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/efi-bgrt.h> 13 #include <linux/irq.h> 14 #include <linux/irqdomain.h> 15 #include <linux/memblock.h> 16 #include <linux/of_fdt.h> 17 #include <linux/serial_core.h> 18 #include <asm/io.h> 19 #include <asm/numa.h> 20 #include <asm/loongson.h> 21 22 int acpi_disabled; 23 EXPORT_SYMBOL(acpi_disabled); 24 int acpi_noirq; 25 int acpi_pci_disabled; 26 EXPORT_SYMBOL(acpi_pci_disabled); 27 int acpi_strict = 1; /* We have no workarounds on LoongArch */ 28 int num_processors; 29 int disabled_cpus; 30 31 u64 acpi_saved_sp; 32 33 #define PREFIX "ACPI: " 34 35 struct acpi_madt_core_pic acpi_core_pic[MAX_CORE_PIC]; 36 37 void __init __iomem * __acpi_map_table(unsigned long phys, unsigned long size) 38 { 39 40 if (!phys || !size) 41 return NULL; 42 43 return early_memremap(phys, size); 44 } 45 void __init __acpi_unmap_table(void __iomem *map, unsigned long size) 46 { 47 if (!map || !size) 48 return; 49 50 early_memunmap(map, size); 51 } 52 53 void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) 54 { 55 if (!memblock_is_memory(phys)) 56 return ioremap(phys, size); 57 else 58 return ioremap_cache(phys, size); 59 } 60 61 static int cpu_enumerated = 0; 62 63 #ifdef CONFIG_SMP 64 static int set_processor_mask(u32 id, u32 flags) 65 { 66 int nr_cpus; 67 int cpu, cpuid = id; 68 69 if (!cpu_enumerated) 70 nr_cpus = NR_CPUS; 71 else 72 nr_cpus = nr_cpu_ids; 73 74 if (num_processors >= nr_cpus) { 75 pr_warn(PREFIX "nr_cpus limit of %i reached." 76 " processor 0x%x ignored.\n", nr_cpus, cpuid); 77 78 return -ENODEV; 79 80 } 81 if (cpuid == loongson_sysconf.boot_cpu_id) 82 cpu = 0; 83 else 84 cpu = find_first_zero_bit(cpumask_bits(cpu_present_mask), NR_CPUS); 85 86 if (!cpu_enumerated) 87 set_cpu_possible(cpu, true); 88 89 if (flags & ACPI_MADT_ENABLED) { 90 num_processors++; 91 set_cpu_present(cpu, true); 92 __cpu_number_map[cpuid] = cpu; 93 __cpu_logical_map[cpu] = cpuid; 94 } else 95 disabled_cpus++; 96 97 return cpu; 98 } 99 #endif 100 101 static int __init 102 acpi_parse_processor(union acpi_subtable_headers *header, const unsigned long end) 103 { 104 struct acpi_madt_core_pic *processor = NULL; 105 106 processor = (struct acpi_madt_core_pic *)header; 107 if (BAD_MADT_ENTRY(processor, end)) 108 return -EINVAL; 109 110 acpi_table_print_madt_entry(&header->common); 111 #ifdef CONFIG_SMP 112 acpi_core_pic[processor->core_id] = *processor; 113 set_processor_mask(processor->core_id, processor->flags); 114 #endif 115 116 return 0; 117 } 118 119 static int __init 120 acpi_parse_eio_master(union acpi_subtable_headers *header, const unsigned long end) 121 { 122 static int core = 0; 123 struct acpi_madt_eio_pic *eiointc = NULL; 124 125 eiointc = (struct acpi_madt_eio_pic *)header; 126 if (BAD_MADT_ENTRY(eiointc, end)) 127 return -EINVAL; 128 129 core = eiointc->node * CORES_PER_EIO_NODE; 130 set_bit(core, loongson_sysconf.cores_io_master); 131 132 return 0; 133 } 134 135 static void __init acpi_process_madt(void) 136 { 137 #ifdef CONFIG_SMP 138 int i; 139 140 for (i = 0; i < NR_CPUS; i++) { 141 __cpu_number_map[i] = -1; 142 __cpu_logical_map[i] = -1; 143 } 144 #endif 145 acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC, 146 acpi_parse_processor, MAX_CORE_PIC); 147 148 acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC, 149 acpi_parse_eio_master, MAX_IO_PICS); 150 151 cpu_enumerated = 1; 152 loongson_sysconf.nr_cpus = num_processors; 153 } 154 155 int pptt_enabled; 156 157 int __init parse_acpi_topology(void) 158 { 159 int cpu, topology_id; 160 161 for_each_possible_cpu(cpu) { 162 topology_id = find_acpi_cpu_topology(cpu, 0); 163 if (topology_id < 0) { 164 pr_warn("Invalid BIOS PPTT\n"); 165 return -ENOENT; 166 } 167 168 if (acpi_pptt_cpu_is_thread(cpu) <= 0) 169 cpu_data[cpu].core = topology_id; 170 else { 171 topology_id = find_acpi_cpu_topology(cpu, 1); 172 if (topology_id < 0) 173 return -ENOENT; 174 175 cpu_data[cpu].core = topology_id; 176 } 177 } 178 179 pptt_enabled = 1; 180 181 return 0; 182 } 183 184 #ifndef CONFIG_SUSPEND 185 int (*acpi_suspend_lowlevel)(void); 186 #else 187 int (*acpi_suspend_lowlevel)(void) = loongarch_acpi_suspend; 188 #endif 189 190 void __init acpi_boot_table_init(void) 191 { 192 /* 193 * If acpi_disabled, bail out 194 */ 195 if (acpi_disabled) 196 goto fdt_earlycon; 197 198 /* 199 * Initialize the ACPI boot-time table parser. 200 */ 201 if (acpi_table_init()) { 202 disable_acpi(); 203 goto fdt_earlycon; 204 } 205 206 loongson_sysconf.boot_cpu_id = read_csr_cpuid(); 207 208 /* 209 * Process the Multiple APIC Description Table (MADT), if present 210 */ 211 acpi_process_madt(); 212 213 /* Do not enable ACPI SPCR console by default */ 214 acpi_parse_spcr(earlycon_acpi_spcr_enable, false); 215 216 if (IS_ENABLED(CONFIG_ACPI_BGRT)) 217 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt); 218 219 return; 220 221 fdt_earlycon: 222 if (earlycon_acpi_spcr_enable) 223 early_init_dt_scan_chosen_stdout(); 224 } 225 226 #ifdef CONFIG_ACPI_NUMA 227 228 static __init int setup_node(int pxm) 229 { 230 return acpi_map_pxm_to_node(pxm); 231 } 232 233 /* 234 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for 235 * I/O localities since SRAT does not list them. I/O localities are 236 * not supported at this point. 237 */ 238 unsigned int numa_distance_cnt; 239 240 static inline unsigned int get_numa_distances_cnt(struct acpi_table_slit *slit) 241 { 242 return slit->locality_count; 243 } 244 245 void __init numa_set_distance(int from, int to, int distance) 246 { 247 if ((u8)distance != distance || (from == to && distance != LOCAL_DISTANCE)) { 248 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n", 249 from, to, distance); 250 return; 251 } 252 253 node_distances[from][to] = distance; 254 } 255 256 /* Callback for Proximity Domain -> CPUID mapping */ 257 void __init 258 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) 259 { 260 int pxm, node; 261 262 if (srat_disabled()) 263 return; 264 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) { 265 bad_srat(); 266 return; 267 } 268 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0) 269 return; 270 pxm = pa->proximity_domain_lo; 271 if (acpi_srat_revision >= 2) { 272 pxm |= (pa->proximity_domain_hi[0] << 8); 273 pxm |= (pa->proximity_domain_hi[1] << 16); 274 pxm |= (pa->proximity_domain_hi[2] << 24); 275 } 276 node = setup_node(pxm); 277 if (node < 0) { 278 pr_err("SRAT: Too many proximity domains %x\n", pxm); 279 bad_srat(); 280 return; 281 } 282 283 if (pa->apic_id >= CONFIG_NR_CPUS) { 284 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u skipped apicid that is too big\n", 285 pxm, pa->apic_id, node); 286 return; 287 } 288 289 early_numa_add_cpu(pa->apic_id, node); 290 291 set_cpuid_to_node(pa->apic_id, node); 292 node_set(node, numa_nodes_parsed); 293 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u\n", pxm, pa->apic_id, node); 294 } 295 296 #endif 297 298 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size) 299 { 300 memblock_reserve(addr, size); 301 } 302 303 #ifdef CONFIG_ACPI_HOTPLUG_CPU 304 305 #include <acpi/processor.h> 306 307 static int __ref acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) 308 { 309 #ifdef CONFIG_ACPI_NUMA 310 int nid; 311 312 nid = acpi_get_node(handle); 313 if (nid != NUMA_NO_NODE) { 314 set_cpuid_to_node(physid, nid); 315 node_set(nid, numa_nodes_parsed); 316 set_cpu_numa_node(cpu, nid); 317 cpumask_set_cpu(cpu, cpumask_of_node(nid)); 318 } 319 #endif 320 return 0; 321 } 322 323 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu) 324 { 325 int cpu; 326 327 cpu = set_processor_mask(physid, ACPI_MADT_ENABLED); 328 if (cpu < 0) { 329 pr_info(PREFIX "Unable to map lapic to logical cpu number\n"); 330 return cpu; 331 } 332 333 acpi_map_cpu2node(handle, cpu, physid); 334 335 *pcpu = cpu; 336 337 return 0; 338 } 339 EXPORT_SYMBOL(acpi_map_cpu); 340 341 int acpi_unmap_cpu(int cpu) 342 { 343 #ifdef CONFIG_ACPI_NUMA 344 set_cpuid_to_node(cpu_logical_map(cpu), NUMA_NO_NODE); 345 #endif 346 set_cpu_present(cpu, false); 347 num_processors--; 348 349 pr_info("cpu%d hot remove!\n", cpu); 350 351 return 0; 352 } 353 EXPORT_SYMBOL(acpi_unmap_cpu); 354 355 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 356