Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 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> |
Alexey Dobriyan | b7f080c | 2011-06-16 11:01:34 +0000 | [diff] [blame] | 11 | #include <linux/dma-mapping.h> |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 12 | #include <linux/dmaengine.h> |
Guennadi Liakhovetski | 981ed70 | 2011-08-18 16:50:51 +0200 | [diff] [blame] | 13 | #include <linux/freezer.h> |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 14 | #include <linux/init.h> |
| 15 | #include <linux/kthread.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/moduleparam.h> |
| 18 | #include <linux/random.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 20 | #include <linux/wait.h> |
| 21 | |
| 22 | static unsigned int test_buf_size = 16384; |
| 23 | module_param(test_buf_size, uint, S_IRUGO); |
| 24 | MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer"); |
| 25 | |
Kay Sievers | 06190d8 | 2008-11-11 13:12:33 -0700 | [diff] [blame] | 26 | static char test_channel[20]; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 27 | module_param_string(channel, test_channel, sizeof(test_channel), S_IRUGO); |
| 28 | MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)"); |
| 29 | |
Kay Sievers | 06190d8 | 2008-11-11 13:12:33 -0700 | [diff] [blame] | 30 | static char test_device[20]; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 31 | module_param_string(device, test_device, sizeof(test_device), S_IRUGO); |
| 32 | MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)"); |
| 33 | |
| 34 | static unsigned int threads_per_chan = 1; |
| 35 | module_param(threads_per_chan, uint, S_IRUGO); |
| 36 | MODULE_PARM_DESC(threads_per_chan, |
| 37 | "Number of threads to start per channel (default: 1)"); |
| 38 | |
| 39 | static unsigned int max_channels; |
| 40 | module_param(max_channels, uint, S_IRUGO); |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 41 | MODULE_PARM_DESC(max_channels, |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 42 | "Maximum number of channels to use (default: all)"); |
| 43 | |
Nicolas Ferre | 0a2ff57d | 2009-07-03 19:26:51 +0200 | [diff] [blame] | 44 | static unsigned int iterations; |
| 45 | module_param(iterations, uint, S_IRUGO); |
| 46 | MODULE_PARM_DESC(iterations, |
| 47 | "Iterations before stopping test (default: infinite)"); |
| 48 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 49 | static unsigned int xor_sources = 3; |
| 50 | module_param(xor_sources, uint, S_IRUGO); |
| 51 | MODULE_PARM_DESC(xor_sources, |
| 52 | "Number of xor source buffers (default: 3)"); |
| 53 | |
Dan Williams | 58691d6 | 2009-08-29 19:09:27 -0700 | [diff] [blame] | 54 | static unsigned int pq_sources = 3; |
| 55 | module_param(pq_sources, uint, S_IRUGO); |
| 56 | MODULE_PARM_DESC(pq_sources, |
| 57 | "Number of p+q source buffers (default: 3)"); |
| 58 | |
Viresh Kumar | d42efe6 | 2011-03-22 17:27:25 +0530 | [diff] [blame] | 59 | static int timeout = 3000; |
| 60 | module_param(timeout, uint, S_IRUGO); |
Joe Perches | 85ee7a1 | 2011-04-23 20:38:19 -0700 | [diff] [blame] | 61 | MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), " |
| 62 | "Pass -1 for infinite timeout"); |
Viresh Kumar | d42efe6 | 2011-03-22 17:27:25 +0530 | [diff] [blame] | 63 | |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 64 | /* |
| 65 | * Initialization patterns. All bytes in the source buffer has bit 7 |
| 66 | * set, all bytes in the destination buffer has bit 7 cleared. |
| 67 | * |
| 68 | * Bit 6 is set for all bytes which are to be copied by the DMA |
| 69 | * engine. Bit 5 is set for all bytes which are to be overwritten by |
| 70 | * the DMA engine. |
| 71 | * |
| 72 | * The remaining bits are the inverse of a counter which increments by |
| 73 | * one for each byte address. |
| 74 | */ |
| 75 | #define PATTERN_SRC 0x80 |
| 76 | #define PATTERN_DST 0x00 |
| 77 | #define PATTERN_COPY 0x40 |
| 78 | #define PATTERN_OVERWRITE 0x20 |
| 79 | #define PATTERN_COUNT_MASK 0x1f |
| 80 | |
| 81 | struct dmatest_thread { |
| 82 | struct list_head node; |
| 83 | struct task_struct *task; |
| 84 | struct dma_chan *chan; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 85 | u8 **srcs; |
| 86 | u8 **dsts; |
