linux-kernel - Re: [PATCH v3 4/7] iommu/mediatek: Delete the leaf in the tlb flush

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Date:   Tue, 15 Oct 2019 13:25:18 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Robin Murphy <robin.murphy@....com>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Joerg Roedel <joro@...tes.org>,
        Will Deacon <will.deacon@....com>, <youlin.pei@...iatek.com>,
        <anan.sun@...iatek.com>, Nicolas Boichat <drinkcat@...omium.org>,
        <cui.zhang@...iatek.com>, <srv_heupstream@...iatek.com>,
        <chao.hao@...iatek.com>, <edison.hsieh@...iatek.com>,
        <linux-kernel@...r.kernel.org>, Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        <iommu@...ts.linux-foundation.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 4/7] iommu/mediatek: Delete the leaf in the tlb flush

On Mon, 2019-10-14 at 15:22 +0100, Robin Murphy wrote:
> On 14/10/2019 07:38, Yong Wu wrote:
> > In our tlb range flush, we don't care the "leaf". Remove it to simplify
> > the code. no functional change.
> 
> Presumably you don't care about the granule either?

Yes. I only keep "granule" to satisfy the format of "tlb_flush_walk",
then it's no need add a new helper function.

> 
> Robin.
> 
> > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > ---
> >   drivers/iommu/mtk_iommu.c | 16 ++++------------
> >   1 file changed, 4 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> > index 8712afc..19f936c 100644
> > --- a/drivers/iommu/mtk_iommu.c
> > +++ b/drivers/iommu/mtk_iommu.c
> > @@ -174,8 +174,7 @@ static void mtk_iommu_tlb_flush_all(void *cookie)
> >   }
> >   
> >   static void mtk_iommu_tlb_add_flush_nosync(unsigned long iova, size_t size,
> > -					   size_t granule, bool leaf,
> > -					   void *cookie)
> > +					   size_t granule, void *cookie)
> >   {
> >   	struct mtk_iommu_data *data = cookie;
> >   
> > @@ -219,14 +218,7 @@ static void mtk_iommu_tlb_sync(void *cookie)
> >   static void mtk_iommu_tlb_flush_walk(unsigned long iova, size_t size,
> >   				     size_t granule, void *cookie)
> >   {
> > -	mtk_iommu_tlb_add_flush_nosync(iova, size, granule, false, cookie);
> > -	mtk_iommu_tlb_sync(cookie);
> > -}
> > -
> > -static void mtk_iommu_tlb_flush_leaf(unsigned long iova, size_t size,
> > -				     size_t granule, void *cookie)
> > -{
> > -	mtk_iommu_tlb_add_flush_nosync(iova, size, granule, true, cookie);
> > +	mtk_iommu_tlb_add_flush_nosync(iova, size, granule, cookie);
> >   	mtk_iommu_tlb_sync(cookie);
> >   }
> >   
> > @@ -245,7 +237,7 @@ static void mtk_iommu_tlb_flush_page_nosync(struct iommu_iotlb_gather *gather,
> >   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_walk,
> > -	.tlb_flush_leaf = mtk_iommu_tlb_flush_leaf,
> > +	.tlb_flush_leaf = mtk_iommu_tlb_flush_walk,
> >   	.tlb_add_page = mtk_iommu_tlb_flush_page_nosync,
> >   };
> >   
> > @@ -475,7 +467,7 @@ static void mtk_iommu_iotlb_sync(struct iommu_domain *domain,
> >   		spin_lock_irqsave(&dom->pgtlock, flags);
> >   
> >   	mtk_iommu_tlb_add_flush_nosync(gather->start, length, gather->pgsize,
> > -				       false, data);
> > +				       data);
> >   	mtk_iommu_tlb_sync(data);
> >   
> >   	if (!is_in_gather)
> > 
> 
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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