Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 7331822..fc20cde 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -34,7 +34,7 @@
present: cpus that have been identified as being present in
the system.
- See Documentation/cputopology.txt for more information.
+ See Documentation/admin-guide/cputopology.rst for more information.
What: /sys/devices/system/cpu/probe
@@ -103,7 +103,7 @@
thread_siblings_list: human-readable list of cpu#'s hardware
threads within the same core as cpu#
- See Documentation/cputopology.txt for more information.
+ See Documentation/admin-guide/cputopology.rst for more information.
What: /sys/devices/system/cpu/cpuidle/current_driver
@@ -137,7 +137,8 @@
current_governor: (RW) displays current idle policy. Users can
switch the governor at runtime by writing to this file.
- See files in Documentation/cpuidle/ for more information.
+ See Documentation/admin-guide/pm/cpuidle.rst and
+ Documentation/driver-api/pm/cpuidle.rst for more information.
What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/name
@@ -145,6 +146,8 @@
/sys/devices/system/cpu/cpuX/cpuidle/stateN/power
/sys/devices/system/cpu/cpuX/cpuidle/stateN/time
/sys/devices/system/cpu/cpuX/cpuidle/stateN/usage
+ /sys/devices/system/cpu/cpuX/cpuidle/stateN/above
+ /sys/devices/system/cpu/cpuX/cpuidle/stateN/below
Date: September 2007
KernelVersion: v2.6.24
Contact: Linux power management list <linux-pm@vger.kernel.org>
@@ -166,6 +169,11 @@
usage: (RO) Number of times this state was entered (a count).
+ above: (RO) Number of times this state was entered, but the
+ observed CPU idle duration was too short for it (a count).
+
+ below: (RO) Number of times this state was entered, but the
+ observed CPU idle duration was too long for it (a count).
What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/desc
Date: February 2008
@@ -477,6 +485,9 @@
/sys/devices/system/cpu/vulnerabilities/spectre_v2
/sys/devices/system/cpu/vulnerabilities/spec_store_bypass
/sys/devices/system/cpu/vulnerabilities/l1tf
+ /sys/devices/system/cpu/vulnerabilities/mds
+ /sys/devices/system/cpu/vulnerabilities/tsx_async_abort
+ /sys/devices/system/cpu/vulnerabilities/itlb_multihit
Date: January 2018
Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
Description: Information about CPU vulnerabilities
@@ -489,8 +500,7 @@
"Vulnerable" CPU is affected and no mitigation in effect
"Mitigation: $M" CPU is affected and mitigation $M is in effect
- Details about the l1tf file can be found in
- Documentation/admin-guide/l1tf.rst
+ See also: Documentation/admin-guide/hw-vuln/index.rst
What: /sys/devices/system/cpu/smt
/sys/devices/system/cpu/smt/active
@@ -504,10 +514,63 @@
control: Read/write interface to control SMT. Possible
values:
- "on" SMT is enabled
- "off" SMT is disabled
- "forceoff" SMT is force disabled. Cannot be changed.
- "notsupported" SMT is not supported by the CPU
+ "on" SMT is enabled
+ "off" SMT is disabled
+ "forceoff" SMT is force disabled. Cannot be changed.
+ "notsupported" SMT is not supported by the CPU
+ "notimplemented" SMT runtime toggling is not
+ implemented for the architecture
If control status is "forceoff" or "notsupported" writes
are rejected.
+
+What: /sys/devices/system/cpu/cpu#/power/energy_perf_bias
+Date: March 2019
+Contact: linux-pm@vger.kernel.org
+Description: Intel Energy and Performance Bias Hint (EPB)
+
+ EPB for the given CPU in a sliding scale 0 - 15, where a value
+ of 0 corresponds to a hint preference for highest performance
+ and a value of 15 corresponds to the maximum energy savings.
+
+ In order to change the EPB value for the CPU, write either
+ a number in the 0 - 15 sliding scale above, or one of the
+ strings: "performance", "balance-performance", "normal",
+ "balance-power", "power" (that represent values reflected by
+ their meaning), to this attribute.
+
+ This attribute is present for all online CPUs supporting the
+ Intel EPB feature.
+
+What: /sys/devices/system/cpu/umwait_control
+ /sys/devices/system/cpu/umwait_control/enable_c02
+ /sys/devices/system/cpu/umwait_control/max_time
+Date: May 2019
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description: Umwait control
+
+ enable_c02: Read/write interface to control umwait C0.2 state
+ Read returns C0.2 state status:
+ 0: C0.2 is disabled
+ 1: C0.2 is enabled
+
+ Write 'y' or '1' or 'on' to enable C0.2 state.
+ Write 'n' or '0' or 'off' to disable C0.2 state.
+
+ The interface is case insensitive.
+
+ max_time: Read/write interface to control umwait maximum time
+ in TSC-quanta that the CPU can reside in either C0.1
+ or C0.2 state. The time is an unsigned 32-bit number.
+ Note that a value of zero means there is no limit.
+ Low order two bits must be zero.
+
+What: /sys/devices/system/cpu/svm
+Date: August 2019
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+ Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
+Description: Secure Virtual Machine
+
+ If 1, it means the system is using the Protected Execution
+ Facility in POWER9 and newer processors. i.e., it is a Secure
+ Virtual Machine.