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[47.55.120.4]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-88652b91ba3sm110766546d6.53.2025.12.02.11.15.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Dec 2025 11:15:34 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vQVqX-00000004tAz-3gdk; Tue, 02 Dec 2025 15:15:33 -0400 Date: Tue, 2 Dec 2025 15:15:33 -0400 From: Jason Gunthorpe To: Manivannan Sadhasivam Cc: Bjorn Helgaas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, Naresh Kamboju , Pavankumar Kondeti , Xingang Wang , Marek Szyprowski , Robin Murphy , Manivannan Sadhasivam Subject: Re: [PATCH v2 3/4] PCI: Disable ACS SV capability for the broken IDT switches Message-ID: <20251202191533.GI812105@ziepe.ca> References: <20251202-pci_acs-v2-0-5d2759a71489@oss.qualcomm.com> <20251202-pci_acs-v2-3-5d2759a71489@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251202-pci_acs-v2-3-5d2759a71489@oss.qualcomm.com> 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