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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [drm/] [drm_dma.h] - Blame information for rev 1765

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/* drm_dma.c -- DMA IOCTL and function support -*- linux-c -*-
 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * 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
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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:
 *    Rickard E. (Rik) Faith <faith@valinux.com>
 *    Gareth Hughes <gareth@valinux.com>
 */
 
#include "drmP.h"
#include "drm_os_linux.h"
#include <linux/interrupt.h>    /* For task queue support */
 
#ifndef __HAVE_DMA_WAITQUEUE
#define __HAVE_DMA_WAITQUEUE    0
#endif
#ifndef __HAVE_DMA_RECLAIM
#define __HAVE_DMA_RECLAIM      0
#endif
#ifndef __HAVE_SHARED_IRQ
#define __HAVE_SHARED_IRQ       0
#endif
 
#if __HAVE_SHARED_IRQ
#define DRM_IRQ_TYPE            SA_SHIRQ
#else
#define DRM_IRQ_TYPE            0
#endif
 
#if __HAVE_DMA
 
int DRM(dma_setup)( drm_device_t *dev )
{
        int i;
 
        dev->dma = DRM(alloc)( sizeof(*dev->dma), DRM_MEM_DRIVER );
        if ( !dev->dma )
                return -ENOMEM;
 
        memset( dev->dma, 0, sizeof(*dev->dma) );
 
        for ( i = 0 ; i <= DRM_MAX_ORDER ; i++ )
                memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
 
        return 0;
}
 
void DRM(dma_takedown)(drm_device_t *dev)
{
        drm_device_dma_t  *dma = dev->dma;
        int               i, j;
 
        if (!dma) return;
 
                                /* Clear dma buffers */
        for (i = 0; i <= DRM_MAX_ORDER; i++) {
                if (dma->bufs[i].seg_count) {
                        DRM_DEBUG("order %d: buf_count = %d,"
                                  " seg_count = %d\n",
                                  i,
                                  dma->bufs[i].buf_count,
                                  dma->bufs[i].seg_count);
                        for (j = 0; j < dma->bufs[i].seg_count; j++) {
                                DRM(free_pages)(dma->bufs[i].seglist[j],
                                                dma->bufs[i].page_order,
                                                DRM_MEM_DMA);
                        }
                        DRM(free)(dma->bufs[i].seglist,
                                  dma->bufs[i].seg_count
                                  * sizeof(*dma->bufs[0].seglist),
                                  DRM_MEM_SEGS);
                }
                if(dma->bufs[i].buf_count) {
                        for(j = 0; j < dma->bufs[i].buf_count; j++) {
                           if(dma->bufs[i].buflist[j].dev_private) {
                              DRM(free)(dma->bufs[i].buflist[j].dev_private,
                                        dma->bufs[i].buflist[j].dev_priv_size,
                                        DRM_MEM_BUFS);
                           }
                        }
                        DRM(free)(dma->bufs[i].buflist,
                                  dma->bufs[i].buf_count *
                                  sizeof(*dma->bufs[0].buflist),
                                  DRM_MEM_BUFS);
#if __HAVE_DMA_FREELIST
                        DRM(freelist_destroy)(&dma->bufs[i].freelist);
#endif
                }
        }
 
        if (dma->buflist) {
                DRM(free)(dma->buflist,
                          dma->buf_count * sizeof(*dma->buflist),
                          DRM_MEM_BUFS);
        }
 
        if (dma->pagelist) {
                DRM(free)(dma->pagelist,
                          dma->page_count * sizeof(*dma->pagelist),
                          DRM_MEM_PAGES);
        }
        DRM(free)(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
        dev->dma = NULL;
}
 
 
#if __HAVE_DMA_HISTOGRAM
/* This is slow, but is useful for debugging. */
int DRM(histogram_slot)(unsigned long count)
{
        int value = DRM_DMA_HISTOGRAM_INITIAL;
        int slot;
 
        for (slot = 0;
             slot < DRM_DMA_HISTOGRAM_SLOTS;
             ++slot, value = DRM_DMA_HISTOGRAM_NEXT(value)) {
                if (count < value) return slot;
        }
        return DRM_DMA_HISTOGRAM_SLOTS - 1;
}
 
void DRM(histogram_compute)(drm_device_t *dev, drm_buf_t *buf)
{
        cycles_t queued_to_dispatched;
        cycles_t dispatched_to_completed;
        cycles_t completed_to_freed;
        int      q2d, d2c, c2f, q2c, q2f;
 
        if (buf->time_queued) {
                queued_to_dispatched    = (buf->time_dispatched
                                           - buf->time_queued);
                dispatched_to_completed = (buf->time_completed
                                           - buf->time_dispatched);
                completed_to_freed      = (buf->time_freed
                                           - buf->time_completed);
 
                q2d = DRM(histogram_slot)(queued_to_dispatched);
                d2c = DRM(histogram_slot)(dispatched_to_completed);
                c2f = DRM(histogram_slot)(completed_to_freed);
 
                q2c = DRM(histogram_slot)(queued_to_dispatched
                                          + dispatched_to_completed);
                q2f = DRM(histogram_slot)(queued_to_dispatched
                                          + dispatched_to_completed
                                          + completed_to_freed);
 
                atomic_inc(&dev->histo.total);
                atomic_inc(&dev->histo.queued_to_dispatched[q2d]);
                atomic_inc(&dev->histo.dispatched_to_completed[d2c]);
                atomic_inc(&dev->histo.completed_to_freed[c2f]);
 
                atomic_inc(&dev->histo.queued_to_completed[q2c]);
                atomic_inc(&dev->histo.queued_to_freed[q2f]);
 
        }
        buf->time_queued     = 0;
        buf->time_dispatched = 0;
        buf->time_completed  = 0;
        buf->time_freed      = 0;
}
#endif
 
void DRM(free_buffer)(drm_device_t *dev, drm_buf_t *buf)
{
        if (!buf) return;
 
        buf->waiting  = 0;
        buf->pending  = 0;
        buf->pid      = 0;
        buf->used     = 0;
#if __HAVE_DMA_HISTOGRAM
        buf->time_completed = get_cycles();
#endif
 
        if ( __HAVE_DMA_WAITQUEUE && waitqueue_active(&buf->dma_wait)) {
                wake_up_interruptible(&buf->dma_wait);
        }
#if __HAVE_DMA_FREELIST
        else {
                drm_device_dma_t *dma = dev->dma;
                                /* If processes are waiting, the last one
                                   to wake will put the buffer on the free
                                   list.  If no processes are waiting, we
                                   put the buffer on the freelist here. */
                DRM(freelist_put)(dev, &dma->bufs[buf->order].freelist, buf);
        }
#endif
}
 
