forked from altera-opensource/linux-socfpga
-
Notifications
You must be signed in to change notification settings - Fork 0
/
sed-opal.c
2515 lines (2050 loc) · 58.2 KB
/
sed-opal.c
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
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright © 2016 Intel Corporation
*
* Authors:
* Scott Bauer <[email protected]>
* Rafael Antognolli <[email protected]>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":OPAL: " fmt
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <uapi/linux/sed-opal.h>
#include <linux/sed-opal.h>
#include <linux/string.h>
#include <linux/kdev_t.h>
#include "opal_proto.h"
#define IO_BUFFER_LENGTH 2048
#define MAX_TOKS 64
/* Number of bytes needed by cmd_finalize. */
#define CMD_FINALIZE_BYTES_NEEDED 7
struct opal_step {
int (*fn)(struct opal_dev *dev, void *data);
void *data;
};
typedef int (cont_fn)(struct opal_dev *dev);
enum opal_atom_width {
OPAL_WIDTH_TINY,
OPAL_WIDTH_SHORT,
OPAL_WIDTH_MEDIUM,
OPAL_WIDTH_LONG,
OPAL_WIDTH_TOKEN
};
/*
* On the parsed response, we don't store again the toks that are already
* stored in the response buffer. Instead, for each token, we just store a
* pointer to the position in the buffer where the token starts, and the size
* of the token in bytes.
*/
struct opal_resp_tok {
const u8 *pos;
size_t len;
enum opal_response_token type;
enum opal_atom_width width;
union {
u64 u;
s64 s;
} stored;
};
/*
* From the response header it's not possible to know how many tokens there are
* on the payload. So we hardcode that the maximum will be MAX_TOKS, and later
* if we start dealing with messages that have more than that, we can increase
* this number. This is done to avoid having to make two passes through the
* response, the first one counting how many tokens we have and the second one
* actually storing the positions.
*/
struct parsed_resp {
int num;
struct opal_resp_tok toks[MAX_TOKS];
};
struct opal_dev {
bool supported;
bool mbr_enabled;
void *data;
sec_send_recv *send_recv;
struct mutex dev_lock;
u16 comid;
u32 hsn;
u32 tsn;
u64 align;
u64 lowest_lba;
size_t pos;
u8 cmd[IO_BUFFER_LENGTH];
u8 resp[IO_BUFFER_LENGTH];
struct parsed_resp parsed;
size_t prev_d_len;
void *prev_data;
struct list_head unlk_lst;
};
static const u8 opaluid[][OPAL_UID_LENGTH] = {
/* users */
[OPAL_SMUID_UID] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff },
[OPAL_THISSP_UID] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 },
[OPAL_ADMINSP_UID] =
{ 0x00, 0x00, 0x02, 0x05, 0x00, 0x00, 0x00, 0x01 },
[OPAL_LOCKINGSP_UID] =
{ 0x00, 0x00, 0x02, 0x05, 0x00, 0x00, 0x00, 0x02 },
[OPAL_ENTERPRISE_LOCKINGSP_UID] =
{ 0x00, 0x00, 0x02, 0x05, 0x00, 0x01, 0x00, 0x01 },
[OPAL_ANYBODY_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x01 },
[OPAL_SID_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x06 },
[OPAL_ADMIN1_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x01, 0x00, 0x01 },
[OPAL_USER1_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x03, 0x00, 0x01 },
[OPAL_USER2_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x03, 0x00, 0x02 },
[OPAL_PSID_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x01, 0xff, 0x01 },
[OPAL_ENTERPRISE_BANDMASTER0_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x80, 0x01 },
[OPAL_ENTERPRISE_ERASEMASTER_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x84, 0x01 },
/* tables */
[OPAL_TABLE_TABLE] =
{ 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01 },
[OPAL_LOCKINGRANGE_GLOBAL] =
{ 0x00, 0x00, 0x08, 0x02, 0x00, 0x00, 0x00, 0x01 },
[OPAL_LOCKINGRANGE_ACE_RDLOCKED] =
{ 0x00, 0x00, 0x00, 0x08, 0x00, 0x03, 0xE0, 0x01 },
[OPAL_LOCKINGRANGE_ACE_WRLOCKED] =
{ 0x00, 0x00, 0x00, 0x08, 0x00, 0x03, 0xE8, 0x01 },
[OPAL_MBRCONTROL] =
{ 0x00, 0x00, 0x08, 0x03, 0x00, 0x00, 0x00, 0x01 },
[OPAL_MBR] =
{ 0x00, 0x00, 0x08, 0x04, 0x00, 0x00, 0x00, 0x00 },
[OPAL_AUTHORITY_TABLE] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x00},
[OPAL_C_PIN_TABLE] =
{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x00, 0x00},
[OPAL_LOCKING_INFO_TABLE] =
{ 0x00, 0x00, 0x08, 0x01, 0x00, 0x00, 0x00, 0x01 },
[OPAL_ENTERPRISE_LOCKING_INFO_TABLE] =
{ 0x00, 0x00, 0x08, 0x01, 0x00, 0x00, 0x00, 0x00 },
/* C_PIN_TABLE object ID's */
[OPAL_C_PIN_MSID] =
{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x84, 0x02},
[OPAL_C_PIN_SID] =
{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x00, 0x01},
[OPAL_C_PIN_ADMIN1] =
{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x01, 0x00, 0x01},
/* half UID's (only first 4 bytes used) */
[OPAL_HALF_UID_AUTHORITY_OBJ_REF] =
{ 0x00, 0x00, 0x0C, 0x05, 0xff, 0xff, 0xff, 0xff },
[OPAL_HALF_UID_BOOLEAN_ACE] =
{ 0x00, 0x00, 0x04, 0x0E, 0xff, 0xff, 0xff, 0xff },
/* special value for omitted optional parameter */
[OPAL_UID_HEXFF] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
};
/*
* TCG Storage SSC Methods.
* Derived from: TCG_Storage_Architecture_Core_Spec_v2.01_r1.00
* Section: 6.3 Assigned UIDs
*/
static const u8 opalmethod[][OPAL_METHOD_LENGTH] = {
[OPAL_PROPERTIES] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x01 },
[OPAL_STARTSESSION] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x02 },
[OPAL_REVERT] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x02, 0x02 },
[OPAL_ACTIVATE] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x02, 0x03 },
[OPAL_EGET] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x06 },
[OPAL_ESET] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x07 },
[OPAL_NEXT] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x08 },
[OPAL_EAUTHENTICATE] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x0c },
[OPAL_GETACL] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x0d },
[OPAL_GENKEY] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x10 },
[OPAL_REVERTSP] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x11 },
[OPAL_GET] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x16 },
[OPAL_SET] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x17 },
[OPAL_AUTHENTICATE] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x1c },
[OPAL_RANDOM] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x06, 0x01 },
[OPAL_ERASE] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x08, 0x03 },
};
static int end_opal_session_error(struct opal_dev *dev);
static int opal_discovery0_step(struct opal_dev *dev);
struct opal_suspend_data {
struct opal_lock_unlock unlk;
u8 lr;
struct list_head node;
};
/*
* Derived from:
* TCG_Storage_Architecture_Core_Spec_v2.01_r1.00
* Section: 5.1.5 Method Status Codes
*/
static const char * const opal_errors[] = {
"Success",
"Not Authorized",
"Unknown Error",
"SP Busy",
"SP Failed",
"SP Disabled",
"SP Frozen",
"No Sessions Available",
"Uniqueness Conflict",
"Insufficient Space",
"Insufficient Rows",
"Invalid Function",
"Invalid Parameter",
"Invalid Reference",
"Unknown Error",
"TPER Malfunction",
"Transaction Failure",
"Response Overflow",
"Authority Locked Out",
};
static const char *opal_error_to_human(int error)
