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// Virtio block boot support.
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// Copyright (C) 2010 Red Hat Inc.
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// Gleb Natapov <gnatapov@redhat.com>
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#include "util.h" // dprintf
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#include "pci.h" // foreachpci
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#include "config.h" // CONFIG_*
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#include "biosvar.h" // GET_GLOBAL
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#include "pci_ids.h" // PCI_DEVICE_ID_VIRTIO_BLK
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#include "pci_regs.h" // PCI_VENDOR_ID
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#include "boot.h" // add_bcv_internal
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#include "virtio-pci.h"
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#include "virtio-ring.h"
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#include "virtio-blk.h"
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struct virtiodrive_s {
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struct vring_virtqueue *vq;
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virtio_blk_read(struct disk_op_s *op)
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struct virtiodrive_s *vdrive_g =
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container_of(op->drive_g, struct virtiodrive_s, drive);
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struct vring_virtqueue *vq = GET_GLOBAL(vdrive_g->vq);
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struct virtio_blk_outhdr hdr = {
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.type = VIRTIO_BLK_T_IN,
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u8 status = VIRTIO_BLK_S_UNSUPP;
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struct vring_list sg[] = {
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.addr = MAKE_FLATPTR(GET_SEG(SS), &hdr),
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.length = sizeof(hdr),
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.length = GET_GLOBAL(vdrive_g->drive.blksize) * op->count,
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.addr = MAKE_FLATPTR(GET_SEG(SS), &status),
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.length = sizeof(status),
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/* Add to virtqueue and kick host */
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vring_add_buf(vq, sg, 1, 2, 0, 0);
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vring_kick(GET_GLOBAL(vdrive_g->ioaddr), vq, 1);
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while (!vring_more_used(vq))
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/* Reclaim virtqueue element */
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vring_get_buf(vq, NULL);
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return status == VIRTIO_BLK_S_OK ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK;
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process_virtio_op(struct disk_op_s *op)
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switch (op->command) {
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return virtio_blk_read(op);
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return DISK_RET_EWRITEPROTECT;
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return DISK_RET_SUCCESS;
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return DISK_RET_EPARAM;
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virtio_blk_setup(void)
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if (! CONFIG_VIRTIO_BLK)
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dprintf(3, "init virtio-blk\n");
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u32 id = PCI_VENDOR_ID_REDHAT_QUMRANET | (PCI_DEVICE_ID_VIRTIO_BLK << 16);
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foreachpci(bdf, max) {
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u32 v = pci_config_readl(bdf, PCI_VENDOR_ID);
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dprintf(3, "found virtio-blk at %x:%x\n", pci_bdf_to_bus(bdf),
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pci_bdf_to_dev(bdf));
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char *desc = malloc_tmphigh(MAXDESCSIZE);
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struct virtiodrive_s *vdrive_g = malloc_fseg(sizeof(*vdrive_g));
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struct vring_virtqueue *vq = memalign_low(PAGE_SIZE, sizeof(*vq));
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if (!vdrive_g || !desc || !vq) {
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memset(vdrive_g, 0, sizeof(*vdrive_g));
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vdrive_g->drive.type = DTYPE_VIRTIO;
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vdrive_g->drive.cntl_id = bdf;
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u16 ioaddr = pci_config_readl(bdf, PCI_BASE_ADDRESS_0) &
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PCI_BASE_ADDRESS_IO_MASK;
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vdrive_g->ioaddr = ioaddr;
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vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
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VIRTIO_CONFIG_S_DRIVER );
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if (vp_find_vq(ioaddr, 0, vdrive_g->vq) < 0 ) {
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dprintf(1, "fail to find vq for virtio-blk %x:%x\n",
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pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
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struct virtio_blk_config cfg;
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vp_get(ioaddr, 0, &cfg, sizeof(cfg));
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u32 f = vp_get_features(ioaddr);
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vdrive_g->drive.blksize = (f & (1 << VIRTIO_BLK_F_BLK_SIZE)) ?
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cfg.blk_size : DISK_SECTOR_SIZE;
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vdrive_g->drive.sectors = cfg.capacity;
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dprintf(3, "virtio-blk %x:%x blksize=%d sectors=%u\n",
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pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
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vdrive_g->drive.blksize, (u32)vdrive_g->drive.sectors);
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if (vdrive_g->drive.blksize != DISK_SECTOR_SIZE) {
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dprintf(1, "virtio-blk %x:%x block size %d is unsupported\n",
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pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
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vdrive_g->drive.blksize);
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vdrive_g->drive.pchs.cylinders = cfg.cylinders;
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vdrive_g->drive.pchs.heads = cfg.heads;
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vdrive_g->drive.pchs.spt = cfg.sectors;
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setup_translation(&vdrive_g->drive);
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add_bcv_internal(&vdrive_g->drive);
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snprintf(desc, MAXDESCSIZE, "Virtio disk PCI:%x:%x",
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pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
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vdrive_g->drive.desc = desc;
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vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
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VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK);