drm/nouveau: Add support for basic clockgating on Kepler1

This adds support for enabling automatic clockgating on nvidia GPUs for
Kepler1. While this is not technically a clockgating level, it does
enable clockgating using the clockgating values initially set by the
vbios (which should be safe to use).

This introduces two therm helpers for controlling basic clockgating:
	nvkm_therm_clkgate_enable() - enables clockgating through
	CG_CTRL, done after initializing the GPU fully
	nvkm_therm_clkgate_fini() - prepares clockgating for suspend or
	driver unload

A lot of this code was originally going to be based off of fermi;
however it turns out that while Fermi's the first line of GPUs that
introduced this kind of power saving, Fermi requires more fine tuned
control of the CG_CTRL registers from the driver while reclocking that
we don't entirely understand yet.

For the simple parts we will be sharing with Fermi for certain however,
we at least add those into a new subdev/therm/gf100.h header.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/subdev/therm.h

@@ -85,17 +85,22 @@ struct nvkm_therm {
 
 	int (*attr_get)(struct nvkm_therm *, enum nvkm_therm_attr_type);
 	int (*attr_set)(struct nvkm_therm *, enum nvkm_therm_attr_type, int);
+
+	bool clkgating_enabled;
 };
 
 int nvkm_therm_temp_get(struct nvkm_therm *);
 int nvkm_therm_fan_sense(struct nvkm_therm *);
 int nvkm_therm_cstate(struct nvkm_therm *, int, int);
+void nvkm_therm_clkgate_enable(struct nvkm_therm *);
+void nvkm_therm_clkgate_fini(struct nvkm_therm *, bool);
 
 int nv40_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int nv50_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int g84_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int gt215_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int gf119_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
+int gk104_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int gm107_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int gm200_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int gp100_therm_new(struct nvkm_device *, int, struct nvkm_therm **);

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

@@ -28,6 +28,7 @@
 #include <core/option.h>
 
 #include <subdev/bios.h>
+#include <subdev/therm.h>
 
 static DEFINE_MUTEX(nv_devices_mutex);
 static LIST_HEAD(nv_devices);
@@ -1682,7 +1683,7 @@ nve4_chipset = {
 	.mxm = nv50_mxm_new,
 	.pci = gk104_pci_new,
 	.pmu = gk104_pmu_new,
-	.therm = gf119_therm_new,
+	.therm = gk104_therm_new,
 	.timer = nv41_timer_new,
 	.top = gk104_top_new,
 	.volt = gk104_volt_new,
@@ -1721,7 +1722,7 @@ nve6_chipset = {
 	.mxm = nv50_mxm_new,
 	.pci = gk104_pci_new,
 	.pmu = gk104_pmu_new,
-	.therm = gf119_therm_new,
+	.therm = gk104_therm_new,
 	.timer = nv41_timer_new,
 	.top = gk104_top_new,
 	.volt = gk104_volt_new,
@@ -1760,7 +1761,7 @@ nve7_chipset = {
 	.mxm = nv50_mxm_new,
 	.pci = gk104_pci_new,
 	.pmu = gk104_pmu_new,
-	.therm = gf119_therm_new,
+	.therm = gk104_therm_new,
 	.timer = nv41_timer_new,
 	.top = gk104_top_new,
 	.volt = gk104_volt_new,
@@ -1824,7 +1825,7 @@ nvf0_chipset = {
 	.mxm = nv50_mxm_new,
 	.pci = gk104_pci_new,
 	.pmu = gk110_pmu_new,
-	.therm = gf119_therm_new,
+	.therm = gk104_therm_new,
 	.timer = nv41_timer_new,
 	.top = gk104_top_new,
 	.volt = gk104_volt_new,
@@ -1862,7 +1863,7 @@ nvf1_chipset = {
 	.mxm = nv50_mxm_new,
 	.pci = gk104_pci_new,
 	.pmu = gk110_pmu_new,
-	.therm = gf119_therm_new,
+	.therm = gk104_therm_new,
 	.timer = nv41_timer_new,
 	.top = gk104_top_new,
 	.volt = gk104_volt_new,
@@ -1900,7 +1901,7 @@ nv106_chipset = {
 	.mxm = nv50_mxm_new,
 	.pci = gk104_pci_new,
 	.pmu = gk208_pmu_new,
-	.therm = gf119_therm_new,
+	.therm = gk104_therm_new,
 	.timer = nv41_timer_new,
 	.top = gk104_top_new,
 	.volt = gk104_volt_new,
@@ -1938,7 +1939,7 @@ nv108_chipset = {
 	.mxm = nv50_mxm_new,
 	.pci = gk104_pci_new,
 	.pmu = gk208_pmu_new,
-	.therm = gf119_therm_new,
+	.therm = gk104_therm_new,
 	.timer = nv41_timer_new,
 	.top = gk104_top_new,
 	.volt = gk104_volt_new,
@@ -2513,6 +2514,7 @@ nvkm_device_fini(struct nvkm_device *device, bool suspend)
 		}
 	}
 
+	nvkm_therm_clkgate_fini(device->therm, suspend);
 
 	if (device->func->fini)
 		device->func->fini(device, suspend);
@@ -2602,6 +2604,7 @@ nvkm_device_init(struct nvkm_device *device)
 	}
 
 	nvkm_acpi_init(device);
+	nvkm_therm_clkgate_enable(device->therm);
 
 	time = ktime_to_us(ktime_get()) - time;
 	nvdev_trace(device, "init completed in %lldus\n", time);

drivers/gpu/drm/nouveau/nvkm/subdev/therm/Kbuild

@@ -10,6 +10,7 @@ nvkm-y += nvkm/subdev/therm/nv50.o
 nvkm-y += nvkm/subdev/therm/g84.o
 nvkm-y += nvkm/subdev/therm/gt215.o
 nvkm-y += nvkm/subdev/therm/gf119.o
+nvkm-y += nvkm/subdev/therm/gk104.o
 nvkm-y += nvkm/subdev/therm/gm107.o
 nvkm-y += nvkm/subdev/therm/gm200.o
 nvkm-y += nvkm/subdev/therm/gp100.o

drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c

@@ -21,6 +21,7 @@
  *
  * Authors: Martin Peres
  */
+#include <nvkm/core/option.h>
 #include "priv.h"
 
 int
@@ -297,6 +298,38 @@ nvkm_therm_attr_set(struct nvkm_therm *therm,
 	return -EINVAL;
 }
 
+void
+nvkm_therm_clkgate_enable(struct nvkm_therm *therm)
+{
+	if (!therm->func->clkgate_enable || !therm->clkgating_enabled)
+		return;
+
+	nvkm_debug(&therm->subdev,
+		   "Enabling clockgating\n");
+	therm->func->clkgate_enable(therm);
+}
+
+void
+nvkm_therm_clkgate_fini(struct nvkm_therm *therm, bool suspend)
+{
+	if (!therm->func->clkgate_fini || !therm->clkgating_enabled)
+		return;
+
+	nvkm_debug(&therm->subdev,
+		   "Preparing clockgating for %s\n",
+		   suspend ? "suspend" : "fini");
+	therm->func->clkgate_fini(therm, suspend);
+}
+
+static void
+nvkm_therm_clkgate_oneinit(struct nvkm_therm *therm)
+{
+	if (!therm->func->clkgate_enable || !therm->clkgating_enabled)
+		return;
+
+	nvkm_info(&therm->subdev, "Clockgating enabled\n");
+}
+
 static void
 nvkm_therm_intr(struct nvkm_subdev *subdev)
 {
@@ -333,6 +366,7 @@ nvkm_therm_oneinit(struct nvkm_subdev *subdev)
 	nvkm_therm_fan_ctor(therm);
 	nvkm_therm_fan_mode(therm, NVKM_THERM_CTRL_AUTO);
 	nvkm_therm_sensor_preinit(therm);
+	nvkm_therm_clkgate_oneinit(therm);
 	return 0;
 }
 
@@ -374,15 +408,10 @@ nvkm_therm = {
 	.intr = nvkm_therm_intr,
 };
 
-int
-nvkm_therm_new_(const struct nvkm_therm_func *func, struct nvkm_device *device,
-		int index, struct nvkm_therm **ptherm)
+void
+nvkm_therm_ctor(struct nvkm_therm *therm, struct nvkm_device *device,
+		int index, const struct nvkm_therm_func *func)
 {
-	struct nvkm_therm *therm;
-
-	if (!(therm = *ptherm = kzalloc(sizeof(*therm), GFP_KERNEL)))
-		return -ENOMEM;
-
 	nvkm_subdev_ctor(&nvkm_therm, device, index, &therm->subdev);
 	therm->func = func;
 
@@ -395,5 +424,18 @@ nvkm_therm_new_(const struct nvkm_therm_func *func, struct nvkm_device *device,
 	therm->attr_get = nvkm_therm_attr_get;
 	therm->attr_set = nvkm_therm_attr_set;
 	therm->mode = therm->suspend = -1; /* undefined */
+	therm->clkgating_enabled = false;
+}
+
+int
+nvkm_therm_new_(const struct nvkm_therm_func *func, struct nvkm_device *device,
+		int index, struct nvkm_therm **ptherm)
+{
+	struct nvkm_therm *therm;
+
+	if (!(therm = *ptherm = kzalloc(sizeof(*therm), GFP_KERNEL)))
+		return -ENOMEM;
+
+	nvkm_therm_ctor(therm, device, index, func);
 	return 0;
 }

drivers/gpu/drm/nouveau/nvkm/subdev/therm/gf100.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2018 Red Hat Inc.
+ *
+ * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ * Authors: Lyude Paul
+ */
+
+#ifndef __GF100_THERM_H__
+#define __GF100_THERM_H__
+
+#include <core/device.h>
+
+struct gf100_idle_filter {
+	u32 fecs;
+	u32 hubmmu;
+};
+
+#endif

drivers/gpu/drm/nouveau/nvkm/subdev/therm/gf119.c

@@ -49,7 +49,7 @@ pwm_info(struct nvkm_therm *therm, int line)
 	return -ENODEV;
 }
 
-static int
+int
 gf119_fan_pwm_ctrl(struct nvkm_therm *therm, int line, bool enable)
 {
 	struct nvkm_device *device = therm->subdev.device;
@@ -63,7 +63,7 @@ gf119_fan_pwm_ctrl(struct nvkm_therm *therm, int line, bool enable)
 	return 0;
 }
 
-static int
+int
 gf119_fan_pwm_get(struct nvkm_therm *therm, int line, u32 *divs, u32 *duty)
 {
 	struct nvkm_device *device = therm->subdev.device;
@@ -85,7 +85,7 @@ gf119_fan_pwm_get(struct nvkm_therm *therm, int line, u32 *divs, u32 *duty)
 	return -EINVAL;
 }
 
-static int
+int
 gf119_fan_pwm_set(struct nvkm_therm *therm, int line, u32 divs, u32 duty)
 {
 	struct nvkm_device *device = therm->subdev.device;
@@ -102,7 +102,7 @@ gf119_fan_pwm_set(struct nvkm_therm *therm, int line, u32 divs, u32 duty)
 	return 0;
 }
 
-static int
+int
 gf119_fan_pwm_clock(struct nvkm_therm *therm, int line)
 {
 	struct nvkm_device *device = therm->subdev.device;