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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 .delivery_mode = APIC_DELIVERY_MODE_FIXED,
117 .dest_mode_logical = true,
118
119 .disable_esr = 0,
120
121 .check_apicid_used = NULL,
122 .init_apic_ldr = flat_init_apic_ldr,
123 .ioapic_phys_id_map = NULL,
124 .setup_apic_routing = NULL,
125 .cpu_present_to_apicid = default_cpu_present_to_apicid,
126 .apicid_to_cpu_present = NULL,
127 .check_phys_apicid_present = default_check_phys_apicid_present,
128 .phys_pkg_id = flat_phys_pkg_id,
129
130 .get_apic_id = flat_get_apic_id,
131 .set_apic_id = set_apic_id,
132
133 .calc_dest_apicid = apic_flat_calc_apicid,
134
135 .send_IPI = default_send_IPI_single,
136 .send_IPI_mask = flat_send_IPI_mask,
137 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
138 .send_IPI_allbutself = default_send_IPI_allbutself,
139 .send_IPI_all = default_send_IPI_all,
140 .send_IPI_self = default_send_IPI_self,
141
142 .inquire_remote_apic = default_inquire_remote_apic,
143
144 .read = native_apic_mem_read,
145 .write = native_apic_mem_write,
146 .eoi_write = native_apic_mem_write,
147 .icr_read = native_apic_icr_read,
148 .icr_write = native_apic_icr_write,
149 .wait_icr_idle = native_apic_wait_icr_idle,
150 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
151};
152
153/*
154 * Physflat mode is used when there are more than 8 CPUs on a system.
155 * We cannot use logical delivery in this case because the mask
156 * overflows, so use physical mode.
157 */
158static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
159{
160#ifdef CONFIG_ACPI
161 /*
162 * Quirk: some x86_64 machines can only use physical APIC mode
163 * regardless of how many processors are present (x86_64 ES7000
164 * is an example).
165 */
166 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
167 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
168 printk(KERN_DEBUG "system APIC only can use physical flat");
169 return 1;
170 }
171
172 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
173 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
174 return 1;
175 }
176#endif
177
178 return 0;
179}
180
181static void physflat_init_apic_ldr(void)
182{
183 /*
184 * LDR and DFR are not involved in physflat mode, rather:
185 * "In physical destination mode, the destination processor is
186 * specified by its local APIC ID [...]." (Intel SDM, 10.6.2.1)
187 */
188}
189
190static int physflat_probe(void)
191{
192 if (apic == &apic_physflat || num_possible_cpus() > 8 ||
193 jailhouse_paravirt())
194 return 1;
195
196 return 0;
197}
198
199static struct apic apic_physflat __ro_after_init = {
200
201 .name = "physical flat",
202 .probe = physflat_probe,
203 .acpi_madt_oem_check = physflat_acpi_madt_oem_check,
204 .apic_id_valid = default_apic_id_valid,
205 .apic_id_registered = flat_apic_id_registered,
206
207 .delivery_mode = APIC_DELIVERY_MODE_FIXED,
208 .dest_mode_logical = false,
209
210 .disable_esr = 0,
211
212 .check_apicid_used = NULL,
213 .init_apic_ldr = physflat_init_apic_ldr,
214 .ioapic_phys_id_map = NULL,
215 .setup_apic_routing = NULL,
216 .cpu_present_to_apicid = default_cpu_present_to_apicid,
217 .apicid_to_cpu_present = NULL,
218 .check_phys_apicid_present = default_check_phys_apicid_present,
219 .phys_pkg_id = flat_phys_pkg_id,
220
221 .get_apic_id = flat_get_apic_id,
222 .set_apic_id = set_apic_id,
223
224 .calc_dest_apicid = apic_default_calc_apicid,
225
226 .send_IPI = default_send_IPI_single_phys,
227 .send_IPI_mask = default_send_IPI_mask_sequence_phys,
228 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys,
229 .send_IPI_allbutself = default_send_IPI_allbutself,
230 .send_IPI_all = default_send_IPI_all,
231 .send_IPI_self = default_send_IPI_self,
232
233 .inquire_remote_apic = default_inquire_remote_apic,
234
235 .read = native_apic_mem_read,
236 .write = native_apic_mem_write,
237 .eoi_write = native_apic_mem_write,
238 .icr_read = native_apic_icr_read,
239 .icr_write = native_apic_icr_write,
240 .wait_icr_idle = native_apic_wait_icr_idle,
241 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
242};
243
244/*
245 * We need to check for physflat first, so this order is important.
246 */
247apic_drivers(apic_physflat, apic_flat);
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);