drm: move i915_kick_out_vgacon to vgaarb

Also rename it to vga_remove_vgacon and add kerneldoc text.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20190301092502.30948-2-kraxel@redhat.com

1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index dc8e039bfab5..f2f3ef8af271 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -48,6 +48,8 @@
 #include <linux/miscdevice.h>
 #include <linux/slab.h>
 #include <linux/screen_info.h>
+#include <linux/vt.h>
+#include <linux/console.h>
 
 #include <linux/uaccess.h>
 
@@ -168,6 +170,53 @@ void vga_set_default_device(struct pci_dev *pdev)
 	vga_default = pci_dev_get(pdev);
 }
 
+/**
+ * vga_remove_vgacon - deactivete vga console
+ *
+ * Unbind and unregister vgacon in case pdev is the default vga
+ * device.  Can be called by gpu drivers on initialization to make
+ * sure vga register access done by vgacon will not disturb the
+ * device.
+ *
+ * @pdev: pci device.
+ */
+#if !defined(CONFIG_VGA_CONSOLE)
+int vga_remove_vgacon(struct pci_dev *pdev)
+{
+	return 0;
+}
+#elif !defined(CONFIG_DUMMY_CONSOLE)
+int vga_remove_vgacon(struct pci_dev *pdev)
+{
+	return -ENODEV;
+}
+#else
+int vga_remove_vgacon(struct pci_dev *pdev)
+{
+	int ret = 0;
+
+	if (pdev != vga_default)
+		return 0;
+	vgaarb_info(&pdev->dev, "deactivate vga console\n");
+
+	console_lock();
+	if (con_is_bound(&vga_con))
+		ret = do_take_over_console(&dummy_con, 0,
+					   MAX_NR_CONSOLES - 1, 1);
+	if (ret == 0) {
+		ret = do_unregister_con_driver(&vga_con);
+
+		/* Ignore "already unregistered". */
+		if (ret == -ENODEV)
+			ret = 0;
+	}
+	console_unlock();
+
+	return ret;
+}
+#endif
+EXPORT_SYMBOL(vga_remove_vgacon);
+
 static inline void vga_irq_set_state(struct vga_device *vgadev, bool state)
 {
 	if (vgadev->irq_set_state)