?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
dma: imx-sdma: Fix warnings for LPAE builds
[linux-2.6.git] / drivers / dma / dmatest.c
blob59e287f56dfca28bb0ff40fc79b6c0e612af58ac
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 | S_IWUSR);
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),
33 S_IRUGO | S_IWUSR);
34 MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
35
36 static char test_device[20];
37 module_param_string(device, test_device, sizeof(test_device),
38 S_IRUGO | S_IWUSR);
39 MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
40
41 static unsigned int threads_per_chan = 1;
42 module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR);
43 MODULE_PARM_DESC(threads_per_chan,
44 "Number of threads to start per channel (default: 1)");
45
46 static unsigned int max_channels;
47 module_param(max_channels, uint, S_IRUGO | S_IWUSR);
48 MODULE_PARM_DESC(max_channels,
49 "Maximum number of channels to use (default: all)");
50
51 static unsigned int iterations;
52 module_param(iterations, uint, S_IRUGO | S_IWUSR);
53 MODULE_PARM_DESC(iterations,
54 "Iterations before stopping test (default: infinite)");
55
56 static unsigned int xor_sources = 3;
57 module_param(xor_sources, uint, S_IRUGO | S_IWUSR);
58 MODULE_PARM_DESC(xor_sources,
59 "Number of xor source buffers (default: 3)");
60
61 static unsigned int pq_sources = 3;
62 module_param(pq_sources, uint, S_IRUGO | S_IWUSR);
63 MODULE_PARM_DESC(pq_sources,
64 "Number of p+q source buffers (default: 3)");
65
66 static int timeout = 3000;
67 module_param(timeout, uint, S_IRUGO | S_IWUSR);
68 MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
69 "Pass -1 for infinite timeout");
70
71 /* Maximum amount of mismatched bytes in buffer to print */
72 #define MAX_ERROR_COUNT 32
73
74 /*
75 * Initialization patterns. All bytes in the source buffer has bit 7
76 * set, all bytes in the destination buffer has bit 7 cleared.
77 *
78 * Bit 6 is set for all bytes which are to be copied by the DMA
79 * engine. Bit 5 is set for all bytes which are to be overwritten by
80 * the DMA engine.
81 *
82 * The remaining bits are the inverse of a counter which increments by
83 * one for each byte address.
84 */
85 #define PATTERN_SRC 0x80
86 #define PATTERN_DST 0x00
87 #define PATTERN_COPY 0x40
88 #define PATTERN_OVERWRITE 0x20
89 #define PATTERN_COUNT_MASK 0x1f
90
91 enum dmatest_error_type {
92 DMATEST_ET_OK,
93 DMATEST_ET_MAP_SRC,
94 DMATEST_ET_MAP_DST,
95 DMATEST_ET_PREP,
96 DMATEST_ET_SUBMIT,
97 DMATEST_ET_TIMEOUT,
98 DMATEST_ET_DMA_ERROR,
99 DMATEST_ET_DMA_IN_PROGRESS,
100 DMATEST_ET_VERIFY,
101 DMATEST_ET_VERIFY_BUF,
102 };
103
104 struct dmatest_verify_buffer {
105 unsigned int index;
106 u8 expected;
107 u8 actual;
108 };
109
110 struct dmatest_verify_result {
111 unsigned int error_count;
112 struct dmatest_verify_buffer data[MAX_ERROR_COUNT];
113 u8 pattern;
114 bool is_srcbuf;
115 };
116
117 struct dmatest_thread_result {
118 struct list_head node;
119 unsigned int n;
120 unsigned int src_off;
121 unsigned int dst_off;
122 unsigned int len;
123 enum dmatest_error_type type;
124 union {
125 unsigned long data;
126 dma_cookie_t cookie;
127 enum dma_status status;
128 int error;
129 struct dmatest_verify_result *vr;
130 };
131 };
132
133 struct dmatest_result {
134 struct list_head node;
135 char *name;
136 struct list_head results;
137 };
138
139 struct dmatest_info;
140
141 struct dmatest_thread {
142 struct list_head node;
143 struct dmatest_info *info;
144 struct task_struct *task;
145 struct dma_chan *chan;
146 u8 **srcs;
147 u8 **dsts;
148 enum dma_transaction_type type;
149 bool done;
150 };
151
152 struct dmatest_chan {
153 struct list_head node;
154 struct dma_chan *chan;
155 struct list_head threads;
156 };
157
158 /**
159 * struct dmatest_params - test parameters.
160 * @buf_size: size of the memcpy test buffer
161 * @channel: bus ID of the channel to test
162 * @device: bus ID of the DMA Engine to test
163 * @threads_per_chan: number of threads to start per channel
164 * @max_channels: maximum number of channels to use
165 * @iterations: iterations before stopping test
166 * @xor_sources: number of xor source buffers
167 * @pq_sources: number of p+q source buffers
168 * @timeout: transfer timeout in msec, -1 for infinite timeout
169 */
170 struct dmatest_params {
171 unsigned int buf_size;
172 char channel[20];
173 char device[20];
174 unsigned int threads_per_chan;
175 unsigned int max_channels;
176 unsigned int iterations;
177 unsigned int xor_sources;
178 unsigned int pq_sources;
179 int timeout;
180 };
181
182 /**
183 * struct dmatest_info - test information.
184 * @params: test parameters
185 * @lock: access protection to the fields of this structure
186 */
187 struct dmatest_info {
188 /* Test parameters */
189 struct dmatest_params params;
190
191 /* Internal state */
192 struct list_head channels;
193 unsigned int nr_channels;
194 struct mutex lock;
195
196 /* debugfs related stuff */
197 struct dentry *root;
198
199 /* Test results */
200 struct list_head results;
201 struct mutex results_lock;
202 };
203
204 static struct dmatest_info test_info;
205
206 static bool dmatest_match_channel(struct dmatest_params *params,
207 struct dma_chan *chan)
208 {
209 if (params->channel[0] == '\0')
210 return true;
211 return strcmp(dma_chan_name(chan), params->channel) == 0;
212 }
213
214 static bool dmatest_match_device(struct dmatest_params *params,
215 struct dma_device *device)
216 {
217 if (params->device[0] == '\0')
218 return true;
219 return strcmp(dev_name(device->dev), params->device) == 0;
220 }
221
222 static unsigned long dmatest_random(void)
223 {
224 unsigned long buf;
225
226 get_random_bytes(&buf, sizeof(buf));
227 return buf;
228 }
229
230 static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
231 unsigned int buf_size)
232 {
233 unsigned int i;
234 u8 *buf;
235
236 for (; (buf = *bufs); bufs++) {
237 for (i = 0; i < start; i++)
238 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
239 for ( ; i < start + len; i++)
240 buf[i] = PATTERN_SRC | PATTERN_COPY
241 | (~i & PATTERN_COUNT_MASK);
242 for ( ; i < buf_size; i++)
243 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
244 buf++;
245 }
246 }
247
248 static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
249 unsigned int buf_size)
250 {
251 unsigned int i;
252 u8 *buf;
253
254 for (; (buf = *bufs); bufs++) {
255 for (i = 0; i < start; i++)
256 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
257 for ( ; i < start + len; i++)
258 buf[i] = PATTERN_DST | PATTERN_OVERWRITE
259 | (~i & PATTERN_COUNT_MASK);
260 for ( ; i < buf_size; i++)
261 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
262 }
263 }
264
265 static unsigned int dmatest_verify(struct dmatest_verify_result *vr, u8 **bufs,
266 unsigned int start, unsigned int end, unsigned int counter,
267 u8 pattern, bool is_srcbuf)
268 {
269 unsigned int i;
270 unsigned int error_count = 0;
271 u8 actual;
272 u8 expected;
273 u8 *buf;
274 unsigned int counter_orig = counter;
275 struct dmatest_verify_buffer *vb;
276
277 for (; (buf = *bufs); bufs++) {
278 counter = counter_orig;
279 for (i = start; i < end; i++) {
280 actual = buf[i];
281 expected = pattern | (~counter & PATTERN_COUNT_MASK);
282 if (actual != expected) {
283 if (error_count < MAX_ERROR_COUNT && vr) {
284 vb = &vr->data[error_count];
285 vb->index = i;
286 vb->expected = expected;
287 vb->actual = actual;
288 }
289 error_count++;
290 }
291 counter++;
292 }
293 }
294
295 if (error_count > MAX_ERROR_COUNT)
296 pr_warning("%s: %u errors suppressed\n",
297 current->comm, error_count - MAX_ERROR_COUNT);
298
299 return error_count;
300 }
301
302 /* poor man's completion - we want to use wait_event_freezable() on it */
303 struct dmatest_done {
304 bool done;
305 wait_queue_head_t *wait;
306 };
307
308 static void dmatest_callback(void *arg)
309 {
