drm/bsd-core/drm_irq.c

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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>
*
*/
/** @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"
static void drm_locked_task(void *context, int pending __unused);
int drm_irq_by_busid(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_irq_busid_t *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;
}
#if defined(__FreeBSD__) && __FreeBSD_version >= 500000
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);
}
#endif
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);
for (i = 0; i < dev->num_crtcs; i++) {
if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
dev->vblank_enabled[i]) {
dev->driver.disable_vblank(dev, i);
dev->vblank_enabled[i] = 0;
}
}
}
static 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);
drm_free(dev->vbl_queue, sizeof(*dev->vbl_queue) * dev->num_crtcs,
DRM_MEM_DRIVER);
drm_free(dev->vbl_sigs, sizeof(*dev->vbl_sigs) * dev->num_crtcs,
DRM_MEM_DRIVER);
drm_free(dev->_vblank_count, sizeof(*dev->_vblank_count) *
dev->num_crtcs, DRM_MEM_DRIVER);
drm_free(dev->vblank_refcount, sizeof(*dev->vblank_refcount) *
dev->num_crtcs, DRM_MEM_DRIVER);
drm_free(dev->vblank_enabled, sizeof(*dev->vblank_enabled) *
dev->num_crtcs, DRM_MEM_DRIVER);
drm_free(dev->last_vblank, sizeof(*dev->last_vblank) * dev->num_crtcs,
DRM_MEM_DRIVER);
drm_free(dev->vblank_premodeset, sizeof(*dev->vblank_premodeset) *
dev->num_crtcs, DRM_MEM_DRIVER);
drm_free(dev->vblank_suspend, sizeof(*dev->vblank_suspend) *
dev->num_crtcs, 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->vbl_queue = drm_alloc(sizeof(wait_queue_head_t) * num_crtcs,
DRM_MEM_DRIVER);
if (!dev->vbl_queue)
goto err;
dev->vbl_sigs = drm_alloc(sizeof(struct drm_vbl_sig) * num_crtcs,
DRM_MEM_DRIVER);
if (!dev->vbl_sigs)
goto err;
dev->_vblank_count = drm_alloc(sizeof(atomic_t) * num_crtcs,
DRM_MEM_DRIVER);
if (!dev->_vblank_count)
goto err;
dev->vblank_refcount = drm_alloc(sizeof(atomic_t) * num_crtcs,
DRM_MEM_DRIVER);
if (!dev->vblank_refcount)
goto err;
dev->vblank_enabled = drm_calloc(num_crtcs, sizeof(int),
DRM_MEM_DRIVER);
if (!dev->vblank_enabled)
goto err;
dev->last_vblank = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER);
if (!dev->last_vblank)
goto err;
dev->vblank_premodeset = drm_calloc(num_crtcs, sizeof(u32),
DRM_MEM_DRIVER);
if (!dev->vblank_premodeset)
goto err;
dev->vblank_suspend = drm_calloc(num_crtcs, sizeof(int),
DRM_MEM_DRIVER);
if (!dev->vblank_suspend)
goto err;
/* Zero per-crtc vblank stuff */
for (i = 0; i < num_crtcs; i++) {
DRM_INIT_WAITQUEUE(&dev->vbl_queue[i]);
TAILQ_INIT(&dev->vbl_sigs[i]);
atomic_set(&dev->_vblank_count[i], 0);
atomic_set(&dev->vblank_refcount[i], 0);
}
return 0;
err:
drm_vblank_cleanup(dev);
return ret;
}
int drm_irq_install(struct drm_device *dev)
{
int retcode;
#ifdef __NetBSD__
pci_intr_handle_t ih;
#endif
if (dev->irq == 0 || dev->dev_private == NULL)
return EINVAL;
DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, 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 */
#ifdef __FreeBSD__
dev->irqrid = 0;
dev->irqr = bus_alloc_resource_any(dev->device, SYS_RES_IRQ,
&dev->irqrid, RF_SHAREABLE);
if (!dev->irqr) {
retcode = ENOENT;
goto err;
}
#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;
#elif defined(__NetBSD__) || defined(__OpenBSD__)
if (pci_intr_map(&dev->pa, &ih) != 0) {
retcode = ENOENT;
goto err;
}
dev->irqh = pci_intr_establish(&dev->pa.pa_pc, ih, IPL_TTY,
(irqreturn_t (*)(void *))dev->irq_handler, dev);
if (!dev->irqh) {
retcode = ENOENT;
goto err;
}
#endif
/* After installing handler */
DRM_LOCK();
dev->driver.irq_postinstall(dev);
DRM_UNLOCK();
TASK_INIT(&dev->locked_task, 0, drm_locked_task, dev);
return 0;
err:
DRM_LOCK();
dev->irq_enabled = 0;
#ifdef ___FreeBSD__
if (dev->irqrid != 0) {
bus_release_resource(dev->device, SYS_RES_IRQ, dev->irqrid,
dev->irqr);
dev->irqrid = 0;
}
#endif
DRM_UNLOCK();
return retcode;
}
int drm_irq_uninstall(struct drm_device *dev)
{
#ifdef __FreeBSD__
int irqrid;
#endif
if (!dev->irq_enabled)
return EINVAL;
dev->irq_enabled = 0;
#ifdef __FreeBSD__
irqrid = dev->irqrid;
dev->irqrid = 0;
#endif
DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq );
dev->driver.irq_uninstall(dev);
#ifdef __FreeBSD__
DRM_UNLOCK();
bus_teardown_intr(dev->device, dev->irqr, dev->irqh);
bus_release_resource(dev->device, SYS_RES_IRQ, irqrid, dev->irqr);
DRM_LOCK();
#elif defined(__NetBSD__) || defined(__OpenBSD__)
