perf/x86/amd/iommu: Do not register a task ctx for uncore like PMUs

Peter Zijlstra · Ingo Molnar · commit 8482716b9d86 · 2016-05-05T10:11:28.000+02:00
The new sanity check introduced by: 2665784 ("perf/core: Verify we have a single perf_hw_context PMU") ... triggered on the AMD IOMMU driver. IOMMUs are not per logical CPU, they cannot have per-task counters. Fix it. Reported-by: Borislav Petkov <bp@alien8.de> Tested-by: Borislav Petkov <bp@suse.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: jroedel@suse.de Cc: suravee.suthikulpanit@amd.com Link: http://lkml.kernel.org/r/20160423224255.GB3430@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/arch/x86/events/amd/iommu.c b/arch/x86/events/amd/iommu.c
@@ -474,6 +474,7 @@ static __init int _init_perf_amd_iommu(
 
 static struct perf_amd_iommu __perf_iommu = {
 	.pmu = {
+		.task_ctx_nr    = perf_invalid_context,
 		.event_init	= perf_iommu_event_init,
 		.add		= perf_iommu_add,
 		.del		= perf_iommu_del,
