This patch introduces Virtual Kernel Mode-Setting (VKMS) driver. It creates a very basic kms driver with 1 crtc/encoder/connector/plane.
VKMS driver would be useful for testing, or for running X (or similar) on headless machines and be able to still use the GPU. Thus it enables a virtual display without the need for hardware display capability.
Signed-off-by: Haneen Mohammed hamohammed.sa@gmail.com --- drivers/gpu/drm/Kconfig | 6 ++ drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/vkms/Makefile | 3 + drivers/gpu/drm/vkms/vkms_drv.c | 146 ++++++++++++++++++++++++++++++++ drivers/gpu/drm/vkms/vkms_drv.h | 13 +++ 5 files changed, 169 insertions(+) create mode 100644 drivers/gpu/drm/vkms/Makefile create mode 100644 drivers/gpu/drm/vkms/vkms_drv.c create mode 100644 drivers/gpu/drm/vkms/vkms_drv.h
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 2a72d2feb76d..7db3d82cbb27 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -213,6 +213,12 @@ config DRM_VGEM as used by Mesa's software renderer for enhanced performance. If M is selected the module will be called vgem.
+config DRM_VKMS + tristate "Virtual KMS" + depends on DRM + help + Choose this option to get a virtual kernal mode-setting driver. + If M is selected the module will be called vkms.
source "drivers/gpu/drm/exynos/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index ef9f3dab287f..8873d4769116 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -69,6 +69,7 @@ obj-$(CONFIG_DRM_SAVAGE)+= savage/ obj-$(CONFIG_DRM_VMWGFX)+= vmwgfx/ obj-$(CONFIG_DRM_VIA) +=via/ obj-$(CONFIG_DRM_VGEM) += vgem/ +obj-$(CONFIG_DRM_VKMS) += vkms/ obj-$(CONFIG_DRM_NOUVEAU) +=nouveau/ obj-$(CONFIG_DRM_EXYNOS) +=exynos/ obj-$(CONFIG_DRM_ROCKCHIP) +=rockchip/ diff --git a/drivers/gpu/drm/vkms/Makefile b/drivers/gpu/drm/vkms/Makefile new file mode 100644 index 000000000000..2aef948d3a34 --- /dev/null +++ b/drivers/gpu/drm/vkms/Makefile @@ -0,0 +1,3 @@ +vkms-y := vkms_drv.o + +obj-$(CONFIG_DRM_VKMS) += vkms.o diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c new file mode 100644 index 000000000000..b1df08ed23a0 --- /dev/null +++ b/drivers/gpu/drm/vkms/vkms_drv.c @@ -0,0 +1,146 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/module.h> +#include <drm/drmP.h> +#include <drm/drm_gem.h> +#include <drm/drm_crtc_helper.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_device *vkms_device; + +static const struct file_operations vkms_driver_fops = { + .owner = THIS_MODULE, + .open = drm_open, + .mmap = drm_gem_mmap, + .unlocked_ioctl = drm_ioctl, + .compat_ioctl = drm_compat_ioctl, + .poll = drm_poll, + .read = drm_read, + .llseek = no_llseek, + .release = drm_release, +}; + +static void vkms_release(struct drm_device *dev) +{ + struct vkms_device *vkms = container_of(dev, struct vkms_device, drm); + + platform_device_unregister(vkms->platform); + drm_mode_config_cleanup(&vkms->drm); + drm_dev_fini(&vkms->drm); +} + +struct drm_driver vkms_driver = { + .driver_features = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM, + .release = vkms_release, + .fops = &vkms_driver_fops, + + .name = DRIVER_NAME, + .desc = DRIVER_DESC, + .date = DRIVER_DATE, + .major = DRIVER_MAJOR, + .minor = DRIVER_MINOR, +}; + +static const u32 vkms_formats[] = { + DRM_FORMAT_XRGB8888, +}; + +static void vkms_connector_destroy(struct drm_connector *connector) +{ + drm_connector_unregister(connector); + drm_connector_cleanup(connector); +} + +static const struct drm_connector_funcs vkms_connector_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = vkms_connector_destroy, +}; + +static int __init vkms_init(void) +{ + int ret; + + vkms_device = kzalloc(sizeof(*vkms_device), GFP_KERNEL); + if (!vkms_device) + return -ENOMEM; + + ret = drm_dev_init(&vkms_device->drm, &vkms_driver, NULL); + if (ret) + goto out_free; + + vkms_device->platform = + platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); + if (IS_ERR(vkms_device->platform)) { + ret = PTR_ERR(vkms_device->platform); + goto out_fini; + } + + drm_mode_config_init(&vkms_device->drm); + + ret = drm_connector_init(&vkms_device->drm, &vkms_device->connector, + &vkms_connector_funcs, + DRM_MODE_CONNECTOR_VIRTUAL); + if (ret < 0) { + DRM_ERROR("Failed to init connector\n"); + goto out_unregister; + } + + ret = drm_simple_display_pipe_init(&vkms_device->drm, + &vkms_device->pipe, + NULL, + vkms_formats, + ARRAY_SIZE(vkms_formats), + NULL, + &vkms_device->connector); + if (ret < 0) { + DRM_ERROR("Cannot setup simple display pipe\n"); + goto out_unregister; + } + + ret = drm_dev_register(&vkms_device->drm, 0); + if (ret) + goto out_unregister; + + drm_connector_register(&vkms_device->connector); + + return 0; + +out_unregister: + platform_device_unregister(vkms_device->platform); +out_fini: + drm_dev_fini(&vkms_device->drm); +out_free: + kfree(vkms_device); + + return ret; +} + +static void __exit vkms_exit(void) +{ + if (!vkms_device) { + DRM_INFO("vkms_device is NULL.\n"); + return; + } + + drm_dev_unregister(&vkms_device->drm); + drm_dev_put(&vkms_device->drm); + + kfree(vkms_device); +} + +module_init(vkms_init); +module_exit(vkms_exit); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h new file mode 100644 index 000000000000..c77c5bf5032a --- /dev/null +++ b/drivers/gpu/drm/vkms/vkms_drv.h @@ -0,0 +1,13 @@ +#ifndef _VKMS_DRV_H_ +#define _VKMS_DRV_H_ + +#include <drm/drm_simple_kms_helper.h> + +struct vkms_device { + struct drm_device drm; + struct platform_device *platform; + struct drm_simple_display_pipe pipe; + struct drm_connector connector; +}; + +#endif /* _VKMS_DRV_H_ */