vmbus_chan.c revision 302806
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 302806 2016-07-14 06:10:00Z 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/vmbus/hv_vmbus_priv.h> 49#include <dev/hyperv/vmbus/hyperv_var.h> 50#include <dev/hyperv/vmbus/vmbus_reg.h> 51#include <dev/hyperv/vmbus/vmbus_var.h> 52 53static void vmbus_chan_send_event(hv_vmbus_channel* channel); 54static void vmbus_chan_update_evtflagcnt(struct vmbus_softc *, 55 const struct hv_vmbus_channel *); 56static void vmbus_chan_task(void *, int); 57static void vmbus_chan_task_nobatch(void *, int); 58 59/** 60 * @brief Trigger an event notification on the specified channel 61 */ 62static void 63vmbus_chan_send_event(hv_vmbus_channel *channel) 64{ 65 struct vmbus_softc *sc = channel->vmbus_sc; 66 uint32_t chanid = channel->ch_id; 67 68 atomic_set_long(&sc->vmbus_tx_evtflags[chanid >> VMBUS_EVTFLAG_SHIFT], 69 1UL << (chanid & VMBUS_EVTFLAG_MASK)); 70 71 if (channel->ch_flags & VMBUS_CHAN_FLAG_HASMNF) { 72 atomic_set_int( 73 &sc->vmbus_mnf2->mnf_trigs[channel->ch_montrig_idx].mt_pending, 74 channel->ch_montrig_mask); 75 } else { 76 hypercall_signal_event(channel->ch_monprm_dma.hv_paddr); 77 } 78} 79 80static int 81vmbus_channel_sysctl_monalloc(SYSCTL_HANDLER_ARGS) 82{ 83 struct hv_vmbus_channel *chan = arg1; 84 int alloc = 0; 85 86 if (chan->ch_flags & VMBUS_CHAN_FLAG_HASMNF) 87 alloc = 1; 88 return sysctl_handle_int(oidp, &alloc, 0, req); 89} 90 91static void 92vmbus_channel_sysctl_create(hv_vmbus_channel* channel) 93{ 94 device_t dev; 95 struct sysctl_oid *devch_sysctl; 96 struct sysctl_oid *devch_id_sysctl, *devch_sub_sysctl; 97 struct sysctl_oid *devch_id_in_sysctl, *devch_id_out_sysctl; 98 struct sysctl_ctx_list *ctx; 99 uint32_t ch_id; 100 uint16_t sub_ch_id; 101 char name[16]; 102 103 hv_vmbus_channel* primary_ch = channel->primary_channel; 104 105 if (primary_ch == NULL) { 106 dev = channel->ch_dev; 107 ch_id = channel->ch_id; 108 } else { 109 dev = primary_ch->ch_dev; 110 ch_id = primary_ch->ch_id; 111 sub_ch_id = channel->ch_subidx; 112 } 113 ctx = &channel->ch_sysctl_ctx; 114 sysctl_ctx_init(ctx); 115 /* This creates dev.DEVNAME.DEVUNIT.channel tree */ 116 devch_sysctl = SYSCTL_ADD_NODE(ctx, 117 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 118 OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 119 /* This creates dev.DEVNAME.DEVUNIT.channel.CHANID tree */ 120 snprintf(name, sizeof(name), "%d", ch_id); 121 devch_id_sysctl = SYSCTL_ADD_NODE(ctx, 122 SYSCTL_CHILDREN(devch_sysctl), 123 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 124 125 if (primary_ch != NULL) { 126 devch_sub_sysctl = SYSCTL_ADD_NODE(ctx, 127 SYSCTL_CHILDREN(devch_id_sysctl), 128 OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 129 snprintf(name, sizeof(name), "%d", sub_ch_id); 130 devch_id_sysctl = SYSCTL_ADD_NODE(ctx, 131 SYSCTL_CHILDREN(devch_sub_sysctl), 132 OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 133 134 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), 135 OID_AUTO, "chanid", CTLFLAG_RD, 136 &channel->ch_id, 0, "channel id"); 137 } 138 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, 139 "cpu", CTLFLAG_RD, &channel->target_cpu, 0, "owner CPU id"); 140 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, 141 "monitor_allocated", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 142 channel, 0, vmbus_channel_sysctl_monalloc, "I", 143 "is monitor allocated to this channel"); 144 145 devch_id_in_sysctl = SYSCTL_ADD_NODE(ctx, 146 SYSCTL_CHILDREN(devch_id_sysctl), 147 OID_AUTO, 148 "in", 149 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 150 devch_id_out_sysctl = SYSCTL_ADD_NODE(ctx, 151 SYSCTL_CHILDREN(devch_id_sysctl), 152 OID_AUTO, 153 "out", 154 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 155 hv_ring_buffer_stat(ctx, 156 SYSCTL_CHILDREN(devch_id_in_sysctl), 157 &(channel->inbound), 158 "inbound ring buffer stats"); 159 hv_ring_buffer_stat(ctx, 160 SYSCTL_CHILDREN(devch_id_out_sysctl), 161 &(channel->outbound), 162 "outbound ring buffer stats"); 163} 164 165/** 166 * @brief Open the specified channel 167 */ 168int 169hv_vmbus_channel_open( 170 hv_vmbus_channel* new_channel, 171 uint32_t send_ring_buffer_size, 172 uint32_t recv_ring_buffer_size, 173 void* user_data, 174 uint32_t user_data_len, 175 hv_vmbus_pfn_channel_callback pfn_on_channel_callback, 176 void* context) 177{ 178 struct vmbus_softc *sc = new_channel->vmbus_sc; 179 const struct vmbus_chanmsg_chopen_resp *resp; 180 const struct vmbus_message *msg; 181 struct vmbus_chanmsg_chopen *req; 182 struct vmbus_msghc *mh; 183 uint32_t status; 184 int ret = 0; 185 void *in, *out; 186 187 if (user_data_len > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) { 188 device_printf(sc->vmbus_dev, 189 "invalid udata len %u for chan%u\n", 190 user_data_len, new_channel->ch_id); 191 return EINVAL; 192 } 193 194 mtx_lock(&new_channel->sc_lock); 195 if (new_channel->state == HV_CHANNEL_OPEN_STATE) { 196 new_channel->state = HV_CHANNEL_OPENING_STATE; 197 } else { 198 mtx_unlock(&new_channel->sc_lock); 199 if(bootverbose) 200 printf("VMBUS: Trying to open channel <%p> which in " 201 "%d state.\n", new_channel, new_channel->state); 202 return (EINVAL); 203 } 204 mtx_unlock(&new_channel->sc_lock); 205 206 new_channel->on_channel_callback = pfn_on_channel_callback; 207 new_channel->channel_callback_context = context; 208 209 vmbus_chan_update_evtflagcnt(sc, new_channel); 210 211 new_channel->rxq = VMBUS_PCPU_GET(new_channel->vmbus_sc, event_tq, 212 new_channel->target_cpu); 213 if (new_channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) { 214 TASK_INIT(&new_channel->channel_task, 0, 215 vmbus_chan_task, new_channel); 216 } else { 217 TASK_INIT(&new_channel->channel_task, 0, 218 vmbus_chan_task_nobatch, new_channel); 219 } 220 221 /* Allocate the ring buffer */ 222 out = contigmalloc((send_ring_buffer_size + recv_ring_buffer_size), 223 M_DEVBUF, M_ZERO, 0UL, BUS_SPACE_MAXADDR, PAGE_SIZE, 0); 224 KASSERT(out != NULL, 225 ("Error VMBUS: contigmalloc failed to allocate Ring Buffer!")); 226 if (out == NULL) 227 return (ENOMEM); 228 229 in = ((uint8_t *) out + send_ring_buffer_size); 230 231 new_channel->ring_buffer_pages = out; 232 new_channel->ring_buffer_page_count = (send_ring_buffer_size + 233 recv_ring_buffer_size) >> PAGE_SHIFT; 234 new_channel->ring_buffer_size = send_ring_buffer_size + 235 recv_ring_buffer_size; 236 237 hv_vmbus_ring_buffer_init( 238 &new_channel->outbound, 239 out, 240 send_ring_buffer_size); 241 242 hv_vmbus_ring_buffer_init( 243 &new_channel->inbound, 244 in, 245 recv_ring_buffer_size); 246 247 /* Create sysctl tree for this channel */ 248 vmbus_channel_sysctl_create(new_channel); 249 250 /** 251 * Establish the gpadl for the ring buffer 252 */ 253 new_channel->ring_buffer_gpadl_handle = 0; 254 255 ret = hv_vmbus_channel_establish_gpadl(new_channel, 256 new_channel->outbound.ring_buffer, 257 send_ring_buffer_size + recv_ring_buffer_size, 258 &new_channel->ring_buffer_gpadl_handle); 259 260 /* 261 * Open channel w/ the bufring GPADL on the target CPU. 262 */ 263 mh = vmbus_msghc_get(sc, sizeof(*req)); 264 if (mh == NULL) { 265 device_printf(sc->vmbus_dev, 266 "can not get msg hypercall for chopen(chan%u)\n", 267 new_channel->ch_id); 268 return ENXIO; 269 } 270 271 req = vmbus_msghc_dataptr(mh); 272 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN; 273 req->chm_chanid = new_channel->ch_id; 274 req->chm_openid = new_channel->ch_id; 275 req->chm_gpadl = new_channel->ring_buffer_gpadl_handle; 276 req->chm_vcpuid = new_channel->target_vcpu; 277 req->chm_rxbr_pgofs = send_ring_buffer_size >> PAGE_SHIFT; 278 if (user_data_len) 279 memcpy(req->chm_udata, user_data, user_data_len); 280 281 ret = vmbus_msghc_exec(sc, mh); 282 if (ret != 0) { 283 device_printf(sc->vmbus_dev, 284 "chopen(chan%u) msg hypercall exec failed: %d\n", 285 new_channel->ch_id, ret); 286 vmbus_msghc_put(sc, mh); 287 return ret; 288 } 289 290 msg = vmbus_msghc_wait_result(sc, mh); 291 resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data; 292 status = resp->chm_status; 293 294 vmbus_msghc_put(sc, mh); 295 296 if (status == 0) { 297 new_channel->state = HV_CHANNEL_OPENED_STATE; 298 if (bootverbose) { 299 device_printf(sc->vmbus_dev, "chan%u opened\n", 300 new_channel->ch_id); 301 } 302 } else { 303 device_printf(sc->vmbus_dev, "failed to open chan%u\n", 304 new_channel->ch_id); 305 ret = ENXIO; 306 } 307 return (ret); 308} 309 310/** 311 * @brief Establish a GPADL for the specified buffer 312 */ 313int 314hv_vmbus_channel_establish_gpadl(struct hv_vmbus_channel *channel, 315 void *contig_buffer, uint32_t size, uint32_t *gpadl0) 316{ 317 struct vmbus_softc *sc = channel->vmbus_sc; 318 struct vmbus_msghc *mh; 319 struct vmbus_chanmsg_gpadl_conn *req; 320 const struct vmbus_message *msg; 321 size_t reqsz; 322 uint32_t gpadl, status; 323 int page_count, range_len, i, cnt, error; 324 uint64_t page_id, paddr; 325 326 /* 327 * Preliminary checks. 328 */ 329 330 KASSERT((size & PAGE_MASK) == 0, 331 ("invalid GPA size %u, not multiple page size", size)); 332 page_count = size >> PAGE_SHIFT; 333 334 paddr = hv_get_phys_addr(contig_buffer); 335 KASSERT((paddr & PAGE_MASK) == 0, 336 ("GPA is not page aligned %jx", (uintmax_t)paddr)); 337 page_id = paddr >> PAGE_SHIFT; 338 339 range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); 340 /* 341 * We don't support multiple GPA ranges. 342 */ 343 if (range_len > UINT16_MAX) { 344 device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", 345 page_count); 346 return EOPNOTSUPP; 347 } 348 349 /* 350 * Allocate GPADL id. 351 */ 352 gpadl = vmbus_gpadl_alloc(sc); 353 *gpadl0 = gpadl; 354 355 /* 356 * Connect this GPADL to the target channel. 357 * 358 * NOTE: 359 * Since each message can only hold small set of page 360 * addresses, several messages may be required to 361 * complete the connection. 