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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> | |
24 | #include <linux/dma-mapping.h> | |
25 | ||
26 | #include <drm/drmP.h> | |
27 | #include <drm/drm.h> | |
28 | #include <drm/drm_gem_cma_helper.h> | |
29 | ||
30 | static unsigned int get_gem_mmap_offset(struct drm_gem_object *obj) | |
31 | { | |
32 | return (unsigned int)obj->map_list.hash.key << PAGE_SHIFT; | |
33 | } | |
34 | ||
b9d47450 | 35 | /* |
a5ed8940 LP |
36 | * __drm_gem_cma_create - Create a GEM CMA object without allocating memory |
37 | * @drm: The drm device | |
38 | * @size: The GEM object size | |
b9d47450 | 39 | * |
a5ed8940 LP |
40 | * This function creates and initializes a GEM CMA object of the given size, but |
41 | * doesn't allocate any memory to back the object. | |
42 | * | |
43 | * Return a struct drm_gem_cma_object* on success or ERR_PTR values on failure. | |
b9d47450 | 44 | */ |
a5ed8940 LP |
45 | static struct drm_gem_cma_object * |
46 | __drm_gem_cma_create(struct drm_device *drm, unsigned int size) | |
b9d47450 SH |
47 | { |
48 | struct drm_gem_cma_object *cma_obj; | |
49 | struct drm_gem_object *gem_obj; | |
50 | int ret; | |
51 | ||
b9d47450 SH |
52 | cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL); |
53 | if (!cma_obj) | |
54 | return ERR_PTR(-ENOMEM); | |
55 | ||
b9d47450 SH |
56 | gem_obj = &cma_obj->base; |
57 | ||
58 | ret = drm_gem_object_init(drm, gem_obj, size); | |
59 | if (ret) | |
a5ed8940 | 60 | goto error; |
b9d47450 SH |
61 | |
62 | ret = drm_gem_create_mmap_offset(gem_obj); | |
a5ed8940 LP |
63 | if (ret) { |
64 | drm_gem_object_release(gem_obj); | |
65 | goto error; | |
66 | } | |
b9d47450 SH |
67 | |
68 | return cma_obj; | |
69 | ||
a5ed8940 LP |
70 | error: |
71 | kfree(cma_obj); | |
72 | return ERR_PTR(ret); | |
73 | } | |
b9d47450 | 74 | |
a5ed8940 LP |
75 | /* |
76 | * drm_gem_cma_create - allocate an object with the given size | |
77 | * | |
78 | * returns a struct drm_gem_cma_object* on success or ERR_PTR values | |
79 | * on failure. | |
80 | */ | |
81 | struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, | |
82 | unsigned int size) | |
83 | { | |
84 | struct drm_gem_cma_object *cma_obj; | |
b9d47450 | 85 | |
a5ed8940 | 86 | size = round_up(size, PAGE_SIZE); |
b9d47450 | 87 | |
a5ed8940 LP |
88 | cma_obj = __drm_gem_cma_create(drm, size); |
89 | if (IS_ERR(cma_obj)) | |
90 | return cma_obj; | |
91 | ||
92 | cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size, | |
93 | &cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN); | |
94 | if (!cma_obj->vaddr) { | |
95 | dev_err(drm->dev, "failed to allocate buffer with size %d\n", | |
96 | size); | |
97 | drm_gem_cma_free_object(&cma_obj->base); | |
98 | return ERR_PTR(-ENOMEM); | |
99 | } | |
100 | ||
101 | return cma_obj; | |
b9d47450 SH |
102 | } |
103 | EXPORT_SYMBOL_GPL(drm_gem_cma_create); | |
104 | ||
105 | /* | |
106 | * drm_gem_cma_create_with_handle - allocate an object with the given | |
107 | * size and create a gem handle on it | |
108 | * | |
109 | * returns a struct drm_gem_cma_object* on success or ERR_PTR values | |
110 | * on failure. | |
111 | */ | |
112 | static struct drm_gem_cma_object *drm_gem_cma_create_with_handle( | |
113 | struct drm_file *file_priv, | |
114 | struct drm_device *drm, unsigned int size, | |
115 | unsigned int *handle) | |
116 | { | |
117 | struct drm_gem_cma_object *cma_obj; | |
118 | struct drm_gem_object *gem_obj; | |
119 | int ret; | |
120 | ||
121 | cma_obj = drm_gem_cma_create(drm, size); | |
122 | if (IS_ERR(cma_obj)) | |
123 | return cma_obj; | |
124 | ||
125 | gem_obj = &cma_obj->base; | |
126 | ||
127 | /* | |
128 | * allocate a id of idr table where the obj is registered | |
129 | * and handle has the id what user can see. | |
130 | */ | |
131 | ret = drm_gem_handle_create(file_priv, gem_obj, handle); | |
132 | if (ret) | |
133 | goto err_handle_create; | |
134 | ||
135 | /* drop reference from allocate - handle holds it now. */ | |
136 | drm_gem_object_unreference_unlocked(gem_obj); | |
137 | ||
138 | return cma_obj; | |
139 | ||
140 | err_handle_create: | |
141 | drm_gem_cma_free_object(gem_obj); | |
142 | ||
143 | return ERR_PTR(ret); | |
144 | } | |
145 | ||
146 | /* | |
147 | * drm_gem_cma_free_object - (struct drm_driver)->gem_free_object callback | |
148 | * function | |
149 | */ | |
150 | void drm_gem_cma_free_object(struct drm_gem_object *gem_obj) | |
151 | { | |
152 | struct drm_gem_cma_object *cma_obj; | |
153 | ||
154 | if (gem_obj->map_list.map) | |
155 | drm_gem_free_mmap_offset(gem_obj); | |
156 | ||
b9d47450 SH |
157 | cma_obj = to_drm_gem_cma_obj(gem_obj); |
158 | ||
a5ed8940 LP |
159 | if (cma_obj->vaddr) |
160 | dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size, | |
161 | cma_obj->vaddr, cma_obj->paddr); | |
162 | ||
163 | drm_gem_object_release(gem_obj); | |
b9d47450 SH |
164 | |
165 | kfree(cma_obj); | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(drm_gem_cma_free_object); | |
168 | ||
169 | /* | |
170 | * drm_gem_cma_dumb_create - (struct drm_driver)->dumb_create callback | |
171 | * function | |
172 | * | |
173 | * This aligns the pitch and size arguments to the minimum required. wrap | |
174 | * this into your own function if you need bigger alignment. | |
175 | */ | |
176 | int drm_gem_cma_dumb_create(struct drm_file *file_priv, | |
177 | struct drm_device *dev, struct drm_mode_create_dumb *args) | |
178 | { | |
179 | struct drm_gem_cma_object *cma_obj; | |
180 | int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); | |
181 | ||
182 | if (args->pitch < min_pitch) | |
183 | args->pitch = min_pitch; | |
184 | ||
185 | if (args->size < args->pitch * args->height) | |
186 | args->size = args->pitch * args->height; | |
187 | ||
188 | cma_obj = drm_gem_cma_create_with_handle(file_priv, dev, | |
189 | args->size, &args->handle); | |
190 | if (IS_ERR(cma_obj)) | |
191 | return PTR_ERR(cma_obj); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create); | |
196 | ||
197 | /* | |
198 | * drm_gem_cma_dumb_map_offset - (struct drm_driver)->dumb_map_offset callback | |
199 | * function | |
200 | */ | |
201 | int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv, | |
202 | struct drm_device *drm, uint32_t handle, uint64_t *offset) | |
203 | { | |
204 | struct drm_gem_object *gem_obj; | |
205 | ||
206 | mutex_lock(&drm->struct_mutex); | |
207 | ||
208 | gem_obj = drm_gem_object_lookup(drm, file_priv, handle); | |
209 | if (!gem_obj) { | |
210 | dev_err(drm->dev, "failed to lookup gem object\n"); | |
211 | mutex_unlock(&drm->struct_mutex); | |
212 | return -EINVAL; | |
213 | } | |
214 | ||
215 | *offset = get_gem_mmap_offset(gem_obj); | |
216 | ||
217 | drm_gem_object_unreference(gem_obj); | |
218 | ||
219 | mutex_unlock(&drm->struct_mutex); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset); | |
224 | ||
225 | const struct vm_operations_struct drm_gem_cma_vm_ops = { | |
226 | .open = drm_gem_vm_open, | |
227 | .close = drm_gem_vm_close, | |
228 | }; | |
229 | EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops); | |
230 | ||
231 | /* | |
232 | * drm_gem_cma_mmap - (struct file_operation)->mmap callback function | |
233 | */ | |
234 | int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma) | |
235 | { | |
236 | struct drm_gem_object *gem_obj; | |
237 | struct drm_gem_cma_object *cma_obj; | |
238 | int ret; | |
239 | ||
240 | ret = drm_gem_mmap(filp, vma); | |
241 | if (ret) | |
242 | return ret; | |
243 | ||
244 | gem_obj = vma->vm_private_data; | |
245 | cma_obj = to_drm_gem_cma_obj(gem_obj); | |
246 | ||
247 | ret = remap_pfn_range(vma, vma->vm_start, cma_obj->paddr >> PAGE_SHIFT, | |
248 | vma->vm_end - vma->vm_start, vma->vm_page_prot); | |
249 | if (ret) | |
250 | drm_gem_vm_close(vma); | |
251 | ||
252 | return ret; | |
253 | } | |
254 | EXPORT_SYMBOL_GPL(drm_gem_cma_mmap); | |
255 | ||
256 | /* | |
257 | * drm_gem_cma_dumb_destroy - (struct drm_driver)->dumb_destroy callback function | |
258 | */ | |
259 | int drm_gem_cma_dumb_destroy(struct drm_file *file_priv, | |
260 | struct drm_device *drm, unsigned int handle) | |
261 | { | |
262 | return drm_gem_handle_delete(file_priv, handle); | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_destroy); | |
6f646095 RC |
265 | |
266 | #ifdef CONFIG_DEBUG_FS | |
267 | void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m) | |
268 | { | |
269 | struct drm_gem_object *obj = &cma_obj->base; | |
270 | struct drm_device *dev = obj->dev; | |
271 | uint64_t off = 0; | |
272 | ||
273 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); | |
274 | ||
275 | if (obj->map_list.map) | |
276 | off = (uint64_t)obj->map_list.hash.key; | |
277 | ||
278 | seq_printf(m, "%2d (%2d) %08llx %08Zx %p %d", | |
279 | obj->name, obj->refcount.refcount.counter, | |
280 | off, cma_obj->paddr, cma_obj->vaddr, obj->size); | |
281 | ||
282 | seq_printf(m, "\n"); | |
283 | } | |
284 | EXPORT_SYMBOL_GPL(drm_gem_cma_describe); | |
285 | #endif |