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/export.h> 14 #include <linux/irq.h> 15 #include <linux/irqdomain.h> 16 #include <linux/memblock.h> 17 #include <linux/of_fdt.h> 18 #include <linux/serial_core.h> 19 #include <linux/vmalloc.h> 20 #include <asm/io.h> 21 #include <asm/numa.h> 22 #include <asm/loongson.h> 23 24 int acpi_disabled; 25 EXPORT_SYMBOL(acpi_disabled); 26 int acpi_noirq; 27 int acpi_pci_disabled; 28 EXPORT_SYMBOL(acpi_pci_disabled); 29 int acpi_strict = 1; /* We have no workarounds on LoongArch */ 30 int num_processors; 31 int disabled_cpus; 32 33 u64 acpi_saved_sp; 34 35 #define PREFIX "ACPI: " 36 37 struct acpi_madt_core_pic acpi_core_pic[MAX_CORE_PIC]; 38 39 void __init __iomem * __acpi_map_table(unsigned long phys, unsigned long size) 40 { 41 42 if (!phys || !size) 43 return NULL; 44 45 return early_memremap(phys, size); 46 } 47 void __init __acpi_unmap_table(void __iomem *map, unsigned long size) 48 { 49 if (!map || !size) 50 return; 51 52 early_memunmap(map, size); 53 } 54 55 void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) 56 { 57 if (!memblock_is_memory(phys)) 58 return ioremap(phys, size); 59 else 60 return ioremap_cache(phys, size); 61 } 62 63 #define PIO_BASE (unsigned long)PCI_IOBASE 64 #define PIO_SIZE ALIGN(ISA_IOSIZE, PAGE_SIZE) 65 66 static bool acpi_pio; 67 68 /* Add PIO for early access */ 69 void acpi_add_early_pio(void) 70 { 71 if (!acpi_disabled) { 72 acpi_pio = true; 73 vmap_page_range(PIO_BASE, PIO_BASE + PIO_SIZE, 74 LOONGSON_LIO_BASE, pgprot_device(PAGE_KERNEL)); 75 } 76 } 77 78 /* Remove PIO for PCI register */ 79 void acpi_remove_early_pio(void) 80 { 81 if (!acpi_pio) 82 return; 83 84 if (!acpi_disabled) { 85 acpi_pio = false; 86 vunmap_range(PIO_BASE, PIO_BASE + PIO_SIZE); 87 } 88 } 89 90 #ifdef CONFIG_SMP 91 static int set_processor_mask(u32 id, u32 pass) 92 { 93 int cpu = -1, cpuid = id; 94 95 if (num_processors >= NR_CPUS) { 96 pr_warn(PREFIX "nr_cpus limit of %i reached." 97 " processor 0x%x ignored.\n", NR_CPUS, cpuid); 98 99 return -ENODEV; 100 101 } 102 103 if (cpuid == loongson_sysconf.boot_cpu_id) 104 cpu = 0; 105 106 switch (pass) { 107 case 1: /* Pass 1 handle enabled processors */ 108 if (cpu < 0) 109 cpu = find_first_zero_bit(cpumask_bits(cpu_present_mask), NR_CPUS); 110 num_processors++; 111 set_cpu_present(cpu, true); 112 break; 113 case 2: /* Pass 2 handle disabled processors */ 114 if (cpu < 0) 115 cpu = find_first_zero_bit(cpumask_bits(cpu_possible_mask), NR_CPUS); 116 disabled_cpus++; 117 break; 118 default: 119 return cpu; 120 } 121 122 set_cpu_possible(cpu, true); 123 __cpu_number_map[cpuid] = cpu; 124 __cpu_logical_map[cpu] = cpuid; 125 126 return cpu; 127 } 128 #endif 129 130 static int __init 131 acpi_parse_p1_processor(union acpi_subtable_headers *header, const unsigned long end) 132 { 133 struct acpi_madt_core_pic *processor = NULL; 134 135 processor = (struct acpi_madt_core_pic *)header; 136 if (BAD_MADT_ENTRY(processor, end)) 137 return -EINVAL; 138 139 acpi_table_print_madt_entry(&header->common); 140 #ifdef CONFIG_SMP 141 acpi_core_pic[processor->core_id] = *processor; 142 if (processor->flags & ACPI_MADT_ENABLED) 143 set_processor_mask(processor->core_id, 1); 144 #endif 145 146 return 0; 147 } 148 149 static int __init 150 acpi_parse_p2_processor(union acpi_subtable_headers *header, const unsigned long end) 151 { 152 struct acpi_madt_core_pic *processor = NULL; 153 154 processor = (struct acpi_madt_core_pic *)header; 155 if (BAD_MADT_ENTRY(processor, end)) 156 return -EINVAL; 157 158 #ifdef CONFIG_SMP 159 if (!