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Diffstat (limited to '')
-rw-r--r-- | arch/powerpc/include/asm/idle.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/idle.h b/arch/powerpc/include/asm/idle.h new file mode 100644 index 000000000..accd1f500 --- /dev/null +++ b/arch/powerpc/include/asm/idle.h @@ -0,0 +1,93 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _ASM_POWERPC_IDLE_H +#define _ASM_POWERPC_IDLE_H +#include <asm/runlatch.h> +#include <asm/paca.h> + +#ifdef CONFIG_PPC_PSERIES +DECLARE_PER_CPU(u64, idle_spurr_cycles); +DECLARE_PER_CPU(u64, idle_entry_purr_snap); +DECLARE_PER_CPU(u64, idle_entry_spurr_snap); + +static inline void snapshot_purr_idle_entry(void) +{ + *this_cpu_ptr(&idle_entry_purr_snap) = mfspr(SPRN_PURR); +} + +static inline void snapshot_spurr_idle_entry(void) +{ + *this_cpu_ptr(&idle_entry_spurr_snap) = mfspr(SPRN_SPURR); +} + +static inline void update_idle_purr_accounting(void) +{ + u64 wait_cycles; + u64 in_purr = *this_cpu_ptr(&idle_entry_purr_snap); + + wait_cycles = be64_to_cpu(get_lppaca()->wait_state_cycles); + wait_cycles += mfspr(SPRN_PURR) - in_purr; + get_lppaca()->wait_state_cycles = cpu_to_be64(wait_cycles); +} + +static inline void update_idle_spurr_accounting(void) +{ + u64 *idle_spurr_cycles_ptr = this_cpu_ptr(&idle_spurr_cycles); + u64 in_spurr = *this_cpu_ptr(&idle_entry_spurr_snap); + + *idle_spurr_cycles_ptr += mfspr(SPRN_SPURR) - in_spurr; +} + +static inline void pseries_idle_prolog(void) +{ + ppc64_runlatch_off(); + snapshot_purr_idle_entry(); + snapshot_spurr_idle_entry(); + /* + * Indicate to the HV that we are idle. Now would be + * a good time to find other work to dispatch. + */ + get_lppaca()->idle = 1; +} + +static inline void pseries_idle_epilog(void) +{ + update_idle_purr_accounting(); + update_idle_spurr_accounting(); + get_lppaca()->idle = 0; + ppc64_runlatch_on(); +} + +static inline u64 read_this_idle_purr(void) +{ + /* + * If we are reading from an idle context, update the + * idle-purr cycles corresponding to the last idle period. + * Since the idle context is not yet over, take a fresh + * snapshot of the idle-purr. + */ + if (unlikely(get_lppaca()->idle == 1)) { + update_idle_purr_accounting(); + snapshot_purr_idle_entry(); + } + + return be64_to_cpu(get_lppaca()->wait_state_cycles); +} + +static inline u64 read_this_idle_spurr(void) +{ + /* + * If we are reading from an idle context, update the + * idle-spurr cycles corresponding to the last idle period. + * Since the idle context is not yet over, take a fresh + * snapshot of the idle-spurr. + */ + if (get_lppaca()->idle == 1) { + update_idle_spurr_accounting(); + snapshot_spurr_idle_entry(); + } + + return *this_cpu_ptr(&idle_spurr_cycles); +} + +#endif /* CONFIG_PPC_PSERIES */ +#endif |