drivers/dma/dmatest.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * DMA Engine test module
   4  *
   5  * Copyright (C) 2007 Atmel Corporation
   6  * Copyright (C) 2013 Intel Corporation
   7  */
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/err.h>
  11 #include <linux/delay.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/dmaengine.h>
  14 #include <linux/freezer.h>
  15 #include <linux/init.h>
  16 #include <linux/kthread.h>
  17 #include <linux/sched/task.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/random.h>
  21 #include <linux/slab.h>
  22 #include <linux/wait.h>
  23
  24 static unsigned int test_buf_size = 16384;
  25 module_param(test_buf_size, uint, S_IRUGO | S_IWUSR);
  26 MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
  27
  28 static char test_device[32];
  29 module_param_string(device, test_device, sizeof(test_device),
  30                 S_IRUGO | S_IWUSR);
  31 MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
  32
  33 static unsigned int threads_per_chan = 1;
  34 module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR);
  35 MODULE_PARM_DESC(threads_per_chan,
  36                 "Number of threads to start per channel (default: 1)");
  37
  38 static unsigned int max_channels;
  39 module_param(max_channels, uint, S_IRUGO | S_IWUSR);
  40 MODULE_PARM_DESC(max_channels,
  41                 "Maximum number of channels to use (default: all)");
  42
  43 static unsigned int iterations;
  44 module_param(iterations, uint, S_IRUGO | S_IWUSR);
  45 MODULE_PARM_DESC(iterations,
  46                 "Iterations before stopping test (default: infinite)");
  47
  48 static unsigned int dmatest;
  49 module_param(dmatest, uint, S_IRUGO | S_IWUSR);
  50 MODULE_PARM_DESC(dmatest,
  51                 "dmatest 0-memcpy 1-memset (default: 0)");
  52
  53 static unsigned int xor_sources = 3;
  54 module_param(xor_sources, uint, S_IRUGO | S_IWUSR);
  55 MODULE_PARM_DESC(xor_sources,
  56                 "Number of xor source buffers (default: 3)");
  57
  58 static unsigned int pq_sources = 3;
  59 module_param(pq_sources, uint, S_IRUGO | S_IWUSR);
  60 MODULE_PARM_DESC(pq_sources,
  61                 "Number of p+q source buffers (default: 3)");
  62
  63 static int timeout = 3000;
  64 module_param(timeout, int, S_IRUGO | S_IWUSR);
  65 MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
  66                  "Pass -1 for infinite timeout");
  67
  68 static bool noverify;
  69 module_param(noverify, bool, S_IRUGO | S_IWUSR);
  70 MODULE_PARM_DESC(noverify, "Disable data verification (default: verify)");
  71
  72 static bool norandom;
  73 module_param(norandom, bool, 0644);
  74 MODULE_PARM_DESC(norandom, "Disable random offset setup (default: random)");
  75
  76 static bool verbose;
  77 module_param(verbose, bool, S_IRUGO | S_IWUSR);
  78 MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)");
  79
  80 static int alignment = -1;
  81 module_param(alignment, int, 0644);
  82 MODULE_PARM_DESC(alignment, "Custom data address alignment taken as 2^(alignment) (default: not used (-1))");
  83
  84 static unsigned int transfer_size;
  85 module_param(transfer_size, uint, 0644);
  86 MODULE_PARM_DESC(transfer_size, "Optional custom transfer size in bytes (default: not used (0))");
  87
  88 static bool polled;
  89 module_param(polled, bool, S_IRUGO | S_IWUSR);
  90 MODULE_PARM_DESC(polled, "Use polling for completion instead of interrupts");
  91
  92 /**
  93  * struct dmatest_params - test parameters.
  94  * @buf_size:           size of the memcpy test buffer
  95  * @channel:            bus ID of the channel to test
  96  * @device:             bus ID of the DMA Engine to test
  97  * @threads_per_chan:   number of threads to start per channel
  98  * @max_channels:       maximum number of channels to use
  99  * @iterations:         iterations before stopping test
 100  * @xor_sources:        number of xor source buffers
 101  * @pq_sources:         number of p+q source buffers
 102  * @timeout:            transfer timeout in msec, -1 for infinite timeout
 103  * @noverify:           disable data verification
 104  * @norandom:           disable random offset setup
 105  * @alignment:          custom data address alignment taken as 2^alignment
 106  * @transfer_size:      custom transfer size in bytes
 107  * @polled:             use polling for completion instead of interrupts
 108  */
 109 struct dmatest_params {
 110         unsigned int    buf_size;
 111         char            channel[20];
 112         char            device[32];
 113         unsigned int    threads_per_chan;
 114         unsigned int    max_channels;
 115         unsigned int    iterations;
 116         unsigned int    xor_sources;
 117         unsigned int    pq_sources;
 118         int             timeout;
 119         bool            noverify;
 120         bool            norandom;
 121         int             alignment;
 122         unsigned int    transfer_size;
 123         bool            polled;
 124 };
 125
 126 /**
 127  * struct dmatest_info - test information.
 128  * @params:             test parameters
 129  * @channels:           channels under test
 130  * @nr_channels:        number of channels under test
 131  * @lock:               access protection to the fields of this structure
 132  * @did_init:           module has been initialized completely
 133  * @last_error:         test has faced configuration issues
 134  */
 135 static struct dmatest_info {
 136         /* Test parameters */
 137         struct dmatest_params   params;
 138
 139         /* Internal state */
 140         struct list_head        channels;
 141         unsigned int            nr_channels;
 142         int                     last_error;
 143         struct mutex            lock;
 144         bool                    did_init;
 145 } test_info = {
 146         .channels = LIST_HEAD_INIT(test_info.channels),
 147         .lock = __MUTEX_INITIALIZER(test_info.lock),
 148 };
 149
 150 static int dmatest_run_set(const char *val, const struct kernel_param *kp);
 151 static int dmatest_run_get(char *val, const struct kernel_param *kp);
 152 static const struct kernel_param_ops run_ops = {
 153         .set = dmatest_run_set,
 154         .get = dmatest_run_get,
 155 };
 156 static bool dmatest_run;
 157 module_param_cb(run, &run_ops, &dmatest_run, S_IRUGO | S_IWUSR);
 158 MODULE_PARM_DESC(run, "Run the test (default: false)");
 159
 160 static int dmatest_chan_set(const char *val, const struct kernel_param *kp);
 161 static int dmatest_chan_get(char *val, const struct kernel_param *kp);
 162 static const struct kernel_param_ops multi_chan_ops = {
 163         .set = dmatest_chan_set,
 164         .get = dmatest_chan_get,
 165 };
 166
 167 static char test_channel[20];
 168 static struct kparam_string newchan_kps = {
 169         .string = test_channel,
 170         .maxlen = 20,
 171 };
 172 module_param_cb(channel, &multi_chan_ops, &newchan_kps, 0644);
 173 MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
 174
 175 static int dmatest_test_list_get(char *val, const struct kernel_param *kp);
 176 static const struct kernel_param_ops test_list_ops = {
 177         .get = dmatest_test_list_get,
 178 };
 179 module_param_cb(test_list, &test_list_ops, NULL, 0444);
 180 MODULE_PARM_DESC(test_list, "Print current test list");
 181
 182 /* Maximum amount of mismatched bytes in buffer to print */
 183 #define MAX_ERROR_COUNT         32
 184
 185 /*
 186  * Initialization patterns. All bytes in the source buffer has bit 7
 187  * set, all bytes in the destination buffer has bit 7 cleared.
