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/* drm_auth.h -- IOCTLs for authentication -*- linux-c -*-

 * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com

 *

 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.

 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR

 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 *

 * Authors:

 *    Rickard E. (Rik) Faith <faith@valinux.com>

 *    Gareth Hughes <gareth@valinux.com>

 */

#include "drmP.h"

static int DRM(hash_magic)(drm_magic_t magic)

{

        return magic & (DRM_HASH_SIZE-1);

}

static drm_file_t *DRM(find_file)(drm_device_t *dev, drm_magic_t magic)

{

        drm_file_t        *retval = NULL;

        drm_magic_entry_t *pt;

        int               hash    = DRM(hash_magic)(magic);

        down(&dev->struct_sem);

        for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {

                if (pt->magic == magic) {

                        retval = pt->priv;

                        break;

                }

        }

        up(&dev->struct_sem);

        return retval;

}

int DRM(add_magic)(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)

{

        int               hash;

        drm_magic_entry_t *entry;

        DRM_DEBUG("%d\n", magic);

        hash         = DRM(hash_magic)(magic);

        entry        = DRM(alloc)(sizeof(*entry), DRM_MEM_MAGIC);

        if (!entry) return -ENOMEM;

        memset(entry, 0, sizeof(*entry));

        entry->magic = magic;

        entry->priv  = priv;

        entry->next  = NULL;

        down(&dev->struct_sem);

        if (dev->magiclist[hash].tail) {

                dev->magiclist[hash].tail->next = entry;

                dev->magiclist[hash].tail       = entry;

        } else {

                dev->magiclist[hash].head       = entry;

                dev->magiclist[hash].tail       = entry;

        }

        up(&dev->struct_sem);

        return 0;

}

int DRM(remove_magic)(drm_device_t *dev, drm_magic_t magic)

{

        drm_magic_entry_t *prev = NULL;

        drm_magic_entry_t *pt;

        int               hash;

        DRM_DEBUG("%d\n", magic);

        hash = DRM(hash_magic)(magic);

        down(&dev->struct_sem);

        for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {

                if (pt->magic == magic) {

                        if (dev->magiclist[hash].head == pt) {

                                dev->magiclist[hash].head = pt->next;

                        }

                        if (dev->magiclist[hash].tail == pt) {

                                dev->magiclist[hash].tail = prev;

                        }

                        if (prev) {

                                prev->next = pt->next;

                        }

                        up(&dev->struct_sem);

                        return 0;

                }

        }

        up(&dev->struct_sem);

        DRM(free)(pt, sizeof(*pt), DRM_MEM_MAGIC);

        return -EINVAL;

}

int DRM(getmagic)(struct inode *inode, struct file *filp,

                  unsigned int cmd, unsigned long arg)

{

        static drm_magic_t sequence = 0;

        static spinlock_t  lock     = SPIN_LOCK_UNLOCKED;

        drm_file_t         *priv    = filp->private_data;

        drm_device_t       *dev     = priv->dev;

        drm_auth_t         auth;

                                /* Find unique magic */

        if (priv->magic) {

                auth.magic = priv->magic;

        } else {

                do {

                        spin_lock(&lock);

                        if (!sequence) ++sequence; /* reserve 0 */

                        auth.magic = sequence++;

                        spin_unlock(&lock);

                } while (DRM(find_file)(dev, auth.magic));

                priv->magic = auth.magic;

                DRM(add_magic)(dev, priv, auth.magic);

        }

        DRM_DEBUG("%u\n", auth.magic);

        if (copy_to_user((drm_auth_t *)arg, &auth, sizeof(auth)))

                return -EFAULT;

        return 0;

}

int DRM(authmagic)(struct inode *inode, struct file *filp,

                   unsigned int cmd, unsigned long arg)

{

        drm_file_t         *priv    = filp->private_data;

        drm_device_t       *dev     = priv->dev;

        drm_auth_t         auth;

        drm_file_t         *file;

        if (copy_from_user(&auth, (drm_auth_t *)arg, sizeof(auth)))

                return -EFAULT;

        DRM_DEBUG("%u\n", auth.magic);

        if ((file = DRM(find_file)(dev, auth.magic))) {

                file->authenticated = 1;

                DRM(remove_magic)(dev, auth.magic);

                return 0;

        }

        return -EINVAL;

}