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7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/err.h>
11#include <linux/delay.h>
12#include <linux/dma-mapping.h>
13#include <linux/dmaengine.h>
14#include <linux/freezer.h>
15#include <linux/init.h>
16#include <linux/kthread.h>
17#include <linux/sched/task.h>
18#include <linux/module.h>
19#include <linux/moduleparam.h>
20#include <linux/random.h>
21#include <linux/slab.h>
22#include <linux/wait.h>
23
24static unsigned int test_buf_size = 16384;
25module_param(test_buf_size, uint, S_IRUGO | S_IWUSR);
26MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
27
28static char test_device[32];
29module_param_string(device, test_device, sizeof(test_device),
30 S_IRUGO | S_IWUSR);
31MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
32
33static unsigned int threads_per_chan = 1;
34module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR);
35MODULE_PARM_DESC(threads_per_chan,
36 "Number of threads to start per channel (default: 1)");
37
38static unsigned int max_channels;
39module_param(max_channels, uint, S_IRUGO | S_IWUSR);
40MODULE_PARM_DESC(max_channels,
41 "Maximum number of channels to use (default: all)");
42
43static unsigned int iterations;
44module_param(iterations, uint, S_IRUGO | S_IWUSR);
45MODULE_PARM_DESC(iterations,
46 "Iterations before stopping test (default: infinite)");
47
48static unsigned int dmatest;
49module_param(dmatest, uint, S_IRUGO | S_IWUSR);
50MODULE_PARM_DESC(dmatest,
51 "dmatest 0-memcpy 1-memset (default: 0)");
52
53static unsigned int xor_sources = 3;
54module_param(xor_sources, uint, S_IRUGO | S_IWUSR);
55MODULE_PARM_DESC(xor_sources,
56 "Number of xor source buffers (default: 3)");
57
58static unsigned int pq_sources = 3;
59module_param(pq_sources, uint, S_IRUGO | S_IWUSR);
60MODULE_PARM_DESC(pq_sources,
61 "Number of p+q source buffers (default: 3)");
62
63static int timeout = 3000;
64module_param(timeout, int, S_IRUGO | S_IWUSR);
65MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
66 "Pass -1 for infinite timeout");
67
68static bool noverify;
69module_param(noverify, bool, S_IRUGO | S_IWUSR);
70MODULE_PARM_DESC(noverify, "Disable data verification (default: verify)");
71
72static bool norandom;
73module_param(norandom, bool, 0644);
74MODULE_PARM_DESC(norandom, "Disable random offset setup (default: random)");
75
76static bool verbose;
77module_param(verbose, bool, S_IRUGO | S_IWUSR);
78MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)");
79
80static int alignment = -1;
81module_param(alignment, int, 0644);
82MODULE_PARM_DESC(alignment, "Custom data address alignment taken as 2^(alignment) (default: not used (-1))");
83
84static unsigned int transfer_size;
85module_param(transfer_size, uint, 0644);
86MODULE_PARM_DESC(transfer_size, "Optional custom transfer size in bytes (default: not used (0))");
87
88static bool polled;
89module_param(polled, bool, S_IRUGO | S_IWUSR);
90MODULE_PARM_DESC(polled, "Use polling for completion instead of interrupts");
91
92
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101
102
103
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106
107
108
109struct dmatest_params {
110 unsigned int buf_size;
111 char channel[20];
112 char device[32];
113 unsigned int threads_per_chan;
114 unsigned int max_channels;
115 unsigned int iterations;
116 unsigned int xor_sources;
117 unsigned int pq_sources;
118 int timeout;
119 bool noverify;
120 bool norandom;
121 int alignment;
122 unsigned int transfer_size;
123 bool polled;
124};
125
126
127
128
129
130
131
132
133
134
135static struct dmatest_info {
136
137 struct dmatest_params params;
138
139
140 struct list_head channels;
141 unsigned int nr_channels;
142 int last_error;
143 struct mutex lock;
144 bool did_init;
145} test_info = {
146 .channels = LIST_HEAD_INIT(test_info.channels),
147 .lock = __MUTEX_INITIALIZER(test_info.lock),
148};
149
150static int dmatest_run_set(const char *val, const struct kernel_param *kp);
151static int dmatest_run_get(char *val, const struct kernel_param *kp);
152static const struct kernel_param_ops run_ops = {
153 .set = dmatest_run_set,
154 .get = dmatest_run_get,
155};
156static bool dmatest_run;
157module_param_cb(run, &run_ops, &dmatest_run, S_IRUGO | S_IWUSR);
158MODULE_PARM_DESC(run, "Run the test (default: false)");
159
160static int dmatest_chan_set(const char *val, const struct kernel_param *kp);
161static int dmatest_chan_get(char *val, const struct kernel_param *kp);
162static const struct kernel_param_ops multi_chan_ops = {
163 .set = dmatest_chan_set,
164 .get = dmatest_chan_get,
165};
166
167static char test_channel[20];
168static struct kparam_string newchan_kps = {
169 .string = test_channel,
170 .maxlen = 20,
171};
172module_param_cb(channel, &multi_chan_ops, &newchan_kps, 0644);
173MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
174
175static int dmatest_test_list_get(char *val, const struct kernel_param *kp);
176static const struct kernel_param_ops test_list_ops = {
177 .get = dmatest_test_list_get,
178};
179module_param_cb(test_list, &test_list_ops, NULL, 0444);
180MODULE_PARM_DESC(test_list, "Print current test list");
181
182
183#define MAX_ERROR_COUNT 32
184
185
186
187
188
189
190
191
192
193
194
195
196#define PATTERN_SRC 0x80
197#define PATTERN_DST 0x00
198#define PATTERN_COPY 0x40
199#define PATTERN_OVERWRITE 0x20
200#define PATTERN_COUNT_MASK 0x1f
201#define PATTERN_MEMSET_IDX 0x01
202
203
204#define FIXPT_SHIFT 8
205#define FIXPNT_MASK 0xFF
206#define FIXPT_TO_INT(a) ((a) >> FIXPT_SHIFT)
207#define INT_TO_FIXPT(a) ((a) << FIXPT_SHIFT)
208#define FIXPT_GET_FRAC(a) ((((a) & FIXPNT_MASK) * 100) >> FIXPT_SHIFT)
209
210
211struct dmatest_done {
212 bool done;
213 wait_queue_head_t *wait;
214};
215
216struct dmatest_data {
217 u8 **raw;
218 u8 **aligned;
219 unsigned int cnt;
220 unsigned int off;
221};
222
223struct dmatest_thread {
224 struct list_head node;
225 struct dmatest_info *info;
226 struct task_struct *task;
227 struct dma_chan *chan;
228 struct dmatest_data src;
229 struct dmatest_data dst;
230 enum dma_transaction_type type;
231 wait_queue_head_t done_wait;
232 struct dmatest_done test_done;
233 bool done;
234 bool pending;
235};
236
237struct dmatest_chan {
238 struct list_head node;
239 struct dma_chan *chan;
240 struct list_head threads;
241};
242
243static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
244static bool wait;
245
246static bool is_threaded_test_run(struct dmatest_info *info)
247{
248 struct dmatest_chan *dtc;
249
250 list_for_each_entry(dtc, &info->channels, node) {
251 struct dmatest_thread *thread;
252
253 list_for_each_entry(thread, &dtc->threads, node) {
254 if (!thread->done && !thread->pending)
255 return true;
256 }
257 }
258
259 return false;
260}
261
262static bool is_threaded_test_pending(struct dmatest_info *info)
263{
264 struct dmatest_chan *dtc;
265
266 list_for_each_entry(dtc, &info->channels, node) {
267 struct dmatest_thread *thread;
268
269 list_for_each_entry(thread, &dtc->threads, node) {
270 if (thread->pending)
271 return true;
272 }
273 }
274
275 return false;
276}
277
278static int dmatest_wait_get(char *val, const struct kernel_param *kp)
279{
280 struct dmatest_info *info = &test_info;
281 struct dmatest_params *params = &info->params;
282
283 if (params->iterations)
284 wait_event(thread_wait, !is_threaded_test_run(info));
285 wait = true;
286 return param_get_bool(val, kp);
287}
288
289static const struct kernel_param_ops wait_ops = {
290 .get = dmatest_wait_get,
291 .set = param_set_bool,
292};
293module_param_cb(wait, &wait_ops, &wait, S_IRUGO);
294MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)");
295
296static bool dmatest_match_channel(struct dmatest_params *params,
297 struct dma_chan *chan)
298{
299 if (params->channel[0] == '\0')
300 return true;
301 return strcmp(dma_chan_name(chan), params->channel) == 0;
302}
303
304static bool dmatest_match_device(struct dmatest_params *params,
305 struct dma_device *device)
306{
307 if (params->device[0] == '\0')
308 return true;
309 return strcmp(dev_name(device->dev), params->device) == 0;
310}
311
312static unsigned long dmatest_random(void)
313{
314 unsigned long buf;
315
316 prandom_bytes(&buf, sizeof(buf));
317 return buf;
318}
319
320static inline u8 gen_inv_idx(u8 index, bool is_memset)
321{
322 u8 val = is_memset ? PATTERN_MEMSET_IDX : index;
323
324 return ~val & PATTERN_COUNT_MASK;
325}
326
327static inline u8 gen_src_value(u8 index, bool is_memset)
328{
329 return PATTERN_SRC | gen_inv_idx(index, is_memset);
330}
331
332static inline u8 gen_dst_value(u8 index, bool is_memset)
333{
334 return PATTERN_DST | gen_inv_idx(index, is_memset);
335}
336
337static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
338 unsigned int buf_size, bool is_memset)
339{
340 unsigned int i;
341 u8 *buf;
342
343 for (; (buf = *bufs); bufs++) {
344 for (i = 0; i < start; i++)
345 buf[i] = gen_src_value(i, is_memset);
346 for ( ; i < start + len; i++)
347 buf[i] = gen_src_value(i, is_memset) | PATTERN_COPY;
348 for ( ; i < buf_size; i++)
349 buf[i] = gen_src_value(i, is_memset);
350 buf++;
351 }
352}
353
354static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
355 unsigned int buf_size, bool is_memset)
356{
357 unsigned int i;
358 u8 *buf;
359
360 for (; (buf = *bufs); bufs++) {
361 for (i = 0; i < start; i++)
362 buf[i] = gen_dst_value(i, is_memset);
363 for ( ; i < start + len; i++)
364 buf[i] = gen_dst_value(i, is_memset) |
365 PATTERN_OVERWRITE;
366 for ( ; i < buf_size; i++)
367 buf[i] = gen_dst_value(i, is_memset);
368 }
369}
370
371static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
372 unsigned int counter, bool is_srcbuf, bool is_memset)
373{
374 u8 diff = actual ^ pattern;
375 u8 expected = pattern | gen_inv_idx(counter, is_memset);
376 const char *thread_name = current->comm;
377
378 if (is_srcbuf)
379 pr_warn("%s: srcbuf[0x%x] overwritten! Expected %02x, got %02x\n",
380 thread_name, index, expected, actual);
381 else if ((pattern & PATTERN_COPY)
382 && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
383 pr_warn("%s: dstbuf[0x%x] not copied! Expected %02x, got %02x\n",
384 thread_name, index, expected, actual);
385 else if (diff & PATTERN_SRC)
386 pr_warn("%s: dstbuf[0x%x] was copied! Expected %02x, got %02x\n",
387 thread_name, index, expected, actual);
388 else
389 pr_warn("%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n",
390 thread_name, index, expected, actual);
391}
392
393static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
394 unsigned int end, unsigned int counter, u8 pattern,
395 bool is_srcbuf, bool is_memset)
396{
397 unsigned int i;
398 unsigned int error_count = 0;
399 u8 actual;
400 u8 expected;
401 u8 *buf;
402 unsigned int counter_orig = counter;
403
404 for (; (buf = *bufs); bufs++) {
405 counter = counter_orig;
406 for (i = start; i < end; i++) {
407 actual = buf[i];
408 expected = pattern | gen_inv_idx(counter, is_memset);
409 if (actual != expected) {
410 if (error_count < MAX_ERROR_COUNT)
411 dmatest_mismatch(actual, pattern, i,
412 counter, is_srcbuf,
413 is_memset);
414 error_count++;
415 }
416 counter++;
417 }
418 }
419
420 if (error_count > MAX_ERROR_COUNT)
421 pr_warn("%s: %u errors suppressed\n",
422 current->comm, error_count - MAX_ERROR_COUNT);
423
424 return error_count;
425}
426
427
428static void dmatest_callback(void *arg)
429{
430 struct dmatest_done *done = arg;
431 struct dmatest_thread *thread =
432 container_of(done, struct dmatest_thread, test_done);
433 if (!thread->done) {
434 done->done = true;
435 wake_up_all(done->wait);
436 } else {
437
438
439
440
441
442
443
444 WARN(1, "dmatest: Kernel memory may be corrupted!!\n");
445 }
446}
447
448static unsigned int min_odd(unsigned int x, unsigned int y)
449{
450 unsigned int val = min(x, y);
451
452 return val % 2 ? val : val - 1;
453}
454
455static void result(const char *err, unsigned int n, unsigned int src_off,
456 unsigned int dst_off, unsigned int len, unsigned long data)
457{
458 if (IS_ERR_VALUE(data)) {
459 pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%ld)\n",
460 current->comm, n, err, src_off, dst_off, len, data);
461 } else {
462 pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
463 current->comm, n, err, src_off, dst_off, len, data);
464 }
465}
466
467static void dbg_result(const char *err, unsigned int n, unsigned int src_off,
468 unsigned int dst_off, unsigned int len,
469 unsigned long data)
470{
471 pr_debug("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
472 current->comm, n, err, src_off, dst_off, len, data);
473}
474
475#define verbose_result(err, n, src_off, dst_off, len, data) ({ \
476 if (verbose) \
477 result(err, n, src_off, dst_off, len, data); \
478 else \
479 dbg_result(err, n, src_off, dst_off, len, data);\
480})
481
482static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
483{
484 unsigned long long per_sec = 1000000;
485
486 if (runtime <= 0)
487 return 0;
488
489
490 while (runtime > UINT_MAX) {
491 runtime >>= 1;
492 per_sec <<= 1;
493 }
494
495 per_sec *= val;
496 per_sec = INT_TO_FIXPT(per_sec);
497 do_div(per_sec, runtime);
498
499 return per_sec;
500}
501
502static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
503{
504 return FIXPT_TO_INT(dmatest_persec(runtime, len >> 10));
505}
506
507static void __dmatest_free_test_data(struct dmatest_data *d, unsigned int cnt)
508{
509 unsigned int i;
510
511 for (i = 0; i < cnt; i++)
512 kfree(d->raw[i]);
513
514 kfree(d->aligned);
515 kfree(d->raw);
516}
517
518static void dmatest_free_test_data(struct dmatest_data *d)
519{
520 __dmatest_free_test_data(d, d->cnt);
521}
522
523static int dmatest_alloc_test_data(struct dmatest_data *d,
524 unsigned int buf_size, u8 align)
525{
526 unsigned int i = 0;
527
528 d->raw = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
529 if (!d->raw)
530 return -ENOMEM;
531
532 d->aligned = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
533 if (!d->aligned)
534 goto err;
535
536 for (i = 0; i < d->cnt; i++) {
537 d->raw[i] = kmalloc(buf_size + align, GFP_KERNEL);
538 if (!d->raw[i])
539 goto err;
540
541
542 if (align)
543 d->aligned[i] = PTR_ALIGN(d->raw[i], align);
544 else
545 d->aligned[i] = d->raw[i];
546 }
547
548 return 0;
549err:
550 __dmatest_free_test_data(d, i);
551 return -ENOMEM;
552}
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568static int dmatest_func(void *data)
569{
570 struct dmatest_thread *thread = data;
571 struct dmatest_done *done = &thread->test_done;
572 struct dmatest_info *info;
573 struct dmatest_params *params;
574 struct dma_chan *chan;
575 struct dma_device *dev;
576 unsigned int error_count;
577 unsigned int failed_tests = 0;
578 unsigned int total_tests = 0;
579 dma_cookie_t cookie;
580 enum dma_status status;
581 enum dma_ctrl_flags flags;
582 u8 *pq_coefs = NULL;
583 int ret;
584 unsigned int buf_size;
585 struct dmatest_data *src;
586 struct dmatest_data *dst;
587 int i;
588 ktime_t ktime, start, diff;
589 ktime_t filltime = 0;
590 ktime_t comparetime = 0;
591 s64 runtime = 0;
592 unsigned long long total_len = 0;
593 unsigned long long iops = 0;
594 u8 align = 0;
595 bool is_memset = false;
596 dma_addr_t *srcs;
597 dma_addr_t *dma_pq;
598
599 set_freezable();
600
601 ret = -ENOMEM;
602
603 smp_rmb();
604 thread->pending = false;
605 info = thread->info;
606 params = &info->params;
607 chan = thread->chan;
608 dev = chan->device;
609 src = &thread->src;
610 dst = &thread->dst;
611 if (thread->type == DMA_MEMCPY) {
612 align = params->alignment < 0 ? dev->copy_align :
613 params->alignment;
614 src->cnt = dst->cnt = 1;
615 } else if (thread->type == DMA_MEMSET) {
616 align = params->alignment < 0 ? dev->fill_align :
617 params->alignment;
618 src->cnt = dst->cnt = 1;
619 is_memset = true;
620 } else if (thread->type == DMA_XOR) {
621
622 src->cnt = min_odd(params->xor_sources | 1, dev->max_xor);
623 dst->cnt = 1;
624 align = params->alignment < 0 ? dev->xor_align :
625 params->alignment;
626 } else if (thread->type == DMA_PQ) {
627
628 src->cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
629 dst->cnt = 2;
630 align = params->alignment < 0 ? dev->pq_align :
631 params->alignment;
632
633 pq_coefs = kmalloc(params->pq_sources + 1, GFP_KERNEL);
634 if (!pq_coefs)
635 goto err_thread_type;
636
637 for (i = 0; i < src->cnt; i++)
638 pq_coefs[i] = 1;
639 } else
640 goto err_thread_type;
641
642
643 if ((src->cnt + dst->cnt) >= 255) {
644 pr_err("too many buffers (%d of 255 supported)\n",
645 src->cnt + dst->cnt);
646 goto err_free_coefs;
647 }
648
649 buf_size = params->buf_size;
650 if (1 << align > buf_size) {
651 pr_err("%u-byte buffer too small for %d-byte alignment\n",
652 buf_size, 1 << align);
653 goto err_free_coefs;
654 }
655
656 if (dmatest_alloc_test_data(src, buf_size, align) < 0)
657 goto err_free_coefs;
658
659 if (dmatest_alloc_test_data(dst, buf_size, align) < 0)
660 goto err_src;
661
662 set_user_nice(current, 10);
663
664 srcs = kcalloc(src->cnt, sizeof(dma_addr_t), GFP_KERNEL);
665 if (!srcs)
666 goto err_dst;
667
668 dma_pq = kcalloc(dst->cnt, sizeof(dma_addr_t), GFP_KERNEL);
669 if (!dma_pq)
670 goto err_srcs_array;
671
672
673
674
675 if (params->polled)
676 flags = DMA_CTRL_ACK;
677 else
678 flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
679
680 ktime = ktime_get();
681 while (!(kthread_should_stop() ||
