1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Derived from arch/i386/kernel/irq.c
4 * Copyright (C) 1992 Linus Torvalds
5 * Adapted from arch/i386 by Gary Thomas
6 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 * Updated and modified by Cort Dougan <cort@fsmlabs.com>
8 * Copyright (C) 1996-2001 Cort Dougan
9 * Adapted for Power Macintosh by Paul Mackerras
10 * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
12 * This file contains the code used by various IRQ handling routines:
13 * asking for different IRQ's should be done through these routines
14 * instead of just grabbing them. Thus setups with different IRQ numbers
15 * shouldn't result in any weird surprises, and installing new handlers
18 * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the
19 * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit
20 * mask register (of which only 16 are defined), hence the weird shifting
21 * and complement of the cached_irq_mask. I want to be able to stuff
22 * this right into the SIU SMASK register.
23 * Many of the prep/chrp functions are conditional compiled on CONFIG_PPC_8xx
24 * to reduce code space and undefined function references.
29 #include <linux/export.h>
30 #include <linux/threads.h>
31 #include <linux/kernel_stat.h>
32 #include <linux/signal.h>
33 #include <linux/sched.h>
34 #include <linux/ptrace.h>
35 #include <linux/ioport.h>
36 #include <linux/interrupt.h>
37 #include <linux/timex.h>
38 #include <linux/init.h>
39 #include <linux/slab.h>
40 #include <linux/delay.h>
41 #include <linux/irq.h>
42 #include <linux/seq_file.h>
43 #include <linux/cpumask.h>
44 #include <linux/profile.h>
45 #include <linux/bitops.h>
46 #include <linux/list.h>
47 #include <linux/radix-tree.h>
48 #include <linux/mutex.h>
49 #include <linux/pci.h>
50 #include <linux/debugfs.h>
52 #include <linux/of_irq.h>
53 #include <linux/vmalloc.h>
54 #include <linux/pgtable.h>
56 #include <linux/uaccess.h>
57 #include <asm/interrupt.h>
60 #include <asm/cache.h>
62 #include <asm/ptrace.h>
63 #include <asm/machdep.h>
66 #include <asm/livepatch.h>
67 #include <asm/asm-prototypes.h>
68 #include <asm/hw_irq.h>
69 #include <asm/softirq_stack.h>
73 #include <asm/firmware.h>
74 #include <asm/lv1call.h>
75 #include <asm/dbell.h>
77 #define CREATE_TRACE_POINTS
78 #include <asm/trace.h>
79 #include <asm/cpu_has_feature.h>
81 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t
, irq_stat
);
82 EXPORT_PER_CPU_SYMBOL(irq_stat
);
85 atomic_t ppc_n_lost_interrupts
;
88 extern int tau_initialized
;
89 u32
tau_interrupts(unsigned long cpu
);
91 #endif /* CONFIG_PPC32 */
95 int distribute_irqs
= 1;
97 static inline notrace
unsigned long get_irq_happened(void)
99 unsigned long happened
;
101 __asm__
__volatile__("lbz %0,%1(13)"
102 : "=r" (happened
) : "i" (offsetof(struct paca_struct
, irq_happened
)));
107 void replay_soft_interrupts(void)
112 * Be careful here, calling these interrupt handlers can cause
113 * softirqs to be raised, which they may run when calling irq_exit,
114 * which will cause local_irq_enable() to be run, which can then
115 * recurse into this function. Don't keep any state across
116 * interrupt handler calls which may change underneath us.
118 * We use local_paca rather than get_paca() to avoid all the
119 * debug_smp_processor_id() business in this low level function.
122 ppc_save_regs(®s
);
123 regs
.softe
= IRQS_ENABLED
;
127 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
))
128 WARN_ON_ONCE(mfmsr() & MSR_EE
);
131 * Force the delivery of pending soft-disabled interrupts on PS3.
132 * Any HV call will have this side effect.
134 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
136 lv1_get_version_info(&tmp
, &tmp2
);
140 * Check if an hypervisor Maintenance interrupt happened.
