drivers/gpu/drm/virtio/virtgpu_drm_bus.c

   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
  28 #include "virtgpu_drv.h"
  29
  30 static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
  31 {
  32         struct apertures_struct *ap;
  33         bool primary;
  34
  35         ap = alloc_apertures(1);
  36         if (!ap)
  37                 return;
  38
  39         ap->ranges[0].base = pci_resource_start(pci_dev, 0);
  40         ap->ranges[0].size = pci_resource_len(pci_dev, 0);
  41
  42         primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
  43                 & IORESOURCE_ROM_SHADOW;
  44
  45         remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
  46
  47         kfree(ap);
  48 }
  49
  50 int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
  51 {
  52         struct drm_device *dev;
  53         int ret;
  54
  55         dev = drm_dev_alloc(driver, &vdev->dev);
  56         if (!dev)
  57                 return -ENOMEM;
  58         dev->virtdev = vdev;
  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                 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
  64
  65                 DRM_INFO("pci: %s detected\n",
  66                          vga ? "virtio-vga" : "virtio-gpu-pci");
  67                 dev->pdev = pdev;
  68                 if (vga)
  69                         virtio_pci_kick_out_firmware_fb(pdev);
  70         }
  71
  72         ret = drm_dev_register(dev, 0);
  73         if (ret)
  74                 goto err_free;
  75
  76         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
  77                  driver->major, driver->minor, driver->patchlevel,
  78                  driver->date, dev->primary->index);
  79
  80         return 0;
  81
  82 err_free:
  83         drm_dev_unref(dev);
  84         return ret;
  85 }