diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/include/asm/hardirq.h | 36 | ||||
| -rw-r--r-- | arch/parisc/include/asm/processor.h | 1 | ||||
| -rw-r--r-- | arch/parisc/kernel/irq.c | 48 | ||||
| -rw-r--r-- | arch/parisc/kernel/smp.c | 3 | ||||
| -rw-r--r-- | arch/parisc/mm/init.c | 2 |
5 files changed, 86 insertions, 4 deletions
diff --git a/arch/parisc/include/asm/hardirq.h b/arch/parisc/include/asm/hardirq.h index 0d68184..a9c0fb1 100644 --- a/arch/parisc/include/asm/hardirq.h +++ b/arch/parisc/include/asm/hardirq.h @@ -1,11 +1,45 @@ /* 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 */ diff --git a/arch/parisc/include/asm/processor.h b/arch/parisc/include/asm/processor.h index 242f06a..0640155 100644 --- a/arch/parisc/include/asm/processor.h +++ b/arch/parisc/include/asm/processor.h @@ -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 */ diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c index 810f9cf8..a237e32 100644 --- a/arch/parisc/kernel/irq.c +++ b/arch/parisc/kernel/irq.c @@ -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 " diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c index fd1bb15..218e20b 100644 --- a/arch/parisc/kernel/smp.c +++ b/arch/parisc/kernel/smp.c @@ -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; diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c index 157b931..ce939ac 100644 --- a/arch/parisc/mm/init.c +++ b/arch/parisc/mm/init.c @@ -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(); |