682 (params->iterations && total_tests >= params->iterations))) {
683 struct dma_async_tx_descriptor *tx = NULL;
684 struct dmaengine_unmap_data *um;
685 dma_addr_t *dsts;
686 unsigned int len;
687
688 total_tests++;
689
690 if (params->transfer_size) {
691 if (params->transfer_size >= buf_size) {
692 pr_err("%u-byte transfer size must be lower than %u-buffer size\n",
693 params->transfer_size, buf_size);
694 break;
695 }
696 len = params->transfer_size;
697 } else if (params->norandom) {
698 len = buf_size;
699 } else {
700 len = dmatest_random() % buf_size + 1;
701 }
702
703
704 if (!params->transfer_size) {
705 len = (len >> align) << align;
706 if (!len)
707 len = 1 << align;
708 }
709 total_len += len;
710
711 if (params->norandom) {
712 src->off = 0;
713 dst->off = 0;
714 } else {
715 src->off = dmatest_random() % (buf_size - len + 1);
716 dst->off = dmatest_random() % (buf_size - len + 1);
717
718 src->off = (src->off >> align) << align;
719 dst->off = (dst->off >> align) << align;
720 }
721
722 if (!params->noverify) {
723 start = ktime_get();
724 dmatest_init_srcs(src->aligned, src->off, len,
725 buf_size, is_memset);
726 dmatest_init_dsts(dst->aligned, dst->off, len,
727 buf_size, is_memset);
728
729 diff = ktime_sub(ktime_get(), start);
730 filltime = ktime_add(filltime, diff);
731 }
732
733 um = dmaengine_get_unmap_data(dev->dev, src->cnt + dst->cnt,
734 GFP_KERNEL);
735 if (!um) {
736 failed_tests++;
737 result("unmap data NULL", total_tests,
738 src->off, dst->off, len, ret);
739 continue;
740 }
741
742 um->len = buf_size;
743 for (i = 0; i < src->cnt; i++) {
744 void *buf = src->aligned[i];
745 struct page *pg = virt_to_page(buf);
746 unsigned long pg_off = offset_in_page(buf);
747
748 um->addr[i] = dma_map_page(dev->dev, pg, pg_off,
749 um->len, DMA_TO_DEVICE);
750 srcs[i] = um->addr[i] + src->off;
751 ret = dma_mapping_error(dev->dev, um->addr[i]);
752 if (ret) {
753 result("src mapping error", total_tests,
754 src->off, dst->off, len, ret);
755 goto error_unmap_continue;
756 }
757 um->to_cnt++;
758 }
759
760 dsts = &um->addr[src->cnt];
761 for (i = 0; i < dst->cnt; i++) {
762 void *buf = dst->aligned[i];
763 struct page *pg = virt_to_page(buf);
764 unsigned long pg_off = offset_in_page(buf);
765
766 dsts[i] = dma_map_page(dev->dev, pg, pg_off, um->len,
767 DMA_BIDIRECTIONAL);
768 ret = dma_mapping_error(dev->dev, dsts[i]);
769 if (ret) {
770 result("dst mapping error", total_tests,
771 src->off, dst->off, len, ret);
772 goto error_unmap_continue;
773 }
774 um->bidi_cnt++;
775 }
776
777 if (thread->type == DMA_MEMCPY)
778 tx = dev->device_prep_dma_memcpy(chan,
779 dsts[0] + dst->off,
780 srcs[0], len, flags);
781 else if (thread->type == DMA_MEMSET)
782 tx = dev->device_prep_dma_memset(chan,
783 dsts[0] + dst->off,
784 *(src->aligned[0] + src->off),
785 len, flags);
786 else if (thread->type == DMA_XOR)
787 tx = dev->device_prep_dma_xor(chan,
788 dsts[0] + dst->off,
789 srcs, src->cnt,
790 len, flags);
791 else if (thread->type == DMA_PQ) {
792 for (i = 0; i < dst->cnt; i++)
793 dma_pq[i] = dsts[i] + dst->off;
794 tx = dev->device_prep_dma_pq(chan, dma_pq, srcs,
795 src->cnt, pq_coefs,
796 len, flags);
797 }
798
799 if (!tx) {
800 result("prep error", total_tests, src->off,
801 dst->off, len, ret);
802 msleep(100);
803 goto error_unmap_continue;
804 }
805
806 done->done = false;
807 if (!params->polled) {
808 tx->callback = dmatest_callback;
809 tx->callback_param = done;
810 }
811 cookie = tx->tx_submit(tx);
812
813 if (dma_submit_error(cookie)) {
814 result("submit error", total_tests, src->off,
815 dst->off, len, ret);
816 msleep(100);
817 goto error_unmap_continue;
818 }
819
820 if (params->polled) {
821 status = dma_sync_wait(chan, cookie);
822 dmaengine_terminate_sync(chan);
823 if (status == DMA_COMPLETE)
824 done->done = true;
825 } else {
826 dma_async_issue_pending(chan);
827
828 wait_event_freezable_timeout(thread->done_wait,
829 done->done,
830 msecs_to_jiffies(params->timeout));
831
832 status = dma_async_is_tx_complete(chan, cookie, NULL,
833 NULL);
834 }
835
836 if (!done->done) {
837 result("test timed out", total_tests, src->off, dst->off,
838 len, 0);
839 goto error_unmap_continue;
840 } else if (status != DMA_COMPLETE &&
841 !(dma_has_cap(DMA_COMPLETION_NO_ORDER,
842 dev->cap_mask) &&
843 status == DMA_OUT_OF_ORDER)) {
844 result(status == DMA_ERROR ?
