linux-kernel - Re: [PATCH 1/1] irqchip/gicv3-its: remove GITS_BASER_TYPE

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Date:	Tue, 7 Apr 2015 10:05:45 +0800
From:	leizhen <thunder.leizhen@...wei.com>
To:	Jason Cooper <jason@...edaemon.net>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <marc.zyngier@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	Tianhong Ding <dingtianhong@...wei.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Yun Wu <wuyun.wu@...wei.com>
Subject: Re: [PATCH 1/1] irqchip/gicv3-its: remove GITS_BASER_TYPE_CPU base
 on latest specification

On 2015/4/3 22:46, Jason Cooper wrote:
> Zhen Lei,
> 
> On Fri, Apr 03, 2015 at 11:33:52AM +0800, Zhen Lei wrote:
>> Acutally, "Interrupt Collections" and "Physical Processors" is the
>> same thing.
> 
> I'm sorry, but this isn't clear.
> 
>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>> ---
>>  drivers/irqchip/irq-gic-v3-its.c   | 2 +-
>>  include/linux/irqchip/arm-gic-v3.h | 2 +-
>>  2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
>> index 9687f8a..a795aae 100644
>> --- a/drivers/irqchip/irq-gic-v3-its.c
>> +++ b/drivers/irqchip/irq-gic-v3-its.c
>> @@ -777,7 +777,7 @@ static int __init its_alloc_lpi_tables(void)
>>  static const char *its_base_type_string[] = {
>>  	[GITS_BASER_TYPE_DEVICE]	= "Devices",
>>  	[GITS_BASER_TYPE_VCPU]		= "Virtual CPUs",
>> -	[GITS_BASER_TYPE_CPU]		= "Physical CPUs",
>> +	[GITS_BASER_TYPE_RESERVED3]	= "Reserved (3)",
> 
> Are you fixing a bug?  Was the old information wrong?  Did the spec get
> revised?

In spec version 19.0, clause 5.12.13 GITS_BASERn. The "Type" field define value=0x3 means:
0x3. Physical Processors. This register corresponds to a table that scales according to the number of physical processors in the system and requires (Entry-size * number-of-processors) bytes of memory.

In spec version 24.0, clause 5.12.13 GITS_BASERn. The "Type" field define value=0x3 as reserved:
0x3. Reserved.

> 
> Please redo your commit message to explain why this change is necessary and
> what it's doing.

OK, thank  you for your advise.

> 
>>  	[GITS_BASER_TYPE_COLLECTION]	= "Interrupt Collections",
>>  	[GITS_BASER_TYPE_RESERVED5] 	= "Reserved (5)",
>>  	[GITS_BASER_TYPE_RESERVED6] 	= "Reserved (6)",
>> diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
>> index ffbc034..67f5779 100644
>> --- a/include/linux/irqchip/arm-gic-v3.h
>> +++ b/include/linux/irqchip/arm-gic-v3.h
>> @@ -233,7 +233,7 @@
>>  #define GITS_BASER_TYPE_NONE		0
>>  #define GITS_BASER_TYPE_DEVICE		1
>>  #define GITS_BASER_TYPE_VCPU		2
>> -#define GITS_BASER_TYPE_CPU		3
>> +#define GITS_BASER_TYPE_RESERVED3	3
>>  #define GITS_BASER_TYPE_COLLECTION	4
>>  #define GITS_BASER_TYPE_RESERVED5	5
>>  #define GITS_BASER_TYPE_RESERVED6	6
>> --
>> 1.8.0
> 
> thx,
> 
> Jason.
> 
> .
> 


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