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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 | ||
65 | struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_file *file_priv, | |
66 | struct drm_device *dev, unsigned int size, | |
67 | unsigned int *handle) | |
68 | { | |
69 | struct exynos_drm_gem_obj *exynos_gem_obj; | |
70 | struct exynos_drm_buf_entry *entry; | |
71 | struct drm_gem_object *obj; | |
72 | int ret; | |
73 | ||
74 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
75 | ||
76 | size = roundup(size, PAGE_SIZE); | |
77 | ||
78 | exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL); | |
79 | if (!exynos_gem_obj) { | |
80 | DRM_ERROR("failed to allocate exynos gem object.\n"); | |
81 | return ERR_PTR(-ENOMEM); | |
82 | } | |
83 | ||
84 | /* allocate the new buffer object and memory region. */ | |
85 | entry = exynos_drm_buf_create(dev, size); | |
86 | if (!entry) { | |
87 | kfree(exynos_gem_obj); | |
88 | return ERR_PTR(-ENOMEM); | |
89 | } | |
90 | ||
91 | exynos_gem_obj->entry = entry; | |
92 | ||
93 | obj = &exynos_gem_obj->base; | |
94 | ||
95 | ret = drm_gem_object_init(dev, obj, size); | |
96 | if (ret < 0) { | |
97 | DRM_ERROR("failed to initailize gem object.\n"); | |
98 | goto err_obj_init; | |
99 | } | |
100 | ||
101 | DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp); | |
102 | ||
103 | ret = drm_gem_create_mmap_offset(obj); | |
104 | if (ret < 0) { | |
105 | DRM_ERROR("failed to allocate mmap offset.\n"); | |
106 | goto err_create_mmap_offset; | |
107 | } | |
108 | ||
109 | /* | |
110 | * allocate a id of idr table where the obj is registered | |
111 | * and handle has the id what user can see. | |
112 | */ | |
113 | ret = drm_gem_handle_create(file_priv, obj, handle); | |
114 | if (ret) | |
115 | goto err_handle_create; | |
116 | ||
117 | DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle); | |
118 | ||
119 | /* drop reference from allocate - handle holds it now. */ | |
120 | drm_gem_object_unreference_unlocked(obj); | |
121 | ||
122 | return exynos_gem_obj; | |
123 | ||
124 | err_handle_create: | |
125 | drm_gem_free_mmap_offset(obj); | |
126 | ||
127 | err_create_mmap_offset: | |
128 | drm_gem_object_release(obj); | |
129 | ||
130 | err_obj_init: | |
131 | exynos_drm_buf_destroy(dev, exynos_gem_obj->entry); | |
132 | ||
133 | kfree(exynos_gem_obj); | |
134 | ||
135 | return ERR_PTR(ret); | |
136 | } | |
137 | ||
138 | int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, | |
139 | struct drm_file *file_priv) | |
140 | { | |
141 | struct drm_exynos_gem_create *args = data; | |
142 | struct exynos_drm_gem_obj *exynos_gem_obj; | |
143 | ||
144 | DRM_DEBUG_KMS("%s : size = 0x%x\n", __FILE__, args->size); | |
145 | ||
146 | exynos_gem_obj = exynos_drm_gem_create(file_priv, dev, args->size, | |
147 | &args->handle); | |
148 | if (IS_ERR(exynos_gem_obj)) | |
149 | return PTR_ERR(exynos_gem_obj); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data, | |
155 | struct drm_file *file_priv) | |
156 | { | |
157 | struct drm_exynos_gem_map_off *args = data; | |
158 | ||
159 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
160 | ||
161 | DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n", | |
162 | args->handle, (unsigned long)args->offset); | |
163 | ||
164 | if (!(dev->driver->driver_features & DRIVER_GEM)) { | |
165 | DRM_ERROR("does not support GEM.\n"); | |
166 | return -ENODEV; | |
167 | } | |
168 | ||
169 | return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle, | |
170 | &args->offset); | |
171 | } | |
172 | ||
173 | static int exynos_drm_gem_mmap_buffer(struct file *filp, | |
174 | struct vm_area_struct *vma) | |
175 | { | |
