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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-06-22 15:15:36 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-06-22 15:15:36 +0200
commitd461003574ebc862c2dae70c9e1ab32b1bf2cda1 (patch)
treeb21087119310109933891c42be92f5348b12a922 /drivers
parent3bcda76d9d1c0c4e70d5e3b7a962e46de2e79b61 (diff)
parent78eaa10f027cf69f9bd409e64eaff902172b2327 (diff)
downloadlinux-d461003574ebc862c2dae70c9e1ab32b1bf2cda1.tar.bz2
Merge branch 'pm-cpuidle'
* pm-cpuidle: cpuidle: powernv/pseries: Auto-promotion of snooze to deeper idle state
Diffstat (limited to 'drivers')
-rw-r--r--drivers/cpuidle/cpuidle-powernv.c12
-rw-r--r--drivers/cpuidle/cpuidle-pseries.c11
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 59372077ec7c..1e3ef5ec4784 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -29,18 +29,25 @@ struct cpuidle_driver powernv_idle_driver = {
static int max_idle_state;
static struct cpuidle_state *cpuidle_state_table;
+static u64 snooze_timeout;
+static bool snooze_timeout_en;
static int snooze_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
+ u64 snooze_exit_time;
+
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
+ snooze_exit_time = get_tb() + snooze_timeout;
ppc64_runlatch_off();
while (!need_resched()) {
HMT_low();
HMT_very_low();
+ if (snooze_timeout_en && get_tb() > snooze_exit_time)
+ break;
}
HMT_medium();
@@ -252,6 +259,11 @@ static int powernv_idle_probe(void)
cpuidle_state_table = powernv_states;
/* Device tree can indicate more idle states */
max_idle_state = powernv_add_idle_states();
+ if (max_idle_state > 1) {
+ snooze_timeout_en = true;
+ snooze_timeout = powernv_states[1].target_residency *
+ tb_ticks_per_usec;
+ }
} else
return -ENODEV;
diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c
index bb9e2b6f3ecc..07135e009d8b 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c
@@ -27,6 +27,8 @@ struct cpuidle_driver pseries_idle_driver = {
static int max_idle_state;
static struct cpuidle_state *cpuidle_state_table;
+static u64 snooze_timeout;
+static bool snooze_timeout_en;
static inline void idle_loop_prolog(unsigned long *in_purr)
{
@@ -58,14 +60,18 @@ static int snooze_loop(struct cpuidle_device *dev,
int index)
{
unsigned long in_purr;
+ u64 snooze_exit_time;
idle_loop_prolog(&in_purr);
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
+ snooze_exit_time = get_tb() + snooze_timeout;
while (!need_resched()) {
HMT_low();
HMT_very_low();
+ if (snooze_timeout_en && get_tb() > snooze_exit_time)
+ break;
}
HMT_medium();
@@ -244,6 +250,11 @@ static int pseries_idle_probe(void)
} else
return -ENODEV;
+ if (max_idle_state > 1) {
+ snooze_timeout_en = true;
+ snooze_timeout = cpuidle_state_table[1].target_residency *
+ tb_ticks_per_usec;
+ }
return 0;
}