From 02f6a1e750df8201561171c47472435557a65864 Mon Sep 17 00:00:00 2001 From: Naresh Kumar Kachhi Date: Wed, 12 Mar 2014 16:39:42 +0530 Subject: [PATCH] drm/i915: warn if ring is active before sync flush Based on Bspec the command parser must be stopped prior to issuing sync flush. This should be done by the caller of intel_ring_setup_status_page. Patch adds a warning if it is not done. v2: rebased based on new patch (wait for ring to become idle) Signed-off-by: Naresh Kumar Kachhi Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_ringbuffer.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 617634b6a6c2..c50388a86bca 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -984,6 +984,10 @@ void intel_ring_setup_status_page(struct intel_ring_buffer *ring) /* Flush the TLB for this page */ if (INTEL_INFO(dev)->gen >= 6) { u32 reg = RING_INSTPM(ring->mmio_base); + + /* ring should be idle before issuing a sync flush*/ + WARN_ON((I915_READ_MODE(ring) & MODE_IDLE) == 0); + I915_WRITE(reg, _MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE | INSTPM_SYNC_FLUSH)); -- 2.20.1