https://github.com/torvalds/linux
Revision a3287c41ff405025bc57b165a0f6cd698bbbc1be authored by Will Deacon on 25 July 2017, 15:30:34 UTC, committed by Will Deacon on 27 July 2017, 12:43:22 UTC
Since the PMU register interface is banked per CPU, CPU PMU interrrupts cannot be handled by a CPU other than the one with the PMU asserting the interrupt. This means that migrating PMU SPIs, as we do during a CPU hotplug operation doesn't make any sense and can lead to the IRQ being disabled entirely if we route a spurious IRQ to the new affinity target. This has been observed in practice on AMD Seattle, where CPUs on the non-boot cluster appear to take a spurious PMU IRQ when coming online, which is routed to CPU0 where it cannot be handled. This patch passes IRQF_PERCPU for PMU SPIs and forcefully sets their affinity prior to requesting them, ensuring that they cannot be migrated during hotplug events. This interacts badly with the DB8500 erratum workaround that ping-pongs the interrupt affinity from the handler, so we avoid passing IRQF_PERCPU in that case by allowing the IRQ flags to be overridden in the platdata. Fixes: 3cf7ee98b848 ("drivers/perf: arm_pmu: move irq request/free into probe") Cc: Mark Rutland <mark.rutland@arm.com> Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
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Tip revision: a3287c41ff405025bc57b165a0f6cd698bbbc1be authored by Will Deacon on 25 July 2017, 15:30:34 UTC
drivers/perf: arm_pmu: Request PMU SPIs with IRQF_PER_CPU
drivers/perf: arm_pmu: Request PMU SPIs with IRQF_PER_CPU
Tip revision: a3287c4
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COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 96.2 KB |
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Kconfig | -rw-r--r-- | 252 bytes |
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