vmbus_chan.c revision 302892
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: head/sys/dev/hyperv/vmbus/hv_channel.c 302892 2016-07-15 08:40:22Z 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_send_event(hv_vmbus_channel* channel); 55static void vmbus_chan_update_evtflagcnt(struct vmbus_softc *, 56 const struct hv_vmbus_channel *); 57 58static void vmbus_chan_task(void *, int); 59static void vmbus_chan_task_nobatch(void *, int); 60static void vmbus_chan_detach_task(void *, int); 61 62static void vmbus_chan_msgproc_choffer(struct vmbus_softc *, 63 const struct vmbus_message *); 64static void vmbus_chan_msgproc_chrescind(struct vmbus_softc *, 65 const struct vmbus_message *); 66 67/* 68 * Vmbus channel message processing. 69 */ 70static const vmbus_chanmsg_proc_t 71vmbus_chan_msgprocs[VMBUS_CHANMSG_TYPE_MAX] = { 72 VMBUS_CHANMSG_PROC(CHOFFER, vmbus_chan_msgproc_choffer), 73 VMBUS_CHANMSG_PROC(CHRESCIND, vmbus_chan_msgproc_chrescind), 74 75 VMBUS_CHANMSG_PROC_WAKEUP(CHOPEN_RESP), 76 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_CONNRESP), 77 VMBUS_CHANMSG_PROC_WAKEUP(GPADL_DISCONNRESP) 78}; 79 80/** 81 * @brief Trigger an event notification on the specified channel 82 */ 83static void 84vmbus_chan_send_event(hv_vmbus_channel *channel) 85{ 86 struct vmbus_softc *sc = channel->vmbus_sc; 87 uint32_t chanid = channel->ch_id; 88 89 atomic_set_long(&sc->vmbus_tx_evtflags[chanid >> VMBUS_EVTFLAG_SHIFT], 90 1UL << (chanid & VMBUS_EVTFLAG_MASK)); 91 92 if (channel->ch_flags & VMBUS_CHAN_FLAG_HASMNF) { 93 atomic_set_int( 94 &sc->vmbus_mnf2->mnf_trigs[channel->ch_montrig_idx].mt_pending, 95 channel->ch_montrig_mask); 96 } else { 97 hypercall_signal_event(channel->ch_monprm_dma.hv_paddr); 98 } 99} 100 101static int 102vmbus_chan_sysctl_mnf(SYSCTL_HANDLER_ARGS) 103{ 104 struct hv_vmbus_channel *chan = arg1; 105 int mnf = 0; 106 107 if (chan->ch_flags & VMBUS_CHAN_FLAG_HASMNF) 108 mnf = 1; 109 return sysctl_handle_int(oidp, &mnf, 0, req); 110} 111 112static void 113vmbus_chan_sysctl_create(struct hv_vmbus_channel *chan) 114{ 115 struct sysctl_oid *ch_tree, *chid_tree, *br_tree; 116 struct sysctl_ctx_list *ctx; 117 uint32_t ch_id; 118 char name[16]; 119 120 /* 121 * Add sysctl nodes related to this channel to this 122 * channel's sysctl ctx, so that they can be destroyed 123 * independently upon close of this channel, which can 124 * happen even if the device is not detached. 125 */ 126 ctx = &chan->ch_sysctl_ctx; 127 sysctl_ctx_init(ctx); 128 129 /* 130 * Create dev.NAME.UNIT.channel tree. 131 */ 132 ch_tree = SYSCTL_ADD_NODE(ctx, 133 SYSCTL_CHILDREN(device_get_sysctl_tree(chan->ch_dev)), 134 OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 135 if (ch_tree == NULL) 136 return; 137 138 /* 139 * Create dev.NAME.UNIT.channel.CHANID tree. 140 */ 141 if (VMBUS_CHAN_ISPRIMARY(chan)) 142 ch_id = chan->ch_id; 143 else 144 ch_id = chan->ch_prichan->ch_id; 145 snprintf(name, sizeof(name), "%d", ch_id); 146 chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree), 147 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 148 if (chid_tree == NULL) 149 return; 150 151 if (!VMBUS_CHAN_ISPRIMARY(chan)) { 152 /* 153 * Create dev.NAME.UNIT.channel.CHANID.sub tree. 154 */ 155 ch_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), 156 OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 157 if (ch_tree == NULL) 158 return; 159 160 /* 161 * Create dev.NAME.UNIT.channel.CHANID.sub.SUBIDX tree. 162 * 163 * NOTE: 164 * chid_tree is changed to this new sysctl tree. 165 */ 166 snprintf(name, sizeof(name), "%d", chan->ch_subidx); 167 chid_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(ch_tree), 168 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 169 if (chid_tree == NULL) 170 return; 171 172 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 173 "chanid", CTLFLAG_RD, &chan->ch_id, 0, "channel id"); 174 } 175 176 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 177 "cpu", CTLFLAG_RD, &chan->ch_cpuid, 0, "owner CPU id"); 178 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 179 "mnf", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 180 chan, 0, vmbus_chan_sysctl_mnf, "I", 181 "has monitor notification facilities"); 182 183 /* 184 * Create sysctl tree for RX bufring. 185 */ 186 br_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 187 "in", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 188 if (br_tree != NULL) { 189 hv_ring_buffer_stat(ctx, SYSCTL_CHILDREN(br_tree), 190 &chan->inbound, "inbound ring buffer stats"); 191 } 192 193 /* 194 * Create sysctl tree for TX bufring. 195 */ 196 br_tree = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(chid_tree), OID_AUTO, 197 "out", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 198 if (br_tree != NULL) { 199 hv_ring_buffer_stat(ctx, SYSCTL_CHILDREN(br_tree), 200 &chan->outbound, "outbound ring buffer stats"); 201 } 202} 203 204/** 205 * @brief Open the specified channel 206 */ 207int 208hv_vmbus_channel_open( 209 hv_vmbus_channel* new_channel, 210 uint32_t send_ring_buffer_size, 211 uint32_t recv_ring_buffer_size, 212 void* user_data, 213 uint32_t user_data_len, 214 vmbus_chan_callback_t cb, 215 void *cbarg) 216{ 217 struct vmbus_softc *sc = new_channel->vmbus_sc; 218 const struct vmbus_chanmsg_chopen_resp *resp; 219 const struct vmbus_message *msg; 220 struct vmbus_chanmsg_chopen *req; 221 struct vmbus_msghc *mh; 222 uint32_t status; 223 int ret = 0; 224 uint8_t *br; 225 226 if (user_data_len > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) { 227 device_printf(sc->vmbus_dev, 228 "invalid udata len %u for chan%u\n", 229 user_data_len, new_channel->ch_id); 230 return EINVAL; 231 } 232 KASSERT((send_ring_buffer_size & PAGE_MASK) == 0, 233 ("send bufring size is not multiple page")); 234 KASSERT((recv_ring_buffer_size & PAGE_MASK) == 0, 235 ("recv bufring size is not multiple page")); 236 237 if (atomic_testandset_int(&new_channel->ch_stflags, 238 VMBUS_CHAN_ST_OPENED_SHIFT)) 239 panic("double-open chan%u", new_channel->ch_id); 240 241 new_channel->ch_cb = cb; 242 new_channel->ch_cbarg = cbarg; 243 244 vmbus_chan_update_evtflagcnt(sc, new_channel); 245 246 new_channel->ch_tq = VMBUS_PCPU_GET(new_channel->vmbus_sc, event_tq, 247 new_channel->ch_cpuid); 248 if (new_channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) { 249 TASK_INIT(&new_channel->ch_task, 0, vmbus_chan_task, 250 new_channel); 251 } else { 252 TASK_INIT(&new_channel->ch_task, 0, vmbus_chan_task_nobatch, 253 new_channel); 254 } 255 256 /* 257 * Allocate the TX+RX bufrings. 258 * XXX should use ch_dev dtag 259 */ 260 br = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev), 261 PAGE_SIZE, 0, send_ring_buffer_size + recv_ring_buffer_size, 262 &new_channel->ch_bufring_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); 263 if (br == NULL) { 264 device_printf(sc->vmbus_dev, "bufring allocation failed\n"); 265 ret = ENOMEM; 266 goto failed; 267 } 268 new_channel->ch_bufring = br; 269 270 /* TX bufring comes first */ 271 hv_vmbus_ring_buffer_init(&new_channel->outbound, 272 br, send_ring_buffer_size); 273 /* RX bufring immediately follows TX bufring */ 274 hv_vmbus_ring_buffer_init(&new_channel->inbound, 275 br + send_ring_buffer_size, recv_ring_buffer_size); 276 277 /* Create sysctl tree for this channel */ 278 vmbus_chan_sysctl_create(new_channel); 279 280 /* 281 * Connect the bufrings, both RX and TX, to this channel. 282 */ 283 ret = vmbus_chan_gpadl_connect(new_channel, 284 new_channel->ch_bufring_dma.hv_paddr, 285 send_ring_buffer_size + recv_ring_buffer_size, 286 &new_channel->ch_bufring_gpadl); 287 if (ret != 0) { 288 device_printf(sc->vmbus_dev, 289 "failed to connect bufring GPADL to chan%u\n", 290 new_channel->ch_id); 291 goto failed; 292 } 293 294 /* 295 * Open channel w/ the bufring GPADL on the target CPU. 296 */ 297 mh = vmbus_msghc_get(sc, sizeof(*req)); 298 if (mh == NULL) { 299 device_printf(sc->vmbus_dev, 300 "can not get msg hypercall for chopen(chan%u)\n", 301 new_channel->ch_id); 302 ret = ENXIO; 303 goto failed; 304 } 305 306 req = vmbus_msghc_dataptr(mh); 307 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN; 308 req->chm_chanid = new_channel->ch_id; 309 req->chm_openid = new_channel->ch_id; 310 req->chm_gpadl = new_channel->ch_bufring_gpadl; 311 req->chm_vcpuid = new_channel->ch_vcpuid; 312 req->chm_rxbr_pgofs = send_ring_buffer_size >> PAGE_SHIFT; 313 if (user_data_len) 314 memcpy(req->chm_udata, user_data, user_data_len); 315 316 ret = vmbus_msghc_exec(sc, mh); 317 if (ret != 0) { 318 device_printf(sc->vmbus_dev, 319 "chopen(chan%u) msg hypercall exec failed: %d\n", 320 new_channel->ch_id, ret); 321 vmbus_msghc_put(sc, mh); 322 goto failed; 323 } 324 325 msg = vmbus_msghc_wait_result(sc, mh); 326 resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data; 327 status = resp->chm_status; 328 329 vmbus_msghc_put(sc, mh); 330 331 if (status == 0) { 332 if (bootverbose) { 333 device_printf(sc->vmbus_dev, "chan%u opened\n", 334 new_channel->ch_id); 335 } 336 return 0; 337 } 338 339 device_printf(sc->vmbus_dev, "failed to open chan%u\n", 340 new_channel->ch_id); 341 ret = ENXIO; 342 343failed: 344 if (new_channel->ch_bufring_gpadl) { 345 vmbus_chan_gpadl_disconnect(new_channel, 346 new_channel->ch_bufring_gpadl); 347 new_channel->ch_bufring_gpadl = 0; 348 } 349 if (new_channel->ch_bufring != NULL) { 350 hyperv_dmamem_free(&new_channel->ch_bufring_dma, 351 new_channel->ch_bufring); 352 new_channel->ch_bufring = NULL; 353 } 354 atomic_clear_int(&new_channel->ch_stflags, VMBUS_CHAN_ST_OPENED); 355 return ret; 356} 357 358int 359vmbus_chan_gpadl_connect(struct hv_vmbus_channel *chan, bus_addr_t paddr, 360 int size, uint32_t *gpadl0) 361{ 362 struct vmbus_softc *sc = chan->vmbus_sc; 363 struct vmbus_msghc *mh; 364 struct vmbus_chanmsg_gpadl_conn *req; 365 const struct vmbus_message *msg; 366 size_t reqsz; 367 uint32_t gpadl, status; 368 int page_count, range_len, i, cnt, error; 369 uint64_t page_id; 370 371 /* 372 * Preliminary checks. 