powerpc/pseries: Only call start-cpu when a CPU is stopped

Currently we always call start-cpu irrespective of if the CPU is
stopped or not. Unfortunatley on POWER7, firmware seems to not like
start-cpu being called when a cpu already been started.  This was not
the case on POWER6 and earlier.

This patch checks to see if the CPU is stopped or not via an
query-cpu-stopped-state call, and only calls start-cpu on CPUs which
are stopped.

This fixes a bug with kexec on POWER7 on PHYP where only the primary
thread would make it to the second kernel.

Reported-by: Ankita Garg <ankita@linux.vnet.ibm.com>
Cc: <stable@kernel.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c
index 20b6942..8979982 100644 (file)
--- a/arch/powerpc/platforms/pseries/smp.c
+++ b/arch/powerpc/platforms/pseries/smp.c
@@ -104,6 +104,12 @@ static inline int __devinit smp_startup_cpu(unsigned int lcpu)
 
        pcpu = get_hard_smp_processor_id(lcpu);
 
+       /* Check to see if the CPU out of FW already for kexec */
+       if (smp_query_cpu_stopped(pcpu) == QCSS_NOT_STOPPED){
+               cpu_set(lcpu, of_spin_map);
+               return 1;
+       }
+
        /* Fixup atomic count: it exited inside IRQ handler. */
        task_thread_info(paca[lcpu].__current)->preempt_count   = 0;