linux-kernel - Re: [RFC part2 PATCH 7/9] irqdomain: Add a new API irq_create_acpi

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Date:	Tue, 3 Dec 2013 11:25:14 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Linaro Patches <patches@...aro.org>,
	Olof Johansson <olof@...om.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	linaro-acpi@...ts.linaro.org, linux-acpi@...r.kernel.org,
	Amit Daniel Kachhap <amit.daniel@...sung.com>,
	Grant Likely <grant.likely@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC part2 PATCH 7/9] irqdomain: Add a new API irq_create_acpi_mapping()

On Tue, Dec 3, 2013 at 10:39 AM, Hanjun Guo <hanjun.guo@...aro.org> wrote:
> From: Amit Daniel Kachhap <amit.daniel@...sung.com>
>
> This patch introduces a new API for acpi based irq mapping.
>
> [hanjun: Rework this patch to delete the reference to
> gic_irq_domain_xlate() which can simplify the code a lot.]
>
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
>  include/linux/acpi.h   |    2 ++
>  kernel/irq/irqdomain.c |   27 +++++++++++++++++++++++++++
>  2 files changed, 29 insertions(+)
>
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 1e6a0ac..edd5806 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -141,6 +141,8 @@ int acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu);
>  int acpi_unmap_lsapic(int cpu);
>  #endif /* CONFIG_ACPI_HOTPLUG_CPU */
>
> +unsigned int irq_create_acpi_mapping(irq_hw_number_t hwirq,
> +                                        unsigned int type);
>  int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
>  int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base);
>  void acpi_irq_stats_init(void);
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index cf68bb3..c661552 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -501,6 +501,33 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
>  }
>  EXPORT_SYMBOL_GPL(irq_create_of_mapping);
>
> +#ifdef CONFIG_ACPI
> +unsigned int irq_create_acpi_mapping(irq_hw_number_t hwirq,
> +                                       unsigned int type)
> +{
> +       struct irq_domain *domain;
> +       unsigned int virq;
> +
> +       domain = irq_default_domain;
> +       if (!domain) {
> +               pr_warn("no irq domain found !\n");
> +               return 0;
> +       }
> +
> +       /* Create mapping */
> +       virq = irq_create_mapping(domain, hwirq);
> +       if (!virq)
> +               return virq;
> +
> +       /* Set type if specified and different than the current one */
> +       if (type != IRQ_TYPE_NONE &&
> +           type != irq_get_trigger_type(virq))
> +               irq_set_irq_type(virq, type);
> +       return virq;
> +}
> +EXPORT_SYMBOL_GPL(irq_create_acpi_mapping);

There is nothing ACPI specific about this function. This is simply
irq_create_of_mapping w/o translating of_phandle_args to a hwirq and
type. So I expect the code to be re-factored here to mirror that.

Rob
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