[RFC 20/29] vfio/vgpu_mgr: allocate GSP RM client for NVIDIA vGPU manager

[Zhi Wang]

A GSP RM client is required when talking to the GSP firmware via GSP RM
controls.

In order to create vGPUs, NVIDIA vGPU manager requires a GSP RM client to
upload vGPU types to GSP.

Allocate a dedicated GSP RM client for NVIDIA vGPU manager.

Signed-off-by: Zhi Wang <zhiw at nvidia.com>
---
 drivers/vfio/pci/nvidia-vgpu/nvkm.h     | 9 +++++++++
 drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.c | 8 ++++++++
 drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.h | 2 ++
 3 files changed, 19 insertions(+)

diff --git a/drivers/vfio/pci/nvidia-vgpu/nvkm.h b/drivers/vfio/pci/nvidia-vgpu/nvkm.h
index 4c75431ee1f6..939f3b420bb3 100644
--- a/drivers/vfio/pci/nvidia-vgpu/nvkm.h
+++ b/drivers/vfio/pci/nvidia-vgpu/nvkm.h
@@ -43,4 +43,13 @@ static inline int nvidia_vgpu_mgr_get_handle(struct pci_dev *pdev,
 #define nvidia_vgpu_mgr_detach_handle(h) \
 	(h)->ops->detach_handle((h)->pf_drvdata)
 
+#define nvidia_vgpu_mgr_alloc_gsp_client(m, c) \
+	m->handle.ops->alloc_gsp_client(m->handle.pf_drvdata, c)
+
+#define nvidia_vgpu_mgr_free_gsp_client(m, c) \
+	m->handle.ops->free_gsp_client(c)
+
+#define nvidia_vgpu_mgr_get_gsp_client_handle(m, c) \
+	m->handle.ops->get_gsp_client_handle(c)
+
 #endif
diff --git a/drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.c b/drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.c
index dc2a73f95650..812b7be00bee 100644
--- a/drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.c
+++ b/drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.c
@@ -12,6 +12,7 @@ static void vgpu_mgr_release(struct kref *kref)
 	struct nvidia_vgpu_mgr *vgpu_mgr =
 		container_of(kref, struct nvidia_vgpu_mgr, refcount);
 
+	nvidia_vgpu_mgr_free_gsp_client(vgpu_mgr, &vgpu_mgr->gsp_client);
 	nvidia_vgpu_mgr_detach_handle(&vgpu_mgr->handle);
 	kvfree(vgpu_mgr);
 }
@@ -82,9 +83,16 @@ struct nvidia_vgpu_mgr *nvidia_vgpu_mgr_get(struct pci_dev *dev)
 	kref_init(&vgpu_mgr->refcount);
 	mutex_init(&vgpu_mgr->vgpu_id_lock);
 
+	ret = nvidia_vgpu_mgr_alloc_gsp_client(vgpu_mgr,
+					       &vgpu_mgr->gsp_client);
+	if (ret)
+		goto fail_alloc_gsp_client;
+
 	mutex_unlock(&vgpu_mgr_attach_lock);
 	return vgpu_mgr;
 
+fail_alloc_gsp_client:
+	nvidia_vgpu_mgr_detach_handle(&vgpu_mgr->handle);
 fail_attach_handle:
 	kvfree(vgpu_mgr);
 fail_alloc_vgpu_mgr:
diff --git a/drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.h b/drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.h
index 2efd96644098..f4416e6ed8f9 100644
--- a/drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.h
+++ b/drivers/vfio/pci/nvidia-vgpu/vgpu_mgr.h
@@ -32,6 +32,8 @@ struct nvidia_vgpu_mgr {
 	struct mutex vgpu_id_lock;
 	struct nvidia_vgpu *vgpus[NVIDIA_MAX_VGPUS];
 	atomic_t num_vgpus;
+
+	struct nvidia_vgpu_gsp_client gsp_client;
 };
 
 struct nvidia_vgpu_mgr *nvidia_vgpu_mgr_get(struct pci_dev *dev);
-- 
2.34.1