Commit 9c4a13a0 authored by Meng Li's avatar Meng Li Committed by Rafael J. Wysocki
Browse files

ACPI: cpufreq: Add highest perf change notification 



Platform firmware sends notify 0x85 to inform the OS that the highest
performance of a CPU has changed.

This will be used by the AMD P-state driver to update the ranking of
preferred cores and set the priority of cores accordingly.

Tested-by: default avatarOleksandr Natalenko <oleksandr@natalenko.name>
Reviewed-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Reviewed-by: default avatarHuang Rui <ray.huang@amd.com>
Reviewed-by: default avatarPerry Yuan <perry.yuan@amd.com>
Signed-off-by: default avatarMeng Li <li.meng@amd.com>
Link: https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#processor-device-notification-values


[ rjw: New subject, changelog edits ]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent f3a05239

drivers/acpi/processor_driver.c

+6 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80

#define ACPI_PROCESSOR_NOTIFY_POWER	0x81

#define ACPI_PROCESSOR_NOTIFY_THROTTLING	0x82

#define ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED	0x85



MODULE_AUTHOR("Paul Diefenbaugh");

MODULE_DESCRIPTION("ACPI Processor Driver");
@@ -83,6 +84,11 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 
		acpi_bus_generate_netlink_event(device->pnp.device_class,

						  dev_name(&device->dev), event, 0);

		break;

	case ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED:

		cpufreq_update_limits(pr->id);

		acpi_bus_generate_netlink_event(device->pnp.device_class,

						  dev_name(&device->dev), event, 0);

		break;

	default:

		acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);

		break;

include/linux/cpufreq.h

+1 −0
Original line number Diff line number Diff line
@@ -263,6 +263,7 @@ static inline bool cpufreq_supports_freq_invariance(void) 
	return false;

}

static inline void disable_cpufreq(void) { }

static inline void cpufreq_update_limits(unsigned int cpu) { }

#endif



#ifdef CONFIG_CPU_FREQ_STAT