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authorAlexander Graf <agraf@suse.de>2017-03-30 16:22:55 +0200
committerGerd Hoffmann <kraxel@redhat.com>2017-05-03 14:20:12 +0200
commit2222e0a633070f7f3eafcc9d0e95e7f1a4e6fe36 (patch)
treee62c1786a56a538634df34d725c09b4c50a884a5 /hw/input
parent05c6638b203fd7d8bbfa88ac6e6198e32ed0506f (diff)
input: Add trace event for empty keyboard queue
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>
Diffstat (limited to 'hw/input')
-rw-r--r--hw/input/hid.c4
-rw-r--r--hw/input/trace-events1
2 files changed, 5 insertions, 0 deletions
diff --git a/hw/input/hid.c b/hw/input/hid.c
index fa9cc4c616..93887ecc43 100644
--- a/hw/input/hid.c
+++ b/hw/input/hid.c
@@ -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];
diff --git a/hw/input/trace-events b/hw/input/trace-events
index f3bfbede5c..5a87818b49 100644
--- a/hw/input/trace-events
+++ b/hw/input/trace-events
@@ -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"