pci_intr_disestablish(&dev->pa.pa_pc, dev->irqh);
#endif
drm_vblank_cleanup(dev);
return 0;
}
int drm_control(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_control_t *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 (!dev->driver.use_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 (!dev->driver.use_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_count[crtc]);
}
void drm_update_vblank_count(struct drm_device *dev, int crtc)
{
unsigned long irqflags;
u32 cur_vblank, diff;
if (dev->vblank_suspend[crtc])
return;
/*
* 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);
DRM_SPINLOCK_IRQSAVE(&dev->vbl_lock, irqflags);
if (cur_vblank < dev->last_vblank[crtc]) {
if (cur_vblank == dev->last_vblank[crtc] - 1) {
diff = 0;
} else {
diff = dev->max_vblank_count -
dev->last_vblank[crtc];
diff += cur_vblank;
}
DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
crtc, dev->last_vblank[crtc], cur_vblank, diff);
} else {
diff = cur_vblank - dev->last_vblank[crtc];
}
dev->last_vblank[crtc] = cur_vblank;
DRM_SPINUNLOCK_IRQRESTORE(&dev->vbl_lock, irqflags);
atomic_add(diff, &dev->_vblank_count[crtc]);
}
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_refcount[crtc], 1);
if (dev->vblank_refcount[crtc] == 1 &&
!dev->vblank_enabled[crtc]) {
ret = dev->driver.enable_vblank(dev, crtc);
if (ret)
atomic_dec(&dev->vblank_refcount[crtc]);
else
dev->vblank_enabled[crtc] = 1;
}
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_refcount[crtc], 1);
if (dev->vblank_refcount[crtc] == 0)
callout_reset(&dev->vblank_disable_timer, jiffies + 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;
int crtc, ret = 0;
crtc = modeset->crtc;
if (crtc >= dev->num_crtcs) {
ret = EINVAL;
goto out;
}
switch (modeset->cmd) {
case _DRM_PRE_MODESET:
dev->vblank_premodeset[crtc] =
dev->driver.get_vblank_counter(dev, crtc);
dev->vblank_suspend[crtc] = 1;
break;
case _DRM_POST_MODESET:
if (dev->vblank_suspend[crtc]) {
u32 new = dev->driver.get_vblank_counter(dev, crtc);
/* Compensate for spurious wraparound */
if (new < dev->vblank_premodeset[crtc]) {
atomic_sub(dev->max_vblank_count + new -
dev->vblank_premodeset[crtc],
&dev->_vblank_count[crtc]);
DRM_DEBUG("vblank_premodeset[%d]=0x%x, new=0x%x"
" => _vblank_count[%d]-=0x%x\n", crtc,
dev->vblank_premodeset[crtc], new,
crtc, dev->max_vblank_count + new -
dev->vblank_premodeset[crtc]);
}
}
dev->vblank_suspend[crtc] = 0;
break;
default:
ret = EINVAL;
break;
}
out:
return ret;
}
int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_wait_vblank_t *vblwait = data;
int ret = 0;
int flags, seq, crtc;
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_update_vblank_count(dev, crtc);
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:
return EINVAL;
}
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), M_DRM,
M_NOWAIT | M_ZERO);
if (vbl_sig == NULL)
return ENOMEM;
if (dev->vblank_suspend[crtc])
return EBUSY;
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 {
if (!dev->vblank_suspend[crtc]) {
DRM_LOCK();
/* shared code returns -errno */
ret = drm_vblank_get(dev, crtc);
if (ret)
return ret;
DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
((drm_vblank_count(dev, crtc)
- vblwait->request.sequence) <= (1 << 23)));
drm_vblank_put(dev, crtc);
DRM_UNLOCK();
}
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);
}
}
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)
{
drm_update_vblank_count(dev, crtc);
DRM_WAKEUP(&dev->vbl_queue[crtc]);
drm_vbl_send_signals(dev, crtc);
}
static void drm_locked_task(void *context, int pending __unused)
{
struct drm_device *dev = context;
DRM_SPINLOCK(&dev->tsk_lock);
DRM_LOCK(); /* XXX drm_lock_take() should do it's own locking */
if (dev->locked_task_call == NULL ||
drm_lock_take(&dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT) == 0) {
DRM_UNLOCK();
DRM_SPINUNLOCK(&dev->tsk_lock);
return;
}
dev->lock.file_priv = NULL; /* kernel owned */
dev->lock.lock_time = jiffies;
atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
DRM_UNLOCK();
dev->locked_task_call(dev);
drm_lock_free(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
dev->locked_task_call = NULL;
DRM_SPINUNLOCK(&dev->tsk_lock);
}
void
drm_locked_tasklet(struct drm_device *dev,
void (*tasklet)(struct drm_device *dev))
{
DRM_SPINLOCK(&dev->tsk_lock);
if (dev->locked_task_call != NULL) {
DRM_SPINUNLOCK(&dev->tsk_lock);
return;
}
dev->locked_task_call = tasklet;
DRM_SPINUNLOCK(&dev->tsk_lock);
taskqueue_enqueue(taskqueue_swi, &dev->locked_task);
}