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// Virtio SCSI boot support.
//
// Copyright (C) 2012 Red Hat Inc.
//
// Authors:
// Paolo Bonzini <pbonzini@redhat.com>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // GET_GLOBALFLAT
#include "block.h" // struct drive_s
#include "blockcmd.h" // scsi_drive_setup
#include "config.h" // CONFIG_*
#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-scsi.h"
struct virtio_lun_s {
struct drive_s drive;
struct pci_device *pci;
struct vring_virtqueue *vq;
struct vp_device *vp;
u16 target;
u16 lun;
};
int
virtio_scsi_process_op(struct disk_op_s *op)
{
if (! CONFIG_VIRTIO_SCSI)
return 0;
struct virtio_lun_s *vlun =
container_of(op->drive_gf, struct virtio_lun_s, drive);
struct vp_device *vp = vlun->vp;
struct vring_virtqueue *vq = vlun->vq;
struct virtio_scsi_req_cmd req;
struct virtio_scsi_resp_cmd resp;
struct vring_list sg[3];
memset(&req, 0, sizeof(req));
int blocksize = scsi_fill_cmd(op, req.cdb, 16);
if (blocksize < 0)
return default_process_op(op);
req.lun[0] = 1;
req.lun[1] = vlun->target;
req.lun[2] = (vlun->lun >> 8) | 0x40;
req.lun[3] = (vlun->lun & 0xff);
u32 len = op->count * blocksize;
int datain = scsi_is_read(op);
int in_num = (datain ? 2 : 1);
int out_num = (len ? 3 : 2) - in_num;
sg[0].addr = (void*)(&req);
sg[0].length = sizeof(req);
sg[out_num].addr = (void*)(&resp);
sg[out_num].length = sizeof(resp);
if (len) {
int data_idx = (datain ? 2 : 1);
sg[data_idx].addr = op->buf_fl;
sg[data_idx].length = len;
}
/* Add to virtqueue and kick host */
vring_add_buf(vq, sg, out_num, in_num, 0, 0);
vring_kick(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(vp);
if (resp.response == VIRTIO_SCSI_S_OK && resp.status == 0) {
return DISK_RET_SUCCESS;
}
return DISK_RET_EBADTRACK;
}
static int
virtio_scsi_add_lun(struct pci_device *pci, struct vp_device *vp,
struct vring_virtqueue *vq, u16 target, u16 lun)
{
struct virtio_lun_s *vlun = malloc_fseg(sizeof(*vlun));
if (!vlun) {
warn_noalloc();
return -1;
}
memset(vlun, 0, sizeof(*vlun));
vlun->drive.type = DTYPE_VIRTIO_SCSI;
vlun->drive.cntl_id = pci->bdf;
vlun->pci = pci;
vlun->vp = vp;
vlun->vq = vq;
vlun->target = target;
vlun->lun = lun;
int prio = bootprio_find_scsi_device(pci, target, lun);
int ret = scsi_drive_setup(&vlun->drive, "virtio-scsi", prio);
if (ret)
goto fail;
return 0;
fail:
free(vlun);
return -1;
}
static int
virtio_scsi_scan_target(struct pci_device *pci, struct vp_device *vp,
struct vring_virtqueue *vq, u16 target)
{
/* TODO: send REPORT LUNS. For now, only LUN 0 is recognized. */
int ret = virtio_scsi_add_lun(pci, vp, vq, target, 0);
return ret < 0 ? 0 : 1;
}
static void
init_virtio_scsi(struct pci_device *pci)
{
u16 bdf = pci->bdf;
dprintf(1, "found virtio-scsi at %x:%x\n", pci_bdf_to_bus(bdf),
pci_bdf_to_dev(bdf));
struct vring_virtqueue *vq = NULL;
struct vp_device *vp = malloc_high(sizeof(*vp));
if (!vp) {
warn_noalloc();
return;
}
vp_init_simple(vp, pci);
u8 status = VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER;
if (vp->use_modern) {
u64 features = vp_get_features(vp);
u64 version1 = 1ull << VIRTIO_F_VERSION_1;
if (!(features & version1)) {
dprintf(1, "modern device without virtio_1 feature bit: %x:%x\n",
pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
goto fail;
}
vp_set_features(vp, version1);
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: %x:%x\n",
pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
goto fail;
}
}
if (vp_find_vq(vp, 2, &vq) < 0 ) {
dprintf(1, "fail to find vq for virtio-scsi %x:%x\n",
pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
goto fail;
}
status |= VIRTIO_CONFIG_S_DRIVER_OK;
vp_set_status(vp, status);
int i, tot;
for (tot = 0, i = 0; i < 256; i++)
tot += virtio_scsi_scan_target(pci, vp, vq, i);
if (!tot)
goto fail;
return;
fail:
vp_reset(vp);
free(vp);
free(vq);
}
void
virtio_scsi_setup(void)
{
ASSERT32FLAT();
if (! CONFIG_VIRTIO_SCSI)
return;
dprintf(3, "init virtio-scsi\n");
struct pci_device *pci;
foreachpci(pci) {
if (pci->vendor != PCI_VENDOR_ID_REDHAT_QUMRANET ||
(pci->device != PCI_DEVICE_ID_VIRTIO_SCSI_09 &&
pci->device != PCI_DEVICE_ID_VIRTIO_SCSI_10))
continue;
init_virtio_scsi(pci);
}
}
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