drm/nouveau: Implement intersect/compatible functions

Implemented a new intersect and compatible callback function
fetching the start offset from struct ttm_resource.
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220820073304.178444-5-Arunpravin.PaneerSelvam@amd.com

drivers/gpu/drm/nouveau/nouveau_mem.c

@@ -187,3 +187,32 @@ nouveau_mem_new(struct nouveau_cli *cli, u8 kind, u8 comp,
 	*res = &mem->base;
 	return 0;
 }
+
+bool
+nouveau_mem_intersects(struct ttm_resource *res,
+		       const struct ttm_place *place,
+		       size_t size)
+{
+	u32 num_pages = PFN_UP(size);
+
+	/* Don't evict BOs outside of the requested placement range */
+	if (place->fpfn >= (res->start + num_pages) ||
+	    (place->lpfn && place->lpfn <= res->start))
+		return false;
+
+	return true;
+}
+
+bool
+nouveau_mem_compatible(struct ttm_resource *res,
+		       const struct ttm_place *place,
+		       size_t size)
+{
+	u32 num_pages = PFN_UP(size);
+
+	if (res->start < place->fpfn ||
+	    (place->lpfn && (res->start + num_pages) > place->lpfn))
+		return false;
+
+	return true;
+}

drivers/gpu/drm/nouveau/nouveau_mem.h

@@ -25,6 +25,12 @@ int nouveau_mem_new(struct nouveau_cli *, u8 kind, u8 comp,
 		    struct ttm_resource **);
 void nouveau_mem_del(struct ttm_resource_manager *man,
 		     struct ttm_resource *);
+bool nouveau_mem_intersects(struct ttm_resource *res,
+			    const struct ttm_place *place,
+			    size_t size);
+bool nouveau_mem_compatible(struct ttm_resource *res,
+			    const struct ttm_place *place,
+			    size_t size);
 int nouveau_mem_vram(struct ttm_resource *, bool contig, u8 page);
 int nouveau_mem_host(struct ttm_resource *, struct ttm_tt *);
 void nouveau_mem_fini(struct nouveau_mem *);

drivers/gpu/drm/nouveau/nouveau_ttm.c

@@ -42,6 +42,24 @@ nouveau_manager_del(struct ttm_resource_manager *man,
 	nouveau_mem_del(man, reg);
 }
 
+static bool
+nouveau_manager_intersects(struct ttm_resource_manager *man,
+			   struct ttm_resource *res,
+			   const struct ttm_place *place,
+			   size_t size)
+{
+	return nouveau_mem_intersects(res, place, size);
+}
+
+static bool
+nouveau_manager_compatible(struct ttm_resource_manager *man,
+			   struct ttm_resource *res,
+			   const struct ttm_place *place,
+			   size_t size)
+{
+	return nouveau_mem_compatible(res, place, size);
+}
+
 static int
 nouveau_vram_manager_new(struct ttm_resource_manager *man,
 			 struct ttm_buffer_object *bo,
@@ -73,6 +91,8 @@ nouveau_vram_manager_new(struct ttm_resource_manager *man,
 const struct ttm_resource_manager_func nouveau_vram_manager = {
 	.alloc = nouveau_vram_manager_new,
 	.free = nouveau_manager_del,
+	.intersects = nouveau_manager_intersects,
+	.compatible = nouveau_manager_compatible,
 };
 
 static int
@@ -97,6 +117,8 @@ nouveau_gart_manager_new(struct ttm_resource_manager *man,
 const struct ttm_resource_manager_func nouveau_gart_manager = {
 	.alloc = nouveau_gart_manager_new,
 	.free = nouveau_manager_del,
+	.intersects = nouveau_manager_intersects,
+	.compatible = nouveau_manager_compatible,
 };
 
 static int
@@ -130,6 +152,8 @@ nv04_gart_manager_new(struct ttm_resource_manager *man,
 const struct ttm_resource_manager_func nv04_gart_manager = {
 	.alloc = nv04_gart_manager_new,
 	.free = nouveau_manager_del,
+	.intersects = nouveau_manager_intersects,
+	.compatible = nouveau_manager_compatible,
 };
 
 static int