Commit | Line | Data |
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4a776f0a HS |
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/dmaengine.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/kthread.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/moduleparam.h> | |
16 | #include <linux/random.h> | |
17 | #include <linux/wait.h> | |
18 | ||
19 | static unsigned int test_buf_size = 16384; | |
20 | module_param(test_buf_size, uint, S_IRUGO); | |
21 | MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer"); | |
22 | ||
06190d84 | 23 | static char test_channel[20]; |
4a776f0a HS |
24 | module_param_string(channel, test_channel, sizeof(test_channel), S_IRUGO); |
25 | MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)"); | |
26 | ||
06190d84 | 27 | static char test_device[20]; |
4a776f0a HS |
28 | module_param_string(device, test_device, sizeof(test_device), S_IRUGO); |
29 | MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)"); | |
30 | ||
31 | static unsigned int threads_per_chan = 1; | |
32 | module_param(threads_per_chan, uint, S_IRUGO); | |
33 | MODULE_PARM_DESC(threads_per_chan, | |
34 | "Number of threads to start per channel (default: 1)"); | |
35 | ||
36 | static unsigned int max_channels; | |
37 | module_param(max_channels, uint, S_IRUGO); | |
33df8ca0 | 38 | MODULE_PARM_DESC(max_channels, |
4a776f0a HS |
39 | "Maximum number of channels to use (default: all)"); |
40 | ||
b54d5cb9 DW |
41 | static unsigned int xor_sources = 3; |
42 | module_param(xor_sources, uint, S_IRUGO); | |
43 | MODULE_PARM_DESC(xor_sources, | |
44 | "Number of xor source buffers (default: 3)"); | |
45 | ||
4a776f0a HS |
46 | /* |
47 | * Initialization patterns. All bytes in the source buffer has bit 7 | |
48 | * set, all bytes in the destination buffer has bit 7 cleared. | |
49 | * | |
50 | * Bit 6 is set for all bytes which are to be copied by the DMA | |
51 | * engine. Bit 5 is set for all bytes which are to be overwritten by | |
52 | * the DMA engine. | |
53 | * | |
54 | * The remaining bits are the inverse of a counter which increments by | |
55 | * one for each byte address. | |
56 | */ | |
57 | #define PATTERN_SRC 0x80 | |
58 | #define PATTERN_DST 0x00 | |
59 | #define PATTERN_COPY 0x40 | |
60 | #define PATTERN_OVERWRITE 0x20 | |
61 | #define PATTERN_COUNT_MASK 0x1f | |
62 | ||
63 | struct dmatest_thread { | |
64 | struct list_head node; | |
65 | struct task_struct *task; | |
66 | struct dma_chan *chan; | |
b54d5cb9 DW |
67 | u8 **srcs; |
68 | u8 **dsts; | |
69 | enum dma_transaction_type type; | |
4a776f0a HS |
70 | }; |
71 | ||
72 | struct dmatest_chan { | |
73 | struct list_head node; | |
74 | struct dma_chan *chan; | |
75 | struct list_head threads; | |
76 | }; | |
77 | ||
78 | /* | |
79 | * These are protected by dma_list_mutex since they're only used by | |
33df8ca0 | 80 | * the DMA filter function callback |
4a776f0a HS |
81 | */ |
82 | static LIST_HEAD(dmatest_channels); | |
83 | static unsigned int nr_channels; | |
84 | ||
85 | static bool dmatest_match_channel(struct dma_chan *chan) | |
86 | { | |
87 | if (test_channel[0] == '\0') | |
88 | return true; | |
41d5e59c | 89 | return strcmp(dma_chan_name(chan), test_channel) == 0; |
4a776f0a HS |
90 | } |
91 | ||
92 | static bool dmatest_match_device(struct dma_device *device) | |
93 | { | |
94 | if (test_device[0] == '\0') | |
95 | return true; | |
06190d84 | 96 | return strcmp(dev_name(device->dev), test_device) == 0; |
