linux-kernel - Re: [PATCH v8 3/3] iommu/mediatek: Allow page table PA up to 35bit

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Message-ID: <6172e09f04adeade200fe28109e02add89bf722a.camel@mediatek.com>
Date:   Mon, 13 Jun 2022 20:04:39 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     <yf.wang@...iatek.com>
CC:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        "open list:MEDIATEK IOMMU DRIVER" <iommu@...ts.linux-foundation.org>,
        "moderated list:MEDIATEK IOMMU DRIVER" 
        <linux-mediatek@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, Libo Kang <Libo.Kang@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Ning Li <ning.li@...iatek.com>
Subject: Re: [PATCH v8 3/3] iommu/mediatek: Allow page table PA up to 35bit

On Sat, 2022-06-11 at 18:26 +0800, yf.wang@...iatek.com wrote:
> From: Yunfei Wang <yf.wang@...iatek.com>
> 
> Single memory zone feature will remove ZONE_DMA32 and ZONE_DMA. So
> add
> the quirk IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT to let level 1 and level
> 2
> pgtable support at most 35bit PA.
> 
> Signed-off-by: Ning Li <ning.li@...iatek.com>
> Signed-off-by: Yunfei Wang <yf.wang@...iatek.com>

Reviewed-by: Yong Wu <yong.wu@...iatek.com>

Thanks very much for this function. All the lastest SoCs like
mt8192/mt8195 support this.

> ---
>  drivers/iommu/mtk_iommu.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 3d62399e8865..4dbc33758711 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -138,6 +138,7 @@
>  /* PM and clock always on. e.g. infra iommu */
>  #define PM_CLK_AO			BIT(15)
>  #define IFA_IOMMU_PCIE_SUPPORT		BIT(16)
> +#define PGTABLE_PA_35_EN		BIT(17)
>  
>  #define MTK_IOMMU_HAS_FLAG_MASK(pdata, _x, mask)	\
>  				((((pdata)->flags) & (mask)) == (_x))
> @@ -240,6 +241,7 @@ struct mtk_iommu_data {
>  struct mtk_iommu_domain {
>  	struct io_pgtable_cfg		cfg;
>  	struct io_pgtable_ops		*iop;
> +	u32				ttbr;
>  
>  	struct mtk_iommu_bank_data	*bank;
>  	struct iommu_domain		domain;
> @@ -596,6 +598,9 @@ static int mtk_iommu_domain_finalise(struct
> mtk_iommu_domain *dom,
>  		.iommu_dev = data->dev,
>  	};
>  
> +	if (MTK_IOMMU_HAS_FLAG(data->plat_data, PGTABLE_PA_35_EN))
> +		dom->cfg.quirks |= IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT;
> +
>  	if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE))
>  		dom->cfg.oas = data->enable_4GB ? 33 : 32;
>  	else
> @@ -684,8 +689,8 @@ static int mtk_iommu_attach_device(struct
> iommu_domain *domain,
>  			goto err_unlock;
>  		}
>  		bank->m4u_dom = dom;
> -		writel(dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK,
> -		       bank->base + REG_MMU_PT_BASE_ADDR);
> +		bank->m4u_dom->ttbr = MTK_IOMMU_ADDR(dom-
> >cfg.arm_v7s_cfg.ttbr);
> +		writel(bank->m4u_dom->ttbr, data->base +
> REG_MMU_PT_BASE_ADDR);
>  
>  		pm_runtime_put(m4udev);
>  	}
> @@ -1366,8 +1371,7 @@ static int __maybe_unused
> mtk_iommu_runtime_resume(struct device *dev)
>  		writel_relaxed(reg->int_control[i], base +
> REG_MMU_INT_CONTROL0);
>  		writel_relaxed(reg->int_main_control[i], base +
> REG_MMU_INT_MAIN_CONTROL);
>  		writel_relaxed(reg->ivrp_paddr[i], base +
> REG_MMU_IVRP_PADDR);
> -		writel(m4u_dom->cfg.arm_v7s_cfg.ttbr &
> MMU_PT_ADDR_MASK,
> -		       base + REG_MMU_PT_BASE_ADDR);
> +		writel(m4u_dom->ttbr, base + REG_MMU_PT_BASE_ADDR);
>  	} while (++i < data->plat_data->banks_num);
>  
>  	/*
> @@ -1401,7 +1405,7 @@ static const struct mtk_iommu_plat_data
> mt2712_data = {
>  static const struct mtk_iommu_plat_data mt6779_data = {
>  	.m4u_plat      = M4U_MT6779,
>  	.flags         = HAS_SUB_COMM_2BITS | OUT_ORDER_WR_EN |
> WR_THROT_EN |
> -			 MTK_IOMMU_TYPE_MM,
> +			 MTK_IOMMU_TYPE_MM | PGTABLE_PA_35_EN,
>  	.inv_sel_reg   = REG_MMU_INV_SEL_GEN2,
>  	.banks_num    = 1,
>  	.banks_enable = {true},