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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Common interrupt code for 32 and 64 bit
4 */
5#include <linux/cpu.h>
6#include <linux/interrupt.h>
7#include <linux/kernel_stat.h>
8#include <linux/of.h>
9#include <linux/seq_file.h>
10#include <linux/smp.h>
11#include <linux/ftrace.h>
12#include <linux/delay.h>
13#include <linux/export.h>
14#include <linux/irq.h>
15
16#include <asm/apic.h>
17#include <asm/io_apic.h>
18#include <asm/irq.h>
19#include <asm/mce.h>
20#include <asm/hw_irq.h>
21#include <asm/desc.h>
22
23#define CREATE_TRACE_POINTS
24#include <asm/trace/irq_vectors.h>
25
26DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
27EXPORT_PER_CPU_SYMBOL(irq_stat);
28
29DEFINE_PER_CPU(struct pt_regs *, irq_regs);
30EXPORT_PER_CPU_SYMBOL(irq_regs);
31
32atomic_t irq_err_count;
33
34/*
35 * 'what should we do if we get a hw irq event on an illegal vector'.
36 * each architecture has to answer this themselves.
37 */
38void ack_bad_irq(unsigned int irq)
39{
40 if (printk_ratelimit())
41 pr_err("unexpected IRQ trap at vector %02x\n", irq);
42
43 /*
44 * Currently unexpected vectors happen only on SMP and APIC.
45 * We _must_ ack these because every local APIC has only N
46 * irq slots per priority level, and a 'hanging, unacked' IRQ
47 * holds up an irq slot - in excessive cases (when multiple
48 * unexpected vectors occur) that might lock up the APIC
49 * completely.
50 * But only ack when the APIC is enabled -AK
51 */
52 ack_APIC_irq();
53}
54
55#define irq_stats(x) (&per_cpu(irq_stat, x))
56/*
57 * /proc/interrupts printing for arch specific interrupts
58 */
59int arch_show_interrupts(struct seq_file *p, int prec)
60{
61 int j;
62
63 seq_printf(p, "%*s: ", prec, "NMI");
64 for_each_online_cpu(j)
65 seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
66 seq_puts(p, " Non-maskable interrupts\n");
67#ifdef CONFIG_X86_LOCAL_APIC
68 seq_printf(p, "%*s: ", prec, "LOC");
69 for_each_online_cpu(j)
70 seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
71 seq_puts(p, " Local timer interrupts\n");
72
73 seq_printf(p, "%*s: ", prec, "SPU");
74 for_each_online_cpu(j)
75 seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
76 seq_puts(p, " Spurious interrupts\n");
77 seq_printf(p, "%*s: ", prec, "PMI");
78 for_each_online_cpu(j)
79 seq_printf(p, "%10u ", irq_stats(j)->apic_perf_irqs);
80 seq_puts(p, " Performance monitoring interrupts\n");
81 seq_printf(p, "%*s: ", prec, "IWI");
82 for_each_online_cpu(j)
83 seq_printf(p, "%10u ", irq_stats(j)->apic_irq_work_irqs);
84 seq_puts(p, " IRQ work interrupts\n");
85 seq_printf(p, "%*s: ", prec, "RTR");
86 for_each_online_cpu(j)
87 seq_printf(p, "%10u ", irq_stats(j)->icr_read_retry_count);
88 seq_puts(p, " APIC ICR read retries\n");
89 if (x86_platform_ipi_callback) {
90 seq_printf(p, "%*s: ", prec, "PLT");
91 for_each_online_cpu(j)
92 seq_printf(p, "%10u ", irq_stats(j)->x86_platform_ipis);
93 seq_puts(p, " Platform interrupts\n");
94 }
95#endif
96#ifdef CONFIG_SMP
97 seq_printf(p, "%*s: ", prec, "RES");
98 for_each_online_cpu(j)
99 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
100 seq_puts(p, " Rescheduling interrupts\n");
101 seq_printf(p, "%*s: ", prec, "CAL");
102 for_each_online_cpu(j)
103 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
104 seq_puts(p, " Function call interrupts\n");
105 seq_printf(p, "%*s: ", prec, "TLB");
106 for_each_online_cpu(j)
107 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
108 seq_puts(p, " TLB shootdowns\n");
109#endif
110#ifdef CONFIG_X86_THERMAL_VECTOR
111 seq_printf(p, "%*s: ", prec, "TRM");
112 for_each_online_cpu(j)
113 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
114 seq_puts(p, " Thermal event interrupts\n");
115#endif
116#ifdef CONFIG_X86_MCE_THRESHOLD
117 seq_printf(p, "%*s: ", prec, "THR");
118 for_each_online_cpu(j)
119 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
120 seq_puts(p, " Threshold APIC interrupts\n");
121#endif
122#ifdef CONFIG_X86_MCE_AMD
123 seq_printf(p, "%*s: ", prec, "DFR");
124 for_each_online_cpu(j)
125 seq_printf(p, "%10u ", irq_stats(j)->irq_deferred_error_count);
126 seq_puts(p, " Deferred Error APIC interrupts\n");
127#endif
128#ifdef CONFIG_X86_MCE
129 seq_printf(p, "%*s: ", prec, "MCE");
130 for_each_online_cpu(j)
131 seq_printf(p, "%10u ", per_cpu(mce_exception_count, j));
132 seq_puts(p, " Machine check exceptions\n");
133 seq_printf(p, "%*s: ", prec, "MCP");
134 for_each_online_cpu(j)
135 seq_printf(p, "%10u ", per_cpu(mce_poll_count, j));
136 seq_puts(p, " Machine check polls\n");
137#endif
138#ifdef CONFIG_X86_HV_CALLBACK_VECTOR
139 if (test_bit(HYPERVISOR_CALLBACK_VECTOR, system_vectors)) {
140 seq_printf(p, "%*s: ", prec, "HYP");
141 for_each_online_cpu(j)
142 seq_printf(p, "%10u ",
143 irq_stats(j)->irq_hv_callback_count);
144 seq_puts(p, " Hypervisor callback interrupts\n");
145 }
146#endif
147#if IS_ENABLED(CONFIG_HYPERV)
148 if (test_bit(HYPERV_REENLIGHTENMENT_VECTOR, system_vectors)) {
149 seq_printf(p, "%*s: ", prec, "HRE");
150 for_each_online_cpu(j)
151 seq_printf(p, "%10u ",
152 irq_stats(j)->irq_hv_reenlightenment_count);
153 seq_puts(p, " Hyper-V reenlightenment interrupts\n");
154 }
155 if (test_bit(HYPERV_STIMER0_VECTOR, system_vectors)) {
156 seq_printf(p, "%*s: ", prec, "HVS");
157 for_each_online_cpu(j)
158 seq_printf(p, "%10u ",
159 irq_stats(j)->hyperv_stimer0_count);
160 seq_puts(p, " Hyper-V stimer0 interrupts\n");
161 }
162#endif
163 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
164#if defined(CONFIG_X86_IO_APIC)
165 seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count));
166#endif
167#ifdef CONFIG_HAVE_KVM
168 seq_printf(p, "%*s: ", prec, "PIN");
169 for_each_online_cpu(j)
170 seq_printf(p, "%10u ", irq_stats(j)->kvm_posted_intr_ipis);
171 seq_puts(p, " Posted-interrupt notification event\n");
172
173 seq_printf(p, "%*s: ", prec, "NPI");
174 for_each_online_cpu(j)
175 seq_printf(p, "%10u ",
176 irq_stats(j)->kvm_posted_intr_nested_ipis);
177 seq_puts(p, " Nested posted-interrupt event\n");
178
179 seq_printf(p, "%*s: ", prec, "PIW");
180 for_each_online_cpu(j)
181 seq_printf(p, "%10u ",
182 irq_stats(j)->kvm_posted_intr_wakeup_ipis);
183 seq_puts(p, " Posted-interrupt wakeup event\n");
184#endif
185 return 0;
186}
187
188/*
189 * /proc/stat helpers
190 */
191u64 arch_irq_stat_cpu(unsigned int cpu)
192{
193 u64 sum = irq_stats(cpu)->__nmi_count;
194
195#ifdef CONFIG_X86_LOCAL_APIC
196 sum += irq_stats(cpu)->apic_timer_irqs;
197 sum += irq_stats(cpu)->irq_spurious_count;
198 sum += irq_stats(cpu)->apic_perf_irqs;
199 sum += irq_stats(cpu)->apic_irq_work_irqs;
200 sum += irq_stats(cpu)->icr_read_retry_count;
201 if (x86_platform_ipi_callback)
202 sum += irq_stats(cpu)->x86_platform_ipis;
203#endif
204#ifdef CONFIG_SMP
205 sum += irq_stats(cpu)->irq_resched_count;
206 sum += irq_stats(cpu)->irq_call_count;
207#endif
208#ifdef CONFIG_X86_THERMAL_VECTOR
209 sum += irq_stats(cpu)->irq_thermal_count;
210#endif
211#ifdef CONFIG_X86_MCE_THRESHOLD
212 sum += irq_stats(cpu)->irq_threshold_count;
213#endif
214#ifdef CONFIG_X86_MCE
215 sum += per_cpu(mce_exception_count, cpu);
216 sum += per_cpu(mce_poll_count, cpu);
217#endif
218 return sum;
219}
220
221u64 arch_irq_stat(void)
222{
223 u64 sum = atomic_read(&irq_err_count);
224 return sum;
225}
226
227
228/*
229 * do_IRQ handles all normal device IRQ's (the special
230 * SMP cross-CPU interrupts have their own specific
231 * handlers).
