1 files changed, 287 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
new file mode 100644
index 000000000000..dd1402f43773
--- /dev/null
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -0,0 +1,287 @@
+// 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/device/faux.h>
+#include <linux/dma-mapping.h>
+
+#include <drm/clients/drm_client_setup.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_shmem.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_print.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "vkms_config.h"
+#include "vkms_configfs.h"
+#include "vkms_drv.h"
+
+#define DRIVER_NAME	"vkms"
+#define DRIVER_DESC	"Virtual Kernel Mode Setting"
+#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");
+
+static bool enable_plane_pipeline;
+module_param_named(enable_plane_pipeline, enable_plane_pipeline, bool, 0444);
+MODULE_PARM_DESC(enable_plane_pipeline, "Enable/Disable plane pipeline support");
+
+static bool create_default_dev = true;
+module_param_named(create_default_dev, create_default_dev, bool, 0444);
+MODULE_PARM_DESC(create_default_dev, "Create or not the default VKMS device");
+
+DEFINE_DRM_GEM_FOPS(vkms_driver_fops);
+
+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,
+	.fops			= &vkms_driver_fops,
+	DRM_GEM_SHMEM_DRIVER_OPS,
+	DRM_FBDEV_SHMEM_DRIVER_OPS,
+
+	.name			= DRIVER_NAME,
+	.desc			= DRIVER_DESC,
+	.major			= DRIVER_MAJOR,
+	.minor			= DRIVER_MINOR,
+};
+
+static int vkms_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
+{
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *new_crtc_state;
+	int i;
+
+	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
+		if (!new_crtc_state->gamma_lut || !new_crtc_state->color_mgmt_changed)
+			continue;
+
+		if (new_crtc_state->gamma_lut->length / sizeof(struct drm_color_lut *)
+		    > VKMS_LUT_SIZE)
+			return -EINVAL;
+	}
+
+	return drm_atomic_helper_check(dev, state);
+}
+
+static const struct drm_mode_config_funcs vkms_mode_funcs = {
+	.fb_create = drm_gem_fb_create,
+	.atomic_check = vkms_atomic_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;
+	int ret;
+
+	ret = drmm_mode_config_init(dev);
+	if (ret)
+		return ret;
+
+	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 is XRGB8888 in all cases.
+	 */
+	dev->mode_config.preferred_depth = 0;
+	dev->mode_config.helper_private = &vkms_mode_config_helpers;
+
+	return vkms_output_init(vkmsdev);
+}
+
+int vkms_create(struct vkms_config *config)
+{
+	int ret;
+	struct faux_device *fdev;
+	struct vkms_device *vkms_device;
+	const char *dev_name;
+
+	dev_name = vkms_config_get_device_name(config);
+	fdev = faux_device_create(dev_name, NULL, NULL);
+	if (!fdev)
+		return -ENODEV;
+
+	if (!devres_open_group(&fdev->dev, NULL, GFP_KERNEL)) {
+		ret = -ENOMEM;
+		goto out_unregister;
+	}
+
+	vkms_device = devm_drm_dev_alloc(&fdev->dev, &vkms_driver,
+					 struct vkms_device, drm);
+	if (IS_ERR(vkms_device)) {
+		ret = PTR_ERR(vkms_device);
+		goto out_devres;
+	}
+	vkms_device->faux_dev = fdev;
+	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,
+			      vkms_config_get_num_crtcs(config));
+	if (ret) {
+		DRM_ERROR("Failed to vblank\n");
+		goto out_devres;
+	}
+
+	ret = vkms_modeset_init(vkms_device);
+	if (ret)
+		goto out_devres;
+
+	vkms_config_register_debugfs(vkms_device);
+
+	ret = drm_dev_register(&vkms_device->drm, 0);
+	if (ret)
+		goto out_devres;
+
+	drm_client_setup(&vkms_device->drm, NULL);
+
+	return 0;
+
+out_devres:
+	devres_release_group(&fdev->dev, NULL);
+out_unregister:
+	faux_device_destroy(fdev);
+	return ret;
+}
+
+static int __init vkms_init(void)
+{
+	int ret;
+	struct vkms_config *config;
+
+	ret = vkms_configfs_register();
+	if (ret)
+		return ret;
+
+	if (!create_default_dev)
+		return 0;
+
+	config = vkms_config_default_create(enable_cursor, enable_writeback,
+					    enable_overlay, enable_plane_pipeline);
+	if (IS_ERR(config))
+		return PTR_ERR(config);
+
+	ret = vkms_create(config);
+	if (ret) {
+		vkms_config_destroy(config);
+		return ret;
+	}
+
+	default_config = config;
+
+	return 0;
+}
+
+void vkms_destroy(struct vkms_config *config)
+{
+	struct faux_device *fdev;
+
+	if (!config->dev) {
+		DRM_INFO("vkms_device is NULL.\n");
+		return;
+	}
+
+	fdev = config->dev->faux_dev;
+
+	drm_colorop_pipeline_destroy(&config->dev->drm);
+	drm_dev_unregister(&config->dev->drm);
+	drm_atomic_helper_shutdown(&config->dev->drm);
+	devres_release_group(&fdev->dev, NULL);
+	faux_device_destroy(fdev);
+
+	config->dev = NULL;
+}
+
+static void __exit vkms_exit(void)
+{
+	vkms_configfs_unregister();
+
+	if (!default_config)
+		return;
+
+	vkms_destroy(default_config);
+	vkms_config_destroy(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");