1 /* $NetBSD: virtgpu_drv.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $ */ 2 3 /* 4 * Copyright (C) 2015 Red Hat, Inc. 5 * All Rights Reserved. 6 * 7 * Authors: 8 * Dave Airlie <airlied (at) redhat.com> 9 * Gerd Hoffmann <kraxel (at) redhat.com> 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a 12 * copy of this software and associated documentation files (the "Software"), 13 * to deal in the Software without restriction, including without limitation 14 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 15 * and/or sell copies of the Software, and to permit persons to whom the 16 * Software is furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice (including the next 19 * paragraph) shall be included in all copies or substantial portions of the 20 * Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 25 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 28 * OTHER DEALINGS IN THE SOFTWARE. 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: virtgpu_drv.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $"); 33 34 #include <linux/module.h> 35 #include <linux/console.h> 36 #include <linux/pci.h> 37 38 #include <drm/drm.h> 39 #include <drm/drm_drv.h> 40 #include <drm/drm_file.h> 41 42 #include "virtgpu_drv.h" 43 44 static struct drm_driver driver; 45 46 static int virtio_gpu_modeset = -1; 47 48 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 49 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 50 51 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev) 52 { 53 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent); 54 const char *pname = dev_name(&pdev->dev); 55 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 56 char unique[20]; 57 58 DRM_INFO("pci: %s detected at %s\n", 59 vga ? "virtio-vga" : "virtio-gpu-pci", 60 pname); 61 dev->pdev = pdev; 62 if (vga) 63 drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 64 "virtiodrmfb"); 65 66 /* 67 * Normally the drm_dev_set_unique() call is done by core DRM. 68 * The following comment covers, why virtio cannot rely on it. 69 * 70 * Unlike the other virtual GPU drivers, virtio abstracts the 71 * underlying bus type by using struct virtio_device. 72 * 73 * Hence the dev_is_pci() check, used in core DRM, will fail 74 * and the unique returned will be the virtio_device "virtio0", 75 * while a "pci:..." one is required. 76 * 77 * A few other ideas were considered: 78 * - Extend the dev_is_pci() check [in drm_set_busid] to 79 * consider virtio. 80 * Seems like a bigger hack than what we have already. 81 * 82 * - Point drm_device::dev to the parent of the virtio_device 83 * Semantic changes: 84 * * Using the wrong device for i2c, framebuffer_alloc and 85 * prime import. 86 * Visual changes: 87 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer, 88 * will print the wrong information. 89 * 90 * We could address the latter issues, by introducing 91 * drm_device::bus_dev, ... which would be used solely for this. 92 * 93 * So for the moment keep things as-is, with a bulky comment 94 * for the next person who feels like removing this 95 * drm_dev_set_unique() quirk. 96 */ 97 snprintf(unique, sizeof(unique), "pci:%s", pname); 98 return drm_dev_set_unique(dev, unique); 99 } 100 101 static int virtio_gpu_probe(struct virtio_device *vdev) 102 { 103 struct drm_device *dev; 104 int ret; 105 106 if (vgacon_text_force() && virtio_gpu_modeset == -1) 107 return -EINVAL; 108 109 if (virtio_gpu_modeset == 0) 110 return -EINVAL; 111 112 dev = drm_dev_alloc(&driver, &vdev->dev); 113 if (IS_ERR(dev)) 114 return PTR_ERR(dev); 115 vdev->priv = dev; 116 117 if (!strcmp(vdev->dev.parent->bus->name, "pci")) { 118 ret = virtio_gpu_pci_quirk(dev, vdev); 119 if (ret) 120 goto err_free; 121 } 122 123 ret = virtio_gpu_init(dev); 124 if (ret) 125 goto err_free; 126 127 ret = drm_dev_register(dev, 0); 128 if (ret) 129 goto err_free; 130 131 drm_fbdev_generic_setup(vdev->priv, 32); 132 return 0; 133 134 err_free: 135 drm_dev_put(dev); 136 return ret; 137 } 138 139 static void virtio_gpu_remove(struct virtio_device *vdev) 140 { 141 struct drm_device *dev = vdev->priv; 142 143 drm_dev_unregister(dev); 144 virtio_gpu_deinit(dev); 145 drm_dev_put(dev); 146 } 147 148 static void virtio_gpu_config_changed(struct virtio_device *vdev) 149 { 150 struct drm_device *dev = vdev->priv; 151 struct virtio_gpu_device *vgdev = dev->dev_private; 152 153 schedule_work(&vgdev->config_changed_work); 154 } 155 156 static struct virtio_device_id id_table[] = { 157 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 158 { 0 }, 159 }; 160 161 static unsigned int features[] = { 162 #ifdef __LITTLE_ENDIAN 163 /* 164 * Gallium command stream send by virgl is native endian. 165 * Because of that we only support little endian guests on 166 * little endian hosts. 167 */ 168 VIRTIO_GPU_F_VIRGL, 169 #endif 170 VIRTIO_GPU_F_EDID, 171 }; 172 static struct virtio_driver virtio_gpu_driver = { 173 .feature_table = features, 174 .feature_table_size = ARRAY_SIZE(features), 175 .driver.name = KBUILD_MODNAME, 176 .driver.owner = THIS_MODULE, 177 .id_table = id_table, 178 .probe = virtio_gpu_probe, 179 .remove = virtio_gpu_remove, 180 .config_changed = virtio_gpu_config_changed 181 }; 182 183 module_virtio_driver(virtio_gpu_driver); 184 185 MODULE_DEVICE_TABLE(virtio, id_table); 186 MODULE_DESCRIPTION("Virtio GPU driver"); 187 MODULE_LICENSE("GPL and additional rights"); 188 MODULE_AUTHOR("Dave Airlie <airlied (at) redhat.com>"); 189 MODULE_AUTHOR("Gerd Hoffmann <kraxel (at) redhat.com>"); 190 MODULE_AUTHOR("Alon Levy"); 191 192 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops); 193 194 static struct drm_driver driver = { 195 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC, 196 .open = virtio_gpu_driver_open, 197 .postclose = virtio_gpu_driver_postclose, 198 199 .dumb_create = virtio_gpu_mode_dumb_create, 200 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 201 202 #if defined(CONFIG_DEBUG_FS) 203 .debugfs_init = virtio_gpu_debugfs_init, 204 #endif 205 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 206 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 207 .gem_prime_mmap = drm_gem_prime_mmap, 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
Indexes created Sun Sep 21 16:09:51 GMT 2025