Re: [Qemu-devel] [PATCH v2 05/14] spapr_pci: add get/set-power-level RTAS interfaces

[Alexey Kardashevskiy <aik@ozlabs.ru>]

On 12/06/2013 09:32 AM, Michael Roth wrote:
> From: Nathan Fontenot <nfont@linux.vnet.ibm.com>
> 
> Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
> ---
>  hw/ppc/spapr_pci.c |   22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> index 1046ec8..8df44a3 100644
> --- a/hw/ppc/spapr_pci.c
> +++ b/hw/ppc/spapr_pci.c
> @@ -488,6 +488,26 @@ static void rtas_set_indicator(PowerPCCPU *cpu, sPAPREnvironment *spapr,
>      rtas_st(rets, 0, RTAS_OUT_SUCCESS);
>  }
>  
> +static void rtas_set_power_level(PowerPCCPU *cpu, sPAPREnvironment *spapr,
> +                                 uint32_t token, uint32_t nargs,
> +                                 target_ulong args, uint32_t nret,
> +                                 target_ulong rets)
> +{
> +    uint32_t power_lvl = rtas_ld(args, 1);
> +    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
> +    rtas_st(rets, 1, power_lvl);
> +}
> +
> +static void rtas_get_power_level(PowerPCCPU *cpu, sPAPREnvironment *spapr,
> +                                  uint32_t token, uint32_t nargs,
> +                                  target_ulong args, uint32_t nret,
> +                                  target_ulong rets)
> +{
> +    /* return SUCCESS with a power level of 100 */
> +    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
> +    rtas_st(rets, 1, 100);
> +}
> +

The PAPR spec says that rtas_set_power_level() returns "Actual_level The
power level actually set" but rtas_get_power_level() always returns 100
(full power).

Is this inconsistency here for a reason?


>  static int pci_spapr_swizzle(int slot, int pin)
>  {
>      return (slot + pin) % PCI_NUM_PINS;
> @@ -1051,6 +1071,8 @@ void spapr_pci_rtas_init(void)
>          spapr_rtas_register("ibm,change-msi", rtas_ibm_change_msi);
>      }
>      spapr_rtas_register("set-indicator", rtas_set_indicator);
> +    spapr_rtas_register("set-power-level", rtas_set_power_level);
> +    spapr_rtas_register("get-power-level", rtas_get_power_level);
>  }
>  
>  static void spapr_pci_register_types(void)
> 


-- 
Alexey