1 // SPDX-License-Identifier: GPL-2.0-only
3 * DMA Engine test module
5 * Copyright (C) 2007 Atmel Corporation
6 * Copyright (C) 2013 Intel Corporation
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
24 static unsigned int test_buf_size = 16384;
25 module_param(test_buf_size, uint, S_IRUGO | S_IWUSR);
26 MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
28 static char test_device[32];
29 module_param_string(device, test_device, sizeof(test_device),
31 MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
33 static unsigned int threads_per_chan = 1;
34 module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR);
35 MODULE_PARM_DESC(threads_per_chan,
36 "Number of threads to start per channel (default: 1)");
38 static unsigned int max_channels;
39 module_param(max_channels, uint, S_IRUGO | S_IWUSR);
40 MODULE_PARM_DESC(max_channels,
41 "Maximum number of channels to use (default: all)");
43 static unsigned int iterations;
44 module_param(iterations, uint, S_IRUGO | S_IWUSR);
45 MODULE_PARM_DESC(iterations,
46 "Iterations before stopping test (default: infinite)");
48 static unsigned int dmatest;
49 module_param(dmatest, uint, S_IRUGO | S_IWUSR);
50 MODULE_PARM_DESC(dmatest,
51 "dmatest 0-memcpy 1-memset (default: 0)");
53 static unsigned int xor_sources = 3;
54 module_param(xor_sources, uint, S_IRUGO | S_IWUSR);
55 MODULE_PARM_DESC(xor_sources,
56 "Number of xor source buffers (default: 3)");
58 static unsigned int pq_sources = 3;
59 module_param(pq_sources, uint, S_IRUGO | S_IWUSR);
60 MODULE_PARM_DESC(pq_sources,
61 "Number of p+q source buffers (default: 3)");
63 static int timeout = 3000;
64 module_param(timeout, int, S_IRUGO | S_IWUSR);
65 MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
66 "Pass -1 for infinite timeout");
69 module_param(noverify, bool, S_IRUGO | S_IWUSR);
70 MODULE_PARM_DESC(noverify, "Disable data verification (default: verify)");
73 module_param(norandom, bool, 0644);
74 MODULE_PARM_DESC(norandom, "Disable random offset setup (default: random)");
77 module_param(verbose, bool, S_IRUGO | S_IWUSR);
78 MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)");
80 static int alignment = -1;
81 module_param(alignment, int, 0644);
82 MODULE_PARM_DESC(alignment, "Custom data address alignment taken as 2^(alignment) (default: not used (-1))");
84 static unsigned int transfer_size;
85 module_param(transfer_size, uint, 0644);
86 MODULE_PARM_DESC(transfer_size, "Optional custom transfer size in bytes (default: not used (0))");
89 module_param(polled, bool, S_IRUGO | S_IWUSR);
90 MODULE_PARM_DESC(polled, "Use polling for completion instead of interrupts");
93 * struct dmatest_params - test parameters.
94 * @buf_size: size of the memcpy test buffer
95 * @channel: bus ID of the channel to test
96 * @device: bus ID of the DMA Engine to test
97 * @threads_per_chan: number of threads to start per channel
98 * @max_channels: maximum number of channels to use
99 * @iterations: iterations before stopping test
100 * @xor_sources: number of xor source buffers
101 * @pq_sources: number of p+q source buffers
102 * @timeout: transfer timeout in msec, -1 for infinite timeout
103 * @noverify: disable data verification
104 * @norandom: disable random offset setup
105 * @alignment: custom data address alignment taken as 2^alignment
106 * @transfer_size: custom transfer size in bytes
107 * @polled: use polling for completion instead of interrupts
109 struct dmatest_params {
110 unsigned int buf_size;
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;
122 unsigned int transfer_size;
127 * struct dmatest_info - test information.
