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// Virtio block boot support.
//
// Copyright (C) 2010 Red Hat Inc.
//
// Authors:
// Gleb Natapov <gnatapov@redhat.com>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // GET_GLOBALFLAT
#include "config.h" // CONFIG_*
#include "block.h" // struct drive_s
#include "malloc.h" // free
#include "output.h" // dprintf
#include "pci.h" // foreachpci
#include "pci_ids.h" // PCI_DEVICE_ID_VIRTIO_BLK
#include "pci_regs.h" // PCI_VENDOR_ID
#include "std/disk.h" // DISK_RET_SUCCESS
#include "string.h" // memset
#include "util.h" // usleep
#include "virtio-pci.h"
#include "virtio-ring.h"
#include "virtio-blk.h"
struct virtiodrive_s {
struct drive_s drive;
struct vring_virtqueue *vq;
struct vp_device vp;
};
static int
virtio_blk_op(struct disk_op_s *op, int write)
{
struct virtiodrive_s *vdrive_gf =
container_of(op->drive_gf, struct virtiodrive_s, drive);
struct vring_virtqueue *vq = vdrive_gf->vq;
struct virtio_blk_outhdr hdr = {
.type = write ? VIRTIO_BLK_T_OUT : VIRTIO_BLK_T_IN,
.ioprio = 0,
.sector = op->lba,
};
u8 status = VIRTIO_BLK_S_UNSUPP;
struct vring_list sg[] = {
{
.addr = (void*)(&hdr),
.length = sizeof(hdr),
},
{
.addr = op->buf_fl,
.length = vdrive_gf->drive.blksize * op->count,
},
{
.addr = (void*)(&status),
.length = sizeof(status),
},
};
/* Add to virtqueue and kick host */
if (write)
vring_add_buf(vq, sg, 2, 1, 0, 0);
else
vring_add_buf(vq, sg, 1, 2, 0, 0);
vring_kick(&vdrive_gf->vp, vq, 1);
/* Wait for reply */
while (!vring_more_used(vq))
usleep(5);
/* Reclaim virtqueue element */
vring_get_buf(vq, NULL);
/* Clear interrupt status register. Avoid leaving interrupts stuck if
* VRING_AVAIL_F_NO_INTERRUPT was ignored and interrupts were raised.
*/
vp_get_isr(&vdrive_gf->vp);
return status == VIRTIO_BLK_S_OK ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK;
}
int
virtio_blk_process_op(struct disk_op_s *op)
{
if (! CONFIG_VIRTIO_BLK)
return 0;
switch (op->command) {
case CMD_READ:
return virtio_blk_op(op, 0);
case CMD_WRITE:
return virtio_blk_op(op, 1);
default:
return default_process_op(op);
}
}
static void
init_virtio_blk(struct pci_device *pci)
{
u8 status = VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER;
dprintf(1, "found virtio-blk at %pP\n", pci);
struct virtiodrive_s *vdrive = malloc_fseg(sizeof(*vdrive));
if (!vdrive) {
warn_noalloc();
return;
}
memset(vdrive, 0, sizeof(*vdrive));
vdrive->drive.type = DTYPE_VIRTIO_BLK;
vdrive->drive.cntl_id = pci->bdf;
vp_init_simple(&vdrive->vp, pci);
if (vp_find_vq(&vdrive->vp, 0, &vdrive->vq) < 0 ) {
dprintf(1, "fail to find vq for virtio-blk %pP\n", pci);
goto fail;
}
if (vdrive->vp.use_modern) {
struct vp_device *vp = &vdrive->vp;
u64 features = vp_get_features(vp);
u64 version1 = 1ull << VIRTIO_F_VERSION_1;
u64 blk_size = 1ull << VIRTIO_BLK_F_BLK_SIZE;
if (!(features & version1)) {
dprintf(1, "modern device without virtio_1 feature bit: %pP\n", pci);
goto fail;
}
features = features & (version1 | blk_size);
vp_set_features(vp, features);
status |= VIRTIO_CONFIG_S_FEATURES_OK;
vp_set_status(vp, status);
if (!(vp_get_status(vp) & VIRTIO_CONFIG_S_FEATURES_OK)) {
dprintf(1, "device didn't accept features: %pP\n", pci);
goto fail;
}
vdrive->drive.sectors =
vp_read(&vp->device, struct virtio_blk_config, capacity);
if (features & blk_size) {
vdrive->drive.blksize =
vp_read(&vp->device, struct virtio_blk_config, blk_size);
} else {
vdrive->drive.blksize = DISK_SECTOR_SIZE;
}
if (vdrive->drive.blksize != DISK_SECTOR_SIZE) {
dprintf(1, "virtio-blk %pP block size %d is unsupported\n",
pci, vdrive->drive.blksize);
goto fail;
}
dprintf(3, "virtio-blk %pP blksize=%d sectors=%u\n",
pci, vdrive->drive.blksize, (u32)vdrive->drive.sectors);
vdrive->drive.pchs.cylinder =
vp_read(&vp->device, struct virtio_blk_config, cylinders);
vdrive->drive.pchs.head =
vp_read(&vp->device, struct virtio_blk_config, heads);
vdrive->drive.pchs.sector =
vp_read(&vp->device, struct virtio_blk_config, sectors);
} else {
struct virtio_blk_config cfg;
vp_get_legacy(&vdrive->vp, 0, &cfg, sizeof(cfg));
u64 f = vp_get_features(&vdrive->vp);
vdrive->drive.blksize = (f & (1 << VIRTIO_BLK_F_BLK_SIZE)) ?
cfg.blk_size : DISK_SECTOR_SIZE;
vdrive->drive.sectors = cfg.capacity;
dprintf(3, "virtio-blk %pP blksize=%d sectors=%u\n",
pci, vdrive->drive.blksize, (u32)vdrive->drive.sectors);
if (vdrive->drive.blksize != DISK_SECTOR_SIZE) {
dprintf(1, "virtio-blk %pP block size %d is unsupported\n",
pci, vdrive->drive.blksize);
goto fail;
}
vdrive->drive.pchs.cylinder = cfg.cylinders;
vdrive->drive.pchs.head = cfg.heads;
vdrive->drive.pchs.sector = cfg.sectors;
}
char *desc = znprintf(MAXDESCSIZE, "Virtio disk PCI:%pP", pci);
boot_add_hd(&vdrive->drive, desc, bootprio_find_pci_device(pci));
status |= VIRTIO_CONFIG_S_DRIVER_OK;
vp_set_status(&vdrive->vp, status);
return;
fail:
vp_reset(&vdrive->vp);
free(vdrive->vq);
free(vdrive);
}
void
virtio_blk_setup(void)
{
ASSERT32FLAT();
if (! CONFIG_VIRTIO_BLK)
return;
dprintf(3, "init virtio-blk\n");
struct pci_device *pci;
foreachpci(pci) {
if (pci->vendor != PCI_VENDOR_ID_REDHAT_QUMRANET ||
(pci->device != PCI_DEVICE_ID_VIRTIO_BLK_09 &&
pci->device != PCI_DEVICE_ID_VIRTIO_BLK_10))
continue;
init_virtio_blk(pci);
}
}
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