232 */
233__visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
234{
235 struct pt_regs *old_regs = set_irq_regs(regs);
236 struct irq_desc * desc;
237 /* high bit used in ret_from_ code */
238 unsigned vector = ~regs->orig_ax;
239
240 entering_irq();
241
242 /* entering_irq() tells RCU that we're not quiescent. Check it. */
243 RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
244
245 desc = __this_cpu_read(vector_irq[vector]);
246 if (likely(!IS_ERR_OR_NULL(desc))) {
247 if (IS_ENABLED(CONFIG_X86_32))
248 handle_irq(desc, regs);
249 else
250 generic_handle_irq_desc(desc);
251 } else {
252 ack_APIC_irq();
253
254 if (desc == VECTOR_UNUSED) {
255 pr_emerg_ratelimited("%s: %d.%d No irq handler for vector\n",
256 __func__, smp_processor_id(),
257 vector);
258 } else {
259 __this_cpu_write(vector_irq[vector], VECTOR_UNUSED);
260 }
261 }
262
263 exiting_irq();
264
265 set_irq_regs(old_regs);
266 return 1;
267}
268
269#ifdef CONFIG_X86_LOCAL_APIC
270/* Function pointer for generic interrupt vector handling */
271void (*x86_platform_ipi_callback)(void) = NULL;
272/*
273 * Handler for X86_PLATFORM_IPI_VECTOR.
274 */
275__visible void __irq_entry smp_x86_platform_ipi(struct pt_regs *regs)
276{
277 struct pt_regs *old_regs = set_irq_regs(regs);
278
279 entering_ack_irq();
280 trace_x86_platform_ipi_entry(X86_PLATFORM_IPI_VECTOR);
281 inc_irq_stat(x86_platform_ipis);
282 if (x86_platform_ipi_callback)
283 x86_platform_ipi_callback();
284 trace_x86_platform_ipi_exit(X86_PLATFORM_IPI_VECTOR);
285 exiting_irq();
286 set_irq_regs(old_regs);
287}
288#endif
289
290#ifdef CONFIG_HAVE_KVM
291static void dummy_handler(void) {}
292static void (*kvm_posted_intr_wakeup_handler)(void) = dummy_handler;
293
294void kvm_set_posted_intr_wakeup_handler(void (*handler)(void))
295{
296 if (handler)
297 kvm_posted_intr_wakeup_handler = handler;
298 else
299 kvm_posted_intr_wakeup_handler = dummy_handler;
300}
301EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wakeup_handler);
302
303/*
304 * Handler for POSTED_INTERRUPT_VECTOR.
305 */
306__visible void smp_kvm_posted_intr_ipi(struct pt_regs *regs)
307{
308 struct pt_regs *old_regs = set_irq_regs(regs);
309
310 entering_ack_irq();
311 inc_irq_stat(kvm_posted_intr_ipis);
312 exiting_irq();
313 set_irq_regs(old_regs);
314}
315
316/*
317 * Handler for POSTED_INTERRUPT_WAKEUP_VECTOR.
318 */
319__visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs)
320{
321 struct pt_regs *old_regs = set_irq_regs(regs);
322
323 entering_ack_irq();
324 inc_irq_stat(kvm_posted_intr_wakeup_ipis);
325 kvm_posted_intr_wakeup_handler();
326 exiting_irq();
327 set_irq_regs(old_regs);
328}
329
330/*
331 * Handler for POSTED_INTERRUPT_NESTED_VECTOR.