128 * @params: test parameters
129 * @channels: channels under test
130 * @nr_channels: number of channels under test
131 * @lock: access protection to the fields of this structure
132 * @did_init: module has been initialized completely
133 * @last_error: test has faced configuration issues
135 static struct dmatest_info {
136 /* Test parameters */
137 struct dmatest_params params;
140 struct list_head channels;
141 unsigned int nr_channels;
146 .channels = LIST_HEAD_INIT(test_info.channels),
147 .lock = __MUTEX_INITIALIZER(test_info.lock),
150 static int dmatest_run_set(const char *val, const struct kernel_param *kp);
151 static int dmatest_run_get(char *val, const struct kernel_param *kp);
152 static const struct kernel_param_ops run_ops = {
153 .set = dmatest_run_set,
154 .get = dmatest_run_get,
156 static bool dmatest_run;
157 module_param_cb(run, &run_ops, &dmatest_run, S_IRUGO | S_IWUSR);
158 MODULE_PARM_DESC(run, "Run the test (default: false)");
160 static int dmatest_chan_set(const char *val, const struct kernel_param *kp);
161 static int dmatest_chan_get(char *val, const struct kernel_param *kp);
162 static const struct kernel_param_ops multi_chan_ops = {
163 .set = dmatest_chan_set,
164 .get = dmatest_chan_get,
167 static char test_channel[20];
168 static struct kparam_string newchan_kps = {
169 .string = test_channel,
172 module_param_cb(channel, &multi_chan_ops, &newchan_kps, 0644);
173 MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
175 static int dmatest_test_list_get(char *val, const struct kernel_param *kp);
176 static const struct kernel_param_ops test_list_ops = {
177 .get = dmatest_test_list_get,
179 module_param_cb(test_list, &test_list_ops, NULL, 0444);
180 MODULE_PARM_DESC(test_list, "Print current test list");
182 /* Maximum amount of mismatched bytes in buffer to print */
183 #define MAX_ERROR_COUNT 32
186 * Initialization patterns. All bytes in the source buffer has bit 7
187 * set, all bytes in the destination buffer has bit 7 cleared.
189 * Bit 6 is set for all bytes which are to be copied by the DMA
190 * engine. Bit 5 is set for all bytes which are to be overwritten by
193 * The remaining bits are the inverse of a counter which increments by
194 * one for each byte address.
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
203 /* Fixed point arithmetic ops */
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)
210 /* poor man's completion - we want to use wait_event_freezable() on it */
211 struct dmatest_done {
213 wait_queue_head_t *wait;
216 struct dmatest_data {
223 struct 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;
237 struct dmatest_chan {
238 struct list_head node;
239 struct dma_chan *chan;
240 struct list_head threads;
243 static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
246 static bool is_threaded_test_run(struct dmatest_info *info)
248 struct dmatest_chan *dtc;
250 list_for_each_entry(dtc, &info->channels, node) {
251 struct dmatest_thread *thread;
253 list_for_each_entry(thread, &dtc->threads, node) {
254 if (!thread->done && !thread->pending)
262 static bool is_threaded_test_pending(struct dmatest_info *info)
264 struct dmatest_chan *dtc;
266 list_for_each_entry(dtc, &info->channels, node) {
267 struct dmatest_thread *thread;
269 list_for_each_entry(thread, &dtc->threads, node) {
278 static int dmatest_wait_get(char *val, const struct kernel_param *kp)
280 struct dmatest_info *info = &test_info;
281 struct dmatest_params *params = &info->params;
283 if (params->iterations)
284 wait_event(thread_wait, !is_threaded_test_run(info));
286 return param_get_bool(val, kp);
289 static const struct kernel_param_ops wait_ops = {
290 .get = dmatest_wait_get,
291 .set = param_set_bool,
293 module_param_cb(wait, &wait_ops, &wait, S_IRUGO);
294 MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)");
296 static bool dmatest_match_channel(struct dmatest_params *params,
297 struct dma_chan *chan)
299 if (params->channel[0] == '\0')
301 return strcmp(dma_chan_name(chan), params->channel) == 0;
304 static bool dmatest_match_device(struct dmatest_params *params,
305 struct dma_device *device)
307 if (params->device[0] == '\0')
309 return strcmp(dev_name(device->dev), params->device) == 0;
312 static unsigned long dmatest_random(void)
316 prandom_bytes(&buf, sizeof(buf));
320 static inline u8 gen_inv_idx(u8 index, bool is_memset)
322 u8 val = is_memset ? PATTERN_MEMSET_IDX : index;
324 return ~val & PATTERN_COUNT_MASK;
