3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2012, Intel Corporation.
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.
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
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>
30 * watch dog definition
32 #define MEI_WD_HDR_SIZE 4
33 #define MEI_WD_STOP_MSG_SIZE MEI_WD_HDR_SIZE
34 #define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16)
36 #define MEI_WD_DEFAULT_TIMEOUT 120 /* seconds */
37 #define MEI_WD_MIN_TIMEOUT 120 /* seconds */
38 #define MEI_WD_MAX_TIMEOUT 65535 /* seconds */
40 #define MEI_WD_STOP_TIMEOUT 10 /* msecs */
42 #define MEI_WD_STATE_INDEPENDENCE_MSG_SENT (1 << 0)
44 #define MEI_RD_MSG_BUF_SIZE (128 * sizeof(u32))
50 extern const uuid_le mei_amthif_guid;
53 * Watchdog Client UUID
55 extern const uuid_le mei_wd_guid;
58 * Number of Maximum MEI Clients
60 #define MEI_CLIENTS_MAX 256
63 * maximum number of consecutive resets
65 #define MEI_MAX_CONSEC_RESET 3
68 * Number of File descriptors/handles
69 * that can be opened to the driver.
71 * Limit to 255: 256 Total Clients
72 * minus internal client for MEI Bus Messages
74 #define MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)
77 * Internal Clients Number
79 #define MEI_HOST_CLIENT_ID_ANY (-1)
80 #define MEI_HBM_HOST_CLIENT_ID 0 /* not used, just for documentation */
81 #define MEI_WD_HOST_CLIENT_ID 1
82 #define MEI_IAMTHIF_HOST_CLIENT_ID 2
87 MEI_FILE_INITIALIZING = 0,
90 MEI_FILE_DISCONNECTING,
94 /* MEI device states */
96 MEI_DEV_INITIALIZING = 0,
105 const char *mei_dev_state_str(int state);
107 enum iamthif_states {
110 MEI_IAMTHIF_FLOW_CONTROL,
112 MEI_IAMTHIF_READ_COMPLETE
115 enum mei_file_transaction_states {
131 * enum mei_cb_file_ops - file operation associated with the callback
132 * @MEI_FOP_READ - read
133 * @MEI_FOP_WRITE - write
134 * @MEI_FOP_CONNECT - connect
135 * @MEI_FOP_DISCONNECT_RSP - disconnect response
136 * @MEI_FOP_OPEN - open
137 * @MEI_FOP_CLOSE - close
139 enum mei_cb_file_ops {
143 MEI_FOP_DISCONNECT_RSP,
149 * Intel MEI message data struct
151 struct mei_msg_data {
157 * struct mei_me_client - representation of me (fw) client
159 * @props - client properties
160 * @client_id - me client id
161 * @mei_flow_ctrl_creds - flow control credits
163 struct mei_me_client {
164 struct mei_client_properties props;
166 u8 mei_flow_ctrl_creds;
173 * struct mei_cl_cb - file operation callback structure
175 * @cl - file client who is running this operation
176 * @fop_type - file operation type
179 struct list_head list;
181 enum mei_cb_file_ops fop_type;
182 struct mei_msg_data request_buffer;
183 struct mei_msg_data response_buffer;
184 unsigned long buf_idx;
185 unsigned long read_time;
186 struct file *file_object;
190 /* MEI client instance carried as file->private_data*/
192 struct list_head link;
193 struct mei_device *dev;
194 enum file_state state;
195 wait_queue_head_t tx_wait;
196 wait_queue_head_t rx_wait;
197 wait_queue_head_t wait;
199 /* ID of client connected */
202 u8 mei_flow_ctrl_creds;
204 enum mei_file_transaction_states reading_state;
205 enum mei_file_transaction_states writing_state;
206 struct mei_cl_cb *read_cb;
208 /* MEI CL bus data */
209 struct mei_cl_device *device;
210 struct list_head device_link;
