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@xxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx>
+ *
+ * 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
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