2 * DMA Engine test module
4 * Copyright (C) 2007 Atmel Corporation
5 * Copyright (C) 2013 Intel Corporation
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
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/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/random.h>
20 #include <linux/slab.h>
21 #include <linux/wait.h>
22 #include <linux/ctype.h>
23 #include <linux/debugfs.h>
24 #include <linux/uaccess.h>
25 #include <linux/seq_file.h>
27 static unsigned int test_buf_size = 16384;
28 module_param(test_buf_size, uint, S_IRUGO | S_IWUSR);
29 MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
31 static char test_channel[20];
32 module_param_string(channel, test_channel, sizeof(test_channel),
34 MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
36 static char test_device[20];
37 module_param_string(device, test_device, sizeof(test_device),
39 MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
41 static unsigned int threads_per_chan = 1;
42 module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR);
43 MODULE_PARM_DESC(threads_per_chan,
44 "Number of threads to start per channel (default: 1)");
46 static unsigned int max_channels;
47 module_param(max_channels, uint, S_IRUGO | S_IWUSR);
48 MODULE_PARM_DESC(max_channels,
49 "Maximum number of channels to use (default: all)");
51 static unsigned int iterations;
52 module_param(iterations, uint, S_IRUGO | S_IWUSR);
53 MODULE_PARM_DESC(iterations,
54 "Iterations before stopping test (default: infinite)");
56 static unsigned int xor_sources = 3;
57 module_param(xor_sources, uint, S_IRUGO | S_IWUSR);
58 MODULE_PARM_DESC(xor_sources,
59 "Number of xor source buffers (default: 3)");
61 static unsigned int pq_sources = 3;
62 module_param(pq_sources, uint, S_IRUGO | S_IWUSR);
63 MODULE_PARM_DESC(pq_sources,
64 "Number of p+q source buffers (default: 3)");
66 static int timeout = 3000;
67 module_param(timeout, uint, S_IRUGO | S_IWUSR);
68 MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
69 "Pass -1 for infinite timeout");
71 /* Maximum amount of mismatched bytes in buffer to print */
72 #define MAX_ERROR_COUNT 32
75 * Initialization patterns. All bytes in the source buffer has bit 7
76 * set, all bytes in the destination buffer has bit 7 cleared.
78 * Bit 6 is set for all bytes which are to be copied by the DMA
79 * engine. Bit 5 is set for all bytes which are to be overwritten by
82 * The remaining bits are the inverse of a counter which increments by
83 * one for each byte address.
85 #define PATTERN_SRC 0x80
86 #define PATTERN_DST 0x00
87 #define PATTERN_COPY 0x40
88 #define PATTERN_OVERWRITE 0x20
89 #define PATTERN_COUNT_MASK 0x1f
91 enum dmatest_error_type {
99 DMATEST_ET_DMA_IN_PROGRESS,
101 DMATEST_ET_VERIFY_BUF,
104 struct dmatest_verify_buffer {
110 struct dmatest_verify_result {
111 unsigned int error_count;
112 struct dmatest_verify_buffer data[MAX_ERROR_COUNT];
117 struct dmatest_thread_result {
118 struct list_head node;
120 unsigned int src_off;
121 unsigned int dst_off;
123 enum dmatest_error_type type;
127 enum dma_status status;
129 struct dmatest_verify_result *vr;
133 struct dmatest_result {
134 struct list_head node;
136 struct list_head results;
141 struct dmatest_thread {
142 struct list_head node;
143 struct dmatest_info *info;
144 struct task_struct *task;
145 struct dma_chan *chan;
148 enum dma_transaction_type type;
152 struct dmatest_chan {
153 struct list_head node;
154 struct dma_chan *chan;
155 struct list_head threads;
159 * struct dmatest_params - test parameters.
160 * @buf_size: size of the memcpy test buffer
161 * @channel: bus ID of the channel to test
162 * @device: bus ID of the DMA Engine to test
163 * @threads_per_chan: number of threads to start per channel
164 * @max_channels: maximum number of channels to use
165 * @iterations: iterations before stopping test
166 * @xor_sources: number of xor source buffers
167 * @pq_sources: number of p+q source buffers
168 * @timeout: transfer timeout in msec, -1 for infinite timeout
170 struct dmatest_params {
171 unsigned int buf_size;
174 unsigned int threads_per_chan;
175 unsigned int max_channels;
176 unsigned int iterations;
177 unsigned int xor_sources;
178 unsigned int pq_sources;
183 * struct dmatest_info - test information.
184 * @params: test parameters
185 * @lock: access protection to the fields of this structure
187 struct dmatest_info {
188 /* Test parameters */
189 struct dmatest_params params;
192 struct list_head channels;
193 unsigned int nr_channels;
196 /* debugfs related stuff */
200 struct list_head results;
201 struct mutex results_lock;
204 static struct dmatest_info test_info;
206 static bool dmatest_match_channel(struct dmatest_params *params,
207 struct dma_chan *chan)
209 if (params->channel[0] == '\0')
211 return strcmp(dma_chan_name(chan), params->channel) == 0;
214 static bool dmatest_match_device(struct dmatest_params *params,
215 struct dma_device *device)
217 if (params->device[0] == '\0')
219 return strcmp(dev_name(device->dev), params->device) == 0;
222 static unsigned long dmatest_random(void)
226 get_random_bytes(&buf, sizeof(buf));
230 static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
231 unsigned int buf_size)
236 for (; (buf = *bufs); bufs++) {
237 for (i = 0; i < start; i++)
238 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
239 for ( ; i < start + len; i++)
240 buf[i] = PATTERN_SRC | PATTERN_COPY
241 | (~i & PATTERN_COUNT_MASK);
242 for ( ; i < buf_size; i++)
243 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
248 static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
249 unsigned int buf_size)
254 for (; (buf = *bufs); bufs++) {
255 for (i = 0; i < start; i++)
256 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
257 for ( ; i < start + len; i++)
258 buf[i] = PATTERN_DST | PATTERN_OVERWRITE
259 | (~i & PATTERN_COUNT_MASK);
260 for ( ; i < buf_size; i++)
261 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
265 static unsigned int dmatest_verify(struct dmatest_verify_result *vr, u8 **bufs,
266 unsigned int start, unsigned int end, unsigned int counter,
267 u8 pattern, bool is_srcbuf)
270 unsigned int error_count = 0;
274 unsigned int counter_orig = counter;
275 struct dmatest_verify_buffer *vb;
277 for (; (buf = *bufs); bufs++) {
278 counter = counter_orig;
279 for (i = start; i < end; i++) {
281 expected = pattern | (~counter & PATTERN_COUNT_MASK);
282 if (actual != expected) {
283 if (error_count < MAX_ERROR_COUNT && vr) {
284 vb = &vr->data[error_count];
286 vb->expected = expected;
295 if (error_count > MAX_ERROR_COUNT)
296 pr_warning("%s: %u errors suppressed\n",
297 current->comm, error_count - MAX_ERROR_COUNT);
302 /* poor man's completion - we want to use wait_event_freezable() on it */
303 struct dmatest_done {
305 wait_queue_head_t *wait;
308 static void dmatest_callback(void *arg)
310 struct dmatest_done *done = arg;
313 wake_up_all(done->wait);
316 static inline void unmap_src(struct device *dev, dma_addr_t *addr, size_t len,
320 dma_unmap_single(dev, addr[count], len, DMA_TO_DEVICE);
323 static inline void unmap_dst(struct device *dev, dma_addr_t *addr, size_t len,
327 dma_unmap_single(dev, addr[count], len, DMA_BIDIRECTIONAL);
330 static unsigned int min_odd(unsigned int x, unsigned int y)
332 unsigned int val = min(x, y);
334 return val % 2 ? val : val - 1;
337 static char *verify_result_get_one(struct dmatest_verify_result *vr,
340 struct dmatest_verify_buffer *vb = &vr->data[i];
341 u8 diff = vb->actual ^ vr->pattern;
342 static char buf[512];
346 msg = "srcbuf overwritten!";
347 else if ((vr->pattern & PATTERN_COPY)
348 && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
349 msg = "dstbuf not copied!";
350 else if (diff & PATTERN_SRC)
351 msg = "dstbuf was copied!";
353 msg = "dstbuf mismatch!";
355 snprintf(buf, sizeof(buf) - 1, "%s [0x%x] Expected %02x, got %02x", msg,
356 vb->index, vb->expected, vb->actual);
361 static char *thread_result_get(const char *name,
362 struct dmatest_thread_result *tr)
364 static const char * const messages[] = {
365 [DMATEST_ET_OK] = "No errors",
366 [DMATEST_ET_MAP_SRC] = "src mapping error",
367 [DMATEST_ET_MAP_DST] = "dst mapping error",
368 [DMATEST_ET_PREP] = "prep error",
369 [DMATEST_ET_SUBMIT] = "submit error",
370 [DMATEST_ET_TIMEOUT] = "test timed out",
371 [DMATEST_ET_DMA_ERROR] =
372 "got completion callback (DMA_ERROR)",
373 [DMATEST_ET_DMA_IN_PROGRESS] =
374 "got completion callback (DMA_IN_PROGRESS)",
375 [DMATEST_ET_VERIFY] = "errors",
376 [DMATEST_ET_VERIFY_BUF] = "verify errors",
378 static char buf[512];
380 snprintf(buf, sizeof(buf) - 1,
381 "%s: #%u: %s with src_off=0x%x ""dst_off=0x%x len=0x%x (%lu)",
382 name, tr->n, messages[tr->type], tr->src_off, tr->dst_off,
388 static int thread_result_add(struct dmatest_info *info,
389 struct dmatest_result *r, enum dmatest_error_type type,
390 unsigned int n, unsigned int src_off, unsigned int dst_off,
391 unsigned int len, unsigned long data)
393 struct dmatest_thread_result *tr;
395 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
401 tr->src_off = src_off;
402 tr->dst_off = dst_off;
406 mutex_lock(&info->results_lock);
407 list_add_tail(&tr->node, &r->results);
408 mutex_unlock(&info->results_lock);
410 if (tr->type == DMATEST_ET_OK)
411 pr_debug("%s\n", thread_result_get(r->name, tr));
413 pr_warn("%s\n", thread_result_get(r->name, tr));
418 static unsigned int verify_result_add(struct dmatest_info *info,
419 struct dmatest_result *r, unsigned int n,
420 unsigned int src_off, unsigned int dst_off, unsigned int len,
421 u8 **bufs, int whence, unsigned int counter, u8 pattern,
424 struct dmatest_verify_result *vr;
425 unsigned int error_count;
426 unsigned int buf_off = is_srcbuf ? src_off : dst_off;
427 unsigned int start, end;
432 } else if (whence > 0) {
433 start = buf_off + len;
434 end = info->params.buf_size;
440 vr = kmalloc(sizeof(*vr), GFP_KERNEL);
442 pr_warn("dmatest: No memory to store verify result\n");
443 return dmatest_verify(NULL, bufs, start, end, counter, pattern,
447 vr->pattern = pattern;
448 vr->is_srcbuf = is_srcbuf;
450 error_count = dmatest_verify(vr, bufs, start, end, counter, pattern,
453 vr->error_count = error_count;
454 thread_result_add(info, r, DMATEST_ET_VERIFY_BUF, n, src_off,
455 dst_off, len, (unsigned long)vr);
463 static void result_free(struct dmatest_info *info, const char *name)
465 struct dmatest_result *r, *_r;
467 mutex_lock(&info->results_lock);
468 list_for_each_entry_safe(r, _r, &info->results, node) {
469 struct dmatest_thread_result *tr, *_tr;
471 if (name && strcmp(r->name, name))
474 list_for_each_entry_safe(tr, _tr, &r->results, node) {
475 if (tr->type == DMATEST_ET_VERIFY_BUF)
486 mutex_unlock(&info->results_lock);
489 static struct dmatest_result *result_init(struct dmatest_info *info,
492 struct dmatest_result *r;
494 r = kzalloc(sizeof(*r), GFP_KERNEL);
496 r->name = kstrdup(name, GFP_KERNEL);
497 INIT_LIST_HEAD(&r->results);
498 mutex_lock(&info->results_lock);
499 list_add_tail(&r->node, &info->results);
500 mutex_unlock(&info->results_lock);
506 * This function repeatedly tests DMA transfers of various lengths and
507 * offsets for a given operation type until it is told to exit by
508 * kthread_stop(). There may be multiple threads running this function
509 * in parallel for a single channel, and there may be multiple channels
510 * being tested in parallel.
