[deliverable/linux.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 <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_core.h>


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

#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
	[DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}

/** Ioctl table */
static const struct drm_ioctl_desc drm_ioctls[] = {
	DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED),
	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, DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED),
	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_noop, 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_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, 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, 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, DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),

	DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, 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_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 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_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, 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_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_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 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_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, 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),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_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;

	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);

	drm_agp_clear(dev);

	drm_legacy_sg_cleanup(dev);

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

	drm_legacy_dma_takedown(dev);

	dev->dev_mapping = NULL;
	mutex_unlock(&dev->struct_mutex);

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

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

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

	drm_global_init();
	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;
	const struct drm_ioctl_desc *ioctl = NULL;
	drm_ioctl_t *func;
	unsigned int nr = DRM_IOCTL_NR(cmd);
	int retcode = -EINVAL;
	char stack_kdata[128];
	char *kdata = NULL;
	unsigned int usize, asize;

	dev = file_priv->minor->dev;

	if (drm_device_is_unplugged(dev))
		return -ENODEV;

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

	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)) {
		u32 drv_size;
		ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
		drv_size = _IOC_SIZE(ioctl->cmd_drv);
		usize = asize = _IOC_SIZE(cmd);
		if (drv_size > asize)
			asize = drv_size;
		cmd = ioctl->cmd_drv;
	}
	else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
		ioctl = &drm_ioctls[nr];
		cmd = ioctl->cmd;
		usize = asize = _IOC_SIZE(cmd);
	} else
		goto err_i1;

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

	/* 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 (asize <= sizeof(stack_kdata)) {
				kdata = stack_kdata;
			} else {
				kdata = kmalloc(asize, GFP_KERNEL);
				if (!kdata) {
					retcode = -ENOMEM;
					goto err_i1;
				}
			}
			if (asize > usize)
				memset(kdata + usize, 0, asize - usize);
		}

		if (cmd & IOC_IN) {
			if (copy_from_user(kdata, (void __user *)arg,
					   usize) != 0) {
				retcode = -EFAULT;
				goto err_i1;
			}
		} else
			memset(kdata, 0, usize);

		if (ioctl->flags & DRM_UNLOCKED)
			retcode = func(dev, kdata, file_priv);
		else {
			mutex_lock(&drm_global_mutex);
			retcode = func(dev, kdata, file_priv);
			mutex_unlock(&drm_global_mutex);
		}

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

      err_i1:
	if (!ioctl)
		DRM_DEBUG("invalid iotcl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
			  task_pid_nr(current),
			  (long)old_encode_dev(file_priv->minor->device),
			  file_priv->authenticated, cmd, nr);

	if (kdata != stack_kdata)
		kfree(kdata);
	atomic_dec(&dev->ioctl_count);
	if (retcode)
		DRM_DEBUG("ret = %d\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	*
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>
2d1a8a48	51	#include <linux/export.h>
760285e7 DH	52	#include <drm/drmP.h>
760285e7 DH	53	#include <drm/drm_core.h>
1da177e4	54
955b12de	55
c153f45f EA	56	static int drm_version(struct drm_device dev, void data,
c153f45f EA	57	struct drm_file *file_priv);
c94f7029	58
1b2f1489	59	#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
b9434d0f	60	[DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}
1b2f1489	61
1da177e4	62	/** Ioctl table */
7d05336b	63	static const struct drm_ioctl_desc drm_ioctls[] = {
53fead96	64	DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED),
c153f45f EA	65	DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
	66	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
	67	DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER\|DRM_ROOT_ONLY),
09b4ea47 IH	68	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
	69	DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
	70	DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
53fead96	71	DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED),
453a7d46	72	DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
c153f45f EA	73
	74	DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	75	DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	76	DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
453a7d46	77	DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH\|DRM_MASTER),
c153f45f EA	78
	79	DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	80	DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
	81
	82	DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	83	DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
	84
7c1c2871 DA	85	DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
	86	DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
	87
c153f45f EA	88	DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH\|DRM_ROOT_ONLY),
c153f45f EA	89	DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
492d774d	90	DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
c153f45f EA	91	DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
	92	DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	93	DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	94	DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
	95
8f879194 DV	96	DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
8f879194 DV	97	DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
c153f45f EA	98
	99	DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
	100	DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
	101
	102	DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
	103
	104	DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	105	DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	106	DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
	107	DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
	108	DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
1da177e4	109	/* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
c153f45f	110	DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
1da177e4	111
c153f45f	112	DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
1da177e4 LT	113
1da177e4 LT	114	#if __OS_HAS_AGP
c153f45f EA	115	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	116	DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	117	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	118	DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
	119	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	120	DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	121	DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	122	DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
1da177e4 LT	123	#endif
1da177e4 LT	124
1d8d29cf	125	DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
c153f45f	126	DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
1da177e4	127
8f4ff2b0	128	DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
bea5679f	129
0a3e67a4 JB	130	DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
0a3e67a4 JB	131
8f879194	132	DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
673a394b	133
9a1420d1 DA	134	DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED),
	135	DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH\|DRM_UNLOCKED),
	136	DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH\|DRM_UNLOCKED),
	137
a14b1b42	138	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
3248877e DA	139
	140	DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH\|DRM_UNLOCKED),
	141	DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH\|DRM_UNLOCKED),
	142
2216c9e7	143	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
a14b1b42	144	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
9a1420d1	145	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
2216c9e7	146	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
8cf5c917	147	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
9a1420d1	148	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
a14b1b42	149	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
9a1420d1	150	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER\|DRM_UNLOCKED),
a14b1b42 MSB	151	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
a14b1b42 MSB	152	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
c55b6b3d VS	153	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
c55b6b3d VS	154	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
2216c9e7	155	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
9a1420d1	156	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
2216c9e7	157	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
a14b1b42	158	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
fb30edf5 DH	159	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	160	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	161	DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
9a1420d1	162	DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
ff72145b	163	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
fb30edf5 DH	164	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	165	DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	166	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
2216c9e7	167	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
c543188a	168	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
4c813d4d	169	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
1da177e4 LT	170	};
1da177e4 LT	171
0515b93c	172	#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
1da177e4 LT	173
	174	/**
	175	* Take down the DRM device.
	176	*
	177	* \param dev DRM device structure.
	178	*
	179	* Frees every resource in \p dev.
	180	*
aff138ab	181	* \sa drm_device
1da177e4	182	*/
84b1fd10	183	int drm_lastclose(struct drm_device * dev)
1da177e4	184	{
8fc2fdf4	185	struct drm_vma_entry vma, vma_temp;
1da177e4	186
b5e89ed5	187	DRM_DEBUG("\n");
1da177e4	188
22eae947 DA	189	if (dev->driver->lastclose)
	190	dev->driver->lastclose(dev);
	191	DRM_DEBUG("driver lastclose completed\n");
1da177e4	192
f453ba04	193	if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
b5e89ed5	194	drm_irq_uninstall(dev);
1da177e4	195
30e2fb18	196	mutex_lock(&dev->struct_mutex);
d4e2cbe9	197
28ec711c DH	198	drm_agp_clear(dev);
28ec711c DH	199
3d914e83	200	drm_legacy_sg_cleanup(dev);
1da177e4	201
b5e89ed5	202	/* Clear vma list (only built for debugging) */
bd1b331f DA	203	list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
bd1b331f DA	204	list_del(&vma->head);
9a298b2a	205	kfree(vma);
1da177e4 LT	206	}
1da177e4 LT	207
e2e99a82	208	drm_legacy_dma_takedown(dev);
1da177e4	209
a2c0a97b	210	dev->dev_mapping = NULL;
30e2fb18	211	mutex_unlock(&dev->struct_mutex);
1da177e4	212
22eae947	213	DRM_DEBUG("lastclose completed\n");
1da177e4 LT	214	return 0;
	215	}
	216
1da177e4	217	/** File operations structure */
2b8693c0	218	static const struct file_operations drm_stub_fops = {
1da177e4	219	.owner = THIS_MODULE,
6038f373 AB	220	.open = drm_stub_open,
6038f373 AB	221	.llseek = noop_llseek,
1da177e4 LT	222	};
	223
	224	static int __init drm_core_init(void)
	225	{
	226	int ret = -ENOMEM;
b5e89ed5	227
ba4420c2	228	drm_global_init();
2c14f28b	229	idr_init(&drm_minors_idr);
b5e89ed5	230
1da177e4 LT	231	if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
1da177e4 LT	232	goto err_p1;
b5e89ed5	233
1da177e4 LT	234	drm_class = drm_sysfs_create(THIS_MODULE, "drm");
1da177e4 LT	235	if (IS_ERR(drm_class)) {
b5e89ed5	236	printk(KERN_ERR "DRM: Error creating drm class.\n");
1da177e4 LT	237	ret = PTR_ERR(drm_class);
	238	goto err_p2;
	239	}
	240
66600221	241	drm_proc_root = proc_mkdir("dri", NULL);
1da177e4 LT	242	if (!drm_proc_root) {
	243	DRM_ERROR("Cannot create /proc/dri\n");
	244	ret = -1;
	245	goto err_p3;
	246	}
b5e89ed5	247
955b12de BG	248	drm_debugfs_root = debugfs_create_dir("dri", NULL);
955b12de BG	249	if (!drm_debugfs_root) {
156f5a78	250	DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
955b12de BG	251	ret = -1;
	252	goto err_p3;
	253	}
	254
b5e89ed5 DA	255	DRM_INFO("Initialized %s %d.%d.%d %s\n",
b5e89ed5 DA	256	CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
1da177e4	257	return 0;
e8b962b6 JB	258	err_p3:
	259	drm_sysfs_destroy();
	260	err_p2:
1da177e4	261	unregister_chrdev(DRM_MAJOR, "drm");
2c14f28b DA	262
2c14f28b DA	263	idr_destroy(&drm_minors_idr);
e8b962b6	264	err_p1:
1da177e4 LT	265	return ret;
	266	}
	267
b5e89ed5	268	static void __exit drm_core_exit(void)
1da177e4 LT	269	{
1da177e4 LT	270	remove_proc_entry("dri", NULL);
955b12de	271	debugfs_remove(drm_debugfs_root);
e8b962b6	272	drm_sysfs_destroy();
1da177e4 LT	273
	274	unregister_chrdev(DRM_MAJOR, "drm");
	275
2c14f28b	276	idr_destroy(&drm_minors_idr);
1da177e4 LT	277	}
1da177e4 LT	278
b5e89ed5 DA	279	module_init(drm_core_init);
b5e89ed5 DA	280	module_exit(drm_core_exit);
1da177e4	281
156822f7 AS	282	/**
	283	* Copy and IOCTL return string to user space
	284	*/
140a45fc AS	285	static int drm_copy_field(char buf, size_t buf_len, const char *value)
	286	{
	287	int len;
	288
	289	/* don't overflow userbuf */
	290	len = strlen(value);
	291	if (len > *buf_len)
	292	len = *buf_len;
	293
	294	/* let userspace know exact length of driver value (which could be
	295	* larger than the userspace-supplied buffer) */
	296	*buf_len = strlen(value);
	297
	298	/* finally, try filling in the userbuf */
	299	if (len && buf)
	300	if (copy_to_user(buf, value, len))
	301	return -EFAULT;
	302	return 0;
	303	}
156822f7	304
1da177e4 LT	305	/**
	306	* Get version information
	307	*
	308	* \param inode device inode.
	309	* \param filp file pointer.
	310	* \param cmd command.
	311	* \param arg user argument, pointing to a drm_version structure.
	312	* \return zero on success or negative number on failure.
	313	*
