linux-kernel - Re: [PATCH V11 1/3] ACPI: Generic GSI: Do not attempt to map non-GSI IRQs during bus scan

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Date:   Tue, 31 Jan 2017 23:00:54 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Agustin Vega-Frias <agustinv@...eaurora.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Timur Tabi <timur@...eaurora.org>,
        Christopher Covington <cov@...eaurora.org>,
        Andy Gross <agross@...eaurora.org>, harba@...eaurora.org,
        Jon Masters <jcm@...hat.com>, Mark Salter <msalter@...hat.com>,
        Mark Langsdorf <mlangsdo@...hat.com>,
        Al Stone <ahs3@...hat.com>, astone@...hat.com,
        Graeme Gregory <graeme.gregory@...aro.org>,
        Hanjun Guo <guohanjun@...wei.com>,
        Charles Garcia Tobin <charles.garcia-tobin@....com>
Subject: Re: [PATCH V11 1/3] ACPI: Generic GSI: Do not attempt to map non-GSI
 IRQs during bus scan

On Fri, Jan 20, 2017 at 3:34 AM, Agustin Vega-Frias
<agustinv@...eaurora.org> 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>

This one is fine by me, so feel free to add my ACK to it.

Or if you want me to apply it, please let me know.

> ---
>  drivers/acpi/resource.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index cb57962..69cd430 100644
> --- a/drivers/acpi/resource.c
> +++ b/drivers/acpi/resource.c
> @@ -43,6 +43,19 @@ 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 &&
> +              ext_irq->producer_consumer == ACPI_CONSUMER;
> +}
> +#else
> +static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq)
> +{
> +       return true;
> +}
> +#endif
> +
>  static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io)
>  {
>         u64 reslen = end - start + 1;
> @@ -470,9 +483,12 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
>                         acpi_dev_irqresource_disabled(res, 0);
>                         return false;
>                 }
> -               acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
> +               if (is_gsi(ext_irq))
> +                       acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
>                                          ext_irq->triggering, ext_irq->polarity,
>                                          ext_irq->sharable, false);
> +               else
> +                       acpi_dev_irqresource_disabled(res, 0);
>                 break;
>         default:
>                 res->flags = 0;
> --

Thanks,
Rafael