[PATCH V7 21/22] LoongArch: Add Non-Uniform Memory Access (NUMA) support

From: Huacai Chen
Date: Sun Mar 06 2022 - 06:45:43 EST

This patch adds Non-Uniform Memory Access (NUMA) support for LoongArch.
LoongArch has 48-bit physical address, but the HT I/O bus only support
40-bit address, so we need a custom phys_to_dma() and dma_to_phys() to
extract the 4-bit node id (bit 44~47) from Loongson-3's 48-bit physical
address space and embed it into 40-bit. In the 40-bit dma address, node
id offset can be read from the LS7A_DMA_CFG register.

Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
---
arch/loongarch/Kconfig | 26 ++
arch/loongarch/include/asm/bootinfo.h | 1 +
arch/loongarch/include/asm/dma-direct.h | 11 +
arch/loongarch/include/asm/mmzone.h | 18 +
arch/loongarch/include/asm/numa.h | 69 ++++
arch/loongarch/include/asm/pgtable.h | 12 +
arch/loongarch/include/asm/topology.h | 21 ++
arch/loongarch/kernel/Makefile | 2 +
arch/loongarch/kernel/acpi.c | 96 +++++
arch/loongarch/kernel/dma.c | 40 ++
arch/loongarch/kernel/module.c | 1 +
arch/loongarch/kernel/numa.c | 461 ++++++++++++++++++++++++
arch/loongarch/kernel/setup.c | 8 +-
arch/loongarch/kernel/smp.c | 52 ++-
arch/loongarch/kernel/topology.c | 5 +
arch/loongarch/mm/init.c | 30 ++
arch/loongarch/pci/acpi.c | 3 +
17 files changed, 837 insertions(+), 19 deletions(-)
create mode 100644 arch/loongarch/include/asm/dma-direct.h
create mode 100644 arch/loongarch/include/asm/mmzone.h
create mode 100644 arch/loongarch/include/asm/numa.h
create mode 100644 arch/loongarch/kernel/dma.c
create mode 100644 arch/loongarch/kernel/numa.c

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index a4f50f6c128a..2faca427bbc7 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -8,6 +8,7 @@ config LOONGARCH
select ARCH_ENABLE_MEMORY_HOTPLUG
select ARCH_ENABLE_MEMORY_HOTREMOVE
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
+ select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_INLINE_READ_LOCK if !PREEMPTION
@@ -42,6 +43,7 @@ config LOONGARCH
select ARCH_SUPPORTS_ACPI
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_SUPPORTS_HUGETLBFS
+ select ARCH_SUPPORTS_NUMA_BALANCING
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_USE_QUEUED_RWLOCKS
@@ -96,6 +98,7 @@ config LOONGARCH
select HAVE_PERF_EVENTS
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RSEQ
+ select HAVE_SETUP_PER_CPU_AREA if NUMA
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_TIF_NOHZ
select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
@@ -103,6 +106,8 @@ config LOONGARCH
select IRQ_LOONGARCH_CPU
select MODULES_USE_ELF_REL if MODULES
select MODULES_USE_ELF_RELA if MODULES
+ select NEED_PER_CPU_EMBED_FIRST_CHUNK
+ select NEED_PER_CPU_PAGE_FIRST_CHUNK
select PCI
select PCI_DOMAINS_GENERIC
select PCI_ECAM if ACPI
@@ -113,6 +118,7 @@ config LOONGARCH
select SYSCTL_EXCEPTION_TRACE
select SWIOTLB
select TRACE_IRQFLAGS_SUPPORT
+ select USE_PERCPU_NUMA_NODE_ID
select ZONE_DMA32

config 32BIT
@@ -309,6 +315,21 @@ config NR_CPUS
This allows you to specify the maximum number of CPUs which this
kernel will support.

+config NUMA
+ bool "NUMA Support"
+ select ACPI_NUMA if ACPI
+ help
+ Say Y to compile the kernel to support NUMA (Non-Uniform Memory
+ Access). This option improves performance on systems with more
+ than two nodes; on two node systems it is generally better to
+ leave it disabled; on single node systems disable this option
+ disabled.
+
+config NODES_SHIFT
+ int
+ default "6"
+ depends on NUMA
+
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
range 14 64 if PAGE_SIZE_64KB
@@ -355,6 +376,7 @@ config ARCH_SELECT_MEMORY_MODEL

config ARCH_FLATMEM_ENABLE
def_bool y
+ depends on !NUMA

config ARCH_SPARSEMEM_ENABLE
def_bool y
@@ -372,6 +394,10 @@ config ARCH_MEMORY_PROBE
def_bool y
depends on MEMORY_HOTPLUG

+config HAVE_ARCH_NODEDATA_EXTENSION
+ def_bool y
+ depends on NUMA && ARCH_ENABLE_MEMORY_HOTPLUG
+
config MMU
bool
default y
diff --git a/arch/loongarch/include/asm/bootinfo.h b/arch/loongarch/include/asm/bootinfo.h
index 327b64b48017..763a97a225e4 100644
--- a/arch/loongarch/include/asm/bootinfo.h
+++ b/arch/loongarch/include/asm/bootinfo.h
@@ -15,6 +15,7 @@ extern void detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_ad

extern void early_init(void);
extern void platform_init(void);
+extern void plat_swiotlb_setup(void);

/*
* Initial kernel command line, usually setup by fw_init_cmdline()
diff --git a/arch/loongarch/include/asm/dma-direct.h b/arch/loongarch/include/asm/dma-direct.h
new file mode 100644
index 000000000000..75ccd808a2af
--- /dev/null
+++ b/arch/loongarch/include/asm/dma-direct.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef _LOONGARCH_DMA_DIRECT_H
+#define _LOONGARCH_DMA_DIRECT_H
+
+dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
+phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
+
+#endif /* _LOONGARCH_DMA_DIRECT_H */
diff --git a/arch/loongarch/include/asm/mmzone.h b/arch/loongarch/include/asm/mmzone.h
new file mode 100644
index 000000000000..fe67d0b4b33d
--- /dev/null
+++ b/arch/loongarch/include/asm/mmzone.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Author: Huacai Chen (chenhuacai@xxxxxxxxxxx)
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_MMZONE_H_
+#define _ASM_MMZONE_H_
+
+#include <asm/page.h>
+#include <asm/numa.h>
+
+extern struct pglist_data *node_data[];
+
+#define NODE_DATA(nid) (node_data[(nid)])
+
+extern void setup_zero_pages(void);
+
+#endif /* _ASM_MMZONE_H_ */
diff --git a/arch/loongarch/include/asm/numa.h b/arch/loongarch/include/asm/numa.h
new file mode 100644
index 000000000000..8f9c81af7930
--- /dev/null
+++ b/arch/loongarch/include/asm/numa.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * LoongArch specific ACPICA environments and implementation
+ *
+ * Author: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
+ * Huacai Chen <chenhuacai@xxxxxxxxxxx>
+ *
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#ifndef _ASM_LOONGARCH_NUMA_H
+#define _ASM_LOONGARCH_NUMA_H
+
+#include <linux/nodemask.h>
+
+#define NODE_ADDRSPACE_SHIFT 44
+
+#define pa_to_nid(addr) (((addr) & 0xf00000000000) >> NODE_ADDRSPACE_SHIFT)
+#define nid_to_addrbase(nid) (_ULCAST_(nid) << NODE_ADDRSPACE_SHIFT)
+
+#ifdef CONFIG_NUMA
+
+extern int numa_off;
+extern s16 __cpuid_to_node[CONFIG_NR_CPUS];
+extern nodemask_t numa_nodes_parsed __initdata;
+
+struct numa_memblk {
+ u64 start;
+ u64 end;
+ int nid;
+};
+
+#define NR_NODE_MEMBLKS (MAX_NUMNODES*2)
+struct numa_meminfo {
+ int nr_blks;
+ struct numa_memblk blk[NR_NODE_MEMBLKS];
+};
+
+extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
+
+extern void __init early_numa_add_cpu(int cpuid, s16 node);
+extern void numa_add_cpu(unsigned int cpu);
+extern void numa_remove_cpu(unsigned int cpu);
+
+static inline void numa_clear_node(int cpu)
+{
+}
+
+static inline void set_cpuid_to_node(int cpuid, s16 node)
+{
+ __cpuid_to_node[cpuid] = node;
+}
+
+extern int early_cpu_to_node(int cpu);
+
+#else
+
+static inline void early_numa_add_cpu(int cpuid, s16 node) { }
+static inline void numa_add_cpu(unsigned int cpu) { }
+static inline void numa_remove_cpu(unsigned int cpu) { }
+
+static inline int early_cpu_to_node(int cpu)
+{
+ return 0;
+}
+
+#endif /* CONFIG_NUMA */
+
+#endif /* _ASM_LOONGARCH_NUMA_H */
diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
index 27b616afeb5f..a51c7871612c 100644
--- a/arch/loongarch/include/asm/pgtable.h
+++ b/arch/loongarch/include/asm/pgtable.h
@@ -595,6 +595,18 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,

#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

+#ifdef CONFIG_NUMA_BALANCING
+static inline long pte_protnone(pte_t pte)
+{
+ return (pte_val(pte) & _PAGE_PROTNONE);
+}
+
+static inline long pmd_protnone(pmd_t pmd)
+{
+ return (pmd_val(pmd) & _PAGE_PROTNONE);
+}
+#endif /* CONFIG_NUMA_BALANCING */
+
/*
* We provide our own get_unmapped area to cope with the virtual aliasing
* constraints placed on us by the cache architecture.
diff --git a/arch/loongarch/include/asm/topology.h b/arch/loongarch/include/asm/topology.h
index 9314d7a3998c..464901c17654 100644
--- a/arch/loongarch/include/asm/topology.h
+++ b/arch/loongarch/include/asm/topology.h
@@ -7,6 +7,27 @@

#include <linux/smp.h>

+#ifdef CONFIG_NUMA
+
+extern cpumask_t cpus_on_node[];
+
+#define cpumask_of_node(node) (&cpus_on_node[node])
+
+struct pci_bus;
+extern int pcibus_to_node(struct pci_bus *);
+
+#define cpumask_of_pcibus(bus) (cpu_online_mask)
+
+extern unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
+
+void numa_set_distance(int from, int to, int distance);
+
+#define node_distance(from, to) (__node_distances[(from)][(to)])
+
+#else
+#define pcibus_to_node(bus) 0
+#endif
+
#ifdef CONFIG_SMP
#define topology_physical_package_id(cpu) (cpu_data[cpu].package)
#define topology_core_id(cpu) (cpu_core(&cpu_data[cpu]))
diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile
index 9d5cb652bfc0..66f5cd49fb03 100644
--- a/arch/loongarch/kernel/Makefile
+++ b/arch/loongarch/kernel/Makefile
@@ -21,4 +21,6 @@ obj-$(CONFIG_PROC_FS) += proc.o

obj-$(CONFIG_SMP) += smp.o

+obj-$(CONFIG_NUMA) += numa.o
+
CPPFLAGS_vmlinux.lds := $(KBUILD_CFLAGS)
diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c
index 0c7f2d1077a1..37e52d6e7833 100644
--- a/arch/loongarch/kernel/acpi.c
+++ b/arch/loongarch/kernel/acpi.c
@@ -14,6 +14,7 @@
#include <linux/memblock.h>
#include <linux/serial_core.h>
#include <asm/io.h>
+#include <asm/numa.h>
#include <asm/loongson.h>

int acpi_disabled;
@@ -367,6 +368,80 @@ int __init acpi_boot_init(void)
return 0;
}

+#ifdef CONFIG_ACPI_NUMA
+
+static __init int setup_node(int pxm)
+{
+ return acpi_map_pxm_to_node(pxm);
+}
+
+/*
+ * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for
+ * I/O localities since SRAT does not list them. I/O localities are
+ * not supported at this point.
+ */
+extern unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
+unsigned int numa_distance_cnt;
+
+static inline unsigned int get_numa_distances_cnt(struct acpi_table_slit *slit)
+{
+ return slit->locality_count;
+}
+
+void __init numa_set_distance(int from, int to, int distance)
+{
+ 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;
+ }
+
+ __node_distances[from][to] = distance;
+}
+
+/* Callback for Proximity Domain -> CPUID mapping */
+void __init
+acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
+{
+ int pxm, node;
+
+ if (srat_disabled())
+ return;
+ if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
+ bad_srat();
+ return;
+ }
+ if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
+ return;
+ pxm = pa->proximity_domain_lo;
+ if (acpi_srat_revision >= 2) {
+ pxm |= (pa->proximity_domain_hi[0] << 8);
+ pxm |= (pa->proximity_domain_hi[1] << 16);
+ pxm |= (pa->proximity_domain_hi[2] << 24);
+ }
+ node = setup_node(pxm);
+ if (node < 0) {
+ pr_err("SRAT: Too many proximity domains %x\n", pxm);
+ bad_srat();
+ return;
+ }
+
+ if (pa->apic_id >= CONFIG_NR_CPUS) {
+ pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u skipped apicid that is too big\n",
+ pxm, pa->apic_id, node);
+ return;
+ }
+
+ early_numa_add_cpu(pa->apic_id, node);
+
+ set_cpuid_to_node(pa->apic_id, node);
+ node_set(node, numa_nodes_parsed);
+ pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u\n", pxm, pa->apic_id, node);
+}
+
+void __init acpi_numa_arch_fixup(void) {}
+#endif
+
void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
{
memblock_reserve(addr, size);
@@ -376,6 +451,22 @@ void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)

#include <acpi/processor.h>

+static int __ref acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
+{
+#ifdef CONFIG_ACPI_NUMA
+ int nid;
+
+ nid = acpi_get_node(handle);
+ if (nid != NUMA_NO_NODE) {
+ set_cpuid_to_node(physid, nid);
+ node_set(nid, numa_nodes_parsed);
+ set_cpu_numa_node(cpu, nid);
+ cpumask_set_cpu(cpu, cpumask_of_node(nid));
+ }
+#endif
+ return 0;
+}
+
int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu)
{
int cpu;
@@ -386,6 +477,8 @@ int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu
return cpu;
}

+ acpi_map_cpu2node(handle, cpu, physid);
+
*pcpu = cpu;

return 0;
@@ -394,6 +487,9 @@ EXPORT_SYMBOL(acpi_map_cpu);

int acpi_unmap_cpu(int cpu)
{
+#ifdef CONFIG_ACPI_NUMA
+ set_cpuid_to_node(cpu_logical_map(cpu), NUMA_NO_NODE);
+#endif
set_cpu_present(cpu, false);
num_processors--;

diff --git a/arch/loongarch/kernel/dma.c b/arch/loongarch/kernel/dma.c
new file mode 100644
index 000000000000..659b8faccaee
--- /dev/null
+++ b/arch/loongarch/kernel/dma.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#include <linux/init.h>
+#include <linux/dma-direct.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-map-ops.h>
+#include <linux/swiotlb.h>
+
+#include <asm/bootinfo.h>
+#include <asm/dma.h>
+#include <asm/loongson.h>
+
+/*
+ * We extract 4bit node id (bit 44~47) from Loongson-3's
+ * 48bit physical address space and embed it into 40bit.
+ */
+
+static int node_id_offset;
+
+dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+ long nid = (paddr >> 44) & 0xf;
+
+ return ((nid << 44) ^ paddr) | (nid << node_id_offset);
+}
+
+phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+ long nid = (daddr >> node_id_offset) & 0xf;
+
+ return ((nid << node_id_offset) ^ daddr) | (nid << 44);
+}
+
+void __init plat_swiotlb_setup(void)
+{
+ swiotlb_init(1);
+ node_id_offset = ((readl(LS7A_DMA_CFG) & LS7A_DMA_NODE_MASK) >> LS7A_DMA_NODE_SHF) + 36;
+}
diff --git a/arch/loongarch/kernel/module.c b/arch/loongarch/kernel/module.c
index 63b5c8f1b13a..d0c263989103 100644
--- a/arch/loongarch/kernel/module.c
+++ b/arch/loongarch/kernel/module.c
@@ -11,6 +11,7 @@
#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/mm.h>
+#include <linux/numa.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/fs.h>
diff --git a/arch/loongarch/kernel/numa.c b/arch/loongarch/kernel/numa.c
new file mode 100644
index 000000000000..adf378a1b54d
--- /dev/null
+++ b/arch/loongarch/kernel/numa.c
@@ -0,0 +1,461 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Author: Xiang Gao <gaoxiang@xxxxxxxxxxx>
+ * Huacai Chen <chenhuacai@xxxxxxxxxxx>
+ *
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/mmzone.h>
+#include <linux/export.h>
+#include <linux/nodemask.h>
+#include <linux/swap.h>
+#include <linux/memblock.h>
+#include <linux/pfn.h>
+#include <linux/acpi.h>
+#include <linux/highmem.h>
+#include <linux/irq.h>
+#include <linux/pci.h>
+#include <asm/bootinfo.h>
+#include <asm/loongson.h>
+#include <asm/numa.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/sections.h>
+#include <asm/time.h>
+
+int numa_off;
+struct pglist_data *node_data[MAX_NUMNODES];
+unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
+
+EXPORT_SYMBOL(node_data);
+EXPORT_SYMBOL(__node_distances);
+
+static struct numa_meminfo numa_meminfo;
+cpumask_t cpus_on_node[MAX_NUMNODES];
+cpumask_t phys_cpus_on_node[MAX_NUMNODES];
+EXPORT_SYMBOL(cpus_on_node);
+
+/*
+ * apicid, cpu, node mappings
+ */
+s16 __cpuid_to_node[CONFIG_NR_CPUS] = {
+ [0 ... CONFIG_NR_CPUS - 1] = NUMA_NO_NODE
+};
+EXPORT_SYMBOL(__cpuid_to_node);
+
+nodemask_t numa_nodes_parsed __initdata;
+
+#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
+unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(__per_cpu_offset);
+
+static int __init pcpu_cpu_to_node(int cpu)
+{
+ return early_cpu_to_node(cpu);
+}
+
+static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
+{
+ if (early_cpu_to_node(from) == early_cpu_to_node(to))
+ return LOCAL_DISTANCE;
+ else
+ return REMOTE_DISTANCE;
+}
+
+void __init pcpu_populate_pte(unsigned long addr)
+{
+ pgd_t *pgd = pgd_offset_k(addr);
+ p4d_t *p4d = p4d_offset(pgd, addr);
+ pud_t *pud;
+ pmd_t *pmd;
+
+ if (p4d_none(*p4d)) {
+ pud_t *new;
+
+ new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+ pgd_populate(&init_mm, pgd, new);
+#ifndef __PAGETABLE_PUD_FOLDED
+ pud_init((unsigned long)new, (unsigned long)invalid_pmd_table);
+#endif
+ }
+
+ pud = pud_offset(p4d, addr);
+ if (pud_none(*pud)) {
+ pmd_t *new;
+
+ new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+ pud_populate(&init_mm, pud, new);
+#ifndef __PAGETABLE_PMD_FOLDED
+ pmd_init((unsigned long)new, (unsigned long)invalid_pte_table);
+#endif
+ }
+
+ pmd = pmd_offset(pud, addr);
+ if (!pmd_present(*pmd)) {
+ pte_t *new;
+
+ new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+ pmd_populate_kernel(&init_mm, pmd, new);
+ }
+}
+
+void __init setup_per_cpu_areas(void)
+{
+ unsigned long delta;
+ unsigned int cpu;
+ int rc = -EINVAL;
+
+ if (pcpu_chosen_fc == PCPU_FC_AUTO) {
+ if (nr_node_ids >= 8)
+ pcpu_chosen_fc = PCPU_FC_PAGE;
+ else
+ pcpu_chosen_fc = PCPU_FC_EMBED;
+ }
+
+ /*
+ * Always reserve area for module percpu variables. That's
+ * what the legacy allocator did.
+ */
+ if (pcpu_chosen_fc != PCPU_FC_PAGE) {
+ rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
+ PERCPU_DYNAMIC_RESERVE, PMD_SIZE,
+ pcpu_cpu_distance, pcpu_cpu_to_node);
+ if (rc < 0)
+ pr_warn("%s allocator failed (%d), falling back to page size\n",
+ pcpu_fc_names[pcpu_chosen_fc], rc);
+ }
+ if (rc < 0)
+ rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, pcpu_cpu_to_node);
+ if (rc < 0)
+ panic("cannot initialize percpu area (err=%d)", rc);
+
+ 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
+
+/*
+ * Get nodeid by logical cpu number.
+ * __cpuid_to_node maps phyical cpu id to node, so we
+ * should use cpu_logical_map(cpu) to index it.
+ *
+ * This routine is only used in early phase during
+ * booting, after setup_per_cpu_areas calling and numa_node
+ * initialization, cpu_to_node will be used instead.
+ */
+int early_cpu_to_node(int cpu)
+{
+ int physid = cpu_logical_map(cpu);
+
+ if (physid < 0)
+ return NUMA_NO_NODE;
+
+ return __cpuid_to_node[physid];
+}
+
+void __init early_numa_add_cpu(int cpuid, s16 node)
+{
+ int cpu = __cpu_number_map[cpuid];
+
+ if (cpu < 0)
+ return;
+
+ cpumask_set_cpu(cpu, &cpus_on_node[node]);
+ cpumask_set_cpu(cpuid, &phys_cpus_on_node[node]);
+}
+
+void numa_add_cpu(unsigned int cpu)
+{
+ int nid = cpu_to_node(cpu);
+ cpumask_set_cpu(cpu, &cpus_on_node[nid]);
+}
+
+void numa_remove_cpu(unsigned int cpu)
+{
+ int nid = cpu_to_node(cpu);
+ cpumask_clear_cpu(cpu, &cpus_on_node[nid]);
+}
+
+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;
+ }
+
+ mi->blk[mi->nr_blks].start = PFN_ALIGN(start);
+ mi->blk[mi->nr_blks].end = PFN_ALIGN(end - PAGE_SIZE + 1);
+ 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.
+ */
+int __init numa_add_memblk(int nid, u64 start, u64 end)
+{
+ return numa_add_memblk_to(nid, start, end, &numa_meminfo);
+}
+
+static void __init alloc_node_data(int nid)
+{
+ void *nd;
+ unsigned long nd_pa;
+ size_t nd_sz = roundup(sizeof(pg_data_t), PAGE_SIZE);
+
+ nd_pa = memblock_phys_alloc_try_nid(nd_sz, SMP_CACHE_BYTES, nid);
+ if (!nd_pa) {
+ pr_err("Cannot find %zu Byte for node_data (initial node: %d)\n", nd_sz, nid);
+ return;
+ }
+
+ nd = __va(nd_pa);
+
+ node_data[nid] = nd;
+ memset(nd, 0, sizeof(pg_data_t));
+}
+
+static void __init node_mem_init(unsigned int node)
+{
+ unsigned long start_pfn, end_pfn;
+ unsigned long node_addrspace_offset;
+
+ node_addrspace_offset = nid_to_addrbase(node);
+ pr_info("Node%d's addrspace_offset is 0x%lx\n",
+ node, node_addrspace_offset);
+
+ get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
+ pr_info("Node%d: start_pfn=0x%lx, end_pfn=0x%lx\n",
+ node, start_pfn, end_pfn);
+
+ alloc_node_data(node);
+}
+
+#ifdef CONFIG_ACPI_NUMA
+
+/*
+ * 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)
+{
+ int i;
+ u64 numaram, biosram;
+
+ 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;
+ }
+ max_pfn = max_low_pfn;
+ biosram = max_pfn - absent_pages_in_range(0, max_pfn);
+
+ BUG_ON((s64)(biosram - numaram) >= (1 << (20 - PAGE_SHIFT)));
+ return true;
+}
+
+static void __init add_node_intersection(u32 node, u64 start, u64 size)
+{
+ static unsigned long num_physpages;
+
+ num_physpages += (size >> PAGE_SHIFT);
+ pr_info("Node%d: mem_type:%d, mem_start:0x%llx, mem_size:0x%llx Bytes\n",
+ node, ADDRESS_TYPE_SYSRAM, start, size);
+ pr_info(" start_pfn:0x%llx, end_pfn:0x%llx, num_physpages:0x%lx\n",
+ start >> PAGE_SHIFT, (start + size) >> PAGE_SHIFT, num_physpages);
+ memblock_set_node(start, size, &memblock.memory, node);
+}
+
+/*
+ * add_numamem_region
+ *
+ * Add a uasable memory region described by BIOS. The
+ * routine gets each intersection between BIOS's region
+ * and node's region, and adds them into node's memblock
+ * pool.
+ *
+ */
+static void __init add_numamem_region(u64 start, u64 end)
+{
+ u32 i;
+ u64 ofs = start;
+
+ if (start >= end) {
+ pr_debug("Invalid region: %016llx-%016llx\n", start, end);
+ return;
+ }
+
+ for (i = 0; i < numa_meminfo.nr_blks; i++) {
+ struct numa_memblk *mb = &numa_meminfo.blk[i];
+
+ if (ofs > mb->end)
+ continue;
+
+ if (end > mb->end) {
+ add_node_intersection(mb->nid, ofs, mb->end - ofs);
+ ofs = mb->end;
+ } else {
+ add_node_intersection(mb->nid, ofs, end - ofs);
+ break;
+ }
+ }
+}
+
+static void __init init_node_memblock(void)
+{
+ u32 i, mem_type;
+ u64 mem_end, mem_start, mem_size;
+
+ /* Parse memory information and activate */
+ for (i = 0; i < loongson_mem_map->map_count; i++) {
+ mem_type = loongson_mem_map->map[i].mem_type;
+ mem_start = loongson_mem_map->map[i].mem_start;
+ mem_size = loongson_mem_map->map[i].mem_size;
+ mem_end = loongson_mem_map->map[i].mem_start + mem_size;
+ switch (mem_type) {
+ case ADDRESS_TYPE_SYSRAM:
+ mem_start = PFN_ALIGN(mem_start);
+ mem_end = PFN_ALIGN(mem_end - PAGE_SIZE + 1);
+ add_numamem_region(mem_start, mem_end);
+ break;
+ case ADDRESS_TYPE_ACPI:
+ mem_start = PFN_ALIGN(mem_start);
+ mem_end = PFN_ALIGN(mem_end - PAGE_SIZE + 1);
+ memblock_add(mem_start, mem_size);
+ add_numamem_region(mem_start, mem_end);
+ fallthrough;
+ case ADDRESS_TYPE_RESERVED:
+ pr_info("Resvd: mem_type:%d, mem_start:0x%llx, mem_size:0x%llx Bytes\n",
+ mem_type, mem_start, mem_size);
+ memblock_reserve(mem_start, mem_size);
+ break;
+ }
+ }
+}
+
+static void __init numa_default_distance(void)
+{
+ int row, col;
+
+ for (row = 0; row < MAX_NUMNODES; row++)
+ for (col = 0; col < MAX_NUMNODES; col++) {
+ if (col == row)
+ __node_distances[row][col] = LOCAL_DISTANCE;
+ else
+ /* We assume that one node per package here!
+ *
+ * A SLIT should be used for multiple nodes per
+ * package to override default setting.
+ */
+ __node_distances[row][col] = REMOTE_DISTANCE;
+ }
+}
+
+static int __init numa_mem_init(int (*init_func)(void))
+{
+ int i;
+ int ret;
+ int node;
+
+ for (i = 0; i < NR_CPUS; i++)
+ set_cpuid_to_node(i, NUMA_NO_NODE);
+
+ numa_default_distance();
+ nodes_clear(numa_nodes_parsed);
+ nodes_clear(node_possible_map);
+ nodes_clear(node_online_map);
+ memset(&numa_meminfo, 0, sizeof(numa_meminfo));
+
+ /* Parse SRAT and SLIT if provided by firmware. */
+ ret = init_func();
+ if (ret < 0)
+ return ret;
+
+ node_possible_map = numa_nodes_parsed;
+ if (WARN_ON(nodes_empty(node_possible_map)))
+ return -EINVAL;
+
+ init_node_memblock();
+ if (numa_meminfo_cover_memory(&numa_meminfo) == false)
+ return -EINVAL;
+
+ for_each_node_mask(node, node_possible_map) {
+ node_mem_init(node);
+ node_set_online(node);
+ }
+ max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
+
+ return 0;
+}
+#endif
+void __init paging_init(void)
+{
+ unsigned int node;
+ unsigned long zones_size[MAX_NR_ZONES] = {0, };
+
+ for_each_online_node(node) {
+ unsigned long start_pfn, end_pfn;
+
+ get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
+
+ if (end_pfn > max_low_pfn)
+ max_low_pfn = end_pfn;
+ }
+#ifdef CONFIG_ZONE_DMA32
+ zones_size[ZONE_DMA32] = MAX_DMA32_PFN;
+#endif
+ zones_size[ZONE_NORMAL] = max_low_pfn;
+ free_area_init(zones_size);
+}
+
+void __init mem_init(void)
+{
+ high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
+ memblock_free_all();
+ setup_zero_pages(); /* This comes from node 0 */
+}
+
+int pcibus_to_node(struct pci_bus *bus)
+{
+ return dev_to_node(&bus->dev);
+}
+EXPORT_SYMBOL(pcibus_to_node);
+
+void __init fw_init_numa_memory(void)
+{
+ numa_mem_init(acpi_numa_init);
+ setup_nr_node_ids();
+ loongson_sysconf.nr_nodes = nr_node_ids;
+ loongson_sysconf.cores_per_node = cpumask_weight(&phys_cpus_on_node[0]);
+}
+EXPORT_SYMBOL(fw_init_numa_memory);
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index 3cdec37123b4..fdfaa1439beb 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -310,7 +310,11 @@ void __init platform_init(void)
acpi_boot_init();
#endif

+#ifndef CONFIG_NUMA
fw_init_memory();
+#else
+ fw_init_numa_memory();
+#endif
dmi_setup();
smbios_parse();
pr_info("The BIOS Version: %s\n", b_info.bios_version);
@@ -339,7 +343,9 @@ static void __init arch_mem_init(char **cmdline_p)

check_kernel_sections_mem();

+#ifndef CONFIG_NUMA
memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
+#endif

memblock_set_current_limit(PFN_PHYS(max_low_pfn));

@@ -353,7 +359,7 @@ static void __init arch_mem_init(char **cmdline_p)
sparse_init();
memblock_set_bottom_up(true);

- swiotlb_init(1);
+ plat_swiotlb_setup();

dma_contiguous_reserve(PFN_PHYS(max_low_pfn));

diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
index e3168b3dc3c0..c9de567ee940 100644
--- a/arch/loongarch/kernel/smp.c
+++ b/arch/loongarch/kernel/smp.c
@@ -25,6 +25,7 @@
#include <asm/idle.h>
#include <asm/loongson.h>
#include <asm/mmu_context.h>
+#include <asm/numa.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <asm/time.h>
@@ -225,6 +226,9 @@ void loongson3_init_secondary(void)

iocsr_writel(0xffffffff, LOONGARCH_IOCSR_IPI_EN);

+#ifdef CONFIG_NUMA
+ numa_add_cpu(cpu);
+#endif
per_cpu(cpu_state, cpu) = CPU_ONLINE;
cpu_set_core(&cpu_data[cpu],
cpu_logical_map(cpu) % loongson_sysconf.cores_per_package);
@@ -268,6 +272,9 @@ int loongson3_cpu_disable(void)
if (io_master(cpu))
return -EBUSY;

+#ifdef CONFIG_NUMA
+ numa_remove_cpu(cpu);
+#endif
set_cpu_online(cpu, false);
calculate_cpu_foreign_map();
local_irq_save(flags);
@@ -491,14 +498,36 @@ void calculate_cpu_foreign_map(void)
/* Preload SMP state for boot cpu */
void smp_prepare_boot_cpu(void)
{
- unsigned int cpu;
+ unsigned int cpu, node, rr_node;

set_cpu_possible(0, true);
set_cpu_online(0, true);
set_my_cpu_offset(per_cpu_offset(0));

- for_each_possible_cpu(cpu)
- set_cpu_numa_node(cpu, 0);
+ rr_node = first_node(node_online_map);
+ for_each_possible_cpu(cpu) {
+ node = early_cpu_to_node(cpu);
+
+ /*
+ * The mapping between present cpus and nodes has been
+ * built during MADT and SRAT parsing.
+ *
+ * If possible cpus = present cpus here, early_cpu_to_node
+ * will return valid node.
+ *
+ * If possible cpus > present cpus here (e.g. some possible
+ * cpus will be added by cpu-hotplug later), for possible but
+ * not present cpus, early_cpu_to_node will return NUMA_NO_NODE,
+ * and we just map them to online nodes in round-robin way.
+ * Once hotplugged, new correct mapping will be built for them.
+ */
+ if (node != NUMA_NO_NODE)
+ set_cpu_numa_node(cpu, node);
+ else {
+ set_cpu_numa_node(cpu, rr_node);
+ rr_node = next_node_in(rr_node, node_online_map);
+ }
+ }
}

/* called from main before smp_init() */
@@ -661,17 +690,10 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned l
on_each_cpu_mask(mm_cpumask(mm), flush_tlb_range_ipi, &fd, 1);
} else {
unsigned int cpu;
- int exec = vma->vm_flags & VM_EXEC;

for_each_online_cpu(cpu) {
- /*
- * flush_cache_range() will only fully flush icache if
- * the VMA is executable, otherwise we must invalidate
- * ASID without it appearing to has_valid_asid() as if
- * mm has been completely unused by that CPU.
- */
if (cpu != smp_processor_id() && cpu_context(cpu, mm))
- cpu_context(cpu, mm) = !exec;
+ cpu_context(cpu, mm) = 0;
}
local_flush_tlb_range(vma, start, end);
}
@@ -716,14 +738,8 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
unsigned int cpu;

for_each_online_cpu(cpu) {
- /*
- * flush_cache_page() only does partial flushes, so
- * invalidate ASID without it appearing to
- * has_valid_asid() as if mm has been completely unused
- * by that CPU.
- */
if (cpu != smp_processor_id() && cpu_context(cpu, vma->vm_mm))
- cpu_context(cpu, vma->vm_mm) = 1;
+ cpu_context(cpu, vma->vm_mm) = 0;
}
local_flush_tlb_page(vma, page);
}
diff --git a/arch/loongarch/kernel/topology.c b/arch/loongarch/kernel/topology.c
index ab1a75c0b5a6..ae5f0e5414a3 100644
--- a/arch/loongarch/kernel/topology.c
+++ b/arch/loongarch/kernel/topology.c
@@ -37,6 +37,11 @@ static int __init topology_init(void)
{
int i, ret;

+#ifdef CONFIG_NUMA
+ for_each_online_node(i)
+ register_one_node(i);
+#endif /* CONFIG_NUMA */
+
for_each_present_cpu(i) {
struct cpu *c = &per_cpu(cpu_devices, i);

diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c
index f44c9fa8f435..add529b2e620 100644
--- a/arch/loongarch/mm/init.c
+++ b/arch/loongarch/mm/init.c
@@ -93,6 +93,7 @@ void copy_from_user_page(struct vm_area_struct *vma,
}
EXPORT_SYMBOL_GPL(copy_from_user_page);

+#ifndef CONFIG_NUMA
void __init paging_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES];
@@ -116,6 +117,7 @@ void __init mem_init(void)
memblock_free_all();
setup_zero_pages(); /* Setup zeroed pages. */
}
+#endif /* !CONFIG_NUMA */

void __ref free_initmem(void)
{
@@ -138,6 +140,34 @@ int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params)
return ret;
}

+#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
+pg_data_t *arch_alloc_nodedata(int nid)
+{
+ return kzalloc(sizeof(pg_data_t), GFP_KERNEL);
+}
+
+void arch_free_nodedata(pg_data_t *pgdat)
+{
+ kfree(pgdat);
+}
+
+void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
+{
+ BUG();
+}
+#endif
+
+#ifdef CONFIG_NUMA
+int memory_add_physaddr_to_nid(u64 start)
+{
+ int nid;
+
+ nid = pa_to_nid(start);
+ return nid;
+}
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+#endif
+
#ifdef CONFIG_MEMORY_HOTREMOVE
void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
{
diff --git a/arch/loongarch/pci/acpi.c b/arch/loongarch/pci/acpi.c
index 7cabb8f37218..bf921487333c 100644
--- a/arch/loongarch/pci/acpi.c
+++ b/arch/loongarch/pci/acpi.c
@@ -11,6 +11,7 @@
#include <linux/pci-ecam.h>

#include <asm/pci.h>
+#include <asm/numa.h>
#include <asm/loongson.h>

struct pci_root_info {
@@ -27,8 +28,10 @@ int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
{
struct pci_config_window *cfg = bridge->bus->sysdata;
struct acpi_device *adev = to_acpi_device(cfg->parent);
+ struct device *bus_dev = &bridge->bus->dev;

ACPI_COMPANION_SET(&bridge->dev, adev);
+ set_dev_node(bus_dev, pa_to_nid(cfg->res.start));

return 0;
}
--
2.27.0