linux-kernel - Re: [PATCH v3 08/20] iommu/sprd: Remove detach

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Date:   Wed, 30 Nov 2022 17:03:09 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Rob Clark <robdclark@...il.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Yong Wu <yong.wu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Thierry Reding <thierry.reding@...il.com>,
        iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/20] iommu/sprd: Remove detach_dev callback

On Mon, 28 Nov 2022 at 14:55, Lu Baolu <baolu.lu@...ux.intel.com> wrote:
>
> The IOMMU driver supports default domain, so the detach_dev op will never
> be called. Remove it to avoid dead code.
>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

Acked-by: Chunyan Zhang <zhang.lyra@...il.com>

Thanks,
Chunyan

> ---
>  drivers/iommu/sprd-iommu.c | 16 ----------------
>  1 file changed, 16 deletions(-)
>
> diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
> index 219bfa11f7f4..ae94d74b73f4 100644
> --- a/drivers/iommu/sprd-iommu.c
> +++ b/drivers/iommu/sprd-iommu.c
> @@ -255,21 +255,6 @@ static int sprd_iommu_attach_device(struct iommu_domain *domain,
>         return 0;
>  }
>
> -static void sprd_iommu_detach_device(struct iommu_domain *domain,
> -                                            struct device *dev)
> -{
> -       struct sprd_iommu_domain *dom = to_sprd_domain(domain);
> -       struct sprd_iommu_device *sdev = dom->sdev;
> -       size_t pgt_size = sprd_iommu_pgt_size(domain);
> -
> -       if (!sdev)
> -               return;
> -
> -       dma_free_coherent(sdev->dev, pgt_size, dom->pgt_va, dom->pgt_pa);
> -       sprd_iommu_hw_en(sdev, false);
> -       dom->sdev = NULL;
> -}
> -
>  static int sprd_iommu_map(struct iommu_domain *domain, unsigned long iova,
>                           phys_addr_t paddr, size_t pgsize, size_t pgcount,
>                           int prot, gfp_t gfp, size_t *mapped)
> @@ -414,7 +399,6 @@ static const struct iommu_ops sprd_iommu_ops = {
>         .owner          = THIS_MODULE,
>         .default_domain_ops = &(const struct iommu_domain_ops) {
>                 .attach_dev     = sprd_iommu_attach_device,
> -               .detach_dev     = sprd_iommu_detach_device,
>                 .map_pages      = sprd_iommu_map,
>                 .unmap_pages    = sprd_iommu_unmap,
>                 .iotlb_sync_map = sprd_iommu_sync_map,
> --
> 2.34.1
>