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powerpc/powernv: Fixes for hypervisor doorbell handling

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Since we can now use hypervisor doorbells for host IPIs, this makes
sure we clear the host IPI flag when taking a doorbell interrupt, and
clears any pending doorbell IPI in pnv_smp_cpu_kill_self() (as we
already do for IPIs sent via the XICS interrupt controller).  Otherwise
if there did happen to be a leftover pending doorbell interrupt for
an offline CPU thread for any reason, it would prevent that thread from
going into a power-saving mode; it would instead keep waking up because
of the interrupt.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Paul Mackerras
2015-03-19 19:29:01 +11:00
committed by Michael Ellerman
parent 06e5801b8c
commit 755563bc79
4 changed files with 20 additions and 2 deletions
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3
arch/powerpc/include/asm/reg.h
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@@ -608,13 +608,16 @@
#define SRR1_ISI_N_OR_G 0x10000000 /* ISI: Access is no-exec or G */
#define SRR1_ISI_PROT 0x08000000 /* ISI: Other protection fault */
#define SRR1_WAKEMASK 0x00380000 /* reason for wakeup */
#define SRR1_WAKEMASK_P8 0x003c0000 /* reason for wakeup on POWER8 */
#define SRR1_WAKESYSERR 0x00300000 /* System error */
#define SRR1_WAKEEE 0x00200000 /* External interrupt */
#define SRR1_WAKEMT 0x00280000 /* mtctrl */
#define SRR1_WAKEHMI 0x00280000 /* Hypervisor maintenance */
#define SRR1_WAKEDEC 0x00180000 /* Decrementer interrupt */
#define SRR1_WAKEDBELL 0x00140000 /* Privileged doorbell on P8 */
#define SRR1_WAKETHERM 0x00100000 /* Thermal management interrupt */
#define SRR1_WAKERESET 0x00100000 /* System reset */
#define SRR1_WAKEHDBELL 0x000c0000 /* Hypervisor doorbell on P8 */
#define SRR1_WAKESTATE 0x00030000 /* Powersave exit mask [46:47] */
#define SRR1_WS_DEEPEST 0x00030000 /* Some resources not maintained,
* may not be recoverable */