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>

drivers/gpu/drm/Kconfig

@@ -206,6 +206,8 @@ source "drivers/gpu/drm/qxl/Kconfig"
 
 source "drivers/gpu/drm/bochs/Kconfig"
 
+source "drivers/gpu/drm/virtio/Kconfig"
+
 source "drivers/gpu/drm/msm/Kconfig"
 
 source "drivers/gpu/drm/tegra/Kconfig"

drivers/gpu/drm/Makefile

@@ -61,6 +61,7 @@ obj-$(CONFIG_DRM_OMAP)	+= omapdrm/
 obj-$(CONFIG_DRM_TILCDC)	+= tilcdc/
 obj-$(CONFIG_DRM_QXL) += qxl/
 obj-$(CONFIG_DRM_BOCHS) += bochs/
+obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/
 obj-$(CONFIG_DRM_MSM) += msm/
 obj-$(CONFIG_DRM_TEGRA) += tegra/
 obj-$(CONFIG_DRM_STI) += sti/

drivers/gpu/drm/virtio/Kconfig

+config DRM_VIRTIO_GPU
+	tristate "Virtio GPU driver"
+	depends on DRM && VIRTIO
+	select FB_SYS_FILLRECT
+	select FB_SYS_COPYAREA
+	select FB_SYS_IMAGEBLIT
+        select DRM_KMS_HELPER
+        select DRM_KMS_FB_HELPER
+        select DRM_TTM
+	help
+	   This is the virtual GPU driver for virtio.  It can be used with
+           QEMU based VMMs (like KVM or Xen).
+
+	   If unsure say M.

drivers/gpu/drm/virtio/Makefile

+#
+# Makefile for the drm device driver.  This driver provides support for the
+# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
+
+ccflags-y := -Iinclude/drm
+
+virtio-gpu-y := virtgpu_drv.o virtgpu_kms.o virtgpu_drm_bus.o virtgpu_gem.o \
+	virtgpu_fb.o virtgpu_display.o virtgpu_vq.o virtgpu_ttm.o \
+	virtgpu_fence.o virtgpu_object.o virtgpu_debugfs.o virtgpu_plane.o
+
+obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio-gpu.o

drivers/gpu/drm/virtio/virtgpu_debugfs.c

+/*
+ * 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/debugfs.h>
+
+#include "drmP.h"
+#include "virtgpu_drv.h"
+
+static int
+virtio_gpu_debugfs_irq_info(struct seq_file *m, void *data)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct virtio_gpu_device *vgdev = node->minor->dev->dev_private;
+
+	seq_printf(m, "fence %ld %lld\n",
+		   atomic64_read(&vgdev->fence_drv.last_seq),
+		   vgdev->fence_drv.sync_seq);
+	return 0;
+}
+
+static struct drm_info_list virtio_gpu_debugfs_list[] = {
+	{ "irq_fence", virtio_gpu_debugfs_irq_info, 0, NULL },
+};
+
+#define VIRTIO_GPU_DEBUGFS_ENTRIES ARRAY_SIZE(virtio_gpu_debugfs_list)
+
+int
+virtio_gpu_debugfs_init(struct drm_minor *minor)
+{
+	drm_debugfs_create_files(virtio_gpu_debugfs_list,
+				 VIRTIO_GPU_DEBUGFS_ENTRIES,
+				 minor->debugfs_root, minor);
+	return 0;
+}
+
+void
+virtio_gpu_debugfs_takedown(struct drm_minor *minor)
+{
+	drm_debugfs_remove_files(virtio_gpu_debugfs_list,
+				 VIRTIO_GPU_DEBUGFS_ENTRIES,
+				 minor);
+}

drivers/gpu/drm/virtio/virtgpu_display.c

+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * Authors:
+ *    Dave Airlie
+ *    Alon Levy
+ *
+ * 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 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 HOLDER(S) OR AUTHOR(S) 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 "virtgpu_drv.h"
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_atomic_helper.h>
+
+#define XRES_MIN   320
+#define YRES_MIN   200
+
+#define XRES_DEF  1024
+#define YRES_DEF   768
+
+#define XRES_MAX  8192
+#define YRES_MAX  8192
+
+static void virtio_gpu_crtc_gamma_set(struct drm_crtc *crtc,
+				      u16 *red, u16 *green, u16 *blue,
+				      uint32_t start, uint32_t size)
+{
+	/* TODO */
+}
+
+static void
+virtio_gpu_hide_cursor(struct virtio_gpu_device *vgdev,
+		       struct virtio_gpu_output *output)
+{
+	output->cursor.hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_UPDATE_CURSOR);
+	output->cursor.resource_id = 0;
+	virtio_gpu_cursor_ping(vgdev, output);
+}
+
+static int virtio_gpu_crtc_cursor_set(struct drm_crtc *crtc,
+				      struct drm_file *file_priv,
+				      uint32_t handle,
+				      uint32_t width,
+				      uint32_t height,
+				      int32_t hot_x, int32_t hot_y)
+{
+	struct virtio_gpu_device *vgdev = crtc->dev->dev_private;
+	struct virtio_gpu_output *output =
+		container_of(crtc, struct virtio_gpu_output, crtc);
+	struct drm_gem_object *gobj = NULL;
+	struct virtio_gpu_object *qobj = NULL;
+	struct virtio_gpu_fence *fence = NULL;
+	int ret = 0;
+
+	if (handle == 0) {
+		virtio_gpu_hide_cursor(vgdev, output);
+		return 0;
+	}
+
+	/* lookup the cursor */
+	gobj = drm_gem_object_lookup(crtc->dev, file_priv, handle);
+	if (gobj == NULL)
+		return -ENOENT;
+
+	qobj = gem_to_virtio_gpu_obj(gobj);
+
+	if (!qobj->hw_res_handle) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	virtio_gpu_cmd_transfer_to_host_2d(vgdev, qobj->hw_res_handle, 0,
+					   cpu_to_le32(64),
+					   cpu_to_le32(64),
+					   0, 0, &fence);
+
+	output->cursor.hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_UPDATE_CURSOR);
+	output->cursor.resource_id = cpu_to_le32(qobj->hw_res_handle);
+	output->cursor.hot_x = cpu_to_le32(hot_x);
+	output->cursor.hot_y = cpu_to_le32(hot_y);
+	virtio_gpu_cursor_ping(vgdev, output);
+	ret = 0;
+
+out:
+	drm_gem_object_unreference_unlocked(gobj);
+	return ret;
+}
+
+static int virtio_gpu_crtc_cursor_move(struct drm_crtc *crtc,
+				    int x, int y)
+{
+	struct virtio_gpu_device *vgdev = crtc->dev->dev_private;
+	struct virtio_gpu_output *output =
+		container_of(crtc, struct virtio_gpu_output, crtc);
+
+	output->cursor.hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_MOVE_CURSOR);
+	output->cursor.pos.x = cpu_to_le32(x);
+	output->cursor.pos.y = cpu_to_le32(y);
+	virtio_gpu_cursor_ping(vgdev, output);
+	return 0;
+}
+
+static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
+	.cursor_set2            = virtio_gpu_crtc_cursor_set,
+	.cursor_move            = virtio_gpu_crtc_cursor_move,
+	.gamma_set              = virtio_gpu_crtc_gamma_set,
+	.set_config             = drm_atomic_helper_set_config,
+	.destroy                = drm_crtc_cleanup,
+
+#if 0 /* not (yet) working without vblank support according to docs */
+	.page_flip              = drm_atomic_helper_page_flip,
+#endif
+	.reset                  = drm_atomic_helper_crtc_reset,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
+};
+
+static void virtio_gpu_user_framebuffer_destroy(struct drm_framebuffer *fb)
+{
+	struct virtio_gpu_framebuffer *virtio_gpu_fb
+		= to_virtio_gpu_framebuffer(fb);
+
+	if (virtio_gpu_fb->obj)
+		drm_gem_object_unreference_unlocked(virtio_gpu_fb->obj);
+	drm_framebuffer_cleanup(fb);
+	kfree(virtio_gpu_fb);
+}
+
+static int
+virtio_gpu_framebuffer_surface_dirty(struct drm_framebuffer *fb,
+				     struct drm_file *file_priv,
+				     unsigned flags, unsigned color,
+				     struct drm_clip_rect *clips,
+				     unsigned num_clips)
+{
+	struct virtio_gpu_framebuffer *virtio_gpu_fb
+		= to_virtio_gpu_framebuffer(fb);
+
+	return virtio_gpu_surface_dirty(virtio_gpu_fb, clips, num_clips);
+}
+
+static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
+	.destroy = virtio_gpu_user_framebuffer_destroy,
+	.dirty = virtio_gpu_framebuffer_surface_dirty,
+};
+
+int
+virtio_gpu_framebuffer_init(struct drm_device *dev,
+			    struct virtio_gpu_framebuffer *vgfb,
+			    struct drm_mode_fb_cmd2 *mode_cmd,
+			    struct drm_gem_object *obj)
+{
+	int ret;
+	struct virtio_gpu_object *bo;
+	vgfb->obj = obj;
+
+	bo = gem_to_virtio_gpu_obj(obj);
+
+	ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
+	if (ret) {
+		vgfb->obj = NULL;
+		return ret;
+	}
+	drm_helper_mode_fill_fb_struct(&vgfb->base, mode_cmd);
+
+	spin_lock_init(&vgfb->dirty_lock);
+	vgfb->x1 = vgfb->y1 = INT_MAX;
+	vgfb->x2 = vgfb->y2 = 0;
+	return 0;
+}
+
+static bool virtio_gpu_crtc_mode_fixup(struct drm_crtc *crtc,
+				       const struct drm_display_mode *mode,
+				       struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
+
+	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
+				   crtc->mode.hdisplay,
+				   crtc->mode.vdisplay, 0, 0);
+}
+
+static void virtio_gpu_crtc_enable(struct drm_crtc *crtc)
+{
+}
+
+static void virtio_gpu_crtc_disable(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
+
+	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
+}
+
+static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
+					struct drm_crtc_state *state)
+{
+	return 0;
+}
+
+static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
+	.enable        = virtio_gpu_crtc_enable,
+	.disable       = virtio_gpu_crtc_disable,
+	.mode_fixup    = virtio_gpu_crtc_mode_fixup,
+	.mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
+	.atomic_check  = virtio_gpu_crtc_atomic_check,
+};
+
+static bool virtio_gpu_enc_mode_fixup(struct drm_encoder *encoder,
+				      const struct drm_display_mode *mode,
+				      struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
+				    struct drm_display_mode *mode,
+				    struct drm_display_mode *adjusted_mode)
+{
+}
+
+static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
+{
+}
+
+static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
+{
+}
+
+static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
+{
+	struct virtio_gpu_output *output =
+		drm_connector_to_virtio_gpu_output(connector);
+	struct drm_display_mode *mode = NULL;
+	int count, width, height;
+
+	width  = le32_to_cpu(output->info.r.width);
+	height = le32_to_cpu(output->info.r.height);
+	count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
+
+	if (width == 0 || height == 0) {
+		width = XRES_DEF;
+		height = YRES_DEF;
+		drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
+	} else {
+		DRM_DEBUG("add mode: %dx%d\n", width, height);
+		mode = drm_cvt_mode(connector->dev, width, height, 60,
+				    false, false, false);
+		mode->type |= DRM_MODE_TYPE_PREFERRED;
+		drm_mode_probed_add(connector, mode);
+		count++;
+	}
+
+	return count;
+}
+
+static int virtio_gpu_conn_mode_valid(struct drm_connector *connector,
+				      struct drm_display_mode *mode)
+{
+	struct virtio_gpu_output *output =
+		drm_connector_to_virtio_gpu_output(connector);
+	int width, height;
+
+	width  = le32_to_cpu(output->info.r.width);
+	height = le32_to_cpu(output->info.r.height);
+
+	if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
+		return MODE_OK;
+	if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
+		return MODE_OK;
+	if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
+	    mode->vdisplay <= height && mode->vdisplay >= height - 16)
+		return MODE_OK;
+
+	DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
+	return MODE_BAD;
+}
+
+static struct drm_encoder*
+virtio_gpu_best_encoder(struct drm_connector *connector)
+{
+	struct virtio_gpu_output *virtio_gpu_output =
+		drm_connector_to_virtio_gpu_output(connector);
+
+	return &virtio_gpu_output->enc;
+}
+
+static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
+	.mode_fixup = virtio_gpu_enc_mode_fixup,
+	.mode_set   = virtio_gpu_enc_mode_set,
+	.enable     = virtio_gpu_enc_enable,
+	.disable    = virtio_gpu_enc_disable,
+};
+
+static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
+	.get_modes    = virtio_gpu_conn_get_modes,
+	.mode_valid   = virtio_gpu_conn_mode_valid,
+	.best_encoder = virtio_gpu_best_encoder,
+};
+
+static void virtio_gpu_conn_save(struct drm_connector *connector)
+{
+	DRM_DEBUG("\n");
+}
+
+static void virtio_gpu_conn_restore(struct drm_connector *connector)
+{
+	DRM_DEBUG("\n");
+}
+
+static enum drm_connector_status virtio_gpu_conn_detect(
+			struct drm_connector *connector,
+			bool force)
+{
+	struct virtio_gpu_output *output =
+		drm_connector_to_virtio_gpu_output(connector);
+
+	if (output->info.enabled)
+		return connector_status_connected;
+	else
+		return connector_status_disconnected;
+}
+
+static void virtio_gpu_conn_destroy(struct drm_connector *connector)
+{
+	struct virtio_gpu_output *virtio_gpu_output =
+		drm_connector_to_virtio_gpu_output(connector);
+
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+	kfree(virtio_gpu_output);
+}
+
+static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
+	.dpms = drm_atomic_helper_connector_dpms,
+	.save = virtio_gpu_conn_save,
+	.restore = virtio_gpu_conn_restore,
+	.detect = virtio_gpu_conn_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = virtio_gpu_conn_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
+{
+	struct drm_device *dev = vgdev->ddev;
+	struct virtio_gpu_output *output = vgdev->outputs + index;
+	struct drm_connector *connector = &output->conn;
+	struct drm_encoder *encoder = &output->enc;
+	struct drm_crtc *crtc = &output->crtc;
+	struct drm_plane *plane;
+
+	output->index = index;
+	if (index == 0) {
+		output->info.enabled = cpu_to_le32(true);
+		output->info.r.width = cpu_to_le32(XRES_DEF);
+		output->info.r.height = cpu_to_le32(YRES_DEF);
+	}
+
+	plane = virtio_gpu_plane_init(vgdev, index);
+	if (IS_ERR(plane))
+		return PTR_ERR(plane);
+	drm_crtc_init_with_planes(dev, crtc, plane, NULL,
+				  &virtio_gpu_crtc_funcs);
+	drm_mode_crtc_set_gamma_size(crtc, 256);
+	drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
+	plane->crtc = crtc;
+
+	drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
+			   DRM_MODE_CONNECTOR_VIRTUAL);
+	drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
+
+	drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
+			 DRM_MODE_ENCODER_VIRTUAL);
+	drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
+	encoder->possible_crtcs = 1 << index;
+
+	drm_mode_connector_attach_encoder(connector, encoder);
+	drm_connector_register(connector);
+	return 0;
+}
+
+static struct drm_framebuffer *
+virtio_gpu_user_framebuffer_create(struct drm_device *dev,
+				   struct drm_file *file_priv,
+				   struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	struct drm_gem_object *obj = NULL;
+	struct virtio_gpu_framebuffer *virtio_gpu_fb;
+	int ret;
+
+	/* lookup object associated with res handle */
+	obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
+	if (!obj)
+		return ERR_PTR(-EINVAL);
+
+	virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
+	if (virtio_gpu_fb == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
+	if (ret) {
+		kfree(virtio_gpu_fb);
+		if (obj)
+			drm_gem_object_unreference_unlocked(obj);
+		return NULL;
+	}
+
+	return &virtio_gpu_fb->base;
+}
+
+static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
+	.fb_create = virtio_gpu_user_framebuffer_create,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
+{
+	int i;
+
+	drm_mode_config_init(vgdev->ddev);
+	vgdev->ddev->mode_config.funcs = (void *)&virtio_gpu_mode_funcs;
+
+	/* modes will be validated against the framebuffer size */
+	vgdev->ddev->mode_config.min_width = XRES_MIN;
+	vgdev->ddev->mode_config.min_height = YRES_MIN;
+	vgdev->ddev->mode_config.max_width = XRES_MAX;
+	vgdev->ddev->mode_config.max_height = YRES_MAX;
+
+	for (i = 0 ; i < vgdev->num_scanouts; ++i)
+		vgdev_output_init(vgdev, i);
+
+        drm_mode_config_reset(vgdev->ddev);
+	return 0;
+}
+
+void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
+{
+	virtio_gpu_fbdev_fini(vgdev);
+	drm_mode_config_cleanup(vgdev->ddev);
+}

