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

[Chris Wilson]

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>
---
 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