diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_request.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_request.c | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c index 813a3b546d6e..4eb1a76731b2 100644 --- a/drivers/gpu/drm/i915/i915_gem_request.c +++ b/drivers/gpu/drm/i915/i915_gem_request.c @@ -1021,12 +1021,28 @@ static bool busywait_stop(unsigned long timeout, unsigned int cpu) return this_cpu != cpu; } -bool __i915_spin_request(const struct drm_i915_gem_request *req, - u32 seqno, int state, unsigned long timeout_us) +static bool __i915_spin_request(const struct drm_i915_gem_request *req, + u32 seqno, int state, unsigned long timeout_us) { struct intel_engine_cs *engine = req->engine; unsigned int irq, cpu; + GEM_BUG_ON(!seqno); + + /* + * Only wait for the request if we know it is likely to complete. + * + * We don't track the timestamps around requests, nor the average + * request length, so we do not have a good indicator that this + * request will complete within the timeout. What we do know is the + * order in which requests are executed by the engine and so we can + * tell if the request has started. If the request hasn't started yet, + * it is a fair assumption that it will not complete within our + * relatively short timeout. + */ + if (!i915_seqno_passed(intel_engine_get_seqno(engine), seqno - 1)) + return false; + /* When waiting for high frequency requests, e.g. during synchronous * rendering split between the CPU and GPU, the finite amount of time * required to set up the irq and wait upon it limits the response @@ -1040,12 +1056,8 @@ bool __i915_spin_request(const struct drm_i915_gem_request *req, irq = atomic_read(&engine->irq_count); timeout_us += local_clock_us(&cpu); do { - if (seqno != i915_gem_request_global_seqno(req)) - break; - - if (i915_seqno_passed(intel_engine_get_seqno(req->engine), - seqno)) - return true; + if (i915_seqno_passed(intel_engine_get_seqno(engine), seqno)) + return seqno == i915_gem_request_global_seqno(req); /* Seqno are meant to be ordered *before* the interrupt. If * we see an interrupt without a corresponding seqno advance, @@ -1156,7 +1168,7 @@ restart: GEM_BUG_ON(!i915_sw_fence_signaled(&req->submit)); /* Optimistic short spin before touching IRQs */ - if (i915_spin_request(req, state, 5)) + if (__i915_spin_request(req, wait.seqno, state, 5)) goto complete; set_current_state(state); @@ -1213,7 +1225,7 @@ wakeup: continue; /* Only spin if we know the GPU is processing this request */ - if (i915_spin_request(req, state, 2)) + if (__i915_spin_request(req, wait.seqno, state, 2)) break; if (!intel_wait_check_request(&wait, req)) { |