310 struct dmatest_done *done = arg;
311
312 done->done = true;
313 wake_up_all(done->wait);
314 }
315
316 static inline void unmap_src(struct device *dev, dma_addr_t *addr, size_t len,
317 unsigned int count)
318 {
319 while (count--)
320 dma_unmap_single(dev, addr[count], len, DMA_TO_DEVICE);
321 }
322
323 static inline void unmap_dst(struct device *dev, dma_addr_t *addr, size_t len,
324 unsigned int count)
325 {
326 while (count--)
327 dma_unmap_single(dev, addr[count], len, DMA_BIDIRECTIONAL);
328 }
329
330 static unsigned int min_odd(unsigned int x, unsigned int y)
331 {
332 unsigned int val = min(x, y);
333
334 return val % 2 ? val : val - 1;
335 }
336
337 static char *verify_result_get_one(struct dmatest_verify_result *vr,
338 unsigned int i)
339 {
340 struct dmatest_verify_buffer *vb = &vr->data[i];
341 u8 diff = vb->actual ^ vr->pattern;
342 static char buf[512];
343 char *msg;
344
345 if (vr->is_srcbuf)
346 msg = "srcbuf overwritten!";
347 else if ((vr->pattern & PATTERN_COPY)
348 && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
349 msg = "dstbuf not copied!";
350 else if (diff & PATTERN_SRC)
351 msg = "dstbuf was copied!";
352 else
353 msg = "dstbuf mismatch!";
354
355 snprintf(buf, sizeof(buf) - 1, "%s [0x%x] Expected %02x, got %02x", msg,
356 vb->index, vb->expected, vb->actual);
357
358 return buf;
359 }
360
361 static char *thread_result_get(const char *name,
362 struct dmatest_thread_result *tr)
363 {
364 static const char * const messages[] = {
365 [DMATEST_ET_OK] = "No errors",
366 [DMATEST_ET_MAP_SRC] = "src mapping error",
367 [DMATEST_ET_MAP_DST] = "dst mapping error",
368 [DMATEST_ET_PREP] = "prep error",
369 [DMATEST_ET_SUBMIT] = "submit error",
370 [DMATEST_ET_TIMEOUT] = "test timed out",
371 [DMATEST_ET_DMA_ERROR] =
372 "got completion callback (DMA_ERROR)",
373 [DMATEST_ET_DMA_IN_PROGRESS] =
374 "got completion callback (DMA_IN_PROGRESS)",
375 [DMATEST_ET_VERIFY] = "errors",
376 [DMATEST_ET_VERIFY_BUF] = "verify errors",
377 };
378 static char buf[512];
379
380 snprintf(buf, sizeof(buf) - 1,
381 "%s: #%u: %s with src_off=0x%x ""dst_off=0x%x len=0x%x (%lu)",
382 name, tr->n, messages[tr->type], tr->src_off, tr->dst_off,
383 tr->len, tr->data);
384
385 return buf;
386 }
387
388 static int thread_result_add(struct dmatest_info *info,
389 struct dmatest_result *r, enum dmatest_error_type type,
390 unsigned int n, unsigned int src_off, unsigned int dst_off,
391 unsigned int len, unsigned long data)
392 {
393 struct dmatest_thread_result *tr;
394
395 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
396 if (!tr)
397 return -ENOMEM;
398
399 tr->type = type;
400 tr->n = n;
401 tr->src_off = src_off;
402 tr->dst_off = dst_off;
403 tr->len = len;
404 tr->data = data;
405
406 mutex_lock(&info->results_lock);
407 list_add_tail(&tr->node, &r->results);
408 mutex_unlock(&info->results_lock);
409
410 if (tr->type == DMATEST_ET_OK)
411 pr_debug("%s\n", thread_result_get(r->name, tr));
412 else
413 pr_warn("%s\n", thread_result_get(r->name, tr));
414
415 return 0;
416 }
417
418 static unsigned int verify_result_add(struct dmatest_info *info,
419 struct dmatest_result *r, unsigned int n,
420 unsigned int src_off, unsigned int dst_off, unsigned int len,
421 u8 **bufs, int whence, unsigned int counter, u8 pattern,
422 bool is_srcbuf)
423 {
424 struct dmatest_verify_result *vr;
425 unsigned int error_count;
426 unsigned int buf_off = is_srcbuf ? src_off : dst_off;
427 unsigned int start, end;
428
429 if (whence < 0) {
430 start = 0;
431 end = buf_off;
432 } else if (whence > 0) {
433 start = buf_off + len;
434 end = info->params.buf_size;
435 } else {
436 start = buf_off;
437 end = buf_off + len;
438 }
439
440 vr = kmalloc(sizeof(*vr), GFP_KERNEL);
441 if (!vr) {
442 pr_warn("dmatest: No memory to store verify result\n");
443 return dmatest_verify(NULL, bufs, start, end, counter, pattern,
444 is_srcbuf);
445 }
446
447 vr->pattern = pattern;
448 vr->is_srcbuf = is_srcbuf;
449
450 error_count = dmatest_verify(vr, bufs, start, end, counter, pattern,
451 is_srcbuf);
452 if (error_count) {
