linux-kernel - [PATCH 3/3] irqchip: xilinx: Use handle_domain

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Date:   Wed, 12 Feb 2020 09:39:58 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com
Cc:     Stefan Asserhall <stefan.asserhall@...inx.com>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 3/3] irqchip: xilinx: Use handle_domain_irq()

Call generic domain specific irq handler which does the most of things
self. Also get rid of concurrent_irq counting which hasn't been exported
anywhere.
Based on this loop was also optimized by using do/while loop instead of
goto loop.

Signed-off-by: Michal Simek <michal.simek@...inx.com>
Reviewed-by: Stefan Asserhall <stefan.asserhall@...inx.com>
---

 arch/microblaze/Kconfig           |  1 +
 arch/microblaze/kernel/irq.c      |  5 ----
 drivers/irqchip/irq-xilinx-intc.c | 44 +++++++++++--------------------
 3 files changed, 16 insertions(+), 34 deletions(-)

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 3a314aa2efa1..242f58ec086b 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -48,6 +48,7 @@ config MICROBLAZE
 	select MMU_GATHER_NO_RANGE if MMU
 	select SPARSE_IRQ
 	select GENERIC_IRQ_MULTI_HANDLER
+	select HANDLE_DOMAIN_IRQ
 
 # Endianness selection
 choice
diff --git a/arch/microblaze/kernel/irq.c b/arch/microblaze/kernel/irq.c
index 1f8cb4c4f74f..0b37dde60a1e 100644
--- a/arch/microblaze/kernel/irq.c
+++ b/arch/microblaze/kernel/irq.c
@@ -22,13 +22,8 @@
 
 void __irq_entry do_IRQ(struct pt_regs *regs)
 {
-	struct pt_regs *old_regs = set_irq_regs(regs);
 	trace_hardirqs_off();
-
-	irq_enter();
 	handle_arch_irq(regs);
-	irq_exit();
-	set_irq_regs(old_regs);
 	trace_hardirqs_on();
 }
 
diff --git a/drivers/irqchip/irq-xilinx-intc.c b/drivers/irqchip/irq-xilinx-intc.c
index ad9e678c24ac..fa468e618762 100644
--- a/drivers/irqchip/irq-xilinx-intc.c
+++ b/drivers/irqchip/irq-xilinx-intc.c
@@ -125,20 +125,6 @@ static unsigned int xintc_get_irq_local(struct xintc_irq_chip *irqc)
 	return irq;
 }
 
-static unsigned int xintc_get_irq(void)
-{
-	u32 hwirq;
-	unsigned int irq = -1;
-
-	hwirq = xintc_read(primary_intc, IVR);
-	if (hwirq != -1U)
-		irq = irq_find_mapping(primary_intc->root_domain, hwirq);
-
-	pr_debug("irq-xilinx: hwirq=%d, irq=%d\n", hwirq, irq);
-
-	return irq;
-}
-
 static int xintc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
 {
 	struct xintc_irq_chip *irqc = d->host_data;
@@ -178,23 +164,23 @@ static void xil_intc_irq_handler(struct irq_desc *desc)
 	chained_irq_exit(chip, desc);
 }
 
-static u32 concurrent_irq;
-
 static void xil_intc_handle_irq(struct pt_regs *regs)
 {
-	unsigned int irq;
-
-	irq = xintc_get_irq();
-next_irq:
-	BUG_ON(!irq);
-	generic_handle_irq(irq);
-
-	irq = xintc_get_irq();
-	if (irq != -1U) {
-		pr_debug("next irq: %d\n", irq);
-		++concurrent_irq;
-		goto next_irq;
-	}
+	u32 hwirq;
+	struct xintc_irq_chip *irqc = primary_intc;
+
+	do {
+		hwirq = xintc_read(irqc, IVR);
+		if (hwirq != -1U) {
+			int ret;
+
+			ret = handle_domain_irq(irqc->root_domain, hwirq, regs);
+			WARN_ONCE(ret, "Unhandled HWIRQ %d\n", hwirq);
+			continue;
+		}
+
+		break;
+	} while (1);
 }
 
 static int __init xilinx_intc_of_init(struct device_node *intc,
-- 
2.25.0