2 * Copyright 2003 Eric Anholt
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:
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
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.
24 * Eric Anholt <anholt@FreeBSD.org>
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
32 * Support code for handling setup/teardown of interrupt handlers and
33 * handing interrupt handlers off to the drivers.
36 #include "dev/drm/drmP.h"
37 #include "dev/drm/drm.h"
39 int drm_irq_by_busid(struct drm_device *dev, void *data,
40 struct drm_file *file_priv)
42 struct drm_irq_busid *irq = data;
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)
52 DRM_DEBUG("%d:%d:%d => IRQ %d\n",
53 irq->busnum, irq->devnum, irq->funcnum, irq->irq);
59 drm_irq_handler_wrap(DRM_IRQ_ARGS)
61 struct drm_device *dev = arg;
63 DRM_SPINLOCK(&dev->irq_lock);
64 dev->driver->irq_handler(arg);
65 DRM_SPINUNLOCK(&dev->irq_lock);
68 static void vblank_disable_fn(void *arg)
70 struct drm_device *dev = (struct drm_device *)arg;
73 /* Make sure that we are called with the lock held */
74 mtx_assert(&dev->vbl_lock, MA_OWNED);
76 if (callout_pending(&dev->vblank_disable_timer)) {
77 /* callout was reset */
80 if (!callout_active(&dev->vblank_disable_timer)) {
81 /* callout was stopped */
84 callout_deactivate(&dev->vblank_disable_timer);
86 DRM_DEBUG("vblank_disable: %s\n", dev->vblank_disable_allowed ?
87 "allowed" : "denied");
88 if (!dev->vblank_disable_allowed)
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);
96 dev->driver->get_vblank_counter(dev, i);
97 dev->driver->disable_vblank(dev, i);
98 dev->vblank[i].enabled = 0;
103 void drm_vblank_cleanup(struct drm_device *dev)
105 /* Bail if the driver didn't call drm_vblank_init() */
106 if (dev->num_crtcs == 0)
109 DRM_SPINLOCK(&dev->vbl_lock);
110 callout_stop(&dev->vblank_disable_timer);
111 DRM_SPINUNLOCK(&dev->vbl_lock);
113 callout_drain(&dev->vblank_disable_timer);
115 DRM_SPINLOCK(&dev->vbl_lock);
116 vblank_disable_fn((void *)dev);
117 DRM_SPINUNLOCK(&dev->vbl_lock);
119 free(dev->vblank, DRM_MEM_DRIVER);
124 int drm_vblank_init(struct drm_device *dev, int num_crtcs)
128 callout_init_mtx(&dev->vblank_disable_timer, &dev->vbl_lock, 0);
129 dev->num_crtcs = num_crtcs;
131 dev->vblank = malloc(sizeof(struct drm_vblank_info) * num_crtcs,
132 DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
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);
145 dev->vblank_disable_allowed = 0;
146 DRM_SPINUNLOCK(&dev->vbl_lock);
151 drm_vblank_cleanup(dev);
155 int drm_irq_install(struct drm_device *dev)
159 if (dev->irq == 0 || dev->dev_private == NULL)
162 DRM_DEBUG("irq=%d\n", dev->irq);
165 if (dev->irq_enabled) {
169 dev->irq_enabled = 1;
171 dev->context_flag = 0;
173 /* Before installing handler */
174 dev->driver->irq_preinstall(dev);
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);
184 /* After installing handler */
186 dev->driver->irq_postinstall(dev);
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;
195 callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ,
196 (timeout_t *)vblank_disable_fn, (void *)dev);
197 DRM_SPINUNLOCK(&dev->vbl_lock);
203 dev->irq_enabled = 0;
209 int drm_irq_uninstall(struct drm_device *dev)
213 if (!dev->irq_enabled)
216 dev->irq_enabled = 0;
219 * Wake up any waiters so they don't hang.
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;
230 DRM_SPINUNLOCK(&dev->vbl_lock);
232 DRM_DEBUG("irq=%d\n", dev->irq);
234 dev->driver->irq_uninstall(dev);
237 bus_teardown_intr(dev->device, dev->irqr, dev->irqh);
243 int drm_control(struct drm_device *dev, void *data, struct drm_file *file_priv)
245 struct drm_control *ctl = data;
249 case DRM_INST_HANDLER:
250 /* Handle drivers whose DRM used to require IRQ setup but the
253 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
255 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
256 ctl->irq != dev->irq)
258 return drm_irq_install(dev);
259 case DRM_UNINST_HANDLER:
260 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
263 err = drm_irq_uninstall(dev);
271 u32 drm_vblank_count(struct drm_device *dev, int crtc)
273 return atomic_load_acq_32(&dev->vblank[crtc].count);
276 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
278 u32 cur_vblank, diff;
281 * Interrupts were disabled prior to this call, so deal with counter
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
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;
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);
296 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
299 atomic_add_rel_32(&dev->vblank[crtc].count, diff);
302 int drm_vblank_get(struct drm_device *dev, int crtc)
306 /* Make sure that we are called with the lock held */
307 mtx_assert(&dev->vbl_lock, MA_OWNED);
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);
315 --dev->vblank[crtc].refcount;
317 dev->vblank[crtc].enabled = 1;
318 drm_update_vblank_count(dev, crtc);
322 if (dev->vblank[crtc].enabled)
323 dev->vblank[crtc].last =
324 dev->driver->get_vblank_counter(dev, crtc);
329 void drm_vblank_put(struct drm_device *dev, int crtc)
331 /* Make sure that we are called with the lock held */
332 mtx_assert(&dev->vbl_lock, MA_OWNED);
334 KASSERT(dev->vblank[crtc].refcount > 0,
335 ("invalid refcount"));
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);
343 int drm_modeset_ctl(struct drm_device *dev, void *data,
344 struct drm_file *file_priv)
346 struct drm_modeset_ctl *modeset = data;
349 /* If drm_vblank_init() hasn't been called yet, just no-op */
353 crtc = modeset->crtc;
354 if (crtc >= dev->num_crtcs) {
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.
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;
375 DRM_SPINUNLOCK(&dev->vbl_lock);
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;
385 dev->vblank_disable_allowed = 1;
386 DRM_SPINUNLOCK(&dev->vbl_lock);
397 int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv)
399 union drm_wait_vblank *vblwait = data;
400 unsigned int flags, seq, crtc;
403 if (!dev->irq_enabled)
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));
414 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
415 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
417 if (crtc >= dev->num_crtcs)
420 DRM_SPINLOCK(&dev->vbl_lock);
421 ret = drm_vblank_get(dev, crtc);
422 DRM_SPINUNLOCK(&dev->vbl_lock);
424 DRM_ERROR("failed to acquire vblank counter, %d\n", ret);
427 seq = drm_vblank_count(dev, crtc);
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:
440 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
441 (seq - vblwait->request.sequence) <= (1<<23)) {
442 vblwait->request.sequence = seq + 1;
445 if (flags & _DRM_VBLANK_SIGNAL) {
446 /* There have never been any consumers */
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)) ||
458 ret = mtx_sleep(&dev->vblank[crtc].queue,
459 &dev->irq_lock, PCATCH, "vblwtq",
461 mtx_unlock(&dev->irq_lock);
464 if (ret != EINTR && ret != ERESTART) {
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);
474 DRM_DEBUG("vblank wait interrupted by signal\n");
479 DRM_SPINLOCK(&dev->vbl_lock);
480 drm_vblank_put(dev, crtc);
481 DRM_SPINUNLOCK(&dev->vbl_lock);
486 void drm_handle_vblank(struct drm_device *dev, int crtc)
488 atomic_add_rel_32(&dev->vblank[crtc].count, 1);
489 DRM_WAKEUP(&dev->vblank[crtc].queue);