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1c248b7d ID |
1 | /* exynos_drm_gem.c |
2 | * | |
3 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. | |
4 | * Author: Inki Dae <inki.dae@samsung.com> | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the "Software"), | |
8 | * to deal in the Software without restriction, including without limitation | |
9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
10 | * and/or sell copies of the Software, and to permit persons to whom the | |
11 | * Software is furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice (including the next | |
14 | * paragraph) shall be included in all copies or substantial portions of the | |
15 | * Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
21 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
22 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
23 | * OTHER DEALINGS IN THE SOFTWARE. | |
24 | */ | |
25 | ||
26 | #include "drmP.h" | |
27 | #include "drm.h" | |
28 | ||
29 | #include <drm/exynos_drm.h> | |
30 | ||
31 | #include "exynos_drm_drv.h" | |
32 | #include "exynos_drm_gem.h" | |
33 | #include "exynos_drm_buf.h" | |
34 | ||
35 | static unsigned int convert_to_vm_err_msg(int msg) | |
36 | { | |
37 | unsigned int out_msg; | |
38 | ||
39 | switch (msg) { | |
40 | case 0: | |
41 | case -ERESTARTSYS: | |
42 | case -EINTR: | |
43 | out_msg = VM_FAULT_NOPAGE; | |
44 | break; | |
45 | ||
46 | case -ENOMEM: | |
47 | out_msg = VM_FAULT_OOM; | |
48 | break; | |
49 | ||
50 | default: | |
51 | out_msg = VM_FAULT_SIGBUS; | |
52 | break; | |
53 | } | |
54 | ||
55 | return out_msg; | |
56 | } | |
57 | ||
58 | static unsigned int get_gem_mmap_offset(struct drm_gem_object *obj) | |
59 | { | |
60 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
61 | ||
62 | return (unsigned int)obj->map_list.hash.key << PAGE_SHIFT; | |
63 | } | |
64 | ||
f088d5a9 ID |
65 | static struct exynos_drm_gem_obj |
66 | *exynos_drm_gem_init(struct drm_device *drm_dev, | |
67 | struct drm_file *file_priv, unsigned int *handle, | |
68 | unsigned int size) | |
1c248b7d ID |
69 | { |
70 | struct exynos_drm_gem_obj *exynos_gem_obj; | |
1c248b7d ID |
71 | struct drm_gem_object *obj; |
72 | int ret; | |
73 | ||
1c248b7d ID |
74 | exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL); |
75 | if (!exynos_gem_obj) { | |
76 | DRM_ERROR("failed to allocate exynos gem object.\n"); | |
77 | return ERR_PTR(-ENOMEM); | |
78 | } | |
79 | ||
1c248b7d ID |
80 | obj = &exynos_gem_obj->base; |
81 | ||
f088d5a9 | 82 | ret = drm_gem_object_init(drm_dev, obj, size); |
1c248b7d | 83 | if (ret < 0) { |
f088d5a9 ID |
84 | DRM_ERROR("failed to initialize gem object.\n"); |
85 | ret = -EINVAL; | |
86 | goto err_object_init; | |
1c248b7d ID |
87 | } |
88 | ||
89 | DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp); | |
90 | ||
91 | ret = drm_gem_create_mmap_offset(obj); | |
92 | if (ret < 0) { | |
93 | DRM_ERROR("failed to allocate mmap offset.\n"); | |
94 | goto err_create_mmap_offset; | |
95 | } | |
96 | ||
97 | /* | |
98 | * allocate a id of idr table where the obj is registered | |
99 | * and handle has the id what user can see. | |
100 | */ | |
101 | ret = drm_gem_handle_create(file_priv, obj, handle); | |
102 | if (ret) | |
103 | goto err_handle_create; | |
104 | ||
105 | DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle); | |
106 | ||
107 | /* drop reference from allocate - handle holds it now. */ | |
108 | drm_gem_object_unreference_unlocked(obj); | |
109 | ||
110 | return exynos_gem_obj; | |
111 | ||
112 | err_handle_create: | |
113 | drm_gem_free_mmap_offset(obj); | |
114 | ||
115 | err_create_mmap_offset: | |
116 | drm_gem_object_release(obj); | |
117 | ||
f088d5a9 | 118 | err_object_init: |
1c248b7d ID |
119 | kfree(exynos_gem_obj); |
120 | ||
121 | return ERR_PTR(ret); | |
122 | } | |
123 | ||
f088d5a9 ID |
124 | struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev, |
125 | struct drm_file *file_priv, | |
126 | unsigned int *handle, unsigned long size) | |
127 | { | |
128 | ||
129 | struct exynos_drm_gem_obj *exynos_gem_obj = NULL; | |
130 | struct exynos_drm_buf_entry *entry; | |
131 | int ret; | |
132 | ||
133 | size = roundup(size, PAGE_SIZE); | |
134 | ||
135 | DRM_DEBUG_KMS("%s: size = 0x%lx\n", __FILE__, size); | |
136 | ||
137 | entry = exynos_drm_buf_create(dev, size); | |
138 | if (!entry) | |
139 | return ERR_PTR(-ENOMEM); | |
140 | ||
141 | exynos_gem_obj = exynos_drm_gem_init(dev, file_priv, handle, size); | |
142 | if (IS_ERR(exynos_gem_obj)) { | |
143 | ret = PTR_ERR(exynos_gem_obj); | |
144 | goto err_gem_init; | |
145 | } | |
146 | ||
147 | exynos_gem_obj->entry = entry; | |
148 | ||
149 | return exynos_gem_obj; | |
150 | ||
151 | err_gem_init: | |
152 | exynos_drm_buf_destroy(dev, exynos_gem_obj->entry); | |
153 | ||
154 | return ERR_PTR(ret); | |
155 | } | |
156 | ||
1c248b7d | 157 | int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, |
f088d5a9 | 158 | struct drm_file *file_priv) |
1c248b7d ID |
159 | { |
160 | struct drm_exynos_gem_create *args = data; | |
f088d5a9 | 161 | struct exynos_drm_gem_obj *exynos_gem_obj = NULL; |
1c248b7d | 162 | |
f088d5a9 | 163 | DRM_DEBUG_KMS("%s\n", __FILE__); |
1c248b7d | 164 | |
f088d5a9 ID |
165 | exynos_gem_obj = exynos_drm_gem_create(dev, file_priv, |
166 | &args->handle, args->size); | |
1c248b7d ID |
167 | if (IS_ERR(exynos_gem_obj)) |
168 | return PTR_ERR(exynos_gem_obj); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data, | |
174 | struct drm_file *file_priv) | |
175 | { | |
176 | struct drm_exynos_gem_map_off *args = data; | |
177 | ||
178 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
179 | ||
180 | DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n", | |
181 | args->handle, (unsigned long)args->offset); | |
182 | ||
183 | if (!(dev->driver->driver_features & DRIVER_GEM)) { | |
184 | DRM_ERROR("does not support GEM.\n"); | |
185 | return -ENODEV; | |
186 | } | |
187 | ||
188 | return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle, | |
189 | &args->offset); | |
190 | } | |
191 | ||
192 | static int exynos_drm_gem_mmap_buffer(struct file *filp, | |
193 | struct vm_area_struct *vma) | |
194 | { | |
195 | struct drm_gem_object *obj = filp->private_data; | |
196 | struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); | |
197 | struct exynos_drm_buf_entry *entry; | |
198 | unsigned long pfn, vm_size; | |
199 | ||
200 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
201 | ||
202 | vma->vm_flags |= (VM_IO | VM_RESERVED); | |
203 | ||
204 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
205 | vma->vm_file = filp; | |
206 | ||
207 | vm_size = vma->vm_end - vma->vm_start; | |
208 | /* | |
209 | * a entry contains information to physically continuous memory | |
210 | * allocated by user request or at framebuffer creation. | |
