linux-kernel - [PATCH AUTOSEL 4.18 033/126] x86/intel_rdt: Show missing resctrl mount options

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Message-Id: <20181031230754.29029-33-sashal@kernel.org>
Date:   Wed, 31 Oct 2018 19:06:21 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Xiaochen Shen <xiaochen.shen@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H Peter Anvin" <hpa@...or.com>, "Tony Luck" <tony.luck@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.18 033/126] x86/intel_rdt: Show missing resctrl mount options

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

[ Upstream commit 2cc81c6992248ea37d0241bc325977bab310bc3b ]

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@...el.com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: "H Peter Anvin" <hpa@...or.com>
Cc: "Tony Luck" <tony.luck@...el.com>
Link: https://lkml.kernel.org/r/1536796118-60135-1-git-send-email-fenghua.yu@intel.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 749856a2e736..bc3801985d73 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -2032,6 +2032,13 @@ 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;
 }
 
-- 
2.17.1