i2c: tegra: remove support for I2C_M_REV_DIR_ADDR
[linux-2.6.git] / drivers / dma / dmatest.c
1 /*
2  * DMA Engine test module
3  *
4  * Copyright (C) 2007 Atmel Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/delay.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/dmaengine.h>
13 #include <linux/init.h>
14 #include <linux/kthread.h>
15 #include <linux/module.h>
16 #include <linux/moduleparam.h>
17 #include <linux/random.h>
18 #include <linux/slab.h>
19 #include <linux/wait.h>
20
21 static unsigned int test_buf_size = 16384;
22 module_param(test_buf_size, uint, S_IRUGO);
23 MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
24
25 static char test_channel[20];
26 module_param_string(channel, test_channel, sizeof(test_channel), S_IRUGO);
27 MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
28
29 static char test_device[20];
30 module_param_string(device, test_device, sizeof(test_device), S_IRUGO);
31 MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
32
33 static unsigned int threads_per_chan = 1;
34 module_param(threads_per_chan, uint, S_IRUGO);
35 MODULE_PARM_DESC(threads_per_chan,
36                 "Number of threads to start per channel (default: 1)");
37
38 static unsigned int max_channels;
39 module_param(max_channels, uint, S_IRUGO);
40 MODULE_PARM_DESC(max_channels,
41                 "Maximum number of channels to use (default: all)");
42
43 static unsigned int iterations;
44 module_param(iterations, uint, S_IRUGO);
45 MODULE_PARM_DESC(iterations,
46                 "Iterations before stopping test (default: infinite)");
47
48 static unsigned int xor_sources = 3;
49 module_param(xor_sources, uint, S_IRUGO);
50 MODULE_PARM_DESC(xor_sources,
51                 "Number of xor source buffers (default: 3)");
52
53 static unsigned int pq_sources = 3;
54 module_param(pq_sources, uint, S_IRUGO);
55 MODULE_PARM_DESC(pq_sources,
56                 "Number of p+q source buffers (default: 3)");
57
58 static int timeout = 3000;
59 module_param(timeout, uint, S_IRUGO);
60 MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
61                  "Pass -1 for infinite timeout");
62
63 /*
64  * Initialization patterns. All bytes in the source buffer has bit 7
65  * set, all bytes in the destination buffer has bit 7 cleared.
66  *
67  * Bit 6 is set for all bytes which are to be copied by the DMA
68  * engine. Bit 5 is set for all bytes which are to be overwritten by
69  * the DMA engine.
70  *
71  * The remaining bits are the inverse of a counter which increments by
72  * one for each byte address.
73  */
74 #define PATTERN_SRC             0x80
75 #define PATTERN_DST             0x00
76 #define PATTERN_COPY            0x40
77 #define PATTERN_OVERWRITE       0x20
78 #define PATTERN_COUNT_MASK      0x1f
79
80 struct dmatest_thread {
81         struct list_head        node;
82         struct task_struct      *task;
83         struct dma_chan         *chan;
84         u8                      **srcs;
85         u8                      **dsts;
86         enum dma_transaction_type type;
87 };
88
89 struct dmatest_chan {
90         struct list_head        node;
91         struct dma_chan         *chan;
92         struct list_head        threads;
93 };
94
95 /*
96  * These are protected by dma_list_mutex since they're only used by
97  * the DMA filter function callback
98  */
99 static LIST_HEAD(dmatest_channels);
100 static unsigned int nr_channels;
101
102 static bool dmatest_match_channel(struct dma_chan *chan)
103 {
104         if (test_channel[0] == '\0')
105                 return true;
106         return strcmp(dma_chan_name(chan), test_channel) == 0;
107 }
108
109 static bool dmatest_match_device(struct dma_device *device)
110 {
111         if (test_device[0] == '\0')
112                 return true;
113         return strcmp(dev_name(device->dev), test_device) == 0;
114 }
115
116 static unsigned long dmatest_random(void)
117 {
118         unsigned long buf;
119
120         get_random_bytes(&buf, sizeof(buf));
121         return buf;
122 }
123
124 static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len)
125 {
126         unsigned int i;
127         u8 *buf;
128
129         for (; (buf = *bufs); bufs++) {
130                 for (i = 0; i < start; i++)
131                         buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
132                 for ( ; i < start + len; i++)
133                         buf[i] = PATTERN_SRC | PATTERN_COPY
134                                 | (~i & PATTERN_COUNT_MASK);
135                 for ( ; i < test_buf_size; i++)
136                         buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
137                 buf++;
138         }
139 }
140
141 static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len)
142 {
143         unsigned int i;
144         u8 *buf;
145
146         for (; (buf = *bufs); bufs++) {
147                 for (i = 0; i < start; i++)
148                         buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
149                 for ( ; i < start + len; i++)
150                         buf[i] = PATTERN_DST | PATTERN_OVERWRITE
151                                 | (~i & PATTERN_COUNT_MASK);
152                 for ( ; i < test_buf_size; i++)
153                         buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
154         }
155 }
156
157 static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
158                 unsigned int counter, bool is_srcbuf)
159 {
160         u8              diff = actual ^ pattern;
161         u8              expected = pattern | (~counter & PATTERN_COUNT_MASK);
162         const char      *thread_name = current->comm;
163
164         if (is_srcbuf)
165                 pr_warning("%s: srcbuf[0x%x] overwritten!"