214 /** struct mei_hw_ops
216 * @host_is_ready - query for host readiness
218 * @hw_is_ready - query if hw is ready
219 * @hw_reset - reset hw
220 * @hw_start - start hw after reset
221 * @hw_config - configure hw
223 * @intr_clear - clear pending interrupts
224 * @intr_enable - enable interrupts
225 * @intr_disable - disable interrupts
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
231 * @write - write a message to FW
233 * @rdbuf_full_slots - query how many slots are filled
235 * @read_hdr - get first 4 bytes (header)
236 * @read - read a buffer from the FW
240 bool (*host_is_ready)(struct mei_device *dev);
242 bool (*hw_is_ready)(struct mei_device *dev);
243 int (*hw_reset)(struct mei_device *dev, bool enable);
244 int (*hw_start)(struct mei_device *dev);
245 void (*hw_config)(struct mei_device *dev);
247 void (*intr_clear)(struct mei_device *dev);
248 void (*intr_enable)(struct mei_device *dev);
249 void (*intr_disable)(struct mei_device *dev);
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);
255 int (*write)(struct mei_device *dev,
256 struct mei_msg_hdr *hdr,
259 int (*rdbuf_full_slots)(struct mei_device *dev);
261 u32 (*read_hdr)(const struct mei_device *dev);
262 int (*read)(struct mei_device *dev,
263 unsigned char *buf, unsigned long len);
269 * struct mei_cl_ops - MEI CL device ops
270 * This structure allows ME host clients to implement technology
271 * specific operations.
273 * @enable: Enable an MEI CL device. Some devices require specific
274 * HECI commands to initialize completely.
275 * @disable: Disable an MEI CL device.
276 * @send: Tx hook for the device. This allows ME host clients to trap
277 * the device driver buffers before actually physically
278 * pushing it to the ME.
279 * @recv: Rx hook for the device. This allows ME host clients to trap the
280 * ME buffers before forwarding them to the device driver.
283 int (*enable)(struct mei_cl_device *device);
284 int (*disable)(struct mei_cl_device *device);
285 int (*send)(struct mei_cl_device *device, u8 *buf, size_t length);
286 int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length);
289 struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
290 uuid_le uuid, char *name,
291 struct mei_cl_ops *ops);
292 void mei_cl_remove_device(struct mei_cl_device *device);
294 int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
295 int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
296 int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
297 void mei_cl_bus_rx_event(struct mei_cl *cl);
298 void mei_cl_bus_remove_devices(struct mei_device *dev);
299 int mei_cl_bus_init(void);
300 void mei_cl_bus_exit(void);
304 * struct mei_cl_device - MEI device handle
305 * An mei_cl_device pointer is returned from mei_add_device()
306 * and links MEI bus clients to their actual ME host client pointer.
307 * Drivers for MEI devices will get an mei_cl_device pointer
308 * when being probed and shall use it for doing ME bus I/O.
310 * @dev: linux driver model device pointer
311 * @uuid: me client uuid
313 * @ops: ME transport ops
314 * @event_cb: Drivers register this callback to get asynchronous ME
315 * events (e.g. Rx buffer pending) notifications.
316 * @events: Events bitmask sent to the driver.
317 * @priv_data: client private data
319 struct mei_cl_device {
324 const struct mei_cl_ops *ops;
326 struct work_struct event_work;
327 mei_cl_event_cb_t event_cb;
329 unsigned long events;
335 * struct mei_device - MEI private device struct
337 * @reset_count - limits the number of consecutive resets
338 * @hbm_state - state of host bus message protocol
339 * @mem_addr - mem mapped base register address
341 * @hbuf_depth - depth of hardware host/write buffer is slots
342 * @hbuf_is_ready - query if the host host/write buffer is ready
343 * @wr_msg - the buffer for hbm control messages
346 struct pci_dev *pdev; /* pointer to pci device struct */
350 /* array of pointers to aio lists */
351 struct mei_cl_cb read_list; /* driver read queue */
352 struct mei_cl_cb write_list; /* driver write queue */
353 struct mei_cl_cb write_waiting_list; /* write waiting queue */
354 struct mei_cl_cb ctrl_wr_list; /* managed write IOCTL list */
355 struct mei_cl_cb ctrl_rd_list; /* managed read IOCTL list */
360 struct list_head file_list;
361 long open_handle_count;
364 * lock for the device
366 struct mutex device_lock; /* device lock */
367 struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */
371 * waiting queue for receive message from FW
373 wait_queue_head_t wait_hw_ready;
374 wait_queue_head_t wait_recvd_msg;
375 wait_queue_head_t wait_stop_wd;
380 unsigned long reset_count;
381 enum mei_dev_state dev_state;
382 enum mei_hbm_state hbm_state;
383 u16 init_clients_timer;
385 unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* control messages */
392 /* used for control messages */
394 struct mei_msg_hdr hdr;
395 unsigned char data[128];
398 struct hbm_version version;
400 struct mei_me_client *me_clients; /* Note: memory has to be allocated */
401 DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
402 DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
403 unsigned long me_clients_num;
404 unsigned long me_client_presentation_num;
405 unsigned long me_client_index;
408 enum mei_wd_states wd_state;
411 unsigned char wd_data[MEI_WD_START_MSG_SIZE];
414 /* amthif list for cmd waiting */
415 struct mei_cl_cb amthif_cmd_list;
416 /* driver managed amthif list for reading completed amthif cmd data */
417 struct mei_cl_cb amthif_rd_complete_list;
418 struct file *iamthif_file_object;
419 struct mei_cl iamthif_cl;
420 struct mei_cl_cb *iamthif_current_cb;
421 long iamthif_open_count;
423 unsigned long iamthif_timer;
424 u32 iamthif_stall_timer;
425 unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
426 u32 iamthif_msg_buf_size;
427 u32 iamthif_msg_buf_index;
428 enum iamthif_states iamthif_state;
429 bool iamthif_flow_control_pending;
431 bool iamthif_canceled;
433 struct work_struct init_work;
434 struct work_struct reset_work;
436 /* List of bus devices */
437 struct list_head device_list;
439 #if IS_ENABLED(CONFIG_DEBUG_FS)
440 struct dentry *dbgfs_dir;
441 #endif /* CONFIG_DEBUG_FS */
444 const struct mei_hw_ops *ops;
445 char hw[0] __aligned(sizeof(void *));
448 static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
450 return msecs_to_jiffies(sec * MSEC_PER_SEC);
454 * mei_data2slots - get slots - number of (dwords) from a message length
455 * + size of the mei header
456 * @length - size of the messages in bytes
457 * returns - number of slots
459 static inline u32 mei_data2slots(size_t length)
461 return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
465 * mei_slots2data- get data in slots - bytes from slots
466 * @slots - number of available slots
467 * returns - number of bytes in slots
469 static inline u32 mei_slots2data(int slots)
475 * mei init function prototypes
477 void mei_device_init(struct mei_device *dev);
478 int mei_reset(struct mei_device *dev);
479 int mei_start(struct mei_device *dev);
480 int mei_restart(struct mei_device *dev);
481 void mei_stop(struct mei_device *dev);
482 void mei_cancel_work(struct mei_device *dev);
485 * MEI interrupt functions prototype
488 void mei_timer(struct work_struct *work);
489 int mei_irq_read_handler(struct mei_device *dev,
490 struct mei_cl_cb *cmpl_list, s32 *slots);
492 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
493 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
496 * AMTHIF - AMT Host Interface Functions
498 void mei_amthif_reset_params(struct mei_device *dev);
500 int mei_amthif_host_init(struct mei_device *dev);
502 int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
504 int mei_amthif_read(struct mei_device *dev, struct file *file,
505 char __user *ubuf, size_t length, loff_t *offset);
507 unsigned int mei_amthif_poll(struct mei_device *dev,
508 struct file *file, poll_table *wait);
510 int mei_amthif_release(struct mei_device *dev, struct file *file);
512 struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
515 void mei_amthif_run_next_cmd(struct mei_device *dev);
517 int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
518 struct mei_cl_cb *cmpl_list);
520 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
521 int mei_amthif_irq_read_msg(struct mei_device *dev,
522 struct mei_msg_hdr *mei_hdr,
523 struct mei_cl_cb *complete_list);
524 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
529 int mei_nfc_host_init(struct mei_device *dev);
530 void mei_nfc_host_exit(struct mei_device *dev);
535 extern const uuid_le mei_nfc_guid;
537 int mei_wd_send(struct mei_device *dev);
538 int mei_wd_stop(struct mei_device *dev);
539 int mei_wd_host_init(struct mei_device *dev);
541 * mei_watchdog_register - Registering watchdog interface
542 * once we got connection to the WD Client
545 int mei_watchdog_register(struct mei_device *dev);
547 * mei_watchdog_unregister - Unregistering watchdog interface
550 void mei_watchdog_unregister(struct mei_device *dev);
553 * Register Access Function
556 static inline void mei_hw_config(struct mei_device *dev)
558 dev->ops->hw_config(dev);
560 static inline int mei_hw_reset(struct mei_device *dev, bool enable)
562 return dev->ops->hw_reset(dev, enable);
565 static inline int mei_hw_start(struct mei_device *dev)
567 return dev->ops->hw_start(dev);
570 static inline void mei_clear_interrupts(struct mei_device *dev)
572 dev->ops->intr_clear(dev);
575 static inline void mei_enable_interrupts(struct mei_device *dev)
577 dev->ops->intr_enable(dev);
580 static inline void mei_disable_interrupts(struct mei_device *dev)
582 dev->ops->intr_disable(dev);
585 static inline bool mei_host_is_ready(struct mei_device *dev)
587 return dev->ops->host_is_ready(dev);
589 static inline bool mei_hw_is_ready(struct mei_device *dev)
591 return dev->ops->hw_is_ready(dev);
594 static inline bool mei_hbuf_is_ready(struct mei_device *dev)
596 return dev->ops->hbuf_is_ready(dev);
599 static inline int mei_hbuf_empty_slots(struct mei_device *dev)
601 return dev->ops->hbuf_free_slots(dev);
604 static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
606 return dev->ops->hbuf_max_len(dev);
609 static inline int mei_write_message(struct mei_device *dev,
610 struct mei_msg_hdr *hdr,
613 return dev->ops->write(dev, hdr, buf);
616 static inline u32 mei_read_hdr(const struct mei_device *dev)
618 return dev->ops->read_hdr(dev);
621 static inline void mei_read_slots(struct mei_device *dev,
622 unsigned char *buf, unsigned long len)
624 dev->ops->read(dev, buf, len);
627 static inline int mei_count_full_read_slots(struct mei_device *dev)
629 return dev->ops->rdbuf_full_slots(dev);
632 bool mei_hbuf_acquire(struct mei_device *dev);
634 #if IS_ENABLED(CONFIG_DEBUG_FS)
635 int mei_dbgfs_register(struct mei_device *dev, const char *name);
636 void mei_dbgfs_deregister(struct mei_device *dev);
638 static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
642 static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
643 #endif /* CONFIG_DEBUG_FS */
645 int mei_register(struct mei_device *dev);
646 void mei_deregister(struct mei_device *dev);
648 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d internal=%1d comp=%1d"
649 #define MEI_HDR_PRM(hdr) \
650 (hdr)->host_addr, (hdr)->me_addr, \
651 (hdr)->length, (hdr)->internal, (hdr)->msg_complete