2 * Copyright (c) 2009-2012,2016 Microsoft Corp.
3 * Copyright (c) 2012 NetApp Inc.
4 * Copyright (c) 2012 Citrix Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/mutex.h>
38 #include <sys/sysctl.h>
39 #include <sys/systm.h>
41 #include <machine/atomic.h>
43 #include <dev/hyperv/include/hyperv_busdma.h>
44 #include <dev/hyperv/vmbus/hyperv_var.h>
45 #include <dev/hyperv/vmbus/vmbus_reg.h>
46 #include <dev/hyperv/vmbus/vmbus_var.h>
47 #include <dev/hyperv/vmbus/vmbus_brvar.h>
48 #include <dev/hyperv/vmbus/vmbus_chanvar.h>
50 static void vmbus_chan_update_evtflagcnt(
52 const struct vmbus_channel *);
53 static void vmbus_chan_close_internal(
54 struct vmbus_channel *);
55 static int vmbus_chan_sysctl_mnf(SYSCTL_HANDLER_ARGS);
56 static void vmbus_chan_sysctl_create(
57 struct vmbus_channel *);
58 static struct vmbus_channel *vmbus_chan_alloc(struct vmbus_softc *);
59 static void vmbus_chan_free(struct vmbus_channel *);
60 static int vmbus_chan_add(struct vmbus_channel *);
61 static void vmbus_chan_cpu_default(struct vmbus_channel *);
62 static int vmbus_chan_release(struct vmbus_channel *);
63 static void vmbus_chan_set_chmap(struct vmbus_channel *);
64 static void vmbus_chan_clear_chmap(struct vmbus_channel *);
66 static void vmbus_chan_ins_prilist(struct vmbus_softc *,
67 struct vmbus_channel *);
68 static void vmbus_chan_rem_prilist(struct vmbus_softc *,
69 struct vmbus_channel *);
70 static void vmbus_chan_ins_list(struct vmbus_softc *,
71 struct vmbus_channel *);
72 static void vmbus_chan_rem_list(struct vmbus_softc *,
73 struct vmbus_channel *);
74 static void vmbus_chan_ins_sublist(struct vmbus_channel *,
75 struct vmbus_channel *);
76 static void vmbus_chan_rem_sublist(struct vmbus_channel *,
77 struct vmbus_channel *);
79 static void vmbus_chan_task(void *, int);
80 static void vmbus_chan_task_nobatch(void *, int);
81 static void vmbus_chan_clrchmap_task(void *, int);
82 static void vmbus_prichan_attach_task(void *, int);
83 static void vmbus_subchan_attach_task(void *, int);
84 static void vmbus_prichan_detach_task(void *, int);
85 static void vmbus_subchan_detach_task(void *, int);
87 static void vmbus_chan_msgproc_choffer(struct vmbus_softc *,
88 const struct vmbus_message *);
89 static void vmbus_chan_msgproc_chrescind(
91 const struct vmbus_message *);
94 * Vmbus channel message processing.
96 static const vmbus_chanmsg_proc_t
97 vmbus_chan_msgprocs[VMBUS_CHANMSG_TYPE_MAX] = {
98 VMBUS_CHANMSG_PROC(CHOFFER, vmbus_chan_msgproc_choffer),
99 VMBUS_CHANMSG_PROC(CHRESCIND, vmbus_chan_msgproc_chrescind),
101 VMBUS_CHANMSG_PROC_WAKEUP(CHOPEN_RESP),
102 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_CONNRESP),
103 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_DISCONNRESP)
107 * Notify host that there are data pending on our TX bufring.
110 vmbus_chan_signal_tx(const struct vmbus_channel *chan)
112 atomic_set_long(chan->ch_evtflag, chan->ch_evtflag_mask);
113 if (chan->ch_txflags & VMBUS_CHAN_TXF_HASMNF)
114 atomic_set_int(chan->ch_montrig, chan->ch_montrig_mask);
116 hypercall_signal_event(chan->ch_monprm_dma.hv_paddr);
120 vmbus_chan_ins_prilist(struct vmbus_softc *sc, struct vmbus_channel *chan)
123 mtx_assert(&sc->vmbus_prichan_lock, MA_OWNED);
124 if (atomic_testandset_int(&chan->ch_stflags,
125 VMBUS_CHAN_ST_ONPRIL_SHIFT))
126 panic("channel is already on the prilist");
127 TAILQ_INSERT_TAIL(&sc->vmbus_prichans, chan, ch_prilink);
131 vmbus_chan_rem_prilist(struct vmbus_softc *sc, struct vmbus_channel *chan)
134 mtx_assert(&sc->vmbus_prichan_lock, MA_OWNED);
135 if (atomic_testandclear_int(&chan->ch_stflags,
136 VMBUS_CHAN_ST_ONPRIL_SHIFT) == 0)
137 panic("channel is not on the prilist");
138 TAILQ_REMOVE(&sc->vmbus_prichans, chan, ch_prilink);
142 vmbus_chan_ins_sublist(struct vmbus_channel *prichan,
143 struct vmbus_channel *chan)
146 mtx_assert(&prichan->ch_subchan_lock, MA_OWNED);
148 if (atomic_testandset_int(&chan->ch_stflags,
149 VMBUS_CHAN_ST_ONSUBL_SHIFT))
150 panic("channel is already on the sublist");
151 TAILQ_INSERT_TAIL(&prichan->ch_subchans, chan, ch_sublink);
153 /* Bump sub-channel count. */
154 prichan->ch_subchan_cnt++;
158 vmbus_chan_rem_sublist(struct vmbus_channel *prichan,
159 struct vmbus_channel *chan)
162 mtx_assert(&prichan->ch_subchan_lock, MA_OWNED);
164 KASSERT(prichan->ch_subchan_cnt > 0,
165 ("invalid subchan_cnt %d", prichan->ch_subchan_cnt));
166 prichan->ch_subchan_cnt--;
168 if (atomic_testandclear_int(&chan->ch_stflags,
169 VMBUS_CHAN_ST_ONSUBL_SHIFT) == 0)
170 panic("channel is not on the sublist");
171 TAILQ_REMOVE(&prichan->ch_subchans, chan, ch_sublink);
175 vmbus_chan_ins_list(struct vmbus_softc *sc, struct vmbus_channel *chan)
178 mtx_assert(&sc->vmbus_chan_lock, MA_OWNED);
179 if (atomic_testandset_int(&chan->ch_stflags,
180 VMBUS_CHAN_ST_ONLIST_SHIFT))
181 panic("channel is already on the list");
182 TAILQ_INSERT_TAIL(&sc->vmbus_chans, chan, ch_link);
186 vmbus_chan_rem_list(struct vmbus_softc *sc, struct vmbus_channel *chan)
189 mtx_assert(&sc->vmbus_chan_lock, MA_OWNED);
190 if (atomic_testandclear_int(&chan->ch_stflags,
191 VMBUS_CHAN_ST_ONLIST_SHIFT) == 0)
192 panic("channel is not on the list");
193 TAILQ_REMOVE(&sc->vmbus_chans, chan, ch_link);
197 vmbus_chan_sysctl_mnf(SYSCTL_HANDLER_ARGS)
199 struct vmbus_channel *chan = arg1;
202 if (chan->ch_txflags & VMBUS_CHAN_TXF_HASMNF)
204 return sysctl_handle_int(oidp, &mnf, 0, req);
208 vmbus_chan_sysctl_create(struct vmbus_channel *chan)
210 struct sysctl_oid *ch_tree, *chid_tree, *br_tree;
211 struct sysctl_ctx_list *ctx;
216 * Add sysctl nodes related to this channel to this
217 * channel's sysctl ctx, so that they can be destroyed
218 * independently upon close of this channel, which can
219 * happen even if the device is not detached.
221 ctx = &chan->ch_sysctl_ctx;
222 sysctl_ctx_init(ctx);
225 * Create dev.NAME.UNIT.channel tree.
227 ch_tree = SYSCTL_ADD_NODE(ctx,
228 SYSCTL_CHILDREN(device_get_sysctl_tree(chan->ch_dev)),
229 OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
234 * Create dev.NAME.UNIT.channel.CHANID tree.
236 if (VMBUS_CHAN_ISPRIMARY(chan))
239 ch_id = chan->ch_prichan->ch_id;
240 snprintf(name, sizeof(name), "%d", ch_id);
241 chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree),
242 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
243 if (chid_tree == NULL)
246 if (!VMBUS_CHAN_ISPRIMARY(chan)) {
248 * Create dev.NAME.UNIT.channel.CHANID.sub tree.
250 ch_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree),
251 OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
256 * Create dev.NAME.UNIT.channel.CHANID.sub.SUBIDX tree.
259 * chid_tree is changed to this new sysctl tree.
261 snprintf(name, sizeof(name), "%d", chan->ch_subidx);
262 chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree),
263 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
264 if (chid_tree == NULL)
267 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO,
268 "chanid", CTLFLAG_RD, &chan->ch_id, 0, "channel id");
271 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO,
272 "cpu", CTLFLAG_RD, &chan->ch_cpuid, 0, "owner CPU id");
273 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO,
274 "mnf", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
275 chan, 0, vmbus_chan_sysctl_mnf, "I",
276 "has monitor notification facilities");
278 br_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO,
279 "br", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
280 if (br_tree != NULL) {
282 * Create sysctl tree for RX bufring.
284 vmbus_br_sysctl_create(ctx, br_tree, &chan->ch_rxbr.rxbr, "rx");
286 * Create sysctl tree for TX bufring.
288 vmbus_br_sysctl_create(ctx, br_tree, &chan->ch_txbr.txbr, "tx");
293 vmbus_chan_open(struct vmbus_channel *chan, int txbr_size, int rxbr_size,
294 const void *udata, int udlen, vmbus_chan_callback_t cb, void *cbarg)
296 struct vmbus_chan_br cbr;
300 * Allocate the TX+RX bufrings.
302 KASSERT(chan->ch_bufring == NULL, ("bufrings are allocated"));
303 chan->ch_bufring = hyperv_dmamem_alloc(bus_get_dma_tag(chan->ch_dev),
304 PAGE_SIZE, 0, txbr_size + rxbr_size, &chan->ch_bufring_dma,
306 if (chan->ch_bufring == NULL) {
307 device_printf(chan->ch_dev, "bufring allocation failed\n");
311 cbr.cbr = chan->ch_bufring;
312 cbr.cbr_paddr = chan->ch_bufring_dma.hv_paddr;
313 cbr.cbr_txsz = txbr_size;
314 cbr.cbr_rxsz = rxbr_size;
316 error = vmbus_chan_open_br(chan, &cbr, udata, udlen, cb, cbarg);
318 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring);
319 chan->ch_bufring = NULL;
325 vmbus_chan_open_br(struct vmbus_channel *chan, const struct vmbus_chan_br *cbr,
326 const void *udata, int udlen, vmbus_chan_callback_t cb, void *cbarg)
328 struct vmbus_softc *sc = chan->ch_vmbus;
329 const struct vmbus_chanmsg_chopen_resp *resp;
330 const struct vmbus_message *msg;
331 struct vmbus_chanmsg_chopen *req;
332 struct vmbus_msghc *mh;
334 int error, txbr_size, rxbr_size;
338 if (udlen > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) {
339 device_printf(sc->vmbus_dev,
340 "invalid udata len %d for chan%u\n", udlen, chan->ch_id);
345 txbr_size = cbr->cbr_txsz;
346 rxbr_size = cbr->cbr_rxsz;
347 KASSERT((txbr_size & PAGE_MASK) == 0,
348 ("send bufring size is not multiple page"));
349 KASSERT((rxbr_size & PAGE_MASK) == 0,
350 ("recv bufring size is not multiple page"));
351 KASSERT((cbr->cbr_paddr & PAGE_MASK) == 0,
352 ("bufring is not page aligned"));
355 * Zero out the TX/RX bufrings, in case that they were used before.
357 memset(br, 0, txbr_size + rxbr_size);
359 if (atomic_testandset_int(&chan->ch_stflags,
360 VMBUS_CHAN_ST_OPENED_SHIFT))
361 panic("double-open chan%u", chan->ch_id);
364 chan->ch_cbarg = cbarg;
366 vmbus_chan_update_evtflagcnt(sc, chan);
368 chan->ch_tq = VMBUS_PCPU_GET(chan->ch_vmbus, event_tq, chan->ch_cpuid);
369 if (chan->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD)
370 task_fn = vmbus_chan_task;
372 task_fn = vmbus_chan_task_nobatch;
373 TASK_INIT(&chan->ch_task, 0, task_fn, chan);
375 /* TX bufring comes first */
376 vmbus_txbr_setup(&chan->ch_txbr, br, txbr_size);
377 /* RX bufring immediately follows TX bufring */
378 vmbus_rxbr_setup(&chan->ch_rxbr, br + txbr_size, rxbr_size);
380 /* Create sysctl tree for this channel */
381 vmbus_chan_sysctl_create(chan);
384 * Connect the bufrings, both RX and TX, to this channel.
386 error = vmbus_chan_gpadl_connect(chan, cbr->cbr_paddr,
387 txbr_size + rxbr_size, &chan->ch_bufring_gpadl);
389 device_printf(sc->vmbus_dev,
390 "failed to connect bufring GPADL to chan%u\n", chan->ch_id);
395 * Install this channel, before it is opened, but after everything
396 * else has been setup.
398 vmbus_chan_set_chmap(chan);
401 * Open channel w/ the bufring GPADL on the target CPU.
403 mh = vmbus_msghc_get(sc, sizeof(*req));
405 device_printf(sc->vmbus_dev,
406 "can not get msg hypercall for chopen(chan%u)\n",
412 req = vmbus_msghc_dataptr(mh);
413 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN;
414 req->chm_chanid = chan->ch_id;
415 req->chm_openid = chan->ch_id;
416 req->chm_gpadl = chan->ch_bufring_gpadl;
417 req->chm_vcpuid = chan->ch_vcpuid;
418 req->chm_txbr_pgcnt = txbr_size >> PAGE_SHIFT;
420 memcpy(req->chm_udata, udata, udlen);
422 error = vmbus_msghc_exec(sc, mh);
424 device_printf(sc->vmbus_dev,
425 "chopen(chan%u) msg hypercall exec failed: %d\n",
427 vmbus_msghc_put(sc, mh);
431 msg = vmbus_msghc_wait_result(sc, mh);
432 resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data;
433 status = resp->chm_status;
435 vmbus_msghc_put(sc, mh);
439 device_printf(sc->vmbus_dev, "chan%u opened\n",
445 device_printf(sc->vmbus_dev, "failed to open chan%u\n", chan->ch_id);
449 vmbus_chan_clear_chmap(chan);
450 if (chan->ch_bufring_gpadl) {
451 vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl);
452 chan->ch_bufring_gpadl = 0;
454 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED);
459 vmbus_chan_gpadl_connect(struct vmbus_channel *chan, bus_addr_t paddr,
460 int size, uint32_t *gpadl0)
462 struct vmbus_softc *sc = chan->ch_vmbus;
463 struct vmbus_msghc *mh;
464 struct vmbus_chanmsg_gpadl_conn *req;
465 const struct vmbus_message *msg;
467 uint32_t gpadl, status;
468 int page_count, range_len, i, cnt, error;
472 * Preliminary checks.
475 KASSERT((size & PAGE_MASK) == 0,
476 ("invalid GPA size %d, not multiple page size", size));
477 page_count = size >> PAGE_SHIFT;
479 KASSERT((paddr & PAGE_MASK) == 0,
480 ("GPA is not page aligned %jx", (uintmax_t)paddr));
481 page_id = paddr >> PAGE_SHIFT;
483 range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]);
485 * We don't support multiple GPA ranges.
487 if (range_len > UINT16_MAX) {
488 device_printf(sc->vmbus_dev, "GPA too large, %d pages\n",
496 gpadl = vmbus_gpadl_alloc(sc);
500 * Connect this GPADL to the target channel.
503 * Since each message can only hold small set of page
504 * addresses, several messages may be required to
505 * complete the connection.
507 if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX)
508 cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX;
513 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn,
514 chm_range.gpa_page[cnt]);
515 mh = vmbus_msghc_get(sc, reqsz);
517 device_printf(sc->vmbus_dev,
518 "can not get msg hypercall for gpadl->chan%u\n",
523 req = vmbus_msghc_dataptr(mh);
524 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN;
525 req->chm_chanid = chan->ch_id;
526 req->chm_gpadl = gpadl;
527 req->chm_range_len = range_len;
528 req->chm_range_cnt = 1;
529 req->chm_range.gpa_len = size;
530 req->chm_range.gpa_ofs = 0;
531 for (i = 0; i < cnt; ++i)
532 req->chm_range.gpa_page[i] = page_id++;
534 error = vmbus_msghc_exec(sc, mh);
536 device_printf(sc->vmbus_dev,
537 "gpadl->chan%u msg hypercall exec failed: %d\n",
539 vmbus_msghc_put(sc, mh);
543 while (page_count > 0) {
544 struct vmbus_chanmsg_gpadl_subconn *subreq;
546 if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX)
547 cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX;
552 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn,
554 vmbus_msghc_reset(mh, reqsz);
556 subreq = vmbus_msghc_dataptr(mh);
557 subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN;
558 subreq->chm_gpadl = gpadl;
559 for (i = 0; i < cnt; ++i)
560 subreq->chm_gpa_page[i] = page_id++;
562 vmbus_msghc_exec_noresult(mh);
564 KASSERT(page_count == 0, ("invalid page count %d", page_count));
566 msg = vmbus_msghc_wait_result(sc, mh);
567 status = ((const struct vmbus_chanmsg_gpadl_connresp *)
568 msg->msg_data)->chm_status;
570 vmbus_msghc_put(sc, mh);
573 device_printf(sc->vmbus_dev, "gpadl->chan%u failed: "
574 "status %u\n", chan->ch_id, status);
578 device_printf(sc->vmbus_dev, "gpadl->chan%u "
579 "succeeded\n", chan->ch_id);
586 * Disconnect the GPA from the target channel
589 vmbus_chan_gpadl_disconnect(struct vmbus_channel *chan, uint32_t gpadl)
591 struct vmbus_softc *sc = chan->ch_vmbus;
592 struct vmbus_msghc *mh;
593 struct vmbus_chanmsg_gpadl_disconn *req;
596 mh = vmbus_msghc_get(sc, sizeof(*req));
598 device_printf(sc->vmbus_dev,
599 "can not get msg hypercall for gpa x->chan%u\n",
604 req = vmbus_msghc_dataptr(mh);
605 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN;
606 req->chm_chanid = chan->ch_id;
607 req->chm_gpadl = gpadl;
609 error = vmbus_msghc_exec(sc, mh);
611 device_printf(sc->vmbus_dev,
612 "gpa x->chan%u msg hypercall exec failed: %d\n",
614 vmbus_msghc_put(sc, mh);
618 vmbus_msghc_wait_result(sc, mh);
619 /* Discard result; no useful information */
620 vmbus_msghc_put(sc, mh);
626 vmbus_chan_clrchmap_task(void *xchan, int pending __unused)
628 struct vmbus_channel *chan = xchan;
631 chan->ch_vmbus->vmbus_chmap[chan->ch_id] = NULL;
636 vmbus_chan_clear_chmap(struct vmbus_channel *chan)
638 struct task chmap_task;
640 TASK_INIT(&chmap_task, 0, vmbus_chan_clrchmap_task, chan);
641 taskqueue_enqueue(chan->ch_tq, &chmap_task);
642 taskqueue_drain(chan->ch_tq, &chmap_task);
646 vmbus_chan_set_chmap(struct vmbus_channel *chan)
649 chan->ch_vmbus->vmbus_chmap[chan->ch_id] = chan;
653 vmbus_chan_close_internal(struct vmbus_channel *chan)
655 struct vmbus_softc *sc = chan->ch_vmbus;
656 struct vmbus_msghc *mh;
657 struct vmbus_chanmsg_chclose *req;
660 /* TODO: stringent check */
661 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED);
664 * Free this channel's sysctl tree attached to its device's
667 sysctl_ctx_free(&chan->ch_sysctl_ctx);
671 * Order is critical. This channel _must_ be uninstalled first,
672 * else the channel task may be enqueued by the IDT after it has
675 vmbus_chan_clear_chmap(chan);
676 taskqueue_drain(chan->ch_tq, &chan->ch_task);
680 * Close this channel.
682 mh = vmbus_msghc_get(sc, sizeof(*req));
684 device_printf(sc->vmbus_dev,
685 "can not get msg hypercall for chclose(chan%u)\n",
690 req = vmbus_msghc_dataptr(mh);
691 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE;
692 req->chm_chanid = chan->ch_id;
694 error = vmbus_msghc_exec_noresult(mh);
695 vmbus_msghc_put(sc, mh);
698 device_printf(sc->vmbus_dev,
699 "chclose(chan%u) msg hypercall exec failed: %d\n",
702 } else if (bootverbose) {
703 device_printf(sc->vmbus_dev, "close chan%u\n", chan->ch_id);
707 * Disconnect the TX+RX bufrings from this channel.
709 if (chan->ch_bufring_gpadl) {
710 vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl);
711 chan->ch_bufring_gpadl = 0;
715 * Destroy the TX+RX bufrings.
717 if (chan->ch_bufring != NULL) {
718 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring);
719 chan->ch_bufring = NULL;
724 * Caller should make sure that all sub-channels have
725 * been added to 'chan' and all to-be-closed channels
726 * are not being opened.
729 vmbus_chan_close(struct vmbus_channel *chan)
733 if (!VMBUS_CHAN_ISPRIMARY(chan)) {
735 * Sub-channel is closed when its primary channel
742 * Close all sub-channels, if any.
744 subchan_cnt = chan->ch_subchan_cnt;
745 if (subchan_cnt > 0) {
746 struct vmbus_channel **subchan;
749 subchan = vmbus_subchan_get(chan, subchan_cnt);
750 for (i = 0; i < subchan_cnt; ++i)
751 vmbus_chan_close_internal(subchan[i]);
752 vmbus_subchan_rel(subchan, subchan_cnt);
755 /* Then close the primary channel. */
756 vmbus_chan_close_internal(chan);
760 vmbus_chan_intr_drain(struct vmbus_channel *chan)
763 taskqueue_drain(chan->ch_tq, &chan->ch_task);
767 vmbus_chan_send(struct vmbus_channel *chan, uint16_t type, uint16_t flags,
768 void *data, int dlen, uint64_t xactid)
770 struct vmbus_chanpkt pkt;
771 int pktlen, pad_pktlen, hlen, error;
777 pktlen = hlen + dlen;
778 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen);
779 KASSERT(pad_pktlen <= vmbus_txbr_maxpktsz(&chan->ch_txbr),
780 ("invalid packet size %d", pad_pktlen));
782 pkt.cp_hdr.cph_type = type;
783 pkt.cp_hdr.cph_flags = flags;
784 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen);
785 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen);
786 pkt.cp_hdr.cph_xactid = xactid;
788 iov[0].iov_base = &pkt;
789 iov[0].iov_len = hlen;
790 iov[1].iov_base = data;
791 iov[1].iov_len = dlen;
792 iov[2].iov_base = &pad;
793 iov[2].iov_len = pad_pktlen - pktlen;
795 error = vmbus_txbr_write(&chan->ch_txbr, iov, 3, &send_evt);
796 if (!error && send_evt)
797 vmbus_chan_signal_tx(chan);
802 vmbus_chan_send_sglist(struct vmbus_channel *chan,
803 struct vmbus_gpa sg[], int sglen, void *data, int dlen, uint64_t xactid)
805 struct vmbus_chanpkt_sglist pkt;
806 int pktlen, pad_pktlen, hlen, error;
811 hlen = __offsetof(struct vmbus_chanpkt_sglist, cp_gpa[sglen]);
812 pktlen = hlen + dlen;
813 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen);
814 KASSERT(pad_pktlen <= vmbus_txbr_maxpktsz(&chan->ch_txbr),
815 ("invalid packet size %d", pad_pktlen));
817 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA;
818 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC;
819 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen);
820 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen);
821 pkt.cp_hdr.cph_xactid = xactid;
823 pkt.cp_gpa_cnt = sglen;
825 iov[0].iov_base = &pkt;
826 iov[0].iov_len = sizeof(pkt);
827 iov[1].iov_base = sg;
828 iov[1].iov_len = sizeof(struct vmbus_gpa) * sglen;
829 iov[2].iov_base = data;
830 iov[2].iov_len = dlen;
831 iov[3].iov_base = &pad;
832 iov[3].iov_len = pad_pktlen - pktlen;
834 error = vmbus_txbr_write(&chan->ch_txbr, iov, 4, &send_evt);
835 if (!error && send_evt)
836 vmbus_chan_signal_tx(chan);
841 vmbus_chan_send_prplist(struct vmbus_channel *chan,
842 struct vmbus_gpa_range *prp, int prp_cnt, void *data, int dlen,
845 struct vmbus_chanpkt_prplist pkt;
846 int pktlen, pad_pktlen, hlen, error;
851 hlen = __offsetof(struct vmbus_chanpkt_prplist,
852 cp_range[0].gpa_page[prp_cnt]);
853 pktlen = hlen + dlen;
854 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen);
855 KASSERT(pad_pktlen <= vmbus_txbr_maxpktsz(&chan->ch_txbr),
856 ("invalid packet size %d", pad_pktlen));
858 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA;
859 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC;
860 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen);
861 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen);
862 pkt.cp_hdr.cph_xactid = xactid;
864 pkt.cp_range_cnt = 1;
866 iov[0].iov_base = &pkt;
867 iov[0].iov_len = sizeof(pkt);
868 iov[1].iov_base = prp;
869 iov[1].iov_len = __offsetof(struct vmbus_gpa_range, gpa_page[prp_cnt]);
870 iov[2].iov_base = data;
871 iov[2].iov_len = dlen;
872 iov[3].iov_base = &pad;
873 iov[3].iov_len = pad_pktlen - pktlen;
875 error = vmbus_txbr_write(&chan->ch_txbr, iov, 4, &send_evt);
876 if (!error && send_evt)
877 vmbus_chan_signal_tx(chan);
882 vmbus_chan_recv(struct vmbus_channel *chan, void *data, int *dlen0,
885 struct vmbus_chanpkt_hdr pkt;
886 int error, dlen, hlen;
888 error = vmbus_rxbr_peek(&chan->ch_rxbr, &pkt, sizeof(pkt));
892 if (__predict_false(pkt.cph_hlen < VMBUS_CHANPKT_HLEN_MIN)) {
893 device_printf(chan->ch_dev, "invalid hlen %u\n",
895 /* XXX this channel is dead actually. */
898 if (__predict_false(pkt.cph_hlen > pkt.cph_tlen)) {
899 device_printf(chan->ch_dev, "invalid hlen %u and tlen %u\n",
900 pkt.cph_hlen, pkt.cph_tlen);
901 /* XXX this channel is dead actually. */
905 hlen = VMBUS_CHANPKT_GETLEN(pkt.cph_hlen);
906 dlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen) - hlen;
909 /* Return the size of this packet's data. */
914 *xactid = pkt.cph_xactid;
917 /* Skip packet header */
918 error = vmbus_rxbr_read(&chan->ch_rxbr, data, dlen, hlen);
919 KASSERT(!error, ("vmbus_rxbr_read failed"));
925 vmbus_chan_recv_pkt(struct vmbus_channel *chan,
926 struct vmbus_chanpkt_hdr *pkt0, int *pktlen0)
928 struct vmbus_chanpkt_hdr pkt;
931 error = vmbus_rxbr_peek(&chan->ch_rxbr, &pkt, sizeof(pkt));
935 if (__predict_false(pkt.cph_hlen < VMBUS_CHANPKT_HLEN_MIN)) {
936 device_printf(chan->ch_dev, "invalid hlen %u\n",
938 /* XXX this channel is dead actually. */
941 if (__predict_false(pkt.cph_hlen > pkt.cph_tlen)) {
942 device_printf(chan->ch_dev, "invalid hlen %u and tlen %u\n",
943 pkt.cph_hlen, pkt.cph_tlen);
944 /* XXX this channel is dead actually. */
948 pktlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen);
949 if (*pktlen0 < pktlen) {
950 /* Return the size of this packet. */
956 /* Include packet header */
957 error = vmbus_rxbr_read(&chan->ch_rxbr, pkt0, pktlen, 0);
958 KASSERT(!error, ("vmbus_rxbr_read failed"));
964 vmbus_chan_task(void *xchan, int pending __unused)
966 struct vmbus_channel *chan = xchan;
967 vmbus_chan_callback_t cb = chan->ch_cb;
968 void *cbarg = chan->ch_cbarg;
971 * Optimize host to guest signaling by ensuring:
972 * 1. While reading the channel, we disable interrupts from
974 * 2. Ensure that we process all posted messages from the host
975 * before returning from this callback.
976 * 3. Once we return, enable signaling from the host. Once this
977 * state is set we check to see if additional packets are
978 * available to read. In this case we repeat the process.
980 * NOTE: Interrupt has been disabled in the ISR.
987 left = vmbus_rxbr_intr_unmask(&chan->ch_rxbr);
989 /* No more data in RX bufring; done */
992 vmbus_rxbr_intr_mask(&chan->ch_rxbr);
997 vmbus_chan_task_nobatch(void *xchan, int pending __unused)
999 struct vmbus_channel *chan = xchan;
1001 chan->ch_cb(chan, chan->ch_cbarg);
1004 static __inline void
1005 vmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags,
1010 for (f = 0; f < flag_cnt; ++f) {
1015 if (event_flags[f] == 0)
1018 flags = atomic_swap_long(&event_flags[f], 0);
1019 chid_base = f << VMBUS_EVTFLAG_SHIFT;
1021 while ((chid_ofs = ffsl(flags)) != 0) {
1022 struct vmbus_channel *chan;
1024 --chid_ofs; /* NOTE: ffsl is 1-based */
1025 flags &= ~(1UL << chid_ofs);
1027 chan = sc->vmbus_chmap[chid_base + chid_ofs];
1028 if (__predict_false(chan == NULL)) {
1029 /* Channel is closed. */
1032 __compiler_membar();
1034 if (chan->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD)
1035 vmbus_rxbr_intr_mask(&chan->ch_rxbr);
1036 taskqueue_enqueue(chan->ch_tq, &chan->ch_task);
1042 vmbus_event_proc(struct vmbus_softc *sc, int cpu)
1044 struct vmbus_evtflags *eventf;
1047 * On Host with Win8 or above, the event page can be checked directly
1048 * to get the id of the channel that has the pending interrupt.
1050 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE;
1051 vmbus_event_flags_proc(sc, eventf->evt_flags,
1052 VMBUS_PCPU_GET(sc, event_flags_cnt, cpu));
1056 vmbus_event_proc_compat(struct vmbus_softc *sc, int cpu)
1058 struct vmbus_evtflags *eventf;
1060 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE;
1061 if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) {
1062 vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags,
1063 VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT);
1068 vmbus_chan_update_evtflagcnt(struct vmbus_softc *sc,
1069 const struct vmbus_channel *chan)
1071 volatile int *flag_cnt_ptr;
1074 flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1;
1075 flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->ch_cpuid);
1080 old_flag_cnt = *flag_cnt_ptr;
1081 if (old_flag_cnt >= flag_cnt)
1083 if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) {
1085 device_printf(sc->vmbus_dev,
1086 "channel%u update cpu%d flag_cnt to %d\n",
1087 chan->ch_id, chan->ch_cpuid, flag_cnt);
1094 static struct vmbus_channel *
1095 vmbus_chan_alloc(struct vmbus_softc *sc)
1097 struct vmbus_channel *chan;
1099 chan = malloc(sizeof(*chan), M_DEVBUF, M_WAITOK | M_ZERO);
1101 chan->ch_monprm = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev),
1102 HYPERCALL_PARAM_ALIGN, 0, sizeof(struct hyperv_mon_param),
1103 &chan->ch_monprm_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO);
1104 if (chan->ch_monprm == NULL) {
1105 device_printf(sc->vmbus_dev, "monprm alloc failed\n");
1106 free(chan, M_DEVBUF);
1110 chan->ch_vmbus = sc;
1111 mtx_init(&chan->ch_subchan_lock, "vmbus subchan", NULL, MTX_DEF);
1112 TAILQ_INIT(&chan->ch_subchans);
1113 vmbus_rxbr_init(&chan->ch_rxbr);
1114 vmbus_txbr_init(&chan->ch_txbr);
1120 vmbus_chan_free(struct vmbus_channel *chan)
1123 KASSERT(TAILQ_EMPTY(&chan->ch_subchans) && chan->ch_subchan_cnt == 0,
1124 ("still owns sub-channels"));
1125 KASSERT((chan->ch_stflags &
1126 (VMBUS_CHAN_ST_OPENED |
1127 VMBUS_CHAN_ST_ONPRIL |
1128 VMBUS_CHAN_ST_ONSUBL |
1129 VMBUS_CHAN_ST_ONLIST)) == 0, ("free busy channel"));
1130 hyperv_dmamem_free(&chan->ch_monprm_dma, chan->ch_monprm);
1131 mtx_destroy(&chan->ch_subchan_lock);
1132 vmbus_rxbr_deinit(&chan->ch_rxbr);
1133 vmbus_txbr_deinit(&chan->ch_txbr);
1134 free(chan, M_DEVBUF);
1138 vmbus_chan_add(struct vmbus_channel *newchan)
1140 struct vmbus_softc *sc = newchan->ch_vmbus;
1141 struct vmbus_channel *prichan;
1143 if (newchan->ch_id == 0) {
1146 * Chan0 will neither be processed nor should be offered;
1149 device_printf(sc->vmbus_dev, "got chan0 offer, discard\n");
1151 } else if (newchan->ch_id >= VMBUS_CHAN_MAX) {
1152 device_printf(sc->vmbus_dev, "invalid chan%u offer\n",
1158 device_printf(sc->vmbus_dev, "chan%u subidx%u offer\n",
1159 newchan->ch_id, newchan->ch_subidx);
1162 mtx_lock(&sc->vmbus_prichan_lock);
1163 TAILQ_FOREACH(prichan, &sc->vmbus_prichans, ch_prilink) {
1165 * Sub-channel will have the same type GUID and instance
1166 * GUID as its primary channel.
1168 if (memcmp(&prichan->ch_guid_type, &newchan->ch_guid_type,
1169 sizeof(struct hyperv_guid)) == 0 &&
1170 memcmp(&prichan->ch_guid_inst, &newchan->ch_guid_inst,
1171 sizeof(struct hyperv_guid)) == 0)
1174 if (VMBUS_CHAN_ISPRIMARY(newchan)) {
1175 if (prichan == NULL) {
1176 /* Install the new primary channel */
1177 vmbus_chan_ins_prilist(sc, newchan);
1178 mtx_unlock(&sc->vmbus_prichan_lock);
1181 mtx_unlock(&sc->vmbus_prichan_lock);
1182 device_printf(sc->vmbus_dev, "duplicated primary "
1183 "chan%u\n", newchan->ch_id);
1186 } else { /* Sub-channel */
1187 if (prichan == NULL) {
1188 mtx_unlock(&sc->vmbus_prichan_lock);
1189 device_printf(sc->vmbus_dev, "no primary chan for "
1190 "chan%u\n", newchan->ch_id);
1194 * Found the primary channel for this sub-channel and
1197 * XXX refcnt prichan
1200 mtx_unlock(&sc->vmbus_prichan_lock);
1203 * This is a sub-channel; link it with the primary channel.
1205 KASSERT(!VMBUS_CHAN_ISPRIMARY(newchan),
1206 ("new channel is not sub-channel"));
1207 KASSERT(prichan != NULL, ("no primary channel"));
1209 newchan->ch_prichan = prichan;
1210 newchan->ch_dev = prichan->ch_dev;
1212 mtx_lock(&prichan->ch_subchan_lock);
1213 vmbus_chan_ins_sublist(prichan, newchan);
1214 mtx_unlock(&prichan->ch_subchan_lock);
1216 * Notify anyone that is interested in this sub-channel,
1217 * after this sub-channel is setup.
1222 * Hook this channel up for later rescind.
1224 mtx_lock(&sc->vmbus_chan_lock);
1225 vmbus_chan_ins_list(sc, newchan);
1226 mtx_unlock(&sc->vmbus_chan_lock);
1231 vmbus_chan_cpu_set(struct vmbus_channel *chan, int cpu)
1233 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpu %d", cpu));
1235 if (chan->ch_vmbus->vmbus_version == VMBUS_VERSION_WS2008 ||
1236 chan->ch_vmbus->vmbus_version == VMBUS_VERSION_WIN7) {
1237 /* Only cpu0 is supported */
1241 chan->ch_cpuid = cpu;
1242 chan->ch_vcpuid = VMBUS_PCPU_GET(chan->ch_vmbus, vcpuid, cpu);
1245 printf("vmbus_chan%u: assigned to cpu%u [vcpu%u]\n",
1246 chan->ch_id, chan->ch_cpuid, chan->ch_vcpuid);
1251 vmbus_chan_cpu_rr(struct vmbus_channel *chan)
1253 static uint32_t vmbus_chan_nextcpu;
1256 cpu = atomic_fetchadd_int(&vmbus_chan_nextcpu, 1) % mp_ncpus;
1257 vmbus_chan_cpu_set(chan, cpu);
1261 vmbus_chan_cpu_default(struct vmbus_channel *chan)
1264 * By default, pin the channel to cpu0. Devices having
1265 * special channel-cpu mapping requirement should call
1266 * vmbus_chan_cpu_{set,rr}().
1268 vmbus_chan_cpu_set(chan, 0);
1272 vmbus_chan_msgproc_choffer(struct vmbus_softc *sc,
1273 const struct vmbus_message *msg)
1275 const struct vmbus_chanmsg_choffer *offer;
1276 struct vmbus_channel *chan;
1277 task_fn_t *detach_fn, *attach_fn;
1280 offer = (const struct vmbus_chanmsg_choffer *)msg->msg_data;
1282 chan = vmbus_chan_alloc(sc);
1284 device_printf(sc->vmbus_dev, "allocate chan%u failed\n",
1289 chan->ch_id = offer->chm_chanid;
1290 chan->ch_subidx = offer->chm_subidx;
1291 chan->ch_guid_type = offer->chm_chtype;
1292 chan->ch_guid_inst = offer->chm_chinst;
1294 /* Batch reading is on by default */
1295 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD;
1297 chan->ch_monprm->mp_connid = VMBUS_CONNID_EVENT;
1298 if (sc->vmbus_version != VMBUS_VERSION_WS2008)
1299 chan->ch_monprm->mp_connid = offer->chm_connid;
1301 if (offer->chm_flags1 & VMBUS_CHOFFER_FLAG1_HASMNF) {
1307 chan->ch_txflags |= VMBUS_CHAN_TXF_HASMNF;
1309 trig_idx = offer->chm_montrig / VMBUS_MONTRIG_LEN;
1310 if (trig_idx >= VMBUS_MONTRIGS_MAX)
1311 panic("invalid monitor trigger %u", offer->chm_montrig);
1313 &sc->vmbus_mnf2->mnf_trigs[trig_idx].mt_pending;
1315 chan->ch_montrig_mask =
1316 1 << (offer->chm_montrig % VMBUS_MONTRIG_LEN);
1323 &sc->vmbus_tx_evtflags[chan->ch_id >> VMBUS_EVTFLAG_SHIFT];
1324 chan->ch_evtflag_mask = 1UL << (chan->ch_id & VMBUS_EVTFLAG_MASK);
1327 * Setup attach and detach tasks.
1329 if (VMBUS_CHAN_ISPRIMARY(chan)) {
1330 chan->ch_mgmt_tq = sc->vmbus_devtq;
1331 attach_fn = vmbus_prichan_attach_task;
1332 detach_fn = vmbus_prichan_detach_task;
1334 chan->ch_mgmt_tq = sc->vmbus_subchtq;
1335 attach_fn = vmbus_subchan_attach_task;
1336 detach_fn = vmbus_subchan_detach_task;
1338 TASK_INIT(&chan->ch_attach_task, 0, attach_fn, chan);
1339 TASK_INIT(&chan->ch_detach_task, 0, detach_fn, chan);
1341 /* Select default cpu for this channel. */
1342 vmbus_chan_cpu_default(chan);
1344 error = vmbus_chan_add(chan);
1346 device_printf(sc->vmbus_dev, "add chan%u failed: %d\n",
1347 chan->ch_id, error);
1348 vmbus_chan_free(chan);
1351 taskqueue_enqueue(chan->ch_mgmt_tq, &chan->ch_attach_task);
1355 vmbus_chan_msgproc_chrescind(struct vmbus_softc *sc,
1356 const struct vmbus_message *msg)
1358 const struct vmbus_chanmsg_chrescind *note;
1359 struct vmbus_channel *chan;
1361 note = (const struct vmbus_chanmsg_chrescind *)msg->msg_data;
1362 if (note->chm_chanid > VMBUS_CHAN_MAX) {
1363 device_printf(sc->vmbus_dev, "invalid rescinded chan%u\n",
1369 device_printf(sc->vmbus_dev, "chan%u rescinded\n",
1374 * Find and remove the target channel from the channel list.
1376 mtx_lock(&sc->vmbus_chan_lock);
1377 TAILQ_FOREACH(chan, &sc->vmbus_chans, ch_link) {
1378 if (chan->ch_id == note->chm_chanid)
1382 mtx_unlock(&sc->vmbus_chan_lock);
1383 device_printf(sc->vmbus_dev, "chan%u is not offered\n",
1387 vmbus_chan_rem_list(sc, chan);
1388 mtx_unlock(&sc->vmbus_chan_lock);
1390 if (VMBUS_CHAN_ISPRIMARY(chan)) {
1392 * The target channel is a primary channel; remove the
1393 * target channel from the primary channel list now,
1394 * instead of later, so that it will not be found by
1395 * other sub-channel offers, which are processed in
1398 mtx_lock(&sc->vmbus_prichan_lock);
1399 vmbus_chan_rem_prilist(sc, chan);
1400 mtx_unlock(&sc->vmbus_prichan_lock);
1403 /* Detach the target channel. */
1404 taskqueue_enqueue(chan->ch_mgmt_tq, &chan->ch_detach_task);
1408 vmbus_chan_release(struct vmbus_channel *chan)
1410 struct vmbus_softc *sc = chan->ch_vmbus;
1411 struct vmbus_chanmsg_chfree *req;
1412 struct vmbus_msghc *mh;
1415 mh = vmbus_msghc_get(sc, sizeof(*req));
1417 device_printf(sc->vmbus_dev, "can not get msg hypercall for "
1418 "chfree(chan%u)\n", chan->ch_id);
1422 req = vmbus_msghc_dataptr(mh);
1423 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHFREE;
1424 req->chm_chanid = chan->ch_id;
1426 error = vmbus_msghc_exec_noresult(mh);
1427 vmbus_msghc_put(sc, mh);
1430 device_printf(sc->vmbus_dev, "chfree(chan%u) failed: %d",
1431 chan->ch_id, error);
1434 device_printf(sc->vmbus_dev, "chan%u freed\n",
1442 vmbus_prichan_detach_task(void *xchan, int pending __unused)
1444 struct vmbus_channel *chan = xchan;
1446 KASSERT(VMBUS_CHAN_ISPRIMARY(chan),
1447 ("chan%u is not primary channel", chan->ch_id));
1449 /* Delete and detach the device associated with this channel. */
1450 vmbus_delete_child(chan);
1452 /* Release this channel (back to vmbus). */
1453 vmbus_chan_release(chan);
1455 /* Free this channel's resource. */
1456 vmbus_chan_free(chan);
1460 vmbus_subchan_detach_task(void *xchan, int pending __unused)
1462 struct vmbus_channel *chan = xchan;
1463 struct vmbus_channel *pri_chan = chan->ch_prichan;
1465 KASSERT(!VMBUS_CHAN_ISPRIMARY(chan),
1466 ("chan%u is primary channel", chan->ch_id));
1468 /* Release this channel (back to vmbus). */
1469 vmbus_chan_release(chan);
1471 /* Unlink from its primary channel's sub-channel list. */
1472 mtx_lock(&pri_chan->ch_subchan_lock);
1473 vmbus_chan_rem_sublist(pri_chan, chan);
1474 mtx_unlock(&pri_chan->ch_subchan_lock);
1475 /* Notify anyone that is waiting for this sub-channel to vanish. */
1478 /* Free this channel's resource. */
1479 vmbus_chan_free(chan);
1483 vmbus_prichan_attach_task(void *xchan, int pending __unused)
1487 * Add device for this primary channel.
1489 vmbus_add_child(xchan);
1493 vmbus_subchan_attach_task(void *xchan __unused, int pending __unused)
1500 vmbus_chan_destroy_all(struct vmbus_softc *sc)
1504 * Detach all devices and destroy the corresponding primary
1508 struct vmbus_channel *chan;
1510 mtx_lock(&sc->vmbus_chan_lock);
1511 TAILQ_FOREACH(chan, &sc->vmbus_chans, ch_link) {
1512 if (VMBUS_CHAN_ISPRIMARY(chan))
1516 /* No more primary channels; done. */
1517 mtx_unlock(&sc->vmbus_chan_lock);
1520 vmbus_chan_rem_list(sc, chan);
1521 mtx_unlock(&sc->vmbus_chan_lock);
1523 mtx_lock(&sc->vmbus_prichan_lock);
1524 vmbus_chan_rem_prilist(sc, chan);
1525 mtx_unlock(&sc->vmbus_prichan_lock);
1527 taskqueue_enqueue(chan->ch_mgmt_tq, &chan->ch_detach_task);
1532 * The channel whose vcpu binding is closest to the currect vcpu will
1534 * If no multi-channel, always select primary channel.
1536 struct vmbus_channel *
1537 vmbus_chan_cpu2chan(struct vmbus_channel *prichan, int cpu)
1539 struct vmbus_channel *sel, *chan;
1540 uint32_t vcpu, sel_dist;
1542 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpuid %d", cpu));
1543 if (TAILQ_EMPTY(&prichan->ch_subchans))
1546 vcpu = VMBUS_PCPU_GET(prichan->ch_vmbus, vcpuid, cpu);
1548 #define CHAN_VCPU_DIST(ch, vcpu) \
1549 (((ch)->ch_vcpuid > (vcpu)) ? \
1550 ((ch)->ch_vcpuid - (vcpu)) : ((vcpu) - (ch)->ch_vcpuid))
1552 #define CHAN_SELECT(ch) \
1555 sel_dist = CHAN_VCPU_DIST(ch, vcpu); \
1558 CHAN_SELECT(prichan);
1560 mtx_lock(&prichan->ch_subchan_lock);
1561 TAILQ_FOREACH(chan, &prichan->ch_subchans, ch_sublink) {
1564 KASSERT(chan->ch_stflags & VMBUS_CHAN_ST_OPENED,
1565 ("chan%u is not opened", chan->ch_id));
1567 if (chan->ch_vcpuid == vcpu) {
1568 /* Exact match; done */
1573 dist = CHAN_VCPU_DIST(chan, vcpu);
1574 if (sel_dist <= dist) {
1575 /* Far or same distance; skip */
1579 /* Select the closer channel. */
1582 mtx_unlock(&prichan->ch_subchan_lock);
1585 #undef CHAN_VCPU_DIST
1590 struct vmbus_channel **
1591 vmbus_subchan_get(struct vmbus_channel *pri_chan, int subchan_cnt)
1593 struct vmbus_channel **ret, *chan;
1596 KASSERT(subchan_cnt > 0, ("invalid sub-channel count %d", subchan_cnt));
1598 ret = malloc(subchan_cnt * sizeof(struct vmbus_channel *), M_TEMP,
1601 mtx_lock(&pri_chan->ch_subchan_lock);
1603 while (pri_chan->ch_subchan_cnt < subchan_cnt)
1604 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "subch", 0);
1607 TAILQ_FOREACH(chan, &pri_chan->ch_subchans, ch_sublink) {
1608 /* TODO: refcnt chan */
1612 if (i == subchan_cnt)
1615 KASSERT(i == subchan_cnt, ("invalid subchan count %d, should be %d",
1616 pri_chan->ch_subchan_cnt, subchan_cnt));
1618 mtx_unlock(&pri_chan->ch_subchan_lock);
1624 vmbus_subchan_rel(struct vmbus_channel **subchan, int subchan_cnt __unused)
1627 free(subchan, M_TEMP);
1631 vmbus_subchan_drain(struct vmbus_channel *pri_chan)
1633 mtx_lock(&pri_chan->ch_subchan_lock);
1634 while (pri_chan->ch_subchan_cnt > 0)
1635 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "dsubch", 0);
1636 mtx_unlock(&pri_chan->ch_subchan_lock);
1640 vmbus_chan_msgproc(struct vmbus_softc *sc, const struct vmbus_message *msg)
1642 vmbus_chanmsg_proc_t msg_proc;
1645 msg_type = ((const struct vmbus_chanmsg_hdr *)msg->msg_data)->chm_type;
1646 KASSERT(msg_type < VMBUS_CHANMSG_TYPE_MAX,
1647 ("invalid message type %u", msg_type));
1649 msg_proc = vmbus_chan_msgprocs[msg_type];
1650 if (msg_proc != NULL)
1655 vmbus_chan_set_readbatch(struct vmbus_channel *chan, bool on)
1658 chan->ch_flags &= ~VMBUS_CHAN_FLAG_BATCHREAD;
1660 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD;
1664 vmbus_chan_id(const struct vmbus_channel *chan)
1670 vmbus_chan_subidx(const struct vmbus_channel *chan)
1672 return chan->ch_subidx;
1676 vmbus_chan_is_primary(const struct vmbus_channel *chan)
1678 if (VMBUS_CHAN_ISPRIMARY(chan))
1684 const struct hyperv_guid *
1685 vmbus_chan_guid_inst(const struct vmbus_channel *chan)
1687 return &chan->ch_guid_inst;
1691 vmbus_chan_prplist_nelem(int br_size, int prpcnt_max, int dlen_max)
1695 elem_size = __offsetof(struct vmbus_chanpkt_prplist,
1696 cp_range[0].gpa_page[prpcnt_max]);
1697 elem_size += dlen_max;
1698 elem_size = VMBUS_CHANPKT_TOTLEN(elem_size);
1700 return (vmbus_br_nelem(br_size, elem_size));
1704 vmbus_chan_tx_empty(const struct vmbus_channel *chan)
1707 return (vmbus_txbr_empty(&chan->ch_txbr));
1711 vmbus_chan_rx_empty(const struct vmbus_channel *chan)
1714 return (vmbus_rxbr_empty(&chan->ch_rxbr));
1718 vmbus_chan_run_task(struct vmbus_channel *chan, struct task *task)
1721 taskqueue_enqueue(chan->ch_tq, task);
1722 taskqueue_drain(chan->ch_tq, task);