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Fri, 6 Mar 2026 01:24:02 -0800 From: To: , , , , , , , CC: , , , , , , , , , , , , , , "Srirangan Madhavan" Subject: [PATCH v5 7/7] Documentation: ABI: Add CXL PCI cxl_reset sysfs attribute Date: Fri, 6 Mar 2026 09:23:22 +0000 Message-ID: <20260306092322.148765-8-smadhavan@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260306092322.148765-1-smadhavan@nvidia.com> References: <20260306092322.148765-1-smadhavan@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF0000449D:EE_|SA0PR12MB4430:EE_ X-MS-Office365-Filtering-Correlation-Id: 4339fc4c-779a-4c6a-80c1-08de7b622adc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|7416014|13003099007; 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charset="utf-8" From: Srirangan Madhavan Document the cxl_reset sysfs attribute added to PCI devices that support CXL Reset. Signed-off-by: Srirangan Madhavan --- Documentation/ABI/testing/sysfs-bus-pci | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/te= sting/sysfs-bus-pci index b767db2c52cb..d67c733626b8 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -174,6 +174,28 @@ Description: similiar to writing 1 to their individual "reset" file, so use with caution. +What: /sys/bus/pci/devices/.../cxl_reset +Date: February 2026 +Contact: linux-cxl@vger.kernel.org +Description: + This attribute is only visible when the device advertises + CXL Reset Capable in the CXL DVSEC Capability register + (CXL r3.2, section 8.1.3). + + Writing 1 to this file triggers a CXL device reset which + affects CXL.cache and CXL.mem state on all CXL functions + (i.e. those not listed in the Non-CXL Function Map DVSEC, + section 8.1.4), not just CXL.io/PCIe state. This is + separate from the standard PCI reset interface because CXL + Reset has different scope. + + The reset will fail with -EBUSY if any CXL regions using this + device have drivers bound. Active regions are torn down as + part of the reset sequence. + + This attribute is registered by the CXL core when a CXL device + is discovered, independent of which driver binds the PCI device. + What: /sys/bus/pci/devices/.../vpd Date: February 2008 Contact: Ben Hutchings -- 2.43.0