diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_request.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_request.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index 96a9e8bcd805..a7d87cfaabcb 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -552,6 +552,36 @@ submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) return NOTIFY_DONE; } +static int __i915_sw_fence_call +semaphore_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) +{ + struct i915_request *request = + container_of(fence, typeof(*request), semaphore); + + switch (state) { + case FENCE_COMPLETE: + /* + * We only check a small portion of our dependencies + * and so cannot guarantee that there remains no + * semaphore chain across all. Instead of opting + * for the full NOSEMAPHORE boost, we go for the + * smaller (but still preempting) boost of + * NEWCLIENT. This will be enough to boost over + * a busywaiting request (as that cannot be + * NEWCLIENT) without accidentally boosting + * a busywait over real work elsewhere. + */ + i915_schedule_bump_priority(request, I915_PRIORITY_NEWCLIENT); + break; + + case FENCE_FREE: + i915_request_put(request); + break; + } + + return NOTIFY_DONE; +} + static void ring_retire_requests(struct intel_ring *ring) { struct i915_request *rq, *rn; @@ -702,6 +732,7 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx) /* We bump the ref for the fence chain */ i915_sw_fence_init(&i915_request_get(rq)->submit, submit_notify); + i915_sw_fence_init(&i915_request_get(rq)->semaphore, semaphore_notify); i915_sched_node_init(&rq->sched); @@ -784,6 +815,12 @@ emit_semaphore_wait(struct i915_request *to, &from->fence, 0, I915_FENCE_GFP); + err = i915_sw_fence_await_dma_fence(&to->semaphore, + &from->fence, 0, + I915_FENCE_GFP); + if (err < 0) + return err; + /* We need to pin the signaler's HWSP until we are finished reading. */ err = i915_timeline_read_hwsp(from, to, &hwsp_offset); if (err) @@ -1114,6 +1151,7 @@ void i915_request_add(struct i915_request *request) * run at the earliest possible convenience. */ local_bh_disable(); + i915_sw_fence_commit(&request->semaphore); rcu_read_lock(); /* RCU serialisation for set-wedged protection */ if (engine->schedule) { struct i915_sched_attr attr = request->gem_context->sched; @@ -1320,7 +1358,9 @@ long i915_request_wait(struct i915_request *rq, if (flags & I915_WAIT_PRIORITY) { if (!i915_request_started(rq) && INTEL_GEN(rq->i915) >= 6) gen6_rps_boost(rq); + local_bh_disable(); /* suspend tasklets for reprioritisation */ i915_schedule_bump_priority(rq, I915_PRIORITY_WAIT); + local_bh_enable(); /* kick tasklets en masse */ } wait.tsk = current; |