(processor->flags & ACPI_MADT_ENABLED)) 160 set_processor_mask(processor->core_id, 2); 161 #endif 162 163 return 0; 164 } 165 static int __init 166 acpi_parse_eio_master(union acpi_subtable_headers *header, const unsigned long end) 167 { 168 static int core = 0; 169 struct acpi_madt_eio_pic *eiointc = NULL; 170 171 eiointc = (struct acpi_madt_eio_pic *)header; 172 if (BAD_MADT_ENTRY(eiointc, end)) 173 return -EINVAL; 174 175 core = eiointc->node * CORES_PER_EIO_NODE; 176 set_bit(core, loongson_sysconf.cores_io_master); 177 178 return 0; 179 } 180 181 static void __init acpi_process_madt(void) 182 { 183 #ifdef CONFIG_SMP 184 int i; 185 186 for (i = 0; i < NR_CPUS; i++) { 187 __cpu_number_map[i] = -1; 188 __cpu_logical_map[i] = -1; 189 } 190 #endif 191 acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC, 192 acpi_parse_p1_processor, MAX_CORE_PIC); 193 194 acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC, 195 acpi_parse_p2_processor, MAX_CORE_PIC); 196 197 acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC, 198 acpi_parse_eio_master, MAX_IO_PICS); 199 200 loongson_sysconf.nr_cpus = num_processors; 201 } 202 203 int pptt_enabled; 204 205 int __init parse_acpi_topology(void) 206 { 207 int cpu, topology_id; 208 209 for_each_possible_cpu(cpu) { 210 topology_id = find_acpi_cpu_topology(cpu, 0); 211 if (topology_id < 0) { 212 pr_warn("Invalid BIOS PPTT\n"); 213 return -ENOENT; 214 } 215 216 if (acpi_pptt_cpu_is_thread(cpu) <= 0) 217 cpu_data[cpu].core = topology_id; 218 else { 219 topology_id = find_acpi_cpu_topology(cpu, 1); 220 if (topology_id < 0) 221 return -ENOENT; 222 223 cpu_data[cpu].core = topology_id; 224 } 225 } 226 227 pptt_enabled = 1; 228 229 return 0; 230 } 231 232 #ifndef CONFIG_SUSPEND 233 int (*acpi_suspend_lowlevel)(void); 234 #else 235 int (*acpi_suspend_lowlevel)(void) = loongarch_acpi_suspend; 236 #endif 237 238 void __init acpi_boot_table_init(void) 239 { 240 /* 241 * If acpi_disabled, bail out 242 */ 243 if (acpi_disabled) 244 goto fdt_earlycon; 245 246 /* 247 * Initialize the ACPI boot-time table parser. 248 */ 249 if (acpi_table_init()) { 250 disable_acpi(); 251 goto fdt_earlycon; 252 } 253 254 loongson_sysconf.boot_cpu_id = read_csr_cpuid(); 255 256 /* 257 * Process the Multiple APIC Description Table (MADT), if present 258 */ 259 acpi_process_madt(); 260 261 /* Do not enable ACPI SPCR console by default */ 262 acpi_parse_spcr(earlycon_acpi_spcr_enable, false); 263 264 if (IS_ENABLED(CONFIG_ACPI_BGRT)) 265 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt); 266 267 return; 268 269 fdt_earlycon: 270 if (earlycon_acpi_spcr_enable) 271 early_init_dt_scan_chosen_stdout(); 272 } 273 274 #ifdef CONFIG_ACPI_NUMA 275 276 /* Callback for Proximity Domain -> CPUID mapping */ 277 void __init 278 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) 279 { 280 int pxm, node; 281 282 if (srat_disabled()) 283 return; 284 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) { 285 bad_srat(); 286 return; 287 } 288 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0) 289 return; 290 pxm = pa->proximity_domain_lo; 291 if (acpi_srat_revision >= 2) { 292 pxm |= (pa->proximity_domain_hi[0] << 8); 293 pxm |= (pa->proximity_domain_hi[1] << 16); 294 pxm |= (pa->proximity_domain_hi[2] << 24); 295 } 296 node = acpi_map_pxm_to_node(pxm); 297 if (node < 0) { 298 pr_err("SRAT: Too many proximity domains %x\n", pxm); 299 bad_srat(); 300 return; 301 } 302 303 if (pa->apic_id >= CONFIG_NR_CPUS) { 304 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u skipped apicid that is too big\n", 305 pxm, pa->apic_id, node); 306 return; 307 } 308 309 early_numa_add_cpu(pa->apic_id, node); 310 311 set_cpuid_to_node(pa->apic_id, node); 312 node_set(node, numa_nodes_parsed); 313 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u\n", pxm, pa->apic_id, node); 314 } 315 316 void __init 317 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) 318 { 319 int pxm, node; 320 321 if (srat_disabled()) 322 return; 323 if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) { 324 bad_srat(); 325 return; 326 } 327 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0) 328 return; 329 pxm = pa->proximity_domain; 330 node = acpi_map_pxm_to_node(pxm); 331 if (node < 0) { 332 pr_err("SRAT: Too many proximity domains %x\n", pxm); 333 bad_srat(); 334 return; 335 } 336 337 if (pa->apic_id >= CONFIG_NR_CPUS) { 338 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u skipped apicid that is too big\n", 339 pxm, pa->apic_id, node); 340 return; 341 } 342 343 early_numa_add_cpu(pa->apic_id, node); 344 345 set_cpuid_to_node(pa->apic_id, node); 346 node_set(node, numa_nodes_parsed); 347 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u\n", pxm, pa->apic_id, node); 348 } 349 350 #endif 351 352 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size) 353 { 354 memblock_reserve(addr, size); 355 } 356 357 #ifdef CONFIG_ACPI_HOTPLUG_CPU 358 359 #include <acpi/processor.h> 360 361 static int __ref acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) 362 { 363 #ifdef CONFIG_ACPI_NUMA 364 int nid; 365 366 nid = acpi_get_node(handle); 367 368 if (nid != NUMA_NO_NODE) 369 nid = early_cpu_to_node(cpu); 370 371 if (nid != NUMA_NO_NODE) { 372 set_cpuid_to_node(physid, nid); 373 node_set(nid, numa_nodes_parsed); 374 set_cpu_numa_node(cpu, nid); 375 cpumask_set_cpu(cpu, cpumask_of_node(nid)); 376 } 377 #endif 378 return 0; 379 } 380 381 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu) 382 { 383 int cpu; 384 385 cpu = cpu_number_map(physid); 386 if (cpu < 0 || cpu >= nr_cpu_ids) { 387 pr_info(PREFIX "Unable to map lapic to logical cpu number\n"); 388 return -ERANGE; 389 } 390 391 num_processors++; 392 set_cpu_present(cpu, true); 393 acpi_map_cpu2node(handle, cpu, physid); 394 395 *pcpu = cpu; 396 397 return 0; 398 } 399 EXPORT_SYMBOL(acpi_map_cpu); 400 401 int acpi_unmap_cpu(int cpu) 402 { 403 #ifdef CONFIG_ACPI_NUMA 404 set_cpuid_to_node(cpu_logical_map(cpu), NUMA_NO_NODE); 405 #endif 406 set_cpu_present(cpu, false); 407 num_processors--; 408 409 pr_info("cpu%d hot remove!\n", cpu); 410 411 return 0; 412 } 413 EXPORT_SYMBOL(acpi_unmap_cpu); 414 415 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 416 417 int acpi_get_cpu_uid(unsigned int cpu, u32 *uid) 418 { 419 if (cpu >= nr_cpu_ids) 420 return -EINVAL; 421 *uid = acpi_core_pic[cpu_logical_map(cpu)].processor_id; 422 return 0; 423 } 424 EXPORT_SYMBOL_GPL(acpi_get_cpu_uid); 425