Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/ras.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include "debugfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) struct dentry *ras_debugfs_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) static atomic_t trace_count = ATOMIC_INIT(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) int ras_userspace_consumers(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	return atomic_read(&trace_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) EXPORT_SYMBOL_GPL(ras_userspace_consumers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static int trace_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	return atomic_read(&trace_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static int trace_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	atomic_inc(&trace_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	return single_open(file, trace_show, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static int trace_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	atomic_dec(&trace_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	return single_release(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static const struct file_operations trace_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	.open    = trace_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	.read    = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	.llseek  = seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	.release = trace_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) int __init ras_add_daemon_trace(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	struct dentry *fentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	if (!ras_debugfs_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 				     NULL, &trace_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	if (!fentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) void __init ras_debugfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	ras_debugfs_dir = debugfs_create_dir("ras", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }