linux-kernel - Re: [PATCH 0/2] PCI: Fix ACS enablement for Root Ports in DT platforms

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Message-ID: <20250918141102.GO1326709@ziepe.ca>
Date: Thu, 18 Sep 2025 11:11:02 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: manivannan.sadhasivam@....qualcomm.com
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Joerg Roedel <jroedel@...e.de>, iommu@...ts.linux.dev,
	Anders Roxell <anders.roxell@...aro.org>,
	Naresh Kamboju <naresh.kamboju@...aro.org>,
	Pavankumar Kondeti <quic_pkondeti@...cinc.com>,
	Xingang Wang <wangxingang5@...wei.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>, stable@...r.kernel.org
Subject: Re: [PATCH 0/2] PCI: Fix ACS enablement for Root Ports in DT
 platforms

On Wed, Sep 10, 2025 at 11:09:19PM +0530, Manivannan Sadhasivam via B4 Relay wrote:
> This issue was already found and addressed with a quirk for a different device
> from Microsemi with 'commit, aa667c6408d2 ("PCI: Workaround IDT switch ACS
> Source Validation erratum")'. Apparently, this issue seems to be documented in
> the erratum #36 of IDT 89H32H8G3-YC, which is not publicly available.

This is a pretty broken device! I'm not sure this fix is good enough
though.

For instance if you reset a downstream device it should loose its RID
and then the config cycles waiting for reset to complete will trigger SV
and reset will fail?

Maybe a better answer is to say these switches don't support SV and
prevent the kernel from enabling it in the first place?

Jason