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Date: Fri, 19 Jun 2020 18:50:24 +0800
From: chao hao <Chao.Hao@...iatek.com>
To: Matthias Brugger <matthias.bgg@...il.com>
CC: Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
<iommu@...ts.linux-foundation.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
Yong Wu <yong.wu@...iatek.com>, FY Yang <fy.yang@...iatek.com>,
Chao Hao <chao.hao@...iatek.com>
Subject: Re: [PATCH v4 7/7] iommu/mediatek: Add mt6779 basic support
On Thu, 2020-06-18 at 18:00 +0200, Matthias Brugger wrote:
>
> On 18/06/2020 13:54, chao hao wrote:
> > On Wed, 2020-06-17 at 11:33 +0200, Matthias Brugger wrote:
> >>
> >> On 17/06/2020 05:00, Chao Hao wrote:
> >>> 1. Start from mt6779, INVLDT_SEL move to offset=0x2c, so we add
> >>> REG_MMU_INV_SEL_GEN2 definition and mt6779 uses it.
> >>> 2. Change PROTECT_PA_ALIGN from 128 byte to 256 byte.
> >>> 3. For REG_MMU_CTRL_REG register, we only need to change bit[2:0],
> >>> others bits keep default value, ex: enable victim tlb.
> >>> 4. Add mt6779_data to support mm_iommu HW init.
> >>>
> >>> Change since v3:
> >>> 1. When setting MMU_CTRL_REG, we don't need to include mt8173.
> >>>
> >>> Cc: Yong Wu <yong.wu@...iatek.com>
> >>> Signed-off-by: Chao Hao <chao.hao@...iatek.com>
> >>> ---
> >>> drivers/iommu/mtk_iommu.c | 20 ++++++++++++++++++--
> >>> drivers/iommu/mtk_iommu.h | 1 +
> >>> 2 files changed, 19 insertions(+), 2 deletions(-)
> >>>
> >>> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> >>> index c706bca6487e..def2e996683f 100644
> >>> --- a/drivers/iommu/mtk_iommu.c
> >>> +++ b/drivers/iommu/mtk_iommu.c
> >>> @@ -37,6 +37,11 @@
> >>> #define REG_MMU_INVLD_START_A 0x024
> >>> #define REG_MMU_INVLD_END_A 0x028
> >>>
> >>> +/* In latest Coda, MMU_INV_SEL's offset is changed to 0x02c.
> >>> + * So we named offset = 0x02c to "REG_MMU_INV_SEL_GEN2"
> >>> + * and offset = 0x038 to "REG_MMU_INV_SEL_GEN1".
> >>> + */
> >>
> >> Please delete the comment, this should be understandable from the git history
> >
> > ok, thanks
> >
> >>
> >>> +#define REG_MMU_INV_SEL_GEN2 0x02c
> >>> #define REG_MMU_INV_SEL_GEN1 0x038
> >>> #define F_INVLD_EN0 BIT(0)
> >>> #define F_INVLD_EN1 BIT(1)
> >>> @@ -98,7 +103,7 @@
> >>> #define F_MMU_INT_ID_LARB_ID(a) (((a) >> 7) & 0x7)
> >>> #define F_MMU_INT_ID_PORT_ID(a) (((a) >> 2) & 0x1f)
> >>>
> >>> -#define MTK_PROTECT_PA_ALIGN 128
> >>> +#define MTK_PROTECT_PA_ALIGN 256
> >>
> >> Do we need 512 bytes for all gen2 IOMMUs?
> >> I'm not sure if we should add this in plat_data or if we should just bump up the
> >> value for all SoCs.
> >> In both cases this should be a separate patch.
> >>
> > From mt6779, MTK_PROTECT_PA_ALIGN is extend to 256 bytes and don't be
> > changed for a long time from our HW designer comment. The legacy iommu
> > also can use it, mabye it doesn't set it by platform.
> >
>
> Ok then just bump it to 256 in a new patch. Thanks for clarification.
Ok, thanks
> >
> >>>
> >>> /*
> >>> * Get the local arbiter ID and the portid within the larb arbiter
> >>> @@ -543,11 +548,12 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
> >>> return ret;
> >>> }
> >>>
> >>> + regval = readl_relaxed(data->base + REG_MMU_CTRL_REG);
> >>> 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;
> >>
> >> Why do we change this, is it that the bootloader for mt6779 set some values in
> >> the register we have to keep? In this case I think we should update the regval
> >> accordingly.
> >
> > For REG_MMU_CTRL_REG, bit[12] represents victim_tlb_en feature and
> > victim_tlb is enable defaultly(bit[12]=1),but if we use "regval =
> > F_MMU_TF_PROT_TO_PROGRAM_ADDR", victim_tlb will disable, it will drop
> > iommu performace for mt6779
> >
>
> Got it. Please put that in a separate patch then.
>
Ok, thanks
> Regards,
> Matthias
>
> >
> >>
> >>> writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
> >>>
> >>> regval = F_L2_MULIT_HIT_EN |
> >>> @@ -797,6 +803,15 @@ static const struct mtk_iommu_plat_data mt2712_data = {
> >>> .larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}},
> >>> };
> >>>
> >>> +static const struct mtk_iommu_plat_data mt6779_data = {
> >>> + .m4u_plat = M4U_MT6779,
> >>> + .has_sub_comm = true,
> >>> + .has_wr_len = true,
> >>> + .has_misc_ctrl = true,
> >>> + .inv_sel_reg = REG_MMU_INV_SEL_GEN2,
> >>> + .larbid_remap = {{0}, {1}, {2}, {3}, {5}, {7, 8}, {10}, {9}},
> >>> +};
> >>> +
> >>> static const struct mtk_iommu_plat_data mt8173_data = {
> >>> .m4u_plat = M4U_MT8173,
> >>> .has_4gb_mode = true,
> >>> @@ -815,6 +830,7 @@ static const struct mtk_iommu_plat_data mt8183_data = {
> >>>
> >>> static const struct of_device_id mtk_iommu_of_ids[] = {
> >>> { .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
> >>> + { .compatible = "mediatek,mt6779-m4u", .data = &mt6779_data},
> >>> { .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
> >>> { .compatible = "mediatek,mt8183-m4u", .data = &mt8183_data},
> >>> {}
> >>> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> >>> index 9971cedd72ea..fb79e710c8d9 100644
> >>> --- a/drivers/iommu/mtk_iommu.h
> >>> +++ b/drivers/iommu/mtk_iommu.h
> >>> @@ -31,6 +31,7 @@ struct mtk_iommu_suspend_reg {
> >>> enum mtk_iommu_plat {
> >>> M4U_MT2701,
> >>> M4U_MT2712,
> >>> + M4U_MT6779,
> >>> M4U_MT8173,
> >>> M4U_MT8183,
> >>> };
> >>>
> >
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