vmbus_chan.c revision 302695
1250199Sgrehan/*- 2298446Ssephe * Copyright (c) 2009-2012,2016 Microsoft Corp. 3250199Sgrehan * Copyright (c) 2012 NetApp Inc. 4250199Sgrehan * Copyright (c) 2012 Citrix Inc. 5250199Sgrehan * All rights reserved. 6250199Sgrehan * 7250199Sgrehan * Redistribution and use in source and binary forms, with or without 8250199Sgrehan * modification, are permitted provided that the following conditions 9250199Sgrehan * are met: 10250199Sgrehan * 1. Redistributions of source code must retain the above copyright 11250199Sgrehan * notice unmodified, this list of conditions, and the following 12250199Sgrehan * disclaimer. 13250199Sgrehan * 2. Redistributions in binary form must reproduce the above copyright 14250199Sgrehan * notice, this list of conditions and the following disclaimer in the 15250199Sgrehan * documentation and/or other materials provided with the distribution. 16250199Sgrehan * 17250199Sgrehan * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18250199Sgrehan * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19250199Sgrehan * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20250199Sgrehan * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21250199Sgrehan * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22250199Sgrehan * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23250199Sgrehan * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24250199Sgrehan * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25250199Sgrehan * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26250199Sgrehan * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27250199Sgrehan */ 28250199Sgrehan 29256276Sdim#include <sys/cdefs.h> 30256276Sdim__FBSDID("$FreeBSD: head/sys/dev/hyperv/vmbus/hv_channel.c 302695 2016-07-13 04:31:08Z sephe $"); 31256276Sdim 32250199Sgrehan#include <sys/param.h> 33296028Ssephe#include <sys/kernel.h> 34250199Sgrehan#include <sys/malloc.h> 35250199Sgrehan#include <sys/systm.h> 36250199Sgrehan#include <sys/mbuf.h> 37250199Sgrehan#include <sys/lock.h> 38250199Sgrehan#include <sys/mutex.h> 39296181Ssephe#include <sys/sysctl.h> 40301588Ssephe 41301588Ssephe#include <machine/atomic.h> 42250199Sgrehan#include <machine/bus.h> 43301588Ssephe 44250199Sgrehan#include <vm/vm.h> 45250199Sgrehan#include <vm/vm_param.h> 46250199Sgrehan#include <vm/pmap.h> 47250199Sgrehan 48300102Ssephe#include <dev/hyperv/vmbus/hv_vmbus_priv.h> 49302619Ssephe#include <dev/hyperv/vmbus/hyperv_var.h> 50301588Ssephe#include <dev/hyperv/vmbus/vmbus_reg.h> 51300102Ssephe#include <dev/hyperv/vmbus/vmbus_var.h> 52250199Sgrehan 53250199Sgrehanstatic void vmbus_channel_set_event(hv_vmbus_channel* channel); 54294886Ssephestatic void VmbusProcessChannelEvent(void* channel, int pending); 55302692Ssephestatic void vmbus_chan_update_evtflagcnt(struct vmbus_softc *, 56302692Ssephe const struct hv_vmbus_channel *); 57250199Sgrehan 58250199Sgrehan/** 59250199Sgrehan * @brief Trigger an event notification on the specified channel 60250199Sgrehan */ 61250199Sgrehanstatic void 62250199Sgrehanvmbus_channel_set_event(hv_vmbus_channel *channel) 63250199Sgrehan{ 64302618Ssephe struct vmbus_softc *sc = channel->vmbus_sc; 65302693Ssephe uint32_t chanid = channel->ch_id; 66302618Ssephe 67302618Ssephe atomic_set_long(&sc->vmbus_tx_evtflags[chanid >> VMBUS_EVTFLAG_SHIFT], 68302618Ssephe 1UL << (chanid & VMBUS_EVTFLAG_MASK)); 69302618Ssephe 70302695Ssephe if (channel->ch_flags & VMBUS_CHAN_FLAG_HASMNF) { 71301583Ssephe hv_vmbus_monitor_page *monitor_page; 72250199Sgrehan 73301583Ssephe monitor_page = sc->vmbus_mnf2; 74250199Sgrehan synch_set_bit(channel->monitor_bit, 75250199Sgrehan (uint32_t *)&monitor_page-> 76256276Sdim trigger_group[channel->monitor_group].u.pending); 77250199Sgrehan } else { 78302619Ssephe hypercall_signal_event(channel->ch_sigevt_dma.hv_paddr); 79250199Sgrehan } 80250199Sgrehan 81250199Sgrehan} 82250199Sgrehan 83296289Ssephestatic int 84296289Ssephevmbus_channel_sysctl_monalloc(SYSCTL_HANDLER_ARGS) 85296289Ssephe{ 86296289Ssephe struct hv_vmbus_channel *chan = arg1; 87296289Ssephe int alloc = 0; 88296289Ssephe 89302695Ssephe if (chan->ch_flags & VMBUS_CHAN_FLAG_HASMNF) 90296289Ssephe alloc = 1; 91296289Ssephe return sysctl_handle_int(oidp, &alloc, 0, req); 92296289Ssephe} 93296289Ssephe 94296181Ssephestatic void 95296290Ssephevmbus_channel_sysctl_create(hv_vmbus_channel* channel) 96296181Ssephe{ 97296181Ssephe device_t dev; 98296181Ssephe struct sysctl_oid *devch_sysctl; 99296181Ssephe struct sysctl_oid *devch_id_sysctl, *devch_sub_sysctl; 100296181Ssephe struct sysctl_oid *devch_id_in_sysctl, *devch_id_out_sysctl; 101296181Ssephe struct sysctl_ctx_list *ctx; 102296181Ssephe uint32_t ch_id; 103296181Ssephe uint16_t sub_ch_id; 104296181Ssephe char name[16]; 105296181Ssephe 106296181Ssephe hv_vmbus_channel* primary_ch = channel->primary_channel; 107296181Ssephe 108296181Ssephe if (primary_ch == NULL) { 109296181Ssephe dev = channel->device->device; 110302693Ssephe ch_id = channel->ch_id; 111296181Ssephe } else { 112296181Ssephe dev = primary_ch->device->device; 113302693Ssephe ch_id = primary_ch->ch_id; 114302694Ssephe sub_ch_id = channel->ch_subidx; 115296181Ssephe } 116302633Ssephe ctx = &channel->ch_sysctl_ctx; 117302633Ssephe sysctl_ctx_init(ctx); 118296181Ssephe /* This creates dev.DEVNAME.DEVUNIT.channel tree */ 119296181Ssephe devch_sysctl = SYSCTL_ADD_NODE(ctx, 120296181Ssephe SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 121298693Ssephe OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 122296181Ssephe /* This creates dev.DEVNAME.DEVUNIT.channel.CHANID tree */ 123296181Ssephe snprintf(name, sizeof(name), "%d", ch_id); 124296181Ssephe devch_id_sysctl = SYSCTL_ADD_NODE(ctx, 125296181Ssephe SYSCTL_CHILDREN(devch_sysctl), 126298693Ssephe OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 127296181Ssephe 128296181Ssephe if (primary_ch != NULL) { 129296181Ssephe devch_sub_sysctl = SYSCTL_ADD_NODE(ctx, 130296181Ssephe SYSCTL_CHILDREN(devch_id_sysctl), 131298693Ssephe OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 132296181Ssephe snprintf(name, sizeof(name), "%d", sub_ch_id); 133296181Ssephe devch_id_sysctl = SYSCTL_ADD_NODE(ctx, 134296181Ssephe SYSCTL_CHILDREN(devch_sub_sysctl), 135298693Ssephe OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 136296188Ssephe 137296188Ssephe SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), 138296188Ssephe OID_AUTO, "chanid", CTLFLAG_RD, 139302693Ssephe &channel->ch_id, 0, "channel id"); 140296181Ssephe } 141296188Ssephe SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, 142296188Ssephe "cpu", CTLFLAG_RD, &channel->target_cpu, 0, "owner CPU id"); 143296289Ssephe SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, 144298693Ssephe "monitor_allocated", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 145298693Ssephe channel, 0, vmbus_channel_sysctl_monalloc, "I", 146296289Ssephe "is monitor allocated to this channel"); 147296188Ssephe 148296181Ssephe devch_id_in_sysctl = SYSCTL_ADD_NODE(ctx, 149296181Ssephe SYSCTL_CHILDREN(devch_id_sysctl), 150296181Ssephe OID_AUTO, 151296181Ssephe "in", 152298693Ssephe CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 153296181Ssephe devch_id_out_sysctl = SYSCTL_ADD_NODE(ctx, 154296181Ssephe SYSCTL_CHILDREN(devch_id_sysctl), 155296181Ssephe OID_AUTO, 156296181Ssephe "out", 157298693Ssephe CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 158296181Ssephe hv_ring_buffer_stat(ctx, 159296181Ssephe SYSCTL_CHILDREN(devch_id_in_sysctl), 160296181Ssephe &(channel->inbound), 161296181Ssephe "inbound ring buffer stats"); 162296181Ssephe hv_ring_buffer_stat(ctx, 163296181Ssephe SYSCTL_CHILDREN(devch_id_out_sysctl), 164296181Ssephe &(channel->outbound), 165296181Ssephe "outbound ring buffer stats"); 166296181Ssephe} 167296290Ssephe 168250199Sgrehan/** 169250199Sgrehan * @brief Open the specified channel 170250199Sgrehan */ 171250199Sgrehanint 172250199Sgrehanhv_vmbus_channel_open( 173250199Sgrehan hv_vmbus_channel* new_channel, 174250199Sgrehan uint32_t send_ring_buffer_size, 175250199Sgrehan uint32_t recv_ring_buffer_size, 176250199Sgrehan void* user_data, 177250199Sgrehan uint32_t user_data_len, 178250199Sgrehan hv_vmbus_pfn_channel_callback pfn_on_channel_callback, 179250199Sgrehan void* context) 180250199Sgrehan{ 181302607Ssephe struct vmbus_softc *sc = new_channel->vmbus_sc; 182302607Ssephe const struct vmbus_chanmsg_chopen_resp *resp; 183302607Ssephe const struct vmbus_message *msg; 184302607Ssephe struct vmbus_chanmsg_chopen *req; 185302607Ssephe struct vmbus_msghc *mh; 186302607Ssephe uint32_t status; 187250199Sgrehan int ret = 0; 188250199Sgrehan void *in, *out; 189250199Sgrehan 190302607Ssephe if (user_data_len > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) { 191302607Ssephe device_printf(sc->vmbus_dev, 192302607Ssephe "invalid udata len %u for chan%u\n", 193302693Ssephe user_data_len, new_channel->ch_id); 194302607Ssephe return EINVAL; 195302607Ssephe } 196302607Ssephe 197282212Swhu mtx_lock(&new_channel->sc_lock); 198282212Swhu if (new_channel->state == HV_CHANNEL_OPEN_STATE) { 199282212Swhu new_channel->state = HV_CHANNEL_OPENING_STATE; 200282212Swhu } else { 201282212Swhu mtx_unlock(&new_channel->sc_lock); 202282212Swhu if(bootverbose) 203282212Swhu printf("VMBUS: Trying to open channel <%p> which in " 204282212Swhu "%d state.\n", new_channel, new_channel->state); 205282212Swhu return (EINVAL); 206282212Swhu } 207282212Swhu mtx_unlock(&new_channel->sc_lock); 208282212Swhu 209250199Sgrehan new_channel->on_channel_callback = pfn_on_channel_callback; 210250199Sgrehan new_channel->channel_callback_context = context; 211250199Sgrehan 212302692Ssephe vmbus_chan_update_evtflagcnt(sc, new_channel); 213300102Ssephe 214302557Ssephe new_channel->rxq = VMBUS_PCPU_GET(new_channel->vmbus_sc, event_tq, 215300646Ssephe new_channel->target_cpu); 216294886Ssephe TASK_INIT(&new_channel->channel_task, 0, VmbusProcessChannelEvent, new_channel); 217294886Ssephe 218250199Sgrehan /* Allocate the ring buffer */ 219250199Sgrehan out = contigmalloc((send_ring_buffer_size + recv_ring_buffer_size), 220256350Sgrehan M_DEVBUF, M_ZERO, 0UL, BUS_SPACE_MAXADDR, PAGE_SIZE, 0); 221250199Sgrehan KASSERT(out != NULL, 222250199Sgrehan ("Error VMBUS: contigmalloc failed to allocate Ring Buffer!")); 223250199Sgrehan if (out == NULL) 224256350Sgrehan return (ENOMEM); 225250199Sgrehan 226250199Sgrehan in = ((uint8_t *) out + send_ring_buffer_size); 227250199Sgrehan 228250199Sgrehan new_channel->ring_buffer_pages = out; 229256350Sgrehan new_channel->ring_buffer_page_count = (send_ring_buffer_size + 230256350Sgrehan recv_ring_buffer_size) >> PAGE_SHIFT; 231256350Sgrehan new_channel->ring_buffer_size = send_ring_buffer_size + 232256350Sgrehan recv_ring_buffer_size; 233250199Sgrehan 234250199Sgrehan hv_vmbus_ring_buffer_init( 235250199Sgrehan &new_channel->outbound, 236250199Sgrehan out, 237250199Sgrehan send_ring_buffer_size); 238250199Sgrehan 239250199Sgrehan hv_vmbus_ring_buffer_init( 240250199Sgrehan &new_channel->inbound, 241250199Sgrehan in, 242250199Sgrehan recv_ring_buffer_size); 243250199Sgrehan 244296290Ssephe /* Create sysctl tree for this channel */ 245296290Ssephe vmbus_channel_sysctl_create(new_channel); 246296181Ssephe 247250199Sgrehan /** 248250199Sgrehan * Establish the gpadl for the ring buffer 249250199Sgrehan */ 250250199Sgrehan new_channel->ring_buffer_gpadl_handle = 0; 251250199Sgrehan 252250199Sgrehan ret = hv_vmbus_channel_establish_gpadl(new_channel, 253250199Sgrehan new_channel->outbound.ring_buffer, 254250199Sgrehan send_ring_buffer_size + recv_ring_buffer_size, 255250199Sgrehan &new_channel->ring_buffer_gpadl_handle); 256250199Sgrehan 257302607Ssephe /* 258302607Ssephe * Open channel w/ the bufring GPADL on the target CPU. 259250199Sgrehan */ 260302607Ssephe mh = vmbus_msghc_get(sc, sizeof(*req)); 261302607Ssephe if (mh == NULL) { 262302607Ssephe device_printf(sc->vmbus_dev, 263302607Ssephe "can not get msg hypercall for chopen(chan%u)\n", 264302693Ssephe new_channel->ch_id); 265302607Ssephe return ENXIO; 266302607Ssephe } 267250199Sgrehan 268302607Ssephe req = vmbus_msghc_dataptr(mh); 269302607Ssephe req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN; 270302693Ssephe req->chm_chanid = new_channel->ch_id; 271302693Ssephe req->chm_openid = new_channel->ch_id; 272302607Ssephe req->chm_gpadl = new_channel->ring_buffer_gpadl_handle; 273302607Ssephe req->chm_vcpuid = new_channel->target_vcpu; 274302607Ssephe req->chm_rxbr_pgofs = send_ring_buffer_size >> PAGE_SHIFT; 275250199Sgrehan if (user_data_len) 276302607Ssephe memcpy(req->chm_udata, user_data, user_data_len); 277250199Sgrehan 278302607Ssephe ret = vmbus_msghc_exec(sc, mh); 279302607Ssephe if (ret != 0) { 280302607Ssephe device_printf(sc->vmbus_dev, 281302607Ssephe "chopen(chan%u) msg hypercall exec failed: %d\n", 282302693Ssephe new_channel->ch_id, ret); 283302607Ssephe vmbus_msghc_put(sc, mh); 284302607Ssephe return ret; 285302607Ssephe } 286250199Sgrehan 287302607Ssephe msg = vmbus_msghc_wait_result(sc, mh); 288302607Ssephe resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data; 289302607Ssephe status = resp->chm_status; 290250199Sgrehan 291302607Ssephe vmbus_msghc_put(sc, mh); 292250199Sgrehan 293302607Ssephe if (status == 0) { 294302607Ssephe new_channel->state = HV_CHANNEL_OPENED_STATE; 295302607Ssephe if (bootverbose) { 296302607Ssephe device_printf(sc->vmbus_dev, "chan%u opened\n", 297302693Ssephe new_channel->ch_id); 298302607Ssephe } 299250199Sgrehan } else { 300302607Ssephe device_printf(sc->vmbus_dev, "failed to open chan%u\n", 301302693Ssephe new_channel->ch_id); 302302607Ssephe ret = ENXIO; 303250199Sgrehan } 304250199Sgrehan return (ret); 305250199Sgrehan} 306250199Sgrehan 307250199Sgrehan/** 308302609Ssephe * @brief Establish a GPADL for the specified buffer 309250199Sgrehan */ 310302609Ssepheint 311302609Ssephehv_vmbus_channel_establish_gpadl(struct hv_vmbus_channel *channel, 312302609Ssephe void *contig_buffer, uint32_t size, uint32_t *gpadl0) 313250199Sgrehan{ 314302609Ssephe struct vmbus_softc *sc = channel->vmbus_sc; 315302609Ssephe struct vmbus_msghc *mh; 316302609Ssephe struct vmbus_chanmsg_gpadl_conn *req; 317302609Ssephe const struct vmbus_message *msg; 318302609Ssephe size_t reqsz; 319302609Ssephe uint32_t gpadl, status; 320302609Ssephe int page_count, range_len, i, cnt, error; 321302609Ssephe uint64_t page_id, paddr; 322250199Sgrehan 323302609Ssephe /* 324302609Ssephe * Preliminary checks. 325302609Ssephe */ 326250199Sgrehan 327302609Ssephe KASSERT((size & PAGE_MASK) == 0, 328302609Ssephe ("invalid GPA size %u, not multiple page size", size)); 329250199Sgrehan page_count = size >> PAGE_SHIFT; 330250199Sgrehan 331302609Ssephe paddr = hv_get_phys_addr(contig_buffer); 332302609Ssephe KASSERT((paddr & PAGE_MASK) == 0, 333302609Ssephe ("GPA is not page aligned %jx", (uintmax_t)paddr)); 334302609Ssephe page_id = paddr >> PAGE_SHIFT; 335250199Sgrehan 336302609Ssephe range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); 337302609Ssephe /* 338302609Ssephe * We don't support multiple GPA ranges. 339302609Ssephe */ 340302609Ssephe if (range_len > UINT16_MAX) { 341302609Ssephe device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", 342302609Ssephe page_count); 343302609Ssephe return EOPNOTSUPP; 344250199Sgrehan } 345250199Sgrehan 346302609Ssephe /* 347302609Ssephe * Allocate GPADL id. 348302609Ssephe */ 349302630Ssephe gpadl = vmbus_gpadl_alloc(sc); 350302609Ssephe *gpadl0 = gpadl; 351250199Sgrehan 352302609Ssephe /* 353302609Ssephe * Connect this GPADL to the target channel. 354302609Ssephe * 355302609Ssephe * NOTE: 356302609Ssephe * Since each message can only hold small set of page 357302609Ssephe * addresses, several messages may be required to 358302609Ssephe * complete the connection. 359302609Ssephe */ 360302609Ssephe if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) 361302609Ssephe cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; 362302609Ssephe else 363302609Ssephe cnt = page_count; 364302609Ssephe page_count -= cnt; 365250199Sgrehan 366302609Ssephe reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, 367302609Ssephe chm_range.gpa_page[cnt]); 368302609Ssephe mh = vmbus_msghc_get(sc, reqsz); 369302609Ssephe if (mh == NULL) { 370302609Ssephe device_printf(sc->vmbus_dev, 371302609Ssephe "can not get msg hypercall for gpadl->chan%u\n", 372302693Ssephe channel->ch_id); 373302609Ssephe return EIO; 374250199Sgrehan } 375250199Sgrehan 376302609Ssephe req = vmbus_msghc_dataptr(mh); 377302609Ssephe req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN; 378302693Ssephe req->chm_chanid = channel->ch_id; 379302609Ssephe req->chm_gpadl = gpadl; 380302609Ssephe req->chm_range_len = range_len; 381302609Ssephe req->chm_range_cnt = 1; 382302609Ssephe req->chm_range.gpa_len = size; 383302609Ssephe req->chm_range.gpa_ofs = 0; 384302609Ssephe for (i = 0; i < cnt; ++i) 385302609Ssephe req->chm_range.gpa_page[i] = page_id++; 386250199Sgrehan 387302609Ssephe error = vmbus_msghc_exec(sc, mh); 388302609Ssephe if (error) { 389302609Ssephe device_printf(sc->vmbus_dev, 390302609Ssephe "gpadl->chan%u msg hypercall exec failed: %d\n", 391302693Ssephe channel->ch_id, error); 392302609Ssephe vmbus_msghc_put(sc, mh); 393302609Ssephe return error; 394302609Ssephe } 395250199Sgrehan 396302609Ssephe while (page_count > 0) { 397302609Ssephe struct vmbus_chanmsg_gpadl_subconn *subreq; 398250199Sgrehan 399302609Ssephe if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) 400302609Ssephe cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; 401302609Ssephe else 402302609Ssephe cnt = page_count; 403302609Ssephe page_count -= cnt; 404250199Sgrehan 405302609Ssephe reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, 406302609Ssephe chm_gpa_page[cnt]); 407302609Ssephe vmbus_msghc_reset(mh, reqsz); 408250199Sgrehan 409302609Ssephe subreq = vmbus_msghc_dataptr(mh); 410302609Ssephe subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN; 411302609Ssephe subreq->chm_gpadl = gpadl; 412302609Ssephe for (i = 0; i < cnt; ++i) 413302609Ssephe subreq->chm_gpa_page[i] = page_id++; 414250199Sgrehan 415302609Ssephe vmbus_msghc_exec_noresult(mh); 416250199Sgrehan } 417302609Ssephe KASSERT(page_count == 0, ("invalid page count %d", page_count)); 418250199Sgrehan 419302609Ssephe msg = vmbus_msghc_wait_result(sc, mh); 420302609Ssephe status = ((const struct vmbus_chanmsg_gpadl_connresp *) 421302609Ssephe msg->msg_data)->chm_status; 422250199Sgrehan 423302609Ssephe vmbus_msghc_put(sc, mh); 424250199Sgrehan 425302609Ssephe if (status != 0) { 426302609Ssephe device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " 427302693Ssephe "status %u\n", channel->ch_id, status); 428302609Ssephe return EIO; 429302632Ssephe } else { 430302632Ssephe if (bootverbose) { 431302632Ssephe device_printf(sc->vmbus_dev, "gpadl->chan%u " 432302693Ssephe "succeeded\n", channel->ch_id); 433302632Ssephe } 434302609Ssephe } 435302609Ssephe return 0; 436250199Sgrehan} 437250199Sgrehan 438302611Ssephe/* 439302611Ssephe * Disconnect the GPA from the target channel 440250199Sgrehan */ 441250199Sgrehanint 442302611Ssephehv_vmbus_channel_teardown_gpdal(struct hv_vmbus_channel *chan, uint32_t gpadl) 443250199Sgrehan{ 444302611Ssephe struct vmbus_softc *sc = chan->vmbus_sc; 445302611Ssephe struct vmbus_msghc *mh; 446302611Ssephe struct vmbus_chanmsg_gpadl_disconn *req; 447302611Ssephe int error; 448250199Sgrehan 449302611Ssephe mh = vmbus_msghc_get(sc, sizeof(*req)); 450302611Ssephe if (mh == NULL) { 451302611Ssephe device_printf(sc->vmbus_dev, 452302611Ssephe "can not get msg hypercall for gpa x->chan%u\n", 453302693Ssephe chan->ch_id); 454302611Ssephe return EBUSY; 455250199Sgrehan } 456250199Sgrehan 457302611Ssephe req = vmbus_msghc_dataptr(mh); 458302611Ssephe req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN; 459302693Ssephe req->chm_chanid = chan->ch_id; 460302611Ssephe req->chm_gpadl = gpadl; 461250199Sgrehan 462302611Ssephe error = vmbus_msghc_exec(sc, mh); 463302611Ssephe if (error) { 464302611Ssephe device_printf(sc->vmbus_dev, 465302611Ssephe "gpa x->chan%u msg hypercall exec failed: %d\n", 466302693Ssephe chan->ch_id, error); 467302611Ssephe vmbus_msghc_put(sc, mh); 468302611Ssephe return error; 469302611Ssephe } 470250199Sgrehan 471302611Ssephe vmbus_msghc_wait_result(sc, mh); 472302611Ssephe /* Discard result; no useful information */ 473302611Ssephe vmbus_msghc_put(sc, mh); 474250199Sgrehan 475302611Ssephe return 0; 476250199Sgrehan} 477250199Sgrehan 478282212Swhustatic void 479282212Swhuhv_vmbus_channel_close_internal(hv_vmbus_channel *channel) 480250199Sgrehan{ 481302610Ssephe struct vmbus_softc *sc = channel->vmbus_sc; 482302610Ssephe struct vmbus_msghc *mh; 483302610Ssephe struct vmbus_chanmsg_chclose *req; 484294886Ssephe struct taskqueue *rxq = channel->rxq; 485302610Ssephe int error; 486250199Sgrehan 487282212Swhu channel->state = HV_CHANNEL_OPEN_STATE; 488302633Ssephe sysctl_ctx_free(&channel->ch_sysctl_ctx); 489282212Swhu 490282212Swhu /* 491294886Ssephe * set rxq to NULL to avoid more requests be scheduled 492294886Ssephe */ 493294886Ssephe channel->rxq = NULL; 494294886Ssephe taskqueue_drain(rxq, &channel->channel_task); 495250199Sgrehan channel->on_channel_callback = NULL; 496250199Sgrehan 497250199Sgrehan /** 498250199Sgrehan * Send a closing message 499250199Sgrehan */ 500250199Sgrehan 501302610Ssephe mh = vmbus_msghc_get(sc, sizeof(*req)); 502302610Ssephe if (mh == NULL) { 503302610Ssephe device_printf(sc->vmbus_dev, 504302610Ssephe "can not get msg hypercall for chclose(chan%u)\n", 505302693Ssephe channel->ch_id); 506302610Ssephe return; 507302610Ssephe } 508250199Sgrehan 509302610Ssephe req = vmbus_msghc_dataptr(mh); 510302610Ssephe req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; 511302693Ssephe req->chm_chanid = channel->ch_id; 512250199Sgrehan 513302610Ssephe error = vmbus_msghc_exec_noresult(mh); 514302610Ssephe vmbus_msghc_put(sc, mh); 515302610Ssephe 516302610Ssephe if (error) { 517302610Ssephe device_printf(sc->vmbus_dev, 518302610Ssephe "chclose(chan%u) msg hypercall exec failed: %d\n", 519302693Ssephe channel->ch_id, error); 520302610Ssephe return; 521302610Ssephe } else if (bootverbose) { 522302610Ssephe device_printf(sc->vmbus_dev, "close chan%u\n", 523302693Ssephe channel->ch_id); 524302610Ssephe } 525302610Ssephe 526250199Sgrehan /* Tear down the gpadl for the channel's ring buffer */ 527250199Sgrehan if (channel->ring_buffer_gpadl_handle) { 528250199Sgrehan hv_vmbus_channel_teardown_gpdal(channel, 529250199Sgrehan channel->ring_buffer_gpadl_handle); 530250199Sgrehan } 531250199Sgrehan 532250199Sgrehan /* TODO: Send a msg to release the childRelId */ 533250199Sgrehan 534250199Sgrehan /* cleanup the ring buffers for this channel */ 535250199Sgrehan hv_ring_buffer_cleanup(&channel->outbound); 536250199Sgrehan hv_ring_buffer_cleanup(&channel->inbound); 537250199Sgrehan 538256350Sgrehan contigfree(channel->ring_buffer_pages, channel->ring_buffer_size, 539256350Sgrehan M_DEVBUF); 540282212Swhu} 541250199Sgrehan 542282212Swhu/** 543282212Swhu * @brief Close the specified channel 544282212Swhu */ 545282212Swhuvoid 546282212Swhuhv_vmbus_channel_close(hv_vmbus_channel *channel) 547282212Swhu{ 548282212Swhu hv_vmbus_channel* sub_channel; 549282212Swhu 550282212Swhu if (channel->primary_channel != NULL) { 551282212Swhu /* 552282212Swhu * We only close multi-channels when the primary is 553282212Swhu * closed. 554282212Swhu */ 555282212Swhu return; 556282212Swhu } 557282212Swhu 558250199Sgrehan /* 559282212Swhu * Close all multi-channels first. 560250199Sgrehan */ 561282212Swhu TAILQ_FOREACH(sub_channel, &channel->sc_list_anchor, 562282212Swhu sc_list_entry) { 563282212Swhu if (sub_channel->state != HV_CHANNEL_OPENED_STATE) 564282212Swhu continue; 565282212Swhu hv_vmbus_channel_close_internal(sub_channel); 566250199Sgrehan } 567282212Swhu /* 568282212Swhu * Then close the primary channel. 569282212Swhu */ 570282212Swhu hv_vmbus_channel_close_internal(channel); 571250199Sgrehan} 572250199Sgrehan 573250199Sgrehan/** 574250199Sgrehan * @brief Send the specified buffer on the given channel 575250199Sgrehan */ 576250199Sgrehanint 577250199Sgrehanhv_vmbus_channel_send_packet( 578250199Sgrehan hv_vmbus_channel* channel, 579250199Sgrehan void* buffer, 580250199Sgrehan uint32_t buffer_len, 581250199Sgrehan uint64_t request_id, 582250199Sgrehan hv_vmbus_packet_type type, 583250199Sgrehan uint32_t flags) 584250199Sgrehan{ 585250199Sgrehan int ret = 0; 586250199Sgrehan hv_vm_packet_descriptor desc; 587250199Sgrehan uint32_t packet_len; 588250199Sgrehan uint64_t aligned_data; 589250199Sgrehan uint32_t packet_len_aligned; 590282212Swhu boolean_t need_sig; 591250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 592250199Sgrehan 593250199Sgrehan packet_len = sizeof(hv_vm_packet_descriptor) + buffer_len; 594250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 595250199Sgrehan aligned_data = 0; 596250199Sgrehan 597250199Sgrehan /* Setup the descriptor */ 598250199Sgrehan desc.type = type; /* HV_VMBUS_PACKET_TYPE_DATA_IN_BAND; */ 599250199Sgrehan desc.flags = flags; /* HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED */ 600250199Sgrehan /* in 8-bytes granularity */ 601250199Sgrehan desc.data_offset8 = sizeof(hv_vm_packet_descriptor) >> 3; 602250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 603250199Sgrehan desc.transaction_id = request_id; 604250199Sgrehan 605250199Sgrehan buffer_list[0].data = &desc; 606250199Sgrehan buffer_list[0].length = sizeof(hv_vm_packet_descriptor); 607250199Sgrehan 608250199Sgrehan buffer_list[1].data = buffer; 609250199Sgrehan buffer_list[1].length = buffer_len; 610250199Sgrehan 611250199Sgrehan buffer_list[2].data = &aligned_data; 612250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 613250199Sgrehan 614282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 615282212Swhu &need_sig); 616250199Sgrehan 617250199Sgrehan /* TODO: We should determine if this is optional */ 618282212Swhu if (ret == 0 && need_sig) { 619250199Sgrehan vmbus_channel_set_event(channel); 620250199Sgrehan } 621250199Sgrehan 622250199Sgrehan return (ret); 623250199Sgrehan} 624250199Sgrehan 625250199Sgrehan/** 626250199Sgrehan * @brief Send a range of single-page buffer packets using 627250199Sgrehan * a GPADL Direct packet type 628250199Sgrehan */ 629250199Sgrehanint 630250199Sgrehanhv_vmbus_channel_send_packet_pagebuffer( 631250199Sgrehan hv_vmbus_channel* channel, 632250199Sgrehan hv_vmbus_page_buffer page_buffers[], 633250199Sgrehan uint32_t page_count, 634250199Sgrehan void* buffer, 635250199Sgrehan uint32_t buffer_len, 636250199Sgrehan uint64_t request_id) 637250199Sgrehan{ 638250199Sgrehan 639250199Sgrehan int ret = 0; 640282212Swhu boolean_t need_sig; 641250199Sgrehan uint32_t packet_len; 642294705Ssephe uint32_t page_buflen; 643250199Sgrehan uint32_t packetLen_aligned; 644294705Ssephe hv_vmbus_sg_buffer_list buffer_list[4]; 645250199Sgrehan hv_vmbus_channel_packet_page_buffer desc; 646250199Sgrehan uint32_t descSize; 647250199Sgrehan uint64_t alignedData = 0; 648250199Sgrehan 649250199Sgrehan if (page_count > HV_MAX_PAGE_BUFFER_COUNT) 650250199Sgrehan return (EINVAL); 651250199Sgrehan 652250199Sgrehan /* 653250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_page_buffer 654250199Sgrehan * is the largest size we support 655250199Sgrehan */ 656294705Ssephe descSize = __offsetof(hv_vmbus_channel_packet_page_buffer, range); 657294705Ssephe page_buflen = sizeof(hv_vmbus_page_buffer) * page_count; 658294705Ssephe packet_len = descSize + page_buflen + buffer_len; 659250199Sgrehan packetLen_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 660250199Sgrehan 661250199Sgrehan /* Setup the descriptor */ 662250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 663250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 664294705Ssephe /* in 8-bytes granularity */ 665294705Ssephe desc.data_offset8 = (descSize + page_buflen) >> 3; 666250199Sgrehan desc.length8 = (uint16_t) (packetLen_aligned >> 3); 667250199Sgrehan desc.transaction_id = request_id; 668250199Sgrehan desc.range_count = page_count; 669250199Sgrehan 670250199Sgrehan buffer_list[0].data = &desc; 671250199Sgrehan buffer_list[0].length = descSize; 672250199Sgrehan 673294705Ssephe buffer_list[1].data = page_buffers; 674294705Ssephe buffer_list[1].length = page_buflen; 675250199Sgrehan 676294705Ssephe buffer_list[2].data = buffer; 677294705Ssephe buffer_list[2].length = buffer_len; 678250199Sgrehan 679294705Ssephe buffer_list[3].data = &alignedData; 680294705Ssephe buffer_list[3].length = packetLen_aligned - packet_len; 681294705Ssephe 682294705Ssephe ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 4, 683282212Swhu &need_sig); 684250199Sgrehan 685250199Sgrehan /* TODO: We should determine if this is optional */ 686282212Swhu if (ret == 0 && need_sig) { 687250199Sgrehan vmbus_channel_set_event(channel); 688250199Sgrehan } 689250199Sgrehan 690250199Sgrehan return (ret); 691250199Sgrehan} 692250199Sgrehan 693250199Sgrehan/** 694250199Sgrehan * @brief Send a multi-page buffer packet using a GPADL Direct packet type 695250199Sgrehan */ 696250199Sgrehanint 697250199Sgrehanhv_vmbus_channel_send_packet_multipagebuffer( 698250199Sgrehan hv_vmbus_channel* channel, 699250199Sgrehan hv_vmbus_multipage_buffer* multi_page_buffer, 700250199Sgrehan void* buffer, 701250199Sgrehan uint32_t buffer_len, 702250199Sgrehan uint64_t request_id) 703250199Sgrehan{ 704250199Sgrehan 705250199Sgrehan int ret = 0; 706250199Sgrehan uint32_t desc_size; 707282212Swhu boolean_t need_sig; 708250199Sgrehan uint32_t packet_len; 709250199Sgrehan uint32_t packet_len_aligned; 710250199Sgrehan uint32_t pfn_count; 711250199Sgrehan uint64_t aligned_data = 0; 712250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 713250199Sgrehan hv_vmbus_channel_packet_multipage_buffer desc; 714250199Sgrehan 715250199Sgrehan pfn_count = 716250199Sgrehan HV_NUM_PAGES_SPANNED( 717250199Sgrehan multi_page_buffer->offset, 718250199Sgrehan multi_page_buffer->length); 719250199Sgrehan 720250199Sgrehan if ((pfn_count == 0) || (pfn_count > HV_MAX_MULTIPAGE_BUFFER_COUNT)) 721250199Sgrehan return (EINVAL); 722250199Sgrehan /* 723250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_multipage_buffer 724250199Sgrehan * is the largest size we support 725250199Sgrehan */ 726250199Sgrehan desc_size = 727250199Sgrehan sizeof(hv_vmbus_channel_packet_multipage_buffer) - 728250199Sgrehan ((HV_MAX_MULTIPAGE_BUFFER_COUNT - pfn_count) * 729250199Sgrehan sizeof(uint64_t)); 730250199Sgrehan packet_len = desc_size + buffer_len; 731250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 732250199Sgrehan 733250199Sgrehan /* 734250199Sgrehan * Setup the descriptor 735250199Sgrehan */ 736250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 737250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 738250199Sgrehan desc.data_offset8 = desc_size >> 3; /* in 8-bytes granularity */ 739250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 740250199Sgrehan desc.transaction_id = request_id; 741250199Sgrehan desc.range_count = 1; 742250199Sgrehan 743250199Sgrehan desc.range.length = multi_page_buffer->length; 744250199Sgrehan desc.range.offset = multi_page_buffer->offset; 745250199Sgrehan 746250199Sgrehan memcpy(desc.range.pfn_array, multi_page_buffer->pfn_array, 747250199Sgrehan pfn_count * sizeof(uint64_t)); 748250199Sgrehan 749250199Sgrehan buffer_list[0].data = &desc; 750250199Sgrehan buffer_list[0].length = desc_size; 751250199Sgrehan 752250199Sgrehan buffer_list[1].data = buffer; 753250199Sgrehan buffer_list[1].length = buffer_len; 754250199Sgrehan 755250199Sgrehan buffer_list[2].data = &aligned_data; 756250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 757250199Sgrehan 758282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 759282212Swhu &need_sig); 760250199Sgrehan 761250199Sgrehan /* TODO: We should determine if this is optional */ 762282212Swhu if (ret == 0 && need_sig) { 763250199Sgrehan vmbus_channel_set_event(channel); 764250199Sgrehan } 765250199Sgrehan 766250199Sgrehan return (ret); 767250199Sgrehan} 768250199Sgrehan 769250199Sgrehan/** 770250199Sgrehan * @brief Retrieve the user packet on the specified channel 771250199Sgrehan */ 772250199Sgrehanint 773250199Sgrehanhv_vmbus_channel_recv_packet( 774250199Sgrehan hv_vmbus_channel* channel, 775250199Sgrehan void* Buffer, 776250199Sgrehan uint32_t buffer_len, 777250199Sgrehan uint32_t* buffer_actual_len, 778250199Sgrehan uint64_t* request_id) 779250199Sgrehan{ 780250199Sgrehan int ret; 781250199Sgrehan uint32_t user_len; 782250199Sgrehan uint32_t packet_len; 783250199Sgrehan hv_vm_packet_descriptor desc; 784250199Sgrehan 785250199Sgrehan *buffer_actual_len = 0; 786250199Sgrehan *request_id = 0; 787250199Sgrehan 788250199Sgrehan ret = hv_ring_buffer_peek(&channel->inbound, &desc, 789250199Sgrehan sizeof(hv_vm_packet_descriptor)); 790250199Sgrehan if (ret != 0) 791250199Sgrehan return (0); 792250199Sgrehan 793250199Sgrehan packet_len = desc.length8 << 3; 794250199Sgrehan user_len = packet_len - (desc.data_offset8 << 3); 795250199Sgrehan 796250199Sgrehan *buffer_actual_len = user_len; 797250199Sgrehan 798250199Sgrehan if (user_len > buffer_len) 799250199Sgrehan return (EINVAL); 800250199Sgrehan 801250199Sgrehan *request_id = desc.transaction_id; 802250199Sgrehan 803250199Sgrehan /* Copy over the packet to the user buffer */ 804250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, Buffer, user_len, 805250199Sgrehan (desc.data_offset8 << 3)); 806250199Sgrehan 807250199Sgrehan return (0); 808250199Sgrehan} 809250199Sgrehan 810250199Sgrehan/** 811250199Sgrehan * @brief Retrieve the raw packet on the specified channel 812250199Sgrehan */ 813250199Sgrehanint 814250199Sgrehanhv_vmbus_channel_recv_packet_raw( 815250199Sgrehan hv_vmbus_channel* channel, 816250199Sgrehan void* buffer, 817250199Sgrehan uint32_t buffer_len, 818250199Sgrehan uint32_t* buffer_actual_len, 819250199Sgrehan uint64_t* request_id) 820250199Sgrehan{ 821250199Sgrehan int ret; 822250199Sgrehan uint32_t packetLen; 823250199Sgrehan hv_vm_packet_descriptor desc; 824250199Sgrehan 825250199Sgrehan *buffer_actual_len = 0; 826250199Sgrehan *request_id = 0; 827250199Sgrehan 828250199Sgrehan ret = hv_ring_buffer_peek( 829250199Sgrehan &channel->inbound, &desc, 830250199Sgrehan sizeof(hv_vm_packet_descriptor)); 831250199Sgrehan 832250199Sgrehan if (ret != 0) 833250199Sgrehan return (0); 834250199Sgrehan 835250199Sgrehan packetLen = desc.length8 << 3; 836250199Sgrehan *buffer_actual_len = packetLen; 837250199Sgrehan 838250199Sgrehan if (packetLen > buffer_len) 839250199Sgrehan return (ENOBUFS); 840250199Sgrehan 841250199Sgrehan *request_id = desc.transaction_id; 842250199Sgrehan 843250199Sgrehan /* Copy over the entire packet to the user buffer */ 844250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0); 845250199Sgrehan 846250199Sgrehan return (0); 847250199Sgrehan} 848294886Ssephe 849294886Ssephe 850294886Ssephe/** 851294886Ssephe * Process a channel event notification 852294886Ssephe */ 853294886Ssephestatic void 854294886SsepheVmbusProcessChannelEvent(void* context, int pending) 855294886Ssephe{ 856294886Ssephe void* arg; 857294886Ssephe uint32_t bytes_to_read; 858294886Ssephe hv_vmbus_channel* channel = (hv_vmbus_channel*)context; 859294886Ssephe boolean_t is_batched_reading; 860294886Ssephe 861294886Ssephe if (channel->on_channel_callback != NULL) { 862294886Ssephe arg = channel->channel_callback_context; 863294886Ssephe is_batched_reading = channel->batched_reading; 864294886Ssephe /* 865294886Ssephe * Optimize host to guest signaling by ensuring: 866294886Ssephe * 1. While reading the channel, we disable interrupts from 867294886Ssephe * host. 868294886Ssephe * 2. Ensure that we process all posted messages from the host 869294886Ssephe * before returning from this callback. 870294886Ssephe * 3. Once we return, enable signaling from the host. Once this 871294886Ssephe * state is set we check to see if additional packets are 872294886Ssephe * available to read. In this case we repeat the process. 873294886Ssephe */ 874294886Ssephe do { 875294886Ssephe if (is_batched_reading) 876294886Ssephe hv_ring_buffer_read_begin(&channel->inbound); 877294886Ssephe 878294886Ssephe channel->on_channel_callback(arg); 879294886Ssephe 880294886Ssephe if (is_batched_reading) 881294886Ssephe bytes_to_read = 882294886Ssephe hv_ring_buffer_read_end(&channel->inbound); 883294886Ssephe else 884294886Ssephe bytes_to_read = 0; 885294886Ssephe } while (is_batched_reading && (bytes_to_read != 0)); 886294886Ssephe } 887294886Ssephe} 888302692Ssephe 889302692Ssephestatic __inline void 890302692Ssephevmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags, 891302692Ssephe int flag_cnt) 892302692Ssephe{ 893302692Ssephe int f; 894302692Ssephe 895302692Ssephe for (f = 0; f < flag_cnt; ++f) { 896302692Ssephe uint32_t rel_id_base; 897302692Ssephe u_long flags; 898302692Ssephe int bit; 899302692Ssephe 900302692Ssephe if (event_flags[f] == 0) 901302692Ssephe continue; 902302692Ssephe 903302692Ssephe flags = atomic_swap_long(&event_flags[f], 0); 904302692Ssephe rel_id_base = f << VMBUS_EVTFLAG_SHIFT; 905302692Ssephe 906302692Ssephe while ((bit = ffsl(flags)) != 0) { 907302692Ssephe struct hv_vmbus_channel *channel; 908302692Ssephe uint32_t rel_id; 909302692Ssephe 910302692Ssephe --bit; /* NOTE: ffsl is 1-based */ 911302692Ssephe flags &= ~(1UL << bit); 912302692Ssephe 913302692Ssephe rel_id = rel_id_base + bit; 914302692Ssephe channel = sc->vmbus_chmap[rel_id]; 915302692Ssephe 916302692Ssephe /* if channel is closed or closing */ 917302692Ssephe if (channel == NULL || channel->rxq == NULL) 918302692Ssephe continue; 919302692Ssephe 920302692Ssephe if (channel->batched_reading) 921302692Ssephe hv_ring_buffer_read_begin(&channel->inbound); 922302692Ssephe taskqueue_enqueue(channel->rxq, &channel->channel_task); 923302692Ssephe } 924302692Ssephe } 925302692Ssephe} 926302692Ssephe 927302692Ssephevoid 928302692Ssephevmbus_event_proc(struct vmbus_softc *sc, int cpu) 929302692Ssephe{ 930302692Ssephe struct vmbus_evtflags *eventf; 931302692Ssephe 932302692Ssephe /* 933302692Ssephe * On Host with Win8 or above, the event page can be checked directly 934302692Ssephe * to get the id of the channel that has the pending interrupt. 935302692Ssephe */ 936302692Ssephe eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 937302692Ssephe vmbus_event_flags_proc(sc, eventf->evt_flags, 938302692Ssephe VMBUS_PCPU_GET(sc, event_flags_cnt, cpu)); 939302692Ssephe} 940302692Ssephe 941302692Ssephevoid 942302692Ssephevmbus_event_proc_compat(struct vmbus_softc *sc, int cpu) 943302692Ssephe{ 944302692Ssephe struct vmbus_evtflags *eventf; 945302692Ssephe 946302692Ssephe eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 947302692Ssephe if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) { 948302692Ssephe vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags, 949302692Ssephe VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT); 950302692Ssephe } 951302692Ssephe} 952302692Ssephe 953302692Ssephestatic void 954302692Ssephevmbus_chan_update_evtflagcnt(struct vmbus_softc *sc, 955302692Ssephe const struct hv_vmbus_channel *chan) 956302692Ssephe{ 957302692Ssephe volatile int *flag_cnt_ptr; 958302692Ssephe int flag_cnt; 959302692Ssephe 960302693Ssephe flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1; 961302692Ssephe flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->target_cpu); 962302692Ssephe 963302692Ssephe for (;;) { 964302692Ssephe int old_flag_cnt; 965302692Ssephe 966302692Ssephe old_flag_cnt = *flag_cnt_ptr; 967302692Ssephe if (old_flag_cnt >= flag_cnt) 968302692Ssephe break; 969302692Ssephe if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) { 970302692Ssephe if (bootverbose) { 971302692Ssephe device_printf(sc->vmbus_dev, 972302692Ssephe "channel%u update cpu%d flag_cnt to %d\n", 973302693Ssephe chan->ch_id, 974302692Ssephe chan->target_cpu, flag_cnt); 975302692Ssephe } 976302692Ssephe break; 977302692Ssephe } 978302692Ssephe } 979302692Ssephe} 980