[PATCH] irqchip/gic: Enable gic_set_affinity set more than one cpu

From: Cheng Chao
Date: Thu Oct 13 2016 - 06:57:45 EST


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@xxxxxxxxx>
---
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