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Linux/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 Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2016
  6  * Copyright Matthew Wilcox for Intel Corp, 2010
  7  * Copyright Sarah Sharp for Intel Corp, 2010
  8  *
  9  * Distributed under the terms of the GNU GPL, version two.
 10  */
 11 
 12 #include <linux/blkdev.h>
 13 #include <linux/slab.h>
 14 #include <linux/types.h>
 15 #include <linux/module.h>
 16 #include <linux/usb.h>
 17 #include <linux/usb_usual.h>
 18 #include <linux/usb/hcd.h>
 19 #include <linux/usb/storage.h>
 20 #include <linux/usb/uas.h>
 21 
 22 #include <scsi/scsi.h>
 23 #include <scsi/scsi_eh.h>
 24 #include <scsi/scsi_dbg.h>
 25 #include <scsi/scsi_cmnd.h>
 26 #include <scsi/scsi_device.h>
 27 #include <scsi/scsi_host.h>
 28 #include <scsi/scsi_tcq.h>
 29 
 30 #include "uas-detect.h"
 31 #include "scsiglue.h"
 32 
 33 #define MAX_CMNDS 256
 34 
 35 struct uas_dev_info {
 36         struct usb_interface *intf;
 37         struct usb_device *udev;
 38         struct usb_anchor cmd_urbs;
 39         struct usb_anchor sense_urbs;
 40         struct usb_anchor data_urbs;
 41         unsigned long flags;
 42         int qdepth, resetting;
 43         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
 44         unsigned use_streams:1;
 45         unsigned shutdown:1;
 46         struct scsi_cmnd *cmnd[MAX_CMNDS];
 47         spinlock_t lock;
 48         struct work_struct work;
 49 };
 50 
 51 enum {
 52         SUBMIT_STATUS_URB       = BIT(1),
 53         ALLOC_DATA_IN_URB       = BIT(2),
 54         SUBMIT_DATA_IN_URB      = BIT(3),
 55         ALLOC_DATA_OUT_URB      = BIT(4),
 56         SUBMIT_DATA_OUT_URB     = BIT(5),
 57         ALLOC_CMD_URB           = BIT(6),
 58         SUBMIT_CMD_URB          = BIT(7),
 59         COMMAND_INFLIGHT        = BIT(8),
 60         DATA_IN_URB_INFLIGHT    = BIT(9),
 61         DATA_OUT_URB_INFLIGHT   = BIT(10),
 62         COMMAND_ABORTED         = BIT(11),
 63         IS_IN_WORK_LIST         = BIT(12),
 64 };
 65 
 66 /* Overrides scsi_pointer */
 67 struct uas_cmd_info {
 68         unsigned int state;
 69         unsigned int uas_tag;
 70         struct urb *cmd_urb;
 71         struct urb *data_in_urb;
 72         struct urb *data_out_urb;
 73 };
 74 
 75 /* I hate forward declarations, but I actually have a loop */
 76 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 77                                 struct uas_dev_info *devinfo);
 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,
 82                                 int status);
 83 
 84 static void uas_do_work(struct work_struct *work)
 85 {
 86         struct uas_dev_info *devinfo =
 87                 container_of(work, struct uas_dev_info, work);
 88         struct uas_cmd_info *cmdinfo;
 89         struct scsi_cmnd *cmnd;
 90         unsigned long flags;
 91         int i, err;
 92 
 93         spin_lock_irqsave(&devinfo->lock, flags);
 94 
 95         if (devinfo->resetting)
 96                 goto out;
 97 
 98         for (i = 0; i < devinfo->qdepth; i++) {
 99                 if (!devinfo->cmnd[i])
100                         continue;
101 
102                 cmnd = devinfo->cmnd[i];
103                 cmdinfo = (void *)&cmnd->SCp;
104 
105                 if (!(cmdinfo->state & IS_IN_WORK_LIST))
106                         continue;
107 
108                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
109                 if (!err)
110                         cmdinfo->state &= ~IS_IN_WORK_LIST;
111                 else
112                         schedule_work(&devinfo->work);
113         }
114 out:
115         spin_unlock_irqrestore(&devinfo->lock, flags);
116 }
117 
118 static void uas_add_work(struct uas_cmd_info *cmdinfo)
119 {
120         struct scsi_pointer *scp = (void *)cmdinfo;
121         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
122         struct uas_dev_info *devinfo = cmnd->device->hostdata;
123 
124         lockdep_assert_held(&devinfo->lock);
125         cmdinfo->state |= IS_IN_WORK_LIST;
126         schedule_work(&devinfo->work);
127 }
128 
129 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
130 {
131         struct uas_cmd_info *cmdinfo;
132         struct scsi_cmnd *cmnd;
133         unsigned long flags;
134         int i, err;
135 
136         spin_lock_irqsave(&devinfo->lock, flags);
137         for (i = 0; i < devinfo->qdepth; i++) {
138                 if (!devinfo->cmnd[i])
139                         continue;
140 
141                 cmnd = devinfo->cmnd[i];
142                 cmdinfo = (void *)&cmnd->SCp;
143                 uas_log_cmd_state(cmnd, __func__, 0);
144                 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
145                 cmdinfo->state &= ~COMMAND_INFLIGHT;
146                 cmnd->result = result << 16;
147                 err = uas_try_complete(cmnd, __func__);
148                 WARN_ON(err != 0);
149         }
150         spin_unlock_irqrestore(&devinfo->lock, flags);
151 }
152 
153 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
154 {
155         struct sense_iu *sense_iu = urb->transfer_buffer;
156         struct scsi_device *sdev = cmnd->device;
157 
158         if (urb->actual_length > 16) {
159                 unsigned len = be16_to_cpup(&sense_iu->len);
160                 if (len + 16 != urb->actual_length) {
161                         int newlen = min(len + 16, urb->actual_length) - 16;
162                         if (newlen < 0)
163                                 newlen = 0;
164                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
165                                 "disagrees with IU sense data length %d, "
166                                 "using %d bytes of sense data\n", __func__,
167                                         urb->actual_length, len, newlen);
168                         len = newlen;
169                 }
170                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
171         }
172 
173         cmnd->result = sense_iu->status;
174 }
175 
176 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
177                               int status)
178 {
179         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
180         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
181 
182         scmd_printk(KERN_INFO, cmnd,
183                     "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
184                     prefix, status, cmdinfo->uas_tag,
185                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
186                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
187                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
188                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
189                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
190                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
191                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
192                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
193                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
194                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
195                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
196                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
197         scsi_print_command(cmnd);
198 }
199 
200 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
201 {
202         struct uas_cmd_info *cmdinfo;
203 
204         if (!cmnd)
205                 return;
206 
207         cmdinfo = (void *)&cmnd->SCp;
208 
209         if (cmdinfo->state & SUBMIT_CMD_URB)
210                 usb_free_urb(cmdinfo->cmd_urb);
211 
212         /* data urbs may have never gotten their submit flag set */
213         if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
214                 usb_free_urb(cmdinfo->data_in_urb);
215         if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
216                 usb_free_urb(cmdinfo->data_out_urb);
217 }
218 
219 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
220 {
221         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
222         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
223 
224         lockdep_assert_held(&devinfo->lock);
225         if (cmdinfo->state & (COMMAND_INFLIGHT |
226                               DATA_IN_URB_INFLIGHT |
227                               DATA_OUT_URB_INFLIGHT |
228                               COMMAND_ABORTED))
229                 return -EBUSY;
230         devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
231         uas_free_unsubmitted_urbs(cmnd);
232         cmnd->scsi_done(cmnd);
233         return 0;
234 }
235 
236 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
237                           unsigned direction)
238 {
239         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
240         int err;
241 
242         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
243         err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
244         if (err) {
245                 uas_add_work(cmdinfo);
246         }
247 }
248 
249 static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
250 {
251         u8 response_code = riu->response_code;
252 
253         switch (response_code) {
254         case RC_INCORRECT_LUN:
255                 cmnd->result = DID_BAD_TARGET << 16;
256                 break;
257         case RC_TMF_SUCCEEDED:
258                 cmnd->result = DID_OK << 16;
259                 break;
260         case RC_TMF_NOT_SUPPORTED:
261                 cmnd->result = DID_TARGET_FAILURE << 16;
262                 break;
263         default:
264                 uas_log_cmd_state(cmnd, "response iu", response_code);
265                 cmnd->result = DID_ERROR << 16;
266                 break;
267         }
268 
269         return response_code == RC_TMF_SUCCEEDED;
270 }
271 
272 static void uas_stat_cmplt(struct urb *urb)
273 {
274         struct iu *iu = urb->transfer_buffer;
275         struct Scsi_Host *shost = urb->context;
276         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
277         struct urb *data_in_urb = NULL;
278         struct urb *data_out_urb = NULL;
279         struct scsi_cmnd *cmnd;
280         struct uas_cmd_info *cmdinfo;
281         unsigned long flags;
282         unsigned int idx;
283         int status = urb->status;
284         bool success;
285 
286         spin_lock_irqsave(&devinfo->lock, flags);
287 
288         if (devinfo->resetting)
289                 goto out;
290 
291         if (status) {
292                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
293                         dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
294                 goto out;
295         }
296 
297         idx = be16_to_cpup(&iu->tag) - 1;
298         if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
299                 dev_err(&urb->dev->dev,
300                         "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
301                 goto out;
302         }
303 
304         cmnd = devinfo->cmnd[idx];
305         cmdinfo = (void *)&cmnd->SCp;
306 
307         if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
308                 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
309                 goto out;
310         }
311 
312         switch (iu->iu_id) {
313         case IU_ID_STATUS:
314                 uas_sense(urb, cmnd);
315                 if (cmnd->result != 0) {
316                         /* cancel data transfers on error */
317                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
318                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
319                 }
320                 cmdinfo->state &= ~COMMAND_INFLIGHT;
321                 uas_try_complete(cmnd, __func__);
322                 break;
323         case IU_ID_READ_READY:
324                 if (!cmdinfo->data_in_urb ||
325                                 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
326                         uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
327                         break;
328                 }
329                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
330                 break;
331         case IU_ID_WRITE_READY:
332                 if (!cmdinfo->data_out_urb ||
333                                 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
334                         uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
335                         break;
336                 }
337                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
338                 break;
339         case IU_ID_RESPONSE:
340                 cmdinfo->state &= ~COMMAND_INFLIGHT;
341                 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
342                 if (!success) {
343                         /* Error, cancel data transfers */
344                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
345                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
346                 }
347                 uas_try_complete(cmnd, __func__);
348                 break;
349         default:
350                 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
351         }
352 out:
353         usb_free_urb(urb);
354         spin_unlock_irqrestore(&devinfo->lock, flags);
355 
356         /* Unlinking of data urbs must be done without holding the lock */
357         if (data_in_urb) {
358                 usb_unlink_urb(data_in_urb);
359                 usb_put_urb(data_in_urb);
360         }
361         if (data_out_urb) {
362                 usb_unlink_urb(data_out_urb);
363                 usb_put_urb(data_out_urb);
364         }
365 }
366 
367 static void uas_data_cmplt(struct urb *urb)
368 {
369         struct scsi_cmnd *cmnd = urb->context;
370         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
371         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
372         struct scsi_data_buffer *sdb = NULL;
373         unsigned long flags;
374         int status = urb->status;
375 
376         spin_lock_irqsave(&devinfo->lock, flags);
377 
378         if (cmdinfo->data_in_urb == urb) {
379                 sdb = scsi_in(cmnd);
380                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
381                 cmdinfo->data_in_urb = NULL;
382         } else if (cmdinfo->data_out_urb == urb) {
383                 sdb = scsi_out(cmnd);
384                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
385                 cmdinfo->data_out_urb = NULL;
386         }
387         if (sdb == NULL) {
388                 WARN_ON_ONCE(1);
389                 goto out;
390         }
391 
392         if (devinfo->resetting)
393                 goto out;
394 
395         /* Data urbs should not complete before the cmd urb is submitted */
396         if (cmdinfo->state & SUBMIT_CMD_URB) {
397                 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
398                 goto out;
399         }
400 
401         if (status) {
402                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
403                         uas_log_cmd_state(cmnd, "data cmplt err", status);
404                 /* error: no data transfered */
405                 sdb->resid = sdb->length;
406         } else {
407                 sdb->resid = sdb->length - urb->actual_length;
408         }
409         uas_try_complete(cmnd, __func__);
410 out:
411         usb_free_urb(urb);
412         spin_unlock_irqrestore(&devinfo->lock, flags);
413 }
414 
415 static void uas_cmd_cmplt(struct urb *urb)
416 {
417         if (urb->status)
418                 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
419 
420         usb_free_urb(urb);
421 }
422 
423 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
424                                       struct scsi_cmnd *cmnd,
425                                       enum dma_data_direction dir)
426 {
427         struct usb_device *udev = devinfo->udev;
428         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
429         struct urb *urb = usb_alloc_urb(0, gfp);
430         struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
431                 ? scsi_in(cmnd) : scsi_out(cmnd);
432         unsigned int pipe = (dir == DMA_FROM_DEVICE)
433                 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
434 
435         if (!urb)
436                 goto out;
437         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
438                           uas_data_cmplt, cmnd);
439         if (devinfo->use_streams)
440                 urb->stream_id = cmdinfo->uas_tag;
441         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
442         urb->sg = sdb->table.sgl;
443  out:
444         return urb;
445 }
446 
447 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
448                                        struct scsi_cmnd *cmnd)
449 {
450         struct usb_device *udev = devinfo->udev;
451         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
452         struct urb *urb = usb_alloc_urb(0, gfp);
453         struct sense_iu *iu;
454 
455         if (!urb)
456                 goto out;
457 
458         iu = kzalloc(sizeof(*iu), gfp);
459         if (!iu)
460                 goto free;
461 
462         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
463                           uas_stat_cmplt, cmnd->device->host);
464         if (devinfo->use_streams)
465                 urb->stream_id = cmdinfo->uas_tag;
466         urb->transfer_flags |= URB_FREE_BUFFER;
467  out:
468         return urb;
469  free:
470         usb_free_urb(urb);
471         return NULL;
472 }
473 
474 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
475                                         struct scsi_cmnd *cmnd)
476 {
477         struct usb_device *udev = devinfo->udev;
478         struct scsi_device *sdev = cmnd->device;
479         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
480         struct urb *urb = usb_alloc_urb(0, gfp);
481         struct command_iu *iu;
482         int len;
483 
484         if (!urb)
485                 goto out;
486 
487         len = cmnd->cmd_len - 16;
488         if (len < 0)
489                 len = 0;
490         len = ALIGN(len, 4);
491         iu = kzalloc(sizeof(*iu) + len, gfp);
492         if (!iu)
493                 goto free;
494 
495         iu->iu_id = IU_ID_COMMAND;
496         iu->tag = cpu_to_be16(cmdinfo->uas_tag);
497         iu->prio_attr = UAS_SIMPLE_TAG;
498         iu->len = len;
499         int_to_scsilun(sdev->lun, &iu->lun);
500         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
501 
502         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
503                                                         uas_cmd_cmplt, NULL);
504         urb->transfer_flags |= URB_FREE_BUFFER;
505  out:
506         return urb;
507  free:
508         usb_free_urb(urb);
509         return NULL;
510 }
511 
512 /*
513  * Why should I request the Status IU before sending the Command IU?  Spec
514  * says to, but also says the device may receive them in any order.  Seems
515  * daft to me.
