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Commit 7af3a0a9 authored by Zhen Lei's avatar Zhen Lei Committed by Will Deacon
Browse files

arm64/numa: support HAVE_SETUP_PER_CPU_AREA 



To make each percpu area allocated from its local numa node. Without this
patch, all percpu areas will be allocated from the node which cpu0 belongs
to.

Signed-off-by: default avatarZhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent f11c7bac

arch/arm64/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -600,6 +600,14 @@ config USE_PERCPU_NUMA_NODE_ID 
	def_bool y

	depends on NUMA



config HAVE_SETUP_PER_CPU_AREA

	def_bool y

	depends on NUMA



config NEED_PER_CPU_EMBED_FIRST_CHUNK

	def_bool y

	depends on NUMA



source kernel/Kconfig.preempt

source kernel/Kconfig.hz

arch/arm64/mm/numa.c

+52 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/of.h>



#include <asm/acpi.h>

#include <asm/sections.h>



struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;

EXPORT_SYMBOL(node_data);
@@ -131,6 +132,57 @@ void __init early_map_cpu_to_node(unsigned int cpu, int nid) 
	cpu_to_node_map[cpu] = nid;

}



#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA

unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;

EXPORT_SYMBOL(__per_cpu_offset);



static int __init early_cpu_to_node(int cpu)

{

	return cpu_to_node_map[cpu];

}



static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)

{

	return node_distance(from, to);

}



static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,

				       size_t align)

{

	int nid = early_cpu_to_node(cpu);



	return  memblock_virt_alloc_try_nid(size, align,

			__pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);

}



static void __init pcpu_fc_free(void *ptr, size_t size)

{

	memblock_free_early(__pa(ptr), size);

}



void __init setup_per_cpu_areas(void)

{

	unsigned long delta;

	unsigned int cpu;

	int rc;



	/*

	 * Always reserve area for module percpu variables.  That's

	 * what the legacy allocator did.

	 */

	rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,

				    PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,

				    pcpu_cpu_distance,

				    pcpu_fc_alloc, pcpu_fc_free);

	if (rc < 0)

		panic("Failed to initialize percpu areas.");



	delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;

	for_each_possible_cpu(cpu)

		__per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];

}

#endif



/**

 * numa_add_memblk - Set node id to memblk

 * @nid: NUMA node ID of the new memblk