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18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/acpi.h>
22#include <linux/kdebug.h>
23#include <linux/highmem.h>
24#include <linux/io.h>
25#include <linux/platform_device.h>
26#include <acpi/apei.h>
27#include <acpi/ghes.h>
28
29#include "apei-internal.h"
30
31#define HEST_PFX "HEST: "
32
33int hest_disable;
34EXPORT_SYMBOL_GPL(hest_disable);
35
36
37
38static struct acpi_table_hest *__read_mostly hest_tab;
39
40static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
41 [ACPI_HEST_TYPE_IA32_CHECK] = -1,
42 [ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
43 [ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
44 [ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
45 [ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
46 [ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
47 [ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
48 [ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
49 [ACPI_HEST_TYPE_IA32_DEFERRED_CHECK] = -1,
50};
51
52static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
53{
54 u16 hest_type = hest_hdr->type;
55 int len;
56
57 if (hest_type >= ACPI_HEST_TYPE_RESERVED)
58 return 0;
59
60 len = hest_esrc_len_tab[hest_type];
61
62 if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
63 struct acpi_hest_ia_corrected *cmc;
64 cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
65 len = sizeof(*cmc) + cmc->num_hardware_banks *
66 sizeof(struct acpi_hest_ia_error_bank);
67 } else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
68 struct acpi_hest_ia_machine_check *mc;
69 mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
70 len = sizeof(*mc) + mc->num_hardware_banks *
71 sizeof(struct acpi_hest_ia_error_bank);
72 } else if (hest_type == ACPI_HEST_TYPE_IA32_DEFERRED_CHECK) {
73 struct acpi_hest_ia_deferred_check *mc;
74 mc = (struct acpi_hest_ia_deferred_check *)hest_hdr;
75 len = sizeof(*mc) + mc->num_hardware_banks *
76 sizeof(struct acpi_hest_ia_error_bank);
77 }
78 BUG_ON(len == -1);
79
80 return len;
81};
82
83int apei_hest_parse(apei_hest_func_t func, void *data)
84{
85 struct acpi_hest_header *hest_hdr;
86 int i, rc, len;
87
88 if (hest_disable || !hest_tab)
89 return -EINVAL;
90
91 hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
92 for (i = 0; i < hest_tab->error_source_count; i++) {
93 len = hest_esrc_len(hest_hdr);
94 if (!len) {
95 pr_warning(FW_WARN HEST_PFX
96 "Unknown or unused hardware error source "
97 "type: %d for hardware error source: %d.\n",
98 hest_hdr->type, hest_hdr->source_id);
99 return -EINVAL;
100 }
101 if ((void *)hest_hdr + len >
102 (void *)hest_tab + hest_tab->header.length) {
103 pr_warning(FW_BUG HEST_PFX
104 "Table contents overflow for hardware error source: %d.\n",
105 hest_hdr->source_id);
106 return -EINVAL;
107 }
108
109 rc = func(hest_hdr, data);
110 if (rc)
111 return rc;
112
113 hest_hdr = (void *)hest_hdr + len;
114 }
115
116 return 0;
117}
118EXPORT_SYMBOL_GPL(apei_hest_parse);
119
120
121
122
123
124static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
125{
126 if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
127 return 0;
128
129 if (!acpi_disable_cmcff)
130 return !arch_apei_enable_cmcff(hest_hdr, data);
131
132 return 0;
133}
134
135struct ghes_arr {
136 struct platform_device **ghes_devs;
137 unsigned int count;
138};
139
140static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
141{
142 int *count = data;
143
144 if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
145 hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
146 (*count)++;
147 return 0;
148}
149
150static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
151{
152 struct platform_device *ghes_dev;
153 struct ghes_arr *ghes_arr = data;
154 int rc, i;
155
156 if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
157 hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
158 return 0;
159
160 if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
161 return 0;
162 for (i = 0; i < ghes_arr->count; i++) {
163 struct acpi_hest_header *hdr;
164 ghes_dev = ghes_arr->ghes_devs[i];
165 hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
166 if (hdr->source_id == hest_hdr->source_id) {
167 pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
168 hdr->source_id);
169 return -EIO;
170 }
171 }
172 ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
173 if (!ghes_dev)
174 return -ENOMEM;
175
176 rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
177 if (rc)
178 goto err;
179
180 rc = platform_device_add(ghes_dev);
181 if (rc)
182 goto err;
183 ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
184
185 return 0;
186err:
187 platform_device_put(ghes_dev);
188 return rc;
189}
190
191static int __init hest_ghes_dev_register(unsigned int ghes_count)
192{
193 int rc, i;
194 struct ghes_arr ghes_arr;
195
196 ghes_arr.count = 0;
197 ghes_arr.ghes_devs = kmalloc_array(ghes_count, sizeof(void *),
198 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;
205
206 rc = ghes_estatus_pool_init(ghes_count);
207 if (rc)
208 goto err;
209
210out:
211 kfree(ghes_arr.ghes_devs);
212 return rc;
213err:
214 for (i = 0; i < ghes_arr.count; i++)
215 platform_device_unregister(ghes_arr.ghes_devs[i]);
216 goto out;
217}
218
219static int __init setup_hest_disable(char *str)
220{
221 hest_disable = HEST_DISABLED;
222 return 0;
223}
224
225__setup("hest_disable", setup_hest_disable);
226
227void __init acpi_hest_init(void)
228{
229 acpi_status status;
230 int rc = -ENODEV;
231 unsigned int ghes_count = 0;
232
233 if (hest_disable) {
234 pr_info(HEST_PFX "Table parsing disabled.\n");
235 return;
236 }
237
238 status = acpi_get_table(ACPI_SIG_HEST, 0,
239 (struct acpi_table_header **)&hest_tab);
240 if (status == AE_NOT_FOUND) {
241 hest_disable = HEST_NOT_FOUND;
242 return;
243 } else if (ACPI_FAILURE(status)) {
244 const char *msg = acpi_format_exception(status);
245 pr_err(HEST_PFX "Failed to get table, %s\n", msg);
246 rc = -EINVAL;
247 goto err;
248 }
249
250 rc = apei_hest_parse(hest_parse_cmc, NULL);
251 if (rc)
252 goto err;
253
254 if (!ghes_disable) {
255 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
256 if (rc)
257 goto err;
258
259 if (ghes_count)
260 rc = hest_ghes_dev_register(ghes_count);
261 if (rc)
262 goto err;
263 }
264
265 pr_info(HEST_PFX "Table parsing has been initialized.\n");
266 return;
267err:
268 hest_disable = HEST_DISABLED;
269}
270
