Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1103 insertions, 0 deletions

diff --git a/drivers/char/agp/frontend.c b/drivers/char/agp/frontend.c
new file mode 100644
index 000000000000..f633623ac802
--- /dev/null
+++ b/drivers/char/agp/frontend.c
@@ -0,0 +1,1103 @@
+/*
+ * 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 <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include "agp.h"
+
+static struct agp_front_data agp_fe;
+
+static 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;
+}
+
+/* Originally taken from linux/mm/mmap.c from the array
+ * protection_map.
+ * The original really should be exported to modules, or
+ * some routine which does the conversion for you
+ */
+
+static const pgprot_t my_protect_map[16] =
+{
+        __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
+        __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
+};
+
+static pgprot_t agp_convert_mmap_flags(int prot)
+{
+#define _trans(x,bit1,bit2) \
+((bit1==bit2)?(x&bit1):(x&bit1)?bit2:0)
+
+        unsigned long prot_bits;
+        pgprot_t temp;
+
+        prot_bits = _trans(prot, PROT_READ, VM_READ) |
+            _trans(prot, PROT_WRITE, VM_WRITE) |
+            _trans(prot, PROT_EXEC, VM_EXEC);
+
+        prot_bits |= VM_SHARED;
+
+        temp = my_protect_map[prot_bits & 0x0000000f];
+
+        return temp;
+}
+
+static 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 = kmalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL);
+        if (seg == NULL) {
+                kfree(region->seg_list);
+                region->seg_list = NULL;
+                return -ENOMEM;
+        }
+        memset(seg, 0, (sizeof(struct agp_segment_priv) * region->seg_count));
+        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;
+}
+
+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;
+}
+
+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.
+ */
+static void agp_free_memory_wrap(struct agp_memory *memory)
+{
+        agp_remove_from_pool(memory);
+        agp_free_memory(memory);
+}
+
+static 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 = kmalloc(sizeof(struct agp_controller), GFP_KERNEL);
+
+        if (controller == NULL)
+                return NULL;
+
+        memset(controller, 0, sizeof(struct agp_controller));
+        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;
+}
+
+static 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++;
+}
+
+static struct agp_client *agp_create_client(pid_t id)
+{
+        struct agp_client *new_client;
+
+        new_client = kmalloc(sizeof(struct agp_client), GFP_KERNEL);
+
+        if (new_client == NULL)
+                return NULL;
+
+        memset(new_client, 0, sizeof(struct agp_client));
+        new_client->pid = id;
+        agp_insert_client(new_client);
+        return new_client;
+}
+
+static 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;
+
+        down(&(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;
+                }
+                up(&(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;
+                }
+                up(&(agp_fe.agp_mutex));
+                return 0;
+        }
+
+out_eperm:
+        up(&(agp_fe.agp_mutex));
+        return -EPERM;
+
+out_inval:
+        up(&(agp_fe.agp_mutex));
+        return -EINVAL;
+
+out_again:
+        up(&(agp_fe.agp_mutex));
+        return -EAGAIN;
+}
+
+static int agp_release(struct inode *inode, struct file *file)
+{
+        struct agp_file_private *priv = file->private_data;
+
+        down(&(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;
+        up(&(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;
+
+        down(&(agp_fe.agp_mutex));
+
+        if (minor != AGPGART_MINOR)
+                goto err_out;
+
+        priv = kmalloc(sizeof(struct agp_file_private), GFP_KERNEL);
+        if (priv == NULL)
+                goto err_out_nomem;
+
+        memset(priv, 0, sizeof(struct agp_file_private));
+        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);
+        up(&(agp_fe.agp_mutex));
+        return 0;
+
+err_out_nomem:
+        rc = -ENOMEM;
+err_out:
+        up(&(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;
+}
+
+static 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;
+}
+
+static int agpioc_release_wrap(struct agp_file_private *priv)
+{
+        DBG("");
+        agp_controller_release_current(agp_fe.current_controller, priv);
+        return 0;
+}
+
+static 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;
+}
+
+static 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;
+
+        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;
+}
+
+static 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);
+        down(&(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);
+        up(&(agp_fe.agp_mutex));
+        return ret_val;
+}
+
+static struct file_operations agp_fops =
+{
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .read           = agp_read,
+        .write          = agp_write,
+        .ioctl          = agp_ioctl,
+        .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));
+        sema_init(&(agp_fe.agp_mutex), 1);
+
+        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);
+}