev_info *devinfo, gfp_t gfp)
360{
361 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
362
363 if (cmdinfo->state & ALLOC_STATUS_URB) {
364 cmdinfo->status_urb = uas_alloc_sense_urb(devinfo, gfp, cmnd,
365 cmdinfo->stream);
366 if (!cmdinfo->status_urb)
367 return SCSI_MLQUEUE_DEVICE_BUSY;
368 cmdinfo->state &= ~ALLOC_STATUS_URB;
369 }
370
371 if (cmdinfo->state & SUBMIT_STATUS_URB) {
372 if (usb_submit_urb(cmdinfo->status_urb, gfp)) {
373 scmd_printk(KERN_INFO, cmnd,
374 "sense urb submission failure\n");
375 return SCSI_MLQUEUE_DEVICE_BUSY;
376 }
377 cmdinfo->state &= ~SUBMIT_STATUS_URB;
378 }
379
380 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
381 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
382 devinfo->data_in_pipe, cmdinfo->stream,
383 scsi_in(cmnd), DMA_FROM_DEVICE);
384 if (!cmdinfo->data_in_urb)
385 return SCSI_MLQUEUE_DEVICE_BUSY;
386 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
387 }
388
389 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
390 if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
391 scmd_printk(KERN_INFO, cmnd,
392 "data in urb submission failure\n");
393 return SCSI_MLQUEUE_DEVICE_BUSY;
394 }
395 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
396 }
397
398 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
399 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
400 devinfo->data_out_pipe, cmdinfo->stream,
401 scsi_out(cmnd), DMA_TO_DEVICE);
402 if (!cmdinfo->data_out_urb)
403 return SCSI_MLQUEUE_DEVICE_BUSY;
404 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
405 }
406
407 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
408 if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
409 scmd_printk(KERN_INFO, cmnd,
410 "data out urb submission failure\n");
411 return SCSI_MLQUEUE_DEVICE_BUSY;
412 }
413 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
414 }
415
416 if (cmdinfo->state & ALLOC_CMD_URB) {
417 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd,
418 cmdinfo->stream);
419 if (!cmdinfo->cmd_urb)
420 return SCSI_MLQUEUE_DEVICE_BUSY;
421 cmdinfo->state &= ~ALLOC_CMD_URB;
422 }
423
424 if (cmdinfo->state & SUBMIT_CMD_URB) {
425 if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
426 scmd_printk(KERN_INFO, cmnd,
427 "cmd urb submission failure\n");
428 return SCSI_MLQUEUE_DEVICE_BUSY;
429 }
430 cmdinfo->state &= ~SUBMIT_CMD_URB;
431 }
432
433 return 0;
434}
435
436static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
437 void (*done)(struct scsi_cmnd *))
438{
439 struct scsi_device *sdev = cmnd->device;
440 struct uas_dev_info *devinfo = sdev->hostdata;
441 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
442 int err;
443
444 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
445
446 if (!cmdinfo->status_urb && sdev->current_cmnd)
447 return SCSI_MLQUEUE_DEVICE_BUSY;
448
449 if (blk_rq_tagged(cmnd->request)) {
450 cmdinfo->stream = cmnd->request->tag + 1;
451 } else {
452 sdev->current_cmnd = cmnd;
453 cmdinfo->stream = 1;
454 }
455
456 cmnd->scsi_done = done;
457
458 cmdinfo->state = ALLOC_STATUS_URB | SUBMIT_STATUS_URB |
459 ALLOC_CMD_URB | SUBMIT_CMD_URB;
460
461 switch (cmnd->sc_data_direction) {
462 case DMA_FROM_DEVICE:
463 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
464 break;
465 case DMA_BIDIRECTIONAL:
466 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
467 case DMA_TO_DEVICE:
468 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
469 case DMA_NONE:
470 break;
471 }
472
473 if (!devinfo->use_streams) {
474 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
475 cmdinfo->stream = 0;
476 }
477
478 err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
479 if (err) {
480 /* If we did nothing, give up now */
481 if (cmdinfo->state & SUBMIT_STATUS_URB) {
482 usb_free_urb(cmdinfo->status_urb);
483 return SCSI_MLQUEUE_DEVICE_BUSY;
484 }
485 spin_lock(&uas_work_lock);
486 list_add_tail(&cmdinfo->list, &uas_work_list);
487 spin_unlock(&uas_work_lock);
488 schedule_work(&uas_work);
489 }
490
491 return 0;
492}
493
494static DEF_SCSI_QCMD(uas_queuecommand)
495
496static int uas_eh_abort_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: Send ABORT TASK Task Management command */
503 return FAILED;
504}
505
506static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
507{
508 struct scsi_device *sdev = cmnd->device;
509 sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
510 cmnd->request->tag);
511
512/* XXX: Send LOGICAL UNIT RESET Task Management command */
513 return FAILED;
514}
515
516static int uas_eh_target_reset_handler(struct scsi_cmnd *cmnd)
517{
518 struct scsi_device *sdev = cmnd->device;
519 sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
520 cmnd->request->tag);
521
522/* XXX: Can we reset just the one USB interface?
523 * Would calling usb_set_interface() have the right effect?
524 */
525 return FAILED;
526}
527
528static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
529{
530 struct scsi_device *sdev = cmnd->device;
531 struct uas_dev_info *devinfo = sdev->hostdata;
532 struct usb_device *udev = devinfo->udev;
533
534 sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
535 cmnd->request->tag);
536
537 if (usb_reset_device(udev))
538 return SUCCESS;
539
540 return FAILED;
541}
542
543static int uas_slave_alloc(struct scsi_device *sdev)
544{
545 sdev->hostdata = (void *)sdev->host->hostdata[0];
546 return 0;
547}
548
549static int uas_slave_configure(struct scsi_device *sdev)
550{
551 struct uas_dev_info *devinfo = sdev->hostdata;
552 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
553 scsi_activate_tcq(sdev, devinfo->qdepth - 1);
554 return 0;
555}
556
557static struct scsi_host_template uas_host_template = {
558 .module = THIS_MODULE,
559 .name = "uas",
560 .queuecommand = uas_queuecommand,
561 .slave_alloc = uas_slave_alloc,
562 .slave_configure = uas_slave_configure,
563 .eh_abort_handler = uas_eh_abort_handler,
564 .eh_device_reset_handler = uas_eh_device_reset_handler,
565 .eh_target_reset_handler = uas_eh_target_reset_handler,
566 .eh_bus_reset_handler = uas_eh_bus_reset_handler,
567 .can_queue = 65536, /* Is there a limit on the _host_ ? */
568 .this_id = -1,
569 .sg_tablesize = SG_NONE,
570 .cmd_per_lun = 1, /* until we override it */
571 .skip_settle_delay = 1,
572 .ordered_tag = 1,
573};
574
575static struct usb_device_id uas_usb_ids[] = {
576 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
577 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
578 /* 0xaa is a prototype device I happen to have access to */
579 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
580 { }
581};
582MODULE_DEVICE_TABLE(usb, uas_usb_ids);
583
584static int uas_is_interface(struct usb_host_interface *intf)
585{
586 return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE &&
587 intf->desc.bInterfaceSubClass == USB_SC_SCSI &&
588 intf->desc.bInterfaceProtocol == USB_PR_UAS);
589}
590
591static int uas_switch_interface(struct usb_device *udev,
592 struct usb_interface *intf)
593{
594 int i;
595
596 if (uas_is_interface(intf->cur_altsetting))
597 return 0;
598
599 for (i = 0; i < intf->num_altsetting; i++) {
600 struct usb_host_interface *alt = &intf->altsetting[i];
601 if (alt == intf->cur_altsetting)
602 continue;
603 if (uas_is_interface(alt))
604 return usb_set_interface(udev,
605 alt->desc.bInterfaceNumber,
606 alt->desc.bAlternateSetting);
607 }
608
609 return -ENODEV;
610}
611
612static void uas_configure_endpoints(struct uas_dev_info *devinfo)
613{
614 struct usb_host_endpoint *eps[4] = { };
615 struct usb_interface *intf = devinfo->intf;
616 struct usb_device *udev = devinfo->udev;
617 struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;
618 unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints;
619
620 devinfo->uas_sense_old = 0;
621
622 for (i = 0; i < n_endpoints; i++) {
623 unsigned char *extra = endpoint[i].extra;
624 int len = endpoint[i].extralen;
625 while (len > 1) {
626 if (extra[1] == USB_DT_PIPE_USAGE) {
627 unsigned pipe_id = extra[2];
628 if (pipe_id > 0 && pipe_id < 5)
629 eps[pipe_id - 1] = &endpoint[i];
630 break;
631 }
632 len -= extra[0];
633 extra += extra[0];
634 }
635 }
636
637 /*
638 * Assume that if we didn't find a control pipe descriptor, we're
639 * using a device with old firmware that happens to be set up like
640 * this.
