[RFC 12/29] nvkm/vgpu: introduce GSP RM control interface for vGPU

[Zhi Wang]

To talk to the GSP firmware, the first step is allocating a GSP RM client.
The second step is issuing GSP RM controls to access the functions
provided by GSP firmware.

The NVIDIA vGPU VFIO module requires a GSP RM control interface to obtain
the system information, create and configure vGPUs.

Implement the GSP RM control interface based on nvkm routines.

Signed-off-by: Zhi Wang <zhiw at nvidia.com>
---
 drivers/gpu/drm/nouveau/nvkm/vgpu_mgr/vfio.c | 34 ++++++++++++++++++++
 include/drm/nvkm_vgpu_mgr_vfio.h             |  8 +++++
 2 files changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nvkm/vgpu_mgr/vfio.c b/drivers/gpu/drm/nouveau/nvkm/vgpu_mgr/vfio.c
index a0b4be2e1085..9732e43a5d6b 100644
--- a/drivers/gpu/drm/nouveau/nvkm/vgpu_mgr/vfio.c
+++ b/drivers/gpu/drm/nouveau/nvkm/vgpu_mgr/vfio.c
@@ -98,6 +98,36 @@ static u32 get_gsp_client_handle(struct nvidia_vgpu_gsp_client *client)
 	return c->object.handle;
 }
 
+static void *rm_ctrl_get(struct nvidia_vgpu_gsp_client *client, u32 cmd,
+			 u32 size)
+{
+	struct nvkm_gsp_device *device = client->gsp_device;
+
+	return nvkm_gsp_rm_ctrl_get(&device->subdevice, cmd, size);
+}
+
+static int rm_ctrl_wr(struct nvidia_vgpu_gsp_client *client, void *ctrl)
+{
+	struct nvkm_gsp_device *device = client->gsp_device;
+
+	return nvkm_gsp_rm_ctrl_wr(&device->subdevice, ctrl);
+}
+
+static void *rm_ctrl_rd(struct nvidia_vgpu_gsp_client *client, u32 cmd,
+			u32 size)
+{
+	struct nvkm_gsp_device *device = client->gsp_device;
+
+	return nvkm_gsp_rm_ctrl_rd(&device->subdevice, cmd, size);
+}
+
+static void rm_ctrl_done(struct nvidia_vgpu_gsp_client *client, void *ctrl)
+{
+	struct nvkm_gsp_device *device = client->gsp_device;
+
+	nvkm_gsp_rm_ctrl_done(&device->subdevice, ctrl);
+}
+
 struct nvkm_vgpu_mgr_vfio_ops nvkm_vgpu_mgr_vfio_ops = {
 	.vgpu_mgr_is_enabled = vgpu_mgr_is_enabled,
 	.get_handle = get_handle,
@@ -106,6 +136,10 @@ struct nvkm_vgpu_mgr_vfio_ops nvkm_vgpu_mgr_vfio_ops = {
 	.alloc_gsp_client = alloc_gsp_client,
 	.free_gsp_client = free_gsp_client,
 	.get_gsp_client_handle = get_gsp_client_handle,
+	.rm_ctrl_get = rm_ctrl_get,
+	.rm_ctrl_wr = rm_ctrl_wr,
+	.rm_ctrl_rd = rm_ctrl_rd,
+	.rm_ctrl_done = rm_ctrl_done,
 };
 
 /**
diff --git a/include/drm/nvkm_vgpu_mgr_vfio.h b/include/drm/nvkm_vgpu_mgr_vfio.h
index 79920cc27055..29ff9b39d0b2 100644
--- a/include/drm/nvkm_vgpu_mgr_vfio.h
+++ b/include/drm/nvkm_vgpu_mgr_vfio.h
@@ -27,6 +27,14 @@ struct nvkm_vgpu_mgr_vfio_ops {
 				struct nvidia_vgpu_gsp_client *client);
 	void (*free_gsp_client)(struct nvidia_vgpu_gsp_client *client);
 	u32 (*get_gsp_client_handle)(struct nvidia_vgpu_gsp_client *client);
+	void *(*rm_ctrl_get)(struct nvidia_vgpu_gsp_client *client,
+			     u32 cmd, u32 size);
+	int (*rm_ctrl_wr)(struct nvidia_vgpu_gsp_client *client,
+			  void *ctrl);
+	void *(*rm_ctrl_rd)(struct nvidia_vgpu_gsp_client *client, u32 cmd,
+			    u32 size);
+	void (*rm_ctrl_done)(struct nvidia_vgpu_gsp_client *client,
+			     void *ctrl);
 };
 
 struct nvkm_vgpu_mgr_vfio_ops *nvkm_vgpu_mgr_get_vfio_ops(void *handle);
-- 
2.34.1