This is a debug patch that helps trace various STOP
state transitions and look at srr1 and psscr at wakeup.
Signed-off-by: Vaidyanathan Srinivasan <sva...@linux.vnet.ibm.com>
---
arch/powerpc/platforms/powernv/smp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/smp.c
b/arch/powerpc/platforms/powernv/smp.c
index e39e6c4..5b3f002 100644
--- a/arch/powerpc/platforms/powernv/smp.c
+++ b/arch/powerpc/platforms/powernv/smp.c
@@ -185,8 +185,12 @@ static void pnv_smp_cpu_kill_self(void)
ppc64_runlatch_off();
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
+ pr_info("CPU%d going offline with request psscr
%016llx\n",
+ cpu, pnv_deepest_stop_psscr_val);
srr1 = power9_idle_stop(pnv_deepest_stop_psscr_val,
pnv_deepest_stop_psscr_mask);
+ pr_info("CPU%d coming online with psscr %016lx, srr1
%016lx\n",
+ cpu, mfspr(SPRN_PSSCR), srr1);
} else if (idle_states & OPAL_PM_WINKLE_ENABLED) {
srr1 = power7_winkle();
} else if ((idle_states & OPAL_PM_SLEEP_ENABLED) ||
--
2.9.3
