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Merge tag 'regmap-v3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[linux-2.6.git] / drivers / dma / dmatest.c
blobe88ded2c8d2f1bc8d73223ef2175fcbd391be5bf
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 #include <linux/delay.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/dmaengine.h>
14 #include <linux/freezer.h>
15 #include <linux/init.h>
16 #include <linux/kthread.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/random.h>
20 #include <linux/slab.h>
21 #include <linux/wait.h>
22 #include <linux/ctype.h>
23 #include <linux/debugfs.h>
24 #include <linux/uaccess.h>
25 #include <linux/seq_file.h>
26
27 static unsigned int test_buf_size = 16384;
28 module_param(test_buf_size, uint, S_IRUGO);
29 MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
30
31 static char test_channel[20];
32 module_param_string(channel, test_channel, sizeof(test_channel), S_IRUGO);
33 MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
34
35 static char test_device[20];
36 module_param_string(device, test_device, sizeof(test_device), S_IRUGO);
37 MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
38
39 static unsigned int threads_per_chan = 1;
40 module_param(threads_per_chan, uint, S_IRUGO);
41 MODULE_PARM_DESC(threads_per_chan,
42 "Number of threads to start per channel (default: 1)");
43
44 static unsigned int max_channels;
45 module_param(max_channels, uint, S_IRUGO);
46 MODULE_PARM_DESC(max_channels,
47 "Maximum number of channels to use (default: all)");
48
49 static unsigned int iterations;
50 module_param(iterations, uint, S_IRUGO);
51 MODULE_PARM_DESC(iterations,
52 "Iterations before stopping test (default: infinite)");
53
54 static unsigned int xor_sources = 3;
55 module_param(xor_sources, uint, S_IRUGO);
56 MODULE_PARM_DESC(xor_sources,
57 "Number of xor source buffers (default: 3)");
58
59 static unsigned int pq_sources = 3;
60 module_param(pq_sources, uint, S_IRUGO);
61 MODULE_PARM_DESC(pq_sources,
62 "Number of p+q source buffers (default: 3)");
63
64 static int timeout = 3000;
65 module_param(timeout, uint, S_IRUGO);
66 MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
67 "Pass -1 for infinite timeout");
68
69 /* Maximum amount of mismatched bytes in buffer to print */
70 #define MAX_ERROR_COUNT 32
71
72 /*
73 * Initialization patterns. All bytes in the source buffer has bit 7
74 * set, all bytes in the destination buffer has bit 7 cleared.
75 *
76 * Bit 6 is set for all bytes which are to be copied by the DMA
77 * engine. Bit 5 is set for all bytes which are to be overwritten by
78 * the DMA engine.
79 *
80 * The remaining bits are the inverse of a counter which increments by
81 * one for each byte address.
82 */
83 #define PATTERN_SRC 0x80
84 #define PATTERN_DST 0x00
85 #define PATTERN_COPY 0x40
86 #define PATTERN_OVERWRITE 0x20
87 #define PATTERN_COUNT_MASK 0x1f
88
89 enum dmatest_error_type {
90 DMATEST_ET_OK,
91 DMATEST_ET_MAP_SRC,
92 DMATEST_ET_MAP_DST,
93 DMATEST_ET_PREP,
94 DMATEST_ET_SUBMIT,
95 DMATEST_ET_TIMEOUT,
96 DMATEST_ET_DMA_ERROR,
97 DMATEST_ET_DMA_IN_PROGRESS,
98 DMATEST_ET_VERIFY,
99 DMATEST_ET_VERIFY_BUF,
100 };
101
102 struct dmatest_verify_buffer {
103 unsigned int index;
104 u8 expected;
105 u8 actual;
106 };
107
108 struct dmatest_verify_result {
109 unsigned int error_count;
110 struct dmatest_verify_buffer data[MAX_ERROR_COUNT];
111 u8 pattern;
112 bool is_srcbuf;
113 };
114
115 struct dmatest_thread_result {
116 struct list_head node;
117 unsigned int n;
118 unsigned int src_off;
119 unsigned int dst_off;
120 unsigned int len;
121 enum dmatest_error_type type;
122 union {
123 unsigned long data;
124 dma_cookie_t cookie;
125 enum dma_status status;
126 int error;
127 struct dmatest_verify_result *vr;
128 };
129 };
130
131 struct dmatest_result {
132 struct list_head node;
133 char *name;
134 struct list_head results;
135 };
136
137 struct dmatest_info;
138
139 struct dmatest_thread {
140 struct list_head node;
141 struct dmatest_info *info;
142 struct task_struct *task;
143 struct dma_chan *chan;
144 u8 **srcs;
145 u8 **dsts;
146 enum dma_transaction_type type;
147 bool done;
148 };
149
150 struct dmatest_chan {
151 struct list_head node;
152 struct dma_chan *chan;
153 struct list_head threads;
154 };
155
156 /**
157 * struct dmatest_params - test parameters.
158 * @buf_size: size of the memcpy test buffer
159 * @channel: bus ID of the channel to test
160 * @device: bus ID of the DMA Engine to test
161 * @threads_per_chan: number of threads to start per channel
162 * @max_channels: maximum number of channels to use
163 * @iterations: iterations before stopping test
164 * @xor_sources: number of xor source buffers
165 * @pq_sources: number of p+q source buffers
166 * @timeout: transfer timeout in msec, -1 for infinite timeout
167 */
168 struct dmatest_params {
169 unsigned int buf_size;
170 char channel[20];
171 char device[20];
172 unsigned int threads_per_chan;
173 unsigned int max_channels;
174 unsigned int iterations;
175 unsigned int xor_sources;
176 unsigned int pq_sources;
177 int timeout;
178 };
179
180 /**
181 * struct dmatest_info - test information.
182 * @params: test parameters
183 * @lock: access protection to the fields of this structure
184 */
185 struct dmatest_info {
186 /* Test parameters */
187 struct dmatest_params params;
188
189 /* Internal state */
190 struct list_head channels;
191 unsigned int nr_channels;
192 struct mutex lock;
193
194 /* debugfs related stuff */
195 struct dentry *root;
196 struct dmatest_params dbgfs_params;
197
198 /* Test results */
199 struct list_head results;
200 struct mutex results_lock;
201 };
202
203 static struct dmatest_info test_info;
204
205 static bool dmatest_match_channel(struct dmatest_params *params,
206 struct dma_chan *chan)
207 {
208 if (params->channel[0] == '\0')
209 return true;
210 return strcmp(dma_chan_name(chan), params->channel) == 0;
211 }
212
213 static bool dmatest_match_device(struct dmatest_params *params,
214 struct dma_device *device)
215 {
216 if (params->device[0] == '\0')
217 return true;
218 return strcmp(dev_name(device->dev), params->device) == 0;
219 }
220
221 static unsigned long dmatest_random(void)
222 {
223 unsigned long buf;
224
225 get_random_bytes(&buf, sizeof(buf));
226 return buf;
227 }
228
229 static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
230 unsigned int buf_size)
231 {
232 unsigned int i;
233 u8 *buf;
234
235 for (; (buf = *bufs); bufs++) {
236 for (i = 0; i < start; i++)
237 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
238 for ( ; i < start + len; i++)
239 buf[i] = PATTERN_SRC | PATTERN_COPY
240 | (~i & PATTERN_COUNT_MASK);
241 for ( ; i < buf_size; i++)
242 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
243 buf++;
244 }
245 }
246
247 static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
248 unsigned int buf_size)
249 {
250 unsigned int i;
251 u8 *buf;
252
253 for (; (buf = *bufs); bufs++) {
254 for (i = 0; i < start; i++)
255 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
256 for ( ; i < start + len; i++)
257 buf[i] = PATTERN_DST | PATTERN_OVERWRITE
258 | (~i & PATTERN_COUNT_MASK);
259 for ( ; i < buf_size; i++)
260 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
261 }
262 }
263
264 static unsigned int dmatest_verify(struct dmatest_verify_result *vr, u8 **bufs,
265 unsigned int start, unsigned int end, unsigned int counter,
266 u8 pattern, bool is_srcbuf)
267 {
268 unsigned int i;
269 unsigned int error_count = 0;
270 u8 actual;
271 u8 expected;
272 u8 *buf;
273 unsigned int counter_orig = counter;
274 struct dmatest_verify_buffer *vb;
275
276 for (; (buf = *bufs); bufs++) {
277 counter = counter_orig;
278 for (i = start; i < end; i++) {
279 actual = buf[i];
280 expected = pattern | (~counter & PATTERN_COUNT_MASK);
281 if (actual != expected) {
282 if (error_count < MAX_ERROR_COUNT && vr) {
283 vb = &vr->data[error_count];
284 vb->index = i;
285 vb->expected = expected;
286 vb->actual = actual;
287 }
288 error_count++;
289 }
290 counter++;
291 }
292 }
293
294 if (error_count > MAX_ERROR_COUNT)
295 pr_warning("%s: %u errors suppressed\n",
296 current->comm, error_count - MAX_ERROR_COUNT);
297
298 return error_count;
299 }
300
301 /* poor man's completion - we want to use wait_event_freezable() on it */
302 struct dmatest_done {
303 bool done;
304 wait_queue_head_t *wait;
305 };
306
307 static void dmatest_callback(void *arg)
308 {
309 struct dmatest_done *done = arg;
310
311 done->done = true;
312 wake_up_all(done->wait);
313 }
314
315 static inline void unmap_src(struct device *dev, dma_addr_t *addr, size_t len,
316 unsigned int count)
317 {
318 while (count--)
319 dma_unmap_single(dev, addr[count], len, DMA_TO_DEVICE);
320 }
321
322 static inline void unmap_dst(struct device *dev, dma_addr_t *addr, size_t len,
323 unsigned int count)
324 {
325 while (count--)
326 dma_unmap_single(dev, addr[count], len, DMA_BIDIRECTIONAL);
327 }
328
329 static unsigned int min_odd(unsigned int x, unsigned int y)
330 {
331 unsigned int val = min(x, y);
332
333 return val % 2 ? val : val - 1;
334 }
335
336 static char *verify_result_get_one(struct dmatest_verify_result *vr,
337 unsigned int i)
338 {
339 struct dmatest_verify_buffer *vb = &vr->data[i];
340 u8 diff = vb->actual ^ vr->pattern;
341 static char buf[512];
342 char *msg;
343
344 if (vr->is_srcbuf)
345 msg = "srcbuf overwritten!";
346 else if ((vr->pattern & PATTERN_COPY)
347 && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
348 msg = "dstbuf not copied!";
349 else if (diff & PATTERN_SRC)
350 msg = "dstbuf was copied!";
351 else
352 msg = "dstbuf mismatch!";
353
354 snprintf(buf, sizeof(buf) - 1, "%s [0x%x] Expected %02x, got %02x", msg,
