drivers/gpu/drm/virtio/virtgpu_drv.c

   1 /*
   2  * Copyright (C) 2015 Red Hat, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Authors:
   6  *    Dave Airlie <airlied@redhat.com>
   7  *    Gerd Hoffmann <kraxel@redhat.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  26  * OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/console.h>
  31 #include <linux/pci.h>
  32
  33 #include <drm/drm.h>
  34 #include <drm/drm_drv.h>
  35 #include <drm/drm_file.h>
  36
  37 #include "virtgpu_drv.h"
  38
  39 static struct drm_driver driver;
  40
  41 static int virtio_gpu_modeset = -1;
  42
  43 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
  44 module_param_named(modeset, virtio_gpu_modeset, int, 0400);
  45
  46 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
  47 {
  48         struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
  49         const char *pname = dev_name(&pdev->dev);
  50         bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
  51         char unique[20];
  52
  53         DRM_INFO("pci: %s detected at %s\n",
  54                  vga ? "virtio-vga" : "virtio-gpu-pci",
  55                  pname);
  56         dev->pdev = pdev;
  57         if (vga)
  58                 drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
  59                                                                   "virtiodrmfb");
  60
  61         /*
  62          * Normally the drm_dev_set_unique() call is done by core DRM.
  63          * The following comment covers, why virtio cannot rely on it.
  64          *
  65          * Unlike the other virtual GPU drivers, virtio abstracts the
  66          * underlying bus type by using struct virtio_device.
  67          *
  68          * Hence the dev_is_pci() check, used in core DRM, will fail
  69          * and the unique returned will be the virtio_device "virtio0",
  70          * while a "pci:..." one is required.
  71          *
  72          * A few other ideas were considered:
  73          * - Extend the dev_is_pci() check [in drm_set_busid] to
  74          *   consider virtio.
  75          *   Seems like a bigger hack than what we have already.
  76          *
  77          * - Point drm_device::dev to the parent of the virtio_device
  78          *   Semantic changes:
  79          *   * Using the wrong device for i2c, framebuffer_alloc and
  80          *     prime import.
  81          *   Visual changes:
  82          *   * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
  83          *     will print the wrong information.
  84          *
  85          * We could address the latter issues, by introducing
  86          * drm_device::bus_dev, ... which would be used solely for this.
  87          *
  88          * So for the moment keep things as-is, with a bulky comment
  89          * for the next person who feels like removing this
  90          * drm_dev_set_unique() quirk.
  91          */
  92         snprintf(unique, sizeof(unique), "pci:%s", pname);
  93         return drm_dev_set_unique(dev, unique);
  94 }
  95
  96 static int virtio_gpu_probe(struct virtio_device *vdev)
  97 {
  98         struct drm_device *dev;
  99         int ret;
 100
 101         if (vgacon_text_force() && virtio_gpu_modeset == -1)
 102                 return -EINVAL;
 103
 104         if (virtio_gpu_modeset == 0)
 105                 return -EINVAL;
 106
 107         dev = drm_dev_alloc(&driver, &vdev->dev);
 108         if (IS_ERR(dev))
 109                 return PTR_ERR(dev);
 110         vdev->priv = dev;
 111
 112         if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
 113                 ret = virtio_gpu_pci_quirk(dev, vdev);
 114                 if (ret)
 115                         goto err_free;
 116         }
 117
 118         ret = virtio_gpu_init(dev);
 119         if (ret)
 120                 goto err_free;
 121
 122         ret = drm_dev_register(dev, 0);
 123         if (ret)
 124                 goto err_free;
 125
 126         drm_fbdev_generic_setup(vdev->priv, 32);
 127         return 0;
 128
 129 err_free:
 130         drm_dev_put(dev);
 131         return ret;
 132 }
 133
 134 static void virtio_gpu_remove(struct virtio_device *vdev)
 135 {
 136         struct drm_device *dev = vdev->priv;
 137
 138         drm_dev_unregister(dev);
 139         virtio_gpu_deinit(dev);
 140         drm_dev_put(dev);
 141 }
 142
 143 static void virtio_gpu_config_changed(struct virtio_device *vdev)
 144 {
 145         struct drm_device *dev = vdev->priv;
 146         struct virtio_gpu_device *vgdev = dev->dev_private;
 147
 148         schedule_work(&vgdev->config_changed_work);
 149 }
 150
 151 static struct virtio_device_id id_table[] = {
 152         { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
 153         { 0 },
 154 };
 155
 156 static unsigned int features[] = {
 157 #ifdef __LITTLE_ENDIAN
 158         /*
 159          * Gallium command stream send by virgl is native endian.
 160          * Because of that we only support little endian guests on
 161          * little endian hosts.
 162          */
 163         VIRTIO_GPU_F_VIRGL,
 164 #endif
 165         VIRTIO_GPU_F_EDID,
 166 };
 167 static struct virtio_driver virtio_gpu_driver = {
 168         .feature_table = features,
 169         .feature_table_size = ARRAY_SIZE(features),
 170         .driver.name = KBUILD_MODNAME,
 171         .driver.owner = THIS_MODULE,
 172         .id_table = id_table,
 173         .probe = virtio_gpu_probe,
 174         .remove = virtio_gpu_remove,
 175         .config_changed = virtio_gpu_config_changed
 176 };
 177
 178 module_virtio_driver(virtio_gpu_driver);
 179
 180 MODULE_DEVICE_TABLE(virtio, id_table);
 181 MODULE_DESCRIPTION("Virtio GPU driver");
 182 MODULE_LICENSE("GPL and additional rights");
 183 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
 184 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
 185 MODULE_AUTHOR("Alon Levy");
 186
 187 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
 188
 189 static struct drm_driver driver = {
 190         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
 191         .open = virtio_gpu_driver_open,
 192         .postclose = virtio_gpu_driver_postclose,
 193
 194         .dumb_create = virtio_gpu_mode_dumb_create,
 195         .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
 196
 197 #if defined(CONFIG_DEBUG_FS)
 198         .debugfs_init = virtio_gpu_debugfs_init,
 199 #endif
 200         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 201         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 202         .gem_prime_mmap = drm_gem_prime_mmap,
 203         .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
 204
 205         .gem_create_object = virtio_gpu_create_object,
 206         .fops = &virtio_gpu_driver_fops,
 207
 208         .ioctls = virtio_gpu_ioctls,
 209         .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
 210
 211         .name = DRIVER_NAME,
 212         .desc = DRIVER_DESC,
 213         .date = DRIVER_DATE,
 214         .major = DRIVER_MAJOR,
 215         .minor = DRIVER_MINOR,
 216         .patchlevel = DRIVER_PATCHLEVEL,
 217 };