1 /* 2 * 3 * Intel Management Engine Interface (Intel MEI) Linux driver 4 * Copyright (c) 2003-2018, 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/cdev.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 "hbm.h" 28 29 #define MEI_SLOT_SIZE sizeof(u32) 30 #define MEI_RD_MSG_BUF_SIZE (128 * MEI_SLOT_SIZE) 31 32 /* 33 * Number of Maximum MEI Clients 34 */ 35 #define MEI_CLIENTS_MAX 256 36 37 /* 38 * maximum number of consecutive resets 39 */ 40 #define MEI_MAX_CONSEC_RESET 3 41 42 /* 43 * Number of File descriptors/handles 44 * that can be opened to the driver. 45 * 46 * Limit to 255: 256 Total Clients 47 * minus internal client for MEI Bus Messages 48 */ 49 #define MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1) 50 51 /* File state */ 52 enum file_state { 53 MEI_FILE_UNINITIALIZED = 0, 54 MEI_FILE_INITIALIZING, 55 MEI_FILE_CONNECTING, 56 MEI_FILE_CONNECTED, 57 MEI_FILE_DISCONNECTING, 58 MEI_FILE_DISCONNECT_REPLY, 59 MEI_FILE_DISCONNECT_REQUIRED, 60 MEI_FILE_DISCONNECTED, 61 }; 62 63 /* MEI device states */ 64 enum mei_dev_state { 65 MEI_DEV_INITIALIZING = 0, 66 MEI_DEV_INIT_CLIENTS, 67 MEI_DEV_ENABLED, 68 MEI_DEV_RESETTING, 69 MEI_DEV_DISABLED, 70 MEI_DEV_POWER_DOWN, 71 MEI_DEV_POWER_UP 72 }; 73 74 const char *mei_dev_state_str(int state); 75 76 enum mei_file_transaction_states { 77 MEI_IDLE, 78 MEI_WRITING, 79 MEI_WRITE_COMPLETE, 80 }; 81 82 /** 83 * enum mei_cb_file_ops - file operation associated with the callback 84 * @MEI_FOP_READ: read 85 * @MEI_FOP_WRITE: write 86 * @MEI_FOP_CONNECT: connect 87 * @MEI_FOP_DISCONNECT: disconnect 88 * @MEI_FOP_DISCONNECT_RSP: disconnect response 89 * @MEI_FOP_NOTIFY_START: start notification 90 * @MEI_FOP_NOTIFY_STOP: stop notification 91 */ 92 enum mei_cb_file_ops { 93 MEI_FOP_READ = 0, 94 MEI_FOP_WRITE, 95 MEI_FOP_CONNECT, 96 MEI_FOP_DISCONNECT, 97 MEI_FOP_DISCONNECT_RSP, 98 MEI_FOP_NOTIFY_START, 99 MEI_FOP_NOTIFY_STOP, 100 }; 101 102 /** 103 * enum mei_cl_io_mode - io mode between driver and fw 104 * 105 * @MEI_CL_IO_TX_BLOCKING: send is blocking 106 * @MEI_CL_IO_TX_INTERNAL: internal communication between driver and FW 107 * 108 * @MEI_CL_IO_RX_NONBLOCK: recv is non-blocking 109 */ 110 enum mei_cl_io_mode { 111 MEI_CL_IO_TX_BLOCKING = BIT(0), 112 MEI_CL_IO_TX_INTERNAL = BIT(1), 113 114 MEI_CL_IO_RX_NONBLOCK = BIT(2), 115 }; 116 117 /* 118 * Intel MEI message data struct 119 */ 120 struct mei_msg_data { 121 size_t size; 122 unsigned char *data; 123 }; 124 125 /* Maximum number of processed FW status registers */ 126 #define MEI_FW_STATUS_MAX 6 127 /* Minimal buffer for FW status string (8 bytes in dw + space or '\0') */ 128 #define MEI_FW_STATUS_STR_SZ (MEI_FW_STATUS_MAX * (8 + 1)) 129 130 131 /* 132 * struct mei_fw_status - storage of FW status data 133 * 134 * @count: number of actually available elements in array 135 * @status: FW status registers 136 */ 137 struct mei_fw_status { 138 int count; 139 u32 status[MEI_FW_STATUS_MAX]; 140 }; 141 142 /** 143 * struct mei_me_client - representation of me (fw) client 144 * 145 * @list: link in me client list 146 * @refcnt: struct reference count 147 * @props: client properties 148 * @client_id: me client id 149 * @tx_flow_ctrl_creds: flow control credits 150 * @connect_count: number connections to this client 151 * @bus_added: added to bus 152 */ 153 struct mei_me_client { 154 struct list_head list; 155 struct kref refcnt; 156 struct mei_client_properties props; 157 u8 client_id; 158 u8 tx_flow_ctrl_creds; 159 u8 connect_count; 160 u8 bus_added; 161 }; 162 163 164 struct mei_cl; 165 166 /** 167 * struct mei_cl_cb - file operation callback structure 168 * 169 * @list: link in callback queue 170 * @cl: file client who is running this operation 171 * @fop_type: file operation type 172 * @buf: buffer for data associated with the callback 173 * @buf_idx: last read index 174 * @fp: pointer to file structure 175 * @status: io status of the cb 176 * @internal: communication between driver and FW flag 177 * @blocking: transmission blocking mode 178 */ 179 struct mei_cl_cb { 180 struct list_head list; 181 struct mei_cl *cl; 182 enum mei_cb_file_ops fop_type; 183 struct mei_msg_data buf; 184 size_t buf_idx; 185 const struct file *fp; 186 int status; 187 u32 internal:1; 188 u32 blocking:1; 189 }; 190 191 /** 192 * struct mei_cl - me client host representation 193 * carried in file->private_data 194 * 195 * @link: link in the clients list 196 * @dev: mei parent device 197 * @state: file operation state 198 * @tx_wait: wait queue for tx completion 199 * @rx_wait: wait queue for rx completion 200 * @wait: wait queue for management operation 201 * @ev_wait: notification wait queue 202 * @ev_async: event async notification 203 * @status: connection status 204 * @me_cl: fw client connected 205 * @fp: file associated with client 206 * @host_client_id: host id 207 * @tx_flow_ctrl_creds: transmit flow credentials 208 * @rx_flow_ctrl_creds: receive flow credentials 209 * @timer_count: watchdog timer for operation completion 210 * @notify_en: notification - enabled/disabled 211 * @notify_ev: pending notification event 212 * @tx_cb_queued: number of tx callbacks in queue 213 * @writing_state: state of the tx 214 * @rd_pending: pending read credits 215 * @rd_completed: completed read 216 * 217 * @cldev: device on the mei client bus 218 */ 219 struct mei_cl { 220 struct list_head link; 221 struct mei_device *dev; 222 enum file_state state; 223 wait_queue_head_t tx_wait; 224 wait_queue_head_t rx_wait; 225 wait_queue_head_t wait; 226 wait_queue_head_t ev_wait; 227 struct fasync_struct *ev_async; 228 int status; 229 struct mei_me_client *me_cl; 230 const struct file *fp; 231 u8 host_client_id; 232 u8 tx_flow_ctrl_creds; 233 u8 rx_flow_ctrl_creds; 234 u8 timer_count; 235 u8 notify_en; 236 u8 notify_ev; 237 u8 tx_cb_queued; 238 enum mei_file_transaction_states writing_state; 239 struct list_head rd_pending; 240 struct list_head rd_completed; 241 242 struct mei_cl_device *cldev; 243 }; 244 245 #define MEI_TX_QUEUE_LIMIT_DEFAULT 50 246 #define MEI_TX_QUEUE_LIMIT_MAX 255 247 #define MEI_TX_QUEUE_LIMIT_MIN 30 248 249 /** 250 * struct mei_hw_ops - hw specific ops 251 * 252 * @host_is_ready : query for host readiness 253 * 254 * @hw_is_ready : query if hw is ready 255 * @hw_reset : reset hw 256 * @hw_start : start hw after reset 257 * @hw_config : configure hw 258 * 259 * @fw_status : get fw status registers 260 * @pg_state : power gating state of the device 261 * @pg_in_transition : is device now in pg transition 262 * @pg_is_enabled : is power gating enabled 263 * 264 * @intr_clear : clear pending interrupts 265 * @intr_enable : enable interrupts 266 * @intr_disable : disable interrupts 267 * @synchronize_irq : synchronize irqs 268 * 269 * @hbuf_free_slots : query for write buffer empty slots 270 * @hbuf_is_ready : query if write buffer is empty 271 * @hbuf_depth : query for write buffer depth 272 * 273 * @write : write a message to FW 274 * 275 * @rdbuf_full_slots : query how many slots are filled 276 * 277 * @read_hdr : get first 4 bytes (header) 278 * @read : read a buffer from the FW 279 */ 280 struct mei_hw_ops { 281 282 bool (*host_is_ready)(struct mei_device *dev); 283 284 bool (*hw_is_ready)(struct mei_device *dev); 285 int (*hw_reset)(struct mei_device *dev, bool enable); 286 int (*hw_start)(struct mei_device *dev); 287 void (*hw_config)(struct mei_device *dev); 288 289 int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts); 290 enum mei_pg_state (*pg_state)(struct mei_device *dev); 291 bool (*pg_in_transition)(struct mei_device *dev); 292 bool (*pg_is_enabled)(struct mei_device *dev); 293 294 void (*intr_clear)(struct mei_device *dev); 295 void (*intr_enable)(struct mei_device *dev); 296 void (*intr_disable)(struct mei_device *dev); 297 void (*synchronize_irq)(struct mei_device *dev); 298 299 int (*hbuf_free_slots)(struct mei_device *dev); 300 bool (*hbuf_is_ready)(struct mei_device *dev); 301 u32 (*hbuf_depth)(const struct mei_device *dev); 302 int (*write)(struct mei_device *dev, 303 const void *hdr, size_t hdr_len, 304 const void *data, size_t data_len); 305 306 int (*rdbuf_full_slots)(struct mei_device *dev); 307 308 u32 (*read_hdr)(const struct mei_device *dev); 309 int (*read)(struct mei_device *dev, 310 unsigned char *buf, unsigned long len); 311 }; 312 313 /* MEI bus API*/ 314 void mei_cl_bus_rescan_work(struct work_struct *work); 315 void mei_cl_bus_dev_fixup(struct mei_cl_device *dev); 316 ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, 317 unsigned int mode); 318 ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, 319 unsigned int mode, unsigned long timeout); 320 bool mei_cl_bus_rx_event(struct mei_cl *cl); 321 bool mei_cl_bus_notify_event(struct mei_cl *cl); 322 void mei_cl_bus_remove_devices(struct mei_device *bus); 323 int mei_cl_bus_init(void); 324 void mei_cl_bus_exit(void); 325 326 /** 327 * enum mei_pg_event - power gating transition events 328 * 329 * @MEI_PG_EVENT_IDLE: the driver is not in power gating transition 330 * @MEI_PG_EVENT_WAIT: the driver is waiting for a pg event to complete 331 * @MEI_PG_EVENT_RECEIVED: the driver received pg event 332 * @MEI_PG_EVENT_INTR_WAIT: the driver is waiting for a pg event interrupt 333 * @MEI_PG_EVENT_INTR_RECEIVED: the driver received pg event interrupt 334 */ 335 enum mei_pg_event { 336 MEI_PG_EVENT_IDLE, 337 MEI_PG_EVENT_WAIT, 338 MEI_PG_EVENT_RECEIVED, 339 MEI_PG_EVENT_INTR_WAIT, 340 MEI_PG_EVENT_INTR_RECEIVED, 341 }; 342 343 /** 344 * enum mei_pg_state - device internal power gating state 345 * 346 * @MEI_PG_OFF: device is not power gated - it is active 347 * @MEI_PG_ON: device is power gated - it is in lower power state 348 */ 349 enum mei_pg_state { 350 MEI_PG_OFF = 0, 351 MEI_PG_ON = 1, 352 }; 353 354 const char *mei_pg_state_str(enum mei_pg_state state); 355 356 /** 357 * struct mei_fw_version - MEI FW version struct 358 * 359 * @platform: platform identifier 360 * @major: major version field 361 * @minor: minor version field 362 * @buildno: build number version field 363 * @hotfix: hotfix number version field 364 */ 365 struct mei_fw_version { 366 u8 platform; 367 u8 major; 368 u16 minor; 369 u16 buildno; 370 u16 hotfix; 371 }; 372 373 #define MEI_MAX_FW_VER_BLOCKS 3 374 375 /** 376 * struct mei_device - MEI private device struct 377 * 378 * @dev : device on a bus 379 * @cdev : character device 380 * @minor : minor number allocated for device 381 * 382 * @write_list : write pending list 383 * @write_waiting_list : write completion list 384 * @ctrl_wr_list : pending control write list 385 * @ctrl_rd_list : pending control read list 386 * @tx_queue_limit: tx queues per client linit 387 * 388 * @file_list : list of opened handles 389 * @open_handle_count: number of opened handles 390 * 391 * @device_lock : big device lock 392 * @timer_work : MEI timer delayed work (timeouts) 393 * 394 * @recvd_hw_ready : hw ready message received flag 395 * 396 * @wait_hw_ready : wait queue for receive HW ready message form FW 397 * @wait_pg : wait queue for receive PG message from FW 398 * @wait_hbm_start : wait queue for receive HBM start message from FW 399 * 400 * @reset_count : number of consecutive resets 401 * @dev_state : device state 402 * @hbm_state : state of host bus message protocol 403 * @init_clients_timer : HBM init handshake timeout 404 * 405 * @pg_event : power gating event 406 * @pg_domain : runtime PM domain 407 * 408 * @rd_msg_buf : control messages buffer 409 * @rd_msg_hdr : read message header storage 410 * 411 * @hbuf_is_ready : query if the host host/write buffer is ready 412 * 413 * @version : HBM protocol version in use 414 * @hbm_f_pg_supported : hbm feature pgi protocol 415 * @hbm_f_dc_supported : hbm feature dynamic clients 416 * @hbm_f_dot_supported : hbm feature disconnect on timeout 417 * @hbm_f_ev_supported : hbm feature event notification 418 * @hbm_f_fa_supported : hbm feature fixed address client 419 * @hbm_f_ie_supported : hbm feature immediate reply to enum request 420 * @hbm_f_os_supported : hbm feature support OS ver message 421 * @hbm_f_dr_supported : hbm feature dma ring supported 422 * 423 * @fw_ver : FW versions 424 * 425 * @me_clients_rwsem: rw lock over me_clients list 426 * @me_clients : list of FW clients 427 * @me_clients_map : FW clients bit map 428 * @host_clients_map : host clients id pool 429 * 430 * @allow_fixed_address: allow user space to connect a fixed client 431 * @override_fixed_address: force allow fixed address behavior 432 * 433 * @reset_work : work item for the device reset 434 * @bus_rescan_work : work item for the bus rescan 435 * 436 * @device_list : mei client bus list 437 * @cl_bus_lock : client bus list lock 438 * 439 * @dbgfs_dir : debugfs mei root directory 440 * 441 * @ops: : hw specific operations 442 * @hw : hw specific data 443 */ 444 struct mei_device { 445 struct device *dev; 446 struct cdev cdev; 447 int minor; 448 449 struct list_head write_list; 450 struct list_head write_waiting_list; 451 struct list_head ctrl_wr_list; 452 struct list_head ctrl_rd_list; 453 u8 tx_queue_limit; 454 455 struct list_head file_list; 456 long open_handle_count; 457 458 struct mutex device_lock; 459 struct delayed_work timer_work; 460 461 bool recvd_hw_ready; 462 /* 463 * waiting queue for receive message from FW 464 */ 465 wait_queue_head_t wait_hw_ready; 466 wait_queue_head_t wait_pg; 467 wait_queue_head_t wait_hbm_start; 468 469 /* 470 * mei device states 471 */ 472 unsigned long reset_count; 473 enum mei_dev_state dev_state; 474 enum mei_hbm_state hbm_state; 475 u16 init_clients_timer; 476 477 /* 478 * Power Gating support 479 */ 480 enum mei_pg_event pg_event; 481 #ifdef CONFIG_PM 482 struct dev_pm_domain pg_domain; 483 #endif /* CONFIG_PM */ 484 485 unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; 486 u32 rd_msg_hdr; 487 488 /* write buffer */ 489 bool hbuf_is_ready; 490 491 struct hbm_version version; 492 unsigned int hbm_f_pg_supported:1; 493 unsigned int hbm_f_dc_supported:1; 494 unsigned int hbm_f_dot_supported:1; 495 unsigned int hbm_f_ev_supported:1; 496 unsigned int hbm_f_fa_supported:1; 497 unsigned int hbm_f_ie_supported:1; 498 unsigned int hbm_f_os_supported:1; 499 unsigned int hbm_f_dr_supported:1; 500 501 struct mei_fw_version fw_ver[MEI_MAX_FW_VER_BLOCKS]; 502 503 struct rw_semaphore me_clients_rwsem; 504 struct list_head me_clients; 505 DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX); 506 DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX); 507 508 bool allow_fixed_address; 509 bool override_fixed_address; 510 511 struct work_struct reset_work; 512 struct work_struct bus_rescan_work; 513 514 /* List of bus devices */ 515 struct list_head device_list; 516 struct mutex cl_bus_lock; 517 518 #if IS_ENABLED(CONFIG_DEBUG_FS) 519 struct dentry *dbgfs_dir; 520 #endif /* CONFIG_DEBUG_FS */ 521 522 523 const struct mei_hw_ops *ops; 524 char hw[0] __aligned(sizeof(void *)); 525 }; 526 527 static inline unsigned long mei_secs_to_jiffies(unsigned long sec) 528 { 529 return msecs_to_jiffies(sec * MSEC_PER_SEC); 530 } 531 532 /** 533 * mei_data2slots - get slots number from a message length 534 * 535 * @length: size of the messages in bytes 536 * 537 * Return: number of slots 538 */ 539 static inline u32 mei_data2slots(size_t length) 540 { 541 return DIV_ROUND_UP(length, MEI_SLOT_SIZE); 542 } 543 544 /** 545 * mei_hbm2slots - get slots number from a hbm message length 546 * length + size of the mei message header 547 * 548 * @length: size of the messages in bytes 549 * 550 * Return: number of slots 551 */ 552 static inline u32 mei_hbm2slots(size_t length) 553 { 554 return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, MEI_SLOT_SIZE); 555 } 556 557 /** 558 * mei_slots2data - get data in slots - bytes from slots 559 * 560 * @slots: number of available slots 561 * 562 * Return: number of bytes in slots 563 */ 564 static inline u32 mei_slots2data(int slots) 565 { 566 return slots * MEI_SLOT_SIZE; 567 } 568 569 /* 570 * mei init function prototypes 571 */ 572 void mei_device_init(struct mei_device *dev, 573 struct device *device, 574 const struct mei_hw_ops *hw_ops); 575 int mei_reset(struct mei_device *dev); 576 int mei_start(struct mei_device *dev); 577 int mei_restart(struct mei_device *dev); 578 void mei_stop(struct mei_device *dev); 579 void mei_cancel_work(struct mei_device *dev); 580 581 /* 582 * MEI interrupt functions prototype 583 */ 584 585 void mei_timer(struct work_struct *work); 586 void mei_schedule_stall_timer(struct mei_device *dev); 587 int mei_irq_read_handler(struct mei_device *dev, 588 struct list_head *cmpl_list, s32 *slots); 589 590 int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list); 591 void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list); 592 593 /* 594 * Register Access Function 595 */ 596 597 598 static inline void mei_hw_config(struct mei_device *dev) 599 { 600 dev->ops->hw_config(dev); 601 } 602 603 static inline enum mei_pg_state mei_pg_state(struct mei_device *dev) 604 { 605 return dev->ops->pg_state(dev); 606 } 607 608 static inline bool mei_pg_in_transition(struct mei_device *dev) 609 { 610 return dev->ops->pg_in_transition(dev); 611 } 612 613 static inline bool mei_pg_is_enabled(struct mei_device *dev) 614 { 615 return dev->ops->pg_is_enabled(dev); 616 } 617 618 static inline int mei_hw_reset(struct mei_device *dev, bool enable) 619 { 620 return dev->ops->hw_reset(dev, enable); 621 } 622 623 static inline int mei_hw_start(struct mei_device *dev) 624 { 625 return dev->ops->hw_start(dev); 