355 vb->index, vb->expected, vb->actual);
356
357 return buf;
358 }
359
360 static char *thread_result_get(const char *name,
361 struct dmatest_thread_result *tr)
362 {
363 static const char * const messages[] = {
364 [DMATEST_ET_OK] = "No errors",
365 [DMATEST_ET_MAP_SRC] = "src mapping error",
366 [DMATEST_ET_MAP_DST] = "dst mapping error",
367 [DMATEST_ET_PREP] = "prep error",
368 [DMATEST_ET_SUBMIT] = "submit error",
369 [DMATEST_ET_TIMEOUT] = "test timed out",
370 [DMATEST_ET_DMA_ERROR] =
371 "got completion callback (DMA_ERROR)",
372 [DMATEST_ET_DMA_IN_PROGRESS] =
373 "got completion callback (DMA_IN_PROGRESS)",
374 [DMATEST_ET_VERIFY] = "errors",
375 [DMATEST_ET_VERIFY_BUF] = "verify errors",
376 };
377 static char buf[512];
378
379 snprintf(buf, sizeof(buf) - 1,
380 "%s: #%u: %s with src_off=0x%x ""dst_off=0x%x len=0x%x (%lu)",
381 name, tr->n, messages[tr->type], tr->src_off, tr->dst_off,
382 tr->len, tr->data);
383
384 return buf;
385 }
386
387 static int thread_result_add(struct dmatest_info *info,
388 struct dmatest_result *r, enum dmatest_error_type type,
389 unsigned int n, unsigned int src_off, unsigned int dst_off,
390 unsigned int len, unsigned long data)
391 {
392 struct dmatest_thread_result *tr;
393
394 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
395 if (!tr)
396 return -ENOMEM;
397
398 tr->type = type;
399 tr->n = n;
400 tr->src_off = src_off;
401 tr->dst_off = dst_off;
402 tr->len = len;
403 tr->data = data;
404
405 mutex_lock(&info->results_lock);
406 list_add_tail(&tr->node, &r->results);
407 mutex_unlock(&info->results_lock);
408
409 pr_warn("%s\n", thread_result_get(r->name, tr));
410 return 0;
411 }
412
413 static unsigned int verify_result_add(struct dmatest_info *info,
414 struct dmatest_result *r, unsigned int n,
415 unsigned int src_off, unsigned int dst_off, unsigned int len,
416 u8 **bufs, int whence, unsigned int counter, u8 pattern,
417 bool is_srcbuf)
418 {
419 struct dmatest_verify_result *vr;
420 unsigned int error_count;
421 unsigned int buf_off = is_srcbuf ? src_off : dst_off;
422 unsigned int start, end;
423
424 if (whence < 0) {
425 start = 0;
426 end = buf_off;
427 } else if (whence > 0) {
428 start = buf_off + len;
429 end = info->params.buf_size;
430 } else {
431 start = buf_off;
432 end = buf_off + len;
433 }
434
435 vr = kmalloc(sizeof(*vr), GFP_KERNEL);
436 if (!vr) {
437 pr_warn("dmatest: No memory to store verify result\n");
438 return dmatest_verify(NULL, bufs, start, end, counter, pattern,
439 is_srcbuf);
440 }
441
442 vr->pattern = pattern;
443 vr->is_srcbuf = is_srcbuf;
444
445 error_count = dmatest_verify(vr, bufs, start, end, counter, pattern,
446 is_srcbuf);
447 if (error_count) {
448 vr->error_count = error_count;
449 thread_result_add(info, r, DMATEST_ET_VERIFY_BUF, n, src_off,
450 dst_off, len, (unsigned long)vr);
451 return error_count;
452 }
453
454 kfree(vr);
455 return 0;
456 }
457
458 static void result_free(struct dmatest_info *info, const char *name)
459 {
460 struct dmatest_result *r, *_r;
461
462 mutex_lock(&info->results_lock);
463 list_for_each_entry_safe(r, _r, &info->results, node) {
464 struct dmatest_thread_result *tr, *_tr;
465
466 if (name && strcmp(r->name, name))
467 continue;
468
469 list_for_each_entry_safe(tr, _tr, &r->results, node) {
470 if (tr->type == DMATEST_ET_VERIFY_BUF)
471 kfree(tr->vr);
472 list_del(&tr->node);
473 kfree(tr);
474 }
475
476 kfree(r->name);
477 list_del(&r->node);
478 kfree(r);
479 }
480
481 mutex_unlock(&info->results_lock);
482 }
483
484 static struct dmatest_result *result_init(struct dmatest_info *info,
485 const char *name)
486 {
487 struct dmatest_result *r;
488
489 r = kzalloc(sizeof(*r), GFP_KERNEL);
490 if (r) {
491 r->name = kstrdup(name, GFP_KERNEL);
492 INIT_LIST_HEAD(&r->results);
493 mutex_lock(&info->results_lock);
494 list_add_tail(&r->node, &info->results);
495 mutex_unlock(&info->results_lock);
496 }
497 return r;
498 }
499
500 /*
501 * This function repeatedly tests DMA transfers of various lengths and
502 * offsets for a given operation type until it is told to exit by
503 * kthread_stop(). There may be multiple threads running this function
504 * in parallel for a single channel, and there may be multiple channels
505 * being tested in parallel.
506 *
507 * Before each test, the source and destination buffer is initialized
508 * with a known pattern. This pattern is different depending on
509 * whether it's in an area which is supposed to be copied or
510 * overwritten, and different in the source and destination buffers.
511 * So if the DMA engine doesn't copy exactly what we tell it to copy,
512 * we'll notice.
513 */
514 static int dmatest_func(void *data)
515 {
516 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait);
517 struct dmatest_thread *thread = data;
518 struct dmatest_done done = { .wait = &done_wait };
519 struct dmatest_info *info;
520 struct dmatest_params *params;
521 struct dma_chan *chan;
522 struct dma_device *dev;
523 const char *thread_name;
524 unsigned int src_off, dst_off, len;
525 unsigned int error_count;
526 unsigned int failed_tests = 0;
527 unsigned int total_tests = 0;
528 dma_cookie_t cookie;
529 enum dma_status status;
530 enum dma_ctrl_flags flags;
531 u8 *pq_coefs = NULL;
532 int ret;
533 int src_cnt;
534 int dst_cnt;
535 int i;
536 struct dmatest_result *result;
537
538 thread_name = current->comm;
539 set_freezable();
540
541 ret = -ENOMEM;
542
543 smp_rmb();
544 info = thread->info;
545 params = &info->params;
546 chan = thread->chan;
547 dev = chan->device;
548 if (thread->type == DMA_MEMCPY)
549 src_cnt = dst_cnt = 1;
550 else if (thread->type == DMA_XOR) {
551 /* force odd to ensure dst = src */
552 src_cnt = min_odd(params->xor_sources | 1, dev->max_xor);
553 dst_cnt = 1;
554 } else if (thread->type == DMA_PQ) {
555 /* force odd to ensure dst = src */
556 src_cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
557 dst_cnt = 2;
558
559 pq_coefs = kmalloc(params->pq_sources+1, GFP_KERNEL);
560 if (!pq_coefs)
561 goto err_thread_type;
562
563 for (i = 0; i < src_cnt; i++)
564 pq_coefs[i] = 1;
565 } else
566 goto err_thread_type;
567
568 result = result_init(info, thread_name);
569 if (!result)
570 goto err_srcs;
571
572 thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL);
573 if (!thread->srcs)
574 goto err_srcs;
575 for (i = 0; i < src_cnt; i++) {
576 thread->srcs[i] = kmalloc(params->buf_size, GFP_KERNEL);
577 if (!thread->srcs[i])
578 goto err_srcbuf;
579 }
580 thread->srcs[i] = NULL;
581
582 thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL);
583 if (!thread->dsts)
584 goto err_dsts;
585 for (i = 0; i < dst_cnt; i++) {
586 thread->dsts[i] = kmalloc(params->buf_size, GFP_KERNEL);
587 if (!thread->dsts[i])
588 goto err_dstbuf;
589 }
590 thread->dsts[i] = NULL;
591
592 set_user_nice(current, 10);
593
594 /*
595 * src buffers are freed by the DMAEngine code with dma_unmap_single()
596 * dst buffers are freed by ourselves below
597 */
598 flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT
599 | DMA_COMPL_SKIP_DEST_UNMAP | DMA_COMPL_SRC_UNMAP_SINGLE;
600
601 while (!kthread_should_stop()
602 && !(params->iterations && total_tests >= params->iterations)) {
603 struct dma_async_tx_descriptor *tx = NULL;
604 dma_addr_t dma_srcs[src_cnt];
605 dma_addr_t dma_dsts[dst_cnt];
606 u8 align = 0;
607
608 total_tests++;
609
610 /* honor alignment restrictions */
611 if (thread->type == DMA_MEMCPY)
612 align = dev->copy_align;
613 else if (thread->type == DMA_XOR)
614 align = dev->xor_align;
615 else if (thread->type == DMA_PQ)
616 align = dev->pq_align;
617
618 if (1 << align > params->buf_size) {
619 pr_err("%u-byte buffer too small for %d-byte alignment\n",
620 params->buf_size, 1 << align);
621 break;
622 }
623
624 len = dmatest_random() % params->buf_size + 1;
625 len = (len >> align) << align;
626 if (!len)
627 len = 1 << align;
628 src_off = dmatest_random() % (params->buf_size - len + 1);
629 dst_off = dmatest_random() % (params->buf_size - len + 1);
630
631 src_off = (src_off >> align) << align;
632 dst_off = (dst_off >> align) << align;
633
634 dmatest_init_srcs(thread->srcs, src_off, len, params->buf_size);
635 dmatest_init_dsts(thread->dsts, dst_off, len, params->buf_size);
636
637 for (i = 0; i < src_cnt; i++) {
638 u8 *buf = thread->srcs[i] + src_off;
639
640 dma_srcs[i] = dma_map_single(dev->dev, buf, len,
641 DMA_TO_DEVICE);
642 ret = dma_mapping_error(dev->dev, dma_srcs[i]);
643 if (ret) {
644 unmap_src(dev->dev, dma_srcs, len, i);
645 thread_result_add(info, result,
646 DMATEST_ET_MAP_SRC,
647 total_tests, src_off, dst_off,
648 len, ret);
649 failed_tests++;
650 continue;
651 }
652 }
653 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
654 for (i = 0; i < dst_cnt; i++) {
655 dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
656 params->buf_size,
657 DMA_BIDIRECTIONAL);
658 ret = dma_mapping_error(dev->dev, dma_dsts[i]);
659 if (ret) {
660 unmap_src(dev->dev, dma_srcs, len, src_cnt);
661 unmap_dst(dev->dev, dma_dsts, params->buf_size,
662 i);
663 thread_result_add(info, result,
664 DMATEST_ET_MAP_DST,
