Re: [PATCH v6 24/25] iommu: Convert simple drivers with DOMAIN_DMA to domain_alloc_paging()

[Baolu Lu <baolu.lu@linux.intel.com>]

On 2023/8/3 8:08, Jason Gunthorpe wrote:
> These drivers are all trivially converted since the function is only
> called if the domain type is going to be
> IOMMU_DOMAIN_UNMANAGED/DMA.
> 
> Tested-by: Heiko Stuebner <heiko@sntech.de>
> Tested-by: Steven Price <steven.price@arm.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>   drivers/iommu/arm/arm-smmu/qcom_iommu.c | 6 ++----
>   drivers/iommu/exynos-iommu.c            | 7 ++-----
>   drivers/iommu/ipmmu-vmsa.c              | 7 ++-----
>   drivers/iommu/mtk_iommu.c               | 7 ++-----
>   drivers/iommu/rockchip-iommu.c          | 7 ++-----
>   drivers/iommu/sprd-iommu.c              | 7 ++-----
>   drivers/iommu/sun50i-iommu.c            | 9 +++------
>   drivers/iommu/tegra-smmu.c              | 7 ++-----
>   8 files changed, 17 insertions(+), 40 deletions(-)

[...]

> diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c
> index 0bf08b120cf105..056832a367c2af 100644
> --- a/drivers/iommu/sun50i-iommu.c
> +++ b/drivers/iommu/sun50i-iommu.c
> @@ -667,14 +667,11 @@ static phys_addr_t sun50i_iommu_iova_to_phys(struct iommu_domain *domain,
>   		sun50i_iova_get_page_offset(iova);
>   }
>   
> -static struct iommu_domain *sun50i_iommu_domain_alloc(unsigned type)
> +static struct iommu_domain *
> +sun50i_iommu_domain_alloc_paging(struct device *paging)

Why not "struct device *dev"?

Typo? Or anything I missed?

>   {
>   	struct sun50i_iommu_domain *sun50i_domain;
>   
> -	if (type != IOMMU_DOMAIN_DMA &&
> -	    type != IOMMU_DOMAIN_UNMANAGED)
> -		return NULL;
> -
>   	sun50i_domain = kzalloc(sizeof(*sun50i_domain), GFP_KERNEL);
>   	if (!sun50i_domain)
>   		return NULL;
> @@ -840,7 +837,7 @@ static const struct iommu_ops sun50i_iommu_ops = {
>   	.identity_domain = &sun50i_iommu_identity_domain,
>   	.pgsize_bitmap	= SZ_4K,
>   	.device_group	= sun50i_iommu_device_group,
> -	.domain_alloc	= sun50i_iommu_domain_alloc,
> +	.domain_alloc_paging = sun50i_iommu_domain_alloc_paging,
>   	.of_xlate	= sun50i_iommu_of_xlate,
>   	.probe_device	= sun50i_iommu_probe_device,
>   	.default_domain_ops = &(const struct iommu_domain_ops) {
> diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
> index 6cba034905edbf..69c40c191ce4f0 100644
> --- a/drivers/iommu/tegra-smmu.c
> +++ b/drivers/iommu/tegra-smmu.c
> @@ -272,13 +272,10 @@ static void tegra_smmu_free_asid(struct tegra_smmu *smmu, unsigned int id)
>   	clear_bit(id, smmu->asids);
>   }
>   
> -static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
> +static struct iommu_domain *tegra_smmu_domain_alloc_paging(struct device *dev)
>   {
>   	struct tegra_smmu_as *as;
>   
> -	if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
> -		return NULL;
> -
>   	as = kzalloc(sizeof(*as), GFP_KERNEL);
>   	if (!as)
>   		return NULL;
> @@ -997,7 +994,7 @@ static const struct iommu_ops tegra_smmu_ops = {
>   	.default_domain = &tegra_smmu_identity_domain,
>   	.identity_domain = &tegra_smmu_identity_domain,
>   	.def_domain_type = &tegra_smmu_def_domain_type,
> -	.domain_alloc = tegra_smmu_domain_alloc,
> +	.domain_alloc_paging = tegra_smmu_domain_alloc_paging,
>   	.probe_device = tegra_smmu_probe_device,
>   	.device_group = tegra_smmu_device_group,
>   	.of_xlate = tegra_smmu_of_xlate,

Anyway,

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>

Best regards,
baolu