diff options
author | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
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committer | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
commit | fcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch) | |
tree | a57612d1888735a2ec7972891b68c1ac5ec8faea /drivers/gpu/ion/ion_system_heap.c | |
parent | 8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff) |
Diffstat (limited to 'drivers/gpu/ion/ion_system_heap.c')
-rw-r--r-- | drivers/gpu/ion/ion_system_heap.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/gpu/ion/ion_system_heap.c b/drivers/gpu/ion/ion_system_heap.c new file mode 100644 index 00000000000..c046cf1a321 --- /dev/null +++ b/drivers/gpu/ion/ion_system_heap.c | |||
@@ -0,0 +1,198 @@ | |||
1 | /* | ||
2 | * drivers/gpu/ion/ion_system_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 | |||
17 | #include <linux/err.h> | ||
18 | #include <linux/ion.h> | ||
19 | #include <linux/mm.h> | ||
20 | #include <linux/scatterlist.h> | ||
21 | #include <linux/slab.h> | ||
22 | #include <linux/vmalloc.h> | ||
23 | #include "ion_priv.h" | ||
24 | |||
25 | static int ion_system_heap_allocate(struct ion_heap *heap, | ||
26 | struct ion_buffer *buffer, | ||
27 | unsigned long size, unsigned long align, | ||
28 | unsigned long flags) | ||
29 | { | ||
30 | buffer->priv_virt = vmalloc_user(size); | ||
31 | if (!buffer->priv_virt) | ||
32 | return -ENOMEM; | ||
33 | return 0; | ||
34 | } | ||
35 | |||
36 | void ion_system_heap_free(struct ion_buffer *buffer) | ||
37 | { | ||
38 | vfree(buffer->priv_virt); | ||
39 | } | ||
40 | |||
41 | struct scatterlist *ion_system_heap_map_dma(struct ion_heap *heap, | ||
42 | struct ion_buffer *buffer) | ||
43 | { | ||
44 | struct scatterlist *sglist; | ||
45 | struct page *page; | ||
46 | int i; | ||
47 | int npages = PAGE_ALIGN(buffer->size) / PAGE_SIZE; | ||
48 | void *vaddr = buffer->priv_virt; | ||
49 | |||
50 | sglist = vmalloc(npages * sizeof(struct scatterlist)); | ||
51 | if (!sglist) | ||
52 | return ERR_PTR(-ENOMEM); | ||
53 | memset(sglist, 0, npages * sizeof(struct scatterlist)); | ||
54 | sg_init_table(sglist, npages); | ||
55 | for (i = 0; i < npages; i++) { | ||
56 | page = vmalloc_to_page(vaddr); | ||
57 | if (!page) | ||
58 | goto end; | ||
59 | sg_set_page(&sglist[i], page, PAGE_SIZE, 0); | ||
60 | vaddr += PAGE_SIZE; | ||
61 | } | ||
62 | /* XXX do cache maintenance for dma? */ | ||
63 | return sglist; | ||
64 | end: | ||
65 | vfree(sglist); | ||
66 | return NULL; | ||
67 | } | ||
68 | |||
69 | void ion_system_heap_unmap_dma(struct ion_heap *heap, | ||
70 | struct ion_buffer *buffer) | ||
71 | { | ||
72 | /* XXX undo cache maintenance for dma? */ | ||
73 | if (buffer->sglist) | ||
74 | vfree(buffer->sglist); | ||
75 | } | ||
76 | |||
77 | void *ion_system_heap_map_kernel(struct ion_heap *heap, | ||
78 | struct ion_buffer *buffer) | ||
79 | { | ||
80 | return buffer->priv_virt; | ||
81 | } | ||
82 | |||
83 | void ion_system_heap_unmap_kernel(struct ion_heap *heap, | ||
84 | struct ion_buffer *buffer) | ||
85 | { | ||
86 | } | ||
87 | |||
88 | int ion_system_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer, | ||
89 | struct vm_area_struct *vma) | ||
90 | { | ||
91 | return remap_vmalloc_range(vma, buffer->priv_virt, vma->vm_pgoff); | ||
92 | } | ||
93 | |||
94 | static struct ion_heap_ops vmalloc_ops = { | ||
95 | .allocate = ion_system_heap_allocate, | ||
96 | .free = ion_system_heap_free, | ||
97 | .map_dma = ion_system_heap_map_dma, | ||
98 | .unmap_dma = ion_system_heap_unmap_dma, | ||
99 | .map_kernel = ion_system_heap_map_kernel, | ||
100 | .unmap_kernel = ion_system_heap_unmap_kernel, | ||
101 | .map_user = ion_system_heap_map_user, | ||
102 | }; | ||
103 | |||
104 | struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused) | ||
105 | { | ||
106 | struct ion_heap *heap; | ||
107 | |||
108 | heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL); | ||
109 | if (!heap) | ||
110 | return ERR_PTR(-ENOMEM); | ||
111 | heap->ops = &vmalloc_ops; | ||
112 | heap->type = ION_HEAP_TYPE_SYSTEM; | ||
113 | return heap; | ||
114 | } | ||
115 | |||
116 | void ion_system_heap_destroy(struct ion_heap *heap) | ||
117 | { | ||
118 | kfree(heap); | ||
119 | } | ||
120 | |||
121 | static int ion_system_contig_heap_allocate(struct ion_heap *heap, | ||
122 | struct ion_buffer *buffer, | ||
123 | unsigned long len, | ||
124 | unsigned long align, | ||
125 | unsigned long flags) | ||
126 | { | ||
127 | buffer->priv_virt = kzalloc(len, GFP_KERNEL); | ||
128 | if (!buffer->priv_virt) | ||
129 | return -ENOMEM; | ||
130 | return 0; | ||
131 | } | ||
132 | |||
133 | void ion_system_contig_heap_free(struct ion_buffer *buffer) | ||
134 | { | ||
135 | kfree(buffer->priv_virt); | ||
136 | } | ||
137 | |||
138 | static int ion_system_contig_heap_phys(struct ion_heap *heap, | ||
139 | struct ion_buffer *buffer, | ||
140 | ion_phys_addr_t *addr, size_t *len) | ||
141 | { | ||
142 | *addr = virt_to_phys(buffer->priv_virt); | ||
143 | *len = buffer->size; | ||
144 | return 0; | ||
145 | } | ||
146 | |||
147 | struct scatterlist *ion_system_contig_heap_map_dma(struct ion_heap *heap, | ||
148 | struct ion_buffer *buffer) | ||
149 | { | ||
150 | struct scatterlist *sglist; | ||
151 | |||
152 | sglist = vmalloc(sizeof(struct scatterlist)); | ||
153 | if (!sglist) | ||
154 | return ERR_PTR(-ENOMEM); | ||
155 | sg_init_table(sglist, 1); | ||
156 | sg_set_page(sglist, virt_to_page(buffer->priv_virt), buffer->size, 0); | ||
157 | return sglist; | ||
158 | } | ||
159 | |||
160 | int ion_system_contig_heap_map_user(struct ion_heap *heap, | ||
161 | struct ion_buffer *buffer, | ||
162 | struct vm_area_struct *vma) | ||
163 | { | ||
164 | unsigned long pfn = __phys_to_pfn(virt_to_phys(buffer->priv_virt)); | ||
165 | return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff, | ||
166 | vma->vm_end - vma->vm_start, | ||
167 | vma->vm_page_prot); | ||
168 | |||
169 | } | ||
170 | |||
171 | static struct ion_heap_ops kmalloc_ops = { | ||
172 | .allocate = ion_system_contig_heap_allocate, | ||
173 | .free = ion_system_contig_heap_free, | ||
174 | .phys = ion_system_contig_heap_phys, | ||
175 | .map_dma = ion_system_contig_heap_map_dma, | ||
176 | .unmap_dma = ion_system_heap_unmap_dma, | ||
177 | .map_kernel = ion_system_heap_map_kernel, | ||
178 | .unmap_kernel = ion_system_heap_unmap_kernel, | ||
179 | .map_user = ion_system_contig_heap_map_user, | ||
180 | }; | ||
181 | |||
182 | struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *unused) | ||
183 | { | ||
184 | struct ion_heap *heap; | ||
185 | |||
186 | heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL); | ||
187 | if (!heap) | ||
188 | return ERR_PTR(-ENOMEM); | ||
189 | heap->ops = &kmalloc_ops; | ||
190 | heap->type = ION_HEAP_TYPE_SYSTEM_CONTIG; | ||
191 | return heap; | ||
192 | } | ||
193 | |||
194 | void ion_system_contig_heap_destroy(struct ion_heap *heap) | ||
195 | { | ||
196 | kfree(heap); | ||
197 | } | ||
198 | |||