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authorGerd Hoffmann <kraxel@redhat.com>2011-11-16 12:37:17 +0100
committerGerd Hoffmann <kraxel@redhat.com>2011-11-23 17:17:17 +0100
commitc7662daaa2898fa5a9a39bc51985cd1dd08af988 (patch)
tree6f4df233c8ad782fa2b542b93b162f6239b8bbd0
parent335b8d2068cbc56ce86b3c89b0fcd1c1eb4b61e2 (diff)
downloadqemu-arm-c7662daaa2898fa5a9a39bc51985cd1dd08af988.tar.gz
usb-host: add usb_host_do_reset function.
Add a special function to reset the host usb device. It tracks the time needed by the USBDEVFS_RESET ioctl and prints a warning in case it needs too long. Usually it should be finished in 200 - 300 miliseconds. Warning threshold is one second. Intention is to help troubleshooting by indicating that the usb device stopped responding even to a reset request and is possibly broken. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
-rw-r--r--usb-linux.c25
1 files changed, 22 insertions, 3 deletions
diff --git a/usb-linux.c b/usb-linux.c
index d4426ea730..ab4c6930ca 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -148,6 +148,25 @@ static int usb_host_read_file(char *line, size_t line_size,
const char *device_file, const char *device_name);
static int usb_linux_update_endp_table(USBHostDevice *s);
+static int usb_host_do_reset(USBHostDevice *dev)
+{
+ struct timeval s, e;
+ uint32_t usecs;
+ int ret;
+
+ gettimeofday(&s, NULL);
+ ret = ioctl(dev->fd, USBDEVFS_RESET);
+ gettimeofday(&e, NULL);
+ usecs = (e.tv_sec - s.tv_sec) * 1000000;
+ usecs += e.tv_usec - s.tv_usec;
+ if (usecs > 1000000) {
+ /* more than a second, something is fishy, broken usb device? */
+ fprintf(stderr, "husb: device %d:%d reset took %d.%06d seconds\n",
+ dev->bus_num, dev->addr, usecs / 1000000, usecs % 1000000);
+ }
+ return ret;
+}
+
static struct endp_data *get_endp(USBHostDevice *s, int pid, int ep)
{
struct endp_data *eps = pid == USB_TOKEN_IN ? s->ep_in : s->ep_out;
@@ -606,7 +625,7 @@ static void usb_host_handle_reset(USBDevice *dev)
trace_usb_host_reset(s->bus_num, s->addr);
- ioctl(s->fd, USBDEVFS_RESET);
+ usb_host_do_reset(s);;
usb_host_claim_interfaces(s, 0);
usb_linux_update_endp_table(s);
@@ -1370,7 +1389,7 @@ static int usb_host_close(USBHostDevice *dev)
if (dev->dev.attached) {
usb_device_detach(&dev->dev);
}
- ioctl(dev->fd, USBDEVFS_RESET);
+ usb_host_do_reset(dev);
close(dev->fd);
dev->fd = -1;
return 0;
@@ -1381,7 +1400,7 @@ static void usb_host_exit_notifier(struct Notifier *n, void *data)
USBHostDevice *s = container_of(n, USBHostDevice, exit);
if (s->fd != -1) {
- ioctl(s->fd, USBDEVFS_RESET);
+ usb_host_do_reset(s);;
}
}