211 | */ | |
212 | entry = exynos_gem_obj->entry; | |
213 | ||
214 | /* check if user-requested size is valid. */ | |
215 | if (vm_size > entry->size) | |
216 | return -EINVAL; | |
217 | ||
218 | /* | |
219 | * get page frame number to physical memory to be mapped | |
220 | * to user space. | |
221 | */ | |
222 | pfn = exynos_gem_obj->entry->paddr >> PAGE_SHIFT; | |
223 | ||
224 | DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn); | |
225 | ||
226 | if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size, | |
227 | vma->vm_page_prot)) { | |
228 | DRM_ERROR("failed to remap pfn range.\n"); | |
229 | return -EAGAIN; | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static const struct file_operations exynos_drm_gem_fops = { | |
236 | .mmap = exynos_drm_gem_mmap_buffer, | |
237 | }; | |
238 | ||
239 | int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data, | |
240 | struct drm_file *file_priv) | |
241 | { | |
242 | struct drm_exynos_gem_mmap *args = data; | |
243 | struct drm_gem_object *obj; | |
244 | unsigned int addr; | |
245 | ||
246 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
247 | ||
248 | if (!(dev->driver->driver_features & DRIVER_GEM)) { | |
249 | DRM_ERROR("does not support GEM.\n"); | |
250 | return -ENODEV; | |
251 | } | |
252 | ||
253 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); | |
254 | if (!obj) { | |
255 | DRM_ERROR("failed to lookup gem object.\n"); | |
256 | return -EINVAL; | |
257 | } | |
258 | ||
259 | obj->filp->f_op = &exynos_drm_gem_fops; | |
260 | obj->filp->private_data = obj; | |
261 | ||
262 | down_write(¤t->mm->mmap_sem); | |
263 | addr = do_mmap(obj->filp, 0, args->size, | |
264 | PROT_READ | PROT_WRITE, MAP_SHARED, 0); | |
265 | up_write(¤t->mm->mmap_sem); | |
266 | ||
267 | drm_gem_object_unreference_unlocked(obj); | |
268 | ||
269 | if (IS_ERR((void *)addr)) | |
270 | return PTR_ERR((void *)addr); | |
271 | ||
272 | args->mapped = addr; | |
273 | ||
274 | DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped); | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | int exynos_drm_gem_init_object(struct drm_gem_object *obj) | |
280 | { | |
281 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj) | |
287 | { | |
288 | struct exynos_drm_gem_obj *exynos_gem_obj; | |
289 | ||
290 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
291 | ||
292 | DRM_DEBUG_KMS("handle count = %d\n", | |
293 | atomic_read(&gem_obj->handle_count)); | |
294 | ||
295 | if (gem_obj->map_list.map) | |
296 | drm_gem_free_mmap_offset(gem_obj); | |
297 | ||
298 | /* release file pointer to gem object. */ | |
299 | drm_gem_object_release(gem_obj); | |
300 | ||
301 | exynos_gem_obj = to_exynos_gem_obj(gem_obj); | |
302 | ||
303 | exynos_drm_buf_destroy(gem_obj->dev, exynos_gem_obj->entry); | |
304 | ||
305 | kfree(exynos_gem_obj); | |
306 | } | |
307 | ||
308 | int exynos_drm_gem_dumb_create(struct drm_file *file_priv, | |
309 | struct drm_device *dev, struct drm_mode_create_dumb *args) | |
310 | { | |
311 | struct exynos_drm_gem_obj *exynos_gem_obj; | |
312 | ||
313 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
314 | ||
315 | /* | |
316 | * alocate memory to be used for framebuffer. | |
317 | * - this callback would be called by user application | |
318 | * with DRM_IOCTL_MODE_CREATE_DUMB command. | |
319 | */ | |
320 | ||
321 | args->pitch = args->width * args->bpp >> 3; | |
