RE: [PATCH 3/3] drm/amdgpu: support indirect access reg outside of mmio bar (v2)

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> +	} else

RE - This should use "} else {". Apart from that looks good to me.

Hi Chris,

Since there is only one line under "else", I dropped the "{}". I thought that is okay in current kernel coding style and checkpatch.pl also shows no complain.

So you mean you want the code to be the following?

} else {
                ret = adev->pcie_rreg(adev, reg * 4);
}

I can make the change anyway. Does that mean I can get your RB with coding style change for the series?

Regards,
Hawking


-----Original Message-----
From: Christian König <ckoenig.leichtzumerken@xxxxxxxxx> 
Sent: Friday, September 18, 2020 19:27
To: Zhang, Hawking <Hawking.Zhang@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx; Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Wang, Kevin(Yang) <Kevin1.Wang@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>; Chen, Guchun <Guchun.Chen@xxxxxxx>
Subject: Re: [PATCH 3/3] drm/amdgpu: support indirect access reg outside of mmio bar (v2)

Am 18.09.20 um 11:51 schrieb Hawking Zhang:
> support both direct and indirect accessor in unified helper functions.
>
> v2: Retire indirect mmio access via mm_index/data
>
> Signed-off-by: Hawking Zhang <Hawking.Zhang@xxxxxxx>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu.h         | 23 +++----
>   drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c |  2 +-
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c  | 96 +++++++++++------------------
>   drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h   |  4 +-
>   4 files changed, 51 insertions(+), 74 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 40ee44b..50341f0 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1019,12 +1019,13 @@ int amdgpu_gpu_wait_for_idle(struct 
> amdgpu_device *adev);
>   
>   void amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos,
>   			       uint32_t *buf, size_t size, bool write); -uint32_t 
> amdgpu_mm_rreg(struct amdgpu_device *adev, uint32_t reg,
> +uint32_t amdgpu_device_rreg(struct amdgpu_device *adev,
> +			    uint32_t reg, uint32_t acc_flags); void 
> +amdgpu_device_wreg(struct amdgpu_device *adev,
> +			uint32_t reg, uint32_t v,
>   			uint32_t acc_flags);
> -void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
> -		    uint32_t acc_flags);
> -void amdgpu_mm_wreg_mmio_rlc(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
> -		    uint32_t acc_flags);
> +void amdgpu_mm_wreg_mmio_rlc(struct amdgpu_device *adev,
> +			     uint32_t reg, uint32_t v);
>   void amdgpu_mm_wreg8(struct amdgpu_device *adev, uint32_t offset, uint8_t value);
>   uint8_t amdgpu_mm_rreg8(struct amdgpu_device *adev, uint32_t 
> offset);
>   
> @@ -1054,8 +1055,8 @@ int emu_soc_asic_init(struct amdgpu_device *adev);
>    */
>   #define AMDGPU_REGS_NO_KIQ    (1<<1)
>   
> -#define RREG32_NO_KIQ(reg) amdgpu_mm_rreg(adev, (reg), 
> AMDGPU_REGS_NO_KIQ) -#define WREG32_NO_KIQ(reg, v) 
> amdgpu_mm_wreg(adev, (reg), (v), AMDGPU_REGS_NO_KIQ)
> +#define RREG32_NO_KIQ(reg) amdgpu_device_rreg(adev, (reg), 
> +AMDGPU_REGS_NO_KIQ) #define WREG32_NO_KIQ(reg, v) 
> +amdgpu_device_wreg(adev, (reg), (v), AMDGPU_REGS_NO_KIQ)
>   
>   #define RREG32_KIQ(reg) amdgpu_kiq_rreg(adev, (reg))
>   #define WREG32_KIQ(reg, v) amdgpu_kiq_wreg(adev, (reg), (v)) @@ 
> -1063,9 +1064,9 @@ int emu_soc_asic_init(struct amdgpu_device *adev);
>   #define RREG8(reg) amdgpu_mm_rreg8(adev, (reg))
>   #define WREG8(reg, v) amdgpu_mm_wreg8(adev, (reg), (v))
>   
> -#define RREG32(reg) amdgpu_mm_rreg(adev, (reg), 0) -#define 
> DREG32(reg) printk(KERN_INFO "REGISTER: " #reg " : 0x%08X\n", 
> amdgpu_mm_rreg(adev, (reg), 0)) -#define WREG32(reg, v) 
> amdgpu_mm_wreg(adev, (reg), (v), 0)
> +#define RREG32(reg) amdgpu_device_rreg(adev, (reg), 0) #define 
> +DREG32(reg) printk(KERN_INFO "REGISTER: " #reg " : 0x%08X\n", 
> +amdgpu_device_rreg(adev, (reg), 0)) #define WREG32(reg, v) 
> +amdgpu_device_wreg(adev, (reg), (v), 0)
>   #define REG_SET(FIELD, v) (((v) << FIELD##_SHIFT) & FIELD##_MASK)
>   #define REG_GET(FIELD, v) (((v) << FIELD##_SHIFT) & FIELD##_MASK)
>   #define RREG32_PCIE(reg) adev->pcie_rreg(adev, (reg)) @@ -1111,7 
> +1112,7 @@ int emu_soc_asic_init(struct amdgpu_device *adev);
>   		WREG32_SMC(_Reg, tmp);                          \
>   	} while (0)
>   
> -#define DREG32_SYS(sqf, adev, reg) seq_printf((sqf), #reg " : 
> 0x%08X\n", amdgpu_mm_rreg((adev), (reg), false))
> +#define DREG32_SYS(sqf, adev, reg) seq_printf((sqf), #reg " : 
> +0x%08X\n", amdgpu_device_rreg((adev), (reg), false))
>   #define RREG32_IO(reg) amdgpu_io_rreg(adev, (reg))
>   #define WREG32_IO(reg, v) amdgpu_io_wreg(adev, (reg), (v))
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> index abe0c27..2d125b8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> @@ -267,7 +267,7 @@ static int  amdgpu_debugfs_process_reg_op(bool read, struct file *f,
>   		} else {
>   			r = get_user(value, (uint32_t *)buf);
>   			if (!r)
> -				amdgpu_mm_wreg_mmio_rlc(adev, *pos >> 2, value, 0);
> +				amdgpu_mm_wreg_mmio_rlc(adev, *pos >> 2, value);
>   		}
>   		if (r) {
>   			result = r;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 77785b2..beef764 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -303,10 +303,10 @@ void amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos,
>   }
>   
>   /*
> - * MMIO register access helper functions.
> + * register access helper functions.
>    */
>   /**
> - * amdgpu_mm_rreg - read a memory mapped IO register
> + * amdgpu_device_rreg - read a memory mapped IO or indirect register
>    *
>    * @adev: amdgpu_device pointer
>    * @reg: dword aligned register offset @@ -314,33 +314,27 @@ void 
> amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos,
>    *
>    * Returns the 32 bit value from the offset specified.
>    */
> -uint32_t amdgpu_mm_rreg(struct amdgpu_device *adev, uint32_t reg,
> -			uint32_t acc_flags)
> +uint32_t amdgpu_device_rreg(struct amdgpu_device *adev,
> +			    uint32_t reg, uint32_t acc_flags)
>   {
>   	uint32_t ret;
>   
>   	if (adev->in_pci_err_recovery)
>   		return 0;
>   
> -	if (!(acc_flags & AMDGPU_REGS_NO_KIQ) && amdgpu_sriov_runtime(adev) &&
> -	    down_read_trylock(&adev->reset_sem)) {
> -		ret = amdgpu_kiq_rreg(adev, reg);
> -		up_read(&adev->reset_sem);
> -		return ret;
> -	}
> -
> -	if ((reg * 4) < adev->rmmio_size)
> -		ret = readl(((void __iomem *)adev->rmmio) + (reg * 4));
> -	else {
> -		unsigned long flags;
> +	if ((reg * 4) < adev->rmmio_size) {
> +		if (!(acc_flags & AMDGPU_REGS_NO_KIQ) &&
> +		    amdgpu_sriov_runtime(adev) &&
> +		    down_read_trylock(&adev->reset_sem)) {
> +			ret = amdgpu_kiq_rreg(adev, reg);
> +			up_read(&adev->reset_sem);
> +		} else
> +			ret = readl(((void __iomem *)adev->rmmio) + (reg * 4));
> +	} else

This should use "} else {". Apart from that looks good to me.

Christian.

> +		ret = adev->pcie_rreg(adev, reg * 4);
>   
> -		spin_lock_irqsave(&adev->mmio_idx_lock, flags);
> -		writel((reg * 4), ((void __iomem *)adev->rmmio) + (mmMM_INDEX * 4));
> -		ret = readl(((void __iomem *)adev->rmmio) + (mmMM_DATA * 4));
> -		spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
> -	}
> +	trace_amdgpu_device_rreg(adev->pdev->device, reg, ret);
>   
> -	trace_amdgpu_mm_rreg(adev->pdev->device, reg, ret);
>   	return ret;
>   }
>   
> @@ -394,29 +388,8 @@ void amdgpu_mm_wreg8(struct amdgpu_device *adev, uint32_t offset, uint8_t value)
>   		BUG();
>   }
>   
> -static inline void amdgpu_mm_wreg_mmio(struct amdgpu_device *adev,
> -				       uint32_t reg, uint32_t v,
> -				       uint32_t acc_flags)
> -{
> -	if (adev->in_pci_err_recovery)
> -		return;
> -
> -	trace_amdgpu_mm_wreg(adev->pdev->device, reg, v);
> -
> -	if ((reg * 4) < adev->rmmio_size)
> -		writel(v, ((void __iomem *)adev->rmmio) + (reg * 4));
> -	else {
> -		unsigned long flags;
> -
> -		spin_lock_irqsave(&adev->mmio_idx_lock, flags);
> -		writel((reg * 4), ((void __iomem *)adev->rmmio) + (mmMM_INDEX * 4));
> -		writel(v, ((void __iomem *)adev->rmmio) + (mmMM_DATA * 4));
> -		spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
> -	}
> -}
> -
>   /**
> - * amdgpu_mm_wreg - write to a memory mapped IO register
> + * amdgpu_device_wreg - write to a memory mapped IO or indirect 
> + register
>    *
>    * @adev: amdgpu_device pointer
>    * @reg: dword aligned register offset @@ -425,20 +398,25 @@ static 
> inline void amdgpu_mm_wreg_mmio(struct amdgpu_device *adev,
>    *
>    * Writes the value specified to the offset specified.
>    */
> -void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
> -		    uint32_t acc_flags)
> +void amdgpu_device_wreg(struct amdgpu_device *adev,
> +			uint32_t reg, uint32_t v,
> +			uint32_t acc_flags)
>   {
>   	if (adev->in_pci_err_recovery)
>   		return;
>   
> -	if (!(acc_flags & AMDGPU_REGS_NO_KIQ) && amdgpu_sriov_runtime(adev) &&
> -	    down_read_trylock(&adev->reset_sem)) {
> -		amdgpu_kiq_wreg(adev, reg, v);
> -		up_read(&adev->reset_sem);
> -		return;
> -	}
> +	if ((reg * 4) < adev->rmmio_size) {
> +		if (!(acc_flags & AMDGPU_REGS_NO_KIQ) &&
> +		    amdgpu_sriov_runtime(adev) &&
> +		    down_read_trylock(&adev->reset_sem)) {
> +			amdgpu_kiq_wreg(adev, reg, v);
> +			up_read(&adev->reset_sem);
> +		} else
> +			writel(v, ((void __iomem *)adev->rmmio) + (reg * 4));
> +	} else
> +		adev->pcie_wreg(adev, reg * 4, v);
>   
> -	amdgpu_mm_wreg_mmio(adev, reg, v, acc_flags);
> +	trace_amdgpu_device_wreg(adev->pdev->device, reg, v);
>   }
>   
>   /*
> @@ -446,21 +424,19 @@ void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
>    *
>    * this function is invoked only the debugfs register access
>    * */
> -void amdgpu_mm_wreg_mmio_rlc(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
> -		    uint32_t acc_flags)
> +void amdgpu_mm_wreg_mmio_rlc(struct amdgpu_device *adev,
> +			     uint32_t reg, uint32_t v)
>   {
>   	if (adev->in_pci_err_recovery)
>   		return;
>   
>   	if (amdgpu_sriov_fullaccess(adev) &&
> -		adev->gfx.rlc.funcs &&
> -		adev->gfx.rlc.funcs->is_rlcg_access_range) {
> -
> +	    adev->gfx.rlc.funcs &&
> +	    adev->gfx.rlc.funcs->is_rlcg_access_range) {
>   		if (adev->gfx.rlc.funcs->is_rlcg_access_range(adev, reg))
>   			return adev->gfx.rlc.funcs->rlcg_wreg(adev, reg, v);
> -	}
> -
> -	amdgpu_mm_wreg_mmio(adev, reg, v, acc_flags);
> +	} else
> +		writel(v, ((void __iomem *)adev->rmmio) + (reg * 4));
>   }
>   
>   /**
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
> index 63e734a..5da20fc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
> @@ -35,7 +35,7 @@
>   #define AMDGPU_JOB_GET_TIMELINE_NAME(job) \
>   	 
> job->base.s_fence->finished.ops->get_timeline_name(&job->base.s_fence-
> >finished)
>   
> -TRACE_EVENT(amdgpu_mm_rreg,
> +TRACE_EVENT(amdgpu_device_rreg,
>   	    TP_PROTO(unsigned did, uint32_t reg, uint32_t value),
>   	    TP_ARGS(did, reg, value),
>   	    TP_STRUCT__entry(
> @@ -54,7 +54,7 @@ TRACE_EVENT(amdgpu_mm_rreg,
>   		      (unsigned long)__entry->value)
>   );
>   
> -TRACE_EVENT(amdgpu_mm_wreg,
> +TRACE_EVENT(amdgpu_device_wreg,
>   	    TP_PROTO(unsigned did, uint32_t reg, uint32_t value),
>   	    TP_ARGS(did, reg, value),
>   	    TP_STRUCT__entry(
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