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1/*
2 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3 * Author:Mark Yao <mark.yao@rock-chips.com>
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <drm/drm.h>
16#include <drm/drmP.h>
17#include <drm/drm_gem.h>
18#include <drm/drm_vma_manager.h>
19
20#include <linux/dma-attrs.h>
21
22#include "rockchip_drm_drv.h"
23#include "rockchip_drm_gem.h"
24
25static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
26 bool alloc_kmap)
27{
28 struct drm_gem_object *obj = &rk_obj->base;
29 struct drm_device *drm = obj->dev;
30
31 init_dma_attrs(&rk_obj->dma_attrs);
32 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
33
34 if (!alloc_kmap)
35 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);
36
37 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
38 &rk_obj->dma_addr, GFP_KERNEL,
39 &rk_obj->dma_attrs);
40 if (!rk_obj->kvaddr) {
41 DRM_ERROR("failed to allocate %#x byte dma buffer", obj->size);
42 return -ENOMEM;
43 }
44
45 return 0;
46}
47
48static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
49{
50 struct drm_gem_object *obj = &rk_obj->base;
51 struct drm_device *drm = obj->dev;
52
53 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
54 &rk_obj->dma_attrs);
55}
56
57static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
58 struct vm_area_struct *vma)
59
60{
61 int ret;
62 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
63 struct drm_device *drm = obj->dev;
64
65 /*
66 * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
67 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
68 */
69 vma->vm_flags &= ~VM_PFNMAP;
70 vma->vm_pgoff = 0;
71
72 ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
73 obj->size, &rk_obj->dma_attrs);
74 if (ret)
75 drm_gem_vm_close(vma);
76
77 return ret;
78}
79
80int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
81 struct vm_area_struct *vma)
82{
83 int ret;
84
85 ret = drm_gem_mmap_obj(obj, obj->size, vma);
86 if (ret)
87 return ret;
88
89 return rockchip_drm_gem_object_mmap(obj, vma);
90}
91
92/* drm driver mmap file operations */
93int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
94{
95 struct drm_gem_object *obj;
96 int ret;
97
98 ret = drm_gem_mmap(filp, vma);
99 if (ret)
100 return ret;
101
102 obj = vma->vm_private_data;
103
104 return rockchip_drm_gem_object_mmap(obj, vma);
105}
106
107struct rockchip_gem_object *
108 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
109 bool alloc_kmap)
110{
111 struct rockchip_gem_object *rk_obj;
112 struct drm_gem_object *obj;
113 int ret;
114
115 size = round_up(size, PAGE_SIZE);
116
117 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
118 if (!rk_obj)
119 return ERR_PTR(-ENOMEM);
120
121 obj = &rk_obj->base;
122
123 drm_gem_private_object_init(drm, obj, size);
124
125 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
126 if (ret)
127 goto err_free_rk_obj;
128
129 return rk_obj;
130
131err_free_rk_obj:
132 kfree(rk_obj);
133 return ERR_PTR(ret);
134}
135
136/*
137 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
138 * function
139 */
140void rockchip_gem_free_object(struct drm_gem_object *obj)
141{
142 struct rockchip_gem_object *rk_obj;
143
144 drm_gem_free_mmap_offset(obj);
145
146 rk_obj = to_rockchip_obj(obj);
147
148 rockchip_gem_free_buf(rk_obj);
149
150 kfree(rk_obj);
151}
152
153/*
154 * rockchip_gem_create_with_handle - allocate an object with the given
155 * size and create a gem handle on it
156 *
157 * returns a struct rockchip_gem_object* on success or ERR_PTR values
158 * on failure.
159 */
160static struct rockchip_gem_object *
161rockchip_gem_create_with_handle(struct drm_file *file_priv,
162 struct drm_device *drm, unsigned int size,
163 unsigned int *handle)
164{
165 struct rockchip_gem_object *rk_obj;
166 struct drm_gem_object *obj;
167 int ret;
168
169 rk_obj = rockchip_gem_create_object(drm, size, false);
170 if (IS_ERR(rk_obj))
171 return ERR_CAST(rk_obj);
172
173 obj = &rk_obj->base;
174
175 /*
176 * allocate a id of idr table where the obj is registered
177 * and handle has the id what user can see.
