[PATCH v4 07/25] drm/i915/slpc: Use intel_slpc_* functions if supported

[Sagar Arun Kamble <sagar.a.kamble@intel.com>]

From: Tom O'Rourke <Tom.O'Rourke@intel.com>

On platforms with SLPC support: call intel_slpc_*()
functions from corresponding intel_*_gt_powersave()
functions; and do not use rps functions.

v1: Return void instead of ignored error code (Paulo)
    enable/disable RC6 in SLPC flows (Sagar)
    replace HAS_SLPC() use with intel_slpc_enabled()
	or intel_slpc_active() (Paulo)
    Fix for renaming gen9_disable_rps to gen9_disable_rc6 in
    "drm/i915/bxt: Explicitly clear the Turbo control register"
    Defer RC6 and SLPC enabling to intel_gen6_powersave_work. (Sagar)
    Performance drop with SLPC was happening as ring frequency table
    was not programmed when SLPC was enabled. This patch programs ring
    frequency table with SLPC. Initial reset of SLPC is based on kernel
    parameter as planning to add slpc state in intel_slpc_active. Cleanup
    is also based on kernel parameter as SLPC gets disabled in
    disable/suspend.(Sagar)

v2: Usage of INTEL_GEN instead of INTEL_INFO->gen (David)
    Checkpatch update.

v3: Rebase

v4: Removed reset functions to comply with *_gt_powersave routines.
    (Sagar)

Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
---
 drivers/gpu/drm/i915/Makefile     |  3 +-
 drivers/gpu/drm/i915/intel_drv.h  |  4 ++
 drivers/gpu/drm/i915/intel_guc.h  |  1 +
 drivers/gpu/drm/i915/intel_pm.c   | 96 +++++++++++++++++++++++++++------------
 drivers/gpu/drm/i915/intel_slpc.c | 46 +++++++++++++++++++
 drivers/gpu/drm/i915/intel_slpc.h | 34 ++++++++++++++
 6 files changed, 153 insertions(+), 31 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/intel_slpc.c
 create mode 100644 drivers/gpu/drm/i915/intel_slpc.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index a7da246..229290d 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -52,7 +52,8 @@ i915-y += i915_cmd_parser.o \
 
 # general-purpose microcontroller (GuC) support
 i915-y += intel_guc_loader.o \
-	  i915_guc_submission.o
+	  i915_guc_submission.o \
+	  intel_slpc.o
 
 # autogenerated null render state
 i915-y += intel_renderstate_gen6.o \
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 570a7ca..6f9480b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1712,6 +1712,10 @@ void chv_phy_powergate_lanes(struct intel_encoder *encoder,
 bool chv_phy_powergate_ch(struct drm_i915_private *dev_priv, enum dpio_phy phy,
 			  enum dpio_channel ch, bool override);
 
+static inline int intel_slpc_active(struct drm_i915_private *dev_priv)
+{
+	return 0;
+}
 
 /* intel_pm.c */
 void intel_init_clock_gating(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index d73e4ed..83dec66 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -27,6 +27,7 @@
 #include "intel_guc_fwif.h"
 #include "i915_guc_reg.h"
 #include "intel_ringbuffer.h"
+#include "intel_slpc.h"
 
 struct drm_i915_gem_request;
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 56bde62..db5c4ef 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4988,7 +4988,8 @@ void gen6_rps_idle(struct drm_i915_private *dev_priv)
 	 * our rpm wakeref. And then disable the interrupts to stop any
 	 * futher RPS reclocking whilst we are asleep.
 	 */
-	gen6_disable_rps_interrupts(dev_priv);
+	if (!intel_slpc_active(dev_priv))
+		gen6_disable_rps_interrupts(dev_priv);
 
 	mutex_lock(&dev_priv->rps.hw_lock);
 	if (dev_priv->rps.enabled) {
@@ -6641,6 +6642,9 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
 	/* Finally allow us to boost to max by default */
 	dev_priv->rps.boost_freq = dev_priv->rps.max_freq;
 
+	if (intel_slpc_enabled())
+		intel_slpc_init(dev_priv);
+
 	mutex_unlock(&dev_priv->rps.hw_lock);
 	mutex_unlock(&dev_priv->drm.struct_mutex);
 
