drm/nouveau/disp: introduce object to track per-head functions/state

Primarily intended as a way to pass per-head state around during
supervisor handling, and share logic between NV50/GF119.

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

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/head.h b/drivers/gpu/drm/nouveau/nvkm/engine/disp/head.h
new file mode 100644
index 000000000000..a8ae6cbc0ff1
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/head.h
@@ -0,0 +1,30 @@
+#ifndef __NVKM_DISP_HEAD_H__
+#define __NVKM_DISP_HEAD_H__
+#include "priv.h"
+
+struct nvkm_head {
+	const struct nvkm_head_func *func;
+	struct nvkm_disp *disp;
+	int id;
+
+	struct list_head head;
+};
+
+int nvkm_head_new_(const struct nvkm_head_func *, struct nvkm_disp *, int id);
+void nvkm_head_del(struct nvkm_head **);
+struct nvkm_head *nvkm_head_find(struct nvkm_disp *, int id);
+
+struct nvkm_head_func {
+};
+
+#define HEAD_MSG(h,l,f,a...) do {                                              \
+	struct nvkm_head *_h = (h);                                            \
+	nvkm_##l(&_h->disp->engine.subdev, "head-%d: "f"\n", _h->id, ##a);     \
+} while(0)
+#define HEAD_WARN(h,f,a...) HEAD_MSG((h), warn, f, ##a)
+#define HEAD_DBG(h,f,a...) HEAD_MSG((h), debug, f, ##a)
+
+int nv04_head_new(struct nvkm_disp *, int id);
+int nv50_head_new(struct nvkm_disp *, int id);
+int gf119_head_new(struct nvkm_disp *, int id);
+#endif