linux-kernel - Re: [RESEND PATCH 4.0-rc5 v19 3/6] irqchip: gic: Introduce plumbing for IPI FIQ

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Date:	Wed, 08 Apr 2015 16:19:58 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Daniel Thompson'" <daniel.thompson@...aro.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	"'Russell King'" <linux@....linux.org.uk>
Subject: Re: [RESEND PATCH 4.0-rc5 v19 3/6] irqchip: gic: Introduce plumbing for IPI FIQ

> +/*
> + * Fully acknowledge (both ack and eoi) any outstanding FIQ-based IPI,
> + * otherwise do nothing.
> + */
> +void gic_handle_fiq_ipi(void)
> +{
> +	struct gic_chip_data *gic = &gic_data[0];
> +	void __iomem *cpu_base = gic_data_cpu_base(gic);
> +	unsigned long irqstat, irqnr;
> +
> +	if (WARN_ON(!in_nmi()))
> +		return;
> +
> +	while ((1u << readl_relaxed(cpu_base + GIC_CPU_HIGHPRI)) &
> +	       SMP_IPI_FIQ_MASK) {
> +		irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
> +		writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
> +
> +		irqnr = irqstat & GICC_IAR_INT_ID_MASK;
> +		WARN_RATELIMIT(irqnr > 16,
> +			       "Unexpected irqnr %lu (bad prioritization?)\n",

Help more if s/Unexpected/Unexpected FIQ/ ?

> +			       irqnr);
> +	}
> +}
> +

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