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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: Julien Thierry <julien.thierry@arm.com>
Acked-by: Marc 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: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Julien Thierry 2019-01-31 14:58:58 +00:00 committed by Catalin Marinas
parent d98d0a990c
commit f32c926651
1 changed files with 36 additions and 6 deletions
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42
drivers/irqchip/irq-gic-v3.c
View File

@ -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;
}