acrn-hypervisor/devicemodel/hw/usb_core.c

246 lines
6.4 KiB
C

/*-
* Copyright (c) 2014 Nahanni Systems Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* USB emulation designed as following diagram. It devided into three layers:
* HCD: USB host controller device layer, like xHCI, eHCI...
* USB core: middle abstraction layer for USB statck.
* USB Port Mapper: This layer supports to share physical USB
* devices(physical ports) to spcified virtual USB port of
* HCD DM. All the commands and data transfers are through
* Libusb to access native USB stack.
*
* +---------------+
* | |
* +----------+----------+ |
* | ACRN DM | |
* | +-----------------+ | |
* | | HCD (xHCI) | | |
* | +-----------------+ | |
* | | | |
* | +-----------------+ | |
* | | USB Core | | |
* | +-----------------+ | |
* | | | |
* | +-----------------+ | |
* | | USB Port Mapper | | |
* | +-----------------+ | |
* | | | |
* | +-----------------+ | |
* | | Libusb | | |
* | +-----------------+ | |
* +---------------------+ |
* Service OS User Space | User OS User Space
* |
* -------------------------- | ---------------------------
* |
* Service OS Kernel Space | User OS Kernel Space
* |
* | +-----------------+
* | | USB Core |
* | +-----------------+
* | |
* | +-----------------+
* | | HCD |
* | | (xHCI/uHCI/...) |
* | +--------+--------+
* | |
* +-------------+
* Current distribution:
* HCD: xhci.{h,c}
* USB core: usb_core.{h,c}
* USB device: usb_mouse.c usb_pmapper.{h,c}
*/
#include <sys/types.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include "usb_core.h"
SET_DECLARE(usb_emu_set, struct usb_devemu);
int usb_log_level;
struct usb_devemu *
usb_emu_finddev(char *name)
{
struct usb_devemu **udpp, *udp;
SET_FOREACH(udpp, usb_emu_set) {
udp = *udpp;
if (!strcmp(udp->ue_emu, name))
return udp;
}
return NULL;
}
struct usb_data_xfer_block *
usb_data_xfer_append(struct usb_data_xfer *xfer, void *buf, int blen,
void *hci_data, int ccs)
{
struct usb_data_xfer_block *xb;
if (xfer->ndata >= USB_MAX_XFER_BLOCKS)
return NULL;
xb = &xfer->data[xfer->tail];
xb->buf = buf;
xb->blen = blen;
xb->hci_data = hci_data;
xb->ccs = ccs;
xb->processed = USB_XFER_BLK_FREE;
xb->bdone = 0;
xfer->ndata++;
xfer->tail = (xfer->tail + 1) % USB_MAX_XFER_BLOCKS;
return xb;
}
int
usb_native_is_bus_existed(uint8_t bus_num)
{
char buf[128];
snprintf(buf, sizeof(buf), "%s/usb%d", NATIVE_USBSYS_DEVDIR, bus_num);
return access(buf, R_OK) ? 0 : 1;
}
int
usb_native_is_ss_port(uint8_t bus_of_port)
{
char buf[128];
char speed[8];
int rc, fd;
int usb2_speed_sz = sizeof(NATIVE_USB2_SPEED);
int usb3_speed_sz = sizeof(NATIVE_USB3_SPEED);
assert(usb_native_is_bus_existed(bus_of_port));
snprintf(buf, sizeof(buf), "%s/usb%d/speed", NATIVE_USBSYS_DEVDIR,
bus_of_port);
if (access(buf, R_OK)) {
UPRINTF(LWRN, "can't find speed file\r\n");
return 0;
}
fd = open(buf, O_RDONLY);
if (fd < 0) {
UPRINTF(LWRN, "fail to open maxchild file\r\n");
return 0;
}
rc = read(fd, &speed, sizeof(speed));
if (rc < 0) {
UPRINTF(LWRN, "fail to read speed file\r\n");
goto errout;
}
if (rc < usb2_speed_sz) {
UPRINTF(LWRN, "read invalid speed data\r\n");
goto errout;
}
if (strncmp(speed, NATIVE_USB3_SPEED, usb3_speed_sz))
goto errout;
close(fd);
return 1;
errout:
close(fd);
return 0;
}
int
usb_native_is_port_existed(uint8_t bus_num, uint8_t port_num)
{
int native_port_cnt;
int rc, fd;
char buf[128];
char cnt[8];
if (!usb_native_is_bus_existed(bus_num))
return 0;
snprintf(buf, sizeof(buf), "%s/usb%d/maxchild", NATIVE_USBSYS_DEVDIR,
bus_num);
if (access(buf, R_OK)) {
UPRINTF(LWRN, "can't find maxchild file\r\n");
return 0;
}
fd = open(buf, O_RDONLY);
if (fd < 0) {
UPRINTF(LWRN, "fail to open maxchild file\r\n");
return 0;
}
rc = read(fd, &cnt, sizeof(cnt));
if (rc < 0) {
UPRINTF(LWRN, "fail to read maxchild file\r\n");
close(fd);
return 0;
}
native_port_cnt = atoi(cnt);
if (port_num > native_port_cnt || port_num < 0) {
UPRINTF(LWRN, "invalid port_num %d, max port count %d\r\n",
port_num, native_port_cnt);
close(fd);
return 0;
}
close(fd);
return 1;
}
void usb_parse_log_level(char level)
{
switch (level) {
case 'F':
case 'f':
usb_set_log_level(LFTL);
break;
case 'W':
case 'w':
usb_set_log_level(LWRN);
break;
case 'I':
case 'i':
usb_set_log_level(LINF);
break;
case 'D':
case 'd':
usb_set_log_level(LDBG);
break;
case 'V':
case 'v':
usb_set_log_level(LVRB);
break;
default:
usb_set_log_level(LFTL);
}
}