r600g: delay mapping until first map request. (v2)

Currently r600g always maps every bo, this is quite pointless as it wastes
VM and on 32-bit with wine running VM space is quite useful.

So with this patch we don't create the mappings until first use, without
tiling enabled this probably won't make a major difference on its own,
but with tiled staged uploads it should avoid keeping maps for most of the
textures unnecessarily.

v2: add bo data ptr check

Signed-off-by: Dave Airlie <airlied@redhat.com>

src/gallium/winsys/r600/drm/r600_priv.h

@@ -145,6 +145,7 @@ int radeon_bo_get_tiling_flags(struct radeon *radeon,
 int radeon_bo_get_name(struct radeon *radeon,
 		       struct radeon_bo *bo,
 		       uint32_t *name);
+int radeon_bo_fixed_map(struct radeon *radeon, struct radeon_bo *bo);
 
 /*
  * r600_hw_context.c
@@ -192,6 +193,8 @@ struct r600_bo *r600_bomgr_bo_create(struct r600_bomgr *mgr,
  */
 static inline int radeon_bo_map(struct radeon *radeon, struct radeon_bo *bo)
 {
+	if (bo->map_count == 0 && !bo->data)
+		return radeon_bo_fixed_map(radeon, bo);
 	bo->map_count++;
 	return 0;
 }

src/gallium/winsys/r600/drm/radeon_bo.c

@@ -33,7 +33,7 @@
 #include "xf86drm.h"
 #include "radeon_drm.h"
 
-static int radeon_bo_fixed_map(struct radeon *radeon, struct radeon_bo *bo)
+int radeon_bo_fixed_map(struct radeon *radeon, struct radeon_bo *bo)
 {
 	struct drm_radeon_gem_mmap args;
 	void *ptr;
@@ -127,11 +127,6 @@ struct radeon_bo *radeon_bo(struct radeon *radeon, unsigned handle,
 			return NULL;
 		}
 	}
-	if (radeon_bo_fixed_map(radeon, bo)) {
-		R600_ERR("failed to map bo\n");
-		radeon_bo_reference(radeon, &bo, NULL);
-		return bo;
-	}
 
 	if (handle)
 		util_hash_table_set(radeon->bo_handles, (void *)(uintptr_t)handle, bo);