[net-next-2.6.git] / drivers / char / drm / drm_drv.c

/**
 * \file drm_drv.c
 * Generic driver template
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 *
 * To use this template, you must at least define the following (samples
 * given for the MGA driver):
 *
 * \code
 * #define DRIVER_AUTHOR	"VA Linux Systems, Inc."
 *
 * #define DRIVER_NAME		"mga"
 * #define DRIVER_DESC		"Matrox G200/G400"
 * #define DRIVER_DATE		"20001127"
 *
 * #define DRIVER_IOCTL_COUNT	DRM_ARRAY_SIZE( mga_ioctls )
 *
 * #define drm_x		mga_##x
 * \endcode
 */

/*
 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
 *
 * Copyright 1999, 2000 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_core.h"

static int drm_version(struct inode *inode, struct file *filp,
		       unsigned int cmd, unsigned long arg);

/** Ioctl table */
static drm_ioctl_desc_t drm_ioctls[] = {
	[DRM_IOCTL_NR(DRM_IOCTL_VERSION)] = {drm_version, 0},
	[DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)] = {drm_getunique, 0},
	[DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)] = {drm_getmagic, 0},
	[DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)] = {drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_GET_MAP)] = {drm_getmap, 0},
	[DRM_IOCTL_NR(DRM_IOCTL_GET_CLIENT)] = {drm_getclient, 0},
	[DRM_IOCTL_NR(DRM_IOCTL_GET_STATS)] = {drm_getstats, 0},
	[DRM_IOCTL_NR(DRM_IOCTL_SET_VERSION)] = {drm_setversion, DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = {drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_BLOCK)] = {drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)] = {drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)] = {drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},

	[DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)] = {drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_RM_MAP)] = {drm_rmmap_ioctl, DRM_AUTH},

	[DRM_IOCTL_NR(DRM_IOCTL_SET_SAREA_CTX)] = {drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_GET_SAREA_CTX)] = {drm_getsareactx, DRM_AUTH},

	[DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)] = {drm_addctx, DRM_AUTH|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)] = {drm_rmctx, DRM_AUTH|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)] = {drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)] = {drm_getctx, DRM_AUTH},
	[DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = {drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)] = {drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)] = {drm_resctx, DRM_AUTH},

	[DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)] = {drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)] = {drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},

	[DRM_IOCTL_NR(DRM_IOCTL_LOCK)] = {drm_lock, DRM_AUTH},
	[DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)] = {drm_unlock, DRM_AUTH},

	[DRM_IOCTL_NR(DRM_IOCTL_FINISH)] = {drm_noop, DRM_AUTH},

	[DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)] = {drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)] = {drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)] = {drm_infobufs, DRM_AUTH},
	[DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)] = {drm_mapbufs, DRM_AUTH},
	[DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)] = {drm_freebufs, DRM_AUTH},
	/* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
	[DRM_IOCTL_NR(DRM_IOCTL_DMA)] = {NULL, DRM_AUTH},

	[DRM_IOCTL_NR(DRM_IOCTL_CONTROL)] = {drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},

#if __OS_HAS_AGP
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = {drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = {drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)] = {drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)] = {drm_agp_info_ioctl, DRM_AUTH},
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)] = {drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)] = {drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)] = {drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)] = {drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
#endif

	[DRM_IOCTL_NR(DRM_IOCTL_SG_ALLOC)] = {drm_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
	[DRM_IOCTL_NR(DRM_IOCTL_SG_FREE)] = {drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},

	[DRM_IOCTL_NR(DRM_IOCTL_WAIT_VBLANK)] = {drm_wait_vblank, 0},
};

#define DRIVER_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )

/**
 * Take down the DRM device.
 *
 * \param dev DRM device structure.
 *
 * Frees every resource in \p dev.
 *
 * \sa drm_device
 */
int drm_lastclose(drm_device_t * dev)
{
	drm_magic_entry_t *pt, *next;
	drm_map_list_t *r_list;
	drm_vma_entry_t *vma, *vma_next;
	int i;

	DRM_DEBUG("\n");

	if (dev->driver->lastclose)
		dev->driver->lastclose(dev);
	DRM_DEBUG("driver lastclose completed\n");

	if (dev->unique) {
		drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
		dev->unique = NULL;
		dev->unique_len = 0;
	}

	if (dev->irq_enabled)
		drm_irq_uninstall(dev);

	mutex_lock(&dev->struct_mutex);
	del_timer(&dev->timer);

	/* Clear pid list */
	list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
		list_del(&pt->head);
		drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
		drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
	}

	/* Clear AGP information */
	if (drm_core_has_AGP(dev) && dev->agp) {
		drm_agp_mem_t *entry;
		drm_agp_mem_t *nexte;

		/* Remove AGP resources, but leave dev->agp
		   intact until drv_cleanup is called. */
		for (entry = dev->agp->memory; entry; entry = nexte) {
			nexte = entry->next;
			if (entry->bound)
				drm_unbind_agp(entry->memory);
			drm_free_agp(entry->memory, entry->pages);
			drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
		}
		dev->agp->memory = NULL;

		if (dev->agp->acquired)
			drm_agp_release(dev);

		dev->agp->acquired = 0;
		dev->agp->enabled = 0;
	}
	if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
		drm_sg_cleanup(dev->sg);
		dev->sg = NULL;
	}

	/* Clear vma list (only built for debugging) */
	if (dev->vmalist) {
		for (vma = dev->vmalist; vma; vma = vma_next) {
			vma_next = vma->next;
			drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
		}
		dev->vmalist = NULL;
	}

	if (dev->maplist) {
		while (!list_empty(&dev->maplist->head)) {
			struct list_head *list = dev->maplist->head.next;
			r_list = list_entry(list, drm_map_list_t, head);
			drm_rmmap_locked(dev, r_list->map);
		}
	}

	if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
		for (i = 0; i < dev->queue_count; i++) {
			if (dev->queuelist[i]) {
				drm_free(dev->queuelist[i],
					 sizeof(*dev->queuelist[0]),
					 DRM_MEM_QUEUES);
				dev->queuelist[i] = NULL;
			}
		}
		drm_free(dev->queuelist,
			 dev->queue_slots * sizeof(*dev->queuelist),
			 DRM_MEM_QUEUES);
		dev->queuelist = NULL;
	}
	dev->queue_count = 0;

	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
		drm_dma_takedown(dev);

	if (dev->lock.hw_lock) {
		dev->sigdata.lock = dev->lock.hw_lock = NULL;	/* SHM removed */
		dev->lock.filp = NULL;
		wake_up_interruptible(&dev->lock.lock_queue);
	}
	mutex_unlock(&dev->struct_mutex);

	DRM_DEBUG("lastclose completed\n");
	return 0;
}

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

	DRM_DEBUG("\n");

	drm_mem_init();

	for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
		pid = (struct pci_device_id *)&driver->pci_driver.id_table[i];

		pdev = NULL;
		/* pass back in pdev to account for multiple identical cards */
		while ((pdev =
			pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
				       pid->subdevice, pdev)) != NULL) {
			/* stealth mode requires a manual probe */
			pci_dev_get(pdev);
			drm_get_dev(pdev, pid, driver);
		}
	}
	return 0;
}

EXPORT_SYMBOL(drm_init);

/**
 * Called via cleanup_module() at module unload time.
 *
 * Cleans up all DRM device, calling drm_lastclose().
 *
 * \sa drm_init
 */
static void drm_cleanup(drm_device_t * dev)
{
	DRM_DEBUG("\n");

	if (!dev) {
		DRM_ERROR("cleanup called no dev\n");
		return;
	}

	drm_lastclose(dev);

	if (dev->maplist) {
		drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
		dev->maplist = NULL;
	}

	drm_ctxbitmap_cleanup(dev);

	if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
	    dev->agp && dev->agp->agp_mtrr >= 0) {
		int retval;
		retval = mtrr_del(dev->agp->agp_mtrr,
				  dev->agp->agp_info.aper_base,
				  dev->agp->agp_info.aper_size * 1024 * 1024);
		DRM_DEBUG("mtrr_del=%d\n", retval);
	}

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

	if (dev->driver->unload)
		dev->driver->unload(dev);

	drm_put_head(&dev->primary);
	if (drm_put_dev(dev))
		DRM_ERROR("Cannot unload module\n");
}

void drm_exit(struct drm_driver *driver)
{
	int i;
	drm_device_t *dev = NULL;
	drm_head_t *head;

	DRM_DEBUG("\n");

	for (i = 0; i < drm_cards_limit; i++) {
		head = drm_heads[i];
		if (!head)
			continue;
		if (!head->dev)
			continue;
		if (head->dev->driver != driver)
			continue;
		dev = head->dev;
		if (dev) {
			/* release the pci driver */
			if (dev->pdev)
				pci_dev_put(dev->pdev);
			drm_cleanup(dev);
		}
	}
	DRM_INFO("Module unloaded\n");
}

EXPORT_SYMBOL(drm_exit);

/** File operations structure */
static struct file_operations drm_stub_fops = {
	.owner = THIS_MODULE,
	.open = drm_stub_open
};

static int __init drm_core_init(void)
{
	int ret = -ENOMEM;

	drm_cards_limit =
	    (drm_cards_limit <
	     DRM_MAX_MINOR + 1 ? drm_cards_limit : DRM_MAX_MINOR + 1);
	drm_heads =
	    drm_calloc(drm_cards_limit, sizeof(*drm_heads), DRM_MEM_STUB);
	if (!drm_heads)
		goto err_p1;

	if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
		goto err_p1;

	drm_class = drm_sysfs_create(THIS_MODULE, "drm");
	if (IS_ERR(drm_class)) {
		printk(KERN_ERR "DRM: Error creating drm class.\n");
		ret = PTR_ERR(drm_class);
		goto err_p2;
	}

	drm_proc_root = proc_mkdir("dri", NULL);
	if (!drm_proc_root) {
		DRM_ERROR("Cannot create /proc/dri\n");
		ret = -1;
		goto err_p3;
	}

	DRM_INFO("Initialized %s %d.%d.%d %s\n",
		 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
	return 0;
      err_p3:
	drm_sysfs_destroy(drm_class);
      err_p2:
	unregister_chrdev(DRM_MAJOR, "drm");
	drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
      err_p1:
	return ret;
}

static void __exit drm_core_exit(void)
{
	remove_proc_entry("dri", NULL);
	drm_sysfs_destroy(drm_class);

	unregister_chrdev(DRM_MAJOR, "drm");

	drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
}

module_init(drm_core_init);
module_exit(drm_core_exit);

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

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

	version.version_major = dev->driver->major;
	version.version_minor = dev->driver->minor;
	version.version_patchlevel = dev->driver->patchlevel;
	DRM_COPY(version.name, dev->driver->name);
	DRM_COPY(version.date, dev->driver->date);
	DRM_COPY(version.desc, dev->driver->desc);

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

/**
 * Called whenever a process performs an ioctl on /dev/drm.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or negative number on failure.
 *
 * Looks up the ioctl function in the ::ioctls table, checking for root
 * previleges if so required, and dispatches to the respective function.
 */
int drm_ioctl(struct inode *inode, struct file *filp,
	      unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_ioctl_desc_t *ioctl;
	drm_ioctl_t *func;
	unsigned int nr = DRM_IOCTL_NR(cmd);
	int retcode = -EINVAL;

	atomic_inc(&dev->ioctl_count);
	atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
	++priv->ioctl_count;

	DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
		  current->pid, cmd, nr,
		  (long)old_encode_dev(priv->head->device),
		  priv->authenticated);

	if (nr < DRIVER_IOCTL_COUNT)
		ioctl = &drm_ioctls[nr];
	else if ((nr >= DRM_COMMAND_BASE)
		 && (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
		ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
	else
		goto err_i1;

	func = ioctl->func;
	/* is there a local override? */
	if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
		func = dev->driver->dma_ioctl;

	if (!func) {
		DRM_DEBUG("no function\n");
		retcode = -EINVAL;
	} else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
		   ((ioctl->flags & DRM_AUTH) && !priv->authenticated) ||
		   ((ioctl->flags & DRM_MASTER) && !priv->master)) {
		retcode = -EACCES;
	} else {
		retcode = func(inode, filp, cmd, arg);
	}

      err_i1:
	atomic_dec(&dev->ioctl_count);
	if (retcode)
		DRM_DEBUG("ret = %x\n", retcode);
	return retcode;
}

EXPORT_SYMBOL(drm_ioctl);
Commit	Line	Data
1da177e4	1	/**
b5e89ed5	2	* \file drm_drv.c
1da177e4 LT	3	* Generic driver template
	4	*
	5	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	6	* \author Gareth Hughes <gareth@valinux.com>
	7	*
	8	* To use this template, you must at least define the following (samples
	9	* given for the MGA driver):
	10	*
	11	* \code
	12	* #define DRIVER_AUTHOR "VA Linux Systems, Inc."
	13	*
	14	* #define DRIVER_NAME "mga"
	15	* #define DRIVER_DESC "Matrox G200/G400"
	16	* #define DRIVER_DATE "20001127"
	17	*
	18	* #define DRIVER_IOCTL_COUNT DRM_ARRAY_SIZE( mga_ioctls )
	19	*
	20	* #define drm_x mga_##x
	21	* \endcode
	22	*/
	23
	24	/*
	25	* Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
	26	*
	27	* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
	28	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	29	* All Rights Reserved.
	30	*
	31	* Permission is hereby granted, free of charge, to any person obtaining a
	32	* copy of this software and associated documentation files (the "Software"),
	33	* to deal in the Software without restriction, including without limitation
	34	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	35	* and/or sell copies of the Software, and to permit persons to whom the
	36	* Software is furnished to do so, subject to the following conditions:
	37	*
	38	* The above copyright notice and this permission notice (including the next
	39	* paragraph) shall be included in all copies or substantial portions of the
	40	* Software.
	41	*
	42	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	43	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	44	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	45	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	46	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	47	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	48	* OTHER DEALINGS IN THE SOFTWARE.
	49	*/
	50
	51	#include "drmP.h"
	52	#include "drm_core.h"
	53
c94f7029 DA	54	static int drm_version(struct inode inode, struct file filp,
	55	unsigned int cmd, unsigned long arg);
	56
1da177e4	57	/** Ioctl table */
b5e89ed5	58	static drm_ioctl_desc_t drm_ioctls[] = {
a7a2cc31 DA	59	[DRM_IOCTL_NR(DRM_IOCTL_VERSION)] = {drm_version, 0},
	60	[DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)] = {drm_getunique, 0},
	61	[DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)] = {drm_getmagic, 0},
	62	[DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)] = {drm_irq_by_busid, DRM_MASTER\|DRM_ROOT_ONLY},
	63	[DRM_IOCTL_NR(DRM_IOCTL_GET_MAP)] = {drm_getmap, 0},
	64	[DRM_IOCTL_NR(DRM_IOCTL_GET_CLIENT)] = {drm_getclient, 0},
	65	[DRM_IOCTL_NR(DRM_IOCTL_GET_STATS)] = {drm_getstats, 0},
	66	[DRM_IOCTL_NR(DRM_IOCTL_SET_VERSION)] = {drm_setversion, DRM_MASTER\|DRM_ROOT_ONLY},
	67	[DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = {drm_setunique, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	68	[DRM_IOCTL_NR(DRM_IOCTL_BLOCK)] = {drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	69	[DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)] = {drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	70	[DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)] = {drm_authmagic, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	71
	72	[DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)] = {drm_addmap_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	73	[DRM_IOCTL_NR(DRM_IOCTL_RM_MAP)] = {drm_rmmap_ioctl, DRM_AUTH},
	74
	75	[DRM_IOCTL_NR(DRM_IOCTL_SET_SAREA_CTX)] = {drm_setsareactx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	76	[DRM_IOCTL_NR(DRM_IOCTL_GET_SAREA_CTX)] = {drm_getsareactx, DRM_AUTH},
	77
11bab7d2 DA	78	[DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)] = {drm_addctx, DRM_AUTH\|DRM_ROOT_ONLY},
11bab7d2 DA	79	[DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)] = {drm_rmctx, DRM_AUTH\|DRM_ROOT_ONLY},
a7a2cc31 DA	80	[DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)] = {drm_modctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	81	[DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)] = {drm_getctx, DRM_AUTH},
	82	[DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = {drm_switchctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	83	[DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)] = {drm_newctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	84	[DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)] = {drm_resctx, DRM_AUTH},
	85
	86	[DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)] = {drm_adddraw, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	87	[DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)] = {drm_rmdraw, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	88
	89	[DRM_IOCTL_NR(DRM_IOCTL_LOCK)] = {drm_lock, DRM_AUTH},
	90	[DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)] = {drm_unlock, DRM_AUTH},
	91
	92	[DRM_IOCTL_NR(DRM_IOCTL_FINISH)] = {drm_noop, DRM_AUTH},
	93
	94	[DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)] = {drm_addbufs, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	95	[DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)] = {drm_markbufs, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	96	[DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)] = {drm_infobufs, DRM_AUTH},
	97	[DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)] = {drm_mapbufs, DRM_AUTH},
	98	[DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)] = {drm_freebufs, DRM_AUTH},
1da177e4	99	/* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
a7a2cc31	100	[DRM_IOCTL_NR(DRM_IOCTL_DMA)] = {NULL, DRM_AUTH},
1da177e4	101
a7a2cc31	102	[DRM_IOCTL_NR(DRM_IOCTL_CONTROL)] = {drm_control, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
1da177e4 LT	103
1da177e4 LT	104	#if __OS_HAS_AGP
a7a2cc31 DA	105	[DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = {drm_agp_acquire_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	106	[DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = {drm_agp_release_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	107	[DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)] = {drm_agp_enable_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	108	[DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)] = {drm_agp_info_ioctl, DRM_AUTH},
	109	[DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)] = {drm_agp_alloc_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	110	[DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)] = {drm_agp_free_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	111	[DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)] = {drm_agp_bind_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
	112	[DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)] = {drm_agp_unbind_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
1da177e4 LT	113	#endif
1da177e4 LT	114
a7a2cc31 DA	115	[DRM_IOCTL_NR(DRM_IOCTL_SG_ALLOC)] = {drm_sg_alloc, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
a7a2cc31 DA	116	[DRM_IOCTL_NR(DRM_IOCTL_SG_FREE)] = {drm_sg_free, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY},
1da177e4	117
a7a2cc31	118	[DRM_IOCTL_NR(DRM_IOCTL_WAIT_VBLANK)] = {drm_wait_vblank, 0},
1da177e4 LT	119	};
1da177e4 LT	120
3d77461e	121	#define DRIVER_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
1da177e4 LT	122
	123	/**
	124	* Take down the DRM device.
	125	*
	126	* \param dev DRM device structure.
	127	*
	128	* Frees every resource in \p dev.
	129	*
aff138ab	130	* \sa drm_device
1da177e4	131	*/
22eae947	132	int drm_lastclose(drm_device_t * dev)
1da177e4 LT	133	{
1da177e4 LT	134	drm_magic_entry_t pt, next;
1da177e4	135	drm_map_list_t *r_list;
1da177e4 LT	136	drm_vma_entry_t vma, vma_next;
	137	int i;
	138
b5e89ed5	139	DRM_DEBUG("\n");
1da177e4	140
22eae947 DA	141	if (dev->driver->lastclose)
	142	dev->driver->lastclose(dev);
	143	DRM_DEBUG("driver lastclose completed\n");
1da177e4 LT	144
	145	if (dev->unique) {
	146	drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
	147	dev->unique = NULL;
	148	dev->unique_len = 0;
	149	}
	150
b5e89ed5 DA	151	if (dev->irq_enabled)
b5e89ed5 DA	152	drm_irq_uninstall(dev);
1da177e4	153
30e2fb18	154	mutex_lock(&dev->struct_mutex);
b5e89ed5	155	del_timer(&dev->timer);
1da177e4	156
b5e89ed5	157	/* Clear pid list */
8669cbc5 TH	158	list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
	159	list_del(&pt->head);
	160	drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
	161	drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
1da177e4 LT	162	}
1da177e4 LT	163
b5e89ed5	164	/* Clear AGP information */
1da177e4 LT	165	if (drm_core_has_AGP(dev) && dev->agp) {
	166	drm_agp_mem_t *entry;
	167	drm_agp_mem_t *nexte;
	168
b5e89ed5 DA	169	/* Remove AGP resources, but leave dev->agp
	170	intact until drv_cleanup is called. */
	171	for (entry = dev->agp->memory; entry; entry = nexte) {
1da177e4	172	nexte = entry->next;
b5e89ed5 DA	173	if (entry->bound)
	174	drm_unbind_agp(entry->memory);
	175	drm_free_agp(entry->memory, entry->pages);
	176	drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
1da177e4 LT	177	}
	178	dev->agp->memory = NULL;
	179
7ab98401	180	if (dev->agp->acquired)
b5e89ed5	181	drm_agp_release(dev);
1da177e4 LT	182
1da177e4 LT	183	dev->agp->acquired = 0;
b5e89ed5	184	dev->agp->enabled = 0;
1da177e4	185	}
836cf046 DA	186	if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
	187	drm_sg_cleanup(dev->sg);
	188	dev->sg = NULL;
	189	}
1da177e4	190
b5e89ed5 DA	191	/* Clear vma list (only built for debugging) */
	192	if (dev->vmalist) {
	193	for (vma = dev->vmalist; vma; vma = vma_next) {
1da177e4	194	vma_next = vma->next;
b5e89ed5	195	drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
1da177e4 LT	196	}
	197	dev->vmalist = NULL;
	198	}
	199
b5e89ed5	200	if (dev->maplist) {
836cf046 DA	201	while (!list_empty(&dev->maplist->head)) {
	202	struct list_head *list = dev->maplist->head.next;
	203	r_list = list_entry(list, drm_map_list_t, head);
	204	drm_rmmap_locked(dev, r_list->map);
	205	}
b5e89ed5 DA	206	}
	207
	208	if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
	209	for (i = 0; i < dev->queue_count; i++) {
	210	if (dev->queuelist[i]) {
	211	drm_free(dev->queuelist[i],
	212	sizeof(*dev->queuelist[0]),
	213	DRM_MEM_QUEUES);
1da177e4 LT	214	dev->queuelist[i] = NULL;
	215	}
	216	}
b5e89ed5 DA	217	drm_free(dev->queuelist,
	218	dev->queue_slots * sizeof(*dev->queuelist),
	219	DRM_MEM_QUEUES);
1da177e4 LT	220	dev->queuelist = NULL;
	221	}
	222	dev->queue_count = 0;
	223
	224	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
b5e89ed5	225	drm_dma_takedown(dev);
1da177e4	226
b5e89ed5 DA	227	if (dev->lock.hw_lock) {
b5e89ed5 DA	228	dev->sigdata.lock = dev->lock.hw_lock = NULL; /* SHM removed */
1da177e4	229	dev->lock.filp = NULL;
b5e89ed5	230	wake_up_interruptible(&dev->lock.lock_queue);
1da177e4	231	}
30e2fb18	232	mutex_unlock(&dev->struct_mutex);
1da177e4	233
22eae947	234	DRM_DEBUG("lastclose completed\n");
1da177e4 LT	235	return 0;
	236	}
	237
1da177e4 LT	238	/**
	239	* Module initialization. Called via init_module at module load time, or via
	240	* linux/init/main.c (this is not currently supported).
	241	*
	242	* \return zero on success or a negative number on failure.
	243	*
	244	* Initializes an array of drm_device structures, and attempts to
	245	* initialize all available devices, using consecutive minors, registering the
	246	* stubs and initializing the AGP device.
b5e89ed5	247	*
1da177e4 LT	248	* Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
	249	* after the initialization for driver customization.
	250	*/
b5e89ed5	251	int drm_init(struct drm_driver *driver)
1da177e4 LT	252	{
	253	struct pci_dev *pdev = NULL;
	254	struct pci_device_id *pid;
	255	int i;
	256
b5e89ed5	257	DRM_DEBUG("\n");
1da177e4 LT	258
	259	drm_mem_init();
	260
b5e89ed5	261	for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
1da177e4	262	pid = (struct pci_device_id *)&driver->pci_driver.id_table[i];
b5e89ed5 DA	263
	264	pdev = NULL;
	265	/* pass back in pdev to account for multiple identical cards */
	266	while ((pdev =
	267	pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
	268	pid->subdevice, pdev)) != NULL) {
1da177e4 LT	269	/* stealth mode requires a manual probe */
	270	pci_dev_get(pdev);
	271	drm_get_dev(pdev, pid, driver);
	272	}
	273	}
	274	return 0;
	275	}
b5e89ed5	276
1da177e4 LT	277	EXPORT_SYMBOL(drm_init);
	278
	279	/**
	280	* Called via cleanup_module() at module unload time.
	281	*
22eae947	282	* Cleans up all DRM device, calling drm_lastclose().
b5e89ed5	283	*
aff138ab	284	* \sa drm_init
1da177e4	285	*/
b5e89ed5	286	static void drm_cleanup(drm_device_t * dev)
1da177e4	287	{
b5e89ed5	288	DRM_DEBUG("\n");
1da177e4 LT	289
	290	if (!dev) {
	291	DRM_ERROR("cleanup called no dev\n");
	292	return;
	293	}
	294
22eae947	295	drm_lastclose(dev);
1da177e4	296
836cf046 DA	297	if (dev->maplist) {
	298	drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
	299	dev->maplist = NULL;
	300	}
	301
b5e89ed5 DA	302	drm_ctxbitmap_cleanup(dev);
b5e89ed5 DA	303
1da177e4 LT	304	if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
	305	dev->agp && dev->agp->agp_mtrr >= 0) {
	306	int retval;
b5e89ed5 DA	307	retval = mtrr_del(dev->agp->agp_mtrr,
	308	dev->agp->agp_info.aper_base,
	309	dev->agp->agp_info.aper_size * 1024 * 1024);
	310	DRM_DEBUG("mtrr_del=%d\n", retval);
1da177e4	311	}
b5e89ed5 DA	312
	313	if (drm_core_has_AGP(dev) && dev->agp) {
	314	drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
1da177e4 LT	315	dev->agp = NULL;
	316	}
	317
22eae947 DA	318	if (dev->driver->unload)
22eae947 DA	319	dev->driver->unload(dev);
b5e89ed5	320
1da177e4	321	drm_put_head(&dev->primary);
b5e89ed5 DA	322	if (drm_put_dev(dev))
b5e89ed5 DA	323	DRM_ERROR("Cannot unload module\n");
1da177e4 LT	324	}
1da177e4 LT	325
b5e89ed5	326	void drm_exit(struct drm_driver *driver)
1da177e4 LT	327	{
	328	int i;
	329	drm_device_t *dev = NULL;
	330	drm_head_t *head;
b5e89ed5 DA	331
b5e89ed5 DA	332	DRM_DEBUG("\n");
1da177e4 LT	333
	334	for (i = 0; i < drm_cards_limit; i++) {
	335	head = drm_heads[i];
	336	if (!head)
	337	continue;
	338	if (!head->dev)
	339	continue;
b5e89ed5	340	if (head->dev->driver != driver)
1da177e4	341	continue;
b5e89ed5	342	dev = head->dev;
aab8df14 DA	343	if (dev) {
	344	/* release the pci driver */
	345	if (dev->pdev)
	346	pci_dev_put(dev->pdev);
	347	drm_cleanup(dev);
	348	}
1da177e4	349	}
b5e89ed5	350	DRM_INFO("Module unloaded\n");
1da177e4	351	}
b5e89ed5	352
1da177e4 LT	353	EXPORT_SYMBOL(drm_exit);
	354
	355	/** File operations structure */
	356	static struct file_operations drm_stub_fops = {
	357	.owner = THIS_MODULE,
b5e89ed5	358	.open = drm_stub_open
1da177e4 LT	359	};
	360
	361	static int __init drm_core_init(void)
	362	{
	363	int ret = -ENOMEM;
b5e89ed5 DA	364
	365	drm_cards_limit =
	366	(drm_cards_limit <
	367	DRM_MAX_MINOR + 1 ? drm_cards_limit : DRM_MAX_MINOR + 1);
	368	drm_heads =
	369	drm_calloc(drm_cards_limit, sizeof(*drm_heads), DRM_MEM_STUB);
	370	if (!drm_heads)
1da177e4	371	goto err_p1;
b5e89ed5	372
1da177e4 LT	373	if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
1da177e4 LT	374	goto err_p1;
b5e89ed5	375
1da177e4 LT	376	drm_class = drm_sysfs_create(THIS_MODULE, "drm");
1da177e4 LT	377	if (IS_ERR(drm_class)) {
b5e89ed5	378	printk(KERN_ERR "DRM: Error creating drm class.\n");
1da177e4 LT	379	ret = PTR_ERR(drm_class);
	380	goto err_p2;
	381	}
	382
66600221	383	drm_proc_root = proc_mkdir("dri", NULL);
1da177e4 LT	384	if (!drm_proc_root) {
	385	DRM_ERROR("Cannot create /proc/dri\n");
	386	ret = -1;
	387	goto err_p3;
	388	}
b5e89ed5 DA	389
	390	DRM_INFO("Initialized %s %d.%d.%d %s\n",
	391	CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
1da177e4	392	return 0;
b5e89ed5	393	err_p3:
1da177e4	394	drm_sysfs_destroy(drm_class);
b5e89ed5	395	err_p2:
1da177e4 LT	396	unregister_chrdev(DRM_MAJOR, "drm");
1da177e4 LT	397	drm_free(drm_heads, sizeof(drm_heads) drm_cards_limit, DRM_MEM_STUB);
b5e89ed5	398	err_p1:
1da177e4 LT	399	return ret;
	400	}
	401
b5e89ed5	402	static void __exit drm_core_exit(void)
1da177e4 LT	403	{
	404	remove_proc_entry("dri", NULL);
	405	drm_sysfs_destroy(drm_class);
	406
	407	unregister_chrdev(DRM_MAJOR, "drm");
	408
b5e89ed5	409	drm_free(drm_heads, sizeof(drm_heads) drm_cards_limit, DRM_MEM_STUB);
1da177e4 LT	410	}
1da177e4 LT	411
b5e89ed5 DA	412	module_init(drm_core_init);
b5e89ed5 DA	413	module_exit(drm_core_exit);
1da177e4 LT	414
	415	/**
	416	* Get version information
	417	*
	418	* \param inode device inode.
	419	* \param filp file pointer.
	420	* \param cmd command.
	421	* \param arg user argument, pointing to a drm_version structure.
	422	* \return zero on success or negative number on failure.
	423	*
	424	* Fills in the version information in \p arg.
	425	*/
b5e89ed5 DA	426	static int drm_version(struct inode inode, struct file filp,
b5e89ed5 DA	427	unsigned int cmd, unsigned long arg)
1da177e4 LT	428	{
	429	drm_file_t *priv = filp->private_data;
	430	drm_device_t *dev = priv->head->dev;
	431	drm_version_t __user argp = (void __user )arg;
	432	drm_version_t version;
22eae947	433	int len;
1da177e4	434
b5e89ed5	435	if (copy_from_user(&version, argp, sizeof(version)))
1da177e4 LT	436	return -EFAULT;
1da177e4 LT	437
22eae947 DA	438	version.version_major = dev->driver->major;
	439	version.version_minor = dev->driver->minor;
	440	version.version_patchlevel = dev->driver->patchlevel;
	441	DRM_COPY(version.name, dev->driver->name);
	442	DRM_COPY(version.date, dev->driver->date);
	443	DRM_COPY(version.desc, dev->driver->desc);
b5e89ed5 DA	444
b5e89ed5 DA	445	if (copy_to_user(argp, &version, sizeof(version)))
1da177e4 LT	446	return -EFAULT;
	447	return 0;
	448	}
	449
b5e89ed5	450	/**
1da177e4 LT	451	* Called whenever a process performs an ioctl on /dev/drm.
	452	*
	453	* \param inode device inode.
	454	* \param filp file pointer.
	455	* \param cmd command.
	456	* \param arg user argument.
	457	* \return zero on success or negative number on failure.
	458	*
	459	* Looks up the ioctl function in the ::ioctls table, checking for root
	460	* previleges if so required, and dispatches to the respective function.
	461	*/
b5e89ed5 DA	462	int drm_ioctl(struct inode inode, struct file filp,
b5e89ed5 DA	463	unsigned int cmd, unsigned long arg)
1da177e4 LT	464	{
	465	drm_file_t *priv = filp->private_data;
	466	drm_device_t *dev = priv->head->dev;
	467	drm_ioctl_desc_t *ioctl;
	468	drm_ioctl_t *func;
	469	unsigned int nr = DRM_IOCTL_NR(cmd);
	470	int retcode = -EINVAL;
	471
b5e89ed5 DA	472	atomic_inc(&dev->ioctl_count);
b5e89ed5 DA	473	atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
1da177e4 LT	474	++priv->ioctl_count;
1da177e4 LT	475
b5e89ed5 DA	476	DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
	477	current->pid, cmd, nr,
	478	(long)old_encode_dev(priv->head->device),
	479	priv->authenticated);
	480
1da177e4 LT	481	if (nr < DRIVER_IOCTL_COUNT)
1da177e4 LT	482	ioctl = &drm_ioctls[nr];
b5e89ed5 DA	483	else if ((nr >= DRM_COMMAND_BASE)
b5e89ed5 DA	484	&& (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
1da177e4 LT	485	ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
	486	else
	487	goto err_i1;
b5e89ed5	488
1da177e4 LT	489	func = ioctl->func;
	490	/* is there a local override? */
	491	if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
	492	func = dev->driver->dma_ioctl;
b5e89ed5 DA	493
	494	if (!func) {
	495	DRM_DEBUG("no function\n");
1da177e4	496	retcode = -EINVAL;
a7a2cc31 DA	497	} else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) \|\|
	498	((ioctl->flags & DRM_AUTH) && !priv->authenticated) \|\|
	499	((ioctl->flags & DRM_MASTER) && !priv->master)) {
1da177e4 LT	500	retcode = -EACCES;
1da177e4 LT	501	} else {
b5e89ed5	502	retcode = func(inode, filp, cmd, arg);
1da177e4	503	}
b5e89ed5 DA	504
	505	err_i1:
	506	atomic_dec(&dev->ioctl_count);
	507	if (retcode)
	508	DRM_DEBUG("ret = %x\n", retcode);
1da177e4 LT	509	return retcode;
1da177e4 LT	510	}
1da177e4	511
b5e89ed5	512	EXPORT_SYMBOL(drm_ioctl);