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Merge remote-tracking branch 'regulator/fix/core' into tmp
[deliverable/linux.git] / drivers / usb / storage / uas.c
1 /*
2 * USB Attached SCSI
3 * Note that this is not the same as the USB Mass Storage driver
4 *
5 * Copyright 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 */
31 struct 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
41 struct uas_dev_info {
42 struct usb_interface *intf;
43 struct usb_device *udev;
44 struct usb_anchor cmd_urbs;
45 struct usb_anchor sense_urbs;
46 struct usb_anchor data_urbs;
47 int qdepth, resetting;
48 struct response_ui response;
49 unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
50 unsigned use_streams:1;
51 unsigned uas_sense_old:1;
52 struct scsi_cmnd *cmnd;
53 spinlock_t lock;
54 };
55
56 enum {
57 SUBMIT_STATUS_URB = (1 << 1),
58 ALLOC_DATA_IN_URB = (1 << 2),
59 SUBMIT_DATA_IN_URB = (1 << 3),
60 ALLOC_DATA_OUT_URB = (1 << 4),
61 SUBMIT_DATA_OUT_URB = (1 << 5),
62 ALLOC_CMD_URB = (1 << 6),
63 SUBMIT_CMD_URB = (1 << 7),
64 COMMAND_INFLIGHT = (1 << 8),
65 DATA_IN_URB_INFLIGHT = (1 << 9),
66 DATA_OUT_URB_INFLIGHT = (1 << 10),
67 COMMAND_COMPLETED = (1 << 11),
68 COMMAND_ABORTED = (1 << 12),
69 UNLINK_DATA_URBS = (1 << 13),
70 IS_IN_WORK_LIST = (1 << 14),
71 };
72
73 /* Overrides scsi_pointer */
74 struct uas_cmd_info {
75 unsigned int state;
76 unsigned int stream;
77 struct urb *cmd_urb;
78 struct urb *data_in_urb;
79 struct urb *data_out_urb;
80 struct list_head list;
81 };
82
83 /* I hate forward declarations, but I actually have a loop */
84 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
85 struct uas_dev_info *devinfo, gfp_t gfp);
86 static void uas_do_work(struct work_struct *work);
87 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
88
89 static DECLARE_WORK(uas_work, uas_do_work);
90 static DEFINE_SPINLOCK(uas_work_lock);
91 static LIST_HEAD(uas_work_list);
92
93 static void uas_unlink_data_urbs(struct uas_dev_info *devinfo,
94 struct uas_cmd_info *cmdinfo)
95 {
96 unsigned long flags;
97
98 /*
99 * The UNLINK_DATA_URBS flag makes sure uas_try_complete
100 * (called by urb completion) doesn't release cmdinfo
101 * underneath us.
102 */
103 spin_lock_irqsave(&devinfo->lock, flags);
104 cmdinfo->state |= UNLINK_DATA_URBS;
105 spin_unlock_irqrestore(&devinfo->lock, flags);
106
107 if (cmdinfo->data_in_urb)
108 usb_unlink_urb(cmdinfo->data_in_urb);
109 if (cmdinfo->data_out_urb)
110 usb_unlink_urb(cmdinfo->data_out_urb);
111
112 spin_lock_irqsave(&devinfo->lock, flags);
113 cmdinfo->state &= ~UNLINK_DATA_URBS;
114 spin_unlock_irqrestore(&devinfo->lock, flags);
115 }
116
117 static void uas_do_work(struct work_struct *work)
118 {
119 struct uas_cmd_info *cmdinfo;
120 struct uas_cmd_info *temp;
121 struct list_head list;
122 unsigned long flags;
123 int err;
124
125 spin_lock_irq(&uas_work_lock);
126 list_replace_init(&uas_work_list, &list);
127 spin_unlock_irq(&uas_work_lock);
128
129 list_for_each_entry_safe(cmdinfo, temp, &list, list) {
130 struct scsi_pointer *scp = (void *)cmdinfo;
131 struct scsi_cmnd *cmnd = container_of(scp,
132 struct scsi_cmnd, SCp);
133 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
134 spin_lock_irqsave(&devinfo->lock, flags);
135 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
136 if (!err)
137 cmdinfo->state &= ~IS_IN_WORK_LIST;
138 spin_unlock_irqrestore(&devinfo->lock, flags);
139 if (err) {
140 list_del(&cmdinfo->list);
141 spin_lock_irq(&uas_work_lock);
142 list_add_tail(&cmdinfo->list, &uas_work_list);
143 spin_unlock_irq(&uas_work_lock);
144 schedule_work(&uas_work);
145 }
146 }
147 }
148
149 static void uas_abort_work(struct uas_dev_info *devinfo)
150 {
151 struct uas_cmd_info *cmdinfo;
152 struct uas_cmd_info *temp;
153 struct list_head list;
154 unsigned long flags;
155
156 spin_lock_irq(&uas_work_lock);
157 list_replace_init(&uas_work_list, &list);
158 spin_unlock_irq(&uas_work_lock);
159
160 spin_lock_irqsave(&devinfo->lock, flags);
161 list_for_each_entry_safe(cmdinfo, temp, &list, list) {
162 struct scsi_pointer *scp = (void *)cmdinfo;
163 struct scsi_cmnd *cmnd = container_of(scp,
164 struct scsi_cmnd, SCp);
165 struct uas_dev_info *di = (void *)cmnd->device->hostdata;
166
167 if (di == devinfo) {
168 cmdinfo->state |= COMMAND_ABORTED;
169 cmdinfo->state &= ~IS_IN_WORK_LIST;
170 if (devinfo->resetting) {
171 /* uas_stat_cmplt() will not do that
172 * when a device reset is in
173 * progress */
174 cmdinfo->state &= ~COMMAND_INFLIGHT;
175 }
176 uas_try_complete(cmnd, __func__);
177 } else {
178 /* not our uas device, relink into list */
179 list_del(&cmdinfo->list);
180 spin_lock_irq(&uas_work_lock);
181 list_add_tail(&cmdinfo->list, &uas_work_list);
182 spin_unlock_irq(&uas_work_lock);
183 }
184 }
185 spin_unlock_irqrestore(&devinfo->lock, flags);
186 }
187
188 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
189 {
190 struct sense_iu *sense_iu = urb->transfer_buffer;
191 struct scsi_device *sdev = cmnd->device;
192
193 if (urb->actual_length > 16) {
194 unsigned len = be16_to_cpup(&sense_iu->len);
195 if (len + 16 != urb->actual_length) {
196 int newlen = min(len + 16, urb->actual_length) - 16;
197 if (newlen < 0)
198 newlen = 0;
199 sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
200 "disagrees with IU sense data length %d, "
201 "using %d bytes of sense data\n", __func__,
202 urb->actual_length, len, newlen);
203 len = newlen;
204 }
205 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
206 }
207
208 cmnd->result = sense_iu->status;
209 }
210
211 static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
212 {
213 struct sense_iu_old *sense_iu = urb->transfer_buffer;
214 struct scsi_device *sdev = cmnd->device;
215
216 if (urb->actual_length > 8) {
217 unsigned len = be16_to_cpup(&sense_iu->len) - 2;
218 if (len + 8 != urb->actual_length) {
219 int newlen = min(len + 8, urb->actual_length) - 8;
220 if (newlen < 0)
221 newlen = 0;
222 sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
223 "disagrees with IU sense data length %d, "
224 "using %d bytes of sense data\n", __func__,
225 urb->actual_length, len, newlen);
226 len = newlen;
227 }
228 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
229 }
230
231 cmnd->result = sense_iu->status;
232 }
233
234 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller)
235 {
236 struct uas_cmd_info *ci = (void *)&cmnd->SCp;
237
238 scmd_printk(KERN_INFO, cmnd, "%s %p tag %d, inflight:"
239 "%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
240 caller, cmnd, cmnd->request->tag,
241 (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
242 (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
243 (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "",
244 (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "",
245 (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "",
246 (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "",
247 (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "",
248 (ci->state & COMMAND_INFLIGHT) ? " CMD" : "",
249 (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
250 (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
251 (ci->state & COMMAND_COMPLETED) ? " done" : "",
252 (ci->state & COMMAND_ABORTED) ? " abort" : "",
253 (ci->state & UNLINK_DATA_URBS) ? " unlink": "",
254 (ci->state & IS_IN_WORK_LIST) ? " work" : "");
255 }
256
257 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
258 {
259 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
