summaryrefslogtreecommitdiff
path: root/lib/igt_device.c
blob: 07bb0a0d4191da743769b6409de32ee99dd54357 (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
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
235
236
237
238
/*
 * Copyright © 2017 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 */
#include <sys/types.h>
#include <fcntl.h>

#include <sys/stat.h>
#include <sys/sysmacros.h>
#include "igt.h"
#include "igt_device.h"
#include "igt_sysfs.h"

int __igt_device_set_master(int fd)
{
	int err;

	err = 0;
	if (drmIoctl(fd, DRM_IOCTL_SET_MASTER, NULL)) {
		err = -errno;
		igt_assume(err);
	}

	errno = 0;
	return err;
}

static void show_clients(int fd)
{
	__igt_debugfs_dump(fd, "clients", IGT_LOG_WARN);
}

/**
 * igt_device_set_master: Set the device fd to be DRM master
 * @fd: the device
 *
 * Tell the kernel to make this device fd become DRM master or skip the test.
 */
void igt_device_set_master(int fd)
{
	if (__igt_device_set_master(fd)) {
		show_clients(fd);
		igt_require_f(__igt_device_set_master(fd) == 0,
			      "Can't become DRM master, "
			      "please check if no other DRM client is running.\n");
	}
}

int __igt_device_drop_master(int fd)
{
	int err;

	err = 0;
	if (drmIoctl(fd, DRM_IOCTL_DROP_MASTER, NULL)) {
		err = -errno;
		igt_assume(err);
	}

	errno = 0;
	return err;
}

/**
 * igt_device_drop_master: Drop DRM master
 * @fd: the device
 *
 * Tell the kernel we no longer want this device fd to be the DRM master;
 * asserting that we lose the privilege. Return if we are master already.
 */
void igt_device_drop_master(int fd)
{
	/* Check if we are master before dropping */
	if (__igt_device_set_master(fd))
		return;

	if (__igt_device_drop_master(fd)) {
		show_clients(fd);
		igt_assert_f(__igt_device_drop_master(fd) == 0,
			      "Failed to drop DRM master.\n");
	}
}

/**
 * igt_device_get_card_index:
 * @fd: the device
 *
 * Returns:
 * Index (N) of /dev/dri/cardN or /dev/dri/renderDN corresponding with fd.
 *
 */
int igt_device_get_card_index(int fd)
{
	struct stat st;

	igt_fail_on(fstat(fd, &st) || !S_ISCHR(st.st_mode));

	return minor(st.st_rdev);
}

#define IGT_DEV_PATH_LEN 80

static bool igt_device_is_pci(int fd)
{
	char path[IGT_DEV_PATH_LEN];
	char *subsystem;
	int sysfs;
	int len;

	sysfs = igt_sysfs_open(fd);
	if (sysfs == -1)
		return false;

	len = readlinkat(sysfs, "device/subsystem", path, sizeof(path) - 1);
	close(sysfs);
	if (len == -1)
		return false;
	path[len] = '\0';

	subsystem = strrchr(path, '/');
	if (!subsystem)
		return false;

	return strcmp(subsystem, "/pci") == 0;
}

struct igt_pci_addr {
	unsigned int domain;
	unsigned int bus;
	unsigned int device;
	unsigned int function;
};

static int igt_device_get_pci_addr(int fd, struct igt_pci_addr *pci)
{
	char path[IGT_DEV_PATH_LEN];
	char *buf;
	int sysfs;
	int len;

	if (!igt_device_is_pci(fd))
		return -ENODEV;

	sysfs = igt_sysfs_open(fd);
	if (sysfs == -1)
		return -ENOENT;

	len = readlinkat(sysfs, "device", path, sizeof(path) - 1);
	close(sysfs);
	if (len == -1)
		return -ENOENT;
	path[len] = '\0';

	buf = strrchr(path, '/');
	if (!buf)
		return -ENOENT;

	if (sscanf(buf, "/%4x:%2x:%2x.%2x",
		   &pci->domain, &pci->bus,
		   &pci->device, &pci->function) != 4) {
		igt_warn("Unable to extract PCI device address from '%s'\n", buf);
		return -ENOENT;
	}

	return 0;
}

static struct pci_device *__igt_device_get_pci_device(int fd)
{
	struct igt_pci_addr pci_addr;
	struct pci_device *pci_dev;

	if (igt_device_get_pci_addr(fd, &pci_addr)) {
		igt_warn("Unable to find device PCI address\n");
		return NULL;
	}

	if (pci_system_init()) {
		igt_warn("Couldn't initialize PCI system\n");
		return NULL;
	}

	pci_dev = pci_device_find_by_slot(pci_addr.domain,
					  pci_addr.bus,
					  pci_addr.device,
					  pci_addr.function);
	if (!pci_dev) {
		igt_warn("Couldn't find PCI device %04x:%02x:%02x:%02x\n",
			 pci_addr.domain, pci_addr.bus,
			 pci_addr.device, pci_addr.function);
		return NULL;
	}

	if (pci_device_probe(pci_dev)) {
		igt_warn("Couldn't probe PCI device\n");
		return NULL;
	}

	return pci_dev;
}

/**
 * igt_device_get_pci_device:
 *
 * @fd: the device
 *
 * Looks up the main graphics pci device using libpciaccess.
 *
 * Returns:
 * The pci_device, skips the test on any failures.
 */
struct pci_device *igt_device_get_pci_device(int fd)
{
	struct pci_device *pci_dev;

	pci_dev = __igt_device_get_pci_device(fd);
	igt_require(pci_dev);

	return pci_dev;
}