1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
|
/*
* USB Attached SCSI
* Note that this is not the same as the USB Mass Storage driver
*
* Copyright Matthew Wilcox for Intel Corp, 2010
* Copyright Sarah Sharp for Intel Corp, 2010
*
* Distributed under the terms of the GNU GPL, version two.
*/
#include <linux/blkdev.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb_usual.h>
#include <linux/usb/hcd.h>
#include <linux/usb/storage.h>
#include <linux/usb/uas.h>
#include <scsi/scsi.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include "uas-detect.h"
/*
* The r00-r01c specs define this version of the SENSE IU data structure.
* It's still in use by several different firmware releases.
*/
struct sense_iu_old {
__u8 iu_id;
__u8 rsvd1;
__be16 tag;
__be16 len;
__u8 status;
__u8 service_response;
__u8 sense[SCSI_SENSE_BUFFERSIZE];
};
struct uas_dev_info {
struct usb_interface *intf;
struct usb_device *udev;
struct usb_anchor cmd_urbs;
struct usb_anchor sense_urbs;
struct usb_anchor data_urbs;
int qdepth, resetting;
struct response_iu response;
unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
unsigned use_streams:1;
unsigned uas_sense_old:1;
struct scsi_cmnd *cmnd;
spinlock_t lock;
struct work_struct work;
struct list_head work_list;
struct list_head dead_list;
};
enum {
SUBMIT_STATUS_URB = (1 << 1),
ALLOC_DATA_IN_URB = (1 << 2),
SUBMIT_DATA_IN_URB = (1 << 3),
ALLOC_DATA_OUT_URB = (1 << 4),
SUBMIT_DATA_OUT_URB = (1 << 5),
ALLOC_CMD_URB = (1 << 6),
SUBMIT_CMD_URB = (1 << 7),
COMMAND_INFLIGHT = (1 << 8),
DATA_IN_URB_INFLIGHT = (1 << 9),
DATA_OUT_URB_INFLIGHT = (1 << 10),
COMMAND_COMPLETED = (1 << 11),
COMMAND_ABORTED = (1 << 12),
UNLINK_DATA_URBS = (1 << 13),
IS_IN_WORK_LIST = (1 << 14),
};
/* Overrides scsi_pointer */
struct uas_cmd_info {
unsigned int state;
unsigned int stream;
struct urb *cmd_urb;
struct urb *data_in_urb;
struct urb *data_out_urb;
struct list_head work;
struct list_head dead;
};
/* I hate forward declarations, but I actually have a loop */
static int uas_submit_urbs(struct scsi_cmnd *cmnd,
struct uas_dev_info *devinfo, gfp_t gfp);
static void uas_do_work(struct work_struct *work);
static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
static void uas_configure_endpoints(struct uas_dev_info *devinfo);
static void uas_free_streams(struct uas_dev_info *devinfo);
static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller);
/* Must be called with devinfo->lock held, will temporary unlock the lock */
static void uas_unlink_data_urbs(struct uas_dev_info *devinfo,
struct uas_cmd_info *cmdinfo,
unsigned long *lock_flags)
{
/*
* The UNLINK_DATA_URBS flag makes sure uas_try_complete
* (called by urb completion) doesn't release cmdinfo
* underneath us.
