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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 | ||
de2ba664 AM |
21 | #include "gem.h" |
22 | ||
3be82743 | 23 | static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo) |
de2ba664 AM |
24 | { |
25 | return container_of(bo, struct tegra_bo, base); | |
26 | } | |
27 | ||
28 | static void tegra_bo_put(struct host1x_bo *bo) | |
29 | { | |
3be82743 | 30 | struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
de2ba664 AM |
31 | struct drm_device *drm = obj->gem.dev; |
32 | ||
33 | mutex_lock(&drm->struct_mutex); | |
34 | drm_gem_object_unreference(&obj->gem); | |
35 | mutex_unlock(&drm->struct_mutex); | |
36 | } | |
37 | ||
38 | static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt) | |
39 | { | |
3be82743 | 40 | struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
de2ba664 AM |
41 | |
42 | return obj->paddr; | |
43 | } | |
44 | ||
45 | static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt) | |
46 | { | |
47 | } | |
48 | ||
49 | static void *tegra_bo_mmap(struct host1x_bo *bo) | |
50 | { | |
3be82743 | 51 | struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
de2ba664 AM |
52 | |
53 | return obj->vaddr; | |
54 | } | |
55 | ||
56 | static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) | |
57 | { | |
58 | } | |
59 | ||
60 | static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page) | |
61 | { | |
3be82743 | 62 | struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
de2ba664 AM |
63 | |
64 | return obj->vaddr + page * PAGE_SIZE; | |
65 | } | |
66 | ||
67 | static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page, | |
68 | void *addr) | |
69 | { | |
70 | } | |
71 | ||
72 | static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) | |
73 | { | |
3be82743 | 74 | struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
de2ba664 AM |
75 | struct drm_device *drm = obj->gem.dev; |
76 | ||
77 | mutex_lock(&drm->struct_mutex); | |
78 | drm_gem_object_reference(&obj->gem); | |
79 | mutex_unlock(&drm->struct_mutex); | |
80 | ||
81 | return bo; | |
82 | } | |
83 | ||
84 | const struct host1x_bo_ops tegra_bo_ops = { | |
85 | .get = tegra_bo_get, | |
86 | .put = tegra_bo_put, | |
87 | .pin = tegra_bo_pin, | |
88 | .unpin = tegra_bo_unpin, | |
89 | .mmap = tegra_bo_mmap, | |
90 | .munmap = tegra_bo_munmap, | |
91 | .kmap = tegra_bo_kmap, | |
92 | .kunmap = tegra_bo_kunmap, | |
93 | }; | |
94 | ||
95 | static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo) | |
96 | { | |
97 | dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr); | |
98 | } | |
99 | ||
de2ba664 AM |
100 | struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size) |
101 | { | |
102 | struct tegra_bo *bo; | |
103 | int err; | |
104 | ||
105 | bo = kzalloc(sizeof(*bo), GFP_KERNEL); | |
106 | if (!bo) | |
107 | return ERR_PTR(-ENOMEM); | |
108 | ||
109 | host1x_bo_init(&bo->base, &tegra_bo_ops); | |
110 | size = round_up(size, PAGE_SIZE); | |
111 | ||
112 | bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr, | |
113 | GFP_KERNEL | __GFP_NOWARN); | |
114 | if (!bo->vaddr) { | |
115 | dev_err(drm->dev, "failed to allocate buffer with size %u\n", | |
116 | size); | |
117 | err = -ENOMEM; | |
118 | goto err_dma; | |
119 | } | |
120 | ||
121 | err = drm_gem_object_init(drm, &bo->gem, size); | |
122 | if (err) | |
123 | goto err_init; | |
124 | ||
125 | err = drm_gem_create_mmap_offset(&bo->gem); | |