4a776f0a HS |
97 | } |
98 | ||
99 | static unsigned long dmatest_random(void) | |
100 | { | |
101 | unsigned long buf; | |
102 | ||
103 | get_random_bytes(&buf, sizeof(buf)); | |
104 | return buf; | |
105 | } | |
106 | ||
b54d5cb9 | 107 | static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len) |
4a776f0a HS |
108 | { |
109 | unsigned int i; | |
b54d5cb9 DW |
110 | u8 *buf; |
111 | ||
112 | for (; (buf = *bufs); bufs++) { | |
113 | for (i = 0; i < start; i++) | |
114 | buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK); | |
115 | for ( ; i < start + len; i++) | |
116 | buf[i] = PATTERN_SRC | PATTERN_COPY | |
117 | | (~i & PATTERN_COUNT_MASK);; | |
118 | for ( ; i < test_buf_size; i++) | |
119 | buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK); | |
120 | buf++; | |
121 | } | |
4a776f0a HS |
122 | } |
123 | ||
b54d5cb9 | 124 | static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len) |
4a776f0a HS |
125 | { |
126 | unsigned int i; | |
b54d5cb9 DW |
127 | u8 *buf; |
128 | ||
129 | for (; (buf = *bufs); bufs++) { | |
130 | for (i = 0; i < start; i++) | |
131 | buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK); | |
132 | for ( ; i < start + len; i++) | |
133 | buf[i] = PATTERN_DST | PATTERN_OVERWRITE | |
134 | | (~i & PATTERN_COUNT_MASK); | |
135 | for ( ; i < test_buf_size; i++) | |
136 | buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK); | |
137 | } | |
4a776f0a HS |
138 | } |
139 | ||
140 | static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index, | |
141 | unsigned int counter, bool is_srcbuf) | |
142 | { | |
143 | u8 diff = actual ^ pattern; | |
144 | u8 expected = pattern | (~counter & PATTERN_COUNT_MASK); | |
145 | const char *thread_name = current->comm; | |
146 | ||
147 | if (is_srcbuf) | |
148 | pr_warning("%s: srcbuf[0x%x] overwritten!" | |
149 | " Expected %02x, got %02x\n", | |
150 | thread_name, index, expected, actual); | |
151 | else if ((pattern & PATTERN_COPY) | |
152 | && (diff & (PATTERN_COPY | PATTERN_OVERWRITE))) | |
153 | pr_warning("%s: dstbuf[0x%x] not copied!" | |
154 | " Expected %02x, got %02x\n", | |
155 | thread_name, index, expected, actual); | |
156 | else if (diff & PATTERN_SRC) | |
157 | pr_warning("%s: dstbuf[0x%x] was copied!" | |
158 | " Expected %02x, got %02x\n", | |
159 | thread_name, index, expected, actual); | |
160 | else | |
161 | pr_warning("%s: dstbuf[0x%x] mismatch!" | |
162 | " Expected %02x, got %02x\n", | |
163 | thread_name, index, expected, actual); | |
164 | } | |
165 | ||
b54d5cb9 | 166 | static unsigned int dmatest_verify(u8 **bufs, unsigned int start, |
4a776f0a HS |
167 | unsigned int end, unsigned int counter, u8 pattern, |
168 | bool is_srcbuf) | |
169 | { | |
170 | unsigned int i; | |
171 | unsigned int error_count = 0; | |
172 | u8 actual; | |
b54d5cb9 DW |
173 | u8 expected; |
174 | u8 *buf; | |
175 | unsigned int counter_orig = counter; | |
176 | ||
177 | for (; (buf = *bufs); bufs++) { | |
178 | counter = counter_orig; | |
179 | for (i = start; i < end; i++) { | |
180 | actual = buf[i]; | |
181 | expected = pattern | (~counter & PATTERN_COUNT_MASK); | |
182 | if (actual != expected) { | |
183 | if (error_count < 32) | |
184 | dmatest_mismatch(actual, pattern, i, | |
185 | counter, is_srcbuf); | |
186 | error_count++; | |
187 | } | |
188 | counter++; | |
4a776f0a | 189 | } |
4a776f0a HS |
190 | } |
191 | ||
192 | if (error_count > 32) | |
193 | pr_warning("%s: %u errors suppressed\n", | |
194 | current->comm, error_count - 32); | |
195 | ||
196 | return error_count; | |
197 | } | |
198 | ||
e44e0aa3 DW |
199 | static void dmatest_callback(void *completion) |
200 | { | |
201 | complete(completion); | |
202 | } | |
203 | ||
4a776f0a HS |
204 | /* |
205 | * This function repeatedly tests DMA transfers of various lengths and | |
b54d5cb9 DW |
206 | * offsets for a given operation type until it is told to exit by |
207 | * kthread_stop(). There may be multiple threads running this function | |
208 | * in parallel for a single channel, and there may be multiple channels | |
209 | * being tested in parallel. | |
4a776f0a HS |
210 | * |
211 | * Before each test, the source and destination buffer is initialized | |
212 | * with a known pattern. This pattern is different depending on | |
213 | * whether it's in an area which is supposed to be copied or | |
214 | * overwritten, and different in the source and destination buffers. | |
215 | * So if the DMA engine doesn't copy exactly what we tell it to copy, | |
216 | * we'll notice. | |
217 | */ | |
218 | static int dmatest_func(void *data) | |
219 | { | |
220 | struct dmatest_thread *thread = data; | |
221 | struct dma_chan *chan; | |
222 | const char *thread_name; | |
223 | unsigned int src_off, dst_off, len; | |
224 | unsigned int error_count; | |
225 | unsigned int failed_tests = 0; | |
226 | unsigned int total_tests = 0; | |
227 | dma_cookie_t cookie; | |
228 | enum dma_status status; | |
b54d5cb9 | 229 | enum dma_ctrl_flags flags; |
4a776f0a | 230 | int ret; |
b54d5cb9 DW |
231 | int src_cnt; |
232 | int dst_cnt; | |
233 | int i; | |
4a776f0a HS |
234 | |
235 | thread_name = current->comm; | |
236 | ||
237 | ret = -ENOMEM; | |
4a776f0a HS |
238 | |
239 | smp_rmb(); | |
240 | chan = thread->chan; | |
b54d5cb9 DW |
241 | if (thread->type == DMA_MEMCPY) |
242 | src_cnt = dst_cnt = 1; | |
243 | else if (thread->type == DMA_XOR) { | |
244 | src_cnt = xor_sources | 1; /* force odd to ensure dst = src */ | |
245 | dst_cnt = 1; | |
246 | } else | |
247 | goto err_srcs; | |
248 | ||
249 | thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL); | |
250 | if (!thread->srcs) | |
251 | goto err_srcs; | |
252 | for (i = 0; i < src_cnt; i++) { | |
253 | thread->srcs[i] = kmalloc(test_buf_size, GFP_KERNEL); | |
254 | if (!thread->srcs[i]) | |
255 | goto err_srcbuf; | |
256 | } | |
257 | thread->srcs[i] = NULL; | |
258 | ||
259 | thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL); | |
260 | if (!thread->dsts) | |
261 | goto err_dsts; | |
262 | for (i = 0; i < dst_cnt; i++) { | |
263 | thread->dsts[i] = kmalloc(test_buf_size, GFP_KERNEL); | |
264 | if (!thread->dsts[i]) | |
265 | goto err_dstbuf; | |
266 | } | |
267 | thread->dsts[i] = NULL; | |
268 | ||
e44e0aa3 DW |
269 | set_user_nice(current, 10); |
270 | ||
271 | flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP | DMA_PREP_INTERRUPT; | |
4a776f0a HS |
272 | |
273 | while (!kthread_should_stop()) { | |
d86be86e | 274 | struct dma_device *dev = chan->device; |
b54d5cb9 DW |
275 | struct dma_async_tx_descriptor *tx = NULL; |
276 | dma_addr_t dma_srcs[src_cnt]; | |
277 | dma_addr_t dma_dsts[dst_cnt]; | |
e44e0aa3 DW |
278 | struct completion cmp; |
279 | unsigned long tmo = msecs_to_jiffies(3000); | |
d86be86e | 280 | |
4a776f0a HS |
281 | total_tests++; |
282 | ||
283 | len = dmatest_random() % test_buf_size + 1; | |
284 | src_off = dmatest_random() % (test_buf_size - len + 1); | |
285 | dst_off = dmatest_random() % (test_buf_size - len + 1); | |
286 | ||
b54d5cb9 DW |
287 | dmatest_init_srcs(thread->srcs, src_off, len); |
288 | dmatest_init_dsts(thread->dsts, dst_off, len); | |
4a776f0a | 289 | |
b54d5cb9 DW |
290 | for (i = 0; i < src_cnt; i++) { |
291 | u8 *buf = thread->srcs[i] + src_off; | |
292 | ||
293 | dma_srcs[i] = dma_map_single(dev->dev, buf, len, | |
294 | DMA_TO_DEVICE); | |
295 | } | |
d86be86e | 296 | /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */ |
b54d5cb9 DW |
297 | for (i = 0; i < dst_cnt; i++) { |
298 | dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i], | |
299 | test_buf_size, | |
300 | DMA_BIDIRECTIONAL); | |
301 | } | |
302 | ||
303 | if (thread->type == DMA_MEMCPY) | |
304 | tx = dev->device_prep_dma_memcpy(chan, | |
305 | dma_dsts[0] + dst_off, | |
306 | dma_srcs[0], len, | |
307 | flags); | |
308 | else if (thread->type == DMA_XOR) | |
309 | tx = dev->device_prep_dma_xor(chan, | |
310 | dma_dsts[0] + dst_off, | |
311 | dma_srcs, xor_sources, | |
312 | len, flags); | |
d86be86e | 313 | |
d86be86e | 314 | if (!tx) { |
b54d5cb9 DW |
315 | for (i = 0; i < src_cnt; i++) |
316 | dma_unmap_single(dev->dev, dma_srcs[i], len, | |
317 | DMA_TO_DEVICE); | |
318 | for (i = 0; i < dst_cnt; i++) | |
319 | dma_unmap_single(dev->dev, dma_dsts[i], | |
320 | test_buf_size, | |
321 | DMA_BIDIRECTIONAL); | |
d86be86e AN |
322 | pr_warning("%s: #%u: prep error with src_off=0x%x " |
323 | "dst_off=0x%x len=0x%x\n", | |
324 | thread_name, total_tests - 1, | |
325 | src_off, dst_off, len); | |
326 | msleep(100); | |
327 | failed_tests++; | |
328 | continue; | |
329 | } | |
e44e0aa3 DW |
330 | |
331 | init_completion(&cmp); | |
332 | tx->callback = dmatest_callback; | |
333 | tx->callback_param = &cmp; | |
d86be86e AN |
334 | cookie = tx->tx_submit(tx); |
335 | ||
4a776f0a HS |
336 | if (dma_submit_error(cookie)) { |
337 | pr_warning("%s: #%u: submit error %d with src_off=0x%x " | |
338 | "dst_off=0x%x len=0x%x\n", | |
339 | thread_name, total_tests - 1, cookie, | |
340 | src_off, dst_off, len); | |
341 | msleep(100); | |
342 | failed_tests++; | |
343 | continue; | |
344 | } | |
b54d5cb9 | 345 | dma_async_issue_pending(chan); |
4a776f0a | 346 | |
e44e0aa3 DW |
347 | tmo = wait_for_completion_timeout(&cmp, tmo); |
348 | status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); | |
4a776f0a | 349 | |
e44e0aa3 DW |
350 | if (tmo == 0) { |
351 | pr_warning("%s: #%u: test timed out\n", | |
352 | thread_name, total_tests - 1); | |
353 | failed_tests++; | |
354 | continue; | |
355 | } else if (status != DMA_SUCCESS) { | |
356 | pr_warning("%s: #%u: got completion callback," | |
357 | " but status is \'%s\'\n", | |
358 | thread_name, total_tests - 1, | |
359 | status == DMA_ERROR ? "error" : "in progress"); | |
4a776f0a HS |
360 | failed_tests++; |
361 | continue; | |
362 | } | |
e44e0aa3 | 363 | |
d86be86e | 364 | /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */ |
b54d5cb9 DW |
365 | for (i = 0; i < dst_cnt; i++) |
366 | dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size, | |
367 | DMA_BIDIRECTIONAL); | |
4a776f0a HS |
368 | |
369 | error_count = 0; | |
370 | ||
371 | pr_debug("%s: verifying source buffer...\n", thread_name); | |
b54d5cb9 | 372 | error_count += dmatest_verify(thread->srcs, 0, src_off, |
4a776f0a | 373 | 0, PATTERN_SRC, true); |
b54d5cb9 | 374 | error_count += dmatest_verify(thread->srcs, src_off, |
4a776f0a HS |
375 | src_off + len, src_off, |
376 | PATTERN_SRC | PATTERN_COPY, true); | |
b54d5cb9 | 377 | error_count += dmatest_verify(thread->srcs, src_off + len, |
4a776f0a HS |
378 | test_buf_size, src_off + len, |
379 | PATTERN_SRC, true); | |
380 | ||
381 | pr_debug("%s: verifying dest buffer...\n", | |
382 | thread->task->comm); | |
b54d5cb9 | 383 | error_count += dmatest_verify(thread->dsts, 0, dst_off, |
4a776f0a | 384 | 0, PATTERN_DST, false); |
b54d5cb9 | 385 | error_count += dmatest_verify(thread->dsts, dst_off, |
4a776f0a HS |
386 | dst_off + len, src_off, |
387 | PATTERN_SRC | PATTERN_COPY, false); | |
b54d5cb9 | 388 | error_count += dmatest_verify(thread->dsts, dst_off + len, |
4a776f0a HS |
389 | test_buf_size, dst_off + len, |
390 | PATTERN_DST, false); | |
391 | ||
392 | if (error_count) { | |
393 | pr_warning("%s: #%u: %u errors with " | |
394 | "src_off=0x%x dst_off=0x%x len=0x%x\n", | |
395 | thread_name, total_tests - 1, error_count, | |
396 | src_off, dst_off, len); | |
397 | failed_tests++; | |
398 | } else { | |
399 | pr_debug("%s: #%u: No errors with " | |
400 | "src_off=0x%x dst_off=0x%x len=0x%x\n", | |
401 | thread_name, total_tests - 1, | |
402 | src_off, dst_off, len); | |
403 | } | |
404 | } | |
405 | ||
406 | ret = 0; | |
b54d5cb9 DW |
407 | for (i = 0; thread->dsts[i]; i++) |
408 | kfree(thread->dsts[i]); | |
4a776f0a | 409 | err_dstbuf: |
b54d5cb9 DW |
410 | kfree(thread->dsts); |
411 | err_dsts: | |
412 | for (i = 0; thread->srcs[i]; i++) | |
413 | kfree(thread->srcs[i]); | |
4a776f0a | 414 | err_srcbuf: |
b54d5cb9 DW |
415 | kfree(thread->srcs); |
416 | err_srcs: | |
4a776f0a HS |
417 | pr_notice("%s: terminating after %u tests, %u failures (status %d)\n", |
418 | thread_name, total_tests, failed_tests, ret); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | static void dmatest_cleanup_channel(struct dmatest_chan *dtc) | |
423 | { | |
424 | struct dmatest_thread *thread; | |
425 | struct dmatest_thread *_thread; | |
426 | int ret; | |
427 | ||
428 | list_for_each_entry_safe(thread, _thread, &dtc->threads, node) { | |
429 | ret = kthread_stop(thread->task); | |
430 | pr_debug("dmatest: thread %s exited with status %d\n", | |
431 | thread->task->comm, ret); | |
432 | list_del(&thread->node); | |
433 | kfree(thread); | |
434 | } | |
435 | kfree(dtc); | |
436 | } | |
437 | ||
b54d5cb9 | 438 | static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_type type) |
4a776f0a | 439 | { |
b54d5cb9 DW |
440 | struct dmatest_thread *thread; |
441 | struct dma_chan *chan = dtc->chan; | |
442 | char *op; | |
443 | unsigned int i; | |
4a776f0a | 444 | |
b54d5cb9 DW |
445 | if (type == DMA_MEMCPY) |
446 | op = "copy"; | |
447 | else if (type == DMA_XOR) | |
448 | op = "xor"; | |
449 | else | |
450 | return -EINVAL; | |
4a776f0a HS |
451 | |
452 | for (i = 0; i < threads_per_chan; i++) { | |
453 | thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL); | |
454 | if (!thread) { | |
b54d5cb9 DW |
455 | pr_warning("dmatest: No memory for %s-%s%u\n", |
456 | dma_chan_name(chan), op, i); | |
457 | ||
4a776f0a HS |
458 | break; |
459 | } | |
460 | thread->chan = dtc->chan; | |
b54d5cb9 | 461 | thread->type = type; |
4a776f0a | 462 | smp_wmb(); |
b54d5cb9 DW |
463 | thread->task = kthread_run(dmatest_func, thread, "%s-%s%u", |
464 | dma_chan_name(chan), op, i); | |
4a776f0a | 465 | if (IS_ERR(thread->task)) { |
b54d5cb9 DW |
