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/*
* Persistent Storage - pstore.h
*
* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
*
* This code is the generic layer to export data records from platform
* level persistent storage via a file system.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _LINUX_PSTORE_H
#define _LINUX_PSTORE_H
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/kmsg_dump.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/time.h>
#include <linux/types.h>
/* types */
enum pstore_type_id {
PSTORE_TYPE_DMESG = 0,
PSTORE_TYPE_MCE = 1,
PSTORE_TYPE_CONSOLE = 2,
PSTORE_TYPE_FTRACE = 3,
/* PPC64 partition types */
PSTORE_TYPE_PPC_RTAS = 4,
PSTORE_TYPE_PPC_OF = 5,
PSTORE_TYPE_PPC_COMMON = 6,
PSTORE_TYPE_PMSG = 7,
PSTORE_TYPE_PPC_OPAL = 8,
PSTORE_TYPE_UNKNOWN = 255
};
struct module;
struct pstore_info {
struct module *owner;
char *name;
spinlock_t buf_lock; /* serialize access to 'buf' */
char *buf;
size_t bufsize;
struct mutex read_mutex; /* serialize open/read/close */
int flags;
int (*open)(struct pstore_info *psi);
int (*close)(struct pstore_info *psi);
ssize_t (*read)(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time, char **buf,
bool *compressed, ssize_t *ecc_notice_size,
struct pstore_info *psi);
int (*write)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, int count, bool compressed,
size_t size, struct pstore_info *psi);
int (*write_buf)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, const char *buf, bool compressed,
size_t size, struct pstore_info *psi);
int (*write_buf_user)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, const char __user *buf,
bool compressed, size_t size, struct pstore_info *psi);
int (*erase)(enum pstore_type_id type, u64 id,
int count, struct timespec time,
struct pstore_info *psi);
void *data;
};
#define PSTORE_FLAGS_DMESG (1 << 0)
#define PSTORE_FLAGS_FRAGILE PSTORE_FLAGS_DMESG
#define PSTORE_FLAGS_CONSOLE (1 << 1)
#define PSTORE_FLAGS_FTRACE (1 << 2)
#define PSTORE_FLAGS_PMSG (1 << 3)
extern int pstore_register(struct pstore_info *);
extern void pstore_unregister(struct pstore_info *);
extern bool pstore_cannot_block_path(enum kmsg_dump_reason reason);
struct pstore_ftrace_record {
unsigned long ip;
unsigned long parent_ip;
u64 ts;
};
/*
* ftrace related stuff: Both backends and frontends need these so expose
* them here.
*/
#if NR_CPUS <= 2 && defined(CONFIG_ARM_THUMB)
#define PSTORE_CPU_IN_IP 0x1
#elif NR_CPUS <= 4 && defined(CONFIG_ARM)
#define PSTORE_CPU_IN_IP 0x3
#endif
#define TS_CPU_SHIFT 8
#define TS_CPU_MASK (BIT(TS_CPU_SHIFT) - 1)
/*
* If CPU number can be stored in IP, store it there, otherwise store it in
* the time stamp. This means more timestamp resolution is available when
* the CPU can be stored in the IP.
*/
#ifdef PSTORE_CPU_IN_IP
static inline void
pstore_ftrace_encode_cpu(struct pstore_ftrace_record *rec, unsigned int cpu)
{
rec->ip |= cpu;
}
static inline unsigned int
pstore_ftrace_decode_cpu(struct pstore_ftrace_record *rec)
{
return rec->ip & PSTORE_CPU_IN_IP;
}
static inline u64
pstore_ftrace_read_timestamp(struct pstore_ftrace_record *rec)
{
return rec->ts;
}
static inline void
pstore_ftrace_write_timestamp(struct pstore_ftrace_record *rec, u64 val)
{
rec->ts = val;
}
#else
static inline void
pstore_ftrace_encode_cpu(struct pstore_ftrace_record *rec, unsigned int cpu)
{
rec->ts &= ~(TS_CPU_MASK);
rec->ts |= cpu;
}
static inline unsigned int
pstore_ftrace_decode_cpu(struct pstore_ftrace_record *rec)
{
return rec->ts & TS_CPU_MASK;
}
static inline u64
pstore_ftrace_read_timestamp(struct pstore_ftrace_record *rec)
{
return rec->ts >> TS_CPU_SHIFT;
}
static inline void
pstore_ftrace_write_timestamp(struct pstore_ftrace_record *rec, u64 val)
{
rec->ts = (rec->ts & TS_CPU_MASK) | (val << TS_CPU_SHIFT);
}
#endif
#endif /*_LINUX_PSTORE_H*/
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