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

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File 0048-input-Add-trace-event-for-empty-key.patch of Package qemu (Revision 64dd13a7c130b383b12cb439032a85c0)

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From c376e77aa2dd2489101c8d89a55771a67332447b Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Thu, 30 Mar 2017 15:32:08 +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>
[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 fa9cc4c..93887ec 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 f3bfbed..5a87818 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"

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File 0048-input-Add-trace-event-for-empty-key.patch of Package qemu (Revision 64dd13a7c130b383b12cb439032a85c0)

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