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SubjectRe: [RFC PATCH] riscv: Add numa support for riscv64 platform
+Christoph, +Mike, +Ganpatro

On Tue, Dec 24, 2019 at 2:25 PM Greentime Hu <greentime.hu@sifive.com> wrote:
>
> This implementation is based on arm64 porting. It is tested with
> qemu-system-riscv64, unleashed board and OmniXtend FPGA platform.
>
> There will be 2 nodes in /sys/devices/system/node if it is described in dts and
> CONFIG_NUMA is enabled. We can use numastat/numactl/numademo to see its status.

This patch can be broken down into separate (more granular) patches.
For example:
1. asm/pgtable.h change can be separate patch
2. Movement of unflatten_device_tree() from setup_arch() to paging_init()
3. changes in kernel/smpboot.c can also be separate patch

Also, since this is ported from arm64 implementation, I strongly
suggest having a generic NUMA support which can be shared
between arm64 and riscv. I think Ganpat (CC'ed) here could be
the best person to maintain the generic NUMA support since he
originally added it for arm64.

>
> Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
> ---
> arch/riscv/Kconfig | 30 ++-
> arch/riscv/include/asm/mmzone.h | 13 ++
> arch/riscv/include/asm/numa.h | 46 ++++
> arch/riscv/include/asm/pci.h | 10 +
> arch/riscv/include/asm/pgtable.h | 20 ++
> arch/riscv/kernel/setup.c | 26 ++-
> arch/riscv/kernel/smpboot.c | 20 +-
> arch/riscv/mm/Makefile | 1 +
> arch/riscv/mm/init.c | 3 +
> arch/riscv/mm/numa.c | 372 +++++++++++++++++++++++++++++++
> 10 files changed, 536 insertions(+), 5 deletions(-)
> create mode 100644 arch/riscv/include/asm/mmzone.h
> create mode 100644 arch/riscv/include/asm/numa.h
> create mode 100644 arch/riscv/mm/numa.c
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index bc7598fc5f00..53ae1816df50 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -22,7 +22,6 @@ config RISCV
> select CLONE_BACKWARDS
> select COMMON_CLK
> select GENERIC_CLOCKEVENTS
> - select GENERIC_CPU_DEVICES
> select GENERIC_IRQ_SHOW
> select GENERIC_PCI_IOMAP
> select GENERIC_SCHED_CLOCK
> @@ -234,6 +233,35 @@ config TUNE_GENERIC
> bool "generic"
>
> endchoice
> +# Common NUMA Features
> +config NUMA
> + bool "Numa Memory Allocation and Scheduler Support"
> + select OF_NUMA
> + select ARCH_SUPPORTS_NUMA_BALANCING
> + depends on SPARSEMEM
> + help
> + Enable NUMA (Non Uniform Memory Access) support.
> +
> + The kernel will try to allocate memory used by a CPU on the
> + local memory 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
> +
> +config NEED_PER_CPU_EMBED_FIRST_CHUNK
> + def_bool y
> + depends on NUMA
>
> config RISCV_ISA_C
> bool "Emit compressed instructions when building Linux"
> diff --git a/arch/riscv/include/asm/mmzone.h b/arch/riscv/include/asm/mmzone.h
> new file mode 100644
> index 000000000000..fa17e01d9ab2
> --- /dev/null
> +++ b/arch/riscv/include/asm/mmzone.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __ASM_MMZONE_H
> +#define __ASM_MMZONE_H
> +
> +#ifdef CONFIG_NUMA
> +
> +#include <asm/numa.h>
> +
> +extern struct pglist_data *node_data[];
> +#define NODE_DATA(nid) (node_data[(nid)])
> +
> +#endif /* CONFIG_NUMA */
> +#endif /* __ASM_MMZONE_H */
> diff --git a/arch/riscv/include/asm/numa.h b/arch/riscv/include/asm/numa.h
> new file mode 100644
> index 000000000000..10a4513d078b
> --- /dev/null
> +++ b/arch/riscv/include/asm/numa.h
> @@ -0,0 +1,46 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __ASM_NUMA_H
> +#define __ASM_NUMA_H
> +
> +#include <asm/topology.h>
> +
> +#ifdef CONFIG_NUMA
> +
> +extern nodemask_t numa_nodes_parsed __initdata;
> +
> +extern bool numa_off;
> +
