perf/x86/intel: Add Tremont Topdown support (c2208046) · Commits · 戴 / test

Tremont has four L1 Topdown events, TOPDOWN_FE_BOUND.ALL, TOPDOWN_BAD_SPECULATION.ALL, TOPDOWN_BE_BOUND.ALL and TOPDOWN_RETIRING.ALL. They are available on GP counters. Export them to sysfs and facilitate the perf stat tool. $perf stat --topdown -- sleep 1 Performance counter stats for 'sleep 1': retiring bad speculation frontend bound backend bound 24.9% 16.8% 31.7% 26.6% 1.001224610 seconds time elapsed 0.001150000 seconds user 0.000000000 seconds sys Signed-off-by:

Kan Liang <kan.liang@linux.intel.com> Signed-off-by:

Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/1607457952-3519-1-git-send-email-kan.liang@linux.intel.com

arch/x86/events/intel/core.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -1901,6 +1901,19 @@ static __initconst const u64 tnt_hw_cache_extra_regs
		},
		};

		EVENT_ATTR_STR(topdown-fe-bound, td_fe_bound_tnt, "event=0x71,umask=0x0");
		EVENT_ATTR_STR(topdown-retiring, td_retiring_tnt, "event=0xc2,umask=0x0");
		EVENT_ATTR_STR(topdown-bad-spec, td_bad_spec_tnt, "event=0x73,umask=0x6");
		EVENT_ATTR_STR(topdown-be-bound, td_be_bound_tnt, "event=0x74,umask=0x0");

		static struct attribute *tnt_events_attrs[] = {
		EVENT_PTR(td_fe_bound_tnt),
		EVENT_PTR(td_retiring_tnt),
		EVENT_PTR(td_bad_spec_tnt),
		EVENT_PTR(td_be_bound_tnt),
		NULL,
		};

		static struct extra_reg intel_tnt_extra_regs[] __read_mostly = {
		/* must define OFFCORE_RSP_X first, see intel_fixup_er() */
		INTEL_UEVENT_EXTRA_REG(0x01b7, MSR_OFFCORE_RSP_0, 0x800ff0ffffff9fffull, RSP_0),
		@@ -5174,6 +5187,7 @@ __init int intel_pmu_init(void)
		x86_pmu.lbr_pt_coexist = true;
		x86_pmu.flags \|= PMU_FL_HAS_RSP_1;
		x86_pmu.get_event_constraints = tnt_get_event_constraints;
		td_attr = tnt_events_attrs;
		extra_attr = slm_format_attr;
		pr_cont("Tremont events, ");
		name = "Tremont";

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