mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
106 lines
2.2 KiB
106 lines
2.2 KiB
/* 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 |
|
#include <linux/smp.h> |
|
#include <asm/kvm_guest.h> |
|
#include <asm/cputhreads.h> |
|
|
|
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; |
|
|
|
#ifdef CONFIG_PPC_SPLPAR |
|
if (!is_kvm_guest()) { |
|
int first_cpu = cpu_first_thread_sibling(smp_processor_id()); |
|
|
|
/* |
|
* Preemption can only happen at core granularity. This CPU |
|
* is not preempted if one of the CPU of this core is not |
|
* preempted. |
|
*/ |
|
if (cpu_first_thread_sibling(cpu) == first_cpu) |
|
return false; |
|
} |
|
#endif |
|
|
|
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 */
|
|
|