Merge branch 'virtio-gpu-drm-next' of git://git.kraxel.org/linux into drm-next

Yay, thanks to Gerd for pull this together.

* 'virtio-gpu-drm-next' of git://git.kraxel.org/linux:
  Add MAINTAINERS entry for virtio-gpu.
  Add virtio gpu driver.
  drm_vblank_get: don't WARN_ON in case vblanks are not initialized
  break kconfig dependency loop

MAINTAINERS

@@ -10571,6 +10571,15 @@ F:	drivers/block/virtio_blk.c
 F:	include/linux/virtio_*.h
 F:	include/uapi/linux/virtio_*.h
 
+VIRTIO GPU DRIVER
+M:	David Airlie <airlied@linux.ie>
+M:	Gerd Hoffmann <kraxel@redhat.com>
+L:	dri-devel@lists.freedesktop.org
+L:	virtualization@lists.linux-foundation.org
+S:	Maintained
+F:	drivers/gpu/drm/virtio/
+F:	include/uapi/linux/virtio_gpu.h
+
 VIRTIO HOST (VHOST)
 M:	"Michael S. Tsirkin" <mst@redhat.com>
 L:	kvm@vger.kernel.org

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-$(CONFIG_DRM_OMAP)	+= omapdrm/
 obj-y			+= tilcdc/
 obj-$(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/drm_irq.c

@@ -1056,6 +1056,9 @@ int drm_vblank_get(struct drm_device *dev, int crtc)
 	unsigned long irqflags;
 	int ret = 0;
 
+	if (!dev->num_crtcs)
+		return -EINVAL;
+
 	if (WARN_ON(crtc >= dev->num_crtcs))
 		return -EINVAL;
 

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);
+}

drivers/iommu/Kconfig

@@ -178,6 +178,9 @@ config OMAP_IOMMU
 	depends on ARM && MMU
 	depends on ARCH_OMAP2PLUS || COMPILE_TEST
 	select IOMMU_API
+	---help---
+	  The OMAP3 media platform drivers depend on iommu support,
+	  if you need them say Y here.
 
 config OMAP_IOMMU_DEBUG
 	bool "Export OMAP IOMMU internals in DebugFS"

drivers/media/platform/Kconfig

@@ -87,8 +87,8 @@ config VIDEO_OMAP3
 	tristate "OMAP 3 Camera support"
 	depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API && ARCH_OMAP3
 	depends on HAS_DMA
+	depends on OMAP_IOMMU
 	select ARM_DMA_USE_IOMMU
-	select OMAP_IOMMU
 	select VIDEOBUF2_DMA_CONTIG
 	select MFD_SYSCON
 	---help---

include/drm/drmP.h

@@ -818,6 +818,7 @@ 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 */