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frontend.c

/*
 * AGPGART driver frontend
 * Copyright (C) 2004 Silicon Graphics, Inc.
 * Copyright (C) 2002-2003 Dave Jones
 * Copyright (C) 1999 Jeff Hartmann
 * Copyright (C) 1999 Precision Insight, Inc.
 * Copyright (C) 1999 Xi Graphics, Inc.
 *
 * 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 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
 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS 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/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mman.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/agp_backend.h>
#include <linux/agpgart.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include "agp.h"

struct agp_front_data agp_fe;

struct agp_memory *agp_find_mem_by_key(int key)
{
      struct agp_memory *curr;

      if (agp_fe.current_controller == NULL)
            return NULL;

      curr = agp_fe.current_controller->pool;

      while (curr != NULL) {
            if (curr->key == key)
                  break;
            curr = curr->next;
      }

      DBG("key=%d -> mem=%p", key, curr);
      return curr;
}

static void agp_remove_from_pool(struct agp_memory *temp)
{
      struct agp_memory *prev;
      struct agp_memory *next;

      /* Check to see if this is even in the memory pool */

      DBG("mem=%p", temp);
      if (agp_find_mem_by_key(temp->key) != NULL) {
            next = temp->next;
            prev = temp->prev;

            if (prev != NULL) {
                  prev->next = next;
                  if (next != NULL)
                        next->prev = prev;

            } else {
                  /* This is the first item on the list */
                  if (next != NULL)
                        next->prev = NULL;

                  agp_fe.current_controller->pool = next;
            }
      }
}

/*
 * Routines for managing each client's segment list -
 * These routines handle adding and removing segments
 * to each auth'ed client.
 */

static struct
agp_segment_priv *agp_find_seg_in_client(const struct agp_client *client,
                                    unsigned long offset,
                                  int size, pgprot_t page_prot)
{
      struct agp_segment_priv *seg;
      int num_segments, i;
      off_t pg_start;
      size_t pg_count;

      pg_start = offset / 4096;
      pg_count = size / 4096;
      seg = *(client->segments);
      num_segments = client->num_segments;

      for (i = 0; i < client->num_segments; i++) {
            if ((seg[i].pg_start == pg_start) &&
                (seg[i].pg_count == pg_count) &&
                (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) {
                  return seg + i;
            }
      }

      return NULL;
}

static void agp_remove_seg_from_client(struct agp_client *client)
{
      DBG("client=%p", client);

      if (client->segments != NULL) {
            if (*(client->segments) != NULL) {
                  DBG("Freeing %p from client %p", *(client->segments), client);
                  kfree(*(client->segments));
            }
            DBG("Freeing %p from client %p", client->segments, client);
            kfree(client->segments);
            client->segments = NULL;
      }
}

static void agp_add_seg_to_client(struct agp_client *client,
                         struct agp_segment_priv ** seg, int num_segments)
{
      struct agp_segment_priv **prev_seg;

      prev_seg = client->segments;

      if (prev_seg != NULL)
            agp_remove_seg_from_client(client);

      DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client);
      client->num_segments = num_segments;
      client->segments = seg;
}

static pgprot_t agp_convert_mmap_flags(int prot)
{
      unsigned long prot_bits;

      prot_bits = calc_vm_prot_bits(prot) | VM_SHARED;
      return vm_get_page_prot(prot_bits);
}

int agp_create_segment(struct agp_client *client, struct agp_region *region)
{
      struct agp_segment_priv **ret_seg;
      struct agp_segment_priv *seg;
      struct agp_segment *user_seg;
      size_t i;

      seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL);
      if (seg == NULL) {
            kfree(region->seg_list);
            region->seg_list = NULL;
            return -ENOMEM;
      }
      user_seg = region->seg_list;

      for (i = 0; i < region->seg_count; i++) {
            seg[i].pg_start = user_seg[i].pg_start;
            seg[i].pg_count = user_seg[i].pg_count;
            seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot);
      }
      kfree(region->seg_list);
      region->seg_list = NULL;

      ret_seg = kmalloc(sizeof(void *), GFP_KERNEL);
      if (ret_seg == NULL) {
            kfree(seg);
            return -ENOMEM;
      }
      *ret_seg = seg;
      agp_add_seg_to_client(client, ret_seg, region->seg_count);
      return 0;
}

/* End - Routines for managing each client's segment list */

/* This function must only be called when current_controller != NULL */
static void agp_insert_into_pool(struct agp_memory * temp)
{
      struct agp_memory *prev;

      prev = agp_fe.current_controller->pool;

      if (prev != NULL) {
            prev->prev = temp;
            temp->next = prev;
      }
      agp_fe.current_controller->pool = temp;
}


/* File private list routines */

struct agp_file_private *agp_find_private(pid_t pid)
{
      struct agp_file_private *curr;

      curr = agp_fe.file_priv_list;

      while (curr != NULL) {
            if (curr->my_pid == pid)
                  return curr;
            curr = curr->next;
      }

      return NULL;
}

static void agp_insert_file_private(struct agp_file_private * priv)
{
      struct agp_file_private *prev;

      prev = agp_fe.file_priv_list;

      if (prev != NULL)
            prev->prev = priv;
      priv->next = prev;
      agp_fe.file_priv_list = priv;
}

static void agp_remove_file_private(struct agp_file_private * priv)
{
      struct agp_file_private *next;
      struct agp_file_private *prev;

      next = priv->next;
      prev = priv->prev;

      if (prev != NULL) {
            prev->next = next;

            if (next != NULL)
                  next->prev = prev;

      } else {
            if (next != NULL)
                  next->prev = NULL;

            agp_fe.file_priv_list = next;
      }
}

/* End - File flag list routines */

/*
 * Wrappers for agp_free_memory & agp_allocate_memory
 * These make sure that internal lists are kept updated.
 */
void agp_free_memory_wrap(struct agp_memory *memory)
{
      agp_remove_from_pool(memory);
      agp_free_memory(memory);
}

struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type)
{
      struct agp_memory *memory;

      memory = agp_allocate_memory(agp_bridge, pg_count, type);
      if (memory == NULL)
            return NULL;

      agp_insert_into_pool(memory);
      return memory;
}

/* Routines for managing the list of controllers -
 * These routines manage the current controller, and the list of
 * controllers
 */

static struct agp_controller *agp_find_controller_by_pid(pid_t id)
{
      struct agp_controller *controller;

      controller = agp_fe.controllers;

      while (controller != NULL) {
            if (controller->pid == id)
                  return controller;
            controller = controller->next;
      }

      return NULL;
}

static struct agp_controller *agp_create_controller(pid_t id)
{
      struct agp_controller *controller;

      controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL);
      if (controller == NULL)
            return NULL;

      controller->pid = id;
      return controller;
}

static int agp_insert_controller(struct agp_controller *controller)
{
      struct agp_controller *prev_controller;

      prev_controller = agp_fe.controllers;
      controller->next = prev_controller;

      if (prev_controller != NULL)
            prev_controller->prev = controller;

      agp_fe.controllers = controller;

      return 0;
}

static void agp_remove_all_clients(struct agp_controller *controller)
{
      struct agp_client *client;
      struct agp_client *temp;

      client = controller->clients;

      while (client) {
            struct agp_file_private *priv;

            temp = client;
            agp_remove_seg_from_client(temp);
            priv = agp_find_private(temp->pid);

            if (priv != NULL) {
                  clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
                  clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
            }
            client = client->next;
            kfree(temp);
      }
}

static void agp_remove_all_memory(struct agp_controller *controller)
{
      struct agp_memory *memory;
      struct agp_memory *temp;

      memory = controller->pool;

      while (memory) {
            temp = memory;
            memory = memory->next;
            agp_free_memory_wrap(temp);
      }
}

static int agp_remove_controller(struct agp_controller *controller)
{
      struct agp_controller *prev_controller;
      struct agp_controller *next_controller;

      prev_controller = controller->prev;
      next_controller = controller->next;

      if (prev_controller != NULL) {
            prev_controller->next = next_controller;
            if (next_controller != NULL)
                  next_controller->prev = prev_controller;

      } else {
            if (next_controller != NULL)
                  next_controller->prev = NULL;

            agp_fe.controllers = next_controller;
      }

      agp_remove_all_memory(controller);
      agp_remove_all_clients(controller);

      if (agp_fe.current_controller == controller) {
            agp_fe.current_controller = NULL;
            agp_fe.backend_acquired = FALSE;
            agp_backend_release(agp_bridge);
      }
      kfree(controller);
      return 0;
}

static void agp_controller_make_current(struct agp_controller *controller)
{
      struct agp_client *clients;

      clients = controller->clients;

      while (clients != NULL) {
            struct agp_file_private *priv;

            priv = agp_find_private(clients->pid);

            if (priv != NULL) {
                  set_bit(AGP_FF_IS_VALID, &priv->access_flags);
                  set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
            }
            clients = clients->next;
      }

      agp_fe.current_controller = controller;
}

static void agp_controller_release_current(struct agp_controller *controller,
                              struct agp_file_private *controller_priv)
{
      struct agp_client *clients;

      clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags);
      clients = controller->clients;

      while (clients != NULL) {
            struct agp_file_private *priv;

            priv = agp_find_private(clients->pid);

            if (priv != NULL)
                  clear_bit(AGP_FF_IS_VALID, &priv->access_flags);

            clients = clients->next;
      }

      agp_fe.current_controller = NULL;
      agp_fe.used_by_controller = FALSE;
      agp_backend_release(agp_bridge);
}

/*
 * Routines for managing client lists -
 * These routines are for managing the list of auth'ed clients.
 */

static struct agp_client
*agp_find_client_in_controller(struct agp_controller *controller, pid_t id)
{
      struct agp_client *client;

      if (controller == NULL)
            return NULL;

      client = controller->clients;

      while (client != NULL) {
            if (client->pid == id)
                  return client;
            client = client->next;
      }

      return NULL;
}

static struct agp_controller *agp_find_controller_for_client(pid_t id)
{
      struct agp_controller *controller;

      controller = agp_fe.controllers;

      while (controller != NULL) {
            if ((agp_find_client_in_controller(controller, id)) != NULL)
                  return controller;
            controller = controller->next;
      }

      return NULL;
}

struct agp_client *agp_find_client_by_pid(pid_t id)
{
      struct agp_client *temp;

      if (agp_fe.current_controller == NULL)
            return NULL;

      temp = agp_find_client_in_controller(agp_fe.current_controller, id);
      return temp;
}

static void agp_insert_client(struct agp_client *client)
{
      struct agp_client *prev_client;

      prev_client = agp_fe.current_controller->clients;
      client->next = prev_client;

      if (prev_client != NULL)
            prev_client->prev = client;

      agp_fe.current_controller->clients = client;
      agp_fe.current_controller->num_clients++;
}

struct agp_client *agp_create_client(pid_t id)
{
      struct agp_client *new_client;

      new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL);
      if (new_client == NULL)
            return NULL;

      new_client->pid = id;
      agp_insert_client(new_client);
      return new_client;
}

int agp_remove_client(pid_t id)
{
      struct agp_client *client;
      struct agp_client *prev_client;
      struct agp_client *next_client;
      struct agp_controller *controller;

      controller = agp_find_controller_for_client(id);
      if (controller == NULL)
            return -EINVAL;

      client = agp_find_client_in_controller(controller, id);
      if (client == NULL)
            return -EINVAL;

      prev_client = client->prev;
      next_client = client->next;

      if (prev_client != NULL) {
            prev_client->next = next_client;
            if (next_client != NULL)
                  next_client->prev = prev_client;

      } else {
            if (next_client != NULL)
                  next_client->prev = NULL;
            controller->clients = next_client;
      }

      controller->num_clients--;
      agp_remove_seg_from_client(client);
      kfree(client);
      return 0;
}

/* End - Routines for managing client lists */

/* File Operations */

static int agp_mmap(struct file *file, struct vm_area_struct *vma)
{
      unsigned int size, current_size;
      unsigned long offset;
      struct agp_client *client;
      struct agp_file_private *priv = file->private_data;
      struct agp_kern_info kerninfo;

      mutex_lock(&(agp_fe.agp_mutex));

      if (agp_fe.backend_acquired != TRUE)
            goto out_eperm;

      if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags)))
            goto out_eperm;

      agp_copy_info(agp_bridge, &kerninfo);
      size = vma->vm_end - vma->vm_start;
      current_size = kerninfo.aper_size;
      current_size = current_size * 0x100000;
      offset = vma->vm_pgoff << PAGE_SHIFT;
      DBG("%lx:%lx", offset, offset+size);

      if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) {
            if ((size + offset) > current_size)
                  goto out_inval;

            client = agp_find_client_by_pid(current->pid);

            if (client == NULL)
                  goto out_eperm;

            if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot))
                  goto out_inval;

            DBG("client vm_ops=%p", kerninfo.vm_ops);
            if (kerninfo.vm_ops) {
                  vma->vm_ops = kerninfo.vm_ops;
            } else if (io_remap_pfn_range(vma, vma->vm_start,
                        (kerninfo.aper_base + offset) >> PAGE_SHIFT,
                                  size, vma->vm_page_prot)) {
                  goto out_again;
            }
            mutex_unlock(&(agp_fe.agp_mutex));
            return 0;
      }

      if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
            if (size != current_size)
                  goto out_inval;

            DBG("controller vm_ops=%p", kerninfo.vm_ops);
            if (kerninfo.vm_ops) {
                  vma->vm_ops = kerninfo.vm_ops;
            } else if (io_remap_pfn_range(vma, vma->vm_start,
                                  kerninfo.aper_base >> PAGE_SHIFT,
                                  size, vma->vm_page_prot)) {
                  goto out_again;
            }
            mutex_unlock(&(agp_fe.agp_mutex));
            return 0;
      }

out_eperm:
      mutex_unlock(&(agp_fe.agp_mutex));
      return -EPERM;

out_inval:
      mutex_unlock(&(agp_fe.agp_mutex));
      return -EINVAL;

out_again:
      mutex_unlock(&(agp_fe.agp_mutex));
      return -EAGAIN;
}

static int agp_release(struct inode *inode, struct file *file)
{
      struct agp_file_private *priv = file->private_data;

      mutex_lock(&(agp_fe.agp_mutex));

      DBG("priv=%p", priv);

      if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
            struct agp_controller *controller;

            controller = agp_find_controller_by_pid(priv->my_pid);

            if (controller != NULL) {
                  if (controller == agp_fe.current_controller)
                        agp_controller_release_current(controller, priv);
                  agp_remove_controller(controller);
                  controller = NULL;
            }
      }

      if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags))
            agp_remove_client(priv->my_pid);

      agp_remove_file_private(priv);
      kfree(priv);
      file->private_data = NULL;
      mutex_unlock(&(agp_fe.agp_mutex));
      return 0;
}

static int agp_open(struct inode *inode, struct file *file)
{
      int minor = iminor(inode);
      struct agp_file_private *priv;
      struct agp_client *client;
      int rc = -ENXIO;

      mutex_lock(&(agp_fe.agp_mutex));

      if (minor != AGPGART_MINOR)
            goto err_out;

      priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL);
      if (priv == NULL)
            goto err_out_nomem;

      set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags);
      priv->my_pid = current->pid;

      if ((current->uid == 0) || (current->suid == 0)) {
            /* Root priv, can be controller */
            set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags);
      }
      client = agp_find_client_by_pid(current->pid);

      if (client != NULL) {
            set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
            set_bit(AGP_FF_IS_VALID, &priv->access_flags);
      }
      file->private_data = (void *) priv;
      agp_insert_file_private(priv);
      DBG("private=%p, client=%p", priv, client);
      mutex_unlock(&(agp_fe.agp_mutex));
      return 0;

err_out_nomem:
      rc = -ENOMEM;
err_out:
      mutex_unlock(&(agp_fe.agp_mutex));
      return rc;
}


static ssize_t agp_read(struct file *file, char __user *buf,
                  size_t count, loff_t * ppos)
{
      return -EINVAL;
}

static ssize_t agp_write(struct file *file, const char __user *buf,
                   size_t count, loff_t * ppos)
{
      return -EINVAL;
}

static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
{
      struct agp_info userinfo;
      struct agp_kern_info kerninfo;

      agp_copy_info(agp_bridge, &kerninfo);

      userinfo.version.major = kerninfo.version.major;
      userinfo.version.minor = kerninfo.version.minor;
      userinfo.bridge_id = kerninfo.device->vendor |
          (kerninfo.device->device << 16);
      userinfo.agp_mode = kerninfo.mode;
      userinfo.aper_base = kerninfo.aper_base;
      userinfo.aper_size = kerninfo.aper_size;
      userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
      userinfo.pg_used = kerninfo.current_memory;

      if (copy_to_user(arg, &userinfo, sizeof(struct agp_info)))
            return -EFAULT;

      return 0;
}

int agpioc_acquire_wrap(struct agp_file_private *priv)
{
      struct agp_controller *controller;

      DBG("");

      if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags)))
            return -EPERM;

      if (agp_fe.current_controller != NULL)
            return -EBUSY;

      if (!agp_bridge)
            return -ENODEV;

        if (atomic_read(&agp_bridge->agp_in_use))
                return -EBUSY;

      atomic_inc(&agp_bridge->agp_in_use);

      agp_fe.backend_acquired = TRUE;

      controller = agp_find_controller_by_pid(priv->my_pid);

      if (controller != NULL) {
            agp_controller_make_current(controller);
      } else {
            controller = agp_create_controller(priv->my_pid);

            if (controller == NULL) {
                  agp_fe.backend_acquired = FALSE;
                  agp_backend_release(agp_bridge);
                  return -ENOMEM;
            }
            agp_insert_controller(controller);
            agp_controller_make_current(controller);
      }

      set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags);
      set_bit(AGP_FF_IS_VALID, &priv->access_flags);
      return 0;
}

int agpioc_release_wrap(struct agp_file_private *priv)
{
      DBG("");
      agp_controller_release_current(agp_fe.current_controller, priv);
      return 0;
}

int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg)
{
      struct agp_setup mode;

      DBG("");
      if (copy_from_user(&mode, arg, sizeof(struct agp_setup)))
            return -EFAULT;

      agp_enable(agp_bridge, mode.agp_mode);
      return 0;
}

static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
{
      struct agp_region reserve;
      struct agp_client *client;
      struct agp_file_private *client_priv;

      DBG("");
      if (copy_from_user(&reserve, arg, sizeof(struct agp_region)))
            return -EFAULT;

      if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment))
            return -EFAULT;

      client = agp_find_client_by_pid(reserve.pid);

      if (reserve.seg_count == 0) {
            /* remove a client */
            client_priv = agp_find_private(reserve.pid);

            if (client_priv != NULL) {
                  set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
                  set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
            }
            if (client == NULL) {
                  /* client is already removed */
                  return 0;
            }
            return agp_remove_client(reserve.pid);
      } else {
            struct agp_segment *segment;

            if (reserve.seg_count >= 16384)
                  return -EINVAL;

            segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count),
                          GFP_KERNEL);

            if (segment == NULL)
                  return -ENOMEM;

            if (copy_from_user(segment, (void __user *) reserve.seg_list,
                           sizeof(struct agp_segment) * reserve.seg_count)) {
                  kfree(segment);
                  return -EFAULT;
            }
            reserve.seg_list = segment;

            if (client == NULL) {
                  /* Create the client and add the segment */
                  client = agp_create_client(reserve.pid);

                  if (client == NULL) {
                        kfree(segment);
                        return -ENOMEM;
                  }
                  client_priv = agp_find_private(reserve.pid);

                  if (client_priv != NULL) {
                        set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
                        set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
                  }
            }
            return agp_create_segment(client, &reserve);
      }
      /* Will never really happen */
      return -EINVAL;
}

int agpioc_protect_wrap(struct agp_file_private *priv)
{
      DBG("");
      /* This function is not currently implemented */
      return -EINVAL;
}

static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
{
      struct agp_memory *memory;
      struct agp_allocate alloc;

      DBG("");
      if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate)))
            return -EFAULT;

      if (alloc.type >= AGP_USER_TYPES)
            return -EINVAL;

      memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);

      if (memory == NULL)
            return -ENOMEM;

      alloc.key = memory->key;
      alloc.physical = memory->physical;

      if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) {
            agp_free_memory_wrap(memory);
            return -EFAULT;
      }
      return 0;
}

int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg)
{
      struct agp_memory *memory;

      DBG("");
      memory = agp_find_mem_by_key(arg);

      if (memory == NULL)
            return -EINVAL;

      agp_free_memory_wrap(memory);
      return 0;
}

static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
{
      struct agp_bind bind_info;
      struct agp_memory *memory;

      DBG("");
      if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind)))
            return -EFAULT;

      memory = agp_find_mem_by_key(bind_info.key);

      if (memory == NULL)
            return -EINVAL;

      return agp_bind_memory(memory, bind_info.pg_start);
}

static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
{
      struct agp_memory *memory;
      struct agp_unbind unbind;

      DBG("");
      if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind)))
            return -EFAULT;

      memory = agp_find_mem_by_key(unbind.key);

      if (memory == NULL)
            return -EINVAL;

      return agp_unbind_memory(memory);
}

static int agp_ioctl(struct inode *inode, struct file *file,
                 unsigned int cmd, unsigned long arg)
{
      struct agp_file_private *curr_priv = file->private_data;
      int ret_val = -ENOTTY;

      DBG("priv=%p, cmd=%x", curr_priv, cmd);
      mutex_lock(&(agp_fe.agp_mutex));

      if ((agp_fe.current_controller == NULL) &&
          (cmd != AGPIOC_ACQUIRE)) {
            ret_val = -EINVAL;
            goto ioctl_out;
      }
      if ((agp_fe.backend_acquired != TRUE) &&
          (cmd != AGPIOC_ACQUIRE)) {
            ret_val = -EBUSY;
            goto ioctl_out;
      }
      if (cmd != AGPIOC_ACQUIRE) {
            if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
                  ret_val = -EPERM;
                  goto ioctl_out;
            }
            /* Use the original pid of the controller,
             * in case it's threaded */

            if (agp_fe.current_controller->pid != curr_priv->my_pid) {
                  ret_val = -EBUSY;
                  goto ioctl_out;
            }
      }

      switch (cmd) {
      case AGPIOC_INFO:
            ret_val = agpioc_info_wrap(curr_priv, (void __user *) arg);
            break;

      case AGPIOC_ACQUIRE:
            ret_val = agpioc_acquire_wrap(curr_priv);
            break;

      case AGPIOC_RELEASE:
            ret_val = agpioc_release_wrap(curr_priv);
            break;

      case AGPIOC_SETUP:
            ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
            break;

      case AGPIOC_RESERVE:
            ret_val = agpioc_reserve_wrap(curr_priv, (void __user *) arg);
            break;

      case AGPIOC_PROTECT:
            ret_val = agpioc_protect_wrap(curr_priv);
            break;

      case AGPIOC_ALLOCATE:
            ret_val = agpioc_allocate_wrap(curr_priv, (void __user *) arg);
            break;

      case AGPIOC_DEALLOCATE:
            ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
            break;

      case AGPIOC_BIND:
            ret_val = agpioc_bind_wrap(curr_priv, (void __user *) arg);
            break;

      case AGPIOC_UNBIND:
            ret_val = agpioc_unbind_wrap(curr_priv, (void __user *) arg);
            break;
      }

ioctl_out:
      DBG("ioctl returns %d\n", ret_val);
      mutex_unlock(&(agp_fe.agp_mutex));
      return ret_val;
}

static const struct file_operations agp_fops =
{
      .owner            = THIS_MODULE,
      .llseek           = no_llseek,
      .read       = agp_read,
      .write            = agp_write,
      .ioctl            = agp_ioctl,
#ifdef CONFIG_COMPAT
      .compat_ioctl     = compat_agp_ioctl,
#endif
      .mmap       = agp_mmap,
      .open       = agp_open,
      .release    = agp_release,
};

static struct miscdevice agp_miscdev =
{
      .minor      = AGPGART_MINOR,
      .name = "agpgart",
      .fops = &agp_fops
};

int agp_frontend_initialize(void)
{
      memset(&agp_fe, 0, sizeof(struct agp_front_data));
      mutex_init(&(agp_fe.agp_mutex));

      if (misc_register(&agp_miscdev)) {
            printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR);
            return -EIO;
      }
      return 0;
}

void agp_frontend_cleanup(void)
{
      misc_deregister(&agp_miscdev);
}

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