linux-kernel - [PATCH] irqchip/gic: Enable gic_set

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Message-Id: <1476356234-7570-1-git-send-email-cs.os.kernel@gmail.com>
Date:   Thu, 13 Oct 2016 18:57:14 +0800
From:   Cheng Chao <cs.os.kernel@...il.com>
To:     tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com
Cc:     linux-kernel@...r.kernel.org, Cheng Chao <cs.os.kernel@...il.com>
Subject: [PATCH] irqchip/gic: Enable gic_set_affinity set more than one cpu

GIC can distribute an interrupt to more than one cpu,
but now, gic_set_affinity sets only one cpu to handle interrupt.

Signed-off-by: Cheng Chao <cs.os.kernel@...il.com>
---
 drivers/irqchip/irq-gic.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 58e5b4e..198d33f 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -328,18 +328,38 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 	unsigned int cpu, shift = (gic_irq(d) % 4) * 8;
 	u32 val, mask, bit;
 	unsigned long flags;
+	u32 valid_mask;
 
-	if (!force)
-		cpu = cpumask_any_and(mask_val, cpu_online_mask);
-	else
+	if (!force) {
+		valid_mask = cpumask_bits(mask_val)[0];
+		valid_mask &= cpumask_bits(cpu_online_mask)[0];
+
+		cpu = cpumask_any((struct cpumask *)&valid_mask);
+	} else {
 		cpu = cpumask_first(mask_val);
+	}
 
 	if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
 		return -EINVAL;
 
 	gic_lock_irqsave(flags);
 	mask = 0xff << shift;
-	bit = gic_cpu_map[cpu] << shift;
+
+	if (!force) {
+		bit = 0;
+
+		for_each_cpu(cpu, (struct cpumask *)&valid_mask) {
+			if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
+				break;
+
+			bit |= gic_cpu_map[cpu];
+		}
+
+		bit = bit << shift;
+	} else {
+		bit = gic_cpu_map[cpu] << shift;
+	}
+
 	val = readl_relaxed(reg) & ~mask;
 	writel_relaxed(val | bit, reg);
 	gic_unlock_irqrestore(flags);
-- 
2.4.11