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 struct pglist_data *__node_data[MAX_NUMNODES];
  33 EXPORT_SYMBOL(__node_data);
  34
  35 cpumask_t __node_cpumask[MAX_NUMNODES];
  36 EXPORT_SYMBOL(__node_cpumask);
  37
  38 static void cpu_node_probe(void)
  39 {
  40         int i;
  41
  42         nodes_clear(node_possible_map);
  43         nodes_clear(node_online_map);
  44         for (i = 0; i < loongson_sysconf.nr_nodes; i++) {
  45                 node_set_state(num_online_nodes(), N_POSSIBLE);
  46                 node_set_online(num_online_nodes());
  47         }
  48
  49         pr_info("NUMA: Discovered %d cpus on %d nodes\n",
  50                 loongson_sysconf.nr_cpus, num_online_nodes());
  51 }
  52
  53 static int __init compute_node_distance(int row, int col)
  54 {
  55         int package_row = row * loongson_sysconf.cores_per_node /
  56                                 loongson_sysconf.cores_per_package;
  57         int package_col = col * loongson_sysconf.cores_per_node /
  58                                 loongson_sysconf.cores_per_package;
  59
  60         if (col == row)
  61                 return LOCAL_DISTANCE;
  62         else if (package_row == package_col)
  63                 return 40;
  64         else
  65                 return 100;
  66 }
  67
  68 static void __init init_topology_matrix(void)
  69 {
  70         int row, col;
  71
  72         for (row = 0; row < MAX_NUMNODES; row++)
  73                 for (col = 0; col < MAX_NUMNODES; col++)
  74                         __node_distances[row][col] = -1;
  75
  76         for_each_online_node(row) {
  77                 for_each_online_node(col) {
  78                         __node_distances[row][col] =
  79                                 compute_node_distance(row, col);
  80                 }
  81         }
  82 }
  83
  84 static void __init node_mem_init(unsigned int node)
  85 {
  86         struct pglist_data *nd;
  87         unsigned long node_addrspace_offset;
  88         unsigned long start_pfn, end_pfn;
  89         unsigned long nd_pa;
  90         int tnid;
  91         const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
  92
  93         node_addrspace_offset = nid_to_addrbase(node);
  94         pr_info("Node%d's addrspace_offset is 0x%lx\n",
  95                         node, node_addrspace_offset);
  96
  97         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
  98         pr_info("Node%d: start_pfn=0x%lx, end_pfn=0x%lx\n",
  99                 node, start_pfn, end_pfn);
 100
 101         nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, node);
 102         if (!nd_pa)
 103                 panic("Cannot allocate %zu bytes for node %d data\n",
 104                       nd_size, node);
 105         nd = __va(nd_pa);
 106         memset(nd, 0, sizeof(struct pglist_data));
 107         tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
 108         if (tnid != node)
 109                 pr_info("NODE_DATA(%d) on node %d\n", node, tnid);
 110         __node_data[node] = nd;
 111         NODE_DATA(node)->node_start_pfn = start_pfn;
 112         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
 113
 114         if (node == 0) {
 115                 /* kernel start address */
 116                 unsigned long kernel_start_pfn = PFN_DOWN(__pa_symbol(&_text));
 117
 118                 /* kernel end address */
 119                 unsigned long kernel_end_pfn = PFN_UP(__pa_symbol(&_end));
 120
 121                 /* used by finalize_initrd() */
 122                 max_low_pfn = end_pfn;
 123
 124                 /* Reserve the kernel text/data/bss */
 125                 memblock_reserve(kernel_start_pfn << PAGE_SHIFT,
 126                                  ((kernel_end_pfn - kernel_start_pfn) << PAGE_SHIFT));
 127
 128                 /* Reserve 0xfe000000~0xffffffff for RS780E integrated GPU */
 129                 if (node_end_pfn(0) >= (0xffffffff >> PAGE_SHIFT))
 130                         memblock_reserve((node_addrspace_offset | 0xfe000000),
 131                                          32 << 20);
 132
 133                 /* Reserve pfn range 0~node[0]->node_start_pfn */
 134                 memblock_reserve(0, PAGE_SIZE * start_pfn);
 135         }
 136 }
 137
 138 static __init void prom_meminit(void)
 139 {
 140         unsigned int node, cpu, active_cpu = 0;
 141
 142         cpu_node_probe();
 143         init_topology_matrix();
 144
 145         for (node = 0; node < loongson_sysconf.nr_nodes; node++) {
 146                 if (node_online(node)) {
 147                         szmem(node);
 148                         node_mem_init(node);
 149                         cpumask_clear(&__node_cpumask[node]);
 150                 }
 151         }
 152         max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
 153
 154         for (cpu = 0; cpu < loongson_sysconf.nr_cpus; cpu++) {
 155                 node = cpu / loongson_sysconf.cores_per_node;
 156                 if (node >= num_online_nodes())
 157                         node = 0;
 158
 159                 if (loongson_sysconf.reserved_cpus_mask & (1<<cpu))
 160                         continue;
 161
 162                 cpumask_set_cpu(active_cpu, &__node_cpumask[node]);
 163                 pr_info("NUMA: set cpumask cpu %d on node %d\n", active_cpu, node);
 164
 165                 active_cpu++;
 166         }
 167 }
 168
 169 void __init paging_init(void)
 170 {
 171         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 172
 173         pagetable_init();
 174         zones_size[ZONE_DMA32] = MAX_DMA32_PFN;
 175         zones_size[ZONE_NORMAL] = max_low_pfn;
 176         free_area_init(zones_size);
 177 }
 178
 179 void __init mem_init(void)
 180 {
 181         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 182         memblock_free_all();
 183         setup_zero_pages();     /* This comes from node 0 */
 184 }
 185
 186 /* All PCI device belongs to logical Node-0 */
 187 int pcibus_to_node(struct pci_bus *bus)
 188 {
 189         return 0;
 190 }
 191 EXPORT_SYMBOL(pcibus_to_node);
 192
 193 void __init prom_init_numa_memory(void)
 194 {
 195         pr_info("CP0_Config3: CP0 16.3 (0x%x)\n", read_c0_config3());
 196         pr_info("CP0_PageGrain: CP0 5.1 (0x%x)\n", read_c0_pagegrain());
 197         prom_meminit();
 198 }
 199 EXPORT_SYMBOL(prom_init_numa_memory);