[Intel-gfx] [PATCH 11/42] drm/i915/bdw: Don't write PDP in the legacy way when using LRCs

[oscar.mateo at intel.com]

From: Oscar Mateo <oscar.mateo at intel.com>

This is mostly for correctness so that we know we are running the LR
context correctly (this is, the PDPs are contained inside the context
object).

v2: Move the check to inside the enable PPGTT function. The switch
happens in two places: the legacy context switch (that we won't hit
when Execlists are enabled) and the PPGTT enable, which unfortunately
we need. This would look much nicer if the ppgtt->enable was part of
the ring init, where it logically belongs.

Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index a4153ee..3b956e7 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -851,6 +851,11 @@ static int gen8_ppgtt_enable(struct i915_hw_ppgtt *ppgtt)
 		if (USES_FULL_PPGTT(dev))
 			continue;
 
+		/* In the case of Execlists, we don't want to write the PDPs
+		 * in the legacy way (they live inside the context now) */
+		if (i915.enable_execlists)
+			return 0;
+
 		ret = ppgtt->switch_mm(ppgtt, ring, true);
 		if (ret)
 			goto err_out;
-- 
1.9.0