Re: [PATCH v3 4/6] iommu/ipmmu-vmsa: Calculate context registers' offset instead of a macro

["Niklas Söderlund" <niklas.soderlund@ragnatech.se>]

Hi Shimoda-san,

Thanks for your patch,

On 2019-11-06 11:35:48 +0900, Yoshihiro Shimoda wrote:
> Since we will have changed memory mapping of the IPMMU in the future,
> this patch uses ipmmu_features values instead of a macro to
> calculate context registers offset. No behavior change.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

> ---
>  drivers/iommu/ipmmu-vmsa.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> index c4fcfda..8e2ca1c 100644
> --- a/drivers/iommu/ipmmu-vmsa.c
> +++ b/drivers/iommu/ipmmu-vmsa.c
> @@ -50,6 +50,8 @@ struct ipmmu_features {
>  	bool twobit_imttbcr_sl0;
>  	bool reserved_context;
>  	bool cache_snoop;
> +	unsigned int ctx_offset_base;
> +	unsigned int ctx_offset_stride;
>  };
>  
>  struct ipmmu_vmsa_device {
> @@ -99,8 +101,6 @@ static struct ipmmu_vmsa_device *to_ipmmu(struct device *dev)
>  
>  #define IM_NS_ALIAS_OFFSET		0x800
>  
> -#define IM_CTX_SIZE			0x40
> -
>  /* MMU "context" registers */
>  #define IMCTR				0x0000		/* R-Car Gen2/3 */
>  #define IMCTR_INTEN			(1 << 2)	/* R-Car Gen2/3 */
> @@ -193,7 +193,8 @@ static void ipmmu_write(struct ipmmu_vmsa_device *mmu, unsigned int offset,
>  static unsigned int ipmmu_ctx_reg(struct ipmmu_vmsa_device *mmu,
>  				  unsigned int context_id, unsigned int reg)
>  {
> -	return context_id * IM_CTX_SIZE + reg;
> +	return mmu->features->ctx_offset_base +
> +	       context_id * mmu->features->ctx_offset_stride + reg;
>  }
>  
>  static u32 ipmmu_ctx_read(struct ipmmu_vmsa_device *mmu,
> @@ -939,6 +940,8 @@ static const struct ipmmu_features ipmmu_features_default = {
>  	.twobit_imttbcr_sl0 = false,
>  	.reserved_context = false,
>  	.cache_snoop = true,
> +	.ctx_offset_base = 0,
> +	.ctx_offset_stride = 0x40,
>  };
>  
>  static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
> @@ -950,6 +953,8 @@ static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
>  	.twobit_imttbcr_sl0 = true,
>  	.reserved_context = true,
>  	.cache_snoop = false,
> +	.ctx_offset_base = 0,
> +	.ctx_offset_stride = 0x40,
>  };
>  
>  static const struct of_device_id ipmmu_of_ids[] = {
> -- 
> 2.7.4
> 

-- 
Regards,
Niklas Söderlund
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