466 | pr_warning("dmatest: Failed to run thread %s-%s%u\n", |
467 | dma_chan_name(chan), op, i); | |
4a776f0a HS |
468 | kfree(thread); |
469 | break; | |
470 | } | |
471 | ||
472 | /* srcbuf and dstbuf are allocated by the thread itself */ | |
473 | ||
474 | list_add_tail(&thread->node, &dtc->threads); | |
475 | } | |
476 | ||
b54d5cb9 DW |
477 | return i; |
478 | } | |
479 | ||
480 | static int dmatest_add_channel(struct dma_chan *chan) | |
481 | { | |
482 | struct dmatest_chan *dtc; | |
483 | struct dma_device *dma_dev = chan->device; | |
484 | unsigned int thread_count = 0; | |
485 | unsigned int cnt; | |
486 | ||
487 | dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL); | |
488 | if (!dtc) { | |
489 | pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan)); | |
490 | return -ENOMEM; | |
491 | } | |
492 | ||
493 | dtc->chan = chan; | |
494 | INIT_LIST_HEAD(&dtc->threads); | |
495 | ||
496 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { | |
497 | cnt = dmatest_add_threads(dtc, DMA_MEMCPY); | |
498 | thread_count += cnt > 0 ?: 0; | |
499 | } | |
500 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { | |
501 | cnt = dmatest_add_threads(dtc, DMA_XOR); | |
502 | thread_count += cnt > 0 ?: 0; | |
503 | } | |
504 | ||
505 | pr_info("dmatest: Started %u threads using %s\n", | |
506 | thread_count, dma_chan_name(chan)); | |
4a776f0a HS |
507 | |
508 | list_add_tail(&dtc->node, &dmatest_channels); | |
509 | nr_channels++; | |
510 | ||
33df8ca0 | 511 | return 0; |
4a776f0a HS |
512 | } |
513 | ||
7dd60251 | 514 | static bool filter(struct dma_chan *chan, void *param) |
4a776f0a | 515 | { |
33df8ca0 | 516 | if (!dmatest_match_channel(chan) || !dmatest_match_device(chan->device)) |
7dd60251 | 517 | return false; |
33df8ca0 | 518 | else |
7dd60251 | 519 | return true; |
4a776f0a HS |
520 | } |
521 | ||
4a776f0a HS |
522 | static int __init dmatest_init(void) |
523 | { | |
33df8ca0 DW |
524 | dma_cap_mask_t mask; |
525 | struct dma_chan *chan; | |
526 | int err = 0; | |
527 | ||
528 | dma_cap_zero(mask); | |
529 | dma_cap_set(DMA_MEMCPY, mask); | |
530 | for (;;) { | |
531 | chan = dma_request_channel(mask, filter, NULL); | |
532 | if (chan) { | |
533 | err = dmatest_add_channel(chan); | |
534 | if (err == 0) | |
535 | continue; | |
536 | else { | |
537 | dma_release_channel(chan); | |
538 | break; /* add_channel failed, punt */ | |
539 | } | |
540 | } else | |
541 | break; /* no more channels available */ | |
542 | if (max_channels && nr_channels >= max_channels) | |
543 | break; /* we have all we need */ | |
544 | } | |
4a776f0a | 545 | |
33df8ca0 | 546 | return err; |
4a776f0a | 547 | } |
33df8ca0 DW |
548 | /* when compiled-in wait for drivers to load first */ |
549 | late_initcall(dmatest_init); | |
4a776f0a HS |
550 | |
551 | static void __exit dmatest_exit(void) | |
552 | { | |
33df8ca0 | 553 | struct dmatest_chan *dtc, *_dtc; |
7cbd4877 | 554 | struct dma_chan *chan; |
33df8ca0 DW |
555 | |
556 | list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) { | |
557 | list_del(&dtc->node); | |
7cbd4877 | 558 | chan = dtc->chan; |
33df8ca0 DW |
559 | dmatest_cleanup_channel(dtc); |
560 | pr_debug("dmatest: dropped channel %s\n", | |
7cbd4877 DW |
561 | dma_chan_name(chan)); |
562 | dma_release_channel(chan); | |
33df8ca0 | 563 | } |
4a776f0a HS |
564 | } |
565 | module_exit(dmatest_exit); | |
566 | ||
567 | MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>"); | |
568 | MODULE_LICENSE("GPL v2"); |