perf/x86/intel: Hide TSX events when RTM is not supported

0day testing reported a perf test regression on Haswell systems without
RTM. Commit a5df70c3 hides the in_tx/in_tx_cp attributes when RTM is not
available, but the TSX events are still available in sysfs. Due to the
missing attributes the event parser fails on those files.

Don't show the TSX events in sysfs when RTM is not available on
Haswell/Broadwell/Skylake.

Fixes: a5df70c3 (perf/x86: Only show format attributes when supported)
Reported-by: Nkernel test robot <xiaolong.ye@intel.com>
Tested-by: NJin Yao <yao.jin@linux.intel.com>
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Acked-by: NPeter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20171109000718.14137-1-andi@firstfloor.org

arch/x86/events/intel/core.c

@@ -3730,6 +3730,19 @@ EVENT_ATTR_STR(cycles-t,	cycles_t,	"event=0x3c,in_tx=1");
 EVENT_ATTR_STR(cycles-ct,	cycles_ct,	"event=0x3c,in_tx=1,in_tx_cp=1");
 
 static struct attribute *hsw_events_attrs[] = {
+	EVENT_PTR(mem_ld_hsw),
+	EVENT_PTR(mem_st_hsw),
+	EVENT_PTR(td_slots_issued),
+	EVENT_PTR(td_slots_retired),
+	EVENT_PTR(td_fetch_bubbles),
+	EVENT_PTR(td_total_slots),
+	EVENT_PTR(td_total_slots_scale),
+	EVENT_PTR(td_recovery_bubbles),
+	EVENT_PTR(td_recovery_bubbles_scale),
+	NULL
+};
+
+static struct attribute *hsw_tsx_events_attrs[] = {
 	EVENT_PTR(tx_start),
 	EVENT_PTR(tx_commit),
 	EVENT_PTR(tx_abort),
@@ -3742,18 +3755,16 @@ static struct attribute *hsw_events_attrs[] = {
 	EVENT_PTR(el_conflict),
 	EVENT_PTR(cycles_t),
 	EVENT_PTR(cycles_ct),
-	EVENT_PTR(mem_ld_hsw),
-	EVENT_PTR(mem_st_hsw),
-	EVENT_PTR(td_slots_issued),
-	EVENT_PTR(td_slots_retired),
-	EVENT_PTR(td_fetch_bubbles),
-	EVENT_PTR(td_total_slots),
-	EVENT_PTR(td_total_slots_scale),
-	EVENT_PTR(td_recovery_bubbles),
-	EVENT_PTR(td_recovery_bubbles_scale),
 	NULL
 };
 
+static __init struct attribute **get_hsw_events_attrs(void)
+{
+	return boot_cpu_has(X86_FEATURE_RTM) ?
+		merge_attr(hsw_events_attrs, hsw_tsx_events_attrs) :
+		hsw_events_attrs;
+}
+
 static ssize_t freeze_on_smi_show(struct device *cdev,
 				  struct device_attribute *attr,
 				  char *buf)
@@ -4182,7 +4193,7 @@ __init int intel_pmu_init(void)
 
 		x86_pmu.hw_config = hsw_hw_config;
 		x86_pmu.get_event_constraints = hsw_get_event_constraints;
-		x86_pmu.cpu_events = hsw_events_attrs;
+		x86_pmu.cpu_events = get_hsw_events_attrs();
 		x86_pmu.lbr_double_abort = true;
 		extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
 			hsw_format_attr : nhm_format_attr;
@@ -4221,7 +4232,7 @@ __init int intel_pmu_init(void)
 
 		x86_pmu.hw_config = hsw_hw_config;
 		x86_pmu.get_event_constraints = hsw_get_event_constraints;
-		x86_pmu.cpu_events = hsw_events_attrs;
+		x86_pmu.cpu_events = get_hsw_events_attrs();
 		x86_pmu.limit_period = bdw_limit_period;
 		extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
 			hsw_format_attr : nhm_format_attr;
@@ -4279,7 +4290,7 @@ __init int intel_pmu_init(void)
 		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;
+		x86_pmu.cpu_events = get_hsw_events_attrs();
 		intel_pmu_pebs_data_source_skl(
 			boot_cpu_data.x86_model == INTEL_FAM6_SKYLAKE_X);
 		pr_cont("Skylake events, ");