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X-UUID: 0efb29e786b24d63a65f5cad76c89a81-20200721 Received: from mtkcas35.mediatek.inc [(172.27.4.253)] by mailgw02.mediatek.com (envelope-from ) (mailgw01.mediatek.com ESMTP with TLS) with ESMTP id 574409423; Tue, 21 Jul 2020 11:29:02 +0800 Received: from MTKCAS32.mediatek.inc (172.27.4.184) by MTKMBS32N1.mediatek.inc (172.27.4.71) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 21 Jul 2020 11:28:59 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS32.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 21 Jul 2020 11:28:58 +0800 Message-ID: <1595302076.16172.49.camel@mhfsdcap03> Subject: Re: Re: [PATCH 04/21] dt-binding: mediatek: Add binding for mt8192 IOMMU and SMI From: Yong Wu To: Rob Herring Date: Tue, 21 Jul 2020 11:27:56 +0800 In-Reply-To: <20200720231621.GA3106350@bogus> References: <20200711064846.16007-1-yong.wu@mediatek.com> <20200711064846.16007-5-yong.wu@mediatek.com> <20200720231621.GA3106350@bogus> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: D49D8E756E183EDB1F2B9E9AB572BFF9AED4A4D42C576D30129F7E826088FE652000:8 X-MTK: N Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org, Nicolas Boichat , cui.zhang@mediatek.com, srv_heupstream@mediatek.com, Tomasz Figa , Will Deacon , linux-kernel@vger.kernel.org, Evan Green , chao.hao@mediatek.com, iommu@lists.linux-foundation.org, linux-mediatek@lists.infradead.org, Matthias Brugger , ming-fan.chen@mediatek.com, anan.sun@mediatek.com, Robin Murphy , 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 Mon, 2020-07-20 at 17:16 -0600, Rob Herring wrote: > On Sat, Jul 11, 2020 at 02:48:29PM +0800, Yong Wu wrote: > > This patch adds decriptions for mt8192 IOMMU and SMI. > > > > mt8192 also is MTK IOMMU gen2 which uses ARM Short-Descriptor translation > > table format. The M4U-SMI HW diagram is as below: > > > > EMI > > | > > M4U > > | > > ------------ > > SMI Common > > ------------ > > | > > +-------+------+------+----------------------+-------+ > > | | | | ...... | | > > | | | | | | > > larb0 larb1 larb2 larb4 ...... larb19 larb20 > > disp0 disp1 mdp vdec IPE IPE > > > > All the connections are HW fixed, SW can NOT adjust it. > > > > mt8192 M4U support 0~16GB iova range. we preassign different engines > > into different iova ranges: > > > > domain-id module iova-range larbs > > 0 disp 0 ~ 4G larb0/1 > > 1 vcodec 4G ~ 8G larb4/5/7 > > 2 cam/mdp 8G ~ 12G larb2/9/11/13/14/16/17/18/19/20 > > 3 CCU0 0x4000_0000 ~ 0x43ff_ffff larb13: port 9/10 > > 4 CCU1 0x4400_0000 ~ 0x47ff_ffff larb14: port 4/5 > > You probably want to use dma-ranges for defining these > address restrictions. Yes. Please see the commit message of [18/21] in this patchset. > > How is the domain-id used or needed? Here we assign different larb/ports in different iova ranges. In the iommu driver, we will list the iova ranges as above and use the domain-id to get the detailed iova range, then create a iommu domain for each a iova range. For the iommu masters, it only need use its special port in its dtsi node, then the iova got from dma_alloc_attrs for that device will locate in the special iova ranges. > > Rob > > _______________________________________________ > Linux-mediatek mailing list > Linux-mediatek@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-mediatek _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu