[PATCH 4/8] arm64: don't use GENERIC_IRQ_MULTI_HANDLER

From: Mark Rutland
Date: Fri Feb 19 2021 - 06:41:09 EST


From: Marc Zyngier <maz@xxxxxxxxxx>

In subsequent patches we want to allow irqchip drivers to register as
FIQ handlers, with a set_handle_fiq() function. To keep the IRQ/FIQ
paths similar, we want arm64 to provide both set_handle_irq() and
set_handle_fiq(), rather than using GENERIC_IRQ_MULTI_HANDLER for the
former.

This patch adds an arm64-specific implementation of set_handle_irq().
There should be no functional change as a result of this patch.

Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
[Mark: use a single handler pointer]
Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Hector Martin <marcan@xxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
---
arch/arm64/Kconfig | 1 -
arch/arm64/include/asm/irq.h | 3 +++
arch/arm64/kernel/irq.c | 11 +++++++++++
3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f39568b28ec1..6094214df91b 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -108,7 +108,6 @@ config ARM64
select GENERIC_EARLY_IOREMAP
select GENERIC_IDLE_POLL_SETUP
select GENERIC_IRQ_IPI
- select GENERIC_IRQ_MULTI_HANDLER
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select GENERIC_IRQ_SHOW_LEVEL
diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h
index b2b0c6405eb0..8391c6f6f746 100644
--- a/arch/arm64/include/asm/irq.h
+++ b/arch/arm64/include/asm/irq.h
@@ -8,6 +8,9 @@

struct pt_regs;

+int set_handle_irq(void (*handle_irq)(struct pt_regs *));
+#define set_handle_irq set_handle_irq
+
static inline int nr_legacy_irqs(void)
{
return 0;
diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index dfb1feab867d..ad63bd50fa7b 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c
@@ -71,6 +71,17 @@ static void init_irq_stacks(void)
}
#endif

+void (*handle_arch_irq)(struct pt_regs *) __ro_after_init;
+
+int __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
+{
+ if (handle_arch_irq)
+ return -EBUSY;
+
+ handle_arch_irq = handle_irq;
+ return 0;
+}
+
void __init init_IRQ(void)
{
init_irq_stacks();
--
2.11.0