vmbus_chan.c revision 307461
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 307461 2016-10-17 03:24:03Z sephe $"); 31 32#include <sys/param.h> 33#include <sys/kernel.h> 34#include <sys/malloc.h> 35#include <sys/systm.h> 36#include <sys/mbuf.h> 37#include <sys/lock.h> 38#include <sys/mutex.h> 39#include <sys/sysctl.h> 40 41#include <machine/atomic.h> 42#include <machine/bus.h> 43 44#include <vm/vm.h> 45#include <vm/vm_param.h> 46#include <vm/pmap.h> 47 48#include <dev/hyperv/include/hyperv_busdma.h> 49#include <dev/hyperv/vmbus/hv_vmbus_priv.h> 50#include <dev/hyperv/vmbus/hyperv_var.h> 51#include <dev/hyperv/vmbus/vmbus_reg.h> 52#include <dev/hyperv/vmbus/vmbus_var.h> 53 54static void vmbus_chan_update_evtflagcnt(struct vmbus_softc *, 55 const struct vmbus_channel *); 56 57static void vmbus_chan_task(void *, int); 58static void vmbus_chan_task_nobatch(void *, int); 59static void vmbus_chan_detach_task(void *, int); 60 61static void vmbus_chan_msgproc_choffer(struct vmbus_softc *, 62 const struct vmbus_message *); 63static void vmbus_chan_msgproc_chrescind(struct vmbus_softc *, 64 const struct vmbus_message *); 65 66/* 67 * Vmbus channel message processing. 68 */ 69static const vmbus_chanmsg_proc_t 70vmbus_chan_msgprocs[VMBUS_CHANMSG_TYPE_MAX] = { 71 VMBUS_CHANMSG_PROC(CHOFFER, vmbus_chan_msgproc_choffer), 72 VMBUS_CHANMSG_PROC(CHRESCIND, vmbus_chan_msgproc_chrescind), 73 74 VMBUS_CHANMSG_PROC_WAKEUP(CHOPEN_RESP), 75 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_CONNRESP), 76 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_DISCONNRESP) 77}; 78 79/* 80 * Notify host that there are data pending on our TX bufring. 81 */ 82static __inline void 83vmbus_chan_signal_tx(const struct vmbus_channel *chan) 84{ 85 atomic_set_long(chan->ch_evtflag, chan->ch_evtflag_mask); 86 if (chan->ch_txflags & VMBUS_CHAN_TXF_HASMNF) 87 atomic_set_int(chan->ch_montrig, chan->ch_montrig_mask); 88 else 89 hypercall_signal_event(chan->ch_monprm_dma.hv_paddr); 90} 91 92static int 93vmbus_chan_sysctl_mnf(SYSCTL_HANDLER_ARGS) 94{ 95 struct vmbus_channel *chan = arg1; 96 int mnf = 0; 97 98 if (chan->ch_txflags & VMBUS_CHAN_TXF_HASMNF) 99 mnf = 1; 100 return sysctl_handle_int(oidp, &mnf, 0, req); 101} 102 103static void 104vmbus_chan_sysctl_create(struct vmbus_channel *chan) 105{ 106 struct sysctl_oid *ch_tree, *chid_tree, *br_tree; 107 struct sysctl_ctx_list *ctx; 108 uint32_t ch_id; 109 char name[16]; 110 111 /* 112 * Add sysctl nodes related to this channel to this 113 * channel's sysctl ctx, so that they can be destroyed 114 * independently upon close of this channel, which can 115 * happen even if the device is not detached. 116 */ 117 ctx = &chan->ch_sysctl_ctx; 118 sysctl_ctx_init(ctx); 119 120 /* 121 * Create dev.NAME.UNIT.channel tree. 122 */ 123 ch_tree = SYSCTL_ADD_NODE(ctx, 124 SYSCTL_CHILDREN(device_get_sysctl_tree(chan->ch_dev)), 125 OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 126 if (ch_tree == NULL) 127 return; 128 129 /* 130 * Create dev.NAME.UNIT.channel.CHANID tree. 131 */ 132 if (VMBUS_CHAN_ISPRIMARY(chan)) 133 ch_id = chan->ch_id; 134 else 135 ch_id = chan->ch_prichan->ch_id; 136 snprintf(name, sizeof(name), "%d", ch_id); 137 chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree), 138 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 139 if (chid_tree == NULL) 140 return; 141 142 if (!VMBUS_CHAN_ISPRIMARY(chan)) { 143 /* 144 * Create dev.NAME.UNIT.channel.CHANID.sub tree. 145 */ 146 ch_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), 147 OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 148 if (ch_tree == NULL) 149 return; 150 151 /* 152 * Create dev.NAME.UNIT.channel.CHANID.sub.SUBIDX tree. 153 * 154 * NOTE: 155 * chid_tree is changed to this new sysctl tree. 156 */ 157 snprintf(name, sizeof(name), "%d", chan->ch_subidx); 158 chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree), 159 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 160 if (chid_tree == NULL) 161 return; 162 163 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 164 "chanid", CTLFLAG_RD, &chan->ch_id, 0, "channel id"); 165 } 166 167 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 168 "cpu", CTLFLAG_RD, &chan->ch_cpuid, 0, "owner CPU id"); 169 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 170 "mnf", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 171 chan, 0, vmbus_chan_sysctl_mnf, "I", 172 "has monitor notification facilities"); 173 174 /* 175 * Create sysctl tree for RX bufring. 176 */ 177 br_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 178 "in", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 179 if (br_tree != NULL) { 180 hv_ring_buffer_stat(ctx, SYSCTL_CHILDREN(br_tree), 181 &chan->ch_rxbr, "inbound ring buffer stats"); 182 } 183 184 /* 185 * Create sysctl tree for TX bufring. 186 */ 187 br_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 188 "out", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 189 if (br_tree != NULL) { 190 hv_ring_buffer_stat(ctx, SYSCTL_CHILDREN(br_tree), 191 &chan->ch_txbr, "outbound ring buffer stats"); 192 } 193} 194 195int 196vmbus_chan_open(struct vmbus_channel *chan, int txbr_size, int rxbr_size, 197 const void *udata, int udlen, vmbus_chan_callback_t cb, void *cbarg) 198{ 199 struct vmbus_softc *sc = chan->ch_vmbus; 200 const struct vmbus_chanmsg_chopen_resp *resp; 201 const struct vmbus_message *msg; 202 struct vmbus_chanmsg_chopen *req; 203 struct vmbus_msghc *mh; 204 uint32_t status; 205 int error; 206 uint8_t *br; 207 208 if (udlen > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) { 209 device_printf(sc->vmbus_dev, 210 "invalid udata len %d for chan%u\n", udlen, chan->ch_id); 211 return EINVAL; 212 } 213 KASSERT((txbr_size & PAGE_MASK) == 0, 214 ("send bufring size is not multiple page")); 215 KASSERT((rxbr_size & PAGE_MASK) == 0, 216 ("recv bufring size is not multiple page")); 217 218 if (atomic_testandset_int(&chan->ch_stflags, 219 VMBUS_CHAN_ST_OPENED_SHIFT)) 220 panic("double-open chan%u", chan->ch_id); 221 222 chan->ch_cb = cb; 223 chan->ch_cbarg = cbarg; 224 225 vmbus_chan_update_evtflagcnt(sc, chan); 226 227 chan->ch_tq = VMBUS_PCPU_GET(chan->ch_vmbus, event_tq, chan->ch_cpuid); 228 if (chan->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) 229 TASK_INIT(&chan->ch_task, 0, vmbus_chan_task, chan); 230 else 231 TASK_INIT(&chan->ch_task, 0, vmbus_chan_task_nobatch, chan); 232 233 /* 234 * Allocate the TX+RX bufrings. 235 * XXX should use ch_dev dtag 236 */ 237 br = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev), 238 PAGE_SIZE, 0, txbr_size + rxbr_size, &chan->ch_bufring_dma, 239 BUS_DMA_WAITOK | BUS_DMA_ZERO); 240 if (br == NULL) { 241 device_printf(sc->vmbus_dev, "bufring allocation failed\n"); 242 error = ENOMEM; 243 goto failed; 244 } 245 chan->ch_bufring = br; 246 247 /* TX bufring comes first */ 248 hv_vmbus_ring_buffer_init(&chan->ch_txbr, br, txbr_size); 249 /* RX bufring immediately follows TX bufring */ 250 hv_vmbus_ring_buffer_init(&chan->ch_rxbr, br + txbr_size, rxbr_size); 251 252 /* Create sysctl tree for this channel */ 253 vmbus_chan_sysctl_create(chan); 254 255 /* 256 * Connect the bufrings, both RX and TX, to this channel. 257 */ 258 error = vmbus_chan_gpadl_connect(chan, chan->ch_bufring_dma.hv_paddr, 259 txbr_size + rxbr_size, &chan->ch_bufring_gpadl); 260 if (error) { 261 device_printf(sc->vmbus_dev, 262 "failed to connect bufring GPADL to chan%u\n", chan->ch_id); 263 goto failed; 264 } 265 266 /* 267 * Open channel w/ the bufring GPADL on the target CPU. 268 */ 269 mh = vmbus_msghc_get(sc, sizeof(*req)); 270 if (mh == NULL) { 271 device_printf(sc->vmbus_dev, 272 "can not get msg hypercall for chopen(chan%u)\n", 273 chan->ch_id); 274 error = ENXIO; 275 goto failed; 276 } 277 278 req = vmbus_msghc_dataptr(mh); 279 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN; 280 req->chm_chanid = chan->ch_id; 281 req->chm_openid = chan->ch_id; 282 req->chm_gpadl = chan->ch_bufring_gpadl; 283 req->chm_vcpuid = chan->ch_vcpuid; 284 req->chm_txbr_pgcnt = txbr_size >> PAGE_SHIFT; 285 if (udlen > 0) 286 memcpy(req->chm_udata, udata, udlen); 287 288 error = vmbus_msghc_exec(sc, mh); 289 if (error) { 290 device_printf(sc->vmbus_dev, 291 "chopen(chan%u) msg hypercall exec failed: %d\n", 292 chan->ch_id, error); 293 vmbus_msghc_put(sc, mh); 294 goto failed; 295 } 296 297 msg = vmbus_msghc_wait_result(sc, mh); 298 resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data; 299 status = resp->chm_status; 300 301 vmbus_msghc_put(sc, mh); 302 303 if (status == 0) { 304 if (bootverbose) { 305 device_printf(sc->vmbus_dev, "chan%u opened\n", 306 chan->ch_id); 307 } 308 return 0; 309 } 310 311 device_printf(sc->vmbus_dev, "failed to open chan%u\n", chan->ch_id); 312 error = ENXIO; 313 314failed: 315 if (chan->ch_bufring_gpadl) { 316 vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl); 317 chan->ch_bufring_gpadl = 0; 318 } 319 if (chan->ch_bufring != NULL) { 320 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring); 321 chan->ch_bufring = NULL; 322 } 323 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED); 324 return error; 325} 326 327int 328vmbus_chan_gpadl_connect(struct vmbus_channel *chan, bus_addr_t paddr, 329 int size, uint32_t *gpadl0) 330{ 331 struct vmbus_softc *sc = chan->ch_vmbus; 332 struct vmbus_msghc *mh; 333 struct vmbus_chanmsg_gpadl_conn *req; 334 const struct vmbus_message *msg; 335 size_t reqsz; 336 uint32_t gpadl, status; 337 int page_count, range_len, i, cnt, error; 338 uint64_t page_id; 339 340 /* 341 * Preliminary checks. 342 */ 343 344 KASSERT((size & PAGE_MASK) == 0, 345 ("invalid GPA size %d, not multiple page size", size)); 346 page_count = size >> PAGE_SHIFT; 347 348 KASSERT((paddr & PAGE_MASK) == 0, 349 ("GPA is not page aligned %jx", (uintmax_t)paddr)); 350 page_id = paddr >> PAGE_SHIFT; 351 352 range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); 353 /* 354 * We don't support multiple GPA ranges. 355 */ 356 if (range_len > UINT16_MAX) { 357 device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", 358 page_count); 359 return EOPNOTSUPP; 360 } 361 362 /* 363 * Allocate GPADL id. 364 */ 365 gpadl = vmbus_gpadl_alloc(sc); 366 *gpadl0 = gpadl; 367 368 /* 369 * Connect this GPADL to the target channel. 370 * 371 * NOTE: 372 * Since each message can only hold small set of page 373 * addresses, several messages may be required to 374 * complete the connection. 375 */ 376 if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) 377 cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; 378 else 379 cnt = page_count; 380 page_count -= cnt; 381 382 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, 383 chm_range.gpa_page[cnt]); 384 mh = vmbus_msghc_get(sc, reqsz); 385 if (mh == NULL) { 386 device_printf(sc->vmbus_dev, 387 "can not get msg hypercall for gpadl->chan%u\n", 388 chan->ch_id); 389 return EIO; 390 } 391 392 req = vmbus_msghc_dataptr(mh); 393 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN; 394 req->chm_chanid = chan->ch_id; 395 req->chm_gpadl = gpadl; 396 req->chm_range_len = range_len; 397 req->chm_range_cnt = 1; 398 req->chm_range.gpa_len = size; 399 req->chm_range.gpa_ofs = 0; 400 for (i = 0; i < cnt; ++i) 401 req->chm_range.gpa_page[i] = page_id++; 402 403 error = vmbus_msghc_exec(sc, mh); 404 if (error) { 405 device_printf(sc->vmbus_dev, 406 "gpadl->chan%u msg hypercall exec failed: %d\n", 407 chan->ch_id, error); 408 vmbus_msghc_put(sc, mh); 409 return error; 410 } 411 412 while (page_count > 0) { 413 struct vmbus_chanmsg_gpadl_subconn *subreq; 414 415 if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) 416 cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; 417 else 418 cnt = page_count; 419 page_count -= cnt; 420 421 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, 422 chm_gpa_page[cnt]); 423 vmbus_msghc_reset(mh, reqsz); 424 425 subreq = vmbus_msghc_dataptr(mh); 426 subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN; 427 subreq->chm_gpadl = gpadl; 428 for (i = 0; i < cnt; ++i) 429 subreq->chm_gpa_page[i] = page_id++; 430 431 vmbus_msghc_exec_noresult(mh); 432 } 433 KASSERT(page_count == 0, ("invalid page count %d", page_count)); 434 435 msg = vmbus_msghc_wait_result(sc, mh); 436 status = ((const struct vmbus_chanmsg_gpadl_connresp *) 437 msg->msg_data)->chm_status; 438 439 vmbus_msghc_put(sc, mh); 440 441 if (status != 0) { 442 device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " 443 "status %u\n", chan->ch_id, status); 444 return EIO; 445 } else { 446 if (bootverbose) { 447 device_printf(sc->vmbus_dev, "gpadl->chan%u " 448 "succeeded\n", chan->ch_id); 449 } 450 } 451 return 0; 452} 453 454/* 455 * Disconnect the GPA from the target channel 456 */ 457int 458vmbus_chan_gpadl_disconnect(struct vmbus_channel *chan, uint32_t gpadl) 459{ 460 struct vmbus_softc *sc = chan->ch_vmbus; 461 struct vmbus_msghc *mh; 462 struct vmbus_chanmsg_gpadl_disconn *req; 463 int error; 464 465 mh = vmbus_msghc_get(sc, sizeof(*req)); 466 if (mh == NULL) { 467 device_printf(sc->vmbus_dev, 468 "can not get msg hypercall for gpa x->chan%u\n", 469 chan->ch_id); 470 return EBUSY; 471 } 472 473 req = vmbus_msghc_dataptr(mh); 474 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN; 475 req->chm_chanid = chan->ch_id; 476 req->chm_gpadl = gpadl; 477 478 error = vmbus_msghc_exec(sc, mh); 479 if (error) { 480 device_printf(sc->vmbus_dev, 481 "gpa x->chan%u msg hypercall exec failed: %d\n", 482 chan->ch_id, error); 483 vmbus_msghc_put(sc, mh); 484 return error; 485 } 486 487 vmbus_msghc_wait_result(sc, mh); 488 /* Discard result; no useful information */ 489 vmbus_msghc_put(sc, mh); 490 491 return 0; 492} 493 494static void 495vmbus_chan_close_internal(struct vmbus_channel *chan) 496{ 497 struct vmbus_softc *sc = chan->ch_vmbus; 498 struct vmbus_msghc *mh; 499 struct vmbus_chanmsg_chclose *req; 500 struct taskqueue *tq = chan->ch_tq; 501 int error; 502 503 /* TODO: stringent check */ 504 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED); 505 506 /* 507 * Free this channel's sysctl tree attached to its device's 508 * sysctl tree. 509 */ 510 sysctl_ctx_free(&chan->ch_sysctl_ctx); 511 512 /* 513 * Set ch_tq to NULL to avoid more requests be scheduled. 514 * XXX pretty broken; need rework. 515 */ 516 chan->ch_tq = NULL; 517 taskqueue_drain(tq, &chan->ch_task); 518 chan->ch_cb = NULL; 519 520 /* 521 * Close this channel. 522 */ 523 mh = vmbus_msghc_get(sc, sizeof(*req)); 524 if (mh == NULL) { 525 device_printf(sc->vmbus_dev, 526 "can not get msg hypercall for chclose(chan%u)\n", 527 chan->ch_id); 528 return; 529 } 530 531 req = vmbus_msghc_dataptr(mh); 532 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; 533 req->chm_chanid = chan->ch_id; 534 535 error = vmbus_msghc_exec_noresult(mh); 536 vmbus_msghc_put(sc, mh); 537 538 if (error) { 539 device_printf(sc->vmbus_dev, 540 "chclose(chan%u) msg hypercall exec failed: %d\n", 541 chan->ch_id, error); 542 return; 543 } else if (bootverbose) { 544 device_printf(sc->vmbus_dev, "close chan%u\n", chan->ch_id); 545 } 546 547 /* 548 * Disconnect the TX+RX bufrings from this channel. 549 */ 550 if (chan->ch_bufring_gpadl) { 551 vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl); 552 chan->ch_bufring_gpadl = 0; 553 } 554 555 /* 556 * Destroy the TX+RX bufrings. 557 */ 558 hv_ring_buffer_cleanup(&chan->ch_txbr); 559 hv_ring_buffer_cleanup(&chan->ch_rxbr); 560 if (chan->ch_bufring != NULL) { 561 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring); 562 chan->ch_bufring = NULL; 563 } 564} 565 566/* 567 * Caller should make sure that all sub-channels have 568 * been added to 'chan' and all to-be-closed channels 569 * are not being opened. 570 */ 571void 572vmbus_chan_close(struct vmbus_channel *chan) 573{ 574 int subchan_cnt; 575 576 if (!VMBUS_CHAN_ISPRIMARY(chan)) { 577 /* 578 * Sub-channel is closed when its primary channel 579 * is closed; done. 580 */ 581 return; 582 } 583 584 /* 585 * Close all sub-channels, if any. 586 */ 587 subchan_cnt = chan->ch_subchan_cnt; 588 if (subchan_cnt > 0) { 589 struct vmbus_channel **subchan; 590 int i; 591 592 subchan = vmbus_subchan_get(chan, subchan_cnt); 593 for (i = 0; i < subchan_cnt; ++i) 594 vmbus_chan_close_internal(subchan[i]); 595 vmbus_subchan_rel(subchan, subchan_cnt); 596 } 597 598 /* Then close the primary channel. */ 599 vmbus_chan_close_internal(chan); 600} 601 602int 603vmbus_chan_send(struct vmbus_channel *chan, uint16_t type, uint16_t flags, 604 void *data, int dlen, uint64_t xactid) 605{ 606 struct vmbus_chanpkt pkt; 607 int pktlen, pad_pktlen, hlen, error; 608 uint64_t pad = 0; 609 struct iovec iov[3]; 610 boolean_t send_evt; 611 612 hlen = sizeof(pkt); 613 pktlen = hlen + dlen; 614 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 615 616 pkt.cp_hdr.cph_type = type; 617 pkt.cp_hdr.cph_flags = flags; 618 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 619 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 620 pkt.cp_hdr.cph_xactid = xactid; 621 622 iov[0].iov_base = &pkt; 623 iov[0].iov_len = hlen; 624 iov[1].iov_base = data; 625 iov[1].iov_len = dlen; 626 iov[2].iov_base = &pad; 627 iov[2].iov_len = pad_pktlen - pktlen; 628 629 error = hv_ring_buffer_write(&chan->ch_txbr, iov, 3, &send_evt); 630 if (!error && send_evt) 631 vmbus_chan_signal_tx(chan); 632 return error; 633} 634 635int 636vmbus_chan_send_sglist(struct vmbus_channel *chan, 637 struct vmbus_gpa sg[], int sglen, void *data, int dlen, uint64_t xactid) 638{ 639 struct vmbus_chanpkt_sglist pkt; 640 int pktlen, pad_pktlen, hlen, error; 641 struct iovec iov[4]; 642 boolean_t send_evt; 643 uint64_t pad = 0; 644 645 KASSERT(sglen < VMBUS_CHAN_SGLIST_MAX, 646 ("invalid sglist len %d", sglen)); 647 648 hlen = __offsetof(struct vmbus_chanpkt_sglist, cp_gpa[sglen]); 649 pktlen = hlen + dlen; 650 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 651 652 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; 653 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; 654 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 655 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 656 pkt.cp_hdr.cph_xactid = xactid; 657 pkt.cp_rsvd = 0; 658 pkt.cp_gpa_cnt = sglen; 659 660 iov[0].iov_base = &pkt; 661 iov[0].iov_len = sizeof(pkt); 662 iov[1].iov_base = sg; 663 iov[1].iov_len = sizeof(struct vmbus_gpa) * sglen; 664 iov[2].iov_base = data; 665 iov[2].iov_len = dlen; 666 iov[3].iov_base = &pad; 667 iov[3].iov_len = pad_pktlen - pktlen; 668 669 error = hv_ring_buffer_write(&chan->ch_txbr, iov, 4, &send_evt); 670 if (!error && send_evt) 671 vmbus_chan_signal_tx(chan); 672 return error; 673} 674 675int 676vmbus_chan_send_prplist(struct vmbus_channel *chan, 677 struct vmbus_gpa_range *prp, int prp_cnt, void *data, int dlen, 678 uint64_t xactid) 679{ 680 struct vmbus_chanpkt_prplist pkt; 681 int pktlen, pad_pktlen, hlen, error; 682 struct iovec iov[4]; 683 boolean_t send_evt; 684 uint64_t pad = 0; 685 686 KASSERT(prp_cnt < VMBUS_CHAN_PRPLIST_MAX, 687 ("invalid prplist entry count %d", prp_cnt)); 688 689 hlen = __offsetof(struct vmbus_chanpkt_prplist, 690 cp_range[0].gpa_page[prp_cnt]); 691 pktlen = hlen + dlen; 692 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 693 694 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; 695 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; 696 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 697 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 698 pkt.cp_hdr.cph_xactid = xactid; 699 pkt.cp_rsvd = 0; 700 pkt.cp_range_cnt = 1; 701 702 iov[0].iov_base = &pkt; 703 iov[0].iov_len = sizeof(pkt); 704 iov[1].iov_base = prp; 705 iov[1].iov_len = __offsetof(struct vmbus_gpa_range, gpa_page[prp_cnt]); 706 iov[2].iov_base = data; 707 iov[2].iov_len = dlen; 708 iov[3].iov_base = &pad; 709 iov[3].iov_len = pad_pktlen - pktlen; 710 711 error = hv_ring_buffer_write(&chan->ch_txbr, iov, 4, &send_evt); 712 if (!error && send_evt) 713 vmbus_chan_signal_tx(chan); 714 return error; 715} 716 717int 718vmbus_chan_recv(struct vmbus_channel *chan, void *data, int *dlen0, 719 uint64_t *xactid) 720{ 721 struct vmbus_chanpkt_hdr pkt; 722 int error, dlen, hlen; 723 724 error = hv_ring_buffer_peek(&chan->ch_rxbr, &pkt, sizeof(pkt)); 725 if (error) 726 return error; 727 728 hlen = VMBUS_CHANPKT_GETLEN(pkt.cph_hlen); 729 dlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen) - hlen; 730 731 if (*dlen0 < dlen) { 732 /* Return the size of this packet's data. */ 733 *dlen0 = dlen; 734 return ENOBUFS; 735 } 736 737 *xactid = pkt.cph_xactid; 738 *dlen0 = dlen; 739 740 /* Skip packet header */ 741 error = hv_ring_buffer_read(&chan->ch_rxbr, data, dlen, hlen); 742 KASSERT(!error, ("hv_ring_buffer_read failed")); 743 744 return 0; 745} 746 747int 748vmbus_chan_recv_pkt(struct vmbus_channel *chan, 749 struct vmbus_chanpkt_hdr *pkt0, int *pktlen0) 750{ 751 struct vmbus_chanpkt_hdr pkt; 752 int error, pktlen; 753 754 error = hv_ring_buffer_peek(&chan->ch_rxbr, &pkt, sizeof(pkt)); 755 if (error) 756 return error; 757 758 pktlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen); 759 if (*pktlen0 < pktlen) { 760 /* Return the size of this packet. */ 761 *pktlen0 = pktlen; 762 return ENOBUFS; 763 } 764 *pktlen0 = pktlen; 765 766 /* Include packet header */ 767 error = hv_ring_buffer_read(&chan->ch_rxbr, pkt0, pktlen, 0); 768 KASSERT(!error, ("hv_ring_buffer_read failed")); 769 770 return 0; 771} 772 773static void 774vmbus_chan_task(void *xchan, int pending __unused) 775{ 776 struct vmbus_channel *chan = xchan; 777 vmbus_chan_callback_t cb = chan->ch_cb; 778 void *cbarg = chan->ch_cbarg; 779 780 /* 781 * Optimize host to guest signaling by ensuring: 782 * 1. While reading the channel, we disable interrupts from 783 * host. 784 * 2. Ensure that we process all posted messages from the host 785 * before returning from this callback. 786 * 3. Once we return, enable signaling from the host. Once this 787 * state is set we check to see if additional packets are 788 * available to read. In this case we repeat the process. 789 * 790 * NOTE: Interrupt has been disabled in the ISR. 791 */ 792 for (;;) { 793 uint32_t left; 794 795 cb(chan, cbarg); 796 797 left = hv_ring_buffer_read_end(&chan->ch_rxbr); 798 if (left == 0) { 799 /* No more data in RX bufring; done */ 800 break; 801 } 802 hv_ring_buffer_read_begin(&chan->ch_rxbr); 803 } 804} 805 806static void 807vmbus_chan_task_nobatch(void *xchan, int pending __unused) 808{ 809 struct vmbus_channel *chan = xchan; 810 811 chan->ch_cb(chan, chan->ch_cbarg); 812} 813 814static __inline void 815vmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags, 816 int flag_cnt) 817{ 818 int f; 819 820 for (f = 0; f < flag_cnt; ++f) { 821 uint32_t chid_base; 822 u_long flags; 823 int chid_ofs; 824 825 if (event_flags[f] == 0) 826 continue; 827 828 flags = atomic_swap_long(&event_flags[f], 0); 829 chid_base = f << VMBUS_EVTFLAG_SHIFT; 830 831 while ((chid_ofs = ffsl(flags)) != 0) { 832 struct vmbus_channel *chan; 833 834 --chid_ofs; /* NOTE: ffsl is 1-based */ 835 flags &= ~(1UL << chid_ofs); 836 837 chan = sc->vmbus_chmap[chid_base + chid_ofs]; 838 839 /* if channel is closed or closing */ 840 if (chan == NULL || chan->ch_tq == NULL) 841 continue; 842 843 if (chan->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) 844 hv_ring_buffer_read_begin(&chan->ch_rxbr); 845 taskqueue_enqueue(chan->ch_tq, &chan->ch_task); 846 } 847 } 848} 849 850void 851vmbus_event_proc(struct vmbus_softc *sc, int cpu) 852{ 853 struct vmbus_evtflags *eventf; 854 855 /* 856 * On Host with Win8 or above, the event page can be checked directly 857 * to get the id of the channel that has the pending interrupt. 858 */ 859 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 860 vmbus_event_flags_proc(sc, eventf->evt_flags, 861 VMBUS_PCPU_GET(sc, event_flags_cnt, cpu)); 862} 863 864void 865vmbus_event_proc_compat(struct vmbus_softc *sc, int cpu) 866{ 867 struct vmbus_evtflags *eventf; 868 869 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 870 if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) { 871 vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags, 872 VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT); 873 } 874} 875 876static void 877vmbus_chan_update_evtflagcnt(struct vmbus_softc *sc, 878 const struct vmbus_channel *chan) 879{ 880 volatile int *flag_cnt_ptr; 881 int flag_cnt; 882 883 flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1; 884 flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->ch_cpuid); 885 886 for (;;) { 887 int old_flag_cnt; 888 889 old_flag_cnt = *flag_cnt_ptr; 890 if (old_flag_cnt >= flag_cnt) 891 break; 892 if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) { 893 if (bootverbose) { 894 device_printf(sc->vmbus_dev, 895 "channel%u update cpu%d flag_cnt to %d\n", 896 chan->ch_id, chan->ch_cpuid, flag_cnt); 897 } 898 break; 899 } 900 } 901} 902 903static struct vmbus_channel * 904vmbus_chan_alloc(struct vmbus_softc *sc) 905{ 906 struct vmbus_channel *chan; 907 908 chan = malloc(sizeof(*chan), M_DEVBUF, M_WAITOK | M_ZERO); 909 910 chan->ch_monprm = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev), 911 HYPERCALL_PARAM_ALIGN, 0, sizeof(struct hyperv_mon_param), 912 &chan->ch_monprm_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); 913 if (chan->ch_monprm == NULL) { 914 device_printf(sc->vmbus_dev, "monprm alloc failed\n"); 915 free(chan, M_DEVBUF); 916 return NULL; 917 } 918 919 chan->ch_vmbus = sc; 920 mtx_init(&chan->ch_subchan_lock, "vmbus subchan", NULL, MTX_DEF); 921 TAILQ_INIT(&chan->ch_subchans); 922 TASK_INIT(&chan->ch_detach_task, 0, vmbus_chan_detach_task, chan); 923 924 return chan; 925} 926 927static void 928vmbus_chan_free(struct vmbus_channel *chan) 929{ 930 /* TODO: assert sub-channel list is empty */ 931 /* TODO: asset no longer on the primary channel's sub-channel list */ 932 /* TODO: asset no longer on the vmbus channel list */ 933 hyperv_dmamem_free(&chan->ch_monprm_dma, chan->ch_monprm); 934 mtx_destroy(&chan->ch_subchan_lock); 935 free(chan, M_DEVBUF); 936} 937 938static int 939vmbus_chan_add(struct vmbus_channel *newchan) 940{ 941 struct vmbus_softc *sc = newchan->ch_vmbus; 942 struct vmbus_channel *prichan; 943 944 if (newchan->ch_id == 0) { 945 /* 946 * XXX 947 * Chan0 will neither be processed nor should be offered; 948 * skip it. 949 */ 950 device_printf(sc->vmbus_dev, "got chan0 offer, discard\n"); 951 return EINVAL; 952 } else if (newchan->ch_id >= VMBUS_CHAN_MAX) { 953 device_printf(sc->vmbus_dev, "invalid chan%u offer\n", 954 newchan->ch_id); 955 return EINVAL; 956 } 957 sc->vmbus_chmap[newchan->ch_id] = newchan; 958 959 if (bootverbose) { 960 device_printf(sc->vmbus_dev, "chan%u subidx%u offer\n", 961 newchan->ch_id, newchan->ch_subidx); 962 } 963 964 mtx_lock(&sc->vmbus_prichan_lock); 965 TAILQ_FOREACH(prichan, &sc->vmbus_prichans, ch_prilink) { 966 /* 967 * Sub-channel will have the same type GUID and instance 968 * GUID as its primary channel. 969 */ 970 if (memcmp(&prichan->ch_guid_type, &newchan->ch_guid_type, 971 sizeof(struct hyperv_guid)) == 0 && 972 memcmp(&prichan->ch_guid_inst, &newchan->ch_guid_inst, 973 sizeof(struct hyperv_guid)) == 0) 974 break; 975 } 976 if (VMBUS_CHAN_ISPRIMARY(newchan)) { 977 if (prichan == NULL) { 978 /* Install the new primary channel */ 979 TAILQ_INSERT_TAIL(&sc->vmbus_prichans, newchan, 980 ch_prilink); 981 mtx_unlock(&sc->vmbus_prichan_lock); 982 return 0; 983 } else { 984 mtx_unlock(&sc->vmbus_prichan_lock); 985 device_printf(sc->vmbus_dev, "duplicated primary " 986 "chan%u\n", newchan->ch_id); 987 return EINVAL; 988 } 989 } else { /* Sub-channel */ 990 if (prichan == NULL) { 991 mtx_unlock(&sc->vmbus_prichan_lock); 992 device_printf(sc->vmbus_dev, "no primary chan for " 993 "chan%u\n", newchan->ch_id); 994 return EINVAL; 995 } 996 /* 997 * Found the primary channel for this sub-channel and 998 * move on. 999 * 1000 * XXX refcnt prichan 1001 */ 1002 } 1003 mtx_unlock(&sc->vmbus_prichan_lock); 1004 1005 /* 1006 * This is a sub-channel; link it with the primary channel. 1007 */ 1008 KASSERT(!VMBUS_CHAN_ISPRIMARY(newchan), 1009 ("new channel is not sub-channel")); 1010 KASSERT(prichan != NULL, ("no primary channel")); 1011 1012 newchan->ch_prichan = prichan; 1013 newchan->ch_dev = prichan->ch_dev; 1014 1015 mtx_lock(&prichan->ch_subchan_lock); 1016 TAILQ_INSERT_TAIL(&prichan->ch_subchans, newchan, ch_sublink); 1017 /* 1018 * Bump up sub-channel count and notify anyone that is 1019 * interested in this sub-channel, after this sub-channel 1020 * is setup. 1021 */ 1022 prichan->ch_subchan_cnt++; 1023 mtx_unlock(&prichan->ch_subchan_lock); 1024 wakeup(prichan); 1025 1026 return 0; 1027} 1028 1029void 1030vmbus_chan_cpu_set(struct vmbus_channel *chan, int cpu) 1031{ 1032 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpu %d", cpu)); 1033 1034 if (chan->ch_vmbus->vmbus_version == VMBUS_VERSION_WS2008 || 1035 chan->ch_vmbus->vmbus_version == VMBUS_VERSION_WIN7) { 1036 /* Only cpu0 is supported */ 1037 cpu = 0; 1038 } 1039 1040 chan->ch_cpuid = cpu; 1041 chan->ch_vcpuid = VMBUS_PCPU_GET(chan->ch_vmbus, vcpuid, cpu); 1042 1043 if (bootverbose) { 1044 printf("vmbus_chan%u: assigned to cpu%u [vcpu%u]\n", 1045 chan->ch_id, chan->ch_cpuid, chan->ch_vcpuid); 1046 } 1047} 1048 1049void 1050vmbus_chan_cpu_rr(struct vmbus_channel *chan) 1051{ 1052 static uint32_t vmbus_chan_nextcpu; 1053 int cpu; 1054 1055 cpu = atomic_fetchadd_int(&vmbus_chan_nextcpu, 1) % mp_ncpus; 1056 vmbus_chan_cpu_set(chan, cpu); 1057} 1058 1059static void 1060vmbus_chan_cpu_default(struct vmbus_channel *chan) 1061{ 1062 /* 1063 * By default, pin the channel to cpu0. Devices having 1064 * special channel-cpu mapping requirement should call 1065 * vmbus_chan_cpu_{set,rr}(). 