drivers/gpu/drm/virtio/virtgpu_drm_bus.c

+/*
+ * 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;
+}
+
+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;
+
+		if (vga) {
+			/*
+			 * Need to make sure we don't have two drivers
+			 * for the same hardware here.  Some day we
+			 * will simply kick out the firmware
+			 * (vesa/efi) framebuffer.
+			 *
+			 * Virtual hardware specs for virtio-vga are
+			 * not finalized yet, therefore we can't add
+			 * code for that yet.
+			 *
+			 * So ignore the device for the time being,
+			 * and suggest to the user use the device
+			 * variant without vga compatibility mode.
+			 */
+			DRM_ERROR("virtio-vga not (yet) supported\n");
+			DRM_ERROR("please use virtio-gpu-pci instead\n");
+			ret = -ENODEV;
+			goto err_free;
+		}
+		dev->pdev = 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;
+}

drivers/gpu/drm/virtio/virtgpu_drv.c

+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * Authors:
+ *    Dave Airlie <airlied@redhat.com>
+ *    Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * 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
+ * VA LINUX SYSTEMS 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/module.h>
+#include <linux/console.h>
+#include <linux/pci.h>
+#include "drmP.h"
+#include "drm/drm.h"
+
+#include "virtgpu_drv.h"
+static struct drm_driver driver;
+
+static int virtio_gpu_modeset = -1;
+
+MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
+module_param_named(modeset, virtio_gpu_modeset, int, 0400);
+
+static int virtio_gpu_probe(struct virtio_device *vdev)
+{
+#ifdef CONFIG_VGA_CONSOLE
+	if (vgacon_text_force() && virtio_gpu_modeset == -1)
+		return -EINVAL;
+#endif
+
+	if (virtio_gpu_modeset == 0)
+		return -EINVAL;
+
+	return drm_virtio_init(&driver, vdev);
+}
+
+static void virtio_gpu_remove(struct virtio_device *vdev)
+{
+	struct drm_device *dev = vdev->priv;
+	drm_put_dev(dev);
+}
+
+static void virtio_gpu_config_changed(struct virtio_device *vdev)
+{
+	struct drm_device *dev = vdev->priv;
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+
+	schedule_work(&vgdev->config_changed_work);
+}
+
+static struct virtio_device_id id_table[] = {
+	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
+	{ 0 },
+};
+
+static unsigned int features[] = {
+};
+static struct virtio_driver virtio_gpu_driver = {
+	.feature_table = features,
+	.feature_table_size = ARRAY_SIZE(features),
+	.driver.name = KBUILD_MODNAME,
+	.driver.owner = THIS_MODULE,
+	.id_table = id_table,
+	.probe = virtio_gpu_probe,
+	.remove = virtio_gpu_remove,
+	.config_changed = virtio_gpu_config_changed
+};
+
+module_virtio_driver(virtio_gpu_driver);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio GPU driver");
+MODULE_LICENSE("GPL and additional rights");
+MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
+MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
+MODULE_AUTHOR("Alon Levy");
+
+static const struct file_operations virtio_gpu_driver_fops = {
+	.owner = THIS_MODULE,
+	.open = drm_open,
+	.mmap = virtio_gpu_mmap,
+	.poll = drm_poll,
+	.read = drm_read,
+	.unlocked_ioctl	= drm_ioctl,
+	.release = drm_release,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = drm_compat_ioctl,
+#endif
+	.llseek = noop_llseek,
+};
+
+
+static struct drm_driver driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM,
+	.set_busid = drm_virtio_set_busid,
+	.load = virtio_gpu_driver_load,
+	.unload = virtio_gpu_driver_unload,
+
+	.dumb_create = virtio_gpu_mode_dumb_create,
+	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
+	.dumb_destroy = virtio_gpu_mode_dumb_destroy,
+
+#if defined(CONFIG_DEBUG_FS)
+	.debugfs_init = virtio_gpu_debugfs_init,
+	.debugfs_cleanup = virtio_gpu_debugfs_takedown,
+#endif
+
+	.gem_free_object = virtio_gpu_gem_free_object,
+	.fops = &virtio_gpu_driver_fops,
+
+	.name = DRIVER_NAME,
+	.desc = DRIVER_DESC,
+	.date = DRIVER_DATE,
+	.major = DRIVER_MAJOR,
+	.minor = DRIVER_MINOR,
+	.patchlevel = DRIVER_PATCHLEVEL,
+};

drivers/gpu/drm/virtio/virtgpu_drv.h

+/*
+ * 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.
+ */
+
+#ifndef VIRTIO_DRV_H
+#define VIRTIO_DRV_H
+
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_gpu.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_crtc_helper.h>
+#include <ttm/ttm_bo_api.h>
+#include <ttm/ttm_bo_driver.h>
+#include <ttm/ttm_placement.h>
+#include <ttm/ttm_module.h>
+
+#define DRIVER_NAME "virtio_gpu"
+#define DRIVER_DESC "virtio GPU"
+#define DRIVER_DATE "0"
+
+#define DRIVER_MAJOR 0
+#define DRIVER_MINOR 0
+#define DRIVER_PATCHLEVEL 1
+
+/* virtgpu_drm_bus.c */
+int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master);
+int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev);
+
+struct virtio_gpu_object {
+	struct drm_gem_object gem_base;
+	uint32_t hw_res_handle;
+
+	struct sg_table *pages;
+	void *vmap;
+	bool dumb;
+	struct ttm_place                placement_code;
+	struct ttm_placement		placement;
+	struct ttm_buffer_object	tbo;
+	struct ttm_bo_kmap_obj		kmap;
+};
+#define gem_to_virtio_gpu_obj(gobj) \
+	container_of((gobj), struct virtio_gpu_object, gem_base)
+
+struct virtio_gpu_vbuffer;
+struct virtio_gpu_device;
+
+typedef void (*virtio_gpu_resp_cb)(struct virtio_gpu_device *vgdev,
+				   struct virtio_gpu_vbuffer *vbuf);
+
+struct virtio_gpu_fence_driver {
+	atomic64_t       last_seq;
+	uint64_t         sync_seq;
+	struct list_head fences;
+	spinlock_t       lock;
+};
+
+struct virtio_gpu_fence {
+	struct fence f;
+	struct virtio_gpu_fence_driver *drv;
+	struct list_head node;
+	uint64_t seq;
+};
+#define to_virtio_fence(x) \
+	container_of(x, struct virtio_gpu_fence, f)
+
+struct virtio_gpu_vbuffer {
+	char *buf;
+	int size;
+
+	void *data_buf;
+	uint32_t data_size;
+
+	char *resp_buf;
+	int resp_size;
+
+	virtio_gpu_resp_cb resp_cb;
+
+	struct list_head list;
+};
+
+struct virtio_gpu_output {
+	int index;
+	struct drm_crtc crtc;
+	struct drm_connector conn;
+	struct drm_encoder enc;
+	struct virtio_gpu_display_one info;
+	struct virtio_gpu_update_cursor cursor;
+	int cur_x;
+	int cur_y;
+};
+#define drm_crtc_to_virtio_gpu_output(x) \
+	container_of(x, struct virtio_gpu_output, crtc)
+#define drm_connector_to_virtio_gpu_output(x) \
+	container_of(x, struct virtio_gpu_output, conn)
+#define drm_encoder_to_virtio_gpu_output(x) \
+	container_of(x, struct virtio_gpu_output, enc)
+
+struct virtio_gpu_framebuffer {
+	struct drm_framebuffer base;
+	struct drm_gem_object *obj;
+	int x1, y1, x2, y2; /* dirty rect */
+	spinlock_t dirty_lock;
+	uint32_t hw_res_handle;
+};
+#define to_virtio_gpu_framebuffer(x) \
+	container_of(x, struct virtio_gpu_framebuffer, base)
+
+struct virtio_gpu_mman {
+	struct ttm_bo_global_ref        bo_global_ref;
+	struct drm_global_reference	mem_global_ref;
+	bool				mem_global_referenced;
+	struct ttm_bo_device		bdev;
+};
+
+struct virtio_gpu_fbdev;
+
+struct virtio_gpu_queue {
+	struct virtqueue *vq;
+	spinlock_t qlock;
+	wait_queue_head_t ack_queue;
+	struct work_struct dequeue_work;
+};
+
+struct virtio_gpu_device {
+	struct device *dev;
+	struct drm_device *ddev;
+
+	struct virtio_device *vdev;
+
+	struct virtio_gpu_mman mman;
+
+	/* pointer to fbdev info structure */
+	struct virtio_gpu_fbdev *vgfbdev;
+	struct virtio_gpu_output outputs[VIRTIO_GPU_MAX_SCANOUTS];
+	uint32_t num_scanouts;
+
+	struct virtio_gpu_queue ctrlq;
+	struct virtio_gpu_queue cursorq;
+	struct list_head free_vbufs;
+	void *vbufs;
+	bool vqs_ready;
+
+	struct idr	resource_idr;
+	spinlock_t resource_idr_lock;
+
+	wait_queue_head_t resp_wq;
+	/* current display info */
+	spinlock_t display_info_lock;
+
+	struct virtio_gpu_fence_driver fence_drv;
+
+	struct idr	ctx_id_idr;
+	spinlock_t ctx_id_idr_lock;
+
+	struct work_struct config_changed_work;
+};
+
+struct virtio_gpu_fpriv {
+	uint32_t ctx_id;
+};
+
+/* virtio_ioctl.c */
+#define DRM_VIRTIO_NUM_IOCTLS 10
+extern struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS];
+
+/* virtio_kms.c */
+int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags);
+int virtio_gpu_driver_unload(struct drm_device *dev);
+
+/* virtio_gem.c */
+void virtio_gpu_gem_free_object(struct drm_gem_object *gem_obj);
+int virtio_gpu_gem_init(struct virtio_gpu_device *vgdev);
+void virtio_gpu_gem_fini(struct virtio_gpu_device *vgdev);
+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 *virtio_gpu_alloc_object(struct drm_device *dev,
+						  size_t size, bool kernel,
+						  bool pinned);
+int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
+				struct drm_device *dev,
+				struct drm_mode_create_dumb *args);
+int virtio_gpu_mode_dumb_destroy(struct drm_file *file_priv,
+				 struct drm_device *dev,
+				 uint32_t handle);
+int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
+			      struct drm_device *dev,
+			      uint32_t handle, uint64_t *offset_p);
+
+/* virtio_fb */
+#define VIRTIO_GPUFB_CONN_LIMIT 1
+int virtio_gpu_fbdev_init(struct virtio_gpu_device *vgdev);
+void virtio_gpu_fbdev_fini(struct virtio_gpu_device *vgdev);
+int virtio_gpu_surface_dirty(struct virtio_gpu_framebuffer *qfb,
+			     struct drm_clip_rect *clips,
+			     unsigned num_clips);
+/* virtio vg */
+int virtio_gpu_alloc_vbufs(struct virtio_gpu_device *vgdev);
+void virtio_gpu_free_vbufs(struct virtio_gpu_device *vgdev);
+void virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
+			       uint32_t *resid);
+void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id);
+void virtio_gpu_cmd_create_resource(struct virtio_gpu_device *vgdev,
+				    uint32_t resource_id,
+				    uint32_t format,
+				    uint32_t width,
+				    uint32_t height);
+void virtio_gpu_cmd_unref_resource(struct virtio_gpu_device *vgdev,
+				   uint32_t resource_id);
+void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev,
+					uint32_t resource_id, uint64_t offset,
+					__le32 width, __le32 height,
+					__le32 x, __le32 y,
+					struct virtio_gpu_fence **fence);
+void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev,
+				   uint32_t resource_id,
+				   uint32_t x, uint32_t y,
+				   uint32_t width, uint32_t height);
+void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev,
+				uint32_t scanout_id, uint32_t resource_id,
+				uint32_t width, uint32_t height,
+				uint32_t x, uint32_t y);
+int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
+			     struct virtio_gpu_object *obj,
+			     uint32_t resource_id,
+			     struct virtio_gpu_fence **fence);
+int virtio_gpu_attach_status_page(struct virtio_gpu_device *vgdev);
+int virtio_gpu_detach_status_page(struct virtio_gpu_device *vgdev);
+void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,
+			    struct virtio_gpu_output *output);
+int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev);
+void virtio_gpu_cmd_resource_inval_backing(struct virtio_gpu_device *vgdev,
+					   uint32_t resource_id);
+void virtio_gpu_ctrl_ack(struct virtqueue *vq);
+void virtio_gpu_cursor_ack(struct virtqueue *vq);
+void virtio_gpu_dequeue_ctrl_func(struct work_struct *work);
+void virtio_gpu_dequeue_cursor_func(struct work_struct *work);
+
+/* virtio_gpu_display.c */
+int virtio_gpu_framebuffer_init(struct drm_device *dev,
+				struct virtio_gpu_framebuffer *vgfb,
+				struct drm_mode_fb_cmd2 *mode_cmd,
+				struct drm_gem_object *obj);
+int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev);
+void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev);
+
+/* virtio_gpu_plane.c */
+struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev,
+					int index);
+
+/* virtio_gpu_ttm.c */
+int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev);
+void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev);
+int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma);
+
+/* virtio_gpu_fence.c */
+int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
+			  struct virtio_gpu_ctrl_hdr *cmd_hdr,
+			  struct virtio_gpu_fence **fence);
+void virtio_gpu_fence_event_process(struct virtio_gpu_device *vdev,
+				    u64 last_seq);
+
+/* virtio_gpu_object */
+int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
+			     unsigned long size, bool kernel, bool pinned,
+			     struct virtio_gpu_object **bo_ptr);
+int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr);
+int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
+				   struct virtio_gpu_object *bo);
+void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo);
+int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait);
+
+static inline struct virtio_gpu_object*
+virtio_gpu_object_ref(struct virtio_gpu_object *bo)
+{
+	ttm_bo_reference(&bo->tbo);
+	return bo;
+}
+
+static inline void virtio_gpu_object_unref(struct virtio_gpu_object **bo)
+{
+	struct ttm_buffer_object *tbo;
+
+	if ((*bo) == NULL)
+		return;
+	tbo = &((*bo)->tbo);
+	ttm_bo_unref(&tbo);
+	if (tbo == NULL)
+		*bo = NULL;
+}
+
+static inline u64 virtio_gpu_object_mmap_offset(struct virtio_gpu_object *bo)
+{
+	return drm_vma_node_offset_addr(&bo->tbo.vma_node);
+}
+
+static inline int virtio_gpu_object_reserve(struct virtio_gpu_object *bo,
+					 bool no_wait)
+{
+	int r;
+
+	r = ttm_bo_reserve(&bo->tbo, true, no_wait, false, NULL);
+	if (unlikely(r != 0)) {
+		if (r != -ERESTARTSYS) {
+			struct virtio_gpu_device *qdev =
+				bo->gem_base.dev->dev_private;
+			dev_err(qdev->dev, "%p reserve failed\n", bo);
+		}
+		return r;
+	}
+	return 0;
+}
+
+static inline void virtio_gpu_object_unreserve(struct virtio_gpu_object *bo)
+{
+	ttm_bo_unreserve(&bo->tbo);
+}
+
+/* virgl debufs */
+int virtio_gpu_debugfs_init(struct drm_minor *minor);
+void virtio_gpu_debugfs_takedown(struct drm_minor *minor);
+
+#endif

drivers/gpu/drm/virtio/virtgpu_fb.c

+/*
+ * 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 <drm/drm_fb_helper.h>
+#include "virtgpu_drv.h"
+
+#define VIRTIO_GPU_FBCON_POLL_PERIOD (HZ / 60)
+
+struct virtio_gpu_fbdev {
+	struct drm_fb_helper           helper;
+	struct virtio_gpu_framebuffer  vgfb;
+	struct list_head	       fbdev_list;
+	struct virtio_gpu_device       *vgdev;
+	struct delayed_work            work;
+};
+
+static int virtio_gpu_dirty_update(struct virtio_gpu_framebuffer *fb,
+				   bool store, int x, int y,
+				   int width, int height)
+{
+	struct drm_device *dev = fb->base.dev;
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	bool store_for_later = false;
+	int bpp = fb->base.bits_per_pixel / 8;
+	int x2, y2;
+	unsigned long flags;
+	struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(fb->obj);
+
+	if ((width <= 0) ||
+	    (x + width > fb->base.width) ||
+	    (y + height > fb->base.height)) {
+		DRM_DEBUG("values out of range %dx%d+%d+%d, fb %dx%d\n",
+			  width, height, x, y,
+			  fb->base.width, fb->base.height);
+		return -EINVAL;
+	}
+
+	/*
+	 * Can be called with pretty much any context (console output
+	 * path).  If we are in atomic just store the dirty rect info
+	 * to send out the update later.
+	 *
+	 * Can't test inside spin lock.
+	 */
+	if (in_atomic() || store)
+		store_for_later = true;
+
+	x2 = x + width - 1;
+	y2 = y + height - 1;
+
+	spin_lock_irqsave(&fb->dirty_lock, flags);
+
+	if (fb->y1 < y)
+		y = fb->y1;
+	if (fb->y2 > y2)
+		y2 = fb->y2;
+	if (fb->x1 < x)
+		x = fb->x1;
+	if (fb->x2 > x2)
+		x2 = fb->x2;
+
+	if (store_for_later) {
+		fb->x1 = x;
+		fb->x2 = x2;
+		fb->y1 = y;
+		fb->y2 = y2;
+		spin_unlock_irqrestore(&fb->dirty_lock, flags);
+		return 0;
+	}
+
+	fb->x1 = fb->y1 = INT_MAX;
+	fb->x2 = fb->y2 = 0;
+
+	spin_unlock_irqrestore(&fb->dirty_lock, flags);
+
+	{
+		uint32_t offset;
+		uint32_t w = x2 - x + 1;
+		uint32_t h = y2 - y + 1;
+
+		offset = (y * fb->base.pitches[0]) + x * bpp;
+
+		virtio_gpu_cmd_transfer_to_host_2d(vgdev, obj->hw_res_handle,
+						   offset,
+						   cpu_to_le32(w),
+						   cpu_to_le32(h),
+						   cpu_to_le32(x),
+						   cpu_to_le32(y),
+						   NULL);
+
+	}
+	virtio_gpu_cmd_resource_flush(vgdev, obj->hw_res_handle,
+				      x, y, x2 - x + 1, y2 - y + 1);
+	return 0;
+}
+
+int virtio_gpu_surface_dirty(struct virtio_gpu_framebuffer *vgfb,
+			     struct drm_clip_rect *clips,
+			     unsigned num_clips)
+{
+	struct virtio_gpu_device *vgdev = vgfb->base.dev->dev_private;
+	struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(vgfb->obj);
+	struct drm_clip_rect norect;
+	struct drm_clip_rect *clips_ptr;
+	int left, right, top, bottom;
+	int i;
+	int inc = 1;
+	if (!num_clips) {
+		num_clips = 1;
+		clips = &norect;
+		norect.x1 = norect.y1 = 0;
+		norect.x2 = vgfb->base.width;
+		norect.y2 = vgfb->base.height;
+	}
+	left = clips->x1;
+	right = clips->x2;
+	top = clips->y1;
+	bottom = clips->y2;
+
+	/* skip the first clip rect */
+	for (i = 1, clips_ptr = clips + inc;
+	     i < num_clips; i++, clips_ptr += inc) {
+		left = min_t(int, left, (int)clips_ptr->x1);
+		right = max_t(int, right, (int)clips_ptr->x2);
+		top = min_t(int, top, (int)clips_ptr->y1);
+		bottom = max_t(int, bottom, (int)clips_ptr->y2);
+	}
+
+	if (obj->dumb)
+		return virtio_gpu_dirty_update(vgfb, false, left, top,
+					       right - left, bottom - top);
+
+	virtio_gpu_cmd_resource_flush(vgdev, obj->hw_res_handle,
+				      left, top, right - left, bottom - top);
+	return 0;
+}
+
+static void virtio_gpu_fb_dirty_work(struct work_struct *work)
+{
+	struct delayed_work *delayed_work = to_delayed_work(work);
+	struct virtio_gpu_fbdev *vfbdev =
+		container_of(delayed_work, struct virtio_gpu_fbdev, work);
+	struct virtio_gpu_framebuffer *vgfb = &vfbdev->vgfb;
+
+	virtio_gpu_dirty_update(&vfbdev->vgfb, false, vgfb->x1, vgfb->y1,
+				vgfb->x2 - vgfb->x1, vgfb->y2 - vgfb->y1);
+}
+
+static void virtio_gpu_3d_fillrect(struct fb_info *info,
+				   const struct fb_fillrect *rect)
+{
+	struct virtio_gpu_fbdev *vfbdev = info->par;
+	sys_fillrect(info, rect);
+	virtio_gpu_dirty_update(&vfbdev->vgfb, true, rect->dx, rect->dy,
+			     rect->width, rect->height);
+	schedule_delayed_work(&vfbdev->work, VIRTIO_GPU_FBCON_POLL_PERIOD);
+}
+
+static void virtio_gpu_3d_copyarea(struct fb_info *info,
+				   const struct fb_copyarea *area)
+{
+	struct virtio_gpu_fbdev *vfbdev = info->par;
+	sys_copyarea(info, area);
+	virtio_gpu_dirty_update(&vfbdev->vgfb, true, area->dx, area->dy,
+			   area->width, area->height);
+	schedule_delayed_work(&vfbdev->work, VIRTIO_GPU_FBCON_POLL_PERIOD);
+}
+
+static void virtio_gpu_3d_imageblit(struct fb_info *info,
+				    const struct fb_image *image)
+{
+	struct virtio_gpu_fbdev *vfbdev = info->par;
+	sys_imageblit(info, image);
+	virtio_gpu_dirty_update(&vfbdev->vgfb, true, image->dx, image->dy,
+			     image->width, image->height);
+	schedule_delayed_work(&vfbdev->work, VIRTIO_GPU_FBCON_POLL_PERIOD);
+}
+
+static struct fb_ops virtio_gpufb_ops = {
+	.owner = THIS_MODULE,
+	.fb_check_var = drm_fb_helper_check_var,
+	.fb_set_par = drm_fb_helper_set_par, /* TODO: copy vmwgfx */
+	.fb_fillrect = virtio_gpu_3d_fillrect,
+	.fb_copyarea = virtio_gpu_3d_copyarea,
+	.fb_imageblit = virtio_gpu_3d_imageblit,
+	.fb_pan_display = drm_fb_helper_pan_display,
+	.fb_blank = drm_fb_helper_blank,
+	.fb_setcmap = drm_fb_helper_setcmap,
+	.fb_debug_enter = drm_fb_helper_debug_enter,
+	.fb_debug_leave = drm_fb_helper_debug_leave,
+};
+
+static int virtio_gpu_vmap_fb(struct virtio_gpu_device *vgdev,
+			      struct virtio_gpu_object *obj)
+{
+	return virtio_gpu_object_kmap(obj, NULL);
+}
+
+static int virtio_gpufb_create(struct drm_fb_helper *helper,
+			       struct drm_fb_helper_surface_size *sizes)
+{
+	struct virtio_gpu_fbdev *vfbdev =
+		container_of(helper, struct virtio_gpu_fbdev, helper);
+	struct drm_device *dev = helper->dev;
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct fb_info *info;
+	struct drm_framebuffer *fb;
+	struct drm_mode_fb_cmd2 mode_cmd = {};
+	struct virtio_gpu_object *obj;
+	struct device *device = vgdev->dev;
+	uint32_t resid, format, size;
+	int ret;
+
+	mode_cmd.width = sizes->surface_width;
+	mode_cmd.height = sizes->surface_height;
+	mode_cmd.pitches[0] = mode_cmd.width * 4;
+	mode_cmd.pixel_format = drm_mode_legacy_fb_format(32, 24);
+
+	switch (mode_cmd.pixel_format) {
+#ifdef __BIG_ENDIAN
+	case DRM_FORMAT_XRGB8888:
+		format = VIRTIO_GPU_FORMAT_X8R8G8B8_UNORM;
+		break;
+	case DRM_FORMAT_ARGB8888:
+		format = VIRTIO_GPU_FORMAT_A8R8G8B8_UNORM;
+		break;
+	case DRM_FORMAT_BGRX8888:
+		format = VIRTIO_GPU_FORMAT_B8G8R8X8_UNORM;
+		break;
+	case DRM_FORMAT_BGRA8888:
+		format = VIRTIO_GPU_FORMAT_B8G8R8A8_UNORM;
+		break;
+	case DRM_FORMAT_RGBX8888:
+		format = VIRTIO_GPU_FORMAT_R8G8B8X8_UNORM;
+		break;
+	case DRM_FORMAT_RGBA8888:
+		format = VIRTIO_GPU_FORMAT_R8G8B8A8_UNORM;
+		break;
+	case DRM_FORMAT_XBGR8888:
+		format = VIRTIO_GPU_FORMAT_X8B8G8R8_UNORM;
+		break;
+	case DRM_FORMAT_ABGR8888:
+		format = VIRTIO_GPU_FORMAT_A8B8G8R8_UNORM;
+		break;
+#else
+	case DRM_FORMAT_XRGB8888:
+		format = VIRTIO_GPU_FORMAT_B8G8R8X8_UNORM;
+		break;
+	case DRM_FORMAT_ARGB8888:
+		format = VIRTIO_GPU_FORMAT_B8G8R8A8_UNORM;
+		break;
+	case DRM_FORMAT_BGRX8888:
+		format = VIRTIO_GPU_FORMAT_X8R8G8B8_UNORM;
+		break;
+	case DRM_FORMAT_BGRA8888:
+		format = VIRTIO_GPU_FORMAT_A8R8G8B8_UNORM;
+		break;
+	case DRM_FORMAT_RGBX8888:
+		format = VIRTIO_GPU_FORMAT_X8B8G8R8_UNORM;
+		break;
+	case DRM_FORMAT_RGBA8888:
+		format = VIRTIO_GPU_FORMAT_A8B8G8R8_UNORM;
+		break;
+	case DRM_FORMAT_XBGR8888:
+		format = VIRTIO_GPU_FORMAT_R8G8B8X8_UNORM;
+		break;
+	case DRM_FORMAT_ABGR8888:
+		format = VIRTIO_GPU_FORMAT_R8G8B8A8_UNORM;
+		break;
+#endif
+	default:
+		DRM_ERROR("failed to find virtio gpu format for %d\n",
+			  mode_cmd.pixel_format);
+		return -EINVAL;
+	}
+
+	size = mode_cmd.pitches[0] * mode_cmd.height;
+	obj = virtio_gpu_alloc_object(dev, size, false, true);
+	if (!obj)
+		return -ENOMEM;
+
+	virtio_gpu_resource_id_get(vgdev, &resid);
+	virtio_gpu_cmd_create_resource(vgdev, resid, format,
+				       mode_cmd.width, mode_cmd.height);
+
+	ret = virtio_gpu_vmap_fb(vgdev, obj);
+	if (ret) {
+		DRM_ERROR("failed to vmap fb %d\n", ret);
+		goto err_obj_vmap;
+	}
+
+	/* attach the object to the resource */
+	ret = virtio_gpu_object_attach(vgdev, obj, resid, NULL);
+	if (ret)
+		goto err_obj_attach;
+
+	info = framebuffer_alloc(0, device);
+	if (!info) {
+		ret = -ENOMEM;
+		goto err_fb_alloc;
+	}
+
+	ret = fb_alloc_cmap(&info->cmap, 256, 0);
+	if (ret) {
+		ret = -ENOMEM;
+		goto err_fb_alloc_cmap;
+	}
+
+	info->par = helper;
+
+	ret = virtio_gpu_framebuffer_init(dev, &vfbdev->vgfb,
+					  &mode_cmd, &obj->gem_base);
+	if (ret)
+		goto err_fb_init;
+
+	fb = &vfbdev->vgfb.base;
+
+	vfbdev->helper.fb = fb;
+	vfbdev->helper.fbdev = info;
+
+	strcpy(info->fix.id, "virtiodrmfb");
+	info->flags = FBINFO_DEFAULT;
+	info->fbops = &virtio_gpufb_ops;
+	info->pixmap.flags = FB_PIXMAP_SYSTEM;
+
+	info->screen_base = obj->vmap;
+	info->screen_size = obj->gem_base.size;
+	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
+	drm_fb_helper_fill_var(info, &vfbdev->helper,
+			       sizes->fb_width, sizes->fb_height);
+
+	info->fix.mmio_start = 0;
+	info->fix.mmio_len = 0;
+	return 0;
+
+err_fb_init:
+	fb_dealloc_cmap(&info->cmap);
+err_fb_alloc_cmap:
+	framebuffer_release(info);
+err_fb_alloc:
+	virtio_gpu_cmd_resource_inval_backing(vgdev, resid);
+err_obj_attach:
+err_obj_vmap:
+	virtio_gpu_gem_free_object(&obj->gem_base);
+	return ret;
+}
+
+static int virtio_gpu_fbdev_destroy(struct drm_device *dev,
+				    struct virtio_gpu_fbdev *vgfbdev)
+{
+	struct fb_info *info;
+	struct virtio_gpu_framebuffer *vgfb = &vgfbdev->vgfb;
+
+	if (vgfbdev->helper.fbdev) {
+		info = vgfbdev->helper.fbdev;
+
+		unregister_framebuffer(info);
+		framebuffer_release(info);
+	}
+	if (vgfb->obj)
+		vgfb->obj = NULL;
+	drm_fb_helper_fini(&vgfbdev->helper);
+	drm_framebuffer_cleanup(&vgfb->base);
+
+	return 0;
+}
+static struct drm_fb_helper_funcs virtio_gpu_fb_helper_funcs = {
+	.fb_probe = virtio_gpufb_create,
+};
+
+int virtio_gpu_fbdev_init(struct virtio_gpu_device *vgdev)
+{
+	struct virtio_gpu_fbdev *vgfbdev;
+	int bpp_sel = 32; /* TODO: parameter from somewhere? */
+	int ret;
+
+	vgfbdev = kzalloc(sizeof(struct virtio_gpu_fbdev), GFP_KERNEL);
+	if (!vgfbdev)
+		return -ENOMEM;
+
+	vgfbdev->vgdev = vgdev;
+	vgdev->vgfbdev = vgfbdev;
+	INIT_DELAYED_WORK(&vgfbdev->work, virtio_gpu_fb_dirty_work);
+
+	drm_fb_helper_prepare(vgdev->ddev, &vgfbdev->helper,
+			      &virtio_gpu_fb_helper_funcs);
+	ret = drm_fb_helper_init(vgdev->ddev, &vgfbdev->helper,
+				 vgdev->num_scanouts,
+				 VIRTIO_GPUFB_CONN_LIMIT);
+	if (ret) {
+		kfree(vgfbdev);
+		return ret;
+	}
+
+	drm_fb_helper_single_add_all_connectors(&vgfbdev->helper);
+	drm_fb_helper_initial_config(&vgfbdev->helper, bpp_sel);
+	return 0;
+}
+
+void virtio_gpu_fbdev_fini(struct virtio_gpu_device *vgdev)
+{
+	if (!vgdev->vgfbdev)
+		return;
+
+	virtio_gpu_fbdev_destroy(vgdev->ddev, vgdev->vgfbdev);
+	kfree(vgdev->vgfbdev);
+	vgdev->vgfbdev = NULL;
+}

drivers/gpu/drm/virtio/virtgpu_fence.c

+/*
+ * 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"
+
+static const char *virtio_get_driver_name(struct fence *f)
+{
+	return "virtio_gpu";
+}
+
+static const char *virtio_get_timeline_name(struct fence *f)
+{
+	return "controlq";
+}
+
+static bool virtio_enable_signaling(struct fence *f)
+{
+	return true;
+}
+
+static bool virtio_signaled(struct fence *f)
+{
+	struct virtio_gpu_fence *fence = to_virtio_fence(f);
+
+	if (atomic64_read(&fence->drv->last_seq) >= fence->seq)
+		return true;
+	return false;
+}
+
+static void virtio_fence_value_str(struct fence *f, char *str, int size)
+{
+	struct virtio_gpu_fence *fence = to_virtio_fence(f);
+
+	snprintf(str, size, "%llu", fence->seq);
+}
+
+static void virtio_timeline_value_str(struct fence *f, char *str, int size)
+{
+	struct virtio_gpu_fence *fence = to_virtio_fence(f);
+
+	snprintf(str, size, "%lu", atomic64_read(&fence->drv->last_seq));
+}
+
+static const struct fence_ops virtio_fence_ops = {
+	.get_driver_name     = virtio_get_driver_name,
+	.get_timeline_name   = virtio_get_timeline_name,
+	.enable_signaling    = virtio_enable_signaling,
+	.signaled            = virtio_signaled,
+	.wait                = fence_default_wait,
+	.fence_value_str     = virtio_fence_value_str,
+	.timeline_value_str  = virtio_timeline_value_str,
+};
+
+int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
+			  struct virtio_gpu_ctrl_hdr *cmd_hdr,
+			  struct virtio_gpu_fence **fence)
+{
+	struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
+	unsigned long irq_flags;
+
+	*fence = kmalloc(sizeof(struct virtio_gpu_fence), GFP_KERNEL);
+	if ((*fence) == NULL)
+		return -ENOMEM;
+
+	spin_lock_irqsave(&drv->lock, irq_flags);
+	(*fence)->drv = drv;
+	(*fence)->seq = ++drv->sync_seq;
+	fence_init(&(*fence)->f, &virtio_fence_ops, &drv->lock,
+		   0, (*fence)->seq);
+	fence_get(&(*fence)->f);
+	list_add_tail(&(*fence)->node, &drv->fences);
+	spin_unlock_irqrestore(&drv->lock, irq_flags);
+
+	cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
+	cmd_hdr->fence_id = cpu_to_le64((*fence)->seq);
+	return 0;
+}
+
+void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
+				    u64 last_seq)
+{
+	struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
+	struct virtio_gpu_fence *fence, *tmp;
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(&drv->lock, irq_flags);
+	atomic64_set(&vgdev->fence_drv.last_seq, last_seq);
+	list_for_each_entry_safe(fence, tmp, &drv->fences, node) {
+		if (last_seq < fence->seq)
+			continue;
+		fence_signal_locked(&fence->f);
+		list_del(&fence->node);
+		fence_put(&fence->f);
+	}
+	spin_unlock_irqrestore(&drv->lock, irq_flags);
+}

drivers/gpu/drm/virtio/virtgpu_gem.c

+/*
+ * 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;
+}

drivers/gpu/drm/virtio/virtgpu_kms.c

+/*
+ * 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/virtio.h>
+#include <linux/virtio_config.h>
+#include <drm/drmP.h>
+#include "virtgpu_drv.h"
+
+static int virtio_gpu_fbdev = 1;
+
+MODULE_PARM_DESC(fbdev, "Disable/Enable framebuffer device & console");
+module_param_named(fbdev, virtio_gpu_fbdev, int, 0400);
+
+static void virtio_gpu_config_changed_work_func(struct work_struct *work)
+{
+	struct virtio_gpu_device *vgdev =
+		container_of(work, struct virtio_gpu_device,
+			     config_changed_work);
+	u32 events_read, events_clear = 0;
+
+	/* read the config space */
+	virtio_cread(vgdev->vdev, struct virtio_gpu_config,
+		     events_read, &events_read);
+	if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
+		virtio_gpu_cmd_get_display_info(vgdev);
+		drm_helper_hpd_irq_event(vgdev->ddev);
+		events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
+	}
+	virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
+		      events_clear, &events_clear);
+}
+
+static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
+			       void (*work_func)(struct work_struct *work))
+{
+	spin_lock_init(&vgvq->qlock);
+	init_waitqueue_head(&vgvq->ack_queue);
+	INIT_WORK(&vgvq->dequeue_work, work_func);
+}
+
+int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
+{
+	static vq_callback_t *callbacks[] = {
+		virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
+	};
+	static const char *names[] = { "control", "cursor" };
+
+	struct virtio_gpu_device *vgdev;
+	/* this will expand later */
+	struct virtqueue *vqs[2];
+	u32 num_scanouts;
+	int ret;
+
+	if (!virtio_has_feature(dev->virtdev, VIRTIO_F_VERSION_1))
+		return -ENODEV;
+
+	vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
+	if (!vgdev)
+		return -ENOMEM;
+
+	vgdev->ddev = dev;
+	dev->dev_private = vgdev;
+	vgdev->vdev = dev->virtdev;
+	vgdev->dev = dev->dev;
+
+	spin_lock_init(&vgdev->display_info_lock);
+	spin_lock_init(&vgdev->ctx_id_idr_lock);
+	idr_init(&vgdev->ctx_id_idr);
+	spin_lock_init(&vgdev->resource_idr_lock);
+	idr_init(&vgdev->resource_idr);
+	init_waitqueue_head(&vgdev->resp_wq);
+	virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
+	virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
+
+	spin_lock_init(&vgdev->fence_drv.lock);
+	INIT_LIST_HEAD(&vgdev->fence_drv.fences);
+	INIT_WORK(&vgdev->config_changed_work,
+		  virtio_gpu_config_changed_work_func);
+
+	ret = vgdev->vdev->config->find_vqs(vgdev->vdev, 2, vqs,
+					    callbacks, names);
+	if (ret) {
+		DRM_ERROR("failed to find virt queues\n");
+		goto err_vqs;
+	}
+	vgdev->ctrlq.vq = vqs[0];
+	vgdev->cursorq.vq = vqs[1];
+	ret = virtio_gpu_alloc_vbufs(vgdev);
+	if (ret) {
+		DRM_ERROR("failed to alloc vbufs\n");
+		goto err_vbufs;
+	}
+
+	ret = virtio_gpu_ttm_init(vgdev);
+	if (ret) {
+		DRM_ERROR("failed to init ttm %d\n", ret);
+		goto err_ttm;
+	}
+
+	/* get display info */
+	virtio_cread(vgdev->vdev, struct virtio_gpu_config,
+		     num_scanouts, &num_scanouts);
+	vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
+				    VIRTIO_GPU_MAX_SCANOUTS);
+	if (!vgdev->num_scanouts) {
+		DRM_ERROR("num_scanouts is zero\n");
+		ret = -EINVAL;
+		goto err_scanouts;
+	}
+
+	ret = virtio_gpu_modeset_init(vgdev);
+	if (ret)
+		goto err_modeset;
+
+	virtio_device_ready(vgdev->vdev);
+	vgdev->vqs_ready = true;
+
+	if (virtio_gpu_fbdev)
+		virtio_gpu_fbdev_init(vgdev);
+	virtio_gpu_cmd_get_display_info(vgdev);
+
+	return 0;
+
+err_modeset:
+err_scanouts:
+	virtio_gpu_ttm_fini(vgdev);
+err_ttm:
+	virtio_gpu_free_vbufs(vgdev);
+err_vbufs:
+	vgdev->vdev->config->del_vqs(vgdev->vdev);
+err_vqs:
+	kfree(vgdev);
+	return ret;
+}
+
+int virtio_gpu_driver_unload(struct drm_device *dev)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+
+	vgdev->vqs_ready = false;
+	flush_work(&vgdev->ctrlq.dequeue_work);
+	flush_work(&vgdev->cursorq.dequeue_work);
+	flush_work(&vgdev->config_changed_work);
+	vgdev->vdev->config->del_vqs(vgdev->vdev);
+
+	virtio_gpu_modeset_fini(vgdev);
+	virtio_gpu_ttm_fini(vgdev);
+	virtio_gpu_free_vbufs(vgdev);
+	kfree(vgdev);
+	return 0;
+}

drivers/gpu/drm/virtio/virtgpu_object.c

+/*
+ * 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 "virtgpu_drv.h"
+
+static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
+{
+	struct virtio_gpu_object *bo;
+	struct virtio_gpu_device *vgdev;
+
+	bo = container_of(tbo, struct virtio_gpu_object, tbo);
+	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
+
+	if (bo->hw_res_handle)
+		virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
+	if (bo->pages)
+		virtio_gpu_object_free_sg_table(bo);
+	drm_gem_object_release(&bo->gem_base);
+	kfree(bo);
+}
+
+static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
+					  bool pinned)
+{
+	u32 c = 1;
+	u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
+
+	vgbo->placement.placement = &vgbo->placement_code;
+	vgbo->placement.busy_placement = &vgbo->placement_code;
+	vgbo->placement_code.fpfn = 0;
+	vgbo->placement_code.lpfn = 0;
+	vgbo->placement_code.flags =
+		TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
+	vgbo->placement.num_placement = c;
+	vgbo->placement.num_busy_placement = c;
+
+}
+
+int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
+			     unsigned long size, bool kernel, bool pinned,
+			     struct virtio_gpu_object **bo_ptr)
+{
+	struct virtio_gpu_object *bo;
+	enum ttm_bo_type type;
+	size_t acc_size;
+	int ret;
+
+	if (kernel)
+		type = ttm_bo_type_kernel;
+	else
+		type = ttm_bo_type_device;
+	*bo_ptr = NULL;
+
+	acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
+				       sizeof(struct virtio_gpu_object));
+
+	bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
+	if (bo == NULL)
+		return -ENOMEM;
+	size = roundup(size, PAGE_SIZE);
+	ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
+	if (ret != 0)
+		goto err_gem_init;
+	bo->dumb = false;
+	virtio_gpu_init_ttm_placement(bo, pinned);
+
+	ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
+			  &bo->placement, 0, !kernel, NULL, acc_size,
+			  NULL, NULL, &virtio_gpu_ttm_bo_destroy);
+	if (ret != 0)
+		goto err_ttm_init;
+
+	*bo_ptr = bo;
+	return 0;
+
+err_ttm_init:
+	drm_gem_object_release(&bo->gem_base);
+err_gem_init:
+	kfree(bo);
+	return ret;
+}
+
+int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr)
+{
+	bool is_iomem;
+	int r;
+
+	if (bo->vmap) {
+		if (ptr)
+			*ptr = bo->vmap;
+		return 0;
+	}
+	r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
+	if (r)
+		return r;
+	bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
+	if (ptr)
+		*ptr = bo->vmap;
+	return 0;
+}
+
+int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
+				   struct virtio_gpu_object *bo)
+{
+	int ret;
+	struct page **pages = bo->tbo.ttm->pages;
+	int nr_pages = bo->tbo.num_pages;
+
+	/* wtf swapping */
+	if (bo->pages)
+		return 0;
+
+	if (bo->tbo.ttm->state == tt_unpopulated)
+		bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm);
+	bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
+	if (!bo->pages)
+		goto out;
+
+	ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
+					nr_pages << PAGE_SHIFT, GFP_KERNEL);
+	if (ret)
+		goto out;
+	return 0;
+out:
+	kfree(bo->pages);
+	bo->pages = NULL;
+	return -ENOMEM;
+}
+
+void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
+{
+	sg_free_table(bo->pages);
+	kfree(bo->pages);
+	bo->pages = NULL;
+}
+
+int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
+{
+	int r;
+
+	r = ttm_bo_reserve(&bo->tbo, true, no_wait, false, NULL);
+	if (unlikely(r != 0))
+		return r;
+	r = ttm_bo_wait(&bo->tbo, true, true, no_wait);
+	ttm_bo_unreserve(&bo->tbo);
+	return r;
+}
+

drivers/gpu/drm/virtio/virtgpu_plane.c

+/*
+ * 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 "virtgpu_drv.h"
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_atomic_helper.h>
+
+static const uint32_t virtio_gpu_formats[] = {
+	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_ARGB8888,
+	DRM_FORMAT_BGRX8888,
+	DRM_FORMAT_BGRA8888,
+	DRM_FORMAT_RGBX8888,
+	DRM_FORMAT_RGBA8888,
+	DRM_FORMAT_XBGR8888,
+	DRM_FORMAT_ABGR8888,
+};
+
+static void virtio_gpu_plane_destroy(struct drm_plane *plane)
+{
+	kfree(plane);
+}
+
+static const struct drm_plane_funcs virtio_gpu_plane_funcs = {
+	.update_plane		= drm_atomic_helper_update_plane,
+	.disable_plane		= drm_atomic_helper_disable_plane,
+	.destroy		= virtio_gpu_plane_destroy,
+	.reset			= drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+};
+
+static int virtio_gpu_plane_atomic_check(struct drm_plane *plane,
+					 struct drm_plane_state *state)
+{
+	return 0;
+}
+
+static void virtio_gpu_plane_atomic_update(struct drm_plane *plane,
+					   struct drm_plane_state *old_state)
+{
+	struct drm_device *dev = plane->dev;
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(plane->crtc);
+	struct virtio_gpu_framebuffer *vgfb;
+	struct virtio_gpu_object *bo;
+	uint32_t handle;
+
+	if (plane->fb) {
+		vgfb = to_virtio_gpu_framebuffer(plane->fb);
+		bo = gem_to_virtio_gpu_obj(vgfb->obj);
+		handle = bo->hw_res_handle;
+	} else {
+		handle = 0;
+	}
+
+	DRM_DEBUG("handle 0x%x, crtc %dx%d+%d+%d\n", handle,
+		  plane->state->crtc_w, plane->state->crtc_h,
+		  plane->state->crtc_x, plane->state->crtc_y);
+	virtio_gpu_cmd_set_scanout(vgdev, output->index, handle,
+				   plane->state->crtc_w,
+				   plane->state->crtc_h,
+				   plane->state->crtc_x,
+				   plane->state->crtc_y);
+}
+
+
+static const struct drm_plane_helper_funcs virtio_gpu_plane_helper_funcs = {
+	.atomic_check		= virtio_gpu_plane_atomic_check,
+	.atomic_update		= virtio_gpu_plane_atomic_update,
+};
+
+struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev,
+					int index)
+{
+	struct drm_device *dev = vgdev->ddev;
+	struct drm_plane *plane;
+	int ret;
+
+	plane = kzalloc(sizeof(*plane), GFP_KERNEL);
+	if (!plane)
+		return ERR_PTR(-ENOMEM);
+
+	ret = drm_universal_plane_init(dev, plane, 1 << index,
+				       &virtio_gpu_plane_funcs,
+				       virtio_gpu_formats,
+				       ARRAY_SIZE(virtio_gpu_formats),
+				       DRM_PLANE_TYPE_PRIMARY);
+	if (ret)
+		goto err_plane_init;
+
+	drm_plane_helper_add(plane, &virtio_gpu_plane_helper_funcs);
+	return plane;
+
+err_plane_init:
+	kfree(plane);
+	return ERR_PTR(ret);
+}