641 */
642 if (!eps[0]) {
643 devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1);
644 devinfo->status_pipe = usb_rcvbulkpipe(udev, 1);
645 devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2);
646 devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2);
647
648 eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe);
649 eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
650 eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
651 } else {
652 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
653 eps[0]->desc.bEndpointAddress);
654 devinfo->status_pipe = usb_rcvbulkpipe(udev,
655 eps[1]->desc.bEndpointAddress);
656 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
657 eps[2]->desc.bEndpointAddress);
658 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
659 eps[3]->desc.bEndpointAddress);
660 }
661
662 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256,
663 GFP_KERNEL);
664 if (devinfo->qdepth < 0) {
665 devinfo->qdepth = 256;
666 devinfo->use_streams = 0;
667 } else {
668 devinfo->use_streams = 1;
669 }
670}
671
672/*
673 * XXX: What I'd like to do here is register a SCSI host for each USB host in
674 * the system. Follow usb-storage's design of registering a SCSI host for
675 * each USB device for the moment. Can implement this by walking up the
676 * USB hierarchy until we find a USB host.
677 */
678static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
679{
680 int result;
681 struct Scsi_Host *shost;
682 struct uas_dev_info *devinfo;
683 struct usb_device *udev = interface_to_usbdev(intf);
684
685 if (uas_switch_interface(udev, intf))
686 return -ENODEV;
687
688 devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL);
689 if (!devinfo)
690 return -ENOMEM;
691
692 result = -ENOMEM;
693 shost = scsi_host_alloc(&uas_host_template, sizeof(void *));
694 if (!shost)
695 goto free;
696
697 shost->max_cmd_len = 16 + 252;
698 shost->max_id = 1;
699 shost->sg_tablesize = udev->bus->sg_tablesize;
700
701 result = scsi_add_host(shost, &intf->dev);
702 if (result)
703 goto free;
704 shost->hostdata[0] = (unsigned long)devinfo;
705
706 devinfo->intf = intf;
707 devinfo->udev = udev;
708 uas_configure_endpoints(devinfo);
709
710 scsi_scan_host(shost);
711 usb_set_intfdata(intf, shost);
712 return result;
713 free:
714 kfree(devinfo);
715 if (shost)
716 scsi_host_put(shost);
717 return result;
718}
719
720static int uas_pre_reset(struct usb_interface *intf)
721{
722/* XXX: Need to return 1 if it's not our device in error handling */
723 return 0;
724}
725
726static int uas_post_reset(struct usb_interface *intf)
727{
728/* XXX: Need to return 1 if it's not our device in error handling */
729 return 0;
730}
731
732static void uas_disconnect(struct usb_interface *intf)
733{
734 struct usb_device *udev = interface_to_usbdev(intf);
735 struct usb_host_endpoint *eps[3];
736 struct Scsi_Host *shost = usb_get_intfdata(intf);
737 struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
738
739 scsi_remove_host(shost);
740
741 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
742 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
743 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
744 usb_free_streams(intf, eps, 3, GFP_KERNEL);
745
746 kfree(devinfo);
747}
748
749/*
750 * XXX: Should this plug into libusual so we can auto-upgrade devices from
751 * Bulk-Only to UAS?
752 */
753static struct usb_driver uas_driver = {
754 .name = "uas",
755 .probe = uas_probe,
756 .disconnect = uas_disconnect,
757 .pre_reset = uas_pre_reset,
758 .post_reset = uas_post_reset,
759 .id_table = uas_usb_ids,
760};
761
762static int uas_init(void)
763{
764 return usb_register(&uas_driver);
765}
766
767static void uas_exit(void)
768{
769 usb_deregister(&uas_driver);
770}
771
772module_init(uas_init);
773module_exit(uas_exit);
774
775MODULE_LICENSE("GPL");
776MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * USB Attached SCSI
4 * Note that this is not the same as the USB Mass Storage driver
5 *
6 * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2016
7 * Copyright Matthew Wilcox for Intel Corp, 2010
8 * Copyright Sarah Sharp for Intel Corp, 2010
9 */
10
11#include <linux/blkdev.h>
12#include <linux/slab.h>
13#include <linux/types.h>
14#include <linux/module.h>
15#include <linux/usb.h>
16#include <linux/usb_usual.h>
17#include <linux/usb/hcd.h>
18#include <linux/usb/storage.h>
19#include <linux/usb/uas.h>
20
21#include <scsi/scsi.h>
22#include <scsi/scsi_eh.h>
23#include <scsi/scsi_dbg.h>
24#include <scsi/scsi_cmnd.h>
25#include <scsi/scsi_device.h>
26#include <scsi/scsi_host.h>
27#include <scsi/scsi_tcq.h>
28
29#include "uas-detect.h"
30#include "scsiglue.h"
31
32#define MAX_CMNDS 256
33
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};
49
50enum {
51 SUBMIT_STATUS_URB = BIT(1),
52 ALLOC_DATA_IN_URB = BIT(2),
53 SUBMIT_DATA_IN_URB = BIT(3),
54 ALLOC_DATA_OUT_URB = BIT(4),
55 SUBMIT_DATA_OUT_URB = BIT(5),
56 ALLOC_CMD_URB = BIT(6),
57 SUBMIT_CMD_URB = BIT(7),
58 COMMAND_INFLIGHT = BIT(8),
59 DATA_IN_URB_INFLIGHT = BIT(9),
60 DATA_OUT_URB_INFLIGHT = BIT(10),
61 COMMAND_ABORTED = BIT(11),
62 IS_IN_WORK_LIST = BIT(12),
63};
64
65/* Overrides scsi_pointer */
66struct uas_cmd_info {
67 unsigned int state;
68 unsigned int uas_tag;
69 struct urb *cmd_urb;
70 struct urb *data_in_urb;
71 struct urb *data_out_urb;
72};
73
74/* I hate forward declarations, but I actually have a loop */
75static int uas_submit_urbs(struct scsi_cmnd *cmnd,
76 struct uas_dev_info *devinfo);
77static void uas_do_work(struct work_struct *work);
78static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
79static void uas_free_streams(struct uas_dev_info *devinfo);
80static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
81 int status);
82
83static void uas_do_work(struct work_struct *work)
84{
85 struct uas_dev_info *devinfo =
86 container_of(work, struct uas_dev_info, work);
87 struct uas_cmd_info *cmdinfo;
88 struct scsi_cmnd *cmnd;
89 unsigned long flags;
90 int i, err;
91
92 spin_lock_irqsave(&devinfo->lock, flags);
93
94 if (devinfo->resetting)
95 goto out;
96
97 for (i = 0; i < devinfo->qdepth; i++) {
98 if (!devinfo->cmnd[i])
99 continue;
100
101 cmnd = devinfo->cmnd[i];
102 cmdinfo = (void *)&cmnd->SCp;
103
104 if (!(cmdinfo->state & IS_IN_WORK_LIST))
105 continue;
106
107 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
108 if (!err)
109 cmdinfo->state &= ~IS_IN_WORK_LIST;
110 else
111 schedule_work(&devinfo->work);
112 }
113out:
114 spin_unlock_irqrestore(&devinfo->lock, flags);
115}
116
117static void uas_add_work(struct uas_cmd_info *cmdinfo)
118{
119 struct scsi_pointer *scp = (void *)cmdinfo;
120 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
121 struct uas_dev_info *devinfo = cmnd->device->hostdata;
122
123 lockdep_assert_held(&devinfo->lock);
124 cmdinfo->state |= IS_IN_WORK_LIST;
125 schedule_work(&devinfo->work);
126}
127
128static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
129{
130 struct uas_cmd_info *cmdinfo;
131 struct scsi_cmnd *cmnd;
132 unsigned long flags;
133 int i, err;
134
135 spin_lock_irqsave(&devinfo->lock, flags);
136 for (i = 0; i < devinfo->qdepth; i++) {
137 if (!devinfo->cmnd[i])
138 continue;
139
140 cmnd = devinfo->cmnd[i];
141 cmdinfo = (void *)&cmnd->SCp;
142 uas_log_cmd_state(cmnd, __func__, 0);
143 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
144 cmdinfo->state &= ~COMMAND_INFLIGHT;
145 cmnd->result = result << 16;
146 err = uas_try_complete(cmnd, __func__);
147 WARN_ON(err != 0);
148 }
149 spin_unlock_irqrestore(&devinfo->lock, flags);
150}
151
152static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
153{
154 struct sense_iu *sense_iu = urb->transfer_buffer;
155 struct scsi_device *sdev = cmnd->device;
156
157 if (urb->actual_length > 16) {
158 unsigned len = be16_to_cpup(&sense_iu->len);
159 if (len + 16 != urb->actual_length) {
160 int newlen = min(len + 16, urb->actual_length) - 16;
161 if (newlen < 0)
162 newlen = 0;
163 sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
164 "disagrees with IU sense data length %d, "
165 "using %d bytes of sense data\n", __func__,
166 urb->actual_length, len, newlen);
167 len = newlen;
168 }
169 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
170 }
171
172 cmnd->result = sense_iu->status;
173}
174
175static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
176 int status)
177{
178 struct uas_cmd_info *ci = (void *)&cmnd->SCp;
179 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
180
181 scmd_printk(KERN_INFO, cmnd,
182 "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
183 prefix, status, cmdinfo->uas_tag,
184 (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
185 (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
186 (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "",
187 (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "",
188 (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "",
189 (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "",
190 (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "",
191 (ci->state & COMMAND_INFLIGHT) ? " CMD" : "",
192 (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
193 (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
194 (ci->state & COMMAND_ABORTED) ? " abort" : "",
195 (ci->state & IS_IN_WORK_LIST) ? " work" : "");
196 scsi_print_command(cmnd);
197}
198
199static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
200{
201 struct uas_cmd_info *cmdinfo;
202
203 if (!cmnd)
204 return;
205
206 cmdinfo = (void *)&cmnd->SCp;
207
208 if (cmdinfo->state & SUBMIT_CMD_URB)
209 usb_free_urb(cmdinfo->cmd_urb);
210
211 /* data urbs may have never gotten their submit flag set */
212 if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
213 usb_free_urb(cmdinfo->data_in_urb);
214 if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
215 usb_free_urb(cmdinfo->data_out_urb);
216}
217
218static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
219{
220 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
221 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
222
223 lockdep_assert_held(&devinfo->lock);
224 if (cmdinfo->state & (COMMAND_INFLIGHT |
225 DATA_IN_URB_INFLIGHT |
226 DATA_OUT_URB_INFLIGHT |
227 COMMAND_ABORTED))
228 return -EBUSY;
229 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
230 uas_free_unsubmitted_urbs(cmnd);
231 cmnd->scsi_done(cmnd);
232 return 0;
233}
234
235static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
236 unsigned direction)
237{
238 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
239 int err;
240
241 cmdinfo->state |= direction | SUBMIT_STATUS_URB;
242 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
243 if (err) {
244 uas_add_work(cmdinfo);
245 }
246}
247
248static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
249{
250 u8 response_code = riu->response_code;
251
252 switch (response_code) {
253 case RC_INCORRECT_LUN:
254 cmnd->result = DID_BAD_TARGET << 16;
255 break;
256 case RC_TMF_SUCCEEDED:
257 cmnd->result = DID_OK << 16;
258 break;
259 case RC_TMF_NOT_SUPPORTED:
260 cmnd->result = DID_TARGET_FAILURE << 16;
261 break;
262 default:
263 uas_log_cmd_state(cmnd, "response iu", response_code);
264 cmnd->result = DID_ERROR << 16;
265 break;
266 }
267
268 return response_code == RC_TMF_SUCCEEDED;
269}
270
271static void uas_stat_cmplt(struct urb *urb)
272{
273 struct iu *iu = urb->transfer_buffer;
274 struct Scsi_Host *shost = urb->context;
275 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
276 struct urb *data_in_urb = NULL;
277 struct urb *data_out_urb = NULL;
278 struct scsi_cmnd *cmnd;
279 struct uas_cmd_info *cmdinfo;
280 unsigned long flags;
281 unsigned int idx;
282 int status = urb->status;
283 bool success;
284
285 spin_lock_irqsave(&devinfo->lock, flags);
286
287 if (devinfo->resetting)
288 goto out;
289
290 if (status) {
291 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
292 dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
