diff options
Diffstat (limited to 'sys/dev/hyperv/vmbus/vmbus_chan.c')
| -rw-r--r-- | sys/dev/hyperv/vmbus/vmbus_chan.c | 1380 |
1 files changed, 1380 insertions, 0 deletions
diff --git a/sys/dev/hyperv/vmbus/vmbus_chan.c b/sys/dev/hyperv/vmbus/vmbus_chan.c new file mode 100644 index 0000000..feb8044 --- /dev/null +++ b/sys/dev/hyperv/vmbus/vmbus_chan.c @@ -0,0 +1,1380 @@ +/*- + * Copyright (c) 2009-2012,2016 Microsoft Corp. + * Copyright (c) 2012 NetApp Inc. + * Copyright (c) 2012 Citrix Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice unmodified, this list of conditions, and the following + * disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/sysctl.h> + +#include <machine/atomic.h> +#include <machine/bus.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/pmap.h> + +#include <dev/hyperv/include/hyperv_busdma.h> +#include <dev/hyperv/vmbus/hv_vmbus_priv.h> +#include <dev/hyperv/vmbus/hyperv_var.h> +#include <dev/hyperv/vmbus/vmbus_reg.h> +#include <dev/hyperv/vmbus/vmbus_var.h> + +static void vmbus_chan_signal_tx(struct hv_vmbus_channel *chan); +static void vmbus_chan_update_evtflagcnt(struct vmbus_softc *, + const struct hv_vmbus_channel *); + +static void vmbus_chan_task(void *, int); +static void vmbus_chan_task_nobatch(void *, int); +static void vmbus_chan_detach_task(void *, int); + +static void vmbus_chan_msgproc_choffer(struct vmbus_softc *, + const struct vmbus_message *); +static void vmbus_chan_msgproc_chrescind(struct vmbus_softc *, + const struct vmbus_message *); + +/* + * Vmbus channel message processing. + */ +static const vmbus_chanmsg_proc_t +vmbus_chan_msgprocs[VMBUS_CHANMSG_TYPE_MAX] = { + VMBUS_CHANMSG_PROC(CHOFFER, vmbus_chan_msgproc_choffer), + VMBUS_CHANMSG_PROC(CHRESCIND, vmbus_chan_msgproc_chrescind), + + VMBUS_CHANMSG_PROC_WAKEUP(CHOPEN_RESP), + VMBUS_CHANMSG_PROC_WAKEUP(GPADL_CONNRESP), + VMBUS_CHANMSG_PROC_WAKEUP(GPADL_DISCONNRESP) +}; + +/** + * @brief Trigger an event notification on the specified channel + */ +static void +vmbus_chan_signal_tx(struct hv_vmbus_channel *chan) +{ + struct vmbus_softc *sc = chan->vmbus_sc; + uint32_t chanid = chan->ch_id; + + atomic_set_long(&sc->vmbus_tx_evtflags[chanid >> VMBUS_EVTFLAG_SHIFT], + 1UL << (chanid & VMBUS_EVTFLAG_MASK)); + + if (chan->ch_flags & VMBUS_CHAN_FLAG_HASMNF) { + atomic_set_int( + &sc->vmbus_mnf2->mnf_trigs[chan->ch_montrig_idx].mt_pending, + chan->ch_montrig_mask); + } else { + hypercall_signal_event(chan->ch_monprm_dma.hv_paddr); + } +} + +static int +vmbus_chan_sysctl_mnf(SYSCTL_HANDLER_ARGS) +{ + struct hv_vmbus_channel *chan = arg1; + int mnf = 0; + + if (chan->ch_flags & VMBUS_CHAN_FLAG_HASMNF) + mnf = 1; + return sysctl_handle_int(oidp, &mnf, 0, req); +} + +static void +vmbus_chan_sysctl_create(struct hv_vmbus_channel *chan) +{ + struct sysctl_oid *ch_tree, *chid_tree, *br_tree; + struct sysctl_ctx_list *ctx; + uint32_t ch_id; + char name[16]; + + /* + * Add sysctl nodes related to this channel to this + * channel's sysctl ctx, so that they can be destroyed + * independently upon close of this channel, which can + * happen even if the device is not detached. + */ + ctx = &chan->ch_sysctl_ctx; + sysctl_ctx_init(ctx); + + /* + * Create dev.NAME.UNIT.channel tree. + */ + ch_tree = SYSCTL_ADD_NODE(ctx, + SYSCTL_CHILDREN(device_get_sysctl_tree(chan->ch_dev)), + OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); + if (ch_tree == NULL) + return; + + /* + * Create dev.NAME.UNIT.channel.CHANID tree. + */ + if (VMBUS_CHAN_ISPRIMARY(chan)) + ch_id = chan->ch_id; + else + ch_id = chan->ch_prichan->ch_id; + snprintf(name, sizeof(name), "%d", ch_id); + chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree), + OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); + if (chid_tree == NULL) + return; + + if (!VMBUS_CHAN_ISPRIMARY(chan)) { + /* + * Create dev.NAME.UNIT.channel.CHANID.sub tree. + */ + ch_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), + OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); + if (ch_tree == NULL) + return; + + /* + * Create dev.NAME.UNIT.channel.CHANID.sub.SUBIDX tree. + * + * NOTE: + * chid_tree is changed to this new sysctl tree. + */ + snprintf(name, sizeof(name), "%d", chan->ch_subidx); + chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree), + OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); + if (chid_tree == NULL) + return; + + SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, + "chanid", CTLFLAG_RD, &chan->ch_id, 0, "channel id"); + } + + SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, + "cpu", CTLFLAG_RD, &chan->ch_cpuid, 0, "owner CPU id"); + SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, + "mnf", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, + chan, 0, vmbus_chan_sysctl_mnf, "I", + "has monitor notification facilities"); + + /* + * Create sysctl tree for RX bufring. + */ + br_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, + "in", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); + if (br_tree != NULL) { + hv_ring_buffer_stat(ctx, SYSCTL_CHILDREN(br_tree), + &chan->inbound, "inbound ring buffer stats"); + } + + /* + * Create sysctl tree for TX bufring. + */ + br_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, + "out", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); + if (br_tree != NULL) { + hv_ring_buffer_stat(ctx, SYSCTL_CHILDREN(br_tree), + &chan->outbound, "outbound ring buffer stats"); + } +} + +int +vmbus_chan_open(struct hv_vmbus_channel *chan, int txbr_size, int rxbr_size, + const void *udata, int udlen, vmbus_chan_callback_t cb, void *cbarg) +{ + struct vmbus_softc *sc = chan->vmbus_sc; + const struct vmbus_chanmsg_chopen_resp *resp; + const struct vmbus_message *msg; + struct vmbus_chanmsg_chopen *req; + struct vmbus_msghc *mh; + uint32_t status; + int error; + uint8_t *br; + + if (udlen > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) { + device_printf(sc->vmbus_dev, + "invalid udata len %d for chan%u\n", udlen, chan->ch_id); + return EINVAL; + } + KASSERT((txbr_size & PAGE_MASK) == 0, + ("send bufring size is not multiple page")); + KASSERT((rxbr_size & PAGE_MASK) == 0, + ("recv bufring size is not multiple page")); + + if (atomic_testandset_int(&chan->ch_stflags, + VMBUS_CHAN_ST_OPENED_SHIFT)) + panic("double-open chan%u", chan->ch_id); + + chan->ch_cb = cb; + chan->ch_cbarg = cbarg; + + vmbus_chan_update_evtflagcnt(sc, chan); + + chan->ch_tq = VMBUS_PCPU_GET(chan->vmbus_sc, event_tq, chan->ch_cpuid); + if (chan->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) + TASK_INIT(&chan->ch_task, 0, vmbus_chan_task, chan); + else + TASK_INIT(&chan->ch_task, 0, vmbus_chan_task_nobatch, chan); + + /* + * Allocate the TX+RX bufrings. + * XXX should use ch_dev dtag + */ + br = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev), + PAGE_SIZE, 0, txbr_size + rxbr_size, &chan->ch_bufring_dma, + BUS_DMA_WAITOK | BUS_DMA_ZERO); + if (br == NULL) { + device_printf(sc->vmbus_dev, "bufring allocation failed\n"); + error = ENOMEM; + goto failed; + } + chan->ch_bufring = br; + + /* TX bufring comes first */ + hv_vmbus_ring_buffer_init(&chan->outbound, br, txbr_size); + /* RX bufring immediately follows TX bufring */ + hv_vmbus_ring_buffer_init(&chan->inbound, br + txbr_size, rxbr_size); + + /* Create sysctl tree for this channel */ + vmbus_chan_sysctl_create(chan); + + /* + * Connect the bufrings, both RX and TX, to this channel. + */ + error = vmbus_chan_gpadl_connect(chan, chan->ch_bufring_dma.hv_paddr, + txbr_size + rxbr_size, &chan->ch_bufring_gpadl); + if (error) { + device_printf(sc->vmbus_dev, + "failed to connect bufring GPADL to chan%u\n", chan->ch_id); + goto failed; + } + + /* + * Open channel w/ the bufring GPADL on the target CPU. + */ + mh = vmbus_msghc_get(sc, sizeof(*req)); + if (mh == NULL) { + device_printf(sc->vmbus_dev, + "can not get msg hypercall for chopen(chan%u)\n", + chan->ch_id); + error = ENXIO; + goto failed; + } + + req = vmbus_msghc_dataptr(mh); + req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN; + req->chm_chanid = chan->ch_id; + req->chm_openid = chan->ch_id; + req->chm_gpadl = chan->ch_bufring_gpadl; + req->chm_vcpuid = chan->ch_vcpuid; + req->chm_txbr_pgcnt = txbr_size >> PAGE_SHIFT; + if (udlen > 0) + memcpy(req->chm_udata, udata, udlen); + + error = vmbus_msghc_exec(sc, mh); + if (error) { + device_printf(sc->vmbus_dev, + "chopen(chan%u) msg hypercall exec failed: %d\n", + chan->ch_id, error); + vmbus_msghc_put(sc, mh); + goto failed; + } + + msg = vmbus_msghc_wait_result(sc, mh); + resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data; + status = resp->chm_status; + + vmbus_msghc_put(sc, mh); + + if (status == 0) { + if (bootverbose) { + device_printf(sc->vmbus_dev, "chan%u opened\n", + chan->ch_id); + } + return 0; + } + + device_printf(sc->vmbus_dev, "failed to open chan%u\n", chan->ch_id); + error = ENXIO; + +failed: + if (chan->ch_bufring_gpadl) { + vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl); + chan->ch_bufring_gpadl = 0; + } + if (chan->ch_bufring != NULL) { + hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring); + chan->ch_bufring = NULL; + } + atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED); + return error; +} + +int +vmbus_chan_gpadl_connect(struct hv_vmbus_channel *chan, bus_addr_t paddr, + int size, uint32_t *gpadl0) +{ + struct vmbus_softc *sc = chan->vmbus_sc; + struct vmbus_msghc *mh; + struct vmbus_chanmsg_gpadl_conn *req; + const struct vmbus_message *msg; + size_t reqsz; + uint32_t gpadl, status; + int page_count, range_len, i, cnt, error; + uint64_t page_id; + + /* + * Preliminary checks. + */ + + KASSERT((size & PAGE_MASK) == 0, + ("invalid GPA size %d, not multiple page size", size)); + page_count = size >> PAGE_SHIFT; + + KASSERT((paddr & PAGE_MASK) == 0, + ("GPA is not page aligned %jx", (uintmax_t)paddr)); + page_id = paddr >> PAGE_SHIFT; + + range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); + /* + * We don't support multiple GPA ranges. + */ + if (range_len > UINT16_MAX) { + device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", + page_count); + return EOPNOTSUPP; + } + + /* + * Allocate GPADL id. + */ + gpadl = vmbus_gpadl_alloc(sc); + *gpadl0 = gpadl; + + /* + * Connect this GPADL to the target channel. + * + * NOTE: + * Since each message can only hold small set of page + * addresses, several messages may be required to + * complete the connection. + */ + if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) + cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; + else + cnt = page_count; + page_count -= cnt; + + reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, + chm_range.gpa_page[cnt]); + mh = vmbus_msghc_get(sc, reqsz); + if (mh == NULL) { + device_printf(sc->vmbus_dev, + "can not get msg hypercall for gpadl->chan%u\n", + chan->ch_id); + return EIO; + } + + req = vmbus_msghc_dataptr(mh); + req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN; + req->chm_chanid = chan->ch_id; + req->chm_gpadl = gpadl; + req->chm_range_len = range_len; + req->chm_range_cnt = 1; + req->chm_range.gpa_len = size; + req->chm_range.gpa_ofs = 0; + for (i = 0; i < cnt; ++i) + req->chm_range.gpa_page[i] = page_id++; + + error = vmbus_msghc_exec(sc, mh); + if (error) { + device_printf(sc->vmbus_dev, + "gpadl->chan%u msg hypercall exec failed: %d\n", + chan->ch_id, error); + vmbus_msghc_put(sc, mh); + return error; + } + + while (page_count > 0) { + struct vmbus_chanmsg_gpadl_subconn *subreq; + + if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) + cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; + else + cnt = page_count; + page_count -= cnt; + + reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, + chm_gpa_page[cnt]); + vmbus_msghc_reset(mh, reqsz); + + subreq = vmbus_msghc_dataptr(mh); + subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN; + subreq->chm_gpadl = gpadl; + for (i = 0; i < cnt; ++i) + subreq->chm_gpa_page[i] = page_id++; + + vmbus_msghc_exec_noresult(mh); + } + KASSERT(page_count == 0, ("invalid page count %d", page_count)); + + msg = vmbus_msghc_wait_result(sc, mh); + status = ((const struct vmbus_chanmsg_gpadl_connresp *) + msg->msg_data)->chm_status; + + vmbus_msghc_put(sc, mh); + + if (status != 0) { + device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " + "status %u\n", chan->ch_id, status); + return EIO; + } else { + if (bootverbose) { + device_printf(sc->vmbus_dev, "gpadl->chan%u " + "succeeded\n", chan->ch_id); + } + } + return 0; +} + +/* + * Disconnect the GPA from the target channel + */ +int +vmbus_chan_gpadl_disconnect(struct hv_vmbus_channel *chan, uint32_t gpadl) +{ + struct vmbus_softc *sc = chan->vmbus_sc; + struct vmbus_msghc *mh; + struct vmbus_chanmsg_gpadl_disconn *req; + int error; + + mh = vmbus_msghc_get(sc, sizeof(*req)); + if (mh == NULL) { + device_printf(sc->vmbus_dev, + "can not get msg hypercall for gpa x->chan%u\n", + chan->ch_id); + return EBUSY; + } + + req = vmbus_msghc_dataptr(mh); + req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN; + req->chm_chanid = chan->ch_id; + req->chm_gpadl = gpadl; + + error = vmbus_msghc_exec(sc, mh); + if (error) { + device_printf(sc->vmbus_dev, + "gpa x->chan%u msg hypercall exec failed: %d\n", + chan->ch_id, error); + vmbus_msghc_put(sc, mh); + return error; + } + + vmbus_msghc_wait_result(sc, mh); + /* Discard result; no useful information */ + vmbus_msghc_put(sc, mh); + + return 0; +} + +static void +vmbus_chan_close_internal(struct hv_vmbus_channel *chan) +{ + struct vmbus_softc *sc = chan->vmbus_sc; + struct vmbus_msghc *mh; + struct vmbus_chanmsg_chclose *req; + struct taskqueue *tq = chan->ch_tq; + int error; + + /* TODO: stringent check */ + atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED); + + /* + * Free this channel's sysctl tree attached to its device's + * sysctl tree. + */ + sysctl_ctx_free(&chan->ch_sysctl_ctx); + + /* + * Set ch_tq to NULL to avoid more requests be scheduled. + * XXX pretty broken; need rework. + */ + chan->ch_tq = NULL; + taskqueue_drain(tq, &chan->ch_task); + chan->ch_cb = NULL; + + /* + * Close this channel. + */ + mh = vmbus_msghc_get(sc, sizeof(*req)); + if (mh == NULL) { + device_printf(sc->vmbus_dev, + "can not get msg hypercall for chclose(chan%u)\n", + chan->ch_id); + return; + } + + req = vmbus_msghc_dataptr(mh); + req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; + req->chm_chanid = chan->ch_id; + + error = vmbus_msghc_exec_noresult(mh); + vmbus_msghc_put(sc, mh); + + if (error) { + device_printf(sc->vmbus_dev, + "chclose(chan%u) msg hypercall exec failed: %d\n", + chan->ch_id, error); + return; + } else if (bootverbose) { + device_printf(sc->vmbus_dev, "close chan%u\n", chan->ch_id); + } + + /* + * Disconnect the TX+RX bufrings from this channel. + */ + if (chan->ch_bufring_gpadl) { + vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl); + chan->ch_bufring_gpadl = 0; + } + + /* + * Destroy the TX+RX bufrings. + */ + hv_ring_buffer_cleanup(&chan->outbound); + hv_ring_buffer_cleanup(&chan->inbound); + if (chan->ch_bufring != NULL) { + hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring); + chan->ch_bufring = NULL; + } +} + +/* + * Caller should make sure that all sub-channels have + * been added to 'chan' and all to-be-closed channels + * are not being opened. + */ +void +vmbus_chan_close(struct hv_vmbus_channel *chan) +{ + int subchan_cnt; + + if (!VMBUS_CHAN_ISPRIMARY(chan)) { + /* + * Sub-channel is closed when its primary channel + * is closed; done. + */ + return; + } + + /* + * Close all sub-channels, if any. + */ + subchan_cnt = chan->ch_subchan_cnt; + if (subchan_cnt > 0) { + struct hv_vmbus_channel **subchan; + int i; + + subchan = vmbus_subchan_get(chan, subchan_cnt); + for (i = 0; i < subchan_cnt; ++i) + vmbus_chan_close_internal(subchan[i]); + vmbus_subchan_rel(subchan, subchan_cnt); + } + + /* Then close the primary channel. */ + vmbus_chan_close_internal(chan); +} + +int +vmbus_chan_send(struct hv_vmbus_channel *chan, uint16_t type, uint16_t flags, + void *data, int dlen, uint64_t xactid) +{ + struct vmbus_chanpkt pkt; + int pktlen, pad_pktlen, hlen, error; + uint64_t pad = 0; + struct iovec iov[3]; + boolean_t send_evt; + + hlen = sizeof(pkt); + pktlen = hlen + dlen; + pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); + + pkt.cp_hdr.cph_type = type; + pkt.cp_hdr.cph_flags = flags; + VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); + VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); + pkt.cp_hdr.cph_xactid = xactid; + + iov[0].iov_base = &pkt; + iov[0].iov_len = hlen; + iov[1].iov_base = data; + iov[1].iov_len = dlen; + iov[2].iov_base = &pad; + iov[2].iov_len = pad_pktlen - pktlen; + + error = hv_ring_buffer_write(&chan->outbound, iov, 3, &send_evt); + if (!error && send_evt) + vmbus_chan_signal_tx(chan); + return error; +} + +int +vmbus_chan_send_sglist(struct hv_vmbus_channel *chan, + struct vmbus_gpa sg[], int sglen, void *data, int dlen, uint64_t xactid) +{ + struct vmbus_chanpkt_sglist pkt; + int pktlen, pad_pktlen, hlen, error; + struct iovec iov[4]; + boolean_t send_evt; + uint64_t pad = 0; + + KASSERT(sglen < VMBUS_CHAN_SGLIST_MAX, + ("invalid sglist len %d", sglen)); + + hlen = __offsetof(struct vmbus_chanpkt_sglist, cp_gpa[sglen]); + pktlen = hlen + dlen; + pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); + + pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; + pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; + VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); + VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); + pkt.cp_hdr.cph_xactid = xactid; + pkt.cp_rsvd = 0; + pkt.cp_gpa_cnt = sglen; + + iov[0].iov_base = &pkt; + iov[0].iov_len = sizeof(pkt); + iov[1].iov_base = sg; + iov[1].iov_len = sizeof(struct vmbus_gpa) * sglen; + iov[2].iov_base = data; + iov[2].iov_len = dlen; + iov[3].iov_base = &pad; + iov[3].iov_len = pad_pktlen - pktlen; + + error = hv_ring_buffer_write(&chan->outbound, iov, 4, &send_evt); + if (!error && send_evt) + vmbus_chan_signal_tx(chan); + return error; +} + +int +vmbus_chan_send_prplist(struct hv_vmbus_channel *chan, + struct vmbus_gpa_range *prp, int prp_cnt, void *data, int dlen, + uint64_t xactid) +{ + struct vmbus_chanpkt_prplist pkt; + int pktlen, pad_pktlen, hlen, error; + struct iovec iov[4]; + boolean_t send_evt; + uint64_t pad = 0; + + KASSERT(prp_cnt < VMBUS_CHAN_PRPLIST_MAX, + ("invalid prplist entry count %d", prp_cnt)); + + hlen = __offsetof(struct vmbus_chanpkt_prplist, + cp_range[0].gpa_page[prp_cnt]); + pktlen = hlen + dlen; + pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); + + pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; + pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; + VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); + VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); + pkt.cp_hdr.cph_xactid = xactid; + pkt.cp_rsvd = 0; + pkt.cp_range_cnt = 1; + + iov[0].iov_base = &pkt; + iov[0].iov_len = sizeof(pkt); + iov[1].iov_base = prp; + iov[1].iov_len = __offsetof(struct vmbus_gpa_range, gpa_page[prp_cnt]); + iov[2].iov_base = data; + iov[2].iov_len = dlen; + iov[3].iov_base = &pad; + iov[3].iov_len = pad_pktlen - pktlen; + + error = hv_ring_buffer_write(&chan->outbound, iov, 4, &send_evt); + if (!error && send_evt) + vmbus_chan_signal_tx(chan); + return error; +} + +int +vmbus_chan_recv(struct hv_vmbus_channel *chan, void *data, int *dlen0, + uint64_t *xactid) +{ + struct vmbus_chanpkt_hdr pkt; + int error, dlen, hlen; + + error = hv_ring_buffer_peek(&chan->inbound, &pkt, sizeof(pkt)); + if (error) + return error; + + hlen = VMBUS_CHANPKT_GETLEN(pkt.cph_hlen); + dlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen) - hlen; + + if (*dlen0 < dlen) { + /* Return the size of this packet's data. */ + *dlen0 = dlen; + return ENOBUFS; + } + + *xactid = pkt.cph_xactid; + *dlen0 = dlen; + + /* Skip packet header */ + error = hv_ring_buffer_read(&chan->inbound, data, dlen, hlen); + KASSERT(!error, ("hv_ring_buffer_read failed")); + + return 0; +} + +int +vmbus_chan_recv_pkt(struct hv_vmbus_channel *chan, + struct vmbus_chanpkt_hdr *pkt0, int *pktlen0) +{ + struct vmbus_chanpkt_hdr pkt; + int error, pktlen; + + error = hv_ring_buffer_peek(&chan->inbound, &pkt, sizeof(pkt)); + if (error) + return error; + + pktlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen); + if (*pktlen0 < pktlen) { + /* Return the size of this packet. */ + *pktlen0 = pktlen; + return ENOBUFS; + } + *pktlen0 = pktlen; + + /* Include packet header */ + error = hv_ring_buffer_read(&chan->inbound, pkt0, pktlen, 0); + KASSERT(!error, ("hv_ring_buffer_read failed")); + + return 0; +} + +static void +vmbus_chan_task(void *xchan, int pending __unused) +{ + struct hv_vmbus_channel *chan = xchan; + vmbus_chan_callback_t cb = chan->ch_cb; + void *cbarg = chan->ch_cbarg; + + /* + * Optimize host to guest signaling by ensuring: + * 1. While reading the channel, we disable interrupts from + * host. + * 2. Ensure that we process all posted messages from the host + * before returning from this callback. + * 3. Once we return, enable signaling from the host. Once this + * state is set we check to see if additional packets are + * available to read. In this case we repeat the process. + * + * NOTE: Interrupt has been disabled in the ISR. + */ + for (;;) { + uint32_t left; + + cb(cbarg); + + left = hv_ring_buffer_read_end(&chan->inbound); + if (left == 0) { + /* No more data in RX bufring; done */ + break; + } + hv_ring_buffer_read_begin(&chan->inbound); + } +} + +static void +vmbus_chan_task_nobatch(void *xchan, int pending __unused) +{ + struct hv_vmbus_channel *chan = xchan; + + chan->ch_cb(chan->ch_cbarg); +} + +static __inline void +vmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags, + int flag_cnt) +{ + int f; + + for (f = 0; f < flag_cnt; ++f) { + uint32_t chid_base; + u_long flags; + int chid_ofs; + + if (event_flags[f] == 0) + continue; + + flags = atomic_swap_long(&event_flags[f], 0); + chid_base = f << VMBUS_EVTFLAG_SHIFT; + + while ((chid_ofs = ffsl(flags)) != 0) { + struct hv_vmbus_channel *chan; + + --chid_ofs; /* NOTE: ffsl is 1-based */ + flags &= ~(1UL << chid_ofs); + + chan = sc->vmbus_chmap[chid_base + chid_ofs]; + + /* if channel is closed or closing */ + if (chan == NULL || chan->ch_tq == NULL) + continue; + + if (chan->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) + hv_ring_buffer_read_begin(&chan->inbound); + taskqueue_enqueue(chan->ch_tq, &chan->ch_task); + } + } +} + +void +vmbus_event_proc(struct vmbus_softc *sc, int cpu) +{ + struct vmbus_evtflags *eventf; + + /* + * On Host with Win8 or above, the event page can be checked directly + * to get the id of the channel that has the pending interrupt. + */ + eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; + vmbus_event_flags_proc(sc, eventf->evt_flags, + VMBUS_PCPU_GET(sc, event_flags_cnt, cpu)); +} + +void +vmbus_event_proc_compat(struct vmbus_softc *sc, int cpu) +{ + struct vmbus_evtflags *eventf; + + eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; + if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) { + vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags, + VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT); + } +} + +static void +vmbus_chan_update_evtflagcnt(struct vmbus_softc *sc, + const struct hv_vmbus_channel *chan) +{ + volatile int *flag_cnt_ptr; + int flag_cnt; + + flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1; + flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->ch_cpuid); + + for (;;) { + int old_flag_cnt; + + old_flag_cnt = *flag_cnt_ptr; + if (old_flag_cnt >= flag_cnt) + break; + if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) { + if (bootverbose) { + device_printf(sc->vmbus_dev, + "channel%u update cpu%d flag_cnt to %d\n", + chan->ch_id, chan->ch_cpuid, flag_cnt); + } + break; + } + } +} + +static struct hv_vmbus_channel * +vmbus_chan_alloc(struct vmbus_softc *sc) +{ + struct hv_vmbus_channel *chan; + + chan = malloc(sizeof(*chan), M_DEVBUF, M_WAITOK | M_ZERO); + + chan->ch_monprm = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev), + HYPERCALL_PARAM_ALIGN, 0, sizeof(struct hyperv_mon_param), + &chan->ch_monprm_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); + if (chan->ch_monprm == NULL) { + device_printf(sc->vmbus_dev, "monprm alloc failed\n"); + free(chan, M_DEVBUF); + return NULL; + } + + chan->vmbus_sc = sc; + mtx_init(&chan->ch_subchan_lock, "vmbus subchan", NULL, MTX_DEF); + TAILQ_INIT(&chan->ch_subchans); + TASK_INIT(&chan->ch_detach_task, 0, vmbus_chan_detach_task, chan); + + return chan; +} + +static void +vmbus_chan_free(struct hv_vmbus_channel *chan) +{ + /* TODO: assert sub-channel list is empty */ + /* TODO: asset no longer on the primary channel's sub-channel list */ + /* TODO: asset no longer on the vmbus channel list */ + hyperv_dmamem_free(&chan->ch_monprm_dma, chan->ch_monprm); + mtx_destroy(&chan->ch_subchan_lock); + free(chan, M_DEVBUF); +} + +static int +vmbus_chan_add(struct hv_vmbus_channel *newchan) +{ + struct vmbus_softc *sc = newchan->vmbus_sc; + struct hv_vmbus_channel *prichan; + + if (newchan->ch_id == 0) { + /* + * XXX + * Chan0 will neither be processed nor should be offered; + * skip it. + */ + device_printf(sc->vmbus_dev, "got chan0 offer, discard\n"); + return EINVAL; + } else if (newchan->ch_id >= VMBUS_CHAN_MAX) { + device_printf(sc->vmbus_dev, "invalid chan%u offer\n", + newchan->ch_id); + return EINVAL; + } + sc->vmbus_chmap[newchan->ch_id] = newchan; + + if (bootverbose) { + device_printf(sc->vmbus_dev, "chan%u subidx%u offer\n", + newchan->ch_id, newchan->ch_subidx); + } + + mtx_lock(&sc->vmbus_prichan_lock); + TAILQ_FOREACH(prichan, &sc->vmbus_prichans, ch_prilink) { + /* + * Sub-channel will have the same type GUID and instance + * GUID as its primary channel. + */ + if (memcmp(&prichan->ch_guid_type, &newchan->ch_guid_type, + sizeof(struct hyperv_guid)) == 0 && + memcmp(&prichan->ch_guid_inst, &newchan->ch_guid_inst, + sizeof(struct hyperv_guid)) == 0) + break; + } + if (VMBUS_CHAN_ISPRIMARY(newchan)) { + if (prichan == NULL) { + /* Install the new primary channel */ + TAILQ_INSERT_TAIL(&sc->vmbus_prichans, newchan, + ch_prilink); + mtx_unlock(&sc->vmbus_prichan_lock); + return 0; + } else { + mtx_unlock(&sc->vmbus_prichan_lock); + device_printf(sc->vmbus_dev, "duplicated primary " + "chan%u\n", newchan->ch_id); + return EINVAL; + } + } else { /* Sub-channel */ + if (prichan == NULL) { + mtx_unlock(&sc->vmbus_prichan_lock); + device_printf(sc->vmbus_dev, "no primary chan for " + "chan%u\n", newchan->ch_id); + return EINVAL; + } + /* + * Found the primary channel for this sub-channel and + * move on. + * + * XXX refcnt prichan + */ + } + mtx_unlock(&sc->vmbus_prichan_lock); + + /* + * This is a sub-channel; link it with the primary channel. + */ + KASSERT(!VMBUS_CHAN_ISPRIMARY(newchan), + ("new channel is not sub-channel")); + KASSERT(prichan != NULL, ("no primary channel")); + + newchan->ch_prichan = prichan; + newchan->ch_dev = prichan->ch_dev; + + mtx_lock(&prichan->ch_subchan_lock); + TAILQ_INSERT_TAIL(&prichan->ch_subchans, newchan, ch_sublink); + /* + * Bump up sub-channel count and notify anyone that is + * interested in this sub-channel, after this sub-channel + * is setup. + */ + prichan->ch_subchan_cnt++; + mtx_unlock(&prichan->ch_subchan_lock); + wakeup(prichan); + + return 0; +} + +void +vmbus_chan_cpu_set(struct hv_vmbus_channel *chan, int cpu) +{ + KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpu %d", cpu)); + + if (chan->vmbus_sc->vmbus_version == VMBUS_VERSION_WS2008 || + chan->vmbus_sc->vmbus_version == VMBUS_VERSION_WIN7) { + /* Only cpu0 is supported */ + cpu = 0; + } + + chan->ch_cpuid = cpu; + chan->ch_vcpuid = VMBUS_PCPU_GET(chan->vmbus_sc, vcpuid, cpu); + + if (bootverbose) { + printf("vmbus_chan%u: assigned to cpu%u [vcpu%u]\n", + chan->ch_id, chan->ch_cpuid, chan->ch_vcpuid); + } +} + +void +vmbus_chan_cpu_rr(struct hv_vmbus_channel *chan) +{ + static uint32_t vmbus_chan_nextcpu; + int cpu; + + cpu = atomic_fetchadd_int(&vmbus_chan_nextcpu, 1) % mp_ncpus; + vmbus_chan_cpu_set(chan, cpu); +} + +static void +vmbus_chan_cpu_default(struct hv_vmbus_channel *chan) +{ + /* + * By default, pin the channel to cpu0. Devices having + * special channel-cpu mapping requirement should call + * vmbus_chan_cpu_{set,rr}(). + */ + vmbus_chan_cpu_set(chan, 0); +} + +static void +vmbus_chan_msgproc_choffer(struct vmbus_softc *sc, + const struct vmbus_message *msg) +{ + const struct vmbus_chanmsg_choffer *offer; + struct hv_vmbus_channel *chan; + int error; + + offer = (const struct vmbus_chanmsg_choffer *)msg->msg_data; + + chan = vmbus_chan_alloc(sc); + if (chan == NULL) { + device_printf(sc->vmbus_dev, "allocate chan%u failed\n", + offer->chm_chanid); + return; + } + + chan->ch_id = offer->chm_chanid; + chan->ch_subidx = offer->chm_subidx; + chan->ch_guid_type = offer->chm_chtype; + chan->ch_guid_inst = offer->chm_chinst; + + /* Batch reading is on by default */ + chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD; + + chan->ch_monprm->mp_connid = VMBUS_CONNID_EVENT; + if (sc->vmbus_version != VMBUS_VERSION_WS2008) + chan->ch_monprm->mp_connid = offer->chm_connid; + + if (offer->chm_flags1 & VMBUS_CHOFFER_FLAG1_HASMNF) { + /* + * Setup MNF stuffs. + */ + chan->ch_flags |= VMBUS_CHAN_FLAG_HASMNF; + chan->ch_montrig_idx = offer->chm_montrig / VMBUS_MONTRIG_LEN; + if (chan->ch_montrig_idx >= VMBUS_MONTRIGS_MAX) + panic("invalid monitor trigger %u", offer->chm_montrig); + chan->ch_montrig_mask = + 1 << (offer->chm_montrig % VMBUS_MONTRIG_LEN); + } + + /* Select default cpu for this channel. */ + vmbus_chan_cpu_default(chan); + + error = vmbus_chan_add(chan); + if (error) { + device_printf(sc->vmbus_dev, "add chan%u failed: %d\n", + chan->ch_id, error); + vmbus_chan_free(chan); + return; + } + + if (VMBUS_CHAN_ISPRIMARY(chan)) { + /* + * Add device for this primary channel. + * + * NOTE: + * Error is ignored here; don't have much to do if error + * really happens. + */ + vmbus_add_child(chan); + } +} + +/* + * XXX pretty broken; need rework. + */ +static void +vmbus_chan_msgproc_chrescind(struct vmbus_softc *sc, + const struct vmbus_message *msg) +{ + const struct vmbus_chanmsg_chrescind *note; + struct hv_vmbus_channel *chan; + + note = (const struct vmbus_chanmsg_chrescind *)msg->msg_data; + if (note->chm_chanid > VMBUS_CHAN_MAX) { + device_printf(sc->vmbus_dev, "invalid rescinded chan%u\n", + note->chm_chanid); + return; + } + + if (bootverbose) { + device_printf(sc->vmbus_dev, "chan%u rescinded\n", + note->chm_chanid); + } + + chan = sc->vmbus_chmap[note->chm_chanid]; + if (chan == NULL) + return; + sc->vmbus_chmap[note->chm_chanid] = NULL; + + taskqueue_enqueue(taskqueue_thread, &chan->ch_detach_task); +} + +static void +vmbus_chan_detach_task(void *xchan, int pending __unused) +{ + struct hv_vmbus_channel *chan = xchan; + + if (VMBUS_CHAN_ISPRIMARY(chan)) { + /* Only primary channel owns the device */ + vmbus_delete_child(chan); + /* NOTE: DO NOT free primary channel for now */ + } else { + struct vmbus_softc *sc = chan->vmbus_sc; + struct hv_vmbus_channel *pri_chan = chan->ch_prichan; + struct vmbus_chanmsg_chfree *req; + struct vmbus_msghc *mh; + int error; + + mh = vmbus_msghc_get(sc, sizeof(*req)); + if (mh == NULL) { + device_printf(sc->vmbus_dev, + "can not get msg hypercall for chfree(chan%u)\n", + chan->ch_id); + goto remove; + } + + req = vmbus_msghc_dataptr(mh); + req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHFREE; + req->chm_chanid = chan->ch_id; + + error = vmbus_msghc_exec_noresult(mh); + vmbus_msghc_put(sc, mh); + + if (error) { + device_printf(sc->vmbus_dev, + "chfree(chan%u) failed: %d", + chan->ch_id, error); + /* NOTE: Move on! */ + } else { + if (bootverbose) { + device_printf(sc->vmbus_dev, "chan%u freed\n", + chan->ch_id); + } + } +remove: + mtx_lock(&pri_chan->ch_subchan_lock); + TAILQ_REMOVE(&pri_chan->ch_subchans, chan, ch_sublink); + KASSERT(pri_chan->ch_subchan_cnt > 0, + ("invalid subchan_cnt %d", pri_chan->ch_subchan_cnt)); + pri_chan->ch_subchan_cnt--; + mtx_unlock(&pri_chan->ch_subchan_lock); + wakeup(pri_chan); + + vmbus_chan_free(chan); + } +} + +/* + * Detach all devices and destroy the corresponding primary channels. + */ +void +vmbus_chan_destroy_all(struct vmbus_softc *sc) +{ + struct hv_vmbus_channel *chan; + + mtx_lock(&sc->vmbus_prichan_lock); + while ((chan = TAILQ_FIRST(&sc->vmbus_prichans)) != NULL) { + KASSERT(VMBUS_CHAN_ISPRIMARY(chan), ("not primary channel")); + TAILQ_REMOVE(&sc->vmbus_prichans, chan, ch_prilink); + mtx_unlock(&sc->vmbus_prichan_lock); + + vmbus_delete_child(chan); + vmbus_chan_free(chan); + + mtx_lock(&sc->vmbus_prichan_lock); + } + bzero(sc->vmbus_chmap, + sizeof(struct hv_vmbus_channel *) * VMBUS_CHAN_MAX); + mtx_unlock(&sc->vmbus_prichan_lock); +} + +/* + * The channel whose vcpu binding is closest to the currect vcpu will + * be selected. + * If no multi-channel, always select primary channel. + */ +struct hv_vmbus_channel * +vmbus_chan_cpu2chan(struct hv_vmbus_channel *prichan, int cpu) +{ + struct hv_vmbus_channel *sel, *chan; + uint32_t vcpu, sel_dist; + + KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpuid %d", cpu)); + if (TAILQ_EMPTY(&prichan->ch_subchans)) + return prichan; + + vcpu = VMBUS_PCPU_GET(prichan->vmbus_sc, vcpuid, cpu); + +#define CHAN_VCPU_DIST(ch, vcpu) \ + (((ch)->ch_vcpuid > (vcpu)) ? \ + ((ch)->ch_vcpuid - (vcpu)) : ((vcpu) - (ch)->ch_vcpuid)) + +#define CHAN_SELECT(ch) \ +do { \ + sel = ch; \ + sel_dist = CHAN_VCPU_DIST(ch, vcpu); \ +} while (0) + + CHAN_SELECT(prichan); + + mtx_lock(&prichan->ch_subchan_lock); + TAILQ_FOREACH(chan, &prichan->ch_subchans, ch_sublink) { + uint32_t dist; + + KASSERT(chan->ch_stflags & VMBUS_CHAN_ST_OPENED, + ("chan%u is not opened", chan->ch_id)); + + if (chan->ch_vcpuid == vcpu) { + /* Exact match; done */ + CHAN_SELECT(chan); + break; + } + + dist = CHAN_VCPU_DIST(chan, vcpu); + if (sel_dist <= dist) { + /* Far or same distance; skip */ + continue; + } + + /* Select the closer channel. */ + CHAN_SELECT(chan); + } + mtx_unlock(&prichan->ch_subchan_lock); + +#undef CHAN_SELECT +#undef CHAN_VCPU_DIST + + return sel; +} + +struct hv_vmbus_channel ** +vmbus_subchan_get(struct hv_vmbus_channel *pri_chan, int subchan_cnt) +{ + struct hv_vmbus_channel **ret, *chan; + int i; + + ret = malloc(subchan_cnt * sizeof(struct hv_vmbus_channel *), M_TEMP, + M_WAITOK); + + mtx_lock(&pri_chan->ch_subchan_lock); + + while (pri_chan->ch_subchan_cnt < subchan_cnt) + mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "subch", 0); + + i = 0; + TAILQ_FOREACH(chan, &pri_chan->ch_subchans, ch_sublink) { + /* TODO: refcnt chan */ + ret[i] = chan; + + ++i; + if (i == subchan_cnt) + break; + } + KASSERT(i == subchan_cnt, ("invalid subchan count %d, should be %d", + pri_chan->ch_subchan_cnt, subchan_cnt)); + + mtx_unlock(&pri_chan->ch_subchan_lock); + + return ret; +} + +void +vmbus_subchan_rel(struct hv_vmbus_channel **subchan, int subchan_cnt __unused) +{ + + free(subchan, M_TEMP); +} + +void +vmbus_subchan_drain(struct hv_vmbus_channel *pri_chan) +{ + mtx_lock(&pri_chan->ch_subchan_lock); + while (pri_chan->ch_subchan_cnt > 0) + mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "dsubch", 0); + mtx_unlock(&pri_chan->ch_subchan_lock); +} + +void +vmbus_chan_msgproc(struct vmbus_softc *sc, const struct vmbus_message *msg) +{ + vmbus_chanmsg_proc_t msg_proc; + uint32_t msg_type; + + msg_type = ((const struct vmbus_chanmsg_hdr *)msg->msg_data)->chm_type; + KASSERT(msg_type < VMBUS_CHANMSG_TYPE_MAX, + ("invalid message type %u", msg_type)); + + msg_proc = vmbus_chan_msgprocs[msg_type]; + if (msg_proc != NULL) + msg_proc(sc, msg); +} + +void +vmbus_chan_set_readbatch(struct hv_vmbus_channel *chan, bool on) +{ + if (!on) + chan->ch_flags &= ~VMBUS_CHAN_FLAG_BATCHREAD; + else + chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD; +} |
