1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* drivers/gpu/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 <linux/err.h>
#include <linux/ion.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include "ion_priv.h"
static int ion_system_heap_allocate(struct ion_heap *heap,
struct ion_buffer *buffer,
unsigned long size, unsigned long align,
unsigned long flags)
{
buffer->priv_virt = vmalloc_user(size);
if (!buffer->priv_virt)
return -ENOMEM;
return 0;
}
void ion_system_heap_free(struct ion_buffer *buffer)
{
vfree(buffer->priv_virt);
}
struct scatterlist *ion_system_heap_map_dma(struct ion_heap *heap,
struct ion_buffer *buffer)
{
struct scatterlist *sglist;
struct page *page;
int i;
int npages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
void *vaddr = buffer->priv_virt;
sglist = vmalloc(npages * sizeof(struct scatterlist));
if (!sglist)
return ERR_PTR(-ENOMEM);
memset(sglist, 0, npages * sizeof(struct scatterlist));
sg_init_table(sglist, npages);
for (i = 0; i < npages; i++) {
page = vmalloc_to_page(vaddr);
if (!page)
goto end;
sg_set_page(&sglist[i], page, PAGE_SIZE, 0);
vaddr += PAGE_SIZE;
}
/* XXX do cache maintenance for dma? */
return sglist;
end:
vfree(sglist);
return NULL;
}
void ion_system_heap_unmap_dma(struct ion_heap *heap,
struct ion_buffer *buffer)
{
/* XXX undo cache maintenance for dma? */
if (buffer->sglist)
vfree(buffer->sglist);
}
void *ion_system_heap_map_kernel(struct ion_heap *heap,
struct ion_buffer *buffer)
{
return buffer->priv_virt;
}
void ion_system_heap_unmap_kernel(struct ion_heap *heap,
struct ion_buffer *buffer)
{
}
int ion_system_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
struct vm_area_struct *vma)
{
return remap_vmalloc_range(vma, buffer->priv_virt, vma->vm_pgoff);
}
static struct ion_heap_ops vmalloc_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_system_heap_map_kernel,
.unmap_kernel = ion_system_heap_unmap_kernel,
.map_user = ion_system_heap_map_user,
};
struct ion_heap *ion_system_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 = &vmalloc_ops;
heap->type = ION_HEAP_TYPE_SYSTEM;
return heap;
}
void ion_system_heap_destroy(struct ion_heap *heap)
{
kfree(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)
{
buffer->priv_virt = kzalloc(len, GFP_KERNEL);
if (!buffer->priv_virt)
return -ENOMEM;
return 0;
}
void ion_system_contig_heap_free(struct ion_buffer *buffer)
{
kfree(buffer->priv_virt);
}
static int ion_system_contig_heap_phys(struct ion_heap *heap,
struct ion_buffer *buffer,
ion_phys_addr_t *addr, size_t *len)
{
*addr = virt_to_phys(buffer->priv_virt);
*len = buffer->size;
return 0;
}
struct scatterlist *ion_system_contig_heap_map_dma(struct ion_heap *heap,
struct ion_buffer *buffer)
{
struct scatterlist *sglist;
sglist = vmalloc(sizeof(struct scatterlist));
if (!sglist)
return ERR_PTR(-ENOMEM);
sg_init_table(sglist, 1);
sg_set_page(sglist, virt_to_page(buffer->priv_virt), buffer->size, 0);
return sglist;
}
int ion_system_contig_heap_map_user(struct ion_heap *heap,
struct ion_buffer *buffer,
struct vm_area_struct *vma)
{
unsigned long pfn = __phys_to_pfn(virt_to_phys(buffer->priv_virt));
return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
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_heap_unmap_dma,
.map_kernel = ion_system_heap_map_kernel,
.unmap_kernel = ion_system_heap_unmap_kernel,
.map_user = ion_system_contig_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);
}
|
