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[81.172.57.81]) by smtp.gmail.com with ESMTPSA id 26sm23775565wmj.25.2020.07.06.08.20.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Jul 2020 08:20:05 -0700 (PDT) Subject: Re: [PATCH v6 06/10] iommu/mediatek: Add sub_comm id in translation fault To: Chao Hao , Joerg Roedel , Rob Herring References: <20200703044127.27438-1-chao.hao@mediatek.com> <20200703044127.27438-7-chao.hao@mediatek.com> From: Matthias Brugger Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa OhLZuSKB1F5JcvLbETRjNzNU7B3TdS2+zkgQQdEyt7Ij2HXGLJ2w+yG2GuR9/iyCJRf10Okq gTh//XESJZ8S6KlOWbLXRE+yfkKDXQx2Jr1XuVvM3zPqH5FMg8reRVFsQ+vI0b+OlyekT/Xe 0Hwvqkev95GG6x7yseJwI+2ydDH6M5O7fPKFW5mzAdDE2g/K9B4e2tYK6/rA7Fq4cqiAw1+u EgO44+eFgv082xtBez5WNkGn18vtw0LW3ESmKh19u6kEGoi0WZwslCNaGFrS4M7OH+aOJeqK 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+abzEL6QDAAxn9md8KwrA3RtucNh87cHlDXfUBKa7SRvBjTczDg+HEPNk2u3hrz1j3l2rliQ y1UfYx7Vk/TrdwUIJgKS8QAr8Lw9WuvY2hSqL9vEjx8VAkPWNWPwrQ== Message-ID: <9f05e20f-fec5-de3a-d069-d7835873380a@gmail.com> Date: Mon, 6 Jul 2020 17:20:04 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200703044127.27438-7-chao.hao@mediatek.com> Content-Language: en-US Cc: devicetree@vger.kernel.org, FY Yang , wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, TH Yang , linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 03/07/2020 06:41, Chao Hao wrote: > The max larb number that a iommu HW support is 8(larb0~larb7 in the below > diagram). > If the larb's number is over 8, we use a sub_common for merging > several larbs into one larb. At this case, we will extend larb_id: > bit[11:9] means common-id; > bit[8:7] means subcommon-id; > From these two variables, we could get the real larb number when > translation fault happen. > The diagram is as below: > EMI > | > IOMMU > | > ----------------- > | | > common1 common0 > | | > ----------------- > | > smi common > | > ------------------------------------ > | | | | | | > 3'd0 3'd1 3'd2 3'd3 ... 3'd7 <-common_id(max is 8) > | | | | | | > Larb0 Larb1 | Larb3 ... Larb7 > | > smi sub common > | > -------------------------- > | | | | > 2'd0 2'd1 2'd2 2'd3 <-sub_common_id(max is 4) > | | | | > Larb8 Larb9 Larb10 Larb11 > > In this patch we extend larb_remap[] to larb_remap[8][4] for this. > larb_remap[x][y]: x means common-id above, y means subcommon_id above. > > We can also distinguish if the M4U HW has sub_common by HAS_SUB_COMM > macro. > > Cc: Matthias Brugger > Signed-off-by: Chao Hao > Reviewed-by: Yong Wu Reviewed-by: Matthias Brugger > --- > drivers/iommu/mtk_iommu.c | 21 ++++++++++++++------- > drivers/iommu/mtk_iommu.h | 5 ++++- > 2 files changed, 18 insertions(+), 8 deletions(-) > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > index 533b8f76f592..0d96dcd8612b 100644 > --- a/drivers/iommu/mtk_iommu.c > +++ b/drivers/iommu/mtk_iommu.c > @@ -91,6 +91,8 @@ > #define REG_MMU1_INVLD_PA 0x148 > #define REG_MMU0_INT_ID 0x150 > #define REG_MMU1_INT_ID 0x154 > +#define F_MMU_INT_ID_COMM_ID(a) (((a) >> 9) & 0x7) > +#define