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