	314	* Fills in the version information in \p arg.
	315	*/
c153f45f EA	316	static int drm_version(struct drm_device dev, void data,
c153f45f EA	317	struct drm_file *file_priv)
1da177e4	318	{
c153f45f	319	struct drm_version *version = data;
dad07ca7	320	int err;
1da177e4	321
c153f45f EA	322	version->version_major = dev->driver->major;
	323	version->version_minor = dev->driver->minor;
	324	version->version_patchlevel = dev->driver->patchlevel;
dad07ca7 AS	325	err = drm_copy_field(version->name, &version->name_len,
	326	dev->driver->name);
	327	if (!err)
	328	err = drm_copy_field(version->date, &version->date_len,
	329	dev->driver->date);
	330	if (!err)
	331	err = drm_copy_field(version->desc, &version->desc_len,
	332	dev->driver->desc);
	333
	334	return err;
1da177e4 LT	335	}
1da177e4 LT	336
b5e89ed5	337	/**
1da177e4 LT	338	* Called whenever a process performs an ioctl on /dev/drm.
	339	*
	340	* \param inode device inode.
6c340eac	341	* \param file_priv DRM file private.
1da177e4 LT	342	* \param cmd command.
	343	* \param arg user argument.
	344	* \return zero on success or negative number on failure.
	345	*
	346	* Looks up the ioctl function in the ::ioctls table, checking for root
	347	* previleges if so required, and dispatches to the respective function.
	348	*/
ed8b6704	349	long drm_ioctl(struct file *filp,
b5e89ed5	350	unsigned int cmd, unsigned long arg)
1da177e4	351	{
6c340eac	352	struct drm_file *file_priv = filp->private_data;
ed8b6704	353	struct drm_device *dev;
b9434d0f	354	const struct drm_ioctl_desc *ioctl = NULL;
1da177e4 LT	355	drm_ioctl_t *func;
	356	unsigned int nr = DRM_IOCTL_NR(cmd);
	357	int retcode = -EINVAL;
955a23eb	358	char stack_kdata[128];
c153f45f	359	char *kdata = NULL;
1b2f1489	360	unsigned int usize, asize;
1da177e4	361
ed8b6704	362	dev = file_priv->minor->dev;
2c07a21d DA	363
	364	if (drm_device_is_unplugged(dev))
	365	return -ENODEV;
	366
b5e89ed5 DA	367	atomic_inc(&dev->ioctl_count);
b5e89ed5 DA	368	atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
6c340eac	369	++file_priv->ioctl_count;
1da177e4	370
0515b93c	371	if ((nr >= DRM_CORE_IOCTL_COUNT) &&
99da6d86 TH	372	((nr < DRM_COMMAND_BASE) \|\| (nr >= DRM_COMMAND_END)))
99da6d86 TH	373	goto err_i1;
0515b93c	374	if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
1b2f1489 DA	375	(nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
1b2f1489 DA	376	u32 drv_size;
1da177e4	377	ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
1b2f1489 DA	378	drv_size = _IOC_SIZE(ioctl->cmd_drv);
	379	usize = asize = _IOC_SIZE(cmd);
	380	if (drv_size > asize)
	381	asize = drv_size;
e4fda9f2	382	cmd = ioctl->cmd_drv;
1b2f1489	383	}
858a3685	384	else if ((nr >= DRM_COMMAND_END) \|\| (nr < DRM_COMMAND_BASE)) {
99da6d86	385	ioctl = &drm_ioctls[nr];
858a3685	386	cmd = ioctl->cmd;
1b2f1489	387	usize = asize = _IOC_SIZE(cmd);
858a3685	388	} else
1da177e4	389	goto err_i1;
b5e89ed5	390
b9434d0f CC	391	DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
	392	task_pid_nr(current),
	393	(long)old_encode_dev(file_priv->minor->device),
	394	file_priv->authenticated, ioctl->name);
	395
41ee2ff4	396	/* Do not trust userspace, use our own definition */
1da177e4 LT	397	func = ioctl->func;
	398	/* is there a local override? */
	399	if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
	400	func = dev->driver->dma_ioctl;
b5e89ed5 DA	401
	402	if (!func) {
	403	DRM_DEBUG("no function\n");
1da177e4	404	retcode = -EINVAL;
a7a2cc31	405	} else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) \|\|
6c340eac	406	((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) \|\|
59738d5c JB	407	((ioctl->flags & DRM_MASTER) && !file_priv->is_master) \|\|
59738d5c JB	408	(!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
1da177e4 LT	409	retcode = -EACCES;
1da177e4 LT	410	} else {
c153f45f	411	if (cmd & (IOC_IN \| IOC_OUT)) {
1b2f1489	412	if (asize <= sizeof(stack_kdata)) {
955a23eb EA	413	kdata = stack_kdata;
955a23eb EA	414	} else {
1b2f1489	415	kdata = kmalloc(asize, GFP_KERNEL);
955a23eb EA	416	if (!kdata) {
	417	retcode = -ENOMEM;
	418	goto err_i1;
	419	}
9d5b3ffc	420	}
dd2351da RC	421	if (asize > usize)
dd2351da RC	422	memset(kdata + usize, 0, asize - usize);
c153f45f EA	423	}
	424
	425	if (cmd & IOC_IN) {
	426	if (copy_from_user(kdata, (void __user *)arg,
1b2f1489	427	usize) != 0) {
9d5b3ffc	428	retcode = -EFAULT;
c153f45f EA	429	goto err_i1;
c153f45f EA	430	}
b9f0aee8	431	} else
1b2f1489	432	memset(kdata, 0, usize);
b9f0aee8	433
ed8b6704 AB	434	if (ioctl->flags & DRM_UNLOCKED)
	435	retcode = func(dev, kdata, file_priv);
	436	else {
58374713	437	mutex_lock(&drm_global_mutex);
ed8b6704	438	retcode = func(dev, kdata, file_priv);
58374713	439	mutex_unlock(&drm_global_mutex);
ed8b6704	440	}
c153f45f	441
9b6fe313	442	if (cmd & IOC_OUT) {
c153f45f	443	if (copy_to_user((void __user *)arg, kdata,
1b2f1489	444	usize) != 0)
9d5b3ffc	445	retcode = -EFAULT;
c153f45f	446	}
1da177e4	447	}
b5e89ed5 DA	448
b5e89ed5 DA	449	err_i1:
b9434d0f CC	450	if (!ioctl)
	451	DRM_DEBUG("invalid iotcl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
	452	task_pid_nr(current),
	453	(long)old_encode_dev(file_priv->minor->device),
	454	file_priv->authenticated, cmd, nr);
	455
955a23eb	456	if (kdata != stack_kdata)
c153f45f	457	kfree(kdata);
b5e89ed5 DA	458	atomic_dec(&dev->ioctl_count);
b5e89ed5 DA	459	if (retcode)
4ef7fe7c	460	DRM_DEBUG("ret = %d\n", retcode);
1da177e4 LT	461	return retcode;
1da177e4 LT	462	}
b5e89ed5	463	EXPORT_SYMBOL(drm_ioctl);