[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / 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>
#include <linux/slab.h>
#include <linux/smp_lock.h>

/* from BKL pushdown: note that nothing else serializes idr_find() */
DEFINE_MUTEX(drm_global_mutex);

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

static int drm_setup(struct drm_device * 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);

	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
	    !drm_core_check_feature(dev, DRIVER_MODESET)) {
		dev->buf_use = 0;
		atomic_set(&dev->buf_alloc, 0);

		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);

	dev->sigdata.lock = NULL;

	dev->queue_count = 0;
	dev->queue_reserved = 0;
	dev->queue_slots = 0;
	dev->queuelist = NULL;
	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_id = iminor(inode);
	struct drm_minor *minor;
	int retcode = 0;

	minor = idr_find(&drm_minors_idr, minor_id);
	if (!minor)
		return -ENODEV;

	if (!(dev = 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);
			retcode = drm_setup(dev);
			goto out;
		}
		spin_unlock(&dev->count_lock);
	}
out:
	if (!retcode) {
		mutex_lock(&dev->struct_mutex);
		if (minor->type == DRM_MINOR_LEGACY) {
			if (dev->dev_mapping == NULL)
				dev->dev_mapping = inode->i_mapping;
			else if (dev->dev_mapping != inode->i_mapping)
				retcode = -ENODEV;
		}
		mutex_unlock(&dev->struct_mutex);
	}

	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;
	struct drm_minor *minor;
	int minor_id = iminor(inode);
	int err = -ENODEV;
	const struct file_operations *old_fops;

	DRM_DEBUG("\n");

	mutex_lock(&drm_global_mutex);
	minor = idr_find(&drm_minors_idr, minor_id);
	if (!minor)
		goto out;

	if (!(dev = minor->dev))
		goto out;

	old_fops = filp->f_op;
	filp->f_op = fops_get(&dev->driver->fops);
	if (filp->f_op == NULL) {
		filp->f_op = old_fops;
		goto out;
	}
	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);

out:
	mutex_unlock(&drm_global_mutex);
	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_id = 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", task_pid_nr(current), minor_id);

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	filp->private_data = priv;
	priv->filp = filp;
	priv->uid = current_euid();
	priv->pid = task_pid_nr(current);
	priv->minor = idr_find(&drm_minors_idr, minor_id);
	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);
	INIT_LIST_HEAD(&priv->fbs);
	INIT_LIST_HEAD(&priv->event_list);
	init_waitqueue_head(&priv->event_wait);
	priv->event_space = 4096; /* set aside 4k for event buffer */

	if (dev->driver->driver_features & DRIVER_GEM)
		drm_gem_open(dev, priv);

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


	/* if there is no current master make this fd it */
	mutex_lock(&dev->struct_mutex);
	if (!priv->minor->master) {
		/* create a new master */
		priv->minor->master = drm_master_create(priv->minor);
		if (!priv->minor->master) {
			mutex_unlock(&dev->struct_mutex);
			ret = -ENOMEM;
			goto out_free;
		}

		priv->is_master = 1;
		/* take another reference for the copy in the local file priv */
		priv->master = drm_master_get(priv->minor->master);

		priv->authenticated = 1;

		mutex_unlock(&dev->struct_mutex);
		if (dev->driver->master_create) {
			ret = dev->driver->master_create(dev, priv->master);
			if (ret) {
				mutex_lock(&dev->struct_mutex);
				/* drop both references if this fails */
				drm_master_put(&priv->minor->master);
				drm_master_put(&priv->master);
				mutex_unlock(&dev->struct_mutex);
				goto out_free;
			}
		}
		mutex_lock(&dev->struct_mutex);
		if (dev->driver->master_set) {
			ret = dev->driver->master_set(dev, priv, true);
			if (ret) {
				/* drop both references if this fails */
				drm_master_put(&priv->minor->master);
				drm_master_put(&priv->master);
				mutex_unlock(&dev->struct_mutex);
				goto out_free;
			}
		}
		mutex_unlock(&dev->struct_mutex);
	} else {
		/* get a reference to the master */
		priv->master = drm_master_get(priv->minor->master);
		mutex_unlock(&dev->struct_mutex);
	}

	mutex_lock(&dev->struct_mutex);
	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:
	kfree(priv);
	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->minor->dev;

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

/*
 * Reclaim locked buffers; note that this may be a bad idea if the current
 * context doesn't have the hw lock...
 */
static void drm_reclaim_locked_buffers(struct drm_device *dev, struct file *f)
{
	struct drm_file *file_priv = f->private_data;

	if (drm_i_have_hw_lock(dev, file_priv)) {
		dev->driver->reclaim_buffers_locked(dev, file_priv);
	} else {
		unsigned long _end = jiffies + 3 * DRM_HZ;
		int locked = 0;

		drm_idlelock_take(&file_priv->master->lock);

		/*
		 * Wait for a while.
		 */
		do {
			spin_lock_bh(&file_priv->master->lock.spinlock);
			locked = file_priv->master->lock.idle_has_lock;
			spin_unlock_bh(&file_priv->master->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, file_priv);
		drm_idlelock_release(&file_priv->master->lock);
	}
}

static void drm_master_release(struct drm_device *dev, struct file *filp)
{
	struct drm_file *file_priv = filp->private_data;

	if (dev->driver->reclaim_buffers_locked &&
	    file_priv->master->lock.hw_lock)
		drm_reclaim_locked_buffers(dev, filp);

	if (dev->driver->reclaim_buffers_idlelocked &&
	    file_priv->master->lock.hw_lock) {
		drm_idlelock_take(&file_priv->master->lock);
		dev->driver->reclaim_buffers_idlelocked(dev, file_priv);
		drm_idlelock_release(&file_priv->master->lock);
	}


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

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

static void drm_events_release(struct drm_file *file_priv)
{
	struct drm_device *dev = file_priv->minor->dev;
	struct drm_pending_event *e, *et;
	struct drm_pending_vblank_event *v, *vt;
	unsigned long flags;

	spin_lock_irqsave(&dev->event_lock, flags);

	/* Remove pending flips */
	list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
		if (v->base.file_priv == file_priv) {
			list_del(&v->base.link);
			drm_vblank_put(dev, v->pipe);
			v->base.destroy(&v->base);
		}

	/* Remove unconsumed events */
	list_for_each_entry_safe(e, et, &file_priv->event_list, link)
		e->destroy(e);

	spin_unlock_irqrestore(&dev->event_lock, flags);
}

/**
 * Release file.
 *
 * \param inode device inode
 * \param file_priv DRM file private.
 * \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 *file_priv = filp->private_data;
	struct drm_device *dev = file_priv->minor->dev;
	int retcode = 0;

	mutex_lock(&drm_global_mutex);

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

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

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

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

	/* if the master has gone away we can't do anything with the lock */
	if (file_priv->minor->master)
		drm_master_release(dev, filp);

	drm_events_release(file_priv);

	if (dev->driver->driver_features & DRIVER_GEM)
		drm_gem_release(dev, file_priv);

	if (dev->driver->driver_features & DRIVER_MODESET)
		drm_fb_release(file_priv);

	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 == file_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);
				kfree(pos);
				--dev->ctx_count;
			}
		}
	}
	mutex_unlock(&dev->ctxlist_mutex);

	mutex_lock(&dev->struct_mutex);

	if (file_priv->is_master) {
		struct drm_master *master = file_priv->master;
		struct drm_file *temp;
		list_for_each_entry(temp, &dev->filelist, lhead) {
			if ((temp->master == file_priv->master) &&
			    (temp != file_priv))
				temp->authenticated = 0;
		}

		/**
		 * Since the master is disappearing, so is the
		 * possibility to lock.
		 */

		if (master->lock.hw_lock) {
			if (dev->sigdata.lock == master->lock.hw_lock)
				dev->sigdata.lock = NULL;
			master->lock.hw_lock = NULL;
			master->lock.file_priv = NULL;
			wake_up_interruptible_all(&master->lock.lock_queue);
		}

		if (file_priv->minor->master == file_priv->master) {
			/* drop the reference held my the minor */
			if (dev->driver->master_drop)
				dev->driver->master_drop(dev, file_priv, true);
			drm_master_put(&file_priv->minor->master);
		}
	}

	/* drop the reference held my the file priv */
	drm_master_put(&file_priv->master);
	file_priv->is_master = 0;
	list_del(&file_priv->lhead);
	mutex_unlock(&dev->struct_mutex);

	if (dev->driver->postclose)
		dev->driver->postclose(dev, file_priv);
	kfree(file_priv);

	/* ========================================================
	 * 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)) {
			DRM_ERROR("Device busy: %d\n",
				  atomic_read(&dev->ioctl_count));
			retcode = -EBUSY;
			goto out;
		}
		retcode = drm_lastclose(dev);
	}
out:
	spin_unlock(&dev->count_lock);
	mutex_unlock(&drm_global_mutex);

	return retcode;
}
EXPORT_SYMBOL(drm_release);

static bool
drm_dequeue_event(struct drm_file *file_priv,
		  size_t total, size_t max, struct drm_pending_event **out)
{
	struct drm_device *dev = file_priv->minor->dev;
	struct drm_pending_event *e;
	unsigned long flags;
	bool ret = false;

	spin_lock_irqsave(&dev->event_lock, flags);

	*out = NULL;
	if (list_empty(&file_priv->event_list))
		goto out;
	e = list_first_entry(&file_priv->event_list,
			     struct drm_pending_event, link);
	if (e->event->length + total > max)
		goto out;

	file_priv->event_space += e->event->length;
	list_del(&e->link);
	*out = e;
	ret = true;

out:
	spin_unlock_irqrestore(&dev->event_lock, flags);
	return ret;
}

ssize_t drm_read(struct file *filp, char __user *buffer,
		 size_t count, loff_t *offset)
{
	struct drm_file *file_priv = filp->private_data;
	struct drm_pending_event *e;
	size_t total;
	ssize_t ret;

	ret = wait_event_interruptible(file_priv->event_wait,
				       !list_empty(&file_priv->event_list));
	if (ret < 0)
		return ret;

	total = 0;
	while (drm_dequeue_event(file_priv, total, count, &e)) {
		if (copy_to_user(buffer + total,
				 e->event, e->event->length)) {
			total = -EFAULT;
			break;
		}

		total += e->event->length;
		e->destroy(e);
	}

	return total;
}
EXPORT_SYMBOL(drm_read);

unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
{
	struct drm_file *file_priv = filp->private_data;
	unsigned int mask = 0;

	poll_wait(filp, &file_priv->event_wait, wait);

	if (!list_empty(&file_priv->event_list))
		mask |= POLLIN | POLLRDNORM;

	return mask;
}
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>
5a0e3ad6	39	#include <linux/slab.h>
70ffa16e	40	#include <linux/smp_lock.h>
1da177e4	41
58374713 AB	42	/* from BKL pushdown: note that nothing else serializes idr_find() */
	43	DEFINE_MUTEX(drm_global_mutex);
	44
b5e89ed5	45	static int drm_open_helper(struct inode inode, struct file filp,
84b1fd10	46	struct drm_device * dev);
c94f7029	47
84b1fd10	48	static int drm_setup(struct drm_device * dev)
1da177e4 LT	49	{
	50	int i;
	51	int ret;
	52
22eae947 DA	53	if (dev->driver->firstopen) {
22eae947 DA	54	ret = dev->driver->firstopen(dev);
b5e89ed5	55	if (ret != 0)
1da177e4 LT	56	return ret;
	57	}
	58
b5e89ed5 DA	59	atomic_set(&dev->ioctl_count, 0);
b5e89ed5 DA	60	atomic_set(&dev->vma_count, 0);
1da177e4	61
f453ba04 DA	62	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
	63	!drm_core_check_feature(dev, DRIVER_MODESET)) {
	64	dev->buf_use = 0;
	65	atomic_set(&dev->buf_alloc, 0);
	66
b5e89ed5 DA	67	i = drm_dma_setup(dev);
b5e89ed5 DA	68	if (i < 0)
1da177e4 LT	69	return i;
	70	}
	71
3d77461e	72	for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
b5e89ed5	73	atomic_set(&dev->counts[i], 0);
1da177e4	74
11d9c2fd	75	dev->sigdata.lock = NULL;
7c1c2871	76
1da177e4 LT	77	dev->queue_count = 0;
	78	dev->queue_reserved = 0;
	79	dev->queue_slots = 0;
	80	dev->queuelist = NULL;
1da177e4 LT	81	dev->context_flag = 0;
	82	dev->interrupt_flag = 0;
	83	dev->dma_flag = 0;
	84	dev->last_context = 0;
	85	dev->last_switch = 0;
	86	dev->last_checked = 0;
b5e89ed5	87	init_waitqueue_head(&dev->context_wait);
1da177e4 LT	88	dev->if_version = 0;
	89
	90	dev->ctx_start = 0;
	91	dev->lck_start = 0;
	92
1da177e4	93	dev->buf_async = NULL;
b5e89ed5 DA	94	init_waitqueue_head(&dev->buf_readers);
b5e89ed5 DA	95	init_waitqueue_head(&dev->buf_writers);
1da177e4	96
b5e89ed5	97	DRM_DEBUG("\n");
1da177e4 LT	98
	99	/*
	100	* The kernel's context could be created here, but is now created
b5e89ed5	101	* in drm_dma_enqueue. This is more resource-efficient for
1da177e4 LT	102	* hardware that does not do DMA, but may mean that
	103	* drm_select_queue fails between the time the interrupt is
	104	* initialized and the time the queues are initialized.
	105	*/
1da177e4 LT	106
	107	return 0;
	108	}
	109
	110	/**
	111	* Open file.
b5e89ed5	112	*
1da177e4 LT	113	* \param inode device inode
	114	* \param filp file pointer.
	115	* \return zero on success or a negative number on failure.
	116	*
	117	* Searches the DRM device with the same minor number, calls open_helper(), and
	118	* increments the device open count. If the open count was previous at zero,
	119	* i.e., it's the first that the device is open, then calls setup().
	120	*/
b5e89ed5	121	int drm_open(struct inode inode, struct file filp)
1da177e4	122	{
84b1fd10	123	struct drm_device *dev = NULL;
2c14f28b DA	124	int minor_id = iminor(inode);
2c14f28b DA	125	struct drm_minor *minor;
1da177e4 LT	126	int retcode = 0;
1da177e4 LT	127
2c14f28b DA	128	minor = idr_find(&drm_minors_idr, minor_id);
2c14f28b DA	129	if (!minor)
1da177e4	130	return -ENODEV;
b5e89ed5	131
2c14f28b	132	if (!(dev = minor->dev))
1da177e4	133	return -ENODEV;
b5e89ed5 DA	134
	135	retcode = drm_open_helper(inode, filp, dev);
	136	if (!retcode) {
	137	atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
	138	spin_lock(&dev->count_lock);
	139	if (!dev->open_count++) {
	140	spin_unlock(&dev->count_lock);
a2c0a97b JB	141	retcode = drm_setup(dev);
a2c0a97b JB	142	goto out;
1da177e4	143	}
b5e89ed5	144	spin_unlock(&dev->count_lock);
1da177e4	145	}
a2c0a97b	146	out:
da584058 CW	147	if (!retcode) {
	148	mutex_lock(&dev->struct_mutex);
	149	if (minor->type == DRM_MINOR_LEGACY) {
	150	if (dev->dev_mapping == NULL)
	151	dev->dev_mapping = inode->i_mapping;
	152	else if (dev->dev_mapping != inode->i_mapping)
	153	retcode = -ENODEV;
	154	}
	155	mutex_unlock(&dev->struct_mutex);
f453ba04	156	}
a2c0a97b	157
1da177e4 LT	158	return retcode;
	159	}
	160	EXPORT_SYMBOL(drm_open);
	161
d985c108 DA	162	/**
	163	* File \c open operation.
	164	*
	165	* \param inode device inode.
	166	* \param filp file pointer.
	167	*
	168	* Puts the dev->fops corresponding to the device minor number into
	169	* \p filp, call the \c open method, and restore the file operations.
	170	*/
	171	int drm_stub_open(struct inode inode, struct file filp)
	172	{
84b1fd10	173	struct drm_device *dev = NULL;
2c14f28b DA	174	struct drm_minor *minor;
2c14f28b DA	175	int minor_id = iminor(inode);
d985c108	176	int err = -ENODEV;
99ac48f5	177	const struct file_operations *old_fops;
d985c108 DA	178
	179	DRM_DEBUG("\n");
	180
58374713	181	mutex_lock(&drm_global_mutex);
2c14f28b DA	182	minor = idr_find(&drm_minors_idr, minor_id);
2c14f28b DA	183	if (!minor)
70ffa16e	184	goto out;
d985c108	185
2c14f28b	186	if (!(dev = minor->dev))
70ffa16e	187	goto out;
d985c108 DA	188
	189	old_fops = filp->f_op;
	190	filp->f_op = fops_get(&dev->driver->fops);
f41ced8f LP	191	if (filp->f_op == NULL) {
	192	filp->f_op = old_fops;
	193	goto out;
	194	}
d985c108 DA	195	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
	196	fops_put(filp->f_op);
	197	filp->f_op = fops_get(old_fops);
	198	}
	199	fops_put(old_fops);
	200
70ffa16e	201	out:
58374713	202	mutex_unlock(&drm_global_mutex);
d985c108 DA	203	return err;
	204	}
	205
	206	/**
	207	* Check whether DRI will run on this CPU.
	208	*
	209	* \return non-zero if the DRI will run on this CPU, or zero otherwise.
	210	*/
	211	static int drm_cpu_valid(void)
	212	{
	213	#if defined(__i386__)
	214	if (boot_cpu_data.x86 == 3)
	215	return 0; /* No cmpxchg on a 386 */
	216	#endif
	217	#if defined(__sparc__) && !defined(__sparc_v9__)
	218	return 0; /* No cmpxchg before v9 sparc. */
	219	#endif
	220	return 1;
	221	}
	222
	223	/**
	224	* Called whenever a process opens /dev/drm.
	225	*
	226	* \param inode device inode.
	227	* \param filp file pointer.
	228	* \param dev device.
	229	* \return zero on success or a negative number on failure.
	230	*
	231	* Creates and initializes a drm_file structure for the file private data in \p
	232	* filp and add it into the double linked list in \p dev.
	233	*/
	234	static int drm_open_helper(struct inode inode, struct file filp,
84b1fd10	235	struct drm_device * dev)
d985c108	236	{
2c14f28b	237	int minor_id = iminor(inode);
84b1fd10	238	struct drm_file *priv;
d985c108 DA	239	int ret;
	240
	241	if (filp->f_flags & O_EXCL)
	242	return -EBUSY; /* No exclusive opens */
	243	if (!drm_cpu_valid())
	244	return -EINVAL;
	245
2c14f28b	246	DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);
d985c108	247
6ebc22e6	248	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
d985c108 DA	249	if (!priv)
	250	return -ENOMEM;
	251
d985c108	252	filp->private_data = priv;
6c340eac	253	priv->filp = filp;
2df68b43	254	priv->uid = current_euid();
ba25f9dc	255	priv->pid = task_pid_nr(current);
2c14f28b	256	priv->minor = idr_find(&drm_minors_idr, minor_id);
d985c108 DA	257	priv->ioctl_count = 0;
	258	/* for compatibility root is always authenticated */
	259	priv->authenticated = capable(CAP_SYS_ADMIN);
	260	priv->lock_count = 0;
	261
bd1b331f	262	INIT_LIST_HEAD(&priv->lhead);
f453ba04	263	INIT_LIST_HEAD(&priv->fbs);
c9a9c5e0 KH	264	INIT_LIST_HEAD(&priv->event_list);
	265	init_waitqueue_head(&priv->event_wait);
	266	priv->event_space = 4096; /* set aside 4k for event buffer */
bd1b331f	267
673a394b EA	268	if (dev->driver->driver_features & DRIVER_GEM)
	269	drm_gem_open(dev, priv);
	270
d985c108 DA	271	if (dev->driver->open) {
	272	ret = dev->driver->open(dev, priv);
	273	if (ret < 0)
	274	goto out_free;
	275	}
	276
7c1c2871 DA	277
7c1c2871 DA	278	/* if there is no current master make this fd it */
30e2fb18	279	mutex_lock(&dev->struct_mutex);
7c1c2871 DA	280	if (!priv->minor->master) {
	281	/* create a new master */
	282	priv->minor->master = drm_master_create(priv->minor);
	283	if (!priv->minor->master) {
dba5ed0c	284	mutex_unlock(&dev->struct_mutex);
7c1c2871 DA	285	ret = -ENOMEM;
	286	goto out_free;
	287	}
	288
	289	priv->is_master = 1;
	290	/* take another reference for the copy in the local file priv */
	291	priv->master = drm_master_get(priv->minor->master);
	292
	293	priv->authenticated = 1;
	294
	295	mutex_unlock(&dev->struct_mutex);
	296	if (dev->driver->master_create) {
	297	ret = dev->driver->master_create(dev, priv->master);
	298	if (ret) {
	299	mutex_lock(&dev->struct_mutex);
	300	/* drop both references if this fails */
	301	drm_master_put(&priv->minor->master);
	302	drm_master_put(&priv->master);
	303	mutex_unlock(&dev->struct_mutex);
	304	goto out_free;
	305	}
	306	}
862302ff TH	307	mutex_lock(&dev->struct_mutex);
	308	if (dev->driver->master_set) {
	309	ret = dev->driver->master_set(dev, priv, true);
	310	if (ret) {
	311	/* drop both references if this fails */
	312	drm_master_put(&priv->minor->master);
	313	drm_master_put(&priv->master);
	314	mutex_unlock(&dev->struct_mutex);
	315	goto out_free;
	316	}
	317	}
	318	mutex_unlock(&dev->struct_mutex);
7c1c2871 DA	319	} else {
	320	/* get a reference to the master */
	321	priv->master = drm_master_get(priv->minor->master);
	322	mutex_unlock(&dev->struct_mutex);
	323	}
bd1b331f	324
7c1c2871	325	mutex_lock(&dev->struct_mutex);
bd1b331f	326	list_add(&priv->lhead, &dev->filelist);
30e2fb18	327	mutex_unlock(&dev->struct_mutex);
d985c108 DA	328
	329	#ifdef __alpha__
	330	/*
	331	* Default the hose
	332	*/
	333	if (!dev->hose) {
	334	struct pci_dev *pci_dev;
	335	pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
	336	if (pci_dev) {
	337	dev->hose = pci_dev->sysdata;
	338	pci_dev_put(pci_dev);
	339	}
	340	if (!dev->hose) {
	341	struct pci_bus *b = pci_bus_b(pci_root_buses.next);
	342	if (b)
	343	dev->hose = b->sysdata;
	344	}
	345	}
	346	#endif
	347
	348	return 0;
	349	out_free:
9a298b2a	350	kfree(priv);
d985c108 DA	351	filp->private_data = NULL;
	352	return ret;
	353	}
	354
	355	/** No-op. */
	356	int drm_fasync(int fd, struct file *filp, int on)
	357	{
84b1fd10	358	struct drm_file *priv = filp->private_data;
2c14f28b	359	struct drm_device *dev = priv->minor->dev;
d985c108 DA	360
d985c108 DA	361	DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
2c14f28b	362	(long)old_encode_dev(priv->minor->device));
60aa4924	363	return fasync_helper(fd, filp, on, &dev->buf_async);
d985c108 DA	364	}
	365	EXPORT_SYMBOL(drm_fasync);
	366
7c1c2871 DA	367	/*
	368	* Reclaim locked buffers; note that this may be a bad idea if the current
	369	* context doesn't have the hw lock...
	370	*/
	371	static void drm_reclaim_locked_buffers(struct drm_device dev, struct file f)
	372	{
	373	struct drm_file *file_priv = f->private_data;
	374
	375	if (drm_i_have_hw_lock(dev, file_priv)) {
	376	dev->driver->reclaim_buffers_locked(dev, file_priv);
	377	} else {
	378	unsigned long _end = jiffies + 3 * DRM_HZ;
	379	int locked = 0;
	380
	381	drm_idlelock_take(&file_priv->master->lock);
	382
	383	/*
	384	* Wait for a while.
	385	*/
	386	do {
	387	spin_lock_bh(&file_priv->master->lock.spinlock);
	388	locked = file_priv->master->lock.idle_has_lock;
	389	spin_unlock_bh(&file_priv->master->lock.spinlock);
	390	if (locked)
	391	break;
	392	schedule();
	393	} while (!time_after_eq(jiffies, _end));
	394
	395	if (!locked) {
	396	DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
	397	"\tdriver to use reclaim_buffers_idlelocked() instead.\n"
	398	"\tI will go on reclaiming the buffers anyway.\n");
	399	}
	400
	401	dev->driver->reclaim_buffers_locked(dev, file_priv);
	402	drm_idlelock_release(&file_priv->master->lock);
	403	}
	404	}
	405
	406	static void drm_master_release(struct drm_device dev, struct file filp)
	407	{
	408	struct drm_file *file_priv = filp->private_data;
	409
	410	if (dev->driver->reclaim_buffers_locked &&
	411	file_priv->master->lock.hw_lock)
	412	drm_reclaim_locked_buffers(dev, filp);
	413
	414	if (dev->driver->reclaim_buffers_idlelocked &&
	415	file_priv->master->lock.hw_lock) {
	416	drm_idlelock_take(&file_priv->master->lock);
	417	dev->driver->reclaim_buffers_idlelocked(dev, file_priv);
	418	drm_idlelock_release(&file_priv->master->lock);
	419	}
	420
	421
	422	if (drm_i_have_hw_lock(dev, file_priv)) {
	423	DRM_DEBUG("File %p released, freeing lock for context %d\n",
	424	filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
	425	drm_lock_free(&file_priv->master->lock,
	426	_DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
	427	}
	428
	429	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
	430	!dev->driver->reclaim_buffers_locked) {
431	dev->driver->reclaim_buffers(dev, file_priv);
432	}
433	}
434
c9a9c5e0 KH	435	static void drm_events_release(struct drm_file *file_priv)
	436	{
	437	struct drm_device *dev = file_priv->minor->dev;
	438	struct drm_pending_event e, et;
	439	struct drm_pending_vblank_event v, vt;
	440	unsigned long flags;
	441
	442	spin_lock_irqsave(&dev->event_lock, flags);
	443
	444	/* Remove pending flips */
	445	list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
	446	if (v->base.file_priv == file_priv) {
	447	list_del(&v->base.link);
	448	drm_vblank_put(dev, v->pipe);
	449	v->base.destroy(&v->base);
	450	}
	451
	452	/* Remove unconsumed events */
	453	list_for_each_entry_safe(e, et, &file_priv->event_list, link)
	454	e->destroy(e);
	455
	456	spin_unlock_irqrestore(&dev->event_lock, flags);
	457	}
	458
1da177e4 LT	459	/**
	460	* Release file.
	461	*
	462	* \param inode device inode
6c340eac	463	* \param file_priv DRM file private.
1da177e4 LT	464	* \return zero on success or a negative number on failure.
	465	*
	466	* If the hardware lock is held then free it, and take it again for the kernel
	467	* context since it's necessary to reclaim buffers. Unlink the file private
	468	* data from its list and free it. Decreases the open count and if it reaches
22eae947	469	* zero calls drm_lastclose().
1da177e4	470	*/
b5e89ed5	471	int drm_release(struct inode inode, struct file filp)
1da177e4	472	{
6c340eac	473	struct drm_file *file_priv = filp->private_data;
2c14f28b	474	struct drm_device *dev = file_priv->minor->dev;
1da177e4 LT	475	int retcode = 0;
1da177e4 LT	476
58374713	477	mutex_lock(&drm_global_mutex);
1da177e4	478
b5e89ed5	479	DRM_DEBUG("open_count = %d\n", dev->open_count);
1da177e4	480
22eae947	481	if (dev->driver->preclose)
6c340eac	482	dev->driver->preclose(dev, file_priv);
1da177e4 LT	483
	484	/* ========================================================
	485	* Begin inline drm_release
	486	*/
	487
b5e89ed5	488	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
ba25f9dc	489	task_pid_nr(current),
2c14f28b	490	(long)old_encode_dev(file_priv->minor->device),
b5e89ed5 DA	491	dev->open_count);
b5e89ed5 DA	492
7c1c2871 DA	493	/* if the master has gone away we can't do anything with the lock */
	494	if (file_priv->minor->master)
	495	drm_master_release(dev, filp);
1da177e4	496
c9a9c5e0 KH	497	drm_events_release(file_priv);
c9a9c5e0 KH	498
673a394b EA	499	if (dev->driver->driver_features & DRIVER_GEM)
	500	drm_gem_release(dev, file_priv);
	501
ea39f835 KH	502	if (dev->driver->driver_features & DRIVER_MODESET)
	503	drm_fb_release(file_priv);
	504
30e2fb18	505	mutex_lock(&dev->ctxlist_mutex);
bd1b331f	506	if (!list_empty(&dev->ctxlist)) {
55910517	507	struct drm_ctx_list pos, n;
1da177e4	508
bd1b331f	509	list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
6c340eac	510	if (pos->tag == file_priv &&
b5e89ed5	511	pos->handle != DRM_KERNEL_CONTEXT) {
1da177e4	512	if (dev->driver->context_dtor)
b5e89ed5 DA	513	dev->driver->context_dtor(dev,
b5e89ed5 DA	514	pos->handle);
1da177e4	515
b5e89ed5	516	drm_ctxbitmap_free(dev, pos->handle);
1da177e4	517
b5e89ed5	518	list_del(&pos->head);
9a298b2a	519	kfree(pos);
1da177e4 LT	520	--dev->ctx_count;
	521	}
	522	}
	523	}
30e2fb18	524	mutex_unlock(&dev->ctxlist_mutex);
1da177e4	525
30e2fb18	526	mutex_lock(&dev->struct_mutex);
7c1c2871 DA	527
7c1c2871 DA	528	if (file_priv->is_master) {
fda714c2	529	struct drm_master *master = file_priv->master;
84b1fd10	530	struct drm_file *temp;
7c1c2871 DA	531	list_for_each_entry(temp, &dev->filelist, lhead) {
	532	if ((temp->master == file_priv->master) &&
	533	(temp != file_priv))
	534	temp->authenticated = 0;
	535	}
bd1b331f	536
fda714c2 TH	537	/**
	538	* Since the master is disappearing, so is the
	539	* possibility to lock.
	540	*/
	541
	542	if (master->lock.hw_lock) {
	543	if (dev->sigdata.lock == master->lock.hw_lock)
	544	dev->sigdata.lock = NULL;
	545	master->lock.hw_lock = NULL;
	546	master->lock.file_priv = NULL;
	547	wake_up_interruptible_all(&master->lock.lock_queue);
	548	}
	549
7c1c2871 DA	550	if (file_priv->minor->master == file_priv->master) {
7c1c2871 DA	551	/* drop the reference held my the minor */
862302ff TH	552	if (dev->driver->master_drop)
862302ff TH	553	dev->driver->master_drop(dev, file_priv, true);
7c1c2871 DA	554	drm_master_put(&file_priv->minor->master);
7c1c2871 DA	555	}
1da177e4	556	}
7c1c2871 DA	557
	558	/* drop the reference held my the file priv */
	559	drm_master_put(&file_priv->master);
	560	file_priv->is_master = 0;
6c340eac	561	list_del(&file_priv->lhead);
30e2fb18	562	mutex_unlock(&dev->struct_mutex);
b5e89ed5	563
22eae947	564	if (dev->driver->postclose)
6c340eac	565	dev->driver->postclose(dev, file_priv);
9a298b2a	566	kfree(file_priv);
1da177e4 LT	567
	568	/* ========================================================
	569	* End inline drm_release
	570	*/
	571
b5e89ed5 DA	572	atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
	573	spin_lock(&dev->count_lock);
	574	if (!--dev->open_count) {
7c1c2871 DA	575	if (atomic_read(&dev->ioctl_count)) {
	576	DRM_ERROR("Device busy: %d\n",
	577	atomic_read(&dev->ioctl_count));
58374713 AB	578	retcode = -EBUSY;
58374713 AB	579	goto out;
1da177e4	580	}
58374713	581	retcode = drm_lastclose(dev);
1da177e4	582	}
58374713	583	out:
b5e89ed5	584	spin_unlock(&dev->count_lock);
58374713	585	mutex_unlock(&drm_global_mutex);
1da177e4 LT	586
	587	return retcode;
	588	}
	589	EXPORT_SYMBOL(drm_release);
	590
c9a9c5e0 KH	591	static bool
	592	drm_dequeue_event(struct drm_file *file_priv,
	593	size_t total, size_t max, struct drm_pending_event **out)
	594	{
	595	struct drm_device *dev = file_priv->minor->dev;
	596	struct drm_pending_event *e;
	597	unsigned long flags;
	598	bool ret = false;
	599
	600	spin_lock_irqsave(&dev->event_lock, flags);
	601
	602	*out = NULL;
	603	if (list_empty(&file_priv->event_list))
	604	goto out;
	605	e = list_first_entry(&file_priv->event_list,
	606	struct drm_pending_event, link);
	607	if (e->event->length + total > max)
	608	goto out;
	609
	610	file_priv->event_space += e->event->length;
	611	list_del(&e->link);
	612	*out = e;
	613	ret = true;
	614
	615	out:
	616	spin_unlock_irqrestore(&dev->event_lock, flags);
	617	return ret;
	618	}
	619
	620	ssize_t drm_read(struct file filp, char __user buffer,
	621	size_t count, loff_t *offset)
	622	{
	623	struct drm_file *file_priv = filp->private_data;
	624	struct drm_pending_event *e;
	625	size_t total;
	626	ssize_t ret;
	627
	628	ret = wait_event_interruptible(file_priv->event_wait,
	629	!list_empty(&file_priv->event_list));
	630	if (ret < 0)
	631	return ret;
	632
	633	total = 0;
	634	while (drm_dequeue_event(file_priv, total, count, &e)) {
	635	if (copy_to_user(buffer + total,
	636	e->event, e->event->length)) {
	637	total = -EFAULT;
	638	break;
	639	}
	640
	641	total += e->event->length;
	642	e->destroy(e);
	643	}
	644
	645	return total;
	646	}
	647	EXPORT_SYMBOL(drm_read);
	648
1da177e4 LT	649	unsigned int drm_poll(struct file filp, struct poll_table_struct wait)
1da177e4 LT	650	{
c9a9c5e0 KH	651	struct drm_file *file_priv = filp->private_data;
	652	unsigned int mask = 0;
	653
	654	poll_wait(filp, &file_priv->event_wait, wait);
	655
	656	if (!list_empty(&file_priv->event_list))
	657	mask \|= POLLIN \| POLLRDNORM;
	658
	659	return mask;
1da177e4	660	}
b5e89ed5	661	EXPORT_SYMBOL(drm_poll);