summaryrefslogtreecommitdiff
path: root/tests/device_reset.c
blob: e6a468e6fa4bf6547cd123e041a6eeffc942bb1d (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
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
// SPDX-License-Identifier: MIT
/*
 * Copyright(c) 2020 Intel Corporation. All rights reserved.
 */
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <signal.h>

#include "i915/gem.h"
#include "igt.h"
#include "igt_device_scan.h"
#include "igt_sysfs.h"
#include "igt_kmod.h"

IGT_TEST_DESCRIPTION("Examine behavior of a driver on device sysfs reset");


#define DEV_PATH_LEN 80
#define DEV_BUS_ADDR_LEN 13 /* addr has form 0000:00:00.0 */

/**
 * Helper structure containing file descriptors
 * and bus address related to tested device
 */
struct device_fds {
	struct {
		int dev;
		int dev_dir;
		int drv_dir;
	} fds;
	char dev_bus_addr[DEV_BUS_ADDR_LEN];
	bool snd_unload;
};

static int __open_sysfs_dir(int fd, const char* path)
{
	int sysfs;

	sysfs = igt_sysfs_open(fd);
	if (sysfs < 0) {
		return -1;
	}

	fd = openat(sysfs, path, O_DIRECTORY);
	close(sysfs);
	return fd;
}

static int open_device_sysfs_dir(int fd)
{
	return __open_sysfs_dir(fd, "device");
}

static int open_driver_sysfs_dir(int fd)
{
	return __open_sysfs_dir(fd, "device/driver");
}

/**
 * device_sysfs_path:
 * @fd: opened device file descriptor
 * @path: buffer to store sysfs path to device directory
 *
 * Returns:
 * On successfull path resolution sysfs path to device directory,
 * NULL otherwise
 */
static char *device_sysfs_path(int fd, char *path)
{
	char sysfs[DEV_PATH_LEN];

	if (!igt_sysfs_path(fd, sysfs, sizeof(sysfs)))
		return NULL;

	if (DEV_PATH_LEN <= (strlen(sysfs) + strlen("/device")))
		return NULL;

	strcat(sysfs, "/device");

	return realpath(sysfs, path);
}

static void init_device_fds(struct device_fds *dev)
{
	char dev_path[PATH_MAX];
	char *addr_pos;
	uint32_t devid;

	igt_debug("open device\n");
	/**
	 * As subtests must be able to close examined devices
	 * completely, don't use drm_open_driver() as it keeps
	 * a device file descriptor open for exit handler use.
	 */
	dev->fds.dev = __drm_open_driver(DRIVER_ANY);
	igt_assert_fd(dev->fds.dev);
	if (is_i915_device(dev->fds.dev)) {
		igt_require_gem(dev->fds.dev);

		devid = intel_get_drm_devid(dev->fds.dev);
		if ((IS_HASWELL(devid) || IS_BROADWELL(devid) ||
		     IS_DG1(devid)) &&
		     (igt_kmod_is_loaded("snd_hda_intel"))) {
			igt_debug("Enable WA to unload snd driver\n");
			dev->snd_unload = true;
		}
	}

	igt_assert(device_sysfs_path(dev->fds.dev, dev_path));
	addr_pos = strrchr(dev_path, '/');
	igt_assert(addr_pos);
	igt_assert_eq(sizeof(dev->dev_bus_addr) - 1,
		      snprintf(dev->dev_bus_addr, sizeof(dev->dev_bus_addr),
			       "%s", addr_pos + 1));

	dev->fds.dev_dir = open_device_sysfs_dir(dev->fds.dev);
	igt_assert_fd(dev->fds.dev_dir);

	dev->fds.drv_dir = open_driver_sysfs_dir(dev->fds.dev);
	igt_assert_fd(dev->fds.drv_dir);
}

static int close_if_opened(int *fd)
{
	int rc = 0;

	if (fd && *fd != -1) {
		rc = close(*fd);
		*fd = -1;
	}
	return rc;
}

static void cleanup_device_fds(struct device_fds *dev)
{
	igt_ignore_warn(close_if_opened(&dev->fds.dev));
	igt_ignore_warn(close_if_opened(&dev->fds.dev_dir));
	igt_ignore_warn(close_if_opened(&dev->fds.drv_dir));
}

/**
 * is_sysfs_reset_supported:
 * @fd: opened device file descriptor
 *
 * Check if device supports reset based on sysfs file presence.
 *
 * Returns:
 * True if device supports reset, false otherwise.
 */
static bool is_sysfs_reset_supported(int fd)
{
	struct stat st;
	int rc;
	int sysfs;
	int reset_fd = -1;

	sysfs = igt_sysfs_open(fd);

	if (sysfs >= 0) {
		reset_fd = openat(sysfs, "device/reset", O_WRONLY);
		close(sysfs);
	}

	if (reset_fd < 0)
		return false;

	rc = fstat(reset_fd, &st);
	close(reset_fd);

	if (rc || !S_ISREG(st.st_mode))
		return false;

	return true;
}

/* Unbind the driver from the device */
static void driver_unbind(struct device_fds *dev)
{
	/**
	 * FIXME: Unbinding the i915 driver on affected platforms with
	 * audio results in a kernel WARN on "i915 raw-wakerefs=1
	 * wakelocks=1 on cleanup". The below CI friendly user level
	 * workaround to unload and de-couple audio from IGT testing,
	 * prevents the warning from appearing. Drop this hack as soon
	 * as this is fixed in the kernel. unbind/re-bind validation
	 * on audio side is not robust and we could have potential
	 * failures blocking display CI, currently this seems to the
	 * safest and easiest way out.
	 */
	if (dev->snd_unload) {
		igt_terminate_process(SIGTERM, "alsactl");

		/* unbind snd_hda_intel */
		kick_snd_hda_intel();

		if (igt_kmod_unload("snd_hda_intel", 0)) {
			dev->snd_unload = false;
			igt_warn("Could not unload snd_hda_intel\n");
			igt_kmod_list_loaded();
			igt_lsof("/dev/snd");
			igt_skip("Audio is in use, skipping\n");
		} else {
			igt_warn("Preventively unloaded snd_hda_intel\n");
		}
	}

	igt_debug("unbind the driver from the device\n");
	igt_assert(igt_sysfs_set(dev->fds.drv_dir, "unbind",
		   dev->dev_bus_addr));
}

/* Re-bind the driver to the device */
static void driver_bind(struct device_fds *dev)
{
	igt_debug("rebind the driver to the device\n");
	igt_abort_on_f(!igt_sysfs_set(dev->fds.drv_dir, "bind",
		       dev->dev_bus_addr), "driver rebind failed");

	if (dev->snd_unload)
		igt_kmod_load("snd_hda_intel", NULL);
}

/* Initiate device reset */
static void initiate_device_reset(struct device_fds *dev)
{
	igt_debug("reset device\n");
	igt_assert(igt_sysfs_set(dev->fds.dev_dir, "reset", "1"));
}

static bool is_i915_wedged(int i915)
{
	int err = 0;

	if (ioctl(i915, DRM_IOCTL_I915_GEM_THROTTLE))
		err = -errno;
	return err == -EIO;
}

/**
 * healthcheck:
 * @dev: structure with device descriptor, if descriptor equals -1
 * 	 the device is reopened
 */
static void healthcheck(struct device_fds *dev)
{
	if (dev->fds.dev == -1) {
		/* refresh device list */
		igt_devices_scan(true);
		igt_debug("reopen the device\n");
		dev->fds.dev = __drm_open_driver(DRIVER_ANY);
	}
	igt_assert_fd(dev->fds.dev);

	if (is_i915_device(dev->fds.dev))
		igt_assert(!is_i915_wedged(dev->fds.dev));
}

/**
 * set_device_filter:
 *
 * Sets device filter to ensure subtests always reopen the same device
 *
 * @dev_path: path to device under tests
 */
static void set_device_filter(const char* dev_path)
{
#define FILTER_PREFIX_LEN 4
	char filter[PATH_MAX + FILTER_PREFIX_LEN];

	igt_assert_lt(FILTER_PREFIX_LEN, snprintf(filter, sizeof(filter),
						  "sys:%s", dev_path));
	igt_device_filter_free_all();
	igt_assert_eq(igt_device_filter_add(filter), 1);
}

static void unbind_reset_rebind(struct device_fds *dev)
{
	igt_debug("close the device\n");
	close_if_opened(&dev->fds.dev);

	driver_unbind(dev);

	initiate_device_reset(dev);

	driver_bind(dev);
}

igt_main
{
	struct device_fds dev = { .fds = {-1, -1, -1}, .dev_bus_addr = {0}, };

	igt_fixture {
		char dev_path[PATH_MAX];

		igt_debug("opening device\n");
		init_device_fds(&dev);

		/* Make sure subtests always reopen the same device */
		igt_assert(device_sysfs_path(dev.fds.dev, dev_path));
		set_device_filter(dev_path);

		igt_skip_on(!is_sysfs_reset_supported(dev.fds.dev));

		igt_set_timeout(60, "device reset tests timed out after 60s");
	}

	igt_describe("Unbinds driver from device, initiates reset"
		     " then rebinds driver to device");
	igt_subtest("unbind-reset-rebind") {
		unbind_reset_rebind(&dev);
		healthcheck(&dev);
	}

	igt_describe("Resets device with bound driver");
	igt_subtest("reset-bound") {
		initiate_device_reset(&dev);
		healthcheck(&dev);
	}

	igt_fixture {
		igt_reset_timeout();
		cleanup_device_fds(&dev);
	}
}