322 | args->size = args->pitch * args->height; | |
323 | ||
f088d5a9 ID |
324 | exynos_gem_obj = exynos_drm_gem_create(dev, file_priv, &args->handle, |
325 | args->size); | |
1c248b7d ID |
326 | if (IS_ERR(exynos_gem_obj)) |
327 | return PTR_ERR(exynos_gem_obj); | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, | |
333 | struct drm_device *dev, uint32_t handle, uint64_t *offset) | |
334 | { | |
335 | struct exynos_drm_gem_obj *exynos_gem_obj; | |
336 | struct drm_gem_object *obj; | |
337 | ||
338 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
339 | ||
340 | mutex_lock(&dev->struct_mutex); | |
341 | ||
342 | /* | |
343 | * get offset of memory allocated for drm framebuffer. | |
344 | * - this callback would be called by user application | |
345 | * with DRM_IOCTL_MODE_MAP_DUMB command. | |
346 | */ | |
347 | ||
348 | obj = drm_gem_object_lookup(dev, file_priv, handle); | |
349 | if (!obj) { | |
350 | DRM_ERROR("failed to lookup gem object.\n"); | |
351 | mutex_unlock(&dev->struct_mutex); | |
352 | return -EINVAL; | |
353 | } | |
354 | ||
355 | exynos_gem_obj = to_exynos_gem_obj(obj); | |
356 | ||
357 | *offset = get_gem_mmap_offset(&exynos_gem_obj->base); | |
358 | ||
359 | drm_gem_object_unreference(obj); | |
360 | ||
361 | DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); | |
362 | ||
363 | mutex_unlock(&dev->struct_mutex); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
369 | { | |
370 | struct drm_gem_object *obj = vma->vm_private_data; | |
371 | struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); | |
372 | struct drm_device *dev = obj->dev; | |
373 | unsigned long pfn; | |
374 | pgoff_t page_offset; | |
375 | int ret; | |
376 | ||
377 | page_offset = ((unsigned long)vmf->virtual_address - | |
378 | vma->vm_start) >> PAGE_SHIFT; | |
379 | ||
380 | mutex_lock(&dev->struct_mutex); | |
381 | ||
382 | pfn = (exynos_gem_obj->entry->paddr >> PAGE_SHIFT) + page_offset; | |
383 | ||
384 | ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn); | |
385 | ||
386 | mutex_unlock(&dev->struct_mutex); | |
387 | ||
388 | return convert_to_vm_err_msg(ret); | |
389 | } | |
390 | ||
391 | int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) | |
392 | { | |
393 | int ret; | |
394 | ||
395 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
396 | ||
397 | /* set vm_area_struct. */ | |
398 | ret = drm_gem_mmap(filp, vma); | |
399 | if (ret < 0) { | |
400 | DRM_ERROR("failed to mmap.\n"); | |
401 | return ret; | |
402 | } | |
403 | ||
404 | vma->vm_flags &= ~VM_PFNMAP; | |
405 | vma->vm_flags |= VM_MIXEDMAP; | |
406 | ||
407 | return ret; | |
408 | } | |
409 | ||
410 | ||
411 | int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv, | |
412 | struct drm_device *dev, unsigned int handle) | |
413 | { | |
414 | int ret; | |
415 | ||
416 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
417 | ||
418 | /* | |
419 | * obj->refcount and obj->handle_count are decreased and | |
420 | * if both them are 0 then exynos_drm_gem_free_object() | |
421 | * would be called by callback to release resources. | |
422 | */ | |
423 | ret = drm_gem_handle_delete(file_priv, handle); | |
424 | if (ret < 0) { | |
425 | DRM_ERROR("failed to delete drm_gem_handle.\n"); | |
426 | return ret; | |
427 | } | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>"); | |
433 | MODULE_DESCRIPTION("Samsung SoC DRM GEM Module"); | |
434 | MODULE_LICENSE("GPL"); |