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| author | Samuel Li <samuel.li@amd.com> | 2013-04-08 17:25:47 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2013-04-09 10:31:31 -0400 |
| commit | a0a53aa8c7b491a43e2ef66786f9511bae8cbc35 (patch) | |
| tree | ba99c19682038634fece39989fef348baaebab1b /include/uapi/drm | |
| parent | 7c1c7c18fc752b2a1d07597286467ef186312463 (diff) | |
| download | linux-a0a53aa8c7b491a43e2ef66786f9511bae8cbc35.tar.gz linux-a0a53aa8c7b491a43e2ef66786f9511bae8cbc35.tar.bz2 linux-a0a53aa8c7b491a43e2ef66786f9511bae8cbc35.zip | |
drm/radeon: Use direct mapping for fast fb access on RS690
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>
Diffstat (limited to 'include/uapi/drm')
| -rw-r--r-- | include/uapi/drm/radeon_drm.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/drm/radeon_drm.h b/include/uapi/drm/radeon_drm.h index eeda91774c8a..6fd25563f301 100644 --- a/include/uapi/drm/radeon_drm.h +++ b/include/uapi/drm/radeon_drm.h @@ -972,6 +972,9 @@ struct drm_radeon_cs { #define RADEON_INFO_MAX_SE 0x12 /* max SH per SE */ #define RADEON_INFO_MAX_SH_PER_SE 0x13 +/* fast fb access is enabled */ +#define RADEON_INFO_FASTFB_WORKING 0x14 + struct drm_radeon_info { uint32_t request; |