Re: [Qemu-devel] [PATCH for-2.10 1/8] ppc/xics: add a xics_get_cpu_index_by_pir() helper

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

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On Wed, Mar 08, 2017 at 11:52:44AM +0100, Cédric Le Goater wrote:
> This helper will be used to translate the server number of the XIVE
> (which is a PIR) into an ICPState index number (which is a cpu index).
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

This seems a slightly roundabout way of doing things.  Why not just
have the vcpu_by_pir() interface, then have the XICSFabric implementor
go directly from PIR to xics server state.

> ---
>  hw/intc/xics.c        | 11 +++++++++++
>  hw/ppc/ppc.c          | 16 ++++++++++++++++
>  include/hw/ppc/xics.h |  1 +
>  target/ppc/cpu.h      | 10 ++++++++++
>  4 files changed, 38 insertions(+)
> 
> diff --git a/hw/intc/xics.c b/hw/intc/xics.c
> index e740989a1162..209e1a75ecb9 100644
> --- a/hw/intc/xics.c
> +++ b/hw/intc/xics.c
> @@ -49,6 +49,17 @@ int xics_get_cpu_index_by_dt_id(int cpu_dt_id)
>      return -1;
>  }
>  
> +int xics_get_cpu_index_by_pir(int pir)
> +{
> +    PowerPCCPU *cpu = ppc_get_vcpu_by_pir(pir);
> +
> +    if (cpu) {
> +        return cpu->parent_obj.cpu_index;
> +    }
> +
> +    return -1;
> +}
> +
>  void xics_cpu_destroy(XICSFabric *xi, PowerPCCPU *cpu)
>  {
>      CPUState *cs = CPU(cpu);
> diff --git a/hw/ppc/ppc.c b/hw/ppc/ppc.c
> index 5f93083d4a16..94bbe382a73a 100644
> --- a/hw/ppc/ppc.c
> +++ b/hw/ppc/ppc.c
> @@ -1379,6 +1379,22 @@ PowerPCCPU *ppc_get_vcpu_by_dt_id(int cpu_dt_id)
>      return NULL;
>  }
>  
> +PowerPCCPU *ppc_get_vcpu_by_pir(int pir)
> +{
> +    CPUState *cs;
> +
> +    CPU_FOREACH(cs) {
> +        PowerPCCPU *cpu = POWERPC_CPU(cs);
> +        CPUPPCState *env = &cpu->env;
> +
> +        if (env->spr_cb[SPR_PIR].default_value == pir) {
> +            return cpu;
> +        }
> +    }
> +
> +    return NULL;
> +}
> +
>  void ppc_cpu_parse_features(const char *cpu_model)
>  {
>      CPUClass *cc;
> diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
> index 9a5e715fe553..42bd24e975cb 100644
> --- a/include/hw/ppc/xics.h
> +++ b/include/hw/ppc/xics.h
> @@ -173,6 +173,7 @@ void xics_cpu_destroy(XICSFabric *xi, PowerPCCPU *cpu);
>  
>  /* Internal XICS interfaces */
>  int xics_get_cpu_index_by_dt_id(int cpu_dt_id);
> +int xics_get_cpu_index_by_pir(int pir);
>  
>  void icp_set_cppr(ICPState *icp, uint8_t cppr);
>  void icp_set_mfrr(ICPState *icp, uint8_t mfrr);
> diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
> index 7c4a1f50b38b..24a5af95cb45 100644
> --- a/target/ppc/cpu.h
> +++ b/target/ppc/cpu.h
> @@ -2518,5 +2518,15 @@ int ppc_get_vcpu_dt_id(PowerPCCPU *cpu);
>   */
>  PowerPCCPU *ppc_get_vcpu_by_dt_id(int cpu_dt_id);
>  
> +/**
> + * ppc_get_vcpu_by_pir_id:
> + * @pir: Processor Identifier Register (SPR_PIR)
> + *
> + * Searches for a CPU by @pir.
> + *
> + * Returns: a PowerPCCPU struct
> + */
> +PowerPCCPU *ppc_get_vcpu_by_pir(int pir);
> +
>  void ppc_maybe_bswap_register(CPUPPCState *env, uint8_t *mem_buf, int len);
>  #endif /* PPC_CPU_H */

-- 
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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