linux/drivers/ras/debugfs.c
Borislav Petkov (AMD) 9d2b6fa09d RAS: Export helper to get ras_debugfs_dir
Export a getter instead of the debugfs node directly so that, other
in-tree-only RAS modules can use it.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Link: https://lore.kernel.org/r/20240301143748.854090-2-yazen.ghannam@amd.com
2024-03-01 16:55:10 +01:00

66 lines
1.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/debugfs.h>
#include <linux/ras.h>
#include "debugfs.h"
static struct dentry *ras_debugfs_dir;
static atomic_t trace_count = ATOMIC_INIT(0);
struct dentry *ras_get_debugfs_root(void)
{
return ras_debugfs_dir;
}
EXPORT_SYMBOL_GPL(ras_get_debugfs_root);
int ras_userspace_consumers(void)
{
return atomic_read(&trace_count);
}
EXPORT_SYMBOL_GPL(ras_userspace_consumers);
static int trace_show(struct seq_file *m, void *v)
{
return 0;
}
static int trace_open(struct inode *inode, struct file *file)
{
atomic_inc(&trace_count);
return single_open(file, trace_show, NULL);
}
static int trace_release(struct inode *inode, struct file *file)
{
atomic_dec(&trace_count);
return single_release(inode, file);
}
static const struct file_operations trace_fops = {
.open = trace_open,
.read = seq_read,
.llseek = seq_lseek,
.release = trace_release,
};
int __init ras_add_daemon_trace(void)
{
struct dentry *fentry;
if (!ras_debugfs_dir)
return -ENOENT;
fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir,
NULL, &trace_fops);
if (IS_ERR(fentry))
return -ENODEV;
return 0;
}
void __init ras_debugfs_init(void)
{
ras_debugfs_dir = debugfs_create_dir("ras", NULL);
}