vmbus_chan.c revision 302885
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 302885 2016-07-15 07:45:30Z 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 hv_vmbus_channel_teardown_gpdal(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} 339 340/** 341 * @brief Establish a GPADL for the specified buffer 342 */ 343int 344hv_vmbus_channel_establish_gpadl(struct hv_vmbus_channel *channel, 345 void *contig_buffer, uint32_t size, uint32_t *gpadl) 346{ 347 return vmbus_chan_gpadl_connect(channel, 348 hv_get_phys_addr(contig_buffer), size, gpadl); 349} 350 351int 352vmbus_chan_gpadl_connect(struct hv_vmbus_channel *chan, bus_addr_t paddr, 353 int size, uint32_t *gpadl0) 354{ 355 struct vmbus_softc *sc = chan->vmbus_sc; 356 struct vmbus_msghc *mh; 357 struct vmbus_chanmsg_gpadl_conn *req; 358 const struct vmbus_message *msg; 359 size_t reqsz; 360 uint32_t gpadl, status; 361 int page_count, range_len, i, cnt, error; 362 uint64_t page_id; 363 364 /* 365 * Preliminary checks. 366 */ 367 368 KASSERT((size & PAGE_MASK) == 0, 369 ("invalid GPA size %d, not multiple page size", size)); 370 page_count = size >> PAGE_SHIFT; 371 372 KASSERT((paddr & PAGE_MASK) == 0, 373 ("GPA is not page aligned %jx", (uintmax_t)paddr)); 374 page_id = paddr >> PAGE_SHIFT; 375 376 range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); 377 /* 378 * We don't support multiple GPA ranges. 379 */ 380 if (range_len > UINT16_MAX) { 381 device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", 382 page_count); 383 return EOPNOTSUPP; 384 } 385 386 /* 387 * Allocate GPADL id. 388 */ 389 gpadl = vmbus_gpadl_alloc(sc); 390 *gpadl0 = gpadl; 391 392 /* 393 * Connect this GPADL to the target channel. 394 * 395 * NOTE: 396 * Since each message can only hold small set of page 397 * addresses, several messages may be required to 398 * complete the connection. 399 */ 400 if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) 401 cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; 402 else 403 cnt = page_count; 404 page_count -= cnt; 405 406 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, 407 chm_range.gpa_page[cnt]); 408 mh = vmbus_msghc_get(sc, reqsz); 409 if (mh == NULL) { 410 device_printf(sc->vmbus_dev, 411 "can not get msg hypercall for gpadl->chan%u\n", 412 chan->ch_id); 413 return EIO; 414 } 415 416 req = vmbus_msghc_dataptr(mh); 417 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN; 418 req->chm_chanid = chan->ch_id; 419 req->chm_gpadl = gpadl; 420 req->chm_range_len = range_len; 421 req->chm_range_cnt = 1; 422 req->chm_range.gpa_len = size; 423 req->chm_range.gpa_ofs = 0; 424 for (i = 0; i < cnt; ++i) 425 req->chm_range.gpa_page[i] = page_id++; 426 427 error = vmbus_msghc_exec(sc, mh); 428 if (error) { 429 device_printf(sc->vmbus_dev, 430 "gpadl->chan%u msg hypercall exec failed: %d\n", 431 chan->ch_id, error); 432 vmbus_msghc_put(sc, mh); 433 return error; 434 } 435 436 while (page_count > 0) { 437 struct vmbus_chanmsg_gpadl_subconn *subreq; 438 439 if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) 440 cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; 441 else 442 cnt = page_count; 443 page_count -= cnt; 444 445 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, 446 chm_gpa_page[cnt]); 447 vmbus_msghc_reset(mh, reqsz); 448 449 subreq = vmbus_msghc_dataptr(mh); 450 subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN; 451 subreq->chm_gpadl = gpadl; 452 for (i = 0; i < cnt; ++i) 453 subreq->chm_gpa_page[i] = page_id++; 454 455 vmbus_msghc_exec_noresult(mh); 456 } 457 KASSERT(page_count == 0, ("invalid page count %d", page_count)); 458 459 msg = vmbus_msghc_wait_result(sc, mh); 460 status = ((const struct vmbus_chanmsg_gpadl_connresp *) 461 msg->msg_data)->chm_status; 462 463 vmbus_msghc_put(sc, mh); 464 465 if (status != 0) { 466 device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " 467 "status %u\n", chan->ch_id, status); 468 return EIO; 469 } else { 470 if (bootverbose) { 471 device_printf(sc->vmbus_dev, "gpadl->chan%u " 472 "succeeded\n", chan->ch_id); 473 } 474 } 475 return 0; 476} 477 478/* 479 * Disconnect the GPA from the target channel 480 */ 481int 482hv_vmbus_channel_teardown_gpdal(struct hv_vmbus_channel *chan, uint32_t gpadl) 483{ 484 struct vmbus_softc *sc = chan->vmbus_sc; 485 struct vmbus_msghc *mh; 486 struct vmbus_chanmsg_gpadl_disconn *req; 487 int error; 488 489 mh = vmbus_msghc_get(sc, sizeof(*req)); 490 if (mh == NULL) { 491 device_printf(sc->vmbus_dev, 492 "can not get msg hypercall for gpa x->chan%u\n", 493 chan->ch_id); 494 return EBUSY; 495 } 496 497 req = vmbus_msghc_dataptr(mh); 498 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN; 499 req->chm_chanid = chan->ch_id; 500 req->chm_gpadl = gpadl; 501 502 error = vmbus_msghc_exec(sc, mh); 503 if (error) { 504 device_printf(sc->vmbus_dev, 505 "gpa x->chan%u msg hypercall exec failed: %d\n", 506 chan->ch_id, error); 507 vmbus_msghc_put(sc, mh); 508 return error; 509 } 510 511 vmbus_msghc_wait_result(sc, mh); 512 /* Discard result; no useful information */ 513 vmbus_msghc_put(sc, mh); 514 515 return 0; 516} 517 518static void 519hv_vmbus_channel_close_internal(hv_vmbus_channel *channel) 520{ 521 struct vmbus_softc *sc = channel->vmbus_sc; 522 struct vmbus_msghc *mh; 523 struct vmbus_chanmsg_chclose *req; 524 struct taskqueue *tq = channel->ch_tq; 525 int error; 526 527 /* TODO: stringent check */ 528 atomic_clear_int(&channel->ch_stflags, VMBUS_CHAN_ST_OPENED); 529 530 sysctl_ctx_free(&channel->ch_sysctl_ctx); 531 532 /* 533 * Set ch_tq to NULL to avoid more requests be scheduled 534 */ 535 channel->ch_tq = NULL; 536 taskqueue_drain(tq, &channel->ch_task); 537 channel->ch_cb = NULL; 538 539 /** 540 * Send a closing message 541 */ 542 543 mh = vmbus_msghc_get(sc, sizeof(*req)); 544 if (mh == NULL) { 545 device_printf(sc->vmbus_dev, 546 "can not get msg hypercall for chclose(chan%u)\n", 547 channel->ch_id); 548 return; 549 } 550 551 req = vmbus_msghc_dataptr(mh); 552 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; 553 req->chm_chanid = channel->ch_id; 554 555 error = vmbus_msghc_exec_noresult(mh); 556 vmbus_msghc_put(sc, mh); 557 558 if (error) { 559 device_printf(sc->vmbus_dev, 560 "chclose(chan%u) msg hypercall exec failed: %d\n", 561 channel->ch_id, error); 562 return; 563 } else if (bootverbose) { 564 device_printf(sc->vmbus_dev, "close chan%u\n", 565 channel->ch_id); 566 } 567 568 /* Tear down the gpadl for the channel's ring buffer */ 569 if (channel->ch_bufring_gpadl) { 570 hv_vmbus_channel_teardown_gpdal(channel, 571 channel->ch_bufring_gpadl); 572 channel->ch_bufring_gpadl = 0; 573 } 574 575 /* TODO: Send a msg to release the childRelId */ 576 577 /* cleanup the ring buffers for this channel */ 578 hv_ring_buffer_cleanup(&channel->outbound); 579 hv_ring_buffer_cleanup(&channel->inbound); 580 581 if (channel->ch_bufring != NULL) { 582 hyperv_dmamem_free(&channel->ch_bufring_dma, 583 channel->ch_bufring); 584 channel->ch_bufring = NULL; 585 } 586} 587 588/* 589 * Caller should make sure that all sub-channels have 590 * been added to 'chan' and all to-be-closed channels 591 * are not being opened. 