@@ -6649,7 +6653,9 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
 
 void intel_cleanup_gt_powersave(struct drm_i915_private *dev_priv)
 {
-	if (IS_VALLEYVIEW(dev_priv))
+	if (intel_slpc_enabled())
+		intel_slpc_cleanup(dev_priv);
+	else if (IS_VALLEYVIEW(dev_priv))
 		valleyview_cleanup_gt_powersave(dev_priv);
 
 	if (!i915.enable_rc6)
@@ -6673,24 +6679,38 @@ void intel_suspend_gt_powersave(struct drm_i915_private *dev_priv)
 		intel_runtime_pm_put(dev_priv);
 
 	/* gen6_rps_idle() will be called later to disable interrupts */
+
+	if (intel_slpc_active(dev_priv))
+		intel_slpc_suspend(dev_priv);
 }
 
 void intel_sanitize_gt_powersave(struct drm_i915_private *dev_priv)
 {
-	dev_priv->rps.enabled = true; /* force disabling */
-	intel_disable_gt_powersave(dev_priv);
+	if (intel_slpc_enabled()) {
+		/* TODO: Set SLPC enabled forcefully */
+		intel_disable_gt_powersave(dev_priv);
+	} else {
+		dev_priv->rps.enabled = true; /* force disabling */
+		intel_disable_gt_powersave(dev_priv);
 
-	gen6_reset_rps_interrupts(dev_priv);
+		gen6_reset_rps_interrupts(dev_priv);
+	}
 }
 
 void intel_disable_gt_powersave(struct drm_i915_private *dev_priv)
 {
-	if (!READ_ONCE(dev_priv->rps.enabled))
+	if (intel_slpc_enabled()) {
+		if (!intel_slpc_active(dev_priv))
+			return;
+	} else if (!READ_ONCE(dev_priv->rps.enabled))
 		return;
 
 	mutex_lock(&dev_priv->rps.hw_lock);
 
-	if (INTEL_GEN(dev_priv) >= 9) {
+	if (intel_slpc_active(dev_priv)) {
+		gen9_disable_rc6(dev_priv);
+		intel_slpc_disable(dev_priv);
+	} else if (INTEL_GEN(dev_priv) >= 9) {
 		gen9_disable_rc6(dev_priv);
 		gen9_disable_rps(dev_priv);
 	} else if (IS_CHERRYVIEW(dev_priv)) {
@@ -6711,7 +6731,10 @@ void intel_enable_gt_powersave(struct drm_i915_private *dev_priv)
 	/* We shouldn't be disabling as we submit, so this should be less
 	 * racy than it appears!
 	 */
-	if (READ_ONCE(dev_priv->rps.enabled))
+	if (intel_slpc_enabled()) {
+		if (intel_slpc_active(dev_priv))
+			return;
+	} else if (READ_ONCE(dev_priv->rps.enabled))
 		return;
 
 	/* Powersaving is controlled by the host when inside a VM */
@@ -6720,31 +6743,38 @@ void intel_enable_gt_powersave(struct drm_i915_private *dev_priv)
 
 	mutex_lock(&dev_priv->rps.hw_lock);
 
-	if (IS_CHERRYVIEW(dev_priv)) {
-		cherryview_enable_rps(dev_priv);
-	} else if (IS_VALLEYVIEW(dev_priv)) {
-		valleyview_enable_rps(dev_priv);
-	} else if (INTEL_GEN(dev_priv) >= 9) {
+	if (intel_slpc_enabled()) {
 		gen9_enable_rc6(dev_priv);
-		gen9_enable_rps(dev_priv);
+		intel_slpc_enable(dev_priv);
 		if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
 			gen6_update_ring_freq(dev_priv);
-	} else if (IS_BROADWELL(dev_priv)) {
-		gen8_enable_rps(dev_priv);
-		gen6_update_ring_freq(dev_priv);
-	} else if (INTEL_GEN(dev_priv) >= 6) {
-		gen6_enable_rps(dev_priv);
-		gen6_update_ring_freq(dev_priv);
-	} else if (IS_IRONLAKE_M(dev_priv)) {
-		ironlake_enable_drps(dev_priv);
-		intel_init_emon(dev_priv);
-	}
+	} else {
+		if (IS_CHERRYVIEW(dev_priv)) {
+			cherryview_enable_rps(dev_priv);
+		} else if (IS_VALLEYVIEW(dev_priv)) {
+			valleyview_enable_rps(dev_priv);
+		} else if (INTEL_GEN(dev_priv) >= 9) {
+			gen9_enable_rc6(dev_priv);
+			gen9_enable_rps(dev_priv);
+			if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
+				gen6_update_ring_freq(dev_priv);
+		} else if (IS_BROADWELL(dev_priv)) {
+			gen8_enable_rps(dev_priv);
+			gen6_update_ring_freq(dev_priv);
+		} else if (INTEL_GEN(dev_priv) >= 6) {
+			gen6_enable_rps(dev_priv);
+			gen6_update_ring_freq(dev_priv);
+		} else if (IS_IRONLAKE_M(dev_priv)) {
+			ironlake_enable_drps(dev_priv);
+			intel_init_emon(dev_priv);
+		}
 
-	WARN_ON(dev_priv->rps.max_freq < dev_priv->rps.min_freq);
-	WARN_ON(dev_priv->rps.idle_freq > dev_priv->rps.max_freq);
+		WARN_ON(dev_priv->rps.max_freq < dev_priv->rps.min_freq);
+		WARN_ON(dev_priv->rps.idle_freq > dev_priv->rps.max_freq);
 
-	WARN_ON(dev_priv->rps.efficient_freq < dev_priv->rps.min_freq);
-	WARN_ON(dev_priv->rps.efficient_freq > dev_priv->rps.max_freq);
+		WARN_ON(dev_priv->rps.efficient_freq < dev_priv->rps.min_freq);
+		WARN_ON(dev_priv->rps.efficient_freq > dev_priv->rps.max_freq);
+	}
 
 	mutex_unlock(&dev_priv->rps.hw_lock);
 }
@@ -6756,7 +6786,10 @@ static void __intel_autoenable_gt_powersave(struct work_struct *work)
 	struct intel_engine_cs *rcs;
 	struct drm_i915_gem_request *req;
 
-	if (READ_ONCE(dev_priv->rps.enabled))
+	if (intel_slpc_enabled()) {
+		if (intel_slpc_active(dev_priv))
+			goto out;
+	} else if (READ_ONCE(dev_priv->rps.enabled))
 		goto out;
 
 	rcs = &dev_priv->engine[RCS];
@@ -6786,7 +6819,10 @@ out:
 
 void intel_autoenable_gt_powersave(struct drm_i915_private *dev_priv)
 {
-	if (READ_ONCE(dev_priv->rps.enabled))
+	if (intel_slpc_enabled()) {
+		if (intel_slpc_active(dev_priv))
+			return;
+	} else if (READ_ONCE(dev_priv->rps.enabled))
 		return;
 
 	if (IS_IRONLAKE_M(dev_priv)) {
diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
new file mode 100644
index 0000000..be9e84c
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_slpc.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+#include <linux/firmware.h>
+#include "i915_drv.h"
+#include "intel_guc.h"
+
+void intel_slpc_init(struct drm_i915_private *dev_priv)
+{
+}
+
+void intel_slpc_cleanup(struct drm_i915_private *dev_priv)
+{
+}
+
+void intel_slpc_suspend(struct drm_i915_private *dev_priv)
+{
+}
+
+void intel_slpc_disable(struct drm_i915_private *dev_priv)
+{
+}
+
+void intel_slpc_enable(struct drm_i915_private *dev_priv)
+{
+}
diff --git a/drivers/gpu/drm/i915/intel_slpc.h b/drivers/gpu/drm/i915/intel_slpc.h
new file mode 100644
index 0000000..28296f1
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_slpc.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+#ifndef _INTEL_SLPC_H_
+#define _INTEL_SLPC_H_
+
+/* intel_slpc.c */
+void intel_slpc_init(struct drm_i915_private *dev_priv);
+void intel_slpc_cleanup(struct drm_i915_private *dev_priv);
+void intel_slpc_suspend(struct drm_i915_private *dev_priv);
+void intel_slpc_disable(struct drm_i915_private *dev_priv);
+void intel_slpc_enable(struct drm_i915_private *dev_priv);
+
+#endif
-- 
1.9.1

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