516  */
517 
518 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
519 {
520         struct uas_dev_info *devinfo = cmnd->device->hostdata;
521         struct urb *urb;
522         int err;
523 
524         urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
525         if (!urb)
526                 return NULL;
527         usb_anchor_urb(urb, &devinfo->sense_urbs);
528         err = usb_submit_urb(urb, gfp);
529         if (err) {
530                 usb_unanchor_urb(urb);
531                 uas_log_cmd_state(cmnd, "sense submit err", err);
532                 usb_free_urb(urb);
533                 return NULL;
534         }
535         return urb;
536 }
537 
538 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
539                            struct uas_dev_info *devinfo)
540 {
541         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
542         struct urb *urb;
543         int err;
544 
545         lockdep_assert_held(&devinfo->lock);
546         if (cmdinfo->state & SUBMIT_STATUS_URB) {
547                 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
548                 if (!urb)
549                         return SCSI_MLQUEUE_DEVICE_BUSY;
550                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
551         }
552 
553         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
554                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
555                                                         cmnd, DMA_FROM_DEVICE);
556                 if (!cmdinfo->data_in_urb)
557                         return SCSI_MLQUEUE_DEVICE_BUSY;
558                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
559         }
560 
561         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
562                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
563                 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
564                 if (err) {
565                         usb_unanchor_urb(cmdinfo->data_in_urb);
566                         uas_log_cmd_state(cmnd, "data in submit err", err);
567                         return SCSI_MLQUEUE_DEVICE_BUSY;
568                 }
569                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
570                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
571         }
572 
573         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
574                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
575                                                         cmnd, DMA_TO_DEVICE);
576                 if (!cmdinfo->data_out_urb)
577                         return SCSI_MLQUEUE_DEVICE_BUSY;
578                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
579         }
580 
581         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
582                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
583                 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
584                 if (err) {
585                         usb_unanchor_urb(cmdinfo->data_out_urb);
586                         uas_log_cmd_state(cmnd, "data out submit err", err);
587                         return SCSI_MLQUEUE_DEVICE_BUSY;
588                 }
589                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
590                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
591         }
592 
593         if (cmdinfo->state & ALLOC_CMD_URB) {
594                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
595                 if (!cmdinfo->cmd_urb)
596                         return SCSI_MLQUEUE_DEVICE_BUSY;
597                 cmdinfo->state &= ~ALLOC_CMD_URB;
598         }
599 
600         if (cmdinfo->state & SUBMIT_CMD_URB) {
601                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
602                 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
603                 if (err) {
604                         usb_unanchor_urb(cmdinfo->cmd_urb);
605                         uas_log_cmd_state(cmnd, "cmd submit err", err);
606                         return SCSI_MLQUEUE_DEVICE_BUSY;
607                 }
608                 cmdinfo->cmd_urb = NULL;
609                 cmdinfo->state &= ~SUBMIT_CMD_URB;
610                 cmdinfo->state |= COMMAND_INFLIGHT;
611         }
612 
613         return 0;
614 }
615 
616 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
617                                         void (*done)(struct scsi_cmnd *))
618 {
619         struct scsi_device *sdev = cmnd->device;
620         struct uas_dev_info *devinfo = sdev->hostdata;
621         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
622         unsigned long flags;
623         int idx, err;
624 
625         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
626 
627         /* Re-check scsi_block_requests now that we've the host-lock */
628         if (cmnd->device->host->host_self_blocked)
629                 return SCSI_MLQUEUE_DEVICE_BUSY;
630 
631         if ((devinfo->flags & US_FL_NO_ATA_1X) &&
632                         (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
633                 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
634                        sizeof(usb_stor_sense_invalidCDB));
635                 cmnd->result = SAM_STAT_CHECK_CONDITION;
636                 cmnd->scsi_done(cmnd);
637                 return 0;
638         }
639 
640         spin_lock_irqsave(&devinfo->lock, flags);
641 
642         if (devinfo->resetting) {
643                 cmnd->result = DID_ERROR << 16;
644                 cmnd->scsi_done(cmnd);
645                 spin_unlock_irqrestore(&devinfo->lock, flags);
646                 return 0;
647         }
648 
649         /* Find a free uas-tag */
650         for (idx = 0; idx < devinfo->qdepth; idx++) {
651                 if (!devinfo->cmnd[idx])
652                         break;
653         }
654         if (idx == devinfo->qdepth) {
655                 spin_unlock_irqrestore(&devinfo->lock, flags);
656                 return SCSI_MLQUEUE_DEVICE_BUSY;
657         }
658 
659         cmnd->scsi_done = done;
660 
661         memset(cmdinfo, 0, sizeof(*cmdinfo));
662         cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
663         cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
664 
665         switch (cmnd->sc_data_direction) {
666         case DMA_FROM_DEVICE:
667                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
668                 break;
669         case DMA_BIDIRECTIONAL:
670                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
671         case DMA_TO_DEVICE:
672                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
673         case DMA_NONE:
674                 break;
675         }
676 
677         if (!devinfo->use_streams)
678                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
679 
680         err = uas_submit_urbs(cmnd, devinfo);
681         if (err) {
682                 /* If we did nothing, give up now */
683                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
684                         spin_unlock_irqrestore(&devinfo->lock, flags);
685                         return SCSI_MLQUEUE_DEVICE_BUSY;
686                 }
687                 uas_add_work(cmdinfo);
688         }
689 
690         devinfo->cmnd[idx] = cmnd;
691         spin_unlock_irqrestore(&devinfo->lock, flags);
692         return 0;
693 }
694 
695 static 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  */
702 static 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 
740 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
741 {
742         struct scsi_device *sdev = cmnd->device;
743         struct uas_dev_info *devinfo = sdev->hostdata;
744         struct usb_device *udev = devinfo->udev;
745         unsigned long flags;
746         int err;
747 
748         err = usb_lock_device_for_reset(udev, devinfo->intf);
749         if (err) {
750                 shost_printk(KERN_ERR, sdev->host,
751                              "%s FAILED to get lock err %d\n", __func__, err);
752                 return FAILED;
753         }
754 
755         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
756 
757         spin_lock_irqsave(&devinfo->lock, flags);
758         devinfo->resetting = 1;
759         spin_unlock_irqrestore(&devinfo->lock, flags);
760 
761         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
762         usb_kill_anchored_urbs(&devinfo->sense_urbs);
763         usb_kill_anchored_urbs(&devinfo->data_urbs);
764         uas_zap_pending(devinfo, DID_RESET);
765 
766         err = usb_reset_device(udev);
767 
768         spin_lock_irqsave(&devinfo->lock, flags);
769         devinfo->resetting = 0;
770         spin_unlock_irqrestore(&devinfo->lock, flags);
771 
772         usb_unlock_device(udev);
773 
774         if (err) {
775                 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
776                              __func__, err);
777                 return FAILED;
778         }
779 
780         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
781         return SUCCESS;
782 }
783 
784 static 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 
795 static int uas_slave_alloc(struct scsi_device *sdev)
796 {
797         struct uas_dev_info *devinfo =
798                 (struct uas_dev_info *)sdev->host->hostdata;
799 
800         sdev->hostdata = devinfo;
801 
802         /* USB has unusual DMA-alignment requirements: Although the
803          * starting address of each scatter-gather element doesn't matter,
804          * the length of each element except the last must be divisible
805          * by the Bulk maxpacket value.  There's currently no way to
806          * express this by block-layer constraints, so we'll cop out
807          * and simply require addresses to be aligned at 512-byte
808          * boundaries.  This is okay since most block I/O involves
809          * hardware sectors that are multiples of 512 bytes in length,
810          * and since host controllers up through USB 2.0 have maxpacket
811          * values no larger than 512.
812          *
813          * But it doesn't suffice for Wireless USB, where Bulk maxpacket
814          * values can be as large as 2048.  To make that work properly
815          * will require changes to the block layer.