260 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
261
262 WARN_ON(!spin_is_locked(&devinfo->lock));
263 if (cmdinfo->state & (COMMAND_INFLIGHT |
264 DATA_IN_URB_INFLIGHT |
265 DATA_OUT_URB_INFLIGHT |
266 UNLINK_DATA_URBS))
267 return -EBUSY;
268 BUG_ON(cmdinfo->state & COMMAND_COMPLETED);
269 cmdinfo->state |= COMMAND_COMPLETED;
270 usb_free_urb(cmdinfo->data_in_urb);
271 usb_free_urb(cmdinfo->data_out_urb);
272 if (cmdinfo->state & COMMAND_ABORTED) {
273 scmd_printk(KERN_INFO, cmnd, "abort completed\n");
274 cmnd->result = DID_ABORT << 16;
275 }
276 cmnd->scsi_done(cmnd);
277 return 0;
278 }
279
280 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
281 unsigned direction)
282 {
283 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
284 int err;
285
286 cmdinfo->state |= direction | SUBMIT_STATUS_URB;
287 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
288 if (err) {
289 spin_lock(&uas_work_lock);
290 list_add_tail(&cmdinfo->list, &uas_work_list);
291 cmdinfo->state |= IS_IN_WORK_LIST;
292 spin_unlock(&uas_work_lock);
293 schedule_work(&uas_work);
294 }
295 }
296
297 static void uas_stat_cmplt(struct urb *urb)
298 {
299 struct iu *iu = urb->transfer_buffer;
300 struct Scsi_Host *shost = urb->context;
301 struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
302 struct scsi_cmnd *cmnd;
303 struct uas_cmd_info *cmdinfo;
304 unsigned long flags;
305 u16 tag;
306
307 if (urb->status) {
308 dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status);
309 usb_free_urb(urb);
310 return;
311 }
312
313 if (devinfo->resetting) {
314 usb_free_urb(urb);
315 return;
316 }
317
318 spin_lock_irqsave(&devinfo->lock, flags);
319 tag = be16_to_cpup(&iu->tag) - 1;
320 if (tag == 0)
321 cmnd = devinfo->cmnd;
322 else
323 cmnd = scsi_host_find_tag(shost, tag - 1);
324
325 if (!cmnd) {
326 if (iu->iu_id == IU_ID_RESPONSE) {
327 /* store results for uas_eh_task_mgmt() */
328 memcpy(&devinfo->response, iu, sizeof(devinfo->response));
329 }
330 usb_free_urb(urb);
331 spin_unlock_irqrestore(&devinfo->lock, flags);
332 return;
333 }
334
335 cmdinfo = (void *)&cmnd->SCp;
336 switch (iu->iu_id) {
337 case IU_ID_STATUS:
338 if (devinfo->cmnd == cmnd)
339 devinfo->cmnd = NULL;
340
341 if (urb->actual_length < 16)
342 devinfo->uas_sense_old = 1;
343 if (devinfo->uas_sense_old)
344 uas_sense_old(urb, cmnd);
345 else
346 uas_sense(urb, cmnd);
347 if (cmnd->result != 0) {
348 /* cancel data transfers on error */
349 spin_unlock_irqrestore(&devinfo->lock, flags);
350 uas_unlink_data_urbs(devinfo, cmdinfo);
351 spin_lock_irqsave(&devinfo->lock, flags);
352 }
353 cmdinfo->state &= ~COMMAND_INFLIGHT;
354 uas_try_complete(cmnd, __func__);
355 break;
356 case IU_ID_READ_READY:
357 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
358 break;
359 case IU_ID_WRITE_READY:
360 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
361 break;
362 default:
363 scmd_printk(KERN_ERR, cmnd,
364 "Bogus IU (%d) received on status pipe\n", iu->iu_id);
365 }
366 usb_free_urb(urb);
367 spin_unlock_irqrestore(&devinfo->lock, flags);
368 }
369
370 static void uas_data_cmplt(struct urb *urb)
371 {
372 struct scsi_cmnd *cmnd = urb->context;
373 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
374 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
375 struct scsi_data_buffer *sdb = NULL;
376 unsigned long flags;
377
378 spin_lock_irqsave(&devinfo->lock, flags);
379 if (cmdinfo->data_in_urb == urb) {
380 sdb = scsi_in(cmnd);
381 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
382 } else if (cmdinfo->data_out_urb == urb) {
383 sdb = scsi_out(cmnd);
384 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
385 }
386 BUG_ON(sdb == NULL);
387 if (urb->status) {