293 goto out;
294 }
295
296 idx = be16_to_cpup(&iu->tag) - 1;
297 if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
298 dev_err(&urb->dev->dev,
299 "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
300 goto out;
301 }
302
303 cmnd = devinfo->cmnd[idx];
304 cmdinfo = (void *)&cmnd->SCp;
305
306 if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
307 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
308 goto out;
309 }
310
311 switch (iu->iu_id) {
312 case IU_ID_STATUS:
313 uas_sense(urb, cmnd);
314 if (cmnd->result != 0) {
315 /* cancel data transfers on error */
316 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
317 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
318 }
319 cmdinfo->state &= ~COMMAND_INFLIGHT;
320 uas_try_complete(cmnd, __func__);
321 break;
322 case IU_ID_READ_READY:
323 if (!cmdinfo->data_in_urb ||
324 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
325 uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
326 break;
327 }
328 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
329 break;
330 case IU_ID_WRITE_READY:
331 if (!cmdinfo->data_out_urb ||
332 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
333 uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
334 break;
335 }
336 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
337 break;
338 case IU_ID_RESPONSE:
339 cmdinfo->state &= ~COMMAND_INFLIGHT;
340 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
341 if (!success) {
342 /* Error, cancel data transfers */
343 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
344 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
345 }
346 uas_try_complete(cmnd, __func__);
347 break;
348 default:
349 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
350 }
351out:
352 usb_free_urb(urb);
353 spin_unlock_irqrestore(&devinfo->lock, flags);
354
355 /* Unlinking of data urbs must be done without holding the lock */
356 if (data_in_urb) {
357 usb_unlink_urb(data_in_urb);
358 usb_put_urb(data_in_urb);
359 }
360 if (data_out_urb) {
361 usb_unlink_urb(data_out_urb);
362 usb_put_urb(data_out_urb);
363 }
364}
365
366static void uas_data_cmplt(struct urb *urb)
367{
368 struct scsi_cmnd *cmnd = urb->context;
369 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
370 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
371 struct scsi_data_buffer *sdb = NULL;
372 unsigned long flags;
373 int status = urb->status;
374
375 spin_lock_irqsave(&devinfo->lock, flags);
376
377 if (cmdinfo->data_in_urb == urb) {
378 sdb = scsi_in(cmnd);
379 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
380 cmdinfo->data_in_urb = NULL;
381 } else if (cmdinfo->data_out_urb == urb) {
382 sdb = scsi_out(cmnd);
383 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
384 cmdinfo->data_out_urb = NULL;
385 }
386 if (sdb == NULL) {
387 WARN_ON_ONCE(1);
388 goto out;
389 }
390
391 if (devinfo->resetting)
392 goto out;
393
394 /* Data urbs should not complete before the cmd urb is submitted */
395 if (cmdinfo->state & SUBMIT_CMD_URB) {
396 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
397 goto out;
398 }
399
400 if (status) {
401 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
402 uas_log_cmd_state(cmnd, "data cmplt err", status);
403 /* error: no data transfered */
404 sdb->resid = sdb->length;
405 } else {
406 sdb->resid = sdb->length - urb->actual_length;
407 }
408 uas_try_complete(cmnd, __func__);
409out:
410 usb_free_urb(urb);
411 spin_unlock_irqrestore(&devinfo->lock, flags);
412}
413
414static void uas_cmd_cmplt(struct urb *urb)
415{
416 if (urb->status)
417 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
418
419 usb_free_urb(urb);
420}
421
422static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
423 struct scsi_cmnd *cmnd,
424 enum dma_data_direction dir)
425{
426 struct usb_device *udev = devinfo->udev;
427 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
428 struct urb *urb = usb_alloc_urb(0, gfp);
429 struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
430 ? scsi_in(cmnd) : scsi_out(cmnd);
431 unsigned int pipe = (dir == DMA_FROM_DEVICE)
432 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
433
434 if (!urb)
435 goto out;
436 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
437 uas_data_cmplt, cmnd);
438 if (devinfo->use_streams)