327 static inline u8 gen_src_value(u8 index, bool is_memset)
329 return PATTERN_SRC | gen_inv_idx(index, is_memset);
332 static inline u8 gen_dst_value(u8 index, bool is_memset)
334 return PATTERN_DST | gen_inv_idx(index, is_memset);
337 static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
338 unsigned int buf_size, bool is_memset)
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);
354 static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
355 unsigned int buf_size, bool is_memset)
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) |
366 for ( ; i < buf_size; i++)
367 buf[i] = gen_dst_value(i, is_memset);
371 static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
372 unsigned int counter, bool is_srcbuf, bool is_memset)
374 u8 diff = actual ^ pattern;
375 u8 expected = pattern | gen_inv_idx(counter, is_memset);
376 const char *thread_name = current->comm;
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);
389 pr_warn("%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n",
390 thread_name, index, expected, actual);
393 static 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)
398 unsigned int error_count = 0;
402 unsigned int counter_orig = counter;
404 for (; (buf = *bufs); bufs++) {
405 counter = counter_orig;
406 for (i = start; i < end; 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,
420 if (error_count > MAX_ERROR_COUNT)
421 pr_warn("%s: %u errors suppressed\n",
422 current->comm, error_count - MAX_ERROR_COUNT);
428 static void dmatest_callback(void *arg)
430 struct dmatest_done *done = arg;
431 struct dmatest_thread *thread =
432 container_of(done, struct dmatest_thread, test_done);
435 wake_up_all(done->wait);
438 * If thread->done, it means that this callback occurred
439 * after the parent thread has cleaned up. This can
440 * happen in the case that driver doesn't implement
441 * the terminate_all() functionality and a dma operation
442 * did not occur within the timeout period
444 WARN(1, "dmatest: Kernel memory may be corrupted!!\n");
448 static unsigned int min_odd(unsigned int x, unsigned int y)
450 unsigned int val = min(x, y);
452 return val % 2 ? val : val - 1;
455 static void result(const char *err, unsigned int n, unsigned int src_off,
456 unsigned int dst_off, unsigned int len, unsigned long data)
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);
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);
467 static void dbg_result(const char *err, unsigned int n, unsigned int src_off,
468 unsigned int dst_off, unsigned int len,
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);
475 #define verbose_result(err, n, src_off, dst_off, len, data) ({ \
477 result(err, n, src_off, dst_off, len, data); \
479 dbg_result(err, n, src_off, dst_off, len, data);\
482 static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
484 unsigned long long per_sec = 1000000;
489 /* drop precision until runtime is 32-bits */
490 while (runtime > UINT_MAX) {
496 per_sec = INT_TO_FIXPT(per_sec);
497 do_div(per_sec, runtime);
502 static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
504 return FIXPT_TO_INT(dmatest_persec(runtime, len >> 10));
507 static void __dmatest_free_test_data(struct dmatest_data *d, unsigned int cnt)
511 for (i = 0; i < cnt; i++)
518 static void dmatest_free_test_data(struct dmatest_data *d)
520 __dmatest_free_test_data(d, d->cnt);
523 static int dmatest_alloc_test_data(struct dmatest_data *d,
524 unsigned int buf_size, u8 align)
528 d->raw = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
532 d->aligned = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
536 for (i = 0; i < d->cnt; i++) {
537 d->raw[i] = kmalloc(buf_size + align, GFP_KERNEL);
541 /* align to alignment restriction */
543 d->aligned[i] = PTR_ALIGN(d->raw[i], align);
545 d->aligned[i] = d->raw[i];
550 __dmatest_free_test_data(d, i);
555 * This function repeatedly tests DMA transfers of various lengths and
556 * offsets for a given operation type until it is told to exit by
557 * kthread_stop(). There may be multiple threads running this function
558 * in parallel for a single channel, and there may be multiple channels
559 * being tested in parallel.
561 * Before each test, the source and destination buffer is initialized
562 * with a known pattern. This pattern is different depending on
563 * whether it's in an area which is supposed to be copied or
564 * overwritten, and different in the source and destination buffers.
565 * So if the DMA engine doesn't copy exactly what we tell it to copy,
568 static int dmatest_func(void *data)
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 struct device *dma_dev;
577 unsigned int error_count;
578 unsigned int failed_tests = 0;
579 unsigned int total_tests = 0;
581 enum dma_status status;
582 enum dma_ctrl_flags flags;
585 unsigned int buf_size;
586 struct dmatest_data *src;
587 struct dmatest_data *dst;
589 ktime_t ktime, start, diff;
590 ktime_t filltime = 0;
591 ktime_t comparetime = 0;
593 unsigned long long total_len = 0;
594 unsigned long long iops = 0;
596 bool is_memset = false;
605 thread->pending = false;
607 params = &info->params;
610 dma_dev = dmaengine_get_dma_device(chan);
614 if (thread->type == DMA_MEMCPY) {
615 align = params->alignment < 0 ? dev->copy_align :
617 src->cnt = dst->cnt = 1;
618 } else if (thread->type == DMA_MEMSET) {
619 align = params->alignment < 0 ? dev->fill_align :
621 src->cnt = dst->cnt = 1;
623 } else if (thread->type == DMA_XOR) {
624 /* force odd to ensure dst = src */
625 src->cnt = min_odd(params->xor_sources | 1, dev->max_xor);
627 align = params->alignment < 0 ? dev->xor_align :
629 } else if (thread->type == DMA_PQ) {
630 /* force odd to ensure dst = src */
631 src->cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
633 align = params->alignment < 0 ? dev->pq_align :
636 pq_coefs = kmalloc(params->pq_sources + 1, GFP_KERNEL);
638 goto err_thread_type;
640 for (i = 0; i < src->cnt; i++)
643 goto err_thread_type;
645 /* Check if buffer count fits into map count variable (u8) */
646 if ((src->cnt + dst->cnt) >= 255) {
647 pr_err("too many buffers (%d of 255 supported)\n",
648 src->cnt + dst->cnt);
652 buf_size = params->buf_size;
653 if (1 << align > buf_size) {
654 pr_err("%u-byte buffer too small for %d-byte alignment\n",
655 buf_size, 1 << align);
659 if (dmatest_alloc_test_data(src, buf_size, align) < 0)
662 if (dmatest_alloc_test_data(dst, buf_size, align) < 0)
665 set_user_nice(current, 10);
667 srcs = kcalloc(src->cnt, sizeof(dma_addr_t), GFP_KERNEL);
671 dma_pq = kcalloc(dst->cnt, sizeof(dma_addr_t), GFP_KERNEL);
676 * src and dst buffers are freed by ourselves below
678 if (params->polled) {
679 flags = DMA_CTRL_ACK;
681 if (dma_has_cap(DMA_INTERRUPT, dev->cap_mask)) {
682 flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
684 pr_err("Channel does not support interrupt!\n");
690 while (!(kthread_should_stop() ||
691 (params->iterations && total_tests >= params->iterations))) {
692 struct dma_async_tx_descriptor *tx = NULL;
693 struct dmaengine_unmap_data *um;
699 if (params->transfer_size) {
700 if (params->transfer_size >= buf_size) {
701 pr_err("%u-byte transfer size must be lower than %u-buffer size\n",
702 params->transfer_size, buf_size);
705 len = params->transfer_size;
706 } else if (params->norandom) {
709 len = dmatest_random() % buf_size + 1;
712 /* Do not alter transfer size explicitly defined by user */
