summaryrefslogtreecommitdiffstats
path: root/drivers/fpga/dfl-afu-region.c
blob: 0804b7a0c298617b0c3dc3be936324e3d2e5d598 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for FPGA Accelerated Function Unit (AFU) MMIO Region Management
 *
 * Copyright (C) 2017-2018 Intel Corporation, Inc.
 *
 * Authors:
 *   Wu Hao <hao.wu@intel.com>
 *   Xiao Guangrong <guangrong.xiao@linux.intel.com>
 */
#include "dfl-afu.h"

/**
 * afu_mmio_region_init - init function for afu mmio region support
 * @pdata: afu platform device's pdata.
 */
void afu_mmio_region_init(struct dfl_feature_platform_data *pdata)
{
	struct dfl_afu *afu = dfl_fpga_pdata_get_private(pdata);

	INIT_LIST_HEAD(&afu->regions);
}

#define for_each_region(region, afu)	\
	list_for_each_entry((region), &(afu)->regions, node)

static struct dfl_afu_mmio_region *get_region_by_index(struct dfl_afu *afu,
						       u32 region_index)
{
	struct dfl_afu_mmio_region *region;

	for_each_region(region, afu)
		if (region->index == region_index)
			return region;

	return NULL;
}

/**
 * afu_mmio_region_add - add a mmio region to given feature dev.
 *
 * @region_index: region index.
 * @region_size: region size.
 * @phys: region's physical address of this region.
 * @flags: region flags (access permission).
 *
 * Return: 0 on success, negative error code otherwise.
 */
int afu_mmio_region_add(struct dfl_feature_platform_data *pdata,
			u32 region_index, u64 region_size, u64 phys, u32 flags)
{
	struct dfl_afu_mmio_region *region;
	struct dfl_afu *afu;
	int ret = 0;

	region = devm_kzalloc(&pdata->dev->dev, sizeof(*region), GFP_KERNEL);
	if (!region)
		return -ENOMEM;

	region->index = region_index;
	region->size = region_size;
	region->phys = phys;
	region->flags = flags;

	mutex_lock(&pdata->lock);

	afu = dfl_fpga_pdata_get_private(pdata);

	/* check if @index already exists */
	if (get_region_by_index(afu, region_index)) {
		mutex_unlock(&pdata->lock);
		ret = -EEXIST;
		goto exit;
	}

	region_size = PAGE_ALIGN(region_size);
	region->offset = afu->region_cur_offset;
	list_add(&region->node, &afu->regions);

	afu->region_cur_offset += region_size;
	afu->num_regions++;
	mutex_unlock(&pdata->lock);

	return 0;

exit:
	devm_kfree(&pdata->dev->dev, region);
	return ret;
}

/**
 * afu_mmio_region_destroy - destroy all mmio regions under given feature dev.
 * @pdata: afu platform device's pdata.
 */
void afu_mmio_region_destroy(struct dfl_feature_platform_data *pdata)
{
	struct dfl_afu *afu = dfl_fpga_pdata_get_private(pdata);
	struct dfl_afu_mmio_region *tmp, *region;

	list_for_each_entry_safe(region, tmp, &afu->regions, node)
		devm_kfree(&pdata->dev->dev, region);
}

/**
 * afu_mmio_region_get_by_index - find an afu region by index.
 * @pdata: afu platform device's pdata.
 * @region_index: region index.
 * @pregion: ptr to region for result.
 *
 * Return: 0 on success, negative error code otherwise.
 */
int afu_mmio_region_get_by_index(struct dfl_feature_platform_data *pdata,
				 u32 region_index,
				 struct dfl_afu_mmio_region *pregion)
{
	struct dfl_afu_mmio_region *region;
	struct dfl_afu *afu;
	int ret = 0;

	mutex_lock(&pdata->lock);
	afu = dfl_fpga_pdata_get_private(pdata);
	region = get_region_by_index(afu, region_index);
	if (!region) {
		ret = -EINVAL;
		goto exit;
	}
	*pregion = *region;
exit:
	mutex_unlock(&pdata->lock);
	return ret;
}

/**
 * afu_mmio_region_get_by_offset - find an afu mmio region by offset and size
 *
 * @pdata: afu platform device's pdata.
 * @offset: region offset from start of the device fd.
 * @size: region size.
 * @pregion: ptr to region for result.
 *
 * Find the region which fully contains the region described by input
 * parameters (offset and size) from the feature dev's region linked list.
 *
 * Return: 0 on success, negative error code otherwise.
 */
int afu_mmio_region_get_by_offset(struct dfl_feature_platform_data *pdata,
				  u64 offset, u64 size,
				  struct dfl_afu_mmio_region *pregion)
{
	struct dfl_afu_mmio_region *region;
	struct dfl_afu *afu;
	int ret = 0;

	mutex_lock(&pdata->lock);
	afu = dfl_fpga_pdata_get_private(pdata);
	for_each_region(region, afu)
		if (region->offset <= offset &&
		    region->offset + region->size >= offset + size) {
			*pregion = *region;
			goto exit;
		}
	ret = -EINVAL;
exit:
	mutex_unlock(&pdata->lock);
	return ret;
}
OpenPOWER on IntegriCloud