[PATCH v2 1/3] perf/amd/ibs: Reset CPU0 IBS state on syscore resume

[Ravi Bangoria]

During a suspend/resume cycle, all CPUs except CPU0 go through hotplug
callbacks, which sets up IBS state. CPU0 bypasses this path, leaving its
IBS state stale after resume. Fix this by explicitly setting CPU0's IBS
state in the syscore ->resume() callback.

Fixes: efa5700ec0da ("perf/amd/ibs: Support IBS_{FETCH|OP}_CTL2[Dis] to eliminate RMW race")
Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxx>
Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>
---
 arch/x86/events/amd/ibs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 3531f9c23b8c..bfb51f8e184f 100644
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -1948,7 +1948,7 @@ static int perf_ibs_suspend(void *data)
 static void perf_ibs_resume(void *data)
 {
 	ibs_eilvt_setup();
-	setup_APIC_ibs();
+	x86_pmu_amd_ibs_starting_cpu(smp_processor_id());
 }
 
 static const struct syscore_ops perf_ibs_syscore_ops = {
-- 
2.55.0