Commit | Line | Data |
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b9d47450 SH |
1 | /* |
2 | * drm gem CMA (contiguous memory allocator) helper functions | |
3 | * | |
4 | * Copyright (C) 2012 Sascha Hauer, Pengutronix | |
5 | * | |
6 | * Based on Samsung Exynos code | |
7 | * | |
8 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version 2 | |
13 | * of the License, or (at your option) any later version. | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | */ | |
19 | ||
20 | #include <linux/mm.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/export.h> | |
71d7282a | 24 | #include <linux/dma-buf.h> |
b9d47450 SH |
25 | #include <linux/dma-mapping.h> |
26 | ||
27 | #include <drm/drmP.h> | |
28 | #include <drm/drm.h> | |
29 | #include <drm/drm_gem_cma_helper.h> | |
0de23977 | 30 | #include <drm/drm_vma_manager.h> |
b9d47450 | 31 | |
b9d47450 | 32 | /* |
a5ed8940 LP |
33 | * __drm_gem_cma_create - Create a GEM CMA object without allocating memory |
34 | * @drm: The drm device | |
35 | * @size: The GEM object size | |
b9d47450 | 36 | * |
a5ed8940 LP |
37 | * This function creates and initializes a GEM CMA object of the given size, but |
38 | * doesn't allocate any memory to back the object. | |
39 | * | |
40 | * Return a struct drm_gem_cma_object* on success or ERR_PTR values on failure. | |
b9d47450 | 41 | */ |
a5ed8940 LP |
42 | static struct drm_gem_cma_object * |
43 | __drm_gem_cma_create(struct drm_device *drm, unsigned int size) | |
b9d47450 SH |
44 | { |
45 | struct drm_gem_cma_object *cma_obj; | |
46 | struct drm_gem_object *gem_obj; | |
47 | int ret; | |
48 | ||
b9d47450 SH |
49 | cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL); |
50 | if (!cma_obj) | |
51 | return ERR_PTR(-ENOMEM); | |
52 | ||
b9d47450 SH |
53 | gem_obj = &cma_obj->base; |
54 | ||
55 | ret = drm_gem_object_init(drm, gem_obj, size); | |
56 | if (ret) | |
a5ed8940 | 57 | goto error; |
b9d47450 SH |
58 | |
59 | ret = drm_gem_create_mmap_offset(gem_obj); | |
a5ed8940 LP |
60 | if (ret) { |
61 | drm_gem_object_release(gem_obj); | |
62 | goto error; | |
63 | } | |
b9d47450 SH |
64 | |
65 | return cma_obj; | |
66 | ||
a5ed8940 LP |
67 | error: |
68 | kfree(cma_obj); | |
69 | return ERR_PTR(ret); | |
70 | } | |
b9d47450 | 71 | |
a5ed8940 LP |
72 | /* |
73 | * drm_gem_cma_create - allocate an object with the given size | |
74 | * | |
75 | * returns a struct drm_gem_cma_object* on success or ERR_PTR values | |
76 | * on failure. | |
77 | */ | |
78 | struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, | |
79 | unsigned int size) | |
80 | { | |
81 | struct drm_gem_cma_object *cma_obj; | |
71d7282a | 82 | int ret; |
b9d47450 | 83 | |
a5ed8940 | 84 | size = round_up(size, PAGE_SIZE); |
b9d47450 | 85 | |
a5ed8940 LP |
86 | cma_obj = __drm_gem_cma_create(drm, size); |
87 | if (IS_ERR(cma_obj)) | |
88 | return cma_obj; | |
89 | ||
90 | cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size, | |
91 | &cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN); | |
92 | if (!cma_obj->vaddr) { | |
93 | dev_err(drm->dev, "failed to allocate buffer with size %d\n", | |
94 | size); | |
71d7282a LP |
95 | ret = -ENOMEM; |
96 | goto error; | |
97 | } | |
98 | ||
a5ed8940 | 99 | return cma_obj; |
71d7282a LP |
100 | |
101 | error: | |
71d7282a LP |
102 | drm_gem_cma_free_object(&cma_obj->base); |
103 | return ERR_PTR(ret); | |
b9d47450 SH |
104 | } |
105 | EXPORT_SYMBOL_GPL(drm_gem_cma_create); | |
106 | ||
107 | /* | |
108 | * drm_gem_cma_create_with_handle - allocate an object with the given | |
109 | * size and create a gem handle on it | |
110 | * | |
111 | * returns a struct drm_gem_cma_object* on success or ERR_PTR values | |
112 | * on failure. | |
113 | */ | |
114 | static struct drm_gem_cma_object *drm_gem_cma_create_with_handle( | |
115 | struct drm_file *file_priv, | |
116 | struct drm_device *drm, unsigned int size, | |
117 | unsigned int *handle) | |
118 | { | |
119 | struct drm_gem_cma_object *cma_obj; | |
120 | struct drm_gem_object *gem_obj; | |
121 | int ret; | |
122 | ||
123 | cma_obj = drm_gem_cma_create(drm, size); | |
124 | if (IS_ERR(cma_obj)) | |
125 | return cma_obj; | |
126 | ||
127 | gem_obj = &cma_obj->base; | |
