With this patch we can set irq affinity via procfs, so as to improve
network performance.
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
arch/mips/include/asm/irq.h | 3 ++
arch/mips/loongson64/loongson-3/irq.c | 62 +++++++++++++++++++++++++++--------
drivers/irqchip/irq-i8259.c | 3 ++
3 files changed, 55 insertions(+), 13 deletions(-)
diff --git a/arch/mips/include/asm/irq.h b/arch/mips/include/asm/irq.h
index 6bf10e7..19a26c4 100644
--- a/arch/mips/include/asm/irq.h
+++ b/arch/mips/include/asm/irq.h
@@ -26,6 +26,7 @@ static inline int irq_canonicalize(int irq)
#define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */
#endif
+struct irq_data;
asmlinkage void plat_irq_dispatch(void);
extern void do_IRQ(unsigned int irq);
@@ -36,6 +37,8 @@ extern void spurious_interrupt(void);
extern int allocate_irqno(void);
extern void alloc_legacy_irqno(void);
extern void free_irqno(unsigned int irq);
+extern int plat_set_irq_affinity(struct irq_data *d,
+ const struct cpumask *affinity, bool force);
/*
* Before R2 the timer and performance counter interrupts were both fixed to
diff --git a/arch/mips/loongson64/loongson-3/irq.c b/arch/mips/loongson64/loongson-3/irq.c
index b548a95..27e4ed3 100644
--- a/arch/mips/loongson64/loongson-3/irq.c
+++ b/arch/mips/loongson64/loongson-3/irq.c
@@ -10,32 +10,68 @@
#include "smp.h"
extern void loongson3_send_irq_by_ipi(int cpu, int irqs);
+
+unsigned int irq_cpu[16] = {[0 ... 15] = -1};
unsigned int ht_irq[] = {0, 1, 3, 4, 5, 6, 7, 8, 12, 14, 15};
unsigned int local_irq = 1<<0 | 1<<1 | 1<<2 | 1<<7 | 1<<8 | 1<<12;
+int plat_set_irq_affinity(struct irq_data *d, const struct cpumask *affinity,
+ bool force)
+{
+ unsigned int cpu;
+ struct cpumask new_affinity;
+
+ /* I/O devices are connected on package-0 */
+ cpumask_copy(&new_affinity, affinity);
+ for_each_cpu(cpu, affinity)
+ if (cpu_data[cpu].package > 0)
+ cpumask_clear_cpu(cpu, &new_affinity);
+
+ if (cpumask_empty(&new_affinity))
+ return -EINVAL;
+
+ cpumask_copy(d->common->affinity, &new_affinity);
+
+ return IRQ_SET_MASK_OK_NOCOPY;
+}
+
static void ht_irqdispatch(void)
{
- unsigned int i, irq, irq0, irq1;
- static unsigned int dest_cpu = 0;
+ unsigned int i, irq;
+ struct irq_data *irqd;
+ struct cpumask affinity;
irq = LOONGSON_HT1_INT_VECTOR(0);
LOONGSON_HT1_INT_VECTOR(0) = irq; /* Acknowledge the IRQs */
- irq0 = irq & local_irq; /* handled by local core */
- irq1 = irq & ~local_irq; /* balanced by other cores */
+ for (i = 0; i < ARRAY_SIZE(ht_irq); i++) {
+ if (!(irq & (0x1 << ht_irq[i])))
+ continue;
- if (dest_cpu == 0 || !cpu_online(dest_cpu))
- irq0 |= irq1;
- else
- loongson3_send_irq_by_ipi(dest_cpu, irq1);
+ /* handled by local core */
+ if (local_irq & (0x1 << ht_irq[i])) {
+ do_IRQ(ht_irq[i]);
+ continue;
+ }
- dest_cpu = dest_cpu + 1;
- if (dest_cpu >= num_possible_cpus() || cpu_data[dest_cpu].package > 0)
- dest_cpu = 0;
+ irqd = irq_get_irq_data(ht_irq[i]);
+ cpumask_and(&affinity, irqd->common->affinity, cpu_active_mask);
+ if (cpumask_empty(&affinity)) {
+ do_IRQ(ht_irq[i]);
+ continue;
+ }
- for (i = 0; i < ARRAY_SIZE(ht_irq); i++) {
- if (irq0 & (0x1 << ht_irq[i]))
+ irq_cpu[ht_irq[i]] = cpumask_next(irq_cpu[ht_irq[i]], &affinity);
+ if (irq_cpu[ht_irq[i]] >= nr_cpu_ids)
+ irq_cpu[ht_irq[i]] = cpumask_first(&affinity);
+
+ if (irq_cpu[ht_irq[i]] == 0) {
do_IRQ(ht_irq[i]);
+ continue;
+ }
+
+ /* balanced by other cores */
+ loongson3_send_irq_by_ipi(irq_cpu[ht_irq[i]], (0x1 << ht_irq[i]));
}
}
diff --git a/drivers/irqchip/irq-i8259.c b/drivers/irqchip/irq-i8259.c
index 1aec12c..95d21e3 100644
--- a/drivers/irqchip/irq-i8259.c
+++ b/drivers/irqchip/irq-i8259.c
@@ -46,6 +46,9 @@ static struct irq_chip i8259A_chip = {
.irq_disable = disable_8259A_irq,
.irq_unmask = enable_8259A_irq,
.irq_mask_ack = mask_and_ack_8259A,
+#ifdef CONFIG_CPU_LOONGSON3
+ .irq_set_affinity = plat_set_irq_affinity,
+#endif
};
/*
--
2.7.0
