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

[Anup Patel]

On Sat, Feb 17, 2024 at 2:34 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> 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//

Okay, I will update.

>
> > +
> > +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()

Okay, I will update.

>
> > +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.

Okay, I will add a comment about the condition.

Regards,
Anup