linux-kernel - Re: [PATCH v8 4/6] pci: altera: Add Altera PCIe MSI driver

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Message-ID: <E7E66AD1AD65064486AD57C361DF091C05B2C950@PG-ITEXCH01.altera.priv.altera.com>
Date:	Mon, 12 Oct 2015 01:55:36 +0000
From:	Ley Foon Tan <lftan@...era.com>
To:	Corentin LABBE <clabbe.montjoie@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v8 4/6] pci: altera: Add Altera PCIe MSI driver

On Kha, 2015-10-08 at 22:05 +0200, Corentin LABBE wrote:
> > This patch adds Altera PCIe MSI driver. This soft IP supports configurable
> > number of vectors, which is a dts parameter.
> >
> > Signed-off-by: Ley Foon Tan <lftan@...era.com>
> > Reviewed-by: Marc Zyngier <marc.zyngier@....com>
> > +
> > +static inline void msi_writel(struct altera_msi *msi, u32 value, u32 reg)
> > +{
> > +   writel_relaxed(value, msi->csr_base + reg);
> > +}
> > +
> > +static inline u32 msi_readl(struct altera_msi *msi, u32 reg)
> > +{
> > +   return readl_relaxed(msi->csr_base + reg);
> > +}
> > +
>
> You could set value and reg parameter as const
Noted.

>
> > +
> > +static int altera_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
> > +                              unsigned int nr_irqs, void *args)
> > +{
> > +   struct altera_msi *msi = domain->host_data;
> > +   unsigned long bit;
> > +   u32 mask;
> > +
> > +   WARN_ON(nr_irqs != 1);
> > +   mutex_lock(&msi->lock);
> > +
> > +   bit = find_first_zero_bit(msi->used, msi->num_of_vectors);
> > +   if (bit >= msi->num_of_vectors)
> > +           return -ENOSPC;
> > +
> > +   set_bit(bit, msi->used);
> > +
> > +   mutex_unlock(&msi->lock);
> > +
> > +   irq_domain_set_info(domain, virq, bit, &altera_msi_bottom_irq_chip,
> > +                       domain->host_data, handle_simple_irq,
> > +                       NULL, NULL);
> > +
> > +   mask = msi_readl(msi, MSI_INTMASK);
> > +   mask |= 1 << bit;
> > +   msi_writel(msi, mask, MSI_INTMASK);
> > +
> > +   return 0;
> > +}
>
> You do not unlock the mutex when returning -ENOSPC
> And again some parameter could be set as const
Good catch, will fix that.
Do you mean add the const for altera_irq_domain_alloc()?
It is defined by the struct irq_domain_ops.

Regards
Ley Foon


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