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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright (c) 2018, Microsoft Corporation.
* All Rights Reserved.
*/
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <rte_eal.h>
#include <rte_tailq.h>
#include <rte_log.h>
#include <rte_malloc.h>
#include <rte_bus.h>
#include <rte_bus_vmbus.h>
#include "private.h"
static struct rte_tailq_elem vmbus_tailq = {
.name = "VMBUS_RESOURCE_LIST",
};
EAL_REGISTER_TAILQ(vmbus_tailq)
struct mapped_vmbus_resource *
vmbus_uio_find_resource(const struct rte_vmbus_device *dev)
{
struct mapped_vmbus_resource *uio_res;
struct mapped_vmbus_res_list *uio_res_list =
RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
if (dev == NULL)
return NULL;
TAILQ_FOREACH(uio_res, uio_res_list, next) {
if (rte_uuid_compare(uio_res->id, dev->device_id) == 0)
return uio_res;
}
return NULL;
}
static int
vmbus_uio_map_secondary(struct rte_vmbus_device *dev)
{
struct mapped_vmbus_resource *uio_res;
struct vmbus_channel *chan;
int fd, i;
uio_res = vmbus_uio_find_resource(dev);
if (!uio_res) {
VMBUS_LOG(ERR, "Cannot find resource for device");
return -1;
}
/* open /dev/uioX */
fd = open(uio_res->path, O_RDWR);
if (fd < 0) {
VMBUS_LOG(ERR, "Cannot open %s: %s",
uio_res->path, strerror(errno));
return -1;
}
for (i = 0; i != uio_res->nb_maps; i++) {
void *mapaddr;
off_t offset = i * PAGE_SIZE;
mapaddr = vmbus_map_resource(uio_res->maps[i].addr,
fd, offset,
uio_res->maps[i].size, 0);
if (mapaddr == uio_res->maps[i].addr)
continue; /* successful map */
if (mapaddr == MAP_FAILED)
VMBUS_LOG(ERR,
"mmap resource %d in secondary failed", i);
else {
VMBUS_LOG(ERR,
"mmap resource %d address mismatch", i);
vmbus_unmap_resource(mapaddr, uio_res->maps[i].size);
}
close(fd);
return -1;
}
/* fd is not needed in slave process, close it */
close(fd);
dev->primary = uio_res->primary;
if (!dev->primary) {
VMBUS_LOG(ERR, "missing primary channel");
return -1;
}
STAILQ_FOREACH(chan, &dev->primary->subchannel_list, next) {
if (vmbus_uio_map_secondary_subchan(dev, chan) != 0) {
VMBUS_LOG(ERR, "cannot map secondary subchan");
return -1;
}
}
return 0;
}
static int
vmbus_uio_map_primary(struct rte_vmbus_device *dev)
{
int i, ret;
struct mapped_vmbus_resource *uio_res = NULL;
struct mapped_vmbus_res_list *uio_res_list =
RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
/* allocate uio resource */
ret = vmbus_uio_alloc_resource(dev, &uio_res);
if (ret)
return ret;
/* Map the resources */
for (i = 0; i < VMBUS_MAX_RESOURCE; i++) {
/* stop at empty BAR */
if (dev->resource[i].len == 0)
break;
ret = vmbus_uio_map_resource_by_index(dev, i, uio_res, 0);
if (ret)
goto error;
}
uio_res->nb_maps = i;
TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
return 0;
error:
while (--i >= 0) {
vmbus_unmap_resource(uio_res->maps[i].addr,
(size_t)uio_res->maps[i].size);
}
vmbus_uio_free_resource(dev, uio_res);
return -1;
}
/* map the VMBUS resource of a VMBUS device in virtual memory */
int
vmbus_uio_map_resource(struct rte_vmbus_device *dev)
{
struct mapped_vmbus_resource *uio_res;
int ret;
/* TODO: handle rescind */
dev->intr_handle.fd = -1;
dev->intr_handle.uio_cfg_fd = -1;
dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
/* secondary processes - use already recorded details */
if (rte_eal_process_type() != RTE_PROC_PRIMARY)
ret = vmbus_uio_map_secondary(dev);
else
ret = vmbus_uio_map_primary(dev);
if (ret != 0)
return ret;
uio_res = vmbus_uio_find_resource(dev);
if (!uio_res) {
VMBUS_LOG(ERR, "can not find resources!");
return -EIO;
}
if (uio_res->nb_maps <= HV_MON_PAGE_MAP) {
VMBUS_LOG(ERR, "VMBUS: only %u resources found!",
uio_res->nb_maps);
return -EINVAL;
}
dev->int_page = (uint32_t *)((char *)uio_res->maps[HV_INT_PAGE_MAP].addr
+ (PAGE_SIZE >> 1));
dev->monitor_page = uio_res->maps[HV_MON_PAGE_MAP].addr;
return 0;
}
static void
vmbus_uio_unmap(struct mapped_vmbus_resource *uio_res)
{
int i;
if (uio_res == NULL)
return;
for (i = 0; i != uio_res->nb_maps; i++) {
vmbus_unmap_resource(uio_res->maps[i].addr,
(size_t)uio_res->maps[i].size);
}
}
/* unmap the VMBUS resource of a VMBUS device in virtual memory */
void
vmbus_uio_unmap_resource(struct rte_vmbus_device *dev)
{
struct mapped_vmbus_resource *uio_res;
struct mapped_vmbus_res_list *uio_res_list =
RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
if (dev == NULL)
return;
/* find an entry for the device */
uio_res = vmbus_uio_find_resource(dev);
if (uio_res == NULL)
return;
/* secondary processes - just free maps */
if (rte_eal_process_type() != RTE_PROC_PRIMARY)
return vmbus_uio_unmap(uio_res);
TAILQ_REMOVE(uio_res_list, uio_res, next);
/* unmap all resources */
vmbus_uio_unmap(uio_res);
/* free uio resource */
rte_free(uio_res);
/* close fd if in primary process */
close(dev->intr_handle.fd);
if (dev->intr_handle.uio_cfg_fd >= 0) {
close(dev->intr_handle.uio_cfg_fd);
dev->intr_handle.uio_cfg_fd = -1;
}
dev->intr_handle.fd = -1;
dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
}
|
