From: Nicolin Chen <nicolinc@nvidia.com>
To: Peng Fan <peng.fan@oss.nxp.com>
Cc: Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
"Joerg Roedel (AMD)" <joro@8bytes.org>,
Jason Gunthorpe <jgg@ziepe.ca>,
Jean-Philippe Brucker <jpb@kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <iommu@lists.linux.dev>,
<linux-kernel@vger.kernel.org>, Peng Fan <peng.fan@nxp.com>
Subject: Re: [PATCH RFC v4 2/4] iommu/arm-smmu-v3: Support shared SIDs in insert/remove_master
Date: Fri, 2 Oct 2026 09:56:30 -0700 [thread overview]
Message-ID: <ar/iPpHX2FJ4UswZ@nvidia.com> (raw)
In-Reply-To: <ar+HLlB2oyiz/cgD@shlinux89>
On Fri, Oct 02, 2026 at 06:27:58PM +0800, Peng Fan wrote:
> Ah. So I need a patch list saying:
> 1. iommu/arm-smmu-v3: Allocate streams individually. Change master->streams
> from an embedded array of struct arm_smmu_stream to an array of pointers,
> with each stream individually allocated, to prepare for shared-SID support
> where multiple masters will point to the same stream object
> 2. iommu/arm-smmu-v3: Support shared SIDs in insert/remove_master
> 3. iommu/arm-smmu-v3: Group aliasing devices into the same IOMMU group
> 4. iommu/arm-smmu-v3: Wire up shared-SID STE ordering and feature gating
That looks right to me.
Please also check Sashiko findings:
https://sashiko.dev/#/patchset/20261001-smmu-shared-sid-ver3-v4-0-06b34fb2e691%40nxp.com
Some of them should be gone once you fix the out-of-sync issue.
But findings like lockings would still remain.
Nicolin
next prev parent reply other threads:[~2026-10-02 16:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-01 12:49 [PATCH RFC v4 0/4] iommu/arm-smmu-v3: Support shared Stream IDs Peng Fan (OSS)
2026-10-01 12:49 ` [PATCH RFC v4 1/4] iommu/arm-smmu-v3: Skip duplicate SIDs when erasing streams from RB tree Peng Fan (OSS)
2026-10-01 16:07 ` Nicolin Chen
2026-10-02 10:19 ` Peng Fan
2026-10-01 12:49 ` [PATCH RFC v4 2/4] iommu/arm-smmu-v3: Support shared SIDs in insert/remove_master Peng Fan (OSS)
2026-10-01 17:17 ` Nicolin Chen
2026-10-02 10:27 ` Peng Fan
2026-10-02 16:56 ` Nicolin Chen [this message]
2026-10-01 12:50 ` [PATCH RFC v4 3/4] iommu/arm-smmu-v3: Group aliasing devices into the same IOMMU group Peng Fan (OSS)
2026-10-01 12:50 ` [PATCH RFC v4 4/4] iommu/arm-smmu-v3: Wire up shared-SID STE ordering and feature gating Peng Fan (OSS)
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