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_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
sfi_parse_cpus(struct sfi_table_header * table)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
sfi_parse_ioapic(struct sfi_table_header * table)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 */
sfi_platform_init(void)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 }
101