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author	Gennadiy Civil <gennadiycivil@users.noreply.github.com>	2018-08-14 14:24:01 -0700
committer	GitHub <noreply@github.com>	2018-08-14 14:24:01 -0700
commit	587ceaeaee6c2ccb5e565858d7fe12aaf69795e6 (patch)
tree	8ff09c590425eb6c930cad693d39641efcc7a1b0 /googlemock/scripts/generator
parent	3306848f697568aacf4bcca330f6bdd5ce671899 (diff)
parent	f0e4c411ca08f01068162483e92810001b178a60 (diff)
download	googletest-587ceaeaee6c2ccb5e565858d7fe12aaf69795e6.tar.gz googletest-587ceaeaee6c2ccb5e565858d7fe12aaf69795e6.tar.bz2 googletest-587ceaeaee6c2ccb5e565858d7fe12aaf69795e6.zip

Merge pull request #1741 from gennadiycivil/master

Comments changes, no functionality changes.

Diffstat (limited to 'googlemock/scripts/generator')

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/*
 *	linux/arch/ia64/kernel/irq.c
 *
 *	Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
 *
 * This file contains the code used by various IRQ handling routines:
 * asking for different IRQ's should be done through these routines
 * instead of just grabbing them. Thus setups with different IRQ numbers
 * shouldn't result in any weird surprises, and installing new handlers
 * should be easier.
 *
 * Copyright (C) Ashok Raj<ashok.raj@intel.com>, Intel Corporation 2004
 *
 * 4/14/2004: Added code to handle cpu migration and do safe irq
 *			migration without lossing interrupts for iosapic
 *			architecture.
 */

/*
 * (mostly architecture independent, will move to kernel/irq.c in 2.5.)
 *
 * IRQs are in fact implemented a bit like signal handlers for the kernel.
 * Naturally it's not a 1:1 relation, but there are similarities.
 */

#include <linux/config.h>
#include <linux/errno.h>
#include <linux/module.h>
#ifndef XEN
#include <linux/signal.h>
#endif
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/timex.h>
#include <linux/slab.h>
#ifndef XEN
#include <linux/random.h>
#include <linux/cpu.h>
#endif
#include <linux/ctype.h>
#ifndef XEN
#include <linux/smp_lock.h>
#endif
#include <linux/init.h>
#ifndef XEN
#include <linux/kernel_stat.h>
#endif
#include <linux/irq.h>
#ifndef XEN
#include <linux/proc_fs.h>
#endif
#include <linux/seq_file.h>
#ifndef XEN
#include <linux/kallsyms.h>
#include <linux/notifier.h>
#endif

#include <asm/atomic.h>
#ifndef XEN
#include <asm/cpu.h>
#endif
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/uaccess.h>
#include <asm/pgalloc.h>
#ifndef XEN
#include <asm/tlbflush.h>
#endif
#include <asm/delay.h>
#include <asm/irq.h>

#ifdef XEN
#include <xen/event.h>
#define _irq_desc irq_desc
#define irq_descp(irq) &irq_desc[irq]
#define apicid_to_phys_cpu_present(x)	1
#endif


/*
 * Linux has a controller-independent x86 interrupt architecture.
 * every controller has a 'controller-template', that is used
 * by the main code to do the right thing. Each driver-visible
 * interrupt source is transparently wired to the appropriate
 * controller. Thus drivers need not be aware of the
 * interrupt-controller.
 *
 * Various interrupt controllers we handle: 8259 PIC, SMP IO-APIC,
 * PIIX4's internal 8259 PIC and SGI's Visual Workstation Cobalt (IO-)APIC.
 * (IO-APICs assumed to be messaging to Pentium local-APICs)
 *
 * the code is designed to be easily extended with new/different
 * interrupt controllers, without having to do assembly magic.
 */

/*
 * Controller mappings for all interrupt sources:
 */
irq_desc_t _irq_desc[NR_IRQS] __cacheline_aligned = {
	[0 ... NR_IRQS-1] = {
		.status = IRQ_DISABLED,
		.handler = &no_irq_type,
		.lock = SPIN_LOCK_UNLOCKED
	}
};

/*
 * This is updated when the user sets irq affinity via /proc
 */
cpumask_t    __cacheline_aligned pending_irq_cpumask[NR_IRQS];

#ifdef CONFIG_IA64_GENERIC
irq_desc_t * __ia64_irq_desc (unsigned int irq)
{
	return _irq_desc + irq;
}

ia64_vector __ia64_irq_to_vector (unsigned int irq)
{
	return (ia64_vector) irq;
}

unsigned int __ia64_local_vector_to_irq (ia64_vector vec)
{
	return (unsigned int) vec;
}
#endif

static void register_irq_proc (unsigned int irq);

/*
 * Special irq handlers.
 */

#ifdef XEN
void no_action(int cpl, void *dev_id, struct pt_regs *regs) { }
#else
irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs)
{ return IRQ_NONE; }
#endif

/*
 * Generic no controller code
 */

static void enable_none(unsigned int irq) { }
static unsigned int startup_none(unsigned int irq) { return 0; }
static void disable_none(unsigned int irq) { }
static void ack_none(unsigned int irq)
{
/*
 * 'what should we do if we get a hw irq event on an illegal vector'.
 * each architecture has to answer this themselves, it doesn't deserve
 * a generic callback i think.
 */
#ifdef CONFIG_X86
	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.
	 */
	ack_APIC_irq();
#endif
#endif
#ifdef CONFIG_IA64
	printk(KERN_ERR "Unexpected irq vector 0x%x on CPU %u!\n", irq, smp_processor_id());
#endif
}

/* startup is the same as "enable", shutdown is same as "disable" */
#define shutdown_none	disable_none
#define end_none	enable_none

struct hw_interrupt_type no_irq_type = {
	"none",
	startup_none,
	shutdown_none,
	enable_none,
	disable_none,
	ack_none,
	end_none
};

atomic_t irq_err_count;
#ifdef CONFIG_X86_IO_APIC
#ifdef APIC_MISMATCH_DEBUG
atomic_t irq_mis_count;
#endif
#endif

/*
 * Generic, controller-independent functions:
 */

#ifndef XEN
int show_interrupts(struct seq_file *p, void *v)
{
	int j, i = *(loff_t *) v;
	struct irqaction * action;
	irq_desc_t *idesc;
	unsigned long flags;

	if (i == 0) {
		seq_puts(p, "           ");
		for (j=0; j<NR_CPUS; j++)
			if (cpu_online(j))
				seq_printf(p, "CPU%d       ",j);
		seq_putc(p, '\n');
	}

	if (i < NR_IRQS) {
		idesc = irq_descp(i);
		spin_lock_irqsave(&idesc->lock, flags);
		action = idesc->action;
		if (!action)
			goto skip;
		seq_printf(p, "%3d: ",i);
#ifndef CONFIG_SMP
		seq_printf(p, "%10u ", kstat_irqs(i));
#else
		for (j = 0; j < NR_CPUS; j++)
			if (cpu_online(j))
				seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif
		seq_printf(p, " %14s", idesc->handler->typename);
		seq_printf(p, "  %s", action->name);

		for (action=action->next; action; action = action->next)
			seq_printf(p, ", %s", action->name);

		seq_putc(p, '\n');
skip:
		spin_unlock_irqrestore(&idesc->lock, flags);
	} else if (i == NR_IRQS) {
		seq_puts(p, "NMI: ");
		for (j = 0; j < NR_CPUS; j++)
			if (cpu_online(j))
				seq_printf(p, "%10u ", nmi_count(j));
		seq_putc(p, '\n');
#ifdef CONFIG_X86_LOCAL_APIC
		seq_puts(p, "LOC: ");
		for (j = 0; j < NR_CPUS; j++)
			if (cpu_online(j))
				seq_printf(p, "%10u ", irq_stat[j].apic_timer_irqs);
		seq_putc(p, '\n');
#endif
		seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
#ifdef CONFIG_X86_IO_APIC
#ifdef APIC_MISMATCH_DEBUG
		seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
#endif
#endif
	}
	return 0;
}
#endif

