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/console.h> 31 #include <linux/pci.h> 32 33 #include <drm/drm.h> 34 #include <drm/drm_drv.h> 35 #include <drm/drm_file.h> 36 37 #include "virtgpu_drv.h" 38 39 static struct drm_driver driver; 40 41 static int virtio_gpu_modeset = -1; 42 43 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 44 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 45 46 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev) 47 { 48 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent); 49 const char *pname = dev_name(&pdev->dev); 50 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 51 char unique[20]; 52 53 DRM_INFO("pci: %s detected at %s\n", 54 vga ? "virtio-vga" : "virtio-gpu-pci", 55 pname); 56 dev->pdev = pdev; 57 if (vga) 58 drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 59 0, 60 "virtiodrmfb"); 61 62 /* 63 * Normally the drm_dev_set_unique() call is done by core DRM. 64 * The following comment covers, why virtio cannot rely on it. 65 * 66 * Unlike the other virtual GPU drivers, virtio abstracts the 67 * underlying bus type by using struct virtio_device. 68 * 69 * Hence the dev_is_pci() check, used in core DRM, will fail 70 * and the unique returned will be the virtio_device "virtio0", 71 * while a "pci:..." one is required. 72 * 73 * A few other ideas were considered: 74 * - Extend the dev_is_pci() check [in drm_set_busid] to 75 * consider virtio. 76 * Seems like a bigger hack than what we have already. 77 * 78 * - Point drm_device::dev to the parent of the virtio_device 79 * Semantic changes: 80 * * Using the wrong device for i2c, framebuffer_alloc and 81 * prime import. 82 * Visual changes: 83 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer, 84 * will print the wrong information. 85 * 86 * We could address the latter issues, by introducing 87 * drm_device::bus_dev, ... which would be used solely for this. 88 * 89 * So for the moment keep things as-is, with a bulky comment 90 * for the next person who feels like removing this 91 * drm_dev_set_unique() quirk. 92 */ 93 snprintf(unique, sizeof(unique), "pci:%s", pname); 94 return drm_dev_set_unique(dev, unique); 95 } 96 97 static int virtio_gpu_probe(struct virtio_device *vdev) 98 { 99 struct drm_device *dev; 100 int ret; 101 102 if (vgacon_text_force() && virtio_gpu_modeset == -1) 103 return -EINVAL; 104 105 if (virtio_gpu_modeset == 0) 106 return -EINVAL; 107 108 dev = drm_dev_alloc(&driver, &vdev->dev); 109 if (IS_ERR(dev)) 110 return PTR_ERR(dev); 111 vdev->priv = dev; 112 113 if (!strcmp(vdev->dev.parent->bus->name, "pci")) { 114 ret = virtio_gpu_pci_quirk(dev, vdev); 115 if (ret) 116 goto err_free; 117 } 118 119 ret = virtio_gpu_init(dev); 120 if (ret) 121 goto err_free; 122 123 ret = drm_dev_register(dev, 0); 124 if (ret) 125 goto err_free; 126 127 drm_fbdev_generic_setup(vdev->priv, 32); 128 return 0; 129 130 err_free: 131 drm_dev_put(dev); 132 return ret; 133 } 134 135 static void virtio_gpu_remove(struct virtio_device *vdev) 136 { 137 struct drm_device *dev = vdev->priv; 138 139 drm_dev_unregister(dev); 140 virtio_gpu_deinit(dev); 141 drm_put_dev(dev); 142 } 143 144 static void virtio_gpu_config_changed(struct virtio_device *vdev) 145 { 146 struct drm_device *dev = vdev->priv; 147 struct virtio_gpu_device *vgdev = dev->dev_private; 148 149 schedule_work(&vgdev->config_changed_work); 150 } 151 152 static struct virtio_device_id id_table[] = { 153 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 154 { 0 }, 155 }; 156 157 static unsigned int features[] = { 158 #ifdef __LITTLE_ENDIAN 159 /* 160 * Gallium command stream send by virgl is native endian. 161 * Because of that we only support little endian guests on 162 * little endian hosts. 163 */ 164 VIRTIO_GPU_F_VIRGL, 165 #endif 166 VIRTIO_GPU_F_EDID, 167 }; 168 static struct virtio_driver virtio_gpu_driver = { 169 .feature_table = features, 170 .feature_table_size = ARRAY_SIZE(features), 171 .driver.name = KBUILD_MODNAME, 172 .driver.owner = THIS_MODULE, 173 .id_table = id_table, 174 .probe = virtio_gpu_probe, 175 .remove = virtio_gpu_remove, 176 .config_changed = virtio_gpu_config_changed 177 }; 178 179 module_virtio_driver(virtio_gpu_driver); 180 181 MODULE_DEVICE_TABLE(virtio, id_table); 182 MODULE_DESCRIPTION("Virtio GPU driver"); 183 MODULE_LICENSE("GPL and additional rights"); 184 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 185 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 186 MODULE_AUTHOR("Alon Levy"); 187 188 static const struct file_operations virtio_gpu_driver_fops = { 189 .owner = THIS_MODULE, 190 .open = drm_open, 191 .mmap = virtio_gpu_mmap, 192 .poll = drm_poll, 193 .read = drm_read, 194 .unlocked_ioctl = drm_ioctl, 195 .release = drm_release, 196 .compat_ioctl = drm_compat_ioctl, 197 .llseek = noop_llseek, 198 }; 199 200 static struct drm_driver driver = { 201 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC, 202 .open = virtio_gpu_driver_open, 203 .postclose = virtio_gpu_driver_postclose, 204 205 .dumb_create = virtio_gpu_mode_dumb_create, 206 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 207 208 #if defined(CONFIG_DEBUG_FS) 209 .debugfs_init = virtio_gpu_debugfs_init, 210 #endif 211 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 212 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 213 .gem_prime_get_sg_table = virtgpu_gem_prime_get_sg_table, 214 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 215 .gem_prime_vmap = virtgpu_gem_prime_vmap, 216 .gem_prime_vunmap = virtgpu_gem_prime_vunmap, 217 .gem_prime_mmap = virtgpu_gem_prime_mmap, 218 219 .gem_free_object_unlocked = virtio_gpu_gem_free_object, 220 .gem_open_object = virtio_gpu_gem_object_open, 221 .gem_close_object = virtio_gpu_gem_object_close, 222 .fops = &virtio_gpu_driver_fops, 223 224 .ioctls = virtio_gpu_ioctls, 225 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 226 227 .name = DRIVER_NAME, 228 .desc = DRIVER_DESC, 229 .date = DRIVER_DATE, 230 .major = DRIVER_MAJOR, 231 .minor = DRIVER_MINOR, 232 .patchlevel = DRIVER_PATCHLEVEL, 233 }; 234