[PATCH 07/15] irq: nds32: avoid CONFIG_HANDLE_DOMAIN_IRQ

Mark Rutland
2021-10-21T18:03:24Z

In preparation for removing HANDLE_DOMAIN_IRQ, have arch/nds32 perform
all the necessary IRQ entry accounting in its entry code.

Currently arch/nds32 is tightly coupled with the ativic32 irqchip, and
while the entry code should logically live under arch/nds32/, moving the
entry logic there makes things more convoluted. So for now, place the
entry logic in the ativic32 irqchip, but separated into a separate
function to make the split of responsibility clear.

In future this should probably use GENERIC_IRQ_MULTI_HANDLER to cleanly
decouple this.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vincent Chen <deanbo422@gmail.com>
---
arch/nds32/Kconfig | 1 -
drivers/irqchip/irq-ativic32.c | 22 ++++++++++++++++++++--
2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
index aea26e739543..4d1421b18734 100644
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig
@@ -27,7 +27,6 @@ config NDS32
select GENERIC_LIB_MULDI3
select GENERIC_LIB_UCMPDI2
select GENERIC_TIME_VSYSCALL
- select HANDLE_DOMAIN_IRQ
select HAVE_ARCH_TRACEHOOK
select HAVE_DEBUG_KMEMLEAK
select HAVE_EXIT_THREAD
diff --git a/drivers/irqchip/irq-ativic32.c b/drivers/irqchip/irq-ativic32.c
index 476d6024aaf2..223dd2f97d28 100644
--- a/drivers/irqchip/irq-ativic32.c
+++ b/drivers/irqchip/irq-ativic32.c
@@ -5,11 +5,14 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
+#include <linux/hardirq.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/irqchip.h>
#include <nds32_intrinsic.h>

+#include <asm/irq_regs.h>
+
unsigned long wake_mask;

static void ativic32_ack_irq(struct irq_data *data)
@@ -103,10 +106,25 @@ static irq_hw_number_t get_intr_src(void)
- NDS32_VECTOR_offINTERRUPT;
}

-asmlinkage void asm_do_IRQ(struct pt_regs *regs)
+static void ativic32_handle_irq(struct pt_regs *regs)
{
irq_hw_number_t hwirq = get_intr_src();
- handle_domain_irq(root_domain, hwirq, regs);
+ generic_handle_domain_irq(root_domain, hwirq);
+}
+
+/*
+ * TODO: convert nds32 to GENERIC_IRQ_MULTI_HANDLER so that this entry logic
+ * can live in arch code.
+ */
+asmlinkage void asm_do_IRQ(struct pt_regs *regs)
+{
+ struct pt_regs *old_regs;
+
+ irq_enter();
+ old_regs = set_irq_regs(regs);
+ ativic32_handle_irq(regs);
+ set_irq_regs(old_regs);
+ irq_exit();
}

int __init ativic32_init_irq(struct device_node *node, struct device_node *parent)
--
2.11.0