1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * acpi.c - Architecture-Specific Low-Level ACPI Boot Support 4 * 5 * Author: Jianmin Lv <lvjianmin@loongson.cn> 6 * Huacai Chen <chenhuacai@loongson.cn> 7 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 8 */ 9 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/of_fdt.h> 16 #include <linux/serial_core.h> 17 #include <asm/io.h> 18 #include <asm/numa.h> 19 #include <asm/loongson.h> 20 21 int acpi_disabled; 22 EXPORT_SYMBOL(acpi_disabled); 23 int acpi_noirq; 24 int acpi_pci_disabled; 25 EXPORT_SYMBOL(acpi_pci_disabled); 26 int acpi_strict = 1; /* We have no workarounds on LoongArch */ 27 int num_processors; 28 int disabled_cpus; 29 30 u64 acpi_saved_sp; 31 32 #define PREFIX "ACPI: " 33 34 struct acpi_madt_core_pic acpi_core_pic[MAX_CORE_PIC]; 35 36 void __init __iomem * __acpi_map_table(unsigned long phys, unsigned long size) 37 { 38 39 if (!phys || !size) 40 return NULL; 41 42 return early_memremap(phys, size); 43 } 44 void __init __acpi_unmap_table(void __iomem *map, unsigned long size) 45 { 46 if (!map || !size) 47 return; 48 49 early_memunmap(map, size); 50 } 51 52 void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) 53 { 54 if (!memblock_is_memory(phys)) 55 return ioremap(phys, size); 56 else 57 return ioremap_cache(phys, size); 58 } 59 60 #ifdef CONFIG_SMP 61 static int set_processor_mask(u32 id, u32 flags) 62 { 63 64 int cpu, cpuid = id; 65 66 if (num_processors >= nr_cpu_ids) { 67 pr_warn(PREFIX "nr_cpus/possible_cpus limit of %i reached." 68 " processor 0x%x ignored.\n", nr_cpu_ids, cpuid); 69 70 return -ENODEV; 71 72 } 73 if (cpuid == loongson_sysconf.boot_cpu_id) 74 cpu = 0; 75 else 76 cpu = cpumask_next_zero(-1, cpu_present_mask); 77 78 if (flags & ACPI_MADT_ENABLED) { 79 num_processors++; 80 set_cpu_possible(cpu, true); 81 set_cpu_present(cpu, true); 82 __cpu_number_map[cpuid] = cpu; 83 __cpu_logical_map[cpu] = cpuid; 84 } else 85 disabled_cpus++; 86 87 return cpu; 88 } 89 #endif 90 91 static int __init 92 acpi_parse_processor(union acpi_subtable_headers *header, const unsigned long end) 93 { 94 struct acpi_madt_core_pic *processor = NULL; 95 96 processor = (struct acpi_madt_core_pic *)header; 97 if (BAD_MADT_ENTRY(processor, end)) 98 return -EINVAL; 99 100 acpi_table_print_madt_entry(&header->common); 101 #ifdef CONFIG_SMP 102 acpi_core_pic[processor->core_id] = *processor; 103 set_processor_mask(processor->core_id, processor->flags); 104 #endif 105 106 return 0; 107 } 108 109 static int __init 110 acpi_parse_eio_master(union acpi_subtable_headers *header, const unsigned long end) 111 { 112 static int core = 0; 113 struct acpi_madt_eio_pic *eiointc = NULL; 114 115 eiointc = (struct acpi_madt_eio_pic *)header; 116 if (BAD_MADT_ENTRY(eiointc, end)) 117 return -EINVAL; 118 119 core = eiointc->node * CORES_PER_EIO_NODE; 120 set_bit(core, loongson_sysconf.cores_io_master); 121 122 return 0; 123 } 124 125 static void __init acpi_process_madt(void) 126 { 127 #ifdef CONFIG_SMP 128 int i; 129 130 for (i = 0; i < NR_CPUS; i++) { 131 __cpu_number_map[i] = -1; 132 __cpu_logical_map[i] = -1; 133 } 134 #endif 135 acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC, 136 acpi_parse_processor, MAX_CORE_PIC); 137 138 acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC, 139 acpi_parse_eio_master, MAX_IO_PICS); 140 141 loongson_sysconf.nr_cpus = num_processors; 142 } 143 144 int pptt_enabled; 145 146 int __init parse_acpi_topology(void) 147 { 148 int cpu, topology_id; 149 150 for_each_possible_cpu(cpu) { 151 topology_id = find_acpi_cpu_topology(cpu, 0); 152 if (topology_id < 0) { 153 pr_warn("Invalid BIOS PPTT\n"); 154 return -ENOENT; 155 } 156 157 if (acpi_pptt_cpu_is_thread(cpu) <= 0) 158 cpu_data[cpu].core = topology_id; 159 else { 160 topology_id = find_acpi_cpu_topology(cpu, 1); 161 if (topology_id < 0) 162 return -ENOENT; 163 164 cpu_data[cpu].core = topology_id; 165 } 166 } 167 168 pptt_enabled = 1; 169 170 return 0; 171 } 172 173 #ifndef CONFIG_SUSPEND 174 int (*acpi_suspend_lowlevel)(void); 175 #else 176 int (*acpi_suspend_lowlevel)(void) = loongarch_acpi_suspend; 177 #endif 178 179 void __init acpi_boot_table_init(void) 180 { 181 /* 182 * If acpi_disabled, bail out 183 */ 184 if (acpi_disabled) 185 goto fdt_earlycon; 186 187 /* 188 * Initialize the ACPI boot-time table parser. 