blob: d93017fc7872d1f0fe3904ff85870ff8aee1156a [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>
17#include <linux/wait.h>
18
19static unsigned int test_buf_size = 16384;
20module_param(test_buf_size, uint, S_IRUGO);
21MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
22
Kay Sievers06190d82008-11-11 13:12:33 -070023static char test_channel[20];
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070024module_param_string(channel, test_channel, sizeof(test_channel), S_IRUGO);
25MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
26
Kay Sievers06190d82008-11-11 13:12:33 -070027static char test_device[20];
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070028module_param_string(device, test_device, sizeof(test_device), S_IRUGO);
29MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
30
31static unsigned int threads_per_chan = 1;
32module_param(threads_per_chan, uint, S_IRUGO);
33MODULE_PARM_DESC(threads_per_chan,
34 "Number of threads to start per channel (default: 1)");
35
36static unsigned int max_channels;
37module_param(max_channels, uint, S_IRUGO);
Dan Williams33df8ca2009-01-06 11:38:15 -070038MODULE_PARM_DESC(max_channels,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070039 "Maximum number of channels to use (default: all)");
40
Nicolas Ferre0a2ff57d2009-07-03 19:26:51 +020041static unsigned int iterations;
42module_param(iterations, uint, S_IRUGO);
43MODULE_PARM_DESC(iterations,
44 "Iterations before stopping test (default: infinite)");
45
Dan Williamsb54d5cb2009-03-25 09:13:25 -070046static unsigned int xor_sources = 3;
47module_param(xor_sources, uint, S_IRUGO);
48MODULE_PARM_DESC(xor_sources,
49 "Number of xor source buffers (default: 3)");
50
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070051/*
52 * Initialization patterns. All bytes in the source buffer has bit 7
53 * set, all bytes in the destination buffer has bit 7 cleared.
54 *
55 * Bit 6 is set for all bytes which are to be copied by the DMA
56 * engine. Bit 5 is set for all bytes which are to be overwritten by
57 * the DMA engine.
58 *
59 * The remaining bits are the inverse of a counter which increments by
60 * one for each byte address.
61 */
62#define PATTERN_SRC 0x80
63#define PATTERN_DST 0x00
64#define PATTERN_COPY 0x40
65#define PATTERN_OVERWRITE 0x20
66#define PATTERN_COUNT_MASK 0x1f
67
68struct dmatest_thread {
69 struct list_head node;
70 struct task_struct *task;
71 struct dma_chan *chan;
Dan Williamsb54d5cb2009-03-25 09:13:25 -070072 u8 **srcs;
73 u8 **dsts;
74 enum dma_transaction_type type;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070075};
76
77struct dmatest_chan {
78 struct list_head node;
79 struct dma_chan *chan;
80 struct list_head threads;
81};
82
83/*
84 * These are protected by dma_list_mutex since they're only used by
Dan Williams33df8ca2009-01-06 11:38:15 -070085 * the DMA filter function callback
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070086 */
87static LIST_HEAD(dmatest_channels);
88static unsigned int nr_channels;
89
90static bool dmatest_match_channel(struct dma_chan *chan)
91{
92 if (test_channel[0] == '\0')
93 return true;
Dan Williams41d5e592009-01-06 11:38:21 -070094 return strcmp(dma_chan_name(chan), test_channel) == 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -070095}
96
97static bool dmatest_match_device(struct dma_device *device)
98{
99 if (test_device[0] == '\0')
100 return true;
Kay Sievers06190d82008-11-11 13:12:33 -0700101 return strcmp(dev_name(device->dev), test_device) == 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700102}
103
104static unsigned long dmatest_random(void)
105{
106 unsigned long buf;
107
108 get_random_bytes(&buf, sizeof(buf));
109 return buf;
110}
111
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700112static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len)
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700113{
114 unsigned int i;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700115 u8 *buf;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700116
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700117 for (; (buf = *bufs); bufs++) {
118 for (i = 0; i < start; i++)
119 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
120 for ( ; i < start + len; i++)
121 buf[i] = PATTERN_SRC | PATTERN_COPY
Joe Perchesc0198942009-06-28 09:26:21 -0700122 | (~i & PATTERN_COUNT_MASK);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700123 for ( ; i < test_buf_size; i++)
124 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
125 buf++;
126 }
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700127}
128
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700129static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len)
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700130{
131 unsigned int i;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700132 u8 *buf;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700133
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700134 for (; (buf = *bufs); bufs++) {
135 for (i = 0; i < start; i++)
136 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
137 for ( ; i < start + len; i++)
138 buf[i] = PATTERN_DST | PATTERN_OVERWRITE
139 | (~i & PATTERN_COUNT_MASK);
140 for ( ; i < test_buf_size; i++)
141 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
142 }
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700143}
144
145static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
146 unsigned int counter, bool is_srcbuf)
147{
148 u8 diff = actual ^ pattern;
149 u8 expected = pattern | (~counter & PATTERN_COUNT_MASK);
150 const char *thread_name = current->comm;
151
152 if (is_srcbuf)
153 pr_warning("%s: srcbuf[0x%x] overwritten!"
154 " Expected %02x, got %02x\n",
155 thread_name, index, expected, actual);
156 else if ((pattern & PATTERN_COPY)
157 && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
158 pr_warning("%s: dstbuf[0x%x] not copied!"
159 " Expected %02x, got %02x\n",
160 thread_name, index, expected, actual);
161 else if (diff & PATTERN_SRC)
162 pr_warning("%s: dstbuf[0x%x] was copied!"
163 " Expected %02x, got %02x\n",
164 thread_name, index, expected, actual);
165 else
166 pr_warning("%s: dstbuf[0x%x] mismatch!"
167 " Expected %02x, got %02x\n",
168 thread_name, index, expected, actual);
169}
170
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700171static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700172 unsigned int end, unsigned int counter, u8 pattern,
173 bool is_srcbuf)
174{
175 unsigned int i;
176 unsigned int error_count = 0;
177 u8 actual;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700178 u8 expected;
179 u8 *buf;
180 unsigned int counter_orig = counter;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700181
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700182 for (; (buf = *bufs); bufs++) {
183 counter = counter_orig;
184 for (i = start; i < end; i++) {
185 actual = buf[i];
186 expected = pattern | (~counter & PATTERN_COUNT_MASK);
187 if (actual != expected) {
188 if (error_count < 32)
189 dmatest_mismatch(actual, pattern, i,
190 counter, is_srcbuf);
191 error_count++;
192 }
193 counter++;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700194 }
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700195 }
196
197 if (error_count > 32)
198 pr_warning("%s: %u errors suppressed\n",
199 current->comm, error_count - 32);
200
201 return error_count;
202}
203
Dan Williamse44e0aa2009-03-25 09:13:25 -0700204static void dmatest_callback(void *completion)
205{
206 complete(completion);
207}
208
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700209/*
210 * This function repeatedly tests DMA transfers of various lengths and
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700211 * offsets for a given operation type until it is told to exit by
212 * kthread_stop(). There may be multiple threads running this function
213 * in parallel for a single channel, and there may be multiple channels
214 * being tested in parallel.
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700215 *
216 * Before each test, the source and destination buffer is initialized
217 * with a known pattern. This pattern is different depending on
218 * whether it's in an area which is supposed to be copied or
219 * overwritten, and different in the source and destination buffers.
220 * So if the DMA engine doesn't copy exactly what we tell it to copy,
221 * we'll notice.
222 */
223static int dmatest_func(void *data)
224{
225 struct dmatest_thread *thread = data;
226 struct dma_chan *chan;
227 const char *thread_name;
228 unsigned int src_off, dst_off, len;
229 unsigned int error_count;
230 unsigned int failed_tests = 0;
231 unsigned int total_tests = 0;
232 dma_cookie_t cookie;
233 enum dma_status status;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700234 enum dma_ctrl_flags flags;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700235 int ret;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700236 int src_cnt;
237 int dst_cnt;
238 int i;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700239
240 thread_name = current->comm;
241
242 ret = -ENOMEM;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700243
244 smp_rmb();
245 chan = thread->chan;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700246 if (thread->type == DMA_MEMCPY)
247 src_cnt = dst_cnt = 1;
248 else if (thread->type == DMA_XOR) {
249 src_cnt = xor_sources | 1; /* force odd to ensure dst = src */
250 dst_cnt = 1;
251 } else
252 goto err_srcs;
253
254 thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL);
255 if (!thread->srcs)
256 goto err_srcs;
257 for (i = 0; i < src_cnt; i++) {
258 thread->srcs[i] = kmalloc(test_buf_size, GFP_KERNEL);
259 if (!thread->srcs[i])
260 goto err_srcbuf;
261 }
262 thread->srcs[i] = NULL;
263
264 thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL);
265 if (!thread->dsts)
266 goto err_dsts;
267 for (i = 0; i < dst_cnt; i++) {
268 thread->dsts[i] = kmalloc(test_buf_size, GFP_KERNEL);
269 if (!thread->dsts[i])
270 goto err_dstbuf;
