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Linux/arch/ia64/kernel/irq_ia64.c

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  1 /*
  2  * linux/arch/ia64/kernel/irq_ia64.c
  3  *
  4  * Copyright (C) 1998-2001 Hewlett-Packard Co
  5  *      Stephane Eranian <eranian@hpl.hp.com>
  6  *      David Mosberger-Tang <davidm@hpl.hp.com>
  7  *
  8  *  6/10/99: Updated to bring in sync with x86 version to facilitate
  9  *           support for SMP and different interrupt controllers.
 10  *
 11  * 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector
 12  *                      PCI to vector allocation routine.
 13  * 04/14/2004 Ashok Raj <ashok.raj@intel.com>
 14  *                                              Added CPU Hotplug handling for IPF.
 15  */
 16 
 17 #include <linux/module.h>
 18 
 19 #include <linux/jiffies.h>
 20 #include <linux/errno.h>
 21 #include <linux/init.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/ioport.h>
 24 #include <linux/kernel_stat.h>
 25 #include <linux/ptrace.h>
 26 #include <linux/signal.h>
 27 #include <linux/smp.h>
 28 #include <linux/threads.h>
 29 #include <linux/bitops.h>
 30 #include <linux/irq.h>
 31 #include <linux/ratelimit.h>
 32 #include <linux/acpi.h>
 33 #include <linux/sched.h>
 34 
 35 #include <asm/delay.h>
 36 #include <asm/intrinsics.h>
 37 #include <asm/io.h>
 38 #include <asm/hw_irq.h>
 39 #include <asm/machvec.h>
 40 #include <asm/pgtable.h>
 41 #include <asm/tlbflush.h>
 42 
 43 #ifdef CONFIG_PERFMON
 44 # include <asm/perfmon.h>
 45 #endif
 46 
 47 #define IRQ_DEBUG       0
 48 
 49 #define IRQ_VECTOR_UNASSIGNED   (0)
 50 
 51 #define IRQ_UNUSED              (0)
 52 #define IRQ_USED                (1)
 53 #define IRQ_RSVD                (2)
 54 
 55 /* These can be overridden in platform_irq_init */
 56 int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR;
 57 int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR;
 58 
 59 /* default base addr of IPI table */
 60 void __iomem *ipi_base_addr = ((void __iomem *)
 61                                (__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR));
 62 
 63 static cpumask_t vector_allocation_domain(int cpu);
 64 
 65 /*
 66  * Legacy IRQ to IA-64 vector translation table.
 67  */
 68 __u8 isa_irq_to_vector_map[16] = {
 69         /* 8259 IRQ translation, first 16 entries */
 70         0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29,
 71         0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21
 72 };
 73 EXPORT_SYMBOL(isa_irq_to_vector_map);
 74 
 75 DEFINE_SPINLOCK(vector_lock);
 76 
 77 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
 78         [0 ... NR_IRQS - 1] = {
 79                 .vector = IRQ_VECTOR_UNASSIGNED,
 80                 .domain = CPU_MASK_NONE
 81         }
 82 };
 83 
 84 DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = {
 85         [0 ... IA64_NUM_VECTORS - 1] = -1
 86 };
 87 
 88 static cpumask_t vector_table[IA64_NUM_VECTORS] = {
 89         [0 ... IA64_NUM_VECTORS - 1] = CPU_MASK_NONE
 90 };
 91 
 92 static int irq_status[NR_IRQS] = {
 93         [0 ... NR_IRQS -1] = IRQ_UNUSED
 94 };
 95 
 96 int check_irq_used(int irq)
 97 {
 98         if (irq_status[irq] == IRQ_USED)
 99                 return 1;
100 
101         return -1;
102 }
103 
104 static inline int find_unassigned_irq(void)
105 {
106         int irq;
107 
108         for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++)
109                 if (irq_status[irq] == IRQ_UNUSED)
110                         return irq;
111         return -ENOSPC;
112 }
113 
114 static inline int find_unassigned_vector(cpumask_t domain)
115 {
116         cpumask_t mask;
117         int pos, vector;
118 
119         cpumask_and(&mask, &domain, cpu_online_mask);
120         if (cpus_empty(mask))
121                 return -EINVAL;
122 
123         for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) {
