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_shmem.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 = pci_is_vga(pdev); 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 dma_set_max_seg_size(dev->dev, dma_max_mapping_size(dev->dev) ?: UINT_MAX); 98 ret = virtio_gpu_init(vdev, dev); 99 if (ret) 100 goto err_free; 101 102 ret = drm_dev_register(dev, 0); 103 if (ret) 104 goto err_deinit; 105 106 drm_fbdev_shmem_setup(vdev->priv, 32); 107 return 0; 108 109 err_deinit: 110 virtio_gpu_deinit(dev); 111 err_free: 112 drm_dev_put(dev); 113 return ret; 114 } 115 116 static void virtio_gpu_remove(struct virtio_device *vdev) 117 { 118 struct drm_device *dev = vdev->priv; 119 120 drm_dev_unplug(dev); 121 drm_atomic_helper_shutdown(dev); 122 virtio_gpu_deinit(dev); 123 drm_dev_put(dev); 124 } 125 126 static void virtio_gpu_config_changed(struct virtio_device *vdev) 127 { 128 struct drm_device *dev = vdev->priv; 129 struct virtio_gpu_device *vgdev = dev->dev_private; 130 131 schedule_work(&vgdev->config_changed_work); 132 } 133 134 static struct virtio_device_id id_table[] = { 135 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 136 { 0 }, 137 }; 138 139 static unsigned int features[] = { 140 #ifdef __LITTLE_ENDIAN 141 /* 142 * Gallium command stream send by virgl is native endian. 143 * Because of that we only support little endian guests on 144 * little endian hosts. 145 */ 146 VIRTIO_GPU_F_VIRGL, 147 #endif 148 VIRTIO_GPU_F_EDID, 149 VIRTIO_GPU_F_RESOURCE_UUID, 150 VIRTIO_GPU_F_RESOURCE_BLOB, 151 VIRTIO_GPU_F_CONTEXT_INIT, 152 }; 153 static struct virtio_driver virtio_gpu_driver = { 154 .feature_table = features, 155 .feature_table_size = ARRAY_SIZE(features), 156 .driver.name = KBUILD_MODNAME, 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 DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT, 181 .open = virtio_gpu_driver_open, 182 .postclose = virtio_gpu_driver_postclose, 183 184 .dumb_create = virtio_gpu_mode_dumb_create, 185 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 186 187 #if defined(CONFIG_DEBUG_FS) 188 .debugfs_init = virtio_gpu_debugfs_init, 189 #endif 190 .gem_prime_import = virtgpu_gem_prime_import, 191 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 192 193 .gem_create_object = virtio_gpu_create_object, 194 .fops = &virtio_gpu_driver_fops, 195 196 .ioctls = virtio_gpu_ioctls, 197 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 198 199 .name = DRIVER_NAME, 200 .desc = DRIVER_DESC, 201 .date = DRIVER_DATE, 202 .major = DRIVER_MAJOR, 203 .minor = DRIVER_MINOR, 204 .patchlevel = DRIVER_PATCHLEVEL, 205 206 .release = virtio_gpu_release, 207 }; 208