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input: add trace events for full queues 

It isn't unusual to happen, for example during reboot when the guest
doesn't reveice events for a while.  So better don't flood stderr
with alarming messages.  Turn them into tracepoints instead so they
can be enabled in case they are needed for trouble-shooting.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1466675495-28797-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2016-06-23 11:51:35 +02:00
parent d7b7f526b1
commit c80276b420
3 changed files with 10 additions and 2 deletions
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3
hw/input/hid.c
View File

@ -27,6 +27,7 @@
#include "ui/console.h"
#include "qemu/timer.h"
#include "hw/input/hid.h"
#include "trace.h"
#define HID_USAGE_ERROR_ROLLOVER 0x01
#define HID_USAGE_POSTFAIL 0x02
@ -234,7 +235,7 @@ static void hid_keyboard_event(DeviceState *dev, QemuConsole *src,
key->down,
scancodes);
if (hs->n + count > QUEUE_LENGTH) {
fprintf(stderr, "usb-kbd: warning: key event queue full\n");
trace_hid_kbd_queue_full();
return;
}
for (i = 0; i < count; i++) {

6
hw/input/trace-events
View File

@ -23,3 +23,9 @@ milkymist_softusb_memory_write(uint32_t addr, uint32_t value) "addr %08x value %
milkymist_softusb_mevt(uint8_t m) "m %d"
milkymist_softusb_kevt(uint8_t m) "m %d"
milkymist_softusb_pulse_irq(void) "Pulse IRQ"
# hw/input/hid.c
hid_kbd_queue_full(void) "queue full"
# hw/input/virtio
virtio_input_queue_full(void) "queue full"

3
hw/input/virtio-input.c
View File

@ -7,6 +7,7 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/iov.h"
#include "trace.h"
#include "hw/qdev.h"
#include "hw/virtio/virtio.h"
@ -47,7 +48,7 @@ void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event)
virtqueue_get_avail_bytes(vinput->evt, &have, NULL, need, 0);
if (have < need) {
vinput->qindex = 0;
fprintf(stderr, "%s: ENOSPC in vq, dropping events\n", __func__);
trace_virtio_input_queue_full();
return;
}