If we already wedged, i915_gem_set_wedged() becomes a complicated no-op. v2: Make sure the double set-wedged is synchronous, a parallel call should not return before the driver is indeed wedged. v3: Use a real mutex (and fingers crossed that lockdep is ok!) References: https://bugs.freedesktop.org/show_bug.cgi?id=107343 Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/i915_gem.c | 36 +++++++++++++------ drivers/gpu/drm/i915/i915_gpu_error.h | 4 ++- .../gpu/drm/i915/selftests/mock_gem_device.c | 1 + 3 files changed, 29 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 0453eb42a1a3..d9e00705536d 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3300,10 +3300,15 @@ static void nop_complete_submit_request(struct i915_request *request) void i915_gem_set_wedged(struct drm_i915_private *i915) { + struct i915_gpu_error *error = &i915->gpu_error; struct intel_engine_cs *engine; enum intel_engine_id id; - GEM_TRACE("start\n"); + mutex_lock(&error->wedge_mutex); + if (test_bit(I915_WEDGED, &error->flags)) { + mutex_unlock(&error->wedge_mutex); + return; + } if (GEM_SHOW_DEBUG()) { struct drm_printer p = drm_debug_printer(__func__); @@ -3312,8 +3317,7 @@ void i915_gem_set_wedged(struct drm_i915_private *i915) intel_engine_dump(engine, &p, "%s\n", engine->name); } - if (test_and_set_bit(I915_WEDGED, &i915->gpu_error.flags)) - goto out; + GEM_TRACE("start\n"); /* * First, stop submission to hw, but do not yet complete requests by @@ -3373,19 +3377,27 @@ void i915_gem_set_wedged(struct drm_i915_private *i915) i915_gem_reset_finish_engine(engine); } -out: + smp_mb__before_atomic(); + set_bit(I915_WEDGED, &error->flags); + GEM_TRACE("end\n"); + mutex_unlock(&error->wedge_mutex); - wake_up_all(&i915->gpu_error.reset_queue); + wake_up_all(&error->reset_queue); } bool i915_gem_unset_wedged(struct drm_i915_private *i915) { + struct i915_gpu_error *error = &i915->gpu_error; struct i915_timeline *tl; + bool ret = false; lockdep_assert_held(&i915->drm.struct_mutex); - if (!test_bit(I915_WEDGED, &i915->gpu_error.flags)) - return true; + + if (!test_bit(I915_WEDGED, &error->flags)) + return false; + + mutex_lock(&error->wedge_mutex); GEM_TRACE("start\n"); @@ -3420,7 +3432,7 @@ bool i915_gem_unset_wedged(struct drm_i915_private *i915) */ if (dma_fence_default_wait(&rq->fence, true, MAX_SCHEDULE_TIMEOUT) < 0) - return false; + goto unlock; } i915_retire_requests(i915); GEM_BUG_ON(i915->gt.active_requests); @@ -3439,10 +3451,11 @@ bool i915_gem_unset_wedged(struct drm_i915_private *i915) GEM_TRACE("end\n"); - smp_mb__before_atomic(); /* complete takeover before enabling execbuf */ - clear_bit(I915_WEDGED, &i915->gpu_error.flags); + ret = true; +unlock: + mutex_unlock(&i915->gpu_error.wedge_mutex); - return true; + return ret; } static void @@ -5764,6 +5777,7 @@ int i915_gem_init_early(struct drm_i915_private *dev_priv) i915_gem_idle_work_handler); init_waitqueue_head(&dev_priv->gpu_error.wait_queue); init_waitqueue_head(&dev_priv->gpu_error.reset_queue); + mutex_init(&dev_priv->gpu_error.wedge_mutex); atomic_set(&dev_priv->mm.bsd_engine_dispatch_index, 0); diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h index f893a4e8b783..49950b1231cf 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.h +++ b/drivers/gpu/drm/i915/i915_gpu_error.h @@ -267,8 +267,8 @@ struct i915_gpu_error { #define I915_RESET_BACKOFF 0 #define I915_RESET_HANDOFF 1 #define I915_RESET_MODESET 2 +#define I915_RESET_ENGINE 3 #define I915_WEDGED (BITS_PER_LONG - 1) -#define I915_RESET_ENGINE (I915_WEDGED - I915_NUM_ENGINES) /** Number of times an engine has been reset */ u32 reset_engine_count[I915_NUM_ENGINES]; @@ -279,6 +279,8 @@ struct i915_gpu_error { /** Reason for the current *global* reset */ const char *reason; + struct mutex wedge_mutex; /* serialises wedging/unwedging */ + /** * Waitqueue to signal when a hang is detected. Used to for waiters * to release the struct_mutex for the reset to procede. diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c index 43ed8b28aeaa..6beb1f47e988 100644 --- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c +++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c @@ -186,6 +186,7 @@ struct drm_i915_private *mock_gem_device(void) init_waitqueue_head(&i915->gpu_error.wait_queue); init_waitqueue_head(&i915->gpu_error.reset_queue); + mutex_init(&i915->gpu_error.wedge_mutex); i915->wq = alloc_ordered_workqueue("mock", 0); if (!i915->wq) -- 2.18.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
