arch/loongarch/kernel/acpi.c

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