Commit f0c7baca authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

genirq/affinity: Make affinity setting if activated opt-in 



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: baedb87d ("genirq/affinity: Handle affinity setting on inactive interrupts correctly")
Reported-by: default avatarJohn Keeping <john@metanate.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarMarc Zyngier <maz@kernel.org>
Acked-by: default avatarMarc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/87blk4tzgm.fsf@nanos.tec.linutronix.de
parent ec016089

arch/x86/kernel/apic/vector.c

+4 −0
Original line number Diff line number Diff line
@@ -560,6 +560,10 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq, 
		 * as that can corrupt the affinity move state.

		 */

		irqd_set_handle_enforce_irqctx(irqd);



		/* Don't invoke affinity setter on deactivated interrupts */

		irqd_set_affinity_on_activate(irqd);



		/*

		 * Legacy vectors are already assigned when the IOAPIC

		 * takes them over. They stay on the same vector. This is

drivers/irqchip/irq-gic-v3-its.c

+4 −1
Original line number Diff line number Diff line
@@ -3523,6 +3523,7 @@ 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 its_node *its = its_dev->its;

	struct irq_data *irqd;

	irq_hw_number_t hwirq;

	int err;

	int i;
@@ -3542,7 +3543,9 @@ 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);

include/linux/irq.h

+13 −0
Original line number Diff line number Diff line
@@ -213,6 +213,8 @@ struct irq_data { 
 *				  required

 * IRQD_HANDLE_ENFORCE_IRQCTX	- Enforce that handle_irq_*() is only invoked

 *				  from actual interrupt context.

 * IRQD_AFFINITY_ON_ACTIVATE	- Affinity is set on activation. Don't call

 *				  irq_chip::irq_set_affinity() when deactivated.

 */

enum {

	IRQD_TRIGGER_MASK		= 0xf,
@@ -237,6 +239,7 @@ enum { 
	IRQD_CAN_RESERVE		= (1 << 26),

	IRQD_MSI_NOMASK_QUIRK		= (1 << 27),

	IRQD_HANDLE_ENFORCE_IRQCTX	= (1 << 28),

	IRQD_AFFINITY_ON_ACTIVATE	= (1 << 29),

};



#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
@@ -421,6 +424,16 @@ static inline bool irqd_msi_nomask_quirk(struct irq_data *d) 
	return __irqd_to_state(d) & IRQD_MSI_NOMASK_QUIRK;

}



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)

kernel/irq/manage.c

+5 −1
Original line number Diff line number Diff line
@@ -320,12 +320,16 @@ 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);

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