*/
cmdinfo->state |= UNLINK_DATA_URBS;
spin_unlock_irqrestore(&devinfo->lock, *lock_flags);
if (cmdinfo->data_in_urb)
usb_unlink_urb(cmdinfo->data_in_urb);
if (cmdinfo->data_out_urb)
usb_unlink_urb(cmdinfo->data_out_urb);
spin_lock_irqsave(&devinfo->lock, *lock_flags);
cmdinfo->state &= ~UNLINK_DATA_URBS;
}
static void uas_do_work(struct work_struct *work)
{
struct uas_dev_info *devinfo =
container_of(work, struct uas_dev_info, work);
struct uas_cmd_info *cmdinfo;
struct uas_cmd_info *temp;
unsigned long flags;
int err;
spin_lock_irqsave(&devinfo->lock, flags);
list_for_each_entry_safe(cmdinfo, temp, &devinfo->work_list, work) {
struct scsi_pointer *scp = (void *)cmdinfo;
struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
SCp);
err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
if (!err) {
cmdinfo->state &= ~IS_IN_WORK_LIST;
list_del(&cmdinfo->work);
} else {
schedule_work(&devinfo->work);
}
}
spin_unlock_irqrestore(&devinfo->lock, flags);
}
static void uas_abort_work(struct uas_dev_info *devinfo)
{
struct uas_cmd_info *cmdinfo;
struct uas_cmd_info *temp;
unsigned long flags;
spin_lock_irqsave(&devinfo->lock, flags);
list_for_each_entry_safe(cmdinfo, temp, &devinfo->work_list, work) {
struct scsi_pointer *scp = (void *)cmdinfo;
struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
SCp);
uas_log_cmd_state(cmnd, __func__);
WARN_ON_ONCE(cmdinfo->state & COMMAND_ABORTED);
cmdinfo->state |= COMMAND_ABORTED;
cmdinfo->state &= ~IS_IN_WORK_LIST;
list_del(&cmdinfo->work);
list_add_tail(&cmdinfo->dead, &devinfo->dead_list);
}
spin_unlock_irqrestore(&devinfo->lock, flags);
}
static void uas_add_work(struct uas_cmd_info *cmdinfo)
{
struct scsi_pointer *scp = (void *)cmdinfo;
struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
struct uas_dev_info *devinfo = cmnd->device->hostdata;
WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
list_add_tail(&cmdinfo->work, &devinfo->work_list);
cmdinfo->state |= IS_IN_WORK_LIST;
schedule_work(&devinfo->work);
}
static void uas_zap_dead(struct uas_dev_info *devinfo)
{
struct uas_cmd_info *cmdinfo;
struct uas_cmd_info *temp;
unsigned long flags;
spin_lock_irqsave(&devinfo->lock, flags);
list_for_each_entry_safe(cmdinfo, temp, &devinfo->dead_list, dead) {
struct scsi_pointer *scp = (void *)cmdinfo;
struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
SCp);
uas_log_cmd_state(cmnd, __func__);
WARN_ON_ONCE(!(cmdinfo->state & COMMAND_ABORTED));
/* all urbs are killed, clear inflight bits */
cmdinfo->state &= ~(COMMAND_INFLIGHT |
DATA_IN_URB_INFLIGHT |
DATA_OUT_URB_INFLIGHT);
uas_try_complete(cmnd, __func__);
}
spin_unlock_irqrestore(&devinfo->lock, flags);
}
static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
{
struct sense_iu *sense_iu = urb->transfer_buffer;
struct scsi_device *sdev = cmnd->device;
if (urb->actual_length > 16) {
unsigned len = be16_to_cpup(&sense_iu->len);
if (len + 16 != urb->actual_length) {
int newlen = min(len + 16, urb->actual_length) - 16;
if (newlen < 0)
newlen = 0;
sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
"disagrees with IU sense data length %d, "
"using %d bytes of sense data\n", __func__,
urb->actual_length, len, newlen);
len = newlen;
}
memcpy(cmnd->sense_buffer, sense_iu->sense, len);
}
cmnd->result = sense_iu->status;
}
static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
{
struct sense_iu_old *sense_iu = urb->transfer_buffer;
struct scsi_device *sdev = cmnd->device;
if (urb->actual_length > 8) {
unsigned len = be16_to_cpup(&sense_iu->len) - 2;
if (len + 8 != urb->actual_length) {
int newlen = min(len + 8, urb->actual_length) - 8;
if (newlen < 0)
newlen = 0;
sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
"disagrees with IU sense data length %d, "
"using %d bytes of sense data\n", __func__,
urb->actual_length, len, newlen);
len = newlen;
}
memcpy(cmnd->sense_buffer, sense_iu->sense, len);
}
cmnd->result = sense_iu->status;
}
static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller)
{
struct uas_cmd_info *ci = (void *)&cmnd->SCp;
scmd_printk(KERN_INFO, cmnd, "%s %p tag %d, inflight:"
"%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
caller, cmnd, cmnd->request->tag,
(ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
(ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
(ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "",
(ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "",
(ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "",
(ci->state & ALLOC_CMD_URB) ? " a-cmd" : "",
(ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "",
(ci->state & COMMAND_INFLIGHT) ? " CMD" : "",
(ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
(ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
(ci->state & COMMAND_COMPLETED) ? " done" : "",
(ci->state & COMMAND_ABORTED) ? " abort" : "",
(ci->state & UNLINK_DATA_URBS) ? " unlink": "",
(ci->state & IS_IN_WORK_LIST) ? " work" : "");
}
static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
{
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
if (cmdinfo->state & (COMMAND_INFLIGHT |
DATA_IN_URB_INFLIGHT |
DATA_OUT_URB_INFLIGHT |
UNLINK_DATA_URBS))
return -EBUSY;
WARN_ON_ONCE(cmdinfo->state & COMMAND_COMPLETED);
cmdinfo->state |= COMMAND_COMPLETED;
usb_free_urb(cmdinfo->data_in_urb);
usb_free_urb(cmdinfo->data_out_urb);
if (cmdinfo->state & COMMAND_ABORTED) {
scmd_printk(KERN_INFO, cmnd, "abort completed\n");
cmnd->result = DID_ABORT << 16;
list_del(&cmdinfo->dead);
}
cmnd->scsi_done(cmnd);
return 0;
}
static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
unsigned direction)
{
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
int err;
cmdinfo->state |= direction | SUBMIT_STATUS_URB;
err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
if (err) {
uas_add_work(cmdinfo);
}
}
static void uas_stat_cmplt(struct urb *urb)
{
struct iu *iu = urb->transfer_buffer;
struct Scsi_Host *shost = urb->context;
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
struct scsi_cmnd *cmnd;
struct uas_cmd_info *cmdinfo;
unsigned long flags;
u16 tag;
if (urb->status) {
if (urb->status == -ENOENT) {
dev_err(&urb->dev->dev, "stat urb: killed, stream %d\n",
urb->stream_id);
} else {
dev_err(&urb->dev->dev, "stat urb: status %d\n",
urb->status);
}
usb_free_urb(urb);
return;
}
if (devinfo->resetting) {
usb_free_urb(urb);
return;
}
spin_lock_irqsave(&devinfo->lock, flags);
tag = be16_to_cpup(&iu->tag) - 1;
if (tag == 0)
cmnd = devinfo->cmnd;
else
cmnd = scsi_host_find_tag(shost, tag - 1);
if (!cmnd) {
if (iu->iu_id == IU_ID_RESPONSE) {
/* store results for uas_eh_task_mgmt() */
memcpy(&devinfo->response, iu, sizeof(devinfo->response));
}
usb_free_urb(urb);
spin_unlock_irqrestore(&devinfo->lock, flags);
return;
}
cmdinfo = (void *)&cmnd->SCp;
switch (iu->iu_id) {
case IU_ID_STATUS:
if (devinfo->cmnd == cmnd)
devinfo->cmnd = NULL;
if (urb->actual_length < 16)
devinfo->uas_sense_old = 1;
if (devinfo->uas_sense_old)
uas_sense_old(urb, cmnd);
else
uas_sense(urb, cmnd);
if (cmnd->result != 0) {
/* cancel data transfers on error */
uas_unlink_data_urbs(devinfo, cmdinfo, &flags);
}
cmdinfo->state &= ~COMMAND_INFLIGHT;
uas_try_complete(cmnd, __func__);
break;
case IU_ID_READ_READY:
uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
break;
case IU_ID_WRITE_READY:
uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
break;
default:
scmd_printk(KERN_ERR, cmnd,
"Bogus IU (%d) received on status pipe\n", iu->iu_id);
}
usb_free_urb(urb);
spin_unlock_irqrestore(&devinfo->lock, flags);
}
static void uas_data_cmplt(struct urb *urb)
{
struct scsi_cmnd *cmnd = urb->context;
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
struct scsi_data_buffer *sdb = NULL;
unsigned long flags;
spin_lock_irqsave(&devinfo->lock, flags);
if (cmdinfo->data_in_urb == urb) {
sdb = scsi_in(cmnd);
cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
} else if (cmdinfo->data_out_urb == urb) {
sdb = scsi_out(cmnd);
cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
}
if (sdb == NULL) {
WARN_ON_ONCE(1);
} else if (urb->status) {
/* error: no data transfered */
sdb->resid = sdb->length;
} else {
sdb->resid = sdb->length - urb->actual_length;
}
uas_try_complete(cmnd, __func__);
spin_unlock_irqrestore(&devinfo->lock, flags);
}
static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
unsigned int pipe, u16 stream_id,
struct scsi_cmnd *cmnd,
enum dma_data_direction dir)
{
struct usb_device *udev = devinfo->udev;
struct urb *urb = usb_alloc_urb(0, gfp);
struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
? scsi_in(cmnd) : scsi_out(cmnd);
if (!urb)
goto out;
usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
uas_data_cmplt, cmnd);
if (devinfo->use_streams)
urb->stream_id = stream_id;
urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
urb->sg = sdb->table.sgl;
out:
return urb;
}
static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
struct Scsi_Host *shost, u16 stream_id)
{
struct usb_device *udev = devinfo->udev;
struct urb *urb = usb_alloc_urb(0, gfp);
struct sense_iu *iu;
if (!urb)
goto out;
iu = kzalloc(sizeof(*iu), gfp);
if (!iu)
goto free;
usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
uas_stat_cmplt, shost);
urb->stream_id = stream_id;
urb->transfer_flags |= URB_FREE_BUFFER;
out:
return urb;
free:
usb_free_urb(urb);
return NULL;
}
static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
struct scsi_cmnd *cmnd)
{
struct usb_device *udev = devinfo->udev;
struct scsi_device *sdev = cmnd->device;
struct urb *urb = usb_alloc_urb(0, gfp);
struct command_iu *iu;
int len;
if (!urb)
goto out;
len = cmnd->cmd_len - 16;
if (len < 0)
len = 0;
len = ALIGN(len, 4);
iu = kzalloc(sizeof(*iu) + len, gfp);
if (!iu)
goto free;
iu->iu_id = IU_ID_COMMAND;
if (blk_rq_tagged(cmnd->request))
iu->tag = cpu_to_be16(cmnd->request->tag + 2);
else
iu->tag = cpu_to_be16(1);
iu->prio_attr = UAS_SIMPLE_TAG;
iu->len = len;
int_to_scsilun(sdev->lun, &iu->lun);
memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
usb_free_urb, NULL);
urb->transfer_flags |= URB_FREE_BUFFER;
out:
return urb;
free:
usb_free_urb(urb);
return NULL;
}
static int uas_submit_task_urb(struct scsi_cmnd *cmnd, gfp_t gfp,
u8 function, u16 stream_id)
{
struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
struct usb_device *udev = devinfo->udev;
struct urb *urb = usb_alloc_urb(0, gfp);
struct task_mgmt_iu *iu;
int err = -ENOMEM;
if (!urb)
goto err;
iu = kzalloc(sizeof(*iu), gfp);
if (!iu)
goto err;
iu->iu_id = IU_ID_TASK_MGMT;
iu->tag = cpu_to_be16(stream_id);
int_to_scsilun(cmnd->device->lun, &iu->lun);
iu->function = function;
switch (function) {
case TMF_ABORT_TASK:
if (blk_rq_tagged(cmnd->request))
iu->task_tag = cpu_to_be16(cmnd->request->tag + 2);
else
iu->task_tag = cpu_to_be16(1);
break;
}
usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu),
usb_free_urb, NULL);
urb->transfer_flags |= URB_FREE_BUFFER;
usb_anchor_urb(urb, &devinfo->cmd_urbs);
err = usb_submit_urb(urb, gfp);
if (err) {
usb_unanchor_urb(urb);
goto err;
}
return 0;
err:
usb_free_urb(urb);
return err;
}
/*
* Why should I request the Status IU before sending the Command IU? Spec
* says to, but also says the device may receive them in any order. Seems
* daft to me.
*/
static int uas_submit_sense_urb(struct Scsi_Host *shost,
gfp_t gfp, unsigned int stream)
{
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
struct urb *urb;
urb = uas_alloc_sense_urb(devinfo, gfp, shost, stream);
if (!urb)
return SCSI_MLQUEUE_DEVICE_BUSY;
usb_anchor_urb(urb, &devinfo->sense_urbs);
if (usb_submit_urb(urb, gfp)) {
usb_unanchor_urb(urb);
shost_printk(KERN_INFO, shost,
"sense urb submission failure\n");
usb_free_urb(urb);
return SCSI_MLQUEUE_DEVICE_BUSY;
}
return 0;
}
static int uas_submit_urbs(struct scsi_cmnd *cmnd,
struct uas_dev_info *devinfo, gfp_t gfp)
{
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
int err;
WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
if (cmdinfo->state & SUBMIT_STATUS_URB) {
err = uas_submit_sense_urb(cmnd->device->host, gfp,
cmdinfo->stream);
if (err) {
return err;
}
cmdinfo->state &= ~SUBMIT_STATUS_URB;
}
if (cmdinfo->state & ALLOC_DATA_IN_URB) {
cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
devinfo->data_in_pipe, cmdinfo->stream,
cmnd, DMA_FROM_DEVICE);
if (!cmdinfo->data_in_urb)
return SCSI_MLQUEUE_DEVICE_BUSY;
cmdinfo->state &= ~ALLOC_DATA_IN_URB;
}
if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
usb_unanchor_urb(cmdinfo->data_in_urb);
scmd_printk(KERN_INFO, cmnd,
"data in urb submission failure\n");
return SCSI_MLQUEUE_DEVICE_BUSY;
}
cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
cmdinfo->state |= DATA_IN_URB_INFLIGHT;
}
if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
devinfo->data_out_pipe, cmdinfo->stream,
cmnd, DMA_TO_DEVICE);
if (!cmdinfo->data_out_urb)
return SCSI_MLQUEUE_DEVICE_BUSY;
cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
}
if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
usb_unanchor_urb(cmdinfo->data_out_urb);
scmd_printk(KERN_INFO, cmnd,
"data out urb submission failure\n");
return SCSI_MLQUEUE_DEVICE_BUSY;
}
cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
}
if (cmdinfo->state & ALLOC_CMD_URB) {
cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd);
if (!cmdinfo->cmd_urb)
return SCSI_MLQUEUE_DEVICE_BUSY;
cmdinfo->state &= ~ALLOC_CMD_URB;
}
if (cmdinfo->state & SUBMIT_CMD_URB) {
usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
usb_unanchor_urb(cmdinfo->cmd_urb);
scmd_printk(KERN_INFO, cmnd,
"cmd urb submission failure\n");
return SCSI_MLQUEUE_DEVICE_BUSY;
}
cmdinfo->cmd_urb = NULL;
cmdinfo->state &= ~SUBMIT_CMD_URB;
cmdinfo->state |= COMMAND_INFLIGHT;
}
return 0;
}
static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
void (*done)(struct scsi_cmnd *))
{
struct scsi_device *sdev = cmnd->device;
struct uas_dev_info *devinfo = sdev->hostdata;
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
unsigned long flags;
int err;
BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
if (devinfo->resetting) {
cmnd->result = DID_ERROR << 16;
cmnd->scsi_done(cmnd);
return 0;
}
spin_lock_irqsave(&devinfo->lock, flags);
if (devinfo->cmnd) {
spin_unlock_irqrestore(&devinfo->lock, flags);
return SCSI_MLQUEUE_DEVICE_BUSY;
}
if (blk_rq_tagged(cmnd->request)) {
cmdinfo->stream = cmnd->request->tag + 2;
} else {
devinfo->cmnd = cmnd;
cmdinfo->stream = 1;
}
cmnd->scsi_done = done;
cmdinfo->state = SUBMIT_STATUS_URB |
ALLOC_CMD_URB | SUBMIT_CMD_URB;
switch (cmnd->sc_data_direction) {
case DMA_FROM_DEVICE:
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
break;
case DMA_BIDIRECTIONAL:
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
case DMA_TO_DEVICE:
cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
case DMA_NONE:
break;
}
if (!devinfo->use_streams) {
cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
cmdinfo->stream = 0;
}
err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
if (err) {
/* If we did nothing, give up now */
if (cmdinfo->state & SUBMIT_STATUS_URB) {
spin_unlock_irqrestore(&devinfo->lock, flags);
return SCSI_MLQUEUE_DEVICE_BUSY;
}
uas_add_work(cmdinfo);
}
spin_unlock_irqrestore(&devinfo->lock, flags);
return 0;
}
static DEF_SCSI_QCMD(uas_queuecommand)
static int uas_eh_task_mgmt(struct scsi_cmnd *cmnd,
const char *fname, u8 function)
{
struct Scsi_Host *shost = cmnd->device->host;
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
u16 tag = devinfo->qdepth;
unsigned long flags;
spin_lock_irqsave(&devinfo->lock, flags);
memset(&devinfo->response, 0, sizeof(devinfo->response));
if (uas_submit_sense_urb(shost, GFP_ATOMIC, tag)) {
shost_printk(KERN_INFO, shost,
"%s: %s: submit sense urb failed\n",
__func__, fname);
spin_unlock_irqrestore(&devinfo->lock, flags);
return FAILED;
}
if (uas_submit_task_urb(cmnd, GFP_ATOMIC, function, tag)) {
shost_printk(KERN_INFO, shost,
"%s: %s: submit task mgmt urb failed\n",
__func__, fname);
spin_unlock_irqrestore(&devinfo->lock, flags);
return FAILED;
}
spin_unlock_irqrestore(&devinfo->lock, flags);
if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 3000) == 0) {
shost_printk(KERN_INFO, shost,
"%s: %s timed out\n", __func__, fname);
return FAILED;
}
if (be16_to_cpu(devinfo->response.tag) != tag) {
shost_printk(KERN_INFO, shost,
"%s: %s failed (wrong tag %d/%d)\n", __func__,
fname, be16_to_cpu(devinfo->response.tag), tag);
return FAILED;
}
if (devinfo->response.response_code != RC_TMF_COMPLETE) {
shost_printk(KERN_INFO, shost,
"%s: %s failed (rc 0x%x)\n", __func__,
fname, devinfo->response.response_code);
return FAILED;
}
return SUCCESS;
}
static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
{
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
unsigned long flags;
int ret;
uas_log_cmd_state(cmnd, __func__);
spin_lock_irqsave(&devinfo->lock, flags);
WARN_ON_ONCE(cmdinfo->state & COMMAND_ABORTED);
cmdinfo->state |= COMMAND_ABORTED;
list_add_tail(&cmdinfo->dead, &devinfo->dead_list);
if (cmdinfo->state & IS_IN_WORK_LIST) {
list_del(&cmdinfo->work);
cmdinfo->state &= ~IS_IN_WORK_LIST;
}
if (cmdinfo->state & COMMAND_INFLIGHT) {
spin_unlock_irqrestore(&devinfo->lock, flags);
ret = uas_eh_task_mgmt(cmnd, "ABORT TASK", TMF_ABORT_TASK);
} else {
uas_unlink_data_urbs(devinfo, cmdinfo, &flags);
uas_try_complete(cmnd, __func__);
spin_unlock_irqrestore(&devinfo->lock, flags);
ret = SUCCESS;
}
return ret;
}
static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
{
sdev_printk(KERN_INFO, cmnd->device, "%s\n", __func__);
return uas_eh_task_mgmt(cmnd, "LOGICAL UNIT RESET",
TMF_LOGICAL_UNIT_RESET);
}
static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
{
struct scsi_device *sdev = cmnd->device;
struct uas_dev_info *devinfo = sdev->hostdata;
struct usb_device *udev = devinfo->udev;
int err;
err = usb_lock_device_for_reset(udev, devinfo->intf);
if (err) {
shost_printk(KERN_ERR, sdev->host,
"%s FAILED to get lock err %d\n", __func__, err);
return FAILED;
}
shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
devinfo->resetting = 1;
uas_abort_work(devinfo);
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
usb_kill_anchored_urbs(&devinfo->sense_urbs);
usb_kill_anchored_urbs(&devinfo->data_urbs);
uas_zap_dead(devinfo);
err = usb_reset_device(udev);
devinfo->resetting = 0;
usb_unlock_device(udev);
if (err) {
shost_printk(KERN_INFO, sdev->host, "%s FAILED\n", __func__);
return FAILED;
}
shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
return SUCCESS;
}
static int uas_slave_alloc(struct scsi_device *sdev)
{
sdev->hostdata = (void *)sdev->host->hostdata[0];
return 0;
}
static int uas_slave_configure(struct scsi_device *sdev)
{
struct uas_dev_info *devinfo = sdev->hostdata;
scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
scsi_activate_tcq(sdev, devinfo->qdepth - 2);
return 0;
}
static struct scsi_host_template uas_host_template = {
.module = THIS_MODULE,
.name = "uas",
.queuecommand = uas_queuecommand,
.slave_alloc = uas_slave_alloc,
.slave_configure = uas_slave_configure,
.eh_abort_handler = uas_eh_abort_handler,
.eh_device_reset_handler = uas_eh_device_reset_handler,
.eh_bus_reset_handler = uas_eh_bus_reset_handler,
.can_queue = 65536, /* Is there a limit on the _host_ ? */
.this_id = -1,
.sg_tablesize = SG_NONE,
.cmd_per_lun = 1, /* until we override it */
.skip_settle_delay = 1,
.ordered_tag = 1,
};
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
vendorName, productName, useProtocol, useTransport, \
initFunction, flags) \
{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
.driver_info = (flags) }
static struct usb_device_id uas_usb_ids[] = {
# include "unusual_uas.h"
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
/* 0xaa is a prototype device I happen to have access to */
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
{ }
};
MODULE_DEVICE_TABLE(usb, uas_usb_ids);
#undef UNUSUAL_DEV
static int uas_switch_interface(struct usb_device *udev,
struct usb_interface *intf)
{
int alt;
alt = uas_find_uas_alt_setting(intf);
if (alt < 0)
return alt;
return usb_set_interface(udev,
intf->altsetting[0].desc.bInterfaceNumber, alt);
}
static int uas_find_endpoints(struct usb_host_interface *alt,
struct usb_host_endpoint *eps[])
{
struct usb_host_endpoint *endpoint = alt->endpoint;
unsigned i, n_endpoints = alt->desc.bNumEndpoints;
for (i = 0; i < n_endpoints; i++) {
unsigned char *extra = endpoint[i].extra;
int len = endpoint[i].extralen;
while (len >= 3) {
if (extra[1] == USB_DT_PIPE_USAGE) {
unsigned pipe_id = extra[2];
if (pipe_id > 0 && pipe_id < 5)
eps[pipe_id - 1] = &endpoint[i];
break;
}
len -= extra[0];
extra += extra[0];
}
}
if (!eps[0] || !eps[1] || !eps[2] || !eps[3])
return -ENODEV;
return 0;
}
static void uas_configure_endpoints(struct uas_dev_info *devinfo)
{
struct usb_host_endpoint *eps[4] = { };
struct usb_device *udev = devinfo->udev;
int r;
devinfo->uas_sense_old = 0;
devinfo->cmnd = NULL;
r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
/*
* Assume that if we didn't find a proper set of descriptors, we're
* using a device with old firmware that happens to be set up like
* this.
