drm/radeon: rework fallback handling v2

Let the CS module decide if we can fall back to VRAM or not.

v2: remove unintended change
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon.h

@@ -358,8 +358,9 @@ struct radeon_bo_list {
 	struct ttm_validate_buffer tv;
 	struct radeon_bo	*bo;
 	uint64_t		gpu_offset;
-	unsigned		rdomain;
-	unsigned		wdomain;
+	bool			written;
+	unsigned		domain;
+	unsigned		alt_domain;
 	u32			tiling_flags;
 };
 

drivers/gpu/drm/radeon/radeon_cs.c

@@ -53,6 +53,7 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
 	}
 	for (i = 0; i < p->nrelocs; i++) {
 		struct drm_radeon_cs_reloc *r;
+		uint32_t domain;
 
 		duplicate = false;
 		r = (struct drm_radeon_cs_reloc *)&chunk->kdata[i*4];
@@ -63,9 +64,12 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
 				break;
 			}
 		}
-		if (!duplicate) {
-			p->relocs[i].gobj = drm_gem_object_lookup(ddev,
-								  p->filp,
+		if (duplicate) {
+			p->relocs[i].handle = 0;
+			continue;
+		}
+
+		p->relocs[i].gobj = drm_gem_object_lookup(ddev, p->filp,
 							  r->handle);
 		if (p->relocs[i].gobj == NULL) {
 			DRM_ERROR("gem object lookup failed 0x%x\n",
@@ -75,16 +79,19 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
 		p->relocs_ptr[i] = &p->relocs[i];
 		p->relocs[i].robj = gem_to_radeon_bo(p->relocs[i].gobj);
 		p->relocs[i].lobj.bo = p->relocs[i].robj;
-			p->relocs[i].lobj.wdomain = r->write_domain;
-			p->relocs[i].lobj.rdomain = r->read_domains;
+		p->relocs[i].lobj.written = !!r->write_domain;
+
+		domain = r->write_domain ? r->write_domain : r->read_domains;
+		p->relocs[i].lobj.domain = domain;
+		if (domain == RADEON_GEM_DOMAIN_VRAM)
+			domain |= RADEON_GEM_DOMAIN_GTT;
+		p->relocs[i].lobj.alt_domain = domain;
+
 		p->relocs[i].lobj.tv.bo = &p->relocs[i].robj->tbo;
 		p->relocs[i].handle = r->handle;
-			p->relocs[i].flags = r->flags;
+
 		radeon_bo_list_add_object(&p->relocs[i].lobj,
 					  &p->validated);
-
-		} else
-			p->relocs[i].handle = 0;
 	}
 	return radeon_bo_list_validate(&p->validated);
 }

drivers/gpu/drm/radeon/radeon_object.c

@@ -341,7 +341,7 @@ void radeon_bo_fini(struct radeon_device *rdev)
 void radeon_bo_list_add_object(struct radeon_bo_list *lobj,
 				struct list_head *head)
 {
-	if (lobj->wdomain) {
+	if (lobj->written) {
 		list_add(&lobj->tv.head, head);
 	} else {
 		list_add_tail(&lobj->tv.head, head);
@@ -362,15 +362,15 @@ int radeon_bo_list_validate(struct list_head *head)
 	list_for_each_entry(lobj, head, tv.head) {
 		bo = lobj->bo;
 		if (!bo->pin_count) {
-			domain = lobj->wdomain ? lobj->wdomain : lobj->rdomain;
+			domain = lobj->domain;
 			
 		retry:
 			radeon_ttm_placement_from_domain(bo, domain);
 			r = ttm_bo_validate(&bo->tbo, &bo->placement,
 						true, false);
 			if (unlikely(r)) {
-				if (r != -ERESTARTSYS && domain == RADEON_GEM_DOMAIN_VRAM) {
-					domain |= RADEON_GEM_DOMAIN_GTT;
+				if (r != -ERESTARTSYS && domain != lobj->alt_domain) {
+					domain = lobj->alt_domain;
 					goto retry;
 				}
 				return r;