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
|
/*
* viracpi.c: ACPI table(s) parser
*
* Copyright (C) 2023 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <inttypes.h>
#include <fcntl.h>
#include <unistd.h>
#define LIBVIRT_VIRACPIPRIV_H_ALLOW
#include "internal.h"
#include "viracpi.h"
#include "viracpipriv.h"
#include "viralloc.h"
#include "virerror.h"
#include "virfile.h"
#include "virlog.h"
#define VIR_FROM_THIS VIR_FROM_NONE
VIR_LOG_INIT("util.acpi");
typedef struct virIORTHeader virIORTHeader;
struct virIORTHeader {
uint32_t signature;
uint32_t length;
uint8_t revision;
uint8_t checksum;
char oem_id[6];
char oem_table_id[8];
char oem_revision[4];
char creator_id[4];
char creator_revision[4];
/* Technically, the following are not part of header, but
* they immediately follow the header and are in the table
* exactly once. */
uint32_t nnodes;
uint32_t nodes_offset;
/* Here follows reserved and padding fields. Ain't nobody's
* interested in that. */
} ATTRIBUTE_PACKED;
VIR_ENUM_IMPL(virIORTNodeType,
VIR_IORT_NODE_TYPE_LAST,
"ITS Group",
"Named Component",
"Root Complex",
"SMMUv1 or SMMUv2",
"SMMUv3",
"PMCG",
"Memory range");
static int
virAcpiParseIORTNodeHeader(int fd,
const char *filename,
virIORTNodeHeader *nodeHeader)
{
g_autofree char *nodeHeaderBuf = NULL;
const char *typeStr = NULL;
int nodeHeaderLen;
nodeHeaderLen = virFileReadHeaderFD(fd, sizeof(*nodeHeader), &nodeHeaderBuf);
if (nodeHeaderLen < 0) {
virReportSystemError(errno,
_("cannot read node header '%1$s'"),
filename);
return -1;
}
if (nodeHeaderLen != sizeof(*nodeHeader)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("IORT table node header ended early"));
return -1;
}
memcpy(nodeHeader, nodeHeaderBuf, nodeHeaderLen);
typeStr = virIORTNodeTypeTypeToString(nodeHeader->type);
VIR_DEBUG("IORT node header: type = %" PRIu8 " (%s) len = %" PRIu16,
nodeHeader->type, NULLSTR(typeStr), nodeHeader->len);
/* Basic sanity check. While there's a type specific data
* that follows the node header, the node length should be at
* least size of header itself. */
if (nodeHeader->len < sizeof(*nodeHeader)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("IORT table node type %1$s has invalid length: got %2$u, expected at least %3$zu"),
NULLSTR(typeStr), (unsigned int)nodeHeader->len, sizeof(*nodeHeader));
return -1;
}
return 0;
}
static ssize_t
virAcpiParseIORTNodes(int fd,
const char *filename,
const virIORTHeader *header,
virIORTNodeHeader **nodesRet)
{
g_autofree virIORTNodeHeader *nodes = NULL;
size_t nnodes = 0;
off_t pos;
/* Firstly, reset position to the start of nodes. */
if ((pos = lseek(fd, header->nodes_offset, SEEK_SET)) < 0) {
virReportSystemError(errno,
_("cannot seek in '%1$s'"),
filename);
return -1;
}
for (; pos < header->length;) {
virIORTNodeHeader node;
if (virAcpiParseIORTNodeHeader(fd, filename, &node) < 0)
return -1;
if ((pos = lseek(fd, pos + node.len, SEEK_SET)) < 0) {
virReportSystemError(errno,
_("cannot seek in '%1$s'"),
filename);
return -1;
}
VIR_APPEND_ELEMENT(nodes, nnodes, node);
}
*nodesRet = g_steal_pointer(&nodes);
return nnodes;
}
ssize_t
virAcpiParseIORT(virIORTNodeHeader **nodesRet,
const char *filename)
{
VIR_AUTOCLOSE fd = -1;
g_autofree char *headerBuf = NULL;
int headerLen;
virIORTHeader header;
if ((fd = open(filename, O_RDONLY)) < 0) {
virReportSystemError(errno,
_("cannot open '%1$s'"),
filename);
return -1;
}
headerLen = virFileReadHeaderFD(fd, sizeof(header), &headerBuf);
if (headerLen < 0) {
virReportSystemError(errno,
_("cannot read header '%1$s'"),
filename);
return -1;
}
if (headerLen != sizeof(header)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("IORT table header ended early"));
return -1;
}
memcpy(&header, headerBuf, headerLen);
VIR_DEBUG("IORT header: len = %" PRIu32 " revision = %" PRIu8
" nnodes = %" PRIu32 " OEM = %s",
header.length, header.revision,
header.nnodes, header.oem_id);
return virAcpiParseIORTNodes(fd, filename, &header, nodesRet);
}
#define IORT_PATH "/sys/firmware/acpi/tables/IORT"
/**
* virAcpiHasSMMU:
*
* Parse IORT table trying to find SMMU node entry.
* Since IORT is ARM specific ACPI table, it doesn't make much
* sense to call this function on other platforms and expect
* sensible result.
*
* Returns: 0 if no SMMU node was found,
* 1 if a SMMU node was found (i.e. host supports SMMU),
* -1 otherwise (with error reported).
*/
int
virAcpiHasSMMU(void)
{
g_autofree virIORTNodeHeader *nodes = NULL;
ssize_t nnodes = -1;
size_t i;
if ((nnodes = virAcpiParseIORT(&nodes, IORT_PATH)) < 0)
return -1;
for (i = 0; i < nnodes; i++) {
if (nodes[i].type == VIR_IORT_NODE_TYPE_SMMUV1_OR_SMMUV2 ||
nodes[i].type == VIR_IORT_NODE_TYPE_SMMUV3) {
return 1;
}
}
return 0;
}
|