124                 vector = IA64_FIRST_DEVICE_VECTOR + pos;
125                 cpus_and(mask, domain, vector_table[vector]);
126                 if (!cpus_empty(mask))
127                         continue;
128                 return vector;
129         }
130         return -ENOSPC;
131 }
132 
133 static int __bind_irq_vector(int irq, int vector, cpumask_t domain)
134 {
135         cpumask_t mask;
136         int cpu;
137         struct irq_cfg *cfg = &irq_cfg[irq];
138 
139         BUG_ON((unsigned)irq >= NR_IRQS);
140         BUG_ON((unsigned)vector >= IA64_NUM_VECTORS);
141 
142         cpumask_and(&mask, &domain, cpu_online_mask);
143         if (cpus_empty(mask))
144                 return -EINVAL;
145         if ((cfg->vector == vector) && cpus_equal(cfg->domain, domain))
146                 return 0;
147         if (cfg->vector != IRQ_VECTOR_UNASSIGNED)
148                 return -EBUSY;
149         for_each_cpu_mask(cpu, mask)
150                 per_cpu(vector_irq, cpu)[vector] = irq;
151         cfg->vector = vector;
152         cfg->domain = domain;
153         irq_status[irq] = IRQ_USED;
154         cpus_or(vector_table[vector], vector_table[vector], domain);
155         return 0;
156 }
157 
158 int bind_irq_vector(int irq, int vector, cpumask_t domain)
159 {
160         unsigned long flags;
161         int ret;
162 
163         spin_lock_irqsave(&vector_lock, flags);
164         ret = __bind_irq_vector(irq, vector, domain);
165         spin_unlock_irqrestore(&vector_lock, flags);
166         return ret;
167 }
168 
169 static void __clear_irq_vector(int irq)
170 {
171         int vector, cpu;
172         cpumask_t mask;
173         cpumask_t domain;
174         struct irq_cfg *cfg = &irq_cfg[irq];
175 
176         BUG_ON((unsigned)irq >= NR_IRQS);
177         BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);
178         vector = cfg->vector;
179         domain = cfg->domain;
180         cpumask_and(&mask, &cfg->domain, cpu_online_mask);
181         for_each_cpu_mask(cpu, mask)
182                 per_cpu(vector_irq, cpu)[vector] = -1;
183         cfg->vector = IRQ_VECTOR_UNASSIGNED;
184         cfg->domain = CPU_MASK_NONE;
185         irq_status[irq] = IRQ_UNUSED;
186         cpus_andnot(vector_table[vector], vector_table[vector], domain);
187 }
188 
189 static void clear_irq_vector(int irq)
190 {
191         unsigned long flags;
192 
193         spin_lock_irqsave(&vector_lock, flags);
194         __clear_irq_vector(irq);
195         spin_unlock_irqrestore(&vector_lock, flags);
196 }
197 
198 int
199 ia64_native_assign_irq_vector (int irq)
200 {
201         unsigned long flags;
202         int vector, cpu;
203         cpumask_t domain = CPU_MASK_NONE;
204 
205         vector = -ENOSPC;
206 
207         spin_lock_irqsave(&vector_lock, flags);
208         for_each_online_cpu(cpu) {
209                 domain = vector_allocation_domain(cpu);
210                 vector = find_unassigned_vector(domain);
211                 if (vector >= 0)
212                         break;
213         }
214         if (vector < 0)
215                 goto out;
216         if (irq == AUTO_ASSIGN)
217                 irq = vector;
218         BUG_ON(__bind_irq_vector(irq, vector, domain));
219  out:
220         spin_unlock_irqrestore(&vector_lock, flags);
221         return vector;
222 }
223 
224 void
225 ia64_native_free_irq_vector (int vector)
226 {
227         if (vector < IA64_FIRST_DEVICE_VECTOR ||
228             vector > IA64_LAST_DEVICE_VECTOR)
229                 return;
230         clear_irq_vector(vector);
231 }
232 
233 int
234 reserve_irq_vector (int vector)
235 {
236         if (vector < IA64_FIRST_DEVICE_VECTOR ||
237             vector > IA64_LAST_DEVICE_VECTOR)
238                 return -EINVAL;
239         return !!bind_irq_vector(vector, vector, CPU_MASK_ALL);
240 }
241 
242 /*
243  * Initialize vector_irq on a new cpu. This function must be called
244  * with vector_lock held.
