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authorMarcelo Tosatti <mtosatti@redhat.com>2019-07-03 20:51:26 -0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-07-30 17:27:37 +0200
commit259231a045616c4101d023a8f4dcc8379af265a6 (patch)
tree633877050928b1b22ee77920d79b5bc548f29471 /drivers/cpuidle/cpuidle.c
parentfa86ee90eb1111267de67cb4272b5ce711f18cbb (diff)
downloadlinux-259231a045616c4101d023a8f4dcc8379af265a6.tar.bz2
cpuidle: add poll_limit_ns to cpuidle_device structure
Add a poll_limit_ns variable to cpuidle_device structure. Calculate and configure it in the new cpuidle_poll_time function, in case its zero. Individual governors are allowed to override this value. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle/cpuidle.c')
-rw-r--r--drivers/cpuidle/cpuidle.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 0f4b7c45df3e..0895b988fa92 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -362,6 +362,36 @@ void cpuidle_reflect(struct cpuidle_device *dev, int index)
}
/**
+ * cpuidle_poll_time - return amount of time to poll for,
+ * governors can override dev->poll_limit_ns if necessary
+ *
+ * @drv: the cpuidle driver tied with the cpu
+ * @dev: the cpuidle device
+ *
+ */
+u64 cpuidle_poll_time(struct cpuidle_driver *drv,
+ struct cpuidle_device *dev)
+{
+ int i;
+ u64 limit_ns;
+
+ if (dev->poll_limit_ns)
+ return dev->poll_limit_ns;
+
+ limit_ns = TICK_NSEC;
+ for (i = 1; i < drv->state_count; i++) {
+ if (drv->states[i].disabled || dev->states_usage[i].disable)
+ continue;
+
+ limit_ns = (u64)drv->states[i].target_residency * NSEC_PER_USEC;
+ }
+
+ dev->poll_limit_ns = limit_ns;
+
+ return dev->poll_limit_ns;
+}
+
+/**
* cpuidle_install_idle_handler - installs the cpuidle idle loop handler
*/
void cpuidle_install_idle_handler(void)