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
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 31static void _flat_send_IPI_mask(unsigned long mask, int vector)
 32{
 33	unsigned long flags;
 34
 35	local_irq_save(flags);
 36	__default_send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL);
 37	local_irq_restore(flags);
 38}
 39
 40static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 41{
 42	unsigned long mask = cpumask_bits(cpumask)[0];
 43
 44	_flat_send_IPI_mask(mask, vector);
 45}
 46
 47static void
 48flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
 49{
 50	unsigned long mask = cpumask_bits(cpumask)[0];
 51	int cpu = smp_processor_id();
 52
 53	if (cpu < BITS_PER_LONG)
 54		__clear_bit(cpu, &mask);
 55
 56	_flat_send_IPI_mask(mask, vector);
 57}
 58
 59static u32 flat_get_apic_id(u32 x)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 60{
 61	return (x >> 24) & 0xFF;
 62}
 63
 64static u32 set_apic_id(u32 id)
 65{
 66	return (id & 0xFF) << 24;
 67}
 68
 69static u32 flat_phys_pkg_id(u32 initial_apic_id, int index_msb)
 
 
 
 
 
 
 
 
 
 
 70{
 71	return initial_apic_id >> index_msb;
 72}
 73
 74static int flat_probe(void)
 75{
 76	return 1;
 77}
 78
 79static struct apic apic_flat __ro_after_init = {
 80	.name				= "flat",
 81	.probe				= flat_probe,
 82	.acpi_madt_oem_check		= flat_acpi_madt_oem_check,
 83	.apic_id_registered		= default_apic_id_registered,
 
 84
 85	.dest_mode_logical		= true,
 
 86
 87	.disable_esr			= 0,
 
 
 
 
 88
 89	.init_apic_ldr			= default_init_apic_ldr,
 
 90	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
 
 
 91	.phys_pkg_id			= flat_phys_pkg_id,
 92
 93	.max_apic_id			= 0xFE,
 94	.get_apic_id			= flat_get_apic_id,
 95	.set_apic_id			= set_apic_id,
 96
 97	.calc_dest_apicid		= apic_flat_calc_apicid,
 98
 99	.send_IPI			= default_send_IPI_single,
100	.send_IPI_mask			= flat_send_IPI_mask,
101	.send_IPI_mask_allbutself	= flat_send_IPI_mask_allbutself,
102	.send_IPI_allbutself		= default_send_IPI_allbutself,
103	.send_IPI_all			= default_send_IPI_all,
104	.send_IPI_self			= default_send_IPI_self,
105	.nmi_to_offline_cpu		= true,
 
106
107	.read				= native_apic_mem_read,
108	.write				= native_apic_mem_write,
109	.eoi				= native_apic_mem_eoi,
110	.icr_read			= native_apic_icr_read,
111	.icr_write			= native_apic_icr_write,
112	.wait_icr_idle			= apic_mem_wait_icr_idle,
113	.safe_wait_icr_idle		= apic_mem_wait_icr_idle_timeout,
114};
115
116/*
117 * Physflat mode is used when there are more than 8 CPUs on a system.
118 * We cannot use logical delivery in this case because the mask
119 * overflows, so use physical mode.
120 */
121static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
122{
123#ifdef CONFIG_ACPI
124	/*
125	 * Quirk: some x86_64 machines can only use physical APIC mode
126	 * regardless of how many processors are present (x86_64 ES7000
127	 * is an example).
128	 */
129	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
130		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
131		printk(KERN_DEBUG "system APIC only can use physical flat");
132		return 1;
133	}
134
135	if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
136		printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
137		return 1;
138	}
139#endif
140
141	return 0;
142}
143
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
144static int physflat_probe(void)
145{
146	return apic == &apic_physflat || num_possible_cpus() > 8 || jailhouse_paravirt();
 
 
 
 
147}
148
149static struct apic apic_physflat __ro_after_init = {
150
151	.name				= "physical flat",
152	.probe				= physflat_probe,
153	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
154	.apic_id_registered		= default_apic_id_registered,
 
155
156	.dest_mode_logical		= false,
 
157
158	.disable_esr			= 0,
 
 
159
 
 
 
 
160	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
 
 
161	.phys_pkg_id			= flat_phys_pkg_id,
162
163	.max_apic_id			= 0xFE,
164	.get_apic_id			= flat_get_apic_id,
165	.set_apic_id			= set_apic_id,
166
167	.calc_dest_apicid		= apic_default_calc_apicid,
168
169	.send_IPI			= default_send_IPI_single_phys,
170	.send_IPI_mask			= default_send_IPI_mask_sequence_phys,
171	.send_IPI_mask_allbutself	= default_send_IPI_mask_allbutself_phys,
172	.send_IPI_allbutself		= default_send_IPI_allbutself,
173	.send_IPI_all			= default_send_IPI_all,
174	.send_IPI_self			= default_send_IPI_self,
175	.nmi_to_offline_cpu		= true,
 
