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(parent: 6b74d60) | patch
powerpc/perf: Avoid spurious PMU interrupts after idle
authorNicholas Piggin <npiggin@gmail.com>
Mon, 10 Jul 2017 06:19:38 +0000 (16:19 +1000)
committerMichael Ellerman <mpe@ellerman.id.au>
Tue, 18 Jul 2017 01:45:47 +0000 (11:45 +1000)
commitcb7c259320d59edd08f4e3b6ea2dc08cc04f2030
tree0d25f21a5c4d5f3a3592de7e82249422065fed92tree | snapshot
parent6b74d60c17ab35ba1b30fd2b37a57c571e252fc6commit | diff
powerpc/perf: Avoid spurious PMU interrupts after idle

POWER9 DD2 can see spurious PMU interrupts after state-loss idle in
some conditions.

A solution is to save and reload MMCR0 over state-loss idle.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Tested-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/kernel/idle_book3s.S diff | blob | history
Linux Kernel Source Tree.