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         if (copy_from_user(buf, (void *)arg, hdr.size_in)) {
 125                 ret = -EFAULT;
 126                 goto out;
 127         }
 128         if (hdr.size_in < size)
 129                 memset(buf + hdr.size_in, 0, size -  hdr.size_in);
 130
 131         ret = vbg_core_ioctl(session, req, buf);
 132         if (ret)
 133                 goto out;
 134
 135         returned_size = ((struct vbg_ioctl_hdr *)buf)->size_out;
 136         if (returned_size > size) {
 137                 vbg_debug("%s: too much output data %zu > %zu\n",
 138                           __func__, returned_size, size);
 139                 returned_size = size;
 140         }
 141         if (copy_to_user((void *)arg, buf, returned_size) != 0)
 142                 ret = -EFAULT;
 143
 144 out:
 145         if (is_vmmdev_req)
 146                 vbg_req_free(buf, size);
 147         else
 148                 kfree(buf);
 149
 150         return ret;
 151 }
 152
 153 /** The file_operations structures. */
 154 static const struct file_operations vbg_misc_device_fops = {
 155         .owner                  = THIS_MODULE,
 156         .open                   = vbg_misc_device_open,
 157         .release                = vbg_misc_device_close,
 158         .unlocked_ioctl         = vbg_misc_device_ioctl,
 159 #ifdef CONFIG_COMPAT
 160         .compat_ioctl           = vbg_misc_device_ioctl,
 161 #endif
 162 };
 163 static const struct file_operations vbg_misc_device_user_fops = {
 164         .owner                  = THIS_MODULE,
 165         .open                   = vbg_misc_device_user_open,
 166         .release                = vbg_misc_device_close,
 167         .unlocked_ioctl         = vbg_misc_device_ioctl,
 168 #ifdef CONFIG_COMPAT
 169         .compat_ioctl           = vbg_misc_device_ioctl,
 170 #endif
 171 };
 172
 173 /**
 174  * Called when the input device is first opened.
 175  *
 176  * Sets up absolute mouse reporting.
 177  */
 178 static int vbg_input_open(struct input_dev *input)
 179 {
 180         struct vbg_dev *gdev = input_get_drvdata(input);
 181         u32 feat = VMMDEV_MOUSE_GUEST_CAN_ABSOLUTE | VMMDEV_MOUSE_NEW_PROTOCOL;
 182         int ret;
 183
 184         ret = vbg_core_set_mouse_status(gdev, feat);
 185         if (ret)
 186                 return ret;
 187
 188         return 0;
 189 }
 190
 191 /**
 192  * Called if all open handles to the input device are closed.
 193  *
 194  * Disables absolute reporting.
 195  */
 196 static void vbg_input_close(struct input_dev *input)
 197 {
 198         struct vbg_dev *gdev = input_get_drvdata(input);
 199
 200         vbg_core_set_mouse_status(gdev, 0);
 201 }
 202
 203 /**
 204  * Creates the kernel input device.
 205  *
 206  * Return: 0 on success, negated errno on failure.
 207  */
 208 static int vbg_create_input_device(struct vbg_dev *gdev)
 209 {
 210         struct input_dev *input;
 211
 212         input = devm_input_allocate_device(gdev->dev);
 213         if (!input)
 214                 return -ENOMEM;
 215
 216         input->id.bustype = BUS_PCI;
 217         input->id.vendor = VBOX_VENDORID;
 218         input->id.product = VMMDEV_DEVICEID;
 219         input->open = vbg_input_open;
 220         input->close = vbg_input_close;
 221         input->dev.parent = gdev->dev;
 222         input->name = "VirtualBox mouse integration";
 223
 224         input_set_abs_params(input, ABS_X, VMMDEV_MOUSE_RANGE_MIN,
 225                              VMMDEV_MOUSE_RANGE_MAX, 0, 0);
 226         input_set_abs_params(input, ABS_Y, VMMDEV_MOUSE_RANGE_MIN,
 227                              VMMDEV_MOUSE_RANGE_MAX, 0, 0);
 228         input_set_capability(input, EV_KEY, BTN_MOUSE);
 229         input_set_drvdata(input, gdev);
 230
 231         gdev->input = input;
 232
 233         return input_register_device(gdev->input);
 234 }
 235
 236 static ssize_t host_version_show(struct device *dev,
 237                                  struct device_attribute *attr, char *buf)
 238 {
 239         struct vbg_dev *gdev = dev_get_drvdata(dev);
 240
 241         return sprintf(buf, "%s\n", gdev->host_version);
 242 }
 243
 244 static ssize_t host_features_show(struct device *dev,
 245                                  struct device_attribute *attr, char *buf)
 246 {
 247         struct vbg_dev *gdev = dev_get_drvdata(dev);
 248
 249         return sprintf(buf, "%#x\n", gdev->host_features);
 250 }
 251
 252 static DEVICE_ATTR_RO(host_version);
 253 static DEVICE_ATTR_RO(host_features);
 254
 255 /**
 256  * Does the PCI detection and init of the device.
