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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/*
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 inline 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 .check_apicid_present = NULL,
172
173 .vector_allocation_domain = flat_vector_allocation_domain,
174 .init_apic_ldr = flat_init_apic_ldr,
175
176 .ioapic_phys_id_map = NULL,
177 .setup_apic_routing = NULL,
178 .multi_timer_check = NULL,
179 .cpu_present_to_apicid = default_cpu_present_to_apicid,
180 .apicid_to_cpu_present = NULL,
181 .setup_portio_remap = NULL,
182 .check_phys_apicid_present = default_check_phys_apicid_present,
183 .enable_apic_mode = NULL,
184 .phys_pkg_id = flat_phys_pkg_id,
185 .mps_oem_check = NULL,
186
187 .get_apic_id = flat_get_apic_id,
188 .set_apic_id = set_apic_id,
189 .apic_id_mask = 0xFFu << 24,
190
191 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
192
193 .send_IPI_mask = flat_send_IPI_mask,
194 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
195 .send_IPI_allbutself = flat_send_IPI_allbutself,
196 .send_IPI_all = flat_send_IPI_all,
197 .send_IPI_self = apic_send_IPI_self,
198
199 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
200 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
201 .wait_for_init_deassert = false,
202 .smp_callin_clear_local_apic = NULL,
203 .inquire_remote_apic = default_inquire_remote_apic,
204
205 .read = native_apic_mem_read,
206 .write = native_apic_mem_write,
207 .eoi_write = native_apic_mem_write,
208 .icr_read = native_apic_icr_read,
209 .icr_write = native_apic_icr_write,
210 .wait_icr_idle = native_apic_wait_icr_idle,
211 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
212};
213
214/*
215 * Physflat mode is used when there are more than 8 CPUs on a system.
216 * We cannot use logical delivery in this case because the mask
217 * overflows, so use physical mode.
218 */
219static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
220{
221#ifdef CONFIG_ACPI
222 /*
223 * Quirk: some x86_64 machines can only use physical APIC mode
224 * regardless of how many processors are present (x86_64 ES7000
225 * is an example).
226 */
227 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
228 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
229 printk(KERN_DEBUG "system APIC only can use physical flat");
230 return 1;
231 }
232
233 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
234 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
235 return 1;
236 }
237#endif
238
239 return 0;
240}
241
242static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
243{
244 default_send_IPI_mask_sequence_phys(cpumask, vector);
245}
246
247static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
248 int vector)
249{
250 default_send_IPI_mask_allbutself_phys(cpumask, vector);
251}
252
253static void physflat_send_IPI_allbutself(int vector)
254{
255 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
256}
257
258static void physflat_send_IPI_all(int vector)
259{
260 physflat_send_IPI_mask(cpu_online_mask, vector);
261}
262
263static int physflat_probe(void)
264{
265 if (apic == &apic_physflat || num_possible_cpus() > 8)
266 return 1;
267
268 return 0;
269}
270
271static struct apic apic_physflat = {
272
273 .name = "physical flat",
274 .probe = physflat_probe,
275 .acpi_madt_oem_check = physflat_acpi_madt_oem_check,
276 .apic_id_valid = default_apic_id_valid,
277 .apic_id_registered = flat_apic_id_registered,
278
279 .irq_delivery_mode = dest_Fixed,
280 .irq_dest_mode = 0, /* physical */
281
282 .target_cpus = online_target_cpus,
283 .disable_esr = 0,
284 .dest_logical = 0,
285 .check_apicid_used = NULL,
286 .check_apicid_present = NULL,
287
288 .vector_allocation_domain = default_vector_allocation_domain,
289 /* not needed, but shouldn't hurt: */
290 .init_apic_ldr = flat_init_apic_ldr,
291
292 .ioapic_phys_id_map = NULL,
293 .setup_apic_routing = NULL,
294 .multi_timer_check = NULL,
295 .cpu_present_to_apicid = default_cpu_present_to_apicid,
296 .apicid_to_cpu_present = NULL,
297 .setup_portio_remap = NULL,
298 .check_phys_apicid_present = default_check_phys_apicid_present,
299 .enable_apic_mode = NULL,
300 .phys_pkg_id = flat_phys_pkg_id,
301 .mps_oem_check = NULL,
302
303 .get_apic_id = flat_get_apic_id,
304 .set_apic_id = set_apic_id,
305 .apic_id_mask = 0xFFu << 24,
306
307 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,
308
309 .send_IPI_mask = physflat_send_IPI_mask,
310 .send_IPI_mask_allbutself = physflat_send_IPI_mask_allbutself,
311 .send_IPI_allbutself = physflat_send_IPI_allbutself,
312 .send_IPI_all = physflat_send_IPI_all,
313 .send_IPI_self = apic_send_IPI_self,
314
315 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
316 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
317 .wait_for_init_deassert = false,
318 .smp_callin_clear_local_apic = NULL,
319 .inquire_remote_apic = default_inquire_remote_apic,
320
321 .read = native_apic_mem_read,
322 .write = native_apic_mem_write,
323 .eoi_write = native_apic_mem_write,
324 .icr_read = native_apic_icr_read,
325 .icr_write = native_apic_icr_write,
326 .wait_icr_idle = native_apic_wait_icr_idle,
327 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
328};
329
330/*
331 * We need to check for physflat first, so this order is important.
332 */
333apic_drivers(apic_physflat, apic_flat);