453 vr->error_count = error_count;
454 thread_result_add(info, r, DMATEST_ET_VERIFY_BUF, n, src_off,
455 dst_off, len, (unsigned long)vr);
456 return error_count;
457 }
458
459 kfree(vr);
460 return 0;
461 }
462
463 static void result_free(struct dmatest_info *info, const char *name)
464 {
465 struct dmatest_result *r, *_r;
466
467 mutex_lock(&info->results_lock);
468 list_for_each_entry_safe(r, _r, &info->results, node) {
469 struct dmatest_thread_result *tr, *_tr;
470
471 if (name && strcmp(r->name, name))
472 continue;
473
474 list_for_each_entry_safe(tr, _tr, &r->results, node) {
475 if (tr->type == DMATEST_ET_VERIFY_BUF)
476 kfree(tr->vr);
477 list_del(&tr->node);
478 kfree(tr);
479 }
480
481 kfree(r->name);
482 list_del(&r->node);
483 kfree(r);
484 }
485
486 mutex_unlock(&info->results_lock);
487 }
488
489 static struct dmatest_result *result_init(struct dmatest_info *info,
490 const char *name)
491 {
492 struct dmatest_result *r;
493
494 r = kzalloc(sizeof(*r), GFP_KERNEL);
495 if (r) {
496 r->name = kstrdup(name, GFP_KERNEL);
497 INIT_LIST_HEAD(&r->results);
498 mutex_lock(&info->results_lock);
499 list_add_tail(&r->node, &info->results);
500 mutex_unlock(&info->results_lock);
501 }
502 return r;
503 }
504
505 /*
506 * This function repeatedly tests DMA transfers of various lengths and
507 * offsets for a given operation type until it is told to exit by
508 * kthread_stop(). There may be multiple threads running this function
509 * in parallel for a single channel, and there may be multiple channels
510 * being tested in parallel.
511 *
512 * Before each test, the source and destination buffer is initialized
513 * with a known pattern. This pattern is different depending on
514 * whether it's in an area which is supposed to be copied or
515 * overwritten, and different in the source and destination buffers.
516 * So if the DMA engine doesn't copy exactly what we tell it to copy,
517 * we'll notice.
518 */
519 static int dmatest_func(void *data)
520 {
521 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait);
522 struct dmatest_thread *thread = data;
523 struct dmatest_done done = { .wait = &done_wait };
524 struct dmatest_info *info;
525 struct dmatest_params *params;
526 struct dma_chan *chan;
527 struct dma_device *dev;
528 const char *thread_name;
529 unsigned int src_off, dst_off, len;
530 unsigned int error_count;
531 unsigned int failed_tests = 0;
532 unsigned int total_tests = 0;
533 dma_cookie_t cookie;
534 enum dma_status status;
535 enum dma_ctrl_flags flags;
536 u8 *pq_coefs = NULL;
537 int ret;
538 int src_cnt;
539 int dst_cnt;
540 int i;
541 struct dmatest_result *result;
542
543 thread_name = current->comm;
544 set_freezable();
545
546 ret = -ENOMEM;
547
548 smp_rmb();
549 info = thread->info;
550 params = &info->params;
551 chan = thread->chan;
552 dev = chan->device;
553 if (thread->type == DMA_MEMCPY)
554 src_cnt = dst_cnt = 1;
555 else if (thread->type == DMA_XOR) {
556 /* force odd to ensure dst = src */
557 src_cnt = min_odd(params->xor_sources | 1, dev->max_xor);
558 dst_cnt = 1;
559 } else if (thread->type == DMA_PQ) {
560 /* force odd to ensure dst = src */
561 src_cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
562 dst_cnt = 2;
563
564 pq_coefs = kmalloc(params->pq_sources+1, GFP_KERNEL);
565 if (!pq_coefs)
566 goto err_thread_type;
567
568 for (i = 0; i < src_cnt; i++)
569 pq_coefs[i] = 1;
570 } else
571 goto err_thread_type;
572
573 result = result_init(info, thread_name);
574 if (!result)
575 goto err_srcs;
576
577 thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL);
578 if (!thread->srcs)
579 goto err_srcs;
580 for (i = 0; i < src_cnt; i++) {
581 thread->srcs[i] = kmalloc(params->buf_size, GFP_KERNEL);
582 if (!thread->srcs[i])
583 goto err_srcbuf;
584 }
585 thread->srcs[i] = NULL;
586
587 thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL);
588 if (!thread->dsts)
589 goto err_dsts;
590 for (i = 0; i < dst_cnt; i++) {
591 thread->dsts[i] = kmalloc(params->buf_size, GFP_KERNEL);
592 if (!thread->dsts[i])
593 goto err_dstbuf;
594 }
595 thread->dsts[i] = NULL;
