summaryrefslogtreecommitdiffstats
path: root/drivers/misc/mei/mei_dev.h
blob: 197ba6481bf5799761183aa3fa4b0ae2c82f4eb6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
/*
 *
 * Intel Management Engine Interface (Intel MEI) Linux driver
 * Copyright (c) 2003-2012, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

#ifndef _MEI_DEV_H_
#define _MEI_DEV_H_

#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/poll.h>
#include <linux/mei.h>
#include <linux/mei_cl_bus.h>

#include "hw.h"
#include "hw-me-regs.h"
#include "hbm.h"

/*
 * watch dog definition
 */
#define MEI_WD_HDR_SIZE       4
#define MEI_WD_STOP_MSG_SIZE  MEI_WD_HDR_SIZE
#define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16)

#define MEI_WD_DEFAULT_TIMEOUT   120  /* seconds */
#define MEI_WD_MIN_TIMEOUT       120  /* seconds */
#define MEI_WD_MAX_TIMEOUT     65535  /* seconds */

#define MEI_WD_STOP_TIMEOUT      10 /* msecs */

#define MEI_WD_STATE_INDEPENDENCE_MSG_SENT       (1 << 0)

#define MEI_RD_MSG_BUF_SIZE           (128 * sizeof(u32))


/*
 * AMTHI Client UUID
 */
extern const uuid_le mei_amthif_guid;

/*
 * Watchdog Client UUID
 */
extern const uuid_le mei_wd_guid;

/*
 * Watchdog independence state message
 */
extern const u8 mei_wd_state_independence_msg[3][4];

/*
 * Number of Maximum MEI Clients
 */
#define MEI_CLIENTS_MAX 256

/*
 * Number of File descriptors/handles
 * that can be opened to the driver.
 *
 * Limit to 255: 256 Total Clients
 * minus internal client for MEI Bus Messags
 */
#define  MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)

/*
 * Internal Clients Number
 */
#define MEI_HOST_CLIENT_ID_ANY        (-1)
#define MEI_HBM_HOST_CLIENT_ID         0 /* not used, just for documentation */
#define MEI_WD_HOST_CLIENT_ID          1
#define MEI_IAMTHIF_HOST_CLIENT_ID     2


/* File state */
enum file_state {
	MEI_FILE_INITIALIZING = 0,
	MEI_FILE_CONNECTING,
	MEI_FILE_CONNECTED,
	MEI_FILE_DISCONNECTING,
	MEI_FILE_DISCONNECTED
};

/* MEI device states */
enum mei_dev_state {
	MEI_DEV_INITIALIZING = 0,
	MEI_DEV_INIT_CLIENTS,
	MEI_DEV_ENABLED,
	MEI_DEV_RESETTING,
	MEI_DEV_DISABLED,
	MEI_DEV_POWER_DOWN,
	MEI_DEV_POWER_UP
};

const char *mei_dev_state_str(int state);

enum iamthif_states {
	MEI_IAMTHIF_IDLE,
	MEI_IAMTHIF_WRITING,
	MEI_IAMTHIF_FLOW_CONTROL,
	MEI_IAMTHIF_READING,
	MEI_IAMTHIF_READ_COMPLETE
};

enum mei_file_transaction_states {
	MEI_IDLE,
	MEI_WRITING,
	MEI_WRITE_COMPLETE,
	MEI_FLOW_CONTROL,
	MEI_READING,
	MEI_READ_COMPLETE
};

enum mei_wd_states {
	MEI_WD_IDLE,
	MEI_WD_RUNNING,
	MEI_WD_STOPPING,
};

/**
 * enum mei_cb_file_ops  - file operation associated with the callback
 * @MEI_FOP_READ   - read
 * @MEI_FOP_WRITE  - write
 * @MEI_FOP_IOCTL  - ioctl
 * @MEI_FOP_OPEN   - open
 * @MEI_FOP_CLOSE  - close
 */
enum mei_cb_file_ops {
	MEI_FOP_READ = 0,
	MEI_FOP_WRITE,
	MEI_FOP_IOCTL,
	MEI_FOP_OPEN,
	MEI_FOP_CLOSE
};

/*
 * Intel MEI message data struct
 */
struct mei_msg_data {
	u32 size;
	unsigned char *data;
};

/**
 * struct mei_me_client - representation of me (fw) client
 *
 * @props  - client properties
 * @client_id - me client id
 * @mei_flow_ctrl_creds - flow control credits
 */
struct mei_me_client {
	struct mei_client_properties props;
	u8 client_id;
	u8 mei_flow_ctrl_creds;
};


struct mei_cl;

/**
 * struct mei_cl_cb - file operation callback structure
 *
 * @cl - file client who is running this operation
 * @fop_type - file operation type
 */
struct mei_cl_cb {
	struct list_head list;
	struct mei_cl *cl;
	enum mei_cb_file_ops fop_type;
	struct mei_msg_data request_buffer;
	struct mei_msg_data response_buffer;
	unsigned long buf_idx;
	unsigned long read_time;
	struct file *file_object;
};

/* MEI client instance carried as file->pirvate_data*/
struct mei_cl {
	struct list_head link;
	struct mei_device *dev;
	enum file_state state;
	wait_queue_head_t tx_wait;
	wait_queue_head_t rx_wait;
	wait_queue_head_t wait;
	int status;
	/* ID of client connected */
	u8 host_client_id;
	u8 me_client_id;
	u8 mei_flow_ctrl_creds;
	u8 timer_count;
	enum mei_file_transaction_states reading_state;
	enum mei_file_transaction_states writing_state;
	int sm_state;
	struct mei_cl_cb *read_cb;

	/* MEI CL bus data */
	struct mei_cl_device *device;
	struct list_head device_link;
	uuid_le device_uuid;
};

/** struct mei_hw_ops
 *
 * @host_is_ready    - query for host readiness

 * @hw_is_ready      - query if hw is ready
 * @hw_reset         - reset hw
 * @hw_start         - start hw after reset
 * @hw_config        - configure hw

 * @intr_clear       - clear pending interrupts
 * @intr_enable      - enable interrupts
 * @intr_disable     - disable interrupts

 * @hbuf_free_slots  - query for write buffer empty slots
 * @hbuf_is_ready    - query if write buffer is empty
 * @hbuf_max_len     - query for write buffer max len

 * @write            - write a message to FW

 * @rdbuf_full_slots - query how many slots are filled

 * @read_hdr         - get first 4 bytes (header)
 * @read             - read a buffer from the FW
 */
struct mei_hw_ops {

	bool (*host_is_ready) (struct mei_device *dev);

	bool (*hw_is_ready) (struct mei_device *dev);
	void (*hw_reset) (struct mei_device *dev, bool enable);
	int  (*hw_start) (struct mei_device *dev);
	void (*hw_config) (struct mei_device *dev);

	void (*intr_clear) (struct mei_device *dev);
	void (*intr_enable) (struct mei_device *dev);
	void (*intr_disable) (struct mei_device *dev);

	int (*hbuf_free_slots) (struct mei_device *dev);
	bool (*hbuf_is_ready) (struct mei_device *dev);
	size_t (*hbuf_max_len) (const struct mei_device *dev);

	int (*write)(struct mei_device *dev,
		     struct mei_msg_hdr *hdr,
		     unsigned char *buf);

	int (*rdbuf_full_slots)(struct mei_device *dev);

	u32 (*read_hdr)(const struct mei_device *dev);
	int (*read) (struct mei_device *dev,
		     unsigned char *buf, unsigned long len);
};

/* MEI bus API*/

/**
 * struct mei_cl_ops - MEI CL device ops
 * This structure allows ME host clients to implement technology
 * specific operations.
 *
 * @enable: Enable an MEI CL device. Some devices require specific
 *	HECI commands to initialize completely.
 * @disable: Disable an MEI CL device.
 * @send: Tx hook for the device. This allows ME host clients to trap
 *	the device driver buffers before actually physically
 *	pushing it to the ME.
 * @recv: Rx hook for the device. This allows ME host clients to trap the
 *	ME buffers before forwarding them to the device driver.
 */
struct mei_cl_ops {
	int (*enable)(struct mei_cl_device *device);
	int (*disable)(struct mei_cl_device *device);
	int (*send)(struct mei_cl_device *device, u8 *buf, size_t length);
	int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length);
};

struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
					uuid_le uuid, char *name,
					struct mei_cl_ops *ops);
void mei_cl_remove_device(struct mei_cl_device *device);

int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
void mei_cl_bus_rx_event(struct mei_cl *cl);
int mei_cl_bus_init(void);
void mei_cl_bus_exit(void);


/**
 * struct mei_cl_device - MEI device handle
 * An mei_cl_device pointer is returned from mei_add_device()
 * and links MEI bus clients to their actual ME host client pointer.
 * Drivers for MEI devices will get an mei_cl_device pointer
 * when being probed and shall use it for doing ME bus I/O.
 *
 * @dev: linux driver model device pointer
 * @uuid: me client uuid
 * @cl: mei client
 * @ops: ME transport ops
 * @event_cb: Drivers register this callback to get asynchronous ME
 *	events (e.g. Rx buffer pending) notifications.
 * @events: Events bitmask sent to the driver.
 * @priv_data: client private data
 */
struct mei_cl_device {
	struct device dev;

	struct mei_cl *cl;

	const struct mei_cl_ops *ops;

	struct work_struct event_work;
	mei_cl_event_cb_t event_cb;
	void *event_context;
	unsigned long events;

	void *priv_data;
};

/**
 * struct mei_device -  MEI private device struct

 * @hbm_state - state of host bus message protocol
 * @mem_addr - mem mapped base register address

 * @hbuf_depth - depth of hardware host/write buffer is slots
 * @hbuf_is_ready - query if the host host/write buffer is ready
 * @wr_msg - the buffer for hbm control messages
 * @wr_ext_msg - the buffer for hbm control responses (set in read cycle)
 */
struct mei_device {
	struct pci_dev *pdev;	/* pointer to pci device struct */
	/*
	 * lists of queues
	 */
	/* array of pointers to aio lists */
	struct mei_cl_cb read_list;		/* driver read queue */
	struct mei_cl_cb write_list;		/* driver write queue */
	struct mei_cl_cb write_waiting_list;	/* write waiting queue */
	struct mei_cl_cb ctrl_wr_list;		/* managed write IOCTL list */
	struct mei_cl_cb ctrl_rd_list;		/* managed read IOCTL list */

	/*
	 * list of files
	 */
	struct list_head file_list;
	long open_handle_count;

	/*
	 * lock for the device
	 */
	struct mutex device_lock; /* device lock */
	struct delayed_work timer_work;	/* MEI timer delayed work (timeouts) */

	bool recvd_hw_ready;
	/*
	 * waiting queue for receive message from FW
	 */
	wait_queue_head_t wait_hw_ready;
	wait_queue_head_t wait_recvd_msg;
	wait_queue_head_t wait_stop_wd;

	/*
	 * mei device  states
	 */
	enum mei_dev_state dev_state;
	enum mei_hbm_state hbm_state;
	u16 init_clients_timer;

	unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE];	/* control messages */
	u32 rd_msg_hdr;

	/* write buffer */
	u8 hbuf_depth;
	bool hbuf_is_ready;

	/* used for control messages */
	struct {
		struct mei_msg_hdr hdr;
		unsigned char data[128];
	} wr_msg;

	struct {
		struct mei_msg_hdr hdr;
		unsigned char data[4];	/* All HBM messages are 4 bytes */
	} wr_ext_msg;		/* for control responses */

	struct hbm_version version;

	struct mei_me_client *me_clients; /* Note: memory has to be allocated */
	DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
	DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
	u8 me_clients_num;
	u8 me_client_presentation_num;
	u8 me_client_index;

	struct mei_cl wd_cl;
	enum mei_wd_states wd_state;
	bool wd_pending;
	u16 wd_timeout;
	unsigned char wd_data[MEI_WD_START_MSG_SIZE];


	/* amthif list for cmd waiting */
	struct mei_cl_cb amthif_cmd_list;
	/* driver managed amthif list for reading completed amthif cmd data */
	struct mei_cl_cb amthif_rd_complete_list;
	struct file *iamthif_file_object;
	struct mei_cl iamthif_cl;
	struct mei_cl_cb *iamthif_current_cb;
	int iamthif_mtu;
	unsigned long iamthif_timer;
	u32 iamthif_stall_timer;
	unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
	u32 iamthif_msg_buf_size;
	u32 iamthif_msg_buf_index;
	enum iamthif_states iamthif_state;
	bool iamthif_flow_control_pending;
	bool iamthif_ioctl;
	bool iamthif_canceled;

	struct work_struct init_work;

	/* List of bus devices */
	struct list_head device_list;

#if IS_ENABLED(CONFIG_DEBUG_FS)
	struct dentry *dbgfs_dir;
#endif /* CONFIG_DEBUG_FS */


	const struct mei_hw_ops *ops;
	char hw[0] __aligned(sizeof(void *));
};

static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
{
	return msecs_to_jiffies(sec * MSEC_PER_SEC);
}

/**
 * mei_data2slots - get slots - number of (dwords) from a message length
 *	+ size of the mei header
 * @length - size of the messages in bytes
 * returns  - number of slots
 */
static inline u32 mei_data2slots(size_t length)
{
	return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
}

/*
 * mei init function prototypes
 */
void mei_device_init(struct mei_device *dev);
void mei_reset(struct mei_device *dev, int interrupts);
int mei_start(struct mei_device *dev);
void mei_stop(struct mei_device *dev);

/*
 *  MEI interrupt functions prototype
 */

void mei_timer(struct work_struct *work);
int mei_irq_read_handler(struct mei_device *dev,
		struct mei_cl_cb *cmpl_list, s32 *slots);

int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);

/*
 * AMTHIF - AMT Host Interface Functions
 */
void mei_amthif_reset_params(struct mei_device *dev);

int mei_amthif_host_init(struct mei_device *dev);

int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);

int mei_amthif_read(struct mei_device *dev, struct file *file,
		char __user *ubuf, size_t length, loff_t *offset);

unsigned int mei_amthif_poll(struct mei_device *dev,
		struct file *file, poll_table *wait);

int mei_amthif_release(struct mei_device *dev, struct file *file);

struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
						struct file *file);

void mei_amthif_run_next_cmd(struct mei_device *dev);

int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
				  s32 *slots, struct mei_cl_cb *cmpl_list);

void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
int mei_amthif_irq_read_msg(struct mei_device *dev,
			    struct mei_msg_hdr *mei_hdr,
			    struct mei_cl_cb *complete_list);
int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);

/*
 * NFC functions
 */
int mei_nfc_host_init(struct mei_device *dev);
void mei_nfc_host_exit(void);

/*
 * NFC Client UUID
 */
extern const uuid_le mei_nfc_guid;

int mei_wd_send(struct mei_device *dev);
int mei_wd_stop(struct mei_device *dev);
int mei_wd_host_init(struct mei_device *dev);
/*
 * mei_watchdog_register  - Registering watchdog interface
 *   once we got connection to the WD Client
 * @dev - mei device
 */
void mei_watchdog_register(struct mei_device *dev);
/*
 * mei_watchdog_unregister  - Unregistering watchdog interface
 * @dev - mei device
 */
void mei_watchdog_unregister(struct mei_device *dev);

/*
 * Register Access Function
 */

static inline void mei_hw_config(struct mei_device *dev)
{
	dev->ops->hw_config(dev);
}
static inline void mei_hw_reset(struct mei_device *dev, bool enable)
{
	dev->ops->hw_reset(dev, enable);
}

static inline void mei_hw_start(struct mei_device *dev)
{
	dev->ops->hw_start(dev);
}

static inline void mei_clear_interrupts(struct mei_device *dev)
{
	dev->ops->intr_clear(dev);
}

static inline void mei_enable_interrupts(struct mei_device *dev)
{
	dev->ops->intr_enable(dev);
}

static inline void mei_disable_interrupts(struct mei_device *dev)
{
	dev->ops->intr_disable(dev);
}

static inline bool mei_host_is_ready(struct mei_device *dev)
{
	return dev->ops->host_is_ready(dev);
}
static inline bool mei_hw_is_ready(struct mei_device *dev)
{
	return dev->ops->hw_is_ready(dev);
}

static inline bool mei_hbuf_is_ready(struct mei_device *dev)
{
	return dev->ops->hbuf_is_ready(dev);
}

static inline int mei_hbuf_empty_slots(struct mei_device *dev)
{
	return dev->ops->hbuf_free_slots(dev);
}

static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
{
	return dev->ops->hbuf_max_len(dev);
}

static inline int mei_write_message(struct mei_device *dev,
			struct mei_msg_hdr *hdr,
			unsigned char *buf)
{
	return dev->ops->write(dev, hdr, buf);
}

static inline u32 mei_read_hdr(const struct mei_device *dev)
{
	return dev->ops->read_hdr(dev);
}

static inline void mei_read_slots(struct mei_device *dev,
		     unsigned char *buf, unsigned long len)
{
	dev->ops->read(dev, buf, len);
}

static inline int mei_count_full_read_slots(struct mei_device *dev)
{
	return dev->ops->rdbuf_full_slots(dev);
}

#if IS_ENABLED(CONFIG_DEBUG_FS)
int mei_dbgfs_register(struct mei_device *dev, const char *name);
void mei_dbgfs_deregister(struct mei_device *dev);
#else
static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
{
	return 0;
}
static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
#endif /* CONFIG_DEBUG_FS */

int mei_register(struct mei_device *dev);
void mei_deregister(struct mei_device *dev);

#define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"
#define MEI_HDR_PRM(hdr)                  \
	(hdr)->host_addr, (hdr)->me_addr, \
	(hdr)->length, (hdr)->msg_complete

#endif