#if !__HAVE_DMA_RECLAIM
void DRM(reclaim_buffers)(drm_device_t *dev, pid_t pid)
{
        drm_device_dma_t *dma = dev->dma;
        int              i;
 
        if (!dma) return;
        for (i = 0; i < dma->buf_count; i++) {
                if (dma->buflist[i]->pid == pid) {
                        switch (dma->buflist[i]->list) {
                        case DRM_LIST_NONE:
                                DRM(free_buffer)(dev, dma->buflist[i]);
                                break;
                        case DRM_LIST_WAIT:
                                dma->buflist[i]->list = DRM_LIST_RECLAIM;
                                break;
                        default:
                                /* Buffer already on hardware. */
                                break;
                        }
                }
        }
}
#endif
 
 
/* GH: This is a big hack for now...
 */
#if __HAVE_OLD_DMA
 
void DRM(clear_next_buffer)(drm_device_t *dev)
{
        drm_device_dma_t *dma = dev->dma;
 
        dma->next_buffer = NULL;
        if (dma->next_queue && !DRM_BUFCOUNT(&dma->next_queue->waitlist)) {
                wake_up_interruptible(&dma->next_queue->flush_queue);
        }
        dma->next_queue  = NULL;
}
 
int DRM(select_queue)(drm_device_t *dev, void (*wrapper)(unsigned long))
{
        int        i;
        int        candidate = -1;
        int        j         = jiffies;
 
        if (!dev) {
                DRM_ERROR("No device\n");
                return -1;
        }
        if (!dev->queuelist || !dev->queuelist[DRM_KERNEL_CONTEXT]) {
                                /* This only happens between the time the
                                   interrupt is initialized and the time
                                   the queues are initialized. */
                return -1;
        }
 
                                /* Doing "while locked" DMA? */
        if (DRM_WAITCOUNT(dev, DRM_KERNEL_CONTEXT)) {
                return DRM_KERNEL_CONTEXT;
        }
 
                                /* If there are buffers on the last_context
                                   queue, and we have not been executing
                                   this context very long, continue to
                                   execute this context. */
        if (dev->last_switch <= j
            && dev->last_switch + DRM_TIME_SLICE > j
            && DRM_WAITCOUNT(dev, dev->last_context)) {
                return dev->last_context;
        }
 
                                /* Otherwise, find a candidate */
        for (i = dev->last_checked + 1; i < dev->queue_count; i++) {
                if (DRM_WAITCOUNT(dev, i)) {
                        candidate = dev->last_checked = i;
                        break;
                }
        }
 
        if (candidate < 0) {
                for (i = 0; i < dev->queue_count; i++) {
                        if (DRM_WAITCOUNT(dev, i)) {
                                candidate = dev->last_checked = i;
                                break;
                        }
                }
        }
 
        if (wrapper
            && candidate >= 0
            && candidate != dev->last_context
            && dev->last_switch <= j
            && dev->last_switch + DRM_TIME_SLICE > j) {
                if (dev->timer.expires != dev->last_switch + DRM_TIME_SLICE) {
                        del_timer(&dev->timer);
                        dev->timer.function = wrapper;
                        dev->timer.data     = (unsigned long)dev;
                        dev->timer.expires  = dev->last_switch+DRM_TIME_SLICE;
                        add_timer(&dev->timer);
                }
                return -1;
        }
 
        return candidate;
}
 
 
int DRM(dma_enqueue)(drm_device_t *dev, drm_dma_t *d)
{
        int               i;
        drm_queue_t       *q;
        drm_buf_t         *buf;
        int               idx;
        int               while_locked = 0;
        drm_device_dma_t  *dma = dev->dma;
        DECLARE_WAITQUEUE(entry, current);
 
        DRM_DEBUG("%d\n", d->send_count);
 
        if (d->flags & _DRM_DMA_WHILE_LOCKED) {
                int context = dev->lock.hw_lock->lock;
 
                if (!_DRM_LOCK_IS_HELD(context)) {
                        DRM_ERROR("No lock held during \"while locked\""
                                  " request\n");
                        return -EINVAL;
                }
                if (d->context != _DRM_LOCKING_CONTEXT(context)
                    && _DRM_LOCKING_CONTEXT(context) != DRM_KERNEL_CONTEXT) {
                        DRM_ERROR("Lock held by %d while %d makes"
                                  " \"while locked\" request\n",
                                  _DRM_LOCKING_CONTEXT(context),
                                  d->context);
                        return -EINVAL;
                }
                q = dev->queuelist[DRM_KERNEL_CONTEXT];
                while_locked = 1;
        } else {
                q = dev->queuelist[d->context];
        }
 
 
        atomic_inc(&q->use_count);
        if (atomic_read(&q->block_write)) {
                add_wait_queue(&q->write_queue, &entry);
                atomic_inc(&q->block_count);
                for (;;) {
                        current->state = TASK_INTERRUPTIBLE;
                        if (!atomic_read(&q->block_write)) break;
                        schedule();
                        if (signal_pending(current)) {
                                atomic_dec(&q->use_count);
                                remove_wait_queue(&q->write_queue, &entry);
                                return -EINTR;
                        }
                }
                atomic_dec(&q->block_count);
                current->state = TASK_RUNNING;
                remove_wait_queue(&q->write_queue, &entry);
        }
 
        for (i = 0; i < d->send_count; i++) {
                idx = d->send_indices[i];
                if (idx < 0 || idx >= dma->buf_count) {
                        atomic_dec(&q->use_count);
                        DRM_ERROR("Index %d (of %d max)\n",
                                  d->send_indices[i], dma->buf_count - 1);
                        return -EINVAL;
                }
                buf = dma->buflist[ idx ];
                if (buf->pid != current->pid) {
                        atomic_dec(&q->use_count);
                        DRM_ERROR("Process %d using buffer owned by %d\n",
                                  current->pid, buf->pid);
                        return -EINVAL;
                }
                if (buf->list != DRM_LIST_NONE) {
                        atomic_dec(&q->use_count);
                        DRM_ERROR("Process %d using buffer %d on list %d\n",
                                  current->pid, buf->idx, buf->list);
                }
                buf->used         = d->send_sizes[i];
                buf->while_locked = while_locked;
                buf->context      = d->context;
                if (!buf->used) {
                        DRM_ERROR("Queueing 0 length buffer\n");
                }
                if (buf->pending) {
                        atomic_dec(&q->use_count);
                        DRM_ERROR("Queueing pending buffer:"
                                  " buffer %d, offset %d\n",
                                  d->send_indices[i], i);
                        return -EINVAL;
                }
                if (buf->waiting) {
                        atomic_dec(&q->use_count);
                        DRM_ERROR("Queueing waiting buffer:"
                                  " buffer %d, offset %d\n",
                                  d->send_indices[i], i);
                        return -EINVAL;
                }
                buf->waiting = 1;
                if (atomic_read(&q->use_count) == 1
                    || atomic_read(&q->finalization)) {
                        DRM(free_buffer)(dev, buf);
                } else {
                        DRM(waitlist_put)(&q->waitlist, buf);
                        atomic_inc(&q->total_queued);
                }
        }
        atomic_dec(&q->use_count);
 
