From mboxrd@z Thu Jan 1 00:00:00 1970 From: antoine.tenart@free-electrons.com (Antoine Tenart) Date: Mon, 8 Feb 2016 15:17:54 +0100 Subject: [PATCH 1/6] irqchip: add the Alpine MSIX interrupt controller In-Reply-To: References: <1454922971-17405-1-git-send-email-antoine.tenart@free-electrons.com> <1454922971-17405-2-git-send-email-antoine.tenart@free-electrons.com> Message-ID: <20160208141754.GG4117@kwain> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: