diff options
Diffstat (limited to 'drivers/gpu/ion/ion_system_mapper.c')
-rw-r--r-- | drivers/gpu/ion/ion_system_mapper.c | 114 |
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 | */ | ||
29 | static 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 | |||
42 | static 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 | |||
51 | static 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 | |||
63 | static 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 | |||
91 | static 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 | |||
98 | struct 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 | |||
110 | void ion_system_mapper_destroy(struct ion_mapper *mapper) | ||
111 | { | ||
112 | kfree(mapper); | ||
113 | } | ||
114 | |||