Colin Cross | c3a2fe0 | 2013-12-13 14:24:57 -0800 | [diff] [blame] | 1 | /* |
| 2 | * 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_H |
| 18 | #define _UAPI_LINUX_ION_H |
| 19 | |
| 20 | #include <linux/ioctl.h> |
| 21 | #include <linux/types.h> |
| 22 | |
| 23 | typedef int ion_user_handle_t; |
| 24 | |
| 25 | /** |
| 26 | * enum ion_heap_types - list of all possible types of heaps |
| 27 | * @ION_HEAP_TYPE_SYSTEM: memory allocated via vmalloc |
| 28 | * @ION_HEAP_TYPE_SYSTEM_CONTIG: memory allocated via kmalloc |
| 29 | * @ION_HEAP_TYPE_CARVEOUT: memory allocated from a prereserved |
Seunghun Lee | 53d719f | 2014-04-17 00:39:44 +0900 | [diff] [blame] | 30 | * carveout heap, allocations are physically |
| 31 | * contiguous |
Colin Cross | c3a2fe0 | 2013-12-13 14:24:57 -0800 | [diff] [blame] | 32 | * @ION_HEAP_TYPE_DMA: memory allocated via DMA API |
| 33 | * @ION_NUM_HEAPS: helper for iterating over heaps, a bit mask |
Seunghun Lee | 53d719f | 2014-04-17 00:39:44 +0900 | [diff] [blame] | 34 | * is used to identify the heaps, so only 32 |
| 35 | * total heap types are supported |
Colin Cross | c3a2fe0 | 2013-12-13 14:24:57 -0800 | [diff] [blame] | 36 | */ |
| 37 | enum ion_heap_type { |
| 38 | ION_HEAP_TYPE_SYSTEM, |
| 39 | ION_HEAP_TYPE_SYSTEM_CONTIG, |
| 40 | ION_HEAP_TYPE_CARVEOUT, |
| 41 | ION_HEAP_TYPE_CHUNK, |
| 42 | ION_HEAP_TYPE_DMA, |
Sriram Raghunathan | 7e41617 | 2015-09-22 22:35:51 +0530 | [diff] [blame] | 43 | ION_HEAP_TYPE_CUSTOM, /* |
| 44 | * must be last so device specific heaps always |
| 45 | * are at the end of this enum |
| 46 | */ |
Patrick Daly | 7e8cbb4 | 2016-11-01 18:37:42 -0700 | [diff] [blame] | 47 | ION_NUM_HEAPS = 16, |
Colin Cross | c3a2fe0 | 2013-12-13 14:24:57 -0800 | [diff] [blame] | 48 | }; |
| 49 | |
Patrick Daly | 7e8cbb4 | 2016-11-01 18:37:42 -0700 | [diff] [blame] | 50 | #define ION_HEAP_SYSTEM_MASK ((1 << ION_HEAP_TYPE_SYSTEM)) |
| 51 | #define ION_HEAP_SYSTEM_CONTIG_MASK ((1 << ION_HEAP_TYPE_SYSTEM_CONTIG)) |
| 52 | #define ION_HEAP_CARVEOUT_MASK ((1 << ION_HEAP_TYPE_CARVEOUT)) |
| 53 | #define ION_HEAP_TYPE_DMA_MASK ((1 << ION_HEAP_TYPE_DMA)) |
| 54 | |
Seunghun Lee | 53d719f | 2014-04-17 00:39:44 +0900 | [diff] [blame] | 55 | #define ION_NUM_HEAP_IDS (sizeof(unsigned int) * 8) |
Colin Cross | c3a2fe0 | 2013-12-13 14:24:57 -0800 | [diff] [blame] | 56 | |
| 57 | /** |
| 58 | * allocation flags - the lower 16 bits are used by core ion, the upper 16 |
| 59 | * bits are reserved for use by the heaps themselves. |
| 60 | */ |
Patrick Daly | 7e8cbb4 | 2016-11-01 18:37:42 -0700 | [diff] [blame] | 61 | #define ION_FLAG_CACHED 1 /* |
| 62 | * mappings of this buffer should be |
| 63 | * cached, ion will do cache |
| 64 | * maintenance when the buffer is |
| 65 | * mapped for dma |
| 66 | */ |
| 67 | #define ION_FLAG_CACHED_NEEDS_SYNC 2 /* |
| 68 | * mappings of this buffer will created |
| 69 | * at mmap time, if this is set |
| 70 | * caches must be managed |
| 71 | * manually |
| 72 | */ |
Colin Cross | c3a2fe0 | 2013-12-13 14:24:57 -0800 | [diff] [blame] | 73 | |
| 74 | /** |
| 75 | * DOC: Ion Userspace API |
| 76 | * |
| 77 | * create a client by opening /dev/ion |
| 78 | * most operations handled via following ioctls |
| 79 | * |
| 80 | */ |
| 81 | |
| 82 | /** |
| 83 | * struct ion_allocation_data - metadata passed from userspace for allocations |
| 84 | * @len: size of the allocation |
| 85 | * @align: required alignment of the allocation |
| 86 | * @heap_id_mask: mask of heap ids to allocate from |
| 87 | * @flags: flags passed to heap |
Seunghun Lee | 53d719f | 2014-04-17 00:39:44 +0900 | [diff] [blame] | 88 | * @handle: pointer that will be populated with a cookie to use to |
Colin Cross | c3a2fe0 | 2013-12-13 14:24:57 -0800 | [diff] [blame] | 89 | * refer to this allocation |
| 90 | * |
| 91 | * Provided by userspace as an argument to the ioctl |
| 92 | */ |
| 93 | struct ion_allocation_data { |
| 94 | size_t len; |
| 95 | size_t align; |
| 96 | unsigned int heap_id_mask; |
| 97 | unsigned int flags; |
| 98 | ion_user_handle_t handle; |
| 99 | }; |
| 100 | |
| 101 | /** |
| 102 | * struct ion_fd_data - metadata passed to/from userspace for a handle/fd pair |
| 103 | * @handle: a handle |
| 104 | * @fd: a file descriptor representing that handle |
| 105 | * |
| 106 | * For ION_IOC_SHARE or ION_IOC_MAP userspace populates the handle field with |
| 107 | * the handle returned from ion alloc, and the kernel returns the file |
| 108 | * descriptor to share or map in the fd field. For ION_IOC_IMPORT, userspace |
| 109 | * provides the file descriptor and the kernel returns the handle. |
| 110 | */ |
| 111 | struct ion_fd_data { |
| 112 | ion_user_handle_t handle; |
| 113 | int fd; |
| 114 | }; |
| 115 | |
| 116 | /** |
| 117 | * struct ion_handle_data - a handle passed to/from the kernel |
| 118 | * @handle: a handle |
| 119 | */ |
| 120 | struct ion_handle_data { |
| 121 | ion_user_handle_t handle; |
| 122 | }; |
| 123 | |
| 124 | /** |
| 125 | * struct ion_custom_data - metadata passed to/from userspace for a custom ioctl |
| 126 | * @cmd: the custom ioctl function to call |
| 127 | * @arg: additional data to pass to the custom ioctl, typically a user |
| 128 | * pointer to a predefined structure |
| 129 | * |
| 130 | * This works just like the regular cmd and arg fields of an ioctl. |
| 131 | */ |
| 132 | struct ion_custom_data { |
| 133 | unsigned int cmd; |
| 134 | unsigned long arg; |
| 135 | }; |
| 136 | |
| 137 | #define ION_IOC_MAGIC 'I' |
| 138 | |
| 139 | /** |
| 140 | * DOC: ION_IOC_ALLOC - allocate memory |
| 141 | * |
| 142 | * Takes an ion_allocation_data struct and returns it with the handle field |
| 143 | * populated with the opaque handle for the allocation. |
| 144 | */ |
| 145 | #define ION_IOC_ALLOC _IOWR(ION_IOC_MAGIC, 0, \ |
| 146 | struct ion_allocation_data) |
| 147 | |
| 148 | /** |
| 149 | * DOC: ION_IOC_FREE - free memory |
| 150 | * |
| 151 | * Takes an ion_handle_data struct and frees the handle. |
| 152 | */ |
| 153 | #define ION_IOC_FREE _IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data) |
| 154 | |
| 155 | /** |
| 156 | * DOC: ION_IOC_MAP - get a file descriptor to mmap |
| 157 | * |
| 158 | * Takes an ion_fd_data struct with the handle field populated with a valid |
| 159 | * opaque handle. Returns the struct with the fd field set to a file |
| 160 | * descriptor open in the current address space. This file descriptor |
| 161 | * can then be used as an argument to mmap. |
| 162 | */ |
| 163 | #define ION_IOC_MAP _IOWR(ION_IOC_MAGIC, 2, struct ion_fd_data) |
| 164 | |
| 165 | /** |
| 166 | * DOC: ION_IOC_SHARE - creates a file descriptor to use to share an allocation |
| 167 | * |
| 168 | * Takes an ion_fd_data struct with the handle field populated with a valid |
| 169 | * opaque handle. Returns the struct with the fd field set to a file |
| 170 | * descriptor open in the current address space. This file descriptor |
| 171 | * can then be passed to another process. The corresponding opaque handle can |
| 172 | * be retrieved via ION_IOC_IMPORT. |
| 173 | */ |
| 174 | #define ION_IOC_SHARE _IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data) |
| 175 | |
| 176 | /** |
| 177 | * DOC: ION_IOC_IMPORT - imports a shared file descriptor |
| 178 | * |
| 179 | * Takes an ion_fd_data struct with the fd field populated with a valid file |
| 180 | * descriptor obtained from ION_IOC_SHARE and returns the struct with the handle |
| 181 | * filed set to the corresponding opaque handle. |
| 182 | */ |
| 183 | #define ION_IOC_IMPORT _IOWR(ION_IOC_MAGIC, 5, struct ion_fd_data) |
| 184 | |
| 185 | /** |
| 186 | * DOC: ION_IOC_SYNC - syncs a shared file descriptors to memory |
| 187 | * |
| 188 | * Deprecated in favor of using the dma_buf api's correctly (syncing |
Carlos E. Garcia | 69e98df | 2015-04-24 09:40:42 -0400 | [diff] [blame] | 189 | * will happen automatically when the buffer is mapped to a device). |
Colin Cross | c3a2fe0 | 2013-12-13 14:24:57 -0800 | [diff] [blame] | 190 | * If necessary should be used after touching a cached buffer from the cpu, |
| 191 | * this will make the buffer in memory coherent. |
| 192 | */ |
| 193 | #define ION_IOC_SYNC _IOWR(ION_IOC_MAGIC, 7, struct ion_fd_data) |
| 194 | |
| 195 | /** |
| 196 | * DOC: ION_IOC_CUSTOM - call architecture specific ion ioctl |
| 197 | * |
| 198 | * Takes the argument of the architecture specific ioctl to call and |
| 199 | * passes appropriate userdata for that ioctl |
| 200 | */ |
| 201 | #define ION_IOC_CUSTOM _IOWR(ION_IOC_MAGIC, 6, struct ion_custom_data) |
| 202 | |
Colin Cross | c3a2fe0 | 2013-12-13 14:24:57 -0800 | [diff] [blame] | 203 | #endif /* _UAPI_LINUX_ION_H */ |