drivers/gpu/drm/i915/selftests/i915_request.c

   1 /*
   2  * Copyright © 2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include <linux/prime_numbers.h>
  26
  27 #include "../i915_selftest.h"
  28
  29 #include "mock_context.h"
  30 #include "mock_gem_device.h"
  31
  32 static int igt_add_request(void *arg)
  33 {
  34         struct drm_i915_private *i915 = arg;
  35         struct i915_request *request;
  36         int err = -ENOMEM;
  37
  38         /* Basic preliminary test to create a request and let it loose! */
  39
  40         mutex_lock(&i915->drm.struct_mutex);
  41         request = mock_request(i915->engine[RCS],
  42                                i915->kernel_context,
  43                                HZ / 10);
  44         if (!request)
  45                 goto out_unlock;
  46
  47         i915_request_add(request);
  48
  49         err = 0;
  50 out_unlock:
  51         mutex_unlock(&i915->drm.struct_mutex);
  52         return err;
  53 }
  54
  55 static int igt_wait_request(void *arg)
  56 {
  57         const long T = HZ / 4;
  58         struct drm_i915_private *i915 = arg;
  59         struct i915_request *request;
  60         int err = -EINVAL;
  61
  62         /* Submit a request, then wait upon it */
  63
  64         mutex_lock(&i915->drm.struct_mutex);
  65         request = mock_request(i915->engine[RCS], i915->kernel_context, T);
  66         if (!request) {
  67                 err = -ENOMEM;
  68                 goto out_unlock;
  69         }
  70
  71         if (i915_request_wait(request, I915_WAIT_LOCKED, 0) != -ETIME) {
  72                 pr_err("request wait (busy query) succeeded (expected timeout before submit!)\n");
  73                 goto out_unlock;
  74         }
  75
  76         if (i915_request_wait(request, I915_WAIT_LOCKED, T) != -ETIME) {
  77                 pr_err("request wait succeeded (expected timeout before submit!)\n");
  78                 goto out_unlock;
  79         }
  80
  81         if (i915_request_completed(request)) {
  82                 pr_err("request completed before submit!!\n");
  83                 goto out_unlock;
  84         }
  85
  86         i915_request_add(request);
  87
  88         if (i915_request_wait(request, I915_WAIT_LOCKED, 0) != -ETIME) {
  89                 pr_err("request wait (busy query) succeeded (expected timeout after submit!)\n");
  90                 goto out_unlock;
  91         }
  92
  93         if (i915_request_completed(request)) {
  94                 pr_err("request completed immediately!\n");
  95                 goto out_unlock;
  96         }
  97
  98         if (i915_request_wait(request, I915_WAIT_LOCKED, T / 2) != -ETIME) {
  99                 pr_err("request wait succeeded (expected timeout!)\n");
 100                 goto out_unlock;
 101         }
 102
 103         if (i915_request_wait(request, I915_WAIT_LOCKED, T) == -ETIME) {
 104                 pr_err("request wait timed out!\n");
 105                 goto out_unlock;
 106         }
 107
 108         if (!i915_request_completed(request)) {
 109                 pr_err("request not complete after waiting!\n");
 110                 goto out_unlock;
 111         }
 112
 113         if (i915_request_wait(request, I915_WAIT_LOCKED, T) == -ETIME) {
 114                 pr_err("request wait timed out when already complete!\n");
 115                 goto out_unlock;
 116         }
 117
 118         err = 0;
 119 out_unlock:
 120         mock_device_flush(i915);
 121         mutex_unlock(&i915->drm.struct_mutex);
 122         return err;
 123 }
 124
 125 static int igt_fence_wait(void *arg)
 126 {
 127         const long T = HZ / 4;
 128         struct drm_i915_private *i915 = arg;
 129         struct i915_request *request;
 130         int err = -EINVAL;
 131
 132         /* Submit a request, treat it as a fence and wait upon it */
 133
 134         mutex_lock(&i915->drm.struct_mutex);
 135         request = mock_request(i915->engine[RCS], i915->kernel_context, T);
 136         if (!request) {
 137                 err = -ENOMEM;
 138                 goto out_locked;
 139         }
 140         mutex_unlock(&i915->drm.struct_mutex); /* safe as we are single user */
 141
 142         if (dma_fence_wait_timeout(&request->fence, false, T) != -ETIME) {
 143                 pr_err("fence wait success before submit (expected timeout)!\n");
 144                 goto out_device;
 145         }
 146
 147         mutex_lock(&i915->drm.struct_mutex);
 148         i915_request_add(request);
 149         mutex_unlock(&i915->drm.struct_mutex);
 150
 151         if (dma_fence_is_signaled(&request->fence)) {
 152                 pr_err("fence signaled immediately!\n");
 153                 goto out_device;
 154         }
 155
 156         if (dma_fence_wait_timeout(&request->fence, false, T / 2) != -ETIME) {
 157                 pr_err("fence wait success after submit (expected timeout)!\n");
 158                 goto out_device;
 159         }
 160
 161         if (dma_fence_wait_timeout(&request->fence, false, T) <= 0) {
 162                 pr_err("fence wait timed out (expected success)!\n");
 163                 goto out_device;
 164         }
 165
 166         if (!dma_fence_is_signaled(&request->fence)) {
 167                 pr_err("fence unsignaled after waiting!\n");
 168                 goto out_device;
 169         }
 170
 171         if (dma_fence_wait_timeout(&request->fence, false, T) <= 0) {
 172                 pr_err("fence wait timed out when complete (expected success)!\n");
 173                 goto out_device;
 174         }
 175
 176         err = 0;
 177 out_device:
 178         mutex_lock(&i915->drm.struct_mutex);
 179 out_locked:
 180         mock_device_flush(i915);
 181         mutex_unlock(&i915->drm.struct_mutex);
 182         return err;
 183 }
 184
 185 static int igt_request_rewind(void *arg)
 186 {
 187         struct drm_i915_private *i915 = arg;
 188         struct i915_request *request, *vip;
 189         struct i915_gem_context *ctx[2];
 190         int err = -EINVAL;
 191
 192         mutex_lock(&i915->drm.struct_mutex);
 193         ctx[0] = mock_context(i915, "A");
 194         request = mock_request(i915->engine[RCS], ctx[0], 2 * HZ);
 195         if (!request) {
 196                 err = -ENOMEM;
 197                 goto err_context_0;
 198         }
 199
 200         i915_request_get(request);
 201         i915_request_add(request);
 202
 203         ctx[1] = mock_context(i915, "B");
 204         vip = mock_request(i915->engine[RCS], ctx[1], 0);
 205         if (!vip) {
 206                 err = -ENOMEM;
 207                 goto err_context_1;
 208         }
 209
 210         /* Simulate preemption by manual reordering */
 211         if (!mock_cancel_request(request)) {
 212                 pr_err("failed to cancel request (already executed)!\n");
 213                 i915_request_add(vip);
 214                 goto err_context_1;
 215         }
 216         i915_request_get(vip);
 217         i915_request_add(vip);
 218         rcu_read_lock();
 219         request->engine->submit_request(request);
 220         rcu_read_unlock();
 221
 222         mutex_unlock(&i915->drm.struct_mutex);
 223
 224         if (i915_request_wait(vip, 0, HZ) == -ETIME) {
 225                 pr_err("timed out waiting for high priority request, vip.seqno=%d, current seqno=%d\n",
 226                        vip->global_seqno, intel_engine_get_seqno(i915->engine[RCS]));
 227                 goto err;
 228         }
 229
 230         if (i915_request_completed(request)) {
 231                 pr_err("low priority request already completed\n");
 232                 goto err;
 233         }
 234
 235         err = 0;
 236 err:
 237         i915_request_put(vip);
 238         mutex_lock(&i915->drm.struct_mutex);
 239 err_context_1:
 240         mock_context_close(ctx[1]);
 241         i915_request_put(request);
 242 err_context_0:
 243         mock_context_close(ctx[0]);
 244         mock_device_flush(i915);
 245         mutex_unlock(&i915->drm.struct_mutex);
 246         return err;
 247 }
 248
 249 int i915_request_mock_selftests(void)
 250 {
 251         static const struct i915_subtest tests[] = {
 252                 SUBTEST(igt_add_request),
 253                 SUBTEST(igt_wait_request),
 254                 SUBTEST(igt_fence_wait),
 255                 SUBTEST(igt_request_rewind),
 256         };
 257         struct drm_i915_private *i915;
 258         int err;
 259
 260         i915 = mock_gem_device();
 261         if (!i915)
 262                 return -ENOMEM;
 263
 264         err = i915_subtests(tests, i915);
 265         drm_dev_put(&i915->drm);
 266
 267         return err;
 268 }
 269
 270 struct live_test {
 271         struct drm_i915_private *i915;
 272         const char *func;
 273         const char *name;
 274
 275         unsigned int reset_count;
 276 };
 277
 278 static int begin_live_test(struct live_test *t,
 279                            struct drm_i915_private *i915,
 280                            const char *func,
 281                            const char *name)
 282 {
 283         int err;
 284
 285         t->i915 = i915;
 286         t->func = func;
 287         t->name = name;
 288
 289         err = i915_gem_wait_for_idle(i915,
 290                                      I915_WAIT_LOCKED,
 291                                      MAX_SCHEDULE_TIMEOUT);
 292         if (err) {
 293                 pr_err("%s(%s): failed to idle before, with err=%d!",
 294                        func, name, err);
 295                 return err;
 296         }
 297
 298         i915->gpu_error.missed_irq_rings = 0;
 299         t->reset_count = i915_reset_count(&i915->gpu_error);
 300
 301         return 0;
 302 }
 303
 304 static int end_live_test(struct live_test *t)
 305 {
 306         struct drm_i915_private *i915 = t->i915;
 307
 308         i915_retire_requests(i915);
 309
 310         if (wait_for(intel_engines_are_idle(i915), 10)) {
 311                 pr_err("%s(%s): GPU not idle\n", t->func, t->name);
 312                 return -EIO;
 313         }
 314
 315         if (t->reset_count != i915_reset_count(&i915->gpu_error)) {
 316                 pr_err("%s(%s): GPU was reset %d times!\n",
 317                        t->func, t->name,
 318                        i915_reset_count(&i915->gpu_error) - t->reset_count);
 319                 return -EIO;
 320         }
 321
 322         if (i915->gpu_error.missed_irq_rings) {
 323                 pr_err("%s(%s): Missed interrupts on engines %lx\n",
 324                        t->func, t->name, i915->gpu_error.missed_irq_rings);
 325                 return -EIO;
 326         }
 327
 328         return 0;
 329 }
 330
 331 static int live_nop_request(void *arg)
 332 {
 333         struct drm_i915_private *i915 = arg;
 334         struct intel_engine_cs *engine;
 335         struct live_test t;
 336         unsigned int id;
 337         int err = -ENODEV;
 338
 339         /* Submit various sized batches of empty requests, to each engine
 340          * (individually), and wait for the batch to complete. We can check
 341          * the overhead of submitting requests to the hardware.
 342          */
 343
 344         mutex_lock(&i915->drm.struct_mutex);
 345
 346         for_each_engine(engine, i915, id) {
 347                 struct i915_request *request = NULL;
 348                 unsigned long n, prime;
 349                 IGT_TIMEOUT(end_time);
 350                 ktime_t times[2] = {};
 351
 352                 err = begin_live_test(&t, i915, __func__, engine->name);
 353                 if (err)
 354                         goto out_unlock;
 355
 356                 for_each_prime_number_from(prime, 1, 8192) {
 357                         times[1] = ktime_get_raw();
 358
 359                         for (n = 0; n < prime; n++) {
 360                                 request = i915_request_alloc(engine,
 361                                                              i915->kernel_context);
 362                                 if (IS_ERR(request)) {
 363                                         err = PTR_ERR(request);
 364                                         goto out_unlock;
 365                                 }
 366
 367                                 /* This space is left intentionally blank.
 368                                  *
 369                                  * We do not actually want to perform any
 370                                  * action with this request, we just want
 371                                  * to measure the latency in allocation
 372                                  * and submission of our breadcrumbs -
 373                                  * ensuring that the bare request is sufficient
 374                                  * for the system to work (i.e. proper HEAD
 375                                  * tracking of the rings, interrupt handling,
 376                                  * etc). It also gives us the lowest bounds
 377                                  * for latency.
