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 #include <linux/poll.h> 33 #include <linux/wait.h> 34 35 #include <drm/drm.h> 36 #include <drm/drm_aperture.h> 37 #include <drm/drm_atomic_helper.h> 38 #include <drm/drm_drv.h> 39 #include <drm/drm_file.h> 40 41 #include "virtgpu_drv.h" 42 43 static const struct drm_driver driver; 44 45 static int virtio_gpu_modeset = -1; 46 47 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 48 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 49 50 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev) 51 { 52 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent); 53 const char *pname = dev_name(&pdev->dev); 54 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 55 char unique[20]; 56 int ret; 57 58 DRM_INFO("pci: %s detected at %s\n", 59 vga ? "virtio-vga" : "virtio-gpu-pci", 60 pname); 61 if (vga) { 62 ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver); 63 if (ret) 64 return ret; 65 } 66 67 /* 68 * Normally the drm_dev_set_unique() call is done by core DRM. 69 * The following comment covers, why virtio cannot rely on it. 70 * 71 * Unlike the other virtual GPU drivers, virtio abstracts the 72 * underlying bus type by using struct virtio_device. 73 * 74 * Hence the dev_is_pci() check, used in core DRM, will fail 75 * and the unique returned will be the virtio_device "virtio0", 76 * while a "pci:..." one is required. 77 * 78 * A few other ideas were considered: 79 * - Extend the dev_is_pci() check [in drm_set_busid] to 80 * consider virtio. 81 * Seems like a bigger hack than what we have already. 82 * 83 * - Point drm_device::dev to the parent of the virtio_device 84 * Semantic changes: 85 * * Using the wrong device for i2c, framebuffer_alloc and 86 * prime import. 87 * Visual changes: 88 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer, 89 * will print the wrong information. 90 * 91 * We could address the latter issues, by introducing 92 * drm_device::bus_dev, ... which would be used solely for this. 93 * 94 * So for the moment keep things as-is, with a bulky comment 95 * for the next person who feels like removing this 96 * drm_dev_set_unique() quirk. 97 */ 98 snprintf(unique, sizeof(unique), "pci:%s", pname); 99 return drm_dev_set_unique(dev, unique); 100 } 101 102 static int virtio_gpu_probe(struct virtio_device *vdev) 103 { 104 struct drm_device *dev; 105 int ret; 106 107 if (vgacon_text_force() && virtio_gpu_modeset == -1) 108 return -EINVAL; 109 110 if (virtio_gpu_modeset == 0) 111 return -EINVAL; 112 113 dev = drm_dev_alloc(&driver, &vdev->dev); 114 if (IS_ERR(dev)) 115 return PTR_ERR(dev); 116 vdev->priv = dev; 117 118 if (!strcmp(vdev->dev.parent->bus->name, "pci")) { 119 ret = virtio_gpu_pci_quirk(dev, vdev); 120 if (ret) 121 goto err_free; 122 } 123 124 ret = virtio_gpu_init(dev); 125 if (ret) 126 goto err_free; 127 128 ret = drm_dev_register(dev, 0); 129 if (ret) 130 goto err_deinit; 131 132 drm_fbdev_generic_setup(vdev->priv, 32); 133 return 0; 134 135 err_deinit: 136 virtio_gpu_deinit(dev); 137 err_free: 138 drm_dev_put(dev); 139 return ret; 140 } 141 142 static void virtio_gpu_remove(struct virtio_device *vdev) 143 { 144 struct drm_device *dev = vdev->priv; 145 146 drm_dev_unplug(dev); 147 drm_atomic_helper_shutdown(dev); 148 virtio_gpu_deinit(dev); 149 drm_dev_put(dev); 150 } 151 152 static void virtio_gpu_config_changed(struct virtio_device *vdev) 153 { 154 struct drm_device *dev = vdev->priv; 155 struct virtio_gpu_device *vgdev = dev->dev_private; 156 157 schedule_work(&vgdev->config_changed_work); 158 } 159 160 static __poll_t virtio_gpu_poll(struct file *filp, 161 struct poll_table_struct *wait) 162 { 163 struct drm_file *drm_file = filp->private_data; 164 struct virtio_gpu_fpriv *vfpriv = drm_file->driver_priv; 165 struct drm_device *dev = drm_file->minor->dev; 166 struct drm_pending_event *e = NULL; 167 __poll_t mask = 0; 168 169 if (!vfpriv->ring_idx_mask) 170 return drm_poll(filp, wait); 171 172 poll_wait(filp, &drm_file->event_wait, wait); 173 174 if (!list_empty(&drm_file->event_list)) { 175 spin_lock_irq(&dev->event_lock); 176 e = list_first_entry(&drm_file->event_list, 177 struct drm_pending_event, link); 178 drm_file->event_space += e->event->length; 179 list_del(&e->link); 180 spin_unlock_irq(&dev->event_lock); 181 182 kfree(e); 183 mask |= EPOLLIN | EPOLLRDNORM; 184 } 185 186 return mask; 187 } 188 189 static struct virtio_device_id id_table[] = { 190 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 191 { 0 }, 192 }; 193 194 static unsigned int features[] = { 195 #ifdef __LITTLE_ENDIAN 196 /* 197 * Gallium command stream send by virgl is native endian. 198 * Because of that we only support little endian guests on 199 * little endian hosts. 200 */ 201 VIRTIO_GPU_F_VIRGL, 202 #endif 203 VIRTIO_GPU_F_EDID, 204 VIRTIO_GPU_F_RESOURCE_UUID, 205 VIRTIO_GPU_F_RESOURCE_BLOB, 206 VIRTIO_GPU_F_CONTEXT_INIT, 207 }; 208 static struct virtio_driver virtio_gpu_driver = { 209 .feature_table = features, 210 .feature_table_size = ARRAY_SIZE(features), 211 .driver.name = KBUILD_MODNAME, 212 .driver.owner = THIS_MODULE, 213 .id_table = id_table, 214 .probe = virtio_gpu_probe, 215 .remove = virtio_gpu_remove, 216 .config_changed = virtio_gpu_config_changed 217 }; 218 219 module_virtio_driver(virtio_gpu_driver); 220 221 MODULE_DEVICE_TABLE(virtio, id_table); 222 MODULE_DESCRIPTION("Virtio GPU driver"); 223 MODULE_LICENSE("GPL and additional rights"); 224 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 225 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 226 MODULE_AUTHOR("Alon Levy"); 227 228 static const struct file_operations virtio_gpu_driver_fops = { 229 .owner = THIS_MODULE, 230 .open = drm_open, 231 .release = drm_release, 232 .unlocked_ioctl = drm_ioctl, 233 .compat_ioctl = drm_compat_ioctl, 234 .poll = virtio_gpu_poll, 235 .read = drm_read, 236 .llseek = noop_llseek, 237 .mmap = drm_gem_mmap 238 }; 239 240 static const struct drm_driver driver = { 241 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC, 242 .open = virtio_gpu_driver_open, 243 .postclose = virtio_gpu_driver_postclose, 244 245 .dumb_create = virtio_gpu_mode_dumb_create, 246 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 247 248 #if defined(CONFIG_DEBUG_FS) 249 .debugfs_init = virtio_gpu_debugfs_init, 250 #endif 251 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 252 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 253 .gem_prime_mmap = drm_gem_prime_mmap, 254 .gem_prime_import = virtgpu_gem_prime_import, 255 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 256 257 .gem_create_object = virtio_gpu_create_object, 258 .fops = &virtio_gpu_driver_fops, 259 260 .ioctls = virtio_gpu_ioctls, 261 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 262 263 .name = DRIVER_NAME, 264 .desc = DRIVER_DESC, 265 .date = DRIVER_DATE, 266 .major = DRIVER_MAJOR, 267 .minor = DRIVER_MINOR, 268 .patchlevel = DRIVER_PATCHLEVEL, 269 270 .release = virtio_gpu_release, 271 }; 272