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

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright © 2018 Intel Corporation
   5  */
   6
   7 #include "../i915_selftest.h"
   8
   9 #include "igt_flush_test.h"
  10 #include "igt_reset.h"
  11 #include "igt_spinner.h"
  12 #include "igt_wedge_me.h"
  13 #include "mock_context.h"
  14
  15 static struct drm_i915_gem_object *
  16 read_nonprivs(struct i915_gem_context *ctx, struct intel_engine_cs *engine)
  17 {
  18         struct drm_i915_gem_object *result;
  19         struct i915_request *rq;
  20         struct i915_vma *vma;
  21         const u32 base = engine->mmio_base;
  22         u32 srm, *cs;
  23         int err;
  24         int i;
  25
  26         result = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
  27         if (IS_ERR(result))
  28                 return result;
  29
  30         i915_gem_object_set_cache_level(result, I915_CACHE_LLC);
  31
  32         cs = i915_gem_object_pin_map(result, I915_MAP_WB);
  33         if (IS_ERR(cs)) {
  34                 err = PTR_ERR(cs);
  35                 goto err_obj;
  36         }
  37         memset(cs, 0xc5, PAGE_SIZE);
  38         i915_gem_object_unpin_map(result);
  39
  40         vma = i915_vma_instance(result, &engine->i915->ggtt.vm, NULL);
  41         if (IS_ERR(vma)) {
  42                 err = PTR_ERR(vma);
  43                 goto err_obj;
  44         }
  45
  46         err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
  47         if (err)
  48                 goto err_obj;
  49
  50         intel_runtime_pm_get(engine->i915);
  51         rq = i915_request_alloc(engine, ctx);
  52         intel_runtime_pm_put(engine->i915);
  53         if (IS_ERR(rq)) {
  54                 err = PTR_ERR(rq);
  55                 goto err_pin;
  56         }
  57
  58         err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
  59         if (err)
  60                 goto err_req;
  61
  62         srm = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT;
  63         if (INTEL_GEN(ctx->i915) >= 8)
  64                 srm++;
  65
  66         cs = intel_ring_begin(rq, 4 * RING_MAX_NONPRIV_SLOTS);
  67         if (IS_ERR(cs)) {
  68                 err = PTR_ERR(cs);
  69                 goto err_req;
  70         }
  71
  72         for (i = 0; i < RING_MAX_NONPRIV_SLOTS; i++) {
  73                 *cs++ = srm;
  74                 *cs++ = i915_mmio_reg_offset(RING_FORCE_TO_NONPRIV(base, i));
  75                 *cs++ = i915_ggtt_offset(vma) + sizeof(u32) * i;
  76                 *cs++ = 0;
  77         }
  78         intel_ring_advance(rq, cs);
  79
  80         i915_gem_object_get(result);
  81         i915_gem_object_set_active_reference(result);
  82
  83         i915_request_add(rq);
  84         i915_vma_unpin(vma);
  85
  86         return result;
  87
  88 err_req:
  89         i915_request_add(rq);
  90 err_pin:
  91         i915_vma_unpin(vma);
  92 err_obj:
  93         i915_gem_object_put(result);
  94         return ERR_PTR(err);
  95 }
  96
  97 static u32
  98 get_whitelist_reg(const struct intel_engine_cs *engine, unsigned int i)
  99 {
 100         i915_reg_t reg = i < engine->whitelist.count ?
