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ps2: set ps/2 output buffer size as the same as kernel 

According to the PS/2 Mouse/Keyboard Protocol, the keyboard outupt buffer size
is 16 bytes. And the PS2_QUEUE_SIZE 256 was introduced in Qemu from the very
beginning.

When I started a  redhat5.6 32bit guest, meanwhile tapped the keyboard as quickly as
possible, the screen would show me "i8042.c: No controller found". As a result,
I couldn't use the keyboard in the VNC client.

Previous discussion about the issue in maillist:
http://thread.gmane.org/gmane.comp.emulators.qemu/43294/focus=47180

This patch has been tested on redhat5.6 32-bit/suse11sp3 64-bit guests.
More easy meathod to reproduce:
1.boot a guest with libvirt.
2.connect to VNC client.
3.as you see the BIOS, bootloader, Linux booting, run the follow simply shell script:
for((i=0;i<10000000;i++)) do virsh send-key redhat5.6 KEY_A; done

Actual results:
dmesg show "i8042.c: No controller found." And the keyboard is out of work.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gonglei 2014-04-24 20:06:19 +08:00 committed by Gerd Hoffmann
parent 1a381811b4
commit 2858ab09e6
1 changed files with 68 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
hw/input/ps2.c
View File

@ -71,10 +71,12 @@
#define MOUSE_STATUS_ENABLED 0x20
#define MOUSE_STATUS_SCALE21 0x10
#define PS2_QUEUE_SIZE 256
#define PS2_QUEUE_SIZE 16 /* Buffer size required by PS/2 protocol */
typedef struct {
uint8_t data[PS2_QUEUE_SIZE];
/* Keep the data array 256 bytes long, which compatibility
with older qemu versions. */
uint8_t data[256];
int rptr, wptr, count;
} PS2Queue;
@ -137,7 +139,7 @@ void ps2_queue(void *opaque, int b)
PS2State *s = (PS2State *)opaque;
PS2Queue *q = &s->queue;
if (q->count >= PS2_QUEUE_SIZE)
if (q->count >= PS2_QUEUE_SIZE - 1)
return;
q->data[q->wptr] = b;
if (++q->wptr == PS2_QUEUE_SIZE)
@ -374,9 +376,8 @@ static void ps2_mouse_event(void *opaque,
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
}
if (!(s->mouse_status & MOUSE_STATUS_REMOTE) &&
(s->common.queue.count < (PS2_QUEUE_SIZE - 16))) {
for(;;) {
if (!(s->mouse_status & MOUSE_STATUS_REMOTE)) {
while (s->common.queue.count < PS2_QUEUE_SIZE - 4) {
/* if not remote, send event. Multiple events are sent if
too big deltas */
ps2_mouse_send_packet(s);
@ -528,6 +529,34 @@ static void ps2_common_reset(PS2State *s)
s->update_irq(s->update_arg, 0);
}
static void ps2_common_post_load(PS2State *s)
{
PS2Queue *q = &s->queue;
int size;
int i;
int tmp_data[PS2_QUEUE_SIZE];
/* set the useful data buffer queue size, < PS2_QUEUE_SIZE */
size = q->count > PS2_QUEUE_SIZE ? 0 : q->count;
/* move the queue elements to the start of data array */
if (size > 0) {
for (i = 0; i < size; i++) {
/* move the queue elements to the temporary buffer */
tmp_data[i] = q->data[q->rptr];
if (++q->rptr == 256) {
q->rptr = 0;
}
}
memcpy(q->data, tmp_data, size);
}
/* reset rptr/wptr/count */
q->rptr = 0;
q->wptr = size;
q->count = size;
s->update_irq(s->update_arg, q->count != 0);
}
static void ps2_kbd_reset(void *opaque)
{
PS2KbdState *s = (PS2KbdState *) opaque;
@ -600,18 +629,31 @@ static const VMStateDescription vmstate_ps2_keyboard_ledstate = {
static int ps2_kbd_post_load(void* opaque, int version_id)
{
PS2KbdState *s = (PS2KbdState*)opaque;
PS2State *ps2 = &s->common;
if (version_id == 2)
s->scancode_set=2;
ps2_common_post_load(ps2);
return 0;
}
static void ps2_kbd_pre_save(void *opaque)
{
PS2KbdState *s = (PS2KbdState *)opaque;
PS2State *ps2 = &s->common;
ps2_common_post_load(ps2);
}
static const VMStateDescription vmstate_ps2_keyboard = {
.name = "ps2kbd",
.version_id = 3,
.minimum_version_id = 2,
.minimum_version_id_old = 2,
.post_load = ps2_kbd_post_load,
.pre_save = ps2_kbd_pre_save,
.fields = (VMStateField []) {
VMSTATE_STRUCT(common, PS2KbdState, 0, vmstate_ps2_common, PS2State),
VMSTATE_INT32(scan_enabled, PS2KbdState),
@ -629,11 +671,31 @@ static const VMStateDescription vmstate_ps2_keyboard = {
}
};
static int ps2_mouse_post_load(void *opaque, int version_id)
{
PS2MouseState *s = (PS2MouseState *)opaque;
PS2State *ps2 = &s->common;
ps2_common_post_load(ps2);
return 0;
}
static void ps2_mouse_pre_save(void *opaque)
{
PS2MouseState *s = (PS2MouseState *)opaque;
PS2State *ps2 = &s->common;
ps2_common_post_load(ps2);
}
static const VMStateDescription vmstate_ps2_mouse = {
.name = "ps2mouse",
.version_id = 2,
.minimum_version_id = 2,
.minimum_version_id_old = 2,
.post_load = ps2_mouse_post_load,
.pre_save = ps2_mouse_pre_save,
.fields = (VMStateField []) {
VMSTATE_STRUCT(common, PS2MouseState, 0, vmstate_ps2_common, PS2State),
VMSTATE_UINT8(mouse_status, PS2MouseState),