vmbus_chan.c revision 298693
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 298693 2016-04-27 05:45:14Z 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> 40250199Sgrehan#include <machine/bus.h> 41250199Sgrehan#include <vm/vm.h> 42250199Sgrehan#include <vm/vm_param.h> 43250199Sgrehan#include <vm/pmap.h> 44250199Sgrehan 45250199Sgrehan#include "hv_vmbus_priv.h" 46250199Sgrehan 47250199Sgrehanstatic int vmbus_channel_create_gpadl_header( 48250199Sgrehan /* must be phys and virt contiguous*/ 49250199Sgrehan void* contig_buffer, 50250199Sgrehan /* page-size multiple */ 51250199Sgrehan uint32_t size, 52250199Sgrehan hv_vmbus_channel_msg_info** msg_info, 53250199Sgrehan uint32_t* message_count); 54250199Sgrehan 55250199Sgrehanstatic void vmbus_channel_set_event(hv_vmbus_channel* channel); 56294886Ssephestatic void VmbusProcessChannelEvent(void* channel, int pending); 57250199Sgrehan 58250199Sgrehan/** 59250199Sgrehan * @brief Trigger an event notification on the specified channel 60250199Sgrehan */ 61250199Sgrehanstatic void 62250199Sgrehanvmbus_channel_set_event(hv_vmbus_channel *channel) 63250199Sgrehan{ 64250199Sgrehan hv_vmbus_monitor_page *monitor_page; 65250199Sgrehan 66250199Sgrehan if (channel->offer_msg.monitor_allocated) { 67250199Sgrehan /* Each uint32_t represents 32 channels */ 68250199Sgrehan synch_set_bit((channel->offer_msg.child_rel_id & 31), 69250199Sgrehan ((uint32_t *)hv_vmbus_g_connection.send_interrupt_page 70250199Sgrehan + ((channel->offer_msg.child_rel_id >> 5)))); 71250199Sgrehan 72250199Sgrehan monitor_page = (hv_vmbus_monitor_page *) 73295309Ssephe hv_vmbus_g_connection.monitor_page_2; 74250199Sgrehan 75250199Sgrehan synch_set_bit(channel->monitor_bit, 76250199Sgrehan (uint32_t *)&monitor_page-> 77256276Sdim trigger_group[channel->monitor_group].u.pending); 78250199Sgrehan } else { 79282212Swhu hv_vmbus_set_event(channel); 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 90296289Ssephe if (chan->offer_msg.monitor_allocated) 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) { 110296181Ssephe dev = channel->device->device; 111296181Ssephe ch_id = channel->offer_msg.child_rel_id; 112296181Ssephe } else { 113296181Ssephe dev = primary_ch->device->device; 114296181Ssephe ch_id = primary_ch->offer_msg.child_rel_id; 115296181Ssephe sub_ch_id = channel->offer_msg.offer.sub_channel_index; 116296181Ssephe } 117296181Ssephe ctx = device_get_sysctl_ctx(dev); 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, 139296188Ssephe &channel->offer_msg.child_rel_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{ 181250199Sgrehan 182250199Sgrehan int ret = 0; 183250199Sgrehan void *in, *out; 184250199Sgrehan hv_vmbus_channel_open_channel* open_msg; 185250199Sgrehan hv_vmbus_channel_msg_info* open_info; 186250199Sgrehan 187282212Swhu mtx_lock(&new_channel->sc_lock); 188282212Swhu if (new_channel->state == HV_CHANNEL_OPEN_STATE) { 189282212Swhu new_channel->state = HV_CHANNEL_OPENING_STATE; 190282212Swhu } else { 191282212Swhu mtx_unlock(&new_channel->sc_lock); 192282212Swhu if(bootverbose) 193282212Swhu printf("VMBUS: Trying to open channel <%p> which in " 194282212Swhu "%d state.\n", new_channel, new_channel->state); 195282212Swhu return (EINVAL); 196282212Swhu } 197282212Swhu mtx_unlock(&new_channel->sc_lock); 198282212Swhu 199250199Sgrehan new_channel->on_channel_callback = pfn_on_channel_callback; 200250199Sgrehan new_channel->channel_callback_context = context; 201250199Sgrehan 202294886Ssephe new_channel->rxq = hv_vmbus_g_context.hv_event_queue[new_channel->target_cpu]; 203294886Ssephe TASK_INIT(&new_channel->channel_task, 0, VmbusProcessChannelEvent, new_channel); 204294886Ssephe 205250199Sgrehan /* Allocate the ring buffer */ 206250199Sgrehan out = contigmalloc((send_ring_buffer_size + recv_ring_buffer_size), 207256350Sgrehan M_DEVBUF, M_ZERO, 0UL, BUS_SPACE_MAXADDR, PAGE_SIZE, 0); 208250199Sgrehan KASSERT(out != NULL, 209250199Sgrehan ("Error VMBUS: contigmalloc failed to allocate Ring Buffer!")); 210250199Sgrehan if (out == NULL) 211256350Sgrehan return (ENOMEM); 212250199Sgrehan 213250199Sgrehan in = ((uint8_t *) out + send_ring_buffer_size); 214250199Sgrehan 215250199Sgrehan new_channel->ring_buffer_pages = out; 216256350Sgrehan new_channel->ring_buffer_page_count = (send_ring_buffer_size + 217256350Sgrehan recv_ring_buffer_size) >> PAGE_SHIFT; 218256350Sgrehan new_channel->ring_buffer_size = send_ring_buffer_size + 219256350Sgrehan recv_ring_buffer_size; 220250199Sgrehan 221250199Sgrehan hv_vmbus_ring_buffer_init( 222250199Sgrehan &new_channel->outbound, 223250199Sgrehan out, 224250199Sgrehan send_ring_buffer_size); 225250199Sgrehan 226250199Sgrehan hv_vmbus_ring_buffer_init( 227250199Sgrehan &new_channel->inbound, 228250199Sgrehan in, 229250199Sgrehan recv_ring_buffer_size); 230250199Sgrehan 231296290Ssephe /* Create sysctl tree for this channel */ 232296290Ssephe vmbus_channel_sysctl_create(new_channel); 233296181Ssephe 234250199Sgrehan /** 235250199Sgrehan * Establish the gpadl for the ring buffer 236250199Sgrehan */ 237250199Sgrehan new_channel->ring_buffer_gpadl_handle = 0; 238250199Sgrehan 239250199Sgrehan ret = hv_vmbus_channel_establish_gpadl(new_channel, 240250199Sgrehan new_channel->outbound.ring_buffer, 241250199Sgrehan send_ring_buffer_size + recv_ring_buffer_size, 242250199Sgrehan &new_channel->ring_buffer_gpadl_handle); 243250199Sgrehan 244250199Sgrehan /** 245250199Sgrehan * Create and init the channel open message 246250199Sgrehan */ 247250199Sgrehan open_info = (hv_vmbus_channel_msg_info*) malloc( 248250199Sgrehan sizeof(hv_vmbus_channel_msg_info) + 249250199Sgrehan sizeof(hv_vmbus_channel_open_channel), 250250199Sgrehan M_DEVBUF, 251250199Sgrehan M_NOWAIT); 252250199Sgrehan KASSERT(open_info != NULL, 253250199Sgrehan ("Error VMBUS: malloc failed to allocate Open Channel message!")); 254250199Sgrehan 255250199Sgrehan if (open_info == NULL) 256250199Sgrehan return (ENOMEM); 257250199Sgrehan 258250199Sgrehan sema_init(&open_info->wait_sema, 0, "Open Info Sema"); 259250199Sgrehan 260250199Sgrehan open_msg = (hv_vmbus_channel_open_channel*) open_info->msg; 261250199Sgrehan open_msg->header.message_type = HV_CHANNEL_MESSAGE_OPEN_CHANNEL; 262250199Sgrehan open_msg->open_id = new_channel->offer_msg.child_rel_id; 263250199Sgrehan open_msg->child_rel_id = new_channel->offer_msg.child_rel_id; 264250199Sgrehan open_msg->ring_buffer_gpadl_handle = 265250199Sgrehan new_channel->ring_buffer_gpadl_handle; 266250199Sgrehan open_msg->downstream_ring_buffer_page_offset = send_ring_buffer_size 267250199Sgrehan >> PAGE_SHIFT; 268282212Swhu open_msg->target_vcpu = new_channel->target_vcpu; 269250199Sgrehan 270250199Sgrehan if (user_data_len) 271250199Sgrehan memcpy(open_msg->user_data, user_data, user_data_len); 272250199Sgrehan 273297635Ssephe mtx_lock(&hv_vmbus_g_connection.channel_msg_lock); 274250199Sgrehan TAILQ_INSERT_TAIL( 275250199Sgrehan &hv_vmbus_g_connection.channel_msg_anchor, 276250199Sgrehan open_info, 277250199Sgrehan msg_list_entry); 278297635Ssephe mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock); 279250199Sgrehan 280250199Sgrehan ret = hv_vmbus_post_message( 281250199Sgrehan open_msg, sizeof(hv_vmbus_channel_open_channel)); 282250199Sgrehan 283250199Sgrehan if (ret != 0) 284250199Sgrehan goto cleanup; 285250199Sgrehan 286296028Ssephe ret = sema_timedwait(&open_info->wait_sema, 5 * hz); /* KYS 5 seconds */ 287250199Sgrehan 288282212Swhu if (ret) { 289282212Swhu if(bootverbose) 290282212Swhu printf("VMBUS: channel <%p> open timeout.\n", new_channel); 291250199Sgrehan goto cleanup; 292282212Swhu } 293250199Sgrehan 294250199Sgrehan if (open_info->response.open_result.status == 0) { 295282212Swhu new_channel->state = HV_CHANNEL_OPENED_STATE; 296250199Sgrehan if(bootverbose) 297250199Sgrehan printf("VMBUS: channel <%p> open success.\n", new_channel); 298250199Sgrehan } else { 299250199Sgrehan if(bootverbose) 300250199Sgrehan printf("Error VMBUS: channel <%p> open failed - %d!\n", 301250199Sgrehan new_channel, open_info->response.open_result.status); 302250199Sgrehan } 303250199Sgrehan 304250199Sgrehan cleanup: 305297635Ssephe mtx_lock(&hv_vmbus_g_connection.channel_msg_lock); 306250199Sgrehan TAILQ_REMOVE( 307250199Sgrehan &hv_vmbus_g_connection.channel_msg_anchor, 308250199Sgrehan open_info, 309250199Sgrehan msg_list_entry); 310297635Ssephe mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock); 311250199Sgrehan sema_destroy(&open_info->wait_sema); 312250199Sgrehan free(open_info, M_DEVBUF); 313250199Sgrehan 314250199Sgrehan return (ret); 315250199Sgrehan} 316250199Sgrehan 317250199Sgrehan/** 318250199Sgrehan * @brief Create a gpadl for the specified buffer 319250199Sgrehan */ 320250199Sgrehanstatic int 321250199Sgrehanvmbus_channel_create_gpadl_header( 322250199Sgrehan void* contig_buffer, 323250199Sgrehan uint32_t size, /* page-size multiple */ 324250199Sgrehan hv_vmbus_channel_msg_info** msg_info, 325250199Sgrehan uint32_t* message_count) 326250199Sgrehan{ 327250199Sgrehan int i; 328250199Sgrehan int page_count; 329250199Sgrehan unsigned long long pfn; 330250199Sgrehan uint32_t msg_size; 331250199Sgrehan hv_vmbus_channel_gpadl_header* gpa_header; 332250199Sgrehan hv_vmbus_channel_gpadl_body* gpadl_body; 333250199Sgrehan hv_vmbus_channel_msg_info* msg_header; 334250199Sgrehan hv_vmbus_channel_msg_info* msg_body; 