845 "completion error status" :
846 "completion busy status", total_tests, src->off,
847 dst->off, len, ret);
848 goto error_unmap_continue;
849 }
850
851 dmaengine_unmap_put(um);
852
853 if (params->noverify) {
854 verbose_result("test passed", total_tests, src->off,
855 dst->off, len, 0);
856 continue;
857 }
858
859 start = ktime_get();
860 pr_debug("%s: verifying source buffer...\n", current->comm);
861 error_count = dmatest_verify(src->aligned, 0, src->off,
862 0, PATTERN_SRC, true, is_memset);
863 error_count += dmatest_verify(src->aligned, src->off,
864 src->off + len, src->off,
865 PATTERN_SRC | PATTERN_COPY, true, is_memset);
866 error_count += dmatest_verify(src->aligned, src->off + len,
867 buf_size, src->off + len,
868 PATTERN_SRC, true, is_memset);
869
870 pr_debug("%s: verifying dest buffer...\n", current->comm);
871 error_count += dmatest_verify(dst->aligned, 0, dst->off,
872 0, PATTERN_DST, false, is_memset);
873
874 error_count += dmatest_verify(dst->aligned, dst->off,
875 dst->off + len, src->off,
876 PATTERN_SRC | PATTERN_COPY, false, is_memset);
877
878 error_count += dmatest_verify(dst->aligned, dst->off + len,
879 buf_size, dst->off + len,
880 PATTERN_DST, false, is_memset);
881
882 diff = ktime_sub(ktime_get(), start);
883 comparetime = ktime_add(comparetime, diff);
884
885 if (error_count) {
886 result("data error", total_tests, src->off, dst->off,
887 len, error_count);
888 failed_tests++;
889 } else {
890 verbose_result("test passed", total_tests, src->off,
891 dst->off, len, 0);
892 }
893
894 continue;
895
896error_unmap_continue:
897 dmaengine_unmap_put(um);
898 failed_tests++;
899 }
900 ktime = ktime_sub(ktime_get(), ktime);
901 ktime = ktime_sub(ktime, comparetime);
902 ktime = ktime_sub(ktime, filltime);
903 runtime = ktime_to_us(ktime);
904
905 ret = 0;
906 kfree(dma_pq);
907err_srcs_array:
908 kfree(srcs);
909err_dst:
910 dmatest_free_test_data(dst);
911err_src:
912 dmatest_free_test_data(src);
913err_free_coefs:
914 kfree(pq_coefs);
915err_thread_type:
916 iops = dmatest_persec(runtime, total_tests);
917 pr_info("%s: summary %u tests, %u failures %llu.%02llu iops %llu KB/s (%d)\n",
918 current->comm, total_tests, failed_tests,
919 FIXPT_TO_INT(iops), FIXPT_GET_FRAC(iops),
920 dmatest_KBs(runtime, total_len), ret);
921
922
923 if (ret || failed_tests)
924 dmaengine_terminate_sync(chan);
925
926 thread->done = true;
927 wake_up(&thread_wait);
928
929 return ret;
930}
931
932static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
933{
934 struct dmatest_thread *thread;
935 struct dmatest_thread *_thread;
936 int ret;
937
938 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
939 ret = kthread_stop(thread->task);
940 pr_debug("thread %s exited with status %d\n",
941 thread->task->comm, ret);
942 list_del(&thread->node);
943 put_task_struct(thread->task);
944 kfree(thread);
945 }
946
947
948 dmaengine_terminate_sync(dtc->chan);
949
950 kfree(dtc);
951}
952
953static int dmatest_add_threads(struct dmatest_info *info,
954 struct dmatest_chan *dtc, enum dma_transaction_type type)
955{
956 struct dmatest_params *params = &info->params;
957 struct dmatest_thread *thread;
958 struct dma_chan *chan = dtc->chan;
959 char *op;
960 unsigned int i;
961
962 if (type == DMA_MEMCPY)
963 op = "copy";
964 else if (type == DMA_MEMSET)
965 op = "set";
966 else if (type == DMA_XOR)
967 op = "xor";
968 else if (type == DMA_PQ)
969 op = "pq";
970 else
971 return -EINVAL;
972
973 for (i = 0; i < params->threads_per_chan; i++) {
974 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
975 if (!thread) {
976 pr_warn("No memory for %s-%s%u\n",
977 dma_chan_name(chan), op, i);
978 break;
979 }
980 thread->info = info;
981 thread->chan = dtc->chan;
982 thread->type = type;
983 thread->test_done.wait = &thread->done_wait;
984 init_waitqueue_head(&thread->done_wait);
985 smp_wmb();
986 thread->task = kthread_create(dmatest_func, thread, "%s-%s%u",
987 dma_chan_name(chan), op, i);
988 if (IS_ERR(thread->task)) {
989 pr_warn("Failed to create thread %s-%s%u\n",
990 dma_chan_name(chan), op, i);
991 kfree(thread);
992 break;
993 }
994
995
996 get_task_struct(thread->task);
997 list_add_tail(&thread->node, &dtc->threads);
998 thread->pending = true;
999 }
1000
1001 return i;
1002}
1003
1004static int dmatest_add_channel(struct dmatest_info *info,
1005 struct dma_chan *chan)
1006{
1007 struct dmatest_chan *dtc;
1008 struct dma_device *dma_dev = chan->device;
1009 unsigned int thread_count = 0;
