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<1560169080-27134-1-git-send-email-yong.wu@mediatek.com> <1560169080-27134-20-git-send-email-yong.wu@mediatek.com> <9bf13c22-0c73-2950-2204-23d577976b03@gmail.com> <1561039192.4021.23.camel@mhfsdcap03> From: Matthias Brugger Openpgp: preference=signencrypt 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 fx5dIv2CEbxc6xnHY7dwkcHikTA4QdbdFeUSuj4YhIZ+0QlDVtS1QEXyvZbZky7ur9rHkZvP ZqlUsLJ2nOqsmahMTIQ8Mgx9SLEShWqD4kOF4zNfPJsgEMB49KbS2o9jxbGB+JKupjNddfxZ HlH1KF8QwCMZEYaTNogrVazuEJzx6JdRpR3sFda/0x5qjTadwIW6Cl9tkqe2h391dOGX1eOA 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HpE/D9sM+xACs803lFUIZC5H62G059cCPAXKgsFpNMKmBAWweBkVJAisoQeX50OP+/11ArV0 cv+fOTfJj0/KwFXJaaYh3LUQNILLBNxkSrhCLl8dUg53IbHx4NfIAgqxLWGfXM8DY1aFdU79 pac005PuhxCWkKTJz3gCmznnoat4GCnL5gy/m0Qk45l4PFqwWXVLo9AQg2Kp3mlIFZ6fsEKI AN5hxlbNvNb9V2Zo5bFZjPWPFTxOteM0omUAS+QopwU0yPLLGJVf2iCmItHcUXI+r2JwH1CJ jrHWeQEI2ucSKsNa8FllDmG/fQ== Message-ID: Date: Fri, 21 Jun 2019 12:10:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <1561039192.4021.23.camel@mhfsdcap03> Content-Language: en-US Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org, Nicolas Boichat , srv_heupstream@mediatek.com, Will Deacon , linux-kernel@vger.kernel.org, Evan Green , Tomasz Figa , iommu@lists.linux-foundation.org, Rob Herring , linux-mediatek@lists.infradead.org, yingjoe.chen@mediatek.com, anan.sun@mediatek.com, Robin Murphy , Matthias Kaehlcke , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 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 Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On 20/06/2019 15:59, Yong Wu wrote: > On Tue, 2019-06-18 at 18:06 +0200, Matthias Brugger wrote: >> >> On 10/06/2019 14:17, Yong Wu wrote: >>> This patch only rename the variable name from enable_4GB to >>> dram_is_4gb for readable. >> >> From my understanding this is true when available RAM > 4GB so I think the name >> should be something like dram_bigger_4gb otherwise it may create confusion again. > > Strictly, It is not "dram_bigger_4gb". actually if the dram size is over > 3GB (the first 1GB is the register space), the "4GB mode" will be > enabled. then how about the name "dram_enable_32bit"?(the PA 32bit will > be enabled in the 4GB mode.) Ok I think dram_is_4gb is ok then. But I'd suggest to add an explanation above the struct mtk_iommu_data to explain exactly what this means. > > There is another option, please see the last part in [1] suggested by > Evan, something like below: > ---- > data->enable_4GB = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT)); > if (!data->plat_data->has_4gb_mode) > data->enable_4GB = false; > Then mtk_iommu_map would only have: > if (data->enable_4GB) > paddr |= BIT_ULL(32); > ---- I think that's a nicer way to handle it. Regards, Matthias > > Which one do you prefer? > > [1] https://lore.kernel.org/patchwork/patch/1028421/ > >> >> Also from my point of view this patch should be done before >> "[PATCH 06/21] iommu/io-pgtable-arm-v7s: Extend MediaTek 4GB Mode" > > OK. > >> >> Regards, >> Matthias >> >>> >>> Signed-off-by: Yong Wu >>> Reviewed-by: Evan Green >>> --- >>> drivers/iommu/mtk_iommu.c | 10 +++++----- >>> drivers/iommu/mtk_iommu.h | 2 +- >>> 2 files changed, 6 insertions(+), 6 deletions(-) >>> >>> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c >>> index 86158d8..67cab2d 100644 >>> --- a/drivers/iommu/mtk_iommu.c >>> +++ b/drivers/iommu/mtk_iommu.c >>> @@ -382,7 +382,7 @@ static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova, >>> int ret; >>> >>> /* The "4GB mode" M4U physically can not use the lower remap of Dram. */ >>> - if (data->plat_data->has_4gb_mode && data->enable_4GB) >>> + if (data->plat_data->has_4gb_mode && data->dram_is_4gb) >>> paddr |= BIT_ULL(32); >>> >>> spin_lock_irqsave(&dom->pgtlock, flags); >>> @@ -554,13 +554,13 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data) >>> writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL); >>> >>> if (data->plat_data->m4u_plat == M4U_MT8173) >>> - regval = (data->protect_base >> 1) | (data->enable_4GB << 31); >>> + regval = (data->protect_base >> 1) | (data->dram_is_4gb << 31); >>> else >>> regval = lower_32_bits(data->protect_base) | >>> upper_32_bits(data->protect_base); >>> writel_relaxed(regval, data->base + REG_MMU_IVRP_PADDR); >>> >>> - if (data->enable_4GB && data->plat_data->has_vld_pa_rng) { >>> + if (data->dram_is_4gb && data->plat_data->has_vld_pa_rng) { >>> /* >>> * If 4GB mode is enabled, the validate PA range is from >>> * 0x1_0000_0000 to 0x1_ffff_ffff. here record bit[32:30]. >>> @@ -611,8 +611,8 @@ static int mtk_iommu_probe(struct platform_device *pdev) >>> return -ENOMEM; >>> data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); >>> >>> - /* Whether the current dram is over 4GB */ >>> - data->enable_4GB = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT)); >>> + /* Whether the current dram is 4GB. */ >>> + data->dram_is_4gb = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT)); >>> >>> res = platform_get_resource(pdev, IORESOURCE_MEM, 0); >>> data->base = devm_ioremap_resource(dev, res); >>> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h >>> index 753266b..e8114b2 100644 >>> --- a/drivers/iommu/mtk_iommu.h >>> +++ b/drivers/iommu/mtk_iommu.h >>> @@ -65,7 +65,7 @@ struct mtk_iommu_data { >>> struct mtk_iommu_domain *m4u_dom; >>> struct iommu_group *m4u_group; >>> struct mtk_smi_iommu smi_imu; /* SMI larb iommu info */ >>> - bool enable_4GB; >>> + bool dram_is_4gb; >>> bool tlb_flush_active; >>> >>> struct iommu_device iommu; >>> > > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu