summaryrefslogtreecommitdiffstats
path: root/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c
blob: 4627847c6daab25f57c869aab409dd12b85370d8 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2020-21 Intel Corporation.
 */

#include "iosm_ipc_protocol.h"
#include "iosm_ipc_protocol_ops.h"

/* Get the next free message element.*/
static union ipc_mem_msg_entry *
ipc_protocol_free_msg_get(struct iosm_protocol *ipc_protocol, int *index)
{
	u32 head = le32_to_cpu(ipc_protocol->p_ap_shm->msg_head);
	u32 new_head = (head + 1) % IPC_MEM_MSG_ENTRIES;
	union ipc_mem_msg_entry *msg;

	if (new_head == le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail)) {
		dev_err(ipc_protocol->dev, "message ring is full");
		return NULL;
	}

	/* Get the pointer to the next free message element,
	 * reset the fields and mark is as invalid.
	 */
	msg = &ipc_protocol->p_ap_shm->msg_ring[head];
	memset(msg, 0, sizeof(*msg));

	/* return index in message ring */
	*index = head;

	return msg;
}

/* Updates the message ring Head pointer */
void ipc_protocol_msg_hp_update(struct iosm_imem *ipc_imem)
{
	struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol;
	u32 head = le32_to_cpu(ipc_protocol->p_ap_shm->msg_head);
	u32 new_head = (head + 1) % IPC_MEM_MSG_ENTRIES;

	/* Update head pointer and fire doorbell. */
	ipc_protocol->p_ap_shm->msg_head = cpu_to_le32(new_head);
	ipc_protocol->old_msg_tail =
		le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail);

	ipc_pm_signal_hpda_doorbell(&ipc_protocol->pm, IPC_HP_MR, false);
}

/* Allocate and prepare a OPEN_PIPE message.
 * This also allocates the memory for the new TDR structure and
 * updates the pipe structure referenced in the preparation arguments.
 */
static int ipc_protocol_msg_prepipe_open(struct iosm_protocol *ipc_protocol,
					 union ipc_msg_prep_args *args)
{
	int index;
	union ipc_mem_msg_entry *msg =
		ipc_protocol_free_msg_get(ipc_protocol, &index);
	struct ipc_pipe *pipe = args->pipe_open.pipe;
	struct ipc_protocol_td *tdr;
	struct sk_buff **skbr;

	if (!msg) {
		dev_err(ipc_protocol->dev, "failed to get free message");
		return -EIO;
	}

	/* Allocate the skbuf elements for the skbuf which are on the way.
	 * SKB ring is internal memory allocation for driver. No need to
	 * re-calculate the start and end addresses.
	 */
	skbr = kcalloc(pipe->nr_of_entries, sizeof(*skbr), GFP_ATOMIC);
	if (!skbr)
		return -ENOMEM;

	/* Allocate the transfer descriptors for the pipe. */
	tdr = dma_alloc_coherent(&ipc_protocol->pcie->pci->dev,
				 pipe->nr_of_entries * sizeof(*tdr),
				 &pipe->phy_tdr_start, GFP_ATOMIC);
	if (!tdr) {
		kfree(skbr);
		dev_err(ipc_protocol->dev, "tdr alloc error");
		return -ENOMEM;
	}

	pipe->max_nr_of_queued_entries = pipe->nr_of_entries - 1;
	pipe->nr_of_queued_entries = 0;
	pipe->tdr_start = tdr;
	pipe->skbr_start = skbr;
	pipe->old_tail = 0;

	ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr] = 0;

	msg->open_pipe.type_of_message = IPC_MEM_MSG_OPEN_PIPE;
	msg->open_pipe.pipe_nr = pipe->pipe_nr;
	msg->open_pipe.tdr_addr = cpu_to_le64(pipe->phy_tdr_start);
	msg->open_pipe.tdr_entries = cpu_to_le16(pipe->nr_of_entries);
	msg->open_pipe.accumulation_backoff =
				cpu_to_le32(pipe->accumulation_backoff);
	msg->open_pipe.irq_vector = cpu_to_le32(pipe->irq);

	return index;
}

static int ipc_protocol_msg_prepipe_close(struct iosm_protocol *ipc_protocol,
					  union ipc_msg_prep_args *args)
{
	int index = -1;
	union ipc_mem_msg_entry *msg =
		ipc_protocol_free_msg_get(ipc_protocol, &index);
	struct ipc_pipe *pipe = args->pipe_close.pipe;

	if (!msg)
		return -EIO;

	msg->close_pipe.type_of_message = IPC_MEM_MSG_CLOSE_PIPE;
	msg->close_pipe.pipe_nr = pipe->pipe_nr;

	dev_dbg(ipc_protocol->dev, "IPC_MEM_MSG_CLOSE_PIPE(pipe_nr=%d)",
		msg->close_pipe.pipe_nr);

	return index;
}

static int ipc_protocol_msg_prep_sleep(struct iosm_protocol *ipc_protocol,
				       union ipc_msg_prep_args *args)
{
	int index = -1;
	union ipc_mem_msg_entry *msg =
		ipc_protocol_free_msg_get(ipc_protocol, &index);

	if (!msg) {
		dev_err(ipc_protocol->dev, "failed to get free message");
		return -EIO;
	}