1010 int cnt;
1011
1012 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
1013 if (!dtc) {
1014 pr_warn("No memory for %s\n", dma_chan_name(chan));
1015 return -ENOMEM;
1016 }
1017
1018 dtc->chan = chan;
1019 INIT_LIST_HEAD(&dtc->threads);
1020
1021 if (dma_has_cap(DMA_COMPLETION_NO_ORDER, dma_dev->cap_mask) &&
1022 info->params.polled) {
1023 info->params.polled = false;
1024 pr_warn("DMA_COMPLETION_NO_ORDER, polled disabled\n");
1025 }
1026
1027 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1028 if (dmatest == 0) {
1029 cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
1030 thread_count += cnt > 0 ? cnt : 0;
1031 }
1032 }
1033
1034 if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
1035 if (dmatest == 1) {
1036 cnt = dmatest_add_threads(info, dtc, DMA_MEMSET);
1037 thread_count += cnt > 0 ? cnt : 0;
1038 }
1039 }
1040
1041 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1042 cnt = dmatest_add_threads(info, dtc, DMA_XOR);
1043 thread_count += cnt > 0 ? cnt : 0;
1044 }
1045 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1046 cnt = dmatest_add_threads(info, dtc, DMA_PQ);
1047 thread_count += cnt > 0 ? cnt : 0;
1048 }
1049
1050 pr_info("Added %u threads using %s\n",
1051 thread_count, dma_chan_name(chan));
1052
1053 list_add_tail(&dtc->node, &info->channels);
1054 info->nr_channels++;
1055
1056 return 0;
1057}
1058
1059static bool filter(struct dma_chan *chan, void *param)
1060{
1061 return dmatest_match_channel(param, chan) && dmatest_match_device(param, chan->device);
1062}
1063
1064static void request_channels(struct dmatest_info *info,
1065 enum dma_transaction_type type)
1066{
1067 dma_cap_mask_t mask;
1068
1069 dma_cap_zero(mask);
1070 dma_cap_set(type, mask);
1071 for (;;) {
1072 struct dmatest_params *params = &info->params;
1073 struct dma_chan *chan;
1074
1075 chan = dma_request_channel(mask, filter, params);
1076 if (chan) {
1077 if (dmatest_add_channel(info, chan)) {
1078 dma_release_channel(chan);
1079 break;
1080 }
1081 } else
1082 break;
1083 if (params->max_channels &&
1084 info->nr_channels >= params->max_channels)
1085 break;
1086 }
1087}
1088
1089static void add_threaded_test(struct dmatest_info *info)
1090{
1091 struct dmatest_params *params = &info->params;
1092
1093
1094 params->buf_size = test_buf_size;
1095 strlcpy(params->channel, strim(test_channel), sizeof(params->channel));
1096 strlcpy(params->device, strim(test_device), sizeof(params->device));
1097 params->threads_per_chan = threads_per_chan;
1098 params->max_channels = max_channels;
1099 params->iterations = iterations;
1100 params->xor_sources = xor_sources;
1101 params->pq_sources = pq_sources;
1102 params->timeout = timeout;
1103 params->noverify = noverify;
1104 params->norandom = norandom;
1105 params->alignment = alignment;
1106 params->transfer_size = transfer_size;
1107 params->polled = polled;
1108
1109 request_channels(info, DMA_MEMCPY);
1110 request_channels(info, DMA_MEMSET);
1111 request_channels(info, DMA_XOR);
1112 request_channels(info, DMA_PQ);
1113}
1114
1115static void run_pending_tests(struct dmatest_info *info)
1116{
1117 struct dmatest_chan *dtc;
1118 unsigned int thread_count = 0;
1119
1120 list_for_each_entry(dtc, &info->channels, node) {
1121 struct dmatest_thread *thread;
1122
1123 thread_count = 0;
1124 list_for_each_entry(thread, &dtc->threads, node) {
1125 wake_up_process(thread->task);
1126 thread_count++;
1127 }
1128 pr_info("Started %u threads using %s\n",
1129 thread_count, dma_chan_name(dtc->chan));
1130 }
1131}
1132
1133static void stop_threaded_test(struct dmatest_info *info)
1134{
1135 struct dmatest_chan *dtc, *_dtc;
1136 struct dma_chan *chan;
1137
1138 list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
1139 list_del(&dtc->node);
1140 chan = dtc->chan;
1141 dmatest_cleanup_channel(dtc);
1142 pr_debug("dropped channel %s\n", dma_chan_name(chan));
1143 dma_release_channel(chan);
1144 }
1145
1146 info->nr_channels = 0;
1147}
1148
1149static void start_threaded_tests(struct dmatest_info *info)
1150{
1151
1152
1153
1154 if (!info->did_init)
1155 return;
1156
1157 run_pending_tests(info);
1158}
1159
1160static int dmatest_run_get(char *val, const struct kernel_param *kp)
1161{
1162 struct dmatest_info *info = &test_info;
1163
1164 mutex_lock(&info->lock);
1165 if (is_threaded_test_run(info)) {
1166 dmatest_run = true;
1167 } else {
1168 if (!is_threaded_test_pending(info))
1169 stop_threaded_test(info);
1170 dmatest_run = false;
