Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * DMA Engine test module
4 *
5 * Copyright (C) 2007 Atmel Corporation
6 * Copyright (C) 2013 Intel Corporation
7 */
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/delay.h>
11#include <linux/dma-mapping.h>
12#include <linux/dmaengine.h>
13#include <linux/freezer.h>
14#include <linux/init.h>
15#include <linux/kthread.h>
16#include <linux/sched/task.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
23static unsigned int test_buf_size = 16384;
24module_param(test_buf_size, uint, S_IRUGO | S_IWUSR);
25MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
26
27static char test_device[32];
28module_param_string(device, test_device, sizeof(test_device),
29 S_IRUGO | S_IWUSR);
30MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
31
32static unsigned int threads_per_chan = 1;
33module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR);
34MODULE_PARM_DESC(threads_per_chan,
35 "Number of threads to start per channel (default: 1)");
36
37static unsigned int max_channels;
38module_param(max_channels, uint, S_IRUGO | S_IWUSR);
39MODULE_PARM_DESC(max_channels,
40 "Maximum number of channels to use (default: all)");
41
42static unsigned int iterations;
43module_param(iterations, uint, S_IRUGO | S_IWUSR);
44MODULE_PARM_DESC(iterations,
45 "Iterations before stopping test (default: infinite)");
46
47static unsigned int dmatest;
48module_param(dmatest, uint, S_IRUGO | S_IWUSR);
49MODULE_PARM_DESC(dmatest,
50 "dmatest 0-memcpy 1-memset (default: 0)");
51
52static unsigned int xor_sources = 3;
53module_param(xor_sources, uint, S_IRUGO | S_IWUSR);
54MODULE_PARM_DESC(xor_sources,
55 "Number of xor source buffers (default: 3)");
56
57static unsigned int pq_sources = 3;
58module_param(pq_sources, uint, S_IRUGO | S_IWUSR);
59MODULE_PARM_DESC(pq_sources,
60 "Number of p+q source buffers (default: 3)");
61
62static int timeout = 3000;
63module_param(timeout, uint, S_IRUGO | S_IWUSR);
64MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
65 "Pass 0xFFFFFFFF (4294967295) for maximum timeout");
66
67static bool noverify;
68module_param(noverify, bool, S_IRUGO | S_IWUSR);
69MODULE_PARM_DESC(noverify, "Disable data verification (default: verify)");
70
71static bool norandom;
72module_param(norandom, bool, 0644);
73MODULE_PARM_DESC(norandom, "Disable random offset setup (default: random)");
74
75static bool polled;
76module_param(polled, bool, S_IRUGO | S_IWUSR);
77MODULE_PARM_DESC(polled, "Use polling for completion instead of interrupts");
78
79static bool verbose;
80module_param(verbose, bool, S_IRUGO | S_IWUSR);
81MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)");
82
83static int alignment = -1;
84module_param(alignment, int, 0644);
85MODULE_PARM_DESC(alignment, "Custom data address alignment taken as 2^(alignment) (default: not used (-1))");
86
87static unsigned int transfer_size;
88module_param(transfer_size, uint, 0644);
89MODULE_PARM_DESC(transfer_size, "Optional custom transfer size in bytes (default: not used (0))");
90
91/**
92 * struct dmatest_params - test parameters.
93 * @buf_size: size of the memcpy test buffer
94 * @channel: bus ID of the channel to test
95 * @device: bus ID of the DMA Engine to test
96 * @threads_per_chan: number of threads to start per channel
97 * @max_channels: maximum number of channels to use
98 * @iterations: iterations before stopping test
99 * @xor_sources: number of xor source buffers
100 * @pq_sources: number of p+q source buffers
101 * @timeout: transfer timeout in msec, 0 - 0xFFFFFFFF (4294967295)
102 */
103struct dmatest_params {
104 unsigned int buf_size;
105 char channel[20];
106 char device[32];
107 unsigned int threads_per_chan;
108 unsigned int max_channels;
109 unsigned int iterations;
110 unsigned int xor_sources;
111 unsigned int pq_sources;
112 unsigned int timeout;
113 bool noverify;
114 bool norandom;
115 int alignment;
116 unsigned int transfer_size;
117 bool polled;
118};
119
120/**
121 * struct dmatest_info - test information.
122 * @params: test parameters
123 * @lock: access protection to the fields of this structure
124 */
125static struct dmatest_info {
126 /* Test parameters */
127 struct dmatest_params params;
128
129 /* Internal state */
130 struct list_head channels;
131 unsigned int nr_channels;
132 struct mutex lock;
133 bool did_init;
134} test_info = {
135 .channels = LIST_HEAD_INIT(test_info.channels),
136 .lock = __MUTEX_INITIALIZER(test_info.lock),
137};
138
139static int dmatest_run_set(const char *val, const struct kernel_param *kp);
140static int dmatest_run_get(char *val, const struct kernel_param *kp);
141static const struct kernel_param_ops run_ops = {
142 .set = dmatest_run_set,
143 .get = dmatest_run_get,
144};
145static bool dmatest_run;
146module_param_cb(run, &run_ops, &dmatest_run, S_IRUGO | S_IWUSR);
147MODULE_PARM_DESC(run, "Run the test (default: false)");
148
149static int dmatest_chan_set(const char *val, const struct kernel_param *kp);
150static int dmatest_chan_get(char *val, const struct kernel_param *kp);
151static const struct kernel_param_ops multi_chan_ops = {
152 .set = dmatest_chan_set,
153 .get = dmatest_chan_get,
154};
155
156static char test_channel[20];
157static struct kparam_string newchan_kps = {
158 .string = test_channel,
159 .maxlen = 20,
160};
161module_param_cb(channel, &multi_chan_ops, &newchan_kps, 0644);
162MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
163
164static int dmatest_test_list_get(char *val, const struct kernel_param *kp);
165static const struct kernel_param_ops test_list_ops = {
166 .get = dmatest_test_list_get,
167};
168module_param_cb(test_list, &test_list_ops, NULL, 0444);
169MODULE_PARM_DESC(test_list, "Print current test list");
170
171/* Maximum amount of mismatched bytes in buffer to print */
172#define MAX_ERROR_COUNT 32
173
174/*
175 * Initialization patterns. All bytes in the source buffer has bit 7
176 * set, all bytes in the destination buffer has bit 7 cleared.
177 *
178 * Bit 6 is set for all bytes which are to be copied by the DMA
179 * engine. Bit 5 is set for all bytes which are to be overwritten by
180 * the DMA engine.
181 *
182 * The remaining bits are the inverse of a counter which increments by
183 * one for each byte address.
184 */
185#define PATTERN_SRC 0x80
186#define PATTERN_DST 0x00
187#define PATTERN_COPY 0x40
188#define PATTERN_OVERWRITE 0x20
189#define PATTERN_COUNT_MASK 0x1f
190#define PATTERN_MEMSET_IDX 0x01
191
192/* Fixed point arithmetic ops */
193#define FIXPT_SHIFT 8
194#define FIXPNT_MASK 0xFF
195#define FIXPT_TO_INT(a) ((a) >> FIXPT_SHIFT)
196#define INT_TO_FIXPT(a) ((a) << FIXPT_SHIFT)
197#define FIXPT_GET_FRAC(a) ((((a) & FIXPNT_MASK) * 100) >> FIXPT_SHIFT)
198
199/* poor man's completion - we want to use wait_event_freezable() on it */
200struct dmatest_done {
201 bool done;
202 wait_queue_head_t *wait;
203};
204
205struct dmatest_data {
206 u8 **raw;
207 u8 **aligned;
208 unsigned int cnt;
209 unsigned int off;
210};
211
212struct dmatest_thread {
213 struct list_head node;
214 struct dmatest_info *info;
215 struct task_struct *task;
216 struct dma_chan *chan;
217 struct dmatest_data src;
218 struct dmatest_data dst;
219 enum dma_transaction_type type;
220 wait_queue_head_t done_wait;
221 struct dmatest_done test_done;
222 bool done;
223 bool pending;
224};
225
226struct dmatest_chan {
227 struct list_head node;
228 struct dma_chan *chan;
229 struct list_head threads;
230};
231
232static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
233static bool wait;
234
235static bool is_threaded_test_run(struct dmatest_info *info)
236{
237 struct dmatest_chan *dtc;
238
239 list_for_each_entry(dtc, &info->channels, node) {
240 struct dmatest_thread *thread;
241
242 list_for_each_entry(thread, &dtc->threads, node) {
243 if (!thread->done)
244 return true;
245 }
246 }
247
248 return false;
249}
250
251static bool is_threaded_test_pending(struct dmatest_info *info)
252{
253 struct dmatest_chan *dtc;
254
255 list_for_each_entry(dtc, &info->channels, node) {
256 struct dmatest_thread *thread;
257
258 list_for_each_entry(thread, &dtc->threads, node) {
259 if (thread->pending)
260 return true;
261 }
262 }
263
264 return false;
265}
266
267static int dmatest_wait_get(char *val, const struct kernel_param *kp)
268{
269 struct dmatest_info *info = &test_info;
270 struct dmatest_params *params = &info->params;
271
272 if (params->iterations)
273 wait_event(thread_wait, !is_threaded_test_run(info));
274 wait = true;
275 return param_get_bool(val, kp);
276}
277
278static const struct kernel_param_ops wait_ops = {
279 .get = dmatest_wait_get,
280 .set = param_set_bool,
281};
282module_param_cb(wait, &wait_ops, &wait, S_IRUGO);
283MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)");
284
285static bool dmatest_match_channel(struct dmatest_params *params,
286 struct dma_chan *chan)
287{
288 if (params->channel[0] == '\0')
289 return true;
290 return strcmp(dma_chan_name(chan), params->channel) == 0;
291}
292
293static bool dmatest_match_device(struct dmatest_params *params,
294 struct dma_device *device)
295{
296 if (params->device[0] == '\0')
297 return true;
298 return strcmp(dev_name(device->dev), params->device) == 0;
299}
300
301static unsigned long dmatest_random(void)
302{
303 unsigned long buf;
304
305 prandom_bytes(&buf, sizeof(buf));
306 return buf;
307}
308
309static inline u8 gen_inv_idx(u8 index, bool is_memset)
310{
311 u8 val = is_memset ? PATTERN_MEMSET_IDX : index;
312
313 return ~val & PATTERN_COUNT_MASK;
314}
315
316static inline u8 gen_src_value(u8 index, bool is_memset)
317{
318 return PATTERN_SRC | gen_inv_idx(index, is_memset);
319}
320
321static inline u8 gen_dst_value(u8 index, bool is_memset)
322{
323 return PATTERN_DST | gen_inv_idx(index, is_memset);
324}
325
326static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
327 unsigned int buf_size, bool is_memset)
328{
329 unsigned int i;
330 u8 *buf;
331
332 for (; (buf = *bufs); bufs++) {
333 for (i = 0; i < start; i++)
334 buf[i] = gen_src_value(i, is_memset);
335 for ( ; i < start + len; i++)
336 buf[i] = gen_src_value(i, is_memset) | PATTERN_COPY;
337 for ( ; i < buf_size; i++)
338 buf[i] = gen_src_value(i, is_memset);
339 buf++;
340 }
341}
342
343static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
344 unsigned int buf_size, bool is_memset)
345{
346 unsigned int i;
347 u8 *buf;
348
349 for (; (buf = *bufs); bufs++) {
350 for (i = 0; i < start; i++)
351 buf[i] = gen_dst_value(i, is_memset);
352 for ( ; i < start + len; i++)
353 buf[i] = gen_dst_value(i, is_memset) |
354 PATTERN_OVERWRITE;
355 for ( ; i < buf_size; i++)
356 buf[i] = gen_dst_value(i, is_memset);
357 }
358}
359
360static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
361 unsigned int counter, bool is_srcbuf, bool is_memset)
362{
363 u8 diff = actual ^ pattern;
364 u8 expected = pattern | gen_inv_idx(counter, is_memset);
365 const char *thread_name = current->comm;
366
367 if (is_srcbuf)
368 pr_warn("%s: srcbuf[0x%x] overwritten! Expected %02x, got %02x\n",
369 thread_name, index, expected, actual);
370 else if ((pattern & PATTERN_COPY)
371 && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
372 pr_warn("%s: dstbuf[0x%x] not copied! Expected %02x, got %02x\n",
373 thread_name, index, expected, actual);
374 else if (diff & PATTERN_SRC)
375 pr_warn("%s: dstbuf[0x%x] was copied! Expected %02x, got %02x\n",
376 thread_name, index, expected, actual);
377 else
378 pr_warn("%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n",
379 thread_name, index, expected, actual);
380}
381
382static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
383 unsigned int end, unsigned int counter, u8 pattern,
384 bool is_srcbuf, bool is_memset)
385{
386 unsigned int i;
387 unsigned int error_count = 0;
388 u8 actual;
389 u8 expected;
390 u8 *buf;
391 unsigned int counter_orig = counter;
392
393 for (; (buf = *bufs); bufs++) {
394 counter = counter_orig;
395 for (i = start; i < end; i++) {
396 actual = buf[i];
397 expected = pattern | gen_inv_idx(counter, is_memset);
398 if (actual != expected) {
399 if (error_count < MAX_ERROR_COUNT)
400 dmatest_mismatch(actual, pattern, i,
401 counter, is_srcbuf,
402 is_memset);
403 error_count++;
404 }
405 counter++;
406 }
407 }
408
409 if (error_count > MAX_ERROR_COUNT)
410 pr_warn("%s: %u errors suppressed\n",
411 current->comm, error_count - MAX_ERROR_COUNT);
412
413 return error_count;
414}
415
416
417static void dmatest_callback(void *arg)
418{
419 struct dmatest_done *done = arg;
420 struct dmatest_thread *thread =
421 container_of(done, struct dmatest_thread, test_done);
422 if (!thread->done) {
423 done->done = true;
424 wake_up_all(done->wait);
425 } else {
426 /*
427 * If thread->done, it means that this callback occurred
428 * after the parent thread has cleaned up. This can
429 * happen in the case that driver doesn't implement
430 * the terminate_all() functionality and a dma operation
431 * did not occur within the timeout period
432 */
433 WARN(1, "dmatest: Kernel memory may be corrupted!!\n");
434 }
435}
436
437static unsigned int min_odd(unsigned int x, unsigned int y)
438{
439 unsigned int val = min(x, y);
440
441 return val % 2 ? val : val - 1;
442}
443
444static void result(const char *err, unsigned int n, unsigned int src_off,
445 unsigned int dst_off, unsigned int len, unsigned long data)
446{
447 pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
448 current->comm, n, err, src_off, dst_off, len, data);
449}
450
451static void dbg_result(const char *err, unsigned int n, unsigned int src_off,
452 unsigned int dst_off, unsigned int len,
453 unsigned long data)
454{
455 pr_debug("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
456 current->comm, n, err, src_off, dst_off, len, data);
457}
458
459#define verbose_result(err, n, src_off, dst_off, len, data) ({ \
460 if (verbose) \
461 result(err, n, src_off, dst_off, len, data); \
462 else \
463 dbg_result(err, n, src_off, dst_off, len, data);\
464})
465
466static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
467{
468 unsigned long long per_sec = 1000000;
469
470 if (runtime <= 0)
471 return 0;
472
473 /* drop precision until runtime is 32-bits */
474 while (runtime > UINT_MAX) {
475 runtime >>= 1;
476 per_sec <<= 1;
477 }
478
479 per_sec *= val;
480 per_sec = INT_TO_FIXPT(per_sec);
481 do_div(per_sec, runtime);
482
483 return per_sec;
484}
485
486static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
487{
488 return FIXPT_TO_INT(dmatest_persec(runtime, len >> 10));
489}
490
491static void __dmatest_free_test_data(struct dmatest_data *d, unsigned int cnt)
492{
493 unsigned int i;
494
495 for (i = 0; i < cnt; i++)
496 kfree(d->raw[i]);
497
498 kfree(d->aligned);
499 kfree(d->raw);
500}
501
502static void dmatest_free_test_data(struct dmatest_data *d)
503{
504 __dmatest_free_test_data(d, d->cnt);
505}
506
507static int dmatest_alloc_test_data(struct dmatest_data *d,
508 unsigned int buf_size, u8 align)
509{
510 unsigned int i = 0;
511
512 d->raw = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
513 if (!d->raw)
514 return -ENOMEM;
515
516 d->aligned = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
517 if (!d->aligned)
518 goto err;
519
520 for (i = 0; i < d->cnt; i++) {
521 d->raw[i] = kmalloc(buf_size + align, GFP_KERNEL);
522 if (!d->raw[i])
523 goto err;
524
525 /* align to alignment restriction */
526 if (align)
527 d->aligned[i] = PTR_ALIGN(d->raw[i], align);
528 else
529 d->aligned[i] = d->raw[i];
530 }
531
532 return 0;
533err:
534 __dmatest_free_test_data(d, i);
535 return -ENOMEM;
536}
537
538/*
539 * This function repeatedly tests DMA transfers of various lengths and
540 * offsets for a given operation type until it is told to exit by
541 * kthread_stop(). There may be multiple threads running this function
542 * in parallel for a single channel, and there may be multiple channels
543 * being tested in parallel.
544 *
545 * Before each test, the source and destination buffer is initialized
546 * with a known pattern. This pattern is different depending on
547 * whether it's in an area which is supposed to be copied or
548 * overwritten, and different in the source and destination buffers.
549 * So if the DMA engine doesn't copy exactly what we tell it to copy,
550 * we'll notice.