245  */
246 void __setup_vector_irq(int cpu)
247 {
248         int irq, vector;
249 
250         /* Clear vector_irq */
251         for (vector = 0; vector < IA64_NUM_VECTORS; ++vector)
252                 per_cpu(vector_irq, cpu)[vector] = -1;
253         /* Mark the inuse vectors */
254         for (irq = 0; irq < NR_IRQS; ++irq) {
255                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
256                         continue;
257                 vector = irq_to_vector(irq);
258                 per_cpu(vector_irq, cpu)[vector] = irq;
259         }
260 }
261 
262 #if defined(CONFIG_SMP) && (defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG))
263 
264 static enum vector_domain_type {
265         VECTOR_DOMAIN_NONE,
266         VECTOR_DOMAIN_PERCPU
267 } vector_domain_type = VECTOR_DOMAIN_NONE;
268 
269 static cpumask_t vector_allocation_domain(int cpu)
270 {
271         if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
272                 return cpumask_of_cpu(cpu);
273         return CPU_MASK_ALL;
274 }
275 
276 static int __irq_prepare_move(int irq, int cpu)
277 {
278         struct irq_cfg *cfg = &irq_cfg[irq];
279         int vector;
280         cpumask_t domain;
281 
282         if (cfg->move_in_progress || cfg->move_cleanup_count)
283                 return -EBUSY;
284         if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
285                 return -EINVAL;
286         if (cpu_isset(cpu, cfg->domain))
287                 return 0;
288         domain = vector_allocation_domain(cpu);
289         vector = find_unassigned_vector(domain);
290         if (vector < 0)
291                 return -ENOSPC;
292         cfg->move_in_progress = 1;
293         cfg->old_domain = cfg->domain;
294         cfg->vector = IRQ_VECTOR_UNASSIGNED;
295         cfg->domain = CPU_MASK_NONE;
296         BUG_ON(__bind_irq_vector(irq, vector, domain));
297         return 0;
298 }
299 
300 int irq_prepare_move(int irq, int cpu)
301 {
302         unsigned long flags;
303         int ret;
304 
305         spin_lock_irqsave(&vector_lock, flags);
306         ret = __irq_prepare_move(irq, cpu);
307         spin_unlock_irqrestore(&vector_lock, flags);
308         return ret;
309 }
310 
311 void irq_complete_move(unsigned irq)
312 {
313         struct irq_cfg *cfg = &irq_cfg[irq];
314         cpumask_t cleanup_mask;
315         int i;
316 
317         if (likely(!cfg->move_in_progress))
318                 return;
319 
320         if (unlikely(cpu_isset(smp_processor_id(), cfg->old_domain)))
321                 return;
322 
323         cpumask_and(&cleanup_mask, &cfg->old_domain, cpu_online_mask);
324         cfg->move_cleanup_count = cpus_weight(cleanup_mask);
325         for_each_cpu_mask(i, cleanup_mask)
326                 platform_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0);
327         cfg->move_in_progress = 0;
328 }
329 
330 static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id)
331 {
332         int me = smp_processor_id();
333         ia64_vector vector;
334         unsigned long flags;
335 
336         for (vector = IA64_FIRST_DEVICE_VECTOR;
337              vector < IA64_LAST_DEVICE_VECTOR; vector++) {
338                 int irq;
339                 struct irq_desc *desc;
340                 struct irq_cfg *cfg;
341                 irq = __get_cpu_var(vector_irq)[vector];
