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path: root/drivers/media/video/videobuf2-vmalloc.c
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Diffstat (limited to 'drivers/media/video/videobuf2-vmalloc.c')
-rw-r--r--drivers/media/video/videobuf2-vmalloc.c223
1 files changed, 0 insertions, 223 deletions
diff --git a/drivers/media/video/videobuf2-vmalloc.c b/drivers/media/video/videobuf2-vmalloc.c
deleted file mode 100644
index 94efa04d8d55..000000000000
--- a/drivers/media/video/videobuf2-vmalloc.c
+++ /dev/null
@@ -1,223 +0,0 @@
1/*
2 * videobuf2-vmalloc.c - vmalloc memory allocator for videobuf2
3 *
4 * Copyright (C) 2010 Samsung Electronics
5 *
6 * Author: Pawel Osciak <pawel@osciak.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation.
11 */
12
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/mm.h>
16#include <linux/sched.h>
17#include <linux/slab.h>
18#include <linux/vmalloc.h>
19
20#include <media/videobuf2-core.h>
21#include <media/videobuf2-vmalloc.h>
22#include <media/videobuf2-memops.h>
23
24struct vb2_vmalloc_buf {
25 void *vaddr;
26 struct page **pages;
27 struct vm_area_struct *vma;
28 int write;
29 unsigned long size;
30 unsigned int n_pages;
31 atomic_t refcount;
32 struct vb2_vmarea_handler handler;
33};
34
35static void vb2_vmalloc_put(void *buf_priv);
36
37static void *vb2_vmalloc_alloc(void *alloc_ctx, unsigned long size)
38{
39 struct vb2_vmalloc_buf *buf;
40
41 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
42 if (!buf)
43 return NULL;
44
45 buf->size = size;
46 buf->vaddr = vmalloc_user(buf->size);
47 buf->handler.refcount = &buf->refcount;
48 buf->handler.put = vb2_vmalloc_put;
49 buf->handler.arg = buf;
50
51 if (!buf->vaddr) {
52 pr_debug("vmalloc of size %ld failed\n", buf->size);
53 kfree(buf);
54 return NULL;
55 }
56
57 atomic_inc(&buf->refcount);
58 return buf;
59}
60
61static void vb2_vmalloc_put(void *buf_priv)
62{
63 struct vb2_vmalloc_buf *buf = buf_priv;
64
65 if (atomic_dec_and_test(&buf->refcount)) {
66 vfree(buf->vaddr);
67 kfree(buf);
68 }
69}
70
71static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr,
72 unsigned long size, int write)
73{
74 struct vb2_vmalloc_buf *buf;
75 unsigned long first, last;
76 int n_pages, offset;
77 struct vm_area_struct *vma;
78 dma_addr_t physp;
79
80 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
81 if (!buf)
82 return NULL;
83
84 buf->write = write;
85 offset = vaddr & ~PAGE_MASK;
86 buf->size = size;
87
88
89 vma = find_vma(current->mm, vaddr);
90 if (vma && (vma->vm_flags & VM_PFNMAP) && (vma->vm_pgoff)) {
91 if (vb2_get_contig_userptr(vaddr, size, &vma, &physp))
92 goto fail_pages_array_alloc;
93 buf->vma = vma;
94 buf->vaddr = ioremap_nocache(physp, size);
95 if (!buf->vaddr)
96 goto fail_pages_array_alloc;
97 } else {
98 first = vaddr >> PAGE_SHIFT;
99 last = (vaddr + size - 1) >> PAGE_SHIFT;
100 buf->n_pages = last - first + 1;
101 buf->pages = kzalloc(buf->n_pages * sizeof(struct page *),
102 GFP_KERNEL);
103 if (!buf->pages)
104 goto fail_pages_array_alloc;
105
106 /* current->mm->mmap_sem is taken by videobuf2 core */
107 n_pages = get_user_pages(current, current->mm,
108 vaddr & PAGE_MASK, buf->n_pages,
109 write, 1, /* force */
110 buf->pages, NULL);
111 if (n_pages != buf->n_pages)
112 goto fail_get_user_pages;
113
114 buf->vaddr = vm_map_ram(buf->pages, buf->n_pages, -1,
115 PAGE_KERNEL);
116 if (!buf->vaddr)
117 goto fail_get_user_pages;
118 }
119
120 buf->vaddr += offset;
121 return buf;
122
123fail_get_user_pages:
124 pr_debug("get_user_pages requested/got: %d/%d]\n", n_pages,
125 buf->n_pages);
126 while (--n_pages >= 0)
127 put_page(buf->pages[n_pages]);
128 kfree(buf->pages);
129
130fail_pages_array_alloc:
131 kfree(buf);
132
133 return NULL;
134}
135
136static void vb2_vmalloc_put_userptr(void *buf_priv)
137{
138 struct vb2_vmalloc_buf *buf = buf_priv;
139 unsigned long vaddr = (unsigned long)buf->vaddr & PAGE_MASK;
140 unsigned int i;
141
142 if (buf->pages) {
143 if (vaddr)
144 vm_unmap_ram((void *)vaddr, buf->n_pages);
145 for (i = 0; i < buf->n_pages; ++i) {
146 if (buf->write)
147 set_page_dirty_lock(buf->pages[i]);
148 put_page(buf->pages[i]);
149 }
150 kfree(buf->pages);
151 } else {
152 if (buf->vma)
153 vb2_put_vma(buf->vma);
154 iounmap(buf->vaddr);
155 }
156 kfree(buf);
157}
158
159static void *vb2_vmalloc_vaddr(void *buf_priv)
160{
161 struct vb2_vmalloc_buf *buf = buf_priv;
162
163 if (!buf->vaddr) {
164 pr_err("Address of an unallocated plane requested "
165 "or cannot map user pointer\n");
166 return NULL;
167 }
168
169 return buf->vaddr;
170}
171
172static unsigned int vb2_vmalloc_num_users(void *buf_priv)
173{
174 struct vb2_vmalloc_buf *buf = buf_priv;
175 return atomic_read(&buf->refcount);
176}
177
178static int vb2_vmalloc_mmap(void *buf_priv, struct vm_area_struct *vma)
179{
180 struct vb2_vmalloc_buf *buf = buf_priv;
181 int ret;
182
183 if (!buf) {
184 pr_err("No memory to map\n");
185 return -EINVAL;
186 }
187
188 ret = remap_vmalloc_range(vma, buf->vaddr, 0);
189 if (ret) {
190 pr_err("Remapping vmalloc memory, error: %d\n", ret);
191 return ret;
192 }
193
194 /*
195 * Make sure that vm_areas for 2 buffers won't be merged together
196 */
197 vma->vm_flags |= VM_DONTEXPAND;
198
199 /*
200 * Use common vm_area operations to track buffer refcount.
201 */
202 vma->vm_private_data = &buf->handler;
203 vma->vm_ops = &vb2_common_vm_ops;
204
205 vma->vm_ops->open(vma);
206
207 return 0;
208}
209
210const struct vb2_mem_ops vb2_vmalloc_memops = {
211 .alloc = vb2_vmalloc_alloc,
212 .put = vb2_vmalloc_put,
213 .get_userptr = vb2_vmalloc_get_userptr,
214 .put_userptr = vb2_vmalloc_put_userptr,
215 .vaddr = vb2_vmalloc_vaddr,
216 .mmap = vb2_vmalloc_mmap,
217 .num_users = vb2_vmalloc_num_users,
218};
219EXPORT_SYMBOL_GPL(vb2_vmalloc_memops);
220
221MODULE_DESCRIPTION("vmalloc memory handling routines for videobuf2");
222MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>");
223MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-10 00:10:53 -0500