C++ (Cpp) virtio_free_vq Examples

Example #1

File: ld_virtio.c Project: ryo/netbsd-src

static int
ld_virtio_detach(device_t self, int flags)
{
	struct ld_virtio_softc *sc = device_private(self);
	struct ld_softc *ld = &sc->sc_ld;
	bus_dma_tag_t dmat = sc->sc_virtio->sc_dmat;
	int r, i, qsize;

	qsize = sc->sc_vq.vq_num;
	r = ldbegindetach(ld, flags);
	if (r != 0)
		return r;
	virtio_reset(sc->sc_virtio);
	virtio_free_vq(sc->sc_virtio, &sc->sc_vq);

	for (i = 0; i < qsize; i++) {
		bus_dmamap_destroy(dmat,
				   sc->sc_reqs[i].vr_cmdsts);
		bus_dmamap_destroy(dmat,
				   sc->sc_reqs[i].vr_payload);
	}
	bus_dmamem_unmap(dmat, sc->sc_reqs,
			 sizeof(struct virtio_blk_req) * qsize);
	bus_dmamem_free(dmat, &sc->sc_reqs_seg, 1);

	ldenddetach(ld);

	return 0;
}

Example #2

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;
}