> +/* Mappings between node number and cpus on that node. */
> +extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
> +void numa_clear_node(unsigned int cpu);
> +
> +#ifdef CONFIG_DEBUG_PER_CPU_MAPS
> +const struct cpumask *cpumask_of_node(int node);
> +#else
> +/* Returns a pointer to the cpumask of CPUs on Node 'node'. */
> +static inline const struct cpumask *cpumask_of_node(int node)
> +{
> + return node_to_cpumask_map[node];
> +}
> +#endif
> +
> +void __init riscv_numa_init(void);
> +int __init numa_add_memblk(int nodeid, u64 start, u64 end);
> +void __init numa_set_distance(int from, int to, int distance);
> +void __init numa_free_distance(void);
> +void __init early_map_cpu_to_node(unsigned int cpu, int nid);
> +void numa_store_cpu_info(unsigned int cpu);
> +void numa_add_cpu(unsigned int cpu);
> +void numa_remove_cpu(unsigned int cpu);
> +
> +#else /* CONFIG_NUMA */
> +
> +static inline void numa_store_cpu_info(unsigned int cpu) { }
> +static inline void numa_add_cpu(unsigned int cpu) { }
> +static inline void numa_remove_cpu(unsigned int cpu) { }
> +static inline void riscv_numa_init(void) { }
> +static inline void early_map_cpu_to_node(unsigned int cpu, int nid) { }
> +
> +#endif /* CONFIG_NUMA */
> +
> +#endif /* __ASM_NUMA_H */
> diff --git a/arch/riscv/include/asm/pci.h b/arch/riscv/include/asm/pci.h
> index 5ac8daa1cc36..781aa8b6dcd3 100644
> --- a/arch/riscv/include/asm/pci.h
> +++ b/arch/riscv/include/asm/pci.h
> @@ -32,6 +32,16 @@ static inline int pci_proc_domain(struct pci_bus *bus)
> /* always show the domain in /proc */
> return 1;
> }
> +
> +#ifdef CONFIG_NUMA
> +int pcibus_to_node(struct pci_bus *bus);
> +#ifndef cpumask_of_pcibus
> +#define cpumask_of_pcibus(bus) (pcibus_to_node(bus) == -1 ? \
> + cpu_all_mask : \
> + cpumask_of_node(pcibus_to_node(bus)))
> +#endif
> +#endif /* CONFIG_NUMA */
> +
> #endif /* CONFIG_PCI */
>
> #endif /* __ASM_PCI_H */
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index d3221017194d..04b7c38870f7 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -175,6 +175,11 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
> return (unsigned long)pfn_to_virt(pmd_val(pmd) >> _PAGE_PFN_SHIFT);
> }
>
> +static inline pte_t pmd_pte(pmd_t pmd)
> +{
> + return __pte(pmd_val(pmd));
> +}
> +
> /* Yields the page frame number (PFN) of a page table entry */
> static inline unsigned long pte_pfn(pte_t pte)
> {
> @@ -288,6 +293,21 @@ static inline pte_t pte_mkhuge(pte_t pte)
> return pte;
> }
>
> +#ifdef CONFIG_NUMA_BALANCING
> +/*
> + * See the comment in include/asm-generic/pgtable.h
> + */
> +static inline int pte_protnone(pte_t pte)
> +{
> + return (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROT_NONE)) == _PAGE_PROT_NONE;
> +}
> +
> +static inline int pmd_protnone(pmd_t pmd)
> +{
> + return pte_protnone(pmd_pte(pmd));
> +}
> +#endif
> +
> /* Modify page protection bits */
> static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
> {
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 845ae0e12115..f6f2354036a0 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -53,6 +53,31 @@ void __init parse_dtb(void)
> #endif
> }
>
> +static DEFINE_PER_CPU(struct cpu, cpu_devices);
> +
> +static int __init topology_init(void)
> +{
> + int i, ret;
> +
> +#ifdef CONFIG_NEED_MULTIPLE_NODES
> + for_each_online_node(i)
> + register_one_node(i);
> +#endif
> +
> + for_each_possible_cpu(i) {
> + struct cpu *cpu = &per_cpu(cpu_devices, i);
> +
> + cpu->hotpluggable = 1;

Strange !!!

We cannot claim CPUs are hotpluggable until Atish's
Linux SBI v0.2 HSM patches are available.

If required then Linux RISC-V NUMA patches should
be based upon Atish's Linux SBI v0.2 HSM support.

