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input: Add trace event for empty keyboard queue

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When driving QEMU from the outside, we have basically no chance to
determine how quickly the guest OS picks up key events, so we usually
have to limit ourselves to very slow keyboard presses to make sure
the guest always has enough chance to pick them up.

This patch adds a trace events when the keyboarde queue is drained.
An external driver can use that as hint that new keys can be pressed.

Signed-off-by: Alexander Graf <agraf@suse.de>
Message-id: 1490883775-94658-1-git-send-email-agraf@suse.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Alexander Graf 2017-03-30 16:22:55 +02:00 committed by Gerd Hoffmann
parent 05c6638b20
commit 2222e0a633
2 changed files with 5 additions and 0 deletions
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4
hw/input/hid.c
View file

@ -256,6 +256,10 @@ static void hid_keyboard_process_keycode(HIDState *hs)
slot = hs->head & QUEUE_MASK; QUEUE_INCR(hs->head); hs->n--;
keycode = hs->kbd.keycodes[slot];
if (!hs->n) {
trace_hid_kbd_queue_empty();
}
key = keycode & 0x7f;
index = key | ((hs->kbd.modifiers & (1 << 8)) >> 1);
hid_code = hid_usage_keys[index];

1
hw/input/trace-events
View file

@ -24,6 +24,7 @@ milkymist_softusb_pulse_irq(void) "Pulse IRQ"
# hw/input/hid.c
hid_kbd_queue_full(void) "queue full"
hid_kbd_queue_empty(void) "queue empty"
# hw/input/virtio
virtio_input_queue_full(void) "queue full"