drm: expose the full object/event interfaces to userspace

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

11 files changed, 650 insertions, 13 deletions

diff --git a/drm/Kbuild b/drm/Kbuild
index 1a44d952..f5d7f7ce 100644
--- a/drm/Kbuild
+++ b/drm/Kbuild
@@ -340,7 +340,7 @@ nouveau-y += nouveau_drm.o nouveau_chan.o nouveau_dma.o nouveau_fence.o
 nouveau-y += nouveau_vga.o nouveau_agp.o
 nouveau-y += nouveau_ttm.o nouveau_sgdma.o nouveau_bo.o nouveau_gem.o
 nouveau-y += nouveau_prime.o nouveau_abi16.o
-nouveau-y += nouveau_nvif.o
+nouveau-y += nouveau_nvif.o nouveau_usif.o
 nouveau-y += nv04_fence.o nv10_fence.o nv17_fence.o
 nouveau-y += nv50_fence.o nv84_fence.o nvc0_fence.o
 
diff --git a/drm/nouveau_drm.c b/drm/nouveau_drm.c
index 14fb8e86..606cc6b4 100644
--- a/drm/nouveau_drm.c
+++ b/drm/nouveau_drm.c
@@ -50,6 +50,7 @@
 #include "nouveau_fbcon.h"
 #include "nouveau_fence.h"
 #include "nouveau_debugfs.h"
+#include "nouveau_usif.h"
 
 MODULE_PARM_DESC(config, "option string to pass to driver core");
 static char *nouveau_config;
@@ -107,8 +108,10 @@ nouveau_cli_create(u64 name, const char *sname,
 		int ret = nvif_client_init(NULL, NULL, sname, name,
 					   nouveau_config, nouveau_debug,
 					  &cli->base);
-		if (ret == 0)
+		if (ret == 0) {
 			mutex_init(&cli->mutex);
+			usif_client_init(cli);
+		}
 		return ret;
 	}
 	return -ENOMEM;
@@ -119,6 +122,7 @@ nouveau_cli_destroy(struct nouveau_cli *cli)
 {
 	nouveau_vm_ref(NULL, &nvkm_client(&cli->base)->vm, NULL);
 	nvif_client_fini(&cli->base);
+	usif_client_fini(cli);
 }
 
 static void
@@ -810,24 +814,31 @@ nouveau_ioctls[] = {
 	DRM_IOCTL_DEF_DRV(NOUVEAU_GEM_INFO, nouveau_gem_ioctl_info, DRM_UNLOCKED|DRM_AUTH|DRM_RENDER_ALLOW),
 };
 
-long nouveau_drm_ioctl(struct file *filp,
-		       unsigned int cmd, unsigned long arg)
+long
+nouveau_drm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-	struct drm_file *file_priv = filp->private_data;
-	struct drm_device *dev;
+	struct drm_file *filp = file->private_data;
+	struct drm_device *dev = filp->minor->dev;
 	long ret;
-	dev = file_priv->minor->dev;
 
 	ret = pm_runtime_get_sync(dev->dev);
 	if (ret < 0 && ret != -EACCES)
 		return ret;
 
-	ret = drm_ioctl(filp, cmd, arg);
+	switch (_IOC_NR(cmd) - DRM_COMMAND_BASE) {
+	case DRM_NOUVEAU_NVIF:
+		ret = usif_ioctl(filp, (void __user *)arg, _IOC_SIZE(cmd));
+		break;
+	default:
+		ret = drm_ioctl(file, cmd, arg);
+		break;
+	}
 
 	pm_runtime_mark_last_busy(dev->dev);
 	pm_runtime_put_autosuspend(dev->dev);
 	return ret;
 }
+
 static const struct file_operations
 nouveau_driver_fops = {
 	.owner = THIS_MODULE,
diff --git a/drm/nouveau_drm.h b/drm/nouveau_drm.h
index 3a6ef501..b02b0245 100644
--- a/drm/nouveau_drm.h
+++ b/drm/nouveau_drm.h
@@ -9,8 +9,8 @@
 #define DRIVER_DATE		"20120801"
 
