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authorWill Deacon <will.deacon@arm.com>2017-07-25 16:30:34 +0100
committerWill Deacon <will.deacon@arm.com>2017-07-27 13:43:22 +0100
commita3287c41ff405025bc57b165a0f6cd698bbbc1be (patch)
tree070b5f8986d50c1a2e72160871937f43f8c359f4 /arch/arm/mach-ux500
parentd0153c7ff9226535a51e6a81f61656c9500957f4 (diff)
downloadlinux-a3287c41ff405025bc57b165a0f6cd698bbbc1be.tar.bz2
drivers/perf: arm_pmu: Request PMU SPIs with IRQF_PER_CPU
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>
Diffstat (limited to 'arch/arm/mach-ux500')
-rw-r--r--arch/arm/mach-ux500/cpu-db8500.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index 28083ef72819..71a34e8c345a 100644
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -133,6 +133,7 @@ static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
static struct arm_pmu_platdata db8500_pmu_platdata = {
.handle_irq = db8500_pmu_handler,
+ .irq_flags = IRQF_NOBALANCING | IRQF_NO_THREAD,
};
static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {