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

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.com


Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 3760cd20

drivers/ras/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-$(CONFIG_RAS) += ras.o
 
obj-$(CONFIG_RAS) += ras.o debugfs.o

drivers/ras/debugfs.c

0 → 100644
+56 −0
Original line number Diff line number Diff line 
#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);

}

drivers/ras/ras.c

+14 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/ras.h

0 → 100644
+14 −0
Original line number Diff line number Diff line 
#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