drm/nouveau/flcn: rework falcon reset

Mostly preparation to fit in Ampere changes, but should result in reset
sequences a lot closer to RM's, and perhaps help out with the issues we
sometimes see reported in this area.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

6 files changed, 130 insertions, 76 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/Kbuild b/drivers/gpu/drm/nouveau/nvkm/falcon/Kbuild
index d79d783904ee..f2ffca4afbe3 100644
--- a/drivers/gpu/drm/nouveau/nvkm/falcon/Kbuild
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/Kbuild
@@ -4,3 +4,6 @@ nvkm-y += nvkm/falcon/cmdq.o
 nvkm-y += nvkm/falcon/msgq.o
 nvkm-y += nvkm/falcon/qmgr.o
 nvkm-y += nvkm/falcon/v1.o
+
+nvkm-y += nvkm/falcon/gm200.o
+nvkm-y += nvkm/falcon/gp102.o
diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/base.c b/drivers/gpu/drm/nouveau/nvkm/falcon/base.c
index 5a5b96dad640..ed88cfb17f12 100644
--- a/drivers/gpu/drm/nouveau/nvkm/falcon/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/base.c
@@ -85,44 +85,15 @@ nvkm_falcon_start(struct nvkm_falcon *falcon)
 }
 
 int
-nvkm_falcon_enable(struct nvkm_falcon *falcon)
+nvkm_falcon_reset(struct nvkm_falcon *falcon)
 {
-	struct nvkm_device *device = falcon->owner->device;
 	int ret;
 
-	nvkm_mc_enable(device, falcon->owner->type, falcon->owner->inst);
-	ret = falcon->func->enable(falcon);
-	if (ret) {
-		nvkm_mc_disable(device, falcon->owner->type, falcon->owner->inst);
+	ret = falcon->func->disable(falcon);
+	if (WARN_ON(ret))
 		return ret;
-	}
-
-	return 0;
-}
-
-void
-nvkm_falcon_disable(struct nvkm_falcon *falcon)
-{
-	struct nvkm_device *device = falcon->owner->device;
-
-	/* already disabled, return or wait_idle will timeout */
-	if (!nvkm_mc_enabled(device, falcon->owner->type, falcon->owner->inst))
-		return;
-
-	falcon->func->disable(falcon);
-
-	nvkm_mc_disable(device, falcon->owner->type, falcon->owner->inst);
-}
-
-int
-nvkm_falcon_reset(struct nvkm_falcon *falcon)
-{
-	if (!falcon->func->reset) {
-		nvkm_falcon_disable(falcon);
-		return nvkm_falcon_enable(falcon);
-	}
 
-	return falcon->func->reset(falcon);
+	return nvkm_falcon_enable(falcon);
 }
 
 int
diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c b/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
new file mode 100644
index 000000000000..9144bcbc7f45
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2022 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.
+ */
+#include "priv.h"
+
+#include <subdev/mc.h>
+#include <subdev/timer.h>
+
+int
+gm200_flcn_reset_wait_mem_scrubbing(struct nvkm_falcon *falcon)
+{
+	nvkm_falcon_mask(falcon, 0x040, 0x00000000, 0x00000000);
+
+	if (nvkm_msec(falcon->owner->device, 10,
+		if (!(nvkm_falcon_rd32(falcon, 0x10c) & 0x00000006))
+			break;
+	) < 0)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+int
+gm200_flcn_enable(struct nvkm_falcon *falcon)
+{
+	struct nvkm_device *device = falcon->owner->device;
+	int ret;
+
+	if (falcon->func->reset_eng) {
+		ret = falcon->func->reset_eng(falcon);
+		if (ret)
+			return ret;
+	}
+
+	if (falcon->func->reset_pmc)
+		nvkm_mc_enable(device, falcon->owner->type, falcon->owner->inst);
+
+	ret = falcon->func->reset_wait_mem_scrubbing(falcon);
+	if (ret)
+		return ret;
+
+	nvkm_falcon_wr32(falcon, 0x084, nvkm_rd32(device, 0x000000));
+	return 0;
+}
+
+int
+gm200_flcn_disable(struct nvkm_falcon *falcon)
+{
+	struct nvkm_device *device = falcon->owner->device;
+	int ret;
+
+	nvkm_falcon_mask(falcon, 0x048, 0x00000003, 0x00000000);
+	nvkm_falcon_wr32(falcon, 0x014, 0xffffffff);
+
+	if (falcon->func->reset_pmc)
+		nvkm_mc_disable(device, falcon->owner->type, falcon->owner->inst);
+
+	if (falcon->func->reset_eng) {
+		ret = falcon->func->reset_eng(falcon);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/gp102.c b/drivers/gpu/drm/nouveau/nvkm/falcon/gp102.c
new file mode 100644
index 000000000000..f49918530d0b
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/gp102.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2022 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.
+ */
+#include "priv.h"
+
+int
+gp102_flcn_reset_eng(struct nvkm_falcon *falcon)
+{
+	nvkm_falcon_mask(falcon, 0x3c0, 0x00000001, 0x00000001);
+	udelay(10);
+	nvkm_falcon_mask(falcon, 0x3c0, 0x00000001, 0x00000000);
+
+	return falcon->func->reset_wait_mem_scrubbing(falcon);
+}
diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/priv.h b/drivers/gpu/drm/nouveau/nvkm/falcon/priv.h
index 466188752eb0..11a24b9c8569 100644
--- a/drivers/gpu/drm/nouveau/nvkm/falcon/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/priv.h
@@ -2,4 +2,12 @@
 #ifndef __NVKM_FALCON_PRIV_H__
 #define __NVKM_FALCON_PRIV_H__
 #include <core/falcon.h>
+
+static inline int
+nvkm_falcon_enable(struct nvkm_falcon *falcon)
+{
+	if (falcon->func->enable)
+		return falcon->func->enable(falcon);
+	return 0;
+}
 #endif
diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/v1.c b/drivers/gpu/drm/nouveau/nvkm/falcon/v1.c
index b0ee4c31414c..9a9e1e6f70a6 100644
--- a/drivers/gpu/drm/nouveau/nvkm/falcon/v1.c
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/v1.c
@@ -266,46 +266,3 @@ nvkm_falcon_v1_clear_interrupt(struct nvkm_falcon *falcon, u32 mask)
 
 	return 0;
 }
-
-static int
-falcon_v1_wait_idle(struct nvkm_falcon *falcon)
-{
-	struct nvkm_device *device = falcon->owner->device;
-	int ret;
-
-	ret = nvkm_wait_msec(device, 10, falcon->addr + 0x04c, 0xffff, 0x0);
-	if (ret < 0)
-		return ret;
-
-	return 0;
-}
-
-int
-nvkm_falcon_v1_enable(struct nvkm_falcon *falcon)
-{
-	struct nvkm_device *device = falcon->owner->device;
-	int ret;
-
-	ret = nvkm_wait_msec(device, 10, falcon->addr + 0x10c, 0x6, 0x0);
-	if (ret < 0) {
-		nvkm_error(falcon->user, "Falcon mem scrubbing timeout\n");
-		return ret;
-	}
-
-	ret = falcon_v1_wait_idle(falcon);
-	if (ret)
-		return ret;
-
-	/* enable IRQs */
-	nvkm_falcon_wr32(falcon, 0x010, 0xff);
-
-	return 0;
-}
-
-void
-nvkm_falcon_v1_disable(struct nvkm_falcon *falcon)
-{
-	/* disable IRQs and wait for any previous code to complete */
-	nvkm_falcon_wr32(falcon, 0x014, 0xff);
-	falcon_v1_wait_idle(falcon);
-}