int
viomb_deflate_intr(struct virtqueue *vq)
{
struct virtio_softc *vsc = vq->vq_owner;
struct viomb_softc *sc = (struct viomb_softc *)vsc->sc_child;
struct balloon_req *b;
u_int64_t nvpages;
if (viomb_vq_dequeue(vq))
return(1);
b = &sc->sc_req;
nvpages = b->bl_nentries;
bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages,
BUS_DMASYNC_POSTWRITE);
if (vsc->sc_features & VIRTIO_BALLOON_F_MUST_TELL_HOST)
uvm_pglistfree(&b->bl_pglist);
VIOMBDEBUG(sc, "updating sc->sc_actual from %u to %llu\n",
sc->sc_actual, sc->sc_actual - nvpages);
virtio_write_device_config_4(vsc, VIRTIO_BALLOON_CONFIG_ACTUAL,
sc->sc_actual - nvpages);
viomb_read_config(sc);
/* if we have more work to do, add it to tasks list */
if (sc->sc_npages < sc->sc_actual)
task_add(sc->sc_taskq, &sc->sc_task);
return(1);
}
/*
* interrupt handling for vq's
*/
int
viomb_inflate_intr(struct virtqueue *vq)
{
struct virtio_softc *vsc = vq->vq_owner;
struct viomb_softc *sc = (struct viomb_softc *)vsc->sc_child;
struct balloon_req *b;
struct vm_page *p;
u_int64_t nvpages;
if (viomb_vq_dequeue(vq))
return(1);
b = &sc->sc_req;
nvpages = b->bl_nentries;
bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages,
BUS_DMASYNC_POSTWRITE);
while (!TAILQ_EMPTY(&b->bl_pglist)) {
p = TAILQ_FIRST(&b->bl_pglist);
TAILQ_REMOVE(&b->bl_pglist, p, pageq);
TAILQ_INSERT_TAIL(&sc->sc_balloon_pages, p, pageq);
}
VIOMBDEBUG(sc, "updating sc->sc_actual from %u to %llu\n",
sc->sc_actual, sc->sc_actual + nvpages);
virtio_write_device_config_4(vsc, VIRTIO_BALLOON_CONFIG_ACTUAL,
sc->sc_actual + nvpages);
viomb_read_config(sc);
/* if we have more work to do, add it to the task list */
if (sc->sc_npages > sc->sc_actual)
task_add(sc->sc_taskq, &sc->sc_task);
return (1);
}
void
viomb_worker(void *arg1, void *arg2)
{
struct viomb_softc *sc = (struct viomb_softc *)arg1;
int s;
s = splbio();
viomb_read_config(sc);
if (sc->sc_npages > sc->sc_actual){
VIOMBDEBUG(sc, "inflating balloon from %u to %u.\n",
sc->sc_actual, sc->sc_npages);
viomb_inflate(sc);
}
else if (sc->sc_npages < sc->sc_actual){
viomb_deflate(sc);
VIOMBDEBUG(sc, "deflating balloon from %u to %u.\n",
sc->sc_actual, sc->sc_npages);
}
splx(s);
}
void
viomb_read_config(struct viomb_softc *sc)
{
struct virtio_softc *vsc = (struct virtio_softc *)sc->sc_virtio;
u_int32_t reg;
/* these values are explicitly specified as little-endian */
reg = virtio_read_device_config_4(vsc, VIRTIO_BALLOON_CONFIG_NUM_PAGES);
sc->sc_npages = letoh32(reg);
reg = virtio_read_device_config_4(vsc, VIRTIO_BALLOON_CONFIG_ACTUAL);
sc->sc_actual = letoh32(reg);
VIOMBDEBUG(sc, "sc->sc_npages %u, sc->sc_actual %u\n",
sc->sc_npages, sc->sc_actual);
}
void
viomb_worker(void *arg1)
{
struct viomb_softc *sc = (struct viomb_softc *)arg1;
int s;
s = splbio();
viomb_read_config(sc);
if (sc->sc_npages > sc->sc_actual) {
VIOMBDEBUG(sc, "inflating balloon from %u to %u.\n",
sc->sc_actual, sc->sc_npages);
viomb_inflate(sc);
}
else if (sc->sc_npages < sc->sc_actual) {
VIOMBDEBUG(sc, "deflating balloon from %u to %u.\n",
sc->sc_actual, sc->sc_npages);
viomb_deflate(sc);
}
sc->sc_sens[0].value = sc->sc_npages << PAGE_SHIFT;
sc->sc_sens[1].value = sc->sc_actual << PAGE_SHIFT;
splx(s);
}