linux-kernel - Re: [PATCH 02/19] iommu/arm-smmu: Pass io-pgtable config to implementation specific function

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Date:   Mon, 31 Aug 2020 22:36:35 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, iommu@...ts.linux-foundation.org,
        linux-arm-msm@...r.kernel.org,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Will Deacon <will@...nel.org>, freedreno@...ts.freedesktop.org,
        Sibi Sankar <sibis@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Rob Clark <robdclark@...omium.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Krishna Reddy <vdumpa@...dia.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/19] iommu/arm-smmu: Pass io-pgtable config to
 implementation specific function

On Thu 13 Aug 21:40 CDT 2020, Rob Clark wrote:

> From: Jordan Crouse <jcrouse@...eaurora.org>
> 
> Construct the io-pgtable config before calling the implementation specific
> init_context function and pass it so the implementation specific function
> can get a chance to change it before the io-pgtable is created.
> 
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
> Signed-off-by: Rob Clark <robdclark@...omium.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/iommu/arm/arm-smmu/arm-smmu-impl.c |  3 ++-
>  drivers/iommu/arm/arm-smmu/arm-smmu.c      | 11 ++++++-----
>  drivers/iommu/arm/arm-smmu/arm-smmu.h      |  3 ++-
>  3 files changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> index f4ff124a1967..a9861dcd0884 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> @@ -68,7 +68,8 @@ static int cavium_cfg_probe(struct arm_smmu_device *smmu)
>  	return 0;
>  }
>  
> -static int cavium_init_context(struct arm_smmu_domain *smmu_domain)
> +static int cavium_init_context(struct arm_smmu_domain *smmu_domain,
> +		struct io_pgtable_cfg *pgtbl_cfg)
>  {
>  	struct cavium_smmu *cs = container_of(smmu_domain->smmu,
>  					      struct cavium_smmu, smmu);
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> index 09c42af9f31e..37d8d49299b4 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> @@ -795,11 +795,6 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
>  		cfg->asid = cfg->cbndx;
>  
>  	smmu_domain->smmu = smmu;
> -	if (smmu->impl && smmu->impl->init_context) {
> -		ret = smmu->impl->init_context(smmu_domain);
> -		if (ret)
> -			goto out_unlock;
> -	}
>  
>  	pgtbl_cfg = (struct io_pgtable_cfg) {
>  		.pgsize_bitmap	= smmu->pgsize_bitmap,
> @@ -810,6 +805,12 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
>  		.iommu_dev	= smmu->dev,
>  	};
>  
> +	if (smmu->impl && smmu->impl->init_context) {
> +		ret = smmu->impl->init_context(smmu_domain, &pgtbl_cfg);
> +		if (ret)
> +			goto out_clear_smmu;
> +	}
> +
>  	if (smmu_domain->non_strict)
>  		pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
>  
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
> index d890a4a968e8..83294516ac08 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
> @@ -386,7 +386,8 @@ struct arm_smmu_impl {
>  			    u64 val);
>  	int (*cfg_probe)(struct arm_smmu_device *smmu);
>  	int (*reset)(struct arm_smmu_device *smmu);
> -	int (*init_context)(struct arm_smmu_domain *smmu_domain);
> +	int (*init_context)(struct arm_smmu_domain *smmu_domain,
> +			struct io_pgtable_cfg *cfg);
>  	void (*tlb_sync)(struct arm_smmu_device *smmu, int page, int sync,
>  			 int status);
>  	int (*def_domain_type)(struct device *dev);
> -- 
> 2.26.2
>