176
177	.read				= native_apic_mem_read,
178	.write				= native_apic_mem_write,
179	.eoi				= native_apic_mem_eoi,
180	.icr_read			= native_apic_icr_read,
181	.icr_write			= native_apic_icr_write,
182	.wait_icr_idle			= apic_mem_wait_icr_idle,
183	.safe_wait_icr_idle		= apic_mem_wait_icr_idle_timeout,
184};
185
186/*
187 * We need to check for physflat first, so this order is important.
188 */
189apic_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/export.h>
 19#include <asm/smp.h>
 
 
 20#include <asm/apic.h>
 21#include <asm/ipi.h>
 22#include <asm/jailhouse_para.h>
 23
 24#include <linux/acpi.h>
 25
 26static struct apic apic_physflat;
 27static struct apic apic_flat;
 28
 29struct apic *apic __ro_after_init = &apic_flat;
 30EXPORT_SYMBOL_GPL(apic);
 31
 32static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 33{
 34	return 1;
 35}
 36
 37/*
 38 * Set up the logical destination ID.
 39 *
 40 * Intel recommends to set DFR, LDR and TPR before enabling
 41 * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
 42 * document number 292116).  So here it goes...
 43 */
 44void flat_init_apic_ldr(void)
 45{
 46	unsigned long val;
 47	unsigned long num, id;
 48
 49	num = smp_processor_id();
 50	id = 1UL << num;
 51	apic_write(APIC_DFR, APIC_DFR_FLAT);
 52	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
 53	val |= SET_APIC_LOGICAL_ID(id);
 54	apic_write(APIC_LDR, val);
 55}
 56
 57static void _flat_send_IPI_mask(unsigned long mask, int vector)
 58{
 59	unsigned long flags;
 60
 61	local_irq_save(flags);
 62	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
 63	local_irq_restore(flags);
 64}
 65
 66static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 67{
 68	unsigned long mask = cpumask_bits(cpumask)[0];
 69
 70	_flat_send_IPI_mask(mask, vector);
 71}
 72
 73static void
 74flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
 75{
 76	unsigned long mask = cpumask_bits(cpumask)[0];
 77	int cpu = smp_processor_id();
 78
 79	if (cpu < BITS_PER_LONG)
 80		clear_bit(cpu, &mask);
 81
 82	_flat_send_IPI_mask(mask, vector);
 83}
 84
 85static void flat_send_IPI_allbutself(int vector)
 86{
 87	int cpu = smp_processor_id();
 88
 89	if (IS_ENABLED(CONFIG_HOTPLUG_CPU) || vector == NMI_VECTOR) {
 90		if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
 91			unsigned long mask = cpumask_bits(cpu_online_mask)[0];
 92
 93			if (cpu < BITS_PER_LONG)
 94				clear_bit(cpu, &mask);
 95
 96			_flat_send_IPI_mask(mask, vector);
 97		}
 98	} else if (num_online_cpus() > 1) {
 99		__default_send_IPI_shortcut(APIC_DEST_ALLBUT,
100					    vector, apic->dest_logical);
101	}
102}
103
104static void flat_send_IPI_all(int vector)
105{
106	if (vector == NMI_VECTOR) {
107		flat_send_IPI_mask(cpu_online_mask, vector);
108	} else {
109		__default_send_IPI_shortcut(APIC_DEST_ALLINC,
110					    vector, apic->dest_logical);
111	}
112}
113
114static unsigned int flat_get_apic_id(unsigned long x)
115{
116	return (x >> 24) & 0xFF;
117}
118
119static u32 set_apic_id(unsigned int id)
120{
121	return (id & 0xFF) << 24;
122}
123
124static unsigned int read_xapic_id(void)
125{
126	return flat_get_apic_id(apic_read(APIC_ID));
127}
128
129static int flat_apic_id_registered(void)
130{
131	return physid_isset(read_xapic_id(), phys_cpu_present_map);
132}
133
134static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
135{
136	return initial_apic_id >> index_msb;
137}
138
139static int flat_probe(void)
140{
141	return 1;
142}
143
144static struct apic apic_flat __ro_after_init = {
145	.name				= "flat",
146	.probe				= flat_probe,
147	.acpi_madt_oem_check		= flat_acpi_madt_oem_check,
148	.apic_id_valid			= default_apic_id_valid,
149	.apic_id_registered		= flat_apic_id_registered,
150
151	.irq_delivery_mode		= dest_Fixed,
152	.irq_dest_mode			= 1, /* logical */
153
154	.disable_esr			= 0,
155	.dest_logical			= APIC_DEST_LOGICAL,
156	.check_apicid_used		= NULL,
157
158	.init_apic_ldr			= flat_init_apic_ldr,
159
160	.ioapic_phys_id_map		= NULL,
161	.setup_apic_routing		= NULL,
162	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
163	.apicid_to_cpu_present		= NULL,
164	.check_phys_apicid_present	= default_check_phys_apicid_present,
165	.phys_pkg_id			= flat_phys_pkg_id,
166
 