| 87 | enum dma_transaction_type type; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 88 | }; |
| 89 | |
| 90 | struct dmatest_chan { |
| 91 | struct list_head node; |
| 92 | struct dma_chan *chan; |
| 93 | struct list_head threads; |
| 94 | }; |
| 95 | |
| 96 | /* |
| 97 | * These are protected by dma_list_mutex since they're only used by |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 98 | * the DMA filter function callback |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 99 | */ |
| 100 | static LIST_HEAD(dmatest_channels); |
| 101 | static unsigned int nr_channels; |
| 102 | |
| 103 | static bool dmatest_match_channel(struct dma_chan *chan) |
| 104 | { |
| 105 | if (test_channel[0] == '\0') |
| 106 | return true; |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 107 | return strcmp(dma_chan_name(chan), test_channel) == 0; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | static bool dmatest_match_device(struct dma_device *device) |
| 111 | { |
| 112 | if (test_device[0] == '\0') |
| 113 | return true; |
Kay Sievers | 06190d8 | 2008-11-11 13:12:33 -0700 | [diff] [blame] | 114 | return strcmp(dev_name(device->dev), test_device) == 0; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | static unsigned long dmatest_random(void) |
| 118 | { |
| 119 | unsigned long buf; |
| 120 | |
| 121 | get_random_bytes(&buf, sizeof(buf)); |
| 122 | return buf; |
| 123 | } |
| 124 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 125 | static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len) |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 126 | { |
| 127 | unsigned int i; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 128 | u8 *buf; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 129 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 130 | for (; (buf = *bufs); bufs++) { |
| 131 | for (i = 0; i < start; i++) |
| 132 | buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK); |
| 133 | for ( ; i < start + len; i++) |
| 134 | buf[i] = PATTERN_SRC | PATTERN_COPY |
Joe Perches | c019894 | 2009-06-28 09:26:21 -0700 | [diff] [blame] | 135 | | (~i & PATTERN_COUNT_MASK); |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 136 | for ( ; i < test_buf_size; i++) |
| 137 | buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK); |
| 138 | buf++; |
| 139 | } |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 142 | static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len) |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 143 | { |
| 144 | unsigned int i; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 145 | u8 *buf; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 146 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 147 | for (; (buf = *bufs); bufs++) { |
| 148 | for (i = 0; i < start; i++) |
| 149 | buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK); |
| 150 | for ( ; i < start + len; i++) |
| 151 | buf[i] = PATTERN_DST | PATTERN_OVERWRITE |
| 152 | | (~i & PATTERN_COUNT_MASK); |
| 153 | for ( ; i < test_buf_size; i++) |
| 154 | buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK); |
| 155 | } |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index, |
| 159 | unsigned int counter, bool is_srcbuf) |
| 160 | { |
| 161 | u8 diff = actual ^ pattern; |
| 162 | u8 expected = pattern | (~counter & PATTERN_COUNT_MASK); |
| 163 | const char *thread_name = current->comm; |
| 164 | |
| 165 | if (is_srcbuf) |
| 166 | pr_warning("%s: srcbuf[0x%x] overwritten!" |
| 167 | " Expected %02x, got %02x\n", |
| 168 | thread_name, index, expected, actual); |
| 169 | else if ((pattern & PATTERN_COPY) |
| 170 | && (diff & (PATTERN_COPY | PATTERN_OVERWRITE))) |
| 171 | pr_warning("%s: dstbuf[0x%x] not copied!" |
| 172 | " Expected %02x, got %02x\n", |
| 173 | thread_name, index, expected, actual); |
| 174 | else if (diff & PATTERN_SRC) |
| 175 | pr_warning("%s: dstbuf[0x%x] was copied!" |
| 176 | " Expected %02x, got %02x\n", |
| 177 | thread_name, index, expected, actual); |
| 178 | else |
| 179 | pr_warning("%s: dstbuf[0x%x] mismatch!" |
| 180 | " Expected %02x, got %02x\n", |
| 181 | thread_name, index, expected, actual); |
| 182 | } |
