From 63b746b19fa660737df603f97fd5f435c511d1b5 Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Tue, 31 Oct 2017 09:41:44 -0700 Subject: [PATCH] irqchip: mips-gic: Inline gic_local_irq_domain_map() The gic_local_irq_domain_map() function has only one callsite in gic_irq_domain_map(), and the split between the two functions makes it unclear that they duplicate calculations & checks. Inline gic_local_irq_domain_map() into gic_irq_domain_map() in order to clean this up. Doing this makes the following small issues obvious, and the patch tidies them up: - Both functions used GIC_HWIRQ_TO_LOCAL() to convert a hwirq number to a local IRQ number. We now only do this once. Although the compiler ought to have optimised this away before anyway, the change leaves us with less duplicate code. - gic_local_irq_domain_map() had a check for invalid local interrupt numbers (intr > GIC_LOCAL_INT_FDC). This condition can never occur because any hwirq higher than those used for local interrupts is a shared interrupt, which gic_irq_domain_map() already handles separately. We therefore remove this check. - The decision of whether to map the interrupt to gic_cpu_pin or timer_cpu_pin can be handled within the existing switch statement in gic_irq_domain_map(), shortening the code a little. The change additionally prepares us nicely for the following patch of the series which would otherwise need to duplicate the check for whether a local interrupt should be percpu_devid or just percpu (ie. the switch statement from gic_irq_domain_map()) in gic_local_irq_domain_map(). Signed-off-by: Paul Burton Cc: Jason Cooper Cc: Marc Zyngier Cc: Thomas Gleixner Cc: linux-mips@linux-mips.org Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-mips-gic.c | 58 +++++++++++++--------------------- 1 file changed, 22 insertions(+), 36 deletions(-) diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c index c90976d7e53c..6fdcc1552fab 100644 --- a/drivers/irqchip/irq-mips-gic.c +++ b/drivers/irqchip/irq-mips-gic.c @@ -382,39 +382,6 @@ static void gic_irq_dispatch(struct irq_desc *desc) gic_handle_shared_int(true); } -static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq, - irq_hw_number_t hw) -{ - int intr = GIC_HWIRQ_TO_LOCAL(hw); - int i; - unsigned long flags; - u32 val; - - if (!gic_local_irq_is_routable(intr)) - return -EPERM; - - if (intr > GIC_LOCAL_INT_FDC) { - pr_err("Invalid local IRQ %d\n", intr); - return -EINVAL; - } - - if (intr == GIC_LOCAL_INT_TIMER) { - /* CONFIG_MIPS_CMP workaround (see __gic_init) */ - val = GIC_MAP_PIN_MAP_TO_PIN | timer_cpu_pin; - } else { - val = GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin; - } - - spin_lock_irqsave(&gic_lock, flags); - for (i = 0; i < gic_vpes; i++) { - write_gic_vl_other(mips_cm_vp_id(i)); - write_gic_vo_map(intr, val); - } - spin_unlock_irqrestore(&gic_lock, flags); - - return 0; -} - static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw, unsigned int cpu) { @@ -457,7 +424,10 @@ static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t hwirq) { - int err; + unsigned long flags; + unsigned int intr; + int err, i; + u32 map; if (hwirq >= GIC_SHARED_HWIRQ_BASE) { /* verify that shared irqs don't conflict with an IPI irq */ @@ -474,8 +444,14 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq, return gic_shared_irq_domain_map(d, virq, hwirq, 0); } - switch (GIC_HWIRQ_TO_LOCAL(hwirq)) { + intr = GIC_HWIRQ_TO_LOCAL(hwirq); + map = GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin; + + switch (intr) { case GIC_LOCAL_INT_TIMER: + /* CONFIG_MIPS_CMP workaround (see __gic_init) */ + map = GIC_MAP_PIN_MAP_TO_PIN | timer_cpu_pin; + /* fall-through */ case GIC_LOCAL_INT_PERFCTR: case GIC_LOCAL_INT_FDC: /* @@ -504,7 +480,17 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq, break; } - return gic_local_irq_domain_map(d, virq, hwirq); + if (!gic_local_irq_is_routable(intr)) + return -EPERM; + + spin_lock_irqsave(&gic_lock, flags); + for (i = 0; i < gic_vpes; i++) { + write_gic_vl_other(mips_cm_vp_id(i)); + write_gic_vo_map(intr, map); + } + spin_unlock_irqrestore(&gic_lock, flags); + + return 0; } static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq,