From 6a7a29935d98567331ae26b183422e22f4d0ae90 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 24 Jul 2020 22:44:41 +0200 Subject: [PATCH] genirq/affinity: Make affinity setting if activated opt-in commit f0c7baca180046824e07fc5f1326e83a8fd150c7 upstream. John reported that on a RK3288 system the perf per CPU interrupts are all affine to CPU0 and provided the analysis: "It looks like what happens is that because the interrupts are not per-CPU in the hardware, armpmu_request_irq() calls irq_force_affinity() while the interrupt is deactivated and then request_irq() with IRQF_PERCPU | IRQF_NOBALANCING. Now when irq_startup() runs with IRQ_STARTUP_NORMAL, it calls irq_setup_affinity() which returns early because IRQF_PERCPU and IRQF_NOBALANCING are set, leaving the interrupt on its original CPU." This was broken by the recent commit which blocked interrupt affinity setting in hardware before activation of the interrupt. While this works in general, it does not work for this particular case. As contrary to the initial analysis not all interrupt chip drivers implement an activate callback, the safe cure is to make the deferred interrupt affinity setting at activation time opt-in. Implement the necessary core logic and make the two irqchip implementations for which this is required opt-in. In hindsight this would have been the right thing to do, but ... Fixes: baedb87d1b53 ("genirq/affinity: Handle affinity setting on inactive interrupts correctly") Reported-by: John Keeping Signed-off-by: Thomas Gleixner Tested-by: Marc Zyngier Acked-by: Marc Zyngier Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/87blk4tzgm.fsf@nanos.tec.linutronix.de [fllinden@amazon.com - backported to 4.14] Signed-off-by: Frank van der Linden Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/apic/vector.c | 4 ++++ drivers/irqchip/irq-gic-v3-its.c | 5 ++++- include/linux/irq.h | 12 ++++++++++++ kernel/irq/manage.c | 6 +++++- 4 files changed, 25 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index 36cd34524ac1..637cf4dfccc9 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -368,6 +368,10 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq, irq_data->chip = &lapic_controller; irq_data->chip_data = data; irq_data->hwirq = virq + i; + + /* Don't invoke affinity setter on deactivated interrupts */ + irqd_set_affinity_on_activate(irq_data); + err = assign_irq_vector_policy(virq + i, node, data, info, irq_data); if (err) { diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 84b23d902d5b..1d2267c6d31a 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -2199,6 +2199,7 @@ static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, { msi_alloc_info_t *info = args; struct its_device *its_dev = info->scratchpad[0].ptr; + struct irq_data *irqd; irq_hw_number_t hwirq; int err; int i; @@ -2214,7 +2215,9 @@ static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, &its_irq_chip, its_dev); - irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq + i))); + irqd = irq_get_irq_data(virq + i); + irqd_set_single_target(irqd); + irqd_set_affinity_on_activate(irqd); pr_debug("ID:%d pID:%d vID:%d\n", (int)(hwirq + i - its_dev->event_map.lpi_base), (int)(hwirq + i), virq + i); diff --git a/include/linux/irq.h b/include/linux/irq.h index 0d53626405bf..c08758a63d26 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -212,6 +212,8 @@ struct irq_data { * mask. Applies only to affinity managed irqs. * IRQD_SINGLE_TARGET - IRQ allows only a single affinity target * IRQD_DEFAULT_TRIGGER_SET - Expected trigger already been set + * IRQD_AFFINITY_ON_ACTIVATE - Affinity is set on activation. Don't call + * irq_chip::irq_set_affinity() when deactivated. */ enum { IRQD_TRIGGER_MASK = 0xf, @@ -233,6 +235,7 @@ enum { IRQD_MANAGED_SHUTDOWN = (1 << 23), IRQD_SINGLE_TARGET = (1 << 24), IRQD_DEFAULT_TRIGGER_SET = (1 << 25), + IRQD_AFFINITY_ON_ACTIVATE = (1 << 29), }; #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) @@ -377,6 +380,15 @@ static inline bool irqd_is_managed_and_shutdown(struct irq_data *d) return __irqd_to_state(d) & IRQD_MANAGED_SHUTDOWN; } +static inline void irqd_set_affinity_on_activate(struct irq_data *d) +{ + __irqd_to_state(d) |= IRQD_AFFINITY_ON_ACTIVATE; +} + +static inline bool irqd_affinity_on_activate(struct irq_data *d) +{ + return __irqd_to_state(d) & IRQD_AFFINITY_ON_ACTIVATE; +} #undef __irqd_to_state static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index ce6fba446814..3193be58805c 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -221,12 +221,16 @@ static bool irq_set_affinity_deactivated(struct irq_data *data, struct irq_desc *desc = irq_data_to_desc(data); /* + * Handle irq chips which can handle affinity only in activated + * state correctly + * * If the interrupt is not yet activated, just store the affinity * mask and do not call the chip driver at all. On activation the * driver has to make sure anyway that the interrupt is in a * useable state so startup works. */ - if (!IS_ENABLED(CONFIG_IRQ_DOMAIN_HIERARCHY) || irqd_is_activated(data)) + if (!IS_ENABLED(CONFIG_IRQ_DOMAIN_HIERARCHY) || + irqd_is_activated(data) || !irqd_affinity_on_activate(data)) return false; cpumask_copy(desc->irq_common_data.affinity, mask); -- 2.20.1