 378                                  */
 379
 380                                 i915_request_add(request);
 381                         }
 382                         i915_request_wait(request,
 383                                           I915_WAIT_LOCKED,
 384                                           MAX_SCHEDULE_TIMEOUT);
 385
 386                         times[1] = ktime_sub(ktime_get_raw(), times[1]);
 387                         if (prime == 1)
 388                                 times[0] = times[1];
 389
 390                         if (__igt_timeout(end_time, NULL))
 391                                 break;
 392                 }
 393
 394                 err = end_live_test(&t);
 395                 if (err)
 396                         goto out_unlock;
 397
 398                 pr_info("Request latencies on %s: 1 = %lluns, %lu = %lluns\n",
 399                         engine->name,
 400                         ktime_to_ns(times[0]),
 401                         prime, div64_u64(ktime_to_ns(times[1]), prime));
 402         }
 403
 404 out_unlock:
 405         mutex_unlock(&i915->drm.struct_mutex);
 406         return err;
 407 }
 408
 409 static struct i915_vma *empty_batch(struct drm_i915_private *i915)
 410 {
 411         struct drm_i915_gem_object *obj;
 412         struct i915_vma *vma;
 413         u32 *cmd;
 414         int err;
 415
 416         obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
 417         if (IS_ERR(obj))
 418                 return ERR_CAST(obj);
 419
 420         cmd = i915_gem_object_pin_map(obj, I915_MAP_WB);
 421         if (IS_ERR(cmd)) {
 422                 err = PTR_ERR(cmd);
 423                 goto err;
 424         }
 425
 426         *cmd = MI_BATCH_BUFFER_END;
 427         i915_gem_chipset_flush(i915);
 428
 429         i915_gem_object_unpin_map(obj);
 430
 431         err = i915_gem_object_set_to_gtt_domain(obj, false);
 432         if (err)
 433                 goto err;
 434
 435         vma = i915_vma_instance(obj, &i915->ggtt.vm, NULL);
 436         if (IS_ERR(vma)) {
 437                 err = PTR_ERR(vma);
 438                 goto err;
 439         }
 440
 441         err = i915_vma_pin(vma, 0, 0, PIN_USER | PIN_GLOBAL);
 442         if (err)
 443                 goto err;
 444
 445         return vma;
 446
 447 err:
 448         i915_gem_object_put(obj);
 449         return ERR_PTR(err);
 450 }
 451
 452 static struct i915_request *
 453 empty_request(struct intel_engine_cs *engine,
 454               struct i915_vma *batch)
 455 {
 456         struct i915_request *request;
 457         int err;
 458
 459         request = i915_request_alloc(engine, engine->i915->kernel_context);
 460         if (IS_ERR(request))
 461                 return request;
 462
 463         err = engine->emit_bb_start(request,
 464                                     batch->node.start,
 465                                     batch->node.size,
 466                                     I915_DISPATCH_SECURE);
 467         if (err)
 468                 goto out_request;
 469
 470 out_request:
 471         i915_request_add(request);
 472         return err ? ERR_PTR(err) : request;
 473 }
 474
 475 static int live_empty_request(void *arg)
 476 {
 477         struct drm_i915_private *i915 = arg;
 478         struct intel_engine_cs *engine;
 479         struct live_test t;
 480         struct i915_vma *batch;
 481         unsigned int id;
 482         int err = 0;
 483
 484         /* Submit various sized batches of empty requests, to each engine
 485          * (individually), and wait for the batch to complete. We can check
 486          * the overhead of submitting requests to the hardware.
