On Thu, Feb 23, 2017 at 9:54 PM, Vaidyanathan Srinivasan <sva...@linux.vnet.ibm.com> wrote: > Offline CPUs need to receive IPIs through XIVE when they are > in stop state and wakeup from that state. > > Reduce interrupt receive priority in order to receive XIVE > wakeup interrupts when in offline state. > > LOWEST_PRIORITY would allow all interrupts to be delivered > as wakeup events. > > Signed-off-by: Vaidyanathan Srinivasan <sva...@linux.vnet.ibm.com> > --- > arch/powerpc/sysdev/xics/xics-common.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/sysdev/xics/xics-common.c > b/arch/powerpc/sysdev/xics/xics-common.c > index 69d858e..c674a9d 100644 > --- a/arch/powerpc/sysdev/xics/xics-common.c > +++ b/arch/powerpc/sysdev/xics/xics-common.c > @@ -199,7 +199,7 @@ void xics_migrate_irqs_away(void) > xics_set_cpu_giq(xics_default_distrib_server, 0); > > /* Allow IPIs again... */ > - icp_ops->set_priority(DEFAULT_PRIORITY); > + icp_ops->set_priority(LOWEST_PRIORITY); >
Aren't IPI's at higher priority than DEFAULT_PRIORITY? Like Mikey said I am not sure what is broken with the current implementation? Is this true for all icp_ops? I presume you are using icp_opal. I suspect you'll need to look at 1. XIVE to see if EMULATION_PRIO is the issue 2. Check if only icp_opal is impacted Balbir Singh.
