From dcfe050659bbd02e3b18d4b19eb0bcc8d0072bb0 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 5 May 2014 09:07:32 +0100 Subject: [PATCH] drm/i915: Improve fallback ring waiting A few improvements to the fallback method for waiting upon ring space: 1. Fix the start/end wait tracepoints to always be paired. 2. Increase responsiveness of checking 3. Mark the process as waiting upon io 4. Check for signal interruptions Signed-off-by: Chris Wilson Reviewed-by: Brad Volkin [danvet: Drop the s/msleep/io_schedule_timeout/ change again since the latter isn't exported.] Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_ringbuffer.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 40a7aa4db589..e6c7a4dfea51 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1546,7 +1546,6 @@ static int ring_wait_for_space(struct intel_ring_buffer *ring, int n) /* force the tail write in case we have been skipping them */ __intel_ring_advance(ring); - trace_i915_ring_wait_begin(ring); /* With GEM the hangcheck timer should kick us out of the loop, * leaving it early runs the risk of corrupting GEM state (due * to running on almost untested codepaths). But on resume @@ -1554,12 +1553,13 @@ static int ring_wait_for_space(struct intel_ring_buffer *ring, int n) * case by choosing an insanely large timeout. */ end = jiffies + 60 * HZ; + trace_i915_ring_wait_begin(ring); do { ring->head = I915_READ_HEAD(ring); ring->space = ring_space(ring); if (ring->space >= n) { - trace_i915_ring_wait_end(ring); - return 0; + ret = 0; + break; } if (!drm_core_check_feature(dev, DRIVER_MODESET) && @@ -1571,13 +1571,23 @@ static int ring_wait_for_space(struct intel_ring_buffer *ring, int n) msleep(1); + if (dev_priv->mm.interruptible && signal_pending(current)) { + ret = -ERESTARTSYS; + break; + } + ret = i915_gem_check_wedge(&dev_priv->gpu_error, dev_priv->mm.interruptible); if (ret) - return ret; - } while (!time_after(jiffies, end)); + break; + + if (time_after(jiffies, end)) { + ret = -EBUSY; + break; + } + } while (1); trace_i915_ring_wait_end(ring); - return -EBUSY; + return ret; } static int intel_wrap_ring_buffer(struct intel_ring_buffer *ring) -- GitLab