[patch V3 13/28] x86/perf/intel_uncore: Clear all hardware state on exit

[Thomas Gleixner <tglx@linutronix.de>]

[-- Attachment #1: x86-perf-intel_uncore--Clear-all-hardware-state-on-exit.patch --]
[-- Type: text/plain, Size: 1488 bytes --]

The only missing bit is to completely clear the hardware state on failure
exit. This is now a pretty simple exercise.

Undo the box->init_box() setup on all packages which have been initialized so
far.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/kernel/cpu/perf_event_intel_uncore.c |   26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -754,6 +754,30 @@ static void uncore_pmu_unregister(struct
 	pmu->registered = false;
 }
 
+static void __init __uncore_exit_boxes(struct intel_uncore_type *type, int cpu)
+{
+	struct intel_uncore_pmu *pmu = type->pmus;
+	struct intel_uncore_box *box;
+	int i, pkg;
+
+	if (pmu) {
+		pkg = topology_physical_package_id(cpu);
+		for (i = 0; i < type->num_boxes; i++, pmu++) {
+			box = pmu->boxes[pkg];
+			if (box)
+				uncore_box_exit(box);
+		}
+	}
+}
+
+static void __init uncore_exit_boxes(void *dummy)
+{
+	struct intel_uncore_type **types;
+
+	for (types = uncore_msr_uncores; *types; types++)
+		__uncore_exit_boxes(*types++, smp_processor_id());
+}
+
 static void uncore_free_boxes(struct intel_uncore_pmu *pmu)
 {
 	int pkg;
@@ -1371,6 +1395,8 @@ static int __init intel_uncore_init(void
 	return 0;
 
 err:
+	/* Undo box->init_box() */
+	on_each_cpu_mask(&uncore_cpu_mask, uncore_exit_boxes, NULL, 1);
 	uncore_types_exit(uncore_msr_uncores);
 	uncore_pci_exit();
 	cpu_notifier_register_done();