blob: 5589358b684d7ab3e19cefe0bb83aa775ac59fda [file] [log] [blame]
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070018#include <linux/wait.h>
19
20static unsigned int test_buf_size = 16384;
21module_param(test_buf_size, uint, S_IRUGO);
22MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
23
Kay Sievers06190d82008-11-11 13:12:33 -070024static char test_channel[20];
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070025module_param_string(channel, test_channel, sizeof(test_channel), S_IRUGO);
26MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
27
Kay Sievers06190d82008-11-11 13:12:33 -070028static char test_device[20];
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070029module_param_string(device, test_device, sizeof(test_device), S_IRUGO);
30MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
31
32static unsigned int threads_per_chan = 1;
33module_param(threads_per_chan, uint, S_IRUGO);
34MODULE_PARM_DESC(threads_per_chan,
35 "Number of threads to start per channel (default: 1)");
36
37static unsigned int max_channels;
38module_param(max_channels, uint, S_IRUGO);
Dan Williams33df8ca2009-01-06 11:38:15 -070039MODULE_PARM_DESC(max_channels,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070040 "Maximum number of channels to use (default: all)");
41
Nicolas Ferre0a2ff57d2009-07-03 19:26:51 +020042static unsigned int iterations;
43module_param(iterations, uint, S_IRUGO);
44MODULE_PARM_DESC(iterations,
45 "Iterations before stopping test (default: infinite)");
46
Dan Williamsb54d5cb2009-03-25 09:13:25 -070047static unsigned int xor_sources = 3;
48module_param(xor_sources, uint, S_IRUGO);
49MODULE_PARM_DESC(xor_sources,
50 "Number of xor source buffers (default: 3)");
51
Dan Williams58691d62009-08-29 19:09:27 -070052static unsigned int pq_sources = 3;
53module_param(pq_sources, uint, S_IRUGO);
54MODULE_PARM_DESC(pq_sources,
55 "Number of p+q source buffers (default: 3)");
56
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070057/*
58 * Initialization patterns. All bytes in the source buffer has bit 7
59 * set, all bytes in the destination buffer has bit 7 cleared.
60 *
61 * Bit 6 is set for all bytes which are to be copied by the DMA
62 * engine. Bit 5 is set for all bytes which are to be overwritten by
63 * the DMA engine.
64 *
65 * The remaining bits are the inverse of a counter which increments by
66 * one for each byte address.
67 */
68#define PATTERN_SRC 0x80
69#define PATTERN_DST 0x00
70#define PATTERN_COPY 0x40
71#define PATTERN_OVERWRITE 0x20
72#define PATTERN_COUNT_MASK 0x1f
73
74struct dmatest_thread {
75 struct list_head node;
76 struct task_struct *task;
77 struct dma_chan *chan;
Dan Williamsb54d5cb2009-03-25 09:13:25 -070078 u8 **srcs;
79 u8 **dsts;
80 enum dma_transaction_type type;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070081};
82
83struct dmatest_chan {
84 struct list_head node;
85 struct dma_chan *chan;
86 struct list_head threads;
87};
88
89/*
90 * These are protected by dma_list_mutex since they're only used by
Dan Williams33df8ca2009-01-06 11:38:15 -070091 * the DMA filter function callback
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070092 */
93static LIST_HEAD(dmatest_channels);
94static unsigned int nr_channels;
95
96static bool dmatest_match_channel(struct dma_chan *chan)
97{
98 if (test_channel[0] == '\0')
99 return true;
Dan Williams41d5e592009-01-06 11:38:21 -0700100 return strcmp(dma_chan_name(chan), test_channel) == 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700101}
102
103static bool dmatest_match_device(struct dma_device *device)
104{
105 if (test_device[0] == '\0')
106 return true;
Kay Sievers06190d82008-11-11 13:12:33 -0700107 return strcmp(dev_name(device->dev), test_device) == 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700108}
109
110static unsigned long dmatest_random(void)
111{
112 unsigned long buf;
113
114 get_random_bytes(&buf, sizeof(buf));
115 return buf;
116}
117
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700118static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len)
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700119{
120 unsigned int i;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700121 u8 *buf;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700122
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700123 for (; (buf = *bufs); bufs++) {
124 for (i = 0; i < start; i++)
125 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
126 for ( ; i < start + len; i++)
127 buf[i] = PATTERN_SRC | PATTERN_COPY
Joe Perchesc0198942009-06-28 09:26:21 -0700128 | (~i & PATTERN_COUNT_MASK);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700129 for ( ; i < test_buf_size; i++)
130 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
131 buf++;
132 }
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700133}
134
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700135static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len)
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700136{
137 unsigned int i;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700138 u8 *buf;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700139
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700140 for (; (buf = *bufs); bufs++) {
141 for (i = 0; i < start; i++)
142 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
143 for ( ; i < start + len; i++)
144 buf[i] = PATTERN_DST | PATTERN_OVERWRITE
145 | (~i & PATTERN_COUNT_MASK);
146 for ( ; i < test_buf_size; i++)
147 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
148 }
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700149}
150
151static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
152 unsigned int counter, bool is_srcbuf)
153{
154 u8 diff = actual ^ pattern;
155 u8 expected = pattern | (~counter & PATTERN_COUNT_MASK);
156 const char *thread_name = current->comm;
157
158 if (is_srcbuf)
159 pr_warning("%s: srcbuf[0x%x] overwritten!"