{
if (error == 0x3f)
return "Failed";
if (error >= ARRAY_SIZE(opal_errors) || error < 0)
return "Unknown Error";
return opal_errors[error];
}
static void print_buffer(const u8 *ptr, u32 length)
{
#ifdef DEBUG
print_hex_dump_bytes("OPAL: ", DUMP_PREFIX_OFFSET, ptr, length);
pr_debug("\n");
#endif
}
static bool check_tper(const void *data)
{
const struct d0_tper_features *tper = data;
u8 flags = tper->supported_features;
if (!(flags & TPER_SYNC_SUPPORTED)) {
pr_debug("TPer sync not supported. flags = %d\n",
tper->supported_features);
return false;
}
return true;
}
static bool check_mbrenabled(const void *data)
{
const struct d0_locking_features *lfeat = data;
u8 sup_feat = lfeat->supported_features;
return !!(sup_feat & MBR_ENABLED_MASK);
}
static bool check_sum(const void *data)
{
const struct d0_single_user_mode *sum = data;
u32 nlo = be32_to_cpu(sum->num_locking_objects);
if (nlo == 0) {
pr_debug("Need at least one locking object.\n");
return false;
}
pr_debug("Number of locking objects: %d\n", nlo);
return true;
}
static u16 get_comid_v100(const void *data)
{
const struct d0_opal_v100 *v100 = data;
return be16_to_cpu(v100->baseComID);
}
static u16 get_comid_v200(const void *data)
{
const struct d0_opal_v200 *v200 = data;
return be16_to_cpu(v200->baseComID);
}
static int opal_send_cmd(struct opal_dev *dev)
{
return dev->send_recv(dev->data, dev->comid, TCG_SECP_01,
dev->cmd, IO_BUFFER_LENGTH,
true);
}
static int opal_recv_cmd(struct opal_dev *dev)
{
return dev->send_recv(dev->data, dev->comid, TCG_SECP_01,
dev->resp, IO_BUFFER_LENGTH,
false);
}
static int opal_recv_check(struct opal_dev *dev)
{
size_t buflen = IO_BUFFER_LENGTH;
void *buffer = dev->resp;
struct opal_header *hdr = buffer;
int ret;
do {
pr_debug("Sent OPAL command: outstanding=%d, minTransfer=%d\n",
hdr->cp.outstandingData,
hdr->cp.minTransfer);
if (hdr->cp.outstandingData == 0 ||
hdr->cp.minTransfer != 0)
return 0;
memset(buffer, 0, buflen);
ret = opal_recv_cmd(dev);
} while (!ret);
return ret;
}
static int opal_send_recv(struct opal_dev *dev, cont_fn *cont)
{
int ret;
ret = opal_send_cmd(dev);
if (ret)
return ret;
ret = opal_recv_cmd(dev);
if (ret)
return ret;
ret = opal_recv_check(dev);
if (ret)
return ret;
return cont(dev);
}
static void check_geometry(struct opal_dev *dev, const void *data)
{
const struct d0_geometry_features *geo = data;
dev->align = be64_to_cpu(geo->alignment_granularity);
dev->lowest_lba = be64_to_cpu(geo->lowest_aligned_lba);
}
static int execute_step(struct opal_dev *dev,
const struct opal_step *step, size_t stepIndex)
{
int error = step->fn(dev, step->data);
if (error) {
pr_debug("Step %zu (%pS) failed with error %d: %s\n",
stepIndex, step->fn, error,
opal_error_to_human(error));
}
return error;
}
static int execute_steps(struct opal_dev *dev,
const struct opal_step *steps, size_t n_steps)
{
size_t state = 0;
int error;
/* first do a discovery0 */
error = opal_discovery0_step(dev);
if (error)
return error;
for (state = 0; state < n_steps; state++) {
error = execute_step(dev, &steps[state], state);
if (error)
goto out_error;
}
return 0;
out_error:
/*
* For each OPAL command the first step in steps starts some sort of
* session. If an error occurred in the initial discovery0 or if an
* error occurred in the first step (and thus stopping the loop with
* state == 0) then there was an error before or during the attempt to
* start a session. Therefore we shouldn't attempt to terminate a
* session, as one has not yet been created.
