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>
27 #include "hw-me-regs.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 * Watchdog independence state message
60 extern const u8 mei_wd_state_independence_msg[3][4];
63 * Number of Maximum MEI Clients
65 #define MEI_CLIENTS_MAX 256
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 Messags
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 /* init clients states*/
108 enum mei_init_clients_states {
109 MEI_START_MESSAGE = 0,
110 MEI_ENUM_CLIENTS_MESSAGE,
111 MEI_CLIENT_PROPERTIES_MESSAGE
114 enum iamthif_states {
117 MEI_IAMTHIF_FLOW_CONTROL,
119 MEI_IAMTHIF_READ_COMPLETE
122 enum mei_file_transaction_states {
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
145 enum mei_cb_file_ops {
154 * Intel MEI message data struct
156 struct mei_msg_data {
162 * struct mei_me_client - representation of me (fw) client
164 * @props - client properties
165 * @client_id - me client id
166 * @mei_flow_ctrl_creds - flow control credits
168 struct mei_me_client {
169 struct mei_client_properties props;
171 u8 mei_flow_ctrl_creds;
178 * struct mei_cl_cb - file operation callback structure
180 * @cl - file client who is running this operation
181 * @fop_type - file operation type
184 struct list_head list;
186 enum mei_cb_file_ops fop_type;
187 struct mei_msg_data request_buffer;
188 struct mei_msg_data response_buffer;
189 unsigned long buf_idx;
190 unsigned long read_time;
191 struct file *file_object;
194 /* MEI client instance carried as file->pirvate_data*/
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;
203 /* ID of client connected */
206 u8 mei_flow_ctrl_creds;
208 enum mei_file_transaction_states reading_state;
209 enum mei_file_transaction_states writing_state;
211 struct mei_cl_cb *read_cb;
213 /* MEI CL bus data */
214 struct mei_cl_device *device;
215 struct list_head device_link;
219 /** struct mei_hw_ops
221 * @host_is_ready - query for host readiness
223 * @hw_is_ready - query if hw is ready
224 * @hw_reset - reset hw
225 * @hw_start - start hw after reset
226 * @hw_config - configure hw
228 * @intr_clear - clear pending interrupts
229 * @intr_enable - enable interrupts
230 * @intr_disable - disable interrupts
232 * @hbuf_free_slots - query for write buffer empty slots
233 * @hbuf_is_ready - query if write buffer is empty
234 * @hbuf_max_len - query for write buffer max len
236 * @write - write a message to FW
238 * @rdbuf_full_slots - query how many slots are filled
240 * @read_hdr - get first 4 bytes (header)
241 * @read - read a buffer from the FW
245 bool (*host_is_ready) (struct mei_device *dev);
247 bool (*hw_is_ready) (struct mei_device *dev);
248 void (*hw_reset) (struct mei_device *dev, bool enable);
249 int (*hw_start) (struct mei_device *dev);
250 void (*hw_config) (struct mei_device *dev);
252 void (*intr_clear) (struct mei_device *dev);
253 void (*intr_enable) (struct mei_device *dev);
254 void (*intr_disable) (struct mei_device *dev);
256 int (*hbuf_free_slots) (struct mei_device *dev);
257 bool (*hbuf_is_ready) (struct mei_device *dev);
258 size_t (*hbuf_max_len) (const struct mei_device *dev);
260 int (*write)(struct mei_device *dev,
261 struct mei_msg_hdr *hdr,
264 int (*rdbuf_full_slots)(struct mei_device *dev);
266 u32 (*read_hdr)(const struct mei_device *dev);
267 int (*read) (struct mei_device *dev,
268 unsigned char *buf, unsigned long len);
274 * struct mei_cl_ops - MEI CL device ops
275 * This structure allows ME host clients to implement technology
276 * specific operations.
278 * @enable: Enable an MEI CL device. Some devices require specific
279 * HECI commands to initialize completely.
280 * @disable: Disable an MEI CL device.
281 * @send: Tx hook for the device. This allows ME host clients to trap
282 * the device driver buffers before actually physically
283 * pushing it to the ME.
284 * @recv: Rx hook for the device. This allows ME host clients to trap the
285 * ME buffers before forwarding them to the device driver.
288 int (*enable)(struct mei_cl_device *device);
289 int (*disable)(struct mei_cl_device *device);
290 int (*send)(struct mei_cl_device *device, u8 *buf, size_t length);
291 int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length);
294 struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
295 uuid_le uuid, char *name,
296 struct mei_cl_ops *ops);
297 void mei_cl_remove_device(struct mei_cl_device *device);
299 int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
300 int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
301 int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
302 void mei_cl_bus_rx_event(struct mei_cl *cl);
303 int mei_cl_bus_init(void);
304 void mei_cl_bus_exit(void);
308 * struct mei_cl_device - MEI device handle
309 * An mei_cl_device pointer is returned from mei_add_device()
310 * and links MEI bus clients to their actual ME host client pointer.
311 * Drivers for MEI devices will get an mei_cl_device pointer
312 * when being probed and shall use it for doing ME bus I/O.
314 * @dev: linux driver model device pointer
315 * @uuid: me client uuid
317 * @ops: ME transport ops
318 * @event_cb: Drivers register this callback to get asynchronous ME
319 * events (e.g. Rx buffer pending) notifications.
320 * @events: Events bitmask sent to the driver.
321 * @priv_data: client private data
323 struct mei_cl_device {
328 const struct mei_cl_ops *ops;
330 struct work_struct event_work;
331 mei_cl_event_cb_t event_cb;
333 unsigned long events;
339 * struct mei_device - MEI private device struct
341 * @mem_addr - mem mapped base register address
343 * @hbuf_depth - depth of hardware host/write buffer is slots
344 * @hbuf_is_ready - query if the host host/write buffer is ready
345 * @wr_msg - the buffer for hbm control messages
346 * @wr_ext_msg - the buffer for hbm control responses (set in read cycle)
349 struct pci_dev *pdev; /* pointer to pci device struct */
353 /* array of pointers to aio lists */
354 struct mei_cl_cb read_list; /* driver read queue */
355 struct mei_cl_cb write_list; /* driver write queue */
356 struct mei_cl_cb write_waiting_list; /* write waiting queue */
357 struct mei_cl_cb ctrl_wr_list; /* managed write IOCTL list */
358 struct mei_cl_cb ctrl_rd_list; /* managed read IOCTL list */
363 struct list_head file_list;
364 long open_handle_count;
367 * lock for the device
369 struct mutex device_lock; /* device lock */
370 struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */
376 * waiting queue for receive message from FW
378 wait_queue_head_t wait_hw_ready;
379 wait_queue_head_t wait_recvd_msg;
380 wait_queue_head_t wait_stop_wd;
385 enum mei_dev_state dev_state;
386 enum mei_init_clients_states init_clients_state;
387 u16 init_clients_timer;
389 unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* control messages */
396 /* used for control messages */
398 struct mei_msg_hdr hdr;
399 unsigned char data[128];
403 struct mei_msg_hdr hdr;
404 unsigned char data[4]; /* All HBM messages are 4 bytes */
405 } wr_ext_msg; /* for control responses */
407 struct hbm_version version;
409 struct mei_me_client *me_clients; /* Note: memory has to be allocated */
410 DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
411 DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
413 u8 me_client_presentation_num;
417 enum mei_wd_states wd_state;
420 unsigned char wd_data[MEI_WD_START_MSG_SIZE];
423 /* amthif list for cmd waiting */
424 struct mei_cl_cb amthif_cmd_list;
425 /* driver managed amthif list for reading completed amthif cmd data */
426 struct mei_cl_cb amthif_rd_complete_list;
427 struct file *iamthif_file_object;
428 struct mei_cl iamthif_cl;
429 struct mei_cl_cb *iamthif_current_cb;
431 unsigned long iamthif_timer;
432 u32 iamthif_stall_timer;
433 unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
434 u32 iamthif_msg_buf_size;
435 u32 iamthif_msg_buf_index;
436 enum iamthif_states iamthif_state;
437 bool iamthif_flow_control_pending;
439 bool iamthif_canceled;
441 struct work_struct init_work;
443 /* List of bus devices */
444 struct list_head device_list;
446 #if IS_ENABLED(CONFIG_DEBUG_FS)
447 struct dentry *dbgfs_dir;
448 #endif /* CONFIG_DEBUG_FS */
451 const struct mei_hw_ops *ops;
452 char hw[0] __aligned(sizeof(void *));
455 static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
457 return msecs_to_jiffies(sec * MSEC_PER_SEC);
461 * mei_data2slots - get slots - number of (dwords) from a message length
462 * + size of the mei header
463 * @length - size of the messages in bytes
464 * returns - number of slots
466 static inline u32 mei_data2slots(size_t length)
468 return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
472 * mei init function prototypes
474 void mei_device_init(struct mei_device *dev);
475 void mei_reset(struct mei_device *dev, int interrupts);
476 int mei_start(struct mei_device *dev);
477 void mei_stop(struct mei_device *dev);
480 * MEI interrupt functions prototype
483 void mei_timer(struct work_struct *work);
484 int mei_irq_read_handler(struct mei_device *dev,
485 struct mei_cl_cb *cmpl_list, s32 *slots);
487 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
488 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
491 * AMTHIF - AMT Host Interface Functions
493 void mei_amthif_reset_params(struct mei_device *dev);
495 int mei_amthif_host_init(struct mei_device *dev);
497 int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
499 int mei_amthif_read(struct mei_device *dev, struct file *file,
500 char __user *ubuf, size_t length, loff_t *offset);
502 unsigned int mei_amthif_poll(struct mei_device *dev,
503 struct file *file, poll_table *wait);
505 int mei_amthif_release(struct mei_device *dev, struct file *file);
507 struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
510 void mei_amthif_run_next_cmd(struct mei_device *dev);
513 int mei_amthif_irq_write_complete(struct mei_device *dev, s32 *slots,
514 struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list);
516 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
517 int mei_amthif_irq_read_message(struct mei_cl_cb *complete_list,
518 struct mei_device *dev, struct mei_msg_hdr *mei_hdr);
519 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
522 int mei_wd_send(struct mei_device *dev);
523 int mei_wd_stop(struct mei_device *dev);
524 int mei_wd_host_init(struct mei_device *dev);
526 * mei_watchdog_register - Registering watchdog interface
527 * once we got connection to the WD Client
530 void mei_watchdog_register(struct mei_device *dev);
532 * mei_watchdog_unregister - Unregistering watchdog interface
535 void mei_watchdog_unregister(struct mei_device *dev);
538 * Register Access Function
541 static inline void mei_hw_config(struct mei_device *dev)
543 dev->ops->hw_config(dev);
545 static inline void mei_hw_reset(struct mei_device *dev, bool enable)
547 dev->ops->hw_reset(dev, enable);
550 static inline void mei_hw_start(struct mei_device *dev)
552 dev->ops->hw_start(dev);
555 static inline void mei_clear_interrupts(struct mei_device *dev)
557 dev->ops->intr_clear(dev);
560 static inline void mei_enable_interrupts(struct mei_device *dev)
562 dev->ops->intr_enable(dev);
565 static inline void mei_disable_interrupts(struct mei_device *dev)
567 dev->ops->intr_disable(dev);
570 static inline bool mei_host_is_ready(struct mei_device *dev)
572 return dev->ops->host_is_ready(dev);
574 static inline bool mei_hw_is_ready(struct mei_device *dev)
576 return dev->ops->hw_is_ready(dev);
579 static inline bool mei_hbuf_is_ready(struct mei_device *dev)
581 return dev->ops->hbuf_is_ready(dev);
584 static inline int mei_hbuf_empty_slots(struct mei_device *dev)
586 return dev->ops->hbuf_free_slots(dev);
589 static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
591 return dev->ops->hbuf_max_len(dev);
594 static inline int mei_write_message(struct mei_device *dev,
595 struct mei_msg_hdr *hdr,
598 return dev->ops->write(dev, hdr, buf);
601 static inline u32 mei_read_hdr(const struct mei_device *dev)
603 return dev->ops->read_hdr(dev);
606 static inline void mei_read_slots(struct mei_device *dev,
607 unsigned char *buf, unsigned long len)
609 dev->ops->read(dev, buf, len);
612 static inline int mei_count_full_read_slots(struct mei_device *dev)
614 return dev->ops->rdbuf_full_slots(dev);
617 #if IS_ENABLED(CONFIG_DEBUG_FS)
618 int mei_dbgfs_register(struct mei_device *dev, const char *name);
619 void mei_dbgfs_deregister(struct mei_device *dev);
621 static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
625 static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
626 #endif /* CONFIG_DEBUG_FS */
628 int mei_register(struct mei_device *dev);
629 void mei_deregister(struct mei_device *dev);
631 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"
632 #define MEI_HDR_PRM(hdr) \
633 (hdr)->host_addr, (hdr)->me_addr, \
634 (hdr)->length, (hdr)->msg_complete