551 */
552static int dmatest_func(void *data)
553{
554 struct dmatest_thread *thread = data;
555 struct dmatest_done *done = &thread->test_done;
556 struct dmatest_info *info;
557 struct dmatest_params *params;
558 struct dma_chan *chan;
559 struct dma_device *dev;
560 unsigned int error_count;
561 unsigned int failed_tests = 0;
562 unsigned int total_tests = 0;
563 dma_cookie_t cookie;
564 enum dma_status status;
565 enum dma_ctrl_flags flags;
566 u8 *pq_coefs = NULL;
567 int ret;
568 unsigned int buf_size;
569 struct dmatest_data *src;
570 struct dmatest_data *dst;
571 int i;
572 ktime_t ktime, start, diff;
573 ktime_t filltime = 0;
574 ktime_t comparetime = 0;
575 s64 runtime = 0;
576 unsigned long long total_len = 0;
577 unsigned long long iops = 0;
578 u8 align = 0;
579 bool is_memset = false;
580 dma_addr_t *srcs;
581 dma_addr_t *dma_pq;
582
583 set_freezable();
584
585 ret = -ENOMEM;
586
587 smp_rmb();
588 thread->pending = false;
589 info = thread->info;
590 params = &info->params;
591 chan = thread->chan;
592 dev = chan->device;
593 src = &thread->src;
594 dst = &thread->dst;
595 if (thread->type == DMA_MEMCPY) {
596 align = params->alignment < 0 ? dev->copy_align :
597 params->alignment;
598 src->cnt = dst->cnt = 1;
599 } else if (thread->type == DMA_MEMSET) {
600 align = params->alignment < 0 ? dev->fill_align :
601 params->alignment;
602 src->cnt = dst->cnt = 1;
603 is_memset = true;
604 } else if (thread->type == DMA_XOR) {
605 /* force odd to ensure dst = src */
606 src->cnt = min_odd(params->xor_sources | 1, dev->max_xor);
607 dst->cnt = 1;
608 align = params->alignment < 0 ? dev->xor_align :
609 params->alignment;
610 } else if (thread->type == DMA_PQ) {
611 /* force odd to ensure dst = src */
612 src->cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
613 dst->cnt = 2;
614 align = params->alignment < 0 ? dev->pq_align :
615 params->alignment;
616
617 pq_coefs = kmalloc(params->pq_sources + 1, GFP_KERNEL);
618 if (!pq_coefs)
619 goto err_thread_type;
620
621 for (i = 0; i < src->cnt; i++)
622 pq_coefs[i] = 1;
623 } else
624 goto err_thread_type;
625
626 /* Check if buffer count fits into map count variable (u8) */
627 if ((src->cnt + dst->cnt) >= 255) {
628 pr_err("too many buffers (%d of 255 supported)\n",
629 src->cnt + dst->cnt);
630 goto err_free_coefs;
631 }
632
633 buf_size = params->buf_size;
634 if (1 << align > buf_size) {
635 pr_err("%u-byte buffer too small for %d-byte alignment\n",
636 buf_size, 1 << align);
637 goto err_free_coefs;
638 }
639
640 if (dmatest_alloc_test_data(src, buf_size, align) < 0)
641 goto err_free_coefs;
642
643 if (dmatest_alloc_test_data(dst, buf_size, align) < 0)
644 goto err_src;
645
646 set_user_nice(current, 10);
647
648 srcs = kcalloc(src->cnt, sizeof(dma_addr_t), GFP_KERNEL);
649 if (!srcs)
650 goto err_dst;
651
652 dma_pq = kcalloc(dst->cnt, sizeof(dma_addr_t), GFP_KERNEL);
653 if (!dma_pq)
654 goto err_srcs_array;
655
656 /*
657 * src and dst buffers are freed by ourselves below
658 */
659 if (params->polled)
660 flags = DMA_CTRL_ACK;
661 else
662 flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
663
664 ktime = ktime_get();
665 while (!kthread_should_stop()
666 && !(params->iterations && total_tests >= params->iterations)) {
667 struct dma_async_tx_descriptor *tx = NULL;
668 struct dmaengine_unmap_data *um;
669 dma_addr_t *dsts;
670 unsigned int len;
671
672 total_tests++;
673
674 if (params->transfer_size) {
675 if (params->transfer_size >= buf_size) {
676 pr_err("%u-byte transfer size must be lower than %u-buffer size\n",
677 params->transfer_size, buf_size);
678 break;
679 }
680 len = params->transfer_size;
681 } else if (params->norandom) {
682 len = buf_size;
683 } else {
684 len = dmatest_random() % buf_size + 1;
685 }
686
687 /* Do not alter transfer size explicitly defined by user */
688 if (!params->transfer_size) {
689 len = (len >> align) << align;
690 if (!len)
691 len = 1 << align;
692 }
693 total_len += len;
694
695 if (params->norandom) {
696 src->off = 0;
697 dst->off = 0;
698 } else {
699 src->off = dmatest_random() % (buf_size - len + 1);
700 dst->off = dmatest_random() % (buf_size - len + 1);
701
702 src->off = (src->off >> align) << align;
703 dst->off = (dst->off >> align) << align;
704 }
705
706 if (!params->noverify) {
707 start = ktime_get();
708 dmatest_init_srcs(src->aligned, src->off, len,
709 buf_size, is_memset);
710 dmatest_init_dsts(dst->aligned, dst->off, len,
711 buf_size, is_memset);
712
713 diff = ktime_sub(ktime_get(), start);
714 filltime = ktime_add(filltime, diff);
715 }
716
717 um = dmaengine_get_unmap_data(dev->dev, src->cnt + dst->cnt,
718 GFP_KERNEL);
719 if (!um) {
720 failed_tests++;
721 result("unmap data NULL", total_tests,
722 src->off, dst->off, len, ret);
723 continue;
724 }
725
726 um->len = buf_size;
727 for (i = 0; i < src->cnt; i++) {
728 void *buf = src->aligned[i];
729 struct page *pg = virt_to_page(buf);
730 unsigned long pg_off = offset_in_page(buf);
731
732 um->addr[i] = dma_map_page(dev->dev, pg, pg_off,
733 um->len, DMA_TO_DEVICE);
734 srcs[i] = um->addr[i] + src->off;
735 ret = dma_mapping_error(dev->dev, um->addr[i]);
736 if (ret) {
737 result("src mapping error", total_tests,
738 src->off, dst->off, len, ret);
739 goto error_unmap_continue;
740 }
741 um->to_cnt++;
742 }
743 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
744 dsts = &um->addr[src->cnt];
745 for (i = 0; i < dst->cnt; i++) {
746 void *buf = dst->aligned[i];
747 struct page *pg = virt_to_page(buf);
748 unsigned long pg_off = offset_in_page(buf);
749
750 dsts[i] = dma_map_page(dev->dev, pg, pg_off, um->len,
751 DMA_BIDIRECTIONAL);
752 ret = dma_mapping_error(dev->dev, dsts[i]);
753 if (ret) {
754 result("dst mapping error", total_tests,
755 src->off, dst->off, len, ret);
756 goto error_unmap_continue;
757 }
758 um->bidi_cnt++;
759 }
760
761 if (thread->type == DMA_MEMCPY)
762 tx = dev->device_prep_dma_memcpy(chan,
763 dsts[0] + dst->off,
764 srcs[0], len, flags);
765 else if (thread->type == DMA_MEMSET)
766 tx = dev->device_prep_dma_memset(chan,
767 dsts[0] + dst->off,
768 *(src->aligned[0] + src->off),
769 len, flags);
770 else if (thread->type == DMA_XOR)
771 tx = dev->device_prep_dma_xor(chan,
772 dsts[0] + dst->off,
773 srcs, src->cnt,
774 len, flags);
775 else if (thread->type == DMA_PQ) {
776 for (i = 0; i < dst->cnt; i++)
777 dma_pq[i] = dsts[i] + dst->off;
778 tx = dev->device_prep_dma_pq(chan, dma_pq, srcs,
779 src->cnt, pq_coefs,
780 len, flags);
781 }
782
783 if (!tx) {
784 result("prep error", total_tests, src->off,
785 dst->off, len, ret);
786 msleep(100);
787 goto error_unmap_continue;
788 }
789
790 done->done = false;
791 if (!params->polled) {
792 tx->callback = dmatest_callback;
793 tx->callback_param = done;
794 }
795 cookie = tx->tx_submit(tx);
796
797 if (dma_submit_error(cookie)) {
798 result("submit error", total_tests, src->off,
799 dst->off, len, ret);
800 msleep(100);
801 goto error_unmap_continue;
802 }
803
804 if (params->polled) {
805 status = dma_sync_wait(chan, cookie);
806 dmaengine_terminate_sync(chan);
807 if (status == DMA_COMPLETE)
808 done->done = true;
809 } else {
810 dma_async_issue_pending(chan);
811
812 wait_event_freezable_timeout(thread->done_wait,
813 done->done,
814 msecs_to_jiffies(params->timeout));
815
816 status = dma_async_is_tx_complete(chan, cookie, NULL,
817 NULL);
818 }
819
820 if (!done->done) {
821 result("test timed out", total_tests, src->off, dst->off,
822 len, 0);
823 goto error_unmap_continue;
824 } else if (status != DMA_COMPLETE) {
825 result(status == DMA_ERROR ?
