483 lines
12 KiB
C
483 lines
12 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* vboxguest linux pci driver, char-dev and input-device code,
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*
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* Copyright (C) 2006-2016 Oracle Corporation
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*/
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#include <linux/input.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/poll.h>
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#include <linux/vbox_utils.h>
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#include "vboxguest_core.h"
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/** The device name. */
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#define DEVICE_NAME "vboxguest"
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/** The device name for the device node open to everyone. */
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#define DEVICE_NAME_USER "vboxuser"
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/** VirtualBox PCI vendor ID. */
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#define VBOX_VENDORID 0x80ee
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/** VMMDev PCI card product ID. */
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#define VMMDEV_DEVICEID 0xcafe
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/** Mutex protecting the global vbg_gdev pointer used by vbg_get/put_gdev. */
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static DEFINE_MUTEX(vbg_gdev_mutex);
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/** Global vbg_gdev pointer used by vbg_get/put_gdev. */
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static struct vbg_dev *vbg_gdev;
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static int vbg_misc_device_open(struct inode *inode, struct file *filp)
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{
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struct vbg_session *session;
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struct vbg_dev *gdev;
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/* misc_open sets filp->private_data to our misc device */
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gdev = container_of(filp->private_data, struct vbg_dev, misc_device);
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session = vbg_core_open_session(gdev, false);
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if (IS_ERR(session))
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return PTR_ERR(session);
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filp->private_data = session;
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return 0;
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}
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static int vbg_misc_device_user_open(struct inode *inode, struct file *filp)
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{
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struct vbg_session *session;
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struct vbg_dev *gdev;
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/* misc_open sets filp->private_data to our misc device */
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gdev = container_of(filp->private_data, struct vbg_dev,
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misc_device_user);
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session = vbg_core_open_session(gdev, false);
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if (IS_ERR(session))
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return PTR_ERR(session);
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filp->private_data = session;
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return 0;
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}
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/**
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* Close device.
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* Return: 0 on success, negated errno on failure.
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* @inode: Pointer to inode info structure.
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* @filp: Associated file pointer.
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*/
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static int vbg_misc_device_close(struct inode *inode, struct file *filp)
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{
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vbg_core_close_session(filp->private_data);
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filp->private_data = NULL;
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return 0;
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}
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/**
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* Device I/O Control entry point.
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* Return: 0 on success, negated errno on failure.
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* @filp: Associated file pointer.
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* @req: The request specified to ioctl().
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* @arg: The argument specified to ioctl().
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*/
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static long vbg_misc_device_ioctl(struct file *filp, unsigned int req,
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unsigned long arg)
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{
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struct vbg_session *session = filp->private_data;
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size_t returned_size, size;
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struct vbg_ioctl_hdr hdr;
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bool is_vmmdev_req;
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int ret = 0;
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void *buf;
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if (copy_from_user(&hdr, (void *)arg, sizeof(hdr)))
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return -EFAULT;
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if (hdr.version != VBG_IOCTL_HDR_VERSION)
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return -EINVAL;
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if (hdr.size_in < sizeof(hdr) ||
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(hdr.size_out && hdr.size_out < sizeof(hdr)))
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return -EINVAL;
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size = max(hdr.size_in, hdr.size_out);
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if (_IOC_SIZE(req) && _IOC_SIZE(req) != size)
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return -EINVAL;
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if (size > SZ_16M)
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return -E2BIG;
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/*
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* IOCTL_VMMDEV_REQUEST needs the buffer to be below 4G to avoid
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* the need for a bounce-buffer and another copy later on.
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*/
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is_vmmdev_req = (req & ~IOCSIZE_MASK) == VBG_IOCTL_VMMDEV_REQUEST(0) ||
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req == VBG_IOCTL_VMMDEV_REQUEST_BIG ||
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req == VBG_IOCTL_VMMDEV_REQUEST_BIG_ALT;
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if (is_vmmdev_req)
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buf = vbg_req_alloc(size, VBG_IOCTL_HDR_TYPE_DEFAULT);
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else
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buf = kmalloc(size, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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*((struct vbg_ioctl_hdr *)buf) = hdr;
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if (copy_from_user(buf + sizeof(hdr), (void *)arg + sizeof(hdr),
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hdr.size_in - sizeof(hdr))) {
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ret = -EFAULT;
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goto out;
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}
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if (hdr.size_in < size)
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memset(buf + hdr.size_in, 0, size - hdr.size_in);
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ret = vbg_core_ioctl(session, req, buf);
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if (ret)
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goto out;
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returned_size = ((struct vbg_ioctl_hdr *)buf)->size_out;
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if (returned_size > size) {
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vbg_debug("%s: too much output data %zu > %zu\n",
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__func__, returned_size, size);
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returned_size = size;
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}
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if (copy_to_user((void *)arg, buf, returned_size) != 0)
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ret = -EFAULT;
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out:
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if (is_vmmdev_req)
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vbg_req_free(buf, size);
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else
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kfree(buf);
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return ret;
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}
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/** The file_operations structures. */
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static const struct file_operations vbg_misc_device_fops = {
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.owner = THIS_MODULE,
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.open = vbg_misc_device_open,
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.release = vbg_misc_device_close,
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.unlocked_ioctl = vbg_misc_device_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = vbg_misc_device_ioctl,
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#endif
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};
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static const struct file_operations vbg_misc_device_user_fops = {
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.owner = THIS_MODULE,
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.open = vbg_misc_device_user_open,
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.release = vbg_misc_device_close,
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.unlocked_ioctl = vbg_misc_device_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = vbg_misc_device_ioctl,
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#endif
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};
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/**
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* Called when the input device is first opened.
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*
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* Sets up absolute mouse reporting.
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*/
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static int vbg_input_open(struct input_dev *input)
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{
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struct vbg_dev *gdev = input_get_drvdata(input);
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u32 feat = VMMDEV_MOUSE_GUEST_CAN_ABSOLUTE | VMMDEV_MOUSE_NEW_PROTOCOL;
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int ret;
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ret = vbg_core_set_mouse_status(gdev, feat);
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if (ret)
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return ret;
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return 0;
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}
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/**
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* Called if all open handles to the input device are closed.
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*
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* Disables absolute reporting.
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*/
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static void vbg_input_close(struct input_dev *input)
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{
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struct vbg_dev *gdev = input_get_drvdata(input);
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vbg_core_set_mouse_status(gdev, 0);
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}
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/**
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* Creates the kernel input device.
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*
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* Return: 0 on success, negated errno on failure.
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*/
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static int vbg_create_input_device(struct vbg_dev *gdev)
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{
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struct input_dev *input;
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input = devm_input_allocate_device(gdev->dev);
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if (!input)
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return -ENOMEM;
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input->id.bustype = BUS_PCI;
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input->id.vendor = VBOX_VENDORID;
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input->id.product = VMMDEV_DEVICEID;
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input->open = vbg_input_open;
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input->close = vbg_input_close;
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input->dev.parent = gdev->dev;
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input->name = "VirtualBox mouse integration";
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input_set_abs_params(input, ABS_X, VMMDEV_MOUSE_RANGE_MIN,
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VMMDEV_MOUSE_RANGE_MAX, 0, 0);
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input_set_abs_params(input, ABS_Y, VMMDEV_MOUSE_RANGE_MIN,
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VMMDEV_MOUSE_RANGE_MAX, 0, 0);
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input_set_capability(input, EV_KEY, BTN_MOUSE);
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input_set_drvdata(input, gdev);
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gdev->input = input;
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return input_register_device(gdev->input);
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}
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static ssize_t host_version_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct vbg_dev *gdev = dev_get_drvdata(dev);
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return sprintf(buf, "%s\n", gdev->host_version);
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}
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static ssize_t host_features_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct vbg_dev *gdev = dev_get_drvdata(dev);
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return sprintf(buf, "%#x\n", gdev->host_features);
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}
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static DEVICE_ATTR_RO(host_version);
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static DEVICE_ATTR_RO(host_features);
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/**
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* Does the PCI detection and init of the device.
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*
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* Return: 0 on success, negated errno on failure.
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*/
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static int vbg_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
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{
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struct device *dev = &pci->dev;
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resource_size_t io, io_len, mmio, mmio_len;
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struct vmmdev_memory *vmmdev;
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struct vbg_dev *gdev;
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int ret;
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gdev = devm_kzalloc(dev, sizeof(*gdev), GFP_KERNEL);
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if (!gdev)
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return -ENOMEM;
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ret = pci_enable_device(pci);
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if (ret != 0) {
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vbg_err("vboxguest: Error enabling device: %d\n", ret);
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return ret;
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}
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ret = -ENODEV;
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io = pci_resource_start(pci, 0);
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io_len = pci_resource_len(pci, 0);
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if (!io || !io_len) {
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vbg_err("vboxguest: Error IO-port resource (0) is missing\n");
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goto err_disable_pcidev;
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}
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if (devm_request_region(dev, io, io_len, DEVICE_NAME) == NULL) {
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vbg_err("vboxguest: Error could not claim IO resource\n");
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ret = -EBUSY;
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goto err_disable_pcidev;
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}
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mmio = pci_resource_start(pci, 1);
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mmio_len = pci_resource_len(pci, 1);
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if (!mmio || !mmio_len) {
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vbg_err("vboxguest: Error MMIO resource (1) is missing\n");
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goto err_disable_pcidev;
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}
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if (devm_request_mem_region(dev, mmio, mmio_len, DEVICE_NAME) == NULL) {
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vbg_err("vboxguest: Error could not claim MMIO resource\n");
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ret = -EBUSY;
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goto err_disable_pcidev;
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}
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vmmdev = devm_ioremap(dev, mmio, mmio_len);
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if (!vmmdev) {
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vbg_err("vboxguest: Error ioremap failed; MMIO addr=%pap size=%pap\n",
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&mmio, &mmio_len);
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goto err_disable_pcidev;
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}
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/* Validate MMIO region version and size. */
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if (vmmdev->version != VMMDEV_MEMORY_VERSION ||
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vmmdev->size < 32 || vmmdev->size > mmio_len) {
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vbg_err("vboxguest: Bogus VMMDev memory; version=%08x (expected %08x) size=%d (expected <= %d)\n",
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vmmdev->version, VMMDEV_MEMORY_VERSION,
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vmmdev->size, (int)mmio_len);
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goto err_disable_pcidev;
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}
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gdev->io_port = io;
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gdev->mmio = vmmdev;
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gdev->dev = dev;
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gdev->misc_device.minor = MISC_DYNAMIC_MINOR;
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gdev->misc_device.name = DEVICE_NAME;
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gdev->misc_device.fops = &vbg_misc_device_fops;
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gdev->misc_device_user.minor = MISC_DYNAMIC_MINOR;
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gdev->misc_device_user.name = DEVICE_NAME_USER;
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gdev->misc_device_user.fops = &vbg_misc_device_user_fops;
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ret = vbg_core_init(gdev, VMMDEV_EVENT_MOUSE_POSITION_CHANGED);
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if (ret)
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goto err_disable_pcidev;
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ret = vbg_create_input_device(gdev);
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if (ret) {
