1 // SPDX-License-Identifier: GPL-2.0+
28 	psi->data = NULL;  in efi_pstore_open()
34 	psi->data = NULL;  in efi_pstore_close()
43 static int efi_pstore_read_func(struct efivar_entry *entry,  in efi_pstore_read_func()  argument
47 	char name[DUMP_NAME_LEN], data_type;  in efi_pstore_read_func()  local
54 	if (efi_guidcmp(entry->var.VendorGuid, vendor))  in efi_pstore_read_func()
58 		name[i] = entry->var.VariableName[i];  in efi_pstore_read_func()
60 	if (sscanf(name, "dump-type%u-%u-%d-%llu-%c",  in efi_pstore_read_func()
61 		   &record->type, &part, &cnt, &time, &data_type) == 5) {  in efi_pstore_read_func()
62 		record->id = generic_id(time, part, cnt);  in efi_pstore_read_func()
63 		record->part = part;  in efi_pstore_read_func()
64 		record->count = cnt;  in efi_pstore_read_func()
65 		record->time.tv_sec = time;  in efi_pstore_read_func()
66 		record->time.tv_nsec = 0;  in efi_pstore_read_func()
68 			record->compressed = true;  in efi_pstore_read_func()
70 			record->compressed = false;  in efi_pstore_read_func()
71 		record->ecc_notice_size = 0;  in efi_pstore_read_func()
72 	} else if (sscanf(name, "dump-type%u-%u-%d-%llu",  in efi_pstore_read_func()
73 		   &record->type, &part, &cnt, &time) == 4) {  in efi_pstore_read_func()
74 		record->id = generic_id(time, part, cnt);  in efi_pstore_read_func()
75 		record->part = part;  in efi_pstore_read_func()
76 		record->count = cnt;  in efi_pstore_read_func()
77 		record->time.tv_sec = time;  in efi_pstore_read_func()
78 		record->time.tv_nsec = 0;  in efi_pstore_read_func()
79 		record->compressed = false;  in efi_pstore_read_func()
80 		record->ecc_notice_size = 0;  in efi_pstore_read_func()
81 	} else if (sscanf(name, "dump-type%u-%u-%llu",  in efi_pstore_read_func()
82 			  &record->type, &part, &time) == 3) {  in efi_pstore_read_func()
88 		record->id = generic_id(time, part, 0);  in efi_pstore_read_func()
89 		record->part = part;  in efi_pstore_read_func()
90 		record->count = 0;  in efi_pstore_read_func()
91 		record->time.tv_sec = time;  in efi_pstore_read_func()
92 		record->time.tv_nsec = 0;  in efi_pstore_read_func()
93 		record->compressed = false;  in efi_pstore_read_func()
94 		record->ecc_notice_size = 0;  in efi_pstore_read_func()
98 	entry->var.DataSize = 1024;  in efi_pstore_read_func()
99 	__efivar_entry_get(entry, &entry->var.Attributes,  in efi_pstore_read_func()
100 			   &entry->var.DataSize, entry->var.Data);  in efi_pstore_read_func()
101 	size = entry->var.DataSize;  in efi_pstore_read_func()
102 	memcpy(record->buf, entry->var.Data,  in efi_pstore_read_func()
110  * @pos: scanning entry
111  * @next: next entry
118 	pos->scanning = true;  in efi_pstore_scan_sysfs_enter()
119 	if (&next->list != head)  in efi_pstore_scan_sysfs_enter()
120 		next->scanning = true;  in efi_pstore_scan_sysfs_enter()
125  * @entry: deleting entry
128 static inline int __efi_pstore_scan_sysfs_exit(struct efivar_entry *entry,  in __efi_pstore_scan_sysfs_exit()  argument
131 	if (entry->deleting) {  in __efi_pstore_scan_sysfs_exit()
132 		list_del(&entry->list);  in __efi_pstore_scan_sysfs_exit()
134 		kfree(entry);  in __efi_pstore_scan_sysfs_exit()
136 			return -EINTR;  in __efi_pstore_scan_sysfs_exit()
138 		entry->scanning = false;  in __efi_pstore_scan_sysfs_exit()
145  * @pos: scanning entry
146  * @next: next entry
160 		ret = __efi_pstore_scan_sysfs_exit(next, &next->list != head);  in efi_pstore_scan_sysfs_exit()
175 	struct efivar_entry **pos = (struct efivar_entry **)&record->psi->data;  in efi_pstore_sysfs_entry_iter()
176 	struct efivar_entry *entry, *n;  in efi_pstore_sysfs_entry_iter()  local
182 		list_for_each_entry_safe(entry, n, head, list) {  in efi_pstore_sysfs_entry_iter()
183 			efi_pstore_scan_sysfs_enter(entry, n, head);  in efi_pstore_sysfs_entry_iter()
185 			size = efi_pstore_read_func(entry, record);  in efi_pstore_sysfs_entry_iter()
186 			ret = efi_pstore_scan_sysfs_exit(entry, n, head,  in efi_pstore_sysfs_entry_iter()
214  * This function returns a size of NVRAM entry logged via efi_pstore_write().
217  * size > 0: Got data of an entry logged via efi_pstore_write() successfully,
219  * size == 0: Entry was not logged via efi_pstore_write(),
221  * size < 0: Failed to get data of entry logging via efi_pstore_write(),
222  *           and pstore will stop reading entry.
228 	record->buf = kzalloc(EFIVARS_DATA_SIZE_MAX, GFP_KERNEL);  in efi_pstore_read()
229 	if (!record->buf)  in efi_pstore_read()
230 		return -ENOMEM;  in efi_pstore_read()
233 		size = -EINTR;  in efi_pstore_read()
241 		kfree(record->buf);  in efi_pstore_read()
242 		record->buf = NULL;  in efi_pstore_read()
249 	char name[DUMP_NAME_LEN];  in efi_pstore_write()  local
254 	record->id = generic_id(record->time.tv_sec, record->part,  in efi_pstore_write()
255 				record->count);  in efi_pstore_write()
257 	/* Since we copy the entire length of name, make sure it is wiped. */  in efi_pstore_write()
258 	memset(name, 0, sizeof(name));  in efi_pstore_write()
260 	snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lld-%c",  in efi_pstore_write()
261 		 record->type, record->part, record->count,  in efi_pstore_write()
262 		 (long long)record->time.tv_sec,  in efi_pstore_write()
263 		 record->compressed ? 'C' : 'D');  in efi_pstore_write()
266 		efi_name[i] = name[i];  in efi_pstore_write()
269 			      preemptible(), record->size, record->psi->buf);  in efi_pstore_write()
271 	if (record->reason == KMSG_DUMP_OOPS && try_module_get(THIS_MODULE))  in efi_pstore_write()
279  * Clean up an entry with the same name
281 static int efi_pstore_erase_func(struct efivar_entry *entry, void *data)  in efi_pstore_erase_func()  argument
287 	if (efi_guidcmp(entry->var.VendorGuid, vendor))  in efi_pstore_erase_func()
290 	if (ucs2_strncmp(entry->var.VariableName, efi_name, (size_t)ucs2_len))  in efi_pstore_erase_func()
293 	if (entry->scanning) {  in efi_pstore_erase_func()
295 		 * Skip deletion because this entry will be deleted  in efi_pstore_erase_func()
298 		entry->deleting = true;  in efi_pstore_erase_func()
300 		list_del(&entry->list);  in efi_pstore_erase_func()
303 	__efivar_entry_delete(entry);  in efi_pstore_erase_func()
308 static int efi_pstore_erase_name(const char *name)  in efi_pstore_erase_name()  argument
310 	struct efivar_entry *entry = NULL;  in efi_pstore_erase_name()  local
315 		efi_name[i] = name[i];  in efi_pstore_erase_name()
316 		if (name[i] == '\0')  in efi_pstore_erase_name()
321 		return -EINTR;  in efi_pstore_erase_name()
324 				    efi_name, &entry);  in efi_pstore_erase_name()
327 	if (found && !entry->scanning)  in efi_pstore_erase_name()
328 		kfree(entry);  in efi_pstore_erase_name()
330 	return found ? 0 : -ENOENT;  in efi_pstore_erase_name()
335 	char name[DUMP_NAME_LEN];  in efi_pstore_erase()  local
338 	snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lld",  in efi_pstore_erase()
339 		 record->type, record->part, record->count,  in efi_pstore_erase()
340 		 (long long)record->time.tv_sec);  in efi_pstore_erase()
341 	ret = efi_pstore_erase_name(name);  in efi_pstore_erase()
342 	if (ret != -ENOENT)  in efi_pstore_erase()
345 	snprintf(name, sizeof(name), "dump-type%u-%u-%lld",  in efi_pstore_erase()
346 		record->type, record->part, (long long)record->time.tv_sec);  in efi_pstore_erase()
347 	ret = efi_pstore_erase_name(name);  in efi_pstore_erase()
354 	.name		= "efi",
363 static int efi_pstore_callback(efi_char16_t *name, efi_guid_t vendor,  in efi_pstore_callback()  argument
366 	struct efivar_entry *entry;  in efi_pstore_callback()  local
369 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);  in efi_pstore_callback()
370 	if (!entry)  in efi_pstore_callback()
371 		return -ENOMEM;  in efi_pstore_callback()
373 	memcpy(entry->var.VariableName, name, name_size);  in efi_pstore_callback()
374 	entry->var.VendorGuid = vendor;  in efi_pstore_callback()
376 	ret = efivar_entry_add(entry, &efi_pstore_list);  in efi_pstore_callback()
378 		kfree(entry);  in efi_pstore_callback()
383 static int efi_pstore_update_entry(efi_char16_t *name, efi_guid_t vendor,  in efi_pstore_update_entry()  argument
386 	struct efivar_entry *entry = data;  in efi_pstore_update_entry()  local
388 	if (efivar_entry_find(name, vendor, &efi_pstore_list, false))  in efi_pstore_update_entry()
391 	memcpy(entry->var.VariableName, name, name_size);  in efi_pstore_update_entry()
392 	memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));  in efi_pstore_update_entry()
399 	struct efivar_entry *entry;  in efi_pstore_update_entries()  local
404 		entry = kzalloc(sizeof(*entry), GFP_KERNEL);  in efi_pstore_update_entries()
405 		if (!entry)  in efi_pstore_update_entries()
408 		err = efivar_init(efi_pstore_update_entry, entry,  in efi_pstore_update_entries()
413 		efivar_entry_add(entry, &efi_pstore_list);  in efi_pstore_update_entries()
416 	kfree(entry);  in efi_pstore_update_entries()
436 		return -ENOMEM;  in efivars_pstore_init()