342                 if (irq < 0)
343                         continue;
344 
345                 desc = irq_to_desc(irq);
346                 cfg = irq_cfg + irq;
347                 raw_spin_lock(&desc->lock);
348                 if (!cfg->move_cleanup_count)
349                         goto unlock;
350 
351                 if (!cpu_isset(me, cfg->old_domain))
352                         goto unlock;
353 
354                 spin_lock_irqsave(&vector_lock, flags);
355                 __get_cpu_var(vector_irq)[vector] = -1;
356                 cpu_clear(me, vector_table[vector]);
357                 spin_unlock_irqrestore(&vector_lock, flags);
358                 cfg->move_cleanup_count--;
359         unlock:
360                 raw_spin_unlock(&desc->lock);
361         }
362         return IRQ_HANDLED;
363 }
364 
365 static struct irqaction irq_move_irqaction = {
366         .handler =      smp_irq_move_cleanup_interrupt,
367         .flags =        IRQF_DISABLED,
368         .name =         "irq_move"
369 };
370 
371 static int __init parse_vector_domain(char *arg)
372 {
373         if (!arg)
374                 return -EINVAL;
375         if (!strcmp(arg, "percpu")) {
376                 vector_domain_type = VECTOR_DOMAIN_PERCPU;
377                 no_int_routing = 1;
378         }
379         return 0;
380 }
381 early_param("vector", parse_vector_domain);
382 #else
383 static cpumask_t vector_allocation_domain(int cpu)
384 {
385         return CPU_MASK_ALL;
386 }
387 #endif
388 
389 
390 void destroy_and_reserve_irq(unsigned int irq)
391 {
392         unsigned long flags;
393 
394         dynamic_irq_cleanup(irq);
395 
396         spin_lock_irqsave(&vector_lock, flags);
397         __clear_irq_vector(irq);
398         irq_status[irq] = IRQ_RSVD;
399         spin_unlock_irqrestore(&vector_lock, flags);
400 }
401 
402 /*
403  * Dynamic irq allocate and deallocation for MSI
404  */
405 int create_irq(void)
406 {
407         unsigned long flags;
408         int irq, vector, cpu;
409         cpumask_t domain = CPU_MASK_NONE;
410 
411         irq = vector = -ENOSPC;
412         spin_lock_irqsave(&vector_lock, flags);
413         for_each_online_cpu(cpu) {
414                 domain = vector_allocation_domain(cpu);
415                 vector = find_unassigned_vector(domain);
416                 if (vector >= 0)
417                         break;
418         }
419         if (vector < 0)
420                 goto out;
421         irq = find_unassigned_irq();
422         if (irq < 0)
423                 goto out;
424         BUG_ON(__bind_irq_vector(irq, vector, domain));
425  out:
426         spin_unlock_irqrestore(&vector_lock, flags);
427         if (irq >= 0)
428                 dynamic_irq_init(irq);
429         return irq;
430 }
431 
432 void destroy_irq(unsigned int irq)
433 {
434         dynamic_irq_cleanup(irq);
435         clear_irq_vector(irq);
436 }
437 
438 #ifdef CONFIG_SMP
439 #       define IS_RESCHEDULE(vec)       (vec == IA64_IPI_RESCHEDULE)
440 #       define IS_LOCAL_TLB_FLUSH(vec)  (vec == IA64_IPI_LOCAL_TLB_FLUSH)
441 #else
442 #       define IS_RESCHEDULE(vec)       (0)
443 #       define IS_LOCAL_TLB_FLUSH(vec)  (0)
444 #endif
445 /*
446  * That's where the IVT branches when we get an external
447  * interrupt. This branches to the correct hardware IRQ handler via
448  * function ptr.
449  */
450 void
451 ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
452 {
453         struct pt_regs *old_regs = set_irq_regs(regs);
454         unsigned long saved_tpr;
455 
456 #if IRQ_DEBUG
457         {
458                 unsigned long bsp, sp;
459 
460                 /*
461                  * Note: if the interrupt happened while executing in
462                  * the context switch routine (ia64_switch_to), we may
463                  * get a spurious stack overflow here.  This is
464                  * because the register and the memory stack are not
465                  * switched atomically.
466                  */
467                 bsp = ia64_getreg(_IA64_REG_AR_BSP);
468                 sp = ia64_getreg(_IA64_REG_SP);
469 
470                 if ((sp - bsp) < 1024) {
471                         static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
472 
473                         if (__ratelimit(&ratelimit)) {
474                                 printk("ia64_handle_irq: DANGER: less than "
475                                        "1KB of free stack space!!\n"
476                                        "(bsp=0x%lx, sp=%lx)\n", bsp, sp);
477                         }
478                 }
479         }
480 #endif /* IRQ_DEBUG */
481 
482         /*
483          * Always set TPR to limit maximum interrupt nesting depth to
484          * 16 (without this, it would be ~240, which could easily lead
485          * to kernel stack overflows).
486          */
487         irq_enter();
488         saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
489         ia64_srlz_d();
490         while (vector != IA64_SPURIOUS_INT_VECTOR) {
491                 int irq = local_vector_to_irq(vector);
492                 struct irq_desc *desc = irq_to_desc(irq);
493 
494                 if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
495                         smp_local_flush_tlb();
496                         kstat_incr_irqs_this_cpu(irq, desc);
497                 } else if (unlikely(IS_RESCHEDULE(vector))) {
498                         scheduler_ipi();
499                         kstat_incr_irqs_this_cpu(irq, desc);
500                 } else {
501                         ia64_setreg(_IA64_REG_CR_TPR, vector);
502                         ia64_srlz_d();
503 
504                         if (unlikely(irq < 0)) {
505                                 printk(KERN_ERR "%s: Unexpected interrupt "
506                                        "vector %d on CPU %d is not mapped "
507                                        "to any IRQ!\n", __func__, vector,
508                                        smp_processor_id());
509                         } else
510                                 generic_handle_irq(irq);
511 
512                         /*
513                          * Disable interrupts and send EOI:
514                          */
515                         local_irq_disable();
516                         ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
517                 }
518                 ia64_eoi();
519                 vector = ia64_get_ivr();
520         }
521         /*
522          * This must be done *after* the ia64_eoi().  For example, the keyboard softirq
523          * handler needs to be able to wait for further keyboard interrupts, which can't
524          * come through until ia64_eoi() has been done.
525          */
526         irq_exit();
527         set_irq_regs(old_regs);
528 }
529 
530 #ifdef CONFIG_HOTPLUG_CPU
531 /*
532  * This function emulates a interrupt processing when a cpu is about to be
533  * brought down.
534  */
535 void ia64_process_pending_intr(void)
536 {
537         ia64_vector vector;
538         unsigned long saved_tpr;
539         extern unsigned int vectors_in_migration[NR_IRQS];
540 
541         vector = ia64_get_ivr();
542 
543         irq_enter();
544         saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
545         ia64_srlz_d();
546 
547          /*
548           * Perform normal interrupt style processing
549           */
550         while (vector != IA64_SPURIOUS_INT_VECTOR) {
551                 int irq = local_vector_to_irq(vector);
552                 struct irq_desc *desc = irq_to_desc(irq);
553 
554                 if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
555                         smp_local_flush_tlb();
556                         kstat_incr_irqs_this_cpu(irq, desc);
557                 } else if (unlikely(IS_RESCHEDULE(vector))) {
558                         kstat_incr_irqs_this_cpu(irq, desc);
559                 } else {
560                         struct pt_regs *old_regs = set_irq_regs(NULL);
561 
562                         ia64_setreg(_IA64_REG_CR_TPR, vector);
563                         ia64_srlz_d();
564 
565                         /*
566                          * Now try calling normal ia64_handle_irq as it would have got called
567                          * from a real intr handler. Try passing null for pt_regs, hopefully
568                          * it will work. I hope it works!.
569                          * Probably could shared code.
570                          */
571                         if (unlikely(irq < 0)) {
572                                 printk(KERN_ERR "%s: Unexpected interrupt "
573                                        "vector %d on CPU %d not being mapped "
574                                        "to any IRQ!!\n", __func__, vector,
575                                        smp_processor_id());
576                         } else {
577                                 vectors_in_migration[irq]=0;
578                                 generic_handle_irq(irq);
579                         }
580                         set_irq_regs(old_regs);
581 
582                         /*
583                          * Disable interrupts and send EOI
584                          */
585                         local_irq_disable();
586                         ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
587                 }
588                 ia64_eoi();
589                 vector = ia64_get_ivr();
590         }
591         irq_exit();
592 }
593 #endif
594 
595 
596 #ifdef CONFIG_SMP
597 
598 static irqreturn_t dummy_handler (int irq, void *dev_id)
599 {
600         BUG();
601 }
602 
603 static struct irqaction ipi_irqaction = {
604         .handler =      handle_IPI,
605         .flags =        IRQF_DISABLED,
606         .name =         "IPI"
607 };
608 
609 /*
610  * KVM uses this interrupt to force a cpu out of guest mode
611  */
612 static struct irqaction resched_irqaction = {
613         .handler =      dummy_handler,
614         .flags =        IRQF_DISABLED,
615         .name =         "resched"
616 };
617 
618 static struct irqaction tlb_irqaction = {
619         .handler =      dummy_handler,
620         .flags =        IRQF_DISABLED,
621         .name =         "tlb_flush"
622 };
623 
624 #endif
625 
626 void
627 ia64_native_register_percpu_irq (ia64_vector vec, struct irqaction *action)
628 {
629         unsigned int irq;
630 
631         irq = vec;
632         BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL));
633         irq_set_status_flags(irq, IRQ_PER_CPU);
634         irq_set_chip(irq, &irq_type_ia64_lsapic);
635         if (action)
636                 setup_irq(irq, action);
637         irq_set_handler(irq, handle_percpu_irq);
638 }
639 
640 void __init
641 ia64_native_register_ipi(void)
642 {
643 #ifdef CONFIG_SMP
644         register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
645         register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
646         register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction);
647 #endif
648 }
649 
650 void __init
651 init_IRQ (void)
652 {
653 #ifdef CONFIG_ACPI
654         acpi_boot_init();
655 #endif
656         ia64_register_ipi();
657         register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
658 #ifdef CONFIG_SMP
659 #if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG)
660         if (vector_domain_type != VECTOR_DOMAIN_NONE)
661                 register_percpu_irq(IA64_IRQ_MOVE_VECTOR, &irq_move_irqaction);
662 #endif
663 #endif
664 #ifdef CONFIG_PERFMON
665         pfm_init_percpu();
666 #endif
667         platform_irq_init();
668 }
669 
670 void
671 ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect)
672 {
673         void __iomem *ipi_addr;
674         unsigned long ipi_data;
675         unsigned long phys_cpu_id;
676 
677         phys_cpu_id = cpu_physical_id(cpu);
678 
679         /*
680          * cpu number is in 8bit ID and 8bit EID
681          */
682 
683         ipi_data = (delivery_mode << 8) | (vector & 0xff);
684         ipi_addr = ipi_base_addr + ((phys_cpu_id << 4) | ((redirect & 1) << 3));
685 
686         writeq(ipi_data, ipi_addr);
687 }
688 

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