665 total_tests, src_off, dst_off,
666 len, ret);
667 failed_tests++;
668 continue;
669 }
670 }
671
672 if (thread->type == DMA_MEMCPY)
673 tx = dev->device_prep_dma_memcpy(chan,
674 dma_dsts[0] + dst_off,
675 dma_srcs[0], len,
676 flags);
677 else if (thread->type == DMA_XOR)
678 tx = dev->device_prep_dma_xor(chan,
679 dma_dsts[0] + dst_off,
680 dma_srcs, src_cnt,
681 len, flags);
682 else if (thread->type == DMA_PQ) {
683 dma_addr_t dma_pq[dst_cnt];
684
685 for (i = 0; i < dst_cnt; i++)
686 dma_pq[i] = dma_dsts[i] + dst_off;
687 tx = dev->device_prep_dma_pq(chan, dma_pq, dma_srcs,
688 src_cnt, pq_coefs,
689 len, flags);
690 }
691
692 if (!tx) {
693 unmap_src(dev->dev, dma_srcs, len, src_cnt);
694 unmap_dst(dev->dev, dma_dsts, params->buf_size,
695 dst_cnt);
696 thread_result_add(info, result, DMATEST_ET_PREP,
697 total_tests, src_off, dst_off,
698 len, 0);
699 msleep(100);
700 failed_tests++;
701 continue;
702 }
703
704 done.done = false;
705 tx->callback = dmatest_callback;
706 tx->callback_param = &done;
707 cookie = tx->tx_submit(tx);
708
709 if (dma_submit_error(cookie)) {
710 thread_result_add(info, result, DMATEST_ET_SUBMIT,
711 total_tests, src_off, dst_off,
712 len, cookie);
713 msleep(100);
714 failed_tests++;
715 continue;
716 }
717 dma_async_issue_pending(chan);
718
719 wait_event_freezable_timeout(done_wait, done.done,
720 msecs_to_jiffies(params->timeout));
721
722 status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
723
724 if (!done.done) {
725 /*
726 * We're leaving the timed out dma operation with
727 * dangling pointer to done_wait. To make this
728 * correct, we'll need to allocate wait_done for
729 * each test iteration and perform "who's gonna
730 * free it this time?" dancing. For now, just
731 * leave it dangling.
732 */
733 thread_result_add(info, result, DMATEST_ET_TIMEOUT,
734 total_tests, src_off, dst_off,
735 len, 0);
736 failed_tests++;
737 continue;
738 } else if (status != DMA_SUCCESS) {
739 enum dmatest_error_type type = (status == DMA_ERROR) ?
740 DMATEST_ET_DMA_ERROR : DMATEST_ET_DMA_IN_PROGRESS;
741 thread_result_add(info, result, type,
742 total_tests, src_off, dst_off,
743 len, status);
744 failed_tests++;
745 continue;
746 }
747
748 /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
749 unmap_dst(dev->dev, dma_dsts, params->buf_size, dst_cnt);
750
751 error_count = 0;
752
753 pr_debug("%s: verifying source buffer...\n", thread_name);
754 error_count += verify_result_add(info, result, total_tests,
755 src_off, dst_off, len, thread->srcs, -1,
756 0, PATTERN_SRC, true);
757 error_count += verify_result_add(info, result, total_tests,
758 src_off, dst_off, len, thread->srcs, 0,
759 src_off, PATTERN_SRC | PATTERN_COPY, true);
760 error_count += verify_result_add(info, result, total_tests,
761 src_off, dst_off, len, thread->srcs, 1,
762 src_off + len, PATTERN_SRC, true);
763
764 pr_debug("%s: verifying dest buffer...\n", thread_name);
765 error_count += verify_result_add(info, result, total_tests,
766 src_off, dst_off, len, thread->dsts, -1,
767 0, PATTERN_DST, false);
768 error_count += verify_result_add(info, result, total_tests,
769 src_off, dst_off, len, thread->dsts, 0,
770 src_off, PATTERN_SRC | PATTERN_COPY, false);
771 error_count += verify_result_add(info, result, total_tests,
772 src_off, dst_off, len, thread->dsts, 1,
773 dst_off + len, PATTERN_DST, false);
774
775 if (error_count) {
776 thread_result_add(info, result, DMATEST_ET_VERIFY,
777 total_tests, src_off, dst_off,
778 len, error_count);
779 failed_tests++;
780 } else {
781 thread_result_add(info, result, DMATEST_ET_OK,
782 total_tests, src_off, dst_off,
783 len, 0);
784 }
785 }
786
787 ret = 0;
788 for (i = 0; thread->dsts[i]; i++)
789 kfree(thread->dsts[i]);
790 err_dstbuf:
791 kfree(thread->dsts);
792 err_dsts:
793 for (i = 0; thread->srcs[i]; i++)
794 kfree(thread->srcs[i]);
795 err_srcbuf:
796 kfree(thread->srcs);
797 err_srcs:
798 kfree(pq_coefs);
799 err_thread_type:
800 pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
801 thread_name, total_tests, failed_tests, ret);
802
803 /* terminate all transfers on specified channels */
804 if (ret)
805 dmaengine_terminate_all(chan);
806
807 thread->done = true;
808
809 if (params->iterations > 0)
810 while (!kthread_should_stop()) {
811 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit);
812 interruptible_sleep_on(&wait_dmatest_exit);
813 }
814
815 return ret;
816 }
817
818 static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
819 {
820 struct dmatest_thread *thread;
