blob: 6a1646303893b2b8cd52173562462e21feb02322 [file] [log] [blame]
/* virtio-pci.c - pci interface for virtio interface
*
* (c) Copyright 2008 Bull S.A.S.
*
* Author: Laurent Vivier <Laurent.Vivier@bull.net>
*
* some parts from Linux Virtio PCI driver
*
* Copyright IBM Corp. 2007
* Authors: Anthony Liguori <aliguori@us.ibm.com>
*
* Adopted for Seabios: Gleb Natapov <gleb@redhat.com>
*
* This work is licensed under the terms of the GNU LGPLv3
* See the COPYING file in the top-level directory.
*/
#include "virtio-ring.h"
#include "virtio-pci.h"
#include "config.h" // CONFIG_DEBUG_LEVEL
#include "util.h" // dprintf
#include "pci.h" // pci_config_readl
#include "pci_regs.h" // PCI_BASE_ADDRESS_0
#include "string.h" // memset
int vp_find_vq(unsigned int ioaddr, int queue_index,
struct vring_virtqueue **p_vq)
{
u16 num;
ASSERT32FLAT();
struct vring_virtqueue *vq = *p_vq = memalign_low(PAGE_SIZE, sizeof(*vq));
if (!vq) {
warn_noalloc();
goto fail;
}
memset(vq, 0, sizeof(*vq));
/* 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) {
dprintf(1, "ERROR: queue size is 0\n");
goto fail;
}
if (num > MAX_QUEUE_NUM) {
dprintf(1, "ERROR: queue size %d > %d\n", num, MAX_QUEUE_NUM);
goto fail;
}
/* check if the queue is already active */
if (inl(ioaddr + VIRTIO_PCI_QUEUE_PFN)) {
dprintf(1, "ERROR: queue already active\n");
goto fail;
}
vq->queue_index = queue_index;
/* initialize the queue */
struct vring * vr = &vq->vring;
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;
fail:
free(vq);
*p_vq = NULL;
return -1;
}
u16 vp_init_simple(u16 bdf)
{
u16 ioaddr = pci_config_readl(bdf, PCI_BASE_ADDRESS_0) &
PCI_BASE_ADDRESS_IO_MASK;
vp_reset(ioaddr);
vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
VIRTIO_CONFIG_S_DRIVER );
return ioaddr;
}