> + ret = register_cpu(cpu, i);
> + if (unlikely(ret))
> + pr_warn("Warning: %s: register_cpu %d failed (%d)\n",
> + __func__, i, ret);
> + }
> +
> + return 0;
> +}
> +subsys_initcall(topology_init);
> +
> void __init setup_arch(char **cmdline_p)
> {
> init_mm.start_code = (unsigned long) _stext;
> @@ -66,7 +91,6 @@ void __init setup_arch(char **cmdline_p)
>
> setup_bootmem();
> paging_init();
> - unflatten_device_tree();

Movement of unflatten_device_tree() call from here to
paging_init() needs explanation.

>
> #ifdef CONFIG_SWIOTLB
> swiotlb_init(1);
> diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> index 261f4087cc39..bcb67ac403e4 100644
> --- a/arch/riscv/kernel/smpboot.c
> +++ b/arch/riscv/kernel/smpboot.c
> @@ -26,6 +26,7 @@
> #include <linux/sched/mm.h>
> #include <asm/irq.h>
> #include <asm/mmu_context.h>
> +#include <asm/numa.h>
> #include <asm/tlbflush.h>
> #include <asm/sections.h>
> #include <asm/sbi.h>
> @@ -45,6 +46,11 @@ void __init smp_prepare_boot_cpu(void)
> void __init smp_prepare_cpus(unsigned int max_cpus)
> {
> int cpuid;
> + unsigned int this_cpu;
> +
> + this_cpu = smp_processor_id();
> + numa_store_cpu_info(this_cpu);
> + numa_add_cpu(this_cpu);
>
> /* This covers non-smp usecase mandated by "nosmp" option */
> if (max_cpus == 0)
> @@ -54,6 +60,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
> if (cpuid == smp_processor_id())
> continue;
> set_cpu_present(cpuid, true);
> + numa_store_cpu_info(cpuid);
> }
> }
>
> @@ -72,6 +79,7 @@ void __init setup_smp(void)
> if (hart == cpuid_to_hartid_map(0)) {
> BUG_ON(found_boot_cpu);
> found_boot_cpu = 1;
> + early_map_cpu_to_node(0, of_node_to_nid(dn));
> continue;
> }
> if (cpuid >= NR_CPUS) {
> @@ -81,6 +89,7 @@ void __init setup_smp(void)
> }
>
> cpuid_to_hartid_map(cpuid) = hart;
> + early_map_cpu_to_node(cpuid, of_node_to_nid(dn));
> cpuid++;
> }
>
> @@ -136,15 +145,20 @@ void __init smp_cpus_done(unsigned int max_cpus)
> asmlinkage __visible void __init smp_callin(void)
> {
> struct mm_struct *mm = &init_mm;
> + unsigned int this_cpu;
> +
> + this_cpu = smp_processor_id();
>
> /* All kernel threads share the same mm context. */
> mmgrab(mm);
> current->active_mm = mm;
>
> trap_init();
> - notify_cpu_starting(smp_processor_id());
> - update_siblings_masks(smp_processor_id());
> - set_cpu_online(smp_processor_id(), 1);
> + notify_cpu_starting(this_cpu);
> + numa_store_cpu_info(this_cpu);
> + numa_add_cpu(this_cpu);
> + update_siblings_masks(this_cpu);
> + set_cpu_online(this_cpu, true);
> /*
> * Remote TLB flushes are ignored while the CPU is offline, so emit
> * a local TLB flush right now just in case.
> diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile
> index 9d9a17335686..59c956c0b0d0 100644
> --- a/arch/riscv/mm/Makefile
> +++ b/arch/riscv/mm/Makefile
> @@ -17,3 +17,4 @@ ifeq ($(CONFIG_MMU),y)
> obj-$(CONFIG_SMP) += tlbflush.o
> endif
> obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
> +obj-$(CONFIG_NUMA) += numa.o
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 573463d1c799..17c749744e05 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -18,6 +18,7 @@
> #include <asm/sections.h>
> #include <asm/pgtable.h>
> #include <asm/io.h>
> +#include <asm/numa.h>
>
> #include "../kernel/head.h"
>
> @@ -453,6 +454,8 @@ static void __init setup_vm_final(void)
> void __init paging_init(void)
> {
> setup_vm_final();
> + unflatten_device_tree();
> + riscv_numa_init();
> memblocks_present();
> sparse_init();
> setup_zero_page();
> diff --git a/arch/riscv/mm/numa.c b/arch/riscv/mm/numa.c
> new file mode 100644
> index 000000000000..b679b2831990
> --- /dev/null
> +++ b/arch/riscv/mm/numa.c
> @@ -0,0 +1,372 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * NUMA support, based on the arm64 implementation.
> + *
> + * Copyright (C) 2015 Cavium Inc.
> + * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
> + * Copyright (C) 2019 SiFive, Inc
> + */
> +
> +#define pr_fmt(fmt) "NUMA: " fmt
> +
> +#include <linux/memblock.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/device.h>
> +#include <linux/pci.h>
> +
