[mirror_ubuntu-zesty-kernel.git] / drivers / staging / android / ion / ion_chunk_heap.c

/*
 * drivers/staging/android/ion/ion_chunk_heap.c
 *
 * Copyright (C) 2012 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 <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/genalloc.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include "ion.h"
#include "ion_priv.h"

struct ion_chunk_heap {
	struct ion_heap heap;
	struct gen_pool *pool;
	ion_phys_addr_t base;
	unsigned long chunk_size;
	unsigned long size;
	unsigned long allocated;
};

static int ion_chunk_heap_allocate(struct ion_heap *heap,
				      struct ion_buffer *buffer,
				      unsigned long size, unsigned long align,
				      unsigned long flags)
{
	struct ion_chunk_heap *chunk_heap =
		container_of(heap, struct ion_chunk_heap, heap);
	struct sg_table *table;
	struct scatterlist *sg;
	int ret, i;
	unsigned long num_chunks;
	unsigned long allocated_size;

	if (align > chunk_heap->chunk_size)
		return -EINVAL;

	allocated_size = ALIGN(size, chunk_heap->chunk_size);
	num_chunks = allocated_size / chunk_heap->chunk_size;

	if (allocated_size > chunk_heap->size - chunk_heap->allocated)
		return -ENOMEM;

	table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
	if (!table)
		return -ENOMEM;
	ret = sg_alloc_table(table, num_chunks, GFP_KERNEL);
	if (ret) {
		kfree(table);
		return ret;
	}

	sg = table->sgl;
	for (i = 0; i < num_chunks; i++) {
		unsigned long paddr = gen_pool_alloc(chunk_heap->pool,
						     chunk_heap->chunk_size);
		if (!paddr)
			goto err;
		sg_set_page(sg, pfn_to_page(PFN_DOWN(paddr)),
				chunk_heap->chunk_size, 0);
		sg = sg_next(sg);
	}

	buffer->priv_virt = table;
	chunk_heap->allocated += allocated_size;
	return 0;
err:
	sg = table->sgl;
	for (i -= 1; i >= 0; i--) {
		gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
			      sg->length);
		sg = sg_next(sg);
	}
	sg_free_table(table);
	kfree(table);
	return -ENOMEM;
}

static void ion_chunk_heap_free(struct ion_buffer *buffer)
{
	struct ion_heap *heap = buffer->heap;
	struct ion_chunk_heap *chunk_heap =
		container_of(heap, struct ion_chunk_heap, heap);
	struct sg_table *table = buffer->priv_virt;
	struct scatterlist *sg;
	int i;
	unsigned long allocated_size;

	allocated_size = ALIGN(buffer->size, chunk_heap->chunk_size);

	ion_heap_buffer_zero(buffer);

	if (ion_buffer_cached(buffer))
		dma_sync_sg_for_device(NULL, table->sgl, table->nents,
							DMA_BIDIRECTIONAL);

	for_each_sg(table->sgl, sg, table->nents, i) {
		gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
			      sg->length);
	}
	chunk_heap->allocated -= allocated_size;
	sg_free_table(table);
	kfree(table);
}

static struct sg_table *ion_chunk_heap_map_dma(struct ion_heap *heap,
					       struct ion_buffer *buffer)
{
	return buffer->priv_virt;
}

static void ion_chunk_heap_unmap_dma(struct ion_heap *heap,
				     struct ion_buffer *buffer)
{
}

static struct ion_heap_ops chunk_heap_ops = {
	.allocate = ion_chunk_heap_allocate,
	.free = ion_chunk_heap_free,
	.map_dma = ion_chunk_heap_map_dma,
	.unmap_dma = ion_chunk_heap_unmap_dma,
	.map_user = ion_heap_map_user,
	.map_kernel = ion_heap_map_kernel,
	.unmap_kernel = ion_heap_unmap_kernel,
};

struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data)
{
	struct ion_chunk_heap *chunk_heap;
	int ret;
	struct page *page;
	size_t size;

	page = pfn_to_page(PFN_DOWN(heap_data->base));
	size = heap_data->size;

	ion_pages_sync_for_device(NULL, page, size, DMA_BIDIRECTIONAL);

	ret = ion_heap_pages_zero(page, size, pgprot_writecombine(PAGE_KERNEL));
	if (ret)
		return ERR_PTR(ret);

	chunk_heap = kzalloc(sizeof(struct ion_chunk_heap), GFP_KERNEL);
	if (!chunk_heap)
		return ERR_PTR(-ENOMEM);

	chunk_heap->chunk_size = (unsigned long)heap_data->priv;
	chunk_heap->pool = gen_pool_create(get_order(chunk_heap->chunk_size) +
					   PAGE_SHIFT, -1);
	if (!chunk_heap->pool) {
		ret = -ENOMEM;
		goto error_gen_pool_create;
	}
	chunk_heap->base = heap_data->base;
	chunk_heap->size = heap_data->size;
	chunk_heap->allocated = 0;

	gen_pool_add(chunk_heap->pool, chunk_heap->base, heap_data->size, -1);
	chunk_heap->heap.ops = &chunk_heap_ops;
	chunk_heap->heap.type = ION_HEAP_TYPE_CHUNK;
	chunk_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
	pr_debug("%s: base %lu size %zu align %ld\n", __func__,
		chunk_heap->base, heap_data->size, heap_data->align);

	return &chunk_heap->heap;

error_gen_pool_create:
	kfree(chunk_heap);
	return ERR_PTR(ret);
}

void ion_chunk_heap_destroy(struct ion_heap *heap)
{
	struct ion_chunk_heap *chunk_heap =
	     container_of(heap, struct  ion_chunk_heap, heap);

	gen_pool_destroy(chunk_heap->pool);
	kfree(chunk_heap);
	chunk_heap = NULL;
}
Commit	Line	Data
e3c2eb7c RSZ	1	/*
	2	* drivers/staging/android/ion/ion_chunk_heap.c
	3	*
	4	* Copyright (C) 2012 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	*/
e3c2eb7c RSZ	16	#include <linux/dma-mapping.h>
	17	#include <linux/err.h>
	18	#include <linux/genalloc.h>
	19	#include <linux/io.h>
	20	#include <linux/mm.h>
	21	#include <linux/scatterlist.h>
	22	#include <linux/slab.h>
	23	#include <linux/vmalloc.h>
	24	#include "ion.h"
	25	#include "ion_priv.h"
	26
e3c2eb7c RSZ	27	struct ion_chunk_heap {
	28	struct ion_heap heap;
	29	struct gen_pool *pool;
	30	ion_phys_addr_t base;
	31	unsigned long chunk_size;
	32	unsigned long size;
	33	unsigned long allocated;
	34	};
	35
	36	static int ion_chunk_heap_allocate(struct ion_heap *heap,
	37	struct ion_buffer *buffer,
	38	unsigned long size, unsigned long align,
	39	unsigned long flags)
	40	{
	41	struct ion_chunk_heap *chunk_heap =
	42	container_of(heap, struct ion_chunk_heap, heap);
	43	struct sg_table *table;
	44	struct scatterlist *sg;
	45	int ret, i;
	46	unsigned long num_chunks;
ea89faff	47	unsigned long allocated_size;
e3c2eb7c	48
dd608dd2 CC	49	if (align > chunk_heap->chunk_size)
	50	return -EINVAL;
	51
ea89faff CC	52	allocated_size = ALIGN(size, chunk_heap->chunk_size);
ea89faff CC	53	num_chunks = allocated_size / chunk_heap->chunk_size;
e3c2eb7c	54
ea89faff	55	if (allocated_size > chunk_heap->size - chunk_heap->allocated)
e3c2eb7c RSZ	56	return -ENOMEM;
e3c2eb7c RSZ	57
b6152016	58	table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
e3c2eb7c RSZ	59	if (!table)
	60	return -ENOMEM;
	61	ret = sg_alloc_table(table, num_chunks, GFP_KERNEL);
	62	if (ret) {
	63	kfree(table);
	64	return ret;
	65	}
	66
	67	sg = table->sgl;
	68	for (i = 0; i < num_chunks; i++) {
	69	unsigned long paddr = gen_pool_alloc(chunk_heap->pool,
	70	chunk_heap->chunk_size);
	71	if (!paddr)
	72	goto err;
1d804535 CC	73	sg_set_page(sg, pfn_to_page(PFN_DOWN(paddr)),
1d804535 CC	74	chunk_heap->chunk_size, 0);
e3c2eb7c RSZ	75	sg = sg_next(sg);
	76	}
	77
	78	buffer->priv_virt = table;
ea89faff	79	chunk_heap->allocated += allocated_size;
e3c2eb7c RSZ	80	return 0;
	81	err:
	82	sg = table->sgl;
	83	for (i -= 1; i >= 0; i--) {
3e6110fd	84	gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
06e0dcae	85	sg->length);
e3c2eb7c RSZ	86	sg = sg_next(sg);
	87	}
	88	sg_free_table(table);
	89	kfree(table);
	90	return -ENOMEM;
	91	}
	92
	93	static void ion_chunk_heap_free(struct ion_buffer *buffer)
	94	{
	95	struct ion_heap *heap = buffer->heap;
	96	struct ion_chunk_heap *chunk_heap =
	97	container_of(heap, struct ion_chunk_heap, heap);
	98	struct sg_table *table = buffer->priv_virt;
	99	struct scatterlist *sg;
	100	int i;
ea89faff CC	101	unsigned long allocated_size;
	102
	103	allocated_size = ALIGN(buffer->size, chunk_heap->chunk_size);
e3c2eb7c	104
0b6b2cde RSZ	105	ion_heap_buffer_zero(buffer);
0b6b2cde RSZ	106
e946b209 CC	107	if (ion_buffer_cached(buffer))
e946b209 CC	108	dma_sync_sg_for_device(NULL, table->sgl, table->nents,
69b2b20e	109	DMA_BIDIRECTIONAL);
e946b209	110
e3c2eb7c	111	for_each_sg(table->sgl, sg, table->nents, i) {
3e6110fd	112	gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
06e0dcae	113	sg->length);
e3c2eb7c	114	}
ea89faff	115	chunk_heap->allocated -= allocated_size;
e3c2eb7c RSZ	116	sg_free_table(table);
	117	kfree(table);
	118	}
	119
f63958d8 CC	120	static struct sg_table ion_chunk_heap_map_dma(struct ion_heap heap,
f63958d8 CC	121	struct ion_buffer *buffer)
e3c2eb7c RSZ	122	{
	123	return buffer->priv_virt;
	124	}
	125
f63958d8 CC	126	static void ion_chunk_heap_unmap_dma(struct ion_heap *heap,
f63958d8 CC	127	struct ion_buffer *buffer)
e3c2eb7c	128	{
e3c2eb7c RSZ	129	}
	130
	131	static struct ion_heap_ops chunk_heap_ops = {
	132	.allocate = ion_chunk_heap_allocate,
	133	.free = ion_chunk_heap_free,
	134	.map_dma = ion_chunk_heap_map_dma,
	135	.unmap_dma = ion_chunk_heap_unmap_dma,
	136	.map_user = ion_heap_map_user,
	137	.map_kernel = ion_heap_map_kernel,
	138	.unmap_kernel = ion_heap_unmap_kernel,
	139	};
	140
	141	struct ion_heap ion_chunk_heap_create(struct ion_platform_heap heap_data)
	142	{
	143	struct ion_chunk_heap *chunk_heap;
df6cf5c8 CC	144	int ret;
	145	struct page *page;
	146	size_t size;
	147
	148	page = pfn_to_page(PFN_DOWN(heap_data->base));
	149	size = heap_data->size;
	150
	151	ion_pages_sync_for_device(NULL, page, size, DMA_BIDIRECTIONAL);
	152
	153	ret = ion_heap_pages_zero(page, size, pgprot_writecombine(PAGE_KERNEL));
	154	if (ret)
	155	return ERR_PTR(ret);
57b5cd06	156
e3c2eb7c RSZ	157	chunk_heap = kzalloc(sizeof(struct ion_chunk_heap), GFP_KERNEL);
	158	if (!chunk_heap)
	159	return ERR_PTR(-ENOMEM);
	160
	161	chunk_heap->chunk_size = (unsigned long)heap_data->priv;
	162	chunk_heap->pool = gen_pool_create(get_order(chunk_heap->chunk_size) +
	163	PAGE_SHIFT, -1);
	164	if (!chunk_heap->pool) {
57b5cd06 RSZ	165	ret = -ENOMEM;
57b5cd06 RSZ	166	goto error_gen_pool_create;
e3c2eb7c RSZ	167	}
	168	chunk_heap->base = heap_data->base;
	169	chunk_heap->size = heap_data->size;
	170	chunk_heap->allocated = 0;
57b5cd06	171
e3c2eb7c RSZ	172	gen_pool_add(chunk_heap->pool, chunk_heap->base, heap_data->size, -1);
	173	chunk_heap->heap.ops = &chunk_heap_ops;
	174	chunk_heap->heap.type = ION_HEAP_TYPE_CHUNK;
fe2faea7	175	chunk_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
cef85381 GF	176	pr_debug("%s: base %lu size %zu align %ld\n", __func__,
cef85381 GF	177	chunk_heap->base, heap_data->size, heap_data->align);
e3c2eb7c RSZ	178
e3c2eb7c RSZ	179	return &chunk_heap->heap;
57b5cd06	180
57b5cd06 RSZ	181	error_gen_pool_create:
	182	kfree(chunk_heap);
	183	return ERR_PTR(ret);
e3c2eb7c RSZ	184	}
	185
	186	void ion_chunk_heap_destroy(struct ion_heap *heap)
	187	{
	188	struct ion_chunk_heap *chunk_heap =
	189	container_of(heap, struct ion_chunk_heap, heap);
	190
	191	gen_pool_destroy(chunk_heap->pool);
	192	kfree(chunk_heap);
	193	chunk_heap = NULL;
	194	}