The following commit has been merged into the irq/core branch of tip: Commit-ID: f02147dd02eb5fab31b55b73e7524f94b5f20324 Gitweb: https://git.kernel.org/tip/f02147dd02eb5fab31b55b73e7524f94b5f20324 Author: Marc Zyngier <maz@xxxxxxxxxx> AuthorDate: Mon, 22 Jun 2020 21:23:36 +01:00 Committer: Marc Zyngier <maz@xxxxxxxxxx> CommitterDate: Thu, 17 Sep 2020 16:37:27 +01:00 irqchip/armada-370-xp: Configure IPIs as standard interrupts To introduce IPIs as standard interrupts to the Armada 370-XP driver, let's allocate a completely separate irqdomain and irqchip combo that lives parallel to the "standard" one. This effectively should be modelled as a chained interrupt controller, but the code is in such a state that it is pretty hard to shoehorn, as it would require the rewrite of the MSI layer as well. Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> --- drivers/irqchip/irq-armada-370-xp.c | 262 ++++++++++++++++++--------- 1 file changed, 178 insertions(+), 84 deletions(-) diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c index c9bdc52..d7eb2e9 100644 --- a/drivers/irqchip/irq-armada-370-xp.c +++ b/drivers/irqchip/irq-armada-370-xp.c @@ -310,7 +310,134 @@ static inline int armada_370_xp_msi_init(struct device_node *node, } #endif +static void armada_xp_mpic_perf_init(void) +{ + unsigned long cpuid = cpu_logical_map(smp_processor_id()); + + /* Enable Performance Counter Overflow interrupts */ + writel(ARMADA_370_XP_INT_CAUSE_PERF(cpuid), + per_cpu_int_base + ARMADA_370_XP_INT_FABRIC_MASK_OFFS); +} + #ifdef CONFIG_SMP +static struct irq_domain *ipi_domain; + +static void armada_370_xp_ipi_mask(struct irq_data *d) +{ + u32 reg; + reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS); + reg &= ~BIT(d->hwirq); + writel(reg, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS); +} + +static void armada_370_xp_ipi_unmask(struct irq_data *d) +{ + u32 reg; + reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS); + reg |= BIT(d->hwirq); + writel(reg, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS); +} + +static void armada_370_xp_ipi_send_mask(struct irq_data *d, + const struct cpumask *mask) +{ + unsigned long map = 0; + int cpu; + + /* Convert our logical CPU mask into a physical one. */ + for_each_cpu(cpu, mask) + map |= 1 << cpu_logical_map(cpu); + + /* + * Ensure that stores to Normal memory are visible to the + * other CPUs before issuing the IPI. + */ + dsb(); + + /* submit softirq */ + writel((map << 8) | d->hwirq, main_int_base + + ARMADA_370_XP_SW_TRIG_INT_OFFS); +} + +static void armada_370_xp_ipi_eoi(struct irq_data *d) +{ + writel(~BIT(d->hwirq), per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS); +} + +static struct irq_chip ipi_irqchip = { + .name = "IPI", + .irq_mask = armada_370_xp_ipi_mask, + .irq_unmask = armada_370_xp_ipi_unmask, + .irq_eoi = armada_370_xp_ipi_eoi, + .ipi_send_mask = armada_370_xp_ipi_send_mask, +}; + +static int armada_370_xp_ipi_alloc(struct irq_domain *d, + unsigned int virq, + unsigned int nr_irqs, void *args) +{ + int i; + + for (i = 0; i < nr_irqs; i++) { + irq_set_percpu_devid(virq + i); + irq_domain_set_info(d, virq + i, i, &ipi_irqchip, + d->host_data, + handle_percpu_devid_fasteoi_ipi, + NULL, NULL); + } + + return 0; +} + +static void armada_370_xp_ipi_free(struct irq_domain *d, + unsigned int virq, + unsigned int