summaryrefslogtreecommitdiff
path: root/drivers/net/ipa/ipa_mem.c
blob: db6ada2343afc5c4d4040e582d5cffd728cfcf59 (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
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
 * Copyright (C) 2019-2023 Linaro Ltd.
 */

#include <linux/types.h>
#include <linux/bitfield.h>
#include <linux/bug.h>
#include <linux/dma-mapping.h>
#include <linux/iommu.h>
#include <linux/io.h>
#include <linux/soc/qcom/smem.h>

#include "ipa.h"
#include "ipa_reg.h"
#include "ipa_data.h"
#include "ipa_cmd.h"
#include "ipa_mem.h"
#include "ipa_table.h"
#include "gsi_trans.h"

/* "Canary" value placed between memory regions to detect overflow */
#define IPA_MEM_CANARY_VAL		cpu_to_le32(0xdeadbeef)

/* SMEM host id representing the modem. */
#define QCOM_SMEM_HOST_MODEM	1

const struct ipa_mem *ipa_mem_find(struct ipa *ipa, enum ipa_mem_id mem_id)
{
	u32 i;

	for (i = 0; i < ipa->mem_count; i++) {
		const struct ipa_mem *mem = &ipa->mem[i];

		if (mem->id == mem_id)
			return mem;
	}

	return NULL;
}

/* Add an immediate command to a transaction that zeroes a memory region */
static void
ipa_mem_zero_region_add(struct gsi_trans *trans, enum ipa_mem_id mem_id)
{
	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
	const struct ipa_mem *mem = ipa_mem_find(ipa, mem_id);
	dma_addr_t addr = ipa->zero_addr;

	if (!mem->size)
		return;

	ipa_cmd_dma_shared_mem_add(trans, mem->offset, mem->size, addr, true);
}

/**
 * ipa_mem_setup() - Set up IPA AP and modem shared memory areas
 * @ipa:	IPA pointer
 *
 * Set up the shared memory regions in IPA local memory.  This involves
 * zero-filling memory regions, and in the case of header memory, telling
 * the IPA where it's located.
 *
 * This function performs the initial setup of this memory.  If the modem
 * crashes, its regions are re-zeroed in ipa_mem_zero_modem().
 *
 * The AP informs the modem where its portions of memory are located
 * in a QMI exchange that occurs at modem startup.
 *
 * There is no need for a matching ipa_mem_teardown() function.
 *
 * Return:	0 if successful, or a negative error code
 */
int ipa_mem_setup(struct ipa *ipa)
{
	dma_addr_t addr = ipa->zero_addr;
	const struct reg *reg;
	const struct ipa_mem *mem;
	struct gsi_trans *trans;
	u32 offset;
	u16 size;
	u32 val;

	/* Get a transaction to define the header memory region and to zero
	 * the processing context and modem memory regions.
	 */
	trans = ipa_cmd_trans_alloc(ipa, 4);
	if (!trans) {
		dev_err(&ipa->pdev->dev, "no transaction for memory setup\n");
		return -EBUSY;
	}

	/* Initialize IPA-local header memory.  The AP header region, if
	 * present, is contiguous with and follows the modem header region,
	 * and they are initialized together.
	 */
	mem = ipa_mem_find(ipa, IPA_MEM_MODEM_HEADER);
	offset = mem->offset;
	size = mem->size;
	mem = ipa_mem_find(ipa, IPA_MEM_AP_HEADER);
	if (mem)
		size += mem->size;

	ipa_cmd_hdr_init_local_add(trans, offset, size, addr);

	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM_PROC_CTX);
	ipa_mem_zero_region_add(trans, IPA_MEM_AP_PROC_CTX);
	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM);

	gsi_trans_commit_wait(trans);