189 */ 190 if (acpi_table_init()) { 191 disable_acpi(); 192 goto fdt_earlycon; 193 } 194 195 loongson_sysconf.boot_cpu_id = read_csr_cpuid(); 196 197 /* 198 * Process the Multiple APIC Description Table (MADT), if present 199 */ 200 acpi_process_madt(); 201 202 /* Do not enable ACPI SPCR console by default */ 203 acpi_parse_spcr(earlycon_acpi_spcr_enable, false); 204 205 return; 206 207 fdt_earlycon: 208 if (earlycon_acpi_spcr_enable) 209 early_init_dt_scan_chosen_stdout(); 210 } 211 212 #ifdef CONFIG_ACPI_NUMA 213 214 static __init int setup_node(int pxm) 215 { 216 return acpi_map_pxm_to_node(pxm); 217 } 218 219 /* 220 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for 221 * I/O localities since SRAT does not list them. I/O localities are 222 * not supported at this point. 223 */ 224 unsigned int numa_distance_cnt; 225 226 static inline unsigned int get_numa_distances_cnt(struct acpi_table_slit *slit) 227 { 228 return slit->locality_count; 229 } 230 231 void __init numa_set_distance(int from, int to, int distance) 232 { 233 if ((u8)distance != distance || (from == to && distance != LOCAL_DISTANCE)) { 234 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n", 235 from, to, distance); 236 return; 237 } 238 239 node_distances[from][to] = distance; 240 } 241 242 /* Callback for Proximity Domain -> CPUID mapping */ 243 void __init 244 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) 245 { 246 int pxm, node; 247 248 if (srat_disabled()) 249 return; 250 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) { 251 bad_srat(); 252 return; 253 } 254 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0) 255 return; 256 pxm = pa->proximity_domain_lo; 257 if (acpi_srat_revision >= 2) { 258 pxm |= (pa->proximity_domain_hi[0] << 8); 259 pxm |= (pa->proximity_domain_hi[1] << 16); 260 pxm |= (pa->proximity_domain_hi[2] << 24); 261 } 262 node = setup_node(pxm); 263 if (node < 0) { 264 pr_err("SRAT: Too many proximity domains %x\n", pxm); 265 bad_srat(); 266 return; 267 } 268 269 if (pa->apic_id >= CONFIG_NR_CPUS) { 270 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u skipped apicid that is too big\n", 271 pxm, pa->apic_id, node); 272 return; 273 } 274 275 early_numa_add_cpu(pa->apic_id, node); 276 277 set_cpuid_to_node(pa->apic_id, node); 278 node_set(node, numa_nodes_parsed); 279 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u\n", pxm, pa->apic_id, node); 280 } 281 282 #endif 283 284 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size) 285 { 286 memblock_reserve(addr, size); 287 } 288 289 #ifdef CONFIG_ACPI_HOTPLUG_CPU 290 291 #include <acpi/processor.h> 292 293 static int __ref acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) 294 { 295 #ifdef CONFIG_ACPI_NUMA 296 int nid; 297 298 nid = acpi_get_node(handle); 299 if (nid != NUMA_NO_NODE) { 300 set_cpuid_to_node(physid, nid); 301 node_set(nid, numa_nodes_parsed); 302 set_cpu_numa_node(cpu, nid); 303 cpumask_set_cpu(cpu, cpumask_of_node(nid)); 304 } 305 #endif 306 return 0; 307 } 308 309 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu) 310 { 311 int cpu; 312 313 cpu = set_processor_mask(physid, ACPI_MADT_ENABLED); 314 if (cpu < 0) { 315 pr_info(PREFIX "Unable to map lapic to logical cpu number\n"); 316 return cpu; 317 } 318 319 acpi_map_cpu2node(handle, cpu, physid); 320 321 *pcpu = cpu; 322 323 return 0; 324 } 325 EXPORT_SYMBOL(acpi_map_cpu); 326 327 int acpi_unmap_cpu(int cpu) 328 { 329 #ifdef CONFIG_ACPI_NUMA 330 set_cpuid_to_node(cpu_logical_map(cpu), NUMA_NO_NODE); 331 #endif 332 set_cpu_present(cpu, false); 333 num_processors--; 334 335 pr_info("cpu%d hot remove!\n", cpu); 336 337 return 0; 338 } 339 EXPORT_SYMBOL(acpi_unmap_cpu); 340 341 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 342