[PATCH v5 1/4] arm64, numa: adding numa support for arm64 platforms.
Ganapatrao Kulkarni
gpkulkarni at gmail.com
Sun Oct 4 22:24:21 PDT 2015
Hi Catalin,
can you please review this patch.
On Fri, Aug 14, 2015 at 10:09 PM, Ganapatrao Kulkarni
<gkulkarni at caviumnetworks.com> wrote:
> Adding numa support for arm64 based platforms.
> This patch adds by default the dummy numa node and
> maps all memory and cpus to node 0.
> using this patch, numa can be simulated on single node arm64 platforms.
>
> Signed-off-by: Ganapatrao Kulkarni <gkulkarni at caviumnetworks.com>
> ---
> arch/arm64/Kconfig | 26 ++
> arch/arm64/include/asm/mmzone.h | 32 +++
> arch/arm64/include/asm/numa.h | 42 +++
> arch/arm64/kernel/setup.c | 9 +
> arch/arm64/kernel/smp.c | 2 +
> arch/arm64/mm/Makefile | 1 +
> arch/arm64/mm/init.c | 34 ++-
> arch/arm64/mm/numa.c | 550 ++++++++++++++++++++++++++++++++++++++++
> 8 files changed, 690 insertions(+), 6 deletions(-)
> create mode 100644 arch/arm64/include/asm/mmzone.h
> create mode 100644 arch/arm64/include/asm/numa.h
> create mode 100644 arch/arm64/mm/numa.c
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 43a0c26..fa37a5d 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -72,6 +72,7 @@ config ARM64
> select HAVE_PERF_USER_STACK_DUMP
> select HAVE_RCU_TABLE_FREE
> select HAVE_SYSCALL_TRACEPOINTS
> + select HAVE_MEMBLOCK_NODE_MAP if NUMA
> select IRQ_DOMAIN
> select IRQ_FORCED_THREADING
> select MODULES_USE_ELF_RELA
> @@ -559,6 +560,31 @@ config HOTPLUG_CPU
> Say Y here to experiment with turning CPUs off and on. CPUs
> can be controlled through /sys/devices/system/cpu.
>
> +# Common NUMA Features
> +config NUMA
> + bool "Numa Memory Allocation and Scheduler Support"
> + depends on SMP
> + help
> + Enable NUMA (Non Uniform Memory Access) support.
> +
> + The kernel will try to allocate memory used by a CPU on the
> + local memory controller of the CPU and add some more
> + NUMA awareness to the kernel.
> +
> +config NODES_SHIFT
> + int "Maximum NUMA Nodes (as a power of 2)"
> + range 1 10
> + default "2"
> + depends on NEED_MULTIPLE_NODES
> + help
> + Specify the maximum number of NUMA Nodes available on the target
> + system. Increases memory reserved to accommodate various tables.
> +
> +config USE_PERCPU_NUMA_NODE_ID
> + def_bool y
> + depends on NUMA
> +
> +
> source kernel/Kconfig.preempt
>
> config UP_LATE_INIT
> diff --git a/arch/arm64/include/asm/mmzone.h b/arch/arm64/include/asm/mmzone.h
> new file mode 100644
> index 0000000..d27ee66
> --- /dev/null
> +++ b/arch/arm64/include/asm/mmzone.h
> @@ -0,0 +1,32 @@
> +#ifndef __ASM_ARM64_MMZONE_H_
> +#define __ASM_ARM64_MMZONE_H_
> +
> +#ifdef CONFIG_NUMA
> +
> +#include <linux/mmdebug.h>
> +#include <asm/smp.h>
> +#include <linux/types.h>
> +#include <asm/numa.h>
> +
> +extern struct pglist_data *node_data[];
> +
> +#define NODE_DATA(nid) (node_data[nid])
> +
> +
> +struct numa_memblk {
> + u64 start;
> + u64 end;
> + int nid;
> +};
> +
> +struct numa_meminfo {
> + int nr_blks;
> + struct numa_memblk blk[NR_NODE_MEMBLKS];
> +};
> +
> +void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi);
> +int __init numa_cleanup_meminfo(struct numa_meminfo *mi);
> +void __init numa_reset_distance(void);
> +
> +#endif /* CONFIG_NUMA */
> +#endif /* __ASM_ARM64_MMZONE_H_ */
> diff --git a/arch/arm64/include/asm/numa.h b/arch/arm64/include/asm/numa.h
> new file mode 100644
> index 0000000..59b834e
> --- /dev/null
> +++ b/arch/arm64/include/asm/numa.h
> @@ -0,0 +1,42 @@
> +#ifndef _ASM_NUMA_H
> +#define _ASM_NUMA_H