160 " Expected %02x, got %02x\n",
161 thread_name, index, expected, actual);
162 else if ((pattern & PATTERN_COPY)
163 && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
164 pr_warning("%s: dstbuf[0x%x] not copied!"
165 " Expected %02x, got %02x\n",
166 thread_name, index, expected, actual);
167 else if (diff & PATTERN_SRC)
168 pr_warning("%s: dstbuf[0x%x] was copied!"
169 " Expected %02x, got %02x\n",
170 thread_name, index, expected, actual);
171 else
172 pr_warning("%s: dstbuf[0x%x] mismatch!"
173 " Expected %02x, got %02x\n",
174 thread_name, index, expected, actual);
175}
176
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700177static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700178 unsigned int end, unsigned int counter, u8 pattern,
179 bool is_srcbuf)
180{
181 unsigned int i;
182 unsigned int error_count = 0;
183 u8 actual;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700184 u8 expected;
185 u8 *buf;
186 unsigned int counter_orig = counter;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700187
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700188 for (; (buf = *bufs); bufs++) {
189 counter = counter_orig;
190 for (i = start; i < end; i++) {
191 actual = buf[i];
192 expected = pattern | (~counter & PATTERN_COUNT_MASK);
193 if (actual != expected) {
194 if (error_count < 32)
195 dmatest_mismatch(actual, pattern, i,
196 counter, is_srcbuf);
197 error_count++;
198 }
199 counter++;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700200 }
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700201 }
202
203 if (error_count > 32)
204 pr_warning("%s: %u errors suppressed\n",
205 current->comm, error_count - 32);
206
207 return error_count;
208}
209
Dan Williamse44e0aa2009-03-25 09:13:25 -0700210static void dmatest_callback(void *completion)
211{
212 complete(completion);
213}
214
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700215/*
216 * This function repeatedly tests DMA transfers of various lengths and
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700217 * offsets for a given operation type until it is told to exit by
218 * kthread_stop(). There may be multiple threads running this function
219 * in parallel for a single channel, and there may be multiple channels
220 * being tested in parallel.
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700221 *
222 * Before each test, the source and destination buffer is initialized
223 * with a known pattern. This pattern is different depending on
224 * whether it's in an area which is supposed to be copied or
225 * overwritten, and different in the source and destination buffers.
226 * So if the DMA engine doesn't copy exactly what we tell it to copy,
227 * we'll notice.
