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.
22 #include <linux/slab.h>
23 #include <linux/mutex.h>
24 #include <linux/export.h>
25 #include <linux/dma-mapping.h>
32 static inline struct tegra_bo *host1x_to_drm_bo(struct host1x_bo *bo)
34 return container_of(bo, struct tegra_bo, base);
37 static void tegra_bo_put(struct host1x_bo *bo)
39 struct tegra_bo *obj = host1x_to_drm_bo(bo);
40 struct drm_device *drm = obj->gem.dev;
42 mutex_lock(&drm->struct_mutex);
43 drm_gem_object_unreference(&obj->gem);
44 mutex_unlock(&drm->struct_mutex);
47 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
49 struct tegra_bo *obj = host1x_to_drm_bo(bo);
54 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
58 static void *tegra_bo_mmap(struct host1x_bo *bo)
60 struct tegra_bo *obj = host1x_to_drm_bo(bo);
65 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
69 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
71 struct tegra_bo *obj = host1x_to_drm_bo(bo);
73 return obj->vaddr + page * PAGE_SIZE;
76 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
81 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
83 struct tegra_bo *obj = host1x_to_drm_bo(bo);
84 struct drm_device *drm = obj->gem.dev;
86 mutex_lock(&drm->struct_mutex);
87 drm_gem_object_reference(&obj->gem);
88 mutex_unlock(&drm->struct_mutex);
93 const struct host1x_bo_ops tegra_bo_ops = {
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,
104 static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
106 dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
109 unsigned int tegra_bo_get_mmap_offset(struct tegra_bo *bo)
111 return (unsigned int)bo->gem.map_list.hash.key << PAGE_SHIFT;
114 struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size)
119 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
121 return ERR_PTR(-ENOMEM);
123 host1x_bo_init(&bo->base, &tegra_bo_ops);
124 size = round_up(size, PAGE_SIZE);
126 bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
127 GFP_KERNEL | __GFP_NOWARN);
129 dev_err(drm->dev, "failed to allocate buffer with size %u\n",
135 err = drm_gem_object_init(drm, &bo->gem, size);
139 err = drm_gem_create_mmap_offset(&bo->gem);
146 drm_gem_object_release(&bo->gem);
148 tegra_bo_destroy(drm, bo);
156 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
157 struct drm_device *drm,
159 unsigned int *handle)
164 bo = tegra_bo_create(drm, size);
168 ret = drm_gem_handle_create(file, &bo->gem, handle);
172 drm_gem_object_unreference_unlocked(&bo->gem);
177 tegra_bo_free_object(&bo->gem);
181 void tegra_bo_free_object(struct drm_gem_object *gem)
183 struct tegra_bo *bo = to_tegra_bo(gem);
185 if (gem->map_list.map)
186 drm_gem_free_mmap_offset(gem);
188 drm_gem_object_release(gem);
189 tegra_bo_destroy(gem->dev, bo);
194 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
195 struct drm_mode_create_dumb *args)
197 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
200 if (args->pitch < min_pitch)
201 args->pitch = min_pitch;
203 if (args->size < args->pitch * args->height)
204 args->size = args->pitch * args->height;
206 bo = tegra_bo_create_with_handle(file, drm, args->size,
214 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
215 uint32_t handle, uint64_t *offset)
217 struct drm_gem_object *gem;
220 mutex_lock(&drm->struct_mutex);
222 gem = drm_gem_object_lookup(drm, file, handle);
224 dev_err(drm->dev, "failed to lookup GEM object\n");
225 mutex_unlock(&drm->struct_mutex);
229 bo = to_tegra_bo(gem);
231 *offset = tegra_bo_get_mmap_offset(bo);
233 drm_gem_object_unreference(gem);
235 mutex_unlock(&drm->struct_mutex);
240 const struct vm_operations_struct tegra_bo_vm_ops = {
241 .open = drm_gem_vm_open,
242 .close = drm_gem_vm_close,
245 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
247 struct drm_gem_object *gem;
251 ret = drm_gem_mmap(file, vma);
255 gem = vma->vm_private_data;
256 bo = to_tegra_bo(gem);
258 ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
259 vma->vm_end - vma->vm_start, vma->vm_page_prot);
261 drm_gem_vm_close(vma);
266 int tegra_bo_dumb_destroy(struct drm_file *file, struct drm_device *drm,
269 return drm_gem_handle_delete(file, handle);