LCOV - code coverage report
Current view: top level - drivers/gpu/drm/virtio - virtgpu_drv.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 1 36 2.8 %
Date: 2022-04-01 14:35:51 Functions: 1 5 20.0 %
Branches: 0 16 0.0 %

           Branch data     Line data    Source code
       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                 :          0 : static int virtio_gpu_probe(struct virtio_device *vdev)
      97                 :            : {
      98                 :          0 :         struct drm_device *dev;
      99                 :          0 :         int ret;
     100                 :            : 
     101   [ #  #  #  # ]:          0 :         if (vgacon_text_force() && virtio_gpu_modeset == -1)
     102                 :            :                 return -EINVAL;
     103                 :            : 
     104         [ #  # ]:          0 :         if (virtio_gpu_modeset == 0)
     105                 :            :                 return -EINVAL;
     106                 :            : 
     107                 :          0 :         dev = drm_dev_alloc(&driver, &vdev->dev);
     108         [ #  # ]:          0 :         if (IS_ERR(dev))
     109                 :          0 :                 return PTR_ERR(dev);
     110                 :          0 :         vdev->priv = dev;
     111                 :            : 
     112         [ #  # ]:          0 :         if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
     113                 :          0 :                 ret = virtio_gpu_pci_quirk(dev, vdev);
     114         [ #  # ]:          0 :                 if (ret)
     115                 :          0 :                         goto err_free;
     116                 :            :         }
     117                 :            : 
     118                 :          0 :         ret = virtio_gpu_init(dev);
     119         [ #  # ]:          0 :         if (ret)
     120                 :          0 :                 goto err_free;
     121                 :            : 
     122                 :          0 :         ret = drm_dev_register(dev, 0);
     123         [ #  # ]:          0 :         if (ret)
     124                 :          0 :                 goto err_free;
     125                 :            : 
     126                 :          0 :         drm_fbdev_generic_setup(vdev->priv, 32);
     127                 :          0 :         return 0;
     128                 :            : 
     129                 :          0 : err_free:
     130                 :          0 :         drm_dev_put(dev);
     131                 :          0 :         return ret;
     132                 :            : }
     133                 :            : 
     134                 :          0 : static void virtio_gpu_remove(struct virtio_device *vdev)
     135                 :            : {
     136                 :          0 :         struct drm_device *dev = vdev->priv;
     137                 :            : 
     138                 :          0 :         drm_dev_unregister(dev);
     139                 :          0 :         virtio_gpu_deinit(dev);
     140                 :          0 :         drm_dev_put(dev);
     141                 :          0 : }
     142                 :            : 
     143                 :          0 : static void virtio_gpu_config_changed(struct virtio_device *vdev)
     144                 :            : {
     145                 :          0 :         struct drm_device *dev = vdev->priv;
     146                 :          0 :         struct virtio_gpu_device *vgdev = dev->dev_private;
     147                 :            : 
     148                 :          0 :         schedule_work(&vgdev->config_changed_work);
     149                 :          0 : }
     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                 :         21 : 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                 :            : };

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