 188  *
 189  * Bit 6 is set for all bytes which are to be copied by the DMA
 190  * engine. Bit 5 is set for all bytes which are to be overwritten by
 191  * the DMA engine.
 192  *
 193  * The remaining bits are the inverse of a counter which increments by
 194  * one for each byte address.
 195  */
 196 #define PATTERN_SRC             0x80
 197 #define PATTERN_DST             0x00
 198 #define PATTERN_COPY            0x40
 199 #define PATTERN_OVERWRITE       0x20
 200 #define PATTERN_COUNT_MASK      0x1f
 201 #define PATTERN_MEMSET_IDX      0x01
 202
 203 /* Fixed point arithmetic ops */
 204 #define FIXPT_SHIFT             8
 205 #define FIXPNT_MASK             0xFF
 206 #define FIXPT_TO_INT(a) ((a) >> FIXPT_SHIFT)
 207 #define INT_TO_FIXPT(a) ((a) << FIXPT_SHIFT)
 208 #define FIXPT_GET_FRAC(a)       ((((a) & FIXPNT_MASK) * 100) >> FIXPT_SHIFT)
 209
 210 /* poor man's completion - we want to use wait_event_freezable() on it */
 211 struct dmatest_done {
 212         bool                    done;
 213         wait_queue_head_t       *wait;
 214 };
 215
 216 struct dmatest_data {
 217         u8              **raw;
 218         u8              **aligned;
 219         unsigned int    cnt;
 220         unsigned int    off;
 221 };
 222
 223 struct dmatest_thread {
 224         struct list_head        node;
 225         struct dmatest_info     *info;
 226         struct task_struct      *task;
 227         struct dma_chan         *chan;
 228         struct dmatest_data     src;
 229         struct dmatest_data     dst;
 230         enum dma_transaction_type type;
 231         wait_queue_head_t done_wait;
 232         struct dmatest_done test_done;
 233         bool                    done;
 234         bool                    pending;
 235 };
 236
 237 struct dmatest_chan {
 238         struct list_head        node;
 239         struct dma_chan         *chan;
 240         struct list_head        threads;
 241 };
 242
 243 static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
 244 static bool wait;
 245
 246 static bool is_threaded_test_run(struct dmatest_info *info)
 247 {
 248         struct dmatest_chan *dtc;
 249
 250         list_for_each_entry(dtc, &info->channels, node) {
 251                 struct dmatest_thread *thread;
 252
 253                 list_for_each_entry(thread, &dtc->threads, node) {
 254                         if (!thread->done && !thread->pending)
 255                                 return true;
 256                 }
 257         }
 258
 259         return false;
 260 }
 261
 262 static bool is_threaded_test_pending(struct dmatest_info *info)
 263 {
 264         struct dmatest_chan *dtc;
 265
 266         list_for_each_entry(dtc, &info->channels, node) {
 267                 struct dmatest_thread *thread;
 268
 269                 list_for_each_entry(thread, &dtc->threads, node) {
 270                         if (thread->pending)
 271                                 return true;
 272                 }
 273         }
 274
 275         return false;
 276 }
 277
 278 static int dmatest_wait_get(char *val, const struct kernel_param *kp)
 279 {
 280         struct dmatest_info *info = &test_info;
 281         struct dmatest_params *params = &info->params;
 282
 283         if (params->iterations)
 284                 wait_event(thread_wait, !is_threaded_test_run(info));
 285         wait = true;
 286         return param_get_bool(val, kp);
 287 }
 288
 289 static const struct kernel_param_ops wait_ops = {
 290         .get = dmatest_wait_get,
 291         .set = param_set_bool,
 292 };
 293 module_param_cb(wait, &wait_ops, &wait, S_IRUGO);
 294 MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)");
 295
 296 static bool dmatest_match_channel(struct dmatest_params *params,
 297                 struct dma_chan *chan)
 298 {
 299         if (params->channel[0] == '\0')
 300                 return true;
 301         return strcmp(dma_chan_name(chan), params->channel) == 0;
 302 }
 303
 304 static bool dmatest_match_device(struct dmatest_params *params,
 305                 struct dma_device *device)
 306 {
 307         if (params->device[0] == '\0')
 308                 return true;
 309         return strcmp(dev_name(device->dev), params->device) == 0;
 310 }
 311
 312 static unsigned long dmatest_random(void)
 313 {
 314         unsigned long buf;
 315
 316         prandom_bytes(&buf, sizeof(buf));
 317         return buf;
 318 }
 319
 320 static inline u8 gen_inv_idx(u8 index, bool is_memset)
 321 {
 322         u8 val = is_memset ? PATTERN_MEMSET_IDX : index;
 323
 324         return ~val & PATTERN_COUNT_MASK;
 325 }
 326
 327 static inline u8 gen_src_value(u8 index, bool is_memset)
 328 {
 329         return PATTERN_SRC | gen_inv_idx(index, is_memset);
 330 }
 331
 332 static inline u8 gen_dst_value(u8 index, bool is_memset)
 333 {
 334         return PATTERN_DST | gen_inv_idx(index, is_memset);
 335 }
 336
 337 static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
 338                 unsigned int buf_size, bool is_memset)
 339 {
 340         unsigned int i;
 341         u8 *buf;
 342
 343         for (; (buf = *bufs); bufs++) {
 344                 for (i = 0; i < start; i++)
 345                         buf[i] = gen_src_value(i, is_memset);
 346                 for ( ; i < start + len; i++)
 347                         buf[i] = gen_src_value(i, is_memset) | PATTERN_COPY;
 348                 for ( ; i < buf_size; i++)
 349                         buf[i] = gen_src_value(i, is_memset);
 350                 buf++;
 351         }
 352 }
 353
 354 static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
 355                 unsigned int buf_size, bool is_memset)
 356 {
 357         unsigned int i;
 358         u8 *buf;
 359
 360         for (; (buf = *bufs); bufs++) {
 361                 for (i = 0; i < start; i++)
 362                         buf[i] = gen_dst_value(i, is_memset);
 363                 for ( ; i < start + len; i++)
 364                         buf[i] = gen_dst_value(i, is_memset) |
 365                                                 PATTERN_OVERWRITE;
 366                 for ( ; i < buf_size; i++)
 367                         buf[i] = gen_dst_value(i, is_memset);
 368         }
 369 }
 370
 371 static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
 372                 unsigned int counter, bool is_srcbuf, bool is_memset)
 373 {
 374         u8              diff = actual ^ pattern;
 375         u8              expected = pattern | gen_inv_idx(counter, is_memset);
 376         const char      *thread_name = current->comm;
 377
 378         if (is_srcbuf)
 379                 pr_warn("%s: srcbuf[0x%x] overwritten! Expected %02x, got %02x\n",
 380                         thread_name, index, expected, actual);
 381         else if ((pattern & PATTERN_COPY)
 382                         && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
 383                 pr_warn("%s: dstbuf[0x%x] not copied! Expected %02x, got %02x\n",
 384                         thread_name, index, expected, actual);
 385         else if (diff & PATTERN_SRC)
 386                 pr_warn("%s: dstbuf[0x%x] was copied! Expected %02x, got %02x\n",
 387                         thread_name, index, expected, actual);
 388         else
 389                 pr_warn("%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n",
 390                         thread_name, index, expected, actual);
 391 }
 392
 393 static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
 394                 unsigned int end, unsigned int counter, u8 pattern,
 395                 bool is_srcbuf, bool is_memset)
 396 {
 397         unsigned int i;
 398         unsigned int error_count = 0;
 399         u8 actual;
 400         u8 expected;
 401         u8 *buf;
 402         unsigned int counter_orig = counter;
 403
 404         for (; (buf = *bufs); bufs++) {
 405                 counter = counter_orig;
 406                 for (i = start; i < end; i++) {
 407                         actual = buf[i];
 408                         expected = pattern | gen_inv_idx(counter, is_memset);
 409                         if (actual != expected) {
 410                                 if (error_count < MAX_ERROR_COUNT)
 411                                         dmatest_mismatch(actual, pattern, i,
 412                                                          counter, is_srcbuf,
 413                                                          is_memset);
 414                                 error_count++;
 415                         }
 416                         counter++;
 417                 }
 418         }
 419
 420         if (error_count > MAX_ERROR_COUNT)
 421                 pr_warn("%s: %u errors suppressed\n",
 422                         current->comm, error_count - MAX_ERROR_COUNT);
 423
 424         return error_count;
 425 }
 426
 427
 428 static void dmatest_callback(void *arg)
 429 {
 430         struct dmatest_done *done = arg;
 431         struct dmatest_thread *thread =
 432                 container_of(done, struct dmatest_thread, test_done);
 433         if (!thread->done) {
 434                 done->done = true;
 435                 wake_up_all(done->wait);
 436         } else {
 437                 /*
 438                  * If thread->done, it means that this callback occurred
 439                  * after the parent thread has cleaned up. This can
 440                  * happen in the case that driver doesn't implement
 441                  * the terminate_all() functionality and a dma operation
 442                  * did not occur within the timeout period
 443                  */
 444                 WARN(1, "dmatest: Kernel memory may be corrupted!!\n");
 445         }
 446 }
 447
 448 static unsigned int min_odd(unsigned int x, unsigned int y)
 449 {
 450         unsigned int val = min(x, y);
 451
 452         return val % 2 ? val : val - 1;
 453 }
 454
 455 static void result(const char *err, unsigned int n, unsigned int src_off,
 456                    unsigned int dst_off, unsigned int len, unsigned long data)
 457 {
 458         if (IS_ERR_VALUE(data)) {
 459                 pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%ld)\n",
 460                         current->comm, n, err, src_off, dst_off, len, data);
 461         } else {
 462                 pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
 463                         current->comm, n, err, src_off, dst_off, len, data);
 464         }
 465 }
 466
 467 static void dbg_result(const char *err, unsigned int n, unsigned int src_off,
 468                        unsigned int dst_off, unsigned int len,
 469                        unsigned long data)
 470 {
 471         pr_debug("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
 472                  current->comm, n, err, src_off, dst_off, len, data);
 473 }
 474
 475 #define verbose_result(err, n, src_off, dst_off, len, data) ({  \
 476         if (verbose)                                            \
 477                 result(err, n, src_off, dst_off, len, data);    \
 478         else                                                    \
 479                 dbg_result(err, n, src_off, dst_off, len, data);\
 480 })
 481
 482 static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
 483 {
 484         unsigned long long per_sec = 1000000;
 485
 486         if (runtime <= 0)
 487                 return 0;
 488
 489         /* drop precision until runtime is 32-bits */
 490         while (runtime > UINT_MAX) {
 491                 runtime >>= 1;
 492                 per_sec <<= 1;
 493         }
 494
 495         per_sec *= val;
 496         per_sec = INT_TO_FIXPT(per_sec);
 497         do_div(per_sec, runtime);
 498
 499         return per_sec;
 500 }
 501
 502 static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
 503 {
 504         return FIXPT_TO_INT(dmatest_persec(runtime, len >> 10));
 505 }
 506
 507 static void __dmatest_free_test_data(struct dmatest_data *d, unsigned int cnt)
 508 {
 509         unsigned int i;
 510
 511         for (i = 0; i < cnt; i++)
 512                 kfree(d->raw[i]);
 513
 514         kfree(d->aligned);
 515         kfree(d->raw);
 516 }
 517
 518 static void dmatest_free_test_data(struct dmatest_data *d)
 519 {
 520         __dmatest_free_test_data(d, d->cnt);
 521 }
 522
 523 static int dmatest_alloc_test_data(struct dmatest_data *d,
 524                 unsigned int buf_size, u8 align)
 525 {
 526         unsigned int i = 0;
 527
 528         d->raw = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
 529         if (!d->raw)
 530                 return -ENOMEM;
 531
 532         d->aligned = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
 533         if (!d->aligned)
 534                 goto err;
 535
 536         for (i = 0; i < d->cnt; i++) {
 537                 d->raw[i] = kmalloc(buf_size + align, GFP_KERNEL);
 538                 if (!d->raw[i])
 539                         goto err;
 540
 541                 /* align to alignment restriction */
 542                 if (align)
 543                         d->aligned[i] = PTR_ALIGN(d->raw[i], align);
 544                 else
 545                         d->aligned[i] = d->raw[i];
 546         }
 547
 548         return 0;
 549 err:
 550         __dmatest_free_test_data(d, i);
 551         return -ENOMEM;
 552 }
 553
 554 /*
 555  * This function repeatedly tests DMA transfers of various lengths and
 556  * offsets for a given operation type until it is told to exit by
 557  * kthread_stop(). There may be multiple threads running this function
 558  * in parallel for a single channel, and there may be multiple channels
 559  * being tested in parallel.
 560  *
 561  * Before each test, the source and destination buffer is initialized
 562  * with a known pattern. This pattern is different depending on
 563  * whether it's in an area which is supposed to be copied or
 564  * overwritten, and different in the source and destination buffers.
 565  * So if the DMA engine doesn't copy exactly what we tell it to copy,
 566  * we'll notice.
 567  */
 568 static int dmatest_func(void *data)
 569 {
 570         struct dmatest_thread   *thread = data;
 571         struct dmatest_done     *done = &thread->test_done;
 572         struct dmatest_info     *info;
 573         struct dmatest_params   *params;
 574         struct dma_chan         *chan;
 575         struct dma_device       *dev;
 576         struct device           *dma_dev;
 577         unsigned int            error_count;
 578         unsigned int            failed_tests = 0;
 579         unsigned int            total_tests = 0;
 580         dma_cookie_t            cookie;
 581         enum dma_status         status;
 582         enum dma_ctrl_flags     flags;
 583         u8                      *pq_coefs = NULL;
 584         int                     ret;
 585         unsigned int            buf_size;
 586         struct dmatest_data     *src;
 587         struct dmatest_data     *dst;
 588         int                     i;
 589         ktime_t                 ktime, start, diff;
 590         ktime_t                 filltime = 0;
 591         ktime_t                 comparetime = 0;
 592         s64                     runtime = 0;
 593         unsigned long long      total_len = 0;
 594         unsigned long long      iops = 0;
 595         u8                      align = 0;
 596         bool                    is_memset = false;
 597         dma_addr_t              *srcs;
 598         dma_addr_t              *dma_pq;
 599
 600         set_freezable();
 601
 602         ret = -ENOMEM;
 603
 604         smp_rmb();
 605         thread->pending = false;
 606         info = thread->info;
 607         params = &info->params;
 608         chan = thread->chan;
 609         dev = chan->device;
 610         dma_dev = dmaengine_get_dma_device(chan);
 611
 612         src = &thread->src;
 613         dst = &thread->dst;
 614         if (thread->type == DMA_MEMCPY) {
 615                 align = params->alignment < 0 ? dev->copy_align :
 616                                                 params->alignment;
 617                 src->cnt = dst->cnt = 1;
 618         } else if (thread->type == DMA_MEMSET) {
 619                 align = params->alignment < 0 ? dev->fill_align :
 620                                                 params->alignment;
 621                 src->cnt = dst->cnt = 1;
 622                 is_memset = true;
 623         } else if (thread->type == DMA_XOR) {
 624                 /* force odd to ensure dst = src */
 625                 src->cnt = min_odd(params->xor_sources | 1, dev->max_xor);
 626                 dst->cnt = 1;
 627                 align = params->alignment < 0 ? dev->xor_align :
 628                                                 params->alignment;
 629         } else if (thread->type == DMA_PQ) {
 630                 /* force odd to ensure dst = src */
 631                 src->cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
 632                 dst->cnt = 2;
 633                 align = params->alignment < 0 ? dev->pq_align :
 634                                                 params->alignment;
 635
 636                 pq_coefs = kmalloc(params->pq_sources + 1, GFP_KERNEL);
 637                 if (!pq_coefs)
 638                         goto err_thread_type;
 639
 640                 for (i = 0; i < src->cnt; i++)
 641                         pq_coefs[i] = 1;
 642         } else
 643                 goto err_thread_type;
 644
 645         /* Check if buffer count fits into map count variable (u8) */
 646         if ((src->cnt + dst->cnt) >= 255) {
 647                 pr_err("too many buffers (%d of 255 supported)\n",
 648                        src->cnt + dst->cnt);
 649                 goto err_free_coefs;
 650         }
 651
 652         buf_size = params->buf_size;
 653         if (1 << align > buf_size) {
 654                 pr_err("%u-byte buffer too small for %d-byte alignment\n",
 655                        buf_size, 1 << align);
 656                 goto err_free_coefs;
 657         }
 658
 659         if (dmatest_alloc_test_data(src, buf_size, align) < 0)
 660                 goto err_free_coefs;
 661
 662         if (dmatest_alloc_test_data(dst, buf_size, align) < 0)
 663                 goto err_src;
 664
 665         set_user_nice(current, 10);
 666
 667         srcs = kcalloc(src->cnt, sizeof(dma_addr_t), GFP_KERNEL);
 668         if (!srcs)
 669                 goto err_dst;
 670
 671         dma_pq = kcalloc(dst->cnt, sizeof(dma_addr_t), GFP_KERNEL);
 672         if (!dma_pq)
 673                 goto err_srcs_array;
 674
 675         /*
 676          * src and dst buffers are freed by ourselves below
 677          */
 678         if (params->polled) {
 679                 flags = DMA_CTRL_ACK;
 680         } else {
 681                 if (dma_has_cap(DMA_INTERRUPT, dev->cap_mask)) {
 682                         flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 683                 } else {
 684                         pr_err("Channel does not support interrupt!\n");
 685                         goto err_pq_array;
 686                 }
 687         }
 688
 689         ktime = ktime_get();
 690         while (!(kthread_should_stop() ||
 691                (params->iterations && total_tests >= params->iterations))) {
 692                 struct dma_async_tx_descriptor *tx = NULL;
 693                 struct dmaengine_unmap_data *um;
 694                 dma_addr_t *dsts;
 695                 unsigned int len;
 696
 697                 total_tests++;
 698
 699                 if (params->transfer_size) {
 700                         if (params->transfer_size >= buf_size) {
 701                                 pr_err("%u-byte transfer size must be lower than %u-buffer size\n",
 702                                        params->transfer_size, buf_size);
 703                                 break;
 704                         }
 705                         len = params->transfer_size;
 706                 } else if (params->norandom) {
 707                         len = buf_size;
 708                 } else {
 709                         len = dmatest_random() % buf_size + 1;
 710                 }
 711
 712                 /* Do not alter transfer size explicitly defined by user */
 713                 if (!params->transfer_size) {
 714                         len = (len >> align) << align;
 715                         if (!len)
 716                                 len = 1 << align;
 717                 }
 718                 total_len += len;
 719
 720                 if (params->norandom) {
