3 * Note that this is not the same as the USB Mass Storage driver
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
9 * Distributed under the terms of the GNU GPL, version two.
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>
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>
30 #include "uas-detect.h"
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;
42 int qdepth, resetting;
43 unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
44 unsigned use_streams:1;
46 struct scsi_cmnd *cmnd[MAX_CMNDS];
48 struct work_struct work;
52 SUBMIT_STATUS_URB = (1 << 1),
53 ALLOC_DATA_IN_URB = (1 << 2),
54 SUBMIT_DATA_IN_URB = (1 << 3),
55 ALLOC_DATA_OUT_URB = (1 << 4),
56 SUBMIT_DATA_OUT_URB = (1 << 5),
57 ALLOC_CMD_URB = (1 << 6),
58 SUBMIT_CMD_URB = (1 << 7),
59 COMMAND_INFLIGHT = (1 << 8),
60 DATA_IN_URB_INFLIGHT = (1 << 9),
61 DATA_OUT_URB_INFLIGHT = (1 << 10),
62 COMMAND_ABORTED = (1 << 11),
63 IS_IN_WORK_LIST = (1 << 12),
66 /* Overrides scsi_pointer */
71 struct urb *data_in_urb;
72 struct urb *data_out_urb;
75 /* I hate forward declarations, but I actually have a loop */
76 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
77 struct uas_dev_info *devinfo, gfp_t gfp);
78 static void uas_do_work(struct work_struct *work);
79 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
80 static void uas_free_streams(struct uas_dev_info *devinfo);
81 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
84 static void uas_do_work(struct work_struct *work)
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;
93 spin_lock_irqsave(&devinfo->lock, flags);
95 if (devinfo->resetting)
98 for (i = 0; i < devinfo->qdepth; i++) {
99 if (!devinfo->cmnd[i])
102 cmnd = devinfo->cmnd[i];
103 cmdinfo = (void *)&cmnd->SCp;
105 if (!(cmdinfo->state & IS_IN_WORK_LIST))
108 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
110 cmdinfo->state &= ~IS_IN_WORK_LIST;
112 schedule_work(&devinfo->work);
115 spin_unlock_irqrestore(&devinfo->lock, flags);
118 static void uas_add_work(struct uas_cmd_info *cmdinfo)
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;
124 lockdep_assert_held(&devinfo->lock);
125 cmdinfo->state |= IS_IN_WORK_LIST;
126 schedule_work(&devinfo->work);
129 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
131 struct uas_cmd_info *cmdinfo;
132 struct scsi_cmnd *cmnd;
136 spin_lock_irqsave(&devinfo->lock, flags);
137 for (i = 0; i < devinfo->qdepth; i++) {
138 if (!devinfo->cmnd[i])
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__);
150 spin_unlock_irqrestore(&devinfo->lock, flags);
153 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
155 struct sense_iu *sense_iu = urb->transfer_buffer;
156 struct scsi_device *sdev = cmnd->device;
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;
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);
170 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
173 cmnd->result = sense_iu->status;
176 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
179 struct uas_cmd_info *ci = (void *)&cmnd->SCp;
180 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
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);
200 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
202 struct uas_cmd_info *cmdinfo;
207 cmdinfo = (void *)&cmnd->SCp;
209 if (cmdinfo->state & SUBMIT_CMD_URB)
210 usb_free_urb(cmdinfo->cmd_urb);
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);
219 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
221 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
222 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
224 lockdep_assert_held(&devinfo->lock);
225 if (cmdinfo->state & (COMMAND_INFLIGHT |
226 DATA_IN_URB_INFLIGHT |
227 DATA_OUT_URB_INFLIGHT |
230 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
231 uas_free_unsubmitted_urbs(cmnd);
232 cmnd->scsi_done(cmnd);
236 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
239 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
242 cmdinfo->state |= direction | SUBMIT_STATUS_URB;
243 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
245 uas_add_work(cmdinfo);
249 static void uas_stat_cmplt(struct urb *urb)
251 struct iu *iu = urb->transfer_buffer;
252 struct Scsi_Host *shost = urb->context;
253 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
254 struct urb *data_in_urb = NULL;
255 struct urb *data_out_urb = NULL;
256 struct scsi_cmnd *cmnd;
257 struct uas_cmd_info *cmdinfo;
260 int status = urb->status;
262 spin_lock_irqsave(&devinfo->lock, flags);
264 if (devinfo->resetting)
268 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
269 dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
273 idx = be16_to_cpup(&iu->tag) - 1;
274 if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
275 dev_err(&urb->dev->dev,
276 "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
280 cmnd = devinfo->cmnd[idx];
281 cmdinfo = (void *)&cmnd->SCp;
283 if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
284 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
290 uas_sense(urb, cmnd);
291 if (cmnd->result != 0) {
292 /* cancel data transfers on error */
293 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
294 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
296 cmdinfo->state &= ~COMMAND_INFLIGHT;
297 uas_try_complete(cmnd, __func__);
299 case IU_ID_READ_READY:
300 if (!cmdinfo->data_in_urb ||
301 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
302 uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
305 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
307 case IU_ID_WRITE_READY:
308 if (!cmdinfo->data_out_urb ||
309 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
310 uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
313 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
316 uas_log_cmd_state(cmnd, "unexpected response iu",
317 ((struct response_iu *)iu)->response_code);
318 /* Error, cancel data transfers */
319 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
320 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
321 cmdinfo->state &= ~COMMAND_INFLIGHT;
322 cmnd->result = DID_ERROR << 16;
323 uas_try_complete(cmnd, __func__);
326 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
330 spin_unlock_irqrestore(&devinfo->lock, flags);
332 /* Unlinking of data urbs must be done without holding the lock */
334 usb_unlink_urb(data_in_urb);
335 usb_put_urb(data_in_urb);
338 usb_unlink_urb(data_out_urb);
339 usb_put_urb(data_out_urb);
343 static void uas_data_cmplt(struct urb *urb)
345 struct scsi_cmnd *cmnd = urb->context;
346 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
347 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
348 struct scsi_data_buffer *sdb = NULL;
350 int status = urb->status;
352 spin_lock_irqsave(&devinfo->lock, flags);
354 if (cmdinfo->data_in_urb == urb) {
356 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
357 cmdinfo->data_in_urb = NULL;
358 } else if (cmdinfo->data_out_urb == urb) {
359 sdb = scsi_out(cmnd);
360 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
361 cmdinfo->data_out_urb = NULL;
368 if (devinfo->resetting)
371 /* Data urbs should not complete before the cmd urb is submitted */
372 if (cmdinfo->state & SUBMIT_CMD_URB) {
373 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
378 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
379 uas_log_cmd_state(cmnd, "data cmplt err", status);
380 /* error: no data transfered */
381 sdb->resid = sdb->length;
383 sdb->resid = sdb->length - urb->actual_length;
385 uas_try_complete(cmnd, __func__);
388 spin_unlock_irqrestore(&devinfo->lock, flags);
391 static void uas_cmd_cmplt(struct urb *urb)
394 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
399 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
400 struct scsi_cmnd *cmnd,
401 enum dma_data_direction dir)
403 struct usb_device *udev = devinfo->udev;
404 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
405 struct urb *urb = usb_alloc_urb(0, gfp);
406 struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
407 ? scsi_in(cmnd) : scsi_out(cmnd);
408 unsigned int pipe = (dir == DMA_FROM_DEVICE)
409 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
413 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
414 uas_data_cmplt, cmnd);
415 if (devinfo->use_streams)
416 urb->stream_id = cmdinfo->uas_tag;
417 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
418 urb->sg = sdb->table.sgl;
423 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
424 struct scsi_cmnd *cmnd)
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);
434 iu = kzalloc(sizeof(*iu), gfp);
438 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
439 uas_stat_cmplt, cmnd->device->host);
440 if (devinfo->use_streams)
441 urb->stream_id = cmdinfo->uas_tag;
442 urb->transfer_flags |= URB_FREE_BUFFER;
450 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
451 struct scsi_cmnd *cmnd)
453 struct usb_device *udev = devinfo->udev;
454 struct scsi_device *sdev = cmnd->device;
455 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
456 struct urb *urb = usb_alloc_urb(0, gfp);
457 struct command_iu *iu;
463 len = cmnd->cmd_len - 16;
467 iu = kzalloc(sizeof(*iu) + len, gfp);
471 iu->iu_id = IU_ID_COMMAND;
472 iu->tag = cpu_to_be16(cmdinfo->uas_tag);
473 iu->prio_attr = UAS_SIMPLE_TAG;
475 int_to_scsilun(sdev->lun, &iu->lun);
476 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
478 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
479 uas_cmd_cmplt, NULL);
480 urb->transfer_flags |= URB_FREE_BUFFER;
489 * Why should I request the Status IU before sending the Command IU? Spec
490 * says to, but also says the device may receive them in any order. Seems
494 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
496 struct uas_dev_info *devinfo = cmnd->device->hostdata;
500 urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
503 usb_anchor_urb(urb, &devinfo->sense_urbs);
504 err = usb_submit_urb(urb, gfp);
506 usb_unanchor_urb(urb);
507 uas_log_cmd_state(cmnd, "sense submit err", err);
514 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
515 struct uas_dev_info *devinfo, gfp_t gfp)
517 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
521 lockdep_assert_held(&devinfo->lock);
522 if (cmdinfo->state & SUBMIT_STATUS_URB) {
523 urb = uas_submit_sense_urb(cmnd, gfp);
525 return SCSI_MLQUEUE_DEVICE_BUSY;
526 cmdinfo->state &= ~SUBMIT_STATUS_URB;
529 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
530 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
531 cmnd, DMA_FROM_DEVICE);
532 if (!cmdinfo->data_in_urb)
533 return SCSI_MLQUEUE_DEVICE_BUSY;
534 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
537 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
538 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
539 err = usb_submit_urb(cmdinfo->data_in_urb, gfp);
541 usb_unanchor_urb(cmdinfo->data_in_urb);
542 uas_log_cmd_state(cmnd, "data in submit err", err);
543 return SCSI_MLQUEUE_DEVICE_BUSY;
545 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
546 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
549 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
550 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
551 cmnd, DMA_TO_DEVICE);
552 if (!cmdinfo->data_out_urb)
553 return SCSI_MLQUEUE_DEVICE_BUSY;
554 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
557 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
558 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
559 err = usb_submit_urb(cmdinfo->data_out_urb, gfp);
561 usb_unanchor_urb(cmdinfo->data_out_urb);
562 uas_log_cmd_state(cmnd, "data out submit err", err);
563 return SCSI_MLQUEUE_DEVICE_BUSY;
565 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
566 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
569 if (cmdinfo->state & ALLOC_CMD_URB) {
570 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd);
571 if (!cmdinfo->cmd_urb)
572 return SCSI_MLQUEUE_DEVICE_BUSY;
573 cmdinfo->state &= ~ALLOC_CMD_URB;
576 if (cmdinfo->state & SUBMIT_CMD_URB) {
577 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
578 err = usb_submit_urb(cmdinfo->cmd_urb, gfp);
580 usb_unanchor_urb(cmdinfo->cmd_urb);
581 uas_log_cmd_state(cmnd, "cmd submit err", err);
582 return SCSI_MLQUEUE_DEVICE_BUSY;
584 cmdinfo->cmd_urb = NULL;
585 cmdinfo->state &= ~SUBMIT_CMD_URB;
586 cmdinfo->state |= COMMAND_INFLIGHT;
592 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
593 void (*done)(struct scsi_cmnd *))
595 struct scsi_device *sdev = cmnd->device;
596 struct uas_dev_info *devinfo = sdev->hostdata;
597 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
601 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
603 /* Re-check scsi_block_requests now that we've the host-lock */
604 if (cmnd->device->host->host_self_blocked)
605 return SCSI_MLQUEUE_DEVICE_BUSY;
607 if ((devinfo->flags & US_FL_NO_ATA_1X) &&
608 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
609 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
610 sizeof(usb_stor_sense_invalidCDB));
611 cmnd->result = SAM_STAT_CHECK_CONDITION;
612 cmnd->scsi_done(cmnd);
616 spin_lock_irqsave(&devinfo->lock, flags);
618 if (devinfo->resetting) {
619 cmnd->result = DID_ERROR << 16;
620 cmnd->scsi_done(cmnd);
621 spin_unlock_irqrestore(&devinfo->lock, flags);
625 /* Find a free uas-tag */
626 for (idx = 0; idx < devinfo->qdepth; idx++) {
627 if (!devinfo->cmnd[idx])
630 if (idx == devinfo->qdepth) {
631 spin_unlock_irqrestore(&devinfo->lock, flags);
632 return SCSI_MLQUEUE_DEVICE_BUSY;
635 cmnd->scsi_done = done;
637 memset(cmdinfo, 0, sizeof(*cmdinfo));
638 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
639 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
641 switch (cmnd->sc_data_direction) {
642 case DMA_FROM_DEVICE:
643 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
645 case DMA_BIDIRECTIONAL:
646 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
648 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
653 if (!devinfo->use_streams)
654 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
656 err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
658 /* If we did nothing, give up now */
659 if (cmdinfo->state & SUBMIT_STATUS_URB) {
660 spin_unlock_irqrestore(&devinfo->lock, flags);
661 return SCSI_MLQUEUE_DEVICE_BUSY;
663 uas_add_work(cmdinfo);
666 devinfo->cmnd[idx] = cmnd;
667 spin_unlock_irqrestore(&devinfo->lock, flags);
671 static DEF_SCSI_QCMD(uas_queuecommand)
674 * For now we do not support actually sending an abort to the device, so
675 * this eh always fails. Still we must define it to make sure that we've
676 * dropped all references to the cmnd in question once this function exits.
