drivers/gpu/drm/virtio/virtgpu_drv.c - linux/torvalds/linux - Git at Google

 /*
  * 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 <drm/drm.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_file.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_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
 {
 	struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
 	const char *pname = dev_name(&pdev->dev);
 	bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
 	char unique[20];

 	DRM_INFO("pci: %s detected at %s\n",
 		 vga ? "virtio-vga" : "virtio-gpu-pci",
 		 pname);
 	dev->pdev = pdev;
 	if (vga)
 		drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
 								  0,
 								  "virtiodrmfb");

 	/*
 	 * Normally the drm_dev_set_unique() call is done by core DRM.
 	 * The following comment covers, why virtio cannot rely on it.
 	 *
 	 * Unlike the other virtual GPU drivers, virtio abstracts the
 	 * underlying bus type by using struct virtio_device.
 	 *
 	 * Hence the dev_is_pci() check, used in core DRM, will fail
 	 * and the unique returned will be the virtio_device "virtio0",
 	 * while a "pci:..." one is required.
 	 *
 	 * A few other ideas were considered:
 	 * - Extend the dev_is_pci() check [in drm_set_busid] to
 	 *   consider virtio.
 	 *   Seems like a bigger hack than what we have already.
 	 *
 	 * - Point drm_device::dev to the parent of the virtio_device
 	 *   Semantic changes:
 	 *   * Using the wrong device for i2c, framebuffer_alloc and
 	 *     prime import.
 	 *   Visual changes:
 	 *   * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
 	 *     will print the wrong information.
 	 *
 	 * We could address the latter issues, by introducing
 	 * drm_device::bus_dev, ... which would be used solely for this.
 	 *
 	 * So for the moment keep things as-is, with a bulky comment
 	 * for the next person who feels like removing this
 	 * drm_dev_set_unique() quirk.
 	 */
 	snprintf(unique, sizeof(unique), "pci:%s", pname);
 	return drm_dev_set_unique(dev, unique);
 }

 static int virtio_gpu_probe(struct virtio_device *vdev)
 {
 	struct drm_device *dev;
 	int ret;

 	if (vgacon_text_force() && virtio_gpu_modeset == -1)
 		return -EINVAL;

 	if (virtio_gpu_modeset == 0)
 		return -EINVAL;

 	dev = drm_dev_alloc(&driver, &vdev->dev);
 	if (IS_ERR(dev))
 		return PTR_ERR(dev);
 	vdev->priv = dev;

 	if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
 		ret = virtio_gpu_pci_quirk(dev, vdev);
 		if (ret)
 			goto err_free;
 	}

 	ret = virtio_gpu_init(dev);
 	if (ret)
 		goto err_free;

 	ret = drm_dev_register(dev, 0);
 	if (ret)
 		goto err_free;

 	drm_fbdev_generic_setup(vdev->priv, 32);
 	return 0;

 err_free:
 	drm_dev_put(dev);
 	return ret;
 }

 static void virtio_gpu_remove(struct virtio_device *vdev)
 {
 	struct drm_device *dev = vdev->priv;

 	drm_dev_unregister(dev);
 	virtio_gpu_deinit(dev);
 	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[] = {
 #ifdef __LITTLE_ENDIAN
 	/*
 	 * Gallium command stream send by virgl is native endian.
 	 * Because of that we only support little endian guests on
 	 * little endian hosts.
 	 */
 	VIRTIO_GPU_F_VIRGL,
 #endif
 	VIRTIO_GPU_F_EDID,
 };
 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,
 	.compat_ioctl = drm_compat_ioctl,
 	.llseek = noop_llseek,
 };

 static struct drm_driver driver = {
 	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
 	.open = virtio_gpu_driver_open,
 	.postclose = virtio_gpu_driver_postclose,

 	.dumb_create = virtio_gpu_mode_dumb_create,
 	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,

 #if defined(CONFIG_DEBUG_FS)
 	.debugfs_init = virtio_gpu_debugfs_init,
 #endif
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_prime_get_sg_table = virtgpu_gem_prime_get_sg_table,
 	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
 	.gem_prime_vmap = virtgpu_gem_prime_vmap,
 	.gem_prime_vunmap = virtgpu_gem_prime_vunmap,
 	.gem_prime_mmap = virtgpu_gem_prime_mmap,

 	.gem_free_object_unlocked = virtio_gpu_gem_free_object,
 	.gem_open_object = virtio_gpu_gem_object_open,
 	.gem_close_object = virtio_gpu_gem_object_close,
 	.fops = &virtio_gpu_driver_fops,

 	.ioctls = virtio_gpu_ioctls,
 	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,

 	.name = DRIVER_NAME,
 	.desc = DRIVER_DESC,
 	.date = DRIVER_DATE,
 	.major = DRIVER_MAJOR,
 	.minor = DRIVER_MINOR,
 	.patchlevel = DRIVER_PATCHLEVEL,
 };
	/*
	* 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 <drm/drm.h>
	#include <drm/drm_drv.h>
	#include <drm/drm_file.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_pci_quirk(struct drm_device dev, struct virtio_device vdev)
	{
	struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
	const char *pname = dev_name(&pdev->dev);
	bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
	char unique[20];

	DRM_INFO("pci: %s detected at %s\n",
	vga ? "virtio-vga" : "virtio-gpu-pci",
	pname);
	dev->pdev = pdev;
	if (vga)
	drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
	0,
	"virtiodrmfb");

	/*
	* Normally the drm_dev_set_unique() call is done by core DRM.
	* The following comment covers, why virtio cannot rely on it.
	*
	* Unlike the other virtual GPU drivers, virtio abstracts the
	* underlying bus type by using struct virtio_device.
	*
	* Hence the dev_is_pci() check, used in core DRM, will fail
	* and the unique returned will be the virtio_device "virtio0",
	* while a "pci:..." one is required.
	*
	* A few other ideas were considered:
	* - Extend the dev_is_pci() check [in drm_set_busid] to
	* consider virtio.
	* Seems like a bigger hack than what we have already.
	*
	* - Point drm_device::dev to the parent of the virtio_device
	* Semantic changes:
	* * Using the wrong device for i2c, framebuffer_alloc and
	* prime import.
	* Visual changes:
	* * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
	* will print the wrong information.
	*
	* We could address the latter issues, by introducing
	* drm_device::bus_dev, ... which would be used solely for this.
	*
	* So for the moment keep things as-is, with a bulky comment
	* for the next person who feels like removing this
	* drm_dev_set_unique() quirk.
	*/
	snprintf(unique, sizeof(unique), "pci:%s", pname);
	return drm_dev_set_unique(dev, unique);
	}

	static int virtio_gpu_probe(struct virtio_device *vdev)
	{
	struct drm_device *dev;
	int ret;

	if (vgacon_text_force() && virtio_gpu_modeset == -1)
	return -EINVAL;

	if (virtio_gpu_modeset == 0)
	return -EINVAL;

	dev = drm_dev_alloc(&driver, &vdev->dev);
	if (IS_ERR(dev))
	return PTR_ERR(dev);
	vdev->priv = dev;

	if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
	ret = virtio_gpu_pci_quirk(dev, vdev);
	if (ret)
	goto err_free;
	}

	ret = virtio_gpu_init(dev);
	if (ret)
	goto err_free;

	ret = drm_dev_register(dev, 0);
	if (ret)
	goto err_free;

	drm_fbdev_generic_setup(vdev->priv, 32);
	return 0;

	err_free:
	drm_dev_put(dev);
	return ret;
	}

	static void virtio_gpu_remove(struct virtio_device *vdev)
	{
	struct drm_device *dev = vdev->priv;

	drm_dev_unregister(dev);
	virtio_gpu_deinit(dev);
	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[] = {
	#ifdef __LITTLE_ENDIAN
	/*
	* Gallium command stream send by virgl is native endian.
	* Because of that we only support little endian guests on
	* little endian hosts.
	*/
	VIRTIO_GPU_F_VIRGL,
	#endif
	VIRTIO_GPU_F_EDID,
	};
	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,
	.compat_ioctl = drm_compat_ioctl,
	.llseek = noop_llseek,
	};

	static struct drm_driver driver = {
	.driver_features = DRIVER_MODESET \| DRIVER_GEM \| DRIVER_RENDER \| DRIVER_ATOMIC,
	.open = virtio_gpu_driver_open,
	.postclose = virtio_gpu_driver_postclose,

	.dumb_create = virtio_gpu_mode_dumb_create,
	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,

	#if defined(CONFIG_DEBUG_FS)
	.debugfs_init = virtio_gpu_debugfs_init,
	#endif
	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_get_sg_table = virtgpu_gem_prime_get_sg_table,
	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
	.gem_prime_vmap = virtgpu_gem_prime_vmap,
	.gem_prime_vunmap = virtgpu_gem_prime_vunmap,
	.gem_prime_mmap = virtgpu_gem_prime_mmap,

	.gem_free_object_unlocked = virtio_gpu_gem_free_object,
	.gem_open_object = virtio_gpu_gem_object_open,
	.gem_close_object = virtio_gpu_gem_object_close,
	.fops = &virtio_gpu_driver_fops,

	.ioctls = virtio_gpu_ioctls,
	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,

	.name = DRIVER_NAME,
	.desc = DRIVER_DESC,
	.date = DRIVER_DATE,
	.major = DRIVER_MAJOR,
	.minor = DRIVER_MINOR,
	.patchlevel = DRIVER_PATCHLEVEL,
	};