vmbus_chan.c revision 308517
1/*- 2 * Copyright (c) 2009-2012,2016 Microsoft Corp. 3 * Copyright (c) 2012 NetApp Inc. 4 * Copyright (c) 2012 Citrix Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 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. 16 * 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. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/11/sys/dev/hyperv/vmbus/vmbus_chan.c 308517 2016-11-11 08:43:34Z sephe $"); 31 32#include <sys/param.h> 33#include <sys/kernel.h> 34#include <sys/lock.h> 35#include <sys/malloc.h> 36#include <sys/mutex.h> 37#include <sys/smp.h> 38#include <sys/sysctl.h> 39#include <sys/systm.h> 40 41#include <machine/atomic.h> 42 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> 49 50static void vmbus_chan_update_evtflagcnt( 51 struct vmbus_softc *, 52 const struct vmbus_channel *); 53static void vmbus_chan_close_internal( 54 struct vmbus_channel *); 55static int vmbus_chan_sysctl_mnf(SYSCTL_HANDLER_ARGS); 56static void vmbus_chan_sysctl_create( 57 struct vmbus_channel *); 58static struct vmbus_channel *vmbus_chan_alloc(struct vmbus_softc *); 59static void vmbus_chan_free(struct vmbus_channel *); 60static int vmbus_chan_add(struct vmbus_channel *); 61static void vmbus_chan_cpu_default(struct vmbus_channel *); 62static int vmbus_chan_release(struct vmbus_channel *); 63static void vmbus_chan_set_chmap(struct vmbus_channel *); 64static void vmbus_chan_clear_chmap(struct vmbus_channel *); 65 66static void vmbus_chan_ins_prilist(struct vmbus_softc *, 67 struct vmbus_channel *); 68static void vmbus_chan_rem_prilist(struct vmbus_softc *, 69 struct vmbus_channel *); 70static void vmbus_chan_ins_list(struct vmbus_softc *, 71 struct vmbus_channel *); 72static void vmbus_chan_rem_list(struct vmbus_softc *, 73 struct vmbus_channel *); 74static void vmbus_chan_ins_sublist(struct vmbus_channel *, 75 struct vmbus_channel *); 76static void vmbus_chan_rem_sublist(struct vmbus_channel *, 77 struct vmbus_channel *); 78 79static void vmbus_chan_task(void *, int); 80static void vmbus_chan_task_nobatch(void *, int); 81static void vmbus_chan_clrchmap_task(void *, int); 82static void vmbus_prichan_attach_task(void *, int); 83static void vmbus_subchan_attach_task(void *, int); 84static void vmbus_prichan_detach_task(void *, int); 85static void vmbus_subchan_detach_task(void *, int); 86 87static void vmbus_chan_msgproc_choffer(struct vmbus_softc *, 88 const struct vmbus_message *); 89static void vmbus_chan_msgproc_chrescind( 90 struct vmbus_softc *, 91 const struct vmbus_message *); 92 93/* 94 * Vmbus channel message processing. 95 */ 96static const vmbus_chanmsg_proc_t 97vmbus_chan_msgprocs[VMBUS_CHANMSG_TYPE_MAX] = { 98 VMBUS_CHANMSG_PROC(CHOFFER, vmbus_chan_msgproc_choffer), 99 VMBUS_CHANMSG_PROC(CHRESCIND, vmbus_chan_msgproc_chrescind), 100 101 VMBUS_CHANMSG_PROC_WAKEUP(CHOPEN_RESP), 102 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_CONNRESP), 103 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_DISCONNRESP) 104}; 105 106/* 107 * Notify host that there are data pending on our TX bufring. 108 */ 109static __inline void 110vmbus_chan_signal_tx(const struct vmbus_channel *chan) 111{ 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); 115 else 116 hypercall_signal_event(chan->ch_monprm_dma.hv_paddr); 117} 118 119static void 120vmbus_chan_ins_prilist(struct vmbus_softc *sc, struct vmbus_channel *chan) 121{ 122 123 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); 128} 129 130static void 131vmbus_chan_rem_prilist(struct vmbus_softc *sc, struct vmbus_channel *chan) 132{ 133 134 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); 139} 140 141static void 142vmbus_chan_ins_sublist(struct vmbus_channel *prichan, 143 struct vmbus_channel *chan) 144{ 145 146 mtx_assert(&prichan->ch_subchan_lock, MA_OWNED); 147 148 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); 152 153 /* Bump sub-channel count. */ 154 prichan->ch_subchan_cnt++; 155} 156 157static void 158vmbus_chan_rem_sublist(struct vmbus_channel *prichan, 159 struct vmbus_channel *chan) 160{ 161 162 mtx_assert(&prichan->ch_subchan_lock, MA_OWNED); 163 164 KASSERT(prichan->ch_subchan_cnt > 0, 165 ("invalid subchan_cnt %d", prichan->ch_subchan_cnt)); 166 prichan->ch_subchan_cnt--; 167 168 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); 172} 173 174static void 175vmbus_chan_ins_list(struct vmbus_softc *sc, struct vmbus_channel *chan) 176{ 177 178 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); 183} 184 185static void 186vmbus_chan_rem_list(struct vmbus_softc *sc, struct vmbus_channel *chan) 187{ 188 189 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); 194} 195 196static int 197vmbus_chan_sysctl_mnf(SYSCTL_HANDLER_ARGS) 198{ 199 struct vmbus_channel *chan = arg1; 200 int mnf = 0; 201 202 if (chan->ch_txflags & VMBUS_CHAN_TXF_HASMNF) 203 mnf = 1; 204 return sysctl_handle_int(oidp, &mnf, 0, req); 205} 206 207static void 208vmbus_chan_sysctl_create(struct vmbus_channel *chan) 209{ 210 struct sysctl_oid *ch_tree, *chid_tree, *br_tree; 211 struct sysctl_ctx_list *ctx; 212 uint32_t ch_id; 213 char name[16]; 214 215 /* 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. 