From 74c1c694a2deab0561c1f502de9d32fdc7eb7b32 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 21 Sep 2017 12:01:35 +0100 Subject: [PATCH] drm/i915: Document the split in internal and public execbuf flags Since we reuse the same field for the user passing in their control flags, and for the kernel to track a couple of bits of state, document and check that those do not overlap. Suggested-by: Tvrtko Ursulin Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Cc: Joonas Lahtinen Link: https://patchwork.freedesktop.org/patch/msgid/20170921110135.15990-1-chris@chris-wilson.co.uk Reviewed-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index 214a850b4b3c..61b9b079c8c8 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -58,6 +58,7 @@ enum { #define __EXEC_HAS_RELOC BIT(31) #define __EXEC_VALIDATED BIT(30) +#define __EXEC_INTERNAL_FLAGS (~0u << 30) #define UPDATE PIN_OFFSET_FIXED #define BATCH_OFFSET_BIAS (256*1024) @@ -2185,6 +2186,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, int out_fence_fd = -1; int err; + BUILD_BUG_ON(__EXEC_INTERNAL_FLAGS & ~__I915_EXEC_ILLEGAL_FLAGS); BUILD_BUG_ON(__EXEC_OBJECT_INTERNAL_FLAGS & ~__EXEC_OBJECT_UNKNOWN_FLAGS); -- GitLab