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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/gpu/drm/vkms/vkms_drv.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_drv.c')
-rw-r--r--drivers/gpu/drm/vkms/vkms_drv.c275
1 files changed, 275 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 000000000..f716c5796
--- /dev/null
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -0,0 +1,275 @@
+// 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"
+
+#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_info_node *node = (struct drm_info_node *)m->private;
+ struct drm_device *dev = node->minor->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_info_list vkms_config_debugfs_list[] = {
+ { "vkms_config", vkms_config_show, 0 },
+};
+
+static void vkms_config_debugfs_init(struct drm_minor *minor)
+{
+ drm_debugfs_create_files(vkms_config_debugfs_list, ARRAY_SIZE(vkms_config_debugfs_list),
+ minor->debugfs_root, minor);
+}
+
+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,
+
+ .debugfs_init = vkms_config_debugfs_init,
+
+ .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;
+
+ 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");