vmbus_chan.c revision 302891
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 302891 2016-07-15 08:31:53Z 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_channel_sysctl_monalloc(SYSCTL_HANDLER_ARGS) 103{ 104 struct hv_vmbus_channel *chan = arg1; 105 int alloc = 0; 106 107 if (chan->ch_flags & VMBUS_CHAN_FLAG_HASMNF) 108 alloc = 1; 109 return sysctl_handle_int(oidp, &alloc, 0, req); 110} 111 112static void 113vmbus_channel_sysctl_create(hv_vmbus_channel* channel) 114{ 115 device_t dev; 116 struct sysctl_oid *devch_sysctl; 117 struct sysctl_oid *devch_id_sysctl, *devch_sub_sysctl; 118 struct sysctl_oid *devch_id_in_sysctl, *devch_id_out_sysctl; 119 struct sysctl_ctx_list *ctx; 120 uint32_t ch_id; 121 uint16_t sub_ch_id; 122 char name[16]; 123 124 hv_vmbus_channel* primary_ch = channel->ch_prichan; 125 126 if (primary_ch == NULL) { 127 dev = channel->ch_dev; 128 ch_id = channel->ch_id; 129 } else { 130 dev = primary_ch->ch_dev; 131 ch_id = primary_ch->ch_id; 132 sub_ch_id = channel->ch_subidx; 133 } 134 ctx = &channel->ch_sysctl_ctx; 135 sysctl_ctx_init(ctx); 136 /* This creates dev.DEVNAME.DEVUNIT.channel tree */ 137 devch_sysctl = SYSCTL_ADD_NODE(ctx, 138 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 139 OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 140 /* This creates dev.DEVNAME.DEVUNIT.channel.CHANID tree */ 141 snprintf(name, sizeof(name), "%d", ch_id); 142 devch_id_sysctl = SYSCTL_ADD_NODE(ctx, 143 SYSCTL_CHILDREN(devch_sysctl), 144 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 145 146 if (primary_ch != NULL) { 147 devch_sub_sysctl = SYSCTL_ADD_NODE(ctx, 148 SYSCTL_CHILDREN(devch_id_sysctl), 149 OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 150 snprintf(name, sizeof(name), "%d", sub_ch_id); 151 devch_id_sysctl = SYSCTL_ADD_NODE(ctx, 152 SYSCTL_CHILDREN(devch_sub_sysctl), 153 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 154 155 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), 156 OID_AUTO, "chanid", CTLFLAG_RD, 157 &channel->ch_id, 0, "channel id"); 158 } 159 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, 160 "cpu", CTLFLAG_RD, &channel->ch_cpuid, 0, "owner CPU id"); 161 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, 162 "monitor_allocated", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 163 channel, 0, vmbus_channel_sysctl_monalloc, "I", 164 "is monitor allocated to this channel"); 165 166 devch_id_in_sysctl = SYSCTL_ADD_NODE(ctx, 167 SYSCTL_CHILDREN(devch_id_sysctl), 168 OID_AUTO, 169 "in", 170 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 171 devch_id_out_sysctl = SYSCTL_ADD_NODE(ctx, 172 SYSCTL_CHILDREN(devch_id_sysctl), 173 OID_AUTO, 174 "out", 175 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 176 hv_ring_buffer_stat(ctx, 177 SYSCTL_CHILDREN(devch_id_in_sysctl), 178 &(channel->inbound), 179 "inbound ring buffer stats"); 180 hv_ring_buffer_stat(ctx, 181 SYSCTL_CHILDREN(devch_id_out_sysctl), 182 &(channel->outbound), 183 "outbound ring buffer stats"); 184} 185 186/** 187 * @brief Open the specified channel 188 */ 189int 190hv_vmbus_channel_open( 191 hv_vmbus_channel* new_channel, 192 uint32_t send_ring_buffer_size, 193 uint32_t recv_ring_buffer_size, 194 void* user_data, 195 uint32_t user_data_len, 196 vmbus_chan_callback_t cb, 197 void *cbarg) 198{ 199 struct vmbus_softc *sc = new_channel->vmbus_sc; 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 ret = 0; 206 uint8_t *br; 207 208 if (user_data_len > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) { 209 device_printf(sc->vmbus_dev, 210 "invalid udata len %u for chan%u\n", 211 user_data_len, new_channel->ch_id); 212 return EINVAL; 213 } 214 KASSERT((send_ring_buffer_size & PAGE_MASK) == 0, 215 ("send bufring size is not multiple page")); 216 KASSERT((recv_ring_buffer_size & PAGE_MASK) == 0, 217 ("recv bufring size is not multiple page")); 218 219 if (atomic_testandset_int(&new_channel->ch_stflags, 220 VMBUS_CHAN_ST_OPENED_SHIFT)) 221 panic("double-open chan%u", new_channel->ch_id); 222 223 new_channel->ch_cb = cb; 224 new_channel->ch_cbarg = cbarg; 225 226 vmbus_chan_update_evtflagcnt(sc, new_channel); 227 228 new_channel->ch_tq = VMBUS_PCPU_GET(new_channel->vmbus_sc, event_tq, 229 new_channel->ch_cpuid); 230 if (new_channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) { 231 TASK_INIT(&new_channel->ch_task, 0, vmbus_chan_task, 232 new_channel); 233 } else { 234 TASK_INIT(&new_channel->ch_task, 0, vmbus_chan_task_nobatch, 235 new_channel); 236 } 237 238 /* 239 * Allocate the TX+RX bufrings. 240 * XXX should use ch_dev dtag 241 */ 242 br = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev), 243 PAGE_SIZE, 0, send_ring_buffer_size + recv_ring_buffer_size, 244 &new_channel->ch_bufring_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); 245 if (br == NULL) { 246 device_printf(sc->vmbus_dev, "bufring allocation failed\n"); 247 ret = ENOMEM; 248 goto failed; 249 } 250 new_channel->ch_bufring = br; 251 252 /* TX bufring comes first */ 253 hv_vmbus_ring_buffer_init(&new_channel->outbound, 254 br, send_ring_buffer_size); 255 /* RX bufring immediately follows TX bufring */ 256 hv_vmbus_ring_buffer_init(&new_channel->inbound, 257 br + send_ring_buffer_size, recv_ring_buffer_size); 258 259 /* Create sysctl tree for this channel */ 260 vmbus_channel_sysctl_create(new_channel); 261 262 /* 263 * Connect the bufrings, both RX and TX, to this channel. 264 */ 265 ret = vmbus_chan_gpadl_connect(new_channel, 266 new_channel->ch_bufring_dma.hv_paddr, 267 send_ring_buffer_size + recv_ring_buffer_size, 268 &new_channel->ch_bufring_gpadl); 269 if (ret != 0) { 270 device_printf(sc->vmbus_dev, 271 "failed to connect bufring GPADL to chan%u\n", 272 new_channel->ch_id); 273 goto failed; 274 } 275 276 /* 277 * Open channel w/ the bufring GPADL on the target CPU. 278 */ 279 mh = vmbus_msghc_get(sc, sizeof(*req)); 280 if (mh == NULL) { 281 device_printf(sc->vmbus_dev, 282 "can not get msg hypercall for chopen(chan%u)\n", 283 new_channel->ch_id); 284 ret = ENXIO; 285 goto failed; 286 } 287 288 req = vmbus_msghc_dataptr(mh); 289 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN; 290 req->chm_chanid = new_channel->ch_id; 291 req->chm_openid = new_channel->ch_id; 292 req->chm_gpadl = new_channel->ch_bufring_gpadl; 293 req->chm_vcpuid = new_channel->ch_vcpuid; 294 req->chm_rxbr_pgofs = send_ring_buffer_size >> PAGE_SHIFT; 295 if (user_data_len) 296 memcpy(req->chm_udata, user_data, user_data_len); 297 298 ret = vmbus_msghc_exec(sc, mh); 299 if (ret != 0) { 300 device_printf(sc->vmbus_dev, 301 "chopen(chan%u) msg hypercall exec failed: %d\n", 302 new_channel->ch_id, ret); 303 vmbus_msghc_put(sc, mh); 304 goto failed; 305 } 306 307 msg = vmbus_msghc_wait_result(sc, mh); 308 resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data; 309 status = resp->chm_status; 310 311 vmbus_msghc_put(sc, mh); 312 313 if (status == 0) { 314 if (bootverbose) { 315 device_printf(sc->vmbus_dev, "chan%u opened\n", 316 new_channel->ch_id); 317 } 318 return 0; 319 } 320 321 device_printf(sc->vmbus_dev, "failed to open chan%u\n", 322 new_channel->ch_id); 323 ret = ENXIO; 324 325failed: 326 if (new_channel->ch_bufring_gpadl) { 327 vmbus_chan_gpadl_disconnect(new_channel, 328 new_channel->ch_bufring_gpadl); 329 new_channel->ch_bufring_gpadl = 0; 330 } 331 if (new_channel->ch_bufring != NULL) { 332 hyperv_dmamem_free(&new_channel->ch_bufring_dma, 333 new_channel->ch_bufring); 334 new_channel->ch_bufring = NULL; 335 } 336 atomic_clear_int(&new_channel->ch_stflags, VMBUS_CHAN_ST_OPENED); 337 return ret; 338} 339 340int 341vmbus_chan_gpadl_connect(struct hv_vmbus_channel *chan, bus_addr_t paddr, 342 int size, uint32_t *gpadl0) 343{ 344 struct vmbus_softc *sc = chan->vmbus_sc; 345 struct vmbus_msghc *mh; 346 struct vmbus_chanmsg_gpadl_conn *req; 347 const struct vmbus_message *msg; 348 size_t reqsz; 349 uint32_t gpadl, status; 350 int page_count, range_len, i, cnt, error; 351 uint64_t page_id; 352 353 /* 354 * Preliminary checks. 355 */ 356 357 KASSERT((size & PAGE_MASK) == 0, 358 ("invalid GPA size %d, not multiple page size", size)); 359 page_count = size >> PAGE_SHIFT; 360 361 KASSERT((paddr & PAGE_MASK) == 0, 362 ("GPA is not page aligned %jx", (uintmax_t)paddr)); 363 page_id = paddr >> PAGE_SHIFT; 364 365 range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); 366 /* 367 * We don't support multiple GPA ranges. 368 */ 369 if (range_len > UINT16_MAX) { 370 device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", 371 page_count); 372 return EOPNOTSUPP; 373 } 374 375 /* 376 * Allocate GPADL id. 377 */ 378 gpadl = vmbus_gpadl_alloc(sc); 379 *gpadl0 = gpadl; 380 381 /* 382 * Connect this GPADL to the target channel. 383 * 384 * NOTE: 385 * Since each message can only hold small set of page 386 * addresses, several messages may be required to 387 * complete the connection. 388 */ 389 if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) 390 cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; 391 else 392 cnt = page_count; 393 page_count -= cnt; 394 395 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, 396 chm_range.gpa_page[cnt]); 397 mh = vmbus_msghc_get(sc, reqsz); 398 if (mh == NULL) { 399 device_printf(sc->vmbus_dev, 400 "can not get msg hypercall for gpadl->chan%u\n", 401 chan->ch_id); 402 return EIO; 403 } 404 405 req = vmbus_msghc_dataptr(mh); 406 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN; 407 req->chm_chanid = chan->ch_id; 408 req->chm_gpadl = gpadl; 409 req->chm_range_len = range_len; 410 req->chm_range_cnt = 1; 411 req->chm_range.gpa_len = size; 412 req->chm_range.gpa_ofs = 0; 413 for (i = 0; i < cnt; ++i) 414 req->chm_range.gpa_page[i] = page_id++; 415 416 error = vmbus_msghc_exec(sc, mh); 417 if (error) { 418 device_printf(sc->vmbus_dev, 419 "gpadl->chan%u msg hypercall exec failed: %d\n", 420 chan->ch_id, error); 421 vmbus_msghc_put(sc, mh); 422 return error; 423 } 424 425 while (page_count > 0) { 426 struct vmbus_chanmsg_gpadl_subconn *subreq; 427 428 if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) 429 cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; 430 else 431 cnt = page_count; 432 page_count -= cnt; 433 434 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, 435 chm_gpa_page[cnt]); 436 vmbus_msghc_reset(mh, reqsz); 437 438 subreq = vmbus_msghc_dataptr(mh); 439 subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN; 440 subreq->chm_gpadl = gpadl; 441 for (i = 0; i < cnt; ++i) 442 subreq->chm_gpa_page[i] = page_id++; 443 444 vmbus_msghc_exec_noresult(mh); 445 } 446 KASSERT(page_count == 0, ("invalid page count %d", page_count)); 447 448 msg = vmbus_msghc_wait_result(sc, mh); 449 status = ((const struct vmbus_chanmsg_gpadl_connresp *) 450 msg->msg_data)->chm_status; 451 452 vmbus_msghc_put(sc, mh); 453 454 if (status != 0) { 455 device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " 456 "status %u\n", chan->ch_id, status); 457 return EIO; 458 } else { 459 if (bootverbose) { 460 device_printf(sc->vmbus_dev, "gpadl->chan%u " 461 "succeeded\n", chan->ch_id); 462 } 463 } 464 return 0; 465} 466 467/* 468 * Disconnect the GPA from the target channel 469 */ 470int 471vmbus_chan_gpadl_disconnect(struct hv_vmbus_channel *chan, uint32_t gpadl) 472{ 473 struct vmbus_softc *sc = chan->vmbus_sc; 474 struct vmbus_msghc *mh; 475 struct vmbus_chanmsg_gpadl_disconn *req; 476 int error; 477 478 mh = vmbus_msghc_get(sc, sizeof(*req)); 479 if (mh == NULL) { 480 device_printf(sc->vmbus_dev, 481 "can not get msg hypercall for gpa x->chan%u\n", 482 chan->ch_id); 483 return EBUSY; 484 } 485 486 req = vmbus_msghc_dataptr(mh); 487 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN; 488 req->chm_chanid = chan->ch_id; 489 req->chm_gpadl = gpadl; 490 491 error = vmbus_msghc_exec(sc, mh); 492 if (error) { 493 device_printf(sc->vmbus_dev, 494 "gpa x->chan%u msg hypercall exec failed: %d\n", 495 chan->ch_id, error); 496 vmbus_msghc_put(sc, mh); 497 return error; 498 } 499 500 vmbus_msghc_wait_result(sc, mh); 501 /* Discard result; no useful information */ 502 vmbus_msghc_put(sc, mh); 503 504 return 0; 505} 506 507static void 508vmbus_chan_close_internal(struct hv_vmbus_channel *chan) 509{ 510 struct vmbus_softc *sc = chan->vmbus_sc; 511 struct vmbus_msghc *mh; 512 struct vmbus_chanmsg_chclose *req; 513 struct taskqueue *tq = chan->ch_tq; 514 int error; 515 516 /* TODO: stringent check */ 517 atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED); 518 519 /* 520 * Free this channel's sysctl tree attached to its device's 521 * sysctl tree. 522 */ 523 sysctl_ctx_free(&chan->ch_sysctl_ctx); 524 525 /* 526 * Set ch_tq to NULL to avoid more requests be scheduled. 