713 if (!params->transfer_size) {
714 len = (len >> align) << align;
720 if (params->norandom) {
724 src->off = dmatest_random() % (buf_size - len + 1);
725 dst->off = dmatest_random() % (buf_size - len + 1);
727 src->off = (src->off >> align) << align;
728 dst->off = (dst->off >> align) << align;
731 if (!params->noverify) {
733 dmatest_init_srcs(src->aligned, src->off, len,
734 buf_size, is_memset);
735 dmatest_init_dsts(dst->aligned, dst->off, len,
736 buf_size, is_memset);
738 diff = ktime_sub(ktime_get(), start);
739 filltime = ktime_add(filltime, diff);
742 um = dmaengine_get_unmap_data(dma_dev, src->cnt + dst->cnt,
746 result("unmap data NULL", total_tests,
747 src->off, dst->off, len, ret);
752 for (i = 0; i < src->cnt; i++) {
753 void *buf = src->aligned[i];
754 struct page *pg = virt_to_page(buf);
755 unsigned long pg_off = offset_in_page(buf);
757 um->addr[i] = dma_map_page(dma_dev, pg, pg_off,
758 um->len, DMA_TO_DEVICE);
759 srcs[i] = um->addr[i] + src->off;
760 ret = dma_mapping_error(dma_dev, um->addr[i]);
762 result("src mapping error", total_tests,
763 src->off, dst->off, len, ret);
764 goto error_unmap_continue;
768 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
769 dsts = &um->addr[src->cnt];
770 for (i = 0; i < dst->cnt; i++) {
771 void *buf = dst->aligned[i];
772 struct page *pg = virt_to_page(buf);
773 unsigned long pg_off = offset_in_page(buf);
775 dsts[i] = dma_map_page(dma_dev, pg, pg_off, um->len,
777 ret = dma_mapping_error(dma_dev, dsts[i]);
779 result("dst mapping error", total_tests,
780 src->off, dst->off, len, ret);
781 goto error_unmap_continue;
786 if (thread->type == DMA_MEMCPY)
787 tx = dev->device_prep_dma_memcpy(chan,
789 srcs[0], len, flags);
790 else if (thread->type == DMA_MEMSET)
791 tx = dev->device_prep_dma_memset(chan,
793 *(src->aligned[0] + src->off),
795 else if (thread->type == DMA_XOR)
796 tx = dev->device_prep_dma_xor(chan,
800 else if (thread->type == DMA_PQ) {
801 for (i = 0; i < dst->cnt; i++)
802 dma_pq[i] = dsts[i] + dst->off;
803 tx = dev->device_prep_dma_pq(chan, dma_pq, srcs,
809 result("prep error", total_tests, src->off,
812 goto error_unmap_continue;
816 if (!params->polled) {
817 tx->callback = dmatest_callback;
818 tx->callback_param = done;
820 cookie = tx->tx_submit(tx);
822 if (dma_submit_error(cookie)) {
823 result("submit error", total_tests, src->off,
826 goto error_unmap_continue;
829 if (params->polled) {
830 status = dma_sync_wait(chan, cookie);
831 dmaengine_terminate_sync(chan);
832 if (status == DMA_COMPLETE)
835 dma_async_issue_pending(chan);
837 wait_event_freezable_timeout(thread->done_wait,
839 msecs_to_jiffies(params->timeout));
841 status = dma_async_is_tx_complete(chan, cookie, NULL,
846 result("test timed out", total_tests, src->off, dst->off,
848 goto error_unmap_continue;
849 } else if (status != DMA_COMPLETE &&
850 !(dma_has_cap(DMA_COMPLETION_NO_ORDER,
852 status == DMA_OUT_OF_ORDER)) {
853 result(status == DMA_ERROR ?
854 "completion error status" :
855 "completion busy status", total_tests, src->off,
857 goto error_unmap_continue;
860 dmaengine_unmap_put(um);
862 if (params->noverify) {
863 verbose_result("test passed", total_tests, src->off,
869 pr_debug("%s: verifying source buffer...\n", current->comm);
870 error_count = dmatest_verify(src->aligned, 0, src->off,
871 0, PATTERN_SRC, true, is_memset);
872 error_count += dmatest_verify(src->aligned, src->off,
873 src->off + len, src->off,
874 PATTERN_SRC | PATTERN_COPY, true, is_memset);
875 error_count += dmatest_verify(src->aligned, src->off + len,
876 buf_size, src->off + len,
877 PATTERN_SRC, true, is_memset);
879 pr_debug("%s: verifying dest buffer...\n", current->comm);
880 error_count += dmatest_verify(dst->aligned, 0, dst->off,
881 0, PATTERN_DST, false, is_memset);
883 error_count += dmatest_verify(dst->aligned, dst->off,
884 dst->off + len, src->off,
885 PATTERN_SRC | PATTERN_COPY, false, is_memset);
887 error_count += dmatest_verify(dst->aligned, dst->off + len,
888 buf_size, dst->off + len,
889 PATTERN_DST, false, is_memset);
891 diff = ktime_sub(ktime_get(), start);
892 comparetime = ktime_add(comparetime, diff);
895 result("data error", total_tests, src->off, dst->off,
899 verbose_result("test passed", total_tests, src->off,
905 error_unmap_continue:
906 dmaengine_unmap_put(um);
909 ktime = ktime_sub(ktime_get(), ktime);
910 ktime = ktime_sub(ktime, comparetime);
911 ktime = ktime_sub(ktime, filltime);
912 runtime = ktime_to_us(ktime);
920 dmatest_free_test_data(dst);
922 dmatest_free_test_data(src);
926 iops = dmatest_persec(runtime, total_tests);
927 pr_info("%s: summary %u tests, %u failures %llu.%02llu iops %llu KB/s (%d)\n",
928 current->comm, total_tests, failed_tests,
929 FIXPT_TO_INT(iops), FIXPT_GET_FRAC(iops),
930 dmatest_KBs(runtime, total_len), ret);
932 /* terminate all transfers on specified channels */
933 if (ret || failed_tests)
934 dmaengine_terminate_sync(chan);
937 wake_up(&thread_wait);
942 static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
944 struct dmatest_thread *thread;
945 struct dmatest_thread *_thread;
948 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
949 ret = kthread_stop(thread->task);
950 pr_debug("thread %s exited with status %d\n",
951 thread->task->comm, ret);
952 list_del(&thread->node);
953 put_task_struct(thread->task);
957 /* terminate all transfers on specified channels */
958 dmaengine_terminate_sync(dtc->chan);
963 static int dmatest_add_threads(struct dmatest_info *info,
964 struct dmatest_chan *dtc, enum dma_transaction_type type)
966 struct dmatest_params *params = &info->params;
967 struct dmatest_thread *thread;
968 struct dma_chan *chan = dtc->chan;
972 if (type == DMA_MEMCPY)
974 else if (type == DMA_MEMSET)
976 else if (type == DMA_XOR)
978 else if (type == DMA_PQ)
983 for (i = 0; i < params->threads_per_chan; i++) {
984 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
986 pr_warn("No memory for %s-%s%u\n",
987 dma_chan_name(chan), op, i);
991 thread->chan = dtc->chan;
993 thread->test_done.wait = &thread->done_wait;
994 init_waitqueue_head(&thread->done_wait);
996 thread->task = kthread_create(dmatest_func, thread, "%s-%s%u",
997 dma_chan_name(chan), op, i);
998 if (IS_ERR(thread->task)) {
999 pr_warn("Failed to create thread %s-%s%u\n",
1000 dma_chan_name(chan), op, i);
1005 /* srcbuf and dstbuf are allocated by the thread itself */
1006 get_task_struct(thread->task);
1007 list_add_tail(&thread->node, &dtc->threads);
1008 thread->pending = true;
1014 static int dmatest_add_channel(struct dmatest_info *info,
1015 struct dma_chan *chan)
1017 struct dmatest_chan *dtc;
1018 struct dma_device *dma_dev = chan->device;
1019 unsigned int thread_count = 0;
1022 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
1024 pr_warn("No memory for %s\n", dma_chan_name(chan));
1029 INIT_LIST_HEAD(&dtc->threads);
1031 if (dma_has_cap(DMA_COMPLETION_NO_ORDER, dma_dev->cap_mask) &&
1032 info->params.polled) {
1033 info->params.polled = false;
1034 pr_warn("DMA_COMPLETION_NO_ORDER, polled disabled\n");
1037 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1039 cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
1040 thread_count += cnt > 0 ? cnt : 0;
1044 if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
1046 cnt = dmatest_add_threads(info, dtc, DMA_MEMSET);
1047 thread_count += cnt > 0 ? cnt : 0;
1051 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1052 cnt = dmatest_add_threads(info, dtc, DMA_XOR);
1053 thread_count += cnt > 0 ? cnt : 0;
1055 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1056 cnt = dmatest_add_threads(info, dtc, DMA_PQ);
1057 thread_count += cnt > 0 ? cnt : 0;
1060 pr_info("Added %u threads using %s\n",
1061 thread_count, dma_chan_name(chan));
1063 list_add_tail(&dtc->node, &info->channels);
1064 info->nr_channels++;
1069 static bool filter(struct dma_chan *chan, void *param)
1071 return dmatest_match_channel(param, chan) && dmatest_match_device(param, chan->device);
1074 static void request_channels(struct dmatest_info *info,
1075 enum dma_transaction_type type)
1077 dma_cap_mask_t mask;
1080 dma_cap_set(type, mask);
1082 struct dmatest_params *params = &info->params;
1083 struct dma_chan *chan;
1085 chan = dma_request_channel(mask, filter, params);
1087 if (dmatest_add_channel(info, chan)) {
1088 dma_release_channel(chan);
1089 break; /* add_channel failed, punt */
1092 break; /* no more channels available */
1093 if (params->max_channels &&
1094 info->nr_channels >= params->max_channels)
1095 break; /* we have all we need */
1099 static void add_threaded_test(struct dmatest_info *info)
1101 struct dmatest_params *params = &info->params;
1103 /* Copy test parameters */
1104 params->buf_size = test_buf_size;
1105 strlcpy(params->channel, strim(test_channel), sizeof(params->channel));
1106 strlcpy(params->device, strim(test_device), sizeof(params->device));
1107 params->threads_per_chan = threads_per_chan;
1108 params->max_channels = max_channels;
1109 params->iterations = iterations;
1110 params->xor_sources = xor_sources;
1111 params->pq_sources = pq_sources;
1112 params->timeout = timeout;
1113 params->noverify = noverify;
1114 params->norandom = norandom;
1115 params->alignment = alignment;
1116 params->transfer_size = transfer_size;
1117 params->polled = polled;
1119 request_channels(info, DMA_MEMCPY);
1120 request_channels(info, DMA_MEMSET);
1121 request_channels(info, DMA_XOR);
1122 request_channels(info, DMA_PQ);
1125 static void run_pending_tests(struct dmatest_info *info)
1127 struct dmatest_chan *dtc;
1128 unsigned int thread_count = 0;
1130 list_for_each_entry(dtc, &info->channels, node) {
1131 struct dmatest_thread *thread;
1134 list_for_each_entry(thread, &dtc->threads, node) {
1135 wake_up_process(thread->task);
1138 pr_info("Started %u threads using %s\n",
1139 thread_count, dma_chan_name(dtc->chan));
1143 static void stop_threaded_test(struct dmatest_info *info)
1145 struct dmatest_chan *dtc, *_dtc;
1146 struct dma_chan *chan;
1148 list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
1149 list_del(&dtc->node);
1151 dmatest_cleanup_channel(dtc);
1152 pr_debug("dropped channel %s\n", dma_chan_name(chan));
1153 dma_release_channel(chan);
1156 info->nr_channels = 0;
1159 static void start_threaded_tests(struct dmatest_info *info)
1161 /* we might be called early to set run=, defer running until all
1162 * parameters have been evaluated
1164 if (!info->did_init)
1167 run_pending_tests(info);
1170 static int dmatest_run_get(char *val, const struct kernel_param *kp)
1172 struct dmatest_info *info = &test_info;
1174 mutex_lock(&info->lock);
1175 if (is_threaded_test_run(info)) {
1178 if (!is_threaded_test_pending(info))
1179 stop_threaded_test(info);
1180 dmatest_run = false;
1182 mutex_unlock(&info->lock);
1184 return param_get_bool(val, kp);
1187 static int dmatest_run_set(const char *val, const struct kernel_param *kp)
1189 struct dmatest_info *info = &test_info;
1192 mutex_lock(&info->lock);
1193 ret = param_set_bool(val, kp);
