diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2020-07-24 23:14:21 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-07-27 00:01:29 +1000 |
| commit | 20c0e8269e9d515e677670902c7e1cc0209d6ad9 (patch) | |
| tree | 1de7272a98830301f6d21a1b8cdab7d28d0e83c1 /arch/powerpc/include/asm/paravirt.h | |
| parent | aa65ff6b18e0366db1790609956a4ac7308c5668 (diff) | |
powerpc/pseries: Implement paravirt qspinlocks for SPLPAR
This implements the generic paravirt qspinlocks using H_PROD and
H_CONFER to kick and wait.
This uses an un-directed yield to any CPU rather than the directed
yield to a pre-empted lock holder that paravirtualised simple
spinlocks use, that requires no kick hcall. This is something that
could be investigated and improved in future.
Performance results can be found in the commit which added queued
spinlocks.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200724131423.1362108-5-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/paravirt.h')
| -rw-r--r-- | arch/powerpc/include/asm/paravirt.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/paravirt.h b/arch/powerpc/include/asm/paravirt.h index 339e8533464b..9362c94fe3aa 100644 --- a/arch/powerpc/include/asm/paravirt.h +++ b/arch/powerpc/include/asm/paravirt.h @@ -28,6 +28,16 @@ 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) { @@ -44,6 +54,19 @@ 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 @@ -56,4 +79,9 @@ static inline bool vcpu_is_preempted(int cpu) return false; } +static inline bool pv_is_native_spin_unlock(void) +{ + return !is_shared_processor(); +} + #endif /* _ASM_POWERPC_PARAVIRT_H */ |