826 "completion error status" :
827 "completion busy status", total_tests, src->off,
828 dst->off, len, ret);
829 goto error_unmap_continue;
830 }
831
832 dmaengine_unmap_put(um);
833
834 if (params->noverify) {
835 verbose_result("test passed", total_tests, src->off,
836 dst->off, len, 0);
837 continue;
838 }
839
840 start = ktime_get();
841 pr_debug("%s: verifying source buffer...\n", current->comm);
842 error_count = dmatest_verify(src->aligned, 0, src->off,
843 0, PATTERN_SRC, true, is_memset);
844 error_count += dmatest_verify(src->aligned, src->off,
845 src->off + len, src->off,
846 PATTERN_SRC | PATTERN_COPY, true, is_memset);
847 error_count += dmatest_verify(src->aligned, src->off + len,
848 buf_size, src->off + len,
849 PATTERN_SRC, true, is_memset);
850
851 pr_debug("%s: verifying dest buffer...\n", current->comm);
852 error_count += dmatest_verify(dst->aligned, 0, dst->off,
853 0, PATTERN_DST, false, is_memset);
854
855 error_count += dmatest_verify(dst->aligned, dst->off,
856 dst->off + len, src->off,
857 PATTERN_SRC | PATTERN_COPY, false, is_memset);
858
859 error_count += dmatest_verify(dst->aligned, dst->off + len,
860 buf_size, dst->off + len,
861 PATTERN_DST, false, is_memset);
862
863 diff = ktime_sub(ktime_get(), start);
864 comparetime = ktime_add(comparetime, diff);
865
866 if (error_count) {
867 result("data error", total_tests, src->off, dst->off,
868 len, error_count);
869 failed_tests++;
870 } else {
871 verbose_result("test passed", total_tests, src->off,
872 dst->off, len, 0);
873 }
874
875 continue;
876
877error_unmap_continue:
878 dmaengine_unmap_put(um);
879 failed_tests++;
880 }
881 ktime = ktime_sub(ktime_get(), ktime);
882 ktime = ktime_sub(ktime, comparetime);
883 ktime = ktime_sub(ktime, filltime);
884 runtime = ktime_to_us(ktime);
885
886 ret = 0;
887 kfree(dma_pq);
888err_srcs_array:
889 kfree(srcs);
890err_dst:
891 dmatest_free_test_data(dst);
892err_src:
893 dmatest_free_test_data(src);
894err_free_coefs:
895 kfree(pq_coefs);
896err_thread_type:
897 iops = dmatest_persec(runtime, total_tests);
898 pr_info("%s: summary %u tests, %u failures %llu.%02llu iops %llu KB/s (%d)\n",
899 current->comm, total_tests, failed_tests,
900 FIXPT_TO_INT(iops), FIXPT_GET_FRAC(iops),
901 dmatest_KBs(runtime, total_len), ret);
902
903 /* terminate all transfers on specified channels */
904 if (ret || failed_tests)
905 dmaengine_terminate_sync(chan);
906
907 thread->done = true;
908 wake_up(&thread_wait);
909
910 return ret;
911}
912
913static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
914{
915 struct dmatest_thread *thread;
916 struct dmatest_thread *_thread;
917 int ret;
918
919 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
920 ret = kthread_stop(thread->task);
921 pr_debug("thread %s exited with status %d\n",
922 thread->task->comm, ret);
923 list_del(&thread->node);
924 put_task_struct(thread->task);
925 kfree(thread);
926 }
927
928 /* terminate all transfers on specified channels */
929 dmaengine_terminate_sync(dtc->chan);
930
931 kfree(dtc);
932}
933
934static int dmatest_add_threads(struct dmatest_info *info,
935 struct dmatest_chan *dtc, enum dma_transaction_type type)
936{
937 struct dmatest_params *params = &info->params;
938 struct dmatest_thread *thread;
939 struct dma_chan *chan = dtc->chan;
940 char *op;
941 unsigned int i;
942
943 if (type == DMA_MEMCPY)
944 op = "copy";
945 else if (type == DMA_MEMSET)
946 op = "set";
947 else if (type == DMA_XOR)
948 op = "xor";
949 else if (type == DMA_PQ)
950 op = "pq";
951 else
952 return -EINVAL;
953
954 for (i = 0; i < params->threads_per_chan; i++) {
955 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
956 if (!thread) {
957 pr_warn("No memory for %s-%s%u\n",
958 dma_chan_name(chan), op, i);
959 break;
960 }
961 thread->info = info;
962 thread->chan = dtc->chan;
963 thread->type = type;
964 thread->test_done.wait = &thread->done_wait;
965 init_waitqueue_head(&thread->done_wait);
966 smp_wmb();
967 thread->task = kthread_create(dmatest_func, thread, "%s-%s%u",
968 dma_chan_name(chan), op, i);
969 if (IS_ERR(thread->task)) {
970 pr_warn("Failed to create thread %s-%s%u\n",
971 dma_chan_name(chan), op, i);
972 kfree(thread);
973 break;
974 }
975
976 /* srcbuf and dstbuf are allocated by the thread itself */
977 get_task_struct(thread->task);
978 list_add_tail(&thread->node, &dtc->threads);
979 thread->pending = true;
980 }
981
982 return i;
983}
984
985static int dmatest_add_channel(struct dmatest_info *info,
986 struct dma_chan *chan)
987{
988 struct dmatest_chan *dtc;
989 struct dma_device *dma_dev = chan->device;
990 unsigned int thread_count = 0;
991 int cnt;
992
993 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
994 if (!dtc) {
995 pr_warn("No memory for %s\n", dma_chan_name(chan));
996 return -ENOMEM;
997 }
998
999 dtc->chan = chan;
1000 INIT_LIST_HEAD(&dtc->threads);
1001
1002 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1003 if (dmatest == 0) {
1004 cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
1005 thread_count += cnt > 0 ? cnt : 0;
1006 }
1007 }
1008
1009 if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
1010 if (dmatest == 1) {
1011 cnt = dmatest_add_threads(info, dtc, DMA_MEMSET);
1012 thread_count += cnt > 0 ? cnt : 0;
1013 }
1014 }
1015
1016 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1017 cnt = dmatest_add_threads(info, dtc, DMA_XOR);
1018 thread_count += cnt > 0 ? cnt : 0;
1019 }
1020 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1021 cnt = dmatest_add_threads(info, dtc, DMA_PQ);
1022 thread_count += cnt > 0 ? cnt : 0;
1023 }
1024
1025 pr_info("Added %u threads using %s\n",
1026 thread_count, dma_chan_name(chan));
1027
1028 list_add_tail(&dtc->node, &info->channels);
1029 info->nr_channels++;
1030
1031 return 0;
1032}
1033
1034static bool filter(struct dma_chan *chan, void *param)
1035{
1036 struct dmatest_params *params = param;
1037
1038 if (!dmatest_match_channel(params, chan) ||
1039 !dmatest_match_device(params, chan->device))
1040 return false;
1041 else
1042 return true;
1043}
1044
1045static void request_channels(struct dmatest_info *info,
1046 enum dma_transaction_type type)
1047{
1048 dma_cap_mask_t mask;
1049
1050 dma_cap_zero(mask);
1051 dma_cap_set(type, mask);
1052 for (;;) {
1053 struct dmatest_params *params = &info->params;
1054 struct dma_chan *chan;
1055
1056 chan = dma_request_channel(mask, filter, params);
1057 if (chan) {
1058 if (dmatest_add_channel(info, chan)) {
1059 dma_release_channel(chan);
1060 break; /* add_channel failed, punt */
1061 }
1062 } else
1063 break; /* no more channels available */
1064 if (params->max_channels &&
1065 info->nr_channels >= params->max_channels)
1066 break; /* we have all we need */
1067 }
1068}
1069
1070static void add_threaded_test(struct dmatest_info *info)
1071{
1072 struct dmatest_params *params = &info->params;
1073
1074 /* Copy test parameters */
1075 params->buf_size = test_buf_size;
1076 strlcpy(params->channel, strim(test_channel), sizeof(params->channel));
1077 strlcpy(params->device, strim(test_device), sizeof(params->device));
1078 params->threads_per_chan = threads_per_chan;
1079 params->max_channels = max_channels;
1080 params->iterations = iterations;
1081 params->xor_sources = xor_sources;
1082 params->pq_sources = pq_sources;
1083 params->timeout = timeout;
1084 params->noverify = noverify;
1085 params->norandom = norandom;
1086 params->alignment = alignment;
1087 params->transfer_size = transfer_size;
1088 params->polled = polled;
1089
1090 request_channels(info, DMA_MEMCPY);
1091 request_channels(info, DMA_MEMSET);
1092 request_channels(info, DMA_XOR);
1093 request_channels(info, DMA_PQ);
1094}
1095
1096static void run_pending_tests(struct dmatest_info *info)
1097{
1098 struct dmatest_chan *dtc;
1099 unsigned int thread_count = 0;
1100
1101 list_for_each_entry(dtc, &info->channels, node) {
1102 struct dmatest_thread *thread;
1103
1104 thread_count = 0;
1105 list_for_each_entry(thread, &dtc->threads, node) {
1106 wake_up_process(thread->task);
1107 thread_count++;
1108 }
1109 pr_info("Started %u threads using %s\n",
1110 thread_count, dma_chan_name(dtc->chan));
1111 }
1112}
1113
1114static void stop_threaded_test(struct dmatest_info *info)
1115{
1116 struct dmatest_chan *dtc, *_dtc;
1117 struct dma_chan *chan;
1118
1119 list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
1120 list_del(&dtc->node);
1121 chan = dtc->chan;
1122 dmatest_cleanup_channel(dtc);
1123 pr_debug("dropped channel %s\n", dma_chan_name(chan));
1124 dma_release_channel(chan);
1125 }
1126
1127 info->nr_channels = 0;
1128}
1129
1130static void start_threaded_tests(struct dmatest_info *info)
1131{
1132 /* we might be called early to set run=, defer running until all
1133 * parameters have been evaluated
1134 */
1135 if (!info->did_init)
1136 return;
1137
1138 run_pending_tests(info);
1139}
1140
1141static int dmatest_run_get(char *val, const struct kernel_param *kp)
1142{
1143 struct dmatest_info *info = &test_info;
1144
1145 mutex_lock(&info->lock);
1146 if (is_threaded_test_run(info)) {
1147 dmatest_run = true;
1148 } else {
1149 if (!is_threaded_test_pending(info))
1150 stop_threaded_test(info);
1151 dmatest_run = false;
1152 }
1153 mutex_unlock(&info->lock);
1154
1155 return param_get_bool(val, kp);
1156}
1157
1158static int dmatest_run_set(const char *val, const struct kernel_param *kp)
1159{
1160 struct dmatest_info *info = &test_info;
1161 int ret;
1162
1163 mutex_lock(&info->lock);
1164 ret = param_set_bool(val, kp);
1165 if (ret) {
1166 mutex_unlock(&info->lock);
1167 return ret;
1168 } else if (dmatest_run) {
1169 if (is_threaded_test_pending(info))
1170 start_threaded_tests(info);
1171 else
1172 pr_info("Could not start test, no channels configured\n");
1173 } else {
1174 stop_threaded_test(info);
1175 }
1176
1177 mutex_unlock(&info->lock);
1178
1179 return ret;
1180}
1181
1182static int dmatest_chan_set(const char *val, const struct kernel_param *kp)
1183{
1184 struct dmatest_info *info = &test_info;
1185 struct dmatest_chan *dtc;
1186 char chan_reset_val[20];
1187 int ret = 0;
1188
1189 mutex_lock(&info->lock);
1190 ret = param_set_copystring(val, kp);
1191 if (ret) {
1192 mutex_unlock(&info->lock);
1193 return ret;
1194 }
1195 /*Clear any previously run threads */
1196 if (!is_threaded_test_run(info) && !is_threaded_test_pending(info))
1197 stop_threaded_test(info);
1198 /* Reject channels that are already registered */
1199 if (is_threaded_test_pending(info)) {
1200 list_for_each_entry(dtc, &info->channels, node) {
1201 if (strcmp(dma_chan_name(dtc->chan),
1202 strim(test_channel)) == 0) {
1203 dtc = list_last_entry(&info->channels,
1204 struct dmatest_chan,
1205 node);
1206 strlcpy(chan_reset_val,
1207 dma_chan_name(dtc->chan),
1208 sizeof(chan_reset_val));
1209 ret = -EBUSY;
1210 goto add_chan_err;
1211 }
1212 }
1213 }
1214
1215 add_threaded_test(info);
1216
1217 /* Check if channel was added successfully */
1218 dtc = list_last_entry(&info->channels, struct dmatest_chan, node);
1219
1220 if (dtc->chan) {
1221 /*
1222 * if new channel was not successfully added, revert the
1223 * "test_channel" string to the name of the last successfully
1224 * added channel. exception for when users issues empty string
1225 * to channel parameter.
1226 */
1227 if ((strcmp(dma_chan_name(dtc->chan), strim(test_channel)) != 0)
1228 && (strcmp("", strim(test_channel)) != 0)) {
1229 ret = -EINVAL;
1230 strlcpy(chan_reset_val, dma_chan_name(dtc->chan),
1231 sizeof(chan_reset_val));
1232 goto add_chan_err;
1233 }
1234
1235 } else {
1236 /* Clear test_channel if no channels were added successfully */
1237 strlcpy(chan_reset_val, "", sizeof(chan_reset_val));
1238 ret = -EBUSY;
1239 goto add_chan_err;
1240 }
1241
1242 mutex_unlock(&info->lock);
1243
1244 return ret;
1245
1246add_chan_err:
1247 param_set_copystring(chan_reset_val, kp);
1248 mutex_unlock(&info->lock);
1249
1250 return ret;
1251}
1252
1253static int dmatest_chan_get(char *val, const struct kernel_param *kp)
1254{
1255 struct dmatest_info *info = &test_info;
1256
1257 mutex_lock(&info->lock);
1258 if (!is_threaded_test_run(info) && !is_threaded_test_pending(info)) {
1259 stop_threaded_test(info);
1260 strlcpy(test_channel, "", sizeof(test_channel));
1261 }
1262 mutex_unlock(&info->lock);
1263
1264 return param_get_string(val, kp);
1265}
1266
1267static int dmatest_test_list_get(char *val, const struct kernel_param *kp)
1268{
1269 struct dmatest_info *info = &test_info;
1270 struct dmatest_chan *dtc;
1271 unsigned int thread_count = 0;
1272
1273 list_for_each_entry(dtc, &info->channels, node) {
1274 struct dmatest_thread *thread;
1275
1276 thread_count = 0;
1277 list_for_each_entry(thread, &dtc->threads, node) {
1278 thread_count++;
1279 }
1280 pr_info("%u threads using %s\n",
1281 thread_count, dma_chan_name(dtc->chan));
1282 }
1283
1284 return 0;
1285}
1286
1287static int __init dmatest_init(void)
1288{
1289 struct dmatest_info *info = &test_info;
1290 struct dmatest_params *params = &info->params;
1291
1292 if (dmatest_run) {
1293 mutex_lock(&info->lock);
1294 add_threaded_test(info);
1295 run_pending_tests(info);
1296 mutex_unlock(&info->lock);
1297 }
1298
1299 if (params->iterations && wait)
1300 wait_event(thread_wait, !is_threaded_test_run(info));
1301
1302 /* module parameters are stable, inittime tests are started,
1303 * let userspace take over 'run' control
1304 */
1305 info->did_init = true;
1306
1307 return 0;
1308}
1309/* when compiled-in wait for drivers to load first */
1310late_initcall(dmatest_init);
1311
1312static void __exit dmatest_exit(void)
1313{
1314 struct dmatest_info *info = &test_info;
1315
1316 mutex_lock(&info->lock);
1317 stop_threaded_test(info);
1318 mutex_unlock(&info->lock);
1319}
1320module_exit(dmatest_exit);
1321
1322MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1323MODULE_LICENSE("GPL v2");
1/*
2 * DMA Engine test module
3 *
4 * Copyright (C) 2007 Atmel Corporation
5 * Copyright (C) 2013 Intel Corporation
6 *
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.
10 */
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/delay.h>
14#include <linux/dma-mapping.h>
15#include <linux/dmaengine.h>
16#include <linux/freezer.h>
17#include <linux/init.h>
18#include <linux/kthread.h>
19#include <linux/module.h>
20#include <linux/moduleparam.h>
21#include <linux/random.h>
22#include <linux/slab.h>
23#include <linux/wait.h>
24
25static unsigned int test_buf_size = 16384;
26module_param(test_buf_size, uint, S_IRUGO | S_IWUSR);
27MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
28
29static char test_channel[20];
30module_param_string(channel, test_channel, sizeof(test_channel),
31 S_IRUGO | S_IWUSR);
32MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
33
34static char test_device[32];
35module_param_string(device, test_device, sizeof(test_device),
36 S_IRUGO | S_IWUSR);
37MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
38
39static unsigned int threads_per_chan = 1;
40module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR);
41MODULE_PARM_DESC(threads_per_chan,
42 "Number of threads to start per channel (default: 1)");
43
44static unsigned int max_channels;
45module_param(max_channels, uint, S_IRUGO | S_IWUSR);
46MODULE_PARM_DESC(max_channels,
47 "Maximum number of channels to use (default: all)");
48
49static unsigned int iterations;
50module_param(iterations, uint, S_IRUGO | S_IWUSR);
51MODULE_PARM_DESC(iterations,
52 "Iterations before stopping test (default: infinite)");
53
54static unsigned int sg_buffers = 1;
55module_param(sg_buffers, uint, S_IRUGO | S_IWUSR);
56MODULE_PARM_DESC(sg_buffers,
57 "Number of scatter gather buffers (default: 1)");
58
59static unsigned int dmatest;
60module_param(dmatest, uint, S_IRUGO | S_IWUSR);
61MODULE_PARM_DESC(dmatest,
62 "dmatest 0-memcpy 1-slave_sg (default: 0)");
63
64static unsigned int xor_sources = 3;
65module_param(xor_sources, uint, S_IRUGO | S_IWUSR);
66MODULE_PARM_DESC(xor_sources,
67 "Number of xor source buffers (default: 3)");
68
69static unsigned int pq_sources = 3;
70module_param(pq_sources, uint, S_IRUGO | S_IWUSR);
71MODULE_PARM_DESC(pq_sources,
72 "Number of p+q source buffers (default: 3)");
73
74static int timeout = 3000;
75module_param(timeout, uint, S_IRUGO | S_IWUSR);
76MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
77 "Pass -1 for infinite timeout");
78
79static bool noverify;
80module_param(noverify, bool, S_IRUGO | S_IWUSR);
81MODULE_PARM_DESC(noverify, "Disable random data setup and verification");
82
83static bool verbose;
84module_param(verbose, bool, S_IRUGO | S_IWUSR);
85MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)");
86
87/**
88 * struct dmatest_params - test parameters.
89 * @buf_size: size of the memcpy test buffer
90 * @channel: bus ID of the channel to test
91 * @device: bus ID of the DMA Engine to test
92 * @threads_per_chan: number of threads to start per channel
93 * @max_channels: maximum number of channels to use
94 * @iterations: iterations before stopping test
95 * @xor_sources: number of xor source buffers
96 * @pq_sources: number of p+q source buffers
97 * @timeout: transfer timeout in msec, -1 for infinite timeout
98 */
99struct dmatest_params {
100 unsigned int buf_size;
101 char channel[20];
102 char device[32];
103 unsigned int threads_per_chan;
104 unsigned int max_channels;
105 unsigned int iterations;
106 unsigned int xor_sources;
107 unsigned int pq_sources;
108 int timeout;
109 bool noverify;
110};
111
112/**
113 * struct dmatest_info - test information.
114 * @params: test parameters
115 * @lock: access protection to the fields of this structure
116 */
117static struct dmatest_info {
118 /* Test parameters */
119 struct dmatest_params params;
120
121 /* Internal state */
122 struct list_head channels;
123 unsigned int nr_channels;
124 struct mutex lock;
125 bool did_init;
126} test_info = {
127 .channels = LIST_HEAD_INIT(test_info.channels),
128 .lock = __MUTEX_INITIALIZER(test_info.lock),
129};
130
131static int dmatest_run_set(const char *val, const struct kernel_param *kp);
132static int dmatest_run_get(char *val, const struct kernel_param *kp);
133static const struct kernel_param_ops run_ops = {
134 .set = dmatest_run_set,
135 .get = dmatest_run_get,
136};
137static bool dmatest_run;
138module_param_cb(run, &run_ops, &dmatest_run, S_IRUGO | S_IWUSR);
139MODULE_PARM_DESC(run, "Run the test (default: false)");
140
141/* Maximum amount of mismatched bytes in buffer to print */
142#define MAX_ERROR_COUNT 32
143
144/*
145 * Initialization patterns. All bytes in the source buffer has bit 7
146 * set, all bytes in the destination buffer has bit 7 cleared.
147 *
148 * Bit 6 is set for all bytes which are to be copied by the DMA
149 * engine. Bit 5 is set for all bytes which are to be overwritten by
150 * the DMA engine.
