ACPI: Load acpi-cpufreq from processor driver automatically
The only left over hole in automatic cpufreq driver loading was the loading of ACPI cpufreq. This driver should be loaded when ACPI supports a _PDC method and the CPU vendor wants to use acpi cpufreq. Simply add a request module call to the acpi processor core driver when this is true. This seems like the simplest solution for this. Cc: Len Brown <lenb@kernel.org> Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Thomas Renninger <trenn@suse.de> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -497,6 +497,7 @@ static int __cpuinit acpi_processor_add(struct acpi_device *device)
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#ifdef CONFIG_CPU_FREQ
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#ifdef CONFIG_CPU_FREQ
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acpi_processor_ppc_has_changed(pr, 0);
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acpi_processor_ppc_has_changed(pr, 0);
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acpi_processor_load_module(pr);
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#endif
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#endif
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acpi_processor_get_throttling_info(pr);
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acpi_processor_get_throttling_info(pr);
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acpi_processor_get_limit_info(pr);
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acpi_processor_get_limit_info(pr);
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@ -240,6 +240,28 @@ void acpi_processor_ppc_exit(void)
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acpi_processor_ppc_status &= ~PPC_REGISTERED;
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acpi_processor_ppc_status &= ~PPC_REGISTERED;
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}
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}
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/*
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* Do a quick check if the systems looks like it should use ACPI
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* cpufreq. We look at a _PCT method being available, but don't
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* do a whole lot of sanity checks.
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*/
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void acpi_processor_load_module(struct acpi_processor *pr)
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{
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static int requested;
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acpi_status status = 0;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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if (!arch_has_acpi_pdc() || requested)
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return;
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status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
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if (!ACPI_FAILURE(status)) {
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printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");
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request_module_nowait("acpi_cpufreq");
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requested = 1;
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}
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kfree(buffer.pointer);
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}
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static int acpi_processor_get_performance_control(struct acpi_processor *pr)
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static int acpi_processor_get_performance_control(struct acpi_processor *pr)
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{
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{
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int result = 0;
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int result = 0;
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@ -224,6 +224,7 @@ struct acpi_processor_errata {
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} piix4;
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} piix4;
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};
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};
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extern void acpi_processor_load_module(struct acpi_processor *pr);
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extern int acpi_processor_preregister_performance(struct
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extern int acpi_processor_preregister_performance(struct
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acpi_processor_performance
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acpi_processor_performance
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__percpu *performance);
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__percpu *performance);
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