drivers/virt/vboxguest/vboxguest_linux.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * vboxguest linux pci driver, char-dev and input-device code,
   4  *
   5  * Copyright (C) 2006-2016 Oracle Corporation
   6  */
   7
   8 #include <linux/input.h>
   9 #include <linux/kernel.h>
  10 #include <linux/miscdevice.h>
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include <linux/poll.h>
  14 #include <linux/vbox_utils.h>
  15 #include "vboxguest_core.h"
  16
  17 /** The device name. */
  18 #define DEVICE_NAME             "vboxguest"
  19 /** The device name for the device node open to everyone. */
  20 #define DEVICE_NAME_USER        "vboxuser"
  21 /** VirtualBox PCI vendor ID. */
  22 #define VBOX_VENDORID           0x80ee
  23 /** VMMDev PCI card product ID. */
  24 #define VMMDEV_DEVICEID         0xcafe
  25
  26 /** Mutex protecting the global vbg_gdev pointer used by vbg_get/put_gdev. */
  27 static DEFINE_MUTEX(vbg_gdev_mutex);
  28 /** Global vbg_gdev pointer used by vbg_get/put_gdev. */
  29 static struct vbg_dev *vbg_gdev;
  30
  31 static int vbg_misc_device_open(struct inode *inode, struct file *filp)
  32 {
  33         struct vbg_session *session;
  34         struct vbg_dev *gdev;
  35
  36         /* misc_open sets filp->private_data to our misc device */
  37         gdev = container_of(filp->private_data, struct vbg_dev, misc_device);
  38
  39         session = vbg_core_open_session(gdev, false);
  40         if (IS_ERR(session))
  41                 return PTR_ERR(session);
  42
  43         filp->private_data = session;
  44         return 0;
  45 }
  46
  47 static int vbg_misc_device_user_open(struct inode *inode, struct file *filp)
  48 {
  49         struct vbg_session *session;
  50         struct vbg_dev *gdev;
  51
  52         /* misc_open sets filp->private_data to our misc device */
  53         gdev = container_of(filp->private_data, struct vbg_dev,
  54                             misc_device_user);
  55
  56         session = vbg_core_open_session(gdev, false);
  57         if (IS_ERR(session))
  58                 return PTR_ERR(session);
  59
  60         filp->private_data = session;
  61         return 0;
  62 }
  63
  64 /**
  65  * Close device.
  66  * Return: 0 on success, negated errno on failure.
  67  * @inode:              Pointer to inode info structure.
  68  * @filp:               Associated file pointer.
  69  */
  70 static int vbg_misc_device_close(struct inode *inode, struct file *filp)
  71 {
  72         vbg_core_close_session(filp->private_data);
  73         filp->private_data = NULL;
  74         return 0;
  75 }
  76
  77 /**
  78  * Device I/O Control entry point.
  79  * Return: 0 on success, negated errno on failure.
  80  * @filp:               Associated file pointer.
  81  * @req:                The request specified to ioctl().
  82  * @arg:                The argument specified to ioctl().
  83  */
  84 static long vbg_misc_device_ioctl(struct file *filp, unsigned int req,
  85                                   unsigned long arg)
  86 {
  87         struct vbg_session *session = filp->private_data;
  88         size_t returned_size, size;
  89         struct vbg_ioctl_hdr hdr;
  90         bool is_vmmdev_req;
  91         int ret = 0;
  92         void *buf;
  93
  94         if (copy_from_user(&hdr, (void *)arg, sizeof(hdr)))
  95                 return -EFAULT;
  96
  97         if (hdr.version != VBG_IOCTL_HDR_VERSION)
  98                 return -EINVAL;
  99
 100         if (hdr.size_in < sizeof(hdr) ||
 101             (hdr.size_out && hdr.size_out < sizeof(hdr)))
 102                 return -EINVAL;
 103
 104         size = max(hdr.size_in, hdr.size_out);
 105         if (_IOC_SIZE(req) && _IOC_SIZE(req) != size)
 106                 return -EINVAL;
 107         if (size > SZ_16M)
 108                 return -E2BIG;
 109
 110         /*
 111          * IOCTL_VMMDEV_REQUEST needs the buffer to be below 4G to avoid
 112          * the need for a bounce-buffer and another copy later on.
 113          */
 114         is_vmmdev_req = (req & ~IOCSIZE_MASK) == VBG_IOCTL_VMMDEV_REQUEST(0) ||
 115                          req == VBG_IOCTL_VMMDEV_REQUEST_BIG;
 116
 117         if (is_vmmdev_req)
 118                 buf = vbg_req_alloc(size, VBG_IOCTL_HDR_TYPE_DEFAULT);
 119         else
 120                 buf = kmalloc(size, GFP_KERNEL);
 121         if (!buf)
 122                 return -ENOMEM;
 123
 124         *((struct vbg_ioctl_hdr *)buf) = hdr;
 125         if (copy_from_user(buf + sizeof(hdr), (void *)arg + sizeof(hdr),
 126                            hdr.size_in - sizeof(hdr))) {
 127                 ret = -EFAULT;
 128                 goto out;
 129         }
 130         if (hdr.size_in < size)
 131                 memset(buf + hdr.size_in, 0, size -  hdr.size_in);
 132
 133         ret = vbg_core_ioctl(session, req, buf);
 134         if (ret)
 135                 goto out;
 136
 137         returned_size = ((struct vbg_ioctl_hdr *)buf)->size_out;
 138         if (returned_size > size) {
 139                 vbg_debug("%s: too much output data %zu > %zu\n",
 140                           __func__, returned_size, size);
 141                 returned_size = size;
 142         }
 143         if (copy_to_user((void *)arg, buf, returned_size) != 0)
 144                 ret = -EFAULT;
 145
 146 out:
 147         if (is_vmmdev_req)
 148                 vbg_req_free(buf, size);
 149         else
 150                 kfree(buf);
 151
 152         return ret;
 153 }
 154
 155 /** The file_operations structures. */
 156 static const struct file_operations vbg_misc_device_fops = {
 157         .owner                  = THIS_MODULE,
 158         .open                   = vbg_misc_device_open,
 159         .release                = vbg_misc_device_close,
 160         .unlocked_ioctl         = vbg_misc_device_ioctl,
 161 #ifdef CONFIG_COMPAT
 162         .compat_ioctl           = vbg_misc_device_ioctl,
 163 #endif
 164 };
 165 static const struct file_operations vbg_misc_device_user_fops = {
 166         .owner                  = THIS_MODULE,
 167         .open                   = vbg_misc_device_user_open,
 168         .release                = vbg_misc_device_close,
 169         .unlocked_ioctl         = vbg_misc_device_ioctl,
 170 #ifdef CONFIG_COMPAT
 171         .compat_ioctl           = vbg_misc_device_ioctl,
 172 #endif
 173 };
 174
 175 /**
 176  * Called when the input device is first opened.
 177  *
 178  * Sets up absolute mouse reporting.
 179  */
 180 static int vbg_input_open(struct input_dev *input)
 181 {
 182         struct vbg_dev *gdev = input_get_drvdata(input);
 183         u32 feat = VMMDEV_MOUSE_GUEST_CAN_ABSOLUTE | VMMDEV_MOUSE_NEW_PROTOCOL;
 184         int ret;
 185
 186         ret = vbg_core_set_mouse_status(gdev, feat);
 187         if (ret)
 188                 return ret;
 189
 190         return 0;
 191 }
 192
 193 /**
 194  * Called if all open handles to the input device are closed.
 195  *
 196  * Disables absolute reporting.
 197  */
 198 static void vbg_input_close(struct input_dev *input)
 199 {
 200         struct vbg_dev *gdev = input_get_drvdata(input);
 201
 202         vbg_core_set_mouse_status(gdev, 0);
 203 }
 204
 205 /**
 206  * Creates the kernel input device.
 207  *
 208  * Return: 0 on success, negated errno on failure.
 209  */
 210 static int vbg_create_input_device(struct vbg_dev *gdev)
 211 {
 212         struct input_dev *input;
 213
 214         input = devm_input_allocate_device(gdev->dev);
 215         if (!input)
 216                 return -ENOMEM;
 217
 218         input->id.bustype = BUS_PCI;
 219         input->id.vendor = VBOX_VENDORID;
 220         input->id.product = VMMDEV_DEVICEID;
 221         input->open = vbg_input_open;
 222         input->close = vbg_input_close;
 223         input->dev.parent = gdev->dev;
 224         input->name = "VirtualBox mouse integration";
 225
 226         input_set_abs_params(input, ABS_X, VMMDEV_MOUSE_RANGE_MIN,
 227                              VMMDEV_MOUSE_RANGE_MAX, 0, 0);
 228         input_set_abs_params(input, ABS_Y, VMMDEV_MOUSE_RANGE_MIN,
 229                              VMMDEV_MOUSE_RANGE_MAX, 0, 0);
 230         input_set_capability(input, EV_KEY, BTN_MOUSE);
 231         input_set_drvdata(input, gdev);
 232
 233         gdev->input = input;
 234
 235         return input_register_device(gdev->input);
 236 }
 237
 238 static ssize_t host_version_show(struct device *dev,
 239                                  struct device_attribute *attr, char *buf)
 240 {
 241         struct vbg_dev *gdev = dev_get_drvdata(dev);
 242
 243         return sprintf(buf, "%s\n", gdev->host_version);
 244 }
 245
 246 static ssize_t host_features_show(struct device *dev,
 247                                  struct device_attribute *attr, char *buf)
 248 {
 249         struct vbg_dev *gdev = dev_get_drvdata(dev);
 250
 251         return sprintf(buf, "%#x\n", gdev->host_features);
 252 }
 253
 254 static DEVICE_ATTR_RO(host_version);
 255 static DEVICE_ATTR_RO(host_features);
 256
 257 /**
 258  * Does the PCI detection and init of the device.
 259  *
 260  * Return: 0 on success, negated errno on failure.
 261  */
 262 static int vbg_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
 263 {
 264         struct device *dev = &pci->dev;
 265         resource_size_t io, io_len, mmio, mmio_len;
 266         struct vmmdev_memory *vmmdev;
 267         struct vbg_dev *gdev;
 268         int ret;
 269
 270         gdev = devm_kzalloc(dev, sizeof(*gdev), GFP_KERNEL);
 271         if (!gdev)
 272                 return -ENOMEM;
 273
 274         ret = pci_enable_device(pci);
 275         if (ret != 0) {
 276                 vbg_err("vboxguest: Error enabling device: %d\n", ret);
 277                 return ret;
 278         }
 279
 280         ret = -ENODEV;
 281
 282         io = pci_resource_start(pci, 0);
 283         io_len = pci_resource_len(pci, 0);
 284         if (!io || !io_len) {
 285                 vbg_err("vboxguest: Error IO-port resource (0) is missing\n");
 286                 goto err_disable_pcidev;
 287         }
 288         if (devm_request_region(dev, io, io_len, DEVICE_NAME) == NULL) {
 289                 vbg_err("vboxguest: Error could not claim IO resource\n");
 290                 ret = -EBUSY;
 291                 goto err_disable_pcidev;
 292         }
 293
 294         mmio = pci_resource_start(pci, 1);
 295         mmio_len = pci_resource_len(pci, 1);
 296         if (!mmio || !mmio_len) {
 297                 vbg_err("vboxguest: Error MMIO resource (1) is missing\n");
 298                 goto err_disable_pcidev;
 299         }
 300