> +
> +#include <linux/nodemask.h>
> +#include <asm/topology.h>
> +
> +#ifdef CONFIG_NUMA
> +
> +#define NR_NODE_MEMBLKS (MAX_NUMNODES * 2)
> +#define ZONE_ALIGN (1UL << (MAX_ORDER + PAGE_SHIFT))
> +
> +/* currently, arm64 implements flat NUMA topology */
> +#define parent_node(node) (node)
> +
> +/* dummy definitions for pci functions */
> +#define pcibus_to_node(node) 0
> +#define cpumask_of_pcibus(bus) 0
> +
> +struct __node_cpu_hwid {
> + u32 node_id; /* logical node containing this CPU */
> + u64 cpu_hwid; /* MPIDR for this CPU */
> +};
> +
> +extern struct __node_cpu_hwid node_cpu_hwid[NR_CPUS];
> +extern nodemask_t numa_nodes_parsed __initdata;
> +
> +const struct cpumask *cpumask_of_node(int node);
> +/* Mappings between node number and cpus on that node. */
> +extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
> +
> +void __init arm64_numa_init(void);
> +int __init numa_add_memblk(u32 nodeid, u64 start, u64 end);
> +void numa_store_cpu_info(int cpu);
> +void __init build_cpu_to_node_map(void);
> +void __init numa_set_distance(int from, int to, int distance);
> +#else /* CONFIG_NUMA */
> +static inline void numa_store_cpu_info(int cpu) { }
> +static inline void arm64_numa_init(void) { }
> +static inline void build_cpu_to_node_map(void) { }
> +static inline void numa_set_distance(int from, int to, int distance) { }
> +#endif /* CONFIG_NUMA */
> +#endif /* _ASM_NUMA_H */
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index 4d4d7ce..6e101eb 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -65,6 +65,7 @@
> #include <asm/efi.h>
> #include <asm/virt.h>
> #include <asm/xen/hypervisor.h>
> +#include <asm/numa.h>
>
> unsigned long elf_hwcap __read_mostly;
> EXPORT_SYMBOL_GPL(elf_hwcap);
> @@ -439,6 +440,9 @@ static int __init topology_init(void)
> {
> int i;
>
> + for_each_online_node(i)
> + register_one_node(i);
> +
> for_each_possible_cpu(i) {
> struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
> cpu->hotpluggable = 1;
> @@ -511,7 +515,12 @@ static int c_show(struct seq_file *m, void *v)
> * "processor". Give glibc what it expects.
> */
> #ifdef CONFIG_SMP
> + if (IS_ENABLED(CONFIG_NUMA)) {
> + seq_printf(m, "processor\t: %d", i);
> + seq_printf(m, " [nid: %d]\n", cpu_to_node(i));
> + } else {
> seq_printf(m, "processor\t: %d\n", i);
> + }
> #endif
>
> /*
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index 50fb469..ae3e02c 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -52,6 +52,7 @@
> #include <asm/sections.h>
> #include <asm/tlbflush.h>
> #include <asm/ptrace.h>
> +#include <asm/numa.h>
>
> #define CREATE_TRACE_POINTS
> #include <trace/events/ipi.h>
> @@ -124,6 +125,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
> static void smp_store_cpu_info(unsigned int cpuid)
> {
> store_cpu_topology(cpuid);
> + numa_store_cpu_info(cpuid);
> }
>
> /*
> diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile
> index 773d37a..bb92d41 100644
> --- a/arch/arm64/mm/Makefile
> +++ b/arch/arm64/mm/Makefile
> @@ -4,3 +4,4 @@ obj-y := dma-mapping.o extable.o fault.o init.o \
> context.o proc.o pageattr.o
> obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
> obj-$(CONFIG_ARM64_PTDUMP) += dump.o
> +obj-$(CONFIG_NUMA) += numa.o
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 54da32e..cab384b 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -42,6 +42,7 @@
> #include <asm/sizes.h>
> #include <asm/tlb.h>
> #include <asm/alternative.h>
> +#include <asm/numa.h>
>
> #include "mm.h"
>
> @@ -77,6 +78,20 @@ static phys_addr_t max_zone_dma_phys(void)
> return min(offset + (1ULL << 32), memblock_end_of_DRAM());
> }
>
> +#ifdef CONFIG_NUMA
> +static void __init zone_sizes_init(unsigned long min, unsigned long max)
> +{
> + unsigned long max_zone_pfns[MAX_NR_ZONES];
> +
> + memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
> + if (IS_ENABLED(CONFIG_ZONE_DMA))
> + max_zone_pfns[ZONE_DMA] = PFN_DOWN(max_zone_dma_phys());
> + max_zone_pfns[ZONE_NORMAL] = max;
> +
> + free_area_init_nodes(max_zone_pfns);
> +}
> +
> +#else
> static void __init zone_sizes_init(unsigned long min, unsigned long max)
> {
> struct memblock_region *reg;
> @@ -115,6 +130,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
>
> free_area_init_node(0, zone_size, min, zhole_size);
> }
> +#endif /* CONFIG_NUMA */
>
> #ifdef CONFIG_HAVE_ARCH_PFN_VALID
> int pfn_valid(unsigned long pfn)
> @@ -132,10 +148,15 @@ static void arm64_memory_present(void)
> static void arm64_memory_present(void)
> {
> struct memblock_region *reg;
> + int nid = 0;
>
> - for_each_memblock(memory, reg)
> - memory_present(0, memblock_region_memory_base_pfn(reg),
> - memblock_region_memory_end_pfn(reg));
> + for_each_memblock(memory, reg) {
> +#ifdef CONFIG_NUMA
> + nid = reg->nid;
> +#endif
> + memory_present(nid, memblock_region_memory_base_pfn(reg),
> + memblock_region_memory_end_pfn(reg));
> + }
> }
> #endif
>
> @@ -200,6 +221,10 @@ void __init bootmem_init(void)
> min = PFN_UP(memblock_start_of_DRAM());
> max = PFN_DOWN(memblock_end_of_DRAM());
>
> + high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
> + max_pfn = max_low_pfn = max;
> +
> + arm64_numa_init();
> /*
> * Sparsemem tries to allocate bootmem in memory_present(), so must be
> * done after the fixed reservations.
> @@ -208,9 +233,6 @@ void __init bootmem_init(void)
>
> sparse_init();
> zone_sizes_init(min, max);
> -
> - high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
> - max_pfn = max_low_pfn = max;
> }
>
> #ifndef CONFIG_SPARSEMEM_VMEMMAP
> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
> new file mode 100644
> index 0000000..2be83de
> --- /dev/null
> +++ b/arch/arm64/mm/numa.c
> @@ -0,0 +1,550 @@
> +/*
> + * NUMA support, based on the x86 implementation.
> + *
> + * Copyright (C) 2015 Cavium Inc.
> + * Author: Ganapatrao Kulkarni <gkulkarni at cavium.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/mm.h>
> +#include <linux/string.h>
> +#include <linux/init.h>
> +#include <linux/bootmem.h>
> +#include <linux/memblock.h>
> +#include <linux/ctype.h>
> +#include <linux/module.h>
> +#include <linux/nodemask.h>
> +#include <linux/sched.h>
> +#include <linux/topology.h>
> +#include <linux/mmzone.h>
> +
> +#include <asm/smp_plat.h>
> +
> +int __initdata numa_off;
> +nodemask_t numa_nodes_parsed __initdata;
> +static int numa_distance_cnt;
> +static u8 *numa_distance;
> +static u8 dummy_numa_enabled;
> +
> +struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
> +EXPORT_SYMBOL(node_data);
> +
> +struct __node_cpu_hwid node_cpu_hwid[NR_CPUS];
> +static struct numa_meminfo numa_meminfo;
> +
> +static __init int numa_setup(char *opt)
> +{
> + if (!opt)
> + return -EINVAL;
> + if (!strncmp(opt, "off", 3)) {
> + pr_info("%s\n", "NUMA turned off");
> + numa_off = 1;
> + }
> + return 0;
> +}
> +early_param("numa", numa_setup);
> +
> +cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
> +EXPORT_SYMBOL(node_to_cpumask_map);
> +
> +int cpu_to_node_map[NR_CPUS];
> +EXPORT_SYMBOL(cpu_to_node_map);
> +
> +/*
> + * Returns a pointer to the bitmask of CPUs on Node 'node'.
> + */
> +const struct cpumask *cpumask_of_node(int node)
> +{
> + if (node >= nr_node_ids) {
> + pr_warn("cpumask_of_node(%d): node > nr_node_ids(%d)\n",
> + node, nr_node_ids);
> + dump_stack();
> + return cpu_none_mask;
> + }
> + if (node_to_cpumask_map[node] == NULL) {
> + pr_warn("cpumask_of_node(%d): no node_to_cpumask_map!\n",
> + node);
> + dump_stack();
> + return cpu_online_mask;
> + }
> + return node_to_cpumask_map[node];
> +}
> +EXPORT_SYMBOL(cpumask_of_node);
> +
> +void numa_clear_node(int cpu)
> +{
> + set_cpu_numa_node(cpu, NUMA_NO_NODE);
> +}
> +
> +void map_cpu_to_node(int cpu, int nid)
> +{
> + if (nid < 0) { /* just initialize by zero */
> + cpu_to_node_map[cpu] = 0;
> + return;
> + }
> +
> + cpu_to_node_map[cpu] = nid;
> + cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
> + set_numa_node(nid);
> +}
> +
> +/**
> + * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays
> + *
> + * Build cpu to node mapping and initialize the per node cpu masks using
> + * info from the node_cpuid array handed to us by ACPI or DT.
> + */
> +void __init build_cpu_to_node_map(void)
> +{
> + int cpu, i, node;
> +
> + for (node = 0; node < MAX_NUMNODES; node++)
> + cpumask_clear(node_to_cpumask_map[node]);
> +
> + for_each_possible_cpu(cpu) {
> + node = NUMA_NO_NODE;
> + for_each_possible_cpu(i) {
> + if (cpu_logical_map(cpu) == node_cpu_hwid[i].cpu_hwid) {
> + node = node_cpu_hwid[i].node_id;
> + break;
> + }
> + }
> + map_cpu_to_node(cpu, node);
> + }
> +}
> +/*
> + * Allocate node_to_cpumask_map based on number of available nodes
> + * Requires node_possible_map to be valid.
> + *
> + * Note: cpumask_of_node() is not valid until after this is done.
> + * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
> + */
> +void __init setup_node_to_cpumask_map(void)
> +{
> + unsigned int node;
> +
> + /* setup nr_node_ids if not done yet */
> + if (nr_node_ids == MAX_NUMNODES)
> + setup_nr_node_ids();
> +
> + /* allocate the map */
> + for (node = 0; node < nr_node_ids; node++)
> + alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
> +
> + /* cpumask_of_node() will now work */
> + pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids);
> +}
> +
> +/*
> + * Set the cpu to node and mem mapping
> + */
> +void numa_store_cpu_info(int cpu)
> +{
> + if (dummy_numa_enabled) {
> + /* set to default */
> + node_cpu_hwid[cpu].node_id = 0;
> + node_cpu_hwid[cpu].cpu_hwid = cpu_logical_map(cpu);
> + }
> + map_cpu_to_node(cpu, node_cpu_hwid[cpu].node_id);
> +}
> +
> +/**
> + * numa_add_memblk_to - Add one numa_memblk to a numa_meminfo
> + */
> +
> +static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
> + struct numa_meminfo *mi)
> +{
> + /* ignore zero length blks */
> + if (start == end)
> + return 0;
> +
> + /* whine about and ignore invalid blks */
> + if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
> + pr_warn("NUMA: Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
> + nid, start, end - 1);
> + return 0;
> + }
> +
> + if (mi->nr_blks >= NR_NODE_MEMBLKS) {
> + pr_err("NUMA: too many memblk ranges\n");
> + return -EINVAL;
> + }
> +
> + pr_info("NUMA: Adding memblock %d [0x%llx - 0x%llx] on node %d\n",
> + mi->nr_blks, start, end, nid);
> + mi->blk[mi->nr_blks].start = start;
> + mi->blk[mi->nr_blks].end = end;
> + mi->blk[mi->nr_blks].nid = nid;
> + mi->nr_blks++;
> + return 0;
> +}
> +
> +/**
> + * numa_add_memblk - Add one numa_memblk to numa_meminfo
> + * @nid: NUMA node ID of the new memblk
> + * @start: Start address of the new memblk
> + * @end: End address of the new memblk
> + *
> + * Add a new memblk to the default numa_meminfo.
> + *
> + * RETURNS:
> + * 0 on success, -errno on failure.
> + */
> +#define MAX_PHYS_ADDR ((phys_addr_t)~0)
> +
> +int __init numa_add_memblk(u32 nid, u64 base, u64 end)
> +{
> + const u64 phys_offset = __pa(PAGE_OFFSET);
> +
> + base &= PAGE_MASK;
> + end &= PAGE_MASK;
> +
> + if (base > MAX_PHYS_ADDR) {
> + pr_warn("NUMA: Ignoring memory block 0x%llx - 0x%llx\n",
> + base, base + end);
> + return -ENOMEM;
> + }
> +
> + if (base + end > MAX_PHYS_ADDR) {
> + pr_info("NUMA: Ignoring memory range 0x%lx - 0x%llx\n",
> + ULONG_MAX, base + end);
> + end = MAX_PHYS_ADDR - base;
> + }
> +
> + if (base + end < phys_offset) {
> + pr_warn("NUMA: Ignoring memory block 0x%llx - 0x%llx\n",
> + base, base + end);
> + return -ENOMEM;
> + }
> + if (base < phys_offset) {
> + pr_info("NUMA: Ignoring memory range 0x%llx - 0x%llx\n",
> + base, phys_offset);
> + end -= phys_offset - base;
> + base = phys_offset;
> + }
> +
> + return numa_add_memblk_to(nid, base, base + end, &numa_meminfo);
> +}
> +EXPORT_SYMBOL(numa_add_memblk);
> +
> +/* Initialize NODE_DATA for a node on the local memory */
> +static void __init setup_node_data(int nid, u64 start, u64 end)
> +{
> + const size_t nd_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
> + u64 nd_pa;
> + void *nd;
> + int tnid;
> +
> + start = roundup(start, ZONE_ALIGN);
> +
> + pr_info("Initmem setup node %d [mem %#010Lx-%#010Lx]\n",
> + nid, start, end - 1);
> +
> + /*
> + * Allocate node data. Try node-local memory and then any node.
> + */
> + nd_pa = memblock_alloc_nid(nd_size, SMP_CACHE_BYTES, nid);
> + if (!nd_pa) {
> + nd_pa = __memblock_alloc_base(nd_size, SMP_CACHE_BYTES,
> + MEMBLOCK_ALLOC_ACCESSIBLE);
> + if (!nd_pa) {
> + pr_err("Cannot find %zu bytes in node %d\n",
> + nd_size, nid);
> + return;
> + }
> + }
> + nd = __va(nd_pa);
> +
> + /* report and initialize */
> + pr_info(" NODE_DATA [mem %#010Lx-%#010Lx]\n",
> + nd_pa, nd_pa + nd_size - 1);
> + tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
> + if (tnid != nid)
> + pr_info(" NODE_DATA(%d) on node %d\n", nid, tnid);
> +
> + node_data[nid] = nd;
> + memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
> + NODE_DATA(nid)->node_id = nid;
> + NODE_DATA(nid)->node_start_pfn = start >> PAGE_SHIFT;
> + NODE_DATA(nid)->node_spanned_pages = (end - start) >> PAGE_SHIFT;
> +
> + node_set_online(nid);
> +}
> +
> +/*
> + * Set nodes, which have memory in @mi, in *@nodemask.
> + */
> +static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
> + const struct numa_meminfo *mi)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
> + if (mi->blk[i].start != mi->blk[i].end &&
> + mi->blk[i].nid != NUMA_NO_NODE)
> + node_set(mi->blk[i].nid, *nodemask);
> +}
> +
> +/*
> + * Sanity check to catch more bad NUMA configurations (they are amazingly
> + * common). Make sure the nodes cover all memory.
> + */
> +static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
> +{
> + u64 numaram, totalram;
> + int i;
> +
> + numaram = 0;
> + for (i = 0; i < mi->nr_blks; i++) {
> + u64 s = mi->blk[i].start >> PAGE_SHIFT;
> + u64 e = mi->blk[i].end >> PAGE_SHIFT;
> +
> + numaram += e - s;
> + numaram -= __absent_pages_in_range(mi->blk[i].nid, s, e);
> + if ((s64)numaram < 0)
> + numaram = 0;
> + }
> +
> + totalram = max_pfn - absent_pages_in_range(0, max_pfn);
> +
> + /* We seem to lose 3 pages somewhere. Allow 1M of slack. */
> + if ((s64)(totalram - numaram) >= (1 << (20 - PAGE_SHIFT))) {
> + pr_err("NUMA: nodes only cover %lluMB of your %lluMB Total RAM. Not used.\n",
> + (numaram << PAGE_SHIFT) >> 20,
> + (totalram << PAGE_SHIFT) >> 20);
> + return false;
> + }
> + return true;
> +}
> +
> +/**
> + * numa_reset_distance - Reset NUMA distance table
> + *
> + * The current table is freed. The next numa_set_distance() call will
> + * create a new one.
> + */
> +void __init numa_reset_distance(void)
> +{
> + size_t size = numa_distance_cnt * numa_distance_cnt *
> + sizeof(numa_distance[0]);
> +
> + /* numa_distance could be 1LU marking allocation failure, test cnt */
> + if (numa_distance_cnt)
> + memblock_free(__pa(numa_distance), size);
> + numa_distance_cnt = 0;
> + numa_distance = NULL; /* enable table creation */
> +}
> +
> +static int __init numa_alloc_distance(void)
> +{
> + nodemask_t nodes_parsed;
> + size_t size;
> + int i, j, cnt = 0;
> + u64 phys;
> +
> + /* size the new table and allocate it */
> + nodes_parsed = numa_nodes_parsed;
> + numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
> +
> + for_each_node_mask(i, nodes_parsed)
> + cnt = i;
> + cnt++;
> + size = cnt * cnt * sizeof(numa_distance[0]);
> +
> + phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
> + size, PAGE_SIZE);
> + if (!phys) {
> + pr_warn("NUMA: Warning: can't allocate distance table!\n");
> + /* don't retry until explicitly reset */
> + numa_distance = (void *)1LU;
> + return -ENOMEM;
> + }
> + memblock_reserve(phys, size);
> +
> + numa_distance = __va(phys);
> + numa_distance_cnt = cnt;
> +
> + /* fill with the default distances */
> + for (i = 0; i < cnt; i++)
> + for (j = 0; j < cnt; j++)
> + numa_distance[i * cnt + j] = i == j ?
> + LOCAL_DISTANCE : REMOTE_DISTANCE;
> + pr_debug("NUMA: Initialized distance table, cnt=%d\n", cnt);
> +
> + return 0;
> +}
> +
> +/**
> + * numa_set_distance - Set NUMA distance from one NUMA to another
> + * @from: the 'from' node to set distance
> + * @to: the 'to' node to set distance
> + * @distance: NUMA distance
> + *
> + * Set the distance from node @from to @to to @distance. If distance table
> + * doesn't exist, one which is large enough to accommodate all the currently
> + * known nodes will be created.
> + *
> + * If such table cannot be allocated, a warning is printed and further
> + * calls are ignored until the distance table is reset with
> + * numa_reset_distance().
> + *
> + * If @from or @to is higher than the highest known node or lower than zero
> + * at the time of table creation or @distance doesn't make sense, the call
> + * is ignored.
> + * This is to allow simplification of specific NUMA config implementations.