 487          */
 488
 489         mutex_lock(&i915->drm.struct_mutex);
 490
 491         batch = empty_batch(i915);
 492         if (IS_ERR(batch)) {
 493                 err = PTR_ERR(batch);
 494                 goto out_unlock;
 495         }
 496
 497         for_each_engine(engine, i915, id) {
 498                 IGT_TIMEOUT(end_time);
 499                 struct i915_request *request;
 500                 unsigned long n, prime;
 501                 ktime_t times[2] = {};
 502
 503                 err = begin_live_test(&t, i915, __func__, engine->name);
 504                 if (err)
 505                         goto out_batch;
 506
 507                 /* Warmup / preload */
 508                 request = empty_request(engine, batch);
 509                 if (IS_ERR(request)) {
 510                         err = PTR_ERR(request);
 511                         goto out_batch;
 512                 }
 513                 i915_request_wait(request,
 514                                   I915_WAIT_LOCKED,
 515                                   MAX_SCHEDULE_TIMEOUT);
 516
 517                 for_each_prime_number_from(prime, 1, 8192) {
 518                         times[1] = ktime_get_raw();
 519
 520                         for (n = 0; n < prime; n++) {
 521                                 request = empty_request(engine, batch);
 522                                 if (IS_ERR(request)) {
 523                                         err = PTR_ERR(request);
 524                                         goto out_batch;
 525                                 }
 526                         }
 527                         i915_request_wait(request,
 528                                           I915_WAIT_LOCKED,
 529                                           MAX_SCHEDULE_TIMEOUT);
 530
 531                         times[1] = ktime_sub(ktime_get_raw(), times[1]);
 532                         if (prime == 1)
 533                                 times[0] = times[1];
 534
 535                         if (__igt_timeout(end_time, NULL))
 536                                 break;
 537                 }
 538
 539                 err = end_live_test(&t);
 540                 if (err)
 541                         goto out_batch;
 542
 543                 pr_info("Batch latencies on %s: 1 = %lluns, %lu = %lluns\n",
 544                         engine->name,
 545                         ktime_to_ns(times[0]),
 546                         prime, div64_u64(ktime_to_ns(times[1]), prime));
 547         }
 548
 549 out_batch:
 550         i915_vma_unpin(batch);
 551         i915_vma_put(batch);
 552 out_unlock:
 553         mutex_unlock(&i915->drm.struct_mutex);
 554         return err;
 555 }
 556
 557 static struct i915_vma *recursive_batch(struct drm_i915_private *i915)
 558 {
 559         struct i915_gem_context *ctx = i915->kernel_context;
 560         struct i915_address_space *vm =
 561                 ctx->ppgtt ? &ctx->ppgtt->vm : &i915->ggtt.vm;
 562         struct drm_i915_gem_object *obj;
 563         const int gen = INTEL_GEN(i915);
 564         struct i915_vma *vma;
 565         u32 *cmd;
 566         int err;
 567
 568         obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
 569         if (IS_ERR(obj))
 570                 return ERR_CAST(obj);
 571
 572         vma = i915_vma_instance(obj, vm, NULL);
 573         if (IS_ERR(vma)) {
 574                 err = PTR_ERR(vma);
 575                 goto err;
 576         }
 577
 578         err = i915_vma_pin(vma, 0, 0, PIN_USER);
 579         if (err)
 580                 goto err;
 581
 582         err = i915_gem_object_set_to_wc_domain(obj, true);
 583         if (err)
 584                 goto err;
 585
 586         cmd = i915_gem_object_pin_map(obj, I915_MAP_WC);
 587         if (IS_ERR(cmd)) {
 588                 err = PTR_ERR(cmd);
 589                 goto err;
 590         }
 591
 592         if (gen >= 8) {
 593                 *cmd++ = MI_BATCH_BUFFER_START | 1 << 8 | 1;
 594                 *cmd++ = lower_32_bits(vma->node.start);
 595                 *cmd++ = upper_32_bits(vma->node.start);
 596         } else if (gen >= 6) {
 597                 *cmd++ = MI_BATCH_BUFFER_START | 1 << 8;
 598                 *cmd++ = lower_32_bits(vma->node.start);
 599         } else {
 600                 *cmd++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT;
 601                 *cmd++ = lower_32_bits(vma->node.start);
 602         }
 603         *cmd++ = MI_BATCH_BUFFER_END; /* terminate early in case of error */
 604         i915_gem_chipset_flush(i915);
 605
 606         i915_gem_object_unpin_map(obj);
 607
 608         return vma;
 609
 610 err:
 611         i915_gem_object_put(obj);
 612         return ERR_PTR(err);
 613 }
 614
 615 static int recursive_batch_resolve(struct i915_vma *batch)
 616 {
 617         u32 *cmd;
 618
 619         cmd = i915_gem_object_pin_map(batch->obj, I915_MAP_WC);
 620         if (IS_ERR(cmd))
 621                 return PTR_ERR(cmd);
 622
 623         *cmd = MI_BATCH_BUFFER_END;
 624         i915_gem_chipset_flush(batch->vm->i915);
 625
 626         i915_gem_object_unpin_map(batch->obj);
 627
 628         return 0;
 629 }
 630
 631 static int live_all_engines(void *arg)
 632 {
 633         struct drm_i915_private *i915 = arg;
 634         struct intel_engine_cs *engine;
 635         struct i915_request *request[I915_NUM_ENGINES];
 636         struct i915_vma *batch;
 637         struct live_test t;
 638         unsigned int id;
 639         int err;
 640
 641         /* Check we can submit requests to all engines simultaneously. We
 642          * send a recursive batch to each engine - checking that we don't
 643          * block doing so, and that they don't complete too soon.
