linux-kernel - Re: [PATCH v4 17/24] iommu/mediatek: Add single domain

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Date:   Thu, 26 Nov 2020 17:11:58 +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 17/24] iommu/mediatek: Add single domain

On 2020-11-11 12:38, Yong Wu wrote:
> Defaultly the iova range is 0-4G. here we add a single-domain(0-4G)
> for the previous SoC. this also is a preparing patch for supporting
> multi-domains.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>   drivers/iommu/mtk_iommu.c | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index bf3f4e0f4748..a7727a3899d1 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -161,6 +161,10 @@ struct mtk_iommu_iova_region {
>   	unsigned long long	size;
>   };
>   
> +static const struct mtk_iommu_iova_region single_domain[] = {
> +	{.iova_base = 0,		.size = SZ_4G},
> +};

Hang on, given how the previous patch works, surely this means you're 
now going to *reserve* the entire address space? That doesn't seem 
right... :/

Robin.

> +
>   /*
>    * There may be 1 or 2 M4U HWs, But we always expect they are in the same domain
>    * for the performance.
> @@ -922,6 +926,8 @@ static const struct mtk_iommu_plat_data mt2712_data = {
>   	.m4u_plat     = M4U_MT2712,
>   	.flags        = HAS_4GB_MODE | HAS_BCLK | HAS_VLD_PA_RNG,
>   	.inv_sel_reg  = REG_MMU_INV_SEL_GEN1,
> +	.iova_region  = single_domain,
> +	.iova_region_nr = ARRAY_SIZE(single_domain),
>   	.larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}},
>   };
>   
> @@ -929,6 +935,8 @@ static const struct mtk_iommu_plat_data mt6779_data = {
>   	.m4u_plat      = M4U_MT6779,
>   	.flags         = HAS_SUB_COMM | OUT_ORDER_WR_EN | WR_THROT_EN,
>   	.inv_sel_reg   = REG_MMU_INV_SEL_GEN2,
> +	.iova_region   = single_domain,
> +	.iova_region_nr = ARRAY_SIZE(single_domain),
>   	.larbid_remap  = {{0}, {1}, {2}, {3}, {5}, {7, 8}, {10}, {9}},
>   };
>   
> @@ -944,6 +952,8 @@ static const struct mtk_iommu_plat_data mt8173_data = {
>   	.flags	      = HAS_4GB_MODE | HAS_BCLK | RESET_AXI |
>   			HAS_LEGACY_IVRP_PADDR,
>   	.inv_sel_reg  = REG_MMU_INV_SEL_GEN1,
> +	.iova_region  = single_domain,
> +	.iova_region_nr = ARRAY_SIZE(single_domain),
>   	.larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}}, /* Linear mapping. */
>   };
>   
> @@ -951,6 +961,8 @@ static const struct mtk_iommu_plat_data mt8183_data = {
>   	.m4u_plat     = M4U_MT8183,
>   	.flags        = RESET_AXI,
>   	.inv_sel_reg  = REG_MMU_INV_SEL_GEN1,
> +	.iova_region  = single_domain,
> +	.iova_region_nr = ARRAY_SIZE(single_domain),
>   	.larbid_remap = {{0}, {4}, {5}, {6}, {7}, {2}, {3}, {1}},
>   };
>   
>