388 /* error: no data transfered */
389 sdb->resid = sdb->length;
390 } else {
391 sdb->resid = sdb->length - urb->actual_length;
392 }
393 uas_try_complete(cmnd, __func__);
394 spin_unlock_irqrestore(&devinfo->lock, flags);
395 }
396
397 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
398 unsigned int pipe, u16 stream_id,
399 struct scsi_cmnd *cmnd,
400 enum dma_data_direction dir)
401 {
402 struct usb_device *udev = devinfo->udev;
403 struct urb *urb = usb_alloc_urb(0, gfp);
404 struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
405 ? scsi_in(cmnd) : scsi_out(cmnd);
406
407 if (!urb)
408 goto out;
409 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
410 uas_data_cmplt, cmnd);
411 if (devinfo->use_streams)
412 urb->stream_id = stream_id;
413 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
414 urb->sg = sdb->table.sgl;
415 out:
416 return urb;
417 }
418
419 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
420 struct Scsi_Host *shost, u16 stream_id)
421 {
422 struct usb_device *udev = devinfo->udev;
423 struct urb *urb = usb_alloc_urb(0, gfp);
424 struct sense_iu *iu;
425
426 if (!urb)
427 goto out;
428
429 iu = kzalloc(sizeof(*iu), gfp);
430 if (!iu)
431 goto free;
432
433 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
434 uas_stat_cmplt, shost);
435 urb->stream_id = stream_id;
436 urb->transfer_flags |= URB_FREE_BUFFER;
437 out:
438 return urb;
439 free:
440 usb_free_urb(urb);
441 return NULL;
442 }
443
444 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
445 struct scsi_cmnd *cmnd, u16 stream_id)
446 {
447 struct usb_device *udev = devinfo->udev;
448 struct scsi_device *sdev = cmnd->device;
449 struct urb *urb = usb_alloc_urb(0, gfp);
450 struct command_iu *iu;
451 int len;
452
453 if (!urb)
454 goto out;
455
456 len = cmnd->cmd_len - 16;
457 if (len < 0)
458 len = 0;
459 len = ALIGN(len, 4);
460 iu = kzalloc(sizeof(*iu) + len, gfp);
461 if (!iu)
462 goto free;
463
464 iu->iu_id = IU_ID_COMMAND;
465 if (blk_rq_tagged(cmnd->request))
466 iu->tag = cpu_to_be16(cmnd->request->tag + 2);
467 else
468 iu->tag = cpu_to_be16(1);
469 iu->prio_attr = UAS_SIMPLE_TAG;
470 iu->len = len;
471 int_to_scsilun(sdev->lun, &iu->lun);
472 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
473
474 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
475 usb_free_urb, NULL);
476 urb->transfer_flags |= URB_FREE_BUFFER;
477 out:
478 return urb;
479 free:
480 usb_free_urb(urb);
481 return NULL;
482 }
483
484 static int uas_submit_task_urb(struct scsi_cmnd *cmnd, gfp_t gfp,
485 u8 function, u16 stream_id)
486 {
487 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
488 struct usb_device *udev = devinfo->udev;
489 struct urb *urb = usb_alloc_urb(0, gfp);
490 struct task_mgmt_iu *iu;
491 int err = -ENOMEM;
492
493 if (!urb)
494 goto err;
495
496 iu = kzalloc(sizeof(*iu), gfp);
497 if (!iu)
498 goto err;
499
500 iu->iu_id = IU_ID_TASK_MGMT;
501 iu->tag = cpu_to_be16(stream_id);
502 int_to_scsilun(cmnd->device->lun, &iu->lun);
503
504 iu->function = function;
505 switch (function) {
506 case TMF_ABORT_TASK:
507 if (blk_rq_tagged(cmnd->request))
508 iu->task_tag = cpu_to_be16(cmnd->request->tag + 2);
509 else
510 iu->task_tag = cpu_to_be16(1);
511 break;
512 }
513
514 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu),
515 usb_free_urb, NULL);
516 urb->transfer_flags |= URB_FREE_BUFFER;
517
518 err = usb_submit_urb(urb, gfp);
519 if (err)
520 goto err;
521 usb_anchor_urb(urb, &devinfo->cmd_urbs);
522
523 return 0;
524
525 err:
526 usb_free_urb(urb);
527 return err;
528 }
529
530 /*
531 * Why should I request the Status IU before sending the Command IU? Spec
532 * says to, but also says the device may receive them in any order. Seems
533 * daft to me.
