linux-kernel - Re: [PATCH] perf/x86: update Intel Ivy Bridge support

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Date:	Tue, 18 Sep 2012 12:10:55 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [PATCH] perf/x86: update Intel Ivy Bridge support

Any comment on this patch?


On Tue, Sep 11, 2012 at 1:07 AM, Stephane Eranian <eranian@...gle.com> wrote:
>
> This patch updates the existing Intel IvyBridge (model 58)
> support with proper PEBS event constraints. It cannot reuse
> the same as SandyBridge because some events (0xd3) are
> specific to IvyBridge.
>
> Also there is no UOPS_DISPATCHED.THREAD on IVB, so do not
> populate the PERF_COUNT_HW_STALLED_CYCLES_BACKEND mapping.
>
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
>
> diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
> index 6605a81..8b6defe 100644
> --- a/arch/x86/kernel/cpu/perf_event.h
> +++ b/arch/x86/kernel/cpu/perf_event.h
> @@ -586,6 +586,8 @@ extern struct event_constraint intel_westmere_pebs_event_constraints[];
>
>  extern struct event_constraint intel_snb_pebs_event_constraints[];
>
> +extern struct event_constraint intel_ivb_pebs_event_constraints[];
> +
>  struct event_constraint *intel_pebs_constraints(struct perf_event *event);
>
>  void intel_pmu_pebs_enable(struct perf_event *event);
> diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
> index 0d3d63a..6bca492 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -2048,7 +2048,6 @@ __init int intel_pmu_init(void)
>         case 42: /* SandyBridge */
>         case 45: /* SandyBridge, "Romely-EP" */
>                 x86_add_quirk(intel_sandybridge_quirk);
> -       case 58: /* IvyBridge */
>                 memcpy(hw_cache_event_ids, snb_hw_cache_event_ids,
>                        sizeof(hw_cache_event_ids));
>                 memcpy(hw_cache_extra_regs, snb_hw_cache_extra_regs,
> @@ -2073,6 +2072,29 @@ __init int intel_pmu_init(void)
>
>                 pr_cont("SandyBridge events, ");
>                 break;
> +       case 58: /* IvyBridge */
> +               memcpy(hw_cache_event_ids, snb_hw_cache_event_ids,
> +                      sizeof(hw_cache_event_ids));
> +               memcpy(hw_cache_extra_regs, snb_hw_cache_extra_regs,
> +                      sizeof(hw_cache_extra_regs));
> +
> +               intel_pmu_lbr_init_snb();
> +
> +               x86_pmu.event_constraints = intel_snb_event_constraints;
> +               x86_pmu.pebs_constraints = intel_ivb_pebs_event_constraints;
> +               x86_pmu.pebs_aliases = intel_pebs_aliases_snb;
> +               x86_pmu.extra_regs = intel_snb_extra_regs;
> +               /* all extra regs are per-cpu when HT is on */
> +               x86_pmu.er_flags |= ERF_HAS_RSP_1;
> +               x86_pmu.er_flags |= ERF_NO_HT_SHARING;
> +
> +               /* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
> +               intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
> +                       X86_CONFIG(.event=0x0e, .umask=0x01, .inv=1, .cmask=1);
> +
> +               pr_cont("IvyBridge events, ");
> +               break;
> +
>
>         default:
>                 switch (x86_pmu.version) {
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
> index e38d97b..826054a 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
> @@ -407,6 +407,20 @@ struct event_constraint intel_snb_pebs_event_constraints[] = {
>         EVENT_CONSTRAINT_END
>  };
>
> +struct event_constraint intel_ivb_pebs_event_constraints[] = {
> +        INTEL_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */
> +        INTEL_UEVENT_CONSTRAINT(0x01c2, 0xf), /* UOPS_RETIRED.ALL */
> +        INTEL_UEVENT_CONSTRAINT(0x02c2, 0xf), /* UOPS_RETIRED.RETIRE_SLOTS */
> +        INTEL_EVENT_CONSTRAINT(0xc4, 0xf),    /* BR_INST_RETIRED.* */
> +        INTEL_EVENT_CONSTRAINT(0xc5, 0xf),    /* BR_MISP_RETIRED.* */
> +        INTEL_EVENT_CONSTRAINT(0xcd, 0x8),    /* MEM_TRANS_RETIRED.* */
> +        INTEL_EVENT_CONSTRAINT(0xd0, 0xf),    /* MEM_UOP_RETIRED.* */
> +        INTEL_EVENT_CONSTRAINT(0xd1, 0xf),    /* MEM_LOAD_UOPS_RETIRED.* */
> +        INTEL_EVENT_CONSTRAINT(0xd2, 0xf),    /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */
> +        INTEL_EVENT_CONSTRAINT(0xd3, 0xf),    /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */
> +        EVENT_CONSTRAINT_END
> +};
> +
>  struct event_constraint *intel_pebs_constraints(struct perf_event *event)
>  {
>         struct event_constraint *c;
--
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