diff options
| author | Nilay Shroff <nilay@linux.ibm.com> | 2024-05-17 19:55:23 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2024-06-04 17:13:55 +1000 |
| commit | 11981816e3614156a1fe14a1e8e77094ea46c7d5 (patch) | |
| tree | 76ee5c45305cabbfb99c7ff598fef1cf10959416 /arch/powerpc/mm | |
| parent | ff5163bb7000a0254ffdd7b50cb6df43add94f33 (diff) | |
powerpc/numa: Online a node if PHB is attached.
In the current design, a numa-node is made online only if that node is
attached to cpu/memory. With this design, if any PCI/IO device is found
to be attached to a numa-node which is not online then the numa-node
id of the corresponding PCI/IO device is set to NUMA_NO_NODE(-1). This
design may negatively impact the performance of PCIe device if the
numa-node assigned to PCIe device is -1 because in such case we may not
be able to accurately calculate the distance between two nodes.
The multi-controller NVMe PCIe disk has an issue with calculating the
node distance if the PCIe NVMe controller is attached to a PCI host
bridge which has numa-node id value set to NUMA_NO_NODE. This patch
helps fix this ensuring that a cpu/memory less numa node is made online
if it's attached to PCI host bridge.
Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Srikar Dronamraju <srikar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240517142531.3273464-3-nilay@linux.ibm.com
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/numa.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index a490724e84ad..aa89899f0c1a 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -896,7 +896,7 @@ static int __init numa_setup_drmem_lmb(struct drmem_lmb *lmb, static int __init parse_numa_properties(void) { - struct device_node *memory; + struct device_node *memory, *pci; int default_nid = 0; unsigned long i; const __be32 *associativity; @@ -1010,6 +1010,18 @@ new_range: goto new_range; } + for_each_node_by_name(pci, "pci") { + int nid = NUMA_NO_NODE; + + associativity = of_get_associativity(pci); + if (associativity) { + nid = associativity_to_nid(associativity); + initialize_form1_numa_distance(associativity); + } + if (likely(nid >= 0) && !node_online(nid)) + node_set_online(nid); + } + /* * Now do the same thing for each MEMBLOCK listed in the * ibm,dynamic-memory property in the |