[PATCH 04/67] drm/i915: Pin the ring high

[Chris Wilson]

If we can use an unmappable ring, try to pin it out of the mappable
aperture. This simple layout preference is to try and keep the mappable
aperture reserved and available to handle GGTT mmapping requests from
userspace without causing evictions and GPU stalls.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8f19349a6055..cd4fb796d97d 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1033,6 +1033,8 @@ int intel_ring_pin(struct intel_ring *ring,
 		flags |= PIN_OFFSET_BIAS | offset_bias;
 	if (vma->obj->stolen)
 		flags |= PIN_MAPPABLE;
+	else
+		flags |= PIN_HIGH;
 
 	if (!(vma->flags & I915_VMA_GLOBAL_BIND)) {
 		if (flags & PIN_MAPPABLE || map == I915_MAP_WC)
-- 
2.17.0