]> Git Repo - linux.git/blob - drivers/gpu/drm/vkms/vkms_drv.c
Merge tag 'amd-drm-next-6.5-2023-06-09' of https://gitlab.freedesktop.org/agd5f/linux...
[linux.git] / drivers / gpu / drm / vkms / vkms_drv.c
1 // SPDX-License-Identifier: GPL-2.0+
2
3 /**
4  * DOC: vkms (Virtual Kernel Modesetting)
5  *
6  * VKMS is a software-only model of a KMS driver that is useful for testing
7  * and for running X (or similar) on headless machines. VKMS aims to enable
8  * a virtual display with no need of a hardware display capability, releasing
9  * the GPU in DRM API tests.
10  */
11
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/dma-mapping.h>
15
16 #include <drm/drm_gem.h>
17 #include <drm/drm_atomic.h>
18 #include <drm/drm_atomic_helper.h>
19 #include <drm/drm_drv.h>
20 #include <drm/drm_fbdev_generic.h>
21 #include <drm/drm_file.h>
22 #include <drm/drm_gem_framebuffer_helper.h>
23 #include <drm/drm_ioctl.h>
24 #include <drm/drm_managed.h>
25 #include <drm/drm_probe_helper.h>
26 #include <drm/drm_gem_shmem_helper.h>
27 #include <drm/drm_vblank.h>
28
29 #include "vkms_drv.h"
30
31 #include <drm/drm_print.h>
32 #include <drm/drm_debugfs.h>
33
34 #define DRIVER_NAME     "vkms"
35 #define DRIVER_DESC     "Virtual Kernel Mode Setting"
36 #define DRIVER_DATE     "20180514"
37 #define DRIVER_MAJOR    1
38 #define DRIVER_MINOR    0
39
40 static struct vkms_config *default_config;
41
42 static bool enable_cursor = true;
43 module_param_named(enable_cursor, enable_cursor, bool, 0444);
44 MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support");
45
46 static bool enable_writeback = true;
47 module_param_named(enable_writeback, enable_writeback, bool, 0444);
48 MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector support");
49
50 static bool enable_overlay;
51 module_param_named(enable_overlay, enable_overlay, bool, 0444);
52 MODULE_PARM_DESC(enable_overlay, "Enable/Disable overlay support");
53
54 DEFINE_DRM_GEM_FOPS(vkms_driver_fops);
55
56 static void vkms_release(struct drm_device *dev)
57 {
58         struct vkms_device *vkms = drm_device_to_vkms_device(dev);
59
60         if (vkms->output.composer_workq)
61                 destroy_workqueue(vkms->output.composer_workq);
62 }
63
64 static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
65 {
66         struct drm_device *dev = old_state->dev;
67         struct drm_crtc *crtc;
68         struct drm_crtc_state *old_crtc_state;
69         int i;
70
71         drm_atomic_helper_commit_modeset_disables(dev, old_state);
72
73         drm_atomic_helper_commit_planes(dev, old_state, 0);
74
75         drm_atomic_helper_commit_modeset_enables(dev, old_state);
76
77         drm_atomic_helper_fake_vblank(old_state);
78
79         drm_atomic_helper_commit_hw_done(old_state);
80
81         drm_atomic_helper_wait_for_flip_done(dev, old_state);
82
83         for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
84                 struct vkms_crtc_state *vkms_state =
85                         to_vkms_crtc_state(old_crtc_state);
86
87                 flush_work(&vkms_state->composer_work);
88         }
89
90         drm_atomic_helper_cleanup_planes(dev, old_state);
91 }
92
93 static int vkms_config_show(struct seq_file *m, void *data)
94 {
95         struct drm_debugfs_entry *entry = m->private;
96         struct drm_device *dev = entry->dev;
97         struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
98
99         seq_printf(m, "writeback=%d\n", vkmsdev->config->writeback);
100         seq_printf(m, "cursor=%d\n", vkmsdev->config->cursor);
101         seq_printf(m, "overlay=%d\n", vkmsdev->config->overlay);
102
103         return 0;
104 }
105
106 static const struct drm_debugfs_info vkms_config_debugfs_list[] = {
107         { "vkms_config", vkms_config_show, 0 },
108 };
109
110 static const struct drm_driver vkms_driver = {
111         .driver_features        = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
112         .release                = vkms_release,
113         .fops                   = &vkms_driver_fops,
114         DRM_GEM_SHMEM_DRIVER_OPS,
115
116         .name                   = DRIVER_NAME,
117         .desc                   = DRIVER_DESC,
118         .date                   = DRIVER_DATE,
119         .major                  = DRIVER_MAJOR,
120         .minor                  = DRIVER_MINOR,
121 };
122
123 static const struct drm_mode_config_funcs vkms_mode_funcs = {
124         .fb_create = drm_gem_fb_create,
125         .atomic_check = drm_atomic_helper_check,
126         .atomic_commit = drm_atomic_helper_commit,
127 };
128
129 static const struct drm_mode_config_helper_funcs vkms_mode_config_helpers = {
130         .atomic_commit_tail = vkms_atomic_commit_tail,
131 };
132
133 static int vkms_modeset_init(struct vkms_device *vkmsdev)
134 {
135         struct drm_device *dev = &vkmsdev->drm;
136         int ret;
137
138         ret = drmm_mode_config_init(dev);
139         if (ret)
140                 return ret;
141
142         dev->mode_config.funcs = &vkms_mode_funcs;
143         dev->mode_config.min_width = XRES_MIN;
144         dev->mode_config.min_height = YRES_MIN;
145         dev->mode_config.max_width = XRES_MAX;
146         dev->mode_config.max_height = YRES_MAX;
147         dev->mode_config.cursor_width = 512;
148         dev->mode_config.cursor_height = 512;
149         /* FIXME: There's a confusion between bpp and depth between this and
150          * fbdev helpers. We have to go with 0, meaning "pick the default",
151          * which ix XRGB8888 in all cases. */
152         dev->mode_config.preferred_depth = 0;
153         dev->mode_config.helper_private = &vkms_mode_config_helpers;
154
155         return vkms_output_init(vkmsdev, 0);
156 }
157
158 static int vkms_create(struct vkms_config *config)
159 {
160         int ret;
161         struct platform_device *pdev;
162         struct vkms_device *vkms_device;
163
164         pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
165         if (IS_ERR(pdev))
166                 return PTR_ERR(pdev);
167
168         if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
169                 ret = -ENOMEM;
170                 goto out_unregister;
171         }
172
173         vkms_device = devm_drm_dev_alloc(&pdev->dev, &vkms_driver,
174                                          struct vkms_device, drm);
175         if (IS_ERR(vkms_device)) {
176                 ret = PTR_ERR(vkms_device);
177                 goto out_devres;
178         }
179         vkms_device->platform = pdev;
180         vkms_device->config = config;
181         config->dev = vkms_device;
182
183         ret = dma_coerce_mask_and_coherent(vkms_device->drm.dev,
184                                            DMA_BIT_MASK(64));
185
186         if (ret) {
187                 DRM_ERROR("Could not initialize DMA support\n");
188                 goto out_devres;
189         }
190
191         ret = drm_vblank_init(&vkms_device->drm, 1);
192         if (ret) {
193                 DRM_ERROR("Failed to vblank\n");
194                 goto out_devres;
195         }
196
197         ret = vkms_modeset_init(vkms_device);
198         if (ret)
199                 goto out_devres;
200
201         drm_debugfs_add_files(&vkms_device->drm, vkms_config_debugfs_list,
202                               ARRAY_SIZE(vkms_config_debugfs_list));
203
204         ret = drm_dev_register(&vkms_device->drm, 0);
205         if (ret)
206                 goto out_devres;
207
208         drm_fbdev_generic_setup(&vkms_device->drm, 0);
209
210         return 0;
211
212 out_devres:
213         devres_release_group(&pdev->dev, NULL);
214 out_unregister:
215         platform_device_unregister(pdev);
216         return ret;
217 }
218
219 static int __init vkms_init(void)
220 {
221         int ret;
222         struct vkms_config *config;
223
224         config = kmalloc(sizeof(*config), GFP_KERNEL);
225         if (!config)
226                 return -ENOMEM;
227
228         default_config = config;
229
230         config->cursor = enable_cursor;
231         config->writeback = enable_writeback;
232         config->overlay = enable_overlay;
233
234         ret = vkms_create(config);
235         if (ret)
236                 kfree(config);
237
238         return ret;
239 }
240
241 static void vkms_destroy(struct vkms_config *config)
242 {
243         struct platform_device *pdev;
244
245         if (!config->dev) {
246                 DRM_INFO("vkms_device is NULL.\n");
247                 return;
248         }
249
250         pdev = config->dev->platform;
251
252         drm_dev_unregister(&config->dev->drm);
253         drm_atomic_helper_shutdown(&config->dev->drm);
254         devres_release_group(&pdev->dev, NULL);
255         platform_device_unregister(pdev);
256
257         config->dev = NULL;
258 }
259
260 static void __exit vkms_exit(void)
261 {
262         if (default_config->dev)
263                 vkms_destroy(default_config);
264
265         kfree(default_config);
266 }
267
268 module_init(vkms_init);
269 module_exit(vkms_exit);
270
271 MODULE_AUTHOR("Haneen Mohammed <[email protected]>");
272 MODULE_AUTHOR("Rodrigo Siqueira <[email protected]>");
273 MODULE_DESCRIPTION(DRIVER_DESC);
274 MODULE_LICENSE("GPL");
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