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Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / dma / dmatest.c
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,
720 done.done || kthread_should_stop(),
721 msecs_to_jiffies(params->timeout));
722
723 status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
724
725 if (!done.done) {
726 /*
727 * We're leaving the timed out dma operation with
728 * dangling pointer to done_wait. To make this
729 * correct, we'll need to allocate wait_done for
730 * each test iteration and perform "who's gonna
731 * free it this time?" dancing. For now, just
732 * leave it dangling.
733 */
734 thread_result_add(info, result, DMATEST_ET_TIMEOUT,
735 total_tests, src_off, dst_off,
736 len, 0);
737 failed_tests++;
738 continue;
739 } else if (status != DMA_SUCCESS) {
740 enum dmatest_error_type type = (status == DMA_ERROR) ?
741 DMATEST_ET_DMA_ERROR : DMATEST_ET_DMA_IN_PROGRESS;
742 thread_result_add(info, result, type,
743 total_tests, src_off, dst_off,
744 len, status);
745 failed_tests++;
746 continue;
747 }
748
749 /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
750 unmap_dst(dev->dev, dma_dsts, params->buf_size, dst_cnt);
751
752 error_count = 0;
753
754 pr_debug("%s: verifying source buffer...\n", thread_name);
755 error_count += verify_result_add(info, result, total_tests,
756 src_off, dst_off, len, thread->srcs, -1,
757 0, PATTERN_SRC, true);
758 error_count += verify_result_add(info, result, total_tests,
759 src_off, dst_off, len, thread->srcs, 0,
760 src_off, PATTERN_SRC | PATTERN_COPY, true);
761 error_count += verify_result_add(info, result, total_tests,
762 src_off, dst_off, len, thread->srcs, 1,
763 src_off + len, PATTERN_SRC, true);
764
765 pr_debug("%s: verifying dest buffer...\n", thread_name);
766 error_count += verify_result_add(info, result, total_tests,
767 src_off, dst_off, len, thread->dsts, -1,
768 0, PATTERN_DST, false);
769 error_count += verify_result_add(info, result, total_tests,
770 src_off, dst_off, len, thread->dsts, 0,
771 src_off, PATTERN_SRC | PATTERN_COPY, false);
772 error_count += verify_result_add(info, result, total_tests,
773 src_off, dst_off, len, thread->dsts, 1,
774 dst_off + len, PATTERN_DST, false);
775
776 if (error_count) {
777 thread_result_add(info, result, DMATEST_ET_VERIFY,
778 total_tests, src_off, dst_off,
779 len, error_count);
780 failed_tests++;
781 } else {
782 thread_result_add(info, result, DMATEST_ET_OK,
783 total_tests, src_off, dst_off,
784 len, 0);
785 }
786 }
787
788 ret = 0;
789 for (i = 0; thread->dsts[i]; i++)
790 kfree(thread->dsts[i]);
791 err_dstbuf:
792 kfree(thread->dsts);
793 err_dsts:
794 for (i = 0; thread->srcs[i]; i++)
795 kfree(thread->srcs[i]);
796 err_srcbuf:
797 kfree(thread->srcs);
798 err_srcs:
799 kfree(pq_coefs);
800 err_thread_type:
801 pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
802 thread_name, total_tests, failed_tests, ret);
803
804 /* terminate all transfers on specified channels */
805 if (ret)
806 dmaengine_terminate_all(chan);
807
808 thread->done = true;
809
810 if (params->iterations > 0)
811 while (!kthread_should_stop()) {
812 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit);
813 interruptible_sleep_on(&wait_dmatest_exit);
814 }
815
816 return ret;
817 }
818
819 static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
820 {
821 struct dmatest_thread *thread;