drivers/gpu/drm/virtio/virtgpu_ttm.c

+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * Authors:
+ *    Dave Airlie
+ *    Alon Levy
+ *
+ * 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 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 HOLDER(S) OR AUTHOR(S) 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 <ttm/ttm_bo_api.h>
+#include <ttm/ttm_bo_driver.h>
+#include <ttm/ttm_placement.h>
+#include <ttm/ttm_page_alloc.h>
+#include <ttm/ttm_module.h>
+#include <drm/drmP.h>
+#include <drm/drm.h>
+#include "virtgpu_drv.h"
+
+#include <linux/delay.h>
+
+#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
+
+static struct
+virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
+{
+	struct virtio_gpu_mman *mman;
+	struct virtio_gpu_device *vgdev;
+
+	mman = container_of(bdev, struct virtio_gpu_mman, bdev);
+	vgdev = container_of(mman, struct virtio_gpu_device, mman);
+	return vgdev;
+}
+
+static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref)
+{
+	return ttm_mem_global_init(ref->object);
+}
+
+static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref)
+{
+	ttm_mem_global_release(ref->object);
+}
+
+static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	vgdev->mman.mem_global_referenced = false;
+	global_ref = &vgdev->mman.mem_global_ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
+	global_ref->size = sizeof(struct ttm_mem_global);
+	global_ref->init = &virtio_gpu_ttm_mem_global_init;
+	global_ref->release = &virtio_gpu_ttm_mem_global_release;
+
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM memory accounting "
+			  "subsystem.\n");
+		return r;
+	}
+
+	vgdev->mman.bo_global_ref.mem_glob =
+		vgdev->mman.mem_global_ref.object;
+	global_ref = &vgdev->mman.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_init;
+	global_ref->release = &ttm_bo_global_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		drm_global_item_unref(&vgdev->mman.mem_global_ref);
+		return r;
+	}
+
+	vgdev->mman.mem_global_referenced = true;
+	return 0;
+}
+
+static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
+{
+	if (vgdev->mman.mem_global_referenced) {
+		drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
+		drm_global_item_unref(&vgdev->mman.mem_global_ref);
+		vgdev->mman.mem_global_referenced = false;
+	}
+}
+
+#if 0
+/*
+ * Hmm, seems to not do anything useful.  Leftover debug hack?
+ * Something like printing pagefaults to kernel log?
+ */
+static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
+static const struct vm_operations_struct *ttm_vm_ops;
+
+static int virtio_gpu_ttm_fault(struct vm_area_struct *vma,
+				struct vm_fault *vmf)
+{
+	struct ttm_buffer_object *bo;
+	struct virtio_gpu_device *vgdev;
+	int r;
+
+	bo = (struct ttm_buffer_object *)vma->vm_private_data;
+	if (bo == NULL)
+		return VM_FAULT_NOPAGE;
+	vgdev = virtio_gpu_get_vgdev(bo->bdev);
+	r = ttm_vm_ops->fault(vma, vmf);
+	return r;
+}
+#endif
+
+int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct drm_file *file_priv;
+	struct virtio_gpu_device *vgdev;
+	int r;
+
+	file_priv = filp->private_data;
+	vgdev = file_priv->minor->dev->dev_private;
+	if (vgdev == NULL) {
+		DRM_ERROR(
+		 "filp->private_data->minor->dev->dev_private == NULL\n");
+		return -EINVAL;
+	}
+	r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
+#if 0
+	if (unlikely(r != 0))
+		return r;
+	if (unlikely(ttm_vm_ops == NULL)) {
+		ttm_vm_ops = vma->vm_ops;
+		virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
+		virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
+	}
+	vma->vm_ops = &virtio_gpu_ttm_vm_ops;
+	return 0;
+#else
+	return r;
+#endif
+}
+
+static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
+					uint32_t flags)
+{
+	return 0;
+}
+
+static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
+			       struct ttm_buffer_object *bo,
+			       const struct ttm_place *place,
+			       struct ttm_mem_reg *mem)
+{
+	mem->mm_node = (void *)1;
+	return 0;
+}
+
+static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
+				struct ttm_mem_reg *mem)
+{
+	mem->mm_node = (void *)NULL;
+	return;
+}
+
+static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
+			   unsigned long p_size)
+{
+	return 0;
+}
+
+static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
+{
+	return 0;
+}
+
+static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
+			     const char *prefix)
+{
+}
+
+static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
+	ttm_bo_man_init,
+	ttm_bo_man_takedown,
+	ttm_bo_man_get_node,
+	ttm_bo_man_put_node,
+	ttm_bo_man_debug
+};
+
+static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
+				    struct ttm_mem_type_manager *man)
+{
+	struct virtio_gpu_device *vgdev;
+
+	vgdev = virtio_gpu_get_vgdev(bdev);
+
+	switch (type) {
+	case TTM_PL_SYSTEM:
+		/* System memory */
+		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_MASK_CACHING;
+		man->default_caching = TTM_PL_FLAG_CACHED;
+		break;
+	case TTM_PL_TT:
+		man->func = &virtio_gpu_bo_manager_func;
+		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_MASK_CACHING;
+		man->default_caching = TTM_PL_FLAG_CACHED;
+		break;
+	default:
+		DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
+				struct ttm_placement *placement)
+{
+	static struct ttm_place placements = {
+		.fpfn  = 0,
+		.lpfn  = 0,
+		.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
+	};
+
+	placement->placement = &placements;
+	placement->busy_placement = &placements;
+	placement->num_placement = 1;
+	placement->num_busy_placement = 1;
+	return;
+}
+
+static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
+				    struct file *filp)
+{
+	return 0;
+}
+
+static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
+					 struct ttm_mem_reg *mem)
+{
+	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
+
+	mem->bus.addr = NULL;
+	mem->bus.offset = 0;
+	mem->bus.size = mem->num_pages << PAGE_SHIFT;
+	mem->bus.base = 0;
+	mem->bus.is_iomem = false;
+	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
+		return -EINVAL;
+	switch (mem->mem_type) {
+	case TTM_PL_SYSTEM:
+	case TTM_PL_TT:
+		/* system memory */
+		return 0;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
+				       struct ttm_mem_reg *mem)
+{
+}
+
+/*
+ * TTM backend functions.
+ */
+struct virtio_gpu_ttm_tt {
+	struct ttm_dma_tt		ttm;
+	struct virtio_gpu_device	*vgdev;
+	u64				offset;
+};
+
+static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
+				       struct ttm_mem_reg *bo_mem)
+{
+	struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
+
+	gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
+	if (!ttm->num_pages)
+		WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
+		     ttm->num_pages, bo_mem, ttm);
+
+	/* Not implemented */
+	return 0;
+}
+
+static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
+{
+	/* Not implemented */
+	return 0;
+}
+
+static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
+{
+	struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
+
+	ttm_dma_tt_fini(&gtt->ttm);
+	kfree(gtt);
+}
+
+static struct ttm_backend_func virtio_gpu_backend_func = {
+	.bind = &virtio_gpu_ttm_backend_bind,
+	.unbind = &virtio_gpu_ttm_backend_unbind,
+	.destroy = &virtio_gpu_ttm_backend_destroy,
+};
+
+static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm)
+{
+	if (ttm->state != tt_unpopulated)
+		return 0;
+
+	return ttm_pool_populate(ttm);
+}
+
+static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
+{
+	ttm_pool_unpopulate(ttm);
+}
+
+static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
+					       unsigned long size,
+					       uint32_t page_flags,
+					       struct page *dummy_read_page)
+{
+	struct virtio_gpu_device *vgdev;
+	struct virtio_gpu_ttm_tt *gtt;
+
+	vgdev = virtio_gpu_get_vgdev(bdev);
+	gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
+	if (gtt == NULL)
+		return NULL;
+	gtt->ttm.ttm.func = &virtio_gpu_backend_func;
+	gtt->vgdev = vgdev;
+	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
+			    dummy_read_page)) {
+		kfree(gtt);
+		return NULL;
+	}
+	return &gtt->ttm.ttm;
+}
+
+static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
+				 struct ttm_mem_reg *new_mem)
+{
+	struct ttm_mem_reg *old_mem = &bo->mem;
+
+	BUG_ON(old_mem->mm_node != NULL);
+	*old_mem = *new_mem;
+	new_mem->mm_node = NULL;
+}
+
+static int virtio_gpu_bo_move(struct ttm_buffer_object *bo,
+			      bool evict, bool interruptible,
+			      bool no_wait_gpu,
+			      struct ttm_mem_reg *new_mem)
+{
+	virtio_gpu_move_null(bo, new_mem);
+	return 0;
+}
+
+static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
+				      struct ttm_mem_reg *new_mem)
+{
+	struct virtio_gpu_object *bo;
+	struct virtio_gpu_device *vgdev;
+
+	bo = container_of(tbo, struct virtio_gpu_object, tbo);
+	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
+
+	if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
+		if (bo->hw_res_handle)
+			virtio_gpu_cmd_resource_inval_backing(vgdev,
+							   bo->hw_res_handle);
+
+	} else if (new_mem->placement & TTM_PL_FLAG_TT) {
+		if (bo->hw_res_handle) {
+			virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
+						 NULL);
+		}
+	}
+}
+
+static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
+{
+	struct virtio_gpu_object *bo;
+	struct virtio_gpu_device *vgdev;
+
+	bo = container_of(tbo, struct virtio_gpu_object, tbo);
+	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
+
+	if (bo->pages)
+		virtio_gpu_object_free_sg_table(bo);
+}
+
+static struct ttm_bo_driver virtio_gpu_bo_driver = {
+	.ttm_tt_create = &virtio_gpu_ttm_tt_create,
+	.ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
+	.ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
+	.invalidate_caches = &virtio_gpu_invalidate_caches,
+	.init_mem_type = &virtio_gpu_init_mem_type,
+	.evict_flags = &virtio_gpu_evict_flags,
+	.move = &virtio_gpu_bo_move,
+	.verify_access = &virtio_gpu_verify_access,
+	.io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
+	.io_mem_free = &virtio_gpu_ttm_io_mem_free,
+	.move_notify = &virtio_gpu_bo_move_notify,
+	.swap_notify = &virtio_gpu_bo_swap_notify,
+};
+
+int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
+{
+	int r;
+
+	r = virtio_gpu_ttm_global_init(vgdev);
+	if (r)
+		return r;
+	/* No others user of address space so set it to 0 */
+	r = ttm_bo_device_init(&vgdev->mman.bdev,
+			       vgdev->mman.bo_global_ref.ref.object,
+			       &virtio_gpu_bo_driver,
+			       vgdev->ddev->anon_inode->i_mapping,
+			       DRM_FILE_PAGE_OFFSET, 0);
+	if (r) {
+		DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
+		goto err_dev_init;
+		return r;
+	}
+
+	r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
+	if (r) {
+		DRM_ERROR("Failed initializing GTT heap.\n");
+		goto err_mm_init;
+		return r;
+	}
+	return 0;
+
+err_mm_init:
+	ttm_bo_device_release(&vgdev->mman.bdev);
+err_dev_init:
+	virtio_gpu_ttm_global_fini(vgdev);
+	return r;
+}
+
+void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
+{
+	ttm_bo_device_release(&vgdev->mman.bdev);
+	virtio_gpu_ttm_global_fini(vgdev);
+	DRM_INFO("virtio_gpu: ttm finalized\n");
+}

