linux-kernel - [RFC 5/7] vdpa: Add new vdpa_config

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Message-Id: <20230923170540.1447301-6-lulu@redhat.com>
Date:   Sun, 24 Sep 2023 01:05:38 +0800
From:   Cindy Lu <lulu@...hat.com>
To:     lulu@...hat.com, jasowang@...hat.com, mst@...hat.com,
        yi.l.liu@...el.com, jgg@...dia.com, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [RFC 5/7] vdpa: Add new vdpa_config_ops

Add new vdpa_config_ops to support iommufd

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 include/linux/vdpa.h | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 6d0f5e4e82c2..4ada5bd6f90e 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -5,6 +5,7 @@
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
+#include <linux/iommufd.h>
 #include <linux/vhost_iotlb.h>
 #include <linux/virtio_net.h>
 #include <linux/if_ether.h>
@@ -91,6 +92,12 @@ struct vdpa_device {
 	struct vdpa_mgmt_dev *mdev;
 	unsigned int ngroups;
 	unsigned int nas;
+	struct iommufd_access *iommufd_access;
+	struct iommufd_device *iommufd_device;
+	struct iommufd_ctx *iommufd_ictx;
+	unsigned long *vq_bitmap;
+	atomic_t iommufd_users;
+	bool iommufd_attached;
 };
 
 /**
@@ -282,6 +289,15 @@ struct vdpa_map_file {
  *				@iova: iova to be unmapped
  *				@size: size of the area
  *				Returns integer: success (0) or error (< 0)
+ * @bind_iommufd:              use vdpa_iommufd_physical_bind for an IOMMU
+ *                             backed device.
+ *                             otherwise use vdpa_iommufd_emulated_bind
+ * @unbind_iommufd:            use vdpa_iommufd_physical_unbind for an IOMMU
+ *                             backed device.
+ *                             otherwise, use vdpa_iommufd_emulated_unbind
+ * @attach_ioas:               use vdpa_iommufd_physical_attach_ioas for an
+ *                             IOMMU backed device.
+ * @detach_ioas:               Opposite of attach_ioas
  * @free:			Free resources that belongs to vDPA (optional)
  *				@vdev: vdpa device
  */
@@ -341,6 +357,12 @@ struct vdpa_config_ops {
 			 u64 iova, u64 size);
 	int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
 			      unsigned int asid);
+	/* IOMMUFD ops */
+	int (*bind_iommufd)(struct vdpa_device *vdev, struct iommufd_ctx *ictx,
+			    u32 *out_device_id);
+	void (*unbind_iommufd)(struct vdpa_device *vdev);
+	int (*attach_ioas)(struct vdpa_device *vdev, u32 *pt_id);
+	int (*detach_ioas)(struct vdpa_device *vdev);
 
 	/* Free device resources */
 	void (*free)(struct vdpa_device *vdev);
@@ -510,4 +532,14 @@ struct vdpa_mgmt_dev {
 int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev);
 void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev);
 
-#endif /* _LINUX_VDPA_H */
+int vdpa_iommufd_physical_bind(struct vdpa_device *vdpa,
+			       struct iommufd_ctx *ictx, u32 *out_device_id);
+void vdpa_iommufd_physical_unbind(struct vdpa_device *vdpa);
+int vdpa_iommufd_physical_attach_ioas(struct vdpa_device *vdpa, u32 *pt_id);
+int vdpa_iommufd_emulated_bind(struct vdpa_device *vdpa,
+			       struct iommufd_ctx *ictx, u32 *out_device_id);
+void vdpa_iommufd_emulated_unbind(struct vdpa_device *vdpa);
+int vdpa_iommufd_emulated_attach_ioas(struct vdpa_device *vdpa, u32 *pt_id);
+int vdpa_iommufd_emulated_detach_ioas(struct vdpa_device *vdpa);
+
+#endif
-- 
2.34.3