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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/api.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
69static int default_apic_id_registered(void)
70{
71 return physid_isset(read_apic_id(), phys_cpu_present_map);
72}
73
74/*
75 * Set up the logical destination ID. Intel recommends to set DFR, LDR and
76 * TPR before enabling an APIC. See e.g. "AP-388 82489DX User's Manual"
77 * (Intel document number 292116).
78 */
79static void default_init_apic_ldr(void)
80{
81 unsigned long val;
82
83 apic_write(APIC_DFR, APIC_DFR_VALUE);
84 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
85 val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
86 apic_write(APIC_LDR, val);
87}
88
89static int default_phys_pkg_id(int cpuid_apic, int index_msb)
90{
91 return cpuid_apic >> index_msb;
92}
93
94/* should be called last. */
95static int probe_default(void)
96{
97 return 1;
98}
99
100static struct apic apic_default __ro_after_init = {
101
102 .name = "default",
103 .probe = probe_default,
104 .acpi_madt_oem_check = NULL,
105 .apic_id_valid = default_apic_id_valid,
106 .apic_id_registered = default_apic_id_registered,
107
108 .irq_delivery_mode = dest_Fixed,
109 /* logical delivery broadcast to all CPUs: */
110 .irq_dest_mode = 1,
111
112 .disable_esr = 0,
113 .dest_logical = APIC_DEST_LOGICAL,
114 .check_apicid_used = default_check_apicid_used,
115
116 .init_apic_ldr = default_init_apic_ldr,
117
118 .ioapic_phys_id_map = default_ioapic_phys_id_map,
119 .setup_apic_routing = setup_apic_flat_routing,
120 .cpu_present_to_apicid = default_cpu_present_to_apicid,
121 .apicid_to_cpu_present = physid_set_mask_of_physid,
122 .check_phys_apicid_present = default_check_phys_apicid_present,
123 .phys_pkg_id = default_phys_pkg_id,
124
125 .get_apic_id = default_get_apic_id,
126 .set_apic_id = NULL,
127
128 .calc_dest_apicid = apic_flat_calc_apicid,
129
130 .send_IPI = default_send_IPI_single,
131 .send_IPI_mask = default_send_IPI_mask_logical,
132 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical,
133 .send_IPI_allbutself = default_send_IPI_allbutself,
134 .send_IPI_all = default_send_IPI_all,
135 .send_IPI_self = default_send_IPI_self,
136
137 .inquire_remote_apic = default_inquire_remote_apic,
138
139 .read = native_apic_mem_read,
140 .write = native_apic_mem_write,
141 .eoi_write = native_apic_mem_write,
142 .icr_read = native_apic_icr_read,
143 .icr_write = native_apic_icr_write,
144 .wait_icr_idle = native_apic_wait_icr_idle,
145 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
146
147 .x86_32_early_logical_apicid = default_x86_32_early_logical_apicid,
148};
149
150apic_driver(apic_default);
151
152struct apic *apic __ro_after_init = &apic_default;
153EXPORT_SYMBOL_GPL(apic);
154
155static int cmdline_apic __initdata;
156static int __init parse_apic(char *arg)
157{
158 struct apic **drv;
159
160 if (!arg)
161 return -EINVAL;
162
163 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
164 if (!strcmp((*drv)->name, arg)) {
165 apic = *drv;
166 cmdline_apic = 1;
167 return 0;
168 }
169 }
170
171 /* Parsed again by __setup for debug/verbose */
172 return 0;
173}
174early_param("apic", parse_apic);
175
176void __init default_setup_apic_routing(void)
177{
178 int version = boot_cpu_apic_version;
179
180 if (num_possible_cpus() > 8) {
181 switch (boot_cpu_data.x86_vendor) {
182 case X86_VENDOR_INTEL:
183 if (!APIC_XAPIC(version)) {
184 def_to_bigsmp = 0;
185 break;
186 }
187 /* If P4 and above fall through */
188 case X86_VENDOR_AMD:
189 def_to_bigsmp = 1;
190 }
191 }
192
193#ifdef CONFIG_X86_BIGSMP
194 /*
195 * This is used to switch to bigsmp mode when
196 * - There is no apic= option specified by the user
197 * - generic_apic_probe() has chosen apic_default as the sub_arch
198 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
199 */
200
201 if (!cmdline_apic && apic == &apic_default)
202 generic_bigsmp_probe();
203#endif
204
205 if (apic->setup_apic_routing)
206 apic->setup_apic_routing();
207
208 if (x86_platform.apic_post_init)
209 x86_platform.apic_post_init();
210}
211
212void __init generic_apic_probe(void)
213{
214 if (!cmdline_apic) {
215 struct apic **drv;
216
217 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
218 if ((*drv)->probe()) {
219 apic = *drv;
220 break;
221 }
222 }
223 /* Not visible without early console */
224 if (drv == __apicdrivers_end)
225 panic("Didn't find an APIC driver");
226 }
227 printk(KERN_INFO "Using APIC driver %s\n", apic->name);
228}
229
230/* This function can switch the APIC even after the initial ->probe() */
231int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
232{
233 struct apic **drv;
234
235 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
236 if (!(*drv)->acpi_madt_oem_check)
237 continue;
238 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
239 continue;
240
241 if (!cmdline_apic) {
242 apic = *drv;
243 printk(KERN_INFO "Switched to APIC driver `%s'.\n",
244 apic->name);
245 }
246 return 1;
247 }
248 return 0;
249}
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}