[PATCH v8 6/7] POWER/cpuidle: Enable powernv cpuidle support.

[Deepthi Dharwar]

The following patch extends the current powerpc-book3s backend
idle driver to the powernv platform.

Signed-off-by: Deepthi Dharwar <deep...@linux.vnet.ibm.com>
Acked-by: Daniel Lezcano <daniel.lezc...@linaro.org>
---
 drivers/cpuidle/cpuidle-powerpc-book3s.c |   39 ++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 3 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-powerpc-book3s.c 
b/drivers/cpuidle/cpuidle-powerpc-book3s.c
index 7b785ff..25e8a99 100644
--- a/drivers/cpuidle/cpuidle-powerpc-book3s.c
+++ b/drivers/cpuidle/cpuidle-powerpc-book3s.c
@@ -52,9 +52,10 @@ static int snooze_loop(struct cpuidle_device *dev,
                        struct cpuidle_driver *drv,
                        int index)
 {
-       unsigned long in_purr;
+       unsigned long in_purr = 0;
 
-       idle_loop_prolog(&in_purr);
+       if (firmware_has_feature(FW_FEATURE_SPLPAR))
+               idle_loop_prolog(&in_purr);
        local_irq_enable();
        set_thread_flag(TIF_POLLING_NRFLAG);
 
@@ -68,7 +69,8 @@ static int snooze_loop(struct cpuidle_device *dev,
        clear_thread_flag(TIF_POLLING_NRFLAG);
        smp_mb();
 
-       idle_loop_epilog(in_purr);
+       if (firmware_has_feature(FW_FEATURE_SPLPAR))
+               idle_loop_epilog(in_purr);
 
        return index;
 }
@@ -132,6 +134,15 @@ static int shared_cede_loop(struct cpuidle_device *dev,
        return index;
 }
 
+static int nap_loop(struct cpuidle_device *dev,
+                       struct cpuidle_driver *drv,
+                       int index)
+{
+       ppc64_runlatch_off();
+       power7_idle();
+       return index;
+}
+
 /*
  * States for dedicated partition case.
  */
@@ -165,6 +176,23 @@ static struct cpuidle_state shared_states[] = {
                .enter = &shared_cede_loop },
 };
 
+static struct cpuidle_state powernv_states[] = {
+       { /* Snooze */
+               .name = "snooze",
+               .desc = "snooze",
+               .flags = CPUIDLE_FLAG_TIME_VALID,
+               .exit_latency = 0,
+               .target_residency = 0,
+               .enter = &snooze_loop },
+       { /* NAP */
+               .name = "NAP",
+               .desc = "NAP",
+               .flags = CPUIDLE_FLAG_TIME_VALID,
+               .exit_latency = 10,
+               .target_residency = 100,
+               .enter = &nap_loop },
+};
+
 void update_smt_snooze_delay(int cpu, int residency)
 {
        struct cpuidle_driver *drv = cpuidle_get_driver();
@@ -258,6 +286,11 @@ static int powerpc_book3s_idle_probe(void)
                        cpuidle_state_table = dedicated_states;
                        max_idle_state = ARRAY_SIZE(dedicated_states);
                }
+
+       } else if (firmware_has_feature(FW_FEATURE_OPALv3)) {
+               cpuidle_state_table = powernv_states;
+               max_idle_state = ARRAY_SIZE(powernv_states);
+
        } else
                return -ENODEV;
 

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