1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2014-2018 Etnaviv Project
4 */
5
6 #include <drm/drm_prime.h>
7 #include <linux/dma-buf.h>
8 #include <linux/module.h>
9
10 #include "etnaviv_drv.h"
11 #include "etnaviv_gem.h"
12
13 MODULE_IMPORT_NS("DMA_BUF");
14
15 static struct lock_class_key etnaviv_prime_lock_class;
16
etnaviv_gem_prime_get_sg_table(struct drm_gem_object * obj)17 struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
18 {
19 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
20 unsigned int npages = obj->size >> PAGE_SHIFT;
21
22 if (WARN_ON(!etnaviv_obj->pages)) /* should have already pinned! */
23 return ERR_PTR(-EINVAL);
24
25 return drm_prime_pages_to_sg(obj->dev, etnaviv_obj->pages, npages);
26 }
27
etnaviv_gem_prime_vmap(struct drm_gem_object * obj,struct iosys_map * map)28 int etnaviv_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
29 {
30 void *vaddr;
31
32 vaddr = etnaviv_gem_vmap(obj);
33 if (!vaddr)
34 return -ENOMEM;
35 iosys_map_set_vaddr(map, vaddr);
36
37 return 0;
38 }
39
etnaviv_gem_prime_pin(struct drm_gem_object * obj)40 int etnaviv_gem_prime_pin(struct drm_gem_object *obj)
41 {
42 if (!obj->import_attach) {
43 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
44
45 mutex_lock(&etnaviv_obj->lock);
46 etnaviv_gem_get_pages(etnaviv_obj);
47 mutex_unlock(&etnaviv_obj->lock);
48 }
49 return 0;
50 }
51
etnaviv_gem_prime_unpin(struct drm_gem_object * obj)52 void etnaviv_gem_prime_unpin(struct drm_gem_object *obj)
53 {
54 if (!obj->import_attach) {
55 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
56
57 mutex_lock(&etnaviv_obj->lock);
58 etnaviv_gem_put_pages(to_etnaviv_bo(obj));
59 mutex_unlock(&etnaviv_obj->lock);
60 }
61 }
62
etnaviv_gem_prime_release(struct etnaviv_gem_object * etnaviv_obj)63 static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj)
64 {
65 struct iosys_map map = IOSYS_MAP_INIT_VADDR(etnaviv_obj->vaddr);
66
67 if (etnaviv_obj->vaddr)
68 dma_buf_vunmap_unlocked(etnaviv_obj->base.import_attach->dmabuf, &map);
69
70 /* Don't drop the pages for imported dmabuf, as they are not
71 * ours, just free the array we allocated:
72 */
73 kvfree(etnaviv_obj->pages);
74
75 drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt);
76 }
77
etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object * etnaviv_obj)78 static void *etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object *etnaviv_obj)
79 {
80 struct iosys_map map;
81 int ret;
82
83 lockdep_assert_held(&etnaviv_obj->lock);
84
85 ret = dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf, &map);
86 if (ret)
87 return NULL;
88 return map.vaddr;
89 }
90
etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object * etnaviv_obj,struct vm_area_struct * vma)91 static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
92 struct vm_area_struct *vma)
93 {
94 int ret;
95
96 ret = dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
97 if (!ret) {
98 /* Drop the reference acquired by drm_gem_mmap_obj(). */
99 drm_gem_object_put(&etnaviv_obj->base);
100 }
101
102 return ret;
103 }
104
105 static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = {
106 /* .get_pages should never be called */
107 .release = etnaviv_gem_prime_release,
108 .vmap = etnaviv_gem_prime_vmap_impl,
109 .mmap = etnaviv_gem_prime_mmap_obj,
110 };
111
etnaviv_gem_prime_import_sg_table(struct drm_device * dev,struct dma_buf_attachment * attach,struct sg_table * sgt)112 struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
113 struct dma_buf_attachment *attach, struct sg_table *sgt)
114 {
115 struct etnaviv_gem_object *etnaviv_obj;
116 size_t size = PAGE_ALIGN(attach->dmabuf->size);
117 int ret, npages;
118
119 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC,
120 &etnaviv_gem_prime_ops, &etnaviv_obj);
121 if (ret < 0)
122 return ERR_PTR(ret);
123
124 lockdep_set_class(&etnaviv_obj->lock, &etnaviv_prime_lock_class);
125
126 npages = size / PAGE_SIZE;
127
128 etnaviv_obj->sgt = sgt;
129 etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
130 if (!etnaviv_obj->pages) {
131 ret = -ENOMEM;
132 goto fail;
133 }
134
135 ret = drm_prime_sg_to_page_array(sgt, etnaviv_obj->pages, npages);
136 if (ret)
137 goto fail;
138
139 etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
140
141 return &etnaviv_obj->base;
142
143 fail:
144 drm_gem_object_put(&etnaviv_obj->base);
145
146 return ERR_PTR(ret);
147 }
148