1 /* 2 * Adapted from drivers/staging/android/uapi/ion.h 3 * 4 * Copyright (C) 2011 Google, Inc. 5 * 6 * This software is licensed under the terms of the GNU General Public 7 * License version 2, as published by the Free Software Foundation, and 8 * may be copied, distributed, and modified under those terms. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 */ 16 17 #ifndef _UAPI_LINUX_ION_NEW_H 18 #define _UAPI_LINUX_ION_NEW_H 19 20 #include <linux/ioctl.h> 21 #include <linux/types.h> 22 23 #define ION_NUM_HEAP_IDS (sizeof(unsigned int) * 8) 24 25 /** 26 * DOC: Ion Userspace API 27 * 28 * create a client by opening /dev/ion 29 * most operations handled via following ioctls 30 * 31 */ 32 33 /** 34 * struct ion_new_allocation_data - metadata passed from userspace for allocations 35 * @len: size of the allocation 36 * @heap_id_mask: mask of heap ids to allocate from 37 * @flags: flags passed to heap 38 * @handle: pointer that will be populated with a cookie to use to 39 * refer to this allocation 40 * 41 * Provided by userspace as an argument to the ioctl - added _new to denote 42 * this belongs to the new ION interface. 43 */ 44 struct ion_new_allocation_data { 45 __u64 len; 46 __u32 heap_id_mask; 47 __u32 flags; 48 __u32 fd; 49 __u32 unused; 50 }; 51 52 #define MAX_HEAP_NAME 32 53 54 /** 55 * struct ion_heap_data - data about a heap 56 * @name - first 32 characters of the heap name 57 * @type - heap type 58 * @heap_id - heap id for the heap 59 */ 60 struct ion_heap_data { 61 char name[MAX_HEAP_NAME]; 62 __u32 type; 63 __u32 heap_id; 64 __u32 reserved0; 65 __u32 reserved1; 66 __u32 reserved2; 67 }; 68 69 /** 70 * struct ion_heap_query - collection of data about all heaps 71 * @cnt - total number of heaps to be copied 72 * @heaps - buffer to copy heap data 73 */ 74 struct ion_heap_query { 75 __u32 cnt; /* Total number of heaps to be copied */ 76 __u32 reserved0; /* align to 64bits */ 77 __u64 heaps; /* buffer to be populated */ 78 __u32 reserved1; 79 __u32 reserved2; 80 }; 81 82 #define ION_IOC_MAGIC 'I' 83 84 /** 85 * DOC: ION_IOC_NEW_ALLOC - allocate memory 86 * 87 * Takes an ion_allocation_data struct and returns it with the handle field 88 * populated with the opaque handle for the allocation. 89 * TODO: This IOCTL will clash by design; however, only one of 90 * ION_IOC_ALLOC or ION_IOC_NEW_ALLOC paths will be exercised, 91 * so this should not conflict. 92 */ 93 #define ION_IOC_NEW_ALLOC _IOWR(ION_IOC_MAGIC, 0, struct ion_new_allocation_data) 94 95 /** 96 * DOC: ION_IOC_FREE - free memory 97 * 98 * Takes an ion_handle_data struct and frees the handle. 99 * 100 * #define ION_IOC_FREE _IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data) 101 * This will come from the older kernels, so don't redefine here 102 */ 103 104 /** 105 * DOC: ION_IOC_SHARE - creates a file descriptor to use to share an allocation 106 * 107 * Takes an ion_fd_data struct with the handle field populated with a valid 108 * opaque handle. Returns the struct with the fd field set to a file 109 * descriptor open in the current address space. This file descriptor 110 * can then be passed to another process. The corresponding opaque handle can 111 * be retrieved via ION_IOC_IMPORT. 112 * 113 * #define ION_IOC_SHARE _IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data) 114 * This will come from the older kernels, so don't redefine here 115 */ 116 117 /** 118 * DOC: ION_IOC_HEAP_QUERY - information about available heaps 119 * 120 * Takes an ion_heap_query structure and populates information about 121 * available Ion heaps. 122 */ 123 #define ION_IOC_HEAP_QUERY _IOWR(ION_IOC_MAGIC, 8, struct ion_heap_query) 124 125 #endif /* _UAPI_LINUX_ION_NEW_H */ 126