 101                          engine->whitelist.list[i].reg :
 102                          RING_NOPID(engine->mmio_base);
 103
 104         return i915_mmio_reg_offset(reg);
 105 }
 106
 107 static void
 108 print_results(const struct intel_engine_cs *engine, const u32 *results)
 109 {
 110         unsigned int i;
 111
 112         for (i = 0; i < RING_MAX_NONPRIV_SLOTS; i++) {
 113                 u32 expected = get_whitelist_reg(engine, i);
 114                 u32 actual = results[i];
 115
 116                 pr_info("RING_NONPRIV[%d]: expected 0x%08x, found 0x%08x\n",
 117                         i, expected, actual);
 118         }
 119 }
 120
 121 static int check_whitelist(struct i915_gem_context *ctx,
 122                            struct intel_engine_cs *engine)
 123 {
 124         struct drm_i915_gem_object *results;
 125         struct igt_wedge_me wedge;
 126         u32 *vaddr;
 127         int err;
 128         int i;
 129
 130         results = read_nonprivs(ctx, engine);
 131         if (IS_ERR(results))
 132                 return PTR_ERR(results);
 133
 134         err = 0;
 135         igt_wedge_on_timeout(&wedge, ctx->i915, HZ / 5) /* a safety net! */
 136                 err = i915_gem_object_set_to_cpu_domain(results, false);
 137         if (i915_terminally_wedged(&ctx->i915->gpu_error))
 138                 err = -EIO;
 139         if (err)
 140                 goto out_put;
 141
 142         vaddr = i915_gem_object_pin_map(results, I915_MAP_WB);
 143         if (IS_ERR(vaddr)) {
 144                 err = PTR_ERR(vaddr);
 145                 goto out_put;
 146         }
 147
 148         for (i = 0; i < RING_MAX_NONPRIV_SLOTS; i++) {
 149                 u32 expected = get_whitelist_reg(engine, i);
 150                 u32 actual = vaddr[i];
 151
 152                 if (expected != actual) {
 153                         print_results(engine, vaddr);
 154                         pr_err("Invalid RING_NONPRIV[%d], expected 0x%08x, found 0x%08x\n",
 155                                i, expected, actual);
 156
 157                         err = -EINVAL;
 158                         break;
 159                 }
 160         }
 161
 162         i915_gem_object_unpin_map(results);
 163 out_put:
 164         i915_gem_object_put(results);
 165         return err;
 166 }
 167
 168 static int do_device_reset(struct intel_engine_cs *engine)
 169 {
 170         set_bit(I915_RESET_HANDOFF, &engine->i915->gpu_error.flags);
 171         i915_reset(engine->i915, ENGINE_MASK(engine->id), "live_workarounds");
 172         return 0;
 173 }
 174
 175 static int do_engine_reset(struct intel_engine_cs *engine)
 176 {
 177         return i915_reset_engine(engine, "live_workarounds");
 178 }
 179
 180 static int
 181 switch_to_scratch_context(struct intel_engine_cs *engine,
 182                           struct igt_spinner *spin)
 183 {
 184         struct i915_gem_context *ctx;
 185         struct i915_request *rq;
 186         int err = 0;
 187
 188         ctx = kernel_context(engine->i915);
 189         if (IS_ERR(ctx))
 190                 return PTR_ERR(ctx);
 191
 192         intel_runtime_pm_get(engine->i915);
 193
 194         if (spin)
 195                 rq = igt_spinner_create_request(spin, ctx, engine, MI_NOOP);
 196         else
 197                 rq = i915_request_alloc(engine, ctx);
 198
 199         intel_runtime_pm_put(engine->i915);
 200
 201         kernel_context_close(ctx);
 202
 203         if (IS_ERR(rq)) {
 204                 spin = NULL;
 205                 err = PTR_ERR(rq);
 206                 goto err;
 207         }
 208
 209         i915_request_add(rq);
 210
 211         if (spin && !igt_wait_for_spinner(spin, rq)) {
 212                 pr_err("Spinner failed to start\n");
 213                 err = -ETIMEDOUT;
 214         }
 215
 216 err:
 217         if (err && spin)
 218                 igt_spinner_end(spin);
 219
 220         return err;
 221 }
 222
 223 static int check_whitelist_across_reset(struct intel_engine_cs *engine,
