linux-kernel - Re: [PATCH v2 3/4] PCI: Disable ACS SV capability for the broken IDT switches

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Message-ID: <20251202191533.GI812105@ziepe.ca>
Date: Tue, 2 Dec 2025 15:15:33 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	Naresh Kamboju <naresh.kamboju@...aro.org>,
	Pavankumar Kondeti <quic_pkondeti@...cinc.com>,
	Xingang Wang <wangxingang5@...wei.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	Manivannan Sadhasivam <mani@...nel.org>
Subject: Re: [PATCH v2 3/4] PCI: Disable ACS SV capability for the broken IDT
 switches

On Tue, Dec 02, 2025 at 07:52:50PM +0530, Manivannan Sadhasivam wrote:
> @@ -544,6 +544,7 @@ struct pci_dev {
>  #endif
>  	u16		acs_cap;	/* ACS Capability offset */
>  	u16		acs_capabilities; /* ACS Capabilities */
> +	u16		acs_broken_cap; /* Broken ACS Capabilities */

Why do we need this? Have the quirk function accep tthe
acs_capabilities from the register and return the value to program
into struct pci_dev ?

Jason