 721                         src->off = 0;
 722                         dst->off = 0;
 723                 } else {
 724                         src->off = dmatest_random() % (buf_size - len + 1);
 725                         dst->off = dmatest_random() % (buf_size - len + 1);
 726
 727                         src->off = (src->off >> align) << align;
 728                         dst->off = (dst->off >> align) << align;
 729                 }
 730
 731                 if (!params->noverify) {
 732                         start = ktime_get();
 733                         dmatest_init_srcs(src->aligned, src->off, len,
 734                                           buf_size, is_memset);
 735                         dmatest_init_dsts(dst->aligned, dst->off, len,
 736                                           buf_size, is_memset);
 737
 738                         diff = ktime_sub(ktime_get(), start);
 739                         filltime = ktime_add(filltime, diff);
 740                 }
 741
 742                 um = dmaengine_get_unmap_data(dma_dev, src->cnt + dst->cnt,
 743                                               GFP_KERNEL);
 744                 if (!um) {
 745                         failed_tests++;
 746                         result("unmap data NULL", total_tests,
 747                                src->off, dst->off, len, ret);
 748                         continue;
 749                 }
 750
 751                 um->len = buf_size;
 752                 for (i = 0; i < src->cnt; i++) {
 753                         void *buf = src->aligned[i];
 754                         struct page *pg = virt_to_page(buf);
 755                         unsigned long pg_off = offset_in_page(buf);
 756
 757                         um->addr[i] = dma_map_page(dma_dev, pg, pg_off,
 758                                                    um->len, DMA_TO_DEVICE);
 759                         srcs[i] = um->addr[i] + src->off;
 760                         ret = dma_mapping_error(dma_dev, um->addr[i]);
 761                         if (ret) {
 762                                 result("src mapping error", total_tests,
 763                                        src->off, dst->off, len, ret);
 764                                 goto error_unmap_continue;
 765                         }
 766                         um->to_cnt++;
 767                 }
 768                 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
 769                 dsts = &um->addr[src->cnt];
 770                 for (i = 0; i < dst->cnt; i++) {
 771                         void *buf = dst->aligned[i];
 772                         struct page *pg = virt_to_page(buf);
 773                         unsigned long pg_off = offset_in_page(buf);
 774
 775                         dsts[i] = dma_map_page(dma_dev, pg, pg_off, um->len,
 776                                                DMA_BIDIRECTIONAL);
 777                         ret = dma_mapping_error(dma_dev, dsts[i]);
 778                         if (ret) {
 779                                 result("dst mapping error", total_tests,
 780                                        src->off, dst->off, len, ret);
 781                                 goto error_unmap_continue;
 782                         }
 783                         um->bidi_cnt++;
 784                 }
 785
 786                 if (thread->type == DMA_MEMCPY)
 787                         tx = dev->device_prep_dma_memcpy(chan,
 788                                                          dsts[0] + dst->off,
 789                                                          srcs[0], len, flags);
 790                 else if (thread->type == DMA_MEMSET)
 791                         tx = dev->device_prep_dma_memset(chan,
 792                                                 dsts[0] + dst->off,
 793                                                 *(src->aligned[0] + src->off),
 794                                                 len, flags);
 795                 else if (thread->type == DMA_XOR)
 796                         tx = dev->device_prep_dma_xor(chan,
 797                                                       dsts[0] + dst->off,
 798                                                       srcs, src->cnt,
 799                                                       len, flags);
 800                 else if (thread->type == DMA_PQ) {
 801                         for (i = 0; i < dst->cnt; i++)
 802                                 dma_pq[i] = dsts[i] + dst->off;
 803                         tx = dev->device_prep_dma_pq(chan, dma_pq, srcs,
 804                                                      src->cnt, pq_coefs,
 805                                                      len, flags);
 806                 }
 807
 808                 if (!tx) {
 809                         result("prep error", total_tests, src->off,
 810                                dst->off, len, ret);
 811                         msleep(100);
 812                         goto error_unmap_continue;
 813                 }
 814
 815                 done->done = false;
 816                 if (!params->polled) {
 817                         tx->callback = dmatest_callback;
 818                         tx->callback_param = done;
 819                 }
 820                 cookie = tx->tx_submit(tx);
 821
 822                 if (dma_submit_error(cookie)) {
 823                         result("submit error", total_tests, src->off,
 824                                dst->off, len, ret);
 825                         msleep(100);
 826                         goto error_unmap_continue;
 827                 }
 828
 829                 if (params->polled) {
 830                         status = dma_sync_wait(chan, cookie);
 831                         dmaengine_terminate_sync(chan);
 832                         if (status == DMA_COMPLETE)
 833                                 done->done = true;
 834                 } else {
 835                         dma_async_issue_pending(chan);
 836
 837                         wait_event_freezable_timeout(thread->done_wait,
 838                                         done->done,
 839                                         msecs_to_jiffies(params->timeout));
 840
 841                         status = dma_async_is_tx_complete(chan, cookie, NULL,
 842                                                           NULL);
 843                 }
 844
 845                 if (!done->done) {
 846                         result("test timed out", total_tests, src->off, dst->off,
 847                                len, 0);
 848                         goto error_unmap_continue;
 849                 } else if (status != DMA_COMPLETE &&
 850                            !(dma_has_cap(DMA_COMPLETION_NO_ORDER,
 851                                          dev->cap_mask) &&
 852                              status == DMA_OUT_OF_ORDER)) {
 853                         result(status == DMA_ERROR ?
 854                                "completion error status" :
 855                                "completion busy status", total_tests, src->off,
 856                                dst->off, len, ret);
 857                         goto error_unmap_continue;
 858                 }
 859
 860                 dmaengine_unmap_put(um);
 861
 862                 if (params->noverify) {
 863                         verbose_result("test passed", total_tests, src->off,
 864                                        dst->off, len, 0);
 865                         continue;
 866                 }
 867
 868                 start = ktime_get();
 869                 pr_debug("%s: verifying source buffer...\n", current->comm);
 870                 error_count = dmatest_verify(src->aligned, 0, src->off,
 871                                 0, PATTERN_SRC, true, is_memset);
 872                 error_count += dmatest_verify(src->aligned, src->off,
 873                                 src->off + len, src->off,
 874                                 PATTERN_SRC | PATTERN_COPY, true, is_memset);
 875                 error_count += dmatest_verify(src->aligned, src->off + len,
 876                                 buf_size, src->off + len,
 877                                 PATTERN_SRC, true, is_memset);
 878
 879                 pr_debug("%s: verifying dest buffer...\n", current->comm);
 880                 error_count += dmatest_verify(dst->aligned, 0, dst->off,
 881                                 0, PATTERN_DST, false, is_memset);
 882
 883                 error_count += dmatest_verify(dst->aligned, dst->off,
 884                                 dst->off + len, src->off,
 885                                 PATTERN_SRC | PATTERN_COPY, false, is_memset);
 886
 887                 error_count += dmatest_verify(dst->aligned, dst->off + len,
 888                                 buf_size, dst->off + len,
 889                                 PATTERN_DST, false, is_memset);
 890
 891                 diff = ktime_sub(ktime_get(), start);
 892                 comparetime = ktime_add(comparetime, diff);
 893
 894                 if (error_count) {
 895                         result("data error", total_tests, src->off, dst->off,
 896                                len, error_count);
 897                         failed_tests++;
 898                 } else {
 899                         verbose_result("test passed", total_tests, src->off,
 900                                        dst->off, len, 0);
 901                 }
 902
 903                 continue;
 904
 905 error_unmap_continue:
 906                 dmaengine_unmap_put(um);
 907                 failed_tests++;
 908         }
 909         ktime = ktime_sub(ktime_get(), ktime);
 910         ktime = ktime_sub(ktime, comparetime);
 911         ktime = ktime_sub(ktime, filltime);
 912         runtime = ktime_to_us(ktime);
 913
 914         ret = 0;
 915 err_pq_array:
 916         kfree(dma_pq);
 917 err_srcs_array:
 918         kfree(srcs);
 919 err_dst:
 920         dmatest_free_test_data(dst);
 921 err_src:
 922         dmatest_free_test_data(src);
 923 err_free_coefs:
 924         kfree(pq_coefs);
 925 err_thread_type:
 926         iops = dmatest_persec(runtime, total_tests);
 927         pr_info("%s: summary %u tests, %u failures %llu.%02llu iops %llu KB/s (%d)\n",
 928                 current->comm, total_tests, failed_tests,
 929                 FIXPT_TO_INT(iops), FIXPT_GET_FRAC(iops),
 930                 dmatest_KBs(runtime, total_len), ret);
 931
 932         /* terminate all transfers on specified channels */
 933         if (ret || failed_tests)
 934                 dmaengine_terminate_sync(chan);
 935
 936         thread->done = true;
 937         wake_up(&thread_wait);
 938
 939         return ret;
 940 }
 941
 942 static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
 943 {
 944         struct dmatest_thread   *thread;
 945         struct dmatest_thread   *_thread;
 946         int                     ret;
 947
 948         list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
 949                 ret = kthread_stop(thread->task);
 950                 pr_debug("thread %s exited with status %d\n",
 951                          thread->task->comm, ret);
 952                 list_del(&thread->node);
 953                 put_task_struct(thread->task);
 954                 kfree(thread);
 955         }
 956
 957         /* terminate all transfers on specified channels */
 958         dmaengine_terminate_sync(dtc->chan);
 959
 960         kfree(dtc);
 961 }
 962
 963 static int dmatest_add_threads(struct dmatest_info *info,
 964                 struct dmatest_chan *dtc, enum dma_transaction_type type)
 965 {
 966         struct dmatest_params *params = &info->params;
 967         struct dmatest_thread *thread;
 968         struct dma_chan *chan = dtc->chan;
 969         char *op;
 970         unsigned int i;
 971
 972         if (type == DMA_MEMCPY)
 973                 op = "copy";
 974         else if (type == DMA_MEMSET)
 975                 op = "set";
 976         else if (type == DMA_XOR)
 977                 op = "xor";
 978         else if (type == DMA_PQ)
 979                 op = "pq";
 980         else
 981                 return -EINVAL;
 982
 983         for (i = 0; i < params->threads_per_chan; i++) {
 984                 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
 985                 if (!thread) {
 986                         pr_warn("No memory for %s-%s%u\n",
 987                                 dma_chan_name(chan), op, i);
 988                         break;
 989                 }
 990                 thread->info = info;
 991                 thread->chan = dtc->chan;
 992                 thread->type = type;
 993                 thread->test_done.wait = &thread->done_wait;
 994                 init_waitqueue_head(&thread->done_wait);
 995                 smp_wmb();
 996                 thread->task = kthread_create(dmatest_func, thread, "%s-%s%u",
 997                                 dma_chan_name(chan), op, i);
 998                 if (IS_ERR(thread->task)) {
 999                         pr_warn("Failed to create thread %s-%s%u\n",
1000                                 dma_chan_name(chan), op, i);
1001                         kfree(thread);
1002                         break;
1003                 }
1004
1005                 /* srcbuf and dstbuf are allocated by the thread itself */
1006                 get_task_struct(thread->task);
1007                 list_add_tail(&thread->node, &dtc->threads);
1008                 thread->pending = true;
1009         }
1010
1011         return i;
1012 }
1013
1014 static int dmatest_add_channel(struct dmatest_info *info,
1015                 struct dma_chan *chan)
1016 {
1017         struct dmatest_chan     *dtc;
1018         struct dma_device       *dma_dev = chan->device;
1019         unsigned int            thread_count = 0;
1020         int cnt;
1021
1022         dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
1023         if (!dtc) {
1024                 pr_warn("No memory for %s\n", dma_chan_name(chan));
1025                 return -ENOMEM;
1026         }
1027
1028         dtc->chan = chan;
1029         INIT_LIST_HEAD(&dtc->threads);
1030
1031         if (dma_has_cap(DMA_COMPLETION_NO_ORDER, dma_dev->cap_mask) &&
1032             info->params.polled) {
1033                 info->params.polled = false;
1034                 pr_warn("DMA_COMPLETION_NO_ORDER, polled disabled\n");
1035         }
1036
1037         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1038                 if (dmatest == 0) {
1039                         cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
1040                         thread_count += cnt > 0 ? cnt : 0;
1041                 }
1042         }
1043
1044         if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
1045                 if (dmatest == 1) {
1046                         cnt = dmatest_add_threads(info, dtc, DMA_MEMSET);
1047                         thread_count += cnt > 0 ? cnt : 0;
1048                 }
1049         }
1050
1051         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1052                 cnt = dmatest_add_threads(info, dtc, DMA_XOR);
1053                 thread_count += cnt > 0 ? cnt : 0;
1054         }
1055         if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1056                 cnt = dmatest_add_threads(info, dtc, DMA_PQ);
1057                 thread_count += cnt > 0 ? cnt : 0;
1058         }
1059
1060         pr_info("Added %u threads using %s\n",
1061                 thread_count, dma_chan_name(chan));
1062
1063         list_add_tail(&dtc->node, &info->channels);
1064         info->nr_channels++;
1065
1066         return 0;
1067 }
1068
1069 static bool filter(struct dma_chan *chan, void *param)
1070 {
1071         return dmatest_match_channel(param, chan) && dmatest_match_device(param, chan->device);
1072 }
1073
1074 static void request_channels(struct dmatest_info *info,
1075                              enum dma_transaction_type type)
1076 {
1077         dma_cap_mask_t mask;
1078
1079         dma_cap_zero(mask);
1080         dma_cap_set(type, mask);
1081         for (;;) {
1082                 struct dmatest_params *params = &info->params;
1083                 struct dma_chan *chan;
1084
1085                 chan = dma_request_channel(mask, filter, params);
1086                 if (chan) {
1087                         if (dmatest_add_channel(info, chan)) {
1088                                 dma_release_channel(chan);
1089                                 break; /* add_channel failed, punt */
1090                         }
1091                 } else
1092                         break; /* no more channels available */
1093                 if (params->max_channels &&
1094                     info->nr_channels >= params->max_channels)
1095                         break; /* we have all we need */
1096         }
1097 }
1098
1099 static void add_threaded_test(struct dmatest_info *info)
1100 {
1101         struct dmatest_params *params = &info->params;
1102
1103         /* Copy test parameters */
1104         params->buf_size = test_buf_size;
1105         strlcpy(params->channel, strim(test_channel), sizeof(params->channel));
1106         strlcpy(params->device, strim(test_device), sizeof(params->device));
1107         params->threads_per_chan = threads_per_chan;
1108         params->max_channels = max_channels;
1109         params->iterations = iterations;
1110         params->xor_sources = xor_sources;
1111         params->pq_sources = pq_sources;
1112         params->timeout = timeout;
1113         params->noverify = noverify;
1114         params->norandom = norandom;
1115         params->alignment = alignment;
1116         params->transfer_size = transfer_size;
1117         params->polled = polled;
1118
1119         request_channels(info, DMA_MEMCPY);
1120         request_channels(info, DMA_MEMSET);
1121         request_channels(info, DMA_XOR);
1122         request_channels(info, DMA_PQ);
1123 }
1124
1125 static void run_pending_tests(struct dmatest_info *info)
1126 {
1127         struct dmatest_chan *dtc;
1128         unsigned int thread_count = 0;
1129
1130         list_for_each_entry(dtc, &info->channels, node) {
1131                 struct dmatest_thread *thread;
1132
1133                 thread_count = 0;
1134                 list_for_each_entry(thread, &dtc->threads, node) {
1135                         wake_up_process(thread->task);
1136                         thread_count++;
1137                 }
1138                 pr_info("Started %u threads using %s\n",
1139                         thread_count, dma_chan_name(dtc->chan));
1140         }
1141 }
1142
1143 static void stop_threaded_test(struct dmatest_info *info)
1144 {
1145         struct dmatest_chan *dtc, *_dtc;
1146         struct dma_chan *chan;
1147
1148         list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
1149                 list_del(&dtc->node);
1150                 chan = dtc->chan;
1151                 dmatest_cleanup_channel(dtc);
1152                 pr_debug("dropped channel %s\n", dma_chan_name(chan));
1153                 dma_release_channel(chan);
1154         }
1155
1156         info->nr_channels = 0;
1157 }
1158
1159 static void start_threaded_tests(struct dmatest_info *info)
1160 {
1161         /* we might be called early to set run=, defer running until all
1162          * parameters have been evaluated
1163          */
1164         if (!info->did_init)
1165                 return;
1166
1167         run_pending_tests(info);
1168 }
1169
1170 static int dmatest_run_get(char *val, const struct kernel_param *kp)
1171 {
1172         struct dmatest_info *info = &test_info;
1173
1174         mutex_lock(&info->lock);
1175         if (is_threaded_test_run(info)) {
1176                 dmatest_run = true;
1177         } else {
1178                 if (!is_threaded_test_pending(info))
1179                         stop_threaded_test(info);
1180                 dmatest_run = false;
1181         }
1182         mutex_unlock(&info->lock);
1183
1184         return param_get_bool(val, kp);
1185 }
1186
1187 static int dmatest_run_set(const char *val, const struct kernel_param *kp)
1188 {
1189         struct dmatest_info *info = &test_info;
1190         int ret;
1191
1192         mutex_lock(&info->lock);
1193         ret = param_set_bool(val, kp);
1194         if (ret) {
1195                 mutex_unlock(&info->lock);
1196                 return ret;