178 */
179 ret = drm_gem_handle_create(file_priv, obj, handle);
180 if (ret)
181 goto err_handle_create;
182
183 /* drop reference from allocate - handle holds it now. */
184 drm_gem_object_unreference_unlocked(obj);
185
186 return rk_obj;
187
188err_handle_create:
189 rockchip_gem_free_object(obj);
190
191 return ERR_PTR(ret);
192}
193
194int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
195 struct drm_device *dev, uint32_t handle,
196 uint64_t *offset)
197{
198 struct drm_gem_object *obj;
199 int ret;
200
201 obj = drm_gem_object_lookup(dev, file_priv, handle);
202 if (!obj) {
203 DRM_ERROR("failed to lookup gem object.\n");
204 return -EINVAL;
205 }
206
207 ret = drm_gem_create_mmap_offset(obj);
208 if (ret)
209 goto out;
210
211 *offset = drm_vma_node_offset_addr(&obj->vma_node);
212 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
213
214out:
215 drm_gem_object_unreference_unlocked(obj);
216
217 return 0;
218}
219
220/*
221 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
222 * function
223 *
224 * This aligns the pitch and size arguments to the minimum required. wrap
225 * this into your own function if you need bigger alignment.
226 */
227int rockchip_gem_dumb_create(struct drm_file *file_priv,
228 struct drm_device *dev,
229 struct drm_mode_create_dumb *args)
230{
231 struct rockchip_gem_object *rk_obj;
232 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
233
234 /*
235 * align to 64 bytes since Mali requires it.
236 */
237 args->pitch = ALIGN(min_pitch, 64);
238 args->size = args->pitch * args->height;
239
240 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
241 &args->handle);
242
243 return PTR_ERR_OR_ZERO(rk_obj);
244}
245
246/*
247 * Allocate a sg_table for this GEM object.
248 * Note: Both the table's contents, and the sg_table itself must be freed by
249 * the caller.
250 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
251 */
252struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
253{
254 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
255 struct drm_device *drm = obj->dev;
256 struct sg_table *sgt;
257 int ret;
258
259 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
260 if (!sgt)
261 return ERR_PTR(-ENOMEM);
262
263 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
264 rk_obj->dma_addr, obj->size,
265 &rk_obj->dma_attrs);
266 if (ret) {
267 DRM_ERROR("failed to allocate sgt, %d\n", ret);
268 kfree(sgt);
269 return ERR_PTR(ret);
270 }
271
272 return sgt;
273}
274
275void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
276{
277 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
278
279 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
280 return NULL;
281
282 return rk_obj->kvaddr;
283}
284
285void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
286{
287 /* Nothing to do */
288}
1/*
2 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3 * Author:Mark Yao <mark.yao@rock-chips.com>
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <drm/drm.h>
16#include <drm/drmP.h>
17#include <drm/drm_gem.h>
18#include <drm/drm_vma_manager.h>
19
20#include "rockchip_drm_drv.h"
21#include "rockchip_drm_gem.h"
22
23static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
24 bool alloc_kmap)
25{
26 struct drm_gem_object *obj = &rk_obj->base;
27 struct drm_device *drm = obj->dev;
28
29 rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
30
31 if (!alloc_kmap)
32 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
33
34 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
35 &rk_obj->dma_addr, GFP_KERNEL,
36 rk_obj->dma_attrs);
37 if (!rk_obj->kvaddr) {
38 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
39 return -ENOMEM;
40 }
41
42 return 0;
43}
44
45static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
46{
47 struct drm_gem_object *obj = &rk_obj->base;
48 struct drm_device *drm = obj->dev;
49
50 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
51 rk_obj->dma_attrs);
52}
53
54static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
55 struct vm_area_struct *vma)
56
57{
58 int ret;
59 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
60 struct drm_device *drm = obj->dev;
61
62 /*
63 * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
64 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
65 */
66 vma->vm_flags &= ~VM_PFNMAP;
67 vma->vm_pgoff = 0;
68
69 ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
70 obj->size, rk_obj->dma_attrs);
71 if (ret)
72 drm_gem_vm_close(vma);
73
74 return ret;
75}
76
77int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
78 struct vm_area_struct *vma)
79{
80 int ret;
81
82 ret = drm_gem_mmap_obj(obj, obj->size, vma);
83 if (ret)
84 return ret;
85
86 return rockchip_drm_gem_object_mmap(obj, vma);
87}
88
89/* drm driver mmap file operations */
90int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
91{
92 struct drm_gem_object *obj;
93 int ret;
94
95 ret = drm_gem_mmap(filp, vma);
96 if (ret)
97 return ret;
98
99 obj = vma->vm_private_data;
100
101 return rockchip_drm_gem_object_mmap(obj, vma);
102}
103
104struct rockchip_gem_object *
105 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
106 bool alloc_kmap)
107{
108 struct rockchip_gem_object *rk_obj;
109 struct drm_gem_object *obj;
110 int ret;
111
112 size = round_up(size, PAGE_SIZE);
113
114 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
115 if (!rk_obj)
116 return ERR_PTR(-ENOMEM);
117
118 obj = &rk_obj->base;
119
120 drm_gem_private_object_init(drm, obj, size);
121
122 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
123 if (ret)
124 goto err_free_rk_obj;
125
126 return rk_obj;
127
128err_free_rk_obj:
129 kfree(rk_obj);
130 return ERR_PTR(ret);
131}
132
133/*
134 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
135 * function
136 */
137void rockchip_gem_free_object(struct drm_gem_object *obj)
138{
139 struct rockchip_gem_object *rk_obj;
140
141 drm_gem_free_mmap_offset(obj);
142
143 rk_obj = to_rockchip_obj(obj);
144
145 rockchip_gem_free_buf(rk_obj);
146
147 kfree(rk_obj);
148}
149
150/*
151 * rockchip_gem_create_with_handle - allocate an object with the given
152 * size and create a gem handle on it
153 *
154 * returns a struct rockchip_gem_object* on success or ERR_PTR values
155 * on failure.
