1/* 2 * DMA Engine test module 3 * 4 * Copyright (C) 2007 Atmel Corporation 5 * Copyright (C) 2013 Intel Corporation 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13#include <linux/delay.h> 14#include <linux/dma-mapping.h> 15#include <linux/dmaengine.h> 16#include <linux/freezer.h> 17#include <linux/init.h> 18#include <linux/kthread.h> 19#include <linux/module.h> 20#include <linux/moduleparam.h> 21#include <linux/random.h> 22#include <linux/slab.h> 23#include <linux/wait.h> 24 25static unsigned int test_buf_size = 16384; 26module_param(test_buf_size, uint, S_IRUGO | S_IWUSR); 27MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer"); 28 29static char test_channel[20]; 30module_param_string(channel, test_channel, sizeof(test_channel), 31 S_IRUGO | S_IWUSR); 32MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)"); 33 34static char test_device[32]; 35module_param_string(device, test_device, sizeof(test_device), 36 S_IRUGO | S_IWUSR); 37MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)"); 38 39static unsigned int threads_per_chan = 1; 40module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR); 41MODULE_PARM_DESC(threads_per_chan, 42 "Number of threads to start per channel (default: 1)"); 43 44static unsigned int max_channels; 45module_param(max_channels, uint, S_IRUGO | S_IWUSR); 46MODULE_PARM_DESC(max_channels, 47 "Maximum number of channels to use (default: all)"); 48 49static unsigned int iterations; 50module_param(iterations, uint, S_IRUGO | S_IWUSR); 51MODULE_PARM_DESC(iterations, 52 "Iterations before stopping test (default: infinite)"); 53 54static unsigned int xor_sources = 3; 55module_param(xor_sources, uint, S_IRUGO | S_IWUSR); 56MODULE_PARM_DESC(xor_sources, 57 "Number of xor source buffers (default: 3)"); 58 59static unsigned int pq_sources = 3; 60module_param(pq_sources, uint, S_IRUGO | S_IWUSR); 61MODULE_PARM_DESC(pq_sources, 62 "Number of p+q source buffers (default: 3)"); 63 64static int timeout = 3000; 65module_param(timeout, uint, S_IRUGO | S_IWUSR); 66MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), " 67 "Pass -1 for infinite timeout"); 68 69static bool noverify; 70module_param(noverify, bool, S_IRUGO | S_IWUSR); 71MODULE_PARM_DESC(noverify, "Disable random data setup and verification"); 72 73static bool verbose; 74module_param(verbose, bool, S_IRUGO | S_IWUSR); 75MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)"); 76 77/** 78 * struct dmatest_params - test parameters. 79 * @buf_size: size of the memcpy test buffer 80 * @channel: bus ID of the channel to test 81 * @device: bus ID of the DMA Engine to test 82 * @threads_per_chan: number of threads to start per channel 83 * @max_channels: maximum number of channels to use 84 * @iterations: iterations before stopping test 85 * @xor_sources: number of xor source buffers 86 * @pq_sources: number of p+q source buffers 87 * @timeout: transfer timeout in msec, -1 for infinite timeout 88 */ 89struct dmatest_params { 90 unsigned int buf_size; 91 char channel[20]; 92 char device[32]; 93 unsigned int threads_per_chan; 94 unsigned int max_channels; 95 unsigned int iterations; 96 unsigned int xor_sources; 97 unsigned int pq_sources; 98 int timeout; 99 bool noverify; 100}; 101 102/** 103 * struct dmatest_info - test information. 