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// SPDX-License-Identifier: GPL-2.0
/*
* mm/lmkd_dbg_trigger.c
*
* Copyright (c) 2020-2022 Huawei Technologies Co., Ltd.
*/
#include <linux/atomic.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/oom.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/lowmem_dbg.h>
#define PROC_NUMBUF 8
static int lmkd_oom_score_adj;
static atomic64_t lmkd_no_cma_cnt = ATOMIC64_INIT(0);
static int lmkd_dbg_trigger_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "lmkd_oom_score_adj: %d\n", lmkd_oom_score_adj);
seq_printf(m, "lmkd_no_cma_cnt: %lld\n",
atomic64_read(&lmkd_no_cma_cnt));
return 0;
}
static int lmkd_dbg_trigger_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, lmkd_dbg_trigger_proc_show, NULL);
}
static ssize_t lmkd_dbg_trigger_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char buffer[PROC_NUMBUF];
int oom_score_adj;
int err;
memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count)) {
err = -EFAULT;
goto out;
}
err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
if (err)
goto out;
if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
oom_score_adj > OOM_SCORE_ADJ_MAX) {
err = -EINVAL;
goto out;
}
lmkd_oom_score_adj = oom_score_adj;
lowmem_dbg(oom_score_adj);
out:
return err < 0 ? err : count;
}
static const struct proc_ops lmkd_dbg_trigger_proc_fops = {
.proc_open = lmkd_dbg_trigger_proc_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = single_release,
.proc_write = lmkd_dbg_trigger_write,
};
static int __init proc_lmkd_dbg_trigger_init(void)
{
proc_create("lmkd_dbg_trigger", 0660, NULL,
&lmkd_dbg_trigger_proc_fops);
return 0;
}
fs_initcall(proc_lmkd_dbg_trigger_init);
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