3 files changed, 28 insertions, 1 deletions
diff --git a/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c b/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c
index 6ec7cb79043..9ab8f67cbc7 100644
--- a/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c
+++ b/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c
@@ -386,7 +386,9 @@ static struct amdgpu_winsys_bo *amdgpu_create_bo(struct amdgpu_winsys *ws,
    unsigned va_gap_size;
    int r;
 
-   assert(initial_domain & RADEON_DOMAIN_VRAM_GTT);
+   /* VRAM or GTT must be specified, but not both at the same time. */
+   assert(util_bitcount(initial_domain & RADEON_DOMAIN_VRAM_GTT) == 1);
+
    bo = CALLOC_STRUCT(amdgpu_winsys_bo);
    if (!bo) {
       return NULL;
@@ -402,6 +404,16 @@ static struct amdgpu_winsys_bo *amdgpu_create_bo(struct amdgpu_winsys *ws,
    if (initial_domain & RADEON_DOMAIN_GTT)
       request.preferred_heap |= AMDGPU_GEM_DOMAIN_GTT;
 
+   /* If VRAM is just stolen system memory, allow both VRAM and
+    * GTT, whichever has free space. If a buffer is evicted from
+    * VRAM to GTT, it will stay there.
+    *
+    * DRM 3.6.0 has good BO move throttling, so we can allow VRAM-only
+    * placements even with a low amount of stolen VRAM.
+    */
+   if (!ws->info.has_dedicated_vram && ws->info.drm_minor < 6)
+      request.preferred_heap |= AMDGPU_GEM_DOMAIN_GTT;
+
    if (flags & RADEON_FLAG_NO_CPU_ACCESS)
       request.flags |= AMDGPU_GEM_CREATE_NO_CPU_ACCESS;
    if (flags & RADEON_FLAG_GTT_WC)
diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
index 87c3f1e1006..fc95a98620b 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
@@ -609,6 +609,13 @@ static struct radeon_bo *radeon_create_bo(struct radeon_drm_winsys *rws,
     args.initial_domain = initial_domains;
     args.flags = 0;
 
+    /* If VRAM is just stolen system memory, allow both VRAM and
+     * GTT, whichever has free space. If a buffer is evicted from
+     * VRAM to GTT, it will stay there.
+     */
+    if (!rws->info.has_dedicated_vram)
+        args.initial_domain |= RADEON_DOMAIN_GTT;
+
     if (flags & RADEON_FLAG_GTT_WC)
         args.flags |= RADEON_GEM_GTT_WC;
     if (flags & RADEON_FLAG_NO_CPU_ACCESS)
diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_cs.c b/src/gallium/winsys/radeon/drm/radeon_drm_cs.c
index c3398d0f589..92452e47fb1 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_cs.c
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_cs.c
@@ -338,6 +338,14 @@ static unsigned radeon_drm_cs_add_buffer(struct radeon_winsys_cs *rcs,
     struct radeon_drm_cs *cs = radeon_drm_cs(rcs);
     struct radeon_bo *bo = (struct radeon_bo*)buf;
     enum radeon_bo_domain added_domains;
+
+    /* If VRAM is just stolen system memory, allow both VRAM and
+     * GTT, whichever has free space. If a buffer is evicted from
+     * VRAM to GTT, it will stay there.
+     */
+    if (!cs->ws->info.has_dedicated_vram)
+        domains |= RADEON_DOMAIN_GTT;
+
     enum radeon_bo_domain rd = usage & RADEON_USAGE_READ ? domains : 0;
     enum radeon_bo_domain wd = usage & RADEON_USAGE_WRITE ? domains : 0;
     struct drm_radeon_cs_reloc *reloc;