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f20fbdb1b8
A secured user-space accessible pstore object. Writes
to /dev/pmsg0 are appended to the buffer, on reboot
the persistent contents are available in
/sys/fs/pstore/pmsg-ramoops-[ID].
One possible use is syslogd, or other daemon, can
write messages, then on reboot provides a means to
triage user-space activities leading up to a panic
as a companion to the pstore dmesg or console logs.
Signed-off-by: Mark Salyzyn <salyzyn@android.com>
v2: switch from snprintf to scnprintf
v3: split out prz_ok checking into PATCH 3/5
replace pmsg_lseek with noop_llseek
use pr_fmt() macro
make write atomic and use a vmalloc'd bounce buffer
v4: use mutex_lock instead of spin_lock.
Change-Id: I82a2a9a989d7583c5fcb65ff520027dc3a034a4c
Git-commit: 53d8e1c7141617e8656420afb44f9536e7cf0519
Git-repo: https://android.googlesource.com/kernel/common.git
Signed-off-by: Ian Maund <imaund@codeaurora.org>
86 lines
2.5 KiB
C
86 lines
2.5 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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#include <linux/time.h>
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#include <linux/kmsg_dump.h>
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#include <linux/mutex.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/errno.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_CONSOLE = 2,
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PSTORE_TYPE_FTRACE = 3,
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PSTORE_TYPE_PMSG = 4, /* Backport: 7 in upstream 3.19.0-rc3 */
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PSTORE_TYPE_UNKNOWN = 255
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};
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struct module;
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struct pstore_info {
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struct module *owner;
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char *name;
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spinlock_t buf_lock; /* serialize access to 'buf' */
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char *buf;
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size_t bufsize;
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struct mutex read_mutex; /* serialize open/read/close */
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int (*open)(struct pstore_info *psi);
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int (*close)(struct pstore_info *psi);
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ssize_t (*read)(u64 *id, enum pstore_type_id *type,
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int *count, struct timespec *time, char **buf,
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struct pstore_info *psi);
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int (*write)(enum pstore_type_id type,
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enum kmsg_dump_reason reason, u64 *id,
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unsigned int part, int count, size_t size,
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struct pstore_info *psi);
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int (*write_buf)(enum pstore_type_id type,
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enum kmsg_dump_reason reason, u64 *id,
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unsigned int part, const char *buf, size_t size,
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struct pstore_info *psi);
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int (*erase)(enum pstore_type_id type, u64 id,
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int count, struct timespec time,
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struct pstore_info *psi);
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void *data;
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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 bool pstore_cannot_block_path(enum kmsg_dump_reason reason);
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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 bool
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pstore_cannot_block_path(enum kmsg_dump_reason reason)
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{
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return false;
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}
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#endif
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#endif /*_LINUX_PSTORE_H*/
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