821 struct dmatest_thread *_thread;
822 int ret;
823
824 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
825 ret = kthread_stop(thread->task);
826 pr_debug("dmatest: thread %s exited with status %d\n",
827 thread->task->comm, ret);
828 list_del(&thread->node);
829 kfree(thread);
830 }
831
832 /* terminate all transfers on specified channels */
833 dmaengine_terminate_all(dtc->chan);
834
835 kfree(dtc);
836 }
837
838 static int dmatest_add_threads(struct dmatest_info *info,
839 struct dmatest_chan *dtc, enum dma_transaction_type type)
840 {
841 struct dmatest_params *params = &info->params;
842 struct dmatest_thread *thread;
843 struct dma_chan *chan = dtc->chan;
844 char *op;
845 unsigned int i;
846
847 if (type == DMA_MEMCPY)
848 op = "copy";
849 else if (type == DMA_XOR)
850 op = "xor";
851 else if (type == DMA_PQ)
852 op = "pq";
853 else
854 return -EINVAL;
855
856 for (i = 0; i < params->threads_per_chan; i++) {
857 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
858 if (!thread) {
859 pr_warning("dmatest: No memory for %s-%s%u\n",
860 dma_chan_name(chan), op, i);
861
862 break;
863 }
864 thread->info = info;
865 thread->chan = dtc->chan;
866 thread->type = type;
867 smp_wmb();
868 thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
869 dma_chan_name(chan), op, i);
870 if (IS_ERR(thread->task)) {
871 pr_warning("dmatest: Failed to run thread %s-%s%u\n",
872 dma_chan_name(chan), op, i);
873 kfree(thread);
874 break;
875 }
876
877 /* srcbuf and dstbuf are allocated by the thread itself */
878
879 list_add_tail(&thread->node, &dtc->threads);
880 }
881
882 return i;
883 }
884
885 static int dmatest_add_channel(struct dmatest_info *info,
886 struct dma_chan *chan)
887 {
888 struct dmatest_chan *dtc;
889 struct dma_device *dma_dev = chan->device;
890 unsigned int thread_count = 0;
891 int cnt;
892
893 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
894 if (!dtc) {
895 pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
896 return -ENOMEM;
897 }
898
899 dtc->chan = chan;
900 INIT_LIST_HEAD(&dtc->threads);
901
902 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
903 cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
904 thread_count += cnt > 0 ? cnt : 0;
905 }
906 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
907 cnt = dmatest_add_threads(info, dtc, DMA_XOR);
908 thread_count += cnt > 0 ? cnt : 0;
909 }
910 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
911 cnt = dmatest_add_threads(info, dtc, DMA_PQ);
912 thread_count += cnt > 0 ? cnt : 0;
913 }
914
915 pr_info("dmatest: Started %u threads using %s\n",
916 thread_count, dma_chan_name(chan));
917
918 list_add_tail(&dtc->node, &info->channels);
919 info->nr_channels++;
920
921 return 0;
922 }
923
924 static bool filter(struct dma_chan *chan, void *param)
925 {
926 struct dmatest_params *params = param;
927
928 if (!dmatest_match_channel(params, chan) ||
929 !dmatest_match_device(params, chan->device))
930 return false;
931 else
932 return true;
933 }
934
935 static int __run_threaded_test(struct dmatest_info *info)
936 {
937 dma_cap_mask_t mask;
938 struct dma_chan *chan;
939 struct dmatest_params *params = &info->params;
940 int err = 0;
941
942 dma_cap_zero(mask);
943 dma_cap_set(DMA_MEMCPY, mask);
944 for (;;) {
945 chan = dma_request_channel(mask, filter, params);
946 if (chan) {
947 err = dmatest_add_channel(info, chan);
948 if (err) {
949 dma_release_channel(chan);
950 break; /* add_channel failed, punt */
951 }
952 } else
953 break; /* no more channels available */
954 if (params->max_channels &&
955 info->nr_channels >= params->max_channels)
956 break; /* we have all we need */
957 }
958 return err;
959 }
960
961 #ifndef MODULE
962 static int run_threaded_test(struct dmatest_info *info)
963 {
964 int ret;
965
966 mutex_lock(&info->lock);
967 ret = __run_threaded_test(info);
968 mutex_unlock(&info->lock);
969 return ret;
970 }
971 #endif
972
973 static void __stop_threaded_test(struct dmatest_info *info)
974 {
975 struct dmatest_chan *dtc, *_dtc;
976 struct dma_chan *chan;
977
978 list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
979 list_del(&dtc->node);
980 chan = dtc->chan;
981 dmatest_cleanup_channel(dtc);
982 pr_debug("dmatest: dropped channel %s\n", dma_chan_name(chan));
983 dma_release_channel(chan);
984 }
985
986 info->nr_channels = 0;
987 }
988
989 static void stop_threaded_test(struct dmatest_info *info)
990 {
991 mutex_lock(&info->lock);
992 __stop_threaded_test(info);
993 mutex_unlock(&info->lock);
994 }
995
996 static int __restart_threaded_test(struct dmatest_info *info, bool run)
