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sys/dev/hyperv/utilities/hv_kvp.c
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1 /*- 2 * Copyright (c) 2014,2016-2017 Microsoft Corp. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 /* 28 * Author: Sainath Varanasi. 29 * Date: 4/2012 30 * Email: bsdic@microsoft.com 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/kernel.h> 38 #include <sys/conf.h> 39 #include <sys/uio.h> 40 #include <sys/bus.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/module.h> 44 #include <sys/reboot.h> 45 #include <sys/lock.h> 46 #include <sys/taskqueue.h> 47 #include <sys/selinfo.h> 48 #include <sys/sysctl.h> 49 #include <sys/poll.h> 50 #include <sys/proc.h> 51 #include <sys/kthread.h> 52 #include <sys/syscallsubr.h> 53 #include <sys/sysproto.h> 54 #include <sys/un.h> 55 #include <sys/endian.h> 56 #include <sys/_null.h> 57 #include <sys/sema.h> 58 #include <sys/signal.h> 59 #include <sys/syslog.h> 60 #include <sys/systm.h> 61 #include <sys/mutex.h> 62 63 #include <dev/hyperv/include/hyperv.h> 64 #include <dev/hyperv/include/vmbus.h> 65 #include <dev/hyperv/utilities/hv_utilreg.h> 66 #include <dev/hyperv/utilities/vmbus_icreg.h> 67 #include <dev/hyperv/utilities/vmbus_icvar.h> 68 69 #include "unicode.h" 70 #include "hv_kvp.h" 71 #include "vmbus_if.h" 72 73 /* hv_kvp defines */ 74 #define BUFFERSIZE sizeof(struct hv_kvp_msg) 75 #define kvp_hdr hdr.kvp_hdr 76 77 #define KVP_FWVER_MAJOR 3 78 #define KVP_FWVER VMBUS_IC_VERSION(KVP_FWVER_MAJOR, 0) 79 80 #define KVP_MSGVER_MAJOR 4 81 #define KVP_MSGVER VMBUS_IC_VERSION(KVP_MSGVER_MAJOR, 0) 82 83 /* hv_kvp debug control */ 84 static int hv_kvp_log = 0; 85 86 #define hv_kvp_log_error(...) do { \ 87 if (hv_kvp_log > 0) \ 88 log(LOG_ERR, "hv_kvp: " __VA_ARGS__); \ 89 } while (0) 90 91 #define hv_kvp_log_info(...) do { \ 92 if (hv_kvp_log > 1) \ 93 log(LOG_INFO, "hv_kvp: " __VA_ARGS__); \ 94 } while (0) 95 96 static const struct vmbus_ic_desc vmbus_kvp_descs[] = { 97 { 98 .ic_guid = { .hv_guid = { 99 0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d, 100 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6 } }, 101 .ic_desc = "Hyper-V KVP" 102 }, 103 VMBUS_IC_DESC_END 104 }; 105 106 /* character device prototypes */ 107 static d_open_t hv_kvp_dev_open; 108 static d_close_t hv_kvp_dev_close; 109 static d_read_t hv_kvp_dev_daemon_read; 110 static d_write_t hv_kvp_dev_daemon_write; 111 static d_poll_t hv_kvp_dev_daemon_poll; 112 113 /* hv_kvp character device structure */ 114 static struct cdevsw hv_kvp_cdevsw = 115 { 116 .d_version = D_VERSION, 117 .d_open = hv_kvp_dev_open, 118 .d_close = hv_kvp_dev_close, 119 .d_read = hv_kvp_dev_daemon_read, 120 .d_write = hv_kvp_dev_daemon_write, 121 .d_poll = hv_kvp_dev_daemon_poll, 122 .d_name = "hv_kvp_dev", 123 }; 124 125 126 /* 127 * Global state to track and synchronize multiple 128 * KVP transaction requests from the host. 129 */ 130 typedef struct hv_kvp_sc { 131 struct vmbus_ic_softc util_sc; 132 device_t dev; 133 134 /* Unless specified the pending mutex should be 135 * used to alter the values of the following parameters: 136 * 1. req_in_progress 137 * 2. req_timed_out 138 */ 139 struct mtx pending_mutex; 140 141 struct task task; 142 143 /* To track if transaction is active or not */ 144 boolean_t req_in_progress; 145 /* Tracks if daemon did not reply back in time */ 146 boolean_t req_timed_out; 147 /* Tracks if daemon is serving a request currently */ 148 boolean_t daemon_busy; 149 150 /* Length of host message */ 151 uint32_t host_msg_len; 152 153 /* Host message id */ 154 uint64_t host_msg_id; 155 156 /* Current kvp message from the host */ 157 struct hv_kvp_msg *host_kvp_msg; 158 159 /* Current kvp message for daemon */ 160 struct hv_kvp_msg daemon_kvp_msg; 161 162 /* Rcv buffer for communicating with the host*/ 163 uint8_t *rcv_buf; 164 165 /* Device semaphore to control communication */ 166 struct sema dev_sema; 167 168 /* Indicates if daemon registered with driver */ 169 boolean_t register_done; 170 171 /* Character device status */ 172 boolean_t dev_accessed; 173 174 struct cdev *hv_kvp_dev; 175 176 struct proc *daemon_task; 177 178 struct selinfo hv_kvp_selinfo; 179 } hv_kvp_sc; 180 181 /* hv_kvp prototypes */ 182 static int hv_kvp_req_in_progress(hv_kvp_sc *sc); 183 static void hv_kvp_transaction_init(hv_kvp_sc *sc, uint32_t, uint64_t, uint8_t *); 184 static void hv_kvp_send_msg_to_daemon(hv_kvp_sc *sc); 185 static void hv_kvp_process_request(void *context, int pending); 186 187 /* 188 * hv_kvp low level functions 189 */ 190 191 /* 192 * Check if kvp transaction is in progres 193 */ 194 static int 195 hv_kvp_req_in_progress(hv_kvp_sc *sc) 196 { 197 198 return (sc->req_in_progress); 199 } 200 201 202 /* 203 * This routine is called whenever a message is received from the host 204 */ 205 static void 206 hv_kvp_transaction_init(hv_kvp_sc *sc, uint32_t rcv_len, 207 uint64_t request_id, uint8_t *rcv_buf) 208 { 209 210 /* Store all the relevant message details in the global structure */ 211 /* Do not need to use mutex for req_in_progress here */ 212 sc->req_in_progress = true; 213 sc->host_msg_len = rcv_len; 214 sc->host_msg_id = request_id; 215 sc->rcv_buf = rcv_buf; 216 sc->host_kvp_msg = (struct hv_kvp_msg *)&rcv_buf[ 217 sizeof(struct hv_vmbus_pipe_hdr) + 218 sizeof(struct hv_vmbus_icmsg_hdr)]; 219 } 220 221 /* 222 * Convert ip related info in umsg from utf8 to utf16 and store in hmsg 223 */ 224 static int 225 hv_kvp_convert_utf8_ipinfo_to_utf16(struct hv_kvp_msg *umsg, 226 struct hv_kvp_ip_msg *host_ip_msg) 227 { 228 int err_ip, err_subnet, err_gway, err_dns, err_adap; 229 int UNUSED_FLAG = 1; 230 231 utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.ip_addr, 232 MAX_IP_ADDR_SIZE, 233 (char *)umsg->body.kvp_ip_val.ip_addr, 234 strlen((char *)umsg->body.kvp_ip_val.ip_addr), 235 UNUSED_FLAG, 236 &err_ip); 237 utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.sub_net, 238 MAX_IP_ADDR_SIZE, 239 (char *)umsg->body.kvp_ip_val.sub_net, 240 strlen((char *)umsg->body.kvp_ip_val.sub_net), 241 UNUSED_FLAG, 242 &err_subnet); 243 utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.gate_way, 244 MAX_GATEWAY_SIZE, 245 (char *)umsg->body.kvp_ip_val.gate_way, 246 strlen((char *)umsg->body.kvp_ip_val.gate_way), 247 UNUSED_FLAG, 248 &err_gway); 249 utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.dns_addr, 250 MAX_IP_ADDR_SIZE, 251 (char *)umsg->body.kvp_ip_val.dns_addr, 252 strlen((char *)umsg->body.kvp_ip_val.dns_addr), 253 UNUSED_FLAG, 254 &err_dns); 255 utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.adapter_id, 256 MAX_ADAPTER_ID_SIZE, 257 (char *)umsg->body.kvp_ip_val.adapter_id, 258 strlen((char *)umsg->body.kvp_ip_val.adapter_id), 259 UNUSED_FLAG, 260 &err_adap); 261 262 host_ip_msg->kvp_ip_val.dhcp_enabled = umsg->body.kvp_ip_val.dhcp_enabled; 263 host_ip_msg->kvp_ip_val.addr_family = umsg->body.kvp_ip_val.addr_family; 264 265 return (err_ip | err_subnet | err_gway | err_dns | err_adap); 266 } 267 268 269 /* 270 * Convert ip related info in hmsg from utf16 to utf8 and store in umsg 271 */ 272 static int 273 hv_kvp_convert_utf16_ipinfo_to_utf8(struct hv_kvp_ip_msg *host_ip_msg, 274 struct hv_kvp_msg *umsg) 275 { 276 int err_ip, err_subnet, err_gway, err_dns, err_adap; 277 int UNUSED_FLAG = 1; 278 device_t *devs; 279 int devcnt; 280 281 /* IP Address */ 282 utf16_to_utf8((char *)umsg->body.kvp_ip_val.ip_addr, 283 MAX_IP_ADDR_SIZE, 284 (uint16_t *)host_ip_msg->kvp_ip_val.ip_addr, 285 MAX_IP_ADDR_SIZE, 286 UNUSED_FLAG, 287 &err_ip); 288 289 /* Adapter ID : GUID */ 290 utf16_to_utf8((char *)umsg->body.kvp_ip_val.adapter_id, 291 MAX_ADAPTER_ID_SIZE, 292 (uint16_t *)host_ip_msg->kvp_ip_val.adapter_id, 293 MAX_ADAPTER_ID_SIZE, 294 UNUSED_FLAG, 295 &err_adap); 296 297 if (devclass_get_devices(devclass_find("hn"), &devs, &devcnt) == 0) { 298 for (devcnt = devcnt - 1; devcnt >= 0; devcnt--) { 299 device_t dev = devs[devcnt]; 300 struct vmbus_channel *chan; 301 char buf[HYPERV_GUID_STRLEN]; 302 int n; 303 304 chan = vmbus_get_channel(dev); 305 n = hyperv_guid2str(vmbus_chan_guid_inst(chan), buf, 306 sizeof(buf)); 307 308 /* 309 * The string in the 'kvp_ip_val.adapter_id' has 310 * braces around the GUID; skip the leading brace 311 * in 'kvp_ip_val.adapter_id'. 312 */ 313 if (strncmp(buf, 314 ((char *)&umsg->body.kvp_ip_val.adapter_id) + 1, 315 n) == 0) { 316 strlcpy((char *)umsg->body.kvp_ip_val.adapter_id, 317 device_get_nameunit(dev), MAX_ADAPTER_ID_SIZE); 318 break; 319 } 320 } 321 free(devs, M_TEMP); 322 } 323 324 /* Address Family , DHCP , SUBNET, Gateway, DNS */ 325 umsg->kvp_hdr.operation = host_ip_msg->operation; 326 umsg->body.kvp_ip_val.addr_family = host_ip_msg->kvp_ip_val.addr_family; 327 umsg->body.kvp_ip_val.dhcp_enabled = host_ip_msg->kvp_ip_val.dhcp_enabled; 328 utf16_to_utf8((char *)umsg->body.kvp_ip_val.sub_net, MAX_IP_ADDR_SIZE, 329 (uint16_t *)host_ip_msg->kvp_ip_val.sub_net, 330 MAX_IP_ADDR_SIZE, 331 UNUSED_FLAG, 332 &err_subnet); 333 334 utf16_to_utf8((char *)umsg->body.kvp_ip_val.gate_way, MAX_GATEWAY_SIZE, 335 (uint16_t *)host_ip_msg->kvp_ip_val.gate_way, 336 MAX_GATEWAY_SIZE, 337 UNUSED_FLAG, 338 &err_gway); 339 340 utf16_to_utf8((char *)umsg->body.kvp_ip_val.dns_addr, MAX_IP_ADDR_SIZE, 341 (uint16_t *)host_ip_msg->kvp_ip_val.dns_addr, 342 MAX_IP_ADDR_SIZE, 343 UNUSED_FLAG, 344 &err_dns); 345 346 return (err_ip | err_subnet | err_gway | err_dns | err_adap); 347 } 348 349 350 /* 351 * Prepare a user kvp msg based on host kvp msg (utf16 to utf8) 352 * Ensure utf16_utf8 takes care of the additional string terminating char!! 353 */ 354 static void 355 hv_kvp_convert_hostmsg_to_usermsg(struct hv_kvp_msg *hmsg, struct hv_kvp_msg *umsg) 356 { 357 int utf_err = 0; 358 uint32_t value_type; 359 struct hv_kvp_ip_msg *host_ip_msg; 360 361 host_ip_msg = (struct hv_kvp_ip_msg*)hmsg; 362 memset(umsg, 0, sizeof(struct hv_kvp_msg)); 363 364 umsg->kvp_hdr.operation = hmsg->kvp_hdr.operation; 365 umsg->kvp_hdr.pool = hmsg->kvp_hdr.pool; 366 367 switch (umsg->kvp_hdr.operation) { 368 case HV_KVP_OP_SET_IP_INFO: 369 hv_kvp_convert_utf16_ipinfo_to_utf8(host_ip_msg, umsg); 370 break; 371 372 case HV_KVP_OP_GET_IP_INFO: 373 utf16_to_utf8((char *)umsg->body.kvp_ip_val.adapter_id, 374 MAX_ADAPTER_ID_SIZE, 375 (uint16_t *)host_ip_msg->kvp_ip_val.adapter_id, 376 MAX_ADAPTER_ID_SIZE, 1, &utf_err); 377 378 umsg->body.kvp_ip_val.addr_family = 379 host_ip_msg->kvp_ip_val.addr_family; 380 break; 381 382 case HV_KVP_OP_SET: 383 value_type = hmsg->body.kvp_set.data.value_type; 384 385 switch (value_type) { 386 case HV_REG_SZ: 387 umsg->body.kvp_set.data.value_size = 388 utf16_to_utf8( 389 (char *)umsg->body.kvp_set.data.msg_value.value, 390 HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1, 391 (uint16_t *)hmsg->body.kvp_set.data.msg_value.value, 392 hmsg->body.kvp_set.data.value_size, 393 1, &utf_err); 394 /* utf8 encoding */ 395 umsg->body.kvp_set.data.value_size = 396 umsg->body.kvp_set.data.value_size / 2; 397 break; 398 399 case HV_REG_U32: 400 umsg->body.kvp_set.data.value_size = 401 sprintf(umsg->body.kvp_set.data.msg_value.value, "%d", 402 hmsg->body.kvp_set.data.msg_value.value_u32) + 1; 403 break; 404 405 case HV_REG_U64: 406 umsg->body.kvp_set.data.value_size = 407 sprintf(umsg->body.kvp_set.data.msg_value.value, "%llu", 408 (unsigned long long) 409 hmsg->body.kvp_set.data.msg_value.value_u64) + 1; 410 break; 411 } 412 413 umsg->body.kvp_set.data.key_size = 414 utf16_to_utf8( 415 umsg->body.kvp_set.data.key, 416 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1, 417 (uint16_t *)hmsg->body.kvp_set.data.key, 418 hmsg->body.kvp_set.data.key_size, 419 1, &utf_err); 420 421 /* utf8 encoding */ 422 umsg->body.kvp_set.data.key_size = 423 umsg->body.kvp_set.data.key_size / 2; 424 break; 425 426 case HV_KVP_OP_GET: 427 umsg->body.kvp_get.data.key_size = 428 utf16_to_utf8(umsg->body.kvp_get.data.key, 429 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1, 430 (uint16_t *)hmsg->body.kvp_get.data.key, 431 hmsg->body.kvp_get.data.key_size, 432 1, &utf_err); 433 /* utf8 encoding */ 434 umsg->body.kvp_get.data.key_size = 435 umsg->body.kvp_get.data.key_size / 2; 436 break; 437 438 case HV_KVP_OP_DELETE: 439 umsg->body.kvp_delete.key_size = 440 utf16_to_utf8(umsg->body.kvp_delete.key, 441 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1, 442 (uint16_t *)hmsg->body.kvp_delete.key, 443 hmsg->body.kvp_delete.key_size, 444 1, &utf_err); 445 /* utf8 encoding */ 446 umsg->body.kvp_delete.key_size = 447 umsg->body.kvp_delete.key_size / 2; 448 break; 449 450 case HV_KVP_OP_ENUMERATE: 451 umsg->body.kvp_enum_data.index = 452 hmsg->body.kvp_enum_data.index; 453 break; 454 455 default: 456 hv_kvp_log_info("%s: daemon_kvp_msg: Invalid operation : %d\n", 457 __func__, umsg->kvp_hdr.operation); 458 } 459 } 460 461 462 /* 463 * Prepare a host kvp msg based on user kvp msg (utf8 to utf16) 464 */ 465 static int 466 hv_kvp_convert_usermsg_to_hostmsg(struct hv_kvp_msg *umsg, struct hv_kvp_msg *hmsg) 467 { 468 int hkey_len = 0, hvalue_len = 0, utf_err = 0; 469 struct hv_kvp_exchg_msg_value *host_exchg_data; 470 char *key_name, *value; 471 472 struct hv_kvp_ip_msg *host_ip_msg = (struct hv_kvp_ip_msg *)hmsg; 473 474 switch (hmsg->kvp_hdr.operation) { 475 case HV_KVP_OP_GET_IP_INFO: 476 return (hv_kvp_convert_utf8_ipinfo_to_utf16(umsg, host_ip_msg)); 477 478 case HV_KVP_OP_SET_IP_INFO: 479 case HV_KVP_OP_SET: 480 case HV_KVP_OP_DELETE: 481 return (0); 482 483 case HV_KVP_OP_ENUMERATE: 484 host_exchg_data = &hmsg->body.kvp_enum_data.data; 485 key_name = umsg->body.kvp_enum_data.data.key; 486 hkey_len = utf8_to_utf16((uint16_t *)host_exchg_data->key, 487 ((HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2), 488 key_name, strlen(key_name), 489 1, &utf_err); 490 /* utf16 encoding */ 491 host_exchg_data->key_size = 2 * (hkey_len + 1); 492 value = umsg->body.kvp_enum_data.data.msg_value.value; 493 hvalue_len = utf8_to_utf16( 494 (uint16_t *)host_exchg_data->msg_value.value, 495 ((HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2), 496 value, strlen(value), 497 1, &utf_err); 498 host_exchg_data->value_size = 2 * (hvalue_len + 1); 499 host_exchg_data->value_type = HV_REG_SZ; 500 501 if ((hkey_len < 0) || (hvalue_len < 0)) 502 return (EINVAL); 503 504 return (0); 505 506 case HV_KVP_OP_GET: 507 host_exchg_data = &hmsg->body.kvp_get.data; 508 value = umsg->body.kvp_get.data.msg_value.value; 509 hvalue_len = utf8_to_utf16( 510 (uint16_t *)host_exchg_data->msg_value.value, 511 ((HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2), 512 value, strlen(value), 513 1, &utf_err); 514 /* Convert value size to uft16 */ 515 host_exchg_data->value_size = 2 * (hvalue_len + 1); 516 /* Use values by string */ 517 host_exchg_data->value_type = HV_REG_SZ; 518 519 if (hvalue_len < 0) 520 return (EINVAL); 521 522 return (0); 523 524 default: 525 return (EINVAL); 526 } 527 } 528 529 530 /* 531 * Send the response back to the host. 532 */ 533 static void 534 hv_kvp_respond_host(hv_kvp_sc *sc, uint32_t error) 535 { 536 struct hv_vmbus_icmsg_hdr *hv_icmsg_hdrp; 537 538 hv_icmsg_hdrp = (struct hv_vmbus_icmsg_hdr *) 539 &sc->rcv_buf[sizeof(struct hv_vmbus_pipe_hdr)]; 540 541 hv_icmsg_hdrp->status = error; 542 hv_icmsg_hdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION | 543 HV_ICMSGHDRFLAG_RESPONSE; 544 545 error = vmbus_chan_send(vmbus_get_channel(sc->dev), 546 VMBUS_CHANPKT_TYPE_INBAND, 0, sc->rcv_buf, sc->host_msg_len, 547 sc->host_msg_id); 548 if (error) 549 hv_kvp_log_info("%s: hv_kvp_respond_host: sendpacket error:%d\n", 550 __func__, error); 551 } 552 553 554 /* 555 * This is the main kvp kernel process that interacts with both user daemon 556 * and the host 557 */ 558 static void 559 hv_kvp_send_msg_to_daemon(hv_kvp_sc *sc) 560 { 561 struct hv_kvp_msg *hmsg = sc->host_kvp_msg; 562 struct hv_kvp_msg *umsg = &sc->daemon_kvp_msg; 563 564 /* Prepare kvp_msg to be sent to user */ 565 hv_kvp_convert_hostmsg_to_usermsg(hmsg, umsg); 566 567 /* Send the msg to user via function deamon_read - setting sema */ 568 sema_post(&sc->dev_sema); 569 570 /* We should wake up the daemon, in case it's doing poll() */ 571 selwakeup(&sc->hv_kvp_selinfo); 572 } 573 574 575 /* 576 * Function to read the kvp request buffer from host 577 * and interact with daemon 578 */ 579 static void 580 hv_kvp_process_request(void *context, int pending) 581 { 582 uint8_t *kvp_buf; 583 struct vmbus_channel *channel; 584 uint32_t recvlen = 0; 585 uint64_t requestid; 586 struct hv_vmbus_icmsg_hdr *icmsghdrp; 587 int ret = 0, error; 588 hv_kvp_sc *sc; 589 590 hv_kvp_log_info("%s: entering hv_kvp_process_request\n", __func__); 591 592 sc = (hv_kvp_sc*)context; 593 kvp_buf = sc->util_sc.ic_buf; 594 channel = vmbus_get_channel(sc->dev); 595 596 recvlen = sc->util_sc.ic_buflen; 597 ret = vmbus_chan_recv(channel, kvp_buf, &recvlen, &requestid); 598 KASSERT(ret != ENOBUFS, ("hvkvp recvbuf is not large enough")); 599 /* XXX check recvlen to make sure that it contains enough data */ 600 601 while ((ret == 0) && (recvlen > 0)) { 602 icmsghdrp = (struct hv_vmbus_icmsg_hdr *) 603 &kvp_buf[sizeof(struct hv_vmbus_pipe_hdr)]; 604 605 hv_kvp_transaction_init(sc, recvlen, requestid, kvp_buf); 606 if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) { 607 error = vmbus_ic_negomsg(&sc->util_sc, 608 kvp_buf, &recvlen, KVP_FWVER, KVP_MSGVER); 609 /* XXX handle vmbus_ic_negomsg failure. */ 610 if (!error) 611 hv_kvp_respond_host(sc, HV_S_OK); 612 else 613 hv_kvp_respond_host(sc, HV_E_FAIL); 614 /* 615 * It is ok to not acquire the mutex before setting 616 * req_in_progress here because negotiation is the 617 * first thing that happens and hence there is no 618 * chance of a race condition. 619 */ 620 621 sc->req_in_progress = false; 622 hv_kvp_log_info("%s :version negotiated\n", __func__); 623 624 } else { 625 if (!sc->daemon_busy) { 626 627 hv_kvp_log_info("%s: issuing qury to daemon\n", __func__); 628 mtx_lock(&sc->pending_mutex); 629 sc->req_timed_out = false; 630 sc->daemon_busy = true; 631 mtx_unlock(&sc->pending_mutex); 632 633 hv_kvp_send_msg_to_daemon(sc); 634 hv_kvp_log_info("%s: waiting for daemon\n", __func__); 635 } 636 637 /* Wait 5 seconds for daemon to respond back */ 638 tsleep(sc, 0, "kvpworkitem", 5 * hz); 639 hv_kvp_log_info("%s: came out of wait\n", __func__); 640 } 641 642 mtx_lock(&sc->pending_mutex); 643 644 /* Notice that once req_timed_out is set to true 645 * it will remain true until the next request is 646 * sent to the daemon. The response from daemon 647 * is forwarded to host only when this flag is 648 * false. 649 */ 650 sc->req_timed_out = true; 651 652 /* 653 * Cancel request if so need be. 654 */ 655 if (hv_kvp_req_in_progress(sc)) { 656 hv_kvp_log_info("%s: request was still active after wait so failing\n", __func__); 657 hv_kvp_respond_host(sc, HV_E_FAIL); 658 sc->req_in_progress = false; 659 } 660 661 mtx_unlock(&sc->pending_mutex); 662 663 /* 664 * Try reading next buffer 665 */ 666 recvlen = sc->util_sc.ic_buflen; 667 ret = vmbus_chan_recv(channel, kvp_buf, &recvlen, &requestid); 668 KASSERT(ret != ENOBUFS, ("hvkvp recvbuf is not large enough")); 669 /* XXX check recvlen to make sure that it contains enough data */ 670 671 hv_kvp_log_info("%s: read: context %p, ret =%d, recvlen=%d\n", 672 __func__, context, ret, recvlen); 673 } 674 } 675 676 677 /* 678 * Callback routine that gets called whenever there is a message from host 679 */ 680 static void 681 hv_kvp_callback(struct vmbus_channel *chan __unused, void *context) 682 { 683 hv_kvp_sc *sc = (hv_kvp_sc*)context; 684 /* 685 The first request from host will not be handled until daemon is registered. 686 when callback is triggered without a registered daemon, callback just return. 687 When a new daemon gets regsitered, this callbcak is trigged from _write op. 688 */ 689 if (sc->register_done) { 690 hv_kvp_log_info("%s: Queuing work item\n", __func__); 691 taskqueue_enqueue(taskqueue_thread, &sc->task); 692 } 693 } 694 695 static int 696 hv_kvp_dev_open(struct cdev *dev, int oflags, int devtype, 697 struct thread *td) 698 { 699 hv_kvp_sc *sc = (hv_kvp_sc*)dev->si_drv1; 700 701 hv_kvp_log_info("%s: Opened device \"hv_kvp_device\" successfully.\n", __func__); 702 if (sc->dev_accessed) 703 return (-EBUSY); 704 705 sc->daemon_task = curproc; 706 sc->dev_accessed = true; 707 sc->daemon_busy = false; 708 return (0); 709 } 710 711 712 static int 713 hv_kvp_dev_close(struct cdev *dev __unused, int fflag __unused, int devtype __unused, 714 struct thread *td __unused) 715 { 716 hv_kvp_sc *sc = (hv_kvp_sc*)dev->si_drv1; 717 718 hv_kvp_log_info("%s: Closing device \"hv_kvp_device\".\n", __func__); 719 sc->dev_accessed = false; 720 sc->register_done = false; 721 return (0); 722 } 723 724 725 /* 726 * hv_kvp_daemon read invokes this function 727 * acts as a send to daemon 728 */ 729 static int 730 hv_kvp_dev_daemon_read(struct cdev *dev, struct uio *uio, int ioflag __unused) 731 { 732 size_t amt; 733 int error = 0; 734 struct hv_kvp_msg *hv_kvp_dev_buf; 735 hv_kvp_sc *sc = (hv_kvp_sc*)dev->si_drv1; 736 737 /* Read is not allowed util registering is done. */ 738 if (!sc->register_done) 739 return (EPERM); 740 741 sema_wait(&sc->dev_sema); 742 743 hv_kvp_dev_buf = malloc(sizeof(*hv_kvp_dev_buf), M_TEMP, M_WAITOK); 744 memcpy(hv_kvp_dev_buf, &sc->daemon_kvp_msg, sizeof(struct hv_kvp_msg)); 745 746 amt = MIN(uio->uio_resid, uio->uio_offset >= BUFFERSIZE + 1 ? 0 : 747 BUFFERSIZE + 1 - uio->uio_offset); 748 749 if ((error = uiomove(hv_kvp_dev_buf, amt, uio)) != 0) 750 hv_kvp_log_info("%s: hv_kvp uiomove read failed!\n", __func__); 751 752 free(hv_kvp_dev_buf, M_TEMP); 753 return (error); 754 } 755 756 757 /* 758 * hv_kvp_daemon write invokes this function 759 * acts as a receive from daemon 760 */ 761 static int 762 hv_kvp_dev_daemon_write(struct cdev *dev, struct uio *uio, int ioflag __unused) 763 { 764 size_t amt; 765 int error = 0; 766 struct hv_kvp_msg *hv_kvp_dev_buf; 767 hv_kvp_sc *sc = (hv_kvp_sc*)dev->si_drv1; 768 769 uio->uio_offset = 0; 770 hv_kvp_dev_buf = malloc(sizeof(*hv_kvp_dev_buf), M_TEMP, M_WAITOK); 771 772 amt = MIN(uio->uio_resid, BUFFERSIZE); 773 error = uiomove(hv_kvp_dev_buf, amt, uio); 774 775 if (error != 0) { 776 free(hv_kvp_dev_buf, M_TEMP); 777 return (error); 778 } 779 memcpy(&sc->daemon_kvp_msg, hv_kvp_dev_buf, sizeof(struct hv_kvp_msg)); 780 781 free(hv_kvp_dev_buf, M_TEMP); 782 if (sc->register_done == false) { 783 if (sc->daemon_kvp_msg.kvp_hdr.operation == HV_KVP_OP_REGISTER) { 784 sc->register_done = true; 785 hv_kvp_callback(vmbus_get_channel(sc->dev), dev->si_drv1); 786 } 787 else { 788 hv_kvp_log_info("%s, KVP Registration Failed\n", __func__); 789 return (EINVAL); 790 } 791 } else { 792 793 mtx_lock(&sc->pending_mutex); 794 795 if(!sc->req_timed_out) { 796 struct hv_kvp_msg *hmsg = sc->host_kvp_msg; 797 struct hv_kvp_msg *umsg = &sc->daemon_kvp_msg; 798 799 error = hv_kvp_convert_usermsg_to_hostmsg(umsg, hmsg); 800 hv_kvp_respond_host(sc, umsg->hdr.error); 801 wakeup(sc); 802 sc->req_in_progress = false; 803 if (umsg->hdr.error != HV_S_OK) 804 hv_kvp_log_info("%s, Error 0x%x from daemon\n", 805 __func__, umsg->hdr.error); 806 if (error) 807 hv_kvp_log_info("%s, Error from convert\n", __func__); 808 } 809 810 sc->daemon_busy = false; 811 mtx_unlock(&sc->pending_mutex); 812 } 813 814 return (error); 815 } 816 817 818 /* 819 * hv_kvp_daemon poll invokes this function to check if data is available 820 * for daemon to read. 821 */ 822 static int 823 hv_kvp_dev_daemon_poll(struct cdev *dev, int events, struct thread *td) 824 { 825 int revents = 0; 826 hv_kvp_sc *sc = (hv_kvp_sc*)dev->si_drv1; 827 828 mtx_lock(&sc->pending_mutex); 829 /* 830 * We check global flag daemon_busy for the data availiability for 831 * userland to read. Deamon_busy is set to true before driver has data 832 * for daemon to read. It is set to false after daemon sends 833 * then response back to driver. 834 */ 835 if (sc->daemon_busy == true) 836 revents = POLLIN; 837 else 838 selrecord(td, &sc->hv_kvp_selinfo); 839 840 mtx_unlock(&sc->pending_mutex); 841 842 return (revents); 843 } 844 845 static int 846 hv_kvp_probe(device_t dev) 847 { 848 849 return (vmbus_ic_probe(dev, vmbus_kvp_descs)); 850 } 851 852 static int 853 hv_kvp_attach(device_t dev) 854 { 855 int error; 856 struct sysctl_oid_list *child; 857 struct sysctl_ctx_list *ctx; 858 859 hv_kvp_sc *sc = (hv_kvp_sc*)device_get_softc(dev); 860 861 sc->dev = dev; 862 sema_init(&sc->dev_sema, 0, "hv_kvp device semaphore"); 863 mtx_init(&sc->pending_mutex, "hv-kvp pending mutex", 864 NULL, MTX_DEF); 865 866 ctx = device_get_sysctl_ctx(dev); 867 child = SYSCTL_CHILDREN(device_get_sysctl_tree(dev)); 868 869 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "hv_kvp_log", 870 CTLFLAG_RWTUN, &hv_kvp_log, 0, "Hyperv KVP service log level"); 871 872 TASK_INIT(&sc->task, 0, hv_kvp_process_request, sc); 873 874 /* create character device */ 875 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, 876 &sc->hv_kvp_dev, 877 &hv_kvp_cdevsw, 878 0, 879 UID_ROOT, 880 GID_WHEEL, 881 0640, 882 "hv_kvp_dev"); 883 884 if (error != 0) 885 return (error); 886 sc->hv_kvp_dev->si_drv1 = sc; 887 888 return (vmbus_ic_attach(dev, hv_kvp_callback)); 889 } 890 891 static int 892 hv_kvp_detach(device_t dev) 893 { 894 hv_kvp_sc *sc = (hv_kvp_sc*)device_get_softc(dev); 895 896 if (sc->daemon_task != NULL) { 897 PROC_LOCK(sc->daemon_task); 898 kern_psignal(sc->daemon_task, SIGKILL); 899 PROC_UNLOCK(sc->daemon_task); 900 } 901 902 destroy_dev(sc->hv_kvp_dev); 903 return (vmbus_ic_detach(dev)); 904 } 905 906 static device_method_t kvp_methods[] = { 907 /* Device interface */ 908 DEVMETHOD(device_probe, hv_kvp_probe), 909 DEVMETHOD(device_attach, hv_kvp_attach), 910 DEVMETHOD(device_detach, hv_kvp_detach), 911 { 0, 0 } 912 }; 913 914 static driver_t kvp_driver = { "hvkvp", kvp_methods, sizeof(hv_kvp_sc)}; 915 916 DRIVER_MODULE(hv_kvp, vmbus, kvp_driver, NULL, NULL); 917 MODULE_VERSION(hv_kvp, 1); 918 MODULE_DEPEND(hv_kvp, vmbus, 1, 1, 1);
Cache object: 3c8914f87b9b4537f59d2576e19d1728
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