1 // SPDX-License-Identifier: GPL-2.0
3 * acpi.c - Architecture-Specific Low-Level ACPI Boot Support
5 * Author: Jianmin Lv <lvjianmin@loongson.cn>
6 * Huacai Chen <chenhuacai@loongson.cn>
7 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
10 #include <linux/init.h>
11 #include <linux/acpi.h>
12 #include <linux/irq.h>
13 #include <linux/irqdomain.h>
14 #include <linux/memblock.h>
15 #include <linux/serial_core.h>
18 #include <asm/loongson.h>
21 EXPORT_SYMBOL(acpi_disabled);
23 int acpi_pci_disabled;
24 EXPORT_SYMBOL(acpi_pci_disabled);
25 int acpi_strict = 1; /* We have no workarounds on LoongArch */
31 #define MAX_CORE_PIC 256
33 #define PREFIX "ACPI: "
35 void __init __iomem * __acpi_map_table(unsigned long phys, unsigned long size)
41 return early_memremap(phys, size);
43 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
48 early_memunmap(map, size);
51 void __init __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
53 if (!memblock_is_memory(phys))
54 return ioremap(phys, size);
56 return ioremap_cache(phys, size);
59 void __init acpi_boot_table_init(void)
62 * If acpi_disabled, bail out
68 * Initialize the ACPI boot-time table parser.
70 if (acpi_table_init()) {
77 static int set_processor_mask(u32 id, u32 flags)
82 if (num_processors >= nr_cpu_ids) {
83 pr_warn(PREFIX "nr_cpus/possible_cpus limit of %i reached."
84 " processor 0x%x ignored.\n", nr_cpu_ids, cpuid);
89 if (cpuid == loongson_sysconf.boot_cpu_id)
92 cpu = cpumask_next_zero(-1, cpu_present_mask);
94 if (flags & ACPI_MADT_ENABLED) {
96 set_cpu_possible(cpu, true);
97 set_cpu_present(cpu, true);
98 __cpu_number_map[cpuid] = cpu;
99 __cpu_logical_map[cpu] = cpuid;
108 acpi_parse_processor(union acpi_subtable_headers *header, const unsigned long end)
110 struct acpi_madt_core_pic *processor = NULL;
112 processor = (struct acpi_madt_core_pic *)header;
113 if (BAD_MADT_ENTRY(processor, end))
116 acpi_table_print_madt_entry(&header->common);
118 set_processor_mask(processor->core_id, processor->flags);
125 acpi_parse_eio_master(union acpi_subtable_headers *header, const unsigned long end)
128 struct acpi_madt_eio_pic *eiointc = NULL;
130 eiointc = (struct acpi_madt_eio_pic *)header;
131 if (BAD_MADT_ENTRY(eiointc, end))
134 core = eiointc->node * CORES_PER_EIO_NODE;
135 set_bit(core, &(loongson_sysconf.cores_io_master));
140 static void __init acpi_process_madt(void)
145 for (i = 0; i < NR_CPUS; i++) {
146 __cpu_number_map[i] = -1;
147 __cpu_logical_map[i] = -1;
150 acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC,
151 acpi_parse_processor, MAX_CORE_PIC);
153 acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC,
154 acpi_parse_eio_master, MAX_IO_PICS);
156 loongson_sysconf.nr_cpus = num_processors;
159 int __init acpi_boot_init(void)
162 * If acpi_disabled, bail out
167 loongson_sysconf.boot_cpu_id = read_csr_cpuid();
170 * Process the Multiple APIC Description Table (MADT), if present
174 /* Do not enable ACPI SPCR console by default */
175 acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
180 #ifdef CONFIG_ACPI_NUMA
182 static __init int setup_node(int pxm)
184 return acpi_map_pxm_to_node(pxm);
188 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for
189 * I/O localities since SRAT does not list them. I/O localities are
190 * not supported at this point.
192 unsigned int numa_distance_cnt;
194 static inline unsigned int get_numa_distances_cnt(struct acpi_table_slit *slit)
196 return slit->locality_count;
199 void __init numa_set_distance(int from, int to, int distance)
201 if ((u8)distance != distance || (from == to && distance != LOCAL_DISTANCE)) {
202 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
207 node_distances[from][to] = distance;
210 /* Callback for Proximity Domain -> CPUID mapping */
212 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
218 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
222 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
224 pxm = pa->proximity_domain_lo;
225 if (acpi_srat_revision >= 2) {
226 pxm |= (pa->proximity_domain_hi[0] << 8);
227 pxm |= (pa->proximity_domain_hi[1] << 16);
228 pxm |= (pa->proximity_domain_hi[2] << 24);
230 node = setup_node(pxm);
232 pr_err("SRAT: Too many proximity domains %x\n", pxm);
237 if (pa->apic_id >= CONFIG_NR_CPUS) {
238 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u skipped apicid that is too big\n",
239 pxm, pa->apic_id, node);
243 early_numa_add_cpu(pa->apic_id, node);
245 set_cpuid_to_node(pa->apic_id, node);
246 node_set(node, numa_nodes_parsed);
247 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u\n", pxm, pa->apic_id, node);
250 void __init acpi_numa_arch_fixup(void) {}
253 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
255 memblock_reserve(addr, size);
258 #ifdef CONFIG_ACPI_HOTPLUG_CPU
260 #include <acpi/processor.h>
262 static int __ref acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
264 #ifdef CONFIG_ACPI_NUMA
267 nid = acpi_get_node(handle);
268 if (nid != NUMA_NO_NODE) {
269 set_cpuid_to_node(physid, nid);
270 node_set(nid, numa_nodes_parsed);
271 set_cpu_numa_node(cpu, nid);
272 cpumask_set_cpu(cpu, cpumask_of_node(nid));
278 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu)
282 cpu = set_processor_mask(physid, ACPI_MADT_ENABLED);
284 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
288 acpi_map_cpu2node(handle, cpu, physid);
294 EXPORT_SYMBOL(acpi_map_cpu);
296 int acpi_unmap_cpu(int cpu)
298 #ifdef CONFIG_ACPI_NUMA
299 set_cpuid_to_node(cpu_logical_map(cpu), NUMA_NO_NODE);
301 set_cpu_present(cpu, false);
304 pr_info("cpu%d hot remove!\n", cpu);
308 EXPORT_SYMBOL(acpi_unmap_cpu);
310 #endif /* CONFIG_ACPI_HOTPLUG_CPU */