822 struct dmatest_thread *_thread;
823 int ret;
824
825 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
826 ret = kthread_stop(thread->task);
827 pr_debug("dmatest: thread %s exited with status %d\n",
828 thread->task->comm, ret);
829 list_del(&thread->node);
830 kfree(thread);
831 }
832
833 /* terminate all transfers on specified channels */
834 dmaengine_terminate_all(dtc->chan);
835
836 kfree(dtc);
837 }
838
839 static int dmatest_add_threads(struct dmatest_info *info,
840 struct dmatest_chan *dtc, enum dma_transaction_type type)
841 {
842 struct dmatest_params *params = &info->params;
843 struct dmatest_thread *thread;
844 struct dma_chan *chan = dtc->chan;
845 char *op;
846 unsigned int i;
847
848 if (type == DMA_MEMCPY)
849 op = "copy";
850 else if (type == DMA_XOR)
851 op = "xor";
852 else if (type == DMA_PQ)
853 op = "pq";
854 else
855 return -EINVAL;
856
857 for (i = 0; i < params->threads_per_chan; i++) {
858 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
859 if (!thread) {
860 pr_warning("dmatest: No memory for %s-%s%u\n",
861 dma_chan_name(chan), op, i);
862
863 break;
864 }
865 thread->info = info;
866 thread->chan = dtc->chan;
867 thread->type = type;
868 smp_wmb();
869 thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
870 dma_chan_name(chan), op, i);
871 if (IS_ERR(thread->task)) {
872 pr_warning("dmatest: Failed to run thread %s-%s%u\n",
873 dma_chan_name(chan), op, i);
874 kfree(thread);
875 break;
876 }
877
878 /* srcbuf and dstbuf are allocated by the thread itself */
879
880 list_add_tail(&thread->node, &dtc->threads);
881 }
882
883 return i;
884 }
885
886 static int dmatest_add_channel(struct dmatest_info *info,
887 struct dma_chan *chan)
888 {
889 struct dmatest_chan *dtc;
890 struct dma_device *dma_dev = chan->device;
891 unsigned int thread_count = 0;
892 int cnt;
893
894 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
895 if (!dtc) {
896 pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
897 return -ENOMEM;
898 }
899
900 dtc->chan = chan;
901 INIT_LIST_HEAD(&dtc->threads);
902
903 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
904 cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
905 thread_count += cnt > 0 ? cnt : 0;
906 }
907 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
908 cnt = dmatest_add_threads(info, dtc, DMA_XOR);
909 thread_count += cnt > 0 ? cnt : 0;
910 }
911 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
912 cnt = dmatest_add_threads(info, dtc, DMA_PQ);
913 thread_count += cnt > 0 ? cnt : 0;
914 }
915
916 pr_info("dmatest: Started %u threads using %s\n",
917 thread_count, dma_chan_name(chan));
918
919 list_add_tail(&dtc->node, &info->channels);
920 info->nr_channels++;
921
922 return 0;
923 }
924
925 static bool filter(struct dma_chan *chan, void *param)
926 {
927 struct dmatest_params *params = param;
928
929 if (!dmatest_match_channel(params, chan) ||
930 !dmatest_match_device(params, chan->device))
931 return false;
932 else
933 return true;
934 }
935
936 static int __run_threaded_test(struct dmatest_info *info)
937 {
938 dma_cap_mask_t mask;
939 struct dma_chan *chan;
940 struct dmatest_params *params = &info->params;
941 int err = 0;
942
943 dma_cap_zero(mask);
944 dma_cap_set(DMA_MEMCPY, mask);
945 for (;;) {
946 chan = dma_request_channel(mask, filter, params);
947 if (chan) {
948 err = dmatest_add_channel(info, chan);
949 if (err) {
