This is a note to let you know that I've just added the patch titled
drm/radeon: TTM must be init with cpu-visible VRAM, v2
to the 3.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-ttm-must-be-init-with-cpu-visible-vram-v2.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 14eedc32a3c0ec9dd70448a73763ee21feae3111 Mon Sep 17 00:00:00 2001
From: Lauri Kasanen <cand@xxxxxxx>
Date: Fri, 28 Feb 2014 20:50:23 +0200
Subject: drm/radeon: TTM must be init with cpu-visible VRAM, v2
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From: Lauri Kasanen <cand@xxxxxxx>
commit 14eedc32a3c0ec9dd70448a73763ee21feae3111 upstream.
Without this, a bo may get created in the cpu-inaccessible vram.
Before the CP engines get setup, all copies are done via cpu memcpy.
This means that the cpu tries to read from inaccessible memory, fails,
and the radeon module proceeds to disable acceleration.
Doing this has no downsides, as the real VRAM size gets set as soon as the
CP engines get init.
This is a candidate for 3.14 fixes.
v2: Add comment on why the function is used
Signed-off-by: Lauri Kasanen <cand@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_ttm.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -712,6 +712,9 @@ int radeon_ttm_init(struct radeon_device
DRM_ERROR("Failed initializing VRAM heap.\n");
return r;
}
+ /* Change the size here instead of the init above so only lpfn is affected */
+ radeon_ttm_set_active_vram_size(rdev, rdev->mc.visible_vram_size);
+
r = radeon_bo_create(rdev, 256 * 1024, PAGE_SIZE, true,
RADEON_GEM_DOMAIN_VRAM,
NULL, &rdev->stollen_vga_memory);
Patches currently in stable-queue which might be from cand@xxxxxxx are
queue-3.13/drm-radeon-ttm-must-be-init-with-cpu-visible-vram-v2.patch
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