linux-kernel - Re: [PATCHv6 3/3] iommu: arm-smmu-impl: Add sdm845 implementation hook

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Date:   Wed, 18 Sep 2019 17:57:55 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andy Gross <agross@...nel.org>, Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Will Deacon <will@...nel.org>, bjorn.andersson@...aro.org,
        iommu@...ts.linux-foundation.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Subject: Re: [PATCHv6 3/3] iommu: arm-smmu-impl: Add sdm845 implementation hook

Quoting Sai Prakash Ranjan (2019-09-17 02:45:04)
> diff --git a/drivers/iommu/arm-smmu-impl.c b/drivers/iommu/arm-smmu-impl.c
> index 3f88cd078dd5..d62da270f430 100644
> --- a/drivers/iommu/arm-smmu-impl.c
> +++ b/drivers/iommu/arm-smmu-impl.c
> @@ -9,7 +9,6 @@
>  
>  #include "arm-smmu.h"
>  
> -
>  static int arm_smmu_gr0_ns(int offset)
>  {
>         switch(offset) {

Why is this hunk still around?

> diff --git a/drivers/iommu/arm-smmu-qcom.c b/drivers/iommu/arm-smmu-qcom.c
> new file mode 100644
> index 000000000000..24c071c1d8b0
> --- /dev/null
> +++ b/drivers/iommu/arm-smmu-qcom.c
> @@ -0,0 +1,51 @@
[...]
> +struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu)
> +{
> +       struct qcom_smmu *qsmmu;
> +
> +       qsmmu = devm_kzalloc(smmu->dev, sizeof(*qsmmu), GFP_KERNEL);
> +       if (!qsmmu)
> +               return ERR_PTR(-ENOMEM);
> +
> +       qsmmu->smmu = *smmu;
> +
> +       qsmmu->smmu.impl = &qcom_smmu_impl;
> +       devm_kfree(smmu->dev, smmu);

This copy is interesting but OK I guess cavium does it.

> +
> +       return &qsmmu->smmu;
> +}