drm/nouveau/nvkm: add a replacement for nvkm_notify

This replaces the twisty, confusing, relationship between nvkm_event and
nvkm_notify with something much simpler, and less racey.  It also places
events in the object tree hierarchy, which will allow a heap of the code
tracking events across allocation/teardown/suspend to be removed.

This commit just adds the new interfaces, and passes the owning subdev to
the event constructor to enable debug-tracing in the new code.

v2:
- use ?: (lyude)

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

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/include/nvif/event.h b/drivers/gpu/drm/nouveau/include/nvif/event.h
index a6b1ee4f10ca..a510ba4ad487 100644
--- a/drivers/gpu/drm/nouveau/include/nvif/event.h
+++ b/drivers/gpu/drm/nouveau/include/nvif/event.h
@@ -1,6 +1,38 @@
 /* SPDX-License-Identifier: MIT */
 #ifndef __NVIF_EVENT_H__
 #define __NVIF_EVENT_H__
+#include <nvif/object.h>
+#include <nvif/if000e.h>
+struct nvif_event;
+
+#define NVIF_EVENT_KEEP 0
+#define NVIF_EVENT_DROP 1
+typedef int (*nvif_event_func)(struct nvif_event *, void *repv, u32 repc);
+
+struct nvif_event {
+	struct nvif_object object;
+	nvif_event_func func;
+};
+
+static inline bool
+nvif_event_constructed(struct nvif_event *event)
+{
+	return nvif_object_constructed(&event->object);
+}
+
+int nvif_event_ctor_(struct nvif_object *, const char *, u32, nvif_event_func, bool,
+		     struct nvif_event_v0 *, u32, bool, struct nvif_event *);
+
+static inline int
+nvif_event_ctor(struct nvif_object *parent, const char *name, u32 handle, nvif_event_func func,
+		bool wait, struct nvif_event_v0 *args, u32 argc, struct nvif_event *event)
+{
+	return nvif_event_ctor_(parent, name, handle, func, wait, args, argc, true, event);
+}
+
+void nvif_event_dtor(struct nvif_event *);
+int nvif_event_allow(struct nvif_event *);
+int nvif_event_block(struct nvif_event *);
 
 struct nvif_notify_req_v0 {
 	__u8  version;