From f37a53cc5d8a8fb199e41386d125d8c2ed9e54ef Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Fri, 21 Oct 2011 17:14:27 -0500 Subject: [PATCH] ARM: gic: fix irq_alloc_descs handling for sparse irq Commit "ARM: gic: add irq_domain support" (b49b6ff) breaks SPARSE_IRQ on platforms with GIC. When SPARSE_IRQ is enabled, all NR_IRQS or mach_desc->nr_irqs will be allocated by arch_probe_nr_irqs(). This caused irq_alloc_descs to allocate irq_descs after the pre-allocated space. Make irq_alloc_descs search for an exact irq range and assume it has been pre-allocated on failure. For DT probing dynamic allocation is used. DT enabled platforms should set their nr_irqs to NR_IRQ_LEGACY and have all irq_chips allocate their irq_descs with irq_alloc_descs if SPARSE_IRQ is enabled. gic_init irq_start param is changed to be signed with negative meaning do dynamic Linux irq assigment. Signed-off-by: Rob Herring --- arch/arm/common/gic.c | 15 +++++++++++---- arch/arm/include/asm/hardware/gic.h | 2 +- 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c index 1333e68b1f9..9d77777076f 100644 --- a/arch/arm/common/gic.c +++ b/arch/arm/common/gic.c @@ -24,6 +24,7 @@ */ #include #include +#include #include #include #include @@ -562,7 +563,7 @@ const struct irq_domain_ops gic_irq_domain_ops = { #endif }; -void __init gic_init(unsigned int gic_nr, unsigned int irq_start, +void __init gic_init(unsigned int gic_nr, int irq_start, void __iomem *dist_base, void __iomem *cpu_base) { struct gic_chip_data *gic; @@ -583,7 +584,8 @@ void __init gic_init(unsigned int gic_nr, unsigned int irq_start, if (gic_nr == 0) { gic_cpu_base_addr = cpu_base; domain->hwirq_base = 16; - irq_start = (irq_start & ~31) + 16; + if (irq_start > 0) + irq_start = (irq_start & ~31) + 16; } else domain->hwirq_base = 32; @@ -598,8 +600,13 @@ void __init gic_init(unsigned int gic_nr, unsigned int irq_start, gic->gic_irqs = gic_irqs; domain->nr_irq = gic_irqs - domain->hwirq_base; - domain->irq_base = irq_alloc_descs(-1, irq_start, domain->nr_irq, + domain->irq_base = irq_alloc_descs(irq_start, 16, domain->nr_irq, numa_node_id()); + if (IS_ERR_VALUE(domain->irq_base)) { + WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", + irq_start); + domain->irq_base = irq_start; + } domain->priv = gic; domain->ops = &gic_irq_domain_ops; irq_domain_add(domain); @@ -659,7 +666,7 @@ int __init gic_of_init(struct device_node *node, struct device_node *parent) domain->of_node = of_node_get(node); - gic_init(gic_cnt, 16, dist_base, cpu_base); + gic_init(gic_cnt, -1, dist_base, cpu_base); if (parent) { irq = irq_of_parse_and_map(node, 0); diff --git a/arch/arm/include/asm/hardware/gic.h b/arch/arm/include/asm/hardware/gic.h index 0a026b9290f..3e91f22046f 100644 --- a/arch/arm/include/asm/hardware/gic.h +++ b/arch/arm/include/asm/hardware/gic.h @@ -39,7 +39,7 @@ struct device_node; extern void __iomem *gic_cpu_base_addr; extern struct irq_chip gic_arch_extn; -void gic_init(unsigned int, unsigned int, void __iomem *, void __iomem *); +void gic_init(unsigned int, int, void __iomem *, void __iomem *); int gic_of_init(struct device_node *node, struct device_node *parent); void gic_secondary_init(unsigned int); void gic_cascade_irq(unsigned int gic_nr, unsigned int irq); -- 2.39.5