drm/radeon: Add RADEON_GEM_CPU_ACCESS BO creation flag
This flag is a hint that userspace expects the BO to be accessed by the
CPU. We can use that hint to prevent such BOs from ever being stored in
the CPU inaccessible part of VRAM.
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index aadbd36..eef60aa 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -144,7 +144,12 @@
for (i = 0; i < c; ++i) {
rbo->placements[i].fpfn = 0;
- rbo->placements[i].lpfn = 0;
+ if ((rbo->flags & RADEON_GEM_CPU_ACCESS) &&
+ (rbo->placements[i].flags & TTM_PL_FLAG_VRAM))
+ rbo->placements[i].lpfn =
+ rbo->rdev->mc.visible_vram_size >> PAGE_SHIFT;
+ else
+ rbo->placements[i].lpfn = 0;
}
/*
@@ -152,7 +157,9 @@
* improve fragmentation quality.
* 512kb was measured as the most optimal number.
*/
- if (rbo->tbo.mem.size > 512 * 1024) {
+ if (!((rbo->flags & RADEON_GEM_CPU_ACCESS) &&
+ (rbo->placements[i].flags & TTM_PL_FLAG_VRAM)) &&
+ rbo->tbo.mem.size > 512 * 1024) {
for (i = 0; i < c; i++) {
rbo->placements[i].flags |= TTM_PL_FLAG_TOPDOWN;
}