From 250ad7a45b1e58d580decfb935fc063c4cf56f91 Mon Sep 17 00:00:00 2001 From: Jordan Niethe Date: Mon, 7 Dec 2020 12:05:19 +1100 Subject: [PATCH] powerpc/powernv/idle: Restore CIABR after idle for Power9 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 Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201207010519.15597-2-jniethe5@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 1ed7c52..e6f4618 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 @@ core_woken: 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); -- 2.7.4