2 * drivers/staging/android/ion/ion_system_heap.c
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.
18 #include <linux/dma-mapping.h>
19 #include <linux/err.h>
20 #include <linux/highmem.h>
22 #include <linux/scatterlist.h>
23 #include <linux/seq_file.h>
24 #include <linux/slab.h>
25 #include <linux/vmalloc.h>
29 static gfp_t high_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN |
30 __GFP_NORETRY) & ~__GFP_WAIT;
31 static gfp_t low_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN);
32 static const unsigned int orders[] = {8, 4, 0};
33 static const int num_orders = ARRAY_SIZE(orders);
34 static int order_to_index(unsigned int order)
37 for (i = 0; i < num_orders; i++)
38 if (order == orders[i])
44 static unsigned int order_to_size(int order)
46 return PAGE_SIZE << order;
49 struct ion_system_heap {
51 struct ion_page_pool **pools;
57 struct list_head list;
60 static struct page *alloc_buffer_page(struct ion_system_heap *heap,
61 struct ion_buffer *buffer,
64 bool cached = ion_buffer_cached(buffer);
65 struct ion_page_pool *pool = heap->pools[order_to_index(order)];
69 page = ion_page_pool_alloc(pool);
71 gfp_t gfp_flags = low_order_gfp_flags;
74 gfp_flags = high_order_gfp_flags;
75 page = alloc_pages(gfp_flags, order);
78 ion_pages_sync_for_device(NULL, page, PAGE_SIZE << order,
87 static void free_buffer_page(struct ion_system_heap *heap,
88 struct ion_buffer *buffer, struct page *page,
91 bool cached = ion_buffer_cached(buffer);
94 struct ion_page_pool *pool = heap->pools[order_to_index(order)];
95 ion_page_pool_free(pool, page);
97 __free_pages(page, order);
102 static struct page_info *alloc_largest_available(struct ion_system_heap *heap,
103 struct ion_buffer *buffer,
105 unsigned int max_order)
108 struct page_info *info;
111 info = kmalloc(sizeof(struct page_info), GFP_KERNEL);
115 for (i = 0; i < num_orders; i++) {
116 if (size < order_to_size(orders[i]))
118 if (max_order < orders[i])
121 page = alloc_buffer_page(heap, buffer, orders[i]);
126 info->order = orders[i];
127 INIT_LIST_HEAD(&info->list);
135 static int ion_system_heap_allocate(struct ion_heap *heap,
136 struct ion_buffer *buffer,
137 unsigned long size, unsigned long align,
140 struct ion_system_heap *sys_heap = container_of(heap,
141 struct ion_system_heap,
143 struct sg_table *table;
144 struct scatterlist *sg;
146 struct list_head pages;
147 struct page_info *info, *tmp_info;
149 unsigned long size_remaining = PAGE_ALIGN(size);
150 unsigned int max_order = orders[0];
152 if (align > PAGE_SIZE)
155 if (size / PAGE_SIZE > totalram_pages / 2)
158 INIT_LIST_HEAD(&pages);
159 while (size_remaining > 0) {
160 info = alloc_largest_available(sys_heap, buffer, size_remaining,
164 list_add_tail(&info->list, &pages);
165 size_remaining -= (1 << info->order) * PAGE_SIZE;
166 max_order = info->order;
169 table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
173 ret = sg_alloc_table(table, i, GFP_KERNEL);
178 list_for_each_entry_safe(info, tmp_info, &pages, list) {
179 struct page *page = info->page;
180 sg_set_page(sg, page, (1 << info->order) * PAGE_SIZE, 0);
182 list_del(&info->list);
186 buffer->priv_virt = table;
191 list_for_each_entry_safe(info, tmp_info, &pages, list) {
192 free_buffer_page(sys_heap, buffer, info->page, info->order);
198 static void ion_system_heap_free(struct ion_buffer *buffer)
200 struct ion_heap *heap = buffer->heap;
201 struct ion_system_heap *sys_heap = container_of(heap,
202 struct ion_system_heap,
204 struct sg_table *table = buffer->sg_table;
205 bool cached = ion_buffer_cached(buffer);
206 struct scatterlist *sg;
210 /* uncached pages come from the page pools, zero them before returning
211 for security purposes (other allocations are zerod at alloc time */
213 ion_heap_buffer_zero(buffer);
215 for_each_sg(table->sgl, sg, table->nents, i)
216 free_buffer_page(sys_heap, buffer, sg_page(sg),
217 get_order(sg->length));
218 sg_free_table(table);
222 static struct sg_table *ion_system_heap_map_dma(struct ion_heap *heap,
223 struct ion_buffer *buffer)
225 return buffer->priv_virt;
228 static void ion_system_heap_unmap_dma(struct ion_heap *heap,
229 struct ion_buffer *buffer)
234 static struct ion_heap_ops system_heap_ops = {
235 .allocate = ion_system_heap_allocate,
236 .free = ion_system_heap_free,
237 .map_dma = ion_system_heap_map_dma,
238 .unmap_dma = ion_system_heap_unmap_dma,
239 .map_kernel = ion_heap_map_kernel,
240 .unmap_kernel = ion_heap_unmap_kernel,
241 .map_user = ion_heap_map_user,
244 static unsigned long ion_system_heap_shrink_count(struct shrinker *shrinker,
245 struct shrink_control *sc)
247 struct ion_heap *heap = container_of(shrinker, struct ion_heap,
249 struct ion_system_heap *sys_heap = container_of(heap,
250 struct ion_system_heap,
255 /* total number of items is whatever the page pools are holding
256 plus whatever's in the freelist */
257 for (i = 0; i < num_orders; i++) {
258 struct ion_page_pool *pool = sys_heap->pools[i];
259 nr_total += ion_page_pool_shrink(pool, sc->gfp_mask, 0);
261 nr_total += ion_heap_freelist_size(heap) / PAGE_SIZE;
266 static unsigned long ion_system_heap_shrink_scan(struct shrinker *shrinker,
267 struct shrink_control *sc)
270 struct ion_heap *heap = container_of(shrinker, struct ion_heap,
272 struct ion_system_heap *sys_heap = container_of(heap,
273 struct ion_system_heap,
278 if (sc->nr_to_scan == 0)
281 /* shrink the free list first, no point in zeroing the memory if
282 we're just going to reclaim it */
283 nr_freed += ion_heap_freelist_drain(heap, sc->nr_to_scan * PAGE_SIZE) /
286 if (nr_freed >= sc->nr_to_scan)
289 for (i = 0; i < num_orders; i++) {
290 struct ion_page_pool *pool = sys_heap->pools[i];
292 nr_freed += ion_page_pool_shrink(pool, sc->gfp_mask,
294 if (nr_freed >= sc->nr_to_scan)
303 static int ion_system_heap_debug_show(struct ion_heap *heap, struct seq_file *s,
307 struct ion_system_heap *sys_heap = container_of(heap,
308 struct ion_system_heap,
311 for (i = 0; i < num_orders; i++) {
312 struct ion_page_pool *pool = sys_heap->pools[i];
313 seq_printf(s, "%d order %u highmem pages in pool = %lu total\n",
314 pool->high_count, pool->order,
315 (1 << pool->order) * PAGE_SIZE * pool->high_count);
316 seq_printf(s, "%d order %u lowmem pages in pool = %lu total\n",
317 pool->low_count, pool->order,
318 (1 << pool->order) * PAGE_SIZE * pool->low_count);
323 struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
325 struct ion_system_heap *heap;
328 heap = kzalloc(sizeof(struct ion_system_heap), GFP_KERNEL);
330 return ERR_PTR(-ENOMEM);
331 heap->heap.ops = &system_heap_ops;
332 heap->heap.type = ION_HEAP_TYPE_SYSTEM;
333 heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
334 heap->pools = kzalloc(sizeof(struct ion_page_pool *) * num_orders,
337 goto err_alloc_pools;
338 for (i = 0; i < num_orders; i++) {
339 struct ion_page_pool *pool;
340 gfp_t gfp_flags = low_order_gfp_flags;
343 gfp_flags = high_order_gfp_flags;
344 pool = ion_page_pool_create(gfp_flags, orders[i]);
346 goto err_create_pool;
347 heap->pools[i] = pool;
350 heap->heap.shrinker.scan_objects = ion_system_heap_shrink_scan;
351 heap->heap.shrinker.count_objects = ion_system_heap_shrink_count;
352 heap->heap.shrinker.seeks = DEFAULT_SEEKS;
353 heap->heap.shrinker.batch = 0;
354 register_shrinker(&heap->heap.shrinker);
355 heap->heap.debug_show = ion_system_heap_debug_show;
358 for (i = 0; i < num_orders; i++)
360 ion_page_pool_destroy(heap->pools[i]);
364 return ERR_PTR(-ENOMEM);
367 void ion_system_heap_destroy(struct ion_heap *heap)
369 struct ion_system_heap *sys_heap = container_of(heap,
370 struct ion_system_heap,
374 for (i = 0; i < num_orders; i++)
375 ion_page_pool_destroy(sys_heap->pools[i]);
376 kfree(sys_heap->pools);
380 static int ion_system_contig_heap_allocate(struct ion_heap *heap,
381 struct ion_buffer *buffer,
386 int order = get_order(len);
388 struct sg_table *table;
392 if (align > (PAGE_SIZE << order))
395 page = alloc_pages(low_order_gfp_flags, order);
399 split_page(page, order);
401 len = PAGE_ALIGN(len);
402 for (i = len >> PAGE_SHIFT; i < (1 << order); i++)
403 __free_page(page + i);
405 table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
411 ret = sg_alloc_table(table, 1, GFP_KERNEL);
415 sg_set_page(table->sgl, page, len, 0);
417 buffer->priv_virt = table;
419 ion_pages_sync_for_device(NULL, page, len, DMA_BIDIRECTIONAL);
424 for (i = 0; i < len >> PAGE_SHIFT; i++)
425 __free_page(page + i);
430 static void ion_system_contig_heap_free(struct ion_buffer *buffer)
432 struct sg_table *table = buffer->priv_virt;
433 struct page *page = sg_page(table->sgl);
434 unsigned long pages = PAGE_ALIGN(buffer->size) >> PAGE_SHIFT;
437 for (i = 0; i < pages; i++)
438 __free_page(page + i);
439 sg_free_table(table);
443 static int ion_system_contig_heap_phys(struct ion_heap *heap,
444 struct ion_buffer *buffer,
445 ion_phys_addr_t *addr, size_t *len)
447 struct sg_table *table = buffer->priv_virt;
448 struct page *page = sg_page(table->sgl);
449 *addr = page_to_phys(page);
454 static struct sg_table *ion_system_contig_heap_map_dma(struct ion_heap *heap,
455 struct ion_buffer *buffer)
457 return buffer->priv_virt;
460 static void ion_system_contig_heap_unmap_dma(struct ion_heap *heap,
461 struct ion_buffer *buffer)
465 static struct ion_heap_ops kmalloc_ops = {
466 .allocate = ion_system_contig_heap_allocate,
467 .free = ion_system_contig_heap_free,
468 .phys = ion_system_contig_heap_phys,
469 .map_dma = ion_system_contig_heap_map_dma,
470 .unmap_dma = ion_system_contig_heap_unmap_dma,
471 .map_kernel = ion_heap_map_kernel,
472 .unmap_kernel = ion_heap_unmap_kernel,
473 .map_user = ion_heap_map_user,
476 struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *unused)
478 struct ion_heap *heap;
480 heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL);
482 return ERR_PTR(-ENOMEM);
483 heap->ops = &kmalloc_ops;
484 heap->type = ION_HEAP_TYPE_SYSTEM_CONTIG;
488 void ion_system_contig_heap_destroy(struct ion_heap *heap)