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drm/radeon: Use direct mapping for fast fb access on RS690

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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>
This commit is contained in:
Samuel Li 2013-04-08 17:25:47 -04:00 • committed by Alex Deucher
parent 7c1c7c18fc
commit a0a53aa8c7
7 changed files with 43 additions and 2 deletions
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3
include/uapi/drm/radeon_drm.h
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@ -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;