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Thu, 7 Sep 2023 19:21:06 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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 SN1PEPF0002636B.mail.protection.outlook.com (10.167.241.136) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6768.25 via Frontend Transport; Thu, 7 Sep 2023 19:21:06 +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 15.1.2507.27; Thu, 7 Sep 2023 14:21:05 -0500 From: Ben Cheatham To: , , , CC: , , Subject: [PATCH v4 2/3] ACPI, APEI, EINJ: Add CXL 1.1 EINJ error type support Date: Thu, 7 Sep 2023 14:19:55 -0500 Message-ID: <20230907191956.674833-3-Benjamin.Cheatham@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230907191956.674833-1-Benjamin.Cheatham@amd.com> References: <20230907191956.674833-1-Benjamin.Cheatham@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002636B:EE_|CH2PR12MB4892:EE_ X-MS-Office365-Filtering-Correlation-Id: d45ce91b-4098-421e-eb86-08dbafd79579 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Sep 2023 19:21:06.3056 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d45ce91b-4098-421e-eb86-08dbafd79579 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002636B.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4892 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Add support for CXL EINJ error types for CXL 1.1 hosts added in ACPI v6.5. Because these error types target memory-mapped CXL 1.1 compliant downstream ports and not physical (normal/persistent) memory, these error types are not currently allowed through the memory range validation done by the EINJ driver. The MMIO address of a CXL 1.1 downstream port can be found in the cxl_rcrb_addr file in the corresponding dport directory under /sys/bus/cxl/devices/portX. CXL 1.1 error types follow the same procedure as a memory error type, but with param1 set to the downstream port MMIO address. Example usage: $ cd /sys/kernel/debug/apei/einj $ cat available_error_type 0x00000008 Memory Correctable 0x00000010 Memory Uncorrectable non-fatal 0x00000020 Memory Uncorrectable fatal 0x00000040 PCI Express Correctable 0x00000080 PCI Express Uncorrectable non-fatal 0x00000100 PCI Express Uncorrectable fatal 0x00008000 CXL.mem Protocol Correctable 0x00020000 CXL.mem Protocol Uncorrectable fatal $ echo 0x8000 > error_type $ echo 0xfffffffffffff000 > param2 $ echo 0x3 > flags $ cat /sys/bus/cxl/devices/portX/dportY/cxl_rcrb_addr 0xb2f00000 $ echo 0xb2f00000 > param1 $ echo 1 > error_inject Signed-off-by: Ben Cheatham --- drivers/acpi/apei/Kconfig | 2 ++ drivers/acpi/apei/einj.c | 24 +++++++++++++++++++++++- drivers/cxl/core/port.c | 19 +++++++++++++++++++ drivers/cxl/cxl.h | 1 + include/linux/cxl.h | 18 ++++++++++++++++++ 5 files changed, 63 insertions(+), 1 deletion(-) create mode 100644 include/linux/cxl.h diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig index 6b18f8bc7be3..eb9cc7157342 100644 --- a/drivers/acpi/apei/Kconfig +++ b/drivers/acpi/apei/Kconfig @@ -55,6 +55,8 @@ config ACPI_APEI_MEMORY_FAILURE config ACPI_APEI_EINJ tristate "APEI Error INJection (EINJ)" depends on ACPI_APEI && DEBUG_FS + imply CXL_BUS + imply CXL_ACPI help EINJ provides a hardware error injection mechanism, it is mainly used for debugging and testing the other parts of diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c index 013eb621dc92..8000417a5f26 100644 --- a/drivers/acpi/apei/einj.c +++ b/drivers/acpi/apei/einj.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include "apei-internal.h" @@ -36,6 +37,7 @@ #define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \ ACPI_EINJ_MEMORY_UNCORRECTABLE | \ ACPI_EINJ_MEMORY_FATAL) +#define CXL_ERROR_MASK GENMASK(17, 12) /* * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action. @@ -512,6 +514,22 @@ static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, return rc; } +static int is_valid_cxl_addr(u64 addr) +{ + struct cxl_dport *dport; + + if (IS_REACHABLE(CONFIG_CXL_ACPI)) + dport = cxl_find_rch_dport_by_rcrb((resource_size_t) addr); + else + return 0; + + if (!IS_ERR_OR_NULL(dport)) + return 1; + + pr_info("Could not find dport with rcrb 0x%llx\n", addr); + return 0; +} + /* Inject the specified hardware error */ static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, u64 param3, u64 param4) @@ -537,8 +555,11 @@ static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, if (type & ACPI5_VENDOR_BIT) { if (vendor_flags != SETWA_FLAGS_MEM) goto inject; - } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM)) + } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM)) { goto inject; + } else if (type & CXL_ERROR_MASK && is_valid_cxl_addr(param1)) { + goto inject; + } /* * Disallow crazy address masks that give BIOS leeway to pick @@ -807,3 +828,4 @@ module_exit(einj_exit); MODULE_AUTHOR("Huang Ying"); MODULE_DESCRIPTION("APEI Error INJection support"); MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(CXL); diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 001ab8742e21..f8f300496140 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -1122,6 +1122,25 @@ struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port, } EXPORT_SYMBOL_NS_GPL(devm_cxl_add_rch_dport, CXL); +#if IS_ENABLED(CONFIG_CXL_ACPI) +struct cxl_dport *cxl_find_rch_dport_by_rcrb(resource_size_t rcrb_base) +{ + struct cxl_dport *dport; + unsigned long index; + + if (!cxl_root) + return ERR_PTR(-ENODEV); + + xa_for_each(&cxl_root->dports, index, dport) + if ((dport->rch && dport->rcrb.base != CXL_RESOURCE_NONE) + && dport->rcrb.base == rcrb_base) + return dport; + + return NULL; +} +EXPORT_SYMBOL_NS_GPL(cxl_find_rch_dport_by_rcrb, CXL); +#endif + static int add_ep(struct cxl_ep *new) { struct cxl_port *port = new->dport->port; diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 4d5bce4bae7e..3e6779dbcd23 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -8,6 +8,7 @@ #include #include #include +#include #include /** diff --git a/include/linux/cxl.h b/include/linux/cxl.h new file mode 100644 index 000000000000..b57a4cc85005 --- /dev/null +++ b/include/linux/cxl.h @@ -0,0 +1,18 @@ +#ifndef _LINUX_CXL_H +#define _LINUX_CXL_H + +#include +#include + +struct cxl_dport; + +#if IS_ENABLED(CONFIG_CXL_ACPI) +struct cxl_dport *cxl_find_rch_dport_by_rcrb(resource_size_t rcrb_base); +#else +static inline struct cxl_dport *cxl_find_rch_dport_by_rcrb(resource_size_t rcrb_base) +{ + return NULL; +} +#endif + +#endif