Re: [PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed

From	Sunil Kovvuri <sunil.kovvuri@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed
Date	2017-04-20 06:30 +0200
Message-ID	<tybTb-4h1-3@gated-at.bofh.it> (permalink)
References	<txdu2-c8-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, Apr 17, 2017 at 5:27 PM,  <sunil.kovvuri@gmail.com> wrote:
> From: Sunil Goutham <sgoutham@cavium.com>
>
> For software initiated address translation, when domain type is
> IOMMU_DOMAIN_IDENTITY i.e SMMU is bypassed, mimic HW behavior
> i.e return the same IOVA as translated address.
>
> This patch is an extension to Will Deacon's patchset
> "Implement SMMU passthrough using the default domain".
>
> Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
> ---
>  drivers/iommu/arm-smmu.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 41afb07..2f4a130 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1405,6 +1405,9 @@ static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain,
>         struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
>         struct io_pgtable_ops *ops= smmu_domain->pgtbl_ops;
>
> +       if (domain->type == IOMMU_DOMAIN_IDENTITY)
> +               return iova;
> +
>         if (!ops)
>                 return 0;
>
> --
> 2.7.4
>

Any comments or is this patch accepted ?

Thanks,
Sunil.

Thread

[PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed sunil.kovvuri@gmail.com - 2017-04-17 14:00 +0200
  Re: [PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed Sunil Kovvuri <sunil.kovvuri@gmail.com> - 2017-04-20 06:30 +0200
  Re: [PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is  bypassed Will Deacon <will.deacon@arm.com> - 2017-04-24 16:50 +0200
    Re: [PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed Sunil Kovvuri <sunil.kovvuri@gmail.com> - 2017-04-24 18:00 +0200
      Re: [PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is  bypassed Will Deacon <will.deacon@arm.com> - 2017-04-24 18:10 +0200
        Re: [PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed Sunil Kovvuri <sunil.kovvuri@gmail.com> - 2017-04-24 18:30 +0200

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