linux-kernel - [PATCH RFC 0/2] iommu/arm-smmu-v3: bypass streamid zero on i.MX95

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Message-Id: <20241015-smmuv3-v1-0-e4b9ed1b5501@nxp.com>
Date: Tue, 15 Oct 2024 11:14:41 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>, 
 Joerg Roedel <joro@...tes.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Joy Zou <joy.zou@....com>, linux-arm-kernel@...ts.infradead.org, 
 iommu@...ts.linux.dev, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>, 
 Jason Gunthorpe <jgg@...pe.ca>
Subject: [PATCH RFC 0/2] iommu/arm-smmu-v3: bypass streamid zero on i.MX95

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.

Signed-off-by: Peng Fan <peng.fan@....com>
---
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 <peng.fan@....com>