linux-kernel - Re: [PATCH v2 1/2] genirq: add an irq_create_mapping

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Message-ID: <20201125134538.71895275@bahia.lan>
Date:   Wed, 25 Nov 2020 13:45:38 +0100
From:   Greg Kurz <groug@...d.org>
To:     Laurent Vivier <lvivier@...hat.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>,
        "Paul Mackerras" <paulus@...ba.org>, <linux-pci@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v2 1/2] genirq: add an irq_create_mapping_affinity()
 function

On Wed, 25 Nov 2020 12:16:56 +0100
Laurent Vivier <lvivier@...hat.com> wrote:

> This function adds an affinity parameter to irq_create_mapping().
> This parameter is needed to pass it to irq_domain_alloc_descs().
> 
> irq_create_mapping() is a wrapper around irq_create_mapping_affinity()
> to pass NULL for the affinity parameter.
> 
> No functional change.
> 
> Signed-off-by: Laurent Vivier <lvivier@...hat.com>
> ---

Reviewed-by: Greg Kurz <groug@...d.org>

>  include/linux/irqdomain.h | 12 ++++++++++--
>  kernel/irq/irqdomain.c    | 13 ++++++++-----
>  2 files changed, 18 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
> index 71535e87109f..ea5a337e0f8b 100644
> --- a/include/linux/irqdomain.h
> +++ b/include/linux/irqdomain.h
> @@ -384,11 +384,19 @@ extern void irq_domain_associate_many(struct irq_domain *domain,
>  extern void irq_domain_disassociate(struct irq_domain *domain,
>  				    unsigned int irq);
>  
> -extern unsigned int irq_create_mapping(struct irq_domain *host,
> -				       irq_hw_number_t hwirq);
> +extern unsigned int irq_create_mapping_affinity(struct irq_domain *host,
> +				      irq_hw_number_t hwirq,
> +				      const struct irq_affinity_desc *affinity);
>  extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
>  extern void irq_dispose_mapping(unsigned int virq);
>  
> +static inline unsigned int irq_create_mapping(struct irq_domain *host,
> +					      irq_hw_number_t hwirq)
> +{
> +	return irq_create_mapping_affinity(host, hwirq, NULL);
> +}
> +
> +
>  /**
>   * irq_linear_revmap() - Find a linux irq from a hw irq number.
>   * @domain: domain owning this hardware interrupt
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index cf8b374b892d..e4ca69608f3b 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -624,17 +624,19 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain)
>  EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
>  
>  /**
> - * irq_create_mapping() - Map a hardware interrupt into linux irq space
> + * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
>   * @domain: domain owning this hardware interrupt or NULL for default domain
>   * @hwirq: hardware irq number in that domain space
> + * @affinity: irq affinity
>   *
>   * Only one mapping per hardware interrupt is permitted. Returns a linux
>   * irq number.
>   * If the sense/trigger is to be specified, set_irq_type() should be called
>   * on the number returned from that call.
>   */
> -unsigned int irq_create_mapping(struct irq_domain *domain,
> -				irq_hw_number_t hwirq)
> +unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
> +				       irq_hw_number_t hwirq,
> +				       const struct irq_affinity_desc *affinity)
>  {
>  	struct device_node *of_node;
>  	int virq;
> @@ -660,7 +662,8 @@ unsigned int irq_create_mapping(struct irq_domain *domain,
>  	}
>  
>  	/* Allocate a virtual interrupt number */
> -	virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), NULL);
> +	virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
> +				      affinity);
>  	if (virq <= 0) {
>  		pr_debug("-> virq allocation failed\n");
>  		return 0;
> @@ -676,7 +679,7 @@ unsigned int irq_create_mapping(struct irq_domain *domain,
>  
>  	return virq;
>  }
> -EXPORT_SYMBOL_GPL(irq_create_mapping);
> +EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
>  
>  /**
>   * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs