79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
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/* arch/arm/mach-msm/htc_set_perflock.c
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*
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* Copyright (C) 2008 HTC Corporation
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* Author: Eiven Peng <eiven_peng@htc.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/miscdevice.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/uaccess.h>
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#include <mach/perflock.h>
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static struct mutex lock;
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static struct perf_lock media_perf_lock;
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static uint32_t num = 0;
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static int perflock_open(struct inode *inode, struct file *file)
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{
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mutex_lock(&lock);
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if (num == 0) {
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perf_lock(&media_perf_lock);
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printk(KERN_DEBUG "[perflock] Perflock enabled.\n");
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}
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num++;
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printk(KERN_DEBUG "[perflock] Perflock node is opened by [%s]/[PID=%d],numbers of opened nodes = [%d].\n",
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current->comm, current->pid, num);
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mutex_unlock(&lock);
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return 0;
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}
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static int perflock_release(struct inode *inode, struct file *file)
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{
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mutex_lock(&lock);
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num--;
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printk(KERN_DEBUG "[perflock] Perflock node is closed by [%s]/[PID=%d], numbers of opened nodes = [%d].\n",
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current->comm, current->pid, num);
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if (num == 0) {
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perf_unlock(&media_perf_lock);
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printk(KERN_DEBUG "[perflock] Perflock disabled.\n");
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}
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mutex_unlock(&lock);
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return 0;
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}
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static struct file_operations perflock_fops = {
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.owner = THIS_MODULE,
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.open = perflock_open,
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.release = perflock_release,
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};
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struct miscdevice perflock_misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "perflock",
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.fops = &perflock_fops,
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};
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static int __init set_perflock_init(void) {
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mutex_init(&lock);
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perf_lock_init(&media_perf_lock, PERF_LOCK_HIGHEST, "media");
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return misc_register(&perflock_misc);
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}
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device_initcall(set_perflock_init);
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