1197         } else if (dmatest_run) {
1198                 if (!is_threaded_test_pending(info)) {
1199                         /*
1200                          * We have nothing to run. This can be due to:
1201                          */
1202                         ret = info->last_error;
1203                         if (ret) {
1204                                 /* 1) Misconfiguration */
1205                                 pr_err("Channel misconfigured, can't continue\n");
1206                                 mutex_unlock(&info->lock);
1207                                 return ret;
1208                         } else {
1209                                 /* 2) We rely on defaults */
1210                                 pr_info("No channels configured, continue with any\n");
1211                                 if (!is_threaded_test_run(info))
1212                                         stop_threaded_test(info);
1213                                 add_threaded_test(info);
1214                         }
1215                 }
1216                 start_threaded_tests(info);
1217         } else {
1218                 stop_threaded_test(info);
1219         }
1220
1221         mutex_unlock(&info->lock);
1222
1223         return ret;
1224 }
1225
1226 static int dmatest_chan_set(const char *val, const struct kernel_param *kp)
1227 {
1228         struct dmatest_info *info = &test_info;
1229         struct dmatest_chan *dtc;
1230         char chan_reset_val[20];
1231         int ret;
1232
1233         mutex_lock(&info->lock);
1234         ret = param_set_copystring(val, kp);
1235         if (ret) {
1236                 mutex_unlock(&info->lock);
1237                 return ret;
1238         }
1239         /*Clear any previously run threads */
1240         if (!is_threaded_test_run(info) && !is_threaded_test_pending(info))
1241                 stop_threaded_test(info);
1242         /* Reject channels that are already registered */
1243         if (is_threaded_test_pending(info)) {
1244                 list_for_each_entry(dtc, &info->channels, node) {
1245                         if (strcmp(dma_chan_name(dtc->chan),
1246                                    strim(test_channel)) == 0) {
1247                                 dtc = list_last_entry(&info->channels,
1248                                                       struct dmatest_chan,
1249                                                       node);
1250                                 strlcpy(chan_reset_val,
1251                                         dma_chan_name(dtc->chan),
1252                                         sizeof(chan_reset_val));
1253                                 ret = -EBUSY;
1254                                 goto add_chan_err;
1255                         }
1256                 }
1257         }
1258
1259         add_threaded_test(info);
1260
1261         /* Check if channel was added successfully */
1262         if (!list_empty(&info->channels)) {
1263                 /*
1264                  * if new channel was not successfully added, revert the
1265                  * "test_channel" string to the name of the last successfully
1266                  * added channel. exception for when users issues empty string
1267                  * to channel parameter.
1268                  */
1269                 dtc = list_last_entry(&info->channels, struct dmatest_chan, node);
1270                 if ((strcmp(dma_chan_name(dtc->chan), strim(test_channel)) != 0)
1271                     && (strcmp("", strim(test_channel)) != 0)) {
1272                         ret = -EINVAL;
1273                         strlcpy(chan_reset_val, dma_chan_name(dtc->chan),
1274                                 sizeof(chan_reset_val));
1275                         goto add_chan_err;
1276                 }
1277
1278         } else {
1279                 /* Clear test_channel if no channels were added successfully */
1280                 strlcpy(chan_reset_val, "", sizeof(chan_reset_val));
1281                 ret = -EBUSY;
1282                 goto add_chan_err;
1283         }
1284
1285         info->last_error = ret;
1286         mutex_unlock(&info->lock);
1287
1288         return ret;
1289
1290 add_chan_err:
1291         param_set_copystring(chan_reset_val, kp);
1292         info->last_error = ret;
1293         mutex_unlock(&info->lock);
1294
1295         return ret;
1296 }
1297
1298 static int dmatest_chan_get(char *val, const struct kernel_param *kp)
1299 {
1300         struct dmatest_info *info = &test_info;
1301
1302         mutex_lock(&info->lock);
1303         if (!is_threaded_test_run(info) && !is_threaded_test_pending(info)) {
1304                 stop_threaded_test(info);
1305                 strlcpy(test_channel, "", sizeof(test_channel));
1306         }
1307         mutex_unlock(&info->lock);
1308
1309         return param_get_string(val, kp);
1310 }
1311
1312 static int dmatest_test_list_get(char *val, const struct kernel_param *kp)
1313 {
1314         struct dmatest_info *info = &test_info;
1315         struct dmatest_chan *dtc;
1316         unsigned int thread_count = 0;
1317
1318         list_for_each_entry(dtc, &info->channels, node) {
1319                 struct dmatest_thread *thread;
1320
1321                 thread_count = 0;
1322                 list_for_each_entry(thread, &dtc->threads, node) {
1323                         thread_count++;
1324                 }
1325                 pr_info("%u threads using %s\n",
1326                         thread_count, dma_chan_name(dtc->chan));
1327         }
1328
1329         return 0;
1330 }
1331
1332 static int __init dmatest_init(void)
1333 {
1334         struct dmatest_info *info = &test_info;
1335         struct dmatest_params *params = &info->params;
1336
1337         if (dmatest_run) {
1338                 mutex_lock(&info->lock);
1339                 add_threaded_test(info);
1340                 run_pending_tests(info);
1341                 mutex_unlock(&info->lock);
1342         }
1343
1344         if (params->iterations && wait)
1345                 wait_event(thread_wait, !is_threaded_test_run(info));
1346
1347         /* module parameters are stable, inittime tests are started,
1348          * let userspace take over 'run' control
1349          */
1350         info->did_init = true;
1351
1352         return 0;
1353 }
1354 /* when compiled-in wait for drivers to load first */
1355 late_initcall(dmatest_init);
1356
1357 static void __exit dmatest_exit(void)
1358 {
1359         struct dmatest_info *info = &test_info;
1360
1361         mutex_lock(&info->lock);
1362         stop_threaded_test(info);
1363         mutex_unlock(&info->lock);
1364 }
1365 module_exit(dmatest_exit);
1366
1367 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1368 MODULE_LICENSE("GPL v2");