1 /*-
2 * Copyright 2003 Eric Anholt
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
20 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <anholt@FreeBSD.org>
25 *
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 /** @file drm_irq.c
32 * Support code for handling setup/teardown of interrupt handlers and
33 * handing interrupt handlers off to the drivers.
34 */
35
36 #include "dev/drm/drmP.h"
37 #include "dev/drm/drm.h"
38
drm_irq_by_busid(struct drm_device * dev,void * data,struct drm_file * file_priv)39 int drm_irq_by_busid(struct drm_device *dev, void *data,
40 struct drm_file *file_priv)
41 {
42 struct drm_irq_busid *irq = data;
43
44 if ((irq->busnum >> 8) != dev->pci_domain ||
45 (irq->busnum & 0xff) != dev->pci_bus ||
46 irq->devnum != dev->pci_slot ||
47 irq->funcnum != dev->pci_func)
48 return EINVAL;
49
50 irq->irq = dev->irq;
51
52 DRM_DEBUG("%d:%d:%d => IRQ %d\n",
53 irq->busnum, irq->devnum, irq->funcnum, irq->irq);
54
55 return 0;
56 }
57
58 static irqreturn_t
drm_irq_handler_wrap(DRM_IRQ_ARGS)59 drm_irq_handler_wrap(DRM_IRQ_ARGS)
60 {
61 struct drm_device *dev = arg;
62
63 DRM_SPINLOCK(&dev->irq_lock);
64 dev->driver->irq_handler(arg);
65 DRM_SPINUNLOCK(&dev->irq_lock);
66 }
67
vblank_disable_fn(void * arg)68 static void vblank_disable_fn(void *arg)
69 {
70 struct drm_device *dev = (struct drm_device *)arg;
71 int i;
72
73 /* Make sure that we are called with the lock held */
74 mtx_assert(&dev->vbl_lock, MA_OWNED);
75
76 if (callout_pending(&dev->vblank_disable_timer)) {
77 /* callout was reset */
78 return;
79 }
80 if (!callout_active(&dev->vblank_disable_timer)) {
81 /* callout was stopped */
82 return;
83 }
84 callout_deactivate(&dev->vblank_disable_timer);
85
86 DRM_DEBUG("vblank_disable: %s\n", dev->vblank_disable_allowed ?
87 "allowed" : "denied");
88 if (!dev->vblank_disable_allowed)
89 return;
90
91 for (i = 0; i < dev->num_crtcs; i++) {
92 if (dev->vblank[i].refcount == 0 &&
93 dev->vblank[i].enabled && !dev->vblank[i].inmodeset) {
94 DRM_DEBUG("disabling vblank on crtc %d\n", i);
95 dev->vblank[i].last =
96 dev->driver->get_vblank_counter(dev, i);
97 dev->driver->disable_vblank(dev, i);
98 dev->vblank[i].enabled = 0;
99 }
100 }
101 }
102
drm_vblank_cleanup(struct drm_device * dev)103 void drm_vblank_cleanup(struct drm_device *dev)
104 {
105 /* Bail if the driver didn't call drm_vblank_init() */
106 if (dev->num_crtcs == 0)
107 return;
108
109 DRM_SPINLOCK(&dev->vbl_lock);
110 callout_stop(&dev->vblank_disable_timer);
111 DRM_SPINUNLOCK(&dev->vbl_lock);
112
113 callout_drain(&dev->vblank_disable_timer);
114
115 DRM_SPINLOCK(&dev->vbl_lock);
116 vblank_disable_fn((void *)dev);
117 DRM_SPINUNLOCK(&dev->vbl_lock);
118
119 free(dev->vblank, DRM_MEM_DRIVER);
120
121 dev->num_crtcs = 0;
122 }
123
drm_vblank_init(struct drm_device * dev,int num_crtcs)124 int drm_vblank_init(struct drm_device *dev, int num_crtcs)
125 {
126 int i, ret = ENOMEM;
127
128 callout_init_mtx(&dev->vblank_disable_timer, &dev->vbl_lock, 0);
129 dev->num_crtcs = num_crtcs;
130
131 dev->vblank = malloc(sizeof(struct drm_vblank_info) * num_crtcs,
132 DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
133 if (!dev->vblank)
134 goto err;
135
136 DRM_DEBUG("\n");
137
138 /* Zero per-crtc vblank stuff */
139 DRM_SPINLOCK(&dev->vbl_lock);
140 for (i = 0; i < num_crtcs; i++) {
141 DRM_INIT_WAITQUEUE(&dev->vblank[i].queue);
142 dev->vblank[i].refcount = 0;
143 atomic_store_rel_32(&dev->vblank[i].count, 0);
144 }
145 dev->vblank_disable_allowed = 0;
146 DRM_SPINUNLOCK(&dev->vbl_lock);
147
148 return 0;
149
150 err:
151 drm_vblank_cleanup(dev);
152 return ret;
153 }
154
drm_irq_install(struct drm_device * dev)155 int drm_irq_install(struct drm_device *dev)
156 {
157 int crtc, retcode;
158
159 if (dev->irq == 0 || dev->dev_private == NULL)
160 return EINVAL;
161
162 DRM_DEBUG("irq=%d\n", dev->irq);
163
164 DRM_LOCK();
165 if (dev->irq_enabled) {
166 DRM_UNLOCK();
167 return EBUSY;
168 }
169 dev->irq_enabled = 1;
170
171 dev->context_flag = 0;
172
173 /* Before installing handler */
174 dev->driver->irq_preinstall(dev);
175 DRM_UNLOCK();
176
177 /* Install handler */
178 retcode = bus_setup_intr(dev->device, dev->irqr,
179 INTR_TYPE_TTY | INTR_MPSAFE,
180 NULL, drm_irq_handler_wrap, dev, &dev->irqh);
181 if (retcode != 0)
182 goto err;
183
184 /* After installing handler */
185 DRM_LOCK();
186 dev->driver->irq_postinstall(dev);
187 DRM_UNLOCK();
188 if (dev->driver->enable_vblank) {
189 DRM_SPINLOCK(&dev->vbl_lock);
190 for( crtc = 0 ; crtc < dev->num_crtcs ; crtc++) {
191 if (dev->driver->enable_vblank(dev, crtc) == 0) {
192 dev->vblank[crtc].enabled = 1;
193 }
194 }
195 callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ,
196 (timeout_t *)vblank_disable_fn, (void *)dev);
197 DRM_SPINUNLOCK(&dev->vbl_lock);
198 }
199
200 return 0;
201 err:
202 DRM_LOCK();
203 dev->irq_enabled = 0;
204 DRM_UNLOCK();
205
206 return retcode;
207 }
208
drm_irq_uninstall(struct drm_device * dev)209 int drm_irq_uninstall(struct drm_device *dev)
210 {
211 int crtc;
212
213 if (!dev->irq_enabled)
214 return EINVAL;
215
216 dev->irq_enabled = 0;
217
218 /*
219 * Wake up any waiters so they don't hang.
220 */
221 DRM_SPINLOCK(&dev->vbl_lock);
222 for (crtc = 0; crtc < dev->num_crtcs; crtc++) {
223 if (dev->vblank[crtc].enabled) {
224 DRM_WAKEUP(&dev->vblank[crtc].queue);
225 dev->vblank[crtc].last =
226 dev->driver->get_vblank_counter(dev, crtc);
227 dev->vblank[crtc].enabled = 0;
228 }
229 }
230 DRM_SPINUNLOCK(&dev->vbl_lock);
231
232 DRM_DEBUG("irq=%d\n", dev->irq);
233
234 dev->driver->irq_uninstall(dev);
235
236 DRM_UNLOCK();
237 bus_teardown_intr(dev->device, dev->irqr, dev->irqh);
238 DRM_LOCK();
239
240 return 0;
241 }
242
drm_control(struct drm_device * dev,void * data,struct drm_file * file_priv)243 int drm_control(struct drm_device *dev, void *data, struct drm_file *file_priv)
244 {
245 struct drm_control *ctl = data;
246 int err;
247
248 switch (ctl->func) {
249 case DRM_INST_HANDLER:
250 /* Handle drivers whose DRM used to require IRQ setup but the
251 * no longer does.
252 */
253 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
254 return 0;
255 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
256 ctl->irq != dev->irq)
257 return EINVAL;
258 return drm_irq_install(dev);
259 case DRM_UNINST_HANDLER:
260 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
261 return 0;
262 DRM_LOCK();
263 err = drm_irq_uninstall(dev);
264 DRM_UNLOCK();
265 return err;
266 default:
267 return EINVAL;
268 }
269 }
270
drm_vblank_count(struct drm_device * dev,int crtc)271 u32 drm_vblank_count(struct drm_device *dev, int crtc)
272 {
273 return atomic_load_acq_32(&dev->vblank[crtc].count);
274 }
275
drm_update_vblank_count(struct drm_device * dev,int crtc)276 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
277 {
278 u32 cur_vblank, diff;
279
280 /*
281 * Interrupts were disabled prior to this call, so deal with counter
282 * wrap if needed.
283 * NOTE! It's possible we lost a full dev->max_vblank_count events
284 * here if the register is small or we had vblank interrupts off for
285 * a long time.
286 */
287 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
288 diff = cur_vblank - dev->vblank[crtc].last;
289 if (cur_vblank < dev->vblank[crtc].last) {
290 diff += dev->max_vblank_count;
291
292 DRM_DEBUG("vblank[%d].last=0x%x, cur_vblank=0x%x => diff=0x%x\n",
293 crtc, dev->vblank[crtc].last, cur_vblank, diff);
294 }
295
296 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
297 crtc, diff);
298
299 atomic_add_rel_32(&dev->vblank[crtc].count, diff);
300 }
301
drm_vblank_get(struct drm_device * dev,int crtc)302 int drm_vblank_get(struct drm_device *dev, int crtc)
303 {
304 int ret = 0;
305
306 /* Make sure that we are called with the lock held */
307 mtx_assert(&dev->vbl_lock, MA_OWNED);
308
309 /* Going from 0->1 means we have to enable interrupts again */
310 if (++dev->vblank[crtc].refcount == 1 &&
311 !dev->vblank[crtc].enabled) {
312 ret = dev->driver->enable_vblank(dev, crtc);
313 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
314 if (ret)
315 --dev->vblank[crtc].refcount;
316 else {
317 dev->vblank[crtc].enabled = 1;
318 drm_update_vblank_count(dev, crtc);
319 }
320 }
321
322 if (dev->vblank[crtc].enabled)
323 dev->vblank[crtc].last =
324 dev->driver->get_vblank_counter(dev, crtc);
325
326 return ret;
327 }
328
drm_vblank_put(struct drm_device * dev,int crtc)329 void drm_vblank_put(struct drm_device *dev, int crtc)
330 {
331 /* Make sure that we are called with the lock held */
332 mtx_assert(&dev->vbl_lock, MA_OWNED);
333
334 KASSERT(dev->vblank[crtc].refcount > 0,
335 ("invalid refcount"));
336
337 /* Last user schedules interrupt disable */
338 if (--dev->vblank[crtc].refcount == 0)
339 callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ,
340 (timeout_t *)vblank_disable_fn, (void *)dev);
341 }
342
drm_modeset_ctl(struct drm_device * dev,void * data,struct drm_file * file_priv)343 int drm_modeset_ctl(struct drm_device *dev, void *data,
344 struct drm_file *file_priv)
345 {
346 struct drm_modeset_ctl *modeset = data;
347 int crtc, ret = 0;
348
349 /* If drm_vblank_init() hasn't been called yet, just no-op */
350 if (!dev->num_crtcs)
351 goto out;
352
353 crtc = modeset->crtc;
354 if (crtc < 0 || crtc >= dev->num_crtcs) {
355 ret = EINVAL;
356 goto out;
357 }
358
359 /*
360 * To avoid all the problems that might happen if interrupts
361 * were enabled/disabled around or between these calls, we just
362 * have the kernel take a reference on the CRTC (just once though
363 * to avoid corrupting the count if multiple, mismatch calls occur),
364 * so that interrupts remain enabled in the interim.
365 */
366 switch (modeset->cmd) {
367 case _DRM_PRE_MODESET:
368 DRM_DEBUG("pre-modeset, crtc %d\n", crtc);
369 DRM_SPINLOCK(&dev->vbl_lock);
370 if (!dev->vblank[crtc].inmodeset) {
371 dev->vblank[crtc].inmodeset = 0x1;
372 if (drm_vblank_get(dev, crtc) == 0)
373 dev->vblank[crtc].inmodeset |= 0x2;
374 }
375 DRM_SPINUNLOCK(&dev->vbl_lock);
376 break;
377 case _DRM_POST_MODESET:
378 DRM_DEBUG("post-modeset, crtc %d\n", crtc);
379 DRM_SPINLOCK(&dev->vbl_lock);
380 if (dev->vblank[crtc].inmodeset) {
381 if (dev->vblank[crtc].inmodeset & 0x2)
382 drm_vblank_put(dev, crtc);
383 dev->vblank[crtc].inmodeset = 0;
384 }
385 dev->vblank_disable_allowed = 1;
386 DRM_SPINUNLOCK(&dev->vbl_lock);
387 break;
388 default:
389 ret = EINVAL;
390 break;
391 }
392
393 out:
394 return ret;
395 }
396
drm_wait_vblank(struct drm_device * dev,void * data,struct drm_file * file_priv)397 int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv)
398 {
399 union drm_wait_vblank *vblwait = data;
400 unsigned int flags, seq, crtc;
401 int ret = 0;
402
403 if (!dev->irq_enabled)
404 return EINVAL;
405
406 if (vblwait->request.type &
407 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
408 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
409 vblwait->request.type,
410 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
411 return EINVAL;
412 }
413
414 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
415 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
416
417 if (crtc >= dev->num_crtcs)
418 return EINVAL;
419
420 DRM_SPINLOCK(&dev->vbl_lock);
421 ret = drm_vblank_get(dev, crtc);
422 DRM_SPINUNLOCK(&dev->vbl_lock);
423 if (ret) {
424 DRM_ERROR("failed to acquire vblank counter, %d\n", ret);
425 return ret;
426 }
427 seq = drm_vblank_count(dev, crtc);
428
429 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
430 case _DRM_VBLANK_RELATIVE:
431 vblwait->request.sequence += seq;
432 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
433 case _DRM_VBLANK_ABSOLUTE:
434 break;
435 default:
436 ret = EINVAL;
437 goto done;
438 }
439
440 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
441 (seq - vblwait->request.sequence) <= (1<<23)) {
442 vblwait->request.sequence = seq + 1;
443 }
444
445 if (flags & _DRM_VBLANK_SIGNAL) {
446 /* There have never been any consumers */
447 ret = EINVAL;
448 } else {
449 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
450 vblwait->request.sequence, crtc);
451 for ( ret = 0 ; !ret && !(((drm_vblank_count(dev, crtc) -
452 vblwait->request.sequence) <= (1 << 23)) ||
453 !dev->irq_enabled) ; ) {
454 mtx_lock(&dev->irq_lock);
455 if (!(((drm_vblank_count(dev, crtc) -
456 vblwait->request.sequence) <= (1 << 23)) ||
457 !dev->irq_enabled))
458 ret = mtx_sleep(&dev->vblank[crtc].queue,
459 &dev->irq_lock, PCATCH, "vblwtq",
460 DRM_HZ);
461 mtx_unlock(&dev->irq_lock);
462 }
463
464 if (ret != EINTR && ret != ERESTART) {
465 struct timeval now;
466
467 microtime(&now);
468 vblwait->reply.tval_sec = now.tv_sec;
469 vblwait->reply.tval_usec = now.tv_usec;
470 vblwait->reply.sequence = drm_vblank_count(dev, crtc);
471 DRM_DEBUG("returning %d to client, irq_enabled %d\n",
472 vblwait->reply.sequence, dev->irq_enabled);
473 } else {
474 DRM_DEBUG("vblank wait interrupted by signal\n");
475 }
476 }
477
478 done:
479 DRM_SPINLOCK(&dev->vbl_lock);
480 drm_vblank_put(dev, crtc);
481 DRM_SPINUNLOCK(&dev->vbl_lock);
482
483 return ret;
484 }
485
drm_handle_vblank(struct drm_device * dev,int crtc)486 void drm_handle_vblank(struct drm_device *dev, int crtc)
487 {
488 atomic_add_rel_32(&dev->vblank[crtc].count, 1);
489 DRM_WAKEUP(&dev->vblank[crtc].queue);
490 }
491
492