512 * Before each test, the source and destination buffer is initialized
513 * with a known pattern. This pattern is different depending on
514 * whether it's in an area which is supposed to be copied or
515 * overwritten, and different in the source and destination buffers.
516 * So if the DMA engine doesn't copy exactly what we tell it to copy,
519 static int dmatest_func(void *data)
521 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait);
522 struct dmatest_thread *thread = data;
523 struct dmatest_done done = { .wait = &done_wait };
524 struct dmatest_info *info;
525 struct dmatest_params *params;
526 struct dma_chan *chan;
527 struct dma_device *dev;
528 const char *thread_name;
529 unsigned int src_off, dst_off, len;
530 unsigned int error_count;
531 unsigned int failed_tests = 0;
532 unsigned int total_tests = 0;
534 enum dma_status status;
535 enum dma_ctrl_flags flags;
541 struct dmatest_result *result;
543 thread_name = current->comm;
550 params = &info->params;
553 if (thread->type == DMA_MEMCPY)
554 src_cnt = dst_cnt = 1;
555 else if (thread->type == DMA_XOR) {
556 /* force odd to ensure dst = src */
557 src_cnt = min_odd(params->xor_sources | 1, dev->max_xor);
559 } else if (thread->type == DMA_PQ) {
560 /* force odd to ensure dst = src */
561 src_cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
564 pq_coefs = kmalloc(params->pq_sources+1, GFP_KERNEL);
566 goto err_thread_type;
568 for (i = 0; i < src_cnt; i++)
571 goto err_thread_type;
573 result = result_init(info, thread_name);
577 thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL);
580 for (i = 0; i < src_cnt; i++) {
581 thread->srcs[i] = kmalloc(params->buf_size, GFP_KERNEL);
582 if (!thread->srcs[i])
585 thread->srcs[i] = NULL;
587 thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL);
590 for (i = 0; i < dst_cnt; i++) {
591 thread->dsts[i] = kmalloc(params->buf_size, GFP_KERNEL);
592 if (!thread->dsts[i])
595 thread->dsts[i] = NULL;
597 set_user_nice(current, 10);
600 * src and dst buffers are freed by ourselves below
602 flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
604 while (!kthread_should_stop()
605 && !(params->iterations && total_tests >= params->iterations)) {
606 struct dma_async_tx_descriptor *tx = NULL;
607 dma_addr_t dma_srcs[src_cnt];
608 dma_addr_t dma_dsts[dst_cnt];
613 /* honor alignment restrictions */
614 if (thread->type == DMA_MEMCPY)
615 align = dev->copy_align;
616 else if (thread->type == DMA_XOR)
617 align = dev->xor_align;
618 else if (thread->type == DMA_PQ)
619 align = dev->pq_align;
621 if (1 << align > params->buf_size) {
622 pr_err("%u-byte buffer too small for %d-byte alignment\n",
623 params->buf_size, 1 << align);
627 len = dmatest_random() % params->buf_size + 1;
628 len = (len >> align) << align;
631 src_off = dmatest_random() % (params->buf_size - len + 1);
632 dst_off = dmatest_random() % (params->buf_size - len + 1);
634 src_off = (src_off >> align) << align;
635 dst_off = (dst_off >> align) << align;
637 dmatest_init_srcs(thread->srcs, src_off, len, params->buf_size);
638 dmatest_init_dsts(thread->dsts, dst_off, len, params->buf_size);
640 for (i = 0; i < src_cnt; i++) {
641 u8 *buf = thread->srcs[i] + src_off;
643 dma_srcs[i] = dma_map_single(dev->dev, buf, len,
645 ret = dma_mapping_error(dev->dev, dma_srcs[i]);
647 unmap_src(dev->dev, dma_srcs, len, i);
648 thread_result_add(info, result,
650 total_tests, src_off, dst_off,
656 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
657 for (i = 0; i < dst_cnt; i++) {
658 dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
661 ret = dma_mapping_error(dev->dev, dma_dsts[i]);
663 unmap_src(dev->dev, dma_srcs, len, src_cnt);
664 unmap_dst(dev->dev, dma_dsts, params->buf_size,
666 thread_result_add(info, result,
668 total_tests, src_off, dst_off,
675 if (thread->type == DMA_MEMCPY)
676 tx = dev->device_prep_dma_memcpy(chan,
677 dma_dsts[0] + dst_off,
680 else if (thread->type == DMA_XOR)
681 tx = dev->device_prep_dma_xor(chan,
682 dma_dsts[0] + dst_off,
685 else if (thread->type == DMA_PQ) {
686 dma_addr_t dma_pq[dst_cnt];
688 for (i = 0; i < dst_cnt; i++)
689 dma_pq[i] = dma_dsts[i] + dst_off;
690 tx = dev->device_prep_dma_pq(chan, dma_pq, dma_srcs,
696 unmap_src(dev->dev, dma_srcs, len, src_cnt);
697 unmap_dst(dev->dev, dma_dsts, params->buf_size,
699 thread_result_add(info, result, DMATEST_ET_PREP,
700 total_tests, src_off, dst_off,
708 tx->callback = dmatest_callback;
709 tx->callback_param = &done;
710 cookie = tx->tx_submit(tx);
712 if (dma_submit_error(cookie)) {
713 thread_result_add(info, result, DMATEST_ET_SUBMIT,
714 total_tests, src_off, dst_off,
720 dma_async_issue_pending(chan);
722 wait_event_freezable_timeout(done_wait, done.done,
723 msecs_to_jiffies(params->timeout));
725 status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
729 * We're leaving the timed out dma operation with
730 * dangling pointer to done_wait. To make this
731 * correct, we'll need to allocate wait_done for
732 * each test iteration and perform "who's gonna
733 * free it this time?" dancing. For now, just
736 thread_result_add(info, result, DMATEST_ET_TIMEOUT,
737 total_tests, src_off, dst_off,
741 } else if (status != DMA_SUCCESS) {
742 enum dmatest_error_type type = (status == DMA_ERROR) ?
743 DMATEST_ET_DMA_ERROR : DMATEST_ET_DMA_IN_PROGRESS;
744 thread_result_add(info, result, type,
745 total_tests, src_off, dst_off,
751 /* Unmap by myself */
752 unmap_src(dev->dev, dma_srcs, len, src_cnt);
753 unmap_dst(dev->dev, dma_dsts, params->buf_size, dst_cnt);
757 pr_debug("%s: verifying source buffer...\n", thread_name);
758 error_count += verify_result_add(info, result, total_tests,
759 src_off, dst_off, len, thread->srcs, -1,
760 0, PATTERN_SRC, true);
761 error_count += verify_result_add(info, result, total_tests,
762 src_off, dst_off, len, thread->srcs, 0,
763 src_off, PATTERN_SRC | PATTERN_COPY, true);
764 error_count += verify_result_add(info, result, total_tests,
765 src_off, dst_off, len, thread->srcs, 1,
766 src_off + len, PATTERN_SRC, true);
768 pr_debug("%s: verifying dest buffer...\n", thread_name);
769 error_count += verify_result_add(info, result, total_tests,
770 src_off, dst_off, len, thread->dsts, -1,
771 0, PATTERN_DST, false);
772 error_count += verify_result_add(info, result, total_tests,
773 src_off, dst_off, len, thread->dsts, 0,
774 src_off, PATTERN_SRC | PATTERN_COPY, false);
775 error_count += verify_result_add(info, result, total_tests,
776 src_off, dst_off, len, thread->dsts, 1,
777 dst_off + len, PATTERN_DST, false);
780 thread_result_add(info, result, DMATEST_ET_VERIFY,
781 total_tests, src_off, dst_off,
785 thread_result_add(info, result, DMATEST_ET_OK,
786 total_tests, src_off, dst_off,
792 for (i = 0; thread->dsts[i]; i++)
793 kfree(thread->dsts[i]);
797 for (i = 0; thread->srcs[i]; i++)
798 kfree(thread->srcs[i]);
804 pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
805 thread_name, total_tests, failed_tests, ret);
807 /* terminate all transfers on specified channels */
809 dmaengine_terminate_all(chan);
813 if (params->iterations > 0)
814 while (!kthread_should_stop()) {
815 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit);
816 interruptible_sleep_on(&wait_dmatest_exit);
822 static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
824 struct dmatest_thread *thread;
825 struct dmatest_thread *_thread;
828 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
829 ret = kthread_stop(thread->task);
