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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Default generic APIC driver. This handles up to 8 CPUs.
4 *
5 * Copyright 2003 Andi Kleen, SuSE Labs.
6 *
7 * Generic x86 APIC driver probe layer.
8 */
9#include <linux/export.h>
10#include <linux/errno.h>
11#include <linux/smp.h>
12
13#include <xen/xen.h>
14
15#include <asm/io_apic.h>
16#include <asm/apic.h>
17#include <asm/acpi.h>
18
19#include "local.h"
20
21static u32 default_phys_pkg_id(u32 cpuid_apic, int index_msb)
22{
23 return cpuid_apic >> index_msb;
24}
25
26static u32 default_get_apic_id(u32 x)
27{
28 unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
29
30 if (APIC_XAPIC(ver) || boot_cpu_has(X86_FEATURE_EXTD_APICID))
31 return (x >> 24) & 0xFF;
32 else
33 return (x >> 24) & 0x0F;
34}
35
36/* should be called last. */
37static int probe_default(void)
38{
39 return 1;
40}
41
42static struct apic apic_default __ro_after_init = {
43
44 .name = "default",
45 .probe = probe_default,
46 .apic_id_registered = default_apic_id_registered,
47
48 .dest_mode_logical = true,
49
50 .disable_esr = 0,
51
52 .check_apicid_used = default_check_apicid_used,
53 .init_apic_ldr = default_init_apic_ldr,
54 .ioapic_phys_id_map = default_ioapic_phys_id_map,
55 .cpu_present_to_apicid = default_cpu_present_to_apicid,
56 .phys_pkg_id = default_phys_pkg_id,
57
58 .max_apic_id = 0xFE,
59 .get_apic_id = default_get_apic_id,
60
61 .calc_dest_apicid = apic_flat_calc_apicid,
62
63 .send_IPI = default_send_IPI_single,
64 .send_IPI_mask = default_send_IPI_mask_logical,
65 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical,
66 .send_IPI_allbutself = default_send_IPI_allbutself,
67 .send_IPI_all = default_send_IPI_all,
68 .send_IPI_self = default_send_IPI_self,
69
70 .read = native_apic_mem_read,
71 .write = native_apic_mem_write,
72 .eoi = native_apic_mem_eoi,
73 .icr_read = native_apic_icr_read,
74 .icr_write = native_apic_icr_write,
75 .wait_icr_idle = apic_mem_wait_icr_idle,
76 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout,
77};
78
79apic_driver(apic_default);
80
81struct apic *apic __ro_after_init = &apic_default;
82EXPORT_SYMBOL_GPL(apic);
83
84static int cmdline_apic __initdata;
85static int __init parse_apic(char *arg)
86{
87 struct apic **drv;
88
89 if (!arg)
90 return -EINVAL;
91
92 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
93 if (!strcmp((*drv)->name, arg)) {
94 apic_install_driver(*drv);
95 cmdline_apic = 1;
96 return 0;
97 }
98 }
99
100 /* Parsed again by __setup for debug/verbose */
101 return 0;
102}
103early_param("apic", parse_apic);
104
105void __init x86_32_probe_bigsmp_early(void)
106{
107 if (nr_cpu_ids <= 8 || xen_pv_domain())
108 return;
109
110 if (IS_ENABLED(CONFIG_X86_BIGSMP)) {
111 switch (boot_cpu_data.x86_vendor) {
112 case X86_VENDOR_INTEL:
113 if (!APIC_XAPIC(boot_cpu_apic_version))
114 break;
115 /* P4 and above */
116 fallthrough;
117 case X86_VENDOR_HYGON:
118 case X86_VENDOR_AMD:
119 if (apic_bigsmp_possible(cmdline_apic))
120 return;
121 break;
122 }
123 }
124 pr_info("Limiting to 8 possible CPUs\n");
125 set_nr_cpu_ids(8);
126}
127
128void __init x86_32_install_bigsmp(void)
129{
130 if (nr_cpu_ids > 8 && !xen_pv_domain())
131 apic_bigsmp_force();
132}
133
134void __init x86_32_probe_apic(void)
135{
136 if (!cmdline_apic) {
137 struct apic **drv;
138
139 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
140 if ((*drv)->probe()) {
141 apic_install_driver(*drv);
142 break;
143 }
144 }
145 /* Not visible without early console */
146 if (drv == __apicdrivers_end)
147 panic("Didn't find an APIC driver");
148 }
149}
1/*
2 * Default generic APIC driver. This handles up to 8 CPUs.
3 *
4 * Copyright 2003 Andi Kleen, SuSE Labs.
5 * Subject to the GNU Public License, v.2
6 *
7 * Generic x86 APIC driver probe layer.
8 */
9#include <linux/threads.h>
10#include <linux/cpumask.h>
11#include <linux/export.h>
12#include <linux/string.h>
13#include <linux/kernel.h>
14#include <linux/ctype.h>
15#include <linux/init.h>
16#include <linux/errno.h>
17#include <asm/fixmap.h>
18#include <asm/mpspec.h>
19#include <asm/apicdef.h>
20#include <asm/apic.h>
21#include <asm/setup.h>
22
23#include <linux/smp.h>
24#include <asm/ipi.h>
25
26#include <linux/interrupt.h>
27#include <asm/acpi.h>
28#include <asm/e820.h>
29
30#ifdef CONFIG_HOTPLUG_CPU
31#define DEFAULT_SEND_IPI (1)
32#else
33#define DEFAULT_SEND_IPI (0)
34#endif
35
36int no_broadcast = DEFAULT_SEND_IPI;
37
38static __init int no_ipi_broadcast(char *str)
39{
40 get_option(&str, &no_broadcast);
41 pr_info("Using %s mode\n",
42 no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
43 return 1;
44}
45__setup("no_ipi_broadcast=", no_ipi_broadcast);
46
47static int __init print_ipi_mode(void)
48{
49 pr_info("Using IPI %s mode\n",
50 no_broadcast ? "No-Shortcut" : "Shortcut");
51 return 0;
52}
53late_initcall(print_ipi_mode);
54
55static int default_x86_32_early_logical_apicid(int cpu)
56{
57 return 1 << cpu;
58}
59
60static void setup_apic_flat_routing(void)
61{
62#ifdef CONFIG_X86_IO_APIC
63 printk(KERN_INFO
64 "Enabling APIC mode: Flat. Using %d I/O APICs\n",
65 nr_ioapics);
66#endif
67}
68
69/* should be called last. */
70static int probe_default(void)
71{
72 return 1;
73}
74
75static struct apic apic_default __ro_after_init = {
76
77 .name = "default",
78 .probe = probe_default,
79 .acpi_madt_oem_check = NULL,
80 .apic_id_valid = default_apic_id_valid,
81 .apic_id_registered = default_apic_id_registered,
82
83 .irq_delivery_mode = dest_LowestPrio,
84 /* logical delivery broadcast to all CPUs: */
85 .irq_dest_mode = 1,
86
87 .target_cpus = default_target_cpus,
88 .disable_esr = 0,
89 .dest_logical = APIC_DEST_LOGICAL,
90 .check_apicid_used = default_check_apicid_used,
91
92 .vector_allocation_domain = flat_vector_allocation_domain,
93 .init_apic_ldr = default_init_apic_ldr,
94
95 .ioapic_phys_id_map = default_ioapic_phys_id_map,
96 .setup_apic_routing = setup_apic_flat_routing,
97 .cpu_present_to_apicid = default_cpu_present_to_apicid,
98 .apicid_to_cpu_present = physid_set_mask_of_physid,
99 .check_phys_apicid_present = default_check_phys_apicid_present,
100 .phys_pkg_id = default_phys_pkg_id,
101
102 .get_apic_id = default_get_apic_id,
103 .set_apic_id = NULL,
104
105 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
106
107 .send_IPI = default_send_IPI_single,
108 .send_IPI_mask = default_send_IPI_mask_logical,
109 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical,
110 .send_IPI_allbutself = default_send_IPI_allbutself,
111 .send_IPI_all = default_send_IPI_all,
112 .send_IPI_self = default_send_IPI_self,
113
114 .inquire_remote_apic = default_inquire_remote_apic,
115
116 .read = native_apic_mem_read,
117 .write = native_apic_mem_write,
118 .eoi_write = native_apic_mem_write,
119 .icr_read = native_apic_icr_read,
120 .icr_write = native_apic_icr_write,
121 .wait_icr_idle = native_apic_wait_icr_idle,
122 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
123
124 .x86_32_early_logical_apicid = default_x86_32_early_logical_apicid,
125};
126
127apic_driver(apic_default);
128
129struct apic *apic __ro_after_init = &apic_default;
130EXPORT_SYMBOL_GPL(apic);
131
132static int cmdline_apic __initdata;
133static int __init parse_apic(char *arg)
134{
135 struct apic **drv;
136
137 if (!arg)
138 return -EINVAL;
139
140 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
141 if (!strcmp((*drv)->name, arg)) {
142 apic = *drv;
143 cmdline_apic = 1;
144 return 0;
145 }
146 }
147
148 /* Parsed again by __setup for debug/verbose */
149 return 0;
150}
151early_param("apic", parse_apic);
152
153void __init default_setup_apic_routing(void)
154{
155 int version = boot_cpu_apic_version;
156
157 if (num_possible_cpus() > 8) {
158 switch (boot_cpu_data.x86_vendor) {
159 case X86_VENDOR_INTEL:
160 if (!APIC_XAPIC(version)) {
161 def_to_bigsmp = 0;
162 break;
163 }
164 /* If P4 and above fall through */
165 case X86_VENDOR_AMD:
166 def_to_bigsmp = 1;
167 }
168 }
169
170#ifdef CONFIG_X86_BIGSMP
171 /*
172 * This is used to switch to bigsmp mode when
173 * - There is no apic= option specified by the user
174 * - generic_apic_probe() has chosen apic_default as the sub_arch
175 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
176 */
177
178 if (!cmdline_apic && apic == &apic_default)
179 generic_bigsmp_probe();
180#endif
181
182 if (apic->setup_apic_routing)
183 apic->setup_apic_routing();
184
185 if (x86_platform.apic_post_init)
186 x86_platform.apic_post_init();
187}
188
189void __init generic_apic_probe(void)
190{
191 if (!cmdline_apic) {
192 struct apic **drv;
193
194 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
195 if ((*drv)->probe()) {
196 apic = *drv;
197 break;
198 }
199 }
200 /* Not visible without early console */
201 if (drv == __apicdrivers_end)
202 panic("Didn't find an APIC driver");
203 }
204 printk(KERN_INFO "Using APIC driver %s\n", apic->name);
205}
206
207/* This function can switch the APIC even after the initial ->probe() */
208int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
209{
210 struct apic **drv;
211
212 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
213 if (!(*drv)->acpi_madt_oem_check)
214 continue;
215 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
216 continue;
217
218 if (!cmdline_apic) {
219 apic = *drv;
220 printk(KERN_INFO "Switched to APIC driver `%s'.\n",
221 apic->name);
222 }
223 return 1;
224 }
225 return 0;
226}