From: Xiaochen Shen <xiaochen.shen@intel.com>

Date: Wed, 12 Sep 2018 16:48:38 -0700

Subject: x86/intel_rdt: Show missing resctrl mount options

Git-commit: 2cc81c6992248ea37d0241bc325977bab310bc3b

Patch-mainline: v4.20-rc1

References: fate#325749

In resctrl filesystem, mount options exist to enable L3/L2 CDP and MBA

Software Controller features if the platform supports them:

 mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps]] /sys/fs/resctrl

But currently only "cdp" option is displayed in /proc/mounts. "cdpl2" and

"mba_MBps" options are not shown even when they are active.

Before:

 # mount -t resctrl resctrl -o cdp,mba_MBps /sys/fs/resctrl

 # grep resctrl /proc/mounts

 /sys/fs/resctrl /sys/fs/resctrl resctrl rw,relatime,cdp 0 0

After:

 # mount -t resctrl resctrl -o cdp,mba_MBps /sys/fs/resctrl

 # grep resctrl /proc/mounts

 /sys/fs/resctrl /sys/fs/resctrl resctrl rw,relatime,cdp,mba_MBps 0 0

Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Cc: "H Peter Anvin" <hpa@zytor.com>

Cc: "Tony Luck" <tony.luck@intel.com>

Link: https://lkml.kernel.org/r/1536796118-60135-1-git-send-email-fenghua.yu@intel.com

Acked-by: Borislav Petkov <bp@suse.de>

---

 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 7 +++++++

 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c

index 1b8e86a5d5e1..82a487840eb2 100644

--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c

+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c

@@ -2795,6 +2795,13 @@ static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)

 {

 	if (rdt_resources_all[RDT_RESOURCE_L3DATA].alloc_enabled)

 		seq_puts(seq, ",cdp");

+

+	if (rdt_resources_all[RDT_RESOURCE_L2DATA].alloc_enabled)

+		seq_puts(seq, ",cdpl2");

+

+	if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA]))

+		seq_puts(seq, ",mba_MBps");

+

 	return 0;

 }