167	.get_apic_id			= flat_get_apic_id,
168	.set_apic_id			= set_apic_id,
169
170	.calc_dest_apicid		= apic_flat_calc_apicid,
171
172	.send_IPI			= default_send_IPI_single,
173	.send_IPI_mask			= flat_send_IPI_mask,
174	.send_IPI_mask_allbutself	= flat_send_IPI_mask_allbutself,
175	.send_IPI_allbutself		= flat_send_IPI_allbutself,
176	.send_IPI_all			= flat_send_IPI_all,
177	.send_IPI_self			= apic_send_IPI_self,
178
179	.inquire_remote_apic		= default_inquire_remote_apic,
180
181	.read				= native_apic_mem_read,
182	.write				= native_apic_mem_write,
183	.eoi_write			= native_apic_mem_write,
184	.icr_read			= native_apic_icr_read,
185	.icr_write			= native_apic_icr_write,
186	.wait_icr_idle			= native_apic_wait_icr_idle,
187	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
188};
189
190/*
191 * Physflat mode is used when there are more than 8 CPUs on a system.
192 * We cannot use logical delivery in this case because the mask
193 * overflows, so use physical mode.
194 */
195static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
196{
197#ifdef CONFIG_ACPI
198	/*
199	 * Quirk: some x86_64 machines can only use physical APIC mode
200	 * regardless of how many processors are present (x86_64 ES7000
201	 * is an example).
202	 */
203	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
204		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
205		printk(KERN_DEBUG "system APIC only can use physical flat");
206		return 1;
207	}
208
209	if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
210		printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
211		return 1;
212	}
213#endif
214
215	return 0;
216}
217
218static void physflat_init_apic_ldr(void)
219{
220	/*
221	 * LDR and DFR are not involved in physflat mode, rather:
222	 * "In physical destination mode, the destination processor is
223	 * specified by its local APIC ID [...]." (Intel SDM, 10.6.2.1)
224	 */
225}
226
227static void physflat_send_IPI_allbutself(int vector)
228{
229	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
230}
231
232static void physflat_send_IPI_all(int vector)
233{
234	default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
235}
236
237static int physflat_probe(void)
238{
239	if (apic == &apic_physflat || num_possible_cpus() > 8 ||
240	    jailhouse_paravirt())
241		return 1;
242
243	return 0;
244}
245
246static struct apic apic_physflat __ro_after_init = {
247
248	.name				= "physical flat",
249	.probe				= physflat_probe,
250	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
251	.apic_id_valid			= default_apic_id_valid,
252	.apic_id_registered		= flat_apic_id_registered,
253
254	.irq_delivery_mode		= dest_Fixed,
255	.irq_dest_mode			= 0, /* physical */
256
257	.disable_esr			= 0,
258	.dest_logical			= 0,
259	.check_apicid_used		= NULL,
260
261	.init_apic_ldr			= physflat_init_apic_ldr,
262
263	.ioapic_phys_id_map		= NULL,
264	.setup_apic_routing		= NULL,
265	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
266	.apicid_to_cpu_present		= NULL,
267	.check_phys_apicid_present	= default_check_phys_apicid_present,
268	.phys_pkg_id			= flat_phys_pkg_id,
269
 
270	.get_apic_id			= flat_get_apic_id,
271	.set_apic_id			= set_apic_id,
272
273	.calc_dest_apicid		= apic_default_calc_apicid,
274
275	.send_IPI			= default_send_IPI_single_phys,
276	.send_IPI_mask			= default_send_IPI_mask_sequence_phys,
277	.send_IPI_mask_allbutself	= default_send_IPI_mask_allbutself_phys,
278	.send_IPI_allbutself		= physflat_send_IPI_allbutself,
279	.send_IPI_all			= physflat_send_IPI_all,
280	.send_IPI_self			= apic_send_IPI_self,
281
282	.inquire_remote_apic		= default_inquire_remote_apic,
283
284	.read				= native_apic_mem_read,
285	.write				= native_apic_mem_write,
286	.eoi_write			= native_apic_mem_write,
287	.icr_read			= native_apic_icr_read,
288	.icr_write			= native_apic_icr_write,
289	.wait_icr_idle			= native_apic_wait_icr_idle,
290	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
291};
292
293/*
294 * We need to check for physflat first, so this order is important.
295 */
296apic_drivers(apic_physflat, apic_flat);