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linux/drivers/ras/debugfs.c
Chen, Gong d963cd95be RAS, debugfs: Add debugfs interface for RAS subsystem
Implement a new debugfs interface for RAS susbsystem.
A file named daemon_active is added there accordingly.
This file is used to track if user space daemon accesses
perf/trace interface or not. One can track which daemon
opens it via "lsof /path/to/debugfs/ras/daemon_active".

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Link: http://lkml.kernel.org/r/1402475691-30045-5-git-send-email-gong.chen@linux.intel.com
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2014-06-25 11:22:03 -07:00

57 lines
1.1 KiB
C

#include <linux/debugfs.h>
static struct dentry *ras_debugfs_dir;
static atomic_t trace_count = ATOMIC_INIT(0);
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 atomic_read(&trace_count);
}
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 (!fentry)
return -ENODEV;
return 0;
}
void __init ras_debugfs_init(void)
{
ras_debugfs_dir = debugfs_create_dir("ras", NULL);
}