1195 mutex_unlock(&info->lock);
1197 } else if (dmatest_run) {
1198 if (!is_threaded_test_pending(info)) {
1200 * We have nothing to run. This can be due to:
1202 ret = info->last_error;
1204 /* 1) Misconfiguration */
1205 pr_err("Channel misconfigured, can't continue\n");
1206 mutex_unlock(&info->lock);
1209 /* 2) We rely on defaults */
1210 pr_info("No channels configured, continue with any\n");
1211 if (!is_threaded_test_run(info))
1212 stop_threaded_test(info);
1213 add_threaded_test(info);
1216 start_threaded_tests(info);
1218 stop_threaded_test(info);
1221 mutex_unlock(&info->lock);
1226 static int dmatest_chan_set(const char *val, const struct kernel_param *kp)
1228 struct dmatest_info *info = &test_info;
1229 struct dmatest_chan *dtc;
1230 char chan_reset_val[20];
1233 mutex_lock(&info->lock);
1234 ret = param_set_copystring(val, kp);
1236 mutex_unlock(&info->lock);
1239 /*Clear any previously run threads */
1240 if (!is_threaded_test_run(info) && !is_threaded_test_pending(info))
1241 stop_threaded_test(info);
1242 /* Reject channels that are already registered */
1243 if (is_threaded_test_pending(info)) {
1244 list_for_each_entry(dtc, &info->channels, node) {
1245 if (strcmp(dma_chan_name(dtc->chan),
1246 strim(test_channel)) == 0) {
1247 dtc = list_last_entry(&info->channels,
1248 struct dmatest_chan,
1250 strlcpy(chan_reset_val,
1251 dma_chan_name(dtc->chan),
1252 sizeof(chan_reset_val));
1259 add_threaded_test(info);
1261 /* Check if channel was added successfully */
1262 if (!list_empty(&info->channels)) {
1264 * if new channel was not successfully added, revert the
1265 * "test_channel" string to the name of the last successfully
1266 * added channel. exception for when users issues empty string
1267 * to channel parameter.
1269 dtc = list_last_entry(&info->channels, struct dmatest_chan, node);
1270 if ((strcmp(dma_chan_name(dtc->chan), strim(test_channel)) != 0)
1271 && (strcmp("", strim(test_channel)) != 0)) {
1273 strlcpy(chan_reset_val, dma_chan_name(dtc->chan),
1274 sizeof(chan_reset_val));
1279 /* Clear test_channel if no channels were added successfully */
1280 strlcpy(chan_reset_val, "", sizeof(chan_reset_val));
1285 info->last_error = ret;
1286 mutex_unlock(&info->lock);
1291 param_set_copystring(chan_reset_val, kp);
1292 info->last_error = ret;
1293 mutex_unlock(&info->lock);
1298 static int dmatest_chan_get(char *val, const struct kernel_param *kp)
1300 struct dmatest_info *info = &test_info;
1302 mutex_lock(&info->lock);
1303 if (!is_threaded_test_run(info) && !is_threaded_test_pending(info)) {
1304 stop_threaded_test(info);
1305 strlcpy(test_channel, "", sizeof(test_channel));
1307 mutex_unlock(&info->lock);
1309 return param_get_string(val, kp);
1312 static int dmatest_test_list_get(char *val, const struct kernel_param *kp)
1314 struct dmatest_info *info = &test_info;
1315 struct dmatest_chan *dtc;
1316 unsigned int thread_count = 0;
1318 list_for_each_entry(dtc, &info->channels, node) {
1319 struct dmatest_thread *thread;
1322 list_for_each_entry(thread, &dtc->threads, node) {
1325 pr_info("%u threads using %s\n",
1326 thread_count, dma_chan_name(dtc->chan));
1332 static int __init dmatest_init(void)
1334 struct dmatest_info *info = &test_info;
1335 struct dmatest_params *params = &info->params;
1338 mutex_lock(&info->lock);
1339 add_threaded_test(info);
1340 run_pending_tests(info);
1341 mutex_unlock(&info->lock);
1344 if (params->iterations && wait)
1345 wait_event(thread_wait, !is_threaded_test_run(info));
1347 /* module parameters are stable, inittime tests are started,
1348 * let userspace take over 'run' control
1350 info->did_init = true;
1354 /* when compiled-in wait for drivers to load first */
1355 late_initcall(dmatest_init);
1357 static void __exit dmatest_exit(void)
1359 struct dmatest_info *info = &test_info;
1361 mutex_lock(&info->lock);
1362 stop_threaded_test(info);
1363 mutex_unlock(&info->lock);
1365 module_exit(dmatest_exit);
1367 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1368 MODULE_LICENSE("GPL v2");