816          */
817         blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
818 
819         if (devinfo->flags & US_FL_MAX_SECTORS_64)
820                 blk_queue_max_hw_sectors(sdev->request_queue, 64);
821         else if (devinfo->flags & US_FL_MAX_SECTORS_240)
822                 blk_queue_max_hw_sectors(sdev->request_queue, 240);
823 
824         return 0;
825 }
826 
827 static int uas_slave_configure(struct scsi_device *sdev)
828 {
829         struct uas_dev_info *devinfo = sdev->hostdata;
830 
831         if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
832                 sdev->no_report_opcodes = 1;
833 
834         /* A few buggy USB-ATA bridges don't understand FUA */
835         if (devinfo->flags & US_FL_BROKEN_FUA)
836                 sdev->broken_fua = 1;
837 
838         return 0;
839 }
840 
841 static struct scsi_host_template uas_host_template = {
842         .module = THIS_MODULE,
843         .name = "uas",
844         .queuecommand = uas_queuecommand,
845         .target_alloc = uas_target_alloc,
846         .slave_alloc = uas_slave_alloc,
847         .slave_configure = uas_slave_configure,
848         .eh_abort_handler = uas_eh_abort_handler,
849         .eh_bus_reset_handler = uas_eh_bus_reset_handler,
850         .can_queue = MAX_CMNDS,
851         .this_id = -1,
852         .sg_tablesize = SG_NONE,
853         .skip_settle_delay = 1,
854 };
855 
856 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
857                     vendorName, productName, useProtocol, useTransport, \
858                     initFunction, flags) \
859 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
860         .driver_info = (flags) }
861 
862 static struct usb_device_id uas_usb_ids[] = {
863 #       include "unusual_uas.h"
864         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
865         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
866         { }
867 };
868 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
869 
870 #undef UNUSUAL_DEV
871 
872 static int uas_switch_interface(struct usb_device *udev,
873                                 struct usb_interface *intf)
874 {
875         int alt;
876 
877         alt = uas_find_uas_alt_setting(intf);
878         if (alt < 0)
879                 return alt;
880 
881         return usb_set_interface(udev,
882                         intf->altsetting[0].desc.bInterfaceNumber, alt);
883 }
884 
885 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
886 {
887         struct usb_host_endpoint *eps[4] = { };
888         struct usb_device *udev = devinfo->udev;
889         int r;
890 
891         r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
892         if (r)
893                 return r;
894 
895         devinfo->cmd_pipe = usb_sndbulkpipe(udev,
896                                             usb_endpoint_num(&eps[0]->desc));
897         devinfo->status_pipe = usb_rcvbulkpipe(udev,
898                                             usb_endpoint_num(&eps[1]->desc));
899         devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
900                                             usb_endpoint_num(&eps[2]->desc));
901         devinfo->data_out_pipe = usb_sndbulkpipe(udev,
902                                             usb_endpoint_num(&eps[3]->desc));
903 
904         if (udev->speed < USB_SPEED_SUPER) {
905                 devinfo->qdepth = 32;
906                 devinfo->use_streams = 0;
907         } else {
908                 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
909                                                     3, MAX_CMNDS, GFP_NOIO);
910                 if (devinfo->qdepth < 0)
911                         return devinfo->qdepth;
912                 devinfo->use_streams = 1;
913         }
914 
915         return 0;
916 }
917 
918 static void uas_free_streams(struct uas_dev_info *devinfo)
919 {
920         struct usb_device *udev = devinfo->udev;
921         struct usb_host_endpoint *eps[3];
922 
923         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
924         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
925         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
926         usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
927 }
928 
929 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
930 {
931         int result = -ENOMEM;
932         struct Scsi_Host *shost = NULL;
933         struct uas_dev_info *devinfo;
934         struct usb_device *udev = interface_to_usbdev(intf);
935         unsigned long dev_flags;
936 
937         if (!uas_use_uas_driver(intf, id, &dev_flags))
938                 return -ENODEV;
939 
940         if (uas_switch_interface(udev, intf))
941                 return -ENODEV;
942 
943         shost = scsi_host_alloc(&uas_host_template,
944                                 sizeof(struct uas_dev_info));
945         if (!shost)
946                 goto set_alt0;
947 
948         shost->max_cmd_len = 16 + 252;
949         shost->max_id = 1;
950         shost->max_lun = 256;
951         shost->max_channel = 0;
952         shost->sg_tablesize = udev->bus->sg_tablesize;
953 
954         devinfo = (struct uas_dev_info *)shost->hostdata;
