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/*
*
* Copyright (C) 2011 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/kernel.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include "ion.h"
#include "ion_priv.h"
#include "compat_ion.h"
union ion_ioctl_arg {
struct ion_fd_data fd;
struct ion_allocation_data allocation;
struct ion_handle_data handle;
struct ion_custom_data custom;
struct ion_heap_query query;
};
static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg)
{
int ret = 0;
switch (cmd) {
case ION_IOC_HEAP_QUERY:
ret = arg->query.reserved0 != 0;
ret |= arg->query.reserved1 != 0;
ret |= arg->query.reserved2 != 0;
break;
default:
break;
}
return ret ? -EINVAL : 0;
}
/* fix up the cases where the ioctl direction bits are incorrect */
static unsigned int ion_ioctl_dir(unsigned int cmd)
{
switch (cmd) {
case ION_IOC_SYNC:
case ION_IOC_FREE:
case ION_IOC_CUSTOM:
return _IOC_WRITE;
default:
return _IOC_DIR(cmd);
}
}
long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct ion_client *client = filp->private_data;
struct ion_device *dev = client->dev;
struct ion_handle *cleanup_handle = NULL;
int ret = 0;
unsigned int dir;
union ion_ioctl_arg data;
dir = ion_ioctl_dir(cmd);
if (_IOC_SIZE(cmd) > sizeof(data))
return -EINVAL;
/*
* The copy_from_user is unconditional here for both read and write
* to do the validate. If there is no write for the ioctl, the
* buffer is cleared
*/
if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
return -EFAULT;
ret = validate_ioctl_arg(cmd, &data);
if (WARN_ON_ONCE(ret))
return ret;
if (!(dir & _IOC_WRITE))
memset(&data, 0, sizeof(data));
switch (cmd) {
case ION_IOC_ALLOC:
{
struct ion_handle *handle;
handle = ion_alloc(client, data.allocation.len,
data.allocation.align,
data.allocation.heap_id_mask,
data.allocation.flags);
if (IS_ERR(handle))
return PTR_ERR(handle);
data.allocation.handle = handle->id;
cleanup_handle = handle;
break;
}
case ION_IOC_FREE:
{
struct ion_handle *handle;
mutex_lock(&client->lock);
handle = ion_handle_get_by_id_nolock(client,
data.handle.handle);
if (IS_ERR(handle)) {
mutex_unlock(&client->lock);
return PTR_ERR(handle);
}
ion_free_nolock(client, handle);
ion_handle_put_nolock(handle);
mutex_unlock(&client->lock);
break;
}
case ION_IOC_SHARE:
case ION_IOC_MAP:
{
struct ion_handle *handle;
handle = ion_handle_get_by_id(client, data.handle.handle);
if (IS_ERR(handle))
return PTR_ERR(handle);
data.fd.fd = ion_share_dma_buf_fd(client, handle);
ion_handle_put(handle);
if (data.fd.fd < 0)
ret = data.fd.fd;
break;
}
case ION_IOC_IMPORT:
{
struct ion_handle *handle;
handle = ion_import_dma_buf_fd(client, data.fd.fd);
if (IS_ERR(handle))
ret = PTR_ERR(handle);
else
data.handle.handle = handle->id;
break;
}
case ION_IOC_SYNC:
{
ret = ion_sync_for_device(client, data.fd.fd);
break;
}
case ION_IOC_CUSTOM:
{
if (!dev->custom_ioctl)
return -ENOTTY;
ret = dev->custom_ioctl(client, data.custom.cmd,
data.custom.arg);
break;
}
case ION_IOC_HEAP_QUERY:
ret = ion_query_heaps(client, &data.query);
break;
default:
return -ENOTTY;
}
if (dir & _IOC_READ) {
if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
if (cleanup_handle)
ion_free(client, cleanup_handle);
return -EFAULT;
}
}
return ret;
}
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