 #define DRIVER_MAJOR		1
-#define DRIVER_MINOR		1
-#define DRIVER_PATCHLEVEL	2
+#define DRIVER_MINOR		2
+#define DRIVER_PATCHLEVEL	0
 
 /*
  * 1.1.1:
@@ -23,6 +23,9 @@
  *        bounds access to local memory to be silently ignored / return 0).
  * 1.1.2:
  *      - fixes multiple bugs in flip completion events and timestamping
+ * 1.2.0:
+ * 	- object api exposed to userspace
+ * 	- fermi,kepler,maxwell zbc
  */
 
 #include <nvif/client.h>
@@ -79,6 +82,8 @@ struct nouveau_cli {
 	struct list_head head;
 	struct mutex mutex;
 	void *abi16;
+	struct list_head objects;
+	struct list_head notifys;
 };
 
 static inline struct nouveau_cli *
diff --git a/drm/nouveau_nvif.c b/drm/nouveau_nvif.c
index c3838bff..47ca8862 100644
--- a/drm/nouveau_nvif.c
+++ b/drm/nouveau_nvif.c
@@ -37,6 +37,7 @@
 #include <nvif/ioctl.h>
 
 #include "nouveau_drm.h"
+#include "nouveau_usif.h"
 
 static void
 nvkm_client_unmap(void *priv, void *ptr, u32 size)
@@ -95,6 +96,8 @@ nvkm_client_ntfy(const void *header, u32 length, const void *data, u32 size)
 	switch (route) {
 	case NVDRM_NOTIFY_NVIF:
 		return nvif_notify(header, length, data, size);
+	case NVDRM_NOTIFY_USIF:
+		return usif_notify(header, length, data, size);
 	default:
 		WARN_ON(1);
 		break;
diff --git a/drm/nouveau_usif.c b/drm/nouveau_usif.c
new file mode 100644
index 00000000..cb1182d7
--- /dev/null
+++ b/drm/nouveau_usif.c
@@ -0,0 +1,384 @@
+/*
+ * Copyright 2014 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 <bskeggs@redhat.com>
+ */
+
+#include "nouveau_drm.h"
+#include "nouveau_usif.h"
+
+#include <nvif/notify.h>
+#include <nvif/unpack.h>
+#include <nvif/client.h>
+#include <nvif/event.h>
+#include <nvif/ioctl.h>
+
+struct usif_notify_p {
+	struct drm_pending_event base;
+	struct {
+		struct drm_event base;
+		u8 data[];
+	} e;
+};
+
+struct usif_notify {
+	struct list_head head;
+	atomic_t enabled;
+	u32 handle;
+	u16 reply;
+	u8  route;
+	u64 token;
+	struct usif_notify_p *p;
+};
+
+static inline struct usif_notify *
+usif_notify_find(struct drm_file *filp, u32 handle)
+{
+	struct nouveau_cli *cli = nouveau_cli(filp);
+	struct usif_notify *ntfy;
+	list_for_each_entry(ntfy, &cli->notifys, head) {
+		if (ntfy->handle == handle)
+			return ntfy;
+	}
+	return NULL;
+}
+
+static inline void
+usif_notify_dtor(struct usif_notify *ntfy)
+{
+	list_del(&ntfy->head);
+	kfree(ntfy);
+}
+
+int
+usif_notify(const void *header, u32 length, const void *data, u32 size)
+{
+	struct usif_notify *ntfy = NULL;
+	const union {
+		struct nvif_notify_rep_v0 v0;
+	} *rep = header;
+	struct drm_device *dev;
+	struct drm_file *filp;
+	unsigned long flags;
+
+	if (length == sizeof(rep->v0) && rep->v0.version == 0) {
+		if (WARN_ON(!(ntfy = (void *)(unsigned long)rep->v0.token)))
+			return NVIF_NOTIFY_DROP;
+		BUG_ON(rep->v0.route != NVDRM_NOTIFY_USIF);
+	} else
+	if (WARN_ON(1))
+		return NVIF_NOTIFY_DROP;
+
+	if (WARN_ON(!ntfy->p || ntfy->reply != (length + size)))
+		return NVIF_NOTIFY_DROP;
+	filp = ntfy->p->base.file_priv;
+	dev = filp->minor->dev;
+
+	memcpy(&ntfy->p->e.data[0], header, length);
+	memcpy(&ntfy->p->e.data[length], data, size);
+	switch (rep->v0.version) {
+	case 0: {
+		struct nvif_notify_rep_v0 *rep = (void *)ntfy->p->e.data;
+		rep->route = ntfy->route;
+		rep->token = ntfy->token;
+	}
+		break;
+	default:
+		BUG_ON(1);
+		break;
+	}
+
+	spin_lock_irqsave(&dev->event_lock, flags);
+	if (!WARN_ON(filp->event_space < ntfy->p->e.base.length)) {
+		list_add_tail(&ntfy->p->base.link, &filp->event_list);
+		filp->event_space -= ntfy->p->e.base.length;
+	}
+	wake_up_interruptible(&filp->event_wait);
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+	atomic_set(&ntfy->enabled, 0);
+	return NVIF_NOTIFY_DROP;
+}
+
+static int
+usif_notify_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
+{
+	struct nouveau_cli *cli = nouveau_cli(f);
+	struct nvif_client *client = &cli->base;
+	union {
+		struct nvif_ioctl_ntfy_new_v0 v0;
+	} *args = data;
+	union {
+		struct nvif_notify_req_v0 v0;
+	} *req;
+	struct usif_notify *ntfy;
+	int ret;
+
+	if (nvif_unpack(args->v0, 0, 0, true)) {
+		if (usif_notify_find(f, args->v0.index))
+			return -EEXIST;
+	} else
+		return ret;
+	req = data;
+
+	if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL)))
+		return -ENOMEM;
+	atomic_set(&ntfy->enabled, 0);
+
+	if (nvif_unpack(req->v0, 0, 0, true)) {
+		ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply;
+		ntfy->route = req->v0.route;
+		ntfy->token = req->v0.token;
+		req->v0.route = NVDRM_NOTIFY_USIF;
+		req->v0.token = (unsigned long)(void *)ntfy;
+		ret = nvif_client_ioctl(client, argv, argc);
+		req->v0.token = ntfy->token;
+		req->v0.route = ntfy->route;
+		ntfy->handle = args->v0.index;
+	}
+
+	if (ret == 0)
+		list_add(&ntfy->head, &cli->notifys);
+	if (ret)
+		kfree(ntfy);
+	return ret;
+}
+
+static int
+usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
+{
+	struct nouveau_cli *cli = nouveau_cli(f);
+	struct nvif_client *client = &cli->base;
+	union {
+		struct nvif_ioctl_ntfy_del_v0 v0;
+	} *args = data;
+	struct usif_notify *ntfy;
+	int ret;
+
+	if (nvif_unpack(args->v0, 0, 0, true)) {
+		if (!(ntfy = usif_notify_find(f, args->v0.index)))
+			return -ENOENT;
+	} else
+		return ret;
+
+	ret = nvif_client_ioctl(client, argv, argc);
+	if (ret == 0)
+		usif_notify_dtor(ntfy);
+	return ret;
+}
+
+static int
+usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
+{
+	struct nouveau_cli *cli = nouveau_cli(f);
+	struct nvif_client *client = &cli->base;
+	union {
+		struct nvif_ioctl_ntfy_del_v0 v0;
+	} *args = data;
+	struct usif_notify *ntfy;
+	int ret;
+
+	if (nvif_unpack(args->v0, 0, 0, true)) {
+		if (!(ntfy = usif_notify_find(f, args->v0.index)))
+			return -ENOENT;
+	} else
+		return ret;
+
+	if (atomic_xchg(&ntfy->enabled, 1))
+		return 0;
+
+	ntfy->p = kmalloc(sizeof(*ntfy->p) + ntfy->reply, GFP_KERNEL);
+	if (ret = -ENOMEM, !ntfy->p)
+		goto done;
+	ntfy->p->base.event = &ntfy->p->e.base;
+	ntfy->p->base.file_priv = f;
+	ntfy->p->base.pid = current->pid;
+	ntfy->p->base.destroy =(void(*)(struct drm_pending_event *))kfree;
+	ntfy->p->e.base.type = DRM_NOUVEAU_EVENT_NVIF;
+	ntfy->p->e.base.length = sizeof(ntfy->p->e.base) + ntfy->reply;
+
+	ret = nvif_client_ioctl(client, argv, argc);
+done:
+	if (ret) {
+		atomic_set(&ntfy->enabled, 0);
+		kfree(ntfy->p);
+	}
+	return ret;
+}
+
+static int
+usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
+{
+	struct nouveau_cli *cli = nouveau_cli(f);
+	struct nvif_client *client = &cli->base;
+	union {
+		struct nvif_ioctl_ntfy_put_v0 v0;
+	} *args = data;
+	struct usif_notify *ntfy;
+	int ret;
+
+	if (nvif_unpack(args->v0, 0, 0, true)) {
+		if (!(ntfy = usif_notify_find(f, args->v0.index)))
+			return -ENOENT;
+	} else
+		return ret;
+
+	ret = nvif_client_ioctl(client, argv, argc);
+	if (ret == 0 && atomic_xchg(&ntfy->enabled, 0))
+		kfree(ntfy->p);
+	return ret;
+}
+
+struct usif_object {
+	struct list_head head;
+	struct list_head ntfy;
+	u8  route;
+	u64 token;
+};
+
+static void
+usif_object_dtor(struct usif_object *object)
+{
+	list_del(&object->head);
+	kfree(object);
+}
+
+static int
+usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
+{
+	struct nouveau_cli *cli = nouveau_cli(f);
+	struct nvif_client *client = &cli->base;
+	union {
+		struct nvif_ioctl_new_v0 v0;
+	} *args = data;
+	struct usif_object *object;
+	int ret;
+
+	if (!(object = kmalloc(sizeof(*object), GFP_KERNEL)))
+		return -ENOMEM;
+	list_add(&object->head, &cli->objects);
+
+	if (nvif_unpack(args->v0, 0, 0, true)) {
+		object->route = args->v0.route;
+		object->token = args->v0.token;
+		args->v0.route = NVDRM_OBJECT_USIF;
+		args->v0.token = (unsigned long)(void *)object;
+		ret = nvif_client_ioctl(client, argv, argc);
+		args->v0.token = object->token;
+		args->v0.route = object->route;
+	}
+
+	if (ret)
+		usif_object_dtor(object);
+	return ret;
+}
+
+int
+usif_ioctl(struct drm_file *filp, void __user *user, u32 argc)
+{
+	struct nouveau_cli *cli = nouveau_cli(filp);
+	struct nvif_client *client = &cli->base;
+	void *data = kmalloc(argc, GFP_KERNEL);
+	u32   size = argc;
+	union {
+		struct nvif_ioctl_v0 v0;
+	} *argv = data;
+	struct usif_object *object;
+	u8 owner;
+	int ret;
+
+	if (ret = -ENOMEM, !argv)
+		goto done;
+	if (ret = -EFAULT, copy_from_user(argv, user, size))
+		goto done;
+
+	if (nvif_unpack(argv->v0, 0, 0, true)) {
+		/* block access to objects not created via this interface */
+		owner = argv->v0.owner;
+		argv->v0.owner = NVDRM_OBJECT_USIF;
+	} else
+		goto done;
+
+	mutex_lock(&cli->mutex);
+	switch (argv->v0.type) {
+	case NVIF_IOCTL_V0_NEW:
+		/* ... except if we're creating children */
+		argv->v0.owner = NVIF_IOCTL_V0_OWNER_ANY;
+		ret = usif_object_new(filp, data, size, argv, argc);
+		break;
+	case NVIF_IOCTL_V0_NTFY_NEW:
+		ret = usif_notify_new(filp, data, size, argv, argc);
+		break;
+	case NVIF_IOCTL_V0_NTFY_DEL:
+		ret = usif_notify_del(filp, data, size, argv, argc);
+		break;
+	case NVIF_IOCTL_V0_NTFY_GET:
+		ret = usif_notify_get(filp, data, size, argv, argc);
+		break;
+	case NVIF_IOCTL_V0_NTFY_PUT:
+		ret = usif_notify_put(filp, data, size, argv, argc);
+		break;
+	default:
+		ret = nvif_client_ioctl(client, argv, argc);
+		break;
+	}
+	if (argv->v0.route == NVDRM_OBJECT_USIF) {
+		object = (void *)(unsigned long)argv->v0.token;
+		argv->v0.route = object->route;
+		argv->v0.token = object->token;
+		if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) {
+			list_del(&object->head);
+			kfree(object);
+		}
+	} else {
+		argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN;
+		argv->v0.token = 0;
+	}
+	argv->v0.owner = owner;
+	mutex_unlock(&cli->mutex);
+
+	if (copy_to_user(user, argv, argc))
+		ret = -EFAULT;
+done:
+	kfree(argv);
+	return ret;
+}
+
+void
+usif_client_fini(struct nouveau_cli *cli)
+{
+	struct usif_object *object, *otemp;
+	struct usif_notify *notify, *ntemp;
+
+	list_for_each_entry_safe(notify, ntemp, &cli->notifys, head) {
+		usif_notify_dtor(notify);
+	}
+
+	list_for_each_entry_safe(object, otemp, &cli->objects, head) {
+		usif_object_dtor(object);
+	}
+}
+
+void
+usif_client_init(struct nouveau_cli *cli)
+{
+	INIT_LIST_HEAD(&cli->objects);
+	INIT_LIST_HEAD(&cli->notifys);
+}
diff --git a/drm/nouveau_usif.h b/drm/nouveau_usif.h
new file mode 100644
index 00000000..c037e3ae
--- /dev/null
+++ b/drm/nouveau_usif.h
@@ -0,0 +1,9 @@
+#ifndef __NOUVEAU_USIF_H__
+#define __NOUVEAU_USIF_H__
+
+void usif_client_init(struct nouveau_cli *);
+void usif_client_fini(struct nouveau_cli *);
+int  usif_ioctl(struct drm_file *, void __user *, u32);
+int  usif_notify(const void *, u32, const void *, u32);
+
+#endif
diff --git a/drm/uapi/drm/nouveau_drm.h b/drm/uapi/drm/nouveau_drm.h
index ed0b7bd4..0d7608dc 100644
--- a/drm/uapi/drm/nouveau_drm.h
+++ b/drm/uapi/drm/nouveau_drm.h
@@ -25,6 +25,8 @@
 #ifndef __NOUVEAU_DRM_H__
 #define __NOUVEAU_DRM_H__
 
+#define DRM_NOUVEAU_EVENT_NVIF                                       0x80000000
+
 /* reserved object handles when using deprecated object APIs - these
  * are here so that libdrm can allow interoperability with the new
  * object APIs
@@ -131,6 +133,7 @@ struct drm_nouveau_gem_cpu_fini {
 #define DRM_NOUVEAU_GROBJ_ALLOC        0x04 /* deprecated */
 #define DRM_NOUVEAU_NOTIFIEROBJ_ALLOC  0x05 /* deprecated */
 #define DRM_NOUVEAU_GPUOBJ_FREE        0x06 /* deprecated */
+#define DRM_NOUVEAU_NVIF               0x07
 #define DRM_NOUVEAU_GEM_NEW            0x40
 #define DRM_NOUVEAU_GEM_PUSHBUF        0x41
 #define DRM_NOUVEAU_GEM_CPU_PREP       0x42
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 9eef51dc..00f8088b 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -2,9 +2,11 @@ noinst_LTLIBRARIES = libpciaccessos.la
 
 libpciaccessos_la_CPPFLAGS = -I${top_srcdir}/nvkm/include \
 			     -I${top_srcdir}/nvkm \
-			     -I${top_srcdir}
+			     -I${top_srcdir} \
+			     -I/usr/include/libdrm
 libpciaccessos_la_CFLAGS = @PCIACCESS_CFLAGS@
-libpciaccessos_la_LIBADD = @PCIACCESS_LIBS@ -lpthread \
+libpciaccessos_la_LIBADD = @PCIACCESS_LIBS@ -lpthread -ldrm \
 			   $(top_srcdir)/nvkm/libnvkm.la
 libpciaccessos_la_SOURCES = intr.c \
-			    main.c
+			    main.c \
+			    kern.c
diff --git a/lib/kern.c b/lib/kern.c
new file mode 100644
index 00000000..47725862
--- /dev/null
+++ b/lib/kern.c
@@ -0,0 +1,218 @@
+/*
+ * Copyright 2014 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 <bskeggs@redhat.com>
+ */
+
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+
+#include <xf86drm.h>
+
+#include <nvif/client.h>
+#include <nvif/driver.h>
+#include <nvif/notify.h>
+#include <nvif/unpack.h>
+#include <nvif/event.h>
+#include <nvif/ioctl.h>
+
+#include <drm/uapi/drm/nouveau_drm.h>
+
+struct drm_client_priv {
+	int fd;
+	u32 version;
+	pthread_t event;
+	bool done;
+};
+
+static void
+drm_client_unmap(void *priv, void *ptr, u32 size)
+{
+}
+
+static void *
+drm_client_map(void *priv, u64 handle, u32 size)
+{
+	return NULL;
+}
+
+static int
+drm_client_ioctl(void *priv, bool super, void *data, u32 size, void **hack)
+{
+	const unsigned long request = DRM_IOC(DRM_IOC_READWRITE, DRM_IOCTL_BASE,
+					      DRM_COMMAND_BASE +
+					      DRM_NOUVEAU_NVIF, size);
+	struct drm_client_priv *drm = priv;
+	int ret = ioctl(drm->fd, request, data);
+	if (ret < 0)
+		return -errno;
+	return ret;
+}
+
+static int
+drm_client_resume(void *priv)
+{
+	return -EINVAL;
+}
+
+static int
+drm_client_suspend(void *priv)
+{
+	return -ENOSYS;
+}
+
+static void
+drm_client_notify(void *repv, u32 repc)
+{
+	union {
+		struct nvif_notify_rep_v0 v0;
+	} *rep = repv;
+	void *data = repv;
+	u32 size = repc;
+	u64 token;
+	u8  route;
+	int ret;
+
+	printf("notify %d\n", repc);
+
+	if (nvif_unpack(rep->v0, 0, 0, true)) {
+		token = rep->v0.token;
+		route = rep->v0.route;
+	} else
+		assert(0);
+
+	switch (route) {
+	case NVIF_NOTIFY_V0_ROUTE_NVIF: {
+		struct nvif_notify *notify = (void *)(unsigned long)token;
