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810626a8 DH |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.com> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | /* | |
23 | * Modeset Testing | |
24 | * The modeset tool attaches to the session of the caller and shows a | |
25 | * test-pattern on all displays of this session. It is meant as debugging tool | |
26 | * for the grdev infrastructure. | |
27 | */ | |
28 | ||
29 | #include <drm_fourcc.h> | |
30 | #include <errno.h> | |
31 | #include <getopt.h> | |
32 | #include <linux/kd.h> | |
33 | #include <linux/vt.h> | |
34 | #include <stdbool.h> | |
35 | #include <stdio.h> | |
36 | #include <stdlib.h> | |
37 | #include <string.h> | |
38 | #include <sys/ioctl.h> | |
39 | #include <sys/stat.h> | |
40 | #include <systemd/sd-bus.h> | |
41 | #include <systemd/sd-event.h> | |
42 | #include <systemd/sd-login.h> | |
43 | #include <termios.h> | |
44 | #include <unistd.h> | |
45 | #include "build.h" | |
46 | #include "bus-util.h" | |
47 | #include "event-util.h" | |
48 | #include "grdev.h" | |
49 | #include "grdev-internal.h" | |
50 | #include "macro.h" | |
51 | #include "sysview.h" | |
52 | #include "util.h" | |
53 | ||
54 | typedef struct Modeset Modeset; | |
55 | ||
56 | struct Modeset { | |
57 | char *session; | |
58 | char *seat; | |
59 | sd_event *event; | |
60 | sd_bus *bus; | |
61 | sd_event_source *exit_src; | |
62 | sysview_context *sysview; | |
63 | grdev_context *grdev; | |
64 | grdev_session *grdev_session; | |
65 | ||
66 | uint8_t r, g, b; | |
67 | bool r_up, g_up, b_up; | |
68 | ||
69 | bool my_tty : 1; | |
70 | bool managed : 1; | |
71 | }; | |
72 | ||
73 | static int modeset_exit_fn(sd_event_source *source, void *userdata) { | |
74 | Modeset *m = userdata; | |
75 | ||
76 | if (m->grdev_session) | |
77 | grdev_session_restore(m->grdev_session); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static Modeset *modeset_free(Modeset *m) { | |
83 | if (!m) | |
84 | return NULL; | |
85 | ||
86 | m->grdev_session = grdev_session_free(m->grdev_session); | |
87 | m->grdev = grdev_context_unref(m->grdev); | |
88 | m->sysview = sysview_context_free(m->sysview); | |
89 | m->exit_src = sd_event_source_unref(m->exit_src); | |
90 | m->bus = sd_bus_unref(m->bus); | |
91 | m->event = sd_event_unref(m->event); | |
92 | free(m->seat); | |
93 | free(m->session); | |
94 | free(m); | |
95 | ||
96 | return NULL; | |
97 | } | |
98 | ||
99 | DEFINE_TRIVIAL_CLEANUP_FUNC(Modeset*, modeset_free); | |
100 | ||
101 | static bool is_my_tty(const char *session) { | |
102 | unsigned int vtnr; | |
103 | struct stat st; | |
104 | long mode; | |
105 | int r; | |
106 | ||
107 | /* Using logind's Controller API is highly fragile if there is already | |
108 | * a session controller running. If it is registered as controller | |
109 | * itself, TakeControl will simply fail. But if its a legacy controller | |
110 | * that does not use logind's controller API, we must never register | |
111 | * our own controller. Otherwise, we really mess up the VT. Therefore, | |
112 | * only run in managed mode if there's no-one else. Furthermore, never | |
113 | * try to access graphics devices if there's someone else. Unlike input | |
114 | * devices, graphics devies cannot be shared easily. */ | |
115 | ||
116 | if (!isatty(1)) | |
117 | return false; | |
118 | ||
119 | if (!session) | |
120 | return false; | |
121 | ||
122 | r = sd_session_get_vt(session, &vtnr); | |
123 | if (r < 0 || vtnr < 1 || vtnr > 63) | |
124 | return false; | |
125 | ||
126 | mode = 0; | |
127 | r = ioctl(1, KDGETMODE, &mode); | |
128 | if (r < 0 || mode != KD_TEXT) | |