128 | ||
129 | /* | |
130 | * allocate a id of idr table where the obj is registered | |
131 | * and handle has the id what user can see. | |
132 | */ | |
133 | ret = drm_gem_handle_create(file_priv, gem_obj, handle); | |
134 | if (ret) | |
135 | goto err_handle_create; | |
136 | ||
137 | /* drop reference from allocate - handle holds it now. */ | |
138 | drm_gem_object_unreference_unlocked(gem_obj); | |
139 | ||
140 | return cma_obj; | |
141 | ||
142 | err_handle_create: | |
143 | drm_gem_cma_free_object(gem_obj); | |
144 | ||
145 | return ERR_PTR(ret); | |
146 | } | |
147 | ||
148 | /* | |
149 | * drm_gem_cma_free_object - (struct drm_driver)->gem_free_object callback | |
150 | * function | |
151 | */ | |
152 | void drm_gem_cma_free_object(struct drm_gem_object *gem_obj) | |
153 | { | |
154 | struct drm_gem_cma_object *cma_obj; | |
155 | ||
0de23977 | 156 | drm_gem_free_mmap_offset(gem_obj); |
b9d47450 | 157 | |
b9d47450 SH |
158 | cma_obj = to_drm_gem_cma_obj(gem_obj); |
159 | ||
71d7282a | 160 | if (cma_obj->vaddr) { |
a5ed8940 LP |
161 | dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size, |
162 | cma_obj->vaddr, cma_obj->paddr); | |
71d7282a LP |
163 | } else if (gem_obj->import_attach) { |
164 | drm_prime_gem_destroy(gem_obj, cma_obj->sgt); | |
165 | } | |
a5ed8940 LP |
166 | |
167 | drm_gem_object_release(gem_obj); | |
b9d47450 SH |
168 | |
169 | kfree(cma_obj); | |
170 | } | |
171 | EXPORT_SYMBOL_GPL(drm_gem_cma_free_object); | |
172 | ||
173 | /* | |
174 | * drm_gem_cma_dumb_create - (struct drm_driver)->dumb_create callback | |
175 | * function | |
176 | * | |
177 | * This aligns the pitch and size arguments to the minimum required. wrap | |
178 | * this into your own function if you need bigger alignment. | |
179 | */ | |
180 | int drm_gem_cma_dumb_create(struct drm_file *file_priv, | |
181 | struct drm_device *dev, struct drm_mode_create_dumb *args) | |
182 | { | |
183 | struct drm_gem_cma_object *cma_obj; | |
184 | int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); | |
185 | ||
186 | if (args->pitch < min_pitch) | |
187 | args->pitch = min_pitch; | |
188 | ||
189 | if (args->size < args->pitch * args->height) | |
190 | args->size = args->pitch * args->height; | |
191 | ||
192 | cma_obj = drm_gem_cma_create_with_handle(file_priv, dev, | |
193 | args->size, &args->handle); | |
b03cda51 | 194 | return PTR_ERR_OR_ZERO(cma_obj); |
b9d47450 SH |
195 | } |
196 | EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create); | |
197 | ||
198 | /* | |
199 | * drm_gem_cma_dumb_map_offset - (struct drm_driver)->dumb_map_offset callback | |
200 | * function | |
201 | */ | |
202 | int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv, | |
203 | struct drm_device *drm, uint32_t handle, uint64_t *offset) | |
204 | { | |
205 | struct drm_gem_object *gem_obj; | |
206 | ||
207 | mutex_lock(&drm->struct_mutex); | |
208 | ||
209 | gem_obj = drm_gem_object_lookup(drm, file_priv, handle); | |
210 | if (!gem_obj) { | |
211 | dev_err(drm->dev, "failed to lookup gem object\n"); | |
212 | mutex_unlock(&drm->struct_mutex); | |
213 | return -EINVAL; | |
214 | } | |
215 | ||
0de23977 | 216 | *offset = drm_vma_node_offset_addr(&gem_obj->vma_node); |
b9d47450 SH |
217 | |
218 | drm_gem_object_unreference(gem_obj); | |
219 | ||
220 | mutex_unlock(&drm->struct_mutex); | |
221 | ||
222 | return 0; | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset); | |
225 | ||
226 | const struct vm_operations_struct drm_gem_cma_vm_ops = { | |
227 | .open = drm_gem_vm_open, | |
228 | .close = drm_gem_vm_close, | |
229 | }; | |
230 | EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops); | |
231 | ||
ebaf9e03 LP |
232 | static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj, |
233 | struct vm_area_struct *vma) | |
234 | { | |
235 | int ret; | |
236 | ||
b65e64f7 LP |
237 | /* |
238 | * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the | |
239 | * vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map | |
240 | * the whole buffer. | |
241 | */ | |
242 | vma->vm_flags &= ~VM_PFNMAP; | |
243 | vma->vm_pgoff = 0; | |
244 | ||
245 | ret = dma_mmap_writecombine(cma_obj->base.dev->dev, vma, | |
246 | cma_obj->vaddr, cma_obj->paddr, | |
247 | vma->vm_end - vma->vm_start); | |
ebaf9e03 LP |
248 | if (ret) |
249 | drm_gem_vm_close(vma); | |
250 | ||
251 | return ret; | |
252 | } | |
253 | ||
b9d47450 SH |
254 | /* |
255 | * drm_gem_cma_mmap - (struct file_operation)->mmap callback function | |
256 | */ | |
257 | int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma) | |
258 | { | |
b9d47450 | 259 | struct drm_gem_cma_object *cma_obj; |
ebaf9e03 | 260 | struct drm_gem_object *gem_obj; |
b9d47450 SH |
261 | int ret; |
262 | ||
263 | ret = drm_gem_mmap(filp, vma); | |
264 | if (ret) | |
265 | return ret; | |
266 | ||
267 | gem_obj = vma->vm_private_data; | |
268 | cma_obj = to_drm_gem_cma_obj(gem_obj); | |
269 | ||
ebaf9e03 | 270 | return drm_gem_cma_mmap_obj(cma_obj, vma); |
b9d47450 SH |
271 | } |
272 | EXPORT_SYMBOL_GPL(drm_gem_cma_mmap); | |
273 | ||
6f646095 RC |
274 | #ifdef CONFIG_DEBUG_FS |
275 | void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m) | |
276 | { | |
277 | struct drm_gem_object *obj = &cma_obj->base; | |
278 | struct drm_device *dev = obj->dev; | |
0de23977 | 279 | uint64_t off; |
6f646095 RC |
280 | |
281 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); | |
282 | ||
0de23977 | 283 | off = drm_vma_node_start(&obj->vma_node); |
6f646095 RC |
284 | |
285 | seq_printf(m, "%2d (%2d) %08llx %08Zx %p %d", | |
286 | obj->name, obj->refcount.refcount.counter, | |
287 | off, cma_obj->paddr, cma_obj->vaddr, obj->size); | |
288 | ||
289 | seq_printf(m, "\n"); | |
290 | } | |
291 | EXPORT_SYMBOL_GPL(drm_gem_cma_describe); | |
292 | #endif | |
71d7282a | 293 | |
78467dc5 JS |
294 | /* low-level interface prime helpers */ |
295 | struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj) | |
296 | { | |
297 | struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj); | |
298 | struct sg_table *sgt; | |
299 | int ret; | |
300 | ||
301 | sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); | |
302 | if (!sgt) | |
303 | return NULL; | |
304 | ||
305 | ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr, | |
306 | cma_obj->paddr, obj->size); | |
307 | if (ret < 0) | |
308 | goto out; | |
309 | ||
310 | return sgt; | |
311 | ||
312 | out: | |
313 | kfree(sgt); | |
314 | return NULL; | |
315 | } | |
316 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table); | |
317 | ||
318 | struct drm_gem_object * | |
319 | drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size, | |
320 | struct sg_table *sgt) | |
321 | { | |
322 | struct drm_gem_cma_object *cma_obj; | |
323 | ||
324 | if (sgt->nents != 1) | |
325 | return ERR_PTR(-EINVAL); | |
326 | ||
327 | /* Create a CMA GEM buffer. */ | |
328 | cma_obj = __drm_gem_cma_create(dev, size); | |
329 | if (IS_ERR(cma_obj)) | |
330 | return ERR_PTR(PTR_ERR(cma_obj)); | |
331 | ||
332 | cma_obj->paddr = sg_dma_address(sgt->sgl); | |
333 | cma_obj->sgt = sgt; | |
334 | ||
335 | DRM_DEBUG_PRIME("dma_addr = 0x%x, size = %zu\n", cma_obj->paddr, size); | |
336 | ||
337 | return &cma_obj->base; | |
338 | } | |
339 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table); | |
340 | ||
341 | int drm_gem_cma_prime_mmap(struct drm_gem_object *obj, | |
342 | struct vm_area_struct *vma) | |
343 | { | |
344 | struct drm_gem_cma_object *cma_obj; | |
345 | struct drm_device *dev = obj->dev; | |
346 | int ret; | |
347 | ||
348 | mutex_lock(&dev->struct_mutex); | |
349 | ret = drm_gem_mmap_obj(obj, obj->size, vma); | |
350 | mutex_unlock(&dev->struct_mutex); | |
351 | if (ret < 0) | |
352 | return ret; | |
353 | ||
354 | cma_obj = to_drm_gem_cma_obj(obj); | |
355 | return drm_gem_cma_mmap_obj(cma_obj, vma); | |
356 | } | |
357 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap); | |
358 | ||
359 | void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj) | |
360 | { | |
361 | struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj); | |
362 | ||
363 | return cma_obj->vaddr; | |
364 | } | |
365 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap); | |
366 | ||
367 | void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr) | |
368 | { | |
369 | /* Nothing to do */ | |
370 | } | |
371 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap); |