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vbg_err("vboxguest: Error creating input device: %d\n", ret);
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goto err_vbg_core_exit;
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}
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ret = devm_request_irq(dev, pci->irq, vbg_core_isr, IRQF_SHARED,
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DEVICE_NAME, gdev);
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if (ret) {
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vbg_err("vboxguest: Error requesting irq: %d\n", ret);
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goto err_vbg_core_exit;
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}
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ret = misc_register(&gdev->misc_device);
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if (ret) {
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vbg_err("vboxguest: Error misc_register %s failed: %d\n",
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DEVICE_NAME, ret);
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goto err_vbg_core_exit;
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}
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ret = misc_register(&gdev->misc_device_user);
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if (ret) {
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vbg_err("vboxguest: Error misc_register %s failed: %d\n",
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|
|
DEVICE_NAME_USER, ret);
|
||
|
|
goto err_unregister_misc_device;
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_lock(&vbg_gdev_mutex);
|
||
|
|
if (!vbg_gdev)
|
||
|
|
vbg_gdev = gdev;
|
||
|
|
else
|
||
|
|
ret = -EBUSY;
|
||
|
|
mutex_unlock(&vbg_gdev_mutex);
|
||
|
|
|
||
|
|
if (ret) {
|
||
|
|
vbg_err("vboxguest: Error more then 1 vbox guest pci device\n");
|
||
|
|
goto err_unregister_misc_device_user;
|
||
|
|
}
|
||
|
|
|
||
|
|
pci_set_drvdata(pci, gdev);
|
||
|
|
device_create_file(dev, &dev_attr_host_version);
|
||
|
|
device_create_file(dev, &dev_attr_host_features);
|
||
|
|
|
||
|
|
vbg_info("vboxguest: misc device minor %d, IRQ %d, I/O port %x, MMIO at %pap (size %pap)\n",
|
||
|
|
gdev->misc_device.minor, pci->irq, gdev->io_port,
|
||
|
|
&mmio, &mmio_len);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err_unregister_misc_device_user:
|
||
|
|
misc_deregister(&gdev->misc_device_user);
|
||
|
|
err_unregister_misc_device:
|
||
|
|
misc_deregister(&gdev->misc_device);
|
||
|
|
err_vbg_core_exit:
|
||
|
|
vbg_core_exit(gdev);
|
||
|
|
err_disable_pcidev:
|
||
|
|
pci_disable_device(pci);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void vbg_pci_remove(struct pci_dev *pci)
|
||
|
|
{
|
||
|
|
struct vbg_dev *gdev = pci_get_drvdata(pci);
|
||
|
|
|
||
|
|
mutex_lock(&vbg_gdev_mutex);
|
||
|
|
vbg_gdev = NULL;
|
||
|
|
mutex_unlock(&vbg_gdev_mutex);
|
||
|
|
|
||
|
|
device_remove_file(gdev->dev, &dev_attr_host_features);
|
||
|
|
device_remove_file(gdev->dev, &dev_attr_host_version);
|
||
|
|
misc_deregister(&gdev->misc_device_user);
|
||
|
|
misc_deregister(&gdev->misc_device);
|
||
|
|
vbg_core_exit(gdev);
|
||
|
|
pci_disable_device(pci);
|
||
|
|
}
|
||
|
|
|
||
|
|
struct vbg_dev *vbg_get_gdev(void)
|
||
|
|
{
|
||
|
|
mutex_lock(&vbg_gdev_mutex);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Note on success we keep the mutex locked until vbg_put_gdev(),
|
||
|
|
* this stops vbg_pci_remove from removing the device from underneath
|
||
|
|
* vboxsf. vboxsf will only hold a reference for a short while.
|
||
|
|
*/
|
||
|
|
if (vbg_gdev)
|
||
|
|
return vbg_gdev;
|
||
|
|
|
||
|
|
mutex_unlock(&vbg_gdev_mutex);
|
||
|
|
return ERR_PTR(-ENODEV);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(vbg_get_gdev);
|
||
|
|
|
||
|
|
void vbg_put_gdev(struct vbg_dev *gdev)
|
||
|
|
{
|
||
|
|
WARN_ON(gdev != vbg_gdev);
|
||
|
|
mutex_unlock(&vbg_gdev_mutex);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(vbg_put_gdev);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Callback for mouse events.
|
||
|
|
*
|
||
|
|
* This is called at the end of the ISR, after leaving the event spinlock, if
|
||
|
|
* VMMDEV_EVENT_MOUSE_POSITION_CHANGED was raised by the host.
|
||
|
|
*
|
||
|
|
* @gdev: The device extension.
|
||
|
|
*/
|
||
|
|
void vbg_linux_mouse_event(struct vbg_dev *gdev)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
/* Report events to the kernel input device */
|
||
|
|
gdev->mouse_status_req->mouse_features = 0;
|
||
|
|
gdev->mouse_status_req->pointer_pos_x = 0;
|
||
|
|
gdev->mouse_status_req->pointer_pos_y = 0;
|
||
|
|
rc = vbg_req_perform(gdev, gdev->mouse_status_req);
|
||
|
|
if (rc >= 0) {
|
||
|
|
input_report_abs(gdev->input, ABS_X,
|
||
|
|
gdev->mouse_status_req->pointer_pos_x);
|
||
|
|
input_report_abs(gdev->input, ABS_Y,
|
||
|
|
gdev->mouse_status_req->pointer_pos_y);
|
||
|
|
input_sync(gdev->input);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct pci_device_id vbg_pci_ids[] = {
|
||
|
|
{ .vendor = VBOX_VENDORID, .device = VMMDEV_DEVICEID },
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(pci, vbg_pci_ids);
|
||
|
|
|
||
|
|
static struct pci_driver vbg_pci_driver = {
|
||
|
|
.name = DEVICE_NAME,
|
||
|
|
.id_table = vbg_pci_ids,
|
||
|
|
.probe = vbg_pci_probe,
|
||
|
|
.remove = vbg_pci_remove,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_pci_driver(vbg_pci_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Oracle Corporation");
|
||
|
|
MODULE_DESCRIPTION("Oracle VM VirtualBox Guest Additions for Linux Module");
|
||
|
|
MODULE_LICENSE("GPL");
|