| 1 | /* |
| 2 | * Copyright (c) 2009, Microsoft Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 15 | * Place - Suite 330, Boston, MA 02111-1307 USA. |
| 16 | * |
| 17 | * Authors: |
| 18 | * Haiyang Zhang <haiyangz@microsoft.com> |
| 19 | * Hank Janssen <hjanssen@microsoft.com> |
| 20 | */ |
| 21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 22 | |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/wait.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/hyperv.h> |
| 30 | |
| 31 | #include "hyperv_vmbus.h" |
| 32 | |
| 33 | #define NUM_PAGES_SPANNED(addr, len) \ |
| 34 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) |
| 35 | |
| 36 | /* Internal routines */ |
| 37 | static int create_gpadl_header( |
| 38 | void *kbuffer, /* must be phys and virt contiguous */ |
| 39 | u32 size, /* page-size multiple */ |
| 40 | struct vmbus_channel_msginfo **msginfo, |
| 41 | u32 *messagecount); |
| 42 | static void vmbus_setevent(struct vmbus_channel *channel); |
| 43 | |
| 44 | /* |
| 45 | * vmbus_setevent- Trigger an event notification on the specified |
| 46 | * channel. |
| 47 | */ |
| 48 | static void vmbus_setevent(struct vmbus_channel *channel) |
| 49 | { |
| 50 | struct hv_monitor_page *monitorpage; |
| 51 | |
| 52 | if (channel->offermsg.monitor_allocated) { |
| 53 | /* Each u32 represents 32 channels */ |
| 54 | sync_set_bit(channel->offermsg.child_relid & 31, |
| 55 | (unsigned long *) vmbus_connection.send_int_page + |
| 56 | (channel->offermsg.child_relid >> 5)); |
| 57 | |
| 58 | monitorpage = vmbus_connection.monitor_pages; |
| 59 | monitorpage++; /* Get the child to parent monitor page */ |
| 60 | |
| 61 | sync_set_bit(channel->monitor_bit, |
| 62 | (unsigned long *)&monitorpage->trigger_group |
| 63 | [channel->monitor_grp].pending); |
| 64 | |
| 65 | } else { |
| 66 | vmbus_set_event(channel->offermsg.child_relid); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * vmbus_get_debug_info -Retrieve various channel debug info |
| 72 | */ |
| 73 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
| 74 | struct vmbus_channel_debug_info *debuginfo) |
| 75 | { |
| 76 | struct hv_monitor_page *monitorpage; |
| 77 | u8 monitor_group = (u8)channel->offermsg.monitorid / 32; |
| 78 | u8 monitor_offset = (u8)channel->offermsg.monitorid % 32; |
| 79 | |
| 80 | debuginfo->relid = channel->offermsg.child_relid; |
| 81 | debuginfo->state = channel->state; |
| 82 | memcpy(&debuginfo->interfacetype, |
| 83 | &channel->offermsg.offer.if_type, sizeof(uuid_le)); |
| 84 | memcpy(&debuginfo->interface_instance, |
| 85 | &channel->offermsg.offer.if_instance, |
| 86 | sizeof(uuid_le)); |
| 87 | |
| 88 | monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages; |
| 89 | |
| 90 | debuginfo->monitorid = channel->offermsg.monitorid; |
| 91 | |
| 92 | debuginfo->servermonitor_pending = |
| 93 | monitorpage->trigger_group[monitor_group].pending; |
| 94 | debuginfo->servermonitor_latency = |
| 95 | monitorpage->latency[monitor_group][monitor_offset]; |
| 96 | debuginfo->servermonitor_connectionid = |
| 97 | monitorpage->parameter[monitor_group] |
| 98 | [monitor_offset].connectionid.u.id; |
| 99 | |
| 100 | monitorpage++; |
| 101 | |
| 102 | debuginfo->clientmonitor_pending = |
| 103 | monitorpage->trigger_group[monitor_group].pending; |
| 104 | debuginfo->clientmonitor_latency = |
| 105 | monitorpage->latency[monitor_group][monitor_offset]; |
| 106 | debuginfo->clientmonitor_connectionid = |
| 107 | monitorpage->parameter[monitor_group] |
| 108 | [monitor_offset].connectionid.u.id; |
| 109 | |
| 110 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
| 111 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * vmbus_open - Open the specified channel. |
| 116 | */ |
| 117 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
| 118 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
| 119 | void (*onchannelcallback)(void *context), void *context) |
| 120 | { |
| 121 | struct vmbus_channel_open_channel *open_msg; |
| 122 | struct vmbus_channel_msginfo *open_info = NULL; |
| 123 | void *in, *out; |
| 124 | unsigned long flags; |
| 125 | int ret, t, err = 0; |
| 126 | |
| 127 | newchannel->onchannel_callback = onchannelcallback; |
| 128 | newchannel->channel_callback_context = context; |
| 129 | |
| 130 | /* Allocate the ring buffer */ |
| 131 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
| 132 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); |
| 133 | |
| 134 | if (!out) |
| 135 | return -ENOMEM; |
| 136 | |
| 137 | |
| 138 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
| 139 | |
| 140 | newchannel->ringbuffer_pages = out; |
| 141 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + |
| 142 | recv_ringbuffer_size) >> PAGE_SHIFT; |
| 143 | |
| 144 | ret = hv_ringbuffer_init( |
| 145 | &newchannel->outbound, out, send_ringbuffer_size); |
| 146 | |
| 147 | if (ret != 0) { |
| 148 | err = ret; |
| 149 | goto errorout; |
| 150 | } |
| 151 | |
| 152 | ret = hv_ringbuffer_init( |
| 153 | &newchannel->inbound, in, recv_ringbuffer_size); |
| 154 | if (ret != 0) { |
| 155 | err = ret; |
| 156 | goto errorout; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | /* Establish the gpadl for the ring buffer */ |
| 161 | newchannel->ringbuffer_gpadlhandle = 0; |
| 162 | |
| 163 | ret = vmbus_establish_gpadl(newchannel, |
| 164 | newchannel->outbound.ring_buffer, |
| 165 | send_ringbuffer_size + |
| 166 | recv_ringbuffer_size, |
| 167 | &newchannel->ringbuffer_gpadlhandle); |
| 168 | |
| 169 | if (ret != 0) { |
| 170 | err = ret; |
| 171 | goto errorout; |
| 172 | } |
| 173 | |
| 174 | /* Create and init the channel open message */ |
| 175 | open_info = kmalloc(sizeof(*open_info) + |
| 176 | sizeof(struct vmbus_channel_open_channel), |
| 177 | GFP_KERNEL); |
| 178 | if (!open_info) { |
| 179 | err = -ENOMEM; |
| 180 | goto errorout; |
| 181 | } |
| 182 | |
| 183 | init_completion(&open_info->waitevent); |
| 184 | |
| 185 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
| 186 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
| 187 | open_msg->openid = newchannel->offermsg.child_relid; |
| 188 | open_msg->child_relid = newchannel->offermsg.child_relid; |
| 189 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; |
| 190 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> |
| 191 | PAGE_SHIFT; |
| 192 | open_msg->server_contextarea_gpadlhandle = 0; |
| 193 | |
| 194 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
| 195 | err = -EINVAL; |
| 196 | goto errorout; |
| 197 | } |
| 198 | |
| 199 | if (userdatalen) |
| 200 | memcpy(open_msg->userdata, userdata, userdatalen); |
| 201 | |
| 202 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| 203 | list_add_tail(&open_info->msglistentry, |
| 204 | &vmbus_connection.chn_msg_list); |
| 205 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| 206 | |
| 207 | ret = vmbus_post_msg(open_msg, |
| 208 | sizeof(struct vmbus_channel_open_channel)); |
| 209 | |
| 210 | if (ret != 0) |
| 211 | goto cleanup; |
| 212 | |
| 213 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
| 214 | if (t == 0) { |
| 215 | err = -ETIMEDOUT; |
| 216 | goto errorout; |
| 217 | } |
| 218 | |
| 219 | |
| 220 | if (open_info->response.open_result.status) |
| 221 | err = open_info->response.open_result.status; |
| 222 | |
| 223 | cleanup: |
| 224 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| 225 | list_del(&open_info->msglistentry); |
| 226 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| 227 | |
| 228 | kfree(open_info); |
| 229 | return err; |
| 230 | |
| 231 | errorout: |
| 232 | hv_ringbuffer_cleanup(&newchannel->outbound); |
| 233 | hv_ringbuffer_cleanup(&newchannel->inbound); |
| 234 | free_pages((unsigned long)out, |
| 235 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); |
| 236 | kfree(open_info); |
| 237 | return err; |
| 238 | } |
| 239 | EXPORT_SYMBOL_GPL(vmbus_open); |
| 240 | |
| 241 | /* |
| 242 | * create_gpadl_header - Creates a gpadl for the specified buffer |
| 243 | */ |
| 244 | static int create_gpadl_header(void *kbuffer, u32 size, |
| 245 | struct vmbus_channel_msginfo **msginfo, |
| 246 | u32 *messagecount) |
| 247 | { |
| 248 | int i; |
| 249 | int pagecount; |
| 250 | unsigned long long pfn; |
| 251 | struct vmbus_channel_gpadl_header *gpadl_header; |
| 252 | struct vmbus_channel_gpadl_body *gpadl_body; |
| 253 | struct vmbus_channel_msginfo *msgheader; |
| 254 | struct vmbus_channel_msginfo *msgbody = NULL; |
| 255 | u32 msgsize; |
| 256 | |
| 257 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
| 258 | |
| 259 | pagecount = size >> PAGE_SHIFT; |
| 260 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; |
| 261 | |
| 262 | /* do we need a gpadl body msg */ |
| 263 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
| 264 | sizeof(struct vmbus_channel_gpadl_header) - |
| 265 | sizeof(struct gpa_range); |
| 266 | pfncount = pfnsize / sizeof(u64); |
| 267 | |
| 268 | if (pagecount > pfncount) { |
| 269 | /* we need a gpadl body */ |
| 270 | /* fill in the header */ |
| 271 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
| 272 | sizeof(struct vmbus_channel_gpadl_header) + |
| 273 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
| 274 | msgheader = kzalloc(msgsize, GFP_KERNEL); |
| 275 | if (!msgheader) |
| 276 | goto nomem; |
| 277 | |
| 278 | INIT_LIST_HEAD(&msgheader->submsglist); |
| 279 | msgheader->msgsize = msgsize; |
| 280 | |
| 281 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
| 282 | msgheader->msg; |
| 283 | gpadl_header->rangecount = 1; |
| 284 | gpadl_header->range_buflen = sizeof(struct gpa_range) + |
| 285 | pagecount * sizeof(u64); |
| 286 | gpadl_header->range[0].byte_offset = 0; |
| 287 | gpadl_header->range[0].byte_count = size; |
| 288 | for (i = 0; i < pfncount; i++) |
| 289 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
| 290 | *msginfo = msgheader; |
| 291 | *messagecount = 1; |
| 292 | |
| 293 | pfnsum = pfncount; |
| 294 | pfnleft = pagecount - pfncount; |
| 295 | |
| 296 | /* how many pfns can we fit */ |
| 297 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
| 298 | sizeof(struct vmbus_channel_gpadl_body); |
| 299 | pfncount = pfnsize / sizeof(u64); |
| 300 | |
| 301 | /* fill in the body */ |
| 302 | while (pfnleft) { |
| 303 | if (pfnleft > pfncount) |
| 304 | pfncurr = pfncount; |
| 305 | else |
| 306 | pfncurr = pfnleft; |
| 307 | |
| 308 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
| 309 | sizeof(struct vmbus_channel_gpadl_body) + |
| 310 | pfncurr * sizeof(u64); |
| 311 | msgbody = kzalloc(msgsize, GFP_KERNEL); |
| 312 | |
| 313 | if (!msgbody) { |
| 314 | struct vmbus_channel_msginfo *pos = NULL; |
| 315 | struct vmbus_channel_msginfo *tmp = NULL; |
| 316 | /* |
| 317 | * Free up all the allocated messages. |
| 318 | */ |
| 319 | list_for_each_entry_safe(pos, tmp, |
| 320 | &msgheader->submsglist, |
| 321 | msglistentry) { |
| 322 | |
| 323 | list_del(&pos->msglistentry); |
| 324 | kfree(pos); |
| 325 | } |
| 326 | |
| 327 | goto nomem; |
| 328 | } |
| 329 | |
| 330 | msgbody->msgsize = msgsize; |
| 331 | (*messagecount)++; |
| 332 | gpadl_body = |
| 333 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
| 334 | |
| 335 | /* |
| 336 | * Gpadl is u32 and we are using a pointer which could |
| 337 | * be 64-bit |
| 338 | * This is governed by the guest/host protocol and |
| 339 | * so the hypervisor gurantees that this is ok. |
| 340 | */ |
| 341 | for (i = 0; i < pfncurr; i++) |
| 342 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
| 343 | |
| 344 | /* add to msg header */ |
| 345 | list_add_tail(&msgbody->msglistentry, |
| 346 | &msgheader->submsglist); |
| 347 | pfnsum += pfncurr; |
| 348 | pfnleft -= pfncurr; |
| 349 | } |
| 350 | } else { |
| 351 | /* everything fits in a header */ |
| 352 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
| 353 | sizeof(struct vmbus_channel_gpadl_header) + |
| 354 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
| 355 | msgheader = kzalloc(msgsize, GFP_KERNEL); |
| 356 | if (msgheader == NULL) |
| 357 | goto nomem; |
| 358 | msgheader->msgsize = msgsize; |
| 359 | |
| 360 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
| 361 | msgheader->msg; |
| 362 | gpadl_header->rangecount = 1; |
| 363 | gpadl_header->range_buflen = sizeof(struct gpa_range) + |
| 364 | pagecount * sizeof(u64); |
| 365 | gpadl_header->range[0].byte_offset = 0; |
| 366 | gpadl_header->range[0].byte_count = size; |
| 367 | for (i = 0; i < pagecount; i++) |
| 368 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
| 369 | |
| 370 | *msginfo = msgheader; |
| 371 | *messagecount = 1; |
| 372 | } |
| 373 | |
| 374 | return 0; |
| 375 | nomem: |
| 376 | kfree(msgheader); |
| 377 | kfree(msgbody); |
| 378 | return -ENOMEM; |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
| 383 | * |
| 384 | * @channel: a channel |
| 385 | * @kbuffer: from kmalloc |
| 386 | * @size: page-size multiple |
| 387 | * @gpadl_handle: some funky thing |
| 388 | */ |
| 389 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
| 390 | u32 size, u32 *gpadl_handle) |
| 391 | { |
| 392 | struct vmbus_channel_gpadl_header *gpadlmsg; |
| 393 | struct vmbus_channel_gpadl_body *gpadl_body; |
| 394 | struct vmbus_channel_msginfo *msginfo = NULL; |
| 395 | struct vmbus_channel_msginfo *submsginfo; |
| 396 | u32 msgcount; |
| 397 | struct list_head *curr; |
| 398 | u32 next_gpadl_handle; |
| 399 | unsigned long flags; |
| 400 | int ret = 0; |
| 401 | int t; |
| 402 | |
| 403 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
| 404 | atomic_inc(&vmbus_connection.next_gpadl_handle); |
| 405 | |
| 406 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
| 407 | if (ret) |
| 408 | return ret; |
| 409 | |
| 410 | init_completion(&msginfo->waitevent); |
| 411 | |
| 412 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
| 413 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; |
| 414 | gpadlmsg->child_relid = channel->offermsg.child_relid; |
| 415 | gpadlmsg->gpadl = next_gpadl_handle; |
| 416 | |
| 417 | |
| 418 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| 419 | list_add_tail(&msginfo->msglistentry, |
| 420 | &vmbus_connection.chn_msg_list); |
| 421 | |
| 422 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| 423 | |
| 424 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
| 425 | sizeof(*msginfo)); |
| 426 | if (ret != 0) |
| 427 | goto cleanup; |
| 428 | |
| 429 | if (msgcount > 1) { |
| 430 | list_for_each(curr, &msginfo->submsglist) { |
| 431 | |
| 432 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
| 433 | gpadl_body = |
| 434 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
| 435 | |
| 436 | gpadl_body->header.msgtype = |
| 437 | CHANNELMSG_GPADL_BODY; |
| 438 | gpadl_body->gpadl = next_gpadl_handle; |
| 439 | |
| 440 | ret = vmbus_post_msg(gpadl_body, |
| 441 | submsginfo->msgsize - |
| 442 | sizeof(*submsginfo)); |
| 443 | if (ret != 0) |
| 444 | goto cleanup; |
| 445 | |
| 446 | } |
| 447 | } |
| 448 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
| 449 | BUG_ON(t == 0); |
| 450 | |
| 451 | |
| 452 | /* At this point, we received the gpadl created msg */ |
| 453 | *gpadl_handle = gpadlmsg->gpadl; |
| 454 | |
| 455 | cleanup: |
| 456 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| 457 | list_del(&msginfo->msglistentry); |
| 458 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| 459 | |
| 460 | kfree(msginfo); |
| 461 | return ret; |
| 462 | } |
| 463 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
| 464 | |
| 465 | /* |
| 466 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
| 467 | */ |
| 468 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
| 469 | { |
| 470 | struct vmbus_channel_gpadl_teardown *msg; |
| 471 | struct vmbus_channel_msginfo *info; |
| 472 | unsigned long flags; |
| 473 | int ret, t; |
| 474 | |
| 475 | info = kmalloc(sizeof(*info) + |
| 476 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); |
| 477 | if (!info) |
| 478 | return -ENOMEM; |
| 479 | |
| 480 | init_completion(&info->waitevent); |
| 481 | |
| 482 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
| 483 | |
| 484 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
| 485 | msg->child_relid = channel->offermsg.child_relid; |
| 486 | msg->gpadl = gpadl_handle; |
| 487 | |
| 488 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| 489 | list_add_tail(&info->msglistentry, |
| 490 | &vmbus_connection.chn_msg_list); |
| 491 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| 492 | ret = vmbus_post_msg(msg, |
| 493 | sizeof(struct vmbus_channel_gpadl_teardown)); |
| 494 | |
| 495 | BUG_ON(ret != 0); |
| 496 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
| 497 | BUG_ON(t == 0); |
| 498 | |
| 499 | /* Received a torndown response */ |
| 500 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| 501 | list_del(&info->msglistentry); |
| 502 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| 503 | |
| 504 | kfree(info); |
| 505 | return ret; |
| 506 | } |
| 507 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
| 508 | |
| 509 | /* |
| 510 | * vmbus_close - Close the specified channel |
| 511 | */ |
| 512 | void vmbus_close(struct vmbus_channel *channel) |
| 513 | { |
| 514 | struct vmbus_channel_close_channel *msg; |
| 515 | int ret; |
| 516 | unsigned long flags; |
| 517 | |
| 518 | /* Stop callback and cancel the timer asap */ |
| 519 | spin_lock_irqsave(&channel->inbound_lock, flags); |
| 520 | channel->onchannel_callback = NULL; |
| 521 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
| 522 | |
| 523 | /* Send a closing message */ |
| 524 | |
| 525 | msg = &channel->close_msg.msg; |
| 526 | |
| 527 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
| 528 | msg->child_relid = channel->offermsg.child_relid; |
| 529 | |
| 530 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
| 531 | |
| 532 | BUG_ON(ret != 0); |
| 533 | /* Tear down the gpadl for the channel's ring buffer */ |
| 534 | if (channel->ringbuffer_gpadlhandle) |
| 535 | vmbus_teardown_gpadl(channel, |
| 536 | channel->ringbuffer_gpadlhandle); |
| 537 | |
| 538 | /* Cleanup the ring buffers for this channel */ |
| 539 | hv_ringbuffer_cleanup(&channel->outbound); |
| 540 | hv_ringbuffer_cleanup(&channel->inbound); |
| 541 | |
| 542 | free_pages((unsigned long)channel->ringbuffer_pages, |
| 543 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); |
| 544 | |
| 545 | |
| 546 | } |
| 547 | EXPORT_SYMBOL_GPL(vmbus_close); |
| 548 | |
| 549 | /** |
| 550 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
| 551 | * @channel: Pointer to vmbus_channel structure. |
| 552 | * @buffer: Pointer to the buffer you want to receive the data into. |
| 553 | * @bufferlen: Maximum size of what the the buffer will hold |
| 554 | * @requestid: Identifier of the request |
| 555 | * @type: Type of packet that is being send e.g. negotiate, time |
| 556 | * packet etc. |
| 557 | * |
| 558 | * Sends data in @buffer directly to hyper-v via the vmbus |
| 559 | * This will send the data unparsed to hyper-v. |
| 560 | * |
| 561 | * Mainly used by Hyper-V drivers. |
| 562 | */ |
| 563 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
| 564 | u32 bufferlen, u64 requestid, |
| 565 | enum vmbus_packet_type type, u32 flags) |
| 566 | { |
| 567 | struct vmpacket_descriptor desc; |
| 568 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
| 569 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
| 570 | struct scatterlist bufferlist[3]; |
| 571 | u64 aligned_data = 0; |
| 572 | int ret; |
| 573 | |
| 574 | |
| 575 | /* Setup the descriptor */ |
| 576 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
| 577 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ |
| 578 | /* in 8-bytes granularity */ |
| 579 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
| 580 | desc.len8 = (u16)(packetlen_aligned >> 3); |
| 581 | desc.trans_id = requestid; |
| 582 | |
| 583 | sg_init_table(bufferlist, 3); |
| 584 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); |
| 585 | sg_set_buf(&bufferlist[1], buffer, bufferlen); |
| 586 | sg_set_buf(&bufferlist[2], &aligned_data, |
| 587 | packetlen_aligned - packetlen); |
| 588 | |
| 589 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
| 590 | |
| 591 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
| 592 | vmbus_setevent(channel); |
| 593 | |
| 594 | return ret; |
| 595 | } |
| 596 | EXPORT_SYMBOL(vmbus_sendpacket); |
| 597 | |
| 598 | /* |
| 599 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
| 600 | * packets using a GPADL Direct packet type. |
| 601 | */ |
| 602 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
| 603 | struct hv_page_buffer pagebuffers[], |
| 604 | u32 pagecount, void *buffer, u32 bufferlen, |
| 605 | u64 requestid) |
| 606 | { |
| 607 | int ret; |
| 608 | int i; |
| 609 | struct vmbus_channel_packet_page_buffer desc; |
| 610 | u32 descsize; |
| 611 | u32 packetlen; |
| 612 | u32 packetlen_aligned; |
| 613 | struct scatterlist bufferlist[3]; |
| 614 | u64 aligned_data = 0; |
| 615 | |
| 616 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
| 617 | return -EINVAL; |
| 618 | |
| 619 | |
| 620 | /* |
| 621 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
| 622 | * largest size we support |
| 623 | */ |
| 624 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
| 625 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * |
| 626 | sizeof(struct hv_page_buffer)); |
| 627 | packetlen = descsize + bufferlen; |
| 628 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
| 629 | |
| 630 | /* Setup the descriptor */ |
| 631 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
| 632 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
| 633 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
| 634 | desc.length8 = (u16)(packetlen_aligned >> 3); |
| 635 | desc.transactionid = requestid; |
| 636 | desc.rangecount = pagecount; |
| 637 | |
| 638 | for (i = 0; i < pagecount; i++) { |
| 639 | desc.range[i].len = pagebuffers[i].len; |
| 640 | desc.range[i].offset = pagebuffers[i].offset; |
| 641 | desc.range[i].pfn = pagebuffers[i].pfn; |
| 642 | } |
| 643 | |
| 644 | sg_init_table(bufferlist, 3); |
| 645 | sg_set_buf(&bufferlist[0], &desc, descsize); |
| 646 | sg_set_buf(&bufferlist[1], buffer, bufferlen); |
| 647 | sg_set_buf(&bufferlist[2], &aligned_data, |
| 648 | packetlen_aligned - packetlen); |
| 649 | |
| 650 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
| 651 | |
| 652 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
| 653 | vmbus_setevent(channel); |
| 654 | |
| 655 | return ret; |
| 656 | } |
| 657 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
| 658 | |
| 659 | /* |
| 660 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
| 661 | * using a GPADL Direct packet type. |
| 662 | */ |
| 663 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
| 664 | struct hv_multipage_buffer *multi_pagebuffer, |
| 665 | void *buffer, u32 bufferlen, u64 requestid) |
| 666 | { |
| 667 | int ret; |
| 668 | struct vmbus_channel_packet_multipage_buffer desc; |
| 669 | u32 descsize; |
| 670 | u32 packetlen; |
| 671 | u32 packetlen_aligned; |
| 672 | struct scatterlist bufferlist[3]; |
| 673 | u64 aligned_data = 0; |
| 674 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
| 675 | multi_pagebuffer->len); |
| 676 | |
| 677 | |
| 678 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
| 679 | return -EINVAL; |
| 680 | |
| 681 | /* |
| 682 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
| 683 | * the largest size we support |
| 684 | */ |
| 685 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
| 686 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * |
| 687 | sizeof(u64)); |
| 688 | packetlen = descsize + bufferlen; |
| 689 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
| 690 | |
| 691 | |
| 692 | /* Setup the descriptor */ |
| 693 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
| 694 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
| 695 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
| 696 | desc.length8 = (u16)(packetlen_aligned >> 3); |
| 697 | desc.transactionid = requestid; |
| 698 | desc.rangecount = 1; |
| 699 | |
| 700 | desc.range.len = multi_pagebuffer->len; |
| 701 | desc.range.offset = multi_pagebuffer->offset; |
| 702 | |
| 703 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
| 704 | pfncount * sizeof(u64)); |
| 705 | |
| 706 | sg_init_table(bufferlist, 3); |
| 707 | sg_set_buf(&bufferlist[0], &desc, descsize); |
| 708 | sg_set_buf(&bufferlist[1], buffer, bufferlen); |
| 709 | sg_set_buf(&bufferlist[2], &aligned_data, |
| 710 | packetlen_aligned - packetlen); |
| 711 | |
| 712 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
| 713 | |
| 714 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
| 715 | vmbus_setevent(channel); |
| 716 | |
| 717 | return ret; |
| 718 | } |
| 719 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
| 720 | |
| 721 | /** |
| 722 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
| 723 | * @channel: Pointer to vmbus_channel structure. |
| 724 | * @buffer: Pointer to the buffer you want to receive the data into. |
| 725 | * @bufferlen: Maximum size of what the the buffer will hold |
| 726 | * @buffer_actual_len: The actual size of the data after it was received |
| 727 | * @requestid: Identifier of the request |
| 728 | * |
| 729 | * Receives directly from the hyper-v vmbus and puts the data it received |
| 730 | * into Buffer. This will receive the data unparsed from hyper-v. |
| 731 | * |
| 732 | * Mainly used by Hyper-V drivers. |
| 733 | */ |
| 734 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
| 735 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
| 736 | { |
| 737 | struct vmpacket_descriptor desc; |
| 738 | u32 packetlen; |
| 739 | u32 userlen; |
| 740 | int ret; |
| 741 | |
| 742 | *buffer_actual_len = 0; |
| 743 | *requestid = 0; |
| 744 | |
| 745 | |
| 746 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
| 747 | sizeof(struct vmpacket_descriptor)); |
| 748 | if (ret != 0) |
| 749 | return 0; |
| 750 | |
| 751 | packetlen = desc.len8 << 3; |
| 752 | userlen = packetlen - (desc.offset8 << 3); |
| 753 | |
| 754 | *buffer_actual_len = userlen; |
| 755 | |
| 756 | if (userlen > bufferlen) { |
| 757 | |
| 758 | pr_err("Buffer too small - got %d needs %d\n", |
| 759 | bufferlen, userlen); |
| 760 | return -ETOOSMALL; |
| 761 | } |
| 762 | |
| 763 | *requestid = desc.trans_id; |
| 764 | |
| 765 | /* Copy over the packet to the user buffer */ |
| 766 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
| 767 | (desc.offset8 << 3)); |
| 768 | |
| 769 | |
| 770 | return 0; |
| 771 | } |
| 772 | EXPORT_SYMBOL(vmbus_recvpacket); |
| 773 | |
| 774 | /* |
| 775 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
| 776 | */ |
| 777 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
| 778 | u32 bufferlen, u32 *buffer_actual_len, |
| 779 | u64 *requestid) |
| 780 | { |
| 781 | struct vmpacket_descriptor desc; |
| 782 | u32 packetlen; |
| 783 | u32 userlen; |
| 784 | int ret; |
| 785 | |
| 786 | *buffer_actual_len = 0; |
| 787 | *requestid = 0; |
| 788 | |
| 789 | |
| 790 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
| 791 | sizeof(struct vmpacket_descriptor)); |
| 792 | if (ret != 0) |
| 793 | return 0; |
| 794 | |
| 795 | |
| 796 | packetlen = desc.len8 << 3; |
| 797 | userlen = packetlen - (desc.offset8 << 3); |
| 798 | |
| 799 | *buffer_actual_len = packetlen; |
| 800 | |
| 801 | if (packetlen > bufferlen) { |
| 802 | pr_err("Buffer too small - needed %d bytes but " |
| 803 | "got space for only %d bytes\n", |
| 804 | packetlen, bufferlen); |
| 805 | return -ENOBUFS; |
| 806 | } |
| 807 | |
| 808 | *requestid = desc.trans_id; |
| 809 | |
| 810 | /* Copy over the entire packet to the user buffer */ |
| 811 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0); |
| 812 | |
| 813 | return 0; |
| 814 | } |
| 815 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |