1 // Virtio block boot support.
3 // Copyright (C) 2010 Red Hat Inc.
6 // Gleb Natapov <gnatapov@redhat.com>
8 // This file may be distributed under the terms of the GNU LGPLv3 license.
10 #include "util.h" // dprintf
11 #include "pci.h" // foreachpci
12 #include "config.h" // CONFIG_*
13 #include "biosvar.h" // GET_GLOBAL
14 #include "pci_ids.h" // PCI_DEVICE_ID_VIRTIO_BLK
15 #include "pci_regs.h" // PCI_VENDOR_ID
16 #include "boot.h" // boot_add_hd
17 #include "virtio-pci.h"
18 #include "virtio-ring.h"
19 #include "virtio-blk.h"
22 struct virtiodrive_s {
24 struct vring_virtqueue *vq;
29 virtio_blk_op(struct disk_op_s *op, int write)
31 struct virtiodrive_s *vdrive_g =
32 container_of(op->drive_g, struct virtiodrive_s, drive);
33 struct vring_virtqueue *vq = GET_GLOBAL(vdrive_g->vq);
34 struct virtio_blk_outhdr hdr = {
35 .type = write ? VIRTIO_BLK_T_OUT : VIRTIO_BLK_T_IN,
39 u8 status = VIRTIO_BLK_S_UNSUPP;
40 struct vring_list sg[] = {
42 .addr = MAKE_FLATPTR(GET_SEG(SS), &hdr),
43 .length = sizeof(hdr),
47 .length = GET_GLOBAL(vdrive_g->drive.blksize) * op->count,
50 .addr = MAKE_FLATPTR(GET_SEG(SS), &status),
51 .length = sizeof(status),
55 /* Add to virtqueue and kick host */
57 vring_add_buf(vq, sg, 2, 1, 0, 0);
59 vring_add_buf(vq, sg, 1, 2, 0, 0);
60 vring_kick(GET_GLOBAL(vdrive_g->ioaddr), vq, 1);
63 while (!vring_more_used(vq))
66 /* Reclaim virtqueue element */
67 vring_get_buf(vq, NULL);
69 /* Clear interrupt status register. Avoid leaving interrupts stuck if
70 * VRING_AVAIL_F_NO_INTERRUPT was ignored and interrupts were raised.
72 vp_get_isr(GET_GLOBAL(vdrive_g->ioaddr));
74 return status == VIRTIO_BLK_S_OK ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK;
78 process_virtio_blk_op(struct disk_op_s *op)
80 if (! CONFIG_VIRTIO_BLK || CONFIG_COREBOOT)
82 switch (op->command) {
84 return virtio_blk_op(op, 0);
86 return virtio_blk_op(op, 1);
92 return DISK_RET_SUCCESS;
95 return DISK_RET_EPARAM;
100 init_virtio_blk(struct pci_device *pci)
103 dprintf(1, "found virtio-blk at %x:%x\n", pci_bdf_to_bus(bdf),
104 pci_bdf_to_dev(bdf));
105 struct virtiodrive_s *vdrive_g = malloc_fseg(sizeof(*vdrive_g));
110 memset(vdrive_g, 0, sizeof(*vdrive_g));
111 vdrive_g->drive.type = DTYPE_VIRTIO_BLK;
112 vdrive_g->drive.cntl_id = bdf;
114 u16 ioaddr = vp_init_simple(bdf);
115 vdrive_g->ioaddr = ioaddr;
116 if (vp_find_vq(ioaddr, 0, &vdrive_g->vq) < 0 ) {
117 dprintf(1, "fail to find vq for virtio-blk %x:%x\n",
118 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
122 struct virtio_blk_config cfg;
123 vp_get(ioaddr, 0, &cfg, sizeof(cfg));
125 u32 f = vp_get_features(ioaddr);
126 vdrive_g->drive.blksize = (f & (1 << VIRTIO_BLK_F_BLK_SIZE)) ?
127 cfg.blk_size : DISK_SECTOR_SIZE;
129 vdrive_g->drive.sectors = cfg.capacity;
130 dprintf(3, "virtio-blk %x:%x blksize=%d sectors=%u\n",
131 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
132 vdrive_g->drive.blksize, (u32)vdrive_g->drive.sectors);
134 if (vdrive_g->drive.blksize != DISK_SECTOR_SIZE) {
135 dprintf(1, "virtio-blk %x:%x block size %d is unsupported\n",
136 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
137 vdrive_g->drive.blksize);
141 vdrive_g->drive.pchs.cylinders = cfg.cylinders;
142 vdrive_g->drive.pchs.heads = cfg.heads;
143 vdrive_g->drive.pchs.spt = cfg.sectors;
144 char *desc = znprintf(MAXDESCSIZE, "Virtio disk PCI:%x:%x",
145 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
147 boot_add_hd(&vdrive_g->drive, desc, bootprio_find_pci_device(pci));
149 vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
150 VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK);
159 virtio_blk_setup(void)
162 if (! CONFIG_VIRTIO_BLK || CONFIG_COREBOOT)
165 dprintf(3, "init virtio-blk\n");
167 struct pci_device *pci;
169 if (pci->vendor != PCI_VENDOR_ID_REDHAT_QUMRANET
170 || pci->device != PCI_DEVICE_ID_VIRTIO_BLK)
172 init_virtio_blk(pci);