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kernel
os
linux
powerpc/pseries: Always inline functions called from cpuidle
Code in the idle path is not allowed to be instrumented because RCU is
disabled, see commit 0e985e9d2286 ("cpuidle: Add comments about
noinstr/__cpuidle usage").
Force inlining of the inline functions called from cpuidle, to ensure
they are not emitted out-of-line and then available for tracing.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230406144535.3786008-4-mpe@ellerman.id.au
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arch/powerpc/include/asm/idle.h
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arch/powerpc/include/asm/idle.h
···
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DECLARE_PER_CPU(u64, idle_entry_purr_snap);
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DECLARE_PER_CPU(u64, idle_entry_spurr_snap);
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static inline void snapshot_purr_idle_entry(void)
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static __always_inline void snapshot_purr_idle_entry(void)
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{
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*this_cpu_ptr(&idle_entry_purr_snap) = mfspr(SPRN_PURR);
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}
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static inline void snapshot_spurr_idle_entry(void)
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static __always_inline void snapshot_spurr_idle_entry(void)
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{
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*this_cpu_ptr(&idle_entry_spurr_snap) = mfspr(SPRN_SPURR);
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}
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static inline void update_idle_purr_accounting(void)
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static __always_inline void update_idle_purr_accounting(void)
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{
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u64 wait_cycles;
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u64 in_purr = *this_cpu_ptr(&idle_entry_purr_snap);
···
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get_lppaca()->wait_state_cycles = cpu_to_be64(wait_cycles);
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}
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static inline void update_idle_spurr_accounting(void)
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static __always_inline void update_idle_spurr_accounting(void)
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{
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u64 *idle_spurr_cycles_ptr = this_cpu_ptr(&idle_spurr_cycles);
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u64 in_spurr = *this_cpu_ptr(&idle_entry_spurr_snap);
···
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*idle_spurr_cycles_ptr += mfspr(SPRN_SPURR) - in_spurr;
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}
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static inline void pseries_idle_prolog(void)
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static __always_inline void pseries_idle_prolog(void)
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{
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ppc64_runlatch_off();
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snapshot_purr_idle_entry();
···
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get_lppaca()->idle = 1;
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}
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static inline void pseries_idle_epilog(void)
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static __always_inline void pseries_idle_epilog(void)
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{
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update_idle_purr_accounting();
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update_idle_spurr_accounting();