linux-kernel - Re: [RFC PATCH 2/4] ACPI/Resource: Add address translation support

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Date:	Mon, 09 Sep 2013 10:18:42 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	lenb@...nel.org, yinghai@...nel.org, bhelgaas@...gle.com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/4] ACPI/Resource: Add address translation support

On 2013年09月07日 08:15, Rafael J. Wysocki wrote:
> On Friday, September 06, 2013 10:24:44 AM Lan Tianyu wrote:
>> According ACPI 5.0 spec Section 19.1.8
>> "For bridges, translate addresses across the bridge, this is the
>> offset that must be added to the address on the secondary side
>> to obtain the address on the primary side. Non-bridge devices
>> must list 0."
> 
> Can you please have a look into the previous versions of the spec and double
> check that this change won't confuse systems that implement them?
> 

Hi Rafael:
         I check all versions. This part has existed and not been
changed since ACPI 1.0.

> Otherwise it looks OK to me.
> 
> Thanks,
> Rafael
> 
> 
>> This patch is to add address translation offset to the start/end
>> of struct resource in the acpi_dev_resource_address_space().
>> Further more, non-bridge device's translation_offset should 0.
>> So this change will affect other devices.
>>
>>
>> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
>> ---
>>  drivers/acpi/resource.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
>> index 929f416..84bc3db 100644
>> --- a/drivers/acpi/resource.c
>> +++ b/drivers/acpi/resource.c
>> @@ -192,8 +192,8 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares,
>>  	if (ACPI_FAILURE(status))
>>  		return true;
>>  
>> -	res->start = addr.minimum;
>> -	res->end = addr.maximum;
>> +	res->start = addr.minimum + addr.translation_offset;
>> +	res->end = addr.maximum + addr.translation_offset;
>>  	window = addr.producer_consumer == ACPI_PRODUCER;
>>  
>>  	switch(addr.resource_type) {
>>


-- 
Best regards
Tianyu Lan
--
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