linux-kernel - Re: [PATCH 2/3] perf/x86/intel: Add more Icelake CPUIDs

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Date:   Mon, 3 Jun 2019 12:14:49 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...hat.com, bp@...en8.de, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, x86@...nel.org, qiuxu.zhuo@...el.com,
        tony.luck@...el.com, rui.zhang@...el.com
Subject: Re: [PATCH 2/3] perf/x86/intel: Add more Icelake CPUIDs



On 6/3/2019 11:47 AM, Peter Zijlstra wrote:
> On Mon, Jun 03, 2019 at 06:41:21AM -0700, kan.liang@...ux.intel.com wrote:
>> @@ -4962,7 +4965,9 @@ __init int intel_pmu_init(void)
>>   		x86_pmu.cpu_events = get_icl_events_attrs();
>>   		x86_pmu.rtm_abort_event = X86_CONFIG(.event=0xca, .umask=0x02);
>>   		x86_pmu.lbr_pt_coexist = true;
>> -		intel_pmu_pebs_data_source_skl(false);
>> +		intel_pmu_pebs_data_source_skl(
>> +			(boot_cpu_data.x86_model == INTEL_FAM6_ICELAKE_X) ||
>> +			(boot_cpu_data.x86_model == INTEL_FAM6_ICELAKE_XEON_D));
> 
> That's pretty sad, a model switch inside a model switch :/
> 
>>   		pr_cont("Icelake events, ");
>>   		name = "icelake";
>>   		break;
> 
> Would something like so not be nicer?

Yes, it looks better. Thanks.

Should I combine your patch with mine, and send out V2?
Or are you prefer to add your patch on top of this patch set?

Thanks,
Kan

> 
> ---
> --- a/arch/x86/events/intel/core.c
> +++ b/arch/x86/events/intel/core.c
> @@ -4485,6 +4485,7 @@ __init int intel_pmu_init(void)
>   	struct event_constraint *c;
>   	unsigned int unused;
>   	struct extra_reg *er;
> +	bool pmem = false;
>   	int version, i;
>   	char *name;
>   
> @@ -4936,9 +4937,10 @@ __init int intel_pmu_init(void)
>   		name = "knights-landing";
>   		break;
>   
> +	case INTEL_FAM6_SKYLAKE_X:
> +		pmem = true;
>   	case INTEL_FAM6_SKYLAKE_MOBILE:
>   	case INTEL_FAM6_SKYLAKE_DESKTOP:
> -	case INTEL_FAM6_SKYLAKE_X:
>   	case INTEL_FAM6_KABYLAKE_MOBILE:
>   	case INTEL_FAM6_KABYLAKE_DESKTOP:
>   		x86_add_quirk(intel_pebs_isolation_quirk);
> @@ -4970,8 +4972,7 @@ __init int intel_pmu_init(void)
>   		td_attr  = hsw_events_attrs;
>   		mem_attr = hsw_mem_events_attrs;
>   		tsx_attr = hsw_tsx_events_attrs;
> -		intel_pmu_pebs_data_source_skl(
> -			boot_cpu_data.x86_model == INTEL_FAM6_SKYLAKE_X);
> +		intel_pmu_pebs_data_source_skl(pmem);
>   
>   		if (boot_cpu_has(X86_FEATURE_TSX_FORCE_ABORT)) {
>   			x86_pmu.flags |= PMU_FL_TFA;
> @@ -4985,7 +4986,11 @@ __init int intel_pmu_init(void)
>   		name = "skylake";
>   		break;
>   
> +	case INTEL_FAM6_ICELAKE_X:
> +	case INTEL_FAM6_ICELAKE_XEON_D:
> +		pmem = true;
>   	case INTEL_FAM6_ICELAKE_MOBILE:
> +	case INTEL_FAM6_ICELAKE_DESKTOP:
>   		x86_pmu.late_ack = true;
>   		memcpy(hw_cache_event_ids, skl_hw_cache_event_ids, sizeof(hw_cache_event_ids));
>   		memcpy(hw_cache_extra_regs, skl_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));
> @@ -5009,7 +5014,7 @@ __init int intel_pmu_init(void)
>   		tsx_attr = icl_tsx_events_attrs;
>   		x86_pmu.rtm_abort_event = X86_CONFIG(.event=0xca, .umask=0x02);
>   		x86_pmu.lbr_pt_coexist = true;
> -		intel_pmu_pebs_data_source_skl(false);
> +		intel_pmu_pebs_data_source_skl(pmem);
>   		pr_cont("Icelake events, ");
>   		name = "icelake";
>   		break;
>