static int
ld_virtio_start(struct ld_softc *ld, struct buf *bp)
{
/* splbio */
struct ld_virtio_softc *sc = device_private(ld->sc_dv);
struct virtio_softc *vsc = sc->sc_virtio;
struct virtqueue *vq = &sc->sc_vq[0];
struct virtio_blk_req *vr;
int r;
int isread = (bp->b_flags & B_READ);
int slot;
if (sc->sc_readonly && !isread)
return EIO;
r = virtio_enqueue_prep(vsc, vq, &slot);
if (r != 0)
return r;
vr = &sc->sc_reqs[slot];
r = bus_dmamap_load(vsc->sc_dmat, vr->vr_payload,
bp->b_data, bp->b_bcount, NULL,
((isread?BUS_DMA_READ:BUS_DMA_WRITE)
|BUS_DMA_NOWAIT));
if (r != 0)
return r;
r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + 2);
if (r != 0) {
bus_dmamap_unload(vsc->sc_dmat, vr->vr_payload);
return r;
}
vr->vr_bp = bp;
vr->vr_hdr.type = isread?VIRTIO_BLK_T_IN:VIRTIO_BLK_T_OUT;
vr->vr_hdr.ioprio = 0;
vr->vr_hdr.sector = bp->b_rawblkno * sc->sc_ld.sc_secsize / 512;
bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts,
0, sizeof(struct virtio_blk_req_hdr),
BUS_DMASYNC_PREWRITE);
bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload,
0, bp->b_bcount,
isread?BUS_DMASYNC_PREREAD:BUS_DMASYNC_PREWRITE);
bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts,
offsetof(struct virtio_blk_req, vr_status),
sizeof(uint8_t),
BUS_DMASYNC_PREREAD);
virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts,
0, sizeof(struct virtio_blk_req_hdr),
true);
virtio_enqueue(vsc, vq, slot, vr->vr_payload, !isread);
virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts,
offsetof(struct virtio_blk_req, vr_status),
sizeof(uint8_t),
false);
virtio_enqueue_commit(vsc, vq, slot, true);
return 0;
}
void
viomb_deflate(struct viomb_softc *sc)
{
struct virtio_softc *vsc = (struct virtio_softc *)sc->sc_virtio;
struct balloon_req *b;
struct vm_page *p;
struct virtqueue *vq = &sc->sc_vq[VQ_DEFLATE];
u_int64_t nvpages;
int i, slot;
nvpages = sc->sc_actual - sc->sc_npages;
if (nvpages > PGS_PER_REQ)
nvpages = PGS_PER_REQ;
b = &sc->sc_req;
b->bl_nentries = nvpages;
TAILQ_INIT(&b->bl_pglist);
for (i = 0; i < nvpages; i++) {
p = TAILQ_FIRST(&sc->sc_balloon_pages);
if (p == NULL){
b->bl_nentries = i - 1;
break;
}
TAILQ_REMOVE(&sc->sc_balloon_pages, p, pageq);
TAILQ_INSERT_TAIL(&b->bl_pglist, p, pageq);
b->bl_pages[i] = p->phys_addr / VIRTIO_PAGE_SIZE;
}
if (virtio_enqueue_prep(vq, &slot)) {
printf("%s:virtio_get_slot(def) vq_num %d\n",
DEVNAME(sc), vq->vq_num);
goto err;
}
if (virtio_enqueue_reserve(vq, slot, 1)) {
printf("%s:virtio_enqueue_reserve() vq_num %d\n",
DEVNAME(sc), vq->vq_num);
goto err;
}
bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages,
BUS_DMASYNC_PREWRITE);
virtio_enqueue_p(vq, slot, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages, VRING_READ);
if (!(vsc->sc_features & VIRTIO_BALLOON_F_MUST_TELL_HOST))
uvm_pglistfree(&b->bl_pglist);
virtio_enqueue_commit(vsc, vq, slot, VRING_NOTIFY);
return;
err:
while ((p = TAILQ_LAST(&b->bl_pglist, pglist))) {
TAILQ_REMOVE(&b->bl_pglist, p, pageq);
TAILQ_INSERT_HEAD(&sc->sc_balloon_pages, p, pageq);
}
return;
}
void
vioconstart(struct tty *tp)
{
struct viocon_softc *sc = dev2sc(tp->t_dev);
struct virtio_softc *vsc;
struct viocon_port *vp = dev2port(tp->t_dev);
struct virtqueue *vq;
u_char *buf;
int s, cnt, slot, ret, ndone;
vsc = sc->sc_virtio;
vq = vp->vp_tx;
s = spltty();
ndone = viocon_tx_drain(vp, vq);
if (ISSET(tp->t_state, TS_BUSY)) {
if (ndone > 0)
CLR(tp->t_state, TS_BUSY);
else
goto out;
}
if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP))
goto out;
if (tp->t_outq.c_cc == 0)
goto out;
ndone = 0;
while (tp->t_outq.c_cc > 0) {
ret = virtio_enqueue_prep(vq, &slot);
if (ret == EAGAIN)
break;
KASSERT(ret == 0);
ret = virtio_enqueue_reserve(vq, slot, 1);
KASSERT(ret == 0);
buf = vp->vp_tx_buf + slot * BUFSIZE;
cnt = q_to_b(&tp->t_outq, buf, BUFSIZE);
bus_dmamap_sync(vsc->sc_dmat, vp->vp_dmamap,
vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, cnt,
BUS_DMASYNC_PREWRITE);
virtio_enqueue_p(vq, slot, vp->vp_dmamap,
vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, cnt, 1);
virtio_enqueue_commit(vsc, vq, slot, 0);
ndone++;
}
if (ret == EAGAIN)
SET(tp->t_state, TS_BUSY);
if (ndone > 0)
virtio_notify(vsc, vq);
ttwakeupwr(tp);
out:
splx(s);
}
void
viomb_inflate(struct viomb_softc *sc)
{
struct virtio_softc *vsc = (struct virtio_softc *)sc->sc_virtio;
struct balloon_req *b;
struct vm_page *p;
struct virtqueue *vq = &sc->sc_vq[VQ_INFLATE];
u_int32_t nvpages;
int slot, error, i = 0;
nvpages = sc->sc_npages - sc->sc_actual;
if (nvpages > PGS_PER_REQ)
nvpages = PGS_PER_REQ;
b = &sc->sc_req;
if ((error = uvm_pglistalloc(nvpages * PAGE_SIZE, 0,
dma_constraint.ucr_high,
0, 0, &b->bl_pglist, nvpages,
UVM_PLA_NOWAIT))) {
printf("%s unable to allocate %u physmem pages,"
"error %d\n", DEVNAME(sc), nvpages, error);
return;
}
b->bl_nentries = nvpages;
TAILQ_FOREACH(p, &b->bl_pglist, pageq)
b->bl_pages[i++] = p->phys_addr / VIRTIO_PAGE_SIZE;
KASSERT(i == nvpages);
if ((virtio_enqueue_prep(vq, &slot)) > 0) {
printf("%s:virtio_enqueue_prep() vq_num %d\n",
DEVNAME(sc), vq->vq_num);
goto err;
}
if (virtio_enqueue_reserve(vq, slot, 1)) {
printf("%s:virtio_enqueue_reserve vq_num %d\n",
DEVNAME(sc), vq->vq_num);
goto err;
}
bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages, BUS_DMASYNC_PREWRITE);
virtio_enqueue_p(vq, slot, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages, VRING_READ);
virtio_enqueue_commit(vsc, vq, slot, VRING_NOTIFY);
return;
err:
uvm_pglistfree(&b->bl_pglist);
return;
}
void
viocon_rx_fill(struct viocon_port *vp)
{
struct virtqueue *vq = vp->vp_rx;
struct virtio_softc *vsc = vp->vp_sc->sc_virtio;
int r, slot, ndone = 0;
while ((r = virtio_enqueue_prep(vq, &slot)) == 0) {
if (virtio_enqueue_reserve(vq, slot, 1) != 0)
break;
bus_dmamap_sync(vsc->sc_dmat, vp->vp_dmamap, slot * BUFSIZE,
BUFSIZE, BUS_DMASYNC_PREREAD);
virtio_enqueue_p(vq, slot, vp->vp_dmamap, slot * BUFSIZE,
BUFSIZE, 0);
virtio_enqueue_commit(vsc, vq, slot, 0);
ndone++;
}
KASSERT(r == 0 || r == EAGAIN);
if (ndone > 0)
virtio_notify(vsc, vq);
}
static int
ld_virtio_dump(struct ld_softc *ld, void *data, int blkno, int blkcnt)
{
struct ld_virtio_softc *sc = device_private(ld->sc_dv);
struct virtio_softc *vsc = sc->sc_virtio;
struct virtqueue *vq = &sc->sc_vq;
struct virtio_blk_req *vr;
int slot, r;
if (sc->sc_readonly)
return EIO;
r = virtio_enqueue_prep(vsc, vq, &slot);
if (r != 0) {
if (r == EAGAIN) { /* no free slot; dequeue first */
delay(100);
ld_virtio_vq_done(vq);
r = virtio_enqueue_prep(vsc, vq, &slot);
if (r != 0)
return r;
}
return r;
}
vr = &sc->sc_reqs[slot];
r = bus_dmamap_load(vsc->sc_dmat, vr->vr_payload,
data, blkcnt*ld->sc_secsize, NULL,
BUS_DMA_WRITE|BUS_DMA_NOWAIT);
if (r != 0)
return r;
r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs +
VIRTIO_BLK_MIN_SEGMENTS);
if (r != 0) {
bus_dmamap_unload(vsc->sc_dmat, vr->vr_payload);
return r;
}
vr->vr_bp = (void*)0xdeadbeef;
vr->vr_hdr.type = VIRTIO_BLK_T_OUT;
vr->vr_hdr.ioprio = 0;
vr->vr_hdr.sector = (daddr_t) blkno * ld->sc_secsize / 512;
bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts,
0, sizeof(struct virtio_blk_req_hdr),
BUS_DMASYNC_PREWRITE);
bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload,
0, blkcnt*ld->sc_secsize,
BUS_DMASYNC_PREWRITE);
bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts,
offsetof(struct virtio_blk_req, vr_status),
sizeof(uint8_t),
BUS_DMASYNC_PREREAD);
virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts,
0, sizeof(struct virtio_blk_req_hdr),
true);
virtio_enqueue(vsc, vq, slot, vr->vr_payload, true);
virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts,
offsetof(struct virtio_blk_req, vr_status),
sizeof(uint8_t),
false);
virtio_enqueue_commit(vsc, vq, slot, true);
for ( ; ; ) {
int dslot;
r = virtio_dequeue(vsc, vq, &dslot, NULL);
if (r != 0)
continue;
if (dslot != slot) {
ld_virtio_vq_done1(sc, vsc, vq, dslot);
continue;
} else
break;
}
bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts,
0, sizeof(struct virtio_blk_req_hdr),
BUS_DMASYNC_POSTWRITE);
bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload,
0, blkcnt*ld->sc_secsize,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts,
offsetof(struct virtio_blk_req, vr_status),
sizeof(uint8_t),
BUS_DMASYNC_POSTREAD);
if (vr->vr_status == VIRTIO_BLK_S_OK)
r = 0;
else
r = EIO;
virtio_dequeue_commit(vsc, vq, slot);
return r;
}