linux-kernel - Re: [PATCH v2 6/7] irqchip: GIC: Switch ACPI support to stacked domains

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Message-ID: <55B20D7F.2050704@linaro.org>
Date:	Fri, 24 Jul 2015 18:03:43 +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 6/7] irqchip: GIC: Switch ACPI support to stacked domains

On 07/23/2015 09:05 PM, Marc Zyngier wrote:
> Now that the basic ACPI GSI code is irq domain aware, make sure
> that the ACPI support in the GIC doesn't pointlessly deviate from
> the DT path.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

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

Thanks
Hanjun

> ---
>   drivers/irqchip/irq-gic.c       | 45 ++++++++++++++++++++++++++++++-----------
>   include/linux/irqchip/arm-gic.h |  2 +-
>   2 files changed, 34 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> index b41ccf5..ce531e6 100644
> --- a/drivers/irqchip/irq-gic.c
> +++ b/drivers/irqchip/irq-gic.c
> @@ -813,8 +813,6 @@ static int gic_irq_domain_xlate(struct irq_domain *d,
>   {
>   	unsigned long ret = 0;
>
> -	if (irq_domain_get_of_node(d) != controller)
> -		return -EINVAL;
>   	if (intsize < 3)
>   		return -EINVAL;
>
> @@ -887,7 +885,7 @@ void gic_set_irqchip_flags(unsigned long flags)
>
>   void __init gic_init_bases(unsigned int gic_nr, int irq_start,
>   			   void __iomem *dist_base, void __iomem *cpu_base,
> -			   u32 percpu_offset, struct device_node *node)
> +			   u32 percpu_offset, void *domain_token)
>   {
>   	irq_hw_number_t hwirq_base;
>   	struct gic_chip_data *gic;
> @@ -946,8 +944,8 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
>   		gic_irqs = 1020;
>   	gic->gic_irqs = gic_irqs;
>
> -	if (node) {		/* DT case */
> -		gic->domain = irq_domain_add_linear(node, gic_irqs,
> +	if (domain_token) {		/* DT/ACPI case */
> +		gic->domain = irq_domain_add_linear(domain_token, gic_irqs,
>   						    &gic_irq_domain_hierarchy_ops,
>   						    gic);
>   	} else {		/* Non-DT case */
> @@ -973,7 +971,7 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
>   			irq_base = irq_start;
>   		}
>
> -		gic->domain = irq_domain_add_legacy(node, gic_irqs, irq_base,
> +		gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
>   					hwirq_base, &gic_irq_domain_ops, gic);
>   	}
>
> @@ -1086,6 +1084,31 @@ gic_acpi_parse_madt_distributor(struct acpi_subtable_header *header,
>   	return 0;
>   }
>
> +static int gic_acpi_gsi_desc_populate(struct acpi_gsi_descriptor *data,
> +				      u32 gsi, unsigned int irq_type)
> +{
> +	/*
> +	 * Encode GSI and triggering information the way the GIC likes
> +	 * them.
> +	 */
> +	if (WARN_ON(gsi < 16))
> +		return -EINVAL;
> +
> +	if (gsi >= 32) {
> +		data->param[0] = 0;		/* SPI */
> +		data->param[1] = gsi - 32;
> +		data->param[2] = irq_type;
> +	} else {
> +		data->param[0] = 1; 		/* PPI */
> +		data->param[1] = gsi - 16;
> +		data->param[2] = 0xff << 4 | irq_type;
> +	}
> +
> +	data->param_count = 3;
> +
> +	return 0;
> +}
> +
>   int __init
>   gic_v2_acpi_init(struct acpi_table_header *table)
>   {
> @@ -1132,14 +1155,12 @@ gic_v2_acpi_init(struct acpi_table_header *table)
>   	}
>
>   	/*
> -	 * Initialize zero GIC instance (no multi-GIC support). Also, set GIC
> -	 * as default IRQ domain to allow for GSI registration and GSI to IRQ
> -	 * number translation (see acpi_register_gsi() and acpi_gsi_to_irq()).
> +	 * Initialize zero GIC instance (no multi-GIC support).
>   	 */
> -	gic_init_bases(0, -1, dist_base, cpu_base, 0, NULL);
> -	irq_set_default_host(gic_data[0].domain);
> +	gic_init_bases(0, -1, dist_base, cpu_base, 0, (void *)ACPI_IRQ_MODEL_GIC);
>
> -	acpi_irq_model = ACPI_IRQ_MODEL_GIC;
> +	acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, ACPI_IRQ_MODEL_GIC,
> +			   gic_acpi_gsi_desc_populate);
>   	return 0;
>   }
>   #endif
> diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
> index 9de976b..97799b7 100644
> --- a/include/linux/irqchip/arm-gic.h
> +++ b/include/linux/irqchip/arm-gic.h
> @@ -97,7 +97,7 @@ struct device_node;
>
>   void gic_set_irqchip_flags(unsigned long flags);
>   void gic_init_bases(unsigned int, int, void __iomem *, void __iomem *,
> -		    u32 offset, struct device_node *);
> +		    u32 offset, void *);
>   void gic_cascade_irq(unsigned int gic_nr, unsigned int irq);
>   void gic_cpu_if_down(void);
>
>
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