Re: [PATCH v3 09/24] macio: Fix to realize "mos6522-cuda" and "mos6522-pmu" devices

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 6/15/20 7:26 AM, Markus Armbruster wrote:
> Peter, forgot to cc: you.  May I have your blessings for this version?

This file is maintained by Mark:

./scripts/get_maintainer.pl -f hw/misc/macio/cuda.c
Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> (odd fixer:Old World
(g3beige))
David Gibson <david@gibson.dropbear.id.au> (reviewer:Old World (g3beige))
qemu-ppc@nongnu.org (open list:Old World (g3beige))

Mark only check qemu-devel during week-end. Too bad you forgot
to Cc him, has he did a review pass over the last WE.

> 
> Markus Armbruster <armbru@redhat.com> writes:
> 
>> cuda_init() creates a "mos6522-cuda" device, but it's never realized.
>> Affects machines mac99 with via=cuda (default) and g3beige.
>>
>> pmu_init() creates a "mos6522-pmu" device, but it's never realized.
>> Affects machine mac99 with via=pmu and via=pmu-adb,
>>
>> In theory, a device becomes real only on realize.  In practice, the
>> transition from unreal to real is a fuzzy one.  The work to make a
>> device real can be spread between realize methods (fine),
>> instance_init methods (wrong), and board code wiring up the device
>> (fine as long as it effectively happens on realize).  Depending on
>> what exactly is done where, a device can work even when we neglect
>> to realize it.
>>
>> These two appear to work.  Nevertheless, it's a clear misuse of the
>> interface.  Even when it works today (more or less by chance), it can
>> break tomorrow.
>>
>> Fix by realizing them in cuda_realize() and pmu_realize(),
>> respectively.
>>
>> Fixes: 6dca62a0000f95e0b7020aa00d0ca9b2c421f341
>> Cc: Laurent Vivier <laurent@vivier.eu>
>> Signed-off-by: Markus Armbruster <armbru@redhat.com>

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

>> ---
>>  hw/misc/macio/cuda.c | 15 ++++++++++-----
>>  hw/misc/macio/pmu.c  | 15 ++++++++++-----
>>  2 files changed, 20 insertions(+), 10 deletions(-)
>>
>> diff --git a/hw/misc/macio/cuda.c b/hw/misc/macio/cuda.c
>> index e0cc0aac5d..3cb10c743c 100644
>> --- a/hw/misc/macio/cuda.c
>> +++ b/hw/misc/macio/cuda.c
>> @@ -33,6 +33,7 @@
>>  #include "hw/misc/macio/cuda.h"
>>  #include "qemu/timer.h"
>>  #include "sysemu/runstate.h"
>> +#include "qapi/error.h"
>>  #include "qemu/cutils.h"
>>  #include "qemu/log.h"
>>  #include "qemu/module.h"
>> @@ -522,16 +523,20 @@ static void cuda_reset(DeviceState *dev)
>>  static void cuda_realize(DeviceState *dev, Error **errp)
>>  {
>>      CUDAState *s = CUDA(dev);
>> +    Error *err = NULL;
>>      SysBusDevice *sbd;
>> -    MOS6522State *ms;
>> -    DeviceState *d;
>>      struct tm tm;
>>  
>> +    object_property_set_bool(OBJECT(&s->mos6522_cuda), true, "realized",
>> +                             &err);
>> +    if (err) {
>> +        error_propagate(errp, err);
>> +        return;
>> +    }
>> +
>>      /* Pass IRQ from 6522 */
>> -    d = DEVICE(&s->mos6522_cuda);
>> -    ms = MOS6522(d);
>>      sbd = SYS_BUS_DEVICE(s);
>> -    sysbus_pass_irq(sbd, SYS_BUS_DEVICE(ms));
>> +    sysbus_pass_irq(sbd, SYS_BUS_DEVICE(&s->mos6522_cuda));
>>  
>>      qemu_get_timedate(&tm, 0);
>>      s->tick_offset = (uint32_t)mktimegm(&tm) + RTC_OFFSET;
>> diff --git a/hw/misc/macio/pmu.c b/hw/misc/macio/pmu.c
>> index 9a9cd427e1..0895b78b59 100644
>> --- a/hw/misc/macio/pmu.c
>> +++ b/hw/misc/macio/pmu.c
>> @@ -40,6 +40,7 @@
>>  #include "hw/misc/macio/pmu.h"
>>  #include "qemu/timer.h"
>>  #include "sysemu/runstate.h"
>> +#include "qapi/error.h"
>>  #include "qemu/cutils.h"
>>  #include "qemu/log.h"
>>  #include "qemu/module.h"
>> @@ -739,16 +740,20 @@ static void pmu_reset(DeviceState *dev)
>>  static void pmu_realize(DeviceState *dev, Error **errp)
>>  {
>>      PMUState *s = VIA_PMU(dev);
>> +    Error *err = NULL;
>>      SysBusDevice *sbd;
>> -    MOS6522State *ms;
>> -    DeviceState *d;
>>      struct tm tm;
>>  
>> +    object_property_set_bool(OBJECT(&s->mos6522_pmu), true, "realized",
>> +                             &err);
>> +    if (err) {
>> +        error_propagate(errp, err);
>> +        return;
>> +    }
>> +
>>      /* Pass IRQ from 6522 */
>> -    d = DEVICE(&s->mos6522_pmu);
>> -    ms = MOS6522(d);
>>      sbd = SYS_BUS_DEVICE(s);
>> -    sysbus_pass_irq(sbd, SYS_BUS_DEVICE(ms));
>> +    sysbus_pass_irq(sbd, SYS_BUS_DEVICE(&s->mos6522_pmu));
>>  
>>      qemu_get_timedate(&tm, 0);
>>      s->tick_offset = (uint32_t)mktimegm(&tm) + RTC_OFFSET;
> 
>