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107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _ASM_POWERPC_PARAVIRT_H
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#define _ASM_POWERPC_PARAVIRT_H
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#include <linux/jump_label.h>
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#include <asm/smp.h>
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#ifdef CONFIG_PPC64
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#include <asm/paca.h>
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#include <asm/hvcall.h>
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#endif
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#ifdef CONFIG_PPC_SPLPAR
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#include <linux/smp.h>
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#include <asm/kvm_guest.h>
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#include <asm/cputhreads.h>
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DECLARE_STATIC_KEY_FALSE(shared_processor);
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static inline bool is_shared_processor(void)
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{
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return static_branch_unlikely(&shared_processor);
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}
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/* If bit 0 is set, the cpu has been preempted */
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static inline u32 yield_count_of(int cpu)
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{
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__be32 yield_count = READ_ONCE(lppaca_of(cpu).yield_count);
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return be32_to_cpu(yield_count);
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}
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static inline void yield_to_preempted(int cpu, u32 yield_count)
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{
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plpar_hcall_norets(H_CONFER, get_hard_smp_processor_id(cpu), yield_count);
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}
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static inline void prod_cpu(int cpu)
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{
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plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
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}
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static inline void yield_to_any(void)
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{
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plpar_hcall_norets(H_CONFER, -1, 0);
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}
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#else
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static inline bool is_shared_processor(void)
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{
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return false;
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}
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static inline u32 yield_count_of(int cpu)
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{
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return 0;
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}
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extern void ___bad_yield_to_preempted(void);
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static inline void yield_to_preempted(int cpu, u32 yield_count)
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{
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___bad_yield_to_preempted(); /* This would be a bug */
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}
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extern void ___bad_yield_to_any(void);
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static inline void yield_to_any(void)
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{
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___bad_yield_to_any(); /* This would be a bug */
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}
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extern void ___bad_prod_cpu(void);
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static inline void prod_cpu(int cpu)
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{
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___bad_prod_cpu(); /* This would be a bug */
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}
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#endif
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#define vcpu_is_preempted vcpu_is_preempted
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static inline bool vcpu_is_preempted(int cpu)
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{
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if (!is_shared_processor())
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return false;
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#ifdef CONFIG_PPC_SPLPAR
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if (!is_kvm_guest()) {
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int first_cpu = cpu_first_thread_sibling(smp_processor_id());
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/*
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* Preemption can only happen at core granularity. This CPU
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* is not preempted if one of the CPU of this core is not
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* preempted.
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*/
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if (cpu_first_thread_sibling(cpu) == first_cpu)
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return false;
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}
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#endif
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if (yield_count_of(cpu) & 1)
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return true;
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return false;
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}
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static inline bool pv_is_native_spin_unlock(void)
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{
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return !is_shared_processor();
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}
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#endif /* _ASM_POWERPC_PARAVIRT_H */
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