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from ziggy.stardust ([37.223.140.27]) by smtp.gmail.com with ESMTPSA id m6sm4759131ede.2.2019.06.18.09.06.48 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Tue, 18 Jun 2019 09:06:49 -0700 (PDT) Subject: Re: [PATCH v7 19/21] iommu/mediatek: Rename enable_4GB to dram_is_4gb To: Yong Wu , Joerg Roedel , Robin Murphy , Rob Herring Cc: Evan Green , Tomasz Figa , Will Deacon , linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, yingjoe.chen@mediatek.com, youlin.pei@mediatek.com, Nicolas Boichat , anan.sun@mediatek.com, Matthias Kaehlcke References: <1560169080-27134-1-git-send-email-yong.wu@mediatek.com> <1560169080-27134-20-git-send-email-yong.wu@mediatek.com> From: Matthias Brugger Openpgp: preference=signencrypt Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= 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<9bf13c22-0c73-2950-2204-23d577976b03@gmail.com> Date: Tue, 18 Jun 2019 18:06:47 +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: <1560169080-27134-20-git-send-email-yong.wu@mediatek.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Also from my point of view this patch should be done before "[PATCH 06/21] iommu/io-pgtable-arm-v7s: Extend MediaTek 4GB Mode" 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; >