373 */ 374 375 KASSERT((size & PAGE_MASK) == 0, 376 ("invalid GPA size %d, not multiple page size", size)); 377 page_count = size >> PAGE_SHIFT; 378 379 KASSERT((paddr & PAGE_MASK) == 0, 380 ("GPA is not page aligned %jx", (uintmax_t)paddr)); 381 page_id = paddr >> PAGE_SHIFT; 382 383 range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); 384 /* 385 * We don't support multiple GPA ranges. 386 */ 387 if (range_len > UINT16_MAX) { 388 device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", 389 page_count); 390 return EOPNOTSUPP; 391 } 392 393 /* 394 * Allocate GPADL id. 395 */ 396 gpadl = vmbus_gpadl_alloc(sc); 397 *gpadl0 = gpadl; 398 399 /* 400 * Connect this GPADL to the target channel. 401 * 402 * NOTE: 403 * Since each message can only hold small set of page 404 * addresses, several messages may be required to 405 * complete the connection. 406 */ 407 if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) 408 cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; 409 else 410 cnt = page_count; 411 page_count -= cnt; 412 413 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, 414 chm_range.gpa_page[cnt]); 415 mh = vmbus_msghc_get(sc, reqsz); 416 if (mh == NULL) { 417 device_printf(sc->vmbus_dev, 418 "can not get msg hypercall for gpadl->chan%u\n", 419 chan->ch_id); 420 return EIO; 421 } 422 423 req = vmbus_msghc_dataptr(mh); 424 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN; 425 req->chm_chanid = chan->ch_id; 426 req->chm_gpadl = gpadl; 427 req->chm_range_len = range_len; 428 req->chm_range_cnt = 1; 429 req->chm_range.gpa_len = size; 430 req->chm_range.gpa_ofs = 0; 431 for (i = 0; i < cnt; ++i) 432 req->chm_range.gpa_page[i] = page_id++; 433 434 error = vmbus_msghc_exec(sc, mh); 435 if (error) { 436 device_printf(sc->vmbus_dev, 437 "gpadl->chan%u msg hypercall exec failed: %d\n", 438 chan->ch_id, error); 439 vmbus_msghc_put(sc, mh); 440 return error; 441 } 442 443 while (page_count > 0) { 444 struct vmbus_chanmsg_gpadl_subconn *subreq; 445 446 if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) 447 cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; 448 else 449 cnt = page_count; 450 page_count -= cnt; 451 452 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, 453 chm_gpa_page[cnt]); 454 vmbus_msghc_reset(mh, reqsz); 455 456 subreq = vmbus_msghc_dataptr(mh); 457 subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN; 458 subreq->chm_gpadl = gpadl; 459 for (i = 0; i < cnt; ++i) 460 subreq->chm_gpa_page[i] = page_id++; 461 462 vmbus_msghc_exec_noresult(mh); 463 } 464 KASSERT(page_count == 0, ("invalid page count %d", page_count)); 465 466 msg = vmbus_msghc_wait_result(sc, mh); 467 status = ((const struct vmbus_chanmsg_gpadl_connresp *) 468 msg->msg_data)->chm_status; 469 470 vmbus_msghc_put(sc, mh); 471 472 if (status != 0) { 473 device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " 474 "status %u\n", chan->ch_id, status); 475 return EIO; 476 } else { 477 if (bootverbose) { 478 device_printf(sc->vmbus_dev, "gpadl->chan%u " 479 "succeeded\n", chan->ch_id); 480 } 481 } 482 return 0; 483} 484 485/* 486 * Disconnect the GPA from the target channel 487 */ 488int 489vmbus_chan_gpadl_disconnect(struct hv_vmbus_channel *chan, uint32_t gpadl) 490{ 491 struct vmbus_softc *sc = chan->vmbus_sc; 492 struct vmbus_msghc *mh; 493 struct vmbus_chanmsg_gpadl_disconn *req; 494 int error; 495 496 mh = vmbus_msghc_get(sc, sizeof(*req)); 497 if (mh == NULL) { 498 device_printf(sc->vmbus_dev, 499 "can not get msg hypercall for gpa x->chan%u\n", 500 chan->ch_id); 501 return EBUSY; 502 } 503 504 req = vmbus_msghc_dataptr(mh); 505 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN; 506 req->chm_chanid = chan->ch_id; 507 req->chm_gpadl = gpadl; 508 509 error = vmbus_msghc_exec(sc, mh); 510 if (error) { 511 device_printf(sc->vmbus_dev, 512 "gpa x->chan%u msg hypercall exec failed: %d\n", 513 chan->ch_id, error); 514 vmbus_msghc_put(sc, mh); 515 return error; 516 } 517 518 vmbus_msghc_wait_result(sc, mh); 519 /* Discard result; no useful information */ 520 vmbus_msghc_put(sc, mh); 521 522 return 0; 523} 524 525static void 526vmbus_chan_close_internal(struct hv_vmbus_channel *chan) 527{ 528 struct vmbus_softc *sc = chan->vmbus_sc; 529 struct vmbus_msghc *mh; 530 struct vmbus_chanmsg_chclose *req; 531 struct taskqueue *tq = chan->ch_tq; 532 int error; 533 534 /* TODO: stringent check */ 535 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED); 536 537 /* 538 * Free this channel's sysctl tree attached to its device's 539 * sysctl tree. 540 */ 541 sysctl_ctx_free(&chan->ch_sysctl_ctx); 542 543 /* 544 * Set ch_tq to NULL to avoid more requests be scheduled. 