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 10:04:57 -0500
From:   Agustin Vega-Frias <agustinv@...eaurora.org>
To:     Hanjun Guo <guohanjun@...wei.com>
Cc:     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, 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

Hi Hanjun,

On 2017-01-17 07:15, Hanjun Guo wrote:
> 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;

Agreed. I'll add the check.

Thanks,
Agustin

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