forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 30
/
iop-adma.c
1554 lines (1309 loc) · 42.9 KB
/
iop-adma.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-only
/*
* offload engine driver for the Intel Xscale series of i/o processors
* Copyright © 2006, Intel Corporation.
*/
/*
* This driver supports the asynchrounous DMA copy and RAID engines available
* on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x)
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/prefetch.h>
#include <linux/memory.h>
#include <linux/ioport.h>
#include <linux/raid/pq.h>
#include <linux/slab.h>
#include "iop-adma.h"
#include "dmaengine.h"
#define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common)
#define to_iop_adma_device(dev) \
container_of(dev, struct iop_adma_device, common)
#define tx_to_iop_adma_slot(tx) \
container_of(tx, struct iop_adma_desc_slot, async_tx)
/**
* iop_adma_free_slots - flags descriptor slots for reuse
* @slot: Slot to free
* Caller must hold &iop_chan->lock while calling this function
*/
static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
{
int stride = slot->slots_per_op;
while (stride--) {
slot->slots_per_op = 0;
slot = list_entry(slot->slot_node.next,
struct iop_adma_desc_slot,
slot_node);
}
}
static dma_cookie_t
iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
{
struct dma_async_tx_descriptor *tx = &desc->async_tx;
BUG_ON(tx->cookie < 0);
if (tx->cookie > 0) {
cookie = tx->cookie;
tx->cookie = 0;
/* call the callback (must not sleep or submit new
* operations to this channel)
*/
dmaengine_desc_get_callback_invoke(tx, NULL);
dma_descriptor_unmap(tx);
if (desc->group_head)
desc->group_head = NULL;
}
/* run dependent operations */
dma_run_dependencies(tx);
return cookie;
}
static int
iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
struct iop_adma_chan *iop_chan)
{
/* the client is allowed to attach dependent operations
* until 'ack' is set
*/
if (!async_tx_test_ack(&desc->async_tx))
return 0;
/* leave the last descriptor in the chain
* so we can append to it
*/
if (desc->chain_node.next == &iop_chan->chain)
return 1;
dev_dbg(iop_chan->device->common.dev,
"\tfree slot: %d slots_per_op: %d\n",
desc->idx, desc->slots_per_op);
list_del(&desc->chain_node);
iop_adma_free_slots(desc);
return 0;
}
static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
{
struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
dma_cookie_t cookie = 0;
u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
int busy = iop_chan_is_busy(iop_chan);
int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
/* free completed slots from the chain starting with
* the oldest descriptor
*/
list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
chain_node) {
pr_debug("\tcookie: %d slot: %d busy: %d "
"this_desc: %pad next_desc: %#llx ack: %d\n",
iter->async_tx.cookie, iter->idx, busy,
&iter->async_tx.phys, (u64)iop_desc_get_next_desc(iter),
async_tx_test_ack(&iter->async_tx));
prefetch(_iter);
prefetch(&_iter->async_tx);
/* do not advance past the current descriptor loaded into the
* hardware channel, subsequent descriptors are either in
* process or have not been submitted
*/
if (seen_current)
break;
/* stop the search if we reach the current descriptor and the
* channel is busy, or if it appears that the current descriptor
* needs to be re-read (i.e. has been appended to)
*/
