On Mon, Jun 24, 2019 at 8:33 PM Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
>
> There are multiple scenarios where the HMAT may contain information
> about proximity domains that are not currently online. Rather than fail
> to report any HMAT data just elide those offline domains.
>
> If and when those domains are later onlined they can be added to the
> HMEM reporting at that point.
>
> This was found while testing EFI_MEMORY_SP support which reserves
> "specific purpose" memory from the general allocation pool. If that
> reservation results in an empty numa-node then the node is not marked
> online leading a spurious:
>
> "acpi/hmat: Ignoring HMAT: Invalid table"
>
> ...result for HMAT parsing.
>
> Reviewed-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> ---
> drivers/acpi/numa/hmat.c | 14 +++++++++++---
> 1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c
> index 96b7d39a97c6..2c220cb7b620 100644
> --- a/drivers/acpi/numa/hmat.c
> +++ b/drivers/acpi/numa/hmat.c
> @@ -96,9 +96,6 @@ static __init void alloc_memory_target(unsigned int mem_pxm)
> {
> struct memory_target *target;
>
> - if (pxm_to_node(mem_pxm) == NUMA_NO_NODE)
> - return;
> -
> target = find_mem_target(mem_pxm);
> if (target)
> return;
> @@ -588,6 +585,17 @@ static __init void hmat_register_targets(void)
> struct memory_target *target;
>
> list_for_each_entry(target, &targets, node) {
> + int nid = pxm_to_node(target->memory_pxm);
> +
> + /*
> + * Skip offline nodes. This can happen when memory
> + * marked EFI_MEMORY_SP, "specific purpose", is applied
> + * to all the memory in a promixity domain leading to
> + * the node being marked offline / unplugged, or if
> + * memory-only "hotplug" node is offline.
> + */
> + if (nid == NUMA_NO_NODE || !node_online(nid))
> + continue;
> hmat_register_target_initiators(target);
> hmat_register_target_perf(target);
> }
>
