linux-kernel - Re: [PATCH v4 7/7] iommu/mediatek: Remove the tlb-ops for v7s

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Date:   Mon, 18 Jan 2021 18:46:42 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>
Cc:     youlin.pei@...iatek.com, anan.sun@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>,
        srv_heupstream@...iatek.com, chao.hao@...iatek.com,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Tomasz Figa <tfiga@...gle.com>,
        iommu@...ts.linux-foundation.org,
        David Laight <David.Laight@...LAB.COM>,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        kernel-team@...roid.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 7/7] iommu/mediatek: Remove the tlb-ops for v7s

On 2021-01-07 12:29, Yong Wu wrote:
> Until now, we have already used the tlb operations from iommu framework,
> then the tlb operations for v7s can be removed.
> 
> Correspondingly, Switch the paramenter "cookie" to the internal structure.

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>   drivers/iommu/mtk_iommu.c | 27 ++++-----------------------
>   1 file changed, 4 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index d3b8a1649093..86ab577c9520 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -182,10 +182,8 @@ static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
>   	return container_of(dom, struct mtk_iommu_domain, domain);
>   }
>   
> -static void mtk_iommu_tlb_flush_all(void *cookie)
> +static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
>   {
> -	struct mtk_iommu_data *data = cookie;
> -
>   	for_each_m4u(data) {
>   		writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
>   			       data->base + data->plat_data->inv_sel_reg);
> @@ -195,9 +193,9 @@ static void mtk_iommu_tlb_flush_all(void *cookie)
>   }
>   
>   static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
> -					   size_t granule, void *cookie)
> +					   size_t granule,
> +					   struct mtk_iommu_data *data)
>   {
> -	struct mtk_iommu_data *data = cookie;
>   	unsigned long flags;
>   	int ret;
>   	u32 tmp;
> @@ -219,7 +217,7 @@ static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
>   		if (ret) {
>   			dev_warn(data->dev,
>   				 "Partial TLB flush timed out, falling back to full flush\n");
> -			mtk_iommu_tlb_flush_all(cookie);
> +			mtk_iommu_tlb_flush_all(data);
>   		}
>   		/* Clear the CPE status */
>   		writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
> @@ -227,22 +225,6 @@ static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
>   	}
>   }
>   
> -static void mtk_iommu_tlb_flush_page_nosync(struct iommu_iotlb_gather *gather,
> -					    unsigned long iova, size_t granule,
> -					    void *cookie)
> -{
> -	struct mtk_iommu_data *data = cookie;
> -	struct iommu_domain *domain = &data->m4u_dom->domain;
> -
> -	iommu_iotlb_gather_add_page(domain, gather, iova, granule);
> -}
> -
> -static const struct iommu_flush_ops mtk_iommu_flush_ops = {
> -	.tlb_flush_all = mtk_iommu_tlb_flush_all,
> -	.tlb_flush_walk = mtk_iommu_tlb_flush_range_sync,
> -	.tlb_add_page = mtk_iommu_tlb_flush_page_nosync,
> -};
> -
>   static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
>   {
>   	struct mtk_iommu_data *data = dev_id;
> @@ -326,7 +308,6 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom)
>   		.pgsize_bitmap = mtk_iommu_ops.pgsize_bitmap,
>   		.ias = 32,
>   		.oas = 34,
> -		.tlb = &mtk_iommu_flush_ops,
>   		.iommu_dev = data->dev,
>   	};
>   
>