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 #ifndef _MEI_DEV_H_ 18 #define _MEI_DEV_H_ 19 20 #include <linux/types.h> 21 #include <linux/watchdog.h> 22 #include <linux/poll.h> 23 #include <linux/mei.h> 24 #include <linux/mei_cl_bus.h> 25 26 #include "hw.h" 27 #include "hw-me-regs.h" 28 #include "hbm.h" 29 30 /* 31 * watch dog definition 32 */ 33 #define MEI_WD_HDR_SIZE 4 34 #define MEI_WD_STOP_MSG_SIZE MEI_WD_HDR_SIZE 35 #define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16) 36 37 #define MEI_WD_DEFAULT_TIMEOUT 120 /* seconds */ 38 #define MEI_WD_MIN_TIMEOUT 120 /* seconds */ 39 #define MEI_WD_MAX_TIMEOUT 65535 /* seconds */ 40 41 #define MEI_WD_STOP_TIMEOUT 10 /* msecs */ 42 43 #define MEI_WD_STATE_INDEPENDENCE_MSG_SENT (1 << 0) 44 45 #define MEI_RD_MSG_BUF_SIZE (128 * sizeof(u32)) 46 47 48 /* 49 * AMTHI Client UUID 50 */ 51 extern const uuid_le mei_amthif_guid; 52 53 /* 54 * Watchdog Client UUID 55 */ 56 extern const uuid_le mei_wd_guid; 57 58 /* 59 * Number of Maximum MEI Clients 60 */ 61 #define MEI_CLIENTS_MAX 256 62 63 /* 64 * maximum number of consecutive resets 65 */ 66 #define MEI_MAX_CONSEC_RESET 3 67 68 /* 69 * Number of File descriptors/handles 70 * that can be opened to the driver. 71 * 72 * Limit to 255: 256 Total Clients 73 * minus internal client for MEI Bus Messages 74 */ 75 #define MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1) 76 77 /* 78 * Internal Clients Number 79 */ 80 #define MEI_HOST_CLIENT_ID_ANY (-1) 81 #define MEI_HBM_HOST_CLIENT_ID 0 /* not used, just for documentation */ 82 #define MEI_WD_HOST_CLIENT_ID 1 83 #define MEI_IAMTHIF_HOST_CLIENT_ID 2 84 85 86 /* File state */ 87 enum file_state { 88 MEI_FILE_INITIALIZING = 0, 89 MEI_FILE_CONNECTING, 90 MEI_FILE_CONNECTED, 91 MEI_FILE_DISCONNECTING, 92 MEI_FILE_DISCONNECTED 93 }; 94 95 /* MEI device states */ 96 enum mei_dev_state { 97 MEI_DEV_INITIALIZING = 0, 98 MEI_DEV_INIT_CLIENTS, 99 MEI_DEV_ENABLED, 100 MEI_DEV_RESETTING, 101 MEI_DEV_DISABLED, 102 MEI_DEV_POWER_DOWN, 103 MEI_DEV_POWER_UP 104 }; 105 106 const char *mei_dev_state_str(int state); 107 108 enum iamthif_states { 109 MEI_IAMTHIF_IDLE, 110 MEI_IAMTHIF_WRITING, 111 MEI_IAMTHIF_FLOW_CONTROL, 112 MEI_IAMTHIF_READING, 113 MEI_IAMTHIF_READ_COMPLETE 114 }; 115 116 enum mei_file_transaction_states { 117 MEI_IDLE, 118 MEI_WRITING, 119 MEI_WRITE_COMPLETE, 120 MEI_FLOW_CONTROL, 121 MEI_READING, 122 MEI_READ_COMPLETE 123 }; 124 125 enum mei_wd_states { 126 MEI_WD_IDLE, 127 MEI_WD_RUNNING, 128 MEI_WD_STOPPING, 129 }; 130 131 /** 132 * enum mei_cb_file_ops - file operation associated with the callback 133 * @MEI_FOP_READ - read 134 * @MEI_FOP_WRITE - write 135 * @MEI_FOP_IOCTL - ioctl 136 * @MEI_FOP_OPEN - open 137 * @MEI_FOP_CLOSE - close 138 */ 139 enum mei_cb_file_ops { 140 MEI_FOP_READ = 0, 141 MEI_FOP_WRITE, 142 MEI_FOP_IOCTL, 143 MEI_FOP_OPEN, 144 MEI_FOP_CLOSE 145 }; 146 147 /* 148 * Intel MEI message data struct 149 */ 150 struct mei_msg_data { 151 u32 size; 152 unsigned char *data; 153 }; 154 155 /** 156 * struct mei_me_client - representation of me (fw) client 157 * 158 * @props - client properties 159 * @client_id - me client id 160 * @mei_flow_ctrl_creds - flow control credits 161 */ 162 struct mei_me_client { 163 struct mei_client_properties props; 164 u8 client_id; 165 u8 mei_flow_ctrl_creds; 166 }; 167 168 169 struct mei_cl; 170 171 /** 172 * struct mei_cl_cb - file operation callback structure 173 * 174 * @cl - file client who is running this operation 175 * @fop_type - file operation type 176 */ 177 struct mei_cl_cb { 178 struct list_head list; 179 struct mei_cl *cl; 180 enum mei_cb_file_ops fop_type; 181 struct mei_msg_data request_buffer; 182 struct mei_msg_data response_buffer; 183 unsigned long buf_idx; 184 unsigned long read_time; 185 struct file *file_object; 186 u32 internal:1; 187 }; 188 189 /* MEI client instance carried as file->private_data*/ 190 struct mei_cl { 191 struct list_head link; 192 struct mei_device *dev; 193 enum file_state state; 194 wait_queue_head_t tx_wait; 195 wait_queue_head_t rx_wait; 196 wait_queue_head_t wait; 197 int status; 198 /* ID of client connected */ 199 u8 host_client_id; 200 u8 me_client_id; 201 u8 mei_flow_ctrl_creds; 202 u8 timer_count; 203 enum mei_file_transaction_states reading_state; 204 enum mei_file_transaction_states writing_state; 205 struct mei_cl_cb *read_cb; 206 207 /* MEI CL bus data */ 208 struct mei_cl_device *device; 209 struct list_head device_link; 210 uuid_le device_uuid; 211 }; 212 213 /** struct mei_hw_ops 214 * 215 * @host_is_ready - query for host readiness 216 217 * @hw_is_ready - query if hw is ready 218 * @hw_reset - reset hw 219 * @hw_start - start hw after reset 220 * @hw_config - configure hw 221 222 * @intr_clear - clear pending interrupts 223 * @intr_enable - enable interrupts 224 * @intr_disable - disable interrupts 225 226 * @hbuf_free_slots - query for write buffer empty slots 227 * @hbuf_is_ready - query if write buffer is empty 228 * @hbuf_max_len - query for write buffer max len 229 230 * @write - write a message to FW 231 232 * @rdbuf_full_slots - query how many slots are filled 233 234 * @read_hdr - get first 4 bytes (header) 235 * @read - read a buffer from the FW 236 */ 237 struct mei_hw_ops { 238 239 bool (*host_is_ready) (struct mei_device *dev); 240 241 bool (*hw_is_ready) (struct mei_device *dev); 242 int (*hw_reset) (struct mei_device *dev, bool enable); 243 int (*hw_start) (struct mei_device *dev); 244 void (*hw_config) (struct mei_device *dev); 245 246 void (*intr_clear) (struct mei_device *dev); 247 void (*intr_enable) (struct mei_device *dev); 248 void (*intr_disable) (struct mei_device *dev); 249 250 int (*hbuf_free_slots) (struct mei_device *dev); 251 bool (*hbuf_is_ready) (struct mei_device *dev); 252 size_t (*hbuf_max_len) (const struct mei_device *dev); 253 254 int (*write)(struct mei_device *dev, 255 struct mei_msg_hdr *hdr, 256 unsigned char *buf); 257 258 int (*rdbuf_full_slots)(struct mei_device *dev); 259 260 u32 (*read_hdr)(const struct mei_device *dev); 261 int (*read) (struct mei_device *dev, 262 unsigned char *buf, unsigned long len); 263 }; 264 265 /* MEI bus API*/ 266 267 /** 268 * struct mei_cl_ops - MEI CL device ops 269 * This structure allows ME host clients to implement technology 270 * specific operations. 271 * 272 * @enable: Enable an MEI CL device. Some devices require specific 273 * HECI commands to initialize completely. 274 * @disable: Disable an MEI CL device. 275 * @send: Tx hook for the device. This allows ME host clients to trap 276 * the device driver buffers before actually physically 277 * pushing it to the ME. 278 * @recv: Rx hook for the device. This allows ME host clients to trap the 279 * ME buffers before forwarding them to the device driver. 280 */ 281 struct mei_cl_ops { 282 int (*enable)(struct mei_cl_device *device); 283 int (*disable)(struct mei_cl_device *device); 284 int (*send)(struct mei_cl_device *device, u8 *buf, size_t length); 285 int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length); 286 }; 287 288 struct mei_cl_device *mei_cl_add_device(struct mei_device *dev, 289 uuid_le uuid, char *name, 290 struct mei_cl_ops *ops); 291 void mei_cl_remove_device(struct mei_cl_device *device); 292 293 int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length); 294 int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length); 295 int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length); 296 void mei_cl_bus_rx_event(struct mei_cl *cl); 297 int mei_cl_bus_init(void); 298 void mei_cl_bus_exit(void); 299 300 301 /** 302 * struct mei_cl_device - MEI device handle 303 * An mei_cl_device pointer is returned from mei_add_device() 304 * and links MEI bus clients to their actual ME host client pointer. 305 * Drivers for MEI devices will get an mei_cl_device pointer 306 * when being probed and shall use it for doing ME bus I/O. 307 * 308 * @dev: linux driver model device pointer 309 * @uuid: me client uuid 310 * @cl: mei client 311 * @ops: ME transport ops 312 * @event_cb: Drivers register this callback to get asynchronous ME 313 * events (e.g. Rx buffer pending) notifications. 314 * @events: Events bitmask sent to the driver. 315 * @priv_data: client private data 316 */ 317 struct mei_cl_device { 318 struct device dev; 319 320 struct mei_cl *cl; 321 322 const struct mei_cl_ops *ops; 323 324 struct work_struct event_work; 325 mei_cl_event_cb_t event_cb; 326 void *event_context; 327 unsigned long events; 328 329 void *priv_data; 330 }; 331 332 /** 333 * struct mei_device - MEI private device struct 334 335 * @reset_count - limits the number of consecutive resets 336 * @hbm_state - state of host bus message protocol 337 * @mem_addr - mem mapped base register address 338 339 * @hbuf_depth - depth of hardware host/write buffer is slots 340 * @hbuf_is_ready - query if the host host/write buffer is ready 341 * @wr_msg - the buffer for hbm control messages 342 * @wr_ext_msg - the buffer for hbm control responses (set in read cycle) 343 */ 344 struct mei_device { 345 struct pci_dev *pdev; /* pointer to pci device struct */ 346 /* 347 * lists of queues 348 */ 349 /* array of pointers to aio lists */ 350 struct mei_cl_cb read_list; /* driver read queue */ 351 struct mei_cl_cb write_list; /* driver write queue */ 352 struct mei_cl_cb write_waiting_list; /* write waiting queue */ 353 struct mei_cl_cb ctrl_wr_list; /* managed write IOCTL list */ 354 struct mei_cl_cb ctrl_rd_list; /* managed read IOCTL list */ 355 356 /* 357 * list of files 358 */ 359 struct list_head file_list; 360 long open_handle_count; 361 362 /* 363 * lock for the device 364 */ 365 struct mutex device_lock; /* device lock */ 366 struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */ 367 368 bool recvd_hw_ready; 369 /* 370 * waiting queue for receive message from FW 371 */ 372 wait_queue_head_t wait_hw_ready; 373 wait_queue_head_t wait_recvd_msg; 374 wait_queue_head_t wait_stop_wd; 375 376 /* 377 * mei device states 378 */ 379 unsigned long reset_count; 380 enum mei_dev_state dev_state; 381 enum mei_hbm_state hbm_state; 382 u16 init_clients_timer; 383 384 unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* control messages */ 385 u32 rd_msg_hdr; 386 387 /* write buffer */ 388 u8 hbuf_depth; 389 bool hbuf_is_ready; 390 391 /* used for control messages */ 392 struct { 393 struct mei_msg_hdr hdr; 394 unsigned char data[128]; 395 } wr_msg; 396 397 struct { 398 struct mei_msg_hdr hdr; 399 unsigned char data[4]; /* All HBM messages are 4 bytes */ 400 } wr_ext_msg; /* for control responses */ 401 402 struct hbm_version version; 403 404 struct mei_me_client *me_clients; /* Note: memory has to be allocated */ 405 DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX); 406 DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX); 407 unsigned long me_clients_num; 408 unsigned long me_client_presentation_num; 409 unsigned long me_client_index; 410 411 struct mei_cl wd_cl; 412 enum mei_wd_states wd_state; 413 bool wd_pending; 414 u16 wd_timeout; 415 unsigned char wd_data[MEI_WD_START_MSG_SIZE]; 416 417 418 /* amthif list for cmd waiting */ 419 struct mei_cl_cb amthif_cmd_list; 420 /* driver managed amthif list for reading completed amthif cmd data */ 421 struct mei_cl_cb amthif_rd_complete_list; 422 struct file *iamthif_file_object; 423 struct mei_cl iamthif_cl; 424 struct mei_cl_cb *iamthif_current_cb; 425 long iamthif_open_count; 426 int iamthif_mtu; 427 unsigned long iamthif_timer; 428 u32 iamthif_stall_timer; 429 unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */ 430 u32 iamthif_msg_buf_size; 431 u32 iamthif_msg_buf_index; 432 enum iamthif_states iamthif_state; 433 bool iamthif_flow_control_pending; 434 bool iamthif_ioctl; 435 bool iamthif_canceled; 436 437 struct work_struct init_work; 438 struct work_struct reset_work; 439 440 /* List of bus devices */ 441 struct list_head device_list; 442 443 #if IS_ENABLED(CONFIG_DEBUG_FS) 444 struct dentry *dbgfs_dir; 445 #endif /* CONFIG_DEBUG_FS */ 446 447 448 const struct mei_hw_ops *ops; 449 char hw[0] __aligned(sizeof(void *)); 450 }; 451 452 static inline unsigned long mei_secs_to_jiffies(unsigned long sec) 453 { 454 return msecs_to_jiffies(sec * MSEC_PER_SEC); 455 } 456 457 /** 458 * mei_data2slots - get slots - number of (dwords) from a message length 459 * + size of the mei header 460 * @length - size of the messages in bytes 461 * returns - number of slots 462 */ 463 static inline u32 mei_data2slots(size_t length) 464 { 465 return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4); 466 } 467 468 /** 469 * mei_slots2data- get data in slots - bytes from slots 470 * @slots - number of available slots 471 * returns - number of bytes in slots 472 */ 473 static inline u32 mei_slots2data(int slots) 474 { 475 return slots * 4; 476 } 477 478 /* 479 * mei init function prototypes 480 */ 481 void mei_device_init(struct mei_device *dev); 482 int mei_reset(struct mei_device *dev); 483 int mei_start(struct mei_device *dev); 484 int mei_restart(struct mei_device *dev); 485 void mei_stop(struct mei_device *dev); 486 void mei_cancel_work(struct mei_device *dev); 487 488 /* 489 * MEI interrupt functions prototype 490 */ 491 492 void mei_timer(struct work_struct *work); 493 int mei_irq_read_handler(struct mei_device *dev, 494 struct mei_cl_cb *cmpl_list, s32 *slots); 495 496 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list); 497 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list); 498 499 /* 500 * AMTHIF - AMT Host Interface Functions 501 */ 502 void mei_amthif_reset_params(struct mei_device *dev); 503 504 int mei_amthif_host_init(struct mei_device *dev); 505 506 int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb); 507 508 int mei_amthif_read(struct mei_device *dev, struct file *file, 509 char __user *ubuf, size_t length, loff_t *offset); 510 511 unsigned int mei_amthif_poll(struct mei_device *dev, 512 struct file *file, poll_table *wait); 513 514 int mei_amthif_release(struct mei_device *dev, struct file *file); 515 516 struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev, 517 struct file *file); 518 519 void mei_amthif_run_next_cmd(struct mei_device *dev); 520 521 int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb, 522 s32 *slots, struct mei_cl_cb *cmpl_list); 523 524 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb); 525 int mei_amthif_irq_read_msg(struct mei_device *dev, 526 struct mei_msg_hdr *mei_hdr, 527 struct mei_cl_cb *complete_list); 528 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots); 529 530 /* 531 * NFC functions 532 */ 533 int mei_nfc_host_init(struct mei_device *dev); 534 void mei_nfc_host_exit(struct mei_device *dev); 535 536 /* 537 * NFC Client UUID 538 */ 539 extern const uuid_le mei_nfc_guid; 540 541 int mei_wd_send(struct mei_device *dev); 542 int mei_wd_stop(struct mei_device *dev); 543 int mei_wd_host_init(struct mei_device *dev); 544 /* 545 * mei_watchdog_register - Registering watchdog interface 546 * once we got connection to the WD Client 547 * @dev - mei device 548 */ 549 void mei_watchdog_register(struct mei_device *dev); 550 /* 551 * mei_watchdog_unregister - Unregistering watchdog interface 552 * @dev - mei device 553 */ 554 void mei_watchdog_unregister(struct mei_device *dev); 555 556 /* 557 * Register Access Function 558 */ 559 560 static inline void mei_hw_config(struct mei_device *dev) 561 { 562 dev->ops->hw_config(dev); 563 } 564 static inline int mei_hw_reset(struct mei_device *dev, bool enable) 565 { 566 return dev->ops->hw_reset(dev, enable); 567 } 568 569 static inline int mei_hw_start(struct mei_device *dev) 570 { 571 return dev->ops->hw_start(dev); 572 } 573 574 static inline void mei_clear_interrupts(struct mei_device *dev) 575 { 576 dev->ops->intr_clear(dev); 577 } 578 579 static inline void mei_enable_interrupts(struct mei_device *dev) 580 { 581 dev->ops->intr_enable(dev); 582 } 583 584 static inline void mei_disable_interrupts(struct mei_device *dev) 585 { 586 dev->ops->intr_disable(dev); 587 } 588 589 static inline bool mei_host_is_ready(struct mei_device *dev) 590 { 591 return dev->ops->host_is_ready(dev); 592 } 593 static inline bool mei_hw_is_ready(struct mei_device *dev) 594 { 595 return dev->ops->hw_is_ready(dev); 596 } 597 598 static inline bool mei_hbuf_is_ready(struct mei_device *dev) 599 { 600 return dev->ops->hbuf_is_ready(dev); 601 } 602 603 static inline int mei_hbuf_empty_slots(struct mei_device *dev) 604 { 605 return dev->ops->hbuf_free_slots(dev); 606 } 607 608 static inline size_t mei_hbuf_max_len(const struct mei_device *dev) 609 { 610 return dev->ops->hbuf_max_len(dev); 611 } 612 613 static inline int mei_write_message(struct mei_device *dev, 614 struct mei_msg_hdr *hdr, 615 unsigned char *buf) 616 { 617 return dev->ops->write(dev, hdr, buf); 618 } 619 620 static inline u32 mei_read_hdr(const struct mei_device *dev) 621 { 622 return dev->ops->read_hdr(dev); 623 } 624 625 static inline void mei_read_slots(struct mei_device *dev, 626 unsigned char *buf, unsigned long len) 627 { 628 dev->ops->read(dev, buf, len); 629 } 630 631 static inline int mei_count_full_read_slots(struct mei_device *dev) 632 { 633 return dev->ops->rdbuf_full_slots(dev); 634 } 635 636 #if IS_ENABLED(CONFIG_DEBUG_FS) 637 int mei_dbgfs_register(struct mei_device *dev, const char *name); 638 void mei_dbgfs_deregister(struct mei_device *dev); 639 #else 640 static inline int mei_dbgfs_register(struct mei_device *dev, const char *name) 641 { 642 return 0; 643 } 644 static inline void mei_dbgfs_deregister(struct mei_device *dev) {} 645 #endif /* CONFIG_DEBUG_FS */ 646 647 int mei_register(struct mei_device *dev); 648 void mei_deregister(struct mei_device *dev); 649 650 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d internal=%1d comp=%1d" 651 #define MEI_HDR_PRM(hdr) \ 652 (hdr)->host_addr, (hdr)->me_addr, \ 653 (hdr)->length, (hdr)->internal, (hdr)->msg_complete 654 655 #endif 656