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1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/cpumask.h>
4#include <linux/smp.h>
5
6#include "local.h"
7
8DEFINE_STATIC_KEY_FALSE(apic_use_ipi_shorthand);
9
10#ifdef CONFIG_SMP
11static int apic_ipi_shorthand_off __ro_after_init;
12
13static __init int apic_ipi_shorthand(char *str)
14{
15 get_option(&str, &apic_ipi_shorthand_off);
16 return 1;
17}
18__setup("no_ipi_broadcast=", apic_ipi_shorthand);
19
20static int __init print_ipi_mode(void)
21{
22 pr_info("IPI shorthand broadcast: %s\n",
23 apic_ipi_shorthand_off ? "disabled" : "enabled");
24 return 0;
25}
26late_initcall(print_ipi_mode);
27
28void apic_smt_update(void)
29{
30 /*
31 * Do not switch to broadcast mode if:
32 * - Disabled on the command line
33 * - Only a single CPU is online
34 * - Not all present CPUs have been at least booted once
35 *
36 * The latter is important as the local APIC might be in some
37 * random state and a broadcast might cause havoc. That's
38 * especially true for NMI broadcasting.
39 */
40 if (apic_ipi_shorthand_off || num_online_cpus() == 1 ||
41 !cpumask_equal(cpu_present_mask, &cpus_booted_once_mask)) {
42 static_branch_disable(&apic_use_ipi_shorthand);
43 } else {
44 static_branch_enable(&apic_use_ipi_shorthand);
45 }
46}
47
48void apic_send_IPI_allbutself(unsigned int vector)
49{
50 if (num_online_cpus() < 2)
51 return;
52
53 if (static_branch_likely(&apic_use_ipi_shorthand))
54 apic->send_IPI_allbutself(vector);
55 else
56 apic->send_IPI_mask_allbutself(cpu_online_mask, vector);
57}
58
59/*
60 * Send a 'reschedule' IPI to another CPU. It goes straight through and
61 * wastes no time serializing anything. Worst case is that we lose a
62 * reschedule ...
63 */
64void native_smp_send_reschedule(int cpu)
65{
66 if (unlikely(cpu_is_offline(cpu))) {
67 WARN(1, "sched: Unexpected reschedule of offline CPU#%d!\n", cpu);
68 return;
69 }
70 apic->send_IPI(cpu, RESCHEDULE_VECTOR);
71}
72
73void native_send_call_func_single_ipi(int cpu)
74{
75 apic->send_IPI(cpu, CALL_FUNCTION_SINGLE_VECTOR);
76}
77
78void native_send_call_func_ipi(const struct cpumask *mask)
79{
80 if (static_branch_likely(&apic_use_ipi_shorthand)) {
81 unsigned int cpu = smp_processor_id();
82
83 if (!cpumask_or_equal(mask, cpumask_of(cpu), cpu_online_mask))
84 goto sendmask;
85
86 if (cpumask_test_cpu(cpu, mask))
87 apic->send_IPI_all(CALL_FUNCTION_VECTOR);
88 else if (num_online_cpus() > 1)
89 apic->send_IPI_allbutself(CALL_FUNCTION_VECTOR);
90 return;
91 }
92
93sendmask:
94 apic->send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
95}
96
97#endif /* CONFIG_SMP */
98
99static inline int __prepare_ICR2(unsigned int mask)
100{
101 return SET_APIC_DEST_FIELD(mask);
102}
103
104static inline void __xapic_wait_icr_idle(void)
105{
106 while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)
107 cpu_relax();
108}
109
110void __default_send_IPI_shortcut(unsigned int shortcut, int vector)
111{
112 /*
113 * Subtle. In the case of the 'never do double writes' workaround
114 * we have to lock out interrupts to be safe. As we don't care
115 * of the value read we use an atomic rmw access to avoid costly
116 * cli/sti. Otherwise we use an even cheaper single atomic write
117 * to the APIC.
118 */
119 unsigned int cfg;
120
121 /*
122 * Wait for idle.
