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 #include <drm/drm_fb_helper.h>
  28
  29 #include "virtgpu_drv.h"
  30
  31 int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master)
  32 {
  33         struct pci_dev *pdev = dev->pdev;
  34
  35         if (pdev) {
  36                 return drm_pci_set_busid(dev, master);
  37         }
  38         return 0;
  39 }
  40
  41 static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
  42 {
  43         struct apertures_struct *ap;
  44         bool primary;
  45
  46         ap = alloc_apertures(1);
  47         if (!ap)
  48                 return;
  49
  50         ap->ranges[0].base = pci_resource_start(pci_dev, 0);
  51         ap->ranges[0].size = pci_resource_len(pci_dev, 0);
  52
  53         primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
  54                 & IORESOURCE_ROM_SHADOW;
  55
  56         drm_fb_helper_remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
  57
  58         kfree(ap);
  59 }
  60
  61 int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
  62 {
  63         struct drm_device *dev;
  64         int ret;
  65
  66         dev = drm_dev_alloc(driver, &vdev->dev);
  67         if (IS_ERR(dev))
  68                 return PTR_ERR(dev);
  69         dev->virtdev = vdev;
  70         vdev->priv = dev;
  71
  72         if (strcmp(vdev->dev.parent->bus->name, "pci") == 0) {
  73                 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
  74                 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
  75
  76                 DRM_INFO("pci: %s detected\n",
  77                          vga ? "virtio-vga" : "virtio-gpu-pci");
  78                 dev->pdev = pdev;
  79                 if (vga)
  80                         virtio_pci_kick_out_firmware_fb(pdev);
  81         }
  82
  83         ret = drm_dev_register(dev, 0);
  84         if (ret)
  85                 goto err_free;
  86
  87         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
  88                  driver->major, driver->minor, driver->patchlevel,
  89                  driver->date, dev->primary->index);
  90
  91         return 0;
  92
  93 err_free:
  94         drm_dev_unref(dev);
  95         return ret;
  96 }