LXR linux/drivers/ras/debugfs.c

   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}
  60