[deliverable/linux.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/of.h>
#include <linux/seq_file.h>
#include <linux/smp.h>
#include <linux/ftrace.h>

#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/irq.h>
#include <asm/idle.h>
#include <asm/mce.h>
#include <asm/hw_irq.h>

atomic_t irq_err_count;

/* Function pointer for generic interrupt vector handling */
void (*x86_platform_ipi_callback)(void) = NULL;

/*
 * '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)
{
	if (printk_ratelimit())
		pr_err("unexpected IRQ trap at vector %02x\n", irq);

	/*
	 * 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
	 */
	ack_APIC_irq();
}

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

	seq_printf(p, "%*s: ", prec, "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, "%*s: ", prec, "LOC");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
	seq_printf(p, "  Local timer interrupts\n");

	seq_printf(p, "%*s: ", prec, "SPU");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
	seq_printf(p, "  Spurious interrupts\n");
	seq_printf(p, "%*s: ", prec, "PMI");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->apic_perf_irqs);
	seq_printf(p, "  Performance monitoring interrupts\n");
	seq_printf(p, "%*s: ", prec, "IWI");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->apic_irq_work_irqs);
	seq_printf(p, "  IRQ work interrupts\n");
#endif
	if (x86_platform_ipi_callback) {
		seq_printf(p, "%*s: ", prec, "PLT");
		for_each_online_cpu(j)
			seq_printf(p, "%10u ", irq_stats(j)->x86_platform_ipis);
		seq_printf(p, "  Platform interrupts\n");
	}
#ifdef CONFIG_SMP
	seq_printf(p, "%*s: ", prec, "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, "%*s: ", prec, "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, "%*s: ", prec, "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_THERMAL_VECTOR
	seq_printf(p, "%*s: ", prec, "TRM");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
	seq_printf(p, "  Thermal event interrupts\n");
#endif
#ifdef CONFIG_X86_MCE_THRESHOLD
	seq_printf(p, "%*s: ", prec, "THR");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
	seq_printf(p, "  Threshold APIC interrupts\n");
#endif
#ifdef CONFIG_X86_MCE
	seq_printf(p, "%*s: ", prec, "MCE");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", per_cpu(mce_exception_count, j));
	seq_printf(p, "  Machine check exceptions\n");
	seq_printf(p, "%*s: ", prec, "MCP");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", per_cpu(mce_poll_count, j));
	seq_printf(p, "  Machine check polls\n");
#endif
	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
#if defined(CONFIG_X86_IO_APIC)
	seq_printf(p, "%*s: %10u\n", prec, "MIS", 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, prec;
	struct irqaction *action;
	struct irq_desc *desc;

	if (i > nr_irqs)
		return 0;

	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
		j *= 10;

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

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

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

	raw_spin_lock_irqsave(&desc->lock, flags);
	for_each_online_cpu(j)
		any_count |= kstat_irqs_cpu(i, j);
	action = desc->action;
	if (!action && !any_count)
		goto out;

	seq_printf(p, "%*d: ", prec, i);
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
	seq_printf(p, " %8s", desc->irq_data.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:
	raw_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;
	sum += irq_stats(cpu)->irq_spurious_count;
	sum += irq_stats(cpu)->apic_perf_irqs;
	sum += irq_stats(cpu)->apic_irq_work_irqs;
#endif
	if (x86_platform_ipi_callback)
		sum += irq_stats(cpu)->x86_platform_ipis;
#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_THERMAL_VECTOR
	sum += irq_stats(cpu)->irq_thermal_count;
#endif
#ifdef CONFIG_X86_MCE_THRESHOLD
	sum += irq_stats(cpu)->irq_threshold_count;
#endif
#ifdef CONFIG_X86_MCE
	sum += per_cpu(mce_exception_count, cpu);
	sum += per_cpu(mce_poll_count, cpu);
#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;
}


/*
 * do_IRQ handles all normal device IRQ's (the special
 * SMP cross-CPU interrupts have their own specific
 * handlers).
 */
unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
{
	struct pt_regs *old_regs = set_irq_regs(regs);