126 | if (err) | |
127 | goto err_mmap; | |
128 | ||
129 | return bo; | |
130 | ||
131 | err_mmap: | |
132 | drm_gem_object_release(&bo->gem); | |
133 | err_init: | |
134 | tegra_bo_destroy(drm, bo); | |
135 | err_dma: | |
136 | kfree(bo); | |
137 | ||
138 | return ERR_PTR(err); | |
139 | ||
140 | } | |
141 | ||
142 | struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, | |
3be82743 TR |
143 | struct drm_device *drm, |
144 | unsigned int size, | |
145 | unsigned int *handle) | |
de2ba664 AM |
146 | { |
147 | struct tegra_bo *bo; | |
148 | int ret; | |
149 | ||
150 | bo = tegra_bo_create(drm, size); | |
151 | if (IS_ERR(bo)) | |
152 | return bo; | |
153 | ||
154 | ret = drm_gem_handle_create(file, &bo->gem, handle); | |
155 | if (ret) | |
156 | goto err; | |
157 | ||
158 | drm_gem_object_unreference_unlocked(&bo->gem); | |
159 | ||
160 | return bo; | |
161 | ||
162 | err: | |
163 | tegra_bo_free_object(&bo->gem); | |
164 | return ERR_PTR(ret); | |
165 | } | |
166 | ||
167 | void tegra_bo_free_object(struct drm_gem_object *gem) | |
168 | { | |
169 | struct tegra_bo *bo = to_tegra_bo(gem); | |
170 | ||
0de23977 | 171 | drm_gem_free_mmap_offset(gem); |
de2ba664 AM |
172 | drm_gem_object_release(gem); |
173 | tegra_bo_destroy(gem->dev, bo); | |
174 | ||
175 | kfree(bo); | |
176 | } | |
177 | ||
178 | int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, | |
179 | struct drm_mode_create_dumb *args) | |
180 | { | |
181 | int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); | |
182 | struct tegra_bo *bo; | |
183 | ||
184 | if (args->pitch < min_pitch) | |
185 | args->pitch = min_pitch; | |
186 | ||
187 | if (args->size < args->pitch * args->height) | |
188 | args->size = args->pitch * args->height; | |
189 | ||
190 | bo = tegra_bo_create_with_handle(file, drm, args->size, | |
3be82743 | 191 | &args->handle); |
de2ba664 AM |
192 | if (IS_ERR(bo)) |
193 | return PTR_ERR(bo); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm, | |
199 | uint32_t handle, uint64_t *offset) | |
200 | { | |
201 | struct drm_gem_object *gem; | |
202 | struct tegra_bo *bo; | |
203 | ||
204 | mutex_lock(&drm->struct_mutex); | |
205 | ||
206 | gem = drm_gem_object_lookup(drm, file, handle); | |
207 | if (!gem) { | |
208 | dev_err(drm->dev, "failed to lookup GEM object\n"); | |
209 | mutex_unlock(&drm->struct_mutex); | |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | bo = to_tegra_bo(gem); | |
214 | ||
2bc7b0ca | 215 | *offset = drm_vma_node_offset_addr(&bo->gem.vma_node); |
de2ba664 AM |
216 | |
217 | drm_gem_object_unreference(gem); | |
218 | ||
219 | mutex_unlock(&drm->struct_mutex); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | const struct vm_operations_struct tegra_bo_vm_ops = { | |
225 | .open = drm_gem_vm_open, | |
226 | .close = drm_gem_vm_close, | |
227 | }; | |
228 | ||
229 | int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) | |
230 | { | |
231 | struct drm_gem_object *gem; | |
232 | struct tegra_bo *bo; | |
233 | int ret; | |
234 | ||
235 | ret = drm_gem_mmap(file, vma); | |
236 | if (ret) | |
237 | return ret; | |
238 | ||
239 | gem = vma->vm_private_data; | |
240 | bo = to_tegra_bo(gem); | |
241 | ||
242 | ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT, | |
243 | vma->vm_end - vma->vm_start, vma->vm_page_prot); | |
244 | if (ret) | |
245 | drm_gem_vm_close(vma); | |
246 | ||
247 | return ret; | |
248 | } |