/* * 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 = 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 */ static 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. */ 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 = 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; } 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 = 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; } 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; 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; } 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); 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, .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); }