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Current Path : /lib/modules/3.10.0-1160.92.1.el7.x86_64/build/include/linux/

Linux 43-225-53-84.webhostbox.net 3.10.0-1160.92.1.el7.x86_64 #1 SMP Tue Jun 20 11:48:01 UTC 2023 x86_64

Current File : //lib/modules/3.10.0-1160.92.1.el7.x86_64/build/include/linux/virtio_ring.h

#ifndef _LINUX_VIRTIO_RING_H
#define _LINUX_VIRTIO_RING_H

#include <linux/irqreturn.h>
#include <uapi/linux/virtio_ring.h>

/*
 * Barriers in virtio are tricky.  Non-SMP virtio guests can't assume
 * they're not on an SMP host system, so they need to assume real
 * barriers.  Non-SMP virtio hosts could skip the barriers, but does
 * anyone care?
 *
 * For virtio_pci on SMP, we don't need to order with respect to MMIO
 * accesses through relaxed memory I/O windows, so smp_mb() et al are
 * sufficient.
 *
 * For using virtio to talk to real devices (eg. other heterogeneous
 * CPUs) we do need real barriers.  In theory, we could be using both
 * kinds of virtio, so it's a runtime decision, and the branch is
 * actually quite cheap.
 */

static inline void virtio_mb(bool weak_barriers)
{
#ifdef CONFIG_SMP
	if (weak_barriers)
		smp_mb();
	else
#endif
		mb();
}

static inline void virtio_rmb(bool weak_barriers)
{
	if (weak_barriers)
		dma_rmb();
	else
		rmb();
}

static inline void virtio_wmb(bool weak_barriers)
{
	if (weak_barriers)
		dma_wmb();
	else
		wmb();
}

struct virtio_device;
struct virtqueue;

/*
 * Creates a virtqueue and allocates the descriptor ring.  If
 * may_reduce_num is set, then this may allocate a smaller ring than
 * expected.  The caller should query virtqueue_get_vring_size to learn
 * the actual size of the ring.
 */
struct virtqueue *vring_create_virtqueue(unsigned int index,
					 unsigned int num,
					 unsigned int vring_align,
					 struct virtio_device *vdev,
					 bool weak_barriers,
					 bool may_reduce_num,
					 bool (*notify)(struct virtqueue *vq),
					 void (*callback)(struct virtqueue *vq),
					 const char *name);

/* Creates a virtqueue with a custom layout. */
struct virtqueue *__vring_new_virtqueue(unsigned int index,
					struct vring vring,
					struct virtio_device *vdev,
					bool weak_barriers,
					bool (*notify)(struct virtqueue *),
					void (*callback)(struct virtqueue *),
					const char *name);

/*
 * Creates a virtqueue with a standard layout but a caller-allocated
 * ring.
 */
struct virtqueue *vring_new_virtqueue(unsigned int index,
				      unsigned int num,
				      unsigned int vring_align,
				      struct virtio_device *vdev,
				      bool weak_barriers,
				      void *pages,
				      bool (*notify)(struct virtqueue *vq),
				      void (*callback)(struct virtqueue *vq),
				      const char *name);

/*
 * Destroys a virtqueue.  If created with vring_create_virtqueue, this
 * also frees the ring.
 */
void vring_del_virtqueue(struct virtqueue *vq);

/* Filter out transport-specific feature bits. */
void vring_transport_features(struct virtio_device *vdev);

irqreturn_t vring_interrupt(int irq, void *_vq);
#endif /* _LINUX_VIRTIO_RING_H */

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