1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 */ 7 8 /** 9 * DOC: vkms (Virtual Kernel Modesetting) 10 * 11 * vkms is a software-only model of a kms driver that is useful for testing, 12 * or for running X (or similar) on headless machines and be able to still 13 * use the GPU. vkms aims to enable a virtual display without the need for 14 * a hardware display capability. 15 */ 16 17 #include <linux/module.h> 18 #include <drm/drm_gem.h> 19 #include <drm/drm_crtc_helper.h> 20 #include <drm/drm_atomic_helper.h> 21 #include <drm/drm_gem_framebuffer_helper.h> 22 #include <drm/drm_fb_helper.h> 23 #include "vkms_drv.h" 24 25 #define DRIVER_NAME "vkms" 26 #define DRIVER_DESC "Virtual Kernel Mode Setting" 27 #define DRIVER_DATE "20180514" 28 #define DRIVER_MAJOR 1 29 #define DRIVER_MINOR 0 30 31 static struct vkms_device *vkms_device; 32 33 bool enable_cursor; 34 module_param_named(enable_cursor, enable_cursor, bool, 0444); 35 MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support"); 36 37 static const struct file_operations vkms_driver_fops = { 38 .owner = THIS_MODULE, 39 .open = drm_open, 40 .mmap = drm_gem_mmap, 41 .unlocked_ioctl = drm_ioctl, 42 .compat_ioctl = drm_compat_ioctl, 43 .poll = drm_poll, 44 .read = drm_read, 45 .llseek = no_llseek, 46 .release = drm_release, 47 }; 48 49 static const struct vm_operations_struct vkms_gem_vm_ops = { 50 .fault = vkms_gem_fault, 51 .open = drm_gem_vm_open, 52 .close = drm_gem_vm_close, 53 }; 54 55 static void vkms_release(struct drm_device *dev) 56 { 57 struct vkms_device *vkms = container_of(dev, struct vkms_device, drm); 58 59 platform_device_unregister(vkms->platform); 60 drm_atomic_helper_shutdown(&vkms->drm); 61 drm_mode_config_cleanup(&vkms->drm); 62 drm_dev_fini(&vkms->drm); 63 destroy_workqueue(vkms->output.crc_workq); 64 } 65 66 static struct drm_driver vkms_driver = { 67 .driver_features = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM, 68 .release = vkms_release, 69 .fops = &vkms_driver_fops, 70 .dumb_create = vkms_dumb_create, 71 .gem_vm_ops = &vkms_gem_vm_ops, 72 .gem_free_object_unlocked = vkms_gem_free_object, 73 .get_vblank_timestamp = vkms_get_vblank_timestamp, 74 75 .name = DRIVER_NAME, 76 .desc = DRIVER_DESC, 77 .date = DRIVER_DATE, 78 .major = DRIVER_MAJOR, 79 .minor = DRIVER_MINOR, 80 }; 81 82 static const struct drm_mode_config_funcs vkms_mode_funcs = { 83 .fb_create = drm_gem_fb_create, 84 .atomic_check = drm_atomic_helper_check, 85 .atomic_commit = drm_atomic_helper_commit, 86 }; 87 88 static int vkms_modeset_init(struct vkms_device *vkmsdev) 89 { 90 struct drm_device *dev = &vkmsdev->drm; 91 92 drm_mode_config_init(dev); 93 dev->mode_config.funcs = &vkms_mode_funcs; 94 dev->mode_config.min_width = XRES_MIN; 95 dev->mode_config.min_height = YRES_MIN; 96 dev->mode_config.max_width = XRES_MAX; 97 dev->mode_config.max_height = YRES_MAX; 98 dev->mode_config.preferred_depth = 24; 99 100 return vkms_output_init(vkmsdev); 101 } 102 103 static int __init vkms_init(void) 104 { 105 int ret; 106 107 vkms_device = kzalloc(sizeof(*vkms_device), GFP_KERNEL); 108 if (!vkms_device) 109 return -ENOMEM; 110 111 vkms_device->platform = 112 platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); 113 if (IS_ERR(vkms_device->platform)) { 114 ret = PTR_ERR(vkms_device->platform); 115 goto out_free; 116 } 117 118 ret = drm_dev_init(&vkms_device->drm, &vkms_driver, 119 &vkms_device->platform->dev); 120 if (ret) 121 goto out_unregister; 122 123 vkms_device->drm.irq_enabled = true; 124 125 ret = drm_vblank_init(&vkms_device->drm, 1); 126 if (ret) { 127 DRM_ERROR("Failed to vblank\n"); 128 goto out_fini; 129 } 130 131 ret = vkms_modeset_init(vkms_device); 132 if (ret) 133 goto out_fini; 134 135 ret = drm_dev_register(&vkms_device->drm, 0); 136 if (ret) 137 goto out_fini; 138 139 return 0; 140 141 out_fini: 142 drm_dev_fini(&vkms_device->drm); 143 144 out_unregister: 145 platform_device_unregister(vkms_device->platform); 146 147 out_free: 148 kfree(vkms_device); 149 return ret; 150 } 151 152 static void __exit vkms_exit(void) 153 { 154 if (!vkms_device) { 155 DRM_INFO("vkms_device is NULL.\n"); 156 return; 157 } 158 159 drm_dev_unregister(&vkms_device->drm); 160 drm_dev_put(&vkms_device->drm); 161 162 kfree(vkms_device); 163 } 164 165 module_init(vkms_init); 166 module_exit(vkms_exit); 167 168 MODULE_AUTHOR("Haneen Mohammed <hamohammed.sa@gmail.com>"); 169 MODULE_AUTHOR("Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>"); 170 MODULE_DESCRIPTION(DRIVER_DESC); 171 MODULE_LICENSE("GPL"); 172