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
  25 #include "hw.h"
  26 #include "hw-me-regs.h"
  27
  28 /*
  29  * watch dog definition
  30  */
  31 #define MEI_WD_HDR_SIZE       4
  32 #define MEI_WD_STOP_MSG_SIZE  MEI_WD_HDR_SIZE
  33 #define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16)
  34
  35 #define MEI_WD_DEFAULT_TIMEOUT   120  /* seconds */
  36 #define MEI_WD_MIN_TIMEOUT       120  /* seconds */
  37 #define MEI_WD_MAX_TIMEOUT     65535  /* seconds */
  38
  39 #define MEI_WD_STOP_TIMEOUT      10 /* msecs */
  40
  41 #define MEI_WD_STATE_INDEPENDENCE_MSG_SENT       (1 << 0)
  42
  43 #define MEI_RD_MSG_BUF_SIZE           (128 * sizeof(u32))
  44
  45
  46 /*
  47  * AMTHI Client UUID
  48  */
  49 extern const uuid_le mei_amthif_guid;
  50
  51 /*
  52  * Watchdog Client UUID
  53  */
  54 extern const uuid_le mei_wd_guid;
  55
  56 /*
  57  * Watchdog independence state message
  58  */
  59 extern const u8 mei_wd_state_independence_msg[3][4];
  60
  61 /*
  62  * Number of Maximum MEI Clients
  63  */
  64 #define MEI_CLIENTS_MAX 256
  65
  66 /*
  67  * Number of File descriptors/handles
  68  * that can be opened to the driver.
  69  *
  70  * Limit to 255: 256 Total Clients
  71  * minus internal client for MEI Bus Messags
  72  */
  73 #define  MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)
  74
  75 /*
  76  * Internal Clients Number
  77  */
  78 #define MEI_HOST_CLIENT_ID_ANY        (-1)
  79 #define MEI_HBM_HOST_CLIENT_ID         0 /* not used, just for documentation */
  80 #define MEI_WD_HOST_CLIENT_ID          1
  81 #define MEI_IAMTHIF_HOST_CLIENT_ID     2
  82
  83
  84 /* File state */
  85 enum file_state {
  86         MEI_FILE_INITIALIZING = 0,
  87         MEI_FILE_CONNECTING,
  88         MEI_FILE_CONNECTED,
  89         MEI_FILE_DISCONNECTING,
  90         MEI_FILE_DISCONNECTED
  91 };
  92
  93 /* MEI device states */
  94 enum mei_dev_state {
  95         MEI_DEV_INITIALIZING = 0,
  96         MEI_DEV_INIT_CLIENTS,
  97         MEI_DEV_ENABLED,
  98         MEI_DEV_RESETING,
  99         MEI_DEV_DISABLED,
 100         MEI_DEV_RECOVERING_FROM_RESET,
 101         MEI_DEV_POWER_DOWN,
 102         MEI_DEV_POWER_UP
 103 };
 104
 105 const char *mei_dev_state_str(int state);
 106
 107 /* init clients states*/
 108 enum mei_init_clients_states {
 109         MEI_START_MESSAGE = 0,
 110         MEI_ENUM_CLIENTS_MESSAGE,
 111         MEI_CLIENT_PROPERTIES_MESSAGE
 112 };
 113
 114 enum iamthif_states {
 115         MEI_IAMTHIF_IDLE,
 116         MEI_IAMTHIF_WRITING,
 117         MEI_IAMTHIF_FLOW_CONTROL,
 118         MEI_IAMTHIF_READING,
 119         MEI_IAMTHIF_READ_COMPLETE
 120 };
 121
 122 enum mei_file_transaction_states {
 123         MEI_IDLE,
 124         MEI_WRITING,
 125         MEI_WRITE_COMPLETE,
 126         MEI_FLOW_CONTROL,
 127         MEI_READING,
 128         MEI_READ_COMPLETE
 129 };
 130
 131 enum mei_wd_states {
 132         MEI_WD_IDLE,
 133         MEI_WD_RUNNING,
 134         MEI_WD_STOPPING,
 135 };
 136
 137 /**
 138  * enum mei_cb_file_ops  - file operation associated with the callback
 139  * @MEI_FOP_READ   - read
 140  * @MEI_FOP_WRITE  - write
 141  * @MEI_FOP_IOCTL  - ioctl
 142  * @MEI_FOP_OPEN   - open
 143  * @MEI_FOP_CLOSE  - close
 144  */
 145 enum mei_cb_file_ops {
 146         MEI_FOP_READ = 0,
 147         MEI_FOP_WRITE,
 148         MEI_FOP_IOCTL,
 149         MEI_FOP_OPEN,
 150         MEI_FOP_CLOSE
 151 };
 152
 153 /*
 154  * Intel MEI message data struct
 155  */
 156 struct mei_message_data {
 157         u32 size;
 158         unsigned char *data;
 159 };
 160
 161 /**
 162  * struct mei_me_client - representation of me (fw) client
 163  *
 164  * @props  - client properties
 165  * @client_id - me client id
 166  * @mei_flow_ctrl_creds - flow control credits
 167  */
 168 struct mei_me_client {
 169         struct mei_client_properties props;
 170         u8 client_id;
 171         u8 mei_flow_ctrl_creds;
 172 };
 173
 174
 175 struct mei_cl;
 176
 177 /**
 178  * struct mei_cl_cb - file operation callback structure
 179  *
 180  * @cl - file client who is running this operation
 181  * @fop_type - file operation type
 182  */
 183 struct mei_cl_cb {
 184         struct list_head list;
 185         struct mei_cl *cl;
 186         enum mei_cb_file_ops fop_type;
 187         struct mei_message_data request_buffer;
 188         struct mei_message_data response_buffer;
 189         unsigned long buf_idx;
 190         unsigned long read_time;
 191         struct file *file_object;
 192 };
 193
 194 /* MEI client instance carried as file->pirvate_data*/
 195 struct mei_cl {
 196         struct list_head link;
 197         struct mei_device *dev;
 198         enum file_state state;
 199         wait_queue_head_t tx_wait;
 200         wait_queue_head_t rx_wait;
 201         wait_queue_head_t wait;
 202         int status;
 203         /* ID of client connected */
 204         u8 host_client_id;
 205         u8 me_client_id;
 206         u8 mei_flow_ctrl_creds;
 207         u8 timer_count;
 208         enum mei_file_transaction_states reading_state;
 209         enum mei_file_transaction_states writing_state;
 210         int sm_state;
 211         struct mei_cl_cb *read_cb;
 212 };
 213
 214 /** struct mei_hw_ops
 215  *
 216  * @host_set_ready   - notify FW that host side is ready
 217  * @host_is_ready    - query for host readiness
 218
 219  * @hw_is_ready      - query if hw is ready
 220  * @hw_reset         - reset hw
 221  * @hw_config        - configure hw
 222
 223  * @intr_clear       - clear pending interrupts
 224  * @intr_enable      - enable interrupts
 225  * @intr_disable     - disable interrupts
 226
 227  * @hbuf_free_slots  - query for write buffer empty slots
 228  * @hbuf_is_ready    - query if write buffer is empty
 229  * @hbuf_max_len     - query for write buffer max len
 230
 231  * @write            - write a message to FW
 232
 233  * @rdbuf_full_slots - query how many slots are filled
 234
 235  * @read_hdr         - get first 4 bytes (header)
 236  * @read             - read a buffer from the FW
 237  */
 238 struct mei_hw_ops {
 239
 240         void (*host_set_ready) (struct mei_device *dev);
 241         bool (*host_is_ready) (struct mei_device *dev);
 242
 243         bool (*hw_is_ready) (struct mei_device *dev);
 244         void (*hw_reset) (struct mei_device *dev, bool enable);
 245         void (*hw_config) (struct mei_device *dev);
 246
 247         void (*intr_clear) (struct mei_device *dev);
 248         void (*intr_enable) (struct mei_device *dev);
 249         void (*intr_disable) (struct mei_device *dev);
 250
 251         int (*hbuf_free_slots) (struct mei_device *dev);
 252         bool (*hbuf_is_ready) (struct mei_device *dev);
 253         size_t (*hbuf_max_len) (const struct mei_device *dev);
 254
 255         int (*write)(struct mei_device *dev,
 256                      struct mei_msg_hdr *hdr,
 257                      unsigned char *buf);
 258
 259         int (*rdbuf_full_slots)(struct mei_device *dev);
 260
 261         u32 (*read_hdr)(const struct mei_device *dev);
 262         int (*read) (struct mei_device *dev,
 263                      unsigned char *buf, unsigned long len);
 264 };
 265
 266 /**
 267  * struct mei_device -  MEI private device struct
 268
 269  * @mem_addr - mem mapped base register address
 270
 271  * @hbuf_depth - depth of hardware host/write buffer is slots
 272  * @hbuf_is_ready - query if the host host/write buffer is ready
 273  * @wr_msg - the buffer for hbm control messages
 274  * @wr_ext_msg - the buffer for hbm control responses (set in read cycle)
 275  */
 276 struct mei_device {
 277         struct pci_dev *pdev;   /* pointer to pci device struct */
 278         /*
 279          * lists of queues
 280          */
 281         /* array of pointers to aio lists */
 282         struct mei_cl_cb read_list;             /* driver read queue */
 283         struct mei_cl_cb write_list;            /* driver write queue */
 284         struct mei_cl_cb write_waiting_list;    /* write waiting queue */
 285         struct mei_cl_cb ctrl_wr_list;          /* managed write IOCTL list */
 286         struct mei_cl_cb ctrl_rd_list;          /* managed read IOCTL list */
 287
 288         /*
 289          * list of files
 290          */
 291         struct list_head file_list;
 292         long open_handle_count;
 293
 294         /*
 295          * lock for the device
 296          */
 297         struct mutex device_lock; /* device lock */
 298         struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */
 299         bool recvd_msg;
 300
 301         /*
 302          * waiting queue for receive message from FW
 303          */
 304         wait_queue_head_t wait_recvd_msg;
 305         wait_queue_head_t wait_stop_wd;
 306
 307         /*
 308          * mei device  states
 309          */
 310         enum mei_dev_state dev_state;
 311         enum mei_init_clients_states init_clients_state;
 312         u16 init_clients_timer;
 313
 314         unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE];  /* control messages */
 315         u32 rd_msg_hdr;
 316
 317         /* write buffer */
 318         u8 hbuf_depth;
 319         bool hbuf_is_ready;
 320
 321         /* used for control messages */
 322         struct {
 323                 struct mei_msg_hdr hdr;
 324                 unsigned char data[128];
 325         } wr_msg;
 326
 327         struct {
 328                 struct mei_msg_hdr hdr;
 329                 unsigned char data[4];  /* All HBM messages are 4 bytes */
 330         } wr_ext_msg;           /* for control responses */
 331
 332         struct hbm_version version;
 333
 334         struct mei_me_client *me_clients; /* Note: memory has to be allocated */
 335         DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
 336         DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
 337         u8 me_clients_num;
 338         u8 me_client_presentation_num;
 339         u8 me_client_index;
 340
 341         struct mei_cl wd_cl;
 342         enum mei_wd_states wd_state;
 343         bool wd_pending;
 344         u16 wd_timeout;
 345         unsigned char wd_data[MEI_WD_START_MSG_SIZE];
 346
 347
 348         /* amthif list for cmd waiting */
 349         struct mei_cl_cb amthif_cmd_list;
 350         /* driver managed amthif list for reading completed amthif cmd data */
 351         struct mei_cl_cb amthif_rd_complete_list;
 352         struct file *iamthif_file_object;
 353         struct mei_cl iamthif_cl;
 354         struct mei_cl_cb *iamthif_current_cb;
 355         int iamthif_mtu;
 356         unsigned long iamthif_timer;
 357         u32 iamthif_stall_timer;
 358         unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
 359         u32 iamthif_msg_buf_size;
 360         u32 iamthif_msg_buf_index;
 361         enum iamthif_states iamthif_state;
 362         bool iamthif_flow_control_pending;
 363         bool iamthif_ioctl;
 364         bool iamthif_canceled;
 365
 366         struct work_struct init_work;
 367
 368         const struct mei_hw_ops *ops;
 369         char hw[0] __aligned(sizeof(void *));
 370 };
 371
 372 static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
 373 {
 374         return msecs_to_jiffies(sec * MSEC_PER_SEC);
 375 }
 376
 377
 378 /*
 379  * mei init function prototypes
 380  */
 381 void mei_device_init(struct mei_device *dev);
 382 void mei_reset(struct mei_device *dev, int interrupts);
 383 int mei_hw_init(struct mei_device *dev);
 384 void mei_stop(struct mei_device *dev);
 385
 386 /*
 387  *  MEI interrupt functions prototype
 388  */
 389
 390 void mei_timer(struct work_struct *work);
 391 int mei_irq_read_handler(struct mei_device *dev,
 392                 struct mei_cl_cb *cmpl_list, s32 *slots);
 393
 394 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
 395
 396 void mei_irq_complete_handler(struct mei_cl *cl, struct mei_cl_cb *cb_pos);
 397
 398 /*
 399  * AMTHIF - AMT Host Interface Functions
 400  */
 401 void mei_amthif_reset_params(struct mei_device *dev);
 402
 403 int mei_amthif_host_init(struct mei_device *dev);
 404
