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

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Date:   Mon, 13 Jul 2020 15:33:50 +0800
From:   Pi-Hsun Shih <pihsun@...omium.org>
To:     Yong Wu <yong.wu@...iatek.com>
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 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?

> ...
> --
> 2.18.0