From a0a53aa8c7b491a43e2ef66786f9511bae8cbc35 Mon Sep 17 00:00:00 2001 From: Samuel Li Date: Mon, 8 Apr 2013 17:25:47 -0400 Subject: drm/radeon: Use direct mapping for fast fb access on RS690 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch allows the CPU to map the stolen vram segment directly rather than going through the PCI BAR. This significantly improves performance for certain workloads with a properly patched ddx. Use radeon.fastfb=1 to enable it (disabled by default). Currently only supported on RS690, but support for RS780/880 and newer APUs may be added eventually. Signed-off-by: Samuel Li Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/radeon_object.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/radeon/radeon_object.c') diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c index d3aface2d12d..58e026afec17 100644 --- a/drivers/gpu/drm/radeon/radeon_object.c +++ b/drivers/gpu/drm/radeon/radeon_object.c @@ -321,8 +321,10 @@ void radeon_bo_force_delete(struct radeon_device *rdev) int radeon_bo_init(struct radeon_device *rdev) { /* Add an MTRR for the VRAM */ - rdev->mc.vram_mtrr = mtrr_add(rdev->mc.aper_base, rdev->mc.aper_size, + if (!rdev->fastfb_working) { + rdev->mc.vram_mtrr = mtrr_add(rdev->mc.aper_base, rdev->mc.aper_size, MTRR_TYPE_WRCOMB, 1); + } DRM_INFO("Detected VRAM RAM=%lluM, BAR=%lluM\n", rdev->mc.mc_vram_size >> 20, (unsigned long long)rdev->mc.aper_size >> 20); -- cgit v1.2.3