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| author |   Viresh Kumar <viresh.kumar@linaro.org> | 2021-03-10 08:21:04 +0530 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2021-03-10 10:55:37 +0530 |
| commit | 01e055c120a46e78650b5f903088badbbdaae9ad (patch) | |
| tree | 41d5fd7f32cffa82be61e3bd749bfa8f52af1464 /arch/arm64/include/asm/topology.h | |
| parent | arch_topology: Rename freq_scale as arch_freq_scale (diff) | |
| download | linux-dev-01e055c120a46e78650b5f903088badbbdaae9ad.tar.xz linux-dev-01e055c120a46e78650b5f903088badbbdaae9ad.zip | |
arch_topology: Allow multiple entities to provide sched_freq_tick() callback
This patch attempts to make it generic enough so other parts of the
kernel can also provide their own implementation of scale_freq_tick()
callback, which is called by the scheduler periodically to update the
per-cpu arch_freq_scale variable.
The implementations now need to provide 'struct scale_freq_data' for the
CPUs for which they have hardware counters available, and a callback
gets registered for each possible CPU in a per-cpu variable.
The arch specific (or ARM AMU) counters are updated to adapt to this and
they take the highest priority if they are available, i.e. they will be
used instead of CPPC based counters for example.
The special code to rebuild the sched domains, in case invariance status
change for the system, is moved out of arm64 specific code and is added
to arch_topology.c.
Note that this also defines SCALE_FREQ_SOURCE_CPUFREQ but doesn't use it
and it is added to show that cpufreq is also acts as source of
information for FIE and will be used by default if no other counters are
supported for a platform.
Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Ionela Voinescu <ionela.voinescu@arm.com>
Acked-by: Will Deacon <will@kernel.org> # for arm64
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'arch/arm64/include/asm/topology.h')
| -rw-r--r-- | arch/arm64/include/asm/topology.h | 10 |
1 files changed, 1 insertions, 9 deletions
diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h index 3b8dca4eb08d..ec2db3419c41 100644 --- a/arch/arm64/include/asm/topology.h +++ b/arch/arm64/include/asm/topology.h @@ -17,17 +17,9 @@ int pcibus_to_node(struct pci_bus *bus); #include <linux/arch_topology.h> void update_freq_counters_refs(void); -void topology_scale_freq_tick(void); - -#ifdef CONFIG_ARM64_AMU_EXTN -/* - * Replace task scheduler's default counter-based - * frequency-invariance scale factor setting. - */ -#define arch_scale_freq_tick topology_scale_freq_tick -#endif /* CONFIG_ARM64_AMU_EXTN */ /* Replace task scheduler's default frequency-invariant accounting */ +#define arch_scale_freq_tick topology_scale_freq_tick #define arch_set_freq_scale topology_set_freq_scale #define arch_scale_freq_capacity topology_get_freq_scale #define arch_scale_freq_invariant topology_scale_freq_invariant |