176 | struct drm_gem_object *obj = filp->private_data; | |
177 | struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); | |
178 | struct exynos_drm_buf_entry *entry; | |
179 | unsigned long pfn, vm_size; | |
180 | ||
181 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
182 | ||
183 | vma->vm_flags |= (VM_IO | VM_RESERVED); | |
184 | ||
185 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
186 | vma->vm_file = filp; | |
187 | ||
188 | vm_size = vma->vm_end - vma->vm_start; | |
189 | /* | |
190 | * a entry contains information to physically continuous memory | |
191 | * allocated by user request or at framebuffer creation. | |
192 | */ | |
193 | entry = exynos_gem_obj->entry; | |
194 | ||
195 | /* check if user-requested size is valid. */ | |
196 | if (vm_size > entry->size) | |
197 | return -EINVAL; | |
198 | ||
199 | /* | |
200 | * get page frame number to physical memory to be mapped | |
201 | * to user space. | |
202 | */ | |
203 | pfn = exynos_gem_obj->entry->paddr >> PAGE_SHIFT; | |
204 | ||
205 | DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn); | |
206 | ||
207 | if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size, | |
208 | vma->vm_page_prot)) { | |
209 | DRM_ERROR("failed to remap pfn range.\n"); | |
210 | return -EAGAIN; | |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static const struct file_operations exynos_drm_gem_fops = { | |
217 | .mmap = exynos_drm_gem_mmap_buffer, | |
218 | }; | |
219 | ||
220 | int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data, | |
221 | struct drm_file *file_priv) | |
222 | { | |
223 | struct drm_exynos_gem_mmap *args = data; | |
224 | struct drm_gem_object *obj; | |
225 | unsigned int addr; | |
226 | ||
227 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
228 | ||
229 | if (!(dev->driver->driver_features & DRIVER_GEM)) { | |
230 | DRM_ERROR("does not support GEM.\n"); | |
231 | return -ENODEV; | |
232 | } | |
233 | ||
234 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); | |
235 | if (!obj) { | |
236 | DRM_ERROR("failed to lookup gem object.\n"); | |
237 | return -EINVAL; | |
238 | } | |
239 | ||
240 | obj->filp->f_op = &exynos_drm_gem_fops; | |
241 | obj->filp->private_data = obj; | |
242 | ||
243 | down_write(¤t->mm->mmap_sem); | |
244 | addr = do_mmap(obj->filp, 0, args->size, | |
245 | PROT_READ | PROT_WRITE, MAP_SHARED, 0); | |
246 | up_write(¤t->mm->mmap_sem); | |
247 | ||
248 | drm_gem_object_unreference_unlocked(obj); | |
249 | ||
250 | if (IS_ERR((void *)addr)) | |
251 | return PTR_ERR((void *)addr); | |
252 | ||
253 | args->mapped = addr; | |
254 | ||
255 | DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped); | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | int exynos_drm_gem_init_object(struct drm_gem_object *obj) | |
261 | { | |
262 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj) | |
268 | { | |
269 | struct exynos_drm_gem_obj *exynos_gem_obj; | |
270 | ||
271 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
272 | ||
273 | DRM_DEBUG_KMS("handle count = %d\n", | |
274 | atomic_read(&gem_obj->handle_count)); | |
275 | ||
276 | if (gem_obj->map_list.map) | |
277 | drm_gem_free_mmap_offset(gem_obj); | |
278 | ||
279 | /* release file pointer to gem object. */ | |
280 | drm_gem_object_release(gem_obj); | |
281 | ||
282 | exynos_gem_obj = to_exynos_gem_obj(gem_obj); | |
283 | ||
284 | exynos_drm_buf_destroy(gem_obj->dev, exynos_gem_obj->entry); | |
285 | ||
286 | kfree(exynos_gem_obj); | |
287 | } | |
288 | ||
289 | int exynos_drm_gem_dumb_create(struct drm_file *file_priv, | |
290 | struct drm_device *dev, struct drm_mode_create_dumb *args) | |
291 | { | |
292 | struct exynos_drm_gem_obj *exynos_gem_obj; | |
293 | ||
294 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
295 | ||
296 | /* | |
297 | * alocate memory to be used for framebuffer. | |
298 | * - this callback would be called by user application | |
299 | * with DRM_IOCTL_MODE_CREATE_DUMB command. | |
300 | */ | |
301 | ||
302 | args->pitch = args->width * args->bpp >> 3; | |
303 | args->size = args->pitch * args->height; | |
304 | ||
305 | exynos_gem_obj = exynos_drm_gem_create(file_priv, dev, args->size, | |
306 | &args->handle); | |
307 | if (IS_ERR(exynos_gem_obj)) | |
308 | return PTR_ERR(exynos_gem_obj); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, | |
314 | struct drm_device *dev, uint32_t handle, uint64_t *offset) | |
315 | { | |
316 | struct exynos_drm_gem_obj *exynos_gem_obj; | |
317 | struct drm_gem_object *obj; | |
318 | ||
319 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
320 | ||
321 | mutex_lock(&dev->struct_mutex); | |
322 | ||
323 | /* | |
324 | * get offset of memory allocated for drm framebuffer. | |
325 | * - this callback would be called by user application | |
326 | * with DRM_IOCTL_MODE_MAP_DUMB command. | |
327 | */ | |
328 | ||
329 | obj = drm_gem_object_lookup(dev, file_priv, handle); | |
330 | if (!obj) { | |
331 | DRM_ERROR("failed to lookup gem object.\n"); | |
332 | mutex_unlock(&dev->struct_mutex); | |
333 | return -EINVAL; | |
334 | } | |
335 | ||
336 | exynos_gem_obj = to_exynos_gem_obj(obj); | |
337 | ||
338 | *offset = get_gem_mmap_offset(&exynos_gem_obj->base); | |
339 | ||
340 | drm_gem_object_unreference(obj); | |
341 | ||
342 | DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); | |
343 | ||
344 | mutex_unlock(&dev->struct_mutex); | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
350 | { | |
351 | struct drm_gem_object *obj = vma->vm_private_data; | |
352 | struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); | |
353 | struct drm_device *dev = obj->dev; | |
354 | unsigned long pfn; | |
355 | pgoff_t page_offset; | |
356 | int ret; | |
357 | ||
358 | page_offset = ((unsigned long)vmf->virtual_address - | |
359 | vma->vm_start) >> PAGE_SHIFT; | |
360 | ||
361 | mutex_lock(&dev->struct_mutex); | |
362 | ||
363 | pfn = (exynos_gem_obj->entry->paddr >> PAGE_SHIFT) + page_offset; | |
364 | ||
365 | ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn); | |
366 | ||
367 | mutex_unlock(&dev->struct_mutex); | |
368 | ||
369 | return convert_to_vm_err_msg(ret); | |
370 | } | |
371 | ||
372 | int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) | |
373 | { | |
374 | int ret; | |
375 | ||
376 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
377 | ||
378 | /* set vm_area_struct. */ | |
379 | ret = drm_gem_mmap(filp, vma); | |
380 | if (ret < 0) { | |
381 | DRM_ERROR("failed to mmap.\n"); | |
382 | return ret; | |
383 | } | |
384 | ||
385 | vma->vm_flags &= ~VM_PFNMAP; | |
386 | vma->vm_flags |= VM_MIXEDMAP; | |
387 | ||
388 | return ret; | |
389 | } | |
390 | ||
391 | ||
392 | int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv, | |
393 | struct drm_device *dev, unsigned int handle) | |
394 | { | |
395 | int ret; | |
396 | ||
397 | DRM_DEBUG_KMS("%s\n", __FILE__); | |
398 | ||
399 | /* | |
400 | * obj->refcount and obj->handle_count are decreased and | |
401 | * if both them are 0 then exynos_drm_gem_free_object() | |
402 | * would be called by callback to release resources. | |
403 | */ | |
404 | ret = drm_gem_handle_delete(file_priv, handle); | |
405 | if (ret < 0) { | |
406 | DRM_ERROR("failed to delete drm_gem_handle.\n"); | |
407 | return ret; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>"); | |
414 | MODULE_DESCRIPTION("Samsung SoC DRM GEM Module"); | |
415 | MODULE_LICENSE("GPL"); |