From: Shijith Thotton sthotton@marvell.com
[ Upstream commit c09cb1293523dd786ae54a12fd88001542cba2f6 ]
The NMI handlers handle_percpu_devid_fasteoi_nmi() and handle_fasteoi_nmi() do not update the interrupt counts. Due to that the NMI interrupt count does not show up correctly in /proc/interrupts.
Add the statistics and treat the NMI handlers in the same way as per cpu interrupts and prevent them from updating irq_desc::tot_count as this might be corrupted due to concurrency.
[ tglx: Massaged changelog ]
Fixes: 2dcf1fbcad35 ("genirq: Provide NMI handlers") Signed-off-by: Shijith Thotton sthotton@marvell.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Link: https://lkml.kernel.org/r/1562313336-11888-1-git-send-email-sthotton@marvell... Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/irq/chip.c | 4 ++++ kernel/irq/irqdesc.c | 8 +++++++- 2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 51128bea3846..9209a60d9b85 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -748,6 +748,8 @@ void handle_fasteoi_nmi(struct irq_desc *desc) unsigned int irq = irq_desc_get_irq(desc); irqreturn_t res;
+ __kstat_incr_irqs_this_cpu(desc); + trace_irq_handler_entry(irq, action); /* * NMIs cannot be shared, there is only one action. @@ -962,6 +964,8 @@ void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc) unsigned int irq = irq_desc_get_irq(desc); irqreturn_t res;
+ __kstat_incr_irqs_this_cpu(desc); + trace_irq_handler_entry(irq, action); res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id)); trace_irq_handler_exit(irq, action, res); diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 9f8a709337cf..8a93df71673d 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -945,6 +945,11 @@ unsigned int kstat_irqs_cpu(unsigned int irq, int cpu) *per_cpu_ptr(desc->kstat_irqs, cpu) : 0; }
+static bool irq_is_nmi(struct irq_desc *desc) +{ + return desc->istate & IRQS_NMI; +} + /** * kstat_irqs - Get the statistics for an interrupt * @irq: The interrupt number @@ -962,7 +967,8 @@ unsigned int kstat_irqs(unsigned int irq) if (!desc || !desc->kstat_irqs) return 0; if (!irq_settings_is_per_cpu_devid(desc) && - !irq_settings_is_per_cpu(desc)) + !irq_settings_is_per_cpu(desc) && + !irq_is_nmi(desc)) return desc->tot_count;
for_each_possible_cpu(cpu)