1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright 2004 James Cleverdon, IBM.
 
  4 *
  5 * Flat APIC subarch code.
  6 *
  7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
  8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
  9 * James Cleverdon.
 10 */
 
 
 11#include <linux/cpumask.h>
 12#include <linux/export.h>
 13#include <linux/acpi.h>
 14
 15#include <asm/jailhouse_para.h>
 
 
 16#include <asm/apic.h>
 
 17
 18#include "local.h"
 19
 20static struct apic apic_physflat;
 21static struct apic apic_flat;
 22
 23struct apic *apic __ro_after_init = &apic_flat;
 24EXPORT_SYMBOL_GPL(apic);
 25
 26static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 27{
 28	return 1;
 29}
 30
 31/*
 32 * Set up the logical destination ID.
 33 *
 34 * Intel recommends to set DFR, LDR and TPR before enabling
 35 * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
 36 * document number 292116).  So here it goes...
 37 */
 38void flat_init_apic_ldr(void)
 39{
 40	unsigned long val;
 41	unsigned long num, id;
 42
 43	num = smp_processor_id();
 44	id = 1UL << num;
 45	apic_write(APIC_DFR, APIC_DFR_FLAT);
 46	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
 47	val |= SET_APIC_LOGICAL_ID(id);
 48	apic_write(APIC_LDR, val);
 49}
 50
 51static void _flat_send_IPI_mask(unsigned long mask, int vector)
 52{
 53	unsigned long flags;
 54
 55	local_irq_save(flags);
 56	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
 57	local_irq_restore(flags);
 58}
 59
 60static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 61{
 62	unsigned long mask = cpumask_bits(cpumask)[0];
 63
 64	_flat_send_IPI_mask(mask, vector);
 65}
 66
 67static void
 68flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
 69{
 70	unsigned long mask = cpumask_bits(cpumask)[0];
 71	int cpu = smp_processor_id();
 72
 73	if (cpu < BITS_PER_LONG)
 74		__clear_bit(cpu, &mask);
 75
 76	_flat_send_IPI_mask(mask, vector);
 77}
 78
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 79static unsigned int flat_get_apic_id(unsigned long x)
 80{
 81	return (x >> 24) & 0xFF;
 
 
 
 
 82}
 83
 84static u32 set_apic_id(unsigned int id)
 85{
 86	return (id & 0xFF) << 24;
 
 
 
 87}
 88
 89static unsigned int read_xapic_id(void)
 90{
 91	return flat_get_apic_id(apic_read(APIC_ID));
 
 
 
 92}
 93
 94static int flat_apic_id_registered(void)
 95{
 96	return physid_isset(read_xapic_id(), phys_cpu_present_map);
 97}
 98
 99static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
100{
101	return initial_apic_id >> index_msb;
102}
103
104static int flat_probe(void)
105{
106	return 1;
107}
108
109static struct apic apic_flat __ro_after_init = {
110	.name				= "flat",
111	.probe				= flat_probe,
112	.acpi_madt_oem_check		= flat_acpi_madt_oem_check,
113	.apic_id_valid			= default_apic_id_valid,
114	.apic_id_registered		= flat_apic_id_registered,
115
116	.irq_delivery_mode		= dest_Fixed,
117	.irq_dest_mode			= 1, /* logical */
118
 
119	.disable_esr			= 0,
120	.dest_logical			= APIC_DEST_LOGICAL,
121	.check_apicid_used		= NULL,
122
 
123	.init_apic_ldr			= flat_init_apic_ldr,
124
125	.ioapic_phys_id_map		= NULL,
126	.setup_apic_routing		= NULL,
127	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
128	.apicid_to_cpu_present		= NULL,
129	.check_phys_apicid_present	= default_check_phys_apicid_present,
130	.phys_pkg_id			= flat_phys_pkg_id,
131
132	.get_apic_id			= flat_get_apic_id,
133	.set_apic_id			= set_apic_id,
 
134
135	.calc_dest_apicid		= apic_flat_calc_apicid,
136
137	.send_IPI			= default_send_IPI_single,
138	.send_IPI_mask			= flat_send_IPI_mask,
139	.send_IPI_mask_allbutself	= flat_send_IPI_mask_allbutself,
140	.send_IPI_allbutself		= default_send_IPI_allbutself,
141	.send_IPI_all			= default_send_IPI_all,
142	.send_IPI_self			= default_send_IPI_self,
143
144	.inquire_remote_apic		= default_inquire_remote_apic,
145
146	.read				= native_apic_mem_read,
147	.write				= native_apic_mem_write,
148	.eoi_write			= native_apic_mem_write,
149	.icr_read			= native_apic_icr_read,
150	.icr_write			= native_apic_icr_write,
151	.wait_icr_idle			= native_apic_wait_icr_idle,
152	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
153};
154
155/*
156 * Physflat mode is used when there are more than 8 CPUs on a system.
157 * We cannot use logical delivery in this case because the mask
158 * overflows, so use physical mode.
159 */
160static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
161{
162#ifdef CONFIG_ACPI
163	/*
164	 * Quirk: some x86_64 machines can only use physical APIC mode
165	 * regardless of how many processors are present (x86_64 ES7000
166	 * is an example).
167	 */
168	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
169		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
170		printk(KERN_DEBUG "system APIC only can use physical flat");
171		return 1;
172	}
173
174	if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
175		printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
176		return 1;
177	}
178#endif
179
180	return 0;
181}
182
183static void physflat_init_apic_ldr(void)
184{
185	/*
186	 * LDR and DFR are not involved in physflat mode, rather:
187	 * "In physical destination mode, the destination processor is
188	 * specified by its local APIC ID [...]." (Intel SDM, 10.6.2.1)
189	 */
 
190}
191
192static int physflat_probe(void)
193{
194	if (apic == &apic_physflat || num_possible_cpus() > 8 ||
195	    jailhouse_paravirt())
196		return 1;
197
198	return 0;
199}
200
201static struct apic apic_physflat __ro_after_init = {
202
203	.name				= "physical flat",
204	.probe				= physflat_probe,
205	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
206	.apic_id_valid			= default_apic_id_valid,
207	.apic_id_registered		= flat_apic_id_registered,
208
209	.irq_delivery_mode		= dest_Fixed,
210	.irq_dest_mode			= 0, /* physical */
211
 
212	.disable_esr			= 0,
213	.dest_logical			= 0,
214	.check_apicid_used		= NULL,
215
216	.init_apic_ldr			= physflat_init_apic_ldr,
 
 
217
218	.ioapic_phys_id_map		= NULL,
219	.setup_apic_routing		= NULL,
220	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
221	.apicid_to_cpu_present		= NULL,
222	.check_phys_apicid_present	= default_check_phys_apicid_present,
223	.phys_pkg_id			= flat_phys_pkg_id,
224
225	.get_apic_id			= flat_get_apic_id,
226	.set_apic_id			= set_apic_id,
 
227
228	.calc_dest_apicid		= apic_default_calc_apicid,
229
230	.send_IPI			= default_send_IPI_single_phys,
231	.send_IPI_mask			= default_send_IPI_mask_sequence_phys,
232	.send_IPI_mask_allbutself	= default_send_IPI_mask_allbutself_phys,
233	.send_IPI_allbutself		= default_send_IPI_allbutself,
234	.send_IPI_all			= default_send_IPI_all,
235	.send_IPI_self			= default_send_IPI_self,
236
237	.inquire_remote_apic		= default_inquire_remote_apic,
238
239	.read				= native_apic_mem_read,
240	.write				= native_apic_mem_write,
241	.eoi_write			= native_apic_mem_write,
242	.icr_read			= native_apic_icr_read,
243	.icr_write			= native_apic_icr_write,
244	.wait_icr_idle			= native_apic_wait_icr_idle,
245	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
246};
247
248/*
249 * We need to check for physflat first, so this order is important.
250 */
251apic_drivers(apic_physflat, apic_flat);

