linux-kernel - Re: [PATCH 3/3] powerpc/powernv: Introduce address translation services for Nvlink2

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Date:   Fri, 24 Mar 2017 23:28:32 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Alistair Popple <alistair@...ple.id.au>
Cc:     robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        mhairgrove@...dia.com, shailendras@...dia.com,
        Alistair Popple <alistair@...ple.id.au>
Subject: Re: [PATCH 3/3] powerpc/powernv: Introduce address translation services for Nvlink2

Alistair Popple <alistair@...ple.id.au> writes:

> diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/asm/tlb.h
> index 6095575..fc61fca 100644
> --- a/arch/powerpc/include/asm/tlb.h
> +++ b/arch/powerpc/include/asm/tlb.h
> @@ -63,15 +63,21 @@ static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
>  }
>  
>  #ifdef CONFIG_SMP
> +/* If there is an NPU context associated with this thread it may have
> + * been active on a GPU which has issued translation requests via the
> + * nest mmu. In this case we need to do a broadcast tlb to invalidate
> + * any caches on the nest mmu. Invalidations on the GPU are handled
> + * via mmu notfiers.
> + */
>  static inline int mm_is_core_local(struct mm_struct *mm)
>  {
> -	return cpumask_subset(mm_cpumask(mm),
> +	return !mm->context.npu_context && cpumask_subset(mm_cpumask(mm),
>  			      topology_sibling_cpumask(smp_processor_id()));
>  }

This breaks the BookE build (corenet64_smp_defconfig):

23:22:58 In file included from arch/powerpc/mm/pgtable-book3e.c:15:0:
23:22:58 ./arch/powerpc/include/asm/tlb.h: In function 'mm_is_core_local':
23:22:58 ./arch/powerpc/include/asm/tlb.h:75:21: error: 'mm_context_t {aka struct <anonymous>}' has no member named 'npu_context'
23:22:58   return !mm->context.npu_context && cpumask_subset(mm_cpumask(mm),
23:22:58                      ^

cheers