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drm/radeon: TTM must be init with cpu-visible VRAM, v2

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commit 14eedc32a3 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@gmx.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lauri Kasanen 2014-02-28 20:50:23 +02:00 committed by Greg Kroah-Hartman
parent eb11b51a8c
commit 3d74ef5bc0
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/radeon/radeon_ttm.c
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@ -712,6 +712,9 @@ int radeon_ttm_init(struct radeon_device *rdev)
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);