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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c207a10d2f
Currently ST_OK and ST_NA are the only values used to communicate status of a request from a client. Use new error codes to clearly indicate what failed. For example, when client sends request to import a device that isn't export-able, send ST_DEV_BUSY to the client. Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
295 lines
6.8 KiB
C
295 lines
6.8 KiB
C
/*
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* Copyright (C) 2015-2016 Samsung Electronics
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* Igor Kotrasinski <i.kotrasinsk@samsung.com>
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* Krzysztof Opasiak <k.opasiak@samsung.com>
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*
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* Refactored from usbip_host_driver.c, which is:
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* Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
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* 2005-2007 Takahiro Hirofuchi
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <libudev.h>
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#include "usbip_common.h"
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#include "usbip_host_common.h"
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#include "list.h"
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#include "sysfs_utils.h"
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struct udev *udev_context;
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static int32_t read_attr_usbip_status(struct usbip_usb_device *udev)
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{
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char status_attr_path[SYSFS_PATH_MAX];
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int size;
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int fd;
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int length;
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char status;
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int value = 0;
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size = snprintf(status_attr_path, sizeof(status_attr_path),
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"%s/usbip_status", udev->path);
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if (size < 0 || (unsigned int)size >= sizeof(status_attr_path)) {
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err("usbip_status path length %i >= %lu or < 0", size,
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(long unsigned)sizeof(status_attr_path));
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return -1;
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}
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fd = open(status_attr_path, O_RDONLY);
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if (fd < 0) {
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err("error opening attribute %s", status_attr_path);
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return -1;
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}
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length = read(fd, &status, 1);
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if (length < 0) {
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err("error reading attribute %s", status_attr_path);
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close(fd);
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return -1;
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}
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value = atoi(&status);
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return value;
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}
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static
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struct usbip_exported_device *usbip_exported_device_new(
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struct usbip_host_driver *hdriver, const char *sdevpath)
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{
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struct usbip_exported_device *edev = NULL;
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struct usbip_exported_device *edev_old;
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size_t size;
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int i;
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edev = calloc(1, sizeof(struct usbip_exported_device));
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edev->sudev =
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udev_device_new_from_syspath(udev_context, sdevpath);
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if (!edev->sudev) {
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err("udev_device_new_from_syspath: %s", sdevpath);
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goto err;
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}
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if (hdriver->ops.read_device(edev->sudev, &edev->udev) < 0)
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goto err;
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edev->status = read_attr_usbip_status(&edev->udev);
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if (edev->status < 0)
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goto err;
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/* reallocate buffer to include usb interface data */
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size = sizeof(struct usbip_exported_device) +
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edev->udev.bNumInterfaces * sizeof(struct usbip_usb_interface);
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edev_old = edev;
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edev = realloc(edev, size);
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if (!edev) {
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edev = edev_old;
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dbg("realloc failed");
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goto err;
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}
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for (i = 0; i < edev->udev.bNumInterfaces; i++) {
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/* vudc does not support reading interfaces */
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if (!hdriver->ops.read_interface)
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break;
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hdriver->ops.read_interface(&edev->udev, i, &edev->uinf[i]);
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}
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return edev;
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err:
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if (edev->sudev)
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udev_device_unref(edev->sudev);
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if (edev)
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free(edev);
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return NULL;
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}
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static int refresh_exported_devices(struct usbip_host_driver *hdriver)
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{
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struct usbip_exported_device *edev;
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struct udev_enumerate *enumerate;
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struct udev_list_entry *devices, *dev_list_entry;
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struct udev_device *dev;
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const char *path;
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enumerate = udev_enumerate_new(udev_context);
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udev_enumerate_add_match_subsystem(enumerate, hdriver->udev_subsystem);
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udev_enumerate_scan_devices(enumerate);
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devices = udev_enumerate_get_list_entry(enumerate);
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udev_list_entry_foreach(dev_list_entry, devices) {
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path = udev_list_entry_get_name(dev_list_entry);
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dev = udev_device_new_from_syspath(udev_context,
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path);
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if (dev == NULL)
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continue;
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/* Check whether device uses usbip driver. */
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if (hdriver->ops.is_my_device(dev)) {
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edev = usbip_exported_device_new(hdriver, path);
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if (!edev) {
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dbg("usbip_exported_device_new failed");
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continue;
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}
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list_add(&edev->node, &hdriver->edev_list);
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hdriver->ndevs++;
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}
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}
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return 0;
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}
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static void usbip_exported_device_destroy(struct list_head *devs)
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{
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struct list_head *i, *tmp;
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struct usbip_exported_device *edev;
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list_for_each_safe(i, tmp, devs) {
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edev = list_entry(i, struct usbip_exported_device, node);
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list_del(i);
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free(edev);
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}
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}
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int usbip_generic_driver_open(struct usbip_host_driver *hdriver)
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{
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int rc;
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udev_context = udev_new();
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if (!udev_context) {
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err("udev_new failed");
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return -1;
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}
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rc = refresh_exported_devices(hdriver);
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if (rc < 0)
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goto err;
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return 0;
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err:
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udev_unref(udev_context);
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return -1;
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}
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void usbip_generic_driver_close(struct usbip_host_driver *hdriver)
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{
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if (!hdriver)
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return;
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usbip_exported_device_destroy(&hdriver->edev_list);
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udev_unref(udev_context);
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}
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int usbip_generic_refresh_device_list(struct usbip_host_driver *hdriver)
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{
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int rc;
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usbip_exported_device_destroy(&hdriver->edev_list);
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hdriver->ndevs = 0;
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INIT_LIST_HEAD(&hdriver->edev_list);
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rc = refresh_exported_devices(hdriver);
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if (rc < 0)
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return -1;
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return 0;
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}
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int usbip_export_device(struct usbip_exported_device *edev, int sockfd)
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{
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char attr_name[] = "usbip_sockfd";
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char sockfd_attr_path[SYSFS_PATH_MAX];
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int size;
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char sockfd_buff[30];
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int ret;
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if (edev->status != SDEV_ST_AVAILABLE) {
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dbg("device not available: %s", edev->udev.busid);
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switch (edev->status) {
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case SDEV_ST_ERROR:
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dbg("status SDEV_ST_ERROR");
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ret = ST_DEV_ERR;
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break;
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case SDEV_ST_USED:
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dbg("status SDEV_ST_USED");
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ret = ST_DEV_BUSY;
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break;
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default:
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dbg("status unknown: 0x%x", edev->status);
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ret = -1;
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}
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return ret;
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}
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/* only the first interface is true */
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size = snprintf(sockfd_attr_path, sizeof(sockfd_attr_path), "%s/%s",
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edev->udev.path, attr_name);
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if (size < 0 || (unsigned int)size >= sizeof(sockfd_attr_path)) {
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err("exported device path length %i >= %lu or < 0", size,
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(long unsigned)sizeof(sockfd_attr_path));
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return -1;
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}
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size = snprintf(sockfd_buff, sizeof(sockfd_buff), "%d\n", sockfd);
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if (size < 0 || (unsigned int)size >= sizeof(sockfd_buff)) {
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err("socket length %i >= %lu or < 0", size,
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(long unsigned)sizeof(sockfd_buff));
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return -1;
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}
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ret = write_sysfs_attribute(sockfd_attr_path, sockfd_buff,
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strlen(sockfd_buff));
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if (ret < 0) {
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err("write_sysfs_attribute failed: sockfd %s to %s",
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sockfd_buff, sockfd_attr_path);
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return ret;
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}
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info("connect: %s", edev->udev.busid);
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return ret;
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}
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struct usbip_exported_device *usbip_generic_get_device(
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struct usbip_host_driver *hdriver, int num)
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{
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struct list_head *i;
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struct usbip_exported_device *edev;
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int cnt = 0;
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list_for_each(i, &hdriver->edev_list) {
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edev = list_entry(i, struct usbip_exported_device, node);
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if (num == cnt)
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return edev;
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cnt++;
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}
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return NULL;
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}
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