linux-kernel - Re: [PATCH] ACPI/IORT: Fix PMCG node always look for a single ID mapping.

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Message-Id: <7A334798-5657-4E43-AF81-C8853D248744@amperemail.onmicrosoft.com>
Date:   Tue, 12 May 2020 16:53:01 -0700
From:   Tuan Phan <tuanphan@...eremail.onmicrosoft.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Tuan Phan <tuanphan@...amperecomputing.com>,
        patches@...erecomputing.com, Hanjun Guo <guohanjun@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI/IORT: Fix PMCG node always look for a single ID
 mapping.



> On May 12, 2020, at 3:40 AM, Lorenzo Pieralisi <lorenzo.pieralisi@....com> wrote:
> 
> On Mon, May 11, 2020 at 01:22:56PM -0700, Tuan Phan wrote:
>> PMCG node can have zero ID mapping if its overflow interrupt
>> is wire based. The code to parse PMCG node can not assume it will
>> have a single ID mapping.
>> 
>> Signed-off-by: Tuan Phan <tuanphan@...amperecomputing.com>
>> ---
>> drivers/acpi/arm64/iort.c | 4 +++-
>> 1 file changed, 3 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
>> index ed3d2d1..72444e1 100644
>> --- a/drivers/acpi/arm64/iort.c
>> +++ b/drivers/acpi/arm64/iort.c
>> @@ -441,7 +441,9 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node)
>> 
>> 		return smmu->id_mapping_index;
>> 	case ACPI_IORT_NODE_PMCG:
>> -		return 0;
>> +		if (node->mapping_count)
>> +			return 0;
> 
> Check struct acpi_iort_pmcg->overflow_gsiv to be coherent with SMMUv3
> code.
> 
> Lorenzo

Sure, I will fix it.
> 
>> +		return -EINVAL;
>> 	default:
>> 		return -EINVAL;
>> 	}
>> -- 
>> 2.7.4
>>