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26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/acpi.h>
30#include <linux/kdebug.h>
31#include <linux/highmem.h>
32#include <linux/io.h>
33#include <linux/platform_device.h>
34#include <acpi/apei.h>
35
36#include "apei-internal.h"
37
38#define HEST_PFX "HEST: "
39
40int hest_disable;
41EXPORT_SYMBOL_GPL(hest_disable);
42
43
44
45static struct acpi_table_hest *__read_mostly hest_tab;
46
47static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
48 [ACPI_HEST_TYPE_IA32_CHECK] = -1,
49 [ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
50 [ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
51 [ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
52 [ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
53 [ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
54 [ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
55 [ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
56};
57
58static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
59{
60 u16 hest_type = hest_hdr->type;
61 int len;
62
63 if (hest_type >= ACPI_HEST_TYPE_RESERVED)
64 return 0;
65
66 len = hest_esrc_len_tab[hest_type];
67
68 if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
69 struct acpi_hest_ia_corrected *cmc;
70 cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
71 len = sizeof(*cmc) + cmc->num_hardware_banks *
72 sizeof(struct acpi_hest_ia_error_bank);
73 } else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
74 struct acpi_hest_ia_machine_check *mc;
75 mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
76 len = sizeof(*mc) + mc->num_hardware_banks *
77 sizeof(struct acpi_hest_ia_error_bank);
78 }
79 BUG_ON(len == -1);
80
81 return len;
82};
83
84int apei_hest_parse(apei_hest_func_t func, void *data)
85{
86 struct acpi_hest_header *hest_hdr;
87 int i, rc, len;
88
89 if (hest_disable || !hest_tab)
90 return -EINVAL;
91
92 hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
93 for (i = 0; i < hest_tab->error_source_count; i++) {
94 len = hest_esrc_len(hest_hdr);
95 if (!len) {
96 pr_warning(FW_WARN HEST_PFX
97 "Unknown or unused hardware error source "
98 "type: %d for hardware error source: %d.\n",
99 hest_hdr->type, hest_hdr->source_id);
100 return -EINVAL;
101 }
102 if ((void *)hest_hdr + len >
103 (void *)hest_tab + hest_tab->header.length) {
104 pr_warning(FW_BUG HEST_PFX
105 "Table contents overflow for hardware error source: %d.\n",
106 hest_hdr->source_id);
107 return -EINVAL;
108 }
109
110 rc = func(hest_hdr, data);
111 if (rc)
112 return rc;
113
114 hest_hdr = (void *)hest_hdr + len;
115 }
116
117 return 0;
118}
119EXPORT_SYMBOL_GPL(apei_hest_parse);
120
121
122
123
124
125static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
126{
127 if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
128 return 0;
129
130 if (!acpi_disable_cmcff)
131 return !arch_apei_enable_cmcff(hest_hdr, data);
132
133 return 0;
134}
135
136struct ghes_arr {
137 struct platform_device **ghes_devs;
138 unsigned int count;
139};
140
141static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
142{
143 int *count = data;
144
145 if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
146 hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
147 (*count)++;
148 return 0;
149}
150
151static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
152{
153 struct platform_device *ghes_dev;
154 struct ghes_arr *ghes_arr = data;
155 int rc, i;
156
157 if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
158 hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
159 return 0;
160
161 if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
162 return 0;
163 for (i = 0; i < ghes_arr->count; i++) {
164 struct acpi_hest_header *hdr;
165 ghes_dev = ghes_arr->ghes_devs[i];
166 hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
167 if (hdr->source_id == hest_hdr->source_id) {
168 pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
169 hdr->source_id);
170 return -EIO;
171 }
172 }
173 ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
174 if (!ghes_dev)
175 return -ENOMEM;
176
177 rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
178 if (rc)
179 goto err;
180
181 rc = platform_device_add(ghes_dev);
182 if (rc)
183 goto err;
184 ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
185
186 return 0;
187err:
188 platform_device_put(ghes_dev);
189 return rc;
190}
191
192static int __init hest_ghes_dev_register(unsigned int ghes_count)
193{
194 int rc, i;
195 struct ghes_arr ghes_arr;
196
197 ghes_arr.count = 0;
198 ghes_arr.ghes_devs = kmalloc(sizeof(void *) * ghes_count, GFP_KERNEL);
199 if (!ghes_arr.ghes_devs)
200 return -ENOMEM;
201
202 rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
203 if (rc)
204 goto err;
205out:
206 kfree(ghes_arr.ghes_devs);
207 return rc;
208err:
209 for (i = 0; i < ghes_arr.count; i++)
210 platform_device_unregister(ghes_arr.ghes_devs[i]);
211 goto out;
212}
213
214static int __init setup_hest_disable(char *str)
215{
216 hest_disable = HEST_DISABLED;
217 return 0;
218}
219
220__setup("hest_disable", setup_hest_disable);
221
222void __init acpi_hest_init(void)
223{
224 acpi_status status;
225 int rc = -ENODEV;
226 unsigned int ghes_count = 0;
227
228 if (hest_disable) {
229 pr_info(HEST_PFX "Table parsing disabled.\n");
230 return;
231 }
232
233 status = acpi_get_table(ACPI_SIG_HEST, 0,
234 (struct acpi_table_header **)&hest_tab);
235 if (status == AE_NOT_FOUND) {
236 hest_disable = HEST_NOT_FOUND;
237 return;
238 } else if (ACPI_FAILURE(status)) {
239 const char *msg = acpi_format_exception(status);
240 pr_err(HEST_PFX "Failed to get table, %s\n", msg);
241 rc = -EINVAL;
242 goto err;
243 }
244
245 rc = apei_hest_parse(hest_parse_cmc, NULL);
246 if (rc)
247 goto err;
248
249 if (!ghes_disable) {
250 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
251 if (rc)
252 goto err;
253 rc = hest_ghes_dev_register(ghes_count);
254 if (rc)
255 goto err;
256 }
257
258 pr_info(HEST_PFX "Table parsing has been initialized.\n");
259 return;
260err:
261 hest_disable = HEST_DISABLED;
262}
263