123 */
124 if (unlikely(vector == NMI_VECTOR))
125 safe_apic_wait_icr_idle();
126 else
127 __xapic_wait_icr_idle();
128
129 /*
130 * No need to touch the target chip field. Also the destination
131 * mode is ignored when a shorthand is used.
132 */
133 cfg = __prepare_ICR(shortcut, vector, 0);
134
135 /*
136 * Send the IPI. The write to APIC_ICR fires this off.
137 */
138 native_apic_mem_write(APIC_ICR, cfg);
139}
140
141/*
142 * This is used to send an IPI with no shorthand notation (the destination is
143 * specified in bits 56 to 63 of the ICR).
144 */
145void __default_send_IPI_dest_field(unsigned int mask, int vector, unsigned int dest)
146{
147 unsigned long cfg;
148
149 /*
150 * Wait for idle.
151 */
152 if (unlikely(vector == NMI_VECTOR))
153 safe_apic_wait_icr_idle();
154 else
155 __xapic_wait_icr_idle();
156
157 /*
158 * prepare target chip field
159 */
160 cfg = __prepare_ICR2(mask);
161 native_apic_mem_write(APIC_ICR2, cfg);
162
163 /*
164 * program the ICR
165 */
166 cfg = __prepare_ICR(0, vector, dest);
167
168 /*
169 * Send the IPI. The write to APIC_ICR fires this off.
170 */
171 native_apic_mem_write(APIC_ICR, cfg);
172}
173
174void default_send_IPI_single_phys(int cpu, int vector)
175{
176 unsigned long flags;
177
178 local_irq_save(flags);
179 __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid, cpu),
180 vector, APIC_DEST_PHYSICAL);
181 local_irq_restore(flags);
182}
183
184void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
185{
186 unsigned long query_cpu;
187 unsigned long flags;
188
189 /*
190 * Hack. The clustered APIC addressing mode doesn't allow us to send
191 * to an arbitrary mask, so I do a unicast to each CPU instead.
192 * - mbligh
193 */
194 local_irq_save(flags);
195 for_each_cpu(query_cpu, mask) {
196 __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
197 query_cpu), vector, APIC_DEST_PHYSICAL);
198 }
199 local_irq_restore(flags);
200}
201
202void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
203 int vector)
204{
205 unsigned int this_cpu = smp_processor_id();
206 unsigned int query_cpu;
207 unsigned long flags;
208
209 /* See Hack comment above */
210
211 local_irq_save(flags);
212 for_each_cpu(query_cpu, mask) {
213 if (query_cpu == this_cpu)
214 continue;
215 __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
216 query_cpu), vector, APIC_DEST_PHYSICAL);
217 }
218 local_irq_restore(flags);
219}
220
221/*
222 * Helper function for APICs which insist on cpumasks
223 */
224void default_send_IPI_single(int cpu, int vector)
225{
226 apic->send_IPI_mask(cpumask_of(cpu), vector);
227}
228
229void default_send_IPI_allbutself(int vector)
230{
231 __default_send_IPI_shortcut(APIC_DEST_ALLBUT, vector);
232}
233
234void default_send_IPI_all(int vector)
235{
236 __default_send_IPI_shortcut(APIC_DEST_ALLINC, vector);
237}
238
239void default_send_IPI_self(int vector)
240{
241 __default_send_IPI_shortcut(APIC_DEST_SELF, vector);
242}
243
244#ifdef CONFIG_X86_32
245
246void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
247 int vector)
248{
249 unsigned long flags;
250 unsigned int query_cpu;
251
252 /*
253 * Hack. The clustered APIC addressing mode doesn't allow us to send
254 * to an arbitrary mask, so I do a unicasts to each CPU instead. This
255 * should be modified to do 1 message per cluster ID - mbligh
256 */
257
258 local_irq_save(flags);
259 for_each_cpu(query_cpu, mask)
260 __default_send_IPI_dest_field(
261 early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
262 vector, apic->dest_logical);
263 local_irq_restore(flags);
264}
265
266void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
267 int vector)
268{
269 unsigned long flags;
270 unsigned int query_cpu;
271 unsigned int this_cpu = smp_processor_id();
272
273 /* See Hack comment above */
274
275 local_irq_save(flags);
276 for_each_cpu(query_cpu, mask) {
277 if (query_cpu == this_cpu)
278 continue;
279 __default_send_IPI_dest_field(
280 early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
281 vector, apic->dest_logical);
282 }
283 local_irq_restore(flags);
284}
285
286/*
287 * This is only used on smaller machines.
288 */
289void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
290{
291 unsigned long mask = cpumask_bits(cpumask)[0];
292 unsigned long flags;
293
294 if (!mask)
295 return;
296
297 local_irq_save(flags);
298 WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
299 __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
300 local_irq_restore(flags);
301}
302
303/* must come after the send_IPI functions above for inlining */
304static int convert_apicid_to_cpu(int apic_id)
305{
306 int i;
307
308 for_each_possible_cpu(i) {
309 if (per_cpu(x86_cpu_to_apicid, i) == apic_id)
310 return i;
311 }
312 return -1;
313}
314
315int safe_smp_processor_id(void)
316{
317 int apicid, cpuid;
318
319 if (!boot_cpu_has(X86_FEATURE_APIC))
320 return 0;
321
322 apicid = hard_smp_processor_id();
323 if (apicid == BAD_APICID)
324 return 0;
325
326 cpuid = convert_apicid_to_cpu(apicid);
327
328 return cpuid >= 0 ? cpuid : 0;
329}
330#endif
1#include <linux/cpumask.h>
2#include <linux/interrupt.h>
3
4#include <linux/mm.h>
5#include <linux/delay.h>
6#include <linux/spinlock.h>
7#include <linux/kernel_stat.h>
8#include <linux/mc146818rtc.h>
9#include <linux/cache.h>
10#include <linux/cpu.h>
11
12#include <asm/smp.h>
13#include <asm/mtrr.h>
14#include <asm/tlbflush.h>
15#include <asm/mmu_context.h>
16#include <asm/apic.h>
17#include <asm/proto.h>
18#include <asm/ipi.h>
19
20void __default_send_IPI_shortcut(unsigned int shortcut, int vector, unsigned int dest)
21{
22 /*
23 * Subtle. In the case of the 'never do double writes' workaround
24 * we have to lock out interrupts to be safe. As we don't care
25 * of the value read we use an atomic rmw access to avoid costly
26 * cli/sti. Otherwise we use an even cheaper single atomic write
27 * to the APIC.
28 */
29 unsigned int cfg;
30
31 /*
32 * Wait for idle.
33 */
34 __xapic_wait_icr_idle();
35
36 /*
37 * No need to touch the target chip field
38 */
39 cfg = __prepare_ICR(shortcut, vector, dest);
40
41 /*
42 * Send the IPI. The write to APIC_ICR fires this off.
43 */
44 native_apic_mem_write(APIC_ICR, cfg);
45}
46
47/*
48 * This is used to send an IPI with no shorthand notation (the destination is
49 * specified in bits 56 to 63 of the ICR).
50 */
51void __default_send_IPI_dest_field(unsigned int mask, int vector, unsigned int dest)
52{
53 unsigned long cfg;
54
55 /*
56 * Wait for idle.
57 */
58 if (unlikely(vector == NMI_VECTOR))
59 safe_apic_wait_icr_idle();
60 else
61 __xapic_wait_icr_idle();
62
63 /*
64 * prepare target chip field
65 */
66 cfg = __prepare_ICR2(mask);
67 native_apic_mem_write(APIC_ICR2, cfg);
68
69 /*
70 * program the ICR
71 */
72 cfg = __prepare_ICR(0, vector, dest);
73
74 /*
75 * Send the IPI. The write to APIC_ICR fires this off.
76 */
77 native_apic_mem_write(APIC_ICR, cfg);
78}
79
80void default_send_IPI_single_phys(int cpu, int vector)
81{
82 unsigned long flags;
83
84 local_irq_save(flags);
85 __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid, cpu),
86 vector, APIC_DEST_PHYSICAL);
87 local_irq_restore(flags);
88}
89
90void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
91{
92 unsigned long query_cpu;
93 unsigned long flags;
94
95 /*
96 * Hack. The clustered APIC addressing mode doesn't allow us to send
97 * to an arbitrary mask, so I do a unicast to each CPU instead.
98 * - mbligh
99 */
100 local_irq_save(flags);
101 for_each_cpu(query_cpu, mask) {
102 __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
103 query_cpu), vector, APIC_DEST_PHYSICAL);
104 }
105 local_irq_restore(flags);
106}
107
108void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
109 int vector)
110{
111 unsigned int this_cpu = smp_processor_id();
112 unsigned int query_cpu;
113 unsigned long flags;
114
115 /* See Hack comment above */
116
117 local_irq_save(flags);
118 for_each_cpu(query_cpu, mask) {
119 if (query_cpu == this_cpu)
120 continue;
121 __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
122 query_cpu), vector, APIC_DEST_PHYSICAL);
123 }
124 local_irq_restore(flags);
125}
126
127/*
128 * Helper function for APICs which insist on cpumasks
129 */
130void default_send_IPI_single(int cpu, int vector)
131{
132 apic->send_IPI_mask(cpumask_of(cpu), vector);
133}
134
135#ifdef CONFIG_X86_32
136
137void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
138 int vector)
139{
140 unsigned long flags;
141 unsigned int query_cpu;
142
143 /*
144 * Hack. The clustered APIC addressing mode doesn't allow us to send
145 * to an arbitrary mask, so I do a unicasts to each CPU instead. This
146 * should be modified to do 1 message per cluster ID - mbligh
147 */
148
149 local_irq_save(flags);
150 for_each_cpu(query_cpu, mask)
151 __default_send_IPI_dest_field(
152 early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
153 vector, apic->dest_logical);
154 local_irq_restore(flags);
155}
156
157void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
158 int vector)
159{
160 unsigned long flags;
161 unsigned int query_cpu;
162 unsigned int this_cpu = smp_processor_id();
163
164 /* See Hack comment above */
165
166 local_irq_save(flags);
167 for_each_cpu(query_cpu, mask) {
168 if (query_cpu == this_cpu)
169 continue;
170 __default_send_IPI_dest_field(
171 early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
172 vector, apic->dest_logical);
173 }
174 local_irq_restore(flags);
175}
176
177/*
178 * This is only used on smaller machines.
179 */
180void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
181{
182 unsigned long mask = cpumask_bits(cpumask)[0];
183 unsigned long flags;
184
185 if (!mask)
186 return;
187
188 local_irq_save(flags);
189 WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
190 __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
191 local_irq_restore(flags);
192}
193
194void default_send_IPI_allbutself(int vector)
195{
196 /*
197 * if there are no other CPUs in the system then we get an APIC send
198 * error if we try to broadcast, thus avoid sending IPIs in this case.
199 */
200 if (!(num_online_cpus() > 1))
201 return;
202
203 __default_local_send_IPI_allbutself(vector);
204}
205
206void default_send_IPI_all(int vector)
207{
208 __default_local_send_IPI_all(vector);
209}
210
211void default_send_IPI_self(int vector)
212{
213 __default_send_IPI_shortcut(APIC_DEST_SELF, vector, apic->dest_logical);
214}
215
216/* must come after the send_IPI functions above for inlining */
217static int convert_apicid_to_cpu(int apic_id)
218{
219 int i;
220
221 for_each_possible_cpu(i) {
222 if (per_cpu(x86_cpu_to_apicid, i) == apic_id)
223 return i;
224 }
225 return -1;
226}
227
228int safe_smp_processor_id(void)
229{
230 int apicid, cpuid;
231
232 if (!boot_cpu_has(X86_FEATURE_APIC))
233 return 0;
234
235 apicid = hard_smp_processor_id();
236 if (apicid == BAD_APICID)
237 return 0;
238
239 cpuid = convert_apicid_to_cpu(apicid);
240
241 return cpuid >= 0 ? cpuid : 0;
242}
243#endif