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

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Date:   Mon, 3 Jun 2019 17:47:50 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kan.liang@...ux.intel.com
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 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?

---
--- 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;