2 * NVIDIA Tegra DRM GEM helper functions
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 * Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved.
7 * Based on the GEM/CMA helpers
9 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
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.
23 static inline struct tegra_bo *host1x_to_drm_bo(struct host1x_bo *bo)
25 return container_of(bo, struct tegra_bo, base);
28 static void tegra_bo_put(struct host1x_bo *bo)
30 struct tegra_bo *obj = host1x_to_drm_bo(bo);
31 struct drm_device *drm = obj->gem.dev;
33 mutex_lock(&drm->struct_mutex);
34 drm_gem_object_unreference(&obj->gem);
35 mutex_unlock(&drm->struct_mutex);
38 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
40 struct tegra_bo *obj = host1x_to_drm_bo(bo);
45 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
49 static void *tegra_bo_mmap(struct host1x_bo *bo)
51 struct tegra_bo *obj = host1x_to_drm_bo(bo);
56 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
60 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
62 struct tegra_bo *obj = host1x_to_drm_bo(bo);
64 return obj->vaddr + page * PAGE_SIZE;
67 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
72 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
74 struct tegra_bo *obj = host1x_to_drm_bo(bo);
75 struct drm_device *drm = obj->gem.dev;
77 mutex_lock(&drm->struct_mutex);
78 drm_gem_object_reference(&obj->gem);
79 mutex_unlock(&drm->struct_mutex);
84 const struct host1x_bo_ops tegra_bo_ops = {
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,
95 static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
97 dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
100 struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size)
105 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
107 return ERR_PTR(-ENOMEM);
109 host1x_bo_init(&bo->base, &tegra_bo_ops);
110 size = round_up(size, PAGE_SIZE);
112 bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
113 GFP_KERNEL | __GFP_NOWARN);
115 dev_err(drm->dev, "failed to allocate buffer with size %u\n",
121 err = drm_gem_object_init(drm, &bo->gem, size);
125 err = drm_gem_create_mmap_offset(&bo->gem);
132 drm_gem_object_release(&bo->gem);
134 tegra_bo_destroy(drm, bo);
142 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
143 struct drm_device *drm,
145 unsigned int *handle)
150 bo = tegra_bo_create(drm, size);
154 ret = drm_gem_handle_create(file, &bo->gem, handle);
158 drm_gem_object_unreference_unlocked(&bo->gem);
163 tegra_bo_free_object(&bo->gem);
167 void tegra_bo_free_object(struct drm_gem_object *gem)
169 struct tegra_bo *bo = to_tegra_bo(gem);
171 drm_gem_free_mmap_offset(gem);
173 drm_gem_object_release(gem);
174 tegra_bo_destroy(gem->dev, bo);
179 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
180 struct drm_mode_create_dumb *args)
182 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
185 if (args->pitch < min_pitch)
186 args->pitch = min_pitch;
188 if (args->size < args->pitch * args->height)
189 args->size = args->pitch * args->height;
191 bo = tegra_bo_create_with_handle(file, drm, args->size,
199 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
200 uint32_t handle, uint64_t *offset)
202 struct drm_gem_object *gem;
205 mutex_lock(&drm->struct_mutex);
207 gem = drm_gem_object_lookup(drm, file, handle);
209 dev_err(drm->dev, "failed to lookup GEM object\n");
210 mutex_unlock(&drm->struct_mutex);
214 bo = to_tegra_bo(gem);
216 *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
218 drm_gem_object_unreference(gem);
220 mutex_unlock(&drm->struct_mutex);
225 const struct vm_operations_struct tegra_bo_vm_ops = {
226 .open = drm_gem_vm_open,
227 .close = drm_gem_vm_close,
230 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
232 struct drm_gem_object *gem;
236 ret = drm_gem_mmap(file, vma);
240 gem = vma->vm_private_data;
241 bo = to_tegra_bo(gem);
243 ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
244 vma->vm_end - vma->vm_start, vma->vm_page_prot);
246 drm_gem_vm_close(vma);