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Date: Mon, 30 Jan 2017 09:05:55 +0530 From: Anshuman Khandual <khandual@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org, linux-mm@...ck.org Cc: mhocko@...e.com, vbabka@...e.cz, mgorman@...e.de, minchan@...nel.org, aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com, srikar@...ux.vnet.ibm.com, haren@...ux.vnet.ibm.com, jglisse@...hat.com, dave.hansen@...el.com, dan.j.williams@...el.com Subject: [DEBUG 14/21] powerpc/mm: Create numa nodes for hotplug memory From: Reza Arbab <arbab@...ux.vnet.ibm.com> When scanning the device tree to initialize the system NUMA topology, process dt elements with compatible id "ibm,hotplug-aperture" to create memoryless numa nodes. These nodes will be filled when hotplug occurs within the associated address range. Signed-off-by: Reza Arbab <arbab@...ux.vnet.ibm.com> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com> --- .../bindings/powerpc/opal/hotplug-aperture.txt | 26 ++++++++++++++++++++++ arch/powerpc/mm/numa.c | 10 +++++++-- 2 files changed, 34 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/powerpc/opal/hotplug-aperture.txt diff --git a/Documentation/devicetree/bindings/powerpc/opal/hotplug-aperture.txt b/Documentation/devicetree/bindings/powerpc/opal/hotplug-aperture.txt new file mode 100644 index 0000000..b8dffaa --- /dev/null +++ b/Documentation/devicetree/bindings/powerpc/opal/hotplug-aperture.txt @@ -0,0 +1,26 @@ +Designated hotplug memory +------------------------- + +This binding describes a region of hotplug memory which is not present at boot, +allowing its eventual NUMA associativity to be prespecified. + +Required properties: + +- compatible + "ibm,hotplug-aperture" + +- reg + base address and size of the region (standard definition) + +- ibm,associativity + NUMA associativity (standard definition) + +Example: + +A 2 GiB aperture at 0x100000000, to be part of nid 3 when hotplugged: + + hotplug-memory@...000000 { + compatible = "ibm,hotplug-aperture"; + reg = <0x0 0x100000000 0x0 0x80000000>; + ibm,associativity = <0x4 0x0 0x0 0x0 0x3>; + }; diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index 6def078..5370833 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -717,6 +717,12 @@ static void __init parse_drconf_memory(struct device_node *memory) } } +static const struct of_device_id memory_match[] = { + { .type = "memory" }, + { .compatible = "ibm,hotplug-aperture" }, + { /* sentinel */ } +}; + static int __init parse_numa_properties(void) { struct device_node *memory; @@ -761,7 +767,7 @@ static int __init parse_numa_properties(void) get_n_mem_cells(&n_mem_addr_cells, &n_mem_size_cells); - for_each_node_by_type(memory, "memory") { + for_each_matching_node(memory, memory_match) { unsigned long start; unsigned long size; int nid; @@ -1056,7 +1062,7 @@ static int hot_add_node_scn_to_nid(unsigned long scn_addr) struct device_node *memory; int nid = -1; - for_each_node_by_type(memory, "memory") { + for_each_matching_node(memory, memory_match) { unsigned long start, size; int ranges; const __be32 *memcell_buf; -- 2.9.3
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