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 LP |
82 | struct sg_table *sgt = NULL; |
83 | int ret; | |
b9d47450 | 84 | |
a5ed8940 | 85 | size = round_up(size, PAGE_SIZE); |
b9d47450 | 86 | |
a5ed8940 LP |
87 | cma_obj = __drm_gem_cma_create(drm, size); |
88 | if (IS_ERR(cma_obj)) | |
89 | return cma_obj; | |
90 | ||
91 | cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size, | |
92 | &cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN); | |
93 | if (!cma_obj->vaddr) { | |
94 | dev_err(drm->dev, "failed to allocate buffer with size %d\n", | |
95 | size); | |
71d7282a LP |
96 | ret = -ENOMEM; |
97 | goto error; | |
98 | } | |
99 | ||
100 | sgt = kzalloc(sizeof(*cma_obj->sgt), GFP_KERNEL); | |
101 | if (sgt == NULL) { | |
102 | ret = -ENOMEM; | |
103 | goto error; | |
a5ed8940 LP |
104 | } |
105 | ||
71d7282a LP |
106 | ret = dma_get_sgtable(drm->dev, sgt, cma_obj->vaddr, |
107 | cma_obj->paddr, size); | |
108 | if (ret < 0) | |
109 | goto error; | |
110 | ||
111 | cma_obj->sgt = sgt; | |
112 | ||
a5ed8940 | 113 | return cma_obj; |
71d7282a LP |
114 | |
115 | error: | |
116 | kfree(sgt); | |
117 | drm_gem_cma_free_object(&cma_obj->base); | |
118 | return ERR_PTR(ret); | |
b9d47450 SH |
119 | } |
120 | EXPORT_SYMBOL_GPL(drm_gem_cma_create); | |
121 | ||
122 | /* | |
123 | * drm_gem_cma_create_with_handle - allocate an object with the given | |
124 | * size and create a gem handle on it | |
125 | * | |
126 | * returns a struct drm_gem_cma_object* on success or ERR_PTR values | |
127 | * on failure. | |
128 | */ | |
129 | static struct drm_gem_cma_object *drm_gem_cma_create_with_handle( | |
130 | struct drm_file *file_priv, | |
131 | struct drm_device *drm, unsigned int size, | |
132 | unsigned int *handle) | |
133 | { | |
134 | struct drm_gem_cma_object *cma_obj; | |
135 | struct drm_gem_object *gem_obj; | |
136 | int ret; | |
137 | ||
138 | cma_obj = drm_gem_cma_create(drm, size); | |
139 | if (IS_ERR(cma_obj)) | |
140 | return cma_obj; | |
141 | ||
142 | gem_obj = &cma_obj->base; | |
143 | ||
144 | /* | |
145 | * allocate a id of idr table where the obj is registered | |
146 | * and handle has the id what user can see. | |
147 | */ | |
148 | ret = drm_gem_handle_create(file_priv, gem_obj, handle); | |
149 | if (ret) | |
150 | goto err_handle_create; | |
151 | ||
152 | /* drop reference from allocate - handle holds it now. */ | |
153 | drm_gem_object_unreference_unlocked(gem_obj); | |
154 | ||
155 | return cma_obj; | |
156 | ||
157 | err_handle_create: | |
158 | drm_gem_cma_free_object(gem_obj); | |
159 | ||
160 | return ERR_PTR(ret); | |
161 | } | |
162 | ||
163 | /* | |
164 | * drm_gem_cma_free_object - (struct drm_driver)->gem_free_object callback | |
165 | * function | |
166 | */ | |
167 | void drm_gem_cma_free_object(struct drm_gem_object *gem_obj) | |
168 | { | |
169 | struct drm_gem_cma_object *cma_obj; | |
170 | ||
0de23977 | 171 | drm_gem_free_mmap_offset(gem_obj); |
b9d47450 | 172 | |
b9d47450 SH |
173 | cma_obj = to_drm_gem_cma_obj(gem_obj); |
174 | ||
71d7282a | 175 | if (cma_obj->vaddr) { |
a5ed8940 LP |
176 | dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size, |
177 | cma_obj->vaddr, cma_obj->paddr); | |
71d7282a LP |
178 | if (cma_obj->sgt) { |
179 | sg_free_table(cma_obj->sgt); | |
180 | kfree(cma_obj->sgt); | |
181 | } | |
182 | } else if (gem_obj->import_attach) { | |
