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hwtracing: hisi_ptt: Handle the interrupt in hardirq context
[ Upstream commite0dd27ad8a
] Handle the trace interrupt in the hardirq context, make sure the irq core won't threaded it by declaring IRQF_NO_THREAD and userspace won't balance it by declaring IRQF_NOBALANCING. Otherwise we may violate the synchronization requirements of the perf core, referenced to the change of arm-ccn PMU commit0811ef7e2f
("bus: arm-ccn: fix PMU interrupt flags"). In the interrupt handler we mainly doing 2 things: - Copy the data from the local DMA buffer to the AUX buffer - Commit the data in the AUX buffer Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> [ Fixed commit description to suppress checkpatch warning ] Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20231010084731.30450-3-yangyicong@huawei.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 3 additions and 3 deletions
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@ -342,9 +342,9 @@ static int hisi_ptt_register_irq(struct hisi_ptt *hisi_ptt)
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return ret;
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hisi_ptt->trace_irq = pci_irq_vector(pdev, HISI_PTT_TRACE_DMA_IRQ);
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ret = devm_request_threaded_irq(&pdev->dev, hisi_ptt->trace_irq,
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NULL, hisi_ptt_isr, 0,
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DRV_NAME, hisi_ptt);
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ret = devm_request_irq(&pdev->dev, hisi_ptt->trace_irq, hisi_ptt_isr,
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IRQF_NOBALANCING | IRQF_NO_THREAD, DRV_NAME,
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hisi_ptt);
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if (ret) {
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pci_err(pdev, "failed to request irq %d, ret = %d\n",
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hisi_ptt->trace_irq, ret);
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