diff options
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 7 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.h | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_context.c | 86 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_request.c | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/i915_gem_context.c | 144 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/i915_mock_selftests.h | 1 |
6 files changed, 231 insertions, 15 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 03874b50ada9..05f44ca35a06 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3703,6 +3703,9 @@ static int wait_for_engines(struct drm_i915_private *i915) int i915_gem_wait_for_idle(struct drm_i915_private *i915, unsigned int flags) { + GEM_TRACE("flags=%x (%s)\n", + flags, flags & I915_WAIT_LOCKED ? "locked" : "unlocked"); + /* If the device is asleep, we have no requests outstanding */ if (!READ_ONCE(i915->gt.awake)) return 0; @@ -3719,6 +3722,7 @@ int i915_gem_wait_for_idle(struct drm_i915_private *i915, unsigned int flags) return err; } i915_retire_requests(i915); + GEM_BUG_ON(i915->gt.active_requests); return wait_for_engines(i915); } else { @@ -4901,6 +4905,7 @@ static void assert_kernel_context_is_current(struct drm_i915_private *i915) struct intel_engine_cs *engine; enum intel_engine_id id; + GEM_BUG_ON(i915->gt.active_requests); for_each_engine(engine, i915, id) { GEM_BUG_ON(__i915_gem_active_peek(&engine->timeline.last_request)); GEM_BUG_ON(engine->last_retired_context->gem_context != kctx); @@ -4932,6 +4937,8 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv) struct drm_device *dev = &dev_priv->drm; int ret; + GEM_TRACE("\n"); + intel_runtime_pm_get(dev_priv); intel_suspend_gt_powersave(dev_priv); diff --git a/drivers/gpu/drm/i915/i915_gem.h b/drivers/gpu/drm/i915/i915_gem.h index 5bf24cfc218c..62ee4e385365 100644 --- a/drivers/gpu/drm/i915/i915_gem.h +++ b/drivers/gpu/drm/i915/i915_gem.h @@ -63,9 +63,12 @@ struct drm_i915_private; #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM) #define GEM_TRACE(...) trace_printk(__VA_ARGS__) #define GEM_TRACE_DUMP() ftrace_dump(DUMP_ALL) +#define GEM_TRACE_DUMP_ON(expr) \ + do { if (expr) ftrace_dump(DUMP_ALL); } while (0) #else #define GEM_TRACE(...) do { } while (0) #define GEM_TRACE_DUMP() do { } while (0) +#define GEM_TRACE_DUMP_ON(expr) BUILD_BUG_ON_INVALID(expr) #endif #define I915_NUM_ENGINES 8 diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index b69b18ef8120..45393f6e0208 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -576,30 +576,72 @@ last_request_on_engine(struct i915_timeline *timeline, { struct i915_request *rq; - if (timeline == &engine->timeline) - return NULL; + GEM_BUG_ON(timeline == &engine->timeline); rq = i915_gem_active_raw(&timeline->last_request, &engine->i915->drm.struct_mutex); - if (rq && rq->engine == engine) + if (rq && rq->engine == engine) { + GEM_TRACE("last request for %s on engine %s: %llx:%d\n", + timeline->name, engine->name, + rq->fence.context, rq->fence.seqno); + GEM_BUG_ON(rq->timeline != timeline); return rq; + } return NULL; } -static bool engine_has_idle_kernel_context(struct intel_engine_cs *engine) +static bool engine_has_kernel_context_barrier(struct intel_engine_cs *engine) { - struct list_head * const active_rings = &engine->i915->gt.active_rings; + struct drm_i915_private *i915 = engine->i915; + const struct intel_context * const ce = + to_intel_context(i915->kernel_context, engine); + struct i915_timeline *barrier = ce->ring->timeline; struct intel_ring *ring; + bool any_active = false; - lockdep_assert_held(&engine->i915->drm.struct_mutex); + lockdep_assert_held(&i915->drm.struct_mutex); + list_for_each_entry(ring, &i915->gt.active_rings, active_link) { + struct i915_request *rq; + + rq = last_request_on_engine(ring->timeline, engine); + if (!rq) + continue; - list_for_each_entry(ring, active_rings, active_link) { - if (last_request_on_engine(ring->timeline, engine)) + any_active = true; + + if (rq->gem_context == i915->kernel_context) + continue; + + /* + * Was this request submitted after the previous + * switch-to-kernel-context? + */ + if (!i915_timeline_sync_is_later(barrier, &rq->fence)) { + GEM_TRACE("%s needs barrier for %llx:%d\n", + ring->timeline->name, + rq->fence.context, + rq->fence.seqno); return false; + } + + GEM_TRACE("%s has barrier after %llx:%d\n", + ring->timeline->name, + rq->fence.context, + rq->fence.seqno); } - return intel_engine_has_kernel_context(engine); + /* + * If any other timeline was still active and behind the last barrier, + * then our last switch-to-kernel-context must still be queued and + * will run last (leaving the engine in the kernel context when it + * eventually idles). + */ + if (any_active) + return true; + + /* The engine is idle; check that it is idling in the kernel context. */ + return engine->last_retired_context == ce; } int i915_gem_switch_to_kernel_context(struct drm_i915_private *i915) @@ -607,7 +649,10 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *i915) struct intel_engine_cs *engine; enum intel_engine_id id; + GEM_TRACE("\n"); + lockdep_assert_held(&i915->drm.struct_mutex); + GEM_BUG_ON(!i915->kernel_context); i915_retire_requests(i915); @@ -615,9 +660,12 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *i915) struct intel_ring *ring; struct i915_request *rq; - if (engine_has_idle_kernel_context(engine)) + GEM_BUG_ON(!to_intel_context(i915->kernel_context, engine)); + if (engine_has_kernel_context_barrier(engine)) continue; + GEM_TRACE("emit barrier on %s\n", engine->name); + rq = i915_request_alloc(engine, i915->kernel_context); if (IS_ERR(rq)) return PTR_ERR(rq); @@ -627,10 +675,20 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *i915) struct i915_request *prev; prev = last_request_on_engine(ring->timeline, engine); - if (prev) - i915_sw_fence_await_sw_fence_gfp(&rq->submit, - &prev->submit, - I915_FENCE_GFP); + if (!prev) + continue; + + if (prev->gem_context == i915->kernel_context) + continue; + + GEM_TRACE("add barrier on %s for %llx:%d\n", + engine->name, + prev->fence.context, + prev->fence.seqno); + i915_sw_fence_await_sw_fence_gfp(&rq->submit, + &prev->submit, + I915_FENCE_GFP); + i915_timeline_sync_set(rq->timeline, &prev->fence); } /* diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index fc499bcbd105..f187250e60c6 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -320,6 +320,7 @@ static void advance_ring(struct i915_request *request) * is just about to be. Either works, if we miss the last two * noops - they are safe to be replayed on a reset. */ + GEM_TRACE("marking %s as inactive\n", ring->timeline->name); tail = READ_ONCE(request->tail); list_del(&ring->active_link); } else { @@ -1095,8 +1096,10 @@ void __i915_request_add(struct i915_request *request, bool flush_caches) i915_gem_active_set(&timeline->last_request, request); list_add_tail(&request->ring_link, &ring->request_list); - if (list_is_first(&request->ring_link, &ring->request_list)) + if (list_is_first(&request->ring_link, &ring->request_list)) { + GEM_TRACE("marking %s as active\n", ring->timeline->name); list_add(&ring->active_link, &request->i915->gt.active_rings); + } request->emitted_jiffies = jiffies; /* diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/selftests/i915_gem_context.c index ddb03f009232..b39392a00a6f 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_context.