diff options
author | Chen, Gong <gong.chen@linux.intel.com> | 2014-06-11 23:02:20 +0200 |
---|---|---|
committer | Tony Luck <tony.luck@intel.com> | 2014-06-25 20:22:03 +0200 |
commit | d963cd95bea93b7db9390a71d1e2cabbb3b2c3ea (patch) | |
tree | b6d25da65a161f6c38207a2f15515c3b795d3396 /drivers/ras/debugfs.c | |
parent | CPER: Adjust code flow of some functions (diff) | |
download | linux-d963cd95bea93b7db9390a71d1e2cabbb3b2c3ea.tar.xz linux-d963cd95bea93b7db9390a71d1e2cabbb3b2c3ea.zip |
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/debugfs.c')
-rw-r--r-- | drivers/ras/debugfs.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/ras/debugfs.c b/drivers/ras/debugfs.c new file mode 100644 index 000000000000..0322acf67ea5 --- /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); +} |