tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2013 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7#include <linux/dma-buf.h>
8
9#include <drm/drm_drv.h>
10#include <drm/drm_prime.h>
11
12#include "msm_drv.h"
13#include "msm_gem.h"
14
15struct sg_table *msm_gem_prime_get_sg_table(struct drm_gem_object *obj)
16{
17 struct msm_gem_object *msm_obj = to_msm_bo(obj);
18 size_t npages = obj->size >> PAGE_SHIFT;
19
20 if (msm_obj->flags & MSM_BO_NO_SHARE)
21 return ERR_PTR(-EINVAL);
22
23 if (WARN_ON(!msm_obj->pages)) /* should have already pinned! */
24 return ERR_PTR(-ENOMEM);
25
26 return drm_prime_pages_to_sg(obj->dev, msm_obj->pages, npages);
27}
28
29int msm_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
30{
31 void *vaddr;
32
33 vaddr = msm_gem_get_vaddr_locked(obj);
34 if (IS_ERR(vaddr))
35 return PTR_ERR(vaddr);
36 iosys_map_set_vaddr(map, vaddr);
37
38 return 0;
39}
40
41void msm_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
42{
43 msm_gem_put_vaddr_locked(obj);
44}
45
46static void msm_gem_dmabuf_release(struct dma_buf *dma_buf)
47{
48 struct drm_gem_object *obj = dma_buf->priv;
49
50 msm_gem_vma_put(obj);
51 drm_gem_dmabuf_release(dma_buf);
52}
53
54static const struct dma_buf_ops msm_gem_prime_dmabuf_ops = {
55 .attach = drm_gem_map_attach,
56 .detach = drm_gem_map_detach,
57 .map_dma_buf = drm_gem_map_dma_buf,
58 .unmap_dma_buf = drm_gem_unmap_dma_buf,
59 .release = msm_gem_dmabuf_release,
60 .mmap = drm_gem_dmabuf_mmap,
61 .vmap = drm_gem_dmabuf_vmap,
62 .vunmap = drm_gem_dmabuf_vunmap,
63};
64
65struct drm_gem_object *msm_gem_prime_import(struct drm_device *dev,
66 struct dma_buf *buf)
67{
68 if (buf->ops == &msm_gem_prime_dmabuf_ops) {
69 struct drm_gem_object *obj = buf->priv;
70 if (obj->dev == dev) {
71 /*
72 * Importing dmabuf exported from our own gem increases
73 * refcount on gem itself instead of f_count of dmabuf.
74 */
75 drm_gem_object_get(obj);
76 return obj;
77 }
78 }
79
80 return drm_gem_prime_import(dev, buf);
81}
82
83struct drm_gem_object *msm_gem_prime_import_sg_table(struct drm_device *dev,
84 struct dma_buf_attachment *attach, struct sg_table *sg)
85{
86 return msm_gem_import(dev, attach->dmabuf, sg);
87}
88
89struct dma_buf *msm_gem_prime_export(struct drm_gem_object *obj, int flags)
90{
91 if (to_msm_bo(obj)->flags & MSM_BO_NO_SHARE)
92 return ERR_PTR(-EPERM);
93
94 msm_gem_vma_get(obj);
95
96 struct drm_device *dev = obj->dev;
97 struct dma_buf_export_info exp_info = {
98 .exp_name = KBUILD_MODNAME, /* white lie for debug */
99 .owner = dev->driver->fops->owner,
100 .ops = &msm_gem_prime_dmabuf_ops,
101 .size = obj->size,
102 .flags = flags,
103 .priv = obj,
104 .resv = obj->resv,
105 };
106
107 return drm_gem_dmabuf_export(dev, &exp_info);
108}
109
110int msm_gem_prime_pin(struct drm_gem_object *obj)
111{
112 struct page **pages;
113 int ret = 0;
114
115 if (drm_gem_is_imported(obj))
116 return 0;
117
118 if (to_msm_bo(obj)->flags & MSM_BO_NO_SHARE)
119 return -EINVAL;
120
121 pages = msm_gem_pin_pages_locked(obj);
122 if (IS_ERR(pages))
123 ret = PTR_ERR(pages);
124
125 return ret;
126}
127
128void msm_gem_prime_unpin(struct drm_gem_object *obj)
129{
130 if (drm_gem_is_imported(obj))
131 return;
132
133 msm_gem_unpin_pages_locked(obj);
134}