626 } 627 628 static inline void mei_clear_interrupts(struct mei_device *dev) 629 { 630 dev->ops->intr_clear(dev); 631 } 632 633 static inline void mei_enable_interrupts(struct mei_device *dev) 634 { 635 dev->ops->intr_enable(dev); 636 } 637 638 static inline void mei_disable_interrupts(struct mei_device *dev) 639 { 640 dev->ops->intr_disable(dev); 641 } 642 643 static inline void mei_synchronize_irq(struct mei_device *dev) 644 { 645 dev->ops->synchronize_irq(dev); 646 } 647 648 static inline bool mei_host_is_ready(struct mei_device *dev) 649 { 650 return dev->ops->host_is_ready(dev); 651 } 652 static inline bool mei_hw_is_ready(struct mei_device *dev) 653 { 654 return dev->ops->hw_is_ready(dev); 655 } 656 657 static inline bool mei_hbuf_is_ready(struct mei_device *dev) 658 { 659 return dev->ops->hbuf_is_ready(dev); 660 } 661 662 static inline int mei_hbuf_empty_slots(struct mei_device *dev) 663 { 664 return dev->ops->hbuf_free_slots(dev); 665 } 666 667 static inline u32 mei_hbuf_depth(const struct mei_device *dev) 668 { 669 return dev->ops->hbuf_depth(dev); 670 } 671 672 static inline int mei_write_message(struct mei_device *dev, 673 const void *hdr, size_t hdr_len, 674 const void *data, size_t data_len) 675 { 676 return dev->ops->write(dev, hdr, hdr_len, data, data_len); 677 } 678 679 static inline u32 mei_read_hdr(const struct mei_device *dev) 680 { 681 return dev->ops->read_hdr(dev); 682 } 683 684 static inline void mei_read_slots(struct mei_device *dev, 685 unsigned char *buf, unsigned long len) 686 { 687 dev->ops->read(dev, buf, len); 688 } 689 690 static inline int mei_count_full_read_slots(struct mei_device *dev) 691 { 692 return dev->ops->rdbuf_full_slots(dev); 693 } 694 695 static inline int mei_fw_status(struct mei_device *dev, 696 struct mei_fw_status *fw_status) 697 { 698 return dev->ops->fw_status(dev, fw_status); 699 } 700 701 bool mei_hbuf_acquire(struct mei_device *dev); 702 703 bool mei_write_is_idle(struct mei_device *dev); 704 705 #if IS_ENABLED(CONFIG_DEBUG_FS) 706 int mei_dbgfs_register(struct mei_device *dev, const char *name); 707 void mei_dbgfs_deregister(struct mei_device *dev); 708 #else 709 static inline int mei_dbgfs_register(struct mei_device *dev, const char *name) 710 { 711 return 0; 712 } 713 static inline void mei_dbgfs_deregister(struct mei_device *dev) {} 714 #endif /* CONFIG_DEBUG_FS */ 715 716 int mei_register(struct mei_device *dev, struct device *parent); 717 void mei_deregister(struct mei_device *dev); 718 719 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d dma=%1d internal=%1d comp=%1d" 720 #define MEI_HDR_PRM(hdr) \ 721 (hdr)->host_addr, (hdr)->me_addr, \ 722 (hdr)->length, (hdr)->dma_ring, (hdr)->internal, (hdr)->msg_complete 723 724 ssize_t mei_fw_status2str(struct mei_fw_status *fw_sts, char *buf, size_t len); 725 /** 726 * mei_fw_status_str - fetch and convert fw status registers to printable string 727 * 728 * @dev: the device structure 729 * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ 730 * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ 731 * 732 * Return: number of bytes written or < 0 on failure 733 */ 734 static inline ssize_t mei_fw_status_str(struct mei_device *dev, 735 char *buf, size_t len) 736 { 737 struct mei_fw_status fw_status; 738 int ret; 739 740 buf[0] = '\0'; 741 742 ret = mei_fw_status(dev, &fw_status); 743 if (ret) 744 return ret; 745 746 ret = mei_fw_status2str(&fw_status, buf, MEI_FW_STATUS_STR_SZ); 747 748 return ret; 749 } 750 751 752 #endif 753