/* SPDX-License-Identifier: GPL-2.0-or-later */ #ifndef _ASM_POWERPC_PARAVIRT_H #define _ASM_POWERPC_PARAVIRT_H #include <linux/jump_label.h> #include <asm/smp.h> #ifdef CONFIG_PPC64 #include <asm/paca.h> #include <asm/hvcall.h> #endif #ifdef CONFIG_PPC_SPLPAR DECLARE_STATIC_KEY_FALSE(shared_processor); static inline bool is_shared_processor(void) { return static_branch_unlikely(&shared_processor); } /* If bit 0 is set, the cpu has been preempted */ static inline u32 yield_count_of(int cpu) { __be32 yield_count = READ_ONCE(lppaca_of(cpu).yield_count); return be32_to_cpu(yield_count); } static inline void yield_to_preempted(int cpu, u32 yield_count) { plpar_hcall_norets(H_CONFER, get_hard_smp_processor_id(cpu), yield_count); } static inline void prod_cpu(int cpu) { plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); } static inline void yield_to_any(void) { plpar_hcall_norets(H_CONFER, -1, 0); } #else static inline bool is_shared_processor(void) { return false; } static inline u32 yield_count_of(int cpu) { return 0; } extern void ___bad_yield_to_preempted(void); static inline void yield_to_preempted(int cpu, u32 yield_count) { ___bad_yield_to_preempted(); /* This would be a bug */ } extern void ___bad_yield_to_any(void); static inline void yield_to_any(void) { ___bad_yield_to_any(); /* This would be a bug */ } extern void ___bad_prod_cpu(void); static inline void prod_cpu(int cpu) { ___bad_prod_cpu(); /* This would be a bug */ } #endif #define vcpu_is_preempted vcpu_is_preempted static inline bool vcpu_is_preempted(int cpu) { if (!is_shared_processor()) return false; if (yield_count_of(cpu) & 1) return true; return false; } static inline bool pv_is_native_spin_unlock(void) { return !is_shared_processor(); } #endif /* _ASM_POWERPC_PARAVIRT_H */