955         devinfo->intf = intf;
956         devinfo->udev = udev;
957         devinfo->resetting = 0;
958         devinfo->shutdown = 0;
959         devinfo->flags = dev_flags;
960         init_usb_anchor(&devinfo->cmd_urbs);
961         init_usb_anchor(&devinfo->sense_urbs);
962         init_usb_anchor(&devinfo->data_urbs);
963         spin_lock_init(&devinfo->lock);
964         INIT_WORK(&devinfo->work, uas_do_work);
965 
966         result = uas_configure_endpoints(devinfo);
967         if (result)
968                 goto set_alt0;
969 
970         /*
971          * 1 tag is reserved for untagged commands +
972          * 1 tag to avoid off by one errors in some bridge firmwares
973          */
974         shost->can_queue = devinfo->qdepth - 2;
975 
976         usb_set_intfdata(intf, shost);
977         result = scsi_add_host(shost, &intf->dev);
978         if (result)
979                 goto free_streams;
980 
981         scsi_scan_host(shost);
982         return result;
983 
984 free_streams:
985         uas_free_streams(devinfo);
986         usb_set_intfdata(intf, NULL);
987 set_alt0:
988         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
989         if (shost)
990                 scsi_host_put(shost);
991         return result;
992 }
993 
994 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
995 {
996         unsigned long flags;
997         int i, r = 1;
998 
999         spin_lock_irqsave(&devinfo->lock, flags);
1000 
1001         for (i = 0; i < devinfo->qdepth; i++) {
1002                 if (devinfo->cmnd[i]) {
1003                         r = 0; /* Not empty */
1004                         break;
1005                 }
1006         }
1007 
1008         spin_unlock_irqrestore(&devinfo->lock, flags);
1009 
1010         return r;
1011 }
1012 
1013 /*
1014  * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1015  * get empty while there still is more work to do due to sense-urbs completing
1016  * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1017  */
1018 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1019 {
1020         unsigned long start_time;
1021         int r;
1022 
1023         start_time = jiffies;
1024         do {
1025                 flush_work(&devinfo->work);
1026 
1027                 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1028                 if (r == 0)
1029                         return -ETIME;
1030 
1031                 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1032                 if (r == 0)
1033                         return -ETIME;
1034 
1035                 if (time_after(jiffies, start_time + 5 * HZ))
1036                         return -ETIME;
1037         } while (!uas_cmnd_list_empty(devinfo));
1038 
1039         return 0;
1040 }
1041 
1042 static int uas_pre_reset(struct usb_interface *intf)
1043 {
1044         struct Scsi_Host *shost = usb_get_intfdata(intf);
1045         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1046         unsigned long flags;
1047 
1048         if (devinfo->shutdown)
1049                 return 0;
1050 
1051         /* Block new requests */
1052         spin_lock_irqsave(shost->host_lock, flags);
1053         scsi_block_requests(shost);
1054         spin_unlock_irqrestore(shost->host_lock, flags);
1055 
1056         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1057                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1058                 scsi_unblock_requests(shost);
1059                 return 1;
1060         }
1061 
1062         uas_free_streams(devinfo);
1063 
1064         return 0;
1065 }
1066 
1067 static int uas_post_reset(struct usb_interface *intf)
1068 {
1069         struct Scsi_Host *shost = usb_get_intfdata(intf);
1070         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1071         unsigned long flags;
1072         int err;
1073 
1074         if (devinfo->shutdown)
1075                 return 0;
1076 
1077         err = uas_configure_endpoints(devinfo);
1078         if (err) {
1079                 shost_printk(KERN_ERR, shost,
1080                              "%s: alloc streams error %d after reset",
1081                              __func__, err);
1082                 return 1;
1083         }
1084 
1085         spin_lock_irqsave(shost->host_lock, flags);
1086         scsi_report_bus_reset(shost, 0);
1087         spin_unlock_irqrestore(shost->host_lock, flags);
1088 
1089         scsi_unblock_requests(shost);
1090 
1091         return 0;
1092 }
1093 
1094 static 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 
1107 static int uas_resume(struct usb_interface *intf)
1108 {
1109         return 0;
1110 }
1111 
1112 static 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 
1134 static 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  */
1160 static 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 
1176 static 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 
1189 module_usb_driver(uas_driver);
1190 
1191 MODULE_LICENSE("GPL");
1192 MODULE_AUTHOR(
1193         "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
1194 

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