From 01e055c120a46e78650b5f903088badbbdaae9ad Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Wed, 10 Mar 2021 08:21:04 +0530 Subject: 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 Tested-by: Ionela Voinescu Acked-by: Will Deacon # for arm64 Tested-by: Vincent Guittot Signed-off-by: Viresh Kumar --- arch/arm64/include/asm/topology.h | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) (limited to 'arch/arm64/include') 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 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 -- cgit