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| author | Meng Li <li.meng@amd.com> | 2024-01-19 17:04:59 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-01-31 14:54:50 +0100 |
| commit | 9c4a13a08a9b7afa4bc33f57675358f0195e302c (patch) | |
| tree | 881d7bcb597fa83f92d793d84a9c07b0434dbab0 | |
| parent | f3a052391822b772b4e27f2594526cf1eb103cab (diff) | |
| download | lwn-9c4a13a08a9b7afa4bc33f57675358f0195e302c.tar.gz lwn-9c4a13a08a9b7afa4bc33f57675358f0195e302c.zip | |
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: 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
[ rjw: New subject, changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/processor_driver.c | 6 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 1 |
2 files changed, 7 insertions, 0 deletions
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 |