271 }
272 thread->dsts[i] = NULL;
273
Dan Williamse44e0aa2009-03-25 09:13:25 -0700274 set_user_nice(current, 10);
275
276 flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP | DMA_PREP_INTERRUPT;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700277
Nicolas Ferre0a2ff57d2009-07-03 19:26:51 +0200278 while (!kthread_should_stop()
279 && !(iterations && total_tests >= iterations)) {
Atsushi Nemotod86be862009-01-13 09:22:20 -0700280 struct dma_device *dev = chan->device;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700281 struct dma_async_tx_descriptor *tx = NULL;
282 dma_addr_t dma_srcs[src_cnt];
283 dma_addr_t dma_dsts[dst_cnt];
Dan Williamse44e0aa2009-03-25 09:13:25 -0700284 struct completion cmp;
285 unsigned long tmo = msecs_to_jiffies(3000);
Atsushi Nemotod86be862009-01-13 09:22:20 -0700286
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700287 total_tests++;
288
289 len = dmatest_random() % test_buf_size + 1;
290 src_off = dmatest_random() % (test_buf_size - len + 1);
291 dst_off = dmatest_random() % (test_buf_size - len + 1);
292
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700293 dmatest_init_srcs(thread->srcs, src_off, len);
294 dmatest_init_dsts(thread->dsts, dst_off, len);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700295
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700296 for (i = 0; i < src_cnt; i++) {
297 u8 *buf = thread->srcs[i] + src_off;
298
299 dma_srcs[i] = dma_map_single(dev->dev, buf, len,
300 DMA_TO_DEVICE);
301 }
Atsushi Nemotod86be862009-01-13 09:22:20 -0700302 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700303 for (i = 0; i < dst_cnt; i++) {
304 dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
305 test_buf_size,
306 DMA_BIDIRECTIONAL);
307 }
Atsushi Nemotod86be862009-01-13 09:22:20 -0700308
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700309 if (thread->type == DMA_MEMCPY)
310 tx = dev->device_prep_dma_memcpy(chan,
311 dma_dsts[0] + dst_off,
312 dma_srcs[0], len,
313 flags);
314 else if (thread->type == DMA_XOR)
315 tx = dev->device_prep_dma_xor(chan,
316 dma_dsts[0] + dst_off,
317 dma_srcs, xor_sources,
318 len, flags);
319
Atsushi Nemotod86be862009-01-13 09:22:20 -0700320 if (!tx) {
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700321 for (i = 0; i < src_cnt; i++)
322 dma_unmap_single(dev->dev, dma_srcs[i], len,
323 DMA_TO_DEVICE);
324 for (i = 0; i < dst_cnt; i++)
325 dma_unmap_single(dev->dev, dma_dsts[i],
326 test_buf_size,
327 DMA_BIDIRECTIONAL);
Atsushi Nemotod86be862009-01-13 09:22:20 -0700328 pr_warning("%s: #%u: prep error with src_off=0x%x "
329 "dst_off=0x%x len=0x%x\n",
330 thread_name, total_tests - 1,
331 src_off, dst_off, len);
332 msleep(100);
333 failed_tests++;
334 continue;
335 }
Dan Williamse44e0aa2009-03-25 09:13:25 -0700336
337 init_completion(&cmp);
338 tx->callback = dmatest_callback;
339 tx->callback_param = &cmp;
Atsushi Nemotod86be862009-01-13 09:22:20 -0700340 cookie = tx->tx_submit(tx);
341
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700342 if (dma_submit_error(cookie)) {
343 pr_warning("%s: #%u: submit error %d with src_off=0x%x "
344 "dst_off=0x%x len=0x%x\n",
345 thread_name, total_tests - 1, cookie,
346 src_off, dst_off, len);
347 msleep(100);
348 failed_tests++;
349 continue;
350 }
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700351 dma_async_issue_pending(chan);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700352
Dan Williamse44e0aa2009-03-25 09:13:25 -0700353 tmo = wait_for_completion_timeout(&cmp, tmo);
354 status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700355
Dan Williamse44e0aa2009-03-25 09:13:25 -0700356 if (tmo == 0) {
357 pr_warning("%s: #%u: test timed out\n",
358 thread_name, total_tests - 1);
359 failed_tests++;
360 continue;
361 } else if (status != DMA_SUCCESS) {
362 pr_warning("%s: #%u: got completion callback,"
363 " but status is \'%s\'\n",
364 thread_name, total_tests - 1,
365 status == DMA_ERROR ? "error" : "in progress");
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700366 failed_tests++;
367 continue;
368 }
Dan Williamse44e0aa2009-03-25 09:13:25 -0700369
Atsushi Nemotod86be862009-01-13 09:22:20 -0700370 /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700371 for (i = 0; i < dst_cnt; i++)
372 dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size,
373 DMA_BIDIRECTIONAL);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700374
375 error_count = 0;
376
377 pr_debug("%s: verifying source buffer...\n", thread_name);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700378 error_count += dmatest_verify(thread->srcs, 0, src_off,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700379 0, PATTERN_SRC, true);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700380 error_count += dmatest_verify(thread->srcs, src_off,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700381 src_off + len, src_off,
382 PATTERN_SRC | PATTERN_COPY, true);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700383 error_count += dmatest_verify(thread->srcs, src_off + len,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700384 test_buf_size, src_off + len,
385 PATTERN_SRC, true);
386
387 pr_debug("%s: verifying dest buffer...\n",
388 thread->task->comm);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700389 error_count += dmatest_verify(thread->dsts, 0, dst_off,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700390 0, PATTERN_DST, false);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700391 error_count += dmatest_verify(thread->dsts, dst_off,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700392 dst_off + len, src_off,
393 PATTERN_SRC | PATTERN_COPY, false);
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700394 error_count += dmatest_verify(thread->dsts, dst_off + len,
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700395 test_buf_size, dst_off + len,
396 PATTERN_DST, false);
397
398 if (error_count) {
399 pr_warning("%s: #%u: %u errors with "
400 "src_off=0x%x dst_off=0x%x len=0x%x\n",
401 thread_name, total_tests - 1, error_count,
402 src_off, dst_off, len);
403 failed_tests++;
404 } else {
405 pr_debug("%s: #%u: No errors with "
406 "src_off=0x%x dst_off=0x%x len=0x%x\n",
407 thread_name, total_tests - 1,
408 src_off, dst_off, len);
409 }
410 }
411
412 ret = 0;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700413 for (i = 0; thread->dsts[i]; i++)
414 kfree(thread->dsts[i]);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700415err_dstbuf:
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700416 kfree(thread->dsts);
417err_dsts:
418 for (i = 0; thread->srcs[i]; i++)
419 kfree(thread->srcs[i]);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700420err_srcbuf:
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700421 kfree(thread->srcs);
422err_srcs:
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700423 pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
424 thread_name, total_tests, failed_tests, ret);
Nicolas Ferre0a2ff57d2009-07-03 19:26:51 +0200425
426 if (iterations > 0)
427 while (!kthread_should_stop()) {
428 DECLARE_WAIT_QUEUE_HEAD(wait_dmatest_exit);
429 interruptible_sleep_on(&wait_dmatest_exit);
430 }
431
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700432 return ret;
433}
434
435static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
436{
437 struct dmatest_thread *thread;
438 struct dmatest_thread *_thread;
439 int ret;
440
441 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
442 ret = kthread_stop(thread->task);
443 pr_debug("dmatest: thread %s exited with status %d\n",
444 thread->task->comm, ret);
445 list_del(&thread->node);
446 kfree(thread);
447 }
448 kfree(dtc);
449}
450
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700451static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_type type)
452{
453 struct dmatest_thread *thread;
454 struct dma_chan *chan = dtc->chan;
455 char *op;
456 unsigned int i;
457
458 if (type == DMA_MEMCPY)
459 op = "copy";
460 else if (type == DMA_XOR)
461 op = "xor";
462 else
463 return -EINVAL;
464
465 for (i = 0; i < threads_per_chan; i++) {
466 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
467 if (!thread) {
468 pr_warning("dmatest: No memory for %s-%s%u\n",
469 dma_chan_name(chan), op, i);
470
471 break;
472 }
473 thread->chan = dtc->chan;
474 thread->type = type;
475 smp_wmb();
476 thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
477 dma_chan_name(chan), op, i);
478 if (IS_ERR(thread->task)) {
479 pr_warning("dmatest: Failed to run thread %s-%s%u\n",
480 dma_chan_name(chan), op, i);
481 kfree(thread);
482 break;
483 }
484
485 /* srcbuf and dstbuf are allocated by the thread itself */
486
487 list_add_tail(&thread->node, &dtc->threads);
488 }
489
490 return i;
491}
492
Dan Williams33df8ca2009-01-06 11:38:15 -0700493static int dmatest_add_channel(struct dma_chan *chan)
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700494{
495 struct dmatest_chan *dtc;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700496 struct dma_device *dma_dev = chan->device;
497 unsigned int thread_count = 0;
498 unsigned int cnt;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700499
Andrew Morton6fdb8bd2008-09-19 04:16:23 -0700500 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700501 if (!dtc) {
Dan Williams41d5e592009-01-06 11:38:21 -0700502 pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
Dan Williams33df8ca2009-01-06 11:38:15 -0700503 return -ENOMEM;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700504 }
505
506 dtc->chan = chan;
507 INIT_LIST_HEAD(&dtc->threads);
508
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700509 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
510 cnt = dmatest_add_threads(dtc, DMA_MEMCPY);
Nicolas Ferref1aef8b2009-07-06 18:19:44 +0200511 thread_count += cnt > 0 ? cnt : 0;
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700512 }
513 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
514 cnt = dmatest_add_threads(dtc, DMA_XOR);
Nicolas Ferref1aef8b2009-07-06 18:19:44 +0200515 thread_count += cnt > 0 ? cnt : 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700516 }
517
Dan Williamsb54d5cb2009-03-25 09:13:25 -0700518 pr_info("dmatest: Started %u threads using %s\n",
519 thread_count, dma_chan_name(chan));
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700520
521 list_add_tail(&dtc->node, &dmatest_channels);
522 nr_channels++;
523
Dan Williams33df8ca2009-01-06 11:38:15 -0700524 return 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700525}
526
Dan Williams7dd60252009-01-06 11:38:19 -0700527static bool filter(struct dma_chan *chan, void *param)
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700528{
Dan Williams33df8ca2009-01-06 11:38:15 -0700529 if (!dmatest_match_channel(chan) || !dmatest_match_device(chan->device))
Dan Williams7dd60252009-01-06 11:38:19 -0700530 return false;
Dan Williams33df8ca2009-01-06 11:38:15 -0700531 else
Dan Williams7dd60252009-01-06 11:38:19 -0700532 return true;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700533}
534
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700535static int __init dmatest_init(void)
536{
Dan Williams33df8ca2009-01-06 11:38:15 -0700537 dma_cap_mask_t mask;
538 struct dma_chan *chan;
539 int err = 0;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700540
Dan Williams33df8ca2009-01-06 11:38:15 -0700541 dma_cap_zero(mask);
542 dma_cap_set(DMA_MEMCPY, mask);
543 for (;;) {
544 chan = dma_request_channel(mask, filter, NULL);
545 if (chan) {
546 err = dmatest_add_channel(chan);
Dan Williamsc56c81a2009-04-08 15:08:23 -0700547 if (err) {
Dan Williams33df8ca2009-01-06 11:38:15 -0700548 dma_release_channel(chan);
549 break; /* add_channel failed, punt */
550 }
551 } else
552 break; /* no more channels available */
553 if (max_channels && nr_channels >= max_channels)
554 break; /* we have all we need */
555 }
556
557 return err;
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700558}
Dan Williams33df8ca2009-01-06 11:38:15 -0700559/* when compiled-in wait for drivers to load first */
560late_initcall(dmatest_init);
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700561
562static void __exit dmatest_exit(void)
563{
Dan Williams33df8ca2009-01-06 11:38:15 -0700564 struct dmatest_chan *dtc, *_dtc;
Dan Williams7cbd4872009-03-04 16:06:03 -0700565 struct dma_chan *chan;
Dan Williams33df8ca2009-01-06 11:38:15 -0700566
567 list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) {
568 list_del(&dtc->node);
Dan Williams7cbd4872009-03-04 16:06:03 -0700569 chan = dtc->chan;
Dan Williams33df8ca2009-01-06 11:38:15 -0700570 dmatest_cleanup_channel(dtc);
571 pr_debug("dmatest: dropped channel %s\n",
Dan Williams7cbd4872009-03-04 16:06:03 -0700572 dma_chan_name(chan));
573 dma_release_channel(chan);
Dan Williams33df8ca2009-01-06 11:38:15 -0700574 }
Haavard Skinnemoen4a776f02008-07-08 11:58:45 -0700575}
576module_exit(dmatest_exit);
577
578MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
579MODULE_LICENSE("GPL v2");