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
nvidia_ghes_print_error(struct device * dev,const struct cper_sec_nvidia * nvidia_err,size_t error_data_length,bool fatal)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
nvidia_ghes_notify(struct notifier_block * nb,unsigned long event,void * data)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
nvidia_ghes_probe(struct platform_device * pdev)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