830 pr_debug("dmatest: thread %s exited with status %d\n",
831 thread->task->comm, ret);
832 list_del(&thread->node);
836 /* terminate all transfers on specified channels */
837 dmaengine_terminate_all(dtc->chan);
842 static int dmatest_add_threads(struct dmatest_info *info,
843 struct dmatest_chan *dtc, enum dma_transaction_type type)
845 struct dmatest_params *params = &info->params;
846 struct dmatest_thread *thread;
847 struct dma_chan *chan = dtc->chan;
851 if (type == DMA_MEMCPY)
853 else if (type == DMA_XOR)
855 else if (type == DMA_PQ)
860 for (i = 0; i < params->threads_per_chan; i++) {
861 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
863 pr_warning("dmatest: No memory for %s-%s%u\n",
864 dma_chan_name(chan), op, i);
869 thread->chan = dtc->chan;
872 thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
873 dma_chan_name(chan), op, i);
874 if (IS_ERR(thread->task)) {
875 pr_warning("dmatest: Failed to run thread %s-%s%u\n",
876 dma_chan_name(chan), op, i);
881 /* srcbuf and dstbuf are allocated by the thread itself */
883 list_add_tail(&thread->node, &dtc->threads);
889 static int dmatest_add_channel(struct dmatest_info *info,
890 struct dma_chan *chan)
892 struct dmatest_chan *dtc;
893 struct dma_device *dma_dev = chan->device;
894 unsigned int thread_count = 0;
897 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
899 pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
904 INIT_LIST_HEAD(&dtc->threads);
906 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
907 cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
908 thread_count += cnt > 0 ? cnt : 0;
910 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
911 cnt = dmatest_add_threads(info, dtc, DMA_XOR);
912 thread_count += cnt > 0 ? cnt : 0;
914 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
915 cnt = dmatest_add_threads(info, dtc, DMA_PQ);
916 thread_count += cnt > 0 ? cnt : 0;
919 pr_info("dmatest: Started %u threads using %s\n",
920 thread_count, dma_chan_name(chan));
922 list_add_tail(&dtc->node, &info->channels);
928 static bool filter(struct dma_chan *chan, void *param)
930 struct dmatest_params *params = param;
932 if (!dmatest_match_channel(params, chan) ||
933 !dmatest_match_device(params, chan->device))
939 static int __run_threaded_test(struct dmatest_info *info)
942 struct dma_chan *chan;
943 struct dmatest_params *params = &info->params;
947 dma_cap_set(DMA_MEMCPY, mask);
949 chan = dma_request_channel(mask, filter, params);
951 err = dmatest_add_channel(info, chan);
953 dma_release_channel(chan);
954 break; /* add_channel failed, punt */
957 break; /* no more channels available */
958 if (params->max_channels &&
959 info->nr_channels >= params->max_channels)
960 break; /* we have all we need */
966 static int run_threaded_test(struct dmatest_info *info)
970 mutex_lock(&info->lock);
971 ret = __run_threaded_test(info);
972 mutex_unlock(&info->lock);
977 static void __stop_threaded_test(struct dmatest_info *info)
979 struct dmatest_chan *dtc, *_dtc;
980 struct dma_chan *chan;
982 list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
983 list_del(&dtc->node);
985 dmatest_cleanup_channel(dtc);
986 pr_debug("dmatest: dropped channel %s\n", dma_chan_name(chan));
987 dma_release_channel(chan);
990 info->nr_channels = 0;
993 static void stop_threaded_test(struct dmatest_info *info)
995 mutex_lock(&info->lock);
996 __stop_threaded_test(info);
997 mutex_unlock(&info->lock);
1000 static int __restart_threaded_test(struct dmatest_info *info, bool run)
1002 struct dmatest_params *params = &info->params;
1004 /* Stop any running test first */
1005 __stop_threaded_test(info);
1010 /* Clear results from previous run */
1011 result_free(info, NULL);
1013 /* Copy test parameters */
1014 params->buf_size = test_buf_size;
1015 strlcpy(params->channel, strim(test_channel), sizeof(params->channel));
1016 strlcpy(params->device, strim(test_device), sizeof(params->device));
1017 params->threads_per_chan = threads_per_chan;
1018 params->max_channels = max_channels;
1019 params->iterations = iterations;
1020 params->xor_sources = xor_sources;
1021 params->pq_sources = pq_sources;
1022 params->timeout = timeout;
1024 /* Run test with new parameters */
1025 return __run_threaded_test(info);
1028 static bool __is_threaded_test_run(struct dmatest_info *info)
1030 struct dmatest_chan *dtc;
1032 list_for_each_entry(dtc, &info->channels, node) {
1033 struct dmatest_thread *thread;
1035 list_for_each_entry(thread, &dtc->threads, node) {
1044 static ssize_t dtf_read_run(struct file *file, char __user *user_buf,
1045 size_t count, loff_t *ppos)
1047 struct dmatest_info *info = file->private_data;
1050 mutex_lock(&info->lock);
1052 if (__is_threaded_test_run(info)) {
1055 __stop_threaded_test(info);
1059 mutex_unlock(&info->lock);
1062 return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
1065 static ssize_t dtf_write_run(struct file *file, const char __user *user_buf,
1066 size_t count, loff_t *ppos)
1068 struct dmatest_info *info = file->private_data;
1073 if (copy_from_user(buf, user_buf, min(count, (sizeof(buf) - 1))))
1076 if (strtobool(buf, &bv) == 0) {
1077 mutex_lock(&info->lock);
1079 if (__is_threaded_test_run(info))
1082 ret = __restart_threaded_test(info, bv);
1084 mutex_unlock(&info->lock);
1087 return ret ? ret : count;
1090 static const struct file_operations dtf_run_fops = {
1091 .read = dtf_read_run,
1092 .write = dtf_write_run,
1093 .open = simple_open,
1094 .llseek = default_llseek,
1097 static int dtf_results_show(struct seq_file *sf, void *data)
1099 struct dmatest_info *info = sf->private;
1100 struct dmatest_result *result;
1101 struct dmatest_thread_result *tr;
1104 mutex_lock(&info->results_lock);
1105 list_for_each_entry(result, &info->results, node) {
1106 list_for_each_entry(tr, &result->results, node) {
1107 seq_printf(sf, "%s\n",
1108 thread_result_get(result->name, tr));
1109 if (tr->type == DMATEST_ET_VERIFY_BUF) {
1110 for (i = 0; i < tr->vr->error_count; i++) {
1111 seq_printf(sf, "\t%s\n",
1112 verify_result_get_one(tr->vr, i));
1118 mutex_unlock(&info->results_lock);
1122 static int dtf_results_open(struct inode *inode, struct file *file)
1124 return single_open(file, dtf_results_show, inode->i_private);
1127 static const struct file_operations dtf_results_fops = {
1128 .open = dtf_results_open,
1130 .llseek = seq_lseek,
1131 .release = single_release,
1134 static int dmatest_register_dbgfs(struct dmatest_info *info)
1138 d = debugfs_create_dir("dmatest", NULL);
1146 /* Run or stop threaded test */
1147 debugfs_create_file("run", S_IWUSR | S_IRUGO, info->root, info,
1150 /* Results of test in progress */
1151 debugfs_create_file("results", S_IRUGO, info->root, info,
1157 pr_err("dmatest: Failed to initialize debugfs\n");
1161 static int __init dmatest_init(void)
1163 struct dmatest_info *info = &test_info;
1166 memset(info, 0, sizeof(*info));
1168 mutex_init(&info->lock);
1169 INIT_LIST_HEAD(&info->channels);
1171 mutex_init(&info->results_lock);
1172 INIT_LIST_HEAD(&info->results);
1174 ret = dmatest_register_dbgfs(info);
1181 return run_threaded_test(info);
1184 /* when compiled-in wait for drivers to load first */
1185 late_initcall(dmatest_init);
1187 static void __exit dmatest_exit(void)
1189 struct dmatest_info *info = &test_info;
1191 debugfs_remove_recursive(info->root);
1192 stop_threaded_test(info);
1193 result_free(info, NULL);
1195 module_exit(dmatest_exit);
1197 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1198 MODULE_LICENSE("GPL v2");