[PATCH 1/6] irqchip: add the Alpine MSIX interrupt controller

Antoine Tenart
2016-02-08T14:17:54Z

Thomas,

On Mon, Feb 08, 2016 at 11:31:47AM +0100, Thomas Gleixner wrote:
> On Mon, 8 Feb 2016, Antoine Tenart wrote:
> > +static int alpine_msix_set_affinity(struct irq_data *irq_data,
> > + const struct cpumask *mask, bool force)
> > +{
> > + int ret;
> > +
> > + ret = irq_chip_set_affinity_parent(irq_data, mask, force);
> > + return ret == IRQ_SET_MASK_OK ? IRQ_SET_MASK_OK_DONE : ret;
>
> What's the point of this exercise? Why can't you just set the affinity
> callback to irq_chip_set_affinity_parent() ?

That's what done in irq-gic-v2m.c. Besides that, I see no point. I'll
update for v2.

> > +static struct irq_chip alpine_msix_irq_chip = {
> > + .name = "MSIx",
> > + .irq_mask = alpine_msix_mask_msi_irq,
> > + .irq_unmask = alpine_msix_unmask_msi_irq,
> > + .irq_eoi = irq_chip_eoi_parent,
> > + .irq_set_affinity = alpine_msix_set_affinity,
> > +};
> > +
> > +static int alpine_msix_allocate_sgi(struct alpine_msix_data *priv, int num_req)
> > +{
> > + int first, i;
> > +
> > + spin_lock(&priv->msi_map_lock);
> > +
> > + first = bitmap_find_next_zero_area(priv->msi_map, priv->num_spis, 0,
> > + num_req, 0);
> > + if (first >= priv->num_spis) {
> > + spin_unlock(&priv->msi_map_lock);
> > + return -ENOSPC;
> > + }
> > +
> > + for (i = 0; i < num_req; i++)
> > + set_bit(first + i, priv->msi_map);
>
> bitmap_set() ??

Indeed, that's better :)

> > + spin_unlock(&priv->msi_map_lock);
> > +
> > + return priv->spi_first + first;
> > +}
> > +
> > +static void alpine_msix_free_sgi(struct alpine_msix_data *priv, unsigned sgi,
> > + int num_req)
> > +{
> > + int i, first;
> > +
> > + first = sgi - priv->spi_first;
> > +
> > + spin_lock(&priv->msi_map_lock);
> > +
> > + for (i = 0; i < num_req; i++)
> > + clear_bit(first + i, priv->msi_map);
>
> bitmap_clear() ??

Ditto.

Antoine

--
Antoine T?nart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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