[Intel-gfx] [PATCH 3/7] drm/i915: Assert that device info bitmasks have enough bits

[Lucas De Marchi]

On Thu, May 11, 2023 at 07:55:30PM +0300, Ville Syrjälä wrote:
>From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
>Sprinkle in some BUILD_BUG_ON()s to make sure some of
>the bitmasks used in the device info have enough bits.
>
>Do we have a better place for this sort of stuff?

it's being moved to display/, so I'd say the intel_display_device_info.c
is a better place. What about using a static_assert() and leave them
near the top of the file?

Lucas De Marchi

>
>Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
>---
> drivers/gpu/drm/i915/intel_device_info.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
>index bb10e8e78a94..ce257446b712 100644
>--- a/drivers/gpu/drm/i915/intel_device_info.c
>+++ b/drivers/gpu/drm/i915/intel_device_info.c
>@@ -414,6 +414,10 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
> 	struct intel_runtime_info *runtime = RUNTIME_INFO(dev_priv);
> 	enum pipe pipe;
>
>+	BUILD_BUG_ON(BITS_PER_TYPE(runtime->pipe_mask) < I915_MAX_PIPES);
>+	BUILD_BUG_ON(BITS_PER_TYPE(runtime->cpu_transcoder_mask) < I915_MAX_TRANSCODERS);
>+	BUILD_BUG_ON(BITS_PER_TYPE(runtime->port_mask) < I915_MAX_PORTS);
>+
> 	/* Wa_14011765242: adl-s A0,A1 */
> 	if (IS_ADLS_DISPLAY_STEP(dev_priv, STEP_A0, STEP_A2))
> 		for_each_pipe(dev_priv, pipe)
>-- 
>2.39.3
>