On Fri, Aug 01, 2025 at 06:20:27PM +0100, shiju.jose@xxxxxxxxxx wrote:
> From: Shiju Jose <shiju.jose@xxxxxxxxxx>
>
> Lookup facility to retrieve memory phys lowest continuous range for
> a NUMA node is required in the numa_memblks for the ACPI RAS2 memory
> scrub use case.
If the code that needs to find the lowest contiguous range in a node runs
before we discard .init you can just use
unsigned long pfn = node_start_pfn(nid);
unsigned long start_pfn, end_pfn;
memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn);
> Suggested-by: Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>
> Signed-off-by: Shiju Jose <shiju.jose@xxxxxxxxxx>
> ---
> include/linux/numa.h | 10 ++++++++++
> include/linux/numa_memblks.h | 2 ++
> mm/numa.c | 10 ++++++++++
> mm/numa_memblks.c | 23 +++++++++++++++++++++++
> 4 files changed, 45 insertions(+)
>
> diff --git a/include/linux/numa.h b/include/linux/numa.h
> index e6baaf6051bc..d41e583a902d 100644
> --- a/include/linux/numa.h
> +++ b/include/linux/numa.h
> @@ -41,6 +41,10 @@ int memory_add_physaddr_to_nid(u64 start);
> int phys_to_target_node(u64 start);
> #endif
>
> +#ifndef node_to_phys_lowest_continuous_range
> +int node_to_phys_lowest_continuous_range(int nid, u64 *start, u64 *end);
> +#endif
> +
> int numa_fill_memblks(u64 start, u64 end);
>
> #else /* !CONFIG_NUMA */
> @@ -63,6 +67,12 @@ static inline int phys_to_target_node(u64 start)
> return 0;
> }
>
> +static inline int node_to_phys_lowest_continuous_range(int nid, u64 *start,
> + u64 *end)
> +{
> + return 0;
> +}
> +
> static inline void alloc_offline_node_data(int nid) {}
> #endif
>
> diff --git a/include/linux/numa_memblks.h b/include/linux/numa_memblks.h
> index 991076cba7c5..ccc53029de8b 100644
> --- a/include/linux/numa_memblks.h
> +++ b/include/linux/numa_memblks.h
> @@ -55,6 +55,8 @@ extern int phys_to_target_node(u64 start);
> #define phys_to_target_node phys_to_target_node
> extern int memory_add_physaddr_to_nid(u64 start);
> #define memory_add_physaddr_to_nid memory_add_physaddr_to_nid
> +extern int node_to_phys_lowest_continuous_range(int nid, u64 *start, u64 *end);
> +#define node_to_phys_lowest_continuous_range node_to_phys_lowest_continuous_range
> #endif /* CONFIG_NUMA_KEEP_MEMINFO */
>
> #endif /* CONFIG_NUMA_MEMBLKS */
> diff --git a/mm/numa.c b/mm/numa.c
> index 7d5e06fe5bd4..0affb56ef4f2 100644
> --- a/mm/numa.c
> +++ b/mm/numa.c
> @@ -59,3 +59,13 @@ int phys_to_target_node(u64 start)
> }
> EXPORT_SYMBOL_GPL(phys_to_target_node);
> #endif
> +
> +#ifndef node_to_phys_lowest_continuous_range
> +int node_to_phys_lowest_continuous_range(int nid, u64 *start, u64 *end)
> +{
> + pr_info_once("Unknown target phys addr range for node=%d\n", nid);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(node_to_phys_lowest_continuous_range);
> +#endif
> diff --git a/mm/numa_memblks.c b/mm/numa_memblks.c
> index 541a99c4071a..9cbaa38cb92d 100644
> --- a/mm/numa_memblks.c
> +++ b/mm/numa_memblks.c
> @@ -590,4 +590,27 @@ int memory_add_physaddr_to_nid(u64 start)
> }
> EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
>
> +static int nid_to_meminfo(struct numa_meminfo *mi, int nid, u64 *start, u64 *end)
> +{
> + int i;
> +
> + if (!numa_valid_node(nid))
> + return -EINVAL;
> +
> + for (i = 0; i < mi->nr_blks; i++) {
> + if (mi->blk[i].nid == nid) {
> + *start = mi->blk[i].start;
> + *end = mi->blk[i].end;
> + return 0;
> + }
> + }
> +
> + return -ENODEV;
> +}
> +
> +int node_to_phys_lowest_continuous_range(int nid, u64 *start, u64 *end)
> +{
> + return nid_to_meminfo(&numa_meminfo, nid, start, end);
> +}
> +EXPORT_SYMBOL_GPL(node_to_phys_lowest_continuous_range);
> #endif /* CONFIG_NUMA_KEEP_MEMINFO */
> --
> 2.43.0
>
--
Sincerely yours,
Mike.
