Re: [PATCH v12 23/25] irqchip/riscv-aplic: Add support for MSI-mode

[Thomas Gleixner]

On Sat, Jan 27 2024 at 21:47, Anup Patel wrote:
> We extend the existing APLIC irqchip driver to support MSI-mode for
> RISC-V platforms having both wired interrupts and MSIs.

We? Just s/We//

> +
> +static void aplic_msi_irq_unmask(struct irq_data *d)
> +{
> +	aplic_irq_unmask(d);
> +	irq_chip_unmask_parent(d);
> +}
> +
> +static void aplic_msi_irq_mask(struct irq_data *d)
> +{
> +	aplic_irq_mask(d);
> +	irq_chip_mask_parent(d);
> +}

Again asymmetric vs. unmask()

> +static void aplic_msi_irq_eoi(struct irq_data *d)
> +{
> +	struct aplic_priv *priv = irq_data_get_irq_chip_data(d);
> +	u32 reg_off, reg_mask;
> +
> +	/*
> +	 * EOI handling only required only for level-triggered
> +	 * interrupts in APLIC MSI mode.
> +	 */
> +
> +	reg_off = APLIC_CLRIP_BASE + ((d->hwirq / APLIC_IRQBITS_PER_REG) * 4);
> +	reg_mask = BIT(d->hwirq % APLIC_IRQBITS_PER_REG);
> +	switch (irqd_get_trigger_type(d)) {
> +	case IRQ_TYPE_LEVEL_LOW:
> +		if (!(readl(priv->regs + reg_off) & reg_mask))
> +			writel(d->hwirq, priv->regs + APLIC_SETIPNUM_LE);

A comment what this condition is for would be nice.

Thanks,

        tglx