drm/nouveau/disp: port vblank handling to event interface

This removes the nastiness with the interactions between display and
software engines when handling vblank semaphore release interrupts.

Now, all the semantics are handled in one place (sw) \o/.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

19 files changed, 226 insertions, 216 deletions

diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index 6d4cb8a..ebe37fe 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -143,6 +143,7 @@ nouveau-y += core/engine/copy/nvc0.o
 nouveau-y += core/engine/copy/nve0.o
 nouveau-y += core/engine/crypt/nv84.o
 nouveau-y += core/engine/crypt/nv98.o
+nouveau-y += core/engine/disp/base.o
 nouveau-y += core/engine/disp/nv04.o
 nouveau-y += core/engine/disp/nv50.o
 nouveau-y += core/engine/disp/nv84.o
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/base.c b/drivers/gpu/drm/nouveau/core/engine/disp/base.c
new file mode 100644
index 0000000..7a5cae4
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/base.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2013 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: Ben Skeggs
+ */
+
+#include <engine/disp.h>
+
+void
+_nouveau_disp_dtor(struct nouveau_object *object)
+{
+	struct nouveau_disp *disp = (void *)object;
+	nouveau_event_destroy(&disp->vblank);
+	nouveau_engine_destroy(&disp->base);
+}
+
+int
+nouveau_disp_create_(struct nouveau_object *parent,
+		     struct nouveau_object *engine,
+		     struct nouveau_oclass *oclass, int heads,
+		     const char *intname, const char *extname,
+		     int length, void **pobject)
+{
+	struct nouveau_disp *disp;
+	int ret;
+
+	ret = nouveau_engine_create_(parent, engine, oclass, true,
+				     intname, extname, length, pobject);
+	disp = *pobject;
+	if (ret)
+		return ret;
+
+	return nouveau_event_create(heads, &disp->vblank);
+}
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c b/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c
index 6eaf725..05e903f 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c
@@ -23,6 +23,8 @@
  */
 
 #include <engine/disp.h>
+
+#include <core/event.h>
 #include <core/class.h>
 
 struct nv04_disp_priv {
@@ -35,12 +37,20 @@ nv04_disp_sclass[] = {
 	{},
 };
 
+/*******************************************************************************
+ * Display engine implementation
+ ******************************************************************************/
+
+static void
+nv04_disp_vblank_enable(struct nouveau_event *event, int head)
+{
+	nv_wr32(event->priv, 0x600140 + (head * 0x2000) , 0x00000001);
+}
+
 static void
-nv04_disp_intr_vblank(struct nv04_disp_priv *priv, int crtc)
+nv04_disp_vblank_disable(struct nouveau_event *event, int head)
 {
-	struct nouveau_disp *disp = &priv->base;
-	if (disp->vblank.notify)
-		disp->vblank.notify(disp->vblank.data, crtc);
+	nv_wr32(event->priv, 0x600140 + (head * 0x2000) , 0x00000000);
 }
 
 static void
@@ -51,25 +61,25 @@ nv04_disp_intr(struct nouveau_subdev *subdev)
 	u32 crtc1 = nv_rd32(priv, 0x602100);
 
 	if (crtc0 & 0x00000001) {
-		nv04_disp_intr_vblank(priv, 0);
+		nouveau_event_trigger(priv->base.vblank, 0);
 		nv_wr32(priv, 0x600100, 0x00000001);
 	}
 
 	if (crtc1 & 0x00000001) {
-		nv04_disp_intr_vblank(priv, 1);
+		nouveau_event_trigger(priv->base.vblank, 1);
 		nv_wr32(priv, 0x602100, 0x00000001);
 	}
 }
 
 static int
 nv04_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
-		  struct nouveau_oclass *oclass, void *data, u32 size,
-		  struct nouveau_object **pobject)
+	       struct nouveau_oclass *oclass, void *data, u32 size,
+	       struct nouveau_object **pobject)
 {
 	struct nv04_disp_priv *priv;
 	int ret;
 
-	ret = nouveau_disp_create(parent, engine, oclass, "DISPLAY",
+	ret = nouveau_disp_create(parent, engine, oclass, 2, "DISPLAY",
 				  "display", &priv);
 	*pobject = nv_object(priv);
 	if (ret)
@@ -77,6 +87,9 @@ nv04_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 
 	nv_engine(priv)->sclass = nv04_disp_sclass;
 	nv_subdev(priv)->intr = nv04_disp_intr;
+	priv->base.vblank->priv = priv;
+	priv->base.vblank->enable = nv04_disp_vblank_enable;
+	priv->base.vblank->disable = nv04_disp_vblank_disable;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c b/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
index ca1a7d7..0d26f00 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
@@ -27,7 +27,6 @@
 #include <core/handle.h>
 #include <core/class.h>
 
-#include <engine/software.h>
 #include <engine/disp.h>
 
 #include <subdev/bios.h>
@@ -37,7 +36,6 @@
 #include <subdev/bios/pll.h>
 #include <subdev/timer.h>
 #include <subdev/fb.h>
-#include <subdev/bar.h>
 #include <subdev/clock.h>
 
 #include "nv50.h"
@@ -543,6 +541,18 @@ nv50_disp_curs_ofuncs = {
  * Base display object
  ******************************************************************************/
 
+static void
+nv50_disp_base_vblank_enable(struct nouveau_event *event, int head)
+{
+	nv_mask(event->priv, 0x61002c, (1 << head), (1 << head));
+}
+
+static void
+nv50_disp_base_vblank_disable(struct nouveau_event *event, int head)
+{
+	nv_mask(event->priv, 0x61002c, (1 << head), (0 << head));
+}
+
 static int
 nv50_disp_base_ctor(struct nouveau_object *parent,
 		    struct nouveau_object *engine,
@@ -559,6 +569,9 @@ nv50_disp_base_ctor(struct nouveau_object *parent,
 	if (ret)
 		return ret;
 
+	priv->base.vblank->priv = priv;
+	priv->base.vblank->enable = nv50_disp_base_vblank_enable;
+	priv->base.vblank->disable = nv50_disp_base_vblank_disable;
 	return nouveau_ramht_new(parent, parent, 0x1000, 0, &base->ramht);
 }
 
@@ -756,50 +769,6 @@ nv50_disp_intr_error(struct nv50_disp_priv *priv)
 	}
 }
 
-static void
-nv50_disp_intr_vblank(struct nv50_disp_priv *priv, int crtc)
-{
-	struct nouveau_bar *bar = nouveau_bar(priv);
-	struct nouveau_disp *disp = &priv->base;
-	struct nouveau_software_chan *chan, *temp;
-	unsigned long flags;
-
-	spin_lock_irqsave(&disp->vblank.lock, flags);
-	list_for_each_entry_safe(chan, temp, &disp->vblank.list, vblank.head) {
-		if (chan->vblank.crtc != crtc)
-			continue;
-
-		if (nv_device(priv)->chipset >= 0xc0) {
-			nv_wr32(priv, 0x001718, 0x80000000 | chan->vblank.channel);
-			bar->flush(bar);
-			nv_wr32(priv, 0x06000c,
-				upper_32_bits(chan->vblank.offset));
-			nv_wr32(priv, 0x060010,
-				lower_32_bits(chan->vblank.offset));
-			nv_wr32(priv, 0x060014, chan->vblank.value);
-		} else {
-			nv_wr32(priv, 0x001704, chan->vblank.channel);
-			nv_wr32(priv, 0x001710, 0x80000000 | chan->vblank.ctxdma);
-			bar->flush(bar);
-			if (nv_device(priv)->chipset == 0x50) {
-				nv_wr32(priv, 0x001570, chan->vblank.offset);
-				nv_wr32(priv, 0x001574, chan->vblank.value);
-			} else {
-				nv_wr32(priv, 0x060010, chan->vblank.offset);
-				nv_wr32(priv, 0x060014, chan->vblank.value);
-			}
-		}
-
-		list_del(&chan->vblank.head);
-		if (disp->vblank.put)
-			disp->vblank.put(disp->vblank.data, crtc);
-	}
-	spin_unlock_irqrestore(&disp->vblank.lock, flags);
-
-	if (disp->vblank.notify)
-		disp->vblank.notify(disp->vblank.data, crtc);
-}
-
 static u16
 exec_lookup(struct nv50_disp_priv *priv, int head, int outp, u32 ctrl,
 	    struct dcb_output *dcb, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
@@ -1201,13 +1170,13 @@ nv50_disp_intr(struct nouveau_subdev *subdev)
 	}
 
 	if (intr1 & 0x00000004) {
-		nv50_disp_intr_vblank(priv, 0);
+		nouveau_event_trigger(priv->base.vblank, 0);
 		nv_wr32(priv, 0x610024, 0x00000004);
 		intr1 &= ~0x00000004;
 	}
 
 	if (intr1 & 0x00000008) {
-		nv50_disp_intr_vblank(priv, 1);
+		nouveau_event_trigger(priv->base.vblank, 1);
 		nv_wr32(priv, 0x610024, 0x00000008);
 		intr1 &= ~0x00000008;
 	}
@@ -1226,7 +1195,7 @@ nv50_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nv50_disp_priv *priv;
 	int ret;
 
-	ret = nouveau_disp_create(parent, engine, oclass, "PDISP",
+	ret = nouveau_disp_create(parent, engine, oclass, 2, "PDISP",
 				  "display", &priv);
 	*pobject = nv_object(priv);
 	if (ret)
@@ -1242,9 +1211,6 @@ nv50_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	priv->dac.power = nv50_dac_power;
 	priv->dac.sense = nv50_dac_sense;
 	priv->sor.power = nv50_sor_power;
-
-	INIT_LIST_HEAD(&priv->base.vblank.list);
-	spin_lock_init(&priv->base.vblank.lock);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nv50.h b/drivers/gpu/drm/nouveau/core/engine/disp/nv50.h
index a6bb9314..fc89718 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nv50.h
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nv50.h
@@ -3,7 +3,9 @@
 
 #include <core/parent.h>
 #include <core/namedb.h>
+#include <core/engctx.h>
 #include <core/ramht.h>
+#include <core/event.h>
 
 #include <engine/dmaobj.h>
 #include <engine/disp.h>
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nv84.c b/drivers/gpu/drm/nouveau/core/engine/disp/nv84.c
index fc84eac..a215342 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nv84.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nv84.c
@@ -63,7 +63,7 @@ nv84_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nv50_disp_priv *priv;
 	int ret;
 
-	ret = nouveau_disp_create(parent, engine, oclass, "PDISP",
+	ret = nouveau_disp_create(parent, engine, oclass, 2, "PDISP",
 				  "display", &priv);
 	*pobject = nv_object(priv);
 	if (ret)
@@ -80,9 +80,6 @@ nv84_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	priv->dac.sense = nv50_dac_sense;
 	priv->sor.power = nv50_sor_power;
 	priv->sor.hdmi = nv84_hdmi_ctrl;
-
-	INIT_LIST_HEAD(&priv->base.vblank.list);
-	spin_lock_init(&priv->base.vblank.lock);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nv94.c b/drivers/gpu/drm/nouveau/core/engine/disp/nv94.c
index ba9dfd4..a315e28 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nv94.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nv94.c
@@ -69,7 +69,7 @@ nv94_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nv50_disp_priv *priv;
 	int ret;
 
-	ret = nouveau_disp_create(parent, engine, oclass, "PDISP",
+	ret = nouveau_disp_create(parent, engine, oclass, 2, "PDISP",
 				  "display", &priv);
 	*pobject = nv_object(priv);
 	if (ret)
@@ -91,9 +91,6 @@ nv94_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	priv->sor.dp_train_fini = nv94_sor_dp_train_fini;
 	priv->sor.dp_lnkctl = nv94_sor_dp_lnkctl;
 	priv->sor.dp_drvctl = nv94_sor_dp_drvctl;
-
-	INIT_LIST_HEAD(&priv->base.vblank.list);
-	spin_lock_init(&priv->base.vblank.lock);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nva0.c b/drivers/gpu/drm/nouveau/core/engine/disp/nva0.c
index 5d63902..480e2de 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nva0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nva0.c
@@ -53,7 +53,7 @@ nva0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nv50_disp_priv *priv;
 	int ret;
 
-	ret = nouveau_disp_create(parent, engine, oclass, "PDISP",
+	ret = nouveau_disp_create(parent, engine, oclass, 2, "PDISP",
 				  "display", &priv);
 	*pobject = nv_object(priv);
 	if (ret)
@@ -70,9 +70,6 @@ nva0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	priv->dac.sense = nv50_dac_sense;
 	priv->sor.power = nv50_sor_power;
 	priv->sor.hdmi = nv84_hdmi_ctrl;
-
-	INIT_LIST_HEAD(&priv->base.vblank.list);
-	spin_lock_init(&priv->base.vblank.lock);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nva3.c b/drivers/gpu/drm/nouveau/core/engine/disp/nva3.c
index e9192ca..718b4f6 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nva3.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nva3.c
@@ -70,7 +70,7 @@ nva3_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nv50_disp_priv *priv;
 	int ret;
 
-	ret = nouveau_disp_create(parent, engine, oclass, "PDISP",
+	ret = nouveau_disp_create(parent, engine, oclass, 2, "PDISP",
 				  "display", &priv);
 	*pobject = nv_object(priv);
 	if (ret)
@@ -93,9 +93,6 @@ nva3_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	priv->sor.dp_train_fini = nv94_sor_dp_train_fini;
 	priv->sor.dp_lnkctl = nv94_sor_dp_lnkctl;
 	priv->sor.dp_drvctl = nv94_sor_dp_drvctl;
-
-	INIT_LIST_HEAD(&priv->base.vblank.list);
-	spin_lock_init(&priv->base.vblank.lock);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
index 9e38ebf..74626e8 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
@@ -27,12 +27,10 @@
 #include <core/handle.h>
 #include <core/class.h>
 
-#include <engine/software.h>
 #include <engine/disp.h>
 
 #include <subdev/timer.h>
 #include <subdev/fb.h>
-#include <subdev/bar.h>
 #include <subdev/clock.h>
 
 #include <subdev/bios.h>
@@ -443,6 +441,18 @@ nvd0_disp_curs_ofuncs = {
  * Base display object
  ******************************************************************************/
 
+static void
+nvd0_disp_base_vblank_enable(struct nouveau_event *event, int head)
+{
+	nv_mask(event->priv, 0x6100c0 + (head * 0x800), 0x00000001, 0x00000001);
+}
+
+static void
+nvd0_disp_base_vblank_disable(struct nouveau_event *event, int head)
+{
+	nv_mask(event->priv, 0x6100c0 + (head * 0x800), 0x00000001, 0x00000000);
+}
+
 static int
 nvd0_disp_base_ctor(struct nouveau_object *parent,
 		    struct nouveau_object *engine,
@@ -459,6 +469,10 @@ nvd0_disp_base_ctor(struct nouveau_object *parent,
 	if (ret)
 		return ret;
 
+	priv->base.vblank->priv = priv;
+	priv->base.vblank->enable = nvd0_disp_base_vblank_enable;
+	priv->base.vblank->disable = nvd0_disp_base_vblank_disable;
+
 	return nouveau_ramht_new(parent, parent, 0x1000, 0, &base->ramht);
 }
 
@@ -822,35 +836,6 @@ nvd0_display_unk4_handler(struct nv50_disp_priv *priv, u32 head, u32 mask)
 	nv_wr32(priv, 0x6101d0, 0x80000000);
 }
 
-static void
-nvd0_disp_intr_vblank(struct nv50_disp_priv *priv, int crtc)
-{
-	struct nouveau_bar *bar = nouveau_bar(priv);
-	struct nouveau_disp *disp = &priv->base;
-	struct nouveau_software_chan *chan, *temp;
-	unsigned long flags;
-
-	spin_lock_irqsave(&disp->vblank.lock, flags);
-	list_for_each_entry_safe(chan, temp, &disp->vblank.list, vblank.head) {
-		if (chan->vblank.crtc != crtc)
-			continue;
-
-		nv_wr32(priv, 0x001718, 0x80000000 | chan->vblank.channel);
-		bar->flush(bar);
-		nv_wr32(priv, 0x06000c, upper_32_bits(chan->vblank.offset));
-		nv_wr32(priv, 0x060010, lower_32_bits(chan->vblank.offset));
-		nv_wr32(priv, 0x060014, chan->vblank.value);
-
-		list_del(&chan->vblank.head);
-		if (disp->vblank.put)
-			disp->vblank.put(disp->vblank.data, crtc);
-	}
-	spin_unlock_irqrestore(&disp->vblank.lock, flags);
-
-	if (disp->vblank.notify)
-		disp->vblank.notify(disp->vblank.data, crtc);
-}
-
 void
 nvd0_disp_intr(struct nouveau_subdev *subdev)
 {
@@ -920,7 +905,7 @@ nvd0_disp_intr(struct nouveau_subdev *subdev)
 		if (mask & intr) {
 			u32 stat = nv_rd32(priv, 0x6100bc + (i * 0x800));
 			if (stat & 0x00000001)
-				nvd0_disp_intr_vblank(priv, i);
+				nouveau_event_trigger(priv->base.vblank, i);
 			nv_mask(priv, 0x6100bc + (i * 0x800), 0, 0);
 			nv_rd32(priv, 0x6100c0 + (i * 0x800));
 		}
@@ -933,10 +918,11 @@ nvd0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	       struct nouveau_object **pobject)
 {
 	struct nv50_disp_priv *priv;
+	int heads = nv_rd32(parent, 0x022448);
 	int ret;
 
