linux-kernel - Re: [PATCH v2 3/7] genirq: irqdomain: Add irq_create_acpi

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Date:	Fri, 24 Jul 2015 17:14:12 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Marc Zyngier <marc.zyngier@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>
CC:	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Graeme Gregory <graeme@...a.org.uk>
Subject: Re: [PATCH v2 3/7] genirq: irqdomain: Add irq_create_acpi_mapping

On 07/23/2015 09:05 PM, Marc Zyngier wrote:
> In order to help ACPI on arm64 to make use of most of the irqdomain
> goodies, add a new entry point (irq_create_acpi_mapping) which
> mimics irq_create_of_mapping, except that it takes a new
> struct acpi_gsi_descriptor, which is the pendent of of_phandle_args
> in the OF world.
>
> We assume that the way the acpi_gsi_descriptor is populated matches
> that of of_phandle_args, as the latter is still the building block
> for interrupt descriptor in the whole kernel.
>
> Eventually, these two representations should be merged in a single
> structure, but that's probably for another day.

...

>
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>   include/linux/acpi.h   |  9 +++++++++
>   kernel/irq/irqdomain.c | 18 ++++++++++++++++++
>   2 files changed, 27 insertions(+)
>
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index d2445fa..2f23ab0 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -205,6 +205,15 @@ int acpi_register_gsi (struct device *dev, u32 gsi, int triggering, int polarity
>   int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
>   int acpi_isa_irq_to_gsi (unsigned isa_irq, u32 *gsi);
>
> +#define MAX_GSI_DESC_PARAMS 16
> +struct acpi_gsi_descriptor {
> +	int param_count;
> +	u32 param[MAX_GSI_DESC_PARAMS];
> +};
> +
> +unsigned int irq_create_acpi_mapping(struct irq_domain *d,
> +				     struct acpi_gsi_descriptor *irq_data);
> +
>   #ifdef CONFIG_X86_IO_APIC
>   extern int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
>   #else
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 27f4ec7..542cda3 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -1,5 +1,6 @@
>   #define pr_fmt(fmt)  "irq: " fmt
>
> +#include <linux/acpi.h>
>   #include <linux/debugfs.h>
>   #include <linux/hardirq.h>
>   #include <linux/interrupt.h>
> @@ -557,6 +558,23 @@ 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(struct irq_domain *d,
> +				     struct acpi_gsi_descriptor *irq_data)
> +{
> +	struct of_phandle_args args;
> +	int i;
> +
> +	for (i = 0; i < min(irq_data->param_count, MAX_PHANDLE_ARGS); i++)
> +		args.args[i] = irq_data->param[i];
> +
> +	args.np = d ? d->domain_token : NULL;
> +	args.args_count = i;
> +
> +	return irq_create_of_mapping(&args);
> +}

A little bit of hack to me :) , but I agree it's the first step to
merge them in a single structure,

Reviewed-by: Hanjun Guo <hanjun.guo@...aro.org>

Thanks
Hanjun
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