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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 PSTORE_TYPE_UNKNOWN = 255
39};
40
41struct module;
42
43struct pstore_info {
44 struct module *owner;
45 char *name;
46 spinlock_t buf_lock; /* serialize access to 'buf' */
47 char *buf;
48 size_t bufsize;
49 struct mutex read_mutex; /* serialize open/read/close */
50 int (*open)(struct pstore_info *psi);
51 int (*close)(struct pstore_info *psi);
52 ssize_t (*read)(u64 *id, enum pstore_type_id *type,
53 struct timespec *time, char **buf,
54 struct pstore_info *psi);
55 int (*write)(enum pstore_type_id type,
56 enum kmsg_dump_reason reason, u64 *id,
57 unsigned int part, size_t size, struct pstore_info *psi);
58 int (*write_buf)(enum pstore_type_id type,
59 enum kmsg_dump_reason reason, u64 *id,
60 unsigned int part, const char *buf, size_t size,
61 struct pstore_info *psi);
62 int (*erase)(enum pstore_type_id type, u64 id,
63 struct pstore_info *psi);
64 void *data;
65};
66
67
68#ifdef CONFIG_PSTORE_FTRACE
69extern void pstore_ftrace_call(unsigned long ip, unsigned long parent_ip);
70#else
71static inline void pstore_ftrace_call(unsigned long ip, unsigned long parent_ip)
72{ }
73#endif
74
75#ifdef CONFIG_PSTORE
76extern int pstore_register(struct pstore_info *);
77#else
78static inline int
79pstore_register(struct pstore_info *psi)
80{
81 return -ENODEV;
82}
83#endif
84
85#endif /*_LINUX_PSTORE_H*/