545 * XXX pretty broken; need rework. 546 */ 547 chan->ch_tq = NULL; 548 taskqueue_drain(tq, &chan->ch_task); 549 chan->ch_cb = NULL; 550 551 /* 552 * Close this channel. 553 */ 554 mh = vmbus_msghc_get(sc, sizeof(*req)); 555 if (mh == NULL) { 556 device_printf(sc->vmbus_dev, 557 "can not get msg hypercall for chclose(chan%u)\n", 558 chan->ch_id); 559 return; 560 } 561 562 req = vmbus_msghc_dataptr(mh); 563 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; 564 req->chm_chanid = chan->ch_id; 565 566 error = vmbus_msghc_exec_noresult(mh); 567 vmbus_msghc_put(sc, mh); 568 569 if (error) { 570 device_printf(sc->vmbus_dev, 571 "chclose(chan%u) msg hypercall exec failed: %d\n", 572 chan->ch_id, error); 573 return; 574 } else if (bootverbose) { 575 device_printf(sc->vmbus_dev, "close chan%u\n", chan->ch_id); 576 } 577 578 /* 579 * Disconnect the TX+RX bufrings from this channel. 580 */ 581 if (chan->ch_bufring_gpadl) { 582 vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl); 583 chan->ch_bufring_gpadl = 0; 584 } 585 586 /* 587 * Destroy the TX+RX bufrings. 588 */ 589 hv_ring_buffer_cleanup(&chan->outbound); 590 hv_ring_buffer_cleanup(&chan->inbound); 591 if (chan->ch_bufring != NULL) { 592 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring); 593 chan->ch_bufring = NULL; 594 } 595} 596 597/* 598 * Caller should make sure that all sub-channels have 599 * been added to 'chan' and all to-be-closed channels 600 * are not being opened. 601 */ 602void 603hv_vmbus_channel_close(struct hv_vmbus_channel *chan) 604{ 605 int subchan_cnt; 606 607 if (!VMBUS_CHAN_ISPRIMARY(chan)) { 608 /* 609 * Sub-channel is closed when its primary channel 610 * is closed; done. 611 */ 612 return; 613 } 614 615 /* 616 * Close all sub-channels, if any. 617 */ 618 subchan_cnt = chan->ch_subchan_cnt; 619 if (subchan_cnt > 0) { 620 struct hv_vmbus_channel **subchan; 621 int i; 622 623 subchan = vmbus_subchan_get(chan, subchan_cnt); 624 for (i = 0; i < subchan_cnt; ++i) 625 vmbus_chan_close_internal(subchan[i]); 626 vmbus_subchan_rel(subchan, subchan_cnt); 627 } 628 629 /* Then close the primary channel. */ 630 vmbus_chan_close_internal(chan); 631} 632 633int 634vmbus_chan_send(struct hv_vmbus_channel *chan, uint16_t type, uint16_t flags, 635 void *data, int dlen, uint64_t xactid) 636{ 637 struct vmbus_chanpkt pkt; 638 int pktlen, pad_pktlen, hlen, error; 639 uint64_t pad = 0; 640 struct iovec iov[3]; 641 boolean_t send_evt; 642 643 hlen = sizeof(pkt); 644 pktlen = hlen + dlen; 645 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 646 647 pkt.cp_hdr.cph_type = type; 648 pkt.cp_hdr.cph_flags = flags; 649 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 650 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 651 pkt.cp_hdr.cph_xactid = xactid; 652 653 iov[0].iov_base = &pkt; 654 iov[0].iov_len = hlen; 655 iov[1].iov_base = data; 656 iov[1].iov_len = dlen; 657 iov[2].iov_base = &pad; 658 iov[2].iov_len = pad_pktlen - pktlen; 659 660 error = hv_ring_buffer_write(&chan->outbound, iov, 3, &send_evt); 661 if (!error && send_evt) 662 vmbus_chan_send_event(chan); 663 return error; 664} 665 666int 667vmbus_chan_send_sglist(struct hv_vmbus_channel *chan, 668 struct vmbus_gpa sg[], int sglen, void *data, int dlen, uint64_t xactid) 669{ 670 struct vmbus_chanpkt_sglist pkt; 671 int pktlen, pad_pktlen, hlen, error; 672 struct iovec iov[4]; 673 boolean_t send_evt; 674 uint64_t pad = 0; 675 676 KASSERT(sglen < VMBUS_CHAN_SGLIST_MAX, 677 ("invalid sglist len %d", sglen)); 678 679 hlen = __offsetof(struct vmbus_chanpkt_sglist, cp_gpa[sglen]); 680 pktlen = hlen + dlen; 681 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 682 683 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; 684 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; 685 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 686 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 687 pkt.cp_hdr.cph_xactid = xactid; 688 pkt.cp_rsvd = 0; 689 pkt.cp_gpa_cnt = sglen; 690 691 iov[0].iov_base = &pkt; 692 iov[0].iov_len = sizeof(pkt); 693 iov[1].iov_base = sg; 694 iov[1].iov_len = sizeof(struct vmbus_gpa) * sglen; 695 iov[2].iov_base = data; 696 iov[2].iov_len = dlen; 697 iov[3].iov_base = &pad; 698 iov[3].iov_len = pad_pktlen - pktlen; 699 700 error = hv_ring_buffer_write(&chan->outbound, iov, 4, &send_evt); 701 if (!error && send_evt) 702 vmbus_chan_send_event(chan); 703 return error; 704} 705 706int 707vmbus_chan_send_prplist(struct hv_vmbus_channel *chan, 708 struct vmbus_gpa_range *prp, int prp_cnt, void *data, int dlen, 709 uint64_t xactid) 710{ 711 struct vmbus_chanpkt_prplist pkt; 712 int