drm_drv.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 1,062 行 · 第 1/2 页

}

/**
 * Module initialization. Called via init_module at module load time, or via
 * linux/init/main.c (this is not currently supported).
 *
 * \return zero on success or a negative number on failure.
 *
 * Initializes an array of drm_device structures, and attempts to
 * initialize all available devices, using consecutive minors, registering the
 * stubs and initializing the AGP device.
 * 
 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 * after the initialization for driver customization.
 */
static int __init drm_init( void )
{
	struct pci_dev *pdev = NULL;

	DRM_DEBUG( "\n" );

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

	DRM(mem_init)();

	while ((pdev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pdev)) != NULL) {
		DRM(probe)(pdev);
	}
	return 0;
}

/**
 * Called via cleanup_module() at module unload time.
 *
 * Cleans up all DRM device, calling takedown().
 * 
 * \sa drm_init().
 */
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)(dev->minor) ) {
			DRM_ERROR( "Cannot unload module\n" );
		} else {
			DRM_DEBUG("minor %d unregistered\n", dev->minor);
			if (i == 0) {
				DRM_INFO( "Module unloaded\n" );
			}
		}

		DRM(ctxbitmap_cleanup)( dev );

		if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
		    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 );
		}

		DRM(takedown)( dev );

		if (drm_core_has_AGP(dev) && dev->agp ) {
			DRM(agp_uninit)();
			DRM(free)( dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS );
			dev->agp = NULL;
		}

		if (dev->fn_tbl.postcleanup)
		  dev->fn_tbl.postcleanup(dev);

	}
	DRM(numdevs) = 0;
}

module_init( drm_init );
module_exit( drm_cleanup );


/**
 * Get version information
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_version structure.
 * \return zero on success or negative number on failure.
 *
 * Fills in the version information in \p arg.
 */
int DRM(version)( struct inode *inode, struct file *filp,
		  unsigned int cmd, unsigned long arg )
{
	drm_version_t __user *argp = (void __user *)arg;
	drm_version_t version;
	int len;

	if ( copy_from_user( &version, argp, 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( argp, &version, sizeof(version) ) )
		return -EFAULT;
	return 0;
}

/**
 * Open file.
 * 
 * \param inode device inode
 * \param filp file pointer.
 * \return zero on success or a negative number on failure.
 *
 * Searches the DRM device with the same minor number, calls open_helper(), and
 * increments the device open count. If the open count was previous at zero,
 * i.e., it's the first that the device is open, then calls setup().
 */
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 (iminor(inode) == DRM(device)[i].minor) {
			dev = &(DRM(device)[i]);
			break;
		}
	}
	if (!dev) {
		return -ENODEV;
	}

	retcode = DRM(open_helper)( inode, filp, dev );
	if ( !retcode ) {
		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;
}

/**
 * Release file.
 *
 * \param inode device inode
 * \param filp file pointer.
 * \return zero on success or a negative number on failure.
 *
 * If the hardware lock is held then free it, and take it again for the kernel
 * context since it's necessary to reclaim buffers. Unlink the file private
 * data from its list and free it. Decreases the open count and if it reaches
 * zero calls takedown().
 */
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 );

	if (dev->fn_tbl.prerelease)
		dev->fn_tbl.prerelease(dev, filp);

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

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

	if ( priv->lock_count && dev->lock.hw_lock &&
	     _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) &&
	     dev->lock.filp == filp ) {
		DRM_DEBUG( "File %p released, freeing lock for context %d\n",
			filp,
			_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock) );
		
		if (dev->fn_tbl.release)
			dev->fn_tbl.release(dev, filp);

		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. */
	}
	else if ( dev->fn_tbl.release && priv->lock_count && dev->lock.hw_lock ) {
		/* The lock is required to reclaim buffers */
		DECLARE_WAITQUEUE( entry, current );

		add_wait_queue( &dev->lock.lock_queue, &entry );
		for (;;) {
			__set_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.filp	    = filp;
				dev->lock.lock_time = jiffies;
                                atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
				break;	/* Got lock */
			}
				/* Contention */
			schedule();
			if ( signal_pending( current ) ) {
				retcode = -ERESTARTSYS;
				break;
			}
		}
		__set_current_state(TASK_RUNNING);
		remove_wait_queue( &dev->lock.lock_queue, &entry );
		if( !retcode ) {
			if (dev->fn_tbl.release)
				dev->fn_tbl.release(dev, filp);
			DRM(lock_free)( dev, &dev->lock.hw_lock->lock,
					DRM_KERNEL_CONTEXT );
		}
	}
	
	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
	{
		dev->fn_tbl.reclaim_buffers(filp);
	}

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

	down( &dev->ctxlist_sem );
	if ( !list_empty( &dev->ctxlist->head ) ) {
		drm_ctx_list_t *pos, *n;

		list_for_each_entry_safe( pos, n, &dev->ctxlist->head, head ) {
			if ( pos->tag == priv &&
			     pos->handle != DRM_KERNEL_CONTEXT ) {
				if (dev->fn_tbl.context_dtor)
					dev->fn_tbl.context_dtor(dev, pos->handle);

				DRM(ctxbitmap_free)( dev, pos->handle );

				list_del( &pos->head );
				DRM(free)( pos, sizeof(*pos), DRM_MEM_CTXLIST );
				--dev->ctx_count;
			}
		}
	}
	up( &dev->ctxlist_sem );

	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 );
	
	if (dev->fn_tbl.free_filp_priv)
		dev->fn_tbl.free_filp_priv(dev, priv);

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

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

	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;
}

/** 
 * Called whenever a process performs an ioctl on /dev/drm.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or negative number on failure.
 *
 * Looks up the ioctl function in the ::ioctls table, checking for root
 * previleges if so required, and dispatches to the respective function.
 */
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%lx, auth=%d\n",
		   current->pid, cmd, nr, (long)old_encode_dev(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;
}

/** 
 * Lock ioctl.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_lock structure.
 * \return zero on success or negative number on failure.
 *
 * Add the current task to the lock wait queue, and attempt to take to lock.
 */
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;

	++priv->lock_count;

        if ( copy_from_user( &lock, (drm_lock_t __user *)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 (drm_core_check_feature(dev, DRIVER_DMA_QUEUE))
		if ( lock.context < 0 )
			return -EINVAL;

	add_wait_queue( &dev->lock.lock_queue, &entry );
	for (;;) {
		__set_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.filp      = filp;
			dev->lock.lock_time = jiffies;
			atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
			break;  /* Got lock */
		}
		
		/* Contention */
		schedule();
		if ( signal_pending( current ) ) {
			ret = -ERESTARTSYS;
			break;
		}
	}
	__set_current_state(TASK_RUNNING);
	remove_wait_queue( &dev->lock.lock_queue, &entry );

	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 (dev->fn_tbl.dma_ready && (lock.flags & _DRM_LOCK_READY))
		dev->fn_tbl.dma_ready(dev);
	
	if ( dev->fn_tbl.dma_quiescent && (lock.flags & _DRM_LOCK_QUIESCENT ))
		return dev->fn_tbl.dma_quiescent(dev);
	
	/* dev->fn_tbl.kernel_context_switch isn't used by any of the x86 
	 *  drivers but is used by the Sparc driver.
	 */
	
	if (dev->fn_tbl.kernel_context_switch && 
	    dev->last_context != lock.context) {
	  dev->fn_tbl.kernel_context_switch(dev, dev->last_context, 
					    lock.context);
	}
        DRM_DEBUG( "%d %s\n", lock.context, ret ? "interrupted" : "has lock" );

        return ret;
}

/** 
 * Unlock ioctl.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_lock structure.
 * \return zero on success or negative number on failure.
 *
 * Transfer and free the lock.
 */
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 __user *)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] );

	/* kernel_context_switch isn't used by any of the x86 drm
	 * modules but is required by the Sparc driver.
	 */
	if (dev->fn_tbl.kernel_context_switch_unlock)
		dev->fn_tbl.kernel_context_switch_unlock(dev, &lock);
	else {
		DRM(lock_transfer)( dev, &dev->lock.hw_lock->lock, 
				    DRM_KERNEL_CONTEXT );
		
		if ( DRM(lock_free)( dev, &dev->lock.hw_lock->lock,
				     DRM_KERNEL_CONTEXT ) ) {
			DRM_ERROR( "\n" );
		}
	}

	unblock_all_signals();
	return 0;
}