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/wait.h> 34 35 #include <drm/drm.h> 36 #include <drm/drm_atomic_helper.h> 37 #include <drm/drm_client_setup.h> 38 #include <drm/drm_drv.h> 39 #include <drm/drm_fbdev_shmem.h> 40 #include <drm/drm_file.h> 41 42 #include "virtgpu_drv.h" 43 44 static const struct drm_driver driver; 45 46 static int virtio_gpu_modeset = -1; 47 48 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 49 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 50 51 static int virtio_gpu_pci_quirk(struct drm_device *dev) 52 { 53 struct pci_dev *pdev = to_pci_dev(dev->dev); 54 const char *pname = dev_name(&pdev->dev); 55 bool vga = pci_is_vga(pdev); 56 int ret; 57 58 DRM_INFO("pci: %s detected at %s\n", 59 vga ? "virtio-vga" : "virtio-gpu-pci", 60 pname); 61 if (vga) { 62 ret = aperture_remove_conflicting_pci_devices(pdev, driver.name); 63 if (ret) 64 return ret; 65 } 66 67 return 0; 68 } 69 70 static int virtio_gpu_probe(struct virtio_device *vdev) 71 { 72 struct drm_device *dev; 73 int ret; 74 75 if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1) 76 return -EINVAL; 77 78 if (virtio_gpu_modeset == 0) 79 return -EINVAL; 80 81 /* 82 * The virtio-gpu device is a virtual device that doesn't have DMA 83 * ops assigned to it, nor DMA mask set and etc. Its parent device 84 * is actual GPU device we want to use it for the DRM's device in 85 * order to benefit from using generic DRM APIs. 86 */ 87 dev = drm_dev_alloc(&driver, vdev->dev.parent); 88 if (IS_ERR(dev)) 89 return PTR_ERR(dev); 90 vdev->priv = dev; 91 92 if (dev_is_pci(vdev->dev.parent)) { 93 ret = virtio_gpu_pci_quirk(dev); 94 if (ret) 95 goto err_free; 96 } 97 98 dma_set_max_seg_size(dev->dev, dma_max_mapping_size(dev->dev) ?: UINT_MAX); 99 ret = virtio_gpu_init(vdev, dev); 100 if (ret) 101 goto err_free; 102 103 ret = drm_dev_register(dev, 0); 104 if (ret) 105 goto err_deinit; 106 107 drm_client_setup(vdev->priv, NULL); 108 109 return 0; 110 111 err_deinit: 112 virtio_gpu_deinit(dev); 113 err_free: 114 drm_dev_put(dev); 115 return ret; 116 } 117 118 static void virtio_gpu_remove(struct virtio_device *vdev) 119 { 120 struct drm_device *dev = vdev->priv; 121 122 drm_dev_unplug(dev); 123 drm_atomic_helper_shutdown(dev); 124 virtio_gpu_deinit(dev); 125 drm_dev_put(dev); 126 } 127 128 static void virtio_gpu_config_changed(struct virtio_device *vdev) 129 { 130 struct drm_device *dev = vdev->priv; 131 struct virtio_gpu_device *vgdev = dev->dev_private; 132 133 schedule_work(&vgdev->config_changed_work); 134 } 135 136 static struct virtio_device_id id_table[] = { 137 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 138 { 0 }, 139 }; 140 141 static unsigned int features[] = { 142 #ifdef __LITTLE_ENDIAN 143 /* 144 * Gallium command stream send by virgl is native endian. 145 * Because of that we only support little endian guests on 146 * little endian hosts. 147 */ 148 VIRTIO_GPU_F_VIRGL, 149 #endif 150 VIRTIO_GPU_F_EDID, 151 VIRTIO_GPU_F_RESOURCE_UUID, 152 VIRTIO_GPU_F_RESOURCE_BLOB, 153 VIRTIO_GPU_F_CONTEXT_INIT, 154 }; 155 static struct virtio_driver virtio_gpu_driver = { 156 .feature_table = features, 157 .feature_table_size = ARRAY_SIZE(features), 158 .driver.name = KBUILD_MODNAME, 159 .id_table = id_table, 160 .probe = virtio_gpu_probe, 161 .remove = virtio_gpu_remove, 162 .config_changed = virtio_gpu_config_changed 163 }; 164 165 module_virtio_driver(virtio_gpu_driver); 166 167 MODULE_DEVICE_TABLE(virtio, id_table); 168 MODULE_DESCRIPTION("Virtio GPU driver"); 169 MODULE_LICENSE("GPL and additional rights"); 170 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 171 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 172 MODULE_AUTHOR("Alon Levy"); 173 174 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops); 175 176 static const struct drm_driver driver = { 177 /* 178 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked 179 * out via drm_device::driver_features: 180 */ 181 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC | 182 DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT, 183 .open = virtio_gpu_driver_open, 184 .postclose = virtio_gpu_driver_postclose, 185 186 .dumb_create = virtio_gpu_mode_dumb_create, 187 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 188 189 DRM_FBDEV_SHMEM_DRIVER_OPS, 190 191 #if defined(CONFIG_DEBUG_FS) 192 .debugfs_init = virtio_gpu_debugfs_init, 193 #endif 194 .gem_prime_import = virtgpu_gem_prime_import, 195 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 196 197 .gem_create_object = virtio_gpu_create_object, 198 .fops = &virtio_gpu_driver_fops, 199 200 .ioctls = virtio_gpu_ioctls, 201 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 202 203 .name = DRIVER_NAME, 204 .desc = DRIVER_DESC, 205 .date = DRIVER_DATE, 206 .major = DRIVER_MAJOR, 207 .minor = DRIVER_MINOR, 208 .patchlevel = DRIVER_PATCHLEVEL, 209 210 .release = virtio_gpu_release, 211 }; 212