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Date: Mon, 18 Sep 2017 13:28:33 -0500 From: Michael Bringmann <mwb@...ux.vnet.ibm.com> To: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org Cc: Michael Ellerman <mpe@...erman.id.au>, Michael Bringmann <mwb@...ux.vnet.ibm.com>, John Allen <jallen@...ux.vnet.ibm.com>, Nathan Fontenot <nfont@...ux.vnet.ibm.com> Subject: [PATCH 1/2] powerpc/nodes: Ensure enough nodes avail for operations powerpc/nodes: On systems like PowerPC which allow 'hot-add' of CPU or memory resources, it may occur that the new resources are to be inserted into nodes that were not used for these resources at bootup. In the kernel, any node that is used must be defined and initialized at boot. This patch extracts the value of the lowest domain level (number of allocable resources) from the "rtas" device tree property "ibm,current-associativity-domains" or the device tree property "ibm,max-associativity-domains" to use as the maximum number of nodes to setup as possibly available in the system. This new setting will override the instruction, nodes_and(node_possible_map, node_possible_map, node_online_map); presently seen in the function arch/powerpc/mm/numa.c:initmem_init(). If the property is not present at boot, no operation will be performed to define or enable additional nodes. Signed-off-by: Michael Bringmann <mwb@...ux.vnet.ibm.com> --- arch/powerpc/mm/numa.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index ec098b3..b385cd0 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -892,6 +892,51 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) NODE_DATA(nid)->node_spanned_pages = spanned_pages; } +static void __init node_associativity_setup(void) +{ + struct device_node *rtas; + + rtas = of_find_node_by_path("/rtas"); + if (rtas) { + const __be32 *prop; + u32 len, entries, numnodes, i; + + prop = of_get_property(rtas, + "ibm,current-associativity-domains", &len); + if (!prop || len < sizeof(unsigned int)) { + prop = of_get_property(rtas, + "ibm,max-associativity-domains", &len); + goto endit; + } + + entries = of_read_number(prop++, 1); + + if (len < (entries * sizeof(unsigned int))) + goto endit; + + if ((0 <= min_common_depth) && (min_common_depth <= (entries-1))) + entries = min_common_depth; + else + entries -= 1; + + numnodes = of_read_number(&prop[entries], 1); + + printk(KERN_INFO "numa: Nodes = %d (mcd = %d)\n", numnodes, + min_common_depth); + + for (i = 0; i < numnodes; i++) { + if (!node_possible(i)) { + setup_node_data(i, 0, 0); + node_set(i, node_possible_map); + } + } + } + +endit: + if (rtas) + of_node_put(rtas); +} + void __init initmem_init(void) { int nid, cpu; @@ -911,6 +956,8 @@ void __init initmem_init(void) */ nodes_and(node_possible_map, node_possible_map, node_online_map); + node_associativity_setup(); + for_each_online_node(nid) { unsigned long start_pfn, end_pfn;
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