drm/nouveau: Add support for BLCG on Kepler1

This enables BLCG optimization for kepler1. When using clockgating,
nvidia's firmware has a set of registers which are initially programmed
by the vbios with various engine delays and other mysterious settings
that are safe enough to bring up the GPU. However, the values used by
the vbios are more power hungry then they need to be, so the nvidia driver
writes it's own more optimized set of BLCG settings before enabling
CG_CTRL. This adds support for programming the optimized BLCG values
during engine/subdev init, which enables rather significant power
savings.

This introduces the nvkm_therm_clkgate_init() helper, which we use to
program the optimized BLCG settings before enabling clockgating with
nvkm_therm_clkgate_enable.

As well, this commit shares a lot more code with Fermi since BLCG is
mostly the same there as far as we can tell. In the future, it's likely
we'll reformat the clkgate_packs for kepler1 so that they share a list
of mmio packs with Fermi.

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

6 files changed, 77 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/Kbuild b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/Kbuild
index 4bac4772d8ed..550702eab0b1 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/Kbuild
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/Kbuild
@@ -9,6 +9,7 @@ nvkm-y += nvkm/subdev/therm/nv40.o
 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/gf100.o
 nvkm-y += nvkm/subdev/therm/gf119.o
 nvkm-y += nvkm/subdev/therm/gk104.o
 nvkm-y += nvkm/subdev/therm/gm107.o
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
index cf1d5af30f5f..de07bc07abdb 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
@@ -391,6 +391,16 @@ nvkm_therm_init(struct nvkm_subdev *subdev)
 	return 0;
 }
 
+void
+nvkm_therm_clkgate_init(struct nvkm_therm *therm,
+			const struct nvkm_therm_clkgate_pack *p)
+{
+	if (!therm->func->clkgate_init || !therm->clkgating_enabled)
+		return;
+
+	therm->func->clkgate_init(therm, p);
+}
+
 static void *
 nvkm_therm_dtor(struct nvkm_subdev *subdev)
 {
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gf100.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gf100.c
new file mode 100644
index 000000000000..5ae6913320e8
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gf100.c
@@ -0,0 +1,58 @@
+/*
+ * 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
+ */
+#include <core/device.h>
+
+#include "priv.h"
+
+#define pack_for_each_init(init, pack, head)                          \
+	for (pack = head; pack && pack->init; pack++)                 \
+		  for (init = pack->init; init && init->count; init++)
+void
+gf100_clkgate_init(struct nvkm_therm *therm,
+		   const struct nvkm_therm_clkgate_pack *p)
+{
+	struct nvkm_device *device = therm->subdev.device;
+	const struct nvkm_therm_clkgate_pack *pack;
+	const struct nvkm_therm_clkgate_init *init;
+	u32 next, addr;
+
+	pack_for_each_init(init, pack, p) {
+		next = init->addr + init->count * 8;
+		addr = init->addr;
+
+		nvkm_trace(&therm->subdev, "{ 0x%06x, %d, 0x%08x }\n",
+			   init->addr, init->count, init->data);
+		while (addr < next) {
+			nvkm_trace(&therm->subdev, "\t0x%06x = 0x%08x\n",
+				   addr, init->data);
+			nvkm_wr32(device, addr, init->data);
+			addr += 8;
+		}
+	}
+}
+
+/*
+ * TODO: Fermi clockgating isn't understood fully yet, so we don't specify any
+ * clockgate functions to use
+ */
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gk104.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gk104.c
index 79806a757893..4e03971d2e3d 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gk104.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gk104.c
@@ -100,6 +100,7 @@ gk104_therm_func = {
 	.temp_get = g84_temp_get,
 	.fan_sense = gt215_therm_fan_sense,
 	.program_alarms = nvkm_therm_program_alarms_polling,
+	.clkgate_init = gf100_clkgate_init,
 	.clkgate_enable = gk104_clkgate_enable,
 	.clkgate_fini = gk104_clkgate_fini,
 };
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gt215.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gt215.c
index c08097f2aff5..4caf401d001a 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gt215.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gt215.c
@@ -36,7 +36,7 @@ gt215_therm_fan_sense(struct nvkm_therm *therm)
 	return -ENODEV;
 }
 
-static void
+void
 gt215_therm_init(struct nvkm_therm *therm)
 {
 	struct nvkm_device *device = therm->subdev.device;
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/priv.h b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/priv.h
index f30202dd88e7..21659daf1864 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/priv.h
@@ -97,6 +97,8 @@ struct nvkm_therm_func {
 
 	void (*program_alarms)(struct nvkm_therm *);
 
+	void (*clkgate_init)(struct nvkm_therm *,
+			     const struct nvkm_therm_clkgate_pack *);
 	void (*clkgate_enable)(struct nvkm_therm *);
 	void (*clkgate_fini)(struct nvkm_therm *, bool);
 };
@@ -114,6 +116,9 @@ void g84_therm_fini(struct nvkm_therm *);
 
 int gt215_therm_fan_sense(struct nvkm_therm *);
 
+void gf100_clkgate_init(struct nvkm_therm *,
+			const struct nvkm_therm_clkgate_pack *);
+
 void g84_therm_init(struct nvkm_therm *);
 
 int gf119_fan_pwm_ctrl(struct nvkm_therm *, int, bool);
@@ -122,6 +127,7 @@ int gf119_fan_pwm_set(struct nvkm_therm *, int, u32, u32);
 int gf119_fan_pwm_clock(struct nvkm_therm *, int);
 void gf119_therm_init(struct nvkm_therm *);
 
+void gk104_therm_init(struct nvkm_therm *);
 void gk104_clkgate_enable(struct nvkm_therm *);
 void gk104_clkgate_fini(struct nvkm_therm *, bool);