pktlen, pad_pktlen, hlen, error; 713 struct iovec iov[4]; 714 boolean_t send_evt; 715 uint64_t pad = 0; 716 717 KASSERT(prp_cnt < VMBUS_CHAN_PRPLIST_MAX, 718 ("invalid prplist entry count %d", prp_cnt)); 719 720 hlen = __offsetof(struct vmbus_chanpkt_prplist, 721 cp_range[0].gpa_page[prp_cnt]); 722 pktlen = hlen + dlen; 723 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 724 725 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; 726 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; 727 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 728 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 729 pkt.cp_hdr.cph_xactid = xactid; 730 pkt.cp_rsvd = 0; 731 pkt.cp_range_cnt = 1; 732 733 iov[0].iov_base = &pkt; 734 iov[0].iov_len = sizeof(pkt); 735 iov[1].iov_base = prp; 736 iov[1].iov_len = __offsetof(struct vmbus_gpa_range, gpa_page[prp_cnt]); 737 iov[2].iov_base = data; 738 iov[2].iov_len = dlen; 739 iov[3].iov_base = &pad; 740 iov[3].iov_len = pad_pktlen - pktlen; 741 742 error = hv_ring_buffer_write(&chan->outbound, iov, 4, &send_evt); 743 if (!error && send_evt) 744 vmbus_chan_send_event(chan); 745 return error; 746} 747 748int 749vmbus_chan_recv(struct hv_vmbus_channel *chan, void *data, int *dlen0, 750 uint64_t *xactid) 751{ 752 struct vmbus_chanpkt_hdr pkt; 753 int error, dlen, hlen; 754 755 error = hv_ring_buffer_peek(&chan->inbound, &pkt, sizeof(pkt)); 756 if (error) 757 return error; 758 759 hlen = VMBUS_CHANPKT_GETLEN(pkt.cph_hlen); 760 dlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen) - hlen; 761 762 if (*dlen0 < dlen) { 763 /* Return the size of this packet's data. */ 764 *dlen0 = dlen; 765 return ENOBUFS; 766 } 767 768 *xactid = pkt.cph_xactid; 769 *dlen0 = dlen; 770 771 /* Skip packet header */ 772 error = hv_ring_buffer_read(&chan->inbound, data, dlen, hlen); 773 KASSERT(!error, ("hv_ring_buffer_read failed")); 774 775 return 0; 776} 777 778int 779vmbus_chan_recv_pkt(struct hv_vmbus_channel *chan, 780 struct vmbus_chanpkt_hdr *pkt0, int *pktlen0) 781{ 782 struct vmbus_chanpkt_hdr pkt; 783 int error, pktlen; 784 785 error = hv_ring_buffer_peek(&chan->inbound, &pkt, sizeof(pkt)); 786 if (error) 787 return error; 788 789 pktlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen); 790 if (*pktlen0 < pktlen) { 791 /* Return the size of this packet. */ 792 *pktlen0 = pktlen; 793 return ENOBUFS; 794 } 795 *pktlen0 = pktlen; 796 797 /* Include packet header */ 798 error = hv_ring_buffer_read(&chan->inbound, pkt0, pktlen, 0); 799 KASSERT(!error, ("hv_ring_buffer_read failed")); 800 801 return 0; 802} 803 804static void 805vmbus_chan_task(void *xchan, int pending __unused) 806{ 807 struct hv_vmbus_channel *chan = xchan; 808 vmbus_chan_callback_t cb = chan->ch_cb; 809 void *cbarg = chan->ch_cbarg; 810 811 /* 812 * Optimize host to guest signaling by ensuring: 813 * 1. While reading the channel, we disable interrupts from 814 * host. 815 * 2. Ensure that we process all posted messages from the host 816 * before returning from this callback. 817 * 3. Once we return, enable signaling from the host. Once this 818 * state is set we check to see if additional packets are 819 * available to read. In this case we repeat the process. 820 * 821 * NOTE: Interrupt has been disabled in the ISR. 822 */ 823 for (;;) { 824 uint32_t left; 825 826 cb(cbarg); 827 828 left = hv_ring_buffer_read_end(&chan->inbound); 829 if (left == 0) { 830 /* No more data in RX bufring; done */ 831 break; 832 } 833 hv_ring_buffer_read_begin(&chan->inbound); 834 } 835} 836 837static void 838vmbus_chan_task_nobatch(void *xchan, int pending __unused) 839{ 840 struct hv_vmbus_channel *chan = xchan; 841 842 chan->ch_cb(chan->ch_cbarg); 843} 844 845static __inline void 846vmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags, 847 int flag_cnt) 848{ 849 int f; 850 851 for (f = 0; f < flag_cnt; ++f) { 852 uint32_t chid_base; 853 u_long flags; 854 int chid_ofs; 855 856 if (event_flags[f] == 0) 857 continue; 858 859 flags = atomic_swap_long(&event_flags[f], 0); 860 chid_base = f << VMBUS_EVTFLAG_SHIFT; 861 862 while ((chid_ofs = ffsl(flags)) != 0) { 863 struct hv_vmbus_channel *channel; 864 865 --chid_ofs; /* NOTE: ffsl is 1-based */ 866 flags &= ~(1UL << chid_ofs); 867 868 channel = sc->vmbus_chmap[chid_base + chid_ofs]; 869 870 /* if channel is closed or closing */ 871 if (channel == NULL || channel->ch_tq == NULL) 872 continue; 873 874 if (channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) 875 hv_ring_buffer_read_begin(&channel->inbound); 876 taskqueue_enqueue(channel->ch_tq, &channel->ch_task); 877 } 878 } 879} 880 881void 882vmbus_event_proc(struct vmbus_softc *sc, int cpu) 883{ 884 struct vmbus_evtflags *eventf; 885 886 /* 887 * On Host with Win8 or above, the event page can be checked directly 888 * to get the id of the channel that has the pending interrupt. 889 */ 890 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 891 vmbus_event_flags_proc(sc, eventf->evt_flags, 892 VMBUS_PCPU_GET(sc, event_flags_cnt, cpu)); 893} 894 895void 896vmbus_event_proc_compat(struct vmbus_softc *sc, int cpu) 897{ 898 struct vmbus_evtflags *eventf; 899 900 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 901 if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) { 902 vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags, 903 VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT); 904 } 905} 906 907static void 908vmbus_chan_update_evtflagcnt(struct vmbus_softc *sc, 909 const struct hv_vmbus_channel *chan) 910{ 911 volatile int *flag_cnt_ptr; 912 int flag_cnt; 913 914 flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1; 915 flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->ch_cpuid); 916 917 for (;;) { 918 int old_flag_cnt; 919 920 old_flag_cnt = *flag_cnt_ptr; 921 if (old_flag_cnt >= flag_cnt) 922 break; 923 if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) { 924 if (bootverbose) { 925 device_printf(sc->vmbus_dev, 926 "channel%u update cpu%d flag_cnt to %d\n", 927 chan->ch_id, chan->ch_cpuid, flag_cnt); 928 } 929 break; 930 } 931 } 932} 933 934static struct hv_vmbus_channel * 935vmbus_chan_alloc(struct vmbus_softc *sc) 936{ 937 struct hv_vmbus_channel *chan; 938 939 chan = malloc(sizeof(*chan), M_DEVBUF, M_WAITOK | M_ZERO); 940 941 chan->ch_monprm = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev), 942 HYPERCALL_PARAM_ALIGN, 0, sizeof(struct hyperv_mon_param), 943 &chan->ch_monprm_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); 944 if (chan->ch_monprm == NULL) { 945 device_printf(sc->vmbus_dev, "monprm alloc failed\n"); 946 free(chan, M_DEVBUF); 947 return NULL; 948 } 949 950 chan->vmbus_sc = sc; 951 mtx_init(&chan->ch_subchan_lock, "vmbus subchan", NULL, MTX_DEF); 952 TAILQ_INIT(&chan->ch_subchans); 953 TASK_INIT(&chan->ch_detach_task, 0, vmbus_chan_detach_task, chan); 954 955 return chan; 956} 957 958static void 959vmbus_chan_free(struct hv_vmbus_channel *chan) 960{ 961 /* TODO: assert sub-channel list is empty */ 962 /* TODO: asset no longer on the primary channel's sub-channel list */ 963 /* TODO: asset no longer on the vmbus channel list */ 964 hyperv_dmamem_free(&chan->ch_monprm_dma, chan->ch_monprm); 965 mtx_destroy(&chan->ch_subchan_lock); 966 free(chan, M_DEVBUF); 967} 968 969static int 970vmbus_chan_add(struct hv_vmbus_channel *newchan) 971{ 972 struct vmbus_softc *sc = newchan->vmbus_sc; 973 struct hv_vmbus_channel *prichan; 974 975 if (newchan->ch_id == 0) { 976 /* 977 * XXX 978 * Chan0 will neither be processed nor should be offered; 979 * skip it. 980 */ 981 device_printf(sc->vmbus_dev, "got chan0 offer, discard\n"); 982 return EINVAL; 983 } else if (newchan->ch_id >= VMBUS_CHAN_MAX) { 984 device_printf(sc->vmbus_dev, "invalid chan%u offer\n", 985 newchan->ch_id); 986 return EINVAL; 987 } 988 sc->vmbus_chmap[newchan->ch_id] = newchan; 989 990 if (bootverbose) { 991 device_printf(sc->vmbus_dev, "chan%u subidx%u offer\n", 992 newchan->ch_id, newchan->ch_subidx); 993 } 994 995 mtx_lock(&sc->vmbus_prichan_lock); 996 TAILQ_FOREACH(prichan, &sc->vmbus_prichans, ch_prilink) { 997 /* 998 * Sub-channel will have the same type GUID and instance 999 * GUID as its primary channel. 1000 */ 1001 if (memcmp(&prichan->ch_guid_type, &newchan->ch_guid_type, 1002 sizeof(struct hyperv_guid)) == 0 && 1003 memcmp(&prichan->ch_guid_inst, &newchan->ch_guid_inst, 1004 sizeof(struct hyperv_guid)) == 0) 1005 break; 1006 } 1007 if (VMBUS_CHAN_ISPRIMARY(newchan)) { 1008 if (prichan == NULL) { 1009 /* Install the new primary channel */ 1010 TAILQ_INSERT_TAIL(&sc->vmbus_prichans, newchan, 1011 ch_prilink); 1012 mtx_unlock(&sc->vmbus_prichan_lock); 1013 return 0; 1014 } else { 1015 mtx_unlock(&sc->vmbus_prichan_lock); 1016 device_printf(sc->vmbus_dev, "duplicated primary " 1017 "chan%u\n", newchan->ch_id); 1018 return EINVAL; 1019 } 1020 } else { /* Sub-channel */ 1021 if (prichan == NULL) { 1022 mtx_unlock(&sc->vmbus_prichan_lock); 1023 device_printf(sc->vmbus_dev, "no primary chan for " 1024 "chan%u\n", newchan->ch_id); 1025 return EINVAL; 1026 } 1027 /* 1028 * Found the primary channel for this sub-channel and 1029 * move on. 1030 * 1031 * XXX refcnt prichan 1032 */ 1033 } 1034 mtx_unlock(&sc->vmbus_prichan_lock); 1035 1036 /* 1037 * This is a sub-channel; link it with the primary channel. 1038 */ 1039 KASSERT(!VMBUS_CHAN_ISPRIMARY(newchan), 1040 ("new channel is not sub-channel")); 1041 KASSERT(prichan != NULL, ("no primary channel")); 1042 1043 newchan->ch_prichan = prichan; 1044 newchan->ch_dev = prichan->ch_dev; 1045 1046 mtx_lock(&prichan->ch_subchan_lock); 1047 TAILQ_INSERT_TAIL(&prichan->ch_subchans, newchan, ch_sublink); 1048 /* 1049 * Bump up sub-channel count and notify anyone that is 1050 * interested in this sub-channel, after this sub-channel 1051 * is setup. 