From 8e0fe1b090f75e5b7cadc9c316d1a9e3668c8ed2 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 28 Aug 2014 10:59:05 -0400
Subject: [PATCH] drm/radeon: add RADEON_GEM_NO_CPU_ACCESS BO creation flag
(v2)
Allows pinning of buffers in the non-CPU visible portion of
vram.
v2: incorporate Michel's comments.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/radeon/radeon_object.c | 8 +++++---
include/uapi/drm/radeon_drm.h | 2 ++
2 files changed, 7 insertions(+), 3 deletions(-)
@@ -314,10 +314,12 @@ int radeon_bo_pin_restricted(struct radeon_bo *bo, u32 domain, u64 max_offset,
unsigned lpfn = 0;
/* force to pin into visible video ram */
- if (bo->placements[i].flags & TTM_PL_FLAG_VRAM)
- lpfn = bo->rdev->mc.visible_vram_size >> PAGE_SHIFT;
- else
+ if (bo->placements[i].flags & TTM_PL_FLAG_VRAM) {
+ if (!(bo->flags & RADEON_GEM_NO_CPU_ACCESS))
+ lpfn = bo->rdev->mc.visible_vram_size >> PAGE_SHIFT;
+ } else {
lpfn = bo->rdev->mc.gtt_size >> PAGE_SHIFT; /* ??? */
+ }
if (max_offset)
lpfn = min (lpfn, (unsigned)(max_offset >> PAGE_SHIFT));
@@ -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;
--
1.8.3.1