drivers/staging/mei/mei_dev.h

   1 /*
   2  *
   3  * Intel Management Engine Interface (Intel MEI) Linux driver
   4  * Copyright (c) 2003-2011, 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 "mei.h"
  22 #include "hw.h"
  23
  24 /*
  25  * MEI Char Driver Minors
  26  */
  27 #define MEI_MINORS_BASE 1
  28 #define MEI_MINORS_COUNT        1
  29 #define MEI_MINOR_NUMBER        1
  30
  31 /*
  32  * watch dog definition
  33  */
  34 #define MEI_WATCHDOG_DATA_SIZE         16
  35 #define MEI_START_WD_DATA_SIZE         20
  36 #define MEI_WD_PARAMS_SIZE             4
  37 #define MEI_WD_STATE_INDEPENDENCE_MSG_SENT       (1 << 0)
  38
  39 /*
  40  * AMTHI Client UUID
  41  */
  42 extern const uuid_le mei_amthi_guid;
  43
  44 /*
  45  * Watchdog Client UUID
  46  */
  47 extern const uuid_le mei_wd_guid;
  48
  49 /*
  50  * Watchdog independence state message
  51  */
  52 extern const u8 mei_wd_state_independence_msg[3][4];
  53
  54 /*
  55  * Number of File descriptors/handles
  56  * that can be opened to the driver.
  57  *
  58  * Limit to 253: 255 Total Clients
  59  * minus internal client for AMTHI
  60  * minus internal client for Watchdog
  61  */
  62 #define  MEI_MAX_OPEN_HANDLE_COUNT      253
  63
  64 /*
  65  * Number of queue lists used by this driver
  66  */
  67 #define MEI_IO_LISTS_NUMBER        7
  68
  69 /*
  70  * Number of Maximum MEI Clients
  71  */
  72 #define MEI_CLIENTS_MAX 255
  73
  74 /* File state */
  75 enum file_state {
  76         MEI_FILE_INITIALIZING = 0,
  77         MEI_FILE_CONNECTING,
  78         MEI_FILE_CONNECTED,
  79         MEI_FILE_DISCONNECTING,
  80         MEI_FILE_DISCONNECTED
  81 };
  82
  83 /* MEI device states */
  84 enum mei_states {
  85         MEI_INITIALIZING = 0,
  86         MEI_INIT_CLIENTS,
  87         MEI_ENABLED,
  88         MEI_RESETING,
  89         MEI_DISABLED,
  90         MEI_RECOVERING_FROM_RESET,
  91         MEI_POWER_DOWN,
  92         MEI_POWER_UP
  93 };
  94
  95 /* init clients  states*/
  96 enum mei_init_clients_states {
  97         MEI_START_MESSAGE = 0,
  98         MEI_ENUM_CLIENTS_MESSAGE,
  99         MEI_CLIENT_PROPERTIES_MESSAGE
 100 };
 101
 102 enum iamthif_states {
 103         MEI_IAMTHIF_IDLE,
 104         MEI_IAMTHIF_WRITING,
 105         MEI_IAMTHIF_FLOW_CONTROL,
 106         MEI_IAMTHIF_READING,
 107         MEI_IAMTHIF_READ_COMPLETE
 108 };
 109
 110 enum mei_file_transaction_states {
 111         MEI_IDLE,
 112         MEI_WRITING,
 113         MEI_WRITE_COMPLETE,
 114         MEI_FLOW_CONTROL,
 115         MEI_READING,
 116         MEI_READ_COMPLETE
 117 };
 118
 119 /* MEI CB */
 120 enum mei_cb_major_types {
 121         MEI_READ = 0,
 122         MEI_WRITE,
 123         MEI_IOCTL,
 124         MEI_OPEN,
 125         MEI_CLOSE
 126 };
 127
 128 /*
 129  * Intel MEI message data struct
 130  */
 131 struct mei_message_data {
 132         u32 size;
 133         char *data;
 134 } __packed;
 135
 136
 137 struct mei_cl_cb {
 138         struct list_head cb_list;
 139         enum mei_cb_major_types major_file_operations;
 140         void *file_private;
 141         struct mei_message_data request_buffer;
 142         struct mei_message_data response_buffer;
 143         unsigned long information;
 144         unsigned long read_time;
 145         struct file *file_object;
 146 };
 147
 148 /* MEI client instance carried as file->pirvate_data*/
 149 struct mei_cl {
 150         struct list_head link;
 151         struct mei_device *dev;
 152         enum file_state state;
 153         wait_queue_head_t tx_wait;
 154         wait_queue_head_t rx_wait;
 155         wait_queue_head_t wait;
 156         int read_pending;
 157         int status;
 158         /* ID of client connected */
 159         u8 host_client_id;
 160         u8 me_client_id;
 161         u8 mei_flow_ctrl_creds;
 162         u8 timer_count;
 163         enum mei_file_transaction_states reading_state;
 164         enum mei_file_transaction_states writing_state;
 165         int sm_state;
 166         struct mei_cl_cb *read_cb;
 167 };
 168
 169 struct mei_io_list {
 170         struct mei_cl_cb mei_cb;
 171         int status;
 172         struct mei_device *device_extension;
 173 };
 174
 175 /* MEI private device struct */
 176 struct mei_device {
 177         struct pci_dev *pdev;   /* pointer to pci device struct */
 178         /*
 179          * lists of queues
 180          */
 181          /* array of pointers to aio lists */
 182         struct mei_io_list *io_list_array[MEI_IO_LISTS_NUMBER];
 183         struct mei_io_list read_list;           /* driver read queue */
 184         struct mei_io_list write_list;          /* driver write queue */
 185         struct mei_io_list write_waiting_list;  /* write waiting queue */
 186         struct mei_io_list ctrl_wr_list;        /* managed write IOCTL list */
 187         struct mei_io_list ctrl_rd_list;        /* managed read IOCTL list */
 188         struct mei_io_list amthi_cmd_list;      /* amthi list for cmd waiting */
 189
 190         /* driver managed amthi list for reading completed amthi cmd data */
 191         struct mei_io_list amthi_read_complete_list;
 192         /*
 193          * list of files
 194          */
 195         struct list_head file_list;
 196         /*
 197          * memory of device
 198          */
 199         unsigned int mem_base;
 200         unsigned int mem_length;
 201         void __iomem *mem_addr;
 202         /*
 203          * lock for the device
 204          */
 205         struct mutex device_lock; /* device lock */
 206         int recvd_msg;
 207         struct delayed_work wd_work;    /* watch dog deleye work */
 208         /*
 209          * hw states of host and fw(ME)
 210          */
 211         u32 host_hw_state;
 212         u32 me_hw_state;
 213         /*
 214          * waiting queue for receive message from FW
 215          */
 216         wait_queue_head_t wait_recvd_msg;
 217         wait_queue_head_t wait_stop_wd;
 218
 219         /*
 220          * mei device  states
 221          */
 222         enum mei_states mei_state;
 223         enum mei_init_clients_states init_clients_state;
 224         u16 init_clients_timer;
 225         int stop;
 226
 227         u32 extra_write_index;
 228         u32 rd_msg_buf[128];    /* used for control messages */
 229         u32 wr_msg_buf[128];    /* used for control messages */
 230         u32 ext_msg_buf[8];     /* for control responses */
 231         u32 rd_msg_hdr;
 232
 233         struct hbm_version version;
 234
 235         int mei_host_buffer_is_empty;
 236         struct mei_cl wd_cl;
 237         struct mei_me_client *me_clients; /* Note: memory has to be allocated */
 238         DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
 239         DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
 240         u8 num_mei_me_clients;
 241         u8 me_client_presentation_num;
 242         u8 me_client_index;
 243
 244         int wd_pending;
 245         int wd_stopped;
 246         u16 wd_timeout; /* seconds ((wd_data[1] << 8) + wd_data[0]) */
 247         unsigned char wd_data[MEI_START_WD_DATA_SIZE];
 248
 249
 250         u16 wd_due_counter;
 251         bool wd_bypass; /* if false, don't refresh watchdog ME client */
 252
 253         struct file *iamthif_file_object;
 254         struct mei_cl iamthif_cl;
 255         int iamthif_ioctl;
 256         int iamthif_canceled;
 257         int iamthif_mtu;
 258         unsigned long iamthif_timer;
 259         u32 iamthif_stall_timer;
 260         unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
 261         u32 iamthif_msg_buf_size;
 262         u32 iamthif_msg_buf_index;
 263         int iamthif_flow_control_pending;
 264         enum iamthif_states iamthif_state;
 265         struct mei_cl_cb *iamthif_current_cb;
 266         u8 write_hang;
 267         int need_reset;
 268         long open_handle_count;
 269
 270 };
 271
 272
 273 /*
 274  * mei init function prototypes
 275  */
 276 struct mei_device *mei_device_init(struct pci_dev *pdev);
 277 void mei_reset(struct mei_device *dev, int interrupts);
 278 int mei_hw_init(struct mei_device *dev);
 279 int mei_task_initialize_clients(void *data);
 280 int mei_initialize_clients(struct mei_device *dev);
 281 int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl);
 282 void mei_initialize_list(struct mei_io_list *list, struct mei_device *dev);
 283 void mei_flush_list(struct mei_io_list *list, struct mei_cl *cl);
 284 void mei_flush_queues(struct mei_device *dev, struct mei_cl *cl);
 285 void mei_remove_client_from_file_list(struct mei_device *dev, u8 host_client_id);
 286 void mei_host_init_iamthif(struct mei_device *dev);
 287 void mei_allocate_me_clients_storage(struct mei_device *dev);
 288
 289
 290 u8 mei_find_me_client_update_filext(struct mei_device *dev,
 291                                 struct mei_cl *priv,
 292                                 const uuid_le *cguid, u8 client_id);
 293
 294 /*
 295  * MEI ME Client Functions
 296  */
 297
 298 struct mei_cl *mei_cl_allocate(struct mei_device *dev);
 299 void mei_cl_init(struct mei_cl *priv, struct mei_device *dev);
 300
 301
 302 /*
 303  * MEI Host Client Functions
 304  */
 305 void mei_host_start_message(struct mei_device *dev);
 306 void mei_host_enum_clients_message(struct mei_device *dev);
 307 void mei_host_client_properties(struct mei_device *dev);
 308
 309 /*
 310  *  MEI interrupt functions prototype
 311  */
 312 irqreturn_t mei_interrupt_quick_handler(int irq, void *dev_id);
 313 irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id);
 314 void mei_wd_timer(struct work_struct *work);
 315
 316 /*
 317  *  MEI input output function prototype
 318  */
 319 int mei_ioctl_connect_client(struct file *file,
 320                         struct mei_connect_client_data *data);
 321
 322 int mei_start_read(struct mei_device *dev, struct mei_cl *cl);
 323
 324 int amthi_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
 325
 326 int amthi_read(struct mei_device *dev, struct file *file,
 327               char __user *ubuf, size_t length, loff_t *offset);
 328
 329 struct mei_cl_cb *find_amthi_read_list_entry(struct mei_device *dev,
 330                                                 struct file *file);
 331
 332 void mei_run_next_iamthif_cmd(struct mei_device *dev);
 333
 334 void mei_free_cb_private(struct mei_cl_cb *priv_cb);
 335
 336 int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid);
 337
 338 /*
 339  * Register Access Function
 340  */
 341
 342 /**
 343  * mei_reg_read - Reads 32bit data from the mei device
 344  *
 345  * @dev: the device structure
 346  * @offset: offset from which to read the data
 347  *
 348  * returns the byte read.
 349  */
 350 static inline u32 mei_reg_read(struct mei_device *dev, unsigned long offset)
 351 {
 352         return ioread32(dev->mem_addr + offset);
 353 }
 354
 355 /**
 356  * mei_reg_write - Writes 32bit data to the mei device
 357  *
 358  * @dev: the device structure
 359  * @offset: offset from which to write the data
 360  * @value: the byte to write
 361  */
 362 static inline void mei_reg_write(struct mei_device *dev,
 363                                 unsigned long offset, u32 value)
 364 {
 365         iowrite32(value, dev->mem_addr + offset);
 366 }
 367
 368 /**
 369  * mei_hcsr_read - Reads 32bit data from the host CSR
 370  *
 371  * @dev: the device structure
 372  *
 373  * returns the byte read.
 374  */
 375 static inline u32 mei_hcsr_read(struct mei_device *dev)
 376 {
 377         return mei_reg_read(dev, H_CSR);
 378 }
 379
 380 /**
 381  * mei_mecsr_read - Reads 32bit data from the ME CSR
 382  *
 383  * @dev: the device structure
 384  *
 385  * returns ME_CSR_HA register value (u32)
 386  */
 387 static inline u32 mei_mecsr_read(struct mei_device *dev)
 388 {
 389         return mei_reg_read(dev, ME_CSR_HA);
 390 }
 391
 392 /**
 393  * get_me_cb_rw - Reads 32bit data from the mei ME_CB_RW register
 394  *
 395  * @dev: the device structure
 396  *
 397  * returns ME_CB_RW register value (u32)
 398  */
 399 static inline u32 mei_mecbrw_read(struct mei_device *dev)
 400 {
 401         return mei_reg_read(dev, ME_CB_RW);
 402 }
 403
 404
 405 /*
 406  * mei interface function prototypes
 407  */
 408 void mei_hcsr_set(struct mei_device *dev);
 409 void mei_csr_clear_his(struct mei_device *dev);
 410
 411 void mei_enable_interrupts(struct mei_device *dev);
 412 void mei_disable_interrupts(struct mei_device *dev);
 413
 414 /**
 415  * mei_fe_same_id - tells if file private data have same id
 416  *
 417  * @fe1: private data of 1. file object
 418  * @fe2: private data of 2. file object
 419  *
 420  * returns !=0 - if ids are the same, 0 - if differ.
 421  */
 422 static inline int mei_fe_same_id(const struct mei_cl *fe1,
 423                                   const struct mei_cl *fe2)
 424 {
 425         return ((fe1->host_client_id == fe2->host_client_id) &&
 426                 (fe1->me_client_id == fe2->me_client_id));
 427 }
 428
 429 #endif