2 * linux/arch/sh/kernel/irq.c
4 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
7 * SuperH version: Copyright (C) 1999 Niibe Yutaka
10 #include <linux/interrupt.h>
11 #include <linux/module.h>
12 #include <linux/kernel_stat.h>
13 #include <linux/seq_file.h>
14 #include <linux/ftrace.h>
15 #include <linux/delay.h>
16 #include <asm/processor.h>
17 #include <asm/machvec.h>
18 #include <asm/uaccess.h>
19 #include <asm/thread_info.h>
20 #include <cpu/mmu_context.h>
22 atomic_t irq_err_count
;
25 * 'what should we do if we get a hw irq event on an illegal vector'.
26 * each architecture has to answer this themselves, it doesn't deserve
27 * a generic callback i think.
29 void ack_bad_irq(unsigned int irq
)
31 atomic_inc(&irq_err_count
);
32 printk("unexpected IRQ trap at vector %02x\n", irq
);
35 #if defined(CONFIG_PROC_FS)
37 * /proc/interrupts printing:
39 static int show_other_interrupts(struct seq_file
*p
, int prec
)
43 seq_printf(p
, "%*s: ", prec
, "NMI");
44 for_each_online_cpu(j
)
45 seq_printf(p
, "%10u ", irq_stat
[j
].__nmi_count
);
46 seq_printf(p
, " Non-maskable interrupts\n");
48 seq_printf(p
, "%*s: %10u\n", prec
, "ERR", atomic_read(&irq_err_count
));
53 int show_interrupts(struct seq_file
*p
, void *v
)
55 unsigned long flags
, any_count
= 0;
56 int i
= *(loff_t
*)v
, j
, prec
;
57 struct irqaction
*action
;
58 struct irq_desc
*desc
;
59 struct irq_data
*data
;
60 struct irq_chip
*chip
;
65 for (prec
= 3, j
= 1000; prec
< 10 && j
<= nr_irqs
; ++prec
)
69 return show_other_interrupts(p
, prec
);
72 seq_printf(p
, "%*s", prec
+ 8, "");
73 for_each_online_cpu(j
)
74 seq_printf(p
, "CPU%-8d", j
);
78 desc
= irq_to_desc(i
);
82 data
= irq_get_irq_data(i
);
83 chip
= irq_data_get_irq_chip(data
);
85 raw_spin_lock_irqsave(&desc
->lock
, flags
);
86 for_each_online_cpu(j
)
87 any_count
|= kstat_irqs_cpu(i
, j
);
88 action
= desc
->action
;
89 if (!action
&& !any_count
)
92 seq_printf(p
, "%*d: ", prec
, i
);
93 for_each_online_cpu(j
)
94 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
95 seq_printf(p
, " %14s", chip
->name
);
96 seq_printf(p
, "-%-8s", desc
->name
);
99 seq_printf(p
, " %s", action
->name
);
100 while ((action
= action
->next
) != NULL
)
101 seq_printf(p
, ", %s", action
->name
);
106 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
111 #ifdef CONFIG_IRQSTACKS
113 * per-CPU IRQ handling contexts (thread information and stack)
116 struct thread_info tinfo
;
117 u32 stack
[THREAD_SIZE
/sizeof(u32
)];
120 static union irq_ctx
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
121 static union irq_ctx
*softirq_ctx
[NR_CPUS
] __read_mostly
;
123 static char softirq_stack
[NR_CPUS
* THREAD_SIZE
] __page_aligned_bss
;
124 static char hardirq_stack
[NR_CPUS
* THREAD_SIZE
] __page_aligned_bss
;
126 static inline void handle_one_irq(unsigned int irq
)
128 union irq_ctx
*curctx
, *irqctx
;
130 curctx
= (union irq_ctx
*)current_thread_info();
131 irqctx
= hardirq_ctx
[smp_processor_id()];
134 * this is where we switch to the IRQ stack. However, if we are
135 * already using the IRQ stack (because we interrupted a hardirq
136 * handler) we can't do that and just have to keep using the
137 * current stack (which is the irq stack already after all)
139 if (curctx
!= irqctx
) {
142 isp
= (u32
*)((char *)irqctx
+ sizeof(*irqctx
));
143 irqctx
->tinfo
.task
= curctx
->tinfo
.task
;
144 irqctx
->tinfo
.previous_sp
= current_stack_pointer
;
147 * Copy the softirq bits in preempt_count so that the
148 * softirq checks work in the hardirq context.
150 irqctx
->tinfo
.preempt_count
=
151 (irqctx
->tinfo
.preempt_count
& ~SOFTIRQ_MASK
) |
152 (curctx
->tinfo
.preempt_count
& SOFTIRQ_MASK
);
154 __asm__
__volatile__ (
158 /* swith to the irq stack */
160 /* restore the stack (ring zero) */
163 : "r" (irq
), "r" (generic_handle_irq
), "r" (isp
)
164 : "memory", "r0", "r1", "r2", "r3", "r4",
165 "r5", "r6", "r7", "r8", "t", "pr"
168 generic_handle_irq(irq
);
172 * allocate per-cpu stacks for hardirq and for softirq processing
174 void irq_ctx_init(int cpu
)
176 union irq_ctx
*irqctx
;
178 if (hardirq_ctx
[cpu
])
181 irqctx
= (union irq_ctx
*)&hardirq_stack
[cpu
* THREAD_SIZE
];
182 irqctx
->tinfo
.task
= NULL
;
183 irqctx
->tinfo
.exec_domain
= NULL
;
184 irqctx
->tinfo
.cpu
= cpu
;
185 irqctx
->tinfo
.preempt_count
= HARDIRQ_OFFSET
;
186 irqctx
->tinfo
.addr_limit
= MAKE_MM_SEG(0);
188 hardirq_ctx
[cpu
] = irqctx
;
190 irqctx
= (union irq_ctx
*)&softirq_stack
[cpu
* THREAD_SIZE
];
191 irqctx
->tinfo
.task
= NULL
;
192 irqctx
->tinfo
.exec_domain
= NULL
;
193 irqctx
->tinfo
.cpu
= cpu
;
194 irqctx
->tinfo
.preempt_count
= 0;
195 irqctx
->tinfo
.addr_limit
= MAKE_MM_SEG(0);
197 softirq_ctx
[cpu
] = irqctx
;
199 printk("CPU %u irqstacks, hard=%p soft=%p\n",
200 cpu
, hardirq_ctx
[cpu
], softirq_ctx
[cpu
]);
203 void irq_ctx_exit(int cpu
)
205 hardirq_ctx
[cpu
] = NULL
;
208 asmlinkage
void do_softirq(void)
211 struct thread_info
*curctx
;
212 union irq_ctx
*irqctx
;
218 local_irq_save(flags
);
220 if (local_softirq_pending()) {
221 curctx
= current_thread_info();
222 irqctx
= softirq_ctx
[smp_processor_id()];
223 irqctx
->tinfo
.task
= curctx
->task
;
224 irqctx
->tinfo
.previous_sp
= current_stack_pointer
;
226 /* build the stack frame on the softirq stack */
227 isp
= (u32
*)((char *)irqctx
+ sizeof(*irqctx
));
229 __asm__
__volatile__ (
232 /* switch to the softirq stack */
234 /* restore the thread stack */
237 : "r" (__do_softirq
), "r" (isp
)
238 : "memory", "r0", "r1", "r2", "r3", "r4",
239 "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
243 * Shouldnt happen, we returned above if in_interrupt():
245 WARN_ON_ONCE(softirq_count());
248 local_irq_restore(flags
);
251 static inline void handle_one_irq(unsigned int irq
)
253 generic_handle_irq(irq
);
257 asmlinkage __irq_entry
int do_IRQ(unsigned int irq
, struct pt_regs
*regs
)
259 struct pt_regs
*old_regs
= set_irq_regs(regs
);
263 irq
= irq_demux(irq_lookup(irq
));
265 if (irq
!= NO_IRQ_IGNORE
) {
272 set_irq_regs(old_regs
);
277 void __init
init_IRQ(void)
281 /* Perform the machine specific initialisation */
282 if (sh_mv
.mv_init_irq
)
287 irq_ctx_init(smp_processor_id());
290 #ifdef CONFIG_SPARSE_IRQ
291 int __init
arch_probe_nr_irqs(void)
293 nr_irqs
= sh_mv
.mv_nr_irqs
;
294 return NR_IRQS_LEGACY
;
298 #ifdef CONFIG_HOTPLUG_CPU
299 static void route_irq(struct irq_data
*data
, unsigned int irq
, unsigned int cpu
)
301 struct irq_desc
*desc
= irq_to_desc(irq
);
302 struct irq_chip
*chip
= irq_data_get_irq_chip(data
);
304 printk(KERN_INFO
"IRQ%u: moving from cpu%u to cpu%u\n",
305 irq
, data
->node
, cpu
);
307 raw_spin_lock_irq(&desc
->lock
);
308 chip
->irq_set_affinity(data
, cpumask_of(cpu
), false);
309 raw_spin_unlock_irq(&desc
->lock
);
313 * The CPU has been marked offline. Migrate IRQs off this CPU. If
314 * the affinity settings do not allow other CPUs, force them onto any
317 void migrate_irqs(void)
319 unsigned int irq
, cpu
= smp_processor_id();
321 for_each_active_irq(irq
) {
322 struct irq_data
*data
= irq_get_irq_data(irq
);
324 if (data
->node
== cpu
) {
325 unsigned int newcpu
= cpumask_any_and(data
->affinity
,
327 if (newcpu
>= nr_cpu_ids
) {
328 if (printk_ratelimit())
329 printk(KERN_INFO
"IRQ%u no longer affine to CPU%u\n",
332 cpumask_setall(data
->affinity
);
333 newcpu
= cpumask_any_and(data
->affinity
,
337 route_irq(data
, irq
, newcpu
);