drm_drv.h

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

	int i;
#if __HAVE_CTX_BITMAP
	int retcode;
#endif
	DRM_DEBUG( "\n" );

#ifdef MODULE
	DRM(parse_options)( drm_opts );
#endif

	DRM(numdevs) = drm_count_cards();
	/* Force at least one instance. */
	if (DRM(numdevs) <= 0)
		DRM(numdevs) = 1;

	DRM(device) = kmalloc(sizeof(*DRM(device)) * DRM(numdevs), GFP_KERNEL);
	if (!DRM(device)) {
		return -ENOMEM;
	}
	DRM(minor) = kmalloc(sizeof(*DRM(minor)) * DRM(numdevs), GFP_KERNEL);
	if (!DRM(minor)) {
		kfree(DRM(device));
		return -ENOMEM;
	}

	DRIVER_PREINIT();

	DRM(mem_init)();

	for (i = 0; i < DRM(numdevs); i++) {
		dev = &(DRM(device)[i]);
		memset( (void *)dev, 0, sizeof(*dev) );
		dev->count_lock = SPIN_LOCK_UNLOCKED;
		sema_init( &dev->struct_sem, 1 );

		if ((DRM(minor)[i] = DRM(stub_register)(DRIVER_NAME, &DRM(fops),dev)) < 0)
			return -EPERM;
		dev->device = MKDEV(DRM_MAJOR, DRM(minor)[i] );
		dev->name   = DRIVER_NAME;

#if __REALLY_HAVE_AGP
		dev->agp = DRM(agp_init)();
#if __MUST_HAVE_AGP
		if ( dev->agp == NULL ) {
			DRM_ERROR( "Cannot initialize the agpgart module.\n" );
			DRM(stub_unregister)(DRM(minor)[i]);
			DRM(takedown)( dev );
			return -ENOMEM;
		}
#endif
#if __REALLY_HAVE_MTRR
		if (dev->agp)
			dev->agp->agp_mtrr = mtrr_add( dev->agp->agp_info.aper_base,
				       dev->agp->agp_info.aper_size*1024*1024,
				       MTRR_TYPE_WRCOMB,
				       1 );
#endif
#endif

#if __HAVE_CTX_BITMAP
		retcode = DRM(ctxbitmap_init)( dev );
		if( retcode ) {
			DRM_ERROR( "Cannot allocate memory for context bitmap.\n" );
			DRM(stub_unregister)(DRM(minor)[i]);
			DRM(takedown)( dev );
			return retcode;
		}
#endif
		DRM_INFO( "Initialized %s %d.%d.%d %s on minor %d\n",
		  	DRIVER_NAME,
		  	DRIVER_MAJOR,
		  	DRIVER_MINOR,
		  	DRIVER_PATCHLEVEL,
		  	DRIVER_DATE,
		  	DRM(minor)[i] );
	}

	DRIVER_POSTINIT();

	return 0;
}

/* drm_cleanup is called via cleanup_module at module unload time.
 */
static void __exit drm_cleanup( void )
{
	drm_device_t *dev;
	int i;

	DRM_DEBUG( "\n" );

	for (i = DRM(numdevs) - 1; i >= 0; i--) {
		dev = &(DRM(device)[i]);
		if ( DRM(stub_unregister)(DRM(minor)[i]) ) {
			DRM_ERROR( "Cannot unload module\n" );
		} else {
			DRM_DEBUG("minor %d unregistered\n", DRM(minor)[i]);
			if (i == 0) {
				DRM_INFO( "Module unloaded\n" );
			}
		}
#if __HAVE_CTX_BITMAP
		DRM(ctxbitmap_cleanup)( dev );
#endif

#if __REALLY_HAVE_AGP && __REALLY_HAVE_MTRR
		if ( dev->agp && dev->agp->agp_mtrr >= 0) {
			int retval;
			retval = mtrr_del( dev->agp->agp_mtrr,
				   dev->agp->agp_info.aper_base,
				   dev->agp->agp_info.aper_size*1024*1024 );
			DRM_DEBUG( "mtrr_del=%d\n", retval );
		}
#endif

		DRM(takedown)( dev );

#if __REALLY_HAVE_AGP
		if ( dev->agp ) {
			DRM(agp_uninit)();
			DRM(free)( dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS );
			dev->agp = NULL;
		}
#endif
	}
	DRIVER_POSTCLEANUP();
	kfree(DRM(minor));
	kfree(DRM(device));
	DRM(numdevs) = 0;
}

module_init( drm_init );
module_exit( drm_cleanup );


int DRM(version)( struct inode *inode, struct file *filp,
		  unsigned int cmd, unsigned long arg )
{
	drm_version_t version;
	int len;

	if ( copy_from_user( &version,
			     (drm_version_t *)arg,
			     sizeof(version) ) )
		return -EFAULT;

#define DRM_COPY( name, value )						\
	len = strlen( value );						\
	if ( len > name##_len ) len = name##_len;			\
	name##_len = strlen( value );					\
	if ( len && name ) {						\
		if ( copy_to_user( name, value, len ) )			\
			return -EFAULT;					\
	}

	version.version_major = DRIVER_MAJOR;
	version.version_minor = DRIVER_MINOR;
	version.version_patchlevel = DRIVER_PATCHLEVEL;

	DRM_COPY( version.name, DRIVER_NAME );
	DRM_COPY( version.date, DRIVER_DATE );
	DRM_COPY( version.desc, DRIVER_DESC );

	if ( copy_to_user( (drm_version_t *)arg,
			   &version,
			   sizeof(version) ) )
		return -EFAULT;
	return 0;
}

int DRM(open)( struct inode *inode, struct file *filp )
{
	drm_device_t *dev = NULL;
	int retcode = 0;
	int i;

	for (i = 0; i < DRM(numdevs); i++) {
		if (MINOR(inode->i_rdev) == DRM(minor)[i]) {
			dev = &(DRM(device)[i]);
			break;
		}
	}
	if (!dev) {
		return -ENODEV;
	}

	DRM_DEBUG( "open_count = %d\n", dev->open_count );

	retcode = DRM(open_helper)( inode, filp, dev );
	if ( !retcode ) {
#if LINUX_VERSION_CODE < 0x020333
		MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
		atomic_inc( &dev->counts[_DRM_STAT_OPENS] );
		spin_lock( &dev->count_lock );
		if ( !dev->open_count++ ) {
			spin_unlock( &dev->count_lock );
			return DRM(setup)( dev );
		}
		spin_unlock( &dev->count_lock );
	}

	return retcode;
}

int DRM(release)( struct inode *inode, struct file *filp )
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev;
	int retcode = 0;

	lock_kernel();
	dev = priv->dev;

	DRM_DEBUG( "open_count = %d\n", dev->open_count );

	DRIVER_PRERELEASE();

	/* ========================================================
	 * Begin inline drm_release
	 */

	DRM_DEBUG( "pid = %d, device = 0x%x, open_count = %d\n",
		   current->pid, dev->device, dev->open_count );

	if ( dev->lock.hw_lock &&
	     _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) &&
	     dev->lock.pid == current->pid ) {
		DRM_DEBUG( "Process %d dead, freeing lock for context %d\n",
			   current->pid,
			   _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock) );
#if __HAVE_RELEASE
		DRIVER_RELEASE();
#endif
		DRM(lock_free)( dev, &dev->lock.hw_lock->lock,
				_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock) );

				/* FIXME: may require heavy-handed reset of
                                   hardware at this point, possibly
                                   processed via a callback to the X
                                   server. */
	}
#if __HAVE_RELEASE
	else if ( dev->lock.hw_lock ) {
		/* The lock is required to reclaim buffers */
		DECLARE_WAITQUEUE( entry, current );
		add_wait_queue( &dev->lock.lock_queue, &entry );
		for (;;) {
			current->state = TASK_INTERRUPTIBLE;
			if ( !dev->lock.hw_lock ) {
				/* Device has been unregistered */
				retcode = -EINTR;
				break;
			}
			if ( DRM(lock_take)( &dev->lock.hw_lock->lock,
					     DRM_KERNEL_CONTEXT ) ) {
				dev->lock.pid	    = priv->pid;
				dev->lock.lock_time = jiffies;
                                atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
				break;	/* Got lock */
			}
				/* Contention */
#if 0
			atomic_inc( &dev->total_sleeps );
#endif
			schedule();
			if ( signal_pending( current ) ) {
				retcode = -ERESTARTSYS;
				break;
			}
		}
		current->state = TASK_RUNNING;
		remove_wait_queue( &dev->lock.lock_queue, &entry );
		if( !retcode ) {
			DRIVER_RELEASE();
			DRM(lock_free)( dev, &dev->lock.hw_lock->lock,
					DRM_KERNEL_CONTEXT );
		}
	}
#elif __HAVE_DMA
	DRM(reclaim_buffers)( dev, priv->pid );
#endif

	DRM(fasync)( -1, filp, 0 );

	down( &dev->struct_sem );
	if ( priv->remove_auth_on_close == 1 ) {
		drm_file_t *temp = dev->file_first;
		while ( temp ) {
			temp->authenticated = 0;
			temp = temp->next;
		}
	}
	if ( priv->prev ) {
		priv->prev->next = priv->next;
	} else {
		dev->file_first	 = priv->next;
	}
	if ( priv->next ) {
		priv->next->prev = priv->prev;
	} else {
		dev->file_last	 = priv->prev;
	}
	up( &dev->struct_sem );

	DRM(free)( priv, sizeof(*priv), DRM_MEM_FILES );

	/* ========================================================
	 * End inline drm_release
	 */

#if LINUX_VERSION_CODE < 0x020333
	MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
	atomic_inc( &dev->counts[_DRM_STAT_CLOSES] );
	spin_lock( &dev->count_lock );
	if ( !--dev->open_count ) {
		if ( atomic_read( &dev->ioctl_count ) || dev->blocked ) {
			DRM_ERROR( "Device busy: %d %d\n",
				   atomic_read( &dev->ioctl_count ),
				   dev->blocked );
			spin_unlock( &dev->count_lock );
			unlock_kernel();
			return -EBUSY;
		}
		spin_unlock( &dev->count_lock );
		unlock_kernel();
		return DRM(takedown)( dev );
	}
	spin_unlock( &dev->count_lock );

	unlock_kernel();
	return retcode;
}

/* DRM(ioctl) is called whenever a process performs an ioctl on /dev/drm.
 */
int DRM(ioctl)( 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_ioctl_desc_t *ioctl;
	drm_ioctl_t *func;
	int nr = DRM_IOCTL_NR(cmd);
	int retcode = 0;

	atomic_inc( &dev->ioctl_count );
	atomic_inc( &dev->counts[_DRM_STAT_IOCTLS] );
	++priv->ioctl_count;

	DRM_DEBUG( "pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%x, auth=%d\n",
		   current->pid, cmd, nr, dev->device, priv->authenticated );

	if ( nr >= DRIVER_IOCTL_COUNT ) {
		retcode = -EINVAL;
	} else {
		ioctl = &DRM(ioctls)[nr];
		func = ioctl->func;

		if ( !func ) {
			DRM_DEBUG( "no function\n" );
			retcode = -EINVAL;
		} else if ( ( ioctl->root_only && !capable( CAP_SYS_ADMIN ) )||
			    ( ioctl->auth_needed && !priv->authenticated ) ) {
			retcode = -EACCES;
		} else {
			retcode = func( inode, filp, cmd, arg );
		}
	}

	atomic_dec( &dev->ioctl_count );
	return retcode;
}

int DRM(lock)( 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;
        DECLARE_WAITQUEUE( entry, current );
        drm_lock_t lock;
        int ret = 0;
#if __HAVE_MULTIPLE_DMA_QUEUES
	drm_queue_t *q;
#endif
#if __HAVE_DMA_HISTOGRAM
        cycles_t start;

        dev->lck_start = start = get_cycles();
#endif

        if ( copy_from_user( &lock, (drm_lock_t *)arg, sizeof(lock) ) )
		return -EFAULT;

        if ( lock.context == DRM_KERNEL_CONTEXT ) {
                DRM_ERROR( "Process %d using kernel context %d\n",
			   current->pid, lock.context );
                return -EINVAL;
        }

        DRM_DEBUG( "%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
		   lock.context, current->pid,
		   dev->lock.hw_lock->lock, lock.flags );

#if __HAVE_DMA_QUEUE
        if ( lock.context < 0 )
                return -EINVAL;
#elif __HAVE_MULTIPLE_DMA_QUEUES
        if ( lock.context < 0 || lock.context >= dev->queue_count )
                return -EINVAL;
	q = dev->queuelist[lock.context];
#endif

