mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-02 08:34:20 +08:00
060287b8c4
With this support kernel can save function call chain log into a persistent ram buffer that can be decoded and dumped after reboot through pstore filesystem. It can be used to determine what function was last called before a reset or panic. We store the log in a binary format and then decode it at read time. p.s. Mostly the code comes from trace_persistent.c driver found in the Android git tree, written by Colin Cross <ccross@android.com> (according to sign-off history). I reworked the driver a little bit, and ported it to pstore. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
/*
|
|
* Copyright 2012 Google, Inc.
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/irqflags.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/atomic.h>
|
|
#include <asm/barrier.h>
|
|
#include "internal.h"
|
|
|
|
void notrace pstore_ftrace_call(unsigned long ip, unsigned long parent_ip)
|
|
{
|
|
struct pstore_ftrace_record rec = {};
|
|
|
|
if (unlikely(oops_in_progress))
|
|
return;
|
|
|
|
rec.ip = ip;
|
|
rec.parent_ip = parent_ip;
|
|
pstore_ftrace_encode_cpu(&rec, raw_smp_processor_id());
|
|
psinfo->write_buf(PSTORE_TYPE_FTRACE, 0, NULL, 0, (void *)&rec,
|
|
sizeof(rec), psinfo);
|
|
}
|