mirror of
https://github.com/torvalds/linux.git
synced 2024-11-06 12:11:59 +00:00
755d4fe465
[Issue] Currently, a variable name, which identifies each entry, consists of type, id and ctime. But if multiple events happens in a short time, a second/third event may fail to log because efi_pstore can't distinguish each event with current variable name. [Solution] A reasonable way to identify all events precisely is introducing a sequence counter to the variable name. The sequence counter has already supported in a pstore layer with "oopscount". So, this patch adds it to a variable name. Also, it is passed to read/erase callbacks of platform drivers in accordance with the modification of the variable name. <before applying this patch> a variable name of first event: dump-type0-1-12345678 a variable name of second event: dump-type0-1-12345678 type:0 id:1 ctime:12345678 If multiple events happen in a short time, efi_pstore can't distinguish them because variable names are same among them. <after applying this patch> it can be distinguishable by adding a sequence counter as follows. a variable name of first event: dump-type0-1-1-12345678 a variable name of Second event: dump-type0-1-2-12345678 type:0 id:1 sequence counter: 1(first event), 2(second event) ctime:12345678 In case of a write callback executed in pstore_console_write(), "0" is added to an argument of the write callback because it just logs all kernel messages and doesn't need to care about multiple events. Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Mike Waychison <mikew@google.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
#ifndef __PSTORE_INTERNAL_H__
|
|
#define __PSTORE_INTERNAL_H__
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/time.h>
|
|
#include <linux/pstore.h>
|
|
|
|
#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
|
|
|
|
struct pstore_ftrace_record {
|
|
unsigned long ip;
|
|
unsigned long parent_ip;
|
|
#ifndef PSTORE_CPU_IN_IP
|
|
unsigned int cpu;
|
|
#endif
|
|
};
|
|
|
|
static inline void
|
|
pstore_ftrace_encode_cpu(struct pstore_ftrace_record *rec, unsigned int cpu)
|
|
{
|
|
#ifndef PSTORE_CPU_IN_IP
|
|
rec->cpu = cpu;
|
|
#else
|
|
rec->ip |= cpu;
|
|
#endif
|
|
}
|
|
|
|
static inline unsigned int
|
|
pstore_ftrace_decode_cpu(struct pstore_ftrace_record *rec)
|
|
{
|
|
#ifndef PSTORE_CPU_IN_IP
|
|
return rec->cpu;
|
|
#else
|
|
return rec->ip & PSTORE_CPU_IN_IP;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_PSTORE_FTRACE
|
|
extern void pstore_register_ftrace(void);
|
|
#else
|
|
static inline void pstore_register_ftrace(void) {}
|
|
#endif
|
|
|
|
extern struct pstore_info *psinfo;
|
|
|
|
extern void pstore_set_kmsg_bytes(int);
|
|
extern void pstore_get_records(int);
|
|
extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
|
|
int count, char *data, size_t size,
|
|
struct timespec time, struct pstore_info *psi);
|
|
extern int pstore_is_mounted(void);
|
|
|
|
#endif
|