linux-kernel - [tip: irq/core] irqchip/armada-370-xp: Use atomic_io

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Date: Sun, 23 Jun 2024 15:30:29 -0000
From: tip-bot2 for Marek Behún <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: kabel@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
 Andrew Lunn <andrew@...n.ch>, x86@...nel.org, linux-kernel@...r.kernel.org,
 maz@...nel.org
Subject: [tip: irq/core] irqchip/armada-370-xp: Use atomic_io_modify() instead
 of another spinlock

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     50c43447f71c6d0eb9e320c4cc69822d396e52bc
Gitweb:        https://git.kernel.org/tip/50c43447f71c6d0eb9e320c4cc69822d396e52bc
Author:        Marek Behún <kabel@...nel.org>
AuthorDate:    Thu, 20 Jun 2024 11:52:33 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sun, 23 Jun 2024 17:23:08 +02:00

irqchip/armada-370-xp: Use atomic_io_modify() instead of another spinlock

Use the dedicated atomic_io_modify() instead of a open coded spin_lock() +
readl() + writel() + spin_unlock() sequence.

This allows to drop the irq_controller_lock spinlock from the driver.

Signed-off-by: Marek Behún <kabel@...nel.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/irqchip/irq-armada-370-xp.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index 4b021a6..676df71 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -461,24 +461,18 @@ static __init void armada_xp_ipi_init(struct device_node *node)
 	set_smp_ipi_range(base_ipi, IPI_DOORBELL_END);
 }
 
-static DEFINE_RAW_SPINLOCK(irq_controller_lock);
-
 static int armada_xp_set_affinity(struct irq_data *d,
 				  const struct cpumask *mask_val, bool force)
 {
 	irq_hw_number_t hwirq = irqd_to_hwirq(d);
-	unsigned long reg, mask;
 	int cpu;
 
 	/* Select a single core from the affinity mask which is online */
 	cpu = cpumask_any_and(mask_val, cpu_online_mask);
-	mask = 1UL << cpu_logical_map(cpu);
 
-	raw_spin_lock(&irq_controller_lock);
-	reg = readl(main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
-	reg = (reg & (~ARMADA_370_XP_INT_SOURCE_CPU_MASK)) | mask;
-	writel(reg, main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
-	raw_spin_unlock(&irq_controller_lock);
+	atomic_io_modify(main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq),
+			 ARMADA_370_XP_INT_SOURCE_CPU_MASK,
+			 BIT(cpu_logical_map(cpu)));
 
 	irq_data_update_effective_affinity(d, cpumask_of(cpu));