drm/i915: add assert_rpm_wakelock_held helper

As a preparation for follow-up patches add a new helper that checks
whether we hold an RPM reference, since this is what we want most of
the cases. Atm this helper will only check for the HW suspended state, a
follow-up patch will do the actual change to check the refcount instead.
One exception is the forcewake release timer function, where it's
guaranteed that the HW is on even though the RPM refcount drops to zero.
This guarantee is provided by flushing the timer in the runtime suspend
handler. So leave the assert_device_not_suspended check in place there.

Also rename assert_device_suspended for consistency and export these
helpers as a preparation for the follow-up patches.

No functional change.

v3:
- change the assert warning message to be more meaningful (Chris)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1450203038-5150-6-git-send-email-imre.deak@intel.com

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 798463e..9837a25 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1430,6 +1430,20 @@ void intel_display_power_get(struct drm_i915_private *dev_priv,
 			     enum intel_display_power_domain domain);
 void intel_display_power_put(struct drm_i915_private *dev_priv,
 			     enum intel_display_power_domain domain);
+
+static inline void
+assert_rpm_device_not_suspended(struct drm_i915_private *dev_priv)
+{
+	WARN_ONCE(dev_priv->pm.suspended,
+		  "Device suspended during HW access\n");
+}
+
+static inline void
+assert_rpm_wakelock_held(struct drm_i915_private *dev_priv)
+{
+	assert_rpm_device_not_suspended(dev_priv);
+}
+
 void intel_runtime_pm_get(struct drm_i915_private *dev_priv);
 void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv);
 void intel_runtime_pm_put(struct drm_i915_private *dev_priv);