-	ret = nouveau_disp_create(parent, engine, oclass, "PDISP",
-				  "display", &priv);
+	ret = nouveau_disp_create(parent, engine, oclass, heads,
+				  "PDISP", "display", &priv);
 	*pobject = nv_object(priv);
 	if (ret)
 		return ret;
@@ -945,7 +931,7 @@ nvd0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	nv_engine(priv)->cclass = &nv50_disp_cclass;
 	nv_subdev(priv)->intr = nvd0_disp_intr;
 	priv->sclass = nvd0_disp_sclass;
-	priv->head.nr = nv_rd32(priv, 0x022448);
+	priv->head.nr = heads;
 	priv->dac.nr = 3;
 	priv->sor.nr = 4;
 	priv->dac.power = nv50_dac_power;
@@ -958,9 +944,6 @@ nvd0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	priv->sor.dp_train_fini = nv94_sor_dp_train_fini;
 	priv->sor.dp_lnkctl = nvd0_sor_dp_lnkctl;
 	priv->sor.dp_drvctl = nvd0_sor_dp_drvctl;
-
-	INIT_LIST_HEAD(&priv->base.vblank.list);
-	spin_lock_init(&priv->base.vblank.lock);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nve0.c b/drivers/gpu/drm/nouveau/core/engine/disp/nve0.c
index 259537c..5512296 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nve0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nve0.c
@@ -51,10 +51,11 @@ nve0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	       struct nouveau_object **pobject)
 {
 	struct nv50_disp_priv *priv;
+	int heads = nv_rd32(parent, 0x022448);
 	int ret;
 
-	ret = nouveau_disp_create(parent, engine, oclass, "PDISP",
-				  "display", &priv);
+	ret = nouveau_disp_create(parent, engine, oclass, heads,
+				  "PDISP", "display", &priv);
 	*pobject = nv_object(priv);
 	if (ret)
 		return ret;
@@ -63,7 +64,7 @@ nve0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	nv_engine(priv)->cclass = &nv50_disp_cclass;
 	nv_subdev(priv)->intr = nvd0_disp_intr;
 	priv->sclass = nve0_disp_sclass;
-	priv->head.nr = nv_rd32(priv, 0x022448);
+	priv->head.nr = heads;
 	priv->dac.nr = 3;
 	priv->sor.nr = 4;
 	priv->dac.power = nv50_dac_power;
@@ -76,9 +77,6 @@ nve0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	priv->sor.dp_train_fini = nv94_sor_dp_train_fini;
 	priv->sor.dp_lnkctl = nvd0_sor_dp_lnkctl;
 	priv->sor.dp_drvctl = nvd0_sor_dp_drvctl;
-
-	INIT_LIST_HEAD(&priv->base.vblank.list);
-	spin_lock_init(&priv->base.vblank.lock);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/engine/software/nv50.c b/drivers/gpu/drm/nouveau/core/engine/software/nv50.c
index b0e7e1c..c48e749 100644
--- a/drivers/gpu/drm/nouveau/core/engine/software/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/engine/software/nv50.c
@@ -28,6 +28,9 @@
 #include <core/namedb.h>
 #include <core/handle.h>
 #include <core/gpuobj.h>
+#include <core/event.h>
+
+#include <subdev/bar.h>
 
 #include <engine/software.h>
 #include <engine/disp.h>
@@ -90,18 +93,11 @@ nv50_software_mthd_vblsem_release(struct nouveau_object *object, u32 mthd,
 {
 	struct nv50_software_chan *chan = (void *)nv_engctx(object->parent);
 	struct nouveau_disp *disp = nouveau_disp(object);
-	unsigned long flags;
 	u32 crtc = *(u32 *)args;
-
 	if (crtc > 1)
 		return -EINVAL;
 
-	disp->vblank.get(disp->vblank.data, crtc);
-
-	spin_lock_irqsave(&disp->vblank.lock, flags);
-	list_add(&chan->base.vblank.head, &disp->vblank.list);
-	chan->base.vblank.crtc = crtc;
-	spin_unlock_irqrestore(&disp->vblank.lock, flags);
+	nouveau_event_get(disp->vblank, crtc, &chan->base.vblank.event);
 	return 0;
 }
 
@@ -136,6 +132,29 @@ nv50_software_sclass[] = {
  ******************************************************************************/
 
 static int
+nv50_software_vblsem_release(struct nouveau_eventh *event, int head)
+{
+	struct nouveau_software_chan *chan =
+		container_of(event, struct nouveau_software_chan, vblank.event);
+	struct nv50_software_priv *priv = (void *)nv_object(chan)->engine;
+	struct nouveau_bar *bar = nouveau_bar(priv);
+
+	nv_wr32(priv, 0x001704, chan->vblank.channel);
+	nv_wr32(priv, 0x001710, 0x80000000 | chan->vblank.ctxdma);
+	bar->flush(bar);
+
+	if (nv_device(priv)->chipset == 0x50) {
+		nv_wr32(priv, 0x001570, chan->vblank.offset);
+		nv_wr32(priv, 0x001574, chan->vblank.value);
+	} else {
+		nv_wr32(priv, 0x060010, chan->vblank.offset);
+		nv_wr32(priv, 0x060014, chan->vblank.value);
+	}
+
+	return NVKM_EVENT_DROP;
+}
+
+static int
 nv50_software_context_ctor(struct nouveau_object *parent,
 			   struct nouveau_object *engine,
 			   struct nouveau_oclass *oclass, void *data, u32 size,
@@ -150,6 +169,7 @@ nv50_software_context_ctor(struct nouveau_object *parent,
 		return ret;
 
 	chan->base.vblank.channel = nv_gpuobj(parent->parent)->addr >> 12;
+	chan->base.vblank.event.func = nv50_software_vblsem_release;
 	return 0;
 }
 
@@ -170,8 +190,8 @@ nv50_software_cclass = {
 
 static int
 nv50_software_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
-	      struct nouveau_oclass *oclass, void *data, u32 size,
-	      struct nouveau_object **pobject)
+		   struct nouveau_oclass *oclass, void *data, u32 size,
+		   struct nouveau_object **pobject)
 {
 	struct nv50_software_priv *priv;
 	int ret;
diff --git a/drivers/gpu/drm/nouveau/core/engine/software/nvc0.c b/drivers/gpu/drm/nouveau/core/engine/software/nvc0.c
index 282a1cd..a523eaa 100644
--- a/drivers/gpu/drm/nouveau/core/engine/software/nvc0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/software/nvc0.c
@@ -25,6 +25,9 @@
 #include <core/os.h>
 #include <core/class.h>
 #include <core/engctx.h>
+#include <core/event.h>
+
+#include <subdev/bar.h>
 
 #include <engine/software.h>
 #include <engine/disp.h>
@@ -72,18 +75,12 @@ nvc0_software_mthd_vblsem_release(struct nouveau_object *object, u32 mthd,
 {
 	struct nvc0_software_chan *chan = (void *)nv_engctx(object->parent);
 	struct nouveau_disp *disp = nouveau_disp(object);
-	unsigned long flags;
 	u32 crtc = *(u32 *)args;
 
 	if ((nv_device(object)->card_type < NV_E0 && crtc > 1) || crtc > 3)
 		return -EINVAL;
 
-	disp->vblank.get(disp->vblank.data, crtc);
-
-	spin_lock_irqsave(&disp->vblank.lock, flags);
-	list_add(&chan->base.vblank.head, &disp->vblank.list);
-	chan->base.vblank.crtc = crtc;
-	spin_unlock_irqrestore(&disp->vblank.lock, flags);
+	nouveau_event_get(disp->vblank, crtc, &chan->base.vblank.event);
 	return 0;
 }
 
@@ -118,6 +115,23 @@ nvc0_software_sclass[] = {
  ******************************************************************************/
 
 static int
+nvc0_software_vblsem_release(struct nouveau_eventh *event, int head)
+{
+	struct nouveau_software_chan *chan =
+		container_of(event, struct nouveau_software_chan, vblank.event);
+	struct nvc0_software_priv *priv = (void *)nv_object(chan)->engine;
+	struct nouveau_bar *bar = nouveau_bar(priv);
+
+	nv_wr32(priv, 0x001718, 0x80000000 | chan->vblank.channel);
+	bar->flush(bar);
+	nv_wr32(priv, 0x06000c, upper_32_bits(chan->vblank.offset));
+	nv_wr32(priv, 0x060010, lower_32_bits(chan->vblank.offset));
+	nv_wr32(priv, 0x060014, chan->vblank.value);
+
+	return NVKM_EVENT_DROP;
+}
+
+static int
 nvc0_software_context_ctor(struct nouveau_object *parent,
 			   struct nouveau_object *engine,
 			   struct nouveau_oclass *oclass, void *data, u32 size,
@@ -132,6 +146,7 @@ nvc0_software_context_ctor(struct nouveau_object *parent,
 		return ret;
 
 	chan->base.vblank.channel = nv_gpuobj(parent->parent)->addr >> 12;
+	chan->base.vblank.event.func = nvc0_software_vblsem_release;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/include/engine/disp.h b/drivers/gpu/drm/nouveau/core/include/engine/disp.h
index 4694828..28da677 100644
--- a/drivers/gpu/drm/nouveau/core/include/engine/disp.h
+++ b/drivers/gpu/drm/nouveau/core/include/engine/disp.h
@@ -4,18 +4,11 @@
 #include <core/object.h>
 #include <core/engine.h>
 #include <core/device.h>
+#include <core/event.h>
 
 struct nouveau_disp {
 	struct nouveau_engine base;
-
-	struct {
-		struct list_head list;
-		spinlock_t lock;
-		void (*notify)(void *, int);
-		void (*get)(void *, int);
-		void (*put)(void *, int);
-		void *data;
-	} vblank;
+	struct nouveau_event *vblank;
 };
 
 static inline struct nouveau_disp *
@@ -24,16 +17,22 @@ nouveau_disp(void *obj)
 	return (void *)nv_device(obj)->subdev[NVDEV_ENGINE_DISP];
 }
 
-#define nouveau_disp_create(p,e,c,i,x,d)                                       \
-	nouveau_engine_create((p), (e), (c), true, (i), (x), (d))
-#define nouveau_disp_destroy(d)                                                \
-	nouveau_engine_destroy(&(d)->base)
+#define nouveau_disp_create(p,e,c,h,i,x,d)                                     \
+	nouveau_disp_create_((p), (e), (c), (h), (i), (x),                     \
+			     sizeof(**d), (void **)d)
+#define nouveau_disp_destroy(d) ({                                             \
+	struct nouveau_disp *disp = (d);                                       \
+	_nouveau_disp_dtor(nv_object(disp));                                   \
+})
 #define nouveau_disp_init(d)                                                   \
 	nouveau_engine_init(&(d)->base)
 #define nouveau_disp_fini(d,s)                                                 \
 	nouveau_engine_fini(&(d)->base, (s))
 
-#define _nouveau_disp_dtor _nouveau_engine_dtor
+int  nouveau_disp_create_(struct nouveau_object *, struct nouveau_object *,
+			  struct nouveau_oclass *, int heads,
+			  const char *, const char *, int, void **);
+void _nouveau_disp_dtor(struct nouveau_object *);
 #define _nouveau_disp_init _nouveau_engine_init
 #define _nouveau_disp_fini _nouveau_engine_fini
 
diff --git a/drivers/gpu/drm/nouveau/core/include/engine/software.h b/drivers/gpu/drm/nouveau/core/include/engine/software.h
index c945691..4579948 100644
--- a/drivers/gpu/drm/nouveau/core/include/engine/software.h
+++ b/drivers/gpu/drm/nouveau/core/include/engine/software.h
@@ -3,17 +3,17 @@
 
 #include <core/engine.h>
 #include <core/engctx.h>
+#include <core/event.h>
 
 struct nouveau_software_chan {
 	struct nouveau_engctx base;
 
 	struct {
-		struct list_head head;
+		struct nouveau_eventh event;
 		u32 channel;
 		u32 ctxdma;
 		u64 offset;
 		u32 value;
-		u32 crtc;
 	} vblank;
 
 	int (*flip)(void *);
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index e2fdd75..9f84803 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -41,6 +41,8 @@
 #include <subdev/gpio.h>
 #include <engine/disp.h>
 
+#include <core/class.h>
+
 static void
 nouveau_user_framebuffer_destroy(struct drm_framebuffer *drm_fb)
 {
@@ -257,29 +259,10 @@ nouveau_display_fini(struct drm_device *dev)
 	disp->fini(dev);
 }
 
-static void
-nouveau_display_vblank_notify(void *data, int crtc)
-{
-	drm_handle_vblank(data, crtc);
-}
-
-static void
-nouveau_display_vblank_get(void *data, int crtc)
-{
-	drm_vblank_get(data, crtc);
-}
-
-static void
-nouveau_display_vblank_put(void *data, int crtc)
-{
-	drm_vblank_put(data, crtc);
-}
-
 int
 nouveau_display_create(struct drm_device *dev)
 {
 	struct nouveau_drm *drm = nouveau_drm(dev);
-	struct nouveau_disp *pdisp = nouveau_disp(drm->device);
 	struct nouveau_display *disp;
 	u32 pclass = dev->pdev->class >> 8;
 	int ret, gen;
@@ -288,11 +271,6 @@ nouveau_display_create(struct drm_device *dev)
 	if (!disp)
 		return -ENOMEM;
 
-	pdisp->vblank.data = dev;
-	pdisp->vblank.notify = nouveau_display_vblank_notify;
-	pdisp->vblank.get = nouveau_display_vblank_get;
-	pdisp->vblank.put = nouveau_display_vblank_put;
-
 	drm_mode_config_init(dev);
 	drm_mode_create_scaling_mode_property(dev);
 	drm_mode_create_dvi_i_properties(dev);
@@ -474,39 +452,6 @@ nouveau_display_resume(struct drm_device *dev)
 	}
 }
 
-int
-nouveau_vblank_enable(struct drm_device *dev, int crtc)
-{
-	struct nouveau_device *device = nouveau_dev(dev);
-
-	if (device->card_type >= NV_D0)
-		nv_mask(device, 0x6100c0 + (crtc * 0x800), 1, 1);
-	else
-	if (device->card_type >= NV_50)
-		nv_mask(device, NV50_PDISPLAY_INTR_EN_1, 0,
-			NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc));
-	else
-		NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0,
-			    NV_PCRTC_INTR_0_VBLANK);
-
-	return 0;
-}
-
-void
-nouveau_vblank_disable(struct drm_device *dev, int crtc)
-{
-	struct nouveau_device *device = nouveau_dev(dev);
-
-	if (device->card_type >= NV_D0)
-		nv_mask(device, 0x6100c0 + (crtc * 0x800), 1, 0);
-	else
-	if (device->card_type >= NV_50)
-		nv_mask(device, NV50_PDISPLAY_INTR_EN_1,
-			NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc), 0);
-	else
-		NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0, 0);
-}
-
 static int
 nouveau_page_flip_reserve(struct nouveau_bo *old_bo,
 			  struct nouveau_bo *new_bo)
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
index 722548b..1ea3e47 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.h
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h
@@ -59,9 +59,6 @@ void nouveau_display_fini(struct drm_device *dev);
 int  nouveau_display_suspend(struct drm_device *dev);
 void nouveau_display_resume(struct drm_device *dev);
 
-int  nouveau_vblank_enable(struct drm_device *dev, int crtc);
-void nouveau_vblank_disable(struct drm_device *dev, int crtc);
-
 int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 			    struct drm_pending_vblank_event *event);
 int  nouveau_finish_page_flip(struct nouveau_channel *,
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index ef1ad21..ce91c8d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -34,6 +34,8 @@
 #include <subdev/device.h>
 #include <subdev/vm.h>
 
+#include <engine/disp.h>
+
 #include "nouveau_drm.h"
 #include "nouveau_irq.h"
 #include "nouveau_dma.h"
@@ -68,6 +70,32 @@ module_param_named(modeset, nouveau_modeset, int, 0400);
 
 static struct drm_driver driver;
 
+static int
+nouveau_drm_vblank_enable(struct drm_device *dev, int head)
+{
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nouveau_disp *pdisp = nouveau_disp(drm->device);
+	nouveau_event_get(pdisp->vblank, head, &drm->vblank);
+	return 0;
+}
+
+static void
+nouveau_drm_vblank_disable(struct drm_device *dev, int head)
+{
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nouveau_disp *pdisp = nouveau_disp(drm->device);
+	nouveau_event_put(pdisp->vblank, head, &drm->vblank);
+}
+
+static int
+nouveau_drm_vblank_handler(struct nouveau_eventh *event, int head)
+{
+	struct nouveau_drm *drm =
+		container_of(event, struct nouveau_drm, vblank);
+	drm_handle_vblank(drm->dev, head);
+	return NVKM_EVENT_KEEP;
+}
+
 static u64
 nouveau_name(struct pci_dev *pdev)
 {
@@ -259,6 +287,7 @@ nouveau_drm_load(struct drm_device *dev, unsigned long flags)
 
 	dev->dev_private = drm;
 	drm->dev = dev;
+	drm->vblank.func = nouveau_drm_vblank_handler;
 
 	INIT_LIST_HEAD(&drm->clients);
 	spin_lock_init(&drm->tile.lock);
@@ -643,8 +672,8 @@ driver = {
 	.irq_handler = nouveau_irq_handler,
 
 	.get_vblank_counter = drm_vblank_count,
-	.enable_vblank = nouveau_vblank_enable,
-	.disable_vblank = nouveau_vblank_disable,
+	.enable_vblank = nouveau_drm_vblank_enable,
+	.disable_vblank = nouveau_drm_vblank_disable,
 
 	.ioctls = nouveau_ioctls,
 	.fops = &nouveau_driver_fops,
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.h b/drivers/gpu/drm/nouveau/nouveau_drm.h
index aa89eb9..b25df37 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.h
@@ -13,6 +13,7 @@
 #define DRIVER_PATCHLEVEL	0
 
 #include <core/client.h>
+#include <core/event.h>
 
 #include <subdev/vm.h>
 
@@ -112,6 +113,7 @@ struct nouveau_drm {
 	struct nvbios vbios;
 	struct nouveau_display *display;
 	struct backlight_device *backlight;
+	struct nouveau_eventh vblank;
 
 	/* power management */
 	struct nouveau_pm *pm;