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From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Borislav Petkov" <bp@alien8.de>, "H Peter Anvin" <hpa@zytor.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Dave Hansen" <dave.hansen@intel.com>,
	"Ashok Raj" <ashok.raj@intel.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Ravi V Shankar" <ravi.v.shankar@intel.com>,
	"Xiaoyao Li " <xiaoyao.li@intel.com>,
	"Christopherson Sean J" <sean.j.christopherson@intel.com>,
	"Kalle Valo" <kvalo@codeaurora.org>,
	"Michael Chan" <michael.chan@broadcom.com>
Cc: "linux-kernel" <linux-kernel@vger.kernel.org>,
	"x86" <x86@kernel.org>,
	kvm@vger.kernel.org, netdev@vger.kernel.org,
	linux-wireless@vger.kernel.org, Fenghua Yu <fenghua.yu@intel.com>
Subject: [PATCH v7 16/21] x86/split_lock: Document the new sysfs file for split lock detection
Date: Wed, 17 Apr 2019 14:34:06 -0700	[thread overview]
Message-ID: <1555536851-17462-17-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1555536851-17462-1-git-send-email-fenghua.yu@intel.com>

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

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
 .../ABI/testing/sysfs-devices-system-cpu      | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 9605dbd4b5b5..aad7b1698065 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -67,6 +67,28 @@ 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@vger.kernel.org>
+Description:	(RW) Control split lock detection on Intel Tremont and
+		future CPUs
+
+		Reads return split lock detection status:
+			0: disabled
+			1: enabled
+
+		Writes enable or disable split lock detection:
+			The first character is one of 'Nn0' or [oO][fF] for off
+			disables the feature.
+			The first character is one of 'Yy1' or [oO][nN] for on
+			enables the feature.
+
+		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


  parent reply	other threads:[~2019-04-17 21:43 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-17 21:33 [PATCH v7 00/21] x86/split_lock: Enable split lock detection Fenghua Yu
2019-04-17 21:33 ` [PATCH v7 01/21] x86/common: Align cpu_caps_cleared and cpu_caps_set to unsigned long Fenghua Yu
2019-04-17 21:33 ` [PATCH v7 02/21] drivers/net/b44: Align pwol_mask to unsigned long for better performance Fenghua Yu
2019-04-17 21:33 ` [PATCH v7 03/21] wlcore: simplify/fix/optimize reg_ch_conf_pending operations Fenghua Yu
2019-04-17 21:33 ` [PATCH v7 04/21] x86/split_lock: Align x86_capability to unsigned long to avoid split locked access Fenghua Yu
2019-04-18  9:20   ` David Laight
2019-04-18 11:08     ` David Laight
2019-04-18 11:49       ` Thomas Gleixner
2019-04-18 13:14         ` David Laight
2019-04-18 13:26           ` David Laight
2019-04-17 21:33 ` [PATCH v7 05/21] x86/msr-index: Define MSR_IA32_CORE_CAPABILITY and split lock detection bit Fenghua Yu
2019-04-17 21:33 ` [PATCH v7 06/21] x86/cpufeatures: Enumerate MSR_IA32_CORE_CAPABILITY Fenghua Yu
2019-04-17 21:33 ` [PATCH v7 07/21] x86/split_lock: Enumerate split lock detection by MSR_IA32_CORE_CAPABILITY Fenghua Yu
2019-04-17 21:33 ` [PATCH v7 08/21] x86/split_lock: Enumerate split lock detection on Icelake mobile processor Fenghua Yu
2019-04-17 21:33 ` [PATCH v7 09/21] x86/split_lock: Define MSR TEST_CTL register Fenghua Yu
2019-04-17 21:34 ` [PATCH v7 10/21] x86/split_lock: Define per CPU variable to cache MSR TEST_CTL Fenghua Yu
2019-04-17 22:14   ` Thomas Gleixner
2019-04-18  1:28     ` Fenghua Yu
2019-04-18  6:31       ` Thomas Gleixner
2019-04-17 21:34 ` [PATCH v7 11/21] x86/split_lock: Handle #AC exception for split lock Fenghua Yu
2019-04-17 21:34 ` [PATCH v7 12/21] kvm/x86: Emulate MSR IA32_CORE_CAPABILITY Fenghua Yu
2019-04-17 21:34 ` [PATCH v7 13/21] kvm/vmx: Emulate MSR TEST_CTL Fenghua Yu
2019-04-17 21:34 ` [PATCH v7 14/21] x86/split_lock: Enable split lock detection by default Fenghua Yu
2019-04-17 22:41   ` Thomas Gleixner
2019-04-17 21:34 ` [PATCH v7 15/21] x86/split_lock: Add a sysfs interface to enable/disable split lock detection during run time Fenghua Yu
2019-04-17 22:47   ` Thomas Gleixner
2019-04-18  0:57     ` Fenghua Yu
2019-04-18  6:41       ` Thomas Gleixner
2019-04-23 20:48         ` Fenghua Yu
2019-04-24 13:45           ` David Laight
2019-04-17 21:34 ` Fenghua Yu [this message]
2019-04-17 21:34 ` [PATCH v7 17/21] x86/clearcpuid: Support multiple clearcpuid options Fenghua Yu
2019-04-17 23:05   ` Thomas Gleixner
2019-04-17 21:34 ` [PATCH v7 18/21] x86/clearcpuid: Support feature flag string in kernel option clearcpuid Fenghua Yu
2019-04-17 23:19   ` Thomas Gleixner
2019-04-17 23:47     ` Fenghua Yu
2019-04-18  6:16       ` Thomas Gleixner
2019-04-17 21:34 ` [PATCH v7 19/21] x86/clearcpuid: Apply cleared feature bits that are forced set before Fenghua Yu
2019-04-17 21:34 ` [PATCH v7 20/21] x86/clearcpuid: Clear CPUID bit in CPUID faulting Fenghua Yu
2019-04-17 21:34 ` [PATCH v7 21/21] x86/clearcpuid: Change document for kernel option clearcpuid Fenghua Yu

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