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 #include <drm/drmP.h> 33 #include <drm/drm.h> 34 35 #include "virtgpu_drv.h" 36 static struct drm_driver driver; 37 38 static int virtio_gpu_modeset = -1; 39 40 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 41 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 42 43 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev) 44 { 45 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent); 46 const char *pname = dev_name(&pdev->dev); 47 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 48 char unique[20]; 49 50 DRM_INFO("pci: %s detected at %s\n", 51 vga ? "virtio-vga" : "virtio-gpu-pci", 52 pname); 53 dev->pdev = pdev; 54 if (vga) 55 drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 56 0, 57 "virtiodrmfb"); 58 59 /* 60 * Normally the drm_dev_set_unique() call is done by core DRM. 61 * The following comment covers, why virtio cannot rely on it. 62 * 63 * Unlike the other virtual GPU drivers, virtio abstracts the 64 * underlying bus type by using struct virtio_device. 65 * 66 * Hence the dev_is_pci() check, used in core DRM, will fail 67 * and the unique returned will be the virtio_device "virtio0", 68 * while a "pci:..." one is required. 69 * 70 * A few other ideas were considered: 71 * - Extend the dev_is_pci() check [in drm_set_busid] to 72 * consider virtio. 73 * Seems like a bigger hack than what we have already. 74 * 75 * - Point drm_device::dev to the parent of the virtio_device 76 * Semantic changes: 77 * * Using the wrong device for i2c, framebuffer_alloc and 78 * prime import. 79 * Visual changes: 80 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer, 81 * will print the wrong information. 82 * 83 * We could address the latter issues, by introducing 84 * drm_device::bus_dev, ... which would be used solely for this. 85 * 86 * So for the moment keep things as-is, with a bulky comment 87 * for the next person who feels like removing this 88 * drm_dev_set_unique() quirk. 89 */ 90 snprintf(unique, sizeof(unique), "pci:%s", pname); 91 return drm_dev_set_unique(dev, unique); 92 } 93 94 static int virtio_gpu_probe(struct virtio_device *vdev) 95 { 96 struct drm_device *dev; 97 int ret; 98 99 if (vgacon_text_force() && virtio_gpu_modeset == -1) 100 return -EINVAL; 101 102 if (virtio_gpu_modeset == 0) 103 return -EINVAL; 104 105 dev = drm_dev_alloc(&driver, &vdev->dev); 106 if (IS_ERR(dev)) 107 return PTR_ERR(dev); 108 vdev->priv = dev; 109 110 if (!strcmp(vdev->dev.parent->bus->name, "pci")) { 111 ret = virtio_gpu_pci_quirk(dev, vdev); 112 if (ret) 113 goto err_free; 114 } 115 116 ret = virtio_gpu_init(dev); 117 if (ret) 118 goto err_free; 119 120 ret = drm_dev_register(dev, 0); 121 if (ret) 122 goto err_free; 123 124 drm_fbdev_generic_setup(vdev->priv, 32); 125 return 0; 126 127 err_free: 128 drm_dev_put(dev); 129 return ret; 130 } 131 132 static void virtio_gpu_remove(struct virtio_device *vdev) 133 { 134 struct drm_device *dev = vdev->priv; 135 136 drm_dev_unregister(dev); 137 virtio_gpu_deinit(dev); 138 drm_put_dev(dev); 139 } 140 141 static void virtio_gpu_config_changed(struct virtio_device *vdev) 142 { 143 struct drm_device *dev = vdev->priv; 144 struct virtio_gpu_device *vgdev = dev->dev_private; 145 146 schedule_work(&vgdev->config_changed_work); 147 } 148 149 static struct virtio_device_id id_table[] = { 150 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 151 { 0 }, 152 }; 153 154 static unsigned int features[] = { 155 #ifdef __LITTLE_ENDIAN 156 /* 157 * Gallium command stream send by virgl is native endian. 158 * Because of that we only support little endian guests on 159 * little endian hosts. 160 */ 161 VIRTIO_GPU_F_VIRGL, 162 #endif 163 VIRTIO_GPU_F_EDID, 164 }; 165 static struct virtio_driver virtio_gpu_driver = { 166 .feature_table = features, 167 .feature_table_size = ARRAY_SIZE(features), 168 .driver.name = KBUILD_MODNAME, 169 .driver.owner = THIS_MODULE, 170 .id_table = id_table, 171 .probe = virtio_gpu_probe, 172 .remove = virtio_gpu_remove, 173 .config_changed = virtio_gpu_config_changed 174 }; 175 176 module_virtio_driver(virtio_gpu_driver); 177 178 MODULE_DEVICE_TABLE(virtio, id_table); 179 MODULE_DESCRIPTION("Virtio GPU driver"); 180 MODULE_LICENSE("GPL and additional rights"); 181 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 182 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 183 MODULE_AUTHOR("Alon Levy"); 184 185 static const struct file_operations virtio_gpu_driver_fops = { 186 .owner = THIS_MODULE, 187 .open = drm_open, 188 .mmap = virtio_gpu_mmap, 189 .poll = drm_poll, 190 .read = drm_read, 191 .unlocked_ioctl = drm_ioctl, 192 .release = drm_release, 193 .compat_ioctl = drm_compat_ioctl, 194 .llseek = noop_llseek, 195 }; 196 197 static struct drm_driver driver = { 198 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_RENDER | DRIVER_ATOMIC, 199 .open = virtio_gpu_driver_open, 200 .postclose = virtio_gpu_driver_postclose, 201 202 .dumb_create = virtio_gpu_mode_dumb_create, 203 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 204 205 #if defined(CONFIG_DEBUG_FS) 206 .debugfs_init = virtio_gpu_debugfs_init, 207 #endif 208 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 209 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 210 .gem_prime_export = drm_gem_prime_export, 211 .gem_prime_import = drm_gem_prime_import, 212 .gem_prime_pin = virtgpu_gem_prime_pin, 213 .gem_prime_unpin = virtgpu_gem_prime_unpin, 214 .gem_prime_get_sg_table = virtgpu_gem_prime_get_sg_table, 215 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 216 .gem_prime_vmap = virtgpu_gem_prime_vmap, 217 .gem_prime_vunmap = virtgpu_gem_prime_vunmap, 218 .gem_prime_mmap = virtgpu_gem_prime_mmap, 219 220 .gem_free_object_unlocked = virtio_gpu_gem_free_object, 221 .gem_open_object = virtio_gpu_gem_object_open, 222 .gem_close_object = virtio_gpu_gem_object_close, 223 .fops = &virtio_gpu_driver_fops, 224 225 .ioctls = virtio_gpu_ioctls, 226 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 227 228 .name = DRIVER_NAME, 229 .desc = DRIVER_DESC, 230 .date = DRIVER_DATE, 231 .major = DRIVER_MAJOR, 232 .minor = DRIVER_MINOR, 233 .patchlevel = DRIVER_PATCHLEVEL, 234 }; 235