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 static void virtio_gpu_remove(struct virtio_device *vdev) 123 { 124 struct drm_device *dev = vdev->priv; 125 126 drm_dev_unplug(dev); 127 drm_atomic_helper_shutdown(dev); 128 virtio_gpu_deinit(dev); 129 drm_dev_put(dev); 130 } 131 132 static void virtio_gpu_shutdown(struct virtio_device *vdev) 133 { 134 struct drm_device *dev = vdev->priv; 135 136 /* stop talking to the device */ 137 drm_dev_unplug(dev); 138 } 139 140 static void virtio_gpu_config_changed(struct virtio_device *vdev) 141 { 142 struct drm_device *dev = vdev->priv; 143 struct virtio_gpu_device *vgdev = dev->dev_private; 144 145 schedule_work(&vgdev->config_changed_work); 146 } 147 148 static struct virtio_device_id id_table[] = { 149 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 150 { 0 }, 151 }; 152 153 static unsigned int features[] = { 154 #ifdef __LITTLE_ENDIAN 155 /* 156 * Gallium command stream send by virgl is native endian. 157 * Because of that we only support little endian guests on 158 * little endian hosts. 159 */ 160 VIRTIO_GPU_F_VIRGL, 161 #endif 162 VIRTIO_GPU_F_EDID, 163 VIRTIO_GPU_F_RESOURCE_UUID, 164 VIRTIO_GPU_F_RESOURCE_BLOB, 165 VIRTIO_GPU_F_CONTEXT_INIT, 166 VIRTIO_GPU_F_BLOB_ALIGNMENT, 167 }; 168 169 #ifdef CONFIG_PM_SLEEP 170 static void virtgpu_hibernation_restore(struct virtio_gpu_device *vgdev) 171 { 172 if (vgdev->hibernated) { 173 vgdev->hibernated = false; 174 virtio_gpu_object_restore_all(vgdev); 175 } 176 } 177 178 static int virtgpu_freeze(struct virtio_device *vdev) 179 { 180 struct drm_device *dev = vdev->priv; 181 struct virtio_gpu_device *vgdev = dev->dev_private; 182 int error; 183 184 error = drm_mode_config_helper_suspend(dev); 185 if (error) { 186 DRM_ERROR("suspend error: %d\n", error); 187 return error; 188 } 189 190 if (vgdev->hibernated) 191 virtio_gpu_object_unref_all(vgdev); 192 193 flush_work(&vgdev->obj_free_work); 194 flush_work(&vgdev->ctrlq.dequeue_work); 195 flush_work(&vgdev->cursorq.dequeue_work); 196 flush_work(&vgdev->config_changed_work); 197 198 error = virtio_gpu_wait_queue(&vgdev->ctrlq, vgdev->ctrlq.vq->num_max); 199 if (error) { 200 DRM_ERROR("ctrlq wait failed: %d\n", error); 201 goto err_resume; 202 } 203 204 error = virtio_gpu_wait_queue(&vgdev->cursorq, vgdev->cursorq.vq->num_max); 205 if (error) { 206 DRM_ERROR("cursorq wait failed: %d\n", error); 207 goto err_resume; 208 } 209 210 vdev->config->del_vqs(vdev); 211 212 return 0; 213 214 err_resume: 215 virtgpu_hibernation_restore(vgdev); 216 217 drm_mode_config_helper_resume(dev); 218 219 return error; 220 } 221 222 static int virtgpu_restore(struct virtio_device *vdev) 223 { 224 struct drm_device *dev = vdev->priv; 225 struct virtio_gpu_device *vgdev = dev->dev_private; 226 int error; 227 228 error = virtio_gpu_find_vqs(vgdev); 229 if (error) { 230 DRM_ERROR("failed to find virt queues\n"); 231 return error; 232 } 233 234 virtio_device_ready(vdev); 235 236 virtgpu_hibernation_restore(vgdev); 237 238 error = drm_mode_config_helper_resume(dev); 239 if (error) { 240 DRM_ERROR("resume error: %d\n", error); 241 return error; 242 } 243 244 return 0; 245 } 246 #endif 247 248 static struct virtio_driver virtio_gpu_driver = { 249 .feature_table = features, 250 .feature_table_size = ARRAY_SIZE(features), 251 .driver.name = KBUILD_MODNAME, 252 .id_table = id_table, 253 .probe = virtio_gpu_probe, 254 .remove = virtio_gpu_remove, 255 .shutdown = virtio_gpu_shutdown, 256 .config_changed = virtio_gpu_config_changed, 257 #ifdef CONFIG_PM_SLEEP 258 .freeze = virtgpu_freeze, 259 .restore = virtgpu_restore, 260 #endif 261 }; 262 263 static int __init virtio_gpu_driver_init(void) 264 { 265 struct pci_dev *pdev; 266 int ret; 267 268 pdev = pci_get_device(PCI_VENDOR_ID_REDHAT_QUMRANET, 269 PCI_DEVICE_ID_VIRTIO_GPU, 270 NULL); 271 if (pdev && pci_is_vga(pdev)) { 272 ret = vga_get_interruptible(pdev, 273 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 274 if (ret) { 275 pci_dev_put(pdev); 276 return ret; 277 } 278 } 279 280 ret = register_virtio_driver(&virtio_gpu_driver); 281 282 if (pdev) { 283 if (pci_is_vga(pdev)) 284 vga_put(pdev, 285 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 286 287 pci_dev_put(pdev); 288 } 289 290 return ret; 291 } 292 293 static void __exit virtio_gpu_driver_exit(void) 294 { 295 unregister_virtio_driver(&virtio_gpu_driver); 296 } 297 298 module_init(virtio_gpu_driver_init); 299 module_exit(virtio_gpu_driver_exit); 300 301 MODULE_DEVICE_TABLE(virtio, id_table); 302 MODULE_DESCRIPTION("Virtio GPU driver"); 303 MODULE_LICENSE("GPL and additional rights"); 304 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 305 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 306 MODULE_AUTHOR("Alon Levy"); 307 308 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops); 309 310 static const struct drm_driver driver = { 311 /* 312 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked 313 * out via drm_device::driver_features: 314 */ 315 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC | 316 DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT, 317 .open = virtio_gpu_driver_open, 318 .postclose = virtio_gpu_driver_postclose, 319 320 .dumb_create = virtio_gpu_mode_dumb_create, 321 322 DRM_FBDEV_SHMEM_DRIVER_OPS, 323 324 #if defined(CONFIG_DEBUG_FS) 325 .debugfs_init = virtio_gpu_debugfs_init, 326 #endif 327 .gem_prime_import = virtgpu_gem_prime_import, 328 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 329 330 .gem_create_object = virtio_gpu_create_object, 331 .fops = &virtio_gpu_driver_fops, 332 333 .ioctls = virtio_gpu_ioctls, 334 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 335 336 .name = DRIVER_NAME, 337 .desc = DRIVER_DESC, 338 .major = DRIVER_MAJOR, 339 .minor = DRIVER_MINOR, 340 .patchlevel = DRIVER_PATCHLEVEL, 341 342 .release = virtio_gpu_release, 343 }; 344