332 */
333__visible void smp_kvm_posted_intr_nested_ipi(struct pt_regs *regs)
334{
335 struct pt_regs *old_regs = set_irq_regs(regs);
336
337 entering_ack_irq();
338 inc_irq_stat(kvm_posted_intr_nested_ipis);
339 exiting_irq();
340 set_irq_regs(old_regs);
341}
342#endif
343
344
345#ifdef CONFIG_HOTPLUG_CPU
346/* A cpu has been removed from cpu_online_mask. Reset irq affinities. */
347void fixup_irqs(void)
348{
349 unsigned int irr, vector;
350 struct irq_desc *desc;
351 struct irq_data *data;
352 struct irq_chip *chip;
353
354 irq_migrate_all_off_this_cpu();
355
356 /*
357 * We can remove mdelay() and then send spuriuous interrupts to
358 * new cpu targets for all the irqs that were handled previously by
359 * this cpu. While it works, I have seen spurious interrupt messages
360 * (nothing wrong but still...).
361 *
362 * So for now, retain mdelay(1) and check the IRR and then send those
363 * interrupts to new targets as this cpu is already offlined...
364 */
365 mdelay(1);
366
367 /*
368 * We can walk the vector array of this cpu without holding
369 * vector_lock because the cpu is already marked !online, so
370 * nothing else will touch it.
371 */
372 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
373 if (IS_ERR_OR_NULL(__this_cpu_read(vector_irq[vector])))
374 continue;
375
376 irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
377 if (irr & (1 << (vector % 32))) {
378 desc = __this_cpu_read(vector_irq[vector]);
379
380 raw_spin_lock(&desc->lock);
381 data = irq_desc_get_irq_data(desc);
382 chip = irq_data_get_irq_chip(data);
383 if (chip->irq_retrigger) {
384 chip->irq_retrigger(data);
385 __this_cpu_write(vector_irq[vector], VECTOR_RETRIGGERED);
386 }
387 raw_spin_unlock(&desc->lock);
388 }
389 if (__this_cpu_read(vector_irq[vector]) != VECTOR_RETRIGGERED)
390 __this_cpu_write(vector_irq[vector], VECTOR_UNUSED);
391 }
392}
393#endif
1/*
2 * Common interrupt code for 32 and 64 bit
3 */
4#include <linux/cpu.h>
5#include <linux/interrupt.h>
6#include <linux/kernel_stat.h>
7#include <linux/of.h>
8#include <linux/seq_file.h>
9#include <linux/smp.h>
10#include <linux/ftrace.h>
11#include <linux/delay.h>
12
13#include <asm/apic.h>
14#include <asm/io_apic.h>
15#include <asm/irq.h>
16#include <asm/idle.h>
17#include <asm/mce.h>
18#include <asm/hw_irq.h>
19
20atomic_t irq_err_count;
21
22/* Function pointer for generic interrupt vector handling */
23void (*x86_platform_ipi_callback)(void) = NULL;
24
25/*
26 * 'what should we do if we get a hw irq event on an illegal vector'.
27 * each architecture has to answer this themselves.
28 */
29void ack_bad_irq(unsigned int irq)
30{
31 if (printk_ratelimit())
32 pr_err("unexpected IRQ trap at vector %02x\n", irq);
33
34 /*
35 * Currently unexpected vectors happen only on SMP and APIC.
36 * We _must_ ack these because every local APIC has only N
37 * irq slots per priority level, and a 'hanging, unacked' IRQ
38 * holds up an irq slot - in excessive cases (when multiple
39 * unexpected vectors occur) that might lock up the APIC
40 * completely.
41 * But only ack when the APIC is enabled -AK
42 */
43 ack_APIC_irq();
44}
45
46#define irq_stats(x) (&per_cpu(irq_stat, x))
47/*
48 * /proc/interrupts printing for arch specific interrupts
49 */
50int arch_show_interrupts(struct seq_file *p, int prec)
51{
52 int j;
53
54 seq_printf(p, "%*s: ", prec, "NMI");
55 for_each_online_cpu(j)
56 seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
57 seq_printf(p, " Non-maskable interrupts\n");
58#ifdef CONFIG_X86_LOCAL_APIC
59 seq_printf(p, "%*s: ", prec, "LOC");
60 for_each_online_cpu(j)
61 seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
62 seq_printf(p, " Local timer interrupts\n");
63
64 seq_printf(p, "%*s: ", prec, "SPU");
65 for_each_online_cpu(j)
66 seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
67 seq_printf(p, " Spurious interrupts\n");
68 seq_printf(p, "%*s: ", prec, "PMI");
69 for_each_online_cpu(j)
70 seq_printf(p, "%10u ", irq_stats(j)->apic_perf_irqs);
71 seq_printf(p, " Performance monitoring interrupts\n");
72 seq_printf(p, "%*s: ", prec, "IWI");
73 for_each_online_cpu(j)
74 seq_printf(p, "%10u ", irq_stats(j)->apic_irq_work_irqs);
75 seq_printf(p, " IRQ work interrupts\n");
76#endif
77 if (x86_platform_ipi_callback) {
78 seq_printf(p, "%*s: ", prec, "PLT");
79 for_each_online_cpu(j)
80 seq_printf(p, "%10u ", irq_stats(j)->x86_platform_ipis);
81 seq_printf(p, " Platform interrupts\n");
82 }
83#ifdef CONFIG_SMP
84 seq_printf(p, "%*s: ", prec, "RES");
85 for_each_online_cpu(j)
86 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
87 seq_printf(p, " Rescheduling interrupts\n");
88 seq_printf(p, "%*s: ", prec, "CAL");
89 for_each_online_cpu(j)
90 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
91 seq_printf(p, " Function call interrupts\n");
92 seq_printf(p, "%*s: ", prec, "TLB");
93 for_each_online_cpu(j)
94 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
95 seq_printf(p, " TLB shootdowns\n");
96#endif
97#ifdef CONFIG_X86_THERMAL_VECTOR
98 seq_printf(p, "%*s: ", prec, "TRM");
99 for_each_online_cpu(j)
100 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
101 seq_printf(p, " Thermal event interrupts\n");
102#endif
103#ifdef CONFIG_X86_MCE_THRESHOLD
104 seq_printf(p, "%*s: ", prec, "THR");
105 for_each_online_cpu(j)
106 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
107 seq_printf(p, " Threshold APIC interrupts\n");
108#endif
109#ifdef CONFIG_X86_MCE
110 seq_printf(p, "%*s: ", prec, "MCE");
111 for_each_online_cpu(j)
112 seq_printf(p, "%10u ", per_cpu(mce_exception_count, j));
113 seq_printf(p, " Machine check exceptions\n");
114 seq_printf(p, "%*s: ", prec, "MCP");
115 for_each_online_cpu(j)
116 seq_printf(p, "%10u ", per_cpu(mce_poll_count, j));
117 seq_printf(p, " Machine check polls\n");
118#endif
119 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
120#if defined(CONFIG_X86_IO_APIC)
121 seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count));
122#endif
123 return 0;
124}
125
126/*
127 * /proc/stat helpers
128 */
129u64 arch_irq_stat_cpu(unsigned int cpu)
130{
131 u64 sum = irq_stats(cpu)->__nmi_count;
132
133#ifdef CONFIG_X86_LOCAL_APIC
134 sum += irq_stats(cpu)->apic_timer_irqs;
135 sum += irq_stats(cpu)->irq_spurious_count;
136 sum += irq_stats(cpu)->apic_perf_irqs;
137 sum += irq_stats(cpu)->apic_irq_work_irqs;
138#endif
139 if (x86_platform_ipi_callback)
140 sum += irq_stats(cpu)->x86_platform_ipis;
141#ifdef CONFIG_SMP
142 sum += irq_stats(cpu)->irq_resched_count;
143 sum += irq_stats(cpu)->irq_call_count;
144 sum += irq_stats(cpu)->irq_tlb_count;
145#endif
146#ifdef CONFIG_X86_THERMAL_VECTOR
147 sum += irq_stats(cpu)->irq_thermal_count;
148#endif
149#ifdef CONFIG_X86_MCE_THRESHOLD
150 sum += irq_stats(cpu)->irq_threshold_count;
151#endif
152#ifdef CONFIG_X86_MCE
153 sum += per_cpu(mce_exception_count, cpu);
154 sum += per_cpu(mce_poll_count, cpu);
155#endif
156 return sum;
157}
158
159u64 arch_irq_stat(void)
160{
161 u64 sum = atomic_read(&irq_err_count);
162
163#ifdef CONFIG_X86_IO_APIC
164 sum += atomic_read(&irq_mis_count);
165#endif
166 return sum;
167}
168
169
170/*
171 * do_IRQ handles all normal device IRQ's (the special
172 * SMP cross-CPU interrupts have their own specific
173 * handlers).
174 */
175unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
176{
177 struct pt_regs *old_regs = set_irq_regs(regs);
178
179 /* high bit used in ret_from_ code */
180 unsigned vector = ~regs->orig_ax;
181 unsigned irq;
182
183 exit_idle();
184 irq_enter();
185
186 irq = __this_cpu_read(vector_irq[vector]);
187
188 if (!handle_irq(irq, regs)) {
189 ack_APIC_irq();
190
191 if (printk_ratelimit())
192 pr_emerg("%s: %d.%d No irq handler for vector (irq %d)\n",
193 __func__, smp_processor_id(), vector, irq);
194 }
195
196 irq_exit();
197
198 set_irq_regs(old_regs);
199 return 1;
200}
201
202/*
203 * Handler for X86_PLATFORM_IPI_VECTOR.
204 */
205void smp_x86_platform_ipi(struct pt_regs *regs)
206{
207 struct pt_regs *old_regs = set_irq_regs(regs);
208
209 ack_APIC_irq();
210
211 exit_idle();
212
213 irq_enter();
214
215 inc_irq_stat(x86_platform_ipis);
216
217 if (x86_platform_ipi_callback)
218 x86_platform_ipi_callback();
219
220 irq_exit();
221
222 set_irq_regs(old_regs);
223}
224
225EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);
226
227#ifdef CONFIG_HOTPLUG_CPU
228/* A cpu has been removed from cpu_online_mask. Reset irq affinities. */
229void fixup_irqs(void)
230{
231 unsigned int irq, vector;
232 static int warned;
233 struct irq_desc *desc;
234 struct irq_data *data;
235 struct irq_chip *chip;
236
237 for_each_irq_desc(irq, desc) {
238 int break_affinity = 0;
239 int set_affinity = 1;
240 const struct cpumask *affinity;
241
242 if (!desc)
243 continue;
244 if (irq == 2)
245 continue;
246
247 /* interrupt's are disabled at this point */
248 raw_spin_lock(&desc->lock);
249
250 data = irq_desc_get_irq_data(desc);
251 affinity = data->affinity;
252 if (!irq_has_action(irq) || irqd_is_per_cpu(data) ||
253 cpumask_subset(affinity, cpu_online_mask)) {
254 raw_spin_unlock(&desc->lock);
255 continue;
256 }
257
258 /*
259 * Complete the irq move. This cpu is going down and for
260 * non intr-remapping case, we can't wait till this interrupt
261 * arrives at this cpu before completing the irq move.
262 */
263 irq_force_complete_move(irq);
264
265 if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
266 break_affinity = 1;
267 affinity = cpu_all_mask;
268 }
269
270 chip = irq_data_get_irq_chip(data);
271 if (!irqd_can_move_in_process_context(data) && chip->irq_mask)
272 chip->irq_mask(data);
273
274 if (chip->irq_set_affinity)
275 chip->irq_set_affinity(data, affinity, true);
276 else if (!(warned++))
277 set_affinity = 0;
278
279 if (!irqd_can_move_in_process_context(data) &&
280 !irqd_irq_disabled(data) && chip->irq_unmask)
281 chip->irq_unmask(data);
282
283 raw_spin_unlock(&desc->lock);
284
285 if (break_affinity && set_affinity)
286 printk("Broke affinity for irq %i\n", irq);
287 else if (!set_affinity)
288 printk("Cannot set affinity for irq %i\n", irq);
289 }
290
291 /*
292 * We can remove mdelay() and then send spuriuous interrupts to
293 * new cpu targets for all the irqs that were handled previously by
294 * this cpu. While it works, I have seen spurious interrupt messages
295 * (nothing wrong but still...).
296 *
297 * So for now, retain mdelay(1) and check the IRR and then send those
298 * interrupts to new targets as this cpu is already offlined...
299 */
300 mdelay(1);
301
302 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
303 unsigned int irr;
304
305 if (__this_cpu_read(vector_irq[vector]) < 0)
306 continue;
307
308 irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
309 if (irr & (1 << (vector % 32))) {
310 irq = __this_cpu_read(vector_irq[vector]);
311
312 desc = irq_to_desc(irq);
313 data = irq_desc_get_irq_data(desc);
314 chip = irq_data_get_irq_chip(data);
315 raw_spin_lock(&desc->lock);
316 if (chip->irq_retrigger)
317 chip->irq_retrigger(data);
318 raw_spin_unlock(&desc->lock);
319 }
320 }
321}
322#endif