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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SN1PEPF000252A4.mail.protection.outlook.com (10.167.242.11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7292.25 via Frontend Transport; Tue, 20 Feb 2024 22:13:12 +0000 Received: from bcheatha-HP-EliteBook-845-G8-Notebook-PC.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 20 Feb 2024 16:13:07 -0600 From: Ben Cheatham To: , , , , , CC: , , , , , , , Subject: [PATCH v13 4/4] EINJ, Documentation: Update EINJ kernel doc Date: Tue, 20 Feb 2024 16:11:46 -0600 Message-ID: <20240220221146.399209-5-Benjamin.Cheatham@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240220221146.399209-1-Benjamin.Cheatham@amd.com> References: <20240220221146.399209-1-Benjamin.Cheatham@amd.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF000252A4:EE_|IA0PR12MB8352:EE_ X-MS-Office365-Filtering-Correlation-Id: 8ed64091-f0be-4990-9c7a-08dc3261212e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF000252A4.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8352 Update EINJ kernel document to include how to inject CXL protocol error types, build the kernel to include CXL error types, and give an example injection. Signed-off-by: Ben Cheatham --- .../firmware-guide/acpi/apei/einj.rst | 21 +++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/Documentation/firmware-guide/acpi/apei/einj.rst b/Documentation/firmware-guide/acpi/apei/einj.rst index d6b61d22f525..23741ec0de75 100644 --- a/Documentation/firmware-guide/acpi/apei/einj.rst +++ b/Documentation/firmware-guide/acpi/apei/einj.rst @@ -181,6 +181,27 @@ You should see something like this in dmesg:: [22715.834759] EDAC sbridge MC3: PROCESSOR 0:306e7 TIME 1422553404 SOCKET 0 APIC 0 [22716.616173] EDAC MC3: 1 CE memory read error on CPU_SrcID#0_Channel#0_DIMM#0 (channel:0 slot:0 page:0x12345 offset:0x0 grain:32 syndrome:0x0 - area:DRAM err_code:0001:0090 socket:0 channel_mask:1 rank:0) +CXL error types are supported from ACPI 6.5 onwards (given a CXL port +is present). These error types are not available in the legacy interface +at /sys/kernel/debug/apei/einj, and are instead at /sys/kernel/debug/cxl/. +There is a file under debug/cxl called "einj_type" that is analogous to +available_error_type under debug/cxl. There is also a "einj_inject" file +in each $dport_dev directory under debug/cxl that will inject a given error +into the dport represented by $dport_dev. + +For example, to inject a CXL.mem protocol correctable error into +$dport_dev=pci0000:0c:: + + # cd /sys/kernel/debug/cxl/ + # cat einj_type # See which error can be injected + 0x00008000 CXL.mem Protocol Correctable + 0x00010000 CXL.mem Protocol Uncorrectable non-fatal + 0x00020000 CXL.mem Protocol Uncorrectable fatal + # cd 0000:e0:01.1 # Navigate to dport to inject into + # echo 0x8000 > einj_inject # Inject error + +To use CXL error types, ``CONFIG_ACPI_APEI_CXL_EINJ`` will need to be enabled. + Special notes for injection into SGX enclaves: There may be a separate BIOS setup option to enable SGX injection.