171 lines
4.2 KiB
C
171 lines
4.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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/**
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* DOC: vkms (Virtual Kernel Modesetting)
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*
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* vkms is a software-only model of a kms driver that is useful for testing,
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* or for running X (or similar) on headless machines and be able to still
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* use the GPU. vkms aims to enable a virtual display without the need for
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* a hardware display capability.
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*/
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#include <linux/module.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_fb_helper.h>
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#include "vkms_drv.h"
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#define DRIVER_NAME "vkms"
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#define DRIVER_DESC "Virtual Kernel Mode Setting"
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#define DRIVER_DATE "20180514"
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#define DRIVER_MAJOR 1
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#define DRIVER_MINOR 0
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static struct vkms_device *vkms_device;
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bool enable_cursor;
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module_param_named(enable_cursor, enable_cursor, bool, 0444);
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MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support");
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static const struct file_operations vkms_driver_fops = {
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.owner = THIS_MODULE,
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.open = drm_open,
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.mmap = drm_gem_mmap,
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.unlocked_ioctl = drm_ioctl,
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.compat_ioctl = drm_compat_ioctl,
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.poll = drm_poll,
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.read = drm_read,
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.llseek = no_llseek,
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.release = drm_release,
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};
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static const struct vm_operations_struct vkms_gem_vm_ops = {
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.fault = vkms_gem_fault,
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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static void vkms_release(struct drm_device *dev)
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{
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struct vkms_device *vkms = container_of(dev, struct vkms_device, drm);
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platform_device_unregister(vkms->platform);
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drm_atomic_helper_shutdown(&vkms->drm);
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drm_mode_config_cleanup(&vkms->drm);
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drm_dev_fini(&vkms->drm);
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destroy_workqueue(vkms->output.crc_workq);
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}
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static struct drm_driver vkms_driver = {
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.driver_features = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
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.release = vkms_release,
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.fops = &vkms_driver_fops,
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.dumb_create = vkms_dumb_create,
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.dumb_map_offset = vkms_dumb_map,
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.gem_vm_ops = &vkms_gem_vm_ops,
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.gem_free_object_unlocked = vkms_gem_free_object,
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.get_vblank_timestamp = vkms_get_vblank_timestamp,
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.name = DRIVER_NAME,
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.desc = DRIVER_DESC,
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.date = DRIVER_DATE,
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.major = DRIVER_MAJOR,
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.minor = DRIVER_MINOR,
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};
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static const struct drm_mode_config_funcs vkms_mode_funcs = {
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.fb_create = drm_gem_fb_create,
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.atomic_check = drm_atomic_helper_check,
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.atomic_commit = drm_atomic_helper_commit,
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};
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static int vkms_modeset_init(struct vkms_device *vkmsdev)
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{
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struct drm_device *dev = &vkmsdev->drm;
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drm_mode_config_init(dev);
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dev->mode_config.funcs = &vkms_mode_funcs;
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dev->mode_config.min_width = XRES_MIN;
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dev->mode_config.min_height = YRES_MIN;
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dev->mode_config.max_width = XRES_MAX;
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dev->mode_config.max_height = YRES_MAX;
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return vkms_output_init(vkmsdev);
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}
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static int __init vkms_init(void)
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{
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int ret;
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vkms_device = kzalloc(sizeof(*vkms_device), GFP_KERNEL);
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if (!vkms_device)
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return -ENOMEM;
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ret = drm_dev_init(&vkms_device->drm, &vkms_driver, NULL);
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if (ret)
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goto out_free;
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vkms_device->platform =
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platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
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if (IS_ERR(vkms_device->platform)) {
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ret = PTR_ERR(vkms_device->platform);
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goto out_fini;
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}
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vkms_device->drm.irq_enabled = true;
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ret = drm_vblank_init(&vkms_device->drm, 1);
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if (ret) {
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DRM_ERROR("Failed to vblank\n");
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goto out_fini;
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}
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ret = vkms_modeset_init(vkms_device);
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if (ret)
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goto out_unregister;
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ret = drm_dev_register(&vkms_device->drm, 0);
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if (ret)
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goto out_unregister;
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return 0;
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out_unregister:
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platform_device_unregister(vkms_device->platform);
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out_fini:
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drm_dev_fini(&vkms_device->drm);
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out_free:
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kfree(vkms_device);
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return ret;
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}
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static void __exit vkms_exit(void)
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{
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if (!vkms_device) {
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DRM_INFO("vkms_device is NULL.\n");
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return;
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}
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drm_dev_unregister(&vkms_device->drm);
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drm_dev_put(&vkms_device->drm);
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kfree(vkms_device);
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}
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module_init(vkms_init);
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module_exit(vkms_exit);
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MODULE_AUTHOR("Haneen Mohammed <hamohammed.sa@gmail.com>");
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MODULE_AUTHOR("Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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