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| author | Giovanni Gherdovich <ggherdovich@suse.cz> | 2020-01-22 16:16:17 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-01-28 21:37:06 +0100 |
| commit | 918229cdd5abb50d8a2edfcd8dc6b6bc53afd765 (patch) | |
| tree | 12730094c862018d0a80f261b3abe54d7e7f4186 /arch/x86/include/asm/topology.h | |
| parent | 298c6f99bf30ef735e79f7f6d086bdfae505d380 (diff) | |
| download | linux-918229cdd5abb50d8a2edfcd8dc6b6bc53afd765.tar.bz2 | |
x86/intel_pstate: Handle runtime turbo disablement/enablement in frequency invariance
On some platforms such as the Dell XPS 13 laptop the firmware disables turbo
when the machine is disconnected from AC, and viceversa it enables it again
when it's reconnected. In these cases a _PPC ACPI notification is issued.
The scheduler needs to know freq_max for frequency-invariant calculations.
To account for turbo availability to come and go, record freq_max at boot as
if turbo was available and store it in a helper variable. Use a setter
function to swap between freq_base and freq_max every time turbo goes off or on.
Signed-off-by: Giovanni Gherdovich <ggherdovich@suse.cz>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lkml.kernel.org/r/20200122151617.531-7-ggherdovich@suse.cz
Diffstat (limited to 'arch/x86/include/asm/topology.h')
| -rw-r--r-- | arch/x86/include/asm/topology.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h index 2ebf7b7b2126..79d8d5496330 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -211,6 +211,11 @@ static inline long arch_scale_freq_capacity(int cpu) extern void arch_scale_freq_tick(void); #define arch_scale_freq_tick arch_scale_freq_tick +extern void arch_set_max_freq_ratio(bool turbo_disabled); +#else +static inline void arch_set_max_freq_ratio(bool turbo_disabled) +{ +} #endif #endif /* _ASM_X86_TOPOLOGY_H */ |