220 */ 221 ctx = &chan->ch_sysctl_ctx; 222 sysctl_ctx_init(ctx); 223 224 /* 225 * Create dev.NAME.UNIT.channel tree. 226 */ 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, ""); 230 if (ch_tree == NULL) 231 return; 232 233 /* 234 * Create dev.NAME.UNIT.channel.CHANID tree. 235 */ 236 if (VMBUS_CHAN_ISPRIMARY(chan)) 237 ch_id = chan->ch_id; 238 else 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) 244 return; 245 246 if (!VMBUS_CHAN_ISPRIMARY(chan)) { 247 /* 248 * Create dev.NAME.UNIT.channel.CHANID.sub tree. 249 */ 250 ch_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), 251 OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 252 if (ch_tree == NULL) 253 return; 254 255 /* 256 * Create dev.NAME.UNIT.channel.CHANID.sub.SUBIDX tree. 257 * 258 * NOTE: 259 * chid_tree is changed to this new sysctl tree. 260 */ 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) 265 return; 266 267 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 268 "chanid", CTLFLAG_RD, &chan->ch_id, 0, "channel id"); 269 } 270 271 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"); 277 278 br_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 279 "br", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 280 if (br_tree != NULL) { 281 /* 282 * Create sysctl tree for RX bufring. 283 */ 284 vmbus_br_sysctl_create(ctx, br_tree, &chan->ch_rxbr.rxbr, "rx"); 285 /* 286 * Create sysctl tree for TX bufring. 287 */ 288 vmbus_br_sysctl_create(ctx, br_tree, &chan->ch_txbr.txbr, "tx"); 289 } 290} 291 292int 293vmbus_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) 295{ 296 struct vmbus_chan_br cbr; 297 int error; 298 299 /* 300 * Allocate the TX+RX bufrings. 301 */ 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, 305 BUS_DMA_WAITOK); 306 if (chan->ch_bufring == NULL) { 307 device_printf(chan->ch_dev, "bufring allocation failed\n"); 308 return (ENOMEM); 309 } 310 311 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; 315 316 error = vmbus_chan_open_br(chan, &cbr, udata, udlen, cb, cbarg); 317 if (error) { 318 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring); 319 chan->ch_bufring = NULL; 320 } 321 return (error); 322} 323 324int 325vmbus_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) 327{ 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; 333 uint32_t status; 334 int error, txbr_size, rxbr_size; 335 task_fn_t *task_fn; 336 uint8_t *br; 337 338 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); 341 return EINVAL; 342 } 343 344 br = cbr->cbr; 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")); 353 354 /* 355 * Zero out the TX/RX bufrings, in case that they were used before. 356 */ 357 memset(br, 0, txbr_size + rxbr_size); 358 359 if (atomic_testandset_int(&chan->ch_stflags, 360 VMBUS_CHAN_ST_OPENED_SHIFT)) 361 panic("double-open chan%u", chan->ch_id); 362 363 chan->ch_cb = cb; 364 chan->ch_cbarg = cbarg; 365 366 vmbus_chan_update_evtflagcnt(sc, chan); 367 368 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; 371 else 372 task_fn = vmbus_chan_task_nobatch; 373 TASK_INIT(&chan->ch_task, 0, task_fn, chan); 374 375 /* 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); 379 380 /* Create sysctl tree for this channel */ 381 vmbus_chan_sysctl_create(chan); 382 383 /* 384 * Connect the bufrings, both RX and TX, to this channel. 385 */ 386 error = vmbus_chan_gpadl_connect(chan, cbr->cbr_paddr, 387 txbr_size + rxbr_size, &chan->ch_bufring_gpadl); 388 if (error) { 389 device_printf(sc->vmbus_dev, 390 "failed to connect bufring GPADL to chan%u\n", chan->ch_id); 391 goto failed; 392 } 393 394 /* 395 * Install this channel, before it is opened, but after everything 396 * else has been setup. 397 */ 398 vmbus_chan_set_chmap(chan); 399 400 /* 401 * Open channel w/ the bufring GPADL on the target CPU. 402 */ 403 mh = vmbus_msghc_get(sc, sizeof(*req)); 404 if (mh == NULL) { 405 device_printf(sc->vmbus_dev, 406 "can not get msg hypercall for chopen(chan%u)\n", 407 chan->ch_id); 408 error = ENXIO; 409 goto failed; 410 } 411 412 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; 419 if (udlen > 0) 420 memcpy(req->chm_udata, udata, udlen); 421 422 error = vmbus_msghc_exec(sc, mh); 423 if (error) { 424 device_printf(sc->vmbus_dev, 425 "chopen(chan%u) msg hypercall exec failed: %d\n", 426 chan->ch_id, error); 427 vmbus_msghc_put(sc, mh); 428 goto failed; 429 } 430 431 msg = vmbus_msghc_wait_result(sc, mh); 432 resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data; 433 status = resp->chm_status; 434 435 vmbus_msghc_put(sc, mh); 436 437 if (status == 0) { 438 if (bootverbose) { 439 device_printf(sc->vmbus_dev, "chan%u opened\n", 440 chan->ch_id); 441 } 442 return 0; 443 } 444 445 device_printf(sc->vmbus_dev, "failed to open chan%u\n", chan->ch_id); 446 error = ENXIO; 447 448failed: 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; 453 } 454 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED); 455 return error; 456} 457 458int 459vmbus_chan_gpadl_connect(struct vmbus_channel *chan, bus_addr_t paddr, 460 int size, uint32_t *gpadl0) 461{ 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; 466 size_t reqsz; 467 uint32_t gpadl, status; 468 int page_count, range_len, i, cnt, error; 469 uint64_t page_id; 470 471 /* 472 * Preliminary checks. 473 */ 474 475 KASSERT((size & PAGE_MASK) == 0, 476 ("invalid GPA size %d, not multiple page size", size)); 477 page_count = size >> PAGE_SHIFT; 478 479 KASSERT((paddr & PAGE_MASK) == 0, 480 ("GPA is not page aligned %jx", (uintmax_t)paddr)); 481 page_id = paddr >> PAGE_SHIFT; 482 483 range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); 484 /* 485 * We don't support multiple GPA ranges. 486 */ 487 if (range_len > UINT16_MAX) { 488 device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", 489 page_count); 490 return EOPNOTSUPP; 491 } 492 493 /* 494 * Allocate GPADL id. 495 */ 496 gpadl = vmbus_gpadl_alloc(sc); 497 *gpadl0 = gpadl; 498 499 /* 500 * Connect this GPADL to the target channel. 501 * 502 * NOTE: 503 * Since each message can only hold small set of page 504 * addresses, several messages may be required to 505 * complete the connection. 506 */ 507 if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) 508 cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; 509 else 510 cnt = page_count; 511 page_count -= cnt; 512 513 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, 514 chm_range.gpa_page[cnt]); 515 mh = vmbus_msghc_get(sc, reqsz); 516 if (mh == NULL) { 517 device_printf(sc->vmbus_dev, 518 "can not get msg hypercall for gpadl->chan%u\n", 519 chan->ch_id); 520 return EIO; 521 } 522 523 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++; 533 534 error = vmbus_msghc_exec(sc, mh); 535 if (error) { 536 device_printf(sc->vmbus_dev, 537 "gpadl->chan%u msg hypercall exec failed: %d\n", 538 chan->ch_id, error); 539 vmbus_msghc_put(sc, mh); 540 return error; 541 } 542 543 while (page_count > 0) { 544 struct vmbus_chanmsg_gpadl_subconn *subreq; 545 546 if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) 547 cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; 548 else 549 cnt = page_count; 550 page_count -= cnt; 551 552 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, 553 chm_gpa_page[cnt]); 554 vmbus_msghc_reset(mh, reqsz); 555 556 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++; 561 562 vmbus_msghc_exec_noresult(mh); 563 } 564 KASSERT(page_count == 0, ("invalid page count %d", page_count)); 565 566 msg = vmbus_msghc_wait_result(sc, mh); 567 status = ((const struct vmbus_chanmsg_gpadl_connresp *) 568 msg->msg_data)->chm_status; 569 570 vmbus_msghc_put(sc, mh); 571 572 if (status != 0) { 573 device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " 574 "status %u\n", chan->ch_id, status); 575 return EIO; 576 } else { 577 if (bootverbose) { 578 device_printf(sc->vmbus_dev, "gpadl->chan%u " 579 "succeeded\n", chan->ch_id); 580 } 581 } 582 return 0; 583} 584 585/* 586 * Disconnect the GPA from the target channel 587 */ 588int 589vmbus_chan_gpadl_disconnect(struct vmbus_channel *chan, uint32_t gpadl) 590{ 591 struct vmbus_softc *sc = chan->ch_vmbus; 592 struct vmbus_msghc *mh; 593 struct vmbus_chanmsg_gpadl_disconn *req; 594 int error; 595 596 mh = vmbus_msghc_get(sc, sizeof(*req)); 597 if (mh == NULL) { 598 device_printf(sc->vmbus_dev, 599 "can not get msg hypercall for gpa x->chan%u\n", 600 chan->ch_id); 601 return EBUSY; 602 } 603 604 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; 608 609 error = vmbus_msghc_exec(sc, mh); 610 if (error) { 611 device_printf(sc->vmbus_dev, 612 "gpa x->chan%u msg hypercall exec failed: %d\n", 613 chan->ch_id, error); 614 vmbus_msghc_put(sc, mh); 615 return error; 616 } 617 618 vmbus_msghc_wait_result(sc, mh); 619 /* Discard result; no useful information */ 620 vmbus_msghc_put(sc, mh); 621 622 return 0; 623} 624 625static void 626vmbus_chan_clrchmap_task(void *xchan, int pending __unused) 627{ 628 struct vmbus_channel *chan = xchan; 629 630 critical_enter(); 631 chan->ch_vmbus->vmbus_chmap[chan->ch_id] = NULL; 632 critical_exit(); 633} 634 635static void 636vmbus_chan_clear_chmap(struct vmbus_channel *chan) 637{ 638 struct task chmap_task; 639 640 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); 643} 644 645static void 646vmbus_chan_set_chmap(struct vmbus_channel *chan) 647{ 648 __compiler_membar(); 649 chan->ch_vmbus->vmbus_chmap[chan->ch_id] = chan; 650} 651 652static void 653vmbus_chan_close_internal(struct vmbus_channel *chan) 654{ 655 struct vmbus_softc *sc = chan->ch_vmbus; 656 struct vmbus_msghc *mh; 657 struct vmbus_chanmsg_chclose *req; 658 int error; 659 660 /* TODO: stringent check */ 661 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED); 662 663 /* 664 * Free this channel's sysctl tree attached to its device's 665 * sysctl tree. 666 */ 667 sysctl_ctx_free(&chan->ch_sysctl_ctx); 668 669 /* 670 * NOTE: 671 * Order is critical. This channel _must_ be uninstalled first, 672 * else the channel task may be enqueued by the IDT after it has 673 * been drained. 674 */ 675 vmbus_chan_clear_chmap(chan); 676 taskqueue_drain(chan->ch_tq, &chan->ch_task); 677 chan->ch_tq = NULL; 678 679 /* 680 * Close this channel. 681 */ 682 mh = vmbus_msghc_get(sc, sizeof(*req)); 683 if (mh == NULL) { 684 device_printf(sc->vmbus_dev, 685 "can not get msg hypercall for chclose(chan%u)\n", 686 chan->ch_id); 687 return; 688 } 689 690 req = vmbus_msghc_dataptr(mh); 691 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; 692 req->chm_chanid = chan->ch_id; 693 694 error = vmbus_msghc_exec_noresult(mh); 695 vmbus_msghc_put(sc, mh); 696 697 if (error) { 698 device_printf(sc->vmbus_dev, 699 "chclose(chan%u) msg hypercall exec failed: %d\n", 700 chan->ch_id, error); 701 return; 702 } else if (bootverbose) { 703 device_printf(sc->vmbus_dev, "close chan%u\n", chan->ch_id); 704 } 705 706 /* 707 * Disconnect the TX+RX bufrings from this channel. 708 */ 709 if (chan->ch_bufring_gpadl) { 710 vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl); 711 chan->ch_bufring_gpadl = 0; 712 } 713 714 /* 715 * Destroy the TX+RX bufrings. 716 */ 717 if (chan->ch_bufring != NULL) { 718 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring); 719 chan->ch_bufring = NULL; 720 } 721} 722 723/* 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. 727 */ 728void 729vmbus_chan_close(struct vmbus_channel *chan) 730{ 731 int subchan_cnt; 732 733 if (!VMBUS_CHAN_ISPRIMARY(chan)) { 734 /* 735 * Sub-channel is closed when its primary channel 736 * is closed; done. 737 */ 738 return; 739 } 740 741 /* 742 * Close all sub-channels, if any. 743 */ 744 subchan_cnt = chan->ch_subchan_cnt; 745 if (subchan_cnt > 0) { 746 struct vmbus_channel **subchan; 747 int i; 748 749 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); 753 } 754 755 /* Then close the primary channel. */ 756 vmbus_chan_close_internal(chan); 757} 758 759void 760vmbus_chan_intr_drain(struct vmbus_channel *chan) 761{ 762 763 taskqueue_drain(chan->ch_tq, &chan->ch_task); 764} 765 766int 767vmbus_chan_send(struct vmbus_channel *chan, uint16_t type, uint16_t flags, 768 void *data, int dlen, uint64_t xactid) 769{ 770 struct vmbus_chanpkt pkt; 771 int pktlen, pad_pktlen, hlen, error; 772 uint64_t pad = 0; 773 struct iovec iov[3]; 774 boolean_t send_evt; 775 776 hlen = sizeof(pkt); 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)); 781 782 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; 787 788 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; 794 795 error = vmbus_txbr_write(&chan->ch_txbr, iov, 3, &send_evt); 796 if (!error && send_evt) 797 vmbus_chan_signal_tx(chan); 798 return error; 799} 800 801int 802vmbus_chan_send_sglist(struct vmbus_channel *chan, 803 struct vmbus_gpa sg[], int sglen, void *data, int dlen, uint64_t xactid) 804{ 805 struct vmbus_chanpkt_sglist pkt; 806 int pktlen, pad_pktlen, hlen, error; 807 struct iovec iov[4]; 808 boolean_t send_evt; 809 uint64_t pad = 0; 810 811 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)); 816 817 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; 822 pkt.cp_rsvd = 0; 823 pkt.cp_gpa_cnt = sglen; 824 825 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; 833 834 error = vmbus_txbr_write(&chan->ch_txbr, iov, 4, &send_evt); 835 if (!error && send_evt) 836 vmbus_chan_signal_tx(chan); 837 return error; 838} 839 840int 841vmbus_chan_send_prplist(struct vmbus_channel *chan, 842 struct vmbus_gpa_range *prp, int prp_cnt, void *data, int dlen, 843 uint64_t xactid) 844{ 845 struct vmbus_chanpkt_prplist pkt; 846 int pktlen, pad_pktlen, hlen, error; 847 struct iovec iov[4]; 848 boolean_t send_evt; 849 uint64_t pad = 0; 850 851 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)); 857 858 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; 863 pkt.cp_rsvd = 0; 864 pkt.cp_range_cnt = 1; 865 866 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; 874 875 error = vmbus_txbr_write(&chan->ch_txbr, iov, 4, &send_evt); 876 if (!error && send_evt) 877 vmbus_chan_signal_tx(chan); 878 return error; 879} 880 881int 882vmbus_chan_recv(struct vmbus_channel *chan, void *data, int *dlen0, 883 uint64_t *xactid) 884{ 885 struct vmbus_chanpkt_hdr pkt; 886 int error, dlen, hlen; 887 888 error = vmbus_rxbr_peek(&chan->ch_rxbr, &pkt, sizeof(pkt)); 889 if (error) 890 return (error); 891 892 if (__predict_false(pkt.cph_hlen < VMBUS_CHANPKT_HLEN_MIN)) { 893 device_printf(chan->ch_dev, "invalid hlen %u\n", 894 pkt.cph_hlen); 895 /* XXX this channel is dead actually. */ 896 return (EIO); 897 } 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. */ 902 return (EIO); 903 } 904 905 hlen = VMBUS_CHANPKT_GETLEN(pkt.cph_hlen); 906 dlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen) - hlen; 907 908 if (*dlen0 < dlen) { 909 /* Return the size of this packet's data. */ 910 *dlen0 = dlen; 911 return (ENOBUFS); 912 } 913 914 *xactid = pkt.cph_xactid; 915 *dlen0 = dlen; 916 917 /* Skip packet header */ 918 error = vmbus_rxbr_read(&chan->ch_rxbr, data, dlen, hlen); 919 KASSERT(!error, ("vmbus_rxbr_read failed")); 920 921 return (0); 922} 923 924int 925vmbus_chan_recv_pkt(struct vmbus_channel *chan, 926 struct vmbus_chanpkt_hdr *pkt0, int *pktlen0) 927{ 928 struct vmbus_chanpkt_hdr pkt; 929 int error, pktlen; 930 931 error = vmbus_rxbr_peek(&chan->ch_rxbr, &pkt, sizeof(pkt)); 932 if (error) 933 return (error); 934 935 if (__predict_false(pkt.cph_hlen < VMBUS_CHANPKT_HLEN_MIN)) { 936 device_printf(chan->ch_dev, "invalid hlen %u\n", 937 pkt.cph_hlen); 938 /* XXX this channel is dead actually. */ 939 return (EIO); 940 } 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. */ 945 return (EIO); 946 } 947 948 pktlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen); 949 if (*pktlen0 < pktlen) { 950 /* Return the size of this packet. */ 951 *pktlen0 = pktlen; 952 return (ENOBUFS); 953 } 954 *pktlen0 = pktlen; 955 956 /* Include packet header */ 957 error = vmbus_rxbr_read(&chan->ch_rxbr, pkt0, pktlen, 0); 958 KASSERT(!error, ("vmbus_rxbr_read failed")); 959 960 return (0); 961} 962 963static void 964vmbus_chan_task(void *xchan, int pending __unused) 965{ 966 struct vmbus_channel *chan = xchan; 967 vmbus_chan_callback_t cb = chan->ch_cb; 968 void *cbarg = chan->ch_cbarg; 969 970 /* 971 * Optimize host to guest signaling by ensuring: 972 * 1. While reading the channel, we disable interrupts from 973 * host. 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. 979 * 980 * NOTE: Interrupt has been disabled in the ISR. 981 */ 982 for (;;) { 983 uint32_t left; 984 985 cb(chan, cbarg); 986 987 left = vmbus_rxbr_intr_unmask(&chan->ch_rxbr); 988 if (left == 0) { 989 /* No more data in RX bufring; done */ 990 break; 991 } 992 vmbus_rxbr_intr_mask(&chan->ch_rxbr); 993 } 994} 995 996static void 997vmbus_chan_task_nobatch(void *xchan, int pending __unused) 998{ 999 struct vmbus_channel *chan = xchan; 1000 1001 chan->ch_cb(chan, chan->ch_cbarg); 1002} 1003 1004static __inline void 1005vmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags, 1006 int flag_cnt) 1007{ 1008 int f; 1009 1010 for (f = 0; f < flag_cnt; ++f) { 1011 uint32_t chid_base; 1012 u_long flags; 1013 int chid_ofs; 1014 1015 if (event_flags[f] == 0) 1016 continue; 1017 1018 flags = atomic_swap_long(&event_flags[f], 0); 1019 chid_base = f << VMBUS_EVTFLAG_SHIFT; 1020 1021 while ((chid_ofs = ffsl(flags)) != 0) { 1022 struct vmbus_channel *chan; 1023 1024 --chid_ofs; /* NOTE: ffsl is 1-based */ 1025 flags &= ~(1UL << chid_ofs); 1026 1027 chan = sc->vmbus_chmap[chid_base + chid_ofs]; 1028 if (__predict_false(chan == NULL)) { 1029 /* Channel is closed. */ 1030 continue; 1031 } 1032 __compiler_membar(); 1033 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); 1037 } 1038 } 1039} 1040 1041void 1042vmbus_event_proc(struct vmbus_softc *sc, int cpu) 1043{ 1044 struct vmbus_evtflags *eventf; 1045 1046 /* 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. 1049 */ 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)); 1053} 1054 1055void 1056vmbus_event_proc_compat(struct vmbus_softc *sc, int cpu) 1057{ 1058 struct vmbus_evtflags *eventf; 1059 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); 1064 } 1065} 1066 1067static void 1068vmbus_chan_update_evtflagcnt(struct vmbus_softc *sc, 1069 const struct vmbus_channel *chan) 1070{ 1071 volatile int *flag_cnt_ptr; 1072 int flag_cnt; 1073 1074 flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1; 1075 flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->ch_cpuid); 1076 1077 for (;;) { 1078 int old_flag_cnt; 1079 1080 old_flag_cnt = *flag_cnt_ptr; 1081 if (old_flag_cnt >= flag_cnt) 1082 break; 1083 if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) { 1084 if (bootverbose) { 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); 1088 } 1089 break; 1090 } 1091 } 1092} 1093 1094static struct vmbus_channel * 1095vmbus_chan_alloc(struct vmbus_softc *sc) 1096{ 1097 struct vmbus_channel *chan; 1098 1099 chan = malloc(sizeof(*chan), M_DEVBUF, M_WAITOK | M_ZERO); 1100 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); 1107 return NULL; 1108 } 1109 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); 1115 1116 return