@@ -106,10 +106,21 @@ static struct irq_chip arcv2_irq_chip = {
static int arcv2_irq_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hw)
{
- if (irq == TIMER0_IRQ || irq == IPI_IRQ)
+ /*
+ * core intc IRQs [16, 23]:
+ * Statically assigned always private-per-core (Timers, WDT, IPI, PCT)
+ */
+ if (hw < 24) {
+ /*
+ * A subsequent request_percpu_irq() fails if percpu_devid is
+ * not set. That in turns sets NOAUTOEN, meaning each core needs
+ * to call enable_percpu_irq()
+ */
+ irq_set_percpu_devid(irq);
irq_set_chip_and_handler(irq, &arcv2_irq_chip, handle_percpu_irq);
- else
+ } else {
irq_set_chip_and_handler(irq, &arcv2_irq_chip, handle_level_irq);
+ }
return 0;
}
As part of fixing another perf issue, observed that after a perf run, the interrupt got disabled on one/more cores. | [ARCLinux]# cat /proc/interrupts | grep perf | 20: 0 0 0 0 ARCv2 core Intc 20 ARC perf counters | | [ARCLinux]# perf record -c 20000 /sbin/hackbench | Running with 10*40 (== 400) tasks. | | [ARCLinux]# cat /proc/interrupts | grep perf | 20: 0 522 8 51916 ARCv2 core Intc 20 ARC perf counters | | [ARCLinux]# perf record -c 20000 /sbin/hackbench | Running with 10*40 (== 400) tasks. | | [ARCLinux]# cat /proc/interrupts | grep perf | 20: 0 522 8 104368 ARCv2 core Intc 20 ARC perf counters Turns out that despite requesting perf irq as percpu, the flow handler registered was not handle_percpu_irq() Given that on ARCv2 cores, IRQs < 24 are always private to cpu, we register the right handler at the very onset. Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Alexey Brodkin <abrodkin@synopsys.com> Cc: stable@vger.kernel.org #4.2+ Cc: linux-kernel@vger.kernel.org Signed-off-by: Vineet Gupta <vgupta@synopsys.com> --- arch/arc/kernel/intc-arcv2.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)