LXR linux/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
  23static unsigned long sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  24
  25/* All CPUs enumerated by SFI must be present and enabled */
  26static 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
  38static 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
  61static 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 */
  90int __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}
 101