[igt-dev] [PATCH i-g-t 3/3] lib/intel_mmio: Remove global igt_global_mmio

[Mrzyglod, Daniel T]

On Thu, 2019-04-04 at 16:47 +0200, Katarzyna Dec wrote:
> On Thu, Apr 04, 2019 at 03:18:05PM +0200, Daniel Mrzyglod wrote:
> > In future tests there will be multiple PCI devices run at once.
> > It's good for them to have different mmio space.
> > 
> > Signed-off-by: Daniel Mrzyglod <daniel.t.mrzyglod at intel.com>
> > ---
<CUT>
> > diff --git a/lib/intel_iosf.c b/lib/intel_iosf.c
> > index 3b5a1370..52a885f5 100644
> > --- a/lib/intel_iosf.c
> > +++ b/lib/intel_iosf.c
> > @@ -19,8 +19,8 @@
> >  /* Private register write, double-word addressing, non-posted */
> >  #define SB_CRWRDA_NP   0x07
> >  
> > -static int vlv_sideband_rw(uint32_t port, uint8_t opcode, uint32_t
> > addr,
> > -			   uint32_t *val)
> > +static int vlv_sideband_rw(struct mmio_data *mmio_data, uint32_t
> > port,
> > +			   uint8_t opcode, uint32_t addr, uint32_t
> > *val)
> As I undestand VLV is quite an old gen, do we need to add mmio_data
> here? Or not
> adding it breaks some compatibility?
> 
> nit: patch is almost 3000 lines of different changes, please divide
> it in
> smaller chunks. It is hard to read so large changes and yet we need
> to
> understand what is going on :/
> Kasia

The problem is that igt_global_mmio is using by VLV also and almost all
functions in intel_io.h

Design that was chosen was perfect for single device for now there are
many challenges for us and that there will be in many future scenarios:
- For example we will run competition card and ours - run some 	scenari
os
- Run our integrated and our future PCI card
- Put few different models PCI cards to limit CI cost.
- other more real scenarios

When I moved igt_global_mmio there was a need to update everything
that  was using that global pointer. 

There were few Tools that required more changes that were using
INREG/OUTREG directly.... i think intel_audio.c was a leader in diff :>

It's used by tools/tests/benchmarks others... but if i divide this
patch it will probably not compile... so it will not meet acceptance
criteria.

There is a need for v2 so i will try to adress those problems. 

Daniel
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