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>,
"Peter Zijlstra" <peterz@infradead.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Dave Hansen" <dave.hansen@intel.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krcmar" <rkrcmar@redhat.com>,
"Christopherson Sean J" <sean.j.christopherson@intel.com>,
"Ashok Raj" <ashok.raj@intel.com>,
"Tony Luck" <tony.luck@intel.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Xiaoyao Li " <xiaoyao.li@intel.com>,
"Sai Praneeth Prakhya" <sai.praneeth.prakhya@intel.com>,
"Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: "linux-kernel" <linux-kernel@vger.kernel.org>,
"x86" <x86@kernel.org>,
kvm@vger.kernel.org, Fenghua Yu <fenghua.yu@intel.com>
Subject: [PATCH v9 15/17] x86/split_lock: Add documentation for split lock detection interface
Date: Tue, 18 Jun 2019 15:41:17 -0700 [thread overview]
Message-ID: <1560897679-228028-16-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1560897679-228028-1-git-send-email-fenghua.yu@intel.com>
It is useful for development and debugging to document the new debugfs
interface /sys/kernel/debug/x86/split_lock_detect.
A new debugfs documentation is created to describe the split lock detection
interface. In the future, more entries may be added in the documentation to
describe other interfaces under /sys/kernel/debug/x86 directory.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
Documentation/ABI/testing/debugfs-x86 | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
create mode 100644 Documentation/ABI/testing/debugfs-x86
diff --git a/Documentation/ABI/testing/debugfs-x86 b/Documentation/ABI/testing/debugfs-x86
new file mode 100644
index 000000000000..17a1e9ed6712
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-x86
@@ -0,0 +1,21 @@
+What: /sys/kernel/debugfs/x86/split_lock_detect
+Date: May 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.
--
2.19.1
next prev parent reply other threads:[~2019-06-18 22:51 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-18 22:41 [PATCH v9 00/17] x86/split_lock: Enable split lock detection Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 01/17] x86/common: Align cpu_caps_cleared and cpu_caps_set to unsigned long Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 02/17] drivers/net/b44: Align pwol_mask to unsigned long for better performance Fenghua Yu
2019-06-24 15:12 ` David Laight
2019-06-24 18:43 ` Paolo Bonzini
2019-06-18 22:41 ` [PATCH v9 03/17] x86/split_lock: Align x86_capability to unsigned long to avoid split locked access Fenghua Yu
2019-06-24 15:12 ` David Laight
2019-06-25 23:54 ` Fenghua Yu
2019-06-26 19:15 ` Thomas Gleixner
2019-06-18 22:41 ` [PATCH v9 04/17] x86/msr-index: Define MSR_IA32_CORE_CAP and split lock detection bit Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 05/17] x86/cpufeatures: Enumerate MSR_IA32_CORE_CAP Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 06/17] x86/split_lock: Enumerate split lock detection by MSR_IA32_CORE_CAP Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 07/17] x86/split_lock: Enumerate split lock detection on Icelake mobile processor Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 08/17] x86/split_lock: Define MSR TEST_CTL register Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 09/17] x86/split_lock: Handle #AC exception for split lock Fenghua Yu
2019-06-26 20:20 ` Thomas Gleixner
2019-06-26 20:36 ` Fenghua Yu
2019-06-26 21:47 ` Thomas Gleixner
2019-09-25 18:09 ` Sean Christopherson
2019-10-16 6:58 ` Xiaoyao Li
2019-10-16 9:29 ` Thomas Gleixner
2019-10-16 15:59 ` Sean Christopherson
2019-10-16 9:40 ` Paolo Bonzini
2019-10-16 9:47 ` Thomas Gleixner
2019-10-16 10:16 ` Paolo Bonzini
2019-10-16 11:23 ` Xiaoyao Li
2019-10-16 11:26 ` Paolo Bonzini
2019-10-16 13:13 ` Xiaoyao Li
2019-10-16 14:43 ` Thomas Gleixner
2019-10-16 15:37 ` Paolo Bonzini
2019-10-16 16:25 ` Xiaoyao Li
2019-10-16 16:38 ` Paolo Bonzini
2019-10-17 12:29 ` [RFD] x86/split_lock: Request to Intel Thomas Gleixner
2019-10-17 17:23 ` Sean Christopherson
2019-10-17 21:31 ` Thomas Gleixner
2019-10-17 23:38 ` Sean Christopherson
2019-10-17 23:28 ` Luck, Tony
2019-10-18 10:45 ` David Laight
2019-10-18 21:03 ` hpa
2019-10-18 2:36 ` Xiaoyao Li
2019-10-18 9:02 ` Thomas Gleixner
2019-10-18 10:20 ` Xiaoyao Li
2019-10-18 10:43 ` Peter Zijlstra
2019-10-16 11:49 ` [PATCH v9 09/17] x86/split_lock: Handle #AC exception for split lock Thomas Gleixner
2019-10-16 11:58 ` Paolo Bonzini
2019-10-16 13:51 ` Xiaoyao Li
2019-10-16 14:08 ` Paolo Bonzini
2019-10-16 14:14 ` David Laight
2019-10-16 15:03 ` Thomas Gleixner
2019-10-16 15:41 ` Sean Christopherson
2019-10-16 15:43 ` Paolo Bonzini
2019-10-16 16:23 ` Sean Christopherson
2019-10-16 17:42 ` Sean Christopherson
2019-10-17 1:23 ` Xiaoyao Li
2019-10-21 13:06 ` Paolo Bonzini
2019-10-21 13:03 ` Paolo Bonzini
2019-10-21 13:02 ` Paolo Bonzini
2019-10-16 14:50 ` Thomas Gleixner
2019-06-18 22:41 ` [PATCH v9 10/17] kvm/x86: Emulate MSR IA32_CORE_CAPABILITY Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 11/17] kvm/vmx: Emulate MSR TEST_CTL Fenghua Yu
2019-06-27 2:24 ` Xiaoyao Li
2019-06-27 7:12 ` Thomas Gleixner
2019-06-27 7:58 ` Xiaoyao Li
2019-06-27 12:11 ` Thomas Gleixner
2019-06-27 12:22 ` Xiaoyao Li
2019-06-18 22:41 ` [PATCH v9 12/17] x86/split_lock: Enable split lock detection by default Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 13/17] x86/split_lock: Disable split lock detection by kernel parameter "nosplit_lock_detect" Fenghua Yu
2019-06-26 20:34 ` Thomas Gleixner
2019-06-26 20:37 ` Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 14/17] x86/split_lock: Add a debugfs interface to enable/disable split lock detection during run time Fenghua Yu
2019-06-26 21:37 ` Thomas Gleixner
2019-06-18 22:41 ` Fenghua Yu [this message]
2019-06-26 21:51 ` [PATCH v9 15/17] x86/split_lock: Add documentation for split lock detection interface Thomas Gleixner
2019-06-18 22:41 ` [PATCH v9 16/17] x86/split_lock: Reorganize few header files in order to call WARN_ON_ONCE() in atomic bit ops Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 17/17] x86/split_lock: Warn on unaligned address in atomic bit operations Fenghua Yu
2019-06-26 22:00 ` Thomas Gleixner
2019-09-16 22:39 ` [PATCH 0/3] Fix some 4-byte vs. 8-byte alignment issues Tony Luck
2019-09-16 22:39 ` [PATCH 1/3] x86/common: Align cpu_caps_cleared and cpu_caps_set to unsigned long Tony Luck
2019-11-15 19:26 ` [tip: x86/cpu] x86/cpu: " tip-bot2 for Fenghua Yu
2019-09-16 22:39 ` [PATCH 2/3] drivers/net/b44: Align pwol_mask to unsigned long for better performance Tony Luck
2019-09-16 22:39 ` [PATCH 3/3] x86/split_lock: Align the x86_capability array to size of unsigned long Tony Luck
2019-09-17 8:29 ` David Laight
2019-09-17 19:14 ` Luck, Tony
2019-09-18 8:54 ` David Laight
2019-11-15 19:26 ` [tip: x86/cpu] x86/cpu: " tip-bot2 for Fenghua Yu
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