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powerpc/pseries: Move some PAPR paravirt functions to their own file

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These functions will be used by the queued spinlock implementation,
and may be useful elsewhere too, so move them out of spinlock.h.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200724131423.1362108-2-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
2020-07-24 23:14:18 +10:00
committed by Michael Ellerman
parent dbce456280
commit 20d444d06f
3 changed files with 66 additions and 29 deletions
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12
arch/powerpc/lib/locks.c
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@@ -27,14 +27,14 @@ void splpar_spin_yield(arch_spinlock_t *lock)
return;
holder_cpu = lock_value & 0xffff;
BUG_ON(holder_cpu >= NR_CPUS);
yield_count = be32_to_cpu(lppaca_of(holder_cpu).yield_count);
yield_count = yield_count_of(holder_cpu);
if ((yield_count & 1) == 0)
return; /* virtual cpu is currently running */
rmb();
if (lock->slock != lock_value)
return; /* something has changed */
plpar_hcall_norets(H_CONFER,
get_hard_smp_processor_id(holder_cpu), yield_count);
yield_to_preempted(holder_cpu, yield_count);
}
EXPORT_SYMBOL_GPL(splpar_spin_yield);
@@ -53,13 +53,13 @@ void splpar_rw_yield(arch_rwlock_t *rw)
return; /* no write lock at present */
holder_cpu = lock_value & 0xffff;
BUG_ON(holder_cpu >= NR_CPUS);
yield_count = be32_to_cpu(lppaca_of(holder_cpu).yield_count);
yield_count = yield_count_of(holder_cpu);
if ((yield_count & 1) == 0)
return; /* virtual cpu is currently running */
rmb();
if (rw->lock != lock_value)
return; /* something has changed */
plpar_hcall_norets(H_CONFER,
get_hard_smp_processor_id(holder_cpu), yield_count);
yield_to_preempted(holder_cpu, yield_count);
}
#endif