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 <asm/apic.h>
 14#include <asm/acpi.h>
 
 15
 16#include "local.h"
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 17
 18static int default_x86_32_early_logical_apicid(int cpu)
 19{
 20	return 1 << cpu;
 21}
 22
 23static void setup_apic_flat_routing(void)
 24{
 25#ifdef CONFIG_X86_IO_APIC
 26	printk(KERN_INFO
 27		"Enabling APIC mode:  Flat.  Using %d I/O APICs\n",
 28		nr_ioapics);
 29#endif
 30}
 31
 32static int default_apic_id_registered(void)
 33{
 34	return physid_isset(read_apic_id(), phys_cpu_present_map);
 35}
 36
 37/*
 38 * Set up the logical destination ID.  Intel recommends to set DFR, LDR and
 39 * TPR before enabling an APIC.  See e.g. "AP-388 82489DX User's Manual"
 40 * (Intel document number 292116).
 41 */
 42static void default_init_apic_ldr(void)
 43{
 44	unsigned long val;
 45
 46	apic_write(APIC_DFR, APIC_DFR_VALUE);
 47	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
 48	val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
 49	apic_write(APIC_LDR, val);
 50}
 51
 52static int default_phys_pkg_id(int cpuid_apic, int index_msb)
 53{
 54	return cpuid_apic >> index_msb;
 55}
 56
 57/* should be called last. */
 58static int probe_default(void)
 59{
 60	return 1;
 61}
 62
 63static struct apic apic_default __ro_after_init = {
 64
 65	.name				= "default",
 66	.probe				= probe_default,
 67	.acpi_madt_oem_check		= NULL,
 68	.apic_id_valid			= default_apic_id_valid,
 69	.apic_id_registered		= default_apic_id_registered,
 70
 71	.irq_delivery_mode		= dest_Fixed,
 72	/* logical delivery broadcast to all CPUs: */
 73	.irq_dest_mode			= 1,
 74
 
 75	.disable_esr			= 0,
 76	.dest_logical			= APIC_DEST_LOGICAL,
 77	.check_apicid_used		= default_check_apicid_used,
 78
 
 79	.init_apic_ldr			= default_init_apic_ldr,
 80
 81	.ioapic_phys_id_map		= default_ioapic_phys_id_map,
 82	.setup_apic_routing		= setup_apic_flat_routing,
 83	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
 84	.apicid_to_cpu_present		= physid_set_mask_of_physid,
 85	.check_phys_apicid_present	= default_check_phys_apicid_present,
 86	.phys_pkg_id			= default_phys_pkg_id,
 87
 88	.get_apic_id			= default_get_apic_id,
 89	.set_apic_id			= NULL,
 90
 91	.calc_dest_apicid		= apic_flat_calc_apicid,
 92
 93	.send_IPI			= default_send_IPI_single,
 94	.send_IPI_mask			= default_send_IPI_mask_logical,
 95	.send_IPI_mask_allbutself	= default_send_IPI_mask_allbutself_logical,
 96	.send_IPI_allbutself		= default_send_IPI_allbutself,
 97	.send_IPI_all			= default_send_IPI_all,
 98	.send_IPI_self			= default_send_IPI_self,
 99
100	.inquire_remote_apic		= default_inquire_remote_apic,
101
102	.read				= native_apic_mem_read,
103	.write				= native_apic_mem_write,
104	.eoi_write			= native_apic_mem_write,
105	.icr_read			= native_apic_icr_read,
106	.icr_write			= native_apic_icr_write,
107	.wait_icr_idle			= native_apic_wait_icr_idle,
108	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
109
110	.x86_32_early_logical_apicid	= default_x86_32_early_logical_apicid,
111};
112
113apic_driver(apic_default);
114
115struct apic *apic __ro_after_init = &apic_default;
116EXPORT_SYMBOL_GPL(apic);
117
118static int cmdline_apic __initdata;
119static int __init parse_apic(char *arg)
120{
121	struct apic **drv;
122
123	if (!arg)
124		return -EINVAL;
125
126	for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
127		if (!strcmp((*drv)->name, arg)) {
128			apic = *drv;
129			cmdline_apic = 1;
130			return 0;
131		}
132	}
133
134	/* Parsed again by __setup for debug/verbose */
135	return 0;
136}
137early_param("apic", parse_apic);
138
139void __init default_setup_apic_routing(void)
140{
141	int version = boot_cpu_apic_version;
142
143	if (num_possible_cpus() > 8) {
144		switch (boot_cpu_data.x86_vendor) {
145		case X86_VENDOR_INTEL:
146			if (!APIC_XAPIC(version)) {
147				def_to_bigsmp = 0;
148				break;
149			}
150			/* P4 and above */
151			/* fall through */
152		case X86_VENDOR_HYGON:
153		case X86_VENDOR_AMD:
154			def_to_bigsmp = 1;
155		}
156	}
157
158#ifdef CONFIG_X86_BIGSMP
159	/*
160	 * This is used to switch to bigsmp mode when
161	 * - There is no apic= option specified by the user
162	 * - generic_apic_probe() has chosen apic_default as the sub_arch
163	 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
164	 */
165
166	if (!cmdline_apic && apic == &apic_default)
167		generic_bigsmp_probe();
168#endif
169
170	if (apic->setup_apic_routing)
171		apic->setup_apic_routing();
172
173	if (x86_platform.apic_post_init)
174		x86_platform.apic_post_init();
175}
176
177void __init generic_apic_probe(void)
178{
179	if (!cmdline_apic) {
180		struct apic **drv;
181
182		for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
183			if ((*drv)->probe()) {
184				apic = *drv;
185				break;
186			}
187		}
188		/* Not visible without early console */
189		if (drv == __apicdrivers_end)
190			panic("Didn't find an APIC driver");
191	}
192	printk(KERN_INFO "Using APIC driver %s\n", apic->name);
193}
194
195/* This function can switch the APIC even after the initial ->probe() */
196int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
197{
198	struct apic **drv;
199
200	for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
201		if (!(*drv)->acpi_madt_oem_check)
202			continue;
203		if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
204			continue;
205
206		if (!cmdline_apic) {
207			apic = *drv;
208			printk(KERN_INFO "Switched to APIC driver `%s'.\n",
209			       apic->name);
210		}
211		return 1;
212	}
213	return 0;
214}

 
  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}