997 {
998 struct dmatest_params *params = &info->params;
999
1000 /* Stop any running test first */
1001 __stop_threaded_test(info);
1002
1003 if (run == false)
1004 return 0;
1005
1006 /* Clear results from previous run */
1007 result_free(info, NULL);
1008
1009 /* Copy test parameters */
1010 memcpy(params, &info->dbgfs_params, sizeof(*params));
1011
1012 /* Run test with new parameters */
1013 return __run_threaded_test(info);
1014 }
1015
1016 static bool __is_threaded_test_run(struct dmatest_info *info)
1017 {
1018 struct dmatest_chan *dtc;
1019
1020 list_for_each_entry(dtc, &info->channels, node) {
1021 struct dmatest_thread *thread;
1022
1023 list_for_each_entry(thread, &dtc->threads, node) {
1024 if (!thread->done)
1025 return true;
1026 }
1027 }
1028
1029 return false;
1030 }
1031
1032 static ssize_t dtf_write_string(void *to, size_t available, loff_t *ppos,
1033 const void __user *from, size_t count)
1034 {
1035 char tmp[20];
1036 ssize_t len;
1037
1038 len = simple_write_to_buffer(tmp, sizeof(tmp) - 1, ppos, from, count);
1039 if (len >= 0) {
1040 tmp[len] = '\0';
1041 strlcpy(to, strim(tmp), available);
1042 }
1043
1044 return len;
1045 }
1046
1047 static ssize_t dtf_read_channel(struct file *file, char __user *buf,
1048 size_t count, loff_t *ppos)
1049 {
1050 struct dmatest_info *info = file->private_data;
1051 return simple_read_from_buffer(buf, count, ppos,
1052 info->dbgfs_params.channel,
1053 strlen(info->dbgfs_params.channel));
1054 }
1055
1056 static ssize_t dtf_write_channel(struct file *file, const char __user *buf,
1057 size_t size, loff_t *ppos)
1058 {
1059 struct dmatest_info *info = file->private_data;
1060 return dtf_write_string(info->dbgfs_params.channel,
1061 sizeof(info->dbgfs_params.channel),
1062 ppos, buf, size);
1063 }
1064
1065 static const struct file_operations dtf_channel_fops = {
1066 .read = dtf_read_channel,
1067 .write = dtf_write_channel,
1068 .open = simple_open,
1069 .llseek = default_llseek,
1070 };
1071
1072 static ssize_t dtf_read_device(struct file *file, char __user *buf,
1073 size_t count, loff_t *ppos)
1074 {
1075 struct dmatest_info *info = file->private_data;
1076 return simple_read_from_buffer(buf, count, ppos,
1077 info->dbgfs_params.device,
1078 strlen(info->dbgfs_params.device));
1079 }
1080
1081 static ssize_t dtf_write_device(struct file *file, const char __user *buf,
1082 size_t size, loff_t *ppos)
1083 {
1084 struct dmatest_info *info = file->private_data;
1085 return dtf_write_string(info->dbgfs_params.device,
1086 sizeof(info->dbgfs_params.device),
1087 ppos, buf, size);
1088 }
1089
1090 static const struct file_operations dtf_device_fops = {
1091 .read = dtf_read_device,
1092 .write = dtf_write_device,
1093 .open = simple_open,
1094 .llseek = default_llseek,
1095 };
1096
1097 static ssize_t dtf_read_run(struct file *file, char __user *user_buf,
1098 size_t count, loff_t *ppos)
1099 {
1100 struct dmatest_info *info = file->private_data;
1101 char buf[3];
1102
1103 mutex_lock(&info->lock);
1104
1105 if (__is_threaded_test_run(info)) {
1106 buf[0] = 'Y';
1107 } else {
1108 __stop_threaded_test(info);
1109 buf[0] = 'N';
1110 }
1111
1112 mutex_unlock(&info->lock);
1113 buf[1] = '\n';
1114 buf[2] = 0x00;
1115 return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
1116 }
1117
1118 static ssize_t dtf_write_run(struct file *file, const char __user *user_buf,
1119 size_t count, loff_t *ppos)
1120 {
1121 struct dmatest_info *info = file->private_data;
1122 char buf[16];
1123 bool bv;
1124 int ret = 0;
1125
1126 if (copy_from_user(buf, user_buf, min(count, (sizeof(buf) - 1))))
1127 return -EFAULT;
1128
1129 if (strtobool(buf, &bv) == 0) {
1130 mutex_lock(&info->lock);
1131
1132 if (__is_threaded_test_run(info))
1133 ret = -EBUSY;
1134 else
1135 ret = __restart_threaded_test(info, bv);
1136
1137 mutex_unlock(&info->lock);
1138 }
1139
1140 return ret ? ret : count;
1141 }
1142
1143 static const struct file_operations dtf_run_fops = {
1144 .read = dtf_read_run,
1145 .write = dtf_write_run,
1146 .open = simple_open,
1147 .llseek = default_llseek,
1148 };
1149
1150 static int dtf_results_show(struct seq_file *sf, void *data)
1151 {
1152 struct dmatest_info *info = sf->private;
1153 struct dmatest_result *result;
1154 struct dmatest_thread_result *tr;
1155 unsigned int i;
1156
1157 mutex_lock(&info->results_lock);
1158 list_for_each_entry(result, &info->results, node) {
1159 list_for_each_entry(tr, &result->results, node) {
1160 seq_printf(sf, "%s\n",
1161 thread_result_get(result->name, tr));