534 */
535
536 static int uas_submit_sense_urb(struct Scsi_Host *shost,
537 gfp_t gfp, unsigned int stream)
538 {
539 struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
540 struct urb *urb;
541
542 urb = uas_alloc_sense_urb(devinfo, gfp, shost, stream);
543 if (!urb)
544 return SCSI_MLQUEUE_DEVICE_BUSY;
545 if (usb_submit_urb(urb, gfp)) {
546 shost_printk(KERN_INFO, shost,
547 "sense urb submission failure\n");
548 usb_free_urb(urb);
549 return SCSI_MLQUEUE_DEVICE_BUSY;
550 }
551 usb_anchor_urb(urb, &devinfo->sense_urbs);
552 return 0;
553 }
554
555 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
556 struct uas_dev_info *devinfo, gfp_t gfp)
557 {
558 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
559 int err;
560
561 WARN_ON(!spin_is_locked(&devinfo->lock));
562 if (cmdinfo->state & SUBMIT_STATUS_URB) {
563 err = uas_submit_sense_urb(cmnd->device->host, gfp,
564 cmdinfo->stream);
565 if (err) {
566 return err;
567 }
568 cmdinfo->state &= ~SUBMIT_STATUS_URB;
569 }
570
571 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
572 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
573 devinfo->data_in_pipe, cmdinfo->stream,
574 cmnd, DMA_FROM_DEVICE);
575 if (!cmdinfo->data_in_urb)
576 return SCSI_MLQUEUE_DEVICE_BUSY;
577 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
578 }
579
580 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
581 if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
582 scmd_printk(KERN_INFO, cmnd,
583 "data in urb submission failure\n");
584 return SCSI_MLQUEUE_DEVICE_BUSY;
585 }
586 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
587 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
588 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
589 }
590
591 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
592 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
593 devinfo->data_out_pipe, cmdinfo->stream,
594 cmnd, DMA_TO_DEVICE);
595 if (!cmdinfo->data_out_urb)
596 return SCSI_MLQUEUE_DEVICE_BUSY;
597 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
598 }
599
600 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
601 if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
602 scmd_printk(KERN_INFO, cmnd,
603 "data out urb submission failure\n");
604 return SCSI_MLQUEUE_DEVICE_BUSY;
605 }
606 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
607 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
608 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
609 }
610
611 if (cmdinfo->state & ALLOC_CMD_URB) {
612 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd,
613 cmdinfo->stream);
614 if (!cmdinfo->cmd_urb)
615 return SCSI_MLQUEUE_DEVICE_BUSY;
616 cmdinfo->state &= ~ALLOC_CMD_URB;
617 }
618
619 if (cmdinfo->state & SUBMIT_CMD_URB) {
620 usb_get_urb(cmdinfo->cmd_urb);
621 if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
622 scmd_printk(KERN_INFO, cmnd,
623 "cmd urb submission failure\n");
624 return SCSI_MLQUEUE_DEVICE_BUSY;
625 }
626 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
627 usb_put_urb(cmdinfo->cmd_urb);
628 cmdinfo->cmd_urb = NULL;
629 cmdinfo->state &= ~SUBMIT_CMD_URB;
630 cmdinfo->state |= COMMAND_INFLIGHT;
631 }
632
633 return 0;
634 }
635
636 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
637 void (*done)(struct scsi_cmnd *))
638 {
639 struct scsi_device *sdev = cmnd->device;
640 struct uas_dev_info *devinfo = sdev->hostdata;
641 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
642 unsigned long flags;
643 int err;
644
645 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
646
647 if (devinfo->resetting) {
648 cmnd->result = DID_ERROR << 16;
649 cmnd->scsi_done(cmnd);
650 return 0;
651 }
652
653 spin_lock_irqsave(&devinfo->lock, flags);
654 if (devinfo->cmnd) {
655 spin_unlock_irqrestore(&devinfo->lock, flags);
656 return SCSI_MLQUEUE_DEVICE_BUSY;
657 }
658
659 if (blk_rq_tagged(cmnd->request)) {
660 cmdinfo->stream = cmnd->request->tag + 2;
661 } else {
662 devinfo->cmnd = cmnd;
663 cmdinfo->stream = 1;
664 }
665
666 cmnd->scsi_done = done;
667
668 cmdinfo->state = SUBMIT_STATUS_URB |
669 ALLOC_CMD_URB | SUBMIT_CMD_URB;
670
671 switch (cmnd->sc_data_direction) {
672 case DMA_FROM_DEVICE:
673 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
674 break;
675 case DMA_BIDIRECTIONAL:
676 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
677 case DMA_TO_DEVICE:
678 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
679 case DMA_NONE:
680 break;
681 }
682
683 if (!devinfo->use_streams) {
684 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
685 cmdinfo->stream = 0;
686 }
687
688 err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
689 if (err) {
690 /* If we did nothing, give up now */
691 if (cmdinfo->state & SUBMIT_STATUS_URB) {
692 spin_unlock_irqrestore(&devinfo->lock, flags);
693 return SCSI_MLQUEUE_DEVICE_BUSY;
694 }
695 spin_lock(&uas_work_lock);
696 list_add_tail(&cmdinfo->list, &uas_work_list);
697 cmdinfo->state |= IS_IN_WORK_LIST;
698 spin_unlock(&uas_work_lock);
699 schedule_work(&uas_work);
700 }
701
702 spin_unlock_irqrestore(&devinfo->lock, flags);
703 return 0;
704 }
705
706 static DEF_SCSI_QCMD(uas_queuecommand)
707
708 static int uas_eh_task_mgmt(struct scsi_cmnd *cmnd,
709 const char *fname, u8 function)
710 {
711 struct Scsi_Host *shost = cmnd->device->host;
712 struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
713 u16 tag = devinfo->qdepth - 1;
714 unsigned long flags;
715
716 spin_lock_irqsave(&devinfo->lock, flags);
717 memset(&devinfo->response, 0, sizeof(devinfo->response));
718 if (uas_submit_sense_urb(shost, GFP_ATOMIC, tag)) {
719 shost_printk(KERN_INFO, shost,
720 "%s: %s: submit sense urb failed\n",
721 __func__, fname);
722 spin_unlock_irqrestore(&devinfo->lock, flags);
723 return FAILED;
724 }
725 if (uas_submit_task_urb(cmnd, GFP_ATOMIC, function, tag)) {
726 shost_printk(KERN_INFO, shost,
727 "%s: %s: submit task mgmt urb failed\n",
728 __func__, fname);
729 spin_unlock_irqrestore(&devinfo->lock, flags);
730 return FAILED;
731 }
732 spin_unlock_irqrestore(&devinfo->lock, flags);
733
734 if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 3000) == 0) {
735 shost_printk(KERN_INFO, shost,
736 "%s: %s timed out\n", __func__, fname);
737 return FAILED;
738 }
739 if (be16_to_cpu(devinfo->response.tag) != tag) {
740 shost_printk(KERN_INFO, shost,
741 "%s: %s failed (wrong tag %d/%d)\n", __func__,
742 fname, be16_to_cpu(devinfo->response.tag), tag);
743 return FAILED;
744 }
745 if (devinfo->response.response_code != RC_TMF_COMPLETE) {
746 shost_printk(KERN_INFO, shost,
747 "%s: %s failed (rc 0x%x)\n", __func__,
748 fname, devinfo->response.response_code);
749 return FAILED;
750 }
751 return SUCCESS;
752 }
753
754 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
755 {
756 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
757 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
758 unsigned long flags;
759 int ret;
760
761 uas_log_cmd_state(cmnd, __func__);
762 spin_lock_irqsave(&devinfo->lock, flags);
763 cmdinfo->state |= COMMAND_ABORTED;
764 if (cmdinfo->state & IS_IN_WORK_LIST) {
765 spin_lock(&uas_work_lock);
766 list_del(&cmdinfo->list);
767 cmdinfo->state &= ~IS_IN_WORK_LIST;
768 spin_unlock(&uas_work_lock);
769 }
770 if (cmdinfo->state & COMMAND_INFLIGHT) {
771 spin_unlock_irqrestore(&devinfo->lock, flags);
772 ret = uas_eh_task_mgmt(cmnd, "ABORT TASK", TMF_ABORT_TASK);
773 } else {
774 spin_unlock_irqrestore(&devinfo->lock, flags);
775 uas_unlink_data_urbs(devinfo, cmdinfo);
776 spin_lock_irqsave(&devinfo->lock, flags);
777 uas_try_complete(cmnd, __func__);
778 spin_unlock_irqrestore(&devinfo->lock, flags);
779 ret = SUCCESS;
780 }
781 return ret;
782 }
783
784 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
785 {
786 sdev_printk(KERN_INFO, cmnd->device, "%s\n", __func__);
787 return uas_eh_task_mgmt(cmnd, "LOGICAL UNIT RESET",
788 TMF_LOGICAL_UNIT_RESET);
789 }
790
791 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
792 {
793 struct scsi_device *sdev = cmnd->device;
794 struct uas_dev_info *devinfo = sdev->hostdata;
795 struct usb_device *udev = devinfo->udev;
796 int err;
797
798 devinfo->resetting = 1;
799 uas_abort_work(devinfo);
800 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
801 usb_kill_anchored_urbs(&devinfo->sense_urbs);
802 usb_kill_anchored_urbs(&devinfo->data_urbs);
803 err = usb_reset_device(udev);
804 devinfo->resetting = 0;
805
806 if (err) {
807 shost_printk(KERN_INFO, sdev->host, "%s FAILED\n", __func__);
808 return FAILED;
809 }
810
811 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
812 return SUCCESS;
813 }
814
815 static int uas_slave_alloc(struct scsi_device *sdev)
816 {
817 sdev->hostdata = (void *)sdev->host->hostdata[0];
818 return 0;
819 }
820
821 static int uas_slave_configure(struct scsi_device *sdev)
822 {
823 struct uas_dev_info *devinfo = sdev->hostdata;
824 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
825 scsi_activate_tcq(sdev, devinfo->qdepth - 3);
826 return 0;
827 }
828
829 static struct scsi_host_template uas_host_template = {
830 .module = THIS_MODULE,
831 .name = "uas",
832 .queuecommand = uas_queuecommand,
833 .slave_alloc = uas_slave_alloc,
834 .slave_configure = uas_slave_configure,
835 .eh_abort_handler = uas_eh_abort_handler,
836 .eh_device_reset_handler = uas_eh_device_reset_handler,
837 .eh_bus_reset_handler = uas_eh_bus_reset_handler,
838 .can_queue = 65536, /* Is there a limit on the _host_ ? */
839 .this_id = -1,
840 .sg_tablesize = SG_NONE,
841 .cmd_per_lun = 1, /* until we override it */
842 .skip_settle_delay = 1,
843 .ordered_tag = 1,
844 };
845
846 static struct usb_device_id uas_usb_ids[] = {
847 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
848 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
849 /* 0xaa is a prototype device I happen to have access to */
850 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
851 { }
852 };
853 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
854
855 static int uas_is_interface(struct usb_host_interface *intf)
856 {
857 return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE &&
858 intf->desc.bInterfaceSubClass == USB_SC_SCSI &&
859 intf->desc.bInterfaceProtocol == USB_PR_UAS);
860 }
861
862 static int uas_isnt_supported(struct usb_device *udev)
863 {
864 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
865
866 dev_warn(&udev->dev, "The driver for the USB controller %s does not "
867 "support scatter-gather which is\n",
868 hcd->driver->description);
869 dev_warn(&udev->dev, "required by the UAS driver. Please try an"
870 "alternative USB controller if you wish to use UAS.\n");
871 return -ENODEV;
872 }
873
874 static int uas_switch_interface(struct usb_device *udev,
875 struct usb_interface *intf)
876 {
877 int i;
878 int sg_supported = udev->bus->sg_tablesize != 0;
879
880 for (i = 0; i < intf->num_altsetting; i++) {
881 struct usb_host_interface *alt = &intf->altsetting[i];
882
883 if (uas_is_interface(alt)) {
884 if (!sg_supported)
885 return uas_isnt_supported(udev);
886 return usb_set_interface(udev,
887 alt->desc.bInterfaceNumber,
888 alt->desc.bAlternateSetting);
889 }
890 }
891
892 return -ENODEV;
893 }
894
895 static void uas_configure_endpoints(struct uas_dev_info *devinfo)
896 {
897 struct usb_host_endpoint *eps[4] = { };
898 struct usb_interface *intf = devinfo->intf;
899 struct usb_device *udev = devinfo->udev;
900 struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;
901 unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints;
902
903 devinfo->uas_sense_old = 0;
904 devinfo->cmnd = NULL;
905
906 for (i = 0; i < n_endpoints; i++) {
907 unsigned char *extra = endpoint[i].extra;
908 int len = endpoint[i].extralen;
909 while (len > 1) {
910 if (extra[1] == USB_DT_PIPE_USAGE) {
911 unsigned pipe_id = extra[2];
912 if (pipe_id > 0 && pipe_id < 5)
913 eps[pipe_id - 1] = &endpoint[i];
914 break;
915 }
916 len -= extra[0];
917 extra += extra[0];
918 }
919 }
920
921 /*
922 * Assume that if we didn't find a control pipe descriptor, we're
923 * using a device with old firmware that happens to be set up like
924 * this.
