linux-kernel - Re: [PATCH v2 1/7] iommu/arm-smmu: Pass io_pgtable_cfg to impl specific init

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Date:   Fri, 31 Jan 2020 14:00:43 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Sharat Masetty <smasetty@...eaurora.org>
Cc:     freedreno@...ts.freedesktop.org, dri-devel@...edesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        will@...nel.org, robin.murphy@....com, joro@...tes.org,
        iommu@...ts.linux-foundation.org, jcrouse@...eaurora.org,
        saiprakash.ranjan@...eaurora.org
Subject: Re: [PATCH v2 1/7] iommu/arm-smmu: Pass io_pgtable_cfg to impl
 specific init_context

Hi,

On Thu, Jan 02, 2020 at 04:32:07PM +0530, Sharat Masetty wrote:
> From: Jordan Crouse <jcrouse@...eaurora.org>
> 
> Pass the propposed io_pgtable_cfg to the implementation specific
> init_context() function to give the implementation an opportunity to
> to modify it before it gets passed to io-pgtable.
> 
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> ---
>  drivers/iommu/arm-smmu-impl.c |  3 ++-
>  drivers/iommu/arm-smmu.c      | 11 ++++++-----
>  drivers/iommu/arm-smmu.h      |  3 ++-
>  3 files changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iommu/arm-smmu-impl.c b/drivers/iommu/arm-smmu-impl.c
> index b2fe72a..33ed682 100644
> --- a/drivers/iommu/arm-smmu-impl.c
> +++ b/drivers/iommu/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-smmu.c b/drivers/iommu/arm-smmu.c
> index eee48f9..4f7e0c0 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -758,11 +758,6 @@ 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;
> -	}
> 
>  	smmu_domain->pgtbl_cfg = (struct io_pgtable_cfg) {
>  		.pgsize_bitmap	= smmu->pgsize_bitmap,
> @@ -773,6 +768,12 @@ 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, &smmu_domain->pgtbl_cfg);

Which patch adds 'pgtbl_cfg' to struct arm_smmu_domain? The field does
not exist in iommu/next.