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/compiler.h> 26 #include <linux/errno.h> 27 #include <linux/kmsg_dump.h> 28 #include <linux/mutex.h> 29 #include <linux/spinlock.h> 30 #include <linux/time.h> 31 #include <linux/types.h> 32 33 /* types */ 34 enum pstore_type_id { 35 PSTORE_TYPE_DMESG = 0, 36 PSTORE_TYPE_MCE = 1, 37 PSTORE_TYPE_CONSOLE = 2, 38 PSTORE_TYPE_FTRACE = 3, 39 /* PPC64 partition types */ 40 PSTORE_TYPE_PPC_RTAS = 4, 41 PSTORE_TYPE_PPC_OF = 5, 42 PSTORE_TYPE_PPC_COMMON = 6, 43 PSTORE_TYPE_PMSG = 7, 44 PSTORE_TYPE_PPC_OPAL = 8, 45 PSTORE_TYPE_UNKNOWN = 255 46 }; 47 48 struct module; 49 50 struct pstore_info { 51 struct module *owner; 52 char *name; 53 spinlock_t buf_lock; /* serialize access to 'buf' */ 54 char *buf; 55 size_t bufsize; 56 struct mutex read_mutex; /* serialize open/read/close */ 57 int flags; 58 int (*open)(struct pstore_info *psi); 59 int (*close)(struct pstore_info *psi); 60 ssize_t (*read)(u64 *id, enum pstore_type_id *type, 61 int *count, struct timespec *time, char **buf, 62 bool *compressed, struct pstore_info *psi); 63 int (*write)(enum pstore_type_id type, 64 enum kmsg_dump_reason reason, u64 *id, 65 unsigned int part, int count, bool compressed, 66 size_t size, struct pstore_info *psi); 67 int (*write_buf)(enum pstore_type_id type, 68 enum kmsg_dump_reason reason, u64 *id, 69 unsigned int part, const char *buf, bool compressed, 70 size_t size, struct pstore_info *psi); 71 int (*write_buf_user)(enum pstore_type_id type, 72 enum kmsg_dump_reason reason, u64 *id, 73 unsigned int part, const char __user *buf, 74 bool compressed, size_t size, struct pstore_info *psi); 75 int (*erase)(enum pstore_type_id type, u64 id, 76 int count, struct timespec time, 77 struct pstore_info *psi); 78 void *data; 79 }; 80 81 #define PSTORE_FLAGS_FRAGILE 1 82 83 extern int pstore_register(struct pstore_info *); 84 extern void pstore_unregister(struct pstore_info *); 85 extern bool pstore_cannot_block_path(enum kmsg_dump_reason reason); 86 87 #endif /*_LINUX_PSTORE_H*/ 88