linux-kernel - Re: [RESEND PATCH 07/12] perf/x86/intel: Support Perfmon MSRs aliasing

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Message-ID: <20240620080224.GT31592@noisy.programming.kicks-ass.net>
Date: Thu, 20 Jun 2024 10:02:24 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: kan.liang@...ux.intel.com
Cc: mingo@...nel.org, acme@...nel.org, namhyung@...nel.org,
	irogers@...gle.com, adrian.hunter@...el.com,
	alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org,
	ak@...ux.intel.com, eranian@...gle.com
Subject: Re: [RESEND PATCH 07/12] perf/x86/intel: Support Perfmon MSRs
 aliasing

On Tue, Jun 18, 2024 at 08:10:39AM -0700, kan.liang@...ux.intel.com wrote:
> @@ -6179,6 +6181,11 @@ static void intel_pmu_check_extra_regs(struct extra_reg *extra_regs)
>  	}
>  }
>  
> +static inline int intel_pmu_addr_offset(int index, bool eventsel)
> +{
> +	return MSR_IA32_PMC_STEP * index;
> +}

This should have v6 in the name or somesuch... no?

>  static const struct { enum hybrid_pmu_type id; char *name; } intel_hybrid_pmu_type_map[] __initconst = {
>  	{ hybrid_small, "cpu_atom" },
>  	{ hybrid_big, "cpu_core" },
> @@ -7153,6 +7160,14 @@ __init int intel_pmu_init(void)
>  		pr_cont("full-width counters, ");
>  	}
>  
> +	/* Support V6+ MSR Aliasing */
> +	if (x86_pmu.version >= 6) {
> +		x86_pmu.perfctr = MSR_IA32_PMC_GP0_CTR;
> +		x86_pmu.eventsel = MSR_IA32_PMC_GP0_CFG_A;
> +		x86_pmu.fixedctr = MSR_IA32_PMC_FX0_CTR;
> +		x86_pmu.addr_offset = intel_pmu_addr_offset;
> +	}