Tomas Winkler | 9ca9050 | 2013-01-08 23:07:13 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * |
| 3 | * Intel Management Engine Interface (Intel MEI) Linux driver |
| 4 | * Copyright (c) 2003-2012, Intel Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/pci.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/wait.h> |
| 20 | #include <linux/delay.h> |
| 21 | |
| 22 | #include <linux/mei.h> |
| 23 | |
| 24 | #include "mei_dev.h" |
| 25 | #include "hbm.h" |
| 26 | #include "interface.h" |
| 27 | |
| 28 | |
| 29 | /** |
| 30 | * mei_io_list_flush - removes list entry belonging to cl. |
| 31 | * |
| 32 | * @list: An instance of our list structure |
| 33 | * @cl: host client |
| 34 | */ |
| 35 | void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl) |
| 36 | { |
| 37 | struct mei_cl_cb *cb; |
| 38 | struct mei_cl_cb *next; |
| 39 | |
| 40 | list_for_each_entry_safe(cb, next, &list->list, list) { |
| 41 | if (cb->cl && mei_cl_cmp_id(cl, cb->cl)) |
| 42 | list_del(&cb->list); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * mei_io_cb_free - free mei_cb_private related memory |
| 48 | * |
| 49 | * @cb: mei callback struct |
| 50 | */ |
| 51 | void mei_io_cb_free(struct mei_cl_cb *cb) |
| 52 | { |
| 53 | if (cb == NULL) |
| 54 | return; |
| 55 | |
| 56 | kfree(cb->request_buffer.data); |
| 57 | kfree(cb->response_buffer.data); |
| 58 | kfree(cb); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * mei_io_cb_init - allocate and initialize io callback |
| 63 | * |
| 64 | * @cl - mei client |
| 65 | * @file: pointer to file structure |
| 66 | * |
| 67 | * returns mei_cl_cb pointer or NULL; |
| 68 | */ |
| 69 | struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp) |
| 70 | { |
| 71 | struct mei_cl_cb *cb; |
| 72 | |
| 73 | cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL); |
| 74 | if (!cb) |
| 75 | return NULL; |
| 76 | |
| 77 | mei_io_list_init(cb); |
| 78 | |
| 79 | cb->file_object = fp; |
| 80 | cb->cl = cl; |
| 81 | cb->buf_idx = 0; |
| 82 | return cb; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * mei_io_cb_alloc_req_buf - allocate request buffer |
| 87 | * |
| 88 | * @cb - io callback structure |
| 89 | * @size: size of the buffer |
| 90 | * |
| 91 | * returns 0 on success |
| 92 | * -EINVAL if cb is NULL |
| 93 | * -ENOMEM if allocation failed |
| 94 | */ |
| 95 | int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length) |
| 96 | { |
| 97 | if (!cb) |
| 98 | return -EINVAL; |
| 99 | |
| 100 | if (length == 0) |
| 101 | return 0; |
| 102 | |
| 103 | cb->request_buffer.data = kmalloc(length, GFP_KERNEL); |
| 104 | if (!cb->request_buffer.data) |
| 105 | return -ENOMEM; |
| 106 | cb->request_buffer.size = length; |
| 107 | return 0; |
| 108 | } |
| 109 | /** |
| 110 | * mei_io_cb_alloc_req_buf - allocate respose buffer |
| 111 | * |
| 112 | * @cb - io callback structure |
| 113 | * @size: size of the buffer |
| 114 | * |
| 115 | * returns 0 on success |
| 116 | * -EINVAL if cb is NULL |
| 117 | * -ENOMEM if allocation failed |
| 118 | */ |
| 119 | int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length) |
| 120 | { |
| 121 | if (!cb) |
| 122 | return -EINVAL; |
| 123 | |
| 124 | if (length == 0) |
| 125 | return 0; |
| 126 | |
| 127 | cb->response_buffer.data = kmalloc(length, GFP_KERNEL); |
| 128 | if (!cb->response_buffer.data) |
| 129 | return -ENOMEM; |
| 130 | cb->response_buffer.size = length; |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | |
| 135 | |
| 136 | /** |
| 137 | * mei_cl_flush_queues - flushes queue lists belonging to cl. |
| 138 | * |
| 139 | * @dev: the device structure |
| 140 | * @cl: host client |
| 141 | */ |
| 142 | int mei_cl_flush_queues(struct mei_cl *cl) |
| 143 | { |
| 144 | if (!cl || !cl->dev) |
| 145 | return -EINVAL; |
| 146 | |
| 147 | dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n"); |
| 148 | mei_io_list_flush(&cl->dev->read_list, cl); |
| 149 | mei_io_list_flush(&cl->dev->write_list, cl); |
| 150 | mei_io_list_flush(&cl->dev->write_waiting_list, cl); |
| 151 | mei_io_list_flush(&cl->dev->ctrl_wr_list, cl); |
| 152 | mei_io_list_flush(&cl->dev->ctrl_rd_list, cl); |
| 153 | mei_io_list_flush(&cl->dev->amthif_cmd_list, cl); |
| 154 | mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl); |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * mei_me_cl_by_uuid - locate index of me client |
| 160 | * |
| 161 | * @dev: mei device |
| 162 | * returns me client index or -ENOENT if not found |
| 163 | */ |
| 164 | int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *uuid) |
| 165 | { |
| 166 | int i, res = -ENOENT; |
| 167 | |
| 168 | for (i = 0; i < dev->me_clients_num; ++i) |
| 169 | if (uuid_le_cmp(*uuid, |
| 170 | dev->me_clients[i].props.protocol_name) == 0) { |
| 171 | res = i; |
| 172 | break; |
| 173 | } |
| 174 | |
| 175 | return res; |
| 176 | } |
| 177 | |
| 178 | |
| 179 | /** |
| 180 | * mei_me_cl_by_id return index to me_clients for client_id |
| 181 | * |
| 182 | * @dev: the device structure |
| 183 | * @client_id: me client id |
| 184 | * |
| 185 | * Locking: called under "dev->device_lock" lock |
| 186 | * |
| 187 | * returns index on success, -ENOENT on failure. |
| 188 | */ |
| 189 | |
| 190 | int mei_me_cl_by_id(struct mei_device *dev, u8 client_id) |
| 191 | { |
| 192 | int i; |
| 193 | for (i = 0; i < dev->me_clients_num; i++) |
| 194 | if (dev->me_clients[i].client_id == client_id) |
| 195 | break; |
| 196 | if (WARN_ON(dev->me_clients[i].client_id != client_id)) |
| 197 | return -ENOENT; |
| 198 | |
| 199 | if (i == dev->me_clients_num) |
| 200 | return -ENOENT; |
| 201 | |
| 202 | return i; |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * mei_cl_init - initializes intialize cl. |
| 207 | * |
| 208 | * @cl: host client to be initialized |
| 209 | * @dev: mei device |
| 210 | */ |
| 211 | void mei_cl_init(struct mei_cl *cl, struct mei_device *dev) |
| 212 | { |
| 213 | memset(cl, 0, sizeof(struct mei_cl)); |
| 214 | init_waitqueue_head(&cl->wait); |
| 215 | init_waitqueue_head(&cl->rx_wait); |
| 216 | init_waitqueue_head(&cl->tx_wait); |
| 217 | INIT_LIST_HEAD(&cl->link); |
| 218 | cl->reading_state = MEI_IDLE; |
| 219 | cl->writing_state = MEI_IDLE; |
| 220 | cl->dev = dev; |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * mei_cl_allocate - allocates cl structure and sets it up. |
| 225 | * |
| 226 | * @dev: mei device |
| 227 | * returns The allocated file or NULL on failure |
| 228 | */ |
| 229 | struct mei_cl *mei_cl_allocate(struct mei_device *dev) |
| 230 | { |
| 231 | struct mei_cl *cl; |
| 232 | |
| 233 | cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL); |
| 234 | if (!cl) |
| 235 | return NULL; |
| 236 | |
| 237 | mei_cl_init(cl, dev); |
| 238 | |
| 239 | return cl; |
| 240 | } |
| 241 | |
| 242 | |
| 243 | /** |
| 244 | * mei_me_cl_link - create link between host and me clinet and add |
| 245 | * me_cl to the list |
| 246 | * |
| 247 | * @dev: the device structure |
| 248 | * @cl: link between me and host client assocated with opened file descriptor |
| 249 | * @uuid: uuid of ME client |
| 250 | * @client_id: id of the host client |
| 251 | * |
| 252 | * returns ME client index if ME client |
| 253 | * -EINVAL on incorrect values |
| 254 | * -ENONET if client not found |
| 255 | */ |
| 256 | int mei_me_cl_link(struct mei_device *dev, struct mei_cl *cl, |
| 257 | const uuid_le *uuid, u8 host_cl_id) |
| 258 | { |
| 259 | int i; |
| 260 | |
| 261 | if (!dev || !cl || !uuid) |
| 262 | return -EINVAL; |
| 263 | |
| 264 | /* check for valid client id */ |
| 265 | i = mei_me_cl_by_uuid(dev, uuid); |
| 266 | if (i >= 0) { |
| 267 | cl->me_client_id = dev->me_clients[i].client_id; |
| 268 | cl->state = MEI_FILE_CONNECTING; |
| 269 | cl->host_client_id = host_cl_id; |
| 270 | |
| 271 | list_add_tail(&cl->link, &dev->file_list); |
| 272 | return (u8)i; |
| 273 | } |
| 274 | |
| 275 | return -ENOENT; |
| 276 | } |
| 277 | /** |
| 278 | * mei_me_cl_unlink - remove me_cl from the list |
| 279 | * |
| 280 | * @dev: the device structure |
| 281 | * @host_client_id: host client id to be removed |
| 282 | */ |
| 283 | void mei_me_cl_unlink(struct mei_device *dev, struct mei_cl *cl) |
| 284 | { |
| 285 | struct mei_cl *pos, *next; |
| 286 | list_for_each_entry_safe(pos, next, &dev->file_list, link) { |
| 287 | if (cl->host_client_id == pos->host_client_id) { |
| 288 | dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n", |
| 289 | pos->host_client_id, pos->me_client_id); |
| 290 | list_del_init(&pos->link); |
| 291 | break; |
| 292 | } |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | |
| 297 | void mei_host_client_init(struct work_struct *work) |
| 298 | { |
| 299 | struct mei_device *dev = container_of(work, |
| 300 | struct mei_device, init_work); |
| 301 | struct mei_client_properties *client_props; |
| 302 | int i; |
| 303 | |
| 304 | mutex_lock(&dev->device_lock); |
| 305 | |
| 306 | bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX); |
| 307 | dev->open_handle_count = 0; |
| 308 | |
| 309 | /* |
| 310 | * Reserving the first three client IDs |
| 311 | * 0: Reserved for MEI Bus Message communications |
| 312 | * 1: Reserved for Watchdog |
| 313 | * 2: Reserved for AMTHI |
| 314 | */ |
| 315 | bitmap_set(dev->host_clients_map, 0, 3); |
| 316 | |
| 317 | for (i = 0; i < dev->me_clients_num; i++) { |
| 318 | client_props = &dev->me_clients[i].props; |
| 319 | |
| 320 | if (!uuid_le_cmp(client_props->protocol_name, mei_amthi_guid)) |
| 321 | mei_amthif_host_init(dev); |
| 322 | else if (!uuid_le_cmp(client_props->protocol_name, mei_wd_guid)) |
| 323 | mei_wd_host_init(dev); |
| 324 | } |
| 325 | |
| 326 | dev->dev_state = MEI_DEV_ENABLED; |
| 327 | |
| 328 | mutex_unlock(&dev->device_lock); |
| 329 | } |
| 330 | |
| 331 | |
| 332 | /** |
| 333 | * mei_disconnect_host_client - sends disconnect message to fw from host client. |
| 334 | * |
| 335 | * @dev: the device structure |
| 336 | * @cl: private data of the file object |
| 337 | * |
| 338 | * Locking: called under "dev->device_lock" lock |
| 339 | * |
| 340 | * returns 0 on success, <0 on failure. |
| 341 | */ |
| 342 | int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl) |
| 343 | { |
| 344 | struct mei_cl_cb *cb; |
| 345 | int rets, err; |
| 346 | |
| 347 | if (!dev || !cl) |
| 348 | return -ENODEV; |
| 349 | |
| 350 | if (cl->state != MEI_FILE_DISCONNECTING) |
| 351 | return 0; |
| 352 | |
| 353 | cb = mei_io_cb_init(cl, NULL); |
| 354 | if (!cb) |
| 355 | return -ENOMEM; |
| 356 | |
| 357 | cb->fop_type = MEI_FOP_CLOSE; |
| 358 | if (dev->mei_host_buffer_is_empty) { |
| 359 | dev->mei_host_buffer_is_empty = false; |
| 360 | if (mei_hbm_cl_disconnect_req(dev, cl)) { |
| 361 | rets = -ENODEV; |
| 362 | dev_err(&dev->pdev->dev, "failed to disconnect.\n"); |
| 363 | goto free; |
| 364 | } |
| 365 | mdelay(10); /* Wait for hardware disconnection ready */ |
| 366 | list_add_tail(&cb->list, &dev->ctrl_rd_list.list); |
| 367 | } else { |
| 368 | dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n"); |
| 369 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
| 370 | |
| 371 | } |
| 372 | mutex_unlock(&dev->device_lock); |
| 373 | |
| 374 | err = wait_event_timeout(dev->wait_recvd_msg, |
| 375 | MEI_FILE_DISCONNECTED == cl->state, |
| 376 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); |
| 377 | |
| 378 | mutex_lock(&dev->device_lock); |
| 379 | if (MEI_FILE_DISCONNECTED == cl->state) { |
| 380 | rets = 0; |
| 381 | dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n"); |
| 382 | } else { |
| 383 | rets = -ENODEV; |
| 384 | if (MEI_FILE_DISCONNECTED != cl->state) |
| 385 | dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n"); |
| 386 | |
| 387 | if (err) |
| 388 | dev_dbg(&dev->pdev->dev, |
| 389 | "wait failed disconnect err=%08x\n", |
| 390 | err); |
| 391 | |
| 392 | dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n"); |
| 393 | } |
| 394 | |
| 395 | mei_io_list_flush(&dev->ctrl_rd_list, cl); |
| 396 | mei_io_list_flush(&dev->ctrl_wr_list, cl); |
| 397 | free: |
| 398 | mei_io_cb_free(cb); |
| 399 | return rets; |
| 400 | } |
| 401 | |
| 402 | |
| 403 | /** |
| 404 | * mei_other_client_is_connecting - checks if other |
| 405 | * client with the same client id is connected. |
| 406 | * |
| 407 | * @dev: the device structure |
| 408 | * @cl: private data of the file object |
| 409 | * |
| 410 | * returns 1 if other client is connected, 0 - otherwise. |
| 411 | */ |
| 412 | int mei_other_client_is_connecting(struct mei_device *dev, |
| 413 | struct mei_cl *cl) |
| 414 | { |
| 415 | struct mei_cl *cl_pos = NULL; |
| 416 | struct mei_cl *cl_next = NULL; |
| 417 | |
| 418 | list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) { |
| 419 | if ((cl_pos->state == MEI_FILE_CONNECTING) && |
| 420 | (cl_pos != cl) && |
| 421 | cl->me_client_id == cl_pos->me_client_id) |
| 422 | return 1; |
| 423 | |
| 424 | } |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | /** |
| 429 | * mei_flow_ctrl_creds - checks flow_control credentials. |
| 430 | * |
| 431 | * @dev: the device structure |
| 432 | * @cl: private data of the file object |
| 433 | * |
| 434 | * returns 1 if mei_flow_ctrl_creds >0, 0 - otherwise. |
| 435 | * -ENOENT if mei_cl is not present |
| 436 | * -EINVAL if single_recv_buf == 0 |
| 437 | */ |
| 438 | int mei_flow_ctrl_creds(struct mei_device *dev, struct mei_cl *cl) |
| 439 | { |
| 440 | int i; |
| 441 | |
| 442 | if (!dev->me_clients_num) |
| 443 | return 0; |
| 444 | |
| 445 | if (cl->mei_flow_ctrl_creds > 0) |
| 446 | return 1; |
| 447 | |
| 448 | for (i = 0; i < dev->me_clients_num; i++) { |
| 449 | struct mei_me_client *me_cl = &dev->me_clients[i]; |
| 450 | if (me_cl->client_id == cl->me_client_id) { |
| 451 | if (me_cl->mei_flow_ctrl_creds) { |
| 452 | if (WARN_ON(me_cl->props.single_recv_buf == 0)) |
| 453 | return -EINVAL; |
| 454 | return 1; |
| 455 | } else { |
| 456 | return 0; |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | return -ENOENT; |
| 461 | } |
| 462 | |
| 463 | /** |
| 464 | * mei_flow_ctrl_reduce - reduces flow_control. |
| 465 | * |
| 466 | * @dev: the device structure |
| 467 | * @cl: private data of the file object |
| 468 | * @returns |
| 469 | * 0 on success |
| 470 | * -ENOENT when me client is not found |
| 471 | * -EINVAL when ctrl credits are <= 0 |
| 472 | */ |
| 473 | int mei_flow_ctrl_reduce(struct mei_device *dev, struct mei_cl *cl) |
| 474 | { |
| 475 | int i; |
| 476 | |
| 477 | if (!dev->me_clients_num) |
| 478 | return -ENOENT; |
| 479 | |
| 480 | for (i = 0; i < dev->me_clients_num; i++) { |
| 481 | struct mei_me_client *me_cl = &dev->me_clients[i]; |
| 482 | if (me_cl->client_id == cl->me_client_id) { |
| 483 | if (me_cl->props.single_recv_buf != 0) { |
| 484 | if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0)) |
| 485 | return -EINVAL; |
| 486 | dev->me_clients[i].mei_flow_ctrl_creds--; |
| 487 | } else { |
| 488 | if (WARN_ON(cl->mei_flow_ctrl_creds <= 0)) |
| 489 | return -EINVAL; |
| 490 | cl->mei_flow_ctrl_creds--; |
| 491 | } |
| 492 | return 0; |
| 493 | } |
| 494 | } |
| 495 | return -ENOENT; |
| 496 | } |
| 497 | |
| 498 | |
| 499 | |
| 500 | /** |
| 501 | * mei_ioctl_connect_client - the connect to fw client IOCTL function |
| 502 | * |
| 503 | * @dev: the device structure |
| 504 | * @data: IOCTL connect data, input and output parameters |
| 505 | * @file: private data of the file object |
| 506 | * |
| 507 | * Locking: called under "dev->device_lock" lock |
| 508 | * |
| 509 | * returns 0 on success, <0 on failure. |
| 510 | */ |
| 511 | int mei_ioctl_connect_client(struct file *file, |
| 512 | struct mei_connect_client_data *data) |
| 513 | { |
| 514 | struct mei_device *dev; |
| 515 | struct mei_cl_cb *cb; |
| 516 | struct mei_client *client; |
| 517 | struct mei_cl *cl; |
| 518 | long timeout = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT); |
| 519 | int i; |
| 520 | int err; |
| 521 | int rets; |
| 522 | |
| 523 | cl = file->private_data; |
| 524 | if (WARN_ON(!cl || !cl->dev)) |
| 525 | return -ENODEV; |
| 526 | |
| 527 | dev = cl->dev; |
| 528 | |
| 529 | dev_dbg(&dev->pdev->dev, "mei_ioctl_connect_client() Entry\n"); |
| 530 | |
| 531 | /* buffered ioctl cb */ |
| 532 | cb = mei_io_cb_init(cl, file); |
| 533 | if (!cb) { |
| 534 | rets = -ENOMEM; |
| 535 | goto end; |
| 536 | } |
| 537 | |
| 538 | cb->fop_type = MEI_FOP_IOCTL; |
| 539 | |
| 540 | if (dev->dev_state != MEI_DEV_ENABLED) { |
| 541 | rets = -ENODEV; |
| 542 | goto end; |
| 543 | } |
| 544 | if (cl->state != MEI_FILE_INITIALIZING && |
| 545 | cl->state != MEI_FILE_DISCONNECTED) { |
| 546 | rets = -EBUSY; |
| 547 | goto end; |
| 548 | } |
| 549 | |
| 550 | /* find ME client we're trying to connect to */ |
| 551 | i = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
| 552 | if (i >= 0 && !dev->me_clients[i].props.fixed_address) { |
| 553 | cl->me_client_id = dev->me_clients[i].client_id; |
| 554 | cl->state = MEI_FILE_CONNECTING; |
| 555 | } |
| 556 | |
| 557 | dev_dbg(&dev->pdev->dev, "Connect to FW Client ID = %d\n", |
| 558 | cl->me_client_id); |
| 559 | dev_dbg(&dev->pdev->dev, "FW Client - Protocol Version = %d\n", |
| 560 | dev->me_clients[i].props.protocol_version); |
| 561 | dev_dbg(&dev->pdev->dev, "FW Client - Max Msg Len = %d\n", |
| 562 | dev->me_clients[i].props.max_msg_length); |
| 563 | |
| 564 | /* if we're connecting to amthi client then we will use the |
| 565 | * existing connection |
| 566 | */ |
| 567 | if (uuid_le_cmp(data->in_client_uuid, mei_amthi_guid) == 0) { |
| 568 | dev_dbg(&dev->pdev->dev, "FW Client is amthi\n"); |
| 569 | if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) { |
| 570 | rets = -ENODEV; |
| 571 | goto end; |
| 572 | } |
| 573 | clear_bit(cl->host_client_id, dev->host_clients_map); |
| 574 | mei_me_cl_unlink(dev, cl); |
| 575 | |
| 576 | kfree(cl); |
| 577 | cl = NULL; |
| 578 | file->private_data = &dev->iamthif_cl; |
| 579 | |
| 580 | client = &data->out_client_properties; |
| 581 | client->max_msg_length = |
| 582 | dev->me_clients[i].props.max_msg_length; |
| 583 | client->protocol_version = |
| 584 | dev->me_clients[i].props.protocol_version; |
| 585 | rets = dev->iamthif_cl.status; |
| 586 | |
| 587 | goto end; |
| 588 | } |
| 589 | |
| 590 | if (cl->state != MEI_FILE_CONNECTING) { |
| 591 | rets = -ENODEV; |
| 592 | goto end; |
| 593 | } |
| 594 | |
| 595 | |
| 596 | /* prepare the output buffer */ |
| 597 | client = &data->out_client_properties; |
| 598 | client->max_msg_length = dev->me_clients[i].props.max_msg_length; |
| 599 | client->protocol_version = dev->me_clients[i].props.protocol_version; |
| 600 | dev_dbg(&dev->pdev->dev, "Can connect?\n"); |
| 601 | if (dev->mei_host_buffer_is_empty |
| 602 | && !mei_other_client_is_connecting(dev, cl)) { |
| 603 | dev_dbg(&dev->pdev->dev, "Sending Connect Message\n"); |
| 604 | dev->mei_host_buffer_is_empty = false; |
| 605 | if (mei_hbm_cl_connect_req(dev, cl)) { |
| 606 | dev_dbg(&dev->pdev->dev, "Sending connect message - failed\n"); |
| 607 | rets = -ENODEV; |
| 608 | goto end; |
| 609 | } else { |
| 610 | dev_dbg(&dev->pdev->dev, "Sending connect message - succeeded\n"); |
| 611 | cl->timer_count = MEI_CONNECT_TIMEOUT; |
| 612 | list_add_tail(&cb->list, &dev->ctrl_rd_list.list); |
| 613 | } |
| 614 | |
| 615 | |
| 616 | } else { |
| 617 | dev_dbg(&dev->pdev->dev, "Queuing the connect request due to device busy\n"); |
| 618 | dev_dbg(&dev->pdev->dev, "add connect cb to control write list.\n"); |
| 619 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
| 620 | } |
| 621 | mutex_unlock(&dev->device_lock); |
| 622 | err = wait_event_timeout(dev->wait_recvd_msg, |
| 623 | (MEI_FILE_CONNECTED == cl->state || |
| 624 | MEI_FILE_DISCONNECTED == cl->state), timeout); |
| 625 | |
| 626 | mutex_lock(&dev->device_lock); |
| 627 | if (MEI_FILE_CONNECTED == cl->state) { |
| 628 | dev_dbg(&dev->pdev->dev, "successfully connected to FW client.\n"); |
| 629 | rets = cl->status; |
| 630 | goto end; |
| 631 | } else { |
| 632 | dev_dbg(&dev->pdev->dev, "failed to connect to FW client.cl->state = %d.\n", |
| 633 | cl->state); |
| 634 | if (!err) { |
| 635 | dev_dbg(&dev->pdev->dev, |
| 636 | "wait_event_interruptible_timeout failed on client" |
| 637 | " connect message fw response message.\n"); |
| 638 | } |
| 639 | rets = -EFAULT; |
| 640 | |
| 641 | mei_io_list_flush(&dev->ctrl_rd_list, cl); |
| 642 | mei_io_list_flush(&dev->ctrl_wr_list, cl); |
| 643 | goto end; |
| 644 | } |
| 645 | rets = 0; |
| 646 | end: |
| 647 | dev_dbg(&dev->pdev->dev, "free connect cb memory."); |
| 648 | mei_io_cb_free(cb); |
| 649 | return rets; |
| 650 | } |
| 651 | |
| 652 | /** |
| 653 | * mei_start_read - the start read client message function. |
| 654 | * |
| 655 | * @dev: the device structure |
| 656 | * @if_num: minor number |
| 657 | * @cl: private data of the file object |
| 658 | * |
| 659 | * returns 0 on success, <0 on failure. |
| 660 | */ |
| 661 | int mei_start_read(struct mei_device *dev, struct mei_cl *cl) |
| 662 | { |
| 663 | struct mei_cl_cb *cb; |
| 664 | int rets; |
| 665 | int i; |
| 666 | |
| 667 | if (cl->state != MEI_FILE_CONNECTED) |
| 668 | return -ENODEV; |
| 669 | |
| 670 | if (dev->dev_state != MEI_DEV_ENABLED) |
| 671 | return -ENODEV; |
| 672 | |
| 673 | if (cl->read_pending || cl->read_cb) { |
| 674 | dev_dbg(&dev->pdev->dev, "read is pending.\n"); |
| 675 | return -EBUSY; |
| 676 | } |
| 677 | i = mei_me_cl_by_id(dev, cl->me_client_id); |
| 678 | if (i < 0) { |
| 679 | dev_err(&dev->pdev->dev, "no such me client %d\n", |
| 680 | cl->me_client_id); |
| 681 | return -ENODEV; |
| 682 | } |
| 683 | |
| 684 | cb = mei_io_cb_init(cl, NULL); |
| 685 | if (!cb) |
| 686 | return -ENOMEM; |
| 687 | |
| 688 | rets = mei_io_cb_alloc_resp_buf(cb, |
| 689 | dev->me_clients[i].props.max_msg_length); |
| 690 | if (rets) |
| 691 | goto err; |
| 692 | |
| 693 | cb->fop_type = MEI_FOP_READ; |
| 694 | cl->read_cb = cb; |
| 695 | if (dev->mei_host_buffer_is_empty) { |
| 696 | dev->mei_host_buffer_is_empty = false; |
| 697 | if (mei_hbm_cl_flow_control_req(dev, cl)) { |
| 698 | rets = -ENODEV; |
| 699 | goto err; |
| 700 | } |
| 701 | list_add_tail(&cb->list, &dev->read_list.list); |
| 702 | } else { |
| 703 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
| 704 | } |
| 705 | return rets; |
| 706 | err: |
| 707 | mei_io_cb_free(cb); |
| 708 | return rets; |
| 709 | } |
| 710 | |