Commit | Line | Data |
---|---|---|
6b39ba77 TG |
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> | |
4722d194 | 7 | #include <linux/of.h> |
6b39ba77 | 8 | #include <linux/seq_file.h> |
6a02e710 | 9 | #include <linux/smp.h> |
7c1d7cdc | 10 | #include <linux/ftrace.h> |
ca444564 | 11 | #include <linux/delay.h> |
69c60c88 | 12 | #include <linux/export.h> |
6b39ba77 | 13 | |
7b6aa335 | 14 | #include <asm/apic.h> |
6b39ba77 | 15 | #include <asm/io_apic.h> |
c3d80000 | 16 | #include <asm/irq.h> |
7c1d7cdc | 17 | #include <asm/idle.h> |
01ca79f1 | 18 | #include <asm/mce.h> |
2c1b284e | 19 | #include <asm/hw_irq.h> |
ac2a5539 | 20 | #include <asm/desc.h> |
83ab8514 SRRH |
21 | |
22 | #define CREATE_TRACE_POINTS | |
cf910e83 | 23 | #include <asm/trace/irq_vectors.h> |
6b39ba77 | 24 | |
c5bde906 BG |
25 | DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); |
26 | EXPORT_PER_CPU_SYMBOL(irq_stat); | |
27 | ||
28 | DEFINE_PER_CPU(struct pt_regs *, irq_regs); | |
29 | EXPORT_PER_CPU_SYMBOL(irq_regs); | |
30 | ||
6b39ba77 TG |
31 | atomic_t irq_err_count; |
32 | ||
acaabe79 | 33 | /* Function pointer for generic interrupt vector handling */ |
4a4de9c7 | 34 | void (*x86_platform_ipi_callback)(void) = NULL; |
acaabe79 | 35 | |
249f6d9e TG |
36 | /* |
37 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
38 | * each architecture has to answer this themselves. | |
39 | */ | |
40 | void ack_bad_irq(unsigned int irq) | |
41 | { | |
edea7148 CG |
42 | if (printk_ratelimit()) |
43 | pr_err("unexpected IRQ trap at vector %02x\n", irq); | |
249f6d9e | 44 | |
249f6d9e TG |
45 | /* |
46 | * Currently unexpected vectors happen only on SMP and APIC. | |
47 | * We _must_ ack these because every local APIC has only N | |
48 | * irq slots per priority level, and a 'hanging, unacked' IRQ | |
49 | * holds up an irq slot - in excessive cases (when multiple | |
50 | * unexpected vectors occur) that might lock up the APIC | |
51 | * completely. | |
52 | * But only ack when the APIC is enabled -AK | |
53 | */ | |
08306ce6 | 54 | ack_APIC_irq(); |
249f6d9e TG |
55 | } |
56 | ||
1b437c8c | 57 | #define irq_stats(x) (&per_cpu(irq_stat, x)) |
6b39ba77 | 58 | /* |
517e4981 | 59 | * /proc/interrupts printing for arch specific interrupts |
6b39ba77 | 60 | */ |
517e4981 | 61 | int arch_show_interrupts(struct seq_file *p, int prec) |
6b39ba77 TG |
62 | { |
63 | int j; | |
64 | ||
7a81d9a7 | 65 | seq_printf(p, "%*s: ", prec, "NMI"); |
6b39ba77 TG |
66 | for_each_online_cpu(j) |
67 | seq_printf(p, "%10u ", irq_stats(j)->__nmi_count); | |
3736708f | 68 | seq_puts(p, " Non-maskable interrupts\n"); |
6b39ba77 | 69 | #ifdef CONFIG_X86_LOCAL_APIC |
7a81d9a7 | 70 | seq_printf(p, "%*s: ", prec, "LOC"); |
6b39ba77 TG |
71 | for_each_online_cpu(j) |
72 | seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs); | |
3736708f | 73 | seq_puts(p, " Local timer interrupts\n"); |
474e56b8 JSR |
74 | |
75 | seq_printf(p, "%*s: ", prec, "SPU"); | |
76 | for_each_online_cpu(j) | |
77 | seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count); | |
3736708f | 78 | seq_puts(p, " Spurious interrupts\n"); |
89ccf465 | 79 | seq_printf(p, "%*s: ", prec, "PMI"); |
241771ef IM |
80 | for_each_online_cpu(j) |
81 | seq_printf(p, "%10u ", irq_stats(j)->apic_perf_irqs); | |
3736708f | 82 | seq_puts(p, " Performance monitoring interrupts\n"); |
e360adbe | 83 | seq_printf(p, "%*s: ", prec, "IWI"); |
b6276f35 | 84 | for_each_online_cpu(j) |
e360adbe | 85 | seq_printf(p, "%10u ", irq_stats(j)->apic_irq_work_irqs); |
3736708f | 86 | seq_puts(p, " IRQ work interrupts\n"); |
346b46be FLVC |
87 | seq_printf(p, "%*s: ", prec, "RTR"); |
88 | for_each_online_cpu(j) | |
b49d7d87 | 89 | seq_printf(p, "%10u ", irq_stats(j)->icr_read_retry_count); |
3736708f | 90 | seq_puts(p, " APIC ICR read retries\n"); |
6b39ba77 | 91 | #endif |
4a4de9c7 | 92 | if (x86_platform_ipi_callback) { |
59d13812 | 93 | seq_printf(p, "%*s: ", prec, "PLT"); |
acaabe79 | 94 | for_each_online_cpu(j) |
4a4de9c7 | 95 | seq_printf(p, "%10u ", irq_stats(j)->x86_platform_ipis); |
3736708f | 96 | seq_puts(p, " Platform interrupts\n"); |
acaabe79 | 97 | } |
6b39ba77 | 98 | #ifdef CONFIG_SMP |
7a81d9a7 | 99 | seq_printf(p, "%*s: ", prec, "RES"); |
6b39ba77 TG |
100 | for_each_online_cpu(j) |
101 | seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count); | |
3736708f | 102 | seq_puts(p, " Rescheduling interrupts\n"); |
7a81d9a7 | 103 | seq_printf(p, "%*s: ", prec, "CAL"); |
6b39ba77 | 104 | for_each_online_cpu(j) |
82ba4fac | 105 | seq_printf(p, "%10u ", irq_stats(j)->irq_call_count); |
3736708f | 106 | seq_puts(p, " Function call interrupts\n"); |
7a81d9a7 | 107 | seq_printf(p, "%*s: ", prec, "TLB"); |
6b39ba77 TG |
108 | for_each_online_cpu(j) |
109 | seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count); | |
3736708f | 110 | seq_puts(p, " TLB shootdowns\n"); |
6b39ba77 | 111 | #endif |
0444c9bd | 112 | #ifdef CONFIG_X86_THERMAL_VECTOR |
7a81d9a7 | 113 | seq_printf(p, "%*s: ", prec, "TRM"); |
6b39ba77 TG |
114 | for_each_online_cpu(j) |
115 | seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count); | |
3736708f | 116 | seq_puts(p, " Thermal event interrupts\n"); |
0444c9bd JB |
117 | #endif |
118 | #ifdef CONFIG_X86_MCE_THRESHOLD | |
7a81d9a7 | 119 | seq_printf(p, "%*s: ", prec, "THR"); |
6b39ba77 TG |
120 | for_each_online_cpu(j) |
121 | seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count); | |
3736708f | 122 | seq_puts(p, " Threshold APIC interrupts\n"); |
01ca79f1 | 123 | #endif |
24fd78a8 AG |
124 | #ifdef CONFIG_X86_MCE_AMD |
125 | seq_printf(p, "%*s: ", prec, "DFR"); | |
126 | for_each_online_cpu(j) | |
127 | seq_printf(p, "%10u ", irq_stats(j)->irq_deferred_error_count); | |
128 | seq_puts(p, " Deferred Error APIC interrupts\n"); | |
129 | #endif | |
c1ebf835 | 130 | #ifdef CONFIG_X86_MCE |
01ca79f1 AK |
131 | seq_printf(p, "%*s: ", prec, "MCE"); |
132 | for_each_online_cpu(j) | |
133 | seq_printf(p, "%10u ", per_cpu(mce_exception_count, j)); | |
3736708f | 134 | seq_puts(p, " Machine check exceptions\n"); |
ca84f696 AK |
135 | seq_printf(p, "%*s: ", prec, "MCP"); |
136 | for_each_online_cpu(j) | |
137 | seq_printf(p, "%10u ", per_cpu(mce_poll_count, j)); | |
3736708f | 138 | seq_puts(p, " Machine check polls\n"); |
6b39ba77 | 139 | #endif |
f704a7d7 | 140 | #if IS_ENABLED(CONFIG_HYPERV) || defined(CONFIG_XEN) |
9d87cd61 VK |
141 | if (test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors)) { |
142 | seq_printf(p, "%*s: ", prec, "HYP"); | |
143 | for_each_online_cpu(j) | |
144 | seq_printf(p, "%10u ", | |
145 | irq_stats(j)->irq_hv_callback_count); | |
146 | seq_puts(p, " Hypervisor callback interrupts\n"); | |
147 | } | |
929320e4 | 148 | #endif |
7a81d9a7 | 149 | seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); |
6b39ba77 | 150 | #if defined(CONFIG_X86_IO_APIC) |
7a81d9a7 | 151 | seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count)); |
501b3265 FW |
152 | #endif |
153 | #ifdef CONFIG_HAVE_KVM | |
154 | seq_printf(p, "%*s: ", prec, "PIN"); | |
155 | for_each_online_cpu(j) | |
156 | seq_printf(p, "%10u ", irq_stats(j)->kvm_posted_intr_ipis); | |
157 | seq_puts(p, " Posted-interrupt notification event\n"); | |
158 | ||
159 | seq_printf(p, "%*s: ", prec, "PIW"); | |
160 | for_each_online_cpu(j) | |
161 | seq_printf(p, "%10u ", | |
162 | irq_stats(j)->kvm_posted_intr_wakeup_ipis); | |
163 | seq_puts(p, " Posted-interrupt wakeup event\n"); | |
6b39ba77 TG |
164 | #endif |
165 | return 0; | |
166 | } | |
167 | ||
6b39ba77 TG |
168 | /* |
169 | * /proc/stat helpers | |
170 | */ | |
171 | u64 arch_irq_stat_cpu(unsigned int cpu) | |
172 | { | |
173 | u64 sum = irq_stats(cpu)->__nmi_count; | |
174 | ||
175 | #ifdef CONFIG_X86_LOCAL_APIC | |
176 | sum += irq_stats(cpu)->apic_timer_irqs; | |
474e56b8 | 177 | sum += irq_stats(cpu)->irq_spurious_count; |
241771ef | 178 | sum += irq_stats(cpu)->apic_perf_irqs; |
e360adbe | 179 | sum += irq_stats(cpu)->apic_irq_work_irqs; |
b49d7d87 | 180 | sum += irq_stats(cpu)->icr_read_retry_count; |
6b39ba77 | 181 | #endif |
4a4de9c7 DS |
182 | if (x86_platform_ipi_callback) |
183 | sum += irq_stats(cpu)->x86_platform_ipis; | |
6b39ba77 TG |
184 | #ifdef CONFIG_SMP |
185 | sum += irq_stats(cpu)->irq_resched_count; | |
186 | sum += irq_stats(cpu)->irq_call_count; | |
6b39ba77 | 187 | #endif |
0444c9bd | 188 | #ifdef CONFIG_X86_THERMAL_VECTOR |
6b39ba77 | 189 | sum += irq_stats(cpu)->irq_thermal_count; |
0444c9bd JB |
190 | #endif |
191 | #ifdef CONFIG_X86_MCE_THRESHOLD | |
6b39ba77 | 192 | sum += irq_stats(cpu)->irq_threshold_count; |
8051dbd2 | 193 | #endif |
c1ebf835 | 194 | #ifdef CONFIG_X86_MCE |
8051dbd2 HS |
195 | sum += per_cpu(mce_exception_count, cpu); |
196 | sum += per_cpu(mce_poll_count, cpu); | |
6b39ba77 TG |
197 | #endif |
198 | return sum; | |
199 | } | |
200 | ||
201 | u64 arch_irq_stat(void) | |
202 | { | |
203 | u64 sum = atomic_read(&irq_err_count); | |
6b39ba77 TG |
204 | return sum; |
205 | } | |
c3d80000 | 206 | |
7c1d7cdc JF |
207 | |
208 | /* | |
209 | * do_IRQ handles all normal device IRQ's (the special | |
210 | * SMP cross-CPU interrupts have their own specific | |
211 | * handlers). | |
212 | */ | |
1d9090e2 | 213 | __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs) |
7c1d7cdc JF |
214 | { |
215 | struct pt_regs *old_regs = set_irq_regs(regs); | |
a782a7e4 | 216 | struct irq_desc * desc; |
7c1d7cdc JF |
217 | /* high bit used in ret_from_ code */ |
218 | unsigned vector = ~regs->orig_ax; | |
7c1d7cdc | 219 | |
0333a209 AL |
220 | /* |
221 | * NB: Unlike exception entries, IRQ entries do not reliably | |
222 | * handle context tracking in the low-level entry code. This is | |
223 | * because syscall entries execute briefly with IRQs on before | |
224 | * updating context tracking state, so we can take an IRQ from | |
225 | * kernel mode with CONTEXT_USER. The low-level entry code only | |
226 | * updates the context if we came from user mode, so we won't | |
227 | * switch to CONTEXT_KERNEL. We'll fix that once the syscall | |
228 | * code is cleaned up enough that we can cleanly defer enabling | |
229 | * IRQs. | |
230 | */ | |
231 | ||
6af7faf6 | 232 | entering_irq(); |
7c1d7cdc | 233 | |
0333a209 | 234 | /* entering_irq() tells RCU that we're not quiescent. Check it. */ |
5778077d | 235 | RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU"); |
0333a209 | 236 | |
a782a7e4 | 237 | desc = __this_cpu_read(vector_irq[vector]); |
7c1d7cdc | 238 | |
a782a7e4 | 239 | if (!handle_irq(desc, regs)) { |
08306ce6 | 240 | ack_APIC_irq(); |
7c1d7cdc | 241 | |
a782a7e4 TG |
242 | if (desc != VECTOR_RETRIGGERED) { |
243 | pr_emerg_ratelimited("%s: %d.%d No irq handler for vector\n", | |
9345005f | 244 | __func__, smp_processor_id(), |
a782a7e4 | 245 | vector); |
9345005f | 246 | } else { |
7276c6a2 | 247 | __this_cpu_write(vector_irq[vector], VECTOR_UNUSED); |
9345005f | 248 | } |
7c1d7cdc JF |
249 | } |
250 | ||
6af7faf6 | 251 | exiting_irq(); |
7c1d7cdc JF |
252 | |
253 | set_irq_regs(old_regs); | |
254 | return 1; | |
255 | } | |
256 | ||
acaabe79 | 257 | /* |
4a4de9c7 | 258 | * Handler for X86_PLATFORM_IPI_VECTOR. |
acaabe79 | 259 | */ |
eddc0e92 | 260 | void __smp_x86_platform_ipi(void) |
acaabe79 | 261 | { |
4a4de9c7 | 262 | inc_irq_stat(x86_platform_ipis); |
acaabe79 | 263 | |
4a4de9c7 DS |
264 | if (x86_platform_ipi_callback) |
265 | x86_platform_ipi_callback(); | |
eddc0e92 | 266 | } |
acaabe79 | 267 | |
1d9090e2 | 268 | __visible void smp_x86_platform_ipi(struct pt_regs *regs) |
eddc0e92 SA |
269 | { |
270 | struct pt_regs *old_regs = set_irq_regs(regs); | |
acaabe79 | 271 | |
eddc0e92 SA |
272 | entering_ack_irq(); |
273 | __smp_x86_platform_ipi(); | |
274 | exiting_irq(); | |
acaabe79 DS |
275 | set_irq_regs(old_regs); |
276 | } | |
277 | ||
d78f2664 | 278 | #ifdef CONFIG_HAVE_KVM |
f6b3c72c FW |
279 | static void dummy_handler(void) {} |
280 | static void (*kvm_posted_intr_wakeup_handler)(void) = dummy_handler; | |
281 | ||
282 | void kvm_set_posted_intr_wakeup_handler(void (*handler)(void)) | |
283 | { | |
284 | if (handler) | |
285 | kvm_posted_intr_wakeup_handler = handler; | |
286 | else | |
287 | kvm_posted_intr_wakeup_handler = dummy_handler; | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wakeup_handler); | |
290 | ||
d78f2664 YZ |
291 | /* |
292 | * Handler for POSTED_INTERRUPT_VECTOR. | |
293 | */ | |
1d9090e2 | 294 | __visible void smp_kvm_posted_intr_ipi(struct pt_regs *regs) |
d78f2664 YZ |
295 | { |
296 | struct pt_regs *old_regs = set_irq_regs(regs); | |
297 | ||
6af7faf6 | 298 | entering_ack_irq(); |
d78f2664 | 299 | inc_irq_stat(kvm_posted_intr_ipis); |
f6b3c72c FW |
300 | exiting_irq(); |
301 | set_irq_regs(old_regs); | |
302 | } | |
303 | ||
304 | /* | |
305 | * Handler for POSTED_INTERRUPT_WAKEUP_VECTOR. | |
306 | */ | |
307 | __visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs) | |
308 | { | |
309 | struct pt_regs *old_regs = set_irq_regs(regs); | |
310 | ||
311 | entering_ack_irq(); | |
312 | inc_irq_stat(kvm_posted_intr_wakeup_ipis); | |
313 | kvm_posted_intr_wakeup_handler(); | |
6af7faf6 | 314 | exiting_irq(); |
d78f2664 YZ |
315 | set_irq_regs(old_regs); |
316 | } | |
317 | #endif | |
318 | ||
1d9090e2 | 319 | __visible void smp_trace_x86_platform_ipi(struct pt_regs *regs) |
cf910e83 SA |
320 | { |
321 | struct pt_regs *old_regs = set_irq_regs(regs); | |
322 | ||
323 | entering_ack_irq(); | |
324 | trace_x86_platform_ipi_entry(X86_PLATFORM_IPI_VECTOR); | |
325 | __smp_x86_platform_ipi(); | |
326 | trace_x86_platform_ipi_exit(X86_PLATFORM_IPI_VECTOR); | |
327 | exiting_irq(); | |
328 | set_irq_regs(old_regs); | |
329 | } | |
330 | ||
c3d80000 | 331 | EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq); |
7a7732bc SS |
332 | |
333 | #ifdef CONFIG_HOTPLUG_CPU | |
39424e89 PB |
334 | |
335 | /* These two declarations are only used in check_irq_vectors_for_cpu_disable() | |
336 | * below, which is protected by stop_machine(). Putting them on the stack | |
337 | * results in a stack frame overflow. Dynamically allocating could result in a | |
338 | * failure so declare these two cpumasks as global. | |
339 | */ | |
340 | static struct cpumask affinity_new, online_new; | |
341 | ||
da6139e4 PB |
342 | /* |
343 | * This cpu is going to be removed and its vectors migrated to the remaining | |
344 | * online cpus. Check to see if there are enough vectors in the remaining cpus. | |
345 | * This function is protected by stop_machine(). | |
346 | */ | |
347 | int check_irq_vectors_for_cpu_disable(void) | |
348 | { | |
da6139e4 PB |
349 | unsigned int this_cpu, vector, this_count, count; |
350 | struct irq_desc *desc; | |
351 | struct irq_data *data; | |
a782a7e4 | 352 | int cpu; |
da6139e4 PB |
353 | |
354 | this_cpu = smp_processor_id(); | |
355 | cpumask_copy(&online_new, cpu_online_mask); | |
020b37ac | 356 | cpumask_clear_cpu(this_cpu, &online_new); |
da6139e4 PB |
357 | |
358 | this_count = 0; | |
359 | for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) { | |
a782a7e4 TG |
360 | desc = __this_cpu_read(vector_irq[vector]); |
361 | if (IS_ERR_OR_NULL(desc)) | |
44825757 | 362 | continue; |
44825757 TG |
363 | /* |
364 | * Protect against concurrent action removal, affinity | |
365 | * changes etc. | |
366 | */ | |
367 | raw_spin_lock(&desc->lock); | |
368 | data = irq_desc_get_irq_data(desc); | |
a782a7e4 TG |
369 | cpumask_copy(&affinity_new, |
370 | irq_data_get_affinity_mask(data)); | |
44825757 | 371 | cpumask_clear_cpu(this_cpu, &affinity_new); |
da6139e4 | 372 | |
44825757 | 373 | /* Do not count inactive or per-cpu irqs. */ |
a782a7e4 | 374 | if (!irq_desc_has_action(desc) || irqd_is_per_cpu(data)) { |
cbb24dc7 | 375 | raw_spin_unlock(&desc->lock); |
44825757 | 376 | continue; |
da6139e4 | 377 | } |
44825757 TG |
378 | |
379 | raw_spin_unlock(&desc->lock); | |
380 | /* | |
381 | * A single irq may be mapped to multiple cpu's | |
382 | * vector_irq[] (for example IOAPIC cluster mode). In | |
383 | * this case we have two possibilities: | |
384 | * | |
385 | * 1) the resulting affinity mask is empty; that is | |
386 | * this the down'd cpu is the last cpu in the irq's | |
387 | * affinity mask, or | |
388 | * | |
389 | * 2) the resulting affinity mask is no longer a | |
390 | * subset of the online cpus but the affinity mask is | |
391 | * not zero; that is the down'd cpu is the last online | |
392 | * cpu in a user set affinity mask. | |
393 | */ | |
394 | if (cpumask_empty(&affinity_new) || | |
395 | !cpumask_subset(&affinity_new, &online_new)) | |
396 | this_count++; | |
da6139e4 PB |
397 | } |
398 | ||
399 | count = 0; | |
400 | for_each_online_cpu(cpu) { | |
401 | if (cpu == this_cpu) | |
402 | continue; | |
ac2a5539 YL |
403 | /* |
404 | * We scan from FIRST_EXTERNAL_VECTOR to first system | |
405 | * vector. If the vector is marked in the used vectors | |
406 | * bitmap or an irq is assigned to it, we don't count | |
407 | * it as available. | |
cbb24dc7 TG |
408 | * |
409 | * As this is an inaccurate snapshot anyway, we can do | |
410 | * this w/o holding vector_lock. | |
ac2a5539 YL |
411 | */ |
412 | for (vector = FIRST_EXTERNAL_VECTOR; | |
413 | vector < first_system_vector; vector++) { | |
414 | if (!test_bit(vector, used_vectors) && | |
a782a7e4 TG |
415 | IS_ERR_OR_NULL(per_cpu(vector_irq, cpu)[vector])) |
416 | count++; | |
da6139e4 PB |
417 | } |
418 | } | |
419 | ||
420 | if (count < this_count) { | |
421 | pr_warn("CPU %d disable failed: CPU has %u vectors assigned and there are only %u available.\n", | |
422 | this_cpu, this_count, count); | |
423 | return -ERANGE; | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | ||
7a7732bc SS |
428 | /* A cpu has been removed from cpu_online_mask. Reset irq affinities. */ |
429 | void fixup_irqs(void) | |
430 | { | |
5231a686 | 431 | unsigned int irq, vector; |
7a7732bc SS |
432 | static int warned; |
433 | struct irq_desc *desc; | |
a3c08e5d | 434 | struct irq_data *data; |
51c43ac6 | 435 | struct irq_chip *chip; |
fb24da80 | 436 | int ret; |
7a7732bc SS |
437 | |
438 | for_each_irq_desc(irq, desc) { | |
439 | int break_affinity = 0; | |
440 | int set_affinity = 1; | |
441 | const struct cpumask *affinity; | |
442 | ||
443 | if (!desc) | |
444 | continue; | |
445 | if (irq == 2) | |
446 | continue; | |
447 | ||
448 | /* interrupt's are disabled at this point */ | |
239007b8 | 449 | raw_spin_lock(&desc->lock); |
7a7732bc | 450 | |
51c43ac6 | 451 | data = irq_desc_get_irq_data(desc); |
c149e4cd | 452 | affinity = irq_data_get_affinity_mask(data); |
b87ba87c | 453 | if (!irq_has_action(irq) || irqd_is_per_cpu(data) || |
58bff947 | 454 | cpumask_subset(affinity, cpu_online_mask)) { |
239007b8 | 455 | raw_spin_unlock(&desc->lock); |
7a7732bc SS |
456 | continue; |
457 | } | |
458 | ||
a5e74b84 SS |
459 | /* |
460 | * Complete the irq move. This cpu is going down and for | |
461 | * non intr-remapping case, we can't wait till this interrupt | |
462 | * arrives at this cpu before completing the irq move. | |
463 | */ | |
90a2282e | 464 | irq_force_complete_move(desc); |
a5e74b84 | 465 | |
7a7732bc SS |
466 | if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) { |
467 | break_affinity = 1; | |
2530cd4f | 468 | affinity = cpu_online_mask; |
7a7732bc SS |
469 | } |
470 | ||
51c43ac6 | 471 | chip = irq_data_get_irq_chip(data); |
36f34c8c TG |
472 | /* |
473 | * The interrupt descriptor might have been cleaned up | |
474 | * already, but it is not yet removed from the radix tree | |
475 | */ | |
476 | if (!chip) { | |
477 | raw_spin_unlock(&desc->lock); | |
478 | continue; | |
479 | } | |
480 | ||
51c43ac6 TG |
481 | if (!irqd_can_move_in_process_context(data) && chip->irq_mask) |
482 | chip->irq_mask(data); | |
7a7732bc | 483 | |
fb24da80 PB |
484 | if (chip->irq_set_affinity) { |
485 | ret = chip->irq_set_affinity(data, affinity, true); | |
486 | if (ret == -ENOSPC) | |
487 | pr_crit("IRQ %d set affinity failed because there are no available vectors. The device assigned to this IRQ is unstable.\n", irq); | |
488 | } else { | |
489 | if (!(warned++)) | |
490 | set_affinity = 0; | |
491 | } | |
7a7732bc | 492 | |
99dd5497 LC |
493 | /* |
494 | * We unmask if the irq was not marked masked by the | |
495 | * core code. That respects the lazy irq disable | |
496 | * behaviour. | |
497 | */ | |
983bbf1a | 498 | if (!irqd_can_move_in_process_context(data) && |
99dd5497 | 499 | !irqd_irq_masked(data) && chip->irq_unmask) |
51c43ac6 | 500 | chip->irq_unmask(data); |
7a7732bc | 501 | |
239007b8 | 502 | raw_spin_unlock(&desc->lock); |
7a7732bc SS |
503 | |
504 | if (break_affinity && set_affinity) | |
c767a54b | 505 | pr_notice("Broke affinity for irq %i\n", irq); |
7a7732bc | 506 | else if (!set_affinity) |
c767a54b | 507 | pr_notice("Cannot set affinity for irq %i\n", irq); |
7a7732bc SS |
508 | } |
509 | ||
5231a686 SS |
510 | /* |
511 | * We can remove mdelay() and then send spuriuous interrupts to | |
512 | * new cpu targets for all the irqs that were handled previously by | |
513 | * this cpu. While it works, I have seen spurious interrupt messages | |
514 | * (nothing wrong but still...). | |
515 | * | |
516 | * So for now, retain mdelay(1) and check the IRR and then send those | |
517 | * interrupts to new targets as this cpu is already offlined... | |
518 | */ | |
7a7732bc | 519 | mdelay(1); |
5231a686 | 520 | |
09cf92b7 TG |
521 | /* |
522 | * We can walk the vector array of this cpu without holding | |
523 | * vector_lock because the cpu is already marked !online, so | |
524 | * nothing else will touch it. | |
525 | */ | |
5231a686 SS |
526 | for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) { |
527 | unsigned int irr; | |
528 | ||
a782a7e4 | 529 | if (IS_ERR_OR_NULL(__this_cpu_read(vector_irq[vector]))) |
5231a686 SS |
530 | continue; |
531 | ||
532 | irr = apic_read(APIC_IRR + (vector / 32 * 0x10)); | |
533 | if (irr & (1 << (vector % 32))) { | |
a782a7e4 | 534 | desc = __this_cpu_read(vector_irq[vector]); |
5231a686 | 535 | |
09cf92b7 | 536 | raw_spin_lock(&desc->lock); |
51c43ac6 TG |
537 | data = irq_desc_get_irq_data(desc); |
538 | chip = irq_data_get_irq_chip(data); | |
9345005f | 539 | if (chip->irq_retrigger) { |
51c43ac6 | 540 | chip->irq_retrigger(data); |
9345005f PB |
541 | __this_cpu_write(vector_irq[vector], VECTOR_RETRIGGERED); |
542 | } | |
239007b8 | 543 | raw_spin_unlock(&desc->lock); |
5231a686 | 544 | } |
9345005f | 545 | if (__this_cpu_read(vector_irq[vector]) != VECTOR_RETRIGGERED) |
7276c6a2 | 546 | __this_cpu_write(vector_irq[vector], VECTOR_UNUSED); |
5231a686 | 547 | } |
7a7732bc SS |
548 | } |
549 | #endif |