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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 */
33enum 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
45struct module;
46
47struct 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 flags;
55 int (*open)(struct pstore_info *psi);
56 int (*close)(struct pstore_info *psi);
57 ssize_t (*read)(u64 *id, enum pstore_type_id *type,
58 int *count, struct timespec *time, char **buf,
59 bool *compressed, struct pstore_info *psi);
60 int (*write)(enum pstore_type_id type,
61 enum kmsg_dump_reason reason, u64 *id,
62 unsigned int part, int count, bool compressed,
63 size_t size, struct pstore_info *psi);
64 int (*write_buf)(enum pstore_type_id type,
65 enum kmsg_dump_reason reason, u64 *id,
66 unsigned int part, const char *buf, bool compressed,
67 size_t size, struct pstore_info *psi);
68 int (*erase)(enum pstore_type_id type, u64 id,
69 int count, struct timespec time,
70 struct pstore_info *psi);
71 void *data;
72};
73
74#define PSTORE_FLAGS_FRAGILE 1
75
76#ifdef CONFIG_PSTORE
77extern int pstore_register(struct pstore_info *);
78extern bool pstore_cannot_block_path(enum kmsg_dump_reason reason);
79#else
80static inline int
81pstore_register(struct pstore_info *psi)
82{
83 return -ENODEV;
84}
85static inline bool
86pstore_cannot_block_path(enum kmsg_dump_reason reason)
87{
88 return false;
89}
90#endif
91
92#endif /*_LINUX_PSTORE_H*/