[V5,2/4] arm64: Support Generic Initiator only domains
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Message ID 20191004114330.104746-3-Jonathan.Cameron@huawei.com
State Deferred, archived
Headers show
Series
  • ACPI: Support Generic Initiator proximity domains
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Commit Message

Jonathan Cameron Oct. 4, 2019, 11:43 a.m. UTC
The one thing that currently needs doing from an architecture
point of view is associating the GI domain with its nearest
memory domain.  This allows all the standard NUMA aware code
to get a 'reasonable' answer.

A clever driver might elect to do load balancing etc
if there are multiple host / memory domains nearby, but
that's a decision for the driver.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 arch/arm64/kernel/smp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

Patch
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diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index dc9fe879c279..fd7f6b1cdc84 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -713,6 +713,7 @@  void __init smp_prepare_cpus(unsigned int max_cpus)
 {
 	int err;
 	unsigned int cpu;
+	unsigned int node;
 	unsigned int this_cpu;
 
 	init_cpu_topology();
@@ -751,6 +752,13 @@  void __init smp_prepare_cpus(unsigned int max_cpus)
 		set_cpu_present(cpu, true);
 		numa_store_cpu_info(cpu);
 	}
+
+	/*
+	 * Walk the numa domains and set the node to numa memory reference
+	 * for any that are Generic Initiator Only.
+	 */
+	for_each_node_state(node, N_GENERIC_INITIATOR)
+		set_gi_numa_mem(node, local_memory_node(node));
 }
 
 void (*__smp_cross_call)(const struct cpumask *, unsigned int);