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 43 #include "virtgpu_drv.h" 44 45 #define PCI_DEVICE_ID_VIRTIO_GPU 0x1050 46 47 static const struct drm_driver driver; 48 49 static int virtio_gpu_modeset = -1; 50 51 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 52 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 53 54 static int virtio_gpu_pci_quirk(struct drm_device *dev) 55 { 56 struct pci_dev *pdev = to_pci_dev(dev->dev); 57 const char *pname = dev_name(&pdev->dev); 58 bool vga = pci_is_vga(pdev); 59 int ret; 60 61 DRM_INFO("pci: %s detected at %s\n", 62 vga ? "virtio-vga" : "virtio-gpu-pci", 63 pname); 64 if (vga) { 65 ret = aperture_remove_conflicting_pci_devices(pdev, driver.name); 66 if (ret) 67 return ret; 68 } 69 70 return 0; 71 } 72 73 static int virtio_gpu_probe(struct virtio_device *vdev) 74 { 75 struct drm_device *dev; 76 int ret; 77 78 if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1) 79 return -EINVAL; 80 81 if (virtio_gpu_modeset == 0) 82 return -EINVAL; 83 84 /* 85 * The virtio-gpu device is a virtual device that doesn't have DMA 86 * ops assigned to it, nor DMA mask set and etc. Its parent device 87 * is actual GPU device we want to use it for the DRM's device in 88 * order to benefit from using generic DRM APIs. 89 */ 90 dev = drm_dev_alloc(&driver, vdev->dev.parent); 91 if (IS_ERR(dev)) 92 return PTR_ERR(dev); 93 vdev->priv = dev; 94 95 if (dev_is_pci(vdev->dev.parent)) { 96 ret = virtio_gpu_pci_quirk(dev); 97 if (ret) 98 goto err_free; 99 } 100 101 dma_set_max_seg_size(dev->dev, dma_max_mapping_size(dev->dev) ?: UINT_MAX); 102 ret = virtio_gpu_init(vdev, dev); 103 if (ret) 104 goto err_free; 105 106 ret = drm_dev_register(dev, 0); 107 if (ret) 108 goto err_deinit; 109 110 drm_client_setup(vdev->priv, NULL); 111 112 return 0; 113 114 err_deinit: 115 virtio_gpu_deinit(dev); 116 err_free: 117 drm_dev_put(dev); 118 return ret; 119 } 120 121 static void virtio_gpu_remove(struct virtio_device *vdev) 122 { 123 struct drm_device *dev = vdev->priv; 124 125 drm_dev_unplug(dev); 126 drm_atomic_helper_shutdown(dev); 127 virtio_gpu_deinit(dev); 128 drm_dev_put(dev); 129 } 130 131 static void virtio_gpu_config_changed(struct virtio_device *vdev) 132 { 133 struct drm_device *dev = vdev->priv; 134 struct virtio_gpu_device *vgdev = dev->dev_private; 135 136 schedule_work(&vgdev->config_changed_work); 137 } 138 139 static struct virtio_device_id id_table[] = { 140 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 141 { 0 }, 142 }; 143 144 static unsigned int features[] = { 145 #ifdef __LITTLE_ENDIAN 146 /* 147 * Gallium command stream send by virgl is native endian. 148 * Because of that we only support little endian guests on 149 * little endian hosts. 150 */ 151 VIRTIO_GPU_F_VIRGL, 152 #endif 153 VIRTIO_GPU_F_EDID, 154 VIRTIO_GPU_F_RESOURCE_UUID, 155 VIRTIO_GPU_F_RESOURCE_BLOB, 156 VIRTIO_GPU_F_CONTEXT_INIT, 157 }; 158 static struct virtio_driver virtio_gpu_driver = { 159 .feature_table = features, 160 .feature_table_size = ARRAY_SIZE(features), 161 .driver.name = KBUILD_MODNAME, 162 .id_table = id_table, 163 .probe = virtio_gpu_probe, 164 .remove = virtio_gpu_remove, 165 .config_changed = virtio_gpu_config_changed 166 }; 167 168 static int __init virtio_gpu_driver_init(void) 169 { 170 struct pci_dev *pdev; 171 int ret; 172 173 pdev = pci_get_device(PCI_VENDOR_ID_REDHAT_QUMRANET, 174 PCI_DEVICE_ID_VIRTIO_GPU, 175 NULL); 176 if (pdev && pci_is_vga(pdev)) { 177 ret = vga_get_interruptible(pdev, 178 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 179 if (ret) { 180 pci_dev_put(pdev); 181 return ret; 182 } 183 } 184 185 ret = register_virtio_driver(&virtio_gpu_driver); 186 187 if (pdev) { 188 if (pci_is_vga(pdev)) 189 vga_put(pdev, 190 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 191 192 pci_dev_put(pdev); 193 } 194 195 return ret; 196 } 197 198 static void __exit virtio_gpu_driver_exit(void) 199 { 200 unregister_virtio_driver(&virtio_gpu_driver); 201 } 202 203 module_init(virtio_gpu_driver_init); 204 module_exit(virtio_gpu_driver_exit); 205 206 MODULE_DEVICE_TABLE(virtio, id_table); 207 MODULE_DESCRIPTION("Virtio GPU driver"); 208 MODULE_LICENSE("GPL and additional rights"); 209 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 210 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 211 MODULE_AUTHOR("Alon Levy"); 212 213 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops); 214 215 static const struct drm_driver driver = { 216 /* 217 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked 218 * out via drm_device::driver_features: 219 */ 220 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC | 221 DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT, 222 .open = virtio_gpu_driver_open, 223 .postclose = virtio_gpu_driver_postclose, 224 225 .dumb_create = virtio_gpu_mode_dumb_create, 226 227 DRM_FBDEV_SHMEM_DRIVER_OPS, 228 229 #if defined(CONFIG_DEBUG_FS) 230 .debugfs_init = virtio_gpu_debugfs_init, 231 #endif 232 .gem_prime_import = virtgpu_gem_prime_import, 233 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 234 235 .gem_create_object = virtio_gpu_create_object, 236 .fops = &virtio_gpu_driver_fops, 237 238 .ioctls = virtio_gpu_ioctls, 239 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 240 241 .name = DRIVER_NAME, 242 .desc = DRIVER_DESC, 243 .major = DRIVER_MAJOR, 244 .minor = DRIVER_MINOR, 245 .patchlevel = DRIVER_PATCHLEVEL, 246 247 .release = virtio_gpu_release, 248 }; 249