141 * This is a higher priority interrupt than the others, so
144 if (IS_ENABLED(CONFIG_PPC_BOOK3S
) && (local_paca
->irq_happened
& PACA_IRQ_HMI
)) {
145 local_paca
->irq_happened
&= ~PACA_IRQ_HMI
;
146 regs
.trap
= INTERRUPT_HMI
;
147 handle_hmi_exception(®s
);
148 if (!(local_paca
->irq_happened
& PACA_IRQ_HARD_DIS
))
152 if (local_paca
->irq_happened
& PACA_IRQ_DEC
) {
153 local_paca
->irq_happened
&= ~PACA_IRQ_DEC
;
154 regs
.trap
= INTERRUPT_DECREMENTER
;
155 timer_interrupt(®s
);
156 if (!(local_paca
->irq_happened
& PACA_IRQ_HARD_DIS
))
160 if (local_paca
->irq_happened
& PACA_IRQ_EE
) {
161 local_paca
->irq_happened
&= ~PACA_IRQ_EE
;
162 regs
.trap
= INTERRUPT_EXTERNAL
;
164 if (!(local_paca
->irq_happened
& PACA_IRQ_HARD_DIS
))
168 if (IS_ENABLED(CONFIG_PPC_DOORBELL
) && (local_paca
->irq_happened
& PACA_IRQ_DBELL
)) {
169 local_paca
->irq_happened
&= ~PACA_IRQ_DBELL
;
170 regs
.trap
= INTERRUPT_DOORBELL
;
171 doorbell_exception(®s
);
172 if (!(local_paca
->irq_happened
& PACA_IRQ_HARD_DIS
))
176 /* Book3E does not support soft-masking PMI interrupts */
177 if (IS_ENABLED(CONFIG_PPC_BOOK3S
) && (local_paca
->irq_happened
& PACA_IRQ_PMI
)) {
178 local_paca
->irq_happened
&= ~PACA_IRQ_PMI
;
179 regs
.trap
= INTERRUPT_PERFMON
;
180 performance_monitor_exception(®s
);
181 if (!(local_paca
->irq_happened
& PACA_IRQ_HARD_DIS
))
185 if (local_paca
->irq_happened
& ~PACA_IRQ_HARD_DIS
) {
187 * We are responding to the next interrupt, so interrupt-off
188 * latencies should be reset here.
191 trace_hardirqs_off();
196 #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_KUAP)
197 static inline void replay_soft_interrupts_irqrestore(void)
199 unsigned long kuap_state
= get_kuap();
202 * Check if anything calls local_irq_enable/restore() when KUAP is
203 * disabled (user access enabled). We handle that case here by saving
204 * and re-locking AMR but we shouldn't get here in the first place,
207 kuap_assert_locked();
209 if (kuap_state
!= AMR_KUAP_BLOCKED
)
210 set_kuap(AMR_KUAP_BLOCKED
);
212 replay_soft_interrupts();
214 if (kuap_state
!= AMR_KUAP_BLOCKED
)
215 set_kuap(kuap_state
);
218 #define replay_soft_interrupts_irqrestore() replay_soft_interrupts()
221 #ifdef CONFIG_CC_HAS_ASM_GOTO
222 notrace
void arch_local_irq_restore(unsigned long mask
)
224 unsigned char irq_happened
;
226 /* Write the new soft-enabled value if it is a disable */
228 irq_soft_mask_set(mask
);
232 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
))
233 WARN_ON_ONCE(in_nmi() || in_hardirq());
236 * After the stb, interrupts are unmasked and there are no interrupts
237 * pending replay. The restart sequence makes this atomic with
238 * respect to soft-masked interrupts. If this was just a simple code
239 * sequence, a soft-masked interrupt could become pending right after
240 * the comparison and before the stb.
242 * This allows interrupts to be unmasked without hard disabling, and
243 * also without new hard interrupts coming in ahead of pending ones.
249 " bne %l[happened] \n"
252 RESTART_TABLE(1b
, 2b
, 1b
)
253 : : "i" (offsetof(struct paca_struct
, irq_happened
)),
254 "i" (offsetof(struct paca_struct
, irq_soft_mask
))
258 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
))
259 WARN_ON_ONCE(!(mfmsr() & MSR_EE
));
264 irq_happened
= get_irq_happened();
265 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
))
266 WARN_ON_ONCE(!irq_happened
);
268 if (irq_happened
== PACA_IRQ_HARD_DIS
) {
269 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
))
270 WARN_ON_ONCE(mfmsr() & MSR_EE
);
271 irq_soft_mask_set(IRQS_ENABLED
);
272 local_paca
->irq_happened
= 0;
277 /* Have interrupts to replay, need to hard disable first */
278 if (!(irq_happened
& PACA_IRQ_HARD_DIS
)) {
279 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
)) {
280 if (!(mfmsr() & MSR_EE
)) {
282 * An interrupt could have come in and cleared
283 * MSR[EE] and set IRQ_HARD_DIS, so check
284 * IRQ_HARD_DIS again and warn if it is still
287 irq_happened
= get_irq_happened();
288 WARN_ON_ONCE(!(irq_happened
& PACA_IRQ_HARD_DIS
));
291 __hard_irq_disable();
292 local_paca
->irq_happened
|= PACA_IRQ_HARD_DIS
;
294 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
)) {
295 if (WARN_ON_ONCE(mfmsr() & MSR_EE
))
296 __hard_irq_disable();
301 * Disable preempt here, so that the below preempt_enable will
302 * perform resched if required (a replayed interrupt may set
306 irq_soft_mask_set(IRQS_ALL_DISABLED
);
307 trace_hardirqs_off();
309 replay_soft_interrupts_irqrestore();
310 local_paca
->irq_happened
= 0;
313 irq_soft_mask_set(IRQS_ENABLED
);
318 notrace
void arch_local_irq_restore(unsigned long mask
)
320 unsigned char irq_happened
;
322 /* Write the new soft-enabled value */
323 irq_soft_mask_set(mask
);
327 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
))
328 WARN_ON_ONCE(in_nmi() || in_hardirq());
331 * From this point onward, we can take interrupts, preempt,
332 * etc... unless we got hard-disabled. We check if an event
333 * happened. If none happened, we know we can just return.
335 * We may have preempted before the check below, in which case
336 * we are checking the "new" CPU instead of the old one. This
337 * is only a problem if an event happened on the "old" CPU.
339 * External interrupt events will have caused interrupts to
340 * be hard-disabled, so there is no problem, we
341 * cannot have preempted.
343 irq_happened
= get_irq_happened();
345 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
))
346 WARN_ON_ONCE(!(mfmsr() & MSR_EE
));
350 /* We need to hard disable to replay. */
351 if (!(irq_happened
& PACA_IRQ_HARD_DIS
)) {
352 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
))
353 WARN_ON_ONCE(!(mfmsr() & MSR_EE
));
354 __hard_irq_disable();
355 local_paca
->irq_happened
|= PACA_IRQ_HARD_DIS
;
358 * We should already be hard disabled here. We had bugs
359 * where that wasn't the case so let's dbl check it and
360 * warn if we are wrong. Only do that when IRQ tracing
361 * is enabled as mfmsr() can be costly.
363 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
)) {
364 if (WARN_ON_ONCE(mfmsr() & MSR_EE
))
365 __hard_irq_disable();
368 if (irq_happened
== PACA_IRQ_HARD_DIS
) {
369 local_paca
->irq_happened
= 0;
376 * Disable preempt here, so that the below preempt_enable will
377 * perform resched if required (a replayed interrupt may set
381 irq_soft_mask_set(IRQS_ALL_DISABLED
);
382 trace_hardirqs_off();
384 replay_soft_interrupts_irqrestore();
385 local_paca
->irq_happened
= 0;
388 irq_soft_mask_set(IRQS_ENABLED
);
393 EXPORT_SYMBOL(arch_local_irq_restore
);
396 * This is a helper to use when about to go into idle low-power
397 * when the latter has the side effect of re-enabling interrupts
398 * (such as calling H_CEDE under pHyp).
400 * You call this function with interrupts soft-disabled (this is
401 * already the case when ppc_md.power_save is called). The function
402 * will return whether to enter power save or just return.
404 * In the former case, it will have notified lockdep of interrupts
405 * being re-enabled and generally sanitized the lazy irq state,
406 * and in the latter case it will leave with interrupts hard
407 * disabled and marked as such, so the local_irq_enable() call
408 * in arch_cpu_idle() will properly re-enable everything.
410 bool prep_irq_for_idle(void)
413 * First we need to hard disable to ensure no interrupt
414 * occurs before we effectively enter the low power state
416 __hard_irq_disable();
417 local_paca
->irq_happened
|= PACA_IRQ_HARD_DIS
;
420 * If anything happened while we were soft-disabled,
421 * we return now and do not enter the low power state.
423 if (lazy_irq_pending())
426 /* Tell lockdep we are about to re-enable */
430 * Mark interrupts as soft-enabled and clear the
431 * PACA_IRQ_HARD_DIS from the pending mask since we
432 * are about to hard enable as well as a side effect
433 * of entering the low power state.
435 local_paca
->irq_happened
&= ~PACA_IRQ_HARD_DIS
;
436 irq_soft_mask_set(IRQS_ENABLED
);
438 /* Tell the caller to enter the low power state */
442 #ifdef CONFIG_PPC_BOOK3S
444 * This is for idle sequences that return with IRQs off, but the
445 * idle state itself wakes on interrupt. Tell the irq tracer that
446 * IRQs are enabled for the duration of idle so it does not get long
447 * off times. Must be paired with fini_irq_for_idle_irqsoff.
449 bool prep_irq_for_idle_irqsoff(void)
451 WARN_ON(!irqs_disabled());
454 * First we need to hard disable to ensure no interrupt
455 * occurs before we effectively enter the low power state
457 __hard_irq_disable();
458 local_paca
->irq_happened
|= PACA_IRQ_HARD_DIS
;
461 * If anything happened while we were soft-disabled,
462 * we return now and do not enter the low power state.
464 if (lazy_irq_pending())
467 /* Tell lockdep we are about to re-enable */
474 * Take the SRR1 wakeup reason, index into this table to find the
475 * appropriate irq_happened bit.
477 * Sytem reset exceptions taken in idle state also come through here,
478 * but they are NMI interrupts so do not need to wait for IRQs to be
479 * restored, and should be taken as early as practical. These are marked
480 * with 0xff in the table. The Power ISA specifies 0100b as the system
481 * reset interrupt reason.
483 #define IRQ_SYSTEM_RESET 0xff
485 static const u8 srr1_to_lazyirq
[0x10] = {
497 void replay_system_reset(void)
501 ppc_save_regs(®s
);
503 get_paca()->in_nmi
= 1;
504 system_reset_exception(®s
);
505 get_paca()->in_nmi
= 0;
507 EXPORT_SYMBOL_GPL(replay_system_reset
);
509 void irq_set_pending_from_srr1(unsigned long srr1
)
511 unsigned int idx
= (srr1
& SRR1_WAKEMASK_P8
) >> 18;
512 u8 reason
= srr1_to_lazyirq
[idx
];
515 * Take the system reset now, which is immediately after registers
516 * are restored from idle. It's an NMI, so interrupts need not be
517 * re-enabled before it is taken.
519 if (unlikely(reason
== IRQ_SYSTEM_RESET
)) {
520 replay_system_reset();
524 if (reason
== PACA_IRQ_DBELL
) {
526 * When doorbell triggers a system reset wakeup, the message
527 * is not cleared, so if the doorbell interrupt is replayed
528 * and the IPI handled, the doorbell interrupt would still
529 * fire when EE is enabled.
531 * To avoid taking the superfluous doorbell interrupt,
532 * execute a msgclr here before the interrupt is replayed.
534 ppc_msgclr(PPC_DBELL_MSGTYPE
);
538 * The 0 index (SRR1[42:45]=b0000) must always evaluate to 0,
539 * so this can be called unconditionally with the SRR1 wake
540 * reason as returned by the idle code, which uses 0 to mean no
543 * If a future CPU was to designate this as an interrupt reason,
544 * then a new index for no interrupt must be assigned.
546 local_paca
->irq_happened
|= reason
;
548 #endif /* CONFIG_PPC_BOOK3S */
551 * Force a replay of the external interrupt handler on this CPU.
553 void force_external_irq_replay(void)
556 * This must only be called with interrupts soft-disabled,
557 * the replay will happen when re-enabling.
559 WARN_ON(!arch_irqs_disabled());
562 * Interrupts must always be hard disabled before irq_happened is
563 * modified (to prevent lost update in case of interrupt between
566 __hard_irq_disable();
567 local_paca
->irq_happened
|= PACA_IRQ_HARD_DIS
;
569 /* Indicate in the PACA that we have an interrupt to replay */
570 local_paca
->irq_happened
|= PACA_IRQ_EE
;
573 #endif /* CONFIG_PPC64 */
575 int arch_show_interrupts(struct seq_file
*p
, int prec
)
579 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
580 if (tau_initialized
) {
581 seq_printf(p
, "%*s: ", prec
, "TAU");
582 for_each_online_cpu(j
)
583 seq_printf(p
, "%10u ", tau_interrupts(j
));
584 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
586 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
588 seq_printf(p
, "%*s: ", prec
, "LOC");
589 for_each_online_cpu(j
)
590 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).timer_irqs_event
);
591 seq_printf(p
, " Local timer interrupts for timer event device\n");
593 seq_printf(p
, "%*s: ", prec
, "BCT");
594 for_each_online_cpu(j
)
595 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).broadcast_irqs_event
);
596 seq_printf(p
, " Broadcast timer interrupts for timer event device\n");
598 seq_printf(p
, "%*s: ", prec
, "LOC");
599 for_each_online_cpu(j
)
600 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).timer_irqs_others
);
601 seq_printf(p
, " Local timer interrupts for others\n");
603 seq_printf(p
, "%*s: ", prec
, "SPU");
604 for_each_online_cpu(j
)
605 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).spurious_irqs
);
606 seq_printf(p
, " Spurious interrupts\n");
608 seq_printf(p
, "%*s: ", prec
, "PMI");
609 for_each_online_cpu(j
)
610 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).pmu_irqs
);
611 seq_printf(p
, " Performance monitoring interrupts\n");
613 seq_printf(p
, "%*s: ", prec
, "MCE");
614 for_each_online_cpu(j
)
615 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).mce_exceptions
);
616 seq_printf(p
, " Machine check exceptions\n");
618 #ifdef CONFIG_PPC_BOOK3S_64
619 if (cpu_has_feature(CPU_FTR_HVMODE
)) {
620 seq_printf(p
, "%*s: ", prec
, "HMI");
621 for_each_online_cpu(j
)
622 seq_printf(p
, "%10u ", paca_ptrs
[j
]->hmi_irqs
);
623 seq_printf(p
, " Hypervisor Maintenance Interrupts\n");
627 seq_printf(p
, "%*s: ", prec
, "NMI");
628 for_each_online_cpu(j
)
629 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).sreset_irqs
);
630 seq_printf(p
, " System Reset interrupts\n");
632 #ifdef CONFIG_PPC_WATCHDOG
633 seq_printf(p
, "%*s: ", prec
, "WDG");
634 for_each_online_cpu(j
)
635 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).soft_nmi_irqs
);
636 seq_printf(p
, " Watchdog soft-NMI interrupts\n");
639 #ifdef CONFIG_PPC_DOORBELL
640 if (cpu_has_feature(CPU_FTR_DBELL
)) {
641 seq_printf(p
, "%*s: ", prec
, "DBL");
642 for_each_online_cpu(j
)
643 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).doorbell_irqs
);
644 seq_printf(p
, " Doorbell interrupts\n");
654 u64
arch_irq_stat_cpu(unsigned int cpu
)
656 u64 sum
= per_cpu(irq_stat
, cpu
).timer_irqs_event
;
658 sum
+= per_cpu(irq_stat
, cpu
).broadcast_irqs_event
;
659 sum
+= per_cpu(irq_stat
, cpu
).pmu_irqs
;
660 sum
+= per_cpu(irq_stat
, cpu
).mce_exceptions
;
661 sum
+= per_cpu(irq_stat
, cpu
).spurious_irqs
;
662 sum
+= per_cpu(irq_stat
, cpu
).timer_irqs_others
;
663 #ifdef CONFIG_PPC_BOOK3S_64
664 sum
+= paca_ptrs
[cpu
]->hmi_irqs
;
666 sum
+= per_cpu(irq_stat
, cpu
).sreset_irqs
;
667 #ifdef CONFIG_PPC_WATCHDOG
668 sum
+= per_cpu(irq_stat
, cpu
).soft_nmi_irqs
;
670 #ifdef CONFIG_PPC_DOORBELL
671 sum
+= per_cpu(irq_stat
, cpu
).doorbell_irqs
;
677 static inline void check_stack_overflow(void)
681 if (!IS_ENABLED(CONFIG_DEBUG_STACKOVERFLOW
))
684 sp
= current_stack_pointer
& (THREAD_SIZE
- 1);
686 /* check for stack overflow: is there less than 2KB free? */
687 if (unlikely(sp
< 2048)) {
688 pr_err("do_IRQ: stack overflow: %ld\n", sp
);
693 static __always_inline
void call_do_softirq(const void *sp
)
695 /* Temporarily switch r1 to sp, call __do_softirq() then restore r1. */
697 PPC_STLU
" %%r1, %[offset](%[sp]) ;"
700 PPC_LL
" %%r1, 0(%%r1) ;"
703 [sp
] "b" (sp
), [offset
] "i" (THREAD_SIZE
- STACK_FRAME_OVERHEAD
),
704 [callee
] "i" (__do_softirq
)
706 "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6",
707 "cr7", "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
712 static __always_inline
void call_do_irq(struct pt_regs
*regs
, void *sp
)
714 register unsigned long r3
asm("r3") = (unsigned long)regs
;
716 /* Temporarily switch r1 to sp, call __do_irq() then restore r1. */
718 PPC_STLU
" %%r1, %[offset](%[sp]) ;"
721 PPC_LL
" %%r1, 0(%%r1) ;"
725 [sp
] "b" (sp
), [offset
] "i" (THREAD_SIZE
- STACK_FRAME_OVERHEAD
),
726 [callee
] "i" (__do_irq
)
728 "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6",
729 "cr7", "r0", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
734 void __do_irq(struct pt_regs
*regs
)
738 trace_irq_entry(regs
);
741 * Query the platform PIC for the interrupt & ack it.
743 * This will typically lower the interrupt line to the CPU
745 irq
= ppc_md
.get_irq();
747 /* We can hard enable interrupts now to allow perf interrupts */
748 may_hard_irq_enable();
750 /* And finally process it */
752 __this_cpu_inc(irq_stat
.spurious_irqs
);
754 generic_handle_irq(irq
);
756 trace_irq_exit(regs
);
759 void __do_IRQ(struct pt_regs
*regs
)
761 struct pt_regs
*old_regs
= set_irq_regs(regs
);
762 void *cursp
, *irqsp
, *sirqsp
;
764 /* Switch to the irq stack to handle this */
765 cursp
= (void *)(current_stack_pointer
& ~(THREAD_SIZE
- 1));
766 irqsp
= hardirq_ctx
[raw_smp_processor_id()];
767 sirqsp
= softirq_ctx
[raw_smp_processor_id()];
769 check_stack_overflow();
771 /* Already there ? */
772 if (unlikely(cursp
== irqsp
|| cursp
== sirqsp
)) {
774 set_irq_regs(old_regs
);
777 /* Switch stack and call */
778 call_do_irq(regs
, irqsp
);
780 set_irq_regs(old_regs
);
783 DEFINE_INTERRUPT_HANDLER_ASYNC(do_IRQ
)
788 static void *__init
alloc_vm_stack(void)
790 return __vmalloc_node(THREAD_SIZE
, THREAD_ALIGN
, THREADINFO_GFP
,
791 NUMA_NO_NODE
, (void *)_RET_IP_
);
794 static void __init
vmap_irqstack_init(void)
798 for_each_possible_cpu(i
) {
799 softirq_ctx
[i
] = alloc_vm_stack();
800 hardirq_ctx
[i
] = alloc_vm_stack();
805 void __init
init_IRQ(void)
807 if (IS_ENABLED(CONFIG_VMAP_STACK
))
808 vmap_irqstack_init();
814 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
815 void *critirq_ctx
[NR_CPUS
] __read_mostly
;
816 void *dbgirq_ctx
[NR_CPUS
] __read_mostly
;
817 void *mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
820 void *softirq_ctx
[NR_CPUS
] __read_mostly
;
821 void *hardirq_ctx
[NR_CPUS
] __read_mostly
;
823 void do_softirq_own_stack(void)
825 call_do_softirq(softirq_ctx
[smp_processor_id()]);
828 irq_hw_number_t
virq_to_hw(unsigned int virq
)
830 struct irq_data
*irq_data
= irq_get_irq_data(virq
);
831 return WARN_ON(!irq_data
) ? 0 : irq_data
->hwirq
;
833 EXPORT_SYMBOL_GPL(virq_to_hw
);
836 int irq_choose_cpu(const struct cpumask
*mask
)
840 if (cpumask_equal(mask
, cpu_online_mask
)) {
841 static int irq_rover
;
842 static DEFINE_RAW_SPINLOCK(irq_rover_lock
);
845 /* Round-robin distribution... */
847 raw_spin_lock_irqsave(&irq_rover_lock
, flags
);
849 irq_rover
= cpumask_next(irq_rover
, cpu_online_mask
);
850 if (irq_rover
>= nr_cpu_ids
)
851 irq_rover
= cpumask_first(cpu_online_mask
);
855 raw_spin_unlock_irqrestore(&irq_rover_lock
, flags
);
857 cpuid
= cpumask_first_and(mask
, cpu_online_mask
);
858 if (cpuid
>= nr_cpu_ids
)
862 return get_hard_smp_processor_id(cpuid
);
865 int irq_choose_cpu(const struct cpumask
*mask
)
867 return hard_smp_processor_id();
872 static int __init
setup_noirqdistrib(char *str
)
878 __setup("noirqdistrib", setup_noirqdistrib
);
879 #endif /* CONFIG_PPC64 */