summaryrefslogtreecommitdiff
path: root/lib/librte_eal/common/eal_common_bus.c
blob: 4638e78d2e023d544687945edcc2d68e28a85f3e (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
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2016 NXP
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of NXP nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <string.h>
#include <sys/queue.h>

#include <rte_bus.h>

#include "eal_private.h"

struct rte_bus_list rte_bus_list =
	TAILQ_HEAD_INITIALIZER(rte_bus_list);

void
rte_bus_register(struct rte_bus *bus)
{
	RTE_VERIFY(bus);
	RTE_VERIFY(bus->name && strlen(bus->name));
	/* A bus should mandatorily have the scan implemented */
	RTE_VERIFY(bus->scan);
	RTE_VERIFY(bus->probe);

	TAILQ_INSERT_TAIL(&rte_bus_list, bus, next);
	RTE_LOG(DEBUG, EAL, "Registered [%s] bus.\n", bus->name);
}

void
rte_bus_unregister(struct rte_bus *bus)
{
	TAILQ_REMOVE(&rte_bus_list, bus, next);
	RTE_LOG(DEBUG, EAL, "Unregistered [%s] bus.\n", bus->name);
}

/* Scan all the buses for registered devices */
int
rte_bus_scan(void)
{
	int ret;
	struct rte_bus *bus = NULL;

	TAILQ_FOREACH(bus, &rte_bus_list, next) {
		ret = bus->scan();
		if (ret) {
			RTE_LOG(ERR, EAL, "Scan for (%s) bus failed.\n",
				bus->name);
			return ret;
		}
	}

	return 0;
}

/* Probe all devices of all buses */
int
rte_bus_probe(void)
{
	int ret;
	struct rte_bus *bus;

	TAILQ_FOREACH(bus, &rte_bus_list, next) {
		ret = bus->probe();
		if (ret) {
			RTE_LOG(ERR, EAL, "Bus (%s) probe failed.\n",
				bus->name);
			return ret;
		}
	}

	return 0;
}

/* Dump information of a single bus */
static int
bus_dump_one(FILE *f, struct rte_bus *bus)
{
	int ret;

	/* For now, dump only the bus name */
	ret = fprintf(f, " %s\n", bus->name);

	/* Error in case of inability in writing to stream */
	if (ret < 0)
		return ret;

	return 0;
}

void
rte_bus_dump(FILE *f)
{
	int ret;
	struct rte_bus *bus;

	TAILQ_FOREACH(bus, &rte_bus_list, next) {
		ret = bus_dump_one(f, bus);
		if (ret) {
			RTE_LOG(ERR, EAL, "Unable to write to stream (%d)\n",
				ret);
			break;
		}
	}
}