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[tip:perf/core] perf/x86/intel/uncore: Clear all hardware state on exit

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  [tip:perf/core] perf/x86/intel/uncore: Clear all hardware state on  exit tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-02-29 12:10 +0100

#1345656 — [tip:perf/core] perf/x86/intel/uncore: Clear all hardware state on exit

Commit-ID:  7b672d6433f0f31c95be74b649090cd8b3a6388d
Gitweb:     http://git.kernel.org/tip/7b672d6433f0f31c95be74b649090cd8b3a6388d
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Mon, 22 Feb 2016 22:19:17 +0000
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 29 Feb 2016 09:35:19 +0100

perf/x86/intel/uncore: Clear all hardware state on exit

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Harish Chegondi <harish.chegondi@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/20160222221011.702452407@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/events/intel/uncore.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 096fc0d..5ad8e52 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -754,6 +754,30 @@ static void uncore_pmu_unregister(struct intel_uncore_pmu *pmu)
 	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;
@@ -1376,6 +1400,8 @@ 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();

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