1066 */ 1067 vmbus_chan_cpu_set(chan, 0); 1068} 1069 1070static void 1071vmbus_chan_msgproc_choffer(struct vmbus_softc *sc, 1072 const struct vmbus_message *msg) 1073{ 1074 const struct vmbus_chanmsg_choffer *offer; 1075 struct vmbus_channel *chan; 1076 int error; 1077 1078 offer = (const struct vmbus_chanmsg_choffer *)msg->msg_data; 1079 1080 chan = vmbus_chan_alloc(sc); 1081 if (chan == NULL) { 1082 device_printf(sc->vmbus_dev, "allocate chan%u failed\n", 1083 offer->chm_chanid); 1084 return; 1085 } 1086 1087 chan->ch_id = offer->chm_chanid; 1088 chan->ch_subidx = offer->chm_subidx; 1089 chan->ch_guid_type = offer->chm_chtype; 1090 chan->ch_guid_inst = offer->chm_chinst; 1091 1092 /* Batch reading is on by default */ 1093 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD; 1094 1095 chan->ch_monprm->mp_connid = VMBUS_CONNID_EVENT; 1096 if (sc->vmbus_version != VMBUS_VERSION_WS2008) 1097 chan->ch_monprm->mp_connid = offer->chm_connid; 1098 1099 if (offer->chm_flags1 & VMBUS_CHOFFER_FLAG1_HASMNF) { 1100 int trig_idx; 1101 1102 /* 1103 * Setup MNF stuffs. 1104 */ 1105 chan->ch_txflags |= VMBUS_CHAN_TXF_HASMNF; 1106 1107 trig_idx = offer->chm_montrig / VMBUS_MONTRIG_LEN; 1108 if (trig_idx >= VMBUS_MONTRIGS_MAX) 1109 panic("invalid monitor trigger %u", offer->chm_montrig); 1110 chan->ch_montrig = 1111 &sc->vmbus_mnf2->mnf_trigs[trig_idx].mt_pending; 1112 1113 chan->ch_montrig_mask = 1114 1 << (offer->chm_montrig % VMBUS_MONTRIG_LEN); 1115 } 1116 1117 /* 1118 * Setup event flag. 1119 */ 1120 chan->ch_evtflag = 1121 &sc->vmbus_tx_evtflags[chan->ch_id >> VMBUS_EVTFLAG_SHIFT]; 1122 chan->ch_evtflag_mask = 1UL << (chan->ch_id & VMBUS_EVTFLAG_MASK); 1123 1124 /* Select default cpu for this channel. */ 1125 vmbus_chan_cpu_default(chan); 1126 1127 error = vmbus_chan_add(chan); 1128 if (error) { 1129 device_printf(sc->vmbus_dev, "add chan%u failed: %d\n", 1130 chan->ch_id, error); 1131 vmbus_chan_free(chan); 1132 return; 1133 } 1134 1135 if (VMBUS_CHAN_ISPRIMARY(chan)) { 1136 /* 1137 * Add device for this primary channel. 1138 * 1139 * NOTE: 1140 * Error is ignored here; don't have much to do if error 1141 * really happens. 1142 */ 1143 vmbus_add_child(chan); 1144 } 1145} 1146 1147/* 1148 * XXX pretty broken; need rework. 1149 */ 1150static void 1151vmbus_chan_msgproc_chrescind(struct vmbus_softc *sc, 1152 const struct vmbus_message *msg) 1153{ 1154 const struct vmbus_chanmsg_chrescind *note; 1155 struct vmbus_channel *chan; 1156 1157 note = (const struct vmbus_chanmsg_chrescind *)msg->msg_data; 1158 if (note->chm_chanid > VMBUS_CHAN_MAX) { 1159 device_printf(sc->vmbus_dev, "invalid rescinded chan%u\n", 1160 note->chm_chanid); 1161 return; 1162 } 1163 1164 if (bootverbose) { 1165 device_printf(sc->vmbus_dev, "chan%u rescinded\n", 1166 note->chm_chanid); 1167 } 1168 1169 chan = sc->vmbus_chmap[note->chm_chanid]; 1170 if (chan == NULL) 1171 return; 1172 sc->vmbus_chmap[note->chm_chanid] = NULL; 1173 1174 taskqueue_enqueue(taskqueue_thread, &chan->ch_detach_task); 1175} 1176 1177static void 1178vmbus_chan_detach_task(void *xchan, int pending __unused) 1179{ 1180 struct vmbus_channel *chan = xchan; 1181 1182 if (VMBUS_CHAN_ISPRIMARY(chan)) { 1183 /* Only primary channel owns the device */ 1184 vmbus_delete_child(chan); 1185 /* NOTE: DO NOT free primary channel for now */ 1186 } else { 1187 struct vmbus_softc *sc = chan->ch_vmbus; 1188 struct vmbus_channel *pri_chan = chan->ch_prichan; 1189 struct vmbus_chanmsg_chfree *req; 1190 struct vmbus_msghc *mh; 1191 int error; 1192 1193 mh = vmbus_msghc_get(sc, sizeof(*req)); 1194 if (mh == NULL) { 1195 device_printf(sc->vmbus_dev, 1196 "can not get msg hypercall for chfree(chan%u)\n", 1197 chan->ch_id); 1198 goto remove; 1199 } 1200 1201 req = vmbus_msghc_dataptr(mh); 1202 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHFREE; 1203 req->chm_chanid = chan->ch_id; 1204 1205 error = vmbus_msghc_exec_noresult(mh); 1206 vmbus_msghc_put(sc, mh); 1207 1208 if (error) { 1209 device_printf(sc->vmbus_dev, 1210 "chfree(chan%u) failed: %d", 1211 chan->ch_id, error); 1212 /* NOTE: Move on! */ 1213 } else { 1214 if (bootverbose) { 1215 device_printf(sc->vmbus_dev, "chan%u freed\n", 1216 chan->ch_id); 1217 } 1218 } 1219remove: 1220 mtx_lock(&pri_chan->ch_subchan_lock); 1221 TAILQ_REMOVE(&pri_chan->ch_subchans, chan, ch_sublink); 1222 KASSERT(pri_chan->ch_subchan_cnt > 0, 1223 ("invalid subchan_cnt %d", pri_chan->ch_subchan_cnt)); 1224 pri_chan->ch_subchan_cnt--; 1225 mtx_unlock(&pri_chan->ch_subchan_lock); 1226 wakeup(pri_chan); 1227 1228 vmbus_chan_free(chan); 1229 } 1230} 1231 1232/* 1233 * Detach all devices and destroy the corresponding primary channels. 