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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * esrt.c
4 *
5 * This module exports EFI System Resource Table (ESRT) entries into userspace
6 * through the sysfs file system. The ESRT provides a read-only catalog of
7 * system components for which the system accepts firmware upgrades via UEFI's
8 * "Capsule Update" feature. This module allows userland utilities to evaluate
9 * what firmware updates can be applied to this system, and potentially arrange
10 * for those updates to occur.
11 *
12 * Data is currently found below /sys/firmware/efi/esrt/...
13 */
14#define pr_fmt(fmt) "esrt: " fmt
15
16#include <linux/capability.h>
17#include <linux/device.h>
18#include <linux/efi.h>
19#include <linux/init.h>
20#include <linux/io.h>
21#include <linux/kernel.h>
22#include <linux/kobject.h>
23#include <linux/list.h>
24#include <linux/memblock.h>
25#include <linux/slab.h>
26#include <linux/types.h>
27
28#include <asm/io.h>
29#include <asm/early_ioremap.h>
30
31struct efi_system_resource_entry_v1 {
32 efi_guid_t fw_class;
33 u32 fw_type;
34 u32 fw_version;
35 u32 lowest_supported_fw_version;
36 u32 capsule_flags;
37 u32 last_attempt_version;
38 u32 last_attempt_status;
39};
40
41/*
42 * _count and _version are what they seem like. _max is actually just
43 * accounting info for the firmware when creating the table; it should never
44 * have been exposed to us. To wit, the spec says:
45 * The maximum number of resource array entries that can be within the
46 * table without reallocating the table, must not be zero.
47 * Since there's no guidance about what that means in terms of memory layout,
48 * it means nothing to us.
49 */
50struct efi_system_resource_table {
51 u32 fw_resource_count;
52 u32 fw_resource_count_max;
53 u64 fw_resource_version;
54 u8 entries[];
55};
56
57static phys_addr_t esrt_data;
58static size_t esrt_data_size;
59
60static struct efi_system_resource_table *esrt;
61
62struct esre_entry {
63 union {
64 struct efi_system_resource_entry_v1 *esre1;
65 } esre;
66
67 struct kobject kobj;
68 struct list_head list;
69};
70
71/* global list of esre_entry. */
72static LIST_HEAD(entry_list);
73
74/* entry attribute */
75struct esre_attribute {
76 struct attribute attr;
77 ssize_t (*show)(struct esre_entry *entry, char *buf);
78 ssize_t (*store)(struct esre_entry *entry,
79 const char *buf, size_t count);
80};
81
82static struct esre_entry *to_entry(struct kobject *kobj)
83{
84 return container_of(kobj, struct esre_entry, kobj);
85}
86
87static struct esre_attribute *to_attr(struct attribute *attr)
88{
89 return container_of(attr, struct esre_attribute, attr);
90}
91
92static ssize_t esre_attr_show(struct kobject *kobj,
93 struct attribute *_attr, char *buf)
94{
95 struct esre_entry *entry = to_entry(kobj);
96 struct esre_attribute *attr = to_attr(_attr);
97
98 /* Don't tell normal users what firmware versions we've got... */
99 if (!capable(CAP_SYS_ADMIN))
100 return -EACCES;
101
102 return attr->show(entry, buf);
103}
104
105static const struct sysfs_ops esre_attr_ops = {
106 .show = esre_attr_show,
107};
108
109/* Generic ESRT Entry ("ESRE") support. */
110static ssize_t fw_class_show(struct esre_entry *entry, char *buf)
111{
112 char *str = buf;
113
114 efi_guid_to_str(&entry->esre.esre1->fw_class, str);
115 str += strlen(str);
116 str += sprintf(str, "\n");
117
118 return str - buf;
119}
120
121static struct esre_attribute esre_fw_class = __ATTR_RO_MODE(fw_class, 0400);
122
123#define esre_attr_decl(name, size, fmt) \
124static ssize_t name##_show(struct esre_entry *entry, char *buf) \
125{ \
126 return sprintf(buf, fmt "\n", \
127 le##size##_to_cpu(entry->esre.esre1->name)); \
128} \
129\
130static struct esre_attribute esre_##name = __ATTR_RO_MODE(name, 0400)
131
132esre_attr_decl(fw_type, 32, "%u");
133esre_attr_decl(fw_version, 32, "%u");
134esre_attr_decl(lowest_supported_fw_version, 32, "%u");
135esre_attr_decl(capsule_flags, 32, "0x%x");
136esre_attr_decl(last_attempt_version, 32, "%u");
137esre_attr_decl(last_attempt_status, 32, "%u");
138
139static struct attribute *esre1_attrs[] = {
140 &esre_fw_class.attr,
141 &esre_fw_type.attr,
142 &esre_fw_version.attr,
143 &esre_lowest_supported_fw_version.attr,
144 &esre_capsule_flags.attr,
145 &esre_last_attempt_version.attr,
146 &esre_last_attempt_status.attr,
147 NULL
148};
149ATTRIBUTE_GROUPS(esre1);
150
151static void esre_release(struct kobject *kobj)
152{
153 struct esre_entry *entry = to_entry(kobj);
154
155 list_del(&entry->list);
156 kfree(entry);
157}
158
159static struct kobj_type esre1_ktype = {
160 .release = esre_release,
161 .sysfs_ops = &esre_attr_ops,
162 .default_groups = esre1_groups,
163};
164
165
166static struct kobject *esrt_kobj;
167static struct kset *esrt_kset;
168
169static int esre_create_sysfs_entry(void *esre, int entry_num)
170{
171 struct esre_entry *entry;
172
173 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
174 if (!entry)
175 return -ENOMEM;
176
177 entry->kobj.kset = esrt_kset;
178
179 if (esrt->fw_resource_version == 1) {
180 int rc = 0;
181
182 entry->esre.esre1 = esre;
183 rc = kobject_init_and_add(&entry->kobj, &esre1_ktype, NULL,
184 "entry%d", entry_num);
185 if (rc) {
186 kobject_put(&entry->kobj);
187 return rc;
188 }
189 }
190
191 list_add_tail(&entry->list, &entry_list);
192 return 0;
193}
194
195/* support for displaying ESRT fields at the top level */
196#define esrt_attr_decl(name, size, fmt) \
197static ssize_t name##_show(struct kobject *kobj, \
198 struct kobj_attribute *attr, char *buf)\
199{ \
200 return sprintf(buf, fmt "\n", le##size##_to_cpu(esrt->name)); \
201} \
202\
203static struct kobj_attribute esrt_##name = __ATTR_RO_MODE(name, 0400)
204
205esrt_attr_decl(fw_resource_count, 32, "%u");
206esrt_attr_decl(fw_resource_count_max, 32, "%u");
207esrt_attr_decl(fw_resource_version, 64, "%llu");
208
209static struct attribute *esrt_attrs[] = {
210 &esrt_fw_resource_count.attr,
211 &esrt_fw_resource_count_max.attr,
212 &esrt_fw_resource_version.attr,
213 NULL,
214};
215
216static inline int esrt_table_exists(void)
217{
218 if (!efi_enabled(EFI_CONFIG_TABLES))
219 return 0;
220 if (efi.esrt == EFI_INVALID_TABLE_ADDR)
221 return 0;
222 return 1;
223}
224
225static umode_t esrt_attr_is_visible(struct kobject *kobj,
226 struct attribute *attr, int n)
227{
228 if (!esrt_table_exists())
229 return 0;
230 return attr->mode;
231}
232
233static const struct attribute_group esrt_attr_group = {
234 .attrs = esrt_attrs,
235 .is_visible = esrt_attr_is_visible,
236};
237
238/*
239 * remap the table, validate it, mark it reserved and unmap it.
240 */
241void __init efi_esrt_init(void)
242{
243 void *va;
244 struct efi_system_resource_table tmpesrt;
245 size_t size, max, entry_size, entries_size;
246 efi_memory_desc_t md;
247 int rc;
248 phys_addr_t end;
249
250 if (!efi_enabled(EFI_MEMMAP))
251 return;
252
253 pr_debug("esrt-init: loading.\n");
254 if (!esrt_table_exists())
255 return;
256
257 rc = efi_mem_desc_lookup(efi.esrt, &md);
258 if (rc < 0 ||
259 (!(md.attribute & EFI_MEMORY_RUNTIME) &&
260 md.type != EFI_BOOT_SERVICES_DATA &&
261 md.type != EFI_RUNTIME_SERVICES_DATA)) {
262 pr_warn("ESRT header is not in the memory map.\n");
263 return;
264 }
265
266 max = efi_mem_desc_end(&md);
267 if (max < efi.esrt) {
268 pr_err("EFI memory descriptor is invalid. (esrt: %p max: %p)\n",
269 (void *)efi.esrt, (void *)max);
270 return;
271 }
272
273 size = sizeof(*esrt);
274 max -= efi.esrt;
275
276 if (max < size) {
277 pr_err("ESRT header doesn't fit on single memory map entry. (size: %zu max: %zu)\n",
278 size, max);
279 return;
280 }
281
282 va = early_memremap(efi.esrt, size);
283 if (!va) {
284 pr_err("early_memremap(%p, %zu) failed.\n", (void *)efi.esrt,
285 size);
286 return;
287 }
288
289 memcpy(&tmpesrt, va, sizeof(tmpesrt));
290 early_memunmap(va, size);
291
292 if (tmpesrt.fw_resource_version != 1) {
293 pr_err("Unsupported ESRT version %lld.\n",
294 tmpesrt.fw_resource_version);
295 return;
296 }
297
298 entry_size = sizeof(struct efi_system_resource_entry_v1);
299 if (tmpesrt.fw_resource_count > 0 && max - size < entry_size) {
300 pr_err("ESRT memory map entry can only hold the header. (max: %zu size: %zu)\n",
301 max - size, entry_size);
302 return;
303 }
304
305 /*
306 * The format doesn't really give us any boundary to test here,
307 * so I'm making up 128 as the max number of individually updatable
308 * components we support.
309 * 128 should be pretty excessive, but there's still some chance
310 * somebody will do that someday and we'll need to raise this.
311 */
312 if (tmpesrt.fw_resource_count > 128) {
313 pr_err("ESRT says fw_resource_count has very large value %d.\n",
314 tmpesrt.fw_resource_count);
315 return;
316 }
317
318 /*
319 * We know it can't be larger than N * sizeof() here, and N is limited
320 * by the previous test to a small number, so there's no overflow.
321 */
322 entries_size = tmpesrt.fw_resource_count * entry_size;
323 if (max < size + entries_size) {
324 pr_err("ESRT does not fit on single memory map entry (size: %zu max: %zu)\n",
325 size, max);
326 return;
327 }
328
329 size += entries_size;
330
331 esrt_data = (phys_addr_t)efi.esrt;
332 esrt_data_size = size;
333
334 end = esrt_data + size;
335 pr_info("Reserving ESRT space from %pa to %pa.\n", &esrt_data, &end);
336 if (md.type == EFI_BOOT_SERVICES_DATA)
337 efi_mem_reserve(esrt_data, esrt_data_size);
338
339 pr_debug("esrt-init: loaded.\n");
340}
341
342static int __init register_entries(void)
343{
344 struct efi_system_resource_entry_v1 *v1_entries = (void *)esrt->entries;
345 int i, rc;
346
347 if (!esrt_table_exists())
348 return 0;
349
350 for (i = 0; i < le32_to_cpu(esrt->fw_resource_count); i++) {
351 void *esre = NULL;
352 if (esrt->fw_resource_version == 1) {
353 esre = &v1_entries[i];
354 } else {
355 pr_err("Unsupported ESRT version %lld.\n",
356 esrt->fw_resource_version);
357 return -EINVAL;
358 }
359
360 rc = esre_create_sysfs_entry(esre, i);
361 if (rc < 0) {
362 pr_err("ESRT entry creation failed with error %d.\n",
363 rc);
364 return rc;
365 }
366 }
367 return 0;
368}
369
370static void cleanup_entry_list(void)
371{
372 struct esre_entry *entry, *next;
373
374 list_for_each_entry_safe(entry, next, &entry_list, list) {
375 kobject_put(&entry->kobj);
376 }
377}
378
379static int __init esrt_sysfs_init(void)
380{
381 int error;
382
383 pr_debug("esrt-sysfs: loading.\n");
384 if (!esrt_data || !esrt_data_size)
385 return -ENOSYS;
386
387 esrt = memremap(esrt_data, esrt_data_size, MEMREMAP_WB);
388 if (!esrt) {
389 pr_err("memremap(%pa, %zu) failed.\n", &esrt_data,
390 esrt_data_size);
391 return -ENOMEM;
392 }
393
394 esrt_kobj = kobject_create_and_add("esrt", efi_kobj);
395 if (!esrt_kobj) {
396 pr_err("Firmware table registration failed.\n");
397 error = -ENOMEM;
398 goto err;
399 }
400
401 error = sysfs_create_group(esrt_kobj, &esrt_attr_group);
402 if (error) {
403 pr_err("Sysfs attribute export failed with error %d.\n",
404 error);
405 goto err_remove_esrt;
406 }
407
408 esrt_kset = kset_create_and_add("entries", NULL, esrt_kobj);
409 if (!esrt_kset) {
410 pr_err("kset creation failed.\n");
411 error = -ENOMEM;
412 goto err_remove_group;
413 }
414
415 error = register_entries();
416 if (error)
417 goto err_cleanup_list;
418
419 pr_debug("esrt-sysfs: loaded.\n");
420
421 return 0;
422err_cleanup_list:
423 cleanup_entry_list();
424 kset_unregister(esrt_kset);
425err_remove_group:
426 sysfs_remove_group(esrt_kobj, &esrt_attr_group);
427err_remove_esrt:
428 kobject_put(esrt_kobj);
429err:
430 memunmap(esrt);
431 esrt = NULL;
432 return error;
433}
434device_initcall(esrt_sysfs_init);
435
436/*
437MODULE_AUTHOR("Peter Jones <pjones@redhat.com>");
438MODULE_DESCRIPTION("EFI System Resource Table support");
439MODULE_LICENSE("GPL");
440*/
1/*
2 * esrt.c
3 *
4 * This module exports EFI System Resource Table (ESRT) entries into userspace
5 * through the sysfs file system. The ESRT provides a read-only catalog of
6 * system components for which the system accepts firmware upgrades via UEFI's
7 * "Capsule Update" feature. This module allows userland utilities to evaluate
8 * what firmware updates can be applied to this system, and potentially arrange
9 * for those updates to occur.
10 *
11 * Data is currently found below /sys/firmware/efi/esrt/...
12 */
13#define pr_fmt(fmt) "esrt: " fmt
14
15#include <linux/capability.h>
16#include <linux/device.h>
17#include <linux/efi.h>
18#include <linux/init.h>
19#include <linux/io.h>
20#include <linux/kernel.h>
21#include <linux/kobject.h>
22#include <linux/list.h>
23#include <linux/memblock.h>
24#include <linux/slab.h>
25#include <linux/types.h>
26
27#include <asm/io.h>
28#include <asm/early_ioremap.h>
29
30struct efi_system_resource_entry_v1 {
31 efi_guid_t fw_class;
32 u32 fw_type;
33 u32 fw_version;
34 u32 lowest_supported_fw_version;
35 u32 capsule_flags;
36 u32 last_attempt_version;
37 u32 last_attempt_status;
38};
39
40/*
41 * _count and _version are what they seem like. _max is actually just
42 * accounting info for the firmware when creating the table; it should never
43 * have been exposed to us. To wit, the spec says:
44 * The maximum number of resource array entries that can be within the
45 * table without reallocating the table, must not be zero.
46 * Since there's no guidance about what that means in terms of memory layout,
47 * it means nothing to us.
