drm/i915: Move residency calculation into intel_pm.c

Plan is to make generic residency calculation utility
function for usage outside of sysfs. As a first step
move residency calculation into intel_pm.c

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 2ca38ae..a4a2c23 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8349,3 +8349,34 @@ void intel_pm_setup(struct drm_i915_private *dev_priv)
 	dev_priv->pm.suspended = false;
 	atomic_set(&dev_priv->pm.wakeref_count, 0);
 }
+
+u32 intel_rc6_residency(struct drm_i915_private *dev_priv,
+			i915_reg_t reg)
+{
+	u64 raw_time; /* 32b value may overflow during fixed point math */
+	u64 units = 128ULL, div = 100000ULL;
+	u32 ret;
+
+	if (!intel_enable_rc6())
+		return 0;
+
+	intel_runtime_pm_get(dev_priv);
+
+	/* On VLV and CHV, residency time is in CZ units rather than 1.28us */
+	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
+		units = 1;
+		div = dev_priv->czclk_freq;
+
+		if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH)
+			units <<= 8;
+	} else if (IS_GEN9_LP(dev_priv)) {
+		units = 1;
+		div = 1200;		/* 833.33ns */
+	}
+
+	raw_time = I915_READ(reg) * units;
+	ret = DIV_ROUND_UP_ULL(raw_time, div);
+
+	intel_runtime_pm_put(dev_priv);
+	return ret;
+}