cxl/region: Create node access attributes for CFMWS-only NUMA nodes

A NUMA node that only backs a CXL fixed memory window and is not
enumerated by SRAT has no memory_target in the HMAT code, so
hmat_callback() exits early at find_mem_target() and never creates
the node's accessN attributes:
/sys/devices/system/node/nodeX/accessN/initiators/* stays missing.

Commit debdce20c4f2 ("cxl/region: Deal with numa nodes not enumerated
by SRAT") had the CXL region notifier call node_set_perf_attrs()
directly for such nodes, but commit 2e454fb8056d ("cxl, acpi/hmat:
Update CXL access coordinates directly instead of through HMAT")
replaced it with node_update_perf_attrs(), which only updates
attributes that already exist and thus does nothing for these nodes.

Create the attributes with node_set_perf_attrs() when the node is not
backed by a real SRAT pxm.

Tested on a QEMU CXL topology with a CFMWS window not described by
SRAT or HMAT: node1/access0/initiators/{read,write}_{bandwidth,latency}
appear with the calculated coordinates once the region's first memory
block comes online.

Fixes: 2e454fb8056d ("cxl, acpi/hmat: Update CXL access coordinates directly instead of through HMAT")
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
Reviewed-by: Gregory Price (Meta) <gourry@gourry.net>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20260917024632.1397380-1-kanie@linux.alibaba.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

0 files changed, 0 insertions, 0 deletions