linux-kernel - Re: [PATCH v16 2/5] iommu/arm-smmu: refactor qcom

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Message-ID: <CAF6AEGt6xNe5VpHq=fiz03M1_m+psn8ouX_uuRgRV6=kthfF+w@mail.gmail.com>
Date: Mon, 28 Oct 2024 14:13:12 -0700
From: Rob Clark <robdclark@...il.com>
To: Bibek Kumar Patro <quic_bibekkum@...cinc.com>
Cc: will@...nel.org, robin.murphy@....com, joro@...tes.org, jgg@...pe.ca, 
	jsnitsel@...hat.com, robh@...nel.org, krzysztof.kozlowski@...aro.org, 
	quic_c_gdjako@...cinc.com, dmitry.baryshkov@...aro.org, iommu@...ts.linux.dev, 
	linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v16 2/5] iommu/arm-smmu: refactor qcom_smmu structure to
 include single pointer

On Tue, Oct 8, 2024 at 5:54 AM Bibek Kumar Patro
<quic_bibekkum@...cinc.com> wrote:
>
> qcom_smmu_match_data is static and constant so refactor qcom_smmu
> to store single pointer to qcom_smmu_match_data instead of
> replicating multiple child members of the same and handle the further
> dereferences in the places that want them.
>
> Suggested-by: Robin Murphy <robin.murphy@....com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Reviewed-by: Rob Clark <robdclark@...il.com>

> Signed-off-by: Bibek Kumar Patro <quic_bibekkum@...cinc.com>
> ---
>  drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c | 2 +-
>  drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c       | 2 +-
>  drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h       | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c
> index 548783f3f8e8..d03b2239baad 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c
> @@ -73,7 +73,7 @@ void qcom_smmu_tlb_sync_debug(struct arm_smmu_device *smmu)
>         if (__ratelimit(&rs)) {
>                 dev_err(smmu->dev, "TLB sync timed out -- SMMU may be deadlocked\n");
>
> -               cfg = qsmmu->cfg;
> +               cfg = qsmmu->data->cfg;
>                 if (!cfg)
>                         return;
>
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> index 0cb10b354802..6e0a2a43e45a 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -534,7 +534,7 @@ static struct arm_smmu_device *qcom_smmu_create(struct arm_smmu_device *smmu,
>                 return ERR_PTR(-ENOMEM);
>
>         qsmmu->smmu.impl = impl;
> -       qsmmu->cfg = data->cfg;
> +       qsmmu->data = data;
>
>         return &qsmmu->smmu;
>  }
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> index 3c134d1a6277..b55cd3e3ae48 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> @@ -8,7 +8,7 @@
>
>  struct qcom_smmu {
>         struct arm_smmu_device smmu;
> -       const struct qcom_smmu_config *cfg;
> +       const struct qcom_smmu_match_data *data;
>         bool bypass_quirk;
>         u8 bypass_cbndx;
>         u32 stall_enabled;
> --
> 2.34.1
>