virtio-pci.c File Reference

#include "etherboot.h"
#include "gpxe/io.h"
#include "gpxe/virtio-ring.h"
#include "gpxe/virtio-pci.h"

Go to the source code of this file.

Functions
int	vp_find_vq (unsigned int ioaddr, int queue_index, struct vring_virtqueue *vq)

---

Function Documentation

int vp_find_vq	(	unsigned int	ioaddr,
		int	queue_index,
		struct vring_virtqueue *	vq
	)

Definition at line 19 of file virtio-pci.c.

References vring::desc, inl, inw, MAX_QUEUE_NUM, vring::num, outl, outw, PAGE_SHIFT, printf(), vring_virtqueue::queue, vring_virtqueue::queue_index, u16, virt_to_phys(), VIRTIO_PCI_QUEUE_NUM, VIRTIO_PCI_QUEUE_PFN, VIRTIO_PCI_QUEUE_SEL, vring_virtqueue::vring, and vring_init().

Referenced by virtnet_probe().

{
   struct vring * vr = &vq->vring;
   u16 num;

   /* select the queue */

   outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL);

   /* check if the queue is available */

   num = inw(ioaddr + VIRTIO_PCI_QUEUE_NUM);
   if (!num) {
           printf("ERROR: queue size is 0\n");
           return -1;
   }

   if (num > MAX_QUEUE_NUM) {
           printf("ERROR: queue size %d > %d\n", num, MAX_QUEUE_NUM);
           return -1;
   }

   /* check if the queue is already active */

   if (inl(ioaddr + VIRTIO_PCI_QUEUE_PFN)) {
           printf("ERROR: queue already active\n");
           return -1;
   }

   vq->queue_index = queue_index;

   /* initialize the queue */

   vring_init(vr, num, (unsigned char*)&vq->queue);

   /* activate the queue
    *
    * NOTE: vr->desc is initialized by vring_init()
    */

   outl((unsigned long)virt_to_phys(vr->desc) >> PAGE_SHIFT,
        ioaddr + VIRTIO_PCI_QUEUE_PFN);

   return num;
}