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radeon: Deinline indirect register accessor functions

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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>
This commit is contained in:
Denys Vlasenko
2015-05-20 13:02:37 +02:00
committed by Alex Deucher
parent b0b9bb4dd5
commit 9e5acbc213
7 changed files with 241 additions and 197 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/gpu/drm/radeon/r300.c
View File

@@ -49,6 +49,31 @@
* tell. (Jerome Glisse)
*/
/*
* Indirect registers accessor
*/
uint32_t rv370_pcie_rreg(struct radeon_device *rdev, uint32_t reg)
{
unsigned long flags;
uint32_t r;
spin_lock_irqsave(&rdev->pcie_idx_lock, flags);
WREG32(RADEON_PCIE_INDEX, ((reg) & rdev->pcie_reg_mask));
r = RREG32(RADEON_PCIE_DATA);
spin_unlock_irqrestore(&rdev->pcie_idx_lock, flags);
return r;
}
void rv370_pcie_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v)
{
unsigned long flags;
spin_lock_irqsave(&rdev->pcie_idx_lock, flags);
WREG32(RADEON_PCIE_INDEX, ((reg) & rdev->pcie_reg_mask));
WREG32(RADEON_PCIE_DATA, (v));
spin_unlock_irqrestore(&rdev->pcie_idx_lock, flags);
}
/*
* rv370,rv380 PCIE GART
*/