| /* |
| * drivers/staging/android/ion/ion_system_heap.c |
| * |
| * Copyright (C) 2011 Google, Inc. |
| * |
| * This software is licensed under the terms of the GNU General Public |
| * License version 2, as published by the Free Software Foundation, and |
| * may be copied, distributed, and modified under those terms. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| #include <asm/page.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/err.h> |
| #include <linux/highmem.h> |
| #include <linux/mm.h> |
| #include <linux/scatterlist.h> |
| #include <linux/seq_file.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| #include "ion.h" |
| #include "ion_priv.h" |
| |
| static gfp_t high_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN | |
| __GFP_NORETRY) & ~__GFP_WAIT; |
| static gfp_t low_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN); |
| static const unsigned int orders[] = {8, 4, 0}; |
| static const int num_orders = ARRAY_SIZE(orders); |
| static int order_to_index(unsigned int order) |
| { |
| int i; |
| |
| for (i = 0; i < num_orders; i++) |
| if (order == orders[i]) |
| return i; |
| BUG(); |
| return -1; |
| } |
| |
| static inline unsigned int order_to_size(int order) |
| { |
| return PAGE_SIZE << order; |
| } |
| |
| struct ion_system_heap { |
| struct ion_heap heap; |
| struct ion_page_pool *pools[0]; |
| }; |
| |
| static struct page *alloc_buffer_page(struct ion_system_heap *heap, |
| struct ion_buffer *buffer, |
| unsigned long order) |
| { |
| bool cached = ion_buffer_cached(buffer); |
| struct ion_page_pool *pool = heap->pools[order_to_index(order)]; |
| struct page *page; |
| |
| if (!cached) { |
| page = ion_page_pool_alloc(pool); |
| } else { |
| gfp_t gfp_flags = low_order_gfp_flags; |
| |
| if (order > 4) |
| gfp_flags = high_order_gfp_flags; |
| page = alloc_pages(gfp_flags | __GFP_COMP, order); |
| if (!page) |
| return NULL; |
| ion_pages_sync_for_device(NULL, page, PAGE_SIZE << order, |
| DMA_BIDIRECTIONAL); |
| } |
| |
| return page; |
| } |
| |
| static void free_buffer_page(struct ion_system_heap *heap, |
| struct ion_buffer *buffer, struct page *page) |
| { |
| unsigned int order = compound_order(page); |
| bool cached = ion_buffer_cached(buffer); |
| |
| if (!cached && !(buffer->private_flags & ION_PRIV_FLAG_SHRINKER_FREE)) { |
| struct ion_page_pool *pool = heap->pools[order_to_index(order)]; |
| |
| ion_page_pool_free(pool, page); |
| } else { |
| __free_pages(page, order); |
| } |
| } |
| |
| |
| static struct page *alloc_largest_available(struct ion_system_heap *heap, |
| struct ion_buffer *buffer, |
| unsigned long size, |
| unsigned int max_order) |
| { |
| struct page *page; |
| int i; |
| |
| for (i = 0; i < num_orders; i++) { |
| if (size < order_to_size(orders[i])) |
| continue; |
| if (max_order < orders[i]) |
| continue; |
| |
| page = alloc_buffer_page(heap, buffer, orders[i]); |
| if (!page) |
| continue; |
| |
| return page; |
| } |
| |
| return NULL; |
| } |
| |
| static int ion_system_heap_allocate(struct ion_heap *heap, |
| struct ion_buffer *buffer, |
| unsigned long size, unsigned long align, |
| unsigned long flags) |
| { |
| struct ion_system_heap *sys_heap = container_of(heap, |
| struct ion_system_heap, |
| heap); |
| struct sg_table *table; |
| struct scatterlist *sg; |
| struct list_head pages; |
| struct page *page, *tmp_page; |
| int i = 0; |
| unsigned long size_remaining = PAGE_ALIGN(size); |
| unsigned int max_order = orders[0]; |
| |
| if (align > PAGE_SIZE) |
| return -EINVAL; |
| |
| if (size / PAGE_SIZE > totalram_pages / 2) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&pages); |
| while (size_remaining > 0) { |
| page = alloc_largest_available(sys_heap, buffer, size_remaining, |
| max_order); |
| if (!page) |
| goto free_pages; |
| list_add_tail(&page->lru, &pages); |
| size_remaining -= PAGE_SIZE << compound_order(page); |
| max_order = compound_order(page); |
| i++; |
| } |
| table = kmalloc(sizeof(struct sg_table), GFP_KERNEL); |
| if (!table) |
| goto free_pages; |
| |
| if (sg_alloc_table(table, i, GFP_KERNEL)) |
| goto free_table; |
| |
| sg = table->sgl; |
| list_for_each_entry_safe(page, tmp_page, &pages, lru) { |
| sg_set_page(sg, page, PAGE_SIZE << compound_order(page), 0); |
| sg = sg_next(sg); |
| list_del(&page->lru); |
| } |
| |
| buffer->priv_virt = table; |
| return 0; |
| |
| free_table: |
| kfree(table); |
| free_pages: |
| list_for_each_entry_safe(page, tmp_page, &pages, lru) |
| free_buffer_page(sys_heap, buffer, page); |
| return -ENOMEM; |
| } |
| |
| static void ion_system_heap_free(struct ion_buffer *buffer) |
| { |
| struct ion_system_heap *sys_heap = container_of(buffer->heap, |
| struct ion_system_heap, |
| heap); |
| struct sg_table *table = buffer->sg_table; |
| bool cached = ion_buffer_cached(buffer); |
| struct scatterlist *sg; |
| int i; |
| |
| /* uncached pages come from the page pools, zero them before returning |
| for security purposes (other allocations are zerod at alloc time */ |
| if (!cached && !(buffer->private_flags & ION_PRIV_FLAG_SHRINKER_FREE)) |
| ion_heap_buffer_zero(buffer); |
| |
| for_each_sg(table->sgl, sg, table->nents, i) |
| free_buffer_page(sys_heap, buffer, sg_page(sg)); |
| sg_free_table(table); |
| kfree(table); |
| } |
| |
| static struct sg_table *ion_system_heap_map_dma(struct ion_heap *heap, |
| struct ion_buffer *buffer) |
| { |
| return buffer->priv_virt; |
| } |
| |
| static void ion_system_heap_unmap_dma(struct ion_heap *heap, |
| struct ion_buffer *buffer) |
| { |
| } |
| |
| static int ion_system_heap_shrink(struct ion_heap *heap, gfp_t gfp_mask, |
| int nr_to_scan) |
| { |
| struct ion_system_heap *sys_heap; |
| int nr_total = 0; |
| int i; |
| |
| sys_heap = container_of(heap, struct ion_system_heap, heap); |
| |
| for (i = 0; i < num_orders; i++) { |
| struct ion_page_pool *pool = sys_heap->pools[i]; |
| |
| nr_total += ion_page_pool_shrink(pool, gfp_mask, nr_to_scan); |
| } |
| |
| return nr_total; |
| } |
| |
| static struct ion_heap_ops system_heap_ops = { |
| .allocate = ion_system_heap_allocate, |
| .free = ion_system_heap_free, |
| .map_dma = ion_system_heap_map_dma, |
| .unmap_dma = ion_system_heap_unmap_dma, |
| .map_kernel = ion_heap_map_kernel, |
| .unmap_kernel = ion_heap_unmap_kernel, |
| .map_user = ion_heap_map_user, |
| .shrink = ion_system_heap_shrink, |
| }; |
| |
| static int ion_system_heap_debug_show(struct ion_heap *heap, struct seq_file *s, |
| void *unused) |
| { |
| |
| struct ion_system_heap *sys_heap = container_of(heap, |
| struct ion_system_heap, |
| heap); |
| int i; |
| |
| for (i = 0; i < num_orders; i++) { |
| struct ion_page_pool *pool = sys_heap->pools[i]; |
| |
| seq_printf(s, "%d order %u highmem pages in pool = %lu total\n", |
| pool->high_count, pool->order, |
| (PAGE_SIZE << pool->order) * pool->high_count); |
| seq_printf(s, "%d order %u lowmem pages in pool = %lu total\n", |
| pool->low_count, pool->order, |
| (PAGE_SIZE << pool->order) * pool->low_count); |
| } |
| return 0; |
| } |
| |
| struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused) |
| { |
| struct ion_system_heap *heap; |
| int i; |
| |
| heap = kzalloc(sizeof(struct ion_system_heap) + |
| sizeof(struct ion_page_pool *) * num_orders, |
| GFP_KERNEL); |
| if (!heap) |
| return ERR_PTR(-ENOMEM); |
| heap->heap.ops = &system_heap_ops; |
| heap->heap.type = ION_HEAP_TYPE_SYSTEM; |
| heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE; |
| |
| for (i = 0; i < num_orders; i++) { |
| struct ion_page_pool *pool; |
| gfp_t gfp_flags = low_order_gfp_flags; |
| |
| if (orders[i] > 4) |
| gfp_flags = high_order_gfp_flags; |
| pool = ion_page_pool_create(gfp_flags, orders[i]); |
| if (!pool) |
| goto destroy_pools; |
| heap->pools[i] = pool; |
| } |
| |
| heap->heap.debug_show = ion_system_heap_debug_show; |
| return &heap->heap; |
| |
| destroy_pools: |
| while (i--) |
| ion_page_pool_destroy(heap->pools[i]); |
| kfree(heap); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| void ion_system_heap_destroy(struct ion_heap *heap) |
| { |
| struct ion_system_heap *sys_heap = container_of(heap, |
| struct ion_system_heap, |
| heap); |
| int i; |
| |
| for (i = 0; i < num_orders; i++) |
| ion_page_pool_destroy(sys_heap->pools[i]); |
| kfree(sys_heap); |
| } |
| |
| static int ion_system_contig_heap_allocate(struct ion_heap *heap, |
| struct ion_buffer *buffer, |
| unsigned long len, |
| unsigned long align, |
| unsigned long flags) |
| { |
| int order = get_order(len); |
| struct page *page; |
| struct sg_table *table; |
| unsigned long i; |
| int ret; |
| |
| if (align > (PAGE_SIZE << order)) |
| return -EINVAL; |
| |
| page = alloc_pages(low_order_gfp_flags, order); |
| if (!page) |
| return -ENOMEM; |
| |
| split_page(page, order); |
| |
| len = PAGE_ALIGN(len); |
| for (i = len >> PAGE_SHIFT; i < (1 << order); i++) |
| __free_page(page + i); |
| |
| table = kmalloc(sizeof(struct sg_table), GFP_KERNEL); |
| if (!table) { |
| ret = -ENOMEM; |
| goto free_pages; |
| } |
| |
| ret = sg_alloc_table(table, 1, GFP_KERNEL); |
| if (ret) |
| goto free_table; |
| |
| sg_set_page(table->sgl, page, len, 0); |
| |
| buffer->priv_virt = table; |
| |
| ion_pages_sync_for_device(NULL, page, len, DMA_BIDIRECTIONAL); |
| |
| return 0; |
| |
| free_table: |
| kfree(table); |
| free_pages: |
| for (i = 0; i < len >> PAGE_SHIFT; i++) |
| __free_page(page + i); |
| |
| return ret; |
| } |
| |
| static void ion_system_contig_heap_free(struct ion_buffer *buffer) |
| { |
| struct sg_table *table = buffer->priv_virt; |
| struct page *page = sg_page(table->sgl); |
| unsigned long pages = PAGE_ALIGN(buffer->size) >> PAGE_SHIFT; |
| unsigned long i; |
| |
| for (i = 0; i < pages; i++) |
| __free_page(page + i); |
| sg_free_table(table); |
| kfree(table); |
| } |
| |
| static int ion_system_contig_heap_phys(struct ion_heap *heap, |
| struct ion_buffer *buffer, |
| ion_phys_addr_t *addr, size_t *len) |
| { |
| struct sg_table *table = buffer->priv_virt; |
| struct page *page = sg_page(table->sgl); |
| *addr = page_to_phys(page); |
| *len = buffer->size; |
| return 0; |
| } |
| |
| static struct sg_table *ion_system_contig_heap_map_dma(struct ion_heap *heap, |
| struct ion_buffer *buffer) |
| { |
| return buffer->priv_virt; |
| } |
| |
| static void ion_system_contig_heap_unmap_dma(struct ion_heap *heap, |
| struct ion_buffer *buffer) |
| { |
| } |
| |
| static struct ion_heap_ops kmalloc_ops = { |
| .allocate = ion_system_contig_heap_allocate, |
| .free = ion_system_contig_heap_free, |
| .phys = ion_system_contig_heap_phys, |
| .map_dma = ion_system_contig_heap_map_dma, |
| .unmap_dma = ion_system_contig_heap_unmap_dma, |
| .map_kernel = ion_heap_map_kernel, |
| .unmap_kernel = ion_heap_unmap_kernel, |
| .map_user = ion_heap_map_user, |
| }; |
| |
| struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *unused) |
| { |
| struct ion_heap *heap; |
| |
| heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL); |
| if (!heap) |
| return ERR_PTR(-ENOMEM); |
| heap->ops = &kmalloc_ops; |
| heap->type = ION_HEAP_TYPE_SYSTEM_CONTIG; |
| return heap; |
| } |
| |
| void ion_system_contig_heap_destroy(struct ion_heap *heap) |
| { |
| kfree(heap); |
| } |