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/*
* Adapted from drivers/staging/android/uapi/ion.h
*
* 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.
*
*/
#ifndef _UAPI_LINUX_ION_NEW_H
#define _UAPI_LINUX_ION_NEW_H
#include <linux/ioctl.h>
#include <linux/types.h>
#define ION_NUM_HEAP_IDS (sizeof(unsigned int) * 8)
/**
* DOC: Ion Userspace API
*
* create a client by opening /dev/ion
* most operations handled via following ioctls
*
*/
/**
* struct ion_new_allocation_data - metadata passed from userspace for allocations
* @len: size of the allocation
* @heap_id_mask: mask of heap ids to allocate from
* @flags: flags passed to heap
* @handle: pointer that will be populated with a cookie to use to
* refer to this allocation
*
* Provided by userspace as an argument to the ioctl - added _new to denote
* this belongs to the new ION interface.
*/
struct ion_new_allocation_data {
__u64 len;
__u32 heap_id_mask;
__u32 flags;
__u32 fd;
__u32 unused;
};
#define MAX_HEAP_NAME 32
/**
* struct ion_heap_data - data about a heap
* @name - first 32 characters of the heap name
* @type - heap type
* @heap_id - heap id for the heap
*/
struct ion_heap_data {
char name[MAX_HEAP_NAME];
__u32 type;
__u32 heap_id;
__u32 reserved0;
__u32 reserved1;
__u32 reserved2;
};
/**
* struct ion_heap_query - collection of data about all heaps
* @cnt - total number of heaps to be copied
* @heaps - buffer to copy heap data
*/
struct ion_heap_query {
__u32 cnt; /* Total number of heaps to be copied */
__u32 reserved0; /* align to 64bits */
__u64 heaps; /* buffer to be populated */
__u32 reserved1;
__u32 reserved2;
};
#define ION_IOC_MAGIC 'I'
/**
* DOC: ION_IOC_NEW_ALLOC - allocate memory
*
* Takes an ion_allocation_data struct and returns it with the handle field
* populated with the opaque handle for the allocation.
* TODO: This IOCTL will clash by design; however, only one of
* ION_IOC_ALLOC or ION_IOC_NEW_ALLOC paths will be exercised,
* so this should not conflict.
*/
#define ION_IOC_NEW_ALLOC _IOWR(ION_IOC_MAGIC, 0, struct ion_new_allocation_data)
/**
* DOC: ION_IOC_FREE - free memory
*
* Takes an ion_handle_data struct and frees the handle.
*
* #define ION_IOC_FREE _IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data)
* This will come from the older kernels, so don't redefine here
*/
/**
* DOC: ION_IOC_SHARE - creates a file descriptor to use to share an allocation
*
* Takes an ion_fd_data struct with the handle field populated with a valid
* opaque handle. Returns the struct with the fd field set to a file
* descriptor open in the current address space. This file descriptor
* can then be passed to another process. The corresponding opaque handle can
* be retrieved via ION_IOC_IMPORT.
*
* #define ION_IOC_SHARE _IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data)
* This will come from the older kernels, so don't redefine here
*/
/**
* DOC: ION_IOC_HEAP_QUERY - information about available heaps
*
* Takes an ion_heap_query structure and populates information about
* available Ion heaps.
*/
#define ION_IOC_HEAP_QUERY _IOWR(ION_IOC_MAGIC, 8, struct ion_heap_query)
#endif /* _UAPI_LINUX_ION_NEW_H */
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