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 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.


>  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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