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1// SPDX-License-Identifier: GPL-2.0-only2#include <linux/debugfs.h>3#include <linux/ras.h>4#include "debugfs.h"5 6static struct dentry *ras_debugfs_dir;7 8static atomic_t trace_count = ATOMIC_INIT(0);9 10struct dentry *ras_get_debugfs_root(void)11{12 return ras_debugfs_dir;13}14EXPORT_SYMBOL_GPL(ras_get_debugfs_root);15 16int ras_userspace_consumers(void)17{18 return atomic_read(&trace_count);19}20EXPORT_SYMBOL_GPL(ras_userspace_consumers);21 22static int trace_show(struct seq_file *m, void *v)23{24 return 0;25}26 27static int trace_open(struct inode *inode, struct file *file)28{29 atomic_inc(&trace_count);30 return single_open(file, trace_show, NULL);31}32 33static int trace_release(struct inode *inode, struct file *file)34{35 atomic_dec(&trace_count);36 return single_release(inode, file);37}38 39static const struct file_operations trace_fops = {40 .open = trace_open,41 .read = seq_read,42 .llseek = seq_lseek,43 .release = trace_release,44};45 46int __init ras_add_daemon_trace(void)47{48 struct dentry *fentry;49 50 if (!ras_debugfs_dir)51 return -ENOENT;52 53 fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir,54 NULL, &trace_fops);55 if (IS_ERR(fentry))56 return -ENODEV;57 58 return 0;59 60}61 62void __init ras_debugfs_init(void)63{64 ras_debugfs_dir = debugfs_create_dir("ras", NULL);65}66