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_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);
}
void
viomb_attach(struct device *parent, struct device *self, void *aux)
{
struct viomb_softc *sc = (struct viomb_softc *)self;
struct virtio_softc *vsc = (struct virtio_softc *)parent;
u_int32_t features;
int i;
if (vsc->sc_child != NULL) {
printf("child already attached for %s; something wrong...\n",
parent->dv_xname);
return;
}
/* fail on non-4K page size archs */
if (VIRTIO_PAGE_SIZE != PAGE_SIZE){
printf("non-4K page size arch found, needs %d, got %d\n",
VIRTIO_PAGE_SIZE, PAGE_SIZE);
return;
}
sc->sc_virtio = vsc;
vsc->sc_vqs = &sc->sc_vq[VQ_INFLATE];
vsc->sc_nvqs = 0;
vsc->sc_child = self;
vsc->sc_ipl = IPL_BIO;
vsc->sc_config_change = viomb_config_change;
vsc->sc_intrhand = virtio_vq_intr;
/* negotiate features */
features = VIRTIO_F_RING_INDIRECT_DESC;
features = virtio_negotiate_features(vsc, features,
viomb_feature_names);
if ((virtio_alloc_vq(vsc, &sc->sc_vq[VQ_INFLATE], VQ_INFLATE,
sizeof(u_int32_t) * PGS_PER_REQ, 1, "inflate") != 0))
goto err;
vsc->sc_nvqs++;
if ((virtio_alloc_vq(vsc, &sc->sc_vq[VQ_DEFLATE], VQ_DEFLATE,
sizeof(u_int32_t) * PGS_PER_REQ, 1, "deflate") != 0))
goto err;
vsc->sc_nvqs++;
sc->sc_vq[VQ_INFLATE].vq_done = viomb_inflate_intr;
sc->sc_vq[VQ_DEFLATE].vq_done = viomb_deflate_intr;
virtio_start_vq_intr(vsc, &sc->sc_vq[VQ_INFLATE]);
virtio_start_vq_intr(vsc, &sc->sc_vq[VQ_DEFLATE]);
viomb_read_config(sc);
TAILQ_INIT(&sc->sc_balloon_pages);
if ((sc->sc_req.bl_pages = dma_alloc(sizeof(u_int32_t) * PGS_PER_REQ,
PR_NOWAIT|PR_ZERO)) == NULL) {
printf("%s: Can't alloc DMA memory.\n", DEVNAME(sc));
goto err;
}
if (bus_dmamap_create(vsc->sc_dmat, sizeof(u_int32_t) * PGS_PER_REQ,
1, sizeof(u_int32_t) * PGS_PER_REQ, 0,
BUS_DMA_NOWAIT, &sc->sc_req.bl_dmamap)) {
printf("%s: dmamap creation failed.\n", DEVNAME(sc));
goto err;
}
if (bus_dmamap_load(vsc->sc_dmat, sc->sc_req.bl_dmamap,
&sc->sc_req.bl_pages[0],
sizeof(uint32_t) * PGS_PER_REQ,
NULL, BUS_DMA_NOWAIT)) {
printf("%s: dmamap load failed.\n", DEVNAME(sc));
goto err_dmamap;
}
sc->sc_taskq = taskq_create("viomb", 1, IPL_BIO);
if (sc->sc_taskq == NULL)
goto err_dmamap;
task_set(&sc->sc_task, viomb_worker, sc, NULL);
printf("\n");
return;
err_dmamap:
bus_dmamap_destroy(vsc->sc_dmat, sc->sc_req.bl_dmamap);
err:
if (sc->sc_req.bl_pages)
dma_free(sc->sc_req.bl_pages, sizeof(u_int32_t) * PGS_PER_REQ);
for (i = 0; i < vsc->sc_nvqs; i++)
virtio_free_vq(vsc, &sc->sc_vq[i]);
vsc->sc_nvqs = 0;
vsc->sc_child = VIRTIO_CHILD_ERROR;
return;
}
