Re: [PATCH 01/19] target/microblaze: Rename CPU endianness property as 'little-endian'

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Hi Edgar,

On 5/11/24 23:54, Edgar E. Iglesias wrote:
> On Tue, Nov 05, 2024 at 02:04:13PM +0100, Philippe Mathieu-Daudé wrote:
>> Rename the 'endian' property as 'little-endian' because the 'ENDI'
>> bit is set when the endianness is in little order, and unset in
>> big order.
> 
> Hi Phil,
> 
> Unfortunately, these properties are not only QEMU internal these got named
> from the bindings Xilinx choose way back in time.
> 
> This will likely break many of the Xilinx flows with automatic dts to
> qemu property conversions so I don't think it's a good idea to rename it.
> If you like to clarify things perhaps we could keep an alias for the old
> one?

Adding an alias is the safest way, I'll respin this patch.

Note however I'm worried about this fragile disconnect between Xilinx
dts conversion which isn't exercised on mainstream (in particular if
you get busy and can't review).

> 
> For example:
> https://github.com/torvalds/linux/blob/master/arch/microblaze/boot/dts/system.dts#L73
> 
> Cheers,
> Edgar
> 
> 
>>
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>> ---
>>   hw/microblaze/petalogix_ml605_mmu.c | 2 +-
>>   hw/microblaze/xlnx-zynqmp-pmu.c     | 2 +-
>>   target/microblaze/cpu.c             | 2 +-
>>   3 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/hw/microblaze/petalogix_ml605_mmu.c b/hw/microblaze/petalogix_ml605_mmu.c
>> index b4183c5267d..df808ac323e 100644
>> --- a/hw/microblaze/petalogix_ml605_mmu.c
>> +++ b/hw/microblaze/petalogix_ml605_mmu.c
>> @@ -90,7 +90,7 @@ petalogix_ml605_init(MachineState *machine)
>>       object_property_set_int(OBJECT(cpu), "use-fpu", 1, &error_abort);
>>       object_property_set_bool(OBJECT(cpu), "dcache-writeback", true,
>>                                &error_abort);
>> -    object_property_set_bool(OBJECT(cpu), "endianness", true, &error_abort);
>> +    object_property_set_bool(OBJECT(cpu), "little-endian", true, &error_abort);
>>       qdev_realize(DEVICE(cpu), NULL, &error_abort);
>>   
>>       /* Attach emulated BRAM through the LMB.  */
>> diff --git a/hw/microblaze/xlnx-zynqmp-pmu.c b/hw/microblaze/xlnx-zynqmp-pmu.c
>> index 1bfc9641d29..43608c2dca4 100644
>> --- a/hw/microblaze/xlnx-zynqmp-pmu.c
>> +++ b/hw/microblaze/xlnx-zynqmp-pmu.c
>> @@ -90,7 +90,7 @@ static void xlnx_zynqmp_pmu_soc_realize(DeviceState *dev, Error **errp)
>>       object_property_set_bool(OBJECT(&s->cpu), "use-pcmp-instr", true,
>>                                &error_abort);
>>       object_property_set_bool(OBJECT(&s->cpu), "use-mmu", false, &error_abort);
>> -    object_property_set_bool(OBJECT(&s->cpu), "endianness", true,
>> +    object_property_set_bool(OBJECT(&s->cpu), "little-endian", true,
>>                                &error_abort);
>>       object_property_set_str(OBJECT(&s->cpu), "version", "8.40.b",
>>                               &error_abort);
>> diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c
>> index 135947ee800..e9f98806274 100644
>> --- a/target/microblaze/cpu.c
>> +++ b/target/microblaze/cpu.c
>> @@ -368,7 +368,7 @@ static Property mb_properties[] = {
>>       DEFINE_PROP_UINT8("use-non-secure", MicroBlazeCPU, cfg.use_non_secure, 0),
>>       DEFINE_PROP_BOOL("dcache-writeback", MicroBlazeCPU, cfg.dcache_writeback,
>>                        false),
>> -    DEFINE_PROP_BOOL("endianness", MicroBlazeCPU, cfg.endi, false),
>> +    DEFINE_PROP_BOOL("little-endian", MicroBlazeCPU, cfg.endi, false),
>>       /* Enables bus exceptions on failed data accesses (load/stores).  */
>>       DEFINE_PROP_BOOL("dopb-bus-exception", MicroBlazeCPU,
>>                        cfg.dopb_bus_exception, false),
>> -- 
>> 2.45.2
>>