From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 28 Aug 2014 14:59:05 +0000 (-0400)
Subject: drm/radeon: add RADEON_GEM_NO_CPU_ACCESS BO creation flag (v4)
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f266f04d33e5265e2f61ffc9d2b2f97214804995;p=linux-beck.git

drm/radeon: add RADEON_GEM_NO_CPU_ACCESS BO creation flag (v4)

Allows pinning of buffers in the non-CPU visible portion of
vram.

v2: incorporate Michel's comments.
v3: rebase on Michel's patch
v4: rebase on Michel's v2 patch

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
---

diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 3dbbd65336d5..8abee5fa93bd 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -313,6 +313,7 @@ int radeon_bo_pin_restricted(struct radeon_bo *bo, u32 domain, u64 max_offset,
 	for (i = 0; i < bo->placement.num_placement; i++) {
 		/* force to pin into visible video ram */
 		if ((bo->placements[i].flags & TTM_PL_FLAG_VRAM) &&
+		    !(bo->flags & RADEON_GEM_NO_CPU_ACCESS) &&
 		    (!max_offset || max_offset > bo->rdev->mc.visible_vram_size))
 			bo->placements[i].lpfn =
 				bo->rdev->mc.visible_vram_size >> PAGE_SHIFT;
diff --git a/include/uapi/drm/radeon_drm.h b/include/uapi/drm/radeon_drm.h
index f755f20d2b5c..50d0fb41a3bf 100644
--- a/include/uapi/drm/radeon_drm.h
+++ b/include/uapi/drm/radeon_drm.h
@@ -803,6 +803,8 @@ struct drm_radeon_gem_info {
 #define RADEON_GEM_GTT_WC		(1 << 2)
 /* BO is expected to be accessed by the CPU */
 #define RADEON_GEM_CPU_ACCESS		(1 << 3)
+/* CPU access is not expected to work for this BO */
+#define RADEON_GEM_NO_CPU_ACCESS	(1 << 4)
 
 struct drm_radeon_gem_create {
 	uint64_t	size;