[deliverable/linux.git] / drivers / char / drm / drm_fops.c

/**
 * \file drm_fops.c
 * File operations for DRM
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Daryll Strauss <daryll@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
 *
 * Copyright 1999 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.
 */

#include "drmP.h"
#include <linux/poll.h>

static int drm_open_helper(struct inode *inode, struct file *filp,
			   drm_device_t * dev);

static int drm_setup(drm_device_t * dev)
{
	int i;
	int ret;

	if (dev->driver->firstopen) {
		ret = dev->driver->firstopen(dev);
		if (ret != 0)
			return ret;
	}

	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_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.
	 */

	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 < drm_cards_limit)))
		return -ENODEV;

	if (!drm_heads[minor])
		return -ENODEV;

	if (!(dev = drm_heads[minor]->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);

/**
 * 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 drm_lastclose().
 */
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->head->dev;

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

	if (dev->driver->preclose)
		dev->driver->preclose(dev, filp);

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

	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
		  current->pid, (long)old_encode_dev(priv->head->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->driver->reclaim_buffers_locked)
			dev->driver->reclaim_buffers_locked(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->driver->reclaim_buffers_locked && 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) {
			dev->driver->reclaim_buffers_locked(dev, filp);
			drm_lock_free(dev, &dev->lock.hw_lock->lock,
				      DRM_KERNEL_CONTEXT);
		}
	}

	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
	    !dev->driver->reclaim_buffers_locked) {
		dev->driver->reclaim_buffers(dev, filp);
	}

	drm_fasync(-1, filp, 0);

	down(&dev->ctxlist_sem);
	if (dev->ctxlist && (!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->driver->context_dtor)
					dev->driver->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->driver->postclose)
		dev->driver->postclose(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_lastclose(dev);
	}
	spin_unlock(&dev->count_lock);

	unlock_kernel();

	return retcode;
}

EXPORT_SYMBOL(drm_release);

/**
 * Called whenever a process opens /dev/drm.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param dev device.
 * \return zero on success or a negative number on failure.
 *
 * Creates and initializes a drm_file structure for the file private data in \p
 * filp and add it into the double linked list in \p dev.
 */
static int drm_open_helper(struct inode *inode, struct file *filp,
			   drm_device_t * dev)
{
	int minor = iminor(inode);
	drm_file_t *priv;
	int ret;

	if (filp->f_flags & O_EXCL)
		return -EBUSY;	/* No exclusive opens */
	if (!drm_cpu_valid())
		return -EINVAL;

	DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);

	priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
	if (!priv)
		return -ENOMEM;

	memset(priv, 0, sizeof(*priv));
	filp->private_data = priv;
	priv->uid = current->euid;
	priv->pid = current->pid;
	priv->minor = minor;
	priv->head = drm_heads[minor];
	priv->ioctl_count = 0;
	priv->authenticated = capable(CAP_SYS_ADMIN);
	priv->lock_count = 0;

	if (dev->driver->open) {
		ret = dev->driver->open(dev, priv);
		if (ret < 0)
			goto out_free;
	}

	down(&dev->struct_sem);
	if (!dev->file_last) {
		priv->next = NULL;
		priv->prev = NULL;
		dev->file_first = priv;
		dev->file_last = priv;
	} else {
		priv->next = NULL;
		priv->prev = dev->file_last;
		dev->file_last->next = priv;
		dev->file_last = priv;
	}
	up(&dev->struct_sem);

#ifdef __alpha__
	/*
	 * Default the hose
	 */
	if (!dev->hose) {
		struct pci_dev *pci_dev;
		pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
		if (pci_dev) {
			dev->hose = pci_dev->sysdata;
			pci_dev_put(pci_dev);
		}
		if (!dev->hose) {
			struct pci_bus *b = pci_bus_b(pci_root_buses.next);
			if (b)
				dev->hose = b->sysdata;
		}
	}
#endif

	return 0;
      out_free:
	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
	filp->private_data = NULL;
	return ret;
}

/** No-op. */
int drm_flush(struct file *filp)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;

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

EXPORT_SYMBOL(drm_flush);

/** No-op. */
int drm_fasync(int fd, struct file *filp, int on)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	int retcode;

	DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
		  (long)old_encode_dev(priv->head->device));
	retcode = fasync_helper(fd, filp, on, &dev->buf_async);
	if (retcode < 0)
		return retcode;
	return 0;
}

EXPORT_SYMBOL(drm_fasync);

/** No-op. */
unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
{
	return 0;
}

EXPORT_SYMBOL(drm_poll);
Commit	Line	Data
1da177e4	1	/**
b5e89ed5	2	* \file drm_fops.c
1da177e4	3	* File operations for DRM
b5e89ed5	4	*
1da177e4 LT	5	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	6	* \author Daryll Strauss <daryll@valinux.com>
	7	* \author Gareth Hughes <gareth@valinux.com>
	8	*/
	9
	10	/*
	11	* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
	12	*
	13	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	14	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	15	* All Rights Reserved.
	16	*
	17	* Permission is hereby granted, free of charge, to any person obtaining a
	18	* copy of this software and associated documentation files (the "Software"),
	19	* to deal in the Software without restriction, including without limitation
	20	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	21	* and/or sell copies of the Software, and to permit persons to whom the
	22	* Software is furnished to do so, subject to the following conditions:
	23	*
	24	* The above copyright notice and this permission notice (including the next
	25	* paragraph) shall be included in all copies or substantial portions of the
	26	* Software.
	27	*
	28	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	29	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	30	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	31	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	32	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	33	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	34	* OTHER DEALINGS IN THE SOFTWARE.
	35	*/
	36
	37	#include "drmP.h"
	38	#include <linux/poll.h>
	39
b5e89ed5 DA	40	static int drm_open_helper(struct inode inode, struct file filp,
b5e89ed5 DA	41	drm_device_t * dev);
c94f7029	42
b5e89ed5	43	static int drm_setup(drm_device_t * dev)
1da177e4 LT	44	{
	45	int i;
	46	int ret;
	47
22eae947 DA	48	if (dev->driver->firstopen) {
22eae947 DA	49	ret = dev->driver->firstopen(dev);
b5e89ed5	50	if (ret != 0)
1da177e4 LT	51	return ret;
	52	}
	53
b5e89ed5 DA	54	atomic_set(&dev->ioctl_count, 0);
b5e89ed5 DA	55	atomic_set(&dev->vma_count, 0);
1da177e4	56	dev->buf_use = 0;
b5e89ed5	57	atomic_set(&dev->buf_alloc, 0);
1da177e4	58
b5e89ed5 DA	59	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
	60	i = drm_dma_setup(dev);
	61	if (i < 0)
1da177e4 LT	62	return i;
	63	}
	64
b5e89ed5 DA	65	for (i = 0; i < DRM_ARRAY_SIZE(dev->counts); i++)
b5e89ed5 DA	66	atomic_set(&dev->counts[i], 0);
1da177e4	67
b5e89ed5	68	for (i = 0; i < DRM_HASH_SIZE; i++) {
1da177e4 LT	69	dev->magiclist[i].head = NULL;
	70	dev->magiclist[i].tail = NULL;
	71	}
	72
b5e89ed5 DA	73	dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST);
	74	if (dev->ctxlist == NULL)
	75	return -ENOMEM;
1da177e4 LT	76	memset(dev->ctxlist, 0, sizeof(*dev->ctxlist));
	77	INIT_LIST_HEAD(&dev->ctxlist->head);
	78
	79	dev->vmalist = NULL;
	80	dev->sigdata.lock = dev->lock.hw_lock = NULL;
b5e89ed5	81	init_waitqueue_head(&dev->lock.lock_queue);
1da177e4 LT	82	dev->queue_count = 0;
	83	dev->queue_reserved = 0;
	84	dev->queue_slots = 0;
	85	dev->queuelist = NULL;
	86	dev->irq_enabled = 0;
	87	dev->context_flag = 0;
	88	dev->interrupt_flag = 0;
	89	dev->dma_flag = 0;
	90	dev->last_context = 0;
	91	dev->last_switch = 0;
	92	dev->last_checked = 0;
b5e89ed5	93	init_waitqueue_head(&dev->context_wait);
1da177e4 LT	94	dev->if_version = 0;
	95
	96	dev->ctx_start = 0;
	97	dev->lck_start = 0;
	98
1da177e4	99	dev->buf_async = NULL;
b5e89ed5 DA	100	init_waitqueue_head(&dev->buf_readers);
b5e89ed5 DA	101	init_waitqueue_head(&dev->buf_writers);
1da177e4	102
b5e89ed5	103	DRM_DEBUG("\n");
1da177e4 LT	104
	105	/*
	106	* The kernel's context could be created here, but is now created
b5e89ed5	107	* in drm_dma_enqueue. This is more resource-efficient for
1da177e4 LT	108	* hardware that does not do DMA, but may mean that
	109	* drm_select_queue fails between the time the interrupt is
	110	* initialized and the time the queues are initialized.
	111	*/
1da177e4 LT	112
	113	return 0;
	114	}
	115
	116	/**
	117	* Open file.
b5e89ed5	118	*
1da177e4 LT	119	* \param inode device inode
	120	* \param filp file pointer.
	121	* \return zero on success or a negative number on failure.
	122	*
	123	* Searches the DRM device with the same minor number, calls open_helper(), and
	124	* increments the device open count. If the open count was previous at zero,
	125	* i.e., it's the first that the device is open, then calls setup().
	126	*/
b5e89ed5	127	int drm_open(struct inode inode, struct file filp)
1da177e4 LT	128	{
	129	drm_device_t *dev = NULL;
	130	int minor = iminor(inode);
	131	int retcode = 0;
	132
	133	if (!((minor >= 0) && (minor < drm_cards_limit)))
	134	return -ENODEV;
b5e89ed5	135
1da177e4 LT	136	if (!drm_heads[minor])
	137	return -ENODEV;
	138
	139	if (!(dev = drm_heads[minor]->dev))
	140	return -ENODEV;
b5e89ed5 DA	141
	142	retcode = drm_open_helper(inode, filp, dev);
	143	if (!retcode) {
	144	atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
	145	spin_lock(&dev->count_lock);
	146	if (!dev->open_count++) {
	147	spin_unlock(&dev->count_lock);
	148	return drm_setup(dev);
1da177e4	149	}
b5e89ed5	150	spin_unlock(&dev->count_lock);
1da177e4 LT	151	}
	152
	153	return retcode;
	154	}
b5e89ed5	155
1da177e4 LT	156	EXPORT_SYMBOL(drm_open);
	157
	158	/**
	159	* Release file.
	160	*
	161	* \param inode device inode
	162	* \param filp file pointer.
	163	* \return zero on success or a negative number on failure.
	164	*
	165	* If the hardware lock is held then free it, and take it again for the kernel
