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>
26 #include "hw-me-regs.h"
29 * watch dog definition
31 #define MEI_WD_HDR_SIZE 4
32 #define MEI_WD_STOP_MSG_SIZE MEI_WD_HDR_SIZE
33 #define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16)
35 #define MEI_WD_DEFAULT_TIMEOUT 120 /* seconds */
36 #define MEI_WD_MIN_TIMEOUT 120 /* seconds */
37 #define MEI_WD_MAX_TIMEOUT 65535 /* seconds */
39 #define MEI_WD_STOP_TIMEOUT 10 /* msecs */
41 #define MEI_WD_STATE_INDEPENDENCE_MSG_SENT (1 << 0)
43 #define MEI_RD_MSG_BUF_SIZE (128 * sizeof(u32))
49 extern const uuid_le mei_amthif_guid
;
52 * Watchdog Client UUID
54 extern const uuid_le mei_wd_guid
;
57 * Watchdog independence state message
59 extern const u8 mei_wd_state_independence_msg
[3][4];
62 * Number of Maximum MEI Clients
64 #define MEI_CLIENTS_MAX 256
67 * Number of File descriptors/handles
68 * that can be opened to the driver.
70 * Limit to 255: 256 Total Clients
71 * minus internal client for MEI Bus Messags
73 #define MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)
76 * Internal Clients Number
78 #define MEI_HOST_CLIENT_ID_ANY (-1)
79 #define MEI_HBM_HOST_CLIENT_ID 0 /* not used, just for documentation */
80 #define MEI_WD_HOST_CLIENT_ID 1
81 #define MEI_IAMTHIF_HOST_CLIENT_ID 2
86 MEI_FILE_INITIALIZING
= 0,
89 MEI_FILE_DISCONNECTING
,
93 /* MEI device states */
95 MEI_DEV_INITIALIZING
= 0,
100 MEI_DEV_RECOVERING_FROM_RESET
,
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_set_ready - notify FW that host side is ready
217 * @host_is_ready - query for host readiness
219 * @hw_is_ready - query if hw is ready
220 * @hw_reset - reset hw
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 void (*host_set_ready
) (struct mei_device
*dev
);
241 bool (*host_is_ready
) (struct mei_device
*dev
);
243 bool (*hw_is_ready
) (struct mei_device
*dev
);
244 void (*hw_reset
) (struct mei_device
*dev
, bool enable
);
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_device - MEI private device struct
269 * @mem_addr - mem mapped base register address
271 * @hbuf_depth - depth of hardware host/write buffer is slots
272 * @hbuf_is_ready - query if the host host/write buffer is ready
273 * @wr_msg - the buffer for hbm control messages
274 * @wr_ext_msg - the buffer for hbm control responses (set in read cycle)
277 struct pci_dev
*pdev
; /* pointer to pci device struct */
281 /* array of pointers to aio lists */
282 struct mei_cl_cb read_list
; /* driver read queue */
283 struct mei_cl_cb write_list
; /* driver write queue */
284 struct mei_cl_cb write_waiting_list
; /* write waiting queue */
285 struct mei_cl_cb ctrl_wr_list
; /* managed write IOCTL list */
286 struct mei_cl_cb ctrl_rd_list
; /* managed read IOCTL list */
291 struct list_head file_list
;
292 long open_handle_count
;
295 * lock for the device
297 struct mutex device_lock
; /* device lock */
298 struct delayed_work timer_work
; /* MEI timer delayed work (timeouts) */
302 * waiting queue for receive message from FW
304 wait_queue_head_t wait_recvd_msg
;
305 wait_queue_head_t wait_stop_wd
;
310 enum mei_dev_state dev_state
;
311 enum mei_init_clients_states init_clients_state
;
312 u16 init_clients_timer
;
314 unsigned char rd_msg_buf
[MEI_RD_MSG_BUF_SIZE
]; /* control messages */
321 /* used for control messages */
323 struct mei_msg_hdr hdr
;
324 unsigned char data
[128];
328 struct mei_msg_hdr hdr
;
329 unsigned char data
[4]; /* All HBM messages are 4 bytes */
330 } wr_ext_msg
; /* for control responses */
332 struct hbm_version version
;
334 struct mei_me_client
*me_clients
; /* Note: memory has to be allocated */
335 DECLARE_BITMAP(me_clients_map
, MEI_CLIENTS_MAX
);
336 DECLARE_BITMAP(host_clients_map
, MEI_CLIENTS_MAX
);
338 u8 me_client_presentation_num
;
342 enum mei_wd_states wd_state
;
345 unsigned char wd_data
[MEI_WD_START_MSG_SIZE
];
348 /* amthif list for cmd waiting */
349 struct mei_cl_cb amthif_cmd_list
;
350 /* driver managed amthif list for reading completed amthif cmd data */
351 struct mei_cl_cb amthif_rd_complete_list
;
352 struct file
*iamthif_file_object
;
353 struct mei_cl iamthif_cl
;
354 struct mei_cl_cb
*iamthif_current_cb
;
356 unsigned long iamthif_timer
;
357 u32 iamthif_stall_timer
;
358 unsigned char *iamthif_msg_buf
; /* Note: memory has to be allocated */
359 u32 iamthif_msg_buf_size
;
360 u32 iamthif_msg_buf_index
;
361 enum iamthif_states iamthif_state
;
362 bool iamthif_flow_control_pending
;
364 bool iamthif_canceled
;
366 struct work_struct init_work
;
368 const struct mei_hw_ops
*ops
;
369 char hw
[0] __aligned(sizeof(void *));
372 static inline unsigned long mei_secs_to_jiffies(unsigned long sec
)
374 return msecs_to_jiffies(sec
* MSEC_PER_SEC
);
379 * mei init function prototypes
381 void mei_device_init(struct mei_device
*dev
);
382 void mei_reset(struct mei_device
*dev
, int interrupts
);
383 int mei_hw_init(struct mei_device
*dev
);
386 * MEI interrupt functions prototype
389 void mei_timer(struct work_struct
*work
);
390 int mei_irq_read_handler(struct mei_device
*dev
,
391 struct mei_cl_cb
*cmpl_list
, s32
*slots
);
393 int mei_irq_write_handler(struct mei_device
*dev
, struct mei_cl_cb
*cmpl_list
);
395 void mei_irq_complete_handler(struct mei_cl
*cl
, struct mei_cl_cb
*cb_pos
);
398 * AMTHIF - AMT Host Interface Functions
400 void mei_amthif_reset_params(struct mei_device
*dev
);
402 int mei_amthif_host_init(struct mei_device
*dev
);
404 int mei_amthif_write(struct mei_device
*dev
, struct mei_cl_cb
*priv_cb
);
406 int mei_amthif_read(struct mei_device
*dev
, struct file
*file
,
407 char __user
*ubuf
, size_t length
, loff_t
*offset
);
409 unsigned int mei_amthif_poll(struct mei_device
*dev
,
410 struct file
*file
, poll_table
*wait
);
412 int mei_amthif_release(struct mei_device
*dev
, struct file
*file
);
414 struct mei_cl_cb
*mei_amthif_find_read_list_entry(struct mei_device
*dev
,
417 void mei_amthif_run_next_cmd(struct mei_device
*dev
);
420 int mei_amthif_irq_write_complete(struct mei_device
*dev
, s32
*slots
,
421 struct mei_cl_cb
*cb
, struct mei_cl_cb
*cmpl_list
);
423 void mei_amthif_complete(struct mei_device
*dev
, struct mei_cl_cb
*cb
);
424 int mei_amthif_irq_read_message(struct mei_cl_cb
*complete_list
,
425 struct mei_device
*dev
, struct mei_msg_hdr
*mei_hdr
);
426 int mei_amthif_irq_read(struct mei_device
*dev
, s32
*slots
);
429 int mei_wd_send(struct mei_device
*dev
);
430 int mei_wd_stop(struct mei_device
*dev
);
431 int mei_wd_host_init(struct mei_device
*dev
);
433 * mei_watchdog_register - Registering watchdog interface
434 * once we got connection to the WD Client
437 void mei_watchdog_register(struct mei_device
*dev
);
439 * mei_watchdog_unregister - Unregistering watchdog interface
442 void mei_watchdog_unregister(struct mei_device
*dev
);
445 * Register Access Function
448 static inline void mei_hw_config(struct mei_device
*dev
)
450 dev
->ops
->hw_config(dev
);
452 static inline void mei_hw_reset(struct mei_device
*dev
, bool enable
)
454 dev
->ops
->hw_reset(dev
, enable
);
457 static inline void mei_clear_interrupts(struct mei_device
*dev
)
459 dev
->ops
->intr_clear(dev
);
462 static inline void mei_enable_interrupts(struct mei_device
*dev
)
464 dev
->ops
->intr_enable(dev
);
467 static inline void mei_disable_interrupts(struct mei_device
*dev
)
469 dev
->ops
->intr_disable(dev
);
472 static inline void mei_host_set_ready(struct mei_device
*dev
)
474 dev
->ops
->host_set_ready(dev
);
476 static inline bool mei_host_is_ready(struct mei_device
*dev
)
478 return dev
->ops
->host_is_ready(dev
);
480 static inline bool mei_hw_is_ready(struct mei_device
*dev
)
482 return dev
->ops
->hw_is_ready(dev
);
485 static inline bool mei_hbuf_is_ready(struct mei_device
*dev
)
487 return dev
->ops
->hbuf_is_ready(dev
);
490 static inline int mei_hbuf_empty_slots(struct mei_device
*dev
)
492 return dev
->ops
->hbuf_free_slots(dev
);
495 static inline size_t mei_hbuf_max_len(const struct mei_device
*dev
)
497 return dev
->ops
->hbuf_max_len(dev
);
500 static inline int mei_write_message(struct mei_device
*dev
,
501 struct mei_msg_hdr
*hdr
,
504 return dev
->ops
->write(dev
, hdr
, buf
);
507 static inline u32
mei_read_hdr(const struct mei_device
*dev
)
509 return dev
->ops
->read_hdr(dev
);
512 static inline void mei_read_slots(struct mei_device
*dev
,
513 unsigned char *buf
, unsigned long len
)
515 dev
->ops
->read(dev
, buf
, len
);
518 static inline int mei_count_full_read_slots(struct mei_device
*dev
)
520 return dev
->ops
->rdbuf_full_slots(dev
);
523 int mei_register(struct device
*dev
);
524 void mei_deregister(void);
526 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"
527 #define MEI_HDR_PRM(hdr) \
528 (hdr)->host_addr, (hdr)->me_addr, \
529 (hdr)->length, (hdr)->msg_complete