Commit d963cd95 authored by Chen, Gong's avatar Chen, Gong Committed by Tony Luck

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: default avatarChen, Gong <gong.chen@linux.intel.com>
Link: http://lkml.kernel.org/r/1402475691-30045-5-git-send-email-gong.chen@linux.intel.comSigned-off-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 3760cd20
obj-$(CONFIG_RAS) += ras.o
obj-$(CONFIG_RAS) += ras.o debugfs.o
#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);
}
......@@ -5,8 +5,22 @@
* Chen, Gong <gong.chen@linux.intel.com>
*/
#include <linux/init.h>
#include <linux/ras.h>
#define CREATE_TRACE_POINTS
#define TRACE_INCLUDE_PATH ../../include/ras
#include <ras/ras_event.h>
static int __init ras_init(void)
{
int rc = 0;
ras_debugfs_init();
rc = ras_add_daemon_trace();
return rc;
}
subsys_initcall(ras_init);
EXPORT_TRACEPOINT_SYMBOL_GPL(mc_event);
#ifndef __RAS_H__
#define __RAS_H__
#ifdef CONFIG_DEBUG_FS
int ras_userspace_consumers(void);
void ras_debugfs_init(void);
int ras_add_daemon_trace(void);
#else
static inline int ras_userspace_consumers(void) { return 0; }
static inline void ras_debugfs_init(void) { return; }
static inline int ras_add_daemon_trace(void) { return 0; }
#endif
#endif
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