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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2015 MediaTek Inc.
4 */
5
6#include <linux/dma-buf.h>
7
8#include <drm/drm.h>
9#include <drm/drm_device.h>
10#include <drm/drm_gem.h>
11#include <drm/drm_gem_dma_helper.h>
12#include <drm/drm_prime.h>
13
14#include "mtk_drm_drv.h"
15#include "mtk_drm_gem.h"
16
17static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
18
19static const struct vm_operations_struct vm_ops = {
20 .open = drm_gem_vm_open,
21 .close = drm_gem_vm_close,
22};
23
24static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
25 .free = mtk_drm_gem_free_object,
26 .get_sg_table = mtk_gem_prime_get_sg_table,
27 .vmap = mtk_drm_gem_prime_vmap,
28 .vunmap = mtk_drm_gem_prime_vunmap,
29 .mmap = mtk_drm_gem_object_mmap,
30 .vm_ops = &vm_ops,
31};
32
33static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
34 unsigned long size)
35{
36 struct mtk_drm_gem_obj *mtk_gem_obj;
37 int ret;
38
39 size = round_up(size, PAGE_SIZE);
40
41 mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
42 if (!mtk_gem_obj)
43 return ERR_PTR(-ENOMEM);
44
45 mtk_gem_obj->base.funcs = &mtk_drm_gem_object_funcs;
46
47 ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
48 if (ret < 0) {
49 DRM_ERROR("failed to initialize gem object\n");
50 kfree(mtk_gem_obj);
51 return ERR_PTR(ret);
52 }
53
54 return mtk_gem_obj;
55}
56
57struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
58 size_t size, bool alloc_kmap)
59{
60 struct mtk_drm_private *priv = dev->dev_private;
61 struct mtk_drm_gem_obj *mtk_gem;
62 struct drm_gem_object *obj;
63 int ret;
64
65 mtk_gem = mtk_drm_gem_init(dev, size);
66 if (IS_ERR(mtk_gem))
67 return ERR_CAST(mtk_gem);
68
69 obj = &mtk_gem->base;
70
71 mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
72
73 if (!alloc_kmap)
74 mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
75
76 mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
77 &mtk_gem->dma_addr, GFP_KERNEL,
78 mtk_gem->dma_attrs);
79 if (!mtk_gem->cookie) {
80 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
81 ret = -ENOMEM;
82 goto err_gem_free;
83 }
84
85 if (alloc_kmap)
86 mtk_gem->kvaddr = mtk_gem->cookie;
87
88 DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
89 mtk_gem->cookie, &mtk_gem->dma_addr,
90 size);
91
92 return mtk_gem;
93
94err_gem_free:
95 drm_gem_object_release(obj);
96 kfree(mtk_gem);
97 return ERR_PTR(ret);
98}
99
100void mtk_drm_gem_free_object(struct drm_gem_object *obj)
101{
102 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
103 struct mtk_drm_private *priv = obj->dev->dev_private;
104
105 if (mtk_gem->sg)
106 drm_prime_gem_destroy(obj, mtk_gem->sg);
107 else
108 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
109 mtk_gem->dma_addr, mtk_gem->dma_attrs);
110
111 /* release file pointer to gem object. */
112 drm_gem_object_release(obj);
113
114 kfree(mtk_gem);
115}
116
117int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
118 struct drm_mode_create_dumb *args)
119{
120 struct mtk_drm_gem_obj *mtk_gem;
121 int ret;
122
123 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
124
125 /*
126 * Multiply 2 variables of different types,
127 * for example: args->size = args->spacing * args->height;
128 * may cause coverity issue with unintentional overflow.
129 */
130 args->size = args->pitch;
131 args->size *= args->height;
132
133 mtk_gem = mtk_drm_gem_create(dev, args->size, false);
134 if (IS_ERR(mtk_gem))
135 return PTR_ERR(mtk_gem);
136
137 /*
138 * allocate a id of idr table where the obj is registered
139 * and handle has the id what user can see.
140 */
141 ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
142 if (ret)
143 goto err_handle_create;
144
145 /* drop reference from allocate - handle holds it now. */
146 drm_gem_object_put(&mtk_gem->base);
147
148 return 0;
149
150err_handle_create:
151 mtk_drm_gem_free_object(&mtk_gem->base);
152 return ret;
153}
154
155static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
156 struct vm_area_struct *vma)
157
158{
159 int ret;
160 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
161 struct mtk_drm_private *priv = obj->dev->dev_private;
162
163 /*
164 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
165 * whole buffer from the start.
166 */
167 vma->vm_pgoff = 0;
168
169 /*
170 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
171 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
172 */
173 vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
174 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
175 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
176
177 ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
178 mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
179
180 return ret;
181}
182
183/*
184 * Allocate a sg_table for this GEM object.
185 * Note: Both the table's contents, and the sg_table itself must be freed by
186 * the caller.
187 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
188 */
189struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
190{
191 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
192 struct mtk_drm_private *priv = obj->dev->dev_private;
193 struct sg_table *sgt;
194 int ret;
195
196 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
197 if (!sgt)
198 return ERR_PTR(-ENOMEM);
199
200 ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
201 mtk_gem->dma_addr, obj->size,
202 mtk_gem->dma_attrs);
203 if (ret) {
204 DRM_ERROR("failed to allocate sgt, %d\n", ret);
205 kfree(sgt);
206 return ERR_PTR(ret);
207 }
208
209 return sgt;
210}
211
212struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
213 struct dma_buf_attachment *attach, struct sg_table *sg)
214{
215 struct mtk_drm_gem_obj *mtk_gem;
216
217 /* check if the entries in the sg_table are contiguous */
218 if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
219 DRM_ERROR("sg_table is not contiguous");
220 return ERR_PTR(-EINVAL);
221 }
222
223 mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
224 if (IS_ERR(mtk_gem))
225 return ERR_CAST(mtk_gem);
226
227 mtk_gem->dma_addr = sg_dma_address(sg->sgl);
228 mtk_gem->sg = sg;
229
230 return &mtk_gem->base;
231}
232
233int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
234{
235 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
236 struct sg_table *sgt = NULL;
237 unsigned int npages;
238
239 if (mtk_gem->kvaddr)
240 goto out;
241
242 sgt = mtk_gem_prime_get_sg_table(obj);
243 if (IS_ERR(sgt))
244 return PTR_ERR(sgt);
245
246 npages = obj->size >> PAGE_SHIFT;
247 mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
248 if (!mtk_gem->pages) {
249 sg_free_table(sgt);
250 kfree(sgt);
251 return -ENOMEM;
252 }
253
254 drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);
255
256 mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
257 pgprot_writecombine(PAGE_KERNEL));
258 if (!mtk_gem->kvaddr) {
259 sg_free_table(sgt);
260 kfree(sgt);
261 kfree(mtk_gem->pages);
262 return -ENOMEM;
263 }
264 sg_free_table(sgt);
265 kfree(sgt);
266
267out:
268 iosys_map_set_vaddr(map, mtk_gem->kvaddr);
269
270 return 0;
271}
272
273void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
274 struct iosys_map *map)
275{
276 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
277 void *vaddr = map->vaddr;
278
279 if (!mtk_gem->pages)
280 return;
281
282 vunmap(vaddr);
283 mtk_gem->kvaddr = NULL;
284 kfree(mtk_gem->pages);
285}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2015 MediaTek Inc.
4 */
5
6#include <linux/dma-buf.h>
7
8#include <drm/drm.h>
9#include <drm/drm_device.h>
10#include <drm/drm_gem.h>
11#include <drm/drm_gem_dma_helper.h>
12#include <drm/drm_prime.h>
13
14#include "mtk_drm_drv.h"
15#include "mtk_drm_gem.h"
16
17static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
18
19static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
20 .free = mtk_drm_gem_free_object,
21 .get_sg_table = mtk_gem_prime_get_sg_table,
22 .vmap = mtk_drm_gem_prime_vmap,
23 .vunmap = mtk_drm_gem_prime_vunmap,
24 .mmap = mtk_drm_gem_object_mmap,
25 .vm_ops = &drm_gem_dma_vm_ops,
26};
27
28static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
29 unsigned long size)
30{
31 struct mtk_drm_gem_obj *mtk_gem_obj;
32 int ret;
33
34 size = round_up(size, PAGE_SIZE);
35
36 mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
37 if (!mtk_gem_obj)
38 return ERR_PTR(-ENOMEM);
39
40 mtk_gem_obj->base.funcs = &mtk_drm_gem_object_funcs;
41
42 ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
43 if (ret < 0) {
44 DRM_ERROR("failed to initialize gem object\n");
45 kfree(mtk_gem_obj);
46 return ERR_PTR(ret);
47 }
48
49 return mtk_gem_obj;
50}
51
52struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
53 size_t size, bool alloc_kmap)
54{
55 struct mtk_drm_private *priv = dev->dev_private;
56 struct mtk_drm_gem_obj *mtk_gem;
57 struct drm_gem_object *obj;
58 int ret;
59
60 mtk_gem = mtk_drm_gem_init(dev, size);
61 if (IS_ERR(mtk_gem))
62 return ERR_CAST(mtk_gem);
63
64 obj = &mtk_gem->base;
65
66 mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
67
68 if (!alloc_kmap)
69 mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
70
71 mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
72 &mtk_gem->dma_addr, GFP_KERNEL,
73 mtk_gem->dma_attrs);
74 if (!mtk_gem->cookie) {
75 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
76 ret = -ENOMEM;
77 goto err_gem_free;
78 }
79
80 if (alloc_kmap)
81 mtk_gem->kvaddr = mtk_gem->cookie;
82
83 DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
84 mtk_gem->cookie, &mtk_gem->dma_addr,
85 size);
86
