1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * NVIDIA GHES vendor record handler 4 * 5 * Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved. 6 */ 7 8 #include <linux/acpi.h> 9 #include <linux/module.h> 10 #include <linux/platform_device.h> 11 #include <linux/types.h> 12 #include <linux/uuid.h> 13 #include <acpi/ghes.h> 14 15 static const guid_t nvidia_sec_guid = 16 GUID_INIT(0x6d5244f2, 0x2712, 0x11ec, 17 0xbe, 0xa7, 0xcb, 0x3f, 0xdb, 0x95, 0xc7, 0x86); 18 19 struct cper_sec_nvidia { 20 char signature[16]; 21 __le16 error_type; 22 __le16 error_instance; 23 u8 severity; 24 u8 socket; 25 u8 number_regs; 26 u8 reserved; 27 __le64 instance_base; 28 struct { 29 __le64 addr; 30 __le64 val; 31 } regs[] __counted_by(number_regs); 32 }; 33 34 struct nvidia_ghes_private { 35 struct notifier_block nb; 36 struct device *dev; 37 }; 38 39 static void nvidia_ghes_print_error(struct device *dev, 40 const struct cper_sec_nvidia *nvidia_err, 41 size_t error_data_length, bool fatal) 42 { 43 const char *level = fatal ? KERN_ERR : KERN_INFO; 44 size_t min_size; 45 46 dev_printk(level, dev, "signature: %.16s\n", nvidia_err->signature); 47 dev_printk(level, dev, "error_type: %u\n", le16_to_cpu(nvidia_err->error_type)); 48 dev_printk(level, dev, "error_instance: %u\n", le16_to_cpu(nvidia_err->error_instance)); 49 dev_printk(level, dev, "severity: %u\n", nvidia_err->severity); 50 dev_printk(level, dev, "socket: %u\n", nvidia_err->socket); 51 dev_printk(level, dev, "number_regs: %u\n", nvidia_err->number_regs); 52 dev_printk(level, dev, "instance_base: 0x%016llx\n", 53 le64_to_cpu(nvidia_err->instance_base)); 54 55 if (nvidia_err->number_regs == 0) 56 return; 57 58 /* 59 * Validate that all registers fit within error_data_length. 60 * Each register pair is two little-endian u64s. 61 */ 62 min_size = struct_size(nvidia_err, regs, nvidia_err->number_regs); 63 if (error_data_length < min_size) { 64 dev_err(dev, "Invalid number_regs %u (section size %zu, need %zu)\n", 65 nvidia_err->number_regs, error_data_length, min_size); 66 return; 67 } 68 69 for (int i = 0; i < nvidia_err->number_regs; i++) 70 dev_printk(level, dev, "register[%d]: address=0x%016llx value=0x%016llx\n", 71 i, le64_to_cpu(nvidia_err->regs[i].addr), 72 le64_to_cpu(nvidia_err->regs[i].val)); 73 } 74 75 static int nvidia_ghes_notify(struct notifier_block *nb, 76 unsigned long event, void *data) 77 { 78 struct acpi_hest_generic_data *gdata = data; 79 struct nvidia_ghes_private *priv; 80 const struct cper_sec_nvidia *nvidia_err; 81 guid_t sec_guid; 82 83 import_guid(&sec_guid, gdata->section_type); 84 if (!guid_equal(&sec_guid, &nvidia_sec_guid)) 85 return NOTIFY_DONE; 86 87 priv = container_of(nb, struct nvidia_ghes_private, nb); 88 89 if (acpi_hest_get_error_length(gdata) < sizeof(*nvidia_err)) { 90 dev_err(priv->dev, "Section too small (%d < %zu)\n", 91 acpi_hest_get_error_length(gdata), sizeof(*nvidia_err)); 92 return NOTIFY_OK; 93 } 94 95 nvidia_err = acpi_hest_get_payload(gdata); 96 97 if (event >= GHES_SEV_RECOVERABLE) 98 dev_err(priv->dev, "NVIDIA CPER section, error_data_length: %u\n", 99 acpi_hest_get_error_length(gdata)); 100 else 101 dev_info(priv->dev, "NVIDIA CPER section, error_data_length: %u\n", 102 acpi_hest_get_error_length(gdata)); 103 104 nvidia_ghes_print_error(priv->dev, nvidia_err, acpi_hest_get_error_length(gdata), 105 event >= GHES_SEV_RECOVERABLE); 106 107 return NOTIFY_OK; 108 } 109 110 static int nvidia_ghes_probe(struct platform_device *pdev) 111 { 112 struct nvidia_ghes_private *priv; 113 int ret; 114 115 priv = devm_kmalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 116 if (!priv) 117 return -ENOMEM; 118 119 *priv = (struct nvidia_ghes_private) { 120 .nb.notifier_call = nvidia_ghes_notify, 121 .dev = &pdev->dev, 122 }; 123 124 ret = devm_ghes_register_vendor_record_notifier(&pdev->dev, &priv->nb); 125 if (ret) 126 return dev_err_probe(&pdev->dev, ret, 127 "Failed to register NVIDIA GHES vendor record notifier\n"); 128 129 return 0; 130 } 131 132 static const struct acpi_device_id nvidia_ghes_acpi_match[] = { 133 { "NVDA2012" }, 134 { } 135 }; 136 MODULE_DEVICE_TABLE(acpi, nvidia_ghes_acpi_match); 137 138 static struct platform_driver nvidia_ghes_driver = { 139 .driver = { 140 .name = "nvidia-ghes", 141 .acpi_match_table = nvidia_ghes_acpi_match, 142 }, 143 .probe = nvidia_ghes_probe, 144 }; 145 module_platform_driver(nvidia_ghes_driver); 146 147 MODULE_AUTHOR("Kai-Heng Feng <kaihengf@nvidia.com>"); 148 MODULE_DESCRIPTION("NVIDIA GHES vendor CPER record handler"); 149 MODULE_LICENSE("GPL"); 150