diff options
| author | Denys Vlasenko <dvlasenk@redhat.com> | 2015-05-20 14:02:37 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2015-05-28 21:52:40 +0300 |
| commit | 9e5acbc21380ca8bd470ec23c139dd4e245a221d (patch) | |
| tree | f78d95a60605b5b4f94c40fe62f6cd6fa59f7ab7 /drivers/gpu/drm/radeon/r100.c | |
| parent | b0b9bb4dd51f396dcf843831905f729e74b0c8c0 (diff) | |
| download | linux-9e5acbc21380ca8bd470ec23c139dd4e245a221d.tar.xz | |
radeon: Deinline indirect register accessor functions
This patch deinlines indirect register accessor functions.
These functions perform two mmio accesses, framed by spin lock/unlock.
Spin lock/unlock by itself takes more than 50 cycles in ideal case
(if lock is exclusively cached on current CPU).
With this .config: http://busybox.net/~vda/kernel_config,
after uninlining these functions have sizes and callsite counts
as follows:
r600_uvd_ctx_rreg: 111 bytes, 4 callsites
r600_uvd_ctx_wreg: 113 bytes, 5 callsites
eg_pif_phy0_rreg: 106 bytes, 13 callsites
eg_pif_phy0_wreg: 108 bytes, 13 callsites
eg_pif_phy1_rreg: 107 bytes, 13 callsites
eg_pif_phy1_wreg: 108 bytes, 13 callsites
rv370_pcie_rreg: 111 bytes, 21 callsites
rv370_pcie_wreg: 113 bytes, 24 callsites
r600_rcu_rreg: 111 bytes, 16 callsites
r600_rcu_wreg: 113 bytes, 25 callsites
cik_didt_rreg: 106 bytes, 10 callsites
cik_didt_wreg: 107 bytes, 10 callsites
tn_smc_rreg: 106 bytes, 126 callsites
tn_smc_wreg: 107 bytes, 116 callsites
eg_cg_rreg: 107 bytes, 20 callsites
eg_cg_wreg: 108 bytes, 52 callsites
Functions r100_mm_rreg() and r100_mm_rreg() have a fast path and
a locked (slow) path. This patch deinlines only slow path.
r100_mm_rreg_slow: 78 bytes, 2083 callsites
r100_mm_wreg_slow: 81 bytes, 3570 callsites
Reduction in code size is more than 65,000 bytes:
text data bss dec hex filename
85740176 22294680 20627456 128662312 7ab3b28 vmlinux.before
85674192 22294776 20627456 128598664 7aa4288 vmlinux
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/r100.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/r100.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c index 04f2514f7564..238b13f045c1 100644 --- a/drivers/gpu/drm/radeon/r100.c +++ b/drivers/gpu/drm/radeon/r100.c @@ -4090,6 +4090,28 @@ int r100_init(struct radeon_device *rdev) return 0; } +uint32_t r100_mm_rreg_slow(struct radeon_device *rdev, uint32_t reg) +{ + 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_slow(struct radeon_device *rdev, uint32_t reg, uint32_t v) +{ + 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) |