summaryrefslogtreecommitdiffstats
path: root/kernel/arch/tile/gxio/mpipe.c
blob: ee186e13dfe6fde92c9127aa07dccc474d1253d2 (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
/*
 * Copyright 2012 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 */

/*
 * Implementation of mpipe gxio calls.
 */

#include <linux/errno.h>
#include <linux/io.h>
#include <linux/module.h>

#include <gxio/iorpc_globals.h>
#include <gxio/iorpc_mpipe.h>
#include <gxio/iorpc_mpipe_info.h>
#include <gxio/kiorpc.h>
#include <gxio/mpipe.h>

/* HACK: Avoid pointless "shadow" warnings. */
#define link link_shadow

/**
 * strscpy - Copy a C-string into a sized buffer, but only if it fits
 * @dest: Where to copy the string to
 * @src: Where to copy the string from
 * @size: size of destination buffer
 *
 * Use this routine to avoid copying too-long strings.
 * The routine returns the total number of bytes copied
 * (including the trailing NUL) or zero if the buffer wasn't
 * big enough.  To ensure that programmers pay attention
 * to the return code, the destination has a single NUL
 * written at the front (if size is non-zero) when the
 * buffer is not big enough.
 */
static size_t strscpy(char *dest, const char *src, size_t size)
{
	size_t len = strnlen(src, size) + 1;
	if (len > size) {
		if (size)
			dest[0] = '\0';
		return 0;
	}
	memcpy(dest, src, len);
	return len;
}

int gxio_mpipe_init(gxio_mpipe_context_t *context, unsigned int mpipe_index)
{
	char file[32];

	int fd;
	int i;

	if (mpipe_index >= GXIO_MPIPE_INSTANCE_MAX)
		return -EINVAL;

	snprintf(file, sizeof(file), "mpipe/%d/iorpc", mpipe_index);
	fd = hv_dev_open((HV_VirtAddr) file, 0);

	context->fd = fd;

	if (fd < 0) {
		if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
			return fd;
		else
			return -ENODEV;
	}

	/* Map in the MMIO space. */
	context->mmio_cfg_base = (void __force *)
		iorpc_ioremap(fd, HV_MPIPE_CONFIG_MMIO_OFFSET,
			      HV_MPIPE_CONFIG_MMIO_SIZE);
	if (context->mmio_cfg_base == NULL)
		goto cfg_failed;

	context->mmio_fast_base = (void __force *)
		iorpc_ioremap(fd, HV_MPIPE_FAST_MMIO_OFFSET,
			      HV_MPIPE_FAST_MMIO_SIZE);
	if (context->mmio_fast_base == NULL)
		goto fast_failed;

	/* Initialize the stacks. */
	for (i = 0; i < 8; i++)
		context->__stacks.stacks[i] = 255;

	context->instance = mpipe_index;

	return 0;

      fast_failed:
	iounmap((void __force __iomem *)(context->mmio_cfg_base));
      cfg_failed:
	hv_dev_close(context->fd);
	context->fd = -1;
	return -ENODEV;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_init);

int gxio_mpipe_destroy(gxio_mpipe_context_t *context)
{
	iounmap((void __force __iomem *)(context->mmio_cfg_base));
	iounmap((void __force __iomem *)(context->mmio_fast_base));
	return hv_dev_close(context->fd);
}

EXPORT_SYMBOL_GPL(gxio_mpipe_destroy);

static int16_t gxio_mpipe_buffer_sizes[8] =
	{ 128, 256, 512, 1024, 1664, 4096, 10368, 16384 };

gxio_mpipe_buffer_size_enum_t gxio_mpipe_buffer_size_to_buffer_size_enum(size_t
									 size)
{
	int i;
	for (i = 0; i < 7; i++)
		if (size <= gxio_mpipe_buffer_sizes[i])
			break;
	return i;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_buffer_size_to_buffer_size_enum);

size_t gxio_mpipe_buffer_size_enum_to_buffer_size(gxio_mpipe_buffer_size_enum_t
						  buffer_size_enum)
{
	if (buffer_size_enum > 7)
		buffer_size_enum = 7;

	return gxio_mpipe_buffer_sizes[buffer_size_enum];
}

EXPORT_SYMBOL_GPL(gxio_mpipe_buffer_size_enum_to_buffer_size);

size_t gxio_mpipe_calc_buffer_stack_bytes(unsigned long buffers)
{
	const int BUFFERS_PER_LINE = 12;

	/* Count the number of cachlines. */
	unsigned long lines =
		(buffers + BUFFERS_PER_LINE - 1) / BUFFERS_PER_LINE;

	/* Convert to bytes. */
	return lines * CHIP_L2_LINE_SIZE();
}

EXPORT_SYMBOL_GPL(gxio_mpipe_calc_buffer_stack_bytes);

int gxio_mpipe_init_buffer_stack(gxio_mpipe_context_t *context,
				 unsigned int stack,
				 gxio_mpipe_buffer_size_enum_t
				 buffer_size_enum, void *mem, size_t mem_size,
				 unsigned int mem_flags)
{
	int result;

	memset(mem, 0, mem_size);

	result = gxio_mpipe_init_buffer_stack_aux(context, mem, mem_size,
						  mem_flags, stack,
						  buffer_size_enum);
	if (result < 0)
		return result;

	/* Save the stack. */
	context->__stacks.stacks[buffer_size_enum] = stack;

	return 0;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_init_buffer_stack);

int gxio_mpipe_init_notif_ring(gxio_mpipe_context_t *context,
			       unsigned int ring,
			       void *mem, size_t mem_size,
			       unsigned int mem_flags)
{
	return gxio_mpipe_init_notif_ring_aux(context, mem, mem_size,
					      mem_flags, ring);
}

EXPORT_SYMBOL_GPL(gxio_mpipe_init_notif_ring);

int gxio_mpipe_init_notif_group_and_buckets(gxio_mpipe_context_t *context,
					    unsigned int group,
					    unsigned int ring,
					    unsigned int num_rings,
					    unsigned int bucket,
					    unsigned int num_buckets,
					    gxio_mpipe_bucket_mode_t mode)
{
	int i;
	int result;

	gxio_mpipe_bucket_info_t bucket_info = { {
						  .group = group,
						  .mode = mode,
						  }
	};

	gxio_mpipe_notif_group_bits_t bits = { {0} };

	for (i = 0; i < num_rings; i++)
		gxio_mpipe_notif_group_add_ring(&bits, ring + i);

	result = gxio_mpipe_init_notif_group(context, group, bits);
	if (result != 0)
		return result;

	for (i = 0; i < num_buckets; i++) {
		bucket_info.notifring = ring + (i % num_rings);

		result = gxio_mpipe_init_bucket(context, bucket + i,
						bucket_info);
		if (result != 0)
			return result;
	}

	return 0;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_init_notif_group_and_buckets);

int gxio_mpipe_init_edma_ring(gxio_mpipe_context_t *context,
			      unsigned int ring, unsigned int channel,
			      void *mem, size_t mem_size,
			      unsigned int mem_flags)
{
	memset(mem, 0, mem_size);

	return gxio_mpipe_init_edma_ring_aux(context, mem, mem_size, mem_flags,
					     ring, channel);
}

EXPORT_SYMBOL_GPL(gxio_mpipe_init_edma_ring);

void gxio_mpipe_rules_init(gxio_mpipe_rules_t *rules,
			   gxio_mpipe_context_t *context)
{
	rules->context = context;
	memset(&rules->list, 0, sizeof(rules->list));
}

EXPORT_SYMBOL_GPL(gxio_mpipe_rules_init);

int gxio_mpipe_rules_begin(gxio_mpipe_rules_t *rules,
			   unsigned int bucket, unsigned int num_buckets,
			   gxio_mpipe_rules_stacks_t *stacks)
{
	int i;
	int stack = 255;

	gxio_mpipe_rules_list_t *list = &rules->list;

	/* Current rule. */
	gxio_mpipe_rules_rule_t *rule =
		(gxio_mpipe_rules_rule_t *) (list->rules + list->head);

	unsigned int head = list->tail;

	/*
	 * Align next rule properly.
	 *Note that "dmacs_and_vlans" will also be aligned.
	 */
	unsigned int pad = 0;
	while (((head + pad) % __alignof__(gxio_mpipe_rules_rule_t)) != 0)
		pad++;

	/*
	 * Verify room.
	 * ISSUE: Mark rules as broken on error?
	 */
	if (head + pad + sizeof(*rule) >= sizeof(list->rules))
		return GXIO_MPIPE_ERR_RULES_FULL;

	/* Verify num_buckets is a power of 2. */
	if (__builtin_popcount(num_buckets) != 1)
		return GXIO_MPIPE_ERR_RULES_INVALID;

	/* Add padding to previous rule. */
	rule->size += pad;

	/* Start a new rule. */
	list->head = head + pad;

	rule = (gxio_mpipe_rules_rule_t *) (list->rules + list->head);

	/* Default some values. */
	rule->headroom = 2;
	rule->tailroom = 0;
	rule->capacity = 16384;

	/* Save the bucket info. */
	rule->bucket_mask = num_buckets - 1;
	rule->bucket_first = bucket;

	for (i = 8 - 1; i >= 0; i--) {
		int maybe =
			stacks ? stacks->stacks[i] : rules->context->__stacks.
			stacks[i];
		if (maybe != 255)
			stack = maybe;
		rule->stacks.stacks[i] = stack;
	}

	if (stack == 255)
		return GXIO_MPIPE_ERR_RULES_INVALID;

	/* NOTE: Only entries at the end of the array can be 255. */
	for (i = 8 - 1; i > 0; i--) {
		if (rule->stacks.stacks[i] == 255) {
			rule->stacks.stacks[i] = stack;
			rule->capacity =
				gxio_mpipe_buffer_size_enum_to_buffer_size(i -
									   1);
		}
	}

	rule->size = sizeof(*rule);
	list->tail = list->head + rule->size;

	return 0;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_rules_begin);

int gxio_mpipe_rules_add_channel(gxio_mpipe_rules_t *rules,
				 unsigned int channel)
{
	gxio_mpipe_rules_list_t *list = &rules->list;

	gxio_mpipe_rules_rule_t *rule =
		(gxio_mpipe_rules_rule_t *) (list->rules + list->head);

	/* Verify channel. */
	if (channel >= 32)
		return GXIO_MPIPE_ERR_RULES_INVALID;

	/* Verify begun. */
	if (list->tail == 0)
		return GXIO_MPIPE_ERR_RULES_EMPTY;

	rule->channel_bits |= (1UL << channel);

	return 0;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_rules_add_channel);

int gxio_mpipe_rules_set_headroom(gxio_mpipe_rules_t *rules, uint8_t headroom)
{
	gxio_mpipe_rules_list_t *list = &rules->list;

	gxio_mpipe_rules_rule_t *rule =
		(gxio_mpipe_rules_rule_t *) (list->rules + list->head);

	/* Verify begun. */
	if (list->tail == 0)
		return GXIO_MPIPE_ERR_RULES_EMPTY;

	rule->headroom = headroom;

	return 0;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_rules_set_headroom);

int gxio_mpipe_rules_commit(gxio_mpipe_rules_t *rules)
{
	gxio_mpipe_rules_list_t *list = &rules->list;
	unsigned int size =
		offsetof(gxio_mpipe_rules_list_t, rules) + list->tail;
	return gxio_mpipe_commit_rules(rules->context, list, size);
}

EXPORT_SYMBOL_GPL(gxio_mpipe_rules_commit);

int gxio_mpipe_iqueue_init(gxio_mpipe_iqueue_t *iqueue,
			   gxio_mpipe_context_t *context,
			   unsigned int ring,
			   void *mem, size_t mem_size, unsigned int mem_flags)
{
	/* The init call below will verify that "mem_size" is legal. */
	unsigned int num_entries = mem_size / sizeof(gxio_mpipe_idesc_t);

	iqueue->context = context;
	iqueue->idescs = (gxio_mpipe_idesc_t *)mem;
	iqueue->ring = ring;
	iqueue->num_entries = num_entries;
	iqueue->mask_num_entries = num_entries - 1;
	iqueue->log2_num_entries = __builtin_ctz(num_entries);
	iqueue->head = 1;
#ifdef __BIG_ENDIAN__
	iqueue->swapped = 0;
#endif

	/* Initialize the "tail". */
	__gxio_mmio_write(mem, iqueue->head);

	return gxio_mpipe_init_notif_ring(context, ring, mem, mem_size,
					  mem_flags);
}

EXPORT_SYMBOL_GPL(gxio_mpipe_iqueue_init);

int gxio_mpipe_equeue_init(gxio_mpipe_equeue_t *equeue,
			   gxio_mpipe_context_t *context,
			   unsigned int ering,
			   unsigned int channel,
			   void *mem, unsigned int mem_size,
			   unsigned int mem_flags)
{
	/* The init call below will verify that "mem_size" is legal. */
	unsigned int num_entries = mem_size / sizeof(gxio_mpipe_edesc_t);

	/* Offset used to read number of completed commands. */
	MPIPE_EDMA_POST_REGION_ADDR_t offset;

	int result = gxio_mpipe_init_edma_ring(context, ering, channel,
					       mem, mem_size, mem_flags);
	if (result < 0)
		return result;

	memset(equeue, 0, sizeof(*equeue));

	offset.word = 0;
	offset.region =
		MPIPE_MMIO_ADDR__REGION_VAL_EDMA -
		MPIPE_MMIO_ADDR__REGION_VAL_IDMA;
	offset.ring = ering;

	__gxio_dma_queue_init(&equeue->dma_queue,
			      context->mmio_fast_base + offset.word,
			      num_entries);
	equeue->edescs = mem;
	equeue->mask_num_entries = num_entries - 1;
	equeue->log2_num_entries = __builtin_ctz(num_entries);
	equeue->context = context;
	equeue->ering = ering;
	equeue->channel = channel;

	return 0;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_equeue_init);

int gxio_mpipe_set_timestamp(gxio_mpipe_context_t *context,
			     const struct timespec64 *ts)
{
	cycles_t cycles = get_cycles();
	return gxio_mpipe_set_timestamp_aux(context, (uint64_t)ts->tv_sec,
					    (uint64_t)ts->tv_nsec,
					    (uint64_t)cycles);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_set_timestamp);

int gxio_mpipe_get_timestamp(gxio_mpipe_context_t *context,
			     struct timespec64 *ts)
{
	int ret;
	cycles_t cycles_prev, cycles_now, clock_rate;
	cycles_prev = get_cycles();
	ret = gxio_mpipe_get_timestamp_aux(context, (uint64_t *)&ts->tv_sec,
					   (uint64_t *)&ts->tv_nsec,
					   (uint64_t *)&cycles_now);
	if (ret < 0) {
		return ret;
	}

	clock_rate = get_clock_rate();
	ts->tv_nsec -= (cycles_now - cycles_prev) * 1000000000LL / clock_rate;
	if (ts->tv_nsec < 0) {
		ts->tv_nsec += 1000000000LL;
		ts->tv_sec -= 1;
	}
	return ret;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_get_timestamp);

int gxio_mpipe_adjust_timestamp(gxio_mpipe_context_t *context, int64_t delta)
{
	return gxio_mpipe_adjust_timestamp_aux(context, delta);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_adjust_timestamp);

/* Get our internal context used for link name access.  This context is
 *  special in that it is not associated with an mPIPE service domain.
 */
static gxio_mpipe_context_t *_gxio_get_link_context(void)
{
	static gxio_mpipe_context_t context;
	static gxio_mpipe_context_t *contextp;
	static int tried_open = 0;
	static DEFINE_MUTEX(mutex);

	mutex_lock(&mutex);

	if (!tried_open) {
		int i = 0;
		tried_open = 1;

		/*
		 * "4" here is the maximum possible number of mPIPE shims; it's
		 * an exaggeration but we shouldn't ever go beyond 2 anyway.
		 */
		for (i = 0; i < 4; i++) {
			char file[80];

			snprintf(file, sizeof(file), "mpipe/%d/iorpc_info", i);
			context.fd = hv_dev_open((HV_VirtAddr) file, 0);
			if (context.fd < 0)
				continue;

			contextp = &context;
			break;
		}
	}

	mutex_unlock(&mutex);

	return contextp;
}

int gxio_mpipe_link_instance(const char *link_name)
{
	_gxio_mpipe_link_name_t name;
	gxio_mpipe_context_t *context = _gxio_get_link_context();

	if (!context)
		return GXIO_ERR_NO_DEVICE;

	if (strscpy(name.name, link_name, sizeof(name.name)) == 0)
		return GXIO_ERR_NO_DEVICE;

	return gxio_mpipe_info_instance_aux(context, name);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_link_instance);

int gxio_mpipe_link_enumerate_mac(int idx, char *link_name, uint8_t *link_mac)
{
	int rv;
	_gxio_mpipe_link_name_t name;
	_gxio_mpipe_link_mac_t mac;

	gxio_mpipe_context_t *context = _gxio_get_link_context();
	if (!context)
		return GXIO_ERR_NO_DEVICE;

	rv = gxio_mpipe_info_enumerate_aux(context, idx, &name, &mac);
	if (rv >= 0) {
		if (strscpy(link_name, name.name, sizeof(name.name)) == 0)
			return GXIO_ERR_INVAL_MEMORY_SIZE;
		memcpy(link_mac, mac.mac, sizeof(mac.mac));
	}

	return rv;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_link_enumerate_mac);

int gxio_mpipe_link_open(gxio_mpipe_link_t *link,
			 gxio_mpipe_context_t *context, const char *link_name,
			 unsigned int flags)
{
	_gxio_mpipe_link_name_t name;
	int rv;

	if (strscpy(name.name, link_name, sizeof(name.name)) == 0)
		return GXIO_ERR_NO_DEVICE;

	rv = gxio_mpipe_link_open_aux(context, name, flags);
	if (rv < 0)
		return rv;

	link->context = context;
	link->channel = rv >> 8;
	link->mac = rv & 0xFF;

	return 0;
}

EXPORT_SYMBOL_GPL(gxio_mpipe_link_open);

int gxio_mpipe_link_close(gxio_mpipe_link_t *link)
{
	return gxio_mpipe_link_close_aux(link->context, link->mac);
}

EXPORT_SYMBOL_GPL(gxio_mpipe_link_close);

int gxio_mpipe_link_set_attr(gxio_mpipe_link_t *link, uint32_t attr,
			     int64_t val)
{
	return gxio_mpipe_link_set_attr_aux(link->context, link->mac, attr,
					    val);
}

EXPORT_SYMBOL_GPL(gxio_mpipe_link_set_attr);