335250199Sgrehan 336250199Sgrehan int pfnSum, pfnCount, pfnLeft, pfnCurr, pfnSize; 337250199Sgrehan 338250199Sgrehan page_count = size >> PAGE_SHIFT; 339250199Sgrehan pfn = hv_get_phys_addr(contig_buffer) >> PAGE_SHIFT; 340250199Sgrehan 341250199Sgrehan /*do we need a gpadl body msg */ 342250199Sgrehan pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE 343250199Sgrehan - sizeof(hv_vmbus_channel_gpadl_header) 344250199Sgrehan - sizeof(hv_gpa_range); 345250199Sgrehan pfnCount = pfnSize / sizeof(uint64_t); 346250199Sgrehan 347250199Sgrehan if (page_count > pfnCount) { /* if(we need a gpadl body) */ 348250199Sgrehan /* fill in the header */ 349250199Sgrehan msg_size = sizeof(hv_vmbus_channel_msg_info) 350250199Sgrehan + sizeof(hv_vmbus_channel_gpadl_header) 351250199Sgrehan + sizeof(hv_gpa_range) 352250199Sgrehan + pfnCount * sizeof(uint64_t); 353250199Sgrehan msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); 354250199Sgrehan KASSERT( 355250199Sgrehan msg_header != NULL, 356250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl Message!")); 357250199Sgrehan if (msg_header == NULL) 358250199Sgrehan return (ENOMEM); 359250199Sgrehan 360250199Sgrehan TAILQ_INIT(&msg_header->sub_msg_list_anchor); 361250199Sgrehan msg_header->message_size = msg_size; 362250199Sgrehan 363250199Sgrehan gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg; 364250199Sgrehan gpa_header->range_count = 1; 365250199Sgrehan gpa_header->range_buf_len = sizeof(hv_gpa_range) 366250199Sgrehan + page_count * sizeof(uint64_t); 367250199Sgrehan gpa_header->range[0].byte_offset = 0; 368250199Sgrehan gpa_header->range[0].byte_count = size; 369250199Sgrehan for (i = 0; i < pfnCount; i++) { 370250199Sgrehan gpa_header->range[0].pfn_array[i] = pfn + i; 371250199Sgrehan } 372250199Sgrehan *msg_info = msg_header; 373250199Sgrehan *message_count = 1; 374250199Sgrehan 375250199Sgrehan pfnSum = pfnCount; 376250199Sgrehan pfnLeft = page_count - pfnCount; 377250199Sgrehan 378250199Sgrehan /* 379250199Sgrehan * figure out how many pfns we can fit 380250199Sgrehan */ 381250199Sgrehan pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE 382250199Sgrehan - sizeof(hv_vmbus_channel_gpadl_body); 383250199Sgrehan pfnCount = pfnSize / sizeof(uint64_t); 384250199Sgrehan 385250199Sgrehan /* 386250199Sgrehan * fill in the body 387250199Sgrehan */ 388250199Sgrehan while (pfnLeft) { 389250199Sgrehan if (pfnLeft > pfnCount) { 390250199Sgrehan pfnCurr = pfnCount; 391250199Sgrehan } else { 392250199Sgrehan pfnCurr = pfnLeft; 393250199Sgrehan } 394250199Sgrehan 395250199Sgrehan msg_size = sizeof(hv_vmbus_channel_msg_info) + 396250199Sgrehan sizeof(hv_vmbus_channel_gpadl_body) + 397250199Sgrehan pfnCurr * sizeof(uint64_t); 398250199Sgrehan msg_body = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); 399250199Sgrehan KASSERT( 400250199Sgrehan msg_body != NULL, 401250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl msg_body!")); 402250199Sgrehan if (msg_body == NULL) 403250199Sgrehan return (ENOMEM); 404250199Sgrehan 405250199Sgrehan msg_body->message_size = msg_size; 406250199Sgrehan (*message_count)++; 407250199Sgrehan gpadl_body = 408250199Sgrehan (hv_vmbus_channel_gpadl_body*) msg_body->msg; 409250199Sgrehan /* 410250199Sgrehan * gpadl_body->gpadl = kbuffer; 411250199Sgrehan */ 412250199Sgrehan for (i = 0; i < pfnCurr; i++) { 413250199Sgrehan gpadl_body->pfn[i] = pfn + pfnSum + i; 414250199Sgrehan } 415250199Sgrehan 416250199Sgrehan TAILQ_INSERT_TAIL( 417250199Sgrehan &msg_header->sub_msg_list_anchor, 418250199Sgrehan msg_body, 419250199Sgrehan msg_list_entry); 420250199Sgrehan pfnSum += pfnCurr; 421250199Sgrehan pfnLeft -= pfnCurr; 422250199Sgrehan } 423250199Sgrehan } else { /* else everything fits in a header */ 424250199Sgrehan 425250199Sgrehan msg_size = sizeof(hv_vmbus_channel_msg_info) + 426250199Sgrehan sizeof(hv_vmbus_channel_gpadl_header) + 427250199Sgrehan sizeof(hv_gpa_range) + 428250199Sgrehan page_count * sizeof(uint64_t); 429250199Sgrehan msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); 430250199Sgrehan KASSERT( 431250199Sgrehan msg_header != NULL, 432250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl Message!")); 433250199Sgrehan if (msg_header == NULL) 434250199Sgrehan return (ENOMEM); 435250199Sgrehan 436250199Sgrehan msg_header->message_size = msg_size; 437250199Sgrehan 438250199Sgrehan gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg; 439250199Sgrehan gpa_header->range_count = 1; 440250199Sgrehan gpa_header->range_buf_len = sizeof(hv_gpa_range) + 441250199Sgrehan page_count * sizeof(uint64_t); 442250199Sgrehan gpa_header->range[0].byte_offset = 0; 443250199Sgrehan gpa_header->range[0].byte_count = size; 444250199Sgrehan for (i = 0; i < page_count; i++) { 445250199Sgrehan gpa_header->range[0].pfn_array[i] = pfn + i; 446250199Sgrehan } 447250199Sgrehan 448250199Sgrehan *msg_info = msg_header; 449250199Sgrehan *message_count = 1; 450250199Sgrehan } 451250199Sgrehan 452250199Sgrehan return (0); 453250199Sgrehan} 454250199Sgrehan 455250199Sgrehan/** 456250199Sgrehan * @brief Establish a GPADL for the specified buffer 457250199Sgrehan */ 458250199Sgrehanint 459250199Sgrehanhv_vmbus_channel_establish_gpadl( 460250199Sgrehan hv_vmbus_channel* channel, 461250199Sgrehan void* contig_buffer, 462250199Sgrehan uint32_t size, /* page-size multiple */ 463250199Sgrehan uint32_t* gpadl_handle) 464250199Sgrehan 465250199Sgrehan{ 466250199Sgrehan int ret = 0; 467250199Sgrehan hv_vmbus_channel_gpadl_header* gpadl_msg; 468250199Sgrehan hv_vmbus_channel_gpadl_body* gpadl_body; 469250199Sgrehan hv_vmbus_channel_msg_info* msg_info; 470250199Sgrehan hv_vmbus_channel_msg_info* sub_msg_info; 471250199Sgrehan uint32_t msg_count; 472250199Sgrehan hv_vmbus_channel_msg_info* curr; 473250199Sgrehan uint32_t next_gpadl_handle; 474250199Sgrehan 475296076Ssephe next_gpadl_handle = atomic_fetchadd_int( 476296076Ssephe &hv_vmbus_g_connection.next_gpadl_handle, 1); 477250199Sgrehan 478250199Sgrehan ret = vmbus_channel_create_gpadl_header( 479250199Sgrehan contig_buffer, size, &msg_info, &msg_count); 480250199Sgrehan 481296076Ssephe if(ret != 0) { 482296076Ssephe /* 483296076Ssephe * XXX 484296076Ssephe * We can _not_ even revert the above incremental, 485296076Ssephe * if multiple GPADL establishments are running 486296076Ssephe * parallelly, decrement the global next_gpadl_handle 487296076Ssephe * is calling for _big_ trouble. A better solution 488296076Ssephe * is to have a 0-based GPADL id bitmap ... 489296076Ssephe */ 490296076Ssephe return ret; 491250199Sgrehan } 492250199Sgrehan 493250199Sgrehan sema_init(&msg_info->wait_sema, 0, "Open Info Sema"); 494250199Sgrehan gpadl_msg = (hv_vmbus_channel_gpadl_header*) msg_info->msg; 495250199Sgrehan gpadl_msg->header.message_type = HV_CHANNEL_MESSAGEL_GPADL_HEADER; 496250199Sgrehan gpadl_msg->child_rel_id = channel->offer_msg.child_rel_id; 497250199Sgrehan gpadl_msg->gpadl = next_gpadl_handle; 498250199Sgrehan 499297635Ssephe mtx_lock(&hv_vmbus_g_connection.channel_msg_lock); 500250199Sgrehan TAILQ_INSERT_TAIL( 501250199Sgrehan &hv_vmbus_g_connection.channel_msg_anchor, 502250199Sgrehan msg_info, 503250199Sgrehan msg_list_entry); 504250199Sgrehan 505297635Ssephe mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock); 506250199Sgrehan 507250199Sgrehan ret = hv_vmbus_post_message( 508250199Sgrehan gpadl_msg, 509250199Sgrehan msg_info->message_size - 510250199Sgrehan (uint32_t) sizeof(hv_vmbus_channel_msg_info)); 511250199Sgrehan 512250199Sgrehan if (ret != 0) 513250199Sgrehan goto cleanup; 514250199Sgrehan 515250199Sgrehan if (msg_count > 1) { 516250199Sgrehan TAILQ_FOREACH(curr, 517250199Sgrehan &msg_info->sub_msg_list_anchor, msg_list_entry) { 518250199Sgrehan sub_msg_info = curr; 519250199Sgrehan gpadl_body = 520250199Sgrehan (hv_vmbus_channel_gpadl_body*) sub_msg_info->msg; 521250199Sgrehan 522250199Sgrehan gpadl_body->header.message_type = 523250199Sgrehan HV_CHANNEL_MESSAGE_GPADL_BODY; 524250199Sgrehan gpadl_body->gpadl = next_gpadl_handle; 525250199Sgrehan 526250199Sgrehan ret = hv_vmbus_post_message( 527250199Sgrehan gpadl_body, 528250199Sgrehan sub_msg_info->message_size 529250199Sgrehan - (uint32_t) sizeof(hv_vmbus_channel_msg_info)); 530250199Sgrehan /* if (the post message failed) give up and clean up */ 531250199Sgrehan if(ret != 0) 532250199Sgrehan goto cleanup; 533250199Sgrehan } 534250199Sgrehan } 535250199Sgrehan 536296028Ssephe ret = sema_timedwait(&msg_info->wait_sema, 5 * hz); /* KYS 5 seconds*/ 537250199Sgrehan if (ret != 0) 538250199Sgrehan goto cleanup; 539250199Sgrehan 540250199Sgrehan *gpadl_handle = gpadl_msg->gpadl; 541250199Sgrehan 542250199Sgrehancleanup: 543250199Sgrehan 544297635Ssephe mtx_lock(&hv_vmbus_g_connection.channel_msg_lock); 545250199Sgrehan TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor, 546250199Sgrehan msg_info, msg_list_entry); 547297635Ssephe mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock); 548250199Sgrehan 549250199Sgrehan sema_destroy(&msg_info->wait_sema); 550250199Sgrehan free(msg_info, M_DEVBUF); 551250199Sgrehan 552250199Sgrehan return (ret); 553250199Sgrehan} 554250199Sgrehan 555250199Sgrehan/** 556250199Sgrehan * @brief Teardown the specified GPADL handle 557250199Sgrehan */ 558250199Sgrehanint 559250199Sgrehanhv_vmbus_channel_teardown_gpdal( 560250199Sgrehan hv_vmbus_channel* channel, 561250199Sgrehan uint32_t gpadl_handle) 562250199Sgrehan{ 563250199Sgrehan int ret = 0; 564250199Sgrehan hv_vmbus_channel_gpadl_teardown* msg; 565250199Sgrehan hv_vmbus_channel_msg_info* info; 566250199Sgrehan 567250199Sgrehan info = (hv_vmbus_channel_msg_info *) 568250199Sgrehan malloc( sizeof(hv_vmbus_channel_msg_info) + 569250199Sgrehan sizeof(hv_vmbus_channel_gpadl_teardown), 570250199Sgrehan M_DEVBUF, M_NOWAIT); 571250199Sgrehan KASSERT(info != NULL, 572250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl Teardown Msg!")); 573250199Sgrehan if (info == NULL) { 574250199Sgrehan ret = ENOMEM; 575250199Sgrehan goto cleanup; 576250199Sgrehan } 577250199Sgrehan 578250199Sgrehan sema_init(&info->wait_sema, 0, "Open Info Sema"); 579250199Sgrehan 580250199Sgrehan msg = (hv_vmbus_channel_gpadl_teardown*) info->msg; 581250199Sgrehan 582250199Sgrehan msg->header.message_type = HV_CHANNEL_MESSAGE_GPADL_TEARDOWN; 583250199Sgrehan msg->child_rel_id = channel->offer_msg.child_rel_id; 584250199Sgrehan msg->gpadl = gpadl_handle; 585250199Sgrehan 586297635Ssephe mtx_lock(&hv_vmbus_g_connection.channel_msg_lock); 587250199Sgrehan TAILQ_INSERT_TAIL(&hv_vmbus_g_connection.channel_msg_anchor, 588250199Sgrehan info, msg_list_entry); 589297635Ssephe mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock); 590250199Sgrehan 591250199Sgrehan ret = hv_vmbus_post_message(msg, 592250199Sgrehan sizeof(hv_vmbus_channel_gpadl_teardown)); 593250199Sgrehan if (ret != 0) 594250199Sgrehan goto cleanup; 595250199Sgrehan 596296028Ssephe ret = sema_timedwait(&info->wait_sema, 5 * hz); /* KYS 5 seconds */ 597250199Sgrehan 598250199Sgrehancleanup: 599250199Sgrehan /* 600250199Sgrehan * Received a torndown response 601250199Sgrehan */ 602297635Ssephe mtx_lock(&hv_vmbus_g_connection.channel_msg_lock); 603250199Sgrehan TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor, 604250199Sgrehan info, msg_list_entry); 605297635Ssephe mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock); 606250199Sgrehan sema_destroy(&info->wait_sema); 607250199Sgrehan free(info, M_DEVBUF); 608250199Sgrehan 609250199Sgrehan return (ret); 610250199Sgrehan} 611250199Sgrehan 612282212Swhustatic void 613282212Swhuhv_vmbus_channel_close_internal(hv_vmbus_channel *channel) 614250199Sgrehan{ 615250199Sgrehan int ret = 0; 616294886Ssephe struct taskqueue *rxq = channel->rxq; 617250199Sgrehan hv_vmbus_channel_close_channel* msg; 618250199Sgrehan hv_vmbus_channel_msg_info* info; 619250199Sgrehan 620282212Swhu channel->state = HV_CHANNEL_OPEN_STATE; 621282212Swhu 622282212Swhu /* 623294886Ssephe * set rxq to NULL to avoid more requests be scheduled 624294886Ssephe */ 625294886Ssephe channel->rxq = NULL; 626294886Ssephe taskqueue_drain(rxq, &channel->channel_task); 627250199Sgrehan channel->on_channel_callback = NULL; 628250199Sgrehan 629250199Sgrehan /** 630250199Sgrehan * Send a closing message 631250199Sgrehan */ 632250199Sgrehan info = (hv_vmbus_channel_msg_info *) 633250199Sgrehan malloc( sizeof(hv_vmbus_channel_msg_info) + 634250199Sgrehan sizeof(hv_vmbus_channel_close_channel), 635250199Sgrehan M_DEVBUF, M_NOWAIT); 636250199Sgrehan KASSERT(info != NULL, ("VMBUS: malloc failed hv_vmbus_channel_close!")); 637250199Sgrehan if(info == NULL) 638250199Sgrehan return; 639250199Sgrehan 640250199Sgrehan msg = (hv_vmbus_channel_close_channel*) info->msg; 641250199Sgrehan msg->header.message_type = HV_CHANNEL_MESSAGE_CLOSE_CHANNEL; 642250199Sgrehan msg->child_rel_id = channel->offer_msg.child_rel_id; 643250199Sgrehan 644250199Sgrehan ret = hv_vmbus_post_message( 645250199Sgrehan msg, sizeof(hv_vmbus_channel_close_channel)); 646250199Sgrehan 647250199Sgrehan /* Tear down the gpadl for the channel's ring buffer */ 648250199Sgrehan if (channel->ring_buffer_gpadl_handle) { 649250199Sgrehan hv_vmbus_channel_teardown_gpdal(channel, 650250199Sgrehan channel->ring_buffer_gpadl_handle); 651250199Sgrehan } 652250199Sgrehan 653250199Sgrehan /* TODO: Send a msg to release the childRelId */ 654250199Sgrehan 655250199Sgrehan /* cleanup the ring buffers for this channel */ 656250199Sgrehan hv_ring_buffer_cleanup(&channel->outbound); 657250199Sgrehan hv_ring_buffer_cleanup(&channel->inbound); 658250199Sgrehan 659256350Sgrehan contigfree(channel->ring_buffer_pages, channel->ring_buffer_size, 660256350Sgrehan M_DEVBUF); 661250199Sgrehan 662250199Sgrehan free(info, M_DEVBUF); 663282212Swhu} 664250199Sgrehan 665282212Swhu/** 666282212Swhu * @brief Close the specified channel 667282212Swhu */ 668282212Swhuvoid 669282212Swhuhv_vmbus_channel_close(hv_vmbus_channel *channel) 670282212Swhu{ 671282212Swhu hv_vmbus_channel* sub_channel; 672282212Swhu 673282212Swhu if (channel->primary_channel != NULL) { 674282212Swhu /* 675282212Swhu * We only close multi-channels when the primary is 676282212Swhu * closed. 