diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/char/agp/frontend.c | 1068 |
1 files changed, 1068 insertions, 0 deletions
diff --git a/drivers/char/agp/frontend.c b/drivers/char/agp/frontend.c new file mode 100644 index 000000000..321118a9c --- /dev/null +++ b/drivers/char/agp/frontend.c @@ -0,0 +1,1068 @@ +/* + * 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/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 <linux/uaccess.h> + +#include "agp.h" +#include "compat_ioctl.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 i; + off_t pg_start; + size_t pg_count; + + pg_start = offset / 4096; + pg_count = size / 4096; + seg = *(client->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, 0) | 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, + pgprot_writecombine(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, + pgprot_writecombine(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; + + if (minor != AGPGART_MINOR) + return -ENXIO; + + mutex_lock(&(agp_fe.agp_mutex)); + + priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL); + if (priv == NULL) { + mutex_unlock(&(agp_fe.agp_mutex)); + return -ENOMEM; + } + + set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags); + priv->my_pid = current->pid; + + if (capable(CAP_SYS_RAWIO)) + /* 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; +} + +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); + + memset(&userinfo, 0, sizeof(userinfo)); + 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 long agp_ioctl(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; + + case AGPIOC_CHIPSET_FLUSH: + 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, + .unlocked_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); +} |