1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
new file mode 100644
index 000000000000..88a39165edd5
--- /dev/null
+++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/pci.h>
+
+#include "virtgpu_drv.h"
+
+int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master)
+{
+	struct pci_dev *pdev = dev->pdev;
+
+	if (pdev) {
+		return drm_pci_set_busid(dev, master);
+	}
+	return 0;
+}
+
+static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
+{
+	struct apertures_struct *ap;
+	bool primary;
+
+	ap = alloc_apertures(1);
+	if (!ap)
+		return;
+
+	ap->ranges[0].base = pci_resource_start(pci_dev, 0);
+	ap->ranges[0].size = pci_resource_len(pci_dev, 0);
+
+	primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
+		& IORESOURCE_ROM_SHADOW;
+
+	remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
+
+	kfree(ap);
+}
+
+int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
+{
+	struct drm_device *dev;
+	int ret;
+
+	dev = drm_dev_alloc(driver, &vdev->dev);
+	if (!dev)
+		return -ENOMEM;
+	dev->virtdev = vdev;
+	vdev->priv = dev;
+
+	if (strcmp(vdev->dev.parent->bus->name, "pci") == 0) {
+		struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
+		bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
+
+		DRM_INFO("pci: %s detected\n",
+			 vga ? "virtio-vga" : "virtio-gpu-pci");
+		dev->pdev = pdev;
+		if (vga)
+			virtio_pci_kick_out_firmware_fb(pdev);
+	}
+
+	ret = drm_dev_register(dev, 0);
+	if (ret)
+		goto err_free;
+
+	DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
+		 driver->major, driver->minor, driver->patchlevel,
+		 driver->date, dev->primary->index);
+
+	return 0;
+
+err_free:
+	drm_dev_unref(dev);
+	return ret;
+}