| 183 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 184 | static unsigned int dmatest_verify(u8 **bufs, unsigned int start, |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 185 | unsigned int end, unsigned int counter, u8 pattern, |
| 186 | bool is_srcbuf) |
| 187 | { |
| 188 | unsigned int i; |
| 189 | unsigned int error_count = 0; |
| 190 | u8 actual; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 191 | u8 expected; |
| 192 | u8 *buf; |
| 193 | unsigned int counter_orig = counter; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 194 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 195 | for (; (buf = *bufs); bufs++) { |
| 196 | counter = counter_orig; |
| 197 | for (i = start; i < end; i++) { |
| 198 | actual = buf[i]; |
| 199 | expected = pattern | (~counter & PATTERN_COUNT_MASK); |
| 200 | if (actual != expected) { |
| 201 | if (error_count < 32) |
| 202 | dmatest_mismatch(actual, pattern, i, |
| 203 | counter, is_srcbuf); |
| 204 | error_count++; |
| 205 | } |
| 206 | counter++; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 207 | } |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | if (error_count > 32) |
| 211 | pr_warning("%s: %u errors suppressed\n", |
| 212 | current->comm, error_count - 32); |
| 213 | |
| 214 | return error_count; |
| 215 | } |
| 216 | |
Tejun Heo | adfa543 | 2011-11-23 09:28:16 -0800 | [diff] [blame] | 217 | /* poor man's completion - we want to use wait_event_freezable() on it */ |
| 218 | struct dmatest_done { |
| 219 | bool done; |
| 220 | wait_queue_head_t *wait; |
| 221 | }; |
| 222 | |
| 223 | static void dmatest_callback(void *arg) |
Dan Williams | e44e0aa | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 224 | { |
Tejun Heo | adfa543 | 2011-11-23 09:28:16 -0800 | [diff] [blame] | 225 | struct dmatest_done *done = arg; |
| 226 | |
| 227 | done->done = true; |
| 228 | wake_up_all(done->wait); |
Dan Williams | e44e0aa | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 231 | /* |
| 232 | * This function repeatedly tests DMA transfers of various lengths and |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 233 | * offsets for a given operation type until it is told to exit by |
| 234 | * kthread_stop(). There may be multiple threads running this function |
| 235 | * in parallel for a single channel, and there may be multiple channels |
| 236 | * being tested in parallel. |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 237 | * |
| 238 | * Before each test, the source and destination buffer is initialized |
| 239 | * with a known pattern. This pattern is different depending on |
| 240 | * whether it's in an area which is supposed to be copied or |
| 241 | * overwritten, and different in the source and destination buffers. |
| 242 | * So if the DMA engine doesn't copy exactly what we tell it to copy, |
| 243 | * we'll notice. |
| 244 | */ |
| 245 | static int dmatest_func(void *data) |
| 246 | { |
Tejun Heo | adfa543 | 2011-11-23 09:28:16 -0800 | [diff] [blame] | 247 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 248 | struct dmatest_thread *thread = data; |
Tejun Heo | adfa543 | 2011-11-23 09:28:16 -0800 | [diff] [blame] | 249 | struct dmatest_done done = { .wait = &done_wait }; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 250 | struct dma_chan *chan; |
| 251 | const char *thread_name; |
| 252 | unsigned int src_off, dst_off, len; |
| 253 | unsigned int error_count; |
| 254 | unsigned int failed_tests = 0; |
| 255 | unsigned int total_tests = 0; |
| 256 | dma_cookie_t cookie; |
| 257 | enum dma_status status; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 258 | enum dma_ctrl_flags flags; |
Anatolij Gustschin | 94de648 | 2010-02-15 22:35:23 +0100 | [diff] [blame] | 259 | u8 pq_coefs[pq_sources + 1]; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 260 | int ret; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 261 | int src_cnt; |
| 262 | int dst_cnt; |
| 263 | int i; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 264 | |
| 265 | thread_name = current->comm; |
Tejun Heo | adfa543 | 2011-11-23 09:28:16 -0800 | [diff] [blame] | 266 | set_freezable(); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 267 | |
| 268 | ret = -ENOMEM; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 269 | |
| 270 | smp_rmb(); |
| 271 | chan = thread->chan; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 272 | if (thread->type == DMA_MEMCPY) |
| 273 | src_cnt = dst_cnt = 1; |
| 274 | else if (thread->type == DMA_XOR) { |
| 275 | src_cnt = xor_sources | 1; /* force odd to ensure dst = src */ |
| 276 | dst_cnt = 1; |
Dan Williams | 58691d6 | 2009-08-29 19:09:27 -0700 | [diff] [blame] | 277 | } else if (thread->type == DMA_PQ) { |
| 278 | src_cnt = pq_sources | 1; /* force odd to ensure dst = src */ |
| 279 | dst_cnt = 2; |
Anatolij Gustschin | 94de648 | 2010-02-15 22:35:23 +0100 | [diff] [blame] | 280 | for (i = 0; i < src_cnt; i++) |
Dan Williams | 58691d6 | 2009-08-29 19:09:27 -0700 | [diff] [blame] | 281 | pq_coefs[i] = 1; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 282 | } else |
| 283 | goto err_srcs; |
| 284 | |
| 285 | thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL); |
| 286 | if (!thread->srcs) |
| 287 | goto err_srcs; |
| 288 | for (i = 0; i < src_cnt; i++) { |
| 289 | thread->srcs[i] = kmalloc(test_buf_size, GFP_KERNEL); |
| 290 | if (!thread->srcs[i]) |
| 291 | goto err_srcbuf; |
| 292 | } |
| 293 | thread->srcs[i] = NULL; |
| 294 | |
| 295 | thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL); |
| 296 | if (!thread->dsts) |
| 297 | goto err_dsts; |
| 298 | for (i = 0; i < dst_cnt; i++) { |
| 299 | thread->dsts[i] = kmalloc(test_buf_size, GFP_KERNEL); |
| 300 | if (!thread->dsts[i]) |
| 301 | goto err_dstbuf; |
| 302 | } |
| 303 | thread->dsts[i] = NULL; |
| 304 | |
Dan Williams | e44e0aa | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 305 | set_user_nice(current, 10); |
| 306 | |
Ira Snyder | b203bd3 | 2011-03-03 07:54:53 +0000 | [diff] [blame] | 307 | /* |
| 308 | * src buffers are freed by the DMAEngine code with dma_unmap_single() |
| 309 | * dst buffers are freed by ourselves below |
| 310 | */ |
| 311 | flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT |
| 312 | | DMA_COMPL_SKIP_DEST_UNMAP | DMA_COMPL_SRC_UNMAP_SINGLE; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 313 | |
Nicolas Ferre | 0a2ff57d | 2009-07-03 19:26:51 +0200 | [diff] [blame] | 314 | while (!kthread_should_stop() |
| 315 | && !(iterations && total_tests >= iterations)) { |
Atsushi Nemoto | d86be86 | 2009-01-13 09:22:20 -0700 | [diff] [blame] | 316 | struct dma_device *dev = chan->device; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 317 | struct dma_async_tx_descriptor *tx = NULL; |
| 318 | dma_addr_t dma_srcs[src_cnt]; |
| 319 | dma_addr_t dma_dsts[dst_cnt]; |
Dan Williams | 83544ae | 2009-09-08 17:42:53 -0700 | [diff] [blame] | 320 | u8 align = 0; |
Atsushi Nemoto | d86be86 | 2009-01-13 09:22:20 -0700 | [diff] [blame] | 321 | |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 322 | total_tests++; |
| 323 | |
Dan Williams | 83544ae | 2009-09-08 17:42:53 -0700 | [diff] [blame] | 324 | /* honor alignment restrictions */ |
| 325 | if (thread->type == DMA_MEMCPY) |
| 326 | align = dev->copy_align; |
| 327 | else if (thread->type == DMA_XOR) |
| 328 | align = dev->xor_align; |
| 329 | else if (thread->type == DMA_PQ) |
| 330 | align = dev->pq_align; |
| 331 | |
Guennadi Liakhovetski | cfe4f27 | 2009-12-04 19:44:48 +0100 | [diff] [blame] | 332 | if (1 << align > test_buf_size) { |
| 333 | pr_err("%u-byte buffer too small for %d-byte alignment\n", |
| 334 | test_buf_size, 1 << align); |
| 335 | break; |
| 336 | } |
| 337 | |
| 338 | len = dmatest_random() % test_buf_size + 1; |
Dan Williams | 83544ae | 2009-09-08 17:42:53 -0700 | [diff] [blame] | 339 | len = (len >> align) << align; |
Guennadi Liakhovetski | cfe4f27 | 2009-12-04 19:44:48 +0100 | [diff] [blame] | 340 | if (!len) |
| 341 | len = 1 << align; |
| 342 | src_off = dmatest_random() % (test_buf_size - len + 1); |
| 343 | dst_off = dmatest_random() % (test_buf_size - len + 1); |
| 344 | |
Dan Williams | 83544ae | 2009-09-08 17:42:53 -0700 | [diff] [blame] | 345 | src_off = (src_off >> align) << align; |
| 346 | dst_off = (dst_off >> align) << align; |
| 347 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 348 | dmatest_init_srcs(thread->srcs, src_off, len); |
| 349 | dmatest_init_dsts(thread->dsts, dst_off, len); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 350 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 351 | for (i = 0; i < src_cnt; i++) { |
| 352 | u8 *buf = thread->srcs[i] + src_off; |
| 353 | |
| 354 | dma_srcs[i] = dma_map_single(dev->dev, buf, len, |
| 355 | DMA_TO_DEVICE); |
| 356 | } |
Atsushi Nemoto | d86be86 | 2009-01-13 09:22:20 -0700 | [diff] [blame] | 357 | /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */ |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 358 | for (i = 0; i < dst_cnt; i++) { |
| 359 | dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i], |
| 360 | test_buf_size, |
| 361 | DMA_BIDIRECTIONAL); |
| 362 | } |
Atsushi Nemoto | d86be86 | 2009-01-13 09:22:20 -0700 | [diff] [blame] | 363 | |
Dan Williams | 83544ae | 2009-09-08 17:42:53 -0700 | [diff] [blame] | 364 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 365 | if (thread->type == DMA_MEMCPY) |
| 366 | tx = dev->device_prep_dma_memcpy(chan, |
| 367 | dma_dsts[0] + dst_off, |
| 368 | dma_srcs[0], len, |
| 369 | flags); |
| 370 | else if (thread->type == DMA_XOR) |
| 371 | tx = dev->device_prep_dma_xor(chan, |
| 372 | dma_dsts[0] + dst_off, |
Dan Williams | 67b9124 | 2010-02-28 22:20:18 -0700 | [diff] [blame] | 373 | dma_srcs, src_cnt, |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 374 | len, flags); |
Dan Williams | 58691d6 | 2009-08-29 19:09:27 -0700 | [diff] [blame] | 375 | else if (thread->type == DMA_PQ) { |
| 376 | dma_addr_t dma_pq[dst_cnt]; |
| 377 | |
| 378 | for (i = 0; i < dst_cnt; i++) |
| 379 | dma_pq[i] = dma_dsts[i] + dst_off; |
| 380 | tx = dev->device_prep_dma_pq(chan, dma_pq, dma_srcs, |
Anatolij Gustschin | 94de648 | 2010-02-15 22:35:23 +0100 | [diff] [blame] | 381 | src_cnt, pq_coefs, |
Dan Williams | 58691d6 | 2009-08-29 19:09:27 -0700 | [diff] [blame] | 382 | len, flags); |
| 383 | } |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 384 | |
Atsushi Nemoto | d86be86 | 2009-01-13 09:22:20 -0700 | [diff] [blame] | 385 | if (!tx) { |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 386 | for (i = 0; i < src_cnt; i++) |
| 387 | dma_unmap_single(dev->dev, dma_srcs[i], len, |
| 388 | DMA_TO_DEVICE); |
| 389 | for (i = 0; i < dst_cnt; i++) |
| 390 | dma_unmap_single(dev->dev, dma_dsts[i], |
| 391 | test_buf_size, |
| 392 | DMA_BIDIRECTIONAL); |
Atsushi Nemoto | d86be86 | 2009-01-13 09:22:20 -0700 | [diff] [blame] | 393 | pr_warning("%s: #%u: prep error with src_off=0x%x " |
| 394 | "dst_off=0x%x len=0x%x\n", |
| 395 | thread_name, total_tests - 1, |
| 396 | src_off, dst_off, len); |
| 397 | msleep(100); |
| 398 | failed_tests++; |
| 399 | continue; |
| 400 | } |
Dan Williams | e44e0aa | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 401 | |
Tejun Heo | adfa543 | 2011-11-23 09:28:16 -0800 | [diff] [blame] | 402 | done.done = false; |
Dan Williams | e44e0aa | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 403 | tx->callback = dmatest_callback; |
Tejun Heo | adfa543 | 2011-11-23 09:28:16 -0800 | [diff] [blame] | 404 | tx->callback_param = &done; |
Atsushi Nemoto | d86be86 | 2009-01-13 09:22:20 -0700 | [diff] [blame] | 405 | cookie = tx->tx_submit(tx); |
| 406 | |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 407 | if (dma_submit_error(cookie)) { |
| 408 | pr_warning("%s: #%u: submit error %d with src_off=0x%x " |
| 409 | "dst_off=0x%x len=0x%x\n", |
| 410 | thread_name, total_tests - 1, cookie, |
| 411 | src_off, dst_off, len); |
| 412 | msleep(100); |
| 413 | failed_tests++; |
| 414 | continue; |
| 415 | } |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 416 | dma_async_issue_pending(chan); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 417 | |
Tejun Heo | adfa543 | 2011-11-23 09:28:16 -0800 | [diff] [blame] | 418 | wait_event_freezable_timeout(done_wait, done.done, |
| 419 | msecs_to_jiffies(timeout)); |
Guennadi Liakhovetski | 981ed70 | 2011-08-18 16:50:51 +0200 | [diff] [blame] | 420 | |
Dan Williams | e44e0aa | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 421 | status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 422 | |
Tejun Heo | adfa543 | 2011-11-23 09:28:16 -0800 | [diff] [blame] | 423 | if (!done.done) { |
| 424 | /* |
| 425 | * We're leaving the timed out dma operation with |
| 426 | * dangling pointer to done_wait. To make this |
| 427 | * correct, we'll need to allocate wait_done for |
