linux-kernel - Re: [Resend PATCH 2/5] ACPI/Resource: Add address translation support

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Message-ID: <525F5532.7060209@intel.com>
Date:	Thu, 17 Oct 2013 11:10:42 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	lenb@...nel.org, rjw@...k.pl, yinghai@...nel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Resend PATCH 2/5] ACPI/Resource: Add address translation support

On 2013年10月17日 07:05, Bjorn Helgaas wrote:
> On Fri, Oct 11, 2013 at 08:18:58PM +0800, tianyu.lan@...el.com wrote:
>> From: Lan Tianyu <tianyu.lan@...el.com>
>>
>> According ACPI 5.0 spec Section 19.1.8
> 
> This section reference is wrong.  Table 5-133 (on page 243) does
> point to Section 19.1.8, but that section is only the ASL grammar
> description and doesn't have any useful information about what
> _TRA means.
> 
> A more useful reference (and the source of the quote below) is
> Section 6.4.3.5.1.
> 
>> "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."
> 
> You didn't quote this correctly.  Here's a copy/paste from the spec:
> 
>     For bridges that 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 for all Address Translation offset bits.
> 
>> 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>
> 
> I like the patch, though :)  With the above corrections,

Hi Bjorn:
	Thanks for review. I will correct them.

> 
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.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) {
>> -- 
>> 1.8.2.1
>>


-- 
Best regards
Tianyu Lan
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