 
  1/*
  2 * Copyright 2004 James Cleverdon, IBM.
  3 * Subject to the GNU Public License, v.2
  4 *
  5 * Flat APIC subarch code.
  6 *
  7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
  8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
  9 * James Cleverdon.
 10 */
 11#include <linux/errno.h>
 12#include <linux/threads.h>
 13#include <linux/cpumask.h>
 14#include <linux/string.h>
 15#include <linux/kernel.h>
 16#include <linux/ctype.h>
 17#include <linux/hardirq.h>
 18#include <linux/module.h>
 19#include <asm/smp.h>
 20#include <asm/apic.h>
 21#include <asm/ipi.h>
 22
 23#include <linux/acpi.h>
 24
 25static struct apic apic_physflat;
 26static struct apic apic_flat;
 27
 28struct apic __read_mostly *apic = &apic_flat;
 29EXPORT_SYMBOL_GPL(apic);
 30
 31static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 32{
 33	return 1;
 34}
 35
 36/*
 37 * Set up the logical destination ID.
 38 *
 39 * Intel recommends to set DFR, LDR and TPR before enabling
 40 * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
 41 * document number 292116).  So here it goes...
 42 */
 43void flat_init_apic_ldr(void)
 44{
 45	unsigned long val;
 46	unsigned long num, id;
 47
 48	num = smp_processor_id();
 49	id = 1UL << num;
 50	apic_write(APIC_DFR, APIC_DFR_FLAT);
 51	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
 52	val |= SET_APIC_LOGICAL_ID(id);
 53	apic_write(APIC_LDR, val);
 54}
 55
 56static void _flat_send_IPI_mask(unsigned long mask, int vector)
 57{
 58	unsigned long flags;
 59
 60	local_irq_save(flags);
 61	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
 62	local_irq_restore(flags);
 63}
 64
 65static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 66{
 67	unsigned long mask = cpumask_bits(cpumask)[0];
 68
 69	_flat_send_IPI_mask(mask, vector);
 70}
 71
 72static void
 73flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
 74{
 75	unsigned long mask = cpumask_bits(cpumask)[0];
 76	int cpu = smp_processor_id();
 77
 78	if (cpu < BITS_PER_LONG)
 79		clear_bit(cpu, &mask);
 80
 81	_flat_send_IPI_mask(mask, vector);
 82}
 83
 84static void flat_send_IPI_allbutself(int vector)
 85{
 86	int cpu = smp_processor_id();
 87#ifdef	CONFIG_HOTPLUG_CPU
 88	int hotplug = 1;
 89#else
 90	int hotplug = 0;
 91#endif
 92	if (hotplug || vector == NMI_VECTOR) {
 93		if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
 94			unsigned long mask = cpumask_bits(cpu_online_mask)[0];
 95
 96			if (cpu < BITS_PER_LONG)
 97				clear_bit(cpu, &mask);
 98
 99			_flat_send_IPI_mask(mask, vector);
100		}
101	} else if (num_online_cpus() > 1) {
102		__default_send_IPI_shortcut(APIC_DEST_ALLBUT,
103					    vector, apic->dest_logical);
104	}
105}
106
107static void flat_send_IPI_all(int vector)
108{
109	if (vector == NMI_VECTOR) {
110		flat_send_IPI_mask(cpu_online_mask, vector);
111	} else {
112		__default_send_IPI_shortcut(APIC_DEST_ALLINC,
113					    vector, apic->dest_logical);
114	}
115}
116
117static unsigned int flat_get_apic_id(unsigned long x)
118{
119	unsigned int id;
120
121	id = (((x)>>24) & 0xFFu);
122
123	return id;
124}
125
126static unsigned long set_apic_id(unsigned int id)
127{
128	unsigned long x;
129
130	x = ((id & 0xFFu)<<24);
131	return x;
132}
133
134static unsigned int read_xapic_id(void)
135{
136	unsigned int id;
137
138	id = flat_get_apic_id(apic_read(APIC_ID));
139	return id;
140}
141
142static int flat_apic_id_registered(void)
143{
144	return physid_isset(read_xapic_id(), phys_cpu_present_map);
145}
146
147static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
148{
149	return initial_apic_id >> index_msb;
150}
151
152static int flat_probe(void)
153{
154	return 1;
155}
156
157static struct apic apic_flat =  {
158	.name				= "flat",
159	.probe				= flat_probe,
160	.acpi_madt_oem_check		= flat_acpi_madt_oem_check,
161	.apic_id_valid			= default_apic_id_valid,
162	.apic_id_registered		= flat_apic_id_registered,
163
164	.irq_delivery_mode		= dest_LowestPrio,
165	.irq_dest_mode			= 1, /* logical */
166
167	.target_cpus			= online_target_cpus,
168	.disable_esr			= 0,
169	.dest_logical			= APIC_DEST_LOGICAL,
170	.check_apicid_used		= NULL,
171
172	.vector_allocation_domain	= flat_vector_allocation_domain,
173	.init_apic_ldr			= flat_init_apic_ldr,
174
175	.ioapic_phys_id_map		= NULL,
176	.setup_apic_routing		= NULL,
177	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
178	.apicid_to_cpu_present		= NULL,
179	.check_phys_apicid_present	= default_check_phys_apicid_present,
180	.phys_pkg_id			= flat_phys_pkg_id,
181
182	.get_apic_id			= flat_get_apic_id,
183	.set_apic_id			= set_apic_id,
184	.apic_id_mask			= 0xFFu << 24,
185
186	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
187
188	.send_IPI			= default_send_IPI_single,
189	.send_IPI_mask			= flat_send_IPI_mask,
190	.send_IPI_mask_allbutself	= flat_send_IPI_mask_allbutself,
191	.send_IPI_allbutself		= flat_send_IPI_allbutself,
192	.send_IPI_all			= flat_send_IPI_all,
193	.send_IPI_self			= apic_send_IPI_self,
194
195	.inquire_remote_apic		= default_inquire_remote_apic,
196
197	.read				= native_apic_mem_read,
198	.write				= native_apic_mem_write,
199	.eoi_write			= native_apic_mem_write,
200	.icr_read			= native_apic_icr_read,
201	.icr_write			= native_apic_icr_write,
202	.wait_icr_idle			= native_apic_wait_icr_idle,
203	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
204};
205
206/*
207 * Physflat mode is used when there are more than 8 CPUs on a system.
208 * We cannot use logical delivery in this case because the mask
209 * overflows, so use physical mode.
210 */
211static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
212{
213#ifdef CONFIG_ACPI
214	/*
215	 * Quirk: some x86_64 machines can only use physical APIC mode
216	 * regardless of how many processors are present (x86_64 ES7000
217	 * is an example).
218	 */
219	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
220		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
221		printk(KERN_DEBUG "system APIC only can use physical flat");
222		return 1;
223	}
224
225	if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
226		printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
227		return 1;
228	}
229#endif
230
231	return 0;
232}
233
234static void physflat_send_IPI_allbutself(int vector)
235{
236	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
237}
238
239static void physflat_send_IPI_all(int vector)
240{
241	default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
242}
243
244static int physflat_probe(void)
245{
246	if (apic == &apic_physflat || num_possible_cpus() > 8)
 
247		return 1;
248
249	return 0;
250}
251
252static struct apic apic_physflat =  {
253
254	.name				= "physical flat",
255	.probe				= physflat_probe,
256	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
257	.apic_id_valid			= default_apic_id_valid,
258	.apic_id_registered		= flat_apic_id_registered,
259
260	.irq_delivery_mode		= dest_Fixed,
261	.irq_dest_mode			= 0, /* physical */
262
263	.target_cpus			= online_target_cpus,
264	.disable_esr			= 0,
265	.dest_logical			= 0,
266	.check_apicid_used		= NULL,
267
268	.vector_allocation_domain	= default_vector_allocation_domain,
269	/* not needed, but shouldn't hurt: */
270	.init_apic_ldr			= flat_init_apic_ldr,
271
272	.ioapic_phys_id_map		= NULL,
273	.setup_apic_routing		= NULL,
274	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
275	.apicid_to_cpu_present		= NULL,
276	.check_phys_apicid_present	= default_check_phys_apicid_present,
277	.phys_pkg_id			= flat_phys_pkg_id,
278
279	.get_apic_id			= flat_get_apic_id,
280	.set_apic_id			= set_apic_id,
281	.apic_id_mask			= 0xFFu << 24,
282
283	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
284
285	.send_IPI			= default_send_IPI_single_phys,
286	.send_IPI_mask			= default_send_IPI_mask_sequence_phys,
287	.send_IPI_mask_allbutself	= default_send_IPI_mask_allbutself_phys,
288	.send_IPI_allbutself		= physflat_send_IPI_allbutself,
289	.send_IPI_all			= physflat_send_IPI_all,
290	.send_IPI_self			= apic_send_IPI_self,
291
292	.inquire_remote_apic		= default_inquire_remote_apic,
293
294	.read				= native_apic_mem_read,
295	.write				= native_apic_mem_write,
296	.eoi_write			= native_apic_mem_write,
297	.icr_read			= native_apic_icr_read,
298	.icr_write			= native_apic_icr_write,
299	.wait_icr_idle			= native_apic_wait_icr_idle,
300	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
301};
302
303/*
304 * We need to check for physflat first, so this order is important.
305 */
306apic_drivers(apic_physflat, apic_flat);