[Intel-gfx] [PATCH] drm/i915: Introduce BITS_PER_TYPE

[Ville Syrjälä]

On Wed, Sep 26, 2018 at 11:47:07AM +0100, Chris Wilson wrote:
> Borrow the idea from net_dim.h to simplify the common determination of
> how many bits in a particular type (sizeof(type) * BITS_PER_BYTE).
> 
> Suggested-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Jani Nikula <jani.nikula at intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/i915_drv.c          | 4 ++--
>  drivers/gpu/drm/i915/i915_gem.c          | 2 +-
>  drivers/gpu/drm/i915/i915_query.c        | 2 +-
>  drivers/gpu/drm/i915/i915_syncmap.c      | 2 +-
>  drivers/gpu/drm/i915/i915_utils.h        | 2 +-
>  drivers/gpu/drm/i915/intel_device_info.c | 3 +--
>  drivers/gpu/drm/i915/intel_engine_cs.c   | 2 +-
>  7 files changed, 8 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 44e2c0f5ec50..ade9bca250fa 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1649,8 +1649,8 @@ i915_driver_create(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	device_info->device_id = pdev->device;
>  
>  	BUILD_BUG_ON(INTEL_MAX_PLATFORMS >
> -		     sizeof(device_info->platform_mask) * BITS_PER_BYTE);
> -	BUG_ON(device_info->gen > sizeof(device_info->gen_mask) * BITS_PER_BYTE);
> +		     BITS_PER_TYPE(device_info->platform_mask));
> +	BUG_ON(device_info->gen > BITS_PER_TYPE(device_info->gen_mask));
>  
>  	return i915;
>  }
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index db9688d14912..717f4321e987 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -5959,7 +5959,7 @@ void i915_gem_track_fb(struct drm_i915_gem_object *old,
>  	 * the bits.
>  	 */
>  	BUILD_BUG_ON(INTEL_FRONTBUFFER_BITS_PER_PIPE * I915_MAX_PIPES >
> -		     sizeof(atomic_t) * BITS_PER_BYTE);
> +		     BITS_PER_TYPE(atomic_t));
>  
>  	if (old) {
>  		WARN_ON(!(atomic_read(&old->frontbuffer_bits) & frontbuffer_bits));
> diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
> index 3f502eef2431..5821002cad42 100644
> --- a/drivers/gpu/drm/i915/i915_query.c
> +++ b/drivers/gpu/drm/i915/i915_query.c
> @@ -28,7 +28,7 @@ static int query_topology_info(struct drm_i915_private *dev_priv,
>  	slice_length = sizeof(sseu->slice_mask);
>  	subslice_length = sseu->max_slices *
>  		DIV_ROUND_UP(sseu->max_subslices,
> -			     sizeof(sseu->subslice_mask[0]) * BITS_PER_BYTE);
> +			     BITS_PER_TYPE(sseu->subslice_mask[0]));
>  	eu_length = sseu->max_slices * sseu->max_subslices *
>  		DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE);
>  
> diff --git a/drivers/gpu/drm/i915/i915_syncmap.c b/drivers/gpu/drm/i915/i915_syncmap.c
> index 58f8d0cc125c..60404dbb2e9f 100644
> --- a/drivers/gpu/drm/i915/i915_syncmap.c
> +++ b/drivers/gpu/drm/i915/i915_syncmap.c
> @@ -92,7 +92,7 @@ void i915_syncmap_init(struct i915_syncmap **root)
>  {
>  	BUILD_BUG_ON_NOT_POWER_OF_2(KSYNCMAP);
>  	BUILD_BUG_ON_NOT_POWER_OF_2(SHIFT);
> -	BUILD_BUG_ON(KSYNCMAP > BITS_PER_BYTE * sizeof((*root)->bitmap));
> +	BUILD_BUG_ON(KSYNCMAP > BITS_PER_TYPE((*root)->bitmap));
>  	*root = NULL;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
> index 395dd2511568..5858a43e19da 100644
> --- a/drivers/gpu/drm/i915/i915_utils.h
> +++ b/drivers/gpu/drm/i915/i915_utils.h
> @@ -68,7 +68,7 @@
>  
>  /* Note we don't consider signbits :| */
>  #define overflows_type(x, T) \
> -	(sizeof(x) > sizeof(T) && (x) >> (sizeof(T) * BITS_PER_BYTE))
> +	(sizeof(x) > sizeof(T) && (x) >> BITS_PER_TYPE(T))
>  
>  #define ptr_mask_bits(ptr, n) ({					\
>  	unsigned long __v = (unsigned long)(ptr);			\
> diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
> index 0ef0c6448d53..31f6be774833 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.c
> +++ b/drivers/gpu/drm/i915/intel_device_info.c
> @@ -750,8 +750,7 @@ void intel_device_info_runtime_init(struct intel_device_info *info)
>  		info->num_scalers[PIPE_C] = 1;
>  	}
>  
> -	BUILD_BUG_ON(I915_NUM_ENGINES >
> -		     sizeof(intel_ring_mask_t) * BITS_PER_BYTE);
> +	BUILD_BUG_ON(I915_NUM_ENGINES > BITS_PER_TYPE(intel_ring_mask_t));
>  
>  	/*
>  	 * Skylake and Broxton currently don't expose the topmost plane as its
> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
> index 217ed3ee1cab..6726d57f018f 100644
> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> @@ -335,7 +335,7 @@ int intel_engines_init_mmio(struct drm_i915_private *dev_priv)
>  
>  	WARN_ON(ring_mask == 0);
>  	WARN_ON(ring_mask &
> -		GENMASK(sizeof(mask) * BITS_PER_BYTE - 1, I915_NUM_ENGINES));
> +		GENMASK(BITS_PER_TYPE(mask) - 1, I915_NUM_ENGINES));
>  
>  	for (i = 0; i < ARRAY_SIZE(intel_engines); i++) {
>  		if (!HAS_ENGINE(dev_priv, i))
> -- 
> 2.19.0

-- 
Ville Syrjälä
Intel