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_tegra_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_tegra_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_tegra_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_tegra_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_tegra_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_tegra_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
);
172 drm_gem_object_release(gem
);
173 tegra_bo_destroy(gem
->dev
, bo
);
178 int tegra_bo_dumb_create(struct drm_file
*file
, struct drm_device
*drm
,
179 struct drm_mode_create_dumb
*args
)
181 int min_pitch
= DIV_ROUND_UP(args
->width
* args
->bpp
, 8);
184 if (args
->pitch
< min_pitch
)
185 args
->pitch
= min_pitch
;
187 if (args
->size
< args
->pitch
* args
->height
)
188 args
->size
= args
->pitch
* args
->height
;
190 bo
= tegra_bo_create_with_handle(file
, drm
, args
->size
,
198 int tegra_bo_dumb_map_offset(struct drm_file
*file
, struct drm_device
*drm
,
199 uint32_t handle
, uint64_t *offset
)
201 struct drm_gem_object
*gem
;
204 mutex_lock(&drm
->struct_mutex
);
206 gem
= drm_gem_object_lookup(drm
, file
, handle
);
208 dev_err(drm
->dev
, "failed to lookup GEM object\n");
209 mutex_unlock(&drm
->struct_mutex
);
213 bo
= to_tegra_bo(gem
);
215 *offset
= drm_vma_node_offset_addr(&bo
->gem
.vma_node
);
217 drm_gem_object_unreference(gem
);
219 mutex_unlock(&drm
->struct_mutex
);
224 const struct vm_operations_struct tegra_bo_vm_ops
= {
225 .open
= drm_gem_vm_open
,
226 .close
= drm_gem_vm_close
,
229 int tegra_drm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
231 struct drm_gem_object
*gem
;
235 ret
= drm_gem_mmap(file
, vma
);
239 gem
= vma
->vm_private_data
;
240 bo
= to_tegra_bo(gem
);
242 ret
= remap_pfn_range(vma
, vma
->vm_start
, bo
->paddr
>> PAGE_SHIFT
,
243 vma
->vm_end
- vma
->vm_start
, vma
->vm_page_prot
);
245 drm_gem_vm_close(vma
);