183 | drm_prime_gem_destroy(gem_obj, cma_obj->sgt); | |
184 | } | |
a5ed8940 LP |
185 | |
186 | drm_gem_object_release(gem_obj); | |
b9d47450 SH |
187 | |
188 | kfree(cma_obj); | |
189 | } | |
190 | EXPORT_SYMBOL_GPL(drm_gem_cma_free_object); | |
191 | ||
192 | /* | |
193 | * drm_gem_cma_dumb_create - (struct drm_driver)->dumb_create callback | |
194 | * function | |
195 | * | |
196 | * This aligns the pitch and size arguments to the minimum required. wrap | |
197 | * this into your own function if you need bigger alignment. | |
198 | */ | |
199 | int drm_gem_cma_dumb_create(struct drm_file *file_priv, | |
200 | struct drm_device *dev, struct drm_mode_create_dumb *args) | |
201 | { | |
202 | struct drm_gem_cma_object *cma_obj; | |
203 | int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); | |
204 | ||
205 | if (args->pitch < min_pitch) | |
206 | args->pitch = min_pitch; | |
207 | ||
208 | if (args->size < args->pitch * args->height) | |
209 | args->size = args->pitch * args->height; | |
210 | ||
211 | cma_obj = drm_gem_cma_create_with_handle(file_priv, dev, | |
212 | args->size, &args->handle); | |
f6fb754d | 213 | return PTR_RET(cma_obj); |
b9d47450 SH |
214 | } |
215 | EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create); | |
216 | ||
217 | /* | |
218 | * drm_gem_cma_dumb_map_offset - (struct drm_driver)->dumb_map_offset callback | |
219 | * function | |
220 | */ | |
221 | int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv, | |
222 | struct drm_device *drm, uint32_t handle, uint64_t *offset) | |
223 | { | |
224 | struct drm_gem_object *gem_obj; | |
225 | ||
226 | mutex_lock(&drm->struct_mutex); | |
227 | ||
228 | gem_obj = drm_gem_object_lookup(drm, file_priv, handle); | |
229 | if (!gem_obj) { | |
230 | dev_err(drm->dev, "failed to lookup gem object\n"); | |
231 | mutex_unlock(&drm->struct_mutex); | |
232 | return -EINVAL; | |
233 | } | |
234 | ||
0de23977 | 235 | *offset = drm_vma_node_offset_addr(&gem_obj->vma_node); |
b9d47450 SH |
236 | |
237 | drm_gem_object_unreference(gem_obj); | |
238 | ||
239 | mutex_unlock(&drm->struct_mutex); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset); | |
244 | ||
245 | const struct vm_operations_struct drm_gem_cma_vm_ops = { | |
246 | .open = drm_gem_vm_open, | |
247 | .close = drm_gem_vm_close, | |
248 | }; | |
249 | EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops); | |
250 | ||
ebaf9e03 LP |
251 | static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj, |
252 | struct vm_area_struct *vma) | |
253 | { | |
254 | int ret; | |
255 | ||
256 | ret = remap_pfn_range(vma, vma->vm_start, cma_obj->paddr >> PAGE_SHIFT, | |
257 | vma->vm_end - vma->vm_start, vma->vm_page_prot); | |
258 | if (ret) | |
259 | drm_gem_vm_close(vma); | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
b9d47450 SH |
264 | /* |
265 | * drm_gem_cma_mmap - (struct file_operation)->mmap callback function | |
266 | */ | |
267 | int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma) | |
268 | { | |
b9d47450 | 269 | struct drm_gem_cma_object *cma_obj; |
ebaf9e03 | 270 | struct drm_gem_object *gem_obj; |
b9d47450 SH |
271 | int ret; |
272 | ||
273 | ret = drm_gem_mmap(filp, vma); | |
274 | if (ret) | |
275 | return ret; | |
276 | ||
277 | gem_obj = vma->vm_private_data; | |
278 | cma_obj = to_drm_gem_cma_obj(gem_obj); | |
279 | ||
ebaf9e03 | 280 | return drm_gem_cma_mmap_obj(cma_obj, vma); |
