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// 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_fb_helper.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"
#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 = container_of(dev, struct vkms_device, drm);
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 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;
}
vkms_device->drm.irq_enabled = true;
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;
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)
{
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;
return vkms_create(config);
}
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");
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