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/*-
* 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>
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/drm/drm_irq.c 216374 2010-12-11 10:18:05Z avg $");
/** @file drm_irq.c
* Support code for handling setup/teardown of interrupt handlers and
* handing interrupt handlers off to the drivers.
*/
#include "dev/drm/drmP.h"
#include "dev/drm/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;
/* Make sure that we are called with the lock held */
mtx_assert(&dev->vbl_lock, MA_OWNED);
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: %s\n", dev->vblank_disable_allowed ?
"allowed" : "denied");
if (!dev->vblank_disable_allowed)
return;
for (i = 0; i < dev->num_crtcs; i++) {
if (dev->vblank[i].refcount == 0 &&
dev->vblank[i].enabled && !dev->vblank[i].inmodeset) {
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)
{
/* Bail if the driver didn't call drm_vblank_init() */
if (dev->num_crtcs == 0)
return;
DRM_SPINLOCK(&dev->vbl_lock);
callout_stop(&dev->vblank_disable_timer);
DRM_SPINUNLOCK(&dev->vbl_lock);
callout_drain(&dev->vblank_disable_timer);
DRM_SPINLOCK(&dev->vbl_lock);
vblank_disable_fn((void *)dev);
DRM_SPINUNLOCK(&dev->vbl_lock);
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);
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 */
DRM_SPINLOCK(&dev->vbl_lock);
for (i = 0; i < num_crtcs; i++) {
DRM_INIT_WAITQUEUE(&dev->vblank[i].queue);
dev->vblank[i].refcount = 0;
atomic_store_rel_32(&dev->vblank[i].count, 0);
}
dev->vblank_disable_allowed = 0;
DRM_SPINUNLOCK(&dev->vbl_lock);
return 0;
err:
drm_vblank_cleanup(dev);
return ret;
}
int drm_irq_install(struct drm_device *dev)
{
int crtc, 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();
if (dev->driver->enable_vblank) {
DRM_SPINLOCK(&dev->vbl_lock);
for( crtc = 0 ; crtc < dev->num_crtcs ; crtc++) {
if (dev->driver->enable_vblank(dev, crtc) == 0) {
dev->vblank[crtc].enabled = 1;
}
}
callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ,
(timeout_t *)vblank_disable_fn, (void *)dev);
DRM_SPINUNLOCK(&dev->vbl_lock);
}
return 0;
err:
DRM_LOCK();
dev->irq_enabled = 0;
DRM_UNLOCK();
return retcode;
}
int drm_irq_uninstall(struct drm_device *dev)
{
int crtc;
if (!dev->irq_enabled)
return EINVAL;
dev->irq_enabled = 0;
/*
* Wake up any waiters so they don't hang.
*/
DRM_SPINLOCK(&dev->vbl_lock);
for (crtc = 0; crtc < dev->num_crtcs; crtc++) {
if (dev->vblank[crtc].enabled) {
DRM_WAKEUP(&dev->vblank[crtc].queue);
dev->vblank[crtc].last =
dev->driver->get_vblank_counter(dev, crtc);
dev->vblank[crtc].enabled = 0;
}
}
DRM_SPINUNLOCK(&dev->vbl_lock);
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_load_acq_32(&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_rel_32(&dev->vblank[crtc].count, diff);
}
int drm_vblank_get(struct drm_device *dev, int crtc)
{
int ret = 0;
/* Make sure that we are called with the lock held */
mtx_assert(&dev->vbl_lock, MA_OWNED);
/* Going from 0->1 means we have to enable interrupts again */
if (++dev->vblank[crtc].refcount == 1 &&
!dev->vblank[crtc].enabled) {
ret = dev->driver->enable_vblank(dev, crtc);
DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
if (ret)
--dev->vblank[crtc].refcount;
else {
dev->vblank[crtc].enabled = 1;
drm_update_vblank_count(dev, crtc);
}
}
if (dev->vblank[crtc].enabled)
dev->vblank[crtc].last =
dev->driver->get_vblank_counter(dev, crtc);
return ret;
}
void drm_vblank_put(struct drm_device *dev, int crtc)
{
/* Make sure that we are called with the lock held */
mtx_assert(&dev->vbl_lock, MA_OWNED);
KASSERT(dev->vblank[crtc].refcount > 0,
("invalid refcount"));
/* Last user schedules interrupt disable */
if (--dev->vblank[crtc].refcount == 0)
callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ,
(timeout_t *)vblank_disable_fn, (void *)dev);
}
int drm_modeset_ctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_modeset_ctl *modeset = data;
int crtc, ret = 0;
/* If drm_vblank_init() hasn't been called yet, just no-op */
if (!dev->num_crtcs)
goto out;
crtc = modeset->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, crtc %d\n", crtc);
DRM_SPINLOCK(&dev->vbl_lock);
if (!dev->vblank[crtc].inmodeset) {
dev->vblank[crtc].inmodeset = 0x1;
if (drm_vblank_get(dev, crtc) == 0)
dev->vblank[crtc].inmodeset |= 0x2;
}
DRM_SPINUNLOCK(&dev->vbl_lock);
break;
case _DRM_POST_MODESET:
DRM_DEBUG("post-modeset, crtc %d\n", crtc);
DRM_SPINLOCK(&dev->vbl_lock);
if (dev->vblank[crtc].inmodeset) {
if (dev->vblank[crtc].inmodeset & 0x2)
drm_vblank_put(dev, crtc);
dev->vblank[crtc].inmodeset = 0;
}
dev->vblank_disable_allowed = 1;
DRM_SPINUNLOCK(&dev->vbl_lock);
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;
DRM_SPINLOCK(&dev->vbl_lock);
ret = drm_vblank_get(dev, crtc);
DRM_SPINUNLOCK(&dev->vbl_lock);
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) {
/* There have never been any consumers */
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)) ||
!dev->irq_enabled) ; ) {
mtx_lock(&dev->irq_lock);
if (!(((drm_vblank_count(dev, crtc) -
vblwait->request.sequence) <= (1 << 23)) ||
!dev->irq_enabled))
ret = mtx_sleep(&dev->vblank[crtc].queue,
&dev->irq_lock, PCATCH, "vblwtq",
DRM_HZ);
mtx_unlock(&dev->irq_lock);
}
if (ret != EINTR && ret != ERESTART) {
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, irq_enabled %d\n",
vblwait->reply.sequence, dev->irq_enabled);
} else {
DRM_DEBUG("vblank wait interrupted by signal\n");
}
}
done:
DRM_SPINLOCK(&dev->vbl_lock);
drm_vblank_put(dev, crtc);
DRM_SPINUNLOCK(&dev->vbl_lock);
return ret;
}
void drm_handle_vblank(struct drm_device *dev, int crtc)
{
atomic_add_rel_32(&dev->vblank[crtc].count, 1);
DRM_WAKEUP(&dev->vblank[crtc].queue);
}