drm/ttm: Print the memory decryption status just once

Stop printing the TT memory decryption status info each time tt is created
and instead print it just once.

Reduces the spam in the system logs when running guests with SEV enabled.

Signed-off-by: Zack Rusin <[email protected]>
Fixes: 71ce046 ("drm/ttm: Make sure the mapped tt pages are decrypted when needed")
Reviewed-by: Christian König <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: <[email protected]> # v5.14+
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

drivers/gpu/drm/ttm/ttm_tt.c

@@ -92,7 +92,7 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
 	 */
 	if (bdev->pool.use_dma_alloc && cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
 		page_flags |= TTM_TT_FLAG_DECRYPTED;
-		drm_info(ddev, "TT memory decryption enabled.");
+		drm_info_once(ddev, "TT memory decryption enabled.");
 	}
 
 	bo->ttm = bdev->funcs->ttm_tt_create(bo, page_flags);