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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2023-02-15 17:18:08 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2023-02-15 17:18:08 +0100
commitbadf1f90502d3fc627a18880dfafd8c636699baf (patch)
treed069f30768766fa721b6f311351de2e0df53f8c1 /Documentation
parentc3bd6d539f34784b235c7070edba978f67516372 (diff)
parentfef1f0be10c61dd16fd370964c316c399483448f (diff)
Merge branch 'thermal-intel'
Merge thermal control changes related to Intel platforms for 6.3-rc1: - Rework ACPI helper functions for thermal control to retrieve a trip point temperature instead of initializing a trip point objetc (Rafael Wysocki). - Clean up and improve the int340x thermal driver ((Rafael Wysocki). - Simplify and clean up the intel_pch thermal driver ((Rafael Wysocki). - Fix the Intel powerclamp thermal driver and make it use the common idle injection framework (Srinivas Pandruvada). - Add two module parameters, cpumask and max_idle, to the Intel powerclamp thermal driver to allow it to affect only a specific subset of CPUs instead of all of them (Srinivas Pandruvada). - Make the Intel quark_dts thermal driver Use generic trip point objects instead of its own trip point representation (Daniel Lezcano). - Add toctree entry for thermal documents and fix two issues in the Intel powerclamp driver documentation (Bagas Sanjaya). * thermal-intel: (25 commits) Documentation: powerclamp: Fix numbered lists formatting Documentation: powerclamp: Escape wildcard in cpumask description Documentation: admin-guide: Add toctree entry for thermal docs thermal: intel: powerclamp: Add two module parameters Documentation: admin-guide: Move intel_powerclamp documentation thermal: intel: powerclamp: Fix duration module parameter thermal: intel: powerclamp: Return last requested state as cur_state thermal: intel: quark_dts: Use generic trip points thermal: intel: powerclamp: Use powercap idle-inject feature powercap: idle_inject: Add update callback powercap: idle_inject: Export symbols thermal: intel: powerclamp: Fix cur_state for multi package system thermal: intel: intel_pch: Drop struct board_info thermal: intel: intel_pch: Rename board ID symbols thermal: intel: intel_pch: Fold suspend and resume routines into their callers thermal: intel: intel_pch: Fold two functions into their callers thermal: intel: intel_pch: Eliminate device operations object thermal: intel: intel_pch: Rename device operations callbacks thermal: intel: intel_pch: Eliminate redundant return pointers thermal: intel: intel_pch: Make pch_wpt_add_acpi_psv_trip() return int ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/admin-guide/index.rst1
-rw-r--r--Documentation/admin-guide/thermal/index.rst8
-rw-r--r--Documentation/admin-guide/thermal/intel_powerclamp.rst (renamed from Documentation/driver-api/thermal/intel_powerclamp.rst)35
-rw-r--r--Documentation/driver-api/thermal/index.rst1
4 files changed, 39 insertions, 6 deletions
diff --git a/Documentation/admin-guide/index.rst b/Documentation/admin-guide/index.rst
index 5bfafcbb9562..0571938ecdc8 100644
--- a/Documentation/admin-guide/index.rst
+++ b/Documentation/admin-guide/index.rst
@@ -116,6 +116,7 @@ configure specific aspects of kernel behavior to your liking.
svga
syscall-user-dispatch
sysrq
+ thermal/index
thunderbolt
ufs
unicode
diff --git a/Documentation/admin-guide/thermal/index.rst b/Documentation/admin-guide/thermal/index.rst
new file mode 100644
index 000000000000..193b7b01a87d
--- /dev/null
+++ b/Documentation/admin-guide/thermal/index.rst
@@ -0,0 +1,8 @@
+=================
+Thermal Subsystem
+=================
+
+.. toctree::
+ :maxdepth: 1
+
+ intel_powerclamp
diff --git a/Documentation/driver-api/thermal/intel_powerclamp.rst b/Documentation/admin-guide/thermal/intel_powerclamp.rst
index 3f6dfb0b3ea6..3ce96043af17 100644
--- a/Documentation/driver-api/thermal/intel_powerclamp.rst
+++ b/Documentation/admin-guide/thermal/intel_powerclamp.rst
@@ -26,6 +26,8 @@ By:
- Generic Thermal Layer (sysfs)
- Kernel APIs (TBD)
+ (*) Module Parameters
+
INTRODUCTION
============
@@ -153,13 +155,15 @@ b) determine the amount of compensation needed at each target ratio
Compensation to each target ratio consists of two parts:
a) steady state error compensation
- This is to offset the error occurring when the system can
- enter idle without extra wakeups (such as external interrupts).
+
+ This is to offset the error occurring when the system can
+ enter idle without extra wakeups (such as external interrupts).
b) dynamic error compensation
- When an excessive amount of wakeups occurs during idle, an
- additional idle ratio can be added to quiet interrupts, by
- slowing down CPU activities.
+
+ When an excessive amount of wakeups occurs during idle, an
+ additional idle ratio can be added to quiet interrupts, by
+ slowing down CPU activities.
A debugfs file is provided for the user to examine compensation
progress and results, such as on a Westmere system::
@@ -281,6 +285,7 @@ cur_state returns value -1 instead of 0 which is to avoid confusing
100% busy state with the disabled state.
Example usage:
+
- To inject 25% idle time::
$ sudo sh -c "echo 25 > /sys/class/thermal/cooling_device80/cur_state
@@ -318,3 +323,23 @@ device, a PID based userspace thermal controller can manage to
control CPU temperature effectively, when no other thermal influence
is added. For example, a UltraBook user can compile the kernel under
certain temperature (below most active trip points).
+
+Module Parameters
+=================
+
+``cpumask`` (RW)
+ A bit mask of CPUs to inject idle. The format of the bitmask is same as
+ used in other subsystems like in /proc/irq/\*/smp_affinity. The mask is
+ comma separated 32 bit groups. Each CPU is one bit. For example for a 256
+ CPU system the full mask is:
+ ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff
+
+ The rightmost mask is for CPU 0-32.
+
+``max_idle`` (RW)
+ Maximum injected idle time to the total CPU time ratio in percent range
+ from 1 to 100. Even if the cooling device max_state is always 100 (100%),
+ this parameter allows to add a max idle percent limit. The default is 50,
+ to match the current implementation of powerclamp driver. Also doesn't
+ allow value more than 75, if the cpumask includes every CPU present in
+ the system.
diff --git a/Documentation/driver-api/thermal/index.rst b/Documentation/driver-api/thermal/index.rst
index 030306ffa408..a886028014ab 100644
--- a/Documentation/driver-api/thermal/index.rst
+++ b/Documentation/driver-api/thermal/index.rst
@@ -14,7 +14,6 @@ Thermal
exynos_thermal
exynos_thermal_emulation
- intel_powerclamp
nouveau_thermal
x86_pkg_temperature_thermal
intel_dptf