diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/mpic.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/85xx/mpc85xx_ds.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/platforms/86xx/pic.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/sysdev/mpic.c | 59 |
4 files changed, 61 insertions, 6 deletions
diff --git a/arch/powerpc/include/asm/mpic.h b/arch/powerpc/include/asm/mpic.h index 34d9ac433ace..c2ccca53b991 100644 --- a/arch/powerpc/include/asm/mpic.h +++ b/arch/powerpc/include/asm/mpic.h @@ -355,6 +355,8 @@ struct mpic #define MPIC_NO_BIAS 0x00000400 /* Ignore NIRQS as reported by FRR */ #define MPIC_BROKEN_FRR_NIRQS 0x00000800 +/* Destination only supports a single CPU at a time */ +#define MPIC_SINGLE_DEST_CPU 0x00001000 /* MPIC HW modification ID */ #define MPIC_REGSET_MASK 0xf0000000 diff --git a/arch/powerpc/platforms/85xx/mpc85xx_ds.c b/arch/powerpc/platforms/85xx/mpc85xx_ds.c index 483b65cbabae..613bf8c2e30d 100644 --- a/arch/powerpc/platforms/85xx/mpc85xx_ds.c +++ b/arch/powerpc/platforms/85xx/mpc85xx_ds.c @@ -78,7 +78,8 @@ void __init mpc85xx_ds_pic_init(void) mpic = mpic_alloc(np, r.start, MPIC_PRIMARY | MPIC_WANTS_RESET | - MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS, + MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS | + MPIC_SINGLE_DEST_CPU, 0, 256, " OpenPIC "); BUG_ON(mpic == NULL); of_node_put(np); diff --git a/arch/powerpc/platforms/86xx/pic.c b/arch/powerpc/platforms/86xx/pic.c index 8881c5de500d..668275d9e668 100644 --- a/arch/powerpc/platforms/86xx/pic.c +++ b/arch/powerpc/platforms/86xx/pic.c @@ -44,7 +44,8 @@ void __init mpc86xx_init_irq(void) mpic = mpic_alloc(np, res.start, MPIC_PRIMARY | MPIC_WANTS_RESET | - MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS, + MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS | + MPIC_SINGLE_DEST_CPU, 0, 256, " MPIC "); of_node_put(np); BUG_ON(mpic == NULL); diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c index 8e3478c995ef..f6299cca7814 100644 --- a/arch/powerpc/sysdev/mpic.c +++ b/arch/powerpc/sysdev/mpic.c @@ -563,6 +563,51 @@ static void __init mpic_scan_ht_pics(struct mpic *mpic) #endif /* CONFIG_MPIC_U3_HT_IRQS */ +#ifdef CONFIG_SMP +static int irq_choose_cpu(unsigned int virt_irq) +{ + cpumask_t mask = irq_desc[virt_irq].affinity; + int cpuid; + + if (cpus_equal(mask, CPU_MASK_ALL)) { + static int irq_rover; + static DEFINE_SPINLOCK(irq_rover_lock); + unsigned long flags; + + /* Round-robin distribution... */ + do_round_robin: + spin_lock_irqsave(&irq_rover_lock, flags); + + while (!cpu_online(irq_rover)) { + if (++irq_rover >= NR_CPUS) + irq_rover = 0; + } + cpuid = irq_rover; + do { + if (++irq_rover >= NR_CPUS) + irq_rover = 0; + } while (!cpu_online(irq_rover)); + + spin_unlock_irqrestore(&irq_rover_lock, flags); + } else { + cpumask_t tmp; + + cpus_and(tmp, cpu_online_map, mask); + + if (cpus_empty(tmp)) + goto do_round_robin; + + cpuid = first_cpu(tmp); + } + + return cpuid; +} +#else +static int irq_choose_cpu(unsigned int virt_irq) +{ + return hard_smp_processor_id(); +} +#endif #define mpic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq) @@ -777,12 +822,18 @@ void mpic_set_affinity(unsigned int irq, cpumask_t cpumask) struct mpic *mpic = mpic_from_irq(irq); unsigned int src = mpic_irq_to_hw(irq); - cpumask_t tmp; + if (mpic->flags & MPIC_SINGLE_DEST_CPU) { + int cpuid = irq_choose_cpu(irq); - cpus_and(tmp, cpumask, cpu_online_map); + mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid); + } else { + cpumask_t tmp; - mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), - mpic_physmask(cpus_addr(tmp)[0])); + cpus_and(tmp, cpumask, cpu_online_map); + + mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), + mpic_physmask(cpus_addr(tmp)[0])); + } } static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type) |