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[84.226.167.205]) by smtp.googlemail.com with ESMTPSA id x1sm1437867edl.82.2020.11.11.13.34.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Nov 2020 13:34:27 -0800 (PST) Date: Wed, 11 Nov 2020 22:34:26 +0100 From: Krzysztof Kozlowski To: Yong Wu Subject: Re: [PATCH v4 18/24] iommu/mediatek: Support master use iova over 32bit Message-ID: <20201111213426.GF287176@kozik-lap> References: <20201111123838.15682-1-yong.wu@mediatek.com> <20201111123838.15682-19-yong.wu@mediatek.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201111123838.15682-19-yong.wu@mediatek.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201111_163430_727025_87CA123D X-CRM114-Status: GOOD ( 16.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org, Nicolas Boichat , srv_heupstream@mediatek.com, chao.hao@mediatek.com, Will Deacon , Joerg Roedel , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, Evan Green , Tomasz Figa , iommu@lists.linux-foundation.org, Rob Herring , linux-mediatek@lists.infradead.org, Matthias Brugger , kernel-team@android.com, anan.sun@mediatek.com, Robin Murphy , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Nov 11, 2020 at 08:38:32PM +0800, Yong Wu wrote: > After extending v7s, our pagetable already support iova reach > 16GB(34bit). the master got the iova via dma_alloc_attrs may reach > 34bits, but its HW register still is 32bit. then how to set the > bit32/bit33 iova? this depend on a SMI larb setting(bank_sel). > > we separate whole 16GB iova to four banks: > bank: 0: 0~4G; 1: 4~8G; 2: 8-12G; 3: 12-16G; > The bank number is (iova >> 32). > > We will preassign which bank the larbs belong to. currently we don't > have a interface for master to adjust its bank number. > > Each a bank is a iova_region which is a independent iommu-domain. > the iova range for each iommu-domain can't cross 4G. > > Signed-off-by: Yong Wu > Acked-by: Krzysztof Kozlowski # memory part > --- > drivers/iommu/mtk_iommu.c | 12 +++++++++--- > drivers/memory/mtk-smi.c | 7 +++++++ > include/soc/mediatek/smi.h | 1 + > 3 files changed, 17 insertions(+), 3 deletions(-) > Acked-by: Krzysztof Kozlowski Best regards, Krzysztof _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel