[PATCH 24/29] drm/i915/gvt: remove the extra vfio_device refcounting for dmabufs

From: Christoph Hellwig <hch@lst.de>
To: Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	Zhenyu Wang <zhenyuw@linux.intel.com>,
	Zhi Wang <zhi.a.wang@intel.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
	intel-gfx@lists.freedesktop.org,
	intel-gvt-dev@lists.freedesktop.org,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH 24/29] drm/i915/gvt: remove the extra vfio_device refcounting for dmabufs
Date: Tue,  2 Nov 2021 08:05:56 +0100	[thread overview]
Message-ID: <20211102070601.155501-25-hch@lst.de> (raw)
In-Reply-To: <20211102070601.155501-1-hch@lst.de>

All the dmabufs are torn down when th VGPU is released, so there is
no need for extra refcounting here.

Based on an patch from Jason Gunthorpe.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/gpu/drm/i915/gvt/dmabuf.c | 12 ------------
 drivers/gpu/drm/i915/gvt/gvt.h    |  1 -
 2 files changed, 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/dmabuf.c b/drivers/gpu/drm/i915/gvt/dmabuf.c
index eacfe7beaaf67..88c4f8b02ffb6 100644
--- a/drivers/gpu/drm/i915/gvt/dmabuf.c
+++ b/drivers/gpu/drm/i915/gvt/dmabuf.c
@@ -134,7 +134,6 @@ static void dmabuf_gem_object_free(struct kref *kref)
 					struct intel_vgpu_dmabuf_obj, list);
 			if (dmabuf_obj == obj) {
 				list_del(pos);
-				vfio_device_put(vgpu->vfio_device);
 				idr_remove(&vgpu->object_idr,
 					   dmabuf_obj->dmabuf_id);
 				kfree(dmabuf_obj->info);
@@ -474,16 +473,6 @@ int intel_vgpu_query_plane(struct intel_vgpu *vgpu, void *args)
 
 	kref_init(&dmabuf_obj->kref);
 
-	mutex_lock(&vgpu->dmabuf_lock);
-	vgpu->vfio_device = vfio_device_get_from_dev(mdev_dev(vgpu->mdev));
-	if (!vgpu->vfio_device) {
-		gvt_vgpu_err("failed to get vfio device\n");
-		mutex_unlock(&vgpu->dmabuf_lock);
-		ret = -ENODEV;
-		goto out_free_info;
-	}
-	mutex_unlock(&vgpu->dmabuf_lock);
-
 	update_fb_info(gfx_plane_info, &fb_info);
 
 	INIT_LIST_HEAD(&dmabuf_obj->list);
@@ -589,7 +578,6 @@ void intel_vgpu_dmabuf_cleanup(struct intel_vgpu *vgpu)
 		dmabuf_obj->vgpu = NULL;
 
 		idr_remove(&vgpu->object_idr, dmabuf_obj->dmabuf_id);
-		vfio_device_put(vgpu->vfio_device);
 		list_del(pos);
 
 		/* dmabuf_obj might be freed in dmabuf_obj_put */
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 7c87d7638e6b2..fa83365227514 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -230,7 +230,6 @@ struct intel_vgpu {
 	struct kvm *kvm;
 	struct work_struct release_work;
 	atomic_t released;
-	struct vfio_device *vfio_device;
 	struct vfio_group *vfio_group;
 
 	struct kvm_page_track_notifier_node track_node;
-- 
2.30.2

