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/aperture.h> 30 #include <linux/module.h> 31 #include <linux/pci.h> 32 #include <linux/poll.h> 33 #include <linux/vgaarb.h> 34 #include <linux/wait.h> 35 36 #include <drm/clients/drm_client_setup.h> 37 #include <drm/drm.h> 38 #include <drm/drm_atomic_helper.h> 39 #include <drm/drm_drv.h> 40 #include <drm/drm_fbdev_shmem.h> 41 #include <drm/drm_file.h> 42 #include <drm/drm_print.h> 43 44 #include "virtgpu_drv.h" 45 46 #define PCI_DEVICE_ID_VIRTIO_GPU 0x1050 47 48 static const struct drm_driver driver; 49 50 static int virtio_gpu_modeset = -1; 51 52 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 53 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 54 55 static int virtio_gpu_pci_quirk(struct drm_device *dev) 56 { 57 struct pci_dev *pdev = to_pci_dev(dev->dev); 58 const char *pname = dev_name(&pdev->dev); 59 bool vga = pci_is_vga(pdev); 60 int ret; 61 62 DRM_INFO("pci: %s detected at %s\n", 63 vga ? "virtio-vga" : "virtio-gpu-pci", 64 pname); 65 if (vga) { 66 ret = aperture_remove_conflicting_pci_devices(pdev, driver.name); 67 if (ret) 68 return ret; 69 } 70 71 return 0; 72 } 73 74 static int virtio_gpu_probe(struct virtio_device *vdev) 75 { 76 struct drm_device *dev; 77 int ret; 78 79 if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1) 80 return -EINVAL; 81 82 if (virtio_gpu_modeset == 0) 83 return -EINVAL; 84 85 /* 86 * The virtio-gpu device is a virtual device that doesn't have DMA 87 * ops assigned to it, nor DMA mask set and etc. Its parent device 88 * is actual GPU device we want to use it for the DRM's device in 89 * order to benefit from using generic DRM APIs. 90 */ 91 dev = drm_dev_alloc(&driver, vdev->dev.parent); 92 if (IS_ERR(dev)) 93 return PTR_ERR(dev); 94 vdev->priv = dev; 95 96 if (dev_is_pci(vdev->dev.parent)) { 97 ret = virtio_gpu_pci_quirk(dev); 98 if (ret) 99 goto err_free; 100 } 101 102 dma_set_max_seg_size(dev->dev, dma_max_mapping_size(dev->dev) ?: UINT_MAX); 103 ret = virtio_gpu_init(vdev, dev); 104 if (ret) 105 goto err_free; 106 107 ret = drm_dev_register(dev, 0); 108 if (ret) 109 goto err_deinit; 110 111 drm_client_setup(vdev->priv, NULL); 112 113 return 0; 114 115 err_deinit: 116 virtio_gpu_deinit(dev); 117 err_free: 118 drm_dev_put(dev); 119 return ret; 120 } 121 122 /* 123 * Release pending virtqueue waits so the drm_dev_enter/exit() critical 124 * sections complete before drm_dev_unplug() blocks on synchronize_srcu(). 125 */ 126 static void virtio_gpu_release_vqs(struct drm_device *dev) 127 { 128 struct virtio_gpu_device *vgdev = dev->dev_private; 129 130 vgdev->vqs_released = true; 131 wake_up_all(&vgdev->ctrlq.ack_queue); 132 wake_up_all(&vgdev->cursorq.ack_queue); 133 } 134 135 static void virtio_gpu_remove(struct virtio_device *vdev) 136 { 137 struct drm_device *dev = vdev->priv; 138 139 virtio_gpu_release_vqs(dev); 140 drm_dev_unplug(dev); 141 142 if (drm_core_check_feature(dev, DRIVER_ATOMIC)) 143 drm_atomic_helper_shutdown(dev); 144 145 virtio_gpu_deinit(dev); 146 drm_dev_put(dev); 147 } 148 149 static void virtio_gpu_shutdown(struct virtio_device *vdev) 150 { 151 struct drm_device *dev = vdev->priv; 152 153 virtio_gpu_release_vqs(dev); 154 /* stop talking to the device */ 155 drm_dev_unplug(dev); 156 } 157 158 static void virtio_gpu_config_changed(struct virtio_device *vdev) 159 { 160 struct drm_device *dev = vdev->priv; 161 struct virtio_gpu_device *vgdev = dev->dev_private; 162 163 schedule_work(&vgdev->config_changed_work); 164 } 165 166 static struct virtio_device_id id_table[] = { 167 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 168 { 0 }, 169 }; 170 171 static unsigned int features[] = { 172 #ifdef __LITTLE_ENDIAN 173 /* 174 * Gallium command stream send by virgl is native endian. 175 * Because of that we only support little endian guests on 176 * little endian hosts. 177 */ 178 VIRTIO_GPU_F_VIRGL, 179 #endif 180 VIRTIO_GPU_F_EDID, 181 VIRTIO_GPU_F_RESOURCE_UUID, 182 VIRTIO_GPU_F_RESOURCE_BLOB, 183 VIRTIO_GPU_F_CONTEXT_INIT, 184 VIRTIO_GPU_F_BLOB_ALIGNMENT, 185 }; 186 187 #ifdef CONFIG_PM_SLEEP 188 static void virtgpu_hibernation_restore(struct virtio_gpu_device *vgdev) 189 { 190 if (vgdev->hibernated) { 191 vgdev->hibernated = false; 192 virtio_gpu_object_restore_all(vgdev); 193 } 194 } 195 196 static int virtgpu_freeze(struct virtio_device *vdev) 197 { 198 struct drm_device *dev = vdev->priv; 199 struct virtio_gpu_device *vgdev = dev->dev_private; 200 int error; 201 202 error = drm_mode_config_helper_suspend(dev); 203 if (error) { 204 DRM_ERROR("suspend error: %d\n", error); 205 return error; 206 } 207 208 if (vgdev->hibernated) 209 virtio_gpu_object_unref_all(vgdev); 210 211 flush_work(&vgdev->obj_free_work); 212 flush_work(&vgdev->ctrlq.dequeue_work); 213 flush_work(&vgdev->cursorq.dequeue_work); 214 flush_work(&vgdev->config_changed_work); 215 216 error = virtio_gpu_wait_queue(&vgdev->ctrlq, vgdev->ctrlq.vq->num_max); 217 if (error) { 218 DRM_ERROR("ctrlq wait failed: %d\n", error); 219 goto err_resume; 220 } 221 222 error = virtio_gpu_wait_queue(&vgdev->cursorq, vgdev->cursorq.vq->num_max); 223 if (error) { 224 DRM_ERROR("cursorq wait failed: %d\n", error); 225 goto err_resume; 226 } 227 228 virtio_reset_device(vdev); 229 vdev->config->del_vqs(vdev); 230 231 return 0; 232 233 err_resume: 234 virtgpu_hibernation_restore(vgdev); 235 236 drm_mode_config_helper_resume(dev); 237 238 return error; 239 } 240 241 static int virtgpu_restore(struct virtio_device *vdev) 242 { 243 struct drm_device *dev = vdev->priv; 244 struct virtio_gpu_device *vgdev = dev->dev_private; 245 int error; 246 247 error = virtio_gpu_find_vqs(vgdev); 248 if (error) { 249 DRM_ERROR("failed to find virt queues\n"); 250 return error; 251 } 252 253 virtio_device_ready(vdev); 254 255 virtgpu_hibernation_restore(vgdev); 256 257 error = drm_mode_config_helper_resume(dev); 258 if (error) { 259 DRM_ERROR("resume error: %d\n", error); 260 return error; 261 } 262 263 return 0; 264 } 265 #endif 266 267 static struct virtio_driver virtio_gpu_driver = { 268 .feature_table = features, 269 .feature_table_size = ARRAY_SIZE(features), 270 .driver.name = KBUILD_MODNAME, 271 .id_table = id_table, 272 .probe = virtio_gpu_probe, 273 .remove = virtio_gpu_remove, 274 .shutdown = virtio_gpu_shutdown, 275 .config_changed = virtio_gpu_config_changed, 276 #ifdef CONFIG_PM_SLEEP 277 .freeze = virtgpu_freeze, 278 .restore = virtgpu_restore, 279 #endif 280 }; 281 282 static int __init virtio_gpu_driver_init(void) 283 { 284 struct pci_dev *pdev; 285 int ret; 286 287 pdev = pci_get_device(PCI_VENDOR_ID_REDHAT_QUMRANET, 288 PCI_DEVICE_ID_VIRTIO_GPU, 289 NULL); 290 if (pdev && pci_is_vga(pdev)) { 291 ret = vga_get_interruptible(pdev, 292 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 293 if (ret) { 294 pci_dev_put(pdev); 295 return ret; 296 } 297 } 298 299 ret = register_virtio_driver(&virtio_gpu_driver); 300 301 if (pdev) { 302 if (pci_is_vga(pdev)) 303 vga_put(pdev, 304 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 305 306 pci_dev_put(pdev); 307 } 308 309 return ret; 310 } 311 312 static void __exit virtio_gpu_driver_exit(void) 313 { 314 unregister_virtio_driver(&virtio_gpu_driver); 315 } 316 317 module_init(virtio_gpu_driver_init); 318 module_exit(virtio_gpu_driver_exit); 319 320 MODULE_DEVICE_TABLE(virtio, id_table); 321 MODULE_DESCRIPTION("Virtio GPU driver"); 322 MODULE_LICENSE("GPL and additional rights"); 323 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 324 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 325 MODULE_AUTHOR("Alon Levy"); 326 327 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops); 328 329 static const struct drm_driver driver = { 330 /* 331 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked 332 * out via drm_device::driver_features: 333 */ 334 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC | 335 DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT, 336 .open = virtio_gpu_driver_open, 337 .postclose = virtio_gpu_driver_postclose, 338 339 .dumb_create = virtio_gpu_mode_dumb_create, 340 341 DRM_FBDEV_SHMEM_DRIVER_OPS, 342 343 #if defined(CONFIG_DEBUG_FS) 344 .debugfs_init = virtio_gpu_debugfs_init, 345 #endif 346 .gem_prime_import = virtgpu_gem_prime_import, 347 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 348 349 .gem_create_object = virtio_gpu_create_object, 350 .fops = &virtio_gpu_driver_fops, 351 352 .ioctls = virtio_gpu_ioctls, 353 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 354 355 .name = DRIVER_NAME, 356 .desc = DRIVER_DESC, 357 .major = DRIVER_MAJOR, 358 .minor = DRIVER_MINOR, 359 .patchlevel = DRIVER_PATCHLEVEL, 360 361 .release = virtio_gpu_release, 362 }; 363