	166	* context since it's necessary to reclaim buffers. Unlink the file private
	167	* data from its list and free it. Decreases the open count and if it reaches
22eae947	168	* zero calls drm_lastclose().
1da177e4	169	*/
b5e89ed5	170	int drm_release(struct inode inode, struct file filp)
1da177e4 LT	171	{
	172	drm_file_t *priv = filp->private_data;
	173	drm_device_t *dev;
	174	int retcode = 0;
	175
	176	lock_kernel();
	177	dev = priv->head->dev;
	178
b5e89ed5	179	DRM_DEBUG("open_count = %d\n", dev->open_count);
1da177e4	180
22eae947 DA	181	if (dev->driver->preclose)
22eae947 DA	182	dev->driver->preclose(dev, filp);
1da177e4 LT	183
	184	/* ========================================================
	185	* Begin inline drm_release
	186	*/
	187
b5e89ed5 DA	188	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
	189	current->pid, (long)old_encode_dev(priv->head->device),
	190	dev->open_count);
	191
	192	if (priv->lock_count && dev->lock.hw_lock &&
	193	_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) &&
	194	dev->lock.filp == filp) {
	195	DRM_DEBUG("File %p released, freeing lock for context %d\n",
	196	filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
1da177e4	197
22eae947 DA	198	if (dev->driver->reclaim_buffers_locked)
22eae947 DA	199	dev->driver->reclaim_buffers_locked(dev, filp);
1da177e4	200
b5e89ed5 DA	201	drm_lock_free(dev, &dev->lock.hw_lock->lock,
b5e89ed5 DA	202	_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
1da177e4	203
b5e89ed5 DA	204	/* FIXME: may require heavy-handed reset of
	205	hardware at this point, possibly
	206	processed via a callback to the X
	207	server. */
22eae947	208	} else if (dev->driver->reclaim_buffers_locked && priv->lock_count
b5e89ed5	209	&& dev->lock.hw_lock) {
1da177e4	210	/* The lock is required to reclaim buffers */
b5e89ed5	211	DECLARE_WAITQUEUE(entry, current);
1da177e4	212
b5e89ed5	213	add_wait_queue(&dev->lock.lock_queue, &entry);
1da177e4 LT	214	for (;;) {
1da177e4 LT	215	__set_current_state(TASK_INTERRUPTIBLE);
b5e89ed5	216	if (!dev->lock.hw_lock) {
1da177e4 LT	217	/* Device has been unregistered */
	218	retcode = -EINTR;
	219	break;
	220	}
b5e89ed5 DA	221	if (drm_lock_take(&dev->lock.hw_lock->lock,
	222	DRM_KERNEL_CONTEXT)) {
	223	dev->lock.filp = filp;
1da177e4	224	dev->lock.lock_time = jiffies;
b5e89ed5	225	atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
1da177e4 LT	226	break; /* Got lock */
1da177e4 LT	227	}
b5e89ed5	228	/* Contention */
1da177e4	229	schedule();
b5e89ed5	230	if (signal_pending(current)) {
1da177e4 LT	231	retcode = -ERESTARTSYS;
	232	break;
	233	}
	234	}
	235	__set_current_state(TASK_RUNNING);
b5e89ed5 DA	236	remove_wait_queue(&dev->lock.lock_queue, &entry);
b5e89ed5 DA	237	if (!retcode) {
22eae947	238	dev->driver->reclaim_buffers_locked(dev, filp);
b5e89ed5 DA	239	drm_lock_free(dev, &dev->lock.hw_lock->lock,
b5e89ed5 DA	240	DRM_KERNEL_CONTEXT);
1da177e4 LT	241	}
1da177e4 LT	242	}
b5e89ed5	243
22eae947 DA	244	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
22eae947 DA	245	!dev->driver->reclaim_buffers_locked) {
1da177e4 LT	246	dev->driver->reclaim_buffers(dev, filp);
	247	}
	248
b5e89ed5	249	drm_fasync(-1, filp, 0);
1da177e4	250
b5e89ed5 DA	251	down(&dev->ctxlist_sem);
b5e89ed5 DA	252	if (dev->ctxlist && (!list_empty(&dev->ctxlist->head))) {
1da177e4 LT	253	drm_ctx_list_t pos, n;
1da177e4 LT	254
b5e89ed5 DA	255	list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) {
	256	if (pos->tag == priv &&
	257	pos->handle != DRM_KERNEL_CONTEXT) {
1da177e4	258	if (dev->driver->context_dtor)
b5e89ed5 DA	259	dev->driver->context_dtor(dev,
b5e89ed5 DA	260	pos->handle);
1da177e4	261
b5e89ed5	262	drm_ctxbitmap_free(dev, pos->handle);
1da177e4	263
b5e89ed5 DA	264	list_del(&pos->head);
b5e89ed5 DA	265	drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
1da177e4 LT	266	--dev->ctx_count;
	267	}
	268	}
	269	}
b5e89ed5	270	up(&dev->ctxlist_sem);
1da177e4	271
b5e89ed5 DA	272	down(&dev->struct_sem);
b5e89ed5 DA	273	if (priv->remove_auth_on_close == 1) {
1da177e4	274	drm_file_t *temp = dev->file_first;
b5e89ed5	275	while (temp) {
1da177e4 LT	276	temp->authenticated = 0;
	277	temp = temp->next;
	278	}
	279	}
b5e89ed5	280	if (priv->prev) {
1da177e4 LT	281	priv->prev->next = priv->next;
1da177e4 LT	282	} else {
b5e89ed5	283	dev->file_first = priv->next;
1da177e4	284	}
b5e89ed5	285	if (priv->next) {
1da177e4 LT	286	priv->next->prev = priv->prev;
1da177e4 LT	287	} else {
b5e89ed5	288	dev->file_last = priv->prev;
1da177e4	289	}
b5e89ed5 DA	290	up(&dev->struct_sem);
b5e89ed5 DA	291
22eae947 DA	292	if (dev->driver->postclose)
22eae947 DA	293	dev->driver->postclose(dev, priv);
1da177e4	294
b5e89ed5	295	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
1da177e4 LT	296
	297	/* ========================================================
	298	* End inline drm_release
	299	*/
	300
b5e89ed5 DA	301	atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
	302	spin_lock(&dev->count_lock);
	303	if (!--dev->open_count) {
	304	if (atomic_read(&dev->ioctl_count) \|\| dev->blocked) {
	305	DRM_ERROR("Device busy: %d %d\n",
	306	atomic_read(&dev->ioctl_count), dev->blocked);
	307	spin_unlock(&dev->count_lock);
1da177e4 LT	308	unlock_kernel();
	309	return -EBUSY;
	310	}
b5e89ed5	311	spin_unlock(&dev->count_lock);
1da177e4	312	unlock_kernel();
22eae947	313	return drm_lastclose(dev);
1da177e4	314	}
b5e89ed5	315	spin_unlock(&dev->count_lock);
1da177e4 LT	316
	317	unlock_kernel();
	318
	319	return retcode;
	320	}
b5e89ed5	321
1da177e4 LT	322	EXPORT_SYMBOL(drm_release);
	323
	324	/**
b5e89ed5	325	* Called whenever a process opens /dev/drm.
1da177e4 LT	326	*
	327	* \param inode device inode.
	328	* \param filp file pointer.
	329	* \param dev device.
	330	* \return zero on success or a negative number on failure.
b5e89ed5	331	*
1da177e4 LT	332	* Creates and initializes a drm_file structure for the file private data in \p
	333	* filp and add it into the double linked list in \p dev.
	334	*/
b5e89ed5 DA	335	static int drm_open_helper(struct inode inode, struct file filp,
b5e89ed5 DA	336	drm_device_t * dev)
1da177e4	337	{
b5e89ed5 DA	338	int minor = iminor(inode);
b5e89ed5 DA	339	drm_file_t *priv;
1da177e4 LT	340	int ret;
1da177e4 LT	341
b5e89ed5 DA	342	if (filp->f_flags & O_EXCL)
	343	return -EBUSY; /* No exclusive opens */
	344	if (!drm_cpu_valid())
	345	return -EINVAL;
1da177e4 LT	346
	347	DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
	348
b5e89ed5 DA	349	priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
	350	if (!priv)
	351	return -ENOMEM;
1da177e4 LT	352
1da177e4 LT	353	memset(priv, 0, sizeof(*priv));
b5e89ed5 DA	354	filp->private_data = priv;
	355	priv->uid = current->euid;
	356	priv->pid = current->pid;
	357	priv->minor = minor;
	358	priv->head = drm_heads[minor];
	359	priv->ioctl_count = 0;
1da177e4	360	priv->authenticated = capable(CAP_SYS_ADMIN);
b5e89ed5	361	priv->lock_count = 0;
1da177e4	362
22eae947 DA	363	if (dev->driver->open) {
22eae947 DA	364	ret = dev->driver->open(dev, priv);
1da177e4 LT	365	if (ret < 0)
	366	goto out_free;
	367	}
	368
	369	down(&dev->struct_sem);
	370	if (!dev->file_last) {
b5e89ed5 DA	371	priv->next = NULL;
b5e89ed5 DA	372	priv->prev = NULL;
1da177e4	373	dev->file_first = priv;
b5e89ed5	374	dev->file_last = priv;
1da177e4	375	} else {
b5e89ed5 DA	376	priv->next = NULL;
b5e89ed5 DA	377	priv->prev = dev->file_last;
1da177e4	378	dev->file_last->next = priv;
b5e89ed5	379	dev->file_last = priv;
1da177e4 LT	380	}
	381	up(&dev->struct_sem);
	382
	383	#ifdef __alpha__
	384	/*
	385	* Default the hose
	386	*/
	387	if (!dev->hose) {
	388	struct pci_dev *pci_dev;
	389	pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
	390	if (pci_dev) {
	391	dev->hose = pci_dev->sysdata;
	392	pci_dev_put(pci_dev);
	393	}
	394	if (!dev->hose) {
	395	struct pci_bus *b = pci_bus_b(pci_root_buses.next);
b5e89ed5 DA	396	if (b)
b5e89ed5 DA	397	dev->hose = b->sysdata;
1da177e4 LT	398	}
	399	}
	400	#endif
	401
	402	return 0;
b5e89ed5	403	out_free:
1da177e4	404	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
b5e89ed5	405	filp->private_data = NULL;
1da177e4 LT	406	return ret;
	407	}
	408
	409	/** No-op. */
	410	int drm_flush(struct file *filp)
	411	{
b5e89ed5 DA	412	drm_file_t *priv = filp->private_data;
b5e89ed5 DA	413	drm_device_t *dev = priv->head->dev;
1da177e4 LT	414
1da177e4 LT	415	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
b5e89ed5 DA	416	current->pid, (long)old_encode_dev(priv->head->device),
b5e89ed5 DA	417	dev->open_count);
1da177e4 LT	418	return 0;
1da177e4 LT	419	}
b5e89ed5	420
1da177e4 LT	421	EXPORT_SYMBOL(drm_flush);
	422
	423	/** No-op. */
	424	int drm_fasync(int fd, struct file *filp, int on)
	425	{
b5e89ed5 DA	426	drm_file_t *priv = filp->private_data;
	427	drm_device_t *dev = priv->head->dev;
	428	int retcode;
1da177e4	429
b5e89ed5 DA	430	DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
b5e89ed5 DA	431	(long)old_encode_dev(priv->head->device));
1da177e4	432	retcode = fasync_helper(fd, filp, on, &dev->buf_async);
b5e89ed5 DA	433	if (retcode < 0)
b5e89ed5 DA	434	return retcode;
1da177e4 LT	435	return 0;
1da177e4 LT	436	}
b5e89ed5	437
1da177e4 LT	438	EXPORT_SYMBOL(drm_fasync);
	439
	440	/** No-op. */
	441	unsigned int drm_poll(struct file filp, struct poll_table_struct wait)
	442	{
	443	return 0;
	444	}
1da177e4	445
b5e89ed5	446	EXPORT_SYMBOL(drm_poll);