527 * XXX pretty broken; need rework. 528 */ 529 chan->ch_tq = NULL; 530 taskqueue_drain(tq, &chan->ch_task); 531 chan->ch_cb = NULL; 532 533 /* 534 * Close this channel. 535 */ 536 mh = vmbus_msghc_get(sc, sizeof(*req)); 537 if (mh == NULL) { 538 device_printf(sc->vmbus_dev, 539 "can not get msg hypercall for chclose(chan%u)\n", 540 chan->ch_id); 541 return; 542 } 543 544 req = vmbus_msghc_dataptr(mh); 545 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; 546 req->chm_chanid = chan->ch_id; 547 548 error = vmbus_msghc_exec_noresult(mh); 549 vmbus_msghc_put(sc, mh); 550 551 if (error) { 552 device_printf(sc->vmbus_dev, 553 "chclose(chan%u) msg hypercall exec failed: %d\n", 554 chan->ch_id, error); 555 return; 556 } else if (bootverbose) { 557 device_printf(sc->vmbus_dev, "close chan%u\n", chan->ch_id); 558 } 559 560 /* 561 * Disconnect the TX+RX bufrings from this channel. 562 */ 563 if (chan->ch_bufring_gpadl) { 564 vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl); 565 chan->ch_bufring_gpadl = 0; 566 } 567 568 /* 569 * Destroy the TX+RX bufrings. 570 */ 571 hv_ring_buffer_cleanup(&chan->outbound); 572 hv_ring_buffer_cleanup(&chan->inbound); 573 if (chan->ch_bufring != NULL) { 574 hyperv_dmamem_free(&chan->ch_bufring_dma, chan->ch_bufring); 575 chan->ch_bufring = NULL; 576 } 577} 578 579/* 580 * Caller should make sure that all sub-channels have 581 * been added to 'chan' and all to-be-closed channels 582 * are not being opened. 583 */ 584void 585hv_vmbus_channel_close(struct hv_vmbus_channel *chan) 586{ 587 int subchan_cnt; 588 589 if (!VMBUS_CHAN_ISPRIMARY(chan)) { 590 /* 591 * Sub-channel is closed when its primary channel 592 * is closed; done. 593 */ 594 return; 595 } 596 597 /* 598 * Close all sub-channels, if any. 599 */ 600 subchan_cnt = chan->ch_subchan_cnt; 601 if (subchan_cnt > 0) { 602 struct hv_vmbus_channel **subchan; 603 int i; 604 605 subchan = vmbus_subchan_get(chan, subchan_cnt); 606 for (i = 0; i < subchan_cnt; ++i) 607 vmbus_chan_close_internal(subchan[i]); 608 vmbus_subchan_rel(subchan, subchan_cnt); 609 } 610 611 /* Then close the primary channel. */ 612 vmbus_chan_close_internal(chan); 613} 614 615int 616vmbus_chan_send(struct hv_vmbus_channel *chan, uint16_t type, uint16_t flags, 617 void *data, int dlen, uint64_t xactid) 618{ 619 struct vmbus_chanpkt pkt; 620 int pktlen, pad_pktlen, hlen, error; 621 uint64_t pad = 0; 622 struct iovec iov[3]; 623 boolean_t send_evt; 624 625 hlen = sizeof(pkt); 626 pktlen = hlen + dlen; 627 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 628 629 pkt.cp_hdr.cph_type = type; 630 pkt.cp_hdr.cph_flags = flags; 631 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 632 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 633 pkt.cp_hdr.cph_xactid = xactid; 634 635 iov[0].iov_base = &pkt; 636 iov[0].iov_len = hlen; 637 iov[1].iov_base = data; 638 iov[1].iov_len = dlen; 639 iov[2].iov_base = &pad; 640 iov[2].iov_len = pad_pktlen - pktlen; 641 642 error = hv_ring_buffer_write(&chan->outbound, iov, 3, &send_evt); 643 if (!error && send_evt) 644 vmbus_chan_send_event(chan); 645 return error; 646} 647 648int 649vmbus_chan_send_sglist(struct hv_vmbus_channel *chan, 650 struct vmbus_gpa sg[], int sglen, void *data, int dlen, uint64_t xactid) 651{ 652 struct vmbus_chanpkt_sglist pkt; 653 int pktlen, pad_pktlen, hlen, error; 654 struct iovec iov[4]; 655 boolean_t send_evt; 656 uint64_t pad = 0; 657 658 KASSERT(sglen < VMBUS_CHAN_SGLIST_MAX, 659 ("invalid sglist len %d", sglen)); 660 661 hlen = __offsetof(struct vmbus_chanpkt_sglist, cp_gpa[sglen]); 662 pktlen = hlen + dlen; 663 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 664 665 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; 666 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; 667 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 668 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 669 pkt.cp_hdr.cph_xactid = xactid; 670 pkt.cp_rsvd = 0; 671 pkt.cp_gpa_cnt = sglen; 672 673 iov[0].iov_base = &pkt; 674 iov[0].iov_len = sizeof(pkt); 675 iov[1].iov_base = sg; 676 iov[1].iov_len = sizeof(struct vmbus_gpa) * sglen; 677 iov[2].iov_base = data; 678 iov[2].iov_len = dlen; 679 iov[3].iov_base = &pad; 680 iov[3].iov_len = pad_pktlen - pktlen; 681 682 error = hv_ring_buffer_write(&chan->outbound, iov, 4, &send_evt); 683 if (!error && send_evt) 684 vmbus_chan_send_event(chan); 685 return error; 686} 687 688int 689vmbus_chan_send_prplist(struct hv_vmbus_channel *chan, 690 struct vmbus_gpa_range *prp, int prp_cnt, void *data, int dlen, 691 uint64_t xactid) 692{ 693 struct vmbus_chanpkt_prplist pkt; 694 int pktlen, pad_pktlen, hlen, error; 695 struct iovec iov[4]; 696 boolean_t send_evt; 697 uint64_t pad = 0; 698 699 KASSERT(prp_cnt < VMBUS_CHAN_PRPLIST_MAX, 700 ("invalid prplist entry count %d", prp_cnt)); 701 702 hlen = __offsetof(struct vmbus_chanpkt_prplist, 703 cp_range[0].gpa_page[prp_cnt]); 704 pktlen = hlen + dlen; 705 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 706 707 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; 708 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; 709 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 710 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 711 pkt.cp_hdr.cph_xactid = xactid; 712 pkt.cp_rsvd = 0; 713 pkt.cp_range_cnt = 1; 714 715 iov[0].iov_base = &pkt; 716 iov[0].iov_len = sizeof(pkt); 717 iov[1].iov_base = prp; 718 iov[1].iov_len = __offsetof(struct vmbus_gpa_range, gpa_page[prp_cnt]); 719 iov[2].iov_base = data; 720 iov[2].iov_len = dlen; 721 iov[3].iov_base = &pad; 722 iov[3].iov_len = pad_pktlen - pktlen; 723 724 error = hv_ring_buffer_write(&chan->outbound, iov, 4, &send_evt); 725 if (!error && send_evt) 726 vmbus_chan_send_event(chan); 727 return error; 728} 729 730int 731vmbus_chan_recv(struct hv_vmbus_channel *chan, void *data, int *dlen0, 732 uint64_t *xactid) 733{ 734 struct vmbus_chanpkt_hdr pkt; 735 int error, dlen, hlen; 736 737 error = hv_ring_buffer_peek(&chan->inbound, &pkt, sizeof(pkt)); 738 if (error) 739 return error; 740 741 hlen = VMBUS_CHANPKT_GETLEN(pkt.cph_hlen); 742 dlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen) - hlen; 743 744 if (*dlen0 < dlen) { 745 /* Return the size of this packet's data. */ 746 *dlen0 = dlen; 747 return ENOBUFS; 748 } 749 750 *xactid = pkt.cph_xactid; 751 *dlen0 = dlen; 752 753 /* Skip packet header */ 754 error = hv_ring_buffer_read(&chan->inbound, data, dlen, hlen); 755 KASSERT(!error, ("hv_ring_buffer_read failed")); 756 757 return 0; 758} 759 760int 761vmbus_chan_recv_pkt(struct hv_vmbus_channel *chan, 762 struct vmbus_chanpkt_hdr *pkt0, int *pktlen0) 763{ 764 struct vmbus_chanpkt_hdr pkt; 765 int error, pktlen; 766 767 error = hv_ring_buffer_peek(&chan->inbound, &pkt, sizeof(pkt)); 768 if (error) 769 return error; 770 771 pktlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen); 772 if (*pktlen0 < pktlen) { 773 /* Return the size of this packet. */ 774 *pktlen0 = pktlen; 775 return ENOBUFS; 776 } 777 *pktlen0 = pktlen; 778 779 /* Include packet header */ 780 error = hv_ring_buffer_read(&chan->inbound, pkt0, pktlen, 0); 781 KASSERT(!error, ("hv_ring_buffer_read failed")); 782 783 return 0; 784} 785 786static void 787vmbus_chan_task(void *xchan, int pending __unused) 788{ 789 struct hv_vmbus_channel *chan = xchan; 790 vmbus_chan_callback_t cb = chan->ch_cb; 791 void *cbarg = chan->ch_cbarg; 792 793 /* 794 * Optimize host to guest signaling by ensuring: 795 * 1. While reading the channel, we disable interrupts from 796 * host. 797 * 2. Ensure that we process all posted messages from the host 798 * before returning from this callback. 799 * 3. Once we return, enable signaling from the host. Once this 800 * state is set we check to see if additional packets are 801 * available to read. In this case we repeat the process. 