677282212Swhu */ 678282212Swhu return; 679282212Swhu } 680282212Swhu 681250199Sgrehan /* 682282212Swhu * Close all multi-channels first. 683250199Sgrehan */ 684282212Swhu TAILQ_FOREACH(sub_channel, &channel->sc_list_anchor, 685282212Swhu sc_list_entry) { 686282212Swhu if (sub_channel->state != HV_CHANNEL_OPENED_STATE) 687282212Swhu continue; 688282212Swhu hv_vmbus_channel_close_internal(sub_channel); 689250199Sgrehan } 690282212Swhu /* 691282212Swhu * Then close the primary channel. 692282212Swhu */ 693282212Swhu hv_vmbus_channel_close_internal(channel); 694250199Sgrehan} 695250199Sgrehan 696250199Sgrehan/** 697250199Sgrehan * @brief Send the specified buffer on the given channel 698250199Sgrehan */ 699250199Sgrehanint 700250199Sgrehanhv_vmbus_channel_send_packet( 701250199Sgrehan hv_vmbus_channel* channel, 702250199Sgrehan void* buffer, 703250199Sgrehan uint32_t buffer_len, 704250199Sgrehan uint64_t request_id, 705250199Sgrehan hv_vmbus_packet_type type, 706250199Sgrehan uint32_t flags) 707250199Sgrehan{ 708250199Sgrehan int ret = 0; 709250199Sgrehan hv_vm_packet_descriptor desc; 710250199Sgrehan uint32_t packet_len; 711250199Sgrehan uint64_t aligned_data; 712250199Sgrehan uint32_t packet_len_aligned; 713282212Swhu boolean_t need_sig; 714250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 715250199Sgrehan 716250199Sgrehan packet_len = sizeof(hv_vm_packet_descriptor) + buffer_len; 717250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 718250199Sgrehan aligned_data = 0; 719250199Sgrehan 720250199Sgrehan /* Setup the descriptor */ 721250199Sgrehan desc.type = type; /* HV_VMBUS_PACKET_TYPE_DATA_IN_BAND; */ 722250199Sgrehan desc.flags = flags; /* HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED */ 723250199Sgrehan /* in 8-bytes granularity */ 724250199Sgrehan desc.data_offset8 = sizeof(hv_vm_packet_descriptor) >> 3; 725250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 726250199Sgrehan desc.transaction_id = request_id; 727250199Sgrehan 728250199Sgrehan buffer_list[0].data = &desc; 729250199Sgrehan buffer_list[0].length = sizeof(hv_vm_packet_descriptor); 730250199Sgrehan 731250199Sgrehan buffer_list[1].data = buffer; 732250199Sgrehan buffer_list[1].length = buffer_len; 733250199Sgrehan 734250199Sgrehan buffer_list[2].data = &aligned_data; 735250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 736250199Sgrehan 737282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 738282212Swhu &need_sig); 739250199Sgrehan 740250199Sgrehan /* TODO: We should determine if this is optional */ 741282212Swhu if (ret == 0 && need_sig) { 742250199Sgrehan vmbus_channel_set_event(channel); 743250199Sgrehan } 744250199Sgrehan 745250199Sgrehan return (ret); 746250199Sgrehan} 747250199Sgrehan 748250199Sgrehan/** 749250199Sgrehan * @brief Send a range of single-page buffer packets using 750250199Sgrehan * a GPADL Direct packet type 751250199Sgrehan */ 752250199Sgrehanint 753250199Sgrehanhv_vmbus_channel_send_packet_pagebuffer( 754250199Sgrehan hv_vmbus_channel* channel, 755250199Sgrehan hv_vmbus_page_buffer page_buffers[], 756250199Sgrehan uint32_t page_count, 757250199Sgrehan void* buffer, 758250199Sgrehan uint32_t buffer_len, 759250199Sgrehan uint64_t request_id) 760250199Sgrehan{ 761250199Sgrehan 762250199Sgrehan int ret = 0; 763282212Swhu boolean_t need_sig; 764250199Sgrehan uint32_t packet_len; 765294705Ssephe uint32_t page_buflen; 766250199Sgrehan uint32_t packetLen_aligned; 767294705Ssephe hv_vmbus_sg_buffer_list buffer_list[4]; 768250199Sgrehan hv_vmbus_channel_packet_page_buffer desc; 769250199Sgrehan uint32_t descSize; 770250199Sgrehan uint64_t alignedData = 0; 771250199Sgrehan 772250199Sgrehan if (page_count > HV_MAX_PAGE_BUFFER_COUNT) 773250199Sgrehan return (EINVAL); 774250199Sgrehan 775250199Sgrehan /* 776250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_page_buffer 777250199Sgrehan * is the largest size we support 778250199Sgrehan */ 779294705Ssephe descSize = __offsetof(hv_vmbus_channel_packet_page_buffer, range); 780294705Ssephe page_buflen = sizeof(hv_vmbus_page_buffer) * page_count; 781294705Ssephe packet_len = descSize + page_buflen + buffer_len; 782250199Sgrehan packetLen_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 783250199Sgrehan 784250199Sgrehan /* Setup the descriptor */ 785250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 786250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 787294705Ssephe /* in 8-bytes granularity */ 788294705Ssephe desc.data_offset8 = (descSize + page_buflen) >> 3; 789250199Sgrehan desc.length8 = (uint16_t) (packetLen_aligned >> 3); 790250199Sgrehan desc.transaction_id = request_id; 791250199Sgrehan desc.range_count = page_count; 792250199Sgrehan 793250199Sgrehan buffer_list[0].data = &desc; 794250199Sgrehan buffer_list[0].length = descSize; 795250199Sgrehan 796294705Ssephe buffer_list[1].data = page_buffers; 797294705Ssephe buffer_list[1].length = page_buflen; 798250199Sgrehan 799294705Ssephe buffer_list[2].data = buffer; 800294705Ssephe buffer_list[2].length = buffer_len; 801250199Sgrehan 802294705Ssephe buffer_list[3].data = &alignedData; 803294705Ssephe buffer_list[3].length = packetLen_aligned - packet_len; 804294705Ssephe 805294705Ssephe ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 4, 806282212Swhu &need_sig); 807250199Sgrehan 808250199Sgrehan /* TODO: We should determine if this is optional */ 809282212Swhu if (ret == 0 && need_sig) { 810250199Sgrehan vmbus_channel_set_event(channel); 811250199Sgrehan } 812250199Sgrehan 813250199Sgrehan return (ret); 814250199Sgrehan} 815250199Sgrehan 816250199Sgrehan/** 817250199Sgrehan * @brief Send a multi-page buffer packet using a GPADL Direct packet type 818250199Sgrehan */ 819250199Sgrehanint 820250199Sgrehanhv_vmbus_channel_send_packet_multipagebuffer( 821250199Sgrehan hv_vmbus_channel* channel, 822250199Sgrehan hv_vmbus_multipage_buffer* multi_page_buffer, 823250199Sgrehan void* buffer, 824250199Sgrehan uint32_t buffer_len, 825250199Sgrehan uint64_t request_id) 826250199Sgrehan{ 827250199Sgrehan 828250199Sgrehan int ret = 0; 829250199Sgrehan uint32_t desc_size; 830282212Swhu boolean_t need_sig; 831250199Sgrehan uint32_t packet_len; 832250199Sgrehan uint32_t packet_len_aligned; 833250199Sgrehan uint32_t pfn_count; 834250199Sgrehan uint64_t aligned_data = 0; 835250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 836250199Sgrehan hv_vmbus_channel_packet_multipage_buffer desc; 837250199Sgrehan 838250199Sgrehan pfn_count = 839250199Sgrehan HV_NUM_PAGES_SPANNED( 840250199Sgrehan multi_page_buffer->offset, 841250199Sgrehan multi_page_buffer->length); 842250199Sgrehan 843250199Sgrehan if ((pfn_count == 0) || (pfn_count > HV_MAX_MULTIPAGE_BUFFER_COUNT)) 844250199Sgrehan return (EINVAL); 845250199Sgrehan /* 846250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_multipage_buffer 847250199Sgrehan * is the largest size we support 848250199Sgrehan */ 849250199Sgrehan desc_size = 850250199Sgrehan sizeof(hv_vmbus_channel_packet_multipage_buffer) - 851250199Sgrehan ((HV_MAX_MULTIPAGE_BUFFER_COUNT - pfn_count) * 852250199Sgrehan sizeof(uint64_t)); 853250199Sgrehan packet_len = desc_size + buffer_len; 854250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 855250199Sgrehan 856250199Sgrehan /* 857250199Sgrehan * Setup the descriptor 858250199Sgrehan */ 859250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 860250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 861250199Sgrehan desc.data_offset8 = desc_size >> 3; /* in 8-bytes granularity */ 862250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 863250199Sgrehan desc.transaction_id = request_id; 864250199Sgrehan desc.range_count = 1; 865250199Sgrehan 866250199Sgrehan desc.range.length = multi_page_buffer->length; 867250199Sgrehan desc.range.offset = multi_page_buffer->offset; 868250199Sgrehan 869250199Sgrehan memcpy(desc.range.pfn_array, multi_page_buffer->pfn_array, 870250199Sgrehan pfn_count * sizeof(uint64_t)); 871250199Sgrehan 872250199Sgrehan buffer_list[0].data = &desc; 873250199Sgrehan buffer_list[0].length = desc_size; 874250199Sgrehan 875250199Sgrehan buffer_list[1].data = buffer; 876250199Sgrehan buffer_list[1].length = buffer_len; 877250199Sgrehan 878250199Sgrehan buffer_list[2].data = &aligned_data; 879250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 880250199Sgrehan 881282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 882282212Swhu &need_sig); 883250199Sgrehan 884250199Sgrehan /* TODO: We should determine if this is optional */ 885282212Swhu if (ret == 0 && need_sig) { 886250199Sgrehan vmbus_channel_set_event(channel); 887250199Sgrehan } 888250199Sgrehan 889250199Sgrehan return (ret); 890250199Sgrehan} 891250199Sgrehan 892250199Sgrehan/** 893250199Sgrehan * @brief Retrieve the user packet on the specified channel 894250199Sgrehan */ 895250199Sgrehanint 896250199Sgrehanhv_vmbus_channel_recv_packet( 897250199Sgrehan hv_vmbus_channel* channel, 898250199Sgrehan void* Buffer, 899250199Sgrehan uint32_t buffer_len, 900250199Sgrehan uint32_t* buffer_actual_len, 901250199Sgrehan uint64_t* request_id) 902250199Sgrehan{ 903250199Sgrehan int ret; 904250199Sgrehan uint32_t user_len; 905250199Sgrehan uint32_t packet_len; 906250199Sgrehan hv_vm_packet_descriptor desc; 907250199Sgrehan 908250199Sgrehan *buffer_actual_len = 0; 909250199Sgrehan *request_id = 0; 910250199Sgrehan 911250199Sgrehan ret = hv_ring_buffer_peek(&channel->inbound, &desc, 912250199Sgrehan sizeof(hv_vm_packet_descriptor)); 913250199Sgrehan if (ret != 0) 914250199Sgrehan return (0); 915250199Sgrehan 916250199Sgrehan packet_len = desc.length8 << 3; 917250199Sgrehan user_len = packet_len - (desc.data_offset8 << 3); 918250199Sgrehan 919250199Sgrehan *buffer_actual_len = user_len; 920250199Sgrehan 921250199Sgrehan if (user_len > buffer_len) 922250199Sgrehan return (EINVAL); 923250199Sgrehan 924250199Sgrehan *request_id = desc.transaction_id; 925250199Sgrehan 926250199Sgrehan /* Copy over the packet to the user buffer */ 927250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, Buffer, user_len, 928250199Sgrehan (desc.data_offset8 << 3)); 929250199Sgrehan 930250199Sgrehan return (0); 931250199Sgrehan} 932250199Sgrehan 933250199Sgrehan/** 934250199Sgrehan * @brief Retrieve the raw packet on the specified channel 935250199Sgrehan */ 936250199Sgrehanint 937250199Sgrehanhv_vmbus_channel_recv_packet_raw( 938250199Sgrehan hv_vmbus_channel* channel, 939250199Sgrehan void* buffer, 940250199Sgrehan uint32_t buffer_len, 941250199Sgrehan uint32_t* buffer_actual_len, 942250199Sgrehan uint64_t* request_id) 943250199Sgrehan{ 944250199Sgrehan int ret; 945250199Sgrehan uint32_t packetLen; 946250199Sgrehan hv_vm_packet_descriptor desc; 947250199Sgrehan 948250199Sgrehan *buffer_actual_len = 0; 949250199Sgrehan *request_id = 0; 950250199Sgrehan 951250199Sgrehan ret = hv_ring_buffer_peek( 952250199Sgrehan &channel->inbound, &desc, 953250199Sgrehan sizeof(hv_vm_packet_descriptor)); 954250199Sgrehan 955250199Sgrehan if (ret != 0) 956250199Sgrehan return (0); 957250199Sgrehan 958250199Sgrehan packetLen = desc.length8 << 3; 959250199Sgrehan *buffer_actual_len = packetLen; 960250199Sgrehan 961250199Sgrehan if (packetLen > buffer_len) 962250199Sgrehan return (ENOBUFS); 963250199Sgrehan 964250199Sgrehan *request_id = desc.transaction_id; 965250199Sgrehan 966250199Sgrehan /* Copy over the entire packet to the user buffer */ 967250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0); 968250199Sgrehan 969250199Sgrehan return (0); 970250199Sgrehan} 971294886Ssephe 972294886Ssephe 973294886Ssephe/** 974294886Ssephe * Process a channel event notification 975294886Ssephe */ 976294886Ssephestatic void 977294886SsepheVmbusProcessChannelEvent(void* context, int pending) 978294886Ssephe{ 979294886Ssephe void* arg; 980294886Ssephe uint32_t bytes_to_read; 981294886Ssephe hv_vmbus_channel* channel = (hv_vmbus_channel*)context; 982294886Ssephe boolean_t is_batched_reading; 983294886Ssephe 984294886Ssephe /** 985294886Ssephe * Find the channel based on this relid and invokes 986294886Ssephe * the channel callback to process the event 987294886Ssephe */ 988294886Ssephe 989294886Ssephe if (channel == NULL) { 990294886Ssephe return; 991294886Ssephe } 992294886Ssephe /** 993294886Ssephe * To deal with the race condition where we might 994294886Ssephe * receive a packet while the relevant driver is 995294886Ssephe * being unloaded, dispatch the callback while 996294886Ssephe * holding the channel lock. The unloading driver 997294886Ssephe * will acquire the same channel lock to set the 998294886Ssephe * callback to NULL. This closes the window. 999294886Ssephe */ 1000294886Ssephe 1001294886Ssephe if (channel->on_channel_callback != NULL) { 1002294886Ssephe arg = channel->channel_callback_context; 1003294886Ssephe is_batched_reading = channel->batched_reading; 1004294886Ssephe /* 1005294886Ssephe * Optimize host to guest signaling by ensuring: 1006294886Ssephe * 1. While reading the channel, we disable interrupts from 1007294886Ssephe * host. 1008294886Ssephe * 2. Ensure that we process all posted messages from the host 1009294886Ssephe * before returning from this callback. 1010294886Ssephe * 3. Once we return, enable signaling from the host. Once this 1011294886Ssephe * state is set we check to see if additional packets are 1012294886Ssephe * available to read. In this case we repeat the process. 1013294886Ssephe */ 1014294886Ssephe do { 1015294886Ssephe if (is_batched_reading) 1016294886Ssephe hv_ring_buffer_read_begin(&channel->inbound); 1017294886Ssephe 1018294886Ssephe channel->on_channel_callback(arg); 1019294886Ssephe 1020294886Ssephe if (is_batched_reading) 1021294886Ssephe bytes_to_read = 1022294886Ssephe hv_ring_buffer_read_end(&channel->inbound); 1023294886Ssephe else 1024294886Ssephe bytes_to_read = 0; 1025294886Ssephe } while (is_batched_reading && (bytes_to_read != 0)); 1026294886Ssephe } 1027294886Ssephe} 1028