 301         if (devm_request_mem_region(dev, mmio, mmio_len, DEVICE_NAME) == NULL) {
 302                 vbg_err("vboxguest: Error could not claim MMIO resource\n");
 303                 ret = -EBUSY;
 304                 goto err_disable_pcidev;
 305         }
 306
 307         vmmdev = devm_ioremap(dev, mmio, mmio_len);
 308         if (!vmmdev) {
 309                 vbg_err("vboxguest: Error ioremap failed; MMIO addr=%pap size=%pap\n",
 310                         &mmio, &mmio_len);
 311                 goto err_disable_pcidev;
 312         }
 313
 314         /* Validate MMIO region version and size. */
 315         if (vmmdev->version != VMMDEV_MEMORY_VERSION ||
 316             vmmdev->size < 32 || vmmdev->size > mmio_len) {
 317                 vbg_err("vboxguest: Bogus VMMDev memory; version=%08x (expected %08x) size=%d (expected <= %d)\n",
 318                         vmmdev->version, VMMDEV_MEMORY_VERSION,
 319                         vmmdev->size, (int)mmio_len);
 320                 goto err_disable_pcidev;
 321         }
 322
 323         gdev->io_port = io;
 324         gdev->mmio = vmmdev;
 325         gdev->dev = dev;
 326         gdev->misc_device.minor = MISC_DYNAMIC_MINOR;
 327         gdev->misc_device.name = DEVICE_NAME;
 328         gdev->misc_device.fops = &vbg_misc_device_fops;
 329         gdev->misc_device_user.minor = MISC_DYNAMIC_MINOR;
 330         gdev->misc_device_user.name = DEVICE_NAME_USER;
 331         gdev->misc_device_user.fops = &vbg_misc_device_user_fops;
 332
 333         ret = vbg_core_init(gdev, VMMDEV_EVENT_MOUSE_POSITION_CHANGED);
 334         if (ret)
 335                 goto err_disable_pcidev;
 336
 337         ret = vbg_create_input_device(gdev);
 338         if (ret) {
 339                 vbg_err("vboxguest: Error creating input device: %d\n", ret);
 340                 goto err_vbg_core_exit;
 341         }
 342
 343         ret = devm_request_irq(dev, pci->irq, vbg_core_isr, IRQF_SHARED,
 344                                DEVICE_NAME, gdev);
 345         if (ret) {
 346                 vbg_err("vboxguest: Error requesting irq: %d\n", ret);
 347                 goto err_vbg_core_exit;
 348         }
 349
 350         ret = misc_register(&gdev->misc_device);
 351         if (ret) {
 352                 vbg_err("vboxguest: Error misc_register %s failed: %d\n",
 353                         DEVICE_NAME, ret);
 354                 goto err_vbg_core_exit;
 355         }
 356
 357         ret = misc_register(&gdev->misc_device_user);
 358         if (ret) {
 359                 vbg_err("vboxguest: Error misc_register %s failed: %d\n",
 360                         DEVICE_NAME_USER, ret);
 361                 goto err_unregister_misc_device;
 362         }
 363
 364         mutex_lock(&vbg_gdev_mutex);
 365         if (!vbg_gdev)
 366                 vbg_gdev = gdev;
 367         else
 368                 ret = -EBUSY;
 369         mutex_unlock(&vbg_gdev_mutex);
 370
 371         if (ret) {
 372                 vbg_err("vboxguest: Error more then 1 vbox guest pci device\n");
 373                 goto err_unregister_misc_device_user;
 374         }
 375
 376         pci_set_drvdata(pci, gdev);
 377         device_create_file(dev, &dev_attr_host_version);
 378         device_create_file(dev, &dev_attr_host_features);
 379
 380         vbg_info("vboxguest: misc device minor %d, IRQ %d, I/O port %x, MMIO at %pap (size %pap)\n",
 381                  gdev->misc_device.minor, pci->irq, gdev->io_port,
 382                  &mmio, &mmio_len);
 383
 384         return 0;
 385
 386 err_unregister_misc_device_user:
 387         misc_deregister(&gdev->misc_device_user);
 388 err_unregister_misc_device:
 389         misc_deregister(&gdev->misc_device);
 390 err_vbg_core_exit:
 391         vbg_core_exit(gdev);
 392 err_disable_pcidev:
 393         pci_disable_device(pci);
 394
 395         return ret;
 396 }
 397
 398 static void vbg_pci_remove(struct pci_dev *pci)
 399 {
 400         struct vbg_dev *gdev = pci_get_drvdata(pci);
 401
 402         mutex_lock(&vbg_gdev_mutex);
 403         vbg_gdev = NULL;
 404         mutex_unlock(&vbg_gdev_mutex);
 405
 406         device_remove_file(gdev->dev, &dev_attr_host_features);
 407         device_remove_file(gdev->dev, &dev_attr_host_version);
 408         misc_deregister(&gdev->misc_device_user);
 409         misc_deregister(&gdev->misc_device);
 410         vbg_core_exit(gdev);
 411         pci_disable_device(pci);
 412 }
 413
 414 struct vbg_dev *vbg_get_gdev(void)
 415 {
 416         mutex_lock(&vbg_gdev_mutex);
 417
 418         /*
 419          * Note on success we keep the mutex locked until vbg_put_gdev(),
 420          * this stops vbg_pci_remove from removing the device from underneath
 421          * vboxsf. vboxsf will only hold a reference for a short while.
 422          */
 423         if (vbg_gdev)
 424                 return vbg_gdev;
 425
 426         mutex_unlock(&vbg_gdev_mutex);
 427         return ERR_PTR(-ENODEV);
 428 }
 429 EXPORT_SYMBOL(vbg_get_gdev);
 430
 431 void vbg_put_gdev(struct vbg_dev *gdev)
 432 {
 433         WARN_ON(gdev != vbg_gdev);
 434         mutex_unlock(&vbg_gdev_mutex);
 435 }
 436 EXPORT_SYMBOL(vbg_put_gdev);
 437
 438 /**
 439  * Callback for mouse events.
 440  *
 441  * This is called at the end of the ISR, after leaving the event spinlock, if
 442  * VMMDEV_EVENT_MOUSE_POSITION_CHANGED was raised by the host.
 443  *
 444  * @gdev:               The device extension.
 445  */
 446 void vbg_linux_mouse_event(struct vbg_dev *gdev)
 447 {
 448         int rc;
 449
 450         /* Report events to the kernel input device */
 451         gdev->mouse_status_req->mouse_features = 0;
 452         gdev->mouse_status_req->pointer_pos_x = 0;
 453         gdev->mouse_status_req->pointer_pos_y = 0;
 454         rc = vbg_req_perform(gdev, gdev->mouse_status_req);
 455         if (rc >= 0) {
 456                 input_report_abs(gdev->input, ABS_X,
 457                                  gdev->mouse_status_req->pointer_pos_x);
 458                 input_report_abs(gdev->input, ABS_Y,
 459                                  gdev->mouse_status_req->pointer_pos_y);
 460                 input_sync(gdev->input);
 461         }
 462 }
 463
 464 static const struct pci_device_id vbg_pci_ids[] = {
 465         { .vendor = VBOX_VENDORID, .device = VMMDEV_DEVICEID },
 466         {}
 467 };
 468 MODULE_DEVICE_TABLE(pci,  vbg_pci_ids);
 469
 470 static struct pci_driver vbg_pci_driver = {
 471         .name           = DEVICE_NAME,
 472         .id_table       = vbg_pci_ids,
 473         .probe          = vbg_pci_probe,
 474         .remove         = vbg_pci_remove,
 475 };
 476
 477 module_pci_driver(vbg_pci_driver);
 478
 479 MODULE_AUTHOR("Oracle Corporation");
 480 MODULE_DESCRIPTION("Oracle VM VirtualBox Guest Additions for Linux Module");
 481 MODULE_LICENSE("GPL");