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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 <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201207010519.15597-2-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe 2020-12-07 12:05:19 +11:00 committed by Michael Ellerman
parent 4bb3219837
commit 250ad7a45b
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/platforms/powernv/idle.c
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@ -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);