if (iter->async_tx.phys == current_desc) {
BUG_ON(seen_current++);
if (busy || iop_desc_get_next_desc(iter))
break;
}
/* detect the start of a group transaction */
if (!slot_cnt && !slots_per_op) {
slot_cnt = iter->slot_cnt;
slots_per_op = iter->slots_per_op;
if (slot_cnt <= slots_per_op) {
slot_cnt = 0;
slots_per_op = 0;
}
}
if (slot_cnt) {
pr_debug("\tgroup++\n");
if (!grp_start)
grp_start = iter;
slot_cnt -= slots_per_op;
}
/* all the members of a group are complete */
if (slots_per_op != 0 && slot_cnt == 0) {
struct iop_adma_desc_slot *grp_iter, *_grp_iter;
int end_of_chain = 0;
pr_debug("\tgroup end\n");
/* collect the total results */
if (grp_start->xor_check_result) {
u32 zero_sum_result = 0;
slot_cnt = grp_start->slot_cnt;
grp_iter = grp_start;
list_for_each_entry_from(grp_iter,
&iop_chan->chain, chain_node) {
zero_sum_result |=
iop_desc_get_zero_result(grp_iter);
pr_debug("\titer%d result: %d\n",
grp_iter->idx, zero_sum_result);
slot_cnt -= slots_per_op;
if (slot_cnt == 0)
break;
}
pr_debug("\tgrp_start->xor_check_result: %p\n",
grp_start->xor_check_result);
*grp_start->xor_check_result = zero_sum_result;
}
/* clean up the group */
slot_cnt = grp_start->slot_cnt;
grp_iter = grp_start;
list_for_each_entry_safe_from(grp_iter, _grp_iter,
&iop_chan->chain, chain_node) {
cookie = iop_adma_run_tx_complete_actions(
grp_iter, iop_chan, cookie);
slot_cnt -= slots_per_op;
end_of_chain = iop_adma_clean_slot(grp_iter,
iop_chan);
if (slot_cnt == 0 || end_of_chain)
break;
}
/* the group should be complete at this point */
BUG_ON(slot_cnt);
slots_per_op = 0;
grp_start = NULL;
if (end_of_chain)
break;
else
continue;
} else if (slots_per_op) /* wait for group completion */
continue;
/* write back zero sum results (single descriptor case) */
if (iter->xor_check_result && iter->async_tx.cookie)
*iter->xor_check_result =
iop_desc_get_zero_result(iter);
cookie = iop_adma_run_tx_complete_actions(
iter, iop_chan, cookie);
if (iop_adma_clean_slot(iter, iop_chan))
break;
}
if (cookie > 0) {
iop_chan->common.completed_cookie = cookie;
pr_debug("\tcompleted cookie %d\n", cookie);
}
}
static void
iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
{
spin_lock_bh(&iop_chan->lock);
__iop_adma_slot_cleanup(iop_chan);
spin_unlock_bh(&iop_chan->lock);
}
static void iop_adma_tasklet(struct tasklet_struct *t)
{
struct iop_adma_chan *iop_chan = from_tasklet(iop_chan, t,
irq_tasklet);
/* lockdep will flag depedency submissions as potentially
* recursive locking, this is not the case as a dependency
* submission will never recurse a channels submit routine.
* There are checks in async_tx.c to prevent this.
*/
spin_lock_nested(&iop_chan->lock, SINGLE_DEPTH_NESTING);
__iop_adma_slot_cleanup(iop_chan);
spin_unlock(&iop_chan->lock);
}
static struct iop_adma_desc_slot *
iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
int slots_per_op)
{
struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
LIST_HEAD(chain);
int slots_found, retry = 0;
/* start search from the last allocated descrtiptor
* if a contiguous allocation can not be found start searching
* from the beginning of the list
*/
retry:
slots_found = 0;
if (retry == 0)
iter = iop_chan->last_used;
else
iter = list_entry(&iop_chan->all_slots,
struct iop_adma_desc_slot,
slot_node);
list_for_each_entry_safe_continue(
iter, _iter, &iop_chan->all_slots, slot_node) {
prefetch(_iter);
prefetch(&_iter->async_tx);
if (iter->slots_per_op) {
/* give up after finding the first busy slot
* on the second pass through the list
*/
if (retry)
break;
slots_found = 0;
continue;
}
/* start the allocation if the slot is correctly aligned */
if (!slots_found++) {
if (iop_desc_is_aligned(iter, slots_per_op))
alloc_start = iter;
else {
slots_found = 0;
continue;
}
}
if (slots_found == num_slots) {
struct iop_adma_desc_slot *alloc_tail = NULL;
struct iop_adma_desc_slot *last_used = NULL;
iter = alloc_start;
while (num_slots) {
int i;
dev_dbg(iop_chan->device->common.dev,
"allocated slot: %d "
"(desc %p phys: %#llx) slots_per_op %d\n",
iter->idx, iter->hw_desc,
(u64)iter->async_tx.phys, slots_per_op);
/* pre-ack all but the last descriptor */
if (num_slots != slots_per_op)
async_tx_ack(&iter->async_tx);
list_add_tail(&iter->chain_node, &chain);
alloc_tail = iter;
iter->async_tx.cookie = 0;
iter->slot_cnt = num_slots;
iter->xor_check_result = NULL;
for (i = 0; i < slots_per_op; i++) {
iter->slots_per_op = slots_per_op - i;
last_used = iter;
iter = list_entry(iter->slot_node.next,
struct iop_adma_desc_slot,
slot_node);
}
num_slots -= slots_per_op;
}
alloc_tail->group_head = alloc_start;
alloc_tail->async_tx.cookie = -EBUSY;
list_splice(&chain, &alloc_tail->tx_list);
iop_chan->last_used = last_used;
iop_desc_clear_next_desc(alloc_start);
iop_desc_clear_next_desc(alloc_tail);
return alloc_tail;
}
}
if (!retry++)
goto retry;
/* perform direct reclaim if the allocation fails */
__iop_adma_slot_cleanup(iop_chan);
return NULL;
}
static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
{
dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
iop_chan->pending);
if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
iop_chan->pending = 0;
iop_chan_append(iop_chan);
}
}
static dma_cookie_t
iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
struct iop_adma_desc_slot *grp_start, *old_chain_tail;
int slot_cnt;
dma_cookie_t cookie;
dma_addr_t next_dma;
grp_start = sw_desc->group_head;
slot_cnt = grp_start->slot_cnt;
spin_lock_bh(&iop_chan->lock);
cookie = dma_cookie_assign(tx);
old_chain_tail = list_entry(iop_chan->chain.prev,
struct iop_adma_desc_slot, chain_node);
list_splice_init(&sw_desc->tx_list,
&old_chain_tail->chain_node);
/* fix up the hardware chain */
next_dma = grp_start->async_tx.phys;
iop_desc_set_next_desc(old_chain_tail, next_dma);
BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */
/* check for pre-chained descriptors */
iop_paranoia(iop_desc_get_next_desc(sw_desc));
/* increment the pending count by the number of slots
* memcpy operations have a 1:1 (slot:operation) relation
* other operations are heavier and will pop the threshold
* more often.
*/
iop_chan->pending += slot_cnt;
iop_adma_check_threshold(iop_chan);
spin_unlock_bh(&iop_chan->lock);
dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
__func__, sw_desc->async_tx.cookie, sw_desc->idx);
return cookie;
}
static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
/**
* iop_adma_alloc_chan_resources - returns the number of allocated descriptors
* @chan: allocate descriptor resources for this channel
*
* Note: We keep the slots for 1 operation on iop_chan->chain at all times. To
* avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
* greater than 2x the number slots needed to satisfy a device->max_xor
* request.
* */
static int iop_adma_alloc_chan_resources(struct dma_chan *chan)
{
char *hw_desc;
dma_addr_t dma_desc;
int idx;
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *slot = NULL;
int init = iop_chan->slots_allocated ? 0 : 1;
struct iop_adma_platform_data *plat_data =
dev_get_platdata(&iop_chan->device->pdev->dev);
int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
/* Allocate descriptor slots */
do {
idx = iop_chan->slots_allocated;
if (idx == num_descs_in_pool)
break;
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot) {
printk(KERN_INFO "IOP ADMA Channel only initialized"
" %d descriptor slots", idx);
break;
}
hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
dma_async_tx_descriptor_init(&slot->async_tx, chan);
slot->async_tx.tx_submit = iop_adma_tx_submit;
INIT_LIST_HEAD(&slot->tx_list);
INIT_LIST_HEAD(&slot->chain_node);
INIT_LIST_HEAD(&slot->slot_node);
dma_desc = iop_chan->device->dma_desc_pool;
slot->async_tx.phys = dma_desc + idx * IOP_ADMA_SLOT_SIZE;
slot->idx = idx;
spin_lock_bh(&iop_chan->lock);
iop_chan->slots_allocated++;
list_add_tail(&slot->slot_node, &iop_chan->all_slots);
spin_unlock_bh(&iop_chan->lock);
} while (iop_chan->slots_allocated < num_descs_in_pool);
if (idx && !iop_chan->last_used)
iop_chan->last_used = list_entry(iop_chan->all_slots.next,
struct iop_adma_desc_slot,
slot_node);
dev_dbg(iop_chan->device->common.dev,
"allocated %d descriptor slots last_used: %p\n",
iop_chan->slots_allocated, iop_chan->last_used);
/* initialize the channel and the chain with a null operation */
if (init) {
if (dma_has_cap(DMA_MEMCPY,
iop_chan->device->common.cap_mask))
iop_chan_start_null_memcpy(iop_chan);
else if (dma_has_cap(DMA_XOR,
iop_chan->device->common.cap_mask))
iop_chan_start_null_xor(iop_chan);
else
BUG();
}
return (idx > 0) ? idx : -ENOMEM;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *grp_start;
int slot_cnt, slots_per_op;
dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
grp_start = sw_desc->group_head;
iop_desc_init_interrupt(grp_start, iop_chan);
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
dma_addr_t dma_src, size_t len, unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *grp_start;
int slot_cnt, slots_per_op;
if (unlikely(!len))
return NULL;
BUG_ON(len > IOP_ADMA_MAX_BYTE_COUNT);
dev_dbg(iop_chan->device->common.dev, "%s len: %zu\n",
__func__, len);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
grp_start = sw_desc->group_head;
iop_desc_init_memcpy(grp_start, flags);
iop_desc_set_byte_count(grp_start, iop_chan, len);
iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
iop_desc_set_memcpy_src_addr(grp_start, dma_src);
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *grp_start;
int slot_cnt, slots_per_op;
if (unlikely(!len))
return NULL;
BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
dev_dbg(iop_chan->device->common.dev,
"%s src_cnt: %d len: %zu flags: %lx\n",
__func__, src_cnt, len, flags);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
grp_start = sw_desc->group_head;
iop_desc_init_xor(grp_start, src_cnt, flags);
iop_desc_set_byte_count(grp_start, iop_chan, len);
iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
sw_desc->async_tx.flags = flags;
while (src_cnt--)
iop_desc_set_xor_src_addr(grp_start, src_cnt,
dma_src[src_cnt]);
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src,
unsigned int src_cnt, size_t len, u32 *result,
unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *grp_start;
int slot_cnt, slots_per_op;
if (unlikely(!len))
return NULL;
dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %zu\n",
__func__, src_cnt, len);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
grp_start = sw_desc->group_head;
iop_desc_init_zero_sum(grp_start, src_cnt, flags);
iop_desc_set_zero_sum_byte_count(grp_start, len);
grp_start->xor_check_result = result;
pr_debug("\t%s: grp_start->xor_check_result: %p\n",
__func__, grp_start->xor_check_result);
sw_desc->async_tx.flags = flags;
while (src_cnt--)
iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
dma_src[src_cnt]);
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf, size_t len,
unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *g;
int slot_cnt, slots_per_op;
int continue_srcs;
if (unlikely(!len))
return NULL;
BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
dev_dbg(iop_chan->device->common.dev,
"%s src_cnt: %d len: %zu flags: %lx\n",
__func__, src_cnt, len, flags);
if (dmaf_p_disabled_continue(flags))
continue_srcs = 1+src_cnt;
else if (dmaf_continue(flags))
continue_srcs = 3+src_cnt;
else
continue_srcs = 0+src_cnt;
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_pq_slot_count(len, continue_srcs, &slots_per_op);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
int i;
g = sw_desc->group_head;
iop_desc_set_byte_count(g, iop_chan, len);
/* even if P is disabled its destination address (bits
* [3:0]) must match Q. It is ok if P points to an
* invalid address, it won't be written.
*/
if (flags & DMA_PREP_PQ_DISABLE_P)
dst[0] = dst[1] & 0x7;
iop_desc_set_pq_addr(g, dst);
sw_desc->async_tx.flags = flags;
for (i = 0; i < src_cnt; i++)
iop_desc_set_pq_src_addr(g, i, src[i], scf[i]);
/* if we are continuing a previous operation factor in
* the old p and q values, see the comment for dma_maxpq
* in include/linux/dmaengine.h
*/
if (dmaf_p_disabled_continue(flags))
iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
else if (dmaf_continue(flags)) {
iop_desc_set_pq_src_addr(g, i++, dst[0], 0);
iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
iop_desc_set_pq_src_addr(g, i++, dst[1], 0);
}
iop_desc_init_pq(g, i, flags);
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf,
size_t len, enum sum_check_flags *pqres,
unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *g;
int slot_cnt, slots_per_op;
if (unlikely(!len))
return NULL;
BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %zu\n",
__func__, src_cnt, len);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_pq_zero_sum_slot_count(len, src_cnt + 2, &slots_per_op);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
/* for validate operations p and q are tagged onto the
* end of the source list
*/
int pq_idx = src_cnt;
g = sw_desc->group_head;
iop_desc_init_pq_zero_sum(g, src_cnt+2, flags);
iop_desc_set_pq_zero_sum_byte_count(g, len);
g->pq_check_result = pqres;
pr_debug("\t%s: g->pq_check_result: %p\n",
__func__, g->pq_check_result);
sw_desc->async_tx.flags = flags;
while (src_cnt--)
iop_desc_set_pq_zero_sum_src_addr(g, src_cnt,
src[src_cnt],
scf[src_cnt]);
iop_desc_set_pq_zero_sum_addr(g, pq_idx, src);
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static void iop_adma_free_chan_resources(struct dma_chan *chan)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *iter, *_iter;
int in_use_descs = 0;
iop_adma_slot_cleanup(iop_chan);
spin_lock_bh(&iop_chan->lock);
list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
chain_node) {
in_use_descs++;
list_del(&iter->chain_node);
}
list_for_each_entry_safe_reverse(
iter, _iter, &iop_chan->all_slots, slot_node) {
list_del(&iter->slot_node);
kfree(iter);
iop_chan->slots_allocated--;
}
iop_chan->last_used = NULL;
dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
__func__, iop_chan->slots_allocated);
spin_unlock_bh(&iop_chan->lock);
/* one is ok since we left it on there on purpose */
if (in_use_descs > 1)
printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
in_use_descs - 1);
}
/**
* iop_adma_status - poll the status of an ADMA transaction
* @chan: ADMA channel handle
* @cookie: ADMA transaction identifier
* @txstate: a holder for the current state of the channel or NULL
*/
static enum dma_status iop_adma_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
int ret;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
iop_adma_slot_cleanup(iop_chan);
return dma_cookie_status(chan, cookie, txstate);
}
static irqreturn_t iop_adma_eot_handler(int irq, void *data)
{
struct iop_adma_chan *chan = data;
dev_dbg(chan->device->common.dev, "%s\n", __func__);
tasklet_schedule(&chan->irq_tasklet);
iop_adma_device_clear_eot_status(chan);
return IRQ_HANDLED;
}
static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
{
struct iop_adma_chan *chan = data;
dev_dbg(chan->device->common.dev, "%s\n", __func__);
tasklet_schedule(&chan->irq_tasklet);
iop_adma_device_clear_eoc_status(chan);
return IRQ_HANDLED;
}
static irqreturn_t iop_adma_err_handler(int irq, void *data)
{
struct iop_adma_chan *chan = data;
unsigned long status = iop_chan_get_status(chan);
dev_err(chan->device->common.dev,
"error ( %s%s%s%s%s%s%s)\n",
iop_is_err_int_parity(status, chan) ? "int_parity " : "",
iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
iop_is_err_split_tx(status, chan) ? "split_tx " : "");
iop_adma_device_clear_err_status(chan);
BUG();
return IRQ_HANDLED;
}
static void iop_adma_issue_pending(struct dma_chan *chan)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
if (iop_chan->pending) {
iop_chan->pending = 0;
iop_chan_append(iop_chan);
}
}
/*
* Perform a transaction to verify the HW works.
*/
#define IOP_ADMA_TEST_SIZE 2000
static int iop_adma_memcpy_self_test(struct iop_adma_device *device)
{
int i;
void *src, *dest;
dma_addr_t src_dma, dest_dma;
struct dma_chan *dma_chan;
dma_cookie_t cookie;
struct dma_async_tx_descriptor *tx;
int err = 0;
struct iop_adma_chan *iop_chan;
dev_dbg(device->common.dev, "%s\n", __func__);
src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
if (!src)
return -ENOMEM;
dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
if (!dest) {
kfree(src);
return -ENOMEM;
}
/* Fill in src buffer */
for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
((u8 *) src)[i] = (u8)i;
/* Start copy, using first DMA channel */
dma_chan = container_of(device->common.channels.next,
struct dma_chan,
device_node);
if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
err = -ENODEV;
goto out;
}
dest_dma = dma_map_single(dma_chan->device->dev, dest,
IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
src_dma = dma_map_single(dma_chan->device->dev, src,
IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
IOP_ADMA_TEST_SIZE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
cookie = iop_adma_tx_submit(tx);
iop_adma_issue_pending(dma_chan);
msleep(1);
if (iop_adma_status(dma_chan, cookie, NULL) !=
DMA_COMPLETE) {
dev_err(dma_chan->device->dev,
"Self-test copy timed out, disabling\n");
err = -ENODEV;
goto free_resources;
}
iop_chan = to_iop_adma_chan(dma_chan);
dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
dev_err(dma_chan->device->dev,
"Self-test copy failed compare, disabling\n");
err = -ENODEV;
goto free_resources;
}
free_resources:
iop_adma_free_chan_resources(dma_chan);
out:
kfree(src);
kfree(dest);
return err;
}
#define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
static int
iop_adma_xor_val_self_test(struct iop_adma_device *device)
{
int i, src_idx;
struct page *dest;
struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
dma_addr_t dest_dma;
struct dma_async_tx_descriptor *tx;
struct dma_chan *dma_chan;
dma_cookie_t cookie;
u8 cmp_byte = 0;
u32 cmp_word;
u32 zero_sum_result;
int err = 0;
struct iop_adma_chan *iop_chan;
dev_dbg(device->common.dev, "%s\n", __func__);
for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
if (!xor_srcs[src_idx]) {
while (src_idx--)
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
}
dest = alloc_page(GFP_KERNEL);
if (!dest) {
while (src_idx--)
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
/* Fill in src buffers */
for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
u8 *ptr = page_address(xor_srcs[src_idx]);
for (i = 0; i < PAGE_SIZE; i++)
ptr[i] = (1 << src_idx);
}
for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
cmp_byte ^= (u8) (1 << src_idx);
cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
(cmp_byte << 8) | cmp_byte;
memset(page_address(dest), 0, PAGE_SIZE);
dma_chan = container_of(device->common.channels.next,
struct dma_chan,
device_node);
if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
err = -ENODEV;
goto out;
}
/* test xor */
dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
PAGE_SIZE, DMA_FROM_DEVICE);
for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
0, PAGE_SIZE, DMA_TO_DEVICE);
tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
cookie = iop_adma_tx_submit(tx);
iop_adma_issue_pending(dma_chan);
msleep(8);
if (iop_adma_status(dma_chan, cookie, NULL) !=
DMA_COMPLETE) {
dev_err(dma_chan->device->dev,
"Self-test xor timed out, disabling\n");
err = -ENODEV;
goto free_resources;
}
iop_chan = to_iop_adma_chan(dma_chan);
dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
PAGE_SIZE, DMA_FROM_DEVICE);
for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
u32 *ptr = page_address(dest);
if (ptr[i] != cmp_word) {
dev_err(dma_chan->device->dev,
"Self-test xor failed compare, disabling\n");
err = -ENODEV;
goto free_resources;
}
}
dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
PAGE_SIZE, DMA_TO_DEVICE);