drm/nouveau/gsp: add common code for engines/engine objects

With minimal to no direct HW programming required, most nvkm_engine
implementations are nearly identical when running on top of GSP-RM.

Add a common implementation of the boilerplate, and use nvkm_rm_gpu to
expose the correct class IDs.

As they're now handled by common code, and there's no support for them
prior to GSP-RM support - this deletes the GA100 NVDEC/NVJPG/OFA HALs,
the GA102 NVENC/OFA HALs, and the AD102 GR/NVDEC/NVENC/NVJPG/OFA HALs.

Signed-off-by: Ben Skeggs <bskeggs@nvidia.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Timur Tabi <ttabi@nvidia.com>
Tested-by: Timur Tabi <ttabi@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/gr.c b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/gr.c
new file mode 100644
index 000000000000..22aa894da79d
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/gr.c
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (c) 2025, NVIDIA CORPORATION. All rights reserved.
+ */
+#include "gr.h"
+
+#include <engine/fifo.h>
+#include <engine/gr/priv.h>
+
+static int
+nvkm_rm_gr_obj_ctor(const struct nvkm_oclass *oclass, void *argv, u32 argc,
+		    struct nvkm_object **pobject)
+{
+	struct r535_gr_chan *chan = container_of(oclass->parent, typeof(*chan), object);
+
+	return nvkm_rm_engine_obj_new(&chan->chan->rm.object, chan->chan->id, oclass, pobject);
+}
+
+int
+nvkm_rm_gr_new(struct nvkm_rm *rm)
+{
+	const u32 classes[] = {
+		rm->gpu->gr.class.i2m,
+		rm->gpu->gr.class.twod,
+		rm->gpu->gr.class.threed,
+		rm->gpu->gr.class.compute,
+	};
+	struct nvkm_gr_func *func;
+	struct r535_gr *gr;
+
+	func = kzalloc(struct_size(func, sclass, ARRAY_SIZE(classes) + 1), GFP_KERNEL);
+	if (!func)
+		return -ENOMEM;
+
+	func->dtor = r535_gr_dtor;
+	func->oneinit = r535_gr_oneinit;
+	func->units = r535_gr_units;
+	func->chan_new = r535_gr_chan_new;
+
+	for (int i = 0; i < ARRAY_SIZE(classes); i++) {
+		func->sclass[i].oclass = classes[i];
+		func->sclass[i].minver = -1;
+		func->sclass[i].maxver = 0;
+		func->sclass[i].ctor = nvkm_rm_gr_obj_ctor;
+	}
+
+	gr = kzalloc(sizeof(*gr), GFP_KERNEL);
+	if (!gr) {
+		kfree(func);
+		return -ENOMEM;
+	}
+
+	nvkm_gr_ctor(func, rm->device, NVKM_ENGINE_GR, 0, true, &gr->base);
+	rm->device->gr = &gr->base;
+	return 0;
+}