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Date: Mon, 18 May 2015 20:06:22 +0200
From: Christian König <christian.koenig@....com>
To: Denys Vlasenko <dvlasenk@...hat.com>
CC: Alex Deucher <alexander.deucher@....com>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] radeon: Deinline indirect register accessor functions
I'm actually surprised how often people come along with that. The last
time we tried this it caused a noticeable performance drop.
Basic problem is that this line:
> + if ((reg < rdev->rmmio_size || reg < RADEON_MIN_MMIO_SIZE) && !always_indirect)
optimizes away in most of the cases which reduces the call to a readl
which is way faster than the spinlock path.
So this is a NAK,
Christian.
On 18.05.2015 19:59, Denys Vlasenko wrote:
> This patch deinlines indirect register accessor functions.
>
> These functions perform two mmio accesses, framed by spinlock/unlock.
> Spin lock/unlock by itself takes more than 50 cycles in ideal case.
>
> 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
> r100_mm_rreg: 112 bytes, 2083 callsites
> r100_mm_wreg: 116 bytes, 3570 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
>
> Reduction in code size is more than 80,000 bytes:
>
> text data bss dec hex filename
> 85740176 22294680 20627456 128662312 7ab3b28 vmlinux.before
> 85657104 22294872 20627456 128579432 7a9f768 vmlinux
>
> Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
> Cc: Christian König <christian.koenig@....com>
> Cc: Alex Deucher <alexander.deucher@....com>
> Cc: linux-kernel@...r.kernel.org
> ---
> drivers/gpu/drm/radeon/r100.c | 34 +++++
> drivers/gpu/drm/radeon/radeon.h | 229 +++------------------------------
> drivers/gpu/drm/radeon/radeon_device.c | 179 ++++++++++++++++++++++++++
> 3 files changed, 233 insertions(+), 209 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
> index 04f2514..95868c7 100644
> --- a/drivers/gpu/drm/radeon/r100.c
> +++ b/drivers/gpu/drm/radeon/r100.c
> @@ -4090,6 +4090,40 @@ int r100_init(struct radeon_device *rdev)
> return 0;
> }
>
> +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;
> + }
> +}
> +
> +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)
> {
> if (reg < rdev->rio_mem_size)
> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
> index 5587603..bb6b25c 100644
> --- a/drivers/gpu/drm/radeon/radeon.h
> +++ b/drivers/gpu/drm/radeon/radeon.h
> @@ -2465,39 +2465,10 @@ int radeon_gpu_wait_for_idle(struct radeon_device *rdev);
>
> #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);
> - }
> -}
> +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);
>
> u32 r100_io_rreg(struct radeon_device *rdev, u32 reg);
> void r100_io_wreg(struct radeon_device *rdev, u32 reg, u32 v);
> @@ -2582,182 +2553,22 @@ static inline struct radeon_fence *to_radeon_fence(struct fence *f)
> /*
> * Indirect registers accessor
> */
> -static inline 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;
> -}
> -
> -static inline 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);
> -}
> -
> -static inline u32 tn_smc_rreg(struct radeon_device *rdev, u32 reg)
> -{
> - unsigned long flags;
> - u32 r;
> -
> - spin_lock_irqsave(&rdev->smc_idx_lock, flags);
> - WREG32(TN_SMC_IND_INDEX_0, (reg));
> - r = RREG32(TN_SMC_IND_DATA_0);
> - spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);
> - return r;
> -}
> -
> -static inline void tn_smc_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&rdev->smc_idx_lock, flags);
> - WREG32(TN_SMC_IND_INDEX_0, (reg));
> - WREG32(TN_SMC_IND_DATA_0, (v));
> - spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);
> -}
> -
> -static inline u32 r600_rcu_rreg(struct radeon_device *rdev, u32 reg)
> -{
> - unsigned long flags;
> - u32 r;
> -
> - spin_lock_irqsave(&rdev->rcu_idx_lock, flags);
> - WREG32(R600_RCU_INDEX, ((reg) & 0x1fff));
> - r = RREG32(R600_RCU_DATA);
> - spin_unlock_irqrestore(&rdev->rcu_idx_lock, flags);
> - return r;
> -}
> -
> -static inline void r600_rcu_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&rdev->rcu_idx_lock, flags);
> - WREG32(R600_RCU_INDEX, ((reg) & 0x1fff));
> - WREG32(R600_RCU_DATA, (v));
> - spin_unlock_irqrestore(&rdev->rcu_idx_lock, flags);
> -}
> -
> -static inline u32 eg_cg_rreg(struct radeon_device *rdev, u32 reg)
> -{
> - unsigned long flags;
> - u32 r;
> -
> - spin_lock_irqsave(&rdev->cg_idx_lock, flags);
> - WREG32(EVERGREEN_CG_IND_ADDR, ((reg) & 0xffff));
> - r = RREG32(EVERGREEN_CG_IND_DATA);
> - spin_unlock_irqrestore(&rdev->cg_idx_lock, flags);
> - return r;
> -}
> -
> -static inline void eg_cg_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&rdev->cg_idx_lock, flags);
> - WREG32(EVERGREEN_CG_IND_ADDR, ((reg) & 0xffff));
> - WREG32(EVERGREEN_CG_IND_DATA, (v));
> - spin_unlock_irqrestore(&rdev->cg_idx_lock, flags);
> -}
> -
> -static inline u32 eg_pif_phy0_rreg(struct radeon_device *rdev, u32 reg)
> -{
> - unsigned long flags;
> - u32 r;
> -
> - spin_lock_irqsave(&rdev->pif_idx_lock, flags);
> - WREG32(EVERGREEN_PIF_PHY0_INDEX, ((reg) & 0xffff));
> - r = RREG32(EVERGREEN_PIF_PHY0_DATA);
> - spin_unlock_irqrestore(&rdev->pif_idx_lock, flags);
> - return r;
> -}
> -
> -static inline void eg_pif_phy0_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&rdev->pif_idx_lock, flags);
> - WREG32(EVERGREEN_PIF_PHY0_INDEX, ((reg) & 0xffff));
> - WREG32(EVERGREEN_PIF_PHY0_DATA, (v));
> - spin_unlock_irqrestore(&rdev->pif_idx_lock, flags);
> -}
> -
> -static inline u32 eg_pif_phy1_rreg(struct radeon_device *rdev, u32 reg)
> -{
> - unsigned long flags;
> - u32 r;
> -
> - spin_lock_irqsave(&rdev->pif_idx_lock, flags);
> - WREG32(EVERGREEN_PIF_PHY1_INDEX, ((reg) & 0xffff));
> - r = RREG32(EVERGREEN_PIF_PHY1_DATA);
> - spin_unlock_irqrestore(&rdev->pif_idx_lock, flags);
> - return r;
> -}
> -
> -static inline void eg_pif_phy1_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&rdev->pif_idx_lock, flags);
> - WREG32(EVERGREEN_PIF_PHY1_INDEX, ((reg) & 0xffff));
> - WREG32(EVERGREEN_PIF_PHY1_DATA, (v));
> - spin_unlock_irqrestore(&rdev->pif_idx_lock, flags);
> -}
> -
> -static inline u32 r600_uvd_ctx_rreg(struct radeon_device *rdev, u32 reg)
> -{
> - unsigned long flags;
> - u32 r;
> -
> - spin_lock_irqsave(&rdev->uvd_idx_lock, flags);
> - WREG32(R600_UVD_CTX_INDEX, ((reg) & 0x1ff));
> - r = RREG32(R600_UVD_CTX_DATA);
> - spin_unlock_irqrestore(&rdev->uvd_idx_lock, flags);
> - return r;
> -}
> -
> -static inline void r600_uvd_ctx_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&rdev->uvd_idx_lock, flags);
> - WREG32(R600_UVD_CTX_INDEX, ((reg) & 0x1ff));
> - WREG32(R600_UVD_CTX_DATA, (v));
> - spin_unlock_irqrestore(&rdev->uvd_idx_lock, flags);
> -}
> -
> -
> -static inline u32 cik_didt_rreg(struct radeon_device *rdev, u32 reg)
> -{
> - unsigned long flags;
> - u32 r;
> -
> - spin_lock_irqsave(&rdev->didt_idx_lock, flags);
> - WREG32(CIK_DIDT_IND_INDEX, (reg));
> - r = RREG32(CIK_DIDT_IND_DATA);
> - spin_unlock_irqrestore(&rdev->didt_idx_lock, flags);
> - return r;
> -}
> -
> -static inline void cik_didt_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&rdev->didt_idx_lock, flags);
> - WREG32(CIK_DIDT_IND_INDEX, (reg));
> - WREG32(CIK_DIDT_IND_DATA, (v));
> - spin_unlock_irqrestore(&rdev->didt_idx_lock, flags);
> -}
> +uint32_t rv370_pcie_rreg(struct radeon_device *rdev, uint32_t reg);
> +void rv370_pcie_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v);
> +u32 tn_smc_rreg(struct radeon_device *rdev, u32 reg);
> +void tn_smc_wreg(struct radeon_device *rdev, u32 reg, u32 v);
> +u32 r600_rcu_rreg(struct radeon_device *rdev, u32 reg);
> +void r600_rcu_wreg(struct radeon_device *rdev, u32 reg, u32 v);
> +u32 eg_cg_rreg(struct radeon_device *rdev, u32 reg);
> +void eg_cg_wreg(struct radeon_device *rdev, u32 reg, u32 v);
> +u32 eg_pif_phy0_rreg(struct radeon_device *rdev, u32 reg);
> +void eg_pif_phy0_wreg(struct radeon_device *rdev, u32 reg, u32 v);
> +u32 eg_pif_phy1_rreg(struct radeon_device *rdev, u32 reg);
> +void eg_pif_phy1_wreg(struct radeon_device *rdev, u32 reg, u32 v);
> +u32 r600_uvd_ctx_rreg(struct radeon_device *rdev, u32 reg);
> +void r600_uvd_ctx_wreg(struct radeon_device *rdev, u32 reg, u32 v);
> +u32 cik_didt_rreg(struct radeon_device *rdev, u32 reg);
> +void cik_didt_wreg(struct radeon_device *rdev, u32 reg, u32 v);
>
> void r100_pll_errata_after_index(struct radeon_device *rdev);
>
> diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
> index bd7519f..6712505 100644
> --- a/drivers/gpu/drm/radeon/radeon_device.c
> +++ b/drivers/gpu/drm/radeon/radeon_device.c
> @@ -161,6 +161,185 @@ static void radeon_device_handle_px_quirks(struct radeon_device *rdev)
> rdev->flags &= ~RADEON_IS_PX;
> }
>
> +/*
> + * 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);
> +}
> +
> +u32 tn_smc_rreg(struct radeon_device *rdev, u32 reg)
> +{
> + unsigned long flags;
> + u32 r;
> +
> + spin_lock_irqsave(&rdev->smc_idx_lock, flags);
> + WREG32(TN_SMC_IND_INDEX_0, (reg));
> + r = RREG32(TN_SMC_IND_DATA_0);
> + spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);
> + return r;
> +}
> +
> +void tn_smc_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&rdev->smc_idx_lock, flags);
> + WREG32(TN_SMC_IND_INDEX_0, (reg));
> + WREG32(TN_SMC_IND_DATA_0, (v));
> + spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);
> +}
> +
> +u32 r600_rcu_rreg(struct radeon_device *rdev, u32 reg)
> +{
> + unsigned long flags;
> + u32 r;
> +
> + spin_lock_irqsave(&rdev->rcu_idx_lock, flags);
> + WREG32(R600_RCU_INDEX, ((reg) & 0x1fff));
> + r = RREG32(R600_RCU_DATA);
> + spin_unlock_irqrestore(&rdev->rcu_idx_lock, flags);
> + return r;
> +}
> +
> +void r600_rcu_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&rdev->rcu_idx_lock, flags);
