vmbus_chan.c revision 302726
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 302726 2016-07-13 09:19:33Z 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); 54302692Ssephestatic void vmbus_chan_update_evtflagcnt(struct vmbus_softc *, 55302692Ssephe const struct hv_vmbus_channel *); 56302713Ssephestatic void vmbus_chan_task(void *, int); 57302713Ssephestatic void vmbus_chan_task_nobatch(void *, int); 58250199Sgrehan 59250199Sgrehan/** 60250199Sgrehan * @brief Trigger an event notification on the specified channel 61250199Sgrehan */ 62250199Sgrehanstatic void 63250199Sgrehanvmbus_channel_set_event(hv_vmbus_channel *channel) 64250199Sgrehan{ 65302618Ssephe struct vmbus_softc *sc = channel->vmbus_sc; 66302693Ssephe uint32_t chanid = channel->ch_id; 67302618Ssephe 68302618Ssephe atomic_set_long(&sc->vmbus_tx_evtflags[chanid >> VMBUS_EVTFLAG_SHIFT], 69302618Ssephe 1UL << (chanid & VMBUS_EVTFLAG_MASK)); 70302618Ssephe 71302695Ssephe if (channel->ch_flags & VMBUS_CHAN_FLAG_HASMNF) { 72301583Ssephe hv_vmbus_monitor_page *monitor_page; 73250199Sgrehan 74301583Ssephe monitor_page = sc->vmbus_mnf2; 75250199Sgrehan synch_set_bit(channel->monitor_bit, 76250199Sgrehan (uint32_t *)&monitor_page-> 77256276Sdim trigger_group[channel->monitor_group].u.pending); 78250199Sgrehan } else { 79302726Ssephe hypercall_signal_event(channel->ch_monprm_dma.hv_paddr); 80250199Sgrehan } 81250199Sgrehan 82250199Sgrehan} 83250199Sgrehan 84296289Ssephestatic int 85296289Ssephevmbus_channel_sysctl_monalloc(SYSCTL_HANDLER_ARGS) 86296289Ssephe{ 87296289Ssephe struct hv_vmbus_channel *chan = arg1; 88296289Ssephe int alloc = 0; 89296289Ssephe 90302695Ssephe if (chan->ch_flags & VMBUS_CHAN_FLAG_HASMNF) 91296289Ssephe alloc = 1; 92296289Ssephe return sysctl_handle_int(oidp, &alloc, 0, req); 93296289Ssephe} 94296289Ssephe 95296181Ssephestatic void 96296290Ssephevmbus_channel_sysctl_create(hv_vmbus_channel* channel) 97296181Ssephe{ 98296181Ssephe device_t dev; 99296181Ssephe struct sysctl_oid *devch_sysctl; 100296181Ssephe struct sysctl_oid *devch_id_sysctl, *devch_sub_sysctl; 101296181Ssephe struct sysctl_oid *devch_id_in_sysctl, *devch_id_out_sysctl; 102296181Ssephe struct sysctl_ctx_list *ctx; 103296181Ssephe uint32_t ch_id; 104296181Ssephe uint16_t sub_ch_id; 105296181Ssephe char name[16]; 106296181Ssephe 107296181Ssephe hv_vmbus_channel* primary_ch = channel->primary_channel; 108296181Ssephe 109296181Ssephe if (primary_ch == NULL) { 110302706Ssephe dev = channel->ch_dev; 111302693Ssephe ch_id = channel->ch_id; 112296181Ssephe } else { 113302706Ssephe dev = primary_ch->ch_dev; 114302693Ssephe ch_id = primary_ch->ch_id; 115302694Ssephe sub_ch_id = channel->ch_subidx; 116296181Ssephe } 117302633Ssephe ctx = &channel->ch_sysctl_ctx; 118302633Ssephe sysctl_ctx_init(ctx); 119296181Ssephe /* This creates dev.DEVNAME.DEVUNIT.channel tree */ 120296181Ssephe devch_sysctl = SYSCTL_ADD_NODE(ctx, 121296181Ssephe SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 122298693Ssephe OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 123296181Ssephe /* This creates dev.DEVNAME.DEVUNIT.channel.CHANID tree */ 124296181Ssephe snprintf(name, sizeof(name), "%d", ch_id); 125296181Ssephe devch_id_sysctl = SYSCTL_ADD_NODE(ctx, 126296181Ssephe SYSCTL_CHILDREN(devch_sysctl), 127298693Ssephe OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 128296181Ssephe 129296181Ssephe if (primary_ch != NULL) { 130296181Ssephe devch_sub_sysctl = SYSCTL_ADD_NODE(ctx, 131296181Ssephe SYSCTL_CHILDREN(devch_id_sysctl), 132298693Ssephe OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 133296181Ssephe snprintf(name, sizeof(name), "%d", sub_ch_id); 134296181Ssephe devch_id_sysctl = SYSCTL_ADD_NODE(ctx, 135296181Ssephe SYSCTL_CHILDREN(devch_sub_sysctl), 136298693Ssephe OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 137296188Ssephe 138296188Ssephe SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), 139296188Ssephe OID_AUTO, "chanid", CTLFLAG_RD, 140302693Ssephe &channel->ch_id, 0, "channel id"); 141296181Ssephe } 142296188Ssephe SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, 143296188Ssephe "cpu", CTLFLAG_RD, &channel->target_cpu, 0, "owner CPU id"); 144296289Ssephe SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, 145298693Ssephe "monitor_allocated", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 146298693Ssephe channel, 0, vmbus_channel_sysctl_monalloc, "I", 147296289Ssephe "is monitor allocated to this channel"); 148296188Ssephe 149296181Ssephe devch_id_in_sysctl = SYSCTL_ADD_NODE(ctx, 150296181Ssephe SYSCTL_CHILDREN(devch_id_sysctl), 151296181Ssephe OID_AUTO, 152296181Ssephe "in", 153298693Ssephe CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 154296181Ssephe devch_id_out_sysctl = SYSCTL_ADD_NODE(ctx, 155296181Ssephe SYSCTL_CHILDREN(devch_id_sysctl), 156296181Ssephe OID_AUTO, 157296181Ssephe "out", 158298693Ssephe CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); 159296181Ssephe hv_ring_buffer_stat(ctx, 160296181Ssephe SYSCTL_CHILDREN(devch_id_in_sysctl), 161296181Ssephe &(channel->inbound), 162296181Ssephe "inbound ring buffer stats"); 163296181Ssephe hv_ring_buffer_stat(ctx, 164296181Ssephe SYSCTL_CHILDREN(devch_id_out_sysctl), 165296181Ssephe &(channel->outbound), 166296181Ssephe "outbound ring buffer stats"); 167296181Ssephe} 168296290Ssephe 169250199Sgrehan/** 170250199Sgrehan * @brief Open the specified channel 171250199Sgrehan */ 172250199Sgrehanint 173250199Sgrehanhv_vmbus_channel_open( 174250199Sgrehan hv_vmbus_channel* new_channel, 175250199Sgrehan uint32_t send_ring_buffer_size, 176250199Sgrehan uint32_t recv_ring_buffer_size, 177250199Sgrehan void* user_data, 178250199Sgrehan uint32_t user_data_len, 179250199Sgrehan hv_vmbus_pfn_channel_callback pfn_on_channel_callback, 180250199Sgrehan void* context) 181250199Sgrehan{ 182302607Ssephe struct vmbus_softc *sc = new_channel->vmbus_sc; 183302607Ssephe const struct vmbus_chanmsg_chopen_resp *resp; 184302607Ssephe const struct vmbus_message *msg; 185302607Ssephe struct vmbus_chanmsg_chopen *req; 186302607Ssephe struct vmbus_msghc *mh; 187302607Ssephe uint32_t status; 188250199Sgrehan int ret = 0; 189250199Sgrehan void *in, *out; 190250199Sgrehan 191302607Ssephe if (user_data_len > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) { 192302607Ssephe device_printf(sc->vmbus_dev, 193302607Ssephe "invalid udata len %u for chan%u\n", 194302693Ssephe user_data_len, new_channel->ch_id); 195302607Ssephe return EINVAL; 196302607Ssephe } 197302607Ssephe 198282212Swhu mtx_lock(&new_channel->sc_lock); 199282212Swhu if (new_channel->state == HV_CHANNEL_OPEN_STATE) { 200282212Swhu new_channel->state = HV_CHANNEL_OPENING_STATE; 201282212Swhu } else { 202282212Swhu mtx_unlock(&new_channel->sc_lock); 203282212Swhu if(bootverbose) 204282212Swhu printf("VMBUS: Trying to open channel <%p> which in " 205282212Swhu "%d state.\n", new_channel, new_channel->state); 206282212Swhu return (EINVAL); 207282212Swhu } 208282212Swhu mtx_unlock(&new_channel->sc_lock); 209282212Swhu 210250199Sgrehan new_channel->on_channel_callback = pfn_on_channel_callback; 211250199Sgrehan new_channel->channel_callback_context = context; 212250199Sgrehan 213302692Ssephe vmbus_chan_update_evtflagcnt(sc, new_channel); 214300102Ssephe 215302557Ssephe new_channel->rxq = VMBUS_PCPU_GET(new_channel->vmbus_sc, event_tq, 216300646Ssephe new_channel->target_cpu); 217302713Ssephe if (new_channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) { 218302713Ssephe TASK_INIT(&new_channel->channel_task, 0, 219302713Ssephe vmbus_chan_task, new_channel); 220302713Ssephe } else { 221302713Ssephe TASK_INIT(&new_channel->channel_task, 0, 222302713Ssephe vmbus_chan_task_nobatch, new_channel); 223302713Ssephe } 224294886Ssephe 225250199Sgrehan /* Allocate the ring buffer */ 226250199Sgrehan out = contigmalloc((send_ring_buffer_size + recv_ring_buffer_size), 227256350Sgrehan M_DEVBUF, M_ZERO, 0UL, BUS_SPACE_MAXADDR, PAGE_SIZE, 0); 228250199Sgrehan KASSERT(out != NULL, 229250199Sgrehan ("Error VMBUS: contigmalloc failed to allocate Ring Buffer!")); 230250199Sgrehan if (out == NULL) 231256350Sgrehan return (ENOMEM); 232250199Sgrehan 233250199Sgrehan in = ((uint8_t *) out + send_ring_buffer_size); 234250199Sgrehan 235250199Sgrehan new_channel->ring_buffer_pages = out; 236256350Sgrehan new_channel->ring_buffer_page_count = (send_ring_buffer_size + 237256350Sgrehan recv_ring_buffer_size) >> PAGE_SHIFT; 238256350Sgrehan new_channel->ring_buffer_size = send_ring_buffer_size + 239256350Sgrehan recv_ring_buffer_size; 240250199Sgrehan 241250199Sgrehan hv_vmbus_ring_buffer_init( 242250199Sgrehan &new_channel->outbound, 243250199Sgrehan out, 244250199Sgrehan send_ring_buffer_size); 245250199Sgrehan 246250199Sgrehan hv_vmbus_ring_buffer_init( 247250199Sgrehan &new_channel->inbound, 248250199Sgrehan in, 249250199Sgrehan recv_ring_buffer_size); 250250199Sgrehan 251296290Ssephe /* Create sysctl tree for this channel */ 252296290Ssephe vmbus_channel_sysctl_create(new_channel); 253296181Ssephe 254250199Sgrehan /** 255250199Sgrehan * Establish the gpadl for the ring buffer 256250199Sgrehan */ 257250199Sgrehan new_channel->ring_buffer_gpadl_handle = 0; 258250199Sgrehan 259250199Sgrehan ret = hv_vmbus_channel_establish_gpadl(new_channel, 260250199Sgrehan new_channel->outbound.ring_buffer, 261250199Sgrehan send_ring_buffer_size + recv_ring_buffer_size, 262250199Sgrehan &new_channel->ring_buffer_gpadl_handle); 263250199Sgrehan 264302607Ssephe /* 265302607Ssephe * Open