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_kms.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/gpu/drm/radeon/radeon_kms.c') diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c index c75cb2c6ba71..f5464482dee8 100644 --- a/drivers/gpu/drm/radeon/radeon_kms.c +++ b/drivers/gpu/drm/radeon/radeon_kms.c @@ -376,6 +376,9 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) else return -EINVAL; break; + case RADEON_INFO_FASTFB_WORKING: + value = rdev->fastfb_working; + break; default: DRM_DEBUG_KMS("Invalid request %d\n", info->request); return -EINVAL; -- cgit v1.2.3-59-g8ed1b