> + WREG32(R600_RCU_INDEX, ((reg) & 0x1fff));
> + WREG32(R600_RCU_DATA, (v));
> + spin_unlock_irqrestore(&rdev->rcu_idx_lock, flags);
> +}
> +
> +u32 eg_cg_rreg(struct radeon_device *rdev, u32 reg)
> +{
> + unsigned long flags;
> + u32 r;
> +
> + spin_lock_irqsave(&rdev->cg_idx_lock, flags);
> + WREG32(EVERGREEN_CG_IND_ADDR, ((reg) & 0xffff));
> + r = RREG32(EVERGREEN_CG_IND_DATA);
> + spin_unlock_irqrestore(&rdev->cg_idx_lock, flags);
> + return r;
> +}
> +
> +void eg_cg_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&rdev->cg_idx_lock, flags);
> + WREG32(EVERGREEN_CG_IND_ADDR, ((reg) & 0xffff));
> + WREG32(EVERGREEN_CG_IND_DATA, (v));
> + spin_unlock_irqrestore(&rdev->cg_idx_lock, flags);
> +}
> +
> +u32 eg_pif_phy0_rreg(struct radeon_device *rdev, u32 reg)
> +{
> + unsigned long flags;
> + u32 r;
> +
> + spin_lock_irqsave(&rdev->pif_idx_lock, flags);
> + WREG32(EVERGREEN_PIF_PHY0_INDEX, ((reg) & 0xffff));
> + r = RREG32(EVERGREEN_PIF_PHY0_DATA);
> + spin_unlock_irqrestore(&rdev->pif_idx_lock, flags);
> + return r;
> +}
> +
> +void eg_pif_phy0_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&rdev->pif_idx_lock, flags);
> + WREG32(EVERGREEN_PIF_PHY0_INDEX, ((reg) & 0xffff));
> + WREG32(EVERGREEN_PIF_PHY0_DATA, (v));
> + spin_unlock_irqrestore(&rdev->pif_idx_lock, flags);
> +}
> +
> +u32 eg_pif_phy1_rreg(struct radeon_device *rdev, u32 reg)
> +{
> + unsigned long flags;
> + u32 r;
> +
> + spin_lock_irqsave(&rdev->pif_idx_lock, flags);
> + WREG32(EVERGREEN_PIF_PHY1_INDEX, ((reg) & 0xffff));
> + r = RREG32(EVERGREEN_PIF_PHY1_DATA);
> + spin_unlock_irqrestore(&rdev->pif_idx_lock, flags);
> + return r;
> +}
> +
> +void eg_pif_phy1_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&rdev->pif_idx_lock, flags);
> + WREG32(EVERGREEN_PIF_PHY1_INDEX, ((reg) & 0xffff));
> + WREG32(EVERGREEN_PIF_PHY1_DATA, (v));
> + spin_unlock_irqrestore(&rdev->pif_idx_lock, flags);
> +}
> +
> +u32 r600_uvd_ctx_rreg(struct radeon_device *rdev, u32 reg)
> +{
> + unsigned long flags;
> + u32 r;
> +
> + spin_lock_irqsave(&rdev->uvd_idx_lock, flags);
> + WREG32(R600_UVD_CTX_INDEX, ((reg) & 0x1ff));
> + r = RREG32(R600_UVD_CTX_DATA);
> + spin_unlock_irqrestore(&rdev->uvd_idx_lock, flags);
> + return r;
> +}
> +
> +void r600_uvd_ctx_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&rdev->uvd_idx_lock, flags);
> + WREG32(R600_UVD_CTX_INDEX, ((reg) & 0x1ff));
> + WREG32(R600_UVD_CTX_DATA, (v));
> + spin_unlock_irqrestore(&rdev->uvd_idx_lock, flags);
> +}
> +
> +u32 cik_didt_rreg(struct radeon_device *rdev, u32 reg)
> +{
> + unsigned long flags;
> + u32 r;
> +
> + spin_lock_irqsave(&rdev->didt_idx_lock, flags);
> + WREG32(CIK_DIDT_IND_INDEX, (reg));
> + r = RREG32(CIK_DIDT_IND_DATA);
> + spin_unlock_irqrestore(&rdev->didt_idx_lock, flags);
> + return r;
> +}
> +
> +void cik_didt_wreg(struct radeon_device *rdev, u32 reg, u32 v)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&rdev->didt_idx_lock, flags);
> + WREG32(CIK_DIDT_IND_INDEX, (reg));
> + WREG32(CIK_DIDT_IND_DATA, (v));
> + spin_unlock_irqrestore(&rdev->didt_idx_lock, flags);
> +}
> +
> /**
> * radeon_program_register_sequence - program an array of registers.
> *
--
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