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| author | Shijith Thotton <sthotton@marvell.com> | 2019-07-05 07:56:20 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 09:10:45 +0200 |
| commit | 75b0fe87722cec3088972f6096925ec91ef35dff (patch) | |
| tree | 65a3f2200aa0a5c082a3170977a876c7d0ee8289 /kernel/irq | |
| parent | 5dface2ce2f28f284502180108aa99e58932c73d (diff) | |
| download | linux-stable-75b0fe87722cec3088972f6096925ec91ef35dff.tar.gz linux-stable-75b0fe87722cec3088972f6096925ec91ef35dff.tar.bz2 linux-stable-75b0fe87722cec3088972f6096925ec91ef35dff.zip | |
genirq: Update irq stats from NMI handlers
[ 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.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/chip.c | 4 | ||||
| -rw-r--r-- | kernel/irq/irqdesc.c | 8 |
2 files changed, 11 insertions, 1 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 3ff4a1260885..b76703b2c0af 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -754,6 +754,8 @@ 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. @@ -968,6 +970,8 @@ 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 c52b737ab8e3..9149dde5a7b0 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -946,6 +946,11 @@ 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 @@ -963,7 +968,8 @@ 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) |