drivers/gpu/drm/virtio/virtgpu_vq.c

+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * Authors:
+ *    Dave Airlie <airlied@redhat.com>
+ *    Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * 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
+ * VA LINUX SYSTEMS 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"
+#include <linux/virtio.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_ring.h>
+
+#define MAX_INLINE_CMD_SIZE   96
+#define MAX_INLINE_RESP_SIZE  24
+#define VBUFFER_SIZE          (sizeof(struct virtio_gpu_vbuffer) \
+			       + MAX_INLINE_CMD_SIZE		 \
+			       + MAX_INLINE_RESP_SIZE)
+
+void virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
+				uint32_t *resid)
+{
+	int handle;
+
+	idr_preload(GFP_KERNEL);
+	spin_lock(&vgdev->resource_idr_lock);
+	handle = idr_alloc(&vgdev->resource_idr, NULL, 1, 0, GFP_NOWAIT);
+	spin_unlock(&vgdev->resource_idr_lock);
+	idr_preload_end();
+	*resid = handle;
+}
+
+void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
+{
+	spin_lock(&vgdev->resource_idr_lock);
+	idr_remove(&vgdev->resource_idr, id);
+	spin_unlock(&vgdev->resource_idr_lock);
+}
+
+void virtio_gpu_ctrl_ack(struct virtqueue *vq)
+{
+	struct drm_device *dev = vq->vdev->priv;
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	schedule_work(&vgdev->ctrlq.dequeue_work);
+}
+
+void virtio_gpu_cursor_ack(struct virtqueue *vq)
+{
+	struct drm_device *dev = vq->vdev->priv;
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	schedule_work(&vgdev->cursorq.dequeue_work);
+}
+
+int virtio_gpu_alloc_vbufs(struct virtio_gpu_device *vgdev)
+{
+	struct virtio_gpu_vbuffer *vbuf;
+	int i, size, count = 0;
+	void *ptr;
+
+	INIT_LIST_HEAD(&vgdev->free_vbufs);
+	count += virtqueue_get_vring_size(vgdev->ctrlq.vq);
+	count += virtqueue_get_vring_size(vgdev->cursorq.vq);
+	size = count * VBUFFER_SIZE;
+	DRM_INFO("virtio vbuffers: %d bufs, %zdB each, %dkB total.\n",
+		 count, VBUFFER_SIZE, size / 1024);
+
+	vgdev->vbufs = kzalloc(size, GFP_KERNEL);
+	if (!vgdev->vbufs)
+		return -ENOMEM;
+
+	for (i = 0, ptr = vgdev->vbufs;
+	     i < count;
+	     i++, ptr += VBUFFER_SIZE) {
+		vbuf = ptr;
+		list_add(&vbuf->list, &vgdev->free_vbufs);
+	}
+	return 0;
+}
+
+void virtio_gpu_free_vbufs(struct virtio_gpu_device *vgdev)
+{
+	struct virtio_gpu_vbuffer *vbuf;
+	int i, count = 0;
+
+	count += virtqueue_get_vring_size(vgdev->ctrlq.vq);
+	count += virtqueue_get_vring_size(vgdev->cursorq.vq);
+
+	for (i = 0; i < count; i++) {
+		if (WARN_ON(list_empty(&vgdev->free_vbufs)))
+			return;
+		vbuf = list_first_entry(&vgdev->free_vbufs,
+					struct virtio_gpu_vbuffer, list);
+		list_del(&vbuf->list);
+	}
+	kfree(vgdev->vbufs);
+}
+
+static struct virtio_gpu_vbuffer*
+virtio_gpu_get_vbuf(struct virtio_gpu_device *vgdev,
+		    int size, int resp_size, void *resp_buf,
+		    virtio_gpu_resp_cb resp_cb)
+{
+	struct virtio_gpu_vbuffer *vbuf;
+
+	BUG_ON(list_empty(&vgdev->free_vbufs));
+	vbuf = list_first_entry(&vgdev->free_vbufs,
+				struct virtio_gpu_vbuffer, list);
+	list_del(&vbuf->list);
+	memset(vbuf, 0, VBUFFER_SIZE);
+
+	BUG_ON(size > MAX_INLINE_CMD_SIZE);
+	vbuf->buf = (void *)vbuf + sizeof(*vbuf);
+	vbuf->size = size;
+
+	vbuf->resp_cb = resp_cb;
+	vbuf->resp_size = resp_size;
+	if (resp_size <= MAX_INLINE_RESP_SIZE)
+		vbuf->resp_buf = (void *)vbuf->buf + size;
+	else
+		vbuf->resp_buf = resp_buf;
+	BUG_ON(!vbuf->resp_buf);
+	return vbuf;
+}
+
+static void *virtio_gpu_alloc_cmd(struct virtio_gpu_device *vgdev,
+				  struct virtio_gpu_vbuffer **vbuffer_p,
+				  int size)
+{
+	struct virtio_gpu_vbuffer *vbuf;
+
+	vbuf = virtio_gpu_get_vbuf(vgdev, size,
+				   sizeof(struct virtio_gpu_ctrl_hdr),
+				   NULL, NULL);
+	if (IS_ERR(vbuf)) {
+		*vbuffer_p = NULL;
+		return ERR_CAST(vbuf);
+	}
+	*vbuffer_p = vbuf;
+	return vbuf->buf;
+}
+
+static struct virtio_gpu_update_cursor*
+virtio_gpu_alloc_cursor(struct virtio_gpu_device *vgdev,
+			struct virtio_gpu_vbuffer **vbuffer_p)
+{
+	struct virtio_gpu_vbuffer *vbuf;
+
+	vbuf = virtio_gpu_get_vbuf
+		(vgdev, sizeof(struct virtio_gpu_update_cursor),
+		 0, NULL, NULL);
+	if (IS_ERR(vbuf)) {
+		*vbuffer_p = NULL;
+		return ERR_CAST(vbuf);
+	}
+	*vbuffer_p = vbuf;
+	return (struct virtio_gpu_update_cursor *)vbuf->buf;
+}
+
+static void *virtio_gpu_alloc_cmd_resp(struct virtio_gpu_device *vgdev,
+				       virtio_gpu_resp_cb cb,
+				       struct virtio_gpu_vbuffer **vbuffer_p,
+				       int cmd_size, int resp_size,
+				       void *resp_buf)
+{
+	struct virtio_gpu_vbuffer *vbuf;
+
+	vbuf = virtio_gpu_get_vbuf(vgdev, cmd_size,
+				   resp_size, resp_buf, cb);
+	if (IS_ERR(vbuf)) {
+		*vbuffer_p = NULL;
+		return ERR_CAST(vbuf);
+	}
+	*vbuffer_p = vbuf;
+	return (struct virtio_gpu_command *)vbuf->buf;
+}
+
+static void free_vbuf(struct virtio_gpu_device *vgdev,
+		      struct virtio_gpu_vbuffer *vbuf)
+{
+	if (vbuf->resp_size > MAX_INLINE_RESP_SIZE)
+		kfree(vbuf->resp_buf);
+	kfree(vbuf->data_buf);
+	list_add(&vbuf->list, &vgdev->free_vbufs);
+}
+
+static void reclaim_vbufs(struct virtqueue *vq, struct list_head *reclaim_list)
+{
+	struct virtio_gpu_vbuffer *vbuf;
+	unsigned int len;
+	int freed = 0;
+
+	while ((vbuf = virtqueue_get_buf(vq, &len))) {
+		list_add_tail(&vbuf->list, reclaim_list);
+		freed++;
+	}
+	if (freed == 0)
+		DRM_DEBUG("Huh? zero vbufs reclaimed");
+}
+
+void virtio_gpu_dequeue_ctrl_func(struct work_struct *work)
+{
+	struct virtio_gpu_device *vgdev =
+		container_of(work, struct virtio_gpu_device,
+			     ctrlq.dequeue_work);
+	struct list_head reclaim_list;
+	struct virtio_gpu_vbuffer *entry, *tmp;
+	struct virtio_gpu_ctrl_hdr *resp;
+	u64 fence_id = 0;
+
+	INIT_LIST_HEAD(&reclaim_list);
+	spin_lock(&vgdev->ctrlq.qlock);
+	do {
+		virtqueue_disable_cb(vgdev->ctrlq.vq);
+		reclaim_vbufs(vgdev->ctrlq.vq, &reclaim_list);
+
+	} while (!virtqueue_enable_cb(vgdev->ctrlq.vq));
+	spin_unlock(&vgdev->ctrlq.qlock);
+
+	list_for_each_entry_safe(entry, tmp, &reclaim_list, list) {
+		resp = (struct virtio_gpu_ctrl_hdr *)entry->resp_buf;
+		if (resp->type != cpu_to_le32(VIRTIO_GPU_RESP_OK_NODATA))
+			DRM_DEBUG("response 0x%x\n", le32_to_cpu(resp->type));
+		if (resp->flags & cpu_to_le32(VIRTIO_GPU_FLAG_FENCE)) {
+			u64 f = le64_to_cpu(resp->fence_id);
+
+			if (fence_id > f) {
+				DRM_ERROR("%s: Oops: fence %llx -> %llx\n",
+					  __func__, fence_id, f);
+			} else {
+				fence_id = f;
+			}
+		}
+		if (entry->resp_cb)
+			entry->resp_cb(vgdev, entry);
+
+		list_del(&entry->list);
+		free_vbuf(vgdev, entry);
+	}
+	wake_up(&vgdev->ctrlq.ack_queue);
+
+	if (fence_id)
+		virtio_gpu_fence_event_process(vgdev, fence_id);
+}
+
+void virtio_gpu_dequeue_cursor_func(struct work_struct *work)
+{
+	struct virtio_gpu_device *vgdev =
+		container_of(work, struct virtio_gpu_device,
+			     cursorq.dequeue_work);
+	struct list_head reclaim_list;
+	struct virtio_gpu_vbuffer *entry, *tmp;
+
+	INIT_LIST_HEAD(&reclaim_list);
+	spin_lock(&vgdev->cursorq.qlock);
+	do {
+		virtqueue_disable_cb(vgdev->cursorq.vq);
+		reclaim_vbufs(vgdev->cursorq.vq, &reclaim_list);
+	} while (!virtqueue_enable_cb(vgdev->cursorq.vq));
+	spin_unlock(&vgdev->cursorq.qlock);
+
+	list_for_each_entry_safe(entry, tmp, &reclaim_list, list) {
+		list_del(&entry->list);
+		free_vbuf(vgdev, entry);
+	}
+	wake_up(&vgdev->cursorq.ack_queue);
+}
+
+static int virtio_gpu_queue_ctrl_buffer(struct virtio_gpu_device *vgdev,
+					struct virtio_gpu_vbuffer *vbuf)
+{
+	struct virtqueue *vq = vgdev->ctrlq.vq;
+	struct scatterlist *sgs[3], vcmd, vout, vresp;
+	int outcnt = 0, incnt = 0;
+	int ret;
+
+	if (!vgdev->vqs_ready)
+		return -ENODEV;
+
+	sg_init_one(&vcmd, vbuf->buf, vbuf->size);
+	sgs[outcnt+incnt] = &vcmd;
+	outcnt++;
+
+	if (vbuf->data_size) {
+		sg_init_one(&vout, vbuf->data_buf, vbuf->data_size);
+		sgs[outcnt + incnt] = &vout;
+		outcnt++;
+	}
+
+	if (vbuf->resp_size) {
+		sg_init_one(&vresp, vbuf->resp_buf, vbuf->resp_size);
+		sgs[outcnt + incnt] = &vresp;
+		incnt++;
+	}
+
+	spin_lock(&vgdev->ctrlq.qlock);
+retry:
+	ret = virtqueue_add_sgs(vq, sgs, outcnt, incnt, vbuf, GFP_ATOMIC);
+	if (ret == -ENOSPC) {
+		spin_unlock(&vgdev->ctrlq.qlock);
+		wait_event(vgdev->ctrlq.ack_queue, vq->num_free);
+		spin_lock(&vgdev->ctrlq.qlock);
+		goto retry;
+	} else {
+		virtqueue_kick(vq);
+	}
+	spin_unlock(&vgdev->ctrlq.qlock);
+
+	if (!ret)
+		ret = vq->num_free;
+	return ret;
+}
+
+static int virtio_gpu_queue_cursor(struct virtio_gpu_device *vgdev,
+				   struct virtio_gpu_vbuffer *vbuf)
+{
+	struct virtqueue *vq = vgdev->cursorq.vq;
+	struct scatterlist *sgs[1], ccmd;
+	int ret;
+	int outcnt;
+
+	if (!vgdev->vqs_ready)
+		return -ENODEV;
+
+	sg_init_one(&ccmd, vbuf->buf, vbuf->size);
+	sgs[0] = &ccmd;
+	outcnt = 1;
+
+	spin_lock(&vgdev->cursorq.qlock);
+retry:
+	ret = virtqueue_add_sgs(vq, sgs, outcnt, 0, vbuf, GFP_ATOMIC);
+	if (ret == -ENOSPC) {
+		spin_unlock(&vgdev->cursorq.qlock);
+		wait_event(vgdev->cursorq.ack_queue, vq->num_free);
+		spin_lock(&vgdev->cursorq.qlock);
+		goto retry;
+	} else {
+		virtqueue_kick(vq);
+	}
+
+	spin_unlock(&vgdev->cursorq.qlock);
+
+	if (!ret)
+		ret = vq->num_free;
+	return ret;
+}
+
+/* just create gem objects for userspace and long lived objects,
+   just use dma_alloced pages for the queue objects? */
+
+/* create a basic resource */
+void virtio_gpu_cmd_create_resource(struct virtio_gpu_device *vgdev,
+				    uint32_t resource_id,
+				    uint32_t format,
+				    uint32_t width,
+				    uint32_t height)
+{
+	struct virtio_gpu_resource_create_2d *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+
+	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+	memset(cmd_p, 0, sizeof(*cmd_p));
+
+	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_CREATE_2D);
+	cmd_p->resource_id = cpu_to_le32(resource_id);
+	cmd_p->format = cpu_to_le32(format);
+	cmd_p->width = cpu_to_le32(width);
+	cmd_p->height = cpu_to_le32(height);
+
+	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+}
+
+void virtio_gpu_cmd_unref_resource(struct virtio_gpu_device *vgdev,
+				   uint32_t resource_id)
+{
+	struct virtio_gpu_resource_unref *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+
+	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+	memset(cmd_p, 0, sizeof(*cmd_p));
+
+	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_UNREF);
+	cmd_p->resource_id = cpu_to_le32(resource_id);
+
+	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+}
+
+void virtio_gpu_cmd_resource_inval_backing(struct virtio_gpu_device *vgdev,
+					   uint32_t resource_id)
+{
+	struct virtio_gpu_resource_detach_backing *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+
+	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+	memset(cmd_p, 0, sizeof(*cmd_p));
+
+	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING);
+	cmd_p->resource_id = cpu_to_le32(resource_id);
+
+	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+}
+
+void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev,
+				uint32_t scanout_id, uint32_t resource_id,
+				uint32_t width, uint32_t height,
+				uint32_t x, uint32_t y)
+{
+	struct virtio_gpu_set_scanout *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+
+	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+	memset(cmd_p, 0, sizeof(*cmd_p));
+
+	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_SET_SCANOUT);
+	cmd_p->resource_id = cpu_to_le32(resource_id);
+	cmd_p->scanout_id = cpu_to_le32(scanout_id);
+	cmd_p->r.width = cpu_to_le32(width);
+	cmd_p->r.height = cpu_to_le32(height);
+	cmd_p->r.x = cpu_to_le32(x);
+	cmd_p->r.y = cpu_to_le32(y);
+
+	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+}
+
+void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev,
+				   uint32_t resource_id,
+				   uint32_t x, uint32_t y,
+				   uint32_t width, uint32_t height)
+{
+	struct virtio_gpu_resource_flush *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+
+	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+	memset(cmd_p, 0, sizeof(*cmd_p));
+
+	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_FLUSH);
+	cmd_p->resource_id = cpu_to_le32(resource_id);
+	cmd_p->r.width = cpu_to_le32(width);
+	cmd_p->r.height = cpu_to_le32(height);
+	cmd_p->r.x = cpu_to_le32(x);
+	cmd_p->r.y = cpu_to_le32(y);
+
+	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+}
+
+void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev,
+					uint32_t resource_id, uint64_t offset,
+					__le32 width, __le32 height,
+					__le32 x, __le32 y,
+					struct virtio_gpu_fence **fence)
+{
+	struct virtio_gpu_transfer_to_host_2d *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+
+	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+	memset(cmd_p, 0, sizeof(*cmd_p));
+
+	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D);
+	cmd_p->resource_id = cpu_to_le32(resource_id);
+	cmd_p->offset = cpu_to_le64(offset);
+	cmd_p->r.width = width;
+	cmd_p->r.height = height;
+	cmd_p->r.x = x;
+	cmd_p->r.y = y;
+
+	if (fence)
+		virtio_gpu_fence_emit(vgdev, &cmd_p->hdr, fence);
+	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+}
+
+static void
+virtio_gpu_cmd_resource_attach_backing(struct virtio_gpu_device *vgdev,
+				       uint32_t resource_id,
+				       struct virtio_gpu_mem_entry *ents,
+				       uint32_t nents,
+				       struct virtio_gpu_fence **fence)
+{
+	struct virtio_gpu_resource_attach_backing *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+
+	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+	memset(cmd_p, 0, sizeof(*cmd_p));
+
+	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING);
+	cmd_p->resource_id = cpu_to_le32(resource_id);
+	cmd_p->nr_entries = cpu_to_le32(nents);
+
+	vbuf->data_buf = ents;
+	vbuf->data_size = sizeof(*ents) * nents;
+
+	if (fence)
+		virtio_gpu_fence_emit(vgdev, &cmd_p->hdr, fence);
+	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+}
+
+static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev,
+					       struct virtio_gpu_vbuffer *vbuf)
+{
+	struct virtio_gpu_resp_display_info *resp =
+		(struct virtio_gpu_resp_display_info *)vbuf->resp_buf;
+	int i;
+
+	spin_lock(&vgdev->display_info_lock);
+	for (i = 0; i < vgdev->num_scanouts; i++) {
+		vgdev->outputs[i].info = resp->pmodes[i];
+		if (resp->pmodes[i].enabled) {
+			DRM_DEBUG("output %d: %dx%d+%d+%d", i,
+				  le32_to_cpu(resp->pmodes[i].r.width),
+				  le32_to_cpu(resp->pmodes[i].r.height),
+				  le32_to_cpu(resp->pmodes[i].r.x),
+				  le32_to_cpu(resp->pmodes[i].r.y));
+		} else {
+			DRM_DEBUG("output %d: disabled", i);
+		}
+	}
+
+	spin_unlock(&vgdev->display_info_lock);
+	wake_up(&vgdev->resp_wq);
+
+	if (!drm_helper_hpd_irq_event(vgdev->ddev))
+		drm_kms_helper_hotplug_event(vgdev->ddev);
+}
+
+int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev)
+{
+	struct virtio_gpu_ctrl_hdr *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+	void *resp_buf;
+
+	resp_buf = kzalloc(sizeof(struct virtio_gpu_resp_display_info),
+			   GFP_KERNEL);
+	if (!resp_buf)
+		return -ENOMEM;
+
+	cmd_p = virtio_gpu_alloc_cmd_resp
+		(vgdev, &virtio_gpu_cmd_get_display_info_cb, &vbuf,
+		 sizeof(*cmd_p), sizeof(struct virtio_gpu_resp_display_info),
+		 resp_buf);
+	memset(cmd_p, 0, sizeof(*cmd_p));
+
+	cmd_p->type = cpu_to_le32(VIRTIO_GPU_CMD_GET_DISPLAY_INFO);
+	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	return 0;
+}
+
+int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
+			     struct virtio_gpu_object *obj,
+			     uint32_t resource_id,
+			     struct virtio_gpu_fence **fence)
+{
+	struct virtio_gpu_mem_entry *ents;
+	struct scatterlist *sg;
+	int si;
+
+	if (!obj->pages) {
+		int ret;
+		ret = virtio_gpu_object_get_sg_table(vgdev, obj);
+		if (ret)
+			return ret;
+	}
+
+	/* gets freed when the ring has consumed it */
+	ents = kmalloc_array(obj->pages->nents,
+			     sizeof(struct virtio_gpu_mem_entry),
+			     GFP_KERNEL);
+	if (!ents) {
+		DRM_ERROR("failed to allocate ent list\n");
+		return -ENOMEM;
+	}
+
+	for_each_sg(obj->pages->sgl, sg, obj->pages->nents, si) {
+		ents[si].addr = cpu_to_le64(sg_phys(sg));
+		ents[si].length = cpu_to_le32(sg->length);
+		ents[si].padding = 0;
+	}
+
+	virtio_gpu_cmd_resource_attach_backing(vgdev, resource_id,
+					       ents, obj->pages->nents,
+					       fence);
+	obj->hw_res_handle = resource_id;
+	return 0;
+}
+
+void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,
+			    struct virtio_gpu_output *output)
+{
+	struct virtio_gpu_vbuffer *vbuf;
+	struct virtio_gpu_update_cursor *cur_p;
+
+	output->cursor.pos.scanout_id = cpu_to_le32(output->index);
+	cur_p = virtio_gpu_alloc_cursor(vgdev, &vbuf);
+	memcpy(cur_p, &output->cursor, sizeof(output->cursor));
+	virtio_gpu_queue_cursor(vgdev, vbuf);
+}

include/drm/drmP.h

@@ -814,6 +814,7 @@ struct drm_device {
 #endif
 
 	struct platform_device *platformdev; /**< Platform device struture */
+	struct virtio_device *virtdev;
 
 	struct drm_sg_mem *sg;	/**< Scatter gather memory */
 	unsigned int num_crtcs;                  /**< Number of CRTCs on this device */

include/uapi/linux/Kbuild

@@ -430,6 +430,7 @@ header-y += virtio_balloon.h
 header-y += virtio_blk.h
 header-y += virtio_config.h
 header-y += virtio_console.h
+header-y += virtio_gpu.h
 header-y += virtio_ids.h
 header-y += virtio_input.h
 header-y += virtio_net.h

include/uapi/linux/virtio_gpu.h

+/*
+ * Virtio GPU Device
+ *
+ * Copyright Red Hat, Inc. 2013-2014
+ *
+ * Authors:
+ *     Dave Airlie <airlied@redhat.com>
+ *     Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * This header is BSD licensed so anyone can use the definitions
+ * to implement compatible drivers/servers:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of IBM nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef VIRTIO_GPU_HW_H
+#define VIRTIO_GPU_HW_H
+
+enum virtio_gpu_ctrl_type {
+	VIRTIO_GPU_UNDEFINED = 0,
+
+	/* 2d commands */
+	VIRTIO_GPU_CMD_GET_DISPLAY_INFO = 0x0100,
+	VIRTIO_GPU_CMD_RESOURCE_CREATE_2D,
+	VIRTIO_GPU_CMD_RESOURCE_UNREF,
+	VIRTIO_GPU_CMD_SET_SCANOUT,
+	VIRTIO_GPU_CMD_RESOURCE_FLUSH,
+	VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D,
+	VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING,
+	VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING,
+
+	/* cursor commands */
+	VIRTIO_GPU_CMD_UPDATE_CURSOR = 0x0300,
+	VIRTIO_GPU_CMD_MOVE_CURSOR,
+
+	/* success responses */
+	VIRTIO_GPU_RESP_OK_NODATA = 0x1100,
+	VIRTIO_GPU_RESP_OK_DISPLAY_INFO,
+
+	/* error responses */
+	VIRTIO_GPU_RESP_ERR_UNSPEC = 0x1200,
+	VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY,
+	VIRTIO_GPU_RESP_ERR_INVALID_SCANOUT_ID,
+	VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID,
+	VIRTIO_GPU_RESP_ERR_INVALID_CONTEXT_ID,
+	VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER,
+};
+
+#define VIRTIO_GPU_FLAG_FENCE (1 << 0)
+
+struct virtio_gpu_ctrl_hdr {
+	__le32 type;
+	__le32 flags;
+	__le64 fence_id;
+	__le32 ctx_id;
+	__le32 padding;
+};
+
+/* data passed in the cursor vq */
+
+struct virtio_gpu_cursor_pos {
+	__le32 scanout_id;
+	__le32 x;
+	__le32 y;
+	__le32 padding;
+};
+
+/* VIRTIO_GPU_CMD_UPDATE_CURSOR, VIRTIO_GPU_CMD_MOVE_CURSOR */
+struct virtio_gpu_update_cursor {
+	struct virtio_gpu_ctrl_hdr hdr;
+	struct virtio_gpu_cursor_pos pos;  /* update & move */
+	__le32 resource_id;           /* update only */
+	__le32 hot_x;                 /* update only */
+	__le32 hot_y;                 /* update only */
+	__le32 padding;
+};
+
+/* data passed in the control vq, 2d related */
+
+struct virtio_gpu_rect {
+	__le32 x;
+	__le32 y;
+	__le32 width;
+	__le32 height;
+};
+
+/* VIRTIO_GPU_CMD_RESOURCE_UNREF */
+struct virtio_gpu_resource_unref {
+	struct virtio_gpu_ctrl_hdr hdr;
+	__le32 resource_id;
+	__le32 padding;
+};
+
+/* VIRTIO_GPU_CMD_RESOURCE_CREATE_2D: create a 2d resource with a format */
+struct virtio_gpu_resource_create_2d {
+	struct virtio_gpu_ctrl_hdr hdr;
+	__le32 resource_id;
+	__le32 format;
+	__le32 width;
+	__le32 height;
+};
+
+/* VIRTIO_GPU_CMD_SET_SCANOUT */
+struct virtio_gpu_set_scanout {
+	struct virtio_gpu_ctrl_hdr hdr;
+	struct virtio_gpu_rect r;
+	__le32 scanout_id;
+	__le32 resource_id;
+};
+
+/* VIRTIO_GPU_CMD_RESOURCE_FLUSH */
+struct virtio_gpu_resource_flush {
+	struct virtio_gpu_ctrl_hdr hdr;
+	struct virtio_gpu_rect r;
+	__le32 resource_id;
+	__le32 padding;
+};
+
+/* VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D: simple transfer to_host */
+struct virtio_gpu_transfer_to_host_2d {
+	struct virtio_gpu_ctrl_hdr hdr;
+	struct virtio_gpu_rect r;
+	__le64 offset;
+	__le32 resource_id;
+	__le32 padding;
+};
+
+struct virtio_gpu_mem_entry {
+	__le64 addr;
+	__le32 length;
+	__le32 padding;
+};
+
+/* VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING */
+struct virtio_gpu_resource_attach_backing {
+	struct virtio_gpu_ctrl_hdr hdr;
+	__le32 resource_id;
+	__le32 nr_entries;
+};
+
+/* VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING */
+struct virtio_gpu_resource_detach_backing {
+	struct virtio_gpu_ctrl_hdr hdr;
+	__le32 resource_id;
+	__le32 padding;
+};
+
+/* VIRTIO_GPU_RESP_OK_DISPLAY_INFO */
+#define VIRTIO_GPU_MAX_SCANOUTS 16
+struct virtio_gpu_resp_display_info {
+	struct virtio_gpu_ctrl_hdr hdr;
+	struct virtio_gpu_display_one {
+		struct virtio_gpu_rect r;
+		__le32 enabled;
+		__le32 flags;
+	} pmodes[VIRTIO_GPU_MAX_SCANOUTS];
+};
+
+#define VIRTIO_GPU_EVENT_DISPLAY (1 << 0)
+
+struct virtio_gpu_config {
+	__u32 events_read;
+	__u32 events_clear;
+	__u32 num_scanouts;
+	__u32 reserved;
+};
+
+/* simple formats for fbcon/X use */
+enum virtio_gpu_formats {
+	VIRTIO_GPU_FORMAT_B8G8R8A8_UNORM  = 1,
+	VIRTIO_GPU_FORMAT_B8G8R8X8_UNORM  = 2,
+	VIRTIO_GPU_FORMAT_A8R8G8B8_UNORM  = 3,
+	VIRTIO_GPU_FORMAT_X8R8G8B8_UNORM  = 4,
+
+	VIRTIO_GPU_FORMAT_R8G8B8A8_UNORM  = 67,
+	VIRTIO_GPU_FORMAT_X8B8G8R8_UNORM  = 68,
+
+	VIRTIO_GPU_FORMAT_A8B8G8R8_UNORM  = 121,
+	VIRTIO_GPU_FORMAT_R8G8B8X8_UNORM  = 134,
+};
+
+#endif

include/uapi/linux/virtio_ids.h

@@ -39,6 +39,7 @@
 #define VIRTIO_ID_9P		9 /* 9p virtio console */
 #define VIRTIO_ID_RPROC_SERIAL 11 /* virtio remoteproc serial link */
 #define VIRTIO_ID_CAIF	       12 /* Virtio caif */
+#define VIRTIO_ID_GPU          16 /* virtio GPU */
 #define VIRTIO_ID_INPUT        18 /* virtio input */
 
 #endif /* _LINUX_VIRTIO_IDS_H */