diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 39 |
1 files changed, 28 insertions, 11 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index a5bd07338b46..7b5a9d7c9593 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -433,20 +433,28 @@ i915_gem_object_wait_reservation(struct reservation_object *resv, dma_fence_put(shared[i]); kfree(shared); + /* + * If both shared fences and an exclusive fence exist, + * then by construction the shared fences must be later + * than the exclusive fence. If we successfully wait for + * all the shared fences, we know that the exclusive fence + * must all be signaled. If all the shared fences are + * signaled, we can prune the array and recover the + * floating references on the fences/requests. + */ prune_fences = count && timeout >= 0; } else { excl = reservation_object_get_excl_rcu(resv); } - if (excl && timeout >= 0) { + if (excl && timeout >= 0) timeout = i915_gem_object_wait_fence(excl, flags, timeout, rps_client); - prune_fences = timeout >= 0; - } dma_fence_put(excl); - /* Oportunistically prune the fences iff we know they have *all* been + /* + * Opportunistically prune the fences iff we know they have *all* been * signaled and that the reservation object has not been changed (i.e. * no new fences have been added). */ @@ -471,10 +479,11 @@ static void __fence_set_priority(struct dma_fence *fence, int prio) rq = to_request(fence); engine = rq->engine; - if (!engine->schedule) - return; - engine->schedule(rq, prio); + rcu_read_lock(); + if (engine->schedule) + engine->schedule(rq, prio); + rcu_read_unlock(); } static void fence_set_priority(struct dma_fence *fence, int prio) @@ -2939,8 +2948,16 @@ i915_gem_reset_prepare_engine(struct intel_engine_cs *engine) * calling engine->init_hw() and also writing the ELSP. * Turning off the execlists->tasklet until the reset is over * prevents the race. + * + * Note that this needs to be a single atomic operation on the + * tasklet (flush existing tasks, prevent new tasks) to prevent + * a race between reset and set-wedged. It is not, so we do the best + * we can atm and make sure we don't lock the machine up in the more + * common case of recursively being called from set-wedged from inside + * i915_reset. */ - tasklet_kill(&engine->execlists.tasklet); + if (!atomic_read(&engine->execlists.tasklet.count)) + tasklet_kill(&engine->execlists.tasklet); tasklet_disable(&engine->execlists.tasklet); /* @@ -3214,8 +3231,11 @@ void i915_gem_set_wedged(struct drm_i915_private *i915) */ for_each_engine(engine, i915, id) { i915_gem_reset_prepare_engine(engine); + engine->submit_request = nop_submit_request; + engine->schedule = NULL; } + i915->caps.scheduler = 0; /* * Make sure no one is running the old callback before we proceed with @@ -3233,11 +3253,8 @@ void i915_gem_set_wedged(struct drm_i915_private *i915) * start to complete all requests. */ engine->submit_request = nop_complete_submit_request; - engine->schedule = NULL; } - i915->caps.scheduler = 0; - /* * Make sure no request can slip through without getting completed by * either this call here to intel_engine_init_global_seqno, or the one |