linux-kernel - Re: [PATCH V6 2/7] perf/amd/iommu: Modify functions to query max banks and counters

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Date:   Mon, 9 Jan 2017 17:48:27 +0700
From:   Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:     Joerg Roedel <joro@...tes.org>
CC:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <bp@...en8.de>, <peterz@...radead.org>, <mingo@...hat.com>
Subject: Re: [PATCH V6 2/7] perf/amd/iommu: Modify functions to query max
 banks and counters



On 1/4/17 21:48, Joerg Roedel wrote:
> On Fri, Dec 23, 2016 at 08:38:45PM +0700, Suravee Suthikulpanit wrote:
>> --- a/arch/x86/events/amd/iommu.h
>> +++ b/arch/x86/events/amd/iommu.h
>> @@ -24,15 +24,12 @@
>>  #define PC_MAX_SPEC_BNKS			64
>>  #define PC_MAX_SPEC_CNTRS			16
>>
>> -/* iommu pc reg masks*/
>> -#define IOMMU_BASE_DEVID			0x0000
>> -
>>  /* amd_iommu_init.c external support functions */
>>  extern bool amd_iommu_pc_supported(void);
>>
>> -extern u8 amd_iommu_pc_get_max_banks(u16 devid);
>> +extern u8 amd_iommu_pc_get_max_banks(uint devid);
>>
>> -extern u8 amd_iommu_pc_get_max_counters(u16 devid);
>> +extern u8 amd_iommu_pc_get_max_counters(uint devid);
>
> The parameters are now iommu-indexes and not device-ids anymore. You
> should reflect that in the prototypes here too.

Ahh.. thanks for pointing out. I missed this part.

>> diff --git a/drivers/iommu/amd_iommu_proto.h b/drivers/iommu/amd_iommu_proto.h
>> index 7eb60c1..1f10b3f 100644
>> --- a/drivers/iommu/amd_iommu_proto.h
>> +++ b/drivers/iommu/amd_iommu_proto.h
>> @@ -58,8 +58,8 @@ extern int amd_iommu_domain_set_gcr3(struct iommu_domain *dom, int pasid,
>>
>>  /* IOMMU Performance Counter functions */
>>  extern bool amd_iommu_pc_supported(void);
>> -extern u8 amd_iommu_pc_get_max_banks(u16 devid);
>> -extern u8 amd_iommu_pc_get_max_counters(u16 devid);
>> +extern u8 amd_iommu_pc_get_max_banks(uint devid);
>> +extern u8 amd_iommu_pc_get_max_counters(uint devid);
>
> Same here, and why do you need to declare the prototypes in two
> different header files?

Hm.. actually good point. I will remove the unnecessary function 
declarations in the amd_iommu_proto.h.

Thanks,
Suravee