[Intel-gfx] [PATCH igt] tools/intel_reg: Add reading and writing registers through engine

[Mika Kuoppala]

Jani Nikula <jani.nikula at intel.com> writes:

> On Mon, 22 Jan 2018, Mika Kuoppala <mika.kuoppala at linux.intel.com> wrote:
>> Jani Nikula <jani.nikula at intel.com> writes:
>>
>>> On Mon, 08 Jan 2018, Mika Kuoppala <mika.kuoppala at linux.intel.com> wrote:
>>>> Add option to specify engine for register read/write operation.
>>>> If engine is specified, use MI_LOAD_REGISTER_IMM and MI_STORE_REGISTER_IMM
>>>> to write and read register using a batch targeted at that engine.
>>>
>>> Copy-pasting from the man page, we already have the notation:
>>>
>>> "Registers are defined as [(PORTNAME|PORTNUM|MMIO-OFFSET):](REGNAME|REGADDR)."
>>>
>>> Why don't we add this as ENGINE:REGNAME or something instead of an extra
>>> --engine parameter? As a "port". Sure, it's more work, but I really like
>>> the current possibility of reading all types of registers at once. Now
>>> you prevent dumps that would contain both mmio and batch based reads.
>>>
>>
>> Are you ok with the latest version? As discussed in irc, there are
>> problems with trying to add engines as ports, due to dynamic nature
>> and also that the existing infra relies on PORTNAME being mmio
>> for symbolic register dumping to work correctly.
>>
>> for the wart of if (reg->engine) in read/write paths
>> we gain the benefits of mmio dumps with engines.
>
> Can't say I would've reviewed all the engine bits and pieces, but
>
> Acked-by: Jani Nikula <jani.nikula at intel.com>

Thanks for ack and review. Pushed.
-Mika