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