linux-kernel - Re: [RFC Patch 15/19] ACPI: Add field offset to struct resource_list

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Date:	Wed, 21 Jan 2015 13:37:40 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>, Len Brown <lenb@...nel.org>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [RFC Patch 15/19] ACPI: Add field offset to struct resource_list_entry

On 2015/1/21 8:53, Rafael J. Wysocki wrote:
> On Thursday, January 08, 2015 10:33:02 AM Jiang Liu wrote:
>> Add field offset to struct resource_list_entry to host address space
>> translation offset so it could be used to represent bridge resources.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
>> ---
>>  drivers/acpi/resource.c |   13 ++++++++-----
>>  include/linux/acpi.h    |    1 +
>>  2 files changed, 9 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
>> index 16d334a1ee25..54204ac94f8e 100644
>> --- a/drivers/acpi/resource.c
>> +++ b/drivers/acpi/resource.c
>> @@ -462,7 +462,8 @@ struct res_proc_context {
>>  };
>>  
>>  static acpi_status acpi_dev_new_resource_entry(struct resource *r,
>> -					       struct res_proc_context *c)
>> +					       struct res_proc_context *c,
>> +					       resource_size_t offset)
>>  {
>>  	struct resource_list_entry *rentry;
>>  
>> @@ -472,6 +473,7 @@ static acpi_status acpi_dev_new_resource_entry(struct resource *r,
>>  		return AE_NO_MEMORY;
>>  	}
>>  	rentry->res = *r;
>> +	rentry->offset = offset;
>>  	list_add_tail(&rentry->node, c->list);
>>  	c->count++;
>>  	return AE_OK;
>> @@ -480,6 +482,7 @@ static acpi_status acpi_dev_new_resource_entry(struct resource *r,
>>  static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
>>  					     void *context)
>>  {
>> +	resource_size_t offset = 0;
>>  	struct res_proc_context *c = context;
>>  	struct resource r;
>>  	int i;
>> @@ -500,14 +503,14 @@ static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
>>  
>>  	if (acpi_dev_resource_memory(ares, &r)
>>  	    || acpi_dev_resource_io(ares, &r)
>> -	    || acpi_dev_resource_address_space(ares, &r, NULL)
>> -	    || acpi_dev_resource_ext_address_space(ares, &r, NULL))
>> -		return acpi_dev_new_resource_entry(&r, c);
>> +	    || acpi_dev_resource_address_space(ares, &r, &offset)
>> +	    || acpi_dev_resource_ext_address_space(ares, &r, &offset))
>> +		return acpi_dev_new_resource_entry(&r, c, offset);
>>  
>>  	for (i = 0; acpi_dev_resource_interrupt(ares, i, &r); i++) {
>>  		acpi_status status;
>>  
>> -		status = acpi_dev_new_resource_entry(&r, c);
>> +		status = acpi_dev_new_resource_entry(&r, c, 0);
>>  		if (ACPI_FAILURE(status))
>>  			return status;
>>  	}
>> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
>> index bde8119f5897..fea78e772450 100644
>> --- a/include/linux/acpi.h
>> +++ b/include/linux/acpi.h
>> @@ -300,6 +300,7 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
>>  struct resource_list_entry {
>>  	struct list_head node;
>>  	struct resource res;
>> +	resource_size_t offset;
> 
> Well, so instead of adding the offset thing here and there, wouldn't it be
> cleaner to introduce something like
> 
> 	struct ext_resource {
> 		sturct resource res;
> 		resource_size_t offset;
> 	};
> 
> and use struct ext_resource instead of struct resource where an offset is needed?
> 
> Just a thought ...
Hi Rafael,
	Following patches will achieve this by sharing struct resource_list_entry.
Regards!
Gerry
> 
>>  };
>>  
>>  void acpi_dev_free_resource_list(struct list_head *list);
>>
> 
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