[Intel-gfx] [PATCH 1/3] drm/i915: Make IS_GENx macros work on a mask

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

If instead of numerical comparison me make these test a
bitmask, we enable the compiler to optimize all instances
of IS_GENx || IS_GENy.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c |  3 +++
 drivers/gpu/drm/i915/i915_drv.h | 17 +++++++++--------
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index ad7abe517700..01163da51b1d 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1071,6 +1071,9 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv,
 	memcpy(device_info, info, sizeof(dev_priv->info));
 	device_info->device_id = dev->pdev->device;
 
+	BUG_ON(device_info->gen > sizeof(device_info->gen_mask) * 8);
+	device_info->gen_mask = 1 << device_info->gen;
+
 	spin_lock_init(&dev_priv->irq_lock);
 	spin_lock_init(&dev_priv->gpu_error.lock);
 	mutex_init(&dev_priv->backlight_lock);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d5496aba1cd5..c6351016eaf0 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -760,6 +760,7 @@ struct intel_device_info {
 	u8 num_pipes:3;
 	u8 num_sprites[I915_MAX_PIPES];
 	u8 gen;
+	u16 gen_mask;
 	u8 ring_mask; /* Rings supported by the HW */
 	DEV_INFO_FOR_EACH_FLAG(DEFINE_FLAG, SEP_SEMICOLON);
 	/* Register offsets for the various display pipes and transcoders */
@@ -2620,14 +2621,14 @@ struct drm_i915_cmd_table {
  * have their own (e.g. HAS_PCH_SPLIT for ILK+ display, IS_foo for particular
  * chips, etc.).
  */
-#define IS_GEN2(dev)	(INTEL_INFO(dev)->gen == 2)
-#define IS_GEN3(dev)	(INTEL_INFO(dev)->gen == 3)
-#define IS_GEN4(dev)	(INTEL_INFO(dev)->gen == 4)
-#define IS_GEN5(dev)	(INTEL_INFO(dev)->gen == 5)
-#define IS_GEN6(dev)	(INTEL_INFO(dev)->gen == 6)
-#define IS_GEN7(dev)	(INTEL_INFO(dev)->gen == 7)
-#define IS_GEN8(dev)	(INTEL_INFO(dev)->gen == 8)
-#define IS_GEN9(dev)	(INTEL_INFO(dev)->gen == 9)
+#define IS_GEN2(dev)	(INTEL_INFO(dev)->gen_mask & BIT(2))
+#define IS_GEN3(dev)	(INTEL_INFO(dev)->gen_mask & BIT(3))
+#define IS_GEN4(dev)	(INTEL_INFO(dev)->gen_mask & BIT(4))
+#define IS_GEN5(dev)	(INTEL_INFO(dev)->gen_mask & BIT(5))
+#define IS_GEN6(dev)	(INTEL_INFO(dev)->gen_mask & BIT(6))
+#define IS_GEN7(dev)	(INTEL_INFO(dev)->gen_mask & BIT(7))
+#define IS_GEN8(dev)	(INTEL_INFO(dev)->gen_mask & BIT(8))
+#define IS_GEN9(dev)	(INTEL_INFO(dev)->gen_mask & BIT(9))
 
 #define RENDER_RING		(1<<RCS)
 #define BSD_RING		(1<<VCS)
-- 
1.9.1