summaryrefslogtreecommitdiffstats
path: root/src/dpdk22/drivers/net/virtio/virtio_pci.c
blob: 2245becad95042f1be60394d77874aed514b6443 (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
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   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 Intel Corporation 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 <stdint.h>

#include "virtio_pci.h"
#include "virtio_logs.h"

static uint8_t vtpci_get_status(struct virtio_hw *);

void
vtpci_read_dev_config(struct virtio_hw *hw, uint64_t offset,
		void *dst, int length)
{
	uint64_t off;
	uint8_t *d;
	int size;

	off = VIRTIO_PCI_CONFIG(hw) + offset;
	for (d = dst; length > 0; d += size, off += size, length -= size) {
		if (length >= 4) {
			size = 4;
			*(uint32_t *)d = VIRTIO_READ_REG_4(hw, off);
		} else if (length >= 2) {
			size = 2;
			*(uint16_t *)d = VIRTIO_READ_REG_2(hw, off);
		} else {
			size = 1;
			*d = VIRTIO_READ_REG_1(hw, off);
		}
	}
}

void
vtpci_write_dev_config(struct virtio_hw *hw, uint64_t offset,
		void *src, int length)
{
	uint64_t off;
	uint8_t *s;
	int size;

	off = VIRTIO_PCI_CONFIG(hw) + offset;
	for (s = src; length > 0; s += size, off += size, length -= size) {
		if (length >= 4) {
			size = 4;
			VIRTIO_WRITE_REG_4(hw, off, *(uint32_t *)s);
		} else if (length >= 2) {
			size = 2;
			VIRTIO_WRITE_REG_2(hw, off, *(uint16_t *)s);
		} else {
			size = 1;
			VIRTIO_WRITE_REG_1(hw, off, *s);
		}
	}
}

uint32_t
vtpci_negotiate_features(struct virtio_hw *hw, uint32_t host_features)
{
	uint32_t features;
	/*
	 * Limit negotiated features to what the driver, virtqueue, and
	 * host all support.
	 */
	features = host_features & hw->guest_features;

	VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_GUEST_FEATURES, features);
	return features;
}


void
vtpci_reset(struct virtio_hw *hw)
{
	/*
	 * Setting the status to RESET sets the host device to
	 * the original, uninitialized state.
	 */
	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
	vtpci_get_status(hw);
}

void
vtpci_reinit_complete(struct virtio_hw *hw)
{
	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
}

static uint8_t
vtpci_get_status(struct virtio_hw *hw)
{
	return VIRTIO_READ_REG_1(hw, VIRTIO_PCI_STATUS);
}

void
vtpci_set_status(struct virtio_hw *hw, uint8_t status)
{
	if (status != VIRTIO_CONFIG_STATUS_RESET)
		status = (uint8_t)(status | vtpci_get_status(hw));

	VIRTIO_WRITE_REG_1(hw, VIRTIO_PCI_STATUS, status);
}

uint8_t
vtpci_isr(struct virtio_hw *hw)
{

	return VIRTIO_READ_REG_1(hw, VIRTIO_PCI_ISR);
}


/* Enable one vector (0) for Link State Intrerrupt */
uint16_t
vtpci_irq_config(struct virtio_hw *hw, uint16_t vec)
{
	VIRTIO_WRITE_REG_2(hw, VIRTIO_MSI_CONFIG_VECTOR, vec);
	return VIRTIO_READ_REG_2(hw, VIRTIO_MSI_CONFIG_VECTOR);
}