228 */
229static int dmatest_func(void *data)
230{
231 struct dmatest_thread *thread = data;
232 struct dma_chan *chan;
233 const char *thread_name;
234 unsigned int src_off, dst_off, len;
235 unsigned int error_count;
236 unsigned int failed_tests = 0;
237 unsigned int total_tests = 0;
238 dma_cookie_t cookie;
239 enum dma_status status;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700240 enum dma_ctrl_flags flags;
Anatolij Gustschin94de6482010-02-15 22:35:23 +0100241 u8 pq_coefs[pq_sources + 1];
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700242 int ret;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700243 int src_cnt;
244 int dst_cnt;
245 int i;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700246
247 thread_name = current->comm;
248
249 ret = -ENOMEM;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700250
251 smp_rmb();
252 chan = thread->chan;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700253 if (thread->type == DMA_MEMCPY)
254 src_cnt = dst_cnt = 1;
255 else if (thread->type == DMA_XOR) {
256 src_cnt = xor_sources | 1; /* force odd to ensure dst = src */
257 dst_cnt = 1;
Dan Williams58691d62009-08-29 19:09:27 -0700258 } else if (thread->type == DMA_PQ) {
259 src_cnt = pq_sources | 1; /* force odd to ensure dst = src */
260 dst_cnt = 2;
Anatolij Gustschin94de6482010-02-15 22:35:23 +0100261 for (i = 0; i < src_cnt; i++)
Dan Williams58691d62009-08-29 19:09:27 -0700262 pq_coefs[i] = 1;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700263 } else
264 goto err_srcs;
265
266 thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL);
267 if (!thread->srcs)
268 goto err_srcs;
269 for (i = 0; i < src_cnt; i++) {
270 thread->srcs[i] = kmalloc(test_buf_size, GFP_KERNEL);
271 if (!thread->srcs[i])
272 goto err_srcbuf;
273 }
274 thread->srcs[i] = NULL;
275
276 thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL);
277 if (!thread->dsts)
278 goto err_dsts;
279 for (i = 0; i < dst_cnt; i++) {
280 thread->dsts[i] = kmalloc(test_buf_size, GFP_KERNEL);
281 if (!thread->dsts[i])
282 goto err_dstbuf;
283 }
284 thread->dsts[i] = NULL;
285
Dan Williamse44e0aa2009-03-25 09:13:25 -0700286 set_user_nice(current, 10);
287
288 flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP | DMA_PREP_INTERRUPT;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700289
Nicolas Ferre0a2ff57d2009-07-03 19:26:51 +0200290 while (!kthread_should_stop()
291 && !(iterations && total_tests >= iterations)) {
Atsushi Nemotod86be862009-01-13 09:22:20 -0700292 struct dma_device *dev = chan->device;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700293 struct dma_async_tx_descriptor *tx = NULL;
294 dma_addr_t dma_srcs[src_cnt];
295 dma_addr_t dma_dsts[dst_cnt];
Dan Williamse44e0aa2009-03-25 09:13:25 -0700296 struct completion cmp;
297 unsigned long tmo = msecs_to_jiffies(3000);
Dan Williams83544ae2009-09-08 17:42:53 -0700298 u8 align = 0;
Atsushi Nemotod86be862009-01-13 09:22:20 -0700299
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700300 total_tests++;
301
Dan Williams83544ae2009-09-08 17:42:53 -0700302 /* honor alignment restrictions */
303 if (thread->type == DMA_MEMCPY)
304 align = dev->copy_align;
305 else if (thread->type == DMA_XOR)
306 align = dev->xor_align;
307 else if (thread->type == DMA_PQ)
308 align = dev->pq_align;
309
Guennadi Liakhovetskicfe4f272009-12-04 19:44:48 +0100310 if (1 << align > test_buf_size) {
311 pr_err("%u-byte buffer too small for %d-byte alignment\n",
312 test_buf_size, 1 << align);
313 break;
314 }
315
316 len = dmatest_random() % test_buf_size + 1;
Dan Williams83544ae2009-09-08 17:42:53 -0700317 len = (len >> align) << align;
Guennadi Liakhovetskicfe4f272009-12-04 19:44:48 +0100318 if (!len)
319 len = 1 << align;
320 src_off = dmatest_random() % (test_buf_size - len + 1);
321 dst_off = dmatest_random() % (test_buf_size - len + 1);
322
Dan Williams83544ae2009-09-08 17:42:53 -0700323 src_off = (src_off >> align) << align;
324 dst_off = (dst_off >> align) << align;
325
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700326 dmatest_init_srcs(thread->srcs, src_off, len);
327 dmatest_init_dsts(thread->dsts, dst_off, len);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700328
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700329 for (i = 0; i < src_cnt; i++) {
