diff options
| author | Julien Thierry <julien.thierry@arm.com> | 2019-01-31 15:58:58 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2019-02-06 11:05:21 +0100 |
| commit | f32c926651dcd1683f4d896ee52609000a62a3dc (patch) | |
| tree | 610354a9d8c4f083dbac6311e15c606a62a231a7 /drivers/irqchip | |
| parent | irqchip/gic-v3: Detect if GIC can support pseudo-NMIs (diff) | |
| download | linux-f32c926651dcd1683f4d896ee52609000a62a3dc.tar.xz linux-f32c926651dcd1683f4d896ee52609000a62a3dc.zip | |
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>
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3.c | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index eb9d9486f90b..c2767fbc2e66 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -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; } |