Commit-ID: 2af70a962070fd2e6f3b1a259b652faa3fd1a122 Gitweb: http://git.kernel.org/tip/2af70a962070fd2e6f3b1a259b652faa3fd1a122 Author: Qais Yousef <qais.yousef@xxxxxxxxxx> AuthorDate: Tue, 8 Dec 2015 13:20:23 +0000 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Thu, 25 Feb 2016 10:56:57 +0100 irqchip/mips-gic: Add a IPI hierarchy domain Add a new ipi domain on top of the normal domain. MIPS GIC now supports dynamic allocation of an IPI. Signed-off-by: Qais Yousef <qais.yousef@xxxxxxxxxx> Acked-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Cc: <jason@xxxxxxxxxxxxxx> Cc: <marc.zyngier@xxxxxxx> Cc: <jiang.liu@xxxxxxxxxxxxxxx> Cc: <linux-mips@xxxxxxxxxxxxxx> Cc: <lisa.parratt@xxxxxxxxxx> Cc: Qais Yousef <qsyousef@xxxxxxxxx> Link: http://lkml.kernel.org/r/1449580830-23652-13-git-send-email-qais.yousef@xxxxxxxxxx Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> --- drivers/irqchip/Kconfig | 1 + drivers/irqchip/irq-mips-gic.c | 184 +++++++++++++++++++++++++++++++++++++++-- 2 files changed, 180 insertions(+), 5 deletions(-) diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 0ffbdfd..71e648a 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -209,6 +209,7 @@ config KEYSTONE_IRQ config MIPS_GIC bool + select IRQ_DOMAIN_HIERARCHY select MIPS_CM config INGENIC_IRQ diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c index 9e17ef2..99f01ca 100644 --- a/drivers/irqchip/irq-mips-gic.c +++ b/drivers/irqchip/irq-mips-gic.c @@ -29,16 +29,31 @@ struct gic_pcpu_mask { DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS); }; +struct gic_irq_spec { + enum { + GIC_DEVICE, + GIC_IPI + } type; + + union { + struct cpumask *ipimask; + unsigned int hwirq; + }; +}; + static unsigned long __gic_base_addr; + static void __iomem *gic_base; static struct gic_pcpu_mask pcpu_masks[NR_CPUS]; static DEFINE_SPINLOCK(gic_lock); static struct irq_domain *gic_irq_domain; +static struct irq_domain *gic_ipi_domain; static int gic_shared_intrs; static int gic_vpes; static unsigned int gic_cpu_pin; static unsigned int timer_cpu_pin; static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller; +DECLARE_BITMAP(ipi_resrv, GIC_MAX_INTRS); static void __gic_irq_dispatch(void); @@ -753,7 +768,7 @@ static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq, } static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq, - irq_hw_number_t hw) + irq_hw_number_t hw, unsigned int vpe) { int intr = GIC_HWIRQ_TO_SHARED(hw); unsigned long flags; @@ -763,9 +778,8 @@ static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq, spin_lock_irqsave(&gic_lock, flags); gic_map_to_pin(intr, gic_cpu_pin); - /* Map to VPE 0 by default */ - gic_map_to_vpe(intr, 0); - set_bit(intr, pcpu_masks[0].pcpu_mask); + gic_map_to_vpe(intr, vpe); + set_bit(intr, pcpu_masks[vpe].pcpu_mask); spin_unlock_irqrestore(&gic_lock, flags); return 0; @@ -776,7 +790,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq, { if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS) return gic_local_irq_domain_map(d, virq, hw); - return gic_shared_irq_domain_map(d, virq, hw); + return gic_shared_irq_domain_map(d, virq, hw, 0); } static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, @@ -798,9 +812,157 @@ static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, return 0; } +static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs, void *arg) +{ + struct gic_irq_spec *spec = arg; + irq_hw_number_t hwirq, base_hwirq; + int cpu, ret, i; + + if (spec->type == GIC_DEVICE) { + /* verify that it doesn't conflict with an IPI irq */ + if (test_bit(spec->hwirq, ipi_resrv)) + return -EBUSY; + } else { + base_hwirq = find_first_bit(ipi_resrv, gic_shared_intrs); + if (base_hwirq == gic_shared_intrs) { + return -ENOMEM; + } + + /* check that we have enough space */ + for (i = base_hwirq; i < nr_irqs; i++) { + if (!test_bit(i, ipi_resrv)) + return -EBUSY; + } + bitmap_clear(ipi_resrv, base_hwirq, nr_irqs); + + /* map the hwirq for each cpu consecutively */ + i = 0; + for_each_cpu(cpu, spec->ipimask) { + hwirq = GIC_SHARED_TO_HWIRQ(base_hwirq + i); + + ret = irq_domain_set_hwirq_and_chip(d, virq + i, hwirq, + &gic_edge_irq_controller, + NULL); + if (ret) + goto error; + + ret = gic_shared_irq_domain_map(d, virq + i, hwirq, cpu); + if (ret) + goto error; + + i++; + } + + /* + * tell the parent about the base hwirq we allocated so it can + * set its own domain data + */ + spec->hwirq = base_hwirq; + } + + return 0; +error: + bitmap_set(ipi_resrv, base_hwirq, nr_irqs); + return ret; +} + +void gic_irq_domain_free(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs) +{ + irq_hw_number_t base_hwirq; + struct irq_data *data; + + data = irq_get_irq_data(virq); + if (!data) + return; + + base_hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(data)); + bitmap_set(ipi_resrv, base_hwirq, nr_irqs); +} + static const struct irq_domain_ops gic_irq_domain_ops = { .map = gic_irq_domain_map, .xlate = gic_irq_domain_xlate, + .alloc = gic_irq_domain_alloc, + .free = gic_irq_domain_free, +}; + +static int gic_ipi_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, + const u32 *intspec, unsigned int intsize, + irq_hw_number_t *out_hwirq, + unsigned int *out_type) +{ + /* + * There's nothing to translate here. hwirq is dynamically allocated and + * the irq type is always edge triggered. + * */ + *out_hwirq = 0; + *out_type = IRQ_TYPE_EDGE_RISING; + + return 0; +} + +static int gic_ipi_domain_alloc(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs, void *arg) +{ + struct cpumask *ipimask = arg; + struct gic_irq_spec spec = { + .type = GIC_IPI, + .ipimask = ipimask + }; + int ret, i; + + ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &spec); + if (ret) + return ret; + + /* the parent should have set spec.hwirq to the base_hwirq it allocated */ + for (i = 0; i < nr_irqs; i++) { + ret = irq_domain_set_hwirq_and_chip(d, virq + i, + GIC_SHARED_TO_HWIRQ(spec.hwirq + i), + &gic_edge_irq_controller, + NULL); + if (ret) + goto error; + + ret = irq_set_irq_type(virq + i, IRQ_TYPE_EDGE_RISING); + if (ret) + goto error; + } + + return 0; +error: + irq_domain_free_irqs_parent(d, virq, nr_irqs); + return ret; +} + +void gic_ipi_domain_free(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs) +{ + irq_domain_free_irqs_parent(d, virq, nr_irqs); +} + +int gic_ipi_domain_match(struct irq_domain *d, struct device_node *node, + enum irq_domain_bus_token bus_token) +{ + bool is_ipi; + + switch (bus_token) { + case DOMAIN_BUS_IPI: + is_ipi = d->bus_token == bus_token; + return to_of_node(d->fwnode) == node && is_ipi; + break; + default: + return 0; + } +} + +static struct irq_domain_ops gic_ipi_domain_ops = { + .xlate = gic_ipi_domain_xlate, + .alloc = gic_ipi_domain_alloc, + .free = gic_ipi_domain_free, + .match = gic_ipi_domain_match, }; static void __init __gic_init(unsigned long gic_base_addr, @@ -864,6 +1026,18 @@ static void __init __gic_init(unsigned long gic_base_addr, if (!gic_irq_domain) panic("Failed to add GIC IRQ domain"); + gic_ipi_domain = irq_domain_add_hierarchy(gic_irq_domain, + IRQ_DOMAIN_FLAG_IPI_PER_CPU, + GIC_NUM_LOCAL_INTRS + gic_shared_intrs, + node, &gic_ipi_domain_ops, NULL); + if (!gic_ipi_domain) + panic("Failed to add GIC IPI domain"); + + gic_ipi_domain->bus_token = DOMAIN_BUS_IPI; + + /* Make the last 2 * NR_CPUS available for IPIs */ + bitmap_set(ipi_resrv, gic_shared_intrs - 2 * NR_CPUS, 2 * NR_CPUS); + gic_basic_init(); gic_ipi_init();