678 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
680 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
681 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
682 struct urb *data_in_urb = NULL;
683 struct urb *data_out_urb = NULL;
686 spin_lock_irqsave(&devinfo->lock, flags);
688 uas_log_cmd_state(cmnd, __func__, 0);
690 /* Ensure that try_complete does not call scsi_done */
691 cmdinfo->state |= COMMAND_ABORTED;
693 /* Drop all refs to this cmnd, kill data urbs to break their ref */
694 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
695 if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
696 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
697 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
698 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
700 uas_free_unsubmitted_urbs(cmnd);
702 spin_unlock_irqrestore(&devinfo->lock, flags);
705 usb_kill_urb(data_in_urb);
706 usb_put_urb(data_in_urb);
709 usb_kill_urb(data_out_urb);
710 usb_put_urb(data_out_urb);
716 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
718 struct scsi_device *sdev = cmnd->device;
719 struct uas_dev_info *devinfo = sdev->hostdata;
720 struct usb_device *udev = devinfo->udev;
724 err = usb_lock_device_for_reset(udev, devinfo->intf);
726 shost_printk(KERN_ERR, sdev->host,
727 "%s FAILED to get lock err %d\n", __func__, err);
731 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
733 spin_lock_irqsave(&devinfo->lock, flags);
734 devinfo->resetting = 1;
735 spin_unlock_irqrestore(&devinfo->lock, flags);
737 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
738 usb_kill_anchored_urbs(&devinfo->sense_urbs);
739 usb_kill_anchored_urbs(&devinfo->data_urbs);
740 uas_zap_pending(devinfo, DID_RESET);
742 err = usb_reset_device(udev);
744 spin_lock_irqsave(&devinfo->lock, flags);
745 devinfo->resetting = 0;
746 spin_unlock_irqrestore(&devinfo->lock, flags);
748 usb_unlock_device(udev);
751 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
756 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
760 static int uas_target_alloc(struct scsi_target *starget)
762 struct uas_dev_info *devinfo = (struct uas_dev_info *)
763 dev_to_shost(starget->dev.parent)->hostdata;
765 if (devinfo->flags & US_FL_NO_REPORT_LUNS)
766 starget->no_report_luns = 1;
771 static int uas_slave_alloc(struct scsi_device *sdev)
773 struct uas_dev_info *devinfo =
774 (struct uas_dev_info *)sdev->host->hostdata;
776 sdev->hostdata = devinfo;
778 /* USB has unusual DMA-alignment requirements: Although the
779 * starting address of each scatter-gather element doesn't matter,
780 * the length of each element except the last must be divisible
781 * by the Bulk maxpacket value. There's currently no way to
782 * express this by block-layer constraints, so we'll cop out
783 * and simply require addresses to be aligned at 512-byte
784 * boundaries. This is okay since most block I/O involves
785 * hardware sectors that are multiples of 512 bytes in length,
786 * and since host controllers up through USB 2.0 have maxpacket
787 * values no larger than 512.
789 * But it doesn't suffice for Wireless USB, where Bulk maxpacket
790 * values can be as large as 2048. To make that work properly
791 * will require changes to the block layer.
793 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
795 if (devinfo->flags & US_FL_MAX_SECTORS_64)
796 blk_queue_max_hw_sectors(sdev->request_queue, 64);
797 else if (devinfo->flags & US_FL_MAX_SECTORS_240)
798 blk_queue_max_hw_sectors(sdev->request_queue, 240);
803 static int uas_slave_configure(struct scsi_device *sdev)
805 struct uas_dev_info *devinfo = sdev->hostdata;
807 if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
808 sdev->no_report_opcodes = 1;
810 /* A few buggy USB-ATA bridges don't understand FUA */
811 if (devinfo->flags & US_FL_BROKEN_FUA)
812 sdev->broken_fua = 1;
814 scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
818 static struct scsi_host_template uas_host_template = {
819 .module = THIS_MODULE,
821 .queuecommand = uas_queuecommand,
822 .target_alloc = uas_target_alloc,
823 .slave_alloc = uas_slave_alloc,
824 .slave_configure = uas_slave_configure,
825 .eh_abort_handler = uas_eh_abort_handler,
826 .eh_bus_reset_handler = uas_eh_bus_reset_handler,
827 .can_queue = MAX_CMNDS,
829 .sg_tablesize = SG_NONE,
830 .skip_settle_delay = 1,
833 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
834 vendorName, productName, useProtocol, useTransport, \
835 initFunction, flags) \
836 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
837 .driver_info = (flags) }
839 static struct usb_device_id uas_usb_ids[] = {
840 # include "unusual_uas.h"
841 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
842 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
845 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
849 static int uas_switch_interface(struct usb_device *udev,
850 struct usb_interface *intf)
854 alt = uas_find_uas_alt_setting(intf);
858 return usb_set_interface(udev,
859 intf->altsetting[0].desc.bInterfaceNumber, alt);
862 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
864 struct usb_host_endpoint *eps[4] = { };
865 struct usb_device *udev = devinfo->udev;
868 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
872 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
873 usb_endpoint_num(&eps[0]->desc));
874 devinfo->status_pipe = usb_rcvbulkpipe(udev,
875 usb_endpoint_num(&eps[1]->desc));
876 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
877 usb_endpoint_num(&eps[2]->desc));
878 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
879 usb_endpoint_num(&eps[3]->desc));
881 if (udev->speed < USB_SPEED_SUPER) {
882 devinfo->qdepth = 32;
883 devinfo->use_streams = 0;
885 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
886 3, MAX_CMNDS, GFP_NOIO);
887 if (devinfo->qdepth < 0)
888 return devinfo->qdepth;
889 devinfo->use_streams = 1;
895 static void uas_free_streams(struct uas_dev_info *devinfo)
897 struct usb_device *udev = devinfo->udev;
898 struct usb_host_endpoint *eps[3];
900 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
901 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
902 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
903 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
906 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
908 int result = -ENOMEM;
909 struct Scsi_Host *shost = NULL;
910 struct uas_dev_info *devinfo;
911 struct usb_device *udev = interface_to_usbdev(intf);
912 unsigned long dev_flags;
914 if (!uas_use_uas_driver(intf, id, &dev_flags))
917 if (uas_switch_interface(udev, intf))
920 shost = scsi_host_alloc(&uas_host_template,
921 sizeof(struct uas_dev_info));
925 shost->max_cmd_len = 16 + 252;
927 shost->max_lun = 256;
928 shost->max_channel = 0;
929 shost->sg_tablesize = udev->bus->sg_tablesize;
931 devinfo = (struct uas_dev_info *)shost->hostdata;
932 devinfo->intf = intf;
933 devinfo->udev = udev;
934 devinfo->resetting = 0;
935 devinfo->shutdown = 0;
936 devinfo->flags = dev_flags;
937 init_usb_anchor(&devinfo->cmd_urbs);
938 init_usb_anchor(&devinfo->sense_urbs);
939 init_usb_anchor(&devinfo->data_urbs);
940 spin_lock_init(&devinfo->lock);
941 INIT_WORK(&devinfo->work, uas_do_work);
943 result = uas_configure_endpoints(devinfo);
948 * 1 tag is reserved for untagged commands +
949 * 1 tag to avoid off by one errors in some bridge firmwares
951 shost->can_queue = devinfo->qdepth - 2;
953 usb_set_intfdata(intf, shost);
954 result = scsi_add_host(shost, &intf->dev);
958 scsi_scan_host(shost);
962 uas_free_streams(devinfo);
963 usb_set_intfdata(intf, NULL);
965 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
967 scsi_host_put(shost);
971 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
976 spin_lock_irqsave(&devinfo->lock, flags);
978 for (i = 0; i < devinfo->qdepth; i++) {
979 if (devinfo->cmnd[i]) {
980 r = 0; /* Not empty */
985 spin_unlock_irqrestore(&devinfo->lock, flags);
991 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
992 * get empty while there still is more work to do due to sense-urbs completing
993 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
995 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
997 unsigned long start_time;
1000 start_time = jiffies;
1002 flush_work(&devinfo->work);
1004 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1008 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1012 if (time_after(jiffies, start_time + 5 * HZ))
1014 } while (!uas_cmnd_list_empty(devinfo));
1019 static int uas_pre_reset(struct usb_interface *intf)
1021 struct Scsi_Host *shost = usb_get_intfdata(intf);
1022 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1023 unsigned long flags;
1025 if (devinfo->shutdown)
1028 /* Block new requests */
1029 spin_lock_irqsave(shost->host_lock, flags);
1030 scsi_block_requests(shost);
1031 spin_unlock_irqrestore(shost->host_lock, flags);
1033 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1034 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1035 scsi_unblock_requests(shost);
1039 uas_free_streams(devinfo);
1044 static int uas_post_reset(struct usb_interface *intf)
1046 struct Scsi_Host *shost = usb_get_intfdata(intf);
1047 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1048 unsigned long flags;
1051 if (devinfo->shutdown)
1054 err = uas_configure_endpoints(devinfo);
1056 shost_printk(KERN_ERR, shost,
1057 "%s: alloc streams error %d after reset",
1062 spin_lock_irqsave(shost->host_lock, flags);
1063 scsi_report_bus_reset(shost, 0);
1064 spin_unlock_irqrestore(shost->host_lock, flags);
1066 scsi_unblock_requests(shost);
1071 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1073 struct Scsi_Host *shost = usb_get_intfdata(intf);
1074 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1076 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1077 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1084 static int uas_resume(struct usb_interface *intf)
1089 static int uas_reset_resume(struct usb_interface *intf)
1091 struct Scsi_Host *shost = usb_get_intfdata(intf);
1092 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1093 unsigned long flags;
1096 err = uas_configure_endpoints(devinfo);
1098 shost_printk(KERN_ERR, shost,
1099 "%s: alloc streams error %d after reset",
1104 spin_lock_irqsave(shost->host_lock, flags);
1105 scsi_report_bus_reset(shost, 0);
1106 spin_unlock_irqrestore(shost->host_lock, flags);
1111 static void uas_disconnect(struct usb_interface *intf)
1113 struct Scsi_Host *shost = usb_get_intfdata(intf);
1114 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1115 unsigned long flags;
1117 spin_lock_irqsave(&devinfo->lock, flags);
1118 devinfo->resetting = 1;
1119 spin_unlock_irqrestore(&devinfo->lock, flags);
1121 cancel_work_sync(&devinfo->work);
1122 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1123 usb_kill_anchored_urbs(&devinfo->sense_urbs);
1124 usb_kill_anchored_urbs(&devinfo->data_urbs);
1125 uas_zap_pending(devinfo, DID_NO_CONNECT);
1127 scsi_remove_host(shost);
1128 uas_free_streams(devinfo);
1129 scsi_host_put(shost);
1133 * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1134 * hang on reboot when the device is still in uas mode. Note the reset is
1135 * necessary as some devices won't revert to usb-storage mode without it.
1137 static void uas_shutdown(struct device *dev)
1139 struct usb_interface *intf = to_usb_interface(dev);
1140 struct usb_device *udev = interface_to_usbdev(intf);
1141 struct Scsi_Host *shost = usb_get_intfdata(intf);
1142 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1144 if (system_state != SYSTEM_RESTART)
1147 devinfo->shutdown = 1;
1148 uas_free_streams(devinfo);
1149 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1150 usb_reset_device(udev);
1153 static struct usb_driver uas_driver = {
1156 .disconnect = uas_disconnect,
1157 .pre_reset = uas_pre_reset,
1158 .post_reset = uas_post_reset,
1159 .suspend = uas_suspend,
1160 .resume = uas_resume,
1161 .reset_resume = uas_reset_resume,
1162 .drvwrap.driver.shutdown = uas_shutdown,
1163 .id_table = uas_usb_ids,
1166 module_usb_driver(uas_driver);
1168 MODULE_LICENSE("GPL");
1170 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");