drivers/gpu/drm/i915/gt/selftest_context.c

   1 /*
   2  * SPDX-License-Identifier: GPL-2.0
   3  *
   4  * Copyright © 2019 Intel Corporation
   5  */
   6
   7 #include "i915_selftest.h"
   8 #include "intel_engine_heartbeat.h"
   9 #include "intel_engine_pm.h"
  10 #include "intel_gt.h"
  11
  12 #include "gem/selftests/mock_context.h"
  13 #include "selftests/igt_flush_test.h"
  14 #include "selftests/mock_drm.h"
  15
  16 static int request_sync(struct i915_request *rq)
  17 {
  18         struct intel_timeline *tl = i915_request_timeline(rq);
  19         long timeout;
  20         int err = 0;
  21
  22         intel_timeline_get(tl);
  23         i915_request_get(rq);
  24
  25         /* Opencode i915_request_add() so we can keep the timeline locked. */
  26         __i915_request_commit(rq);
  27         __i915_request_queue(rq, NULL);
  28
  29         timeout = i915_request_wait(rq, 0, HZ / 10);
  30         if (timeout < 0)
  31                 err = timeout;
  32         else
  33                 i915_request_retire_upto(rq);
  34
  35         lockdep_unpin_lock(&tl->mutex, rq->cookie);
  36         mutex_unlock(&tl->mutex);
  37
  38         i915_request_put(rq);
  39         intel_timeline_put(tl);
  40
  41         return err;
  42 }
  43
  44 static int context_sync(struct intel_context *ce)
  45 {
  46         struct intel_timeline *tl = ce->timeline;
  47         int err = 0;
  48
  49         mutex_lock(&tl->mutex);
  50         do {
  51                 struct i915_request *rq;
  52                 long timeout;
  53
  54                 if (list_empty(&tl->requests))
  55                         break;
  56
  57                 rq = list_last_entry(&tl->requests, typeof(*rq), link);
  58                 i915_request_get(rq);
  59
  60                 timeout = i915_request_wait(rq, 0, HZ / 10);
  61                 if (timeout < 0)
  62                         err = timeout;
  63                 else
  64                         i915_request_retire_upto(rq);
  65
  66                 i915_request_put(rq);
  67         } while (!err);
  68         mutex_unlock(&tl->mutex);
  69
  70         return err;
  71 }
  72
  73 static int __live_context_size(struct intel_engine_cs *engine)
  74 {
  75         struct intel_context *ce;
  76         struct i915_request *rq;
  77         void *vaddr;
  78         int err;
  79
  80         ce = intel_context_create(engine);
  81         if (IS_ERR(ce))
  82                 return PTR_ERR(ce);
  83
  84         err = intel_context_pin(ce);
  85         if (err)
  86                 goto err;
  87
  88         vaddr = i915_gem_object_pin_map(ce->state->obj,
  89                                         i915_coherent_map_type(engine->i915));
  90         if (IS_ERR(vaddr)) {
  91                 err = PTR_ERR(vaddr);
  92                 intel_context_unpin(ce);
  93                 goto err;
  94         }
  95
  96         /*
  97          * Note that execlists also applies a redzone which it checks on
  98          * context unpin when debugging. We are using the same location
  99          * and same poison value so that our checks overlap. Despite the
 100          * redundancy, we want to keep this little selftest so that we
 101          * get coverage of any and all submission backends, and we can
 102          * always extend this test to ensure we trick the HW into a
 103          * compromising position wrt to the various sections that need
 104          * to be written into the context state.
 105          *
 106          * TLDR; this overlaps with the execlists redzone.
 107          */
 108         vaddr += engine->context_size - I915_GTT_PAGE_SIZE;
 109         memset(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE);
 110
 111         rq = intel_context_create_request(ce);
 112         intel_context_unpin(ce);
 113         if (IS_ERR(rq)) {
 114                 err = PTR_ERR(rq);
 115                 goto err_unpin;
 116         }
 117
 118         err = request_sync(rq);
 119         if (err)
 120                 goto err_unpin;
 121
 122         /* Force the context switch */
 123         rq = intel_engine_create_kernel_request(engine);
 124         if (IS_ERR(rq)) {
 125                 err = PTR_ERR(rq);
 126                 goto err_unpin;
 127         }
 128         err = request_sync(rq);
 129         if (err)
 130                 goto err_unpin;
 131
 132         if (memchr_inv(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE)) {
 133                 pr_err("%s context overwrote trailing red-zone!", engine->name);
 134                 err = -EINVAL;
 135         }
 136
 137 err_unpin:
 138         i915_gem_object_unpin_map(ce->state->obj);
 139 err:
 140         intel_context_put(ce);
 141         return err;
 142 }
 143
 144 static int live_context_size(void *arg)
 145 {
 146         struct intel_gt *gt = arg;
 147         struct intel_engine_cs *engine;
 148         enum intel_engine_id id;
 149         int err = 0;
 150
 151         /*
 152          * Check that our context sizes are correct by seeing if the
 153          * HW tries to write past the end of one.
 154          */
 155
 156         for_each_engine(engine, gt, id) {
 157                 struct {
 158                         struct drm_i915_gem_object *state;
 159                         void *pinned;
 160                 } saved;
 161
 162                 if (!engine->context_size)
 163                         continue;
 164
 165                 intel_engine_pm_get(engine);
 166
 167                 /*
 168                  * Hide the old default state -- we lie about the context size
 169                  * and get confused when the default state is smaller than
 170                  * expected. For our do nothing request, inheriting the
 171                  * active state is sufficient, we are only checking that we
 172                  * don't use more than we planned.
 173                  */
 174                 saved.state = fetch_and_zero(&engine->default_state);
 175                 saved.pinned = fetch_and_zero(&engine->pinned_default_state);
 176
 177                 /* Overlaps with the execlists redzone */
 178                 engine->context_size += I915_GTT_PAGE_SIZE;
 179
 180                 err = __live_context_size(engine);
 181
 182                 engine->context_size -= I915_GTT_PAGE_SIZE;
 183
 184                 engine->pinned_default_state = saved.pinned;
 185                 engine->default_state = saved.state;
 186
 187                 intel_engine_pm_put(engine);
 188
 189                 if (err)
 190                         break;
 191         }
 192
 193         return err;
 194 }
 195
 196 static int __live_active_context(struct intel_engine_cs *engine)
 197 {
 198         unsigned long saved_heartbeat;
 199         struct intel_context *ce;
 200         int pass;
 201         int err;
 202
 203         /*
 204          * We keep active contexts alive until after a subsequent context
 205          * switch as the final write from the context-save will be after
 206          * we retire the final request. We track when we unpin the context,
 207          * under the presumption that the final pin is from the last request,
 208          * and instead of immediately unpinning the context, we add a task
 209          * to unpin the context from the next idle-barrier.
 210          *
 211          * This test makes sure that the context is kept alive until a
 212          * subsequent idle-barrier (emitted when the engine wakeref hits 0
 213          * with no more outstanding requests).
 214          */
 215
 216         if (intel_engine_pm_is_awake(engine)) {
 217                 pr_err("%s is awake before starting %s!\n",
 218                        engine->name, __func__);
 219                 return -EINVAL;
 220         }
 221
 222         ce = intel_context_create(engine);
 223         if (IS_ERR(ce))
 224                 return PTR_ERR(ce);
 225
 226         saved_heartbeat = engine->props.heartbeat_interval_ms;
 227         engine->props.heartbeat_interval_ms = 0;
 228
 229         for (pass = 0; pass <= 2; pass++) {
 230                 struct i915_request *rq;
 231
 232                 intel_engine_pm_get(engine);
 233
 234                 rq = intel_context_create_request(ce);
 235                 if (IS_ERR(rq)) {
 236                         err = PTR_ERR(rq);
 237                         goto out_engine;
 238                 }
 239
 240                 err = request_sync(rq);
 241                 if (err)
 242                         goto out_engine;
 243
 244                 /* Context will be kept active until after an idle-barrier. */
 245                 if (i915_active_is_idle(&ce->active)) {
 246                         pr_err("context is not active; expected idle-barrier (%s pass %d)\n",
 247                                engine->name, pass);
 248                         err = -EINVAL;
 249                         goto out_engine;
 250                 }
 251
 252                 if (!intel_engine_pm_is_awake(engine)) {
 253                         pr_err("%s is asleep before idle-barrier\n",
 254                                engine->name);
 255                         err = -EINVAL;
 256                         goto out_engine;
 257                 }
 258
 259 out_engine:
 260                 intel_engine_pm_put(engine);
 261                 if (err)
 262                         goto err;
 263         }
 264
 265         /* Now make sure our idle-barriers are flushed */
 266         err = intel_engine_flush_barriers(engine);
 267         if (err)
 268                 goto err;
 269
 270         /* Wait for the barrier and in the process wait for engine to park */
 271         err = context_sync(engine->kernel_context);
 272         if (err)
 273                 goto err;
 274
 275         if (!i915_active_is_idle(&ce->active)) {
 276                 pr_err("context is still active!");
 277                 err = -EINVAL;
 278         }
 279
 280         intel_engine_pm_flush(engine);
 281
 282         if (intel_engine_pm_is_awake(engine)) {
 283                 struct drm_printer p = drm_debug_printer(__func__);
 284
 285                 intel_engine_dump(engine, &p,
 286                                   "%s is still awake:%d after idle-barriers\n",
 287                                   engine->name,
 288                                   atomic_read(&engine->wakeref.count));
 289                 GEM_TRACE_DUMP();
 290
 291                 err = -EINVAL;
 292                 goto err;
 293         }
 294
 295 err:
 296         engine->props.heartbeat_interval_ms = saved_heartbeat;
 297         intel_context_put(ce);
 298         return err;
 299 }
 300
 301 static int live_active_context(void *arg)
 302 {
 303         struct intel_gt *gt = arg;
 304         struct intel_engine_cs *engine;
 305         enum intel_engine_id id;
 306         int err = 0;
 307
 308         for_each_engine(engine, gt, id) {
 309                 err = __live_active_context(engine);
 310                 if (err)
 311                         break;
 312
 313                 err = igt_flush_test(gt->i915);
 314                 if (err)
 315                         break;
 316         }
 317
 318         return err;
 319 }
 320
 321 static int __remote_sync(struct intel_context *ce, struct intel_context *remote)
 322 {
 323         struct i915_request *rq;
 324         int err;
 325
 326         err = intel_context_pin(remote);
 327         if (err)
 328                 return err;
 329
 330         rq = intel_context_create_request(ce);
 331         if (IS_ERR(rq)) {
 332                 err = PTR_ERR(rq);
 333                 goto unpin;
 334         }
 335
 336         err = intel_context_prepare_remote_request(remote, rq);
 337         if (err) {
 338                 i915_request_add(rq);
 339                 goto unpin;
 340         }
 341
 342         err = request_sync(rq);
 343
 344 unpin:
 345         intel_context_unpin(remote);
 346         return err;
 347 }
 348
 349 static int __live_remote_context(struct intel_engine_cs *engine)
 350 {
 351         struct intel_context *local, *remote;
 352         unsigned long saved_heartbeat;
 353         int pass;
 354         int err;
 355
 356         /*
 357          * Check that our idle barriers do not interfere with normal
 358          * activity tracking. In particular, check that operating
 359          * on the context image remotely (intel_context_prepare_remote_request),
 360          * which inserts foreign fences into intel_context.active, does not
 361          * clobber the idle-barrier.
 362          */
 363
 364         if (intel_engine_pm_is_awake(engine)) {
 365                 pr_err("%s is awake before starting %s!\n",
 366                        engine->name, __func__);
 367                 return -EINVAL;
 368         }
 369
 370         remote = intel_context_create(engine);
 371         if (IS_ERR(remote))
 372                 return PTR_ERR(remote);
 373
 374         local = intel_context_create(engine);
 375         if (IS_ERR(local)) {
 376                 err = PTR_ERR(local);
 377                 goto err_remote;
 378         }
 379
 380         saved_heartbeat = engine->props.heartbeat_interval_ms;
 381         engine->props.heartbeat_interval_ms = 0;
 382         intel_engine_pm_get(engine);
 383
 384         for (pass = 0; pass <= 2; pass++) {
 385                 err = __remote_sync(local, remote);
 386                 if (err)
 387                         break;
 388
 389                 err = __remote_sync(engine->kernel_context, remote);
 390                 if (err)
 391                         break;
 392
 393                 if (i915_active_is_idle(&remote->active)) {
 394                         pr_err("remote context is not active; expected idle-barrier (%s pass %d)\n",
 395                                engine->name, pass);
 396                         err = -EINVAL;
 397                         break;
 398                 }
 399         }
 400
 401         intel_engine_pm_put(engine);
 402         engine->props.heartbeat_interval_ms = saved_heartbeat;
 403
 404         intel_context_put(local);
 405 err_remote:
 406         intel_context_put(remote);
 407         return err;
 408 }
 409
 410 static int live_remote_context(void *arg)
 411 {
 412         struct intel_gt *gt = arg;
 413         struct intel_engine_cs *engine;
 414         enum intel_engine_id id;
 415         int err = 0;
 416
 417         for_each_engine(engine, gt, id) {
 418                 err = __live_remote_context(engine);
 419                 if (err)
 420                         break;
 421
 422                 err = igt_flush_test(gt->i915);
 423                 if (err)
 424                         break;
 425         }
 426
 427         return err;
 428 }
 429
 430 int intel_context_live_selftests(struct drm_i915_private *i915)
 431 {
 432         static const struct i915_subtest tests[] = {
 433                 SUBTEST(live_context_size),
 434                 SUBTEST(live_active_context),
 435                 SUBTEST(live_remote_context),
 436         };
 437         struct intel_gt *gt = &i915->gt;
 438
 439         if (intel_gt_is_wedged(gt))
 440                 return 0;
 441
 442         return intel_gt_live_subtests(tests, gt);
 443 }