Messages in this thread Patch in this message | | | Date | Thu, 5 May 2016 02:44:53 -0700 | From | tip-bot for Peter Zijlstra <> | Subject | [tip:perf/core] perf/x86/amd/iommu: Do not register a task ctx for uncore like PMUs |
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Commit-ID: 8482716b9d865db34c55d4bf2fed19498e7195b9 Gitweb: http://git.kernel.org/tip/8482716b9d865db34c55d4bf2fed19498e7195b9 Author: Peter Zijlstra <peterz@infradead.org> AuthorDate: Sun, 24 Apr 2016 00:42:55 +0200 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Thu, 5 May 2016 10:11:28 +0200
perf/x86/amd/iommu: Do not register a task ctx for uncore like PMUs
The new sanity check introduced by:
26657848502b ("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> --- arch/x86/events/amd/iommu.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/events/amd/iommu.c b/arch/x86/events/amd/iommu.c index 40625ca..6011a57 100644 --- 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,
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