linux-kernel - Re: [PATCH v4 08/24] iommu/io-pgtable-arm-v7s: Extend PA34 for MediaTek

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Date:   Thu, 26 Nov 2020 15:49:19 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>, Will Deacon <will@...nel.org>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, youlin.pei@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>, anan.sun@...iatek.com,
        chao.hao@...iatek.com, Greg Kroah-Hartman <gregkh@...gle.com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v4 08/24] iommu/io-pgtable-arm-v7s: Extend PA34 for
 MediaTek

On 2020-11-11 12:38, Yong Wu wrote:
> MediaTek extend the bit5 in lvl1 and lvl2 descriptor as PA34.

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

> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Acked-by: Will Deacon <will@...nel.org>
> ---
>   drivers/iommu/io-pgtable-arm-v7s.c | 9 +++++++--
>   drivers/iommu/mtk_iommu.c          | 2 +-
>   include/linux/io-pgtable.h         | 4 ++--
>   3 files changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
> index e880745ab1e8..4d0aa079470f 100644
> --- a/drivers/iommu/io-pgtable-arm-v7s.c
> +++ b/drivers/iommu/io-pgtable-arm-v7s.c
> @@ -112,9 +112,10 @@
>   #define ARM_V7S_TEX_MASK		0x7
>   #define ARM_V7S_ATTR_TEX(val)		(((val) & ARM_V7S_TEX_MASK) << ARM_V7S_TEX_SHIFT)
>   
> -/* MediaTek extend the two bits for PA 32bit/33bit */
> +/* MediaTek extend the bits below for PA 32bit/33bit/34bit */
>   #define ARM_V7S_ATTR_MTK_PA_BIT32	BIT(9)
>   #define ARM_V7S_ATTR_MTK_PA_BIT33	BIT(4)
> +#define ARM_V7S_ATTR_MTK_PA_BIT34	BIT(5)
>   
>   /* *well, except for TEX on level 2 large pages, of course :( */
>   #define ARM_V7S_CONT_PAGE_TEX_SHIFT	6
> @@ -194,6 +195,8 @@ static arm_v7s_iopte paddr_to_iopte(phys_addr_t paddr, int lvl,
>   		pte |= ARM_V7S_ATTR_MTK_PA_BIT32;
>   	if (paddr & BIT_ULL(33))
>   		pte |= ARM_V7S_ATTR_MTK_PA_BIT33;
> +	if (paddr & BIT_ULL(34))
> +		pte |= ARM_V7S_ATTR_MTK_PA_BIT34;
>   	return pte;
>   }
>   
> @@ -218,6 +221,8 @@ static phys_addr_t iopte_to_paddr(arm_v7s_iopte pte, int lvl,
>   		paddr |= BIT_ULL(32);
>   	if (pte & ARM_V7S_ATTR_MTK_PA_BIT33)
>   		paddr |= BIT_ULL(33);
> +	if (pte & ARM_V7S_ATTR_MTK_PA_BIT34)
> +		paddr |= BIT_ULL(34);
>   	return paddr;
>   }
>   
> @@ -754,7 +759,7 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
>   	if (cfg->ias > ARM_V7S_ADDR_BITS)
>   		return NULL;
>   
> -	if (cfg->oas > (arm_v7s_is_mtk_enabled(cfg) ? 34 : ARM_V7S_ADDR_BITS))
> +	if (cfg->oas > (arm_v7s_is_mtk_enabled(cfg) ? 35 : ARM_V7S_ADDR_BITS))
>   		return NULL;
>   
>   	if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 6451d83753e1..ec3c87d4b172 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -320,7 +320,7 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom)
>   			IO_PGTABLE_QUIRK_ARM_MTK_EXT,
>   		.pgsize_bitmap = mtk_iommu_ops.pgsize_bitmap,
>   		.ias = 32,
> -		.oas = 34,
> +		.oas = 35,
>   		.tlb = &mtk_iommu_flush_ops,
>   		.iommu_dev = data->dev,
>   	};
> diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
> index 4cde111e425b..1ae0757f4f94 100644
> --- a/include/linux/io-pgtable.h
> +++ b/include/linux/io-pgtable.h
> @@ -77,8 +77,8 @@ struct io_pgtable_cfg {
>   	 *	TLB maintenance when mapping as well as when unmapping.
>   	 *
>   	 * IO_PGTABLE_QUIRK_ARM_MTK_EXT: (ARM v7s format) MediaTek IOMMUs extend
> -	 *	to support up to 34 bits PA where the bit32 and bit33 are
> -	 *	encoded in the bit9 and bit4 of the PTE respectively.
> +	 *	to support up to 35 bits PA where the bit32, bit33 and bit34 are
> +	 *	encoded in the bit9, bit4 and bit5 of the PTE respectively.
>   	 *
>   	 * IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs
>   	 *	on unmap, for DMA domains using the flush queue mechanism for
>