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authorChen, Gong <gong.chen@linux.intel.com>2014-06-11 21:02:20 (GMT)
committerTony Luck <tony.luck@intel.com>2014-06-25 18:22:03 (GMT)
commitd963cd95bea93b7db9390a71d1e2cabbb3b2c3ea (patch)
treeb6d25da65a161f6c38207a2f15515c3b795d3396 /drivers/ras
parent3760cd20402d4c131e1994c968ecb055fa0f74bc (diff)
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>
Diffstat (limited to 'drivers/ras')
-rw-r--r--drivers/ras/Makefile2
-rw-r--r--drivers/ras/debugfs.c56
-rw-r--r--drivers/ras/ras.c14
3 files changed, 71 insertions, 1 deletions
diff --git a/drivers/ras/Makefile b/drivers/ras/Makefile
index 223e806..d7f7334 100644
--- a/drivers/ras/Makefile
+++ b/drivers/ras/Makefile
@@ -1 +1 @@
-obj-$(CONFIG_RAS) += ras.o
+obj-$(CONFIG_RAS) += ras.o debugfs.o
diff --git a/drivers/ras/debugfs.c b/drivers/ras/debugfs.c
new file mode 100644
index 0000000..0322acf
--- /dev/null
+++ b/drivers/ras/debugfs.c
@@ -0,0 +1,56 @@
+#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);
+}
diff --git a/drivers/ras/ras.c b/drivers/ras/ras.c
index b0c6ed1..4cac43a 100644
--- a/drivers/ras/ras.c
+++ b/drivers/ras/ras.c
@@ -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);

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