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cpufreq: intel_pstate: hybrid: Avoid exposing two global attributes

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The turbo_pct and num_pstates sysfs attributes represent CPU
properties that may be different for differenty types of CPUs in
a hybrid processor, so avoid exposing them in that case.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2021-05-12 16:15:48 +02:00
parent d07f6ca923
commit c3d175e485
2 changed files with 19 additions and 2 deletions
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6
Documentation/admin-guide/pm/intel_pstate.rst
View file

@ -365,6 +365,9 @@ argument is passed to the kernel in the command line.
inclusive) including both turbo and non-turbo P-states (see
`Turbo P-states Support`_).
This attribute is present only if the value exposed by it is the same
for all of the CPUs in the system.
The value of this attribute is not affected by the ``no_turbo``
setting described `below <no_turbo_attr_>`_.
@ -374,6 +377,9 @@ argument is passed to the kernel in the command line.
Ratio of the `turbo range <turbo_>`_ size to the size of the entire
range of supported P-states, in percent.
This attribute is present only if the value exposed by it is the same
for all of the CPUs in the system.
This attribute is read-only.
.. _no_turbo_attr:

15
drivers/cpufreq/intel_pstate.c
View file

@ -1365,8 +1365,6 @@ define_one_global_rw(energy_efficiency);
static struct attribute *intel_pstate_attributes[] = {
&status.attr,
&no_turbo.attr,
&turbo_pct.attr,
&num_pstates.attr,
NULL
};
@ -1391,6 +1389,14 @@ static void __init intel_pstate_sysfs_expose_params(void)
if (WARN_ON(rc))
return;
if (!boot_cpu_has(X86_FEATURE_HYBRID_CPU)) {
rc = sysfs_create_file(intel_pstate_kobject, &turbo_pct.attr);
WARN_ON(rc);
rc = sysfs_create_file(intel_pstate_kobject, &num_pstates.attr);
WARN_ON(rc);
}
/*
* If per cpu limits are enforced there are no global limits, so
* return without creating max/min_perf_pct attributes
@ -1417,6 +1423,11 @@ static void __init intel_pstate_sysfs_remove(void)
sysfs_remove_group(intel_pstate_kobject, &intel_pstate_attr_group);
if (!boot_cpu_has(X86_FEATURE_HYBRID_CPU)) {
sysfs_remove_file(intel_pstate_kobject, &num_pstates.attr);
sysfs_remove_file(intel_pstate_kobject, &turbo_pct.attr);
}
if (!per_cpu_limits) {
sysfs_remove_file(intel_pstate_kobject, &max_perf_pct.attr);
sysfs_remove_file(intel_pstate_kobject, &min_perf_pct.attr);