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Some platforms have a small amount of non-volatile storage that can be used to store information useful to diagnose the cause of a system crash. This is the generic part of a file system interface that presents information from the crash as a series of files in /dev/pstore. Once the information has been seen, the underlying storage is freed by deleting the files. Signed-off-by: Tony Luck <tony.luck@intel.com>
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/*
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* Persistent Storage - pstore.h
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*
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* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
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*
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* This code is the generic layer to export data records from platform
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* level persistent storage via a file system.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_PSTORE_H
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#define _LINUX_PSTORE_H
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/* types */
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enum pstore_type_id {
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PSTORE_TYPE_DMESG = 0,
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PSTORE_TYPE_MCE = 1,
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PSTORE_TYPE_UNKNOWN = 255
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};
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struct pstore_info {
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struct module *owner;
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char *name;
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struct mutex buf_mutex; /* serialize access to 'buf' */
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char *buf;
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size_t bufsize;
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size_t (*read)(u64 *id, enum pstore_type_id *type,
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struct timespec *time);
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u64 (*write)(enum pstore_type_id type, size_t size);
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int (*erase)(u64 id);
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};
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#ifdef CONFIG_PSTORE
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extern int pstore_register(struct pstore_info *);
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extern int pstore_write(enum pstore_type_id type, char *buf, size_t size);
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#else
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static inline int
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pstore_register(struct pstore_info *psi)
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{
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return -ENODEV;
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}
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static inline int
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pstore_write(enum pstore_type_id type, char *buf, size_t size)
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{
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return -ENODEV;
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}
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#endif
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#endif /*_LINUX_PSTORE_H*/
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