Add virtio gpu driver.

This patch adds a kms driver for the virtio gpu.  The xorg modesetting
driver can handle the device just fine, the framebuffer for fbcon is
there too.

Qemu patches for the host side are under review currently.

The pci version of the device comes in two variants: with and without
vga compatibility.  The former has a extra memory bar for the vga
framebuffer, the later is a pure virtio device.  The only concern for
this driver is that in the virtio-vga case we have to kick out the
firmware framebuffer.

Initial revision has only 2d support, 3d (virgl) support requires
some more work on the qemu side and will be added later.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 140 insertions, 0 deletions

diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
new file mode 100644
index 000000000000..cfa0d27150bd
--- /dev/null
+++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
@@ -0,0 +1,140 @@
+/*
+ * 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 <drm/drmP.h>
+#include "virtgpu_drv.h"
+
+void virtio_gpu_gem_free_object(struct drm_gem_object *gem_obj)
+{
+	struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(gem_obj);
+
+	if (obj)
+		virtio_gpu_object_unref(&obj);
+}
+
+struct virtio_gpu_object *virtio_gpu_alloc_object(struct drm_device *dev,
+						  size_t size, bool kernel,
+						  bool pinned)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct virtio_gpu_object *obj;
+	int ret;
+
+	ret = virtio_gpu_object_create(vgdev, size, kernel, pinned, &obj);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return obj;
+}
+
+int virtio_gpu_gem_create(struct drm_file *file,
+			  struct drm_device *dev,
+			  uint64_t size,
+			  struct drm_gem_object **obj_p,
+			  uint32_t *handle_p)
+{
+	struct virtio_gpu_object *obj;
+	int ret;
+	u32 handle;
+
+	obj = virtio_gpu_alloc_object(dev, size, false, false);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+
+	ret = drm_gem_handle_create(file, &obj->gem_base, &handle);
+	if (ret) {
+		drm_gem_object_release(&obj->gem_base);
+		return ret;
+	}
+
+	*obj_p = &obj->gem_base;
+
+	/* drop reference from allocate - handle holds it now */
+	drm_gem_object_unreference_unlocked(&obj->gem_base);
+
+	*handle_p = handle;
+	return 0;
+}
+
+int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
+				struct drm_device *dev,
+				struct drm_mode_create_dumb *args)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct drm_gem_object *gobj;
+	struct virtio_gpu_object *obj;
+	int ret;
+	uint32_t pitch;
+	uint32_t resid;
+
+	pitch = args->width * ((args->bpp + 1) / 8);
+	args->size = pitch * args->height;
+	args->size = ALIGN(args->size, PAGE_SIZE);
+
+	ret = virtio_gpu_gem_create(file_priv, dev, args->size, &gobj,
+				    &args->handle);
+	if (ret)
+		goto fail;
+
+	virtio_gpu_resource_id_get(vgdev, &resid);
+	virtio_gpu_cmd_create_resource(vgdev, resid,
+				       2, args->width, args->height);
+
+	/* attach the object to the resource */
+	obj = gem_to_virtio_gpu_obj(gobj);
+	ret = virtio_gpu_object_attach(vgdev, obj, resid, NULL);
+	if (ret)
+		goto fail;
+
+	obj->dumb = true;
+	args->pitch = pitch;
+	return ret;
+
+fail:
+	return ret;
+}
+
+int virtio_gpu_mode_dumb_destroy(struct drm_file *file_priv,
+				 struct drm_device *dev,
+				 uint32_t handle)
+{
+	return drm_gem_handle_delete(file_priv, handle);
+}
+
+int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
+			      struct drm_device *dev,
+			      uint32_t handle, uint64_t *offset_p)
+{
+	struct drm_gem_object *gobj;
+	struct virtio_gpu_object *obj;
+	BUG_ON(!offset_p);
+	gobj = drm_gem_object_lookup(dev, file_priv, handle);
+	if (gobj == NULL)
+		return -ENOENT;
+	obj = gem_to_virtio_gpu_obj(gobj);
+	*offset_p = virtio_gpu_object_mmap_offset(obj);
+	drm_gem_object_unreference_unlocked(gobj);
+	return 0;
+}