        return 0;
}
 
static int DRM(dma_get_buffers_of_order)(drm_device_t *dev, drm_dma_t *d,
                                         int order)
{
        int               i;
        drm_buf_t         *buf;
        drm_device_dma_t  *dma = dev->dma;
 
        for (i = d->granted_count; i < d->request_count; i++) {
                buf = DRM(freelist_get)(&dma->bufs[order].freelist,
                                        d->flags & _DRM_DMA_WAIT);
                if (!buf) break;
                if (buf->pending || buf->waiting) {
                        DRM_ERROR("Free buffer %d in use by %d (w%d, p%d)\n",
                                  buf->idx,
                                  buf->pid,
                                  buf->waiting,
                                  buf->pending);
                }
                buf->pid     = current->pid;
                if (copy_to_user(&d->request_indices[i],
                                 &buf->idx,
                                 sizeof(buf->idx)))
                        return -EFAULT;
 
                if (copy_to_user(&d->request_sizes[i],
                                 &buf->total,
                                 sizeof(buf->total)))
                        return -EFAULT;
 
                ++d->granted_count;
        }
        return 0;
}
 
 
int DRM(dma_get_buffers)(drm_device_t *dev, drm_dma_t *dma)
{
        int               order;
        int               retcode = 0;
        int               tmp_order;
 
        order = DRM(order)(dma->request_size);
 
        dma->granted_count = 0;
        retcode            = DRM(dma_get_buffers_of_order)(dev, dma, order);
 
        if (dma->granted_count < dma->request_count
            && (dma->flags & _DRM_DMA_SMALLER_OK)) {
                for (tmp_order = order - 1;
                     !retcode
                             && dma->granted_count < dma->request_count
                             && tmp_order >= DRM_MIN_ORDER;
                     --tmp_order) {
 
                        retcode = DRM(dma_get_buffers_of_order)(dev, dma,
                                                                tmp_order);
                }
        }
 
        if (dma->granted_count < dma->request_count
            && (dma->flags & _DRM_DMA_LARGER_OK)) {
                for (tmp_order = order + 1;
                     !retcode
                             && dma->granted_count < dma->request_count
                             && tmp_order <= DRM_MAX_ORDER;
                     ++tmp_order) {
 
                        retcode = DRM(dma_get_buffers_of_order)(dev, dma,
                                                                tmp_order);
                }
        }
        return 0;
}
 
#endif /* __HAVE_OLD_DMA */
 
 
#if __HAVE_DMA_IRQ
 
int DRM(irq_install)( drm_device_t *dev, int irq )
{
        int ret;
 
        if ( !irq )
                return -EINVAL;
 
        down( &dev->struct_sem );
        if ( dev->irq ) {
                up( &dev->struct_sem );
                return -EBUSY;
        }
        dev->irq = irq;
        up( &dev->struct_sem );
 
        DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
 
        dev->context_flag = 0;
        dev->interrupt_flag = 0;
        dev->dma_flag = 0;
 
        dev->dma->next_buffer = NULL;
        dev->dma->next_queue = NULL;
        dev->dma->this_buffer = NULL;
 
#if __HAVE_DMA_IRQ_BH
        INIT_LIST_HEAD( &dev->tq.list );
        dev->tq.sync = 0;
        dev->tq.routine = DRM(dma_immediate_bh);
        dev->tq.data = dev;
#endif
 
#if __HAVE_VBL_IRQ
        init_waitqueue_head(&dev->vbl_queue);
 
        spin_lock_init( &dev->vbl_lock );
 
        INIT_LIST_HEAD( &dev->vbl_sigs.head );
 
        dev->vbl_pending = 0;
#endif
 
                                /* Before installing handler */
        DRM(driver_irq_preinstall)(dev);
 
                                /* Install handler */
        ret = request_irq( dev->irq, DRM(dma_service),
                           DRM_IRQ_TYPE, dev->devname, dev );
        if ( ret < 0 ) {
                down( &dev->struct_sem );
                dev->irq = 0;
                up( &dev->struct_sem );
                return ret;
        }
 
                                /* After installing handler */
        DRM(driver_irq_postinstall)(dev);
 
        return 0;
}
 
int DRM(irq_uninstall)( drm_device_t *dev )
{
        int irq;
 
        down( &dev->struct_sem );
        irq = dev->irq;
        dev->irq = 0;
        up( &dev->struct_sem );
 
        if ( !irq )
                return -EINVAL;
 
        DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
 
        DRM(driver_irq_uninstall)( dev );
 
        free_irq( irq, dev );
 
        return 0;
}
 
int DRM(control)( struct inode *inode, struct file *filp,
                  unsigned int cmd, unsigned long arg )
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->dev;
        drm_control_t ctl;
 
        if ( copy_from_user( &ctl, (drm_control_t *)arg, sizeof(ctl) ) )
                return -EFAULT;
 
        switch ( ctl.func ) {
        case DRM_INST_HANDLER:
                return DRM(irq_install)( dev, ctl.irq );
        case DRM_UNINST_HANDLER:
                return DRM(irq_uninstall)( dev );
        default:
                return -EINVAL;
        }
}
 
#if __HAVE_VBL_IRQ
 
int DRM(wait_vblank)(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data )
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->dev;
        drm_wait_vblank_t vblwait;
        struct timeval now;
        int ret = 0;
        unsigned int flags;
 
        if (!dev->irq)
                return -EINVAL;
 
        DRM_COPY_FROM_USER_IOCTL( vblwait, (drm_wait_vblank_t *)data,
                                  sizeof(vblwait) );
 
        switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) {
        case _DRM_VBLANK_RELATIVE:
                vblwait.request.sequence += atomic_read( &dev->vbl_received );
                vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
        case _DRM_VBLANK_ABSOLUTE:
                break;
        default:
                return -EINVAL;
        }
 
        flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
 
        if ( flags & _DRM_VBLANK_SIGNAL ) {
                unsigned long irqflags;
                drm_vbl_sig_t *vbl_sig;
 
                vblwait.reply.sequence = atomic_read( &dev->vbl_received );
 
                spin_lock_irqsave( &dev->vbl_lock, irqflags );
 
                /* Check if this task has already scheduled the same signal
                 * for the same vblank sequence number; nothing to be done in
                 * that case
                 */
                list_for_each( ( (struct list_head *) vbl_sig ), &dev->vbl_sigs.head ) {
                        if (vbl_sig->sequence == vblwait.request.sequence
                            && vbl_sig->info.si_signo == vblwait.request.signal
                            && vbl_sig->task == current)
                        {
                                spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
                                goto done;
                        }
                }
 
                if ( dev->vbl_pending >= 100 ) {
                        spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
                        return -EBUSY;
                }
 
                dev->vbl_pending++;
 
                spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
 
                if ( !( vbl_sig = kmalloc(sizeof(drm_vbl_sig_t), GFP_KERNEL) ) )
                        return -ENOMEM;
 
 
                memset( (void *)vbl_sig, 0, sizeof(*vbl_sig) );
 
                vbl_sig->sequence = vblwait.request.sequence;
                vbl_sig->info.si_signo = vblwait.request.signal;
                vbl_sig->task = current;
 
                spin_lock_irqsave( &dev->vbl_lock, irqflags );
 
                list_add_tail( (struct list_head *) vbl_sig, &dev->vbl_sigs.head );
 
                spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
        } else {
                ret = DRM(vblank_wait)( dev, &vblwait.request.sequence );
 
                do_gettimeofday( &now );
                vblwait.reply.tval_sec = now.tv_sec;
                vblwait.reply.tval_usec = now.tv_usec;
        }
 
done:
        DRM_COPY_TO_USER_IOCTL( (drm_wait_vblank_t *)data, vblwait,
                                sizeof(vblwait) );
 
        return ret;
}
 
void DRM(vbl_send_signals)( drm_device_t *dev )
{
        struct list_head *tmp;
        drm_vbl_sig_t *vbl_sig;
        unsigned int vbl_seq = atomic_read( &dev->vbl_received );
        unsigned long flags;
 
        spin_lock_irqsave( &dev->vbl_lock, flags );
 
        list_for_each_safe( ( (struct list_head *) vbl_sig ), tmp, &dev->vbl_sigs.head ) {
                if ( ( vbl_seq - vbl_sig->sequence ) <= (1<<23) ) {
                        vbl_sig->info.si_code = vbl_seq;
                        send_sig_info( vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task );
 
                        list_del( (struct list_head *) vbl_sig );
 
 
                        kfree( vbl_sig );
                        dev->vbl_pending--;
                }
        }
 
        spin_unlock_irqrestore( &dev->vbl_lock, flags );
}
 
#endif  /* __HAVE_VBL_IRQ */
 
#else
 
int DRM(control)( struct inode *inode, struct file *filp,
                  unsigned int cmd, unsigned long arg )
{
        drm_control_t ctl;
 
        if ( copy_from_user( &ctl, (drm_control_t *)arg, sizeof(ctl) ) )
                return -EFAULT;
 
        switch ( ctl.func ) {
        case DRM_INST_HANDLER:
        case DRM_UNINST_HANDLER:
                return 0;
        default:
                return -EINVAL;
        }
}
 
#endif /* __HAVE_DMA_IRQ */
 
#endif /* __HAVE_DMA */

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [drm/] [drm_dma.h] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/* drm_dma.c -- DMA IOCTL and function support -- linux-c --`
2			`* Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com`
3			`*`
4			`* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.`
5			`* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.`
6			`* All Rights Reserved.`
7			`*`
8			`* Permission is hereby granted, free of charge, to any person obtaining a`
9			`* copy of this software and associated documentation files (the "Software"),`
10			`* to deal in the Software without restriction, including without limitation`
11			`* the rights to use, copy, modify, merge, publish, distribute, sublicense,`
12			`* and/or sell copies of the Software, and to permit persons to whom the`
13			`* Software is furnished to do so, subject to the following conditions:`
14			`*`
15			`* The above copyright notice and this permission notice (including the next`
16			`* paragraph) shall be included in all copies or substantial portions of the`
17			`* Software.`
18			`*`
19			`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
20			`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
21			`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL`
22			`* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR`
23			`* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,`
24			`* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR`
25			`* OTHER DEALINGS IN THE SOFTWARE.`
26			`*`
27			`* Authors:`
28			`* Rickard E. (Rik) Faith <faith@valinux.com>`
29			`* Gareth Hughes <gareth@valinux.com>`
30			`*/`
31
32			`#include "drmP.h"`
33			`#include "drm_os_linux.h"`
34			`#include <linux/interrupt.h> /* For task queue support */`
35
36			`#ifndef __HAVE_DMA_WAITQUEUE`
37			`#define __HAVE_DMA_WAITQUEUE 0`
38			`#endif`
39			`#ifndef __HAVE_DMA_RECLAIM`
40			`#define __HAVE_DMA_RECLAIM 0`
41			`#endif`
42			`#ifndef __HAVE_SHARED_IRQ`
43			`#define __HAVE_SHARED_IRQ 0`
44			`#endif`
45
46			`#if __HAVE_SHARED_IRQ`
47			`#define DRM_IRQ_TYPE SA_SHIRQ`
48			`#else`
49			`#define DRM_IRQ_TYPE 0`
50			`#endif`
51
52			`#if __HAVE_DMA`
53
54			`int DRM(dma_setup)( drm_device_t *dev )`
55			`{`
56			`int i;`
57
58			`dev->dma = DRM(alloc)( sizeof(*dev->dma), DRM_MEM_DRIVER );`
59			`if ( !dev->dma )`
60			`return -ENOMEM;`
61
62			`memset( dev->dma, 0, sizeof(*dev->dma) );`
63
64			`for ( i = 0 ; i <= DRM_MAX_ORDER ; i++ )`
65			`memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));`
66
67			`return 0;`
68			`}`
69
70			`void DRM(dma_takedown)(drm_device_t *dev)`
71			`{`
72			`drm_device_dma_t *dma = dev->dma;`
73			`int i, j;`
74
75			`if (!dma) return;`
76
77			`/* Clear dma buffers */`
78			`for (i = 0; i <= DRM_MAX_ORDER; i++) {`
79			`if (dma->bufs[i].seg_count) {`
80			`DRM_DEBUG("order %d: buf_count = %d,"`
81			`" seg_count = %d\n",`
82			`i,`
83			`dma->bufs[i].buf_count,`
84			`dma->bufs[i].seg_count);`
85			`for (j = 0; j < dma->bufs[i].seg_count; j++) {`
86			`DRM(free_pages)(dma->bufs[i].seglist[j],`
87			`dma->bufs[i].page_order,`
88			`DRM_MEM_DMA);`
89			`}`
90			`DRM(free)(dma->bufs[i].seglist,`
91			`dma->bufs[i].seg_count`
92			`* sizeof(*dma->bufs[0].seglist),`
93			`DRM_MEM_SEGS);`
94			`}`
95			`if(dma->bufs[i].buf_count) {`
96			`for(j = 0; j < dma->bufs[i].buf_count; j++) {`
97			`if(dma->bufs[i].buflist[j].dev_private) {`
98			`DRM(free)(dma->bufs[i].buflist[j].dev_private,`
99			`dma->bufs[i].buflist[j].dev_priv_size,`
100			`DRM_MEM_BUFS);`
101			`}`
102			`}`
103			`DRM(free)(dma->bufs[i].buflist,`
104			`dma->bufs[i].buf_count *`
105			`sizeof(*dma->bufs[0].buflist),`
106			`DRM_MEM_BUFS);`
107			`#if __HAVE_DMA_FREELIST`
108			`DRM(freelist_destroy)(&dma->bufs[i].freelist);`
109			`#endif`
110			`}`
111			`}`
112
113			`if (dma->buflist) {`
114			`DRM(free)(dma->buflist,`
115			`dma->buf_count * sizeof(*dma->buflist),`
116			`DRM_MEM_BUFS);`
117			`}`
118
119			`if (dma->pagelist) {`
120			`DRM(free)(dma->pagelist,`
121			`dma->page_count * sizeof(*dma->pagelist),`
122			`DRM_MEM_PAGES);`
123			`}`
124			`DRM(free)(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);`
125			`dev->dma = NULL;`
126			`}`
127
128
129			`#if __HAVE_DMA_HISTOGRAM`
130			`/* This is slow, but is useful for debugging. */`
131			`int DRM(histogram_slot)(unsigned long count)`
132			`{`
133			`int value = DRM_DMA_HISTOGRAM_INITIAL;`
134			`int slot;`
135
136			`for (slot = 0;`
137			`slot < DRM_DMA_HISTOGRAM_SLOTS;`
138			`++slot, value = DRM_DMA_HISTOGRAM_NEXT(value)) {`
139			`if (count < value) return slot;`
140			`}`
141			`return DRM_DMA_HISTOGRAM_SLOTS - 1;`
142			`}`
143
144			`void DRM(histogram_compute)(drm_device_t dev, drm_buf_t buf)`
145			`{`
146			`cycles_t queued_to_dispatched;`
147			`cycles_t dispatched_to_completed;`
148			`cycles_t completed_to_freed;`
149			`int q2d, d2c, c2f, q2c, q2f;`
150
151			`if (buf->time_queued) {`
152			`queued_to_dispatched = (buf->time_dispatched`
153			`- buf->time_queued);`
154			`dispatched_to_completed = (buf->time_completed`
155			`- buf->time_dispatched);`
156			`completed_to_freed = (buf->time_freed`
157			`- buf->time_completed);`
158
159			`q2d = DRM(histogram_slot)(queued_to_dispatched);`
160			`d2c = DRM(histogram_slot)(dispatched_to_completed);`
161			`c2f = DRM(histogram_slot)(completed_to_freed);`
162
163			`q2c = DRM(histogram_slot)(queued_to_dispatched`
164			`+ dispatched_to_completed);`
165			`q2f = DRM(histogram_slot)(queued_to_dispatched`
166			`+ dispatched_to_completed`
167			`+ completed_to_freed);`
168
169			`atomic_inc(&dev->histo.total);`
170			`atomic_inc(&dev->histo.queued_to_dispatched[q2d]);`
171			`atomic_inc(&dev->histo.dispatched_to_completed[d2c]);`
172			`atomic_inc(&dev->histo.completed_to_freed[c2f]);`
173
174			`atomic_inc(&dev->histo.queued_to_completed[q2c]);`
175			`atomic_inc(&dev->histo.queued_to_freed[q2f]);`
176
177			`}`
178			`buf->time_queued = 0;`
179			`buf->time_dispatched = 0;`
180			`buf->time_completed = 0;`
181			`buf->time_freed = 0;`
182			`}`
183			`#endif`
184
185			`void DRM(free_buffer)(drm_device_t dev, drm_buf_t buf)`
186			`{`
187			`if (!buf) return;`
188
189			`buf->waiting = 0;`
190			`buf->pending = 0;`
191			`buf->pid = 0;`
192			`buf->used = 0;`
193			`#if __HAVE_DMA_HISTOGRAM`
194			`buf->time_completed = get_cycles();`
195			`#endif`
196
197			`if ( __HAVE_DMA_WAITQUEUE && waitqueue_active(&buf->dma_wait)) {`
198			`wake_up_interruptible(&buf->dma_wait);`
199			`}`
200			`#if __HAVE_DMA_FREELIST`
201			`else {`
202			`drm_device_dma_t *dma = dev->dma;`
203			`/* If processes are waiting, the last one`
204			`to wake will put the buffer on the free`
205			`list. If no processes are waiting, we`
206			`put the buffer on the freelist here. */`
207			`DRM(freelist_put)(dev, &dma->bufs[buf->order].freelist, buf);`
208			`}`
209			`#endif`
210			`}`
211
212			`#if !__HAVE_DMA_RECLAIM`
213			`void DRM(reclaim_buffers)(drm_device_t *dev, pid_t pid)`
214			`{`
215			`drm_device_dma_t *dma = dev->dma;`
216			`int i;`
217
218			`if (!dma) return;`
219			`for (i = 0; i < dma->buf_count; i++) {`
220			`if (dma->buflist[i]->pid == pid) {`
221			`switch (dma->buflist[i]->list) {`
222			`case DRM_LIST_NONE:`
223			`DRM(free_buffer)(dev, dma->buflist[i]);`
224			`break;`
225			`case DRM_LIST_WAIT:`
226			`dma->buflist[i]->list = DRM_LIST_RECLAIM;`
227			`break;`
228			`default:`
229			`/* Buffer already on hardware. */`
230			`break;`
231			`}`
232			`}`
233			`}`
234			`}`
235			`#endif`
236
237
238			`/* GH: This is a big hack for now...`
239			`*/`
240			`#if __HAVE_OLD_DMA`
241
242			`void DRM(clear_next_buffer)(drm_device_t *dev)`
243			`{`
244			`drm_device_dma_t *dma = dev->dma;`
245
246			`dma->next_buffer = NULL;`
247			`if (dma->next_queue && !DRM_BUFCOUNT(&dma->next_queue->waitlist)) {`
248			`wake_up_interruptible(&dma->next_queue->flush_queue);`
249			`}`
250			`dma->next_queue = NULL;`
251			`}`
252
253			`int DRM(select_queue)(drm_device_t dev, void (wrapper)(unsigned long))`
254			`{`
255			`int i;`
256			`int candidate = -1;`
257			`int j = jiffies;`
258
259			`if (!dev) {`
260			`DRM_ERROR("No device\n");`
261			`return -1;`
262			`}`
263			`if (!dev->queuelist \|\| !dev->queuelist[DRM_KERNEL_CONTEXT]) {`
264			`/* This only happens between the time the`
265			`interrupt is initialized and the time`
266			`the queues are initialized. */`
267			`return -1;`
268			`}`
269
270			`/* Doing "while locked" DMA? */`
271			`if (DRM_WAITCOUNT(dev, DRM_KERNEL_CONTEXT)) {`
272			`return DRM_KERNEL_CONTEXT;`
273			`}`
274
275			`/* If there are buffers on the last_context`
276			`queue, and we have not been executing`
277			`this context very long, continue to`
278			`execute this context. */`
279			`if (dev->last_switch <= j`
280			`&& dev->last_switch + DRM_TIME_SLICE > j`
281			`&& DRM_WAITCOUNT(dev, dev->last_context)) {`
282			`return dev->last_context;`
283			`}`
284
285			`/* Otherwise, find a candidate */`
286			`for (i = dev->last_checked + 1; i < dev->queue_count; i++) {`
287			`if (DRM_WAITCOUNT(dev, i)) {`
288			`candidate = dev->last_checked = i;`
289			`break;`
290			`}`
291			`}`
292
293			`if (candidate < 0) {`
294			`for (i = 0; i < dev->queue_count; i++) {`
295			`if (DRM_WAITCOUNT(dev, i)) {`
296			`candidate = dev->last_checked = i;`
297			`break;`
298			`}`
299			`}`
300			`}`
301
302			`if (wrapper`
303			`&& candidate >= 0`
304			`&& candidate != dev->last_context`
305			`&& dev->last_switch <= j`
306			`&& dev->last_switch + DRM_TIME_SLICE > j) {`
307			`if (dev->timer.expires != dev->last_switch + DRM_TIME_SLICE) {`
308			`del_timer(&dev->timer);`
309			`dev->timer.function = wrapper;`
310			`dev->timer.data = (unsigned long)dev;`
311			`dev->timer.expires = dev->last_switch+DRM_TIME_SLICE;`
312			`add_timer(&dev->timer);`
313			`}`
314			`return -1;`
315			`}`
316
317			`return candidate;`
318			`}`
319
320
321			`int DRM(dma_enqueue)(drm_device_t dev, drm_dma_t d)`
322			`{`
323			`int i;`
324			`drm_queue_t *q;`
325			`drm_buf_t *buf;`
326			`int idx;`
327			`int while_locked = 0;`
328			`drm_device_dma_t *dma = dev->dma;`
329			`DECLARE_WAITQUEUE(entry, current);`
330
331			`DRM_DEBUG("%d\n", d->send_count);`
332
333			`if (d->flags & _DRM_DMA_WHILE_LOCKED) {`
334			`int context = dev->lock.hw_lock->lock;`
335
336			`if (!_DRM_LOCK_IS_HELD(context)) {`
337			`DRM_ERROR("No lock held during \"while locked\""`
338			`" request\n");`
339			`return -EINVAL;`
340			`}`
341			`if (d->context != _DRM_LOCKING_CONTEXT(context)`
342			`&& _DRM_LOCKING_CONTEXT(context) != DRM_KERNEL_CONTEXT) {`
343			`DRM_ERROR("Lock held by %d while %d makes"`
344			`" \"while locked\" request\n",`
345			`_DRM_LOCKING_CONTEXT(context),`
346			`d->context);`
347			`return -EINVAL;`
348			`}`
349			`q = dev->queuelist[DRM_KERNEL_CONTEXT];`
350			`while_locked = 1;`
351			`} else {`
352			`q = dev->queuelist[d->context];`
