summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/vkms/vkms_drv.c
blob: 738dd6206d85b0793d4a0c34057837500069baae (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
// 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,
 * or for running X (or similar) on headless machines and be able to still
 * use the GPU. vkms aims to enable a virtual display without the need for
 * a hardware display capability.
 */

#include <linux/module.h>
#include <drm/drm_gem.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_probe_helper.h>
#include "vkms_drv.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_device *vkms_device;

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

static const struct file_operations vkms_driver_fops = {
	.owner		= THIS_MODULE,
	.open		= drm_open,
	.mmap		= drm_gem_mmap,
	.unlocked_ioctl	= drm_ioctl,
	.compat_ioctl	= drm_compat_ioctl,
	.poll		= drm_poll,
	.read		= drm_read,
	.llseek		= no_llseek,
	.release	= drm_release,
};

static const struct vm_operations_struct vkms_gem_vm_ops = {
	.fault = vkms_gem_fault,
	.open = drm_gem_vm_open,
	.close = drm_gem_vm_close,
};

static void vkms_release(struct drm_device *dev)
{
	struct vkms_device *vkms = container_of(dev, struct vkms_device, drm);

	platform_device_unregister(vkms->platform);
	drm_atomic_helper_shutdown(&vkms->drm);
	drm_mode_config_cleanup(&vkms->drm);
	drm_dev_fini(&vkms->drm);
	destroy_workqueue(vkms->output.crc_workq);
}

static struct drm_driver vkms_driver = {
	.driver_features	= DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
	.release		= vkms_release,
	.fops			= &vkms_driver_fops,
	.dumb_create		= vkms_dumb_create,
	.gem_vm_ops		= &vkms_gem_vm_ops,
	.gem_free_object_unlocked = vkms_gem_free_object,
	.get_vblank_timestamp	= vkms_get_vblank_timestamp,

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

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

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

	drm_mode_config_init(dev);
	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.preferred_depth = 24;

	return vkms_output_init(vkmsdev);
}

static int __init vkms_init(void)
{
	int ret;

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

	vkms_device->platform =
		platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
	if (IS_ERR(vkms_device->platform)) {
		ret = PTR_ERR(vkms_device->platform);
		goto out_free;
	}

	ret = drm_dev_init(&vkms_device->drm, &vkms_driver,
			   &vkms_device->platform->dev);
	if (ret)
		goto out_unregister;

	vkms_device->drm.irq_enabled = true;

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

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

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

	return 0;

out_fini:
	drm_dev_fini(&vkms_device->drm);

out_unregister:
	platform_device_unregister(vkms_device->platform);

out_free:
	kfree(vkms_device);
	return ret;
}

static void __exit vkms_exit(void)
{
	if (!vkms_device) {
		DRM_INFO("vkms_device is NULL.\n");
		return;
	}

	drm_dev_unregister(&vkms_device->drm);
	drm_dev_put(&vkms_device->drm);

	kfree(vkms_device);
}

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");