596
597 set_user_nice(current, 10);
598
599 /*
600 * src buffers are freed by the DMAEngine code with dma_unmap_single()
601 * dst buffers are freed by ourselves below
602 */
603 flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT
604 | DMA_COMPL_SKIP_DEST_UNMAP | DMA_COMPL_SRC_UNMAP_SINGLE;
605
606 while (!kthread_should_stop()
607 && !(params->iterations && total_tests >= params->iterations)) {
608 struct dma_async_tx_descriptor *tx = NULL;
609 dma_addr_t dma_srcs[src_cnt];
610 dma_addr_t dma_dsts[dst_cnt];
611 u8 align = 0;
612
613 total_tests++;
614
615 /* honor alignment restrictions */
616 if (thread->type == DMA_MEMCPY)
617 align = dev->copy_align;
618 else if (thread->type == DMA_XOR)
619 align = dev->xor_align;
620 else if (thread->type == DMA_PQ)
621 align = dev->pq_align;
622
623 if (1 << align > params->buf_size) {
624 pr_err("%u-byte buffer too small for %d-byte alignment\n",
625 params->buf_size, 1 << align);
626 break;
627 }
628
629 len = dmatest_random() % params->buf_size + 1;
630 len = (len >> align) << align;
631 if (!len)
632 len = 1 << align;
633 src_off = dmatest_random() % (params->buf_size - len + 1);
634 dst_off = dmatest_random() % (params->buf_size - len + 1);
635
636 src_off = (src_off >> align) << align;
637 dst_off = (dst_off >> align) << align;
638
639 dmatest_init_srcs(thread->srcs, src_off, len, params->buf_size);
640 dmatest_init_dsts(thread->dsts, dst_off, len, params->buf_size);
641
642 for (i = 0; i < src_cnt; i++) {
643 u8 *buf = thread->srcs[i] + src_off;
644
645 dma_srcs[i] = dma_map_single(dev->dev, buf, len,
646 DMA_TO_DEVICE);
647 ret = dma_mapping_error(dev->dev, dma_srcs[i]);
648 if (ret) {
649 unmap_src(dev->dev, dma_srcs, len, i);
650 thread_result_add(info, result,
651 DMATEST_ET_MAP_SRC,
652 total_tests, src_off, dst_off,
653 len, ret);
654 failed_tests++;
655 continue;
656 }
657 }
658 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
659 for (i = 0; i < dst_cnt; i++) {
660 dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
661 params->buf_size,
662 DMA_BIDIRECTIONAL);
663 ret = dma_mapping_error(dev->dev, dma_dsts[i]);
664 if (ret) {
665 unmap_src(dev->dev, dma_srcs, len, src_cnt);
666 unmap_dst(dev->dev, dma_dsts, params->buf_size,
667 i);
668 thread_result_add(info, result,
669 DMATEST_ET_MAP_DST,
670 total_tests, src_off, dst_off,
671 len, ret);
672 failed_tests++;
673 continue;
674 }
675 }
676
677 if (thread->type == DMA_MEMCPY)
678 tx = dev->device_prep_dma_memcpy(chan,
679 dma_dsts[0] + dst_off,
680 dma_srcs[0], len,
681 flags);
682 else if (thread->type == DMA_XOR)
683 tx = dev->device_prep_dma_xor(chan,
684 dma_dsts[0] + dst_off,
685 dma_srcs, src_cnt,
686 len, flags);
687 else if (thread->type == DMA_PQ) {
688 dma_addr_t dma_pq[dst_cnt];
689
690 for (i = 0; i < dst_cnt; i++)
691 dma_pq[i] = dma_dsts[i] + dst_off;
692 tx = dev->device_prep_dma_pq(chan, dma_pq, dma_srcs,
693 src_cnt, pq_coefs,
694 len, flags);
695 }
696
697 if (!tx) {
698 unmap_src(dev->dev, dma_srcs, len, src_cnt);
699 unmap_dst(dev->dev, dma_dsts, params->buf_size,
700 dst_cnt);
701 thread_result_add(info, result, DMATEST_ET_PREP,
702 total_tests, src_off, dst_off,
703 len, 0);
704 msleep(100);
705 failed_tests++;
706 continue;
707 }
708
709 done.done = false;
710 tx->callback = dmatest_callback;
711 tx->callback_param = &done;
712 cookie = tx->tx_submit(tx);
713
714 if (dma_submit_error(cookie)) {
715 thread_result_add(info, result, DMATEST_ET_SUBMIT,
716 total_tests, src_off, dst_off,
717 len, cookie);
718 msleep(100);
719 failed_tests++;
720 continue;
721 }
722 dma_async_issue_pending(chan);
723
724 wait_event_freezable_timeout(done_wait, done.done,
725 msecs_to_jiffies(params->timeout));
726
727 status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
728
729 if (!done.done) {
730 /*
731 * We're leaving the timed out dma operation with
732 * dangling pointer to done_wait. To make this
733 * correct, we'll need to allocate wait_done for
734 * each test iteration and perform "who's gonna
735 * free it this time?" dancing. For now, just
736 * leave it dangling.
