summaryrefslogtreecommitdiff
path: root/drivers/net/ipa/ipa_resource.c
blob: 82c88a744d1024fff2648071f254edc8dc0916bf (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
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
 * Copyright (C) 2018-2022 Linaro Ltd.
 */

#include <linux/types.h>
#include <linux/kernel.h>

#include "ipa.h"
#include "ipa_data.h"
#include "ipa_reg.h"
#include "ipa_resource.h"

/**
 * DOC: IPA Resources
 *
 * The IPA manages a set of resources internally for various purposes.
 * A given IPA version has a fixed number of resource types, and a fixed
 * total number of resources of each type.  "Source" resource types
 * are separate from "destination" resource types.
 *
 * Each version of IPA also has some number of resource groups.  Each
 * endpoint is assigned to a resource group, and all endpoints in the
 * same group share pools of each type of resource.  A subset of the
 * total resources of each type is assigned for use by each group.
 */

static bool ipa_resource_limits_valid(struct ipa *ipa,
				      const struct ipa_resource_data *data)
{
	u32 group_count;
	u32 i;
	u32 j;

	/* We program at most 8 source or destination resource group limits */
	BUILD_BUG_ON(IPA_RESOURCE_GROUP_MAX > 8);

	group_count = data->rsrc_group_src_count;
	if (!group_count || group_count > IPA_RESOURCE_GROUP_MAX)
		return false;

	/* Return an error if a non-zero resource limit is specified
	 * for a resource group not supported by hardware.
	 */
	for (i = 0; i < data->resource_src_count; i++) {
		const struct ipa_resource *resource;

		resource = &data->resource_src[i];
		for (j = group_count; j < IPA_RESOURCE_GROUP_MAX; j++)
			if (resource->limits[j].min || resource->limits[j].max)
				return false;
	}

	group_count = data->rsrc_group_dst_count;
	if (!group_count || group_count > IPA_RESOURCE_GROUP_MAX)
		return false;

	for (i = 0; i < data->resource_dst_count; i++) {
		const struct ipa_resource *resource;

		resource = &data->resource_dst[i];
		for (j = group_count; j < IPA_RESOURCE_GROUP_MAX; j++)
			if (resource->limits[j].min || resource->limits[j].max)
				return false;
	}

	return true;
}

static void
ipa_resource_config_common(struct ipa *ipa, u32 resource_type,
			   const struct reg *reg,
			   const struct ipa_resource_limits *xlimits,
			   const struct ipa_resource_limits *ylimits)
{
	u32 val;

	val = reg_encode(reg, X_MIN_LIM, xlimits->min);
	val |= reg_encode(reg, X_MAX_LIM, xlimits->max);
	if (ylimits) {
		val |= reg_encode(reg, Y_MIN_LIM, ylimits->min);
		val |= reg_encode(reg, Y_MAX_LIM, ylimits->max);
	}

	iowrite32(val, ipa->reg_virt + reg_n_offset(reg, resource_type));
}

static void ipa_resource_config_src(struct ipa *ipa, u32 resource_type,
				    const struct ipa_resource_data *data)
{
	u32 group_count = data->rsrc_group_src_count;
	const struct ipa_resource_limits *ylimits;
	const struct ipa_resource *resource;
	const struct reg *reg;

	resource = &data->resource_src[resource_type];

	reg = ipa_reg(ipa, SRC_RSRC_GRP_01_RSRC_TYPE);
	ylimits = group_count == 1 ? NULL : &resource->limits[1];
	ipa_resource_config_common(ipa, resource_type, reg,
				   &resource->limits[0], ylimits);
	if (group_count < 3)
		return;

	reg = ipa_reg(ipa, SRC_RSRC_GRP_23_RSRC_TYPE);
	ylimits = group_count == 3 ? NULL : &resource->limits[3];
	ipa_resource_config_common(ipa, resource_type, reg,
				   &resource->limits[2], ylimits);
	if (group_count < 5)
		return;

	reg = ipa_reg(ipa, SRC_RSRC_GRP_45_RSRC_TYPE);
	ylimits = group_count == 5 ? NULL : &resource->limits[5];
	ipa_resource_config_common(ipa, resource_type, reg,
				   &resource->limits[4], ylimits);
	if (group_count < 7)
		return;

	reg = ipa_reg(ipa, SRC_RSRC_GRP_67_RSRC_TYPE);
	ylimits = group_count == 7 ? NULL : &resource->limits[7];
	ipa_resource_config_common(ipa, resource_type, reg,
				   &resource->limits[6], ylimits);
}

static void ipa_resource_config_dst(struct ipa *ipa, u32 resource_type,
				    const struct ipa_resource_data *data)
{
	u32 group_count = data->rsrc_group_dst_count;
	const struct ipa_resource_limits *ylimits;
	const struct ipa_resource *resource;
	const struct reg *reg;

	resource = &data->resource_dst[resource_type];

	reg = ipa_reg(ipa, DST_RSRC_GRP_01_RSRC_TYPE);
	ylimits = group_count == 1 ? NULL : &resource->limits[1];
	ipa_resource_config_common(ipa, resource_type, reg,
				   &resource->limits[0], ylimits);
	if (group_count < 3)
		return;

	reg = ipa_reg(ipa, DST_RSRC_GRP_23_RSRC_TYPE);
	ylimits = group_count == 3 ? NULL : &resource->limits[3];
	ipa_resource_config_common(ipa, resource_type, reg,
				   &resource->limits[2], ylimits);
	if (group_count < 5)
		return;

	reg = ipa_reg(ipa, DST_RSRC_GRP_45_RSRC_TYPE);
	ylimits = group_count == 5 ? NULL : &resource->limits[5];
	ipa_resource_config_common(ipa, resource_type, reg,
				   &resource->limits[4], ylimits);
	if (group_count < 7)
		return;

	reg = ipa_reg(ipa, DST_RSRC_GRP_67_RSRC_TYPE);
	ylimits = group_count == 7 ? NULL : &resource->limits[7];
	ipa_resource_config_common(ipa, resource_type, reg,
				   &resource->limits[6], ylimits);
}

/* Configure resources; there is no ipa_resource_deconfig() */
int ipa_resource_config(struct ipa *ipa, const struct ipa_resource_data *data)
{
	u32 i;

	if (!ipa_resource_limits_valid(ipa, data))
		return -EINVAL;

	for (i = 0; i < data->resource_src_count; i++)
		ipa_resource_config_src(ipa, i, data);

	for (i = 0; i < data->resource_dst_count; i++)
		ipa_resource_config_dst(ipa, i, data);

	return 0;
}