925 */
926 if (!eps[0]) {
927 devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1);
928 devinfo->status_pipe = usb_rcvbulkpipe(udev, 1);
929 devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2);
930 devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2);
931
932 eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe);
933 eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
934 eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
935 } else {
936 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
937 eps[0]->desc.bEndpointAddress);
938 devinfo->status_pipe = usb_rcvbulkpipe(udev,
939 eps[1]->desc.bEndpointAddress);
940 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
941 eps[2]->desc.bEndpointAddress);
942 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
943 eps[3]->desc.bEndpointAddress);
944 }
945
946 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256,
947 GFP_KERNEL);
948 if (devinfo->qdepth < 0) {
949 devinfo->qdepth = 256;
950 devinfo->use_streams = 0;
951 } else {
952 devinfo->use_streams = 1;
953 }
954 }
955
956 static void uas_free_streams(struct uas_dev_info *devinfo)
957 {
958 struct usb_device *udev = devinfo->udev;
959 struct usb_host_endpoint *eps[3];
960
961 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
962 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
963 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
964 usb_free_streams(devinfo->intf, eps, 3, GFP_KERNEL);
965 }
966
967 /*
968 * XXX: What I'd like to do here is register a SCSI host for each USB host in
969 * the system. Follow usb-storage's design of registering a SCSI host for
970 * each USB device for the moment. Can implement this by walking up the
971 * USB hierarchy until we find a USB host.
972 */
973 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
974 {
975 int result;
976 struct Scsi_Host *shost;
977 struct uas_dev_info *devinfo;
978 struct usb_device *udev = interface_to_usbdev(intf);
979
980 if (uas_switch_interface(udev, intf))
981 return -ENODEV;
982
983 devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL);
984 if (!devinfo)
985 return -ENOMEM;
986
987 result = -ENOMEM;
988 shost = scsi_host_alloc(&uas_host_template, sizeof(void *));
989 if (!shost)
990 goto free;
991
992 shost->max_cmd_len = 16 + 252;
993 shost->max_id = 1;
994 shost->max_lun = 256;
995 shost->max_channel = 0;
996 shost->sg_tablesize = udev->bus->sg_tablesize;
997
998 devinfo->intf = intf;
999 devinfo->udev = udev;
1000 devinfo->resetting = 0;
1001 init_usb_anchor(&devinfo->cmd_urbs);
1002 init_usb_anchor(&devinfo->sense_urbs);
1003 init_usb_anchor(&devinfo->data_urbs);
1004 spin_lock_init(&devinfo->lock);
1005 uas_configure_endpoints(devinfo);
1006
1007 result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 3);
1008 if (result)
1009 goto free;
1010
1011 result = scsi_add_host(shost, &intf->dev);
1012 if (result)
1013 goto deconfig_eps;
1014
1015 shost->hostdata[0] = (unsigned long)devinfo;
1016
1017 scsi_scan_host(shost);
1018 usb_set_intfdata(intf, shost);
1019 return result;
1020
1021 deconfig_eps:
1022 uas_free_streams(devinfo);
1023 free:
1024 kfree(devinfo);
1025 if (shost)
1026 scsi_host_put(shost);
1027 return result;
1028 }
1029
1030 static int uas_pre_reset(struct usb_interface *intf)
1031 {
1032 /* XXX: Need to return 1 if it's not our device in error handling */
1033 return 0;
1034 }
1035
1036 static int uas_post_reset(struct usb_interface *intf)
1037 {
1038 /* XXX: Need to return 1 if it's not our device in error handling */
1039 return 0;
1040 }
1041
1042 static void uas_disconnect(struct usb_interface *intf)
1043 {
1044 struct Scsi_Host *shost = usb_get_intfdata(intf);
1045 struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
1046
1047 devinfo->resetting = 1;
1048 uas_abort_work(devinfo);
1049 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1050 usb_kill_anchored_urbs(&devinfo->sense_urbs);
1051 usb_kill_anchored_urbs(&devinfo->data_urbs);
1052 scsi_remove_host(shost);
1053 uas_free_streams(devinfo);
1054 kfree(devinfo);
1055 }
1056
1057 /*
1058 * XXX: Should this plug into libusual so we can auto-upgrade devices from
1059 * Bulk-Only to UAS?
1060 */
1061 static struct usb_driver uas_driver = {
1062 .name = "uas",
1063 .probe = uas_probe,
1064 .disconnect = uas_disconnect,
1065 .pre_reset = uas_pre_reset,
1066 .post_reset = uas_post_reset,
1067 .id_table = uas_usb_ids,
1068 };
1069
1070 module_usb_driver(uas_driver);
1071
1072 MODULE_LICENSE("GPL");
1073 MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp");
Linux kernel - Deliverables
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