 405 int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
 406
 407 int mei_amthif_read(struct mei_device *dev, struct file *file,
 408                 char __user *ubuf, size_t length, loff_t *offset);
 409
 410 unsigned int mei_amthif_poll(struct mei_device *dev,
 411                 struct file *file, poll_table *wait);
 412
 413 int mei_amthif_release(struct mei_device *dev, struct file *file);
 414
 415 struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
 416                                                 struct file *file);
 417
 418 void mei_amthif_run_next_cmd(struct mei_device *dev);
 419
 420
 421 int mei_amthif_irq_write_complete(struct mei_device *dev, s32 *slots,
 422                         struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list);
 423
 424 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
 425 int mei_amthif_irq_read_message(struct mei_cl_cb *complete_list,
 426                 struct mei_device *dev, struct mei_msg_hdr *mei_hdr);
 427 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
 428
 429
 430 int mei_wd_send(struct mei_device *dev);
 431 int mei_wd_stop(struct mei_device *dev);
 432 int mei_wd_host_init(struct mei_device *dev);
 433 /*
 434  * mei_watchdog_register  - Registering watchdog interface
 435  *   once we got connection to the WD Client
 436  * @dev - mei device
 437  */
 438 void mei_watchdog_register(struct mei_device *dev);
 439 /*
 440  * mei_watchdog_unregister  - Unregistering watchdog interface
 441  * @dev - mei device
 442  */
 443 void mei_watchdog_unregister(struct mei_device *dev);
 444
 445 /*
 446  * Register Access Function
 447  */
 448
 449 static inline void mei_hw_config(struct mei_device *dev)
 450 {
 451         dev->ops->hw_config(dev);
 452 }
 453 static inline void mei_hw_reset(struct mei_device *dev, bool enable)
 454 {
 455         dev->ops->hw_reset(dev, enable);
 456 }
 457
 458 static inline void mei_clear_interrupts(struct mei_device *dev)
 459 {
 460         dev->ops->intr_clear(dev);
 461 }
 462
 463 static inline void mei_enable_interrupts(struct mei_device *dev)
 464 {
 465         dev->ops->intr_enable(dev);
 466 }
 467
 468 static inline void mei_disable_interrupts(struct mei_device *dev)
 469 {
 470         dev->ops->intr_disable(dev);
 471 }
 472
 473 static inline void mei_host_set_ready(struct mei_device *dev)
 474 {
 475         dev->ops->host_set_ready(dev);
 476 }
 477 static inline bool mei_host_is_ready(struct mei_device *dev)
 478 {
 479         return dev->ops->host_is_ready(dev);
 480 }
 481 static inline bool mei_hw_is_ready(struct mei_device *dev)
 482 {
 483         return dev->ops->hw_is_ready(dev);
 484 }
 485
 486 static inline bool mei_hbuf_is_ready(struct mei_device *dev)
 487 {
 488         return dev->ops->hbuf_is_ready(dev);
 489 }
 490
 491 static inline int mei_hbuf_empty_slots(struct mei_device *dev)
 492 {
 493         return dev->ops->hbuf_free_slots(dev);
 494 }
 495
 496 static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
 497 {
 498         return dev->ops->hbuf_max_len(dev);
 499 }
 500
 501 static inline int mei_write_message(struct mei_device *dev,
 502                         struct mei_msg_hdr *hdr,
 503                         unsigned char *buf)
 504 {
 505         return dev->ops->write(dev, hdr, buf);
 506 }
 507
 508 static inline u32 mei_read_hdr(const struct mei_device *dev)
 509 {
 510         return dev->ops->read_hdr(dev);
 511 }
 512
 513 static inline void mei_read_slots(struct mei_device *dev,
 514                      unsigned char *buf, unsigned long len)
 515 {
 516         dev->ops->read(dev, buf, len);
 517 }
 518
 519 static inline int mei_count_full_read_slots(struct mei_device *dev)
 520 {
 521         return dev->ops->rdbuf_full_slots(dev);
 522 }
 523
 524 int mei_register(struct device *dev);
 525 void mei_deregister(void);
 526
 527 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"
 528 #define MEI_HDR_PRM(hdr)                  \
 529         (hdr)->host_addr, (hdr)->me_addr, \
 530         (hdr)->length, (hdr)->msg_complete
 531
 532 #endif