2 * drivers/staging/android/ion/ion_priv.h
4 * Copyright (C) 2011 Google, Inc.
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.
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.
20 #include <linux/device.h>
21 #include <linux/dma-direction.h>
22 #include <linux/kref.h>
23 #include <linux/mm_types.h>
24 #include <linux/mutex.h>
25 #include <linux/rbtree.h>
26 #include <linux/sched.h>
27 #include <linux/shrinker.h>
28 #include <linux/types.h>
29 #ifdef CONFIG_ION_POOL_CACHE_POLICY
30 #include <asm/cacheflush.h>
35 struct ion_buffer *ion_handle_buffer(struct ion_handle *handle);
37 #ifdef CONFIG_RK_IOMMU
39 * struct ion_iommu_map - represents a mapping of an ion buffer to an iommu
40 * @iova_addr - iommu virtual address
41 * @node - rb node to exist in the buffer's tree of iommu mappings
42 * @key - contains the iommu device info
43 * @ref - for reference counting this mapping
44 * @mapped_size - size of the iova space mapped
45 * (may not be the same as the buffer size)
47 * Represents a mapping of one ion buffer to a particular iommu domain
48 * and address range. There may exist other mappings of this buffer in
49 * different domains or address ranges. All mappings will have the same
50 * cacheability and security.
52 struct ion_iommu_map {
53 unsigned long iova_addr;
56 struct ion_buffer *buffer;
63 * struct ion_buffer - metadata for a particular buffer
64 * @ref: reference count
65 * @node: node in the ion_device buffers tree
66 * @dev: back pointer to the ion_device
67 * @heap: back pointer to the heap the buffer came from
68 * @flags: buffer specific flags
69 * @private_flags: internal buffer specific flags
70 * @size: size of the buffer
71 * @priv_virt: private data to the buffer representable as
73 * @priv_phys: private data to the buffer representable as
74 * an ion_phys_addr_t (and someday a phys_addr_t)
75 * @lock: protects the buffers cnt fields
76 * @kmap_cnt: number of times the buffer is mapped to the kernel
77 * @vaddr: the kernel mapping if kmap_cnt is not zero
78 * @dmap_cnt: number of times the buffer is mapped for dma
79 * @sg_table: the sg table for the buffer if dmap_cnt is not zero
80 * @pages: flat array of pages in the buffer -- used by fault
81 * handler and only valid for buffers that are faulted in
82 * @vmas: list of vma's mapping this buffer
83 * @handle_count: count of handles referencing this buffer
84 * @task_comm: taskcomm of last client to reference this buffer in a
85 * handle, used for debugging
86 * @pid: pid of last client to reference this buffer in a
87 * handle, used for debugging
93 struct list_head list;
95 struct ion_device *dev;
96 struct ion_heap *heap;
98 unsigned long private_flags;
102 ion_phys_addr_t priv_phys;
108 struct sg_table *sg_table;
110 struct list_head vmas;
111 /* used to track orphaned buffers */
113 char task_comm[TASK_COMM_LEN];
115 #ifdef CONFIG_RK_IOMMU
116 unsigned int iommu_map_cnt;
117 struct rb_root iommu_maps;
120 void ion_buffer_destroy(struct ion_buffer *buffer);
123 * struct ion_heap_ops - ops to operate on a given heap
124 * @allocate: allocate memory
126 * @phys get physical address of a buffer (only define on
127 * physically contiguous heaps)
128 * @map_dma map the memory for dma to a scatterlist
129 * @unmap_dma unmap the memory for dma
130 * @map_kernel map memory to the kernel
131 * @unmap_kernel unmap memory to the kernel
132 * @map_user map memory to userspace
134 * allocate, phys, and map_user return 0 on success, -errno on error.
135 * map_dma and map_kernel return pointer on success, ERR_PTR on
136 * error. @free will be called with ION_PRIV_FLAG_SHRINKER_FREE set in
137 * the buffer's private_flags when called from a shrinker. In that
138 * case, the pages being free'd must be truly free'd back to the
139 * system, not put in a page pool or otherwise cached.
141 struct ion_heap_ops {
142 int (*allocate)(struct ion_heap *heap,
143 struct ion_buffer *buffer, unsigned long len,
144 unsigned long align, unsigned long flags);
145 void (*free)(struct ion_buffer *buffer);
146 int (*phys)(struct ion_heap *heap, struct ion_buffer *buffer,
147 ion_phys_addr_t *addr, size_t *len);
148 struct sg_table * (*map_dma)(struct ion_heap *heap,
149 struct ion_buffer *buffer);
150 void (*unmap_dma)(struct ion_heap *heap, struct ion_buffer *buffer);
151 void * (*map_kernel)(struct ion_heap *heap, struct ion_buffer *buffer);
152 void (*unmap_kernel)(struct ion_heap *heap, struct ion_buffer *buffer);
153 int (*map_user)(struct ion_heap *mapper, struct ion_buffer *buffer,
154 struct vm_area_struct *vma);
155 int (*shrink)(struct ion_heap *heap, gfp_t gfp_mask, int nr_to_scan);
156 #ifdef CONFIG_RK_IOMMU
157 int (*map_iommu)(struct ion_buffer *buffer,
158 struct device *iommu_dev,
159 struct ion_iommu_map *map_data,
160 unsigned long iova_length,
161 unsigned long flags);
162 void (*unmap_iommu)(struct device *iommu_dev,
163 struct ion_iommu_map *data);
168 * heap flags - flags between the heaps and core ion code
170 #define ION_HEAP_FLAG_DEFER_FREE (1 << 0)
173 * private flags - flags internal to ion
176 * Buffer is being freed from a shrinker function. Skip any possible
177 * heap-specific caching mechanism (e.g. page pools). Guarantees that
178 * any buffer storage that came from the system allocator will be
179 * returned to the system allocator.
181 #define ION_PRIV_FLAG_SHRINKER_FREE (1 << 0)
184 * struct ion_heap - represents a heap in the system
185 * @node: rb node to put the heap on the device's tree of heaps
186 * @dev: back pointer to the ion_device
187 * @type: type of heap
188 * @ops: ops struct as above
190 * @id: id of heap, also indicates priority of this heap when
191 * allocating. These are specified by platform data and
193 * @name: used for debugging
194 * @shrinker: a shrinker for the heap
195 * @free_list: free list head if deferred free is used
196 * @free_list_size size of the deferred free list in bytes
197 * @lock: protects the free list
198 * @waitqueue: queue to wait on from deferred free thread
199 * @task: task struct of deferred free thread
200 * @debug_show: called when heap debug file is read to add any
201 * heap specific debug info to output
203 * Represents a pool of memory from which buffers can be made. In some
204 * systems the only heap is regular system memory allocated via vmalloc.
205 * On others, some blocks might require large physically contiguous buffers
206 * that are allocated from a specially reserved heap.
209 struct plist_node node;
210 struct ion_device *dev;
211 enum ion_heap_type type;
212 struct ion_heap_ops *ops;
216 struct shrinker shrinker;
217 struct list_head free_list;
218 size_t free_list_size;
219 spinlock_t free_lock;
220 wait_queue_head_t waitqueue;
221 struct task_struct *task;
223 int (*debug_show)(struct ion_heap *heap, struct seq_file *, void *);
227 * ion_buffer_cached - this ion buffer is cached
230 * indicates whether this ion buffer is cached
232 bool ion_buffer_cached(struct ion_buffer *buffer);
235 * ion_buffer_fault_user_mappings - fault in user mappings of this buffer
238 * indicates whether userspace mappings of this buffer will be faulted
239 * in, this can affect how buffers are allocated from the heap.
241 bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer);
244 * ion_device_create - allocates and returns an ion device
245 * @custom_ioctl: arch specific ioctl function if applicable
247 * returns a valid device or -PTR_ERR
249 struct ion_device *ion_device_create(long (*custom_ioctl)
250 (struct ion_client *client,
255 * ion_device_destroy - free and device and it's resource
258 void ion_device_destroy(struct ion_device *dev);
261 * ion_device_add_heap - adds a heap to the ion device
263 * @heap: the heap to add
265 void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap);
268 * some helpers for common operations on buffers using the sg_table
271 void *ion_heap_map_kernel(struct ion_heap *, struct ion_buffer *);
272 void ion_heap_unmap_kernel(struct ion_heap *, struct ion_buffer *);
273 int ion_heap_map_user(struct ion_heap *, struct ion_buffer *,
274 struct vm_area_struct *);
275 int ion_heap_buffer_zero(struct ion_buffer *buffer);
276 int ion_heap_pages_zero(struct page *page, size_t size, pgprot_t pgprot);
279 * ion_heap_init_shrinker
282 * If a heap sets the ION_HEAP_FLAG_DEFER_FREE flag or defines the shrink op
283 * this function will be called to setup a shrinker to shrink the freelists
284 * and call the heap's shrink op.
286 void ion_heap_init_shrinker(struct ion_heap *heap);
289 * ion_heap_init_deferred_free -- initialize deferred free functionality
292 * If a heap sets the ION_HEAP_FLAG_DEFER_FREE flag this function will
293 * be called to setup deferred frees. Calls to free the buffer will
294 * return immediately and the actual free will occur some time later
296 int ion_heap_init_deferred_free(struct ion_heap *heap);
299 * ion_heap_freelist_add - add a buffer to the deferred free list
301 * @buffer: the buffer
303 * Adds an item to the deferred freelist.
305 void ion_heap_freelist_add(struct ion_heap *heap, struct ion_buffer *buffer);
308 * ion_heap_freelist_drain - drain the deferred free list
310 * @size: amount of memory to drain in bytes
312 * Drains the indicated amount of memory from the deferred freelist immediately.
313 * Returns the total amount freed. The total freed may be higher depending
314 * on the size of the items in the list, or lower if there is insufficient
315 * total memory on the freelist.
317 size_t ion_heap_freelist_drain(struct ion_heap *heap, size_t size);
320 * ion_heap_freelist_shrink - drain the deferred free
321 * list, skipping any heap-specific
322 * pooling or caching mechanisms
325 * @size: amount of memory to drain in bytes
327 * Drains the indicated amount of memory from the deferred freelist immediately.
328 * Returns the total amount freed. The total freed may be higher depending
329 * on the size of the items in the list, or lower if there is insufficient
330 * total memory on the freelist.
332 * Unlike with @ion_heap_freelist_drain, don't put any pages back into
333 * page pools or otherwise cache the pages. Everything must be
334 * genuinely free'd back to the system. If you're free'ing from a
335 * shrinker you probably want to use this. Note that this relies on
336 * the heap.ops.free callback honoring the ION_PRIV_FLAG_SHRINKER_FREE
339 size_t ion_heap_freelist_shrink(struct ion_heap *heap,
343 * ion_heap_freelist_size - returns the size of the freelist in bytes
346 size_t ion_heap_freelist_size(struct ion_heap *heap);
350 * functions for creating and destroying the built in ion heaps.
351 * architectures can add their own custom architecture specific
352 * heaps as appropriate.
355 struct ion_heap *ion_heap_create(struct ion_platform_heap *);
356 void ion_heap_destroy(struct ion_heap *);
357 struct ion_heap *ion_system_heap_create(struct ion_platform_heap *);
358 void ion_system_heap_destroy(struct ion_heap *);
360 struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *);
361 void ion_system_contig_heap_destroy(struct ion_heap *);
363 struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *);
364 void ion_carveout_heap_destroy(struct ion_heap *);
366 struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *);
367 void ion_chunk_heap_destroy(struct ion_heap *);
368 struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *);
369 void ion_cma_heap_destroy(struct ion_heap *);
372 * kernel api to allocate/free from carveout -- used when carveout is
373 * used to back an architecture specific custom heap
375 ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap, unsigned long size,
376 unsigned long align);
377 void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
380 * The carveout heap returns physical addresses, since 0 may be a valid
381 * physical address, this is used to indicate allocation failed
383 #define ION_CARVEOUT_ALLOCATE_FAIL -1
386 * functions for creating and destroying a heap pool -- allows you
387 * to keep a pool of pre allocated memory to use from your heap. Keeping
388 * a pool of memory that is ready for dma, ie any cached mapping have been
389 * invalidated from the cache, provides a significant performance benefit on
394 * struct ion_page_pool - pagepool struct
395 * @high_count: number of highmem items in the pool
396 * @low_count: number of lowmem items in the pool
397 * @high_items: list of highmem items
398 * @low_items: list of lowmem items
399 * @mutex: lock protecting this struct and especially the count
401 * @gfp_mask: gfp_mask to use from alloc
402 * @order: order of pages in the pool
403 * @list: plist node for list of pools
405 * Allows you to keep a pool of pre allocated pages to use from your heap.
406 * Keeping a pool of pages that is ready for dma, ie any cached mapping have
407 * been invalidated from the cache, provides a significant performance benefit
410 struct ion_page_pool {
413 struct list_head high_items;
414 struct list_head low_items;
418 struct plist_node list;
421 struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order);
422 void ion_page_pool_destroy(struct ion_page_pool *);
423 struct page *ion_page_pool_alloc(struct ion_page_pool *);
424 void ion_page_pool_free(struct ion_page_pool *, struct page *);
425 void ion_page_pool_free_immediate(struct ion_page_pool *, struct page *);
427 #ifdef CONFIG_ION_POOL_CACHE_POLICY
428 static inline void ion_page_pool_alloc_set_cache_policy
429 (struct ion_page_pool *pool,
431 void *va = page_address(page);
434 set_memory_wc((unsigned long)va, 1 << pool->order);
437 static inline void ion_page_pool_free_set_cache_policy
438 (struct ion_page_pool *pool,
440 void *va = page_address(page);
443 set_memory_wb((unsigned long)va, 1 << pool->order);
447 static inline void ion_page_pool_alloc_set_cache_policy
448 (struct ion_page_pool *pool,
449 struct page *page){ }
451 static inline void ion_page_pool_free_set_cache_policy
452 (struct ion_page_pool *pool,
453 struct page *page){ }
457 /** ion_page_pool_shrink - shrinks the size of the memory cached in the pool
459 * @gfp_mask: the memory type to reclaim
460 * @nr_to_scan: number of items to shrink in pages
462 * returns the number of items freed in pages
464 int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
468 * ion_pages_sync_for_device - cache flush pages for use with the specified
470 * @dev: the device the pages will be used with
471 * @page: the first page to be flushed
472 * @size: size in bytes of region to be flushed
473 * @dir: direction of dma transfer
475 void ion_pages_sync_for_device(struct device *dev, struct page *page,
476 size_t size, enum dma_data_direction dir);
478 #endif /* _ION_PRIV_H */