aboutsummaryrefslogtreecommitdiff
path: root/bsd-core/drm_irq.c
blob: 2ca4275eb971abe3ca72572d985d5c5f91a2900e (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
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
/*-
 * Copyright 2003 Eric Anholt
 * All Rights Reserved.
 *
 * 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
 * ERIC ANHOLT 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.
 *
 * Authors:
 *    Eric Anholt <anholt@FreeBSD.org>
 *
 */

/** @file drm_irq.c
 * Support code for handling setup/teardown of interrupt handlers and
 * handing interrupt handlers off to the drivers.
 */

#include "drmP.h"
#include "drm.h"

int drm_irq_by_busid(struct drm_device *dev, void *data,
		     struct drm_file *file_priv)
{
	struct drm_irq_busid *irq = data;

	if ((irq->busnum >> 8) != dev->pci_domain ||
	    (irq->busnum & 0xff) != dev->pci_bus ||
	    irq->devnum != dev->pci_slot ||
	    irq->funcnum != dev->pci_func)
		return EINVAL;

	irq->irq = dev->irq;

	DRM_DEBUG("%d:%d:%d => IRQ %d\n",
	    irq->busnum, irq->devnum, irq->funcnum, irq->irq);

	return 0;
}

static irqreturn_t
drm_irq_handler_wrap(DRM_IRQ_ARGS)
{
	struct drm_device *dev = arg;

	DRM_SPINLOCK(&dev->irq_lock);
	dev->driver->irq_handler(arg);
	DRM_SPINUNLOCK(&dev->irq_lock);
}

static void vblank_disable_fn(void *arg)
{
	struct drm_device *dev = (struct drm_device *)arg;
	int i;

	if (callout_pending(&dev->vblank_disable_timer)) {
		/* callout was reset */
		return;
	}
	if (!callout_active(&dev->vblank_disable_timer)) {
		/* callout was stopped */
		return;
	}
	callout_deactivate(&dev->vblank_disable_timer);

	DRM_DEBUG("vblank_disable_allowed=%d\n", dev->vblank_disable_allowed);
	if (!dev->vblank_disable_allowed)
		return;

	for (i = 0; i < dev->num_crtcs; i++) {
		if (atomic_read(&dev->vblank[i].refcount) == 0 &&
		    dev->vblank[i].enabled) {
			DRM_DEBUG("disabling vblank on crtc %d\n", i);
			dev->vblank[i].last =
			    dev->driver->get_vblank_counter(dev, i);
			dev->driver->disable_vblank(dev, i);
			dev->vblank[i].enabled = 0;
		}
	}
}

void drm_vblank_cleanup(struct drm_device *dev)
{
	unsigned long irqflags;

	/* Bail if the driver didn't call drm_vblank_init() */
	if (dev->num_crtcs == 0)
		return;

	DRM_SPINLOCK_IRQSAVE(&dev->vbl_lock, irqflags);
	callout_stop(&dev->vblank_disable_timer);
	DRM_SPINUNLOCK_IRQRESTORE(&dev->vbl_lock, irqflags);

	callout_drain(&dev->vblank_disable_timer);

	vblank_disable_fn((void *)dev);

	free(dev->vblank, DRM_MEM_DRIVER);

	dev->num_crtcs = 0;
}

int drm_vblank_init(struct drm_device *dev, int num_crtcs)
{
	int i, ret = ENOMEM;

	callout_init_mtx(&dev->vblank_disable_timer, &dev->vbl_lock, 0);
	atomic_set(&dev->vbl_signal_pending, 0);
	dev->num_crtcs = num_crtcs;

	dev->vblank = malloc(sizeof(struct drm_vblank_info) * num_crtcs,
	    DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
	if (!dev->vblank)
	    goto err;

	DRM_DEBUG("\n");

	/* Zero per-crtc vblank stuff */
	for (i = 0; i < num_crtcs; i++) {
		DRM_INIT_WAITQUEUE(&dev->vblank[i].queue);
		TAILQ_INIT(&dev->vblank[i].sigs);
		atomic_set(&dev->vblank[i].count, 0);
		atomic_set(&dev->vblank[i].refcount, 0);
	}

	dev->vblank_disable_allowed = 0;

	return 0;

err:
	drm_vblank_cleanup(dev);
	return ret;
}

int drm_irq_install(struct drm_device *dev)
{
	int retcode;

	if (dev->irq == 0 || dev->dev_private == NULL)
		return EINVAL;

	DRM_DEBUG("irq=%d\n", dev->irq);

	DRM_LOCK();
	if (dev->irq_enabled) {
		DRM_UNLOCK();
		return EBUSY;
	}
	dev->irq_enabled = 1;

	dev->context_flag = 0;

	/* Before installing handler */
	dev->driver->irq_preinstall(dev);
	DRM_UNLOCK();

	/* Install handler */
#if __FreeBSD_version >= 700031
	retcode = bus_setup_intr(dev->device, dev->irqr,
				 INTR_TYPE_TTY | INTR_MPSAFE,
				 NULL, drm_irq_handler_wrap, dev, &dev->irqh);
#else
	retcode = bus_setup_intr(dev->device, dev->irqr,
				 INTR_TYPE_TTY | INTR_MPSAFE,
				 drm_irq_handler_wrap, dev, &dev->irqh);
#endif
	if (retcode != 0)
		goto err;

	/* After installing handler */
	DRM_LOCK();
	dev->driver->irq_postinstall(dev);
	DRM_UNLOCK();

	return 0;
err:
	DRM_LOCK();
	dev->irq_enabled = 0;
	DRM_UNLOCK();

	return retcode;
}

int drm_irq_uninstall(struct drm_device *dev)
{
	if (!dev->irq_enabled)
		return EINVAL;

	dev->irq_enabled = 0;

	DRM_DEBUG("irq=%d\n", dev->irq);

	dev->driver->irq_uninstall(dev);

	DRM_UNLOCK();
	bus_teardown_intr(dev->device, dev->irqr, dev->irqh);
	DRM_LOCK();

	return 0;
}

int drm_control(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
	struct drm_control *ctl = data;
	int err;

	switch (ctl->func) {
	case DRM_INST_HANDLER:
		/* Handle drivers whose DRM used to require IRQ setup but the
		 * no longer does.
		 */
		if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
			return 0;
		if (dev->if_version < DRM_IF_VERSION(1, 2) &&
		    ctl->irq != dev->irq)
			return EINVAL;
		return drm_irq_install(dev);
	case DRM_UNINST_HANDLER:
		if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
			return 0;
		DRM_LOCK();
		err = drm_irq_uninstall(dev);
		DRM_UNLOCK();
		return err;
	default:
		return EINVAL;
	}
}

u32 drm_vblank_count(struct drm_device *dev, int crtc)
{
	return atomic_read(&dev->vblank[crtc].count);
}

static void drm_update_vblank_count(struct drm_device *dev, int crtc)
{
	u32 cur_vblank, diff;

	/*
	 * Interrupts were disabled prior to this call, so deal with counter
	 * wrap if needed.
	 * NOTE!  It's possible we lost a full dev->max_vblank_count events
	 * here if the register is small or we had vblank interrupts off for
	 * a long time.
	 */
	cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
	diff = cur_vblank - dev->vblank[crtc].last;
	if (cur_vblank < dev->vblank[crtc].last) {
		diff += dev->max_vblank_count;

		DRM_DEBUG("vblank[%d].last=0x%x, cur_vblank=0x%x => diff=0x%x\n",
		    crtc, dev->vblank[crtc].last, cur_vblank, diff);
	}

	DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
	    crtc, diff);

	atomic_add(diff, &dev->vblank[crtc].count);
}

int drm_vblank_get(struct drm_device *dev, int crtc)
{
	unsigned long irqflags;
	int ret = 0;

	DRM_SPINLOCK_IRQSAVE(&dev->vbl_lock, irqflags);
	/* Going from 0->1 means we have to enable interrupts again */
	atomic_add_acq_int(&dev->vblank[crtc].refcount, 1);
	DRM_DEBUG("vblank refcount = %d\n", dev->vblank[crtc].refcount);
	if (dev->vblank[crtc].refcount == 1 &&
	    !dev->vblank[crtc].enabled) {
		ret = dev->driver->enable_vblank(dev, crtc);
		if (ret)
			atomic_dec(&dev->vblank[crtc].refcount);
		else {
			dev->vblank[crtc].enabled = 1;
			drm_update_vblank_count(dev, crtc);
		}
	}
	DRM_SPINUNLOCK_IRQRESTORE(&dev->vbl_lock, irqflags);

	return ret;
}

void drm_vblank_put(struct drm_device *dev, int crtc)
{
	unsigned long irqflags;

	DRM_SPINLOCK_IRQSAVE(&dev->vbl_lock, irqflags);
	/* Last user schedules interrupt disable */
	atomic_subtract_acq_int(&dev->vblank[crtc].refcount, 1);
	DRM_DEBUG("vblank refcount = %d\n", dev->vblank[crtc].refcount);
	if (dev->vblank[crtc].refcount == 0)
	    callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ,
		(timeout_t *)vblank_disable_fn, (void *)dev);
	DRM_SPINUNLOCK_IRQRESTORE(&dev->vbl_lock, irqflags);
}

int drm_modeset_ctl(struct drm_device *dev, void *data,
		    struct drm_file *file_priv)
{
	struct drm_modeset_ctl *modeset = data;
	unsigned long irqflags;
	int crtc, ret = 0;

	DRM_DEBUG("num_crtcs=%d\n", dev->num_crtcs);
	/* If drm_vblank_init() hasn't been called yet, just no-op */
	if (!dev->num_crtcs)
		goto out;

	crtc = modeset->crtc;
	DRM_DEBUG("crtc=%d\n", crtc);
	if (crtc >= dev->num_crtcs) {
		ret = EINVAL;
		goto out;
	}

	/*
	 * To avoid all the problems that might happen if interrupts
	 * were enabled/disabled around or between these calls, we just
	 * have the kernel take a reference on the CRTC (just once though
	 * to avoid corrupting the count if multiple, mismatch calls occur),
	 * so that interrupts remain enabled in the interim.
	 */
	switch (modeset->cmd) {
	case _DRM_PRE_MODESET:
		DRM_DEBUG("pre-modeset\n");
		if (!dev->vblank[crtc].inmodeset) {
			dev->vblank[crtc].inmodeset = 1;
			drm_vblank_get(dev, crtc);
		}
		break;
	case _DRM_POST_MODESET:
		DRM_DEBUG("post-modeset\n");
		if (dev->vblank[crtc].inmodeset) {
			DRM_SPINLOCK_IRQSAVE(&dev->vbl_lock, irqflags);
			dev->vblank_disable_allowed = 1;
			dev->vblank[crtc].inmodeset = 0;
			DRM_SPINUNLOCK_IRQRESTORE(&dev->vbl_lock, irqflags);
			drm_vblank_put(dev, crtc);
		}
		break;
	default:
		ret = EINVAL;
		break;
	}

out:
	return ret;
}

int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
	union drm_wait_vblank *vblwait = data;
	unsigned int flags, seq, crtc;
	int ret = 0;

	if (!dev->irq_enabled)
		return EINVAL;

	if (vblwait->request.type &
	    ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
		DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
		    vblwait->request.type,
		    (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
		return EINVAL;
	}

	flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
	crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;

	if (crtc >= dev->num_crtcs)
		return EINVAL;

	ret = drm_vblank_get(dev, crtc);
	if (ret) {
		DRM_ERROR("failed to acquire vblank counter, %d\n", ret);
		return ret;
	}
	seq = drm_vblank_count(dev, crtc);

	switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
	case _DRM_VBLANK_RELATIVE:
		vblwait->request.sequence += seq;
		vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
	case _DRM_VBLANK_ABSOLUTE:
		break;
	default:
		ret = EINVAL;
		goto done;
	}

	if ((flags & _DRM_VBLANK_NEXTONMISS) &&
	    (seq - vblwait->request.sequence) <= (1<<23)) {
		vblwait->request.sequence = seq + 1;
	}

	if (flags & _DRM_VBLANK_SIGNAL) {
#if 0 /* disabled */
		drm_vbl_sig_t *vbl_sig = malloc(sizeof(drm_vbl_sig_t),
		    DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
		if (vbl_sig == NULL)
			return ENOMEM;

		vbl_sig->sequence = vblwait->request.sequence;
		vbl_sig->signo = vblwait->request.signal;
		vbl_sig->pid = DRM_CURRENTPID;

		vblwait->reply.sequence = atomic_read(&dev->vbl_received);
		
		DRM_SPINLOCK(&dev->vbl_lock);
		TAILQ_INSERT_HEAD(&dev->vbl_sig_list, vbl_sig, link);
		DRM_SPINUNLOCK(&dev->vbl_lock);
		ret = 0;
#endif
		ret = EINVAL;
	} else {
		DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
		    vblwait->request.sequence, crtc);
		for ( ret = 0 ; !ret && !((drm_vblank_count(dev, crtc) -
		    vblwait->request.sequence) <= (1 << 23)) ; ) {
			mtx_lock(&dev->irq_lock);
			if (!((drm_vblank_count(dev, crtc) -
			    vblwait->request.sequence) <= (1 << 23)))
				ret = mtx_sleep(&dev->vblank[crtc].queue,
				    &dev->irq_lock, PCATCH, "vblwtq",
				    3 * DRM_HZ);
			mtx_unlock(&dev->irq_lock);
		}

		DRM_DEBUG("return = %d\n", ret);
		if (ret != EINTR) {
			struct timeval now;

			microtime(&now);
			vblwait->reply.tval_sec = now.tv_sec;
			vblwait->reply.tval_usec = now.tv_usec;
			vblwait->reply.sequence = drm_vblank_count(dev, crtc);
			DRM_DEBUG("returning %d to client\n",
			    vblwait->reply.sequence);
		} else {
			DRM_DEBUG("vblank wait interrupted by signal\n");
		}
	}

done:
	drm_vblank_put(dev, crtc);
	return ret;
}

void drm_vbl_send_signals(struct drm_device *dev, int crtc)
{
}

#if 0 /* disabled */
void drm_vbl_send_signals(struct drm_device *dev, int crtc )
{
	drm_vbl_sig_t *vbl_sig;
	unsigned int vbl_seq = atomic_read( &dev->vbl_received );
	struct proc *p;

	vbl_sig = TAILQ_FIRST(&dev->vbl_sig_list);
	while (vbl_sig != NULL) {
		drm_vbl_sig_t *next = TAILQ_NEXT(vbl_sig, link);

		if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
			p = pfind(vbl_sig->pid);
			if (p != NULL)
				psignal(p, vbl_sig->signo);

			TAILQ_REMOVE(&dev->vbl_sig_list, vbl_sig, link);
			DRM_FREE(vbl_sig,sizeof(*vbl_sig));
		}
		vbl_sig = next;
	}
}
#endif

void drm_handle_vblank(struct drm_device *dev, int crtc)
{
	atomic_inc(&dev->vblank[crtc].count);
	DRM_WAKEUP(&dev->vblank[crtc].queue);
	drm_vbl_send_signals(dev, crtc);
}