summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/host1x/drm/gem.c
blob: 59623de4ee15f3bf9a186d80481f358397fbf99e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 * NVIDIA Tegra DRM GEM helper functions
 *
 * Copyright (C) 2012 Sascha Hauer, Pengutronix
 * Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved.
 *
 * Based on the GEM/CMA helpers
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <linux/dma-mapping.h>

#include <drm/drmP.h>
#include <drm/drm.h>

#include "gem.h"

static inline struct tegra_bo *host1x_to_drm_bo(struct host1x_bo *bo)
{
	return container_of(bo, struct tegra_bo, base);
}

static void tegra_bo_put(struct host1x_bo *bo)
{
	struct tegra_bo *obj = host1x_to_drm_bo(bo);
	struct drm_device *drm = obj->gem.dev;

	mutex_lock(&drm->struct_mutex);
	drm_gem_object_unreference(&obj->gem);
	mutex_unlock(&drm->struct_mutex);
}

static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
{
	struct tegra_bo *obj = host1x_to_drm_bo(bo);

	return obj->paddr;
}

static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
{
}

static void *tegra_bo_mmap(struct host1x_bo *bo)
{
	struct tegra_bo *obj = host1x_to_drm_bo(bo);

	return obj->vaddr;
}

static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
{
}

static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
{
	struct tegra_bo *obj = host1x_to_drm_bo(bo);

	return obj->vaddr + page * PAGE_SIZE;
}

static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
			    void *addr)
{
}

static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
{
	struct tegra_bo *obj = host1x_to_drm_bo(bo);
	struct drm_device *drm = obj->gem.dev;

	mutex_lock(&drm->struct_mutex);
	drm_gem_object_reference(&obj->gem);
	mutex_unlock(&drm->struct_mutex);

	return bo;
}

const struct host1x_bo_ops tegra_bo_ops = {
	.get = tegra_bo_get,
	.put = tegra_bo_put,
	.pin = tegra_bo_pin,
	.unpin = tegra_bo_unpin,
	.mmap = tegra_bo_mmap,
	.munmap = tegra_bo_munmap,
	.kmap = tegra_bo_kmap,
	.kunmap = tegra_bo_kunmap,
};

static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
{
	dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
}

struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size)
{
	struct tegra_bo *bo;
	int err;

	bo = kzalloc(sizeof(*bo), GFP_KERNEL);
	if (!bo)
		return ERR_PTR(-ENOMEM);

	host1x_bo_init(&bo->base, &tegra_bo_ops);
	size = round_up(size, PAGE_SIZE);

	bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
					   GFP_KERNEL | __GFP_NOWARN);
	if (!bo->vaddr) {
		dev_err(drm->dev, "failed to allocate buffer with size %u\n",
			size);
		err = -ENOMEM;
		goto err_dma;
	}

	err = drm_gem_object_init(drm, &bo->gem, size);
	if (err)
		goto err_init;

	err = drm_gem_create_mmap_offset(&bo->gem);
	if (err)
		goto err_mmap;

	return bo;

err_mmap:
	drm_gem_object_release(&bo->gem);
err_init:
	tegra_bo_destroy(drm, bo);
err_dma:
	kfree(bo);

	return ERR_PTR(err);

}

struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
					    struct drm_device *drm,
					    unsigned int size,
					    unsigned int *handle)
{
	struct tegra_bo *bo;
	int ret;

	bo = tegra_bo_create(drm, size);
	if (IS_ERR(bo))
		return bo;

	ret = drm_gem_handle_create(file, &bo->gem, handle);
	if (ret)
		goto err;

	drm_gem_object_unreference_unlocked(&bo->gem);

	return bo;

err:
	tegra_bo_free_object(&bo->gem);
	return ERR_PTR(ret);
}

void tegra_bo_free_object(struct drm_gem_object *gem)
{
	struct tegra_bo *bo = to_tegra_bo(gem);

	drm_gem_free_mmap_offset(gem);

	drm_gem_object_release(gem);
	tegra_bo_destroy(gem->dev, bo);

	kfree(bo);
}

int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
			 struct drm_mode_create_dumb *args)
{
	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
	struct tegra_bo *bo;

	if (args->pitch < min_pitch)
		args->pitch = min_pitch;

	if (args->size < args->pitch * args->height)
		args->size = args->pitch * args->height;

	bo = tegra_bo_create_with_handle(file, drm, args->size,
					    &args->handle);
	if (IS_ERR(bo))
		return PTR_ERR(bo);

	return 0;
}

int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
			     uint32_t handle, uint64_t *offset)
{
	struct drm_gem_object *gem;
	struct tegra_bo *bo;

	mutex_lock(&drm->struct_mutex);

	gem = drm_gem_object_lookup(drm, file, handle);
	if (!gem) {
		dev_err(drm->dev, "failed to lookup GEM object\n");
		mutex_unlock(&drm->struct_mutex);
		return -EINVAL;
	}

	bo = to_tegra_bo(gem);

	*offset = drm_vma_node_offset_addr(&bo->gem.vma_node);

	drm_gem_object_unreference(gem);

	mutex_unlock(&drm->struct_mutex);

	return 0;
}

const struct vm_operations_struct tegra_bo_vm_ops = {
	.open = drm_gem_vm_open,
	.close = drm_gem_vm_close,
};

int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct drm_gem_object *gem;
	struct tegra_bo *bo;
	int ret;

	ret = drm_gem_mmap(file, vma);
	if (ret)
		return ret;

	gem = vma->vm_private_data;
	bo = to_tegra_bo(gem);

	ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
			      vma->vm_end - vma->vm_start, vma->vm_page_prot);
	if (ret)
		drm_gem_vm_close(vma);

	return ret;
}
OpenPOWER on IntegriCloud