362 */ 363 if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) 364 cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; 365 else 366 cnt = page_count; 367 page_count -= cnt; 368 369 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, 370 chm_range.gpa_page[cnt]); 371 mh = vmbus_msghc_get(sc, reqsz); 372 if (mh == NULL) { 373 device_printf(sc->vmbus_dev, 374 "can not get msg hypercall for gpadl->chan%u\n", 375 channel->ch_id); 376 return EIO; 377 } 378 379 req = vmbus_msghc_dataptr(mh); 380 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN; 381 req->chm_chanid = channel->ch_id; 382 req->chm_gpadl = gpadl; 383 req->chm_range_len = range_len; 384 req->chm_range_cnt = 1; 385 req->chm_range.gpa_len = size; 386 req->chm_range.gpa_ofs = 0; 387 for (i = 0; i < cnt; ++i) 388 req->chm_range.gpa_page[i] = page_id++; 389 390 error = vmbus_msghc_exec(sc, mh); 391 if (error) { 392 device_printf(sc->vmbus_dev, 393 "gpadl->chan%u msg hypercall exec failed: %d\n", 394 channel->ch_id, error); 395 vmbus_msghc_put(sc, mh); 396 return error; 397 } 398 399 while (page_count > 0) { 400 struct vmbus_chanmsg_gpadl_subconn *subreq; 401 402 if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) 403 cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; 404 else 405 cnt = page_count; 406 page_count -= cnt; 407 408 reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, 409 chm_gpa_page[cnt]); 410 vmbus_msghc_reset(mh, reqsz); 411 412 subreq = vmbus_msghc_dataptr(mh); 413 subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN; 414 subreq->chm_gpadl = gpadl; 415 for (i = 0; i < cnt; ++i) 416 subreq->chm_gpa_page[i] = page_id++; 417 418 vmbus_msghc_exec_noresult(mh); 419 } 420 KASSERT(page_count == 0, ("invalid page count %d", page_count)); 421 422 msg = vmbus_msghc_wait_result(sc, mh); 423 status = ((const struct vmbus_chanmsg_gpadl_connresp *) 424 msg->msg_data)->chm_status; 425 426 vmbus_msghc_put(sc, mh); 427 428 if (status != 0) { 429 device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " 430 "status %u\n", channel->ch_id, status); 431 return EIO; 432 } else { 433 if (bootverbose) { 434 device_printf(sc->vmbus_dev, "gpadl->chan%u " 435 "succeeded\n", channel->ch_id); 436 } 437 } 438 return 0; 439} 440 441/* 442 * Disconnect the GPA from the target channel 443 */ 444int 445hv_vmbus_channel_teardown_gpdal(struct hv_vmbus_channel *chan, uint32_t gpadl) 446{ 447 struct vmbus_softc *sc = chan->vmbus_sc; 448 struct vmbus_msghc *mh; 449 struct vmbus_chanmsg_gpadl_disconn *req; 450 int error; 451 452 mh = vmbus_msghc_get(sc, sizeof(*req)); 453 if (mh == NULL) { 454 device_printf(sc->vmbus_dev, 455 "can not get msg hypercall for gpa x->chan%u\n", 456 chan->ch_id); 457 return EBUSY; 458 } 459 460 req = vmbus_msghc_dataptr(mh); 461 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN; 462 req->chm_chanid = chan->ch_id; 463 req->chm_gpadl = gpadl; 464 465 error = vmbus_msghc_exec(sc, mh); 466 if (error) { 467 device_printf(sc->vmbus_dev, 468 "gpa x->chan%u msg hypercall exec failed: %d\n", 469 chan->ch_id, error); 470 vmbus_msghc_put(sc, mh); 471 return error; 472 } 473 474 vmbus_msghc_wait_result(sc, mh); 475 /* Discard result; no useful information */ 476 vmbus_msghc_put(sc, mh); 477 478 return 0; 479} 480 481static void 482hv_vmbus_channel_close_internal(hv_vmbus_channel *channel) 483{ 484 struct vmbus_softc *sc = channel->vmbus_sc; 485 struct vmbus_msghc *mh; 486 struct vmbus_chanmsg_chclose *req; 487 struct