ion_carveout_heap.c revision 0f3cbb59ec47f313e138913c89a1dd0048561355 
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
28#include <asm/mach/map.h>
29
30struct ion_carveout_heap {
31	struct ion_heap heap;
32	struct gen_pool *pool;
33	ion_phys_addr_t base;
34};
35
36ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
37				      unsigned long size,
38				      unsigned long align)
39{
40	struct ion_carveout_heap *carveout_heap =
41		container_of(heap, struct ion_carveout_heap, heap);
42	unsigned long offset = gen_pool_alloc(carveout_heap->pool, size);
43
44	if (!offset)
45		return ION_CARVEOUT_ALLOCATE_FAIL;
46
47	return offset;
48}
49
50void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
51		       unsigned long size)
52{
53	struct ion_carveout_heap *carveout_heap =
54		container_of(heap, struct ion_carveout_heap, heap);
55
56	if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
57		return;
58	gen_pool_free(carveout_heap->pool, addr, size);
59}
60
61static int ion_carveout_heap_phys(struct ion_heap *heap,
62				  struct ion_buffer *buffer,
63				  ion_phys_addr_t *addr, size_t *len)
64{
65	*addr = buffer->priv_phys;
66	*len = buffer->size;
67	return 0;
68}
69
70static int ion_carveout_heap_allocate(struct ion_heap *heap,
71				      struct ion_buffer *buffer,
72				      unsigned long size, unsigned long align,
73				      unsigned long flags)
74{
75	buffer->priv_phys = ion_carveout_allocate(heap, size, align);
76	return buffer->priv_phys == ION_CARVEOUT_ALLOCATE_FAIL ? -ENOMEM : 0;
77}
78
79static void ion_carveout_heap_free(struct ion_buffer *buffer)
80{
81	struct ion_heap *heap = buffer->heap;
82
83	ion_carveout_free(heap, buffer->priv_phys, buffer->size);
84	buffer->priv_phys = ION_CARVEOUT_ALLOCATE_FAIL;
85}
86
87struct scatterlist *ion_carveout_heap_map_dma(struct ion_heap *heap,
88					      struct ion_buffer *buffer)
89{
90	return ERR_PTR(-EINVAL);
91}
92
93void ion_carveout_heap_unmap_dma(struct ion_heap *heap,
94				 struct ion_buffer *buffer)
95{
96	return;
97}
98
99void *ion_carveout_heap_map_kernel(struct ion_heap *heap,
100				   struct ion_buffer *buffer)
101{
102	return __arm_ioremap(buffer->priv_phys, buffer->size,
103			      MT_MEMORY_NONCACHED);
104}
105
106void ion_carveout_heap_unmap_kernel(struct ion_heap *heap,
107				    struct ion_buffer *buffer)
108{
109	__arm_iounmap(buffer->vaddr);
110	buffer->vaddr = NULL;
111	return;
112}
113
114int ion_carveout_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
115			       struct vm_area_struct *vma)
116{
117	return remap_pfn_range(vma, vma->vm_start,
118			       __phys_to_pfn(buffer->priv_phys) + vma->vm_pgoff,
119			       buffer->size,
120			       pgprot_noncached(vma->vm_page_prot));
121}
122
123static struct ion_heap_ops carveout_heap_ops = {
124	.allocate = ion_carveout_heap_allocate,
125	.free = ion_carveout_heap_free,
126	.phys = ion_carveout_heap_phys,
127	.map_user = ion_carveout_heap_map_user,
128	.map_kernel = ion_carveout_heap_map_kernel,
129	.unmap_kernel = ion_carveout_heap_unmap_kernel,
130};
131
132struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data)
133{
134	struct ion_carveout_heap *carveout_heap;
135
136	carveout_heap = kzalloc(sizeof(struct ion_carveout_heap), GFP_KERNEL);
137	if (!carveout_heap)
138		return ERR_PTR(-ENOMEM);
139
140	carveout_heap->pool = gen_pool_create(12, -1);
141	if (!carveout_heap->pool) {
142		kfree(carveout_heap);
143		return ERR_PTR(-ENOMEM);
144	}
145	carveout_heap->base = heap_data->base;
146	gen_pool_add(carveout_heap->pool, carveout_heap->base, heap_data->size,
147		     -1);
148	carveout_heap->heap.ops = &carveout_heap_ops;
149	carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
150
151	return &carveout_heap->heap;
152}
153
154void ion_carveout_heap_destroy(struct ion_heap *heap)
155{
156	struct ion_carveout_heap *carveout_heap =
157	     container_of(heap, struct  ion_carveout_heap, heap);
158
159	gen_pool_destroy(carveout_heap->pool);
160	kfree(carveout_heap);
161	carveout_heap = NULL;
162}
163