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drm/linux-core/drm_dma.c

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/**
* \file drm_dma.h
* DMA IOCTL and function support
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* 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.
*/
#define __NO_VERSION__
#include "drmP.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
/**
* Initialize the DMA data.
*
* \param dev DRM device.
* \return zero on success or a negative value on failure.
*
* Allocate and initialize a drm_device_dma structure.
*/
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;
}
/**
* Cleanup the DMA resources.
*
* \param dev DRM device.
*
* Free all pages associated with DMA buffers, the buffers and pages lists, and
* finally the the drm_device::dma structure itself.
*/
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++) {
if (dma->bufs[i].seglist[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;
}
/**
* Free a buffer.
*
* \param dev DRM device.
* \param buf buffer to free.
*
* Resets the fields of \p buf.
*/
void DRM(free_buffer)(drm_device_t *dev, drm_buf_t *buf)
{
if (!buf) return;
buf->waiting = 0;
buf->pending = 0;
buf->filp = 0;
buf->used = 0;
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
/**
* Reclaim the buffers.
*
* \param filp file pointer.
*
* Frees each buffer associated with \p filp not already on the hardware.
*/
void DRM(reclaim_buffers)( struct file *filp )
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_device_dma_t *dma = dev->dma;
int i;
if (!dma) return;
for (i = 0; i < dma->buf_count; i++) {
if (dma->buflist[i]->filp == filp) {
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
#if __HAVE_DMA_IRQ
/**
* Install IRQ handler.
*
* \param dev DRM device.
* \param irq IRQ number.
*
* Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
* \c DRM(driver_irq_preinstall)() and \c DRM(driver_irq_postinstall)() functions
* before and after the installation.
*/
int DRM(irq_install)( drm_device_t *dev, int irq )
{
int ret;
if ( !irq )
return -EINVAL;
down( &dev->struct_sem );
/* Driver must have been initialized */
if ( !dev->dev_private ) {
up( &dev->struct_sem );
return -EINVAL;
}
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
#if !HAS_WORKQUEUE
INIT_LIST_HEAD( &dev->tq.list );
dev->tq.sync = 0;
dev->tq.routine = DRM(dma_immediate_bh);
dev->tq.data = dev;
#else
INIT_WORK(&dev->work, DRM(dma_immediate_bh), dev);
#endif
#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;
}
/**
* Uninstall the IRQ handler.
*
* \param dev DRM device.
*
* Calls the driver's \c DRM(driver_irq_uninstall)() function, and stops the irq.
*/
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;
}
/**
* IRQ control ioctl.
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg user argument, pointing to a drm_control structure.
* \return zero on success or a negative number on failure.
*
* Calls irq_install() or irq_uninstall() according to \p arg.
*/
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
/**
* Wait for VBLANK.
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param data user argument, pointing to a drm_wait_vblank structure.
* \return zero on success or a negative number on failure.
*
* Verifies the IRQ is installed.
*
* If a signal is requested checks if this task has already scheduled the same signal
* for the same vblank sequence number - nothing to be done in
* that case. If the number of tasks waiting for the interrupt exceeds 100 the
* function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
* task.
*
* If a signal is not requested, then calls vblank_wait().
*/
int DRM(wait_vblank)( DRM_IOCTL_ARGS )
{
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_entry( vbl_sig, &dev->vbl_sigs.head, 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 = DRM_MALLOC( sizeof( drm_vbl_sig_t ) ) ) ) {
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;
}
/**
* Send the VBLANK signals.
*
* \param dev DRM device.
*
* Sends a signal for each task in drm_device::vbl_sigs and empties the list.
*
* If a signal is not requested, then calls vblank_wait().
*/
void DRM(vbl_send_signals)( drm_device_t *dev )
{
struct list_head *list, *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( list, tmp, &dev->vbl_sigs.head ) {
vbl_sig = list_entry( list, drm_vbl_sig_t, 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( list );
DRM_FREE( vbl_sig, sizeof(*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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