arch/x86/platform/sfi/sfi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sfi.c - x86 architecture SFI support.
   4  *
   5  * Copyright (c) 2009, Intel Corporation.
   6  */
   7
   8 #define KMSG_COMPONENT "SFI"
   9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  10
  11 #include <linux/acpi.h>
  12 #include <linux/init.h>
  13 #include <linux/sfi.h>
  14 #include <linux/io.h>
  15
  16 #include <asm/irqdomain.h>
  17 #include <asm/io_apic.h>
  18 #include <asm/mpspec.h>
  19 #include <asm/setup.h>
  20 #include <asm/apic.h>
  21
  22 #ifdef CONFIG_X86_LOCAL_APIC
  23 static unsigned long sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  24
  25 /* All CPUs enumerated by SFI must be present and enabled */
  26 static void __init mp_sfi_register_lapic(u8 id)
  27 {
  28         if (MAX_LOCAL_APIC - id <= 0) {
  29                 pr_warn("Processor #%d invalid (max %d)\n", id, MAX_LOCAL_APIC);
  30                 return;
  31         }
  32
  33         pr_info("registering lapic[%d]\n", id);
  34
  35         generic_processor_info(id, GET_APIC_VERSION(apic_read(APIC_LVR)));
  36 }
  37
  38 static int __init sfi_parse_cpus(struct sfi_table_header *table)
  39 {
  40         struct sfi_table_simple *sb;
  41         struct sfi_cpu_table_entry *pentry;
  42         int i;
  43         int cpu_num;
  44
  45         sb = (struct sfi_table_simple *)table;
  46         cpu_num = SFI_GET_NUM_ENTRIES(sb, struct sfi_cpu_table_entry);
  47         pentry = (struct sfi_cpu_table_entry *)sb->pentry;
  48
  49         for (i = 0; i < cpu_num; i++) {
  50                 mp_sfi_register_lapic(pentry->apic_id);
  51                 pentry++;
  52         }
  53
  54         smp_found_config = 1;
  55         return 0;
  56 }
  57 #endif /* CONFIG_X86_LOCAL_APIC */
  58
  59 #ifdef CONFIG_X86_IO_APIC
  60
  61 static int __init sfi_parse_ioapic(struct sfi_table_header *table)
  62 {
  63         struct sfi_table_simple *sb;
  64         struct sfi_apic_table_entry *pentry;
  65         int i, num;
  66         struct ioapic_domain_cfg cfg = {
  67                 .type = IOAPIC_DOMAIN_STRICT,
  68                 .ops = &mp_ioapic_irqdomain_ops,
  69         };
  70
  71         sb = (struct sfi_table_simple *)table;
  72         num = SFI_GET_NUM_ENTRIES(sb, struct sfi_apic_table_entry);
  73         pentry = (struct sfi_apic_table_entry *)sb->pentry;
  74
  75         for (i = 0; i < num; i++) {
  76                 mp_register_ioapic(i, pentry->phys_addr, gsi_top, &cfg);
  77                 pentry++;
  78         }
  79
  80         WARN(pic_mode, KERN_WARNING
  81                 "SFI: pic_mod shouldn't be 1 when IOAPIC table is present\n");
  82         pic_mode = 0;
  83         return 0;
  84 }
  85 #endif /* CONFIG_X86_IO_APIC */
  86
  87 /*
  88  * sfi_platform_init(): register lapics & io-apics
  89  */
  90 int __init sfi_platform_init(void)
  91 {
  92 #ifdef CONFIG_X86_LOCAL_APIC
  93         register_lapic_address(sfi_lapic_addr);
  94         sfi_table_parse(SFI_SIG_CPUS, NULL, NULL, sfi_parse_cpus);
  95 #endif
  96 #ifdef CONFIG_X86_IO_APIC
  97         sfi_table_parse(SFI_SIG_APIC, NULL, NULL, sfi_parse_ioapic);
  98 #endif
  99         return 0;
 100 }