330 u8 *buf = thread->srcs[i] + src_off;
331
332 dma_srcs[i] = dma_map_single(dev->dev, buf, len,
333 DMA_TO_DEVICE);
334 }
Atsushi Nemotod86be862009-01-13 09:22:20 -0700335 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700336 for (i = 0; i < dst_cnt; i++) {
337 dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
338 test_buf_size,
339 DMA_BIDIRECTIONAL);
340 }
Atsushi Nemotod86be862009-01-13 09:22:20 -0700341
Dan Williams83544ae2009-09-08 17:42:53 -0700342
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700343 if (thread->type == DMA_MEMCPY)
344 tx = dev->device_prep_dma_memcpy(chan,
345 dma_dsts[0] + dst_off,
346 dma_srcs[0], len,
347 flags);
348 else if (thread->type == DMA_XOR)
349 tx = dev->device_prep_dma_xor(chan,
350 dma_dsts[0] + dst_off,
Dan Williams67b91242010-02-28 22:20:18 -0700351 dma_srcs, src_cnt,
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700352 len, flags);
Dan Williams58691d62009-08-29 19:09:27 -0700353 else if (thread->type == DMA_PQ) {
354 dma_addr_t dma_pq[dst_cnt];
355
356 for (i = 0; i < dst_cnt; i++)
357 dma_pq[i] = dma_dsts[i] + dst_off;
358 tx = dev->device_prep_dma_pq(chan, dma_pq, dma_srcs,
Anatolij Gustschin94de6482010-02-15 22:35:23 +0100359 src_cnt, pq_coefs,
Dan Williams58691d62009-08-29 19:09:27 -0700360 len, flags);
361 }
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700362
Atsushi Nemotod86be862009-01-13 09:22:20 -0700363 if (!tx) {
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700364 for (i = 0; i < src_cnt; i++)
365 dma_unmap_single(dev->dev, dma_srcs[i], len,
366 DMA_TO_DEVICE);
367 for (i = 0; i < dst_cnt; i++)
368 dma_unmap_single(dev->dev, dma_dsts[i],
369 test_buf_size,
370 DMA_BIDIRECTIONAL);
Atsushi Nemotod86be862009-01-13 09:22:20 -0700371 pr_warning("%s: #%u: prep error with src_off=0x%x "
372 "dst_off=0x%x len=0x%x\n",
373 thread_name, total_tests - 1,
374 src_off, dst_off, len);
375 msleep(100);
376 failed_tests++;
377 continue;
378 }
Dan Williamse44e0aa2009-03-25 09:13:25 -0700379
380 init_completion(&cmp);
381 tx->callback = dmatest_callback;
382 tx->callback_param = &cmp;
Atsushi Nemotod86be862009-01-13 09:22:20 -0700383 cookie = tx->tx_submit(tx);
384
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700385 if (dma_submit_error(cookie)) {
386 pr_warning("%s: #%u: submit error %d with src_off=0x%x "
387 "dst_off=0x%x len=0x%x\n",
388 thread_name, total_tests - 1, cookie,
389 src_off, dst_off, len);
390 msleep(100);
391 failed_tests++;
392 continue;
393 }
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700394 dma_async_issue_pending(chan);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700395
Dan Williamse44e0aa2009-03-25 09:13:25 -0700396 tmo = wait_for_completion_timeout(&cmp, tmo);
397 status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700398
Dan Williamse44e0aa2009-03-25 09:13:25 -0700399 if (tmo == 0) {
400 pr_warning("%s: #%u: test timed out\n",
401 thread_name, total_tests - 1);
402 failed_tests++;
403 continue;
404 } else if (status != DMA_SUCCESS) {
405 pr_warning("%s: #%u: got completion callback,"
406 " but status is \'%s\'\n",
407 thread_name, total_tests - 1,
408 status == DMA_ERROR ? "error" : "in progress");
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700409 failed_tests++;
410 continue;
411 }
Dan Williamse44e0aa2009-03-25 09:13:25 -0700412
Atsushi Nemotod86be862009-01-13 09:22:20 -0700413 /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700414 for (i = 0; i < dst_cnt; i++)
415 dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size,
416 DMA_BIDIRECTIONAL);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700417
418 error_count = 0;
419
420 pr_debug("%s: verifying source buffer...\n", thread_name);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700421 error_count += dmatest_verify(thread->srcs, 0, src_off,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700422 0, PATTERN_SRC, true);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700423 error_count += dmatest_verify(thread->srcs, src_off,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700424 src_off + len, src_off,
425 PATTERN_SRC | PATTERN_COPY, true);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700426 error_count += dmatest_verify(thread->srcs, src_off + len,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700427 test_buf_size, src_off + len,