737 */
738 thread_result_add(info, result, DMATEST_ET_TIMEOUT,
739 total_tests, src_off, dst_off,
740 len, 0);
741 failed_tests++;
742 continue;
743 } else if (status != DMA_COMPLETE) {
744 enum dmatest_error_type type = (status == DMA_ERROR) ?
745 DMATEST_ET_DMA_ERROR : DMATEST_ET_DMA_IN_PROGRESS;
746 thread_result_add(info, result, type,
747 total_tests, src_off, dst_off,
748 len, status);
749 failed_tests++;
750 continue;
751 }
752
753 /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
754 unmap_dst(dev->dev, dma_dsts, params->buf_size, dst_cnt);
755
756 error_count = 0;
757
758 pr_debug("%s: verifying source buffer...\n", thread_name);
759 error_count += verify_result_add(info, result, total_tests,
760 src_off, dst_off, len, thread->srcs, -1,
761 0, PATTERN_SRC, true);
762 error_count += verify_result_add(info, result, total_tests,
763 src_off, dst_off, len, thread->srcs, 0,
764 src_off, PATTERN_SRC | PATTERN_COPY, true);
765 error_count += verify_result_add(info, result, total_tests,
766 src_off, dst_off, len, thread->srcs, 1,
767 src_off + len, PATTERN_SRC, true);
768
769 pr_debug("%s: verifying dest buffer...\n", thread_name);
770 error_count += verify_result_add(info, result, total_tests,
771 src_off, dst_off, len, thread->dsts, -1,
772 0, PATTERN_DST, false);
773 error_count += verify_result_add(info, result, total_tests,
774 src_off, dst_off, len, thread->dsts, 0,
775 src_off, PATTERN_SRC | PATTERN_COPY, false);
776 error_count += verify_result_add(info, result, total_tests,
777 src_off, dst_off, len, thread->dsts, 1,
778 dst_off + len, PATTERN_DST, false);
779
780 if (error_count) {
781 thread_result_add(info, result, DMATEST_ET_VERIFY,
782 total_tests, src_off, dst_off,
783 len, error_count);
784 failed_tests++;
785 } else {
786 thread_result_add(info, result, DMATEST_ET_OK,
787 total_tests, src_off, dst_off,
788 len, 0);
789 }
790 }
791
792 ret = 0;
793 for (i = 0; thread->dsts[i]; i++)
794 kfree(thread->dsts[i]);
795 err_dstbuf:
796 kfree(thread->dsts);
797 err_dsts:
798 for (i = 0; thread->srcs[i]; i++)
799 kfree(thread->srcs[i]);
800 err_srcbuf:
801 kfree(thread->srcs);
802 err_srcs:
803 kfree(pq_coefs);
804 err_thread_type:
805 pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
806 thread_name, total_tests, failed_tests, ret);
807
808 /* terminate all transfers on specified channels */
809 if (ret)
810 dmaengine_terminate_all(chan);
811
812 thread->done = true;
813
814 if (params->iterations > 0)
815 while (!kthread_should_stop()) {
816 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit);
817 interruptible_sleep_on(&wait_dmatest_exit);
818 }
819
820 return ret;
821 }
822
823 static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
824 {
825 struct dmatest_thread *thread;
826 struct dmatest_thread *_thread;
827 int ret;
828
829 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
830 ret = kthread_stop(thread->task);
831 pr_debug("dmatest: thread %s exited with status %d\n",
832 thread->task->comm, ret);
833 list_del(&thread->node);
834 kfree(thread);
835 }
836
837 /* terminate all transfers on specified channels */
838 dmaengine_terminate_all(dtc->chan);
839
840 kfree(dtc);
841 }
842
843 static int dmatest_add_threads(struct dmatest_info *info,
844 struct dmatest_chan *dtc, enum dma_transaction_type type)
845 {
846 struct dmatest_params *params = &info->params;
847 struct dmatest_thread *thread;
848 struct dma_chan *chan = dtc->chan;
849 char *op;
850 unsigned int i;
851
852 if (type == DMA_MEMCPY)
853 op = "copy";
854 else if (type == DMA_XOR)
855 op = "xor";
856 else if (type == DMA_PQ)
857 op = "pq";
858 else
859 return -EINVAL;
860
861 for (i = 0; i < params->threads_per_chan; i++) {
862 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
863 if (!thread) {
864 pr_warning("dmatest: No memory for %s-%s%u\n",
865 dma_chan_name(chan), op, i);
866
867 break;
868 }
869 thread->info = info;
870 thread->chan = dtc->chan;
871 thread->type = type;
872 smp_wmb();
873 thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
874 dma_chan_name(chan), op, i);
875 if (IS_ERR(thread->task)) {
876 pr_warning("dmatest: Failed to run thread %s-%s%u\n",
877 dma_chan_name(chan), op, i);
878 kfree(thread);
879 break;
880 }
881
882 /* srcbuf and dstbuf are allocated by the thread itself */
883
884 list_add_tail(&thread->node, &dtc->threads);
885 }
886
887 return i;
888 }
889
890 static int dmatest_add_channel(struct dmatest_info *info,
891 struct dma_chan *chan)
892 {
893 struct dmatest_chan *dtc;
894 struct dma_device *dma_dev = chan->device;
895 unsigned int thread_count = 0;
896 int cnt;
897
898 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
899 if (!dtc) {
900 pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
901 return -ENOMEM;
902 }
903
904 dtc->chan = chan;
905 INIT_LIST_HEAD(&dtc->threads);
906
907 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
908 cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
909 thread_count += cnt > 0 ? cnt : 0;
910 }
911 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
912 cnt = dmatest_add_threads(info, dtc, DMA_XOR);
913 thread_count += cnt > 0 ? cnt : 0;
914 }
915 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
916 cnt = dmatest_add_threads(info, dtc, DMA_PQ);
917 thread_count += cnt > 0 ? cnt : 0;
918 }
919
920 pr_info("dmatest: Started %u threads using %s\n",
921 thread_count, dma_chan_name(chan));
922
923 list_add_tail(&dtc->node, &info->channels);
924 info->nr_channels++;
925
926 return 0;
927 }
928
929 static bool filter(struct dma_chan *chan, void *param)
930 {
931 struct dmatest_params *params = param;
932
933 if (!dmatest_match_channel(params, chan) ||
934 !dmatest_match_device(params, chan->device))
935 return false;
936 else
937 return true;
938 }
939
940 static int __run_threaded_test(struct dmatest_info *info)
941 {
942 dma_cap_mask_t mask;
943 struct dma_chan *chan;
944 struct dmatest_params *params = &info->params;
945 int err = 0;
946
947 dma_cap_zero(mask);
948 dma_cap_set(DMA_MEMCPY, mask);
949 for (;;) {
950 chan = dma_request_channel(mask, filter, params);
951 if (chan) {
952 err = dmatest_add_channel(info, chan);
953 if (err) {
954 dma_release_channel(chan);
955 break; /* add_channel failed, punt */
956 }
957 } else
958 break; /* no more channels available */
959 if (params->max_channels &&
960 info->nr_channels >= params->max_channels)
961 break; /* we have all we need */
962 }
963 return err;
964 }
965
966 #ifndef MODULE
967 static int run_threaded_test(struct dmatest_info *info)
968 {
969 int ret;
970
971 mutex_lock(&info->lock);
972 ret = __run_threaded_test(info);
973 mutex_unlock(&info->lock);
974 return ret;
975 }
976 #endif
977
978 static void __stop_threaded_test(struct dmatest_info *info)
979 {
980 struct dmatest_chan *dtc, *_dtc;
981 struct dma_chan *chan;
982
983 list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
984 list_del(&dtc->node);
985 chan = dtc->chan;
986 dmatest_cleanup_channel(dtc);
987 pr_debug("dmatest: dropped channel %s\n", dma_chan_name(chan));
988 dma_release_channel(chan);
989 }
990
991 info->nr_channels = 0;
992 }
993
994 static void stop_threaded_test(struct dmatest_info *info)
995 {
996 mutex_lock(&info->lock);
997 __stop_threaded_test(info);
998 mutex_unlock(&info->lock);
999 }
1000
1001 static int __restart_threaded_test(struct dmatest_info *info, bool run)
1002 {
1003 struct dmatest_params *params = &info->params;
1004
1005 /* Stop any running test first */
1006 __stop_threaded_test(info);
1007
1008 if (run == false)
1009 return 0;
1010
1011 /* Clear results from previous run */
1012 result_free(info, NULL);
1013
1014 /* Copy test parameters */
1015 params->buf_size = test_buf_size;
1016 strlcpy(params->channel, strim(test_channel), sizeof(params->channel));
1017 strlcpy(params->device, strim(test_device), sizeof(params->device));
1018 params->threads_per_chan = threads_per_chan;
1019 params->max_channels = max_channels;
1020 params->iterations = iterations;
1021 params->xor_sources = xor_sources;
1022 params->pq_sources = pq_sources;
1023 params->timeout = timeout;
1024
1025 /* Run test with new parameters */
1026 return __run_threaded_test(info);
1027 }
1028
1029 static bool __is_threaded_test_run(struct dmatest_info *info)
1030 {
1031 struct dmatest_chan *dtc;
1032
1033 list_for_each_entry(dtc, &info->channels, node) {
1034 struct dmatest_thread *thread;
1035
1036 list_for_each_entry(thread, &dtc->threads, node) {
1037 if (!thread->done)
1038 return true;
1039 }
1040 }
1041
1042 return false;
1043 }
1044
1045 static ssize_t dtf_read_run(struct file *file, char __user *user_buf,
1046 size_t count, loff_t *ppos)
1047 {
1048 struct dmatest_info *info = file->private_data;
1049 char buf[3];
1050
1051 mutex_lock(&info->lock);
1052
1053 if (__is_threaded_test_run(info)) {
1054 buf[0] = 'Y';
1055 } else {
1056 __stop_threaded_test(info);
1057 buf[0] = 'N';
1058 }
1059
1060 mutex_unlock(&info->lock);
1061 buf[1] = '\n';
1062 buf[2] = 0x00;
1063 return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
1064 }
1065
1066 static ssize_t dtf_write_run(struct file *file, const char __user *user_buf,
1067 size_t count, loff_t *ppos)
1068 {
1069 struct dmatest_info *info = file->private_data;
1070 char buf[16];
1071 bool bv;
1072 int ret = 0;
1073
1074 if (copy_from_user(buf, user_buf, min(count, (sizeof(buf) - 1))))
1075 return -EFAULT;
1076
1077 if (strtobool(buf, &bv) == 0) {
1078 mutex_lock(&info->lock);
1079
1080 if (__is_threaded_test_run(info))
1081 ret = -EBUSY;
1082 else
1083 ret = __restart_threaded_test(info, bv);
1084
1085 mutex_unlock(&info->lock);
1086 }
1087
1088 return ret ? ret : count;
1089 }
1090
1091 static const struct file_operations dtf_run_fops = {
1092 .read = dtf_read_run,
1093 .write = dtf_write_run,
1094 .open = simple_open,
1095 .llseek = default_llseek,
1096 };
1097
1098 static int dtf_results_show(struct seq_file *sf, void *data)
1099 {
1100 struct dmatest_info *info = sf->private;
1101 struct dmatest_result *result;
1102 struct dmatest_thread_result *tr;
1103 unsigned int i;
1104
1105 mutex_lock(&info->results_lock);
1106 list_for_each_entry(result, &info->results, node) {
1107 list_for_each_entry(tr, &result->results, node) {
1108 seq_printf(sf, "%s\n",
1109 thread_result_get(result->name, tr));
1110 if (tr->type == DMATEST_ET_VERIFY_BUF) {
1111 for (i = 0; i < tr->vr->error_count; i++) {
1112 seq_printf(sf, "\t%s\n",
1113 verify_result_get_one(tr->vr, i));
1114 }
1115 }
1116 }
1117 }
1118
1119 mutex_unlock(&info->results_lock);
1120 return 0;
1121 }
1122
1123 static int dtf_results_open(struct inode *inode, struct file *file)
1124 {
1125 return single_open(file, dtf_results_show, inode->i_private);
1126 }
1127
1128 static const struct file_operations dtf_results_fops = {
1129 .open = dtf_results_open,
1130 .read = seq_read,
1131 .llseek = seq_lseek,
1132 .release = single_release,
1133 };
1134
1135 static int dmatest_register_dbgfs(struct dmatest_info *info)
1136 {
1137 struct dentry *d;
1138
1139 d = debugfs_create_dir("dmatest", NULL);
1140 if (IS_ERR(d))
1141 return PTR_ERR(d);
1142 if (!d)
1143 goto err_root;
1144
1145 info->root = d;
1146
1147 /* Run or stop threaded test */
1148 debugfs_create_file("run", S_IWUSR | S_IRUGO, info->root, info,
1149 &dtf_run_fops);
1150
1151 /* Results of test in progress */
1152 debugfs_create_file("results", S_IRUGO, info->root, info,
1153 &dtf_results_fops);
1154
1155 return 0;
1156
1157 err_root:
1158 pr_err("dmatest: Failed to initialize debugfs\n");
1159 return -ENOMEM;
1160 }
1161
1162 static int __init dmatest_init(void)
1163 {
1164 struct dmatest_info *info = &test_info;
1165 int ret;
1166
1167 memset(info, 0, sizeof(*info));
1168
1169 mutex_init(&info->lock);
1170 INIT_LIST_HEAD(&info->channels);
1171
1172 mutex_init(&info->results_lock);
1173 INIT_LIST_HEAD(&info->results);
1174
1175 ret = dmatest_register_dbgfs(info);
1176 if (ret)
1177 return ret;
1178
1179 #ifdef MODULE
1180 return 0;
1181 #else
1182 return run_threaded_test(info);
1183 #endif
1184 }
1185 /* when compiled-in wait for drivers to load first */
1186 late_initcall(dmatest_init);
1187
1188 static void __exit dmatest_exit(void)
1189 {
1190 struct dmatest_info *info = &test_info;
1191
1192 debugfs_remove_recursive(info->root);
1193 stop_threaded_test(info);
1194 result_free(info, NULL);
1195 }
1196 module_exit(dmatest_exit);
1197
1198 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1199 MODULE_LICENSE("GPL v2");
Linus' kernel tree