linux-kernel - Re: [PATCH 2/2] x86/cpu/amd: Enable the fixed intructions retired free counter IRPERF

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Date:   Wed, 15 Jan 2020 20:03:24 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Kim Phillips <kim.phillips@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Babu Moger <babu.moger@....com>,
        Borislav Petkov <bp@...en8.de>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Frank van der Linden <fllinden@...zon.com>,
        "H . Peter Anvin" <hpa@...or.com>, Huang Rui <ray.huang@....com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Jan Beulich <jbeulich@...e.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Luwei Kang <luwei.kang@...el.com>,
        Martin Liška <mliska@...e.cz>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Namhyung Kim <namhyung@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/cpu/amd: Enable the fixed intructions retired
 free counter IRPERF

> +	if (cpu_has(c, X86_FEATURE_IRPERF) &&
> +	    !(c->x86 == 0x17 && c->x86_model <= 0x1f))

Such checks are normally through a x86_pmu lag or possibly a X86_BUG_* flag

> +		msr_set_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT);
>  }
>  
>  #ifdef CONFIG_X86_32
> -- 
> 2.24.1
>