156 */
157static struct rockchip_gem_object *
158rockchip_gem_create_with_handle(struct drm_file *file_priv,
159 struct drm_device *drm, unsigned int size,
160 unsigned int *handle)
161{
162 struct rockchip_gem_object *rk_obj;
163 struct drm_gem_object *obj;
164 int ret;
165
166 rk_obj = rockchip_gem_create_object(drm, size, false);
167 if (IS_ERR(rk_obj))
168 return ERR_CAST(rk_obj);
169
170 obj = &rk_obj->base;
171
172 /*
173 * allocate a id of idr table where the obj is registered
174 * and handle has the id what user can see.
175 */
176 ret = drm_gem_handle_create(file_priv, obj, handle);
177 if (ret)
178 goto err_handle_create;
179
180 /* drop reference from allocate - handle holds it now. */
181 drm_gem_object_unreference_unlocked(obj);
182
183 return rk_obj;
184
185err_handle_create:
186 rockchip_gem_free_object(obj);
187
188 return ERR_PTR(ret);
189}
190
191int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
192 struct drm_device *dev, uint32_t handle,
193 uint64_t *offset)
194{
195 struct drm_gem_object *obj;
196 int ret;
197
198 obj = drm_gem_object_lookup(file_priv, handle);
199 if (!obj) {
200 DRM_ERROR("failed to lookup gem object.\n");
201 return -EINVAL;
202 }
203
204 ret = drm_gem_create_mmap_offset(obj);
205 if (ret)
206 goto out;
207
208 *offset = drm_vma_node_offset_addr(&obj->vma_node);
209 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
210
211out:
212 drm_gem_object_unreference_unlocked(obj);
213
214 return 0;
215}
216
217/*
218 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
219 * function
220 *
221 * This aligns the pitch and size arguments to the minimum required. wrap
222 * this into your own function if you need bigger alignment.
223 */
224int rockchip_gem_dumb_create(struct drm_file *file_priv,
225 struct drm_device *dev,
226 struct drm_mode_create_dumb *args)
227{
228 struct rockchip_gem_object *rk_obj;
229 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
230
231 /*
232 * align to 64 bytes since Mali requires it.
233 */
234 args->pitch = ALIGN(min_pitch, 64);
235 args->size = args->pitch * args->height;
236
237 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
238 &args->handle);
239
240 return PTR_ERR_OR_ZERO(rk_obj);
241}
242
243/*
244 * Allocate a sg_table for this GEM object.
245 * Note: Both the table's contents, and the sg_table itself must be freed by
246 * the caller.
247 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
248 */
249struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
250{
251 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
252 struct drm_device *drm = obj->dev;
253 struct sg_table *sgt;
254 int ret;
255
256 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
257 if (!sgt)
258 return ERR_PTR(-ENOMEM);
259
260 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
261 rk_obj->dma_addr, obj->size,
262 rk_obj->dma_attrs);
263 if (ret) {
264 DRM_ERROR("failed to allocate sgt, %d\n", ret);
265 kfree(sgt);
266 return ERR_PTR(ret);
267 }
268
269 return sgt;
270}
271
272void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
273{
274 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
275
276 if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
277 return NULL;
278
279 return rk_obj->kvaddr;
280}
281
282void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
283{
284 /* Nothing to do */
285}