ion_carveout_heap.c revision caaf3f12970057b32176eb333a1bfc3c6f67cbdd 
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 sg_table *ion_carveout_heap_map_dma(struct ion_heap *heap,
88					      struct ion_buffer *buffer)
89{
90	struct sg_table *table;
91	int ret;
92
93	table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
94	if (!table)
95		return ERR_PTR(-ENOMEM);
96	ret = sg_alloc_table(table, 1, GFP_KERNEL);
97	if (ret) {
98		kfree(table);
99		return ERR_PTR(ret);
100	}
101	sg_set_page(table->sgl, phys_to_page(buffer->priv_phys), buffer->size,
102		    0);
103	return table;
104}
105
106void ion_carveout_heap_unmap_dma(struct ion_heap *heap,
107				 struct ion_buffer *buffer)
108{
109	sg_free_table(buffer->sg_table);
110}
111
112void *ion_carveout_heap_map_kernel(struct ion_heap *heap,
113				   struct ion_buffer *buffer)
114{
115	int mtype = MT_MEMORY_NONCACHED;
116
117	if (buffer->flags & ION_FLAG_CACHED)
118		mtype = MT_MEMORY;
119
120	return __arm_ioremap(buffer->priv_phys, buffer->size,
121			      mtype);
122}
123
124void ion_carveout_heap_unmap_kernel(struct ion_heap *heap,
125				    struct ion_buffer *buffer)
126{
127	__arm_iounmap(buffer->vaddr);
128	buffer->vaddr = NULL;
129	return;
130}
131
132int ion_carveout_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
133			       struct vm_area_struct *vma)
134{
135	return remap_pfn_range(vma, vma->vm_start,
136			       __phys_to_pfn(buffer->priv_phys) + vma->vm_pgoff,
137			       vma->vm_end - vma->vm_start,
138			       pgprot_noncached(vma->vm_page_prot));
139}
140
141static struct ion_heap_ops carveout_heap_ops = {
142	.allocate = ion_carveout_heap_allocate,
143	.free = ion_carveout_heap_free,
144	.phys = ion_carveout_heap_phys,
145	.map_dma = ion_carveout_heap_map_dma,
146	.unmap_dma = ion_carveout_heap_unmap_dma,
147	.map_user = ion_carveout_heap_map_user,
148	.map_kernel = ion_carveout_heap_map_kernel,
149	.unmap_kernel = ion_carveout_heap_unmap_kernel,
150};
151
152struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data)
153{
154	struct ion_carveout_heap *carveout_heap;
155
156	carveout_heap = kzalloc(sizeof(struct ion_carveout_heap), GFP_KERNEL);
157	if (!carveout_heap)
158		return ERR_PTR(-ENOMEM);
159
160	carveout_heap->pool = gen_pool_create(12, -1);
161	if (!carveout_heap->pool) {
162		kfree(carveout_heap);
163		return ERR_PTR(-ENOMEM);
164	}
165	carveout_heap->base = heap_data->base;
166	gen_pool_add(carveout_heap->pool, carveout_heap->base, heap_data->size,
167		     -1);
168	carveout_heap->heap.ops = &carveout_heap_ops;
169	carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
170
171	return &carveout_heap->heap;
172}
173
174void ion_carveout_heap_destroy(struct ion_heap *heap)
175{
176	struct ion_carveout_heap *carveout_heap =
177	     container_of(heap, struct  ion_carveout_heap, heap);
178
179	gen_pool_destroy(carveout_heap->pool);
180	kfree(carveout_heap);
181	carveout_heap = NULL;
182}
183