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#proc... --- drivers/acpi/processor_driver.c | 6 ++++++ include/linux/cpufreq.h | 1 + 2 files changed, 7 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; diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index afda5f24d3dd..9bebeec24abb 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -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