From: Matthias Brugger <matthias.bgg@gmail.com>
To: Chao Hao <chao.hao@mediatek.com>, Joerg Roedel <joro@8bytes.org>,
Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org, FY Yang <fy.yang@mediatek.com>,
wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org,
Evan Green <evgreen@chromium.org>,
iommu@lists.linux-foundation.org,
linux-mediatek@lists.infradead.org,
Yong Wu <yong.wu@mediatek.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v5 09/10] iommu/mediatek: Modify MMU_CTRL register setting
Date: Mon, 29 Jun 2020 12:28:04 +0200 [thread overview]
Message-ID: <e063a5d2-8edc-9cf9-4872-d3f4abb1e481@gmail.com> (raw)
In-Reply-To: <20200629071310.1557-10-chao.hao@mediatek.com>
On 29/06/2020 09:13, Chao Hao wrote:
> MT8173 is different from other SoCs for MMU_CTRL register.
> For mt8173, its bit9 is in_order_write_en and doesn't use its
> default 1'b1.> For other SoCs, bit[12] represents victim_tlb_en feature and
> victim_tlb is enable defaultly(bit[12]=1), if we use
> "regval = F_MMU_TF_PROT_TO_PROGRAM_ADDR", victim_tlb will be
> disabled, it will drop iommu performace.
> So we need to deal with the setting of MMU_CTRL separately
> for mt8173 and others.
>
My proposal to rewrite the commit message:
The MMU_CTRL regiser of MT8173 is different from other SoCs. The in_order_wr_en
is bit[9] which is zero by default.
Other SoCs have the vitcim_tlb_en feature mapped to bit[12]. This bit is set to
one by default. We need to preserve the bit when setting
F_MMU_TF_PROT_TO_PROGRAM_ADDR as otherwise the bit will be cleared and IOMMU
performance will drop.
> Suggested-by: Matthias Brugger <matthias.bgg@gmail.com>
> Suggested-by: Yong Wu <yong.wu@mediatek.com>
> Signed-off-by: Chao Hao <chao.hao@mediatek.com>
> ---
> drivers/iommu/mtk_iommu.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 8299a3299090..e46e2deee3fd 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -543,11 +543,12 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
> return ret;
> }
>
> + regval = readl_relaxed(data->base + REG_MMU_CTRL_REG);
The read is only needed in the else branch.
> if (data->plat_data->m4u_plat == M4U_MT8173)
> regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
> F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173;
> else
> - regval = F_MMU_TF_PROT_TO_PROGRAM_ADDR;
> + regval |= F_MMU_TF_PROT_TO_PROGRAM_ADDR;
> writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
>
> regval = F_L2_MULIT_HIT_EN |
>
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next prev parent reply other threads:[~2020-06-29 10:29 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-29 7:13 [PATCH v5 00/10] MT6779 IOMMU SUPPORT Chao Hao
2020-06-29 7:13 ` [PATCH v5 01/10] dt-bindings: mediatek: Add bindings for MT6779 Chao Hao
2020-06-29 7:13 ` [PATCH v5 02/10] iommu/mediatek: Rename the register STANDARD_AXI_MODE(0x48) to MISC_CTRL Chao Hao
2020-06-29 7:13 ` [PATCH v5 03/10] iommu/mediatek: Modify the usage of mtk_iommu_plat_data structure Chao Hao
2020-06-29 9:11 ` Matthias Brugger
2020-06-30 10:56 ` Yong Wu
2020-06-30 11:55 ` chao hao
2020-06-29 7:13 ` [PATCH v5 04/10] iommu/mediatek: Setting MISC_CTRL register Chao Hao
2020-06-29 9:28 ` Matthias Brugger
2020-06-30 10:53 ` chao hao
2020-07-01 14:58 ` Matthias Brugger
2020-07-03 2:38 ` chao hao
2020-06-29 7:13 ` [PATCH v5 05/10] iommu/mediatek: Move inv_sel_reg into the plat_data Chao Hao
2020-06-29 7:13 ` [PATCH v5 06/10] iommu/mediatek: Add sub_comm id in translation fault Chao Hao
2020-06-30 10:55 ` Yong Wu
2020-06-30 11:07 ` chao hao
2020-06-29 7:13 ` [PATCH v5 07/10] iommu/mediatek: Add REG_MMU_WR_LEN register definition Chao Hao
2020-06-29 10:16 ` Matthias Brugger
2020-06-30 10:59 ` chao hao
2020-07-01 15:00 ` Matthias Brugger
2020-06-29 7:13 ` [PATCH v5 08/10] iommu/mediatek: Extend protect pa alignment value Chao Hao
2020-06-29 10:17 ` Matthias Brugger
2020-06-29 7:13 ` [PATCH v5 09/10] iommu/mediatek: Modify MMU_CTRL register setting Chao Hao
2020-06-29 10:28 ` Matthias Brugger [this message]
2020-06-30 11:02 ` chao hao
2020-06-29 7:13 ` [PATCH v5 10/10] iommu/mediatek: Add mt6779 basic support Chao Hao
2020-06-29 10:29 ` Matthias Brugger
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