 257  *
 258  * Return: 0 on success, negated errno on failure.
 259  */
 260 static int vbg_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
 261 {
 262         struct device *dev = &pci->dev;
 263         resource_size_t io, io_len, mmio, mmio_len;
 264         struct vmmdev_memory *vmmdev;
 265         struct vbg_dev *gdev;
 266         int ret;
 267
 268         gdev = devm_kzalloc(dev, sizeof(*gdev), GFP_KERNEL);
 269         if (!gdev)
 270                 return -ENOMEM;
 271
 272         ret = pci_enable_device(pci);
 273         if (ret != 0) {
 274                 vbg_err("vboxguest: Error enabling device: %d\n", ret);
 275                 return ret;
 276         }
 277
 278         ret = -ENODEV;
 279
 280         io = pci_resource_start(pci, 0);
 281         io_len = pci_resource_len(pci, 0);
 282         if (!io || !io_len) {
 283                 vbg_err("vboxguest: Error IO-port resource (0) is missing\n");
 284                 goto err_disable_pcidev;
 285         }
 286         if (devm_request_region(dev, io, io_len, DEVICE_NAME) == NULL) {
 287                 vbg_err("vboxguest: Error could not claim IO resource\n");
 288                 ret = -EBUSY;
 289                 goto err_disable_pcidev;
 290         }
 291
 292         mmio = pci_resource_start(pci, 1);
 293         mmio_len = pci_resource_len(pci, 1);
 294         if (!mmio || !mmio_len) {
 295                 vbg_err("vboxguest: Error MMIO resource (1) is missing\n");
 296                 goto err_disable_pcidev;
 297         }
 298
 299         if (devm_request_mem_region(dev, mmio, mmio_len, DEVICE_NAME) == NULL) {
 300                 vbg_err("vboxguest: Error could not claim MMIO resource\n");
 301                 ret = -EBUSY;
 302                 goto err_disable_pcidev;
 303         }
 304
 305         vmmdev = devm_ioremap(dev, mmio, mmio_len);
 306         if (!vmmdev) {
 307                 vbg_err("vboxguest: Error ioremap failed; MMIO addr=%pap size=%pap\n",
 308                         &mmio, &mmio_len);
 309                 goto err_disable_pcidev;
 310         }
 311
 312         /* Validate MMIO region version and size. */
 313         if (vmmdev->version != VMMDEV_MEMORY_VERSION ||
 314             vmmdev->size < 32 || vmmdev->size > mmio_len) {
 315                 vbg_err("vboxguest: Bogus VMMDev memory; version=%08x (expected %08x) size=%d (expected <= %d)\n",
 316                         vmmdev->version, VMMDEV_MEMORY_VERSION,
 317                         vmmdev->size, (int)mmio_len);
 318                 goto err_disable_pcidev;
 319         }
 320
 321         gdev->io_port = io;
 322         gdev->mmio = vmmdev;
 323         gdev->dev = dev;
 324         gdev->misc_device.minor = MISC_DYNAMIC_MINOR;
 325         gdev->misc_device.name = DEVICE_NAME;
 326         gdev->misc_device.fops = &vbg_misc_device_fops;
 327         gdev->misc_device_user.minor = MISC_DYNAMIC_MINOR;
 328         gdev->misc_device_user.name = DEVICE_NAME_USER;
 329         gdev->misc_device_user.fops = &vbg_misc_device_user_fops;
 330
 331         ret = vbg_core_init(gdev, VMMDEV_EVENT_MOUSE_POSITION_CHANGED);
 332         if (ret)
 333                 goto err_disable_pcidev;
 334
 335         ret = vbg_create_input_device(gdev);
 336         if (ret) {
 337                 vbg_err("vboxguest: Error creating input device: %d\n", ret);
 338                 goto err_vbg_core_exit;
 339         }
 340
 341         ret = devm_request_irq(dev, pci->irq, vbg_core_isr, IRQF_SHARED,
 342                                DEVICE_NAME, gdev);
 343         if (ret) {
 344                 vbg_err("vboxguest: Error requesting irq: %d\n", ret);
 345                 goto err_vbg_core_exit;
 346         }
 347
 348         ret = misc_register(&gdev->misc_device);
 349         if (ret) {
 350                 vbg_err("vboxguest: Error misc_register %s failed: %d\n",
 351                         DEVICE_NAME, ret);
 352                 goto err_vbg_core_exit;
 353         }
 354
 355         ret = misc_register(&gdev->misc_device_user);
 356         if (ret) {
 357                 vbg_err("vboxguest: Error misc_register %s failed: %d\n",
 358                         DEVICE_NAME_USER, ret);
 359                 goto err_unregister_misc_device;
 360         }
 361
 362         mutex_lock(&vbg_gdev_mutex);
 363         if (!vbg_gdev)
 364                 vbg_gdev = gdev;
 365         else
 366                 ret = -EBUSY;
 367         mutex_unlock(&vbg_gdev_mutex);
 368
 369         if (ret) {
 370                 vbg_err("vboxguest: Error more then 1 vbox guest pci device\n");
 371                 goto err_unregister_misc_device_user;
 372         }
 373
 374         pci_set_drvdata(pci, gdev);
 375         device_create_file(dev, &dev_attr_host_version);
 376         device_create_file(dev, &dev_attr_host_features);
 377
 378         vbg_info("vboxguest: misc device minor %d, IRQ %d, I/O port %x, MMIO at %pap (size %pap)\n",
 379                  gdev->misc_device.minor, pci->irq, gdev->io_port,
 380                  &mmio, &mmio_len);
 381
 382         return 0;
 383
 384 err_unregister_misc_device_user:
 385         misc_deregister(&gdev->misc_device_user);
 386 err_unregister_misc_device:
 387         misc_deregister(&gdev->misc_device);
 388 err_vbg_core_exit:
 389         vbg_core_exit(gdev);
 390 err_disable_pcidev:
 391         pci_disable_device(pci);
 392
 393         return ret;
 394 }
 395
 396 static void vbg_pci_remove(struct pci_dev *pci)
 397 {
 398         struct vbg_dev *gdev = pci_get_drvdata(pci);
 399
 400         mutex_lock(&vbg_gdev_mutex);
 401         vbg_gdev = NULL;
 402         mutex_unlock(&vbg_gdev_mutex);
 403
 404         device_remove_file(gdev->dev, &dev_attr_host_features);
 405         device_remove_file(gdev->dev, &dev_attr_host_version);
 406         misc_deregister(&gdev->misc_device_user);
 407         misc_deregister(&gdev->misc_device);
 408         vbg_core_exit(gdev);
 409         pci_disable_device(pci);
 410 }
 411
 412 struct vbg_dev *vbg_get_gdev(void)
 413 {
 414         mutex_lock(&vbg_gdev_mutex);
 415
 416         /*
 417          * Note on success we keep the mutex locked until vbg_put_gdev(),
 418          * this stops vbg_pci_remove from removing the device from underneath
 419          * vboxsf. vboxsf will only hold a reference for a short while.
 420          */
 421         if (vbg_gdev)
 422                 return vbg_gdev;
 423
 424         mutex_unlock(&vbg_gdev_mutex);
 425         return ERR_PTR(-ENODEV);
 426 }
 427 EXPORT_SYMBOL(vbg_get_gdev);
 428
 429 void vbg_put_gdev(struct vbg_dev *gdev)
 430 {
 431         WARN_ON(gdev != vbg_gdev);
 432         mutex_unlock(&vbg_gdev_mutex);
 433 }
 434 EXPORT_SYMBOL(vbg_put_gdev);
 435
 436 /**
 437  * Callback for mouse events.
 438  *
 439  * This is called at the end of the ISR, after leaving the event spinlock, if
 440  * VMMDEV_EVENT_MOUSE_POSITION_CHANGED was raised by the host.
 441  *
 442  * @gdev:               The device extension.
 443  */
 444 void vbg_linux_mouse_event(struct vbg_dev *gdev)
 445 {
 446         int rc;
 447
 448         /* Report events to the kernel input device */
 449         gdev->mouse_status_req->mouse_features = 0;
 450         gdev->mouse_status_req->pointer_pos_x = 0;
 451         gdev->mouse_status_req->pointer_pos_y = 0;
 452         rc = vbg_req_perform(gdev, gdev->mouse_status_req);
 453         if (rc >= 0) {
 454                 input_report_abs(gdev->input, ABS_X,
 455                                  gdev->mouse_status_req->pointer_pos_x);
 456                 input_report_abs(gdev->input, ABS_Y,
 457                                  gdev->mouse_status_req->pointer_pos_y);
 458                 input_sync(gdev->input);
 459         }
 460 }
 461
 462 static const struct pci_device_id vbg_pci_ids[] = {
 463         { .vendor = VBOX_VENDORID, .device = VMMDEV_DEVICEID },
 464         {}
 465 };
 466 MODULE_DEVICE_TABLE(pci,  vbg_pci_ids);
 467
 468 static struct pci_driver vbg_pci_driver = {
 469         .name           = DEVICE_NAME,
 470         .id_table       = vbg_pci_ids,
 471         .probe          = vbg_pci_probe,
 472         .remove         = vbg_pci_remove,
 473 };
 474
 475 module_pci_driver(vbg_pci_driver);
 476
 477 MODULE_AUTHOR("Oracle Corporation");
 478 MODULE_DESCRIPTION("Oracle VM VirtualBox Guest Additions for Linux Module");
 479 MODULE_LICENSE("GPL");