Re: [PATCH 2/5] hw/ppc/pnv_xscom: PBA bar mask values are incorrect with homer/occ sizes

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, Nov 20, 2019 at 08:56:18AM +1100, David Gibson wrote:
> On Tue, Nov 19, 2019 at 11:20:53PM +0530, Balamuruhan S wrote:
> > homer/occ sizes are calculated in skiboot with `(mask | 0xfffff) + 1`,
> > and from xscom access should return correct mask values instead of actual
> > sizes.
> > 
> > Signed-off-by: Cédric Le Goater <clg@kaod.org>
> > Signed-off-by: Balamuruhan S <bala24@linux.ibm.com>
> > ---
> >  hw/ppc/pnv_xscom.c | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> > 
> > diff --git a/hw/ppc/pnv_xscom.c b/hw/ppc/pnv_xscom.c
> > index f01d788a65..cdd5fa356e 100644
> > --- a/hw/ppc/pnv_xscom.c
> > +++ b/hw/ppc/pnv_xscom.c
> > @@ -46,6 +46,10 @@
> >  #define P9_PBA_BARMASK0                 0x5012b04
> >  #define P9_PBA_BARMASK2                 0x5012b06
> >  
> > +/* Mask to calculate Homer/Occ size */
> > +#define HOMER_SIZE_MASK                 0x0000000000300000ull
> > +#define OCC_SIZE_MASK                   0x0000000000700000ull
> 
> Uuuhhhhh... AFAICT these defines have identical values to
> PNV_HOMER_SIZE and PNV_OCC_COMMON_AREA_SIZE, so I don't see what this
> patch is actually changing.

Oh, sorry, missed that the values were changed in 1/5.  Would have
been easier to follow if the two patches were folded together, but
never mind.  Applied.

> 
> 
> >  static void xscom_complete(CPUState *cs, uint64_t hmer_bits)
> >  {
> >      /*
> > @@ -90,9 +94,8 @@ static uint64_t xscom_read_default(PnvChip *chip, uint32_t pcba)
> >          return PNV_HOMER_BASE(chip);
> >  
> >      case P9_PBA_BARMASK0: /* P9 homer region size */
> > -        return PNV9_HOMER_SIZE;
> >      case P8_PBA_BARMASK0: /* P8 homer region size */
> > -        return PNV_HOMER_SIZE;
> > +        return HOMER_SIZE_MASK;
> >  
> >      case P9_PBA_BAR2: /* P9 occ common area */
> >          return PNV9_OCC_COMMON_AREA(chip);
> > @@ -100,9 +103,8 @@ static uint64_t xscom_read_default(PnvChip *chip, uint32_t pcba)
> >          return PNV_OCC_COMMON_AREA(chip);
> >  
> >      case P9_PBA_BARMASK2: /* P9 occ common area size */
> > -        return PNV9_OCC_COMMON_AREA_SIZE;
> >      case P8_PBA_BARMASK2: /* P8 occ common area size */
> > -        return PNV_OCC_COMMON_AREA_SIZE;
> > +        return OCC_SIZE_MASK;
> >  
> >      case 0x1010c00:     /* PIBAM FIR */
> >      case 0x1010c03:     /* PIBAM FIR MASK */
> 



-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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