On Thu, Feb 02, 2017 at 06:23:57PM -0500, 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.
>
> Acked-by: Rafael J. Wysocki <raf...@kernel.org>
> Signed-off-by: Agustin Vega-Frias <agust...@codeaurora.org>
> ---
> drivers/acpi/resource.c | 18 +++++++++++++++++-
> 1 file changed, 17 insertions(+), 1 deletion(-)
Acked-by: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index cb57962..8b11d6d 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
>
> +#if IS_ENABLED(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;
> --
> Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm
> Technologies, Inc.
> Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux
> Foundation Collaborative Project.
>
