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,
91 MEI_FILE_DISCONNECT_REPLY,
92 MEI_FILE_DISCONNECT_REQUIRED,
93 MEI_FILE_DISCONNECTED,
96 /* MEI device states */
98 MEI_DEV_INITIALIZING = 0,
107 const char *mei_dev_state_str(int state);
109 enum iamthif_states {
112 MEI_IAMTHIF_FLOW_CONTROL,
114 MEI_IAMTHIF_READ_COMPLETE
117 enum mei_file_transaction_states {
133 * enum mei_cb_file_ops - file operation associated with the callback
134 * @MEI_FOP_READ: read
135 * @MEI_FOP_WRITE: write
136 * @MEI_FOP_CONNECT: connect
137 * @MEI_FOP_DISCONNECT: disconnect
138 * @MEI_FOP_DISCONNECT_RSP: disconnect response
140 enum mei_cb_file_ops {
145 MEI_FOP_DISCONNECT_RSP,
149 * Intel MEI message data struct
151 struct mei_msg_data {
156 /* Maximum number of processed FW status registers */
157 #define MEI_FW_STATUS_MAX 6
158 /* Minimal buffer for FW status string (8 bytes in dw + space or '\0') */
159 #define MEI_FW_STATUS_STR_SZ (MEI_FW_STATUS_MAX * (8 + 1))
163 * struct mei_fw_status - storage of FW status data
165 * @count: number of actually available elements in array
166 * @status: FW status registers
168 struct mei_fw_status {
170 u32 status[MEI_FW_STATUS_MAX];
174 * struct mei_me_client - representation of me (fw) client
176 * @list: link in me client list
177 * @refcnt: struct reference count
178 * @props: client properties
179 * @client_id: me client id
180 * @mei_flow_ctrl_creds: flow control credits
181 * @connect_count: number connections to this client
182 * @bus_added: added to bus
184 struct mei_me_client {
185 struct list_head list;
187 struct mei_client_properties props;
189 u8 mei_flow_ctrl_creds;
198 * struct mei_cl_cb - file operation callback structure
200 * @list: link in callback queue
201 * @cl: file client who is running this operation
202 * @fop_type: file operation type
203 * @buf: buffer for data associated with the callback
204 * @buf_idx: last read index
205 * @read_time: last read operation time stamp (iamthif)
206 * @file_object: pointer to file structure
207 * @status: io status of the cb
208 * @internal: communication between driver and FW flag
209 * @completed: the transfer or reception has completed
212 struct list_head list;
214 enum mei_cb_file_ops fop_type;
215 struct mei_msg_data buf;
216 unsigned long buf_idx;
217 unsigned long read_time;
218 struct file *file_object;
225 * struct mei_cl - me client host representation
226 * carried in file->private_data
228 * @link: link in the clients list
229 * @dev: mei parent device
230 * @state: file operation state
231 * @tx_wait: wait queue for tx completion
232 * @rx_wait: wait queue for rx completion
233 * @wait: wait queue for management operation
234 * @status: connection status
235 * @me_cl: fw client connected
236 * @host_client_id: host id
237 * @mei_flow_ctrl_creds: transmit flow credentials
238 * @timer_count: watchdog timer for operation completion
239 * @reserved: reserved for alignment
240 * @writing_state: state of the tx
241 * @rd_pending: pending read credits
242 * @rd_completed: completed read
244 * @cldev: device on the mei client bus
247 struct list_head link;
248 struct mei_device *dev;
249 enum file_state state;
250 wait_queue_head_t tx_wait;
251 wait_queue_head_t rx_wait;
252 wait_queue_head_t wait;
254 struct mei_me_client *me_cl;
256 u8 mei_flow_ctrl_creds;
259 enum mei_file_transaction_states writing_state;
260 struct list_head rd_pending;
261 struct list_head rd_completed;
263 struct mei_cl_device *cldev;
266 /** struct mei_hw_ops
268 * @host_is_ready : query for host readiness
270 * @hw_is_ready : query if hw is ready
271 * @hw_reset : reset hw
272 * @hw_start : start hw after reset
273 * @hw_config : configure hw
275 * @fw_status : get fw status registers
276 * @pg_state : power gating state of the device
277 * @pg_in_transition : is device now in pg transition
278 * @pg_is_enabled : is power gating enabled
280 * @intr_clear : clear pending interrupts
281 * @intr_enable : enable interrupts
282 * @intr_disable : disable interrupts
284 * @hbuf_free_slots : query for write buffer empty slots
285 * @hbuf_is_ready : query if write buffer is empty
286 * @hbuf_max_len : query for write buffer max len
288 * @write : write a message to FW
290 * @rdbuf_full_slots : query how many slots are filled
292 * @read_hdr : get first 4 bytes (header)
293 * @read : read a buffer from the FW
297 bool (*host_is_ready)(struct mei_device *dev);
299 bool (*hw_is_ready)(struct mei_device *dev);
300 int (*hw_reset)(struct mei_device *dev, bool enable);
301 int (*hw_start)(struct mei_device *dev);
302 void (*hw_config)(struct mei_device *dev);
305 int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts);
306 enum mei_pg_state (*pg_state)(struct mei_device *dev);
307 bool (*pg_in_transition)(struct mei_device *dev);
308 bool (*pg_is_enabled)(struct mei_device *dev);
310 void (*intr_clear)(struct mei_device *dev);
311 void (*intr_enable)(struct mei_device *dev);
312 void (*intr_disable)(struct mei_device *dev);
314 int (*hbuf_free_slots)(struct mei_device *dev);
315 bool (*hbuf_is_ready)(struct mei_device *dev);
316 size_t (*hbuf_max_len)(const struct mei_device *dev);
318 int (*write)(struct mei_device *dev,
319 struct mei_msg_hdr *hdr,
322 int (*rdbuf_full_slots)(struct mei_device *dev);
324 u32 (*read_hdr)(const struct mei_device *dev);
325 int (*read)(struct mei_device *dev,
326 unsigned char *buf, unsigned long len);
330 void mei_cl_bus_rescan(struct mei_device *bus);
331 void mei_cl_dev_fixup(struct mei_cl_device *dev);
332 ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
334 ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
335 void mei_cl_bus_rx_event(struct mei_cl *cl);
336 void mei_cl_bus_remove_devices(struct mei_device *bus);
337 int mei_cl_bus_init(void);
338 void mei_cl_bus_exit(void);
341 * enum mei_pg_event - power gating transition events
343 * @MEI_PG_EVENT_IDLE: the driver is not in power gating transition
344 * @MEI_PG_EVENT_WAIT: the driver is waiting for a pg event to complete
345 * @MEI_PG_EVENT_RECEIVED: the driver received pg event
346 * @MEI_PG_EVENT_INTR_WAIT: the driver is waiting for a pg event interrupt
347 * @MEI_PG_EVENT_INTR_RECEIVED: the driver received pg event interrupt
352 MEI_PG_EVENT_RECEIVED,
353 MEI_PG_EVENT_INTR_WAIT,
354 MEI_PG_EVENT_INTR_RECEIVED,
358 * enum mei_pg_state - device internal power gating state
360 * @MEI_PG_OFF: device is not power gated - it is active
361 * @MEI_PG_ON: device is power gated - it is in lower power state
368 const char *mei_pg_state_str(enum mei_pg_state state);
371 * struct mei_device - MEI private device struct
373 * @dev : device on a bus
374 * @cdev : character device
375 * @minor : minor number allocated for device
377 * @write_list : write pending list
378 * @write_waiting_list : write completion list
379 * @ctrl_wr_list : pending control write list
380 * @ctrl_rd_list : pending control read list
382 * @file_list : list of opened handles
383 * @open_handle_count: number of opened handles
385 * @device_lock : big device lock
386 * @timer_work : MEI timer delayed work (timeouts)
388 * @recvd_hw_ready : hw ready message received flag
390 * @wait_hw_ready : wait queue for receive HW ready message form FW
391 * @wait_pg : wait queue for receive PG message from FW
392 * @wait_hbm_start : wait queue for receive HBM start message from FW
393 * @wait_stop_wd : wait queue for receive WD stop message from FW
395 * @reset_count : number of consecutive resets
396 * @dev_state : device state
397 * @hbm_state : state of host bus message protocol
398 * @init_clients_timer : HBM init handshake timeout
400 * @pg_event : power gating event
401 * @pg_domain : runtime PM domain
403 * @rd_msg_buf : control messages buffer
404 * @rd_msg_hdr : read message header storage
406 * @hbuf_depth : depth of hardware host/write buffer is slots
407 * @hbuf_is_ready : query if the host host/write buffer is ready
408 * @wr_msg : the buffer for hbm control messages
410 * @version : HBM protocol version in use
411 * @hbm_f_pg_supported : hbm feature pgi protocol
412 * @hbm_f_dc_supported : hbm feature dynamic clients
413 * @hbm_f_dot_supported : hbm feature disconnect on timeout
415 * @me_clients_rwsem: rw lock over me_clients list
416 * @me_clients : list of FW clients
417 * @me_clients_map : FW clients bit map
418 * @host_clients_map : host clients id pool
419 * @me_client_index : last FW client index in enumeration
421 * @allow_fixed_address: allow user space to connect a fixed client
423 * @wd_cl : watchdog client
424 * @wd_state : watchdog client state
425 * @wd_pending : watchdog command is pending
426 * @wd_timeout : watchdog expiration timeout
427 * @wd_data : watchdog message buffer
429 * @amthif_cmd_list : amthif list for cmd waiting
430 * @amthif_rd_complete_list : amthif list for reading completed cmd data
431 * @iamthif_file_object : file for current amthif operation
432 * @iamthif_cl : amthif host client
433 * @iamthif_current_cb : amthif current operation callback
434 * @iamthif_open_count : number of opened amthif connections
435 * @iamthif_timer : time stamp of current amthif command completion
436 * @iamthif_stall_timer : timer to detect amthif hang
437 * @iamthif_state : amthif processor state
438 * @iamthif_canceled : current amthif command is canceled
440 * @init_work : work item for the device init
441 * @reset_work : work item for the device reset
443 * @device_list : mei client bus list
444 * @cl_bus_lock : client bus list lock
446 * @dbgfs_dir : debugfs mei root directory
448 * @ops: : hw specific operations
449 * @hw : hw specific data
456 struct mei_cl_cb write_list;
457 struct mei_cl_cb write_waiting_list;
458 struct mei_cl_cb ctrl_wr_list;
459 struct mei_cl_cb ctrl_rd_list;
461 struct list_head file_list;
462 long open_handle_count;
464 struct mutex device_lock;
465 struct delayed_work timer_work;
469 * waiting queue for receive message from FW
471 wait_queue_head_t wait_hw_ready;
472 wait_queue_head_t wait_pg;
473 wait_queue_head_t wait_hbm_start;
474 wait_queue_head_t wait_stop_wd;
479 unsigned long reset_count;
480 enum mei_dev_state dev_state;
481 enum mei_hbm_state hbm_state;
482 u16 init_clients_timer;
485 * Power Gating support
487 enum mei_pg_event pg_event;
489 struct dev_pm_domain pg_domain;
490 #endif /* CONFIG_PM */
492 unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE];
499 /* used for control messages */
501 struct mei_msg_hdr hdr;
502 unsigned char data[128];
505 struct hbm_version version;
506 unsigned int hbm_f_pg_supported:1;
507 unsigned int hbm_f_dc_supported:1;
508 unsigned int hbm_f_dot_supported:1;
510 struct rw_semaphore me_clients_rwsem;
511 struct list_head me_clients;
512 DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
513 DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
514 unsigned long me_client_index;
516 u32 allow_fixed_address;
519 enum mei_wd_states wd_state;
522 unsigned char wd_data[MEI_WD_START_MSG_SIZE];
525 /* amthif list for cmd waiting */
526 struct mei_cl_cb amthif_cmd_list;
527 /* driver managed amthif list for reading completed amthif cmd data */
528 struct mei_cl_cb amthif_rd_complete_list;
529 struct file *iamthif_file_object;
530 struct mei_cl iamthif_cl;
531 struct mei_cl_cb *iamthif_current_cb;
532 long iamthif_open_count;
533 unsigned long iamthif_timer;
534 u32 iamthif_stall_timer;
535 enum iamthif_states iamthif_state;
536 bool iamthif_canceled;
538 struct work_struct init_work;
539 struct work_struct reset_work;
541 /* List of bus devices */
542 struct list_head device_list;
543 struct mutex cl_bus_lock;
545 #if IS_ENABLED(CONFIG_DEBUG_FS)
546 struct dentry *dbgfs_dir;
547 #endif /* CONFIG_DEBUG_FS */
550 const struct mei_hw_ops *ops;
551 char hw[0] __aligned(sizeof(void *));
554 static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
556 return msecs_to_jiffies(sec * MSEC_PER_SEC);
560 * mei_data2slots - get slots - number of (dwords) from a message length
561 * + size of the mei header
563 * @length: size of the messages in bytes
565 * Return: number of slots
567 static inline u32 mei_data2slots(size_t length)
569 return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
573 * mei_slots2data - get data in slots - bytes from slots
575 * @slots: number of available slots
577 * Return: number of bytes in slots
579 static inline u32 mei_slots2data(int slots)
585 * mei init function prototypes
587 void mei_device_init(struct mei_device *dev,
588 struct device *device,
589 const struct mei_hw_ops *hw_ops);
590 int mei_reset(struct mei_device *dev);
591 int mei_start(struct mei_device *dev);
592 int mei_restart(struct mei_device *dev);
593 void mei_stop(struct mei_device *dev);
594 void mei_cancel_work(struct mei_device *dev);
597 * MEI interrupt functions prototype
600 void mei_timer(struct work_struct *work);
601 int mei_irq_read_handler(struct mei_device *dev,
602 struct mei_cl_cb *cmpl_list, s32 *slots);
604 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
605 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
608 * AMTHIF - AMT Host Interface Functions
610 void mei_amthif_reset_params(struct mei_device *dev);
612 int mei_amthif_host_init(struct mei_device *dev, struct mei_me_client *me_cl);
614 int mei_amthif_read(struct mei_device *dev, struct file *file,
615 char __user *ubuf, size_t length, loff_t *offset);
617 unsigned int mei_amthif_poll(struct mei_device *dev,
618 struct file *file, poll_table *wait);
620 int mei_amthif_release(struct mei_device *dev, struct file *file);
622 struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
625 int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb);
626 int mei_amthif_run_next_cmd(struct mei_device *dev);
627 int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
628 struct mei_cl_cb *cmpl_list);
630 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
631 int mei_amthif_irq_read_msg(struct mei_cl *cl,
632 struct mei_msg_hdr *mei_hdr,
633 struct mei_cl_cb *complete_list);
634 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
639 int mei_nfc_host_init(struct mei_device *dev, struct mei_me_client *me_cl);
640 void mei_nfc_host_exit(struct mei_device *dev);
645 extern const uuid_le mei_nfc_guid;
647 int mei_wd_send(struct mei_device *dev);
648 int mei_wd_stop(struct mei_device *dev);
649 int mei_wd_host_init(struct mei_device *dev, struct mei_me_client *me_cl);
651 * mei_watchdog_register - Registering watchdog interface
652 * once we got connection to the WD Client
655 int mei_watchdog_register(struct mei_device *dev);
657 * mei_watchdog_unregister - Unregistering watchdog interface
660 void mei_watchdog_unregister(struct mei_device *dev);
663 * Register Access Function
667 static inline void mei_hw_config(struct mei_device *dev)
669 dev->ops->hw_config(dev);
672 static inline enum mei_pg_state mei_pg_state(struct mei_device *dev)
674 return dev->ops->pg_state(dev);
677 static inline bool mei_pg_in_transition(struct mei_device *dev)
679 return dev->ops->pg_in_transition(dev);
682 static inline bool mei_pg_is_enabled(struct mei_device *dev)
684 return dev->ops->pg_is_enabled(dev);
687 static inline int mei_hw_reset(struct mei_device *dev, bool enable)
689 return dev->ops->hw_reset(dev, enable);
692 static inline int mei_hw_start(struct mei_device *dev)
694 return dev->ops->hw_start(dev);
697 static inline void mei_clear_interrupts(struct mei_device *dev)
699 dev->ops->intr_clear(dev);
702 static inline void mei_enable_interrupts(struct mei_device *dev)
704 dev->ops->intr_enable(dev);
707 static inline void mei_disable_interrupts(struct mei_device *dev)
709 dev->ops->intr_disable(dev);
712 static inline bool mei_host_is_ready(struct mei_device *dev)
714 return dev->ops->host_is_ready(dev);
716 static inline bool mei_hw_is_ready(struct mei_device *dev)
718 return dev->ops->hw_is_ready(dev);
721 static inline bool mei_hbuf_is_ready(struct mei_device *dev)
723 return dev->ops->hbuf_is_ready(dev);
726 static inline int mei_hbuf_empty_slots(struct mei_device *dev)
728 return dev->ops->hbuf_free_slots(dev);
731 static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
733 return dev->ops->hbuf_max_len(dev);
736 static inline int mei_write_message(struct mei_device *dev,
737 struct mei_msg_hdr *hdr,
740 return dev->ops->write(dev, hdr, buf);
743 static inline u32 mei_read_hdr(const struct mei_device *dev)
745 return dev->ops->read_hdr(dev);
748 static inline void mei_read_slots(struct mei_device *dev,
749 unsigned char *buf, unsigned long len)
751 dev->ops->read(dev, buf, len);
754 static inline int mei_count_full_read_slots(struct mei_device *dev)
756 return dev->ops->rdbuf_full_slots(dev);
759 static inline int mei_fw_status(struct mei_device *dev,
760 struct mei_fw_status *fw_status)
762 return dev->ops->fw_status(dev, fw_status);
765 bool mei_hbuf_acquire(struct mei_device *dev);
767 bool mei_write_is_idle(struct mei_device *dev);
769 #if IS_ENABLED(CONFIG_DEBUG_FS)
770 int mei_dbgfs_register(struct mei_device *dev, const char *name);
771 void mei_dbgfs_deregister(struct mei_device *dev);
773 static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
777 static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
778 #endif /* CONFIG_DEBUG_FS */
780 int mei_register(struct mei_device *dev, struct device *parent);
781 void mei_deregister(struct mei_device *dev);
783 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d internal=%1d comp=%1d"
784 #define MEI_HDR_PRM(hdr) \
785 (hdr)->host_addr, (hdr)->me_addr, \
786 (hdr)->length, (hdr)->internal, (hdr)->msg_complete
788 ssize_t mei_fw_status2str(struct mei_fw_status *fw_sts, char *buf, size_t len);
790 * mei_fw_status_str - fetch and convert fw status registers to printable string
792 * @dev: the device structure
793 * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ
794 * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ
796 * Return: number of bytes written or < 0 on failure
798 static inline ssize_t mei_fw_status_str(struct mei_device *dev,
799 char *buf, size_t len)
801 struct mei_fw_status fw_status;
806 ret = mei_fw_status(dev, &fw_status);
810 ret = mei_fw_status2str(&fw_status, buf, MEI_FW_STATUS_STR_SZ);