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_context.c @@ -26,6 +26,7 @@ #include "igt_flush_test.h" #include "mock_drm.h" +#include "mock_gem_device.h" #include "huge_gem_object.h" #define DW_PER_PAGE (PAGE_SIZE / sizeof(u32)) @@ -420,6 +421,130 @@ out_unlock: return err; } +static __maybe_unused const char * +__engine_name(struct drm_i915_private *i915, unsigned int engines) +{ + struct intel_engine_cs *engine; + unsigned int tmp; + + if (engines == ALL_ENGINES) + return "all"; + + for_each_engine_masked(engine, i915, engines, tmp) + return engine->name; + + return "none"; +} + +static int __igt_switch_to_kernel_context(struct drm_i915_private *i915, + struct i915_gem_context *ctx, + unsigned int engines) +{ + struct intel_engine_cs *engine; + unsigned int tmp; + int err; + + GEM_TRACE("Testing %s\n", __engine_name(i915, engines)); + for_each_engine_masked(engine, i915, engines, tmp) { + struct i915_request *rq; + + rq = i915_request_alloc(engine, ctx); + if (IS_ERR(rq)) + return PTR_ERR(rq); + + i915_request_add(rq); + } + + err = i915_gem_switch_to_kernel_context(i915); + if (err) + return err; + + for_each_engine_masked(engine, i915, engines, tmp) { + if (!engine_has_kernel_context_barrier(engine)) { + pr_err("kernel context not last on engine %s!\n", + engine->name); + return -EINVAL; + } + } + + err = i915_gem_wait_for_idle(i915, I915_WAIT_LOCKED); + if (err) + return err; + + GEM_BUG_ON(i915->gt.active_requests); + for_each_engine_masked(engine, i915, engines, tmp) { + if (engine->last_retired_context->gem_context != i915->kernel_context) { + pr_err("engine %s not idling in kernel context!\n", + engine->name); + return -EINVAL; + } + } + + err = i915_gem_switch_to_kernel_context(i915); + if (err) + return err; + + if (i915->gt.active_requests) { + pr_err("switch-to-kernel-context emitted %d requests even though it should already be idling in the kernel context\n", + i915->gt.active_requests); + return -EINVAL; + } + + for_each_engine_masked(engine, i915, engines, tmp) { + if (!intel_engine_has_kernel_context(engine)) { + pr_err("kernel context not last on engine %s!\n", + engine->name); + return -EINVAL; + } + } + + return 0; +} + +static int igt_switch_to_kernel_context(void *arg) +{ + struct drm_i915_private *i915 = arg; + struct intel_engine_cs *engine; + struct i915_gem_context *ctx; + enum intel_engine_id id; + int err; + + /* + * A core premise of switching to the kernel context is that + * if an engine is already idling in the kernel context, we + * do not emit another request and wake it up. The other being + * that we do indeed end up idling in the kernel context. + */ + + mutex_lock(&i915->drm.struct_mutex); + ctx = kernel_context(i915); + if (IS_ERR(ctx)) { + err = PTR_ERR(ctx); + goto out_unlock; + } + + /* First check idling each individual engine */ + for_each_engine(engine, i915, id) { + err = __igt_switch_to_kernel_context(i915, ctx, BIT(id)); + if (err) + goto out_unlock; + } + + /* Now en masse */ + err = __igt_switch_to_kernel_context(i915, ctx, ALL_ENGINES); + if (err) + goto out_unlock; + +out_unlock: + GEM_TRACE_DUMP_ON(err); + if (igt_flush_test(i915, I915_WAIT_LOCKED)) + err = -EIO; + mutex_unlock(&i915->drm.struct_mutex); + + kernel_context_close(ctx); + return err; +} + static int fake_aliasing_ppgtt_enable(struct drm_i915_private *i915) { struct drm_i915_gem_object *obj; @@ -447,9 +572,28 @@ static void fake_aliasing_ppgtt_disable(struct drm_i915_private *i915) i915_gem_fini_aliasing_ppgtt(i915); } +int i915_gem_context_mock_selftests(void) +{ + static const struct i915_subtest tests[] = { + SUBTEST(igt_switch_to_kernel_context), + }; + struct drm_i915_private *i915; + int err; + + i915 = mock_gem_device(); + if (!i915) + return -ENOMEM; + + err = i915_subtests(tests, i915); + + drm_dev_unref(&i915->drm); + return err; +} + int i915_gem_context_live_selftests(struct drm_i915_private *dev_priv) { static const struct i915_subtest tests[] = { + SUBTEST(igt_switch_to_kernel_context), SUBTEST(igt_ctx_exec), }; bool fake_alias = false; diff --git a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h index d16d74178e9d..1b70208eeea7 100644 --- a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h +++ b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h @@ -24,3 +24,4 @@ selftest(vma, i915_vma_mock_selftests) selftest(evict, i915_gem_evict_mock_selftests) selftest(gtt, i915_gem_gtt_mock_selftests) selftest(hugepages, i915_gem_huge_page_mock_selftests) +selftest(contexts, i915_gem_context_mock_selftests) |