nr_irqs) +{ + /* Not freeing IPIs */ +} + +static const struct irq_domain_ops ipi_domain_ops = { + .alloc = armada_370_xp_ipi_alloc, + .free = armada_370_xp_ipi_free, +}; + +static void ipi_resume(void) +{ + int i; + + for (i = 0; i < IPI_DOORBELL_END; i++) { + int irq; + + irq = irq_find_mapping(ipi_domain, i); + if (irq <= 0) + continue; + if (irq_percpu_is_enabled(irq)) { + struct irq_data *d; + d = irq_domain_get_irq_data(ipi_domain, irq); + armada_370_xp_ipi_unmask(d); + } + } +} + +static __init void armada_xp_ipi_init(struct device_node *node) +{ + int base_ipi; + + ipi_domain = irq_domain_create_linear(of_node_to_fwnode(node), + IPI_DOORBELL_END, + &ipi_domain_ops, NULL); + if (WARN_ON(!ipi_domain)) + return; + + irq_domain_update_bus_token(ipi_domain, DOMAIN_BUS_IPI); + base_ipi = __irq_domain_alloc_irqs(ipi_domain, -1, IPI_DOORBELL_END, + NUMA_NO_NODE, NULL, false, NULL); + if (WARN_ON(!base_ipi)) + return; + + set_smp_ipi_range(base_ipi, IPI_DOORBELL_END); +} + static DEFINE_RAW_SPINLOCK(irq_controller_lock); static int armada_xp_set_affinity(struct irq_data *d, @@ -334,43 +461,6 @@ static int armada_xp_set_affinity(struct irq_data *d, return IRQ_SET_MASK_OK; } -#endif - -static struct irq_chip armada_370_xp_irq_chip = { - .name = "MPIC", - .irq_mask = armada_370_xp_irq_mask, - .irq_mask_ack = armada_370_xp_irq_mask, - .irq_unmask = armada_370_xp_irq_unmask, -#ifdef CONFIG_SMP - .irq_set_affinity = armada_xp_set_affinity, -#endif - .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND, -}; - -static int armada_370_xp_mpic_irq_map(struct irq_domain *h, - unsigned int virq, irq_hw_number_t hw) -{ - armada_370_xp_irq_mask(irq_get_irq_data(virq)); - if (!is_percpu_irq(hw)) - writel(hw, per_cpu_int_base + - ARMADA_370_XP_INT_CLEAR_MASK_OFFS); - else - writel(hw, main_int_base + ARMADA_370_XP_INT_SET_ENABLE_OFFS); - irq_set_status_flags(virq, IRQ_LEVEL); - - if (is_percpu_irq(hw)) { - irq_set_percpu_devid(virq); - irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip, - handle_percpu_devid_irq); - } else { - irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip, - handle_level_irq); - irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq))); - } - irq_set_probe(virq); - - return 0; -} static void armada_xp_mpic_smp_cpu_init(void) { @@ -383,48 +473,16 @@ static void armada_xp_mpic_smp_cpu_init(void) for (i = 0; i < nr_irqs; i++) writel(i, per_cpu_int_base + ARMADA_370_XP_INT_SET_MASK_OFFS); + /* Disable all IPIs */ + writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS); + /* Clear pending IPIs */ writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS); - /* Enable first 8 IPIs */ - writel(IPI_DOORBELL_MASK, per_cpu_int_base + - ARMADA_370_XP_IN_DRBEL_MSK_OFFS); - /* Unmask IPI interrupt */ writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS); } -static void armada_xp_mpic_perf_init(void) -{ - unsigned long cpuid = cpu_logical_map(smp_processor_id()); - - /* Enable Performance Counter Overflow interrupts */ - writel(ARMADA_370_XP_INT_CAUSE_PERF(cpuid), - per_cpu_int_base + ARMADA_370_XP_INT_FABRIC_MASK_OFFS); -} - -#ifdef CONFIG_SMP -static void armada_mpic_send_doorbell(const struct cpumask *mask, - unsigned int irq) -{ - int cpu; - unsigned long map = 0; - - /* Convert our logical CPU mask into a physical one. */ - for_each_cpu(cpu, mask) - map |= 1 << cpu_logical_map(cpu); - - /* - * Ensure that stores to Normal memory are visible to the - * other CPUs before issuing the IPI. - */ - dsb(); - - /* submit softirq */ - writel((map << 8) | irq, main_int_base + - ARMADA_370_XP_SW_TRIG_INT_OFFS); -} - static void armada_xp_mpic_reenable_percpu(void) { unsigned int irq; @@ -445,6 +503,8 @@ static void armada_xp_mpic_reenable_percpu(void) armada_370_xp_irq_unmask(data); } + + ipi_resume(); } static int armada_xp_mpic_starting_cpu(unsigned int cpu) @@ -462,7 +522,46 @@ static int mpic_cascaded_starting_cpu(unsigned int cpu) enable_percpu_irq(parent_irq, IRQ_TYPE_NONE); return 0; } +#else +static void armada_xp_mpic_smp_cpu_init(void) {} +static void ipi_resume(void) {} +#endif + +static struct irq_chip armada_370_xp_irq_chip = { + .name = "MPIC", + .irq_mask = armada_370_xp_irq_mask, + .irq_mask_ack = armada_370_xp_irq_mask, + .irq_unmask = armada_370_xp_irq_unmask, +#ifdef CONFIG_SMP + .irq_set_affinity = armada_xp_set_affinity, #endif + .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND, +}; + +static int armada_370_xp_mpic_irq_map(struct irq_domain *h, + unsigned int virq, irq_hw_number_t hw) +{ + armada_370_xp_irq_mask(irq_get_irq_data(virq)); + if (!is_percpu_irq(hw)) + writel(hw, per_cpu_int_base + + ARMADA_370_XP_INT_CLEAR_MASK_OFFS); + else + writel(hw, main_int_base + ARMADA_370_XP_INT_SET_ENABLE_OFFS); + irq_set_status_flags(virq, IRQ_LEVEL); + + if (is_percpu_irq(hw)) { + irq_set_percpu_devid(virq); + irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip, + handle_percpu_devid_irq); + } else { + irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip, + handle_level_irq); + irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq))); + } + irq_set_probe(virq); + + return 0; +} static const struct irq_domain_ops armada_370_xp_mpic_irq_ops = { .map = armada_370_xp_mpic_irq_map, @@ -562,22 +661,15 @@ armada_370_xp_handle_irq(struct pt_regs *regs) #ifdef CONFIG_SMP /* IPI Handling */ if (irqnr == 0) { - u32 ipimask, ipinr; + unsigned long ipimask; + int ipi; ipimask = readl_relaxed(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS) & IPI_DOORBELL_MASK; - writel(~ipimask, per_cpu_int_base + - ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS); - - /* Handle all pending doorbells */ - for (ipinr = IPI_DOORBELL_START; - ipinr < IPI_DOORBELL_END; ipinr++) { - if (ipimask & (0x1 << ipinr)) - handle_IPI(ipinr, regs); - } - continue; + for_each_set_bit(ipi, &ipimask, IPI_DOORBELL_END) + handle_domain_irq(ipi_domain, ipi, regs); } #endif @@ -636,6 +728,8 @@ static void armada_370_xp_mpic_resume(void) writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS); if (doorbell_mask_reg & PCI_MSI_DOORBELL_MASK) writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS); + + ipi_resume(); } static struct syscore_ops armada_370_xp_mpic_syscore_ops = { @@ -691,7 +785,7 @@ static int __init armada_370_xp_mpic_of_init(struct device_node *node, irq_set_default_host(armada_370_xp_mpic_domain); set_handle_irq(armada_370_xp_handle_irq); #ifdef CONFIG_SMP - set_smp_cross_call(armada_mpic_send_doorbell); + armada_xp_ipi_init(node); cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_XP_STARTING, "irqchip/armada/ipi:starting", armada_xp_mpic_starting_cpu, NULL);
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