270 lines
6.8 KiB
C
270 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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* and for running X (or similar) on headless machines. VKMS aims to enable
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* a virtual display with no need of a hardware display capability, releasing
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* the GPU in DRM API tests.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_file.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_ioctl.h>
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#include <drm/drm_managed.h>
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#include <drm/drm_probe_helper.h>
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#include <drm/drm_gem_shmem_helper.h>
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#include <drm/drm_vblank.h>
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#include "vkms_drv.h"
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#include <drm/drm_print.h>
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#include <drm/drm_debugfs.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_config *default_config;
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static bool enable_cursor = true;
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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 bool enable_writeback = true;
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module_param_named(enable_writeback, enable_writeback, bool, 0444);
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MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector support");
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static bool enable_overlay;
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module_param_named(enable_overlay, enable_overlay, bool, 0444);
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MODULE_PARM_DESC(enable_overlay, "Enable/Disable overlay support");
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DEFINE_DRM_GEM_FOPS(vkms_driver_fops);
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static void vkms_release(struct drm_device *dev)
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{
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struct vkms_device *vkms = drm_device_to_vkms_device(dev);
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destroy_workqueue(vkms->output.composer_workq);
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}
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static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
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{
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struct drm_device *dev = old_state->dev;
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struct drm_crtc *crtc;
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struct drm_crtc_state *old_crtc_state;
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int i;
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drm_atomic_helper_commit_modeset_disables(dev, old_state);
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drm_atomic_helper_commit_planes(dev, old_state, 0);
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drm_atomic_helper_commit_modeset_enables(dev, old_state);
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drm_atomic_helper_fake_vblank(old_state);
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drm_atomic_helper_commit_hw_done(old_state);
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drm_atomic_helper_wait_for_flip_done(dev, old_state);
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for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
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struct vkms_crtc_state *vkms_state =
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to_vkms_crtc_state(old_crtc_state);
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flush_work(&vkms_state->composer_work);
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}
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drm_atomic_helper_cleanup_planes(dev, old_state);
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}
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static int vkms_config_show(struct seq_file *m, void *data)
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{
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struct drm_info_node *node = (struct drm_info_node *)m->private;
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struct drm_device *dev = node->minor->dev;
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struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
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seq_printf(m, "writeback=%d\n", vkmsdev->config->writeback);
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seq_printf(m, "cursor=%d\n", vkmsdev->config->cursor);
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seq_printf(m, "overlay=%d\n", vkmsdev->config->overlay);
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return 0;
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}
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static const struct drm_info_list vkms_config_debugfs_list[] = {
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{ "vkms_config", vkms_config_show, 0 },
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};
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static void vkms_config_debugfs_init(struct drm_minor *minor)
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{
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drm_debugfs_create_files(vkms_config_debugfs_list, ARRAY_SIZE(vkms_config_debugfs_list),
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minor->debugfs_root, minor);
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}
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static const 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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DRM_GEM_SHMEM_DRIVER_OPS,
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.debugfs_init = vkms_config_debugfs_init,
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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 const struct drm_mode_config_helper_funcs vkms_mode_config_helpers = {
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.atomic_commit_tail = vkms_atomic_commit_tail,
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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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dev->mode_config.cursor_width = 512;
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dev->mode_config.cursor_height = 512;
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/* FIXME: There's a confusion between bpp and depth between this and
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* fbdev helpers. We have to go with 0, meaning "pick the default",
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* which ix XRGB8888 in all cases. */
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dev->mode_config.preferred_depth = 0;
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dev->mode_config.helper_private = &vkms_mode_config_helpers;
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return vkms_output_init(vkmsdev, 0);
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}
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static int vkms_create(struct vkms_config *config)
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{
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int ret;
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struct platform_device *pdev;
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struct vkms_device *vkms_device;
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pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
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if (IS_ERR(pdev))
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return PTR_ERR(pdev);
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if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
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ret = -ENOMEM;
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goto out_unregister;
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}
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vkms_device = devm_drm_dev_alloc(&pdev->dev, &vkms_driver,
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struct vkms_device, drm);
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if (IS_ERR(vkms_device)) {
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ret = PTR_ERR(vkms_device);
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goto out_devres;
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}
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vkms_device->platform = pdev;
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vkms_device->config = config;
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config->dev = vkms_device;
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ret = dma_coerce_mask_and_coherent(vkms_device->drm.dev,
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DMA_BIT_MASK(64));
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if (ret) {
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DRM_ERROR("Could not initialize DMA support\n");
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goto out_devres;
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}
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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_devres;
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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_devres;
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ret = drm_dev_register(&vkms_device->drm, 0);
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if (ret)
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goto out_devres;
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drm_fbdev_generic_setup(&vkms_device->drm, 0);
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return 0;
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out_devres:
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devres_release_group(&pdev->dev, NULL);
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out_unregister:
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platform_device_unregister(pdev);
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return ret;
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}
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static int __init vkms_init(void)
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{
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struct vkms_config *config;
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config = kmalloc(sizeof(*config), GFP_KERNEL);
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if (!config)
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return -ENOMEM;
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default_config = config;
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config->cursor = enable_cursor;
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config->writeback = enable_writeback;
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config->overlay = enable_overlay;
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return vkms_create(config);
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}
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static void vkms_destroy(struct vkms_config *config)
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{
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struct platform_device *pdev;
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if (!config->dev) {
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DRM_INFO("vkms_device is NULL.\n");
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return;
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}
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pdev = config->dev->platform;
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drm_dev_unregister(&config->dev->drm);
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drm_atomic_helper_shutdown(&config->dev->drm);
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devres_release_group(&pdev->dev, NULL);
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platform_device_unregister(pdev);
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config->dev = NULL;
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}
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static void __exit vkms_exit(void)
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{
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if (default_config->dev)
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vkms_destroy(default_config);
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kfree(default_config);
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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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