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HMAT: Skip publishing target info for nodes with no online memory

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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@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dan Williams 2019-08-05 08:27:06 -06:00 committed by Rafael J. Wysocki
parent b630f62bc5
commit 5c7ed43854
1 changed files with 10 additions and 4 deletions
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14
drivers/acpi/hmat/hmat.c
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@ -108,9 +108,6 @@ 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;
@ -618,7 +615,16 @@ static void hmat_register_target_perf(struct memory_target *target)
static void hmat_register_target(struct memory_target *target)
{
if (!node_online(pxm_to_node(target->memory_pxm)))
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))
return;
mutex_lock(&target_lock);