592 */ 593void 594hv_vmbus_channel_close(struct hv_vmbus_channel *chan) 595{ 596 int subchan_cnt; 597 598 if (!VMBUS_CHAN_ISPRIMARY(chan)) { 599 /* 600 * Sub-channel is closed when its primary channel 601 * is closed; done. 602 */ 603 return; 604 } 605 606 /* 607 * Close all sub-channels, if any. 608 */ 609 subchan_cnt = chan->ch_subchan_cnt; 610 if (subchan_cnt > 0) { 611 struct hv_vmbus_channel **subchan; 612 int i; 613 614 subchan = vmbus_get_subchan(chan, subchan_cnt); 615 for (i = 0; i < subchan_cnt; ++i) 616 hv_vmbus_channel_close_internal(subchan[i]); 617 vmbus_rel_subchan(subchan, subchan_cnt); 618 } 619 620 /* Then close the primary channel. */ 621 hv_vmbus_channel_close_internal(chan); 622} 623 624int 625vmbus_chan_send(struct hv_vmbus_channel *chan, uint16_t type, uint16_t flags, 626 void *data, int dlen, uint64_t xactid) 627{ 628 struct vmbus_chanpkt pkt; 629 int pktlen, pad_pktlen, hlen, error; 630 uint64_t pad = 0; 631 struct iovec iov[3]; 632 boolean_t send_evt; 633 634 hlen = sizeof(pkt); 635 pktlen = hlen + dlen; 636 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 637 638 pkt.cp_hdr.cph_type = type; 639 pkt.cp_hdr.cph_flags = flags; 640 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 641 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 642 pkt.cp_hdr.cph_xactid = xactid; 643 644 iov[0].iov_base = &pkt; 645 iov[0].iov_len = hlen; 646 iov[1].iov_base = data; 647 iov[1].iov_len = dlen; 648 iov[2].iov_base = &pad; 649 iov[2].iov_len = pad_pktlen - pktlen; 650 651 error = hv_ring_buffer_write(&chan->outbound, iov, 3, &send_evt); 652 if (!error && send_evt) 653 vmbus_chan_send_event(chan); 654 return error; 655} 656 657int 658vmbus_chan_send_sglist(struct hv_vmbus_channel *chan, 659 struct vmbus_gpa sg[], int sglen, void *data, int dlen, uint64_t xactid) 660{ 661 struct vmbus_chanpkt_sglist pkt; 662 int pktlen, pad_pktlen, hlen, error; 663 struct iovec iov[4]; 664 boolean_t send_evt; 665 uint64_t pad = 0; 666 667 KASSERT(sglen < VMBUS_CHAN_SGLIST_MAX, 668 ("invalid sglist len %d", sglen)); 669 670 hlen = __offsetof(struct vmbus_chanpkt_sglist, cp_gpa[sglen]); 671 pktlen = hlen + dlen; 672 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 673 674 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; 675 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; 676 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 677 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 678 pkt.cp_hdr.cph_xactid = xactid; 679 pkt.cp_rsvd = 0; 680 pkt.cp_gpa_cnt = sglen; 681 682 iov[0].iov_base = &pkt; 683 iov[0].iov_len = sizeof(pkt); 684 iov[1].iov_base = sg; 685 iov[1].iov_len = sizeof(struct vmbus_gpa) * sglen; 686 iov[2].iov_base = data; 687 iov[2].iov_len = dlen; 688 iov[3].iov_base = &pad; 689 iov[3].iov_len = pad_pktlen - pktlen; 690 691 error = hv_ring_buffer_write(&chan->outbound, iov, 4, &send_evt); 692 if (!error && send_evt) 693 vmbus_chan_send_event(chan); 694 return error; 695} 696 697int 698vmbus_chan_send_prplist(struct hv_vmbus_channel *chan, 699 struct vmbus_gpa_range *prp, int prp_cnt, void *data, int dlen, 700 uint64_t xactid) 701{ 702 struct vmbus_chanpkt_prplist pkt; 703 int pktlen, pad_pktlen, hlen, error; 704 struct iovec iov[4]; 705 boolean_t send_evt; 706 uint64_t pad = 0; 707 708 KASSERT(prp_cnt < VMBUS_CHAN_PRPLIST_MAX, 709 ("invalid prplist entry count %d", prp_cnt)); 710 711 hlen = __offsetof(struct vmbus_chanpkt_prplist, 712 cp_range[0].gpa_page[prp_cnt]); 713 pktlen = hlen + dlen; 714 pad_pktlen = VMBUS_CHANPKT_TOTLEN(pktlen); 715 716 pkt.cp_hdr.cph_type = VMBUS_CHANPKT_TYPE_GPA; 717 pkt.cp_hdr.cph_flags = VMBUS_CHANPKT_FLAG_RC; 718 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_hlen, hlen); 719 VMBUS_CHANPKT_SETLEN(pkt.cp_hdr.cph_tlen, pad_pktlen); 720 pkt.cp_hdr.cph_xactid = xactid; 721 pkt.cp_rsvd = 0; 722 pkt.cp_range_cnt = 1; 723 724 iov[0].iov_base = &pkt; 725 iov[0].iov_len = sizeof(pkt); 726 iov[1].iov_base = prp; 727 iov[1].iov_len = __offsetof(struct vmbus_gpa_range, gpa_page[prp_cnt]); 728 iov[2].iov_base = data; 729 iov[2].iov_len = dlen; 730 iov[3].iov_base = &pad; 731 iov[3].iov_len = pad_pktlen - pktlen; 732 733 error = hv_ring_buffer_write(&chan->outbound, iov, 4, &send_evt); 734 if (!error && send_evt) 735 vmbus_chan_send_event(chan); 736 return error; 737} 738 739int 740vmbus_chan_recv(struct hv_vmbus_channel *chan, void *data, int *dlen0, 741 uint64_t *xactid) 742{ 743 struct vmbus_chanpkt_hdr pkt; 744 int error, dlen, hlen; 745 746 error = hv_ring_buffer_peek(&chan->inbound, &pkt, sizeof(pkt)); 747 if (error) 748 return error; 749 750 hlen = VMBUS_CHANPKT_GETLEN(pkt.cph_hlen); 751 dlen = VMBUS_CHANPKT_GETLEN(pkt.cph_tlen) - hlen; 752 753 if (*dlen0 < dlen) { 754 /* Return the size of this packet. */ 755 *dlen0 = dlen; 756 return ENOBUFS; 757 } 758 759 *xactid = pkt.cph_xactid; 760 *dlen0 = dlen; 761 762 error = hv_ring_buffer_read(&chan->inbound, data, dlen, hlen); 763 KASSERT(!error, ("hv_ring_buffer_read failed")); 764 765 return 0; 766} 767 768/** 769 * @brief Retrieve the raw packet on the specified channel 770 */ 771int 772hv_vmbus_channel_recv_packet_raw( 773 hv_vmbus_channel* channel, 774 void* buffer, 775 uint32_t buffer_len, 776 uint32_t* buffer_actual_len, 777 uint64_t* request_id) 778{ 779 int ret; 780 uint32_t packetLen; 781 hv_vm_packet_descriptor desc; 782 783 *buffer_actual_len = 0; 784 *request_id = 0; 785 786 ret = hv_ring_buffer_peek( 787 &channel->inbound, &desc, 788 sizeof(hv_vm_packet_descriptor)); 789 790 if (ret != 0) 791 return (0); 792 793 packetLen = desc.length8 << 3; 794 *buffer_actual_len = packetLen; 795 796 if (packetLen > buffer_len) 797 return (ENOBUFS); 798 799 *request_id = desc.transaction_id; 800 801 /* Copy over the entire packet to the user buffer */ 802 ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0); 803 804 return (0); 805} 806 807static void 808vmbus_chan_task(void *xchan, int pending __unused) 809{ 810 struct hv_vmbus_channel *chan = xchan; 811 vmbus_chan_callback_t cb = chan->ch_cb; 812 void *cbarg = chan->ch_cbarg; 813 814 /* 815 * Optimize host to guest signaling by ensuring: 816 * 1. While reading the channel, we disable interrupts from 817 * host. 818 * 2. Ensure that we process all posted messages from the host 819 * before returning from this callback. 820 * 3. Once we return, enable signaling from the host. Once this 821 * state is set we check to see if additional packets are 822 * available to read. In this case we repeat the process. 823 * 824 * NOTE: Interrupt has been disabled in the ISR. 825 */ 826 for (;;) { 827 uint32_t left; 828 829 cb(cbarg); 830 831 left = hv_ring_buffer_read_end(&chan->inbound); 832 if (left == 0) { 833 /* No more data in RX bufring; done */ 834 break; 835 } 836 hv_ring_buffer_read_begin(&chan->inbound); 837 } 838} 839 840static void 841vmbus_chan_task_nobatch(void *xchan, int pending __unused) 842{ 843 struct hv_vmbus_channel *chan = xchan; 844 845 chan->ch_cb(chan->ch_cbarg); 846} 847 848static __inline void 849vmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags, 850 int flag_cnt) 851{ 852 int f; 853 854 for (f = 0; f < flag_cnt; ++f) { 855 uint32_t chid_base; 856 u_long flags; 857 int chid_ofs; 858 859 if (event_flags[f] == 0) 860 continue; 861 862 flags = atomic_swap_long(&event_flags[f], 0); 863 chid_base = f << VMBUS_EVTFLAG_SHIFT; 864 865 while ((chid_ofs = ffsl(flags)) != 0) { 866 struct hv_vmbus_channel *channel; 867 868 --chid_ofs; /* NOTE: ffsl is 1-based */ 869 flags &= ~(1UL << chid_ofs); 870 871 channel = sc->vmbus_chmap[chid_base + chid_ofs]; 872 873 /* if channel is closed or closing */ 874 if (channel == NULL || channel->ch_tq == NULL) 875 continue; 876 877 if (channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) 878 hv_ring_buffer_read_begin(&channel->inbound); 879 taskqueue_enqueue(channel->ch_tq, &channel->ch_task); 880 } 881 } 882} 883 884void 885vmbus_event_proc(struct vmbus_softc *sc, int cpu) 886{ 887 struct vmbus_evtflags *eventf; 888 889 /* 890 * On Host with Win8 or above, the event page can be checked directly 891 * to get the id of the channel that has the pending interrupt. 892 */ 893 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 894 vmbus_event_flags_proc(sc, eventf->evt_flags, 895 VMBUS_PCPU_GET(sc, event_flags_cnt, cpu)); 896} 897 898void 899vmbus_event_proc_compat(struct vmbus_softc *sc, int cpu) 900{ 901 struct vmbus_evtflags *eventf; 902 903 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 904 if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) { 905 vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags, 906 VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT); 907 } 908} 909 910static void 911vmbus_chan_update_evtflagcnt(struct vmbus_softc *sc, 912 const struct hv_vmbus_channel *chan) 913{ 914 volatile int *flag_cnt_ptr; 915 int flag_cnt; 916 917 flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1; 918 flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->ch_cpuid); 919 920 for (;;) { 921 int old_flag_cnt; 922 923 old_flag_cnt = *flag_cnt_ptr; 924 if (old_flag_cnt >= flag_cnt) 925 break; 926 if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) { 927 if (bootverbose) { 928 device_printf(sc->vmbus_dev, 929 "channel%u update cpu%d flag_cnt to %d\n", 930 chan->ch_id, chan->ch_cpuid, flag_cnt); 931 } 932 break; 933 } 934 } 935} 936 937static struct hv_vmbus_channel * 938vmbus_chan_alloc(struct vmbus_softc *sc) 939{ 940 struct hv_vmbus_channel *chan; 941 942 chan = malloc(sizeof(*chan), M_DEVBUF, M_WAITOK | M_ZERO); 943 944 chan->ch_monprm = hyperv_dmamem_alloc(bus_get_dma_tag(sc->vmbus_dev), 945 HYPERCALL_PARAM_ALIGN, 0, sizeof(struct hyperv_mon_param), 946 &chan->ch_monprm_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); 947 if (chan->ch_monprm == NULL) { 948 device_printf(sc->vmbus_dev, "monprm alloc failed\n"); 949 free(chan, M_DEVBUF); 950 return NULL; 951 } 952 953 chan->vmbus_sc = sc; 954 mtx_init(&chan->ch_subchan_lock, "vmbus subchan", NULL, MTX_DEF); 955 TAILQ_INIT(&chan->ch_subchans); 956 TASK_INIT(&chan->ch_detach_task, 0, vmbus_chan_detach_task, chan); 957 958 return chan; 959} 960 961static void 962vmbus_chan_free(struct hv_vmbus_channel *chan) 963{ 964 /* TODO: assert sub-channel list is empty */ 965 /* TODO: asset no longer on the primary channel's sub-channel list */ 966 /* TODO: asset no longer on the vmbus channel list */ 967 hyperv_dmamem_free(&chan->ch_monprm_dma, chan->ch_monprm); 968 mtx_destroy(&chan->ch_subchan_lock); 969 free(chan, M_DEVBUF); 970} 971 972static int 973vmbus_chan_add(struct hv_vmbus_channel *newchan) 974{ 975 struct vmbus_softc *sc = newchan->vmbus_sc; 976 struct hv_vmbus_channel *prichan; 977 978 if (newchan->ch_id == 0) { 979 /* 980 * XXX 981 * Chan0 will neither be processed nor should be offered; 982 * skip it. 983 */ 984 device_printf(sc->vmbus_dev, "got chan0 offer, discard\n"); 985 return EINVAL; 986 } else if (newchan->ch_id >= VMBUS_CHAN_MAX) { 987 device_printf(sc->vmbus_dev, "invalid chan%u offer\n", 988 newchan->ch_id); 989 return EINVAL; 990 } 991 sc->vmbus_chmap[newchan->ch_id] = newchan; 992 993 if (bootverbose) { 994 device_printf(sc->vmbus_dev, "chan%u subidx%u offer\n", 995 newchan->ch_id, newchan->ch_subidx); 996 } 997 998 mtx_lock(&sc->vmbus_prichan_lock); 999 TAILQ_FOREACH(prichan, &sc->vmbus_prichans, ch_prilink) { 1000 /* 1001 * Sub-channel will have the same type GUID and instance 1002 * GUID as its primary channel. 1003 */ 1004 if (memcmp(&prichan->ch_guid_type, &newchan->ch_guid_type, 1005 sizeof(struct hyperv_guid)) == 0 && 1006 memcmp(&prichan->ch_guid_inst, &newchan->ch_guid_inst, 1007 sizeof(struct hyperv_guid)) == 0) 1008 break; 1009 } 1010 if (VMBUS_CHAN_ISPRIMARY(newchan)) { 1011 if (prichan == NULL) { 1012 /* Install the new primary channel */ 1013 TAILQ_INSERT_TAIL(&sc->vmbus_prichans, newchan, 1014 ch_prilink); 1015 mtx_unlock(&sc->vmbus_prichan_lock); 1016 return 0; 1017 } else { 1018 mtx_unlock(&sc->vmbus_prichan_lock); 1019 device_printf(sc->vmbus_dev, "duplicated primary " 1020 "chan%u\n", newchan->ch_id); 1021 return EINVAL; 1022 } 1023 } else { /* Sub-channel */ 1024 if (prichan == NULL) { 1025 mtx_unlock(&sc->vmbus_prichan_lock); 1026 device_printf(sc->vmbus_dev, "no primary chan for " 1027 "chan%u\n", newchan->ch_id); 1028 return EINVAL; 1029 } 1030 /* 1031 * Found the primary channel for this sub-channel and 1032 * move on. 1033 * 1034 * XXX refcnt prichan 1035 */ 1036 } 1037 mtx_unlock(&sc->vmbus_prichan_lock); 1038 1039 /* 1040 * This is a sub-channel; link it with the primary channel. 1041 */ 1042 KASSERT(!VMBUS_CHAN_ISPRIMARY(newchan), 1043 ("new channel is not sub-channel")); 1044 KASSERT(prichan != NULL, ("no primary channel")); 1045 1046 newchan->ch_prichan = prichan; 1047 newchan->ch_dev = prichan->ch_dev; 1048 1049 mtx_lock(&prichan->ch_subchan_lock); 1050 TAILQ_INSERT_TAIL(&prichan->ch_subchans, newchan, ch_sublink); 1051 /* 1052 * Bump up sub-channel count and notify anyone that is 1053 * interested in this sub-channel, after this sub-channel 1054 * is setup. 1055 */ 1056 prichan->ch_subchan_cnt++; 1057 mtx_unlock(&prichan->ch_subchan_lock); 1058 wakeup(prichan); 1059 1060 return 0; 1061} 1062 1063void 1064vmbus_channel_cpu_set(struct hv_vmbus_channel *chan, int cpu) 1065{ 1066 KASSERT(cpu >= 0 && cpu < mp_ncpus, ("invalid cpu %d", cpu)); 1067 1068 if (chan->vmbus_sc->vmbus_version == VMBUS_VERSION_WS2008 || 1069 chan->vmbus_sc->vmbus_version == VMBUS_VERSION_WIN7) { 1070 /* Only cpu0 is supported */ 1071 cpu = 0; 1072 } 1073 1074 chan->ch_cpuid = cpu; 1075 chan->ch_vcpuid = VMBUS_PCPU_GET(chan->vmbus_sc, vcpuid, cpu); 1076 1077 if (bootverbose) { 1078 printf("vmbus_chan%u: assigned to cpu%u [vcpu%u]\n", 1079 chan->ch_id, chan->ch_cpuid, chan->ch_vcpuid); 1080 } 1081} 1082 1083void 1084vmbus_channel_cpu_rr(struct hv_vmbus_channel *chan) 1085{ 1086 static uint32_t vmbus_chan_nextcpu; 1087 int cpu; 1088 1089 cpu = atomic_fetchadd_int(&vmbus_chan_nextcpu, 1) % mp_ncpus; 1090 vmbus_channel_cpu_set(chan, cpu); 1091} 1092 1093static void 1094vmbus_chan_cpu_default(struct hv_vmbus_channel *chan) 1095{ 1096 /* 1097 * By default, pin the channel to cpu0. Devices having 1098 * special channel-cpu mapping requirement should call 1099 * vmbus_channel_cpu_{set,rr}(). 1100 */ 1101 vmbus_channel_cpu_set(chan, 0); 1102} 1103 1104static void 1105vmbus_chan_msgproc_choffer(struct vmbus_softc *sc, 1106 const struct vmbus_message *msg) 1107{ 1108 const struct vmbus_chanmsg_choffer *offer; 1109 struct hv_vmbus_channel *chan; 1110 int error; 1111 1112 offer = (const struct vmbus_chanmsg_choffer *)msg->msg_data; 1113 1114 chan = vmbus_chan_alloc(sc); 1115 if (chan == NULL) { 1116 device_printf(sc->vmbus_dev, "allocate chan%u failed\n", 1117 offer->chm_chanid); 1118 return; 1119 } 1120 1121 chan->ch_id = offer->chm_chanid; 1122 chan->ch_subidx = offer->chm_subidx; 1123 chan->ch_guid_type = offer->chm_chtype; 1124 chan->ch_guid_inst = offer->chm_chinst; 1125 1126 /* Batch reading is on by default */ 1127 chan->ch_flags |= VMBUS_CHAN_FLAG_BATCHREAD; 1128 1129 chan->ch_monprm->mp_connid = VMBUS_CONNID_EVENT; 1130 if (sc->vmbus_version != VMBUS_VERSION_WS2008) 1131 chan->ch_monprm->mp_connid = offer->chm_connid; 1132 1133 if (offer->chm_flags1 & VMBUS_CHOFFER_FLAG1_HASMNF) { 1134 /* 1135 * Setup MNF stuffs. 1136 */ 1137 chan->ch_flags |= VMBUS_CHAN_FLAG_HASMNF; 1138 chan->ch_montrig_idx = offer->chm_montrig / VMBUS_MONTRIG_LEN; 1139 if (chan->ch_montrig_idx >= VMBUS_MONTRIGS_MAX) 1140 panic("invalid monitor trigger %u", offer->chm_montrig); 1141 chan->ch_montrig_mask = 1142 1 << (offer->chm_montrig % VMBUS_MONTRIG_LEN); 1143 } 1144 1145 /* Select default cpu for this channel. */ 1146 vmbus_chan_cpu_default(chan); 1147 1148 error = vmbus_chan_add(chan); 1149 if (error) { 1150 device_printf(sc->vmbus_dev, "add chan%u failed: %d\n", 1151 chan->ch_id, error); 1152 vmbus_chan_free(chan); 1153 return; 1154 } 1155 1156 if (VMBUS_CHAN_ISPRIMARY(chan)) { 1157 /* 1158 * Add device for this primary channel. 1159 * 1160 * NOTE: 1161 * Error is ignored here; don't have much to do if error 1162 * really happens. 1163 */ 1164 vmbus_add_child(chan); 1165 } 1166} 1167 1168/* 1169 * XXX pretty broken; need rework. 1170 */ 1171static void 1172vmbus_chan_msgproc_chrescind(struct vmbus_softc *sc, 1173 const struct vmbus_message *msg) 1174{ 1175 const struct vmbus_chanmsg_chrescind *note; 1176 struct hv_vmbus_channel *chan; 1177 1178 note = (const struct vmbus_chanmsg_chrescind *)msg->msg_data; 1179 if (note->chm_chanid > VMBUS_CHAN_MAX) { 1180 device_printf(sc->vmbus_dev, "invalid rescinded chan%u\n", 1181 note->chm_chanid); 1182 return; 1183 } 1184 1185 if (bootverbose) { 1186 device_printf(sc->vmbus_dev, "chan%u rescinded\n", 1187 note->chm_chanid); 1188 } 1189 1190 chan = sc->vmbus_chmap[note->chm_chanid]; 1191 if (chan == NULL) 1192 return; 1193 sc->vmbus_chmap[note->chm_chanid] = NULL; 1194 1195 taskqueue_enqueue(taskqueue_thread, &chan->ch_detach_task); 1196} 1197 1198static void 1199vmbus_chan_detach_task(void *xchan, int pending __unused) 1200{ 1201 struct hv_vmbus_channel *chan = xchan; 1202 1203 if (VMBUS_CHAN_ISPRIMARY(chan)) { 1204 /* Only primary channel owns the device */ 1205 vmbus_delete_child(chan); 1206 /* NOTE: DO NOT free primary channel for now */ 1207 } else { 1208 struct vmbus_softc *sc = chan->vmbus_sc; 1209 struct hv_vmbus_channel *pri_chan = chan->ch_prichan; 1210 struct vmbus_chanmsg_chfree *req; 1211 struct vmbus_msghc *mh; 1212 int error; 1213 1214 mh = vmbus_msghc_get(sc, sizeof(*req)); 1215 if (mh == NULL) { 1216 device_printf(sc->vmbus_dev, 1217 "can not get msg hypercall for chfree(chan%u)\n", 1218 chan->ch_id); 1219 goto remove; 1220 } 1221 1222 req = vmbus_msghc_dataptr(mh); 1223 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHFREE; 1224 req->chm_chanid = chan->ch_id; 1225 1226 error = vmbus_msghc_exec_noresult(mh); 1227 vmbus_msghc_put(sc, mh); 1228 1229 if (error) { 1230 device_printf(sc->vmbus_dev, 1231 "chfree(chan%u) failed: %d", 1232 chan->ch_id, error); 1233 /* NOTE: Move on! */ 1234 } else { 1235 if (bootverbose) { 1236 device_printf(sc->vmbus_dev, "chan%u freed\n", 1237 chan->ch_id); 1238 } 1239 } 1240remove: 1241 mtx_lock(&pri_chan->ch_subchan_lock); 1242 TAILQ_REMOVE(&pri_chan->ch_subchans, chan, ch_sublink); 1243 KASSERT(pri_chan->ch_subchan_cnt > 0, 1244 ("invalid subchan_cnt %d", pri_chan->ch_subchan_cnt)); 1245 pri_chan->ch_subchan_cnt--; 1246 mtx_unlock(&pri_chan->ch_subchan_lock); 1247 wakeup(pri_chan); 1248 1249 vmbus_chan_free(chan); 1250 } 1251} 1252 1253/* 1254 * Detach all devices and destroy the corresponding primary channels. 1255 */ 1256void 1257vmbus_chan_destroy_all(struct vmbus_softc *sc) 1258{ 1259 struct hv_vmbus_channel *chan; 1260 1261 mtx_lock(&sc->vmbus_prichan_lock); 1262 while ((chan = TAILQ_FIRST(&sc->vmbus_prichans)) != NULL) { 1263 KASSERT(VMBUS_CHAN_ISPRIMARY(chan), ("not primary channel")); 1264 TAILQ_REMOVE(&sc->vmbus_prichans, chan, ch_prilink); 1265 mtx_unlock(&sc->vmbus_prichan_lock); 1266 1267 vmbus_delete_child(chan); 1268 vmbus_chan_free(chan); 1269 1270 mtx_lock(&sc->vmbus_prichan_lock); 1271 } 1272 bzero(sc->vmbus_chmap, 1273 sizeof(struct hv_vmbus_channel *) * VMBUS_CHAN_MAX); 1274 mtx_unlock(&sc->vmbus_prichan_lock); 1275} 1276 1277/** 1278 * @brief Select the best outgoing channel 1279 * 1280 * The channel whose vcpu binding is closest to the currect vcpu will 1281 * be selected. 1282 * If no multi-channel, always select primary channel 1283 * 1284 * @param primary - primary channel 1285 */ 1286struct hv_vmbus_channel * 1287vmbus_select_outgoing_channel(struct hv_vmbus_channel *primary) 1288{ 1289 hv_vmbus_channel *new_channel = NULL; 1290 hv_vmbus_channel *outgoing_channel = primary; 1291 int old_cpu_distance = 0; 1292 int new_cpu_distance = 0; 1293 int cur_vcpu = 0; 1294 int smp_pro_id = PCPU_GET(cpuid); 1295 1296 if (TAILQ_EMPTY(&primary->ch_subchans)) { 1297 return outgoing_channel; 1298 } 1299 1300 if (smp_pro_id >= MAXCPU) { 1301 return outgoing_channel; 1302 } 1303 1304 cur_vcpu = VMBUS_PCPU_GET(primary->vmbus_sc, vcpuid, smp_pro_id); 1305 1306 /* XXX need lock */ 1307 TAILQ_FOREACH(new_channel, &primary->ch_subchans, ch_sublink) { 1308 if ((new_channel->ch_stflags & VMBUS_CHAN_ST_OPENED) == 0) { 1309 continue; 1310 } 1311 1312 if (new_channel->ch_vcpuid == cur_vcpu){ 1313 return new_channel; 1314 } 1315 1316 old_cpu_distance = ((outgoing_channel->ch_vcpuid > cur_vcpu) ? 1317 (outgoing_channel->ch_vcpuid - cur_vcpu) : 1318 (cur_vcpu - outgoing_channel->ch_vcpuid)); 1319 1320 new_cpu_distance = ((new_channel->ch_vcpuid > cur_vcpu) ? 1321 (new_channel->ch_vcpuid - cur_vcpu) : 1322 (cur_vcpu - new_channel->ch_vcpuid)); 1323 1324 if (old_cpu_distance < new_cpu_distance) { 1325 continue; 1326 } 1327 1328 outgoing_channel = new_channel; 1329 } 1330 1331 return(outgoing_channel); 1332} 1333 1334struct hv_vmbus_channel ** 1335vmbus_get_subchan(struct hv_vmbus_channel *pri_chan, int subchan_cnt) 1336{ 1337 struct hv_vmbus_channel **ret, *chan; 1338 int i; 1339 1340 ret = malloc(subchan_cnt * sizeof(struct hv_vmbus_channel *), M_TEMP, 1341 M_WAITOK); 1342 1343 mtx_lock(&pri_chan->ch_subchan_lock); 1344 1345 while (pri_chan->ch_subchan_cnt < subchan_cnt) 1346 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "subch", 0); 1347 1348 i = 0; 1349 TAILQ_FOREACH(chan, &pri_chan->ch_subchans, ch_sublink) { 1350 /* TODO: refcnt chan */ 1351 ret[i] = chan; 1352 1353 ++i; 1354 if (i == subchan_cnt) 1355 break; 1356 } 1357 KASSERT(i == subchan_cnt, ("invalid subchan count %d, should be %d", 1358 pri_chan->ch_subchan_cnt, subchan_cnt)); 1359 1360 mtx_unlock(&pri_chan->ch_subchan_lock); 1361 1362 return ret; 1363} 1364 1365void 1366vmbus_rel_subchan(struct hv_vmbus_channel **subchan, int subchan_cnt __unused) 1367{ 1368 1369 free(subchan, M_TEMP); 1370} 1371 1372void 1373vmbus_drain_subchan(struct hv_vmbus_channel *pri_chan) 1374{ 1375 mtx_lock(&pri_chan->ch_subchan_lock); 1376 while (pri_chan->ch_subchan_cnt > 0) 1377 mtx_sleep(pri_chan, &pri_chan->ch_subchan_lock, 0, "dsubch", 0); 1378 mtx_unlock(&pri_chan->ch_subchan_lock); 1379} 1380 1381void 1382vmbus_chan_msgproc(struct vmbus_softc *sc, const struct vmbus_message *msg) 1383{ 1384 vmbus_chanmsg_proc_t msg_proc; 1385 uint32_t msg_type; 1386 1387 msg_type = ((const struct vmbus_chanmsg_hdr *)msg->msg_data)->chm_type; 1388 KASSERT(msg_type < VMBUS_CHANMSG_TYPE_MAX, 1389 ("invalid message type %u", msg_type)); 1390 1391 msg_proc = vmbus_chan_msgprocs[msg_type]; 1392 if (msg_proc != NULL) 1393 msg_proc(sc, msg); 1394} 1395