F_MMU_INT_ID_SUB_COMM_ID(a) (((a) >> 7) & 0x3) > #define F_MMU_INT_ID_LARB_ID(a) (((a) >> 7) & 0x7) > #define F_MMU_INT_ID_PORT_ID(a) (((a) >> 2) & 0x1f) > > @@ -109,6 +111,7 @@ > #define HAS_VLD_PA_RNG BIT(2) > #define RESET_AXI BIT(3) > #define OUT_ORDER_WR_EN BIT(4) > +#define HAS_SUB_COMM BIT(5) > > #define MTK_IOMMU_HAS_FLAG(pdata, _x) \ > ((((pdata)->flags) & (_x)) == (_x)) > @@ -239,7 +242,7 @@ static irqreturn_t mtk_iommu_isr(int irq, void *dev_id) > struct mtk_iommu_data *data = dev_id; > struct mtk_iommu_domain *dom = data->m4u_dom; > u32 int_state, regval, fault_iova, fault_pa; > - unsigned int fault_larb, fault_port; > + unsigned int fault_larb, fault_port, sub_comm = 0; > bool layer, write; > > /* Read error info from registers */ > @@ -255,10 +258,14 @@ static irqreturn_t mtk_iommu_isr(int irq, void *dev_id) > } > layer = fault_iova & F_MMU_FAULT_VA_LAYER_BIT; > write = fault_iova & F_MMU_FAULT_VA_WRITE_BIT; > - fault_larb = F_MMU_INT_ID_LARB_ID(regval); > fault_port = F_MMU_INT_ID_PORT_ID(regval); > - > - fault_larb = data->plat_data->larbid_remap[fault_larb]; > + if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_SUB_COMM)) { > + fault_larb = F_MMU_INT_ID_COMM_ID(regval); > + sub_comm = F_MMU_INT_ID_SUB_COMM_ID(regval); > + } else { > + fault_larb = F_MMU_INT_ID_LARB_ID(regval); > + } > + fault_larb = data->plat_data->larbid_remap[fault_larb][sub_comm]; > > if (report_iommu_fault(&dom->domain, data->dev, fault_iova, > write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) { > @@ -785,21 +792,21 @@ 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, > - .larbid_remap = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, > + .larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}}, > }; > > static const struct mtk_iommu_plat_data mt8173_data = { > .m4u_plat = M4U_MT8173, > .flags = HAS_4GB_MODE | HAS_BCLK | RESET_AXI, > .inv_sel_reg = REG_MMU_INV_SEL_GEN1, > - .larbid_remap = {0, 1, 2, 3, 4, 5}, /* Linear mapping. */ > + .larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}}, /* Linear mapping. */ > }; > > static const struct mtk_iommu_plat_data mt8183_data = { > .m4u_plat = M4U_MT8183, > .flags = RESET_AXI, > .inv_sel_reg = REG_MMU_INV_SEL_GEN1, > - .larbid_remap = {0, 4, 5, 6, 7, 2, 3, 1}, > + .larbid_remap = {{0}, {4}, {5}, {6}, {7}, {2}, {3}, {1}}, > }; > > static const struct of_device_id mtk_iommu_of_ids[] = { > diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h > index cf53f5e80d22..46d0d47b22e1 100644 > --- a/drivers/iommu/mtk_iommu.h > +++ b/drivers/iommu/mtk_iommu.h > @@ -17,6 +17,9 @@ > #include > #include > > +#define MTK_LARB_COM_MAX 8 > +#define MTK_LARB_SUBCOM_MAX 4 > + > struct mtk_iommu_suspend_reg { > union { > u32 standard_axi_mode;/* v1 */ > @@ -41,7 +44,7 @@ struct mtk_iommu_plat_data { > enum mtk_iommu_plat m4u_plat; > u32 flags; > u32 inv_sel_reg; > - unsigned char larbid_remap[MTK_LARB_NR_MAX]; > + unsigned char larbid_remap[MTK_LARB_COM_MAX][MTK_LARB_SUBCOM_MAX]; > }; > > struct mtk_iommu_domain; > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu