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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_prime.h>
12
13#include "mtk_drm_drv.h"
14#include "mtk_drm_gem.h"
15
16static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
17 unsigned long size)
18{
19 struct mtk_drm_gem_obj *mtk_gem_obj;
20 int ret;
21
22 size = round_up(size, PAGE_SIZE);
23
24 mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
25 if (!mtk_gem_obj)
26 return ERR_PTR(-ENOMEM);
27
28 ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
29 if (ret < 0) {
30 DRM_ERROR("failed to initialize gem object\n");
31 kfree(mtk_gem_obj);
32 return ERR_PTR(ret);
33 }
34
35 return mtk_gem_obj;
36}
37
38struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
39 size_t size, bool alloc_kmap)
40{
41 struct mtk_drm_private *priv = dev->dev_private;
42 struct mtk_drm_gem_obj *mtk_gem;
43 struct drm_gem_object *obj;
44 int ret;
45
46 mtk_gem = mtk_drm_gem_init(dev, size);
47 if (IS_ERR(mtk_gem))
48 return ERR_CAST(mtk_gem);
49
50 obj = &mtk_gem->base;
51
52 mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
53
54 if (!alloc_kmap)
55 mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
56
57 mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
58 &mtk_gem->dma_addr, GFP_KERNEL,
59 mtk_gem->dma_attrs);
60 if (!mtk_gem->cookie) {
61 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
62 ret = -ENOMEM;
63 goto err_gem_free;
64 }
65
66 if (alloc_kmap)
67 mtk_gem->kvaddr = mtk_gem->cookie;
68
69 DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
70 mtk_gem->cookie, &mtk_gem->dma_addr,
71 size);
72
73 return mtk_gem;
74
75err_gem_free:
76 drm_gem_object_release(obj);
77 kfree(mtk_gem);
78 return ERR_PTR(ret);
79}
80
81void mtk_drm_gem_free_object(struct drm_gem_object *obj)
82{
83 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
84 struct mtk_drm_private *priv = obj->dev->dev_private;
85
86 if (mtk_gem->sg)
87 drm_prime_gem_destroy(obj, mtk_gem->sg);
88 else
89 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
90 mtk_gem->dma_addr, mtk_gem->dma_attrs);
91
92 /* release file pointer to gem object. */
93 drm_gem_object_release(obj);
94
95 kfree(mtk_gem);
96}
97
98int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
99 struct drm_mode_create_dumb *args)
100{
101 struct mtk_drm_gem_obj *mtk_gem;
102 int ret;
103
104 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
105 args->size = args->pitch * args->height;
106
107 mtk_gem = mtk_drm_gem_create(dev, args->size, false);
108 if (IS_ERR(mtk_gem))
109 return PTR_ERR(mtk_gem);
110
111 /*
112 * allocate a id of idr table where the obj is registered
113 * and handle has the id what user can see.
114 */
115 ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
116 if (ret)
117 goto err_handle_create;
118
119 /* drop reference from allocate - handle holds it now. */
120 drm_gem_object_put(&mtk_gem->base);
121
122 return 0;
123
124err_handle_create:
125 mtk_drm_gem_free_object(&mtk_gem->base);
126 return ret;
127}
128
129static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
130 struct vm_area_struct *vma)
131
132{
133 int ret;
134 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
135 struct mtk_drm_private *priv = obj->dev->dev_private;
136
137 /*
138 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
139 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
140 */
141 vma->vm_flags &= ~VM_PFNMAP;
142
143 ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
144 mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
145 if (ret)
146 drm_gem_vm_close(vma);
147
148 return ret;
149}
150
151int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
152{
153 int ret;
154
155 ret = drm_gem_mmap_obj(obj, obj->size, vma);
156 if (ret)
157 return ret;
158
159 return mtk_drm_gem_object_mmap(obj, vma);
160}
161
162int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
163{
164 struct drm_gem_object *obj;
165 int ret;
166
167 ret = drm_gem_mmap(filp, vma);
168 if (ret)
169 return ret;
170
171 obj = vma->vm_private_data;
172
173 /*
174 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
175 * whole buffer from the start.
176 */
177 vma->vm_pgoff = 0;
178
179 return mtk_drm_gem_object_mmap(obj, vma);
180}
181
182/*
183 * Allocate a sg_table for this GEM object.
184 * Note: Both the table's contents, and the sg_table itself must be freed by
185 * the caller.
186 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
187 */
188struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
189{
190 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
191 struct mtk_drm_private *priv = obj->dev->dev_private;
192 struct sg_table *sgt;
193 int ret;
194
195 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
196 if (!sgt)
197 return ERR_PTR(-ENOMEM);
198
199 ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
200 mtk_gem->dma_addr, obj->size,
201 mtk_gem->dma_attrs);
202 if (ret) {
203 DRM_ERROR("failed to allocate sgt, %d\n", ret);
204 kfree(sgt);
205 return ERR_PTR(ret);
206 }
207
208 return sgt;
209}
210
211struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
212 struct dma_buf_attachment *attach, struct sg_table *sg)
213{
214 struct mtk_drm_gem_obj *mtk_gem;
215 int ret;
216 struct scatterlist *s;
217 unsigned int i;
218 dma_addr_t expected;
219
220 mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
221
222 if (IS_ERR(mtk_gem))
223 return ERR_CAST(mtk_gem);
224
225 expected = sg_dma_address(sg->sgl);
226 for_each_sg(sg->sgl, s, sg->nents, i) {
227 if (!sg_dma_len(s))
228 break;
229
230 if (sg_dma_address(s) != expected) {
231 DRM_ERROR("sg_table is not contiguous");
232 ret = -EINVAL;
233 goto err_gem_free;
234 }
235 expected = sg_dma_address(s) + sg_dma_len(s);
236 }
237
238 mtk_gem->dma_addr = sg_dma_address(sg->sgl);
239 mtk_gem->sg = sg;
240
241 return &mtk_gem->base;
242
243err_gem_free:
244 kfree(mtk_gem);
245 return ERR_PTR(ret);
246}
247
248void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj)
249{
250 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
251 struct sg_table *sgt;
252 struct sg_page_iter iter;
253 unsigned int npages;
254 unsigned int i = 0;
255
256 if (mtk_gem->kvaddr)
257 return mtk_gem->kvaddr;
258
259 sgt = mtk_gem_prime_get_sg_table(obj);
260 if (IS_ERR(sgt))
261 return NULL;
262
263 npages = obj->size >> PAGE_SHIFT;
264 mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
265 if (!mtk_gem->pages)
266 goto out;
267
268 for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
269 mtk_gem->pages[i++] = sg_page_iter_page(&iter);
270 if (i > npages)
271 break;
272 }
273 mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
274 pgprot_writecombine(PAGE_KERNEL));
275
276out:
277 kfree(sgt);
278
279 return mtk_gem->kvaddr;
280}
281
282void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
283{
284 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
285
286 if (!mtk_gem->pages)
287 return;
288
289 vunmap(vaddr);
290 mtk_gem->kvaddr = 0;
291 kfree(mtk_gem->pages);
292}
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_cma_helper.h>
12#include <drm/drm_prime.h>
13
14#include "mtk_drm_drv.h"
15#include "mtk_drm_gem.h"
16
17static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
18 .free = mtk_drm_gem_free_object,
19 .get_sg_table = mtk_gem_prime_get_sg_table,
20 .vmap = mtk_drm_gem_prime_vmap,
21 .vunmap = mtk_drm_gem_prime_vunmap,
22 .vm_ops = &drm_gem_cma_vm_ops,
23};
24
25static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
26 unsigned long size)
27{
28 struct mtk_drm_gem_obj *mtk_gem_obj;
29 int ret;
30
31 size = round_up(size, PAGE_SIZE);
32
33 mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
34 if (!mtk_gem_obj)
35 return ERR_PTR(-ENOMEM);
36
37 mtk_gem_obj->base.funcs = &mtk_drm_gem_object_funcs;
38
39 ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
40 if (ret < 0) {
41 DRM_ERROR("failed to initialize gem object\n");
42 kfree(mtk_gem_obj);
43 return ERR_PTR(ret);
44 }
45
46 return mtk_gem_obj;
47}
48
49struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
50 size_t size, bool alloc_kmap)
51{
52 struct mtk_drm_private *priv = dev->dev_private;
53 struct mtk_drm_gem_obj *mtk_gem;
54 struct drm_gem_object *obj;
55 int ret;
56
57 mtk_gem = mtk_drm_gem_init(dev, size);
58 if (IS_ERR(mtk_gem))
59 return ERR_CAST(mtk_gem);
60
61 obj = &mtk_gem->base;
62
63 mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
64
65 if (!alloc_kmap)
66 mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
67
68 mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
69 &mtk_gem->dma_addr, GFP_KERNEL,
70 mtk_gem->dma_attrs);
71 if (!mtk_gem->cookie) {
72 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
73 ret = -ENOMEM;
74 goto err_gem_free;
75 }
76
77 if (alloc_kmap)
78 mtk_gem->kvaddr = mtk_gem->cookie;
79
80 DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
81 mtk_gem->cookie, &mtk_gem->dma_addr,
82 size);
83
84 return mtk_gem;
85
86err_gem_free:
87 drm_gem_object_release(obj);
88 kfree(mtk_gem);
89 return ERR_PTR(ret);
90}
91
92void mtk_drm_gem_free_object(struct drm_gem_object *obj)
93{
94 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
95 struct mtk_drm_private *priv = obj->dev->dev_private;
96
97 if (mtk_gem->sg)
98 drm_prime_gem_destroy(obj, mtk_gem->sg);
99 else
100 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
101 mtk_gem->dma_addr, mtk_gem->dma_attrs);
102
103 /* release file pointer to gem object. */
104 drm_gem_object_release(obj);
105
106 kfree(mtk_gem);
107}
108
109int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
110 struct drm_mode_create_dumb *args)
111{
112 struct mtk_drm_gem_obj *mtk_gem;
113 int ret;
114
115 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
116 args->size = args->pitch * args->height;
117
118 mtk_gem = mtk_drm_gem_create(dev, args->size, false);
119 if (IS_ERR(mtk_gem))
120 return PTR_ERR(mtk_gem);
121
122 /*
123 * allocate a id of idr table where the obj is registered
124 * and handle has the id what user can see.
125 */
126 ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
127 if (ret)
128 goto err_handle_create;
129
130 /* drop reference from allocate - handle holds it now. */
131 drm_gem_object_put(&mtk_gem->base);
132
133 return 0;
134
135err_handle_create:
136 mtk_drm_gem_free_object(&mtk_gem->base);
137 return ret;
138}
139
140static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
141 struct vm_area_struct *vma)
142
143{
144 int ret;
145 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
146 struct mtk_drm_private *priv = obj->dev->dev_private;
147
148 /*
149 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
150 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
151 */
152 vma->vm_flags &= ~VM_PFNMAP;
153
154 ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
155 mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
156 if (ret)
157 drm_gem_vm_close(vma);
158
159 return ret;
160}
161
162int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
163{
164 int ret;
165
166 ret = drm_gem_mmap_obj(obj, obj->size, vma);
167 if (ret)
168 return ret;
169
170 return mtk_drm_gem_object_mmap(obj, vma);
171}
172
173int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
174{
175 struct drm_gem_object *obj;
176 int ret;
177
178 ret = drm_gem_mmap(filp, vma);
179 if (ret)
180 return ret;
181
182 obj = vma->vm_private_data;
183
184 /*
185 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
186 * whole buffer from the start.
187 */
188 vma->vm_pgoff = 0;
189
190 return mtk_drm_gem_object_mmap(obj, vma);
191}
192
193/*
194 * Allocate a sg_table for this GEM object.
195 * Note: Both the table's contents, and the sg_table itself must be freed by
196 * the caller.
197 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
198 */
199struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
200{
201 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
202 struct mtk_drm_private *priv = obj->dev->dev_private;
203 struct sg_table *sgt;
204 int ret;
205
206 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
207 if (!sgt)
208 return ERR_PTR(-ENOMEM);
209
210 ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
211 mtk_gem->dma_addr, obj->size,
212 mtk_gem->dma_attrs);
213 if (ret) {
214 DRM_ERROR("failed to allocate sgt, %d\n", ret);
215 kfree(sgt);
216 return ERR_PTR(ret);
217 }
218
219 return sgt;
220}
221
222struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
223 struct dma_buf_attachment *attach, struct sg_table *sg)
224{
225 struct mtk_drm_gem_obj *mtk_gem;
226
227 /* check if the entries in the sg_table are contiguous */
228 if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
229 DRM_ERROR("sg_table is not contiguous");
230 return ERR_PTR(-EINVAL);
231 }
232
233 mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
234 if (IS_ERR(mtk_gem))
235 return ERR_CAST(mtk_gem);
236
237 mtk_gem->dma_addr = sg_dma_address(sg->sgl);
238 mtk_gem->sg = sg;
239
240 return &mtk_gem->base;
241}
242
243int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct dma_buf_map *map)
244{
245 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
246 struct sg_table *sgt = NULL;
247 unsigned int npages;
248
249 if (mtk_gem->kvaddr)
250 goto out;
251
252 sgt = mtk_gem_prime_get_sg_table(obj);
253 if (IS_ERR(sgt))
254 return PTR_ERR(sgt);
255
256 npages = obj->size >> PAGE_SHIFT;
257 mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
258 if (!mtk_gem->pages) {
259 kfree(sgt);
260 return -ENOMEM;
261 }
262
263 drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);
264
265 mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
266 pgprot_writecombine(PAGE_KERNEL));
267
268out:
269 kfree(sgt);
270 dma_buf_map_set_vaddr(map, mtk_gem->kvaddr);
271
272 return 0;
273}
274
275void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map)
276{
277 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
278 void *vaddr = map->vaddr;
279
280 if (!mtk_gem->pages)
281 return;
282
283 vunmap(vaddr);
284 mtk_gem->kvaddr = 0;
285 kfree(mtk_gem->pages);
286}