diff options
| -rw-r--r-- | arch/mips/include/asm/smp.h | 14 | ||||
| -rw-r--r-- | arch/mips/kernel/smp.c | 61 |
2 files changed, 67 insertions, 8 deletions
diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h index 8bc6c70a4030..060f23ff1817 100644 --- a/arch/mips/include/asm/smp.h +++ b/arch/mips/include/asm/smp.h @@ -85,6 +85,20 @@ static inline void __cpu_die(unsigned int cpu) extern void play_dead(void); #endif +/* + * This function will set up the necessary IPIs for Linux to communicate + * with the CPUs in mask. + * Return 0 on success. + */ +int mips_smp_ipi_allocate(const struct cpumask *mask); + +/* + * This function will free up IPIs allocated with mips_smp_ipi_allocate to the + * CPUs in mask, which must be a subset of the IPIs that have been configured. + * Return 0 on success. + */ +int mips_smp_ipi_free(const struct cpumask *mask); + static inline void arch_send_call_function_single_ipi(int cpu) { extern struct plat_smp_ops *mp_ops; /* private */ diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index cb02df215365..0e131c9c39f6 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c @@ -231,7 +231,7 @@ static struct irqaction irq_call = { .name = "IPI call" }; -static __init void smp_ipi_init_one(unsigned int virq, +static void smp_ipi_init_one(unsigned int virq, struct irqaction *action) { int ret; @@ -241,9 +241,11 @@ static __init void smp_ipi_init_one(unsigned int virq, BUG_ON(ret); } -static int __init mips_smp_ipi_init(void) +static unsigned int call_virq, sched_virq; + +int mips_smp_ipi_allocate(const struct cpumask *mask) { - unsigned int call_virq, sched_virq; + int virq; struct irq_domain *ipidomain; struct device_node *node; @@ -270,16 +272,20 @@ static int __init mips_smp_ipi_init(void) if (!ipidomain) return 0; - call_virq = irq_reserve_ipi(ipidomain, cpu_possible_mask); - BUG_ON(!call_virq); + virq = irq_reserve_ipi(ipidomain, mask); + BUG_ON(!virq); + if (!call_virq) + call_virq = virq; - sched_virq = irq_reserve_ipi(ipidomain, cpu_possible_mask); - BUG_ON(!sched_virq); + virq = irq_reserve_ipi(ipidomain, mask); + BUG_ON(!virq); + if (!sched_virq) + sched_virq = virq; if (irq_domain_is_ipi_per_cpu(ipidomain)) { int cpu; - for_each_cpu(cpu, cpu_possible_mask) { + for_each_cpu(cpu, mask) { smp_ipi_init_one(call_virq + cpu, &irq_call); smp_ipi_init_one(sched_virq + cpu, &irq_resched); } @@ -288,6 +294,45 @@ static int __init mips_smp_ipi_init(void) smp_ipi_init_one(sched_virq, &irq_resched); } + return 0; +} + +int mips_smp_ipi_free(const struct cpumask *mask) +{ + struct irq_domain *ipidomain; + struct device_node *node; + + node = of_irq_find_parent(of_root); + ipidomain = irq_find_matching_host(node, DOMAIN_BUS_IPI); + + /* + * Some platforms have half DT setup. So if we found irq node but + * didn't find an ipidomain, try to search for one that is not in the + * DT. + */ + if (node && !ipidomain) + ipidomain = irq_find_matching_host(NULL, DOMAIN_BUS_IPI); + + BUG_ON(!ipidomain); + + if (irq_domain_is_ipi_per_cpu(ipidomain)) { + int cpu; + + for_each_cpu(cpu, mask) { + remove_irq(call_virq + cpu, &irq_call); + remove_irq(sched_virq + cpu, &irq_resched); + } + } + irq_destroy_ipi(call_virq, mask); + irq_destroy_ipi(sched_virq, mask); + return 0; +} + + +static int __init mips_smp_ipi_init(void) +{ + mips_smp_ipi_allocate(cpu_possible_mask); + call_desc = irq_to_desc(call_virq); sched_desc = irq_to_desc(sched_virq); |