+		assert(notify);
+		nvif_notify(repv, sizeof(rep->v0), data, size);
+	}
+		break;
+	default:
+		assert(0);
+		break;
+	}
+}
+
+static void *
+drm_client_event(void *arg)
+{
+	struct drm_client_priv *drm = arg;
+	struct drm_event *e;
+	char data[1024];
+	ssize_t size;
+	int i;
+
+	while (1) {
+		if ((size = read(drm->fd, data, sizeof(data))) <= 0)
+			continue;
+
+		for (i = 0; e = (void *)&data[i], i < size; i += e->length) {
+			u32 size = e->length - sizeof(*e);
+			u8 *data = (u8 *)e + sizeof(*e);
+			switch (e->type) {
+			case DRM_NOUVEAU_EVENT_NVIF:
+				drm_client_notify(data, size);
+				continue;
+			default:
+				break;
+			}
+			fprintf(stderr, "event %08x, %d\n", e->type, size);
+		}
+	}
+
+	return NULL;
+}
+
+static void
+drm_client_fini(void *priv)
+{
+	struct drm_client_priv *drm = priv;
+	if (drm) {
+		if (drm->fd >= 0) {
+			if (drm->done) {
+				pthread_cancel(drm->event);
+				pthread_join(drm->event, NULL);
+			}
+			close(drm->fd);
+		}
+		free(drm);
+	}
+}
+
+#define DRM_RENDER_PATH "/dev/dri/renderD"
+#define DRM_RENDER_MIN   128
+#define DRM_RENDER_MAX  (128 + 63)
+static int
+drm_client_init(const char *name, u64 device, const char *cfg,
+		const char *dbg, void **ppriv)
+{
+	struct drm_client_priv *drm;
+	drmVersionPtr ver;
+	int ret, minor;
+	char path[128];
+
+	if (ret = -ENOMEM, !(drm = *ppriv = malloc(sizeof(*drm))))
+		goto fail;
+
+	for (minor = DRM_RENDER_MIN; minor <= DRM_RENDER_MAX; minor++) {
+		snprintf(path, sizeof(path), "/dev/dri/renderD%d", minor);
+		if ((drm->fd = open(path, O_RDWR, 0)) < 0)
+			continue;
+		if ((ver = drmGetVersion(drm->fd)) == NULL)
+			continue;
+		if (!strcmp(ver->name, "nouveau"))
+			break;
+		free(ver);
+	}
+
+	if (ret = -ENODEV, minor > DRM_RENDER_MAX)
+		goto fail;
+
+	drm->version = (ver->version_major << 24) |
+		       (ver->version_minor << 8) |
+		        ver->version_patchlevel;
+	free(ver);
+	if (ret = -ENOSYS, drm->version < 0x01000200)
+		goto fail;
+
+	if ((ret = pthread_create(&drm->event, NULL, drm_client_event, drm)))
+		goto fail;
+
+	drm->done = true;
+	return 0;
+fail:
+	drm_client_fini(drm);
+	return ret;
+}
+
+const struct nvif_driver
+nvif_driver_drm = {
+	.name = "drm",
+	.init = drm_client_init,
+	.fini = drm_client_fini,
+	.suspend = drm_client_suspend,
+	.resume = drm_client_resume,
+	.ioctl = drm_client_ioctl,
+	.map = drm_client_map,
+	.unmap = drm_client_unmap,
+	.keep = true,
+};
diff --git a/nvif/client.c b/nvif/client.c
index 20fb3868..3c4df1fc 100644
--- a/nvif/client.c
+++ b/nvif/client.c
@@ -60,6 +60,7 @@ nvif_drivers[] = {
 #ifdef __KERNEL__
 	&nvif_driver_nvkm,
 #else
+	&nvif_driver_drm,
 	&nvif_driver_lib,
 #endif
 	NULL
diff --git a/nvif/driver.h b/nvif/driver.h
index ea5b1b88..b72a8f0c 100644
--- a/nvif/driver.h
+++ b/nvif/driver.h
@@ -15,6 +15,7 @@ struct nvif_driver {
 };
 
 extern const struct nvif_driver nvif_driver_nvkm;
+extern const struct nvif_driver nvif_driver_drm;
 extern const struct nvif_driver nvif_driver_lib;
 
 #endif