[PATCH V13 4/7] cpufreq: Add a notification message that the highest perf has changed

Meng Li
2024-01-12T09:26:14Z

BIOS issues the notify 0x85 to OS that the highest performance
changed. And it will affect the ranking of the preferred core.
AMD-pstate driver will set the priority of cores based on the
preferred core ranking.

Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Perry Yuan <perry.yuan@amd.com>
Signed-off-by: Meng Li <li.meng@amd.com>
Link: https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#processor-device-notification-values
---
drivers/acpi/processor_driver.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 4bd16b3f0781..67db60eda370 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -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;
--
2.34.1