From a0a53aa8c7b491a43e2ef66786f9511bae8cbc35 Mon Sep 17 00:00:00 2001 From: Samuel Li <samuel.li@amd.com> 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 <samuel.li@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> --- drivers/gpu/drm/radeon/rs690d.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/gpu/drm/radeon/rs690d.h') diff --git a/drivers/gpu/drm/radeon/rs690d.h b/drivers/gpu/drm/radeon/rs690d.h index 36e6398..8af3ccf 100644 --- a/drivers/gpu/drm/radeon/rs690d.h +++ b/drivers/gpu/drm/radeon/rs690d.h @@ -29,6 +29,9 @@ #define __RS690D_H__ /* Registers */ +#define R_00001E_K8_FB_LOCATION 0x00001E +#define R_00005F_MC_MISC_UMA_CNTL 0x00005F +#define G_00005F_K8_ADDR_EXT(x) (((x) >> 0) & 0xFF) #define R_000078_MC_INDEX 0x000078 #define S_000078_MC_IND_ADDR(x) (((x) & 0x1FF) << 0) #define G_000078_MC_IND_ADDR(x) (((x) >> 0) & 0x1FF) -- cgit v1.1