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 */
mp_sfi_register_lapic(u8 id)26 static void __init mp_sfi_register_lapic(u8 id)
27 {
28 if (MAX_LOCAL_APIC - id <= 0) {
29 pr_warning("Processor #%d invalid (max %d)\n",
30 id, MAX_LOCAL_APIC);
31 return;
32 }
33
34 pr_info("registering lapic[%d]\n", id);
35
36 generic_processor_info(id, GET_APIC_VERSION(apic_read(APIC_LVR)));
37 }
38
sfi_parse_cpus(struct sfi_table_header * table)39 static int __init sfi_parse_cpus(struct sfi_table_header *table)
40 {
41 struct sfi_table_simple *sb;
42 struct sfi_cpu_table_entry *pentry;
43 int i;
44 int cpu_num;
45
46 sb = (struct sfi_table_simple *)table;
47 cpu_num = SFI_GET_NUM_ENTRIES(sb, struct sfi_cpu_table_entry);
48 pentry = (struct sfi_cpu_table_entry *)sb->pentry;
49
50 for (i = 0; i < cpu_num; i++) {
51 mp_sfi_register_lapic(pentry->apic_id);
52 pentry++;
53 }
54
55 smp_found_config = 1;
56 return 0;
57 }
58 #endif /* CONFIG_X86_LOCAL_APIC */
59
60 #ifdef CONFIG_X86_IO_APIC
61
sfi_parse_ioapic(struct sfi_table_header * table)62 static int __init sfi_parse_ioapic(struct sfi_table_header *table)
63 {
64 struct sfi_table_simple *sb;
65 struct sfi_apic_table_entry *pentry;
66 int i, num;
67 struct ioapic_domain_cfg cfg = {
68 .type = IOAPIC_DOMAIN_STRICT,
69 .ops = &mp_ioapic_irqdomain_ops,
70 };
71
72 sb = (struct sfi_table_simple *)table;
73 num = SFI_GET_NUM_ENTRIES(sb, struct sfi_apic_table_entry);
74 pentry = (struct sfi_apic_table_entry *)sb->pentry;
75
76 for (i = 0; i < num; i++) {
77 mp_register_ioapic(i, pentry->phys_addr, gsi_top, &cfg);
78 pentry++;
79 }
80
81 WARN(pic_mode, KERN_WARNING
82 "SFI: pic_mod shouldn't be 1 when IOAPIC table is present\n");
83 pic_mode = 0;
84 return 0;
85 }
86 #endif /* CONFIG_X86_IO_APIC */
87
88 /*
89 * sfi_platform_init(): register lapics & io-apics
90 */
sfi_platform_init(void)91 int __init sfi_platform_init(void)
92 {
93 #ifdef CONFIG_X86_LOCAL_APIC
94 register_lapic_address(sfi_lapic_addr);
95 sfi_table_parse(SFI_SIG_CPUS, NULL, NULL, sfi_parse_cpus);
96 #endif
97 #ifdef CONFIG_X86_IO_APIC
98 sfi_table_parse(SFI_SIG_APIC, NULL, NULL, sfi_parse_ioapic);
99 #endif
100 return 0;
101 }
102
