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/*
* 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/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_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_PRIME | 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
.gem_prime_export = drm_gem_prime_export,
.gem_prime_import = drm_gem_prime_import,
.gem_prime_pin = virtgpu_gem_prime_pin,
.gem_prime_unpin = virtgpu_gem_prime_unpin,
.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,
};
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