> + */
> +void __init numa_set_distance(int from, int to, int distance)
> +{
> + if (!numa_distance && numa_alloc_distance() < 0)
> + return;
> +
> + if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
> + from < 0 || to < 0) {
> + pr_warn_once("NUMA: Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
> + from, to, distance);
> + return;
> + }
> +
> + if ((u8)distance != distance ||
> + (from == to && distance != LOCAL_DISTANCE)) {
> + pr_warn_once("NUMA: Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
> + from, to, distance);
> + return;
> + }
> +
> + numa_distance[from * numa_distance_cnt + to] = distance;
> +}
> +EXPORT_SYMBOL(numa_set_distance);
> +
> +int __node_distance(int from, int to)
> +{
> + if (from >= numa_distance_cnt || to >= numa_distance_cnt)
> + return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
> + return numa_distance[from * numa_distance_cnt + to];
> +}
> +EXPORT_SYMBOL(__node_distance);
> +
> +static int __init numa_register_memblks(struct numa_meminfo *mi)
> +{
> + unsigned long uninitialized_var(pfn_align);
> + int i, nid;
> +
> + /* Account for nodes with cpus and no memory */
> + node_possible_map = numa_nodes_parsed;
> + numa_nodemask_from_meminfo(&node_possible_map, mi);
> + if (WARN_ON(nodes_empty(node_possible_map)))
> + return -EINVAL;
> +
> + for (i = 0; i < mi->nr_blks; i++) {
> + struct numa_memblk *mb = &mi->blk[i];
> +
> + memblock_set_node(mb->start, mb->end - mb->start,
> + &memblock.memory, mb->nid);
> + }
> +
> + /*
> + * If sections array is gonna be used for pfn -> nid mapping, check
> + * whether its granularity is fine enough.
> + */
> +#ifdef NODE_NOT_IN_PAGE_FLAGS
> + pfn_align = node_map_pfn_alignment();
> + if (pfn_align && pfn_align < PAGES_PER_SECTION) {
> + pr_warn("Node alignment %lluMB < min %lluMB, rejecting NUMA config\n",
> + PFN_PHYS(pfn_align) >> 20,
> + PFN_PHYS(PAGES_PER_SECTION) >> 20);
> + return -EINVAL;
> + }
> +#endif
> + if (!numa_meminfo_cover_memory(mi))
> + return -EINVAL;
> +
> + /* Finally register nodes. */
> + for_each_node_mask(nid, node_possible_map) {
> + u64 start = PFN_PHYS(max_pfn);
> + u64 end = 0;
> +
> + for (i = 0; i < mi->nr_blks; i++) {
> + if (nid != mi->blk[i].nid)
> + continue;
> + start = min(mi->blk[i].start, start);
> + end = max(mi->blk[i].end, end);
> + }
> +
> + if (start < end)
> + setup_node_data(nid, start, end);
> + }
> +
> + /* Dump memblock with node info and return. */
> + memblock_dump_all();
> + return 0;
> +}
> +
> +static int __init numa_init(int (*init_func)(void))
> +{
> + int ret, i;
> +
> + nodes_clear(numa_nodes_parsed);
> + nodes_clear(node_possible_map);
> + nodes_clear(node_online_map);
> +
> + ret = init_func();
> + if (ret < 0)
> + return ret;
> +
> + ret = numa_register_memblks(&numa_meminfo);
> + if (ret < 0)
> + return ret;
> +
> + for (i = 0; i < nr_cpu_ids; i++)
> + numa_clear_node(i);
> +
> + setup_node_to_cpumask_map();
> + build_cpu_to_node_map();
> + return 0;
> +}
> +
> +/**
> + * dummy_numa_init - Fallback dummy NUMA init
> + *
> + * Used if there's no underlying NUMA architecture, NUMA initialization
> + * fails, or NUMA is disabled on the command line.
> + *
> + * Must online at least one node and add memory blocks that cover all
> + * allowed memory. This function must not fail.
> + */
> +static int __init dummy_numa_init(void)
> +{
> + pr_info("%s\n", "No NUMA configuration found");
> + pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n",
> + 0LLU, PFN_PHYS(max_pfn) - 1);
> + node_set(0, numa_nodes_parsed);
> + numa_add_memblk(0, 0, PFN_PHYS(max_pfn));
> + dummy_numa_enabled = 1;
> +
> + return 0;
> +}
> +
> +/**
> + * arm64_numa_init - Initialize NUMA
> + *
> + * Try each configured NUMA initialization method until one succeeds. The
> + * last fallback is dummy single node config encomapssing whole memory and
> + * never fails.
> + */
> +void __init arm64_numa_init(void)
> +{
> + numa_init(dummy_numa_init);
> +}
> --
> 1.8.1.4
>
thanks
Ganapat
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