 224                                         int (*reset)(struct intel_engine_cs *),
 225                                         const char *name)
 226 {
 227         struct drm_i915_private *i915 = engine->i915;
 228         bool want_spin = reset == do_engine_reset;
 229         struct i915_gem_context *ctx;
 230         struct igt_spinner spin;
 231         int err;
 232
 233         pr_info("Checking %d whitelisted registers (RING_NONPRIV) [%s]\n",
 234                 engine->whitelist.count, name);
 235
 236         if (want_spin) {
 237                 err = igt_spinner_init(&spin, i915);
 238                 if (err)
 239                         return err;
 240         }
 241
 242         ctx = kernel_context(i915);
 243         if (IS_ERR(ctx))
 244                 return PTR_ERR(ctx);
 245
 246         err = check_whitelist(ctx, engine);
 247         if (err) {
 248                 pr_err("Invalid whitelist *before* %s reset!\n", name);
 249                 goto out;
 250         }
 251
 252         err = switch_to_scratch_context(engine, want_spin ? &spin : NULL);
 253         if (err)
 254                 goto out;
 255
 256         intel_runtime_pm_get(i915);
 257         err = reset(engine);
 258         intel_runtime_pm_put(i915);
 259
 260         if (want_spin) {
 261                 igt_spinner_end(&spin);
 262                 igt_spinner_fini(&spin);
 263         }
 264
 265         if (err) {
 266                 pr_err("%s reset failed\n", name);
 267                 goto out;
 268         }
 269
 270         err = check_whitelist(ctx, engine);
 271         if (err) {
 272                 pr_err("Whitelist not preserved in context across %s reset!\n",
 273                        name);
 274                 goto out;
 275         }
 276
 277         kernel_context_close(ctx);
 278
 279         ctx = kernel_context(i915);
 280         if (IS_ERR(ctx))
 281                 return PTR_ERR(ctx);
 282
 283         err = check_whitelist(ctx, engine);
 284         if (err) {
 285                 pr_err("Invalid whitelist *after* %s reset in fresh context!\n",
 286                        name);
 287                 goto out;
 288         }
 289
 290 out:
 291         kernel_context_close(ctx);
 292         return err;
 293 }
 294
 295 static int live_reset_whitelist(void *arg)
 296 {
 297         struct drm_i915_private *i915 = arg;
 298         struct intel_engine_cs *engine = i915->engine[RCS];
 299         int err = 0;
 300
 301         /* If we reset the gpu, we should not lose the RING_NONPRIV */
 302
 303         if (!engine || engine->whitelist.count == 0)
 304                 return 0;
 305
 306         igt_global_reset_lock(i915);
 307
 308         if (intel_has_reset_engine(i915)) {
 309                 err = check_whitelist_across_reset(engine,
 310                                                    do_engine_reset,
 311                                                    "engine");
 312                 if (err)
 313                         goto out;
 314         }
 315
 316         if (intel_has_gpu_reset(i915)) {
 317                 err = check_whitelist_across_reset(engine,
 318                                                    do_device_reset,
 319                                                    "device");
 320                 if (err)
 321                         goto out;
 322         }
 323
 324 out:
 325         igt_global_reset_unlock(i915);
 326         return err;
 327 }
 328
 329 static bool verify_gt_engine_wa(struct drm_i915_private *i915, const char *str)
 330 {
 331         struct intel_engine_cs *engine;
 332         enum intel_engine_id id;
 333         bool ok = true;
 334
 335         ok &= intel_gt_verify_workarounds(i915, str);
 336         for_each_engine(engine, i915, id)
 337                 ok &= intel_engine_verify_workarounds(engine, str);
 338
 339         return ok;
 340 }
 341
 342 static int
 343 live_gpu_reset_gt_engine_workarounds(void *arg)
 344 {
 345         struct drm_i915_private *i915 = arg;
 346         struct i915_gpu_error *error = &i915->gpu_error;
 347         bool ok;
 348
 349         if (!intel_has_gpu_reset(i915))
 350                 return 0;
 351
 352         pr_info("Verifying after GPU reset...\n");
 353
 354         igt_global_reset_lock(i915);
 355         intel_runtime_pm_get(i915);
 356
 357         ok = verify_gt_engine_wa(i915, "before reset");
 358         if (!ok)
 359                 goto out;
 360
 361         set_bit(I915_RESET_HANDOFF, &error->flags);
 362         i915_reset(i915, ALL_ENGINES, "live_workarounds");
 363
 364         ok = verify_gt_engine_wa(i915, "after reset");
 365
 366 out:
 367         intel_runtime_pm_put(i915);
 368         igt_global_reset_unlock(i915);
 369
 370         return ok ? 0 : -ESRCH;
 371 }
 372
 373 static int
 374 live_engine_reset_gt_engine_workarounds(void *arg)
 375 {
 376         struct drm_i915_private *i915 = arg;
 377         struct intel_engine_cs *engine;
 378         struct i915_gem_context *ctx;
 379         struct igt_spinner spin;
 380         enum intel_engine_id id;
 381         struct i915_request *rq;
 382         int ret = 0;
 383
 384         if (!intel_has_reset_engine(i915))
 385                 return 0;
 386
 387         ctx = kernel_context(i915);
 388         if (IS_ERR(ctx))
 389                 return PTR_ERR(ctx);
 390
 391         igt_global_reset_lock(i915);
 392         intel_runtime_pm_get(i915);
 393
 394         for_each_engine(engine, i915, id) {
 395                 bool ok;
 396
 397                 pr_info("Verifying after %s reset...\n", engine->name);
 398
 399                 ok = verify_gt_engine_wa(i915, "before reset");
 400                 if (!ok) {
 401                         ret = -ESRCH;
 402                         goto err;
 403                 }
 404
 405                 i915_reset_engine(engine, "live_workarounds");
 406
 407                 ok = verify_gt_engine_wa(i915, "after idle reset");
 408                 if (!ok) {
 409                         ret = -ESRCH;
 410                         goto err;
 411                 }
 412
 413                 ret = igt_spinner_init(&spin, i915);
 414                 if (ret)
 415                         goto err;
 416
 417                 rq = igt_spinner_create_request(&spin, ctx, engine, MI_NOOP);
 418                 if (IS_ERR(rq)) {
 419                         ret = PTR_ERR(rq);
 420                         igt_spinner_fini(&spin);
 421                         goto err;
 422                 }
 423
 424                 i915_request_add(rq);
 425
 426                 if (!igt_wait_for_spinner(&spin, rq)) {
 427                         pr_err("Spinner failed to start\n");
 428                         igt_spinner_fini(&spin);
 429                         ret = -ETIMEDOUT;
 430                         goto err;
 431                 }
 432
 433                 i915_reset_engine(engine, "live_workarounds");
 434
 435                 igt_spinner_end(&spin);
 436                 igt_spinner_fini(&spin);
 437
 438                 ok = verify_gt_engine_wa(i915, "after busy reset");
 439                 if (!ok) {
 440                         ret = -ESRCH;
 441                         goto err;
 442                 }
 443         }
 444
 445 err:
 446         intel_runtime_pm_put(i915);
 447         igt_global_reset_unlock(i915);
 448         kernel_context_close(ctx);
 449
 450         igt_flush_test(i915, I915_WAIT_LOCKED);
 451
 452         return ret;
 453 }
 454
 455 int intel_workarounds_live_selftests(struct drm_i915_private *i915)
 456 {
 457         static const struct i915_subtest tests[] = {
 458                 SUBTEST(live_reset_whitelist),
 459                 SUBTEST(live_gpu_reset_gt_engine_workarounds),
 460                 SUBTEST(live_engine_reset_gt_engine_workarounds),
 461         };
 462         int err;
 463
 464         if (i915_terminally_wedged(&i915->gpu_error))
 465                 return 0;
 466
 467         mutex_lock(&i915->drm.struct_mutex);
 468         err = i915_subtests(tests, i915);
 469         mutex_unlock(&i915->drm.struct_mutex);
 470
 471         return err;
 472 }