49 lines
1.7 KiB
Diff
49 lines
1.7 KiB
Diff
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From 1337d5da71ac778f2eff10554d2de12c95d5e30e Mon Sep 17 00:00:00 2001
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From: Alexander Graf <agraf@suse.de>
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Date: Thu, 30 Mar 2017 15:32:08 +0200
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Subject: [PATCH] input: Add trace event for empty keyboard queue
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When driving QEMU from the outside, we have basically no chance to
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determine how quickly the guest OS picks up key events, so we usually
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have to limit ourselves to very slow keyboard presses to make sure
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the guest always has enough chance to pick them up.
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This patch adds a trace events when the keyboarde queue is drained.
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An external driver can use that as hint that new keys can be pressed.
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Signed-off-by: Alexander Graf <agraf@suse.de>
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[BR: BSC#1031692]
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Signed-off-by: Bruce Rogers <brogers@suse.com>
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---
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hw/input/hid.c | 4 ++++
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hw/input/trace-events | 1 +
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2 files changed, 5 insertions(+)
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diff --git a/hw/input/hid.c b/hw/input/hid.c
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index fa9cc4c616..93887ecc43 100644
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--- a/hw/input/hid.c
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+++ b/hw/input/hid.c
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@@ -256,6 +256,10 @@ static void hid_keyboard_process_keycode(HIDState *hs)
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slot = hs->head & QUEUE_MASK; QUEUE_INCR(hs->head); hs->n--;
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keycode = hs->kbd.keycodes[slot];
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+ if (!hs->n) {
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+ trace_hid_kbd_queue_empty();
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+ }
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+
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key = keycode & 0x7f;
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index = key | ((hs->kbd.modifiers & (1 << 8)) >> 1);
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hid_code = hid_usage_keys[index];
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diff --git a/hw/input/trace-events b/hw/input/trace-events
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index f3bfbede5c..5a87818b49 100644
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--- a/hw/input/trace-events
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+++ b/hw/input/trace-events
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@@ -24,6 +24,7 @@ milkymist_softusb_pulse_irq(void) "Pulse IRQ"
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# hw/input/hid.c
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hid_kbd_queue_full(void) "queue full"
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+hid_kbd_queue_empty(void) "queue empty"
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# hw/input/virtio
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virtio_input_queue_full(void) "queue full"
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