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_aperture.h> 35 #include <drm/drm_atomic_helper.h> 36 #include <drm/drm_drv.h> 37 #include <drm/drm_file.h> 38 39 #include "virtgpu_drv.h" 40 41 static const struct drm_driver driver; 42 43 static int virtio_gpu_modeset = -1; 44 45 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 46 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 47 48 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev) 49 { 50 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent); 51 const char *pname = dev_name(&pdev->dev); 52 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 53 char unique[20]; 54 int ret; 55 56 DRM_INFO("pci: %s detected at %s\n", 57 vga ? "virtio-vga" : "virtio-gpu-pci", 58 pname); 59 if (vga) { 60 ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver); 61 if (ret) 62 return ret; 63 } 64 65 /* 66 * Normally the drm_dev_set_unique() call is done by core DRM. 67 * The following comment covers, why virtio cannot rely on it. 68 * 69 * Unlike the other virtual GPU drivers, virtio abstracts the 70 * underlying bus type by using struct virtio_device. 71 * 72 * Hence the dev_is_pci() check, used in core DRM, will fail 73 * and the unique returned will be the virtio_device "virtio0", 74 * while a "pci:..." one is required. 75 * 76 * A few other ideas were considered: 77 * - Extend the dev_is_pci() check [in drm_set_busid] to 78 * consider virtio. 79 * Seems like a bigger hack than what we have already. 80 * 81 * - Point drm_device::dev to the parent of the virtio_device 82 * Semantic changes: 83 * * Using the wrong device for i2c, framebuffer_alloc and 84 * prime import. 85 * Visual changes: 86 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer, 87 * will print the wrong information. 88 * 89 * We could address the latter issues, by introducing 90 * drm_device::bus_dev, ... which would be used solely for this. 91 * 92 * So for the moment keep things as-is, with a bulky comment 93 * for the next person who feels like removing this 94 * drm_dev_set_unique() quirk. 95 */ 96 snprintf(unique, sizeof(unique), "pci:%s", pname); 97 return drm_dev_set_unique(dev, unique); 98 } 99 100 static int virtio_gpu_probe(struct virtio_device *vdev) 101 { 102 struct drm_device *dev; 103 int ret; 104 105 if (vgacon_text_force() && virtio_gpu_modeset == -1) 106 return -EINVAL; 107 108 if (virtio_gpu_modeset == 0) 109 return -EINVAL; 110 111 dev = drm_dev_alloc(&driver, &vdev->dev); 112 if (IS_ERR(dev)) 113 return PTR_ERR(dev); 114 vdev->priv = dev; 115 116 if (!strcmp(vdev->dev.parent->bus->name, "pci")) { 117 ret = virtio_gpu_pci_quirk(dev, vdev); 118 if (ret) 119 goto err_free; 120 } 121 122 ret = virtio_gpu_init(dev); 123 if (ret) 124 goto err_free; 125 126 ret = drm_dev_register(dev, 0); 127 if (ret) 128 goto err_deinit; 129 130 drm_fbdev_generic_setup(vdev->priv, 32); 131 return 0; 132 133 err_deinit: 134 virtio_gpu_deinit(dev); 135 err_free: 136 drm_dev_put(dev); 137 return ret; 138 } 139 140 static void virtio_gpu_remove(struct virtio_device *vdev) 141 { 142 struct drm_device *dev = vdev->priv; 143 144 drm_dev_unplug(dev); 145 drm_atomic_helper_shutdown(dev); 146 virtio_gpu_deinit(dev); 147 drm_dev_put(dev); 148 } 149 150 static void virtio_gpu_config_changed(struct virtio_device *vdev) 151 { 152 struct drm_device *dev = vdev->priv; 153 struct virtio_gpu_device *vgdev = dev->dev_private; 154 155 schedule_work(&vgdev->config_changed_work); 156 } 157 158 static struct virtio_device_id id_table[] = { 159 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 160 { 0 }, 161 }; 162 163 static unsigned int features[] = { 164 #ifdef __LITTLE_ENDIAN 165 /* 166 * Gallium command stream send by virgl is native endian. 167 * Because of that we only support little endian guests on 168 * little endian hosts. 169 */ 170 VIRTIO_GPU_F_VIRGL, 171 #endif 172 VIRTIO_GPU_F_EDID, 173 VIRTIO_GPU_F_RESOURCE_UUID, 174 VIRTIO_GPU_F_RESOURCE_BLOB, 175 }; 176 static struct virtio_driver virtio_gpu_driver = { 177 .feature_table = features, 178 .feature_table_size = ARRAY_SIZE(features), 179 .driver.name = KBUILD_MODNAME, 180 .driver.owner = THIS_MODULE, 181 .id_table = id_table, 182 .probe = virtio_gpu_probe, 183 .remove = virtio_gpu_remove, 184 .config_changed = virtio_gpu_config_changed 185 }; 186 187 module_virtio_driver(virtio_gpu_driver); 188 189 MODULE_DEVICE_TABLE(virtio, id_table); 190 MODULE_DESCRIPTION("Virtio GPU driver"); 191 MODULE_LICENSE("GPL and additional rights"); 192 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 193 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 194 MODULE_AUTHOR("Alon Levy"); 195 196 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops); 197 198 static const struct drm_driver driver = { 199 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC, 200 .open = virtio_gpu_driver_open, 201 .postclose = virtio_gpu_driver_postclose, 202 203 .dumb_create = virtio_gpu_mode_dumb_create, 204 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 205 206 #if defined(CONFIG_DEBUG_FS) 207 .debugfs_init = virtio_gpu_debugfs_init, 208 #endif 209 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 210 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 211 .gem_prime_mmap = drm_gem_prime_mmap, 212 .gem_prime_import = virtgpu_gem_prime_import, 213 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 214 215 .gem_create_object = virtio_gpu_create_object, 216 .fops = &virtio_gpu_driver_fops, 217 218 .ioctls = virtio_gpu_ioctls, 219 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 220 221 .name = DRIVER_NAME, 222 .desc = DRIVER_DESC, 223 .date = DRIVER_DATE, 224 .major = DRIVER_MAJOR, 225 .minor = DRIVER_MINOR, 226 .patchlevel = DRIVER_PATCHLEVEL, 227 228 .release = virtio_gpu_release, 229 }; 230