drivers/misc/mei/mei_dev.h

   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