87 return mtk_gem;
88
89err_gem_free:
90 drm_gem_object_release(obj);
91 kfree(mtk_gem);
92 return ERR_PTR(ret);
93}
94
95void mtk_drm_gem_free_object(struct drm_gem_object *obj)
96{
97 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
98 struct mtk_drm_private *priv = obj->dev->dev_private;
99
100 if (mtk_gem->sg)
101 drm_prime_gem_destroy(obj, mtk_gem->sg);
102 else
103 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
104 mtk_gem->dma_addr, mtk_gem->dma_attrs);
105
106 /* release file pointer to gem object. */
107 drm_gem_object_release(obj);
108
109 kfree(mtk_gem);
110}
111
112int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
113 struct drm_mode_create_dumb *args)
114{
115 struct mtk_drm_gem_obj *mtk_gem;
116 int ret;
117
118 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
119 args->size = args->pitch * args->height;
120
121 mtk_gem = mtk_drm_gem_create(dev, args->size, false);
122 if (IS_ERR(mtk_gem))
123 return PTR_ERR(mtk_gem);
124
125 /*
126 * allocate a id of idr table where the obj is registered
127 * and handle has the id what user can see.
128 */
129 ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
130 if (ret)
131 goto err_handle_create;
132
133 /* drop reference from allocate - handle holds it now. */
134 drm_gem_object_put(&mtk_gem->base);
135
136 return 0;
137
138err_handle_create:
139 mtk_drm_gem_free_object(&mtk_gem->base);
140 return ret;
141}
142
143static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
144 struct vm_area_struct *vma)
145
146{
147 int ret;
148 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
149 struct mtk_drm_private *priv = obj->dev->dev_private;
150
151 /*
152 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
153 * whole buffer from the start.
154 */
155 vma->vm_pgoff = 0;
156
157 /*
158 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
159 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
160 */
161 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
162 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
163 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
164
165 ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
166 mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
167 if (ret)
168 drm_gem_vm_close(vma);
169
170 return ret;
171}
172
173/*
174 * Allocate a sg_table for this GEM object.
175 * Note: Both the table's contents, and the sg_table itself must be freed by
176 * the caller.
177 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
178 */
179struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
180{
181 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
182 struct mtk_drm_private *priv = obj->dev->dev_private;
183 struct sg_table *sgt;
184 int ret;
185
186 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
187 if (!sgt)
188 return ERR_PTR(-ENOMEM);
189
190 ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
191 mtk_gem->dma_addr, obj->size,
192 mtk_gem->dma_attrs);
193 if (ret) {
194 DRM_ERROR("failed to allocate sgt, %d\n", ret);
195 kfree(sgt);
196 return ERR_PTR(ret);
197 }
198
199 return sgt;
200}
201
202struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
203 struct dma_buf_attachment *attach, struct sg_table *sg)
204{
205 struct mtk_drm_gem_obj *mtk_gem;
206
207 /* check if the entries in the sg_table are contiguous */
208 if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
209 DRM_ERROR("sg_table is not contiguous");
210 return ERR_PTR(-EINVAL);
211 }
212
213 mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
214 if (IS_ERR(mtk_gem))
215 return ERR_CAST(mtk_gem);
216
217 mtk_gem->dma_addr = sg_dma_address(sg->sgl);
218 mtk_gem->sg = sg;
219
220 return &mtk_gem->base;
221}
222
223int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
224{
225 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
226 struct sg_table *sgt = NULL;
227 unsigned int npages;
228
229 if (mtk_gem->kvaddr)
230 goto out;
231
232 sgt = mtk_gem_prime_get_sg_table(obj);
233 if (IS_ERR(sgt))
234 return PTR_ERR(sgt);
235
236 npages = obj->size >> PAGE_SHIFT;
237 mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
238 if (!mtk_gem->pages) {
239 kfree(sgt);
240 return -ENOMEM;
241 }
242
243 drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);
244
245 mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
246 pgprot_writecombine(PAGE_KERNEL));
247
248out:
249 kfree(sgt);
250 iosys_map_set_vaddr(map, mtk_gem->kvaddr);
251
252 return 0;
253}
254
255void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
256 struct iosys_map *map)
257{
258 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
259 void *vaddr = map->vaddr;
260
261 if (!mtk_gem->pages)
262 return;
263
264 vunmap(vaddr);
265 mtk_gem->kvaddr = 0;
266 kfree(mtk_gem->pages);
267}