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];
134 static int ion_system_heap_allocate(struct ion_heap *heap,
135 struct ion_buffer *buffer,
136 unsigned long size, unsigned long align,
139 struct ion_system_heap *sys_heap = container_of(heap,
140 struct ion_system_heap,
142 struct sg_table *table;
143 struct scatterlist *sg;
145 struct list_head pages;
146 struct page_info *info, *tmp_info;
148 long size_remaining = PAGE_ALIGN(size);
149 unsigned int max_order = orders[0];
151 if (align > PAGE_SIZE)
154 INIT_LIST_HEAD(&pages);
155 while (size_remaining > 0) {
156 info = alloc_largest_available(sys_heap, buffer, size_remaining,
160 list_add_tail(&info->list, &pages);
161 size_remaining -= (1 << info->order) * PAGE_SIZE;
162 max_order = info->order;
165 table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
169 ret = sg_alloc_table(table, i, GFP_KERNEL);
174 list_for_each_entry_safe(info, tmp_info, &pages, list) {
175 struct page *page = info->page;
176 sg_set_page(sg, page, (1 << info->order) * PAGE_SIZE, 0);
178 list_del(&info->list);
182 buffer->priv_virt = table;
187 list_for_each_entry_safe(info, tmp_info, &pages, list) {
188 free_buffer_page(sys_heap, buffer, info->page, info->order);
194 static void ion_system_heap_free(struct ion_buffer *buffer)
196 struct ion_heap *heap = buffer->heap;
197 struct ion_system_heap *sys_heap = container_of(heap,
198 struct ion_system_heap,
200 struct sg_table *table = buffer->sg_table;
201 bool cached = ion_buffer_cached(buffer);
202 struct scatterlist *sg;
206 /* uncached pages come from the page pools, zero them before returning
207 for security purposes (other allocations are zerod at alloc time */
209 ion_heap_buffer_zero(buffer);
211 for_each_sg(table->sgl, sg, table->nents, i)
212 free_buffer_page(sys_heap, buffer, sg_page(sg),
213 get_order(sg->length));
214 sg_free_table(table);
218 static struct sg_table *ion_system_heap_map_dma(struct ion_heap *heap,
219 struct ion_buffer *buffer)
221 return buffer->priv_virt;
224 static void ion_system_heap_unmap_dma(struct ion_heap *heap,
225 struct ion_buffer *buffer)
230 static struct ion_heap_ops system_heap_ops = {
231 .allocate = ion_system_heap_allocate,
232 .free = ion_system_heap_free,
233 .map_dma = ion_system_heap_map_dma,
234 .unmap_dma = ion_system_heap_unmap_dma,
235 .map_kernel = ion_heap_map_kernel,
236 .unmap_kernel = ion_heap_unmap_kernel,
237 .map_user = ion_heap_map_user,
240 static unsigned long ion_system_heap_shrink_count(struct shrinker *shrinker,
241 struct shrink_control *sc)
243 struct ion_heap *heap = container_of(shrinker, struct ion_heap,
245 struct ion_system_heap *sys_heap = container_of(heap,
246 struct ion_system_heap,
251 /* total number of items is whatever the page pools are holding
252 plus whatever's in the freelist */
253 for (i = 0; i < num_orders; i++) {
254 struct ion_page_pool *pool = sys_heap->pools[i];
255 nr_total += ion_page_pool_shrink(pool, sc->gfp_mask, 0);
257 nr_total += ion_heap_freelist_size(heap) / PAGE_SIZE;
262 static unsigned long ion_system_heap_shrink_scan(struct shrinker *shrinker,
263 struct shrink_control *sc)
266 struct ion_heap *heap = container_of(shrinker, struct ion_heap,
268 struct ion_system_heap *sys_heap = container_of(heap,
269 struct ion_system_heap,
274 if (sc->nr_to_scan == 0)
277 /* shrink the free list first, no point in zeroing the memory if
278 we're just going to reclaim it */
279 nr_freed += ion_heap_freelist_drain(heap, sc->nr_to_scan * PAGE_SIZE) /
282 if (nr_freed >= sc->nr_to_scan)
285 for (i = 0; i < num_orders; i++) {
286 struct ion_page_pool *pool = sys_heap->pools[i];
288 nr_freed += ion_page_pool_shrink(pool, sc->gfp_mask,
290 if (nr_freed >= sc->nr_to_scan)
299 static int ion_system_heap_debug_show(struct ion_heap *heap, struct seq_file *s,
303 struct ion_system_heap *sys_heap = container_of(heap,
304 struct ion_system_heap,
307 for (i = 0; i < num_orders; i++) {
308 struct ion_page_pool *pool = sys_heap->pools[i];
309 seq_printf(s, "%d order %u highmem pages in pool = %lu total\n",
310 pool->high_count, pool->order,
311 (1 << pool->order) * PAGE_SIZE * pool->high_count);
312 seq_printf(s, "%d order %u lowmem pages in pool = %lu total\n",
313 pool->low_count, pool->order,
314 (1 << pool->order) * PAGE_SIZE * pool->low_count);
319 struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
321 struct ion_system_heap *heap;
324 heap = kzalloc(sizeof(struct ion_system_heap), GFP_KERNEL);
326 return ERR_PTR(-ENOMEM);
327 heap->heap.ops = &system_heap_ops;
328 heap->heap.type = ION_HEAP_TYPE_SYSTEM;
329 heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
330 heap->pools = kzalloc(sizeof(struct ion_page_pool *) * num_orders,
333 goto err_alloc_pools;
334 for (i = 0; i < num_orders; i++) {
335 struct ion_page_pool *pool;
336 gfp_t gfp_flags = low_order_gfp_flags;
339 gfp_flags = high_order_gfp_flags;
340 pool = ion_page_pool_create(gfp_flags, orders[i]);
342 goto err_create_pool;
343 heap->pools[i] = pool;
346 heap->heap.shrinker.scan_objects = ion_system_heap_shrink_scan;
347 heap->heap.shrinker.count_objects = ion_system_heap_shrink_count;
348 heap->heap.shrinker.seeks = DEFAULT_SEEKS;
349 heap->heap.shrinker.batch = 0;
350 register_shrinker(&heap->heap.shrinker);
351 heap->heap.debug_show = ion_system_heap_debug_show;
354 for (i = 0; i < num_orders; i++)
356 ion_page_pool_destroy(heap->pools[i]);
360 return ERR_PTR(-ENOMEM);
363 void ion_system_heap_destroy(struct ion_heap *heap)
365 struct ion_system_heap *sys_heap = container_of(heap,
366 struct ion_system_heap,
370 for (i = 0; i < num_orders; i++)
371 ion_page_pool_destroy(sys_heap->pools[i]);
372 kfree(sys_heap->pools);
376 static int ion_system_contig_heap_allocate(struct ion_heap *heap,
377 struct ion_buffer *buffer,
382 int order = get_order(len);
384 struct sg_table *table;
388 if (align > (PAGE_SIZE << order))
391 page = alloc_pages(low_order_gfp_flags, order);
395 split_page(page, order);
397 len = PAGE_ALIGN(len);
398 for (i = len >> PAGE_SHIFT; i < (1 << order); i++)
399 __free_page(page + i);
401 table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
407 ret = sg_alloc_table(table, 1, GFP_KERNEL);
411 sg_set_page(table->sgl, page, len, 0);
413 buffer->priv_virt = table;
415 ion_pages_sync_for_device(NULL, page, len, DMA_BIDIRECTIONAL);
420 for (i = 0; i < len >> PAGE_SHIFT; i++)
421 __free_page(page + i);
426 static void ion_system_contig_heap_free(struct ion_buffer *buffer)
428 struct sg_table *table = buffer->priv_virt;
429 struct page *page = sg_page(table->sgl);
430 unsigned long pages = PAGE_ALIGN(buffer->size) >> PAGE_SHIFT;
433 for (i = 0; i < pages; i++)
434 __free_page(page + i);
435 sg_free_table(table);
439 static int ion_system_contig_heap_phys(struct ion_heap *heap,
440 struct ion_buffer *buffer,
441 ion_phys_addr_t *addr, size_t *len)
443 struct sg_table *table = buffer->priv_virt;
444 struct page *page = sg_page(table->sgl);
445 *addr = page_to_phys(page);
450 static struct sg_table *ion_system_contig_heap_map_dma(struct ion_heap *heap,
451 struct ion_buffer *buffer)
453 return buffer->priv_virt;
456 static void ion_system_contig_heap_unmap_dma(struct ion_heap *heap,
457 struct ion_buffer *buffer)
461 static struct ion_heap_ops kmalloc_ops = {
462 .allocate = ion_system_contig_heap_allocate,
463 .free = ion_system_contig_heap_free,
464 .phys = ion_system_contig_heap_phys,
465 .map_dma = ion_system_contig_heap_map_dma,
466 .unmap_dma = ion_system_contig_heap_unmap_dma,
467 .map_kernel = ion_heap_map_kernel,
468 .unmap_kernel = ion_heap_unmap_kernel,
469 .map_user = ion_heap_map_user,
472 struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *unused)
474 struct ion_heap *heap;
476 heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL);
478 return ERR_PTR(-ENOMEM);
479 heap->ops = &kmalloc_ops;
480 heap->type = ION_HEAP_TYPE_SYSTEM_CONTIG;
484 void ion_system_contig_heap_destroy(struct ion_heap *heap)