/**
* Initialize the AGP resources.
*
* \return pointer to a drm_agp_head structure.
*
*/
drm_agp_head_t *drm_agp_init(drm_device_t *dev)
{
drm_agp_head_t *head = NULL;
if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
return NULL;
memset((void *)head, 0, sizeof(*head));
head->bridge = agp_find_bridge(dev->pdev);
if (!head->bridge) {
if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
return NULL;
}
agp_copy_info(head->bridge, &head->agp_info);
agp_backend_release(head->bridge);
} else {
agp_copy_info(head->bridge, &head->agp_info);
}
if (head->agp_info.chipset == NOT_SUPPORTED) {
drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
return NULL;
}
head->memory = NULL;
head->cant_use_aperture = head->agp_info.cant_use_aperture;
head->page_mask = head->agp_info.page_mask;
return head;
}
static int compat_agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
{
struct agp_info32 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 = (compat_long_t)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(userinfo)))
return -EFAULT;
return 0;
}
static int agpioc_info_wrap(agp_file_private * priv, unsigned long arg)
{
agp_info userinfo;
agp_kern_info kerninfo;
agp_copy_info(&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((void *) arg, &userinfo, sizeof(agp_info))) {
return -EFAULT;
}
return 0;
}
static int agp_mmap(struct file *file, struct vm_area_struct *vma)
{
unsigned int size, current_size;
unsigned long offset;
struct agp_client *client;
struct agp_file_private *priv = file->private_data;
struct agp_kern_info kerninfo;
down(&(agp_fe.agp_mutex));
if (agp_fe.backend_acquired != TRUE)
goto out_eperm;
if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags)))
goto out_eperm;
agp_copy_info(&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 (remap_page_range(vma, vma->vm_start,
(kerninfo.aper_base + offset),
size, vma->vm_page_prot)) {
goto out_again;
}
up(&(agp_fe.agp_mutex));
return 0;
}
if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
if (size != current_size)
goto out_inval;
DBG("controller vm_ops=%p", kerninfo.vm_ops);
if (kerninfo.vm_ops) {
vma->vm_ops = kerninfo.vm_ops;
} else if (remap_page_range(vma, vma->vm_start,
kerninfo.aper_base,
size, vma->vm_page_prot)) {
goto out_again;
}
up(&(agp_fe.agp_mutex));
return 0;
}
out_eperm:
up(&(agp_fe.agp_mutex));
return -EPERM;
out_inval:
up(&(agp_fe.agp_mutex));
return -EINVAL;
out_again:
up(&(agp_fe.agp_mutex));
return -EAGAIN;
}
static int agp_mmap(struct file *file, struct vm_area_struct *vma)
{
int size;
int current_size;
unsigned long offset;
agp_client *client;
agp_file_private *priv = (agp_file_private *) file->private_data;
agp_kern_info kerninfo;
lock_kernel();
AGP_LOCK();
if (agp_fe.backend_acquired != TRUE) {
AGP_UNLOCK();
unlock_kernel();
return -EPERM;
}
if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags))) {
AGP_UNLOCK();
unlock_kernel();
return -EPERM;
}
agp_copy_info(&kerninfo);
size = vma->vm_end - vma->vm_start;
current_size = kerninfo.aper_size;
current_size = current_size * 0x100000;
offset = vma->vm_pgoff << PAGE_SHIFT;
if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) {
if ((size + offset) > current_size) {
AGP_UNLOCK();
unlock_kernel();
return -EINVAL;
}
client = agp_find_client_by_pid(current->pid);
if (client == NULL) {
AGP_UNLOCK();
unlock_kernel();
return -EPERM;
}
if (!agp_find_seg_in_client(client, offset,
size, vma->vm_page_prot)) {
AGP_UNLOCK();
unlock_kernel();
return -EINVAL;
}
if (remap_page_range(vma->vm_start,
(kerninfo.aper_base + offset),
size, vma->vm_page_prot)) {
AGP_UNLOCK();
unlock_kernel();
return -EAGAIN;
}
AGP_UNLOCK();
unlock_kernel();
return 0;
}
if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
if (size != current_size) {
AGP_UNLOCK();
unlock_kernel();
return -EINVAL;
}
if (remap_page_range(vma->vm_start, kerninfo.aper_base,
size, vma->vm_page_prot)) {
AGP_UNLOCK();
unlock_kernel();
return -EAGAIN;
}
AGP_UNLOCK();
unlock_kernel();
return 0;
}
AGP_UNLOCK();
unlock_kernel();
return -EPERM;
}
