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linux/drivers/char/agp/frontend.c

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/*
* 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 <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, 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);
}
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