linux-kernel - [PATCH] x86/intel_rdt: Show missing resctrl mount options

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Date:   Tue,  4 Sep 2018 18:29:44 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "H Peter Anvin" <hpa@...or.com>,
        "Tony Luck" <tony.luck@...el.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, Fenghua Yu <fenghua.yu@...el.com>,
        Xiaochen Shen <xiaochen.shen@...el.com>
Subject: [PATCH] x86/intel_rdt: Show missing resctrl mount options

In resctrl filesystem, we have some mount options to enable
L3/L2 CDP and MBA Software Controller features if platform supports them:
     mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps]] /sys/fs/resctrl

But currently only "cdp" option can be displayed. "cdpl2" and "mba_MBps"
options are not showed even when they are active mount options.

Before this patch:
     #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 this patch:
     #mount -t resctrl resctrl -o cdp,mba_MBps /sys/fs/resctrl
     #grep resctrl /proc/mountts
     /sys/fs/resctrl /sys/fs/resctrl resctrl rw,relatime,cdp,mba_MBps 0 0

Signed-off-by: Xiaochen Shen <xiaochen.shen@...el.com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 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 b799c00bef09..82459a41fa84 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -2760,6 +2760,13 @@ 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;
 }
 
-- 
2.18.0