linux-kernel - [PATCH 3.19.y-ckt 070/102] drm/i915: Flag the execlists context object as dirty after every use

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Message-Id: <1442944358-1248-71-git-send-email-kamal@canonical.com>
Date:	Tue, 22 Sep 2015 10:52:06 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	Jani Nikula <jani.nikula@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 070/102] drm/i915: Flag the execlists context object as dirty after every use

3.19.8-ckt7 -stable review patch.  If anyone has any objections, please let me know.

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

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

commit 903ecd0bb970438c3a60c2c33ec9032d6443bf67 upstream.

Everytime we use the logical context with execlists it becomes dirty (as
the hardware will write the new register values afterwards, as well as
the GPU state that will be used). We need to then flag the context as
dirty everytime since after a swap-out/swap-in cycle the dirty flag will
be cleared, and a further swap-out cycle will then loose the most recent
GPU state.

Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 5ebe805..2c5c00c 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -849,6 +849,8 @@ static int intel_lr_context_pin(struct intel_engine_cs *ring,
 		ret = intel_pin_and_map_ringbuffer_obj(ring->dev, ringbuf);
 		if (ret)
 			goto unpin_ctx_obj;
+
+		ctx_obj->dirty = true;
 	}
 
 	return ret;
-- 
1.9.1

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