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>
34 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/mutex.h>
39 #include <sys/sysctl.h>
40 #include <sys/systm.h>
42 #include <machine/atomic.h>
43 #include <machine/stdarg.h>
45 #include <dev/hyperv/include/hyperv_busdma.h>
46 #include <dev/hyperv/vmbus/hyperv_var.h>
47 #include <dev/hyperv/vmbus/vmbus_reg.h>
48 #include <dev/hyperv/vmbus/vmbus_var.h>
49 #include <dev/hyperv/vmbus/vmbus_brvar.h>
50 #include <dev/hyperv/vmbus/vmbus_chanvar.h>
52 static void vmbus_chan_update_evtflagcnt(
54 const struct vmbus_channel *);
55 static void vmbus_chan_close_internal(
56 struct vmbus_channel *);
57 static int vmbus_chan_sysctl_mnf(SYSCTL_HANDLER_ARGS);
58 static void vmbus_chan_sysctl_create(
59 struct vmbus_channel *);
60 static struct vmbus_channel *vmbus_chan_alloc(struct vmbus_softc *);
61 static void vmbus_chan_free(struct vmbus_channel *);
62 static int vmbus_chan_add(struct vmbus_channel *);
63 static void vmbus_chan_cpu_default(struct vmbus_channel *);
64 static int vmbus_chan_release(struct vmbus_channel *);
65 static void vmbus_chan_set_chmap(struct vmbus_channel *);
66 static void vmbus_chan_clear_chmap(struct vmbus_channel *);
68 static void vmbus_chan_ins_prilist(struct vmbus_softc *,
69 struct vmbus_channel *);
70 static void vmbus_chan_rem_prilist(struct vmbus_softc *,
71 struct vmbus_channel *);
72 static void vmbus_chan_ins_list(struct vmbus_softc *,
73 struct vmbus_channel *);
74 static void vmbus_chan_rem_list(struct vmbus_softc *,
75 struct vmbus_channel *);
76 static void vmbus_chan_ins_sublist(struct vmbus_channel *,
77 struct vmbus_channel *);
78 static void vmbus_chan_rem_sublist(struct vmbus_channel *,
79 struct vmbus_channel *);
81 static void vmbus_chan_task(void *, int);
82 static void vmbus_chan_task_nobatch(void *, int);
83 static void vmbus_chan_clrchmap_task(void *, int);
84 static void vmbus_prichan_attach_task(void *, int);
85 static void vmbus_subchan_attach_task(void *, int);
86 static void vmbus_prichan_detach_task(void *, int);
87 static void vmbus_subchan_detach_task(void *, int);
89 static void vmbus_chan_msgproc_choffer(struct vmbus_softc *,
90 const struct vmbus_message *);
91 static void vmbus_chan_msgproc_chrescind(
93 const struct vmbus_message *);
95 static int vmbus_chan_printf(const struct vmbus_channel *,
96 const char *, ...) __printflike(2, 3);
99 * Vmbus channel message processing.
101 static const vmbus_chanmsg_proc_t
102 vmbus_chan_msgprocs[VMBUS_CHANMSG_TYPE_MAX] = {
103 VMBUS_CHANMSG_PROC(CHOFFER, vmbus_chan_msgproc_choffer),
104 VMBUS_CHANMSG_PROC(CHRESCIND, vmbus_chan_msgproc_chrescind),
106 VMBUS_CHANMSG_PROC_WAKEUP(CHOPEN_RESP),
107 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_CONNRESP),
108 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_DISCONNRESP)
112 * Notify host that there are data pending on our TX bufring.
115 vmbus_chan_signal_tx(const struct vmbus_channel *chan)
117 atomic_set_long(chan->ch_evtflag, chan->ch_evtflag_mask);
118 if (chan->ch_txflags & VMBUS_CHAN_TXF_HASMNF)
119 atomic_set_int(chan->ch_montrig, chan->ch_montrig_mask);
121 hypercall_signal_event(chan->ch_monprm_dma.hv_paddr);
125 vmbus_chan_ins_prilist(struct vmbus_softc *sc, struct vmbus_channel *chan)
128 mtx_assert(&sc->vmbus_prichan_lock, MA_OWNED);
129 if (atomic_testandset_int(&chan->ch_stflags,
130 VMBUS_CHAN_ST_ONPRIL_SHIFT))
131 panic("channel is already on the prilist");
132 TAILQ_INSERT_TAIL(&sc->vmbus_prichans, chan, ch_prilink);
136 vmbus_chan_rem_prilist(struct vmbus_softc *sc, struct vmbus_channel *chan)
139 mtx_assert(&sc->vmbus_prichan_lock, MA_OWNED);
140 if (atomic_testandclear_int(&chan->ch_stflags,
141 VMBUS_CHAN_ST_ONPRIL_SHIFT) == 0)
142 panic("channel is not on the prilist");
143 TAILQ_REMOVE(&sc->vmbus_prichans, chan, ch_prilink);
147 vmbus_chan_ins_sublist(struct vmbus_channel *prichan,
148 struct vmbus_channel *chan)
151 mtx_assert(&prichan->ch_subchan_lock, MA_OWNED);
153 if (atomic_testandset_int(&chan->ch_stflags,
154 VMBUS_CHAN_ST_ONSUBL_SHIFT))
155 panic("channel is already on the sublist");
156 TAILQ_INSERT_TAIL(&prichan->ch_subchans, chan, ch_sublink);
158 /* Bump sub-channel count. */
159 prichan->ch_subchan_cnt++;
163 vmbus_chan_rem_sublist(struct vmbus_channel *prichan,
164 struct vmbus_channel *chan)
167 mtx_assert(&prichan->ch_subchan_lock, MA_OWNED);
169 KASSERT(prichan->ch_subchan_cnt > 0,
170 ("invalid subchan_cnt %d", prichan->ch_subchan_cnt));
171 prichan->ch_subchan_cnt--;
173 if (atomic_testandclear_int(&chan->ch_stflags,
174 VMBUS_CHAN_ST_ONSUBL_SHIFT) == 0)
175 panic("channel is not on the sublist");
176 TAILQ_REMOVE(&prichan->ch_subchans, chan, ch_sublink);
180 vmbus_chan_ins_list(struct vmbus_softc *sc, struct vmbus_channel *chan)
183 mtx_assert(&sc->vmbus_chan_lock, MA_OWNED);
184 if (atomic_testandset_int(&chan->ch_stflags,
185 VMBUS_CHAN_ST_ONLIST_SHIFT))
186 panic("channel is already on the list");
187 TAILQ_INSERT_TAIL(&sc->vmbus_chans, chan, ch_link);
191 vmbus_chan_rem_list(struct vmbus_softc *sc, struct vmbus_channel *chan)
194 mtx_assert(&sc->vmbus_chan_lock, MA_OWNED);
195 if (atomic_testandclear_int(&chan->ch_stflags,
196 VMBUS_CHAN_ST_ONLIST_SHIFT) == 0)
197 panic("channel is not on the list");
198 TAILQ_REMOVE(&sc->vmbus_chans, chan, ch_link);
202 vmbus_chan_sysctl_mnf(SYSCTL_HANDLER_ARGS)
204 struct vmbus_channel *chan = arg1;
207 if (chan->ch_txflags & VMBUS_CHAN_TXF_HASMNF)
209 return sysctl_handle_int(oidp, &mnf, 0, req);
213 vmbus_chan_sysctl_create(struct vmbus_channel *chan)
215 struct sysctl_oid *ch_tree, *chid_tree, *br_tree;
216 struct sysctl_ctx_list *ctx;
221 * Add sysctl nodes related to this channel to this
222 * channel's sysctl ctx, so that they can be destroyed
223 * independently upon close of this channel, which can
224 * happen even if the device is not detached.
226 ctx = &chan->ch_sysctl_ctx;
227 sysctl_ctx_init(ctx);
230 * Create dev.NAME.UNIT.channel tree.
232 ch_tree = SYSCTL_ADD_NODE(ctx,
233 SYSCTL_CHILDREN(device_get_sysctl_tree(chan->ch_dev)),
234 OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
239 * Create dev.NAME.UNIT.channel.CHANID tree.
241 if (VMBUS_CHAN_ISPRIMARY(chan))
244 ch_id = chan->ch_prichan->ch_id;
245 snprintf(name, sizeof(name), "%d", ch_id);
246 chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree),
247 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
248 if (chid_tree == NULL)
251 if (!VMBUS_CHAN_ISPRIMARY(chan)) {
253 * Create dev.NAME.UNIT.channel.CHANID.sub tree.
255 ch_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree),
256 OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
261 * Create dev.NAME.UNIT.channel.CHANID.sub.SUBIDX tree.
264 * chid_tree is changed to this new sysctl tree.
266 snprintf(name, sizeof(name), "%d", chan->ch_subidx);
267 chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree),
268 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
269 if (chid_tree == NULL)
272 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO,
273 "chanid", CTLFLAG_RD, &chan->ch_id, 0, "channel id");
276 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO,
277 "cpu", CTLFLAG_RD, &chan->ch_cpuid, 0, "owner CPU id");
278 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO,
279 "mnf", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
280 chan, 0, vmbus_chan_sysctl_mnf, "I",
281 "has monitor notification facilities");
283 br_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO,
284 "br", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
285 if (br_tree != NULL) {
287 * Create sysctl tree for RX bufring.
289 vmbus_br_sysctl_create(ctx, br_tree, &chan->ch_rxbr.rxbr, "rx");
291 * Create sysctl tree for TX bufring.
293 vmbus_br_sysctl_create(ctx, br_tree, &chan->ch_txbr.txbr, "tx");
298 vmbus_chan_open(struct vmbus_channel *chan, int txbr_size, int rxbr_size,
299 const void *udata, int udlen, vmbus_chan_callback_t cb, void *cbarg)
301 struct vmbus_chan_br cbr;
305 * Allocate the TX+RX bufrings.
307 KASSERT(chan->ch_bufring == NULL, ("bufrings are allocated"));
308 chan->ch_bufring = hyperv_dmamem_alloc(bus_get_dma_tag(chan->ch_dev),
309 PAGE_SIZE, 0, txbr_size + rxbr_size, &chan->ch_bufring_dma,
311 if (chan->ch_bufring == NULL) {
312 vmbus_chan_printf(chan, "bufring allocation failed\n");
316 cbr.cbr = chan->ch_bufring;
317 cbr.cbr_paddr = chan->ch_bufring_dma.hv_paddr;
318 cbr.cbr_txsz = txbr_size;
319 cbr.cbr_rxsz = rxbr_size;
321 error = vmbus_chan_open_br(chan, &cbr, udata, udlen, cb, cbarg);
323 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring);
324 chan->ch_bufring = NULL;
330 vmbus_chan_open_br(struct vmbus_channel *chan, const struct vmbus_chan_br *cbr,
331 const void *udata, int udlen, vmbus_chan_callback_t cb, void *cbarg)
333 struct vmbus_softc *sc = chan->ch_vmbus;
334 const struct vmbus_chanmsg_chopen_resp *resp;
335 const struct vmbus_message *msg;
336 struct vmbus_chanmsg_chopen *req;
337 struct vmbus_msghc *mh;
339 int error, txbr_size, rxbr_size;
343 if (udlen > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) {
344 vmbus_chan_printf(chan,
345 "invalid udata len %d for chan%u\n", udlen, chan->ch_id);
350 txbr_size = cbr->cbr_txsz;
351 rxbr_size = cbr->cbr_rxsz;
352 KASSERT((txbr_size & PAGE_MASK) == 0,
353 ("send bufring size is not multiple page"));
354 KASSERT((rxbr_size & PAGE_MASK) == 0,
355 ("recv bufring size is not multiple page"));
356 KASSERT((cbr->cbr_paddr & PAGE_MASK) == 0,
357 ("bufring is not page aligned"));
360 * Zero out the TX/RX bufrings, in case that they were used before.
362 memset(br, 0, txbr_size + rxbr_size);
364 if (atomic_testandset_int(&chan->ch_stflags,
365 VMBUS_CHAN_ST_OPENED_SHIFT))
366 panic("double-open chan%u", chan->ch_id);
369 chan->ch_cbarg = cbarg;
371 vmbus_chan_update_evtflagcnt(sc, chan);
373 chan->ch_tq = VMBUS_PCPU_GET(chan->ch_vmbus, event_tq, chan->ch_cpuid);
374 if (chan->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD)
375 task_fn = vmbus_chan_task;
377 task_fn = vmbus_chan_task_nobatch;
378 TASK_INIT(&chan->ch_task, 0, task_fn, chan);
380 /* TX bufring comes first */
381 vmbus_txbr_setup(&chan->ch_txbr, br, txbr_size);
382 /* RX bufring immediately follows TX bufring */
383 vmbus_rxbr_setup(&chan->ch_rxbr, br + txbr_size, rxbr_size);
385 /* Create sysctl tree for this channel */
386 vmbus_chan_sysctl_create(chan);
389 * Connect the bufrings, both RX and TX, to this channel.
391 error = vmbus_chan_gpadl_connect(chan, cbr->cbr_paddr,
392 txbr_size + rxbr_size, &chan->ch_bufring_gpadl);
394 vmbus_chan_printf(chan,
395 "failed to connect bufring GPADL to chan%u\n", chan->ch_id);
400 * Install this channel, before it is opened, but after everything
401 * else has been setup.
403 vmbus_chan_set_chmap(chan);
406 * Open channel w/ the bufring GPADL on the target CPU.
408 mh = vmbus_msghc_get(sc, sizeof(*req));
410 vmbus_chan_printf(chan,
411 "can not get msg hypercall for chopen(chan%u)\n",
417 req = vmbus_msghc_dataptr(mh);
418 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN;
419 req->chm_chanid = chan->ch_id;
420 req->chm_openid = chan->ch_id;
421 req->chm_gpadl = chan->ch_bufring_gpadl;
422 req->chm_vcpuid = chan->ch_vcpuid;
423 req->chm_txbr_pgcnt = txbr_size >> PAGE_SHIFT;
425 memcpy(req->chm_udata, udata, udlen);
427 error = vmbus_msghc_exec(sc, mh);
429 vmbus_chan_printf(chan,
430 "chopen(chan%u) msg hypercall exec failed: %d\n",
432 vmbus_msghc_put(sc, mh);
436 msg = vmbus_msghc_wait_result(sc, mh);
437 resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data;
438 status = resp->chm_status;
440 vmbus_msghc_put(sc, mh);
444 vmbus_chan_printf(chan, "chan%u opened\n", chan->ch_id);
449 vmbus_chan_printf(chan, "failed to open chan%u\n", chan->ch_id);
453 vmbus_chan_clear_chmap(chan);
454 if (chan->ch_bufring_gpadl) {
455 vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl);
456 chan->ch_bufring_gpadl = 0;
458 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED);
463 vmbus_chan_gpadl_connect(struct vmbus_channel *chan, bus_addr_t paddr,
464 int size, uint32_t *gpadl0)
466 struct vmbus_softc *sc = chan->ch_vmbus;
467 struct vmbus_msghc *mh;
468 struct vmbus_chanmsg_gpadl_conn *req;
469 const struct vmbus_message *msg;
471 uint32_t gpadl, status;
472 int page_count, range_len, i, cnt, error;
476 * Preliminary checks.
479 KASSERT((size & PAGE_MASK) == 0,
480 ("invalid GPA size %d, not multiple page size", size));
481 page_count = size >> PAGE_SHIFT;
483 KASSERT((paddr & PAGE_MASK) == 0,
484 ("GPA is not page aligned %jx", (uintmax_t)paddr));
485 page_id = paddr >> PAGE_SHIFT;
487 range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]);
489 * We don't support multiple GPA ranges.
491 if (range_len > UINT16_MAX) {
492 vmbus_chan_printf(chan, "GPA too large, %d pages\n",
500 gpadl = vmbus_gpadl_alloc(sc);
504 * Connect this GPADL to the target channel.
507 * Since each message can only hold small set of page
508 * addresses, several messages may be required to
509 * complete the connection.
511 if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX)
512 cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX;
517 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn,
518 chm_range.gpa_page[cnt]);
519 mh = vmbus_msghc_get(sc, reqsz);
521 vmbus_chan_printf(chan,
522 "can not get msg hypercall for gpadl_conn(chan%u)\n",
527 req = vmbus_msghc_dataptr(mh);
528 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN;
529 req->chm_chanid = chan->ch_id;
530 req->chm_gpadl = gpadl;
531 req->chm_range_len = range_len;
532 req->chm_range_cnt = 1;
533 req->chm_range.gpa_len = size;
534 req->chm_range.gpa_ofs = 0;
535 for (i = 0; i < cnt; ++i)
536 req->chm_range.gpa_page[i] = page_id++;
538 error = vmbus_msghc_exec(sc, mh);
540 vmbus_chan_printf(chan,
541 "gpadl_conn(chan%u) msg hypercall exec failed: %d\n",
543 vmbus_msghc_put(sc, mh);
547 while (page_count > 0) {
548 struct vmbus_chanmsg_gpadl_subconn *subreq;
550 if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX)
551 cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX;
556 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn,
558 vmbus_msghc_reset(mh, reqsz);
560 subreq = vmbus_msghc_dataptr(mh);
561 subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN;
562 subreq->chm_gpadl = gpadl;
563 for (i = 0; i < cnt; ++i)
564 subreq->chm_gpa_page[i] = page_id++;
566 vmbus_msghc_exec_noresult(mh);
568 KASSERT(page_count == 0, ("invalid page count %d", page_count));
570 msg = vmbus_msghc_wait_result(sc, mh);
571 status = ((const struct vmbus_chanmsg_gpadl_connresp *)
572 msg->msg_data)->chm_status;
574 vmbus_msghc_put(sc, mh);
577 vmbus_chan_printf(chan, "gpadl_conn(chan%u) failed: %u\n",
578 chan->ch_id, status);
582 vmbus_chan_printf(chan,
583 "gpadl_conn(chan%u) succeeded\n", chan->ch_id);
590 * Disconnect the GPA from the target channel
593 vmbus_chan_gpadl_disconnect(struct vmbus_channel *chan, uint32_t gpadl)
595 struct vmbus_softc *sc = chan->ch_vmbus;
596 struct vmbus_msghc *mh;
597 struct vmbus_chanmsg_gpadl_disconn *req;
600 mh = vmbus_msghc_get(sc, sizeof(*req));
602 vmbus_chan_printf(chan,
603 "can not get msg hypercall for gpadl_disconn(chan%u)\n",
608 req = vmbus_msghc_dataptr(mh);
609 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN;
610 req->chm_chanid = chan->ch_id;
611 req->chm_gpadl = gpadl;
613 error = vmbus_msghc_exec(sc, mh);
615 vmbus_chan_printf(chan,
616 "gpadl_disconn(chan%u) msg hypercall exec failed: %d\n",
618 vmbus_msghc_put(sc, mh);
622 vmbus_msghc_wait_result(sc, mh);
623 /* Discard result; no useful information */
624 vmbus_msghc_put(sc, mh);
630 vmbus_chan_clrchmap_task(void *xchan, int pending __unused)
632 struct vmbus_channel *chan = xchan;
635 chan->ch_vmbus->vmbus_chmap[chan->ch_id] = NULL;
640 vmbus_chan_clear_chmap(struct vmbus_channel *chan)
642 struct task chmap_task;
644 TASK_INIT(&chmap_task, 0, vmbus_chan_clrchmap_task, chan);
645 taskqueue_enqueue(chan->ch_tq, &chmap_task);
646 taskqueue_drain(chan->ch_tq, &chmap_task);
650 vmbus_chan_set_chmap(struct vmbus_channel *chan)
653 chan->ch_vmbus->vmbus_chmap[chan->ch_id] = chan;
657 vmbus_chan_close_internal(struct vmbus_channel *chan)
659 struct vmbus_softc *sc = chan->ch_vmbus;
660 struct vmbus_msghc *mh;
661 struct vmbus_chanmsg_chclose *req;
664 /* TODO: stringent check */
665 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED);
668 * Free this channel's sysctl tree attached to its device's
671 sysctl_ctx_free(&chan->ch_sysctl_ctx);
675 * Order is critical. This channel _must_ be uninstalled first,
676 * else the channel task may be enqueued by the IDT after it has
679 vmbus_chan_clear_chmap(chan);
680 taskqueue_drain(chan->ch_tq, &chan->ch_task);
684 * Close this channel.
686 mh = vmbus_msghc_get(sc, sizeof(*req));
688 vmbus_chan_printf(chan,
689 "can not get msg hypercall for chclose(chan%u)\n",
694 req = vmbus_msghc_dataptr(mh);
695 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE;
696 req->chm_chanid = chan->ch_id;
698 error = vmbus_msghc_exec_noresult(mh);
699 vmbus_msghc_put(sc, mh);
702 vmbus_chan_printf(chan,
703 "chclose(chan%u) msg hypercall exec failed: %d\n",
706 } else if (bootverbose) {
707 vmbus_chan_printf(chan, "close chan%u\n", chan->ch_id);
711 * Disconnect the TX+RX bufrings from this channel.
713 if (chan->ch_bufring_gpadl) {
714 vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl);
715 chan->ch_bufring_gpadl = 0;
719 * Destroy the TX+RX bufrings.
721 if (chan->ch_bufring != NULL) {
722 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring);
723 chan->ch_bufring = NULL;
728 * Caller should make sure that all sub-channels have
729 * been added to 'chan' and all to-be-closed channels
730 * are not being opened.
733 vmbus_chan_close(struct vmbus_channel *chan)
737 if (!VMBUS_CHAN_ISPRIMARY(chan)) {
739 * Sub-channel is closed when its primary channel
746 * Close all sub-channels, if any.
748 subchan_cnt = chan->ch_subchan_cnt;
749 if (subchan_cnt > 0) {
750 struct vmbus_channel **subchan;
753 subchan = vmbus_subchan_get(chan, subchan_cnt);
754 for (i = 0; i < subchan_cnt; ++i)
755 vmbus_chan_close_internal(subchan[i]);
756 vmbus_subchan_rel(subchan, subchan_cnt);
759 /* Then close the primary channel. */
760 vmbus_chan_close_internal(chan);
764 vmbus_chan_intr_drain(struct vmbus_channel *chan)
767 taskqueue_drain(chan->ch_tq, &chan->ch_task);
771 vmbus_chan_send(struct vmbus_channel *chan, uint16_t type, uint16_t flags,
772 void *data, int dlen, uint64_t xactid)
774 struct vmbus_chanpkt pkt;
775 int pktlen, pad_pktlen, hlen, error;
781 pktlen = hlen + dlen;
782 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen);
783 KASSERT(pad_pktlen <= vmbus_txbr_maxpktsz(&chan->ch_txbr),
784 ("invalid packet size %d", pad_pktlen));
786 pkt.cp_hdr.cph_type = type;
787 pkt.cp_hdr.cph_flags = flags;
788 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen);
789 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen);
790 pkt.cp_hdr.cph_xactid = xactid;
792 iov[0].iov_base = &pkt;
793 iov[0].iov_len = hlen;
794 iov[1].iov_base = data;
795 iov[1].iov_len = dlen;
796 iov[2].iov_base = &pad;
797 iov[2].iov_len = pad_pktlen - pktlen;
799 error = vmbus_txbr_write(&chan->ch_txbr, iov, 3, &send_evt);
800 if (!error && send_evt)
801 vmbus_chan_signal_tx(chan);
806 vmbus_chan_send_sglist(struct vmbus_channel *chan,
807 struct vmbus_gpa sg[], int sglen, void *data, int dlen, uint64_t xactid)
809 struct vmbus_chanpkt_sglist pkt;
810 int pktlen, pad_pktlen, hlen, error;
815 hlen = __offsetof(struct vmbus_chanpkt_sglist, cp_gpa[sglen]);
816 pktlen = hlen + dlen;
817 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen);
818 KASSERT(pad_pktlen <= vmbus_txbr_maxpktsz(&chan->ch_txbr),
819 ("invalid packet size %d", pad_pktlen));
821 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA;
822 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC;
823 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen);
824 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen);
825 pkt.cp_hdr.cph_xactid = xactid;
827 pkt.cp_gpa_cnt = sglen;
829 iov[0].iov_base = &pkt;
830 iov[0].iov_len = sizeof(pkt);
831 iov[1].iov_base = sg;
832 iov[1].iov_len = sizeof(struct vmbus_gpa) * sglen;
833 iov[2].iov_base = data;
834 iov[2].iov_len = dlen;
835 iov[3].iov_base = &pad;
836 iov[3].iov_len = pad_pktlen - pktlen;
838 error = vmbus_txbr_write(&chan->ch_txbr, iov, 4, &send_evt);
839 if (!error && send_evt)
840 vmbus_chan_signal_tx(chan);
845 vmbus_chan_send_prplist(struct vmbus_channel *chan,
846 struct vmbus_gpa_range *prp, int prp_cnt, void *data, int dlen,
849 struct vmbus_chanpkt_prplist pkt;
850 int pktlen, pad_pktlen, hlen, error;
855 hlen = __offsetof(struct vmbus_chanpkt_prplist,
856 cp_range[0].gpa_page[prp_cnt]);
857 pktlen = hlen + dlen;
858 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen);
859 KASSERT(pad_pktlen <= vmbus_txbr_maxpktsz(&chan->ch_txbr),
860 ("invalid packet size %d", pad_pktlen));
862 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA;
863 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC;
864 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen);
865 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen);
866 pkt.cp_hdr.cph_xactid = xactid;
868 pkt.cp_range_cnt = 1;
870 iov[0].iov_base = &pkt;
871 iov[0].iov_len = sizeof(pkt);
872 iov[1].iov_base = prp;
873 iov[1].iov_len = __offsetof(struct vmbus_gpa_range, gpa_page[prp_cnt]);
874 iov[2].iov_base = data;
875 iov[2].iov_len = dlen;
876 iov[3].iov_base = &pad;
877 iov[3].iov_len = pad_pktlen - pktlen;
879 error = vmbus_txbr_write(&chan->ch_txbr, iov, 4, &send_evt);
880 if (!error && send_evt)
881 vmbus_chan_signal_tx(chan);
886 vmbus_chan_recv(struct vmbus_channel *chan, void *data, int *dlen0,
889 struct vmbus_chanpkt_hdr pkt;
890 int error, dlen, hlen;
892 error = vmbus_rxbr_peek(&chan->ch_rxbr, &pkt, sizeof(pkt));
896 if (__predict_false(pkt.cph_hlen < VMBUS_CHANPKT_HLEN_MIN)) {
897 vmbus_chan_printf(chan, "invalid hlen %u\n", pkt.cph_hlen);
898 /* XXX this channel is dead actually. */
901 if (__predict_false(pkt.cph_hlen > pkt.cph_tlen)) {
902 vmbus_chan_printf(chan, "invalid hlen %u and tlen %u\n",
903 pkt.cph_hlen, pkt.cph_tlen);
904 /* XXX this channel is dead actually. */
908 hlen = VMBUS_CHANPKT_GETLEN(pkt.cph_hlen);
909 dlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen) - hlen;
912 /* Return the size of this packet's data. */
917 *xactid = pkt.cph_xactid;
920 /* Skip packet header */
921 error = vmbus_rxbr_read(&chan->ch_rxbr, data, dlen, hlen);
922 KASSERT(!error, ("vmbus_rxbr_read failed"));
928 vmbus_chan_recv_pkt(struct vmbus_channel *chan,
929 struct vmbus_chanpkt_hdr *pkt0, int *pktlen0)
931 struct vmbus_chanpkt_hdr pkt;
934 error = vmbus_rxbr_peek(&chan->ch_rxbr, &pkt, sizeof(pkt));
938 if (__predict_false(pkt.cph_hlen < VMBUS_CHANPKT_HLEN_MIN)) {
939 vmbus_chan_printf(chan, "invalid hlen %u\n", pkt.cph_hlen);
940 /* XXX this channel is dead actually. */
943 if (__predict_false(pkt.cph_hlen > pkt.cph_tlen)) {
944 vmbus_chan_printf(chan, "invalid hlen %u and tlen %u\n",
945 pkt.cph_hlen, pkt.cph_tlen);
946 /* XXX this channel is dead actually. */
950 pktlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen);
951 if (*pktlen0 < pktlen) {
952 /* Return the size of this packet. */
958 /* Include packet header */
959 error = vmbus_rxbr_read(&chan->ch_rxbr, pkt0, pktlen, 0);
960 KASSERT(!error, ("vmbus_rxbr_read failed"));
966 vmbus_chan_task(void *xchan, int pending __unused)
968 struct vmbus_channel *chan = xchan;
969 vmbus_chan_callback_t cb = chan->ch_cb;
970 void *cbarg = chan->ch_cbarg;
973 * Optimize host to guest signaling by ensuring:
974 * 1. While reading the channel, we disable interrupts from
976 * 2. Ensure that we process all posted messages from the host
977 * before returning from this callback.
978 * 3. Once we return, enable signaling from the host. Once this
979 * state is set we check to see if additional packets are
980 * available to read. In this case we repeat the process.
982 * NOTE: Interrupt has been disabled in the ISR.
989 left = vmbus_rxbr_intr_unmask(&chan->ch_rxbr);
991 /* No more data in RX bufring; done */
994 vmbus_rxbr_intr_mask(&chan->ch_rxbr);
999 vmbus_chan_task_nobatch(void *xchan, int pending __unused)
1001 struct vmbus_channel *chan = xchan;
1003 chan->ch_cb(chan, chan->ch_cbarg);
1006 static __inline void
1007 vmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags,
1012 for (f = 0; f < flag_cnt; ++f) {
1017 if (event_flags[f] == 0)
1020 flags = atomic_swap_long(&event_flags[f], 0);
1021 chid_base = f << VMBUS_EVTFLAG_SHIFT;
1023 while ((chid_ofs = ffsl(flags)) != 0) {
1024 struct vmbus_channel *chan;
1026 --chid_ofs; /* NOTE: ffsl is 1-based */
1027 flags &= ~(1UL << chid_ofs);
1029 chan = sc->vmbus_chmap[chid_base + chid_ofs];
1030 if (__predict_false(chan == NULL)) {
1031 /* Channel is closed. */
1034 __compiler_membar();
1036 if (chan->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD)
1037 vmbus_rxbr_intr_mask(&chan->ch_rxbr);
1038 taskqueue_enqueue(chan->ch_tq, &chan->ch_task);
1044 vmbus_event_proc(struct vmbus_softc *sc, int cpu)
1046 struct vmbus_evtflags *eventf;
1049 * On Host with Win8 or above, the event page can be checked directly
1050 * to get the id of the channel that has the pending interrupt.
1052 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE;
1053 vmbus_event_flags_proc(sc, eventf->evt_flags,
1054 VMBUS_PCPU_GET(sc, event_flags_cnt, cpu));
1058 vmbus_event_proc_compat(struct vmbus_softc *sc, int cpu)
1060 struct vmbus_evtflags *eventf;
1062 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE;
1063 if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) {
1064 vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags,
1065 VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT);
1070 vmbus_chan_update_evtflagcnt(struct vmbus_softc *sc,
1071 const struct vmbus_channel *chan)
1073 volatile int *flag_cnt_ptr;
1076 flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1;
1077 flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->ch_cpuid);
1082 old_flag_cnt = *flag_cnt_ptr;
1083 if (old_flag_cnt >= flag_cnt)
1085 if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) {
1087 vmbus_chan_printf(chan,
1088 "chan%u update cpu%d flag_cnt to %d\n",
1089 chan->ch_id, chan->ch_cpuid, flag_cnt);
1096 static struct vmbus_channel *
1097 vmbus_chan_alloc(struct vmbus_softc *sc)
1099 struct vmbus_channel *chan;
1101 chan = malloc(sizeof(*chan), M_DEVBUF, M_WAITOK | M_ZERO);
1103 chan->ch_monprm = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev),
1104 HYPERCALL_PARAM_ALIGN, 0, sizeof(struct hyperv_mon_param),
1105 &chan->ch_monprm_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO);
1106 if (chan->ch_monprm == NULL) {
1107 device_printf(sc->vmbus_dev, "monprm alloc failed\n");
1108 free(chan, M_DEVBUF);
1112 chan->ch_vmbus = sc;
1113 mtx_init(&chan->ch_subchan_lock, "vmbus subchan", NULL, MTX_DEF);
1114 TAILQ_INIT(&chan->ch_subchans);
1115 vmbus_rxbr_init(&chan->ch_rxbr);
1116 vmbus_txbr_init(&chan->ch_txbr);
1122 vmbus_chan_free(struct vmbus_channel *chan)
1125 KASSERT(TAILQ_EMPTY(&chan->ch_subchans) && chan->ch_subchan_cnt == 0,
1126 ("still owns sub-channels"));
1127 KASSERT((chan->ch_stflags &
1128 (VMBUS_CHAN_ST_OPENED |
1129 VMBUS_CHAN_ST_ONPRIL |
1130 VMBUS_CHAN_ST_ONSUBL |
1131 VMBUS_CHAN_ST_ONLIST)) == 0, ("free busy channel"));
1132 hyperv_dmamem_free(&chan->ch_monprm_dma, chan->ch_monprm);
1133 mtx_destroy(&chan->ch_subchan_lock);
1134 vmbus_rxbr_deinit(&chan->ch_rxbr);
1135 vmbus_txbr_deinit(&chan->ch_txbr);
1136 free(chan, M_DEVBUF);
1140 vmbus_chan_add(struct vmbus_channel *newchan)
1142 struct vmbus_softc *sc = newchan->ch_vmbus;
1143 struct vmbus_channel *prichan;
1145 if (newchan->ch_id == 0) {
1148 * Chan0 will neither be processed nor should be offered;
1151 device_printf(sc->vmbus_dev, "got chan0 offer, discard\n");
1153 } else if (newchan->ch_id >= VMBUS_CHAN_MAX) {
1154 device_printf(sc->vmbus_dev, "invalid chan%u offer\n",
1159 mtx_lock(&sc->vmbus_prichan_lock);
1160 TAILQ_FOREACH(prichan, &sc->vmbus_prichans, ch_prilink) {
1162 * Sub-channel will have the same type GUID and instance
1163 * GUID as its primary channel.
1165 if (memcmp(&prichan->ch_guid_type, &newchan->ch_guid_type,
1166 sizeof(struct hyperv_guid)) == 0 &&
1167 memcmp(&prichan->ch_guid_inst, &newchan->ch_guid_inst,
1168 sizeof(struct hyperv_guid)) == 0)
1171 if (VMBUS_CHAN_ISPRIMARY(newchan)) {
1172 if (prichan == NULL) {
1173 /* Install the new primary channel */
1174 vmbus_chan_ins_prilist(sc, newchan);
1175 mtx_unlock(&sc->vmbus_prichan_lock);
1178 mtx_unlock(&sc->vmbus_prichan_lock);
1179 device_printf(sc->vmbus_dev,
1180 "duplicated primary chan%u\n", newchan->ch_id);
1183 } else { /* Sub-channel */
1184 if (prichan == NULL) {
1185 mtx_unlock(&sc->vmbus_prichan_lock);
1186 device_printf(sc->vmbus_dev,
1187 "no primary chan for chan%u\n", newchan->ch_id);
1191 * Found the primary channel for this sub-channel and
1194 * XXX refcnt prichan
1197 mtx_unlock(&sc->vmbus_prichan_lock);
1200 * This is a sub-channel; link it with the primary channel.
1202 KASSERT(!VMBUS_CHAN_ISPRIMARY(newchan),
1203 ("new channel is not sub-channel"));
1204 KASSERT(prichan != NULL, ("no primary channel"));
1206 newchan->ch_prichan = prichan;
1207 newchan->ch_dev = prichan->ch_dev;
1209 mtx_lock(&prichan->ch_subchan_lock);
1210 vmbus_chan_ins_sublist(prichan, newchan);
1211 mtx_unlock(&prichan->ch_subchan_lock);
1213 * Notify anyone that is interested in this sub-channel,
1214 * after this sub-channel is setup.
1219 * Hook this channel up for later rescind.
1221 mtx_lock(&sc->vmbus_chan_lock);
1222 vmbus_chan_ins_list(sc, newchan);
1223 mtx_unlock(&sc->vmbus_chan_lock);
1226 vmbus_chan_printf(newchan, "chan%u subidx%u offer\n",
1227 newchan->ch_id, newchan->ch_subidx);
1230 /* Select default cpu for this channel. */
1231 vmbus_chan_cpu_default(newchan);
1237 vmbus_chan_cpu_set(struct vmbus_channel *chan, int cpu)
1239 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpu %d", cpu));
1241 if (chan->ch_vmbus->vmbus_version == VMBUS_VERSION_WS2008 ||
1242 chan->ch_vmbus->vmbus_version == VMBUS_VERSION_WIN7) {
1243 /* Only cpu0 is supported */
1247 chan->ch_cpuid = cpu;
1248 chan->ch_vcpuid = VMBUS_PCPU_GET(chan->ch_vmbus, vcpuid, cpu);
1251 vmbus_chan_printf(chan,
1252 "chan%u assigned to cpu%u [vcpu%u]\n",
1253 chan->ch_id, chan->ch_cpuid, chan->ch_vcpuid);
1258 vmbus_chan_cpu_rr(struct vmbus_channel *chan)
1260 static uint32_t vmbus_chan_nextcpu;
1263 cpu = atomic_fetchadd_int(&vmbus_chan_nextcpu, 1) % mp_ncpus;
1264 vmbus_chan_cpu_set(chan, cpu);
1268 vmbus_chan_cpu_default(struct vmbus_channel *chan)
1271 * By default, pin the channel to cpu0. Devices having
1272 * special channel-cpu mapping requirement should call
1273 * vmbus_chan_cpu_{set,rr}().
1275 vmbus_chan_cpu_set(chan, 0);
1279 vmbus_chan_msgproc_choffer(struct vmbus_softc *sc,
1280 const struct vmbus_message *msg)
1282 const struct vmbus_chanmsg_choffer *offer;
1283 struct vmbus_channel *chan;
1284 task_fn_t *detach_fn, *attach_fn;
1287 offer = (const struct vmbus_chanmsg_choffer *)msg->msg_data;
1289 chan = vmbus_chan_alloc(sc);
1291 device_printf(sc->vmbus_dev, "allocate chan%u failed\n",
1296 chan->ch_id = offer->chm_chanid;
1297 chan->ch_subidx = offer->chm_subidx;
1298 chan->ch_guid_type = offer->chm_chtype;
1299 chan->ch_guid_inst = offer->chm_chinst;
1301 /* Batch reading is on by default */
1302 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD;
1304 chan->ch_monprm->mp_connid = VMBUS_CONNID_EVENT;
1305 if (sc->vmbus_version != VMBUS_VERSION_WS2008)
1306 chan->ch_monprm->mp_connid = offer->chm_connid;
1308 if (offer->chm_flags1 & VMBUS_CHOFFER_FLAG1_HASMNF) {
1314 chan->ch_txflags |= VMBUS_CHAN_TXF_HASMNF;
1316 trig_idx = offer->chm_montrig / VMBUS_MONTRIG_LEN;
1317 if (trig_idx >= VMBUS_MONTRIGS_MAX)
1318 panic("invalid monitor trigger %u", offer->chm_montrig);
1320 &sc->vmbus_mnf2->mnf_trigs[trig_idx].mt_pending;
1322 chan->ch_montrig_mask =
1323 1 << (offer->chm_montrig % VMBUS_MONTRIG_LEN);
1330 &sc->vmbus_tx_evtflags[chan->ch_id >> VMBUS_EVTFLAG_SHIFT];
1331 chan->ch_evtflag_mask = 1UL << (chan->ch_id & VMBUS_EVTFLAG_MASK);
1334 * Setup attach and detach tasks.
1336 if (VMBUS_CHAN_ISPRIMARY(chan)) {
1337 chan->ch_mgmt_tq = sc->vmbus_devtq;
1338 attach_fn = vmbus_prichan_attach_task;
1339 detach_fn = vmbus_prichan_detach_task;
1341 chan->ch_mgmt_tq = sc->vmbus_subchtq;
1342 attach_fn = vmbus_subchan_attach_task;
1343 detach_fn = vmbus_subchan_detach_task;
1345 TASK_INIT(&chan->ch_attach_task, 0, attach_fn, chan);
1346 TASK_INIT(&chan->ch_detach_task, 0, detach_fn, chan);
1348 error = vmbus_chan_add(chan);
1350 device_printf(sc->vmbus_dev, "add chan%u failed: %d\n",
1351 chan->ch_id, error);
1352 vmbus_chan_free(chan);
1355 taskqueue_enqueue(chan->ch_mgmt_tq, &chan->ch_attach_task);
1359 vmbus_chan_msgproc_chrescind(struct vmbus_softc *sc,
1360 const struct vmbus_message *msg)
1362 const struct vmbus_chanmsg_chrescind *note;
1363 struct vmbus_channel *chan;
1365 note = (const struct vmbus_chanmsg_chrescind *)msg->msg_data;
1366 if (note->chm_chanid > VMBUS_CHAN_MAX) {
1367 device_printf(sc->vmbus_dev, "invalid rescinded chan%u\n",
1373 * Find and remove the target channel from the channel list.
1375 mtx_lock(&sc->vmbus_chan_lock);
1376 TAILQ_FOREACH(chan, &sc->vmbus_chans, ch_link) {
1377 if (chan->ch_id == note->chm_chanid)
1381 mtx_unlock(&sc->vmbus_chan_lock);
1382 device_printf(sc->vmbus_dev, "chan%u is not offered\n",
1386 vmbus_chan_rem_list(sc, chan);
1387 mtx_unlock(&sc->vmbus_chan_lock);
1389 if (VMBUS_CHAN_ISPRIMARY(chan)) {
1391 * The target channel is a primary channel; remove the
1392 * target channel from the primary channel list now,
1393 * instead of later, so that it will not be found by
1394 * other sub-channel offers, which are processed in
1397 mtx_lock(&sc->vmbus_prichan_lock);
1398 vmbus_chan_rem_prilist(sc, chan);
1399 mtx_unlock(&sc->vmbus_prichan_lock);
1403 vmbus_chan_printf(chan, "chan%u rescinded\n", note->chm_chanid);
1405 /* Detach the target channel. */
1406 taskqueue_enqueue(chan->ch_mgmt_tq, &chan->ch_detach_task);
1410 vmbus_chan_release(struct vmbus_channel *chan)
1412 struct vmbus_softc *sc = chan->ch_vmbus;
1413 struct vmbus_chanmsg_chfree *req;
1414 struct vmbus_msghc *mh;
1417 mh = vmbus_msghc_get(sc, sizeof(*req));
1419 vmbus_chan_printf(chan,
1420 "can not get msg hypercall for chfree(chan%u)\n",
1425 req = vmbus_msghc_dataptr(mh);
1426 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHFREE;
1427 req->chm_chanid = chan->ch_id;
1429 error = vmbus_msghc_exec_noresult(mh);
1430 vmbus_msghc_put(sc, mh);
1433 vmbus_chan_printf(chan,
1434 "chfree(chan%u) msg hypercall exec failed: %d\n",
1435 chan->ch_id, error);
1438 vmbus_chan_printf(chan, "chan%u freed\n", chan->ch_id);
1444 vmbus_prichan_detach_task(void *xchan, int pending __unused)
1446 struct vmbus_channel *chan = xchan;
1448 KASSERT(VMBUS_CHAN_ISPRIMARY(chan),
1449 ("chan%u is not primary channel", chan->ch_id));
1451 /* Delete and detach the device associated with this channel. */
1452 vmbus_delete_child(chan);
1454 /* Release this channel (back to vmbus). */
1455 vmbus_chan_release(chan);
1457 /* Free this channel's resource. */
1458 vmbus_chan_free(chan);
1462 vmbus_subchan_detach_task(void *xchan, int pending __unused)
1464 struct vmbus_channel *chan = xchan;
1465 struct vmbus_channel *pri_chan = chan->ch_prichan;
1467 KASSERT(!VMBUS_CHAN_ISPRIMARY(chan),
1468 ("chan%u is primary channel", chan->ch_id));
1470 /* Release this channel (back to vmbus). */
1471 vmbus_chan_release(chan);
1473 /* Unlink from its primary channel's sub-channel list. */
1474 mtx_lock(&pri_chan->ch_subchan_lock);
1475 vmbus_chan_rem_sublist(pri_chan, chan);
1476 mtx_unlock(&pri_chan->ch_subchan_lock);
1477 /* Notify anyone that is waiting for this sub-channel to vanish. */
1480 /* Free this channel's resource. */
1481 vmbus_chan_free(chan);
1485 vmbus_prichan_attach_task(void *xchan, int pending __unused)
1489 * Add device for this primary channel.
1491 vmbus_add_child(xchan);
1495 vmbus_subchan_attach_task(void *xchan __unused, int pending __unused)
1502 vmbus_chan_destroy_all(struct vmbus_softc *sc)
1506 * Detach all devices and destroy the corresponding primary
1510 struct vmbus_channel *chan;
1512 mtx_lock(&sc->vmbus_chan_lock);
1513 TAILQ_FOREACH(chan, &sc->vmbus_chans, ch_link) {
1514 if (VMBUS_CHAN_ISPRIMARY(chan))
1518 /* No more primary channels; done. */
1519 mtx_unlock(&sc->vmbus_chan_lock);
1522 vmbus_chan_rem_list(sc, chan);
1523 mtx_unlock(&sc->vmbus_chan_lock);
1525 mtx_lock(&sc->vmbus_prichan_lock);
1526 vmbus_chan_rem_prilist(sc, chan);
1527 mtx_unlock(&sc->vmbus_prichan_lock);
1529 taskqueue_enqueue(chan->ch_mgmt_tq, &chan->ch_detach_task);
1534 * The channel whose vcpu binding is closest to the currect vcpu will
1536 * If no multi-channel, always select primary channel.
1538 struct vmbus_channel *
1539 vmbus_chan_cpu2chan(struct vmbus_channel *prichan, int cpu)
1541 struct vmbus_channel *sel, *chan;
1542 uint32_t vcpu, sel_dist;
1544 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpuid %d", cpu));
1545 if (TAILQ_EMPTY(&prichan->ch_subchans))
1548 vcpu = VMBUS_PCPU_GET(prichan->ch_vmbus, vcpuid, cpu);
1550 #define CHAN_VCPU_DIST(ch, vcpu) \
1551 (((ch)->ch_vcpuid > (vcpu)) ? \
1552 ((ch)->ch_vcpuid - (vcpu)) : ((vcpu) - (ch)->ch_vcpuid))
1554 #define CHAN_SELECT(ch) \
1557 sel_dist = CHAN_VCPU_DIST(ch, vcpu); \
1560 CHAN_SELECT(prichan);
1562 mtx_lock(&prichan->ch_subchan_lock);
1563 TAILQ_FOREACH(chan, &prichan->ch_subchans, ch_sublink) {
1566 KASSERT(chan->ch_stflags & VMBUS_CHAN_ST_OPENED,
1567 ("chan%u is not opened", chan->ch_id));
1569 if (chan->ch_vcpuid == vcpu) {
1570 /* Exact match; done */
1575 dist = CHAN_VCPU_DIST(chan, vcpu);
1576 if (sel_dist <= dist) {
1577 /* Far or same distance; skip */
1581 /* Select the closer channel. */
1584 mtx_unlock(&prichan->ch_subchan_lock);
1587 #undef CHAN_VCPU_DIST
1592 struct vmbus_channel **
1593 vmbus_subchan_get(struct vmbus_channel *pri_chan, int subchan_cnt)
1595 struct vmbus_channel **ret, *chan;
1598 KASSERT(subchan_cnt > 0, ("invalid sub-channel count %d", subchan_cnt));
1600 ret = malloc(subchan_cnt * sizeof(struct vmbus_channel *), M_TEMP,
1603 mtx_lock(&pri_chan->ch_subchan_lock);
1605 while (pri_chan->ch_subchan_cnt < subchan_cnt)
1606 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "subch", 0);
1609 TAILQ_FOREACH(chan, &pri_chan->ch_subchans, ch_sublink) {
1610 /* TODO: refcnt chan */
1614 if (i == subchan_cnt)
1617 KASSERT(i == subchan_cnt, ("invalid subchan count %d, should be %d",
1618 pri_chan->ch_subchan_cnt, subchan_cnt));
1620 mtx_unlock(&pri_chan->ch_subchan_lock);
1626 vmbus_subchan_rel(struct vmbus_channel **subchan, int subchan_cnt __unused)
1629 free(subchan, M_TEMP);
1633 vmbus_subchan_drain(struct vmbus_channel *pri_chan)
1635 mtx_lock(&pri_chan->ch_subchan_lock);
1636 while (pri_chan->ch_subchan_cnt > 0)
1637 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "dsubch", 0);
1638 mtx_unlock(&pri_chan->ch_subchan_lock);
1642 vmbus_chan_msgproc(struct vmbus_softc *sc, const struct vmbus_message *msg)
1644 vmbus_chanmsg_proc_t msg_proc;
1647 msg_type = ((const struct vmbus_chanmsg_hdr *)msg->msg_data)->chm_type;
1648 KASSERT(msg_type < VMBUS_CHANMSG_TYPE_MAX,
1649 ("invalid message type %u", msg_type));
1651 msg_proc = vmbus_chan_msgprocs[msg_type];
1652 if (msg_proc != NULL)
1657 vmbus_chan_set_readbatch(struct vmbus_channel *chan, bool on)
1660 chan->ch_flags &= ~VMBUS_CHAN_FLAG_BATCHREAD;
1662 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD;
1666 vmbus_chan_id(const struct vmbus_channel *chan)
1672 vmbus_chan_subidx(const struct vmbus_channel *chan)
1674 return chan->ch_subidx;
1678 vmbus_chan_is_primary(const struct vmbus_channel *chan)
1680 if (VMBUS_CHAN_ISPRIMARY(chan))
1686 const struct hyperv_guid *
1687 vmbus_chan_guid_inst(const struct vmbus_channel *chan)
1689 return &chan->ch_guid_inst;
1693 vmbus_chan_prplist_nelem(int br_size, int prpcnt_max, int dlen_max)
1697 elem_size = __offsetof(struct vmbus_chanpkt_prplist,
1698 cp_range[0].gpa_page[prpcnt_max]);
1699 elem_size += dlen_max;
1700 elem_size = VMBUS_CHANPKT_TOTLEN(elem_size);
1702 return (vmbus_br_nelem(br_size, elem_size));
1706 vmbus_chan_tx_empty(const struct vmbus_channel *chan)
1709 return (vmbus_txbr_empty(&chan->ch_txbr));
1713 vmbus_chan_rx_empty(const struct vmbus_channel *chan)
1716 return (vmbus_rxbr_empty(&chan->ch_rxbr));
1720 vmbus_chan_printf(const struct vmbus_channel *chan, const char *fmt, ...)
1726 if (chan->ch_dev == NULL || !device_is_alive(chan->ch_dev))
1727 dev = chan->ch_vmbus->vmbus_dev;
1731 retval = device_print_prettyname(dev);
1733 retval += vprintf(fmt, ap);
1740 vmbus_chan_run_task(struct vmbus_channel *chan, struct task *task)
1743 taskqueue_enqueue(chan->ch_tq, task);
1744 taskqueue_drain(chan->ch_tq, task);
1748 vmbus_chan_mgmt_tq(const struct vmbus_channel *chan)
1751 return (chan->ch_mgmt_tq);