powerpc/powernv: Always go into nap mode when CPU is offline

The CPU hotplug code for the powernv platform currently only puts
offline CPUs into nap mode if the powersave_nap variable is set.
However, HV-style KVM on this platform requires secondary CPU threads
to be offline and in nap mode.  Since we know nap mode works just
fine on all POWER7 machines, and the only machines that support the
powernv platform are POWER7 machines, this changes the code to
always put offline CPUs into nap mode, regardless of powersave_nap.
Powersave_nap still controls whether or not CPUs go into nap mode
when idle, as before.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 53b6dfa83344a9f3dbe6b68ef72c6d60948f26ab..54b73a28c20579f4f6923e4f9711b5d7dc062205 100644 (file)
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -386,6 +386,7 @@ extern unsigned long cpuidle_disable;
 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
 
 extern int powersave_nap;      /* set if nap mode can be used in idle loop */
+extern void power7_nap(void);
 
 #ifdef CONFIG_PSERIES_IDLE
 extern void update_smt_snooze_delay(int snooze);

diff --git a/arch/powerpc/kernel/idle_power7.S b/arch/powerpc/kernel/idle_power7.S
index 7140d838339e1a9e2ef691ff4079ea022f4d964c..e11863f4e595e2a3302e3ead79b439751ca5d402 100644 (file)
--- a/arch/powerpc/kernel/idle_power7.S
+++ b/arch/powerpc/kernel/idle_power7.S
@@ -28,7 +28,9 @@ _GLOBAL(power7_idle)
        lwz     r4,ADDROFF(powersave_nap)(r3)
        cmpwi   0,r4,0
        beqlr
+       /* fall through */
 
+_GLOBAL(power7_nap)
        /* NAP is a state loss, we create a regs frame on the
         * stack, fill it up with the state we care about and
         * stick a pointer to it in PACAR1. We really only

diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c
index 3ef46254c35ba907dfd9329f9164db3176a9d7a4..7698b6e13c57f6312a7505a3610fbf6b27271991 100644 (file)
--- a/arch/powerpc/platforms/powernv/smp.c
+++ b/arch/powerpc/platforms/powernv/smp.c
@@ -106,14 +106,6 @@ static void pnv_smp_cpu_kill_self(void)
 {
        unsigned int cpu;
 
-       /* If powersave_nap is enabled, use NAP mode, else just
-        * spin aimlessly
-        */
-       if (!powersave_nap) {
-               generic_mach_cpu_die();
-               return;
-       }
-
        /* Standard hot unplug procedure */
        local_irq_disable();
        idle_task_exit();
@@ -128,7 +120,7 @@ static void pnv_smp_cpu_kill_self(void)
         */
        mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) & ~(u64)LPCR_PECE1);
        while (!generic_check_cpu_restart(cpu)) {
-               power7_idle();
+               power7_nap();
                if (!generic_check_cpu_restart(cpu)) {
                        DBG("CPU%d Unexpected exit while offline !\n", cpu);
                        /* We may be getting an IPI, so we re-enable