353			`}`
354
355
356			`atomic_inc(&q->use_count);`
357			`if (atomic_read(&q->block_write)) {`
358			`add_wait_queue(&q->write_queue, &entry);`
359			`atomic_inc(&q->block_count);`
360			`for (;;) {`
361			`current->state = TASK_INTERRUPTIBLE;`
362			`if (!atomic_read(&q->block_write)) break;`
363			`schedule();`
364			`if (signal_pending(current)) {`
365			`atomic_dec(&q->use_count);`
366			`remove_wait_queue(&q->write_queue, &entry);`
367			`return -EINTR;`
368			`}`
369			`}`
370			`atomic_dec(&q->block_count);`
371			`current->state = TASK_RUNNING;`
372			`remove_wait_queue(&q->write_queue, &entry);`
373			`}`
374
375			`for (i = 0; i < d->send_count; i++) {`
376			`idx = d->send_indices[i];`
377			`if (idx < 0 \|\| idx >= dma->buf_count) {`
378			`atomic_dec(&q->use_count);`
379			`DRM_ERROR("Index %d (of %d max)\n",`
380			`d->send_indices[i], dma->buf_count - 1);`
381			`return -EINVAL;`
382			`}`
383			`buf = dma->buflist[ idx ];`
384			`if (buf->pid != current->pid) {`
385			`atomic_dec(&q->use_count);`
386			`DRM_ERROR("Process %d using buffer owned by %d\n",`
387			`current->pid, buf->pid);`
388			`return -EINVAL;`
389			`}`
390			`if (buf->list != DRM_LIST_NONE) {`
391			`atomic_dec(&q->use_count);`
392			`DRM_ERROR("Process %d using buffer %d on list %d\n",`
393			`current->pid, buf->idx, buf->list);`
394			`}`
395			`buf->used = d->send_sizes[i];`
396			`buf->while_locked = while_locked;`
397			`buf->context = d->context;`
398			`if (!buf->used) {`
399			`DRM_ERROR("Queueing 0 length buffer\n");`
400			`}`
401			`if (buf->pending) {`
402			`atomic_dec(&q->use_count);`
403			`DRM_ERROR("Queueing pending buffer:"`
404			`" buffer %d, offset %d\n",`
405			`d->send_indices[i], i);`
406			`return -EINVAL;`
407			`}`
408			`if (buf->waiting) {`
409			`atomic_dec(&q->use_count);`
410			`DRM_ERROR("Queueing waiting buffer:"`
411			`" buffer %d, offset %d\n",`
412			`d->send_indices[i], i);`
413			`return -EINVAL;`
414			`}`
415			`buf->waiting = 1;`
416			`if (atomic_read(&q->use_count) == 1`
417			`\|\| atomic_read(&q->finalization)) {`
418			`DRM(free_buffer)(dev, buf);`
419			`} else {`
420			`DRM(waitlist_put)(&q->waitlist, buf);`
421			`atomic_inc(&q->total_queued);`
422			`}`
423			`}`
424			`atomic_dec(&q->use_count);`
425
426			`return 0;`
427			`}`
428
429			`static int DRM(dma_get_buffers_of_order)(drm_device_t dev, drm_dma_t d,`
430			`int order)`
431			`{`
432			`int i;`
433			`drm_buf_t *buf;`
434			`drm_device_dma_t *dma = dev->dma;`
435
436			`for (i = d->granted_count; i < d->request_count; i++) {`
437			`buf = DRM(freelist_get)(&dma->bufs[order].freelist,`
438			`d->flags & _DRM_DMA_WAIT);`
439			`if (!buf) break;`
440			`if (buf->pending \|\| buf->waiting) {`
441			`DRM_ERROR("Free buffer %d in use by %d (w%d, p%d)\n",`
442			`buf->idx,`
443			`buf->pid,`
444			`buf->waiting,`
445			`buf->pending);`
446			`}`
447			`buf->pid = current->pid;`
448			`if (copy_to_user(&d->request_indices[i],`
449			`&buf->idx,`
450			`sizeof(buf->idx)))`
451			`return -EFAULT;`
452
453			`if (copy_to_user(&d->request_sizes[i],`
454			`&buf->total,`
455			`sizeof(buf->total)))`
456			`return -EFAULT;`
457
458			`++d->granted_count;`
459			`}`
460			`return 0;`
461			`}`
462
463
464			`int DRM(dma_get_buffers)(drm_device_t dev, drm_dma_t dma)`
465			`{`
466			`int order;`
467			`int retcode = 0;`
468			`int tmp_order;`
469
470			`order = DRM(order)(dma->request_size);`
471
472			`dma->granted_count = 0;`
473			`retcode = DRM(dma_get_buffers_of_order)(dev, dma, order);`
474
475			`if (dma->granted_count < dma->request_count`
476			`&& (dma->flags & _DRM_DMA_SMALLER_OK)) {`
477			`for (tmp_order = order - 1;`
478			`!retcode`
479			`&& dma->granted_count < dma->request_count`
480			`&& tmp_order >= DRM_MIN_ORDER;`
481			`--tmp_order) {`
482
483			`retcode = DRM(dma_get_buffers_of_order)(dev, dma,`
484			`tmp_order);`
485			`}`
486			`}`
487
488			`if (dma->granted_count < dma->request_count`
489			`&& (dma->flags & _DRM_DMA_LARGER_OK)) {`
490			`for (tmp_order = order + 1;`
491			`!retcode`
492			`&& dma->granted_count < dma->request_count`
493			`&& tmp_order <= DRM_MAX_ORDER;`
494			`++tmp_order) {`
495
496			`retcode = DRM(dma_get_buffers_of_order)(dev, dma,`
497			`tmp_order);`
498			`}`
499			`}`
500			`return 0;`
501			`}`
502
503			`#endif /* __HAVE_OLD_DMA */`
504
505
506			`#if __HAVE_DMA_IRQ`
507
508			`int DRM(irq_install)( drm_device_t *dev, int irq )`
509			`{`
510			`int ret;`
511
512			`if ( !irq )`
513			`return -EINVAL;`
514
515			`down( &dev->struct_sem );`
516			`if ( dev->irq ) {`
517			`up( &dev->struct_sem );`
518			`return -EBUSY;`
519			`}`
520			`dev->irq = irq;`
521			`up( &dev->struct_sem );`
522
523			`DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );`
524
525			`dev->context_flag = 0;`
526			`dev->interrupt_flag = 0;`
527			`dev->dma_flag = 0;`
528
529			`dev->dma->next_buffer = NULL;`
530			`dev->dma->next_queue = NULL;`
531			`dev->dma->this_buffer = NULL;`
532
533			`#if __HAVE_DMA_IRQ_BH`
534			`INIT_LIST_HEAD( &dev->tq.list );`
535			`dev->tq.sync = 0;`
536			`dev->tq.routine = DRM(dma_immediate_bh);`
537			`dev->tq.data = dev;`
538			`#endif`
539
540			`#if __HAVE_VBL_IRQ`
541			`init_waitqueue_head(&dev->vbl_queue);`
542
543			`spin_lock_init( &dev->vbl_lock );`
544
545			`INIT_LIST_HEAD( &dev->vbl_sigs.head );`
546
547			`dev->vbl_pending = 0;`
548			`#endif`
549
550			`/* Before installing handler */`
551			`DRM(driver_irq_preinstall)(dev);`
552
553			`/* Install handler */`