1052 */ 1053 prichan->ch_subchan_cnt++; 1054 mtx_unlock(&prichan->ch_subchan_lock); 1055 wakeup(prichan); 1056 1057 return 0; 1058} 1059 1060void 1061vmbus_chan_cpu_set(struct hv_vmbus_channel *chan, int cpu) 1062{ 1063 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpu %d", cpu)); 1064 1065 if (chan->vmbus_sc->vmbus_version == VMBUS_VERSION_WS2008 || 1066 chan->vmbus_sc->vmbus_version == VMBUS_VERSION_WIN7) { 1067 /* Only cpu0 is supported */ 1068 cpu = 0; 1069 } 1070 1071 chan->ch_cpuid = cpu; 1072 chan->ch_vcpuid = VMBUS_PCPU_GET(chan->vmbus_sc, vcpuid, cpu); 1073 1074 if (bootverbose) { 1075 printf("vmbus_chan%u: assigned to cpu%u [vcpu%u]\n", 1076 chan->ch_id, chan->ch_cpuid, chan->ch_vcpuid); 1077 } 1078} 1079 1080void 1081vmbus_chan_cpu_rr(struct hv_vmbus_channel *chan) 1082{ 1083 static uint32_t vmbus_chan_nextcpu; 1084 int cpu; 1085 1086 cpu = atomic_fetchadd_int(&vmbus_chan_nextcpu, 1) % mp_ncpus; 1087 vmbus_chan_cpu_set(chan, cpu); 1088} 1089 1090static void 1091vmbus_chan_cpu_default(struct hv_vmbus_channel *chan) 1092{ 1093 /* 1094 * By default, pin the channel to cpu0. Devices having 1095 * special channel-cpu mapping requirement should call 1096 * vmbus_chan_cpu_{set,rr}(). 1097 */ 1098 vmbus_chan_cpu_set(chan, 0); 1099} 1100 1101static void 1102vmbus_chan_msgproc_choffer(struct vmbus_softc *sc, 1103 const struct vmbus_message *msg) 1104{ 1105 const struct vmbus_chanmsg_choffer *offer; 1106 struct hv_vmbus_channel *chan; 1107 int error; 1108 1109 offer = (const struct vmbus_chanmsg_choffer *)msg->msg_data; 1110 1111 chan = vmbus_chan_alloc(sc); 1112 if (chan == NULL) { 1113 device_printf(sc->vmbus_dev, "allocate chan%u failed\n", 1114 offer->chm_chanid); 1115 return; 1116 } 1117 1118 chan->ch_id = offer->chm_chanid; 1119 chan->ch_subidx = offer->chm_subidx; 1120 chan->ch_guid_type = offer->chm_chtype; 1121 chan->ch_guid_inst = offer->chm_chinst; 1122 1123 /* Batch reading is on by default */ 1124 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD; 1125 1126 chan->ch_monprm->mp_connid = VMBUS_CONNID_EVENT; 1127 if (sc->vmbus_version != VMBUS_VERSION_WS2008) 1128 chan->ch_monprm->mp_connid = offer->chm_connid; 1129 1130 if (offer->chm_flags1 & VMBUS_CHOFFER_FLAG1_HASMNF) { 1131 /* 1132 * Setup MNF stuffs. 1133 */ 1134 chan->ch_flags |= VMBUS_CHAN_FLAG_HASMNF; 1135 chan->ch_montrig_idx = offer->chm_montrig / VMBUS_MONTRIG_LEN; 1136 if (chan->ch_montrig_idx >= VMBUS_MONTRIGS_MAX) 1137 panic("invalid monitor trigger %u", offer->chm_montrig); 1138 chan->ch_montrig_mask = 1139 1 << (offer->chm_montrig % VMBUS_MONTRIG_LEN); 1140 } 1141 1142 /* Select default cpu for this channel. */ 1143 vmbus_chan_cpu_default(chan); 1144 1145 error = vmbus_chan_add(chan); 1146 if (error) { 1147 device_printf(sc->vmbus_dev, "add chan%u failed: %d\n", 1148 chan->ch_id, error); 1149 vmbus_chan_free(chan); 1150 return; 1151 } 1152 1153 if (VMBUS_CHAN_ISPRIMARY(chan)) { 1154 /* 1155 * Add device for this primary channel. 1156 * 1157 * NOTE: 1158 * Error is ignored here; don't have much to do if error 1159 * really happens. 1160 */ 1161 vmbus_add_child(chan); 1162 } 1163} 1164 1165/* 1166 * XXX pretty broken; need rework. 1167 */ 1168static void 1169vmbus_chan_msgproc_chrescind(struct vmbus_softc *sc, 1170 const struct vmbus_message *msg) 1171{ 1172 const struct vmbus_chanmsg_chrescind *note; 1173 struct hv_vmbus_channel *chan; 1174 1175 note = (const struct vmbus_chanmsg_chrescind *)msg->msg_data; 1176 if (note->chm_chanid > VMBUS_CHAN_MAX) { 1177 device_printf(sc->vmbus_dev, "invalid rescinded chan%u\n", 1178 note->chm_chanid); 1179 return; 1180 } 1181 1182 if (bootverbose) { 1183 device_printf(sc->vmbus_dev, "chan%u rescinded\n", 1184 note->chm_chanid); 1185 } 1186 1187 chan = sc->vmbus_chmap[note->chm_chanid]; 1188 if (chan == NULL) 1189 return; 1190 sc->vmbus_chmap[note->chm_chanid] = NULL; 1191 1192 taskqueue_enqueue(taskqueue_thread, &chan->ch_detach_task); 1193} 1194 1195static void 1196vmbus_chan_detach_task(void *xchan, int pending __unused) 1197{ 1198 struct hv_vmbus_channel *chan = xchan; 1199 1200 if (VMBUS_CHAN_ISPRIMARY(chan)) { 1201 /* Only primary channel owns the device */ 1202 vmbus_delete_child(chan); 1203 /* NOTE: DO NOT free primary channel for now */ 1204 } else { 1205 struct vmbus_softc *sc = chan->vmbus_sc; 1206 struct hv_vmbus_channel *pri_chan = chan->ch_prichan; 1207 struct vmbus_chanmsg_chfree *req; 1208 struct vmbus_msghc *mh; 1209 int error; 1210 1211 mh = vmbus_msghc_get(sc, sizeof(*req)); 1212 if (mh == NULL) { 1213 device_printf(sc->vmbus_dev, 1214 "can not get msg hypercall for chfree(chan%u)\n", 1215 chan->ch_id); 1216 goto remove; 1217 } 1218 1219 req = vmbus_msghc_dataptr(mh); 1220 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHFREE; 1221 req->chm_chanid = chan->ch_id; 1222 1223 error = vmbus_msghc_exec_noresult(mh); 1224 vmbus_msghc_put(sc, mh); 1225 1226 if (error) { 1227 device_printf(sc->vmbus_dev, 1228 "chfree(chan%u) failed: %d", 1229 chan->ch_id, error); 1230 /* NOTE: Move on! */ 1231 } else { 1232 if (bootverbose) { 1233 device_printf(sc->vmbus_dev, "chan%u freed\n", 1234 chan->ch_id); 1235 } 1236 } 1237remove: 1238 mtx_lock(&pri_chan->ch_subchan_lock); 1239 TAILQ_REMOVE(&pri_chan->ch_subchans, chan, ch_sublink); 1240 KASSERT(pri_chan->ch_subchan_cnt > 0, 1241 ("invalid subchan_cnt %d", pri_chan->ch_subchan_cnt)); 1242 pri_chan->ch_subchan_cnt--; 1243 mtx_unlock(&pri_chan->ch_subchan_lock); 1244 wakeup(pri_chan); 1245 1246 vmbus_chan_free(chan); 1247 } 1248} 1249 1250/* 1251 * Detach all devices and destroy the corresponding primary channels. 1252 */ 1253void 1254vmbus_chan_destroy_all(struct vmbus_softc *sc) 1255{ 1256 struct hv_vmbus_channel *chan; 1257 1258 mtx_lock(&sc->vmbus_prichan_lock); 1259 while ((chan = TAILQ_FIRST(&sc->vmbus_prichans)) != NULL) { 1260 KASSERT(VMBUS_CHAN_ISPRIMARY(chan), ("not primary channel")); 1261 TAILQ_REMOVE(&sc->vmbus_prichans, chan, ch_prilink); 1262 mtx_unlock(&sc->vmbus_prichan_lock); 1263 1264 vmbus_delete_child(chan); 1265 vmbus_chan_free(chan); 1266 1267 mtx_lock(&sc->vmbus_prichan_lock); 1268 } 1269 bzero(sc->vmbus_chmap, 1270 sizeof(struct hv_vmbus_channel *) * VMBUS_CHAN_MAX); 1271 mtx_unlock(&sc->vmbus_prichan_lock); 1272} 1273 1274/** 1275 * @brief Select the best outgoing channel 1276 * 1277 * The channel whose vcpu binding is closest to the currect vcpu will 1278 * be selected. 1279 * If no multi-channel, always select primary channel 1280 * 1281 * @param primary - primary channel 1282 */ 1283struct hv_vmbus_channel * 1284vmbus_select_outgoing_channel(struct hv_vmbus_channel *primary) 1285{ 1286 hv_vmbus_channel *new_channel = NULL; 1287 hv_vmbus_channel *outgoing_channel = primary; 1288 int old_cpu_distance = 0; 1289 int new_cpu_distance = 0; 1290 int cur_vcpu = 0; 1291 int smp_pro_id = PCPU_GET(cpuid); 1292 1293 if (TAILQ_EMPTY(&primary->ch_subchans)) { 1294 return outgoing_channel; 1295 } 1296 1297 if (smp_pro_id >= MAXCPU) { 1298 return outgoing_channel; 1299 } 1300 1301 cur_vcpu = VMBUS_PCPU_GET(primary->vmbus_sc, vcpuid, smp_pro_id); 1302 1303 /* XXX need lock */ 1304 TAILQ_FOREACH(new_channel, &primary->ch_subchans, ch_sublink) { 1305 if ((new_channel->ch_stflags & VMBUS_CHAN_ST_OPENED) == 0) { 1306 continue; 1307 } 1308 1309 if (new_channel->ch_vcpuid == cur_vcpu){ 1310 return new_channel; 1311 } 1312 1313 old_cpu_distance = ((outgoing_channel->ch_vcpuid > cur_vcpu) ? 1314 (outgoing_channel->ch_vcpuid - cur_vcpu) : 1315 (cur_vcpu - outgoing_channel->ch_vcpuid)); 1316 1317 new_cpu_distance = ((new_channel->ch_vcpuid > cur_vcpu) ? 1318 (new_channel->ch_vcpuid - cur_vcpu) : 1319 (cur_vcpu - new_channel->ch_vcpuid)); 1320 1321 if (old_cpu_distance < new_cpu_distance) { 1322 continue; 1323 } 1324 1325 outgoing_channel = new_channel; 1326 } 1327 1328 return(outgoing_channel); 1329} 1330 1331struct hv_vmbus_channel ** 1332vmbus_subchan_get(struct hv_vmbus_channel *pri_chan, int subchan_cnt) 1333{ 1334 struct hv_vmbus_channel **ret, *chan; 1335 int i; 1336 1337 ret = malloc(subchan_cnt * sizeof(struct hv_vmbus_channel *), M_TEMP, 1338 M_WAITOK); 1339 1340 mtx_lock(&pri_chan->ch_subchan_lock); 1341 1342 while (pri_chan->ch_subchan_cnt < subchan_cnt) 1343 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "subch", 0); 1344 1345 i = 0; 1346 TAILQ_FOREACH(chan, &pri_chan->ch_subchans, ch_sublink) { 1347 /* TODO: refcnt chan */ 1348 ret[i] = chan; 1349 1350 ++i; 1351 if (i == subchan_cnt) 1352 break; 1353 } 1354 KASSERT(i == subchan_cnt, ("invalid subchan count %d, should be %d", 1355 pri_chan->ch_subchan_cnt, subchan_cnt)); 1356 1357 mtx_unlock(&pri_chan->ch_subchan_lock); 1358 1359 return ret; 1360} 1361 1362void 1363vmbus_subchan_rel(struct hv_vmbus_channel **subchan, int subchan_cnt __unused) 1364{ 1365 1366 free(subchan, M_TEMP); 1367} 1368 1369void 1370vmbus_subchan_drain(struct hv_vmbus_channel *pri_chan) 1371{ 1372 mtx_lock(&pri_chan->ch_subchan_lock); 1373 while (pri_chan->ch_subchan_cnt > 0) 1374 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "dsubch", 0); 1375 mtx_unlock(&pri_chan->ch_subchan_lock); 1376} 1377 1378void 1379vmbus_chan_msgproc(struct vmbus_softc *sc, const struct vmbus_message *msg) 1380{ 1381 vmbus_chanmsg_proc_t msg_proc; 1382 uint32_t msg_type; 1383 1384 msg_type = ((const struct vmbus_chanmsg_hdr *)msg->msg_data)->chm_type; 1385 KASSERT(msg_type < VMBUS_CHANMSG_TYPE_MAX, 1386 ("invalid message type %u", msg_type)); 1387 1388 msg_proc = vmbus_chan_msgprocs[msg_type]; 1389 if (msg_proc != NULL) 1390 msg_proc(sc, msg); 1391} 1392