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 PSTORE_TYPE_UNKNOWN = 255 39 }; 40 41 struct module; 42 43 struct 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 69 extern void pstore_ftrace_call(unsigned long ip, unsigned long parent_ip); 70 #else 71 static inline void pstore_ftrace_call(unsigned long ip, unsigned long parent_ip) 72 { } 73 #endif 74 75 #ifdef CONFIG_PSTORE 76 extern int pstore_register(struct pstore_info *); 77 #else 78 static inline int 79 pstore_register(struct pstore_info *psi) 80 { 81 return -ENODEV; 82 } 83 #endif 84 85 #endif /*_LINUX_PSTORE_H*/ 86