[deliverable/linux.git] / drivers / staging / android / ion / ion_carveout_heap.c

/*
 * drivers/staging/android/ion/ion_carveout_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 <linux/spinlock.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_carveout_heap {
	struct ion_heap heap;
	struct gen_pool *pool;
	ion_phys_addr_t base;
};

ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
				      unsigned long size,
				      unsigned long align)
{
	struct ion_carveout_heap *carveout_heap =
		container_of(heap, struct ion_carveout_heap, heap);
	unsigned long offset = gen_pool_alloc(carveout_heap->pool, size);

	if (!offset)
		return ION_CARVEOUT_ALLOCATE_FAIL;

	return offset;
}

void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
		       unsigned long size)
{
	struct ion_carveout_heap *carveout_heap =
		container_of(heap, struct ion_carveout_heap, heap);

	if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
		return;
	gen_pool_free(carveout_heap->pool, addr, size);
}

static int ion_carveout_heap_phys(struct ion_heap *heap,
				  struct ion_buffer *buffer,
				  ion_phys_addr_t *addr, size_t *len)
{
	*addr = buffer->priv_phys;
	*len = buffer->size;
	return 0;
}

static int ion_carveout_heap_allocate(struct ion_heap *heap,
				      struct ion_buffer *buffer,
				      unsigned long size, unsigned long align,
				      unsigned long flags)
{
	buffer->priv_phys = ion_carveout_allocate(heap, size, align);
	return buffer->priv_phys == ION_CARVEOUT_ALLOCATE_FAIL ? -ENOMEM : 0;
}

static void ion_carveout_heap_free(struct ion_buffer *buffer)
{
	struct ion_heap *heap = buffer->heap;

	ion_carveout_free(heap, buffer->priv_phys, buffer->size);
	buffer->priv_phys = ION_CARVEOUT_ALLOCATE_FAIL;
}

struct sg_table *ion_carveout_heap_map_dma(struct ion_heap *heap,
					      struct ion_buffer *buffer)
{
	struct sg_table *table;
	int ret;

	table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
	if (!table)
		return ERR_PTR(-ENOMEM);
	ret = sg_alloc_table(table, 1, GFP_KERNEL);
	if (ret) {
		kfree(table);
		return ERR_PTR(ret);
	}
	sg_set_page(table->sgl, phys_to_page(buffer->priv_phys), buffer->size,
		    0);
	return table;
}

void ion_carveout_heap_unmap_dma(struct ion_heap *heap,
				 struct ion_buffer *buffer)
{
	sg_free_table(buffer->sg_table);
}

static struct ion_heap_ops carveout_heap_ops = {
	.allocate = ion_carveout_heap_allocate,
	.free = ion_carveout_heap_free,
	.phys = ion_carveout_heap_phys,
	.map_dma = ion_carveout_heap_map_dma,
	.unmap_dma = ion_carveout_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_carveout_heap_create(struct ion_platform_heap *heap_data)
{
	struct ion_carveout_heap *carveout_heap;

	carveout_heap = kzalloc(sizeof(struct ion_carveout_heap), GFP_KERNEL);
	if (!carveout_heap)
		return ERR_PTR(-ENOMEM);

	carveout_heap->pool = gen_pool_create(12, -1);
	if (!carveout_heap->pool) {
		kfree(carveout_heap);
		return ERR_PTR(-ENOMEM);
	}
	carveout_heap->base = heap_data->base;
	gen_pool_add(carveout_heap->pool, carveout_heap->base, heap_data->size,
		     -1);
	carveout_heap->heap.ops = &carveout_heap_ops;
	carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;

	return &carveout_heap->heap;
}

void ion_carveout_heap_destroy(struct ion_heap *heap)
{
	struct ion_carveout_heap *carveout_heap =
	     container_of(heap, struct  ion_carveout_heap, heap);

	gen_pool_destroy(carveout_heap->pool);
	kfree(carveout_heap);
	carveout_heap = NULL;
}
Commit	Line	Data
c30707be RSZ	1	/*
	2	* drivers/staging/android/ion/ion_carveout_heap.c
	3	*
	4	* Copyright (C) 2011 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	*/
	16	#include <linux/spinlock.h>
	17
	18	#include <linux/err.h>
	19	#include <linux/genalloc.h>
	20	#include <linux/io.h>
	21	#include <linux/mm.h>
	22	#include <linux/scatterlist.h>
	23	#include <linux/slab.h>
	24	#include <linux/vmalloc.h>
	25	#include "ion.h"
	26	#include "ion_priv.h"
	27
c30707be RSZ	28	struct ion_carveout_heap {
	29	struct ion_heap heap;
	30	struct gen_pool *pool;
	31	ion_phys_addr_t base;
	32	};
	33
	34	ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
	35	unsigned long size,
	36	unsigned long align)
	37	{
	38	struct ion_carveout_heap *carveout_heap =
	39	container_of(heap, struct ion_carveout_heap, heap);
	40	unsigned long offset = gen_pool_alloc(carveout_heap->pool, size);
	41
	42	if (!offset)
	43	return ION_CARVEOUT_ALLOCATE_FAIL;
	44
	45	return offset;
	46	}
	47
	48	void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
	49	unsigned long size)
	50	{
	51	struct ion_carveout_heap *carveout_heap =
	52	container_of(heap, struct ion_carveout_heap, heap);
	53
	54	if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
	55	return;
	56	gen_pool_free(carveout_heap->pool, addr, size);
	57	}
	58
	59	static int ion_carveout_heap_phys(struct ion_heap *heap,
	60	struct ion_buffer *buffer,
	61	ion_phys_addr_t addr, size_t len)
	62	{
	63	*addr = buffer->priv_phys;
	64	*len = buffer->size;
	65	return 0;
	66	}
	67
	68	static int ion_carveout_heap_allocate(struct ion_heap *heap,
	69	struct ion_buffer *buffer,
	70	unsigned long size, unsigned long align,
	71	unsigned long flags)
	72	{
	73	buffer->priv_phys = ion_carveout_allocate(heap, size, align);
	74	return buffer->priv_phys == ION_CARVEOUT_ALLOCATE_FAIL ? -ENOMEM : 0;
	75	}
	76
	77	static void ion_carveout_heap_free(struct ion_buffer *buffer)
	78	{
	79	struct ion_heap *heap = buffer->heap;
	80
	81	ion_carveout_free(heap, buffer->priv_phys, buffer->size);
	82	buffer->priv_phys = ION_CARVEOUT_ALLOCATE_FAIL;
	83	}
	84
56a7c185	85	struct sg_table ion_carveout_heap_map_dma(struct ion_heap heap,
c30707be RSZ	86	struct ion_buffer *buffer)
c30707be RSZ	87	{
56a7c185 RSZ	88	struct sg_table *table;
	89	int ret;
	90
	91	table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
	92	if (!table)
	93	return ERR_PTR(-ENOMEM);
	94	ret = sg_alloc_table(table, 1, GFP_KERNEL);
	95	if (ret) {
	96	kfree(table);
	97	return ERR_PTR(ret);
	98	}
	99	sg_set_page(table->sgl, phys_to_page(buffer->priv_phys), buffer->size,
	100	0);
	101	return table;
c30707be RSZ	102	}
	103
	104	void ion_carveout_heap_unmap_dma(struct ion_heap *heap,
	105	struct ion_buffer *buffer)
	106	{
56a7c185	107	sg_free_table(buffer->sg_table);
c30707be RSZ	108	}
c30707be RSZ	109
c30707be RSZ	110	static struct ion_heap_ops carveout_heap_ops = {
	111	.allocate = ion_carveout_heap_allocate,
	112	.free = ion_carveout_heap_free,
	113	.phys = ion_carveout_heap_phys,
caaf3f12 BG	114	.map_dma = ion_carveout_heap_map_dma,
caaf3f12 BG	115	.unmap_dma = ion_carveout_heap_unmap_dma,
8be3759a CC	116	.map_user = ion_heap_map_user,
	117	.map_kernel = ion_heap_map_kernel,
	118	.unmap_kernel = ion_heap_unmap_kernel,
c30707be RSZ	119	};
	120
	121	struct ion_heap ion_carveout_heap_create(struct ion_platform_heap heap_data)
	122	{
	123	struct ion_carveout_heap *carveout_heap;
	124
	125	carveout_heap = kzalloc(sizeof(struct ion_carveout_heap), GFP_KERNEL);
	126	if (!carveout_heap)
	127	return ERR_PTR(-ENOMEM);
	128
	129	carveout_heap->pool = gen_pool_create(12, -1);
	130	if (!carveout_heap->pool) {
	131	kfree(carveout_heap);
	132	return ERR_PTR(-ENOMEM);
	133	}
	134	carveout_heap->base = heap_data->base;
	135	gen_pool_add(carveout_heap->pool, carveout_heap->base, heap_data->size,
	136	-1);
	137	carveout_heap->heap.ops = &carveout_heap_ops;
	138	carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
	139
	140	return &carveout_heap->heap;
	141	}
	142
	143	void ion_carveout_heap_destroy(struct ion_heap *heap)
	144	{
	145	struct ion_carveout_heap *carveout_heap =
	146	container_of(heap, struct ion_carveout_heap, heap);
	147
	148	gen_pool_destroy(carveout_heap->pool);
	149	kfree(carveout_heap);
	150	carveout_heap = NULL;
	151	}