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Commit cd85d551 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: more irq statistics in /proc/interrupts 



Add framework and initial values for more fine grained statistics in
/proc/interrupts.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 200c8804

arch/parisc/include/asm/hardirq.h

+35 −1
Original line number Diff line number Diff line 
/* hardirq.h: PA-RISC hard IRQ support.

 *

 * Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx>

 * Copyright (C) 2013 Helge Deller <deller@gmx.de>

 */



#ifndef _PARISC_HARDIRQ_H

#define _PARISC_HARDIRQ_H



#include <asm-generic/hardirq.h>

#include <linux/cache.h>

#include <linux/threads.h>

#include <linux/irq.h>



typedef struct {

	unsigned int __softirq_pending;

#ifdef CONFIG_DEBUG_STACKOVERFLOW

	unsigned int kernel_stack_usage;

#endif

#ifdef CONFIG_SMP

	unsigned int irq_resched_count;

	unsigned int irq_call_count;

	/*

	 * irq_tlb_count is double-counted in irq_call_count, so it must be

	 * subtracted from irq_call_count when displaying irq_call_count

	 */

	unsigned int irq_tlb_count;

#endif

} ____cacheline_aligned irq_cpustat_t;



DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);



#define __ARCH_IRQ_STAT

#define __IRQ_STAT(cpu, member) (irq_stat[cpu].member)

#define inc_irq_stat(member)	this_cpu_inc(irq_stat.member)

#define local_softirq_pending()	this_cpu_read(irq_stat.__softirq_pending)



#define __ARCH_SET_SOFTIRQ_PENDING



#define set_softirq_pending(x)	\

		this_cpu_write(irq_stat.__softirq_pending, (x))

#define or_softirq_pending(x)	this_cpu_or(irq_stat.__softirq_pending, (x))



#define ack_bad_irq(irq) WARN(1, "unexpected IRQ trap at vector %02x\n", irq)



#endif /* _PARISC_HARDIRQ_H */

arch/parisc/include/asm/processor.h

+0 −1
Original line number Diff line number Diff line
@@ -112,7 +112,6 @@ struct cpuinfo_parisc { 
	unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */

#ifdef CONFIG_SMP

	unsigned long pending_ipi;  /* bitmap of type ipi_message_type */

	unsigned long ipi_count;    /* number ipi Interrupts */

#endif

	unsigned long bh_count;     /* number of times bh was invoked */

	unsigned long prof_counter; /* per CPU profiling support */

arch/parisc/kernel/irq.c

+47 −1
Original line number Diff line number Diff line
@@ -152,6 +152,40 @@ static struct irq_chip cpu_interrupt_type = { 
	.irq_retrigger	= NULL,

};



DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);

#define irq_stats(x)		(&per_cpu(irq_stat, x))



/*

 * /proc/interrupts printing for arch specific interrupts

 */

int arch_show_interrupts(struct seq_file *p, int prec)

{

	int j;



#ifdef CONFIG_DEBUG_STACKOVERFLOW

	seq_printf(p, "%*s: ", prec, "STK");

	for_each_online_cpu(j)

		seq_printf(p, "%10u ", irq_stats(j)->kernel_stack_usage);

	seq_printf(p, "  Kernel stack usage\n");

#endif

#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 -

					irq_stats(j)->irq_tlb_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

	return 0;

}



int show_interrupts(struct seq_file *p, void *v)

{

	int i = *(loff_t *) v, j;
@@ -219,6 +253,9 @@ int show_interrupts(struct seq_file *p, void *v) 
		raw_spin_unlock_irqrestore(&desc->lock, flags);

	}



	if (i == NR_IRQS)

		arch_show_interrupts(p, 3);



	return 0;

}
@@ -340,13 +377,22 @@ static inline void stack_overflow_check(struct pt_regs *regs) 
	/* Our stack starts directly behind the thread_info struct. */

	unsigned long stack_start = (unsigned long) current_thread_info();

	unsigned long sp = regs->gr[30];

	unsigned long stack_usage;

	unsigned int *last_usage;



	/* if sr7 != 0, we interrupted a userspace process which we do not want

	 * to check for stack overflow. We will only check the kernel stack. */

	if (regs->sr[7])

		return;



	if (likely((sp - stack_start) < (THREAD_SIZE - STACK_MARGIN)))

	/* calculate kernel stack usage */

	stack_usage = sp - stack_start;

	last_usage = &per_cpu(irq_stat.kernel_stack_usage, smp_processor_id());



	if (unlikely(stack_usage > *last_usage))

		*last_usage = stack_usage;



	if (likely(stack_usage < (THREAD_SIZE - STACK_MARGIN)))

		return;



	pr_emerg("stackcheck: %s will most likely overflow kernel stack "

arch/parisc/kernel/smp.c

+2 −1
Original line number Diff line number Diff line
@@ -127,7 +127,7 @@ ipi_interrupt(int irq, void *dev_id) 
	unsigned long flags;



	/* Count this now; we may make a call that never returns. */

	p->ipi_count++;

	inc_irq_stat(irq_call_count);



	mb();	/* Order interrupt and bit testing. */
@@ -155,6 +155,7 @@ ipi_interrupt(int irq, void *dev_id) 
				

			case IPI_RESCHEDULE:

				smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu);

				inc_irq_stat(irq_resched_count);

				scheduler_ipi();

				break;

arch/parisc/mm/init.c

+2 −0
Original line number Diff line number Diff line
@@ -1069,6 +1069,7 @@ void flush_tlb_all(void) 
{

	int do_recycle;



	inc_irq_stat(irq_tlb_count);

	do_recycle = 0;

	spin_lock(&sid_lock);

	if (dirty_space_ids > RECYCLE_THRESHOLD) {
@@ -1089,6 +1090,7 @@ void flush_tlb_all(void) 
#else

void flush_tlb_all(void)

{

	inc_irq_stat(irq_tlb_count);

	spin_lock(&sid_lock);

	flush_tlb_all_local(NULL);

	recycle_sids();