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authorJason Wang <jasowang@redhat.com>2020-03-26 17:01:20 +0300
committerMichael S. Tsirkin <mst@redhat.com>2020-04-01 19:06:26 +0300
commit9ad9c49cfe970b053bb0ef323b682dd1b4d4f8a0 (patch)
tree92f1cb32d9e41467a75d1c3e5fa973cc5eefc9fa /include/linux/vringh.h
parent0bbe30668d89ec8a309f28ced6d092c90fb23e8c (diff)
downloadlinux-9ad9c49cfe970b053bb0ef323b682dd1b4d4f8a0.tar.xz
vringh: IOTLB support
This patch implements the third memory accessor for vringh besides current kernel and userspace accessors. This idea is to allow vringh to do the address translation through an IOTLB which is implemented via vhost_map interval tree. Users should setup and IOVA to PA mapping in this IOTLB. This allows us to: - Use vringh to access virtqueues with vIOMMU - Use vringh to implement software virtqueues for vDPA devices Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200326140125.19794-5-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/linux/vringh.h')
-rw-r--r--include/linux/vringh.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/include/linux/vringh.h b/include/linux/vringh.h
index d237087eb257..bd0503ca6f8f 100644
--- a/include/linux/vringh.h
+++ b/include/linux/vringh.h
@@ -14,6 +14,8 @@
#include <linux/virtio_byteorder.h>
#include <linux/uio.h>
#include <linux/slab.h>
+#include <linux/dma-direction.h>
+#include <linux/vhost_iotlb.h>
#include <asm/barrier.h>
/* virtio_ring with information needed for host access. */
@@ -39,6 +41,9 @@ struct vringh {
/* The vring (note: it may contain user pointers!) */
struct vring vring;
+ /* IOTLB for this vring */
+ struct vhost_iotlb *iotlb;
+
/* The function to call to notify the guest about added buffers */
void (*notify)(struct vringh *);
};
@@ -248,4 +253,35 @@ static inline __virtio64 cpu_to_vringh64(const struct vringh *vrh, u64 val)
{
return __cpu_to_virtio64(vringh_is_little_endian(vrh), val);
}
+
+void vringh_set_iotlb(struct vringh *vrh, struct vhost_iotlb *iotlb);
+
+int vringh_init_iotlb(struct vringh *vrh, u64 features,
+ unsigned int num, bool weak_barriers,
+ struct vring_desc *desc,
+ struct vring_avail *avail,
+ struct vring_used *used);
+
+int vringh_getdesc_iotlb(struct vringh *vrh,
+ struct vringh_kiov *riov,
+ struct vringh_kiov *wiov,
+ u16 *head,
+ gfp_t gfp);
+
+ssize_t vringh_iov_pull_iotlb(struct vringh *vrh,
+ struct vringh_kiov *riov,
+ void *dst, size_t len);
+ssize_t vringh_iov_push_iotlb(struct vringh *vrh,
+ struct vringh_kiov *wiov,
+ const void *src, size_t len);
+
+void vringh_abandon_iotlb(struct vringh *vrh, unsigned int num);
+
+int vringh_complete_iotlb(struct vringh *vrh, u16 head, u32 len);
+
+bool vringh_notify_enable_iotlb(struct vringh *vrh);
+void vringh_notify_disable_iotlb(struct vringh *vrh);
+
+int vringh_need_notify_iotlb(struct vringh *vrh);
+
#endif /* _LINUX_VRINGH_H */