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_PMSG = 7, 43 PSTORE_TYPE_UNKNOWN = 255 44 }; 45 46 struct module; 47 48 struct pstore_info { 49 struct module *owner; 50 char *name; 51 spinlock_t buf_lock; /* serialize access to 'buf' */ 52 char *buf; 53 size_t bufsize; 54 struct mutex read_mutex; /* serialize open/read/close */ 55 int flags; 56 int (*open)(struct pstore_info *psi); 57 int (*close)(struct pstore_info *psi); 58 ssize_t (*read)(u64 *id, enum pstore_type_id *type, 59 int *count, struct timespec *time, char **buf, 60 bool *compressed, struct pstore_info *psi); 61 int (*write)(enum pstore_type_id type, 62 enum kmsg_dump_reason reason, u64 *id, 63 unsigned int part, int count, bool compressed, 64 size_t size, struct pstore_info *psi); 65 int (*write_buf)(enum pstore_type_id type, 66 enum kmsg_dump_reason reason, u64 *id, 67 unsigned int part, const char *buf, bool compressed, 68 size_t size, struct pstore_info *psi); 69 int (*erase)(enum pstore_type_id type, u64 id, 70 int count, struct timespec time, 71 struct pstore_info *psi); 72 void *data; 73 }; 74 75 #define PSTORE_FLAGS_FRAGILE 1 76 77 #ifdef CONFIG_PSTORE 78 extern int pstore_register(struct pstore_info *); 79 extern bool pstore_cannot_block_path(enum kmsg_dump_reason reason); 80 #else 81 static inline int 82 pstore_register(struct pstore_info *psi) 83 { 84 return -ENODEV; 85 } 86 static inline bool 87 pstore_cannot_block_path(enum kmsg_dump_reason reason) 88 { 89 return false; 90 } 91 #endif 92 93 #endif /*_LINUX_PSTORE_H*/ 94