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_file.h> 39 40 #include "virtgpu_drv.h" 41 42 static const struct drm_driver driver; 43 44 static int virtio_gpu_modeset = -1; 45 46 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 47 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 48 49 static int virtio_gpu_pci_quirk(struct drm_device *dev) 50 { 51 struct pci_dev *pdev = to_pci_dev(dev->dev); 52 const char *pname = dev_name(&pdev->dev); 53 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 54 int ret; 55 56 DRM_INFO("pci: %s detected at %s\n", 57 vga ? "virtio-vga" : "virtio-gpu-pci", 58 pname); 59 if (vga) { 60 ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver); 61 if (ret) 62 return ret; 63 } 64 65 return 0; 66 } 67 68 static int virtio_gpu_probe(struct virtio_device *vdev) 69 { 70 struct drm_device *dev; 71 int ret; 72 73 if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1) 74 return -EINVAL; 75 76 if (virtio_gpu_modeset == 0) 77 return -EINVAL; 78 79 /* 80 * The virtio-gpu device is a virtual device that doesn't have DMA 81 * ops assigned to it, nor DMA mask set and etc. Its parent device 82 * is actual GPU device we want to use it for the DRM's device in 83 * order to benefit from using generic DRM APIs. 84 */ 85 dev = drm_dev_alloc(&driver, vdev->dev.parent); 86 if (IS_ERR(dev)) 87 return PTR_ERR(dev); 88 vdev->priv = dev; 89 90 if (dev_is_pci(vdev->dev.parent)) { 91 ret = virtio_gpu_pci_quirk(dev); 92 if (ret) 93 goto err_free; 94 } 95 96 ret = virtio_gpu_init(vdev, dev); 97 if (ret) 98 goto err_free; 99 100 ret = drm_dev_register(dev, 0); 101 if (ret) 102 goto err_deinit; 103 104 drm_fbdev_generic_setup(vdev->priv, 32); 105 return 0; 106 107 err_deinit: 108 virtio_gpu_deinit(dev); 109 err_free: 110 drm_dev_put(dev); 111 return ret; 112 } 113 114 static void virtio_gpu_remove(struct virtio_device *vdev) 115 { 116 struct drm_device *dev = vdev->priv; 117 118 drm_dev_unplug(dev); 119 drm_atomic_helper_shutdown(dev); 120 virtio_gpu_deinit(dev); 121 drm_dev_put(dev); 122 } 123 124 static void virtio_gpu_config_changed(struct virtio_device *vdev) 125 { 126 struct drm_device *dev = vdev->priv; 127 struct virtio_gpu_device *vgdev = dev->dev_private; 128 129 schedule_work(&vgdev->config_changed_work); 130 } 131 132 static struct virtio_device_id id_table[] = { 133 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 134 { 0 }, 135 }; 136 137 static unsigned int features[] = { 138 #ifdef __LITTLE_ENDIAN 139 /* 140 * Gallium command stream send by virgl is native endian. 141 * Because of that we only support little endian guests on 142 * little endian hosts. 143 */ 144 VIRTIO_GPU_F_VIRGL, 145 #endif 146 VIRTIO_GPU_F_EDID, 147 VIRTIO_GPU_F_RESOURCE_UUID, 148 VIRTIO_GPU_F_RESOURCE_BLOB, 149 VIRTIO_GPU_F_CONTEXT_INIT, 150 }; 151 static struct virtio_driver virtio_gpu_driver = { 152 .feature_table = features, 153 .feature_table_size = ARRAY_SIZE(features), 154 .driver.name = KBUILD_MODNAME, 155 .driver.owner = THIS_MODULE, 156 .id_table = id_table, 157 .probe = virtio_gpu_probe, 158 .remove = virtio_gpu_remove, 159 .config_changed = virtio_gpu_config_changed 160 }; 161 162 module_virtio_driver(virtio_gpu_driver); 163 164 MODULE_DEVICE_TABLE(virtio, id_table); 165 MODULE_DESCRIPTION("Virtio GPU driver"); 166 MODULE_LICENSE("GPL and additional rights"); 167 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 168 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 169 MODULE_AUTHOR("Alon Levy"); 170 171 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops); 172 173 static const struct drm_driver driver = { 174 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC, 175 .open = virtio_gpu_driver_open, 176 .postclose = virtio_gpu_driver_postclose, 177 178 .dumb_create = virtio_gpu_mode_dumb_create, 179 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 180 181 #if defined(CONFIG_DEBUG_FS) 182 .debugfs_init = virtio_gpu_debugfs_init, 183 #endif 184 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 185 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 186 .gem_prime_mmap = drm_gem_prime_mmap, 187 .gem_prime_import = virtgpu_gem_prime_import, 188 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 189 190 .gem_create_object = virtio_gpu_create_object, 191 .fops = &virtio_gpu_driver_fops, 192 193 .ioctls = virtio_gpu_ioctls, 194 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 195 196 .name = DRIVER_NAME, 197 .desc = DRIVER_DESC, 198 .date = DRIVER_DATE, 199 .major = DRIVER_MAJOR, 200 .minor = DRIVER_MINOR, 201 .patchlevel = DRIVER_PATCHLEVEL, 202 203 .release = virtio_gpu_release, 204 }; 205