[mirror_ubuntu-bionic-kernel.git] / arch / x86 / kernel / irq.c

/*
 * Common interrupt code for 32 and 64 bit
 */
#include <linux/cpu.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>

#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/smp.h>
#include <asm/irq.h>

atomic_t irq_err_count;

/*
 * 'what should we do if we get a hw irq event on an illegal vector'.
 * each architecture has to answer this themselves.
 */
void ack_bad_irq(unsigned int irq)
{
	printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);

#ifdef CONFIG_X86_LOCAL_APIC
	/*
	 * Currently unexpected vectors happen only on SMP and APIC.
	 * We _must_ ack these because every local APIC has only N
	 * irq slots per priority level, and a 'hanging, unacked' IRQ
	 * holds up an irq slot - in excessive cases (when multiple
	 * unexpected vectors occur) that might lock up the APIC
	 * completely.
	 * But only ack when the APIC is enabled -AK
	 */
	if (cpu_has_apic)
		ack_APIC_irq();
#endif
}

#ifdef CONFIG_X86_32
# define irq_stats(x)		(&per_cpu(irq_stat, x))
#else
# define irq_stats(x)		cpu_pda(x)
#endif
/*
 * /proc/interrupts printing:
 */
static int show_other_interrupts(struct seq_file *p)
{
	int j;

	seq_printf(p, "NMI: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
	seq_printf(p, "  Non-maskable interrupts\n");
#ifdef CONFIG_X86_LOCAL_APIC
	seq_printf(p, "LOC: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
	seq_printf(p, "  Local timer interrupts\n");
#endif
#ifdef CONFIG_SMP
	seq_printf(p, "RES: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
	seq_printf(p, "  Rescheduling interrupts\n");
	seq_printf(p, "CAL: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
	seq_printf(p, "  Function call interrupts\n");
	seq_printf(p, "TLB: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
	seq_printf(p, "  TLB shootdowns\n");
#endif
#ifdef CONFIG_X86_MCE
	seq_printf(p, "TRM: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
	seq_printf(p, "  Thermal event interrupts\n");
# ifdef CONFIG_X86_64
	seq_printf(p, "THR: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
	seq_printf(p, "  Threshold APIC interrupts\n");
# endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
	seq_printf(p, "SPU: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
	seq_printf(p, "  Spurious interrupts\n");
#endif
	seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
#if defined(CONFIG_X86_IO_APIC)
	seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
#endif
	return 0;
}

int show_interrupts(struct seq_file *p, void *v)
{
	unsigned long flags, any_count = 0;
	int i = *(loff_t *) v, j;
	struct irqaction *action;
	struct irq_desc *desc;

	if (i > nr_irqs)
		return 0;

	if (i == nr_irqs)
		return show_other_interrupts(p);

	/* print header */
	if (i == 0) {
		seq_printf(p, "           ");
		for_each_online_cpu(j)
			seq_printf(p, "CPU%-8d", j);
		seq_putc(p, '\n');
	}

	desc = irq_to_desc(i);
	if (!desc)
		return 0;

	spin_lock_irqsave(&desc->lock, flags);
#ifndef CONFIG_SMP
	any_count = kstat_irqs(i);
#else
	for_each_online_cpu(j)
		any_count |= kstat_irqs_cpu(i, j);
#endif
	action = desc->action;
	if (!action && !any_count)
		goto out;

	seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
	seq_printf(p, "%10u ", kstat_irqs(i));
#else
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
#endif
	seq_printf(p, " %8s", desc->chip->name);
	seq_printf(p, "-%-8s", desc->name);

	if (action) {
		seq_printf(p, "  %s", action->name);
		while ((action = action->next) != NULL)
			seq_printf(p, ", %s", action->name);
	}

	seq_putc(p, '\n');
out:
	spin_unlock_irqrestore(&desc->lock, flags);
	return 0;
}

/*
 * /proc/stat helpers
 */
u64 arch_irq_stat_cpu(unsigned int cpu)
{
	u64 sum = irq_stats(cpu)->__nmi_count;

#ifdef CONFIG_X86_LOCAL_APIC
	sum += irq_stats(cpu)->apic_timer_irqs;
#endif
#ifdef CONFIG_SMP
	sum += irq_stats(cpu)->irq_resched_count;
	sum += irq_stats(cpu)->irq_call_count;
	sum += irq_stats(cpu)->irq_tlb_count;
#endif
#ifdef CONFIG_X86_MCE
	sum += irq_stats(cpu)->irq_thermal_count;
# ifdef CONFIG_X86_64
	sum += irq_stats(cpu)->irq_threshold_count;
#endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
	sum += irq_stats(cpu)->irq_spurious_count;
#endif
	return sum;
}

u64 arch_irq_stat(void)
{
	u64 sum = atomic_read(&irq_err_count);

#ifdef CONFIG_X86_IO_APIC
	sum += atomic_read(&irq_mis_count);
#endif
	return sum;
}

EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);
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>
	7	#include <linux/seq_file.h>
	8
	9	#include <asm/apic.h>
	10	#include <asm/io_apic.h>
	11	#include <asm/smp.h>
c3d80000	12	#include <asm/irq.h>
6b39ba77 TG	13
	14	atomic_t irq_err_count;
	15
249f6d9e TG	16	/*
	17	* 'what should we do if we get a hw irq event on an illegal vector'.
	18	* each architecture has to answer this themselves.
	19	*/
	20	void ack_bad_irq(unsigned int irq)
	21	{
	22	printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);
	23
	24	#ifdef CONFIG_X86_LOCAL_APIC
	25	/*
	26	* Currently unexpected vectors happen only on SMP and APIC.
	27	* We _must_ ack these because every local APIC has only N
	28	* irq slots per priority level, and a 'hanging, unacked' IRQ
	29	* holds up an irq slot - in excessive cases (when multiple
	30	* unexpected vectors occur) that might lock up the APIC
	31	* completely.
	32	* But only ack when the APIC is enabled -AK
	33	*/
	34	if (cpu_has_apic)
	35	ack_APIC_irq();
	36	#endif
	37	}
	38
6b39ba77	39	#ifdef CONFIG_X86_32
e9f95e63	40	# define irq_stats(x) (&per_cpu(irq_stat, x))
6b39ba77 TG	41	#else
	42	# define irq_stats(x) cpu_pda(x)
	43	#endif
	44	/*
	45	* /proc/interrupts printing:
	46	*/
	47	static int show_other_interrupts(struct seq_file *p)
	48	{
	49	int j;
	50
	51	seq_printf(p, "NMI: ");
	52	for_each_online_cpu(j)
	53	seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
	54	seq_printf(p, " Non-maskable interrupts\n");
	55	#ifdef CONFIG_X86_LOCAL_APIC
	56	seq_printf(p, "LOC: ");
	57	for_each_online_cpu(j)
	58	seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
	59	seq_printf(p, " Local timer interrupts\n");
	60	#endif
	61	#ifdef CONFIG_SMP
	62	seq_printf(p, "RES: ");
	63	for_each_online_cpu(j)
	64	seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
	65	seq_printf(p, " Rescheduling interrupts\n");
	66	seq_printf(p, "CAL: ");
	67	for_each_online_cpu(j)
	68	seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
	69	seq_printf(p, " Function call interrupts\n");
	70	seq_printf(p, "TLB: ");
	71	for_each_online_cpu(j)
	72	seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
	73	seq_printf(p, " TLB shootdowns\n");
	74	#endif
	75	#ifdef CONFIG_X86_MCE
	76	seq_printf(p, "TRM: ");
	77	for_each_online_cpu(j)
	78	seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
	79	seq_printf(p, " Thermal event interrupts\n");
	80	# ifdef CONFIG_X86_64
	81	seq_printf(p, "THR: ");
	82	for_each_online_cpu(j)
	83	seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
	84	seq_printf(p, " Threshold APIC interrupts\n");
	85	# endif
	86	#endif
	87	#ifdef CONFIG_X86_LOCAL_APIC
	88	seq_printf(p, "SPU: ");
	89	for_each_online_cpu(j)
	90	seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
	91	seq_printf(p, " Spurious interrupts\n");
	92	#endif
	93	seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
	94	#if defined(CONFIG_X86_IO_APIC)
	95	seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
	96	#endif
	97	return 0;
	98	}
	99
	100	int show_interrupts(struct seq_file p, void v)
	101	{
	102	unsigned long flags, any_count = 0;
	103	int i = (loff_t ) v, j;
	104	struct irqaction *action;
105	struct irq_desc *desc;
106
107	if (i > nr_irqs)
108	return 0;
109
110	if (i == nr_irqs)
111	return show_other_interrupts(p);
112
113	/* print header */
114	if (i == 0) {
115	seq_printf(p, " ");
116	for_each_online_cpu(j)
e9f95e63	117	seq_printf(p, "CPU%-8d", j);
6b39ba77 TG	118	seq_putc(p, '\n');
	119	}
	120
	121	desc = irq_to_desc(i);
0b8f1efa YL	122	if (!desc)
	123	return 0;
	124
6b39ba77 TG	125	spin_lock_irqsave(&desc->lock, flags);
	126	#ifndef CONFIG_SMP
	127	any_count = kstat_irqs(i);
	128	#else
	129	for_each_online_cpu(j)
	130	any_count \|= kstat_irqs_cpu(i, j);
	131	#endif
	132	action = desc->action;
	133	if (!action && !any_count)
	134	goto out;
	135
	136	seq_printf(p, "%3d: ", i);
	137	#ifndef CONFIG_SMP
	138	seq_printf(p, "%10u ", kstat_irqs(i));
	139	#else
	140	for_each_online_cpu(j)
	141	seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
	142	#endif
	143	seq_printf(p, " %8s", desc->chip->name);
	144	seq_printf(p, "-%-8s", desc->name);
	145
	146	if (action) {
	147	seq_printf(p, " %s", action->name);
	148	while ((action = action->next) != NULL)
	149	seq_printf(p, ", %s", action->name);
	150	}
	151
	152	seq_putc(p, '\n');
	153	out:
	154	spin_unlock_irqrestore(&desc->lock, flags);
	155	return 0;
	156	}
	157
	158	/*
	159	* /proc/stat helpers
	160	*/
	161	u64 arch_irq_stat_cpu(unsigned int cpu)
	162	{
	163	u64 sum = irq_stats(cpu)->__nmi_count;
	164
	165	#ifdef CONFIG_X86_LOCAL_APIC
	166	sum += irq_stats(cpu)->apic_timer_irqs;
	167	#endif
	168	#ifdef CONFIG_SMP
	169	sum += irq_stats(cpu)->irq_resched_count;
	170	sum += irq_stats(cpu)->irq_call_count;
	171	sum += irq_stats(cpu)->irq_tlb_count;
	172	#endif
	173	#ifdef CONFIG_X86_MCE
	174	sum += irq_stats(cpu)->irq_thermal_count;
	175	# ifdef CONFIG_X86_64
	176	sum += irq_stats(cpu)->irq_threshold_count;
	177	#endif
	178	#endif
	179	#ifdef CONFIG_X86_LOCAL_APIC
	180	sum += irq_stats(cpu)->irq_spurious_count;
	181	#endif
	182	return sum;
	183	}
	184
	185	u64 arch_irq_stat(void)
	186	{
	187	u64 sum = atomic_read(&irq_err_count);
	188
189	#ifdef CONFIG_X86_IO_APIC
190	sum += atomic_read(&irq_mis_count);
191	#endif
192	return sum;
193	}
c3d80000 IM	194
c3d80000 IM	195	EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);