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ACPI: cpufreq: Add highest perf change notification

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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>
This commit is contained in:
Meng Li
2024-01-19 17:04:59 +08:00
committed by Rafael J. Wysocki
parent f3a0523918
commit 9c4a13a08a
2 changed files with 7 additions and 0 deletions
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include/linux/cpufreq.h
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@@ -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