drm/radeon: add userptr flag to directly validate the BO to GTT

This way we test userptr availability at BO creation time instead of first use.
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_gem.c

@@ -291,7 +291,7 @@ int radeon_gem_userptr_ioctl(struct drm_device *dev, void *data,
 
 	/* reject unknown flag values */
 	if (args->flags & ~(RADEON_GEM_USERPTR_READONLY |
-	    RADEON_GEM_USERPTR_ANONONLY))
+	    RADEON_GEM_USERPTR_ANONONLY | RADEON_GEM_USERPTR_VALIDATE))
 		return -EINVAL;
 
 	/* readonly pages not tested on older hardware */
@@ -312,6 +312,22 @@ int radeon_gem_userptr_ioctl(struct drm_device *dev, void *data,
 	if (r)
 		goto release_object;
 
+	if (args->flags & RADEON_GEM_USERPTR_VALIDATE) {
+		down_read(&current->mm->mmap_sem);
+		r = radeon_bo_reserve(bo, true);
+		if (r) {
+			up_read(&current->mm->mmap_sem);
+			goto release_object;
+		}
+
+		radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_GTT);
+		r = ttm_bo_validate(&bo->tbo, &bo->placement, true, false);
+		radeon_bo_unreserve(bo);
+		up_read(&current->mm->mmap_sem);
+		if (r)
+			goto release_object;
+	}
+
 	r = drm_gem_handle_create(filp, gobj, &handle);
 	/* drop reference from allocate - handle holds it now */
 	drm_gem_object_unreference_unlocked(gobj);

include/uapi/drm/radeon_drm.h

@@ -817,6 +817,7 @@ struct drm_radeon_gem_create {
  */
 #define RADEON_GEM_USERPTR_READONLY	(1 << 0)
 #define RADEON_GEM_USERPTR_ANONONLY	(1 << 1)
+#define RADEON_GEM_USERPTR_VALIDATE	(1 << 2)
 
 struct drm_radeon_gem_userptr {
 	uint64_t		addr;