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usb-host: claim port

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When configured to pass through a specific host port (using hostbus and
hostport properties), try to claim the port if supported by the kernel.
That will avoid any kernel drivers binding to devices plugged into that
port.  It will not stop any userspace apps (such as usb_modeswitch)
access the device via usbfs though.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2011-08-24 13:34:17 +02:00
parent eb7700bb99
commit 9516bb4772
2 changed files with 58 additions and 0 deletions
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1
trace-events
View File

@ -263,6 +263,7 @@ usb_host_ep_stop_iso(int bus, int addr, int ep) "dev %d:%d, ep %d"
usb_host_reset(int bus, int addr) "dev %d:%d"
usb_host_auto_scan_enabled(void)
usb_host_auto_scan_disabled(void)
usb_host_claim_port(int bus, int hub, int port) "bus %d, hub addr %d, port %d"
# hw/scsi-bus.c
scsi_req_alloc(int target, int lun, int tag) "target %d lun %d tag %d"

57
usb-linux.c
View File

@ -115,6 +115,7 @@ struct USBAutoFilter {
typedef struct USBHostDevice {
USBDevice dev;
int fd;
int hub_fd;
uint8_t descr[8192];
int descr_len;
@ -525,6 +526,9 @@ static void usb_host_handle_destroy(USBDevice *dev)
USBHostDevice *s = (USBHostDevice *)dev;
usb_host_close(s);
if (s->hub_fd != -1) {
close(s->hub_fd);
}
QTAILQ_REMOVE(&hostdevs, s, next);
qemu_remove_exit_notifier(&s->exit);
}
@ -1266,10 +1270,63 @@ static int usb_host_initfn(USBDevice *dev)
dev->auto_attach = 0;
s->fd = -1;
s->hub_fd = -1;
QTAILQ_INSERT_TAIL(&hostdevs, s, next);
s->exit.notify = usb_host_exit_notifier;
qemu_add_exit_notifier(&s->exit);
usb_host_auto_check(NULL);
#ifdef USBDEVFS_CLAIM_PORT
if (s->match.bus_num != 0 && s->match.port != NULL) {
char *h, hub_name[64], line[1024];
int hub_addr, portnr, ret;
snprintf(hub_name, sizeof(hub_name), "%d-%s",
s->match.bus_num, s->match.port);
/* try strip off last ".$portnr" to get hub */
h = strrchr(hub_name, '.');
if (h != NULL) {
portnr = atoi(h+1);
*h = '\0';
} else {
/* no dot in there -> it is the root hub */
snprintf(hub_name, sizeof(hub_name), "usb%d",
s->match.bus_num);
portnr = atoi(s->match.port);
}
if (!usb_host_read_file(line, sizeof(line), "devnum",
hub_name)) {
goto out;
}
if (sscanf(line, "%d", &hub_addr) != 1) {
goto out;
}
if (!usb_host_device_path) {
goto out;
}
snprintf(line, sizeof(line), "%s/%03d/%03d",
usb_host_device_path, s->match.bus_num, hub_addr);
s->hub_fd = open(line, O_RDWR | O_NONBLOCK);
if (s->hub_fd < 0) {
goto out;
}
ret = ioctl(s->hub_fd, USBDEVFS_CLAIM_PORT, &portnr);
if (ret < 0) {
close(s->hub_fd);
s->hub_fd = -1;
goto out;
}
trace_usb_host_claim_port(s->match.bus_num, hub_addr, portnr);
}
out:
#endif
return 0;
}