cpuidle/powerpc: Fix smt_snooze_delay functionality.

smt_snooze_delay was designed to  delay idle loop's nap entry
in the native idle code before it got  ported over to use as part of
the cpuidle framework.

A -ve value  assigned to smt_snooze_delay should result in
busy looping, in other words disabling the entry to nap state.

	- https://lists.ozlabs.org/pipermail/linuxppc-dev/2010-May/082450.html

This particular functionality can be achieved currently by
echo 1 > /sys/devices/system/cpu/cpu*/state1/disable
but it is broken when one assigns -ve value to  the smt_snooze_delay
variable either via sysfs entry or ppc64_cpu util.

This patch aims to fix this, by disabling nap state when smt_snooze_delay
variable is set to -ve value.

Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
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 8734b38..8750204 100644 (file)
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -388,9 +388,9 @@ 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);
+extern void update_smt_snooze_delay(int cpu, int residency);
 #else
-static inline void update_smt_snooze_delay(int snooze) {}
+static inline void update_smt_snooze_delay(int cpu, int residency) {}
 #endif
 
 extern void flush_instruction_cache(void);

diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 8302af6..cf357a0 100644 (file)
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -50,7 +50,7 @@ static ssize_t store_smt_snooze_delay(struct device *dev,
                return -EINVAL;
 
        per_cpu(smt_snooze_delay, cpu->dev.id) = snooze;
-       update_smt_snooze_delay(snooze);
+       update_smt_snooze_delay(cpu->dev.id, snooze);
 
        return count;
 }

diff --git a/arch/powerpc/platforms/pseries/processor_idle.c b/arch/powerpc/platforms/pseries/processor_idle.c
index 02e425a..a32d56d 100644 (file)
--- a/arch/powerpc/platforms/pseries/processor_idle.c
+++ b/arch/powerpc/platforms/pseries/processor_idle.c
@@ -33,13 +33,6 @@ static int max_idle_state = MAX_IDLE_STATE_COUNT - 1;
 static struct cpuidle_device __percpu *pseries_cpuidle_devices;
 static struct cpuidle_state *cpuidle_state_table;
 
-void update_smt_snooze_delay(int snooze)
-{
-       struct cpuidle_driver *drv = cpuidle_get_driver();
-       if (drv)
-               drv->states[0].target_residency = snooze;
-}
-
 static inline void idle_loop_prolog(unsigned long *in_purr, ktime_t *kt_before)
 {
 
@@ -190,6 +183,23 @@ static struct cpuidle_state shared_states[MAX_IDLE_STATE_COUNT] = {
                .enter = &shared_cede_loop },
 };
 
+void update_smt_snooze_delay(int cpu, int residency)
+{
+       struct cpuidle_driver *drv = cpuidle_get_driver();
+       struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu);
+
+       if (cpuidle_state_table != dedicated_states)
+               return;
+
+       if (residency < 0) {
+               /* Disable the Nap state on that cpu */
+               if (dev)
+                       dev->states_usage[1].disable = 1;
+       } else
+               if (drv)
+                       drv->states[0].target_residency = residency;
+}
+
 static int pseries_cpuidle_add_cpu_notifier(struct notifier_block *n,
                        unsigned long action, void *hcpu)
 {