summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/vkms/vkms_drv.c
blob: dd0af086e7fa943a11a5b6867c997533b75dfa34 (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
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
// SPDX-License-Identifier: GPL-2.0+

/**
 * DOC: vkms (Virtual Kernel Modesetting)
 *
 * VKMS is a software-only model of a KMS driver that is useful for testing
 * and for running X (or similar) on headless machines. VKMS aims to enable
 * a virtual display with no need of a hardware display capability, releasing
 * the GPU in DRM API tests.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>

#include <drm/drm_gem.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_generic.h>
#include <drm/drm_file.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_managed.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_vblank.h>

#include "vkms_drv.h"

#include <drm/drm_print.h>
#include <drm/drm_debugfs.h>

#define DRIVER_NAME	"vkms"
#define DRIVER_DESC	"Virtual Kernel Mode Setting"
#define DRIVER_DATE	"20180514"
#define DRIVER_MAJOR	1
#define DRIVER_MINOR	0

static struct vkms_config *default_config;

static bool enable_cursor = true;
module_param_named(enable_cursor, enable_cursor, bool, 0444);
MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support");

static bool enable_writeback = true;
module_param_named(enable_writeback, enable_writeback, bool, 0444);
MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector support");

static bool enable_overlay;
module_param_named(enable_overlay, enable_overlay, bool, 0444);
MODULE_PARM_DESC(enable_overlay, "Enable/Disable overlay support");

DEFINE_DRM_GEM_FOPS(vkms_driver_fops);

static void vkms_release(struct drm_device *dev)
{
	struct vkms_device *vkms = drm_device_to_vkms_device(dev);

	if (vkms->output.composer_workq)
		destroy_workqueue(vkms->output.composer_workq);
}

static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
{
	struct drm_device *dev = old_state->dev;
	struct drm_crtc *crtc;
	struct drm_crtc_state *old_crtc_state;
	int i;

	drm_atomic_helper_commit_modeset_disables(dev, old_state);

	drm_atomic_helper_commit_planes(dev, old_state, 0);

	drm_atomic_helper_commit_modeset_enables(dev, old_state);

	drm_atomic_helper_fake_vblank(old_state);

	drm_atomic_helper_commit_hw_done(old_state);

	drm_atomic_helper_wait_for_flip_done(dev, old_state);

	for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
		struct vkms_crtc_state *vkms_state =
			to_vkms_crtc_state(old_crtc_state);

		flush_work(&vkms_state->composer_work);
	}

	drm_atomic_helper_cleanup_planes(dev, old_state);
}

static int vkms_config_show(struct seq_file *m, void *data)
{
	struct drm_debugfs_entry *entry = m->private;
	struct drm_device *dev = entry->dev;
	struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);

	seq_printf(m, "writeback=%d\n", vkmsdev->config->writeback);
	seq_printf(m, "cursor=%d\n", vkmsdev->config->cursor);
	seq_printf(m, "overlay=%d\n", vkmsdev->config->overlay);

	return 0;
}

static const struct drm_debugfs_info vkms_config_debugfs_list[] = {
	{ "vkms_config", vkms_config_show, 0 },
};

static const struct drm_driver vkms_driver = {
	.driver_features	= DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
	.release		= vkms_release,
	.fops			= &vkms_driver_fops,
	DRM_GEM_SHMEM_DRIVER_OPS,

	.name			= DRIVER_NAME,
	.desc			= DRIVER_DESC,
	.date			= DRIVER_DATE,
	.major			= DRIVER_MAJOR,
	.minor			= DRIVER_MINOR,
};

static int vkms_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
{
	struct drm_crtc *crtc;
	struct drm_crtc_state *new_crtc_state;
	int i;

	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
		if (!new_crtc_state->gamma_lut || !new_crtc_state->color_mgmt_changed)
			continue;

		if (new_crtc_state->gamma_lut->length / sizeof(struct drm_color_lut *)
		    > VKMS_LUT_SIZE)
			return -EINVAL;
	}

	return drm_atomic_helper_check(dev, state);
}

static const struct drm_mode_config_funcs vkms_mode_funcs = {
	.fb_create = drm_gem_fb_create,
	.atomic_check = vkms_atomic_check,
	.atomic_commit = drm_atomic_helper_commit,
};

static const struct drm_mode_config_helper_funcs vkms_mode_config_helpers = {
	.atomic_commit_tail = vkms_atomic_commit_tail,
};

static int vkms_modeset_init(struct vkms_device *vkmsdev)
{
	struct drm_device *dev = &vkmsdev->drm;
	int ret;

	ret = drmm_mode_config_init(dev);
	if (ret)
		return ret;

	dev->mode_config.funcs = &vkms_mode_funcs;
	dev->mode_config.min_width = XRES_MIN;
	dev->mode_config.min_height = YRES_MIN;
	dev->mode_config.max_width = XRES_MAX;
	dev->mode_config.max_height = YRES_MAX;
	dev->mode_config.cursor_width = 512;
	dev->mode_config.cursor_height = 512;
	/* FIXME: There's a confusion between bpp and depth between this and
	 * fbdev helpers. We have to go with 0, meaning "pick the default",
	 * which ix XRGB8888 in all cases. */
	dev->mode_config.preferred_depth = 0;
	dev->mode_config.helper_private = &vkms_mode_config_helpers;

	return vkms_output_init(vkmsdev, 0);
}

static int vkms_create(struct vkms_config *config)
{
	int ret;
	struct platform_device *pdev;
	struct vkms_device *vkms_device;

	pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);

	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
		ret = -ENOMEM;
		goto out_unregister;
	}

	vkms_device = devm_drm_dev_alloc(&pdev->dev, &vkms_driver,
					 struct vkms_device, drm);
	if (IS_ERR(vkms_device)) {
		ret = PTR_ERR(vkms_device);
		goto out_devres;
	}
	vkms_device->platform = pdev;
	vkms_device->config = config;
	config->dev = vkms_device;

	ret = dma_coerce_mask_and_coherent(vkms_device->drm.dev,
					   DMA_BIT_MASK(64));

	if (ret) {
		DRM_ERROR("Could not initialize DMA support\n");
		goto out_devres;
	}

	ret = drm_vblank_init(&vkms_device->drm, 1);
	if (ret) {
		DRM_ERROR("Failed to vblank\n");
		goto out_devres;
	}

	ret = vkms_modeset_init(vkms_device);
	if (ret)
		goto out_devres;

	drm_debugfs_add_files(&vkms_device->drm, vkms_config_debugfs_list,
			      ARRAY_SIZE(vkms_config_debugfs_list));

	ret = drm_dev_register(&vkms_device->drm, 0);
	if (ret)
		goto out_devres;

	drm_fbdev_generic_setup(&vkms_device->drm, 0);

	return 0;

out_devres:
	devres_release_group(&pdev->dev, NULL);
out_unregister:
	platform_device_unregister(pdev);
	return ret;
}

static int __init vkms_init(void)
{
	int ret;
	struct vkms_config *config;

	config = kmalloc(sizeof(*config), GFP_KERNEL);
	if (!config)
		return -ENOMEM;

	default_config = config;

	config->cursor = enable_cursor;
	config->writeback = enable_writeback;
	config->overlay = enable_overlay;

	ret = vkms_create(config);
	if (ret)
		kfree(config);

	return ret;
}

static void vkms_destroy(struct vkms_config *config)
{
	struct platform_device *pdev;

	if (!config->dev) {
		DRM_INFO("vkms_device is NULL.\n");
		return;
	}

	pdev = config->dev->platform;

	drm_dev_unregister(&config->dev->drm);
	drm_atomic_helper_shutdown(&config->dev->drm);
	devres_release_group(&pdev->dev, NULL);
	platform_device_unregister(pdev);

	config->dev = NULL;
}

static void __exit vkms_exit(void)
{
	if (default_config->dev)
		vkms_destroy(default_config);

	kfree(default_config);
}

module_init(vkms_init);
module_exit(vkms_exit);

MODULE_AUTHOR("Haneen Mohammed <hamohammed.sa@gmail.com>");
MODULE_AUTHOR("Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");