 644          */
 645
 646         mutex_lock(&i915->drm.struct_mutex);
 647
 648         err = begin_live_test(&t, i915, __func__, "");
 649         if (err)
 650                 goto out_unlock;
 651
 652         batch = recursive_batch(i915);
 653         if (IS_ERR(batch)) {
 654                 err = PTR_ERR(batch);
 655                 pr_err("%s: Unable to create batch, err=%d\n", __func__, err);
 656                 goto out_unlock;
 657         }
 658
 659         for_each_engine(engine, i915, id) {
 660                 request[id] = i915_request_alloc(engine, i915->kernel_context);
 661                 if (IS_ERR(request[id])) {
 662                         err = PTR_ERR(request[id]);
 663                         pr_err("%s: Request allocation failed with err=%d\n",
 664                                __func__, err);
 665                         goto out_request;
 666                 }
 667
 668                 err = engine->emit_bb_start(request[id],
 669                                             batch->node.start,
 670                                             batch->node.size,
 671                                             0);
 672                 GEM_BUG_ON(err);
 673                 request[id]->batch = batch;
 674
 675                 if (!i915_gem_object_has_active_reference(batch->obj)) {
 676                         i915_gem_object_get(batch->obj);
 677                         i915_gem_object_set_active_reference(batch->obj);
 678                 }
 679
 680                 err = i915_vma_move_to_active(batch, request[id], 0);
 681                 GEM_BUG_ON(err);
 682
 683                 i915_request_get(request[id]);
 684                 i915_request_add(request[id]);
 685         }
 686
 687         for_each_engine(engine, i915, id) {
 688                 if (i915_request_completed(request[id])) {
 689                         pr_err("%s(%s): request completed too early!\n",
 690                                __func__, engine->name);
 691                         err = -EINVAL;
 692                         goto out_request;
 693                 }
 694         }
 695
 696         err = recursive_batch_resolve(batch);
 697         if (err) {
 698                 pr_err("%s: failed to resolve batch, err=%d\n", __func__, err);
 699                 goto out_request;
 700         }
 701
 702         for_each_engine(engine, i915, id) {
 703                 long timeout;
 704
 705                 timeout = i915_request_wait(request[id],
 706                                             I915_WAIT_LOCKED,
 707                                             MAX_SCHEDULE_TIMEOUT);
 708                 if (timeout < 0) {
 709                         err = timeout;
 710                         pr_err("%s: error waiting for request on %s, err=%d\n",
 711                                __func__, engine->name, err);
 712                         goto out_request;
 713                 }
 714
 715                 GEM_BUG_ON(!i915_request_completed(request[id]));
 716                 i915_request_put(request[id]);
 717                 request[id] = NULL;
 718         }
 719
 720         err = end_live_test(&t);
 721
 722 out_request:
 723         for_each_engine(engine, i915, id)
 724                 if (request[id])
 725                         i915_request_put(request[id]);
 726         i915_vma_unpin(batch);
 727         i915_vma_put(batch);
 728 out_unlock:
 729         mutex_unlock(&i915->drm.struct_mutex);
 730         return err;
 731 }
 732
 733 static int live_sequential_engines(void *arg)
 734 {
 735         struct drm_i915_private *i915 = arg;
 736         struct i915_request *request[I915_NUM_ENGINES] = {};
 737         struct i915_request *prev = NULL;
 738         struct intel_engine_cs *engine;
 739         struct live_test t;
 740         unsigned int id;
 741         int err;
 742
 743         /* Check we can submit requests to all engines sequentially, such
 744          * that each successive request waits for the earlier ones. This
 745          * tests that we don't execute requests out of order, even though
 746          * they are running on independent engines.
 747          */
 748
 749         mutex_lock(&i915->drm.struct_mutex);
 750
 751         err = begin_live_test(&t, i915, __func__, "");
 752         if (err)
 753                 goto out_unlock;
 754
 755         for_each_engine(engine, i915, id) {
 756                 struct i915_vma *batch;
 757
 758                 batch = recursive_batch(i915);
 759                 if (IS_ERR(batch)) {
 760                         err = PTR_ERR(batch);
 761                         pr_err("%s: Unable to create batch for %s, err=%d\n",
 762                                __func__, engine->name, err);
 763                         goto out_unlock;
 764                 }
 765
 766                 request[id] = i915_request_alloc(engine, i915->kernel_context);
 767                 if (IS_ERR(request[id])) {
 768                         err = PTR_ERR(request[id]);
 769                         pr_err("%s: Request allocation failed for %s with err=%d\n",
 770                                __func__, engine->name, err);
 771                         goto out_request;
 772                 }
 773
 774                 if (prev) {
 775                         err = i915_request_await_dma_fence(request[id],
 776                                                            &prev->fence);
 777                         if (err) {
 778                                 i915_request_add(request[id]);
 779                                 pr_err("%s: Request await failed for %s with err=%d\n",
 780                                        __func__, engine->name, err);
 781                                 goto out_request;
 782                         }
 783                 }
 784
 785                 err = engine->emit_bb_start(request[id],
 786                                             batch->node.start,
 787                                             batch->node.size,
 788                                             0);
 789                 GEM_BUG_ON(err);
 790                 request[id]->batch = batch;
 791
 792                 err = i915_vma_move_to_active(batch, request[id], 0);
 793                 GEM_BUG_ON(err);
 794
 795                 i915_gem_object_set_active_reference(batch->obj);
 796                 i915_vma_get(batch);
 797
 798                 i915_request_get(request[id]);
 799                 i915_request_add(request[id]);
 800
 801                 prev = request[id];
 802         }
 803
 804         for_each_engine(engine, i915, id) {
 805                 long timeout;
 806
 807                 if (i915_request_completed(request[id])) {
 808                         pr_err("%s(%s): request completed too early!\n",
 809                                __func__, engine->name);
 810                         err = -EINVAL;
 811                         goto out_request;
 812                 }
 813
 814                 err = recursive_batch_resolve(request[id]->batch);
 815                 if (err) {
 816                         pr_err("%s: failed to resolve batch, err=%d\n",
 817                                __func__, err);
 818                         goto out_request;
 819                 }
 820
 821                 timeout = i915_request_wait(request[id],
 822                                             I915_WAIT_LOCKED,
 823                                             MAX_SCHEDULE_TIMEOUT);
 824                 if (timeout < 0) {
 825                         err = timeout;
 826                         pr_err("%s: error waiting for request on %s, err=%d\n",
 827                                __func__, engine->name, err);
 828                         goto out_request;
 829                 }
 830
 831                 GEM_BUG_ON(!i915_request_completed(request[id]));
 832         }
 833
 834         err = end_live_test(&t);
 835
 836 out_request:
 837         for_each_engine(engine, i915, id) {
 838                 u32 *cmd;
 839
 840                 if (!request[id])
 841                         break;
 842
 843                 cmd = i915_gem_object_pin_map(request[id]->batch->obj,
 844                                               I915_MAP_WC);
 845                 if (!IS_ERR(cmd)) {
 846                         *cmd = MI_BATCH_BUFFER_END;
 847                         i915_gem_chipset_flush(i915);
 848
 849                         i915_gem_object_unpin_map(request[id]->batch->obj);
 850                 }
 851
 852                 i915_vma_put(request[id]->batch);
 853                 i915_request_put(request[id]);
 854         }
 855 out_unlock:
 856         mutex_unlock(&i915->drm.struct_mutex);
 857         return err;
 858 }
 859
 860 int i915_request_live_selftests(struct drm_i915_private *i915)
 861 {
 862         static const struct i915_subtest tests[] = {
 863                 SUBTEST(live_nop_request),
 864                 SUBTEST(live_all_engines),
 865                 SUBTEST(live_sequential_engines),
 866                 SUBTEST(live_empty_request),
 867         };
 868
 869         if (i915_terminally_wedged(&i915->gpu_error))
 870                 return 0;
 871
 872         return i915_subtests(tests, i915);
 873 }