1 files changed, 315 insertions, 0 deletions

diff --git a/linux-core/drm_fops.c b/linux-core/drm_fops.c
index 0ee303df..fea01130 100644
--- a/linux-core/drm_fops.c
+++ b/linux-core/drm_fops.c
@@ -37,6 +37,156 @@
 #include "drmP.h"
 #include <linux/poll.h>
 
+static int drm_setup( drm_device_t *dev )
+{
+	int i;
+
+	if (dev->fn_tbl->presetup)
+		dev->fn_tbl->presetup(dev);
+
+	atomic_set( &dev->ioctl_count, 0 );
+	atomic_set( &dev->vma_count, 0 );
+	dev->buf_use = 0;
+	atomic_set( &dev->buf_alloc, 0 );
+
+	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
+	{
+		i = drm_dma_setup( dev );
+		if ( i < 0 )
+			return i;
+	}
+	
+	for ( i = 0 ; i < DRM_ARRAY_SIZE(dev->counts) ; i++ )
+		atomic_set( &dev->counts[i], 0 );
+
+	for ( i = 0 ; i < DRM_HASH_SIZE ; i++ ) {
+		dev->magiclist[i].head = NULL;
+		dev->magiclist[i].tail = NULL;
+	}
+
+	dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist),
+				  DRM_MEM_CTXLIST);
+	if(dev->ctxlist == NULL) return -ENOMEM;
+	memset(dev->ctxlist, 0, sizeof(*dev->ctxlist));
+	INIT_LIST_HEAD(&dev->ctxlist->head);
+
+	dev->vmalist = NULL;
+	dev->sigdata.lock = dev->lock.hw_lock = NULL;
+	init_waitqueue_head( &dev->lock.lock_queue );
+	dev->queue_count = 0;
+	dev->queue_reserved = 0;
+	dev->queue_slots = 0;
+	dev->queuelist = NULL;
+	dev->irq_enabled = 0;
+	dev->context_flag = 0;
+	dev->interrupt_flag = 0;
+	dev->dma_flag = 0;
+	dev->last_context = 0;
+	dev->last_switch = 0;
+	dev->last_checked = 0;
+	init_waitqueue_head( &dev->context_wait );
+	dev->if_version = 0;
+
+	dev->ctx_start = 0;
+	dev->lck_start = 0;
+
+	dev->buf_rp = dev->buf;
+	dev->buf_wp = dev->buf;
+	dev->buf_end = dev->buf + DRM_BSZ;
+	dev->buf_async = NULL;
+	init_waitqueue_head( &dev->buf_readers );
+	init_waitqueue_head( &dev->buf_writers );
+
+	DRM_DEBUG( "\n" );
+
+	/*
+	 * The kernel's context could be created here, but is now created
+	 * in drm_dma_enqueue.	This is more resource-efficient for
+	 * hardware that does not do DMA, but may mean that
+	 * drm_select_queue fails between the time the interrupt is
+	 * initialized and the time the queues are initialized.
+	 */
+	if (dev->fn_tbl->postsetup)
+		dev->fn_tbl->postsetup(dev);
+
+	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 minor = iminor(inode);
+	int retcode = 0;
+
+	if (!((minor >= 0) && (minor < cards_limit)))
+		return -ENODEV;
+		
+	dev = drm_minors[minor].dev;
+	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;
+}
+EXPORT_SYMBOL(drm_open);
+
+/**
+ * File \c open operation.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ *
+ * Puts the dev->fops corresponding to the device minor number into
+ * \p filp, call the \c open method, and restore the file operations.
+ */
+int drm_stub_open(struct inode *inode, struct file *filp)
+{
+	drm_device_t *dev = NULL;
+	int minor = iminor(inode);
+	int err = -ENODEV;
+	struct file_operations *old_fops;
+	
+	DRM_DEBUG("\n");
+
+	if (!((minor >= 0) && (minor < cards_limit)))
+		return -ENODEV;
+
+	dev = drm_minors[minor].dev;
+	if (!dev)
+		return -ENODEV;
+
+	old_fops = filp->f_op;
+	filp->f_op = fops_get(&dev->fn_tbl->fops);
+	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
+		fops_put(filp->f_op);
+		filp->f_op = fops_get(old_fops);
+	}
+	fops_put(old_fops);
+
+	return err;
+}
 
 /**
  * Called whenever a process opens /dev/drm. 
@@ -128,3 +278,168 @@ int drm_fasync(int fd, struct file *filp, int on)
 	return 0;
 }
 EXPORT_SYMBOL(drm_fasync);
+
+/**
+ * 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 (;;) {
+			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;
+			}
+		}
+		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;
+}
+EXPORT_SYMBOL(drm_release);