On Monday, July 21, 2014 at 04:47:12 PM, Daniel Thompson wrote: > All GIC hardware except GICv1-without-TrustZone support provides a means > to group exceptions into group 0 (which can optionally be signally using > use FIQ) and group 1. The kernel currently provides no means to exploit > this. This patch alters the initialization of the GIC to place all > interrupts into group 1 which is the foundational requirement to > meaningfully use FIQ.
[...] > @@ -670,7 +753,11 @@ static void gic_raise_softirq(const struct cpumask > *mask, unsigned int irq) dmb(ishst); > > /* this always happens on GIC0 */ > - writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + > GIC_DIST_SOFTINT); + softint = map << 16 | irq; > + if (gic_data_fiq_enable(&gic_data[0])) > + softint |= 0x8000; These magic bits here could use some clarification, possibly a comment. > + writel_relaxed(softint, > + gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); > > raw_spin_unlock_irqrestore(&irq_controller_lock, flags); > } [...] Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
