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_message_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_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;
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;
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 void (*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);
267 struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
268 uuid_le uuid, char *name);
269 void mei_cl_remove_device(struct mei_cl_device *device);
272 * struct mei_cl_device - MEI device handle
273 * An mei_cl_device pointer is returned from mei_add_device()
274 * and links MEI bus clients to their actual ME host client pointer.
275 * Drivers for MEI devices will get an mei_cl_device pointer
276 * when being probed and shall use it for doing ME bus I/O.
278 * @dev: linux driver model device pointer
279 * @uuid: me client uuid
281 * @priv_data: client private data
283 struct mei_cl_device {
292 * struct mei_device - MEI private device struct
294 * @mem_addr - mem mapped base register address
296 * @hbuf_depth - depth of hardware host/write buffer is slots
297 * @hbuf_is_ready - query if the host host/write buffer is ready
298 * @wr_msg - the buffer for hbm control messages
299 * @wr_ext_msg - the buffer for hbm control responses (set in read cycle)
302 struct pci_dev *pdev; /* pointer to pci device struct */
306 /* array of pointers to aio lists */
307 struct mei_cl_cb read_list; /* driver read queue */
308 struct mei_cl_cb write_list; /* driver write queue */
309 struct mei_cl_cb write_waiting_list; /* write waiting queue */
310 struct mei_cl_cb ctrl_wr_list; /* managed write IOCTL list */
311 struct mei_cl_cb ctrl_rd_list; /* managed read IOCTL list */
316 struct list_head file_list;
317 long open_handle_count;
320 * lock for the device
322 struct mutex device_lock; /* device lock */
323 struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */
329 * waiting queue for receive message from FW
331 wait_queue_head_t wait_hw_ready;
332 wait_queue_head_t wait_recvd_msg;
333 wait_queue_head_t wait_stop_wd;
338 enum mei_dev_state dev_state;
339 enum mei_init_clients_states init_clients_state;
340 u16 init_clients_timer;
342 unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* control messages */
349 /* used for control messages */
351 struct mei_msg_hdr hdr;
352 unsigned char data[128];
356 struct mei_msg_hdr hdr;
357 unsigned char data[4]; /* All HBM messages are 4 bytes */
358 } wr_ext_msg; /* for control responses */
360 struct hbm_version version;
362 struct mei_me_client *me_clients; /* Note: memory has to be allocated */
363 DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
364 DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
366 u8 me_client_presentation_num;
370 enum mei_wd_states wd_state;
373 unsigned char wd_data[MEI_WD_START_MSG_SIZE];
376 /* amthif list for cmd waiting */
377 struct mei_cl_cb amthif_cmd_list;
378 /* driver managed amthif list for reading completed amthif cmd data */
379 struct mei_cl_cb amthif_rd_complete_list;
380 struct file *iamthif_file_object;
381 struct mei_cl iamthif_cl;
382 struct mei_cl_cb *iamthif_current_cb;
384 unsigned long iamthif_timer;
385 u32 iamthif_stall_timer;
386 unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
387 u32 iamthif_msg_buf_size;
388 u32 iamthif_msg_buf_index;
389 enum iamthif_states iamthif_state;
390 bool iamthif_flow_control_pending;
392 bool iamthif_canceled;
394 struct work_struct init_work;
396 const struct mei_hw_ops *ops;
397 char hw[0] __aligned(sizeof(void *));
400 static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
402 return msecs_to_jiffies(sec * MSEC_PER_SEC);
406 * mei_data2slots - get slots - number of (dwords) from a message length
407 * + size of the mei header
408 * @length - size of the messages in bytes
409 * returns - number of slots
411 static inline u32 mei_data2slots(size_t length)
413 return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
418 * mei init function prototypes
420 void mei_device_init(struct mei_device *dev);
421 void mei_reset(struct mei_device *dev, int interrupts);
422 int mei_start(struct mei_device *dev);
423 void mei_stop(struct mei_device *dev);
426 * MEI interrupt functions prototype
429 void mei_timer(struct work_struct *work);
430 int mei_irq_read_handler(struct mei_device *dev,
431 struct mei_cl_cb *cmpl_list, s32 *slots);
433 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
434 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
437 * AMTHIF - AMT Host Interface Functions
439 void mei_amthif_reset_params(struct mei_device *dev);
441 int mei_amthif_host_init(struct mei_device *dev);
443 int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
445 int mei_amthif_read(struct mei_device *dev, struct file *file,
446 char __user *ubuf, size_t length, loff_t *offset);
448 unsigned int mei_amthif_poll(struct mei_device *dev,
449 struct file *file, poll_table *wait);
451 int mei_amthif_release(struct mei_device *dev, struct file *file);
453 struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
456 void mei_amthif_run_next_cmd(struct mei_device *dev);
459 int mei_amthif_irq_write_complete(struct mei_device *dev, s32 *slots,
460 struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list);
462 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
463 int mei_amthif_irq_read_message(struct mei_cl_cb *complete_list,
464 struct mei_device *dev, struct mei_msg_hdr *mei_hdr);
465 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
468 int mei_wd_send(struct mei_device *dev);
469 int mei_wd_stop(struct mei_device *dev);
470 int mei_wd_host_init(struct mei_device *dev);
472 * mei_watchdog_register - Registering watchdog interface
473 * once we got connection to the WD Client
476 void mei_watchdog_register(struct mei_device *dev);
478 * mei_watchdog_unregister - Unregistering watchdog interface
481 void mei_watchdog_unregister(struct mei_device *dev);
484 * Register Access Function
487 static inline void mei_hw_config(struct mei_device *dev)
489 dev->ops->hw_config(dev);
491 static inline void mei_hw_reset(struct mei_device *dev, bool enable)
493 dev->ops->hw_reset(dev, enable);
496 static inline void mei_hw_start(struct mei_device *dev)
498 dev->ops->hw_start(dev);
501 static inline void mei_clear_interrupts(struct mei_device *dev)
503 dev->ops->intr_clear(dev);
506 static inline void mei_enable_interrupts(struct mei_device *dev)
508 dev->ops->intr_enable(dev);
511 static inline void mei_disable_interrupts(struct mei_device *dev)
513 dev->ops->intr_disable(dev);
516 static inline bool mei_host_is_ready(struct mei_device *dev)
518 return dev->ops->host_is_ready(dev);
520 static inline bool mei_hw_is_ready(struct mei_device *dev)
522 return dev->ops->hw_is_ready(dev);
525 static inline bool mei_hbuf_is_ready(struct mei_device *dev)
527 return dev->ops->hbuf_is_ready(dev);
530 static inline int mei_hbuf_empty_slots(struct mei_device *dev)
532 return dev->ops->hbuf_free_slots(dev);
535 static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
537 return dev->ops->hbuf_max_len(dev);
540 static inline int mei_write_message(struct mei_device *dev,
541 struct mei_msg_hdr *hdr,
544 return dev->ops->write(dev, hdr, buf);
547 static inline u32 mei_read_hdr(const struct mei_device *dev)
549 return dev->ops->read_hdr(dev);
552 static inline void mei_read_slots(struct mei_device *dev,
553 unsigned char *buf, unsigned long len)
555 dev->ops->read(dev, buf, len);
558 static inline int mei_count_full_read_slots(struct mei_device *dev)
560 return dev->ops->rdbuf_full_slots(dev);
563 int mei_register(struct device *dev);
564 void mei_deregister(void);
566 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"
567 #define MEI_HDR_PRM(hdr) \
568 (hdr)->host_addr, (hdr)->me_addr, \
569 (hdr)->length, (hdr)->msg_complete