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

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Message-ID: <20250923162139.GC2547959@ziepe.ca>
Date: Tue, 23 Sep 2025 13:21:39 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Manivannan Sadhasivam <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 Tue, Sep 23, 2025 at 09:07:49PM +0530, Manivannan Sadhasivam wrote:
> On Thu, Sep 18, 2025 at 11:11:02AM -0300, Jason Gunthorpe wrote:
> > 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?
> > 
> 
> No. Resetting the Ethernet controller connected to the switch downstream port
> doesn't fail and we could see that the reset succeeds.

Reset it by up/down the PCI link?

> Maybe the bus number was still captured by the device.

Maybe, but I don't think that is spec conformat behavior.

Jason