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Commit f32c9266 authored by Julien Thierry's avatar Julien Thierry Committed by Catalin Marinas
Browse files

irqchip/gic-v3: Handle pseudo-NMIs 



Provide a higher priority to be used for pseudo-NMIs. When such an
interrupt is received, keep interrupts fully disabled at CPU level to
prevent receiving other pseudo-NMIs while handling the current one.

Signed-off-by: default avatarJulien Thierry <julien.thierry@arm.com>
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent d98d0a99

drivers/irqchip/irq-gic-v3.c

+36 −6
Original line number Diff line number Diff line
@@ -41,6 +41,8 @@ 


#include "irq-gic-common.h"



#define GICD_INT_NMI_PRI	(GICD_INT_DEF_PRI & ~0x80)



#define FLAGS_WORKAROUND_GICR_WAKER_MSM8996	(1ULL << 0)



struct redist_region {
@@ -381,12 +383,45 @@ static u64 gic_mpidr_to_affinity(unsigned long mpidr) 
	return aff;

}



static void gic_deactivate_unhandled(u32 irqnr)

{

	if (static_branch_likely(&supports_deactivate_key)) {

		if (irqnr < 8192)

			gic_write_dir(irqnr);

	} else {

		gic_write_eoir(irqnr);

	}

}



static inline void gic_handle_nmi(u32 irqnr, struct pt_regs *regs)

{

	int err;



	if (static_branch_likely(&supports_deactivate_key))

		gic_write_eoir(irqnr);

	/*

	 * Leave the PSR.I bit set to prevent other NMIs to be

	 * received while handling this one.

	 * PSR.I will be restored when we ERET to the

	 * interrupted context.

	 */

	err = handle_domain_nmi(gic_data.domain, irqnr, regs);

	if (err)

		gic_deactivate_unhandled(irqnr);

}



static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)

{

	u32 irqnr;



	irqnr = gic_read_iar();



	if (gic_supports_nmi() &&

	    unlikely(gic_read_rpr() == GICD_INT_NMI_PRI)) {

		gic_handle_nmi(irqnr, regs);

		return;

	}



	if (gic_prio_masking_enabled()) {

		gic_pmr_mask_irqs();

		gic_arch_enable_irqs();
@@ -403,12 +438,7 @@ static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs 
		err = handle_domain_irq(gic_data.domain, irqnr, regs);

		if (err) {

			WARN_ONCE(true, "Unexpected interrupt received!\n");

			if (static_branch_likely(&supports_deactivate_key)) {

				if (irqnr < 8192)

					gic_write_dir(irqnr);

			} else {

				gic_write_eoir(irqnr);

			}

			gic_deactivate_unhandled(irqnr);

		}

		return;

	}