	/* Prepare and send the host sleep message to CP to enter or exit D3. */
	msg->host_sleep.type_of_message = IPC_MEM_MSG_SLEEP;
	msg->host_sleep.target = args->sleep.target; /* 0=host, 1=device */

	/* state; 0=enter, 1=exit 2=enter w/o protocol */
	msg->host_sleep.state = args->sleep.state;

	dev_dbg(ipc_protocol->dev, "IPC_MEM_MSG_SLEEP(target=%d; state=%d)",
		msg->host_sleep.target, msg->host_sleep.state);

	return index;
}

static int ipc_protocol_msg_prep_feature_set(struct iosm_protocol *ipc_protocol,
					     union ipc_msg_prep_args *args)
{
	int index = -1;
	union ipc_mem_msg_entry *msg =
		ipc_protocol_free_msg_get(ipc_protocol, &index);

	if (!msg) {
		dev_err(ipc_protocol->dev, "failed to get free message");
		return -EIO;
	}

	msg->feature_set.type_of_message = IPC_MEM_MSG_FEATURE_SET;
	msg->feature_set.reset_enable = args->feature_set.reset_enable <<
					RESET_BIT;

	dev_dbg(ipc_protocol->dev, "IPC_MEM_MSG_FEATURE_SET(reset_enable=%d)",
		msg->feature_set.reset_enable >> RESET_BIT);

	return index;
}

/* Processes the message consumed by CP. */
bool ipc_protocol_msg_process(struct iosm_imem *ipc_imem, int irq)
{
	struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol;
	struct ipc_rsp **rsp_ring = ipc_protocol->rsp_ring;
	bool msg_processed = false;
	u32 i;

	if (le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail) >=
			IPC_MEM_MSG_ENTRIES) {
		dev_err(ipc_protocol->dev, "msg_tail out of range: %d",
			le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail));
		return msg_processed;
	}

	if (irq != IMEM_IRQ_DONT_CARE &&
	    irq != ipc_protocol->p_ap_shm->ci.msg_irq_vector)
		return msg_processed;

	for (i = ipc_protocol->old_msg_tail;
	     i != le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail);
	     i = (i + 1) % IPC_MEM_MSG_ENTRIES) {
		union ipc_mem_msg_entry *msg =
			&ipc_protocol->p_ap_shm->msg_ring[i];

		dev_dbg(ipc_protocol->dev, "msg[%d]: type=%u status=%d", i,
			msg->common.type_of_message,
			msg->common.completion_status);

		/* Update response with status and wake up waiting requestor */
		if (rsp_ring[i]) {
			rsp_ring[i]->status =
				le32_to_cpu(msg->common.completion_status);
			complete(&rsp_ring[i]->completion);
			rsp_ring[i] = NULL;
		}
		msg_processed = true;
	}

	ipc_protocol->old_msg_tail = i;
	return msg_processed;
}

/* Sends data from UL list to CP for the provided pipe by updating the Head
 * pointer of given pipe.
 */
bool ipc_protocol_ul_td_send(struct iosm_protocol *ipc_protocol,
			     struct ipc_pipe *pipe,
			     struct sk_buff_head *p_ul_list)
{
	struct ipc_protocol_td *td;
	bool hpda_pending = false;
	struct sk_buff *skb;
	s32 free_elements;
	u32 head;
	u32 tail;

	if (!ipc_protocol->p_ap_shm) {
		dev_err(ipc_protocol->dev, "driver is not initialized");
		return false;
	}

	/* Get head and tail of the td list and calculate
	 * the number of free elements.
	 */
	head = le32_to_cpu(ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr]);
	tail = pipe->old_tail;

	while (!skb_queue_empty(p_ul_list)) {
		if (head < tail)
			free_elements = tail - head - 1;
		else
			free_elements =
				pipe->nr_of_entries - head + ((s32)tail - 1);

		if (free_elements <= 0) {
			dev_dbg(ipc_protocol->dev,
				"no free td elements for UL pipe %d",
				pipe->pipe_nr);
			break;
		}

		/* Get the td address. */
		td = &pipe->tdr_start[head];

		/* Take the first element of the uplink list and add it
		 * to the td list.
		 */
		skb = skb_dequeue(p_ul_list);
		if (WARN_ON(!skb))
			break;

		/* Save the reference to the uplink skbuf. */
		pipe->skbr_start[head] = skb;

		td->buffer.address = IPC_CB(skb)->mapping;
		td->scs = cpu_to_le32(skb->len) & cpu_to_le32(SIZE_MASK);
		td->next = 0;

		pipe->nr_of_queued_entries++;

		/* Calculate the new head and save it. */
		head++;
		if (head >= pipe->nr_of_entries)
			head = 0;

		ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr] =
			cpu_to_le32(head);
	}

	if (pipe->old_head != head) {
		dev_dbg(ipc_protocol->dev, "New UL TDs Pipe:%d", pipe->pipe_nr);

		pipe->old_head = head;
		/* Trigger doorbell because of pending UL packets. */
		hpda_pending = true;
	}

	return hpda_pending;
}

/* Checks for Tail pointer update from CP and returns the data as SKB. */
struct sk_buff *ipc_protocol_ul_td_process(struct iosm_protocol *ipc_protocol,
					   struct ipc_pipe *pipe)
{
	struct ipc_protocol_td *p_td = &pipe->tdr_start[pipe->old_tail];
	struct sk_buff *skb = pipe->skbr_start[pipe->old_tail];

	pipe->nr_of_queued_entries--;
	pipe->old_tail++;
	if (pipe->old_tail >= pipe->nr_of_entries)
		pipe->old_tail = 0;

	if (!p_td->buffer.address) {
		dev_err(ipc_protocol->dev, "Td buffer address is NULL");
		return NULL;
	}

	if (p_td->buffer.address != IPC_CB(skb)->mapping) {
		dev_err(ipc_protocol->dev,
			"pipe %d: invalid buf_addr or skb_data",
			pipe->pipe_nr);
		return NULL;
	}

	return skb;
}

/* Allocates an SKB for CP to send data and updates the Head Pointer
 * of the given Pipe#.
 */
bool ipc_protocol_dl_td_prepare(struct iosm_protocol *ipc_protocol,
				struct ipc_pipe *pipe)
{
	struct ipc_protocol_td *td;
	dma_addr_t mapping = 0;
	u32 head, new_head;
	struct sk_buff *skb;
	u32 tail;

	/* Get head and tail of the td list and calculate
	 * the number of free elements.
	 */
	head = le32_to_cpu(ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr]);
	tail = le32_to_cpu(ipc_protocol->p_ap_shm->tail_array[pipe->pipe_nr]);

	new_head = head + 1;
	if (new_head >= pipe->nr_of_entries)
		new_head = 0;

	if (new_head == tail)
		return false;

	/* Get the td address. */
	td = &pipe->tdr_start[head];

	/* Allocate the skbuf for the descriptor. */
	skb = ipc_pcie_alloc_skb(ipc_protocol->pcie, pipe->buf_size, GFP_ATOMIC,
				 &mapping, DMA_FROM_DEVICE,
				 IPC_MEM_DL_ETH_OFFSET);
	if (!skb)
		return false;

	td->buffer.address = mapping;
	td->scs = cpu_to_le32(pipe->buf_size) & cpu_to_le32(SIZE_MASK);
	td->next = 0;

	/* store the new head value. */
	ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr] =
		cpu_to_le32(new_head);

	/* Save the reference to the skbuf. */
	pipe->skbr_start[head] = skb;

	pipe->nr_of_queued_entries++;

	return true;
}

/* Processes DL TD's */
struct sk_buff *ipc_protocol_dl_td_process(struct iosm_protocol *ipc_protocol,
					   struct ipc_pipe *pipe)
{
	struct ipc_protocol_td *p_td;
	struct sk_buff *skb;

	if (!pipe->tdr_start)
		return NULL;

	/* Copy the reference to the downlink buffer. */
	p_td = &pipe->tdr_start[pipe->old_tail];
	skb = pipe->skbr_start[pipe->old_tail];

	/* Reset the ring elements. */
	pipe->skbr_start[pipe->old_tail] = NULL;

	pipe->nr_of_queued_entries--;

	pipe->old_tail++;
	if (pipe->old_tail >= pipe->nr_of_entries)
		pipe->old_tail = 0;

	if (!skb) {
		dev_err(ipc_protocol->dev, "skb is null");
		goto ret;
	} else if (!p_td->buffer.address) {
		dev_err(ipc_protocol->dev, "td/buffer address is null");
		ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
		skb = NULL;
		goto ret;
	}

	if (p_td->buffer.address != IPC_CB(skb)->mapping) {
		dev_err(ipc_protocol->dev, "invalid buf=%llx or skb=%p",
			(unsigned long long)p_td->buffer.address, skb->data);
		ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
		skb = NULL;
		goto ret;
	} else if ((le32_to_cpu(p_td->scs) & SIZE_MASK) > pipe->buf_size) {
		dev_err(ipc_protocol->dev, "invalid buffer size %d > %d",
			le32_to_cpu(p_td->scs) & SIZE_MASK,
			pipe->buf_size);
		ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
		skb = NULL;
		goto ret;
	} else if (le32_to_cpu(p_td->scs) >> COMPLETION_STATUS ==
		  IPC_MEM_TD_CS_ABORT) {
		/* Discard aborted buffers. */
		dev_dbg(ipc_protocol->dev, "discard 'aborted' buffers");
		ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
		skb = NULL;
		goto ret;
	}

	/* Set the length field in skbuf. */
	skb_put(skb, le32_to_cpu(p_td->scs) & SIZE_MASK);

ret:
	return skb;
}

void ipc_protocol_get_head_tail_index(struct iosm_protocol *ipc_protocol,
				      struct ipc_pipe *pipe, u32 *head,
				      u32 *tail)
{
	struct ipc_protocol_ap_shm *ipc_ap_shm = ipc_protocol->p_ap_shm;

	if (head)
		*head = le32_to_cpu(ipc_ap_shm->head_array[pipe->pipe_nr]);

	if (tail)
		*tail = le32_to_cpu(ipc_ap_shm->tail_array[pipe->pipe_nr]);
}

/* Frees the TDs given to CP.  */
void ipc_protocol_pipe_cleanup(struct iosm_protocol *ipc_protocol,
			       struct ipc_pipe *pipe)
{
	struct sk_buff *skb;
	u32 head;
	u32 tail;

	/* Get the start and the end of the buffer list. */
	head = le32_to_cpu(ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr]);
	tail = pipe->old_tail;

	/* Reset tail and head to 0. */
	ipc_protocol->p_ap_shm->tail_array[pipe->pipe_nr] = 0;
	ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr] = 0;

	/* Free pending uplink and downlink buffers. */
	if (pipe->skbr_start) {
		while (head != tail) {
			/* Get the reference to the skbuf,
			 * which is on the way and free it.
			 */
			skb = pipe->skbr_start[tail];
			if (skb)
				ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);

			tail++;
			if (tail >= pipe->nr_of_entries)
				tail = 0;
		}

		kfree(pipe->skbr_start);
		pipe->skbr_start = NULL;
	}

	pipe->old_tail = 0;

	/* Free and reset the td and skbuf circular buffers. kfree is save! */
	if (pipe->tdr_start) {
		dma_free_coherent(&ipc_protocol->pcie->pci->dev,
				  sizeof(*pipe->tdr_start) * pipe->nr_of_entries,
				  pipe->tdr_start, pipe->phy_tdr_start);

		pipe->tdr_start = NULL;
	}
}

enum ipc_mem_device_ipc_state ipc_protocol_get_ipc_status(struct iosm_protocol
							  *ipc_protocol)
{
	return (enum ipc_mem_device_ipc_state)
		le32_to_cpu(ipc_protocol->p_ap_shm->device_info.ipc_status);
}

enum ipc_mem_exec_stage
ipc_protocol_get_ap_exec_stage(struct iosm_protocol *ipc_protocol)
{
	return le32_to_cpu(ipc_protocol->p_ap_shm->device_info.execution_stage);
}

int ipc_protocol_msg_prep(struct iosm_imem *ipc_imem,
			  enum ipc_msg_prep_type msg_type,
			  union ipc_msg_prep_args *args)
{
	struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol;

	switch (msg_type) {
	case IPC_MSG_PREP_SLEEP:
		return ipc_protocol_msg_prep_sleep(ipc_protocol, args);

	case IPC_MSG_PREP_PIPE_OPEN:
		return ipc_protocol_msg_prepipe_open(ipc_protocol, args);

	case IPC_MSG_PREP_PIPE_CLOSE:
		return ipc_protocol_msg_prepipe_close(ipc_protocol, args);

	case IPC_MSG_PREP_FEATURE_SET:
		return ipc_protocol_msg_prep_feature_set(ipc_protocol, args);

		/* Unsupported messages in protocol */
	case IPC_MSG_PREP_MAP:
	case IPC_MSG_PREP_UNMAP:
	default:
		dev_err(ipc_protocol->dev,
			"unsupported message type: %d in protocol", msg_type);
		return -EINVAL;
	}
}

u32
ipc_protocol_pm_dev_get_sleep_notification(struct iosm_protocol *ipc_protocol)
{
	struct ipc_protocol_ap_shm *ipc_ap_shm = ipc_protocol->p_ap_shm;

	return le32_to_cpu(ipc_ap_shm->device_info.device_sleep_notification);
}