[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpu / 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 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 <linux/debugfs.h>
#include <linux/slab.h>
#include "drmP.h"
#include "drm_core.h"


static int drm_version(struct drm_device *dev, void *data,
		       struct drm_file *file_priv);

/** Ioctl table */
static struct drm_ioctl_desc drm_ioctls[] = {
	DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),

	DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),

	DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
	DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
	DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),

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

	DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

#if __OS_HAS_AGP
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
#endif

	DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0),

	DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),

	DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED)
};

#define DRM_CORE_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(struct drm_device * dev)
{
	struct drm_vma_entry *vma, *vma_temp;
	int i;

	DRM_DEBUG("\n");

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

	if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
		drm_irq_uninstall(dev);

	mutex_lock(&dev->struct_mutex);

	/* Free drawable information memory */
	drm_drawable_free_all(dev);
	del_timer(&dev->timer);

	/* Clear AGP information */
	if (drm_core_has_AGP(dev) && dev->agp &&
			!drm_core_check_feature(dev, DRIVER_MODESET)) {
		struct drm_agp_mem *entry, *tempe;

		/* Remove AGP resources, but leave dev->agp
		   intact until drv_cleanup is called. */
		list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
			if (entry->bound)
				drm_unbind_agp(entry->memory);
			drm_free_agp(entry->memory, entry->pages);
			kfree(entry);
		}
		INIT_LIST_HEAD(&dev->agp->memory);

		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_core_check_feature(dev, DRIVER_MODESET)) {
		drm_sg_cleanup(dev->sg);
		dev->sg = NULL;
	}

	/* Clear vma list (only built for debugging) */
	list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
		list_del(&vma->head);
		kfree(vma);
	}

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

	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
	    !drm_core_check_feature(dev, DRIVER_MODESET))
		drm_dma_takedown(dev);

	dev->dev_mapping = NULL;
	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 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)
{
	DRM_DEBUG("\n");
	INIT_LIST_HEAD(&driver->device_list);

	if (driver->driver_features & DRIVER_USE_PLATFORM_DEVICE)
		return drm_platform_init(driver);
	else
		return drm_pci_init(driver);
}

EXPORT_SYMBOL(drm_init);

void drm_exit(struct drm_driver *driver)
{
	struct drm_device *dev, *tmp;
	DRM_DEBUG("\n");

	if (driver->driver_features & DRIVER_MODESET) {
		pci_unregister_driver(&driver->pci_driver);
	} else {
		list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
			drm_put_dev(dev);
	}

	DRM_INFO("Module unloaded\n");
}

EXPORT_SYMBOL(drm_exit);

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

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

	idr_init(&drm_minors_idr);

	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_debugfs_root = debugfs_create_dir("dri", NULL);
	if (!drm_debugfs_root) {
		DRM_ERROR("Cannot create /sys/kernel/debug/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();
err_p2:
	unregister_chrdev(DRM_MAJOR, "drm");

	idr_destroy(&drm_minors_idr);
err_p1:
	return ret;
}

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

	unregister_chrdev(DRM_MAJOR, "drm");

	idr_destroy(&drm_minors_idr);
}

module_init(drm_core_init);
module_exit(drm_core_exit);

/**
 * Copy and IOCTL return string to user space
 */
static int drm_copy_field(char *buf, size_t *buf_len, const char *value)
{
	int len;

	/* don't overflow userbuf */
	len = strlen(value);
	if (len > *buf_len)
		len = *buf_len;

	/* let userspace know exact length of driver value (which could be
	 * larger than the userspace-supplied buffer) */
	*buf_len = strlen(value);

	/* finally, try filling in the userbuf */
	if (len && buf)
		if (copy_to_user(buf, value, len))
			return -EFAULT;
	return 0;
}