166                                 " Expected %02x, got %02x\n",
167                                 thread_name, index, expected, actual);
168         else if ((pattern & PATTERN_COPY)
169                         && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
170                 pr_warning("%s: dstbuf[0x%x] not copied!"
171                                 " Expected %02x, got %02x\n",
172                                 thread_name, index, expected, actual);
173         else if (diff & PATTERN_SRC)
174                 pr_warning("%s: dstbuf[0x%x] was copied!"
175                                 " Expected %02x, got %02x\n",
176                                 thread_name, index, expected, actual);
177         else
178                 pr_warning("%s: dstbuf[0x%x] mismatch!"
179                                 " Expected %02x, got %02x\n",
180                                 thread_name, index, expected, actual);
181 }
182
183 static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
184                 unsigned int end, unsigned int counter, u8 pattern,
185                 bool is_srcbuf)
186 {
187         unsigned int i;
188         unsigned int error_count = 0;
189         u8 actual;
190         u8 expected;
191         u8 *buf;
192         unsigned int counter_orig = counter;
193
194         for (; (buf = *bufs); bufs++) {
195                 counter = counter_orig;
196                 for (i = start; i < end; i++) {
197                         actual = buf[i];
198                         expected = pattern | (~counter & PATTERN_COUNT_MASK);
199                         if (actual != expected) {
200                                 if (error_count < 32)
201                                         dmatest_mismatch(actual, pattern, i,
202                                                          counter, is_srcbuf);
203                                 error_count++;
204                         }
205                         counter++;
206                 }
207         }
208
209         if (error_count > 32)
210                 pr_warning("%s: %u errors suppressed\n",
211                         current->comm, error_count - 32);
212
213         return error_count;
214 }
215
216 static void dmatest_callback(void *completion)
217 {
218         complete(completion);
219 }
220
221 /*
222  * This function repeatedly tests DMA transfers of various lengths and
223  * offsets for a given operation type until it is told to exit by
224  * kthread_stop(). There may be multiple threads running this function
225  * in parallel for a single channel, and there may be multiple channels
226  * being tested in parallel.
227  *
228  * Before each test, the source and destination buffer is initialized
229  * with a known pattern. This pattern is different depending on
230  * whether it's in an area which is supposed to be copied or
231  * overwritten, and different in the source and destination buffers.
232  * So if the DMA engine doesn't copy exactly what we tell it to copy,
233  * we'll notice.
