[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_RENDER_ALLOW),
	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),
	DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma_ioctl, 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_RENDER_ALLOW),
	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_RENDER_ALLOW),
	DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),

	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 )

/**
 * drm_legacy_dev_reinit
 *
 * Reinitializes a legacy/ums drm device in it's lastclose function.
 */
static void drm_legacy_dev_reinit(struct drm_device *dev)
{
	int i;

	if (drm_core_check_feature(dev, DRIVER_MODESET))
		return;

	atomic_set(&dev->ioctl_count, 0);
	atomic_set(&dev->vma_count, 0);

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

	dev->sigdata.lock = NULL;

	dev->context_flag = 0;
	dev->last_context = 0;
	dev->if_version = 0;
}

/**
 * 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_legacy_dev_reinit(dev);

	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();
	drm_connector_ida_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_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)
{
	debugfs_remove(drm_debugfs_root);
	drm_sysfs_destroy();

	unregister_chrdev(DRM_MAJOR, "drm");

	drm_connector_ida_destroy();
	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)) {
		u32 drv_size;

		ioctl = &drm_ioctls[nr];

		drv_size = _IOC_SIZE(ioctl->cmd);
		usize = asize = _IOC_SIZE(cmd);
		if (drv_size > asize)
			asize = drv_size;

		cmd = ioctl->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;

	if (!func) {
		DRM_DEBUG("no function\n");
		retcode = -EINVAL;
	} else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
		   ((ioctl->flags & DRM_AUTH) && !drm_is_render_client(file_priv) && !file_priv->authenticated) ||
		   ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
		   (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL)) ||
		   (!(ioctl->flags & DRM_RENDER_ALLOW) && drm_is_render_client(file_priv))) {
		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),
1793126f	71	DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED\|DRM_RENDER_ALLOW),
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),
6eb9278a	109	DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma_ioctl, DRM_AUTH),
1da177e4	110
c153f45f	111	DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
1da177e4 LT	112
1da177e4 LT	113	#if __OS_HAS_AGP
c153f45f EA	114	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	115	DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	116	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	117	DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
	118	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	119	DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	120	DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
	121	DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
1da177e4 LT	122	#endif
1da177e4 LT	123
1d8d29cf	124	DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
c153f45f	125	DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
1da177e4	126
8f4ff2b0	127	DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
bea5679f	128
0a3e67a4 JB	129	DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
0a3e67a4 JB	130
8f879194	131	DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH\|DRM_MASTER\|DRM_ROOT_ONLY),
673a394b	132
1793126f	133	DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED\|DRM_RENDER_ALLOW),
9a1420d1 DA	134	DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH\|DRM_UNLOCKED),
	135	DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH\|DRM_UNLOCKED),
	136
a14b1b42	137	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
3248877e	138
1793126f DH	139	DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH\|DRM_UNLOCKED\|DRM_RENDER_ALLOW),
1793126f DH	140	DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH\|DRM_UNLOCKED\|DRM_RENDER_ALLOW),
3248877e	141
2216c9e7	142	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
a14b1b42	143	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
9a1420d1	144	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
2216c9e7	145	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
8cf5c917	146	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
9a1420d1	147	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
a14b1b42	148	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
9a1420d1	149	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER\|DRM_UNLOCKED),
a14b1b42 MSB	150	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
a14b1b42 MSB	151	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
c55b6b3d VS	152	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
c55b6b3d VS	153	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
2216c9e7	154	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
9a1420d1	155	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
2216c9e7	156	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
a14b1b42	157	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
fb30edf5 DH	158	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	159	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	160	DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
9a1420d1	161	DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
ff72145b	162	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
fb30edf5 DH	163	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	164	DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
	165	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
2216c9e7	166	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
c543188a	167	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
4c813d4d	168	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER\|DRM_CONTROL_ALLOW\|DRM_UNLOCKED),
1da177e4 LT	169	};
1da177e4 LT	170
0515b93c	171	#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
1da177e4	172
f336ab76 DV	173	/**
	174	* drm_legacy_dev_reinit
	175	*
	176	* Reinitializes a legacy/ums drm device in it's lastclose function.
	177	*/
	178	static void drm_legacy_dev_reinit(struct drm_device *dev)
	179	{
	180	int i;
	181
	182	if (drm_core_check_feature(dev, DRIVER_MODESET))
	183	return;
	184
	185	atomic_set(&dev->ioctl_count, 0);
	186	atomic_set(&dev->vma_count, 0);
	187
	188	for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
	189	atomic_set(&dev->counts[i], 0);
	190
	191	dev->sigdata.lock = NULL;
	192
	193	dev->context_flag = 0;
	194	dev->last_context = 0;
	195	dev->if_version = 0;
	196	}
	197
1da177e4 LT	198	/**
	199	* Take down the DRM device.
	200	*
	201	* \param dev DRM device structure.
	202	*
	203	* Frees every resource in \p dev.
	204	*
aff138ab	205	* \sa drm_device
1da177e4	206	*/
84b1fd10	207	int drm_lastclose(struct drm_device * dev)
1da177e4	208	{
8fc2fdf4	209	struct drm_vma_entry vma, vma_temp;
1da177e4	210
b5e89ed5	211	DRM_DEBUG("\n");
1da177e4	212
22eae947 DA	213	if (dev->driver->lastclose)
	214	dev->driver->lastclose(dev);
	215	DRM_DEBUG("driver lastclose completed\n");
1da177e4	216
f453ba04	217	if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
b5e89ed5	218	drm_irq_uninstall(dev);
1da177e4	219
30e2fb18	220	mutex_lock(&dev->struct_mutex);
d4e2cbe9	221
28ec711c DH	222	drm_agp_clear(dev);
28ec711c DH	223
3d914e83	224	drm_legacy_sg_cleanup(dev);
1da177e4	225
b5e89ed5	226	/* Clear vma list (only built for debugging) */
bd1b331f DA	227	list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
bd1b331f DA	228	list_del(&vma->head);
9a298b2a	229	kfree(vma);
1da177e4 LT	230	}
1da177e4 LT	231
e2e99a82	232	drm_legacy_dma_takedown(dev);
1da177e4	233
a2c0a97b	234	dev->dev_mapping = NULL;
30e2fb18	235	mutex_unlock(&dev->struct_mutex);
1da177e4	236
f336ab76 DV	237	drm_legacy_dev_reinit(dev);
f336ab76 DV	238
22eae947	239	DRM_DEBUG("lastclose completed\n");
1da177e4 LT	240	return 0;
	241	}
	242
1da177e4	243	/** File operations structure */
2b8693c0	244	static const struct file_operations drm_stub_fops = {
1da177e4	245	.owner = THIS_MODULE,
6038f373 AB	246	.open = drm_stub_open,
6038f373 AB	247	.llseek = noop_llseek,
1da177e4 LT	248	};
	249
	250	static int __init drm_core_init(void)
	251	{
	252	int ret = -ENOMEM;
b5e89ed5	253
ba4420c2	254	drm_global_init();
b21e3afe	255	drm_connector_ida_init();
2c14f28b	256	idr_init(&drm_minors_idr);
b5e89ed5	257
1da177e4 LT	258	if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
1da177e4 LT	259	goto err_p1;
b5e89ed5	260
1da177e4 LT	261	drm_class = drm_sysfs_create(THIS_MODULE, "drm");
1da177e4 LT	262	if (IS_ERR(drm_class)) {
b5e89ed5	263	printk(KERN_ERR "DRM: Error creating drm class.\n");
1da177e4 LT	264	ret = PTR_ERR(drm_class);
	265	goto err_p2;
	266	}
	267
955b12de BG	268	drm_debugfs_root = debugfs_create_dir("dri", NULL);
955b12de BG	269	if (!drm_debugfs_root) {
156f5a78	270	DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
955b12de BG	271	ret = -1;
	272	goto err_p3;
	273	}
	274
b5e89ed5 DA	275	DRM_INFO("Initialized %s %d.%d.%d %s\n",
b5e89ed5 DA	276	CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
1da177e4	277	return 0;
e8b962b6 JB	278	err_p3:
	279	drm_sysfs_destroy();
	280	err_p2:
1da177e4	281	unregister_chrdev(DRM_MAJOR, "drm");
2c14f28b DA	282
2c14f28b DA	283	idr_destroy(&drm_minors_idr);
e8b962b6	284	err_p1:
1da177e4 LT	285	return ret;
	286	}
	287
b5e89ed5	288	static void __exit drm_core_exit(void)
1da177e4	289	{
955b12de	290	debugfs_remove(drm_debugfs_root);
e8b962b6	291	drm_sysfs_destroy();
1da177e4 LT	292
	293	unregister_chrdev(DRM_MAJOR, "drm");
	294
b21e3afe	295	drm_connector_ida_destroy();
2c14f28b	296	idr_destroy(&drm_minors_idr);
1da177e4 LT	297	}
1da177e4 LT	298
b5e89ed5 DA	299	module_init(drm_core_init);
b5e89ed5 DA	300	module_exit(drm_core_exit);
1da177e4	301
156822f7 AS	302	/**
	303	* Copy and IOCTL return string to user space
	304	*/
140a45fc AS	305	static int drm_copy_field(char buf, size_t buf_len, const char *value)
	306	{
	307	int len;
	308
	309	/* don't overflow userbuf */
	310	len = strlen(value);
	311	if (len > *buf_len)
	312	len = *buf_len;
	313
	314	/* let userspace know exact length of driver value (which could be
	315	* larger than the userspace-supplied buffer) */
	316	*buf_len = strlen(value);
	317
	318	/* finally, try filling in the userbuf */
	319	if (len && buf)
	320	if (copy_to_user(buf, value, len))
	321	return -EFAULT;
	322	return 0;
	323	}
156822f7	324
1da177e4 LT	325	/**
	326	* Get version information
	327	*
	328	* \param inode device inode.
	329	* \param filp file pointer.
	330	* \param cmd command.
	331	* \param arg user argument, pointing to a drm_version structure.
	332	* \return zero on success or negative number on failure.
	333	*
	334	* Fills in the version information in \p arg.
	335	*/
c153f45f EA	336	static int drm_version(struct drm_device dev, void data,
c153f45f EA	337	struct drm_file *file_priv)
1da177e4	338	{
c153f45f	339	struct drm_version *version = data;
dad07ca7	340	int err;
1da177e4	341
c153f45f EA	342	version->version_major = dev->driver->major;
	343	version->version_minor = dev->driver->minor;
	344	version->version_patchlevel = dev->driver->patchlevel;
dad07ca7 AS	345	err = drm_copy_field(version->name, &version->name_len,
	346	dev->driver->name);
	347	if (!err)
	348	err = drm_copy_field(version->date, &version->date_len,
	349	dev->driver->date);
	350	if (!err)
	351	err = drm_copy_field(version->desc, &version->desc_len,
	352	dev->driver->desc);
	353
	354	return err;
1da177e4 LT	355	}
1da177e4 LT	356
b5e89ed5	357	/**
1da177e4 LT	358	* Called whenever a process performs an ioctl on /dev/drm.
	359	*
	360	* \param inode device inode.
6c340eac	361	* \param file_priv DRM file private.
1da177e4 LT	362	* \param cmd command.
	363	* \param arg user argument.
	364	* \return zero on success or negative number on failure.
	365	*
	366	* Looks up the ioctl function in the ::ioctls table, checking for root
	367	* previleges if so required, and dispatches to the respective function.
	368	*/
ed8b6704	369	long drm_ioctl(struct file *filp,
b5e89ed5	370	unsigned int cmd, unsigned long arg)
1da177e4	371	{
6c340eac	372	struct drm_file *file_priv = filp->private_data;
ed8b6704	373	struct drm_device *dev;
b9434d0f	374	const struct drm_ioctl_desc *ioctl = NULL;
1da177e4 LT	375	drm_ioctl_t *func;
	376	unsigned int nr = DRM_IOCTL_NR(cmd);
	377	int retcode = -EINVAL;
955a23eb	378	char stack_kdata[128];
c153f45f	379	char *kdata = NULL;
1b2f1489	380	unsigned int usize, asize;
1da177e4	381
ed8b6704	382	dev = file_priv->minor->dev;
2c07a21d DA	383
	384	if (drm_device_is_unplugged(dev))
	385	return -ENODEV;
	386
b5e89ed5 DA	387	atomic_inc(&dev->ioctl_count);
b5e89ed5 DA	388	atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
6c340eac	389	++file_priv->ioctl_count;
1da177e4	390
0515b93c	391	if ((nr >= DRM_CORE_IOCTL_COUNT) &&
99da6d86 TH	392	((nr < DRM_COMMAND_BASE) \|\| (nr >= DRM_COMMAND_END)))
99da6d86 TH	393	goto err_i1;
0515b93c	394	if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
1b2f1489 DA	395	(nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
1b2f1489 DA	396	u32 drv_size;
1da177e4	397	ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
1b2f1489 DA	398	drv_size = _IOC_SIZE(ioctl->cmd_drv);
	399	usize = asize = _IOC_SIZE(cmd);
	400	if (drv_size > asize)
	401	asize = drv_size;
e4fda9f2	402	cmd = ioctl->cmd_drv;
1b2f1489	403	}
858a3685	404	else if ((nr >= DRM_COMMAND_END) \|\| (nr < DRM_COMMAND_BASE)) {
b062672e CW	405	u32 drv_size;
b062672e CW	406
99da6d86	407	ioctl = &drm_ioctls[nr];
b062672e CW	408
b062672e CW	409	drv_size = _IOC_SIZE(ioctl->cmd);
1b2f1489	410	usize = asize = _IOC_SIZE(cmd);
b062672e CW	411	if (drv_size > asize)
	412	asize = drv_size;
	413
	414	cmd = ioctl->cmd;
858a3685	415	} else
1da177e4	416	goto err_i1;
b5e89ed5	417
b9434d0f CC	418	DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
	419	task_pid_nr(current),
	420	(long)old_encode_dev(file_priv->minor->device),
	421	file_priv->authenticated, ioctl->name);
	422
41ee2ff4	423	/* Do not trust userspace, use our own definition */
1da177e4	424	func = ioctl->func;
b5e89ed5 DA	425
	426	if (!func) {
	427	DRM_DEBUG("no function\n");
1da177e4	428	retcode = -EINVAL;
a7a2cc31	429	} else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) \|\|
1793126f	430	((ioctl->flags & DRM_AUTH) && !drm_is_render_client(file_priv) && !file_priv->authenticated) \|\|
59738d5c	431	((ioctl->flags & DRM_MASTER) && !file_priv->is_master) \|\|
1793126f DH	432	(!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL)) \|\|
1793126f DH	433	(!(ioctl->flags & DRM_RENDER_ALLOW) && drm_is_render_client(file_priv))) {
1da177e4 LT	434	retcode = -EACCES;
1da177e4 LT	435	} else {
c153f45f	436	if (cmd & (IOC_IN \| IOC_OUT)) {
1b2f1489	437	if (asize <= sizeof(stack_kdata)) {
955a23eb EA	438	kdata = stack_kdata;
955a23eb EA	439	} else {
1b2f1489	440	kdata = kmalloc(asize, GFP_KERNEL);
955a23eb EA	441	if (!kdata) {
	442	retcode = -ENOMEM;
	443	goto err_i1;
	444	}
9d5b3ffc	445	}
dd2351da RC	446	if (asize > usize)
dd2351da RC	447	memset(kdata + usize, 0, asize - usize);
c153f45f EA	448	}
	449
	450	if (cmd & IOC_IN) {
	451	if (copy_from_user(kdata, (void __user *)arg,
1b2f1489	452	usize) != 0) {
9d5b3ffc	453	retcode = -EFAULT;
c153f45f EA	454	goto err_i1;
c153f45f EA	455	}
b9f0aee8	456	} else
1b2f1489	457	memset(kdata, 0, usize);
b9f0aee8	458
ed8b6704 AB	459	if (ioctl->flags & DRM_UNLOCKED)
	460	retcode = func(dev, kdata, file_priv);
	461	else {
58374713	462	mutex_lock(&drm_global_mutex);
ed8b6704	463	retcode = func(dev, kdata, file_priv);
58374713	464	mutex_unlock(&drm_global_mutex);
ed8b6704	465	}
c153f45f	466
9b6fe313	467	if (cmd & IOC_OUT) {
c153f45f	468	if (copy_to_user((void __user *)arg, kdata,
1b2f1489	469	usize) != 0)
9d5b3ffc	470	retcode = -EFAULT;
c153f45f	471	}
1da177e4	472	}
b5e89ed5 DA	473
b5e89ed5 DA	474	err_i1:
b9434d0f CC	475	if (!ioctl)
	476	DRM_DEBUG("invalid iotcl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
	477	task_pid_nr(current),
	478	(long)old_encode_dev(file_priv->minor->device),
	479	file_priv->authenticated, cmd, nr);
	480
955a23eb	481	if (kdata != stack_kdata)
c153f45f	482	kfree(kdata);
b5e89ed5 DA	483	atomic_dec(&dev->ioctl_count);
b5e89ed5 DA	484	if (retcode)
4ef7fe7c	485	DRM_DEBUG("ret = %d\n", retcode);
1da177e4 LT	486	return retcode;
1da177e4 LT	487	}
b5e89ed5	488	EXPORT_SYMBOL(drm_ioctl);