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intel_idle: Add module parameter to prevent ACPI _CST from being used 

Add a new module parameter called "no_acpi" to the intel_idle driver
to allow the driver to be prevented from using ACPI _CST via kernel
command line.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2019-12-13 09:56:29 +01:00
parent bff8e60a86
commit 4ec32d9e8e
1 changed files with 9 additions and 0 deletions
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9
drivers/idle/intel_idle.c
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@ -1138,6 +1138,10 @@ static bool intel_idle_max_cstate_reached(int cstate)
#ifdef CONFIG_ACPI_PROCESSOR_CSTATE
#include <acpi/processor.h>
static bool no_acpi __read_mostly;
module_param(no_acpi, bool, 0444);
MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list");
static struct acpi_processor_power acpi_state_table;
/**
@ -1167,6 +1171,11 @@ static bool intel_idle_acpi_cst_extract(void)
{
unsigned int cpu;
if (no_acpi) {
pr_debug("Not allowed to use ACPI _CST\n");
return false;
}
for_each_possible_cpu(cpu) {
struct acpi_processor *pr = per_cpu(processors, cpu);