| 428 | * each test iteration and perform "who's gonna |
| 429 | * free it this time?" dancing. For now, just |
| 430 | * leave it dangling. |
| 431 | */ |
Dan Williams | e44e0aa | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 432 | pr_warning("%s: #%u: test timed out\n", |
| 433 | thread_name, total_tests - 1); |
| 434 | failed_tests++; |
| 435 | continue; |
| 436 | } else if (status != DMA_SUCCESS) { |
| 437 | pr_warning("%s: #%u: got completion callback," |
| 438 | " but status is \'%s\'\n", |
| 439 | thread_name, total_tests - 1, |
| 440 | status == DMA_ERROR ? "error" : "in progress"); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 441 | failed_tests++; |
| 442 | continue; |
| 443 | } |
Dan Williams | e44e0aa | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 444 | |
Atsushi Nemoto | d86be86 | 2009-01-13 09:22:20 -0700 | [diff] [blame] | 445 | /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */ |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 446 | for (i = 0; i < dst_cnt; i++) |
| 447 | dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size, |
| 448 | DMA_BIDIRECTIONAL); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 449 | |
| 450 | error_count = 0; |
| 451 | |
| 452 | pr_debug("%s: verifying source buffer...\n", thread_name); |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 453 | error_count += dmatest_verify(thread->srcs, 0, src_off, |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 454 | 0, PATTERN_SRC, true); |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 455 | error_count += dmatest_verify(thread->srcs, src_off, |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 456 | src_off + len, src_off, |
| 457 | PATTERN_SRC | PATTERN_COPY, true); |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 458 | error_count += dmatest_verify(thread->srcs, src_off + len, |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 459 | test_buf_size, src_off + len, |
| 460 | PATTERN_SRC, true); |
| 461 | |
| 462 | pr_debug("%s: verifying dest buffer...\n", |
| 463 | thread->task->comm); |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 464 | error_count += dmatest_verify(thread->dsts, 0, dst_off, |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 465 | 0, PATTERN_DST, false); |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 466 | error_count += dmatest_verify(thread->dsts, dst_off, |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 467 | dst_off + len, src_off, |
| 468 | PATTERN_SRC | PATTERN_COPY, false); |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 469 | error_count += dmatest_verify(thread->dsts, dst_off + len, |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 470 | test_buf_size, dst_off + len, |
| 471 | PATTERN_DST, false); |
| 472 | |
| 473 | if (error_count) { |
| 474 | pr_warning("%s: #%u: %u errors with " |
| 475 | "src_off=0x%x dst_off=0x%x len=0x%x\n", |
| 476 | thread_name, total_tests - 1, error_count, |
| 477 | src_off, dst_off, len); |
| 478 | failed_tests++; |
| 479 | } else { |
| 480 | pr_debug("%s: #%u: No errors with " |
| 481 | "src_off=0x%x dst_off=0x%x len=0x%x\n", |
| 482 | thread_name, total_tests - 1, |
| 483 | src_off, dst_off, len); |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | ret = 0; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 488 | for (i = 0; thread->dsts[i]; i++) |
| 489 | kfree(thread->dsts[i]); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 490 | err_dstbuf: |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 491 | kfree(thread->dsts); |
| 492 | err_dsts: |
| 493 | for (i = 0; thread->srcs[i]; i++) |
| 494 | kfree(thread->srcs[i]); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 495 | err_srcbuf: |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 496 | kfree(thread->srcs); |
| 497 | err_srcs: |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 498 | pr_notice("%s: terminating after %u tests, %u failures (status %d)\n", |
| 499 | thread_name, total_tests, failed_tests, ret); |
Nicolas Ferre | 0a2ff57d | 2009-07-03 19:26:51 +0200 | [diff] [blame] | 500 | |
Viresh Kumar | 9704efa | 2011-07-29 16:21:57 +0530 | [diff] [blame] | 501 | /* terminate all transfers on specified channels */ |