#if __HAVE_DMA_FLUSH
	ret = DRM(flush_block_and_flush)( dev, lock.context, lock.flags );
#endif
        if ( !ret ) {
                add_wait_queue( &dev->lock.lock_queue, &entry );
                for (;;) {
                        current->state = TASK_INTERRUPTIBLE;
                        if ( !dev->lock.hw_lock ) {
                                /* Device has been unregistered */
                                ret = -EINTR;
                                break;
                        }
                        if ( DRM(lock_take)( &dev->lock.hw_lock->lock,
					     lock.context ) ) {
                                dev->lock.pid       = current->pid;
                                dev->lock.lock_time = jiffies;
                                atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
                                break;  /* Got lock */
                        }

                                /* Contention */
                        schedule();
                        if ( signal_pending( current ) ) {
                                ret = -ERESTARTSYS;
                                break;
                        }
                }
                current->state = TASK_RUNNING;
                remove_wait_queue( &dev->lock.lock_queue, &entry );
        }

#if __HAVE_DMA_FLUSH
	DRM(flush_unblock)( dev, lock.context, lock.flags ); /* cleanup phase */
#endif

        if ( !ret ) {
		sigemptyset( &dev->sigmask );
		sigaddset( &dev->sigmask, SIGSTOP );
		sigaddset( &dev->sigmask, SIGTSTP );
		sigaddset( &dev->sigmask, SIGTTIN );
		sigaddset( &dev->sigmask, SIGTTOU );
		dev->sigdata.context = lock.context;
		dev->sigdata.lock    = dev->lock.hw_lock;
		block_all_signals( DRM(notifier),
				   &dev->sigdata, &dev->sigmask );

#if __HAVE_DMA_READY
                if ( lock.flags & _DRM_LOCK_READY ) {
			DRIVER_DMA_READY();
		}
#endif
#if __HAVE_DMA_QUIESCENT
                if ( lock.flags & _DRM_LOCK_QUIESCENT ) {
			DRIVER_DMA_QUIESCENT();
		}
#endif
#if __HAVE_KERNEL_CTX_SWITCH
		if ( dev->last_context != lock.context ) {
			DRM(context_switch)(dev, dev->last_context,
					    lock.context);
		}
#endif
        }

        DRM_DEBUG( "%d %s\n", lock.context, ret ? "interrupted" : "has lock" );

#if __HAVE_DMA_HISTOGRAM
        atomic_inc(&dev->histo.lacq[DRM(histogram_slot)(get_cycles()-start)]);
#endif
        return ret;
}


int DRM(unlock)( 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_lock_t lock;

	if ( copy_from_user( &lock, (drm_lock_t *)arg, sizeof(lock) ) )
		return -EFAULT;

	if ( lock.context == DRM_KERNEL_CONTEXT ) {
		DRM_ERROR( "Process %d using kernel context %d\n",
			   current->pid, lock.context );
		return -EINVAL;
	}

	atomic_inc( &dev->counts[_DRM_STAT_UNLOCKS] );

#if __HAVE_KERNEL_CTX_SWITCH
	/* We no longer really hold it, but if we are the next
	 * agent to request it then we should just be able to
	 * take it immediately and not eat the ioctl.
	 */
	dev->lock.pid = 0;
	{
		__volatile__ unsigned int *plock = &dev->lock.hw_lock->lock;
		unsigned int old, new, prev, ctx;

		ctx = lock.context;
		do {
			old  = *plock;
			new  = ctx;
			prev = cmpxchg(plock, old, new);
		} while (prev != old);
	}
	wake_up_interruptible(&dev->lock.lock_queue);
#else
	DRM(lock_transfer)( dev, &dev->lock.hw_lock->lock,
			    DRM_KERNEL_CONTEXT );
#if __HAVE_DMA_SCHEDULE
	DRM(dma_schedule)( dev, 1 );
#endif

	/* FIXME: Do we ever really need to check this???
	 */
	if ( 1 /* !dev->context_flag */ ) {
		if ( DRM(lock_free)( dev, &dev->lock.hw_lock->lock,
				     DRM_KERNEL_CONTEXT ) ) {
			DRM_ERROR( "\n" );
		}
	}
#endif /* !__HAVE_KERNEL_CTX_SWITCH */

	unblock_all_signals();
	return 0;
}