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[34.143.166.62]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20d17fa48cfsm6533885ad.78.2024.10.15.00.45.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Oct 2024 00:45:59 -0700 (PDT) Date: Tue, 15 Oct 2024 07:45:50 +0000 From: Pranjal Shrivastava To: "Peng Fan (OSS)" Cc: Will Deacon , Robin Murphy , Joerg Roedel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Joy Zou , linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Peng Fan , Jason Gunthorpe Subject: Re: [PATCH RFC 0/2] iommu/arm-smmu-v3: bypass streamid zero on i.MX95 Message-ID: References: <20241015-smmuv3-v1-0-e4b9ed1b5501@nxp.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241015-smmuv3-v1-0-e4b9ed1b5501@nxp.com> Hi Peng, On Tue, Oct 15, 2024 at 11:14:41AM +0800, Peng Fan (OSS) wrote: > i.MX95 eDMA3 connects to DSU ACP, supporting dma coherent memory to > memory operations. However TBU is in the path between eDMA3 and ACP, > need to bypass the default SID 0 to make eDMA3 work properly. > > I was also thinking to introduce "bypass-sids = <0xA 0xB 0xC ...>" to > make this reusable for others, but not sure. I could switch to > "bypass-sids" if you prefer. Any reason why you can't use the sysfs to change the iommu domain type? i.e. by using the /sys/kernel/iommu_groups//type AFAIK, the arm-smmu-v3 driver allocates one iommu_group per device. > > Signed-off-by: Peng Fan > --- > Peng Fan (2): > dt-bindings: iommu: arm,smmu-v3: introduce nxp,imx95-bypass-sid-zero > iommu/arm-smmu-v3: Bypass SID0 for NXP i.MX95 > > .../devicetree/bindings/iommu/arm,smmu-v3.yaml | 4 ++++ > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 19 ++++++++++++++++--- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 + > 3 files changed, 21 insertions(+), 3 deletions(-) > --- > base-commit: d61a00525464bfc5fe92c6ad713350988e492b88 > change-id: 20241014-smmuv3-120b24bc4659 > > Best regards, > -- > Peng Fan > > Thanks, Pranjal