Re: [PATCH 7/7] drm/i915: extract a _PICK2 macro

[Jani Nikula <jani.nikula@linux.intel.com>]

On Wed, 14 Jun 2017, Rodrigo Vivi <rodrigo.vivi@gmail.com> wrote:
> On Wed, Jun 14, 2017 at 8:16 AM, Ville Syrjälä
> <ville.syrjala@linux.intel.com> wrote:
>> On Tue, Jun 13, 2017 at 04:33:50PM -0300, Paulo Zanoni wrote:
>>> Do it just like we do with _PICK and _PICK3, so our code looks a
>>> little more uniform.
>>>
>>> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
>>> ---
>>>  drivers/gpu/drm/i915/i915_reg.h | 12 ++++++------
>>>  1 file changed, 6 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>>> index a97af4a..3fb7b63 100644
>>> --- a/drivers/gpu/drm/i915/i915_reg.h
>>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>>> @@ -49,13 +49,14 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>>>  }
>>>
>
> yeap, as you predicted on the cover letter here starts the name bikeshedings ;)
>
>>>  #define _PICK(__index, a, b) ((a) + (__index) * ((b) - (a)))
>
> for me this is more like a "guess" based on the gap, but specially
> I have concern about reusing the name that was for a totally different use.
> PICK before this list is a "select from a list" and after this series is
> "select base on uniform gap"
>
>>> +#define _PICK2(__index, __offsets, a) (__offsets[__index] - __offsets[0] + \
>>> +                                    (a) + dev_priv->info.display_mmio_offset)
>
> and this is a select based on common base offset.
>
>>>  #define _PICK3(__index, ...) (((const u32 []){ __VA_ARGS__ })[__index])
>
> and this is actual pick from a list
>
> also I don't like the numbers as versions of the macro...
> I'd prefer to use just in number of arguments as before.
>
> so, what about:
>
> s/PICK(/PICK_GAP
> s/PICK2/PICK_OFFSET
> s/PICK3/PICK_LIST

Just _LINEAR, _ARRAY, _PICK.

Or PICK_LINEAR, PICK_ARRAY, PICK_VA (or PICK_ARGS).

BR,
Jani.


>
> ?
>
> or
>
> s/PICK(/SELECT_GAP
> s/PICK2/SELECT_OFFSET
> s/PICK3/SELECT_LIST
>
> ?
>
>>>
>>>  #define _PIPE(pipe, a, b) _PICK(pipe, a, b)
>>>  #define _MMIO_PIPE(pipe, a, b) _MMIO(_PIPE(pipe, a, b))
>>> -#define _MMIO_PIPE2(pipe, reg) _MMIO(dev_priv->info.pipe_offsets[pipe] - \
>>> -     dev_priv->info.pipe_offsets[PIPE_A] + (reg) + \
>>> -     dev_priv->info.display_mmio_offset)
>>> +#define _MMIO_PIPE2(pipe, reg) _MMIO(_PICK2(pipe, dev_priv->info.pipe_offsets, \
>>> +                                         reg))
>>>  #define _MMIO_PIPE3(pipe, ...) _MMIO(_PICK3(pipe, __VA_ARGS__))
>>>
>>>  #define _PLANE(plane, a, b) _PICK(plane, a, b)
>>> @@ -63,9 +64,8 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>>>
>>>  #define _TRANS(tran, a, b) _PICK(tran, a, b)
>>>  #define _MMIO_TRANS(tran, a, b) _MMIO(_TRANS(tran, a, b))
>>> -#define _MMIO_TRANS2(pipe, reg) _MMIO(dev_priv->info.trans_offsets[(pipe)] - \
>>> -     dev_priv->info.trans_offsets[TRANSCODER_A] + (reg) + \
>>> -     dev_priv->info.display_mmio_offset)
>>> +#define _MMIO_TRANS2(tran, reg) _MMIO(_PICK2(tran, \
>>> +                                          dev_priv->info.trans_offsets, reg))
>>
>> No love for cursor/palette offsets?
>>
>>>
>>>  #define _PORT(port, a, b) _PICK(port, a, b)
>>>  #define _MMIO_PORT(port, a, b) _MMIO(_PORT(port, a, b))
>>> --
>>> 2.9.4
>>>
>>> _______________________________________________
>>> Intel-gfx mailing list
>>> Intel-gfx@lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>>
>> --
>> Ville Syrjälä
>> Intel OTC
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Jani Nikula, Intel Open Source Technology Center
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