950 dma_release_channel(chan);
951 break; /* add_channel failed, punt */
952 }
953 } else
954 break; /* no more channels available */
955 if (params->max_channels &&
956 info->nr_channels >= params->max_channels)
957 break; /* we have all we need */
958 }
959 return err;
960 }
961
962 #ifndef MODULE
963 static int run_threaded_test(struct dmatest_info *info)
964 {
965 int ret;
966
967 mutex_lock(&info->lock);
968 ret = __run_threaded_test(info);
969 mutex_unlock(&info->lock);
970 return ret;
971 }
972 #endif
973
974 static void __stop_threaded_test(struct dmatest_info *info)
975 {
976 struct dmatest_chan *dtc, *_dtc;
977 struct dma_chan *chan;
978
979 list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
980 list_del(&dtc->node);
981 chan = dtc->chan;
982 dmatest_cleanup_channel(dtc);
983 pr_debug("dmatest: dropped channel %s\n", dma_chan_name(chan));
984 dma_release_channel(chan);
985 }
986
987 info->nr_channels = 0;
988 }
989
990 static void stop_threaded_test(struct dmatest_info *info)
991 {
992 mutex_lock(&info->lock);
993 __stop_threaded_test(info);
994 mutex_unlock(&info->lock);
995 }
996
997 static int __restart_threaded_test(struct dmatest_info *info, bool run)
998 {
999 struct dmatest_params *params = &info->params;
1000 int ret;
1001
1002 /* Stop any running test first */
1003 __stop_threaded_test(info);
1004
1005 if (run == false)
1006 return 0;
1007
1008 /* Clear results from previous run */
1009 result_free(info, NULL);
1010
1011 /* Copy test parameters */
1012 memcpy(params, &info->dbgfs_params, sizeof(*params));
1013
1014 /* Run test with new parameters */
1015 ret = __run_threaded_test(info);
1016 if (ret) {
1017 __stop_threaded_test(info);
1018 pr_err("dmatest: Can't run test\n");
1019 }
1020
1021 return ret;
1022 }
1023
1024 static ssize_t dtf_write_string(void *to, size_t available, loff_t *ppos,
1025 const void __user *from, size_t count)
1026 {
1027 char tmp[20];
1028 ssize_t len;
1029
1030 len = simple_write_to_buffer(tmp, sizeof(tmp) - 1, ppos, from, count);
1031 if (len >= 0) {
1032 tmp[len] = '\0';
1033 strlcpy(to, strim(tmp), available);
1034 }
1035
1036 return len;
1037 }
1038
1039 static ssize_t dtf_read_channel(struct file *file, char __user *buf,
1040 size_t count, loff_t *ppos)
1041 {
1042 struct dmatest_info *info = file->private_data;
1043 return simple_read_from_buffer(buf, count, ppos,
1044 info->dbgfs_params.channel,
1045 strlen(info->dbgfs_params.channel));
1046 }
1047
1048 static ssize_t dtf_write_channel(struct file *file, const char __user *buf,
1049 size_t size, loff_t *ppos)
1050 {
1051 struct dmatest_info *info = file->private_data;
1052 return dtf_write_string(info->dbgfs_params.channel,
1053 sizeof(info->dbgfs_params.channel),
1054 ppos, buf, size);
1055 }
1056
1057 static const struct file_operations dtf_channel_fops = {
1058 .read = dtf_read_channel,
1059 .write = dtf_write_channel,
1060 .open = simple_open,
1061 .llseek = default_llseek,
1062 };
1063
1064 static ssize_t dtf_read_device(struct file *file, char __user *buf,
1065 size_t count, loff_t *ppos)
1066 {
1067 struct dmatest_info *info = file->private_data;
1068 return simple_read_from_buffer(buf, count, ppos,
1069 info->dbgfs_params.device,
1070 strlen(info->dbgfs_params.device));
1071 }
1072
1073 static ssize_t dtf_write_device(struct file *file, const char __user *buf,
1074 size_t size, loff_t *ppos)
1075 {
1076 struct dmatest_info *info = file->private_data;
1077 return dtf_write_string(info->dbgfs_params.device,
1078 sizeof(info->dbgfs_params.device),
1079 ppos, buf, size);
1080 }
1081
1082 static const struct file_operations dtf_device_fops = {
1083 .read = dtf_read_device,
1084 .write = dtf_write_device,
1085 .open = simple_open,
1086 .llseek = default_llseek,
1087 };
1088
1089 static ssize_t dtf_read_run(struct file *file, char __user *user_buf,
1090 size_t count, loff_t *ppos)
1091 {
1092 struct dmatest_info *info = file->private_data;
1093 char buf[3];
1094 struct dmatest_chan *dtc;
1095 bool alive = false;
1096
1097 mutex_lock(&info->lock);
1098 list_for_each_entry(dtc, &info->channels, node) {
1099 struct dmatest_thread *thread;
1100
1101 list_for_each_entry(thread, &dtc->threads, node) {
1102 if (!thread->done) {
1103 alive = true;
1104 break;
1105 }
1106 }
1107 }
1108
1109 if (alive) {
1110 buf[0] = 'Y';
1111 } else {
1112 __stop_threaded_test(info);
1113 buf[0] = 'N';
1114 }
1115
1116 mutex_unlock(&info->lock);
1117 buf[1] = '\n';
1118 buf[2] = 0x00;
1119 return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
1120 }
1121
1122 static ssize_t dtf_write_run(struct file *file, const char __user *user_buf,
1123 size_t count, loff_t *ppos)
1124 {
1125 struct dmatest_info *info = file->private_data;
1126 char buf[16];
1127 bool bv;
1128 int ret = 0;
1129
1130 if (copy_from_user(buf, user_buf, min(count, (sizeof(buf) - 1))))
1131 return -EFAULT;
1132
1133 if (strtobool(buf, &bv) == 0) {
1134 mutex_lock(&info->lock);
1135 ret = __restart_threaded_test(info, bv);
1136 mutex_unlock(&info->lock);
1137 }
1138
1139 return ret ? ret : count;
1140 }
1141
1142 static const struct file_operations dtf_run_fops = {
1143 .read = dtf_read_run,
1144 .write = dtf_write_run,
1145 .open = simple_open,
1146 .llseek = default_llseek,
1147 };
1148
1149 static int dtf_results_show(struct seq_file *sf, void *data)
1150 {
1151 struct dmatest_info *info = sf->private;
1152 struct dmatest_result *result;
1153 struct dmatest_thread_result *tr;
1154 unsigned int i;
1155
1156 mutex_lock(&info->results_lock);
1157 list_for_each_entry(result, &info->results, node) {
1158 list_for_each_entry(tr, &result->results, node) {
1159 seq_printf(sf, "%s\n",
1160 thread_result_get(result->name, tr));
1161 if (tr->type == DMATEST_ET_VERIFY_BUF) {
1162 for (i = 0; i < tr->vr->error_count; i++) {
1163 seq_printf(sf, "\t%s\n",
1164 verify_result_get_one(tr->vr, i));
1165 }
1166 }
1167 }
1168 }
1169
1170 mutex_unlock(&info->results_lock);
1171 return 0;
1172 }
1173
1174 static int dtf_results_open(struct inode *inode, struct file *file)
1175 {
1176 return single_open(file, dtf_results_show, inode->i_private);
1177 }
1178
1179 static const struct file_operations dtf_results_fops = {
1180 .open = dtf_results_open,
1181 .read = seq_read,
1182 .llseek = seq_lseek,
1183 .release = single_release,
1184 };
1185
1186 static int dmatest_register_dbgfs(struct dmatest_info *info)
1187 {
1188 struct dentry *d;
1189 struct dmatest_params *params = &info->dbgfs_params;
1190 int ret = -ENOMEM;
1191
1192 d = debugfs_create_dir("dmatest", NULL);
1193 if (IS_ERR(d))
1194 return PTR_ERR(d);
1195 if (!d)
1196 goto err_root;
1197
1198 info->root = d;
1199
1200 /* Copy initial values */
1201 memcpy(params, &info->params, sizeof(*params));
1202
1203 /* Test parameters */
1204
1205 d = debugfs_create_u32("test_buf_size", S_IWUSR | S_IRUGO, info->root,