1162 if (tr->type == DMATEST_ET_VERIFY_BUF) {
1163 for (i = 0; i < tr->vr->error_count; i++) {
1164 seq_printf(sf, "\t%s\n",
1165 verify_result_get_one(tr->vr, i));
1166 }
1167 }
1168 }
1169 }
1170
1171 mutex_unlock(&info->results_lock);
1172 return 0;
1173 }
1174
1175 static int dtf_results_open(struct inode *inode, struct file *file)
1176 {
1177 return single_open(file, dtf_results_show, inode->i_private);
1178 }
1179
1180 static const struct file_operations dtf_results_fops = {
1181 .open = dtf_results_open,
1182 .read = seq_read,
1183 .llseek = seq_lseek,
1184 .release = single_release,
1185 };
1186
1187 static int dmatest_register_dbgfs(struct dmatest_info *info)
1188 {
1189 struct dentry *d;
1190 struct dmatest_params *params = &info->dbgfs_params;
1191 int ret = -ENOMEM;
1192
1193 d = debugfs_create_dir("dmatest", NULL);
1194 if (IS_ERR(d))
1195 return PTR_ERR(d);
1196 if (!d)
1197 goto err_root;
1198
1199 info->root = d;
1200
1201 /* Copy initial values */
1202 memcpy(params, &info->params, sizeof(*params));
1203
1204 /* Test parameters */
1205
1206 d = debugfs_create_u32("test_buf_size", S_IWUSR | S_IRUGO, info->root,
1207 (u32 *)&params->buf_size);
1208 if (IS_ERR_OR_NULL(d))
1209 goto err_node;
1210
1211 d = debugfs_create_file("channel", S_IRUGO | S_IWUSR, info->root,
1212 info, &dtf_channel_fops);
1213 if (IS_ERR_OR_NULL(d))
1214 goto err_node;
1215
1216 d = debugfs_create_file("device", S_IRUGO | S_IWUSR, info->root,
1217 info, &dtf_device_fops);
1218 if (IS_ERR_OR_NULL(d))
1219 goto err_node;
1220
1221 d = debugfs_create_u32("threads_per_chan", S_IWUSR | S_IRUGO, info->root,
1222 (u32 *)&params->threads_per_chan);
1223 if (IS_ERR_OR_NULL(d))
1224 goto err_node;
1225
1226 d = debugfs_create_u32("max_channels", S_IWUSR | S_IRUGO, info->root,
1227 (u32 *)&params->max_channels);
1228 if (IS_ERR_OR_NULL(d))
1229 goto err_node;
1230
1231 d = debugfs_create_u32("iterations", S_IWUSR | S_IRUGO, info->root,
1232 (u32 *)&params->iterations);
1233 if (IS_ERR_OR_NULL(d))
1234 goto err_node;
1235
1236 d = debugfs_create_u32("xor_sources", S_IWUSR | S_IRUGO, info->root,
1237 (u32 *)&params->xor_sources);
1238 if (IS_ERR_OR_NULL(d))
1239 goto err_node;
1240
1241 d = debugfs_create_u32("pq_sources", S_IWUSR | S_IRUGO, info->root,
1242 (u32 *)&params->pq_sources);
1243 if (IS_ERR_OR_NULL(d))
1244 goto err_node;
1245
1246 d = debugfs_create_u32("timeout", S_IWUSR | S_IRUGO, info->root,
1247 (u32 *)&params->timeout);
1248 if (IS_ERR_OR_NULL(d))
1249 goto err_node;
1250
1251 /* Run or stop threaded test */
1252 d = debugfs_create_file("run", S_IWUSR | S_IRUGO, info->root,
1253 info, &dtf_run_fops);
1254 if (IS_ERR_OR_NULL(d))
1255 goto err_node;
1256
1257 /* Results of test in progress */
1258 d = debugfs_create_file("results", S_IRUGO, info->root, info,
1259 &dtf_results_fops);
1260 if (IS_ERR_OR_NULL(d))
1261 goto err_node;
1262
1263 return 0;
1264
1265 err_node:
1266 debugfs_remove_recursive(info->root);
1267 err_root:
1268 pr_err("dmatest: Failed to initialize debugfs\n");
1269 return ret;
1270 }
1271
1272 static int __init dmatest_init(void)
1273 {
1274 struct dmatest_info *info = &test_info;
1275 struct dmatest_params *params = &info->params;
1276 int ret;
1277
1278 memset(info, 0, sizeof(*info));
1279
1280 mutex_init(&info->lock);
1281 INIT_LIST_HEAD(&info->channels);
1282
1283 mutex_init(&info->results_lock);
1284 INIT_LIST_HEAD(&info->results);
1285
1286 /* Set default parameters */
1287 params->buf_size = test_buf_size;
1288 strlcpy(params->channel, test_channel, sizeof(params->channel));
1289 strlcpy(params->device, test_device, sizeof(params->device));
1290 params->threads_per_chan = threads_per_chan;
1291 params->max_channels = max_channels;
1292 params->iterations = iterations;
1293 params->xor_sources = xor_sources;
1294 params->pq_sources = pq_sources;
1295 params->timeout = timeout;
1296
1297 ret = dmatest_register_dbgfs(info);
1298 if (ret)
1299 return ret;
1300
1301 #ifdef MODULE
1302 return 0;
1303 #else
1304 return run_threaded_test(info);
1305 #endif
1306 }
1307 /* when compiled-in wait for drivers to load first */
1308 late_initcall(dmatest_init);
1309
1310 static void __exit dmatest_exit(void)
1311 {
1312 struct dmatest_info *info = &test_info;
1313
1314 debugfs_remove_recursive(info->root);
1315 stop_threaded_test(info);
1316 result_free(info, NULL);
1317 }
1318 module_exit(dmatest_exit);
1319
1320 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1321 MODULE_LICENSE("GPL v2");
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