234  */
235 static int dmatest_func(void *data)
236 {
237         struct dmatest_thread   *thread = data;
238         struct dma_chan         *chan;
239         const char              *thread_name;
240         unsigned int            src_off, dst_off, len;
241         unsigned int            error_count;
242         unsigned int            failed_tests = 0;
243         unsigned int            total_tests = 0;
244         dma_cookie_t            cookie;
245         enum dma_status         status;
246         enum dma_ctrl_flags     flags;
247         u8                      pq_coefs[pq_sources + 1];
248         int                     ret;
249         int                     src_cnt;
250         int                     dst_cnt;
251         int                     i;
252
253         thread_name = current->comm;
254
255         ret = -ENOMEM;
256
257         smp_rmb();
258         chan = thread->chan;
259         if (thread->type == DMA_MEMCPY)
260                 src_cnt = dst_cnt = 1;
261         else if (thread->type == DMA_XOR) {
262                 src_cnt = xor_sources | 1; /* force odd to ensure dst = src */
263                 dst_cnt = 1;
264         } else if (thread->type == DMA_PQ) {
265                 src_cnt = pq_sources | 1; /* force odd to ensure dst = src */
266                 dst_cnt = 2;
267                 for (i = 0; i < src_cnt; i++)
268                         pq_coefs[i] = 1;
269         } else
270                 goto err_srcs;
271
272         thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL);
273         if (!thread->srcs)
274                 goto err_srcs;
275         for (i = 0; i < src_cnt; i++) {
276                 thread->srcs[i] = kmalloc(test_buf_size, GFP_KERNEL);
277                 if (!thread->srcs[i])
278                         goto err_srcbuf;
279         }
280         thread->srcs[i] = NULL;
281
282         thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL);
283         if (!thread->dsts)
284                 goto err_dsts;
285         for (i = 0; i < dst_cnt; i++) {
286                 thread->dsts[i] = kmalloc(test_buf_size, GFP_KERNEL);
287                 if (!thread->dsts[i])
288                         goto err_dstbuf;
289         }
290         thread->dsts[i] = NULL;
291
292         set_user_nice(current, 10);
293
294         /*
295          * src buffers are freed by the DMAEngine code with dma_unmap_single()
296          * dst buffers are freed by ourselves below
297          */
298         flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT
299               | DMA_COMPL_SKIP_DEST_UNMAP | DMA_COMPL_SRC_UNMAP_SINGLE;
300
301         while (!kthread_should_stop()
302                && !(iterations && total_tests >= iterations)) {
303                 struct dma_device *dev = chan->device;
304                 struct dma_async_tx_descriptor *tx = NULL;
305                 dma_addr_t dma_srcs[src_cnt];
306                 dma_addr_t dma_dsts[dst_cnt];
307                 struct completion cmp;
308                 unsigned long tmo = msecs_to_jiffies(timeout);
309                 u8 align = 0;
310
311                 total_tests++;
312
313                 /* honor alignment restrictions */
314                 if (thread->type == DMA_MEMCPY)
315                         align = dev->copy_align;
316                 else if (thread->type == DMA_XOR)
317                         align = dev->xor_align;
318                 else if (thread->type == DMA_PQ)
319                         align = dev->pq_align;
320
321                 if (1 << align > test_buf_size) {
322                         pr_err("%u-byte buffer too small for %d-byte alignment\n",
323                                test_buf_size, 1 << align);
324                         break;
325                 }
326
327                 len = dmatest_random() % test_buf_size + 1;
328                 len = (len >> align) << align;
329                 if (!len)
330                         len = 1 << align;
331                 src_off = dmatest_random() % (test_buf_size - len + 1);
332                 dst_off = dmatest_random() % (test_buf_size - len + 1);
333
334                 src_off = (src_off >> align) << align;
335                 dst_off = (dst_off >> align) << align;
336
337                 dmatest_init_srcs(thread->srcs, src_off, len);
338                 dmatest_init_dsts(thread->dsts, dst_off, len);
339
340                 for (i = 0; i < src_cnt; i++) {
341                         u8 *buf = thread->srcs[i] + src_off;
342
343                         dma_srcs[i] = dma_map_single(dev->dev, buf, len,
344                                                      DMA_TO_DEVICE);
345                 }
346                 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
347                 for (i = 0; i < dst_cnt; i++) {
348                         dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
349                                                      test_buf_size,
350                                                      DMA_BIDIRECTIONAL);
351                 }
352
353
354                 if (thread->type == DMA_MEMCPY)
355                         tx = dev->device_prep_dma_memcpy(chan,
356                                                          dma_dsts[0] + dst_off,
357                                                          dma_srcs[0], len,
358                                                          flags);
359                 else if (thread->type == DMA_XOR)
360                         tx = dev->device_prep_dma_xor(chan,
361                                                       dma_dsts[0] + dst_off,
362                                                       dma_srcs, src_cnt,
363                                                       len, flags);
364                 else if (thread->type == DMA_PQ) {
365                         dma_addr_t dma_pq[dst_cnt];
366
367                         for (i = 0; i < dst_cnt; i++)
368                                 dma_pq[i] = dma_dsts[i] + dst_off;
369                         tx = dev->device_prep_dma_pq(chan, dma_pq, dma_srcs,
370                                                      src_cnt, pq_coefs,
371                                                      len, flags);
372                 }
373
374                 if (!tx) {
375                         for (i = 0; i < src_cnt; i++)
376                                 dma_unmap_single(dev->dev, dma_srcs[i], len,
377                                                  DMA_TO_DEVICE);
378                         for (i = 0; i < dst_cnt; i++)
379                                 dma_unmap_single(dev->dev, dma_dsts[i],
380                                                  test_buf_size,
381                                                  DMA_BIDIRECTIONAL);
382                         pr_warning("%s: #%u: prep error with src_off=0x%x "
383                                         "dst_off=0x%x len=0x%x\n",
384                                         thread_name, total_tests - 1,
385                                         src_off, dst_off, len);
386                         msleep(100);
387                         failed_tests++;
388                         continue;
389                 }
390
391                 init_completion(&cmp);
392                 tx->callback = dmatest_callback;
393                 tx->callback_param = &cmp;
394                 cookie = tx->tx_submit(tx);
395
396                 if (dma_submit_error(cookie)) {
397                         pr_warning("%s: #%u: submit error %d with src_off=0x%x "
398                                         "dst_off=0x%x len=0x%x\n",
399                                         thread_name, total_tests - 1, cookie,
400                                         src_off, dst_off, len);
401                         msleep(100);
402                         failed_tests++;
403                         continue;
404                 }
405                 dma_async_issue_pending(chan);
406
407                 tmo = wait_for_completion_timeout(&cmp, tmo);
408                 status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
409
410                 if (tmo == 0) {
411                         pr_warning("%s: #%u: test timed out\n",
412                                    thread_name, total_tests - 1);
413                         failed_tests++;
414                         continue;
415                 } else if (status != DMA_SUCCESS) {
416                         pr_warning("%s: #%u: got completion callback,"
417                                    " but status is \'%s\'\n",
418                                    thread_name, total_tests - 1,
419                                    status == DMA_ERROR ? "error" : "in progress");
420                         failed_tests++;
421                         continue;
422                 }
423
424                 /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
425                 for (i = 0; i < dst_cnt; i++)
426                         dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size,
427                                          DMA_BIDIRECTIONAL);
428
429                 error_count = 0;
430
431                 pr_debug("%s: verifying source buffer...\n", thread_name);
432                 error_count += dmatest_verify(thread->srcs, 0, src_off,
433                                 0, PATTERN_SRC, true);
434                 error_count += dmatest_verify(thread->srcs, src_off,
435                                 src_off + len, src_off,
436                                 PATTERN_SRC | PATTERN_COPY, true);
437                 error_count += dmatest_verify(thread->srcs, src_off + len,
438                                 test_buf_size, src_off + len,
439                                 PATTERN_SRC, true);
440
441                 pr_debug("%s: verifying dest buffer...\n",
442                                 thread->task->comm);
443                 error_count += dmatest_verify(thread->dsts, 0, dst_off,
444                                 0, PATTERN_DST, false);
445                 error_count += dmatest_verify(thread->dsts, dst_off,
446                                 dst_off + len, src_off,
447                                 PATTERN_SRC | PATTERN_COPY, false);
448                 error_count += dmatest_verify(thread->dsts, dst_off + len,
449                                 test_buf_size, dst_off + len,
450                                 PATTERN_DST, false);
451
452                 if (error_count) {
453                         pr_warning("%s: #%u: %u errors with "
454                                 "src_off=0x%x dst_off=0x%x len=0x%x\n",
455                                 thread_name, total_tests - 1, error_count,
456                                 src_off, dst_off, len);
457                         failed_tests++;
458                 } else {
459                         pr_debug("%s: #%u: No errors with "
460                                 "src_off=0x%x dst_off=0x%x len=0x%x\n",
461                                 thread_name, total_tests - 1,
462                                 src_off, dst_off, len);
463                 }
464         }
465
466         ret = 0;
467         for (i = 0; thread->dsts[i]; i++)
468                 kfree(thread->dsts[i]);
469 err_dstbuf:
470         kfree(thread->dsts);
471 err_dsts:
472         for (i = 0; thread->srcs[i]; i++)
473                 kfree(thread->srcs[i]);
474 err_srcbuf:
475         kfree(thread->srcs);
476 err_srcs:
477         pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
478                         thread_name, total_tests, failed_tests, ret);
479
480         if (iterations > 0)
481                 while (!kthread_should_stop()) {
482                         DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit);
483                         interruptible_sleep_on(&wait_dmatest_exit);
484                 }
485
486         return ret;
487 }
488
489 static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
490 {
491         struct dmatest_thread   *thread;
492         struct dmatest_thread   *_thread;
493         int                     ret;
494
495         list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
496                 ret = kthread_stop(thread->task);
497                 pr_debug("dmatest: thread %s exited with status %d\n",
498                                 thread->task->comm, ret);
499                 list_del(&thread->node);
500                 kfree(thread);
501         }
502         kfree(dtc);
503 }
504
505 static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_type type)
506 {
507         struct dmatest_thread *thread;
508         struct dma_chan *chan = dtc->chan;
509         char *op;
510         unsigned int i;
511
512         if (type == DMA_MEMCPY)
513                 op = "copy";
514         else if (type == DMA_XOR)
515                 op = "xor";
516         else if (type == DMA_PQ)
517                 op = "pq";
518         else
519                 return -EINVAL;
520
521         for (i = 0; i < threads_per_chan; i++) {
522                 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
523                 if (!thread) {
524                         pr_warning("dmatest: No memory for %s-%s%u\n",
525                                    dma_chan_name(chan), op, i);
526
527                         break;
528                 }
529                 thread->chan = dtc->chan;
530                 thread->type = type;
531                 smp_wmb();
532                 thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
533                                 dma_chan_name(chan), op, i);
534                 if (IS_ERR(thread->task)) {
535                         pr_warning("dmatest: Failed to run thread %s-%s%u\n",
536                                         dma_chan_name(chan), op, i);
537                         kfree(thread);
538                         break;
539                 }
540
541                 /* srcbuf and dstbuf are allocated by the thread itself */
542
543                 list_add_tail(&thread->node, &dtc->threads);
544         }
545
546         return i;
547 }
548
549 static int dmatest_add_channel(struct dma_chan *chan)
550 {
551         struct dmatest_chan     *dtc;
552         struct dma_device       *dma_dev = chan->device;
553         unsigned int            thread_count = 0;
554         int cnt;
555
556         dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
557         if (!dtc) {
558                 pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
559                 return -ENOMEM;
560         }
561
562         dtc->chan = chan;
563         INIT_LIST_HEAD(&dtc->threads);
564
565         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
566                 cnt = dmatest_add_threads(dtc, DMA_MEMCPY);
567                 thread_count += cnt > 0 ? cnt : 0;
568         }
569         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
570                 cnt = dmatest_add_threads(dtc, DMA_XOR);
571                 thread_count += cnt > 0 ? cnt : 0;
572         }
573         if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
574                 cnt = dmatest_add_threads(dtc, DMA_PQ);
575                 thread_count += cnt > 0 ?: 0;
576         }
577
578         pr_info("dmatest: Started %u threads using %s\n",
579                 thread_count, dma_chan_name(chan));
580
581         list_add_tail(&dtc->node, &dmatest_channels);
582         nr_channels++;
583
584         return 0;
585 }
586
587 static bool filter(struct dma_chan *chan, void *param)
588 {
589         if (!dmatest_match_channel(chan) || !dmatest_match_device(chan->device))
590                 return false;
591         else
592                 return true;
593 }
594
595 static int __init dmatest_init(void)
596 {
597         dma_cap_mask_t mask;
598         struct dma_chan *chan;
599         int err = 0;
600
601         dma_cap_zero(mask);
602         dma_cap_set(DMA_MEMCPY, mask);
603         for (;;) {
604                 chan = dma_request_channel(mask, filter, NULL);
605                 if (chan) {
606                         err = dmatest_add_channel(chan);
607                         if (err) {
608                                 dma_release_channel(chan);
609                                 break; /* add_channel failed, punt */
610                         }
611                 } else
612                         break; /* no more channels available */
613                 if (max_channels && nr_channels >= max_channels)
614                         break; /* we have all we need */
615         }
616
617         return err;
618 }
619 /* when compiled-in wait for drivers to load first */
620 late_initcall(dmatest_init);
621
622 static void __exit dmatest_exit(void)
623 {
624         struct dmatest_chan *dtc, *_dtc;
625         struct dma_chan *chan;
626
627         list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) {
628                 list_del(&dtc->node);
629                 chan = dtc->chan;
630                 dmatest_cleanup_channel(dtc);
631                 pr_debug("dmatest: dropped channel %s\n",
632                          dma_chan_name(chan));
633                 dma_release_channel(chan);
634         }
635 }
636 module_exit(dmatest_exit);
637
638 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
639 MODULE_LICENSE("GPL v2");