1206 (u32 *)&params->buf_size);
1207 if (IS_ERR_OR_NULL(d))
1208 goto err_node;
1209
1210 d = debugfs_create_file("channel", S_IRUGO | S_IWUSR, info->root,
1211 info, &dtf_channel_fops);
1212 if (IS_ERR_OR_NULL(d))
1213 goto err_node;
1214
1215 d = debugfs_create_file("device", S_IRUGO | S_IWUSR, info->root,
1216 info, &dtf_device_fops);
1217 if (IS_ERR_OR_NULL(d))
1218 goto err_node;
1219
1220 d = debugfs_create_u32("threads_per_chan", S_IWUSR | S_IRUGO, info->root,
1221 (u32 *)&params->threads_per_chan);
1222 if (IS_ERR_OR_NULL(d))
1223 goto err_node;
1224
1225 d = debugfs_create_u32("max_channels", S_IWUSR | S_IRUGO, info->root,
1226 (u32 *)&params->max_channels);
1227 if (IS_ERR_OR_NULL(d))
1228 goto err_node;
1229
1230 d = debugfs_create_u32("iterations", S_IWUSR | S_IRUGO, info->root,
1231 (u32 *)&params->iterations);
1232 if (IS_ERR_OR_NULL(d))
1233 goto err_node;
1234
1235 d = debugfs_create_u32("xor_sources", S_IWUSR | S_IRUGO, info->root,
1236 (u32 *)&params->xor_sources);
1237 if (IS_ERR_OR_NULL(d))
1238 goto err_node;
1239
1240 d = debugfs_create_u32("pq_sources", S_IWUSR | S_IRUGO, info->root,
1241 (u32 *)&params->pq_sources);
1242 if (IS_ERR_OR_NULL(d))
1243 goto err_node;
1244
1245 d = debugfs_create_u32("timeout", S_IWUSR | S_IRUGO, info->root,
1246 (u32 *)&params->timeout);
1247 if (IS_ERR_OR_NULL(d))
1248 goto err_node;
1249
1250 /* Run or stop threaded test */
1251 d = debugfs_create_file("run", S_IWUSR | S_IRUGO, info->root,
1252 info, &dtf_run_fops);
1253 if (IS_ERR_OR_NULL(d))
1254 goto err_node;
1255
1256 /* Results of test in progress */
1257 d = debugfs_create_file("results", S_IRUGO, info->root, info,
1258 &dtf_results_fops);
1259 if (IS_ERR_OR_NULL(d))
1260 goto err_node;
1261
1262 return 0;
1263
1264 err_node:
1265 debugfs_remove_recursive(info->root);
1266 err_root:
1267 pr_err("dmatest: Failed to initialize debugfs\n");
1268 return ret;
1269 }
1270
1271 static int __init dmatest_init(void)
1272 {
1273 struct dmatest_info *info = &test_info;
1274 struct dmatest_params *params = &info->params;
1275 int ret;
1276
1277 memset(info, 0, sizeof(*info));
1278
1279 mutex_init(&info->lock);
1280 INIT_LIST_HEAD(&info->channels);
1281
1282 mutex_init(&info->results_lock);
1283 INIT_LIST_HEAD(&info->results);
1284
1285 /* Set default parameters */
1286 params->buf_size = test_buf_size;
1287 strlcpy(params->channel, test_channel, sizeof(params->channel));
1288 strlcpy(params->device, test_device, sizeof(params->device));
1289 params->threads_per_chan = threads_per_chan;
1290 params->max_channels = max_channels;
1291 params->iterations = iterations;
1292 params->xor_sources = xor_sources;
1293 params->pq_sources = pq_sources;
1294 params->timeout = timeout;
1295
1296 ret = dmatest_register_dbgfs(info);
1297 if (ret)
1298 return ret;
1299
1300 #ifdef MODULE
1301 return 0;
1302 #else
1303 return run_threaded_test(info);
1304 #endif
1305 }
1306 /* when compiled-in wait for drivers to load first */
1307 late_initcall(dmatest_init);
1308
1309 static void __exit dmatest_exit(void)
1310 {
1311 struct dmatest_info *info = &test_info;
1312
1313 debugfs_remove_recursive(info->root);
1314 stop_threaded_test(info);
1315 result_free(info, NULL);
1316 }
1317 module_exit(dmatest_exit);
1318
1319 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1320 MODULE_LICENSE("GPL v2");
kernel source for telekom puls (alcatel/mediatek)