channel w/ the bufring GPADL on the target CPU. 266250199Sgrehan */ 267302607Ssephe mh = vmbus_msghc_get(sc, sizeof(*req)); 268302607Ssephe if (mh == NULL) { 269302607Ssephe device_printf(sc->vmbus_dev, 270302607Ssephe "can not get msg hypercall for chopen(chan%u)\n", 271302693Ssephe new_channel->ch_id); 272302607Ssephe return ENXIO; 273302607Ssephe } 274250199Sgrehan 275302607Ssephe req = vmbus_msghc_dataptr(mh); 276302607Ssephe req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN; 277302693Ssephe req->chm_chanid = new_channel->ch_id; 278302693Ssephe req->chm_openid = new_channel->ch_id; 279302607Ssephe req->chm_gpadl = new_channel->ring_buffer_gpadl_handle; 280302607Ssephe req->chm_vcpuid = new_channel->target_vcpu; 281302607Ssephe req->chm_rxbr_pgofs = send_ring_buffer_size >> PAGE_SHIFT; 282250199Sgrehan if (user_data_len) 283302607Ssephe memcpy(req->chm_udata, user_data, user_data_len); 284250199Sgrehan 285302607Ssephe ret = vmbus_msghc_exec(sc, mh); 286302607Ssephe if (ret != 0) { 287302607Ssephe device_printf(sc->vmbus_dev, 288302607Ssephe "chopen(chan%u) msg hypercall exec failed: %d\n", 289302693Ssephe new_channel->ch_id, ret); 290302607Ssephe vmbus_msghc_put(sc, mh); 291302607Ssephe return ret; 292302607Ssephe } 293250199Sgrehan 294302607Ssephe msg = vmbus_msghc_wait_result(sc, mh); 295302607Ssephe resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data; 296302607Ssephe status = resp->chm_status; 297250199Sgrehan 298302607Ssephe vmbus_msghc_put(sc, mh); 299250199Sgrehan 300302607Ssephe if (status == 0) { 301302607Ssephe new_channel->state = HV_CHANNEL_OPENED_STATE; 302302607Ssephe if (bootverbose) { 303302607Ssephe device_printf(sc->vmbus_dev, "chan%u opened\n", 304302693Ssephe new_channel->ch_id); 305302607Ssephe } 306250199Sgrehan } else { 307302607Ssephe device_printf(sc->vmbus_dev, "failed to open chan%u\n", 308302693Ssephe new_channel->ch_id); 309302607Ssephe ret = ENXIO; 310250199Sgrehan } 311250199Sgrehan return (ret); 312250199Sgrehan} 313250199Sgrehan 314250199Sgrehan/** 315302609Ssephe * @brief Establish a GPADL for the specified buffer 316250199Sgrehan */ 317302609Ssepheint 318302609Ssephehv_vmbus_channel_establish_gpadl(struct hv_vmbus_channel *channel, 319302609Ssephe void *contig_buffer, uint32_t size, uint32_t *gpadl0) 320250199Sgrehan{ 321302609Ssephe struct vmbus_softc *sc = channel->vmbus_sc; 322302609Ssephe struct vmbus_msghc *mh; 323302609Ssephe struct vmbus_chanmsg_gpadl_conn *req; 324302609Ssephe const struct vmbus_message *msg; 325302609Ssephe size_t reqsz; 326302609Ssephe uint32_t gpadl, status; 327302609Ssephe int page_count, range_len, i, cnt, error; 328302609Ssephe uint64_t page_id, paddr; 329250199Sgrehan 330302609Ssephe /* 331302609Ssephe * Preliminary checks. 332302609Ssephe */ 333250199Sgrehan 334302609Ssephe KASSERT((size & PAGE_MASK) == 0, 335302609Ssephe ("invalid GPA size %u, not multiple page size", size)); 336250199Sgrehan page_count = size >> PAGE_SHIFT; 337250199Sgrehan 338302609Ssephe paddr = hv_get_phys_addr(contig_buffer); 339302609Ssephe KASSERT((paddr & PAGE_MASK) == 0, 340302609Ssephe ("GPA is not page aligned %jx", (uintmax_t)paddr)); 341302609Ssephe page_id = paddr >> PAGE_SHIFT; 342250199Sgrehan 343302609Ssephe range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); 344302609Ssephe /* 345302609Ssephe * We don't support multiple GPA ranges. 346302609Ssephe */ 347302609Ssephe if (range_len > UINT16_MAX) { 348302609Ssephe device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", 349302609Ssephe page_count); 350302609Ssephe return EOPNOTSUPP; 351250199Sgrehan } 352250199Sgrehan 353302609Ssephe /* 354302609Ssephe * Allocate GPADL id. 355302609Ssephe */ 356302630Ssephe gpadl = vmbus_gpadl_alloc(sc); 357302609Ssephe *gpadl0 = gpadl; 358250199Sgrehan 359302609Ssephe /* 360302609Ssephe * Connect this GPADL to the target channel. 361302609Ssephe * 362302609Ssephe * NOTE: 363302609Ssephe * Since each message can only hold small set of page 364302609Ssephe * addresses, several messages may be required to 365302609Ssephe * complete the connection. 366302609Ssephe */ 367302609Ssephe if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) 368302609Ssephe cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; 369302609Ssephe else 370302609Ssephe cnt = page_count; 371302609Ssephe page_count -= cnt; 372250199Sgrehan 373302609Ssephe reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, 374302609Ssephe chm_range.gpa_page[cnt]); 375302609Ssephe mh = vmbus_msghc_get(sc, reqsz); 376302609Ssephe if (mh == NULL) { 377302609Ssephe device_printf(sc->vmbus_dev, 378302609Ssephe "can not get msg hypercall for gpadl->chan%u\n", 379302693Ssephe channel->ch_id); 380302609Ssephe return EIO; 381250199Sgrehan } 382250199Sgrehan 383302609Ssephe req = vmbus_msghc_dataptr(mh); 384302609Ssephe req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN; 385302693Ssephe req->chm_chanid = channel->ch_id; 386302609Ssephe req->chm_gpadl = gpadl; 387302609Ssephe req->chm_range_len = range_len; 388302609Ssephe req->chm_range_cnt = 1; 389302609Ssephe req->chm_range.gpa_len = size; 390302609Ssephe req->chm_range.gpa_ofs = 0; 391302609Ssephe for (i = 0; i < cnt; ++i) 392302609Ssephe req->chm_range.gpa_page[i] = page_id++; 393250199Sgrehan 394302609Ssephe error = vmbus_msghc_exec(sc, mh); 395302609Ssephe if (error) { 396302609Ssephe device_printf(sc->vmbus_dev, 397302609Ssephe "gpadl->chan%u msg hypercall exec failed: %d\n", 398302693Ssephe channel->ch_id, error); 399302609Ssephe vmbus_msghc_put(sc, mh); 400302609Ssephe return error; 401302609Ssephe } 402250199Sgrehan 403302609Ssephe while (page_count > 0) { 404302609Ssephe struct vmbus_chanmsg_gpadl_subconn *subreq; 405250199Sgrehan 406302609Ssephe if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) 407302609Ssephe cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; 408302609Ssephe else 409302609Ssephe cnt = page_count; 410302609Ssephe page_count -= cnt; 411250199Sgrehan 412302609Ssephe reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, 413302609Ssephe chm_gpa_page[cnt]); 414302609Ssephe vmbus_msghc_reset(mh, reqsz); 415250199Sgrehan 416302609Ssephe subreq = vmbus_msghc_dataptr(mh); 417302609Ssephe subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN; 418302609Ssephe subreq->chm_gpadl = gpadl; 419302609Ssephe for (i = 0; i < cnt; ++i) 420302609Ssephe subreq->chm_gpa_page[i] = page_id++; 421250199Sgrehan 422302609Ssephe vmbus_msghc_exec_noresult(mh); 423250199Sgrehan } 424302609Ssephe KASSERT(page_count == 0, ("invalid page count %d", page_count)); 425250199Sgrehan 426302609Ssephe msg = vmbus_msghc_wait_result(sc, mh); 427302609Ssephe status = ((const struct vmbus_chanmsg_gpadl_connresp *) 428302609Ssephe msg->msg_data)->chm_status; 429250199Sgrehan 430302609Ssephe vmbus_msghc_put(sc, mh); 431250199Sgrehan 432302609Ssephe if (status != 0) { 433302609Ssephe device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " 434302693Ssephe "status %u\n", channel->ch_id, status); 435302609Ssephe return EIO; 436302632Ssephe } else { 437302632Ssephe if (bootverbose) { 438302632Ssephe device_printf(sc->vmbus_dev, "gpadl->chan%u " 439302693Ssephe "succeeded\n", channel->ch_id); 440302632Ssephe } 441302609Ssephe } 442302609Ssephe return 0; 443250199Sgrehan} 444250199Sgrehan 445302611Ssephe/* 446302611Ssephe * Disconnect the GPA from the target channel 447250199Sgrehan */ 448250199Sgrehanint 449302611Ssephehv_vmbus_channel_teardown_gpdal(struct hv_vmbus_channel *chan, uint32_t gpadl) 450250199Sgrehan{ 451302611Ssephe struct vmbus_softc *sc = chan->vmbus_sc; 452302611Ssephe struct vmbus_msghc *mh; 453302611Ssephe struct vmbus_chanmsg_gpadl_disconn *req; 454302611Ssephe int error; 455250199Sgrehan 456302611Ssephe mh = vmbus_msghc_get(sc, sizeof(*req)); 457302611Ssephe if (mh == NULL) { 458302611Ssephe device_printf(sc->vmbus_dev, 459302611Ssephe "can not get msg hypercall for gpa x->chan%u\n", 460302693Ssephe chan->ch_id); 461302611Ssephe return EBUSY; 462250199Sgrehan } 463250199Sgrehan 464302611Ssephe req = vmbus_msghc_dataptr(mh); 465302611Ssephe req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN; 466302693Ssephe req->chm_chanid = chan->ch_id; 467302611Ssephe req->chm_gpadl = gpadl; 468250199Sgrehan 469302611Ssephe error = vmbus_msghc_exec(sc, mh); 470302611Ssephe if (error) { 471302611Ssephe device_printf(sc->vmbus_dev, 472302611Ssephe "gpa x->chan%u msg hypercall exec failed: %d\n", 473302693Ssephe chan->ch_id, error); 474302611Ssephe vmbus_msghc_put(sc, mh); 475302611Ssephe return error; 476302611Ssephe } 477250199Sgrehan 478302611Ssephe vmbus_msghc_wait_result(sc, mh); 479302611Ssephe /* Discard result; no useful information */ 480302611Ssephe vmbus_msghc_put(sc, mh); 481250199Sgrehan 482302611Ssephe return 0; 483250199Sgrehan} 484250199Sgrehan 485282212Swhustatic void 486282212Swhuhv_vmbus_channel_close_internal(hv_vmbus_channel *channel) 487250199Sgrehan{ 488302610Ssephe struct vmbus_softc *sc = channel->vmbus_sc; 489302610Ssephe struct vmbus_msghc *mh; 490302610Ssephe struct vmbus_chanmsg_chclose *req; 491294886Ssephe struct taskqueue *rxq = channel->rxq; 492302610Ssephe int error; 493250199Sgrehan 494282212Swhu channel->state = HV_CHANNEL_OPEN_STATE; 495302633Ssephe sysctl_ctx_free(&channel->ch_sysctl_ctx); 496282212Swhu 497282212Swhu /* 498294886Ssephe * set rxq to NULL to avoid more requests be scheduled 499294886Ssephe */ 500294886Ssephe channel->rxq = NULL; 501294886Ssephe taskqueue_drain(rxq, &channel->channel_task); 502250199Sgrehan channel->on_channel_callback = NULL; 503250199Sgrehan 504250199Sgrehan /** 505250199Sgrehan * Send a closing message 506250199Sgrehan */ 507250199Sgrehan 508302610Ssephe mh = vmbus_msghc_get(sc, sizeof(*req)); 509302610Ssephe if (mh == NULL) { 510302610Ssephe device_printf(sc->vmbus_dev, 511302610Ssephe "can not get msg hypercall for chclose(chan%u)\n", 512302693Ssephe channel->ch_id); 513302610Ssephe return; 514302610Ssephe } 515250199Sgrehan 516302610Ssephe req = vmbus_msghc_dataptr(mh); 517302610Ssephe req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; 518302693Ssephe req->chm_chanid = channel->ch_id; 519250199Sgrehan 520302610Ssephe error = vmbus_msghc_exec_noresult(mh); 521302610Ssephe vmbus_msghc_put(sc, mh); 522302610Ssephe 523302610Ssephe if (error) { 524302610Ssephe device_printf(sc->vmbus_dev, 525302610Ssephe "chclose(chan%u) msg hypercall exec failed: %d\n", 526302693Ssephe channel->ch_id, error); 527302610Ssephe return; 528302610Ssephe } else if (bootverbose) { 529302610Ssephe device_printf(sc->vmbus_dev, "close chan%u\n", 530302693Ssephe channel->ch_id); 531302610Ssephe } 532302610Ssephe 533250199Sgrehan /* Tear down the gpadl for the channel's ring buffer */ 534250199Sgrehan if (channel->ring_buffer_gpadl_handle) { 535250199Sgrehan hv_vmbus_channel_teardown_gpdal(channel, 536250199Sgrehan channel->ring_buffer_gpadl_handle); 537250199Sgrehan } 538250199Sgrehan 539250199Sgrehan /* TODO: Send a msg to release the childRelId */ 540250199Sgrehan 541250199Sgrehan /* cleanup the ring buffers for this channel */ 542250199Sgrehan hv_ring_buffer_cleanup(&channel->outbound); 543250199Sgrehan hv_ring_buffer_cleanup(&channel->inbound); 544250199Sgrehan 545256350Sgrehan contigfree(channel->ring_buffer_pages, channel->ring_buffer_size, 546256350Sgrehan M_DEVBUF); 547282212Swhu} 548250199Sgrehan 549282212Swhu/** 550282212Swhu * @brief Close the specified channel 551282212Swhu */ 552282212Swhuvoid 553282212Swhuhv_vmbus_channel_close(hv_vmbus_channel *channel) 554282212Swhu{ 555282212Swhu hv_vmbus_channel* sub_channel; 556282212Swhu 557282212Swhu if (channel->primary_channel != NULL) { 558282212Swhu /* 559282212Swhu * We only close multi-channels when the primary is 560282212Swhu * closed. 561282212Swhu */ 562282212Swhu return; 563282212Swhu } 564282212Swhu 565250199Sgrehan /* 566282212Swhu * Close all multi-channels first. 567250199Sgrehan */ 568282212Swhu TAILQ_FOREACH(sub_channel, &channel->sc_list_anchor, 569282212Swhu sc_list_entry) { 570282212Swhu if (sub_channel->state != HV_CHANNEL_OPENED_STATE) 571282212Swhu continue; 572282212Swhu hv_vmbus_channel_close_internal(sub_channel); 573250199Sgrehan } 574282212Swhu /* 575282212Swhu * Then close the primary channel. 576282212Swhu */ 577282212Swhu hv_vmbus_channel_close_internal(channel); 578250199Sgrehan} 579250199Sgrehan 580250199Sgrehan/** 581250199Sgrehan * @brief Send the specified buffer on the given channel 582250199Sgrehan */ 583250199Sgrehanint 584250199Sgrehanhv_vmbus_channel_send_packet( 585250199Sgrehan hv_vmbus_channel* channel, 586250199Sgrehan void* buffer, 587250199Sgrehan uint32_t buffer_len, 588250199Sgrehan uint64_t request_id, 589250199Sgrehan hv_vmbus_packet_type type, 590250199Sgrehan uint32_t flags) 591250199Sgrehan{ 592250199Sgrehan int ret = 0; 593250199Sgrehan hv_vm_packet_descriptor desc; 594250199Sgrehan uint32_t packet_len; 595250199Sgrehan uint64_t aligned_data; 596250199Sgrehan uint32_t packet_len_aligned; 597282212Swhu boolean_t need_sig; 598250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 599250199Sgrehan 600250199Sgrehan packet_len = sizeof(hv_vm_packet_descriptor) + buffer_len; 601250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 602250199Sgrehan aligned_data = 0; 603250199Sgrehan 604250199Sgrehan /* Setup the descriptor */ 605250199Sgrehan desc.type = type; /* HV_VMBUS_PACKET_TYPE_DATA_IN_BAND; */ 606250199Sgrehan desc.flags = flags; /* HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED */ 607250199Sgrehan /* in 8-bytes granularity */ 608250199Sgrehan desc.data_offset8 = sizeof(hv_vm_packet_descriptor) >> 3; 609250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 610250199Sgrehan desc.transaction_id = request_id; 611250199Sgrehan 612250199Sgrehan buffer_list[0].data = &desc; 613250199Sgrehan buffer_list[0].length = sizeof(hv_vm_packet_descriptor); 614250199Sgrehan 615250199Sgrehan buffer_list[1].data = buffer; 616250199Sgrehan buffer_list[1].length = buffer_len; 617250199Sgrehan 618250199Sgrehan buffer_list[2].data = &aligned_data; 619250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 620250199Sgrehan 621282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 622282212Swhu &need_sig); 623250199Sgrehan 624250199Sgrehan /* TODO: We should determine if this is optional */ 625282212Swhu if (ret == 0 && need_sig) { 626250199Sgrehan vmbus_channel_set_event(channel); 627250199Sgrehan } 628250199Sgrehan 629250199Sgrehan return (ret); 630250199Sgrehan} 631250199Sgrehan 632250199Sgrehan/** 633250199Sgrehan * @brief Send a range of single-page buffer packets using 634250199Sgrehan * a GPADL Direct packet type 635250199Sgrehan */ 636250199Sgrehanint 637250199Sgrehanhv_vmbus_channel_send_packet_pagebuffer( 638250199Sgrehan hv_vmbus_channel* channel, 639250199Sgrehan hv_vmbus_page_buffer page_buffers[], 640250199Sgrehan uint32_t page_count, 641250199Sgrehan void* buffer, 642250199Sgrehan uint32_t buffer_len, 643250199Sgrehan uint64_t request_id) 644250199Sgrehan{ 645250199Sgrehan 646250199Sgrehan int ret = 0; 647282212Swhu boolean_t need_sig; 648250199Sgrehan uint32_t packet_len; 649294705Ssephe uint32_t page_buflen; 650250199Sgrehan uint32_t packetLen_aligned; 651294705Ssephe hv_vmbus_sg_buffer_list buffer_list[4]; 652250199Sgrehan hv_vmbus_channel_packet_page_buffer desc; 653250199Sgrehan uint32_t descSize; 654250199Sgrehan uint64_t alignedData = 0; 655250199Sgrehan 656250199Sgrehan if (page_count > HV_MAX_PAGE_BUFFER_COUNT) 657250199Sgrehan return (EINVAL); 658250199Sgrehan 659250199Sgrehan /* 660250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_page_buffer 661250199Sgrehan * is the largest size we support 662250199Sgrehan */ 663294705Ssephe descSize = __offsetof(hv_vmbus_channel_packet_page_buffer, range); 664294705Ssephe page_buflen = sizeof(hv_vmbus_page_buffer) * page_count; 665294705Ssephe packet_len = descSize + page_buflen + buffer_len; 666250199Sgrehan packetLen_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 667250199Sgrehan 668250199Sgrehan /* Setup the descriptor */ 669250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 670250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 671294705Ssephe /* in 8-bytes granularity */ 672294705Ssephe desc.data_offset8 = (descSize + page_buflen) >> 3; 673250199Sgrehan desc.length8 = (uint16_t) (packetLen_aligned >> 3); 674250199Sgrehan desc.transaction_id = request_id; 675250199Sgrehan desc.range_count = page_count; 676250199Sgrehan 677250199Sgrehan buffer_list[0].data = &desc; 678250199Sgrehan buffer_list[0].length = descSize; 679250199Sgrehan 680294705Ssephe buffer_list[1].data = page_buffers; 681294705Ssephe buffer_list[1].length = page_buflen; 682250199Sgrehan 683294705Ssephe buffer_list[2].data = buffer; 684294705Ssephe buffer_list[2].length = buffer_len; 685250199Sgrehan 686294705Ssephe buffer_list[3].data = &alignedData; 687294705Ssephe buffer_list[3].length = packetLen_aligned - packet_len; 688294705Ssephe 689294705Ssephe ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 4, 690282212Swhu &need_sig); 691250199Sgrehan 692250199Sgrehan /* TODO: We should determine if this is optional */ 693282212Swhu if (ret == 0 && need_sig) { 694250199Sgrehan vmbus_channel_set_event(channel); 695250199Sgrehan } 696250199Sgrehan 697250199Sgrehan return (ret); 698250199Sgrehan} 699250199Sgrehan 700250199Sgrehan/** 701250199Sgrehan * @brief Send a multi-page buffer packet using a GPADL Direct packet type 702250199Sgrehan */ 703250199Sgrehanint 704250199Sgrehanhv_vmbus_channel_send_packet_multipagebuffer( 705250199Sgrehan hv_vmbus_channel* channel, 706250199Sgrehan hv_vmbus_multipage_buffer* multi_page_buffer, 707250199Sgrehan void* buffer, 708250199Sgrehan uint32_t buffer_len, 709250199Sgrehan uint64_t request_id) 710250199Sgrehan{ 711250199Sgrehan 712250199Sgrehan int ret = 0; 713250199Sgrehan uint32_t desc_size; 714282212Swhu boolean_t need_sig; 715250199Sgrehan uint32_t packet_len; 716250199Sgrehan uint32_t packet_len_aligned; 717250199Sgrehan uint32_t pfn_count; 718250199Sgrehan uint64_t aligned_data = 0; 719250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 720250199Sgrehan hv_vmbus_channel_packet_multipage_buffer desc; 721250199Sgrehan 722250199Sgrehan pfn_count = 723250199Sgrehan HV_NUM_PAGES_SPANNED( 724250199Sgrehan multi_page_buffer->offset, 725250199Sgrehan multi_page_buffer->length); 726250199Sgrehan 727250199Sgrehan if ((pfn_count == 0) || (pfn_count > HV_MAX_MULTIPAGE_BUFFER_COUNT)) 728250199Sgrehan return (EINVAL); 729250199Sgrehan /* 730250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_multipage_buffer 731250199Sgrehan * is the largest size we support 732250199Sgrehan */ 733250199Sgrehan desc_size = 734250199Sgrehan sizeof(hv_vmbus_channel_packet_multipage_buffer) - 735250199Sgrehan ((HV_MAX_MULTIPAGE_BUFFER_COUNT - pfn_count) * 736250199Sgrehan sizeof(uint64_t)); 737250199Sgrehan packet_len = desc_size + buffer_len; 738250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 739250199Sgrehan 740250199Sgrehan /* 741250199Sgrehan * Setup the descriptor 742250199Sgrehan */ 743250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 744250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 745250199Sgrehan desc.data_offset8 = desc_size >> 3; /* in 8-bytes granularity */ 746250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 747250199Sgrehan desc.transaction_id = request_id; 748250199Sgrehan desc.range_count = 1; 749250199Sgrehan 750250199Sgrehan desc.range.length = multi_page_buffer->length; 751250199Sgrehan desc.range.offset = multi_page_buffer->offset; 752250199Sgrehan 753250199Sgrehan memcpy(desc.range.pfn_array, multi_page_buffer->pfn_array, 754250199Sgrehan pfn_count * sizeof(uint64_t)); 755250199Sgrehan 756250199Sgrehan buffer_list[0].data = &desc; 757250199Sgrehan buffer_list[0].length = desc_size; 758250199Sgrehan 759250199Sgrehan buffer_list[1].data = buffer; 760250199Sgrehan buffer_list[1].length = buffer_len; 761250199Sgrehan 762250199Sgrehan buffer_list[2].data = &aligned_data; 763250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 764250199Sgrehan 765282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 766282212Swhu &need_sig); 767250199Sgrehan 768250199Sgrehan /* TODO: We should determine if this is optional */ 769282212Swhu if (ret == 0 && need_sig) { 770250199Sgrehan vmbus_channel_set_event(channel); 771250199Sgrehan } 772250199Sgrehan 773250199Sgrehan return (ret); 774250199Sgrehan} 775250199Sgrehan 776250199Sgrehan/** 777250199Sgrehan * @brief Retrieve the user packet on the specified channel 778250199Sgrehan */ 779250199Sgrehanint 780250199Sgrehanhv_vmbus_channel_recv_packet( 781250199Sgrehan hv_vmbus_channel* channel, 782250199Sgrehan void* Buffer, 783250199Sgrehan uint32_t buffer_len, 784250199Sgrehan uint32_t* buffer_actual_len, 785250199Sgrehan uint64_t* request_id) 786250199Sgrehan{ 787250199Sgrehan int ret; 788250199Sgrehan uint32_t user_len; 789250199Sgrehan uint32_t packet_len; 790250199Sgrehan hv_vm_packet_descriptor desc; 791250199Sgrehan 792250199Sgrehan *buffer_actual_len = 0; 793250199Sgrehan *request_id = 0; 794250199Sgrehan 795250199Sgrehan ret = hv_ring_buffer_peek(&channel->inbound, &desc, 796250199Sgrehan sizeof(hv_vm_packet_descriptor)); 797250199Sgrehan if (ret != 0) 798250199Sgrehan return (0); 799250199Sgrehan 800250199Sgrehan packet_len = desc.length8 << 3; 801250199Sgrehan user_len = packet_len - (desc.data_offset8 << 3); 802250199Sgrehan 803250199Sgrehan *buffer_actual_len = user_len; 804250199Sgrehan 805250199Sgrehan if (user_len > buffer_len) 806250199Sgrehan return (EINVAL); 807250199Sgrehan 808250199Sgrehan *request_id = desc.transaction_id; 809250199Sgrehan 810250199Sgrehan /* Copy over the packet to the user buffer */ 811250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, Buffer, user_len, 812250199Sgrehan (desc.data_offset8 << 3)); 813250199Sgrehan 814250199Sgrehan return (0); 815250199Sgrehan} 816250199Sgrehan 817250199Sgrehan/** 818250199Sgrehan * @brief Retrieve the raw packet on the specified channel 819250199Sgrehan */ 820250199Sgrehanint 821250199Sgrehanhv_vmbus_channel_recv_packet_raw( 822250199Sgrehan hv_vmbus_channel* channel, 823250199Sgrehan void* buffer, 824250199Sgrehan uint32_t buffer_len, 825250199Sgrehan uint32_t* buffer_actual_len, 826250199Sgrehan uint64_t* request_id) 827250199Sgrehan{ 828250199Sgrehan int ret; 829250199Sgrehan uint32_t packetLen; 830250199Sgrehan hv_vm_packet_descriptor desc; 831250199Sgrehan 832250199Sgrehan *buffer_actual_len = 0; 833250199Sgrehan *request_id = 0; 834250199Sgrehan 835250199Sgrehan ret = hv_ring_buffer_peek( 836250199Sgrehan &channel->inbound, &desc, 837250199Sgrehan sizeof(hv_vm_packet_descriptor)); 838250199Sgrehan 839250199Sgrehan if (ret != 0) 840250199Sgrehan return (0); 841250199Sgrehan 842250199Sgrehan packetLen = desc.length8 << 3; 843250199Sgrehan *buffer_actual_len = packetLen; 844250199Sgrehan 845250199Sgrehan if (packetLen > buffer_len) 846250199Sgrehan return (ENOBUFS); 847250199Sgrehan 848250199Sgrehan *request_id = desc.transaction_id; 849250199Sgrehan 850250199Sgrehan /* Copy over the entire packet to the user buffer */ 851250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0); 852250199Sgrehan 853250199Sgrehan return (0); 854250199Sgrehan} 855294886Ssephe 856294886Ssephestatic void 857302713Ssephevmbus_chan_task(void *xchan, int pending __unused) 858294886Ssephe{ 859302713Ssephe struct hv_vmbus_channel *chan = xchan; 860302713Ssephe void (*callback)(void *); 861302713Ssephe void *arg; 862294886Ssephe 863302713Ssephe arg = chan->channel_callback_context; 864302713Ssephe callback = chan->on_channel_callback; 865302709Ssephe 866302710Ssephe /* 867302710Ssephe * Optimize host to guest signaling by ensuring: 868302710Ssephe * 1. While reading the channel, we disable interrupts from 869302710Ssephe * host. 870302710Ssephe * 2. Ensure that we process all posted messages from the host 871302710Ssephe * before returning from this callback. 872302710Ssephe * 3. Once we return, enable signaling from the host. Once this 873302710Ssephe * state is set we check to see if additional packets are 874302710Ssephe * available to read. In this case we repeat the process. 875302713Ssephe * 876302713Ssephe * NOTE: Interrupt has been disabled in the ISR. 877302710Ssephe */ 878302713Ssephe for (;;) { 879302713Ssephe uint32_t left; 880294886Ssephe 881302713Ssephe callback(arg); 882294886Ssephe 883302713Ssephe left = hv_ring_buffer_read_end(&chan->inbound); 884302713Ssephe if (left == 0) { 885302713Ssephe /* No more data in RX bufring; done */ 886302713Ssephe break; 887302713Ssephe } 888302713Ssephe hv_ring_buffer_read_begin(&chan->inbound); 889302713Ssephe } 890294886Ssephe} 891302692Ssephe 892302713Ssephestatic void 893302713Ssephevmbus_chan_task_nobatch(void *xchan, int pending __unused) 894302713Ssephe{ 895302713Ssephe struct hv_vmbus_channel *chan = xchan; 896302713Ssephe 897302713Ssephe chan->on_channel_callback(chan->channel_callback_context); 898302713Ssephe} 899302713Ssephe 900302692Ssephestatic __inline void 901302692Ssephevmbus_event_flags_proc(struct vmbus_softc *sc, volatile u_long *event_flags, 902302692Ssephe int flag_cnt) 903302692Ssephe{ 904302692Ssephe int f; 905302692Ssephe 906302692Ssephe for (f = 0; f < flag_cnt; ++f) { 907302692Ssephe uint32_t rel_id_base; 908302692Ssephe u_long flags; 909302692Ssephe int bit; 910302692Ssephe 911302692Ssephe if (event_flags[f] == 0) 912302692Ssephe continue; 913302692Ssephe 914302692Ssephe flags = atomic_swap_long(&event_flags[f], 0); 915302692Ssephe rel_id_base = f << VMBUS_EVTFLAG_SHIFT; 916302692Ssephe 917302692Ssephe while ((bit = ffsl(flags)) != 0) { 918302692Ssephe struct hv_vmbus_channel *channel; 919302692Ssephe uint32_t rel_id; 920302692Ssephe 921302692Ssephe --bit; /* NOTE: ffsl is 1-based */ 922302692Ssephe flags &= ~(1UL << bit); 923302692Ssephe 924302692Ssephe rel_id = rel_id_base + bit; 925302692Ssephe channel = sc->vmbus_chmap[rel_id]; 926302692Ssephe 927302692Ssephe /* if channel is closed or closing */ 928302692Ssephe if (channel == NULL || channel->rxq == NULL) 929302692Ssephe continue; 930302692Ssephe 931302709Ssephe if (channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD) 932302692Ssephe hv_ring_buffer_read_begin(&channel->inbound); 933302692Ssephe taskqueue_enqueue(channel->rxq, &channel->channel_task); 934302692Ssephe } 935302692Ssephe } 936302692Ssephe} 937302692Ssephe 938302692Ssephevoid 939302692Ssephevmbus_event_proc(struct vmbus_softc *sc, int cpu) 940302692Ssephe{ 941302692Ssephe struct vmbus_evtflags *eventf; 942302692Ssephe 943302692Ssephe /* 944302692Ssephe * On Host with Win8 or above, the event page can be checked directly 945302692Ssephe * to get the id of the channel that has the pending interrupt. 946302692Ssephe */ 947302692Ssephe eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 948302692Ssephe vmbus_event_flags_proc(sc, eventf->evt_flags, 949302692Ssephe VMBUS_PCPU_GET(sc, event_flags_cnt, cpu)); 950302692Ssephe} 951302692Ssephe 952302692Ssephevoid 953302692Ssephevmbus_event_proc_compat(struct vmbus_softc *sc, int cpu) 954302692Ssephe{ 955302692Ssephe struct vmbus_evtflags *eventf; 956302692Ssephe 957302692Ssephe eventf = VMBUS_PCPU_GET(sc, event_flags, cpu) + VMBUS_SINT_MESSAGE; 958302692Ssephe if (atomic_testandclear_long(&eventf->evt_flags[0], 0)) { 959302692Ssephe vmbus_event_flags_proc(sc, sc->vmbus_rx_evtflags, 960302692Ssephe VMBUS_CHAN_MAX_COMPAT >> VMBUS_EVTFLAG_SHIFT); 961302692Ssephe } 962302692Ssephe} 963302692Ssephe 964302692Ssephestatic void 965302692Ssephevmbus_chan_update_evtflagcnt(struct vmbus_softc *sc, 966302692Ssephe const struct hv_vmbus_channel *chan) 967302692Ssephe{ 968302692Ssephe volatile int *flag_cnt_ptr; 969302692Ssephe int flag_cnt; 970302692Ssephe 971302693Ssephe flag_cnt = (chan->ch_id / VMBUS_EVTFLAG_LEN) + 1; 972302692Ssephe flag_cnt_ptr = VMBUS_PCPU_PTR(sc, event_flags_cnt, chan->target_cpu); 973302692Ssephe 974302692Ssephe for (;;) { 975302692Ssephe int old_flag_cnt; 976302692Ssephe 977302692Ssephe old_flag_cnt = *flag_cnt_ptr; 978302692Ssephe if (old_flag_cnt >= flag_cnt) 979302692Ssephe break; 980302692Ssephe if (atomic_cmpset_int(flag_cnt_ptr, old_flag_cnt, flag_cnt)) { 981302692Ssephe if (bootverbose) { 982302692Ssephe device_printf(sc->vmbus_dev, 983302692Ssephe "channel%u update cpu%d flag_cnt to %d\n", 984302693Ssephe chan->ch_id, 985302692Ssephe chan->target_cpu, flag_cnt); 986302692Ssephe } 987302692Ssephe break; 988302692Ssephe } 989302692Ssephe } 990302692Ssephe} 991