Stephen Warren <swarren@xxxxxxxxxxxxx> writes: > On 07/07/2015 03:13 PM, Eric Anholt wrote: >> This interrupt controller is the new root interrupt controller with >> the timer, PMU events, and IPIs, and the bcm2835's interrupt >> controller is chained off of it to handle the peripherals. >> >> SMP IPI support was mostly written by Andrea Merello, while I wrote >> most of the rest of the IRQ handling. >> >> Signed-off-by: Andrea Merello <andrea.merello@xxxxxxxxx> >> Signed-off-by: Eric Anholt <eric@xxxxxxxxxx> > > I'd expect the git patch author to be Andrea if he wrote the original > patch and you enhanced it. I wrote the IRQs patch, and Andrea added the IPI bits to it. >> diff --git a/drivers/irqchip/irq-bcm2836.c b/drivers/irqchip/irq-bcm2836.c > >> +struct arm_local_intc { >> + struct irq_domain *domain; >> + void __iomem *base; >> +}; >> + >> +static struct arm_local_intc intc __read_mostly; > > It'd be nice to give everything (types, functions, variables) a > consistent symbol prefix; bcm2836_arm_irqchip_ sounds like a good > bikeshed to me, but perhaps just propagating the above arm_local_ to the > functions too would be good, although that seems to risk symbol name > collisions with other ARM SoCs. Done. >> +static void bcm2836_mask_gpu_irq(struct irq_data *d) >> +{ >> +} >> + >> +static void bcm2836_unmask_gpu_irq(struct irq_data *d) >> +{ >> +} > > If the IRQs can't be masked, should these functions actually be implemented? They are called unconditionally at IRQ enable time. I don't see a way to mask them. >> +static void __exception_irq_entry bcm2836_handle_irq(struct pt_regs *regs) >> +{ >> + int cpu = smp_processor_id(); >> + u32 stat; >> + >> + stat = readl_relaxed(intc.base + LOCAL_IRQ_PENDING0 + 4 * cpu); >> + if (stat & 0x10) { >> + void __iomem *mailbox0 = (intc.base + >> + LOCAL_MAILBOX0_CLR0 + 16 * cpu); >> + u32 mbox_val = readl(mailbox0); >> + u32 ipi = ffs(mbox_val) - 1; >> + >> + writel(1 << ipi, mailbox0); >> + handle_IPI(ipi, regs); > > Given that bcm2836_send_ipi() is #ifdef CONFIG_SMP, should this code be too? Sure, done.
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