*/
if (state > 0)
end_opal_session_error(dev);
return error;
}
static int opal_discovery0_end(struct opal_dev *dev)
{
bool found_com_id = false, supported = true, single_user = false;
const struct d0_header *hdr = (struct d0_header *)dev->resp;
const u8 *epos = dev->resp, *cpos = dev->resp;
u16 comid = 0;
u32 hlen = be32_to_cpu(hdr->length);
print_buffer(dev->resp, hlen);
dev->mbr_enabled = false;
if (hlen > IO_BUFFER_LENGTH - sizeof(*hdr)) {
pr_debug("Discovery length overflows buffer (%zu+%u)/%u\n",
sizeof(*hdr), hlen, IO_BUFFER_LENGTH);
return -EFAULT;
}
epos += hlen; /* end of buffer */
cpos += sizeof(*hdr); /* current position on buffer */
while (cpos < epos && supported) {
const struct d0_features *body =
(const struct d0_features *)cpos;
switch (be16_to_cpu(body->code)) {
case FC_TPER:
supported = check_tper(body->features);
break;
case FC_SINGLEUSER:
single_user = check_sum(body->features);
break;
case FC_GEOMETRY:
check_geometry(dev, body);
break;
case FC_LOCKING:
dev->mbr_enabled = check_mbrenabled(body->features);
break;
case FC_ENTERPRISE:
case FC_DATASTORE:
/* some ignored properties */
pr_debug("Found OPAL feature description: %d\n",
be16_to_cpu(body->code));
break;
case FC_OPALV100:
comid = get_comid_v100(body->features);
found_com_id = true;
break;
case FC_OPALV200:
comid = get_comid_v200(body->features);
found_com_id = true;
break;
case 0xbfff ... 0xffff:
/* vendor specific, just ignore */
break;
default:
pr_debug("OPAL Unknown feature: %d\n",
be16_to_cpu(body->code));
}
cpos += body->length + 4;
}
if (!supported) {
pr_debug("This device is not Opal enabled. Not Supported!\n");
return -EOPNOTSUPP;
}
if (!single_user)
pr_debug("Device doesn't support single user mode\n");
if (!found_com_id) {
pr_debug("Could not find OPAL comid for device. Returning early\n");
return -EOPNOTSUPP;
}
dev->comid = comid;
return 0;
}
static int opal_discovery0(struct opal_dev *dev, void *data)
{
int ret;
memset(dev->resp, 0, IO_BUFFER_LENGTH);
dev->comid = OPAL_DISCOVERY_COMID;
ret = opal_recv_cmd(dev);
if (ret)
return ret;
return opal_discovery0_end(dev);
}
static int opal_discovery0_step(struct opal_dev *dev)
{
const struct opal_step discovery0_step = {
opal_discovery0,
};
return execute_step(dev, &discovery0_step, 0);
}
static size_t remaining_size(struct opal_dev *cmd)
{
return IO_BUFFER_LENGTH - cmd->pos;
}
static bool can_add(int *err, struct opal_dev *cmd, size_t len)
{
if (*err)
return false;
if (remaining_size(cmd) < len) {
pr_debug("Error adding %zu bytes: end of buffer.\n", len);
*err = -ERANGE;
return false;
}
return true;
}
static void add_token_u8(int *err, struct opal_dev *cmd, u8 tok)
{
if (!can_add(err, cmd, 1))
return;
cmd->cmd[cmd->pos++] = tok;
}
static void add_short_atom_header(struct opal_dev *cmd, bool bytestring,
bool has_sign, int len)
{
u8 atom;
int err = 0;
atom = SHORT_ATOM_ID;
atom |= bytestring ? SHORT_ATOM_BYTESTRING : 0;
atom |= has_sign ? SHORT_ATOM_SIGNED : 0;
atom |= len & SHORT_ATOM_LEN_MASK;
add_token_u8(&err, cmd, atom);
}
static void add_medium_atom_header(struct opal_dev *cmd, bool bytestring,
bool has_sign, int len)
{
u8 header0;
header0 = MEDIUM_ATOM_ID;
header0 |= bytestring ? MEDIUM_ATOM_BYTESTRING : 0;
header0 |= has_sign ? MEDIUM_ATOM_SIGNED : 0;
header0 |= (len >> 8) & MEDIUM_ATOM_LEN_MASK;
cmd->cmd[cmd->pos++] = header0;
cmd->cmd[cmd->pos++] = len;
}
static void add_token_u64(int *err, struct opal_dev *cmd, u64 number)
{
size_t len;
int msb;
if (!(number & ~TINY_ATOM_DATA_MASK)) {
add_token_u8(err, cmd, number);
return;
}
msb = fls64(number);
len = DIV_ROUND_UP(msb, 8);
if (!can_add(err, cmd, len + 1)) {
pr_debug("Error adding u64: end of buffer.\n");
return;
}
add_short_atom_header(cmd, false, false, len);
while (len--)
add_token_u8(err, cmd, number >> (len * 8));
}
static u8 *add_bytestring_header(int *err, struct opal_dev *cmd, size_t len)
{
size_t header_len = 1;
bool is_short_atom = true;
if (len & ~SHORT_ATOM_LEN_MASK) {
header_len = 2;
is_short_atom = false;
}
if (!can_add(err, cmd, header_len + len)) {
pr_debug("Error adding bytestring: end of buffer.\n");
return NULL;
}
if (is_short_atom)
add_short_atom_header(cmd, true, false, len);
else
add_medium_atom_header(cmd, true, false, len);
return &cmd->cmd[cmd->pos];
}
static void add_token_bytestring(int *err, struct opal_dev *cmd,
const u8 *bytestring, size_t len)
{
u8 *start;
start = add_bytestring_header(err, cmd, len);
if (!start)
return;
memcpy(start, bytestring, len);
cmd->pos += len;
}
static int build_locking_range(u8 *buffer, size_t length, u8 lr)
{
if (length > OPAL_UID_LENGTH) {
pr_debug("Can't build locking range. Length OOB\n");
return -ERANGE;
}
memcpy(buffer, opaluid[OPAL_LOCKINGRANGE_GLOBAL], OPAL_UID_LENGTH);
if (lr == 0)
return 0;
buffer[5] = LOCKING_RANGE_NON_GLOBAL;
buffer[7] = lr;
return 0;
}
static int build_locking_user(u8 *buffer, size_t length, u8 lr)
{
if (length > OPAL_UID_LENGTH) {
pr_debug("Can't build locking range user. Length OOB\n");
return -ERANGE;
}
memcpy(buffer, opaluid[OPAL_USER1_UID], OPAL_UID_LENGTH);
buffer[7] = lr + 1;
return 0;
}
static void set_comid(struct opal_dev *cmd, u16 comid)
{
struct opal_header *hdr = (struct opal_header *)cmd->cmd;
hdr->cp.extendedComID[0] = comid >> 8;
hdr->cp.extendedComID[1] = comid;
hdr->cp.extendedComID[2] = 0;
hdr->cp.extendedComID[3] = 0;
}
static int cmd_finalize(struct opal_dev *cmd, u32 hsn, u32 tsn)
{
struct opal_header *hdr;
int err = 0;
/*
* Close the parameter list opened from cmd_start.
* The number of bytes added must be equal to
* CMD_FINALIZE_BYTES_NEEDED.
*/
add_token_u8(&err, cmd, OPAL_ENDLIST);
add_token_u8(&err, cmd, OPAL_ENDOFDATA);
add_token_u8(&err, cmd, OPAL_STARTLIST);
add_token_u8(&err, cmd, 0);
add_token_u8(&err, cmd, 0);
add_token_u8(&err, cmd, 0);
add_token_u8(&err, cmd, OPAL_ENDLIST);
if (err) {
pr_debug("Error finalizing command.\n");
return -EFAULT;
}
hdr = (struct opal_header *) cmd->cmd;
hdr->pkt.tsn = cpu_to_be32(tsn);
hdr->pkt.hsn = cpu_to_be32(hsn);
hdr->subpkt.length = cpu_to_be32(cmd->pos - sizeof(*hdr));
while (cmd->pos % 4) {
if (cmd->pos >= IO_BUFFER_LENGTH) {
pr_debug("Error: Buffer overrun\n");
return -ERANGE;
}
cmd->cmd[cmd->pos++] = 0;
}
hdr->pkt.length = cpu_to_be32(cmd->pos - sizeof(hdr->cp) -
sizeof(hdr->pkt));
hdr->cp.length = cpu_to_be32(cmd->pos - sizeof(hdr->cp));
return 0;
}
static const struct opal_resp_tok *response_get_token(
const struct parsed_resp *resp,
int n)
{
const struct opal_resp_tok *tok;
if (!resp) {
pr_debug("Response is NULL\n");
return ERR_PTR(-EINVAL);
}
if (n >= resp->num) {
pr_debug("Token number doesn't exist: %d, resp: %d\n",
n, resp->num);
return ERR_PTR(-EINVAL);
}
tok = &resp->toks[n];
if (tok->len == 0) {
pr_debug("Token length must be non-zero\n");
return ERR_PTR(-EINVAL);
}
return tok;
}
static ssize_t response_parse_tiny(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = 1;
tok->width = OPAL_WIDTH_TINY;
if (pos[0] & TINY_ATOM_SIGNED) {
tok->type = OPAL_DTA_TOKENID_SINT;
} else {
tok->type = OPAL_DTA_TOKENID_UINT;
tok->stored.u = pos[0] & 0x3f;
}
return tok->len;
}
static ssize_t response_parse_short(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = (pos[0] & SHORT_ATOM_LEN_MASK) + 1;
tok->width = OPAL_WIDTH_SHORT;
if (pos[0] & SHORT_ATOM_BYTESTRING) {
tok->type = OPAL_DTA_TOKENID_BYTESTRING;
} else if (pos[0] & SHORT_ATOM_SIGNED) {
tok->type = OPAL_DTA_TOKENID_SINT;
} else {
u64 u_integer = 0;
ssize_t i, b = 0;
tok->type = OPAL_DTA_TOKENID_UINT;
if (tok->len > 9) {
pr_debug("uint64 with more than 8 bytes\n");
return -EINVAL;
}
for (i = tok->len - 1; i > 0; i--) {
u_integer |= ((u64)pos[i] << (8 * b));
b++;
}
tok->stored.u = u_integer;
}
return tok->len;
}
static ssize_t response_parse_medium(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = (((pos[0] & MEDIUM_ATOM_LEN_MASK) << 8) | pos[1]) + 2;
tok->width = OPAL_WIDTH_MEDIUM;
if (pos[0] & MEDIUM_ATOM_BYTESTRING)
tok->type = OPAL_DTA_TOKENID_BYTESTRING;
else if (pos[0] & MEDIUM_ATOM_SIGNED)
tok->type = OPAL_DTA_TOKENID_SINT;
else
tok->type = OPAL_DTA_TOKENID_UINT;
return tok->len;
}
static ssize_t response_parse_long(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = ((pos[1] << 16) | (pos[2] << 8) | pos[3]) + 4;
tok->width = OPAL_WIDTH_LONG;
if (pos[0] & LONG_ATOM_BYTESTRING)
tok->type = OPAL_DTA_TOKENID_BYTESTRING;
else if (pos[0] & LONG_ATOM_SIGNED)
tok->type = OPAL_DTA_TOKENID_SINT;
else
tok->type = OPAL_DTA_TOKENID_UINT;
return tok->len;
}
static ssize_t response_parse_token(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = 1;
tok->type = OPAL_DTA_TOKENID_TOKEN;
tok->width = OPAL_WIDTH_TOKEN;
return tok->len;
}
static int response_parse(const u8 *buf, size_t length,
struct parsed_resp *resp)
{
const struct opal_header *hdr;
struct opal_resp_tok *iter;
int num_entries = 0;
int total;
ssize_t token_length;
const u8 *pos;
u32 clen, plen, slen;
if (!buf)
return -EFAULT;
if (!resp)
return -EFAULT;
hdr = (struct opal_header *)buf;
pos = buf;
pos += sizeof(*hdr);
clen = be32_to_cpu(hdr->cp.length);
plen = be32_to_cpu(hdr->pkt.length);
slen = be32_to_cpu(hdr->subpkt.length);
pr_debug("Response size: cp: %u, pkt: %u, subpkt: %u\n",
clen, plen, slen);
if (clen == 0 || plen == 0 || slen == 0 ||
slen > IO_BUFFER_LENGTH - sizeof(*hdr)) {
pr_debug("Bad header length. cp: %u, pkt: %u, subpkt: %u\n",
clen, plen, slen);
print_buffer(pos, sizeof(*hdr));
return -EINVAL;
}
if (pos > buf + length)
return -EFAULT;
iter = resp->toks;
total = slen;
print_buffer(pos, total);
while (total > 0) {
if (pos[0] <= TINY_ATOM_BYTE) /* tiny atom */
token_length = response_parse_tiny(iter, pos);
else if (pos[0] <= SHORT_ATOM_BYTE) /* short atom */
token_length = response_parse_short(iter, pos);
else if (pos[0] <= MEDIUM_ATOM_BYTE) /* medium atom */
token_length = response_parse_medium(iter, pos);
else if (pos[0] <= LONG_ATOM_BYTE) /* long atom */
token_length = response_parse_long(iter, pos);
else /* TOKEN */
token_length = response_parse_token(iter, pos);
if (token_length < 0)
return token_length;
pos += token_length;
total -= token_length;
iter++;
num_entries++;
}
resp->num = num_entries;
return 0;
}
static size_t response_get_string(const struct parsed_resp *resp, int n,
const char **store)
{
u8 skip;
const struct opal_resp_tok *tok;
*store = NULL;
tok = response_get_token(resp, n);
if (IS_ERR(tok))
return 0;
if (tok->type != OPAL_DTA_TOKENID_BYTESTRING) {
pr_debug("Token is not a byte string!\n");
return 0;
}
switch (tok->width) {
case OPAL_WIDTH_TINY:
case OPAL_WIDTH_SHORT:
skip = 1;
break;
case OPAL_WIDTH_MEDIUM:
skip = 2;
break;
case OPAL_WIDTH_LONG:
skip = 4;
break;
default:
pr_debug("Token has invalid width!\n");
return 0;
}
*store = tok->pos + skip;
return tok->len - skip;
}
static u64 response_get_u64(const struct parsed_resp *resp, int n)
{
const struct opal_resp_tok *tok;
tok = response_get_token(resp, n);
if (IS_ERR(tok))
return 0;
if (tok->type != OPAL_DTA_TOKENID_UINT) {
pr_debug("Token is not unsigned int: %d\n", tok->type);
return 0;
}
if (tok->width != OPAL_WIDTH_TINY && tok->width != OPAL_WIDTH_SHORT) {
pr_debug("Atom is not short or tiny: %d\n", tok->width);
return 0;
}
return tok->stored.u;
}
static bool response_token_matches(const struct opal_resp_tok *token, u8 match)
{
if (IS_ERR(token) ||
token->type != OPAL_DTA_TOKENID_TOKEN ||
token->pos[0] != match)
return false;
return true;
}
static u8 response_status(const struct parsed_resp *resp)
{
const struct opal_resp_tok *tok;
tok = response_get_token(resp, 0);
if (response_token_matches(tok, OPAL_ENDOFSESSION))
return 0;
if (resp->num < 5)
return DTAERROR_NO_METHOD_STATUS;
tok = response_get_token(resp, resp->num - 5);
if (!response_token_matches(tok, OPAL_STARTLIST))
return DTAERROR_NO_METHOD_STATUS;
tok = response_get_token(resp, resp->num - 1);
if (!response_token_matches(tok, OPAL_ENDLIST))
return DTAERROR_NO_METHOD_STATUS;
return response_get_u64(resp, resp->num - 4);
}