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1 | /* |
2 | * Persistent Storage - pstore.h |
3 | * |
4 | * Copyright (C) 2010 Intel Corporation <tony.luck@intel.com> |
5 | * |
6 | * This code is the generic layer to export data records from platform |
7 | * level persistent storage via a file system. |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License version 2 as |
11 | * published by the Free Software Foundation. |
12 | * |
13 | * This program is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | * GNU General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with this program; if not, write to the Free Software |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
21 | */ |
22 | #ifndef _LINUX_PSTORE_H |
23 | #define _LINUX_PSTORE_H |
24 | |
25 | #include <linux/time.h> |
26 | #include <linux/kmsg_dump.h> |
27 | #include <linux/mutex.h> |
28 | #include <linux/types.h> |
29 | #include <linux/spinlock.h> |
30 | #include <linux/errno.h> |
31 | |
32 | /* types */ |
33 | enum pstore_type_id { |
34 | PSTORE_TYPE_DMESG = 0, |
35 | PSTORE_TYPE_MCE = 1, |
36 | PSTORE_TYPE_CONSOLE = 2, |
37 | PSTORE_TYPE_FTRACE = 3, |
38 | /* PPC64 partition types */ |
39 | PSTORE_TYPE_PPC_RTAS = 4, |
40 | PSTORE_TYPE_PPC_OF = 5, |
41 | PSTORE_TYPE_PPC_COMMON = 6, |
42 | PSTORE_TYPE_UNKNOWN = 255 |
43 | }; |
44 | |
45 | struct module; |
46 | |
47 | struct pstore_info { |
48 | struct module *owner; |
49 | char *name; |
50 | spinlock_t buf_lock; /* serialize access to 'buf' */ |
51 | char *buf; |
52 | size_t bufsize; |
53 | struct mutex read_mutex; /* serialize open/read/close */ |
54 | int (*open)(struct pstore_info *psi); |
55 | int (*close)(struct pstore_info *psi); |
56 | ssize_t (*read)(u64 *id, enum pstore_type_id *type, |
57 | int *count, struct timespec *time, char **buf, |
58 | bool *compressed, struct pstore_info *psi); |
59 | int (*write)(enum pstore_type_id type, |
60 | enum kmsg_dump_reason reason, u64 *id, |
61 | unsigned int part, int count, bool compressed, |
62 | size_t size, struct pstore_info *psi); |
63 | int (*write_buf)(enum pstore_type_id type, |
64 | enum kmsg_dump_reason reason, u64 *id, |
65 | unsigned int part, const char *buf, bool compressed, |
66 | size_t size, struct pstore_info *psi); |
67 | int (*erase)(enum pstore_type_id type, u64 id, |
68 | int count, struct timespec time, |
69 | struct pstore_info *psi); |
70 | void *data; |
71 | }; |
72 | |
73 | #ifdef CONFIG_PSTORE |
74 | extern int pstore_register(struct pstore_info *); |
75 | extern bool pstore_cannot_block_path(enum kmsg_dump_reason reason); |
76 | #else |
77 | static inline int |
78 | pstore_register(struct pstore_info *psi) |
79 | { |
80 | return -ENODEV; |
81 | } |
82 | static inline bool |
83 | pstore_cannot_block_path(enum kmsg_dump_reason reason) |
84 | { |
85 | return false; |
86 | } |
87 | #endif |
88 | |
89 | #endif /*_LINUX_PSTORE_H*/ |
90 |
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