vmbus_chan.c revision 295309
1250199Sgrehan/*- 2250199Sgrehan * Copyright (c) 2009-2012 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 295309 2016-02-05 07:29:11Z sephe $"); 31256276Sdim 32250199Sgrehan#include <sys/param.h> 33250199Sgrehan#include <sys/malloc.h> 34250199Sgrehan#include <sys/systm.h> 35250199Sgrehan#include <sys/mbuf.h> 36250199Sgrehan#include <sys/lock.h> 37250199Sgrehan#include <sys/mutex.h> 38250199Sgrehan#include <machine/bus.h> 39250199Sgrehan#include <vm/vm.h> 40250199Sgrehan#include <vm/vm_param.h> 41250199Sgrehan#include <vm/pmap.h> 42250199Sgrehan 43250199Sgrehan#include "hv_vmbus_priv.h" 44250199Sgrehan 45250199Sgrehanstatic int vmbus_channel_create_gpadl_header( 46250199Sgrehan /* must be phys and virt contiguous*/ 47250199Sgrehan void* contig_buffer, 48250199Sgrehan /* page-size multiple */ 49250199Sgrehan uint32_t size, 50250199Sgrehan hv_vmbus_channel_msg_info** msg_info, 51250199Sgrehan uint32_t* message_count); 52250199Sgrehan 53250199Sgrehanstatic void vmbus_channel_set_event(hv_vmbus_channel* channel); 54294886Ssephestatic void VmbusProcessChannelEvent(void* channel, int pending); 55250199Sgrehan 56250199Sgrehan/** 57250199Sgrehan * @brief Trigger an event notification on the specified channel 58250199Sgrehan */ 59250199Sgrehanstatic void 60250199Sgrehanvmbus_channel_set_event(hv_vmbus_channel *channel) 61250199Sgrehan{ 62250199Sgrehan hv_vmbus_monitor_page *monitor_page; 63250199Sgrehan 64250199Sgrehan if (channel->offer_msg.monitor_allocated) { 65250199Sgrehan /* Each uint32_t represents 32 channels */ 66250199Sgrehan synch_set_bit((channel->offer_msg.child_rel_id & 31), 67250199Sgrehan ((uint32_t *)hv_vmbus_g_connection.send_interrupt_page 68250199Sgrehan + ((channel->offer_msg.child_rel_id >> 5)))); 69250199Sgrehan 70250199Sgrehan monitor_page = (hv_vmbus_monitor_page *) 71295309Ssephe hv_vmbus_g_connection.monitor_page_2; 72250199Sgrehan 73250199Sgrehan synch_set_bit(channel->monitor_bit, 74250199Sgrehan (uint32_t *)&monitor_page-> 75256276Sdim trigger_group[channel->monitor_group].u.pending); 76250199Sgrehan } else { 77282212Swhu hv_vmbus_set_event(channel); 78250199Sgrehan } 79250199Sgrehan 80250199Sgrehan} 81250199Sgrehan 82250199Sgrehan/** 83250199Sgrehan * @brief Open the specified channel 84250199Sgrehan */ 85250199Sgrehanint 86250199Sgrehanhv_vmbus_channel_open( 87250199Sgrehan hv_vmbus_channel* new_channel, 88250199Sgrehan uint32_t send_ring_buffer_size, 89250199Sgrehan uint32_t recv_ring_buffer_size, 90250199Sgrehan void* user_data, 91250199Sgrehan uint32_t user_data_len, 92250199Sgrehan hv_vmbus_pfn_channel_callback pfn_on_channel_callback, 93250199Sgrehan void* context) 94250199Sgrehan{ 95250199Sgrehan 96250199Sgrehan int ret = 0; 97250199Sgrehan void *in, *out; 98250199Sgrehan hv_vmbus_channel_open_channel* open_msg; 99250199Sgrehan hv_vmbus_channel_msg_info* open_info; 100250199Sgrehan 101282212Swhu mtx_lock(&new_channel->sc_lock); 102282212Swhu if (new_channel->state == HV_CHANNEL_OPEN_STATE) { 103282212Swhu new_channel->state = HV_CHANNEL_OPENING_STATE; 104282212Swhu } else { 105282212Swhu mtx_unlock(&new_channel->sc_lock); 106282212Swhu if(bootverbose) 107282212Swhu printf("VMBUS: Trying to open channel <%p> which in " 108282212Swhu "%d state.\n", new_channel, new_channel->state); 109282212Swhu return (EINVAL); 110282212Swhu } 111282212Swhu mtx_unlock(&new_channel->sc_lock); 112282212Swhu 113250199Sgrehan new_channel->on_channel_callback = pfn_on_channel_callback; 114250199Sgrehan new_channel->channel_callback_context = context; 115250199Sgrehan 116294886Ssephe new_channel->rxq = hv_vmbus_g_context.hv_event_queue[new_channel->target_cpu]; 117294886Ssephe TASK_INIT(&new_channel->channel_task, 0, VmbusProcessChannelEvent, new_channel); 118294886Ssephe 119250199Sgrehan /* Allocate the ring buffer */ 120250199Sgrehan out = contigmalloc((send_ring_buffer_size + recv_ring_buffer_size), 121256350Sgrehan M_DEVBUF, M_ZERO, 0UL, BUS_SPACE_MAXADDR, PAGE_SIZE, 0); 122250199Sgrehan KASSERT(out != NULL, 123250199Sgrehan ("Error VMBUS: contigmalloc failed to allocate Ring Buffer!")); 124250199Sgrehan if (out == NULL) 125256350Sgrehan return (ENOMEM); 126250199Sgrehan 127250199Sgrehan in = ((uint8_t *) out + send_ring_buffer_size); 128250199Sgrehan 129250199Sgrehan new_channel->ring_buffer_pages = out; 130256350Sgrehan new_channel->ring_buffer_page_count = (send_ring_buffer_size + 131256350Sgrehan recv_ring_buffer_size) >> PAGE_SHIFT; 132256350Sgrehan new_channel->ring_buffer_size = send_ring_buffer_size + 133256350Sgrehan recv_ring_buffer_size; 134250199Sgrehan 135250199Sgrehan hv_vmbus_ring_buffer_init( 136250199Sgrehan &new_channel->outbound, 137250199Sgrehan out, 138250199Sgrehan send_ring_buffer_size); 139250199Sgrehan 140250199Sgrehan hv_vmbus_ring_buffer_init( 141250199Sgrehan &new_channel->inbound, 142250199Sgrehan in, 143250199Sgrehan recv_ring_buffer_size); 144250199Sgrehan 145250199Sgrehan /** 146250199Sgrehan * Establish the gpadl for the ring buffer 147250199Sgrehan */ 148250199Sgrehan new_channel->ring_buffer_gpadl_handle = 0; 149250199Sgrehan 150250199Sgrehan ret = hv_vmbus_channel_establish_gpadl(new_channel, 151250199Sgrehan new_channel->outbound.ring_buffer, 152250199Sgrehan send_ring_buffer_size + recv_ring_buffer_size, 153250199Sgrehan &new_channel->ring_buffer_gpadl_handle); 154250199Sgrehan 155250199Sgrehan /** 156250199Sgrehan * Create and init the channel open message 157250199Sgrehan */ 158250199Sgrehan open_info = (hv_vmbus_channel_msg_info*) malloc( 159250199Sgrehan sizeof(hv_vmbus_channel_msg_info) + 160250199Sgrehan sizeof(hv_vmbus_channel_open_channel), 161250199Sgrehan M_DEVBUF, 162250199Sgrehan M_NOWAIT); 163250199Sgrehan KASSERT(open_info != NULL, 164250199Sgrehan ("Error VMBUS: malloc failed to allocate Open Channel message!")); 165250199Sgrehan 166250199Sgrehan if (open_info == NULL) 167250199Sgrehan return (ENOMEM); 168250199Sgrehan 169250199Sgrehan sema_init(&open_info->wait_sema, 0, "Open Info Sema"); 170250199Sgrehan 171250199Sgrehan open_msg = (hv_vmbus_channel_open_channel*) open_info->msg; 172250199Sgrehan open_msg->header.message_type = HV_CHANNEL_MESSAGE_OPEN_CHANNEL; 173250199Sgrehan open_msg->open_id = new_channel->offer_msg.child_rel_id; 174250199Sgrehan open_msg->child_rel_id = new_channel->offer_msg.child_rel_id; 175250199Sgrehan open_msg->ring_buffer_gpadl_handle = 176250199Sgrehan new_channel->ring_buffer_gpadl_handle; 177250199Sgrehan open_msg->downstream_ring_buffer_page_offset = send_ring_buffer_size 178250199Sgrehan >> PAGE_SHIFT; 179282212Swhu open_msg->target_vcpu = new_channel->target_vcpu; 180250199Sgrehan 181250199Sgrehan if (user_data_len) 182250199Sgrehan memcpy(open_msg->user_data, user_data, user_data_len); 183250199Sgrehan 184250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 185250199Sgrehan TAILQ_INSERT_TAIL( 186250199Sgrehan &hv_vmbus_g_connection.channel_msg_anchor, 187250199Sgrehan open_info, 188250199Sgrehan msg_list_entry); 189250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 190250199Sgrehan 191250199Sgrehan ret = hv_vmbus_post_message( 192250199Sgrehan open_msg, sizeof(hv_vmbus_channel_open_channel)); 193250199Sgrehan 194250199Sgrehan if (ret != 0) 195250199Sgrehan goto cleanup; 196250199Sgrehan 197250199Sgrehan ret = sema_timedwait(&open_info->wait_sema, 500); /* KYS 5 seconds */ 198250199Sgrehan 199282212Swhu if (ret) { 200282212Swhu if(bootverbose) 201282212Swhu printf("VMBUS: channel <%p> open timeout.\n", new_channel); 202250199Sgrehan goto cleanup; 203282212Swhu } 204250199Sgrehan 205250199Sgrehan if (open_info->response.open_result.status == 0) { 206282212Swhu new_channel->state = HV_CHANNEL_OPENED_STATE; 207250199Sgrehan if(bootverbose) 208250199Sgrehan printf("VMBUS: channel <%p> open success.\n", new_channel); 209250199Sgrehan } else { 210250199Sgrehan if(bootverbose) 211250199Sgrehan printf("Error VMBUS: channel <%p> open failed - %d!\n", 212250199Sgrehan new_channel, open_info->response.open_result.status); 213250199Sgrehan } 214250199Sgrehan 215250199Sgrehan cleanup: 216250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 217250199Sgrehan TAILQ_REMOVE( 218250199Sgrehan &hv_vmbus_g_connection.channel_msg_anchor, 219250199Sgrehan open_info, 220250199Sgrehan msg_list_entry); 221250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 222250199Sgrehan sema_destroy(&open_info->wait_sema); 223250199Sgrehan free(open_info, M_DEVBUF); 224250199Sgrehan 225250199Sgrehan return (ret); 226250199Sgrehan} 227250199Sgrehan 228250199Sgrehan/** 229250199Sgrehan * @brief Create a gpadl for the specified buffer 230250199Sgrehan */ 231250199Sgrehanstatic int 232250199Sgrehanvmbus_channel_create_gpadl_header( 233250199Sgrehan void* contig_buffer, 234250199Sgrehan uint32_t size, /* page-size multiple */ 235250199Sgrehan hv_vmbus_channel_msg_info** msg_info, 236250199Sgrehan uint32_t* message_count) 237250199Sgrehan{ 238250199Sgrehan int i; 239250199Sgrehan int page_count; 240250199Sgrehan unsigned long long pfn; 241250199Sgrehan uint32_t msg_size; 242250199Sgrehan hv_vmbus_channel_gpadl_header* gpa_header; 243250199Sgrehan hv_vmbus_channel_gpadl_body* gpadl_body; 244250199Sgrehan hv_vmbus_channel_msg_info* msg_header; 245250199Sgrehan hv_vmbus_channel_msg_info* msg_body; 246250199Sgrehan 247250199Sgrehan int pfnSum, pfnCount, pfnLeft, pfnCurr, pfnSize; 248250199Sgrehan 249250199Sgrehan page_count = size >> PAGE_SHIFT; 250250199Sgrehan pfn = hv_get_phys_addr(contig_buffer) >> PAGE_SHIFT; 251250199Sgrehan 252250199Sgrehan /*do we need a gpadl body msg */ 253250199Sgrehan pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE 254250199Sgrehan - sizeof(hv_vmbus_channel_gpadl_header) 255250199Sgrehan - sizeof(hv_gpa_range); 256250199Sgrehan pfnCount = pfnSize / sizeof(uint64_t); 257250199Sgrehan 258250199Sgrehan if (page_count > pfnCount) { /* if(we need a gpadl body) */ 259250199Sgrehan /* fill in the header */ 260250199Sgrehan msg_size = sizeof(hv_vmbus_channel_msg_info) 261250199Sgrehan + sizeof(hv_vmbus_channel_gpadl_header) 262250199Sgrehan + sizeof(hv_gpa_range) 263250199Sgrehan + pfnCount * sizeof(uint64_t); 264250199Sgrehan msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); 265250199Sgrehan KASSERT( 266250199Sgrehan msg_header != NULL, 267250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl Message!")); 268250199Sgrehan if (msg_header == NULL) 269250199Sgrehan return (ENOMEM); 270250199Sgrehan 271250199Sgrehan TAILQ_INIT(&msg_header->sub_msg_list_anchor); 272250199Sgrehan msg_header->message_size = msg_size; 273250199Sgrehan 274250199Sgrehan gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg; 275250199Sgrehan gpa_header->range_count = 1; 276250199Sgrehan gpa_header->range_buf_len = sizeof(hv_gpa_range) 277250199Sgrehan + page_count * sizeof(uint64_t); 278250199Sgrehan gpa_header->range[0].byte_offset = 0; 279250199Sgrehan gpa_header->range[0].byte_count = size; 280250199Sgrehan for (i = 0; i < pfnCount; i++) { 281250199Sgrehan gpa_header->range[0].pfn_array[i] = pfn + i; 282250199Sgrehan } 283250199Sgrehan *msg_info = msg_header; 284250199Sgrehan *message_count = 1; 285250199Sgrehan 286250199Sgrehan pfnSum = pfnCount; 287250199Sgrehan pfnLeft = page_count - pfnCount; 288250199Sgrehan 289250199Sgrehan /* 290250199Sgrehan * figure out how many pfns we can fit 291250199Sgrehan */ 292250199Sgrehan pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE 293250199Sgrehan - sizeof(hv_vmbus_channel_gpadl_body); 294250199Sgrehan pfnCount = pfnSize / sizeof(uint64_t); 295250199Sgrehan 296250199Sgrehan /* 297250199Sgrehan * fill in the body 298250199Sgrehan */ 299250199Sgrehan while (pfnLeft) { 300250199Sgrehan if (pfnLeft > pfnCount) { 301250199Sgrehan pfnCurr = pfnCount; 302250199Sgrehan } else { 303250199Sgrehan pfnCurr = pfnLeft; 304250199Sgrehan } 305250199Sgrehan 306250199Sgrehan msg_size = sizeof(hv_vmbus_channel_msg_info) + 307250199Sgrehan sizeof(hv_vmbus_channel_gpadl_body) + 308250199Sgrehan pfnCurr * sizeof(uint64_t); 309250199Sgrehan msg_body = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); 310250199Sgrehan KASSERT( 311250199Sgrehan msg_body != NULL, 312250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl msg_body!")); 313250199Sgrehan if (msg_body == NULL) 314250199Sgrehan return (ENOMEM); 315250199Sgrehan 316250199Sgrehan msg_body->message_size = msg_size; 317250199Sgrehan (*message_count)++; 318250199Sgrehan gpadl_body = 319250199Sgrehan (hv_vmbus_channel_gpadl_body*) msg_body->msg; 320250199Sgrehan /* 321250199Sgrehan * gpadl_body->gpadl = kbuffer; 322250199Sgrehan */ 323250199Sgrehan for (i = 0; i < pfnCurr; i++) { 324250199Sgrehan gpadl_body->pfn[i] = pfn + pfnSum + i; 325250199Sgrehan } 326250199Sgrehan 327250199Sgrehan TAILQ_INSERT_TAIL( 328250199Sgrehan &msg_header->sub_msg_list_anchor, 329250199Sgrehan msg_body, 330250199Sgrehan msg_list_entry); 331250199Sgrehan pfnSum += pfnCurr; 332250199Sgrehan pfnLeft -= pfnCurr; 333250199Sgrehan } 334250199Sgrehan } else { /* else everything fits in a header */ 335250199Sgrehan 336250199Sgrehan msg_size = sizeof(hv_vmbus_channel_msg_info) + 337250199Sgrehan sizeof(hv_vmbus_channel_gpadl_header) + 338250199Sgrehan sizeof(hv_gpa_range) + 339250199Sgrehan page_count * sizeof(uint64_t); 340250199Sgrehan msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); 341250199Sgrehan KASSERT( 342250199Sgrehan msg_header != NULL, 343250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl Message!")); 344250199Sgrehan if (msg_header == NULL) 345250199Sgrehan return (ENOMEM); 346250199Sgrehan 347250199Sgrehan msg_header->message_size = msg_size; 348250199Sgrehan 349250199Sgrehan gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg; 350250199Sgrehan gpa_header->range_count = 1; 351250199Sgrehan gpa_header->range_buf_len = sizeof(hv_gpa_range) + 352250199Sgrehan page_count * sizeof(uint64_t); 353250199Sgrehan gpa_header->range[0].byte_offset = 0; 354250199Sgrehan gpa_header->range[0].byte_count = size; 355250199Sgrehan for (i = 0; i < page_count; i++) { 356250199Sgrehan gpa_header->range[0].pfn_array[i] = pfn + i; 357250199Sgrehan } 358250199Sgrehan 359250199Sgrehan *msg_info = msg_header; 360250199Sgrehan *message_count = 1; 361250199Sgrehan } 362250199Sgrehan 363250199Sgrehan return (0); 364250199Sgrehan} 365250199Sgrehan 366250199Sgrehan/** 367250199Sgrehan * @brief Establish a GPADL for the specified buffer 368250199Sgrehan */ 369250199Sgrehanint 370250199Sgrehanhv_vmbus_channel_establish_gpadl( 371250199Sgrehan hv_vmbus_channel* channel, 372250199Sgrehan void* contig_buffer, 373250199Sgrehan uint32_t size, /* page-size multiple */ 374250199Sgrehan uint32_t* gpadl_handle) 375250199Sgrehan 376250199Sgrehan{ 377250199Sgrehan int ret = 0; 378250199Sgrehan hv_vmbus_channel_gpadl_header* gpadl_msg; 379250199Sgrehan hv_vmbus_channel_gpadl_body* gpadl_body; 380250199Sgrehan hv_vmbus_channel_msg_info* msg_info; 381250199Sgrehan hv_vmbus_channel_msg_info* sub_msg_info; 382250199Sgrehan uint32_t msg_count; 383250199Sgrehan hv_vmbus_channel_msg_info* curr; 384250199Sgrehan uint32_t next_gpadl_handle; 385250199Sgrehan 386250199Sgrehan next_gpadl_handle = hv_vmbus_g_connection.next_gpadl_handle; 387250199Sgrehan atomic_add_int((int*) &hv_vmbus_g_connection.next_gpadl_handle, 1); 388250199Sgrehan 389250199Sgrehan ret = vmbus_channel_create_gpadl_header( 390250199Sgrehan contig_buffer, size, &msg_info, &msg_count); 391250199Sgrehan 392250199Sgrehan if(ret != 0) { /* if(allocation failed) return immediately */ 393250199Sgrehan /* reverse atomic_add_int above */ 394250199Sgrehan atomic_subtract_int((int*) 395250199Sgrehan &hv_vmbus_g_connection.next_gpadl_handle, 1); 396250199Sgrehan return ret; 397250199Sgrehan } 398250199Sgrehan 399250199Sgrehan sema_init(&msg_info->wait_sema, 0, "Open Info Sema"); 400250199Sgrehan gpadl_msg = (hv_vmbus_channel_gpadl_header*) msg_info->msg; 401250199Sgrehan gpadl_msg->header.message_type = HV_CHANNEL_MESSAGEL_GPADL_HEADER; 402250199Sgrehan gpadl_msg->child_rel_id = channel->offer_msg.child_rel_id; 403250199Sgrehan gpadl_msg->gpadl = next_gpadl_handle; 404250199Sgrehan 405250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 406250199Sgrehan TAILQ_INSERT_TAIL( 407250199Sgrehan &hv_vmbus_g_connection.channel_msg_anchor, 408250199Sgrehan msg_info, 409250199Sgrehan msg_list_entry); 410250199Sgrehan 411250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 412250199Sgrehan 413250199Sgrehan ret = hv_vmbus_post_message( 414250199Sgrehan gpadl_msg, 415250199Sgrehan msg_info->message_size - 416250199Sgrehan (uint32_t) sizeof(hv_vmbus_channel_msg_info)); 417250199Sgrehan 418250199Sgrehan if (ret != 0) 419250199Sgrehan goto cleanup; 420250199Sgrehan 421250199Sgrehan if (msg_count > 1) { 422250199Sgrehan TAILQ_FOREACH(curr, 423250199Sgrehan &msg_info->sub_msg_list_anchor, msg_list_entry) { 424250199Sgrehan sub_msg_info = curr; 425250199Sgrehan gpadl_body = 426250199Sgrehan (hv_vmbus_channel_gpadl_body*) sub_msg_info->msg; 427250199Sgrehan 428250199Sgrehan gpadl_body->header.message_type = 429250199Sgrehan HV_CHANNEL_MESSAGE_GPADL_BODY; 430250199Sgrehan gpadl_body->gpadl = next_gpadl_handle; 431250199Sgrehan 432250199Sgrehan ret = hv_vmbus_post_message( 433250199Sgrehan gpadl_body, 434250199Sgrehan sub_msg_info->message_size 435250199Sgrehan - (uint32_t) sizeof(hv_vmbus_channel_msg_info)); 436250199Sgrehan /* if (the post message failed) give up and clean up */ 437250199Sgrehan if(ret != 0) 438250199Sgrehan goto cleanup; 439250199Sgrehan } 440250199Sgrehan } 441250199Sgrehan 442250199Sgrehan ret = sema_timedwait(&msg_info->wait_sema, 500); /* KYS 5 seconds*/ 443250199Sgrehan if (ret != 0) 444250199Sgrehan goto cleanup; 445250199Sgrehan 446250199Sgrehan *gpadl_handle = gpadl_msg->gpadl; 447250199Sgrehan 448250199Sgrehancleanup: 449250199Sgrehan 450250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 451250199Sgrehan TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor, 452250199Sgrehan msg_info, msg_list_entry); 453250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 454250199Sgrehan 455250199Sgrehan sema_destroy(&msg_info->wait_sema); 456250199Sgrehan free(msg_info, M_DEVBUF); 457250199Sgrehan 458250199Sgrehan return (ret); 459250199Sgrehan} 460250199Sgrehan 461250199Sgrehan/** 462250199Sgrehan * @brief Teardown the specified GPADL handle 463250199Sgrehan */ 464250199Sgrehanint 465250199Sgrehanhv_vmbus_channel_teardown_gpdal( 466250199Sgrehan hv_vmbus_channel* channel, 467250199Sgrehan uint32_t gpadl_handle) 468250199Sgrehan{ 469250199Sgrehan int ret = 0; 470250199Sgrehan hv_vmbus_channel_gpadl_teardown* msg; 471250199Sgrehan hv_vmbus_channel_msg_info* info; 472250199Sgrehan 473250199Sgrehan info = (hv_vmbus_channel_msg_info *) 474250199Sgrehan malloc( sizeof(hv_vmbus_channel_msg_info) + 475250199Sgrehan sizeof(hv_vmbus_channel_gpadl_teardown), 476250199Sgrehan M_DEVBUF, M_NOWAIT); 477250199Sgrehan KASSERT(info != NULL, 478250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl Teardown Msg!")); 479250199Sgrehan if (info == NULL) { 480250199Sgrehan ret = ENOMEM; 481250199Sgrehan goto cleanup; 482250199Sgrehan } 483250199Sgrehan 484250199Sgrehan sema_init(&info->wait_sema, 0, "Open Info Sema"); 485250199Sgrehan 486250199Sgrehan msg = (hv_vmbus_channel_gpadl_teardown*) info->msg; 487250199Sgrehan 488250199Sgrehan msg->header.message_type = HV_CHANNEL_MESSAGE_GPADL_TEARDOWN; 489250199Sgrehan msg->child_rel_id = channel->offer_msg.child_rel_id; 490250199Sgrehan msg->gpadl = gpadl_handle; 491250199Sgrehan 492250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 493250199Sgrehan TAILQ_INSERT_TAIL(&hv_vmbus_g_connection.channel_msg_anchor, 494250199Sgrehan info, msg_list_entry); 495250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 496250199Sgrehan 497250199Sgrehan ret = hv_vmbus_post_message(msg, 498250199Sgrehan sizeof(hv_vmbus_channel_gpadl_teardown)); 499250199Sgrehan if (ret != 0) 500250199Sgrehan goto cleanup; 501250199Sgrehan 502250199Sgrehan ret = sema_timedwait(&info->wait_sema, 500); /* KYS 5 seconds */ 503250199Sgrehan 504250199Sgrehancleanup: 505250199Sgrehan /* 506250199Sgrehan * Received a torndown response 507250199Sgrehan */ 508250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 509250199Sgrehan TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor, 510250199Sgrehan info, msg_list_entry); 511250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 512250199Sgrehan sema_destroy(&info->wait_sema); 513250199Sgrehan free(info, M_DEVBUF); 514250199Sgrehan 515250199Sgrehan return (ret); 516250199Sgrehan} 517250199Sgrehan 518282212Swhustatic void 519282212Swhuhv_vmbus_channel_close_internal(hv_vmbus_channel *channel) 520250199Sgrehan{ 521250199Sgrehan int ret = 0; 522294886Ssephe struct taskqueue *rxq = channel->rxq; 523250199Sgrehan hv_vmbus_channel_close_channel* msg; 524250199Sgrehan hv_vmbus_channel_msg_info* info; 525250199Sgrehan 526282212Swhu channel->state = HV_CHANNEL_OPEN_STATE; 527282212Swhu channel->sc_creation_callback = NULL; 528282212Swhu 529282212Swhu /* 530294886Ssephe * set rxq to NULL to avoid more requests be scheduled 531294886Ssephe */ 532294886Ssephe channel->rxq = NULL; 533294886Ssephe taskqueue_drain(rxq, &channel->channel_task); 534294886Ssephe /* 535282212Swhu * Grab the lock to prevent race condition when a packet received 536282212Swhu * and unloading driver is in the process. 537282212Swhu */ 538250199Sgrehan mtx_lock(&channel->inbound_lock); 539250199Sgrehan channel->on_channel_callback = NULL; 540250199Sgrehan mtx_unlock(&channel->inbound_lock); 541250199Sgrehan 542250199Sgrehan /** 543250199Sgrehan * Send a closing message 544250199Sgrehan */ 545250199Sgrehan info = (hv_vmbus_channel_msg_info *) 546250199Sgrehan malloc( sizeof(hv_vmbus_channel_msg_info) + 547250199Sgrehan sizeof(hv_vmbus_channel_close_channel), 548250199Sgrehan M_DEVBUF, M_NOWAIT); 549250199Sgrehan KASSERT(info != NULL, ("VMBUS: malloc failed hv_vmbus_channel_close!")); 550250199Sgrehan if(info == NULL) 551250199Sgrehan return; 552250199Sgrehan 553250199Sgrehan msg = (hv_vmbus_channel_close_channel*) info->msg; 554250199Sgrehan msg->header.message_type = HV_CHANNEL_MESSAGE_CLOSE_CHANNEL; 555250199Sgrehan msg->child_rel_id = channel->offer_msg.child_rel_id; 556250199Sgrehan 557250199Sgrehan ret = hv_vmbus_post_message( 558250199Sgrehan msg, sizeof(hv_vmbus_channel_close_channel)); 559250199Sgrehan 560250199Sgrehan /* Tear down the gpadl for the channel's ring buffer */ 561250199Sgrehan if (channel->ring_buffer_gpadl_handle) { 562250199Sgrehan hv_vmbus_channel_teardown_gpdal(channel, 563250199Sgrehan channel->ring_buffer_gpadl_handle); 564250199Sgrehan } 565250199Sgrehan 566250199Sgrehan /* TODO: Send a msg to release the childRelId */ 567250199Sgrehan 568250199Sgrehan /* cleanup the ring buffers for this channel */ 569250199Sgrehan hv_ring_buffer_cleanup(&channel->outbound); 570250199Sgrehan hv_ring_buffer_cleanup(&channel->inbound); 571250199Sgrehan 572256350Sgrehan contigfree(channel->ring_buffer_pages, channel->ring_buffer_size, 573256350Sgrehan M_DEVBUF); 574250199Sgrehan 575250199Sgrehan free(info, M_DEVBUF); 576282212Swhu} 577250199Sgrehan 578282212Swhu/** 579282212Swhu * @brief Close the specified channel 580282212Swhu */ 581282212Swhuvoid 582282212Swhuhv_vmbus_channel_close(hv_vmbus_channel *channel) 583282212Swhu{ 584282212Swhu hv_vmbus_channel* sub_channel; 585282212Swhu 586282212Swhu if (channel->primary_channel != NULL) { 587282212Swhu /* 588282212Swhu * We only close multi-channels when the primary is 589282212Swhu * closed. 590282212Swhu */ 591282212Swhu return; 592282212Swhu } 593282212Swhu 594250199Sgrehan /* 595282212Swhu * Close all multi-channels first. 596250199Sgrehan */ 597282212Swhu TAILQ_FOREACH(sub_channel, &channel->sc_list_anchor, 598282212Swhu sc_list_entry) { 599282212Swhu if (sub_channel->state != HV_CHANNEL_OPENED_STATE) 600282212Swhu continue; 601282212Swhu hv_vmbus_channel_close_internal(sub_channel); 602250199Sgrehan } 603282212Swhu /* 604282212Swhu * Then close the primary channel. 605282212Swhu */ 606282212Swhu hv_vmbus_channel_close_internal(channel); 607250199Sgrehan} 608250199Sgrehan 609250199Sgrehan/** 610250199Sgrehan * @brief Send the specified buffer on the given channel 611250199Sgrehan */ 612250199Sgrehanint 613250199Sgrehanhv_vmbus_channel_send_packet( 614250199Sgrehan hv_vmbus_channel* channel, 615250199Sgrehan void* buffer, 616250199Sgrehan uint32_t buffer_len, 617250199Sgrehan uint64_t request_id, 618250199Sgrehan hv_vmbus_packet_type type, 619250199Sgrehan uint32_t flags) 620250199Sgrehan{ 621250199Sgrehan int ret = 0; 622250199Sgrehan hv_vm_packet_descriptor desc; 623250199Sgrehan uint32_t packet_len; 624250199Sgrehan uint64_t aligned_data; 625250199Sgrehan uint32_t packet_len_aligned; 626282212Swhu boolean_t need_sig; 627250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 628250199Sgrehan 629250199Sgrehan packet_len = sizeof(hv_vm_packet_descriptor) + buffer_len; 630250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 631250199Sgrehan aligned_data = 0; 632250199Sgrehan 633250199Sgrehan /* Setup the descriptor */ 634250199Sgrehan desc.type = type; /* HV_VMBUS_PACKET_TYPE_DATA_IN_BAND; */ 635250199Sgrehan desc.flags = flags; /* HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED */ 636250199Sgrehan /* in 8-bytes granularity */ 637250199Sgrehan desc.data_offset8 = sizeof(hv_vm_packet_descriptor) >> 3; 638250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 639250199Sgrehan desc.transaction_id = request_id; 640250199Sgrehan 641250199Sgrehan buffer_list[0].data = &desc; 642250199Sgrehan buffer_list[0].length = sizeof(hv_vm_packet_descriptor); 643250199Sgrehan 644250199Sgrehan buffer_list[1].data = buffer; 645250199Sgrehan buffer_list[1].length = buffer_len; 646250199Sgrehan 647250199Sgrehan buffer_list[2].data = &aligned_data; 648250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 649250199Sgrehan 650282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 651282212Swhu &need_sig); 652250199Sgrehan 653250199Sgrehan /* TODO: We should determine if this is optional */ 654282212Swhu if (ret == 0 && need_sig) { 655250199Sgrehan vmbus_channel_set_event(channel); 656250199Sgrehan } 657250199Sgrehan 658250199Sgrehan return (ret); 659250199Sgrehan} 660250199Sgrehan 661250199Sgrehan/** 662250199Sgrehan * @brief Send a range of single-page buffer packets using 663250199Sgrehan * a GPADL Direct packet type 664250199Sgrehan */ 665250199Sgrehanint 666250199Sgrehanhv_vmbus_channel_send_packet_pagebuffer( 667250199Sgrehan hv_vmbus_channel* channel, 668250199Sgrehan hv_vmbus_page_buffer page_buffers[], 669250199Sgrehan uint32_t page_count, 670250199Sgrehan void* buffer, 671250199Sgrehan uint32_t buffer_len, 672250199Sgrehan uint64_t request_id) 673250199Sgrehan{ 674250199Sgrehan 675250199Sgrehan int ret = 0; 676282212Swhu boolean_t need_sig; 677250199Sgrehan uint32_t packet_len; 678294705Ssephe uint32_t page_buflen; 679250199Sgrehan uint32_t packetLen_aligned; 680294705Ssephe hv_vmbus_sg_buffer_list buffer_list[4]; 681250199Sgrehan hv_vmbus_channel_packet_page_buffer desc; 682250199Sgrehan uint32_t descSize; 683250199Sgrehan uint64_t alignedData = 0; 684250199Sgrehan 685250199Sgrehan if (page_count > HV_MAX_PAGE_BUFFER_COUNT) 686250199Sgrehan return (EINVAL); 687250199Sgrehan 688250199Sgrehan /* 689250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_page_buffer 690250199Sgrehan * is the largest size we support 691250199Sgrehan */ 692294705Ssephe descSize = __offsetof(hv_vmbus_channel_packet_page_buffer, range); 693294705Ssephe page_buflen = sizeof(hv_vmbus_page_buffer) * page_count; 694294705Ssephe packet_len = descSize + page_buflen + buffer_len; 695250199Sgrehan packetLen_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 696250199Sgrehan 697250199Sgrehan /* Setup the descriptor */ 698250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 699250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 700294705Ssephe /* in 8-bytes granularity */ 701294705Ssephe desc.data_offset8 = (descSize + page_buflen) >> 3; 702250199Sgrehan desc.length8 = (uint16_t) (packetLen_aligned >> 3); 703250199Sgrehan desc.transaction_id = request_id; 704250199Sgrehan desc.range_count = page_count; 705250199Sgrehan 706250199Sgrehan buffer_list[0].data = &desc; 707250199Sgrehan buffer_list[0].length = descSize; 708250199Sgrehan 709294705Ssephe buffer_list[1].data = page_buffers; 710294705Ssephe buffer_list[1].length = page_buflen; 711250199Sgrehan 712294705Ssephe buffer_list[2].data = buffer; 713294705Ssephe buffer_list[2].length = buffer_len; 714250199Sgrehan 715294705Ssephe buffer_list[3].data = &alignedData; 716294705Ssephe buffer_list[3].length = packetLen_aligned - packet_len; 717294705Ssephe 718294705Ssephe ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 4, 719282212Swhu &need_sig); 720250199Sgrehan 721250199Sgrehan /* TODO: We should determine if this is optional */ 722282212Swhu if (ret == 0 && need_sig) { 723250199Sgrehan vmbus_channel_set_event(channel); 724250199Sgrehan } 725250199Sgrehan 726250199Sgrehan return (ret); 727250199Sgrehan} 728250199Sgrehan 729250199Sgrehan/** 730250199Sgrehan * @brief Send a multi-page buffer packet using a GPADL Direct packet type 731250199Sgrehan */ 732250199Sgrehanint 733250199Sgrehanhv_vmbus_channel_send_packet_multipagebuffer( 734250199Sgrehan hv_vmbus_channel* channel, 735250199Sgrehan hv_vmbus_multipage_buffer* multi_page_buffer, 736250199Sgrehan void* buffer, 737250199Sgrehan uint32_t buffer_len, 738250199Sgrehan uint64_t request_id) 739250199Sgrehan{ 740250199Sgrehan 741250199Sgrehan int ret = 0; 742250199Sgrehan uint32_t desc_size; 743282212Swhu boolean_t need_sig; 744250199Sgrehan uint32_t packet_len; 745250199Sgrehan uint32_t packet_len_aligned; 746250199Sgrehan uint32_t pfn_count; 747250199Sgrehan uint64_t aligned_data = 0; 748250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 749250199Sgrehan hv_vmbus_channel_packet_multipage_buffer desc; 750250199Sgrehan 751250199Sgrehan pfn_count = 752250199Sgrehan HV_NUM_PAGES_SPANNED( 753250199Sgrehan multi_page_buffer->offset, 754250199Sgrehan multi_page_buffer->length); 755250199Sgrehan 756250199Sgrehan if ((pfn_count == 0) || (pfn_count > HV_MAX_MULTIPAGE_BUFFER_COUNT)) 757250199Sgrehan return (EINVAL); 758250199Sgrehan /* 759250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_multipage_buffer 760250199Sgrehan * is the largest size we support 761250199Sgrehan */ 762250199Sgrehan desc_size = 763250199Sgrehan sizeof(hv_vmbus_channel_packet_multipage_buffer) - 764250199Sgrehan ((HV_MAX_MULTIPAGE_BUFFER_COUNT - pfn_count) * 765250199Sgrehan sizeof(uint64_t)); 766250199Sgrehan packet_len = desc_size + buffer_len; 767250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 768250199Sgrehan 769250199Sgrehan /* 770250199Sgrehan * Setup the descriptor 771250199Sgrehan */ 772250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 773250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 774250199Sgrehan desc.data_offset8 = desc_size >> 3; /* in 8-bytes granularity */ 775250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 776250199Sgrehan desc.transaction_id = request_id; 777250199Sgrehan desc.range_count = 1; 778250199Sgrehan 779250199Sgrehan desc.range.length = multi_page_buffer->length; 780250199Sgrehan desc.range.offset = multi_page_buffer->offset; 781250199Sgrehan 782250199Sgrehan memcpy(desc.range.pfn_array, multi_page_buffer->pfn_array, 783250199Sgrehan pfn_count * sizeof(uint64_t)); 784250199Sgrehan 785250199Sgrehan buffer_list[0].data = &desc; 786250199Sgrehan buffer_list[0].length = desc_size; 787250199Sgrehan 788250199Sgrehan buffer_list[1].data = buffer; 789250199Sgrehan buffer_list[1].length = buffer_len; 790250199Sgrehan 791250199Sgrehan buffer_list[2].data = &aligned_data; 792250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 793250199Sgrehan 794282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 795282212Swhu &need_sig); 796250199Sgrehan 797250199Sgrehan /* TODO: We should determine if this is optional */ 798282212Swhu if (ret == 0 && need_sig) { 799250199Sgrehan vmbus_channel_set_event(channel); 800250199Sgrehan } 801250199Sgrehan 802250199Sgrehan return (ret); 803250199Sgrehan} 804250199Sgrehan 805250199Sgrehan/** 806250199Sgrehan * @brief Retrieve the user packet on the specified channel 807250199Sgrehan */ 808250199Sgrehanint 809250199Sgrehanhv_vmbus_channel_recv_packet( 810250199Sgrehan hv_vmbus_channel* channel, 811250199Sgrehan void* Buffer, 812250199Sgrehan uint32_t buffer_len, 813250199Sgrehan uint32_t* buffer_actual_len, 814250199Sgrehan uint64_t* request_id) 815250199Sgrehan{ 816250199Sgrehan int ret; 817250199Sgrehan uint32_t user_len; 818250199Sgrehan uint32_t packet_len; 819250199Sgrehan hv_vm_packet_descriptor desc; 820250199Sgrehan 821250199Sgrehan *buffer_actual_len = 0; 822250199Sgrehan *request_id = 0; 823250199Sgrehan 824250199Sgrehan ret = hv_ring_buffer_peek(&channel->inbound, &desc, 825250199Sgrehan sizeof(hv_vm_packet_descriptor)); 826250199Sgrehan if (ret != 0) 827250199Sgrehan return (0); 828250199Sgrehan 829250199Sgrehan packet_len = desc.length8 << 3; 830250199Sgrehan user_len = packet_len - (desc.data_offset8 << 3); 831250199Sgrehan 832250199Sgrehan *buffer_actual_len = user_len; 833250199Sgrehan 834250199Sgrehan if (user_len > buffer_len) 835250199Sgrehan return (EINVAL); 836250199Sgrehan 837250199Sgrehan *request_id = desc.transaction_id; 838250199Sgrehan 839250199Sgrehan /* Copy over the packet to the user buffer */ 840250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, Buffer, user_len, 841250199Sgrehan (desc.data_offset8 << 3)); 842250199Sgrehan 843250199Sgrehan return (0); 844250199Sgrehan} 845250199Sgrehan 846250199Sgrehan/** 847250199Sgrehan * @brief Retrieve the raw packet on the specified channel 848250199Sgrehan */ 849250199Sgrehanint 850250199Sgrehanhv_vmbus_channel_recv_packet_raw( 851250199Sgrehan hv_vmbus_channel* channel, 852250199Sgrehan void* buffer, 853250199Sgrehan uint32_t buffer_len, 854250199Sgrehan uint32_t* buffer_actual_len, 855250199Sgrehan uint64_t* request_id) 856250199Sgrehan{ 857250199Sgrehan int ret; 858250199Sgrehan uint32_t packetLen; 859250199Sgrehan uint32_t userLen; 860250199Sgrehan hv_vm_packet_descriptor desc; 861250199Sgrehan 862250199Sgrehan *buffer_actual_len = 0; 863250199Sgrehan *request_id = 0; 864250199Sgrehan 865250199Sgrehan ret = hv_ring_buffer_peek( 866250199Sgrehan &channel->inbound, &desc, 867250199Sgrehan sizeof(hv_vm_packet_descriptor)); 868250199Sgrehan 869250199Sgrehan if (ret != 0) 870250199Sgrehan return (0); 871250199Sgrehan 872250199Sgrehan packetLen = desc.length8 << 3; 873250199Sgrehan userLen = packetLen - (desc.data_offset8 << 3); 874250199Sgrehan 875250199Sgrehan *buffer_actual_len = packetLen; 876250199Sgrehan 877250199Sgrehan if (packetLen > buffer_len) 878250199Sgrehan return (ENOBUFS); 879250199Sgrehan 880250199Sgrehan *request_id = desc.transaction_id; 881250199Sgrehan 882250199Sgrehan /* Copy over the entire packet to the user buffer */ 883250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0); 884250199Sgrehan 885250199Sgrehan return (0); 886250199Sgrehan} 887294886Ssephe 888294886Ssephe 889294886Ssephe/** 890294886Ssephe * Process a channel event notification 891294886Ssephe */ 892294886Ssephestatic void 893294886SsepheVmbusProcessChannelEvent(void* context, int pending) 894294886Ssephe{ 895294886Ssephe void* arg; 896294886Ssephe uint32_t bytes_to_read; 897294886Ssephe hv_vmbus_channel* channel = (hv_vmbus_channel*)context; 898294886Ssephe boolean_t is_batched_reading; 899294886Ssephe 900294886Ssephe /** 901294886Ssephe * Find the channel based on this relid and invokes 902294886Ssephe * the channel callback to process the event 903294886Ssephe */ 904294886Ssephe 905294886Ssephe if (channel == NULL) { 906294886Ssephe return; 907294886Ssephe } 908294886Ssephe /** 909294886Ssephe * To deal with the race condition where we might 910294886Ssephe * receive a packet while the relevant driver is 911294886Ssephe * being unloaded, dispatch the callback while 912294886Ssephe * holding the channel lock. The unloading driver 913294886Ssephe * will acquire the same channel lock to set the 914294886Ssephe * callback to NULL. This closes the window. 915294886Ssephe */ 916294886Ssephe 917294886Ssephe /* 918294886Ssephe * Disable the lock due to newly added WITNESS check in r277723. 919294886Ssephe * Will seek other way to avoid race condition. 920294886Ssephe * -- whu 921294886Ssephe */ 922294886Ssephe // mtx_lock(&channel->inbound_lock); 923294886Ssephe if (channel->on_channel_callback != NULL) { 924294886Ssephe arg = channel->channel_callback_context; 925294886Ssephe is_batched_reading = channel->batched_reading; 926294886Ssephe /* 927294886Ssephe * Optimize host to guest signaling by ensuring: 928294886Ssephe * 1. While reading the channel, we disable interrupts from 929294886Ssephe * host. 930294886Ssephe * 2. Ensure that we process all posted messages from the host 931294886Ssephe * before returning from this callback. 932294886Ssephe * 3. Once we return, enable signaling from the host. Once this 933294886Ssephe * state is set we check to see if additional packets are 934294886Ssephe * available to read. In this case we repeat the process. 935294886Ssephe */ 936294886Ssephe do { 937294886Ssephe if (is_batched_reading) 938294886Ssephe hv_ring_buffer_read_begin(&channel->inbound); 939294886Ssephe 940294886Ssephe channel->on_channel_callback(arg); 941294886Ssephe 942294886Ssephe if (is_batched_reading) 943294886Ssephe bytes_to_read = 944294886Ssephe hv_ring_buffer_read_end(&channel->inbound); 945294886Ssephe else 946294886Ssephe bytes_to_read = 0; 947294886Ssephe } while (is_batched_reading && (bytes_to_read != 0)); 948294886Ssephe } 949294886Ssephe // mtx_unlock(&channel->inbound_lock); 950294886Ssephe} 951