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
|
/*
* Sample server to be tested with samples/client.c
*
* Copyright (c) 2020, Nutanix Inc. All rights reserved.
* Author: Thanos Makatos <thanos@nutanix.com>
*
* 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 Nutanix 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 <COPYRIGHT HOLDER> 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 <err.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include <assert.h>
#include "../lib/muser.h"
struct server_data {
time_t bar0;
uint8_t *bar1;
};
static void
_log(void *pvt, lm_log_lvl_t lvl __attribute__((unused)), char const *msg)
{
fprintf(stderr, "server: %s\n", msg);
}
/* returns time in seconds since Epoch */
ssize_t
bar0_access(void *pvt, char * const buf, size_t count, loff_t offset,
const bool is_write)
{
struct server_data *server_data = pvt;
if (count != sizeof(time_t) || offset != 0) {
errno = EINVAL;
return -1;
}
if (is_write) {
memcpy(&server_data->bar0, buf, count);
} else {
time_t delta = time(NULL) - server_data->bar0;
memcpy(buf, &delta, count);
}
return count;
}
ssize_t
bar1_access(void *pvt, char * const buf, size_t count, loff_t offset,
const bool is_write)
{
assert(false);
}
bool irq_triggered = false;
static void _sa_handler(int signum)
{
int _errno = errno;
if (signum == SIGUSR1) {
irq_triggered = true;
}
errno = _errno;
}
static int
unmap_dma(void *pvt __attribute__((unused)),
uint64_t iova __attribute__((unused)))
{
}
unsigned long map_area(void *pvt, unsigned long off, unsigned long len)
{
assert(false);
}
int main(int argc, char *argv[])
{
int ret;
bool trans_sock = false, verbose = false;
char opt;
struct sigaction act = {.sa_handler = _sa_handler};
struct server_data server_data;
int nr_sparse_areas = 2, size = 1024, i;
struct lm_sparse_mmap_areas *sparse_areas;
lm_ctx_t *lm_ctx;
while ((opt = getopt(argc, argv, "v")) != -1) {
switch (opt) {
case 'v':
verbose = true;
break;
default: /* '?' */
err(EXIT_FAILURE, "Usage: %s [-d] <IOMMU group>\n", argv[0]);
}
}
if (optind >= argc) {
err(EXIT_FAILURE, "missing MUSER device UUID");
}
server_data.bar1 = malloc(sysconf(_SC_PAGESIZE));
if (server_data.bar1 == NULL) {
err(EXIT_FAILURE, "BAR1");
}
sparse_areas = calloc(1, sizeof(*sparse_areas) +
(nr_sparse_areas * sizeof(struct lm_mmap_area)));
if (sparse_areas == NULL) {
err(EXIT_FAILURE, "MMAP sparse areas ENOMEM");
goto out;
}
sparse_areas->nr_mmap_areas = nr_sparse_areas;
for (i = 0; i < nr_sparse_areas; i++) {
sparse_areas->areas[i].start += size;
sparse_areas->areas[i].size = size;
}
lm_dev_info_t dev_info = {
.trans = LM_TRANS_SOCK,
.log = verbose ? _log : NULL,
.log_lvl = LM_DBG,
.pci_info = {
.reg_info[LM_DEV_BAR0_REG_IDX] = {
.flags = LM_REG_FLAG_RW,
.size = sizeof(time_t),
.fn = &bar0_access
},
.reg_info[LM_DEV_BAR1_REG_IDX] = {
.flags = LM_REG_FLAG_RW,
.size = sysconf(_SC_PAGESIZE),
.fn = &bar1_access,
.mmap_areas = sparse_areas,
.map = map_area
},
.irq_count[LM_DEV_INTX_IRQ_IDX] = 1,
},
.uuid = argv[optind],
.unmap_dma = unmap_dma,
.pvt = &server_data
};
sigemptyset(&act.sa_mask);
if (sigaction(SIGUSR1, &act, NULL) == -1) {
err(EXIT_FAILURE, "warning: failed to register signal handler: %m\n");
}
lm_ctx = lm_ctx_create(&dev_info);
if (lm_ctx == NULL) {
if (errno == EINTR) {
goto out;
}
err(EXIT_FAILURE, "failed to initialize device emulation: %m\n");
}
do {
ret = lm_ctx_drive(lm_ctx);
if (ret == -EINTR) {
if (irq_triggered) {
irq_triggered = false;
lm_irq_trigger(lm_ctx, 0);
ret = 0;
}
}
} while (ret == 0);
if (ret != -ENOTCONN && ret != -EINTR) {
fprintf(stderr, "failed to realize device emulation: %m\n");
}
out:
lm_ctx_destroy(lm_ctx);
free(server_data.bar1);
free(sparse_areas);
return ret;
}
/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */
|
