linux-kernel - Re: [PATCH V9 1/3] ACPI: Generic GSI: Do not attempt to map non-GSI IRQs during bus scan

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Date:   Tue, 17 Jan 2017 20:15:19 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Agustin Vega-Frias <agustinv@...eaurora.org>,
        <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <rjw@...ysocki.net>,
        <lenb@...nel.org>, <tglx@...utronix.de>, <jason@...edaemon.net>,
        <marc.zyngier@....com>
CC:     <lorenzo.pieralisi@....com>, <timur@...eaurora.org>,
        <cov@...eaurora.org>, <agross@...eaurora.org>,
        <harba@...eaurora.org>, <jcm@...hat.com>, <msalter@...hat.com>,
        <mlangsdo@...hat.com>, <ahs3@...hat.com>, <astone@...hat.com>,
        <graeme.gregory@...aro.org>, <charles.garcia-tobin@....com>
Subject: Re: [PATCH V9 1/3] ACPI: Generic GSI: Do not attempt to map non-GSI
 IRQs during bus scan

On 2016/12/15 6:10, Agustin Vega-Frias wrote:
> ACPI extended IRQ resources may contain a Resource Source field to specify
> an alternate interrupt controller, attempting to map them as GSIs is
> incorrect, so just disable the platform resource.
>
> Since this field is currently ignored, we make this change conditional
> on CONFIG_ACPI_GENERIC_GSI to keep the current behavior on x86 platforms,
> in case some existing ACPI tables are using this incorrectly.
>
> Signed-off-by: Agustin Vega-Frias <agustinv@...eaurora.org>
> ---
>  drivers/acpi/resource.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index 56241eb..76ca4e9 100644
> --- a/drivers/acpi/resource.c
> +++ b/drivers/acpi/resource.c
> @@ -43,6 +43,18 @@ static inline bool acpi_iospace_resource_valid(struct resource *res)
>  acpi_iospace_resource_valid(struct resource *res) { return true; }
>  #endif
>  
> +#ifdef CONFIG_ACPI_GENERIC_GSI
> +static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
> +{
> +	return ext_irq->resource_source.string_length == 0;

As pointed out by Lorenzo, if the interrupt resource is a Resource Producer,
it's not GSI, so maybe the code needs to be updated as

-   return ext_irq->resource_source.string_length == 0;
+ return ext_irq->resource_source.string_length == 0 &&
+        ext_irq->producer_consumer != ACPI_PRODUCER;

Thanks
Hanjun