> +struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
> +EXPORT_SYMBOL(node_data);
> +nodemask_t numa_nodes_parsed __initdata;
> +static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
> +
> +static u8 *numa_distance;
> +static int numa_distance_cnt;
> +bool numa_off;
> +
> +static __init int numa_parse_early_param(char *opt)
> +{
> + if (!opt)
> + return -EINVAL;
> + if (str_has_prefix(opt, "off"))
> + numa_off = true;
> +
> + return 0;
> +}
> +early_param("numa", numa_parse_early_param);
> +
> +cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
> +EXPORT_SYMBOL(node_to_cpumask_map);
> +
> +#ifdef CONFIG_DEBUG_PER_CPU_MAPS
> +
> +/*
> + * Returns a pointer to the bitmask of CPUs on Node 'node'.
> + */
> +const struct cpumask *cpumask_of_node(int node)
> +{
> + if (WARN_ON(node >= nr_node_ids))
> + return cpu_none_mask;
> +
> + if (WARN_ON(node_to_cpumask_map[node] == NULL))
> + return cpu_online_mask;
> +
> + return node_to_cpumask_map[node];
> +}
> +EXPORT_SYMBOL(cpumask_of_node);
> +
> +#endif
> +
> +int pcibus_to_node(struct pci_bus *bus)
> +{
> + return dev_to_node(&bus->dev);
> +}
> +EXPORT_SYMBOL(pcibus_to_node);
> +
> +static void numa_update_cpu(unsigned int cpu, bool remove)
> +{
> + int nid = cpu_to_node(cpu);
> +
> + if (nid == NUMA_NO_NODE)
> + return;
> +
> + if (remove)
> + cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
> + else
> + cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
> +}
> +
> +void numa_add_cpu(unsigned int cpu)
> +{
> + numa_update_cpu(cpu, false);
> +}
> +
> +/*
> + * Set the cpu to node and mem mapping
> + */
> +void numa_store_cpu_info(unsigned int cpu)
> +{
> + set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
> +}
> +
> +void __init early_map_cpu_to_node(unsigned int cpu, int nid)
> +{
> + /* fallback to node 0 */
> + if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
> + nid = 0;
> +
> + cpu_to_node_map[cpu] = nid;
> +
> + /*
> + * We should set the numa node of cpu0 as soon as possible, because it
> + * has already been set up online before. cpu_to_node(0) will soon be
> + * called.
> + */
> + if (!cpu)
> + set_cpu_numa_node(cpu, nid);
> +}
> +
> +static int __init numa_alloc_distance(void)
> +{
> + size_t size;
> + u64 phys;
> + int i, j;
> +
> + size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
> + phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
> + size, PAGE_SIZE);
> + if (WARN_ON(!phys))
> + return -ENOMEM;
> +
> + memblock_reserve(phys, size);
> +
> + numa_distance = __va(phys);
> + numa_distance_cnt = nr_node_ids;
> +
> + /* fill with the default distances */
> + for (i = 0; i < numa_distance_cnt; i++)
> + for (j = 0; j < numa_distance_cnt; j++)
> + numa_distance[i * numa_distance_cnt + j] = i == j ?
> + LOCAL_DISTANCE : REMOTE_DISTANCE;
> +
> + pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
> +
> + return 0;
> +}
> +
> +/**
> + * numa_add_memblk() - Set node id to memblk
> + * @nid: NUMA node ID of the new memblk
> + * @start: Start address of the new memblk
> + * @end: End address of the new memblk
> + *
> + * RETURNS:
> + * 0 on success, -errno on failure.
> + */
> +int __init numa_add_memblk(int nid, u64 start, u64 end)
> +{
> + int ret;
> +
> + ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
> + if (ret < 0) {
> + pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
> + start, (end - 1), nid);
> + return ret;
> + }
> +
> + node_set(nid, numa_nodes_parsed);
> + return ret;
> +}
> +
> +/*
> + * Initialize NODE_DATA for a node on the local memory
> + */
> +static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
> +{
> + const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
> + u64 nd_pa;
> + void *nd;
> + int tnid;
> +
> + if (start_pfn >= end_pfn)
> + pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
> +
> + nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
> + if (!nd_pa)
> + panic("Cannot allocate %zu bytes for node %d data\n",
> + nd_size, nid);
> +
> + 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_pfn;
> + NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
> +}
> +
> +void __init numa_set_distance(int from, int to, int distance)
> +{
> + if (!numa_distance) {
> + pr_warn_once("Warning: distance table not allocated yet\n");
> + return;
> + }
> +
> + if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
> + from < 0 || to < 0) {
> + pr_warn_once("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("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
> + from, to, distance);
> + return;
> + }
> +
> + numa_distance[from * numa_distance_cnt + to] = distance;
> +}
> +
> +/*
> + * Return NUMA distance @from to @to
> + */
> +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_nodes(void)
> +{
> + int nid;
> + struct memblock_region *mblk;
> +
> + /* Check that valid nid is set to memblks */
> + for_each_memblock(memory, mblk)
> + if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
> + pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
> + mblk->nid, mblk->base,
> + mblk->base + mblk->size - 1);
> + return -EINVAL;
> + }
> +
> + /* Finally register nodes. */
> + for_each_node_mask(nid, numa_nodes_parsed) {
> + unsigned long start_pfn, end_pfn;
> +
> + get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
> + setup_node_data(nid, start_pfn, end_pfn);
> + node_set_online(nid);
> + }
> +
> + /* Setup online nodes to actual nodes*/
> + node_possible_map = numa_nodes_parsed;
> +
> + return 0;
> +}
> +static void __init setup_node_to_cpumask_map(void)
> +{
> + int node;
> +
> + /* setup nr_node_ids if not done yet */
> + if (nr_node_ids == MAX_NUMNODES)
> + setup_nr_node_ids();
> +
> + /* allocate and clear the mapping */
> + for (node = 0; node < nr_node_ids; node++) {
> + alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
> + cpumask_clear(node_to_cpumask_map[node]);
> + }
> +
> + /* cpumask_of_node() will now work */
> + pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
> +}
> +
> +void __init numa_free_distance(void)
> +{
> + size_t size;
> +
> + if (!numa_distance)
> + return;
> +
> + size = numa_distance_cnt * numa_distance_cnt *
> + sizeof(numa_distance[0]);
> +
> + memblock_free(__pa(numa_distance), size);
> + numa_distance_cnt = 0;
> + numa_distance = NULL;
> +}
> +static int __init numa_init(int (*init_func)(void))
> +{
> + int ret;
> +
> + nodes_clear(numa_nodes_parsed);
> + nodes_clear(node_possible_map);
> + nodes_clear(node_online_map);
> +
> + ret = numa_alloc_distance();
> + if (ret < 0)
> + return ret;
> +
> + ret = init_func();
> + if (ret < 0)
> + goto out_free_distance;
> +
> + if (nodes_empty(numa_nodes_parsed)) {
> + pr_info("No NUMA configuration found\n");
> + ret = -EINVAL;
> + goto out_free_distance;
> + }
> +
> + ret = numa_register_nodes();
> + if (ret < 0)
> + goto out_free_distance;
> +
> + setup_node_to_cpumask_map();
> +
> + return 0;
> +out_free_distance:
> + numa_free_distance();
> + return ret;
> +}
> +
> +/**
> + * 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 (node 0) and add memory blocks that cover all
> + * allowed memory. It is unlikely that this function fails.
> + *
> + * Return: 0 on success, -errno on failure.
> + */
> +static int __init dummy_numa_init(void)
> +{
> + int ret;
> + struct memblock_region *mblk;
> +
> + if (numa_off)
> + pr_info("NUMA disabled\n"); /* Forced off on command line. */
> + pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n",
> + memblock_start_of_DRAM(), memblock_end_of_DRAM() - 1);
> +
> + for_each_memblock(memory, mblk) {
> + ret = numa_add_memblk(0, mblk->base, mblk->base + mblk->size);
> + if (!ret)
> + continue;
> +
> + pr_err("NUMA init failed\n");
> + return ret;
> + }
> +
> + numa_off = true;
> + return 0;
> +}
> +
> +/**
> + * riscv_numa_init() - Initialize NUMA
> + *
> + * Try each configured NUMA initialization method until one succeeds. The
> + * last fallback is dummy single node config encomapssing whole memory.
> + */
> +void __init riscv_numa_init(void)
> +{
> + if (!numa_off) {
> + if (!numa_init(of_numa_init))
> + return;
> + }
> +
> + numa_init(dummy_numa_init);
> +}
> --
> 2.17.1
>

Regards,
Anup

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