taskqueue *rxq = channel->rxq; 488 int error; 489 490 channel->state = HV_CHANNEL_OPEN_STATE; 491 sysctl_ctx_free(&channel->ch_sysctl_ctx); 492 493 /* 494 * set rxq to NULL to avoid more requests be scheduled 495 */ 496 channel->rxq = NULL; 497 taskqueue_drain(rxq, &channel->channel_task); 498 channel->on_channel_callback = NULL; 499 500 /** 501 * Send a closing message 502 */ 503 504 mh = vmbus_msghc_get(sc, sizeof(*req)); 505 if (mh == NULL) { 506 device_printf(sc->vmbus_dev, 507 "can not get msg hypercall for chclose(chan%u)\n", 508 channel->ch_id); 509 return; 510 } 511 512 req = vmbus_msghc_dataptr(mh); 513 req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; 514 req->chm_chanid = channel->ch_id; 515 516 error = vmbus_msghc_exec_noresult(mh); 517 vmbus_msghc_put(sc, mh); 518 519 if (error) { 520 device_printf(sc->vmbus_dev, 521 "chclose(chan%u) msg hypercall exec failed: %d\n", 522 channel->ch_id, error); 523 return; 524 } else if (bootverbose) { 525 device_printf(sc->vmbus_dev, "close chan%u\n", 526 channel->ch_id); 527 } 528 529 /* Tear down the gpadl for the channel's ring buffer */ 530 if (channel->ring_buffer_gpadl_handle) { 531 hv_vmbus_channel_teardown_gpdal(channel, 532 channel->ring_buffer_gpadl_handle); 533 } 534 535 /* TODO: Send a msg to release the childRelId */ 536 537 /* cleanup the ring buffers for this channel */ 538 hv_ring_buffer_cleanup(&channel->outbound); 539 hv_ring_buffer_cleanup(&channel->inbound); 540 541 contigfree(channel->ring_buffer_pages, channel->ring_buffer_size, 542 M_DEVBUF); 543} 544 545/** 546 * @brief Close the specified channel 547 */ 548void 549hv_vmbus_channel_close(hv_vmbus_channel *channel) 550{ 551 hv_vmbus_channel* sub_channel; 552 553 if (channel->primary_channel != NULL) { 554 /* 555 * We only close multi-channels when the primary is 556 * closed. 557 */ 558 return; 559 } 560 561 /* 562 * Close all multi-channels first. 563 */ 564 TAILQ_FOREACH(sub_channel, &channel->sc_list_anchor, 565 sc_list_entry) { 566 if (sub_channel->state != HV_CHANNEL_OPENED_STATE) 567 continue; 568 hv_vmbus_channel_close_internal(sub_channel); 569 } 570 /* 571 * Then close the primary channel. 572 */ 573 hv_vmbus_channel_close_internal(channel); 574} 575 576/** 577 * @brief Send the specified buffer on the given channel 578 */ 579int 580hv_vmbus_channel_send_packet( 581 hv_vmbus_channel* channel, 582 void* buffer, 583 uint32_t buffer_len, 584 uint64_t request_id, 585 hv_vmbus_packet_type type, 586 uint32_t flags) 587{ 588 int ret = 0; 589 hv_vm_packet_descriptor desc; 590 uint32_t packet_len; 591 uint64_t aligned_data; 592 uint32_t packet_len_aligned; 593 boolean_t need_sig; 594 hv_vmbus_sg_buffer_list buffer_list[3]; 595 596 packet_len = sizeof(hv_vm_packet_descriptor) + buffer_len; 597 packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 598 aligned_data = 0; 599 600 /* Setup the descriptor */ 601 desc.type = type; /* HV_VMBUS_PACKET_TYPE_DATA_IN_BAND; */ 602 desc.flags = flags; /* HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED */ 603 /* in 8-bytes granularity */ 604 desc.data_offset8 = sizeof(hv_vm_packet_descriptor) >> 3; 605 desc.length8 = (uint16_t) (packet_len_aligned >> 3); 606 desc.transaction_id = request_id; 607 608 buffer_list[0].data = &desc; 609 buffer_list[0].length = sizeof(hv_vm_packet_descriptor); 610 611 buffer_list[1].data = buffer; 612 buffer_list[1].length = buffer_len; 613 614 buffer_list[2].data = &aligned_data; 615 buffer_list[2].length = packet_len_aligned - packet_len; 616 617 ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 618 &need_sig); 619 620 /* TODO: We should determine if this is optional */ 621 if (ret == 0 && need_sig) 622 vmbus_chan_send_event(channel); 623 624 return (ret); 625} 626 627/** 628 * @brief Send a range of single-page buffer packets using 629 * a GPADL Direct packet type 630 */ 631int 632hv_vmbus_channel_send_packet_pagebuffer( 633 hv_vmbus_channel* channel, 634 hv_vmbus_page_buffer page_buffers[], 635 uint32_t page_count, 636 void* buffer, 637 uint32_t buffer_len, 638 uint64_t request_id) 639{ 640 641 int ret = 0; 642 boolean_t need_sig; 643 uint32_t packet_len; 644 uint32_t page_buflen; 645 uint32_t packetLen_aligned; 646 hv_vmbus_sg_buffer_list buffer_list[4]; 647 hv_vmbus_channel_packet_page_buffer desc; 648 uint32_t descSize; 649 uint64_t alignedData = 0; 650 651 if (page_count > HV_MAX_PAGE_BUFFER_COUNT) 652 return (EINVAL); 653 654 /* 655 * Adjust the size down since hv_vmbus_channel_packet_page_buffer 656 * is the largest size we support 657 */ 658 descSize = __offsetof(hv_vmbus_channel_packet_page_buffer, range); 659 page_buflen = sizeof(hv_vmbus_page_buffer) * page_count; 660 packet_len = descSize + page_buflen + buffer_len; 661 packetLen_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 662 663 /* Setup the descriptor */ 664 desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 665 desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 666 /* in 8-bytes granularity */ 667 desc.data_offset8 = (descSize + page_buflen) >> 3; 668 desc.length8 = (uint16_t) (packetLen_aligned >> 3); 669 desc.transaction_id = request_id; 670 desc.range_count = page_count; 671 672 buffer_list[0].data = &desc; 673 buffer_list[0].length = descSize; 674 675 buffer_list[1].data = page_buffers; 676 buffer_list[1].length = page_buflen; 677 678 buffer_list[2].data = buffer; 679 buffer_list[2].length = buffer_len; 680 681 buffer_list[3].data = &alignedData; 682 buffer_list[3].length = packetLen_aligned - packet_len; 683 684 ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 4, 685 &need_sig); 686 687 /* TODO: We should determine if this is optional */ 688 if (ret == 0 && need_sig) 689 vmbus_chan_send_event(channel); 690 691 return (ret); 692} 693 694/** 695 * @brief Send a multi-page buffer packet using a GPADL Direct packet type 696 */ 697int 698hv_vmbus_channel_send_packet_multipagebuffer( 699 hv_vmbus_channel* channel, 700 hv_vmbus_multipage_buffer* multi_page_buffer, 701 void* buffer, 702 uint32_t buffer_len, 703 uint64_t request_id) 704{ 705 706 int ret = 0; 707 uint32_t desc_size; 708 boolean_t need_sig; 709 uint32_t packet_len; 710 uint32_t packet_len_aligned; 711 uint32_t pfn_count; 712 uint64_t aligned_data = 0; 713 hv_vmbus_sg_buffer_list buffer_list[3]; 714 hv_vmbus_channel_packet_multipage_buffer desc; 715 716 pfn_count = 717 HV_NUM_PAGES_SPANNED( 718 multi_page_buffer->offset, 719 multi_page_buffer->length); 720 721 if ((pfn_count == 0) || (pfn_count > HV_MAX_MULTIPAGE_BUFFER_COUNT)) 722 return (EINVAL); 723 /* 724 * Adjust the size down since hv_vmbus_channel_packet_multipage_buffer 725 * is the largest size we support 726 */ 727 desc_size = 728 sizeof(hv_vmbus_channel_packet_multipage_buffer) - 729 ((HV_MAX_MULTIPAGE_BUFFER_COUNT - pfn_count) * 730 sizeof(uint64_t)); 731 packet_len = desc_size + buffer_len; 732 packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 733 734 /* 735 * Setup the descriptor 736 */ 737 desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 738 desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 739 desc.data_offset8 = desc_size >> 3; /* in 8-bytes granularity */ 740 desc.length8 = (uint16_t) (packet_len_aligned >> 3); 741 desc.transaction_id = request_id; 742 desc.range_count = 1; 743 744 desc.range.length = multi_page_buffer->length; 745 desc.range.offset = multi_page_buffer->offset; 746 747 memcpy(desc.range.pfn_array, multi_page_buffer->pfn_array, 748 pfn_count * sizeof(uint64_t)); 749 750 buffer_list[0].data = &desc; 751 buffer_list[0].length = desc_size; 752 753 buffer_list[1].data = buffer; 754 buffer_list[1].length = buffer_len; 755 756 buffer_list[2].data = &aligned_data; 757 buffer_list[2].length = packet_len_aligned - packet_len; 758 759 ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 760 &need_sig); 761 762 /* TODO: We should determine if this is optional */ 763 if (ret == 0 && need_sig) 764 vmbus_chan_send_event(channel); 765 766 return (ret); 767} 768 769/** 770 * @brief Retrieve the user packet on the specified channel 771 */ 772int 773hv_vmbus_channel_recv_packet( 774 hv_vmbus_channel* channel, 775 void* Buffer, 776 uint32_t buffer_len, 777 uint32_t* buffer_actual_len, 778 uint64_t* request_id) 779{ 780 int ret; 781 uint32_t user_len; 782 uint32_t packet_len; 783 hv_vm_packet_descriptor desc; 784 785 *buffer_actual_len = 0; 786 *request_id = 0; 787 788 ret = hv_ring_buffer_peek(&channel->inbound, &desc, 789 sizeof(hv_vm_packet_descriptor)); 790 if (ret != 0) 791 return (0); 792 793 packet_len = desc.length8 << 3; 794 user_len = packet_len - (desc.data_offset8 << 3); 795 796 *buffer_actual_len = user_len; 797 798 if (user_len > buffer_len) 799 return (EINVAL); 800 801 *request_id = desc.transaction_id; 802 803 /* Copy over the packet to the user buffer */ 804 ret = hv_ring_buffer_read(&channel->inbound, Buffer, user_len, 805 (desc.data_offset8 << 3)); 806 807 return (0); 808} 809 810/** 811 * @brief Retrieve the raw packet on the specified channel 812 */ 813int 814hv_vmbus_channel_recv_packet_raw( 815 hv_vmbus_channel* channel, 816 void* buffer, 817 uint32_t buffer_len, 818 uint32_t* buffer_actual_len, 819 uint64_t* request_id) 820{ 821 int ret; 822 uint32_t packetLen; 823 hv_vm_packet_descriptor desc; 824 825 *buffer_actual_len = 0; 826 *request_id = 0; 827 828 ret = hv_ring_buffer_peek( 829 &channel->inbound, &desc, 830 sizeof(hv_vm_packet_descriptor)); 831 832 if (ret != 0) 833 return (0); 834 835 packetLen = desc.length8 << 3; 836 *buffer_actual_len = packetLen; 837 838 if (packetLen > buffer_len) 839 return (ENOBUFS); 840 841 *request_id = desc.transaction_id; 842 843 /* Copy over the entire packet to the user buffer */ 844 ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0); 845 846 return (0); 847} 848 849static void 850vmbus_chan_task(void *xchan, int pending __unused) 851{ 852 struct hv_vmbus_channel *chan = xchan; 853 void (*callback)(void *); 854 void *arg; 855 856 arg = chan->channel_callback_context; 857 callback = chan->on_channel_callback; 858 859 /* 860 * Optimize host to guest signaling by ensuring: 861 * 1. While reading the channel, we disable interrupts from 862 * host. 863 * 2. Ensure that we process all posted messages from the host 864 * before returning from this callback. 865 * 3. Once we return, enable signaling from the host. Once this 866 * state is set we check to see if additional packets are 867 * available to read. In this case we repeat the process. 868 * 869 * NOTE: Interrupt has been disabled in the ISR. 870 */ 871 for (;;) { 872 uint32_t left; 873 874 callback(arg); 875 876 left = hv_ring_buffer_read_end(&chan->inbound); 877 if (left == 0) { 878 /* No more data in RX bufring; done */ 879 break; 880 } 881 hv_ring_buffer_read_begin(&chan->inbound); 882 } 883} 884 885static void 886vmbus_chan_task_nobatch(void *xchan, int pending __unused) 887{ 888 struct hv_vmbus_channel *chan = xchan; 889 890 chan->on_channel_callback(chan->channel_callback_context); 891} 892 893static __inline void 894vmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags, 895 int flag_cnt) 896{ 897 int f; 898 899 for (f = 0; f < flag_cnt; ++f) { 900 uint32_t chid_base; 901 u_long flags; 902 int chid_ofs; 903 904 if (event_flags[f] == 0) 905 continue; 906 907 flags = atomic_swap_long(&event_flags[f], 0); 908 chid_base = f << VMBUS_EVTFLAG_SHIFT; 909 910 while ((chid_ofs = ffsl(flags)) != 0) { 911 struct hv_vmbus_channel *channel; 912 913 --chid_ofs; /* NOTE: ffsl is 1-based */ 914 flags &= ~(1UL << chid_ofs); 915 916 channel = sc->vmbus_chmap[chid_base + chid_ofs]; 917 918 /* if channel is closed or closing */ 919 if (channel == NULL || channel->rxq == NULL) 920 continue; 921 922 if (channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) 923 hv_ring_buffer_read_begin(&channel->inbound); 924 taskqueue_enqueue(channel->rxq, &channel->channel_task); 925 } 926 } 927} 928 929void 930vmbus_event_proc(struct vmbus_softc *sc, int cpu) 931{ 932 struct vmbus_evtflags *eventf; 933 934 /* 935 * On Host with Win8 or above, the event page can be checked directly 936 * to get the id of the channel that has the pending interrupt. 937 */ 938 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 939 vmbus_event_flags_proc(sc, eventf->evt_flags, 940 VMBUS_PCPU_GET(sc, event_flags_cnt, cpu)); 941} 942 943void 944vmbus_event_proc_compat(struct vmbus_softc *sc, int cpu) 945{ 946 struct vmbus_evtflags *eventf; 947 948 eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 949 if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) { 950 vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags, 951 VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT); 952 } 953} 954 955static void 956vmbus_chan_update_evtflagcnt(struct vmbus_softc *sc, 957 const struct hv_vmbus_channel *chan) 958{ 959 volatile int *flag_cnt_ptr; 960 int flag_cnt; 961 962 flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1; 963 flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->target_cpu); 964 965 for (;;) { 966 int old_flag_cnt; 967 968 old_flag_cnt = *flag_cnt_ptr; 969 if (old_flag_cnt >= flag_cnt) 970 break; 971 if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) { 972 if (bootverbose) { 973 device_printf(sc->vmbus_dev, 974 "channel%u update cpu%d flag_cnt to %d\n", 975 chan->ch_id, 976 chan->target_cpu, flag_cnt); 977 } 978 break; 979 } 980 } 981} 982