| /* |
| * AGPGART driver frontend |
| * Copyright (C) 2004 Silicon Graphics, Inc. |
| * Copyright (C) 2002-2003 Dave Jones |
| * Copyright (C) 1999 Jeff Hartmann |
| * Copyright (C) 1999 Precision Insight, Inc. |
| * Copyright (C) 1999 Xi Graphics, Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, |
| * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE |
| * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/mman.h> |
| #include <linux/pci.h> |
| #include <linux/init.h> |
| #include <linux/miscdevice.h> |
| #include <linux/agp_backend.h> |
| #include <linux/agpgart.h> |
| #include <linux/slab.h> |
| #include <linux/mm.h> |
| #include <linux/fs.h> |
| #include <linux/sched.h> |
| #include <asm/uaccess.h> |
| #include <asm/pgtable.h> |
| #include "agp.h" |
| |
| struct agp_front_data agp_fe; |
| |
| struct agp_memory *agp_find_mem_by_key(int key) |
| { |
| struct agp_memory *curr; |
| |
| if (agp_fe.current_controller == NULL) |
| return NULL; |
| |
| curr = agp_fe.current_controller->pool; |
| |
| while (curr != NULL) { |
| if (curr->key == key) |
| break; |
| curr = curr->next; |
| } |
| |
| DBG("key=%d -> mem=%p", key, curr); |
| return curr; |
| } |
| |
| static void agp_remove_from_pool(struct agp_memory *temp) |
| { |
| struct agp_memory *prev; |
| struct agp_memory *next; |
| |
| /* Check to see if this is even in the memory pool */ |
| |
| DBG("mem=%p", temp); |
| if (agp_find_mem_by_key(temp->key) != NULL) { |
| next = temp->next; |
| prev = temp->prev; |
| |
| if (prev != NULL) { |
| prev->next = next; |
| if (next != NULL) |
| next->prev = prev; |
| |
| } else { |
| /* This is the first item on the list */ |
| if (next != NULL) |
| next->prev = NULL; |
| |
| agp_fe.current_controller->pool = next; |
| } |
| } |
| } |
| |
| /* |
| * Routines for managing each client's segment list - |
| * These routines handle adding and removing segments |
| * to each auth'ed client. |
| */ |
| |
| static struct |
| agp_segment_priv *agp_find_seg_in_client(const struct agp_client *client, |
| unsigned long offset, |
| int size, pgprot_t page_prot) |
| { |
| struct agp_segment_priv *seg; |
| int num_segments, i; |
| off_t pg_start; |
| size_t pg_count; |
| |
| pg_start = offset / 4096; |
| pg_count = size / 4096; |
| seg = *(client->segments); |
| num_segments = client->num_segments; |
| |
| for (i = 0; i < client->num_segments; i++) { |
| if ((seg[i].pg_start == pg_start) && |
| (seg[i].pg_count == pg_count) && |
| (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) { |
| return seg + i; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static void agp_remove_seg_from_client(struct agp_client *client) |
| { |
| DBG("client=%p", client); |
| |
| if (client->segments != NULL) { |
| if (*(client->segments) != NULL) { |
| DBG("Freeing %p from client %p", *(client->segments), client); |
| kfree(*(client->segments)); |
| } |
| DBG("Freeing %p from client %p", client->segments, client); |
| kfree(client->segments); |
| client->segments = NULL; |
| } |
| } |
| |
| static void agp_add_seg_to_client(struct agp_client *client, |
| struct agp_segment_priv ** seg, int num_segments) |
| { |
| struct agp_segment_priv **prev_seg; |
| |
| prev_seg = client->segments; |
| |
| if (prev_seg != NULL) |
| agp_remove_seg_from_client(client); |
| |
| DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client); |
| client->num_segments = num_segments; |
| client->segments = seg; |
| } |
| |
| static pgprot_t agp_convert_mmap_flags(int prot) |
| { |
| unsigned long prot_bits; |
| |
| prot_bits = calc_vm_prot_bits(prot) | VM_SHARED; |
| return vm_get_page_prot(prot_bits); |
| } |
| |
| int agp_create_segment(struct agp_client *client, struct agp_region *region) |
| { |
| struct agp_segment_priv **ret_seg; |
| struct agp_segment_priv *seg; |
| struct agp_segment *user_seg; |
| size_t i; |
| |
| seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL); |
| if (seg == NULL) { |
| kfree(region->seg_list); |
| region->seg_list = NULL; |
| return -ENOMEM; |
| } |
| user_seg = region->seg_list; |
| |
| for (i = 0; i < region->seg_count; i++) { |
| seg[i].pg_start = user_seg[i].pg_start; |
| seg[i].pg_count = user_seg[i].pg_count; |
| seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot); |
| } |
| kfree(region->seg_list); |
| region->seg_list = NULL; |
| |
| ret_seg = kmalloc(sizeof(void *), GFP_KERNEL); |
| if (ret_seg == NULL) { |
| kfree(seg); |
| return -ENOMEM; |
| } |
| *ret_seg = seg; |
| agp_add_seg_to_client(client, ret_seg, region->seg_count); |
| return 0; |
| } |
| |
| /* End - Routines for managing each client's segment list */ |
| |
| /* This function must only be called when current_controller != NULL */ |
| static void agp_insert_into_pool(struct agp_memory * temp) |
| { |
| struct agp_memory *prev; |
| |
| prev = agp_fe.current_controller->pool; |
| |
| if (prev != NULL) { |
| prev->prev = temp; |
| temp->next = prev; |
| } |
| agp_fe.current_controller->pool = temp; |
| } |
| |
| |
| /* File private list routines */ |
| |
| struct agp_file_private *agp_find_private(pid_t pid) |
| { |
| struct agp_file_private *curr; |
| |
| curr = agp_fe.file_priv_list; |
| |
| while (curr != NULL) { |
| if (curr->my_pid == pid) |
| return curr; |
| curr = curr->next; |
| } |
| |
| return NULL; |
| } |
| |
| static void agp_insert_file_private(struct agp_file_private * priv) |
| { |
| struct agp_file_private *prev; |
| |
| prev = agp_fe.file_priv_list; |
| |
| if (prev != NULL) |
| prev->prev = priv; |
| priv->next = prev; |
| agp_fe.file_priv_list = priv; |
| } |
| |
| static void agp_remove_file_private(struct agp_file_private * priv) |
| { |
| struct agp_file_private *next; |
| struct agp_file_private *prev; |
| |
| next = priv->next; |
| prev = priv->prev; |
| |
| if (prev != NULL) { |
| prev->next = next; |
| |
| if (next != NULL) |
| next->prev = prev; |
| |
| } else { |
| if (next != NULL) |
| next->prev = NULL; |
| |
| agp_fe.file_priv_list = next; |
| } |
| } |
| |
| /* End - File flag list routines */ |
| |
| /* |
| * Wrappers for agp_free_memory & agp_allocate_memory |
| * These make sure that internal lists are kept updated. |
| */ |
| void agp_free_memory_wrap(struct agp_memory *memory) |
| { |
| agp_remove_from_pool(memory); |
| agp_free_memory(memory); |
| } |
| |
| struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type) |
| { |
| struct agp_memory *memory; |
| |
| memory = agp_allocate_memory(agp_bridge, pg_count, type); |
| if (memory == NULL) |
| return NULL; |
| |
| agp_insert_into_pool(memory); |
| return memory; |
| } |
| |
| /* Routines for managing the list of controllers - |
| * These routines manage the current controller, and the list of |
| * controllers |
| */ |
| |
| static struct agp_controller *agp_find_controller_by_pid(pid_t id) |
| { |
| struct agp_controller *controller; |
| |
| controller = agp_fe.controllers; |
| |
| while (controller != NULL) { |
| if (controller->pid == id) |
| return controller; |
| controller = controller->next; |
| } |
| |
| return NULL; |
| } |
| |
| static struct agp_controller *agp_create_controller(pid_t id) |
| { |
| struct agp_controller *controller; |
| |
| controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL); |
| if (controller == NULL) |
| return NULL; |
| |
| controller->pid = id; |
| return controller; |
| } |
| |
| static int agp_insert_controller(struct agp_controller *controller) |
| { |
| struct agp_controller *prev_controller; |
| |
| prev_controller = agp_fe.controllers; |
| controller->next = prev_controller; |
| |
| if (prev_controller != NULL) |
| prev_controller->prev = controller; |
| |
| agp_fe.controllers = controller; |
| |
| return 0; |
| } |
| |
| static void agp_remove_all_clients(struct agp_controller *controller) |
| { |
| struct agp_client *client; |
| struct agp_client *temp; |
| |
| client = controller->clients; |
| |
| while (client) { |
| struct agp_file_private *priv; |
| |
| temp = client; |
| agp_remove_seg_from_client(temp); |
| priv = agp_find_private(temp->pid); |
| |
| if (priv != NULL) { |
| clear_bit(AGP_FF_IS_VALID, &priv->access_flags); |
| clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags); |
| } |
| client = client->next; |
| kfree(temp); |
| } |
| } |
| |
| static void agp_remove_all_memory(struct agp_controller *controller) |
| { |
| struct agp_memory *memory; |
| struct agp_memory *temp; |
| |
| memory = controller->pool; |
| |
| while (memory) { |
| temp = memory; |
| memory = memory->next; |
| agp_free_memory_wrap(temp); |
| } |
| } |
| |
| static int agp_remove_controller(struct agp_controller *controller) |
| { |
| struct agp_controller *prev_controller; |
| struct agp_controller *next_controller; |
| |
| prev_controller = controller->prev; |
| next_controller = controller->next; |
| |
| if (prev_controller != NULL) { |
| prev_controller->next = next_controller; |
| if (next_controller != NULL) |
| next_controller->prev = prev_controller; |
| |
| } else { |
| if (next_controller != NULL) |
| next_controller->prev = NULL; |
| |
| agp_fe.controllers = next_controller; |
| } |
| |
| agp_remove_all_memory(controller); |
| agp_remove_all_clients(controller); |
| |
| if (agp_fe.current_controller == controller) { |
| agp_fe.current_controller = NULL; |
| agp_fe.backend_acquired = FALSE; |
| agp_backend_release(agp_bridge); |
| } |
| kfree(controller); |
| return 0; |
| } |
| |
| static void agp_controller_make_current(struct agp_controller *controller) |
| { |
| struct agp_client *clients; |
| |
| clients = controller->clients; |
| |
| while (clients != NULL) { |
| struct agp_file_private *priv; |
| |
| priv = agp_find_private(clients->pid); |
| |
| if (priv != NULL) { |
| set_bit(AGP_FF_IS_VALID, &priv->access_flags); |
| set_bit(AGP_FF_IS_CLIENT, &priv->access_flags); |
| } |
| clients = clients->next; |
| } |
| |
| agp_fe.current_controller = controller; |
| } |
| |
| static void agp_controller_release_current(struct agp_controller *controller, |
| struct agp_file_private *controller_priv) |
| { |
| struct agp_client *clients; |
| |
| clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags); |
| clients = controller->clients; |
| |
| while (clients != NULL) { |
| struct agp_file_private *priv; |
| |
| priv = agp_find_private(clients->pid); |
| |
| if (priv != NULL) |
| clear_bit(AGP_FF_IS_VALID, &priv->access_flags); |
| |
| clients = clients->next; |
| } |
| |
| agp_fe.current_controller = NULL; |
| agp_fe.used_by_controller = FALSE; |
| agp_backend_release(agp_bridge); |
| } |
| |
| /* |
| * Routines for managing client lists - |
| * These routines are for managing the list of auth'ed clients. |
| */ |
| |
| static struct agp_client |
| *agp_find_client_in_controller(struct agp_controller *controller, pid_t id) |
| { |
| struct agp_client *client; |
| |
| if (controller == NULL) |
| return NULL; |
| |
| client = controller->clients; |
| |
| while (client != NULL) { |
| if (client->pid == id) |
| return client; |
| client = client->next; |
| } |
| |
| return NULL; |
| } |
| |
| static struct agp_controller *agp_find_controller_for_client(pid_t id) |
| { |
| struct agp_controller *controller; |
| |
| controller = agp_fe.controllers; |
| |
| while (controller != NULL) { |
| if ((agp_find_client_in_controller(controller, id)) != NULL) |
| return controller; |
| controller = controller->next; |
| } |
| |
| return NULL; |
| } |
| |
| struct agp_client *agp_find_client_by_pid(pid_t id) |
| { |
| struct agp_client *temp; |
| |
| if (agp_fe.current_controller == NULL) |
| return NULL; |
| |
| temp = agp_find_client_in_controller(agp_fe.current_controller, id); |
| return temp; |
| } |
| |
| static void agp_insert_client(struct agp_client *client) |
| { |
| struct agp_client *prev_client; |
| |
| prev_client = agp_fe.current_controller->clients; |
| client->next = prev_client; |
| |
| if (prev_client != NULL) |
| prev_client->prev = client; |
| |
| agp_fe.current_controller->clients = client; |
| agp_fe.current_controller->num_clients++; |
| } |
| |
| struct agp_client *agp_create_client(pid_t id) |
| { |
| struct agp_client *new_client; |
| |
| new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL); |
| if (new_client == NULL) |
| return NULL; |
| |
| new_client->pid = id; |
| agp_insert_client(new_client); |
| return new_client; |
| } |
| |
| int agp_remove_client(pid_t id) |
| { |
| struct agp_client *client; |
| struct agp_client *prev_client; |
| struct agp_client *next_client; |
| struct agp_controller *controller; |
| |
| controller = agp_find_controller_for_client(id); |
| if (controller == NULL) |
| return -EINVAL; |
| |
| client = agp_find_client_in_controller(controller, id); |
| if (client == NULL) |
| return -EINVAL; |
| |
| prev_client = client->prev; |
| next_client = client->next; |
| |
| if (prev_client != NULL) { |
| prev_client->next = next_client; |
| if (next_client != NULL) |
| next_client->prev = prev_client; |
| |
| } else { |
| if (next_client != NULL) |
| next_client->prev = NULL; |
| controller->clients = next_client; |
| } |
| |
| controller->num_clients--; |
| agp_remove_seg_from_client(client); |
| kfree(client); |
| return 0; |
| } |
| |
| /* End - Routines for managing client lists */ |
| |
| /* File Operations */ |
| |
| static int agp_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| unsigned int size, current_size; |
| unsigned long offset; |
| struct agp_client *client; |
| struct agp_file_private *priv = file->private_data; |
| struct agp_kern_info kerninfo; |
| |
| mutex_lock(&(agp_fe.agp_mutex)); |
| |
| if (agp_fe.backend_acquired != TRUE) |
| goto out_eperm; |
| |
| if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags))) |
| goto out_eperm; |
| |
| agp_copy_info(agp_bridge, &kerninfo); |
| size = vma->vm_end - vma->vm_start; |
| current_size = kerninfo.aper_size; |
| current_size = current_size * 0x100000; |
| offset = vma->vm_pgoff << PAGE_SHIFT; |
| DBG("%lx:%lx", offset, offset+size); |
| |
| if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) { |
| if ((size + offset) > current_size) |
| goto out_inval; |
| |
| client = agp_find_client_by_pid(current->pid); |
| |
| if (client == NULL) |
| goto out_eperm; |
| |
| if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot)) |
| goto out_inval; |
| |
| DBG("client vm_ops=%p", kerninfo.vm_ops); |
| if (kerninfo.vm_ops) { |
| vma->vm_ops = kerninfo.vm_ops; |
| } else if (io_remap_pfn_range(vma, vma->vm_start, |
| (kerninfo.aper_base + offset) >> PAGE_SHIFT, |
| size, vma->vm_page_prot)) { |
| goto out_again; |
| } |
| mutex_unlock(&(agp_fe.agp_mutex)); |
| return 0; |
| } |
| |
| if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) { |
| if (size != current_size) |
| goto out_inval; |
| |
| DBG("controller vm_ops=%p", kerninfo.vm_ops); |
| if (kerninfo.vm_ops) { |
| vma->vm_ops = kerninfo.vm_ops; |
| } else if (io_remap_pfn_range(vma, vma->vm_start, |
| kerninfo.aper_base >> PAGE_SHIFT, |
| size, vma->vm_page_prot)) { |
| goto out_again; |
| } |
| mutex_unlock(&(agp_fe.agp_mutex)); |
| return 0; |
| } |
| |
| out_eperm: |
| mutex_unlock(&(agp_fe.agp_mutex)); |
| return -EPERM; |
| |
| out_inval: |
| mutex_unlock(&(agp_fe.agp_mutex)); |
| return -EINVAL; |
| |
| out_again: |
| mutex_unlock(&(agp_fe.agp_mutex)); |
| return -EAGAIN; |
| } |
| |
| static int agp_release(struct inode *inode, struct file *file) |
| { |
| struct agp_file_private *priv = file->private_data; |
| |
| mutex_lock(&(agp_fe.agp_mutex)); |
| |
| DBG("priv=%p", priv); |
| |
| if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) { |
| struct agp_controller *controller; |
| |
| controller = agp_find_controller_by_pid(priv->my_pid); |
| |
| if (controller != NULL) { |
| if (controller == agp_fe.current_controller) |
| agp_controller_release_current(controller, priv); |
| agp_remove_controller(controller); |
| controller = NULL; |
| } |
| } |
| |
| if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) |
| agp_remove_client(priv->my_pid); |
| |
| agp_remove_file_private(priv); |
| kfree(priv); |
| file->private_data = NULL; |
| mutex_unlock(&(agp_fe.agp_mutex)); |
| return 0; |
| } |
| |
| static int agp_open(struct inode *inode, struct file *file) |
| { |
| int minor = iminor(inode); |
| struct agp_file_private *priv; |
| struct agp_client *client; |
| int rc = -ENXIO; |
| |
| mutex_lock(&(agp_fe.agp_mutex)); |
| |
| if (minor != AGPGART_MINOR) |
| goto err_out; |
| |
| priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL); |
| if (priv == NULL) |
| goto err_out_nomem; |
| |
| set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags); |
| priv->my_pid = current->pid; |
| |
| if (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; |
| |
| err_out_nomem: |
| rc = -ENOMEM; |
| err_out: |
| mutex_unlock(&(agp_fe.agp_mutex)); |
| return rc; |
| } |
| |
| |
| static ssize_t agp_read(struct file *file, char __user *buf, |
| size_t count, loff_t * ppos) |
| { |
| return -EINVAL; |
| } |
| |
| static ssize_t agp_write(struct file *file, const char __user *buf, |
| size_t count, loff_t * ppos) |
| { |
| return -EINVAL; |
| } |
| |
| static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg) |
| { |
| struct agp_info userinfo; |
| struct agp_kern_info kerninfo; |
| |
| agp_copy_info(agp_bridge, &kerninfo); |
| |
| userinfo.version.major = kerninfo.version.major; |
| userinfo.version.minor = kerninfo.version.minor; |
| userinfo.bridge_id = kerninfo.device->vendor | |
| (kerninfo.device->device << 16); |
| userinfo.agp_mode = kerninfo.mode; |
| userinfo.aper_base = kerninfo.aper_base; |
| userinfo.aper_size = kerninfo.aper_size; |
| userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory; |
| userinfo.pg_used = kerninfo.current_memory; |
| |
| if (copy_to_user(arg, &userinfo, sizeof(struct agp_info))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| int agpioc_acquire_wrap(struct agp_file_private *priv) |
| { |
| struct agp_controller *controller; |
| |
| DBG(""); |
| |
| if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags))) |
| return -EPERM; |
| |
| if (agp_fe.current_controller != NULL) |
| return -EBUSY; |
| |
| if (!agp_bridge) |
| return -ENODEV; |
| |
| if (atomic_read(&agp_bridge->agp_in_use)) |
| return -EBUSY; |
| |
| atomic_inc(&agp_bridge->agp_in_use); |
| |
| agp_fe.backend_acquired = TRUE; |
| |
| controller = agp_find_controller_by_pid(priv->my_pid); |
| |
| if (controller != NULL) { |
| agp_controller_make_current(controller); |
| } else { |
| controller = agp_create_controller(priv->my_pid); |
| |
| if (controller == NULL) { |
| agp_fe.backend_acquired = FALSE; |
| agp_backend_release(agp_bridge); |
| return -ENOMEM; |
| } |
| agp_insert_controller(controller); |
| agp_controller_make_current(controller); |
| } |
| |
| set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags); |
| set_bit(AGP_FF_IS_VALID, &priv->access_flags); |
| return 0; |
| } |
| |
| int agpioc_release_wrap(struct agp_file_private *priv) |
| { |
| DBG(""); |
| agp_controller_release_current(agp_fe.current_controller, priv); |
| return 0; |
| } |
| |
| int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg) |
| { |
| struct agp_setup mode; |
| |
| DBG(""); |
| if (copy_from_user(&mode, arg, sizeof(struct agp_setup))) |
| return -EFAULT; |
| |
| agp_enable(agp_bridge, mode.agp_mode); |
| return 0; |
| } |
| |
| static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg) |
| { |
| struct agp_region reserve; |
| struct agp_client *client; |
| struct agp_file_private *client_priv; |
| |
| DBG(""); |
| if (copy_from_user(&reserve, arg, sizeof(struct agp_region))) |
| return -EFAULT; |
| |
| if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment)) |
| return -EFAULT; |
| |
| client = agp_find_client_by_pid(reserve.pid); |
| |
| if (reserve.seg_count == 0) { |
| /* remove a client */ |
| client_priv = agp_find_private(reserve.pid); |
| |
| if (client_priv != NULL) { |
| set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags); |
| set_bit(AGP_FF_IS_VALID, &client_priv->access_flags); |
| } |
| if (client == NULL) { |
| /* client is already removed */ |
| return 0; |
| } |
| return agp_remove_client(reserve.pid); |
| } else { |
| struct agp_segment *segment; |
| |
| if (reserve.seg_count >= 16384) |
| return -EINVAL; |
| |
| segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count), |
| GFP_KERNEL); |
| |
| if (segment == NULL) |
| return -ENOMEM; |
| |
| if (copy_from_user(segment, (void __user *) reserve.seg_list, |
| sizeof(struct agp_segment) * reserve.seg_count)) { |
| kfree(segment); |
| return -EFAULT; |
| } |
| reserve.seg_list = segment; |
| |
| if (client == NULL) { |
| /* Create the client and add the segment */ |
| client = agp_create_client(reserve.pid); |
| |
| if (client == NULL) { |
| kfree(segment); |
| return -ENOMEM; |
| } |
| client_priv = agp_find_private(reserve.pid); |
| |
| if (client_priv != NULL) { |
| set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags); |
| set_bit(AGP_FF_IS_VALID, &client_priv->access_flags); |
| } |
| } |
| return agp_create_segment(client, &reserve); |
| } |
| /* Will never really happen */ |
| return -EINVAL; |
| } |
| |
| int agpioc_protect_wrap(struct agp_file_private *priv) |
| { |
| DBG(""); |
| /* This function is not currently implemented */ |
| return -EINVAL; |
| } |
| |
| static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg) |
| { |
| struct agp_memory *memory; |
| struct agp_allocate alloc; |
| |
| DBG(""); |
| if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate))) |
| return -EFAULT; |
| |
| if (alloc.type >= AGP_USER_TYPES) |
| return -EINVAL; |
| |
| memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type); |
| |
| if (memory == NULL) |
| return -ENOMEM; |
| |
| alloc.key = memory->key; |
| alloc.physical = memory->physical; |
| |
| if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) { |
| agp_free_memory_wrap(memory); |
| return -EFAULT; |
| } |
| return 0; |
| } |
| |
| int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg) |
| { |
| struct agp_memory *memory; |
| |
| DBG(""); |
| memory = agp_find_mem_by_key(arg); |
| |
| if (memory == NULL) |
| return -EINVAL; |
| |
| agp_free_memory_wrap(memory); |
| return 0; |
| } |
| |
| static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg) |
| { |
| struct agp_bind bind_info; |
| struct agp_memory *memory; |
| |
| DBG(""); |
| if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind))) |
| return -EFAULT; |
| |
| memory = agp_find_mem_by_key(bind_info.key); |
| |
| if (memory == NULL) |
| return -EINVAL; |
| |
| return agp_bind_memory(memory, bind_info.pg_start); |
| } |
| |
| static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg) |
| { |
| struct agp_memory *memory; |
| struct agp_unbind unbind; |
| |
| DBG(""); |
| if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind))) |
| return -EFAULT; |
| |
| memory = agp_find_mem_by_key(unbind.key); |
| |
| if (memory == NULL) |
| return -EINVAL; |
| |
| return agp_unbind_memory(memory); |
| } |
| |
| int agpioc_chipset_flush_wrap(struct agp_file_private *priv) |
| { |
| DBG(""); |
| agp_flush_chipset(agp_bridge); |
| return 0; |
| } |
| |
| 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; |
| |
| case AGPIOC_CHIPSET_FLUSH: |
| ret_val = agpioc_chipset_flush_wrap(curr_priv); |
| break; |
| } |
| |
| ioctl_out: |
| DBG("ioctl returns %d\n", ret_val); |
| mutex_unlock(&(agp_fe.agp_mutex)); |
| return ret_val; |
| } |
| |
| static const struct file_operations agp_fops = |
| { |
| .owner = THIS_MODULE, |
| .llseek = no_llseek, |
| .read = agp_read, |
| .write = agp_write, |
| .ioctl = agp_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = compat_agp_ioctl, |
| #endif |
| .mmap = agp_mmap, |
| .open = agp_open, |
| .release = agp_release, |
| }; |
| |
| static struct miscdevice agp_miscdev = |
| { |
| .minor = AGPGART_MINOR, |
| .name = "agpgart", |
| .fops = &agp_fops |
| }; |
| |
| int agp_frontend_initialize(void) |
| { |
| memset(&agp_fe, 0, sizeof(struct agp_front_data)); |
| mutex_init(&(agp_fe.agp_mutex)); |
| |
| if (misc_register(&agp_miscdev)) { |
| printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| void agp_frontend_cleanup(void) |
| { |
| misc_deregister(&agp_miscdev); |
| } |