netdev - [PATCH v6 15/20] x86/split_lock: Document the new sysfs file for split lock detection

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Message-Id: <1554326526-172295-16-git-send-email-fenghua.yu@intel.com>
Date:   Wed,  3 Apr 2019 14:22:01 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "H Peter Anvin" <hpa@...or.com>,
        "Dave Hansen" <dave.hansen@...el.com>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        "Ashok Raj" <ashok.raj@...el.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Kalle Valo" <kvalo@...eaurora.org>,
        "Xiaoyao Li " <xiaoyao.li@...el.com>,
        "Michael Chan" <michael.chan@...adcom.com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, kvm@...r.kernel.org,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v6 15/20] x86/split_lock: Document the new sysfs file for split lock detection

Add an ABI document entry for /sys/devices/system/cpu/split_lock_detect.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 .../ABI/testing/sysfs-devices-system-cpu          | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 9605dbd4b5b5..a4e8c2e2e1ac 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -67,6 +67,21 @@ Description:	Discover NUMA node a CPU belongs to
 		/sys/devices/system/cpu/cpu42/node2 -> ../../node/node2
 
 
+What:		/sys/devices/system/cpu/split_lock_detect
+Date:		March 2019
+Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
+Description:	Control split lock detection on Intel Tremont and future CPUs
+
+		Read/write interface to control split lock detection:
+			"0"	disable split lock detection on all CPUs
+			"1"	enable split lock detection on all CPUs
+
+		Please note the interface only shows or controls global setting.
+		During run time, split lock detection on one CPU may be
+		disabled if split lock operation in kernel code happens on
+		the CPU. The interface doesn't show or control split lock
+		detection on individual CPU.
+
 What:		/sys/devices/system/cpu/cpu#/topology/core_id
 		/sys/devices/system/cpu/cpu#/topology/core_siblings
 		/sys/devices/system/cpu/cpu#/topology/core_siblings_list
-- 
2.19.1