554			`ret = request_irq( dev->irq, DRM(dma_service),`
555			`DRM_IRQ_TYPE, dev->devname, dev );`
556			`if ( ret < 0 ) {`
557			`down( &dev->struct_sem );`
558			`dev->irq = 0;`
559			`up( &dev->struct_sem );`
560			`return ret;`
561			`}`
562
563			`/* After installing handler */`
564			`DRM(driver_irq_postinstall)(dev);`
565
566			`return 0;`
567			`}`
568
569			`int DRM(irq_uninstall)( drm_device_t *dev )`
570			`{`
571			`int irq;`
572
573			`down( &dev->struct_sem );`
574			`irq = dev->irq;`
575			`dev->irq = 0;`
576			`up( &dev->struct_sem );`
577
578			`if ( !irq )`
579			`return -EINVAL;`
580
581			`DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );`
582
583			`DRM(driver_irq_uninstall)( dev );`
584
585			`free_irq( irq, dev );`
586
587			`return 0;`
588			`}`
589
590			`int DRM(control)( struct inode inode, struct file filp,`
591			`unsigned int cmd, unsigned long arg )`
592			`{`
593			`drm_file_t *priv = filp->private_data;`
594			`drm_device_t *dev = priv->dev;`
595			`drm_control_t ctl;`
596
597			`if ( copy_from_user( &ctl, (drm_control_t *)arg, sizeof(ctl) ) )`
598			`return -EFAULT;`
599
600			`switch ( ctl.func ) {`
601			`case DRM_INST_HANDLER:`
602			`return DRM(irq_install)( dev, ctl.irq );`
603			`case DRM_UNINST_HANDLER:`
604			`return DRM(irq_uninstall)( dev );`
605			`default:`
606			`return -EINVAL;`
607			`}`
608			`}`
609
610			`#if __HAVE_VBL_IRQ`
611
612			`int DRM(wait_vblank)(struct inode inode, struct file filp, unsigned int cmd, unsigned long data )`
613			`{`
614			`drm_file_t *priv = filp->private_data;`
615			`drm_device_t *dev = priv->dev;`
616			`drm_wait_vblank_t vblwait;`
617			`struct timeval now;`
618			`int ret = 0;`
619			`unsigned int flags;`
620
621			`if (!dev->irq)`
622			`return -EINVAL;`
623
624			`DRM_COPY_FROM_USER_IOCTL( vblwait, (drm_wait_vblank_t *)data,`
625			`sizeof(vblwait) );`
626
627			`switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) {`
628			`case _DRM_VBLANK_RELATIVE:`
629			`vblwait.request.sequence += atomic_read( &dev->vbl_received );`
630			`vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;`
631			`case _DRM_VBLANK_ABSOLUTE:`
632			`break;`
633			`default:`
634			`return -EINVAL;`
635			`}`
636
637			`flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;`
638
639			`if ( flags & _DRM_VBLANK_SIGNAL ) {`
640			`unsigned long irqflags;`
641			`drm_vbl_sig_t *vbl_sig;`
642
643			`vblwait.reply.sequence = atomic_read( &dev->vbl_received );`
644
645			`spin_lock_irqsave( &dev->vbl_lock, irqflags );`
646
647			`/* Check if this task has already scheduled the same signal`
648			`* for the same vblank sequence number; nothing to be done in`
649			`* that case`
650			`*/`
651			`list_for_each( ( (struct list_head *) vbl_sig ), &dev->vbl_sigs.head ) {`
652			`if (vbl_sig->sequence == vblwait.request.sequence`
653			`&& vbl_sig->info.si_signo == vblwait.request.signal`
654			`&& vbl_sig->task == current)`
655			`{`
656			`spin_unlock_irqrestore( &dev->vbl_lock, irqflags );`
657			`goto done;`
658			`}`
659			`}`
660
661			`if ( dev->vbl_pending >= 100 ) {`
662			`spin_unlock_irqrestore( &dev->vbl_lock, irqflags );`
663			`return -EBUSY;`
664			`}`
665
666			`dev->vbl_pending++;`
667
668			`spin_unlock_irqrestore( &dev->vbl_lock, irqflags );`
669
670			`if ( !( vbl_sig = kmalloc(sizeof(drm_vbl_sig_t), GFP_KERNEL) ) )`
671			`return -ENOMEM;`
672
673
674			`memset( (void )vbl_sig, 0, sizeof(vbl_sig) );`
675
676			`vbl_sig->sequence = vblwait.request.sequence;`
677			`vbl_sig->info.si_signo = vblwait.request.signal;`
678			`vbl_sig->task = current;`
679
680			`spin_lock_irqsave( &dev->vbl_lock, irqflags );`
681
682			`list_add_tail( (struct list_head *) vbl_sig, &dev->vbl_sigs.head );`
683
684			`spin_unlock_irqrestore( &dev->vbl_lock, irqflags );`
685			`} else {`
686			`ret = DRM(vblank_wait)( dev, &vblwait.request.sequence );`
687
688			`do_gettimeofday( &now );`
689			`vblwait.reply.tval_sec = now.tv_sec;`
690			`vblwait.reply.tval_usec = now.tv_usec;`
691			`}`
692
693			`done:`
694			`DRM_COPY_TO_USER_IOCTL( (drm_wait_vblank_t *)data, vblwait,`
695			`sizeof(vblwait) );`
696
697			`return ret;`
698			`}`
699
700			`void DRM(vbl_send_signals)( drm_device_t *dev )`
701			`{`
702			`struct list_head *tmp;`
703			`drm_vbl_sig_t *vbl_sig;`
704			`unsigned int vbl_seq = atomic_read( &dev->vbl_received );`
705			`unsigned long flags;`
706
707			`spin_lock_irqsave( &dev->vbl_lock, flags );`
708
709			`list_for_each_safe( ( (struct list_head *) vbl_sig ), tmp, &dev->vbl_sigs.head ) {`
710			`if ( ( vbl_seq - vbl_sig->sequence ) <= (1<<23) ) {`
711			`vbl_sig->info.si_code = vbl_seq;`
712			`send_sig_info( vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task );`
713
714			`list_del( (struct list_head *) vbl_sig );`
715
716
717			`kfree( vbl_sig );`
718			`dev->vbl_pending--;`
719			`}`
720			`}`
721
722			`spin_unlock_irqrestore( &dev->vbl_lock, flags );`
723			`}`
724
725			`#endif /* __HAVE_VBL_IRQ */`
726
727			`#else`
728
729			`int DRM(control)( struct inode inode, struct file filp,`
730			`unsigned int cmd, unsigned long arg )`
731			`{`
732			`drm_control_t ctl;`
733
734			`if ( copy_from_user( &ctl, (drm_control_t *)arg, sizeof(ctl) ) )`
735			`return -EFAULT;`
736
737			`switch ( ctl.func ) {`
738			`case DRM_INST_HANDLER:`
739			`case DRM_UNINST_HANDLER:`
740			`return 0;`
741			`default:`
742			`return -EINVAL;`
743			`}`
744			`}`
745
746			`#endif /* __HAVE_DMA_IRQ */`
747
748			`#endif /* __HAVE_DMA */`