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author | Mark Rutland <mark.rutland@arm.com> | 2021-03-15 11:56:29 +0000 |
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committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-03-24 20:19:30 +0000 |
commit | 3889ba70102ed8c609e42c1d3563c8c041ce0511 (patch) | |
tree | ba2dfc38f405ce6e63aa6095e6675334b457dae7 /arch/arm64/include/asm/irq.h | |
parent | f0098155d337cab638cf18e37a3e9257d653d481 (diff) | |
download | lwn-3889ba70102ed8c609e42c1d3563c8c041ce0511.tar.gz lwn-3889ba70102ed8c609e42c1d3563c8c041ce0511.zip |
arm64: irq: allow FIQs to be handled
On contemporary platforms we don't use FIQ, and treat any stray FIQ as a
fatal event. However, some platforms have an interrupt controller wired
to FIQ, and need to handle FIQ as part of regular operation.
So that we can support both cases dynamically, this patch updates the
FIQ exception handling code to operate the same way as the IRQ handling
code, with its own handle_arch_fiq handler. Where a root FIQ handler is
not registered, an unexpected FIQ exception will trigger the default FIQ
handler, which will panic() as today. Where a root FIQ handler is
registered, handling of the FIQ is deferred to that handler.
As el0_fiq_invalid_compat is supplanted by el0_fiq, the former is
removed. For !CONFIG_COMPAT builds we never expect to take an exception
from AArch32 EL0, so we keep the common el0_fiq_invalid handler.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Hector Martin <marcan@marcan.st>
Cc: James Morse <james.morse@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210315115629.57191-7-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/irq.h')
-rw-r--r-- | arch/arm64/include/asm/irq.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h index 8391c6f6f746..fac08e18bcd5 100644 --- a/arch/arm64/include/asm/irq.h +++ b/arch/arm64/include/asm/irq.h @@ -10,6 +10,7 @@ struct pt_regs; int set_handle_irq(void (*handle_irq)(struct pt_regs *)); #define set_handle_irq set_handle_irq +int set_handle_fiq(void (*handle_fiq)(struct pt_regs *)); static inline int nr_legacy_irqs(void) { |