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_atomic_helper.h>
  35 #include <drm/drm_drv.h>
  36 #include <drm/drm_file.h>
  37
  38 #include "virtgpu_drv.h"
  39
  40 static const struct drm_driver driver;
  41
  42 static int virtio_gpu_modeset = -1;
  43
  44 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
  45 module_param_named(modeset, virtio_gpu_modeset, int, 0400);
  46
  47 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
  48 {
  49         struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
  50         const char *pname = dev_name(&pdev->dev);
  51         bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
  52         char unique[20];
  53
  54         DRM_INFO("pci: %s detected at %s\n",
  55                  vga ? "virtio-vga" : "virtio-gpu-pci",
  56                  pname);
  57         dev->pdev = pdev;
  58         if (vga)
  59                 drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
  60                                                                   "virtiodrmfb");
  61
  62         /*
  63          * Normally the drm_dev_set_unique() call is done by core DRM.
  64          * The following comment covers, why virtio cannot rely on it.
  65          *
  66          * Unlike the other virtual GPU drivers, virtio abstracts the
  67          * underlying bus type by using struct virtio_device.
  68          *
  69          * Hence the dev_is_pci() check, used in core DRM, will fail
  70          * and the unique returned will be the virtio_device "virtio0",
  71          * while a "pci:..." one is required.
  72          *
  73          * A few other ideas were considered:
  74          * - Extend the dev_is_pci() check [in drm_set_busid] to
  75          *   consider virtio.
  76          *   Seems like a bigger hack than what we have already.
  77          *
  78          * - Point drm_device::dev to the parent of the virtio_device
  79          *   Semantic changes:
  80          *   * Using the wrong device for i2c, framebuffer_alloc and
  81          *     prime import.
  82          *   Visual changes:
  83          *   * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
  84          *     will print the wrong information.
  85          *
  86          * We could address the latter issues, by introducing
  87          * drm_device::bus_dev, ... which would be used solely for this.
  88          *
  89          * So for the moment keep things as-is, with a bulky comment
  90          * for the next person who feels like removing this
  91          * drm_dev_set_unique() quirk.
  92          */
  93         snprintf(unique, sizeof(unique), "pci:%s", pname);
  94         return drm_dev_set_unique(dev, unique);
  95 }
  96
  97 static int virtio_gpu_probe(struct virtio_device *vdev)
  98 {
  99         struct drm_device *dev;
 100         int ret;
 101
 102         if (vgacon_text_force() && virtio_gpu_modeset == -1)
 103                 return -EINVAL;
 104
 105         if (virtio_gpu_modeset == 0)
 106                 return -EINVAL;
 107
 108         dev = drm_dev_alloc(&driver, &vdev->dev);
 109         if (IS_ERR(dev))
 110                 return PTR_ERR(dev);
 111         vdev->priv = dev;
 112
 113         if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
 114                 ret = virtio_gpu_pci_quirk(dev, vdev);
 115                 if (ret)
 116                         goto err_free;
 117         }
 118
 119         ret = virtio_gpu_init(dev);
 120         if (ret)
 121                 goto err_free;
 122
 123         ret = drm_dev_register(dev, 0);
 124         if (ret)
 125                 goto err_free;
 126
 127         drm_fbdev_generic_setup(vdev->priv, 32);
 128         return 0;
 129
 130 err_free:
 131         drm_dev_put(dev);
 132         return ret;
 133 }
 134
 135 static void virtio_gpu_remove(struct virtio_device *vdev)
 136 {
 137         struct drm_device *dev = vdev->priv;
 138
 139         drm_dev_unplug(dev);
 140         drm_atomic_helper_shutdown(dev);
 141         virtio_gpu_deinit(dev);
 142         drm_dev_put(dev);
 143 }
 144
 145 static void virtio_gpu_config_changed(struct virtio_device *vdev)
 146 {
 147         struct drm_device *dev = vdev->priv;
 148         struct virtio_gpu_device *vgdev = dev->dev_private;
 149
 150         schedule_work(&vgdev->config_changed_work);
 151 }
 152
 153 static struct virtio_device_id id_table[] = {
 154         { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
 155         { 0 },
 156 };
 157
 158 static unsigned int features[] = {
 159 #ifdef __LITTLE_ENDIAN
 160         /*
 161          * Gallium command stream send by virgl is native endian.
 162          * Because of that we only support little endian guests on
 163          * little endian hosts.
 164          */
 165         VIRTIO_GPU_F_VIRGL,
 166 #endif
 167         VIRTIO_GPU_F_EDID,
 168         VIRTIO_GPU_F_RESOURCE_UUID,
 169         VIRTIO_GPU_F_RESOURCE_BLOB,
 170 };
 171 static struct virtio_driver virtio_gpu_driver = {
 172         .feature_table = features,
 173         .feature_table_size = ARRAY_SIZE(features),
 174         .driver.name = KBUILD_MODNAME,
 175         .driver.owner = THIS_MODULE,
 176         .id_table = id_table,
 177         .probe = virtio_gpu_probe,
 178         .remove = virtio_gpu_remove,
 179         .config_changed = virtio_gpu_config_changed
 180 };
 181
 182 module_virtio_driver(virtio_gpu_driver);
 183
 184 MODULE_DEVICE_TABLE(virtio, id_table);
 185 MODULE_DESCRIPTION("Virtio GPU driver");
 186 MODULE_LICENSE("GPL and additional rights");
 187 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
 188 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
 189 MODULE_AUTHOR("Alon Levy");
 190
 191 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
 192
 193 static const struct drm_driver driver = {
 194         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
 195         .open = virtio_gpu_driver_open,
 196         .postclose = virtio_gpu_driver_postclose,
 197
 198         .dumb_create = virtio_gpu_mode_dumb_create,
 199         .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
 200
 201 #if defined(CONFIG_DEBUG_FS)
 202         .debugfs_init = virtio_gpu_debugfs_init,
 203 #endif
 204         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 205         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 206         .gem_prime_mmap = drm_gem_prime_mmap,
 207         .gem_prime_import = virtgpu_gem_prime_import,
 208         .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
 209
 210         .gem_create_object = virtio_gpu_create_object,
 211         .fops = &virtio_gpu_driver_fops,
 212
 213         .ioctls = virtio_gpu_ioctls,
 214         .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
 215
 216         .name = DRIVER_NAME,
 217         .desc = DRIVER_DESC,
 218         .date = DRIVER_DATE,
 219         .major = DRIVER_MAJOR,
 220         .minor = DRIVER_MINOR,
 221         .patchlevel = DRIVER_PATCHLEVEL,
 222
 223         .release = virtio_gpu_release,
 224 };