vmbus_chan.c revision 296028
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 296028 2016-02-25 09:27:50Z 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> 39250199Sgrehan#include <machine/bus.h> 40250199Sgrehan#include <vm/vm.h> 41250199Sgrehan#include <vm/vm_param.h> 42250199Sgrehan#include <vm/pmap.h> 43250199Sgrehan 44250199Sgrehan#include "hv_vmbus_priv.h" 45250199Sgrehan 46250199Sgrehanstatic int vmbus_channel_create_gpadl_header( 47250199Sgrehan /* must be phys and virt contiguous*/ 48250199Sgrehan void* contig_buffer, 49250199Sgrehan /* page-size multiple */ 50250199Sgrehan uint32_t size, 51250199Sgrehan hv_vmbus_channel_msg_info** msg_info, 52250199Sgrehan uint32_t* message_count); 53250199Sgrehan 54250199Sgrehanstatic void vmbus_channel_set_event(hv_vmbus_channel* channel); 55294886Ssephestatic void VmbusProcessChannelEvent(void* channel, int pending); 56250199Sgrehan 57250199Sgrehan/** 58250199Sgrehan * @brief Trigger an event notification on the specified channel 59250199Sgrehan */ 60250199Sgrehanstatic void 61250199Sgrehanvmbus_channel_set_event(hv_vmbus_channel *channel) 62250199Sgrehan{ 63250199Sgrehan hv_vmbus_monitor_page *monitor_page; 64250199Sgrehan 65250199Sgrehan if (channel->offer_msg.monitor_allocated) { 66250199Sgrehan /* Each uint32_t represents 32 channels */ 67250199Sgrehan synch_set_bit((channel->offer_msg.child_rel_id & 31), 68250199Sgrehan ((uint32_t *)hv_vmbus_g_connection.send_interrupt_page 69250199Sgrehan + ((channel->offer_msg.child_rel_id >> 5)))); 70250199Sgrehan 71250199Sgrehan monitor_page = (hv_vmbus_monitor_page *) 72295309Ssephe hv_vmbus_g_connection.monitor_page_2; 73250199Sgrehan 74250199Sgrehan synch_set_bit(channel->monitor_bit, 75250199Sgrehan (uint32_t *)&monitor_page-> 76256276Sdim trigger_group[channel->monitor_group].u.pending); 77250199Sgrehan } else { 78282212Swhu hv_vmbus_set_event(channel); 79250199Sgrehan } 80250199Sgrehan 81250199Sgrehan} 82250199Sgrehan 83250199Sgrehan/** 84250199Sgrehan * @brief Open the specified channel 85250199Sgrehan */ 86250199Sgrehanint 87250199Sgrehanhv_vmbus_channel_open( 88250199Sgrehan hv_vmbus_channel* new_channel, 89250199Sgrehan uint32_t send_ring_buffer_size, 90250199Sgrehan uint32_t recv_ring_buffer_size, 91250199Sgrehan void* user_data, 92250199Sgrehan uint32_t user_data_len, 93250199Sgrehan hv_vmbus_pfn_channel_callback pfn_on_channel_callback, 94250199Sgrehan void* context) 95250199Sgrehan{ 96250199Sgrehan 97250199Sgrehan int ret = 0; 98250199Sgrehan void *in, *out; 99250199Sgrehan hv_vmbus_channel_open_channel* open_msg; 100250199Sgrehan hv_vmbus_channel_msg_info* open_info; 101250199Sgrehan 102282212Swhu mtx_lock(&new_channel->sc_lock); 103282212Swhu if (new_channel->state == HV_CHANNEL_OPEN_STATE) { 104282212Swhu new_channel->state = HV_CHANNEL_OPENING_STATE; 105282212Swhu } else { 106282212Swhu mtx_unlock(&new_channel->sc_lock); 107282212Swhu if(bootverbose) 108282212Swhu printf("VMBUS: Trying to open channel <%p> which in " 109282212Swhu "%d state.\n", new_channel, new_channel->state); 110282212Swhu return (EINVAL); 111282212Swhu } 112282212Swhu mtx_unlock(&new_channel->sc_lock); 113282212Swhu 114250199Sgrehan new_channel->on_channel_callback = pfn_on_channel_callback; 115250199Sgrehan new_channel->channel_callback_context = context; 116250199Sgrehan 117294886Ssephe new_channel->rxq = hv_vmbus_g_context.hv_event_queue[new_channel->target_cpu]; 118294886Ssephe TASK_INIT(&new_channel->channel_task, 0, VmbusProcessChannelEvent, new_channel); 119294886Ssephe 120250199Sgrehan /* Allocate the ring buffer */ 121250199Sgrehan out = contigmalloc((send_ring_buffer_size + recv_ring_buffer_size), 122256350Sgrehan M_DEVBUF, M_ZERO, 0UL, BUS_SPACE_MAXADDR, PAGE_SIZE, 0); 123250199Sgrehan KASSERT(out != NULL, 124250199Sgrehan ("Error VMBUS: contigmalloc failed to allocate Ring Buffer!")); 125250199Sgrehan if (out == NULL) 126256350Sgrehan return (ENOMEM); 127250199Sgrehan 128250199Sgrehan in = ((uint8_t *) out + send_ring_buffer_size); 129250199Sgrehan 130250199Sgrehan new_channel->ring_buffer_pages = out; 131256350Sgrehan new_channel->ring_buffer_page_count = (send_ring_buffer_size + 132256350Sgrehan recv_ring_buffer_size) >> PAGE_SHIFT; 133256350Sgrehan new_channel->ring_buffer_size = send_ring_buffer_size + 134256350Sgrehan recv_ring_buffer_size; 135250199Sgrehan 136250199Sgrehan hv_vmbus_ring_buffer_init( 137250199Sgrehan &new_channel->outbound, 138250199Sgrehan out, 139250199Sgrehan send_ring_buffer_size); 140250199Sgrehan 141250199Sgrehan hv_vmbus_ring_buffer_init( 142250199Sgrehan &new_channel->inbound, 143250199Sgrehan in, 144250199Sgrehan recv_ring_buffer_size); 145250199Sgrehan 146250199Sgrehan /** 147250199Sgrehan * Establish the gpadl for the ring buffer 148250199Sgrehan */ 149250199Sgrehan new_channel->ring_buffer_gpadl_handle = 0; 150250199Sgrehan 151250199Sgrehan ret = hv_vmbus_channel_establish_gpadl(new_channel, 152250199Sgrehan new_channel->outbound.ring_buffer, 153250199Sgrehan send_ring_buffer_size + recv_ring_buffer_size, 154250199Sgrehan &new_channel->ring_buffer_gpadl_handle); 155250199Sgrehan 156250199Sgrehan /** 157250199Sgrehan * Create and init the channel open message 158250199Sgrehan */ 159250199Sgrehan open_info = (hv_vmbus_channel_msg_info*) malloc( 160250199Sgrehan sizeof(hv_vmbus_channel_msg_info) + 161250199Sgrehan sizeof(hv_vmbus_channel_open_channel), 162250199Sgrehan M_DEVBUF, 163250199Sgrehan M_NOWAIT); 164250199Sgrehan KASSERT(open_info != NULL, 165250199Sgrehan ("Error VMBUS: malloc failed to allocate Open Channel message!")); 166250199Sgrehan 167250199Sgrehan if (open_info == NULL) 168250199Sgrehan return (ENOMEM); 169250199Sgrehan 170250199Sgrehan sema_init(&open_info->wait_sema, 0, "Open Info Sema"); 171250199Sgrehan 172250199Sgrehan open_msg = (hv_vmbus_channel_open_channel*) open_info->msg; 173250199Sgrehan open_msg->header.message_type = HV_CHANNEL_MESSAGE_OPEN_CHANNEL; 174250199Sgrehan open_msg->open_id = new_channel->offer_msg.child_rel_id; 175250199Sgrehan open_msg->child_rel_id = new_channel->offer_msg.child_rel_id; 176250199Sgrehan open_msg->ring_buffer_gpadl_handle = 177250199Sgrehan new_channel->ring_buffer_gpadl_handle; 178250199Sgrehan open_msg->downstream_ring_buffer_page_offset = send_ring_buffer_size 179250199Sgrehan >> PAGE_SHIFT; 180282212Swhu open_msg->target_vcpu = new_channel->target_vcpu; 181250199Sgrehan 182250199Sgrehan if (user_data_len) 183250199Sgrehan memcpy(open_msg->user_data, user_data, user_data_len); 184250199Sgrehan 185250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 186250199Sgrehan TAILQ_INSERT_TAIL( 187250199Sgrehan &hv_vmbus_g_connection.channel_msg_anchor, 188250199Sgrehan open_info, 189250199Sgrehan msg_list_entry); 190250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 191250199Sgrehan 192250199Sgrehan ret = hv_vmbus_post_message( 193250199Sgrehan open_msg, sizeof(hv_vmbus_channel_open_channel)); 194250199Sgrehan 195250199Sgrehan if (ret != 0) 196250199Sgrehan goto cleanup; 197250199Sgrehan 198296028Ssephe ret = sema_timedwait(&open_info->wait_sema, 5 * hz); /* KYS 5 seconds */ 199250199Sgrehan 200282212Swhu if (ret) { 201282212Swhu if(bootverbose) 202282212Swhu printf("VMBUS: channel <%p> open timeout.\n", new_channel); 203250199Sgrehan goto cleanup; 204282212Swhu } 205250199Sgrehan 206250199Sgrehan if (open_info->response.open_result.status == 0) { 207282212Swhu new_channel->state = HV_CHANNEL_OPENED_STATE; 208250199Sgrehan if(bootverbose) 209250199Sgrehan printf("VMBUS: channel <%p> open success.\n", new_channel); 210250199Sgrehan } else { 211250199Sgrehan if(bootverbose) 212250199Sgrehan printf("Error VMBUS: channel <%p> open failed - %d!\n", 213250199Sgrehan new_channel, open_info->response.open_result.status); 214250199Sgrehan } 215250199Sgrehan 216250199Sgrehan cleanup: 217250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 218250199Sgrehan TAILQ_REMOVE( 219250199Sgrehan &hv_vmbus_g_connection.channel_msg_anchor, 220250199Sgrehan open_info, 221250199Sgrehan msg_list_entry); 222250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 223250199Sgrehan sema_destroy(&open_info->wait_sema); 224250199Sgrehan free(open_info, M_DEVBUF); 225250199Sgrehan 226250199Sgrehan return (ret); 227250199Sgrehan} 228250199Sgrehan 229250199Sgrehan/** 230250199Sgrehan * @brief Create a gpadl for the specified buffer 231250199Sgrehan */ 232250199Sgrehanstatic int 233250199Sgrehanvmbus_channel_create_gpadl_header( 234250199Sgrehan void* contig_buffer, 235250199Sgrehan uint32_t size, /* page-size multiple */ 236250199Sgrehan hv_vmbus_channel_msg_info** msg_info, 237250199Sgrehan uint32_t* message_count) 238250199Sgrehan{ 239250199Sgrehan int i; 240250199Sgrehan int page_count; 241250199Sgrehan unsigned long long pfn; 242250199Sgrehan uint32_t msg_size; 243250199Sgrehan hv_vmbus_channel_gpadl_header* gpa_header; 244250199Sgrehan hv_vmbus_channel_gpadl_body* gpadl_body; 245250199Sgrehan hv_vmbus_channel_msg_info* msg_header; 246250199Sgrehan hv_vmbus_channel_msg_info* msg_body; 247250199Sgrehan 248250199Sgrehan int pfnSum, pfnCount, pfnLeft, pfnCurr, pfnSize; 249250199Sgrehan 250250199Sgrehan page_count = size >> PAGE_SHIFT; 251250199Sgrehan pfn = hv_get_phys_addr(contig_buffer) >> PAGE_SHIFT; 252250199Sgrehan 253250199Sgrehan /*do we need a gpadl body msg */ 254250199Sgrehan pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE 255250199Sgrehan - sizeof(hv_vmbus_channel_gpadl_header) 256250199Sgrehan - sizeof(hv_gpa_range); 257250199Sgrehan pfnCount = pfnSize / sizeof(uint64_t); 258250199Sgrehan 259250199Sgrehan if (page_count > pfnCount) { /* if(we need a gpadl body) */ 260250199Sgrehan /* fill in the header */ 261250199Sgrehan msg_size = sizeof(hv_vmbus_channel_msg_info) 262250199Sgrehan + sizeof(hv_vmbus_channel_gpadl_header) 263250199Sgrehan + sizeof(hv_gpa_range) 264250199Sgrehan + pfnCount * sizeof(uint64_t); 265250199Sgrehan msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); 266250199Sgrehan KASSERT( 267250199Sgrehan msg_header != NULL, 268250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl Message!")); 269250199Sgrehan if (msg_header == NULL) 270250199Sgrehan return (ENOMEM); 271250199Sgrehan 272250199Sgrehan TAILQ_INIT(&msg_header->sub_msg_list_anchor); 273250199Sgrehan msg_header->message_size = msg_size; 274250199Sgrehan 275250199Sgrehan gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg; 276250199Sgrehan gpa_header->range_count = 1; 277250199Sgrehan gpa_header->range_buf_len = sizeof(hv_gpa_range) 278250199Sgrehan + page_count * sizeof(uint64_t); 279250199Sgrehan gpa_header->range[0].byte_offset = 0; 280250199Sgrehan gpa_header->range[0].byte_count = size; 281250199Sgrehan for (i = 0; i < pfnCount; i++) { 282250199Sgrehan gpa_header->range[0].pfn_array[i] = pfn + i; 283250199Sgrehan } 284250199Sgrehan *msg_info = msg_header; 285250199Sgrehan *message_count = 1; 286250199Sgrehan 287250199Sgrehan pfnSum = pfnCount; 288250199Sgrehan pfnLeft = page_count - pfnCount; 289250199Sgrehan 290250199Sgrehan /* 291250199Sgrehan * figure out how many pfns we can fit 292250199Sgrehan */ 293250199Sgrehan pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE 294250199Sgrehan - sizeof(hv_vmbus_channel_gpadl_body); 295250199Sgrehan pfnCount = pfnSize / sizeof(uint64_t); 296250199Sgrehan 297250199Sgrehan /* 298250199Sgrehan * fill in the body 299250199Sgrehan */ 300250199Sgrehan while (pfnLeft) { 301250199Sgrehan if (pfnLeft > pfnCount) { 302250199Sgrehan pfnCurr = pfnCount; 303250199Sgrehan } else { 304250199Sgrehan pfnCurr = pfnLeft; 305250199Sgrehan } 306250199Sgrehan 307250199Sgrehan msg_size = sizeof(hv_vmbus_channel_msg_info) + 308250199Sgrehan sizeof(hv_vmbus_channel_gpadl_body) + 309250199Sgrehan pfnCurr * sizeof(uint64_t); 310250199Sgrehan msg_body = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); 311250199Sgrehan KASSERT( 312250199Sgrehan msg_body != NULL, 313250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl msg_body!")); 314250199Sgrehan if (msg_body == NULL) 315250199Sgrehan return (ENOMEM); 316250199Sgrehan 317250199Sgrehan msg_body->message_size = msg_size; 318250199Sgrehan (*message_count)++; 319250199Sgrehan gpadl_body = 320250199Sgrehan (hv_vmbus_channel_gpadl_body*) msg_body->msg; 321250199Sgrehan /* 322250199Sgrehan * gpadl_body->gpadl = kbuffer; 323250199Sgrehan */ 324250199Sgrehan for (i = 0; i < pfnCurr; i++) { 325250199Sgrehan gpadl_body->pfn[i] = pfn + pfnSum + i; 326250199Sgrehan } 327250199Sgrehan 328250199Sgrehan TAILQ_INSERT_TAIL( 329250199Sgrehan &msg_header->sub_msg_list_anchor, 330250199Sgrehan msg_body, 331250199Sgrehan msg_list_entry); 332250199Sgrehan pfnSum += pfnCurr; 333250199Sgrehan pfnLeft -= pfnCurr; 334250199Sgrehan } 335250199Sgrehan } else { /* else everything fits in a header */ 336250199Sgrehan 337250199Sgrehan msg_size = sizeof(hv_vmbus_channel_msg_info) + 338250199Sgrehan sizeof(hv_vmbus_channel_gpadl_header) + 339250199Sgrehan sizeof(hv_gpa_range) + 340250199Sgrehan page_count * sizeof(uint64_t); 341250199Sgrehan msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); 342250199Sgrehan KASSERT( 343250199Sgrehan msg_header != NULL, 344250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl Message!")); 345250199Sgrehan if (msg_header == NULL) 346250199Sgrehan return (ENOMEM); 347250199Sgrehan 348250199Sgrehan msg_header->message_size = msg_size; 349250199Sgrehan 350250199Sgrehan gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg; 351250199Sgrehan gpa_header->range_count = 1; 352250199Sgrehan gpa_header->range_buf_len = sizeof(hv_gpa_range) + 353250199Sgrehan page_count * sizeof(uint64_t); 354250199Sgrehan gpa_header->range[0].byte_offset = 0; 355250199Sgrehan gpa_header->range[0].byte_count = size; 356250199Sgrehan for (i = 0; i < page_count; i++) { 357250199Sgrehan gpa_header->range[0].pfn_array[i] = pfn + i; 358250199Sgrehan } 359250199Sgrehan 360250199Sgrehan *msg_info = msg_header; 361250199Sgrehan *message_count = 1; 362250199Sgrehan } 363250199Sgrehan 364250199Sgrehan return (0); 365250199Sgrehan} 366250199Sgrehan 367250199Sgrehan/** 368250199Sgrehan * @brief Establish a GPADL for the specified buffer 369250199Sgrehan */ 370250199Sgrehanint 371250199Sgrehanhv_vmbus_channel_establish_gpadl( 372250199Sgrehan hv_vmbus_channel* channel, 373250199Sgrehan void* contig_buffer, 374250199Sgrehan uint32_t size, /* page-size multiple */ 375250199Sgrehan uint32_t* gpadl_handle) 376250199Sgrehan 377250199Sgrehan{ 378250199Sgrehan int ret = 0; 379250199Sgrehan hv_vmbus_channel_gpadl_header* gpadl_msg; 380250199Sgrehan hv_vmbus_channel_gpadl_body* gpadl_body; 381250199Sgrehan hv_vmbus_channel_msg_info* msg_info; 382250199Sgrehan hv_vmbus_channel_msg_info* sub_msg_info; 383250199Sgrehan uint32_t msg_count; 384250199Sgrehan hv_vmbus_channel_msg_info* curr; 385250199Sgrehan uint32_t next_gpadl_handle; 386250199Sgrehan 387250199Sgrehan next_gpadl_handle = hv_vmbus_g_connection.next_gpadl_handle; 388250199Sgrehan atomic_add_int((int*) &hv_vmbus_g_connection.next_gpadl_handle, 1); 389250199Sgrehan 390250199Sgrehan ret = vmbus_channel_create_gpadl_header( 391250199Sgrehan contig_buffer, size, &msg_info, &msg_count); 392250199Sgrehan 393250199Sgrehan if(ret != 0) { /* if(allocation failed) return immediately */ 394250199Sgrehan /* reverse atomic_add_int above */ 395250199Sgrehan atomic_subtract_int((int*) 396250199Sgrehan &hv_vmbus_g_connection.next_gpadl_handle, 1); 397250199Sgrehan return ret; 398250199Sgrehan } 399250199Sgrehan 400250199Sgrehan sema_init(&msg_info->wait_sema, 0, "Open Info Sema"); 401250199Sgrehan gpadl_msg = (hv_vmbus_channel_gpadl_header*) msg_info->msg; 402250199Sgrehan gpadl_msg->header.message_type = HV_CHANNEL_MESSAGEL_GPADL_HEADER; 403250199Sgrehan gpadl_msg->child_rel_id = channel->offer_msg.child_rel_id; 404250199Sgrehan gpadl_msg->gpadl = next_gpadl_handle; 405250199Sgrehan 406250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 407250199Sgrehan TAILQ_INSERT_TAIL( 408250199Sgrehan &hv_vmbus_g_connection.channel_msg_anchor, 409250199Sgrehan msg_info, 410250199Sgrehan msg_list_entry); 411250199Sgrehan 412250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 413250199Sgrehan 414250199Sgrehan ret = hv_vmbus_post_message( 415250199Sgrehan gpadl_msg, 416250199Sgrehan msg_info->message_size - 417250199Sgrehan (uint32_t) sizeof(hv_vmbus_channel_msg_info)); 418250199Sgrehan 419250199Sgrehan if (ret != 0) 420250199Sgrehan goto cleanup; 421250199Sgrehan 422250199Sgrehan if (msg_count > 1) { 423250199Sgrehan TAILQ_FOREACH(curr, 424250199Sgrehan &msg_info->sub_msg_list_anchor, msg_list_entry) { 425250199Sgrehan sub_msg_info = curr; 426250199Sgrehan gpadl_body = 427250199Sgrehan (hv_vmbus_channel_gpadl_body*) sub_msg_info->msg; 428250199Sgrehan 429250199Sgrehan gpadl_body->header.message_type = 430250199Sgrehan HV_CHANNEL_MESSAGE_GPADL_BODY; 431250199Sgrehan gpadl_body->gpadl = next_gpadl_handle; 432250199Sgrehan 433250199Sgrehan ret = hv_vmbus_post_message( 434250199Sgrehan gpadl_body, 435250199Sgrehan sub_msg_info->message_size 436250199Sgrehan - (uint32_t) sizeof(hv_vmbus_channel_msg_info)); 437250199Sgrehan /* if (the post message failed) give up and clean up */ 438250199Sgrehan if(ret != 0) 439250199Sgrehan goto cleanup; 440250199Sgrehan } 441250199Sgrehan } 442250199Sgrehan 443296028Ssephe ret = sema_timedwait(&msg_info->wait_sema, 5 * hz); /* KYS 5 seconds*/ 444250199Sgrehan if (ret != 0) 445250199Sgrehan goto cleanup; 446250199Sgrehan 447250199Sgrehan *gpadl_handle = gpadl_msg->gpadl; 448250199Sgrehan 449250199Sgrehancleanup: 450250199Sgrehan 451250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 452250199Sgrehan TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor, 453250199Sgrehan msg_info, msg_list_entry); 454250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 455250199Sgrehan 456250199Sgrehan sema_destroy(&msg_info->wait_sema); 457250199Sgrehan free(msg_info, M_DEVBUF); 458250199Sgrehan 459250199Sgrehan return (ret); 460250199Sgrehan} 461250199Sgrehan 462250199Sgrehan/** 463250199Sgrehan * @brief Teardown the specified GPADL handle 464250199Sgrehan */ 465250199Sgrehanint 466250199Sgrehanhv_vmbus_channel_teardown_gpdal( 467250199Sgrehan hv_vmbus_channel* channel, 468250199Sgrehan uint32_t gpadl_handle) 469250199Sgrehan{ 470250199Sgrehan int ret = 0; 471250199Sgrehan hv_vmbus_channel_gpadl_teardown* msg; 472250199Sgrehan hv_vmbus_channel_msg_info* info; 473250199Sgrehan 474250199Sgrehan info = (hv_vmbus_channel_msg_info *) 475250199Sgrehan malloc( sizeof(hv_vmbus_channel_msg_info) + 476250199Sgrehan sizeof(hv_vmbus_channel_gpadl_teardown), 477250199Sgrehan M_DEVBUF, M_NOWAIT); 478250199Sgrehan KASSERT(info != NULL, 479250199Sgrehan ("Error VMBUS: malloc failed to allocate Gpadl Teardown Msg!")); 480250199Sgrehan if (info == NULL) { 481250199Sgrehan ret = ENOMEM; 482250199Sgrehan goto cleanup; 483250199Sgrehan } 484250199Sgrehan 485250199Sgrehan sema_init(&info->wait_sema, 0, "Open Info Sema"); 486250199Sgrehan 487250199Sgrehan msg = (hv_vmbus_channel_gpadl_teardown*) info->msg; 488250199Sgrehan 489250199Sgrehan msg->header.message_type = HV_CHANNEL_MESSAGE_GPADL_TEARDOWN; 490250199Sgrehan msg->child_rel_id = channel->offer_msg.child_rel_id; 491250199Sgrehan msg->gpadl = gpadl_handle; 492250199Sgrehan 493250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 494250199Sgrehan TAILQ_INSERT_TAIL(&hv_vmbus_g_connection.channel_msg_anchor, 495250199Sgrehan info, msg_list_entry); 496250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 497250199Sgrehan 498250199Sgrehan ret = hv_vmbus_post_message(msg, 499250199Sgrehan sizeof(hv_vmbus_channel_gpadl_teardown)); 500250199Sgrehan if (ret != 0) 501250199Sgrehan goto cleanup; 502250199Sgrehan 503296028Ssephe ret = sema_timedwait(&info->wait_sema, 5 * hz); /* KYS 5 seconds */ 504250199Sgrehan 505250199Sgrehancleanup: 506250199Sgrehan /* 507250199Sgrehan * Received a torndown response 508250199Sgrehan */ 509250199Sgrehan mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); 510250199Sgrehan TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor, 511250199Sgrehan info, msg_list_entry); 512250199Sgrehan mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); 513250199Sgrehan sema_destroy(&info->wait_sema); 514250199Sgrehan free(info, M_DEVBUF); 515250199Sgrehan 516250199Sgrehan return (ret); 517250199Sgrehan} 518250199Sgrehan 519282212Swhustatic void 520282212Swhuhv_vmbus_channel_close_internal(hv_vmbus_channel *channel) 521250199Sgrehan{ 522250199Sgrehan int ret = 0; 523294886Ssephe struct taskqueue *rxq = channel->rxq; 524250199Sgrehan hv_vmbus_channel_close_channel* msg; 525250199Sgrehan hv_vmbus_channel_msg_info* info; 526250199Sgrehan 527282212Swhu channel->state = HV_CHANNEL_OPEN_STATE; 528282212Swhu channel->sc_creation_callback = NULL; 529282212Swhu 530282212Swhu /* 531294886Ssephe * set rxq to NULL to avoid more requests be scheduled 532294886Ssephe */ 533294886Ssephe channel->rxq = NULL; 534294886Ssephe taskqueue_drain(rxq, &channel->channel_task); 535294886Ssephe /* 536282212Swhu * Grab the lock to prevent race condition when a packet received 537282212Swhu * and unloading driver is in the process. 538282212Swhu */ 539250199Sgrehan mtx_lock(&channel->inbound_lock); 540250199Sgrehan channel->on_channel_callback = NULL; 541250199Sgrehan mtx_unlock(&channel->inbound_lock); 542250199Sgrehan 543250199Sgrehan /** 544250199Sgrehan * Send a closing message 545250199Sgrehan */ 546250199Sgrehan info = (hv_vmbus_channel_msg_info *) 547250199Sgrehan malloc( sizeof(hv_vmbus_channel_msg_info) + 548250199Sgrehan sizeof(hv_vmbus_channel_close_channel), 549250199Sgrehan M_DEVBUF, M_NOWAIT); 550250199Sgrehan KASSERT(info != NULL, ("VMBUS: malloc failed hv_vmbus_channel_close!")); 551250199Sgrehan if(info == NULL) 552250199Sgrehan return; 553250199Sgrehan 554250199Sgrehan msg = (hv_vmbus_channel_close_channel*) info->msg; 555250199Sgrehan msg->header.message_type = HV_CHANNEL_MESSAGE_CLOSE_CHANNEL; 556250199Sgrehan msg->child_rel_id = channel->offer_msg.child_rel_id; 557250199Sgrehan 558250199Sgrehan ret = hv_vmbus_post_message( 559250199Sgrehan msg, sizeof(hv_vmbus_channel_close_channel)); 560250199Sgrehan 561250199Sgrehan /* Tear down the gpadl for the channel's ring buffer */ 562250199Sgrehan if (channel->ring_buffer_gpadl_handle) { 563250199Sgrehan hv_vmbus_channel_teardown_gpdal(channel, 564250199Sgrehan channel->ring_buffer_gpadl_handle); 565250199Sgrehan } 566250199Sgrehan 567250199Sgrehan /* TODO: Send a msg to release the childRelId */ 568250199Sgrehan 569250199Sgrehan /* cleanup the ring buffers for this channel */ 570250199Sgrehan hv_ring_buffer_cleanup(&channel->outbound); 571250199Sgrehan hv_ring_buffer_cleanup(&channel->inbound); 572250199Sgrehan 573256350Sgrehan contigfree(channel->ring_buffer_pages, channel->ring_buffer_size, 574256350Sgrehan M_DEVBUF); 575250199Sgrehan 576250199Sgrehan free(info, M_DEVBUF); 577282212Swhu} 578250199Sgrehan 579282212Swhu/** 580282212Swhu * @brief Close the specified channel 581282212Swhu */ 582282212Swhuvoid 583282212Swhuhv_vmbus_channel_close(hv_vmbus_channel *channel) 584282212Swhu{ 585282212Swhu hv_vmbus_channel* sub_channel; 586282212Swhu 587282212Swhu if (channel->primary_channel != NULL) { 588282212Swhu /* 589282212Swhu * We only close multi-channels when the primary is 590282212Swhu * closed. 591282212Swhu */ 592282212Swhu return; 593282212Swhu } 594282212Swhu 595250199Sgrehan /* 596282212Swhu * Close all multi-channels first. 597250199Sgrehan */ 598282212Swhu TAILQ_FOREACH(sub_channel, &channel->sc_list_anchor, 599282212Swhu sc_list_entry) { 600282212Swhu if (sub_channel->state != HV_CHANNEL_OPENED_STATE) 601282212Swhu continue; 602282212Swhu hv_vmbus_channel_close_internal(sub_channel); 603250199Sgrehan } 604282212Swhu /* 605282212Swhu * Then close the primary channel. 606282212Swhu */ 607282212Swhu hv_vmbus_channel_close_internal(channel); 608250199Sgrehan} 609250199Sgrehan 610250199Sgrehan/** 611250199Sgrehan * @brief Send the specified buffer on the given channel 612250199Sgrehan */ 613250199Sgrehanint 614250199Sgrehanhv_vmbus_channel_send_packet( 615250199Sgrehan hv_vmbus_channel* channel, 616250199Sgrehan void* buffer, 617250199Sgrehan uint32_t buffer_len, 618250199Sgrehan uint64_t request_id, 619250199Sgrehan hv_vmbus_packet_type type, 620250199Sgrehan uint32_t flags) 621250199Sgrehan{ 622250199Sgrehan int ret = 0; 623250199Sgrehan hv_vm_packet_descriptor desc; 624250199Sgrehan uint32_t packet_len; 625250199Sgrehan uint64_t aligned_data; 626250199Sgrehan uint32_t packet_len_aligned; 627282212Swhu boolean_t need_sig; 628250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 629250199Sgrehan 630250199Sgrehan packet_len = sizeof(hv_vm_packet_descriptor) + buffer_len; 631250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 632250199Sgrehan aligned_data = 0; 633250199Sgrehan 634250199Sgrehan /* Setup the descriptor */ 635250199Sgrehan desc.type = type; /* HV_VMBUS_PACKET_TYPE_DATA_IN_BAND; */ 636250199Sgrehan desc.flags = flags; /* HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED */ 637250199Sgrehan /* in 8-bytes granularity */ 638250199Sgrehan desc.data_offset8 = sizeof(hv_vm_packet_descriptor) >> 3; 639250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 640250199Sgrehan desc.transaction_id = request_id; 641250199Sgrehan 642250199Sgrehan buffer_list[0].data = &desc; 643250199Sgrehan buffer_list[0].length = sizeof(hv_vm_packet_descriptor); 644250199Sgrehan 645250199Sgrehan buffer_list[1].data = buffer; 646250199Sgrehan buffer_list[1].length = buffer_len; 647250199Sgrehan 648250199Sgrehan buffer_list[2].data = &aligned_data; 649250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 650250199Sgrehan 651282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 652282212Swhu &need_sig); 653250199Sgrehan 654250199Sgrehan /* TODO: We should determine if this is optional */ 655282212Swhu if (ret == 0 && need_sig) { 656250199Sgrehan vmbus_channel_set_event(channel); 657250199Sgrehan } 658250199Sgrehan 659250199Sgrehan return (ret); 660250199Sgrehan} 661250199Sgrehan 662250199Sgrehan/** 663250199Sgrehan * @brief Send a range of single-page buffer packets using 664250199Sgrehan * a GPADL Direct packet type 665250199Sgrehan */ 666250199Sgrehanint 667250199Sgrehanhv_vmbus_channel_send_packet_pagebuffer( 668250199Sgrehan hv_vmbus_channel* channel, 669250199Sgrehan hv_vmbus_page_buffer page_buffers[], 670250199Sgrehan uint32_t page_count, 671250199Sgrehan void* buffer, 672250199Sgrehan uint32_t buffer_len, 673250199Sgrehan uint64_t request_id) 674250199Sgrehan{ 675250199Sgrehan 676250199Sgrehan int ret = 0; 677282212Swhu boolean_t need_sig; 678250199Sgrehan uint32_t packet_len; 679294705Ssephe uint32_t page_buflen; 680250199Sgrehan uint32_t packetLen_aligned; 681294705Ssephe hv_vmbus_sg_buffer_list buffer_list[4]; 682250199Sgrehan hv_vmbus_channel_packet_page_buffer desc; 683250199Sgrehan uint32_t descSize; 684250199Sgrehan uint64_t alignedData = 0; 685250199Sgrehan 686250199Sgrehan if (page_count > HV_MAX_PAGE_BUFFER_COUNT) 687250199Sgrehan return (EINVAL); 688250199Sgrehan 689250199Sgrehan /* 690250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_page_buffer 691250199Sgrehan * is the largest size we support 692250199Sgrehan */ 693294705Ssephe descSize = __offsetof(hv_vmbus_channel_packet_page_buffer, range); 694294705Ssephe page_buflen = sizeof(hv_vmbus_page_buffer) * page_count; 695294705Ssephe packet_len = descSize + page_buflen + buffer_len; 696250199Sgrehan packetLen_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 697250199Sgrehan 698250199Sgrehan /* Setup the descriptor */ 699250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 700250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 701294705Ssephe /* in 8-bytes granularity */ 702294705Ssephe desc.data_offset8 = (descSize + page_buflen) >> 3; 703250199Sgrehan desc.length8 = (uint16_t) (packetLen_aligned >> 3); 704250199Sgrehan desc.transaction_id = request_id; 705250199Sgrehan desc.range_count = page_count; 706250199Sgrehan 707250199Sgrehan buffer_list[0].data = &desc; 708250199Sgrehan buffer_list[0].length = descSize; 709250199Sgrehan 710294705Ssephe buffer_list[1].data = page_buffers; 711294705Ssephe buffer_list[1].length = page_buflen; 712250199Sgrehan 713294705Ssephe buffer_list[2].data = buffer; 714294705Ssephe buffer_list[2].length = buffer_len; 715250199Sgrehan 716294705Ssephe buffer_list[3].data = &alignedData; 717294705Ssephe buffer_list[3].length = packetLen_aligned - packet_len; 718294705Ssephe 719294705Ssephe ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 4, 720282212Swhu &need_sig); 721250199Sgrehan 722250199Sgrehan /* TODO: We should determine if this is optional */ 723282212Swhu if (ret == 0 && need_sig) { 724250199Sgrehan vmbus_channel_set_event(channel); 725250199Sgrehan } 726250199Sgrehan 727250199Sgrehan return (ret); 728250199Sgrehan} 729250199Sgrehan 730250199Sgrehan/** 731250199Sgrehan * @brief Send a multi-page buffer packet using a GPADL Direct packet type 732250199Sgrehan */ 733250199Sgrehanint 734250199Sgrehanhv_vmbus_channel_send_packet_multipagebuffer( 735250199Sgrehan hv_vmbus_channel* channel, 736250199Sgrehan hv_vmbus_multipage_buffer* multi_page_buffer, 737250199Sgrehan void* buffer, 738250199Sgrehan uint32_t buffer_len, 739250199Sgrehan uint64_t request_id) 740250199Sgrehan{ 741250199Sgrehan 742250199Sgrehan int ret = 0; 743250199Sgrehan uint32_t desc_size; 744282212Swhu boolean_t need_sig; 745250199Sgrehan uint32_t packet_len; 746250199Sgrehan uint32_t packet_len_aligned; 747250199Sgrehan uint32_t pfn_count; 748250199Sgrehan uint64_t aligned_data = 0; 749250199Sgrehan hv_vmbus_sg_buffer_list buffer_list[3]; 750250199Sgrehan hv_vmbus_channel_packet_multipage_buffer desc; 751250199Sgrehan 752250199Sgrehan pfn_count = 753250199Sgrehan HV_NUM_PAGES_SPANNED( 754250199Sgrehan multi_page_buffer->offset, 755250199Sgrehan multi_page_buffer->length); 756250199Sgrehan 757250199Sgrehan if ((pfn_count == 0) || (pfn_count > HV_MAX_MULTIPAGE_BUFFER_COUNT)) 758250199Sgrehan return (EINVAL); 759250199Sgrehan /* 760250199Sgrehan * Adjust the size down since hv_vmbus_channel_packet_multipage_buffer 761250199Sgrehan * is the largest size we support 762250199Sgrehan */ 763250199Sgrehan desc_size = 764250199Sgrehan sizeof(hv_vmbus_channel_packet_multipage_buffer) - 765250199Sgrehan ((HV_MAX_MULTIPAGE_BUFFER_COUNT - pfn_count) * 766250199Sgrehan sizeof(uint64_t)); 767250199Sgrehan packet_len = desc_size + buffer_len; 768250199Sgrehan packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); 769250199Sgrehan 770250199Sgrehan /* 771250199Sgrehan * Setup the descriptor 772250199Sgrehan */ 773250199Sgrehan desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; 774250199Sgrehan desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 775250199Sgrehan desc.data_offset8 = desc_size >> 3; /* in 8-bytes granularity */ 776250199Sgrehan desc.length8 = (uint16_t) (packet_len_aligned >> 3); 777250199Sgrehan desc.transaction_id = request_id; 778250199Sgrehan desc.range_count = 1; 779250199Sgrehan 780250199Sgrehan desc.range.length = multi_page_buffer->length; 781250199Sgrehan desc.range.offset = multi_page_buffer->offset; 782250199Sgrehan 783250199Sgrehan memcpy(desc.range.pfn_array, multi_page_buffer->pfn_array, 784250199Sgrehan pfn_count * sizeof(uint64_t)); 785250199Sgrehan 786250199Sgrehan buffer_list[0].data = &desc; 787250199Sgrehan buffer_list[0].length = desc_size; 788250199Sgrehan 789250199Sgrehan buffer_list[1].data = buffer; 790250199Sgrehan buffer_list[1].length = buffer_len; 791250199Sgrehan 792250199Sgrehan buffer_list[2].data = &aligned_data; 793250199Sgrehan buffer_list[2].length = packet_len_aligned - packet_len; 794250199Sgrehan 795282212Swhu ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, 796282212Swhu &need_sig); 797250199Sgrehan 798250199Sgrehan /* TODO: We should determine if this is optional */ 799282212Swhu if (ret == 0 && need_sig) { 800250199Sgrehan vmbus_channel_set_event(channel); 801250199Sgrehan } 802250199Sgrehan 803250199Sgrehan return (ret); 804250199Sgrehan} 805250199Sgrehan 806250199Sgrehan/** 807250199Sgrehan * @brief Retrieve the user packet on the specified channel 808250199Sgrehan */ 809250199Sgrehanint 810250199Sgrehanhv_vmbus_channel_recv_packet( 811250199Sgrehan hv_vmbus_channel* channel, 812250199Sgrehan void* Buffer, 813250199Sgrehan uint32_t buffer_len, 814250199Sgrehan uint32_t* buffer_actual_len, 815250199Sgrehan uint64_t* request_id) 816250199Sgrehan{ 817250199Sgrehan int ret; 818250199Sgrehan uint32_t user_len; 819250199Sgrehan uint32_t packet_len; 820250199Sgrehan hv_vm_packet_descriptor desc; 821250199Sgrehan 822250199Sgrehan *buffer_actual_len = 0; 823250199Sgrehan *request_id = 0; 824250199Sgrehan 825250199Sgrehan ret = hv_ring_buffer_peek(&channel->inbound, &desc, 826250199Sgrehan sizeof(hv_vm_packet_descriptor)); 827250199Sgrehan if (ret != 0) 828250199Sgrehan return (0); 829250199Sgrehan 830250199Sgrehan packet_len = desc.length8 << 3; 831250199Sgrehan user_len = packet_len - (desc.data_offset8 << 3); 832250199Sgrehan 833250199Sgrehan *buffer_actual_len = user_len; 834250199Sgrehan 835250199Sgrehan if (user_len > buffer_len) 836250199Sgrehan return (EINVAL); 837250199Sgrehan 838250199Sgrehan *request_id = desc.transaction_id; 839250199Sgrehan 840250199Sgrehan /* Copy over the packet to the user buffer */ 841250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, Buffer, user_len, 842250199Sgrehan (desc.data_offset8 << 3)); 843250199Sgrehan 844250199Sgrehan return (0); 845250199Sgrehan} 846250199Sgrehan 847250199Sgrehan/** 848250199Sgrehan * @brief Retrieve the raw packet on the specified channel 849250199Sgrehan */ 850250199Sgrehanint 851250199Sgrehanhv_vmbus_channel_recv_packet_raw( 852250199Sgrehan hv_vmbus_channel* channel, 853250199Sgrehan void* buffer, 854250199Sgrehan uint32_t buffer_len, 855250199Sgrehan uint32_t* buffer_actual_len, 856250199Sgrehan uint64_t* request_id) 857250199Sgrehan{ 858250199Sgrehan int ret; 859250199Sgrehan uint32_t packetLen; 860250199Sgrehan uint32_t userLen; 861250199Sgrehan hv_vm_packet_descriptor desc; 862250199Sgrehan 863250199Sgrehan *buffer_actual_len = 0; 864250199Sgrehan *request_id = 0; 865250199Sgrehan 866250199Sgrehan ret = hv_ring_buffer_peek( 867250199Sgrehan &channel->inbound, &desc, 868250199Sgrehan sizeof(hv_vm_packet_descriptor)); 869250199Sgrehan 870250199Sgrehan if (ret != 0) 871250199Sgrehan return (0); 872250199Sgrehan 873250199Sgrehan packetLen = desc.length8 << 3; 874250199Sgrehan userLen = packetLen - (desc.data_offset8 << 3); 875250199Sgrehan 876250199Sgrehan *buffer_actual_len = packetLen; 877250199Sgrehan 878250199Sgrehan if (packetLen > buffer_len) 879250199Sgrehan return (ENOBUFS); 880250199Sgrehan 881250199Sgrehan *request_id = desc.transaction_id; 882250199Sgrehan 883250199Sgrehan /* Copy over the entire packet to the user buffer */ 884250199Sgrehan ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0); 885250199Sgrehan 886250199Sgrehan return (0); 887250199Sgrehan} 888294886Ssephe 889294886Ssephe 890294886Ssephe/** 891294886Ssephe * Process a channel event notification 892294886Ssephe */ 893294886Ssephestatic void 894294886SsepheVmbusProcessChannelEvent(void* context, int pending) 895294886Ssephe{ 896294886Ssephe void* arg; 897294886Ssephe uint32_t bytes_to_read; 898294886Ssephe hv_vmbus_channel* channel = (hv_vmbus_channel*)context; 899294886Ssephe boolean_t is_batched_reading; 900294886Ssephe 901294886Ssephe /** 902294886Ssephe * Find the channel based on this relid and invokes 903294886Ssephe * the channel callback to process the event 904294886Ssephe */ 905294886Ssephe 906294886Ssephe if (channel == NULL) { 907294886Ssephe return; 908294886Ssephe } 909294886Ssephe /** 910294886Ssephe * To deal with the race condition where we might 911294886Ssephe * receive a packet while the relevant driver is 912294886Ssephe * being unloaded, dispatch the callback while 913294886Ssephe * holding the channel lock. The unloading driver 914294886Ssephe * will acquire the same channel lock to set the 915294886Ssephe * callback to NULL. This closes the window. 916294886Ssephe */ 917294886Ssephe 918294886Ssephe /* 919294886Ssephe * Disable the lock due to newly added WITNESS check in r277723. 920294886Ssephe * Will seek other way to avoid race condition. 921294886Ssephe * -- whu 922294886Ssephe */ 923294886Ssephe // mtx_lock(&channel->inbound_lock); 924294886Ssephe if (channel->on_channel_callback != NULL) { 925294886Ssephe arg = channel->channel_callback_context; 926294886Ssephe is_batched_reading = channel->batched_reading; 927294886Ssephe /* 928294886Ssephe * Optimize host to guest signaling by ensuring: 929294886Ssephe * 1. While reading the channel, we disable interrupts from 930294886Ssephe * host. 931294886Ssephe * 2. Ensure that we process all posted messages from the host 932294886Ssephe * before returning from this callback. 933294886Ssephe * 3. Once we return, enable signaling from the host. Once this 934294886Ssephe * state is set we check to see if additional packets are 935294886Ssephe * available to read. In this case we repeat the process. 936294886Ssephe */ 937294886Ssephe do { 938294886Ssephe if (is_batched_reading) 939294886Ssephe hv_ring_buffer_read_begin(&channel->inbound); 940294886Ssephe 941294886Ssephe channel->on_channel_callback(arg); 942294886Ssephe 943294886Ssephe if (is_batched_reading) 944294886Ssephe bytes_to_read = 945294886Ssephe hv_ring_buffer_read_end(&channel->inbound); 946294886Ssephe else 947294886Ssephe bytes_to_read = 0; 948294886Ssephe } while (is_batched_reading && (bytes_to_read != 0)); 949294886Ssephe } 950294886Ssephe // mtx_unlock(&channel->inbound_lock); 951294886Ssephe} 952