48 */
49struct efi_system_resource_table {
50 u32 fw_resource_count;
51 u32 fw_resource_count_max;
52 u64 fw_resource_version;
53 u8 entries[];
54};
55
56static phys_addr_t esrt_data;
57static size_t esrt_data_size;
58
59static struct efi_system_resource_table *esrt;
60
61struct esre_entry {
62 union {
63 struct efi_system_resource_entry_v1 *esre1;
64 } esre;
65
66 struct kobject kobj;
67 struct list_head list;
68};
69
70/* global list of esre_entry. */
71static LIST_HEAD(entry_list);
72
73/* entry attribute */
74struct esre_attribute {
75 struct attribute attr;
76 ssize_t (*show)(struct esre_entry *entry, char *buf);
77 ssize_t (*store)(struct esre_entry *entry,
78 const char *buf, size_t count);
79};
80
81static struct esre_entry *to_entry(struct kobject *kobj)
82{
83 return container_of(kobj, struct esre_entry, kobj);
84}
85
86static struct esre_attribute *to_attr(struct attribute *attr)
87{
88 return container_of(attr, struct esre_attribute, attr);
89}
90
91static ssize_t esre_attr_show(struct kobject *kobj,
92 struct attribute *_attr, char *buf)
93{
94 struct esre_entry *entry = to_entry(kobj);
95 struct esre_attribute *attr = to_attr(_attr);
96
97 /* Don't tell normal users what firmware versions we've got... */
98 if (!capable(CAP_SYS_ADMIN))
99 return -EACCES;
100
101 return attr->show(entry, buf);
102}
103
104static const struct sysfs_ops esre_attr_ops = {
105 .show = esre_attr_show,
106};
107
108/* Generic ESRT Entry ("ESRE") support. */
109static ssize_t fw_class_show(struct esre_entry *entry, char *buf)
110{
111 char *str = buf;
112
113 efi_guid_to_str(&entry->esre.esre1->fw_class, str);
114 str += strlen(str);
115 str += sprintf(str, "\n");
116
117 return str - buf;
118}
119
120static struct esre_attribute esre_fw_class = __ATTR_RO_MODE(fw_class, 0400);
121
122#define esre_attr_decl(name, size, fmt) \
123static ssize_t name##_show(struct esre_entry *entry, char *buf) \
124{ \
125 return sprintf(buf, fmt "\n", \
126 le##size##_to_cpu(entry->esre.esre1->name)); \
127} \
128\
129static struct esre_attribute esre_##name = __ATTR_RO_MODE(name, 0400)
130
131esre_attr_decl(fw_type, 32, "%u");
132esre_attr_decl(fw_version, 32, "%u");
133esre_attr_decl(lowest_supported_fw_version, 32, "%u");
134esre_attr_decl(capsule_flags, 32, "0x%x");
135esre_attr_decl(last_attempt_version, 32, "%u");
136esre_attr_decl(last_attempt_status, 32, "%u");
137
138static struct attribute *esre1_attrs[] = {
139 &esre_fw_class.attr,
140 &esre_fw_type.attr,
141 &esre_fw_version.attr,
142 &esre_lowest_supported_fw_version.attr,
143 &esre_capsule_flags.attr,
144 &esre_last_attempt_version.attr,
145 &esre_last_attempt_status.attr,
146 NULL
147};
148static void esre_release(struct kobject *kobj)
149{
150 struct esre_entry *entry = to_entry(kobj);
151
152 list_del(&entry->list);
153 kfree(entry);
154}
155
156static struct kobj_type esre1_ktype = {
157 .release = esre_release,
158 .sysfs_ops = &esre_attr_ops,
159 .default_attrs = esre1_attrs,
160};
161
162
163static struct kobject *esrt_kobj;
164static struct kset *esrt_kset;
165
166static int esre_create_sysfs_entry(void *esre, int entry_num)
167{
168 struct esre_entry *entry;
169
170 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
171 if (!entry)
172 return -ENOMEM;
173
174 entry->kobj.kset = esrt_kset;
175
176 if (esrt->fw_resource_version == 1) {
177 int rc = 0;
178
179 entry->esre.esre1 = esre;
180 rc = kobject_init_and_add(&entry->kobj, &esre1_ktype, NULL,
181 "entry%d", entry_num);
182 if (rc) {
183 kfree(entry);
184 return rc;
185 }
186 }
187
188 list_add_tail(&entry->list, &entry_list);
189 return 0;
190}
191
192/* support for displaying ESRT fields at the top level */
193#define esrt_attr_decl(name, size, fmt) \
194static ssize_t name##_show(struct kobject *kobj, \
195 struct kobj_attribute *attr, char *buf)\
196{ \
197 return sprintf(buf, fmt "\n", le##size##_to_cpu(esrt->name)); \
198} \
199\
200static struct kobj_attribute esrt_##name = __ATTR_RO_MODE(name, 0400)
201
202esrt_attr_decl(fw_resource_count, 32, "%u");
203esrt_attr_decl(fw_resource_count_max, 32, "%u");
204esrt_attr_decl(fw_resource_version, 64, "%llu");
205
206static struct attribute *esrt_attrs[] = {
207 &esrt_fw_resource_count.attr,
208 &esrt_fw_resource_count_max.attr,
209 &esrt_fw_resource_version.attr,
210 NULL,
211};
212
213static inline int esrt_table_exists(void)
214{
215 if (!efi_enabled(EFI_CONFIG_TABLES))
216 return 0;
217 if (efi.esrt == EFI_INVALID_TABLE_ADDR)
218 return 0;
219 return 1;
220}
221
222static umode_t esrt_attr_is_visible(struct kobject *kobj,
223 struct attribute *attr, int n)
224{
225 if (!esrt_table_exists())
226 return 0;
227 return attr->mode;
228}
229
230static const struct attribute_group esrt_attr_group = {
231 .attrs = esrt_attrs,
232 .is_visible = esrt_attr_is_visible,
233};
234
235/*
236 * remap the table, validate it, mark it reserved and unmap it.
237 */
238void __init efi_esrt_init(void)
239{
240 void *va;
241 struct efi_system_resource_table tmpesrt;
242 struct efi_system_resource_entry_v1 *v1_entries;
243 size_t size, max, entry_size, entries_size;
244 efi_memory_desc_t md;
245 int rc;
246 phys_addr_t end;
247
248 pr_debug("esrt-init: loading.\n");
249 if (!esrt_table_exists())
250 return;
251
252 rc = efi_mem_desc_lookup(efi.esrt, &md);
253 if (rc < 0) {
254 pr_warn("ESRT header is not in the memory map.\n");
255 return;
256 }
257
258 max = efi_mem_desc_end(&md);
259 if (max < efi.esrt) {
260 pr_err("EFI memory descriptor is invalid. (esrt: %p max: %p)\n",
261 (void *)efi.esrt, (void *)max);
262 return;
263 }
264
265 size = sizeof(*esrt);
266 max -= efi.esrt;
267
268 if (max < size) {
269 pr_err("ESRT header doesn't fit on single memory map entry. (size: %zu max: %zu)\n",
270 size, max);
271 return;
272 }
273
274 va = early_memremap(efi.esrt, size);
275 if (!va) {
276 pr_err("early_memremap(%p, %zu) failed.\n", (void *)efi.esrt,
277 size);
278 return;
279 }
280
281 memcpy(&tmpesrt, va, sizeof(tmpesrt));
282 early_memunmap(va, size);
283
284 if (tmpesrt.fw_resource_version == 1) {
285 entry_size = sizeof (*v1_entries);
286 } else {
287 pr_err("Unsupported ESRT version %lld.\n",
288 tmpesrt.fw_resource_version);
289 return;
290 }
291
292 if (tmpesrt.fw_resource_count > 0 && max - size < entry_size) {
293 pr_err("ESRT memory map entry can only hold the header. (max: %zu size: %zu)\n",
294 max - size, entry_size);
295 return;
296 }
297
298 /*
299 * The format doesn't really give us any boundary to test here,
300 * so I'm making up 128 as the max number of individually updatable
301 * components we support.
302 * 128 should be pretty excessive, but there's still some chance
303 * somebody will do that someday and we'll need to raise this.
304 */
305 if (tmpesrt.fw_resource_count > 128) {
306 pr_err("ESRT says fw_resource_count has very large value %d.\n",
307 tmpesrt.fw_resource_count);
308 return;
309 }
310
311 /*
312 * We know it can't be larger than N * sizeof() here, and N is limited
313 * by the previous test to a small number, so there's no overflow.
314 */
315 entries_size = tmpesrt.fw_resource_count * entry_size;
316 if (max < size + entries_size) {
317 pr_err("ESRT does not fit on single memory map entry (size: %zu max: %zu)\n",
318 size, max);
319 return;
320 }
321
322 size += entries_size;
323
324 esrt_data = (phys_addr_t)efi.esrt;
325 esrt_data_size = size;
326
327 end = esrt_data + size;
328 pr_info("Reserving ESRT space from %pa to %pa.\n", &esrt_data, &end);
329 efi_mem_reserve(esrt_data, esrt_data_size);
330
331 pr_debug("esrt-init: loaded.\n");
332}
333
334static int __init register_entries(void)
335{
336 struct efi_system_resource_entry_v1 *v1_entries = (void *)esrt->entries;
337 int i, rc;
338
339 if (!esrt_table_exists())
340 return 0;
341
342 for (i = 0; i < le32_to_cpu(esrt->fw_resource_count); i++) {
343 void *esre = NULL;
344 if (esrt->fw_resource_version == 1) {
345 esre = &v1_entries[i];
346 } else {
347 pr_err("Unsupported ESRT version %lld.\n",
348 esrt->fw_resource_version);
349 return -EINVAL;
350 }
351
352 rc = esre_create_sysfs_entry(esre, i);
353 if (rc < 0) {
354 pr_err("ESRT entry creation failed with error %d.\n",
355 rc);
356 return rc;
357 }
358 }
359 return 0;
360}
361
362static void cleanup_entry_list(void)
363{
364 struct esre_entry *entry, *next;
365
366 list_for_each_entry_safe(entry, next, &entry_list, list) {
367 kobject_put(&entry->kobj);
368 }
369}
370
371static int __init esrt_sysfs_init(void)
372{
373 int error;
374
375 pr_debug("esrt-sysfs: loading.\n");
376 if (!esrt_data || !esrt_data_size)
377 return -ENOSYS;
378
379 esrt = memremap(esrt_data, esrt_data_size, MEMREMAP_WB);
380 if (!esrt) {
381 pr_err("memremap(%pa, %zu) failed.\n", &esrt_data,
382 esrt_data_size);
383 return -ENOMEM;
384 }
385
386 esrt_kobj = kobject_create_and_add("esrt", efi_kobj);
387 if (!esrt_kobj) {
388 pr_err("Firmware table registration failed.\n");
389 error = -ENOMEM;
390 goto err;
391 }
392
393 error = sysfs_create_group(esrt_kobj, &esrt_attr_group);
394 if (error) {
395 pr_err("Sysfs attribute export failed with error %d.\n",
396 error);
397 goto err_remove_esrt;
398 }
399
400 esrt_kset = kset_create_and_add("entries", NULL, esrt_kobj);
401 if (!esrt_kset) {
402 pr_err("kset creation failed.\n");
403 error = -ENOMEM;
404 goto err_remove_group;
405 }
406
407 error = register_entries();
408 if (error)
409 goto err_cleanup_list;
410
411 pr_debug("esrt-sysfs: loaded.\n");
412
413 return 0;
414err_cleanup_list:
415 cleanup_entry_list();
416 kset_unregister(esrt_kset);
417err_remove_group:
418 sysfs_remove_group(esrt_kobj, &esrt_attr_group);
419err_remove_esrt:
420 kobject_put(esrt_kobj);
421err:
422 memunmap(esrt);
423 esrt = NULL;
424 return error;
425}
426device_initcall(esrt_sysfs_init);
427
428/*
429MODULE_AUTHOR("Peter Jones <pjones@redhat.com>");
430MODULE_DESCRIPTION("EFI System Resource Table support");
431MODULE_LICENSE("GPL");
432*/