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cpufreq / intel_pstate: Add kernel command line option disable intel_pstate.

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When intel_pstate is configured into the kernel it will become the
preferred scaling driver for processors that it supports.  Allow the
user to override this by adding:
   intel_pstate=disable
on the kernel command line.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dirk Brandewie 2013-02-15 22:55:10 +01:00 • committed by Rafael J. Wysocki
parent da0d9fda37
commit 6be2649861
2 changed files with 21 additions and 0 deletions
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5
Documentation/kernel-parameters.txt
View file

@ -1131,6 +1131,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
0 disables intel_idle and fall back on acpi_idle. 0 disables intel_idle and fall back on acpi_idle.
1 to 6 specify maximum depth of C-state. 1 to 6 specify maximum depth of C-state.
intel_pstate= [X86]
disable
Do not enable intel_pstate as the default
scaling driver for the supported processors
intremap= [X86-64, Intel-IOMMU] intremap= [X86-64, Intel-IOMMU]
on enable Interrupt Remapping (default) on enable Interrupt Remapping (default)
off disable Interrupt Remapping off disable Interrupt Remapping

16
drivers/cpufreq/intel_pstate.c
View file

@ -773,11 +773,16 @@ static void intel_pstate_exit(void)
} }
module_exit(intel_pstate_exit); module_exit(intel_pstate_exit);
static int __initdata no_load;
static int __init intel_pstate_init(void) static int __init intel_pstate_init(void)
{ {
int rc = 0; int rc = 0;
const struct x86_cpu_id *id; const struct x86_cpu_id *id;
if (no_load)
return -ENODEV;
id = x86_match_cpu(intel_pstate_cpu_ids); id = x86_match_cpu(intel_pstate_cpu_ids);
if (!id) if (!id)
return -ENODEV; return -ENODEV;
@ -802,6 +807,17 @@ out:
} }
device_initcall(intel_pstate_init); device_initcall(intel_pstate_init);
static int __init intel_pstate_setup(char *str)
{
if (!str)
return -EINVAL;
if (!strcmp(str, "disable"))
no_load = 1;
return 0;
}
early_param("intel_pstate", intel_pstate_setup);
MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");