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perf/x86-ibs: Catch spurious interrupts after stopping IBS

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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>
This commit is contained in:
Robert Richter 2012-04-02 20:19:17 +02:00 committed by Ingo Molnar
parent c9574fe0bd
commit fc5fb2b5e1
1 changed files with 7 additions and 5 deletions
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12
arch/x86/kernel/cpu/perf_event_amd_ibs.c
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@ -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;