/**
 * 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 drm_device *dev, void *data,
		       struct drm_file *file_priv)
{
	struct drm_version *version = data;
	int err;

	version->version_major = dev->driver->major;
	version->version_minor = dev->driver->minor;
	version->version_patchlevel = dev->driver->patchlevel;
	err = drm_copy_field(version->name, &version->name_len,
			dev->driver->name);
	if (!err)
		err = drm_copy_field(version->date, &version->date_len,
				dev->driver->date);
	if (!err)
		err = drm_copy_field(version->desc, &version->desc_len,
				dev->driver->desc);

	return err;
}

/**
 * Called whenever a process performs an ioctl on /dev/drm.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \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.
 */
long drm_ioctl(struct file *filp,
	      unsigned int cmd, unsigned long arg)
{
	struct drm_file *file_priv = filp->private_data;
	struct drm_device *dev;
	struct drm_ioctl_desc *ioctl;
	drm_ioctl_t *func;
	unsigned int nr = DRM_IOCTL_NR(cmd);
	int retcode = -EINVAL;
	char stack_kdata[128];
	char *kdata = NULL;

	dev = file_priv->minor->dev;
	atomic_inc(&dev->ioctl_count);
	atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
	++file_priv->ioctl_count;

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

	if ((nr >= DRM_CORE_IOCTL_COUNT) &&
	    ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
		goto err_i1;
	if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
	    (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
		ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
	else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
		ioctl = &drm_ioctls[nr];
		cmd = ioctl->cmd;
	} else
		goto err_i1;

	/* Do not trust userspace, use our own definition */
	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) && !file_priv->authenticated) ||
		   ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
		   (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
		retcode = -EACCES;
	} else {
		if (cmd & (IOC_IN | IOC_OUT)) {
			if (_IOC_SIZE(cmd) <= sizeof(stack_kdata)) {
				kdata = stack_kdata;
			} else {
				kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
				if (!kdata) {
					retcode = -ENOMEM;
					goto err_i1;
				}
			}
		}

		if (cmd & IOC_IN) {
			if (copy_from_user(kdata, (void __user *)arg,
					   _IOC_SIZE(cmd)) != 0) {
				retcode = -EFAULT;
				goto err_i1;
			}
		}
		if (ioctl->flags & DRM_UNLOCKED)
			retcode = func(dev, kdata, file_priv);
		else {
			lock_kernel();
			retcode = func(dev, kdata, file_priv);
			unlock_kernel();
		}

		if (cmd & IOC_OUT) {
			if (copy_to_user((void __user *)arg, kdata,
					 _IOC_SIZE(cmd)) != 0)
				retcode = -EFAULT;
		}
	}

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

EXPORT_SYMBOL(drm_ioctl);

struct drm_local_map *drm_getsarea(struct drm_device *dev)
{
	struct drm_map_list *entry;

	list_for_each_entry(entry, &dev->maplist, head) {
		if (entry->map && entry->map->type == _DRM_SHM &&
		    (entry->map->flags & _DRM_CONTAINS_LOCK)) {
			return entry->map;
		}
	}
	return NULL;
}
EXPORT_SYMBOL(drm_getsarea);
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	*
1da177e4 LT	18	* #define drm_x mga_##x
	19	* \endcode
	20	*/
	21
	22	/*
	23	* Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
	24	*
	25	* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
	26	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	27	* All Rights Reserved.
	28	*
	29	* Permission is hereby granted, free of charge, to any person obtaining a
	30	* copy of this software and associated documentation files (the "Software"),
	31	* to deal in the Software without restriction, including without limitation
	32	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	33	* and/or sell copies of the Software, and to permit persons to whom the
	34	* Software is furnished to do so, subject to the following conditions:
	35	*
	36	* The above copyright notice and this permission notice (including the next
	37	* paragraph) shall be included in all copies or substantial portions of the
	38	* Software.
	39	*
	40	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	41	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	42	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	43	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	44	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	45	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	46	* OTHER DEALINGS IN THE SOFTWARE.
	47	*/
	48
955b12de	49	#include <linux/debugfs.h>
5a0e3ad6	50	#include <linux/slab.h>
1da177e4 LT	51	#include "drmP.h"
	52	#include "drm_core.h"
	53
955b12de	54
c153f45f EA	55	static int drm_version(struct drm_device dev, void data,
c153f45f EA	56	struct drm_file *file_priv);
c94f7029	57
1da177e4	58	/** Ioctl table */
c153f45f EA	59	static struct drm_ioctl_desc drm_ioctls[] = {
	60	DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
	61	DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
	62	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
	63	DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER\|DRM_ROOT_ONLY),
	64	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
	65	DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
	66	DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
453a7d46	67	DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
c153f45f EA	68
	69	DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	70	DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	71	DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
453a7d46	72	DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH\|DRM_MASTER),
c153f45f EA	73
	74	DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	75	DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
	76
	77	DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	78	DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
	79
7c1c2871 DA	80	DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
	81	DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
	82
c153f45f EA	83	DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH\|DRM_ROOT_ONLY),
	84	DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	85	DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	86	DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
	87	DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	88	DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	89	DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
	90
	91	DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	92	DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	93
	94	DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
	95	DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
	96
	97	DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
	98
	99	DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	100	DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	101	DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
	102	DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
	103	DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
1da177e4	104	/* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
c153f45f	105	DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
1da177e4	106
c153f45f	107	DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
1da177e4 LT	108
1da177e4 LT	109	#if __OS_HAS_AGP
c153f45f EA	110	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	111	DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	112	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	113	DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
	114	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	115	DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	116	DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	117	DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
1da177e4 LT	118	#endif
1da177e4 LT	119
c153f45f EA	120	DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
c153f45f EA	121	DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
1da177e4	122
c153f45f	123	DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0),
bea5679f	124
0a3e67a4 JB	125	DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
0a3e67a4 JB	126
c153f45f	127	DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
673a394b	128
9a1420d1 DA	129	DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED),
	130	DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH\|DRM_UNLOCKED),
	131	DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH\|DRM_UNLOCKED),
	132
	133	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	134	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	135	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	136	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	137	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER\|DRM_UNLOCKED),
	138	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER\|DRM_UNLOCKED),
	139	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	140	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	141	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	142	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	143	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER \| DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	144	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	145	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	146	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	147	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	148	DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	149	DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	150	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED)
1da177e4 LT	151	};
1da177e4 LT	152
0515b93c	153	#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
1da177e4 LT	154
	155	/**
	156	* Take down the DRM device.
	157	*
	158	* \param dev DRM device structure.
	159	*
	160	* Frees every resource in \p dev.
	161	*
aff138ab	162	* \sa drm_device
1da177e4	163	*/
84b1fd10	164	int drm_lastclose(struct drm_device * dev)
1da177e4	165	{
8fc2fdf4	166	struct drm_vma_entry vma, vma_temp;
1da177e4 LT	167	int i;
1da177e4 LT	168
b5e89ed5	169	DRM_DEBUG("\n");
1da177e4	170
22eae947 DA	171	if (dev->driver->lastclose)
	172	dev->driver->lastclose(dev);
	173	DRM_DEBUG("driver lastclose completed\n");
1da177e4	174
f453ba04	175	if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
b5e89ed5	176	drm_irq_uninstall(dev);
1da177e4	177
30e2fb18	178	mutex_lock(&dev->struct_mutex);
d4e2cbe9 DA	179
	180	/* Free drawable information memory */
	181	drm_drawable_free_all(dev);
b5e89ed5	182	del_timer(&dev->timer);
1da177e4	183
b5e89ed5	184	/* Clear AGP information */
f453ba04	185	if (drm_core_has_AGP(dev) && dev->agp &&
955b12de	186	!drm_core_check_feature(dev, DRIVER_MODESET)) {
55910517	187	struct drm_agp_mem entry, tempe;
1da177e4	188
b5e89ed5 DA	189	/* Remove AGP resources, but leave dev->agp
b5e89ed5 DA	190	intact until drv_cleanup is called. */
bd1b331f	191	list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
b5e89ed5 DA	192	if (entry->bound)
	193	drm_unbind_agp(entry->memory);
	194	drm_free_agp(entry->memory, entry->pages);
9a298b2a	195	kfree(entry);
1da177e4	196	}
bd1b331f	197	INIT_LIST_HEAD(&dev->agp->memory);
1da177e4	198
7ab98401	199	if (dev->agp->acquired)
b5e89ed5	200	drm_agp_release(dev);
1da177e4 LT	201
1da177e4 LT	202	dev->agp->acquired = 0;
b5e89ed5	203	dev->agp->enabled = 0;
1da177e4	204	}
f453ba04 DA	205	if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
f453ba04 DA	206	!drm_core_check_feature(dev, DRIVER_MODESET)) {
836cf046 DA	207	drm_sg_cleanup(dev->sg);
	208	dev->sg = NULL;
	209	}
1da177e4	210
b5e89ed5	211	/* Clear vma list (only built for debugging) */
bd1b331f DA	212	list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
bd1b331f DA	213	list_del(&vma->head);
9a298b2a	214	kfree(vma);
1da177e4 LT	215	}
1da177e4 LT	216
b5e89ed5 DA	217	if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
b5e89ed5 DA	218	for (i = 0; i < dev->queue_count; i++) {
9a298b2a EA	219	kfree(dev->queuelist[i]);
9a298b2a EA	220	dev->queuelist[i] = NULL;
1da177e4	221	}
9a298b2a	222	kfree(dev->queuelist);
1da177e4 LT	223	dev->queuelist = NULL;
	224	}
	225	dev->queue_count = 0;
	226
f453ba04 DA	227	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
f453ba04 DA	228	!drm_core_check_feature(dev, DRIVER_MODESET))
b5e89ed5	229	drm_dma_takedown(dev);
1da177e4	230
a2c0a97b	231	dev->dev_mapping = NULL;
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
dcdb1674	246	* stubs and initializing the 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	252	{
b5e89ed5	253	DRM_DEBUG("\n");
e7f7ab45 DA	254	INIT_LIST_HEAD(&driver->device_list);
e7f7ab45 DA	255
dcdb1674 JC	256	if (driver->driver_features & DRIVER_USE_PLATFORM_DEVICE)
	257	return drm_platform_init(driver);
	258	else
	259	return drm_pci_init(driver);
1da177e4	260	}
b5e89ed5	261
1da177e4 LT	262	EXPORT_SYMBOL(drm_init);
1da177e4 LT	263
2c14f28b DA	264	void drm_exit(struct drm_driver *driver)
2c14f28b DA	265	{
e7f7ab45	266	struct drm_device dev, tmp;
b5e89ed5	267	DRM_DEBUG("\n");
1da177e4	268
112b715e KH	269	if (driver->driver_features & DRIVER_MODESET) {
	270	pci_unregister_driver(&driver->pci_driver);
	271	} else {
	272	list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
	273	drm_put_dev(dev);
	274	}
2c14f28b	275
b5e89ed5	276	DRM_INFO("Module unloaded\n");
1da177e4	277	}
b5e89ed5	278
1da177e4 LT	279	EXPORT_SYMBOL(drm_exit);
	280
	281	/** File operations structure */
2b8693c0	282	static const struct file_operations drm_stub_fops = {
1da177e4	283	.owner = THIS_MODULE,
b5e89ed5	284	.open = drm_stub_open
1da177e4 LT	285	};
	286
	287	static int __init drm_core_init(void)
	288	{
	289	int ret = -ENOMEM;
b5e89ed5	290
2c14f28b	291	idr_init(&drm_minors_idr);
b5e89ed5	292
1da177e4 LT	293	if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
1da177e4 LT	294	goto err_p1;
b5e89ed5	295
1da177e4 LT	296	drm_class = drm_sysfs_create(THIS_MODULE, "drm");
1da177e4 LT	297	if (IS_ERR(drm_class)) {
b5e89ed5	298	printk(KERN_ERR "DRM: Error creating drm class.\n");
1da177e4 LT	299	ret = PTR_ERR(drm_class);
	300	goto err_p2;
	301	}
	302
66600221	303	drm_proc_root = proc_mkdir("dri", NULL);
1da177e4 LT	304	if (!drm_proc_root) {
	305	DRM_ERROR("Cannot create /proc/dri\n");
	306	ret = -1;
	307	goto err_p3;
	308	}
b5e89ed5	309
955b12de BG	310	drm_debugfs_root = debugfs_create_dir("dri", NULL);
955b12de BG	311	if (!drm_debugfs_root) {
156f5a78	312	DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
955b12de BG	313	ret = -1;
	314	goto err_p3;
	315	}
	316
b5e89ed5 DA	317	DRM_INFO("Initialized %s %d.%d.%d %s\n",
b5e89ed5 DA	318	CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
1da177e4	319	return 0;
e8b962b6 JB	320	err_p3:
	321	drm_sysfs_destroy();
	322	err_p2:
1da177e4	323	unregister_chrdev(DRM_MAJOR, "drm");
2c14f28b DA	324
2c14f28b DA	325	idr_destroy(&drm_minors_idr);
e8b962b6	326	err_p1:
1da177e4 LT	327	return ret;
	328	}
	329
b5e89ed5	330	static void __exit drm_core_exit(void)
1da177e4 LT	331	{
1da177e4 LT	332	remove_proc_entry("dri", NULL);
955b12de	333	debugfs_remove(drm_debugfs_root);
e8b962b6	334	drm_sysfs_destroy();
1da177e4 LT	335
	336	unregister_chrdev(DRM_MAJOR, "drm");
	337
2c14f28b	338	idr_destroy(&drm_minors_idr);
1da177e4 LT	339	}
1da177e4 LT	340
b5e89ed5 DA	341	module_init(drm_core_init);
b5e89ed5 DA	342	module_exit(drm_core_exit);
1da177e4	343
156822f7 AS	344	/**
	345	* Copy and IOCTL return string to user space
	346	*/
140a45fc AS	347	static int drm_copy_field(char buf, size_t buf_len, const char *value)
	348	{
	349	int len;
	350
	351	/* don't overflow userbuf */
	352	len = strlen(value);
	353	if (len > *buf_len)
	354	len = *buf_len;
	355
	356	/* let userspace know exact length of driver value (which could be
	357	* larger than the userspace-supplied buffer) */
	358	*buf_len = strlen(value);
	359
	360	/* finally, try filling in the userbuf */
	361	if (len && buf)
	362	if (copy_to_user(buf, value, len))
	363	return -EFAULT;
	364	return 0;
	365	}
156822f7	366
1da177e4 LT	367	/**
	368	* Get version information
	369	*
	370	* \param inode device inode.
	371	* \param filp file pointer.
	372	* \param cmd command.
	373	* \param arg user argument, pointing to a drm_version structure.
	374	* \return zero on success or negative number on failure.
	375	*
	376	* Fills in the version information in \p arg.
	377	*/
c153f45f EA	378	static int drm_version(struct drm_device dev, void data,
c153f45f EA	379	struct drm_file *file_priv)
1da177e4	380	{
c153f45f	381	struct drm_version *version = data;
dad07ca7	382	int err;
1da177e4	383
c153f45f EA	384	version->version_major = dev->driver->major;
	385	version->version_minor = dev->driver->minor;
	386	version->version_patchlevel = dev->driver->patchlevel;
dad07ca7 AS	387	err = drm_copy_field(version->name, &version->name_len,
	388	dev->driver->name);
	389	if (!err)
	390	err = drm_copy_field(version->date, &version->date_len,
	391	dev->driver->date);
	392	if (!err)
	393	err = drm_copy_field(version->desc, &version->desc_len,
	394	dev->driver->desc);
	395
	396	return err;
1da177e4 LT	397	}
1da177e4 LT	398
b5e89ed5	399	/**
1da177e4 LT	400	* Called whenever a process performs an ioctl on /dev/drm.
	401	*
	402	* \param inode device inode.
6c340eac	403	* \param file_priv DRM file private.
1da177e4 LT	404	* \param cmd command.
	405	* \param arg user argument.
	406	* \return zero on success or negative number on failure.
	407	*
	408	* Looks up the ioctl function in the ::ioctls table, checking for root
	409	* previleges if so required, and dispatches to the respective function.
	410	*/
ed8b6704	411	long drm_ioctl(struct file *filp,
b5e89ed5	412	unsigned int cmd, unsigned long arg)
1da177e4	413	{
6c340eac	414	struct drm_file *file_priv = filp->private_data;
ed8b6704	415	struct drm_device *dev;
c153f45f	416	struct drm_ioctl_desc *ioctl;
1da177e4 LT	417	drm_ioctl_t *func;
	418	unsigned int nr = DRM_IOCTL_NR(cmd);
	419	int retcode = -EINVAL;
955a23eb	420	char stack_kdata[128];
c153f45f	421	char *kdata = NULL;
1da177e4	422
ed8b6704	423	dev = file_priv->minor->dev;
b5e89ed5 DA	424	atomic_inc(&dev->ioctl_count);
b5e89ed5 DA	425	atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
6c340eac	426	++file_priv->ioctl_count;
1da177e4	427
b5e89ed5	428	DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
ba25f9dc	429	task_pid_nr(current), cmd, nr,
2c14f28b	430	(long)old_encode_dev(file_priv->minor->device),
6c340eac	431	file_priv->authenticated);
b5e89ed5	432
0515b93c	433	if ((nr >= DRM_CORE_IOCTL_COUNT) &&
99da6d86 TH	434	((nr < DRM_COMMAND_BASE) \|\| (nr >= DRM_COMMAND_END)))
99da6d86 TH	435	goto err_i1;
0515b93c DA	436	if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
0515b93c DA	437	(nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
1da177e4	438	ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
858a3685	439	else if ((nr >= DRM_COMMAND_END) \|\| (nr < DRM_COMMAND_BASE)) {
99da6d86	440	ioctl = &drm_ioctls[nr];
858a3685 DA	441	cmd = ioctl->cmd;
858a3685 DA	442	} else
1da177e4	443	goto err_i1;
b5e89ed5	444
41ee2ff4	445	/* Do not trust userspace, use our own definition */
1da177e4 LT	446	func = ioctl->func;
	447	/* is there a local override? */
	448	if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
	449	func = dev->driver->dma_ioctl;
b5e89ed5 DA	450
	451	if (!func) {
	452	DRM_DEBUG("no function\n");
1da177e4	453	retcode = -EINVAL;
a7a2cc31	454	} else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) \|\|
6c340eac	455	((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) \|\|
59738d5c JB	456	((ioctl->flags & DRM_MASTER) && !file_priv->is_master) \|\|
59738d5c JB	457	(!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
1da177e4 LT	458	retcode = -EACCES;
1da177e4 LT	459	} else {
c153f45f	460	if (cmd & (IOC_IN \| IOC_OUT)) {
955a23eb EA	461	if (_IOC_SIZE(cmd) <= sizeof(stack_kdata)) {
	462	kdata = stack_kdata;
	463	} else {
	464	kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
	465	if (!kdata) {
	466	retcode = -ENOMEM;
	467	goto err_i1;
	468	}
9d5b3ffc	469	}
c153f45f EA	470	}
	471
	472	if (cmd & IOC_IN) {
	473	if (copy_from_user(kdata, (void __user *)arg,
	474	_IOC_SIZE(cmd)) != 0) {
9d5b3ffc	475	retcode = -EFAULT;
c153f45f EA	476	goto err_i1;
	477	}
	478	}
ed8b6704 AB	479	if (ioctl->flags & DRM_UNLOCKED)
	480	retcode = func(dev, kdata, file_priv);
	481	else {
	482	lock_kernel();
	483	retcode = func(dev, kdata, file_priv);
	484	unlock_kernel();
	485	}
c153f45f	486
9b6fe313	487	if (cmd & IOC_OUT) {
c153f45f EA	488	if (copy_to_user((void __user *)arg, kdata,
c153f45f EA	489	_IOC_SIZE(cmd)) != 0)
9d5b3ffc	490	retcode = -EFAULT;
c153f45f	491	}
1da177e4	492	}
b5e89ed5 DA	493
b5e89ed5 DA	494	err_i1:
955a23eb	495	if (kdata != stack_kdata)
c153f45f	496	kfree(kdata);
b5e89ed5 DA	497	atomic_dec(&dev->ioctl_count);
	498	if (retcode)
	499	DRM_DEBUG("ret = %x\n", retcode);
1da177e4 LT	500	return retcode;
1da177e4 LT	501	}
1da177e4	502
b5e89ed5	503	EXPORT_SYMBOL(drm_ioctl);
da509d7a	504
f77d390c	505	struct drm_local_map drm_getsarea(struct drm_device dev)
da509d7a	506	{
55910517	507	struct drm_map_list *entry;
da509d7a	508
6f710105	509	list_for_each_entry(entry, &dev->maplist, head) {
da509d7a DA	510	if (entry->map && entry->map->type == _DRM_SHM &&
	511	(entry->map->flags & _DRM_CONTAINS_LOCK)) {
	512	return entry->map;
	513	}
	514	}
	515	return NULL;
	516	}
	517	EXPORT_SYMBOL(drm_getsarea);