#ifdef CONFIG_SMP
inline void synchronize_irq(unsigned int irq)
{
#ifndef XEN
	struct irq_desc *desc = irq_desc + irq;

	while (desc->status & IRQ_INPROGRESS)
		cpu_relax();
#endif
}
EXPORT_SYMBOL(synchronize_irq);
#endif

/*
 * This should really return information about whether
 * we should do bottom half handling etc. Right now we
 * end up _always_ checking the bottom half, which is a
 * waste of time and is not what some drivers would
 * prefer.
 */
int handle_IRQ_event(unsigned int irq,
		struct pt_regs *regs, struct irqaction *action)
{
	int status = 1;	/* Force the "do bottom halves" bit */
	int retval = 0;

#ifndef XEN
	if (!(action->flags & SA_INTERRUPT))
#endif
		local_irq_enable();

#ifdef XEN
		action->handler(irq, action->dev_id, regs);
#else
	do {
		status |= action->flags;
		retval |= action->handler(irq, action->dev_id, regs);
		action = action->next;
	} while (action);
	if (status & SA_SAMPLE_RANDOM)
		add_interrupt_randomness(irq);
#endif
	local_irq_disable();
	return retval;
}

#ifndef XEN
static void __report_bad_irq(int irq, irq_desc_t *desc, irqreturn_t action_ret)
{
	struct irqaction *action;

	if (action_ret != IRQ_HANDLED && action_ret != IRQ_NONE) {
		printk(KERN_ERR "irq event %d: bogus return value %x\n",
				irq, action_ret);
	} else {
		printk(KERN_ERR "irq %d: nobody cared!\n", irq);
	}
	dump_stack();
	printk(KERN_ERR "handlers:\n");
	action = desc->action;
	do {
		printk(KERN_ERR "[<%p>]", action->handler);
		print_symbol(" (%s)",
			(unsigned long)action->handler);
		printk("\n");
		action = action->next;
	} while (action);
}

static void report_bad_irq(int irq, irq_desc_t *desc, irqreturn_t action_ret)
{
	static int count = 100;

	if (count) {
		count--;
		__report_bad_irq(irq, desc, action_ret);
	}
}
#endif

static int noirqdebug;

static int __init noirqdebug_setup(char *str)
{
	noirqdebug = 1;
	printk("IRQ lockup detection disabled\n");
	return 1;
}

__setup("noirqdebug", noirqdebug_setup);

/*
 * If 99,900 of the previous 100,000 interrupts have not been handled then
 * assume that the IRQ is stuck in some manner.  Drop a diagnostic and try to
 * turn the IRQ off.
 *
 * (The other 100-of-100,000 interrupts may have been a correctly-functioning
 *  device sharing an IRQ with the failing one)
 *
 * Called under desc->lock
 */
#ifndef XEN
static void note_interrupt(int irq, irq_desc_t *desc, irqreturn_t action_ret)
{
	if (action_ret != IRQ_HANDLED) {
		desc->irqs_unhandled++;
		if (action_ret != IRQ_NONE)
			report_bad_irq(irq, desc, action_ret);
	}

	desc->irq_count++;
	if (desc->irq_count < 100000)
		return;

	desc->irq_count = 0;
	if (desc->irqs_unhandled > 99900) {
		/*
		 * The interrupt is stuck
		 */
		__report_bad_irq(irq, desc, action_ret);
		/*
		 * Now kill the IRQ
		 */
		printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
		desc->status |= IRQ_DISABLED;
		desc->handler->disable(irq);
	}
	desc->irqs_unhandled = 0;
}
#endif

/*
 * Generic enable/disable code: this just calls
 * down into the PIC-specific version for the actual
 * hardware disable after having gotten the irq
 * controller lock.
 */

/**
 *	disable_irq_nosync - disable an irq without waiting
 *	@irq: Interrupt to disable
 *
 *	Disable the selected interrupt line.  Disables and Enables are
 *	nested.
 *	Unlike disable_irq(), this function does not ensure existing
 *	instances of the IRQ handler have completed before returning.
 *
 *	This function may be called from IRQ context.
 */

inline void disable_irq_nosync(unsigned int irq)
{
	irq_desc_t *desc = irq_descp(irq);
	unsigned long flags;

	spin_lock_irqsave(&desc->lock, flags);
	if (!desc->depth++) {
		desc->status |= IRQ_DISABLED;
		desc->handler->disable(irq);
	}
	spin_unlock_irqrestore(&desc->lock, flags);
}
EXPORT_SYMBOL(disable_irq_nosync);

/**
 *	disable_irq - disable an irq and wait for completion
 *	@irq: Interrupt to disable
 *
 *	Disable the selected interrupt line.  Enables and Disables are
 *	nested.
 *	This function waits for any pending IRQ handlers for this interrupt
 *	to complete before returning. If you use this function while
 *	holding a resource the IRQ handler may need you will deadlock.
 *
 *	This function may be called - with care - from IRQ context.
 */

void disable_irq(unsigned int irq)
{
	irq_desc_t *desc = irq_descp(irq);

	disable_irq_nosync(irq);
	if (desc->action)
		synchronize_irq(irq);
}
EXPORT_SYMBOL(disable_irq);

/**
 *	enable_irq - enable handling of an irq
 *	@irq: Interrupt to enable
 *
 *	Undoes the effect of one call to disable_irq().  If this
 *	matches the last disable, processing of interrupts on this
 *	IRQ line is re-enabled.
 *
 *	This function may be called from IRQ context.
 */

void enable_irq(unsigned int irq)
{
	irq_desc_t *desc = irq_descp(irq);
	unsigned long flags;

	spin_lock_irqsave(&desc->lock, flags);
	switch (desc->depth) {
	case 1: {
		unsigned int status = desc->status & ~IRQ_DISABLED;
		desc->status = status;
#ifndef XEN
		if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
			desc->status = status | IRQ_REPLAY;
			hw_resend_irq(desc->handler,irq);
		}
#endif
		desc->handler->enable(irq);
		/* fall-through */
	}
	default:
		desc->depth--;
		break;
	case 0:
		printk(KERN_ERR "enable_irq(%u) unbalanced from %p\n",
		       irq, (void *) __builtin_return_address(0));
	}
	spin_unlock_irqrestore(&desc->lock, flags);
}
EXPORT_SYMBOL(enable_irq);

/*
 * do_IRQ handles all normal device IRQ's (the special
 * SMP cross-CPU interrupts have their own specific
 * handlers).
 */
fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs)
{
	irq_desc_t *desc = irq_desc + irq;
	struct irqaction * action;
	unsigned int status;

#ifndef XEN
	kstat_this_cpu.irqs[irq]++;
#endif
	if (desc->status & IRQ_PER_CPU) {
		irqreturn_t action_ret;

		/*
		 * No locking required for CPU-local interrupts:
		 */
		desc->handler->ack(irq);
		action_ret = handle_IRQ_event(irq, regs, desc->action);
#ifndef XEN
		if (!noirqdebug)
			note_interrupt(irq, desc, action_ret);
#endif
		desc->handler->end(irq);
		return 1;
	}

	spin_lock(&desc->lock);
	desc->handler->ack(irq);
	/*
	 * REPLAY is when Linux resends an IRQ that was dropped earlier
	 * WAITING is used by probe to mark irqs that are being tested


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