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Date:   Wed, 21 Aug 2019 16:24:49 +0100
From:   Will Deacon <will@kernel.org>
To:     Yong Wu <yong.wu@mediatek.com>
Cc:     Joerg Roedel <joro@8bytes.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Rob Herring <robh+dt@kernel.org>,
        Evan Green <evgreen@chromium.org>,
        Tomasz Figa <tfiga@google.com>,
        linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        iommu@lists.linux-foundation.org, youlin.pei@mediatek.com,
        Nicolas Boichat <drinkcat@chromium.org>, anan.sun@mediatek.com,
        Matthias Kaehlcke <mka@chromium.org>, cui.zhang@mediatek.com,
        chao.hao@mediatek.com, ming-fan.chen@mediatek.com
Subject: Re: [PATCH v10 09/23] iommu/io-pgtable-arm-v7s: Extend to support
 PA[33:32] for MediaTek
Message-ID: <20190821152448.qmoqjh5zznfpdi6n@willie-the-truck>
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 <1566395606-7975-10-git-send-email-yong.wu@mediatek.com>
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On Wed, Aug 21, 2019 at 09:53:12PM +0800, Yong Wu wrote:
> MediaTek extend the arm v7s descriptor to support up to 34 bits PA where
> the bit32 and bit33 are encoded in the bit9 and bit4 of the PTE
> respectively. Meanwhile the iova still is 32bits.
> 
> Regarding whether the pagetable address could be over 4GB, the mt8183
> support it while the previous mt8173 don't, thus keep it as is.
> 
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> ---
>  drivers/iommu/io-pgtable-arm-v7s.c | 32 +++++++++++++++++++++++++-------
>  include/linux/io-pgtable.h         |  7 +++----
>  2 files changed, 28 insertions(+), 11 deletions(-)

[...]

> @@ -731,7 +747,9 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
>  {
>  	struct arm_v7s_io_pgtable *data;
>  
> -	if (cfg->ias > ARM_V7S_ADDR_BITS || cfg->oas > ARM_V7S_ADDR_BITS)
> +	if (cfg->ias > ARM_V7S_ADDR_BITS ||
> +	    (cfg->oas > ARM_V7S_ADDR_BITS &&
> +	     !(cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT)))

Please can you instead change arm_v7s_alloc_pgtable() so that it allows an
ias of up to 34 when the IO_PGTABLE_QUIRK_ARM_MTK_EXT is set?

With that change:

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

Will