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powerpc/64s/idle: Process interrupts from system reset wakeup

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When the CPU wakes from low power state, it begins at the system reset
interrupt with the exception that caused the wakeup encoded in SRR1.

Today, powernv idle wakeup ignores the wakeup reason (except a special
case for HMI), and the regular interrupt corresponding to the
exception will fire after the idle wakeup exits.

Change this to replay the interrupt from the idle wakeup before
interrupts are hard-enabled.

Test on POWER8 of context_switch selftests benchmark with polling idle
disabled (e.g., always nap, giving cross-CPU IPIs) gives the following
results:

                                original         wakeup direct
Different threads, same core:   315k/s           264k/s
Different cores:                235k/s           242k/s

There is a slowdown for doorbell IPI (same core) case because system
reset wakeup does not clear the message and the doorbell interrupt
fires again needlessly.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2017-06-13 23:05:47 +10:00
committed by Michael Ellerman
parent 2525db04d1
commit 771d4304d0
3 changed files with 38 additions and 2 deletions
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10
arch/powerpc/platforms/powernv/idle.c
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@@ -302,7 +302,10 @@ static unsigned long __power7_idle_type(unsigned long type)
void power7_idle_type(unsigned long type)
{
__power7_idle_type(type);
unsigned long srr1;
srr1 = __power7_idle_type(type);
irq_set_pending_from_srr1(srr1);
}
void power7_idle(void)
@@ -337,7 +340,10 @@ static unsigned long __power9_idle_type(unsigned long stop_psscr_val,
void power9_idle_type(unsigned long stop_psscr_val,
unsigned long stop_psscr_mask)
{
__power9_idle_type(stop_psscr_val, stop_psscr_mask);
unsigned long srr1;
srr1 = __power9_idle_type(stop_psscr_val, stop_psscr_mask);
irq_set_pending_from_srr1(srr1);
}
/*