439 urb->stream_id = cmdinfo->uas_tag;
440 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
441 urb->sg = sdb->table.sgl;
442 out:
443 return urb;
444}
445
446static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
447 struct scsi_cmnd *cmnd)
448{
449 struct usb_device *udev = devinfo->udev;
450 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
451 struct urb *urb = usb_alloc_urb(0, gfp);
452 struct sense_iu *iu;
453
454 if (!urb)
455 goto out;
456
457 iu = kzalloc(sizeof(*iu), gfp);
458 if (!iu)
459 goto free;
460
461 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
462 uas_stat_cmplt, cmnd->device->host);
463 if (devinfo->use_streams)
464 urb->stream_id = cmdinfo->uas_tag;
465 urb->transfer_flags |= URB_FREE_BUFFER;
466 out:
467 return urb;
468 free:
469 usb_free_urb(urb);
470 return NULL;
471}
472
473static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
474 struct scsi_cmnd *cmnd)
475{
476 struct usb_device *udev = devinfo->udev;
477 struct scsi_device *sdev = cmnd->device;
478 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
479 struct urb *urb = usb_alloc_urb(0, gfp);
480 struct command_iu *iu;
481 int len;
482
483 if (!urb)
484 goto out;
485
486 len = cmnd->cmd_len - 16;
487 if (len < 0)
488 len = 0;
489 len = ALIGN(len, 4);
490 iu = kzalloc(sizeof(*iu) + len, gfp);
491 if (!iu)
492 goto free;
493
494 iu->iu_id = IU_ID_COMMAND;
495 iu->tag = cpu_to_be16(cmdinfo->uas_tag);
496 iu->prio_attr = UAS_SIMPLE_TAG;
497 iu->len = len;
498 int_to_scsilun(sdev->lun, &iu->lun);
499 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
500
501 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
502 uas_cmd_cmplt, NULL);
503 urb->transfer_flags |= URB_FREE_BUFFER;
504 out:
505 return urb;
506 free:
507 usb_free_urb(urb);
508 return NULL;
509}
510
511/*
512 * Why should I request the Status IU before sending the Command IU? Spec
513 * says to, but also says the device may receive them in any order. Seems
514 * daft to me.
515 */
516
517static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
518{
519 struct uas_dev_info *devinfo = cmnd->device->hostdata;
520 struct urb *urb;
521 int err;
522
523 urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
524 if (!urb)
525 return NULL;
526 usb_anchor_urb(urb, &devinfo->sense_urbs);
527 err = usb_submit_urb(urb, gfp);
528 if (err) {
529 usb_unanchor_urb(urb);
530 uas_log_cmd_state(cmnd, "sense submit err", err);
531 usb_free_urb(urb);
532 return NULL;
533 }
534 return urb;
535}
536
537static int uas_submit_urbs(struct scsi_cmnd *cmnd,
538 struct uas_dev_info *devinfo)
539{
540 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
541 struct urb *urb;
542 int err;
543
544 lockdep_assert_held(&devinfo->lock);
545 if (cmdinfo->state & SUBMIT_STATUS_URB) {
546 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
547 if (!urb)
548 return SCSI_MLQUEUE_DEVICE_BUSY;
549 cmdinfo->state &= ~SUBMIT_STATUS_URB;
550 }
551
552 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
553 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
554 cmnd, DMA_FROM_DEVICE);
555 if (!cmdinfo->data_in_urb)
556 return SCSI_MLQUEUE_DEVICE_BUSY;
557 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
558 }
559
560 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
561 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
562 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
563 if (err) {
564 usb_unanchor_urb(cmdinfo->data_in_urb);
565 uas_log_cmd_state(cmnd, "data in submit err", err);
566 return SCSI_MLQUEUE_DEVICE_BUSY;
567 }
568 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
569 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
570 }
571
572 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
573 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
574 cmnd, DMA_TO_DEVICE);
575 if (!cmdinfo->data_out_urb)
576 return SCSI_MLQUEUE_DEVICE_BUSY;
577 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
578 }
579
580 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
581 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
582 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
583 if (err) {
584 usb_unanchor_urb(cmdinfo->data_out_urb);
585 uas_log_cmd_state(cmnd, "data out submit err", err);
586 return SCSI_MLQUEUE_DEVICE_BUSY;
