[RFC PATCH V3 4/5] powerpc/cpuidle: Enable powernv cpuidle support.

[Deepthi Dharwar]

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

Signed-off-by: Deepthi Dharwar <deep...@linux.vnet.ibm.com>
---
 drivers/cpuidle/cpuidle-powerpc.c |   36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-powerpc.c 
b/drivers/cpuidle/cpuidle-powerpc.c
index 5756085..e1cf599 100644
--- a/drivers/cpuidle/cpuidle-powerpc.c
+++ b/drivers/cpuidle/cpuidle-powerpc.c
@@ -53,7 +53,9 @@ static int snooze_loop(struct cpuidle_device *dev,
 {
        unsigned long in_purr;
 
-       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);
 
@@ -67,7 +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;
 }
@@ -130,6 +133,15 @@ 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.
  */
@@ -163,6 +175,23 @@ static struct cpuidle_state 
shared_states[MAX_IDLE_STATE_COUNT] = {
                .enter = &shared_cede_loop },
 };
 
+static struct cpuidle_state powernv_states[MAX_IDLE_STATE_COUNT] = {
+       { /* 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();
@@ -282,7 +311,6 @@ static int powerpc_idle_devices_init(void)
                        return -EIO;
                }
        }
-
        return 0;
 }
 
@@ -309,6 +337,8 @@ static int powerpc_idle_probe(void)
                        cpuidle_state_table = shared_states;
                else if (get_lppaca_is_shared_proc() == 0)
                        cpuidle_state_table = dedicated_states;
+       } else if (firmware_has_feature(FW_FEATURE_OPALv3)) {
+                       cpuidle_state_table = powernv_states;
        } else
                return -ENODEV;
 

_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev