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hw/rtc/pl031: Send RTC_CHANGE QMP event

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The PL031 currently is not able to report guest RTC change to the QMP
monitor as opposed to mc146818 or spapr RTCs. This patch adds the call
to qapi_event_send_rtc_change() when the Load Register is written. The
value which is reported corresponds to the difference between the guest
reference time and the reference time kept in softmmu/rtc.c.

For instance adding 20s to the guest RTC value will report 20. Adding
an extra 20s to the guest RTC value will report 20 + 20 = 40.

The inclusion of qapi/qapi-types-misc-target.h in hw/rtl/pl031.c
require to compile the PL031 with specific_ss.add() to avoid
./qapi/qapi-types-misc-target.h:18:13: error: attempt to use poisoned
"TARGET_<ARCH>".

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20210920122535.269988-1-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2021-09-20 14:25:35 +02:00 committed by Peter Maydell
parent e5cba10ee1
commit 1adf528ec3
2 changed files with 10 additions and 2 deletions
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2
hw/rtc/meson.build
View File

@ -2,7 +2,7 @@
softmmu_ss.add(when: 'CONFIG_DS1338', if_true: files('ds1338.c'))
softmmu_ss.add(when: 'CONFIG_M41T80', if_true: files('m41t80.c'))
softmmu_ss.add(when: 'CONFIG_M48T59', if_true: files('m48t59.c'))
softmmu_ss.add(when: 'CONFIG_PL031', if_true: files('pl031.c'))
specific_ss.add(when: 'CONFIG_PL031', if_true: files('pl031.c'))
softmmu_ss.add(when: 'CONFIG_TWL92230', if_true: files('twl92230.c'))
softmmu_ss.add(when: ['CONFIG_ISA_BUS', 'CONFIG_M48T59'], if_true: files('m48t59-isa.c'))
softmmu_ss.add(when: 'CONFIG_XLNX_ZYNQMP', if_true: files('xlnx-zynqmp-rtc.c'))

10
hw/rtc/pl031.c
View File

@ -24,6 +24,7 @@
#include "qemu/log.h"
#include "qemu/module.h"
#include "trace.h"
#include "qapi/qapi-events-misc-target.h"
#define RTC_DR 0x00 /* Data read register */
#define RTC_MR 0x04 /* Match register */
@ -136,10 +137,17 @@ static void pl031_write(void * opaque, hwaddr offset,
trace_pl031_write(offset, value);
switch (offset) {
case RTC_LR:
case RTC_LR: {
struct tm tm;
s->tick_offset += value - pl031_get_count(s);
qemu_get_timedate(&tm, s->tick_offset);
qapi_event_send_rtc_change(qemu_timedate_diff(&tm));
pl031_set_alarm(s);
break;
}
case RTC_MR:
s->mr = value;
pl031_set_alarm(s);