| 502 | chan->device->device_control(chan, DMA_TERMINATE_ALL, 0); |
Nicolas Ferre | 0a2ff57d | 2009-07-03 19:26:51 +0200 | [diff] [blame] | 503 | if (iterations > 0) |
| 504 | while (!kthread_should_stop()) { |
Yong Zhang | b953df7 | 2010-02-05 21:52:37 +0800 | [diff] [blame] | 505 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit); |
Nicolas Ferre | 0a2ff57d | 2009-07-03 19:26:51 +0200 | [diff] [blame] | 506 | interruptible_sleep_on(&wait_dmatest_exit); |
| 507 | } |
| 508 | |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 509 | return ret; |
| 510 | } |
| 511 | |
| 512 | static void dmatest_cleanup_channel(struct dmatest_chan *dtc) |
| 513 | { |
| 514 | struct dmatest_thread *thread; |
| 515 | struct dmatest_thread *_thread; |
| 516 | int ret; |
| 517 | |
| 518 | list_for_each_entry_safe(thread, _thread, &dtc->threads, node) { |
| 519 | ret = kthread_stop(thread->task); |
| 520 | pr_debug("dmatest: thread %s exited with status %d\n", |
| 521 | thread->task->comm, ret); |
| 522 | list_del(&thread->node); |
| 523 | kfree(thread); |
| 524 | } |
Viresh Kumar | 9704efa | 2011-07-29 16:21:57 +0530 | [diff] [blame] | 525 | |
| 526 | /* terminate all transfers on specified channels */ |
| 527 | dtc->chan->device->device_control(dtc->chan, DMA_TERMINATE_ALL, 0); |
| 528 | |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 529 | kfree(dtc); |
| 530 | } |
| 531 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 532 | static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_type type) |
| 533 | { |
| 534 | struct dmatest_thread *thread; |
| 535 | struct dma_chan *chan = dtc->chan; |
| 536 | char *op; |
| 537 | unsigned int i; |
| 538 | |
| 539 | if (type == DMA_MEMCPY) |
| 540 | op = "copy"; |
| 541 | else if (type == DMA_XOR) |
| 542 | op = "xor"; |
Dan Williams | 58691d6 | 2009-08-29 19:09:27 -0700 | [diff] [blame] | 543 | else if (type == DMA_PQ) |
| 544 | op = "pq"; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 545 | else |
| 546 | return -EINVAL; |
| 547 | |
| 548 | for (i = 0; i < threads_per_chan; i++) { |
| 549 | thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL); |
| 550 | if (!thread) { |
| 551 | pr_warning("dmatest: No memory for %s-%s%u\n", |
| 552 | dma_chan_name(chan), op, i); |
| 553 | |
| 554 | break; |
| 555 | } |
| 556 | thread->chan = dtc->chan; |
| 557 | thread->type = type; |
| 558 | smp_wmb(); |
| 559 | thread->task = kthread_run(dmatest_func, thread, "%s-%s%u", |
| 560 | dma_chan_name(chan), op, i); |
| 561 | if (IS_ERR(thread->task)) { |
| 562 | pr_warning("dmatest: Failed to run thread %s-%s%u\n", |
| 563 | dma_chan_name(chan), op, i); |
| 564 | kfree(thread); |
| 565 | break; |
| 566 | } |
| 567 | |
| 568 | /* srcbuf and dstbuf are allocated by the thread itself */ |
| 569 | |
| 570 | list_add_tail(&thread->node, &dtc->threads); |
| 571 | } |
| 572 | |
| 573 | return i; |
| 574 | } |
| 575 | |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 576 | static int dmatest_add_channel(struct dma_chan *chan) |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 577 | { |
| 578 | struct dmatest_chan *dtc; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 579 | struct dma_device *dma_dev = chan->device; |
| 580 | unsigned int thread_count = 0; |
Kulikov Vasiliy | b9033e6 | 2010-07-17 19:19:48 +0400 | [diff] [blame] | 581 | int cnt; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 582 | |
Andrew Morton | 6fdb8bd | 2008-09-19 04:16:23 -0700 | [diff] [blame] | 583 | dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 584 | if (!dtc) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 585 | pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan)); |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 586 | return -ENOMEM; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 587 | } |
| 588 | |
| 589 | dtc->chan = chan; |
| 590 | INIT_LIST_HEAD(&dtc->threads); |
| 591 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 592 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { |
| 593 | cnt = dmatest_add_threads(dtc, DMA_MEMCPY); |
Nicolas Ferre | f1aef8b | 2009-07-06 18:19:44 +0200 | [diff] [blame] | 594 | thread_count += cnt > 0 ? cnt : 0; |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 595 | } |
| 596 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { |
| 597 | cnt = dmatest_add_threads(dtc, DMA_XOR); |
Nicolas Ferre | f1aef8b | 2009-07-06 18:19:44 +0200 | [diff] [blame] | 598 | thread_count += cnt > 0 ? cnt : 0; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 599 | } |
Dan Williams | 58691d6 | 2009-08-29 19:09:27 -0700 | [diff] [blame] | 600 | if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { |
| 601 | cnt = dmatest_add_threads(dtc, DMA_PQ); |
| 602 | thread_count += cnt > 0 ?: 0; |
| 603 | } |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 604 | |
Dan Williams | b54d5cb | 2009-03-25 09:13:25 -0700 | [diff] [blame] | 605 | pr_info("dmatest: Started %u threads using %s\n", |
| 606 | thread_count, dma_chan_name(chan)); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 607 | |
| 608 | list_add_tail(&dtc->node, &dmatest_channels); |
| 609 | nr_channels++; |
| 610 | |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 611 | return 0; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 612 | } |
| 613 | |
Dan Williams | 7dd6025 | 2009-01-06 11:38:19 -0700 | [diff] [blame] | 614 | static bool filter(struct dma_chan *chan, void *param) |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 615 | { |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 616 | if (!dmatest_match_channel(chan) || !dmatest_match_device(chan->device)) |
Dan Williams | 7dd6025 | 2009-01-06 11:38:19 -0700 | [diff] [blame] | 617 | return false; |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 618 | else |
Dan Williams | 7dd6025 | 2009-01-06 11:38:19 -0700 | [diff] [blame] | 619 | return true; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 620 | } |
| 621 | |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 622 | static int __init dmatest_init(void) |
| 623 | { |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 624 | dma_cap_mask_t mask; |
| 625 | struct dma_chan *chan; |
| 626 | int err = 0; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 627 | |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 628 | dma_cap_zero(mask); |
| 629 | dma_cap_set(DMA_MEMCPY, mask); |
| 630 | for (;;) { |
| 631 | chan = dma_request_channel(mask, filter, NULL); |
| 632 | if (chan) { |
| 633 | err = dmatest_add_channel(chan); |
Dan Williams | c56c81a | 2009-04-08 15:08:23 -0700 | [diff] [blame] | 634 | if (err) { |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 635 | dma_release_channel(chan); |
| 636 | break; /* add_channel failed, punt */ |
| 637 | } |
| 638 | } else |
| 639 | break; /* no more channels available */ |
| 640 | if (max_channels && nr_channels >= max_channels) |
| 641 | break; /* we have all we need */ |
| 642 | } |
| 643 | |
| 644 | return err; |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 645 | } |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 646 | /* when compiled-in wait for drivers to load first */ |
| 647 | late_initcall(dmatest_init); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 648 | |
| 649 | static void __exit dmatest_exit(void) |
| 650 | { |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 651 | struct dmatest_chan *dtc, *_dtc; |
Dan Williams | 7cbd487 | 2009-03-04 16:06:03 -0700 | [diff] [blame] | 652 | struct dma_chan *chan; |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 653 | |
| 654 | list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) { |
| 655 | list_del(&dtc->node); |
Dan Williams | 7cbd487 | 2009-03-04 16:06:03 -0700 | [diff] [blame] | 656 | chan = dtc->chan; |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 657 | dmatest_cleanup_channel(dtc); |
| 658 | pr_debug("dmatest: dropped channel %s\n", |
Dan Williams | 7cbd487 | 2009-03-04 16:06:03 -0700 | [diff] [blame] | 659 | dma_chan_name(chan)); |
| 660 | dma_release_channel(chan); |
Dan Williams | 33df8ca | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 661 | } |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 662 | } |
| 663 | module_exit(dmatest_exit); |
| 664 | |
Jean Delvare | e05503e | 2011-05-18 16:49:24 +0200 | [diff] [blame] | 665 | MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); |
Haavard Skinnemoen | 4a776f0 | 2008-07-08 11:58:45 -0700 | [diff] [blame] | 666 | MODULE_LICENSE("GPL v2"); |