1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/core/uevent.c b/drivers/gpu/drm/nouveau/nvkm/core/uevent.c
new file mode 100644
index 000000000000..ba9d9edaec75
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/core/uevent.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2021 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.
+ */
+#define nvkm_uevent(p) container_of((p), struct nvkm_uevent, object)
+#include <core/event.h>
+#include <core/client.h>
+
+#include <nvif/if000e.h>
+
+struct nvkm_uevent {
+	struct nvkm_object object;
+	struct nvkm_object *parent;
+	nvkm_uevent_func func;
+	bool wait;
+
+	struct nvkm_event_ntfy ntfy;
+	atomic_t allowed;
+};
+
+static int
+nvkm_uevent_mthd_block(struct nvkm_uevent *uevent, union nvif_event_block_args *args, u32 argc)
+{
+	if (argc != sizeof(args->vn))
+		return -ENOSYS;
+
+	nvkm_event_ntfy_block(&uevent->ntfy);
+	atomic_set(&uevent->allowed, 0);
+	return 0;
+}
+
+static int
+nvkm_uevent_mthd_allow(struct nvkm_uevent *uevent, union nvif_event_allow_args *args, u32 argc)
+{
+	if (argc != sizeof(args->vn))
+		return -ENOSYS;
+
+	nvkm_event_ntfy_allow(&uevent->ntfy);
+	atomic_set(&uevent->allowed, 1);
+	return 0;
+}
+
+static int
+nvkm_uevent_mthd(struct nvkm_object *object, u32 mthd, void *argv, u32 argc)
+{
+	struct nvkm_uevent *uevent = nvkm_uevent(object);
+
+	switch (mthd) {
+	case NVIF_EVENT_V0_ALLOW: return nvkm_uevent_mthd_allow(uevent, argv, argc);
+	case NVIF_EVENT_V0_BLOCK: return nvkm_uevent_mthd_block(uevent, argv, argc);
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
+static int
+nvkm_uevent_fini(struct nvkm_object *object, bool suspend)
+{
+	struct nvkm_uevent *uevent = nvkm_uevent(object);
+
+	nvkm_event_ntfy_block(&uevent->ntfy);
+	return 0;
+}
+
+static int
+nvkm_uevent_init(struct nvkm_object *object)
+{
+	struct nvkm_uevent *uevent = nvkm_uevent(object);
+
+	if (atomic_read(&uevent->allowed))
+		nvkm_event_ntfy_allow(&uevent->ntfy);
+
+	return 0;
+}
+
+static void *
+nvkm_uevent_dtor(struct nvkm_object *object)
+{
+	struct nvkm_uevent *uevent = nvkm_uevent(object);
+
+	nvkm_event_ntfy_del(&uevent->ntfy);
+	return uevent;
+}
+
+static const struct nvkm_object_func
+nvkm_uevent = {
+	.dtor = nvkm_uevent_dtor,
+	.init = nvkm_uevent_init,
+	.fini = nvkm_uevent_fini,
+	.mthd = nvkm_uevent_mthd,
+};
+
+static int
+nvkm_uevent_ntfy(struct nvkm_event_ntfy *ntfy, u32 bits)
+{
+	struct nvkm_uevent *uevent = container_of(ntfy, typeof(*uevent), ntfy);
+	struct nvkm_client *client = uevent->object.client;
+
+	if (uevent->func)
+		return uevent->func(uevent->parent, uevent->object.token, bits);
+
+	return client->event(uevent->object.token, NULL, 0);
+}
+
+int
+nvkm_uevent_add(struct nvkm_uevent *uevent, struct nvkm_event *event, int id, u32 bits,
+		nvkm_uevent_func func)
+{
+	if (WARN_ON(uevent->func))
+		return -EBUSY;
+
+	nvkm_event_ntfy_add(event, id, bits, uevent->wait, nvkm_uevent_ntfy, &uevent->ntfy);
+	uevent->func = func;
+	return 0;
+}
+
+int
+nvkm_uevent_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
+		struct nvkm_object **pobject)
+{
+	struct nvkm_object *parent = oclass->parent;
+	struct nvkm_uevent *uevent;
+	union nvif_event_args *args = argv;
+
+	if (argc < sizeof(args->v0) || args->v0.version != 0)
+		return -ENOSYS;
+
+	if (!(uevent = kzalloc(sizeof(*uevent), GFP_KERNEL)))
+		return -ENOMEM;
+	*pobject = &uevent->object;
+
+	nvkm_object_ctor(&nvkm_uevent, oclass, &uevent->object);
+	uevent->parent = parent;
+	uevent->func = NULL;
+	uevent->wait = args->v0.wait;
+	uevent->ntfy.event = NULL;
+	return parent->func->uevent(parent, &args->v0.data, argc - sizeof(args->v0), uevent);
+}