linux-kernel - [PATCH 3.13.y-ckt 006/103] drm/i915: Force the CS stall for invalidate flushes

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Date:	Wed, 18 Feb 2015 16:31:33 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Simon Farnsworth <simon@...nz.org.uk>,
	Daniel Vetter <daniel@...ll.ch>,
	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Jani Nikula <jani.nikula@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 006/103] drm/i915: Force the CS stall for invalidate flushes

3.13.11-ckt16 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Wilson <chris@...is-wilson.co.uk>

commit add284a3a2481e759d6bec35f6444c32c8ddc383 upstream.

In order to act as a full command barrier by itself, we need to tell the
pipecontrol to actually stall the command streamer while the flush runs.
We require the full command barrier before operations like
MI_SET_CONTEXT, which currently rely on a prior invalidate flush.

References: https://bugs.freedesktop.org/show_bug.cgi?id=83677
Cc: Simon Farnsworth <simon@...nz.org.uk>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.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 d124b26..a6de7c6 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -339,6 +339,8 @@ gen7_render_ring_flush(struct intel_ring_buffer *ring,
 		flags |= PIPE_CONTROL_QW_WRITE;
 		flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
 
+		flags |= PIPE_CONTROL_STALL_AT_SCOREBOARD;
+
 		/* Workaround: we must issue a pipe_control with CS-stall bit
 		 * set before a pipe_control command that has the state cache
 		 * invalidate bit set. */
-- 
1.9.1

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