251 lines
7.1 KiB
C
251 lines
7.1 KiB
C
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/*
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* Copyright (C) 2015 Red Hat, Inc.
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* All Rights Reserved.
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*
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* Authors:
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* Dave Airlie <airlied@redhat.com>
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* Gerd Hoffmann <kraxel@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/module.h>
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#include <linux/console.h>
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#include <linux/pci.h>
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#include <drm/drmP.h>
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#include <drm/drm.h>
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#include "virtgpu_drv.h"
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static struct drm_driver driver;
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static int virtio_gpu_modeset = -1;
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MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
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module_param_named(modeset, virtio_gpu_modeset, int, 0400);
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static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
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{
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struct apertures_struct *ap;
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bool primary;
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ap = alloc_apertures(1);
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if (!ap)
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return;
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ap->ranges[0].base = pci_resource_start(pci_dev, 0);
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ap->ranges[0].size = pci_resource_len(pci_dev, 0);
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primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
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& IORESOURCE_ROM_SHADOW;
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drm_fb_helper_remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
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kfree(ap);
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}
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static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
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{
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struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
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const char *pname = dev_name(&pdev->dev);
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bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
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char unique[20];
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DRM_INFO("pci: %s detected at %s\n",
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vga ? "virtio-vga" : "virtio-gpu-pci",
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pname);
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dev->pdev = pdev;
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if (vga)
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virtio_pci_kick_out_firmware_fb(pdev);
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/*
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* Normally the drm_dev_set_unique() call is done by core DRM.
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* The following comment covers, why virtio cannot rely on it.
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*
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* Unlike the other virtual GPU drivers, virtio abstracts the
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* underlying bus type by using struct virtio_device.
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*
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* Hence the dev_is_pci() check, used in core DRM, will fail
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* and the unique returned will be the virtio_device "virtio0",
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* while a "pci:..." one is required.
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*
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* A few other ideas were considered:
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* - Extend the dev_is_pci() check [in drm_set_busid] to
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* consider virtio.
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* Seems like a bigger hack than what we have already.
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*
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* - Point drm_device::dev to the parent of the virtio_device
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* Semantic changes:
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* * Using the wrong device for i2c, framebuffer_alloc and
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* prime import.
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* Visual changes:
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* * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
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* will print the wrong information.
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*
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* We could address the latter issues, by introducing
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* drm_device::bus_dev, ... which would be used solely for this.
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*
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* So for the moment keep things as-is, with a bulky comment
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* for the next person who feels like removing this
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* drm_dev_set_unique() quirk.
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*/
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snprintf(unique, sizeof(unique), "pci:%s", pname);
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return drm_dev_set_unique(dev, unique);
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}
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static int virtio_gpu_probe(struct virtio_device *vdev)
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{
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struct drm_device *dev;
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int ret;
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if (vgacon_text_force() && virtio_gpu_modeset == -1)
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return -EINVAL;
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if (virtio_gpu_modeset == 0)
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return -EINVAL;
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dev = drm_dev_alloc(&driver, &vdev->dev);
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if (IS_ERR(dev))
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return PTR_ERR(dev);
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vdev->priv = dev;
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if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
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ret = virtio_gpu_pci_quirk(dev, vdev);
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if (ret)
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goto err_free;
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}
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ret = virtio_gpu_init(dev);
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if (ret)
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goto err_free;
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ret = drm_dev_register(dev, 0);
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if (ret)
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goto err_free;
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drm_fbdev_generic_setup(vdev->priv, 32);
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return 0;
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err_free:
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drm_dev_put(dev);
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return ret;
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}
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static void virtio_gpu_remove(struct virtio_device *vdev)
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{
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struct drm_device *dev = vdev->priv;
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drm_dev_unregister(dev);
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virtio_gpu_deinit(dev);
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drm_put_dev(dev);
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}
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static void virtio_gpu_config_changed(struct virtio_device *vdev)
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{
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struct drm_device *dev = vdev->priv;
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struct virtio_gpu_device *vgdev = dev->dev_private;
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schedule_work(&vgdev->config_changed_work);
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}
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static struct virtio_device_id id_table[] = {
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{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
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{ 0 },
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};
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static unsigned int features[] = {
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#ifdef __LITTLE_ENDIAN
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/*
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* Gallium command stream send by virgl is native endian.
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* Because of that we only support little endian guests on
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* little endian hosts.
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*/
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VIRTIO_GPU_F_VIRGL,
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#endif
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VIRTIO_GPU_F_EDID,
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};
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static struct virtio_driver virtio_gpu_driver = {
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.feature_table = features,
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.feature_table_size = ARRAY_SIZE(features),
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.driver.name = KBUILD_MODNAME,
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.driver.owner = THIS_MODULE,
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.id_table = id_table,
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.probe = virtio_gpu_probe,
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.remove = virtio_gpu_remove,
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.config_changed = virtio_gpu_config_changed
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};
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module_virtio_driver(virtio_gpu_driver);
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MODULE_DEVICE_TABLE(virtio, id_table);
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MODULE_DESCRIPTION("Virtio GPU driver");
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MODULE_LICENSE("GPL and additional rights");
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MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
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MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
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MODULE_AUTHOR("Alon Levy");
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static const struct file_operations virtio_gpu_driver_fops = {
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.owner = THIS_MODULE,
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.open = drm_open,
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.mmap = virtio_gpu_mmap,
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.poll = drm_poll,
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.read = drm_read,
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.unlocked_ioctl = drm_ioctl,
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.release = drm_release,
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.compat_ioctl = drm_compat_ioctl,
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.llseek = noop_llseek,
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};
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static struct drm_driver driver = {
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.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_RENDER | DRIVER_ATOMIC,
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.open = virtio_gpu_driver_open,
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.postclose = virtio_gpu_driver_postclose,
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.dumb_create = virtio_gpu_mode_dumb_create,
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.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
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#if defined(CONFIG_DEBUG_FS)
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.debugfs_init = virtio_gpu_debugfs_init,
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#endif
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.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
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.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
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.gem_prime_export = drm_gem_prime_export,
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.gem_prime_import = drm_gem_prime_import,
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.gem_prime_get_sg_table = virtgpu_gem_prime_get_sg_table,
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.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
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.gem_prime_vmap = virtgpu_gem_prime_vmap,
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.gem_prime_vunmap = virtgpu_gem_prime_vunmap,
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.gem_prime_mmap = virtgpu_gem_prime_mmap,
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.gem_free_object_unlocked = virtio_gpu_gem_free_object,
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.gem_open_object = virtio_gpu_gem_object_open,
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.gem_close_object = virtio_gpu_gem_object_close,
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.fops = &virtio_gpu_driver_fops,
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.ioctls = virtio_gpu_ioctls,
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.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
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.name = DRIVER_NAME,
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.desc = DRIVER_DESC,
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.date = DRIVER_DATE,
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.major = DRIVER_MAJOR,
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.minor = DRIVER_MINOR,
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.patchlevel = DRIVER_PATCHLEVEL,
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};
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