[net-next-2.6.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 "drm_sarea.h"
#include <linux/poll.h>

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

static int drm_setup(struct drm_device * dev)
{
	drm_local_map_t *map;
	int i;
	int ret;
	u32 sareapage;

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

	dev->magicfree.next = NULL;

	/* prebuild the SAREA */
	sareapage = max_t(unsigned, SAREA_MAX, PAGE_SIZE);
	i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map);
	if (i != 0)
		return i;

	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 < ARRAY_SIZE(dev->counts); i++)
		atomic_set(&dev->counts[i], 0);

	drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
	INIT_LIST_HEAD(&dev->magicfree);

	dev->sigdata.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)
{
	struct drm_device *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);

/**
 * 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)
{
	struct drm_device *dev = NULL;
	int minor = iminor(inode);
	int err = -ENODEV;
	const struct file_operations *old_fops;

	DRM_DEBUG("\n");

	if (!((minor >= 0) && (minor < drm_cards_limit)))
		return -ENODEV;

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

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

	old_fops = filp->f_op;
	filp->f_op = fops_get(&dev->driver->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;
}

/**
 * Check whether DRI will run on this CPU.
 *
 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
 */
static int drm_cpu_valid(void)
{
#if defined(__i386__)
	if (boot_cpu_data.x86 == 3)
		return 0;	/* No cmpxchg on a 386 */
#endif
#if defined(__sparc__) && !defined(__sparc_v9__)
	return 0;		/* No cmpxchg before v9 sparc. */
#endif
	return 1;
}

/**
 * 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,
			   struct drm_device * dev)
{
	int minor = iminor(inode);
	struct drm_file *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;
	/* for compatibility root is always authenticated */
	priv->authenticated = capable(CAP_SYS_ADMIN);
	priv->lock_count = 0;

	INIT_LIST_HEAD(&priv->lhead);

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

	mutex_lock(&dev->struct_mutex);
	if (list_empty(&dev->filelist))
		priv->master = 1;

	list_add(&priv->lhead, &dev->filelist);
	mutex_unlock(&dev->struct_mutex);

#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_fasync(int fd, struct file *filp, int on)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *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);

/**
 * 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)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *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 (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) {
		if (drm_i_have_hw_lock(filp)) {
			dev->driver->reclaim_buffers_locked(dev, filp);
		} else {
			unsigned long _end=jiffies + 3*DRM_HZ;
			int locked = 0;

			drm_idlelock_take(&dev->lock);

			/*
			 * Wait for a while.
			 */

			do{
				spin_lock(&dev->lock.spinlock);
				locked = dev->lock.idle_has_lock;
				spin_unlock(&dev->lock.spinlock);
				if (locked)
					break;
				schedule();
			} while (!time_after_eq(jiffies, _end));

			if (!locked) {
				DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
					  "\tdriver to use reclaim_buffers_idlelocked() instead.\n"
					  "\tI will go on reclaiming the buffers anyway.\n");
			}

			dev->driver->reclaim_buffers_locked(dev, filp);
			drm_idlelock_release(&dev->lock);
		}
	}

	if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) {

		drm_idlelock_take(&dev->lock);
		dev->driver->reclaim_buffers_idlelocked(dev, filp);
		drm_idlelock_release(&dev->lock);

	}

	if (drm_i_have_hw_lock(filp)) {
		DRM_DEBUG("File %p released, freeing lock for context %d\n",
			  filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));

		drm_lock_free(&dev->lock,
			      _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
	}


	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);

	mutex_lock(&dev->ctxlist_mutex);
	if (!list_empty(&dev->ctxlist)) {
		struct drm_ctx_list *pos, *n;

		list_for_each_entry_safe(pos, n, &dev->ctxlist, 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;
			}
		}
	}
	mutex_unlock(&dev->ctxlist_mutex);

	mutex_lock(&dev->struct_mutex);
	if (priv->remove_auth_on_close == 1) {
		struct drm_file *temp;

		list_for_each_entry(temp, &dev->filelist, lhead)
			temp->authenticated = 0;
	}
	list_del(&priv->lhead);
	mutex_unlock(&dev->struct_mutex);

	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);

/** 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"
d985c108	38	#include "drm_sarea.h"
1da177e4 LT	39	#include <linux/poll.h>
1da177e4 LT	40
b5e89ed5	41	static int drm_open_helper(struct inode inode, struct file filp,
84b1fd10	42	struct drm_device * dev);
c94f7029	43
84b1fd10	44	static int drm_setup(struct drm_device * dev)
1da177e4	45	{
d985c108	46	drm_local_map_t *map;
1da177e4 LT	47	int i;
1da177e4 LT	48	int ret;
11d9c2fd	49	u32 sareapage;
1da177e4	50
22eae947 DA	51	if (dev->driver->firstopen) {
22eae947 DA	52	ret = dev->driver->firstopen(dev);
b5e89ed5	53	if (ret != 0)
1da177e4 LT	54	return ret;
	55	}
	56
1f4eccfd TH	57	dev->magicfree.next = NULL;
1f4eccfd TH	58
d985c108	59	/* prebuild the SAREA */
4b560fde	60	sareapage = max_t(unsigned, SAREA_MAX, PAGE_SIZE);
11d9c2fd	61	i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map);
d985c108 DA	62	if (i != 0)
	63	return i;
	64
b5e89ed5 DA	65	atomic_set(&dev->ioctl_count, 0);
b5e89ed5 DA	66	atomic_set(&dev->vma_count, 0);
1da177e4	67	dev->buf_use = 0;
b5e89ed5	68	atomic_set(&dev->buf_alloc, 0);
1da177e4	69
b5e89ed5 DA	70	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
	71	i = drm_dma_setup(dev);
	72	if (i < 0)
1da177e4 LT	73	return i;
	74	}
	75
3d77461e	76	for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
b5e89ed5	77	atomic_set(&dev->counts[i], 0);
1da177e4	78
8669cbc5 TH	79	drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
8669cbc5 TH	80	INIT_LIST_HEAD(&dev->magicfree);
1da177e4	81
11d9c2fd	82	dev->sigdata.lock = NULL;
b5e89ed5	83	init_waitqueue_head(&dev->lock.lock_queue);
1da177e4 LT	84	dev->queue_count = 0;
	85	dev->queue_reserved = 0;
	86	dev->queue_slots = 0;
	87	dev->queuelist = NULL;
	88	dev->irq_enabled = 0;
	89	dev->context_flag = 0;
	90	dev->interrupt_flag = 0;
	91	dev->dma_flag = 0;
	92	dev->last_context = 0;
	93	dev->last_switch = 0;
	94	dev->last_checked = 0;
b5e89ed5	95	init_waitqueue_head(&dev->context_wait);
1da177e4 LT	96	dev->if_version = 0;
	97
	98	dev->ctx_start = 0;
	99	dev->lck_start = 0;
	100
1da177e4	101	dev->buf_async = NULL;
b5e89ed5 DA	102	init_waitqueue_head(&dev->buf_readers);
b5e89ed5 DA	103	init_waitqueue_head(&dev->buf_writers);
1da177e4	104
b5e89ed5	105	DRM_DEBUG("\n");
1da177e4 LT	106
	107	/*
	108	* The kernel's context could be created here, but is now created
b5e89ed5	109	* in drm_dma_enqueue. This is more resource-efficient for
1da177e4 LT	110	* hardware that does not do DMA, but may mean that
	111	* drm_select_queue fails between the time the interrupt is
	112	* initialized and the time the queues are initialized.
	113	*/
1da177e4 LT	114
	115	return 0;
	116	}
	117
	118	/**
	119	* Open file.
b5e89ed5	120	*
1da177e4 LT	121	* \param inode device inode
	122	* \param filp file pointer.
	123	* \return zero on success or a negative number on failure.
	124	*
	125	* Searches the DRM device with the same minor number, calls open_helper(), and
	126	* increments the device open count. If the open count was previous at zero,
	127	* i.e., it's the first that the device is open, then calls setup().
	128	*/
b5e89ed5	129	int drm_open(struct inode inode, struct file filp)
1da177e4	130	{
84b1fd10	131	struct drm_device *dev = NULL;
1da177e4 LT	132	int minor = iminor(inode);
	133	int retcode = 0;
	134
	135	if (!((minor >= 0) && (minor < drm_cards_limit)))
	136	return -ENODEV;
b5e89ed5	137
1da177e4 LT	138	if (!drm_heads[minor])
	139	return -ENODEV;
	140
	141	if (!(dev = drm_heads[minor]->dev))
	142	return -ENODEV;
b5e89ed5 DA	143
	144	retcode = drm_open_helper(inode, filp, dev);
	145	if (!retcode) {
	146	atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
	147	spin_lock(&dev->count_lock);
	148	if (!dev->open_count++) {
	149	spin_unlock(&dev->count_lock);
	150	return drm_setup(dev);
1da177e4	151	}
b5e89ed5	152	spin_unlock(&dev->count_lock);
1da177e4 LT	153	}
	154
	155	return retcode;
	156	}
	157	EXPORT_SYMBOL(drm_open);
	158
d985c108 DA	159	/**
	160	* File \c open operation.
	161	*
	162	* \param inode device inode.
	163	* \param filp file pointer.
	164	*
	165	* Puts the dev->fops corresponding to the device minor number into
	166	* \p filp, call the \c open method, and restore the file operations.
	167	*/
	168	int drm_stub_open(struct inode inode, struct file filp)
	169	{
84b1fd10	170	struct drm_device *dev = NULL;
d985c108 DA	171	int minor = iminor(inode);
d985c108 DA	172	int err = -ENODEV;
99ac48f5	173	const struct file_operations *old_fops;
d985c108 DA	174
	175	DRM_DEBUG("\n");
	176
	177	if (!((minor >= 0) && (minor < drm_cards_limit)))
	178	return -ENODEV;
	179
	180	if (!drm_heads[minor])
	181	return -ENODEV;
	182
	183	if (!(dev = drm_heads[minor]->dev))
	184	return -ENODEV;
	185
	186	old_fops = filp->f_op;
	187	filp->f_op = fops_get(&dev->driver->fops);
	188	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
	189	fops_put(filp->f_op);
	190	filp->f_op = fops_get(old_fops);
	191	}
	192	fops_put(old_fops);
	193
	194	return err;
	195	}
	196
	197	/**
	198	* Check whether DRI will run on this CPU.
	199	*
	200	* \return non-zero if the DRI will run on this CPU, or zero otherwise.
	201	*/
	202	static int drm_cpu_valid(void)
	203	{
	204	#if defined(__i386__)
	205	if (boot_cpu_data.x86 == 3)
	206	return 0; /* No cmpxchg on a 386 */
	207	#endif
	208	#if defined(__sparc__) && !defined(__sparc_v9__)
	209	return 0; /* No cmpxchg before v9 sparc. */
	210	#endif
	211	return 1;
	212	}
	213
	214	/**
	215	* Called whenever a process opens /dev/drm.
	216	*
	217	* \param inode device inode.
	218	* \param filp file pointer.
	219	* \param dev device.
	220	* \return zero on success or a negative number on failure.
	221	*
	222	* Creates and initializes a drm_file structure for the file private data in \p
	223	* filp and add it into the double linked list in \p dev.
	224	*/
	225	static int drm_open_helper(struct inode inode, struct file filp,
84b1fd10	226	struct drm_device * dev)
d985c108 DA	227	{
d985c108 DA	228	int minor = iminor(inode);
84b1fd10	229	struct drm_file *priv;
d985c108 DA	230	int ret;
	231
	232	if (filp->f_flags & O_EXCL)
	233	return -EBUSY; /* No exclusive opens */
	234	if (!drm_cpu_valid())
	235	return -EINVAL;
	236
	237	DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
	238
	239	priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
	240	if (!priv)
	241	return -ENOMEM;
	242
	243	memset(priv, 0, sizeof(*priv));
	244	filp->private_data = priv;
	245	priv->uid = current->euid;
	246	priv->pid = current->pid;
	247	priv->minor = minor;
	248	priv->head = drm_heads[minor];
	249	priv->ioctl_count = 0;
	250	/* for compatibility root is always authenticated */
	251	priv->authenticated = capable(CAP_SYS_ADMIN);
	252	priv->lock_count = 0;
	253
bd1b331f DA	254	INIT_LIST_HEAD(&priv->lhead);
bd1b331f DA	255
d985c108 DA	256	if (dev->driver->open) {
	257	ret = dev->driver->open(dev, priv);
	258	if (ret < 0)
	259	goto out_free;
	260	}
	261
30e2fb18	262	mutex_lock(&dev->struct_mutex);
bd1b331f	263	if (list_empty(&dev->filelist))
d985c108	264	priv->master = 1;
bd1b331f DA	265
bd1b331f DA	266	list_add(&priv->lhead, &dev->filelist);
30e2fb18	267	mutex_unlock(&dev->struct_mutex);
d985c108 DA	268
	269	#ifdef __alpha__
	270	/*
	271	* Default the hose
	272	*/
	273	if (!dev->hose) {
	274	struct pci_dev *pci_dev;
	275	pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
	276	if (pci_dev) {
	277	dev->hose = pci_dev->sysdata;
	278	pci_dev_put(pci_dev);
	279	}
	280	if (!dev->hose) {
	281	struct pci_bus *b = pci_bus_b(pci_root_buses.next);
	282	if (b)
	283	dev->hose = b->sysdata;
	284	}
	285	}
	286	#endif
	287
	288	return 0;
	289	out_free:
	290	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
	291	filp->private_data = NULL;
	292	return ret;
	293	}
	294
	295	/** No-op. */
	296	int drm_fasync(int fd, struct file *filp, int on)
	297	{
84b1fd10 DA	298	struct drm_file *priv = filp->private_data;
84b1fd10 DA	299	struct drm_device *dev = priv->head->dev;
d985c108 DA	300	int retcode;
	301
	302	DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
	303	(long)old_encode_dev(priv->head->device));
	304	retcode = fasync_helper(fd, filp, on, &dev->buf_async);
	305	if (retcode < 0)
	306	return retcode;
	307	return 0;
	308	}
	309	EXPORT_SYMBOL(drm_fasync);
	310
1da177e4 LT	311	/**
	312	* Release file.
	313	*
	314	* \param inode device inode
	315	* \param filp file pointer.
	316	* \return zero on success or a negative number on failure.
	317	*
	318	* If the hardware lock is held then free it, and take it again for the kernel
	319	* context since it's necessary to reclaim buffers. Unlink the file private
	320	* data from its list and free it. Decreases the open count and if it reaches
22eae947	321	* zero calls drm_lastclose().
1da177e4	322	*/
b5e89ed5	323	int drm_release(struct inode inode, struct file filp)
1da177e4	324	{
84b1fd10 DA	325	struct drm_file *priv = filp->private_data;
84b1fd10 DA	326	struct drm_device *dev;
1da177e4 LT	327	int retcode = 0;
	328
	329	lock_kernel();
	330	dev = priv->head->dev;
	331
b5e89ed5	332	DRM_DEBUG("open_count = %d\n", dev->open_count);
1da177e4	333
22eae947 DA	334	if (dev->driver->preclose)
22eae947 DA	335	dev->driver->preclose(dev, filp);
1da177e4 LT	336
	337	/* ========================================================
	338	* Begin inline drm_release
	339	*/
	340
b5e89ed5 DA	341	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
	342	current->pid, (long)old_encode_dev(priv->head->device),
	343	dev->open_count);
	344
040ac320 TH	345	if (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) {
040ac320 TH	346	if (drm_i_have_hw_lock(filp)) {
22eae947	347	dev->driver->reclaim_buffers_locked(dev, filp);
040ac320 TH	348	} else {
	349	unsigned long _end=jiffies + 3*DRM_HZ;
	350	int locked = 0;
	351
	352	drm_idlelock_take(&dev->lock);
	353
	354	/*
	355	* Wait for a while.
	356	*/
	357
	358	do{
	359	spin_lock(&dev->lock.spinlock);
	360	locked = dev->lock.idle_has_lock;
	361	spin_unlock(&dev->lock.spinlock);
	362	if (locked)
	363	break;
	364	schedule();
	365	} while (!time_after_eq(jiffies, _end));
	366
	367	if (!locked) {
	368	DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
	369	"\tdriver to use reclaim_buffers_idlelocked() instead.\n"
	370	"\tI will go on reclaiming the buffers anyway.\n");
1da177e4	371	}
040ac320	372
22eae947	373	dev->driver->reclaim_buffers_locked(dev, filp);
040ac320	374	drm_idlelock_release(&dev->lock);
1da177e4 LT	375	}
1da177e4 LT	376	}
b5e89ed5	377
040ac320 TH	378	if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) {
	379
	380	drm_idlelock_take(&dev->lock);
	381	dev->driver->reclaim_buffers_idlelocked(dev, filp);
	382	drm_idlelock_release(&dev->lock);
	383
	384	}
	385
	386	if (drm_i_have_hw_lock(filp)) {
	387	DRM_DEBUG("File %p released, freeing lock for context %d\n",
	388	filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
	389
	390	drm_lock_free(&dev->lock,
	391	_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
	392	}
	393
	394
22eae947 DA	395	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
22eae947 DA	396	!dev->driver->reclaim_buffers_locked) {
1da177e4 LT	397	dev->driver->reclaim_buffers(dev, filp);
	398	}
	399
b5e89ed5	400	drm_fasync(-1, filp, 0);
1da177e4	401
30e2fb18	402	mutex_lock(&dev->ctxlist_mutex);
bd1b331f	403	if (!list_empty(&dev->ctxlist)) {
55910517	404	struct drm_ctx_list pos, n;
1da177e4	405
bd1b331f	406	list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
b5e89ed5 DA	407	if (pos->tag == priv &&
b5e89ed5 DA	408	pos->handle != DRM_KERNEL_CONTEXT) {
1da177e4	409	if (dev->driver->context_dtor)
b5e89ed5 DA	410	dev->driver->context_dtor(dev,
b5e89ed5 DA	411	pos->handle);
1da177e4	412
b5e89ed5	413	drm_ctxbitmap_free(dev, pos->handle);
1da177e4	414
b5e89ed5 DA	415	list_del(&pos->head);
b5e89ed5 DA	416	drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
1da177e4 LT	417	--dev->ctx_count;
	418	}
	419	}
	420	}
30e2fb18	421	mutex_unlock(&dev->ctxlist_mutex);
1da177e4	422
30e2fb18	423	mutex_lock(&dev->struct_mutex);
b5e89ed5	424	if (priv->remove_auth_on_close == 1) {
84b1fd10	425	struct drm_file *temp;
bd1b331f DA	426
bd1b331f DA	427	list_for_each_entry(temp, &dev->filelist, lhead)
1da177e4	428	temp->authenticated = 0;
1da177e4	429	}
bd1b331f	430	list_del(&priv->lhead);
30e2fb18	431	mutex_unlock(&dev->struct_mutex);
b5e89ed5	432
22eae947 DA	433	if (dev->driver->postclose)
22eae947 DA	434	dev->driver->postclose(dev, priv);
b5e89ed5	435	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
1da177e4 LT	436
	437	/* ========================================================
	438	* End inline drm_release
	439	*/
	440
b5e89ed5 DA	441	atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
	442	spin_lock(&dev->count_lock);
	443	if (!--dev->open_count) {
	444	if (atomic_read(&dev->ioctl_count) \|\| dev->blocked) {
	445	DRM_ERROR("Device busy: %d %d\n",
	446	atomic_read(&dev->ioctl_count), dev->blocked);
	447	spin_unlock(&dev->count_lock);
1da177e4 LT	448	unlock_kernel();
	449	return -EBUSY;
	450	}
b5e89ed5	451	spin_unlock(&dev->count_lock);
1da177e4	452	unlock_kernel();
22eae947	453	return drm_lastclose(dev);
1da177e4	454	}
b5e89ed5	455	spin_unlock(&dev->count_lock);
1da177e4 LT	456
	457	unlock_kernel();
	458
	459	return retcode;
	460	}
	461	EXPORT_SYMBOL(drm_release);
	462
1da177e4 LT	463	/** No-op. */
	464	unsigned int drm_poll(struct file filp, struct poll_table_struct wait)
	465	{
	466	return 0;
	467	}
b5e89ed5	468	EXPORT_SYMBOL(drm_poll);