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MIPS: Loongson-3: support irq_set_affinity() in i8259 chip 

With this patch we can set irq affinity via procfs, so as to improve
network performance.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J . Hill <Steven.Hill@cavium.com>
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16590/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Huacai Chen 2017-06-22 23:06:53 +08:00 committed by Ralf Baechle
parent e1b88ca8d7
commit ecc38a0968
1 changed files with 56 additions and 15 deletions
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71
arch/mips/loongson64/loongson-3/irq.c
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@ -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 */
if (dest_cpu == 0 || !cpu_online(dest_cpu))
irq0 |= irq1;
else
loongson3_send_irq_by_ipi(dest_cpu, irq1);
dest_cpu = dest_cpu + 1;
if (dest_cpu >= num_possible_cpus() || cpu_data[dest_cpu].package > 0)
dest_cpu = 0;
for (i = 0; i < ARRAY_SIZE(ht_irq); i++) {
if (irq0 & (0x1 << ht_irq[i]))
if (!(irq & (0x1 << ht_irq[i])))
continue;
/* handled by local core */
if (local_irq & (0x1 << ht_irq[i])) {
do_IRQ(ht_irq[i]);
continue;
}
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;
}
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]));
}
}
@ -135,11 +171,16 @@ void irq_router_init(void)
void __init mach_init_irq(void)
{
struct irq_chip *chip;
clear_c0_status(ST0_IM | ST0_BEV);
irq_router_init();
mips_cpu_irq_init();
init_i8259_irqs();
chip = irq_get_chip(I8259A_IRQ_BASE);
chip->irq_set_affinity = plat_set_irq_affinity;
irq_set_chip_and_handler(LOONGSON_UART_IRQ,
&loongson_irq_chip, handle_level_irq);