[PATCH v1 1/2] x86/perf: Only show format attributes when supported

[Andi Kleen]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

Only show the Intel format attributes in sysfs when the feature is actually
supported with the current model numbers. This allows programs to probe
what format attributes are available, and give a sensible error message
to users if they are not.

This handles near all cases for intel attributes since Nehalem,
except the (obscure) case when the model number if known, but PEBS
is disabled in PERF_CAPABILITIES.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
 arch/x86/events/intel/core.c | 48 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 41 insertions(+), 7 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 98b0f0729527..82faeed30135 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3415,12 +3415,26 @@ static struct attribute *intel_arch3_formats_attr[] = {
 	&format_attr_any.attr,
 	&format_attr_inv.attr,
 	&format_attr_cmask.attr,
+	NULL,
+};
+
+static struct attribute *hsw_format_attr[] = {
 	&format_attr_in_tx.attr,
 	&format_attr_in_tx_cp.attr,
+	&format_attr_offcore_rsp.attr,
+	&format_attr_ldlat.attr,
+	NULL
+};
 
-	&format_attr_offcore_rsp.attr, /* XXX do NHM/WSM + SNB breakout */
-	&format_attr_ldlat.attr, /* PEBS load latency */
-	NULL,
+static struct attribute *nhm_format_attr[] = {
+	&format_attr_offcore_rsp.attr,
+	&format_attr_ldlat.attr,
+	NULL
+};
+
+static struct attribute *slm_format_attr[] = {
+	&format_attr_offcore_rsp.attr,
+	NULL
 };
 
 static struct attribute *skl_format_attr[] = {
@@ -3795,6 +3809,7 @@ __init int intel_pmu_init(void)
 	unsigned int unused;
 	struct extra_reg *er;
 	int version, i;
+	struct attribute **extra_attr = NULL;
 
 	if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
 		switch (boot_cpu_data.x86) {
@@ -3905,6 +3920,7 @@ __init int intel_pmu_init(void)
 
 		intel_pmu_pebs_data_source_nhm();
 		x86_add_quirk(intel_nehalem_quirk);
+		extra_attr = nhm_format_attr;
 
 		pr_cont("Nehalem events, ");
 		break;
@@ -3940,6 +3956,7 @@ __init int intel_pmu_init(void)
 		x86_pmu.extra_regs = intel_slm_extra_regs;
 		x86_pmu.flags |= PMU_FL_HAS_RSP_1;
 		x86_pmu.cpu_events = slm_events_attrs;
+		extra_attr = slm_format_attr;
 		pr_cont("Silvermont events, ");
 		break;
 
@@ -3965,6 +3982,7 @@ __init int intel_pmu_init(void)
 		x86_pmu.lbr_pt_coexist = true;
 		x86_pmu.flags |= PMU_FL_HAS_RSP_1;
 		x86_pmu.cpu_events = glm_events_attrs;
+		extra_attr = slm_format_attr;
 		pr_cont("Goldmont events, ");
 		break;
 
@@ -3991,6 +4009,7 @@ __init int intel_pmu_init(void)
 		x86_pmu.cpu_events = glm_events_attrs;
 		/* Goldmont Plus has 4-wide pipeline */
 		event_attr_td_total_slots_scale_glm.event_str = "4";
+		extra_attr = slm_format_attr;
 		pr_cont("Goldmont plus events, ");
 		break;
 
@@ -4020,6 +4039,7 @@ __init int intel_pmu_init(void)
 			X86_CONFIG(.event=0xb1, .umask=0x3f, .inv=1, .cmask=1);
 
 		intel_pmu_pebs_data_source_nhm();
+		extra_attr = nhm_format_attr;
 		pr_cont("Westmere events, ");
 		break;
 
@@ -4056,6 +4076,8 @@ __init int intel_pmu_init(void)
 		intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =
 			X86_CONFIG(.event=0xb1, .umask=0x01, .inv=1, .cmask=1);
 
+		extra_attr = nhm_format_attr;
+
 		pr_cont("SandyBridge events, ");
 		break;
 
@@ -4090,6 +4112,8 @@ __init int intel_pmu_init(void)
 		intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
 			X86_CONFIG(.event=0x0e, .umask=0x01, .inv=1, .cmask=1);
 
+		extra_attr = nhm_format_attr;
+
 		pr_cont("IvyBridge events, ");
 		break;
 
@@ -4118,6 +4142,8 @@ __init int intel_pmu_init(void)
 		x86_pmu.get_event_constraints = hsw_get_event_constraints;
 		x86_pmu.cpu_events = hsw_events_attrs;
 		x86_pmu.lbr_double_abort = true;
+		extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
+			hsw_format_attr : nhm_format_attr;
 		pr_cont("Haswell events, ");
 		break;
 
@@ -4154,6 +4180,8 @@ __init int intel_pmu_init(void)
 		x86_pmu.get_event_constraints = hsw_get_event_constraints;
 		x86_pmu.cpu_events = hsw_events_attrs;
 		x86_pmu.limit_period = bdw_limit_period;
+		extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
+			hsw_format_attr : nhm_format_attr;
 		pr_cont("Broadwell events, ");
 		break;
 
@@ -4172,7 +4200,7 @@ __init int intel_pmu_init(void)
 		/* all extra regs are per-cpu when HT is on */
 		x86_pmu.flags |= PMU_FL_HAS_RSP_1;
 		x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
-
+		extra_attr = slm_format_attr;
 		pr_cont("Knights Landing/Mill events, ");
 		break;
 
@@ -4203,9 +4231,9 @@ __init int intel_pmu_init(void)
 
 		x86_pmu.hw_config = hsw_hw_config;
 		x86_pmu.get_event_constraints = hsw_get_event_constraints;
-		x86_pmu.format_attrs = merge_attr(intel_arch3_formats_attr,
-						  skl_format_attr);
-		WARN_ON(!x86_pmu.format_attrs);
+		extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
+			hsw_format_attr : nhm_format_attr;
+		extra_attr = merge_attr(extra_attr, skl_format_attr);
 		x86_pmu.cpu_events = hsw_events_attrs;
 		pr_cont("Skylake events, ");
 		break;
@@ -4226,6 +4254,12 @@ __init int intel_pmu_init(void)
 		}
 	}
 
+	if (version >= 2 && extra_attr) {
+		x86_pmu.format_attrs = merge_attr(intel_arch3_formats_attr,
+						  extra_attr);
+		WARN_ON(!x86_pmu.format_attrs);
+	}
+
 	if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
 		WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
 		     x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
-- 
2.9.4