161 lines
4.6 KiB
C
161 lines
4.6 KiB
C
/*
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* Adapted from drivers/staging/android/uapi/ion.h
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*
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* Copyright (C) 2019 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _UAPI_LINUX_ION_NEW_H
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#define _UAPI_LINUX_ION_NEW_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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#define ION_NUM_HEAP_IDS (sizeof(unsigned int) * 8)
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enum ion_heap_type_ext {
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ION_HEAP_TYPE_CUSTOM_EXT = 16,
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ION_HEAP_TYPE_MAX = 31,
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};
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/**
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* ion_heap_id - list of standard heap ids that Android can use
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*
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* @ION_HEAP_SYSTEM Id for the ION_HEAP_TYPE_SYSTEM
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* @ION_HEAP_DMA_START Start of reserved id range for heaps of type
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* ION_HEAP_TYPE_DMA
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* @ION_HEAP_DMA_END End of reserved id range for heaps of type
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* ION_HEAP_TYPE_DMA
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* @ION_HEAP_CUSTOM_START Start of reserved id range for heaps of custom
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* type
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* @ION_HEAP_CUSTOM_END End of reserved id range for heaps of custom
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* type
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*/
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enum ion_heap_id {
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ION_HEAP_SYSTEM = (1 << ION_HEAP_TYPE_SYSTEM),
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ION_HEAP_DMA_START = (ION_HEAP_SYSTEM << 1),
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ION_HEAP_DMA_END = (ION_HEAP_DMA_START << 7),
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ION_HEAP_CUSTOM_START = (ION_HEAP_DMA_END << 1),
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ION_HEAP_CUSTOM_END = (ION_HEAP_CUSTOM_START << 22),
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};
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#define ION_NUM_MAX_HEAPS (32)
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/**
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* DOC: Ion Userspace API
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*
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* create a client by opening /dev/ion
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* most operations handled via following ioctls
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*
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*/
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/**
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* struct ion_new_allocation_data - metadata passed from userspace for allocations
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* @len: size of the allocation
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* @heap_id_mask: mask of heap ids to allocate from
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* @flags: flags passed to heap
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* @handle: pointer that will be populated with a cookie to use to
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* refer to this allocation
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*
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* Provided by userspace as an argument to the ioctl - added _new to denote
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* this belongs to the new ION interface.
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*/
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struct ion_new_allocation_data {
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__u64 len;
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__u32 heap_id_mask;
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__u32 flags;
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__u32 fd;
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__u32 unused;
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};
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#define MAX_HEAP_NAME 32
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/**
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* struct ion_heap_data - data about a heap
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* @name - first 32 characters of the heap name
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* @type - heap type
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* @heap_id - heap id for the heap
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*/
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struct ion_heap_data {
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char name[MAX_HEAP_NAME];
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__u32 type;
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__u32 heap_id;
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__u32 reserved0;
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__u32 reserved1;
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__u32 reserved2;
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};
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/**
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* struct ion_heap_query - collection of data about all heaps
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* @cnt - total number of heaps to be copied
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* @heaps - buffer to copy heap data
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*/
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struct ion_heap_query {
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__u32 cnt; /* Total number of heaps to be copied */
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__u32 reserved0; /* align to 64bits */
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__u64 heaps; /* buffer to be populated */
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__u32 reserved1;
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__u32 reserved2;
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};
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#define ION_IOC_MAGIC 'I'
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/**
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* DOC: ION_IOC_NEW_ALLOC - allocate memory
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*
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* Takes an ion_allocation_data struct and returns it with the handle field
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* populated with the opaque handle for the allocation.
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* TODO: This IOCTL will clash by design; however, only one of
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* ION_IOC_ALLOC or ION_IOC_NEW_ALLOC paths will be exercised,
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* so this should not conflict.
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*/
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#define ION_IOC_NEW_ALLOC _IOWR(ION_IOC_MAGIC, 0, struct ion_new_allocation_data)
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/**
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* DOC: ION_IOC_FREE - free memory
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*
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* Takes an ion_handle_data struct and frees the handle.
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*
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* #define ION_IOC_FREE _IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data)
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* This will come from the older kernels, so don't redefine here
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*/
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/**
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* DOC: ION_IOC_SHARE - creates a file descriptor to use to share an allocation
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*
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* Takes an ion_fd_data struct with the handle field populated with a valid
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* opaque handle. Returns the struct with the fd field set to a file
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* descriptor open in the current address space. This file descriptor
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* can then be passed to another process. The corresponding opaque handle can
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* be retrieved via ION_IOC_IMPORT.
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*
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* #define ION_IOC_SHARE _IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data)
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* This will come from the older kernels, so don't redefine here
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*/
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/**
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* DOC: ION_IOC_HEAP_QUERY - information about available heaps
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*
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* Takes an ion_heap_query structure and populates information about
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* available Ion heaps.
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*/
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#define ION_IOC_HEAP_QUERY _IOWR(ION_IOC_MAGIC, 8, struct ion_heap_query)
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/**
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* DOC: ION_IOC_HEAP_ABI_VERSION - return ABI version
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*
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* Returns ABI version for this driver
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*/
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#define ION_IOC_ABI_VERSION _IOR(ION_IOC_MAGIC, 9, __u32)
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#endif /* _UAPI_LINUX_ION_NEW_H */
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