1171 }
1172 mutex_unlock(&info->lock);
1173
1174 return param_get_bool(val, kp);
1175}
1176
1177static int dmatest_run_set(const char *val, const struct kernel_param *kp)
1178{
1179 struct dmatest_info *info = &test_info;
1180 int ret;
1181
1182 mutex_lock(&info->lock);
1183 ret = param_set_bool(val, kp);
1184 if (ret) {
1185 mutex_unlock(&info->lock);
1186 return ret;
1187 } else if (dmatest_run) {
1188 if (!is_threaded_test_pending(info)) {
1189
1190
1191
1192 ret = info->last_error;
1193 if (ret) {
1194
1195 pr_err("Channel misconfigured, can't continue\n");
1196 mutex_unlock(&info->lock);
1197 return ret;
1198 } else {
1199
1200 pr_info("No channels configured, continue with any\n");
1201 if (!is_threaded_test_run(info))
1202 stop_threaded_test(info);
1203 add_threaded_test(info);
1204 }
1205 }
1206 start_threaded_tests(info);
1207 } else {
1208 stop_threaded_test(info);
1209 }
1210
1211 mutex_unlock(&info->lock);
1212
1213 return ret;
1214}
1215
1216static int dmatest_chan_set(const char *val, const struct kernel_param *kp)
1217{
1218 struct dmatest_info *info = &test_info;
1219 struct dmatest_chan *dtc;
1220 char chan_reset_val[20];
1221 int ret;
1222
1223 mutex_lock(&info->lock);
1224 ret = param_set_copystring(val, kp);
1225 if (ret) {
1226 mutex_unlock(&info->lock);
1227 return ret;
1228 }
1229
1230 if (!is_threaded_test_run(info) && !is_threaded_test_pending(info))
1231 stop_threaded_test(info);
1232
1233 if (is_threaded_test_pending(info)) {
1234 list_for_each_entry(dtc, &info->channels, node) {
1235 if (strcmp(dma_chan_name(dtc->chan),
1236 strim(test_channel)) == 0) {
1237 dtc = list_last_entry(&info->channels,
1238 struct dmatest_chan,
1239 node);
1240 strlcpy(chan_reset_val,
1241 dma_chan_name(dtc->chan),
1242 sizeof(chan_reset_val));
1243 ret = -EBUSY;
1244 goto add_chan_err;
1245 }
1246 }
1247 }
1248
1249 add_threaded_test(info);
1250
1251
1252 if (!list_empty(&info->channels)) {
1253
1254
1255
1256
1257
1258
1259 dtc = list_last_entry(&info->channels, struct dmatest_chan, node);
1260 if ((strcmp(dma_chan_name(dtc->chan), strim(test_channel)) != 0)
1261 && (strcmp("", strim(test_channel)) != 0)) {
1262 ret = -EINVAL;
1263 strlcpy(chan_reset_val, dma_chan_name(dtc->chan),
1264 sizeof(chan_reset_val));
1265 goto add_chan_err;
1266 }
1267
1268 } else {
1269
1270 strlcpy(chan_reset_val, "", sizeof(chan_reset_val));
1271 ret = -EBUSY;
1272 goto add_chan_err;
1273 }
1274
1275 info->last_error = ret;
1276 mutex_unlock(&info->lock);
1277
1278 return ret;
1279
1280add_chan_err:
1281 param_set_copystring(chan_reset_val, kp);
1282 info->last_error = ret;
1283 mutex_unlock(&info->lock);
1284
1285 return ret;
1286}
1287
1288static int dmatest_chan_get(char *val, const struct kernel_param *kp)
1289{
1290 struct dmatest_info *info = &test_info;
1291
1292 mutex_lock(&info->lock);
1293 if (!is_threaded_test_run(info) && !is_threaded_test_pending(info)) {
1294 stop_threaded_test(info);
1295 strlcpy(test_channel, "", sizeof(test_channel));
1296 }
1297 mutex_unlock(&info->lock);
1298
1299 return param_get_string(val, kp);
1300}
1301
1302static int dmatest_test_list_get(char *val, const struct kernel_param *kp)
1303{
1304 struct dmatest_info *info = &test_info;
1305 struct dmatest_chan *dtc;
1306 unsigned int thread_count = 0;
1307
1308 list_for_each_entry(dtc, &info->channels, node) {
1309 struct dmatest_thread *thread;
1310
1311 thread_count = 0;
1312 list_for_each_entry(thread, &dtc->threads, node) {
1313 thread_count++;
1314 }
1315 pr_info("%u threads using %s\n",
1316 thread_count, dma_chan_name(dtc->chan));
1317 }
1318
1319 return 0;
1320}
1321
1322static int __init dmatest_init(void)
1323{
1324 struct dmatest_info *info = &test_info;
1325 struct dmatest_params *params = &info->params;
1326
1327 if (dmatest_run) {
1328 mutex_lock(&info->lock);
1329 add_threaded_test(info);
1330 run_pending_tests(info);
1331 mutex_unlock(&info->lock);
1332 }
1333
1334 if (params->iterations && wait)
1335 wait_event(thread_wait, !is_threaded_test_run(info));
1336
1337
1338
1339
1340 info->did_init = true;
1341
1342 return 0;
1343}
1344
1345late_initcall(dmatest_init);
1346
1347static void __exit dmatest_exit(void)
1348{
1349 struct dmatest_info *info = &test_info;
1350
1351 mutex_lock(&info->lock);
1352 stop_threaded_test(info);
1353 mutex_unlock(&info->lock);
1354}
1355module_exit(dmatest_exit);
1356
1357MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1358MODULE_LICENSE("GPL v2");
1359