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 | 35 +++++++++++++++++++++++++++++++++--
1 file changed, 33 insertions(+), 2 deletions(-)
diff --git a/drivers/cpuidle/cpuidle-powerpc.c
b/drivers/cpuidle/cpuidle-powerpc.c
index 3662aba..973de6a 100644
--- a/drivers/cpuidle/cpuidle-powerpc.c
+++ b/drivers/cpuidle/cpuidle-powerpc.c
@@ -52,7 +52,9 @@ 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);
@@ -66,7 +68,8 @@ 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;
}
@@ -129,6 +132,15 @@ 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.
*/
@@ -162,6 +174,23 @@ 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();
@@ -261,6 +290,8 @@ 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;
--
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