diff options
| author | David Arcari <darcari@redhat.com> | 2025-02-20 10:11:20 -0500 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2025-02-25 12:13:40 +0100 |
| commit | 5e7e39ae15b0ea370e783a9326fdd1d91357fc3e (patch) | |
| tree | d8ab3e32ac11d8e5791d34b5985be6082ca44076 /Documentation/admin-guide/pm | |
| parent | c93d13b661a6ce34b9cd8241f5e410658078d7b1 (diff) | |
intel_idle: introduce 'no_native' module parameter
Since commit 18734958e9bf ("intel_idle: Use ACPI _CST for processor models
without C-state tables") the intel_idle driver has had the ability to use
the ACPI _CST to populate C-states when the processor model is not
recognized.
However, even when the processor model is recognized (native mode) there
are cases where it is useful to make the driver ignore the per-CPU idle
states in lieu of ACPI C-states (such as specific application performance).
Add a new 'no_native' module parameter to provide this functionality.
Signed-off-by: David Arcari <darcari@redhat.com>
Link: https://patch.msgid.link/20250220151120.1131122-1-darcari@redhat.com
Reviewed-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
[ rjw: Spell CPU in capitals ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/admin-guide/pm')
| -rw-r--r-- | Documentation/admin-guide/pm/intel_idle.rst | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/Documentation/admin-guide/pm/intel_idle.rst b/Documentation/admin-guide/pm/intel_idle.rst index 39bd6ecce7de..5940528146eb 100644 --- a/Documentation/admin-guide/pm/intel_idle.rst +++ b/Documentation/admin-guide/pm/intel_idle.rst @@ -192,11 +192,19 @@ even if they have been enumerated (see :ref:`cpu-pm-qos` in Documentation/admin-guide/pm/cpuidle.rst). Setting ``max_cstate`` to 0 causes the ``intel_idle`` initialization to fail. -The ``no_acpi`` and ``use_acpi`` module parameters (recognized by ``intel_idle`` -if the kernel has been configured with ACPI support) can be set to make the -driver ignore the system's ACPI tables entirely or use them for all of the -recognized processor models, respectively (they both are unset by default and -``use_acpi`` has no effect if ``no_acpi`` is set). +The ``no_acpi``, ``use_acpi`` and ``no_native`` module parameters are +recognized by ``intel_idle`` if the kernel has been configured with ACPI +support. In the case that ACPI is not configured these flags have no impact +on functionality. + +``no_acpi`` - Do not use ACPI at all. Only native mode is available, no +ACPI mode. + +``use_acpi`` - No-op in ACPI mode, the driver will consult ACPI tables for +C-states on/off status in native mode. + +``no_native`` - Work only in ACPI mode, no native mode available (ignore +all custom tables). The value of the ``states_off`` module parameter (0 by default) represents a list of idle states to be disabled by default in the form of a bitmask. |