*/
if (r != 0) {
devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1);
devinfo->status_pipe = usb_rcvbulkpipe(udev, 1);
devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2);
devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2);
eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe);
eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
} else {
devinfo->cmd_pipe = usb_sndbulkpipe(udev,
usb_endpoint_num(&eps[0]->desc));
devinfo->status_pipe = usb_rcvbulkpipe(udev,
usb_endpoint_num(&eps[1]->desc));
devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
usb_endpoint_num(&eps[2]->desc));
devinfo->data_out_pipe = usb_sndbulkpipe(udev,
usb_endpoint_num(&eps[3]->desc));
}
devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256,
GFP_KERNEL);
if (devinfo->qdepth < 0) {
devinfo->qdepth = 256;
devinfo->use_streams = 0;
} else {
devinfo->use_streams = 1;
}
}
static void uas_free_streams(struct uas_dev_info *devinfo)
{
struct usb_device *udev = devinfo->udev;
struct usb_host_endpoint *eps[3];
eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
usb_free_streams(devinfo->intf, eps, 3, GFP_KERNEL);
}
/*
* XXX: What I'd like to do here is register a SCSI host for each USB host in
* the system. Follow usb-storage's design of registering a SCSI host for
* each USB device for the moment. Can implement this by walking up the
* USB hierarchy until we find a USB host.
*/
static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
int result = -ENOMEM;
struct Scsi_Host *shost = NULL;
struct uas_dev_info *devinfo;
struct usb_device *udev = interface_to_usbdev(intf);
if (!uas_use_uas_driver(intf, id))
return -ENODEV;
if (uas_switch_interface(udev, intf))
return -ENODEV;
devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL);
if (!devinfo)
goto set_alt0;
shost = scsi_host_alloc(&uas_host_template, sizeof(void *));
if (!shost)
goto set_alt0;
shost->max_cmd_len = 16 + 252;
shost->max_id = 1;
shost->max_lun = 256;
shost->max_channel = 0;
shost->sg_tablesize = udev->bus->sg_tablesize;
devinfo->intf = intf;
devinfo->udev = udev;
devinfo->resetting = 0;
init_usb_anchor(&devinfo->cmd_urbs);
init_usb_anchor(&devinfo->sense_urbs);
init_usb_anchor(&devinfo->data_urbs);
spin_lock_init(&devinfo->lock);
INIT_WORK(&devinfo->work, uas_do_work);
INIT_LIST_HEAD(&devinfo->work_list);
INIT_LIST_HEAD(&devinfo->dead_list);
uas_configure_endpoints(devinfo);
result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
if (result)
goto free_streams;
result = scsi_add_host(shost, &intf->dev);
if (result)
goto free_streams;
shost->hostdata[0] = (unsigned long)devinfo;
scsi_scan_host(shost);
usb_set_intfdata(intf, shost);
return result;
free_streams:
uas_free_streams(devinfo);
set_alt0:
usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
kfree(devinfo);
if (shost)
scsi_host_put(shost);
return result;
}
static int uas_pre_reset(struct usb_interface *intf)
{
struct Scsi_Host *shost = usb_get_intfdata(intf);
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
unsigned long flags;
/* Block new requests */
spin_lock_irqsave(shost->host_lock, flags);
scsi_block_requests(shost);
spin_unlock_irqrestore(shost->host_lock, flags);
/* Wait for any pending requests to complete */
flush_work(&devinfo->work);
if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000) == 0) {
shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
return 1;
}
uas_free_streams(devinfo);
return 0;
}
static int uas_post_reset(struct usb_interface *intf)
{
struct Scsi_Host *shost = usb_get_intfdata(intf);
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
unsigned long flags;
uas_configure_endpoints(devinfo);
spin_lock_irqsave(shost->host_lock, flags);
scsi_report_bus_reset(shost, 0);
spin_unlock_irqrestore(shost->host_lock, flags);
scsi_unblock_requests(shost);
return 0;
}
static void uas_disconnect(struct usb_interface *intf)
{
struct Scsi_Host *shost = usb_get_intfdata(intf);
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
devinfo->resetting = 1;
cancel_work_sync(&devinfo->work);
uas_abort_work(devinfo);
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
usb_kill_anchored_urbs(&devinfo->sense_urbs);
usb_kill_anchored_urbs(&devinfo->data_urbs);
uas_zap_dead(devinfo);
scsi_remove_host(shost);
uas_free_streams(devinfo);
kfree(devinfo);
}
static struct usb_driver uas_driver = {
.name = "uas",
.probe = uas_probe,
.disconnect = uas_disconnect,
.pre_reset = uas_pre_reset,
.post_reset = uas_post_reset,
.id_table = uas_usb_ids,
};
module_usb_driver(uas_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp");
|