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
 30unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
 31EXPORT_SYMBOL(__node_distances);
 32
 33cpumask_t __node_cpumask[MAX_NUMNODES];
 34EXPORT_SYMBOL(__node_cpumask);
 35
 36static 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
 51static 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
 66static 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
 82static 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
126static __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
157void __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/* All PCI device belongs to logical Node-0 */
168int pcibus_to_node(struct pci_bus *bus)
169{
170	return 0;
171}
172EXPORT_SYMBOL(pcibus_to_node);
173
174void __init prom_init_numa_memory(void)
175{
176	pr_info("CP0_Config3: CP0 16.3 (0x%x)\n", read_c0_config3());
177	pr_info("CP0_PageGrain: CP0 5.1 (0x%x)\n", read_c0_pagegrain());
178	prom_meminit();
179}