104 * @params: test parameters 105 * @lock: access protection to the fields of this structure 106 */ 107static struct dmatest_info { 108 /* Test parameters */ 109 struct dmatest_params params; 110 111 /* Internal state */ 112 struct list_head channels; 113 unsigned int nr_channels; 114 struct mutex lock; 115 bool did_init; 116} test_info = { 117 .channels = LIST_HEAD_INIT(test_info.channels), 118 .lock = __MUTEX_INITIALIZER(test_info.lock), 119}; 120 121static int dmatest_run_set(const char *val, const struct kernel_param *kp); 122static int dmatest_run_get(char *val, const struct kernel_param *kp); 123static struct kernel_param_ops run_ops = { 124 .set = dmatest_run_set, 125 .get = dmatest_run_get, 126}; 127static bool dmatest_run; 128module_param_cb(run, &run_ops, &dmatest_run, S_IRUGO | S_IWUSR); 129MODULE_PARM_DESC(run, "Run the test (default: false)"); 130 131/* Maximum amount of mismatched bytes in buffer to print */ 132#define MAX_ERROR_COUNT 32 133 134/* 135 * Initialization patterns. All bytes in the source buffer has bit 7 136 * set, all bytes in the destination buffer has bit 7 cleared. 137 * 138 * Bit 6 is set for all bytes which are to be copied by the DMA 139 * engine. Bit 5 is set for all bytes which are to be overwritten by 140 * the DMA engine. 141 * 142 * The remaining bits are the inverse of a counter which increments by 143 * one for each byte address. 144 */ 145#define PATTERN_SRC 0x80 146#define PATTERN_DST 0x00 147#define PATTERN_COPY 0x40 148#define PATTERN_OVERWRITE 0x20 149#define PATTERN_COUNT_MASK 0x1f 150 151struct dmatest_thread { 152 struct list_head node; 153 struct dmatest_info *info; 154 struct task_struct *task; 155 struct dma_chan *chan; 156 u8 **srcs; 157 u8 **dsts; 158 enum dma_transaction_type type; 159 bool done; 160}; 161 162struct dmatest_chan { 163 struct list_head node; 164 struct dma_chan *chan; 165 struct list_head threads; 166}; 167 168static DECLARE_WAIT_QUEUE_HEAD(thread_wait); 169static bool wait; 170 171static bool is_threaded_test_run(struct dmatest_info *info) 172{ 173 struct dmatest_chan *dtc; 174 175 list_for_each_entry(dtc, &info->channels, node) { 176 struct dmatest_thread *thread; 177 178 list_for_each_entry(thread, &dtc->threads, node) { 179 if (!thread->done) 180 return true; 181 } 182 } 183 184 return false; 185} 186 187static int dmatest_wait_get(char *val, const struct kernel_param *kp) 188{ 189 struct dmatest_info *info = &test_info; 190 struct dmatest_params *params = &info->params; 191 192 if (params->iterations) 193 wait_event(thread_wait, !is_threaded_test_run(info)); 194 wait = true; 195 return param_get_bool(val, kp); 196} 197 198static struct kernel_param_ops wait_ops = { 199 .get = dmatest_wait_get, 200 .set = param_set_bool, 201}; 202module_param_cb(wait, &wait_ops, &wait, S_IRUGO); 203MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)"); 204 205static bool dmatest_match_channel(struct dmatest_params *params, 206 struct dma_chan *chan) 207{ 208 if (params->channel[0] == '\0') 209 return true; 210 return strcmp(dma_chan_name(chan), params->channel) == 0; 211} 212 213static bool dmatest_match_device(struct dmatest_params *params, 214 struct dma_device *device) 215{ 216 if (params->device[0] == '\0') 217 return true; 218 return strcmp(dev_name(device->dev), params->device) == 0; 219} 220 221static unsigned long dmatest_random(void) 222{ 223 unsigned long buf; 224 225 prandom_bytes(&buf, sizeof(buf)); 226 return buf; 227} 228 229static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len, 230 unsigned int buf_size) 231{ 232 unsigned int i; 233 u8 *buf; 234 235 for (; (buf = *bufs); bufs++) { 236 for (i = 0; i < start; i++) 237 