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de2ba664 AM |
1 | /* |
2 | * NVIDIA Tegra DRM GEM helper functions | |
3 | * | |
4 | * Copyright (C) 2012 Sascha Hauer, Pengutronix | |
5 | * Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved. | |
6 | * | |
7 | * Based on the GEM/CMA helpers | |
8 | * | |
9 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version 2 | |
14 | * of the License, or (at your option) any later version. | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | */ | |
20 | ||
21 | #include <linux/mm.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/mutex.h> | |
24 | #include <linux/export.h> | |
25 | #include <linux/dma-mapping.h> | |
26 | ||
27 | #include <drm/drmP.h> | |
28 | #include <drm/drm.h> | |
29 | ||
30 | #include "gem.h" | |
31 | ||
32 | static inline struct tegra_bo *host1x_to_drm_bo(struct host1x_bo *bo) | |
33 | { | |
34 | return container_of(bo, struct tegra_bo, base); | |
35 | } | |
36 | ||
37 | static void tegra_bo_put(struct host1x_bo *bo) | |
38 | { | |
39 | struct tegra_bo *obj = host1x_to_drm_bo(bo); | |
40 | struct drm_device *drm = obj->gem.dev; | |
41 | ||
42 | mutex_lock(&drm->struct_mutex); | |
43 | drm_gem_object_unreference(&obj->gem); | |
44 | mutex_unlock(&drm->struct_mutex); | |
45 | } | |
46 | ||
47 | static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt) | |
48 | { | |
49 | struct tegra_bo *obj = host1x_to_drm_bo(bo); | |
50 | ||
51 | return obj->paddr; | |
52 | } | |
53 | ||
54 | static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt) | |
55 | { | |
56 | } | |
57 | ||
58 | static void *tegra_bo_mmap(struct host1x_bo *bo) | |
59 | { | |
60 | struct tegra_bo *obj = host1x_to_drm_bo(bo); | |
61 | ||
62 | return obj->vaddr; | |
63 | } | |
64 | ||
65 | static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) | |
66 | { | |
67 | } | |
68 | ||
69 | static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page) | |
70 | { | |
71 | struct tegra_bo *obj = host1x_to_drm_bo(bo); | |
72 | ||
73 | return obj->vaddr + page * PAGE_SIZE; | |
74 | } | |
75 | ||
76 | static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page, | |
77 | void *addr) | |
78 | { | |
79 | } | |
80 | ||
81 | static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) | |
82 | { | |
83 | struct tegra_bo *obj = host1x_to_drm_bo(bo); | |
84 | struct drm_device *drm = obj->gem.dev; | |
85 | ||
86 | mutex_lock(&drm->struct_mutex); | |
87 | drm_gem_object_reference(&obj->gem); | |
88 | mutex_unlock(&drm->struct_mutex); | |
89 | ||
90 | return bo; | |
91 | } | |
92 | ||
93 | const struct host1x_bo_ops tegra_bo_ops = { | |
94 | .get = tegra_bo_get, | |
95 | .put = tegra_bo_put, | |
96 | .pin = tegra_bo_pin, | |
97 | .unpin = tegra_bo_unpin, | |
98 | .mmap = tegra_bo_mmap, | |
99 | .munmap = tegra_bo_munmap, | |
100 | .kmap = tegra_bo_kmap, | |
101 | .kunmap = tegra_bo_kunmap, | |
102 | }; | |
103 | ||
104 | static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo) | |
105 | { | |
106 | dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr); | |
107 | } | |
108 | ||
109 | unsigned int tegra_bo_get_mmap_offset(struct tegra_bo *bo) | |
110 | { | |
111 | return (unsigned int)bo->gem.map_list.hash.key << PAGE_SHIFT; | |
112 | } | |
113 | ||
114 | struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size) | |
115 | { | |
116 | struct tegra_bo *bo; | |
117 | int err; | |
118 | ||
119 | bo = kzalloc(sizeof(*bo), GFP_KERNEL); | |
120 | if (!bo) | |
121 | return ERR_PTR(-ENOMEM); | |
122 | ||
123 | host1x_bo_init(&bo->base, &tegra_bo_ops); | |
124 | size = round_up(size, PAGE_SIZE); | |
125 | ||
126 | bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr, | |
127 | GFP_KERNEL | __GFP_NOWARN); | |
128 | if (!bo->vaddr) { | |
129 | dev_err(drm->dev, "failed to allocate buffer with size %u\n", | |
130 | size); | |
131 | err = -ENOMEM; | |
132 | goto err_dma; | |
133 | } | |
134 | ||
135 | err = drm_gem_object_init(drm, &bo->gem, size); | |
136 | if (err) | |
137 | goto err_init; | |
138 | ||
139 | err = drm_gem_create_mmap_offset(&bo->gem); | |
140 | if (err) | |
141 | goto err_mmap; | |
142 | ||
143 | return bo; | |
144 | ||
145 | err_mmap: | |
146 | drm_gem_object_release(&bo->gem); | |
147 | err_init: | |
148 | tegra_bo_destroy(drm, bo); | |
149 | err_dma: | |
150 | kfree(bo); | |
151 | ||
152 | return ERR_PTR(err); | |
153 | ||
154 | } | |
155 | ||
156 | struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, | |
157 | struct drm_device *drm, | |
158 | unsigned int size, | |
159 | unsigned int *handle) | |
160 | { | |
161 | struct tegra_bo *bo; | |
162 | int ret; | |
163 | ||
164 | bo = tegra_bo_create(drm, size); | |
165 | if (IS_ERR(bo)) | |
166 | return bo; | |
167 | ||
168 | ret = drm_gem_handle_create(file, &bo->gem, handle); | |
169 | if (ret) | |
170 | goto err; | |
171 | ||
172 | drm_gem_object_unreference_unlocked(&bo->gem); | |
173 | ||
174 | return bo; | |
175 | ||
176 | err: | |
177 | tegra_bo_free_object(&bo->gem); | |
178 | return ERR_PTR(ret); | |
179 | } | |
180 | ||
181 | void tegra_bo_free_object(struct drm_gem_object *gem) | |
182 | { | |
183 | struct tegra_bo *bo = to_tegra_bo(gem); | |
184 | ||
185 | if (gem->map_list.map) | |
186 | drm_gem_free_mmap_offset(gem); | |
187 | ||
188 | drm_gem_object_release(gem); | |
189 | tegra_bo_destroy(gem->dev, bo); | |
190 | ||
191 | kfree(bo); | |
192 | } | |
193 | ||
194 | int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, | |
195 | struct drm_mode_create_dumb *args) | |
196 | { | |
197 | int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); | |
198 | struct tegra_bo *bo; | |
199 | ||
200 | if (args->pitch < min_pitch) | |
201 | args->pitch = min_pitch; | |
202 | ||
203 | if (args->size < args->pitch * args->height) | |
204 | args->size = args->pitch * args->height; | |
205 | ||
206 | bo = tegra_bo_create_with_handle(file, drm, args->size, | |
207 | &args->handle); | |
208 | if (IS_ERR(bo)) | |
209 | return PTR_ERR(bo); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm, | |
215 | uint32_t handle, uint64_t *offset) | |
216 | { | |
217 | struct drm_gem_object *gem; | |
218 | struct tegra_bo *bo; | |
219 | ||
220 | mutex_lock(&drm->struct_mutex); | |
221 | ||
222 | gem = drm_gem_object_lookup(drm, file, handle); | |
223 | if (!gem) { | |
224 | dev_err(drm->dev, "failed to lookup GEM object\n"); | |
225 | mutex_unlock(&drm->struct_mutex); | |
226 | return -EINVAL; | |
227 | } | |
228 | ||
229 | bo = to_tegra_bo(gem); | |
230 | ||
231 | *offset = tegra_bo_get_mmap_offset(bo); | |
232 | ||
233 | drm_gem_object_unreference(gem); | |
234 | ||
235 | mutex_unlock(&drm->struct_mutex); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | const struct vm_operations_struct tegra_bo_vm_ops = { | |
241 | .open = drm_gem_vm_open, | |
242 | .close = drm_gem_vm_close, | |
243 | }; | |
244 | ||
245 | int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) | |
246 | { | |
247 | struct drm_gem_object *gem; | |
248 | struct tegra_bo *bo; | |
249 | int ret; | |
250 | ||
251 | ret = drm_gem_mmap(file, vma); | |
252 | if (ret) | |
253 | return ret; | |
254 | ||
255 | gem = vma->vm_private_data; | |
256 | bo = to_tegra_bo(gem); | |
257 | ||
258 | ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT, | |
259 | vma->vm_end - vma->vm_start, vma->vm_page_prot); | |
260 | if (ret) | |
261 | drm_gem_vm_close(vma); | |
262 | ||
263 | return ret; | |
264 | } | |
265 | ||
266 | int tegra_bo_dumb_destroy(struct drm_file *file, struct drm_device *drm, | |
267 | unsigned int handle) | |
268 | { | |
269 | return drm_gem_handle_delete(file, handle); | |
270 | } |