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| author |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-12-13 09:56:29 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-12-27 11:02:09 +0100 |
| commit | 4ec32d9e8e5b6d6eb491eeee3938665d8a2388fa (patch) | |
| tree | 3e427f5bc7ad8a0e6038189ececf71c0fde1a623 /drivers/idle/intel_idle.c | |
| parent | intel_idle: Allow ACPI _CST to be used for selected known processors (diff) | |
| download | linux-dev-4ec32d9e8e5b6d6eb491eeee3938665d8a2388fa.tar.xz linux-dev-4ec32d9e8e5b6d6eb491eeee3938665d8a2388fa.zip | |
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>
Diffstat (limited to 'drivers/idle/intel_idle.c')
| -rw-r--r-- | drivers/idle/intel_idle.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index a072b84d9595..26fe383bb921 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -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); |