| | 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 | /* |
| | 37 | * vmbus_setevent- Trigger an event notification on the specified |
| | 38 | * channel. |
| | 39 | */ |
| | 40 | static void vmbus_setevent(struct vmbus_channel *channel) |
| | 41 | { |
| | 42 | struct hv_monitor_page *monitorpage; |
| | 43 | |
| | 44 | if (channel->offermsg.monitor_allocated) { |
| | 45 | /* Each u32 represents 32 channels */ |
| | 46 | sync_set_bit(channel->offermsg.child_relid & 31, |
| | 47 | (unsigned long *) vmbus_connection.send_int_page + |
| | 48 | (channel->offermsg.child_relid >> 5)); |
| | 49 | |
| | 50 | monitorpage = vmbus_connection.monitor_pages; |
| | 51 | monitorpage++; /* Get the child to parent monitor page */ |
| | 52 | |
| | 53 | sync_set_bit(channel->monitor_bit, |
| | 54 | (unsigned long *)&monitorpage->trigger_group |
| | 55 | [channel->monitor_grp].pending); |
| | 56 | |
| | 57 | } else { |
| | 58 | vmbus_set_event(channel); |
| | 59 | } |
| | 60 | } |
| | 61 | |
| | 62 | /* |
| | 63 | * vmbus_get_debug_info -Retrieve various channel debug info |
| | 64 | */ |
| | 65 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
| | 66 | struct vmbus_channel_debug_info *debuginfo) |
| | 67 | { |
| | 68 | struct hv_monitor_page *monitorpage; |
| | 69 | u8 monitor_group = (u8)channel->offermsg.monitorid / 32; |
| | 70 | u8 monitor_offset = (u8)channel->offermsg.monitorid % 32; |
| | 71 | |
| | 72 | debuginfo->relid = channel->offermsg.child_relid; |
| | 73 | debuginfo->state = channel->state; |
| | 74 | memcpy(&debuginfo->interfacetype, |
| | 75 | &channel->offermsg.offer.if_type, sizeof(uuid_le)); |
| | 76 | memcpy(&debuginfo->interface_instance, |
| | 77 | &channel->offermsg.offer.if_instance, |
| | 78 | sizeof(uuid_le)); |
| | 79 | |
| | 80 | monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages; |
| | 81 | |
| | 82 | debuginfo->monitorid = channel->offermsg.monitorid; |
| | 83 | |
| | 84 | debuginfo->servermonitor_pending = |
| | 85 | monitorpage->trigger_group[monitor_group].pending; |
| | 86 | debuginfo->servermonitor_latency = |
| | 87 | monitorpage->latency[monitor_group][monitor_offset]; |
| | 88 | debuginfo->servermonitor_connectionid = |
| | 89 | monitorpage->parameter[monitor_group] |
| | 90 | [monitor_offset].connectionid.u.id; |
| | 91 | |
| | 92 | monitorpage++; |
| | 93 | |
| | 94 | debuginfo->clientmonitor_pending = |
| | 95 | monitorpage->trigger_group[monitor_group].pending; |
| | 96 | debuginfo->clientmonitor_latency = |
| | 97 | monitorpage->latency[monitor_group][monitor_offset]; |
| | 98 | debuginfo->clientmonitor_connectionid = |
| | 99 | monitorpage->parameter[monitor_group] |
| | 100 | [monitor_offset].connectionid.u.id; |
| | 101 | |
| | 102 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
| | 103 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); |
| | 104 | } |
| | 105 | |
| | 106 | /* |
| | 107 | * vmbus_open - Open the specified channel. |
| | 108 | */ |
| | 109 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
| | 110 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
| | 111 | void (*onchannelcallback)(void *context), void *context) |
| | 112 | { |
| | 113 | struct vmbus_channel_open_channel *open_msg; |
| | 114 | struct vmbus_channel_msginfo *open_info = NULL; |
| | 115 | void *in, *out; |
| | 116 | unsigned long flags; |
| | 117 | int ret, t, err = 0; |
| | 118 | |
| | 119 | newchannel->onchannel_callback = onchannelcallback; |
| | 120 | newchannel->channel_callback_context = context; |
| | 121 | |
| | 122 | /* Allocate the ring buffer */ |
| | 123 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
| | 124 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); |
| | 125 | |
| | 126 | if (!out) |
| | 127 | return -ENOMEM; |
| | 128 | |
| | 129 | |
| | 130 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
| | 131 | |
| | 132 | newchannel->ringbuffer_pages = out; |
| | 133 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + |
| | 134 | recv_ringbuffer_size) >> PAGE_SHIFT; |
| | 135 | |
| | 136 | ret = hv_ringbuffer_init( |
| | 137 | &newchannel->outbound, out, send_ringbuffer_size); |
| | 138 | |
| | 139 | if (ret != 0) { |
| | 140 | err = ret; |
| | 141 | goto error0; |
| | 142 | } |
| | 143 | |
| | 144 | ret = hv_ringbuffer_init( |
| | 145 | &newchannel->inbound, in, recv_ringbuffer_size); |
| | 146 | if (ret != 0) { |
| | 147 | err = ret; |
| | 148 | goto error0; |
| | 149 | } |
| | 150 | |
| | 151 | |
| | 152 | /* Establish the gpadl for the ring buffer */ |
| | 153 | newchannel->ringbuffer_gpadlhandle = 0; |
| | 154 | |
| | 155 | ret = vmbus_establish_gpadl(newchannel, |
| | 156 | newchannel->outbound.ring_buffer, |
| | 157 | send_ringbuffer_size + |
| | 158 | recv_ringbuffer_size, |
| | 159 | &newchannel->ringbuffer_gpadlhandle); |
| | 160 | |
| | 161 | if (ret != 0) { |
| | 162 | err = ret; |
| | 163 | goto error0; |
| | 164 | } |
| | 165 | |
| | 166 | /* Create and init the channel open message */ |
| | 167 | open_info = kmalloc(sizeof(*open_info) + |
| | 168 | sizeof(struct vmbus_channel_open_channel), |
| | 169 | GFP_KERNEL); |
| | 170 | if (!open_info) { |
| | 171 | err = -ENOMEM; |
| | 172 | goto error0; |
| | 173 | } |
| | 174 | |
| | 175 | init_completion(&open_info->waitevent); |
| | 176 | |
| | 177 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
| | 178 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
| | 179 | open_msg->openid = newchannel->offermsg.child_relid; |
| | 180 | open_msg->child_relid = newchannel->offermsg.child_relid; |
| | 181 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; |
| | 182 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> |
| | 183 | PAGE_SHIFT; |
| | 184 | open_msg->target_vp = newchannel->target_vp; |
| | 185 | |
| | 186 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
| | 187 | err = -EINVAL; |
| | 188 | goto error0; |
| | 189 | } |
| | 190 | |
| | 191 | if (userdatalen) |
| | 192 | memcpy(open_msg->userdata, userdata, userdatalen); |
| | 193 | |
| | 194 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| | 195 | list_add_tail(&open_info->msglistentry, |
| | 196 | &vmbus_connection.chn_msg_list); |
| | 197 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| | 198 | |
| | 199 | ret = vmbus_post_msg(open_msg, |
| | 200 | sizeof(struct vmbus_channel_open_channel)); |
| | 201 | |
| | 202 | if (ret != 0) |
| | 203 | goto error1; |
| | 204 | |
| | 205 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
| | 206 | if (t == 0) { |
| | 207 | err = -ETIMEDOUT; |
| | 208 | goto error1; |
| | 209 | } |
| | 210 | |
| | 211 | |
| | 212 | if (open_info->response.open_result.status) |
| | 213 | err = open_info->response.open_result.status; |
| | 214 | |
| | 215 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| | 216 | list_del(&open_info->msglistentry); |
| | 217 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| | 218 | |
| | 219 | kfree(open_info); |
| | 220 | return err; |
| | 221 | |
| | 222 | error1: |
| | 223 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| | 224 | list_del(&open_info->msglistentry); |
| | 225 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| | 226 | |
| | 227 | error0: |
| | 228 | free_pages((unsigned long)out, |
| | 229 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); |
| | 230 | kfree(open_info); |
| | 231 | return err; |
| | 232 | } |
| | 233 | EXPORT_SYMBOL_GPL(vmbus_open); |
| | 234 | |
| | 235 | /* |
| | 236 | * create_gpadl_header - Creates a gpadl for the specified buffer |
| | 237 | */ |
| | 238 | static int create_gpadl_header(void *kbuffer, u32 size, |
| | 239 | struct vmbus_channel_msginfo **msginfo, |
| | 240 | u32 *messagecount) |
| | 241 | { |
| | 242 | int i; |
| | 243 | int pagecount; |
| | 244 | unsigned long long pfn; |
| | 245 | struct vmbus_channel_gpadl_header *gpadl_header; |
| | 246 | struct vmbus_channel_gpadl_body *gpadl_body; |
| | 247 | struct vmbus_channel_msginfo *msgheader; |
| | 248 | struct vmbus_channel_msginfo *msgbody = NULL; |
| | 249 | u32 msgsize; |
| | 250 | |
| | 251 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
| | 252 | |
| | 253 | pagecount = size >> PAGE_SHIFT; |
| | 254 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; |
| | 255 | |
| | 256 | /* do we need a gpadl body msg */ |
| | 257 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
| | 258 | sizeof(struct vmbus_channel_gpadl_header) - |
| | 259 | sizeof(struct gpa_range); |
| | 260 | pfncount = pfnsize / sizeof(u64); |
| | 261 | |
| | 262 | if (pagecount > pfncount) { |
| | 263 | /* we need a gpadl body */ |
| | 264 | /* fill in the header */ |
| | 265 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
| | 266 | sizeof(struct vmbus_channel_gpadl_header) + |
| | 267 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
| | 268 | msgheader = kzalloc(msgsize, GFP_KERNEL); |
| | 269 | if (!msgheader) |
| | 270 | goto nomem; |
| | 271 | |
| | 272 | INIT_LIST_HEAD(&msgheader->submsglist); |
| | 273 | msgheader->msgsize = msgsize; |
| | 274 | |
| | 275 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
| | 276 | msgheader->msg; |
| | 277 | gpadl_header->rangecount = 1; |
| | 278 | gpadl_header->range_buflen = sizeof(struct gpa_range) + |
| | 279 | pagecount * sizeof(u64); |
| | 280 | gpadl_header->range[0].byte_offset = 0; |
| | 281 | gpadl_header->range[0].byte_count = size; |
| | 282 | for (i = 0; i < pfncount; i++) |
| | 283 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
| | 284 | *msginfo = msgheader; |
| | 285 | *messagecount = 1; |
| | 286 | |
| | 287 | pfnsum = pfncount; |
| | 288 | pfnleft = pagecount - pfncount; |
| | 289 | |
| | 290 | /* how many pfns can we fit */ |
| | 291 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
| | 292 | sizeof(struct vmbus_channel_gpadl_body); |
| | 293 | pfncount = pfnsize / sizeof(u64); |
| | 294 | |
| | 295 | /* fill in the body */ |
| | 296 | while (pfnleft) { |
| | 297 | if (pfnleft > pfncount) |
| | 298 | pfncurr = pfncount; |
| | 299 | else |
| | 300 | pfncurr = pfnleft; |
| | 301 | |
| | 302 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
| | 303 | sizeof(struct vmbus_channel_gpadl_body) + |
| | 304 | pfncurr * sizeof(u64); |
| | 305 | msgbody = kzalloc(msgsize, GFP_KERNEL); |
| | 306 | |
| | 307 | if (!msgbody) { |
| | 308 | struct vmbus_channel_msginfo *pos = NULL; |
| | 309 | struct vmbus_channel_msginfo *tmp = NULL; |
| | 310 | /* |
| | 311 | * Free up all the allocated messages. |
| | 312 | */ |
| | 313 | list_for_each_entry_safe(pos, tmp, |
| | 314 | &msgheader->submsglist, |
| | 315 | msglistentry) { |
| | 316 | |
| | 317 | list_del(&pos->msglistentry); |
| | 318 | kfree(pos); |
| | 319 | } |
| | 320 | |
| | 321 | goto nomem; |
| | 322 | } |
| | 323 | |
| | 324 | msgbody->msgsize = msgsize; |
| | 325 | (*messagecount)++; |
| | 326 | gpadl_body = |
| | 327 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
| | 328 | |
| | 329 | /* |
| | 330 | * Gpadl is u32 and we are using a pointer which could |
| | 331 | * be 64-bit |
| | 332 | * This is governed by the guest/host protocol and |
| | 333 | * so the hypervisor gurantees that this is ok. |
| | 334 | */ |
| | 335 | for (i = 0; i < pfncurr; i++) |
| | 336 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
| | 337 | |
| | 338 | /* add to msg header */ |
| | 339 | list_add_tail(&msgbody->msglistentry, |
| | 340 | &msgheader->submsglist); |
| | 341 | pfnsum += pfncurr; |
| | 342 | pfnleft -= pfncurr; |
| | 343 | } |
| | 344 | } else { |
| | 345 | /* everything fits in a header */ |
| | 346 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
| | 347 | sizeof(struct vmbus_channel_gpadl_header) + |
| | 348 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
| | 349 | msgheader = kzalloc(msgsize, GFP_KERNEL); |
| | 350 | if (msgheader == NULL) |
| | 351 | goto nomem; |
| | 352 | msgheader->msgsize = msgsize; |
| | 353 | |
| | 354 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
| | 355 | msgheader->msg; |
| | 356 | gpadl_header->rangecount = 1; |
| | 357 | gpadl_header->range_buflen = sizeof(struct gpa_range) + |
| | 358 | pagecount * sizeof(u64); |
| | 359 | gpadl_header->range[0].byte_offset = 0; |
| | 360 | gpadl_header->range[0].byte_count = size; |
| | 361 | for (i = 0; i < pagecount; i++) |
| | 362 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
| | 363 | |
| | 364 | *msginfo = msgheader; |
| | 365 | *messagecount = 1; |
| | 366 | } |
| | 367 | |
| | 368 | return 0; |
| | 369 | nomem: |
| | 370 | kfree(msgheader); |
| | 371 | kfree(msgbody); |
| | 372 | return -ENOMEM; |
| | 373 | } |
| | 374 | |
| | 375 | /* |
| | 376 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
| | 377 | * |
| | 378 | * @channel: a channel |
| | 379 | * @kbuffer: from kmalloc |
| | 380 | * @size: page-size multiple |
| | 381 | * @gpadl_handle: some funky thing |
| | 382 | */ |
| | 383 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
| | 384 | u32 size, u32 *gpadl_handle) |
| | 385 | { |
| | 386 | struct vmbus_channel_gpadl_header *gpadlmsg; |
| | 387 | struct vmbus_channel_gpadl_body *gpadl_body; |
| | 388 | struct vmbus_channel_msginfo *msginfo = NULL; |
| | 389 | struct vmbus_channel_msginfo *submsginfo; |
| | 390 | u32 msgcount; |
| | 391 | struct list_head *curr; |
| | 392 | u32 next_gpadl_handle; |
| | 393 | unsigned long flags; |
| | 394 | int ret = 0; |
| | 395 | int t; |
| | 396 | |
| | 397 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
| | 398 | atomic_inc(&vmbus_connection.next_gpadl_handle); |
| | 399 | |
| | 400 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
| | 401 | if (ret) |
| | 402 | return ret; |
| | 403 | |
| | 404 | init_completion(&msginfo->waitevent); |
| | 405 | |
| | 406 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
| | 407 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; |
| | 408 | gpadlmsg->child_relid = channel->offermsg.child_relid; |
| | 409 | gpadlmsg->gpadl = next_gpadl_handle; |
| | 410 | |
| | 411 | |
| | 412 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| | 413 | list_add_tail(&msginfo->msglistentry, |
| | 414 | &vmbus_connection.chn_msg_list); |
| | 415 | |
| | 416 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| | 417 | |
| | 418 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
| | 419 | sizeof(*msginfo)); |
| | 420 | if (ret != 0) |
| | 421 | goto cleanup; |
| | 422 | |
| | 423 | if (msgcount > 1) { |
| | 424 | list_for_each(curr, &msginfo->submsglist) { |
| | 425 | |
| | 426 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
| | 427 | gpadl_body = |
| | 428 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
| | 429 | |
| | 430 | gpadl_body->header.msgtype = |
| | 431 | CHANNELMSG_GPADL_BODY; |
| | 432 | gpadl_body->gpadl = next_gpadl_handle; |
| | 433 | |
| | 434 | ret = vmbus_post_msg(gpadl_body, |
| | 435 | submsginfo->msgsize - |
| | 436 | sizeof(*submsginfo)); |
| | 437 | if (ret != 0) |
| | 438 | goto cleanup; |
| | 439 | |
| | 440 | } |
| | 441 | } |
| | 442 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
| | 443 | BUG_ON(t == 0); |
| | 444 | |
| | 445 | |
| | 446 | /* At this point, we received the gpadl created msg */ |
| | 447 | *gpadl_handle = gpadlmsg->gpadl; |
| | 448 | |
| | 449 | cleanup: |
| | 450 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| | 451 | list_del(&msginfo->msglistentry); |
| | 452 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| | 453 | |
| | 454 | kfree(msginfo); |
| | 455 | return ret; |
| | 456 | } |
| | 457 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
| | 458 | |
| | 459 | /* |
| | 460 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
| | 461 | */ |
| | 462 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
| | 463 | { |
| | 464 | struct vmbus_channel_gpadl_teardown *msg; |
| | 465 | struct vmbus_channel_msginfo *info; |
| | 466 | unsigned long flags; |
| | 467 | int ret, t; |
| | 468 | |
| | 469 | info = kmalloc(sizeof(*info) + |
| | 470 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); |
| | 471 | if (!info) |
| | 472 | return -ENOMEM; |
| | 473 | |
| | 474 | init_completion(&info->waitevent); |
| | 475 | |
| | 476 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
| | 477 | |
| | 478 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
| | 479 | msg->child_relid = channel->offermsg.child_relid; |
| | 480 | msg->gpadl = gpadl_handle; |
| | 481 | |
| | 482 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| | 483 | list_add_tail(&info->msglistentry, |
| | 484 | &vmbus_connection.chn_msg_list); |
| | 485 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| | 486 | ret = vmbus_post_msg(msg, |
| | 487 | sizeof(struct vmbus_channel_gpadl_teardown)); |
| | 488 | |
| | 489 | BUG_ON(ret != 0); |
| | 490 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
| | 491 | BUG_ON(t == 0); |
| | 492 | |
| | 493 | /* Received a torndown response */ |
| | 494 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| | 495 | list_del(&info->msglistentry); |
| | 496 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| | 497 | |
| | 498 | kfree(info); |
| | 499 | return ret; |
| | 500 | } |
| | 501 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
| | 502 | |
| | 503 | /* |
| | 504 | * vmbus_close - Close the specified channel |
| | 505 | */ |
| | 506 | void vmbus_close(struct vmbus_channel *channel) |
| | 507 | { |
| | 508 | struct vmbus_channel_close_channel *msg; |
| | 509 | int ret; |
| | 510 | unsigned long flags; |
| | 511 | |
| | 512 | /* Stop callback and cancel the timer asap */ |
| | 513 | spin_lock_irqsave(&channel->inbound_lock, flags); |
| | 514 | channel->onchannel_callback = NULL; |
| | 515 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
| | 516 | |
| | 517 | /* Send a closing message */ |
| | 518 | |
| | 519 | msg = &channel->close_msg.msg; |
| | 520 | |
| | 521 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
| | 522 | msg->child_relid = channel->offermsg.child_relid; |
| | 523 | |
| | 524 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
| | 525 | |
| | 526 | BUG_ON(ret != 0); |
| | 527 | /* Tear down the gpadl for the channel's ring buffer */ |
| | 528 | if (channel->ringbuffer_gpadlhandle) |
| | 529 | vmbus_teardown_gpadl(channel, |
| | 530 | channel->ringbuffer_gpadlhandle); |
| | 531 | |
| | 532 | /* Cleanup the ring buffers for this channel */ |
| | 533 | hv_ringbuffer_cleanup(&channel->outbound); |
| | 534 | hv_ringbuffer_cleanup(&channel->inbound); |
| | 535 | |
| | 536 | free_pages((unsigned long)channel->ringbuffer_pages, |
| | 537 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); |
| | 538 | |
| | 539 | |
| | 540 | } |
| | 541 | EXPORT_SYMBOL_GPL(vmbus_close); |
| | 542 | |
| | 543 | /** |
| | 544 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
| | 545 | * @channel: Pointer to vmbus_channel structure. |
| | 546 | * @buffer: Pointer to the buffer you want to receive the data into. |
| | 547 | * @bufferlen: Maximum size of what the the buffer will hold |
| | 548 | * @requestid: Identifier of the request |
| | 549 | * @type: Type of packet that is being send e.g. negotiate, time |
| | 550 | * packet etc. |
| | 551 | * |
| | 552 | * Sends data in @buffer directly to hyper-v via the vmbus |
| | 553 | * This will send the data unparsed to hyper-v. |
| | 554 | * |
| | 555 | * Mainly used by Hyper-V drivers. |
| | 556 | */ |
| | 557 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
| | 558 | u32 bufferlen, u64 requestid, |
| | 559 | enum vmbus_packet_type type, u32 flags) |
| | 560 | { |
| | 561 | struct vmpacket_descriptor desc; |
| | 562 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
| | 563 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
| | 564 | struct scatterlist bufferlist[3]; |
| | 565 | u64 aligned_data = 0; |
| | 566 | int ret; |
| | 567 | bool signal = false; |
| | 568 | |
| | 569 | |
| | 570 | /* Setup the descriptor */ |
| | 571 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
| | 572 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ |
| | 573 | /* in 8-bytes granularity */ |
| | 574 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
| | 575 | desc.len8 = (u16)(packetlen_aligned >> 3); |
| | 576 | desc.trans_id = requestid; |
| | 577 | |
| | 578 | sg_init_table(bufferlist, 3); |
| | 579 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); |
| | 580 | sg_set_buf(&bufferlist[1], buffer, bufferlen); |
| | 581 | sg_set_buf(&bufferlist[2], &aligned_data, |
| | 582 | packetlen_aligned - packetlen); |
| | 583 | |
| | 584 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
| | 585 | |
| | 586 | if (ret == 0 && signal) |
| | 587 | vmbus_setevent(channel); |
| | 588 | |
| | 589 | return ret; |
| | 590 | } |
| | 591 | EXPORT_SYMBOL(vmbus_sendpacket); |
| | 592 | |
| | 593 | /* |
| | 594 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
| | 595 | * packets using a GPADL Direct packet type. |
| | 596 | */ |
| | 597 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
| | 598 | struct hv_page_buffer pagebuffers[], |
| | 599 | u32 pagecount, void *buffer, u32 bufferlen, |
| | 600 | u64 requestid) |
| | 601 | { |
| | 602 | int ret; |
| | 603 | int i; |
| | 604 | struct vmbus_channel_packet_page_buffer desc; |
| | 605 | u32 descsize; |
| | 606 | u32 packetlen; |
| | 607 | u32 packetlen_aligned; |
| | 608 | struct scatterlist bufferlist[3]; |
| | 609 | u64 aligned_data = 0; |
| | 610 | bool signal = false; |
| | 611 | |
| | 612 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
| | 613 | return -EINVAL; |
| | 614 | |
| | 615 | |
| | 616 | /* |
| | 617 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
| | 618 | * largest size we support |
| | 619 | */ |
| | 620 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
| | 621 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * |
| | 622 | sizeof(struct hv_page_buffer)); |
| | 623 | packetlen = descsize + bufferlen; |
| | 624 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
| | 625 | |
| | 626 | /* Setup the descriptor */ |
| | 627 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
| | 628 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
| | 629 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
| | 630 | desc.length8 = (u16)(packetlen_aligned >> 3); |
| | 631 | desc.transactionid = requestid; |
| | 632 | desc.rangecount = pagecount; |
| | 633 | |
| | 634 | for (i = 0; i < pagecount; i++) { |
| | 635 | desc.range[i].len = pagebuffers[i].len; |
| | 636 | desc.range[i].offset = pagebuffers[i].offset; |
| | 637 | desc.range[i].pfn = pagebuffers[i].pfn; |
| | 638 | } |
| | 639 | |
| | 640 | sg_init_table(bufferlist, 3); |
| | 641 | sg_set_buf(&bufferlist[0], &desc, descsize); |
| | 642 | sg_set_buf(&bufferlist[1], buffer, bufferlen); |
| | 643 | sg_set_buf(&bufferlist[2], &aligned_data, |
| | 644 | packetlen_aligned - packetlen); |
| | 645 | |
| | 646 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
| | 647 | |
| | 648 | if (ret == 0 && signal) |
| | 649 | vmbus_setevent(channel); |
| | 650 | |
| | 651 | return ret; |
| | 652 | } |
| | 653 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
| | 654 | |
| | 655 | /* |
| | 656 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
| | 657 | * using a GPADL Direct packet type. |
| | 658 | */ |
| | 659 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
| | 660 | struct hv_multipage_buffer *multi_pagebuffer, |
| | 661 | void *buffer, u32 bufferlen, u64 requestid) |
| | 662 | { |
| | 663 | int ret; |
| | 664 | struct vmbus_channel_packet_multipage_buffer desc; |
| | 665 | u32 descsize; |
| | 666 | u32 packetlen; |
| | 667 | u32 packetlen_aligned; |
| | 668 | struct scatterlist bufferlist[3]; |
| | 669 | u64 aligned_data = 0; |
| | 670 | bool signal = false; |
| | 671 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
| | 672 | multi_pagebuffer->len); |
| | 673 | |
| | 674 | |
| | 675 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
| | 676 | return -EINVAL; |
| | 677 | |
| | 678 | /* |
| | 679 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
| | 680 | * the largest size we support |
| | 681 | */ |
| | 682 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
| | 683 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * |
| | 684 | sizeof(u64)); |
| | 685 | packetlen = descsize + bufferlen; |
| | 686 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
| | 687 | |
| | 688 | |
| | 689 | /* Setup the descriptor */ |
| | 690 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
| | 691 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
| | 692 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
| | 693 | desc.length8 = (u16)(packetlen_aligned >> 3); |
| | 694 | desc.transactionid = requestid; |
| | 695 | desc.rangecount = 1; |
| | 696 | |
| | 697 | desc.range.len = multi_pagebuffer->len; |
| | 698 | desc.range.offset = multi_pagebuffer->offset; |
| | 699 | |
| | 700 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
| | 701 | pfncount * sizeof(u64)); |
| | 702 | |
| | 703 | sg_init_table(bufferlist, 3); |
| | 704 | sg_set_buf(&bufferlist[0], &desc, descsize); |
| | 705 | sg_set_buf(&bufferlist[1], buffer, bufferlen); |
| | 706 | sg_set_buf(&bufferlist[2], &aligned_data, |
| | 707 | packetlen_aligned - packetlen); |
| | 708 | |
| | 709 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
| | 710 | |
| | 711 | if (ret == 0 && signal) |
| | 712 | vmbus_setevent(channel); |
| | 713 | |
| | 714 | return ret; |
| | 715 | } |
| | 716 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
| | 717 | |
| | 718 | /** |
| | 719 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
| | 720 | * @channel: Pointer to vmbus_channel structure. |
| | 721 | * @buffer: Pointer to the buffer you want to receive the data into. |
| | 722 | * @bufferlen: Maximum size of what the the buffer will hold |
| | 723 | * @buffer_actual_len: The actual size of the data after it was received |
| | 724 | * @requestid: Identifier of the request |
| | 725 | * |
| | 726 | * Receives directly from the hyper-v vmbus and puts the data it received |
| | 727 | * into Buffer. This will receive the data unparsed from hyper-v. |
| | 728 | * |
| | 729 | * Mainly used by Hyper-V drivers. |
| | 730 | */ |
| | 731 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
| | 732 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
| | 733 | { |
| | 734 | struct vmpacket_descriptor desc; |
| | 735 | u32 packetlen; |
| | 736 | u32 userlen; |
| | 737 | int ret; |
| | 738 | |
| | 739 | *buffer_actual_len = 0; |
| | 740 | *requestid = 0; |
| | 741 | |
| | 742 | |
| | 743 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
| | 744 | sizeof(struct vmpacket_descriptor)); |
| | 745 | if (ret != 0) |
| | 746 | return 0; |
| | 747 | |
| | 748 | packetlen = desc.len8 << 3; |
| | 749 | userlen = packetlen - (desc.offset8 << 3); |
| | 750 | |
| | 751 | *buffer_actual_len = userlen; |
| | 752 | |
| | 753 | if (userlen > bufferlen) { |
| | 754 | |
| | 755 | pr_err("Buffer too small - got %d needs %d\n", |
| | 756 | bufferlen, userlen); |
| | 757 | return -ETOOSMALL; |
| | 758 | } |
| | 759 | |
| | 760 | *requestid = desc.trans_id; |
| | 761 | |
| | 762 | /* Copy over the packet to the user buffer */ |
| | 763 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
| | 764 | (desc.offset8 << 3)); |
| | 765 | |
| | 766 | |
| | 767 | return 0; |
| | 768 | } |
| | 769 | EXPORT_SYMBOL(vmbus_recvpacket); |
| | 770 | |
| | 771 | /* |
| | 772 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
| | 773 | */ |
| | 774 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
| | 775 | u32 bufferlen, u32 *buffer_actual_len, |
| | 776 | u64 *requestid) |
| | 777 | { |
| | 778 | struct vmpacket_descriptor desc; |
| | 779 | u32 packetlen; |
| | 780 | u32 userlen; |
| | 781 | int ret; |
| | 782 | |
| | 783 | *buffer_actual_len = 0; |
| | 784 | *requestid = 0; |
| | 785 | |
| | 786 | |
| | 787 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
| | 788 | sizeof(struct vmpacket_descriptor)); |
| | 789 | if (ret != 0) |
| | 790 | return 0; |
| | 791 | |
| | 792 | |
| | 793 | packetlen = desc.len8 << 3; |
| | 794 | userlen = packetlen - (desc.offset8 << 3); |
| | 795 | |
| | 796 | *buffer_actual_len = packetlen; |
| | 797 | |
| | 798 | if (packetlen > bufferlen) { |
| | 799 | pr_err("Buffer too small - needed %d bytes but " |
| | 800 | "got space for only %d bytes\n", |
| | 801 | packetlen, bufferlen); |
| | 802 | return -ENOBUFS; |
| | 803 | } |
| | 804 | |
| | 805 | *requestid = desc.trans_id; |
| | 806 | |
| | 807 | /* Copy over the entire packet to the user buffer */ |
| | 808 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0); |
| | 809 | |
| | 810 | return 0; |
| | 811 | } |
| | 812 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame_incremental