151 *
152 * The remaining bits are the inverse of a counter which increments by
153 * one for each byte address.
154 */
155#define PATTERN_SRC 0x80
156#define PATTERN_DST 0x00
157#define PATTERN_COPY 0x40
158#define PATTERN_OVERWRITE 0x20
159#define PATTERN_COUNT_MASK 0x1f
160
161struct dmatest_thread {
162 struct list_head node;
163 struct dmatest_info *info;
164 struct task_struct *task;
165 struct dma_chan *chan;
166 u8 **srcs;
167 u8 **usrcs;
168 u8 **dsts;
169 u8 **udsts;
170 enum dma_transaction_type type;
171 bool done;
172};
173
174struct dmatest_chan {
175 struct list_head node;
176 struct dma_chan *chan;
177 struct list_head threads;
178};
179
180static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
181static bool wait;
182
183static bool is_threaded_test_run(struct dmatest_info *info)
184{
185 struct dmatest_chan *dtc;
186
187 list_for_each_entry(dtc, &info->channels, node) {
188 struct dmatest_thread *thread;
189
190 list_for_each_entry(thread, &dtc->threads, node) {
191 if (!thread->done)
192 return true;
193 }
194 }
195
196 return false;
197}
198
199static int dmatest_wait_get(char *val, const struct kernel_param *kp)
200{
201 struct dmatest_info *info = &test_info;
202 struct dmatest_params *params = &info->params;
203
204 if (params->iterations)
205 wait_event(thread_wait, !is_threaded_test_run(info));
206 wait = true;
207 return param_get_bool(val, kp);
208}
209
210static const struct kernel_param_ops wait_ops = {
211 .get = dmatest_wait_get,
212 .set = param_set_bool,
213};
214module_param_cb(wait, &wait_ops, &wait, S_IRUGO);
215MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)");
216
217static bool dmatest_match_channel(struct dmatest_params *params,
218 struct dma_chan *chan)
219{
220 if (params->channel[0] == '\0')
221 return true;
222 return strcmp(dma_chan_name(chan), params->channel) == 0;
223}
224
225static bool dmatest_match_device(struct dmatest_params *params,
226 struct dma_device *device)
227{
228 if (params->device[0] == '\0')
229 return true;
230 return strcmp(dev_name(device->dev), params->device) == 0;
231}
232
233static unsigned long dmatest_random(void)
234{
235 unsigned long buf;
236
237 prandom_bytes(&buf, sizeof(buf));
238 return buf;
239}
240
241static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
242 unsigned int buf_size)
243{
244 unsigned int i;
245 u8 *buf;
246
247 for (; (buf = *bufs); bufs++) {
248 for (i = 0; i < start; i++)
249 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
250 for ( ; i < start + len; i++)
251 buf[i] = PATTERN_SRC | PATTERN_COPY
252 | (~i & PATTERN_COUNT_MASK);
253 for ( ; i < buf_size; i++)
254 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
255 buf++;
256 }
257}
258
259static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
260 unsigned int buf_size)
261{
262 unsigned int i;
263 u8 *buf;
264
265 for (; (buf = *bufs); bufs++) {
266 for (i = 0; i < start; i++)
267 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
268 for ( ; i < start + len; i++)
269 buf[i] = PATTERN_DST | PATTERN_OVERWRITE
270 | (~i & PATTERN_COUNT_MASK);
271 for ( ; i < buf_size; i++)
272 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
273 }
274}
275
276static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
277 unsigned int counter, bool is_srcbuf)
278{
279 u8 diff = actual ^ pattern;
280 u8 expected = pattern | (~counter & PATTERN_COUNT_MASK);
281 const char *thread_name = current->comm;
282
283 if (is_srcbuf)
284 pr_warn("%s: srcbuf[0x%x] overwritten! Expected %02x, got %02x\n",
285 thread_name, index, expected, actual);
286 else if ((pattern & PATTERN_COPY)
287 && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
288 pr_warn("%s: dstbuf[0x%x] not copied! Expected %02x, got %02x\n",
289 thread_name, index, expected, actual);
290 else if (diff & PATTERN_SRC)
291 pr_warn("%s: dstbuf[0x%x] was copied! Expected %02x, got %02x\n",
292 thread_name, index, expected, actual);
293 else
294 pr_warn("%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n",
295 thread_name, index, expected, actual);
296}
297
298static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
299 unsigned int end, unsigned int counter, u8 pattern,
300 bool is_srcbuf)
301{
302 unsigned int i;
303 unsigned int error_count = 0;
304 u8 actual;
305 u8 expected;
306 u8 *buf;
307 unsigned int counter_orig = counter;
308
309 for (; (buf = *bufs); bufs++) {
310 counter = counter_orig;
311 for (i = start; i < end; i++) {
312 actual = buf[i];
313 expected = pattern | (~counter & PATTERN_COUNT_MASK);
314 if (actual != expected) {
315 if (error_count < MAX_ERROR_COUNT)
316 dmatest_mismatch(actual, pattern, i,
317 counter, is_srcbuf);
318 error_count++;
319 }
320 counter++;
321 }
322 }
323
324 if (error_count > MAX_ERROR_COUNT)
325 pr_warn("%s: %u errors suppressed\n",
326 current->comm, error_count - MAX_ERROR_COUNT);
327
328 return error_count;
329}
330
331/* poor man's completion - we want to use wait_event_freezable() on it */
332struct dmatest_done {
333 bool done;
334 wait_queue_head_t *wait;
335};
336
337static void dmatest_callback(void *arg)
338{
339 struct dmatest_done *done = arg;
340
341 done->done = true;
342 wake_up_all(done->wait);
343}
344
345static unsigned int min_odd(unsigned int x, unsigned int y)
346{
347 unsigned int val = min(x, y);
348
349 return val % 2 ? val : val - 1;
350}
351
352static void result(const char *err, unsigned int n, unsigned int src_off,
353 unsigned int dst_off, unsigned int len, unsigned long data)
354{
355 pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
356 current->comm, n, err, src_off, dst_off, len, data);
357}
358
359static void dbg_result(const char *err, unsigned int n, unsigned int src_off,
360 unsigned int dst_off, unsigned int len,
361 unsigned long data)
362{
363 pr_debug("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
364 current->comm, n, err, src_off, dst_off, len, data);
365}
366
367#define verbose_result(err, n, src_off, dst_off, len, data) ({ \
368 if (verbose) \
369 result(err, n, src_off, dst_off, len, data); \
370 else \
371 dbg_result(err, n, src_off, dst_off, len, data);\
372})
373
374static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
375{
376 unsigned long long per_sec = 1000000;
377
378 if (runtime <= 0)
379 return 0;
380
381 /* drop precision until runtime is 32-bits */
382 while (runtime > UINT_MAX) {
383 runtime >>= 1;
384 per_sec <<= 1;
385 }
386
387 per_sec *= val;
388 do_div(per_sec, runtime);
389 return per_sec;
390}
391
392static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
393{
394 return dmatest_persec(runtime, len >> 10);
395}
396
397/*
398 * This function repeatedly tests DMA transfers of various lengths and
399 * offsets for a given operation type until it is told to exit by
400 * kthread_stop(). There may be multiple threads running this function
401 * in parallel for a single channel, and there may be multiple channels
402 * being tested in parallel.
403 *
404 * Before each test, the source and destination buffer is initialized
405 * with a known pattern. This pattern is different depending on
406 * whether it's in an area which is supposed to be copied or
407 * overwritten, and different in the source and destination buffers.
408 * So if the DMA engine doesn't copy exactly what we tell it to copy,
409 * we'll notice.
410 */
411static int dmatest_func(void *data)
412{
413 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait);
414 struct dmatest_thread *thread = data;
415 struct dmatest_done done = { .wait = &done_wait };
416 struct dmatest_info *info;
417 struct dmatest_params *params;
418 struct dma_chan *chan;
419 struct dma_device *dev;
420 unsigned int error_count;
421 unsigned int failed_tests = 0;
422 unsigned int total_tests = 0;
423 dma_cookie_t cookie;
424 enum dma_status status;
425 enum dma_ctrl_flags flags;
426 u8 *pq_coefs = NULL;
427 int ret;
428 int src_cnt;
429 int dst_cnt;
430 int i;
431 ktime_t ktime, start, diff;
432 ktime_t filltime = 0;
433 ktime_t comparetime = 0;
434 s64 runtime = 0;
435 unsigned long long total_len = 0;
436 u8 align = 0;
437
438 set_freezable();
439
440 ret = -ENOMEM;
441
442 smp_rmb();
443 info = thread->info;
444 params = &info->params;
445 chan = thread->chan;
446 dev = chan->device;
447 if (thread->type == DMA_MEMCPY) {
448 align = dev->copy_align;
449 src_cnt = dst_cnt = 1;
450 } else if (thread->type == DMA_SG) {
451 align = dev->copy_align;
452 src_cnt = dst_cnt = sg_buffers;
453 } else if (thread->type == DMA_XOR) {
454 /* force odd to ensure dst = src */
455 src_cnt = min_odd(params->xor_sources | 1, dev->max_xor);
456 dst_cnt = 1;
457 align = dev->xor_align;
458 } else if (thread->type == DMA_PQ) {
459 /* force odd to ensure dst = src */
460 src_cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
461 dst_cnt = 2;
462 align = dev->pq_align;
463
464 pq_coefs = kmalloc(params->pq_sources + 1, GFP_KERNEL);
465 if (!pq_coefs)
466 goto err_thread_type;
467
468 for (i = 0; i < src_cnt; i++)
469 pq_coefs[i] = 1;
470 } else
471 goto err_thread_type;
472
473 thread->srcs = kcalloc(src_cnt + 1, sizeof(u8 *), GFP_KERNEL);
474 if (!thread->srcs)
475 goto err_srcs;
476
477 thread->usrcs = kcalloc(src_cnt + 1, sizeof(u8 *), GFP_KERNEL);
478 if (!thread->usrcs)
479 goto err_usrcs;
480
481 for (i = 0; i < src_cnt; i++) {
482 thread->usrcs[i] = kmalloc(params->buf_size + align,
483 GFP_KERNEL);
484 if (!thread->usrcs[i])
485 goto err_srcbuf;
486
487 /* align srcs to alignment restriction */
488 if (align)
489 thread->srcs[i] = PTR_ALIGN(thread->usrcs[i], align);
490 else
491 thread->srcs[i] = thread->usrcs[i];
492 }
493 thread->srcs[i] = NULL;
494
495 thread->dsts = kcalloc(dst_cnt + 1, sizeof(u8 *), GFP_KERNEL);
496 if (!thread->dsts)
497 goto err_dsts;
498
499 thread->udsts = kcalloc(dst_cnt + 1, sizeof(u8 *), GFP_KERNEL);
500 if (!thread->udsts)
501 goto err_udsts;
502
503 for (i = 0; i < dst_cnt; i++) {
504 thread->udsts[i] = kmalloc(params->buf_size + align,
505 GFP_KERNEL);
506 if (!thread->udsts[i])
507 goto err_dstbuf;
508
509 /* align dsts to alignment restriction */
510 if (align)
511 thread->dsts[i] = PTR_ALIGN(thread->udsts[i], align);
512 else
513 thread->dsts[i] = thread->udsts[i];
514 }
515 thread->dsts[i] = NULL;
516
517 set_user_nice(current, 10);
518
519 /*
520 * src and dst buffers are freed by ourselves below
521 */
522 flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
523
524 ktime = ktime_get();
525 while (!kthread_should_stop()
526 && !(params->iterations && total_tests >= params->iterations)) {
527 struct dma_async_tx_descriptor *tx = NULL;
528 struct dmaengine_unmap_data *um;
529 dma_addr_t srcs[src_cnt];
530 dma_addr_t *dsts;
531 unsigned int src_off, dst_off, len;
532 struct scatterlist tx_sg[src_cnt];
533 struct scatterlist rx_sg[src_cnt];
534
535 total_tests++;
536
537 if (1 << align > params->buf_size) {
538 pr_err("%u-byte buffer too small for %d-byte alignment\n",
539 params->buf_size, 1 << align);
540 break;
541 }
542
543 if (params->noverify)
544 len = params->buf_size;
545 else
546 len = dmatest_random() % params->buf_size + 1;
547
548 len = (len >> align) << align;
549 if (!len)
550 len = 1 << align;
551
552 total_len += len;
553
554 if (params->noverify) {
555 src_off = 0;
556 dst_off = 0;
557 } else {
558 start = ktime_get();
559 src_off = dmatest_random() % (params->buf_size - len + 1);
560 dst_off = dmatest_random() % (params->buf_size - len + 1);
561
562 src_off = (src_off >> align) << align;
563 dst_off = (dst_off >> align) << align;
564
565 dmatest_init_srcs(thread->srcs, src_off, len,
566 params->buf_size);
567 dmatest_init_dsts(thread->dsts, dst_off, len,
568 params->buf_size);
569
570 diff = ktime_sub(ktime_get(), start);
571 filltime = ktime_add(filltime, diff);
572 }
573
574 um = dmaengine_get_unmap_data(dev->dev, src_cnt + dst_cnt,
575 GFP_KERNEL);
576 if (!um) {
577 failed_tests++;
578 result("unmap data NULL", total_tests,
579 src_off, dst_off, len, ret);
580 continue;
581 }
582
583 um->len = params->buf_size;
584 for (i = 0; i < src_cnt; i++) {
585 void *buf = thread->srcs[i];
586 struct page *pg = virt_to_page(buf);
587 unsigned pg_off = (unsigned long) buf & ~PAGE_MASK;
588
589 um->addr[i] = dma_map_page(dev->dev, pg, pg_off,
590 um->len, DMA_TO_DEVICE);
591 srcs[i] = um->addr[i] + src_off;
592 ret = dma_mapping_error(dev->dev, um->addr[i]);
593 if (ret) {
594 dmaengine_unmap_put(um);
595 result("src mapping error", total_tests,
596 src_off, dst_off, len, ret);
597 failed_tests++;
598 continue;
599 }
600 um->to_cnt++;
601 }
602 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
603 dsts = &um->addr[src_cnt];
604 for (i = 0; i < dst_cnt; i++) {
605 void *buf = thread->dsts[i];
606 struct page *pg = virt_to_page(buf);
607 unsigned pg_off = (unsigned long) buf & ~PAGE_MASK;
608
609 dsts[i] = dma_map_page(dev->dev, pg, pg_off, um->len,
610 DMA_BIDIRECTIONAL);
611 ret = dma_mapping_error(dev->dev, dsts[i]);
612 if (ret) {
613 dmaengine_unmap_put(um);
614 result("dst mapping error", total_tests,
615 src_off, dst_off, len, ret);
616 failed_tests++;
617 continue;
618 }
619 um->bidi_cnt++;
620 }
621
622 sg_init_table(tx_sg, src_cnt);
623 sg_init_table(rx_sg, src_cnt);
624 for (i = 0; i < src_cnt; i++) {
625 sg_dma_address(&rx_sg[i]) = srcs[i];
626 sg_dma_address(&tx_sg[i]) = dsts[i] + dst_off;
627 sg_dma_len(&tx_sg[i]) = len;
628 sg_dma_len(&rx_sg[i]) = len;
629 }
630
631 if (thread->type == DMA_MEMCPY)
632 tx = dev->device_prep_dma_memcpy(chan,
633 dsts[0] + dst_off,
634 srcs[0], len, flags);
635 else if (thread->type == DMA_SG)
636 tx = dev->device_prep_dma_sg(chan, tx_sg, src_cnt,
637 rx_sg, src_cnt, flags);
638 else if (thread->type == DMA_XOR)
639 tx = dev->device_prep_dma_xor(chan,
640 dsts[0] + dst_off,
641 srcs, src_cnt,
642 len, flags);
643 else if (thread->type == DMA_PQ) {
644 dma_addr_t dma_pq[dst_cnt];
645
646 for (i = 0; i < dst_cnt; i++)
647 dma_pq[i] = dsts[i] + dst_off;
648 tx = dev->device_prep_dma_pq(chan, dma_pq, srcs,
649 src_cnt, pq_coefs,
650 len, flags);
651 }
652
653 if (!tx) {
654 dmaengine_unmap_put(um);
655 result("prep error", total_tests, src_off,
656 dst_off, len, ret);
657 msleep(100);
658 failed_tests++;
659 continue;
660 }
661
662 done.done = false;
663 tx->callback = dmatest_callback;
664 tx->callback_param = &done;
665 cookie = tx->tx_submit(tx);
666
667 if (dma_submit_error(cookie)) {
668 dmaengine_unmap_put(um);
669 result("submit error", total_tests, src_off,
670 dst_off, len, ret);
671 msleep(100);
672 failed_tests++;
673 continue;
674 }
675 dma_async_issue_pending(chan);
676
677 wait_event_freezable_timeout(done_wait, done.done,
678 msecs_to_jiffies(params->timeout));
679
680 status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
681
682 if (!done.done) {
683 /*
684 * We're leaving the timed out dma operation with
685 * dangling pointer to done_wait. To make this
686 * correct, we'll need to allocate wait_done for
687 * each test iteration and perform "who's gonna
688 * free it this time?" dancing. For now, just
689 * leave it dangling.
690 */
691 dmaengine_unmap_put(um);
692 result("test timed out", total_tests, src_off, dst_off,
693 len, 0);
694 failed_tests++;
695 continue;
696 } else if (status != DMA_COMPLETE) {
697 dmaengine_unmap_put(um);
698 result(status == DMA_ERROR ?
699 "completion error status" :
700 "completion busy status", total_tests, src_off,
701 dst_off, len, ret);
702 failed_tests++;
703 continue;
704 }
705
706 dmaengine_unmap_put(um);
707
708 if (params->noverify) {
709 verbose_result("test passed", total_tests, src_off,
710 dst_off, len, 0);
711 continue;
712 }
713
714 start = ktime_get();
715 pr_debug("%s: verifying source buffer...\n", current->comm);
716 error_count = dmatest_verify(thread->srcs, 0, src_off,
717 0, PATTERN_SRC, true);
718 error_count += dmatest_verify(thread->srcs, src_off,
719 src_off + len, src_off,
720 PATTERN_SRC | PATTERN_COPY, true);
721 error_count += dmatest_verify(thread->srcs, src_off + len,
722 params->buf_size, src_off + len,
723 PATTERN_SRC, true);
724
725 pr_debug("%s: verifying dest buffer...\n", current->comm);
726 error_count += dmatest_verify(thread->dsts, 0, dst_off,
727 0, PATTERN_DST, false);
728 error_count += dmatest_verify(thread->dsts, dst_off,
729 dst_off + len, src_off,
730 PATTERN_SRC | PATTERN_COPY, false);
731 error_count += dmatest_verify(thread->dsts, dst_off + len,
732 params->buf_size, dst_off + len,
733 PATTERN_DST, false);
734
735 diff = ktime_sub(ktime_get(), start);
736 comparetime = ktime_add(comparetime, diff);
737
738 if (error_count) {
739 result("data error", total_tests, src_off, dst_off,
740 len, error_count);
741 failed_tests++;
742 } else {
743 verbose_result("test passed", total_tests, src_off,
744 dst_off, len, 0);
745 }
746 }
747 ktime = ktime_sub(ktime_get(), ktime);
748 ktime = ktime_sub(ktime, comparetime);
749 ktime = ktime_sub(ktime, filltime);
750 runtime = ktime_to_us(ktime);
751
752 ret = 0;
753err_dstbuf:
754 for (i = 0; thread->udsts[i]; i++)
755 kfree(thread->udsts[i]);
756 kfree(thread->udsts);
757err_udsts:
758 kfree(thread->dsts);
759err_dsts:
760err_srcbuf:
761 for (i = 0; thread->usrcs[i]; i++)
762 kfree(thread->usrcs[i]);
763 kfree(thread->usrcs);
764err_usrcs:
765 kfree(thread->srcs);
766err_srcs:
767 kfree(pq_coefs);
768err_thread_type:
769 pr_info("%s: summary %u tests, %u failures %llu iops %llu KB/s (%d)\n",
770 current->comm, total_tests, failed_tests,
771 dmatest_persec(runtime, total_tests),
772 dmatest_KBs(runtime, total_len), ret);
773
774 /* terminate all transfers on specified channels */
775 if (ret)
776 dmaengine_terminate_all(chan);
777
778 thread->done = true;
779 wake_up(&thread_wait);
780
781 return ret;
782}
783
784static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
785{
786 struct dmatest_thread *thread;
787 struct dmatest_thread *_thread;
788 int ret;
789
790 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
791 ret = kthread_stop(thread->task);
792 pr_debug("thread %s exited with status %d\n",
793 thread->task->comm, ret);
794 list_del(&thread->node);
795 put_task_struct(thread->task);
796 kfree(thread);
797 }
798
799 /* terminate all transfers on specified channels */
800 dmaengine_terminate_all(dtc->chan);
801
802 kfree(dtc);
803}
804
805static int dmatest_add_threads(struct dmatest_info *info,
806 struct dmatest_chan *dtc, enum dma_transaction_type type)
807{
808 struct dmatest_params *params = &info->params;
809 struct dmatest_thread *thread;
810 struct dma_chan *chan = dtc->chan;
811 char *op;
812 unsigned int i;
813
814 if (type == DMA_MEMCPY)
815 op = "copy";
816 else if (type == DMA_SG)
817 op = "sg";
818 else if (type == DMA_XOR)
819 op = "xor";
820 else if (type == DMA_PQ)
821 op = "pq";
822 else
823 return -EINVAL;
824
825 for (i = 0; i < params->threads_per_chan; i++) {
826 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
827 if (!thread) {
828 pr_warn("No memory for %s-%s%u\n",
829 dma_chan_name(chan), op, i);
830 break;
831 }
832 thread->info = info;
833 thread->chan = dtc->chan;
834 thread->type = type;
835 smp_wmb();
836 thread->task = kthread_create(dmatest_func, thread, "%s-%s%u",
837 dma_chan_name(chan), op, i);
838 if (IS_ERR(thread->task)) {
839 pr_warn("Failed to create thread %s-%s%u\n",
840 dma_chan_name(chan), op, i);
841 kfree(thread);
842 break;
843 }
844
845 /* srcbuf and dstbuf are allocated by the thread itself */
846 get_task_struct(thread->task);
847 list_add_tail(&thread->node, &dtc->threads);
848 wake_up_process(thread->task);
849 }
850
851 return i;
852}
853
854static int dmatest_add_channel(struct dmatest_info *info,
855 struct dma_chan *chan)
856{
857 struct dmatest_chan *dtc;
858 struct dma_device *dma_dev = chan->device;
859 unsigned int thread_count = 0;
860 int cnt;
861
862 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
863 if (!dtc) {
864 pr_warn("No memory for %s\n", dma_chan_name(chan));
865 return -ENOMEM;
866 }
867
868 dtc->chan = chan;
869 INIT_LIST_HEAD(&dtc->threads);
870
871 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
872 if (dmatest == 0) {
873 cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
874 thread_count += cnt > 0 ? cnt : 0;
875 }
876 }
877
878 if (dma_has_cap(DMA_SG, dma_dev->cap_mask)) {
879 if (dmatest == 1) {
880 cnt = dmatest_add_threads(info, dtc, DMA_SG);
881 thread_count += cnt > 0 ? cnt : 0;
882 }
883 }
884
885 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
886 cnt = dmatest_add_threads(info, dtc, DMA_XOR);
887 thread_count += cnt > 0 ? cnt : 0;
888 }
889 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
890 cnt = dmatest_add_threads(info, dtc, DMA_PQ);
891 thread_count += cnt > 0 ? cnt : 0;
892 }
893
894 pr_info("Started %u threads using %s\n",
895 thread_count, dma_chan_name(chan));
896
897 list_add_tail(&dtc->node, &info->channels);
898 info->nr_channels++;
899
900 return 0;
901}
902
903static bool filter(struct dma_chan *chan, void *param)
904{
905 struct dmatest_params *params = param;
906
907 if (!dmatest_match_channel(params, chan) ||
908 !dmatest_match_device(params, chan->device))
909 return false;
910 else
911 return true;
912}
913
914static void request_channels(struct dmatest_info *info,
915 enum dma_transaction_type type)
916{
917 dma_cap_mask_t mask;
918
919 dma_cap_zero(mask);
920 dma_cap_set(type, mask);
921 for (;;) {
922 struct dmatest_params *params = &info->params;
923 struct dma_chan *chan;
924
925 chan = dma_request_channel(mask, filter, params);
926 if (chan) {
927 if (dmatest_add_channel(info, chan)) {
928 dma_release_channel(chan);
929 break; /* add_channel failed, punt */
930 }
931 } else
932 break; /* no more channels available */
933 if (params->max_channels &&
934 info->nr_channels >= params->max_channels)
935 break; /* we have all we need */
936 }
937}
938
939static void run_threaded_test(struct dmatest_info *info)
940{
941 struct dmatest_params *params = &info->params;
942
943 /* Copy test parameters */
944 params->buf_size = test_buf_size;
945 strlcpy(params->channel, strim(test_channel), sizeof(params->channel));
946 strlcpy(params->device, strim(test_device), sizeof(params->device));
947 params->threads_per_chan = threads_per_chan;
948 params->max_channels = max_channels;
949 params->iterations = iterations;
950 params->xor_sources = xor_sources;
951 params->pq_sources = pq_sources;
952 params->timeout = timeout;
953 params->noverify = noverify;
954
955 request_channels(info, DMA_MEMCPY);
956 request_channels(info, DMA_XOR);
957 request_channels(info, DMA_SG);
958 request_channels(info, DMA_PQ);
959}
960
961static void stop_threaded_test(struct dmatest_info *info)
962{
963 struct dmatest_chan *dtc, *_dtc;
964 struct dma_chan *chan;
965
966 list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
967 list_del(&dtc->node);
968 chan = dtc->chan;
969 dmatest_cleanup_channel(dtc);
970 pr_debug("dropped channel %s\n", dma_chan_name(chan));
971 dma_release_channel(chan);
972 }
973
974 info->nr_channels = 0;
975}
976
977static void restart_threaded_test(struct dmatest_info *info, bool run)
978{
979 /* we might be called early to set run=, defer running until all
980 * parameters have been evaluated
981 */
982 if (!info->did_init)
983 return;
984
985 /* Stop any running test first */
986 stop_threaded_test(info);
987
988 /* Run test with new parameters */
989 run_threaded_test(info);
990}
991
992static int dmatest_run_get(char *val, const struct kernel_param *kp)
993{
994 struct dmatest_info *info = &test_info;
995
996 mutex_lock(&info->lock);
997 if (is_threaded_test_run(info)) {
998 dmatest_run = true;
999 } else {
1000 stop_threaded_test(info);
1001 dmatest_run = false;
1002 }
1003 mutex_unlock(&info->lock);
1004
1005 return param_get_bool(val, kp);
1006}
1007
1008static int dmatest_run_set(const char *val, const struct kernel_param *kp)
1009{
1010 struct dmatest_info *info = &test_info;
1011 int ret;
1012
1013 mutex_lock(&info->lock);
1014 ret = param_set_bool(val, kp);
1015 if (ret) {
1016 mutex_unlock(&info->lock);
1017 return ret;
1018 }
1019
1020 if (is_threaded_test_run(info))
1021 ret = -EBUSY;
1022 else if (dmatest_run)
1023 restart_threaded_test(info, dmatest_run);
1024
1025 mutex_unlock(&info->lock);
1026
1027 return ret;
1028}
1029
1030static int __init dmatest_init(void)
1031{
1032 struct dmatest_info *info = &test_info;
1033 struct dmatest_params *params = &info->params;
1034
1035 if (dmatest_run) {
1036 mutex_lock(&info->lock);
1037 run_threaded_test(info);
1038 mutex_unlock(&info->lock);
1039 }
1040
1041 if (params->iterations && wait)
1042 wait_event(thread_wait, !is_threaded_test_run(info));
1043
1044 /* module parameters are stable, inittime tests are started,
1045 * let userspace take over 'run' control
1046 */
1047 info->did_init = true;
1048
1049 return 0;
1050}
1051/* when compiled-in wait for drivers to load first */
1052late_initcall(dmatest_init);
1053
1054static void __exit dmatest_exit(void)
1055{
1056 struct dmatest_info *info = &test_info;
1057
1058 mutex_lock(&info->lock);
1059 stop_threaded_test(info);
1060 mutex_unlock(&info->lock);
1061}
1062module_exit(dmatest_exit);
1063
1064MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1065MODULE_LICENSE("GPL v2");