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arm64: perf: add debug patch logging framework

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Provide a mechanism to track which msm perf patches
are present in a kernel. Some kernel branches do not
include all patches which causes problems trying
to debug perf issues. This framework provides a way
to keep track of which patches have been included
in a build.

Change-Id: I7d3e3022dcdec6204f8d2ba3c49fc37c674db221
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>
[satyap: trivial merge conflict resolution]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
This commit is contained in:
Neil Leeder 2014-03-11 13:00:36 -04:00 • committed by David Keitel
parent b5bcae491a
commit 714e856cdf
2 changed files with 65 additions and 1 deletions
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2
arch/arm64/kernel/Makefile
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@ -31,7 +31,7 @@ arm64-obj-$(CONFIG_COMPAT) += sys32.o kuser32.o signal32.o \
arm64-obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o entry-ftrace.o
arm64-obj-$(CONFIG_MODULES) += arm64ksyms.o module.o
arm64-obj-$(CONFIG_PERF_EVENTS) += perf_regs.o perf_callchain.o
arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o
arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o perf_debug.o
arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
arm64-obj-$(CONFIG_CPU_PM) += sleep.o suspend.o
arm64-obj-$(CONFIG_CPU_IDLE) += cpuidle.o

64
arch/arm64/kernel/perf_debug.c Normal file
View file

@ -0,0 +1,64 @@
/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only 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.
*/
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/debugfs.h>
/*
* Subsequent patches should add an entry to end of this string.
* Format is incrementing sequence number followed by text of
* patch commit title with newline.
* Note trailing ';' is on its own line to simplify addition of
* future strings.
*/
static char *descriptions =
" 0 arm64: perf: add debug patch logging framework\n"
;
static ssize_t desc_read(struct file *fp, char __user *buf,
size_t count, loff_t *pos)
{
return simple_read_from_buffer(buf, count, pos, descriptions,
strlen(descriptions));
}
static const struct file_operations perf_debug_desc_fops = {
.read = desc_read,
};
static int perf_debugfs_init(void)
{
int ret = 0;
struct dentry *dir;
struct dentry *file;
dir = debugfs_create_dir("msm-perf-patches", NULL);
if (IS_ERR_OR_NULL(dir)) {
pr_err("failed to create msm-perf-patches dir in debugfs\n");
ret = PTR_ERR(dir);
goto init_exit;
}
file = debugfs_create_file("descriptions", 0444, dir, NULL,
&perf_debug_desc_fops);
if (IS_ERR_OR_NULL(file)) {
debugfs_remove(dir);
pr_err("failed to create descriptions file for msm-perf-patches\n");
ret = PTR_ERR(file);
goto init_exit;
}
init_exit:
return ret;
}
late_initcall(perf_debugfs_init);