From: Jason Gunthorpe <jgg@ziepe.ca>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Nicolin Chen <nicolinc@nvidia.com>,
Peng Fan <peng.fan@oss.nxp.com>, Will Deacon <will@kernel.org>,
"Joerg Roedel (AMD)" <joro@8bytes.org>,
Jean-Philippe Brucker <jpb@kernel.org>,
Thierry Reding <thierry.reding@kernel.org>,
Krishna Reddy <vdumpa@nvidia.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org,
Peng Fan <peng.fan@nxp.com>
Subject: Re: [PATCH RFC v6 5/5] iommu/arm-smmu-v3: Wire up shared-SID STE ordering and feature gating
Date: Tue, 13 Oct 2026 09:44:00 -0300 [thread overview]
Message-ID: <20261013124400.GI14213@ziepe.ca> (raw)
In-Reply-To: <e8c22eb2-ed1f-47c7-b2ac-c56ead1cba8b@arm.com>
On Tue, Oct 13, 2026 at 12:22:06PM +0100, Robin Murphy wrote:
> If we're not going to support PASID for shared streams (which I suggest we
> don't...) than we shouldn't strictly need to worry about CD tables anyway.
> So rather than having to special-case CD table sharing for shared streams,
> perhaps it might make sense to generalise back to a "default" per-domain CD
> for non-PASID use, which can then get switched for the private per-stream
> cd_table if and when a device does enable PASID?
If we have stared STEs then the group becomes the per-STE data
structure not the master.. We don't have any way right now to do that,
but it would make some sense for the group to store the shared CD
Jason
prev parent reply other threads:[~2026-10-13 12:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-11 11:31 [PATCH RFC v6 0/5] iommu/arm-smmu-v3: Support shared Stream IDs Peng Fan (OSS)
2026-10-11 11:31 ` [PATCH RFC v6 1/5] iommu/arm-smmu-v3: Allocate streams individually Peng Fan (OSS)
2026-10-11 11:31 ` [PATCH RFC v6 2/5] iommu/arm-smmu-v3: Delay stream allocation to inside the mutex Peng Fan (OSS)
2026-10-12 20:36 ` Nicolin Chen
2026-10-11 11:31 ` [PATCH RFC v6 3/5] iommu/arm-smmu-v3: Support shared SIDs in insert/remove_master Peng Fan (OSS)
2026-10-12 20:48 ` Nicolin Chen
2026-10-11 11:31 ` [PATCH RFC v6 4/5] iommu/arm-smmu-v3: Group aliasing devices into the same IOMMU group Peng Fan (OSS)
2026-10-12 12:24 ` Peng Fan
2026-10-12 13:05 ` Robin Murphy
2026-10-11 11:31 ` [PATCH RFC v6 5/5] iommu/arm-smmu-v3: Wire up shared-SID STE ordering and feature gating Peng Fan (OSS)
2026-10-12 13:23 ` Peng Fan
2026-10-12 23:54 ` Nicolin Chen
2026-10-13 11:22 ` Robin Murphy
2026-10-13 12:44 ` Jason Gunthorpe [this message]
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