forked from mirrors/linux
18b5e7170a
Code in the idle path is not allowed to be instrumented because RCU is
disabled, see commit 0e985e9d22 ("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
93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _ASM_POWERPC_IDLE_H
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#define _ASM_POWERPC_IDLE_H
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#include <asm/runlatch.h>
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#include <asm/paca.h>
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#ifdef CONFIG_PPC_PSERIES
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DECLARE_PER_CPU(u64, idle_spurr_cycles);
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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 __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 __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 __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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wait_cycles = be64_to_cpu(get_lppaca()->wait_state_cycles);
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wait_cycles += mfspr(SPRN_PURR) - in_purr;
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get_lppaca()->wait_state_cycles = cpu_to_be64(wait_cycles);
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}
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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 __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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snapshot_spurr_idle_entry();
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/*
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* Indicate to the HV that we are idle. Now would be
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* a good time to find other work to dispatch.
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*/
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get_lppaca()->idle = 1;
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}
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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();
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get_lppaca()->idle = 0;
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ppc64_runlatch_on();
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}
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static inline u64 read_this_idle_purr(void)
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{
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/*
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* If we are reading from an idle context, update the
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* idle-purr cycles corresponding to the last idle period.
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* Since the idle context is not yet over, take a fresh
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* snapshot of the idle-purr.
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*/
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if (unlikely(get_lppaca()->idle == 1)) {
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update_idle_purr_accounting();
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snapshot_purr_idle_entry();
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}
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return be64_to_cpu(get_lppaca()->wait_state_cycles);
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}
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static inline u64 read_this_idle_spurr(void)
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{
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/*
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* If we are reading from an idle context, update the
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* idle-spurr cycles corresponding to the last idle period.
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* Since the idle context is not yet over, take a fresh
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* snapshot of the idle-spurr.
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*/
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if (get_lppaca()->idle == 1) {
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update_idle_spurr_accounting();
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snapshot_spurr_idle_entry();
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}
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return *this_cpu_ptr(&idle_spurr_cycles);
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}
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#endif /* CONFIG_PPC_PSERIES */
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#endif
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