Re: [PATCH 3/3] ppc/pnv: Fix PEC lookup function for POWER10

["Cédric Le Goater" <clg@kaod.org>]

On 3/10/22 16:51, Frederic Barrat wrote:
> The PEC array used when looking for the PEC hosting a PHB is stored in
> the chip structure. The array is at a different offset in Pnv9Chip and
> Pnv10Chip. The lookup function was therefore not working properly on
> POWER10.
> This patch fixes it by introducing a class method to get the correct
> PEC pointer based on the chip object and PEC index.
> 
> Fixes: 623575e16cd5 ("ppc/pnv: Add model for POWER10 PHB5 PCIe Host bridge")
> Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
> ---
>   hw/pci-host/pnv_phb4.c |  5 ++---
>   hw/ppc/pnv.c           | 14 ++++++++++++++
>   include/hw/ppc/pnv.h   |  1 +
>   3 files changed, 17 insertions(+), 3 deletions(-)



Reviewed-by: Cédric Le Goater <clg@kaod.org>

Queued for 7.0.

Thanks,

C.



> diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c
> index d1a911f988..4732633833 100644
> --- a/hw/pci-host/pnv_phb4.c
> +++ b/hw/pci-host/pnv_phb4.c
> @@ -1548,7 +1548,6 @@ static void pnv_phb4_instance_init(Object *obj)
>   static PnvPhb4PecState *pnv_phb4_get_pec(PnvChip *chip, PnvPHB4 *phb,
>                                            Error **errp)
>   {
> -    Pnv9Chip *chip9 = PNV9_CHIP(chip);
>       int chip_id = phb->chip_id;
>       int index = phb->phb_id;
>       int i, j;
> @@ -1556,9 +1555,9 @@ static PnvPhb4PecState *pnv_phb4_get_pec(PnvChip *chip, PnvPHB4 *phb,
>       for (i = 0; i < chip->num_pecs; i++) {
>           /*
>            * For each PEC, check the amount of phbs it supports
> -         * and see if the given phb4 index matches an index.
> +         * and see if the given phb index matches an index.
>            */
> -        PnvPhb4PecState *pec = &chip9->pecs[i];
> +        PnvPhb4PecState *pec = PNV_CHIP_GET_CLASS(chip)->get_pec(chip, i);
>   
>           for (j = 0; j < pec->num_phbs; j++) {
>               if (index == pnv_phb4_pec_get_phb_id(pec, j)) {
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index df58403a3a..3a676cd570 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -1561,6 +1561,12 @@ static uint32_t pnv_chip_power9_xscom_pcba(PnvChip *chip, uint64_t addr)
>       return addr >> 3;
>   }
>   
> +static PnvPhb4PecState *pnv_chip_power9_get_pec(PnvChip *chip, uint32_t index)
> +{
> +    Pnv9Chip *chip9 = PNV9_CHIP(chip);
> +    return &chip9->pecs[index];
> +}
> +
>   static void pnv_chip_power9_class_init(ObjectClass *klass, void *data)
>   {
>       DeviceClass *dc = DEVICE_CLASS(klass);
> @@ -1580,6 +1586,7 @@ static void pnv_chip_power9_class_init(ObjectClass *klass, void *data)
>       k->xscom_pcba = pnv_chip_power9_xscom_pcba;
>       dc->desc = "PowerNV Chip POWER9";
>       k->num_pecs = PNV9_CHIP_MAX_PEC;
> +    k->get_pec = pnv_chip_power9_get_pec;
>   
>       device_class_set_parent_realize(dc, pnv_chip_power9_realize,
>                                       &k->parent_realize);
> @@ -1769,6 +1776,12 @@ static uint32_t pnv_chip_power10_xscom_pcba(PnvChip *chip, uint64_t addr)
>       return addr >> 3;
>   }
>   
> +static PnvPhb4PecState *pnv_chip_power10_get_pec(PnvChip *chip, uint32_t index)
> +{
> +    Pnv10Chip *chip10 = PNV10_CHIP(chip);
> +    return &chip10->pecs[index];
> +}
> +
>   static void pnv_chip_power10_class_init(ObjectClass *klass, void *data)
>   {
>       DeviceClass *dc = DEVICE_CLASS(klass);
> @@ -1788,6 +1801,7 @@ static void pnv_chip_power10_class_init(ObjectClass *klass, void *data)
>       k->xscom_pcba = pnv_chip_power10_xscom_pcba;
>       dc->desc = "PowerNV Chip POWER10";
>       k->num_pecs = PNV10_CHIP_MAX_PEC;
> +    k->get_pec = pnv_chip_power10_get_pec;
>   
>       device_class_set_parent_realize(dc, pnv_chip_power10_realize,
>                                       &k->parent_realize);
> diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
> index 1e34ddd502..282f76ba08 100644
> --- a/include/hw/ppc/pnv.h
> +++ b/include/hw/ppc/pnv.h
> @@ -163,6 +163,7 @@ struct PnvChipClass {
>       void (*pic_print_info)(PnvChip *chip, Monitor *mon);
>       uint64_t (*xscom_core_base)(PnvChip *chip, uint32_t core_id);
>       uint32_t (*xscom_pcba)(PnvChip *chip, uint64_t addr);
> +    PnvPhb4PecState *(*get_pec)(PnvChip *chip, uint32_t index);
>   };
>   
>   #define PNV_CHIP_TYPE_SUFFIX "-" TYPE_PNV_CHIP