x86/intel_rdt: Implement show_options() for resctrlfs

Implement show_options() callback for intel resource control filesystem
to expose the active mount options in /proc/

Signed-off-by: Shaohua Li <shli@fb.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/7dce7c1886ac9289442d254ea18322c92bd968da.1480717072.git.shli@fb.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 1afd3f393501c7b164d5f8cd65aa0fb39789e8ba..8af04afdfcb964218e6a4afc392af36179020a7a 100644 (file)
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -1036,9 +1036,17 @@ out:
        return ret;
 }
 
+static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
+{
+       if (rdt_resources_all[RDT_RESOURCE_L3DATA].enabled)
+               seq_puts(seq, ",cdp");
+       return 0;
+}
+
 static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = {
-       .mkdir  = rdtgroup_mkdir,
-       .rmdir  = rdtgroup_rmdir,
+       .mkdir          = rdtgroup_mkdir,
+       .rmdir          = rdtgroup_rmdir,
+       .show_options   = rdtgroup_show_options,
 };
 
 static int __init rdtgroup_setup_root(void)