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