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Wed, 7 Jun 2023 22:20:47 +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 CY4PEPF0000EE36.mail.protection.outlook.com (10.167.242.42) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6477.13 via Frontend Transport; Wed, 7 Jun 2023 22:20:46 +0000 Received: from ethanolx7ea3host.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 15.1.2375.34; Wed, 7 Jun 2023 17:20:45 -0500 From: Terry Bowman To: , , , , , , , CC: , , , , Mahesh J Salgaonkar , Oliver O'Halloran , Subject: [PATCH v5 20/26] PCI/AER: Refactor cper_print_aer() for use by CXL driver module Date: Wed, 7 Jun 2023 17:16:45 -0500 Message-ID: <20230607221651.2454764-21-terry.bowman@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230607221651.2454764-1-terry.bowman@amd.com> References: <20230607221651.2454764-1-terry.bowman@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: CY4PEPF0000EE36:EE_|IA1PR12MB6209:EE_ X-MS-Office365-Filtering-Correlation-Id: 61083b95-5bfb-40e2-0e9b-08db67a5712a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jun 2023 22:20:46.7809 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 61083b95-5bfb-40e2-0e9b-08db67a5712a 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: CY4PEPF0000EE36.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6209 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The CXL driver plans to use cper_print_aer() for logging restricted CXL host (RCH) AER errors. cper_print_aer() is not currently exported and therefore not usable by the CXL drivers built as loadable modules. Export the cper_print_aer() function. Use the EXPORT_SYMBOL_NS_GPL() variant to restrict the export to CXL drivers. The CONFIG_ACPI_APEI_PCIEAER kernel config is currently used to enable cper_print_aer(). cper_print_aer() logs the AER registers and is useful in PCIE AER logging outside of APEI. Remove the CONFIG_ACPI_APEI_PCIEAER dependency to enable cper_print_aer(). The cper_print_aer() function name implies CPER specific use but is useful in non-CPER cases as well. Rename cper_print_aer() to pci_print_aer(). Co-developed-by: Robert Richter Signed-off-by: Robert Richter Signed-off-by: Terry Bowman Cc: Mahesh J Salgaonkar Cc: "Oliver O'Halloran" Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Reviewed-by: Jonathan Cameron Acked-by: Bjorn Helgaas --- drivers/pci/pcie/aer.c | 9 +++++---- include/linux/aer.h | 2 +- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index f6c24ded134c..d3344fcf1f79 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -771,9 +771,10 @@ int cper_severity_to_aer(int cper_severity) } } EXPORT_SYMBOL_GPL(cper_severity_to_aer); +#endif -void cper_print_aer(struct pci_dev *dev, int aer_severity, - struct aer_capability_regs *aer) +void pci_print_aer(struct pci_dev *dev, int aer_severity, + struct aer_capability_regs *aer) { int layer, agent, tlp_header_valid = 0; u32 status, mask; @@ -812,7 +813,7 @@ void cper_print_aer(struct pci_dev *dev, int aer_severity, trace_aer_event(dev_name(&dev->dev), (status & ~mask), aer_severity, tlp_header_valid, &aer->header_log); } -#endif +EXPORT_SYMBOL_NS_GPL(pci_print_aer, CXL); /** * add_error_device - list device to be handled @@ -1009,7 +1010,7 @@ static void aer_recover_work_func(struct work_struct *work) PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn)); continue; } - cper_print_aer(pdev, entry.severity, entry.regs); + pci_print_aer(pdev, entry.severity, entry.regs); if (entry.severity == AER_NONFATAL) pcie_do_recovery(pdev, pci_channel_io_normal, aer_root_reset); diff --git a/include/linux/aer.h b/include/linux/aer.h index 97f64ba1b34a..8f124b904314 100644 --- a/include/linux/aer.h +++ b/include/linux/aer.h @@ -64,7 +64,7 @@ static inline void pci_save_aer_state(struct pci_dev *dev) {} static inline void pci_restore_aer_state(struct pci_dev *dev) {} #endif -void cper_print_aer(struct pci_dev *dev, int aer_severity, +void pci_print_aer(struct pci_dev *dev, int aer_severity, struct aer_capability_regs *aer); int cper_severity_to_aer(int cper_severity); void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn, From patchwork Wed Jun 7 22:16:50 2023 Content-Type: text/plain; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jun 2023 22:21:41.1913 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e35fd94b-ebb0-4a6f-0944-08db67a59196 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: CY4PEPF0000EE33.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6733 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Robert Richter In Restricted CXL Device (RCD) mode a CXL device is exposed as an RCiEP, but CXL downstream and upstream ports are not enumerated and not visible in the PCIe hierarchy. [1] Protocol and link errors from these non-enumerated ports are signaled as internal AER errors, either Uncorrectable Internal Error (UIE) or Corrected Internal Errors (CIE) via an RCEC. Restricted CXL host (RCH) downstream port-detected errors have the Requster ID of the RCEC set in the RCEC's AER Error Source ID register. A CXL handler must then inspect the error status in various CXL registers residing in the dport's component register space (CXL RAS capability) or the dport's RCRB (PCIe AER extended capability). [2] Errors showing up in the RCEC's error handler must be handled and connected to the CXL subsystem. Implement this by forwarding the error to all CXL devices below the RCEC. Since the entire CXL device is controlled only using PCIe Configuration Space of device 0, function 0, only pass it there [3]. The error handling is limited to currently supported devices with the Memory Device class code set (CXL Type 3 Device, PCI_CLASS_MEMORY_CXL, 502h), handle downstream port errors in the device's cxl_pci driver. Support for other CXL Device Types (e.g. a CXL.cache Device) can be added later. To handle downstream port errors in addition to errors directed to the CXL endpoint device, a handler must also inspect the CXL RAS and PCIe AER capabilities of the CXL downstream port the device is connected to. Since CXL downstream port errors are signaled using internal errors, the handler requires those errors to be unmasked. This is subject of a follow-on patch. The reason for choosing this implementation is that the AER service driver claims the RCEC device, but does not allow it to register a custom specific handler to support CXL. Connecting the RCEC hard-wired with a CXL handler does not work, as the CXL subsystem might not be present all the time. The alternative to add an implementation to the portdrv to allow the registration of a custom RCEC error handler isn't worth doing it as CXL would be its only user. Instead, just check for an CXL RCEC and pass it down to the connected CXL device's error handler. With this approach the code can entirely be implemented in the PCIe AER driver and is independent of the CXL subsystem. The CXL driver only provides the handler. [1] CXL 3.0 spec: 9.11.8 CXL Devices Attached to an RCH [2] CXL 3.0 spec, 12.2.1.1 RCH Downstream Port-detected Errors [3] CXL 3.0 spec, 8.1.3 PCIe DVSEC for CXL Devices Co-developed-by: Terry Bowman Signed-off-by: Terry Bowman Signed-off-by: Robert Richter Cc: "Oliver O'Halloran" Cc: Bjorn Helgaas Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-pci@vger.kernel.org Acked-by: Bjorn Helgaas Reviewed-by: Jonathan Cameron --- drivers/pci/pcie/Kconfig | 12 +++++ drivers/pci/pcie/aer.c | 96 +++++++++++++++++++++++++++++++++++++++- 2 files changed, 106 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pcie/Kconfig b/drivers/pci/pcie/Kconfig index 228652a59f27..4f0e70fafe2d 100644 --- a/drivers/pci/pcie/Kconfig +++ b/drivers/pci/pcie/Kconfig @@ -49,6 +49,18 @@ config PCIEAER_INJECT gotten from: https://git.kernel.org/cgit/linux/kernel/git/gong.chen/aer-inject.git/ +config PCIEAER_CXL + bool "PCI Express CXL RAS support for Restricted Hosts (RCH)" + default y + depends on PCIEAER && CXL_PCI + help + Enables error handling of downstream ports of a CXL host + that is operating in RCD mode (Restricted CXL Host, RCH). + The downstream port reports AER errors to a given RCEC. + Errors are handled by the CXL memory device driver. + + If unsure, say Y. + # # PCI Express ECRC # diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index d3344fcf1f79..c354ca5e8f2b 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -946,14 +946,100 @@ static bool find_source_device(struct pci_dev *parent, return true; } +#ifdef CONFIG_PCIEAER_CXL + +static bool is_cxl_mem_dev(struct pci_dev *dev) +{ + /* + * The capability, status, and control fields in Device 0, + * Function 0 DVSEC control the CXL functionality of the + * entire device (CXL 3.0, 8.1.3). + */ + if (dev->devfn != PCI_DEVFN(0, 0)) + return false; + + /* + * CXL Memory Devices must have the 502h class code set (CXL + * 3.0, 8.1.12.1). + */ + if ((dev->class >> 8) != PCI_CLASS_MEMORY_CXL) + return false; + + return true; +} + +static bool cxl_error_is_native(struct pci_dev *dev) +{ + struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); + + if (pcie_ports_native) + return true; + + return host->native_aer && host->native_cxl_error; +} + +static bool is_internal_error(struct aer_err_info *info) +{ + if (info->severity == AER_CORRECTABLE) + return info->status & PCI_ERR_COR_INTERNAL; + + return info->status & PCI_ERR_UNC_INTN; +} + +static int cxl_rch_handle_error_iter(struct pci_dev *dev, void *data) +{ + struct aer_err_info *info = (struct aer_err_info *)data; + const struct pci_error_handlers *err_handler; + + if (!is_cxl_mem_dev(dev) || !cxl_error_is_native(dev)) + return 0; + + /* protect dev->driver */ + device_lock(&dev->dev); + + err_handler = dev->driver ? dev->driver->err_handler : NULL; + if (!err_handler) + goto out; + + if (info->severity == AER_CORRECTABLE) { + if (err_handler->cor_error_detected) + err_handler->cor_error_detected(dev); + } else if (err_handler->error_detected) { + if (info->severity == AER_NONFATAL) + err_handler->error_detected(dev, pci_channel_io_normal); + else if (info->severity == AER_FATAL) + err_handler->error_detected(dev, pci_channel_io_frozen); + } +out: + device_unlock(&dev->dev); + return 0; +} + +static void cxl_rch_handle_error(struct pci_dev *dev, struct aer_err_info *info) +{ + /* + * Internal errors of an RCEC indicate an AER error in an + * RCH's downstream port. Check and handle them in the CXL.mem + * device driver. + */ + if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC && + is_internal_error(info)) + pcie_walk_rcec(dev, cxl_rch_handle_error_iter, info); +} + +#else +static inline void cxl_rch_handle_error(struct pci_dev *dev, + struct aer_err_info *info) { } +#endif + /** - * handle_error_source - handle logging error into an event log + * pci_aer_handle_error - handle logging error into an event log * @dev: pointer to pci_dev data structure of error source device * @info: comprehensive error information * * Invoked when an error being detected by Root Port. */ -static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info) +static void pci_aer_handle_error(struct pci_dev *dev, struct aer_err_info *info) { int aer = dev->aer_cap; @@ -977,6 +1063,12 @@ static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info) pcie_do_recovery(dev, pci_channel_io_normal, aer_root_reset); else if (info->severity == AER_FATAL) pcie_do_recovery(dev, pci_channel_io_frozen, aer_root_reset); +} + +static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info) +{ + cxl_rch_handle_error(dev, info); + pci_aer_handle_error(dev, info); pci_dev_put(dev); }