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/pci.h> 31 #include <linux/poll.h> 32 #include <linux/wait.h> 33 34 #include <drm/drm.h> 35 #include <drm/drm_aperture.h> 36 #include <drm/drm_atomic_helper.h> 37 #include <drm/drm_drv.h> 38 #include <drm/drm_fbdev_generic.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) 51 { 52 struct pci_dev *pdev = to_pci_dev(dev->dev); 53 const char *pname = dev_name(&pdev->dev); 54 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 55 int ret; 56 57 DRM_INFO("pci: %s detected at %s\n", 58 vga ? "virtio-vga" : "virtio-gpu-pci", 59 pname); 60 if (vga) { 61 ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver); 62 if (ret) 63 return ret; 64 } 65 66 return 0; 67 } 68 69 static int virtio_gpu_probe(struct virtio_device *vdev) 70 { 71 struct drm_device *dev; 72 int ret; 73 74 if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1) 75 return -EINVAL; 76 77 if (virtio_gpu_modeset == 0) 78 return -EINVAL; 79 80 /* 81 * The virtio-gpu device is a virtual device that doesn't have DMA 82 * ops assigned to it, nor DMA mask set and etc. Its parent device 83 * is actual GPU device we want to use it for the DRM's device in 84 * order to benefit from using generic DRM APIs. 85 */ 86 dev = drm_dev_alloc(&driver, vdev->dev.parent); 87 if (IS_ERR(dev)) 88 return PTR_ERR(dev); 89 vdev->priv = dev; 90 91 if (dev_is_pci(vdev->dev.parent)) { 92 ret = virtio_gpu_pci_quirk(dev); 93 if (ret) 94 goto err_free; 95 } 96 97 ret = virtio_gpu_init(vdev, dev); 98 if (ret) 99 goto err_free; 100 101 ret = drm_dev_register(dev, 0); 102 if (ret) 103 goto err_deinit; 104 105 drm_fbdev_generic_setup(vdev->priv, 32); 106 return 0; 107 108 err_deinit: 109 virtio_gpu_deinit(dev); 110 err_free: 111 drm_dev_put(dev); 112 return ret; 113 } 114 115 static void virtio_gpu_remove(struct virtio_device *vdev) 116 { 117 struct drm_device *dev = vdev->priv; 118 119 drm_dev_unplug(dev); 120 drm_atomic_helper_shutdown(dev); 121 virtio_gpu_deinit(dev); 122 drm_dev_put(dev); 123 } 124 125 static void virtio_gpu_config_changed(struct virtio_device *vdev) 126 { 127 struct drm_device *dev = vdev->priv; 128 struct virtio_gpu_device *vgdev = dev->dev_private; 129 130 schedule_work(&vgdev->config_changed_work); 131 } 132 133 static struct virtio_device_id id_table[] = { 134 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 135 { 0 }, 136 }; 137 138 static unsigned int features[] = { 139 #ifdef __LITTLE_ENDIAN 140 /* 141 * Gallium command stream send by virgl is native endian. 142 * Because of that we only support little endian guests on 143 * little endian hosts. 144 */ 145 VIRTIO_GPU_F_VIRGL, 146 #endif 147 VIRTIO_GPU_F_EDID, 148 VIRTIO_GPU_F_RESOURCE_UUID, 149 VIRTIO_GPU_F_RESOURCE_BLOB, 150 VIRTIO_GPU_F_CONTEXT_INIT, 151 }; 152 static struct virtio_driver virtio_gpu_driver = { 153 .feature_table = features, 154 .feature_table_size = ARRAY_SIZE(features), 155 .driver.name = KBUILD_MODNAME, 156 .driver.owner = THIS_MODULE, 157 .id_table = id_table, 158 .probe = virtio_gpu_probe, 159 .remove = virtio_gpu_remove, 160 .config_changed = virtio_gpu_config_changed 161 }; 162 163 module_virtio_driver(virtio_gpu_driver); 164 165 MODULE_DEVICE_TABLE(virtio, id_table); 166 MODULE_DESCRIPTION("Virtio GPU driver"); 167 MODULE_LICENSE("GPL and additional rights"); 168 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 169 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 170 MODULE_AUTHOR("Alon Levy"); 171 172 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops); 173 174 static const struct drm_driver driver = { 175 /* 176 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked 177 * out via drm_device::driver_features: 178 */ 179 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC, 180 .open = virtio_gpu_driver_open, 181 .postclose = virtio_gpu_driver_postclose, 182 183 .dumb_create = virtio_gpu_mode_dumb_create, 184 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 185 186 #if defined(CONFIG_DEBUG_FS) 187 .debugfs_init = virtio_gpu_debugfs_init, 188 #endif 189 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 190 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 191 .gem_prime_mmap = drm_gem_prime_mmap, 192 .gem_prime_import = virtgpu_gem_prime_import, 193 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 194 195 .gem_create_object = virtio_gpu_create_object, 196 .fops = &virtio_gpu_driver_fops, 197 198 .ioctls = virtio_gpu_ioctls, 199 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 200 201 .name = DRIVER_NAME, 202 .desc = DRIVER_DESC, 203 .date = DRIVER_DATE, 204 .major = DRIVER_MAJOR, 205 .minor = DRIVER_MINOR, 206 .patchlevel = DRIVER_PATCHLEVEL, 207 208 .release = virtio_gpu_release, 209 }; 210