chan; 1117} 1118 1119static void 1120vmbus_chan_free(struct vmbus_channel *chan) 1121{ 1122 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); 1135} 1136 1137static int 1138vmbus_chan_add(struct vmbus_channel *newchan) 1139{ 1140 struct vmbus_softc *sc = newchan->ch_vmbus; 1141 struct vmbus_channel *prichan; 1142 1143 if (newchan->ch_id == 0) { 1144 /* 1145 * XXX 1146 * Chan0 will neither be processed nor should be offered; 1147 * skip it. 1148 */ 1149 device_printf(sc->vmbus_dev, "got chan0 offer, discard\n"); 1150 return EINVAL; 1151 } else if (newchan->ch_id >= VMBUS_CHAN_MAX) { 1152 device_printf(sc->vmbus_dev, "invalid chan%u offer\n", 1153 newchan->ch_id); 1154 return EINVAL; 1155 } 1156 1157 if (bootverbose) { 1158 device_printf(sc->vmbus_dev, "chan%u subidx%u offer\n", 1159 newchan->ch_id, newchan->ch_subidx); 1160 } 1161 1162 mtx_lock(&sc->vmbus_prichan_lock); 1163 TAILQ_FOREACH(prichan, &sc->vmbus_prichans, ch_prilink) { 1164 /* 1165 * Sub-channel will have the same type GUID and instance 1166 * GUID as its primary channel. 1167 */ 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) 1172 break; 1173 } 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); 1179 goto done; 1180 } else { 1181 mtx_unlock(&sc->vmbus_prichan_lock); 1182 device_printf(sc->vmbus_dev, "duplicated primary " 1183 "chan%u\n", newchan->ch_id); 1184 return EINVAL; 1185 } 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); 1191 return EINVAL; 1192 } 1193 /* 1194 * Found the primary channel for this sub-channel and 1195 * move on. 1196 * 1197 * XXX refcnt prichan 1198 */ 1199 } 1200 mtx_unlock(&sc->vmbus_prichan_lock); 1201 1202 /* 1203 * This is a sub-channel; link it with the primary channel. 1204 */ 1205 KASSERT(!VMBUS_CHAN_ISPRIMARY(newchan), 1206 ("new channel is not sub-channel")); 1207 KASSERT(prichan != NULL, ("no primary channel")); 1208 1209 newchan->ch_prichan = prichan; 1210 newchan->ch_dev = prichan->ch_dev; 1211 1212 mtx_lock(&prichan->ch_subchan_lock); 1213 vmbus_chan_ins_sublist(prichan, newchan); 1214 mtx_unlock(&prichan->ch_subchan_lock); 1215 /* 1216 * Notify anyone that is interested in this sub-channel, 1217 * after this sub-channel is setup. 1218 */ 1219 wakeup(prichan); 1220done: 1221 /* 1222 * Hook this channel up for later rescind. 1223 */ 1224 mtx_lock(&sc->vmbus_chan_lock); 1225 vmbus_chan_ins_list(sc, newchan); 1226 mtx_unlock(&sc->vmbus_chan_lock); 1227 return 0; 1228} 1229 1230void 1231vmbus_chan_cpu_set(struct vmbus_channel *chan, int cpu) 1232{ 1233 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpu %d", cpu)); 1234 1235 if (chan->ch_vmbus->vmbus_version == VMBUS_VERSION_WS2008 || 1236 chan->ch_vmbus->vmbus_version == VMBUS_VERSION_WIN7) { 1237 /* Only cpu0 is supported */ 1238 cpu = 0; 1239 } 1240 1241 chan->ch_cpuid = cpu; 1242 chan->ch_vcpuid = VMBUS_PCPU_GET(chan->ch_vmbus, vcpuid, cpu); 1243 1244 if (bootverbose) { 1245 printf("vmbus_chan%u: assigned to cpu%u [vcpu%u]\n", 1246 chan->ch_id, chan->ch_cpuid, chan->ch_vcpuid); 1247 } 1248} 1249 1250void 1251vmbus_chan_cpu_rr(struct vmbus_channel *chan) 1252{ 1253 static uint32_t vmbus_chan_nextcpu; 1254 int cpu; 1255 1256 cpu = atomic_fetchadd_int(&vmbus_chan_nextcpu, 1) % mp_ncpus; 1257 vmbus_chan_cpu_set(chan, cpu); 1258} 1259 1260static void 1261vmbus_chan_cpu_default(struct vmbus_channel *chan) 1262{ 1263 /* 1264 * By default, pin the channel to cpu0. Devices having 1265 * special channel-cpu mapping requirement should call 1266 * vmbus_chan_cpu_{set,rr}(). 1267 */ 1268 vmbus_chan_cpu_set(chan, 0); 1269} 1270 1271static void 1272vmbus_chan_msgproc_choffer(struct vmbus_softc *sc, 1273 const struct vmbus_message *msg) 1274{ 1275 const struct vmbus_chanmsg_choffer *offer; 1276 struct vmbus_channel *chan; 1277 task_fn_t *detach_fn, *attach_fn; 1278 int error; 1279 1280 offer = (const struct vmbus_chanmsg_choffer *)msg->msg_data; 1281 1282 chan = vmbus_chan_alloc(sc); 1283 if (chan == NULL) { 1284 device_printf(sc->vmbus_dev, "allocate chan%u failed\n", 1285 offer->chm_chanid); 1286 return; 1287 } 1288 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; 1293 1294 /* Batch reading is on by default */ 1295 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD; 1296 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; 1300 1301 if (offer->chm_flags1 & VMBUS_CHOFFER_FLAG1_HASMNF) { 1302 int trig_idx; 1303 1304 /* 1305 * Setup MNF stuffs. 1306 */ 1307 chan->ch_txflags |= VMBUS_CHAN_TXF_HASMNF; 1308 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); 1312 chan->ch_montrig = 1313 &sc->vmbus_mnf2->mnf_trigs[trig_idx].mt_pending; 1314 1315 chan->ch_montrig_mask = 1316 1 << (offer->chm_montrig % VMBUS_MONTRIG_LEN); 1317 } 1318 1319 /* 1320 * Setup event flag. 1321 */ 1322 chan->ch_evtflag = 1323 &sc->vmbus_tx_evtflags[chan->ch_id >> VMBUS_EVTFLAG_SHIFT]; 1324 chan->ch_evtflag_mask = 1UL << (chan->ch_id & VMBUS_EVTFLAG_MASK); 1325 1326 /* 1327 * Setup attach and detach tasks. 1328 */ 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; 1333 } else { 1334 chan->ch_mgmt_tq = sc->vmbus_subchtq; 1335 attach_fn = vmbus_subchan_attach_task; 1336 detach_fn = vmbus_subchan_detach_task; 1337 } 1338 TASK_INIT(&chan->ch_attach_task, 0, attach_fn, chan); 1339 TASK_INIT(&chan->ch_detach_task, 0, detach_fn, chan); 1340 1341 /* Select default cpu for this channel. */ 1342 vmbus_chan_cpu_default(chan); 1343 1344 error = vmbus_chan_add(chan); 1345 if (error) { 1346 device_printf(sc->vmbus_dev, "add chan%u failed: %d\n", 1347 chan->ch_id, error); 1348 vmbus_chan_free(chan); 1349 return; 1350 } 1351 taskqueue_enqueue(chan->ch_mgmt_tq, &chan->ch_attach_task); 1352} 1353 1354static void 1355vmbus_chan_msgproc_chrescind(struct vmbus_softc *sc, 1356 const struct vmbus_message *msg) 1357{ 1358 const struct vmbus_chanmsg_chrescind *note; 1359 struct vmbus_channel *chan; 1360 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", 1364 note->chm_chanid); 1365 return; 1366 } 1367 1368 if (bootverbose) { 1369 device_printf(sc->vmbus_dev, "chan%u rescinded\n", 1370 note->chm_chanid); 1371 } 1372 1373 /* 1374 * Find and remove the target channel from the channel list. 1375 */ 1376 mtx_lock(&sc->vmbus_chan_lock); 1377 TAILQ_FOREACH(chan, &sc->vmbus_chans, ch_link) { 1378 if (chan->ch_id == note->chm_chanid) 1379 break; 1380 } 1381 if (chan == NULL) { 1382 mtx_unlock(&sc->vmbus_chan_lock); 1383 device_printf(sc->vmbus_dev, "chan%u is not offered\n", 1384 note->chm_chanid); 1385 return; 1386 } 1387 vmbus_chan_rem_list(sc, chan); 1388 mtx_unlock(&sc->vmbus_chan_lock); 1389 1390 if (VMBUS_CHAN_ISPRIMARY(chan)) { 1391 /* 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 1396 * this thread. 1397 */ 1398 mtx_lock(&sc->vmbus_prichan_lock); 1399 vmbus_chan_rem_prilist(sc, chan); 1400 mtx_unlock(&sc->vmbus_prichan_lock); 1401 } 1402 1403 /* Detach the target channel. */ 1404 taskqueue_enqueue(chan->ch_mgmt_tq, &chan->ch_detach_task); 1405} 1406 1407static int 1408vmbus_chan_release(struct vmbus_channel *chan) 1409{ 1410 struct vmbus_softc *sc = chan->ch_vmbus; 1411 struct vmbus_chanmsg_chfree *req; 1412 struct vmbus_msghc *mh; 1413 int error; 1414 1415 mh = vmbus_msghc_get(sc, sizeof(*req)); 1416 if (mh == NULL) { 1417 device_printf(sc->vmbus_dev, "can not get msg hypercall for " 1418 "chfree(chan%u)\n", chan->ch_id); 1419 return (ENXIO); 1420 } 1421 1422 req = vmbus_msghc_dataptr(mh); 1423 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHFREE; 1424 req->chm_chanid = chan->ch_id; 1425 1426 error = vmbus_msghc_exec_noresult(mh); 1427 vmbus_msghc_put(sc, mh); 1428 1429 if (error) { 1430 device_printf(sc->vmbus_dev, "chfree(chan%u) failed: %d", 1431 chan->ch_id, error); 1432 } else { 1433 if (bootverbose) { 1434 device_printf(sc->vmbus_dev, "chan%u freed\n", 1435 chan->ch_id); 1436 } 1437 } 1438 return (error); 1439} 1440 1441static void 1442vmbus_prichan_detach_task(void *xchan, int pending __unused) 1443{ 1444 struct vmbus_channel *chan = xchan; 1445 1446 KASSERT(VMBUS_CHAN_ISPRIMARY(chan), 1447 ("chan%u is not primary channel", chan->ch_id)); 1448 1449 /* Delete and detach the device associated with this channel. */ 1450 vmbus_delete_child(chan); 1451 1452 /* Release this channel (back to vmbus). */ 1453 vmbus_chan_release(chan); 1454 1455 /* Free this channel's resource. */ 1456 vmbus_chan_free(chan); 1457} 1458 1459static void 1460vmbus_subchan_detach_task(void *xchan, int pending __unused) 1461{ 1462 struct vmbus_channel *chan = xchan; 1463 struct vmbus_channel *pri_chan = chan->ch_prichan; 1464 1465 KASSERT(!VMBUS_CHAN_ISPRIMARY(chan), 1466 ("chan%u is primary channel", chan->ch_id)); 1467 1468 /* Release this channel (back to vmbus). */ 1469 vmbus_chan_release(chan); 1470 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. */ 1476 wakeup(pri_chan); 1477 1478 /* Free this channel's resource. */ 1479 vmbus_chan_free(chan); 1480} 1481 1482static void 1483vmbus_prichan_attach_task(void *xchan, int pending __unused) 1484{ 1485 1486 /* 1487 * Add device for this primary channel. 1488 */ 1489 vmbus_add_child(xchan); 1490} 1491 1492static void 1493vmbus_subchan_attach_task(void *xchan __unused, int pending __unused) 1494{ 1495 1496 /* Nothing */ 1497} 1498 1499void 1500vmbus_chan_destroy_all(struct vmbus_softc *sc) 1501{ 1502 1503 /* 1504 * Detach all devices and destroy the corresponding primary 1505 * channels. 1506 */ 1507 for (;;) { 1508 struct vmbus_channel *chan; 1509 1510 mtx_lock(&sc->vmbus_chan_lock); 1511 TAILQ_FOREACH(chan, &sc->vmbus_chans, ch_link) { 1512 if (VMBUS_CHAN_ISPRIMARY(chan)) 1513 break; 1514 } 1515 if (chan == NULL) { 1516 /* No more primary channels; done. */ 1517 mtx_unlock(&sc->vmbus_chan_lock); 1518 break; 1519 } 1520 vmbus_chan_rem_list(sc, chan); 1521 mtx_unlock(&sc->vmbus_chan_lock); 1522 1523 mtx_lock(&sc->vmbus_prichan_lock); 1524 vmbus_chan_rem_prilist(sc, chan); 1525 mtx_unlock(&sc->vmbus_prichan_lock); 1526 1527 taskqueue_enqueue(chan->ch_mgmt_tq, &chan->ch_detach_task); 1528 } 1529} 1530 1531/* 1532 * The channel whose vcpu binding is closest to the currect vcpu will 1533 * be selected. 1534 * If no multi-channel, always select primary channel. 1535 */ 1536struct vmbus_channel * 1537vmbus_chan_cpu2chan(struct vmbus_channel *prichan, int cpu) 1538{ 1539 struct vmbus_channel *sel, *chan; 1540 uint32_t vcpu, sel_dist; 1541 1542 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpuid %d", cpu)); 1543 if (TAILQ_EMPTY(&prichan->ch_subchans)) 1544 return prichan; 1545 1546 vcpu = VMBUS_PCPU_GET(prichan->ch_vmbus, vcpuid, cpu); 1547 1548#define CHAN_VCPU_DIST(ch, vcpu) \ 1549 (((ch)->ch_vcpuid > (vcpu)) ? \ 1550 ((ch)->ch_vcpuid - (vcpu)) : ((vcpu) - (ch)->ch_vcpuid)) 1551 1552#define CHAN_SELECT(ch) \ 1553do { \ 1554 sel = ch; \ 1555 sel_dist = CHAN_VCPU_DIST(ch, vcpu); \ 1556} while (0) 1557 1558 CHAN_SELECT(prichan); 1559 1560 mtx_lock(&prichan->ch_subchan_lock); 1561 TAILQ_FOREACH(chan, &prichan->ch_subchans, ch_sublink) { 1562 uint32_t dist; 1563 1564 KASSERT(chan->ch_stflags & VMBUS_CHAN_ST_OPENED, 1565 ("chan%u is not opened", chan->ch_id)); 1566 1567 if (chan->ch_vcpuid == vcpu) { 1568 /* Exact match; done */ 1569 CHAN_SELECT(chan); 1570 break; 1571 } 1572 1573 dist = CHAN_VCPU_DIST(chan, vcpu); 1574 if (sel_dist <= dist) { 1575 /* Far or same distance; skip */ 1576 continue; 1577 } 1578 1579 /* Select the closer channel. */ 1580 CHAN_SELECT(chan); 1581 } 1582 mtx_unlock(&prichan->ch_subchan_lock); 1583 1584#undef CHAN_SELECT 1585#undef CHAN_VCPU_DIST 1586 1587 return sel; 1588} 1589 1590struct vmbus_channel ** 1591vmbus_subchan_get(struct vmbus_channel *pri_chan, int subchan_cnt) 1592{ 1593 struct vmbus_channel **ret, *chan; 1594 int i; 1595 1596 KASSERT(subchan_cnt > 0, ("invalid sub-channel count %d", subchan_cnt)); 1597 1598 ret = malloc(subchan_cnt * sizeof(struct vmbus_channel *), M_TEMP, 1599 M_WAITOK); 1600 1601 mtx_lock(&pri_chan->ch_subchan_lock); 1602 1603 while (pri_chan->ch_subchan_cnt < subchan_cnt) 1604 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "subch", 0); 1605 1606 i = 0; 1607 TAILQ_FOREACH(chan, &pri_chan->ch_subchans, ch_sublink) { 1608 /* TODO: refcnt chan */ 1609 ret[i] = chan; 1610 1611 ++i; 1612 if (i == subchan_cnt) 1613 break; 1614 } 1615 KASSERT(i == subchan_cnt, ("invalid subchan count %d, should be %d", 1616 pri_chan->ch_subchan_cnt, subchan_cnt)); 1617 1618 mtx_unlock(&pri_chan->ch_subchan_lock); 1619 1620 return ret; 1621} 1622 1623void 1624vmbus_subchan_rel(struct vmbus_channel **subchan, int subchan_cnt __unused) 1625{ 1626 1627 free(subchan, M_TEMP); 1628} 1629 1630void 1631vmbus_subchan_drain(struct vmbus_channel *pri_chan) 1632{ 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); 1637} 1638 1639void 1640vmbus_chan_msgproc(struct vmbus_softc *sc, const struct vmbus_message *msg) 1641{ 1642 vmbus_chanmsg_proc_t msg_proc; 1643 uint32_t msg_type; 1644 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)); 1648 1649 msg_proc = vmbus_chan_msgprocs[msg_type]; 1650 if (msg_proc != NULL) 1651 msg_proc(sc, msg); 1652} 1653 1654void 1655vmbus_chan_set_readbatch(struct vmbus_channel *chan, bool on) 1656{ 1657 if (!on) 1658 chan->ch_flags &= ~VMBUS_CHAN_FLAG_BATCHREAD; 1659 else 1660 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD; 1661} 1662 1663uint32_t 1664vmbus_chan_id(const struct vmbus_channel *chan) 1665{ 1666 return chan->ch_id; 1667} 1668 1669uint32_t 1670vmbus_chan_subidx(const struct vmbus_channel *chan) 1671{ 1672 return chan->ch_subidx; 1673} 1674 1675bool 1676vmbus_chan_is_primary(const struct vmbus_channel *chan) 1677{ 1678 if (VMBUS_CHAN_ISPRIMARY(chan)) 1679 return true; 1680 else 1681 return false; 1682} 1683 1684const struct hyperv_guid * 1685vmbus_chan_guid_inst(const struct vmbus_channel *chan) 1686{ 1687 return &chan->ch_guid_inst; 1688} 1689 1690int 1691vmbus_chan_prplist_nelem(int br_size, int prpcnt_max, int dlen_max) 1692{ 1693 int elem_size; 1694 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); 1699 1700 return (vmbus_br_nelem(br_size, elem_size)); 1701} 1702 1703bool 1704vmbus_chan_tx_empty(const struct vmbus_channel *chan) 1705{ 1706 1707 return (vmbus_txbr_empty(&chan->ch_txbr)); 1708} 1709 1710bool 1711vmbus_chan_rx_empty(const struct vmbus_channel *chan) 1712{ 1713 1714 return (vmbus_rxbr_empty(&chan->ch_rxbr)); 1715} 1716 1717void 1718vmbus_chan_run_task(struct vmbus_channel *chan, struct task *task) 1719{ 1720 1721 taskqueue_enqueue(chan->ch_tq, task); 1722 taskqueue_drain(chan->ch_tq, task); 1723} 1724 1725struct taskqueue * 1726vmbus_chan_mgmt_tq(const struct vmbus_channel *chan) 1727{ 1728 1729 return (chan->ch_mgmt_tq); 1730} 1731