[RFC PATCH 1/8] arm64: numa: Introduce a memory_add_physaddr_to_nid()

[Yuquan Wang]

On Wed, May 29, 2024 at 06:12:29PM +0100, Jonathan Cameron wrote:
> From: Dan Williams <dan.j.williams at intel.com>
> 
> Based heavily on Dan William's earlier attempt to introduce this
> infrastruture for all architectures so I've kept his authorship. [1]
> 
> arm64 stores it's numa data in memblock. Add a memblock generic
> way to interrogate that data for memory_Add_physaddr_to_nid.
> 
> Cc: Mike Rapoport <rppt at linux.ibm.com>
> Cc: Jia He <justin.he at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Cc: David Hildenbrand <david at redhat.com>
> Cc: Andrew Morton <akpm at linux-foundation.org>
> Signed-off-by: Dan Williams <dan.j.williams at intel.com>
> Link: https://lore.kernel.org/r/159457120334.754248.12908401960465408733.stgit@dwillia2-desk3.amr.corp.intel.com [1]
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron at huawei.com>
> ---
>  arch/arm64/include/asm/sparsemem.h |  4 ++++
>  arch/arm64/mm/init.c               | 29 +++++++++++++++++++++++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/sparsemem.h b/arch/arm64/include/asm/sparsemem.h
> index 8a8acc220371..8dd1b6a718fa 100644
> --- a/arch/arm64/include/asm/sparsemem.h
> +++ b/arch/arm64/include/asm/sparsemem.h
> @@ -26,4 +26,8 @@
>  #define SECTION_SIZE_BITS 27
>  #endif /* CONFIG_ARM64_64K_PAGES */
>  
> +#ifndef __ASSEMBLY__
> +extern int memory_add_physaddr_to_nid(u64 addr);
> +#define memory_add_physaddr_to_nid memory_add_physaddr_to_nid
> +#endif /* __ASSEMBLY__ */
>  #endif
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 9b5ab6818f7f..f310cbd349ba 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -48,6 +48,35 @@
>  #include <asm/alternative.h>
>  #include <asm/xen/swiotlb-xen.h>
>  
> +#ifdef CONFIG_NUMA
> +
> +static int __memory_add_physaddr_to_nid(u64 addr)
> +{
> +	unsigned long start_pfn, end_pfn, pfn = PHYS_PFN(addr);
> +	int nid;
> +
> +	for_each_online_node(nid) {
> +		get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
> +		if (pfn >= start_pfn && pfn <= end_pfn)
> +			return nid;
> +	}
> +	return NUMA_NO_NODE;
> +}
> +
> +int memory_add_physaddr_to_nid(u64 start)
> +{
> +	int nid = __memory_add_physaddr_to_nid(start);
> +
> +	/* Default to node0 as not all callers are prepared for this to fail */
> +	if (nid == NUMA_NO_NODE)
> +		return 0;
> +
> +	return nid;
> +}
> +EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
> +
> +#endif /* CONFIG_NUMA */
> +
>  /*
>   * We need to be able to catch inadvertent references to memstart_addr
>   * that occur (potentially in generic code) before arm64_memblock_init()
> -- 
> 2.39.2
>

Tested-off-by: Yuquan Wang <wangyuquan1236 at phytium.com.cn>