linux-kernel - Re: [PATCH 12/21] iommu/mediatek: Add iova reserved function

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Date:   Tue, 14 Jul 2020 17:32:57 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Pi-Hsun Shih <pihsun@...omium.org>
CC:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>,
        Youlin Pei (裴友林) 
        <youlin.pei@...iatek.com>, Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, <cui.zhang@...iatek.com>,
        <chao.hao@...iatek.com>, <ming-fan.chen@...iatek.com>,
        Hao Chao <hao.chao@...iatek.com>
Subject: Re: [PATCH 12/21] iommu/mediatek: Add iova reserved function

On Mon, 2020-07-13 at 15:33 +0800, Pi-Hsun Shih wrote:
> On Sat, Jul 11, 2020 at 2:51 PM Yong Wu <yong.wu@...iatek.com> wrote:
> >
> > For multiple iommu_domains, we need to reserve some iova regions, so we
> > will add mtk_iommu_iova_region structure. It includes the base address
> > and size of the range.
> > This is a preparing patch for supporting multi-domain.
> >
> > Signed-off-by: Anan sun<anan.sun@...iatek.com>
> > Signed-off-by: Hao Chao<hao.chao@...iatek.com>
> > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > ---
> >  drivers/iommu/mtk_iommu.c | 37 +++++++++++++++++++++++++++++++++++++
> >  drivers/iommu/mtk_iommu.h |  5 +++++
> >  2 files changed, 42 insertions(+)
> >
> > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> > index 03a6d66f4bef..fdfdb75706e0 100644
> > --- a/drivers/iommu/mtk_iommu.c
> > +++ b/drivers/iommu/mtk_iommu.c
> > @@ -151,6 +151,11 @@ static LIST_HEAD(m4ulist); /* List all the M4U HWs */
> > ...
> > +
> > +static void mtk_iommu_put_resv_regions(struct device *dev,
> > +                                      struct list_head *head)
> > +{
> > +       struct iommu_resv_region *entry, *next;
> > +
> > +       list_for_each_entry_safe(entry, next, head, list)
> > +               kfree(entry);
> > +}
> > +
> 
> This is the same as generic_iommu_put_resv_regions, use that as the
> .put_resv_regions callback instead?

Thanks very much for the review.

Yes. I will fix it in next version.

> 
> > ...
> > --
> > 2.18.0