587 }
588 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
589 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
590 }
591
592 if (cmdinfo->state & ALLOC_CMD_URB) {
593 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
594 if (!cmdinfo->cmd_urb)
595 return SCSI_MLQUEUE_DEVICE_BUSY;
596 cmdinfo->state &= ~ALLOC_CMD_URB;
597 }
598
599 if (cmdinfo->state & SUBMIT_CMD_URB) {
600 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
601 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
602 if (err) {
603 usb_unanchor_urb(cmdinfo->cmd_urb);
604 uas_log_cmd_state(cmnd, "cmd submit err", err);
605 return SCSI_MLQUEUE_DEVICE_BUSY;
606 }
607 cmdinfo->cmd_urb = NULL;
608 cmdinfo->state &= ~SUBMIT_CMD_URB;
609 cmdinfo->state |= COMMAND_INFLIGHT;
610 }
611
612 return 0;
613}
614
615static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
616 void (*done)(struct scsi_cmnd *))
617{
618 struct scsi_device *sdev = cmnd->device;
619 struct uas_dev_info *devinfo = sdev->hostdata;
620 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
621 unsigned long flags;
622 int idx, err;
623
624 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
625
626 /* Re-check scsi_block_requests now that we've the host-lock */
627 if (cmnd->device->host->host_self_blocked)
628 return SCSI_MLQUEUE_DEVICE_BUSY;
629
630 if ((devinfo->flags & US_FL_NO_ATA_1X) &&
631 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
632 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
633 sizeof(usb_stor_sense_invalidCDB));
634 cmnd->result = SAM_STAT_CHECK_CONDITION;
635 cmnd->scsi_done(cmnd);
636 return 0;
637 }
638
639 spin_lock_irqsave(&devinfo->lock, flags);
640
641 if (devinfo->resetting) {
642 cmnd->result = DID_ERROR << 16;
643 cmnd->scsi_done(cmnd);
644 spin_unlock_irqrestore(&devinfo->lock, flags);
645 return 0;
646 }
647
648 /* Find a free uas-tag */
649 for (idx = 0; idx < devinfo->qdepth; idx++) {
650 if (!devinfo->cmnd[idx])
651 break;
652 }
653 if (idx == devinfo->qdepth) {
654 spin_unlock_irqrestore(&devinfo->lock, flags);
655 return SCSI_MLQUEUE_DEVICE_BUSY;
656 }
657
658 cmnd->scsi_done = done;
659
660 memset(cmdinfo, 0, sizeof(*cmdinfo));
661 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
662 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
663
664 switch (cmnd->sc_data_direction) {
665 case DMA_FROM_DEVICE:
666 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
667 break;
668 case DMA_BIDIRECTIONAL:
669 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
670 /* fall through */
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_device_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 /*
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
828static 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
843static 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_device_reset_handler = uas_eh_device_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
863static 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};
869MODULE_DEVICE_TABLE(usb, uas_usb_ids);
870
871#undef UNUSUAL_DEV
872
873static int uas_switch_interface(struct usb_device *udev,
874 struct usb_interface *intf)
875{
876 struct usb_host_interface *alt;
877
878 alt = uas_find_uas_alt_setting(intf);
879 if (!alt)
880 return -ENODEV;
881
882 return usb_set_interface(udev, alt->desc.bInterfaceNumber,
883 alt->desc.bAlternateSetting);
884}
885
886static 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
919static 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
930static 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
985free_streams:
986 uas_free_streams(devinfo);
987 usb_set_intfdata(intf, NULL);
988set_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
995static 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 */
1019static 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
1043static 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
1068static 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 && err != -ENODEV)
1080 shost_printk(KERN_ERR, shost,
1081 "%s: alloc streams error %d after reset",
1082 __func__, err);
1083
1084 /* we must unblock the host in every case lest we deadlock */
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 err ? 1 : 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");