drm/radeon: Inline r100_mm_rreg, -wreg, v3

This was originally un-inlined by Andi Kleen in 2011 citing size concerns.
Indeed, a first attempt at inlining it grew radeon.ko by 7%.

However, 2% of cpu is spent in this function. Simply inlining it gave 1% more fps
in Urban Terror.

v2: We know the minimum MMIO size. Adding it to the if allows the compiler to
optimize the branch out, improving both performance and size.

The v2 patch decreases radeon.ko size by 2%. I didn't re-benchmark, but common sense
says perf is now more than 1% better.

v3: Also change _wreg, make the threshold a define.

Inlining _wreg increased the size a bit compared to v2, so now radeon.ko
is only 1% smaller.

Signed-off-by: Lauri Kasanen <cand@gmx.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 36 insertions, 37 deletions

diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index ebdce08cfefc..557fcdc32710 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -4065,39 +4065,6 @@ int r100_init(struct radeon_device *rdev)
         return 0;
 }
 
-uint32_t r100_mm_rreg(struct radeon_device *rdev, uint32_t reg,
-                      bool always_indirect)
-{
-        if (reg < rdev->rmmio_size && !always_indirect)
-                return readl(((void __iomem *)rdev->rmmio) + reg);
-        else {
-                unsigned long flags;
-                uint32_t ret;
-
-                spin_lock_irqsave(&rdev->mmio_idx_lock, flags);
-                writel(reg, ((void __iomem *)rdev->rmmio) + RADEON_MM_INDEX);
-                ret = readl(((void __iomem *)rdev->rmmio) + RADEON_MM_DATA);
-                spin_unlock_irqrestore(&rdev->mmio_idx_lock, flags);
-
-                return ret;
-        }
-}
-
-void r100_mm_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v,
-                  bool always_indirect)
-{
-        if (reg < rdev->rmmio_size && !always_indirect)
-                writel(v, ((void __iomem *)rdev->rmmio) + reg);
-        else {
-                unsigned long flags;
-
-                spin_lock_irqsave(&rdev->mmio_idx_lock, flags);
-                writel(reg, ((void __iomem *)rdev->rmmio) + RADEON_MM_INDEX);
-                writel(v, ((void __iomem *)rdev->rmmio) + RADEON_MM_DATA);
-                spin_unlock_irqrestore(&rdev->mmio_idx_lock, flags);
-        }
-}
-
 u32 r100_io_rreg(struct radeon_device *rdev, u32 reg)
 {
         if (reg < rdev->rio_mem_size)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 7561b1332152..6aadfe43bad0 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -2357,10 +2357,42 @@ int radeon_device_init(struct radeon_device *rdev,
 void radeon_device_fini(struct radeon_device *rdev);
 int radeon_gpu_wait_for_idle(struct radeon_device *rdev);
 
-uint32_t r100_mm_rreg(struct radeon_device *rdev, uint32_t reg,
-                      bool always_indirect);
-void r100_mm_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v,
-                  bool always_indirect);
+#define RADEON_MIN_MMIO_SIZE 0x10000
+
+static inline uint32_t r100_mm_rreg(struct radeon_device *rdev, uint32_t reg,
+                                    bool always_indirect)
+{
+        /* The mmio size is 64kb at minimum. Allows the if to be optimized out. */
+        if ((reg < rdev->rmmio_size || reg < RADEON_MIN_MMIO_SIZE) && !always_indirect)
+                return readl(((void __iomem *)rdev->rmmio) + reg);
+        else {
+                unsigned long flags;
+                uint32_t ret;
+
+                spin_lock_irqsave(&rdev->mmio_idx_lock, flags);
+                writel(reg, ((void __iomem *)rdev->rmmio) + RADEON_MM_INDEX);
+                ret = readl(((void __iomem *)rdev->rmmio) + RADEON_MM_DATA);
+                spin_unlock_irqrestore(&rdev->mmio_idx_lock, flags);
+
+                return ret;
+        }
+}
+
+static inline void r100_mm_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v,
+                                bool always_indirect)
+{
+        if ((reg < rdev->rmmio_size || reg < RADEON_MIN_MMIO_SIZE) && !always_indirect)
+                writel(v, ((void __iomem *)rdev->rmmio) + reg);
+        else {
+                unsigned long flags;
+
+                spin_lock_irqsave(&rdev->mmio_idx_lock, flags);
+                writel(reg, ((void __iomem *)rdev->rmmio) + RADEON_MM_INDEX);
+                writel(v, ((void __iomem *)rdev->rmmio) + RADEON_MM_DATA);
+                spin_unlock_irqrestore(&rdev->mmio_idx_lock, flags);
+        }
+}
+
 u32 r100_io_rreg(struct radeon_device *rdev, u32 reg);
 void r100_io_wreg(struct radeon_device *rdev, u32 reg, u32 v);