Messages in this thread Patch in this message | | | Date | Wed, 9 May 2012 07:38:12 -0700 | From | tip-bot for Robert Richter <> | Subject | [tip:perf/core] perf/x86-ibs: Catch spurious interrupts after stopping IBS |
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Commit-ID: fc5fb2b5e1874e5894e2ac503bfb744220db89a1 Gitweb: http://git.kernel.org/tip/fc5fb2b5e1874e5894e2ac503bfb744220db89a1 Author: Robert Richter <robert.richter@amd.com> AuthorDate: Mon, 2 Apr 2012 20:19:17 +0200 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Wed, 9 May 2012 15:23:16 +0200
perf/x86-ibs: Catch spurious interrupts after stopping IBS
After disabling IBS there could be still incomming NMIs with samples that even have the valid bit cleared. Mark all this NMIs as handled to avoid spurious interrupt messages.
Signed-off-by: Robert Richter <robert.richter@amd.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1333390758-10893-12-git-send-email-robert.richter@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/kernel/cpu/perf_event_amd_ibs.c | 12 +++++++----- 1 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_amd_ibs.c b/arch/x86/kernel/cpu/perf_event_amd_ibs.c index b14e711..5a9f95b 100644 --- a/arch/x86/kernel/cpu/perf_event_amd_ibs.c +++ b/arch/x86/kernel/cpu/perf_event_amd_ibs.c @@ -473,11 +473,13 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs) u64 *buf, *config, period; if (!test_bit(IBS_STARTED, pcpu->state)) { - /* Catch spurious interrupts after stopping IBS: */ - if (!test_and_clear_bit(IBS_STOPPING, pcpu->state)) - return 0; - rdmsrl(perf_ibs->msr, *ibs_data.regs); - return (*ibs_data.regs & perf_ibs->valid_mask) ? 1 : 0; + /* + * Catch spurious interrupts after stopping IBS: After + * disabling IBS there could be still incomming NMIs + * with samples that even have the valid bit cleared. + * Mark all this NMIs as handled. + */ + return test_and_clear_bit(IBS_STOPPING, pcpu->state) ? 1 : 0; } msr = hwc->config_base;
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