b9d47450 SH |
281 | } |
282 | EXPORT_SYMBOL_GPL(drm_gem_cma_mmap); | |
283 | ||
6f646095 RC |
284 | #ifdef CONFIG_DEBUG_FS |
285 | void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m) | |
286 | { | |
287 | struct drm_gem_object *obj = &cma_obj->base; | |
288 | struct drm_device *dev = obj->dev; | |
0de23977 | 289 | uint64_t off; |
6f646095 RC |
290 | |
291 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); | |
292 | ||
0de23977 | 293 | off = drm_vma_node_start(&obj->vma_node); |
6f646095 RC |
294 | |
295 | seq_printf(m, "%2d (%2d) %08llx %08Zx %p %d", | |
296 | obj->name, obj->refcount.refcount.counter, | |
297 | off, cma_obj->paddr, cma_obj->vaddr, obj->size); | |
298 | ||
299 | seq_printf(m, "\n"); | |
300 | } | |
301 | EXPORT_SYMBOL_GPL(drm_gem_cma_describe); | |
302 | #endif | |
71d7282a | 303 | |
78467dc5 JS |
304 | /* low-level interface prime helpers */ |
305 | struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj) | |
306 | { | |
307 | struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj); | |
308 | struct sg_table *sgt; | |
309 | int ret; | |
310 | ||
311 | sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); | |
312 | if (!sgt) | |
313 | return NULL; | |
314 | ||
315 | ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr, | |
316 | cma_obj->paddr, obj->size); | |
317 | if (ret < 0) | |
318 | goto out; | |
319 | ||
320 | return sgt; | |
321 | ||
322 | out: | |
323 | kfree(sgt); | |
324 | return NULL; | |
325 | } | |
326 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table); | |
327 | ||
328 | struct drm_gem_object * | |
329 | drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size, | |
330 | struct sg_table *sgt) | |
331 | { | |
332 | struct drm_gem_cma_object *cma_obj; | |
333 | ||
334 | if (sgt->nents != 1) | |
335 | return ERR_PTR(-EINVAL); | |
336 | ||
337 | /* Create a CMA GEM buffer. */ | |
338 | cma_obj = __drm_gem_cma_create(dev, size); | |
339 | if (IS_ERR(cma_obj)) | |
340 | return ERR_PTR(PTR_ERR(cma_obj)); | |
341 | ||
342 | cma_obj->paddr = sg_dma_address(sgt->sgl); | |
343 | cma_obj->sgt = sgt; | |
344 | ||
345 | DRM_DEBUG_PRIME("dma_addr = 0x%x, size = %zu\n", cma_obj->paddr, size); | |
346 | ||
347 | return &cma_obj->base; | |
348 | } | |
349 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table); | |
350 | ||
351 | int drm_gem_cma_prime_mmap(struct drm_gem_object *obj, | |
352 | struct vm_area_struct *vma) | |
353 | { | |
354 | struct drm_gem_cma_object *cma_obj; | |
355 | struct drm_device *dev = obj->dev; | |
356 | int ret; | |
357 | ||
358 | mutex_lock(&dev->struct_mutex); | |
359 | ret = drm_gem_mmap_obj(obj, obj->size, vma); | |
360 | mutex_unlock(&dev->struct_mutex); | |
361 | if (ret < 0) | |
362 | return ret; | |
363 | ||
364 | cma_obj = to_drm_gem_cma_obj(obj); | |
365 | return drm_gem_cma_mmap_obj(cma_obj, vma); | |
366 | } | |
367 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap); | |
368 | ||
369 | void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj) | |
370 | { | |
371 | struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj); | |
372 | ||
373 | return cma_obj->vaddr; | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap); | |
376 | ||
377 | void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr) | |
378 | { | |
379 | /* Nothing to do */ | |
380 | } | |
381 | EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap); |