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 }; 218