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134 lines
3.4 KiB
134 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* ion.h |
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* |
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* Copyright (C) 2011 Google, Inc. |
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*/ |
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/* This file is copied from drivers/staging/android/uapi/ion.h |
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* This local copy is required for the selftest to pass, when build |
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* outside the kernel source tree. |
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* Please keep this file in sync with its original file until the |
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* ion driver is moved outside the staging tree. |
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*/ |
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#ifndef _UAPI_LINUX_ION_H |
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#define _UAPI_LINUX_ION_H |
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#include <linux/ioctl.h> |
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#include <linux/types.h> |
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/** |
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* enum ion_heap_types - list of all possible types of heaps |
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* @ION_HEAP_TYPE_SYSTEM: memory allocated via vmalloc |
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* @ION_HEAP_TYPE_SYSTEM_CONTIG: memory allocated via kmalloc |
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* @ION_HEAP_TYPE_CARVEOUT: memory allocated from a prereserved |
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* carveout heap, allocations are physically |
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* contiguous |
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* @ION_HEAP_TYPE_DMA: memory allocated via DMA API |
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* @ION_NUM_HEAPS: helper for iterating over heaps, a bit mask |
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* is used to identify the heaps, so only 32 |
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* total heap types are supported |
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*/ |
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enum ion_heap_type { |
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ION_HEAP_TYPE_SYSTEM, |
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ION_HEAP_TYPE_SYSTEM_CONTIG, |
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ION_HEAP_TYPE_CARVEOUT, |
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ION_HEAP_TYPE_CHUNK, |
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ION_HEAP_TYPE_DMA, |
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ION_HEAP_TYPE_CUSTOM, /* |
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* must be last so device specific heaps always |
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* are at the end of this enum |
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*/ |
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}; |
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#define ION_NUM_HEAP_IDS (sizeof(unsigned int) * 8) |
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/** |
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* allocation flags - the lower 16 bits are used by core ion, the upper 16 |
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* bits are reserved for use by the heaps themselves. |
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*/ |
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/* |
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* mappings of this buffer should be cached, ion will do cache maintenance |
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* when the buffer is mapped for dma |
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*/ |
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#define ION_FLAG_CACHED 1 |
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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_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 |
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*/ |
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struct ion_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_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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*/ |
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#define ION_IOC_ALLOC _IOWR(ION_IOC_MAGIC, 0, \ |
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struct ion_allocation_data) |
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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, \ |
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struct ion_heap_query) |
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#endif /* _UAPI_LINUX_ION_H */
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