1234 */ 1235void 1236vmbus_chan_destroy_all(struct vmbus_softc *sc) 1237{ 1238 struct vmbus_channel *chan; 1239 1240 mtx_lock(&sc->vmbus_prichan_lock); 1241 while ((chan = TAILQ_FIRST(&sc->vmbus_prichans)) != NULL) { 1242 KASSERT(VMBUS_CHAN_ISPRIMARY(chan), ("not primary channel")); 1243 TAILQ_REMOVE(&sc->vmbus_prichans, chan, ch_prilink); 1244 mtx_unlock(&sc->vmbus_prichan_lock); 1245 1246 vmbus_delete_child(chan); 1247 vmbus_chan_free(chan); 1248 1249 mtx_lock(&sc->vmbus_prichan_lock); 1250 } 1251 bzero(sc->vmbus_chmap, 1252 sizeof(struct vmbus_channel *) * VMBUS_CHAN_MAX); 1253 mtx_unlock(&sc->vmbus_prichan_lock); 1254} 1255 1256/* 1257 * The channel whose vcpu binding is closest to the currect vcpu will 1258 * be selected. 1259 * If no multi-channel, always select primary channel. 1260 */ 1261struct vmbus_channel * 1262vmbus_chan_cpu2chan(struct vmbus_channel *prichan, int cpu) 1263{ 1264 struct vmbus_channel *sel, *chan; 1265 uint32_t vcpu, sel_dist; 1266 1267 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpuid %d", cpu)); 1268 if (TAILQ_EMPTY(&prichan->ch_subchans)) 1269 return prichan; 1270 1271 vcpu = VMBUS_PCPU_GET(prichan->ch_vmbus, vcpuid, cpu); 1272 1273#define CHAN_VCPU_DIST(ch, vcpu) \ 1274 (((ch)->ch_vcpuid > (vcpu)) ? \ 1275 ((ch)->ch_vcpuid - (vcpu)) : ((vcpu) - (ch)->ch_vcpuid)) 1276 1277#define CHAN_SELECT(ch) \ 1278do { \ 1279 sel = ch; \ 1280 sel_dist = CHAN_VCPU_DIST(ch, vcpu); \ 1281} while (0) 1282 1283 CHAN_SELECT(prichan); 1284 1285 mtx_lock(&prichan->ch_subchan_lock); 1286 TAILQ_FOREACH(chan, &prichan->ch_subchans, ch_sublink) { 1287 uint32_t dist; 1288 1289 KASSERT(chan->ch_stflags & VMBUS_CHAN_ST_OPENED, 1290 ("chan%u is not opened", chan->ch_id)); 1291 1292 if (chan->ch_vcpuid == vcpu) { 1293 /* Exact match; done */ 1294 CHAN_SELECT(chan); 1295 break; 1296 } 1297 1298 dist = CHAN_VCPU_DIST(chan, vcpu); 1299 if (sel_dist <= dist) { 1300 /* Far or same distance; skip */ 1301 continue; 1302 } 1303 1304 /* Select the closer channel. */ 1305 CHAN_SELECT(chan); 1306 } 1307 mtx_unlock(&prichan->ch_subchan_lock); 1308 1309#undef CHAN_SELECT 1310#undef CHAN_VCPU_DIST 1311 1312 return sel; 1313} 1314 1315struct vmbus_channel ** 1316vmbus_subchan_get(struct vmbus_channel *pri_chan, int subchan_cnt) 1317{ 1318 struct vmbus_channel **ret, *chan; 1319 int i; 1320 1321 ret = malloc(subchan_cnt * sizeof(struct vmbus_channel *), M_TEMP, 1322 M_WAITOK); 1323 1324 mtx_lock(&pri_chan->ch_subchan_lock); 1325 1326 while (pri_chan->ch_subchan_cnt < subchan_cnt) 1327 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "subch", 0); 1328 1329 i = 0; 1330 TAILQ_FOREACH(chan, &pri_chan->ch_subchans, ch_sublink) { 1331 /* TODO: refcnt chan */ 1332 ret[i] = chan; 1333 1334 ++i; 1335 if (i == subchan_cnt) 1336 break; 1337 } 1338 KASSERT(i == subchan_cnt, ("invalid subchan count %d, should be %d", 1339 pri_chan->ch_subchan_cnt, subchan_cnt)); 1340 1341 mtx_unlock(&pri_chan->ch_subchan_lock); 1342 1343 return ret; 1344} 1345 1346void 1347vmbus_subchan_rel(struct vmbus_channel **subchan, int subchan_cnt __unused) 1348{ 1349 1350 free(subchan, M_TEMP); 1351} 1352 1353void 1354vmbus_subchan_drain(struct vmbus_channel *pri_chan) 1355{ 1356 mtx_lock(&pri_chan->ch_subchan_lock); 1357 while (pri_chan->ch_subchan_cnt > 0) 1358 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "dsubch", 0); 1359 mtx_unlock(&pri_chan->ch_subchan_lock); 1360} 1361 1362void 1363vmbus_chan_msgproc(struct vmbus_softc *sc, const struct vmbus_message *msg) 1364{ 1365 vmbus_chanmsg_proc_t msg_proc; 1366 uint32_t msg_type; 1367 1368 msg_type = ((const struct vmbus_chanmsg_hdr *)msg->msg_data)->chm_type; 1369 KASSERT(msg_type < VMBUS_CHANMSG_TYPE_MAX, 1370 ("invalid message type %u", msg_type)); 1371 1372 msg_proc = vmbus_chan_msgprocs[msg_type]; 1373 if (msg_proc != NULL) 1374 msg_proc(sc, msg); 1375} 1376 1377void 1378vmbus_chan_set_readbatch(struct vmbus_channel *chan, bool on) 1379{ 1380 if (!on) 1381 chan->ch_flags &= ~VMBUS_CHAN_FLAG_BATCHREAD; 1382 else 1383 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD; 1384} 1385 1386uint32_t 1387vmbus_chan_id(const struct vmbus_channel *chan) 1388{ 1389 return chan->ch_id; 1390} 1391 1392uint32_t 1393vmbus_chan_subidx(const struct vmbus_channel *chan) 1394{ 1395 return chan->ch_subidx; 1396} 1397 1398bool 1399vmbus_chan_is_primary(const struct vmbus_channel *chan) 1400{ 1401 if (VMBUS_CHAN_ISPRIMARY(chan)) 1402 return true; 1403 else 1404 return false; 1405} 1406 1407const struct hyperv_guid * 1408vmbus_chan_guid_inst(const struct vmbus_channel *chan) 1409{ 1410 return &chan->ch_guid_inst; 1411} 1412