	/* Tell the hardware where the processing context area is located */
	mem = ipa_mem_find(ipa, IPA_MEM_MODEM_PROC_CTX);
	offset = ipa->mem_offset + mem->offset;

	reg = ipa_reg(ipa, LOCAL_PKT_PROC_CNTXT);
	val = reg_encode(reg, IPA_BASE_ADDR, offset);
	iowrite32(val, ipa->reg_virt + reg_offset(reg));

	return 0;
}

/* Is the given memory region ID is valid for the current IPA version? */
static bool ipa_mem_id_valid(struct ipa *ipa, enum ipa_mem_id mem_id)
{
	enum ipa_version version = ipa->version;

	switch (mem_id) {
	case IPA_MEM_UC_SHARED:
	case IPA_MEM_UC_INFO:
	case IPA_MEM_V4_FILTER_HASHED:
	case IPA_MEM_V4_FILTER:
	case IPA_MEM_V6_FILTER_HASHED:
	case IPA_MEM_V6_FILTER:
	case IPA_MEM_V4_ROUTE_HASHED:
	case IPA_MEM_V4_ROUTE:
	case IPA_MEM_V6_ROUTE_HASHED:
	case IPA_MEM_V6_ROUTE:
	case IPA_MEM_MODEM_HEADER:
	case IPA_MEM_AP_HEADER:
	case IPA_MEM_MODEM_PROC_CTX:
	case IPA_MEM_AP_PROC_CTX:
	case IPA_MEM_MODEM:
	case IPA_MEM_UC_EVENT_RING:
	case IPA_MEM_PDN_CONFIG:
	case IPA_MEM_STATS_QUOTA_MODEM:
	case IPA_MEM_STATS_QUOTA_AP:
	case IPA_MEM_END_MARKER:	/* pseudo region */
		break;

	case IPA_MEM_STATS_TETHERING:
	case IPA_MEM_STATS_DROP:
		if (version < IPA_VERSION_4_0)
			return false;
		break;

	case IPA_MEM_STATS_V4_FILTER:
	case IPA_MEM_STATS_V6_FILTER:
	case IPA_MEM_STATS_V4_ROUTE:
	case IPA_MEM_STATS_V6_ROUTE:
		if (version < IPA_VERSION_4_0 || version > IPA_VERSION_4_2)
			return false;
		break;

	case IPA_MEM_AP_V4_FILTER:
	case IPA_MEM_AP_V6_FILTER:
		if (version != IPA_VERSION_5_0)
			return false;
		break;

	case IPA_MEM_NAT_TABLE:
	case IPA_MEM_STATS_FILTER_ROUTE:
		if (version < IPA_VERSION_4_5)
			return false;
		break;

	default:
		return false;
	}

	return true;
}

/* Must the given memory region be present in the configuration? */
static bool ipa_mem_id_required(struct ipa *ipa, enum ipa_mem_id mem_id)
{
	switch (mem_id) {
	case IPA_MEM_UC_SHARED:
	case IPA_MEM_UC_INFO:
	case IPA_MEM_V4_FILTER_HASHED:
	case IPA_MEM_V4_FILTER:
	case IPA_MEM_V6_FILTER_HASHED:
	case IPA_MEM_V6_FILTER:
	case IPA_MEM_V4_ROUTE_HASHED:
	case IPA_MEM_V4_ROUTE:
	case IPA_MEM_V6_ROUTE_HASHED:
	case IPA_MEM_V6_ROUTE:
	case IPA_MEM_MODEM_HEADER:
	case IPA_MEM_MODEM_PROC_CTX:
	case IPA_MEM_AP_PROC_CTX:
	case IPA_MEM_MODEM:
		return true;

	case IPA_MEM_PDN_CONFIG:
	case IPA_MEM_STATS_QUOTA_MODEM:
		return ipa->version >= IPA_VERSION_4_0;

	case IPA_MEM_STATS_TETHERING:
		return ipa->version >= IPA_VERSION_4_0 &&
			ipa->version != IPA_VERSION_5_0;

	default:
		return false;		/* Anything else is optional */
	}
}

static bool ipa_mem_valid_one(struct ipa *ipa, const struct ipa_mem *mem)
{
	struct device *dev = &ipa->pdev->dev;
	enum ipa_mem_id mem_id = mem->id;
	u16 size_multiple;

	/* Make sure the memory region is valid for this version of IPA */
	if (!ipa_mem_id_valid(ipa, mem_id)) {
		dev_err(dev, "region id %u not valid\n", mem_id);
		return false;
	}

	if (!mem->size && !mem->canary_count) {
		dev_err(dev, "empty memory region %u\n", mem_id);
		return false;
	}

	/* Other than modem memory, sizes must be a multiple of 8 */
	size_multiple = mem_id == IPA_MEM_MODEM ? 4 : 8;
	if (mem->size % size_multiple)
		dev_err(dev, "region %u size not a multiple of %u bytes\n",
			mem_id, size_multiple);
	else if (mem->offset % 8)
		dev_err(dev, "region %u offset not 8-byte aligned\n", mem_id);
	else if (mem->offset < mem->canary_count * sizeof(__le32))
		dev_err(dev, "region %u offset too small for %hu canaries\n",
			mem_id, mem->canary_count);
	else if (mem_id == IPA_MEM_END_MARKER && mem->size)
		dev_err(dev, "non-zero end marker region size\n");
	else
		return true;

	return false;
}

/* Verify each defined memory region is valid. */
static bool ipa_mem_valid(struct ipa *ipa, const struct ipa_mem_data *mem_data)
{
	DECLARE_BITMAP(regions, IPA_MEM_COUNT) = { };
	struct device *dev = &ipa->pdev->dev;
	enum ipa_mem_id mem_id;
	u32 i;

	if (mem_data->local_count > IPA_MEM_COUNT) {
		dev_err(dev, "too many memory regions (%u > %u)\n",
			mem_data->local_count, IPA_MEM_COUNT);
		return false;
	}

	for (i = 0; i < mem_data->local_count; i++) {
		const struct ipa_mem *mem = &mem_data->local[i];

		if (__test_and_set_bit(mem->id, regions)) {
			dev_err(dev, "duplicate memory region %u\n", mem->id);
			return false;
		}

		/* Defined regions have non-zero size and/or canary count */
		if (!ipa_mem_valid_one(ipa, mem))
			return false;
	}

	/* Now see if any required regions are not defined */
	for_each_clear_bit(mem_id, regions, IPA_MEM_COUNT) {
		if (ipa_mem_id_required(ipa, mem_id))
			dev_err(dev, "required memory region %u missing\n",
				mem_id);
	}

	return true;
}

/* Do all memory regions fit within the IPA local memory? */
static bool ipa_mem_size_valid(struct ipa *ipa)
{
	struct device *dev = &ipa->pdev->dev;
	u32 limit = ipa->mem_size;
	u32 i;

	for (i = 0; i < ipa->mem_count; i++) {
		const struct ipa_mem *mem = &ipa->mem[i];

		if (mem->offset + mem->size <= limit)
			continue;

		dev_err(dev, "region %u ends beyond memory limit (0x%08x)\n",
			mem->id, limit);

		return false;
	}

	return true;
}

/**
 * ipa_mem_config() - Configure IPA shared memory
 * @ipa:	IPA pointer
 *
 * Return:	0 if successful, or a negative error code
 */
int ipa_mem_config(struct ipa *ipa)
{
	struct device *dev = &ipa->pdev->dev;
	const struct ipa_mem *mem;
	const struct reg *reg;
	dma_addr_t addr;
	u32 mem_size;
	void *virt;
	u32 val;
	u32 i;

	/* Check the advertised location and size of the shared memory area */
	reg = ipa_reg(ipa, SHARED_MEM_SIZE);
	val = ioread32(ipa->reg_virt + reg_offset(reg));

	/* The fields in the register are in 8 byte units */
	ipa->mem_offset = 8 * reg_decode(reg, MEM_BADDR, val);

	/* Make sure the end is within the region's mapped space */
	mem_size = 8 * reg_decode(reg, MEM_SIZE, val);

	/* If the sizes don't match, issue a warning */
	if (ipa->mem_offset + mem_size < ipa->mem_size) {
		dev_warn(dev, "limiting IPA memory size to 0x%08x\n",
			 mem_size);
		ipa->mem_size = mem_size;
	} else if (ipa->mem_offset + mem_size > ipa->mem_size) {
		dev_dbg(dev, "ignoring larger reported memory size: 0x%08x\n",
			mem_size);
	}

	/* We know our memory size; make sure regions are all in range */
	if (!ipa_mem_size_valid(ipa))
		return -EINVAL;

	/* Prealloc DMA memory for zeroing regions */
	virt = dma_alloc_coherent(dev, IPA_MEM_MAX, &addr, GFP_KERNEL);
	if (!virt)
		return -ENOMEM;
	ipa->zero_addr = addr;
	ipa->zero_virt = virt;
	ipa->zero_size = IPA_MEM_MAX;

	/* For each defined region, write "canary" values in the
	 * space prior to the region's base address if indicated.
	 */
	for (i = 0; i < ipa->mem_count; i++) {
		u16 canary_count = ipa->mem[i].canary_count;
		__le32 *canary;

		if (!canary_count)
			continue;

		/* Write canary values in the space before the region */
		canary = ipa->mem_virt + ipa->mem_offset + ipa->mem[i].offset;
		do
			*--canary = IPA_MEM_CANARY_VAL;
		while (--canary_count);
	}

	/* Verify the microcontroller ring alignment (if defined) */
	mem = ipa_mem_find(ipa, IPA_MEM_UC_EVENT_RING);
	if (mem && mem->offset % 1024) {
		dev_err(dev, "microcontroller ring not 1024-byte aligned\n");
		goto err_dma_free;
	}

	return 0;

err_dma_free:
	dma_free_coherent(dev, IPA_MEM_MAX, ipa->zero_virt, ipa->zero_addr);

	return -EINVAL;
}

/* Inverse of ipa_mem_config() */
void ipa_mem_deconfig(struct ipa *ipa)
{
	struct device *dev = &ipa->pdev->dev;

	dma_free_coherent(dev, ipa->zero_size, ipa->zero_virt, ipa->zero_addr);
	ipa->zero_size = 0;
	ipa->zero_virt = NULL;
	ipa->zero_addr = 0;
}

/**
 * ipa_mem_zero_modem() - Zero IPA-local memory regions owned by the modem
 * @ipa:	IPA pointer
 *
 * Zero regions of IPA-local memory used by the modem.  These are configured
 * (and initially zeroed) by ipa_mem_setup(), but if the modem crashes and
 * restarts via SSR we need to re-initialize them.  A QMI message tells the
 * modem where to find regions of IPA local memory it needs to know about
 * (these included).
 */
int ipa_mem_zero_modem(struct ipa *ipa)
{
	struct gsi_trans *trans;

	/* Get a transaction to zero the modem memory, modem header,
	 * and modem processing context regions.
	 */
	trans = ipa_cmd_trans_alloc(ipa, 3);
	if (!trans) {
		dev_err(&ipa->pdev->dev,
			"no transaction to zero modem memory\n");
		return -EBUSY;
	}

	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM_HEADER);
	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM_PROC_CTX);
	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM);

	gsi_trans_commit_wait(trans);

	return 0;
}

/**
 * ipa_imem_init() - Initialize IMEM memory used by the IPA
 * @ipa:	IPA pointer
 * @addr:	Physical address of the IPA region in IMEM
 * @size:	Size (bytes) of the IPA region in IMEM
 *
 * IMEM is a block of shared memory separate from system DRAM, and
 * a portion of this memory is available for the IPA to use.  The
 * modem accesses this memory directly, but the IPA accesses it
 * via the IOMMU, using the AP's credentials.
 *
 * If this region exists (size > 0) we map it for read/write access
 * through the IOMMU using the IPA device.
 *
 * Note: @addr and @size are not guaranteed to be page-aligned.
 */
static int ipa_imem_init(struct ipa *ipa, unsigned long addr, size_t size)
{
	struct device *dev = &ipa->pdev->dev;
	struct iommu_domain *domain;
	unsigned long iova;
	phys_addr_t phys;
	int ret;

	if (!size)
		return 0;	/* IMEM memory not used */

	domain = iommu_get_domain_for_dev(dev);
	if (!domain) {
		dev_err(dev, "no IOMMU domain found for IMEM\n");
		return -EINVAL;
	}

	/* Align the address down and the size up to page boundaries */
	phys = addr & PAGE_MASK;
	size = PAGE_ALIGN(size + addr - phys);
	iova = phys;	/* We just want a direct mapping */

	ret = iommu_map(domain, iova, phys, size, IOMMU_READ | IOMMU_WRITE,
			GFP_KERNEL);
	if (ret)
		return ret;

	ipa->imem_iova = iova;
	ipa->imem_size = size;

	return 0;
}

static void ipa_imem_exit(struct ipa *ipa)
{
	struct iommu_domain *domain;
	struct device *dev;

	if (!ipa->imem_size)
		return;

	dev = &ipa->pdev->dev;
	domain = iommu_get_domain_for_dev(dev);
	if (domain) {
		size_t size;

		size = iommu_unmap(domain, ipa->imem_iova, ipa->imem_size);
		if (size != ipa->imem_size)
			dev_warn(dev, "unmapped %zu IMEM bytes, expected %zu\n",
				 size, ipa->imem_size);
	} else {
		dev_err(dev, "couldn't get IPA IOMMU domain for IMEM\n");
	}

	ipa->imem_size = 0;
	ipa->imem_iova = 0;
}

/**
 * ipa_smem_init() - Initialize SMEM memory used by the IPA
 * @ipa:	IPA pointer
 * @item:	Item ID of SMEM memory
 * @size:	Size (bytes) of SMEM memory region
 *
 * SMEM is a managed block of shared DRAM, from which numbered "items"
 * can be allocated.  One item is designated for use by the IPA.
 *
 * The modem accesses SMEM memory directly, but the IPA accesses it
 * via the IOMMU, using the AP's credentials.
 *
 * If size provided is non-zero, we allocate it and map it for
 * access through the IOMMU.
 *
 * Note: @size and the item address are is not guaranteed to be page-aligned.
 */
static int ipa_smem_init(struct ipa *ipa, u32 item, size_t size)
{
	struct device *dev = &ipa->pdev->dev;
	struct iommu_domain *domain;
	unsigned long iova;
	phys_addr_t phys;
	phys_addr_t addr;
	size_t actual;
	void *virt;
	int ret;

	if (!size)
		return 0;	/* SMEM memory not used */

	/* SMEM is memory shared between the AP and another system entity
	 * (in this case, the modem).  An allocation from SMEM is persistent
	 * until the AP reboots; there is no way to free an allocated SMEM
	 * region.  Allocation only reserves the space; to use it you need
	 * to "get" a pointer it (this does not imply reference counting).
	 * The item might have already been allocated, in which case we
	 * use it unless the size isn't what we expect.
	 */
	ret = qcom_smem_alloc(QCOM_SMEM_HOST_MODEM, item, size);
	if (ret && ret != -EEXIST) {
		dev_err(dev, "error %d allocating size %zu SMEM item %u\n",
			ret, size, item);
		return ret;
	}

	/* Now get the address of the SMEM memory region */
	virt = qcom_smem_get(QCOM_SMEM_HOST_MODEM, item, &actual);
	if (IS_ERR(virt)) {
		ret = PTR_ERR(virt);
		dev_err(dev, "error %d getting SMEM item %u\n", ret, item);
		return ret;
	}

	/* In case the region was already allocated, verify the size */
	if (ret && actual != size) {
		dev_err(dev, "SMEM item %u has size %zu, expected %zu\n",
			item, actual, size);
		return -EINVAL;
	}

	domain = iommu_get_domain_for_dev(dev);
	if (!domain) {
		dev_err(dev, "no IOMMU domain found for SMEM\n");
		return -EINVAL;
	}

	/* Align the address down and the size up to a page boundary */
	addr = qcom_smem_virt_to_phys(virt);
	phys = addr & PAGE_MASK;
	size = PAGE_ALIGN(size + addr - phys);
	iova = phys;	/* We just want a direct mapping */

	ret = iommu_map(domain, iova, phys, size, IOMMU_READ | IOMMU_WRITE,
			GFP_KERNEL);
	if (ret)
		return ret;

	ipa->smem_iova = iova;
	ipa->smem_size = size;

	return 0;
}

static void ipa_smem_exit(struct ipa *ipa)
{
	struct device *dev = &ipa->pdev->dev;
	struct iommu_domain *domain;

	domain = iommu_get_domain_for_dev(dev);
	if (domain) {
		size_t size;

		size = iommu_unmap(domain, ipa->smem_iova, ipa->smem_size);
		if (size != ipa->smem_size)
			dev_warn(dev, "unmapped %zu SMEM bytes, expected %zu\n",
				 size, ipa->smem_size);

	} else {
		dev_err(dev, "couldn't get IPA IOMMU domain for SMEM\n");
	}

	ipa->smem_size = 0;
	ipa->smem_iova = 0;
}

/* Perform memory region-related initialization */
int ipa_mem_init(struct ipa *ipa, const struct ipa_mem_data *mem_data)
{
	struct device *dev = &ipa->pdev->dev;
	struct resource *res;
	int ret;

	/* Make sure the set of defined memory regions is valid */
	if (!ipa_mem_valid(ipa, mem_data))
		return -EINVAL;

	ipa->mem_count = mem_data->local_count;
	ipa->mem = mem_data->local;

	/* Check the route and filter table memory regions */
	if (!ipa_table_mem_valid(ipa, false))
		return -EINVAL;
	if (!ipa_table_mem_valid(ipa, true))
		return -EINVAL;

	ret = dma_set_mask_and_coherent(&ipa->pdev->dev, DMA_BIT_MASK(64));
	if (ret) {
		dev_err(dev, "error %d setting DMA mask\n", ret);
		return ret;
	}

	res = platform_get_resource_byname(ipa->pdev, IORESOURCE_MEM,
					   "ipa-shared");
	if (!res) {
		dev_err(dev,
			"DT error getting \"ipa-shared\" memory property\n");
		return -ENODEV;
	}

	ipa->mem_virt = memremap(res->start, resource_size(res), MEMREMAP_WC);
	if (!ipa->mem_virt) {
		dev_err(dev, "unable to remap \"ipa-shared\" memory\n");
		return -ENOMEM;
	}

	ipa->mem_addr = res->start;
	ipa->mem_size = resource_size(res);

	ret = ipa_imem_init(ipa, mem_data->imem_addr, mem_data->imem_size);
	if (ret)
		goto err_unmap;

	ret = ipa_smem_init(ipa, mem_data->smem_id, mem_data->smem_size);
	if (ret)
		goto err_imem_exit;

	return 0;

err_imem_exit:
	ipa_imem_exit(ipa);
err_unmap:
	memunmap(ipa->mem_virt);

	return ret;
}

/* Inverse of ipa_mem_init() */
void ipa_mem_exit(struct ipa *ipa)
{
	ipa_smem_exit(ipa);
	ipa_imem_exit(ipa);
	memunmap(ipa->mem_virt);
}