129 | return false; | |
130 | ||
131 | r = fstat(1, &st); | |
132 | if (r < 0 || minor(st.st_rdev) != vtnr) | |
133 | return false; | |
134 | ||
135 | return true; | |
136 | } | |
137 | ||
138 | static int modeset_new(Modeset **out) { | |
139 | _cleanup_(modeset_freep) Modeset *m = NULL; | |
140 | int r; | |
141 | ||
142 | assert(out); | |
143 | ||
144 | m = new0(Modeset, 1); | |
145 | if (!m) | |
146 | return log_oom(); | |
147 | ||
148 | r = sd_pid_get_session(getpid(), &m->session); | |
23bbb0de MS |
149 | if (r < 0) |
150 | return log_error_errno(r, "Cannot retrieve logind session: %m"); | |
810626a8 DH |
151 | |
152 | r = sd_session_get_seat(m->session, &m->seat); | |
23bbb0de MS |
153 | if (r < 0) |
154 | return log_error_errno(r, "Cannot retrieve seat of logind session: %m"); | |
810626a8 DH |
155 | |
156 | m->my_tty = is_my_tty(m->session); | |
157 | m->managed = m->my_tty && geteuid() > 0; | |
158 | ||
159 | m->r = rand() % 0xff; | |
160 | m->g = rand() % 0xff; | |
161 | m->b = rand() % 0xff; | |
162 | m->r_up = m->g_up = m->b_up = true; | |
163 | ||
164 | r = sd_event_default(&m->event); | |
165 | if (r < 0) | |
166 | return r; | |
167 | ||
168 | r = sd_bus_open_system(&m->bus); | |
169 | if (r < 0) | |
170 | return r; | |
171 | ||
172 | r = sd_bus_attach_event(m->bus, m->event, SD_EVENT_PRIORITY_NORMAL); | |
173 | if (r < 0) | |
174 | return r; | |
175 | ||
176 | r = sigprocmask_many(SIG_BLOCK, SIGTERM, SIGINT, -1); | |
177 | if (r < 0) | |
178 | return r; | |
179 | ||
180 | r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
181 | if (r < 0) | |
182 | return r; | |
183 | ||
184 | r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
185 | if (r < 0) | |
186 | return r; | |
187 | ||
188 | r = sd_event_add_exit(m->event, &m->exit_src, modeset_exit_fn, m); | |
189 | if (r < 0) | |
190 | return r; | |
191 | ||
192 | /* schedule before sd-bus close */ | |
193 | r = sd_event_source_set_priority(m->exit_src, -10); | |
194 | if (r < 0) | |
195 | return r; | |
196 | ||
197 | r = sysview_context_new(&m->sysview, | |
198 | SYSVIEW_CONTEXT_SCAN_LOGIND | | |
199 | SYSVIEW_CONTEXT_SCAN_DRM, | |
200 | m->event, | |
201 | m->bus, | |
202 | NULL); | |
203 | if (r < 0) | |
204 | return r; | |
205 | ||
206 | r = grdev_context_new(&m->grdev, m->event, m->bus); | |
207 | if (r < 0) | |
208 | return r; | |
209 | ||
210 | *out = m; | |
211 | m = NULL; | |
212 | return 0; | |
213 | } | |
214 | ||
215 | static uint8_t next_color(bool *up, uint8_t cur, unsigned int mod) { | |
216 | uint8_t next; | |
217 | ||
218 | /* generate smoothly morphing colors */ | |
219 | ||
220 | next = cur + (*up ? 1 : -1) * (rand() % mod); | |
221 | if ((*up && next < cur) || (!*up && next > cur)) { | |
222 | *up = !*up; | |
223 | next = cur; | |
224 | } | |
225 | ||
226 | return next; | |
227 | } | |
228 | ||
229 | static void modeset_draw(Modeset *m, const grdev_display_target *t) { | |
230 | uint32_t j, k, *b; | |
231 | uint8_t *l; | |
232 | ||
51cff8bd | 233 | assert(t->back->format == DRM_FORMAT_XRGB8888 || t->back->format == DRM_FORMAT_ARGB8888); |
810626a8 DH |
234 | assert(!t->rotate); |
235 | assert(!t->flip); | |
236 | ||
51cff8bd | 237 | l = t->back->maps[0]; |
810626a8 DH |
238 | for (j = 0; j < t->height; ++j) { |
239 | for (k = 0; k < t->width; ++k) { | |
240 | b = (uint32_t*)l; | |
241 | b[k] = (0xff << 24) | (m->r << 16) | (m->g << 8) | m->b; | |
242 | } | |
243 | ||
51cff8bd | 244 | l += t->back->strides[0]; |
810626a8 DH |
245 | } |
246 | } | |
247 | ||
248 | static void modeset_render(Modeset *m, grdev_display *d) { | |
249 | const grdev_display_target *t; | |
250 | ||
39cf40e8 DH |
251 | m->r = next_color(&m->r_up, m->r, 4); |
252 | m->g = next_color(&m->g_up, m->g, 3); | |
253 | m->b = next_color(&m->b_up, m->b, 2); | |
810626a8 | 254 | |
51cff8bd | 255 | GRDEV_DISPLAY_FOREACH_TARGET(d, t) { |
810626a8 | 256 | modeset_draw(m, t); |
66695cc3 | 257 | grdev_display_flip_target(d, t); |
810626a8 DH |
258 | } |
259 | ||
260 | grdev_session_commit(m->grdev_session); | |
261 | } | |
262 | ||
263 | static void modeset_grdev_fn(grdev_session *session, void *userdata, grdev_event *ev) { | |
264 | Modeset *m = userdata; | |
265 | ||
266 | switch (ev->type) { | |
267 | case GRDEV_EVENT_DISPLAY_ADD: | |
268 | grdev_display_enable(ev->display_add.display); | |
810626a8 DH |
269 | break; |
270 | case GRDEV_EVENT_DISPLAY_REMOVE: | |
271 | break; | |
272 | case GRDEV_EVENT_DISPLAY_CHANGE: | |
810626a8 DH |
273 | break; |
274 | case GRDEV_EVENT_DISPLAY_FRAME: | |
275 | modeset_render(m, ev->display_frame.display); | |
276 | break; | |
277 | } | |
278 | } | |
279 | ||
280 | static int modeset_sysview_fn(sysview_context *c, void *userdata, sysview_event *ev) { | |
281 | unsigned int flags, type; | |
282 | Modeset *m = userdata; | |
283 | sysview_device *d; | |
284 | const char *name; | |
285 | int r; | |
286 | ||
287 | switch (ev->type) { | |
288 | case SYSVIEW_EVENT_SESSION_FILTER: | |
289 | if (streq_ptr(m->session, ev->session_filter.id)) | |
290 | return 1; | |
291 | ||
292 | break; | |
293 | case SYSVIEW_EVENT_SESSION_ADD: | |
294 | assert(!m->grdev_session); | |
295 | ||
296 | name = sysview_session_get_name(ev->session_add.session); | |
297 | flags = 0; | |
298 | ||
299 | if (m->managed) | |
300 | flags |= GRDEV_SESSION_MANAGED; | |
301 | ||
302 | r = grdev_session_new(&m->grdev_session, | |
303 | m->grdev, | |
304 | flags, | |
305 | name, | |
306 | modeset_grdev_fn, | |
307 | m); | |
23bbb0de MS |
308 | if (r < 0) |
309 | return log_error_errno(r, "Cannot create grdev session: %m"); | |
810626a8 DH |
310 | |
311 | if (m->managed) { | |
312 | r = sysview_session_take_control(ev->session_add.session); | |
23bbb0de MS |
313 | if (r < 0) |
314 | return log_error_errno(r, "Cannot request session control: %m"); | |
810626a8 DH |
315 | } |
316 | ||
317 | grdev_session_enable(m->grdev_session); | |
318 | ||
319 | break; | |
320 | case SYSVIEW_EVENT_SESSION_REMOVE: | |
321 | if (!m->grdev_session) | |
322 | return 0; | |
323 | ||
324 | grdev_session_restore(m->grdev_session); | |
325 | grdev_session_disable(m->grdev_session); | |
326 | m->grdev_session = grdev_session_free(m->grdev_session); | |
c17091b7 DH |
327 | if (sd_event_get_exit_code(m->event, &r) == -ENODATA) |
328 | sd_event_exit(m->event, 0); | |
810626a8 DH |
329 | break; |
330 | case SYSVIEW_EVENT_SESSION_ATTACH: | |
331 | d = ev->session_attach.device; | |
332 | type = sysview_device_get_type(d); | |
333 | if (type == SYSVIEW_DEVICE_DRM) | |
334 | grdev_session_add_drm(m->grdev_session, sysview_device_get_ud(d)); | |
335 | ||
336 | break; | |
337 | case SYSVIEW_EVENT_SESSION_DETACH: | |
338 | d = ev->session_detach.device; | |
339 | type = sysview_device_get_type(d); | |
340 | if (type == SYSVIEW_DEVICE_DRM) | |
341 | grdev_session_remove_drm(m->grdev_session, sysview_device_get_ud(d)); | |
342 | ||
f6e3ee14 DH |
343 | break; |
344 | case SYSVIEW_EVENT_SESSION_REFRESH: | |
345 | d = ev->session_refresh.device; | |
346 | type = sysview_device_get_type(d); | |
347 | if (type == SYSVIEW_DEVICE_DRM) | |
348 | grdev_session_hotplug_drm(m->grdev_session, ev->session_refresh.ud); | |
349 | ||
810626a8 DH |
350 | break; |
351 | case SYSVIEW_EVENT_SESSION_CONTROL: | |
352 | r = ev->session_control.error; | |
23bbb0de MS |
353 | if (r < 0) |
354 | return log_error_errno(r, "Cannot acquire session control: %m"); | |
810626a8 DH |
355 | |
356 | r = ioctl(1, KDSKBMODE, K_UNICODE); | |
357 | if (r < 0) { | |
56f64d95 | 358 | log_error_errno(errno, "Cannot set K_UNICODE on stdout: %m"); |
810626a8 DH |
359 | return -errno; |
360 | } | |
361 | ||
362 | break; | |
363 | } | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static int modeset_run(Modeset *m) { | |
369 | struct termios in_attr, saved_attr; | |
370 | int r; | |
371 | ||
372 | assert(m); | |
373 | ||
374 | if (!m->my_tty) { | |
375 | log_warning("You need to run this program on a free VT"); | |
376 | return -EACCES; | |
377 | } | |
378 | ||
379 | if (!m->managed && geteuid() > 0) | |
380 | log_warning("You run in unmanaged mode without being root. This is likely to fail.."); | |
381 | ||
382 | printf("modeset - Show test pattern on selected graphics devices\n" | |
383 | " Running on seat '%s' in user-session '%s'\n" | |
384 | " Exit by pressing ^C\n\n", | |
385 | m->seat ? : "seat0", m->session ? : "<none>"); | |
386 | ||
387 | r = sysview_context_start(m->sysview, modeset_sysview_fn, m); | |
388 | if (r < 0) | |
389 | goto out; | |
390 | ||
391 | r = tcgetattr(0, &in_attr); | |
392 | if (r < 0) { | |
393 | r = -errno; | |
394 | goto out; | |
395 | } | |
396 | ||
397 | saved_attr = in_attr; | |
398 | in_attr.c_lflag &= ~ECHO; | |
399 | ||
400 | r = tcsetattr(0, TCSANOW, &in_attr); | |
401 | if (r < 0) { | |
402 | r = -errno; | |
403 | goto out; | |
404 | } | |
405 | ||
406 | r = sd_event_loop(m->event); | |
407 | tcsetattr(0, TCSANOW, &saved_attr); | |
408 | printf("exiting..\n"); | |
409 | ||
410 | out: | |
411 | sysview_context_stop(m->sysview); | |
412 | return r; | |
413 | } | |
414 | ||
415 | static int help(void) { | |
416 | printf("%s [OPTIONS...]\n\n" | |
417 | "Show test pattern on all selected graphics devices.\n\n" | |
418 | " -h --help Show this help\n" | |
419 | " --version Show package version\n" | |
420 | , program_invocation_short_name); | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | static int parse_argv(int argc, char *argv[]) { | |
426 | enum { | |
427 | ARG_VERSION = 0x100, | |
428 | }; | |
429 | static const struct option options[] = { | |
430 | { "help", no_argument, NULL, 'h' }, | |
431 | { "version", no_argument, NULL, ARG_VERSION }, | |
432 | {}, | |
433 | }; | |
434 | int c; | |
435 | ||
436 | assert(argc >= 0); | |
437 | assert(argv); | |
438 | ||
439 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) | |
440 | switch (c) { | |
441 | case 'h': | |
442 | help(); | |
443 | return 0; | |
444 | ||
445 | case ARG_VERSION: | |
446 | puts(PACKAGE_STRING); | |
447 | puts(SYSTEMD_FEATURES); | |
448 | return 0; | |
449 | ||
450 | case '?': | |
451 | return -EINVAL; | |
452 | ||
453 | default: | |
454 | assert_not_reached("Unhandled option"); | |
455 | } | |
456 | ||
457 | if (argc > optind) { | |
458 | log_error("Too many arguments"); | |
459 | return -EINVAL; | |
460 | } | |
461 | ||
462 | return 1; | |
463 | } | |
464 | ||
465 | int main(int argc, char *argv[]) { | |
466 | _cleanup_(modeset_freep) Modeset *m = NULL; | |
467 | int r; | |
468 | ||
469 | log_set_target(LOG_TARGET_AUTO); | |
470 | log_parse_environment(); | |
471 | log_open(); | |
472 | ||
ef309a68 | 473 | initialize_srand(); |
810626a8 DH |
474 | |
475 | r = parse_argv(argc, argv); | |
476 | if (r <= 0) | |
477 | goto finish; | |
478 | ||
479 | r = modeset_new(&m); | |
480 | if (r < 0) | |
481 | goto finish; | |
482 | ||
483 | r = modeset_run(m); | |
484 | ||
485 | finish: | |
486 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
487 | } |