debugfs.c (1174B)
1// SPDX-License-Identifier: GPL-2.0-only 2#include <linux/debugfs.h> 3#include <linux/ras.h> 4#include "debugfs.h" 5 6struct dentry *ras_debugfs_dir; 7 8static atomic_t trace_count = ATOMIC_INIT(0); 9 10int ras_userspace_consumers(void) 11{ 12 return atomic_read(&trace_count); 13} 14EXPORT_SYMBOL_GPL(ras_userspace_consumers); 15 16static int trace_show(struct seq_file *m, void *v) 17{ 18 return atomic_read(&trace_count); 19} 20 21static int trace_open(struct inode *inode, struct file *file) 22{ 23 atomic_inc(&trace_count); 24 return single_open(file, trace_show, NULL); 25} 26 27static int trace_release(struct inode *inode, struct file *file) 28{ 29 atomic_dec(&trace_count); 30 return single_release(inode, file); 31} 32 33static const struct file_operations trace_fops = { 34 .open = trace_open, 35 .read = seq_read, 36 .llseek = seq_lseek, 37 .release = trace_release, 38}; 39 40int __init ras_add_daemon_trace(void) 41{ 42 struct dentry *fentry; 43 44 if (!ras_debugfs_dir) 45 return -ENOENT; 46 47 fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir, 48 NULL, &trace_fops); 49 if (!fentry) 50 return -ENODEV; 51 52 return 0; 53 54} 55 56void __init ras_debugfs_init(void) 57{ 58 ras_debugfs_dir = debugfs_create_dir("ras", NULL); 59}