Commit 250ad7a4 authored by Jordan Niethe's avatar Jordan Niethe Committed by Michael Ellerman
Browse files

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: default avatarJordan Niethe <jniethe5@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201207010519.15597-2-jniethe5@gmail.com
parent 4bb32198

arch/powerpc/platforms/powernv/idle.c

+3 −0
Original line number Diff line number Diff line
@@ -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);