428 PATTERN_SRC, true);
429
430 pr_debug("%s: verifying dest buffer...\n",
431 thread->task->comm);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700432 error_count += dmatest_verify(thread->dsts, 0, dst_off,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700433 0, PATTERN_DST, false);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700434 error_count += dmatest_verify(thread->dsts, dst_off,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700435 dst_off + len, src_off,
436 PATTERN_SRC | PATTERN_COPY, false);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700437 error_count += dmatest_verify(thread->dsts, dst_off + len,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700438 test_buf_size, dst_off + len,
439 PATTERN_DST, false);
440
441 if (error_count) {
442 pr_warning("%s: #%u: %u errors with "
443 "src_off=0x%x dst_off=0x%x len=0x%x\n",
444 thread_name, total_tests - 1, error_count,
445 src_off, dst_off, len);
446 failed_tests++;
447 } else {
448 pr_debug("%s: #%u: No errors with "
449 "src_off=0x%x dst_off=0x%x len=0x%x\n",
450 thread_name, total_tests - 1,
451 src_off, dst_off, len);
452 }
453 }
454
455 ret = 0;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700456 for (i = 0; thread->dsts[i]; i++)
457 kfree(thread->dsts[i]);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700458err_dstbuf:
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700459 kfree(thread->dsts);
460err_dsts:
461 for (i = 0; thread->srcs[i]; i++)
462 kfree(thread->srcs[i]);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700463err_srcbuf:
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700464 kfree(thread->srcs);
465err_srcs:
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700466 pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
467 thread_name, total_tests, failed_tests, ret);
Nicolas Ferre0a2ff57d2009-07-03 19:26:51 +0200468
469 if (iterations > 0)
470 while (!kthread_should_stop()) {
Yong Zhangb953df72010-02-05 21:52:37 +0800471 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit);
Nicolas Ferre0a2ff57d2009-07-03 19:26:51 +0200472 interruptible_sleep_on(&wait_dmatest_exit);
473 }
474
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700475 return ret;
476}
477
478static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
479{
480 struct dmatest_thread *thread;
481 struct dmatest_thread *_thread;
482 int ret;
483
484 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
485 ret = kthread_stop(thread->task);
486 pr_debug("dmatest: thread %s exited with status %d\n",
487 thread->task->comm, ret);
488 list_del(&thread->node);
489 kfree(thread);
490 }
491 kfree(dtc);
492}
493
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700494static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_type type)
495{
496 struct dmatest_thread *thread;
497 struct dma_chan *chan = dtc->chan;
498 char *op;
499 unsigned int i;
500
501 if (type == DMA_MEMCPY)
502 op = "copy";
503 else if (type == DMA_XOR)
504 op = "xor";
Dan Williams58691d62009-08-29 19:09:27 -0700505 else if (type == DMA_PQ)
506 op = "pq";
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700507 else
508 return -EINVAL;
509
510 for (i = 0; i < threads_per_chan; i++) {
511 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
512 if (!thread) {
513 pr_warning("dmatest: No memory for %s-%s%u\n",
514 dma_chan_name(chan), op, i);
515
516 break;
517 }
518 thread->chan = dtc->chan;
519 thread->type = type;
520 smp_wmb();
521 thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
522 dma_chan_name(chan), op, i);
523 if (IS_ERR(thread->task)) {
524 pr_warning("dmatest: Failed to run thread %s-%s%u\n",
525 dma_chan_name(chan), op, i);
526 kfree(thread);
527 break;
528 }
529
530 /* srcbuf and dstbuf are allocated by the thread itself */
531
532 list_add_tail(&thread->node, &dtc->threads);
533 }
534
535 return i;
536}
537
Dan Williams33df8ca2009-01-06 11:38:15 -0700538static int dmatest_add_channel(struct dma_chan *chan)
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700539{
540 struct dmatest_chan *dtc;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700541 struct dma_device *dma_dev = chan->device;
542 unsigned int thread_count = 0;
Kulikov Vasiliyb9033e62010-07-17 19:19:48 +0400543 int cnt;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700544
Andrew Morton6fdb8bd2008-09-19 04:16:23 -0700545 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700546 if (!dtc) {
Dan Williams41d5e592009-01-06 11:38:21 -0700547 pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
Dan Williams33df8ca2009-01-06 11:38:15 -0700548 return -ENOMEM;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700549 }
550
551 dtc->chan = chan;
552 INIT_LIST_HEAD(&dtc->threads);
553
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700554 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
555 cnt = dmatest_add_threads(dtc, DMA_MEMCPY);
Nicolas Ferref1aef8b2009-07-06 18:19:44 +0200556 thread_count += cnt > 0 ? cnt : 0;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700557 }
558 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
559 cnt = dmatest_add_threads(dtc, DMA_XOR);
Nicolas Ferref1aef8b2009-07-06 18:19:44 +0200560 thread_count += cnt > 0 ? cnt : 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700561 }
Dan Williams58691d62009-08-29 19:09:27 -0700562 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
563 cnt = dmatest_add_threads(dtc, DMA_PQ);
564 thread_count += cnt > 0 ?: 0;
565 }
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700566
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700567 pr_info("dmatest: Started %u threads using %s\n",
568 thread_count, dma_chan_name(chan));
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700569
570 list_add_tail(&dtc->node, &dmatest_channels);
571 nr_channels++;
572
Dan Williams33df8ca2009-01-06 11:38:15 -0700573 return 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700574}
575
Dan Williams7dd60252009-01-06 11:38:19 -0700576static bool filter(struct dma_chan *chan, void *param)
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700577{
Dan Williams33df8ca2009-01-06 11:38:15 -0700578 if (!dmatest_match_channel(chan) || !dmatest_match_device(chan->device))
Dan Williams7dd60252009-01-06 11:38:19 -0700579 return false;
Dan Williams33df8ca2009-01-06 11:38:15 -0700580 else
Dan Williams7dd60252009-01-06 11:38:19 -0700581 return true;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700582}
583
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700584static int __init dmatest_init(void)
585{
Dan Williams33df8ca2009-01-06 11:38:15 -0700586 dma_cap_mask_t mask;
587 struct dma_chan *chan;
588 int err = 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700589
Dan Williams33df8ca2009-01-06 11:38:15 -0700590 dma_cap_zero(mask);
591 dma_cap_set(DMA_MEMCPY, mask);
592 for (;;) {
593 chan = dma_request_channel(mask, filter, NULL);
594 if (chan) {
595 err = dmatest_add_channel(chan);
Dan Williamsc56c81a2009-04-08 15:08:23 -0700596 if (err) {
Dan Williams33df8ca2009-01-06 11:38:15 -0700597 dma_release_channel(chan);
598 break; /* add_channel failed, punt */
599 }
600 } else
601 break; /* no more channels available */
602 if (max_channels && nr_channels >= max_channels)
603 break; /* we have all we need */
604 }
605
606 return err;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700607}
Dan Williams33df8ca2009-01-06 11:38:15 -0700608/* when compiled-in wait for drivers to load first */
609late_initcall(dmatest_init);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700610
611static void __exit dmatest_exit(void)
612{
Dan Williams33df8ca2009-01-06 11:38:15 -0700613 struct dmatest_chan *dtc, *_dtc;
Dan Williams7cbd4872009-03-04 16:06:03 -0700614 struct dma_chan *chan;
Dan Williams33df8ca2009-01-06 11:38:15 -0700615
616 list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) {
617 list_del(&dtc->node);
Dan Williams7cbd4872009-03-04 16:06:03 -0700618 chan = dtc->chan;
Dan Williams33df8ca2009-01-06 11:38:15 -0700619 dmatest_cleanup_channel(dtc);
620 pr_debug("dmatest: dropped channel %s\n",
Dan Williams7cbd4872009-03-04 16:06:03 -0700621 dma_chan_name(chan));
622 dma_release_channel(chan);
Dan Williams33df8ca2009-01-06 11:38:15 -0700623 }
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700624}
625module_exit(dmatest_exit);
626
627MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
628MODULE_LICENSE("GPL v2");