[PATCH 2/2] powerpc/powernv/idle: Restore CIABR after idle for Power9

[Jordan Niethe]

On Power9, CIABR is lost after idle. This means that instruction
breakpoints set by xmon which use CIABR do not work. Fix this by
restoring CIABR after idle.

Signed-off-by: Jordan Niethe <jniethe5 at gmail.com>
---
 arch/powerpc/platforms/powernv/idle.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c
index 1ed7c5286487..e6f461812856 100644
--- a/arch/powerpc/platforms/powernv/idle.c
+++ b/arch/powerpc/platforms/powernv/idle.c
@@ -589,6 +589,7 @@ struct p9_sprs {
 	u64 spurr;
 	u64 dscr;
 	u64 wort;
+	u64 ciabr;
 
 	u64 mmcra;
 	u32 mmcr0;
@@ -668,6 +669,7 @@ static unsigned long power9_idle_stop(unsigned long psscr, bool mmu_on)
 		sprs.spurr	= mfspr(SPRN_SPURR);
 		sprs.dscr	= mfspr(SPRN_DSCR);
 		sprs.wort	= mfspr(SPRN_WORT);
+		sprs.ciabr	= mfspr(SPRN_CIABR);
 
 		sprs.mmcra	= mfspr(SPRN_MMCRA);
 		sprs.mmcr0	= mfspr(SPRN_MMCR0);
@@ -785,6 +787,7 @@ static unsigned long power9_idle_stop(unsigned long psscr, bool mmu_on)
 	mtspr(SPRN_SPURR,	sprs.spurr);
 	mtspr(SPRN_DSCR,	sprs.dscr);
 	mtspr(SPRN_WORT,	sprs.wort);
+	mtspr(SPRN_CIABR,	sprs.ciabr);
 
 	mtspr(SPRN_MMCRA,	sprs.mmcra);
 	mtspr(SPRN_MMCR0,	sprs.mmcr0);
-- 
2.17.1