	/* high bit used in ret_from_ code  */
	unsigned vector = ~regs->orig_ax;
	unsigned irq;

	exit_idle();
	irq_enter();

	irq = __this_cpu_read(vector_irq[vector]);

	if (!handle_irq(irq, regs)) {
		ack_APIC_irq();

		if (printk_ratelimit())
			pr_emerg("%s: %d.%d No irq handler for vector (irq %d)\n",
				__func__, smp_processor_id(), vector, irq);
	}

	irq_exit();

	set_irq_regs(old_regs);
	return 1;
}

/*
 * Handler for X86_PLATFORM_IPI_VECTOR.
 */
void smp_x86_platform_ipi(struct pt_regs *regs)
{
	struct pt_regs *old_regs = set_irq_regs(regs);

	ack_APIC_irq();

	exit_idle();

	irq_enter();

	inc_irq_stat(x86_platform_ipis);

	if (x86_platform_ipi_callback)
		x86_platform_ipi_callback();

	irq_exit();

	set_irq_regs(old_regs);
}

EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);

#ifdef CONFIG_OF
unsigned int irq_create_of_mapping(struct device_node *controller,
		const u32 *intspec, unsigned int intsize)
{
	return intspec[0];
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
#endif

#ifdef CONFIG_HOTPLUG_CPU
/* A cpu has been removed from cpu_online_mask.  Reset irq affinities. */
void fixup_irqs(void)
{
	unsigned int irq, vector;
	static int warned;
	struct irq_desc *desc;
	struct irq_data *data;

	for_each_irq_desc(irq, desc) {
		int break_affinity = 0;
		int set_affinity = 1;
		const struct cpumask *affinity;

		if (!desc)
			continue;
		if (irq == 2)
			continue;

		/* interrupt's are disabled at this point */
		raw_spin_lock(&desc->lock);

		data = &desc->irq_data;
		affinity = data->affinity;
		if (!irq_has_action(irq) ||
		    cpumask_subset(affinity, cpu_online_mask)) {
			raw_spin_unlock(&desc->lock);
			continue;
		}

		/*
		 * Complete the irq move. This cpu is going down and for
		 * non intr-remapping case, we can't wait till this interrupt
		 * arrives at this cpu before completing the irq move.
		 */
		irq_force_complete_move(irq);

		if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
			break_affinity = 1;
			affinity = cpu_all_mask;
		}

		if (!(desc->status & IRQ_MOVE_PCNTXT) && data->chip->irq_mask)
			data->chip->irq_mask(data);

		if (data->chip->irq_set_affinity)
			data->chip->irq_set_affinity(data, affinity, true);
		else if (!(warned++))
			set_affinity = 0;

		if (!(desc->status & IRQ_MOVE_PCNTXT) && data->chip->irq_unmask)
			data->chip->irq_unmask(data);

		raw_spin_unlock(&desc->lock);

		if (break_affinity && set_affinity)
			printk("Broke affinity for irq %i\n", irq);
		else if (!set_affinity)
			printk("Cannot set affinity for irq %i\n", irq);
	}

	/*
	 * We can remove mdelay() and then send spuriuous interrupts to
	 * new cpu targets for all the irqs that were handled previously by
	 * this cpu. While it works, I have seen spurious interrupt messages
	 * (nothing wrong but still...).
	 *
	 * So for now, retain mdelay(1) and check the IRR and then send those
	 * interrupts to new targets as this cpu is already offlined...
	 */
	mdelay(1);

	for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
		unsigned int irr;

		if (__this_cpu_read(vector_irq[vector]) < 0)
			continue;

		irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
		if (irr  & (1 << (vector % 32))) {
			irq = __this_cpu_read(vector_irq[vector]);

			desc = irq_to_desc(irq);
			data = &desc->irq_data;
			raw_spin_lock(&desc->lock);
			if (data->chip->irq_retrigger)
				data->chip->irq_retrigger(data);
			raw_spin_unlock(&desc->lock);
		}
	}
}
#endif
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>
6b39ba77	11
7b6aa335	12	#include <asm/apic.h>
6b39ba77	13	#include <asm/io_apic.h>
c3d80000	14	#include <asm/irq.h>
7c1d7cdc	15	#include <asm/idle.h>
01ca79f1	16	#include <asm/mce.h>
2c1b284e	17	#include <asm/hw_irq.h>
6b39ba77 TG	18
	19	atomic_t irq_err_count;
	20
acaabe79	21	/* Function pointer for generic interrupt vector handling */
4a4de9c7	22	void (*x86_platform_ipi_callback)(void) = NULL;
acaabe79	23
249f6d9e TG	24	/*
	25	* 'what should we do if we get a hw irq event on an illegal vector'.
	26	* each architecture has to answer this themselves.
	27	*/
	28	void ack_bad_irq(unsigned int irq)
	29	{
edea7148 CG	30	if (printk_ratelimit())
edea7148 CG	31	pr_err("unexpected IRQ trap at vector %02x\n", irq);
249f6d9e	32
249f6d9e TG	33	/*
	34	* Currently unexpected vectors happen only on SMP and APIC.
	35	* We _must_ ack these because every local APIC has only N
	36	* irq slots per priority level, and a 'hanging, unacked' IRQ
	37	* holds up an irq slot - in excessive cases (when multiple
	38	* unexpected vectors occur) that might lock up the APIC
	39	* completely.
	40	* But only ack when the APIC is enabled -AK
	41	*/
08306ce6	42	ack_APIC_irq();
249f6d9e TG	43	}
249f6d9e TG	44
1b437c8c	45	#define irq_stats(x) (&per_cpu(irq_stat, x))
6b39ba77 TG	46	/*
	47	* /proc/interrupts printing:
	48	*/
7a81d9a7	49	static int show_other_interrupts(struct seq_file *p, int prec)
6b39ba77 TG	50	{
	51	int j;
	52
7a81d9a7	53	seq_printf(p, "%*s: ", prec, "NMI");
6b39ba77 TG	54	for_each_online_cpu(j)
	55	seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
	56	seq_printf(p, " Non-maskable interrupts\n");
	57	#ifdef CONFIG_X86_LOCAL_APIC
7a81d9a7	58	seq_printf(p, "%*s: ", prec, "LOC");
6b39ba77 TG	59	for_each_online_cpu(j)
	60	seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
	61	seq_printf(p, " Local timer interrupts\n");
474e56b8 JSR	62
	63	seq_printf(p, "%*s: ", prec, "SPU");
	64	for_each_online_cpu(j)
	65	seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
	66	seq_printf(p, " Spurious interrupts\n");
89ccf465	67	seq_printf(p, "%*s: ", prec, "PMI");
241771ef IM	68	for_each_online_cpu(j)
241771ef IM	69	seq_printf(p, "%10u ", irq_stats(j)->apic_perf_irqs);
89ccf465	70	seq_printf(p, " Performance monitoring interrupts\n");
e360adbe	71	seq_printf(p, "%*s: ", prec, "IWI");
b6276f35	72	for_each_online_cpu(j)
e360adbe PZ	73	seq_printf(p, "%10u ", irq_stats(j)->apic_irq_work_irqs);
e360adbe PZ	74	seq_printf(p, " IRQ work interrupts\n");
6b39ba77	75	#endif
4a4de9c7	76	if (x86_platform_ipi_callback) {
59d13812	77	seq_printf(p, "%*s: ", prec, "PLT");
acaabe79	78	for_each_online_cpu(j)
4a4de9c7	79	seq_printf(p, "%10u ", irq_stats(j)->x86_platform_ipis);
acaabe79 DS	80	seq_printf(p, " Platform interrupts\n");
acaabe79 DS	81	}
6b39ba77	82	#ifdef CONFIG_SMP
7a81d9a7	83	seq_printf(p, "%*s: ", prec, "RES");
6b39ba77 TG	84	for_each_online_cpu(j)
	85	seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
	86	seq_printf(p, " Rescheduling interrupts\n");
7a81d9a7	87	seq_printf(p, "%*s: ", prec, "CAL");
6b39ba77 TG	88	for_each_online_cpu(j)
	89	seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
	90	seq_printf(p, " Function call interrupts\n");
7a81d9a7	91	seq_printf(p, "%*s: ", prec, "TLB");
6b39ba77 TG	92	for_each_online_cpu(j)
	93	seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
	94	seq_printf(p, " TLB shootdowns\n");
	95	#endif
0444c9bd	96	#ifdef CONFIG_X86_THERMAL_VECTOR
7a81d9a7	97	seq_printf(p, "%*s: ", prec, "TRM");
6b39ba77 TG	98	for_each_online_cpu(j)
	99	seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
	100	seq_printf(p, " Thermal event interrupts\n");
0444c9bd JB	101	#endif
0444c9bd JB	102	#ifdef CONFIG_X86_MCE_THRESHOLD
7a81d9a7	103	seq_printf(p, "%*s: ", prec, "THR");
6b39ba77 TG	104	for_each_online_cpu(j)
	105	seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
	106	seq_printf(p, " Threshold APIC interrupts\n");
01ca79f1	107	#endif
c1ebf835	108	#ifdef CONFIG_X86_MCE
01ca79f1 AK	109	seq_printf(p, "%*s: ", prec, "MCE");
	110	for_each_online_cpu(j)
	111	seq_printf(p, "%10u ", per_cpu(mce_exception_count, j));
	112	seq_printf(p, " Machine check exceptions\n");
ca84f696 AK	113	seq_printf(p, "%*s: ", prec, "MCP");
	114	for_each_online_cpu(j)
	115	seq_printf(p, "%10u ", per_cpu(mce_poll_count, j));
	116	seq_printf(p, " Machine check polls\n");
6b39ba77	117	#endif
7a81d9a7	118	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
6b39ba77	119	#if defined(CONFIG_X86_IO_APIC)
7a81d9a7	120	seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count));
6b39ba77 TG	121	#endif
	122	return 0;
	123	}
	124
	125	int show_interrupts(struct seq_file p, void v)
	126	{
	127	unsigned long flags, any_count = 0;
7a81d9a7	128	int i = (loff_t ) v, j, prec;
6b39ba77 TG	129	struct irqaction *action;
	130	struct irq_desc *desc;
	131
	132	if (i > nr_irqs)
	133	return 0;
	134
7a81d9a7 JB	135	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
	136	j *= 10;
	137
6b39ba77	138	if (i == nr_irqs)
7a81d9a7	139	return show_other_interrupts(p, prec);
6b39ba77 TG	140
	141	/* print header */
	142	if (i == 0) {
7a81d9a7	143	seq_printf(p, "%*s", prec + 8, "");
6b39ba77	144	for_each_online_cpu(j)
e9f95e63	145	seq_printf(p, "CPU%-8d", j);
6b39ba77 TG	146	seq_putc(p, '\n');
	147	}
	148
	149	desc = irq_to_desc(i);
0b8f1efa YL	150	if (!desc)
	151	return 0;
	152
239007b8	153	raw_spin_lock_irqsave(&desc->lock, flags);
6b39ba77 TG	154	for_each_online_cpu(j)
6b39ba77 TG	155	any_count \|= kstat_irqs_cpu(i, j);
6b39ba77 TG	156	action = desc->action;
	157	if (!action && !any_count)
	158	goto out;
	159
7a81d9a7	160	seq_printf(p, "%*d: ", prec, i);
6b39ba77 TG	161	for_each_online_cpu(j)
6b39ba77 TG	162	seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
a3c08e5d	163	seq_printf(p, " %8s", desc->irq_data.chip->name);
6b39ba77 TG	164	seq_printf(p, "-%-8s", desc->name);
	165
	166	if (action) {
	167	seq_printf(p, " %s", action->name);
	168	while ((action = action->next) != NULL)
	169	seq_printf(p, ", %s", action->name);
	170	}
	171
	172	seq_putc(p, '\n');
	173	out:
239007b8	174	raw_spin_unlock_irqrestore(&desc->lock, flags);
6b39ba77 TG	175	return 0;
	176	}
	177
	178	/*
	179	* /proc/stat helpers
	180	*/
	181	u64 arch_irq_stat_cpu(unsigned int cpu)
	182	{
	183	u64 sum = irq_stats(cpu)->__nmi_count;
	184
	185	#ifdef CONFIG_X86_LOCAL_APIC
	186	sum += irq_stats(cpu)->apic_timer_irqs;
474e56b8	187	sum += irq_stats(cpu)->irq_spurious_count;
241771ef	188	sum += irq_stats(cpu)->apic_perf_irqs;
e360adbe	189	sum += irq_stats(cpu)->apic_irq_work_irqs;
6b39ba77	190	#endif
4a4de9c7 DS	191	if (x86_platform_ipi_callback)
4a4de9c7 DS	192	sum += irq_stats(cpu)->x86_platform_ipis;
6b39ba77 TG	193	#ifdef CONFIG_SMP
	194	sum += irq_stats(cpu)->irq_resched_count;
	195	sum += irq_stats(cpu)->irq_call_count;
	196	sum += irq_stats(cpu)->irq_tlb_count;
	197	#endif
0444c9bd	198	#ifdef CONFIG_X86_THERMAL_VECTOR
6b39ba77	199	sum += irq_stats(cpu)->irq_thermal_count;
0444c9bd JB	200	#endif
0444c9bd JB	201	#ifdef CONFIG_X86_MCE_THRESHOLD
6b39ba77	202	sum += irq_stats(cpu)->irq_threshold_count;
8051dbd2	203	#endif
c1ebf835	204	#ifdef CONFIG_X86_MCE
8051dbd2 HS	205	sum += per_cpu(mce_exception_count, cpu);
8051dbd2 HS	206	sum += per_cpu(mce_poll_count, cpu);
6b39ba77 TG	207	#endif
	208	return sum;
	209	}
	210
	211	u64 arch_irq_stat(void)
	212	{
	213	u64 sum = atomic_read(&irq_err_count);
	214
	215	#ifdef CONFIG_X86_IO_APIC
	216	sum += atomic_read(&irq_mis_count);
	217	#endif
	218	return sum;
	219	}
c3d80000	220
7c1d7cdc JF	221
	222	/*
	223	* do_IRQ handles all normal device IRQ's (the special
	224	* SMP cross-CPU interrupts have their own specific
	225	* handlers).
	226	*/
	227	unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
	228	{
	229	struct pt_regs *old_regs = set_irq_regs(regs);
	230
	231	/* high bit used in ret_from_ code */
	232	unsigned vector = ~regs->orig_ax;
	233	unsigned irq;
	234
	235	exit_idle();
	236	irq_enter();
	237
0a3aee0d	238	irq = __this_cpu_read(vector_irq[vector]);
7c1d7cdc JF	239
7c1d7cdc JF	240	if (!handle_irq(irq, regs)) {
08306ce6	241	ack_APIC_irq();
7c1d7cdc JF	242
7c1d7cdc JF	243	if (printk_ratelimit())
edea7148 CG	244	pr_emerg("%s: %d.%d No irq handler for vector (irq %d)\n",
edea7148 CG	245	__func__, smp_processor_id(), vector, irq);
7c1d7cdc JF	246	}
	247
	248	irq_exit();
	249
	250	set_irq_regs(old_regs);
	251	return 1;
	252	}
	253
acaabe79	254	/*
4a4de9c7	255	* Handler for X86_PLATFORM_IPI_VECTOR.
acaabe79	256	*/
4a4de9c7	257	void smp_x86_platform_ipi(struct pt_regs *regs)
acaabe79 DS	258	{
	259	struct pt_regs *old_regs = set_irq_regs(regs);
	260
	261	ack_APIC_irq();
	262
	263	exit_idle();
	264
	265	irq_enter();
	266
4a4de9c7	267	inc_irq_stat(x86_platform_ipis);
acaabe79	268
4a4de9c7 DS	269	if (x86_platform_ipi_callback)
4a4de9c7 DS	270	x86_platform_ipi_callback();
acaabe79 DS	271
	272	irq_exit();
	273
	274	set_irq_regs(old_regs);
	275	}
	276
c3d80000	277	EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);
7a7732bc	278
4722d194 AS	279	#ifdef CONFIG_OF
	280	unsigned int irq_create_of_mapping(struct device_node *controller,
	281	const u32 *intspec, unsigned int intsize)
	282	{
	283	return intspec[0];
	284	}
	285	EXPORT_SYMBOL_GPL(irq_create_of_mapping);
	286	#endif
	287
7a7732bc SS	288	#ifdef CONFIG_HOTPLUG_CPU
	289	/* A cpu has been removed from cpu_online_mask. Reset irq affinities. */
	290	void fixup_irqs(void)
	291	{
5231a686	292	unsigned int irq, vector;
7a7732bc SS	293	static int warned;
7a7732bc SS	294	struct irq_desc *desc;
a3c08e5d	295	struct irq_data *data;
7a7732bc SS	296
	297	for_each_irq_desc(irq, desc) {
	298	int break_affinity = 0;
	299	int set_affinity = 1;
	300	const struct cpumask *affinity;
	301
	302	if (!desc)
	303	continue;
	304	if (irq == 2)
	305	continue;
	306
	307	/* interrupt's are disabled at this point */
239007b8	308	raw_spin_lock(&desc->lock);
7a7732bc	309
a3c08e5d TG	310	data = &desc->irq_data;
a3c08e5d TG	311	affinity = data->affinity;
7a7732bc	312	if (!irq_has_action(irq) \|\|
58bff947	313	cpumask_subset(affinity, cpu_online_mask)) {
239007b8	314	raw_spin_unlock(&desc->lock);
7a7732bc SS	315	continue;
	316	}
	317
a5e74b84 SS	318	/*
	319	* Complete the irq move. This cpu is going down and for
	320	* non intr-remapping case, we can't wait till this interrupt
	321	* arrives at this cpu before completing the irq move.
	322	*/
	323	irq_force_complete_move(irq);
	324
7a7732bc SS	325	if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
	326	break_affinity = 1;
	327	affinity = cpu_all_mask;
	328	}
	329
a3c08e5d TG	330	if (!(desc->status & IRQ_MOVE_PCNTXT) && data->chip->irq_mask)
a3c08e5d TG	331	data->chip->irq_mask(data);
7a7732bc	332
a3c08e5d TG	333	if (data->chip->irq_set_affinity)
a3c08e5d TG	334	data->chip->irq_set_affinity(data, affinity, true);
7a7732bc SS	335	else if (!(warned++))
	336	set_affinity = 0;
	337
a3c08e5d TG	338	if (!(desc->status & IRQ_MOVE_PCNTXT) && data->chip->irq_unmask)
a3c08e5d TG	339	data->chip->irq_unmask(data);
7a7732bc	340
239007b8	341	raw_spin_unlock(&desc->lock);
7a7732bc SS	342
	343	if (break_affinity && set_affinity)
	344	printk("Broke affinity for irq %i\n", irq);
	345	else if (!set_affinity)
	346	printk("Cannot set affinity for irq %i\n", irq);
	347	}
	348
5231a686 SS	349	/*
	350	* We can remove mdelay() and then send spuriuous interrupts to
	351	* new cpu targets for all the irqs that were handled previously by
	352	* this cpu. While it works, I have seen spurious interrupt messages
	353	* (nothing wrong but still...).
	354	*
	355	* So for now, retain mdelay(1) and check the IRR and then send those
	356	* interrupts to new targets as this cpu is already offlined...
	357	*/
7a7732bc	358	mdelay(1);
5231a686 SS	359
	360	for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
	361	unsigned int irr;
	362
0a3aee0d	363	if (__this_cpu_read(vector_irq[vector]) < 0)
5231a686 SS	364	continue;
	365
	366	irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
	367	if (irr & (1 << (vector % 32))) {
0a3aee0d	368	irq = __this_cpu_read(vector_irq[vector]);
5231a686	369
5117348d TG	370	desc = irq_to_desc(irq);
5117348d TG	371	data = &desc->irq_data;
239007b8	372	raw_spin_lock(&desc->lock);
a3c08e5d TG	373	if (data->chip->irq_retrigger)
a3c08e5d TG	374	data->chip->irq_retrigger(data);
239007b8	375	raw_spin_unlock(&desc->lock);
5231a686 SS	376	}
5231a686 SS	377	}
7a7732bc SS	378	}
7a7732bc SS	379	#endif