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK); 238 for ( ; i < start + len; i++) 239 buf[i] = PATTERN_SRC | PATTERN_COPY 240 | (~i & PATTERN_COUNT_MASK); 241 for ( ; i < buf_size; i++) 242 buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK); 243 buf++; 244 } 245} 246 247static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len, 248 unsigned int buf_size) 249{ 250 unsigned int i; 251 u8 *buf; 252 253 for (; (buf = *bufs); bufs++) { 254 for (i = 0; i < start; i++) 255 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK); 256 for ( ; i < start + len; i++) 257 buf[i] = PATTERN_DST | PATTERN_OVERWRITE 258 | (~i & PATTERN_COUNT_MASK); 259 for ( ; i < buf_size; i++) 260 buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK); 261 } 262} 263 264static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index, 265 unsigned int counter, bool is_srcbuf) 266{ 267 u8 diff = actual ^ pattern; 268 u8 expected = pattern | (~counter & PATTERN_COUNT_MASK); 269 const char *thread_name = current->comm; 270 271 if (is_srcbuf) 272 pr_warn("%s: srcbuf[0x%x] overwritten! Expected %02x, got %02x\n", 273 thread_name, index, expected, actual); 274 else if ((pattern & PATTERN_COPY) 275 && (diff & (PATTERN_COPY | PATTERN_OVERWRITE))) 276 pr_warn("%s: dstbuf[0x%x] not copied! Expected %02x, got %02x\n", 277 thread_name, index, expected, actual); 278 else if (diff & PATTERN_SRC) 279 pr_warn("%s: dstbuf[0x%x] was copied! Expected %02x, got %02x\n", 280 thread_name, index, expected, actual); 281 else 282 pr_warn("%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n", 283 thread_name, index, expected, actual); 284} 285 286static unsigned int dmatest_verify(u8 **bufs, unsigned int start, 287 unsigned int end, unsigned int counter, u8 pattern, 288 bool is_srcbuf) 289{ 290 unsigned int i; 291 unsigned int error_count = 0; 292 u8 actual; 293 u8 expected; 294 u8 *buf; 295 unsigned int counter_orig = counter; 296 297 for (; (buf = *bufs); bufs++) { 298 counter = counter_orig; 299 for (i = start; i < end; i++) { 300 actual = buf[i]; 301 expected = pattern | (~counter & PATTERN_COUNT_MASK); 302 if (actual != expected) { 303 if (error_count < MAX_ERROR_COUNT) 304 dmatest_mismatch(actual, pattern, i, 305 counter, is_srcbuf); 306 error_count++; 307 } 308 counter++; 309 } 310 } 311 312 if (error_count > MAX_ERROR_COUNT) 313 pr_warn("%s: %u errors suppressed\n", 314 current->comm, error_count - MAX_ERROR_COUNT); 315 316 return error_count; 317} 318 319/* poor man's completion - we want to use wait_event_freezable() on it */ 320struct dmatest_done { 321 bool done; 322 wait_queue_head_t *wait; 323}; 324 325static void dmatest_callback(void *arg) 326{ 327 struct dmatest_done *done = arg; 328 329 done->done = true; 330 wake_up_all(done->wait); 331} 332 333static unsigned int min_odd(unsigned int x, unsigned int y) 334{ 335 unsigned int val = min(x, y); 336 337 return val % 2 ? val : val - 1; 338} 339 340static void result(const char *err, unsigned int n, unsigned int src_off, 341 unsigned int dst_off, unsigned int len, unsigned long data) 342{ 343 pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n", 344 current->comm, n, err, src_off, dst_off, len, data); 345} 346 347static void dbg_result(const char *err, unsigned int n, unsigned int src_off, 348 unsigned int dst_off, unsigned int len, 349 unsigned long data) 350{ 351 pr_debug("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n", 352 current->comm, n, err, src_off, dst_off, len, data); 353} 354 355#define verbose_result(err, n, src_off, dst_off, len, data) ({ \ 356 if (verbose) \ 357 result(err, n, src_off, dst_off, len, data); \ 358 else \ 359 dbg_result(err, n, src_off, dst_off, len, data);\ 360}) 361 362static unsigned long long dmatest_persec(s64 runtime, unsigned int val) 363{ 364 unsigned long long per_sec = 1000000; 365 366 if (runtime <= 0) 367 return 0; 368 369 /* drop precision until runtime is 32-bits */ 370 while (runtime > UINT_MAX) { 371 runtime >>= 1; 372 per_sec <<= 1; 373 } 374 375 per_sec *= val; 376 do_div(per_sec, runtime); 377 return per_sec; 378} 379 380static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len) 381{ 382 return dmatest_persec(runtime, len >> 10); 383} 384 385/* 386 * This function repeatedly tests DMA transfers of various lengths and 387 * offsets for a given operation type until it is told to exit by 388 * kthread_stop(). There may be multiple threads running this function 389 * in parallel for a single channel, and there may be multiple channels 390 * being tested in parallel. 391 * 392 * Before each test, the source and destination buffer is initialized 393 * with a known pattern. This pattern is different depending on 394 * whether it's in an area which is supposed to be copied or 395 * overwritten, and different in the source and destination buffers. 396 * So if the DMA engine doesn't copy exactly what we tell it to copy, 397 * we'll notice. 398 */ 399static int dmatest_func(void *data) 400{ 401 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait); 402 struct dmatest_thread *thread = data; 403 struct dmatest_done done = { .wait = &done_wait }; 404 struct dmatest_info *info; 405 struct dmatest_params *params; 406 struct dma_chan *chan; 407 struct dma_device *dev; 408 unsigned int error_count; 409 unsigned int failed_tests = 0; 410 unsigned int total_tests = 0; 411 dma_cookie_t cookie; 412 enum dma_status status; 413 enum dma_ctrl_flags flags; 414 u8 *pq_coefs = NULL; 415 int ret; 416 int src_cnt; 417 int dst_cnt; 418 int i; 419 ktime_t ktime; 420 s64 runtime = 0; 421 unsigned long long total_len = 0; 422 423 set_freezable(); 424 425 ret = -ENOMEM; 426 427 smp_rmb(); 428 info = thread->info; 429 params = &info->params; 430 chan = thread->chan; 431 dev = chan->device; 432 if (thread->type == DMA_MEMCPY) 433 src_cnt = dst_cnt = 1; 434 else if (thread->type == DMA_XOR) { 435 /* force odd to ensure dst = src */ 436 src_cnt = min_odd(params->xor_sources | 1, dev->max_xor); 437 dst_cnt = 1; 438 } else if (thread->type == DMA_PQ) { 439 /* force odd to ensure dst = src */ 440 src_cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0)); 441 dst_cnt = 2; 442 443 pq_coefs = kmalloc(params->pq_sources+1, GFP_KERNEL); 444 if (!pq_coefs) 445 goto err_thread_type; 446 447 for (i = 0; i < src_cnt; i++) 448 pq_coefs[i] = 1; 449 } else 450 goto err_thread_type; 451 452 thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL); 453 if (!thread->srcs) 454 goto err_srcs; 455 for (i = 0; i < src_cnt; i++) { 456 thread->srcs[i] = kmalloc(params->buf_size, GFP_KERNEL); 457 if (!thread->srcs[i]) 458 goto err_srcbuf; 459 } 460 thread->srcs[i] = NULL; 461 462 thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL); 463 if (!thread->dsts) 464 goto err_dsts; 465 for (i = 0; i < dst_cnt; i++) { 466 thread->dsts[i] = kmalloc(params->buf_size, GFP_KERNEL); 467 if (!thread->dsts[i]) 468 goto err_dstbuf; 469 } 470 thread->dsts[i] = NULL; 471 472 set_user_nice(current, 10); 473 474 /* 475 * src and dst buffers are freed by ourselves below 476 */ 477 flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; 478 479 ktime = ktime_get(); 480 while (!kthread_should_stop() 481 && !(params->iterations && total_tests >= params->iterations)) { 482 struct dma_async_tx_descriptor *tx = NULL; 483 struct dmaengine_unmap_data *um; 484 dma_addr_t srcs[src_cnt]; 485 dma_addr_t *dsts; 486 unsigned int src_off, dst_off, len; 487 u8 align = 0; 488 489 total_tests++; 490 491 /* honor alignment restrictions */ 492 if (thread->type == DMA_MEMCPY) 493 align = dev->copy_align; 494 else if (thread->type == DMA_XOR) 495 align = dev->xor_align; 496 else if (thread->type == DMA_PQ) 497 align = dev->pq_align; 498 499 if (1 << align > params->buf_size) { 500 pr_err("%u-byte buffer too small for %d-byte alignment\n", 501 params->buf_size, 1 << align); 502 break; 503 } 504 505 if (params->noverify) 506 len = params->buf_size; 507 else 508 len = dmatest_random() % params->buf_size + 1; 509 510 len = (len >> align) << align; 511 if (!len) 512 len = 1 << align; 513 514 total_len += len; 515 516 if (params->noverify) { 517 src_off = 0; 518 dst_off = 0; 519 } else { 520 src_off = dmatest_random() % (params->buf_size - len + 1); 521 dst_off = dmatest_random() % (params->buf_size - len + 1); 522 523 src_off = (src_off >> align) << align; 524 dst_off = (dst_off >> align) << align; 525 526 dmatest_init_srcs(thread->srcs, src_off, len, 527 params->buf_size); 528 dmatest_init_dsts(thread->dsts, dst_off, len, 529 params->buf_size); 530 } 531 532 um = dmaengine_get_unmap_data(dev->dev, src_cnt+dst_cnt, 533 GFP_KERNEL); 534 if (!um) { 535 failed_tests++; 536 result("unmap data NULL", total_tests, 537 src_off, dst_off, len, ret); 538 continue; 539 } 540 541 um->len = params->buf_size; 542 for (i = 0; i < src_cnt; i++) { 543 void *buf = thread->srcs[i]; 544 struct page *pg = virt_to_page(buf); 545 unsigned pg_off = (unsigned long) buf & ~PAGE_MASK; 546 547 um->addr[i] = dma_map_page(dev->dev, pg, pg_off, 548 um->len, DMA_TO_DEVICE); 549 srcs[i] = um->addr[i] + src_off; 550 ret = dma_mapping_error(dev->dev, um->addr[i]); 551 if (ret) { 552 dmaengine_unmap_put(um); 553 result("src mapping error", total_tests, 554 src_off, dst_off, len, ret); 555 failed_tests++; 556 continue; 557 } 558 um->to_cnt++; 559 } 560 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */ 561 dsts = &um->addr[src_cnt]; 562 for (i = 0; i < dst_cnt; i++) { 563 void *buf = thread->dsts[i]; 564 struct page *pg = virt_to_page(buf); 565 unsigned pg_off = (unsigned long) buf & ~PAGE_MASK; 566 567 dsts[i] = dma_map_page(dev->dev, pg, pg_off, um->len, 568 DMA_BIDIRECTIONAL); 569 ret = dma_mapping_error(dev->dev, dsts[i]); 570 if (ret) { 571 dmaengine_unmap_put(um); 572 result("dst mapping error", total_tests, 573 src_off, dst_off, len, ret); 574 failed_tests++; 575 continue; 576 } 577 um->bidi_cnt++; 578 } 579 580 if (thread->type == DMA_MEMCPY) 581 tx = dev->device_prep_dma_memcpy(chan, 582 dsts[0] + dst_off, 583 srcs[0], len, flags); 584 else if (thread->type == DMA_XOR) 585 tx = dev->device_prep_dma_xor(chan, 586 dsts[0] + dst_off, 587 srcs, src_cnt, 588 len, flags); 589 else if (thread->type == DMA_PQ) { 590 dma_addr_t dma_pq[dst_cnt]; 591 592 for (i = 0; i < dst_cnt; i++) 593 dma_pq[i] = dsts[i] + dst_off; 594 tx = dev->device_prep_dma_pq(chan, dma_pq, srcs, 595 src_cnt, pq_coefs, 596 len, flags); 597 } 598 599 if (!tx) { 600 dmaengine_unmap_put(um); 601 result("prep error", total_tests, src_off, 602 dst_off, len, ret); 603 msleep(100); 604 failed_tests++; 605 continue; 606 } 607 608 done.done = false; 609 tx->callback = dmatest_callback; 610 tx->callback_param = &done; 611 cookie = tx->tx_submit(tx); 612 613 if (dma_submit_error(cookie)) { 614 dmaengine_unmap_put(um); 615 result("submit error", total_tests, src_off, 616 dst_off, len, ret); 617 msleep(100); 618 failed_tests++; 619 continue; 620 } 621 dma_async_issue_pending(chan); 622 623 wait_event_freezable_timeout(done_wait, done.done, 624 msecs_to_jiffies(params->timeout)); 625 626 status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); 627 628 if (!done.done) { 629 /* 630 * We're leaving the timed out dma operation with 631 * dangling pointer to done_wait. To make this 632 * correct, we'll need to allocate wait_done for 633 * each test iteration and perform "who's gonna 634 * free it this time?" dancing. For now, just 635 * leave it dangling. 636 */ 637 dmaengine_unmap_put(um); 638 result("test timed out", total_tests, src_off, dst_off, 639 len, 0); 640 failed_tests++; 641 continue; 642 } else if (status != DMA_COMPLETE) { 643 dmaengine_unmap_put(um); 644 result(status == DMA_ERROR ? 645 "completion error status" : 646 "completion busy status", total_tests, src_off, 647 dst_off, len, ret); 648 failed_tests++; 649 continue; 650 } 651 652 dmaengine_unmap_put(um); 653 654 if (params->noverify) { 655 verbose_result("test passed", total_tests, src_off, 656 dst_off, len, 0); 657 continue; 658 } 659 660 pr_debug("%s: verifying source buffer...\n", current->comm); 661 error_count = dmatest_verify(thread->srcs, 0, src_off, 662 0, PATTERN_SRC, true); 663 error_count += dmatest_verify(thread->srcs, src_off, 664 src_off + len, src_off, 665 PATTERN_SRC | PATTERN_COPY, true); 666 error_count += dmatest_verify(thread->srcs, src_off + len, 667 params->buf_size, src_off + len, 668 PATTERN_SRC, true); 669 670 pr_debug("%s: verifying dest buffer...\n", current->comm); 671 error_count += dmatest_verify(thread->dsts, 0, dst_off, 672 0, PATTERN_DST, false); 673 error_count += dmatest_verify(thread->dsts, dst_off, 674 dst_off + len, src_off, 675 PATTERN_SRC | PATTERN_COPY, false); 676 error_count += dmatest_verify(thread->dsts, dst_off + len, 677 params->buf_size, dst_off + len, 678 PATTERN_DST, false); 679 680 if (error_count) { 681 result("data error", total_tests, src_off, dst_off, 682 len, error_count); 683 failed_tests++; 684 } else { 685 verbose_result("test passed", total_tests, src_off, 686 dst_off, len, 0); 687 } 688 } 689 runtime = ktime_us_delta(ktime_get(), ktime); 690 691 ret = 0; 692err_dstbuf: 693 for (i = 0; thread->dsts[i]; i++) 694 kfree(thread->dsts[i]); 695 kfree(thread->dsts); 696err_dsts: 697err_srcbuf: 698 for (i = 0; thread->srcs[i]; i++) 699 kfree(thread->srcs[i]); 700 kfree(thread->srcs); 701err_srcs: 702 kfree(pq_coefs); 703err_thread_type: 704 pr_info("%s: summary %u tests, %u failures %llu iops %llu KB/s (%d)\n", 705 current->comm, total_tests, failed_tests, 706 dmatest_persec(runtime, total_tests), 707 dmatest_KBs(runtime, total_len), ret); 708 709 /* terminate all transfers on specified channels */ 710 if (ret) 711 dmaengine_terminate_all(chan); 712 713 thread->done = true; 714 wake_up(&thread_wait); 715 716 return ret; 717} 718 719static void dmatest_cleanup_channel(struct dmatest_chan *dtc) 720{ 721 struct dmatest_thread *thread; 722 struct dmatest_thread *_thread; 723 int ret; 724 725 list_for_each_entry_safe(thread, _thread, &dtc->threads, node) { 726 ret = kthread_stop(thread->task); 727 pr_debug("thread %s exited with status %d\n", 728 thread->task->comm, ret); 729 list_del(&thread->node); 730 put_task_struct(thread->task); 731 kfree(thread); 732 } 733 734 /* terminate all transfers on specified channels */ 735 dmaengine_terminate_all(dtc->chan); 736 737 kfree(dtc); 738} 739 740static int dmatest_add_threads(struct dmatest_info *info, 741 struct dmatest_chan *dtc, enum dma_transaction_type type) 742{ 743 struct dmatest_params *params = &info->params; 744 struct dmatest_thread *thread; 745 struct dma_chan *chan = dtc->chan; 746 char *op; 747 unsigned int i; 748 749 if (type == DMA_MEMCPY) 750 op = "copy"; 751 else if (type == DMA_XOR) 752 op = "xor"; 753 else if (type == DMA_PQ) 754 op = "pq"; 755 else 756 return -EINVAL; 757 758 for (i = 0; i < params->threads_per_chan; i++) { 759 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL); 760 if (!thread) { 761 pr_warn("No memory for %s-%s%u\n", 762 dma_chan_name(chan), op, i); 763 break; 764 } 765 thread->info = info; 766 thread->chan = dtc->chan; 767 thread->type = type; 768 smp_wmb(); 769 thread->task = kthread_create(dmatest_func, thread, "%s-%s%u", 770 dma_chan_name(chan), op, i); 771 if (IS_ERR(thread->task)) { 772 pr_warn("Failed to create thread %s-%s%u\n", 773 dma_chan_name(chan), op, i); 774 kfree(thread); 775 break; 776 } 777 778 /* srcbuf and dstbuf are allocated by the thread itself */ 779 get_task_struct(thread->task); 780 list_add_tail(&thread->node, &dtc->threads); 781 wake_up_process(thread->task); 782 } 783 784 return i; 785} 786 787static int dmatest_add_channel(struct dmatest_info *info, 788 struct dma_chan *chan) 789{ 790 struct dmatest_chan *dtc; 791 struct dma_device *dma_dev = chan->device; 792 unsigned int thread_count = 0; 793 int cnt; 794 795 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL); 796 if (!dtc) { 797 pr_warn("No memory for %s\n", dma_chan_name(chan)); 798 return -ENOMEM; 799 } 800 801 dtc->chan = chan; 802 INIT_LIST_HEAD(&dtc->threads); 803 804 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { 805 cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY); 806 thread_count += cnt > 0 ? cnt : 0; 807 } 808 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { 809 cnt = dmatest_add_threads(info, dtc, DMA_XOR); 810 thread_count += cnt > 0 ? cnt : 0; 811 } 812 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { 813 cnt = dmatest_add_threads(info, dtc, DMA_PQ); 814 thread_count += cnt > 0 ? cnt : 0; 815 } 816 817 pr_info("Started %u threads using %s\n", 818 thread_count, dma_chan_name(chan)); 819 820 list_add_tail(&dtc->node, &info->channels); 821 info->nr_channels++; 822 823 return 0; 824} 825 826static bool filter(struct dma_chan *chan, void *param) 827{ 828 struct dmatest_params *params = param; 829 830 if (!dmatest_match_channel(params, chan) || 831 !dmatest_match_device(params, chan->device)) 832 return false; 833 else 834 return true; 835} 836 837static void request_channels(struct dmatest_info *info, 838 enum dma_transaction_type type) 839{ 840 dma_cap_mask_t mask; 841 842 dma_cap_zero(mask); 843 dma_cap_set(type, mask); 844 for (;;) { 845 struct dmatest_params *params = &info->params; 846 struct dma_chan *chan; 847 848 chan = dma_request_channel(mask, filter, params); 849 if (chan) { 850 if (dmatest_add_channel(info, chan)) { 851 dma_release_channel(chan); 852 break; /* add_channel failed, punt */ 853 } 854 } else 855 break; /* no more channels available */ 856 if (params->max_channels && 857 info->nr_channels >= params->max_channels) 858 break; /* we have all we need */ 859 } 860} 861 862static void run_threaded_test(struct dmatest_info *info) 863{ 864 struct dmatest_params *params = &info->params; 865 866 /* Copy test parameters */ 867 params->buf_size = test_buf_size; 868 strlcpy(params->channel, strim(test_channel), sizeof(params->channel)); 869 strlcpy(params->device, strim(test_device), sizeof(params->device)); 870 params->threads_per_chan = threads_per_chan; 871 params->max_channels = max_channels; 872 params->iterations = iterations; 873 params->xor_sources = xor_sources; 874 params->pq_sources = pq_sources; 875 params->timeout = timeout; 876 params->noverify = noverify; 877 878 request_channels(info, DMA_MEMCPY); 879 request_channels(info, DMA_XOR); 880 request_channels(info, DMA_PQ); 881} 882 883static void stop_threaded_test(struct dmatest_info *info) 884{ 885 struct dmatest_chan *dtc, *_dtc; 886 struct dma_chan *chan; 887 888 list_for_each_entry_safe(dtc, _dtc, &info->channels, node) { 889 list_del(&dtc->node); 890 chan = dtc->chan; 891 dmatest_cleanup_channel(dtc); 892 pr_debug("dropped channel %s\n", dma_chan_name(chan)); 893 dma_release_channel(chan); 894 } 895 896 info->nr_channels = 0; 897} 898 899static void restart_threaded_test(struct dmatest_info *info, bool run) 900{ 901 /* we might be called early to set run=, defer running until all 902 * parameters have been evaluated 903 */ 904 if (!info->did_init) 905 return; 906 907 /* Stop any running test first */ 908 stop_threaded_test(info); 909 910 /* Run test with new parameters */ 911 run_threaded_test(info); 912} 913 914static int dmatest_run_get(char *val, const struct kernel_param *kp) 915{ 916 struct dmatest_info *info = &test_info; 917 918 mutex_lock(&info->lock); 919 if (is_threaded_test_run(info)) { 920 dmatest_run = true; 921 } else { 922 stop_threaded_test(info); 923 dmatest_run = false; 924 } 925 mutex_unlock(&info->lock); 926 927 return param_get_bool(val, kp); 928} 929 930static int dmatest_run_set(const char *val, const struct kernel_param *kp) 931{ 932 struct dmatest_info *info = &test_info; 933 int ret; 934 935 mutex_lock(&info->lock); 936 ret = param_set_bool(val, kp); 937 if (ret) { 938 mutex_unlock(&info->lock); 939 return ret; 940 } 941 942 if (is_threaded_test_run(info)) 943 ret = -EBUSY; 944 else if (dmatest_run) 945 restart_threaded_test(info, dmatest_run); 946 947 mutex_unlock(&info->lock); 948 949 return ret; 950} 951 952static int __init dmatest_init(void) 953{ 954 struct dmatest_info *info = &test_info; 955 struct dmatest_params *params = &info->params; 956 957 if (dmatest_run) { 958 mutex_lock(&info->lock); 959 run_threaded_test(info); 960 mutex_unlock(&info->lock); 961 } 962 963 if (params->iterations && wait) 964 wait_event(thread_wait, !is_threaded_test_run(info)); 965 966 /* module parameters are stable, inittime tests are started, 967 * let userspace take over 'run' control 968 */ 969 info->did_init = true; 970 971 return 0; 972} 973/* when compiled-in wait for drivers to load first */ 974late_initcall(dmatest_init); 975 976static void __exit dmatest_exit(void) 977{ 978 struct dmatest_info *info = &test_info; 979 980 mutex_lock(&info->lock); 981 stop_threaded_test(info); 982 mutex_unlock(&info->lock); 983} 984module_exit(dmatest_exit); 985 986MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); 987MODULE_LICENSE("GPL v2"); 988