Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 1 | /* |
| 2 | * drivers/staging/android/ion/ion_priv.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 _ION_PRIV_H |
| 18 | #define _ION_PRIV_H |
| 19 | |
John Stultz | a33b2fc | 2014-02-04 16:08:40 -0800 | [diff] [blame] | 20 | #include <linux/device.h> |
Colin Cross | e946b20 | 2013-12-13 14:25:01 -0800 | [diff] [blame] | 21 | #include <linux/dma-direction.h> |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 22 | #include <linux/kref.h> |
| 23 | #include <linux/mm_types.h> |
| 24 | #include <linux/mutex.h> |
| 25 | #include <linux/rbtree.h> |
Rebecca Schultz Zavin | 5ad7bc3 | 2013-12-13 14:24:03 -0800 | [diff] [blame] | 26 | #include <linux/sched.h> |
Rebecca Schultz Zavin | 0214c7f | 2013-12-13 14:24:10 -0800 | [diff] [blame] | 27 | #include <linux/shrinker.h> |
| 28 | #include <linux/types.h> |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 29 | |
| 30 | #include "ion.h" |
| 31 | |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 32 | struct ion_buffer *ion_handle_buffer(struct ion_handle *handle); |
| 33 | |
| 34 | /** |
| 35 | * struct ion_buffer - metadata for a particular buffer |
| 36 | * @ref: refernce count |
| 37 | * @node: node in the ion_device buffers tree |
| 38 | * @dev: back pointer to the ion_device |
| 39 | * @heap: back pointer to the heap the buffer came from |
| 40 | * @flags: buffer specific flags |
| 41 | * @size: size of the buffer |
| 42 | * @priv_virt: private data to the buffer representable as |
| 43 | * a void * |
| 44 | * @priv_phys: private data to the buffer representable as |
| 45 | * an ion_phys_addr_t (and someday a phys_addr_t) |
| 46 | * @lock: protects the buffers cnt fields |
| 47 | * @kmap_cnt: number of times the buffer is mapped to the kernel |
| 48 | * @vaddr: the kenrel mapping if kmap_cnt is not zero |
| 49 | * @dmap_cnt: number of times the buffer is mapped for dma |
Rebecca Schultz Zavin | 4d5ca32 | 2013-12-13 14:23:37 -0800 | [diff] [blame] | 50 | * @sg_table: the sg table for the buffer if dmap_cnt is not zero |
Rebecca Schultz Zavin | c13bd1c | 2013-12-13 14:24:45 -0800 | [diff] [blame] | 51 | * @pages: flat array of pages in the buffer -- used by fault |
| 52 | * handler and only valid for buffers that are faulted in |
Rebecca Schultz Zavin | 5ad7bc3 | 2013-12-13 14:24:03 -0800 | [diff] [blame] | 53 | * @vmas: list of vma's mapping this buffer |
| 54 | * @handle_count: count of handles referencing this buffer |
| 55 | * @task_comm: taskcomm of last client to reference this buffer in a |
| 56 | * handle, used for debugging |
| 57 | * @pid: pid of last client to reference this buffer in a |
| 58 | * handle, used for debugging |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 59 | */ |
| 60 | struct ion_buffer { |
| 61 | struct kref ref; |
Rebecca Schultz Zavin | fe2faea | 2013-12-13 14:24:35 -0800 | [diff] [blame] | 62 | union { |
| 63 | struct rb_node node; |
| 64 | struct list_head list; |
| 65 | }; |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 66 | struct ion_device *dev; |
| 67 | struct ion_heap *heap; |
| 68 | unsigned long flags; |
| 69 | size_t size; |
| 70 | union { |
| 71 | void *priv_virt; |
| 72 | ion_phys_addr_t priv_phys; |
| 73 | }; |
| 74 | struct mutex lock; |
| 75 | int kmap_cnt; |
| 76 | void *vaddr; |
| 77 | int dmap_cnt; |
Rebecca Schultz Zavin | 4d5ca32 | 2013-12-13 14:23:37 -0800 | [diff] [blame] | 78 | struct sg_table *sg_table; |
Rebecca Schultz Zavin | c13bd1c | 2013-12-13 14:24:45 -0800 | [diff] [blame] | 79 | struct page **pages; |
Rebecca Schultz Zavin | 56a7c18 | 2013-12-13 14:23:50 -0800 | [diff] [blame] | 80 | struct list_head vmas; |
Rebecca Schultz Zavin | 5ad7bc3 | 2013-12-13 14:24:03 -0800 | [diff] [blame] | 81 | /* used to track orphaned buffers */ |
| 82 | int handle_count; |
| 83 | char task_comm[TASK_COMM_LEN]; |
| 84 | pid_t pid; |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 85 | }; |
Rebecca Schultz Zavin | ea313b5 | 2013-12-13 14:24:39 -0800 | [diff] [blame] | 86 | void ion_buffer_destroy(struct ion_buffer *buffer); |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 87 | |
| 88 | /** |
| 89 | * struct ion_heap_ops - ops to operate on a given heap |
| 90 | * @allocate: allocate memory |
| 91 | * @free: free memory |
| 92 | * @phys get physical address of a buffer (only define on |
| 93 | * physically contiguous heaps) |
| 94 | * @map_dma map the memory for dma to a scatterlist |
| 95 | * @unmap_dma unmap the memory for dma |
| 96 | * @map_kernel map memory to the kernel |
| 97 | * @unmap_kernel unmap memory to the kernel |
| 98 | * @map_user map memory to userspace |
Colin Cross | 9e90765 | 2013-12-13 14:24:49 -0800 | [diff] [blame] | 99 | * |
| 100 | * allocate, phys, and map_user return 0 on success, -errno on error. |
| 101 | * map_dma and map_kernel return pointer on success, ERR_PTR on error. |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 102 | */ |
| 103 | struct ion_heap_ops { |
Daeseok Youn | 5110898 | 2014-02-10 20:16:50 +0900 | [diff] [blame] | 104 | int (*allocate)(struct ion_heap *heap, |
| 105 | struct ion_buffer *buffer, unsigned long len, |
| 106 | unsigned long align, unsigned long flags); |
| 107 | void (*free)(struct ion_buffer *buffer); |
| 108 | int (*phys)(struct ion_heap *heap, struct ion_buffer *buffer, |
| 109 | ion_phys_addr_t *addr, size_t *len); |
| 110 | struct sg_table * (*map_dma)(struct ion_heap *heap, |
| 111 | struct ion_buffer *buffer); |
| 112 | void (*unmap_dma)(struct ion_heap *heap, struct ion_buffer *buffer); |
| 113 | void * (*map_kernel)(struct ion_heap *heap, struct ion_buffer *buffer); |
| 114 | void (*unmap_kernel)(struct ion_heap *heap, struct ion_buffer *buffer); |
| 115 | int (*map_user)(struct ion_heap *mapper, struct ion_buffer *buffer, |
| 116 | struct vm_area_struct *vma); |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 117 | }; |
| 118 | |
| 119 | /** |
Rebecca Schultz Zavin | fe2faea | 2013-12-13 14:24:35 -0800 | [diff] [blame] | 120 | * heap flags - flags between the heaps and core ion code |
| 121 | */ |
| 122 | #define ION_HEAP_FLAG_DEFER_FREE (1 << 0) |
| 123 | |
| 124 | /** |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 125 | * struct ion_heap - represents a heap in the system |
| 126 | * @node: rb node to put the heap on the device's tree of heaps |
| 127 | * @dev: back pointer to the ion_device |
| 128 | * @type: type of heap |
| 129 | * @ops: ops struct as above |
Rebecca Schultz Zavin | fe2faea | 2013-12-13 14:24:35 -0800 | [diff] [blame] | 130 | * @flags: flags |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 131 | * @id: id of heap, also indicates priority of this heap when |
| 132 | * allocating. These are specified by platform data and |
| 133 | * MUST be unique |
| 134 | * @name: used for debugging |
Rebecca Schultz Zavin | ea313b5 | 2013-12-13 14:24:39 -0800 | [diff] [blame] | 135 | * @shrinker: a shrinker for the heap, if the heap caches system |
| 136 | * memory, it must define a shrinker to return it on low |
| 137 | * memory conditions, this includes system memory cached |
| 138 | * in the deferred free lists for heaps that support it |
Rebecca Schultz Zavin | fe2faea | 2013-12-13 14:24:35 -0800 | [diff] [blame] | 139 | * @free_list: free list head if deferred free is used |
Rebecca Schultz Zavin | ea313b5 | 2013-12-13 14:24:39 -0800 | [diff] [blame] | 140 | * @free_list_size size of the deferred free list in bytes |
Rebecca Schultz Zavin | fe2faea | 2013-12-13 14:24:35 -0800 | [diff] [blame] | 141 | * @lock: protects the free list |
| 142 | * @waitqueue: queue to wait on from deferred free thread |
| 143 | * @task: task struct of deferred free thread |
Rebecca Schultz Zavin | 45b17a8 | 2013-12-13 14:24:11 -0800 | [diff] [blame] | 144 | * @debug_show: called when heap debug file is read to add any |
| 145 | * heap specific debug info to output |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 146 | * |
| 147 | * Represents a pool of memory from which buffers can be made. In some |
| 148 | * systems the only heap is regular system memory allocated via vmalloc. |
| 149 | * On others, some blocks might require large physically contiguous buffers |
| 150 | * that are allocated from a specially reserved heap. |
| 151 | */ |
| 152 | struct ion_heap { |
Rebecca Schultz Zavin | cd69488 | 2013-12-13 14:24:25 -0800 | [diff] [blame] | 153 | struct plist_node node; |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 154 | struct ion_device *dev; |
| 155 | enum ion_heap_type type; |
| 156 | struct ion_heap_ops *ops; |
Rebecca Schultz Zavin | fe2faea | 2013-12-13 14:24:35 -0800 | [diff] [blame] | 157 | unsigned long flags; |
Rebecca Schultz Zavin | cd69488 | 2013-12-13 14:24:25 -0800 | [diff] [blame] | 158 | unsigned int id; |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 159 | const char *name; |
Rebecca Schultz Zavin | ea313b5 | 2013-12-13 14:24:39 -0800 | [diff] [blame] | 160 | struct shrinker shrinker; |
Rebecca Schultz Zavin | fe2faea | 2013-12-13 14:24:35 -0800 | [diff] [blame] | 161 | struct list_head free_list; |
Rebecca Schultz Zavin | ea313b5 | 2013-12-13 14:24:39 -0800 | [diff] [blame] | 162 | size_t free_list_size; |
John Stultz | 6a72a70 | 2013-12-17 17:04:29 -0800 | [diff] [blame] | 163 | spinlock_t free_lock; |
Rebecca Schultz Zavin | fe2faea | 2013-12-13 14:24:35 -0800 | [diff] [blame] | 164 | wait_queue_head_t waitqueue; |
| 165 | struct task_struct *task; |
Rebecca Schultz Zavin | 45b17a8 | 2013-12-13 14:24:11 -0800 | [diff] [blame] | 166 | int (*debug_show)(struct ion_heap *heap, struct seq_file *, void *); |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 167 | }; |
| 168 | |
| 169 | /** |
Rebecca Schultz Zavin | 45b17a8 | 2013-12-13 14:24:11 -0800 | [diff] [blame] | 170 | * ion_buffer_cached - this ion buffer is cached |
| 171 | * @buffer: buffer |
| 172 | * |
| 173 | * indicates whether this ion buffer is cached |
| 174 | */ |
| 175 | bool ion_buffer_cached(struct ion_buffer *buffer); |
| 176 | |
| 177 | /** |
Rebecca Schultz Zavin | 13ba780 | 2013-12-13 14:24:06 -0800 | [diff] [blame] | 178 | * ion_buffer_fault_user_mappings - fault in user mappings of this buffer |
| 179 | * @buffer: buffer |
| 180 | * |
| 181 | * indicates whether userspace mappings of this buffer will be faulted |
| 182 | * in, this can affect how buffers are allocated from the heap. |
| 183 | */ |
| 184 | bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer); |
| 185 | |
| 186 | /** |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 187 | * ion_device_create - allocates and returns an ion device |
| 188 | * @custom_ioctl: arch specific ioctl function if applicable |
| 189 | * |
| 190 | * returns a valid device or -PTR_ERR |
| 191 | */ |
| 192 | struct ion_device *ion_device_create(long (*custom_ioctl) |
| 193 | (struct ion_client *client, |
| 194 | unsigned int cmd, |
| 195 | unsigned long arg)); |
| 196 | |
| 197 | /** |
| 198 | * ion_device_destroy - free and device and it's resource |
| 199 | * @dev: the device |
| 200 | */ |
| 201 | void ion_device_destroy(struct ion_device *dev); |
| 202 | |
| 203 | /** |
| 204 | * ion_device_add_heap - adds a heap to the ion device |
| 205 | * @dev: the device |
| 206 | * @heap: the heap to add |
| 207 | */ |
| 208 | void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap); |
| 209 | |
| 210 | /** |
Rebecca Schultz Zavin | 8898227 | 2013-12-13 14:24:26 -0800 | [diff] [blame] | 211 | * some helpers for common operations on buffers using the sg_table |
| 212 | * and vaddr fields |
| 213 | */ |
| 214 | void *ion_heap_map_kernel(struct ion_heap *, struct ion_buffer *); |
| 215 | void ion_heap_unmap_kernel(struct ion_heap *, struct ion_buffer *); |
| 216 | int ion_heap_map_user(struct ion_heap *, struct ion_buffer *, |
| 217 | struct vm_area_struct *); |
Rebecca Schultz Zavin | 0b6b2cd | 2013-12-13 14:24:32 -0800 | [diff] [blame] | 218 | int ion_heap_buffer_zero(struct ion_buffer *buffer); |
Colin Cross | df6cf5c | 2013-12-13 19:26:30 -0800 | [diff] [blame] | 219 | int ion_heap_pages_zero(struct page *page, size_t size, pgprot_t pgprot); |
Rebecca Schultz Zavin | 8898227 | 2013-12-13 14:24:26 -0800 | [diff] [blame] | 220 | |
Rebecca Schultz Zavin | ea313b5 | 2013-12-13 14:24:39 -0800 | [diff] [blame] | 221 | /** |
| 222 | * ion_heap_init_deferred_free -- initialize deferred free functionality |
| 223 | * @heap: the heap |
| 224 | * |
| 225 | * If a heap sets the ION_HEAP_FLAG_DEFER_FREE flag this function will |
| 226 | * be called to setup deferred frees. Calls to free the buffer will |
| 227 | * return immediately and the actual free will occur some time later |
| 228 | */ |
| 229 | int ion_heap_init_deferred_free(struct ion_heap *heap); |
| 230 | |
| 231 | /** |
| 232 | * ion_heap_freelist_add - add a buffer to the deferred free list |
| 233 | * @heap: the heap |
John Stultz | e1d855b | 2013-12-13 19:26:33 -0800 | [diff] [blame] | 234 | * @buffer: the buffer |
Rebecca Schultz Zavin | ea313b5 | 2013-12-13 14:24:39 -0800 | [diff] [blame] | 235 | * |
| 236 | * Adds an item to the deferred freelist. |
| 237 | */ |
| 238 | void ion_heap_freelist_add(struct ion_heap *heap, struct ion_buffer *buffer); |
| 239 | |
| 240 | /** |
| 241 | * ion_heap_freelist_drain - drain the deferred free list |
| 242 | * @heap: the heap |
| 243 | * @size: ammount of memory to drain in bytes |
| 244 | * |
| 245 | * Drains the indicated amount of memory from the deferred freelist immediately. |
| 246 | * Returns the total amount freed. The total freed may be higher depending |
| 247 | * on the size of the items in the list, or lower if there is insufficient |
| 248 | * total memory on the freelist. |
| 249 | */ |
| 250 | size_t ion_heap_freelist_drain(struct ion_heap *heap, size_t size); |
| 251 | |
| 252 | /** |
| 253 | * ion_heap_freelist_size - returns the size of the freelist in bytes |
| 254 | * @heap: the heap |
| 255 | */ |
| 256 | size_t ion_heap_freelist_size(struct ion_heap *heap); |
| 257 | |
Rebecca Schultz Zavin | 8898227 | 2013-12-13 14:24:26 -0800 | [diff] [blame] | 258 | |
| 259 | /** |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 260 | * functions for creating and destroying the built in ion heaps. |
| 261 | * architectures can add their own custom architecture specific |
| 262 | * heaps as appropriate. |
| 263 | */ |
| 264 | |
| 265 | struct ion_heap *ion_heap_create(struct ion_platform_heap *); |
| 266 | void ion_heap_destroy(struct ion_heap *); |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 267 | struct ion_heap *ion_system_heap_create(struct ion_platform_heap *); |
| 268 | void ion_system_heap_destroy(struct ion_heap *); |
| 269 | |
| 270 | struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *); |
| 271 | void ion_system_contig_heap_destroy(struct ion_heap *); |
| 272 | |
| 273 | struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *); |
| 274 | void ion_carveout_heap_destroy(struct ion_heap *); |
Rebecca Schultz Zavin | e3c2eb7 | 2013-12-13 14:24:27 -0800 | [diff] [blame] | 275 | |
| 276 | struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *); |
| 277 | void ion_chunk_heap_destroy(struct ion_heap *); |
Benjamin Gaignard | 349c9e1 | 2013-12-13 14:24:44 -0800 | [diff] [blame] | 278 | struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *); |
| 279 | void ion_cma_heap_destroy(struct ion_heap *); |
| 280 | |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 281 | /** |
| 282 | * kernel api to allocate/free from carveout -- used when carveout is |
| 283 | * used to back an architecture specific custom heap |
| 284 | */ |
| 285 | ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap, unsigned long size, |
| 286 | unsigned long align); |
| 287 | void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr, |
| 288 | unsigned long size); |
| 289 | /** |
| 290 | * The carveout heap returns physical addresses, since 0 may be a valid |
| 291 | * physical address, this is used to indicate allocation failed |
| 292 | */ |
| 293 | #define ION_CARVEOUT_ALLOCATE_FAIL -1 |
| 294 | |
Rebecca Schultz Zavin | 0214c7f | 2013-12-13 14:24:10 -0800 | [diff] [blame] | 295 | /** |
| 296 | * functions for creating and destroying a heap pool -- allows you |
| 297 | * to keep a pool of pre allocated memory to use from your heap. Keeping |
| 298 | * a pool of memory that is ready for dma, ie any cached mapping have been |
| 299 | * invalidated from the cache, provides a significant peformance benefit on |
| 300 | * many systems */ |
| 301 | |
| 302 | /** |
| 303 | * struct ion_page_pool - pagepool struct |
Rebecca Schultz Zavin | 0fb9b81 | 2013-12-13 14:24:13 -0800 | [diff] [blame] | 304 | * @high_count: number of highmem items in the pool |
| 305 | * @low_count: number of lowmem items in the pool |
| 306 | * @high_items: list of highmem items |
| 307 | * @low_items: list of lowmem items |
Rebecca Schultz Zavin | 0214c7f | 2013-12-13 14:24:10 -0800 | [diff] [blame] | 308 | * @shrinker: a shrinker for the items |
| 309 | * @mutex: lock protecting this struct and especially the count |
| 310 | * item list |
| 311 | * @alloc: function to be used to allocate pageory when the pool |
| 312 | * is empty |
| 313 | * @free: function to be used to free pageory back to the system |
| 314 | * when the shrinker fires |
| 315 | * @gfp_mask: gfp_mask to use from alloc |
| 316 | * @order: order of pages in the pool |
Rebecca Schultz Zavin | 797a95c | 2013-12-13 14:24:15 -0800 | [diff] [blame] | 317 | * @list: plist node for list of pools |
Rebecca Schultz Zavin | 0214c7f | 2013-12-13 14:24:10 -0800 | [diff] [blame] | 318 | * |
| 319 | * Allows you to keep a pool of pre allocated pages to use from your heap. |
| 320 | * Keeping a pool of pages that is ready for dma, ie any cached mapping have |
| 321 | * been invalidated from the cache, provides a significant peformance benefit |
| 322 | * on many systems |
| 323 | */ |
| 324 | struct ion_page_pool { |
Rebecca Schultz Zavin | 0fb9b81 | 2013-12-13 14:24:13 -0800 | [diff] [blame] | 325 | int high_count; |
| 326 | int low_count; |
| 327 | struct list_head high_items; |
| 328 | struct list_head low_items; |
Rebecca Schultz Zavin | 0214c7f | 2013-12-13 14:24:10 -0800 | [diff] [blame] | 329 | struct mutex mutex; |
Rebecca Schultz Zavin | 0214c7f | 2013-12-13 14:24:10 -0800 | [diff] [blame] | 330 | gfp_t gfp_mask; |
| 331 | unsigned int order; |
Rebecca Schultz Zavin | 797a95c | 2013-12-13 14:24:15 -0800 | [diff] [blame] | 332 | struct plist_node list; |
Rebecca Schultz Zavin | 0214c7f | 2013-12-13 14:24:10 -0800 | [diff] [blame] | 333 | }; |
| 334 | |
| 335 | struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order); |
| 336 | void ion_page_pool_destroy(struct ion_page_pool *); |
| 337 | void *ion_page_pool_alloc(struct ion_page_pool *); |
| 338 | void ion_page_pool_free(struct ion_page_pool *, struct page *); |
| 339 | |
Rebecca Schultz Zavin | ea313b5 | 2013-12-13 14:24:39 -0800 | [diff] [blame] | 340 | /** ion_page_pool_shrink - shrinks the size of the memory cached in the pool |
| 341 | * @pool: the pool |
| 342 | * @gfp_mask: the memory type to reclaim |
| 343 | * @nr_to_scan: number of items to shrink in pages |
| 344 | * |
| 345 | * returns the number of items freed in pages |
| 346 | */ |
| 347 | int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask, |
| 348 | int nr_to_scan); |
| 349 | |
Colin Cross | e946b20 | 2013-12-13 14:25:01 -0800 | [diff] [blame] | 350 | /** |
| 351 | * ion_pages_sync_for_device - cache flush pages for use with the specified |
| 352 | * device |
| 353 | * @dev: the device the pages will be used with |
| 354 | * @page: the first page to be flushed |
| 355 | * @size: size in bytes of region to be flushed |
| 356 | * @dir: direction of dma transfer |
| 357 | */ |
| 358 | void ion_pages_sync_for_device(struct device *dev, struct page *page, |
| 359 | size_t size, enum dma_data_direction dir); |
| 360 | |
Rebecca Schultz Zavin | c30707b | 2013-12-13 19:38:38 -0800 | [diff] [blame] | 361 | #endif /* _ION_PRIV_H */ |