arch/mips/loongson64/numa.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2010 Loongson Inc. & Lemote Inc. &
   4  *                    Institute of Computing Technology
   5  * Author:  Xiang Gao, gaoxiang@ict.ac.cn
   6  *          Huacai Chen, chenhc@lemote.com
   7  *          Xiaofu Meng, Shuangshuang Zhang
   8  */
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/mmzone.h>
  13 #include <linux/export.h>
  14 #include <linux/nodemask.h>
  15 #include <linux/swap.h>
  16 #include <linux/memblock.h>
  17 #include <linux/pfn.h>
  18 #include <linux/highmem.h>
  19 #include <asm/page.h>
  20 #include <asm/pgalloc.h>
  21 #include <asm/sections.h>
  22 #include <linux/irq.h>
  23 #include <asm/bootinfo.h>
  24 #include <asm/mc146818-time.h>
  25 #include <asm/time.h>
  26 #include <asm/wbflush.h>
  27 #include <boot_param.h>
  28 #include <loongson.h>
  29
  30 unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
  31 EXPORT_SYMBOL(__node_distances);
  32
  33 cpumask_t __node_cpumask[MAX_NUMNODES];
  34 EXPORT_SYMBOL(__node_cpumask);
  35
  36 static void cpu_node_probe(void)
  37 {
  38         int i;
  39
  40         nodes_clear(node_possible_map);
  41         nodes_clear(node_online_map);
  42         for (i = 0; i < loongson_sysconf.nr_nodes; i++) {
  43                 node_set_state(num_online_nodes(), N_POSSIBLE);
  44                 node_set_online(num_online_nodes());
  45         }
  46
  47         pr_info("NUMA: Discovered %d cpus on %d nodes\n",
  48                 loongson_sysconf.nr_cpus, num_online_nodes());
  49 }
  50
  51 static int __init compute_node_distance(int row, int col)
  52 {
  53         int package_row = row * loongson_sysconf.cores_per_node /
  54                                 loongson_sysconf.cores_per_package;
  55         int package_col = col * loongson_sysconf.cores_per_node /
  56                                 loongson_sysconf.cores_per_package;
  57
  58         if (col == row)
  59                 return LOCAL_DISTANCE;
  60         else if (package_row == package_col)
  61                 return 40;
  62         else
  63                 return 100;
  64 }
  65
  66 static void __init init_topology_matrix(void)
  67 {
  68         int row, col;
  69
  70         for (row = 0; row < MAX_NUMNODES; row++)
  71                 for (col = 0; col < MAX_NUMNODES; col++)
  72                         __node_distances[row][col] = -1;
  73
  74         for_each_online_node(row) {
  75                 for_each_online_node(col) {
  76                         __node_distances[row][col] =
  77                                 compute_node_distance(row, col);
  78                 }
  79         }
  80 }
  81
  82 static void __init node_mem_init(unsigned int node)
  83 {
  84         unsigned long node_addrspace_offset;
  85         unsigned long start_pfn, end_pfn;
  86
  87         node_addrspace_offset = nid_to_addrbase(node);
  88         pr_info("Node%d's addrspace_offset is 0x%lx\n",
  89                         node, node_addrspace_offset);
  90
  91         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
  92         pr_info("Node%d: start_pfn=0x%lx, end_pfn=0x%lx\n",
  93                 node, start_pfn, end_pfn);
  94
  95         alloc_node_data(node);
  96
  97         NODE_DATA(node)->node_start_pfn = start_pfn;
  98         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
  99
 100         if (node == 0) {
 101                 /* kernel start address */
 102                 unsigned long kernel_start_pfn = PFN_DOWN(__pa_symbol(&_text));
 103
 104                 /* kernel end address */
 105                 unsigned long kernel_end_pfn = PFN_UP(__pa_symbol(&_end));
 106
 107                 /* used by finalize_initrd() */
 108                 max_low_pfn = end_pfn;
 109
 110                 /* Reserve the kernel text/data/bss */
 111                 memblock_reserve(kernel_start_pfn << PAGE_SHIFT,
 112                                  ((kernel_end_pfn - kernel_start_pfn) << PAGE_SHIFT));
 113
 114                 /* Reserve 0xfe000000~0xffffffff for RS780E integrated GPU */
 115                 if (node_end_pfn(0) >= (0xffffffff >> PAGE_SHIFT))
 116                         memblock_reserve((node_addrspace_offset | 0xfe000000),
 117                                          32 << 20);
 118
 119                 /* Reserve pfn range 0~node[0]->node_start_pfn */
 120                 memblock_reserve(0, PAGE_SIZE * start_pfn);
 121                 /* set nid for reserved memory on node 0 */
 122                 memblock_set_node(0, 1ULL << 44, &memblock.reserved, 0);
 123         }
 124 }
 125
 126 static __init void prom_meminit(void)
 127 {
 128         unsigned int node, cpu, active_cpu = 0;
 129
 130         cpu_node_probe();
 131         init_topology_matrix();
 132
 133         for (node = 0; node < loongson_sysconf.nr_nodes; node++) {
 134                 if (node_online(node)) {
 135                         szmem(node);
 136                         node_mem_init(node);
 137                         cpumask_clear(&__node_cpumask[node]);
 138                 }
 139         }
 140         max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
 141
 142         for (cpu = 0; cpu < loongson_sysconf.nr_cpus; cpu++) {
 143                 node = cpu / loongson_sysconf.cores_per_node;
 144                 if (node >= num_online_nodes())
 145                         node = 0;
 146
 147                 if (loongson_sysconf.reserved_cpus_mask & (1<<cpu))
 148                         continue;
 149
 150                 cpumask_set_cpu(active_cpu, &__node_cpumask[node]);
 151                 pr_info("NUMA: set cpumask cpu %d on node %d\n", active_cpu, node);
 152
 153                 active_cpu++;
 154         }
 155 }
 156
 157 void __init paging_init(void)
 158 {
 159         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 160
 161         pagetable_init();
 162         zones_size[ZONE_DMA32] = MAX_DMA32_PFN;
 163         zones_size[ZONE_NORMAL] = max_low_pfn;
 164         free_area_init(zones_size);
 165 }
 166
 167 void __init mem_init(void)
 168 {
 169         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 170         memblock_free_all();
 171         setup_zero_pages();     /* This comes from node 0 */
 172 }
 173
 174 /* All PCI device belongs to logical Node-0 */
 175 int pcibus_to_node(struct pci_bus *bus)
 176 {
 177         return 0;
 178 }
 179 EXPORT_SYMBOL(pcibus_to_node);
 180
 181 void __init prom_init_numa_memory(void)
 182 {
 183         pr_info("CP0_Config3: CP0 16.3 (0x%x)\n", read_c0_config3());
 184         pr_info("CP0_PageGrain: CP0 5.1 (0x%x)\n", read_c0_pagegrain());
 185         prom_meminit();
 186 }