File 0048-input-Add-trace-event-for-empty-key.patch of Package qemu.openSUSE_Leap_42.3_Update

Overview Repositories Revisions Requests Users Attributes Meta

File 0048-input-Add-trace-event-for-empty-key.patch of Package qemu.openSUSE_Leap_42.3_Update (Revision 8bf8d3d266e774a97ca6f3e1a14ea488)

Currently displaying revision 8bf8d3d266e774a97ca6f3e1a14ea488 , Show latest

From 760174d3d6ab5cfc949524b7f7e8ba772ddde7af Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Thu, 30 Mar 2017 16:22:55 +0200
Subject: [PATCH] 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>
[BR: BSC#1031692]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/input/hid.c        | 4 ++++
 hw/input/trace-events | 1 +
 2 files changed, 5 insertions(+)

diff --git a/hw/input/hid.c b/hw/input/hid.c
index a0892e882a..0d049ff61c 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"

Places

File 0048-input-Add-trace-event-for-empty-key.patch of Package qemu.openSUSE_Leap_42.3_Update (Revision 8bf8d3d266e774a97ca6f3e1a14ea488)

Places