LXR linux/drivers/gpu/drm/virtio/virtgpu_drm

   1/*
   2 * Copyright (C) 2015 Red Hat, Inc.
   3 * All Rights Reserved.
   4 *
   5 * Permission is hereby granted, free of charge, to any person obtaining
   6 * a copy of this software and associated documentation files (the
   7 * "Software"), to deal in the Software without restriction, including
   8 * without limitation the rights to use, copy, modify, merge, publish,
   9 * distribute, sublicense, and/or sell copies of the Software, and to
  10 * permit persons to whom the Software is furnished to do so, subject to
  11 * the following conditions:
  12 *
  13 * The above copyright notice and this permission notice (including the
  14 * next paragraph) shall be included in all copies or substantial
  15 * portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24 */
  25
  26#include <linux/pci.h>
  27#include <drm/drm_fb_helper.h>
  28
  29#include "virtgpu_drv.h"
  30
  31static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
  32{
  33        struct apertures_struct *ap;
  34        bool primary;
  35
  36        ap = alloc_apertures(1);
  37        if (!ap)
  38                return;
  39
  40        ap->ranges[0].base = pci_resource_start(pci_dev, 0);
  41        ap->ranges[0].size = pci_resource_len(pci_dev, 0);
  42
  43        primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
  44                & IORESOURCE_ROM_SHADOW;
  45
  46        drm_fb_helper_remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
  47
  48        kfree(ap);
  49}
  50
  51int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
  52{
  53        struct drm_device *dev;
  54        int ret;
  55
  56        dev = drm_dev_alloc(driver, &vdev->dev);
  57        if (IS_ERR(dev))
  58                return PTR_ERR(dev);
  59        vdev->priv = dev;
  60
  61        if (strcmp(vdev->dev.parent->bus->name, "pci") == 0) {
  62                struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
  63                const char *pname = dev_name(&pdev->dev);
  64                bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
  65                char unique[20];
  66
  67                DRM_INFO("pci: %s detected at %s\n",
  68                         vga ? "virtio-vga" : "virtio-gpu-pci",
  69                         pname);
  70                dev->pdev = pdev;
  71                if (vga)
  72                        virtio_pci_kick_out_firmware_fb(pdev);
  73
  74                snprintf(unique, sizeof(unique), "pci:%s", pname);
  75                ret = drm_dev_set_unique(dev, unique);
  76                if (ret)
  77                        goto err_free;
  78
  79        }
  80
  81        ret = drm_dev_register(dev, 0);
  82        if (ret)
  83                goto err_free;
  84
  85        return 0;
  86
  87err_free:
  88        drm_dev_unref(dev);
  89        return ret;
  90}
  91