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d26c3321 WL |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | ||
3 | #ifndef __PSTORE_ZONE_H_ | |
4 | #define __PSTORE_ZONE_H_ | |
5 | ||
6 | #include <linux/types.h> | |
7 | ||
8 | typedef ssize_t (*pstore_zone_read_op)(char *, size_t, loff_t); | |
9 | typedef ssize_t (*pstore_zone_write_op)(const char *, size_t, loff_t); | |
10 | /** | |
11 | * struct pstore_zone_info - pstore/zone back-end driver structure | |
12 | * | |
13 | * @owner: Module which is responsible for this back-end driver. | |
14 | * @name: Name of the back-end driver. | |
15 | * @total_size: The total size in bytes pstore/zone can use. It must be greater | |
16 | * than 4096 and be multiple of 4096. | |
17 | * @kmsg_size: The size of oops/panic zone. Zero means disabled, otherwise, | |
18 | * it must be multiple of SECTOR_SIZE(512 Bytes). | |
19 | * @max_reason: Maximum kmsg dump reason to store. | |
20 | * @read: The general read operation. Both of the function parameters | |
21 | * @size and @offset are relative value to storage. | |
22 | * On success, the number of bytes should be returned, others | |
23 | * means error. | |
24 | * @write: The same as @read. | |
25 | * @panic_write:The write operation only used for panic case. It's optional | |
26 | * if you do not care panic log. The parameters and return value | |
27 | * are the same as @read. | |
28 | */ | |
29 | struct pstore_zone_info { | |
30 | struct module *owner; | |
31 | const char *name; | |
32 | ||
33 | unsigned long total_size; | |
34 | unsigned long kmsg_size; | |
35 | int max_reason; | |
36 | pstore_zone_read_op read; | |
37 | pstore_zone_write_op write; | |
38 | pstore_zone_write_op panic_write; | |
39 | }; | |
40 | ||
41 | extern int register_pstore_zone(struct pstore_zone_info *info); | |
42 | extern void unregister_pstore_zone(struct pstore_zone_info *info); | |
43 | ||
44 | #endif |