linux-kernel - Re: [PATCH 07/18] iommu/arm-smmu: Remove arch/arm workaround

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Message-ID: <20200821080724.GA20060@willie-the-truck>
Date:   Fri, 21 Aug 2020 09:07:25 +0100
From:   Will Deacon <will@...nel.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     hch@....de, joro@...tes.org, linux@...linux.org.uk,
        inki.dae@...sung.com, sw0312.kim@...sung.com,
        kyungmin.park@...sung.com, m.szyprowski@...sung.com,
        agross@...nel.org, bjorn.andersson@...aro.org,
        thierry.reding@...il.com, jonathanh@...dia.com, vdumpa@...dia.com,
        digetx@...il.com, matthias.bgg@...il.com, yong.wu@...iatek.com,
        geert+renesas@...der.be, magnus.damm@...il.com, t-kristo@...com,
        s-anna@...com, laurent.pinchart@...asonboard.com,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        linux-samsung-soc@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/18] iommu/arm-smmu: Remove arch/arm workaround

On Thu, Aug 20, 2020 at 04:08:26PM +0100, Robin Murphy wrote:
> Now that arch/arm is wired up for default domains and iommu-dma, remove
> the add_device workaround.
> 
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> ---
>  drivers/iommu/arm/arm-smmu/arm-smmu.c | 10 ----------
>  1 file changed, 10 deletions(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> index 09c42af9f31e..4e52d8cb67dd 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> @@ -1164,17 +1164,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
>  		return -ENXIO;
>  	}
>  
> -	/*
> -	 * FIXME: The arch/arm DMA API code tries to attach devices to its own
> -	 * domains between of_xlate() and probe_device() - we have no way to cope
> -	 * with that, so until ARM gets converted to rely on groups and default
> -	 * domains, just say no (but more politely than by dereferencing NULL).
> -	 * This should be at least a WARN_ON once that's sorted.
> -	 */
>  	cfg = dev_iommu_priv_get(dev);
> -	if (!cfg)
> -		return -ENODEV;
> -
>  	smmu = cfg->smmu;
>  
>  	ret = arm_smmu_rpm_get(smmu);

Acked-by: Will Deacon <will@...nel.org>

Will