802 * 803 * NOTE: Interrupt has been disabled in the ISR. 804 */ 805 for (;;) { 806 uint32_t left; 807 808 cb(cbarg); 809 810 left = hv_ring_buffer_read_end(&chan->inbound); 811 if (left == 0) { 812 /* No more data in RX bufring; done */ 813 break; 814 } 815 hv_ring_buffer_read_begin(&chan->inbound); 816 } 817} 818 819static void 820vmbus_chan_task_nobatch(void *xchan, int pending __unused) 821{ 822 struct hv_vmbus_channel *chan = xchan; 823 824 chan->ch_cb(chan->ch_cbarg); 825} 826 827static __inline void 828vmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags, 829 int flag_cnt) 830{ 831 int f; 832 833 for (f = 0; f < flag_cnt; ++f) { 834 uint32_t chid_base; 835 u_long flags; 836 int chid_ofs; 837 838 if (event_flags[f] == 0) 839 continue; 840 841 flags = atomic_swap_long(&event_flags[f], 0); 842 chid_base = f << VMBUS_EVTFLAG_SHIFT; 843 844 while ((chid_ofs = ffsl(flags)) != 0) { 845 struct hv_vmbus_channel *channel; 846 847 --chid_ofs; /* NOTE: ffsl is 1-based */ 848 flags &= ~(1UL << chid_ofs); 849 850 channel = sc->vmbus_chmap[chid_base + chid_ofs]; 851 852 /* if channel is closed or closing */ 853 if (channel == NULL || channel->ch_tq == NULL) 854 continue; 855 856 if (channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) 857 hv_ring_buffer_read_begin(&channel->inbound); 858 taskqueue_enqueue(channel->ch_tq, &channel->ch_task); 859 } 860 } 861} 862 863void 864vmbus_event_proc(struct vmbus_softc *sc, int cpu) 865{ 866 struct vmbus_evtflags *eventf; 867 868 /* 869 * On Host with Win8 or above, the event page can be checked directly 870 * to get the id of the channel that has the pending interrupt. 871 */ 872 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 873 vmbus_event_flags_proc(sc, eventf->evt_flags, 874 VMBUS_PCPU_GET(sc, event_flags_cnt, cpu)); 875} 876 877void 878vmbus_event_proc_compat(struct vmbus_softc *sc, int cpu) 879{ 880 struct vmbus_evtflags *eventf; 881 882 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 883 if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) { 884 vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags, 885 VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT); 886 } 887} 888 889static void 890vmbus_chan_update_evtflagcnt(struct vmbus_softc *sc, 891 const struct hv_vmbus_channel *chan) 892{ 893 volatile int *flag_cnt_ptr; 894 int flag_cnt; 895 896 flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1; 897 flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->ch_cpuid); 898 899 for (;;) { 900 int old_flag_cnt; 901 902 old_flag_cnt = *flag_cnt_ptr; 903 if (old_flag_cnt >= flag_cnt) 904 break; 905 if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) { 906 if (bootverbose) { 907 device_printf(sc->vmbus_dev, 908 "channel%u update cpu%d flag_cnt to %d\n", 909 chan->ch_id, chan->ch_cpuid, flag_cnt); 910 } 911 break; 912 } 913 } 914} 915 916static struct hv_vmbus_channel * 917vmbus_chan_alloc(struct vmbus_softc *sc) 918{ 919 struct hv_vmbus_channel *chan; 920 921 chan = malloc(sizeof(*chan), M_DEVBUF, M_WAITOK | M_ZERO); 922 923 chan->ch_monprm = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev), 924 HYPERCALL_PARAM_ALIGN, 0, sizeof(struct hyperv_mon_param), 925 &chan->ch_monprm_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); 926 if (chan->ch_monprm == NULL) { 927 device_printf(sc->vmbus_dev, "monprm alloc failed\n"); 928 free(chan, M_DEVBUF); 929 return NULL; 930 } 931 932 chan->vmbus_sc = sc; 933 mtx_init(&chan->ch_subchan_lock, "vmbus subchan", NULL, MTX_DEF); 934 TAILQ_INIT(&chan->ch_subchans); 935 TASK_INIT(&chan->ch_detach_task, 0, vmbus_chan_detach_task, chan); 936 937 return chan; 938} 939 940static void 941vmbus_chan_free(struct hv_vmbus_channel *chan) 942{ 943 /* TODO: assert sub-channel list is empty */ 944 /* TODO: asset no longer on the primary channel's sub-channel list */ 945 /* TODO: asset no longer on the vmbus channel list */ 946 hyperv_dmamem_free(&chan->ch_monprm_dma, chan->ch_monprm); 947 mtx_destroy(&chan->ch_subchan_lock); 948 free(chan, M_DEVBUF); 949} 950 951static int 952vmbus_chan_add(struct hv_vmbus_channel *newchan) 953{ 954 struct vmbus_softc *sc = newchan->vmbus_sc; 955 struct hv_vmbus_channel *prichan; 956 957 if (newchan->ch_id == 0) { 958 /* 959 * XXX 960 * Chan0 will neither be processed nor should be offered; 961 * skip it. 962 */ 963 device_printf(sc->vmbus_dev, "got chan0 offer, discard\n"); 964 return EINVAL; 965 } else if (newchan->ch_id >= VMBUS_CHAN_MAX) { 966 device_printf(sc->vmbus_dev, "invalid chan%u offer\n", 967 newchan->ch_id); 968 return EINVAL; 969 } 970 sc->vmbus_chmap[newchan->ch_id] = newchan; 971 972 if (bootverbose) { 973 device_printf(sc->vmbus_dev, "chan%u subidx%u offer\n", 974 newchan->ch_id, newchan->ch_subidx); 975 } 976 977 mtx_lock(&sc->vmbus_prichan_lock); 978 TAILQ_FOREACH(prichan, &sc->vmbus_prichans, ch_prilink) { 979 /* 980 * Sub-channel will have the same type GUID and instance 981 * GUID as its primary channel. 982 */ 983 if (memcmp(&prichan->ch_guid_type, &newchan->ch_guid_type, 984 sizeof(struct hyperv_guid)) == 0 && 985 memcmp(&prichan->ch_guid_inst, &newchan->ch_guid_inst, 986 sizeof(struct hyperv_guid)) == 0) 987 break; 988 } 989 if (VMBUS_CHAN_ISPRIMARY(newchan)) { 990 if (prichan == NULL) { 991 /* Install the new primary channel */ 992 TAILQ_INSERT_TAIL(&sc->vmbus_prichans, newchan, 993 ch_prilink); 994 mtx_unlock(&sc->vmbus_prichan_lock); 995 return 0; 996 } else { 997 mtx_unlock(&sc->vmbus_prichan_lock); 998 device_printf(sc->vmbus_dev, "duplicated primary " 999 "chan%u\n", newchan->ch_id); 1000 return EINVAL; 1001 } 1002 } else { /* Sub-channel */ 1003 if (prichan == NULL) { 1004 mtx_unlock(&sc->vmbus_prichan_lock); 1005 device_printf(sc->vmbus_dev, "no primary chan for " 1006 "chan%u\n", newchan->ch_id); 1007 return EINVAL; 1008 } 1009 /* 1010 * Found the primary channel for this sub-channel and 1011 * move on. 1012 * 1013 * XXX refcnt prichan 1014 */ 1015 } 1016 mtx_unlock(&sc->vmbus_prichan_lock); 1017 1018 /* 1019 * This is a sub-channel; link it with the primary channel. 1020 */ 1021 KASSERT(!VMBUS_CHAN_ISPRIMARY(newchan), 1022 ("new channel is not sub-channel")); 1023 KASSERT(prichan != NULL, ("no primary channel")); 1024 1025 newchan->ch_prichan = prichan; 1026 newchan->ch_dev = prichan->ch_dev; 1027 1028 mtx_lock(&prichan->ch_subchan_lock); 1029 TAILQ_INSERT_TAIL(&prichan->ch_subchans, newchan, ch_sublink); 1030 /* 1031 * Bump up sub-channel count and notify anyone that is 1032 * interested in this sub-channel, after this sub-channel 1033 * is setup. 1034 */ 1035 prichan->ch_subchan_cnt++; 1036 mtx_unlock(&prichan->ch_subchan_lock); 1037 wakeup(prichan); 1038 1039 return 0; 1040} 1041 1042void 1043vmbus_chan_cpu_set(struct hv_vmbus_channel *chan, int cpu) 1044{ 1045 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpu %d", cpu)); 1046 1047 if (chan->vmbus_sc->vmbus_version == VMBUS_VERSION_WS2008 || 1048 chan->vmbus_sc->vmbus_version == VMBUS_VERSION_WIN7) { 1049 /* Only cpu0 is supported */ 1050 cpu = 0; 1051 } 1052 1053 chan->ch_cpuid = cpu; 1054 chan->ch_vcpuid = VMBUS_PCPU_GET(chan->vmbus_sc, vcpuid, cpu); 1055 1056 if (bootverbose) { 1057 printf("vmbus_chan%u: assigned to cpu%u [vcpu%u]\n", 1058 chan->ch_id, chan->ch_cpuid, chan->ch_vcpuid); 1059 } 1060} 1061 1062void 1063vmbus_chan_cpu_rr(struct hv_vmbus_channel *chan) 1064{ 1065 static uint32_t vmbus_chan_nextcpu; 1066 int cpu; 1067 1068 cpu = atomic_fetchadd_int(&vmbus_chan_nextcpu, 1) % mp_ncpus; 1069 vmbus_chan_cpu_set(chan, cpu); 1070} 1071 1072static void 1073vmbus_chan_cpu_default(struct hv_vmbus_channel *chan) 1074{ 1075 /* 1076 * By default, pin the channel to cpu0. Devices having 1077 * special channel-cpu mapping requirement should call 1078 * vmbus_chan_cpu_{set,rr}(). 1079 */ 1080 vmbus_chan_cpu_set(chan, 0); 1081} 1082 1083static void 1084vmbus_chan_msgproc_choffer(struct vmbus_softc *sc, 1085 const struct vmbus_message *msg) 1086{ 1087 const struct vmbus_chanmsg_choffer *offer; 1088 struct hv_vmbus_channel *chan; 1089 int error; 1090 1091 offer = (const struct vmbus_chanmsg_choffer *)msg->msg_data; 1092 1093 chan = vmbus_chan_alloc(sc); 1094 if (chan == NULL) { 1095 device_printf(sc->vmbus_dev, "allocate chan%u failed\n", 1096 offer->chm_chanid); 1097 return; 1098 } 1099 1100 chan->ch_id = offer->chm_chanid; 1101 chan->ch_subidx = offer->chm_subidx; 1102 chan->ch_guid_type = offer->chm_chtype; 1103 chan->ch_guid_inst = offer->chm_chinst; 1104 1105 /* Batch reading is on by default */ 1106 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD; 1107 1108 chan->ch_monprm->mp_connid = VMBUS_CONNID_EVENT; 1109 if (sc->vmbus_version != VMBUS_VERSION_WS2008) 1110 chan->ch_monprm->mp_connid = offer->chm_connid; 1111 1112 if (offer->chm_flags1 & VMBUS_CHOFFER_FLAG1_HASMNF) { 1113 /* 1114 * Setup MNF stuffs. 1115 */ 1116 chan->ch_flags |= VMBUS_CHAN_FLAG_HASMNF; 1117 chan->ch_montrig_idx = offer->chm_montrig / VMBUS_MONTRIG_LEN; 1118 if (chan->ch_montrig_idx >= VMBUS_MONTRIGS_MAX) 1119 panic("invalid monitor trigger %u", offer->chm_montrig); 1120 chan->ch_montrig_mask = 1121 1 << (offer->chm_montrig % VMBUS_MONTRIG_LEN); 1122 } 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 hv_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 hv_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->vmbus_sc; 1188 struct hv_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 hv_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 hv_vmbus_channel *) * VMBUS_CHAN_MAX); 1253 mtx_unlock(&sc->vmbus_prichan_lock); 1254} 1255 1256/** 1257 * @brief Select the best outgoing channel 1258 * 1259 * The channel whose vcpu binding is closest to the currect vcpu will 1260 * be selected. 1261 * If no multi-channel, always select primary channel 1262 * 1263 * @param primary - primary channel 1264 */ 1265struct hv_vmbus_channel * 1266vmbus_select_outgoing_channel(struct hv_vmbus_channel *primary) 1267{ 1268 hv_vmbus_channel *new_channel = NULL; 1269 hv_vmbus_channel *outgoing_channel = primary; 1270 int old_cpu_distance = 0; 1271 int new_cpu_distance = 0; 1272 int cur_vcpu = 0; 1273 int smp_pro_id = PCPU_GET(cpuid); 1274 1275 if (TAILQ_EMPTY(&primary->ch_subchans)) { 1276 return outgoing_channel; 1277 } 1278 1279 if (smp_pro_id >= MAXCPU) { 1280 return outgoing_channel; 1281 } 1282 1283 cur_vcpu = VMBUS_PCPU_GET(primary->vmbus_sc, vcpuid, smp_pro_id); 1284 1285 /* XXX need lock */ 1286 TAILQ_FOREACH(new_channel, &primary->ch_subchans, ch_sublink) { 1287 if ((new_channel->ch_stflags & VMBUS_CHAN_ST_OPENED) == 0) { 1288 continue; 1289 } 1290 1291 if (new_channel->ch_vcpuid == cur_vcpu){ 1292 return new_channel; 1293 } 1294 1295 old_cpu_distance = ((outgoing_channel->ch_vcpuid > cur_vcpu) ? 1296 (outgoing_channel->ch_vcpuid - cur_vcpu) : 1297 (cur_vcpu - outgoing_channel->ch_vcpuid)); 1298 1299 new_cpu_distance = ((new_channel->ch_vcpuid > cur_vcpu) ? 1300 (new_channel->ch_vcpuid - cur_vcpu) : 1301 (cur_vcpu - new_channel->ch_vcpuid)); 1302 1303 if (old_cpu_distance < new_cpu_distance) { 1304 continue; 1305 } 1306 1307 outgoing_channel = new_channel; 1308 } 1309 1310 return(outgoing_channel); 1311} 1312 1313struct hv_vmbus_channel ** 1314vmbus_subchan_get(struct hv_vmbus_channel *pri_chan, int subchan_cnt) 1315{ 1316 struct hv_vmbus_channel **ret, *chan; 1317 int i; 1318 1319 ret = malloc(subchan_cnt * sizeof(struct hv_vmbus_channel *), M_TEMP, 1320 M_WAITOK); 1321 1322 mtx_lock(&pri_chan->ch_subchan_lock); 1323 1324 while (pri_chan->ch_subchan_cnt < subchan_cnt) 1325 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "subch", 0); 1326 1327 i = 0; 1328 TAILQ_FOREACH(chan, &pri_chan->ch_subchans, ch_sublink) { 1329 /* TODO: refcnt chan */ 1330 ret[i] = chan; 1331 1332 ++i; 1333 if (i == subchan_cnt) 1334 break; 1335 } 1336 KASSERT(i == subchan_cnt, ("invalid subchan count %d, should be %d", 1337 pri_chan->ch_subchan_cnt, subchan_cnt)); 1338 1339 mtx_unlock(&pri_chan->ch_subchan_lock); 1340 1341 return ret; 1342} 1343 1344void 1345vmbus_subchan_rel(struct hv_vmbus_channel **subchan, int subchan_cnt __unused) 1346{ 1347 1348 free(subchan, M_TEMP); 1349} 1350 1351void 1352vmbus_subchan_drain(struct hv_vmbus_channel *pri_chan) 1353{ 1354 mtx_lock(&pri_chan->ch_subchan_lock); 1355 while (pri_chan->ch_subchan_cnt > 0) 1356 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "dsubch", 0); 1357 mtx_unlock(&pri_chan->ch_subchan_lock); 1358} 1359 1360void 1361vmbus_chan_msgproc(struct vmbus_softc *sc, const struct vmbus_message *msg) 1362{ 1363 vmbus_chanmsg_proc_t msg_proc; 1364 uint32_t msg_type; 1365 1366 msg_type = ((const struct vmbus_chanmsg_hdr *)msg->msg_data)->chm_type; 1367 KASSERT(msg_type < VMBUS_CHANMSG_TYPE_MAX, 1368 ("invalid message type %u", msg_type)); 1369 1370 msg_proc = vmbus_chan_msgprocs[msg_type]; 1371 if (msg_proc != NULL) 1372 msg_proc(sc, msg); 1373} 1374