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-rw-r--r--drivers/gpu/ion/ion_system_mapper.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/gpu/ion/ion_system_mapper.c b/drivers/gpu/ion/ion_system_mapper.c
new file mode 100644
index 00000000000..692458e07b5
--- /dev/null
+++ b/drivers/gpu/ion/ion_system_mapper.c
@@ -0,0 +1,114 @@
1/*
2 * drivers/gpu/ion/ion_system_mapper.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
17#include <linux/err.h>
18#include <linux/ion.h>
19#include <linux/memory.h>
20#include <linux/mm.h>
21#include <linux/slab.h>
22#include <linux/vmalloc.h>
23#include "ion_priv.h"
24/*
25 * This mapper is valid for any heap that allocates memory that already has
26 * a kernel mapping, this includes vmalloc'd memory, kmalloc'd memory,
27 * pages obtained via io_remap, etc.
28 */
29static void *ion_kernel_mapper_map(struct ion_mapper *mapper,
30 struct ion_buffer *buffer,
31 struct ion_mapping **mapping)
32{
33 if (!((1 << buffer->heap->type) & mapper->heap_mask)) {
34 pr_err("%s: attempting to map an unsupported heap\n", __func__);
35 return ERR_PTR(-EINVAL);
36 }
37 /* XXX REVISIT ME!!! */
38 *((unsigned long *)mapping) = (unsigned long)buffer->priv;
39 return buffer->priv;
40}
41
42static void ion_kernel_mapper_unmap(struct ion_mapper *mapper,
43 struct ion_buffer *buffer,
44 struct ion_mapping *mapping)
45{
46 if (!((1 << buffer->heap->type) & mapper->heap_mask))
47 pr_err("%s: attempting to unmap an unsupported heap\n",
48 __func__);
49}
50
51static void *ion_kernel_mapper_map_kernel(struct ion_mapper *mapper,
52 struct ion_buffer *buffer,
53 struct ion_mapping *mapping)
54{
55 if (!((1 << buffer->heap->type) & mapper->heap_mask)) {
56 pr_err("%s: attempting to unmap an unsupported heap\n",
57 __func__);
58 return ERR_PTR(-EINVAL);
59 }
60 return buffer->priv;
61}
62
63static int ion_kernel_mapper_map_user(struct ion_mapper *mapper,
64 struct ion_buffer *buffer,
65 struct vm_area_struct *vma,
66 struct ion_mapping *mapping)
67{
68 int ret;
69
70 switch (buffer->heap->type) {
71 case ION_HEAP_KMALLOC:
72 {
73 unsigned long pfn = __phys_to_pfn(virt_to_phys(buffer->priv));
74 ret = remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
75 vma->vm_end - vma->vm_start,
76 vma->vm_page_prot);
77 break;
78 }
79 case ION_HEAP_VMALLOC:
80 ret = remap_vmalloc_range(vma, buffer->priv, vma->vm_pgoff);
81 break;
82 default:
83 pr_err("%s: attempting to map unsupported heap to userspace\n",
84 __func__);
85 return -EINVAL;
86 }
87
88 return ret;
89}
90
91static struct ion_mapper_ops ops = {
92 .map = ion_kernel_mapper_map,
93 .map_kernel = ion_kernel_mapper_map_kernel,
94 .map_user = ion_kernel_mapper_map_user,
95 .unmap = ion_kernel_mapper_unmap,
96};
97
98struct ion_mapper *ion_system_mapper_create(void)
99{
100 struct ion_mapper *mapper;
101 mapper = kzalloc(sizeof(struct ion_mapper), GFP_KERNEL);
102 if (!mapper)
103 return ERR_PTR(-ENOMEM);
104 mapper->type = ION_SYSTEM_MAPPER;
105 mapper->ops = &ops;
106 mapper->heap_mask = (1 << ION_HEAP_VMALLOC) | (1 << ION_HEAP_KMALLOC);
107 return mapper;
108}
109
110void ion_system_mapper_destroy(struct ion_mapper *mapper)
111{
112 kfree(mapper);
113}
114