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Re: [PATCH v2 2/3] spapr_numa.c: create spapr_numa_initial_nvgpu_numa_id


From: David Gibson
Subject: Re: [PATCH v2 2/3] spapr_numa.c: create spapr_numa_initial_nvgpu_numa_id() helper
Date: Fri, 29 Jan 2021 11:05:57 +1100

On Thu, Jan 28, 2021 at 02:42:12PM -0300, Daniel Henrique Barboza wrote:
> We'll need to check the initial value given to spapr->gpu_numa_id when
> building the rtas DT, so put it in a helper for easier access and to
> avoid repetition.
> 
> Tested-by: C├ędric Le Goater <clg@kaod.org>
> Reviewed-by: Greg Kurz <groug@kaod.org>
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

Applied to ppc-for-6.0, thanks.

> ---
>  hw/ppc/spapr.c              | 11 +----------
>  hw/ppc/spapr_numa.c         | 14 ++++++++++++++
>  include/hw/ppc/spapr_numa.h |  1 +
>  3 files changed, 16 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 2d60c6f594..bc3fa276ff 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -2765,16 +2765,7 @@ static void spapr_machine_init(MachineState *machine)
>  
>      }
>  
> -    /*
> -     * NVLink2-connected GPU RAM needs to be placed on a separate NUMA node.
> -     * We assign a new numa ID per GPU in spapr_pci_collect_nvgpu() which is
> -     * called from vPHB reset handler so we initialize the counter here.
> -     * If no NUMA is configured from the QEMU side, we start from 1 as GPU 
> RAM
> -     * must be equally distant from any other node.
> -     * The final value of spapr->gpu_numa_id is going to be written to
> -     * max-associativity-domains in spapr_build_fdt().
> -     */
> -    spapr->gpu_numa_id = MAX(1, machine->numa_state->num_nodes);
> +    spapr->gpu_numa_id = spapr_numa_initial_nvgpu_numa_id(machine);
>  
>      /* Init numa_assoc_array */
>      spapr_numa_associativity_init(spapr, machine);
> diff --git a/hw/ppc/spapr_numa.c b/hw/ppc/spapr_numa.c
> index 261810525b..a757dd88b8 100644
> --- a/hw/ppc/spapr_numa.c
> +++ b/hw/ppc/spapr_numa.c
> @@ -46,6 +46,20 @@ static bool spapr_numa_is_symmetrical(MachineState *ms)
>      return true;
>  }
>  
> +/*
> + * NVLink2-connected GPU RAM needs to be placed on a separate NUMA node.
> + * We assign a new numa ID per GPU in spapr_pci_collect_nvgpu() which is
> + * called from vPHB reset handler so we initialize the counter here.
> + * If no NUMA is configured from the QEMU side, we start from 1 as GPU RAM
> + * must be equally distant from any other node.
> + * The final value of spapr->gpu_numa_id is going to be written to
> + * max-associativity-domains in spapr_build_fdt().
> + */
> +unsigned int spapr_numa_initial_nvgpu_numa_id(MachineState *machine)
> +{
> +    return MAX(1, machine->numa_state->num_nodes);
> +}
> +
>  /*
>   * This function will translate the user distances into
>   * what the kernel understand as possible values: 10
> diff --git a/include/hw/ppc/spapr_numa.h b/include/hw/ppc/spapr_numa.h
> index b3fd950634..6f9f02d3de 100644
> --- a/include/hw/ppc/spapr_numa.h
> +++ b/include/hw/ppc/spapr_numa.h
> @@ -31,5 +31,6 @@ int spapr_numa_fixup_cpu_dt(SpaprMachineState *spapr, void 
> *fdt,
>                              int offset, PowerPCCPU *cpu);
>  int spapr_numa_write_assoc_lookup_arrays(SpaprMachineState *spapr, void *fdt,
>                                           int offset);
> +unsigned int spapr_numa_initial_nvgpu_numa_id(MachineState *machine);
>  
>  #endif /* HW_SPAPR_NUMA_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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