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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Nov 2025 17:05:58.8169 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7eab398f-8773-4b30-bf72-08de1bc46cf3 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB74.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7711 Content-Type: text/plain; charset="utf-8" The CXL driver's error handling for uncorrectable errors (UCE) will be updated in the future. A required change is for the error handlers to to force a system panic when a UCE is detected. Introduce PCI_ERS_RESULT_PANIC as a 'enum pci_ers_result' type. This will be used by CXL UCE fatal and non-fatal recovery in future patches. Update PCIe recovery documentation with details of PCI_ERS_RESULT_PANIC. Signed-off-by: Terry Bowman Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Reviewed-by: Ben Cheatham Reviewed-by: Dan Williams --- Changes in v12->v13: - Add Dave Jiang's, Jonathan's, Ben's review-by - Typo fix (Ben) Changes v11 -> v12: - Documentation requested (Lukas) --- Documentation/PCI/pci-error-recovery.rst | 6 ++++++ include/linux/pci.h | 3 +++ 2 files changed, 9 insertions(+) diff --git a/Documentation/PCI/pci-error-recovery.rst b/Documentation/PCI/p= ci-error-recovery.rst index 5df481ac6193..83505a585116 100644 --- a/Documentation/PCI/pci-error-recovery.rst +++ b/Documentation/PCI/pci-error-recovery.rst @@ -102,6 +102,8 @@ Possible return values are:: PCI_ERS_RESULT_NEED_RESET, /* Device driver wants slot to be reset. */ PCI_ERS_RESULT_DISCONNECT, /* Device has completely failed, is unrecove= rable */ PCI_ERS_RESULT_RECOVERED, /* Device driver is fully recovered and oper= ational */ + PCI_ERS_RESULT_NO_AER_DRIVER, /* No AER capabilities registered for the = driver */ + PCI_ERS_RESULT_PANIC, /* System is unstable, panic. Is CXL specifi= c */ }; =20 A driver does not have to implement all of these callbacks; however, @@ -116,6 +118,10 @@ The actual steps taken by a platform to recover from a= PCI error event will be platform-dependent, but will follow the general sequence described below. =20 +PCI_ERS_RESULT_PANIC is currently unique to CXL and handled in CXL +cxl_do_recovery(). The PCI pcie_do_recovery() routine does not report or +handle PCI_ERS_RESULT_PANIC. + STEP 0: Error Event ------------------- A PCI bus error is detected by the PCI hardware. On powerpc, the slot diff --git a/include/linux/pci.h b/include/linux/pci.h index 5c4759078d2f..cffa5535f28d 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -890,6 +890,9 @@ enum pci_ers_result { =20 /* No AER capabilities registered for the driver */ PCI_ERS_RESULT_NO_AER_DRIVER =3D (__force pci_ers_result_t) 6, + + /* System is unstable, panic. Is CXL specific */ + PCI_ERS_RESULT_PANIC =3D (__force pci_ers_result_t) 7, }; =20 /* PCI bus error event callbacks */ --=20 2.34.1