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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); | |
7dcb7848 | 10 | typedef ssize_t (*pstore_zone_erase_op)(size_t, loff_t); |
d26c3321 WL |
11 | /** |
12 | * struct pstore_zone_info - pstore/zone back-end driver structure | |
13 | * | |
14 | * @owner: Module which is responsible for this back-end driver. | |
15 | * @name: Name of the back-end driver. | |
16 | * @total_size: The total size in bytes pstore/zone can use. It must be greater | |
17 | * than 4096 and be multiple of 4096. | |
18 | * @kmsg_size: The size of oops/panic zone. Zero means disabled, otherwise, | |
19 | * it must be multiple of SECTOR_SIZE(512 Bytes). | |
20 | * @max_reason: Maximum kmsg dump reason to store. | |
0dc06826 | 21 | * @pmsg_size: The size of pmsg zone which is the same as @kmsg_size. |
cc9c4d1b | 22 | * @console_size:The size of console zone which is the same as @kmsg_size. |
34327e9f | 23 | * @ftrace_size:The size of ftrace zone which is the same as @kmsg_size. |
d26c3321 WL |
24 | * @read: The general read operation. Both of the function parameters |
25 | * @size and @offset are relative value to storage. | |
26 | * On success, the number of bytes should be returned, others | |
335426c6 WL |
27 | * mean error. |
28 | * @write: The same as @read, but the following error number: | |
29 | * -EBUSY means try to write again later. | |
30 | * -ENOMSG means to try next zone. | |
7dcb7848 WL |
31 | * @erase: The general erase operation for device with special removing |
32 | * job. Both of the function parameters @size and @offset are | |
33 | * relative value to storage. | |
34 | * Return 0 on success and others on failure. | |
d26c3321 | 35 | * @panic_write:The write operation only used for panic case. It's optional |
335426c6 WL |
36 | * if you do not care panic log. The parameters are relative |
37 | * value to storage. | |
38 | * On success, the number of bytes should be returned, others | |
39 | * excluding -ENOMSG mean error. -ENOMSG means to try next zone. | |
d26c3321 WL |
40 | */ |
41 | struct pstore_zone_info { | |
42 | struct module *owner; | |
43 | const char *name; | |
44 | ||
45 | unsigned long total_size; | |
46 | unsigned long kmsg_size; | |
47 | int max_reason; | |
0dc06826 | 48 | unsigned long pmsg_size; |
cc9c4d1b | 49 | unsigned long console_size; |
34327e9f | 50 | unsigned long ftrace_size; |
d26c3321 WL |
51 | pstore_zone_read_op read; |
52 | pstore_zone_write_op write; | |
7dcb7848 | 53 | pstore_zone_erase_op erase; |
d26c3321 WL |
54 | pstore_zone_write_op panic_write; |
55 | }; | |
56 | ||
57 | extern int register_pstore_zone(struct pstore_zone_info *info); | |
58 | extern void unregister_pstore_zone(struct pstore_zone_info *info); | |
59 | ||
60 | #endif |