diff options
| -rw-r--r-- | arch/openrisc/include/asm/smp.h | 3 | ||||
| -rw-r--r-- | arch/openrisc/kernel/smp.c | 22 | ||||
| -rw-r--r-- | drivers/irqchip/irq-ompic.c | 15 | ||||
| -rw-r--r-- | drivers/irqchip/irq-or1k-pic.c | 27 |
4 files changed, 60 insertions, 7 deletions
diff --git a/arch/openrisc/include/asm/smp.h b/arch/openrisc/include/asm/smp.h index e21d2f12b5b6..007296f160ef 100644 --- a/arch/openrisc/include/asm/smp.h +++ b/arch/openrisc/include/asm/smp.h @@ -20,7 +20,8 @@ extern void smp_init_cpus(void); extern void arch_send_call_function_single_ipi(int cpu); extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); -extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int)); +extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int), + unsigned int irq); extern void handle_IPI(unsigned int ipi_msg); #endif /* __ASM_OPENRISC_SMP_H */ diff --git a/arch/openrisc/kernel/smp.c b/arch/openrisc/kernel/smp.c index 86da4bc5ee0b..040ca201b692 100644 --- a/arch/openrisc/kernel/smp.c +++ b/arch/openrisc/kernel/smp.c @@ -13,6 +13,7 @@ #include <linux/smp.h> #include <linux/cpu.h> +#include <linux/interrupt.h> #include <linux/sched.h> #include <linux/sched/mm.h> #include <linux/irq.h> @@ -25,6 +26,7 @@ asmlinkage __init void secondary_start_kernel(void); +static unsigned int ipi_irq __ro_after_init; static void (*smp_cross_call)(const struct cpumask *, unsigned int); unsigned long secondary_release = -1; @@ -39,6 +41,14 @@ enum ipi_msg_type { static DEFINE_SPINLOCK(boot_lock); +static void or1k_ipi_enable(void) +{ + if (WARN_ON_ONCE(!ipi_irq)) + return; + + enable_percpu_irq(ipi_irq, 0); +} + static void boot_secondary(unsigned int cpu, struct task_struct *idle) { /* @@ -136,6 +146,7 @@ asmlinkage __init void secondary_start_kernel(void) complete(&cpu_running); synchronise_count_slave(cpu); + or1k_ipi_enable(); set_cpu_online(cpu, true); local_irq_enable(); @@ -195,9 +206,18 @@ void smp_send_stop(void) smp_call_function(stop_this_cpu, NULL, 0); } -void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int)) +void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int), + unsigned int irq) { + if (WARN_ON(ipi_irq)) + return; + smp_cross_call = fn; + + ipi_irq = irq; + + /* Enabled IPIs for boot CPU immediately */ + or1k_ipi_enable(); } void arch_send_call_function_single_ipi(int cpu) diff --git a/drivers/irqchip/irq-ompic.c b/drivers/irqchip/irq-ompic.c index e66ef4373b1e..f0e0b435bb1d 100644 --- a/drivers/irqchip/irq-ompic.c +++ b/drivers/irqchip/irq-ompic.c @@ -84,6 +84,8 @@ DEFINE_PER_CPU(unsigned long, ops); static void __iomem *ompic_base; +static DEFINE_PER_CPU_READ_MOSTLY(int, ipi_dummy_dev); + static inline u32 ompic_readreg(void __iomem *base, loff_t offset) { return ioread32be(base + offset); @@ -183,12 +185,17 @@ static int __init ompic_of_init(struct device_node *node, goto out_unmap; } - ret = request_irq(irq, ompic_ipi_handler, IRQF_PERCPU, - "ompic_ipi", NULL); - if (ret) + irq_set_percpu_devid(irq); + ret = request_percpu_irq(irq, ompic_ipi_handler, "ompic_ipi", + &ipi_dummy_dev); + + if (ret) { + pr_err("ompic: failed to request irq %d, error: %d", + irq, ret); goto out_irq_disp; + } - set_smp_cross_call(ompic_raise_softirq); + set_smp_cross_call(ompic_raise_softirq, irq); return 0; diff --git a/drivers/irqchip/irq-or1k-pic.c b/drivers/irqchip/irq-or1k-pic.c index 48126067c54b..73dc99c71d40 100644 --- a/drivers/irqchip/irq-or1k-pic.c +++ b/drivers/irqchip/irq-or1k-pic.c @@ -118,11 +118,36 @@ static void or1k_pic_handle_irq(struct pt_regs *regs) generic_handle_domain_irq(root_domain, irq); } +/* + * The OR1K PIC is a cpu-local interrupt controller and does not distinguish or + * use distinct irq number ranges for per-cpu event interrupts (IPI). Since + * information to determine whether a particular irq number should be treated as + * per-cpu is not available at mapping time, we use a wrapper handler function + * which chooses the right handler at runtime based on whether IRQF_PERCPU was + * used when requesting the irq. Borrowed from J-Core AIC. + */ +static void or1k_irq_flow_handler(struct irq_desc *desc) +{ +#ifdef CONFIG_SMP + struct irq_data *data = irq_desc_get_irq_data(desc); + struct or1k_pic_dev *pic = data->domain->host_data; + + if (irqd_is_per_cpu(data)) + handle_percpu_devid_irq(desc); + else + pic->handle(desc); +#endif +} + static int or1k_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) { struct or1k_pic_dev *pic = d->host_data; - irq_set_chip_and_handler(irq, &pic->chip, pic->handle); + if (IS_ENABLED(CONFIG_SMP)) + irq_set_chip_and_handler(irq, &pic->chip, or1k_irq_flow_handler); + else + irq_set_chip_and_handler(irq, &pic->chip, pic->handle); + irq_set_status_flags(irq, pic->flags); return 0; |